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Mechanical Industry Standard of the People's Republic of China
JB/T1246-1997
Sliding Valve Vacuum Pump
1997-04-15 Issued
Ministry of Machinery Industry of the People's Republic of China
1998-01-01 Implementation
JB/T1246-1997
This standard is a revision of JB/T1246-92 "Sliding Valve Vacuum Pump Type and Basic Parameters" and JB/T1247-91 "Sliding Valve Vacuum Ticket Technical Conditions". When revising this standard, detailed provisions were made on the measurement method, but it basically followed JB/T7266--94 "Volumetric Vacuum System Performance Measurement Method", with only slight changes in the measurement of the ultimate pressure and the pumping rate, and the use of a simple method to measure the noise. This standard unifies the types and parameters of lubrication systems, technical conditions and performance parameters listed in the classification standards, and incorporates them into the performance parameters of this standard. In order to meet the needs of users, this standard includes the ultimate full pressure value in the standard. From the date of entry into force, this standard will replace IB/1246-92 and IB/T1247-91 at the same time. Appendix A, Appendix B and Appendix C of this standard are all standard appendices. This standard is proposed and managed by the National Vacuum Technology Standardization Technical Committee. The drafting units of this standard are: Shenyang Vacuum Technology Research Institute of the Ministry of Machinery Industry, Zhejiang Vacuum Equipment Group Co., Ltd., Fupin Vacuum Equipment Co., Ltd. The main drafters of this standard are: Li Chunying, Luo Gensong, Zhao Xianling, Zhang Hongkai. This standard was first issued in 1992.
1 Scope
Machinery Industry Standard of the People's Republic of China
Sliding Valve Vacuum Pump
JB/T 1246 - 1997
Generation JB/T1247:91
FB/T 1246i - 92
This standard specifies the type and parameters, technical requirements, test methods, inspection rules and markings, packaging, storage, etc. of sliding valve vacuum pumps. This standard applies to various types of single-stage and two-stage sliding valve vacuum pumps (hereinafter referred to as pumps). 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. The versions shown in this standard are valid at the time of publication. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB191-90
GB/T 316393
GB 3785 83
GB/T 13306--91
GB/T 13384-92
JB/T 767395
SH 0528--92
3 Definitions
Packaging storage and transportation pictorial symbols
Vacuum technical terms
Electroacoustic performance and measurement method of sound level meter
General technical conditions for packaging of electromechanical products
Vacuum equipment model compilation method
Mineral oil type vacuum pump oil
This standard adopts the following definitions.
3.1 Pumping rate
When the ticket is equipped with a standard test cover and works under specified conditions, the ratio of the gas flow rate flowing through the test cover to the equilibrium pressure measured at the specified position on the test cover is referred to as the pumping speed. The unit is liter/second (L·\. [GB/T3163-93 4.5.1] 3.2 Ultimate pressurewwW.bzxz.Net
When the ticket is equipped with a standard test cover and works under specified conditions, the lowest pressure that tends to stabilize under the condition of normal operation without introducing gas. The unit is Pa (Pa). [GB/T3163-93 4.5.8] 3.3 Geometric pumping speed
The product of the theoretical suction volume per revolution of the pump and the rated speed. The unit is liter/second (L·s\), and the time unit of the speed is second (s). 4
Type and parameters
4.1 Type The structure of the slide valve vacuum pump is that there is a slide valve ring outside the eccentric rotor. When the rotor rotates, the slide valve ring is driven to slide and roll along the inner wall of the pump casing. The slide valve rod fixed on the slide valve ring can move in the swingable slide valve guide installed in the appropriate position of the ticket casing, and the pump chamber is divided into two variable volume single-stage and double-stage structures.
4.2 Parameters
The performance parameters of the pump should comply with the provisions of Table 1. 4.3 Model
Approved by the Ministry of Machinery Industry on April 15, 1997
Implementation on January 1, 1998
JB/T 1246—1997
The compilation and representation of the model shall comply with the provisions of 1B/T7673. 4.4 Marking example
A two-stage sliding valve vacuum pump with a pumping rate of 70L/s is marked as: 2H-70
Sliding valve vacuum pump
A single-stage sliding valve vacuum pump with a pumping rate of 150L/s is marked as: sliding valve vacuum pump
Table 1 Performance parameters
2H-150| |tt||Ultimate pressure
(gas ballast off)
6×10-
≤6×10-
≤6×10-2
6×10-
6×10-*
66×10-
6×10-
Total pressure
(gas ballast off》
Salt gas efficiency
2Pa
1. 5kPa
Terminal sound L
1 Pumping efficiency is the ratio of the measured pumping speed to the geometric pumping speed. When designing the pumping speed, refer to 5.2.52. Specific power is the ratio of the maximum clean power consumption of the pump to the nominal pumping speed. Specific power
≤190
Flange
Nominal inner diameter
Inlet and outlet
3 The limit pressure in the table refers to the indication of the McLaren meter: The limit total pressure refers to the total pressure of other pressure gauges such as calibrated thermocouple meters. The indicated value is not used as a factory assessment indicator, but the manufacturer must report it. 4 The pumping speed refers to the nominal pumping speed.
