Electromagnetic stop valve

Abstract

The application provides an electromagnetic stop valve, which comprises a valve body, a drive assembly and a valve core, wherein the valve body is provided with a containing cavity, one end of the containing cavity is provided with a valve port, the valve port is communicated with the containing cavity, the drive assembly is at least partially arranged in the containing cavity and is located at one end of the containing cavity away from the valve port, and the valve core is movably arranged in the containing cavity and is provided with a first section and a second section arranged in a stepped manner, the first section of the valve core is connected with the drive assembly, the second section of the valve core is arranged corresponding to the valve port, the valve port is opened or closed through the second section of the valve core, and the valve core is further provided with a balance channel and a balance hole which are communicated with each other, the balance channel penetrates through the valve core in an axial direction, the balance hole is arranged 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. Through the technical scheme, the problem of pressure imbalance at both ends of the valve core of the electromagnetic stop valve in the prior art can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic valves, in particular to an electromagnetic stop valve. BACKGROUND

[0002] At present, the existing electromagnetic stop valve comprises a valve body, a valve core and a driving member, the valve body has 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 moving iron core, the driving member is fixedly connected with the valve core and can drive the valve core to open or block the valve port, when the device is running, since the medium flowing through the valve port will generate pressure on one end of the valve core, pressure difference will occur between the two ends of the valve core, which will limit the movement of the valve core, so that the valve core cannot normally open or block the valve port, thereby the stability of the device during operation cannot be guaranteed, and the normal operation of the device is affected. SUMMARY

[0003] The present application provides an electromagnetic stop valve to solve the problem of pressure imbalance between the two ends of the valve core in the prior art.

[0004] The present application provides an electromagnetic stop valve, which comprises a valve body having a containing cavity, the containing cavity is provided with a valve port at one end, the valve port is communicated with the containing cavity; a driving assembly is at least partially arranged in the containing cavity, the driving assembly is located at the end of the containing cavity away from the valve port; a valve core is movably arranged in the containing cavity, the valve core has a first section and a second section arranged in a stepped manner, the first section of the valve core is connected with the driving assembly, the second section of the valve core is arranged corresponding to the valve port to open or close the valve port through the second section of the valve core, the valve core further has a balance channel and a balance hole which are communicated with each other, the balance channel penetrates the valve core along the axial direction, the balance hole is arranged 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.

[0005] According to the technical scheme of the present application, the balance channel and the balance hole which are communicated with each other are arranged on the valve core, the balance channel penetrates the valve core along the axial direction, and one end of the balance hole is arranged on the side wall of the valve core, the balance channel can be communicated with the valve port during the operation of the device, by arranging the balance channel and communicating it with the valve port, the pressure at the two ends of the valve core can be kept consistent, and since the first section of the valve core is connected with the driving assembly, the space between the driving assembly and the valve core can be communicated with the valve port through the balance hole, so that the pressure at the two ends of the driving assembly and the valve core is kept consistent, by arranging the above structure, the pressure at each connection in the valve body can be kept consistent, the pressure at the two ends of the valve core is kept consistent, and the problem that the valve cannot be conveniently opened or closed due to the pressure difference at the two ends of the valve core can be effectively avoided, thereby the stability of the device during operation is improved, and the normal operation of the device is guaranteed.

[0006] Further, the driving assembly comprises: a fixed iron core having a first end and a second end arranged oppositely, the first end of the fixed iron core is fixed at one end of the valve body away from the valve port; a sleeve pipe is sleeved on the second end of the fixed iron core; a movable iron core is movably arranged in the sleeve pipe and located at one end of the fixed iron core away from the valve port, the first section of the valve core passes through the fixed iron core and is connected with the movable iron core, and the fixed iron core cooperates with the movable iron core to drive the valve core to move in the accommodating cavity. By arranging the above structure, the fixed iron core and the movable iron core are connected with the sleeve pipe, and during operation of the device, the fixed iron core can be attracted to or separated from the movable iron core to block or open the valve port. The above driving mode is reasonable and simple in structure, which not only meets the normal driving of the device, but also facilitates the disassembly of the device, thereby improving the disassembly efficiency of the device.

