Solenoid valve

Abstract

The electromagnetic valve comprises a nozzle, an end socket, an assembly and an elastic piece, the assembly comprises an iron core and a first sealing piece limited to the iron core, the nozzle is provided with a first valve port part, the end socket is provided with a second valve port part, the assembly can axially move between the first valve port part and the second valve port part, and the elastic piece is pre-compressed between the iron core and the end socket; the nozzle is provided with circulation port parts located on the two sides of the first valve port part, and in the valve opening state, a medium enters from the first valve port part and is discharged through the circulation port parts; in the valve closing state, the assembly is far away from the second valve port part, the first sealing piece abuts against the first valve port part, and resilience force generated by deformation of the first sealing piece under the acting force of a medium is larger than elastic force of the elastic piece. The sealing valve can relatively guarantee the sealing reliability of the valve port.

Description

Technical Field

[0001] This application relates to the field of electromagnetic control technology, and particularly to a solenoid valve. Background Art

[0002] The solenoid valve structure includes a static iron core and a moving iron core assembly. The moving iron core assembly includes a moving iron core and a sealing plug. A spring is arranged between the moving iron core and the static iron core. The solenoid valve is provided with a valve port part. In the excited state, the moving iron core and the static iron core are attracted to each other, and the sealing plug moves relatively away from the valve port part. In the powered-off state, the exciting effect disappears, the sealing plug abuts against the valve port part, and the spring provides a valve closing force. Affected by the refrigerant pressure of the vertical connecting pipe, it is necessary to ensure the reliability of the seal as much as possible. Summary of the Invention

[0003] This application provides a solenoid valve that can relatively ensure the sealing reliability in the valve closed state.

[0004] The solenoid valve provided by this application includes a nozzle, a head, an assembly body, and an elastic member. The assembly body includes an iron core and a first seal member limited to the iron core. The nozzle is provided with a first valve port part, and the head is provided with a second valve port part. The assembly body can axially move between the first valve port part and the second valve port part. The elastic member is pre-compressed between the iron core and the head;

[0005] The nozzle is provided with flow port parts on both sides of the first valve port part. In the valve open state, the medium enters from the first valve port part and is discharged from the flow port parts;

[0006] In the valve closed state, the assembly body moves away from the second valve port part, the first seal member abuts against the first valve port part, and the resilience force generated by the deformation of the first seal member under the action of the medium is greater than the elastic force of the elastic member.

[0007] Through the optimized design of the solenoid valve structure in this application, the first seal member is limited to the iron core. In the valve closed state, the assembly body moves away from the second valve port part, the first seal member abuts against the first valve port part, and the resilience force generated by the deformation of the first seal member under the action of the medium is greater than the elastic force of the elastic member. In the valve closed state, the lower end surface of the first seal member is deformed by the high-pressure action of the medium to generate a resilience force. The resilience force generated by the first seal member under the action of the medium is set to be greater than the elastic force of the elastic member. The first seal member is not easily deformed by the high-pressure action. In the valve closed state, the reliability of the valve port seal can be relatively ensured. Description of the Drawings

[0008] Figure 1 It is a schematic diagram of an embodiment of the solenoid valve provided by this application.

[0009] Figure 2 is Figure 1 an enlarged view of the structure within the dashed square in

[0010] Figure 3is Figure 2 An enlarged view of the structure within the lower middle dashed circle;

[0011] Figure 4 is Figure 2 An enlarged view of the structure within the upper middle dashed circle.

[0012] The description of the reference numerals in the drawings is as follows:

[0013] 10 Sleeve;

[0014] 20 Nozzle, 201 First valve port part, 202 Flow port part, 302 First communication port part, 204 First transition cavity part;

[0015] 30 Head, 301 Second valve port part, 302 Second communication port part, 303 Second transition cavity part;

[0016] 40 Iron core, 401 First installation groove part, 402 Second installation groove part, 403 First limiting convex part, 403a First guiding inclined plane, 404 Second limiting convex part, 404a Second guiding inclined plane;

[0017] 50 First seal; 60 Second seal; 70 Elastic member; 80 First inner cavity part; 90 Second inner cavity part; 100 Gap part. Specific embodiments

[0018] The present application provides a solenoid valve. To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0019] As Figure 1 shown, in this embodiment, the solenoid valve at least includes a nozzle 20, a head 30, an assembly, and an elastic member 70.

