This standard specifies the basic concepts, classifications, parameters, geometric characteristics and related terms of main parts and components of rotary compressors. This standard applies to relevant rotary compressors. JB/T 7662-1995 Volumetric Compressor Terminology Rotary Compressor JB/T7662-1995 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 7662-95
Terms of Volumetric Compressors
Rotary Compressors
Published on June 16, 1995
Ministry of Machinery Industry of the People's Republic of China
Implementation on July 1, 1996
Mechanical Industry Standard of the People's Republic of China
Terms of Volumetric Compressors
Rotary Compressors
Subject Content and Scope of Application
JB/T7662-95
This standard specifies the basic concepts, classifications, parameters, geometric characteristics and related terms of main parts and components of rotary compressors. This standard applies to relevant rotary compressors. 2 Basic Concepts
Elementary Volume Volumetric Element
In each motion cycle, the rotor has several identical working volumes that perform the same working process in sequence. This working volume is called the elementary volume.
Passing volume passingvolume
The minimum volume that the elementary volume can reach. At this time, the remaining compressed gas will move from the exhaust port to the suction port, so it is called the passing volume.
Closed volume closedvolume
In a rotary compressor, the rotary motion of the rotor causes the elementary volume to change periodically. When the volume changes to the minimum, it is not yet connected to the suction port or the exhaust port in time, thereby generating a local closed volume that affects normal suction or exhaust. Suction closed volume suctionclosedvolume2.3.11
Suction does not start at the minimum elementary volume, that is, when the minimum volume begins to expand gradually, it is not yet connected to the suction port, thereby generating a local closed volume that affects the normal inflation of the elementary volume. Discharge closed volume dischargeclosedvolume2.3.2
Discharge does not end at the minimum elemental volume, that is, the volume has not yet reached the minimum value, the elemental volume has been disconnected from the exhaust port and the remaining local closed volume.
2.4Internal leakageinternal leakage
Gas leakage between elemental volumes that are not connected to the suction port. External leakageexternalleakage
Gas leakage from elemental volumes during compression or exhaust to the suction port or the atmosphere. 2.6
Terminal clearanceterminalclearance
The clearance between the rotor end face and the inner end face of the casing (cylinder end face) or the end cover. Radial clearanceradialclearance
The clearance between the outer circle of the rotor and the inner circle of the casing (cylinder). Intermeshing clearanceintermeshingclearance2.8
The clearance between the profiles or profiles when the rotor is in the closed state. 2.9 Internal compression internal compression Approved by the Ministry of Machinery Industry on June 16, 1995
Implemented on July 1, 1996
JB/T7662-95
Compression of gas caused by the change of volume in a closed elementary volume. 2.10 Internal pressure ratio internal pressure ratio (built-in pressure ratio) The ratio of the final pressure of the gas in the elementary volume after internal compression to the initial pressure. External pressure ratio external pressure ratio (actual pressure ratio) 2.11
The ratio of the outlet exhaust pressure to the inlet suction pressure of the compressor. Volume ratio volumeratio
The ratio of the volume of the elementary volume at the beginning of internal compression to the minimum value at the end. Eccentrically mounted 2.13
The configuration form in which the axes of the rotor and cylinder of the rotary compressor do not coincide but keep a certain distance. 2.14
Profilerotaryhelicoid
The twisted helical tooth surface of the female and male screws of the screw compressor is collectively called profile. 2.15
Profile
The intersection of the plane perpendicular to the axis and the profile. 2.16'meshing
Two objects that maintain contact and move relative to each other can only slide against each other at their contact points, and are not allowed to impact or disengage from each other, that is, the normal relative velocity of the contact tooth surface should remain zero in this motion state. 2.17
Contact pointtouchpoint
The instantaneous tangent point of two conjugate curves on the moving coordinate system during plane meshing. Touch linetouchcurve
The instantaneous tangent curve of two conjugate surfaces on the moving coordinate system during space meshing. Meshing pointmeshpoint
The instantaneous tangent point of two conjugate curves on the static coordinate system during plane meshing. meshcurve
The trajectory of the contact point on the static coordinate plane during the meshing of the plane. 2.21. meshcurvedsurface
The trajectory of each instantaneous meshing line on the static coordinate system during the meshing of the space. 2.22. meshcurvedsurface
The trajectory of each instantaneous meshing line on the static coordinate system during the meshing of the space. 3 Classifications
3.1 Screw compressor, screwcompressor A rotary compressor that compresses and delivers gas through two spiral rotors in the casing (cylinder) that mesh and rotate with each other at a certain transmission ratio.
