CN217301819U - Electromagnetic valve - Google Patents

Abstract

The utility model provides a solenoid valve, it includes: the valve body is provided with an accommodating cavity and a valve port, and the valve port is arranged at one end of the valve body and is communicated with the accommodating cavity; the static core iron is arranged in the accommodating cavity and is opposite to the valve port; the movable core iron is movably arranged in the accommodating cavity and provided with a first end and a second end which are oppositely arranged, the first end is in force fit with the static core iron, and the second end faces the valve port; the valve core is positioned in the accommodating cavity and movably arranged at the second end of the movable core iron, the valve core is used for opening or closing the valve port, and when the movable core iron moves to a position close to the static core iron, the valve core has a static state and a motion state of synchronously moving with the movable core iron; the movable core iron is provided with an initial position, a matching position and an adsorption position which are arranged along the direction from the valve port to the static core iron, when the movable core iron is at the initial position, the valve core is in a static state, and after the movable core iron moves to the matching position, the valve core and the movable core iron synchronously move until the movable core iron moves to the adsorption position.

Description

Electromagnetic valve

Technical Field

The utility model relates to the technical field of valves, particularly, relate to a solenoid valve.

Background

At present, a normally closed solenoid valve generally comprises a valve body, a static core iron, a movable core iron and a valve core assembly. The valve body is provided with an accommodating cavity and a valve port communicated with the accommodating cavity, the static core iron, the movable core iron and the valve core assembly are all arranged in the accommodating cavity and distributed along the axis direction of the accommodating cavity, and the movable core iron and the valve core assembly are all movably arranged in the accommodating cavity. Wherein, the movable core iron and the static core iron are matched to enable the valve core to close the valve port or open the valve port.

However, in the existing normally closed electromagnetic valve, the movable core iron needs to drive the valve core assembly to move in the whole valve opening process, so that the pressure difference force which needs to be overcome by the movable core iron is large in the valve opening process, and the valve opening difficulty of the product is large.

SUMMERY OF THE UTILITY MODEL

The utility model provides a solenoid valve to solve the big problem of the degree of difficulty of opening the valve among the prior art.

The utility model provides a solenoid valve, it includes: the valve body is provided with an accommodating cavity and a valve port, and the valve port is arranged at one end of the valve body and is communicated with the accommodating cavity; the static core iron is arranged in the accommodating cavity and is opposite to the valve port; the movable core iron is movably arranged in the accommodating cavity and is provided with a first end and a second end which are oppositely arranged, the first end is in force fit with the static core iron, and the second end faces the valve port; the valve core is positioned in the accommodating cavity and movably arranged at the second end of the movable core iron, the valve core is used for opening or closing the valve port, and when the movable core iron moves to a position close to the static core iron, the valve core has a static state and a motion state of synchronously moving with the movable core iron; the movable core iron is provided with an initial position, a matching position and an adsorption position which are arranged along the direction from the valve port to the static core iron, when the movable core iron is at the initial position, the valve core is in a static state, and after the movable core iron moves to the matching position, the valve core and the movable core iron synchronously move until the movable core iron moves to the adsorption position.

Use the technical scheme of the utility model, when opening the valve, moving the in-process that the core iron moved to the cooperation position by initial position, the case remains static, and moves the pressure differential that the core iron need not overcome the case and receive this moment, when moving core iron and driving case synchronous motion, just need overcome the pressure differential of case. Specifically, when the valve is opened, the movable core iron moves towards the direction close to the static core iron under the action of electromagnetic force, and after the movable core iron moves to the matching position, the movable core iron drives the valve core to move towards the direction close to the static core iron synchronously until the movable core iron moves to the adsorption position, and the valve core completely opens the valve port. Because the electromagnetic force between the movable core iron and the static core iron and the distance between the movable core iron and the static core iron are in an exponential change relationship, the smaller the distance between the movable core iron and the static core iron is, the larger the magnetic force between the movable core iron and the static core iron is. Therefore, the magnetic force of the movable core iron at the matching position is greater than that of the movable core iron at the initial position. In the traditional technical scheme, the valve core always moves synchronously with the movable core iron, so that when the valve is opened, the movable core iron needs to overcome the pressure difference force of the valve core at the initial position, but when the valve is at the initial position, the electromagnetic force between the movable core iron and the static core iron is small, and therefore the valve opening difficulty in the traditional technical scheme is large. Compared with the traditional technical scheme, the arrangement of the scheme can increase the electromagnetic force for driving the valve plug to move at any time, and the smoothness of valve opening is improved.

