CN219639456U - Electromagnetic valve - Google Patents

Abstract

The utility model provides an electromagnetic valve, and relates to the technical field of electromagnetic control. The electromagnetic valve comprises a valve body, a piston, a valve port seat, a valve bead, a valve core and a positioning sleeve; the valve body is provided with a valve cavity which is communicated with the valve body along the axial direction of the valve body; the piston is positioned in the valve cavity of the valve body and is in sliding connection with the cavity wall of the valve cavity, and the piston is provided with a piston cavity which is communicated along the axis of the piston; the valve port seat is at least partially inserted into a piston cavity of the piston, and is provided with a fluid through hole; the valve bead is accommodated in the valve cavity of the valve body; the valve core is arranged in a piston cavity of the piston and is positioned at one side of the valve port seat, which is away from the valve bead; the positioning sleeve is inserted into a piston cavity of the piston and sleeved outside the valve core, and one end of the positioning sleeve, which faces the valve bead, is abutted with the valve port seat; a sealing structure is arranged between at least the piston and the valve port seat; or sealing structures are arranged between the piston and the positioning sleeve and between the valve port seat and the positioning sleeve. Leakage can be prevented through the sealing structure, and the sealing effect is enhanced.

Description

Electromagnetic valve

Technical Field

The utility model relates to the technical field of electromagnetic control, in particular to an electromagnetic valve.

Background

The electromagnetic valve is an actuator for controlling the on-off and flow of fluid. In the related art, the solenoid valve includes a coil, a stationary core, a movable core, and a piston. Wherein, piston one end and movable iron core butt. When the coil is electrified to generate electromagnetic force, the movable iron core moves close to the static iron core, and the piston opens the valve port under the pushing of fluid to realize fluid communication; when the coil is powered off, the piston can block the valve port under the pushing of the movable iron core. However, when the piston seals the valve port, the conditions of insufficient sealing and fluid leakage in the piston exist, and the normal operation of the whole system is affected.

Disclosure of Invention

Accordingly, it is necessary to provide a solenoid valve capable of improving the sealing effect.

An electromagnetic valve comprises a valve body, a piston, a valve port seat, a valve bead, a valve core and a positioning sleeve; the valve body is provided with a valve cavity which is communicated with the valve body along the axial direction of the valve body; the piston is positioned in the valve cavity of the valve body and is in sliding connection with the cavity wall of the valve cavity, and the piston is provided with a piston cavity which is communicated along the axis of the piston; the valve port seat is at least partially inserted into a piston cavity of the piston, and is provided with a fluid through hole; the valve bead is accommodated in the valve cavity of the valve body and can move along the axial direction of the valve body so as to be plugged at one end of the fluid through hole of the valve port seat; the valve core is arranged in a piston cavity of the piston and is positioned at one side of the valve port seat, which is away from the valve bead; the valve core can move in the piston to be plugged at the other end of the fluid through hole of the valve port seat; the positioning sleeve is inserted into a piston cavity of the piston and sleeved outside the valve core, and one end of the positioning sleeve, which faces the valve bead, is abutted against the valve port seat; a sealing structure is arranged at least between the piston and the valve port seat; or sealing structures are arranged between the piston and the positioning sleeve and between the valve port seat and the positioning sleeve.

It is understood that the piston is capable of effecting control of the on-off of the fluid by sliding within the valve chamber. The valve port seat can be abutted with the valve bead so as to realize the blocking of fluid at the valve port seat. The valve core can move under the pushing of fluid to block the fluid channel of the valve port seat. The locating sleeve is sleeved outside the valve core to prevent the valve core from sliding out of the piston cavity. These structures cooperate to collectively accomplish fluid communication and occlusion. Through the arrangement of the sealing structure, when fluid is disconnected, the leakage of the fluid from a gap between the piston and the valve port seat or a gap between the valve port seat and the positioning sleeve can be prevented as much as possible, and the sealing effect can be enhanced.

In one embodiment, the sealing structure includes a first sealing structure located between the piston and the valve port seat.

