CN218031613U - Negative pressure pipeline working medium negative pressure protection and safety discharge device - Google Patents
Negative pressure pipeline working medium negative pressure protection and safety discharge device Download PDFInfo
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- CN218031613U CN218031613U CN202222142757.7U CN202222142757U CN218031613U CN 218031613 U CN218031613 U CN 218031613U CN 202222142757 U CN202222142757 U CN 202222142757U CN 218031613 U CN218031613 U CN 218031613U
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Abstract
The utility model relates to a negative pressure pipeline working medium negative pressure protection and safe discharge device, include: the two ends of the sealing cover are sealed to form a protection cavity; one end of the ball valve is communicated with the sealing cavity in a sealing mode through a pipeline, and the other end of the ball valve is communicated with a vacuum generating device or a helium gas providing device; one end of the primary safety valve is connected with a pipeline to be protected through a connecting pipeline, and the primary safety valve has a first tripping pressure. The negative pressure pipeline working medium negative pressure protection and safety relief device can be used for negative pressure protection of a connecting position of a helium low-temperature transmission pipeline exposed in air and provides protection for pipelines in overpressure.
Description
Technical Field
The utility model relates to a large-scale superfluid helium cryogenic refrigeration technical field especially relates to a negative pressure pipeline working medium negative pressure protection and safe relief device.
Background
Generally, in a large-scale super-flow helium cryogenic refrigeration system, a helium cryogenic transmission pipeline is responsible for transmitting a cryogenic working medium from a refrigerator to a load end, recovering cold energy and completing closed circulation. The saturation pressure of 2K saturated super-current helium is 3129Pa, far below atmospheric pressure, and like this in the operation process, air will invade the cryogenic line through connecting part, influences the purity of helium, and then causes serious influence to whole cryogenic system's working property. In addition, the pressure in the negative pressure pipeline fluctuates dynamically along with the change of the working environment, and if the valve is accidentally closed, the pipeline pressure is increased, and the danger of explosion is also caused, so that the pipeline needs to be decompressed in time.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is an object of the present invention to provide a negative pressure pipeline working medium negative pressure protection and safety relief device, which can be used for the negative pressure protection of the connecting position of helium low-temperature transmission pipeline exposed in the air, and provide protection for the pipeline when in overpressure.
In order to achieve the purpose, the utility model adopts the following technical proposal:
an aspect of the utility model provides a negative pressure pipeline working medium negative pressure protection and safe relief device, include:
the two ends of the sealing cover are sealed to form a protection cavity;
one end of the ball valve is communicated with the inside of the protection cavity in a sealing mode through a pipeline, and the other end of the ball valve is communicated with a vacuum generating device or a helium gas providing device;
one end of the first-stage safety valve is connected with a pipeline to be protected through a connecting pipeline, and the first-stage safety valve has a first jump pressure.
The device further comprises a secondary safety valve, one end of the secondary safety valve is communicated with the protection cavity through a pipeline, the other end of the secondary safety valve is communicated with the recovery and purification system, the secondary safety valve has a second tripping pressure, and the second tripping pressure is greater than the first tripping pressure.
The protection device further comprises a blasting assembly, wherein one end of the blasting assembly is communicated with the pipeline to be protected through a pipeline, the blasting assembly has a third take-off pressure, and the third take-off pressure is greater than the second take-off pressure.
The blasting assembly is characterized by further comprising a three-way valve, wherein a first end of the three-way valve is communicated with the pipeline to be protected through a pipeline, a second end of the three-way valve is communicated with the primary safety valve through a pipeline, and a third end of the three-way valve is communicated with the blasting assembly through a pipeline.
Further, the seal cover includes barrel, head, seal cover flange and base flange, the head is used for sealing the top of barrel, the seal cover welding is in the bottom of barrel, the base flange with seal cover flange fixed connection is used for sealing the bottom of barrel.
Furthermore, a helium leakage detecting opening is further formed in the base flange and used for detecting the helium leakage condition in the protection cavity.
Further, the primary safety valve comprises a first valve body, a first air inlet, a first exhaust port, a first valve core and a first trip controller, the first air inlet, the first exhaust port, the first valve core and the first trip controller are arranged on the first valve body, the first air inlet is communicated with the connecting pipeline, helium is discharged into the protection cavity through the first exhaust port, and the first trip controller is used for controlling the first valve core to trip according to the pressure condition of the pipeline to be protected.
Further, the secondary safety valve comprises a second valve body, and a second air inlet, a second air outlet, a second valve core and a second jump controller which are arranged on the second valve body, wherein the second air inlet is communicated with the protection cavity, the second air outlet is communicated with the recovery and purification system, and the second jump controller is used for controlling the first valve core to jump according to the pressure condition in the protection cavity.