[0007] Further, the fixed iron core is sequentially provided with a first hole section, a second hole section and a third hole section along the axial direction, the first hole section passes through the first end of the fixed iron core, the second hole section passes through 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. In this way, during operation of the device, the medium can flow through the first hole section and / or the third hole section through the balance hole, so that the pressure of the first hole section and / or the third hole section is equal to the pressure at the valve port, the pressure balance between the inside of the fixed iron core and the valve port can be realized, and the normal operation of the valve core can be ensured, and the stability of the device during operation is further improved.

[0008] Further, the balance hole comprises a first through hole and a second through hole, the first through hole and the second through hole are arranged on the first section of the valve core in the axial direction, and the first through hole and the second through hole extend in the radial direction of the valve core. When the valve core is in the position of opening the valve port, the first through hole is located in the first hole section, and the second through hole is located in the third hole section. In this way, the number of balance holes is set to two, and during operation of the device, the first through hole and the second through hole can respectively make the pressure of the first hole section and the third hole section consistent with the pressure of the valve core, so as to ensure the pressure balance of each connection inside the valve body as much as possible. In this way, the space of the valve core is reasonably utilized, and the balance of the internal pressure of the device is also met, and the normal operation of the device is ensured.

[0009] Further, the diameters of the first hole section and the third hole section are greater than the diameter of the second hole section, and the second hole section is matched with the first section of the valve core to guide the first section of the valve core. By arranging the above structure, the first hole section and the second hole section are arranged in a stepped manner, which is conducive to meeting the installation requirements of the device, and the second hole section can be used in cooperation with the valve core. In this way, the fixed iron core will not interfere with the valve core during operation of the device, so as to ensure the stability of the valve core during operation.

[0010] Further, the electromagnetic stop valve further comprises an elastic member, the elastic member is arranged between the fixed iron core and the movable iron core, one end of the elastic member is connected with the fixed iron core, and the other end of the elastic member is connected with the movable iron core and located in the first hole section. In this way, during operation, the elastic force of the elastic member can act on the movable iron core, so that the movable iron core is in a position to open the valve port, thereby achieving the opening function of the valve body.

[0011] Further, the electromagnetic stop valve further comprises a first sealing member, the first sealing member is arranged around the outer periphery of the second section of the valve core close to the valve port, and the first sealing member can cooperate with the inner wall of the valve body to seal the valve port. Through the above structure, the first sealing member can seal the valve port, so as to realize the radial sealing of the connection between the second end of the valve core and the valve port, thereby effectively reducing the internal leakage of the device, and improving the sealing effect of the device.

[0012] Further, the valve body is provided with a flow-through hole, the flow-through hole is arranged on the side wall of the valve body and communicates with the accommodating cavity, and the electromagnetic stop valve further comprises a second sealing member, the second sealing member is arranged on the outer side wall of the second section of the valve core, and the second sealing member can cooperate with the side wall of the accommodating cavity to seal, when the valve core is in a position to close the valve port, the flow-through hole is located between the first sealing member and the second sealing member. The second sealing member is used to seal the connection between the accommodating cavity and the valve core, so as to avoid leakage of the medium at this position. Through the above structure, the sealing effect of the device can be further improved.

[0013] Further, the balance channel has a first flow-through channel and a second flow-through channel arranged in sequence along the axial direction in steps, the first flow-through channel is located in the first section of the valve core, the second flow-through channel is located in the second section of the valve core, and the inner diameter of the first flow-through channel is smaller than that of the second flow-through channel. In this way, the large-diameter internal balance function of the device can be realized, and at the same time, the inner diameter size of the second flow-through channel can be adjusted according to the flow demand of the valve port, so as to improve the applicability of the device, thereby improving the use range of the device.

[0014] Further, the valve body comprises a body and a valve seat, the body has a mounting hole, the valve seat is connected with the body and located in the mounting hole, the valve seat has a valve port, and the first sealing member is arranged between the valve core and the mounting hole. The above arrangement makes the device easier to disassemble and assemble, reduces the difficulty of disassembly and assembly of the device, and at the same time, arranging the valve seat in the mounting hole is conducive to reducing the overall volume of the device, thereby realizing the miniaturization of the device. BRIEF DESCRIPTION OF DRAWINGS

[0015] The drawings constituting a part of the specification of this application are used to provide further understanding of the present application, the illustrative embodiments of the present application and the description thereof serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0016] Figure 1A structural schematic diagram of the electromagnetic stop valve provided by the embodiment of the present application is shown.

