CN114439988A

CN114439988A - Electromagnetic valve

Info

Publication number: CN114439988A
Application number: CN202011194122.0A
Authority: CN
Inventors: 陈其功; 张克鹏
Original assignee: Dunan Environment Technology Co Ltd
Current assignee: Dunan Environment Technology Co Ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2022-05-06
Anticipated expiration: 2040-10-30
Also published as: CN114439988B

Abstract

The present invention provides a solenoid valve, comprising: a housing having a valve port; the static iron core is provided with a first static attraction surface and a second static attraction surface; the movable iron core assembly comprises a first movable iron core and a second movable iron core which can move mutually; the reset assembly comprises a first reset piece and a second reset piece, the first reset piece is arranged between the first movable iron core and the static iron core, and the second reset piece is arranged between the second movable iron core and the first movable iron core; the first movable iron core is provided with a first movable attraction surface corresponding to the first static attraction surface, the second movable iron core is provided with a second movable attraction surface corresponding to the second static attraction surface, and the interval between the first movable attraction surface and the first static attraction surface is larger than or smaller than the interval between the second movable attraction surface and the second static attraction surface. Through the technical scheme that this application provided, can solve the unable problem of guaranteeing the maximum valve opening pressure differential of valve member when increasing valve member circulation ability among the prior art.

Description

Electromagnetic valve

Technical Field

The invention relates to the technical field of electromagnetic valves, in particular to an electromagnetic valve.

Background

At present, an electromagnetic valve includes a housing, a stationary core and a movable core, the housing is provided with a valve port, the stationary core is fixedly disposed on the housing, and the movable core can be driven by the stationary core to move in the housing to open or close the valve port.

In the prior art, increasing the distance between the movable iron core and the valve port in the valve opening state is an effective means for increasing the flow capacity of the valve element, but such an improvement must increase the stroke of the movable iron core, that is, increase the distance between the movable iron core and the stationary iron core (air gap distance), which results in that the electromagnetic force generated between the movable iron core and the stationary iron core in the energized state is greatly reduced, thereby reducing the maximum valve opening pressure difference of the valve element.

Therefore, the prior art has the problem that the maximum valve opening pressure difference of the valve element cannot be ensured while the flow capacity of the valve element is increased.

Disclosure of Invention

The invention provides an electromagnetic valve, which aims to solve the problem that the maximum valve opening pressure difference of a valve cannot be ensured while the flow capacity of the valve cannot be increased in the prior art.

The present invention provides a solenoid valve, comprising: a housing having a valve port; the static iron core is arranged on the shell and provided with a first static attraction surface and a second static attraction surface; the movable iron core assembly is movably arranged in the shell and positioned between the static iron core and the valve port so as to open or close the valve port, and the movable iron core assembly comprises a first movable iron core and a second movable iron core which can move mutually; the reset assembly comprises a first reset piece and a second reset piece, the first reset piece is arranged between the first movable iron core and the static iron core, and the second reset piece is arranged between the second movable iron core and the first movable iron core; the first movable iron core is provided with a first movable attraction surface corresponding to the first static attraction surface, the second movable iron core is provided with a second movable attraction surface corresponding to the second static attraction surface, and the interval between the first movable attraction surface and the first static attraction surface is larger than or smaller than the interval between the second movable attraction surface and the second static attraction surface.

By applying the technical scheme of the invention, the electromagnetic valve comprises a shell, a static iron core, a movable iron core assembly and a reset assembly. The movable iron core component is divided into a first movable iron core and a second movable iron core, and the first movable iron core and the second movable iron core are matched to open or close the valve port. The interval between the first dynamic suction surface and the first static suction surface is larger than or smaller than the interval between the second dynamic suction surface and the second static suction surface. When the electromagnetic valve is electrified, one of the first movable iron core and the second movable iron core, which has a smaller interval with the static iron core, can move towards the static iron core firstly until the movable iron core with the smaller interval is contacted with the static iron core. At the less in-process that moves the iron core and remove in interval, under the effect that the second resets, the less iron core that moves in interval can drive another interval great move the iron core and move towards quiet iron core in step, after the less iron core that moves in interval contacts with quiet iron core, the great iron core that moves in interval can continue to move towards quiet iron core, realizes the segmentation and opens the valve to can increase the distance that moves between iron core and the valve port under the open valve state, increase the circulation ability of valve member. Moreover, by adopting the structure, the maximum valve opening pressure difference of the valve can be ensured without increasing the distance between the movable iron core and the static iron core in the valve closing state.

