Normally open electromagnetic valve

Abstract

The utility model relates to a normally open type electromagnetic valve, relate to electromagnetic valve field, the valve body subassembly has the valve cavity in, the valve core sliding sets up in the valve cavity of valve body subassembly, the valve core has the valve core flow channel in, the valve core flow channel is linked with valve cavity and fluid export, the spring is installed in the valve cavity, the one end of spring and the one end of valve body subassembly abuts, its other end and the valve core abut, the coil fixed cover sets up on valve body subassembly, the coil is electrified, the valve core moves to sealed fluid import under the electromagnetic force, or the coil is de-energized, the valve core moves to open fluid import under the spring elasticity force. In the scheme spring force and fluid pressure are set up in the same direction, the valve core is in stable normally open state when working, avoids the abnormal closing of valve, drives the valve core to close with the electromagnetic force of coil, and control loop is simple, and response speed is fast. The electromagnetic valve design principle and structure are simple, and the number of parts is few, and the action performance and sealing performance are stable and reliable, and the weight is light, and the volume is small.

Description

Technical Field

[0001] This utility model relates to the field of solenoid valves, specifically to a normally open solenoid valve. Background Technology

[0002] When spacecraft operate in extreme space environments, their fluid control systems must possess characteristics such as high precision, low power consumption, long lifespan, and fail-safety. Normally open solenoid valves maintain a closed state when not energized, and can quickly cut off the fluid with only a short period of energization. This characteristic gives them unique advantages in scenarios such as propulsion system safety control, emergency adjustment of thermal control systems, and emergency pressure relief in fault conditions.

[0003] Spacecraft have extremely limited internal space, requiring the integration of complex systems such as propulsion, thermal control, and communication within a compact layout. Launch costs are exponentially related to weight, and every gram of weight reduction significantly lowers mission costs. Therefore, lightweight and miniaturized component design is essential. Maintenance is difficult during on-orbit operation, and components must operate stably in environments with vacuum, radiation, and extreme temperature fluctuations. Existing products cannot simultaneously meet the requirements of high performance, lightweight, high reliability, and high environmental adaptability.

[0004] The defects and shortcomings of existing technologies include:

[0005] 1. The product has a complex structure and large size, making it unsuitable for spacecraft and other equipment that are sensitive to weight and volume.

[0006] 2. Slow response speed and low reliability. It is prone to jamming and sealing failure in extreme environments, such as when subjected to water hammer or drastic fluctuations in pipeline pressure, causing the valve to close abnormally. Utility Model Content

[0007] The technical problem to be solved by this utility model is how to simplify the structure of normally open solenoid valves and improve their reliability.

[0008] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A normally open solenoid valve includes a valve body assembly, a spring, a valve core, and a coil. One end of the valve body assembly has a fluid inlet, and the other end has a fluid outlet. The valve body assembly has a valve cavity, and the valve core is slidably disposed in the valve cavity. The valve core has a valve core flow channel, which communicates with the valve cavity and the fluid outlet. The spring is installed in the valve cavity, with one end abutting against one end of the valve body assembly and the other end abutting against the valve core, and applying an elastic force to the valve core to move it away from the fluid inlet. The coil is fixedly sleeved on the valve body assembly and located outside the valve core. When the coil is energized, the valve core moves under the action of electromagnetic force to seal the fluid inlet, or when the coil is de-energized, the valve core moves under the action of the elastic force of the spring to open the fluid inlet.

[0009] The beneficial effects of this utility model are as follows: The normally open solenoid valve of this solution uses a spring as the reset mechanism, and the spring force and fluid pressure are set in the same direction, which can keep the valve core in a stable normally open state during operation, avoiding abnormal valve closure when water hammer or drastic fluctuations in pipeline pressure occur; the valve core is driven to close by the electromagnetic force generated by the coil, which has the advantages of simple control circuit and fast response speed. The design principle and structure of this normally open solenoid valve are simple, with few parts, stable and reliable action and sealing performance, and a service life of more than 400,000 operations, with a sealing performance of 1×10 -7 Pa·m 3 With a speed of less than / s, it has good environmental adaptability; at the same time, it has the advantages of light weight and small size, and can be used in the propulsion and thermal control systems of spacecraft such as spacecraft, satellites and deep space probes.

