A two-position three-way solenoid valve

Abstract

The application discloses a two-position three-way electromagnetic valve, and relates to the technical field of spaceflight, which comprises a framework, a coil, a valve seat, a valve core assembly, a shell, a lower shell and a gland. When the coil is not electrified, the upper valve is sealed with the valve seat under the action of the spring, the air inlet is sealed and isolated from the air outlet, and the air outlet is communicated with the exhaust port through the air outlet through hole of the framework, the air outlet hole of the valve seat, the main through hole of the valve seat and the main through hole of the gland. After the coil is electrified, the upper valve is separated from the valve seat under the electromagnetic attraction of the coil and overcomes the force of the spring, the air inlet, the air inlet through hole of the framework, the main through hole of the framework, the main through hole of the valve seat, the air outlet hole of the valve seat and the air outlet are communicated, and the air outlet is sealed and isolated from the exhaust port by the lower valve. The application can solve the defects that the existing electromagnetic valve is prone to air leakage due to vibration, and can improve the fluid flow smoothness by optimizing the flow channel.

Description

Technical Field

[0001] This application relates to the field of aerospace technology, and in particular to a two-position three-way solenoid valve. Background Technology

[0002] In the propellant supply system of a high-thrust liquid rocket engine, the liquid passage valves are critical control components. Due to their large diameter and high operating pressure, they are typically operated pneumatically or electrically. When pneumatically operated, a two-position three-way self-venting solenoid valve is required to control the flow of the control air to the liquid passage valves. The two-position three-way solenoid valve has three interfaces: an inlet, an outlet, and a vent. When the valve is closed, the outlet and vent are connected; when the valve is open, the inlet and outlet are connected, while the vent is cut off.

[0003] However, high-thrust liquid rocket engines operate in harsh vibration environments, and the solenoid valves with positive structures rely solely on spring mounting force to maintain the air inlet seal, making them prone to leakage under vibration conditions.

[0004] Therefore, there is an urgent need to develop a new two-position three-way solenoid valve with a completely new structure to solve the problem of existing solenoid valves being prone to leakage due to vibration.

[0005] In addition, the flow channels need to be optimized through new structures to improve fluid flow. Utility Model Content

[0006] The purpose of this application is to provide a two-position three-way solenoid valve that solves the problem of leakage caused by vibration in existing solenoid valves, and improves fluid flow by optimizing the flow channel.

[0007] To achieve the above objectives, this application provides a two-position three-way solenoid valve, comprising: a frame, a coil, a valve seat, a valve core assembly, a housing, a lower housing, and a gland; wherein, one end of the frame is a frame sealing end, and the other end of the frame has a frame main through hole; the frame is provided with at least one frame air inlet hole, one end of which communicates with the frame main through hole; the frame is provided with at least one frame air outlet hole, one end of which communicates with the frame main through hole; the coil is disposed on the outside of the frame; the valve seat is provided with a valve seat main through hole and at least one valve seat air outlet hole, one end of which communicates with the valve seat main through hole; the valve seat is located at the end of the frame main through hole away from the frame sealing end, and the outside of the valve seat is connected to the frame main through hole. The inner side is detachably connected; after connection, one end of the main through hole of the valve seat communicates with the main through hole of the skeleton, and the other end of the vent hole of the valve seat communicates with one end of the vent hole of the skeleton; the valve core assembly includes at least: an upper valve, a spring, a connecting rod, and a lower valve; the upper valve is set in the main through hole of the skeleton, and the outer side of the upper valve is slidably connected to the inner side of the main through hole of the skeleton; at least one upper valve vent groove is opened on the outer side of the upper valve along the axial direction, and the upper valve vent groove passes through both ends of the upper valve; the diameter of the upper valve is smaller than the diameter of the main through hole of the valve seat; the spring is set in the main through hole of the skeleton and is located within the effective range of the coil; one end of the spring is connected to the inner side of the sealing end of the skeleton, and the other end of the spring is connected to one end of the upper valve; one end of the connecting rod is connected to the upper valve. The other end of the valve is connected to the connecting rod, which passes through the main through hole of the valve seat and connects to the lower valve. The diameter of the connecting rod is smaller than the diameter of the main through hole of the valve seat. The diameter of the lower valve is larger than the diameter of the main through hole of the valve seat. The outer shell is connected to a part of the outer side of the frame, and the coil is located between the outer shell and the frame. The lower shell is provided with a main through hole, an air inlet, and an air outlet. One end of the air inlet is connected to the main through hole of the lower shell, and one end of the air outlet is connected to the main through hole of the lower shell. One end of the lower shell is connected to one end of the outer shell. After the connection, the other part of the outer side of the frame is located in the main through hole of the lower shell. The other end of the frame's air outlet is connected to the air outlet, and the air inlet is connected to the frame's main through hole through the frame's air inlet. One end of the gland is the gland sealing end. The other end of the pressure cap has a main through hole; the sealing end of the pressure cap has an exhaust port, which is connected to the main through hole of the pressure cap; the other end of the pressure cap is connected to the other end of the lower housing, and after connection, the main through hole of the pressure cap is connected to the main through hole of the valve seat; when the coil is not energized, the upper valve forms a seal with the valve seat under the action of the spring, the air inlet and the air outlet are sealed and isolated, and the air outlet and the exhaust port are connected through the air outlet through hole of the skeleton, the air outlet hole of the valve seat, the main through hole of the valve seat and the main through hole of the pressure cap; when the coil is energized, the upper valve overcomes the force of the spring and separates from the valve seat under the electromagnetic attraction of the coil, and the air inlet, the air inlet through hole of the skeleton, the main through hole of the skeleton, the main through hole of the valve seat, the air outlet hole of the valve seat and the air outlet are connected, and the air outlet and the exhaust port are sealed and isolated by the lower valve.

