Low-temperature valve

Abstract

The utility model relates to the technical field of valve design, and discloses a low-temperature valve which comprises a low-temperature valve seat, a long-neck valve cover is fixedly installed at the upper end of the low-temperature valve seat, an integrated controller is fixedly installed at the upper end of the long-neck valve cover, a valve rod is arranged in the integrated controller, and a valve rod is arranged in the valve rod. The lower end of the valve rod penetrates through the long-neck valve cover and extends into the low-temperature valve seat, the lower end of the valve rod is fixedly connected with a valve element in the low-temperature valve seat, a vacuum cavity is formed in the valve element, a hollow groove is formed in the middle of the valve rod, and the hollow groove communicates with the vacuum cavity; the upper end of the valve rod is sleeved with a detachable sealing connecting piece in a threaded mode. According to the utility model, the vacuum cavity in the valve core is quickly vacuumized, the heat conduction is greatly reduced, the cold impact effect caused by direct contact of low-temperature media is relieved, the material stress is reduced, and a low-temperature gas layer is formed by filling a proper amount of liquid nitrogen or nitrogen into the liquid nitrogen chamber.

Description

Technical Field

[0001] The utility model relates to the technical field of valve design, in particular to a low-temperature valve. Background Art

[0002] In the aerospace field, with the advancement of deep space exploration and space station construction, more stringent requirements are placed on the performance of equipment used on spacecraft, especially key components such as valves. As an indispensable part of aerospace systems, cryogenic valves are widely used in the storage and transportation systems of ultra-low temperature fuels such as liquid oxygen and liquid hydrogen. These valves not only need to withstand extreme temperature environments (-253℃ to -196℃ or even lower), but also need to ensure stable and reliable operation under complex conditions such as high vacuum, strong radiation and microgravity.

[0003] When dealing with extreme low temperature conditions, traditional cryogenic valves often face problems such as excessively high heat conduction efficiency, material stress concentration caused by cold shock, and damage to internal valve components due to sudden temperature changes. In particular, in key components such as valve stems and valve cores, due to direct contact with low-temperature media, heat conduction becomes the main way of heat transfer, which seriously affects the thermal insulation performance and long-term reliability of the valve. In addition, the sealing problem between the valve stem and the stuffing box is often aggravated by changes in material properties caused by low temperature, increasing the risk of leakage.

[0004] In order to overcome the above technical difficulties and improve the applicability and reliability of cryogenic valves in the aerospace field, there is an urgent need for an innovatively designed cryogenic valve that can effectively reduce the impact of heat conduction and heat convection on valve performance, while enhancing the valve's thermal insulation capacity, reducing material stress caused by temperature changes, and ensuring the valve's stable operation in extreme environments. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a low-temperature valve, which has the advantage of reducing the cold impact of the low-temperature medium on the valve stem and valve core, and solves the above-mentioned problems.

[0006] The utility model provides the following technical solutions: a low-temperature valve, comprising a low-temperature valve seat, a long-necked valve cover is fixedly mounted on the upper end of the low-temperature valve seat, an integrated controller is fixedly mounted on the upper end of the long-necked valve cover, a valve stem is arranged inside the integrated controller, the lower end of the valve stem passes through the long-necked valve cover and extends to the interior of the low-temperature valve seat, the lower end of the valve stem is fixedly connected with a valve core inside the low-temperature valve seat, a vacuum chamber is arranged inside the valve core, a hollow groove is arranged in the middle of the valve stem, the hollow groove is communicated with the vacuum chamber, a detachable sealing connector is threadedly sleeved on the upper end of the valve stem, a detachable vacuum tube is threadedly connected to the end of the sealing connector away from the valve stem, and a small vacuum pump is fixedly mounted on the end of the vacuum tube away from the sealing connector.

[0007] Furthermore, a one-way air valve is arranged inside the hollow groove near the upper side.

[0008] Furthermore, a liquid nitrogen chamber is fixedly sleeved on the outer wall of the long-necked valve cover, the interior of the liquid nitrogen chamber is filled with liquid nitrogen, a connecting port is provided at the left end of the liquid nitrogen chamber near the upper side, and a detachable sealing flange is fixedly installed at the left end of the connecting port.

[0009] Furthermore, a two-way air valve is provided at the rear end of the connection port, and the outer side of the liquid nitrogen chamber is wrapped with a fitting insulation sleeve.

[0010] Furthermore, the outer side of the valve stem is movably sleeved with multiple groups of flexible graphite gaskets near the upper end of the inner side of the long-necked valve cover.

[0011] Furthermore, a hand wheel is fixedly sleeved on the outer side of the valve stem at the upper side of the integrated controller.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. Through the intelligent control of the small vacuum pump by the integrated controller, the utility model realizes the rapid evacuation of the vacuum chamber in the valve core, thereby forming a vacuum environment inside the valve stem and the valve core. Vacuum, as a poor conductor of heat, greatly reduces the occurrence of heat conduction. At the same time, heat convection is also completely suppressed in the vacuum state. This dual effect significantly reduces the heat transferred from the low-temperature medium to the inside of the valve, effectively alleviates the cold shock effect caused by the direct contact of the valve stem with the low-temperature medium, and reduces the generation of material stress. This innovative design not only improves the stability and reliability of the valve, but also extends the service life of the valve. It is particularly suitable for extreme low-temperature environments such as aerospace and deep cold storage.