Furthermore, the end wall of the static iron core facing the movable iron core assembly is a static attraction surface, a boss or a groove is arranged on the static attraction surface, a first static attraction surface is formed on the part of the static attraction surface, which is positioned on the periphery of the boss or the groove, and a second static attraction surface is formed on the end wall of the boss or the groove bottom of the groove. The mode of setting up recess or boss has simple structure, the advantage of being convenient for process, can reduce the processing cost.

Further, the first movable iron core is provided with a mounting hole, and the second movable iron core is movably arranged in the mounting hole in a penetrating mode. By adopting the structure, the installation space occupied by the first movable iron core and the second movable iron core can be reduced, the integration level of the device is convenient to promote, and the miniaturization of the device is realized.

Further, the mounting hole includes first hole section, second hole section and the third hole section of connecting in order, and the aperture of first hole section is greater than the aperture of second hole section, and the aperture of second hole section is less than the aperture of third hole section, and first piece that resets is located first hole section, and the second resets and is located the second hole section. The hole pattern of the mounting hole is set to be in the shape, so that the first reset piece and the second reset piece can be assembled conveniently.

Further, move the iron core subassembly and still include sealed the pad, sealed pad includes interconnect's main part and sealed convex part, and the main part moves the iron core with the second and is connected, and the one end of keeping away from the second hole section of third hole section has the annular turn-ups, and the main part is lapped and is established on the annular turn-ups, and sealed convex part is worn out and is corresponded the valve port setting by the annular turn-ups. When the solenoid valve circular telegram, first movable iron core can take the second at first to move towards quiet iron core, because the sealed main part of filling up is set up on annular turn-over, the valve port can be kept away from in step to sealed the pad, realizes that first section opens the valve. After first movable iron core and the laminating of quiet iron core mutually, the second movable iron core can continue to move towards quiet iron core, because the main part is connected with the second movable iron core, sealed pad can continue to move towards the direction of keeping away from the valve port, realizes that the second section opens the valve, can guarantee the biggest of valve member and open the valve pressure differential when increasing the circulation ability of valve member.

Furthermore, the first reset piece is a first reset spring, the first reset spring is sleeved on the second movable iron core, one end of the first reset spring is abutted against the static iron core, and the other end of the first reset spring is abutted against the end wall of the second hole section facing the first hole section; the second piece that resets is second reset spring, and second reset spring overlaps and establishes on the second moves the iron core, and second reset spring's one end and the end wall looks butt towards the third hole section of second hole section, second reset spring's the other end and the main part looks butt. After the electromagnetic valve is powered off, the first movable iron core moves towards the valve port to realize resetting under the action of elastic force of the first return spring. After the electromagnetic valve is powered off, the second movable iron core moves towards the valve port to realize resetting under the action of the elastic force of the second return spring.

Further, move the iron core subassembly and still include the valve head that corresponds the valve port setting, the first one end of moving the iron core of keeping away from quiet iron core has the intercommunicating pore and is used for holding the chamber that holds of valve head, and the one end and the third pore section of intercommunicating pore communicate, and the other end of intercommunicating pore is linked together with holding the chamber. The cavity is accommodated through the arrangement, the valve head is limited by the accommodating cavity, and the valve head can not be separated from a preset moving range when the valve is opened.

Furthermore, the first reset piece is a first reset spring, the first reset spring is sleeved on the second movable iron core, one end of the first reset spring is abutted against the static iron core, and the other end of the first reset spring is abutted against the end wall of the second hole section facing the first hole section; the second reset piece is a second reset spring, the second reset spring is sleeved on the second movable iron core, one end of the second reset spring is abutted to the end wall, facing the third hole section, of the second hole section, and the other end of the second reset spring is connected with the second movable iron core. After the electromagnetic valve is powered off, the first movable iron core moves towards the valve port to realize resetting under the action of elastic force of the first return spring. After the electromagnetic valve is powered off, the second movable iron core moves towards the valve port to realize resetting under the action of the elastic force of the second return spring. And when the electromagnetic valve is electrified, the second movable iron core drives the first movable iron core to move towards the static iron core through the second return spring.

