CN116838840A

CN116838840A - Electromagnetic stop valve

Info

Publication number: CN116838840A
Application number: CN202210302018.1A
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Dunan Automotive Thermal Management Technology Co Ltd
Current assignee: Dunan Automotive Thermal Management Technology Co Ltd
Priority date: 2022-03-25
Filing date: 2022-03-25
Publication date: 2023-10-03

Abstract

The application provides an electromagnetic stop valve, which comprises: the valve body is provided with a containing cavity, one end of the containing cavity is provided with a valve port, and the valve port is communicated with the containing cavity; the driving assembly is at least partially arranged in the accommodating cavity, and is positioned at one end of the accommodating cavity far away from the valve port; the valve core is movably arranged in the accommodating cavity, the valve core is provided with a first section and a second section which are arranged in a stepped mode, the first section of the valve core is connected with the driving assembly in a penetrating mode, the second section of the valve core corresponds to the valve port, the valve port is opened or closed through the second section of the valve core, the valve core is further provided with a balance channel and a balance hole which are mutually communicated, the balance channel axially penetrates through the valve core, the balance hole is formed in the first section of the valve core, and one end of the balance hole is located on the side wall of the valve core. By the technical scheme, the problem of unbalanced pressure at two ends of the valve core of the electromagnetic stop valve in the prior art can be solved.

Description

Electromagnetic stop valve

Technical Field

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

Background

At present, the existing electromagnetic stop valve comprises a valve body, a valve core and a driving piece, wherein the valve body is provided with a containing cavity and a valve port, the valve core is arranged in the containing cavity, one end of the valve core is fixedly connected with a movable iron core, the driving piece is fixedly connected with the valve core and can drive the valve core to open or block the valve port, when the device operates, as pressure is generated on one end of the valve core when a medium flows in the valve port, the pressure difference phenomenon can occur at two ends of the valve core, so that the movement of the valve core can be limited, the valve core can not normally open or block the valve port, and therefore the stability of the device during operation can not be guaranteed, and the normal operation of the device is influenced.

Disclosure of Invention

The application provides an electromagnetic stop valve, which aims to solve the problem of unbalanced pressure at two ends of a valve core of the electromagnetic stop valve in the prior art.

The application provides an electromagnetic stop valve, which comprises: the valve body is provided with a containing cavity, one end of the containing cavity is provided with a valve port, and the valve port is communicated with the containing cavity; the driving assembly is at least partially arranged in the accommodating cavity, and is positioned at one end of the accommodating cavity far away from the valve port; the valve core is movably arranged in the accommodating cavity, the valve core is provided with a first section and a second section which are arranged in a stepped mode, the first section of the valve core is connected with the driving assembly in a penetrating mode, the second section of the valve core corresponds to the valve port, the valve port is opened or closed through the second section of the valve core, the valve core is further provided with a balance channel and a balance hole which are mutually communicated, the balance channel axially penetrates through the valve core, the balance hole is formed in the first section of the valve core, and one end of the balance hole is located on the side wall of the valve core.

By adopting the technical scheme of the application, the balance channel and the balance hole which are mutually communicated are arranged on the valve core, the balance channel axially penetrates through the valve core, one end of the balance hole is arranged on the side wall of the valve core, when the device operates, the balance channel can be communicated with the valve port, the pressure at the two ends of the valve core can be kept consistent by arranging the balance channel and communicating with the valve port, meanwhile, the first section of the valve core is connected with the drive assembly in a penetrating way, and the space between the drive assembly and the valve core is communicated with the valve port through the balance hole, so that the pressure at the two ends of the drive assembly and the valve core can be kept consistent.

Further, the drive assembly includes: the fixed iron core is provided with a first end and a second end which are oppositely arranged, and the first end of the fixed iron core is fixed at one end of the valve body far away from the valve port; the sleeve is sleeved at the second end of the fixed iron core; the movable iron core is movably arranged in the sleeve and is positioned at one end of the fixed iron core far away from the valve port, the first section of the valve core penetrates through the fixed iron core and is connected with the movable iron core, and the fixed iron core is matched with the movable iron core to drive the valve core to move in the accommodating cavity. Through setting up above-mentioned structure, will decide the iron core and move iron core and sleeve pipe connection, when the device operation, decide the iron core and advance actuation or separation with moving the iron core to make the valve core shutoff or open the valve port, above-mentioned driving mode is reasonable and simple structure, also the dismouting of the device of being convenient for when satisfying the normal drive of device, thereby can improve the dismouting efficiency of device.