It will be appreciated that by providing the first seal arrangement, leakage of fluid from the gap between the piston and the valve seat is prevented as much as possible.

In one embodiment, the first sealing structure is a sealing ring or an adhesive.

It can be understood that the sealing ring has good elasticity and rebound resilience and good sealing performance; the adhesive can fill the gaps and also has good sealing effect.

In one embodiment, when the sealing structure is a sealing ring, the number of the sealing rings is at least two, and at least two sealing rings are sequentially arranged along the axial direction of the piston.

It will be appreciated that the provision of more than two sealing rings can further enhance the sealing effect.

In one embodiment, the piston cavity forms a riveting part towards one end cavity wall of the valve bead; the valve port seat is provided with a pressing groove which is recessed inwards in the radial direction, and the riveting part can be pressed in the pressing groove under the action of external force.

It can be appreciated that the setting of the riveting portion can limit the valve port seat.

In one embodiment, the first sealing structure is located between the rivet portion and the press groove.

It will be appreciated that this arrangement can enhance the sealing effect under compression of the rivet.

In one embodiment, the sealing structure further comprises a second sealing structure, the second sealing structure is located between the piston and the positioning sleeve, and/or the sealing structure further comprises a third sealing structure, and the third sealing structure is located at the abutting position of the valve port seat and the positioning sleeve.

It is understood that by providing the second sealing structure and the third sealing structure, leakage of fluid from the gap between the piston and the positioning sleeve and the gap between the valve port seat and the positioning sleeve can be avoided as much as possible.

In one embodiment, the second sealing structure and the third sealing structure are both sealing rings or adhesives, or one of the second sealing structure and the third sealing structure is a sealing ring, and the other is an adhesive.

It can be understood that the sealing ring has good elasticity and rebound resilience and good sealing performance; the adhesive can fill the gaps and also has good sealing effect.

In one embodiment, the cavity wall of the piston is radially inwards protruded along the cavity wall to form a stepped surface; the second sealing structure is a first bulge which is outwards protruded from the positioning sleeve along the radial direction of the positioning sleeve, and the third sealing structure is a second bulge which is outwards protruded from the end surface of the valve port seat along the axial direction of the positioning sleeve; one end face of the first bulge is abutted with the step face, the other end face of the first bulge is abutted with the second bulge, and the first bulge is abutted with the cavity wall of the piston along the circumferential side wall of the first bulge; and a containing space is formed between the outer wall of the positioning sleeve and the wall of the piston cavity, the second bulge is inserted into the containing space, and the second bulge is abutted to the wall of the piston cavity along the circumferential side wall of the second bulge.

It will be appreciated that such an arrangement can extend the path of fluid leakage, creating an obstruction to flow in the event of fluid leakage, facilitating sealing of the fluid.

In one embodiment, the piston is provided with a balance hole penetrating along the axial direction of the piston, and the balance Kong Bi is arranged to leave the piston cavity.

It will be appreciated that the balance holes are provided to drain fluid to balance the pressure of the valve chamber on both sides of the piston as the piston moves.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present utility model, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following descriptions are only some embodiments of the present utility model, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

Fig. 1 is a cross-sectional view of a solenoid valve provided by the present utility model.

FIG. 2 is a cross-sectional view of one embodiment of the internal structure of a piston in a solenoid valve according to the present disclosure;

FIG. 3 is a cross-sectional view of another embodiment of the internal structure of a piston in a solenoid valve according to the present disclosure;

fig. 4 is a partial enlarged view at a in fig. 3.

Reference numerals: 100. an electromagnetic valve; 200. a first connection pipe; 300. a second connection pipe; 10. a valve body; 20. a piston; 30. a valve port seat; 40. a valve bead; 50. a valve core; 60. a positioning sleeve; 70. a power assembly; 80. a seal ring; 101. a valve cavity; 102. a first port; 103. a second port; 104. a first cavity; 105. a second cavity; 201. a piston chamber; 21. a step surface; 22. a riveting part; 23. a balance hole; 31. a fluid through hole; 32. pressing a groove; 33. a second protrusion; 61. a first protrusion; 71. a valve tube; 72. a stationary core; 73. a movable iron core; 74. and (3) a spring.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and the like are used in the description of the present utility model for the purpose of illustration only and do not represent the only embodiment.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" on a second feature may be that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through intermedial media. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature is less level than the second feature.