[0020] Among them, the nozzle 20 is provided with a first valve port part 201 and flow port parts 202 located on both sides of the first valve port part 201,

[0021] Among them, the head 30 is provided with a second valve port part 301.

[0022] Among them, the assembly includes an iron core 40 and a first seal 50 limited to the iron core 40. The assembly can axially move between the first valve port part 201 and the second valve port part 301.

[0023] Among them, the elastic member 70 is pre-compressed between the iron core 40 and the head 30;

[0024] In the open valve state, the first valve port part 201 is opened, and the medium enters from the first valve port part 201 and is discharged from the flow port part 202.

[0025] In the closed valve state, the assembly is away from the second valve port 301, and the first seal 50 abuts against the first valve port 201 to close the first valve port 201. The resilience force generated by the deformation of the first seal 50 under the action of the medium is greater than the elastic force of the elastic member 70.

[0026] Since the first valve port 201 is the medium inlet port, the pressure inside the first valve port 201 is relatively high. As a result, the first seal 50 is prone to deformation under the high pressure when sealing the first valve port 201. After the first seal 50 is deformed to a certain extent, leakage points will appear in the first valve port 201. At this time, the medium will enter the valve from the leakage point area of the first valve port 201, resulting in an internal leakage problem of the solenoid valve. Moreover, once the medium passes through the first valve port 201 and enters the valve, the iron core 40 will move upward under the push of the high pressure at this time, thereby opening the first valve port 201, resulting in the problem that the solenoid valve cannot reach the rated working pressure.

[0027] In this application, through the optimized design of the solenoid valve structure, the first seal 50 is limited to the iron core 40. In the closed valve state, the assembly is away from the second valve port 301, and the first seal 50 abuts against the first valve port 201. The resilience force generated by the deformation of the first seal 50 under the action of the medium is greater than the elastic force of the elastic member 70. In the closed valve state, the lower end surface of the first seal 50 is deformed by the high pressure of the medium to generate a resilience force. The resilience force generated by the first seal 50 under the action of the medium is set to be greater than the elastic force of the elastic member. The first seal 50 is not easily deformed by the high pressure force, and the reliability of the valve port seal can be relatively guaranteed in the closed valve state.

[0028] Specifically, in the closed valve state, the resilience force F 密 generated by the deformation of the first seal 50 under the action of the medium 弹 and the elastic force F 密 of the elastic member 70 弹 have a ratio range of: 1.2 ≤ F 密 / F 弹 ≤ 1.5. With this design, the first seal 50 is of moderate hardness, not easily deformed under high pressure, and has a certain deformation when sealing the first valve port 201.

[0029] In the illustrated embodiment, the assembly further includes a second seal 60. The second seal 60 is limited to the iron core 40. In the open valve state, the assembly is away from the first valve port 201, and the second seal 60 abuts against the second valve port 301 to close the second valve port 301. That is to say, the first seal 50 is responsible for opening and closing the first valve port 201, and the second seal 60 is responsible for opening and closing the second valve port 301. In the open valve state, the first valve port 201 is open and the second valve port 301 is closed. In the closed valve state, the first valve port 201 is closed and the second valve port 301 is open.

[0030] Specifically, the first seal 50 and the second seal 60 can be provided integrally to form an integral seal. In this case, the iron core 40 can be provided with a through hole that extends from the upper end face of the iron core 40 to the lower end face of the iron core 40, and the integral seal is assembled in the through hole of the iron core 40. When the first seal 50 and the second seal 60 are provided integrally, the first seal 50 and the second seal 60 are preferably made of the same material. The materials of the first seal 50 and the second seal 60 can be rubber, PTFE, rubber bands, etc.

