CN215004261U

CN215004261U - Low-temperature safety valve calibration stand

Info

Publication number: CN215004261U
Application number: CN202121326532.6U
Authority: CN
Inventors: 尹强
Original assignee: Beijing Langyao Technology Co ltd
Current assignee: Beijing Langyao Technology Co ltd
Priority date: 2021-06-15
Filing date: 2021-06-15
Publication date: 2021-12-03
Anticipated expiration: 2031-06-15

Abstract

The utility model relates to a low temperature safety valve calibration stand, including low temperature pressure source, pressure buffer, temperature isolating device, relief valve and manometer to be surveyed, the low temperature pressure source is connected with pressure buffer, pressure buffer all is connected with relief valve and temperature isolating device to be surveyed, pressure buffer provides pressure for relief valve and temperature isolating device to be surveyed with the same pressure simultaneously, the manometer sets up on temperature isolating device, the utility model discloses a medium and pressure that pressure buffer checked the usefulness monitor the calibration pressure, be used for judging whether to satisfy the calibration requirement; liquid nitrogen and a pressure gauge are separated through the gravity of the temperature isolating device, so that the normal working temperature of the pressure gauge is ensured.

Description

Low-temperature safety valve calibration stand

Technical Field

The utility model relates to a relief valve check-up technical field, concretely relates to low temperature relief valve check-up table.

Background

At present, the low-temperature equipment for industrial production is various, and the low-temperature working condition safety valves are large in quantity and various in variety. The verification of the low-temperature safety valve needs to be carried out by using a low-temperature medium (liquid nitrogen) so as to simulate the actual working environment. The traditional low-temperature calibration equipment utilizes the pressure generated by natural evaporation of liquid nitrogen to calibrate the safety valve, the evaporation container is large in size, the natural evaporation pressure-increasing speed is slow, the maximum pressure-increasing pressure is influenced by the ambient temperature, and the safety valve is difficult to accurately control. The actual safety valve check medium after the liquid nitrogen is evaporated is nitrogen, the safety valve cannot be fully cooled by the check, and the actual working condition of the safety valve cannot be well simulated.

Disclosure of Invention

The utility model aims at providing a low-temperature safety valve calibration stand, which monitors the calibration pressure through the medium and pressure for calibration of a pressure buffer device, and is used for judging whether the calibration requirement is met; liquid nitrogen and a pressure gauge are separated through the gravity of the temperature isolating device, so that the normal working temperature of the pressure gauge is ensured.

The utility model aims at realizing through the following technical scheme: the low-temperature pressure source is connected with the pressure buffering device, the pressure buffering device is connected with the safety valve to be tested and the temperature isolating device, the pressure buffering device provides pressure for the safety valve to be tested and the temperature isolating device at the same time with the same pressure, and the pressure gauge is arranged on the temperature isolating device.

In a preferred embodiment, the cryogenic pressure source comprises a nitrogen pressure source and a liquid nitrogen pressure source.

In a preferred embodiment, the pressure buffering device is provided with a safety valve and a buffering pressure gauge.

In a preferred embodiment, a first evacuation port is provided on the pressure buffer device.

In a preferred embodiment, a second evacuation port is disposed at the bottom of the temperature isolation device.

In a preferred embodiment, the pressure gauge comprises a first check pressure gauge and a second check pressure gauge which are connected in sequence.

In a preferred embodiment, the safety valve to be tested is arranged on the holding device.

In a preferred embodiment, a third evacuation port communicated with the tested safety valve is arranged on the clamping device.

In a preferred embodiment, the inner walls of the pressure buffering device and the temperature isolating device are both provided with insulating layers.

The utility model has the advantages that:

1. storing a medium and pressure for verification through a pressure buffer device, and monitoring the verification pressure to judge whether the verification requirement is met;

2. liquid nitrogen and a pressure gauge are separated through the gravity of the temperature isolating device, so that the normal working temperature of the pressure gauge is ensured.

Drawings

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

Fig. 1 is a schematic structural diagram of a low-temperature safety valve calibration stand according to an embodiment of the present invention.