Unless defined otherwise, all technical and scientific terms used in the specification of the present utility model have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in the description of the present utility model includes any and all combinations of one or more of the associated listed items.

Example 1

Referring to fig. 1 to 4, the present utility model provides a solenoid valve 100, the solenoid valve 100 includes a valve body 10, the valve body 10 has a valve cavity 101 penetrating along its axial direction; specifically, the valve body 10 is further provided with a first port 102 and a second port 103, the first port 102 and the second port 103 are respectively communicated with the valve cavity 101, the first port 102 is connected with an external first connecting pipe 200, the second port 103 is connected with an external second connecting pipe 300, and the first connecting pipe 200 and the second connecting pipe 300 can be in fluid communication through the electromagnetic valve 100.

Further, as shown in FIG. 1, the solenoid valve 100 also includes a power assembly 70 and a piston 20. The power assembly 70 includes a coil, a stationary core 72, a spring 74, a moving core 73, and a valve tube 71. The valve tube 71 is connected to an end of the valve body 10 remote from the second port 103 and communicates with the valve chamber 101. The valve tube 71 is internally provided with a static iron core 72, a spring 74 and a movable iron core 73, the static iron core 72 and the movable iron core 73 are connected through the spring 74, and the spring 74 is in a compressed state. The static iron core 72 is fixedly arranged at one end of the valve tube 71 far away from the piston 20, the movable iron core 73 is movably arranged at one end close to the piston 20, a coil is arranged at the static iron core 72, and the coil is arranged outside the valve tube 71. The piston 20 is located in the valve chamber 101 of the valve body 10 and is slidably connected to the chamber wall of the valve chamber 101, and the piston 20 can block the second port 103.

When the coil is energized, electromagnetic force is generated between the static iron core 72 and the movable iron core 73, the static iron core 72 attracts the movable iron core 73 to move towards the static iron core 72, the piston 20 is pushed by fluid at the first port 102 or the second port 103 to move towards the movable iron core 73, and fluid communication can be achieved between the first port 102 and the second port 103. When the coil is de-energized, the electromagnetic force between the stationary core 72 and the movable core 73 is removed, and the movable core 73 moves toward the piston 20 under the action of the elastic force, pushing the piston 20 to block the second port 103.

As shown in fig. 1 and 2, in the embodiment of the present utility model, the solenoid valve 100 further includes a valve seat 30. The piston 20 has a piston chamber 201 penetrating along its own axis; the valve port seat 30 is at least partially inserted into the piston cavity 201 of the piston 20, and the valve port seat 30 is provided with a fluid through hole 31; the valve bead 40 is accommodated in the valve cavity 101 of the valve body 10, and can move along the axial direction of the valve body 10 to block one end of the fluid through hole 31 of the valve port seat 30. The valve bead 40 is specifically installed in the movable iron core 73, and when the coil is powered off, the valve bead 40 can abut against the end surface of the valve port seat 30, which faces the movable iron core 73, so as to realize sealing, and reduce the impact force of the movable iron core 73 on the piston 20 when the movable iron core 73 moves towards the piston 20.

As shown in fig. 1 and 2, the piston 20 is further provided with a balance hole 23 penetrating in the axial direction of the piston, and the balance hole 23 is provided so as to avoid the piston chamber 201. Specifically, a first cavity 104 is formed between the piston 20, the valve seat 30, the valve bead 40, the movable iron core 73 and the cavity wall of the valve body 10, and a second cavity 105 is formed between one end of the piston 20 away from the movable iron core 73 and the cavity wall of the valve body 10. As such, as the plunger 73 moves toward the piston 20, the volume of the second cavity 105 becomes smaller and smaller until the volume of the first cavity 104 is larger than the second cavity 105, and the gas in the second cavity 105 is compressed, so that the gas pressure in the first cavity 104 is smaller than the second cavity 105, and there is a tendency for the piston 20 to push toward the plunger 73. Therefore, the balance hole 23 is provided, so that the fluid at the first port 102 can be introduced into the first cavity 104, the pressure of the first cavity 104 is increased, the pressure of the first cavity 104 and the pressure of the second cavity 105 are balanced, and the blocking effect of the piston 20 on the second port 103 is enhanced.

