Normally closed electromagnetic valve

Abstract

The normally-closed electromagnetic valve comprises a valve seat, a valve cavity is formed in the valve seat, a groove and a connecting channel are arranged on the side wall of the valve cavity, the groove extends in the circumferential direction of the valve seat, and the connecting channel is connected with the end face of the groove and communicated with the outside; the valve body is installed in the valve cavity, a connecting arm is arranged on the side portion of the valve body, and the connecting arm is connected into the groove in a clamped mode; a protruding part is arranged at the bottom end of the connecting arm and used for abutting against the inner wall of the groove after the connecting arm is embedded into the groove so as to lock the valve body. A flow guide channel is formed in the valve body and provided with a flow guide hole, and the flow guide hole is used for guiding fluid out to the connecting channel. And the magnet assembly is connected with the valve body to block the flow guide hole when being powered off and is used for moving away from the valve body when being powered on to open the flow guide hole. The valve body can be embedded into the groove of the valve seat through the connecting arm and abuts against the inner wall of the groove through the protruding part so that the valve body can be locked, and the connection stability of the valve body can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of solenoid valves, and in particular to a normally closed solenoid valve. Background Art

[0002] The normally closed solenoid valve is composed of an electromagnet and a valve body. When the solenoid valve is energized, the electromagnet will generate a magnetic field, attracting the electromagnet located above the valve body to move upward and drive the valve body to open, thereby allowing the fluid to pass through the valve. When the power is off, the magnetic field of the electromagnet disappears and the valve body is reset to close, thereby blocking the fluid from passing through the valve. Therefore, automation and remote control can be achieved through the normally closed solenoid valve to adjust flow, pressure, etc.

[0003] During the use of the solenoid valve, when it is in a power-off state, the electromagnet needs to be reset close to the valve body to seal the valve body. During this process, the electromagnet will exert a certain impact force on the valve body. After long-term use, the valve body is prone to loosening due to repeated collisions of the electromagnet, affecting the use of the entire structure. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention aims to provide a normally closed solenoid valve, whose valve body can be embedded in the groove of the valve seat through a connecting arm, and the protrusion abuts against the inner wall of the groove to lock the valve body and improve the connection stability of the valve body.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] A normally closed solenoid valve, comprising:

[0007] A valve seat, wherein a valve cavity is provided in the valve seat, and a groove and a connecting channel are provided on the side wall of the valve cavity, wherein the groove extends along the circumference of the valve seat, and the connecting channel is connected with the end surface of the groove and communicated with the outside;

[0008] A valve body, the valve body is installed in the valve cavity, a connecting arm is provided on the side of the valve body, the connecting arm is clamped into the groove; and a protrusion is provided at the bottom end of the connecting arm, the protrusion is used to abut against the inner wall of the groove after the connecting arm is embedded in the groove to lock the valve body; a diversion channel is provided in the valve body, the diversion channel has a diversion hole, and the diversion hole is used to guide the fluid to the connecting channel;

[0009] A magnet assembly is connected to the valve body to block the flow guide hole when the power is off, and is used to move away from the valve body to open the flow guide hole when the power is on.

[0010] In the first aspect of the present invention, as a preferred embodiment, a connecting arm is arranged on the periphery of the valve body, and the connecting arm is embedded in a groove in the valve body. After being embedded in the groove, the protrusion is pressed against the inner wall of the groove to lock the valve body. In this way, when the solenoid valve is working, it is not easy to loosen due to the collision generated during the movement of the magnet assembly, and the entire connection structure is more stable.

[0011] In the first aspect of the present invention, as a preferred embodiment, the groove includes a first connecting groove section and a second connecting groove section, the first connecting groove section is arranged along the axial direction of the valve seat, and the second connecting groove section is arranged along the radial direction of the valve seat and is connected with the first connecting groove section; one end of the valve body is penetrated in the first connecting groove section, and the other end of the valve body is connected to the second connecting groove section through the connecting arm, wherein after the connecting arm is connected to the second connecting groove section, the protrusion extends into the first connecting groove section and abuts against the inner wall of the first connecting groove section. In this way, by providing two groove sections, the connection area between the side of the valve body and the groove in the vertical direction can be increased, and when the valve body is subjected to impact force, it can disperse the force, the probability of vibration is smaller, and the valve body is more stable after installation.

