CN212228299U

CN212228299U - Pressure transmitter test system

Info

Publication number: CN212228299U
Application number: CN202020726399.2U
Authority: CN
Inventors: 冯翠; 潘俊
Original assignee: Shanghai Guanghua Instrument Co ltd
Current assignee: Shanghai Guanghua Instrument Co ltd
Priority date: 2020-05-06
Filing date: 2020-05-06
Publication date: 2020-12-25
Anticipated expiration: 2030-05-06

Abstract

The utility model relates to a pressure transmitter test system, which comprises a vacuum chamber and an air extractor, wherein the vacuum chamber is provided with a test interface and a connection interface, and is also connected with an air inlet pipeline, a first air extraction pipeline and a second air extraction pipeline; the air inlet pipeline comprises a first interface arranged in the vacuum chamber and a first valve of which one end is connected with the first interface, the other end of the first valve is connected with a first fine tuning valve, and the other end of the first fine tuning valve is communicated with the atmosphere; the first air suction pipeline comprises a second interface arranged in the vacuum chamber, and a second valve of which one end is connected with the second interface, and the other end is connected with the air suction device; the second air pumping pipeline comprises a third interface arranged in the vacuum chamber and a third valve with one end connected with the third interface, the other end of the third valve is connected with a second fine tuning valve, and the other end of the second fine tuning valve is connected with an air pumping device. The scheme can improve the accuracy of the pressure regulation of the vacuum chamber, thereby improving the accuracy of the judgment of the test result of the product to be tested of the pressure transmitter.

Description

Pressure transmitter test system

Technical Field

The utility model relates to a test equipment especially relates to a pressure transmitter test system.

Background

A pressure transmitter is a device that converts pressure into a pneumatic signal or an electric signal for control and remote transmission. The pressure sensor can convert physical pressure parameters of gas, liquid and the like sensed by the pressure element sensor into standard electric signals (such as 4-20 mADC and the like) so as to supply secondary instruments such as an indication alarm instrument, a recorder, a regulator and the like for measurement, indication and process regulation.

The existing capacitive film absolute pressure transmitter generally comprises a vacuum chamber, wherein the product to be tested is connected to the vacuum chamber to measure the pressure of the vacuum chamber under the condition that the vacuum degree of the vacuum chamber is known, and the product to be tested is judged whether to reach the standard or not according to the measurement result. In order to obtain a more accurate test result, a product to be tested is usually tested under the condition of different pressures in the vacuum chamber, the pressure adjustment of the existing vacuum chamber is a very delicate work, and the inaccurate pressure adjustment of the vacuum chamber affects the accuracy of the judgment of the test result of the product to be tested.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a pressure transmitter test system can improve the accuracy of real empty room pressure regulation and control to improve the accuracy that pressure transmitter product test result that awaits measuring judges.

The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme: a pressure transmitter test system comprises a vacuum chamber and an air extractor, wherein the vacuum chamber is provided with a test interface for connecting a product to be tested and a connection interface for connecting a reference meter, and is also connected with an air inlet pipeline, a first air extraction pipeline and a second air extraction pipeline;

the air inlet pipeline comprises a first interface arranged in the vacuum chamber and a first valve of which one end is connected with the first interface, the other end of the first valve is connected with a first fine tuning valve, and the other end of the first fine tuning valve is communicated with the atmosphere;

the first air suction pipeline comprises a second interface arranged in the vacuum chamber, and a second valve of which one end is connected with the second interface, and the other end is connected with the air suction device;

the second air pumping pipeline comprises a third interface arranged in the vacuum chamber and a third valve with one end connected with the third interface, the other end of the third valve is connected with a second fine tuning valve, and the other end of the second fine tuning valve is connected with an air pumping device.