As shown in fig. 1 and 2, in the embodiment of the present utility model, the solenoid valve 100 further includes a valve core 50 and a positioning sleeve 60, where the valve core 50 is installed in the piston cavity 201 of the piston 20 and is located at a side of the valve port seat 30 facing away from the valve bead 40; the valve core 50 can move in the piston 20 to be plugged at the other end of the fluid through hole 31 of the valve port seat 30; the positioning sleeve 60 is inserted into the piston cavity 201 of the piston 20 and sleeved outside the valve core 50, and one end of the positioning sleeve 60 facing the valve bead 40 is abutted against the valve port seat 30. In this way, the valve core 50 can block the fluid channel of the valve seat 30 under the pushing of the fluid, so as to avoid the reverse flow of the fluid at the second port 103 and the return of the fluid to the first port 102 through the first cavity 104 as much as possible. The positioning sleeve 60 can protect the valve core 50 from moving in the piston cavity 201, prevent the valve core 50 from sliding out of the piston cavity 201, and has the functions of limiting and guiding the valve core 50.

As shown in fig. 1 and 2, in the present embodiment, the sealing structure includes a first sealing structure, and the first sealing structure is located between the piston 20 and the valve seat 30. In this way, the tightness between the cavity wall of the piston 20 and the outer wall of the valve seat 30 can be enhanced, so that the leakage of the fluid in the first cavity 104 from the gap between the cavity wall of the piston 20 and the outer wall of the valve seat 30 can be avoided as much as possible, and the pressure balance between the first cavity 104 and the second cavity 105 can be maintained.

As shown in fig. 1 and 2, for better mounting the valve seat 30, the piston chamber 201 forms a rivet 22 toward one end wall of the valve bead 40; the valve port seat 30 is configured with a pressing groove 32 recessed radially inwards, and the riveting portion 22 can be pressed in the pressing groove 32 under the action of external force. In this way, the riveting portion 22 can limit the movement of the valve port seat 30 along the axial direction thereof, so that the valve port seat 30 is stably installed in the piston cavity 201.

In a further embodiment, the first seal is located between the swage 22 and the swage groove 32. In this way, since the fluid first flows through the caulking portion 22 when leaking, this arrangement can seal at the beginning of the fluid leak, and the effect is better. The riveting portion 22 has a pressing force, so that the first sealing structure is pressed between the riveting portion 22 and the wall of the pressing groove 32, and the sealing performance is improved.

Specifically, the first sealing structure is provided with two alternative ways. The first way is: the first seal arrangement employs a seal ring 80. Accordingly, for better installation, as shown in fig. 2 and 3, an installation groove recessed radially along the outer wall of the valve seat 30 is provided on the outer wall of the valve seat 30, the installation groove extends along the circumferential direction of the valve seat 30, the sealing ring 80 is installed in the installation groove, and the sealing ring 80 is pressed between the wall of the installation groove and the cavity wall of the piston 20. In this manner, the seal ring 80 has good resiliency and rebound resilience to enhance the seal between the piston 20 and the valve seat 30. The second way is: the first sealing structure adopts an adhesive. In this way, the adhesive can permeate between the cavity wall of the piston and the outer wall of the valve seat 30, condense after a period of time, have a filling effect on the gap between the cavity wall of the piston 20 and the outer wall of the valve seat 30, and can also enhance the seal between the piston 20 and the valve seat 30.