5 Technical requirements
5.1 Applicable conditions
5.1.1 The pump should be used in an ambient temperature range of 5~40℃. 5.1.2 The maximum inlet pressure allowed for long-term operation is 1.5kPa. The pumping time shall not exceed 5min. 5.1.3 The temperature measured near the ticket exhaust is the ticket working temperature. Under the conditions of specified ambient temperature and specified cooling water volume (for water-cooled system, the cooling water inlet temperature should be lower than 30℃), the working temperature of the pump under the limit pressure shall not exceed 60℃. The temperature of the pump under the maximum inlet pressure shall not exceed 80℃. 5.1.4 It is recommended to use the vacuum system oil specified in SH0528. 5.2 Requirements
5.2.1 The performance indicators of the ticket shall comply with the provisions of Table 1 (except the limit full pressure value) and be manufactured according to product drawings and technical documents. 5.2.2 Under the specified test conditions, the vacuum degree of the pump reaches a level close to the limit pressure within 15 minutes after starting (not more than 22
times the limit pressure).
5.2.3 The pump should not leak oil or water. JB/T1246-1997
5.2.4 The system operates under the specified limit pressure, and its noise indicators shall comply with the provisions of Table 1. 5.2.5 The geometric pumping speed value of the system should be 1 to 1.2 times the nominal pumping speed, and its value should be given in the product manual. 5.2.6 The reliability index mean time between failures (MTBF) should be given in the manual. 6 Sampling and determination method
6.1 Sampling method
6.1.1 Composition of inspection batch
Single pumps are simply collected to form an inspection batch. The inspection batch can be the same or different from the production batch, sales batch, and transportation batch. It consists of single systems of the same specification or different specifications, the same quality grade, and basically the same production conditions and production time. However, the batch size of each inspection batch shall not exceed 250 units.
The composition of the batch, the size of the batch, and the method of identifying the batch, etc., should be determined through negotiation. 6.1.2 Sampling plan
A single sampling plan is adopted, with 2 samples in each batch and 0 qualified judgment number. 6.1.3 Sample extraction
Samples shall be randomly extracted from the inspection batch, which can be carried out after the batch is formed or during the batch formation process. 6.1,4 Sample inspection
The extracted samples shall be inspected according to the method specified in Chapter 7. 6.2 Judgment method
Each system (sample unit) must meet the technical requirements of all assessment items of this standard to be a qualified product. Any product that fails to meet any of the indicators specified in this standard shall be judged as an unqualified product. If the two pumps constituting the sample are both qualified products, the batch shall be judged as a qualified batch. Otherwise, the batch shall be judged as an unqualified batch.