Furthermore, the second movable iron core comprises a first section and a second section which are connected with each other, the diameter of the first section is larger than that of the second section, and the end wall of the first section, which is far away from the second section, is a second movable suction surface. By adopting the structure, under the condition that the weight of the second movable iron core is not overlarge, the second movable iron core can be ensured to have a large enough attraction surface, and the second movable iron core and the static iron core are ensured to have enough attraction.

Further, the casing includes interconnect's disk seat and sleeve, and the valve port setting is on the disk seat, and the one end of quiet iron core is fixed to be worn to establish in the sleeve, moves the mobilizable dress of wearing to establish in the sleeve of iron core subassembly. Through setting up the casing components of a whole that can function independently into disk seat and sleeve, be convenient for pack into parts such as quiet iron core and moving iron core subassembly in the casing.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 illustrates a cross-sectional view of a solenoid valve provided in accordance with an embodiment of the present invention;

fig. 2 shows a schematic structural view of the stationary core in fig. 1;

FIG. 3 shows a cross-sectional view of the stationary core of FIG. 1;

fig. 4 shows a schematic structural view of the first plunger in fig. 1;

FIG. 5 shows a cross-sectional view of the first plunger of FIG. 1;

fig. 6 shows a schematic structural view of the second plunger in fig. 1;

FIG. 7 shows a cross-sectional view of the second plunger of FIG. 1;

FIG. 8 shows a cross-sectional view of a solenoid valve provided in accordance with a second embodiment of the present invention;

fig. 9 shows a schematic structural view of the stationary core in fig. 8;

FIG. 10 shows a cross-sectional view of the stationary core of FIG. 8;

fig. 11 shows a schematic structural view of the first plunger in fig. 8;

FIG. 12 shows a cross-sectional view of the first plunger of FIG. 8;

FIG. 13 is a schematic diagram of the first plunger of FIG. 8 from another perspective;

fig. 14 is a schematic structural view of the second plunger in fig. 8;

fig. 15 shows a cross-sectional view of the second plunger of fig. 8.

Wherein the figures include the following reference numerals:

10. a housing; 11. a valve port; 12. a valve seat; 13. a sleeve; 20. a stationary core; 21. a first static attraction surface; 22. a second static attraction surface; 23. a boss; 24. a groove; 30. a movable iron core assembly; 31. a first movable iron core; 311. a first dynamic suction surface; 312. mounting holes; 3121. a first bore section; 3122. a second bore section; 3123. a third bore section; 313. annular flanging; 314. a communicating hole; 315. an accommodating chamber; 32. a second movable iron core; 321. a second dynamic suction surface; 322. a first stage; 323. a second stage; 33. a gasket; 331. a main body; 332. a sealing protrusion; 34. a valve head; 40. a reset assembly; 41. a first reset member; 42. a second reset member.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 7, a solenoid valve according to a first embodiment of the present invention includes a housing 10, a stationary core 20, a movable core assembly 30, and a reset assembly 40. The housing 10 has a valve port 11, the stationary core 20 is disposed on the housing 10, the movable core assembly 30 is movably disposed in the housing 10 and between the stationary core 20 and the valve port 11 to open or close the valve port 11, and the movable core assembly 30 includes a first movable core 31 and a second movable core 32 that are movable relative to each other. In the present embodiment, the stationary core 20 has a first stationary attraction surface 21 and a second stationary attraction surface 22, the first movable core 31 has a first movable attraction surface 311 disposed corresponding to the first stationary attraction surface 21, the second movable core 32 has a second movable attraction surface 321 disposed corresponding to the second stationary attraction surface 22, and the interval between the first movable attraction surface 311 and the first stationary attraction surface 21 is greater than or less than the interval between the second movable attraction surface 321 and the second stationary attraction surface 22.