Further, the distance between the initial position and the matching position is H1, the distance between the initial position and the adsorption position is H, and H is more than or equal to 2% and less than or equal to H-H1 and less than or equal to 20% H. So set up, can further ensure the smooth and easy nature that the movable core iron band moving valve core synchronous motion, and then can guarantee the smooth and easy nature of opening the valve.

Further, the case has the through-hole, and the second end of moving the core iron is movably worn to establish in the through-hole, is provided with limit structure between case and the moving core iron, and limit structure is used for the relative displacement volume between limit brake core iron and the case. And the limiting structure is arranged, so that the movable core iron can be driven to synchronously move when moving to the matching position.

Further, the through hole includes first through hole and the second through hole of the orientation ladder setting along quiet core iron to the valve port, the diameter of second through hole is greater than the diameter of first through hole, form the ladder face between first through hole and the second through hole, the second end of moving core iron has spacing portion, spacing portion and the spacing cooperation of ladder face, when moving core iron is in initial position, the interval has between spacing portion and the ladder face, when moving core iron is in the cooperation position, spacing portion and ladder face butt, move core iron through spacing portion and the cooperation of ladder face in order to drive the case and remove. The above arrangement has simple structure, and is convenient for processing and forming the movable core iron and the valve core.

Furthermore, a balance channel is arranged on the movable core iron, one end of the balance channel penetrates through the end face of the first end, and the other end of the balance channel penetrates through the end face of the second end and is communicated with the through hole. The setting of balanced passageway can be so that hold intracavity portion and realize the internal balance fast, guarantees the smooth and easy nature of opening the valve and closing the valve.

Furthermore, a balance hole is formed in the side wall of the movable core iron and is close to the first end of the movable core iron, and the balance hole is communicated with the balance channel. So set up, can further promote and hold the speed that the intracavity portion realized the internal balance, further promote the smooth and easy nature of opening the valve and closing the valve.

Further, the solenoid valve further includes: and the buffer piece is arranged between the second end of the movable core iron and the valve core, one end of the buffer piece is connected with the valve core, and the other end of the buffer piece is connected with the second end of the movable core iron. The setting of bolster can play the effect of buffering when moving core iron and case contact, will move the rigid contact between core iron and the case and become the flexible contact, guarantees the structural strength of case and moving core iron.

Further, the valve core comprises a first section, a second section and a third section which are sequentially connected from the valve port to the static core iron, wherein the outer diameter of the first section and the outer diameter of the third section are both larger than that of the second section, a circulation hole is further formed in the valve body and communicated with the accommodating cavity, and when the valve core is located at the position for closing the valve port, the circulation hole and the second section are oppositely arranged. So set up, can reduce the impact force of fluid to the case, and then can guarantee the life-span of case.

Furthermore, the solenoid valve still includes first sealing member and second sealing member, and the periphery at first section is established to first sealing member cover and with the inner wall sealing connection of valve body, and the periphery at the third section is established to the second sealing member cover and with the inner wall sealing connection of valve body. The setting of first sealing member and second sealing member can guarantee the sealed effect to holding the chamber, and then can guarantee the stability of closing the valve.