By adopting the technical scheme, the connection interface of the vacuum chamber can be used for connecting a pressure transmitter product which is higher in precision grade and qualified through detection as a reference table, and the pressure in the vacuum chamber can be accurately measured as a reference measurement result through the reference table. If the vacuum chamber needs to be pressurized in the testing process, the first valve and the first fine adjustment valve can be opened in sequence to realize pressurization, and the pressurization amount is controlled through the first fine adjustment valve, so that the pressure of the vacuum chamber is convenient to regulate and control. The vacuum chamber can be vacuumized by connecting the first air suction pipeline and the second air suction pipeline with the air suction device under the condition of overpressure of the vacuum chamber. When the required vacuumizing degree is larger, the second valve, the third valve and the second fine adjustment valve can be opened simultaneously to synchronously pump air. When the required vacuum degree is smaller, the second valve is closed, air is extracted through the second air extraction pipeline, and the air extraction amount is controlled through the second fine adjustment valve, so that the pressure regulation of the vacuum chamber is more accurate. The accuracy of the pressure regulation and control of the vacuum chamber is improved, and the accuracy of the judgment of the test result of the product to be tested is improved by combining the measurement result of the reference table.

The present invention may be further configured in a preferred embodiment as: the control console is provided with a reference display which is connected with the reference table and used for displaying the measurement data of the reference table.

By adopting the technical scheme, the measurement result of the reference table can be directly displayed on the console through the reference display, so that the comparison of the measurement result is more convenient.

The present invention may be further configured in a preferred embodiment as: the control console is provided with a to-be-tested display which is used for being connected with a to-be-tested product and displaying measurement data of the to-be-tested product.

By adopting the technical scheme, the measurement result of the product to be measured can be directly displayed on the console through the display to be measured, so that the comparison of the measurement result is more convenient.

The present invention may be further configured in a preferred embodiment as: the three-way valve is characterized by further comprising a three-way pipe, the first end of the three-way pipe is connected with one end, far away from the second connector, of the second valve, the second end of the three-way pipe is connected with one end, far away from the third valve, of the second fine adjustment valve, and the third end of the three-way pipe is connected with the air exhaust device.

Through adopting above-mentioned technical scheme, first bleeder line and second bleeder line all communicate to the three-way pipe, and the three-way pipe is connected with air exhaust device, because all be equipped with the valve on first bleeder line and the second bleeder line, consequently adopt above-mentioned structure can the arbitrary bleeder line work of direct control or simultaneous working.

The present invention may be further configured in a preferred embodiment as: the air extracting device comprises a mechanical pump, a molecular pump, a three-way reversing valve and a switch valve, wherein the input end of the three-way reversing valve is connected with the third end of the three-way pipe, the first output end of the three-way reversing valve is connected with the input end of the mechanical pump, the second output end of the three-way reversing valve is connected with the input end of the molecular pump, the output end of the molecular pump is connected with the input end of the switch valve, the output end of the switch valve is connected with the input end of the mechanical pump, and the output end of the mechanical pump is communicated with the atmosphere.

By adopting the technical scheme, when the passage of the three-way reversing valve is the input end and the first output end, the mechanical pump can pre-pump the vacuum chamber as the low-vacuum pump, so that the vacuum chamber reaches a rough vacuum state, and the pre-pumping by adopting the mechanical pump has the advantages of large flow and high speed. When the passage of the three-way reversing valve is an input end and a second output end, the mechanical pump is used as a backing pump of the molecular pump, the molecular pump is a high-vacuum pump, an operation environment is provided for the molecular pump through the mechanical pump, and the molecular pump is used for further evacuating the vacuum chamber.

The present invention may be further configured in a preferred embodiment as: the number of the test interfaces is multiple, and the number of the test interfaces is 10.

By adopting the technical scheme, 10 products to be tested can be simultaneously installed for testing, and the testing efficiency is high.

The present invention may be further configured in a preferred embodiment as: the number of the connecting interfaces is multiple, and the number of the connecting interfaces is 3.

By adopting the technical scheme, three reference meters, such as three reference meters with different ranges, can be installed at the same time, so that the test comparison can be conveniently carried out on products to be tested with different ranges.

To sum up, the utility model discloses a following at least one useful technological effect:

1. the pressure of the vacuum chamber can be more accurately regulated and controlled, and the accuracy of the judgment of the test result of the product to be tested is improved.

2. A plurality of products to be tested can be tested simultaneously.

Drawings

FIG. 1 is a schematic diagram of the gas circuit of the present embodiment;

fig. 2 is a schematic structural diagram of the present embodiment.