The reset assembly 40 includes a first reset element 41 and a second reset element 42, the first reset element 41 is disposed between the first movable core 31 and the stationary core 20, the first movable core 31 can be reset by the first reset element 41, the second reset element 42 is disposed between the second movable core 32 and the first movable core 31, and the second movable core 32 can be reset by the second reset element 42. In addition, in the process that the movable iron core assembly 30 is switched from the valve closing state to the valve opening state, under the action of the second reset member 42, the first movable iron core 31 and the second movable iron core 32 can be ensured to move towards the stationary iron core 20 synchronously at first until one of the movable iron cores is in contact with the stationary iron core 20, and the other movable iron core continues to move towards the stationary iron core 20.

With the electromagnetic valve provided in this embodiment, when the electromagnetic valve is energized, the smaller one of the first movable iron core 31 and the second movable iron core 32, which is spaced from the stationary iron core 20, will first move toward the stationary iron core 20 until the smaller movable iron core is in contact with the stationary iron core 20. In the process that the less movable iron core in interval removed, under the effect of second piece 42 that resets, the less movable iron core in interval can drive another great movable iron core in interval and move towards quiet iron core 20 in step, and after the less movable iron core in interval contacted with quiet iron core 20, the great movable iron core in interval can continue to move towards quiet iron core 20, realizes the segmentation open valve to can increase the distance between movable iron core and the valve port 11 under the open valve state, increase the circulation ability of valve member. In addition, with the above structure, the maximum valve opening pressure difference of the valve can be ensured without increasing the distance between the movable iron core and the static iron core 20 in the valve closing state.

Wherein, the interval between the first dynamic suction surface 311 and the first static suction surface 21 is larger or smaller than the interval between the second dynamic suction surface 321 and the second static suction surface 22, which comprises the following two structures:

(1) the first dynamic suction surface 311 is flush with the second dynamic suction surface 321, and the first static suction surface 21 and the second static suction surface 22 have a height difference;

(2) the first static attraction surface 21 and the second static attraction surface 22 are flush, and the first dynamic attraction surface 311 and the second dynamic attraction surface 321 have a height difference.

The first movable iron core 31 and the second movable iron core 32 include the following two assembling structures;

(1) the first movable iron core 31 and the second movable iron core 32 are arranged side by side, and the top surfaces of the first movable iron core 31 and the second movable iron core 32 are both arranged corresponding to the static iron core 20;

(2) the first movable iron core 31 is sleeved on the outer side of the second movable iron core 32, or the second movable iron core 32 is sleeved on the outer side of the first movable iron core 31, and the top surfaces of the first movable iron core 31 and the second movable iron core 32 are both arranged corresponding to the static iron core 20.

As shown in fig. 3, in the present embodiment, the end wall of the stationary core 20 facing the movable core assembly 30 is a stationary attraction surface, a groove 24 is formed on the stationary attraction surface, a portion of the stationary attraction surface located at the outer periphery of the groove 24 forms a first stationary attraction surface 21, and a groove bottom of the groove 24 forms a second stationary attraction surface 22. The mode of setting up recess 24 has simple structure, the advantage of convenient to process, can reduce the processing cost.

Specifically, the first dynamic suction surface 311 and the second dynamic suction surface 321 are flush, and the interval between the first dynamic suction surface 311 and the first static suction surface 21 is smaller than the interval between the second dynamic suction surface 321 and the second static suction surface 22. When the electromagnetic valve is powered on, the first movable iron core 31 can firstly drive the second movable iron core 32 to move towards the static iron core 20, and after the first movable iron core 31 is attached to the static iron core 20, the second movable iron core 32 can continuously move towards the static iron core 20, so that segmented valve opening is realized, the circulation capacity of the valve is increased, and the maximum valve opening pressure difference of the valve is ensured.

In other embodiments, a boss 23 may be provided on the static attraction surface, a portion of the static attraction surface located at the periphery of the boss 23 forms a first static attraction surface 21, an end wall of the boss 23 forms a second static attraction surface 22, the first dynamic attraction surface 311 is flush with the second dynamic attraction surface 321, and the first dynamic attraction surface 311 is spaced apart from the first static attraction surface 21 by a distance greater than the second dynamic attraction surface 321 is spaced apart from the second static attraction surface 22. When the electromagnetic valve is powered on, the second movable iron core 32 firstly drives the first movable iron core 31 to move towards the static iron core 20, and after the second movable iron core 32 is attached to the static iron core 20, the first movable iron core 31 continuously moves towards the static iron core 20, so that segmented valve opening is realized, the circulation capacity of the valve is increased, and the maximum valve opening pressure difference of the valve is ensured.