[0014] 2. The liquid nitrogen chamber designed on the outside of the long-necked valve cover of the utility model provides an additional thermal insulation layer for the valve. By filling a proper amount of liquid nitrogen or nitrogen gas into the liquid nitrogen chamber, a low-temperature gas layer is formed, which effectively blocks the invasion of external heat and further enhances the thermal insulation performance of the valve. At the same time, the circulation or static state of nitrogen in the closed cavity helps to maintain the uniformity of the temperature inside the valve and reduce the thermal stress caused by temperature differences. This is very important for maintaining the low-temperature environment stability of the low-temperature valve seat and the long-necked valve cover. Especially in extreme low-temperature environments, the protective effect of this thermal insulation layer is more prominent, ensuring that the valve can work stably for a long time without being disturbed by the external environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the internal cross-sectional structure of the utility model;

[0017] Figure 3 For the utility model Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0018] Figure 4 It is a partial cross-sectional structural schematic diagram of the utility model.

[0019] In the figure: 1. Low-temperature valve seat; 2. Long-neck valve cover; 3. Integrated controller; 4. Valve stem; 5. Valve core; 6. Vacuum chamber; 7. Hollow groove; 8. One-way air valve; 9. Sealing connector; 10. Vacuum tube; 11. Small vacuum pump; 12. Liquid nitrogen chamber; 13. Connecting port; 14. Two-way air valve; 15. Insulation sleeve; 16. Flexible graphite gasket; 17. Handwheel. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-Figure 4A cryogenic valve comprises a cryogenic valve seat 1, a long-necked valve cover 2 is fixedly mounted on the upper end of the cryogenic valve seat 1, an integrated controller 3 is fixedly mounted on the upper end of the long-necked valve cover 2, a valve stem 4 is arranged inside the integrated controller 3, the lower end of the valve stem 4 passes through the long-necked valve cover 2 and extends to the interior of the cryogenic valve seat 1, a valve core 5 is fixedly connected to the lower end of the valve stem 4 inside the cryogenic valve seat 1, a vacuum chamber 6 is arranged inside the valve core 5, a hollow groove 7 is arranged in the middle of the valve stem 4, the hollow groove 7 is connected with the vacuum chamber 6, a detachable sealing connector 9 is threadedly sleeved on the upper end of the valve stem 4, a detachable vacuum tube 10 is threadedly connected to the end of the sealing connector 9 away from the valve stem 4, a small vacuum pump 11 is fixedly mounted on the end of the vacuum tube 10 away from the sealing connector 9, a one-way gas valve 8 is arranged near the upper side inside the hollow groove 7, the valve stem 4 can be automatically controlled remotely according to instructions or preset programs through the integrated controller 3, so that it drives the valve core 5 to move The valve stem 4 and the valve core 5 are lifted and lowered to achieve the purpose of switching. By adding a control program for the small vacuum pump 11 in the integrated controller 3, the small vacuum pump 11 can be regularly controlled to be opened for vacuuming. Specifically, after the valve stem 4 is connected to the vacuum tube 10 through the sealing connector 9, due to the setting of the hollow groove 7, the vacuum chamber 6 in the valve core 5 can be quickly vacuumed. Vacuum is a poor conductor of heat. When a vacuum is formed inside the valve stem 4 and the valve core 5, the heat transferred to them from the low-temperature medium by heat conduction can be significantly reduced. In a vacuum environment, due to the absence of gas molecules, heat convection cannot occur, which further reduces the transfer of heat inside the valve stem 4 and reduces the degree to which the valve stem 4 is subjected to cold shock from the low-temperature medium, that is, reduces the generation of material stress and improves the stability and reliability of the device. The sealing effect of the vacuum environment can be guaranteed by the setting of the one-way air valve 8.