3.2: Slidingvanecompressor A rotary compressor that has radially reciprocating vanes installed on the eccentrically configured rotor. The vanes are close to the inner wall of the cylinder and form a periodic change in the unit volume as the rotor rotates, thereby achieving the purpose of compressing and delivering gas. Liquid ring compressorliquid ring compressor3.3
A rotary compressor that compresses and delivers gas by rotating the working wheel and discharging liquid under the action of centrifugal force, forming a liquid ring close to the inner wall of the cylinder, and forming a fan-shaped space that expands and contracts periodically between two adjacent blades and the liquid ring. Single screw compressorsinglescrew compressor3.4
A rotary compressor that compresses and delivers gas by meshing the worm and the star wheel. Synonym: (worm compressor).
3.5Two-loberotor compressortwo-loberotor compressor2
JB/T-7662-95
A rotary compressor that compresses and delivers gas by meshing two double-leaf or multi-leaf rotors with each other and rotating them by synchronous gears. 3.6Rotating piston compressorrotatingpiston compressorA type of rotary compressor that makes planetary motion about the center of the cylinder through a piston or rotor driven by a crankshaft. 3.6.1 Rolling rotor compressor rollrotarycompressor A rotary compressor that compresses gas by rotating the piston eccentrically arranged in the cylinder around the center of the cylinder and relying on the sliding vane installed on the cylinder body to make reciprocating motion to achieve the periodic change of the unit volume. Wankel compressor Wankelcompressor3.6.2
A rotary compressor composed of Wankel epicycloid (the rotor belt has a diagonal or triangular structure). 3.7 Scroll compressor scrollcompressor A rotary compressor composed of a moving scroll and a stationary scroll and characterized by the translational meshing of the moving and stationary scrolls to achieve gas compression. 3.8 Dry compressor
A rotary compressor in which the compressed gas is not contaminated by lubricating oil or other liquids during the compression process. 3.9
Liquid injection compressor liquidinjectedcompressor A type of rotary compressor that sprays liquid into the cylinder to cool the gas, cylinder wall, and sealing device to reduce the temperature. 3.9.1 Oil-flooded compressor A rotary compressor that continuously sprays oil into the compression chamber, and separates the oil from the air or gas after the oil-gas mixture leaves the compression chamber.
3.9.2 Water-injected compressor A rotary compressor that continuously sprays water into the compression chamber for the purpose of oil-free lubrication, cooling, sealing, etc., and separates the water from the air or gas after the water-gas mixture leaves the compression chamber. Oil-drop compressor 3.10
A rotary compressor that drips lubricating oil into the compression chamber. 4 Parameters
Nominal diameter of screw rotor4.1
The calculated diameter used to design the screw rotor.
4.2 Length-diameter ratioA parameter that reflects the comparison between the effective length of the rotor and the cylinder diameter. 4.2.1 Length-diameter ratio of screw rotorThe ratio of the effective length of the screw to the nominal diameter of the screw. 4.2.2 Ratio of rotor efficient length to diameter ratio of vane rotorThe ratio of the effective length of the vane rotor to the radius of the cylinder. 4.3 Area utilization coefficientA parameter that indicates the degree of effective utilization of the cylinder area of ​​a rotary compressor. Area utilization coefficient of screw compressorareal coefficient of screw compressor4.3.1
The ratio of the area between teeth enclosed within the nominal diameter of the screw to the area of ​​the circle, which characterizes the utilization degree of the total area within the nominal diameter of the screw.