[0008] As shown above, the inner side of the frame sealing end is provided with a frame spring mounting groove, and one end of the spring is set in the frame spring mounting groove; one end of the upper valve is provided with an upper valve spring mounting groove, and the other end of the spring is set in the upper valve spring mounting groove.

[0009] As shown above, the other end of the upper valve is equipped with an upper valve seal. When the coil is not energized, the upper valve contacts the valve seat through the upper valve seal under the action of the spring, forming a sealing pair.

[0010] As described above, the upper valve includes: a first upper valve body and a second upper valve body; the diameter of the first upper valve body is larger than the diameter of the second upper valve body; one end of the first upper valve body is connected to one end of the second upper valve body; an upper valve spring mounting groove is provided at the other end of the first upper valve body; an upper valve vent groove is provided along the axial direction on the outside of the first upper valve body, and the upper valve vent groove passes through both ends of the first upper valve body; one end of a connecting rod is connected to the other end of the second upper valve body, and the diameter of the second upper valve body is larger than the diameter of the connecting rod; an upper valve seal is provided at the other end of the second upper valve body and is located outside the connecting rod.

[0011] As shown above, one end of the lower valve is the lower valve sealing end, and the other end of the lower valve has a lower valve connecting through hole; the other end of the connecting rod passes through the main through hole of the valve seat and connects with the lower valve connecting through hole; the other end of the lower valve is provided with a lower valve sealing element. After the coil is energized, it contacts the valve seat through the lower valve sealing element to form a sealing pair.

[0012] As described above, the skeleton includes: a first skeleton body, a second skeleton body, a third skeleton body, and a fourth skeleton body; the diameter of the first skeleton body is larger than the diameter of the second skeleton body, and the diameters of the second, third, and fourth skeleton bodies are equal; one end of the first skeleton body is a skeleton sealing end, and the other end of the first skeleton body has a first skeleton through hole; a coil mounting groove is provided on the outer side of the first skeleton body, and the coil is placed in the coil mounting groove; the second skeleton body has a second skeleton through hole, the diameter of which is equal to the diameter of the first skeleton through hole; a skeleton air inlet is provided on the second skeleton body and communicates with the second skeleton through hole; the third skeleton body has a third skeleton through hole, the diameter of which is larger than the diameter of the second skeleton through hole; and a skeleton air outlet is provided on the third skeleton body. The first skeleton body is connected to the second skeleton body through hole; the second skeleton body has a skeleton sealing structure on its inner side; the fourth skeleton body has a fourth skeleton through hole with a diameter larger than that of the third skeleton through hole; a portion of the other end of the first skeleton body is connected to one end of the second skeleton body, and the first skeleton through hole is aligned with and connected to the second skeleton through hole; a portion of the other end of the second skeleton body is connected to one end of the third skeleton body, and a sealing gasket is also provided on the other portion of the other end of the second skeleton body, with the sealing gasket located on the inner side of the third skeleton body; a portion of the other end of the third skeleton body is connected to one end of the fourth skeleton body; after connection, the first skeleton through hole, the second skeleton through hole, the third skeleton through hole and the fourth skeleton through hole constitute the main through hole of the skeleton; when the valve seat is connected to the skeleton, both the sealing gasket and the skeleton sealing structure are in contact with the valve seat.

[0013] As described above, the valve seat includes: a first valve seat body, a second valve seat body, a third valve seat body, and a fourth valve seat body; the diameter of the first valve seat body is smaller than the diameter of the second valve seat body, the diameter of the second valve seat body is smaller than the diameter of the third valve seat body, and the diameter of the third valve seat body is smaller than the diameter of the fourth valve seat body; the first valve seat body is provided with a first valve seat through hole; the second valve seat body is provided with a second valve seat through hole, the diameter of which is equal to the diameter of the first valve seat through hole; the third valve seat body is provided with a third valve seat upper through hole and a third valve seat lower through hole, one end of the third valve seat upper through hole and one end of the third valve seat lower through hole are connected; the diameter of the third valve seat upper through hole is equal to the diameter of the second valve seat through hole; a valve seat vent is provided on the third valve seat body, and the valve seat vent is connected to the third valve seat upper through hole; the fourth valve seat body is provided with a fourth valve seat through hole, the diameter of which is equal to the diameter of the third valve seat lower through hole; the diameter of the fourth valve seat through hole is larger than the diameter of the lower valve; the first valve... One end of the valve body is connected to a portion of one end of the second valve seat body, and the through hole of the first valve seat is aligned with and communicates with the through hole of the second valve seat; the other end of the second valve seat body is connected to a portion of one end of the third valve seat body, and the through hole of the second valve seat is aligned with and communicates with the upper through hole of the third valve seat; the other end of the third valve seat body is connected to a portion of one end of the fourth valve seat body; the lower through hole of the third valve seat is aligned with and communicates with the through hole of the fourth valve seat; after connection, the through holes of the first, second, third, and fourth valve seats constitute the main through hole of the valve seat; when the valve seat is connected to the skeleton, the sealing gasket contacts the other part of one end of the third valve seat body to form a sealing pair; the skeleton sealing structure contacts the outer side of the third valve seat body to form a sealing pair; when the coil is not energized, the upper valve, under the action of the spring, contacts the other end of the first valve body through the upper valve seal to form a sealing pair; when the coil is energized, it contacts the third valve seat body through the lower valve seal to form a sealing pair.