Furthermore, a sealing ring is arranged between the base flange and the sealing cover flange in a pressing mode.
The utility model discloses owing to take above technical scheme, it has following advantage:
1. the utility model provides a negative pressure pipeline working medium negative pressure protection and safe bleeder mechanism will supply with the same helium (99.999%) of purity in the system to the sealed cowling barrel of above-mentioned negative pressure pipeline working medium negative pressure protection and safe bleeder subassembly through the ball valve, when the pipeline negative pressure operation, the helium in the sealed cowling barrel passes through during the relief valve connecting thread is inhaled low temperature transmission pipeline, because by inspiratory helium volume is very little, and helium purity between them is the same, just avoided the air to cause the pollution to the helium circulation environment in the pipeline effectively.
2. When the pressure of the pipeline is too high in the process of stroke, the primary safety valve jumps, a small amount of helium can be stored in the cylinder of the sealing cover, and when the pressure continues to increase, the secondary safety valve jumps. When the safety valve fails, the rupture disk is broken open, the pressure is released to the atmosphere, a parallel protection mechanism is formed, and the reliability of the safety discharge system is improved. The safe exhaust helium is discharged into a recovery system to form closed cycle recovery, so that the waste of the helium and the pollution of the local environment are avoided.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Like reference numerals refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic view of an angle structure of a negative pressure protection and safety relief device for working medium in a negative pressure pipeline according to an embodiment;
FIG. 2 is a schematic structural view of the working medium negative pressure protection and safety relief device at another angle;
FIG. 3 is a schematic structural diagram of the negative pressure pipeline working medium negative pressure protection and safety relief device after the sealing cover is removed;
FIG. 4 is a schematic view of the construction of the base flange;
fig. 5 is a schematic view of the structure of the primary safety valve.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The embodiment of the utility model provides a negative pressure pipeline working medium negative pressure protection and safety relief device, which comprises a sealing cover, a ball valve and a primary safety valve, wherein two ends of the sealing cover are sealed to form a protection cavity; one end of the ball valve is hermetically communicated with the inside of the sealing cavity through a pipeline, and the other end of the ball valve is communicated with a vacuum generating device or a helium gas supply device; one end of the primary safety valve is connected with a pipeline to be protected through a connecting pipeline, and the primary safety valve has a first jump pressure. The negative pressure pipeline working medium negative pressure protection and safety relief device can be used for negative pressure protection at the connecting position of the helium low-temperature transmission pipeline exposed in the air and provides protection for pipelines under overpressure.
Example 1
As shown in fig. 1-5, the negative pressure protection and safety relief device for working medium in the negative pressure pipeline comprises a sealing cover 1, a ball valve 2 and a primary safety valve 8, wherein two ends of the sealing cover 1 are sealed to form a protection cavity. One end of the ball valve 2 is hermetically communicated with the inside of the protection cavity through a pipeline, and the other end of the ball valve 2 is communicated with a vacuum generation device or a helium gas supply device through an interface 3; one end of the primary safety valve 8 is connected with a pipeline to be protected (not shown in the figure) through the connecting pipeline 4, and the primary safety valve 8 has a first jump-up pressure.
When the negative pressure protection and safety relief device for the working medium of the negative pressure pipeline is used for negative pressure protection, the ball valve 2 is opened, the protection cavity is vacuumized through the vacuum generating device, the vacuum generating device stops when the vacuum degree reaches a set value, helium is filled into the protection cavity, and the purity of the helium is the same as that of the helium in the pipeline to be protected.
When the pipeline to be protected operates at negative pressure, helium in the sealing cover 1 is sucked into the low-temperature transmission pipeline through the safety valve connecting thread, and due to the fact that the amount of the sucked helium is small and the purity of the helium is the same, pollution of air to a helium circulating environment in the pipeline is effectively avoided. Therefore, the negative pressure pipeline working medium negative pressure protection and safety relief device can be used for negative pressure protection of the connection position of the helium low-temperature transmission pipeline exposed in the air.
When the pressure of the pipeline to be protected is overhigh in the process of travel, the primary safety valve 8 jumps, a small amount of helium can be stored in the sealing cover 1, and then the pressure of the low-temperature transmission pipeline is relieved, and overpressure protection is provided.
Further, in order to make overpressure protection more reliable, the negative pressure pipeline working medium negative pressure protection and safety relief device further comprises a secondary safety valve 7, one end of the secondary safety valve 7 is communicated with the protection cavity through a pipeline, the other end of the secondary safety valve is communicated with a recovery and purification system (not shown in the figure), and the secondary safety valve 7 has a second tripping pressure which is greater than the first tripping pressure.