[0010] Based on the above technical solution, the present invention can be further improved as follows.

[0011] Furthermore, the valve core flow channel includes a main flow channel and branch flow channels. The main flow channel is arranged along the axial direction of the valve core and one end of it is connected to the fluid outlet. One end of the branch flow channel is connected to the main flow channel, and the other end of it is arranged radially along the valve core and extends obliquely towards the fluid inlet. The other end of the branch flow channel is connected to the valve cavity. Multiple branch flow channels are arranged at intervals along the circumference of the valve core.

[0012] The beneficial effect of adopting the above-mentioned further scheme is that the fluid flows into the valve chamber from the fluid inlet, flows into the main channel along the branch channels, and finally flows out from the fluid outlet. Multiple branch channels allow for rapid fluid outflow.

[0013] Furthermore, the normally open solenoid valve also includes a gasket, which is located between the inner wall of one end of the valve body assembly and the valve core, and the gasket is made of a non-magnetic metal material.

[0014] The beneficial effects of adopting the above-mentioned further solution are: non-magnetic metal materials are non-magnetic and have a magnetic shielding effect. When the coil is de-energized, the gasket can effectively isolate the magnetic circuit, quickly reduce the residual magnetism in the circuit, allow the valve core to reset quickly, and accelerate the valve's response speed.

[0015] Furthermore, the valve body assembly includes a main housing, a valve seat, and a valve cover. The main housing has a housing through hole. The valve seat is fixedly connected to one end of the housing through hole, and the valve cover is fixedly connected to the other end of the housing through hole. The valve seat has the fluid inlet, and the valve cover has the fluid outlet. The housing through hole between the valve seat and the valve cover forms the valve cavity.

[0016] The beneficial effect of adopting the above-mentioned further solution is that the valve body assembly has multiple structural components, which facilitates the assembly of the internal valve core.

[0017] Furthermore, the valve seat has a spring groove at one end facing the valve cavity, and one end of the spring is located in the spring groove.

[0018] The beneficial effect of adopting the above-mentioned further solution is that: the spring groove is opened on the valve seat for installing the spring, which can effectively prevent the spring from moving radially or becoming unstable.

[0019] Furthermore, the valve core includes a sealing block and an armature, the armature has the valve core flow channel, the sealing block is fixed at the end of the armature facing the fluid inlet, the valve seat has an annular valve seat cutting edge at the end facing the valve cavity, the valve seat cutting edge is coaxially arranged with the fluid inlet, and the valve seat cutting edge is either sealed or separated from the sealing block.

[0020] The beneficial effect of adopting the above-mentioned further solution is that the valve seat is designed with a valve seat cutting edge, and when the valve is closed, the valve seat cutting edge and the sealing block of the valve core can form a sealing pair with good performance.

[0021] Furthermore, the normally open solenoid valve also includes a filter, which is fixedly connected to one end of the housing through hole and located at the end of the valve seat facing away from the valve cavity.

[0022] The beneficial effects of adopting the above-mentioned further solutions are: the filter is used to filter impurities in the fluid, effectively preventing impurities and excess matter in the fluid from entering the valve and affecting the valve's sealing performance or causing the valve to jam.

[0023] Furthermore, the normally open solenoid valve also includes a pressure ring, which is fixedly connected to one end of the housing through hole and located between the filter and the valve seat.

[0024] The beneficial effect of adopting the above-mentioned further solution is that the pressure ring can press the valve seat tightly, preventing the valve seat from undergoing axial displacement and changing the valve opening.

[0025] Furthermore, the normally open solenoid valve also includes a first sealing ring and a second sealing ring. The first sealing ring is fitted outside the valve cover and seals with the through hole of the housing. The second sealing ring is fitted outside the main housing.

[0026] The beneficial effect of adopting the above-mentioned further solution is that the first sealing ring seals the gap between the housing through hole and the valve cover. When the normally open solenoid valve is connected to the downstream component, the second sealing ring is used to seal the main housing and the downstream component.

[0027] Furthermore, an annular groove is formed on the outer wall of the valve body assembly along its circumference, the coil is embedded in the annular groove, and a shielding cover is fixed to the outside of the annular groove.

[0028] The advantages of adopting the above-mentioned further solution are: slotting the outer wall of the valve body assembly and installing the coil facilitates installation; and the use of a shielding cover on the outside prevents the coil from being exposed, reducing the impact of the external environment.