[0014] As shown above, a sealing baffle is provided at the other end of the lower through hole of the third valve seat. When the coil is not energized, the lower valve seal is separated from the sealing baffle. When the coil is energized, the lower valve seal contacts the sealing baffle to form a sealing pair.

[0015] As described above, the gland includes: a first gland body and a second gland body; the diameter of the first gland body is larger than the diameter of the second gland body; the first gland body is provided with a first gland through hole; one end of the second gland body is a gland sealing end, and the other end of the second gland body is provided with a second gland through hole; an exhaust port is provided at the gland sealing end and communicates with the second gland through hole; the diameter of the first gland through hole is equal to the diameter of the second gland through hole, and the diameter of the first gland through hole is larger than the diameter of the lower valve; one end of the first gland body is connected to one end of the second gland body, and the first gland through hole and the second gland through hole are aligned and communicate with each other; after connection, the first gland through hole and the second gland through hole constitute the main through hole of the gland.

[0016] As shown above, the upper valve seal, sealing gasket, skeleton sealing structure, first lower housing seal, second lower housing seal and third lower housing seal are all rubber O-rings.

[0017] The beneficial effects achieved by this application are as follows:

[0018] (1) The two-position three-way solenoid valve of this application solves the defect of existing solenoid valves that are prone to air leakage due to vibration, and can improve the fluid flow by optimizing the flow channel. Specifically, the two-position three-way solenoid valve of this application is a reverse two-position three-way solenoid valve structure, which can ensure the closing and sealing of the valve (upper valve and lower valve) under the combined action of gas force and spring force, and can improve the adaptability to the mechanical environment during operation; the separate structure of upper valve and lower valve can make the flow channel smoother.

[0019] (2) The two-position three-way solenoid valve of this application can be applied to the field of liquid rocket engines as a control valve for the control gas required by pneumatic valves, and can provide the function of self-venting control gas.

[0020] (3) The two-position three-way solenoid valve of this application can provide sealing force for the inlet pressure. With the combined effect of the spring force, the valve core assembly can adapt to a larger mechanical environment, thereby ensuring that reliable sealing can still be maintained under the conditions of 6MPa inlet air supply and 100g vibration level, and the sealing effect is obvious. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0022] Figure 1 A cross-sectional view of one embodiment of a two-position three-way solenoid valve;

[0023] Figure 2 A schematic diagram of one embodiment of the upper valve and connecting rod;

[0024] Figure 3 This is a schematic diagram of one embodiment of the lower trapdoor;

[0025] Figure 4 This is a schematic diagram of one embodiment of the valve seat. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] like Figure 1-4As shown, this application provides a two-position three-way solenoid valve, including: a frame 1, a coil 2, a valve seat 3, a valve core assembly 4, a housing 5, a lower housing 6, and a pressure cap 7. One end of the frame 1 is a frame sealing end, and the other end of the frame 2 has a frame main through hole. The frame 1 has at least one frame air inlet hole 11, one end of which communicates with the frame main through hole. The frame 1 also has at least one frame air outlet hole 12, one end of which communicates with the frame main through hole. The coil 2 is located on the outside of the frame 1. The valve seat 3 has a valve seat main through hole and at least one valve seat air outlet hole 31, one end of which communicates with the valve seat main through hole. The valve seat 3 is located at the end of the frame main through hole away from the frame sealing end, and the outside of the valve seat 3 is detachably connected to the inside of the frame main through hole. After connection, one end of the valve seat main through hole communicates with the frame main through hole, and the other end of the valve seat air outlet hole communicates with one end of the frame air outlet hole 12. The valve core assembly 4 includes at least: an upper valve 41, a spring 42, a connecting rod 43, and a lower valve 44; the upper valve 41 is disposed in the main through hole of the frame, and the outer side of the upper valve 41 is slidably connected to the inner side of the main through hole of the frame; at least one upper valve vent groove 411 is provided on the outer side of the upper valve 41 along the axial direction, and the upper valve vent groove 411 passes through both ends of the upper valve 41; the diameter of the upper valve 41 is smaller than the diameter of the main through hole of the valve seat; the spring 42 is disposed in the main through hole of the frame and is located within the effective range of the coil 2; one end of the spring 42 is connected to the inner side of the sealing end of the frame, and the other end of the spring 42 is connected to one end of the upper valve 41; one end of the connecting rod 43 is connected to the other end of the upper valve 41, and the other end of the connecting rod 43 passes through the main through hole of the valve seat and is connected to the lower valve 44; the diameter of the connecting rod 43 is smaller than the diameter of the main through hole of the valve seat; the diameter of the lower valve 44 is larger than the diameter of the main through hole of the valve seat. The outer shell 5 is connected to a portion of the outer side of the frame 1, and the coil 2 is located between the outer shell 5 and the frame 1. The lower shell 6 is provided with a lower shell main through hole, an air inlet 61, and an air outlet 62; one end of the air inlet 61 is connected to the lower shell main through hole, and one end of the air outlet 62 is connected to the lower shell main through hole; one end of the lower shell 6 is connected to one end of the outer shell 5. After the connection, the other portion of the outer side of the frame 2 is located inside the lower shell main through hole, and the other end of the frame air outlet through hole 12 is connected to the air outlet 62. The air inlet 61 is connected to the frame main through hole through the frame air inlet through hole 11. One end of the pressure cap 7 is the pressure cap sealing end, and the other end of the pressure cap 7 is provided with a pressure cap main through hole; the pressure cap sealing end is provided with an exhaust port 71, which is connected to the pressure cap main through hole; the other end of the pressure cap 7 is connected to the other end of the lower shell 6. After the connection, the pressure cap main through hole is connected to the valve seat main through hole.When the coil is not energized, the upper valve 41 forms a seal with the valve seat 3 under the action of the spring 42, and the air inlet 61 and the air outlet 62 are sealed and isolated. The air outlet 62 and the exhaust port 71 are connected through the skeleton air outlet hole 12, the valve seat air outlet hole 31, the valve seat main through hole and the pressure cover main through hole. When the coil is energized, the upper valve 41 overcomes the force of the spring 42 and separates from the valve seat 3 under the electromagnetic attraction of the coil 2. The air inlet 61, the skeleton air inlet hole 11, the skeleton main through hole, the valve seat main through hole, the valve seat air outlet hole 31 and the air outlet 62 are connected. The air outlet 62 and the exhaust port 71 are sealed and isolated by the lower valve 44.