When the pressure of the pipeline to be protected is too high in the stroke process, the pipeline to be protected is connected with the connecting pipeline 4 in parallel, the pipeline to be protected and the connecting pipeline 4 have the same pressure, the pressure in the pipeline 4 to be protected is transmitted to the primary safety valve 8 through the protected pipeline leading-out pipe, when the pressure in the pipeline is overpressure and is larger than the set value of the primary safety valve 8, the primary safety valve 8 jumps, the gas is exhausted into the protection cavity through the safety valve exhaust port, when the overpressure continues in the pipeline, the gas is continuously exhausted into the protection cavity, and when the pressure in the protection cavity continuously rises and is larger than the set value of the secondary safety valve 7, the secondary safety valve 7 jumps, and the helium gas in the protection cavity is exhausted to the recovery and purification system through the safety valve exhaust port.
Further, the protection device further comprises a blasting assembly 6, one end of the blasting assembly 6 is communicated with the pipeline to be protected through a pipeline, the blasting assembly 6 has a third take-off pressure, and the third take-off pressure is greater than the second take-off pressure.
When the first-stage safety valve 8 or the second-stage safety valve 7 fails to break down and cannot jump in time, the blasting component 6 jumps slightly higher than the jump-out pressure of the second-stage safety valve 7 when the jump-out pressure of the blasting component 6 is reached, the blasting component 6 jumps and releases pressure by exhausting air to the atmosphere, and safety accidents caused by continuous increase of the pressure in the protection cavity and the pipeline to be protected are avoided.
The working medium negative pressure protection and safety discharge assembly for the negative pressure pipeline is simple in installation mode and convenient to operate, and installation of the working medium negative pressure protection and safety discharge assembly for the negative pressure pipeline is achieved through threads and flange connection. When the safety valve needs to reset after jumping or the rupture disk needs to be replaced after jumping, the reset of the safety valve and the replacement of the rupture disk can be completed by disassembling the screw and the flange.
In order to facilitate installation and connection, the negative pressure pipeline working medium negative pressure protection and safety relief device comprises a three-way valve 5, wherein a first end of the three-way valve 5 is communicated with the pipeline to be protected through a pipeline, a second end of the three-way valve is communicated with the primary safety valve 8 through a pipeline, and a third end of the three-way valve is communicated with the blasting assembly 6 through a pipeline.
In order to improve the sealing reliability of the sealing cover, the sealing cover comprises a cylinder body 11, a seal head 12, a sealing cover flange 13 and a base flange 14, wherein the seal head 12 is used for sealing the top of the cylinder body 11, the sealing cover 13 is welded at the bottom of the cylinder body 11, and the base flange 14 is fixedly connected with the sealing cover flange 13 and used for sealing the bottom of the cylinder body 11. The base flange 14 is provided with a mounting hole 142, and the connecting pipeline 4 passes through the mounting hole 142 and is connected with the primary safety valve 8.
In order to improve the sealing performance of the protection cavity, a helium leakage detecting opening 142 is further formed in the base flange 14, and the helium leakage detecting opening 142 is used for detecting the helium leakage condition in the protection cavity.
The base flange 14 is further provided with a helium leakage detecting opening 141, and the helium leakage detecting opening 141 is used for detecting the helium leakage condition in the protection cavity. The helium leakage detecting openings 141 may be provided in two numbers, and the two helium leakage detecting openings 141 are symmetrically provided at both sides of the base flange 14.
The primary safety valve 8 comprises a first valve body, and a first air inlet 81, a first exhaust port 82, a first valve core 83 and a first jump controller 84 which are arranged on the first valve body, wherein the first air inlet 81 is communicated with the connecting pipeline 4, the first exhaust port 82 discharges helium gas into the protective cavity, and the first jump controller 84 is used for controlling the first valve core 83 to jump according to the pressure condition of the pipeline to be protected.
The secondary safety valve 7 comprises a second valve body, and a second air inlet 71, a second air outlet 72, a second valve spool 73 and a second bounce controller 74 which are arranged on the second valve body, wherein the second air inlet 71 is communicated with the protection cavity, the second air outlet 72 is communicated with the recovery and purification system, and the second bounce controller 74 is used for controlling the first valve spool 73 to bounce according to the pressure condition in the protection cavity.