As shown in fig. 4 and 5, in the present embodiment, the first movable core 31 has a mounting hole 312, and the second movable core 32 is movably disposed through the mounting hole 312. By adopting the structure, the installation space occupied by the first movable iron core 31 and the second movable iron core 32 can be reduced, the integration level of the device is convenient to promote, and the miniaturization of the device is realized.

The first movable iron core 31 and the second movable iron core 32 are coaxially disposed.

Specifically, the mounting hole 312 includes a first hole segment 3121, a second hole segment 3122, and a third hole segment 3123 connected in sequence, the first hole segment 3121 has a larger hole diameter than the second hole segment 3122, the second hole segment 3122 has a smaller hole diameter than the third hole segment 3123, the first restoring member 41 is located in the first hole segment 3121, and the second restoring member 42 is located in the second hole segment 3122. The hole pattern of the mounting hole 312 is set to the above-described shape, which facilitates the assembly of the first restoring member 41 and the second restoring member 42.

As shown in fig. 1, in the present embodiment, the plunger assembly 30 further includes a gasket 33, the gasket 33 includes a main body 331 and a sealing protrusion 332, the main body 331 is connected to the second plunger 32, an end of the third hole segment 3123 away from the second hole segment 3122 has an annular flange 313, the main body 331 is disposed on the annular flange 313, and the sealing protrusion 332 is protruded from the annular flange 313 and is disposed corresponding to the valve port 11.

When the electromagnetic valve is energized, the first movable iron core 31 will firstly bring the second movable iron core 32 to move towards the stationary iron core 20, and since the main body 331 of the sealing gasket 33 is set up on the annular flange 313, the sealing gasket 33 will synchronously move away from the valve port 11, thus realizing a first-stage valve opening. After the first movable iron core 31 is attached to the stationary iron core 20, the second movable iron core 32 will continue to move towards the stationary iron core 20, and since the main body 331 is connected to the second movable iron core 32, the gasket 33 will continue to move towards the direction away from the valve port 11, so as to realize a second-stage valve opening, thereby increasing the flow capacity of the valve and ensuring the maximum valve opening differential pressure of the valve.

In this embodiment, the cross-sectional shape of the main body 331 of the gasket 33 is the same as the hole type of the third hole section 3123, so that the gasket 33 does not rotate relative to the first plunger 31 when moving within the third hole section 3123.

As shown in fig. 1, in the present embodiment, the first restoring member 41 and the second restoring member 42 are both restoring springs. Specifically, the first restoring member 41 is a first restoring spring, the first restoring spring is sleeved on the second movable iron core 32, one end of the first restoring spring abuts against the stationary iron core 20, and the other end of the first restoring spring abuts against the end wall of the second hole section 3122 facing the first hole section 3121. After the solenoid valve is de-energized, the first plunger 31 will move toward the valve port 11 under the elastic force of the first return spring to achieve the return. The second reset piece 42 is a second reset spring, the second reset spring is sleeved on the second movable iron core 32, one end of the second reset spring is abutted with the end wall of the second hole section 3122 facing the third hole section 3123, and the other end of the second reset spring is abutted with the main body 331. After the solenoid valve is de-energized, the second plunger 32 will move toward the valve port 11 under the elastic force of the second return spring to achieve the return.

As shown in fig. 6 and 7, in the present embodiment, the second plunger 32 includes a first segment 322 and a second segment 323 connected to each other, the diameter of the first segment 322 is larger than that of the second segment 323, and the end wall of the first segment 322 far from the second segment 323 is the second dynamic suction surface 321. By adopting the structure, under the condition that the weight of the second movable iron core 32 is not overlarge, the second movable iron core 32 can be ensured to have a large enough attraction surface, and the second movable iron core 32 and the static iron core 20 can be ensured to have a sufficient attraction force.