Further, the movable core iron comprises a magnetic force part and a matching part which are connected with each other along the direction from the static core iron to the valve port, the sectional area of the matching part is smaller than that of the magnetic force part, the matching part is in sliding fit with the valve core, the valve core comprises a protruding part and a body part which are connected with each other along the direction from the static core iron to the valve port, the sectional area of the protruding part is smaller than that of the body part, and the sectional area of the protruding part is smaller than that of the magnetic force part. So set up, can reduce the adsorption affinity between bulge and the magnetic force portion, promote the smooth and easy nature of valve opening process.

Furthermore, the solenoid valve still includes the piece that resets, and the piece that resets sets up between quiet core iron and moving core iron, and the piece that resets is used for driving moving core iron and restores to the initial position by the adsorption position.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, 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 is a cross-sectional view of a moving core of a solenoid valve according to an embodiment of the present invention in an initial position;

fig. 2 is a schematic diagram illustrating a position structure of a moving core of a solenoid valve according to an embodiment of the present invention when the moving core is in a fitting position;

fig. 3 shows a schematic structural diagram of a magnetic force portion of a moving core iron of a solenoid valve and a valve core when the magnetic force portion and the valve core are attached to each other.

Wherein the figures include the following reference numerals:

10. a valve body; 101. an accommodating chamber; 102. a valve port; 103. a flow-through hole; 11. a valve seat; 111. a first chamber; 12. a sleeve; 121. a second chamber; 13. a coil;

20. static core iron;

30. moving core iron;

301. a limiting part; 302. a balancing channel; 303. a balance hole;

31. a magnetic part; 32. a fitting portion;

40. a valve core; 401. a first through hole; 402. a second through hole; 403. a first seal member; 404. a second seal member; 41. a first stage; 42. a second stage; 43. a third stage; 44. a projection;

50. a buffer member;

60. a reset member.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all 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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

As shown in fig. 1 to 3, the present invention provides a solenoid valve, which includes a valve body 10, a stationary core iron 20, a movable core iron 30, and a valve core 40. The valve body 10 has an accommodating chamber 101 and a valve port 102, and the valve port 102 is disposed at one end of the valve body 10 and communicates with the accommodating chamber 101. The static core iron 20 is disposed in the accommodating chamber 101 and is disposed opposite to the valve port 102. The moving core iron 30 is movably disposed in the accommodating cavity 101, and the moving core iron 30 has a first end and a second end opposite to each other, the first end is magnetically coupled to the stationary core iron 20, and the second end is disposed toward the valve port 102. The valve core 40 is located in the accommodating cavity 101, and the valve core 40 is movably arranged at the second end of the movable core iron 30, the valve core 40 is used for opening or closing the valve port 102, and when the movable core iron 30 moves towards the stationary core iron 20, the valve core 40 has a static state and a moving state which moves synchronously with the movable core iron 30. The movable core iron 30 has an initial position, a matching position and an adsorption position arranged along the direction from the valve port 102 to the stationary core iron 20, when the movable core iron 30 is at the initial position, the valve core 40 is in a static state, and when the movable core iron 30 moves to the matching position, the valve core 40 and the movable core iron 30 synchronously move until the movable core iron 30 moves to the adsorption position.

Use the technical scheme of the utility model, when opening the valve, moving core iron 30 and removing to the in-process of cooperation position by initial position, case 40 keeps static, and moves the pressure differential that core iron 30 need not overcome case 40 and receive this moment, when moving core iron 30 and driving case 40 synchronous motion, just need overcome case 40's pressure differential. Specifically, when the valve is opened, the movable core 30 moves toward the direction close to the stationary core 20 under the action of the electromagnetic force, and after the movable core 30 moves to the engaging position, the movable core 30 drives the valve core 40 to move toward the direction close to the stationary core 20 synchronously until the movable core 30 moves to the adsorbing position, and the valve core 40 completely opens the valve port 102. Since the electromagnetic force between the moving core iron 30 and the stationary core iron 20 and the distance therebetween are exponentially changed, the smaller the distance between the moving core iron 30 and the stationary core iron 20 is, the larger the magnetic force therebetween is. Therefore, the magnetic force of the moving core 30 at the engagement position is greater than the magnetic force of the moving core 30 at the initial position. In the conventional technical solution, the valve core 40 always moves synchronously with the moving core 30, so that when the valve is opened, the moving core 30 needs to overcome the pressure difference force of the valve core 40 at the initial position, but when the valve is opened at the initial position, the electromagnetic force between the moving core 30 and the stationary core 20 is small, and therefore, the valve is difficult to open in the conventional technical solution. Compared with the traditional technical scheme, the arrangement of the scheme can increase the electromagnetic force of the driving valve core 40 at the moment of moving, and the smoothness of valve opening is improved. In addition, the valve core 40 directly controls the opening and closing of the valve port 102, and the structure is simple.

