Solenoid valve

Abstract

A solenoid valve comprising a core unit, a sleeve, a first spring, and a buffer material, wherein a portion of the core unit is located on an inner periphery of the sleeve, the sleeve includes a bottom, and the bottom is located at one end of the sleeve along the axial direction of the sleeve, the core unit includes a hole, the hole has a hole, and the hole has an opening in the core unit toward the bottom, at least a portion of the first spring is located in the hole, and along the axial direction of the sleeve, a portion of the buffer material is located between the bottom and the first spring, one end of the buffer material contacts the bottom, one end of the first spring contacts the buffer material, and the core unit is capable of contacting the buffer material, thus contributing to reducing return noise of the solenoid valve.

Description

[Technical field]

[0001] (CROSS REFERENCE TO RELATED APPLICATIONS) This application claims priority to a utility model patent application filed with the China Patent Office on November 24, 2020, bearing application number 202022747221.9 and entitled "Solenoid Valve", the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the field of fluid control, and more particularly to solenoid valves. [Background technology]

[0003] In the field of fluid control, a solenoid valve includes a core unit and a sleeve as control members that control whether a flow path is conductive or not. When the solenoid valve is operated, the return noise generated by the collision between the core unit and the sleeve is a technical problem that needs to be solved. Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a solenoid valve which contributes to a reduction in return noise generated by a collision between a core unit and a sleeve when the solenoid valve is operated. [Means for solving the problem]

[0005] An solenoid valve comprising a core unit, a sleeve, a first spring, and a cushioning material, a portion of the core unit being located on an inner circumference of the sleeve, the sleeve including a bottom portion, the bottom portion being located at one end of the sleeve along the axial direction of the sleeve, the core unit including a hole portion, the hole portion having a hole, the hole having an opening in the core unit toward the bottom portion, at least a portion of the first spring being located within the hole, a portion of the cushioning material being located between the bottom portion and the first spring along the axial direction of the sleeve, one end of the cushioning material contacting the bottom portion and one end of the first spring contacting the cushioning material, and the core unit being capable of contacting the cushioning material.

[0006] The solenoid valve includes a core unit, a sleeve, a first spring, and a buffer material, the buffer material is located between the bottom of the sleeve and the core unit, the first spring is located in the hole of the core unit, and one end of the first spring contacts the buffer material, so that the buffer material is fixed relative to the bottom of the sleeve. In this way, when the solenoid valve is powered off, the core unit will first contact the buffer material in the process of moving upward, which can further reduce the collision generated between the core unit and the bottom, and contribute to reducing the return noise of the solenoid valve. In addition, the buffer material is positionally limited and fixed by the first spring, which makes it convenient to install the buffer material without needing to change the structure of other parts of the solenoid valve. [Brief description of the drawings]

[0007] [Figure 1] 1 is a cross-sectional schematic diagram of a solenoid valve according to one technical solution of the present invention; [Diagram 2] FIG. 2 is a schematic diagram of a local cross-sectional structure of the solenoid valve of the first embodiment in a power outage state. [Diagram 3] FIG. 2 is a schematic diagram of a local cross-sectional structure of the solenoid valve of the first embodiment in an energized state. [Figure 4] FIG. 2 is a schematic perspective view of the cushioning material according to the first embodiment. [Diagram 5] FIG. 2 is a schematic diagram of a cross-sectional structure of the cushioning material of the first embodiment. [Figure 6]FIG. 11 is a schematic diagram of a local cross-sectional structure of a solenoid valve according to a second embodiment in a power outage state. [Figure 7] FIG. 11 is a schematic diagram of a local cross-sectional structure of a solenoid valve according to a third embodiment in a power outage state. [Figure 8] FIG. 13 is a schematic diagram of a local cross-sectional structure of a solenoid valve according to a fourth embodiment in a power outage state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The present invention will be further described below in conjunction with the drawings and specific embodiments. In the following description of the embodiments, for ease of understanding, terms indicating directions (e.g., "upper", "lower", etc.) will be used appropriately. Taking the solenoid valve in FIG. 1 as an example, it will be defined that the coil unit is located above the valve body, the valve body is located below the coil unit, and the axial direction of the solenoid valve is the up-down direction.