[0028] Specifically, spring 42 provides a restoring force for upper valve 41. Lower housing 6 provides a passage for gas flow and a solenoid valve interface. Gland 7 provides motion guidance and a gas flow passage for lower valve 44. An upper valve vent groove 411 is opened axially on upper valve 41 to facilitate gas flow and reduce eddy current effects during operation. The two-position three-way solenoid valve of this application can be applied in the field of liquid rocket engines as a control valve for the control gas required by pneumatic valves, and can provide a self-venting function for control gas. Using the two-position three-way solenoid valve of this application, a sealing force can be provided for the inlet pressure. Combined with the spring force, the valve core assembly can adapt to a larger mechanical environment, thus ensuring reliable sealing even under inlet venting pressure of 6MPa and vibration level of 100g, with a significant sealing effect.

[0029] Furthermore, a skeleton spring mounting groove is provided on the inner side of the skeleton sealing end, and one end of the spring 42 is set in the skeleton spring mounting groove.

[0030] Furthermore, one end of the upper door 41 is provided with an upper door spring mounting groove, and the other end of the spring 42 is located in the upper door spring mounting groove.

[0031] Furthermore, such as Figure 2 As shown, the other end of the upper valve 41 is provided with an upper valve seal 412. When the coil 2 is not energized, the upper valve 41 contacts the valve seat 3 through the upper valve seal 412 under the action of the spring 42, forming a sealing pair.

[0032] Furthermore, the upper valve seal 412 is a plastic sealing block, but it is not limited to plastic sealing blocks; it can also be other components with sealing functions, such as rubber O-rings.

[0033] Furthermore, the upper valve 41 includes: a first upper valve body and a second upper valve body; the diameter of the first upper valve body is larger than the diameter of the second upper valve body. One end of the first upper valve body is connected to one end of the second upper valve body. An upper valve spring mounting groove is provided at the other end of the first upper valve body. An upper valve vent groove 411 is provided along the axial direction on the outside of the first upper valve body, and the upper valve vent groove 411 passes through both ends of the first upper valve body. One end of the connecting rod 43 is connected to the other end of the second upper valve body, and the diameter of the second upper valve body is larger than the diameter of the connecting rod 43; an upper valve seal 412 is provided at the other end of the second upper valve body and is located outside the connecting rod 43.

[0034] Specifically, the upper valve 41 can be an integral structure or a separate structure, and this application prefers an integral structure.

[0035] Furthermore, such as Figure 1 and Figure 3 As shown, one end of the lower valve 44 is the lower valve sealing end, and the other end of the lower valve 44 is provided with a lower valve connecting through hole 441; the other end of the connecting rod 43 passes through the main through hole of the valve seat and is connected to the lower valve connecting through hole 441.

[0036] Furthermore, the other end of the connecting rod 43 is threadedly connected to the lower valve connecting through hole 441, but is not limited to threaded connection; in this application, threaded connection is preferred.

[0037] Specifically, the other end of the connecting rod 43 is provided with a connecting rod thread 431. After the upper valve is threadedly connected to the lower valve 44 through the connecting rod 43, the upper valve 41 and the lower valve 44 are linked together.

[0038] Furthermore, as an embodiment, the lower valve 44 is a cylindrical structure with at least three milled flat surfaces 442 on the outer side for gas flow.

[0039] Furthermore, a lower valve seal 443 is provided at the other end of the lower valve 44. When the coil 2 is energized, it contacts the valve seat 3 through the lower valve seal 443 to form a sealing pair.

[0040] Specifically, the lower valve seal 443 is a plastic block, but it is not limited to plastic blocks.