As shown in FIG. 1 and FIG. 2, the distance between the initial position and the mating position is H1, the distance between the initial position and the adsorption position is H, and 2% H is less than or equal to H-H1 is less than or equal to 20% H. When the moving core iron 30 and the valve core 40 are machined, machining errors exist, assembly errors exist when the moving core iron 30 and the valve core 40 are assembled, and when H-H1 is less than or equal to 2% H, the situation that H1 is larger than H in actual working conditions possibly exists, and further the situation that the valve cannot be opened possibly occurs. When H-H1 is greater than or equal to 20% H, the clearance between the movable core iron 30 and the static core iron 20 is too large after the movable core iron 30 moves to the matching position, which may affect the valve opening effect. Therefore, in the present invention, the smoothness of the valve opening process can be further improved by setting H-H1 within the above range. Optionally, H-H1-2% H, H-H1-5% H, H-H1-6% H, H-H1-8% H, H-H1-10% H, H-H1-15% H or H-H1-20% H, in this case, H-H1-5% H.

As shown in fig. 1 and 3, the valve core 40 has a through hole, the second end of the movable core 30 movably penetrates through the through hole, and a limiting structure is disposed between the valve core 40 and the movable core 30 and used for limiting the relative displacement between the movable core 30 and the valve core 40. Specifically, when the valve is opened, under the action of electromagnetic force, the movable core iron 30 moves towards the direction close to the stationary core iron 20 until the movable core iron 30 moves to the matching position, and at this time, the limiting structure acts between the movable core iron 30 and the valve core 40, so that the valve core 40 moves synchronously with the movable core iron 30. The structure is simple. And the second end of the movable core iron 30 is arranged in the through hole in a penetrating way, when the valve core 40 is in a state of closing the valve port, the height of the whole movable core iron 30 and the valve core 40 can be reduced as much as possible, and then the compactness of the electromagnetic valve can be ensured, so that the electromagnetic valve is miniaturized.

As shown in fig. 2 and 3, the through holes include a first through hole 401 and a second through hole 402 which are arranged in a stepped manner along the direction from the static core iron 20 to the valve port 102, the diameter of the second through hole 402 is greater than that of the first through hole 401, a stepped surface is formed between the first through hole 401 and the second through hole 402, the second end of the movable core iron 30 is provided with a limiting portion 301, the limiting portion 301 is in limiting fit with the stepped surface, when the movable core iron 30 is at an initial position, a gap is formed between the limiting portion 301 and the stepped surface, when the movable core iron 30 is at a fit position, the limiting portion 301 is abutted against the stepped surface, and the movable core iron 30 is matched with the stepped surface through the limiting portion 301 to drive the valve core 40 to move. In this scheme, spacing portion 301 forms limit structure with the ladder face. Specifically, when the valve is opened, the movable core iron 30 moves towards the direction close to the static core iron 20, the valve core 40 is in a static state when the movable core iron 30 moves from the initial position to the matching position, the limiting portion 301 is abutted to the stepped surface when the movable core iron 30 moves to the matching position, the movable core iron 30 continues to move towards the direction close to the static core iron 20, the electromagnetic force applied to the movable core iron 30 is enough to overcome the gravity of the movable core iron 30, the gravity of the valve core 40 and the differential pressure force applied to the valve core 40, and at the moment, the movable core iron 30 drives the valve core 40 to move towards the direction close to the static core iron 20 until the movable core iron 30 moves to the adsorption position. Specifically, the distance between the end face of the limiting portion 301 close to one end of the stepped surface and the stepped surface is equal to the distance between the initial position and the matching position of the moving core iron 30. So set up, can reflect the interval between initial position to the cooperation position through spacing portion 301's the terminal surface that is close to the one end of ladder face and the ladder face, when the interval between initial position to the cooperation position needs to be adjusted, through spacing portion 301 be close to the terminal surface of the one end of ladder face and the interval between the ladder face can, and then can guarantee the adaptability of scheme.

