Ultra-low temperature solenoid valve

Abstract

The present invention provides a solenoid valve for ultra-low temperature, comprising a coil assembly, a housing assembly, a valve core assembly, and a valve seat. The housing assembly comprises a housing head and a housing bottom. The coil assembly is sleeved on the outside of the housing head. The housing bottom is provided with an inlet, an outlet, and a pre-cooling discharge port. Vacuum liners are provided inside the inlet, outlet, and pre-cooling discharge port. The housing assembly has a chamber with an open end, the chamber communicating with the inlet, outlet, and pre-cooling discharge port. The valve core assembly is provided at the bottom of the chamber and located between the inlet, outlet, and pre-cooling discharge port. The valve seat is provided in the open end of the chamber. The present invention has a simple structure and is easy to operate. Vacuum liners are provided inside the inlet, outlet, and pre-cooling discharge port, so that the valve is less affected by the cryogenic propellant during the filling and pre-cooling process, and the response characteristics of the coil differ less at different temperatures.

Description

Technical Field

[0001] The present invention relates to the technical field of solenoid valves, and in particular to a solenoid valve for ultra-low temperatures, and in particular to a ultra-low temperature solenoid valve suitable for aerospace applications. Background Art

[0002] With the continuous development of deep space exploration, the use of cryogenic valves is becoming more and more extensive, the demand for them is increasing, and the requirements for their technical performance and working characteristics are also constantly improving.

[0003] Traditional solenoid valve coils are greatly affected by temperature, and their response characteristics vary greatly at different temperatures.

[0004] Patent document CN103939657A discloses an ultra-low temperature solenoid valve comprising a valve body and a solenoid coil. The valve body is provided with a liquid inlet channel, a liquid outlet channel, and a through hole connecting the liquid inlet channel and the liquid outlet channel. A guide hole is provided at the top of the valve body, and a blind hole is provided in the solenoid coil. The solenoid coil is arranged at the top of the guide hole, and the blind hole is connected to the guide hole. A magnetic core is provided in the channel formed by the guide hole and the blind hole. A sealing polytetrafluoroethylene is provided in the groove, and the bottom of the sealing polytetrafluoroethylene is conical, and the conical portion of the sealing polytetrafluoroethylene presses against the top of the through hole. The beneficial effects of this invention are: tight sealing, large flow rate, suitability for occasions with high opening and closing frequencies, sensitive opening and closing action, and ability to achieve remote control. However, the valve body and solenoid coil in this solenoid valve are significantly affected by cryogenic propellants. Summary of the Invention

[0005] In view of the defects in the prior art, the object of the present invention is to provide a solenoid valve for ultra-low temperature use.

[0006] The ultra-low temperature solenoid valve provided by the present invention includes a coil assembly, a housing assembly, a valve core assembly, and a valve seat. The housing assembly includes a housing head and a housing bottom. The coil assembly is sleeved on the outside of the housing head. The housing bottom is provided with an inlet, an outlet, and a pre-cooling discharge port. Vacuum liners are provided inside the inlet, outlet, and pre-cooling discharge port.

[0007] The shell assembly has a built-in chamber, the chamber is connected to an inlet, an outlet and a pre-cooling discharge port, the valve core assembly and the valve seat are sequentially arranged in the chamber, and the valve core assembly is arranged at the bottom of the chamber and is located between the inlet, the outlet and the pre-cooling discharge port.

[0008] Preferably, the ultra-low temperature solenoid valve is a three-way solenoid valve, and an inlet, an outlet and a pre-cooling discharge port are provided on the bottom of the shell.

[0009] Preferably, a filter assembly is provided inside the chamber of the housing assembly, and the filter assembly is provided between the valve core assembly and the inlet, between the valve core assembly and the pre-cooling discharge port, and between the valve core assembly and the outlet.

[0010] Preferably, the coil assembly includes a skeleton, a coil, a cover and a cover plate, and the skeleton is sleeved on the shell assembly;

[0011] The coil is wound on the frame, the cover is sleeved on the outside of the frame and the coil, and the cover is arranged on the end of the cover.

[0012] Preferably, the skeleton is made of non-metallic material, and a plurality of heat dissipation rings arranged circumferentially are arranged in parallel on the cover.

[0013] Preferably, a groove is provided on the outer side of the shell head at a position corresponding to the cavity, a magnetic isolation ring is provided in the groove, and the magnetic isolation ring is located inside the coil assembly.

[0014] Preferably, a slope structure is provided at the cutting edge of the valve seat, and the area of ​​the slope structure on the side close to the valve core assembly is larger than the area on the side away from the valve core assembly.

[0015] Preferably, a pressing block is provided at one end of the shell head, and the pressing block is fixedly connected to the shell head by screws, and the pressing block is used to press the coil assembly.

[0016] Preferably, a boss structure is provided on the head of the shell, one end of the coil assembly is overlapped on the boss structure, and the other end of the coil assembly is pressed by a pressing block.

