JB/T 8941.1-1999 Roots blowers for general use Part 1: Technical requirements
Some standard content:
JB/T8941.1—1999
This standard is a revision of ZBJ72030—89 “Technical conditions for general-purpose Roots blowers” based on ISO1217:1996 “Positive displacement compressors - Acceptance test”, and is equivalent to ISO1217:1996 in terms of technical content. The main difference between this standard and ZBJ72030--89 is that the flow deviation is equivalent to the specified value in ISO1217, the specific power limit and noise value in the original standard are cancelled, and the volume specific energy deviation under the specified state is added according to ISO1217. This standard is the first part of the JB/T8941 series of standards for general-purpose Roots blowers, which includes the following two parts: JB/T8941.1-1999 General-purpose Roots blowers Part 1: Technical conditions JB/T8941.2-1999 General-purpose Roots blowers Part 2: Performance test methods This standard replaces ZBJ72030-89 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Standardization of Fans. The responsible drafting unit for this standard is Changsha Blower Factory. The participating drafting units of this standard are Shanghai Blower Factory, Tianjin Blower General Factory, Zhangqiu Blower Factory, and Wuhan Blower Factory. The drafters of this standard are Song Yanling, Pan Jie, and Weng Xiaofan. 450
1 Scope
Machinery Industry Standard of the People's Republic of China
Roots type blowers for general purpose
Part 1: Technical conditions
Roots type blowers for general purposePart 1:Specification
JB/T 8941.1-1999
Replaces ZBJ72030--89
This standard specifies the requirements, test methods, inspection rules, marking, packaging, transportation, storage, complete set supply and warranty period for general purpose Roots blowers (including single-stage, two-stage, grouped positive pressure and negative pressure blowers). This standard is applicable to general purpose Roots blowers (hereinafter referred to as blowers) for conveying air and neutral non-toxic gases. The air intake temperature of the blower shall not be higher than 40℃, the content of solid particles in the gas shall not be greater than 100mg/m, and the maximum size of the particles shall not be greater than half of the minimum working clearance of the relative moving parts in the blower cylinder. For blowers conveying other special gases, the manufacturer may consult with the buyer to refer to this standard. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest version of the following subtitles. GB/T 1804---1992
GB/T 2888-
—1991
General tolerances Unspecified tolerances for linear dimensions
Methods for measuring noise of fans and Roots blowersGB/T 10095 --1988
GB/T 133061991
GB/T 13384 --1992
JB/T 8941.2-
—1999
3 Definitions
3.1 Single-stage blowers
Precision of involute cylindrical gears
General technical conditions for packaging of electromechanical products
Roots blowers for general purpose Part 2: Performance test methods Roots blowers in which the gas is compressed in one stage to achieve the purpose of boosting the pressure. 3.2 Two-stage blower
Two Roots blower units connected in series with intercoolers between stages. 3.3 Group blower
A Roots blower unit that combines the motor, air filter, inlet and outlet mufflers, safety valve, check valve, etc. in addition to the blower main engine.
3.4 Negative pressure blower (Roots vacuum pump)
A Roots blower whose exhaust port is directly exposed to the atmosphere, making the air inlet in a negative pressure state. Approved by the State Bureau of Machinery Industry on July 12, 1999 and implemented on January 1, 2000
4 Requirements
4.1 Basic design requirements
JB/T 8941.1—1999
The blower shall comply with the provisions of this standard or be designed according to the contract signed between the manufacturer and the buyer. 4.1.2 The blower should be designed with a service life of not less than 10 years and a safe operation time of not less than 15,000 hours before the first overhaul. 4.1.3 The synchronous gear of the blower should be designed with a service life of not less than 25,000 hours. The precision of the synchronous gear of the blower shall not be lower than the 7-7-7 level specified in GB/T10095. 4.1.4
4.1.5 The lubrication of the synchronous gear of the blower should be reliable. 4.1.6 The casing and wall panels of the blower can be integral or have a split surface. Regardless of the type, it must be ensured that the casing and wall panels are easily and accurately aligned when reassembled.