Further, the fixed iron core is provided with a first hole section, a second hole section and a third hole section in sequence along the axial direction, the first hole section penetrates out of the first end of the fixed iron core, the second hole Duan You penetrates out of the second end of the fixed iron core, and the balance hole is located in the space between the first hole section and the movable iron core and/or in the space between the third hole section and the valve core. So set up, when the device operates, in medium accessible balance hole flows through first hole section and/or third hole section to make the pressure of first hole section and/or third hole section equal with the pressure of valve port department, can realize deciding the inside pressure balance with valve port department of iron core, and then can guarantee the normal operating of case, also further improved the stability when the device operates simultaneously.

Further, the balance hole comprises a first through hole and a second through hole, the first through hole and the second through hole are axially arranged on the first section of the valve core at intervals, the first through hole and the second through hole extend along the radial direction of the valve core, when the valve core is positioned at the position of opening the valve port, the first through hole is positioned in the first hole section, and the second through hole is positioned in the third hole section. So set up, set up the quantity of balance hole into two, when the device is operated, first hole section and third hole section and the pressure maintenance of case are unanimous respectively to first through-hole and second through-hole to guaranteed as far as each junction's of valve body inside pressure equality, so not only rationally utilized the space of case, also can satisfy the balance of device inside pressure simultaneously, guaranteed the normal operating of device.

Further, the diameters of the first hole section and the third hole section are larger than the diameter of the second hole section, and the second hole section is matched with the first section of the valve core so as to guide the first section of the valve core. Through setting up above-mentioned structure, set up first hole section and second hole section into echelonment, be favorable to satisfying the installation demand of device, the second hole section can use with the case cooperation simultaneously, so can decide the iron core can not produce the interference to the case when the device operates to can guarantee the stability when the case operates.

Further, the electromagnetic stop valve further comprises an elastic piece, the elastic piece is arranged between the fixed iron core and the movable iron core, one end of the elastic piece is connected with the fixed iron core, and the other end of the elastic piece is connected with the movable iron core and is located in the first hole section. When the valve is in operation, the elastic force of the elastic piece can act on the movable iron core to enable the movable iron core to be positioned at the position of opening the valve port, so that the valve opening function of the valve body can be realized.

Further, the electromagnetic stop valve further comprises a first sealing element, the first sealing element is arranged on the periphery of the second section of the valve core, which is close to the valve port, and the first sealing element can be matched with the inner wall of the valve body to seal the valve port. Through setting up above-mentioned structure, first sealing member can carry out the shutoff to the valve port to realize the radial seal of the junction of the second end of case and valve port, so can reduce the interior hourglass of device effectively, thereby improved the sealed effect of device.

Further, the valve body is provided with a flow hole, the flow hole is formed in the side wall of the valve body and is communicated with the accommodating cavity, the electromagnetic stop valve further comprises a second sealing piece, the second sealing piece is arranged on the outer side wall of the second section of the valve core, the second sealing piece can be matched and sealed with the side wall of the accommodating cavity, and when the valve core is in a position for closing the valve port, the flow hole is located between the first sealing piece and the second sealing piece. The second sealing member is used for sealing the junction of holding chamber and case to avoid the medium to take place to reveal in this department, through setting up above-mentioned structure, can further improve the sealed effect of device.

Further, the balance channel is provided with a first circulation channel and a second circulation channel which are sequentially arranged along the axial direction in a stepped manner, the first circulation channel is positioned in the first section of the valve core, the second circulation channel is positioned in the second section of the valve core, and the inner diameter of the first circulation channel is smaller than the inner diameter of the second circulation channel. The device has the advantages that the large-caliber inner balance function of the device can be realized, meanwhile, the inner diameter size of the second flow channel can be adjusted according to the valve port flow demand, so that the applicability of the device can be improved, and the application range of the device is widened.