[0017] Preferably, a spring is provided between the valve core assembly and the bottom of the chamber.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention has a simple structure and is easy to operate. It adopts the technical means of arranging vacuum bushings in the inlet, outlet and pre-cooling discharge port, so that the valve is less affected by the cryogenic propellant during the filling and pre-cooling process.

[0020] 2. The present invention adopts the technical means of a coil assembly with a non-metallic skeleton and a heat dissipation ring, so that the coil assembly is less affected by the low-temperature propellant and has stable response performance.

[0021] 3. The present invention adopts the technical means of setting the valve seat edge as a slope structure, which has reliable sealing performance at low temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 Schematic diagram of the structure of the coil assembly in the present invention;

[0025] Figure 3 Schematic diagram of the structure of the housing assembly in the present invention;

[0026] Figure 4 Schematic diagram of the side structure of the housing assembly of the present invention;

[0027] Figure 5 It is a structural schematic diagram of the valve seat in the present invention.

[0028] The figure shows:

[0029] Coil assembly 1 Housing bottom 23

[0030] Skeleton 11 Vacuum liner 24

[0031] Coil 12 Valve core assembly 3

[0032] Housing 13 Filter assembly 4

[0033] Cover plate 14 Valve seat 5

[0034] Housing assembly 2 Spring 6

[0035] Housing head 21 Pressing block 7

[0036] Magnetic isolation ring 22 Screw 8 DETAILED DESCRIPTION

[0037] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0038] The present invention discloses a solenoid valve for ultra-low temperature use. Compared with the prior art, the solenoid valve is less affected by the cryogenic propellant during the filling and pre-cooling process, the coil assembly is less affected by the cryogenic propellant, the response performance is stable, and the valve has reliable sealing performance at low temperatures.

[0039] According to the ultra-low temperature solenoid valve provided by the present invention, Figure 1-5 As shown, it includes a coil assembly 1, a housing assembly 2, a valve core assembly 3 and a valve seat 5. The housing assembly 2 includes a housing head 21 and a housing bottom 23. The coil assembly 1 is sleeved on the outside of the housing head 21. The housing bottom 23 is provided with an inlet, an outlet and a pre-cooling discharge port. The inlet, outlet and pre-cooling discharge port are all provided with a vacuum liner 24. During the filling and pre-cooling process, the valve is less affected by the cryogenic propellant.

[0040] like Figure 1 、 Figure 3 As shown, the housing assembly 2 has a built-in chamber, and the chamber is connected to the inlet, outlet and pre-cooling discharge port. The valve core assembly 3 and the valve seat 5 are sequentially arranged in the chamber, and the valve core assembly 3 is arranged at the bottom of the chamber and is located between the inlet, outlet and pre-cooling discharge port. A filter assembly 4 is arranged inside the chamber of the housing assembly 2, and the filter assembly 4 is arranged between the valve core assembly 3 and the inlet, between the valve core assembly 3 and the pre-cooling discharge port, and between the valve core assembly 3 and the outlet. A groove is provided on the outside of the housing head 21 at a position corresponding to the chamber, and a magnetic isolation ring 22 is provided in the groove. The magnetic isolation ring 22 is located inside the coil assembly 1, and the outside of the housing head 21 and the outside of the housing bottom 23 are welded together at both ends of the magnetic isolation ring 22. A spring 6 is provided between the valve core assembly 3 and the bottom of the chamber. After the coil assembly 1 is powered off, the valve core assembly 3 is reset by the spring 6. Preferably, the ultra-low temperature solenoid valve is a three-way solenoid valve, and a pre-cooling discharge port, an inlet and an outlet are provided on the bottom 23 of the shell, so as to facilitate the series connection of the system pre-cooling.

[0041] like Figure 2 As shown, the coil assembly 1 includes a skeleton 11, a coil 12, a housing 13, and a cover plate 14. The skeleton 11 is sleeved on the housing assembly 2; the coil 12 is wound around the skeleton 11, the housing 13 is sleeved outside the skeleton 11 and coil 12, and the cover plate 14 is disposed at the end of the housing 13. The skeleton 11 is made of non-metallic material, and the housing 13 is provided with multiple circumferentially arranged heat dissipation rings, which minimize the impact of cryogenic propellants on the coil assembly.

[0042] like Figure 5 As shown, the valve seat 5 is provided with a slope structure at its cutting edge, and the area of ​​the slope structure close to the valve core assembly 3 is larger than the area of ​​the side away from the valve core assembly 3, thereby achieving reliable sealing performance at low temperatures.

[0043] A pressing block 7 is provided at one end of the housing head 21, and the pressing block 7 is fixed to the housing head 21 by a screw 8. The pressing block 7 is used to press the coil assembly 1. A boss structure is provided on the housing head 21, and one end of the coil assembly 1 is overlapped on the boss structure, and the other end of the coil assembly 1 is pressed by the pressing block 7. Preferably, the boss structure is not provided continuously along the circumference, such as Figure 4 As shown, four boss structures are processed on the outside of the shell head 21, so that the contact surface between the shell assembly 2 and the cover shell 13 is smaller, thereby reducing the impact of the propellant on the cover shell.