Example two

In this embodiment, a solenoid valve 100 is provided, which is different from the solenoid valve 100 in the first embodiment in that the sealing structure further includes a second sealing structure on the basis of the first sealing structure in the first embodiment, and the second sealing structure is located between the piston 20 and the positioning sleeve 60. The remainder is the same as that described in embodiment one. That is, the first seal structure and the second seal structure are provided at the same time in the present embodiment. Thus, the second sealing structure is arranged, so that the sealing effect can be further enhanced on the basis of the first sealing structure. The effect of the first sealing structure can refer to the first embodiment, and the second sealing structure can enhance the tightness between the cavity wall of the piston 20 and the outer wall of the positioning sleeve 60, so as to avoid the leakage of the fluid in the first cavity 104 from the gap between the cavity wall of the piston 20 and the outer wall of the positioning sleeve 60 as much as possible, and facilitate maintaining the pressure balance between the first cavity 104 and the second cavity 105.

The arrangement of the sealing structure in this embodiment includes four alternatives. The first way is: the first seal and the second seal are both seals 80. The second way is: the first sealing structure and the second sealing structure both adopt an adhesive. Third mode: one of the first seal structure and the second seal structure is a seal ring 80, and the other is an adhesive. In the fourth mode, the first sealing structure adopts one of the sealing ring 80 and the adhesive, and the second sealing structure is a matched structure of a protrusion and a groove, namely, one of the piston 20 and the positioning sleeve 60 is provided with the protrusion along the radial direction of the piston, and the other is provided with the corresponding groove, and the protrusion extends into the groove and is matched with the groove wall of the groove so as to prolong the fluid leakage path. When the sealing ring 80 is used for sealing, a corresponding mounting groove is required to be provided for mounting the sealing ring 80, and the mounting of the sealing ring 80 can be specifically referred to in the first embodiment, and meanwhile, the effect of the sealing ring 80 and the adhesive can be referred to in the first embodiment, which is not described herein again.

Example III

In this embodiment, a solenoid valve 100 is provided, which is different from the solenoid valve 100 in the first embodiment in that the sealing structure further includes a third sealing structure on the basis of the first sealing structure in the first embodiment, and the third sealing structure is located between the valve port seat 30 and the positioning sleeve 60. The remainder is the same as that described in embodiment one. That is, the first seal structure and the third seal structure are provided at the same time in the present embodiment. Thus, the third sealing structure can further enhance the sealing effect on the basis of the first sealing structure. The effect of the first sealing structure may refer to the first embodiment, and the addition of the third sealing structure can enhance the tightness between the outer wall of the valve port seat 30 and the outer wall of the positioning sleeve 60, so as to avoid the leakage of the fluid in the first cavity 104 from the gap between the outer wall of the valve port seat 30 and the outer wall of the positioning sleeve 60 as much as possible, which is beneficial to maintaining the pressure balance between the first cavity 104 and the second cavity 105.

The arrangement of the sealing structure in this embodiment includes five alternative ways. The first way is: the first seal and the third seal are both seals 80. The second way is: the first sealing structure and the third sealing structure are both made of adhesive. Third mode: one of the first seal structure and the third seal structure is a seal ring 80, and the other is an adhesive. Fourth mode: as shown in fig. 3 and 4, the first sealing structure adopts one of a sealing ring 80 and an adhesive, and the third sealing structure is a matching structure of a protrusion and a groove, that is, one of the valve port seat 30 and the positioning sleeve 60 is provided with a protrusion along the axial direction of the valve port seat, and the other is provided with a corresponding groove, and the protrusion extends into the groove and is matched with the groove wall of the groove so as to prolong the fluid leakage path. A fifth mode: the first sealing structure adopts one of a sealing ring 80 and an adhesive; the cavity wall of the piston 20 is protruded inwards along the radial direction of the piston to form a step surface 21, the second sealing structure is a first protrusion 61 which is protruded outwards along the radial direction of the positioning sleeve 60, the third sealing structure is a second protrusion 33 which is protruded towards the positioning sleeve 60 along the axial direction of the valve port seat 30, one end surface on the first protrusion 61 is abutted with the step surface 21, the other end surface is abutted with the second protrusion 33, and the first protrusion 61 is abutted with the cavity wall of the piston 20 along the circumferential side wall of the piston; an accommodating space is formed between the outer wall of the positioning sleeve 60 and the cavity wall of the piston 20, the second bulge 33 is inserted into the accommodating space, and the second bulge 33 is abutted with the cavity wall of the piston 20 along the circumferential side wall of the second bulge. Thus, when fluid leakage occurs, the arrangement can prolong the fluid flow path, increase the obstruction of the fluid flow, slow down the fluid leakage speed, and block the fluid even when the leakage is not serious, thereby playing a certain sealing role.