Further, the valve body includes body and disk seat, and the body has the mounting hole, and the disk seat is connected with the body, and is located the mounting hole, and the disk seat has the valve port, and first sealing member sets up between case and mounting hole. The device is easier to disassemble and assemble, the disassembling difficulty of the device is reduced, and the valve seat is arranged in the mounting hole, so that the whole size of the device is reduced, and the device can be miniaturized.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

fig. 1 shows a schematic structural diagram of an electromagnetic stop valve according to an embodiment of the present application.

Wherein the above figures include the following reference numerals:

10. a valve body; 11. a receiving chamber; 12. a valve port; 13. a flow hole; 14. a body; 15. a valve seat;

20. a valve core; 21. a first section; 22. a second section; 23. a first through hole; 24. a second through hole; 25. a first flow channel; 26. a second flow channel;

30. fixing an iron core; 31. a first bore section; 32. a second bore section; 33. a third bore section;

40. a sleeve; 50. a movable iron core; 60. an elastic member; 70. a first seal; 80. a second seal; 90. a coil.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

As shown in fig. 1, the present application provides an electromagnetic shut-off valve including a valve body 10, a driving assembly, and a valve core 20. The driving assembly is provided with a containing cavity 11, one end of the containing cavity 11 is provided with a valve port 12, the valve port 12 is communicated with the containing cavity 11, the driving assembly is at least partially arranged in the containing cavity 11, the driving assembly is located at one end of the containing cavity 11 far away from the valve port 12, the valve core 20 is movably arranged in the containing cavity 11, the valve core 20 is provided with a first section 21 and a second section 22 which are arranged in a stepped mode, the first section 21 of the valve core 20 is connected with the driving assembly in a penetrating mode, the second section 22 of the valve core 20 corresponds to the valve port 12, so that the valve port 12 is opened or closed through the second section 22 of the valve core 20, the valve core 20 is further provided with a balance channel and a balance hole which are communicated with each other, the balance channel axially penetrates through the valve core 20, the balance hole is formed in the first section 21 of the valve core 20, and one end of the balance hole is located on the side wall of the valve core 20. In the embodiment of the present application, the balance hole is radially disposed on the valve core 20, and of course, the balance hole may also be disposed at other angles with the first section 21 of the valve core 20, specifically may be disposed according to the actual use requirement of the device, so as to improve the applicability of the device.

By applying the technical scheme of the application, the valve core 20 is provided with the balance channel and the balance hole which are mutually communicated, the balance channel axially penetrates through the valve core 20, one end of the balance hole is arranged on the side wall of the valve core 20, when the device operates, the balance channel can be communicated with the valve port 12, the pressure at the two ends of the valve core 20 can be kept consistent by arranging the balance channel and communicating with the valve port 12, meanwhile, the first section 21 of the valve core 20 is connected with the driving assembly in a penetrating way, so that the space between the driving assembly and the valve core 20 is communicated with the valve port 12 through the balance hole, the pressure at the two ends of the driving assembly and the valve core 20 can be kept consistent, the pressure at the two ends of the valve core 20 can be kept consistent by arranging the structure, and the problem that the valve opening or the valve closing is inconvenient due to the pressure difference at the two ends of the valve core 20 can be effectively avoided, and the stability of the device during operation can be improved, and the normal operation of the device can be ensured.

Further, the driving assembly includes a stationary core 30, a sleeve 40, and a movable core 50. The fixed iron core 30 has a first end and a second end which are oppositely arranged, the first end of the fixed iron core 30 is fixed at one end of the valve body 10 far away from the valve port 12, the sleeve 40 is sleeved at the second end of the fixed iron core 30, the movable iron core 50 is movably arranged in the sleeve 40 and is positioned at one end of the fixed iron core 30 far away from the valve port 12, the first section 21 of the valve core 20 penetrates through the fixed iron core 30 and is connected with the movable iron core 50, and the fixed iron core 30 is matched with the movable iron core 50 to drive the valve core 20 to move in the accommodating cavity 11. Through setting up above-mentioned structure, with fixed iron core 30 and moving iron core 50 and sleeve pipe 40 connection, when the device is operated, fixed iron core 30 can with move iron core 50 actuation or separation to make case 20 shutoff or open valve port 12, above-mentioned driving method is reasonable and simple structure, also the dismouting of the device of being convenient for when satisfying the normal drive of device, thereby can improve the dismouting efficiency of device.