[0041] Furthermore, such as Figure 1As shown, the skeleton 1 includes: a first skeleton body, a second skeleton body, a third skeleton body, and a fourth skeleton body. The diameter of the first skeleton body is larger than the diameter of the second skeleton body, and the diameters of the second, third, and fourth skeleton bodies are equal. One end of the first skeleton body is a skeleton sealing end, and the other end of the first skeleton body has a first skeleton through hole; a coil mounting groove is provided on the outer side of the first skeleton body, and the coil 2 is installed in the coil mounting groove. The second skeleton body has a second skeleton through hole, the diameter of which is equal to the diameter of the first skeleton through hole; a skeleton air inlet 11 is provided on the second skeleton body and communicates with the second skeleton through hole. The third skeleton body has a third skeleton through hole, the diameter of which is larger than the diameter of the second skeleton through hole; a skeleton air outlet 12 is provided on the third skeleton body and communicates with the third skeleton through hole; a skeleton sealing structure 13 is provided on the inner side of the third skeleton body. The fourth skeleton body has a fourth skeleton through hole, the diameter of which is larger than the diameter of the third skeleton through hole. A portion of the other end of the first skeleton body is connected to one end of the second skeleton body, and the first skeleton through hole is aligned with and communicates with the second skeleton through hole. A portion of the other end of the second skeleton body is connected to one end of the third skeleton body, and a sealing gasket 14 is also provided on another portion of the other end of the second skeleton body, with the sealing gasket 14 located inside the third skeleton body. A portion of the other end of the third skeleton body is connected to one end of the fourth skeleton body; after connection, the first skeleton through hole, the second skeleton through hole, the third skeleton through hole, and the fourth skeleton through hole constitute the main through hole of the skeleton. When the valve seat 3 is connected to the skeleton 1, both the sealing gasket 14 and the skeleton sealing structure 13 are in contact with the valve seat 3.

[0042] Specifically, a sealing gasket 14 is used to seal the valve seat 3 and the frame 1. The stroke of the upper valve 31 is adjusted by adjusting the thickness of the sealing gasket 14. A coil 2 is made by tightly winding enameled wire around the frame 1, but it is not limited to using enameled wire tightly wound around the frame 1 to make a coil 2.

[0043] Furthermore, both the sealing gasket 14 and the skeleton sealing structure 13 are rubber O-rings, but are not limited to rubber O-rings.

[0044] Furthermore, the skeleton 1 is made of a soft magnetic alloy material, but is not limited to soft magnetic alloy materials.

[0045] Furthermore, the outer shell 5 is disposed on the outside of the first skeleton body.

[0046] Furthermore, the outer shell 5 is connected to the frame 1 by an interference fit, and there is a preset first interference between the upper inner diameter of the outer shell 5 and the contact part of the frame 1; there is a preset second interference between the lower inner diameter of the outer shell 5 and the contact part of the frame 1.

[0047] Furthermore, the specific values ​​of the preset first interference and second interference are set according to the actual situation. In this application, it is preferred that the first interference and the second interference are both 0.01mm to 0.03mm.

[0048] Furthermore, the valve seat 3 and the skeleton 1 are connected by threads, but not limited to threaded connections. In this application, a threaded connection is preferred.

[0049] Furthermore, the outer side of the valve seat 3 is provided with a valve thread 32, which is connected to the inner side of the fourth skeleton through hole through the valve thread 32.

[0050] Furthermore, such as Figure 1 and Figure 4 As shown, valve seat 3 includes: a first valve seat body, a second valve seat body, a third valve seat body, and a fourth valve seat body. The diameter of the first valve seat body is smaller than the diameter of the second valve seat body, the diameter of the second valve seat body is smaller than the diameter of the third valve seat body, and the diameter of the third valve seat body is smaller than the diameter of the fourth valve seat body. The first valve seat body is provided with a first valve seat through hole. The second valve seat body is provided with a second valve seat through hole, the diameter of which is equal to the diameter of the first valve seat through hole. The third valve seat body is provided with a third valve seat upper through hole and a third valve seat lower through hole, one end of the third valve seat upper through hole and one end of the third valve seat lower through hole are connected; the diameter of the third valve seat upper through hole is equal to the diameter of the second valve seat through hole; a valve seat vent 31 is provided on the third valve seat body, and the valve seat vent 31 is connected to the third valve seat upper through hole. The fourth valve seat body is provided with a fourth valve seat through hole, the diameter of which is equal to the diameter of the lower through hole of the third valve seat; the diameter of the fourth valve seat through hole is larger than the diameter of the lower valve 44. One end of the first valve body is connected to a portion of one end of the second valve seat body, and the first valve seat through hole is aligned with and communicates with the second valve seat through hole. The other end of the second valve seat body is connected to a portion of one end of the third valve seat body, and the second valve seat through hole is aligned with and communicates with the upper through hole of the third valve seat. The other end of the third valve seat body is connected to a portion of one end of the fourth valve seat body; the lower through hole of the third valve seat is aligned with and communicates with the fourth valve seat through hole. After connection, the first valve seat through hole, the second valve seat through hole, the upper through hole of the third valve seat, the lower through hole of the third valve seat, and the fourth valve seat through hole constitute the main through hole of the valve seat. When the valve seat 3 is connected to the skeleton 1, the sealing gasket 14 contacts the other part of one end of the third valve seat body to form a sealing pair; the skeleton sealing structure 13 contacts the outer side of the third valve seat body to form a sealing pair. When coil 2 is not energized, the upper valve 41, under the action of spring 42, contacts the other end of the first valve body through the upper valve seal 412 to form a sealing pair; after coil 2 is energized, it contacts the third valve seat body through the lower valve seal 443 to form a sealing pair.