[0029] The beneficial effects of this utility model include:

[0030] (1) It has a simple structure, small size and light weight, making it suitable for spacecraft and other equipment that are sensitive to weight and size.

[0031] (2) It has good sealing performance, fast response, and stable control. It can quickly change the fluid flow according to the electrical signal.

[0032] (3) Long lifespan and high reliability, suitable for spacecraft, satellites, deep space probes and other occasions that require long-term operation but are difficult to maintain; Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a normally open solenoid valve according to the present invention;

[0034] Figure 2 This is a partial enlarged view of the sealing block of a normally open solenoid valve according to this utility model.

[0035] The attached diagram lists the components represented by each number as follows:

[0036] 1. Filter; 2. Pressure ring; 3. Valve seat; 4. Spring; 5. Valve core; 501. Sealing block; 502. Armature; 6. Coil; 7. Valve cover; 8. First sealing ring; 9. Second sealing ring; 10. Gasket. Detailed Implementation

[0037] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0038] like Figures 1-2As shown, this embodiment provides a normally open solenoid valve, including a valve body assembly, a spring 4, a valve core 5, and a coil 6. One end of the valve body assembly has a fluid inlet, and the other end has a fluid outlet. The valve body assembly has a valve cavity, and the valve core 5 is slidably disposed in the valve cavity. The valve core 5 has a valve core flow channel, which communicates with the valve cavity and the fluid outlet. The spring 4 is installed in the valve cavity, with one end abutting against one end of the valve body assembly and the other end abutting against the valve core 5, applying an elastic force to the valve core 5 to move it away from the fluid inlet. The coil 6 is fixedly sleeved on the valve body assembly and located outside the valve core 5. When the coil 6 is energized, the valve core 5 moves under the action of electromagnetic force to seal the fluid inlet; or when the coil 6 is de-energized, the valve core 5 moves under the action of the elastic force of the spring 4 to open the fluid inlet.

[0039] The normally open solenoid valve in this design uses spring 4 as the reset mechanism. The spring force and fluid pressure are set in the same direction, ensuring that the valve core 5 remains stably open during operation. This prevents abnormal valve closure during water hammer or severe fluctuations in pipeline pressure. The valve core 5 is closed by the electromagnetic force generated by coil 6, offering advantages such as a simple control circuit and fast response. This normally open solenoid valve features a simple design principle and structure, few components, stable and reliable operating and sealing performance, a service life exceeding 400,000 cycles, and a sealing performance of 1×10⁻⁶. -7 Pa·m 3 With a speed of less than / s, it has good environmental adaptability; at the same time, it has the advantages of light weight and small size, and can be used in the propulsion and thermal control systems of spacecraft such as spacecraft, satellites and deep space probes.

[0040] Based on the above technical solution, the valve core flow channel includes a main flow channel and branch flow channels. The main flow channel is arranged along the axial direction of the valve core 5 and one end of it is connected to the fluid outlet. One end of the branch flow channel is connected to the main flow channel, and the other end of it is arranged radially along the valve core 5 and extends obliquely towards the side of the fluid inlet. The other end of the branch flow channel is connected to the valve cavity. Multiple branch flow channels are arranged at intervals along the circumference of the valve core 5.

[0041] Fluid flows into the valve chamber from the fluid inlet, flows into the main channel along the branch channels, and finally flows out from the fluid outlet. Multiple branch channels allow for rapid fluid outflow.

[0042] Furthermore, multiple branch channels are evenly distributed along the circumference of the valve core.

[0043] Based on the above technical solution, the normally open solenoid valve also includes a gasket 10, which is located between the inner wall of one end of the valve body assembly and the valve core 5. The gasket 10 is made of a non-magnetic metal material.

[0044] Non-magnetic metallic materials are non-magnetic and have a magnetic shielding effect. When the coil 6 is de-energized, the gasket 10 can effectively isolate the magnetic circuit, quickly reduce the residual magnetism in the circuit, and allow the valve core 5 to quickly reset, thus accelerating the valve's response speed.

[0045] Specifically, the gasket 10 is annular and coaxially arranged with the fluid inlet. The gasket 10 can be freely placed between the valve seat 3 and the valve core 5.