As shown in fig. 3, a balance channel 302 is disposed on the moving core 30, one end of the balance channel 302 is disposed through the end surface of the first end, and the other end of the balance channel 302 is disposed through the end surface of the second end and is communicated with the through hole. The setting of balanced passageway 302 can be so that hold chamber 101 and mounting hole and realize interior balance fast, reduces the resistance that valve core 40 removed the in-process and received, promotes the smooth and easy nature of valve core 40 removal process. In this embodiment, the extending direction of the balance passage 302 is the same as the extending direction of the moving core 30. So set up, can guarantee the balanced effect of balanced passageway 302 to atmospheric pressure.

Further, a balance hole 303 is formed in the side wall of the moving core 30, the balance hole 303 is disposed near the first end of the moving core 30, and the balance hole 303 is communicated with the balance channel 302. The setting of balancing hole 303 can further play the effect of balanced atmospheric pressure, and then can further promote the balanced effect of atmospheric pressure that holds in chamber and the mounting hole, guarantees the smooth and easy nature that case 40 removed. The number of the balance holes 303 is not limited in the present embodiment, in this embodiment, there is one balance hole 303, and the extending direction of the balance hole 303 is perpendicular to the extending direction of the moving core 30.

As shown in fig. 1 and 3, the solenoid valve further includes a buffer 50. The buffer member 50 is disposed between the second end of the moving core 30 and the valve core 40, one end of the buffer member 50 is connected to the valve core 40, and the other end of the buffer member 50 is connected to the second end of the moving core 30. In this embodiment, the buffering member 50 is a buffering spring, the buffering spring is sleeved at the second end of the movable core 30, one end of the buffering spring is connected to the movable core 30, and the other end of the buffering spring is connected to the step surface. Buffer spring's setting, can play the effect of buffering when spacing portion 301 contacts with the ladder face, reduce spacing portion 301 and the effort of the spacing portion 301 effect on case 40 in the twinkling of an eye of ladder face contact, guarantee to move the stationarity that core iron 30 drove case 40 moving process, simultaneously, also can reduce the terminal surface that is close to the one end of ladder face of spacing portion 301 and the ladder face and receive the too big condition that takes place to warp of impact force, after guaranteeing to pass through long-time use, interval between initial position and the cooperation position is unanimous as far as possible with the interval between the two when dispatching from the factory, guarantee the smooth and easy nature of opening the valve.