[0051] Specifically, when coil 2 is not energized, the upper valve seal 412 contacts the other end of the first valve body to form a sealing pair, and the air inlet 61 and the air outlet 62 are sealed and isolated; the lower valve seal 443 is separated from the third valve seat body, and the air outlet 62 and the exhaust port 71 are connected through the skeleton air outlet through hole 12, the valve seat air outlet hole 31, the valve seat main through hole and the pressure cap main through hole; after coil 2 is energized, the upper valve seal 412 is separated from the other end of the first valve body, and the air inlet 61, the skeleton air inlet through hole 11, the skeleton main through hole, the valve seat main through hole, the valve seat air outlet hole 31 and the air outlet 62 are connected, and the lower valve seal 443 contacts the third valve seat body to form a sealing pair, and the air outlet 62 and the exhaust port 71 are sealed and isolated.

[0052] Furthermore, the valve seat 3 can be an integral structure or a separate structure, and in this application, it is preferably an integral structure.

[0053] Furthermore, valve thread 32 is located on the outside of the fourth valve body.

[0054] Furthermore, a sealing baffle is provided at the other end of the lower through hole of the third valve seat. When the coil 2 is not energized, the lower valve seal 443 is separated from the sealing baffle; when the coil 2 is energized, it contacts the sealing baffle through the lower valve seal 443 to form a sealing pair.

[0055] Furthermore, the lower housing 6 and the outer housing 5 are connected by threads, but are not limited to threaded connections.

[0056] Furthermore, the diameter of the main through hole of the lower housing is smaller than the diameter of the outer shell through hole of the outer shell 5. During connection, a part of one end of the lower housing 6 is connected to one end of the outer shell 5, and the other part of one end of the lower housing 6 is in contact with the other part of the other end of the first skeleton body.

[0057] Furthermore, a first lower housing seal 63 is provided on the other part of one end of the lower housing 6. After the lower housing 6 is connected to the outer housing 5, a seal is formed between the first lower housing seal 63 and the other part of the other end of the first frame body.

[0058] Furthermore, a second lower housing seal 64 is provided on the inner side of the lower housing 6. After the lower housing 6 is connected to the outer housing 5, the lower housing 6 forms a seal with the outer side of the second frame body through the second lower housing seal 64.

[0059] Furthermore, a third lower housing seal 65 is provided on the inner side of the lower housing 6. After the lower housing 6 is connected to the outer housing 5, the lower housing 6 forms a seal with the outer side of the third frame body through the third lower housing seal 65.

[0060] Furthermore, the first lower housing seal 63, the second lower housing seal 64, and the third lower housing seal 65 are all rubber O-rings, but are not limited to rubber O-rings.

[0061] Furthermore, the pressure cap 7 includes: a first pressure cap body and a second pressure cap body; the diameter of the first pressure cap body is larger than the diameter of the second pressure cap body; the first pressure cap body is provided with a first pressure cap through hole; one end of the second pressure cap body is a pressure cap sealing end, and the other end of the second pressure cap body is provided with a second pressure cap through hole; an exhaust port 71 is provided at the pressure cap sealing end and communicates with the second pressure cap through hole; the diameter of the first pressure cap through hole is equal to the diameter of the second pressure cap through hole, and the diameter of the first pressure cap through hole is larger than the diameter of the lower valve 44; one end of the first pressure cap body is connected to one end of the second pressure cap body, and the first pressure cap through hole and the second pressure cap through hole are aligned and communicate with each other; after connection, the first pressure cap through hole and the second pressure cap through hole constitute the main through hole of the pressure cap.

[0062] Furthermore, the gland 7 and the lower housing 6 are connected by threads, but are not limited to threaded connections.

[0063] Specifically, the outer side of the first pressure cap body is provided with a pressure cap thread, which is connected to the lower housing 6 through the pressure cap thread.

[0064] Furthermore, in the two-position three-way solenoid valve of this application, both internal and external leakage between the various parts is ensured by rubber O-rings, and the specific specifications and dimensions of the rubber O-rings are selected according to the installation structure.

[0065] The beneficial effects achieved by this application are as follows:

[0066] (1) The two-position three-way solenoid valve of this application solves the defect of existing solenoid valves that are prone to air leakage due to vibration, and can improve the fluid flow by optimizing the flow channel. Specifically, the two-position three-way solenoid valve of this application is a reverse two-position three-way solenoid valve structure, which can ensure the closing and sealing of the valve (upper valve and lower valve) under the combined action of gas force and spring force, and can improve the adaptability to the mechanical environment during operation; the separate structure of upper valve and lower valve can make the flow channel smoother.

[0067] (2) The two-position three-way solenoid valve of this application can be applied to the field of liquid rocket engines as a control valve for the control gas required by pneumatic valves, and can provide the function of self-venting control gas.

[0068] (3) The two-position three-way solenoid valve of this application can provide sealing force for the inlet pressure. With the combined effect of the spring force, the valve core assembly can adapt to a larger mechanical environment, thereby ensuring that reliable sealing can still be maintained under the conditions of 6MPa inlet air supply and 100g vibration level, and the sealing effect is obvious.