4.3.2 Area utilization coefficient of sliding vane compressorareal coefficient of sliding vane compressorA coefficient that only relates to the number of vanes, relative eccentricity, and vane thickness and represents the effective utilization degree of the cylinder area. 4.4 Tooth height coefficientaddendum coefficient represents the ratio of the radius of the male screw tooth height to the pitch circle radius. Valley height coefficientdedendum coefficient
When the rotor profile is a double-sided profile, it is the ratio of the small fillet radius of the male screw tooth root to the pitch circle radius. 3
4.6 Warp angle coefficientwarp angle coefficientJB/T7662--95
Represents the coefficient of the influence of the torsion angle on the volumetric filling degree between the screw teeth. Lead
The minimum axial distance between corresponding points on the same spiral line formed by the intersection of the spiral surface of the screw and the cylindrical surface with the axis as the central axis of rotation.
4.8Warp angle
The angle of rotation of the same tooth shape of the screw from the suction end face to the exhaust end face around the axis. 4.9
Helix angle helix angle
The angle between the tangent of the spiral line and the generatrix of the cylinder. When the cylinder is a pitch cylinder, it is the pitch circle helix angle. 4.10Angle of pitch
The angle between the top lines of the adjacent tooth shapes between two teeth of the screw. Male screw tooth packing volume4.11
The part of the male screw's air cavity filled by the female screw's screw teeth at the moment the air cavity and the exhaust port are connected in the screw compressor. Female screw teeth packing volume femalerotorpackingvolume4.12
The part of the female screw's air cavity that is filled by the male screw's teeth at the moment the air cavity and the exhaust port are connected in the screw compressor. 4.13
Relative eccentricityrelativeeccentricityThe ratio of the eccentricity of the vane compressor to the cylinder radius. Relative thickness of bladerelativethicknessofblade4.142
The ratio of the vane thickness of the vane compressor to the cylinder radius. 4.15bZxz.net
Rotor effective lengthrotaryefficientlengthThe length of the part of the scavenging unit volume enclosed by the rotor of the rotary compressor. Blade tip velocityblade-tip velocityThe circumferential speed at the contact point between the top of the vane and the inner wall of the cylinder when the rotor rotates. 4.17 Included angle'oftwobladesThe angle between two adjacent vanes.
degree of lean
The angle between the inclined vane and the rotor radial line passing through the outer end point of the vane slot. Diameter ratio of gate rotor to main rotor The ratio of the diameter of the star wheel to the diameter of the worm in a single-screw compressor. Meshing angle of gate rotor 4.20
The angle through which the teeth of the star wheel rotate from the beginning of precise meshing with the teeth of the worm to the complete disengagement. Axial length of side suction 4.21
The axial length of the worm corresponding to the meshing angle on the intake side in a single-screw compressor. 4.22 Axial length of side discharge The axial length of the worm corresponding to the engagement angle on the discharge side in a single-screw compressor. 5Geometric characteristics
Front segment of profile The front segment of profile is divided by the tooth top. Any tooth profile on the side (low-pressure side) where the two rotors rotate in opposite directions is the front segment of the tooth profile. Back segment of profile 5.2
The back segment of profile is divided by the tooth top. Any tooth profile on the side (high-pressure side) where the two rotors rotate in opposite directions is the back segment of the tooth profile. symmetrical profile
5.3Symmetrical profile
The front and back segments of the tooth profile are symmetrical with the center line of the tooth as the axis. 5.4Asymmetrical profile
asymmetricalprofile
JB/T7662-95
The front and back segments of the tooth profile are asymmetrical with the center line of the tooth as the axis. 5.5Single-side profile The tooth profile is on the same side of the pitch circle with the pitch circle as the boundary. Double-side profile
With the pitch circle as the boundary, its teeth are distributed on both sides of the pitch circle. 5.7
Profile of pin roller arc lineA circular arc line with the center of the pin roller on the pitch circle,
Female screw suction anglesuction angle of male rotator5.8
The angle of the female screw during suction. suction angle of male rotator
Male screw suction angle
The angle of the male screw during suction. Initial angle of internal compression of male rotator5.10