[0031] Alternatively, the first seal 50 and the second seal 60 can also be independent of each other. In this case, a first mounting groove portion 401 can be provided at one end (the lower end in the figure) of the iron core 40, and a second mounting groove portion 402 can be provided at the other end (the upper end in the figure) of the iron core 40. At least a part of the first seal 50 is assembled in the first mounting groove portion 401. At least a part of the second seal 60 is assembled in the second mounting groove portion 401. When the first seal 50 and the second seal 60 are independent of each other, the first seal 50 and the second seal 60 can be made of the same material or different materials. The materials of the first seal 50 and the second seal 60 can be rubber, PTFE, rubber bands, etc.

[0032] More specifically, the cross-sectional area of the first mounting groove portion 401 at the end relatively close to the first valve port portion 201 (the lower end in the figure) can be set to be smaller than the cross-sectional area at the end relatively far from the first valve port portion 201 (the upper end in the figure). In the figure (see Figure 3 ), this is achieved by providing a first limiting convex portion 403 that protrudes into the first mounting groove portion 401 at the end of the first mounting groove portion 401 relatively close to the first valve port portion 201 (the lower end in the figure). With this design, after assembly, the first seal 50 is limited between the first limiting convex portion 403 and the lower end face of the first mounting groove portion 401, so that the first seal 50 is not easily axially displaced relative to the iron core 40, thereby improving the sealing reliability of the first seal 50 for the first valve port portion 201.

[0033] Similarly, the cross-sectional area of the second mounting groove portion 402 at the end relatively close to the second valve port portion 301 (the upper end in the figure) can be set to be smaller than the cross-sectional area at the end relatively far from the second valve port portion 301 (the lower end in the figure). In the figure (see Figure 4 ), this is achieved by providing a second limiting convex portion 404 that protrudes into the second mounting groove portion 402 at the end of the second mounting groove portion 402 relatively close to the second valve port portion 301 (the upper end in the figure). With this design, after assembly, the second seal 60 is limited between the second limiting convex portion 404 and the upper end face of the second mounting groove portion 402, so that the second seal 60 is not easily axially displaced relative to the iron core 40, thereby improving the sealing reliability of the second seal 60 for the second valve port portion 301.

[0034] More specifically, as Figure 3 shown, at one end (the lower end in the figure) of the first limiting convex portion 403 relatively close to the first valve port portion 201, there is a first guiding inclined surface 403a. On the outer side of the first seal 50, there is a first conical surface E. The first guiding inclined surface 403a and the first conical surface E are obliquely aligned. With such a design, when assembling the iron core 40 and the first seal 50, under the guiding action of the first guiding inclined surface 403a of the iron core 40 and the top side surface E of the first seal 50, the first seal 50 can be quickly and smoothly inserted into the first installation groove portion 401 of the iron core 40.

[0035] More specifically, as Figure 4 shown, at one end (the upper end in the figure) of the second limiting convex portion 404 relatively close to the second valve port portion 301, there is a second guiding inclined surface 404a. On the outer side of the second seal 60, there is a second conical surface F. The second guiding inclined surface 404a and the second conical surface F are obliquely aligned. With such a design, when assembling the iron core 40 and the second seal 60, under the guiding action of the second guiding inclined surface 404a of the iron core 40 and the bottom side surface F of the second seal 60, the second seal 60 can be quickly and smoothly inserted into the second installation groove portion 402 of the iron core 40.

[0036] In the illustrated embodiment, as Figure 2 shown, the nozzle 20 is provided with a first transition cavity portion 204. The first transition cavity portion 204 is located between the first valve port portion 201 and the first seal 50. The cross-sectional area of the first transition cavity portion 204 is larger than the cross-sectional area of the first valve port portion 201. In the open valve state, when the medium flows from the first valve port portion 201 into the valve, it will first enter the first transition cavity portion 204. Since the cross-sectional area of the first transition cavity portion 204 is larger than the cross-sectional area of the first valve port portion 201, the volume of the medium expands and the pressure decreases after entering the first transition cavity portion 204. Therefore, the instantaneous impact force acting on the first seal 50 can be reduced, and the situation that the first seal 50 is instantaneously washed open when the pressure in the first valve port portion 201 suddenly rises can be avoided. Of course, the first transition cavity portion 204 may not be provided either.