[0069] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the scope of protection of this application is intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application. Obviously, those skilled in the art can make various alterations and variations to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of protection of this application and its equivalents, this application also intends to include these modifications and variations.

Claims

1. A two-position three-way solenoid valve, characterized in that, include: Frame, coil, valve seat, valve core assembly, housing, lower housing, and gland; Among them, one end of the frame is the frame sealing end, and the other end of the frame is provided with the frame main through hole; the frame is provided with at least one frame air inlet through hole, one end of the frame air inlet through hole is connected to the frame main through hole; the frame is provided with at least one frame air outlet through hole, one end of the frame air outlet through hole is connected to the frame main through hole. The coil is positioned on the outside of the frame; The valve seat is provided with a main through hole and at least one vent hole. One end of the vent hole is connected to the main through hole. The valve seat is located at the end of the main through hole of the skeleton that is away from the sealing end of the skeleton, and the outer side of the valve seat is detachably connected to the inner side of the main through hole of the skeleton. After connection, one end of the main through hole of the valve seat is connected to the main through hole of the skeleton, and the other end of the vent hole of the valve seat is connected to one end of the vent hole of the skeleton. The valve core assembly includes at least: an upper valve, a spring, a connecting rod, and a lower valve; the upper valve is disposed within the main through hole of the frame, and the outer side of the upper valve is slidably connected to the inner side of the main through hole of the frame; at least one upper valve vent groove is formed on the outer side of the upper valve along the axial direction, and the upper valve vent groove passes through both ends of the upper valve; the diameter of the upper valve is smaller than the diameter of the main through hole of the valve seat; the spring is disposed in the main through hole of the frame and is located within the effective range of the coil; one end of the spring is connected to the inner side of the sealing end of the frame, and the other end of the spring is connected to one end of the upper valve; one end of the connecting rod is connected to the other end of the upper valve, and the other end of the connecting rod passes through the main through hole of the valve seat and is connected to the lower valve; the diameter of the connecting rod is smaller than the diameter of the main through hole of the valve seat; the diameter of the lower valve is larger than the diameter of the main through hole of the valve seat. The outer shell is connected to a portion of the outer frame, and the coil is located between the outer shell and the frame; The lower housing is provided with a main through hole, an air inlet and an air outlet; one end of the air inlet is connected to the main through hole of the lower housing, and one end of the air outlet is connected to the main through hole of the lower housing; one end of the lower housing is connected to one end of the outer housing, and after connection, the other part of the outer side of the frame is located in the main through hole of the lower housing, the other end of the frame air outlet through hole is connected to the air outlet, and the air inlet is connected to the frame main through hole through the frame air inlet through hole; One end of the gland is the gland sealing end, and the other end of the gland has a gland main through hole; the gland sealing end is provided with an exhaust port, which is connected to the gland main through hole; the other end of the gland is connected to the other end of the lower housing, and after connection, the gland main through hole is connected to the valve seat main through hole. When the coil is not energized, the upper valve forms a seal with the valve seat under the action of the spring, the air inlet and the air outlet are sealed and isolated, and the air outlet and the exhaust outlet are connected through the air outlet hole of the skeleton, the air outlet hole of the valve seat, the main through hole of the valve seat and the main through hole of the pressure cover. After the coil is energized, the upper valve overcomes the spring force and separates from the valve seat under the electromagnetic attraction of the coil. The air inlet, the frame air inlet hole, the frame main through hole, the valve seat main through hole, the valve seat air outlet hole and the air outlet are connected, and the air outlet and exhaust port are sealed and isolated by the lower valve.

2. The two-position three-way solenoid valve according to claim 1, characterized in that, The inner side of the frame sealing end is provided with a frame spring mounting groove, and one end of the spring is set in the frame spring mounting groove; one end of the upper valve is provided with an upper valve spring mounting groove, and the other end of the spring is set in the upper valve spring mounting groove.

3. The two-position three-way solenoid valve according to claim 2, characterized in that, The other end of the upper valve is equipped with an upper valve seal. When the coil is not energized, the upper valve contacts the valve seat through the upper valve seal under the action of the spring, forming a sealing pair.

4. The two-position three-way solenoid valve according to claim 3, characterized in that, The upper valve includes: a first upper valve body and a second upper valve body; the diameter of the first upper valve body is larger than the diameter of the second upper valve body; one end of the first upper valve body is connected to one end of the second upper valve body; an upper valve spring mounting groove is provided at the other end of the first upper valve body; an upper valve vent groove is provided along the axial direction on the outside of the first upper valve body, and the upper valve vent groove passes through both ends of the first upper valve body; one end of a connecting rod is connected to the other end of the second upper valve body, and the diameter of the second upper valve body is larger than the diameter of the connecting rod; an upper valve seal is provided at the other end of the second upper valve body and is located outside the connecting rod.

5. The two-position three-way solenoid valve according to claim 4, characterized in that, One end of the lower valve is the lower valve sealing end, and the other end of the lower valve has a lower valve connecting through hole; the other end of the connecting rod passes through the main through hole of the valve seat and connects to the lower valve connecting through hole; the other end of the lower valve is provided with a lower valve sealing element. After the coil is energized, it contacts the valve seat through the lower valve sealing element to form a sealing pair.