[0009] Combining FIG. 1, the solenoid valve 100 includes a valve body 1, a valve unit 2, a core unit 3, a coil unit 4, and a sleeve 5, a part of the valve unit 2 is located in the inner chamber of the valve body 1, a part of the sleeve 5 is located above the valve unit 2, one end of the sleeve 5 is fixedly connected to the valve unit 2 and sealed at the connection point, a part of the core unit 3 is located on the inner circumference of the sleeve 5 and located above the valve unit 2, and the coil unit 4 is fitted around the outer circumference of the part of the valve unit 2, the part of the core unit 3, and the part of the sleeve 5.

[0010] The valve unit 2 includes a valve seat 21, a valve body 22, and a suction part 23, the suction part 23 is located above the valve seat 21, in this embodiment, the suction part 23 and the valve seat 21 are integrally configured, in other embodiments, the suction part 23 and the valve seat 21 may be separate structures, the suction part 23 and the valve seat 21 are fixed by a method such as welding, bonding, or screwing, at least a part of the valve seat 21 is located in the inner chamber of the valve body 1 and fixed relatively to the valve body 1, the fixing method may be welding or screwing, in this embodiment, the valve seat 21 is screwed to the valve body 1. The solenoid valve 100 has a valve chamber 211, the valve chamber 211 is located between the valve body 1 and the valve seat 21, the walls forming the valve chamber 211 include the inner wall of the valve body 1 and the inner wall of the valve seat 21, the valve body 22 is located in the valve chamber 211 and can move along the axial direction of the solenoid valve 100 in the valve chamber 211. The sleeve 5 is a hollow cylindrical member having an opening at one end and a closed end at the other end. Specifically, the sleeve 5 includes a bottom 51 and an opening 52. Along the axial direction of the sleeve 5, the bottom 51 is located at one end of the sleeve 5, and the opening 52 is located at the other end of the sleeve 5. The bottom 51 is formed as a closed end of the sleeve 5, and the opening 52 is formed as an open end of the sleeve 5. The opening 52 of the sleeve 5 is fixedly connected to the upper end of the suction part 23 and sealed at the connection point. Specifically, the opening 52 of the sleeve 5 is fitted around the outer periphery of the upper end of the suction part 23, and the inner wall of the opening 52 is sealed and fixed to the outer wall of the upper end of the suction part 23, and the fixing method may be welding or bonding. A part of the core unit 3 is housed in the sleeve 5, and the core unit 3 is close to the bottom 51 relative to the valve unit 2, and when the solenoid valve 100 is not energized or is in a reset state, the core unit 3 can abut against the bottom 51.Specifically, the core unit 3 includes a movable core 31 and a valve rod 32. Along the axial direction of the solenoid valve 100, the movable core 31 is located above the attraction portion 23 and located on the inner circumference of the sleeve 5, or the movable core 31 is closer to the bottom 51 of the sleeve 5 than the attraction portion 23, and one end of the valve rod 32 is connected to the movable core 31 with a restricted position. After the solenoid valve 100 is energized, the other end of the valve rod 32 can contact the valve body 22, and the movable core 31 can move along the axial direction of the solenoid valve 100 in the sleeve 5. Furthermore, the movable core 31 can drive the valve rod 32 to move along the axial direction of the solenoid valve 100, thereby making the valve rod 32 contact or separate from the valve body 22. The coil unit 4 has a through hole, and a part of the attraction portion 23, a part of the core unit 3, and a part of the sleeve 5 are located in the through hole of the coil unit 4. The coil unit 4 is located above the valve body 1, and one end of the coil unit 4 is fixedly connected to the valve body 1. The valve body 1 is formed with a first passage 11, a second passage 12, and a valve port 13. The first passage 11 communicates with the valve chamber 211, and the valve port 13 communicates with the second passage 12. The working medium can enter the valve chamber 211 from the first passage 11. Then, when the valve body 22 moves away from the valve port 13, the working medium enters the second passage 12 through the valve port 13. When the solenoid valve 100 is energized or powered off, the movable core 31 can drive the valve rod 32 to move along the axial direction of the solenoid valve 100, and the valve rod 32 further drives the valve body 22 to move along the up-down direction of the valve unit 2 in the valve chamber 211, thereby opening and closing the valve port 13, thereby opening or closing the solenoid valve 100. In this embodiment, the axial direction of the solenoid valve 100 is the same as the axial direction of the sleeve 5.