Test method
7.1 Determination of suction rate (volume flow rate)
7.1.1 Principle
The suction rate is measured by the "constant pressure method". That is, the pressure in the test hood remains constant during the test. 7.1.2 Apparatus
7.1.2.1 Test hood
As shown in Figure 1 (a), the shape is simple, with an inner diameter of D and a height of 1.5D. The test gas inlet is located on the axis of the hood. It is facing away from the port and is at a distance of D from the flange plane. The vacuum gauge (or gauge) connecting pipe is 0.5D away from the flange plane and perpendicular to the axis of the hood. The volume V of the hood should be at least 5 times the volume Vp swept by the pump in one compression cycle. A reducer with a length not exceeding 0.5D must be connected between the hood and the pump port, as shown in Figure 1 (b). The applicable test hoods of different specifications are given in Table 2. Table 2 Test hood diameter series size
65~260
7.1.2.2 Vacuum gauge
JB/T12461997
Connection auxiliary valve
Diameter of the port
Figure 1 Test hood
Select vacuum gauges of different types and accuracies according to the measured pressure. When the pressure is greater than or equal to 1Pa, the calibration accuracy is within 5%; when the pressure is less than 1Pa, the calibration accuracy is within ±10%. For other requirements on vacuum gauges, see Appendix A (Appendix to the standard). 7.1.2.3 Flowmeters
According to the measured flow rate, select flowmeters of different types and specifications, and their accuracy is: for flow rates greater than 9.9×10\Pa·m/s, within ±3%; for flow rates between 9.9×101~9.9×10\Pa·m*/s, within ±5%; for flow rates less than 9.9×10*Pa·m/s, within ±10%. For other requirements and calculations on flowmeters, see Appendix B (Appendix to the standard). 7.1.3 Test conditions
7.1.3.1 The difference between the actual speed and the rated speed shall not exceed ±3%, and shall be corrected. 7.1.3.2 The type and quantity of pump oil shall meet the design requirements. 7.1.3.3 The cooling water flow and temperature of the water-cooled pump shall meet the design requirements. 7.1.3.4 The ambient temperature shall be between 15 and 25°C. The fluctuation during the test shall not exceed ±1°C. 7.1.3.5 The test gas shall be indoor air with a relative humidity of no more than 75%. 7. 1.3. 6
When measuring the gas ballast pump, its gas entrainment shall meet the design requirements. 7.1.4 Procedure
The pumping rate (volume flow rate) test device is shown in Figure 2. 4
JB/T12461997
Close the fine adjustment, open the ticket operation, and when the pressure in the hood is close to the limit pressure and the pump temperature is balanced, open the fine adjustment valve, put the test gas into the hood to establish a set equilibrium pressure, and measure the gas flow at the same time. The test should start from an appropriate value slightly higher than the limit pressure, until atmospheric pressure or other pressures suitable for the pump structure characteristics, and measure at least three points in each pressure level (roughly 2.5.5, 10). If the flow measurement time is long, the pressure should be re-measured and the average value should be taken. If the difference between the highest reading and the recorded reading is greater than 10% of the average value, the flow and pressure should be re-measured. For the gas ballast pump, the fine adjustment valve should be closed after the above test, the gas ballast valve should be fully opened, and the pumping rate (volume flow rate) during gas ballast should be tested again after the pump temperature is balanced again.
Calculate the pumping speed based on the test results, and refer to Figure 4 to give the pumping speed-inlet pressure curve. Connect the auxiliary air intake adjustment
micro-retreat time
7.1.5 Calculation
In the formula; \,--pumping speed at the measured speed.L/s; \.--flow rate.Pa·n\/s:
Pingde pressure, Pa
Deputy test officer
Figure 2 Test device
5, = 1000g/g
When the difference between the measured speed of the pump and the rated speed is not more than ±3%, it can be corrected according to formula (2): Sg=5,ng/n
In the formula: 58—
Pumping speed at rated speed, L/s:
5—Pumping speed at measured speed, L/s:
no—Rated transfer, r·min;
Measured speed, r·mini.
7.2 Determination of ultimate pressure
7.2.1 Principle
Install the specified test hood on the port and measure the pressure inside the hood at the equilibrium temperature. 7.2.2 Apparatus
7.2.2.1 Test hood
According to 7.1.2.1.
7.2.2.2 Vacuum gauge
JB/T1246—1997
Use a standard compression vacuum gauge to measure the ultimate pressure of the pump. Its calibration accuracy is: within 5% when the pressure is greater than or equal to IPa; within ±10% when the pressure is less than 1Pa.
For other specific requirements, see Appendix A.
Use other total pressure vacuum gauges whose sensitivity is independent of the type of gas (or vapor), such as a diaphragm gauge, to measure the ultimate total pressure of the pump. The vacuum gauge should be calibrated with an accuracy of ±10% of the measured pressure. No cold trap is allowed between the gauge and the test hood. 7.2.3 Test conditions
The ambient temperature is between 15 and 25°C, and the rest is in accordance with 7.1.3.1, 7.1.3.2, 7.1.3.3, 7.1.3.5 and 7,1.3.6. 7.2.4 Procedure
The ultimate pressure filter test device is shown in Figure 2.
Close the fine-tuning valve, and the ticket brow should be operated for at least 1 hour under gas ballast, and then operate for another 1 hour under gas ballast. After the temperature is stable, the pressure is measured every 30 minutes. When the results of three consecutive tests show that the pressure no longer changes, it is considered to have reached the ultimate pressure. For gas-ballast tickets, the gas ballast valve can be fully opened after the above test, and the ultimate pressure during gas ballast can be tested after the ticket temperature is balanced again. 7.3 Determination of power consumption
7.3.1 Principle
At various inlet pressures, use a wattmeter to measure the input power of the drive motor, and then multiply it by its efficiency under different loads. This is the power consumption of the ticket.