6. The two-position three-way solenoid valve according to claim 5, characterized in that, The skeleton includes: The first main skeleton, the second main skeleton, the third main skeleton, and the fourth main skeleton; The diameter of the first skeleton body is larger than the diameter of the second skeleton body, and the diameters of the second skeleton body, the third skeleton body, and the fourth skeleton body are equal. One end of the first frame body is a frame sealing end, and the other end of the first frame body is provided with a first frame through hole; a coil mounting groove is provided on the outer side of the first frame body, and the coil is placed in the coil mounting groove; The second frame body is provided with a second frame through hole, the diameter of which is equal to the diameter of the first frame through hole; the frame air inlet through hole is provided on the second frame body and communicates with the second frame through hole. The third frame body is provided with a third frame through hole, the diameter of which is larger than the diameter of the second frame through hole; the frame air outlet through hole is provided on the third frame body and is connected to the third frame through hole. The inner side of the third main frame is provided with a frame sealing structure; The fourth skeleton body is provided with a fourth skeleton through hole, the diameter of which is larger than the diameter of the third skeleton through hole. A portion of the other end of the first skeleton body is connected to one end of the second skeleton body, and the through hole of the first skeleton body is aligned with and connected to the through hole of the second skeleton body. A portion of the other end of the second skeleton body is connected to one end of the third skeleton body. A sealing gasket is also provided on another portion of the other end of the second skeleton body, and the sealing gasket is located inside the third skeleton body. A portion of the other end of the third skeleton body is connected to one end of the fourth skeleton body; after connection, the first skeleton through hole, the second skeleton through hole, the third skeleton through hole and the fourth skeleton through hole constitute the main through hole of the skeleton. After the valve seat is connected to the frame, both the sealing gasket and the frame sealing structure come into contact with the valve seat.

7. The two-position three-way solenoid valve according to claim 6, characterized in that, The valve seat includes: The first valve seat body, the second valve seat body, the third valve seat body, and the fourth valve seat body; The diameter of the first valve seat body is smaller than the diameter of the second valve seat body, the diameter of the second valve seat body is smaller than the diameter of the third valve seat body, and the diameter of the third valve seat body is smaller than the diameter of the fourth valve seat body. The first valve seat body is provided with a first valve seat through hole; The second valve seat body is provided with a second valve seat through hole, the diameter of which is equal to the diameter of the first valve seat through hole; The third valve seat body is provided with a third valve seat upper through hole and a third valve seat lower through hole, one end of the third valve seat upper through hole and one end of the third valve seat lower through hole are connected; the diameter of the third valve seat upper through hole is equal to the diameter of the second valve seat through hole; the valve seat vent is provided on the third valve seat body, and the valve seat vent is connected to the third valve seat upper through hole. The fourth valve seat body is provided with a fourth valve seat through hole, the diameter of which is equal to the diameter of the lower through hole of the third valve seat; the diameter of the fourth valve seat through hole is larger than the diameter of the lower valve. One end of the first valve body is connected to a portion of one end of the second valve seat body, and the through hole of the first valve seat is aligned with and connected to the through hole of the second valve seat. The other end of the second valve seat body is connected to a part of one end of the third valve seat body, and the through hole of the second valve seat is aligned with and connected to the through hole of the third valve seat. The other end of the third valve seat body is connected to a portion of one end of the fourth valve seat body; the lower through hole of the third valve seat is aligned with and connected to the through hole of the fourth valve seat. After connection, the first valve seat through hole, the second valve seat through hole, the third valve seat upper through hole, the third valve seat lower through hole and the fourth valve seat through hole constitute the main through hole of the valve seat; When the valve seat is connected to the skeleton, the sealing gasket contacts the other part of one end of the third valve seat body to form a sealing pair; the skeleton sealing structure contacts the outer side of the third valve seat body to form a sealing pair. When the coil is not energized, the upper valve, under the action of the spring, contacts the other end of the first valve body through the upper valve seal, forming a sealing pair; When the coil is energized, it contacts the body of the third valve seat through the lower valve seal to form a sealing pair.

8. The two-position three-way solenoid valve according to claim 7, characterized in that, A sealing baffle is provided at the other end of the lower through hole of the third valve seat. When the coil is not energized, the lower valve seal is separated from the sealing baffle. When the coil is energized, the lower valve seal contacts the sealing baffle to form a sealing pair.

9. The two-position three-way solenoid valve according to claim 8, characterized in that, The cap includes: First pressure cap body and second pressure cap body; The diameter of the first pressure cap body is larger than the diameter of the second pressure cap body; The first pressure cap body is provided with a first pressure cap through hole; One end of the second gland body is the gland sealing end, and the other end of the second gland body is provided with a second gland through hole; the exhaust port is provided at the gland sealing end and communicates with the second gland through hole. The diameter of the first pressure cover through hole is equal to the diameter of the second pressure cover through hole, and the diameter of the first pressure cover through hole is larger than the diameter of the lower valve. One end of the first pressure cap body is connected to one end of the second pressure cap body, and the first pressure cap through hole is aligned with and connected to the second pressure cap through hole; after connection, the first pressure cap through hole and the second pressure cap through hole constitute the main through hole of the pressure cap.

10. The two-position three-way solenoid valve according to claim 9, characterized in that, The upper valve seal, gasket, skeleton sealing structure, first lower housing seal, second lower housing seal, and third lower housing seal are all rubber O-rings.

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