Reference numerals: 1. a vacuum chamber; 2. an air extraction device; 3. a console; 4. a test interface; 5. connecting an interface; 6. a reference table; 7. a product to be tested; 8. a reference display; 9. a display to be tested; 10. an air intake line; 11. a first air extraction pipeline; 12. a second air extraction pipeline; 13. a first interface; 14. a second interface; 15. a third interface; 16. a first valve; 17. a second valve; 18. a third valve; 19. a first trim valve; 20. a second trim valve; 21. a three-way pipe; 22. a three-way reversing valve; 23. a mechanical pump; 24. a molecular pump; 25. and (4) switching on and off the valve.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1 and 2, the pressure transmitter testing system disclosed in this embodiment includes a vacuum chamber 1, an air extractor 2, and a console 3, wherein the main body of the vacuum chamber 1 is a stainless steel tank. The vacuum chamber 1 is provided with a test interface 4 for connecting a product 7 to be tested and a connection interface 5 for connecting a reference table 6. The number of the connection interfaces 5 and the number of the test interfaces 4 are both plural, and in this embodiment, the number of the test interfaces 4 is preferably 10, and the number of the connection interfaces 5 is preferably 3. The connection interface 5 can be used for connecting a pressure transmitter product which has higher precision grade and is qualified through detection as a reference table 6, and the pressure in the vacuum chamber 1 can be accurately measured as a reference measurement result through the reference table 6. The three reference tables 6 can be selected to be different in measuring range, and the reference table 6 corresponding to the measuring range can be selected to be used for measuring result data comparison according to the product 7 to be measured with different measuring ranges. The console 3 is provided with a reference display 8 which is connected with the reference table 6 and used for displaying the measurement data of the reference table 6 and a display 9 to be tested which is connected with the product 7 to be tested and used for displaying the measurement data of the product 7 to be tested.

As shown in fig. 1 and 2, the vacuum chamber 1 is further connected to an air inlet line 10, a first air suction line 11, and a second air suction line 12. The air inlet pipeline 10 comprises a first interface 13 arranged on the vacuum chamber 1 and a first valve 16 with one end connected with the first interface 13, the other end of the first valve 16 is connected with a first fine tuning valve 19, and the other end of the first fine tuning valve 19 is communicated with the atmosphere. The first air suction pipeline 11 comprises a second interface 14 arranged on the vacuum chamber 1, and a second valve 17 with one end connected with the second interface 14, the other end of the second valve 17 is connected with a three-way pipe 21, and the three-way pipe 21 is connected with the second valve 17 through a first end. The second pumping line 12 includes a third port 15 disposed on the vacuum chamber 1, and a third valve 18 having one end connected to the third port 15, the other end of the third valve 18 is connected to a second trim valve 20, and the other end of the second trim valve 20 is connected to a second end of the tee 21. The third end of the three-way pipe 21 is connected with the air extractor 2.

As shown in fig. 1, preferably, the air extractor 2 includes a mechanical pump 23, a molecular pump 24, a three-way reversing valve 22, and a switch valve 25, an input end of the three-way reversing valve 22 is connected to a third end of the three-way pipe 21, a first output end of the three-way reversing valve 22 is connected to an input end of the mechanical pump 23, a second output end of the three-way reversing valve 22 is connected to an input end of the molecular pump 24, an output end of the molecular pump 24 is connected to an input end of the switch valve 25, an output end of the switch valve 25 is connected to an input end of the mechanical pump 23, and an output end of the mechanical pump 23 is communicated. When the passage of the three-way reversing valve 22 is the input end and the first output end, the mechanical pump 23 can pre-pump the vacuum chamber 1 as a low vacuum pump, so that the vacuum chamber 1 reaches a rough vacuum state, and the pre-pumping by the mechanical pump 23 has the advantages of large flow and high speed. When the paths of the three-way reversing valve 22 are the input end and the second output end, the mechanical pump 23 serves as a backing pump of the molecular pump 24, the molecular pump 24 is a high-vacuum pump, the mechanical pump 23 provides an operating environment for the molecular pump 24 (i.e. the operating pressure of the molecular pump 24 is reached, in this embodiment, 6.6pa or less), and the molecular pump 24 is used for further evacuating the vacuum chamber 1. Of course, the above-described manner of the suction device 2 is only one preferred solution. The vacuum air extractor set in the prior art can achieve high vacuum.