In the figure:

1. a nitrogen pressure source; 2. a liquid nitrogen pressure source; 3. a pressure buffer device; 4. a safety valve to be tested; 5. a temperature isolation device; 6. a clamping device; 7. a first valve; 8. a second valve; 9. a safety valve; 10. a buffer pressure gauge; 11. a first evacuation port; 12. a third valve; 13. a heat-insulating layer; 14. a second evacuation port; 15. a seventh valve; 16. a third evacuation port; 17. a fifth valve; 18. a fourth valve; 19. a first calibration pressure gauge; 20. a second check pressure gauge; 21. and a sixth valve.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

The invention will be further described with reference to the drawings and specific examples.

As shown in fig. 1, the utility model discloses a low temperature safety valve check table, including low temperature pressure source, pressure buffer 3, temperature isolating device 5, surveyed relief valve 4 and manometer, low temperature pressure source is connected with pressure buffer 3, stores medium and pressure that the check-up was used, and pressure buffer 3 all is connected with surveyed relief valve 4 and temperature isolating device 5, and pressure buffer 3 uses the same pressure to provide pressure for being surveyed relief valve 4 and temperature isolating device 5 simultaneously, and the output of 2 bottoms of pressure buffer is connected with an output tube, is equipped with fourth valve 18 on the output tube, and the other end of output tube divides two branch roads and is connected with being surveyed relief valve 4 and temperature isolating device 5 respectively, the manometer sets up on temperature isolating device 5.

The low temperature pressure source includes a nitrogen pressure source 1 and a liquid nitrogen pressure source 2. The outlets of the nitrogen pressure source 1 and the liquid nitrogen pressure source 2 are respectively provided with a first valve 7 and a second valve 8. The nitrogen pressure source 1 is a nitrogen tank for providing pressure for verification, and the liquid nitrogen pressure source 2 is a liquid nitrogen tank for providing a medium for verification.

The pressure buffer device 3 is provided with a safety valve 9 and a buffer pressure gauge 10. The pressure buffer device 3 is a liquid nitrogen storage tank, and the safety valve 9 ensures that the pressure in the pressure buffer device 3 is within a safety range; the buffer pressure gauge 10 monitors the pressure in the pressure buffer device 3 to judge whether the check requirement is met.

The pressure buffer device 3 is provided with a first vent 11. For evacuating the pressure in the pressure buffer device 3, a third valve 12 is arranged at the first evacuation port 11.

The bottom of the temperature isolation device 5 is provided with a second evacuation port 14. The second evacuation port 14 is provided with a seventh valve 15.

The temperature isolation device 5 is a liquid nitrogen isolation tank and isolates liquid nitrogen from the pressure gauge through gravity, so that the normal working temperature of the pressure gauge is ensured; meanwhile, due to the existence of the liquid nitrogen isolation tank, the internal volume of the checking pipeline is increased, the pressure fluctuation in the system caused by unstable medium flow can be buffered, and the checking precision is further improved.

The pressure gauge comprises a first check pressure gauge and a second check pressure gauge which are connected in sequence. The first checking pressure gauge and the second checking pressure gauge are arranged at the top of the temperature isolating device, and a sixth valve is arranged between the first checking pressure gauge and the temperature isolating device. Two check pressure gauges are arranged to enable reading to be more accurate.

The safety valve 4 to be tested is arranged on the clamping device 6. The clamping device 6 is used for fixing the safety valve 4 to be tested and sealing the inlet of the safety valve.

The clamping device 6 is provided with a third evacuation port 16 communicated with the tested safety valve 4. The third emptying port 16 is provided with a fifth valve 17.

The inner walls of the pressure buffer device 3 and the temperature isolation device 5 are both provided with a heat preservation layer 13. The evaporation of liquid nitrogen is reduced, and the pressure fluctuation in the storage tank caused by the change of the ambient temperature is reduced.