At the beginning of internal compression, the angle between the radial line of the male screw's tooth top and the line connecting the centers of the two screws. 5.11
Male screw internal compression angleangle of male rotatorinternal compressionThe angle of rotation of the male screw from the beginning of internal compression to the instant when the inter-tooth volume of the screw compressor is connected to the exhaust port. Axial suction angle of male screw 5.12
The angle between the top line of the back section of the tooth profile of the closed curve of the axial suction port of the male screw and the line connecting the centers of the two screws. Axial port of suction or discharge 5.13
The through hole for suction or discharge airflow opened on the axial end face of the screw casing for the suction or discharge of gas on the screw compressor. Diametrical port of suction or discharge 5.14
The through hole for suction or discharge airflow opened on the casing surface for the suction or discharge of gas on the screw compressor. The suction port angle suction port angle
characterizes the angle of the suction port position of the rotary compressor. Discharge port angle discharged port angle 5.16
characterizes the angle of the discharge port position of the rotary compressor. Leakage triangle blowhole
When the screw of the screw compressor is meshing, the tooth surface contact point cannot reach the screw tooth top circle, and an approximately triangular leakage channel is formed between the intersection line of the outermost tooth surface contact point and the inner circle surface of the casing. 6 Main parts, components and devices
Casing
The part that contains the rotor in a multi-axis rotary compressor and forms the compressed air working chamber or unit volume together with the rotor. 6.2 Cylinder
The part that forms the compressed air working chamber or unit volume together with the rotor in a single-axis rotary compressor. 6.3
Rotor
Parts in rotary compressors that make a rotary motion in the cylinder (or casing) to form a periodic change in the unit volume. Male screw malerotor
The majority of the teeth and tooth grooves are outside the rotor's pitch circle, and the tooth surface is convex. Female screw femalerotor
The majority of the teeth and tooth grooves are inside the rotor's pitch circle, and the tooth surface is concave. Timing gear
Gear used to maintain non-contact meshing of the two rotors in a rotary compressor. 6.7 Balancing piston
JB/T7662-95
In order to reduce the axial load of the rotary compressor bearing, a part that uses the effect of oil pressure or compressed gas to form a part that is opposite to the load and offsets part of the axial thrust.
6.8 Sliding vane
A plate installed in the groove of the vane compressor rotor, which can slide freely and move close to the inner wall of the cylinder. 6.9 Unload ring
A ring that rotates freely at both ends of the cylinder to reduce the wear of the vane and the cylinder in the vane compressor. 6.10
Main rotor
The rotor part that meshes with the star wheel in the single screw compressor. 6.11
Gate rotor
The rotating part with conjugate tooth side profile that meshes with the worm in the single screw compressor. Orbiting scroll
The part that forms the working volume together with the static scroll in the scroll compressor and can rotate around the center of the crankshaft. Fixed scroll
The fixed part in the scroll compressor that can mesh with the movable scroll to form a crescent-shaped compression chamber. Rolling rotor rolling piston
The rotor in the rotary piston compressor, which is eccentric to the center of the cylinder and forms a rotating part with periodic volume change with the cylinder. 6.15
Capacity sliding governing device Sliding governing device A device on the screw compressor that can move along the axis of the screw to change the effective length of the screw to achieve the purpose of regulating the gas volume. Minimum pressure valve minimum pressure valve 6.16
A device used to maintain the minimum pressure in the oil-gas separator to protect the filter element and maintain the normal operation of the oil circuit. 6.17
Automatic release valve automatic release valve A valve used to automatically release compressed air when the compressor is shut down or the gas volume is adjusted. 6.18 Oil-gas separator A device for treating the oil-gas mixture discharged from the compression chamber, separating the oil from the gas by separation and fine filtration. Index
For Chinese index, see Appendix A (Supplementary), and for English index, see Appendix B (Supplementary). Asymmetric tooth profile
Through volume
Aspect ratio
Tooth height coefficient
Tooth profile front section
Tooth profile back section
Between end faces
Single screw compressor Worm compressor)..