As shown in fig. 3, the valve core 40 includes a first section 41, a second section 42, and a third section 43 sequentially connected from the valve port 102 to the stationary core 20, wherein the outer diameters of the first section 41 and the third section 43 are both larger than the outer diameter of the second section 42, the valve body 10 is further provided with a flow hole 103, the flow hole 103 is communicated with the accommodating cavity 101, and when the valve core 40 is at a position for closing the valve port 102, the flow hole 103 is opposite to the second section 42. By the arrangement, the whole weight of the valve core 40 can be reduced, and further the gravity of the valve core 40 which needs to be overcome when the movable core iron 30 drives the valve core 40 to move can be reduced, and the smoothness of valve opening is further improved. When the valve body 40 is in a position to close the valve port 102, the flow hole 103 is provided to face the second land 42. Because the outer diameter of the second section 42 is smaller than the outer diameter of the third section 43 and the outer diameter of the second section 42 is also smaller than the outer diameter of the first section 41, the contact area between the valve core 40 and the fluid can be reduced, the impact force of the fluid on the valve core 40 can be reduced, and the stability of the valve core 40 can be ensured. In addition, with such an arrangement, the space between the valve core 40 and the inner wall of the valve body 10 can be increased, so that the flow rate of the fluid can be ensured, and the smoothness of the fluid circulation can be improved. In addition, the first section 41 and the third section 43 are in clearance fit with the accommodating cavity 101, and the second section 42 is spaced from the inner wall of the valve body 10 by a large distance, so that the friction force between the second section 42 and the inner wall of the valve body 10 does not need to be overcome in the process of opening and closing the valve, and the smoothness of the process of opening and closing the valve is improved.

As shown in fig. 1, the solenoid valve further includes a first sealing member 403 and a second sealing member 404, the first sealing member is disposed on the outer periphery of the first section 41 and is in sealing connection with the inner wall of the valve body 10, and the second sealing member 404 is disposed on the outer periphery of the third section 43 and is in sealing connection with the inner wall of the valve body 10. Specifically, the valve body 10 includes a valve seat 11 and a sleeve 12, and the solenoid valve further includes a coil 13. Wherein, the valve seat 11 has a first chamber 111, and the valve port 102 is disposed at one end of the valve seat 11 and is communicated with the first chamber 111. The sleeve 12 has a second chamber 121, one end of the sleeve 12 is inserted into the valve seat 11, the sleeve 12 is disposed opposite to the valve port 102, and the second chamber 121 is communicated with the first chamber 111 and forms a receiving cavity. The second chamber 121 is coaxially disposed with the first chamber 111, and the cross-section of the second chamber 121 is smaller than that of the first chamber 111. The static core iron 20 is disposed at an end of the sleeve 12 distal from the valve port 102. The coil 13 is sleeved on the periphery of the sleeve 12 and is in magnetic force fit with the static core iron 20. The valve core 40 is movably disposed in the first chamber 111, and when the moving core 30 is in the initial position, the second end of the moving core 30 is located in the first chamber 111 and is in abutting engagement with the valve core 40. The provision of the first seal 403 and the second seal 404 can increase the sealing effect for sealing the first chamber 111, and further can ensure the stability of the valve closing. Specifically, a first mounting groove is annularly formed on the circumferential surface of the first section 41, and the first sealing member 403 is embedded in the first mounting groove. A second mounting groove is annularly formed on the circumferential surface of the third section 43, and the second sealing element 404 is embedded in the second mounting groove. So set up, can guarantee the convenience of first sealing member and second sealing member installation to can guarantee the stability of first sealing member 403 and the installation of second sealing member 404, and then can guarantee the stability of opening the valve and closing the valve process.

As shown in fig. 3, the moving core 30 includes a magnetic portion 31 and an engaging portion 32 connected to each other in a direction from the stationary core 20 to the valve port 102, a sectional area of the engaging portion 32 is smaller than a sectional area of the magnetic portion 31, the engaging portion 32 is slidably engaged with the valve core 40, the valve core 40 includes a protrusion 44 and a body portion connected to each other in the direction from the stationary core 20 to the valve port 102, a sectional area of the protrusion 44 is smaller than a sectional area of the body portion, and a sectional area of the protrusion 44 is smaller than a sectional area of the magnetic portion 31. Specifically, the first section 41, the second section 42, and the third section 43 form a body portion. And when the movable core 30 is at the initial position, one end of the magnetic part 31 far away from the connection of the matching part 32 is inserted into the second chamber 121, and the other end of the magnetic part 31 is inserted into the first chamber 111 and is in abutting fit with the protruding part 44 of the valve core 40. In the actual use process, lubricating oil is arranged between the protruding portion 44 and the magnetic portion 31, and under the action of the lubricating oil, a certain adsorption force is arranged between the protruding portion 44 and the magnetic portion 31. In addition, the protrusion 44 can guide and limit the movement of the engagement portion 32, thereby ensuring the stability of the movement of the engagement portion 32, and further ensuring the stability of the valve opening and closing processes.