As shown in fig. 1, in the present embodiment, the housing 10 includes a valve seat 12 and a sleeve 13 connected to each other, the valve port 11 is disposed on the valve seat 12, one end of the stationary core 20 is fixedly disposed in the sleeve 13, and the movable core assembly 30 is movably disposed in the sleeve 13. The housing 10 is provided separately from the valve seat 12 and the sleeve 13, so that the stationary core 20, the movable core assembly 30, and the like can be easily installed in the housing 10.

In the present embodiment, a step structure is provided on an outer wall of the stationary core 20, and one end of the stationary core 20 is inserted into the sleeve 13 and limits an assembly position of the stationary core 20 by the step structure.

As shown in fig. 8 to 15, a second embodiment of the present invention provides a solenoid valve, and the second embodiment differs from the first embodiment in that in the second embodiment, the plunger assembly 30 further includes a valve head 34 disposed corresponding to the valve port 11, one end of the first plunger 31, which is away from the stationary plunger 20, has a communication hole 314 and a receiving chamber 315 for receiving the valve head 34, one end of the communication hole 314 communicates with the third hole segment 3123, and the other end of the communication hole 314 communicates with the receiving chamber 315. By providing the accommodating cavity 315, the valve head 34 is limited by the accommodating cavity 315, and the valve head 34 is prevented from departing from the predetermined movable range when the valve is opened.

In this embodiment, the valve head 34 is a spherical structure.

In the second embodiment, the stationary attraction surface is provided with the boss 23, a portion of the stationary attraction surface located on the outer periphery of the boss 23 forms the first stationary attraction surface 21, an end wall of the boss 23 forms the second stationary attraction surface 22, the first movable attraction surface 311 is flush with the second movable attraction surface 321, and the interval between the first movable attraction surface 311 and the first stationary attraction surface 21 is greater than the interval between the second movable attraction surface 321 and the second stationary attraction surface 22. When the electromagnetic valve is powered on, the second movable iron core 32 firstly drives the first movable iron core 31 to move towards the static iron core 20, and after the second movable iron core 32 is attached to the static iron core 20, the first movable iron core 31 continuously moves towards the static iron core 20, so that segmented valve opening is realized, the circulation capacity of the valve is increased, and the maximum valve opening pressure difference of the valve is ensured.

As shown in fig. 8 and 12, in the second embodiment, the first restoring member 41 is a first restoring spring, the first restoring spring is sleeved on the second movable iron core 32, one end of the first restoring spring abuts against the stationary iron core 20, and the other end of the first restoring spring abuts against the end wall of the second hole section 3122 facing the first hole section 3121. After the solenoid valve is de-energized, the first plunger 31 will move toward the valve port 11 under the elastic force of the first return spring to achieve the return. The second reset piece 42 is a second reset spring, the second reset spring is sleeved on the second movable iron core 32, one end of the second reset spring is abutted to the end wall of the second hole section 3122 facing the third hole section 3123, and the other end of the second reset spring is connected to the second movable iron core 32. After the solenoid valve is de-energized, the second plunger 32 will move toward the valve port 11 under the elastic force of the second return spring to achieve the return. When the solenoid valve is energized, the second movable iron core 32 carries the first movable iron core 31 toward the stationary iron core 20 by the second return spring.

Through the device provided by the embodiment, the movable iron core is divided into the inner part and the outer part which are mutually independent, the static attraction surface of the static iron core 20 is divided into the inner part and the outer part in the form of a central slot or a boss in order to realize the sectional attraction, the problem of reduction of the maximum valve opening differential pressure caused by increase of the air gap distance can be effectively avoided, the loss of electromagnetic force is made up without increasing the radiuses of the movable iron core and the static iron core 20 and adopting a scheme of a large-size coil, and the material cost can be effectively saved.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … … surface," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A solenoid valve, characterized in that it comprises:

a housing (10) having a valve port (11);

the static iron core (20) is arranged on the shell (10), and the static iron core (20) is provided with a first static attraction surface (21) and a second static attraction surface (22);