[0017] The above drawings include the following reference signs:

[0018] 10, valve body; 11, accommodating cavity; 12, valve port; 13, flow-through hole; 14, body; 15, valve seat;

[0019] 20, valve core; 21, first section; 22, second section; 23, first through hole; 24, second through hole; 25, first flow-through channel; 26, second flow-through channel;

[0020] 30, fixed core; 31, first hole section; 32, second hole section; 33, third hole section;

[0021] 40, sleeve; 50, moving core; 60, elastic member; 70, first sealing member; 80, second sealing member; 90, coil. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The description of the at least one exemplary embodiment is actually only illustrative in nature and by no means as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0023] As shown in the drawings, Figure 1 The present application provides an electromagnetic stop valve, which comprises a valve body 10, a driving assembly and a valve core 20. The driving assembly has an accommodating cavity 11, one end of the accommodating cavity 11 is provided with a valve port 12, the valve port 12 is in communication with the accommodating cavity 11, the driving assembly is at least partially arranged in the accommodating cavity 11, the driving assembly is located at an 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 has a first section 21 and a second section 22 arranged in a stepped manner, the first section 21 of the valve core 20 is connected with the driving assembly, the second section 22 of the valve core 20 is arranged corresponding to the valve port 12, so as to open or close the valve port 12 through the second section 22 of the valve core 20, the valve core 20 further has a balance channel and a balance hole in communication with each other, the balance channel penetrates the valve core 20 in the axial direction, the balance hole is arranged on 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 embodiments of the present application, the balance hole is arranged on the valve core 20 in the radial direction, of course, the balance hole can also be arranged at other angles with the first section 21 of the valve core 20, and the specific arrangement can be made according to the actual use requirements of the device, so as to improve the applicability of the device.

[0024] The technical scheme of the present application is characterized in that the valve core 20 is provided with a balance channel and a balance hole in communication with each other, the balance channel penetrates the valve core 20 in the axial direction, and one end of the balance hole is arranged on the side wall of the valve core 20. During operation of the device, the balance channel can be in communication with the valve port 12. By arranging the balance channel and making it in communication with the valve port 12, the pressure at both ends of the valve core 20 can be kept consistent. At the same time, since the first section 21 of the valve core 20 is connected with the driving assembly, the space between the driving assembly and the valve core 20 can be communicated with the valve port 12 through the balance hole, so that the pressure at both ends of the driving assembly and the valve core 20 can be kept consistent. By arranging the above structure, the pressure at each connection in the valve body 10 can be kept consistent, the pressure at both ends of the valve core 20 can be kept consistent, and the problem that the valve cannot be conveniently opened or closed due to the pressure difference at both ends of the valve core 20 can be effectively avoided, thereby improving the stability of the device during operation and ensuring the normal operation of the device.

[0025] Further, the driving assembly comprises a fixed iron core 30, a sleeve 40 and a movable iron core 50. The fixed iron core 30 has a first end and a second end arranged oppositely, the first end of the fixed iron core 30 is fixed at one end of the valve body 10 away from the valve port 12, the sleeve 40 is sleeved on the second end of the fixed iron core 30, the movable iron core 50 is movably arranged in the sleeve 40 and located at one end of the fixed iron core 30 away from the valve port 12, the first section 21 of the valve core 20 penetrates the fixed iron core 30 and is connected with the movable iron core 50, and the fixed iron core 30 cooperates with the movable iron core 50 to drive the valve core 20 to move in the accommodating cavity 11. By arranging the above structure, the fixed iron core 30 and the movable iron core 50 are connected with the sleeve 40. During operation of the device, the fixed iron core 30 can be attracted or separated from the movable iron core 50 to block or open the valve port 12. The above driving mode is reasonable and simple in structure, can meet the normal driving of the device, and is convenient for disassembly and assembly of the device, thereby improving the disassembly and assembly efficiency of the device.

[0026] In the embodiment of the present application, the driving assembly further comprises a coil 90, the coil 90 is arranged around the outer periphery of the sleeve 40, and the coil 90 can generate a magnetic force after being energized, which can drive the movable iron core 50 to move to block the valve port 12.