[0012] In the first aspect of the present invention, as a preferred embodiment, the first connecting groove section has a first guiding slope, and the protruding portion has a second guiding slope, and the first guiding slope is used to guide the protruding portion to extend into the first connecting groove section and abut against the second guiding slope. In this way, by respectively providing the first guiding slope and the second guiding slope, it is convenient for the protruding portion to slide into the first connecting groove section, and the connecting surface between the protruding portion and the first connecting groove section is increased by the slope, so that the structure is more stable after the two are connected.

[0013] In the first aspect of the present invention, as a preferred embodiment, the magnet assembly includes a fixed iron, a moving iron, a coil group and a connecting seat, the fixed iron is located above the moving iron and is spaced apart, the coil group is arranged around the outer periphery of the fixed iron and the moving iron, and is spaced apart from the moving iron, one end of the connecting seat is covered on the outer periphery of the moving iron, and the other end of the connecting seat extends into the valve cavity, and is spaced apart from the outer periphery of the valve body; the moving iron is used to connect with the valve body to block the guide hole when the coil group is powered off, and is used to move upwards towards the fixed iron to move away from the valve body when the coil group is powered on. In this way, the opening and closing of the valve body is achieved by arranging the fixed iron, the moving iron, the coil group and the connecting seat.

[0014] In the first aspect of the present invention, as a preferred embodiment, an elastic component is provided at the interval between the fixed iron and the movable iron, and the elastic component is used to provide an elastic stress to drive the movable iron to block the valve body. In this way, the elastic stress provided by the elastic component drives the movable iron to reset.

[0015] In the first aspect of the present invention, as a preferred embodiment, the elastic component includes a first elastic member and a second elastic member, one end of the second elastic member is inserted into the moving iron, the other end of the second elastic member is against the fixed iron, and the first elastic member is inserted into the moving iron and covers the outer periphery of the second elastic member. In this way, by providing the first elastic member and the second elastic member to increase the elastic stress between the fixed iron and the moving iron, the moving iron can move closer to the valve body more stably.

[0016] In the first aspect of the present invention, as a preferred embodiment, a through-connection groove is provided in one end of the moving iron close to the fixed iron, and the through-connection groove includes a first groove section and a second groove section, the first groove section has a through-connection interface, and the two ends of the first groove section extend along the radial direction of the moving iron respectively, the second groove section is located below the first groove section and is connected with the first groove section, the second groove section extends along the axial direction of the moving iron, the first elastic member is installed in the first groove section, and the second elastic member passes through the first groove section and is installed in the second groove section. In this way, by setting the through-connection groove to install the first elastic member and the second elastic member, the use of connecting members is reduced, and the structure is also stable.

[0017] In the first aspect of the present invention, as a preferred embodiment, the valve body is further provided with a flow guide port, the flow guide port is connected with the flow guide channel, and is used to guide the fluid into the flow guide channel; the valve cavity is further provided with a sealing member, the sealing member is located at one end of the valve body close to the flow guide port, and is sealed between the inner wall of the valve cavity and the outer periphery of the valve body. In this way, by providing the sealing member, the probability of the fluid medium flowing into the valve cavity through the flow guide port is reduced.

[0018] In the first aspect of the present invention, as a preferred embodiment, the movable iron has a plugging member at one end close to the valve body, and the plugging member is made of elastic rubber material. Thus, by providing the plugging member, the risk of the fluid medium flowing out from the connection gap between the guide hole and the movable iron is reduced.

[0019] In the first aspect of the present invention, as a preferred embodiment, the magnet assembly further comprises a coil seat, the coil seat is fixedly connected to the top of the valve seat, and the moving iron, the fixed iron, the coil assembly, and the connecting seat are all inserted into the coil seat. In this way, by providing the coil seat, external environmental factors are prevented from affecting the normal operation of the magnet assembly.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] When assembling the normally closed solenoid valve in the present invention, a connecting arm is provided on the outer periphery of the valve body, and the connecting arm is embedded in the groove in the valve body. After being embedded in the groove, the protrusion is pressed against the inner wall of the groove to lock the valve body. In this way, when the solenoid valve is working, it is not easy to loosen due to the collision generated during the movement of the magnet assembly, and the entire connection structure is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0023] Figure 1 is a cross-sectional view of an embodiment of the present invention;

[0024] Figure 2 This is an overall appearance diagram of an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the valve body in an embodiment of the present invention;