[0044] Example 1

[0045] In this embodiment, the coil assembly 1 is wound around the coil 12 on the non-metallic skeleton 11, and then put on the cover 13 and then pressed and welded into one with the cover plate 14, and then sealed into one with glue, and the lead wire is used in a throwing wire method; when the entire valve is assembled, the valve core assembly 3 and the spring 6 are first placed in the chamber of the shell assembly 2 in sequence, and then the valve seat 5 is installed, tightened and welded, and then the coil assembly 1 is put on the shell assembly 2, and then pressed with the clamping block 7, and tightened and fixed with screws coated with glue; the shell assembly 2 is welded into one by the shell head 21, the magnetic isolation ring 22, and the shell bottom 23, and the vacuum liner 24 is welded to the inlet and pre-cooling discharge port of the shell bottom 23 by vacuum lead welding. After vacuum welding, the vacuum liner 24 is in a vacuum jacket mode in the tube.

[0046] The working principle of this embodiment is:

[0047] When not energized, the valve core assembly 3 is pressed against the valve seat 5 by the spring force of the spring 6, and the solenoid valve is in a closed state. At this time, when the propellant is pre-cooled, the propellant enters from the inlet and flows out from the pre-cooling discharge port, providing pre-cooled propellant for the downstream system; when the coil assembly is energized and the discharge port is closed, the valve core assembly 3 overcomes the spring force and the hydraulic pressure under the electromagnetic attraction and moves to the open position, realizing the opening of the solenoid valve, and the propellant flows from the outlet into the thrust chamber.

[0048] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0049] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A solenoid valve for ultra-low temperature, characterized in that: The invention comprises a coil assembly (1), a housing assembly (2), a valve core assembly (3) and a valve seat (5); the housing assembly (2) comprises a housing head (21) and a housing bottom (23); the coil assembly (1) is sleeved on the outside of the housing head (21); the housing bottom (23) is provided with an inlet, an outlet and a pre-cooling discharge port; and vacuum liners (24) are provided inside the inlet, the outlet and the pre-cooling discharge port. The housing assembly (2) has a built-in chamber, the chamber is connected to an inlet, an outlet and a pre-cooling discharge port, the valve core assembly (3) and the valve seat (5) are sequentially arranged in the chamber, and the valve core assembly (3) is arranged at the bottom of the chamber and is located between the inlet, the outlet and the pre-cooling discharge port; The coil assembly (1) comprises a frame (11), a coil (12), a cover (13) and a cover plate (14); the frame (11) is sleeved on the housing assembly (2); The coil (12) is wound on the frame (11), the cover (13) is sleeved on the outside of the frame (11) and the coil (12), and the cover plate (14) is arranged at the end of the cover (13); The skeleton (11) is made of non-metallic material, and the cover shell (13) is provided with a plurality of heat dissipation rings arranged in parallel along the circumferential direction.

2. The ultra-low temperature solenoid valve according to claim 1, characterized in that: The ultra-low temperature solenoid valve is a three-way solenoid valve, and an inlet, an outlet and a pre-cooling discharge port are arranged on the bottom (23) of the shell.

3. The ultra-low temperature solenoid valve according to claim 1, characterized in that: A filter assembly (4) is provided inside the chamber of the housing assembly (2), and the filter assembly (4) is provided between the valve core assembly (3) and the inlet, between the valve core assembly (3) and the pre-cooling discharge port, and between the valve core assembly (3) and the outlet.

4. The ultra-low temperature solenoid valve according to claim 1, characterized in that: A groove is provided on the outer side of the shell head (21) at a position corresponding to the cavity, a magnetic isolation ring (22) is provided in the groove, and the magnetic isolation ring (22) is located inside the coil assembly (1).

5. The ultra-low temperature solenoid valve according to claim 1, characterized in that: A slope structure is provided at the cutting edge of the valve seat (5), and the area of ​​the slope structure on the side close to the valve core assembly (3) is larger than the area on the side away from the valve core assembly (3).

6. The ultra-low temperature solenoid valve according to claim 1, characterized in that A pressing block (7) is provided at one end of the shell head (21), and the pressing block (7) is fixedly connected to the shell head (21) via a screw (8). The pressing block (7) is used to press the coil assembly (1).

7. The ultra-low temperature solenoid valve according to claim 6, characterized in that: A boss structure is provided on the housing head (21), one end of the coil assembly (1) is overlapped on the boss structure, and the other end of the coil assembly (1) is pressed by a pressing block (7).

8. The ultra-low temperature solenoid valve according to claim 1, characterized in that: A spring (6) is provided between the valve core assembly (3) and the bottom of the chamber.

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