JB/T 7265-1994 Steam Flow Vacuum Pump JB/T7265-1994 Standard Download Decompression Password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T7265-94
Steam Flow Vacuum Pump
Published on 1994-07-18
Ministry of Machinery Industry of the People's Republic of China
Implementation on 1995-07-01
Mechanical Industry Standard of the People's Republic of China
Steam Flow Vacuum Pump
Subject Content and Scope of Application
JB/T 726594
Generation Police ZBJ78012-85
This standard specifies the type, specification and basic parameters of steam flow vacuum pumps (including diffusion vacuum pumps and diffusion jet vacuum pumps), technical requirements, test methods and inspection rules, as well as marking, packaging, transportation and storage. This standard applies to diffusion vacuum pumps and diffusion jet vacuum systems using oil vapor as the working medium. 2 Reference Standards
GB3163
GB6070
GB 6307.2
GB7775
GB7776
Packaging storage and transportation pictorial symbols
Vacuum technical terms
Vacuum method cover
Test method for pumping rate (volume flow rate) of steam flow vacuum system Test method for critical foreline pressure of steam flow vacuum pump Test method for liquid reflux rate of steam flow vacuum pump Test method for heating time and heating power of steam flow vacuum pump GB/T13306 label
GB/T13384
ZBJ78016
3 Model
General technical conditions for packaging of electromechanical products
Vacuum pump model compilation method
3.1 The steam flow vacuum pump specified in this standard is a metal multi-stage accumulator with water cooling the pump wall. 3.2 The structural type of the inlet and exhaust flanges of the steam flow vacuum pump shall comply with the provisions of GB6070. 3.3 There should be no flange bolt holes on the center line between the air inlet and the exhaust port of the diffusion vacuum pump. 4 Specifications and basic parameters
4.1 Diffusion vacuum pumps are divided into nine specifications according to the air inlet diameter, and their basic parameters should comply with the provisions of Table 1. 4.2 Diffusion jet vacuum systems are divided into seven specifications according to the air inlet diameter, and their basic parameters should comply with the provisions of Table 2. Approved by the Ministry of Machinery Industry on July 18, 1994
Implemented on July 1, 1995
Pumping rate
Ultimate pressure
Straight type
Convex cavity type
Critical foreline pressure Pa
Heating time
Recommended heating power
Heater power supply voltage V
Recommended pump oil brand
Recommended pump oil dosage
Recommended cooling water base
At 20±5C 1/h
Recommended foreline pump pumping rate
≤250
JB/T 7265--94
1. 5~4. 0
≤1.5×10-
No. 2 or No. 3 diffusion oil
Note: 1) When the air inlet pressure is in the range of 3×10-3～7×10-*Pa, the average value measured for air. Table 2
Pumping rate 1
Ultimate pressure
Critical foreline pressure
Recommended heating power
Heater power supply voltage V
Pump oil brand
Recommended pump oil dosage
Recommended cooling water dosage
At 20±5℃
Recommended foreline pump pumping rate
≤800
≥2300
≥3600
1×10-1
≥140
≥20000
≥24000
Diffusion spray vacuum pump oil (boosting pump oil)
Note, 1) When the inlet pressure is 1.3Pa, the value measured for air. Technical requirements
≥140
≤2500
5.1 The product shall comply with the requirements of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 5.2 The main performance parameters and technical parameters of the product shall comply with the provisions of Table 1 and Table 2. 2
≥240
>13000
50~200
≤3500
>30000
≤2500
≥22000
150~500
JB/T 7265—94
5.3 The steam flow vacuum pump shall work continuously and reliably under the following conditions: a. The working environment temperature is 5～30℃; b. The relative humidity is not more than 85%; c. The cooling water outlet temperature does not exceed 40℃. 5.4 The pump body and its welds must ensure airtightness, and the pressure increase rate shall not be greater than the following values: a.
Diffusion vacuum pump body: 3×10*Pa/min: Diffusion radiated vacuum pump body: 1.8Pa/min. 5.5 The saturated steam pressure of the working liquid of the steam flow vacuum pump at 20℃ should be lower than the following values: Diffusion vacuum pump oil: 2.5×10-*Pa;
b. Diffusion jet vacuum pump oil: 2.5×10\Pa, 5.6 The vacuum rubber seal ring used for the pump should comply with the provisions of GB6070.5. 5.7 The live part of the heater and its shell should be reliably insulated, and its insulation resistance should be greater than 5MA, and it can withstand 50Hz, 1000V AC voltage for 1min without being broken down,
5.8 The non-heating surface of the heater and the surrounding of the boiler should have a normal thermal insulation layer. 5.9 Each product should be equipped with the following vulnerable spare parts: a.
One set of rubber seal rings:
According to user needs, provide an appropriate amount of pump oil, and indicate it in the order contract. According to user needs, provide an appropriate amount of electric heating elements, and indicate it in the order contract. 5.10 Under the condition that the user complies with the storage and use rules, within one year from the date of shipment from the manufacturer, if the product is damaged or fails to work properly due to poor manufacturing quality, the manufacturer shall repair or replace it for the user free of charge. 6 Test methods and inspection rules
6.1 Performance measurements shall be carried out according to the test methods specified in GB6307.1, GB6307.2, GB7775 and GB7776. 6.2 Each product must pass the inspection before it can leave the factory, and a quality certificate shall be attached. 6.3 Product inspection is divided into:
Factory inspection;
Type inspection.
6.4 Each product must undergo factory inspection, and the items are: a.
Ultimate pressure:
Pumping rate;
Appearance quality.
6.5 Type inspection items are:
Ultimate pressure;
Evacuation rate;
Pre-critical pressure;
Heating time;
Heating power:
Return rate (diffusion vacuum image creation product inspection item). 6.6 When the product belongs to one of the following situations, type inspection shall be carried out; a. New products produced on trial;
b. When there are major changes in the design process or materials used. 6.7 For type inspection of mass-produced products, 1 to 2 units shall be sampled for each batch according to product specifications. If there are unqualified ones, double sampling shall be carried out. If there are unqualified ones again, all products in the batch shall be inspected. 3
7 Marking, packaging, transportation and storage
JB/T7265-94
7.1 Products shall be equipped with signs, and their production shall comply with the provisions of GB/T13306. The contents include the following items: 8.
Manufacturer name;
Product name and model:
Main parameters: ultimate pressure, pumping rate, heating power and voltage; product number and date of manufacture.
7.2 The air inlet and outlet of the product must be sealed with blind plates, and no residual water should remain in all water cooling parts. 7.3 The following technical documents should be accompanied by the product when it leaves the factory: a.
Packing list and spare parts list;bzxZ.net
Product certificate;
Product manual,
7.4 The transport packaging mark should comply with the provisions of GB191. 7.5 The packaging of the product should comply with the provisions of GB/T13384. The product should not be subjected to severe vibration during transportation and storage, and should be placed in a well-ventilated room. 7.6
Additional instructions:
This standard is proposed by the National Vacuum Technology Standardization Technical Committee. This standard is under the jurisdiction of the Shenyang Vacuum Technology Research Institute of the Ministry of Machinery Industry. This standard was drafted by Shenyang Vacuum Technology Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Zhang Yao and Li Yuying.
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