The working principle is as follows: liquid nitrogen and high-pressure nitrogen are respectively filled into the pressure buffering device 3. After the verification is started (the fourth valve 18 is opened), the high-pressure nitrogen drives the liquid nitrogen at the bottom in the pressure buffering device 3 to flow to the tested safety valve 4 and the temperature isolating device 5 through the output pipe, part of the liquid nitrogen boils and evaporates into nitrogen in the flowing process and simultaneously cools the tested safety valve 4, and part of the liquid nitrogen flows into the bottoms of the tested safety valve 4 and the temperature isolating device 5. Therefore, the actual checking medium (medium introduced into the inlet of the safety valve) provided by the checking device is a mixture of liquid nitrogen and partially evaporated nitrogen, and is closer to the actual use working condition of the safety valve.

The working mode is as follows:

1. judging whether residual pressure exists in the equipment by reading the buffer pressure gauge 10, and if the pressure is zero, checking and closing all valves; if there is residual pressure, check to close after all valves have closed, open the third valve 12 to exhaust the system pressure and then close.

2. And sequentially opening the third valve 12 and the second valve 8 to enable liquid nitrogen in the liquid nitrogen pressure source 2 to be filled into the pressure buffering device 3, observing the first vent hole 11, and sequentially closing the third valve 12 and the second valve 8 when liquid nitrogen flows out, wherein the pressure buffering device 3 is cooled completely and the liquid nitrogen filling is finished.

3. And opening the first valve 7, injecting the nitrogen pressure source 1 into the pressure buffering device 3, observing the buffering pressure gauge 10, and closing the first valve 7 when the pressure in the pressure buffering device 3 meets the verification requirement.

4. The tested safety valve 4 is clamped and fixed on the clamping device 6, and the sealing between the inlet of the tested safety valve 4 and the clamping device 6 and the stable and firm clamping of the tested safety valve 4 are ensured.

5. After the sixth valve 21 is opened, the fourth valve 18 is slowly opened to slowly increase the pressure of the safety valve 4 to be tested. And observing a first check pressure gauge 19 and a second check pressure gauge 20, wherein when the tested safety valve 4 is opened, the reading of the check pressure gauges is the setting pressure of the tested safety valve 4. And closing the fourth valve 18 and opening the fifth valve 17 to release the pressure of the safety valve 4 to be detected. After the pressure relief is completed, the fifth valve 17 is closed, and the fourth valve 18 is slowly opened to start the second pressure-increasing verification. And (4) after three times of verification, releasing the pressure, and then performing a pressure-retaining sealing test.

6. After the verification work is finished, the tested safety valve 4 is detached from the clamping device 6, the third valve 12 is opened, and the pressure buffering device 3 is decompressed. And closing after pressure relief is finished.

7. After multiple uses, residual liquid in the temperature isolating device 5 can be discharged by opening the seventh valve 15.

Finally, it should be noted that: the above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. The utility model provides a low temperature safety valve check table which characterized in that: the low-temperature pressure source is connected with the pressure buffering device, the pressure buffering device is connected with the safety valve to be tested and the temperature isolating device, the pressure buffering device provides pressure for the safety valve to be tested and the temperature isolating device at the same time with the same pressure, and the pressure gauge is arranged on the temperature isolating device.

2. The cryogenic safety valve verification station of claim 1, wherein: the low temperature pressure source comprises a nitrogen pressure source and a liquid nitrogen pressure source.

3. The cryogenic safety valve verification station of claim 1, wherein: and the pressure buffer device is provided with a safety valve and a buffer pressure gauge.

4. The cryogenic safety valve verification station of claim 3, wherein: and a first exhaust port is arranged on the pressure buffer device.

5. The cryogenic safety valve verification station of claim 1, wherein: and a second emptying port is arranged at the bottom of the temperature isolation device.

6. The cryogenic safety valve verification station of claim 1, wherein: the pressure gauge comprises a first check pressure gauge and a second check pressure gauge which are connected in sequence.

7. The cryogenic safety valve verification station of claim 1, wherein: the safety valve to be tested is arranged on the clamping device.

8. The cryogenic safety valve verification station of claim 7, wherein: and a third evacuation port communicated with the tested safety valve is arranged on the clamping device.

9. The cryogenic safety valve verification station of claim 1, wherein: and the inner walls of the pressure buffer device and the temperature isolation device are both provided with heat insulation layers.