When the sealing ring 80 is used for sealing, a corresponding mounting groove is required to be provided for mounting the sealing ring 80, and the mounting of the sealing ring 80 can be specifically referred to in the first embodiment, and meanwhile, the effect of the sealing ring 80 and the adhesive can be referred to in the first embodiment, which is not described herein again.

Example IV

In this embodiment, a solenoid valve 100 is provided, which is different from the solenoid valve 100 in the second embodiment in that, on the basis of providing the first sealing structure and the second sealing structure in the second embodiment, a third sealing structure is provided between the valve port seat 30 and the positioning sleeve 60. The rest is the same as described in embodiment two. That is, the first sealing structure, the second sealing structure, and the third sealing structure are provided at the same time in the present embodiment. The effects of the first sealing structure, the second sealing structure and the third sealing structure may be divided into the first embodiment, the second embodiment and the third embodiment.

The arrangement of the sealing structure in this embodiment includes two types of alternatives.

The first mode is: the first sealing structure adopts one of a sealing ring 80 and an adhesive. The second sealing structure and the third sealing structure are both set as the sealing ring 80 or are both set as the adhesive or are both set as the matching structures of the protrusions and the grooves, or any two of the sealing ring 80, the adhesive and the matching structures of the protrusions and the grooves are selected to respectively correspond to the second sealing structure and the third sealing structure, and the contents of the first embodiment to the third embodiment can be referred to specifically, and are not listed here. In addition, the second sealing structure may be set to be the first protrusion, and the third sealing structure may be set to be the second protrusion, which are matched with each other, and the third embodiment is specifically referred to, and will not be described herein.

In the second mode, the first sealing structure adopts a matching structure of a protrusion and a groove, that is, one of the piston 20 and the valve port seat 30 is provided with the protrusion along the radial direction thereof, and the other is correspondingly provided with the groove, so that the protrusion can extend into the groove and be matched with the groove wall of the groove. For specific effects, reference is made to embodiment two. The second sealing structure and the third sealing structure are both set as the sealing ring 80 or the adhesive, or one of them is set as the sealing ring 80, and the other is set as the adhesive, which can refer to the second embodiment, and will not be described herein again.

It should be noted that, when the sealing ring 80 is used for sealing, a corresponding mounting groove is required to be provided for mounting the sealing ring 80, and the mounting of the sealing ring 80 can be specifically referred to the first embodiment, and meanwhile, the effect of the sealing ring 80 and the adhesive can also be referred to the first embodiment, which is not described herein again.

Example five

In the present embodiment, there is provided a solenoid valve 100, which is different from the solenoid valve 100 in the first embodiment in that a sealing structure is provided between the piston 20 and the positioning sleeve 60, and is a second sealing structure; a sealing structure is arranged between the valve port seat 30 and the positioning sleeve 60, and is a third sealing structure. That is, in the fifth embodiment, the first sealing structure may not be provided, and by providing the second sealing structure and the third sealing structure at the same time, the sealing performance between the cavity wall of the piston 20 and the outer wall of the valve port seat 30 can be enhanced, so that the leakage of the fluid in the first cavity 104 from the gap between the cavity wall of the piston 20 and the outer wall of the valve port seat 30 is avoided as much as possible, which is beneficial to maintaining the pressure balance between the first cavity 104 and the second cavity 105. The effects of the second sealing structure and the third sealing structure can refer to the second embodiment and the third embodiment, and are not described herein.