[0026] Figure 4 is a cross-sectional view of a valve seat in an embodiment of the present invention;

[0027] Figure 5 It is a schematic diagram of the structure of the moving iron in an embodiment of the present invention;

[0028] In the figure:

[0029] 10. Valve seat; 11. Connecting channel; 12. Groove; 121. First connecting groove section; 1211. First guiding slope; 122. Second connecting groove section; 13. Diversion port; 21. Moving iron; 211. Connecting groove; 2111. First groove section; 2112. Second groove section; 22. Fixed iron; 23. Coil assembly; 24. Connecting seat; 30. Valve body; 31. Connecting arm; 311. Protrusion; 3111. Second guiding slope; 32. Diversion channel; 321. Diversion hole; 40. Coil seat; 41. Terminal block; 50. First elastic member; 51. Second elastic member; 60. Blocking member; 70. Sealing member. DETAILED DESCRIPTION

[0030] Below, in conjunction with the accompanying drawings and specific embodiments, the present invention is further described. It should be noted that, under the premise of no conflict, the various embodiments described below or the various technical features can be arbitrarily combined to form a new embodiment. Except for special instructions, the materials and equipment used in this embodiment can be purchased from the market. Examples of embodiments are shown in the accompanying drawings, in which the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and the limitations of the present application cannot be understood.

[0031] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "plurality" means two or more, unless otherwise precisely and specifically specified.

[0032] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be connected through an intermediary medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] Please refer to Figure 1-5As shown, the present invention provides a normally closed solenoid valve, including: a valve seat 10, a valve body 30 and a magnet assembly, a valve cavity is provided in the valve seat 10, a groove 12 and a connecting channel 11 are provided on the side wall of the valve cavity, the groove 12 extends along the circumference of the valve seat 10, and the connecting channel 11 is connected with the end surface of the groove 12 and communicated with the outside, the valve body 30 is installed in the valve cavity, and a connecting arm 31 is provided on the side of the valve body 30, and the connecting arm 31 is clamped into the groove 12, and the bottom of the connecting arm 31 is connected to the bottom of the connecting arm 31. A protrusion 311 is provided at the end, and the protrusion 311 can be pressed against the inner wall of the groove 12 after the connecting arm 31 is embedded in the groove 12 to lock the valve body 30. In addition, a guide channel 32 is provided in the valve body 30, and the guide channel 32 has a guide hole 321. The guide hole 321 is used to guide the fluid to the connecting channel 11; and the magnet assembly is used to connect with the valve body 30 to block the guide hole 321 when the power is off, and can move away from the valve body 30 when the power is on to open the guide hole 321.

[0035] On the basis of the above structure, when using the normally closed solenoid valve of the present invention, an electromagnet can be selected as the magnet component. When the device is not powered on, the magnet component is connected to the end of the valve body 30 close to the guide hole 321 to block the guide hole 321. When it is specifically necessary to introduce a fluid medium through the normally closed solenoid valve, the circuit can be opened to make the entire component power-on. After the magnet component is powered on, it can be affected by the magnetic field and move upward toward the end away from the guide hole 321 to open the guide hole 321. At this time, the fluid medium in the guide channel 32 can be introduced into the connecting channel 11 on the side wall of the valve cavity through the guide hole 321, and then exported to the outside through the connecting channel 11 for use by the user.

[0036] Specifically, since the magnet assembly will automatically reset itself when the power is off and move closer to the valve body 30, during this process, the magnet assembly will generate a certain impact force on the valve body 30, causing it to vibrate. After long-term use, the impact generated by the process of repeated power on and off can easily cause the valve body 30 to loosen, affecting its use. Therefore, in this embodiment, during specific assembly, a connecting arm 31 is provided on the valve body 30, and the connecting arm 31 is embedded in the groove 12 in the valve cavity. Since the connecting arm 31 extends along the circumference of the valve body 30, the outer periphery of the connecting arm 31 can be snapped into the groove 12, the connecting surface between the two is larger, and the connection is more stable. In addition, since the groove 12 has a certain depth and width, the valve body 30 can disperse the force after installation, thereby effectively resisting external vibration and impact, thereby reducing the risk of the valve body 30 loosening.