[0027] Specifically, in the embodiment of the present application, the fixed iron core 30 is sequentially provided with the first hole section 31, the second hole section 32 and the third hole section 33 in the axial direction, the first hole section 31 is penetrated by the first end of the fixed iron core 30, the second hole section 32 is penetrated by the second end of the fixed iron core 30, and the balance hole is located in the space between the first hole section 31 and the moving iron core 50 and in the space between the third hole section 33 and the valve core 20. In this way, during the operation of the device, the pressure of the first hole section 31 and / or the third hole section 33 can be balanced through the balance hole, 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, which can further realize the pressure balance between the inside of the fixed iron core 30 and the valve port 12, ensure the normal operation of the valve core 20, and further improve the stability of the device during operation.

[0028] Further, the balance hole includes a first through hole 23 and a second through hole 24, which are arranged on the first section 21 of the valve core 20 in the axial direction, and both of which extend in the radial direction of the valve core 20. When the valve core 20 is in a position to open 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. In this way, the number of balance holes is set to two, and during the operation of the device, the first through hole 23 and the second through hole 24 can respectively make the pressure of the first hole section 31 and the third hole section 33 consistent with that of the valve core 20, so as to ensure the pressure balance of each connection inside the valve body 10 as much as possible. In this way, not only the space of the valve core 20 is reasonably utilized, but also the internal pressure balance of the device is met, and the normal operation of the device is ensured.

[0029] Of course, in other embodiments of the present application, the number of balance holes can also be set to multiple, which can further improve the internal balance effect of the device, but at the same time, it will increase the processing difficulty of the valve core 20. Therefore, the appropriate number of balance holes can be selected according to the actual use requirements of the device.

[0030] Specifically, the diameters of the first hole section 31 and the third hole section 33 are greater than that of the second hole section 32, and the second hole section 32 is matched with the first section 21 of the valve core 20 to guide the first section 21 of the valve core 20. By setting the above structure, the first hole section 31 and the second hole section 32 are set to be stepped, which is beneficial to meet the installation requirements of the device, and the second hole section 32 can be used in cooperation with the valve core 20. In this way, the fixed iron core 30 will not interfere with the valve core 20 during the operation of the device, so as to ensure the stability of the valve core 20 during operation.

[0031] Further, the electromagnetic stop valve further comprises an elastic member 60, which 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 located in the first hole section 31. In this way, in operation, the elastic force of the elastic member 60 can act on the movable iron core 50, so that the movable iron core 50 is in a position to open the valve port 12, thereby achieving the opening function of the valve body 10. Specifically, the elastic member 60 is a return spring, and in this way, the production cost is low, and the structure is simple and light in weight, thereby facilitating the light weight of the device.

[0032] Specifically, the electromagnetic stop valve further comprises a first sealing member 70, which is arranged around the outer periphery of the second section 22 of the valve core 20 close to the valve port 12, and can cooperate with the inner wall of the valve body 10 to seal the valve port 12. Through the above structure, the first sealing member 70 can seal the valve port 12, so as to achieve the radial sealing of the connection between the second end of the valve core 20 and the valve port 12, thereby effectively reducing the internal leakage of the device and improving the sealing effect of the device. In this embodiment, a groove is annularly arranged on the outer periphery of the second end of the valve core 20, and the first sealing member 70 is arranged in the annular groove. Through the above structure, the installation and dismounting of the first sealing member 70 are more convenient, and the above structure is also convenient for processing, thereby further reducing the production cost of the device. In addition, since the valve port 12 adopts this kind of radial sealing arrangement, the same force area of the valve core 20 can be better realized, the pressure difference of the valve core 20 is reduced, and the pressure balance of the two ends of the valve core 20 is more easily realized, thereby reducing the opening resistance.

[0033] Further, the valve body 10 is provided with a flow-through hole 13, which is arranged on the side wall of the valve body 10 and communicates with the accommodating cavity 11. The electromagnetic stop valve further comprises a second sealing member 80, which is arranged on the outer side wall of the second section 22 of the valve core 20 and can cooperate with the side wall of the accommodating cavity 11 to seal. When the valve core 20 is in a position to close the valve port 12, the flow-through hole 13 is located between the first sealing member 70 and the second sealing member 80. The second sealing member 80 is used to seal the connection between the accommodating cavity 11 and the valve core 20, so as to avoid leakage of the medium at this position. Through the above structure, the sealing effect of the device can be further improved.