Further, the fitting portion 32 includes fourth, fifth, sixth, and seventh sections that are stepped in the axial direction, and the diameters of the fourth, fifth, sixth, and seventh sections gradually increase. Wherein, the terminal surface that is close to the one end of case 40 of magnetic force portion 31 is provided with the pilot hole, the one end of keeping away from the fifth section of fourth section wear to establish in the pilot hole and with pilot hole interference fit, the sixth section forms spacing portion, buffer spring's a pot head establish in the periphery of sixth section and with seventh section butt, buffer spring's the other end and the inner peripheral surface butt of case 40. So set up, can guarantee the convenience to the buffer spring assembly to, can reduce the weight of cooperation portion 32 as far as possible, reduce the gravity of the cooperation portion 32 that need overcome among the valve opening process, promote the smooth and easy nature of valve opening process.

As shown in fig. 1, the solenoid valve further includes a reset element 60, the reset element 60 is disposed between the stationary core element 20 and the movable core element 30, and the reset element 60 is configured to drive the movable core element 30 to return from the adsorption position to the initial position. Further, the balance passage 302 includes a first passage, a second passage, a third passage, and a fourth passage that are sequentially communicated in a direction from the magnetic force part 31 to the mating part. The first, second and third channels are all provided on the magnetic part 31, and the fourth channel is provided on the mating part 32. The diameter of the first channel is larger than that of the second channel, the assembling hole forms a third channel, and the diameter of the third channel is larger than that of the second channel. The diameter of the fourth channel is the same as the diameter of the second channel and the fourth channel is disposed through the mating portion 32. With this arrangement, the compactness of the entire structure of the movable core iron 30 can be ensured. Reset 60 is reset spring, and reset spring's one end sets up in first passageway, and reset spring's the other end protrusion first passageway and with quiet core iron 20 butt cooperation. The setting of reset spring, its simple structure is convenient for assemble with magnetic force portion 31 to, set up reset spring's one end in first passageway, can guarantee reset spring's stability.

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.

Unless specifically stated 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. 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 should be understood that the directions or positional relationships indicated by the directional terms such as "front, back, upper, lower, left, right", "horizontal, vertical, horizontal" and "top, bottom", etc. are usually based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, and in the case of not making a contrary explanation, these directional terms do not indicate and imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore, should not be construed 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 … …," "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 do not have 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 (11)

1. A solenoid valve, comprising:

the valve comprises a valve body (10) and a valve opening (102), wherein the valve opening (102) is arranged at one end of the valve body (10) and is communicated with the accommodating cavity (101);

the static core iron (20) is arranged in the accommodating cavity (101) and is opposite to the valve port (102);

the movable core iron (30) is movably arranged in the accommodating cavity (101), and the movable core iron (30) is provided with a first end and a second end which are oppositely arranged, the first end is in magnetic force fit with the static core iron (20), and the second end is arranged towards the valve port (102);

the valve core (40) is positioned in the accommodating cavity (101), the valve core (40) is movably arranged at the second end of the movable core iron (30), the valve core (40) is used for opening or closing the valve port (102), and when the movable core iron (30) moves towards the static core iron (20), the valve core (40) has a static state and a motion state synchronously moving along with the movable core iron (30);

the movable core iron (30) is provided with an initial position, a matching position and an adsorption position which are arranged along the direction from the valve port (102) to the static core iron (20), when the movable core iron (30) is at the initial position, the valve core (40) is in the static state, and after the movable core iron (30) moves to the matching position, the valve core (40) and the movable core iron (30) move synchronously until the movable core iron (30) moves to the adsorption position.