[0037] More specifically, a protrusion 311 is further provided at the bottom of the connecting arm 31. When the connecting arm 31 is embedded in the groove 12, the protrusion 311 can be pressed against the inner wall of the groove 12 to further increase the connection area between the valve body 30 and the inner wall of the groove 12 through the protrusion 311, so that the connection between the valve body 30 and the valve body 30 is more stable, thereby improving the connection stability of the entire valve body 30 after installation, reducing the risk of it loosening due to long-term impact from the magnet assembly, and making the structure more stable.

[0038] It should be noted that the valve body 30 in this embodiment can adopt a cross valve or a butterfly valve, etc., and its connecting arm 31 can be a block or sheet structure that is integrally formed on the outer periphery of the valve body 30 or formed by later welding, etc., and the protrusion 311 can also be a block or sheet structure that is welded or integrally formed on the bottom of the connecting arm 31, and the groove 12 can be a groove structure that matches the connecting arm 31 and the protrusion 311, which can be extended along the circumference of the valve seat 10, and can also be mechanically cut or integrally formed inside the valve cavity in the valve seat 10.

[0039] During assembly, the magnet assembly can be fixed on the top of the valve seat 10 through the connecting seat 24 or the mounting seat, and then the magnet assembly is inserted into the connecting seat 24 or the mounting seat and connected to the valve body 30 .

[0040] Furthermore, the above-mentioned groove 12 includes a first connecting groove section 121 and a second connecting groove section 122. The first connecting groove section 121 is arranged along the axial direction of the valve seat 10, and the second connecting groove section 122 is arranged along the radial direction of the valve seat 10 and is connected with the first connecting groove section 121. After the valve body 30 passes through the first connecting groove section 121, it is clamped to the second connecting groove section 122 through the connecting arm 31. After the connecting arm 31 is clamped to the second connecting groove section 122, the protrusion 311 extends into the first connecting groove section 121 and abuts against the inner wall of the first connecting groove section 121.

[0041] Based on this structure, during assembly, the valve body 30 can be vertically extended into the first connecting groove section 121 axially arranged along the valve seat 10, so as to fix the vertical end of the valve body 30 through the first connecting groove section 121, and then after the valve body 30 is extended into the first connecting groove section 121, its side wall is embedded in the second connecting groove section 122 radially arranged along the valve seat 10 through the connecting arm 31, so that the valve body 30 can be fixed both laterally and vertically, and the valve body 30 is more stable after connection.

[0042] Specifically, the protrusion 311 on the connecting arm 31 can be set at one end of the connecting arm 31 facing the first connecting groove section 121. In this way, after the valve body 30 is extended into the first connecting groove section 121, the connecting arm 31 can be extended into the first connecting groove section 121 through the protrusion 311 after being installed in the second connecting groove section 122, and abut against the inner wall of the first connecting groove section 121. At this time, the protrusion 311 abuts against the gap between the outer end surface of the valve body 30 in the first connecting groove section 121 and the inner wall of the first connecting groove section 121, thereby reducing the probability of looseness between the two due to the existence of the gap, and the structure is more stable.

[0043] It should be noted that, compared with setting the groove 12 as a single groove section, setting two groove sections in the present embodiment can increase the connection area between the valve body 30 and the groove 12 on the side and in the vertical direction. When the valve body 30 is subjected to impact force, it can disperse the force, and the probability of vibration is smaller. The valve body is also more stable after installation. The protrusion 311 can be formed of a sheet structure so that it can extend into the gap between the first connecting groove section 121 and the valve body 30 to lock the valve body 30.

[0044] Preferably, the protruding block in the present embodiment is a block-shaped structure protruding from the bottom end surface of the connecting arm 31. During assembly, a second guiding bevel 3111 is provided on the protruding block, and a first guiding bevel 1211 is provided on the inner wall of the first connecting groove section 121. Specifically, the first guiding bevel 1211 can be provided at the junction of the second connecting groove section 122 and the first connecting groove section 121, so as to guide the protruding block to slide into the first connecting groove section 121 through the bevel, so that the protruding portion 311 can slide smoothly into the first connecting groove section 121 through the second guiding bevel 3111 under the guidance of the first guiding bevel 1211, so as to fill between the outer periphery of the valve body 30 and the first connecting groove section 121, so as to lock the valve body 30 and prevent it from loosening easily.