[0046] Based on the above technical solution, the valve body assembly includes a main housing, a valve seat 3, and a valve cover 7. The main housing has a housing through hole. The valve seat 3 is fixedly connected to one end of the housing through hole, and the valve cover 7 is fixedly connected to the other end of the housing through hole. The valve seat 3 has the fluid inlet, and the valve cover 7 has the fluid outlet. The housing through hole between the valve seat 3 and the valve cover 7 forms the valve cavity.

[0047] The valve body assembly consists of multiple structures, which facilitates the assembly of the internal valve core 5.

[0048] Based on the above technical solution, the valve seat 3 has a spring groove at one end facing the valve cavity, and one end of the spring 4 is located in the spring groove.

[0049] A spring groove is provided on the valve seat 3 for installing the spring 4, which can effectively prevent the spring 4 from moving radially or becoming unstable.

[0050] Specifically, the spring groove is an annular groove that is coaxially arranged with the fluid inlet and matches the diameter of the spring 4.

[0051] Based on the above technical solution, the valve core 5 includes a sealing block 501 and an armature 502. The armature 502 has the valve core flow channel. The sealing block 501 is fixed at one end of the armature 502 facing the fluid inlet. The valve seat 3 has an annular valve seat cutting edge at one end facing the valve cavity. The valve seat cutting edge is coaxially arranged with the fluid inlet. The valve seat cutting edge is either sealed or separated from the sealing block 501.

[0052] The valve seat 3 is designed with a valve seat cutting edge. When the valve is closed, the valve seat cutting edge and the sealing block 501 of the valve core 5 can form a high-performance sealing pair.

[0053] Specifically, such as Figure 2 As shown, the valve seat cutting edge is located at the end of the fluid inlet, and its outer wall is frustoconical. The wall thickness of the valve seat cutting edge gradually decreases from the direction away from to the direction close to the sealing block 501.

[0054] Based on the above technical solution, the normally open solenoid valve also includes a filter 1, which is fixedly connected to one end of the housing through hole and located at the end of the valve seat 3 facing away from the valve cavity.

[0055] Filter 1 is used to filter impurities in the fluid, effectively preventing impurities and foreign matter in the fluid from entering the valve and affecting the valve's sealing performance or causing the valve to jam.

[0056] Specifically, filter 1 has a filter screen, and the size of the filter screen mesh can be set according to the actual working environment.

[0057] Based on the above technical solution, the normally open solenoid valve also includes a pressure ring 2, which is fixedly connected to one end of the through hole of the housing and located between the filter 1 and the valve seat 3.

[0058] The pressure ring 2 can press the valve seat 3 tightly to prevent the valve seat 3 from undergoing axial displacement and changing the valve opening.

[0059] Specifically, such as Figure 1 As shown, one end of the housing through hole has a stepped hole, and the valve seat 3 has a large-diameter boss at the end. The boss abuts against the step of the stepped hole. The pressure ring 2 is screwed into the housing through hole by threads and abuts against the boss at the end of the valve seat 3 to limit the valve seat 3.

[0060] Based on the above technical solution, the normally open solenoid valve also includes a first sealing ring 8 and a second sealing ring 9. The first sealing ring 8 is sleeved on the valve cover 7 and seals with the through hole of the housing. The second sealing ring 9 is sleeved on the main housing.

[0061] The first sealing ring 8 seals the gap between the housing through hole and the valve cover 7. When the normally open solenoid valve is connected to a downstream component, the second sealing ring 9 is used to seal the main housing and the downstream component.

[0062] Based on the above technical solution, an annular groove is provided on the outer wall of the valve body assembly along its circumference, the coil 6 is embedded in the annular groove, and a shielding cover is fixed on the outside of the annular groove.

[0063] The coil 6 is installed by slotting the outer wall of the valve body assembly, which facilitates installation. A shielding cover is provided on the outside to prevent the coil 6 from being exposed and reduce the impact of the external environment.

[0064] The working principle of a normally open solenoid valve in this embodiment is as follows:

[0065] like Figure 1 As shown, when coil 6 is not energized, valve core 5 is opened by spring 4, and the valve is in the normally open state. Fluid flows into the valve chamber from the fluid inlet at the left end, passes through the valve core flow channel of valve core 5, and flows out from the fluid outlet. The fluid pressure generated by the fluid is in the same direction as the spring force, and the valve is stably maintained in the normally open state.