2. The solenoid valve of claim 1 wherein the spacing between the home position to the engaged position is H1, the spacing between the home position to the adsorption position is H, 2% H ≦ H-H1 ≦ 20% H.

3. The electromagnetic valve according to claim 1, wherein the valve core (40) has a through hole, the second end of the movable core iron (30) is movably inserted into the through hole, and a limiting structure is arranged between the valve core (40) and the movable core iron (30) and used for limiting the relative displacement between the movable core iron (30) and the valve core (40).

4. The solenoid valve according to claim 3, wherein the through holes comprise a first through hole (401) and a second through hole (402) which are arranged in a stepped manner in a direction from the stationary core iron (20) to the valve port (102), the diameter of the second through hole (402) is larger than that of the first through hole (401), a step surface is formed between the first through hole (401) and the second through hole (402), the second end of the movable core iron (30) is provided with a limiting part (301), the limiting part (301) is in limiting fit with the stepped surface, when the movable core iron (30) is at the initial position, a gap is formed between the limiting part (301) and the stepped surface, when the movable core iron (30) is at the matching position, the limiting part (301) is abutted with the stepped surface, the movable core iron (30) is matched with the stepped surface through the limiting part (301) to drive the valve core (40) to move.

5. The electromagnetic valve according to claim 3, wherein the movable core iron (30) is provided with a balance channel (302), one end of the balance channel (302) is arranged to penetrate through the end face of the first end, and the other end of the balance channel (302) is arranged to penetrate through the end face of the second end and is communicated with the through hole.

6. The electromagnetic valve according to claim 5, characterized in that the side wall of the moving core iron (30) is provided with a balancing hole (303), the balancing hole (303) is arranged near the first end of the moving core iron (30), and the balancing hole (303) is communicated with the balancing channel (302).

7. The solenoid valve of claim 1, further comprising:

the buffer piece (50) is arranged between the second end of the movable core iron (30) and the valve core (40), one end of the buffer piece (50) is connected with the valve core (40), and the other end of the buffer piece (50) is connected with the second end of the movable core iron (30).

8. The electromagnetic valve according to claim 1, characterized in that the valve core (40) comprises a first section (41), a second section (42) and a third section (43) which are connected in sequence from the valve port (102) to the static core iron (20), wherein the outer diameters of the first section (41) and the third section (43) are both larger than the outer diameter of the second section (42), the valve body (10) is further provided with a flow hole (103), the flow hole (103) is communicated with the accommodating cavity (101), and when the valve core (40) is in a position for closing the valve port (102), the flow hole (103) is opposite to the second section (42).

9. The solenoid valve according to claim 8, characterized in that it further comprises a first sealing member (403) and a second sealing member (404), said first sealing member (403) is arranged around the periphery of said first section (41) and is in sealing connection with the inner wall of said valve body (10), said second sealing member (404) is arranged around the periphery of said third section (43) and is in sealing connection with the inner wall of said valve body (10).

10. The electromagnetic valve according to claim 3, wherein the moving core iron (30) comprises a magnetic portion (31) and an engaging portion (32) connected to each other in a direction from the stationary core iron (20) to the valve port (102), a cross-sectional area of the engaging portion (32) is smaller than a cross-sectional area of the magnetic portion (31), the engaging portion (32) is slidably engaged with the valve body (40), the valve body (40) comprises a protruding portion (44) and a body portion connected to each other in the direction from the stationary core iron (20) to the valve port (102), a cross-sectional area of the protruding portion (44) is smaller than a cross-sectional area of the body portion, and a cross-sectional area of the protruding portion (44) is smaller than a cross-sectional area of the magnetic portion (31).

11. The solenoid valve according to claim 1, characterized in that it further comprises a resetting member (60), said resetting member (60) being arranged between said static core iron (20) and said moving core iron (30), said resetting member (60) being adapted to drive said moving core iron (30) from said attracted position back to said initial position.

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