[0034] Specifically, the balance channel has the first flow channel 25 and the second flow channel 26 arranged in sequence along the axial direction in a stepped manner, the first flow channel 25 is located in the first section 21 of the valve core 20, the second flow channel 26 is located in the second section 22 of the valve core 20, and the inner diameter of the first flow channel 25 is smaller than that of the second flow channel 26. In this way, the large-diameter 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 demand of the valve port 12, so that the applicability of the device is improved, thereby improving the use range of the device.

[0035] Further, the valve body 10 comprises the body 14 and the valve seat 15, the body 14 has a mounting hole, the valve seat 15 is connected with the body 14 and located in the mounting hole, the valve seat 15 has the valve port 12, and the first sealing element 70 is arranged between the valve core 20 and the mounting hole. The above arrangement makes the device easier to disassemble and reduces the difficulty of disassembling the device, and meanwhile, arranging the valve seat 15 in the mounting hole is beneficial to reducing the overall volume of the device, so that the miniaturization of the device can be realized. In the embodiment of the present application, the structure of the mounting hole is arranged in a stepped manner, and the valve seat 15 is arranged in correspondence with the structure of the mounting hole. The above structure not only is easy to process, but also is convenient for the installation of the device, so that the production cost is reduced while the installation efficiency of the device is further improved, and the installation time of the device is shortened.

[0036] By applying the technical scheme of the present application, the balance channel and the balance hole are arranged in communication with each other on the valve core 20, the balance channel penetrates the valve core 20 along the axial direction, and one end of the balance hole is arranged on the side wall of the valve core 20. During the operation of the device, the balance channel can be in communication with the valve port 12. By arranging the balance channel and making it in communication with the valve port 12, the pressure at both ends of the valve core 20 can be kept consistent. Meanwhile, since the first section 21 of the valve core 20 is connected with the driving assembly, the space between the driving assembly and the valve core 20 will be communicated with the valve port 12 through the balance hole, so that the pressure at both ends of the driving assembly and the valve core 20 is kept consistent. By arranging the above structure, the pressure at each connection in the valve body 10 can be kept consistent, so that the pressure at both ends of the valve core 20 is kept consistent. In this way, the problem that it is inconvenient to open or close the valve due to the pressure difference at both ends of the valve core 20 can be effectively avoided, so that the stability of the device during operation is improved, and the normal operation of the device is ensured. Meanwhile, the number of balance holes is arranged as two, and during the operation of the device, the first through hole 23 and the second through hole 24 can respectively make the first hole section 31 and the third hole section 33 consistent with the pressure of the valve core 20, so that the pressure at each connection in the valve body 10 is as equal as possible. In this way, the space of the valve core 20 is reasonably utilized, and meanwhile, the balance of the internal pressure of the device can be met, so that the normal operation of the device is ensured.

[0037] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0038] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the application unless specifically so stated. It is also to be understood that the dimensions of the various parts shown in the drawings are not drawn to scale for ease of illustration. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail, but are to be considered part of the specification, where appropriate. In all examples shown and discussed herein, any specific values are to be interpreted as illustrative only and not as a limitation. Thus, other examples of the example embodiments can have different values. It is noted that like numbers and letters on the figures identify like parts throughout the disclosure, thus, once an item is defined in one figure, it is not necessary to discuss it further in connection with other figures where it is not explicitly defined.

[0039] In the description of the present application, it is to be understood that the orientation or positional relationships indicated by terms such as "front", "back", "up", "down", "left", "right", "lateral", "vertical", "horizontal", and "top", "bottom" are generally based on the orientation or positional relationships shown in the drawings, and are used only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the scope of protection of the present application. The orientation terms "inner", "outer" refer to the inner and outer relative to the contour of the parts themselves.

[0040] For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "rear", "front", "vertical" and "horizontal" as can be perceived herein relative to the accompanying drawings refer to the orientation of the components being described. However, it is to 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 described herein relative to the other device or structure is inverted, then a spatially relative term such as "above" can be interpreted as meaning "below" or "below" can be interpreted as meaning "above". The device can also be oriented in other ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0041] In addition, it should be pointed out that the use of "first", "second" and the like words to qualify parts, is only intended to facilitate the distinction of the corresponding parts, and as no other declaration, the above words have no special meaning, and therefore cannot be understood as limiting the scope of protection of the present application.

[0042] The preferred embodiments of the present application are described above in detail. The present application, however, is not limited to the above embodiments, but can be variously changed and modified by those skilled in the art without departing from the spirit and scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the present application.