In this embodiment of the present application, the driving assembly further includes a coil 90, where the coil 90 is disposed around the outer circumference of the sleeve 40, and when the coil 90 is energized, the fixed iron core 30 generates a magnetic force, and the magnetic force can drive the movable iron core 50 to move so that the valve core 20 seals the valve port 12.

Specifically, in the embodiment of the present application, the fixed core 30 is provided with a first hole section 31, a second hole section 32 and a third hole section 33 in order in the axial direction, the first hole section 31 is penetrated out of the first end of the fixed core 30, the second hole section 32 is penetrated out of the second end of the fixed core 30, and the balance hole is located in the space between the first hole section 31 and the movable core 50 and the space between the third hole section 33 and the valve core 20. When the device is operated, the pressure of the first hole section 31 and/or the third hole section 33 can be balanced Kong Pingheng, so that the pressure of the first hole section 31 and/or the third hole section 33 is equal to the pressure at the valve port 12, the pressure balance between the inside of the fixed iron core 30 and the valve port 12 can be further realized, the normal operation of the valve core 20 is ensured, and meanwhile, the stability of the device is further improved when the device is operated.

Further, the balance hole includes a first through hole 23 and a second through hole 24, the first through hole 23 and the second through hole 24 are disposed on the first section 21 of the valve core 20 at intervals along the axial direction, the first through hole 23 and the second through hole 24 each extend along the radial direction of the valve core 20, when the valve core 20 is in the position of opening the valve port 12, the first through hole 23 is located in the first hole section 31, and the second through hole 24 is located in the third hole section 33. So set up, set up the quantity of balance hole into two, when the device is in operation, first through-hole 23 and second through-hole 24 can make the pressure of first hole section 31 and third hole section 33 and case 20 keep unanimous respectively to guarantee as far as each junction's inside valve body 10 pressure equality, so not only rationally utilized the space of case 20, also can satisfy the balance of device internal pressure simultaneously, guaranteed the normal operating of device.

Of course, in other embodiments of the present application, the number of balance holes may be multiple, so that the internal balance effect of the device can be further improved, but the processing difficulty of the valve core 20 can be improved, so that the number of balance holes can be selected according to the actual use requirement of the device.

Specifically, the diameters of the first and third bore sections 31, 33 are greater than the diameter of the second bore section 32, and the second bore section 32 is adapted to guide the first section 21 of the spool 20 with respect to the first section 21 of the spool 20. Through setting up above-mentioned structure, set up first hole section 31 and second hole section 32 into echelonment, be favorable to satisfying the installation demand of device, second hole section 32 can use with case 20 cooperation simultaneously, so can decide iron core 30 can not produce the interference to case 20 when the device operates to can guarantee the stability when case 20 operates.

Further, the electromagnetic stop valve further comprises an elastic member 60, wherein the elastic member 60 is arranged between the fixed iron core 30 and the movable iron core 50, one end of the elastic member 60 is connected with the fixed iron core 30, and the other end of the elastic member 60 is connected with the movable iron core 50 and is positioned in the first hole section 31. So configured, in operation, the spring force of the spring member 60 may act on the plunger 50 to bring the plunger 50 into a position to open the valve port 12, thereby enabling the valve opening function of the valve body 10. The elastic member 60 is specifically a return spring, so that the device is low in production cost, simple in structure and light in weight, and therefore the device is light in weight.

Specifically, the electromagnetic shut-off valve further includes a first seal 70, the first seal 70 being disposed around the outer periphery of the second section 22 of the valve core 20 proximate the valve port 12, the first seal 70 being engageable with the inner wall of the valve body 10 to seal the valve port 12. By the arrangement of the structure, the first sealing element 70 can seal the valve port 12 so as to realize radial sealing at the joint of the second end of the valve core 20 and the valve port 12, thus effectively reducing the internal leakage of the device and improving the sealing effect of the device. In this embodiment, the groove is annularly disposed on the outer periphery of the second end of the valve core 20, and the first sealing member 70 is disposed in the annular groove, so that the installation and the disassembly of the first sealing member 70 can be simplified by the above structure, and meanwhile, the above structure is convenient for processing, thereby further reducing the production cost of the device. In addition, because the valve port 12 adopts the radial sealing arrangement, the upper and lower stress areas of the valve core 20 can be better realized, and the upper and lower pressure difference of the valve core 20 is reduced, so that the pressure balance at the two ends of the valve core 20 is easier to realize, and the valve opening resistance is reduced.