the movable iron core assembly (30) is movably arranged in the shell (10) and is positioned between the static iron core (20) and the valve port (11) to open or close the valve port (11), and the movable iron core assembly (30) comprises a first movable iron core (31) and a second movable iron core (32) which can move mutually;

the reset assembly (40) comprises a first reset piece (41) and a second reset piece (42), the first reset piece (41) is arranged between the first movable iron core (31) and the static iron core (20), and the second reset piece (42) is arranged between the second movable iron core (32) and the first movable iron core (31);

wherein, first movable iron core (31) has the correspondence first movable attraction face (311) that first quiet attraction face (21) set up, second movable iron core (32) has the correspondence second movable attraction face (321) that second quiet attraction face (22) set up, first movable attraction face (311) with the interval of first quiet attraction face (21) is greater than or is less than second movable attraction face (321) with the interval of second quiet attraction face (22).

2. The electromagnetic valve according to claim 1, characterized in that the orientation of the stationary core (20) is that the end wall of the movable core assembly (30) is a stationary attraction surface, a boss (23) or a groove (24) is provided on the stationary attraction surface, the stationary attraction surface is located in the boss (23) or the part of the periphery of the groove (24) forms the first stationary attraction surface (21), the end wall of the boss (23) or the groove bottom of the groove (24) forms the second stationary attraction surface (22).

3. The solenoid valve according to claim 1 or 2, characterized in that said first plunger (31) has a mounting hole (312), said second plunger (32) being movably inserted in said mounting hole (312).

4. The solenoid valve according to claim 3, wherein the mounting hole (312) comprises a first hole section (3121), a second hole section (3122) and a third hole section (3123) connected in series, the first hole section (3121) has a hole diameter larger than that of the second hole section (3122), the second hole section (3122) has a hole diameter smaller than that of the third hole section (3123), the first restoring member (41) is located in the first hole section (3121), and the second restoring member (42) is located in the second hole section (3122).

5. The solenoid valve according to claim 4, wherein the plunger assembly (30) further comprises a gasket (33), the gasket (33) comprises a main body (331) and a sealing convex portion (332) which are connected with each other, the main body (331) is connected with the second plunger (32), an end of the third hole section (3123) far away from the second hole section (3122) is provided with an annular flange (313), the main body (331) is arranged on the annular flange (313), and the sealing convex portion (332) is penetrated by the annular flange (313) and is arranged corresponding to the valve port (11).

6. The solenoid valve of claim 5,

the first reset piece (41) is a first reset spring, the first reset spring is sleeved on the second movable iron core (32), one end of the first reset spring is abutted against the static iron core (20), and the other end of the first reset spring is abutted against the end wall, facing the first hole section (3121), of the second hole section (3122);

the second reset piece (42) is a second reset spring, the second reset spring is sleeved on the second movable iron core (32), one end of the second reset spring is abutted to the end wall of the third hole section (3123) towards the second hole section (3122), and the other end of the second reset spring is abutted to the main body (331).

7. The solenoid valve according to claim 4, wherein the plunger assembly (30) further comprises a valve head (34) disposed corresponding to the valve port (11), one end of the first plunger (31) away from the stationary plunger (20) is provided with a communication hole (314) and a receiving cavity (315) for receiving the valve head (34), one end of the communication hole (314) is communicated with the third hole section (3123), and the other end of the communication hole (314) is communicated with the receiving cavity (315).

8. The solenoid valve of claim 7,

the second resets piece (42) and is the second reset spring, the second reset spring cover is established on second movable iron core (32), the one end of second reset spring with the orientation of second hole section (3122) the end wall looks butt of third hole section (3123), the other end of second reset spring with second movable iron core (32) are connected.

9. The solenoid valve according to claim 1, characterized in that the second plunger (32) comprises a first section (322) and a second section (323) connected with each other, the diameter of the first section (322) is larger than that of the second section (323), and the end wall of the first section (322) far away from the second section (323) is the second dynamic suction surface (321).

10. The solenoid valve according to claim 1, wherein the housing (10) comprises a valve seat (12) and a sleeve (13) connected with each other, the valve port (11) is disposed on the valve seat (12), one end of the stationary core (20) is fixedly inserted into the sleeve (13), and the movable core assembly (30) is movably inserted into the sleeve (13).