[0066] When coil 6 is energized, the generated electromagnetic force overcomes the spring force of spring 4 and the fluid pressure, attracting armature 502 to move to the left. The sealing block 501 and the valve seat edge of valve seat 3 form a reliable sealing pair, which can effectively cut off the fluid passage. When coil 6 is de-energized, the electromagnetic force disappears, and under the action of spring force, valve core 5 resets and continues to remain in the normally open state.

[0067] In the description of this utility model, it should be noted that the terms "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0068] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0069] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0070] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0071] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0072] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A normally open solenoid valve, characterized in that, The valve assembly includes a valve body assembly, a spring (4), a valve core (5), and a coil (6). One end of the valve body assembly has a fluid inlet, and the other end has a fluid outlet. The valve body assembly has a valve cavity. The valve core (5) is slidably disposed in the valve cavity. The valve core (5) has a valve core flow channel, which communicates with the valve cavity and the fluid outlet. The spring (4) is installed in the valve cavity. One end of the spring (4) abuts against one end of the valve body assembly, and the other end abuts against the valve core (5), and applies an elastic force to the valve core (5) to move it away from the fluid inlet. The coil (6) is fixedly sleeved on the valve body assembly and located outside the valve core (5). When the coil (6) is energized, the valve core (5) moves to seal the fluid inlet under the action of electromagnetic force, or when the coil (6) is de-energized, the valve core (5) moves to open the fluid inlet under the action of the elastic force of the spring (4).

2. The normally open solenoid valve according to claim 1, characterized in that, The valve core flow channel includes a main flow channel and a branch flow channel. The main flow channel is arranged along the axial direction of the valve core (5) and one end of it is connected to the fluid outlet. One end of the branch flow channel is connected to the main flow channel, and the other end of it is arranged radially along the valve core (5) and extends obliquely to one side of the fluid inlet. The other end of the branch flow channel is connected to the valve cavity. Multiple branch flow channels are arranged at intervals along the circumference of the valve core (5).

3. A normally open solenoid valve according to claim 1, characterized in that, It also includes a gasket (10), which is located between the inner wall of one end of the valve body assembly and the valve core (5), and the gasket (10) is made of a non-magnetic metal material.

4. A normally open solenoid valve according to claim 1, characterized in that, The valve body assembly includes a main housing, a valve seat (3) and a valve cover (7). The main housing has a housing through hole. The valve seat (3) is fixedly connected to one end of the housing through hole, and the valve cover (7) is fixedly connected to the other end of the housing through hole. The valve seat (3) has the fluid inlet, and the valve cover (7) has the fluid outlet. The housing through hole between the valve seat (3) and the valve cover (7) forms the valve cavity.

5. A normally open solenoid valve according to claim 4, characterized in that, The valve seat (3) has a spring groove at one end facing the valve cavity, and one end of the spring (4) is located in the spring groove.

6. A normally open solenoid valve according to claim 4, characterized in that, The valve core (5) includes a sealing block (501) and an armature (502). The armature (502) has the valve core flow channel. The sealing block (501) is fixed at one end of the armature (502) facing the fluid inlet. The valve seat (3) has an annular valve seat cutting edge at one end facing the valve cavity. The valve seat cutting edge is coaxially arranged with the fluid inlet. The valve seat cutting edge is sealed and engaged with or separated from the sealing block (501).

7. A normally open solenoid valve according to claim 4, characterized in that, It also includes a filter (1), which is fixedly connected to one end of the housing through hole and located at the end of the valve seat (3) facing away from the valve cavity.

8. A normally open solenoid valve according to claim 7, characterized in that, It also includes a pressure ring (2), which is fixedly connected to one end of the housing through hole and located between the filter (1) and the valve seat (3).

9. A normally open solenoid valve according to claim 4, characterized in that, It also includes a first sealing ring (8) and a second sealing ring (9). The first sealing ring (8) is fitted outside the valve cover (7) and seals with the through hole of the housing. The second sealing ring (9) is fitted outside the main housing.

10. A normally open solenoid valve according to any one of claims 1-9, characterized in that, The outer wall of the valve body assembly is provided with an annular groove along its circumference, the coil (6) is embedded in the annular groove, and a shielding cover is fixed on the outside of the annular groove.

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