[0011] 1 and 2 , the core unit 3 includes a hole portion 30, the hole portion 30 has a hole 310, and the hole 310 has an opening toward the bottom 51 of the core unit 3. Specifically, the hole 310 is formed in the movable core 31, and the hole 310 penetrates the upper and lower surfaces of the movable core 31 along the axial direction of the movable core 31. A part of the valve rod 32 is located in the hole 310 and is connected to the hole portion 30 with its position restricted. Specifically, the valve rod 32 includes a position restricting boss 320, and the position restricting boss 320 is formed at one end of the valve rod 32 along the axial direction of the valve rod 32. The valve rod 32 is inserted through the suction portion 23, and a position limiting boss 320 located at one end of the valve rod 32 engages with the hole 310, the hole 30 includes a large diameter section and a small diameter section, and a first stage section 311 is formed between the large diameter section and the small diameter section of the hole 30, the position limiting boss 320 is located at the large diameter section of the hole 30 and can move along the axial direction of the movable core 31 within the large diameter section, the position limiting boss 320 can abut against the first stage section 311, and the position limiting boss 320 forms a position limiting connection with the first stage section 310.

[0012] The solenoid valve 100 includes a first spring 33 and a second spring 34, both of which are compression coil springs. At least a part of the first spring 33 is located in the hole 310. Along the axial direction of the sleeve 5, the first spring 33 is located between the bottom 51 and the valve rod 32, and one end of the first spring 33 abuts against the position limiting boss 320. In this way, the first spring 33 constantly applies an elastic force to the valve rod 32, and the position limiting boss 320 abuts against the first stage portion 311, thereby contributing to the movement of the valve rod 32 in accordance with the operation of the movable core 31. As shown in FIG. 2, the second spring 34 is located between the movable core 31 and the attraction portion 23 along the axial direction of the sleeve 5, and the second spring 34 always applies an elastic force to the movable core 31. When the solenoid valve 100 is not energized, the attraction portion 23 does not generate electromagnetic attraction force, so that the movable core 31 is abutted against the bottom 51 of the sleeve 5 by the upward elastic force of the second spring 34, and the solenoid valve 100 is in an open state. As shown in FIG. 3, when the solenoid valve 100 is energized, the attraction portion 23 and the movable core 31 are magnetized, generating an electromagnetic attraction force between them. The movable core 31 moves downward against the elastic force of the second spring 34. The first spring 33 is always in contact with the position limiting boss 320, so that the position limiting boss 320 is connected to the first stage portion 311 in a position limited manner. The valve rod 32 moves downward in synchronization with the movable core 31 until the lower end of the valve rod 32 abuts against the valve disc 22 due to the elastic force of the first spring 33. The valve rod 32 pushes the valve disc 32 to move to the valve port 13 until the valve disc 22 closes the valve port 13. In this case, the valve rod 32 and the valve disc 22 are both in a sealed state, and the solenoid valve 100 completes the valve closing operation. As shown in FIG. 2, when the solenoid valve 100 loses power again, the movable core 31 is reset upward by the elastic force of the second spring 34, and the first stage portion 311 comes into contact with the position limiting boss 320, so that the movable core 31 drives the valve rod 32 to move upward together with the valve rod 32 until the valve rod 32 comes into contact with the bottom 51 of the sleeve 5. In this way, the valve rod 32 is separated from the valve body 22 by the drive of the movable core 31, and the solenoid valve 100 completes the opening operation.