The arrangement of the sealing structure in this embodiment includes three alternative ways. The first way is: the second seal and the third seal are both seals 80. The second way is: the second sealing structure and the third sealing structure are both made of adhesive. Third mode: one of the second seal structure and the third seal structure is a seal ring 80, and the other is an adhesive. When the sealing ring 80 is used for sealing, a corresponding mounting groove is required to be provided for mounting the sealing ring 80, and the mounting of the sealing ring 80 can be specifically referred to in the first embodiment, and meanwhile, the effect of the sealing ring 80 and the adhesive can be referred to in the first embodiment, which is not described herein again.

It should be noted that, in the above specific alternative embodiments of the first sealing structure, the second sealing structure, and the third sealing structure, those skilled in the art may selectively set or combine according to actual needs, so as to meet the needs, and this is not described in any way.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of the utility model should be determined from the following claims.

Claims (10)

1. A solenoid valve, characterized by comprising

The valve body is provided with a valve cavity which is penetrated along the axial direction of the valve body;

the piston is positioned in the valve cavity of the valve body and is in sliding connection with the cavity wall of the valve cavity, and the piston is provided with a piston cavity which is communicated along the axis of the piston;

the valve port seat is at least partially inserted into a piston cavity of the piston, and is provided with a fluid through hole;

the valve bead is accommodated in the valve cavity of the valve body and can move along the axial direction of the valve body to block one end of the fluid through hole of the valve port seat;

the valve core is arranged in a piston cavity of the piston and is positioned at one side of the valve port seat, which is away from the valve bead; the valve core can move in the piston cavity to be blocked at the other end of the fluid through hole of the valve port seat;

the positioning sleeve is inserted into a piston cavity of the piston and sleeved outside the valve core, and one end of the positioning sleeve, which faces the valve bead, is abutted against the valve port seat;

a sealing structure is arranged at least between the piston and the valve port seat; or sealing structures are arranged between the piston and the positioning sleeve and between the valve port seat and the positioning sleeve.

2. The solenoid valve of claim 1, wherein the seal comprises a first seal located between the piston and the valve port seat.

3. The solenoid valve of claim 2 wherein said first sealing arrangement is a gasket or an adhesive.

4. A solenoid valve according to claim 3 wherein when said first seal is a seal ring, the number of said seal rings is at least two, and at least two of said seal rings are disposed in sequence along said piston axis.

5. The solenoid valve of claim 2 wherein a chamber wall of said piston chamber toward one end of said valve bead forms a rivet; the valve port seat is provided with a pressing groove which is recessed inwards in the radial direction, and the riveting part can be pressed in the pressing groove under the action of external force.

6. The solenoid valve of claim 5 wherein said first seal is located between said swage and said swage groove.

7. The solenoid valve of any one of claims 2-6, wherein the sealing structure further comprises a second sealing structure located between the piston and the spacer, and/or a third sealing structure located at an abutment of the valve port seat and the spacer.

8. The solenoid valve of claim 7 wherein the second seal and the third seal are each a gasket or an adhesive, or wherein one of the second seal and the third seal is a gasket and the other is an adhesive.

9. The solenoid valve of claim 7 wherein the chamber wall of the piston is radially inwardly convex to form a stepped surface; the second sealing structure is a first bulge which is outwards protruded from the positioning sleeve along the radial direction of the positioning sleeve, and the third sealing structure is a second bulge which is outwards protruded from the end surface of the valve port seat along the axial direction of the positioning sleeve;

one end face of the first bulge is abutted with the step face, the other end face of the first bulge is abutted with the second bulge, and the first bulge is abutted with the cavity wall of the piston along the circumferential side wall of the first bulge;

and a containing space is formed between the outer wall of the positioning sleeve and the wall of the piston cavity, the second bulge is inserted into the containing space, and the second bulge is abutted to the wall of the piston cavity along the circumferential side wall of the second bulge.

10. The solenoid valve of claim 1 wherein said piston is provided with a balance bore extending axially therethrough, said balance Kong Bi being disposed to clear said piston cavity.