Further, the valve body 10 is provided with a through hole 13, the through hole 13 is formed in a side wall of the valve body 10, the through hole 13 is in communication with the accommodating cavity 11, the electromagnetic stop valve further comprises a second sealing member 80, the second sealing member 80 is arranged on an outer side wall of the second section 22 of the valve core 20, the second sealing member 80 can be matched and sealed with the side wall of the accommodating cavity 11, and when the valve core 20 is in a position of closing the valve port 12, the through hole 13 is located between the first sealing member 70 and the second sealing member 80. The second sealing member 80 is used for sealing the connection between the accommodating chamber 11 and the valve core 20, so as to avoid leakage of the medium at the connection, and by the arrangement of the structure, the sealing effect of the device can be further improved.

Specifically, the balance channel has a first flow channel 25 and a second flow channel 26 that are arranged in a stepwise manner in the axial direction, the first flow channel 25 being located in the first section 21 of the spool 20, the second flow channel 26 being located in the second section 22 of the spool 20, the inner diameter of the first flow channel 25 being smaller than the inner diameter of the second flow channel 26. By the arrangement, the large-caliber inner balance function of the device can be realized, and meanwhile, the inner diameter size of the second flow channel 26 can be adjusted according to the flow requirement of the valve port 12, so that the applicability of the device can be improved, and the application range of the device is enlarged.

Further, the valve body 10 includes a body 14 and a valve seat 15, the body 14 has a mounting hole, the valve seat 15 is connected with the body 14 and is located in the mounting hole, the valve seat 15 has a valve port 12, and the first seal 70 is disposed between the valve core 20 and the mounting hole. The above-mentioned setting makes the dismouting of device easier, has reduced the dismouting degree of difficulty of device, sets up disk seat 15 simultaneously in the mounting hole and is favorable to reducing the whole volume of device to can realize the miniaturization of device. In the embodiment of the application, the structure of the mounting hole is in a ladder shape, the valve seat 15 is correspondingly arranged with the structure of the mounting hole, and the structure is easy to process and convenient for mounting the device, so that the production cost is reduced, the mounting efficiency of the device is further improved, and the mounting working hour of the device is shortened.

By applying the technical scheme of the application, the balance channel and the balance hole which are mutually communicated are arranged on the valve core 20, the balance channel axially penetrates through the valve core 20, one end of the balance hole is arranged on the side wall of the valve core 20, when the device operates, the balance channel can be communicated with the valve port 12, the pressure at the two ends of the valve core 20 can be kept consistent by arranging the balance channel and communicating with the valve port 12, meanwhile, as the first section 21 of the valve core 20 is connected with the driving assembly in a penetrating way, the space between the driving assembly and the valve core 20 is communicated with the valve port 12 through the balance hole, so that the pressure at the two ends of the driving assembly and the valve core 20 can be kept consistent, the pressure at the connecting positions in the valve body 10 can be ensured to be consistent by arranging the structure, the pressure at the two ends of the valve core 20 can be kept consistent by arranging the first through hole 23 and the second through hole 24, the normal operation of the device can be ensured, the pressure at the inner parts of the valve body 10 can be ensured to be kept to be different from the same, and the normal operation of the valve body can be ensured, and the internal pressure of the valve body 20 can be ensured to be kept to be different from the normal operation of the device.

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 exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present application, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative 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 in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present application.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An electromagnetic shut-off valve, characterized in that it comprises:

a valve body (10) provided with a containing cavity (11), wherein one end of the containing cavity (11) is provided with a valve port (12), and the valve port (12) is communicated with the containing cavity (11);

the driving assembly is at least partially arranged in the accommodating cavity (11), and is positioned at one end of the accommodating cavity (11) away from the valve port (12);

the valve core (20) is movably arranged in the accommodating cavity (11), the valve core (20) is provided with a first section (21) and a second section (22) which are arranged in a stepped mode, the first section (21) of the valve core (20) is connected with the driving assembly in a penetrating mode, the second section (22) of the valve core (20) corresponds to the valve port (12) and is arranged so as to open or close the valve port (12) through the second section (22) of the valve core (20), the valve core (20) is further provided with a balance channel and a balance hole which are communicated with each other, the balance channel axially penetrates through the valve core (20), the balance hole is formed in the first section (21) of the valve core (20), and one end of the balance hole is located on the side wall of the valve core (20).