[0037] In the illustrated embodiment, as Figure 2 shown, the head 30 is provided with a second transition cavity portion 303. The second transition cavity portion 303 is located between the second valve port portion 301 and the second seal 60. The cross-sectional area of the second transition cavity portion 303 is larger than the cross-sectional area of the second valve port portion 301. In the closed valve state, when the medium flows from the second valve port portion 301 to the outside of the valve, it will first enter the second transition cavity portion 303. Since the cross-sectional area of the second transition cavity portion 303 is larger than the cross-sectional area of the second valve port portion 301, the volume of the medium expands and the pressure decreases after entering the second transition cavity portion 303. Therefore, the instantaneous impact force acting on the second seal 60 can be reduced. Of course, the solenoid valve may not be provided with the second transition cavity portion 303 either.

[0038] In the illustrated embodiment, the solenoid valve further includes a sleeve 10. The nozzle 20 is connected to the lower end of the sleeve 10, and the end cap 30 is connected to the upper end of the sleeve 10. The assembly and the elastic member 70 are located inside the sleeve 10.

[0039] In the illustrated embodiment, a first inner cavity portion 80 is formed between the nozzle 20 and the assembly, a second inner cavity portion 90 is formed between the end cap 30 and the assembly, a clearance portion 100 is formed between the side wall of the sleeve 10 and the assembly, the nozzle 20 is provided with a first communication port portion 203, and the end cap 30 is provided with a second communication port portion 302;

[0040] In the valve-open state, the medium enters through the first communication port portion 203, passes through the first valve port portion 201, the first transition cavity portion 204, and the first inner cavity portion 80, and then is discharged through the flow port portion 202;

[0041] In the valve-closed state, the medium enters through the flow port portion 202, passes through the first inner cavity portion 80, the clearance portion 100, the second inner cavity portion 90, the second transition cavity portion 303, and the second valve port portion 301, and then is discharged through the second communication port portion 302.

[0042] More specifically, as Figure 1 shown, both the first communication port portion 203 and the second communication port portion 302 are provided with a variable cross-section segment and a large cross-section segment.

[0043] The cross-sectional area of the variable cross-section segment ( Figure 1 indicated by A in Figure 1 ) of the first communication port portion 203 gradually decreases from bottom to top. The small end of the variable cross-section segment of the first communication port portion 203 is connected to the first valve port portion 201, and the large cross-section segment (

[0044] indicated by B in Figure 1 ) of the first communication port portion 203 is connected to the large end of the variable cross-section segment of the first communication port portion 203. The cross-sectional area of the large cross-section segment of the first communication port portion 203 is larger than the cross-sectional area of the first valve port portion 201. Figure 1 The cross-sectional area of the variable cross-section segment (

[0045] Figure 1 indicated by D in Figure 1 ) of the second communication port portion 302 gradually decreases from top to bottom. The small end of the variable cross-section segment of the second communication port portion 302 is connected to the second valve port portion 301, and the large cross-section segment ( Figure 1 indicated by C in Figure 1 ) of the second communication port portion 302 is connected to the large end of the variable cross-section segment of the second communication port portion 302. The cross-sectional area of the large cross-section segment of the second communication port portion 302 is larger than the cross-sectional area of the second valve port portion 301.

[0045] The above uses specific examples to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A solenoid valve, characterized in that, The solenoid valve includes a nozzle (20), a head (30), an assembly, and an elastic member (70). The assembly includes an iron core (40) and a first seal (50) limited to the iron core (40). The nozzle (20) is provided with a first valve port portion (201), and the head (30) is provided with a second valve port portion (301). The assembly can axially move between the first valve port portion (201) and the second valve port portion (301), and the elastic member (70) is pre-compressed between the iron core (40) and the head (30). The nozzle (20) is provided with flow port portions (202) on both sides of the first valve port portion (201). In the open valve state, the medium enters from the first valve port portion (201) and is discharged from the flow port portions (202). In the closed valve state, the assembly is away from the second valve port portion (301), the first seal (50) abuts against the first valve port portion (201), and the resilience force generated by the deformation of the first seal (50) under the action of the medium is greater than the elastic force of the elastic member (70).