The principle of the embodiment is as follows: if the vacuum chamber 1 needs to be pressurized, the first valve 16 and the first trim valve 19 can be opened in sequence to realize pressurization, and the pressurization amount is controlled through the first trim valve 19, so that the pressure in the vacuum chamber 1 can be conveniently regulated. The vacuum chamber 1 can be evacuated by connecting the evacuation device 2 via the first evacuation line 11 and the second evacuation line 12 in the event of an overpressure in the vacuum chamber 1. When the required vacuum degree is large, the second valve 17, the third valve 18 and the second trim valve 20 can be opened simultaneously, and air suction is performed synchronously. When the required vacuum degree is smaller, the second valve 17 is closed, the second pumping line 12 pumps air, and the second trim valve 20 is used to control the pumping amount, so that the pressure regulation of the vacuum chamber 1 is more accurate. The accuracy of the pressure regulation and control of the vacuum chamber 1 is improved, and the measurement result of the reference table 6 is combined, so that the accuracy of the judgment of the test result of the product 7 to be tested is improved.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. A pressure transmitter test system comprising a vacuum chamber (1), characterized in that: the device is characterized by further comprising an air extracting device (2), wherein a test interface (4) used for connecting a product to be tested (7) and a connecting interface (5) used for connecting a reference meter (6) are arranged on the vacuum chamber (1), and the vacuum chamber (1) is further connected with an air inlet pipeline (10), a first air extracting pipeline (11) and a second air extracting pipeline (12);

the air inlet pipeline (10) comprises a first interface (13) arranged in the vacuum chamber (1) and a first valve (16) with one end connected with the first interface (13), the other end of the first valve (16) is connected with a first fine tuning valve (19), and the other end of the first fine tuning valve (19) is communicated with the atmosphere;

the first air suction pipeline (11) comprises a second interface (14) arranged on the vacuum chamber (1), a second valve (17) with one end connected with the second interface (14), and the other end of the second valve (17) is connected with the air suction device (2);

the second air pumping pipeline (12) comprises a third interface (15) arranged in the vacuum chamber (1), a third valve (18) with one end connected with the third interface (15), the other end of the third valve (18) is connected with a second fine adjustment valve (20), and the other end of the second fine adjustment valve (20) is connected with the air pumping device (2).

2. The pressure transmitter testing system of claim 1, wherein: the device is characterized by further comprising a console (3), wherein the console (3) is provided with a reference display (8) which is connected with the reference meter (6) and used for displaying the measurement data of the reference meter (6).

3. The pressure transmitter testing system of claim 2, wherein: the control console (3) is provided with a to-be-tested display (9) which is used for being connected with the to-be-tested product (7) and displaying the measurement data of the to-be-tested product (7).

4. The pressure transmitter testing system of claim 1, wherein: the three-way valve is characterized by further comprising a three-way pipe (21), wherein the first end of the three-way pipe (21) is connected with one end, far away from the second connector (14), of the second valve (17), the second end of the three-way pipe (21) is connected with one end, far away from the third valve (18), of the second fine adjustment valve (20), and the third end of the three-way pipe (21) is connected with the air suction device (2).

5. The pressure transmitter testing system of claim 4, wherein: the air extracting device (2) comprises a mechanical pump (23), a molecular pump (24), a three-way reversing valve (22) and a switch valve (25), wherein the input end of the three-way reversing valve (22) is connected with the third end of the three-way pipe (21), the first output end of the three-way reversing valve (22) is connected with the input end of the mechanical pump (23), the second output end of the three-way reversing valve (22) is connected with the input end of the molecular pump (24), the output end of the molecular pump (24) is connected with the input end of the switch valve (25), the output end of the switch valve (25) is connected with the input end of the mechanical pump (23), and the output end of the mechanical pump (23) is communicated with the atmosphere.

6. The pressure transmitter testing system of claim 1, wherein: the number of the test interfaces (4) is multiple.

7. The pressure transmitter testing system of claim 6, wherein: the number of the test interfaces (4) is 10.

8. The pressure transmitter testing system of claim 1, wherein: the number of the connecting interfaces (5) is multiple.

9. The pressure transmitter testing system of claim 8, wherein: the number of the connecting interfaces (5) is 3.