4.1.7 The impeller and the shaft can be an integral structure or connected into one by other means, but no looseness between the two is allowed. 4.18 The transmission device of the blower should have reliable safety protection measures. 4.1.9 The materials of the blower should comply with the provisions of relevant national standards. 4.2 Performance requirements
4.2.1 The outlet flow of the blower shall be converted to the inlet state. The deviation between the measured volume flow converted to the inlet state and the designed volume flow and the volume specific energy deviation (excluding group blowers) shall not exceed the specified values in Table 1. Table 1
Volume flow under specified conditions
0. 5 ~ 1. 5
Volume flow deviation
Volume specific energy deviation
4.2.2 The blower shall be operated continuously for not less than 2 hours at the specified speed and pressure, and the temperature of each part shall be measured after it stabilizes. The temperature of the bearing part shall not exceed 95C. When ordinary engine oil is used for lubrication in the oil tank, the temperature of the lubricating oil shall not exceed 65C4.2.3 The vibration velocity of the blower support bearing part shall be measured in the three directions of XY and Z at the rated speed and rated pressure. The root mean square value (effective value) of the vibration velocity shall not exceed 11.2mm/s. 4.2.4 The noise of the blower shall be measured in accordance with GB/T2888 with the inlet and outlet silencers installed. If the seller has special requirements for noise, the supplier and buyer shall negotiate and stipulate them in the contract. 4.2.5 The blower shall not have oil or water leakage. 4.3 Manufacturing requirements
4.3.1 The blower shall be manufactured according to the drawings and technical documents approved by the prescribed procedures. 4.3.2 The limit deviation of the un-toleranced dimensions of the blower parts shall comply with the requirements of GB/T1804, and the tolerance grade of the un-toleranced dimensions of metal cutting shall not be lower than Class C in GB/T1804. 4.3.3 The impeller shall be subjected to a dynamic balance test. The dynamic balance quality grade of the impeller shall not be lower than Class G6.3. The permissible displacement of the center of mass is calculated according to formula (1): e = 6.3 X 1 000/a
Where: e-permissible displacement of the center of mass, um; a——maximum working angular velocity, @=2 yuan n/60, rad/s: n-maximum working speed, r/min.
4.3.4 The transmission pulley shall be subjected to a balance test.
4.3.5 The inspection items of synchronous gears and synchronous gear pairs shall comply with the relevant provisions of GB/T10095. .+.*.(1 )
4.3.6 The water chamber, oil cooler of the water-cooled blower and the intercooler of the two-stage blower shall be subjected to a water pressure test. The test pressure shall be 1.5 times the working pressure of the water chamber 452
JB/T8941.1-1999
and there shall be no leakage for 15 minutes. 4.4 Assembly requirementsbZxz.net
4.4.1 Blower parts must be inspected and qualified by the inspection department of the manufacturer. Purchased parts and outsourced parts must have a certificate of conformity and be inspected and qualified by the manufacturer. Assembly can only be carried out after the parts are cleaned and the oil circuit is unblocked. 4.4.2 The gear positioning should be accurate and reliable, and the interchangeability should be good. 4.4.3 The gap between the impellers of the blower, the gap between the impeller and the casing, and the gap between the impeller end face and the wallboard should comply with the requirements of the drawings. 4.4.4 The joints of the exposed parts of the blower should be flat. The misalignment of the joints between the casing and the wallboard, and the joints between the split casing and the wallboard shall not exceed 5 mm.
4.4.5 The outer surface of the blower and its accessories shall not be rusted or scratched. The paint surface should not have paint leakage, paint accumulation, paint flow, bubbling, shrinkage, and obvious color differences.