[0022] See also Figure 2The outer wall of the long-necked valve cover 2 is fixedly sleeved with a liquid nitrogen chamber 12, and the interior of the liquid nitrogen chamber 12 is filled with liquid nitrogen. A connecting port 13 is arranged at the left end of the liquid nitrogen chamber 12 near the upper side, and a detachable sealing flange is fixedly installed at the left end of the connecting port 13. A two-way air valve 14 is arranged at the rear end of the connecting port 13. The outer side of the liquid nitrogen chamber 12 is wrapped with a fitting insulation sleeve 15. The outer side of the valve stem 4 is movably sleeved with multiple groups of flexible graphite gaskets 16 near the upper end of the long-necked valve cover 2. The long-necked valve cover 2 can prevent the flexible graphite gasket 16 in the stuffing box from contacting with the low-temperature medium and freezing, thereby affecting the normal operation of the valve stem 4, and the leakage problem caused by the up and down movement of the valve stem 4 scratching the vacuum chamber 6. Furthermore, the device is designed with a liquid nitrogen chamber 12 on the outer side of the long-necked valve cover 2. After removing the sealing flange on the connecting port 13, it can be The liquid nitrogen filling machine or the like fills the liquid nitrogen chamber 12 with liquid nitrogen or nitrogen gas. It is worth mentioning that the liquid nitrogen cannot be filled, and the specific size needs to be calculated according to the actual size of the container. After being filled with liquid nitrogen, the liquid nitrogen chamber 12 can be used as a heat-insulating layer, which effectively prevents the direct influence of external heat on the device, and helps to maintain the stability of the low-temperature environment inside the cryogenic valve seat 1 and the long-necked valve cover 2. At the same time, the circulation or static state of the low-temperature gas such as nitrogen in the closed cavity can maintain the uniformity of the internal temperature, thereby reducing the thermal stress caused by the temperature difference in various parts of the valve. In addition, the present structure can further slow down the heat conduction speed between the cryogenic valve and the external environment, especially when the valve is in an extremely low-temperature environment. This protective effect is particularly important. The two-way air valve 14 is used for deflation operations during maintenance or other situations, and at the same time plays a sealing role.

[0023] See also Figure 1-Figure 2 The outer side of the valve stem 4 is fixedly sleeved with a hand wheel 17 on the upper side of the integrated controller 3. When a problem occurs in the integrated controller 3, the hand wheel 17 can be used to manually operate the switch, thereby ensuring the rationality of the structure.

[0024] Working principle: The valve stem 4 can be automatically controlled remotely according to instructions or preset programs through the integrated controller 3, so that it drives the valve core 5 to rise and fall to achieve the purpose of switching. By adding a control program for the small vacuum pump 11 in the integrated controller 3, the small vacuum pump 11 can be controlled regularly to open it for vacuuming. Specifically, after the valve stem 4 is connected to the vacuum tube 10 through the sealing connector 9, due to the setting of the hollow groove 7, the vacuum chamber 6 in the valve core 5 can be quickly vacuumed. The sealing effect of the vacuum environment can be guaranteed by the setting of the one-way air valve 8. The long-necked valve cover 2 can prevent the flexible graphite gasket 16 in the stuffing box from contacting and freezing with the low-temperature medium, thereby affecting the normal operation of the valve stem 4, and the up and down movement of the valve stem 4 can scratch the vacuum chamber 6 and cause leakage. Furthermore, the device designs a liquid nitrogen chamber 12 on the outside of the long-necked valve cover 2. After removing the sealing flange on the connecting port 13, the inside of the liquid nitrogen chamber 12 can be filled with liquid nitrogen or nitrogen gas through a liquid nitrogen filling machine.

Claims

1. A cryogenic valve, comprising a cryogenic valve seat (1), characterized in that: A long-necked valve cover (2) is fixedly mounted on the upper end of the low-temperature valve seat (1), an integrated controller (3) is fixedly mounted on the upper end of the long-necked valve cover (2), a valve stem (4) is arranged inside the integrated controller (3), the lower end of the valve stem (4) passes through the long-necked valve cover (2) and extends to the interior of the low-temperature valve seat (1), the lower end of the valve stem (4) is fixedly connected to a valve core (5) inside the low-temperature valve seat (1), a vacuum chamber (6) is arranged inside the valve core (5), a hollow groove (7) is arranged in the middle of the valve stem (4), the hollow groove (7) and the vacuum chamber (6) are connected, a detachable sealing connector (9) is threadedly sleeved on the upper end of the valve stem (4), a detachable vacuum tube (10) is threadedly connected to the end of the sealing connector (9) away from the valve stem (4), and a small vacuum pump (11) is fixedly mounted on the end of the vacuum tube (10) away from the sealing connector (9).

2. A cryogenic valve according to claim 1, characterized in that: A one-way air valve (8) is arranged inside the hollow groove (7) near the upper side.

3. A cryogenic valve according to claim 1, characterized in that: The outer wall of the long-necked valve cover (2) is fixedly sleeved with a liquid nitrogen chamber (12), the interior of the liquid nitrogen chamber (12) is filled with liquid nitrogen, a connecting port (13) is provided at the left end of the liquid nitrogen chamber (12) near the upper side, and a detachable sealing flange is fixedly installed at the left end of the connecting port (13).

4. A cryogenic valve according to claim 3, characterized in that: A two-way gas valve (14) is provided at the rear end of the connection port (13), and a fitting insulation sleeve (15) is wrapped around the outer side of the liquid nitrogen chamber (12).

5. A cryogenic valve according to claim 1, characterized in that: The outer side of the valve stem (4) is movably sleeved with multiple groups of flexible graphite gaskets (16) inside the long-necked valve cover (2) near the upper end.

6. A cryogenic valve according to claim 1, characterized in that: A hand wheel (17) is fixedly sleeved on the outer side of the valve stem (4) at the upper side of the integrated controller (3).

Images