[0013] 2 and 3, the solenoid valve 100 includes a buffer material 6, and a part of the buffer material 6 is located between the bottom 51 and the first spring 33 along the axial direction of the sleeve 6. Specifically, one end of the buffer material 6 contacts the bottom 51 along the axial direction of the sleeve 6, and the first spring 33 is located between the buffer material 6 and the valve rod 2, so that one end of the first spring 33 contacts the buffer material 33 and the other end of the first spring 33 abuts the valve rod, and a part of the buffer material 33 is located on the inner circumference of the first spring 33. Thus, the buffer material 6 is fixed between the sleeve 5 and the first spring 33 in the axial direction. It may also be interpreted that the buffer material 6 is fixed between the sleeve 5 and the core unit 3 in the axial direction because the first spring 33 is located in the core unit 3. As shown in FIG. 2, when the solenoid valve 100 is not energized, at least a portion of the cushioning material 6 is located within the hole 310 of the movable core 31, and the cushioning material 6 simultaneously contacts the first spring 33 and the movable core 31 on the axially opposite side of the side in contact with the bottom 51.

[0014] 4 and 5, the cushioning material 6 has a rubber structure with a cross section of approximately T-shape. Specifically, the cushioning material 6 includes a main body portion 61 and a branch portion 62. Along the axial direction of the solenoid valve 100, the branch portion 62 is located below the main body portion 61, and one end of the branch portion 62 is connected to the lower wall of the main body portion 61 almost vertically. Alternatively, the branch portion 62 protrudes from the lower wall of the main body portion 61, the branch portion 62 and the main body portion 61 are integrally molded, the outer diameter of the main body portion 61 is larger than the outer diameter of the branch portion 62, the main body portion 61 is molded as an approximately circular plate-like structure, and the branch portion 62 is molded as an approximately cylindrical structure. Such a design contributes to the stability of the structure of the cushioning material 6 and facilitates manufacturing and processing. The main body 61 includes a first wall 611 and a second wall 612, the first wall 611 is formed on the upper wall of the main body 61, the second wall 612 is formed on the lower wall of the main body 61, the branch portion 62 is connected to the second wall 612, and the branch portion 62 protrudes toward the movable core 31 relative to the second wall 612. At least a part of the buffer material 6 is located in the inner ring of the first spring 33, specifically, the branch portion 62 is fitted into the first spring 33, whereby the first wall 611 of the main body 61 contacts the bottom 51, and the second wall 612 contacts the first spring 33, thus the buffer material 6 is fixed in the axial direction, and when the solenoid valve 100 is powered off, the second wall 612 can also contact the movable core 31. Note that one end of the branch portion 62 away from the main body 61 is provided with a fillet, thus making it convenient for the branch portion 62 to be fitted into the inner ring of the first spring 33.

[0015] The working principle is as follows: as shown in Fig. 2, when the solenoid valve 100 is powered off, the movable core 31 moves axially upward in the sleeve 5 due to the elastic force of the second spring 34, and the movable core 31 abuts against the body 61 of the buffer material 6, specifically, the upper wall of the movable core 31 contacts the second wall 612, and the body 61 can provide a sufficient area for the movable core 33 to abut, and furthermore, the collision between the movable core 31 and the bottom 51 during the reset process can be eased, thereby reducing the return noise. In addition, as shown in FIG. 3, after the solenoid valve 100 is energized, the movable core 31 moves downward in the axial direction due to the solenoid valve force of the suction portion 23, the movable core 31 moves away from the buffer material 6, one end of the first spring 33 contacts the second wall 612, and the other end of the first spring 33 abuts against the valve rod 32 as it is. Therefore, due to the elastic force of the first spring 33, the buffer material 6 does not fall and can still be fixed in the axial direction.