4.4.6 The cleanliness of the blower should comply with the requirements of Table 2. Table 2
Impeller diameter, mm
>250～500
>500～750
Gearbox (main oil tank)
≤1500
4.4.7 Inspection parts of blower cleanliness
Auxiliary oil tank
≤2000
Single bearing
a) Gearbox (main oil tank): including the inner cavity of the gearbox, gears and other parts in the gearbox. If the gearbox also serves as an oil tank, the lubricating oil should be included;
b) Auxiliary oil tank: including the inner cavity of the oil tank and the lubricating oil; c) Bearing: including the bearing seat, the inner wall of the bearing cover, the bearing and the lubricating oil (grease). 4.4.8 Inspection method of blower cleanliness
Disassemble the detachable parts of the product designated as the inspection object, use a clean brush and gasoline (or kerosene) to clean the parts to be inspected one by one, filter the cleaning liquid with filter paper, and then dry it, weigh the dirt separately, and the number of milligrams of dirt is the cleanliness of the part. 5 Test method
5.1 The blower performance test method should be in accordance with the provisions of JB/T8941.2. 5.2 Blower performance tests are divided into type tests and factory tests. 5.3 Blower type test items include: temperature, pressure, flow, speed, shaft power, volumetric specific energy, volumetric efficiency, vibration, noise, appearance quality and operating conditions.
5.4 Blower factory test items include: temperature, pressure, speed, flow, vibration, appearance quality and operating conditions. 5.5 Blower type tests should start from below 1/4 of the rated exhaust pressure, and two-stage blower type tests should start from below 1/2 of the rated exhaust pressure. Including the rated pressure, 5 groups of test data for no less than 5 groups of exhaust pressures should be measured. 5.6 After the blower type test, a performance curve diagram and a noise spectrum analysis diagram should be drawn. 6 Inspection rules
6.1 The blower must be inspected and qualified by the quality inspection department of the manufacturer, and the product acceptance certificate must be signed before it can be shipped. 6.2 Type inspection should be carried out when the blower is in the trial production stage of a new product or when the performance may be affected by changes in materials or structure. 6.3 All inspections should be carried out with the participation of personnel from the manufacturer's quality inspection department. The test report and records should be signed by the inspectors. The manufacturer should keep the original records of all inspection items. 6.4 The items, time and relevant economic matters required by the purchaser to participate in the test acceptance should be determined in the contract signed by the supply and demand parties. 453
7 Marking, packaging, transportation and storage
JB/T 8941.1—1999
7.1 Product labels and other signs should be fixed in a conspicuous position on the blower. The signs should comply with the provisions of GB/T13306. 7.2 The content of the blower label should include:
a) Manufacturer's name;
b) Product name;
c) Product model;
d) Main performance parameters;
e) Date of manufacture and number.
7.3 The blower should be packed according to the items and quantity required by the packing list. 7.4 The packaging of the blower should comply with the provisions of GB/T13384 and meet the requirements of transportation. 7.5 The following preparations should be made before packing the blower: a) The exposed machined surface should be coated with an appropriate anti-rust layer. The anti-rust agent used should ensure that it can be rinsed clean with solvent before installation and operation; b) The air inlet and exhaust port should be sealed with waterproof and dustproof materials. 7.6 The blower packaging should be marked. The contents include: a) product name and model; b) product factory number, c) box size and weight; d) destination and consignee; e) departure station, manufacturer name and delivery date. 7.7 The blower should be accompanied by the following technical documents: a) packing list; b) product certificate; c) product manual; d) other relevant technical documents. The random technical documents should be packed in moisture-proof packaging bags. 7.8 The blower and its accessories should be placed in a dry, well-ventilated warehouse or covered place without harmful gases. 8 Complete set supply and warranty period 8.1 The complete set supply items (motor, air filter, import and export muffler, etc.) and quantity of single-stage and two-stage blowers should be determined in the contract signed by the supply and demand parties.
8.2 Provided that the buyer complies with the blower storage, installation, use and maintenance rules provided by the supplier, the supplier shall provide a 18-month quality assurance period for the blower from the date of shipment. During the quality assurance period, if the blower is damaged or cannot work properly due to manufacturing quality problems, the supplier shall repair or replace it for the user free of charge.
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