2. The solenoid valve according to claim 1, wherein In the closed valve state, the resilience force F generated by the deformation of the first seal (50) under the action of the medium 密 and the elastic force F of the elastic member (70) 弹 The ratio range is: 1.2 ≤ F 密 / F 弹 ≤ 1.

5.

3. The solenoid valve according to claim 2, wherein The assembly includes a second seal (60). The second seal (60) is limited to the iron core (40), and the first seal (50) and the second seal (60) are separately arranged. In the open valve state, the assembly is away from the first valve port portion (201), and the second seal (60) abuts against the second valve port portion (301).

4. The solenoid valve according to claim 3, wherein The iron core (40) is provided with a first installation groove portion (401) and a second installation groove portion (402). At least part of the first seal (50) is assembled in the first installation groove portion (401). The cross-sectional area of the first installation groove portion (401) at the end relatively close to the first valve port portion (201) is smaller than the cross-sectional area at the end relatively far from the first valve port portion (201). At least part of the second seal (60) is assembled in the second installation groove portion (402). The cross-sectional area of the second installation groove portion (402) at the end relatively close to the second valve port portion (301) is smaller than the cross-sectional area at the end relatively far from the second valve port portion (301).

5. The solenoid valve according to claim 4, wherein The first seal (50) and the second seal (60) are made of the same material; or, the first seal (50) and the second seal (60) are made of different materials.

6. The solenoid valve according to claim 4, wherein A first limiting convex portion (403) is provided at the end of the first installation groove portion (401) relatively close to the first valve port portion (201). The first limiting convex portion (403) protrudes into the first installation groove portion (401), and the first limiting convex portion (403) limits the first seal (50) in the first installation groove portion (401). A second limiting convex portion (404) is provided at the end of the second installation groove portion (402) relatively close to the second valve port portion (301). The second limiting convex portion (404) protrudes into the second installation groove portion (402), and the second limiting convex portion (404) limits the second seal (60) in the second installation groove portion (402).

7. The solenoid valve according to claim 6, characterized in that, One end of the first limiting convex part (403) relatively close to the first valve port part (201) is provided with a first guiding inclined surface (403a), and the outer side of the first sealing member (50) is provided with a first conical surface (E), and the first guiding inclined surface (403a) is obliquely aligned with the first conical surface (E); One end of the second limiting convex part (404) relatively close to the second valve port part (301) is provided with a second guiding inclined surface (404a), and the outer side of the second sealing member (60) is provided with a second conical surface (F), and the second guiding inclined surface (404a) is obliquely aligned with the second conical surface (F).

8. The solenoid valve according to claim 3, characterized in that, The nozzle (20) is provided with a first transition cavity part (204), the first transition cavity part (204) is located between the first sealing member (50) and the first valve port part (201), and the cross-sectional area of the first transition cavity part (204) is larger than the cross-sectional area of the first valve port part (201); The head (30) is provided with a second transition cavity part (303), the second transition cavity part (303) is located between the second sealing member (60) and the second valve port part (301), and the cross-sectional area of the second transition cavity part (303) is larger than the cross-sectional area of the second valve port part (301).

9. The solenoid valve according to claim 8, characterized in that, The solenoid valve includes a sleeve (10), the nozzle (20) and the head (30) are respectively connected to two ends of the sleeve (10), and the assembly and the elastic member (70) are located inside the sleeve (10).

10. The solenoid valve according to claim 9, wherein, A first inner cavity part (80) is formed between the nozzle (20) and the assembly, a second inner cavity part (90) is formed between the head (30) and the assembly, a gap part (100) is formed between the side wall of the sleeve (10) and the assembly, the nozzle (20) is provided with a first communication port part (203), and the head (30) is provided with a second communication port part (302); In the open valve state, the medium enters through the first communication port part (203), passes through the first valve port part (201), the first transition cavity part (204), and the first inner cavity part (80), and then is discharged from the flow port part (202); In the closed valve state, the medium enters through the flow port part (202), passes through the first inner cavity part (80), the gap part (100), the second inner cavity part (90), the second transition cavity part (303), and the second valve port part (301), and then is discharged from the second communication port part (302).

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