Claims

1. An electromagnetic shut-off valve, characterized in that, The electromagnetic shut-off valve includes: The valve body (10) has a receiving cavity (11), and a valve port (12) is provided at one end of the receiving cavity (11), and the valve port (12) communicates with the receiving cavity (11); A drive assembly is at least partially disposed within the receiving cavity (11), the drive assembly being located at one end of the receiving cavity (11) away from the valve port (12); A valve core (20) is movably disposed within the receiving cavity (11). The valve core (20) has a first section (21) and a second section (22) arranged in a stepped manner. The first section (21) of the valve core (20) is connected to the drive assembly. The second section (22) of the valve core (20) is disposed corresponding to the valve port (12) so as to open or close the valve port (12) through the second section (22) of the valve core (20). The valve core (20) also has a balance channel and a balance hole that are interconnected. The balance channel passes through the valve core (20) axially. The balance hole is disposed 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). The driving component includes: The fixed iron core (30) has a first end and a second end arranged opposite to each other, and the first end of the fixed iron core (30) is fixed to the end of the valve body (10) away from the valve port (12); A sleeve (40) is fitted onto the second end of the fixed iron core (30); A movable iron core (50) is movably disposed within the sleeve (40) and located at the end of the fixed iron core (30) away from the valve port (12). The first segment (21) of the valve core (20) passes through the fixed iron core (30) and is connected to the movable iron core (50). The fixed iron core (30) and the movable iron core (50) cooperate to drive the valve core (20) to move within the receiving cavity (11). A coil (90) is arranged around the outer periphery of the sleeve (40), and the coil (90) is capable of driving the moving iron core (50) to move so that the valve core (20) blocks the valve port (12). The fixed iron core (30) is provided with a first hole section (31), a second hole section (32) and a third hole section (33) in sequence along the axial direction. The first hole section (31) extends out from the first end of the fixed iron core (30), and the second hole section (32) extends out from the second end of the fixed iron core (30). The balance hole is located in the space between the first hole section (31) and the moving iron core (50), and / or in the space between the third hole section (33) and the valve core (20). 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 axially spaced on the first section (21) of the valve core (20). The first through hole (23) and the second through hole (24) both extend radially along 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).

2. The electromagnetic shut-off valve according to claim 1, characterized in that, The diameters of the first hole segment (31) and the third hole segment (33) are greater than the diameter of the second hole segment (32). The second hole segment (32) is adapted to the first segment (21) of the valve core (20) to guide the first segment (21) of the valve core (20).

3. The electromagnetic shut-off valve according to claim 1, characterized in that, The electromagnetic shut-off valve also includes an elastic element (60), which is disposed between the fixed iron core (30) and the moving iron core (50). One end of the elastic element (60) is connected to the fixed iron core (30), and the other end of the elastic element (60) is connected to the moving iron core (50) and located in the first hole section (31).

4. The electromagnetic shut-off valve according to claim 1, characterized in that, The electromagnetic shut-off valve also includes a first sealing element (70), which surrounds the outer periphery of the second section (22) of the valve core (20) near the valve port (12). The first sealing element (70) can cooperate with the inner wall of the valve body (10) to seal the valve port (12).

5. The electromagnetic shut-off valve according to claim 4, characterized in that, The valve body (10) is provided with a flow hole (13), which is located on the side wall of the valve body (10). The flow hole (13) communicates with the receiving cavity (11). The electromagnetic shut-off valve also includes a second sealing element (80), which is located on the outer side wall of the second section (22) of the valve core (20). The second sealing element (80) can cooperate with the side wall of the receiving cavity (11) to seal. When the valve core (20) is in the position of closing the valve port (12), the flow hole (13) is located between the first sealing element (70) and the second sealing element (80).

6. The electromagnetic shut-off valve according to claim 1, characterized in that, The balance channel has a first flow channel (25) and a second flow channel (26) arranged in a stepped manner along the axial direction. The first flow channel (25) is located in the first section (21) of the valve core (20), and the second flow channel (26) is located in the second section (22) of the valve core (20). The inner diameter of the first flow channel (25) is smaller than the inner diameter of the second flow channel (26).

7. The electromagnetic shut-off valve according to claim 4, characterized in that, 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 to the body (14) and located in the mounting hole. The valve seat (15) has the valve port (12). The first seal (70) is disposed between the valve core (20) and the mounting hole.

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