Oil dripping compressor
Symmetrical tooth profile
Single-sided tooth profile
Single screw rotor (worm)
Moving scroll
Enclosed volume·
Index angle
Rolling rotor compressor
Dry compressor·
Valley height coefficient
Rolling rotor
Sliding vane compressor·
Rotary piston compressor
Sliding vane rotor aspect ratio,
Sliding vane compressor area utilization coefficient
Sliding vane top circumferential speed
Sliding vane angle
JB/T7662-95
Appendix A
Chinese index
(supplement)
Sliding vane·
Sliding valve regulating device|| tt||Elementary volume
Radial clearance
Contact point
Contact line
Axial length on the intake side
Radial suction and exhaust ports·
Static scroll
Screw compressor·
Nominal screw diameter.
Screw aspect ratio
Area utilization coefficient of screw compressor
Helix angle
Area utilization coefficient…
Internal leakage
Meshing clearance
Internal compression
Internal pressure ratio
Meshing point
Meshing line
Meshing surface
Torsion coefficient…
Exhaust closed volume
Eccentric configuration||t t||Liquid injection compressor·
Oil injection compressor.
Water injection compressor
Axial length on the exhaust side
Angle of exhaust hole
Balance piston·
Cylinder:
Volume ratio
Instantaneous meshing line
Twin-rotor compressor
Double-side tooth profile·
Synchronous gear
External leakage
External pressure ratio
Wankel compressor
Scroll compressor·
Suction closed volume
JB/T7662-95
Relative eccentricity
Relative vane thickness
Inclined angle
Star wheel diameter ratio||tt| |Star gear meshing angle
Pin tooth arc line
Suction hole angle
Leakage triangle
Unloading ring
Liquid ring compressor·
Stuffing volume between male screw teeth
Stuffing volume between female screw teeth
Female screw suction angle.
Male screw suction angle
Male screw internal compression initial angle
Male screw internal compression rotation angle
Male screw axial suction angle
Male screw
Female screw
Oil-gas separator
Effective rotor length
Axial suction and exhaust holes
Minimum pressure valve
Automatic discharge valve
addendum coefficien
angle of male rotor internal compressionangle of pitch
areal coefficient
areal coefficient of screw compressorJB/T766295
Appendix B
English index
(Supplement)
areal coefficient of sliding vane compressorasymmetricalprofile
automatic release valve
axial length of side disk volume
cylinder
dedendum coefficient
degree of lean :
diameter ratio of gate rotor to main rotordiametrical port of suction or dischargedischargeclosed volume
discharged port angle ...
double-side profile
drycompresso
eccentrically mounting
external leakage
JB/T7662-95
external pressure ratio (actual pressure ratio)F
female rotoy
female rotor packing volume
fixed scroll
front segment of profile
gaterotor
helixangle||tt ||includedangleoftwoblades
initial angle of internal compression of male rotorinstantaneous mesh curve
intermeshing clearance
internal compression
internal leakage
internal pressure ratio (built- in pressure ratio) .....L
length-diameter ratio
length-diameterratioofscrewrotorliquid injected compressor
liquidringcompressor
mainrotor
malerotor
male rotor packing volume
mesh curve
mesh curved surface
meshing
meshingangleofgaterotor
meshpoint
.0000000000000..090009
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