[0016] 2, 3, 4 and 5, the first recess 63 is formed in the body 61, specifically, the first recess 63 has an opening on the surface of the first wall 611, and the first recess 63 is recessed inward relative to the surface of the first wall 611. Correspondingly, the sleeve 5 has a first protrusion 511, which is formed on the bottom 51 of the sleeve 5, and the first protrusion 511 protrudes from the lower surface of the bottom 511 toward the buffer material 6 along the axial direction of the sleeve 5, and the first protrusion 511 is located in the first recess 63 and contacts the first recess 63, thus restricting the position of the buffer material 6 in the radial direction relative to the sleeve 5, which further improves the stability of the installation of the buffer material 6 in the solenoid valve 100, and prevents the buffer material 6 from being displaced or coming out during the operation of the solenoid valve 100, thereby contributing to improving the practicality of the solenoid valve 100.

[0017] Of course, in other embodiments, the first recess 63 may be provided in the sleeve 5, and the first protrusion 511 may be provided in the buffer material 6. Specifically, as shown in Fig. 6, the sleeve 5 includes a first recess 63, which is molded in the bottom portion 51, and along the axial direction of the sleeve 5, the first recess 63 has an opening on the lower surface of the bottom portion 51 and is recessed inward relative to the lower surface of the bottom portion 51, the buffer material 6 includes a first protrusion 511, which is molded in the main body portion 62, which protrudes toward the bottom portion 51 relative to the first wall 611, and which is located in the first recess 63 and contacts the first recess 63 to form a radial position limit.

[0018] In another embodiment, referring to FIG. 7, the sleeve 5 includes a first recess 63, the first recess 63 is molded in the bottom 51, and the first recess 63 has an opening on the lower surface of the bottom 51 along the axial direction of the sleeve 5, and the first recess 63 is recessed inward relative to the lower surface of the bottom 51. A part of the buffer material 6 is located in the first recess 63, and the buffer material 6 is gap-fitted with the first recess 63, specifically, a part of the main body 61 is located in the first recess 63, the first wall 611 contacts the bottom wall of the first recess 63, the second wall 612 is located below the opening of the first recess 63, and the side wall of the main body 61 is gap-fitted with the side wall of the first recess 63. In this way, when the structure of the buffer material 6 does not need to be changed, the buffer material 6 is radially restricted in position relative to the sleeve 5, which improves the mounting stability of the buffer material 6 and simplifies the manufacturing process.

[0019] In another embodiment, referring to FIG. 8, the valve rod 32 includes a second protrusion 321, specifically, the second protrusion 321 is molded on the position limiting boss 320, and the second protrusion 321 protrudes from the upper surface of the position limiting boss 320 to the bottom 51 of the sleeve 5 along the axial direction of the valve rod 32. Correspondingly, the buffer material 6 has a receiving chamber 621, specifically, the receiving chamber 621 is molded on the branching portion 62, the receiving chamber 621 has an opening on the lower surface of the branching portion 62, and the receiving chamber 621 is recessed inward relative to the lower surface of the branching portion 62. The second protrusion 321 is located in the receiving chamber 621, and the second protrusion 321 is clearance-fitted with the receiving chamber 621. In this embodiment, the buffer material 6 is radially limited by the valve rod 32, which further improves the stability of the mounting of the buffer material 6.

[0020] The technical features of the above-mentioned embodiments can be combined in any manner, and for the sake of brevity, not all possible combinations of the technical features of the above-mentioned embodiments are described. However, any combination of these technical features should be considered to be within the scope of the present description, provided that there is no contradiction.

[0021] The above embodiments are only for the purpose of illustrating the present invention, without limiting the technical solutions described in the present invention. Although the present specification has already described the present invention in detail with reference to the above embodiments, as understood by those skilled in the art, those skilled in the art may still make amendments or equivalent substitutions to the present invention, and any technical solutions and improvements thereon that do not deviate from the spirit and scope of the present invention should be included within the scope of the claims of the present invention.