2. The electromagnetic shut-off valve of claim 1, wherein the drive assembly comprises:

a fixed iron core (30) which is provided with a first end and a second end which are oppositely arranged, wherein the first end of the fixed iron core (30) is fixed at one end of the valve body (10) far away from the valve port (12);

a sleeve (40) sleeved at the second end of the fixed iron core (30);

the movable iron core (50) is movably arranged in the sleeve (40) and is positioned at one end of the fixed iron core (30) which is far away from the valve port (12), the first section (21) of the valve core (20) penetrates through the fixed iron core (30) and is connected with the movable iron core (50), and the fixed iron core (30) is matched with the movable iron core (50) to drive the valve core (20) to move in the accommodating cavity (11).

3. The electromagnetic shut-off valve according to claim 2, characterized in that the stationary core (30) is provided with a first hole section (31), a second hole section (32) and a third hole section (33) in sequence in the axial direction, the first hole section (31) being pierced out of the first end of the stationary core (30), the second hole section (32) being pierced out of the second end of the stationary core (30), the balancing hole being located in the space between the first hole section (31) and the moving core (50) and/or in the space between the third hole section (33) and the valve core (20).

4. The electromagnetic shut-off valve according to claim 3, characterized in that the balancing hole comprises a first through hole (23) and a second through hole (24), the first through hole (23) and the second through hole (24) being arranged on the first section (21) of the valve core (20) at axial intervals, the first through hole (23) and the second through hole (24) both extending in the radial direction of the valve core (20), the first through hole (23) being located in the first hole section (31) and the second through hole (24) being located in the third hole section (33) when the valve core (20) is in a position for opening the valve port (12).

5. A solenoid shut-off valve according to claim 3, characterised in that the diameter of the first and third bore sections (31, 33) is greater than the diameter of the second bore section (32), the second bore section (32) being adapted to the first section (21) of the spool (20) for guiding the first section (21) of the spool (20).

6. The electromagnetic shut-off valve according to claim 3, further comprising an elastic member (60), the elastic member (60) being disposed between the fixed iron core (30) and the movable iron core (50), one end of the elastic member (60) being connected with the fixed iron core (30), the other end of the elastic member (60) being connected with the movable iron core (50) and being located in the first hole section (31).

7. The electromagnetic shut-off valve according to claim 1, further comprising a first seal (70), the first seal (70) surrounding the outer periphery of the second section (22) of the valve spool (20) proximate the valve port (12), the first seal (70) being cooperable with the inner wall of the valve body (10) to seal the valve port (12).

8. The electromagnetic shut-off valve according to claim 7, characterized in that the valve body (10) is provided with a flow opening (13), the flow opening (13) being provided in a side wall of the valve body (10), the flow opening (13) being in flow communication with the receiving chamber (11), the electromagnetic shut-off valve further comprising a second sealing member (80), the second sealing member (80) being provided in an outer side wall of the second section (22) of the valve cartridge (20), the second sealing member (80) being capable of sealing in cooperation with a side wall of the receiving chamber (11), the flow opening (13) being located between the first sealing member (70) and the second sealing member (80) when the valve cartridge (20) is in a position closing the valve port (12).

9. The electromagnetic shut-off valve according to claim 1, characterized in that the balancing channel has a first flow channel (25) and a second flow channel (26) arranged in a stepwise sequence in the axial direction, the first flow channel (25) being located in the first section (21) of the valve spool (20), the second flow channel (26) being located in the second section (22) of the valve spool (20), the inner diameter of the first flow channel (25) being smaller than the inner diameter of the second flow channel (26).

10. The electromagnetic shut-off valve according to claim 7, wherein the valve body (10) comprises a body (14) and a valve seat (15), the body (14) having a mounting hole, the valve seat (15) being connected to the body (14) and being located in the mounting hole, the valve seat (15) having the valve port (12), the first seal (70) being disposed between the valve spool (20) and the mounting hole.