7.3.2 Apparatus
7.3.2.1 Test hood
According to 7.1.2.1.
7.3.2.2 Vacuum gauge
For measuring pressure greater than or equal to 1Pa, its calibration accuracy is ±5% For lower pressures, the calibration accuracy is ±10%. For other requirements, see Appendix A.
7.3.2.3 Wattmeter and current transformer
The wattmeter and current transformer should have a 0.5 grade accuracy. 7.3.3 Test conditions
According to 7.2.3.
7.3.4 Procedure
Close the fine-adjustment valve and the auxiliary air inlet valve, and after the ticket temperature is balanced, open the fine-adjustment valve or the auxiliary air inlet valve to make the pressure in the hood from low to high and stabilize point by point. At the same time, measure the power value. The test value should have two significant digits. For the gas ballast pump, the gas ballast valve should be fully opened after the above test, and after the system temperature is balanced again, test the power consumption during gas ballast. Draw the power consumption-inlet pressure curve based on the measurement results. See Figure 4. 7.4 Determination of working temperature
7.4.1 Device
Thermometer: the error is not more than ±1C.
7.4.2 Test conditions
According to 7.2.3.
7.4.3 Procedure
After the system runs at the limit pressure for 1 hour, continuously measure the temperature near the exhaust valve or other temperature measuring parts. If the temperature change does not exceed 1C within 1 hour, the final indicated temperature of the thermometer is the working temperature of the ticket. 6
JB/T 1246—1997
For gas ballast pumps, the gas ballast should be fully opened after the above test, and the pump should continue to operate for 1 hour before testing the working temperature of the gas ballast. The working temperature should preferably be measured at the same time as the ultimate pressure. 7.5 Determination of noise sound power level - Simple method 7.5.1 Measurement items
The main measurement item is the A-weighted sound power level. 7.5.2 Device
7.5.2.1 Noise measurement device
Select a sound level meter of type 2 or above specified in GB3785, or other measuring instruments with equivalent accuracy. It is best to use an extension cable or extension rod to connect the sound level meter or other measuring instruments to the microphone. 7.5.2.2 Standard sound source
It should have a constant broadband sound power output and be calibrated according to 1/3 octave and octave. 7.5.2.3 Calibration
Before and after each measurement, the entire measurement system (including cables) shall be calibrated at one or more frequencies using a sound level calibrator with an accuracy within ±0.5dB. A sound level calibrator or piston generator may be used for calibration. Sound level meters and other measuring instruments shall be calibrated regularly. 7.5.3 Test conditions
7.5.3.1 Acoustic environment
a) Measurement environment
A hard and flat outdoor location or an environment that meets the requirements of Appendix C (Appendix to the standard). b) Background noise
The difference between the A-weighted sound pressure level of the pump radiated noise and the background noise sound pressure level measured at the same measuring point shall be above 10dB(A). When the difference between the two is 3-10dB(A), the measured value should be corrected according to Table 3; if the difference is less than 3dB(A), the measurement is invalid. Table 3 Back-recording sound correction value
Difference between pump radiation noise sound pressure level and renal sound sound pressure level Background noise sound pressure level correction value
7.5.3.2 Installation
The system to be tested should be placed on the ground or elastic material in the test site. When the pump vibrates too much, a fixed installation can be used and it should be noted in the test report
When the above installation is used, additional noise should be avoided. 7.5.3.3 Operating conditions
When measuring the gas ballast system, turn off the gas ballast and read the rest according to 7.1.3.1, 7.1.3.2 and 7.1.3.3.7.5.3.4 Working conditions
The splash pump is not connected to the test cover, the air inlet is closed, and the pump is operated for at least 30 minutes. Noise measurement can be carried out only after the cumulative overflow is balanced and the limit pressure is reached.
7.5.4 Procedure
7.5.4.1 Reference body
A minimum rectangular hexahedron that envelops the system to be tested and ends on the reflection plane is used as the reference body. The measurement surface and measurement points are arranged based on the reference body. When determining the size of the reference body, the protruding parts of the system can be ignored as long as they are not the main radiators of sound energy. 7.5.4.2 Measurement surface and measurement point location
a) Measurement surface
A rectangular hexahedron with all faces parallel to the reference body is used as the measurement surface. The measurement surface area S is calculated by formula (3): S = 4(ab + bc + ca)
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