Claims

1. a solenoid valve including a core unit, a sleeve, a first spring, and a cushioning material, a portion of the core units being located on an inner circumference of the sleeve, the sleeve including a bottom portion, the bottom portion being located at one end of the sleeve along an axial direction of the sleeve, the core unit including a hole portion, the hole portion having a hole, the hole having an opening in the core unit toward the bottom portion, at least a portion of the first spring being located within the hole, a portion of the cushioning material being located between the bottom portion and the first spring along the axial direction of the sleeve, one end of the cushioning material being in contact with the bottom portion, one end of the first spring being in contact with the cushioning material, and the core unit being capable of contacting the cushioning material; The core unit includes a valve rod, and at least a portion of the first spring is located between the buffer material and the valve rod along an axial direction of the sleeve, and the other end of the first spring abuts against the valve rod, The valve stem includes a second protrusion, the second protrusion is molded on the position limiting boss of the valve stem and protrudes along the axial direction of the sleeve relative to the position limiting boss of the valve stem toward the bottom of the sleeve, the cushioning material has an accommodation chamber, the accommodation chamber has an opening in the cushioning material toward the position limiting boss of the valve stem, the second protrusion is located in the accommodation chamber, and the second protrusion is clearance-fitted with the accommodation chamber. A solenoid valve characterized by:

2. The core unit includes a movable core, the hole portion is located in the movable core, the hole penetrates the movable core along the axial direction of the sleeve, and a part of the valve rod is located in the hole and is connected to the hole portion in a positionally restricted manner.

2. The solenoid valve according to claim 1.

3. The solenoid valve further includes an attraction portion, the movable core is located on an inner circumference of the sleeve, and at least a portion of the movable core is closer to a bottom of the sleeve than the attraction portion; The valve stem includes a position limiting boss, the position limiting boss is molded on one end of the valve stem, the position limiting boss is located in the hole and is connected to the hole portion in a position limited manner, and the position limiting boss abuts against the other end of the first spring.

3. The solenoid valve according to claim 2.

4. The cushioning material includes a main body portion and a branch portion, the main body portion includes a first wall and a second wall, the first wall contacts the bottom portion, the second wall contacts the first spring, and the second wall is capable of contacting the movable core along the axial direction of the sleeve, the branch portion protrudes toward the movable core relative to the second wall, the branch portion and the main body portion are integral with each other, and the branch portion is fitted into the first spring.

4. The solenoid valve according to claim 2 or 3.

5. the solenoid valve includes a first protrusion and a first recess, one of the first protrusion and the first recess is provided on the bottom of the sleeve and the other is provided on the buffer material, and the first protrusion is located in the first recess; 5. The solenoid valve according to claim 4.

6. the cushioning material includes the first convex portion, the first convex portion is molded on the main body portion, the first convex portion protrudes from the first wall toward the bottom portion, the sleeve includes the first concave portion, the first concave portion is molded on the bottom portion, the first concave portion has an opening on a lower surface of the bottom portion along an axial direction of the sleeve and is concave with respect to the lower surface of the bottom portion, and the first convex portion and the first concave portion are in contact with each other.

6. The solenoid valve according to claim 5.

7. the sleeve includes the first protrusion, the first protrusion is molded on the bottom and protrudes from a lower surface of the bottom along an axial direction of the sleeve toward the buffer material, the buffer material includes the first recess, the first recess is molded on the main body portion, the first recess has an opening on a surface of the first wall and is recessed with respect to the surface of the first wall; 6. The solenoid valve according to claim 5.

8. the sleeve includes a first recess, the first recess is molded in the bottom, has an opening on a lower surface of the bottom along an axial direction of the sleeve and is recessed with respect to the lower surface of the bottom, a portion of the main body is located in the first recess, the first wall is in contact with a bottom wall of the first recess, the second wall is located below the opening of the first recess, and a side wall of the main body is gap-fitted with a side wall of the first recess.

5. The solenoid valve according to claim 4.

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