Based on negative pressure pipeline working medium negative pressure protection and safe discharge device, including the step:
opening the ball valve 2, and closing the primary safety valve 8, the secondary safety valve 7 and the blasting assembly 6;
vacuumizing the protection cavity through the ball valve 2, and stopping when the vacuum degree reaches a set value;
helium is filled into the protection cavity through the ball valve 2, and the purity of the helium is the same as that of the helium in the pipeline to be protected;
when negative pressure is formed in the pipeline to be protected, helium in the protection cavity enters the pipeline to be protected with the negative pressure;
when the pressure of the pipeline to be protected is greater than the first jump-up pressure, the primary safety valve 8 jumps up and moves to exhaust gas into the protection cavity through the first exhaust port 82;
when the pressure in the protection cavity is higher than the second jump pressure of the secondary safety valve 7, exhausting gas to the recovery and purification system through the second gas exhaust 72;
when the primary safety valve 8 or the secondary safety valve 7 fails to jump in time and reaches the third jump-starting pressure of the blasting assembly 6, the blasting piece jumps and exhausts to the atmosphere for pressure relief.
The utility model provides a negative pressure pipeline working medium negative pressure protection and safe relief device can be used for helium low temperature transmission line to expose in the negative pressure protection of the hookup location department of air to provide the protection when for the pipeline superpressure.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The utility model provides a negative pressure pipeline working medium negative pressure protection and safe discharge device which characterized in that includes:
the two ends of the sealing cover are sealed to form a protection cavity;
one end of the ball valve is communicated with the inside of the protection cavity in a sealing mode through a pipeline, and the other end of the ball valve is communicated with a vacuum generating device or a helium gas providing device;
one end of the first-stage safety valve is connected with a pipeline to be protected through a connecting pipeline, and the first-stage safety valve has a first jump pressure.
2. The negative pressure pipeline working medium negative pressure protection and safety relief device according to claim 1, further comprising a secondary safety valve, one end of the secondary safety valve is communicated with the protection cavity through a pipeline, the other end of the secondary safety valve is communicated with the recovery and purification system, the secondary safety valve has a second tripping pressure, and the second tripping pressure is greater than the first tripping pressure.
3. The negative pressure pipeline working medium negative pressure protection and safety relief device according to claim 2, further comprising a blasting assembly, wherein one end of the blasting assembly is communicated with the pipeline to be protected through a pipeline, the blasting assembly has a third take-off pressure, and the third take-off pressure is greater than the second take-off pressure.
4. The negative pressure pipeline working medium negative pressure protection and safety relief device according to claim 3, comprising a three-way valve, wherein a first end of the three-way valve is communicated with the pipeline to be protected through a pipeline, a second end of the three-way valve is communicated with the primary safety valve through a pipeline, and a third end of the three-way valve is communicated with the blasting assembly through a pipeline.
5. The negative pressure pipeline working medium negative pressure protection and safety relief device according to claim 2, wherein the sealing cover comprises a cylinder, a sealing head, a sealing cover flange and a base flange, the sealing head is used for sealing the top of the cylinder, the sealing cover is welded at the bottom of the cylinder, and the base flange is fixedly connected with the sealing cover flange and used for sealing the bottom of the cylinder.
6. The negative pressure pipeline working medium negative pressure protection and safety relief device according to claim 5, wherein a helium gas leak detection port is further provided on the base flange, and the helium gas leak detection port is used for detecting a helium gas leak condition in the protection cavity.
7. The negative pressure pipeline working medium negative pressure protection and safety relief device according to claim 6, wherein the primary safety valve comprises a first valve body, and a first air inlet, a first exhaust port, a first valve core and a first trip controller which are arranged on the first valve body, the first air inlet is communicated with the connecting pipeline, the first exhaust port discharges helium gas into the protection cavity, and the first trip controller is used for controlling the first valve core to trip according to the pressure condition of the pipeline to be protected.
8. The negative pressure pipeline working medium negative pressure protection and safety relief device according to claim 7, wherein the secondary safety valve comprises a second valve body, and a second air inlet, a second air outlet, a second valve core and a second bounce controller which are arranged on the second valve body, the second air inlet is communicated with the protection cavity, the second air outlet is communicated with the recovery and purification system, and the second bounce controller is used for controlling the bounce of the first valve core according to the pressure condition in the protection cavity.
9. The negative pressure pipeline working medium negative pressure protection and safety relief device according to claim 5, wherein a sealing ring is further pressed between the base flange and the sealing cover flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222142757.7U CN218031613U (en) | 2022-08-15 | 2022-08-15 | Negative pressure pipeline working medium negative pressure protection and safety discharge device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222142757.7U CN218031613U (en) | 2022-08-15 | 2022-08-15 | Negative pressure pipeline working medium negative pressure protection and safety discharge device |
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| Publication Number | Publication Date |
|---|---|
| CN218031613U true CN218031613U (en) | 2022-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222142757.7U Active CN218031613U (en) | 2022-08-15 | 2022-08-15 | Negative pressure pipeline working medium negative pressure protection and safety discharge device |
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| CN (1) | CN218031613U (en) |
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- 2022-08-15 CN CN202222142757.7U patent/CN218031613U/en active Active
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