[0045] In addition, after the protrusion 311 extends into the first connecting groove section 121, the first guiding bevel 1211 and the second guiding bevel 3111 can abut against each other to increase the connection surface between the protrusion 311 and the first connecting groove section 121 through the bevel, so that the structure is more stable after the two are connected. Specifically, the first guiding bevel 1211 and the second guiding bevel 3111 can be set to be matching bevels or arc surfaces.

[0046] Furthermore, the magnet assembly in this embodiment includes a fixed iron 22, a moving iron 21, a coil group 23 and a connecting seat 24. The fixed iron 22 is located above the moving iron 21 and is spaced apart. The coil group 23 is arranged around the outer periphery of the fixed iron 22 and the moving iron 21, and is spaced apart from the moving iron 21. One end of the connecting seat 24 is covered around the outer periphery of the moving iron 21, and the other end of the connecting seat 24 extends into the valve cavity and is spaced apart from the outer periphery of the valve body 30. The moving iron 21 is used to connect to the valve body 30 to block the guide hole 321 when the coil group 23 is powered on, and can move upward toward the fixed iron 22 to move away from the valve body 30 when the coil group 23 is powered on.

[0047] On the basis of this structure, during assembly, the coil group 23 can be firstly arranged around the outer periphery of the fixed iron 22 and the moving iron 21 through a winding frame or other brackets. Specifically, after the coil group 23 is wound, an enclosed space is formed inside. The fixed iron 22 can be fixed on the top of the coil group 23 by connecting parts such as bolts or screws, and one end of the moving iron 21 can be arranged in the space enclosed by the coil group 23 and below the fixed iron 22. The other end of the moving iron 21 can be movably inserted into one end of the connecting seat 24, and the other end of the connecting seat 24 extends into the valve cavity and is sleeved on the outer periphery of the valve body 30. After the connecting seat 24 is connected to the valve seat 10, the moving iron 21 can always be adsorbed on the valve body 30 of the magnetic conductive material due to its own magnetism, so that it can block the guide hole 321 when the power is off, so that the valve body 30 is in a normally closed state.

[0048] When the coil group 23 is powered off, the moving iron 21 is connected to the valve body 30 and the guide hole 321 is blocked. When the fluid medium needs to be introduced through the valve body 30, the coil group 23 can be energized. At this time, the coil group 23 cooperates with the fixed iron 22 to generate a magnetic field to attract the moving iron 21, driving the moving iron 21 to move away from the valve body 30, thereby opening the guide hole 321 and putting the valve body 30 in an open state.

[0049] In addition, by arranging the movable iron 21 and the fixed iron 22 and the coil assembly 23 at intervals, a certain movement space is provided for the movable iron 21 to move up and down to open or close the valve body 30 .

[0050] More specifically, after the moving iron 21 is sealed in the guide hole 321, due to the material of the moving iron 21 itself, the liquid in the guide channel 32 may still flow out from the connection gap between the guide hole 321 and the moving iron 21, resulting in leakage. Therefore, in this embodiment, a sealing member 60 is provided at one end of the moving iron 21 close to the valve body 30. The sealing member 60 is made of elastic rubber material. Since the elastic rubber material has good deformation ability and resilience, it can fit tightly to the sealing surface, thereby effectively preventing leakage of the fluid medium.

[0051] Preferably, the elastic glue can be made of existing materials such as silicone or rubber.

[0052] Furthermore, in order to prevent the moving iron 21 from being difficult to reset after being adsorbed by the fixed iron 22, an elastic component is provided in the interval between the fixed iron 22 and the moving iron 21. The specific elastic component can be connected to the fixed iron 22 and the moving iron 21 respectively. When the coil group 23 is powered off, the fixed iron 22 has no adsorption force, the elastic component is stretched, and an elastic stress is provided during the stretching process to drive the moving iron 21 to move closer to the valve body 30 to block the valve body 30.

[0053] When the coil assembly 23 is energized, the movable iron 21 moves toward the fixed iron 22 under the action of the magnetic field. At this time, the elastic component may be compressed, and the movable iron 21 may move toward the fixed iron 22 to open the valve body 30 .

[0054] The specific elastic component can be an existing elastic component such as a spring or an elastic sheet.

[0055] Furthermore, the elastic component in this embodiment includes a first elastic member 50 and a second elastic member 51, one end of the second elastic member 51 is inserted into the moving iron 21, and the other end of the second elastic member 51 is abutted against the fixed iron 22, and the first elastic member 50 is inserted into the moving iron 21 and covered on the outer periphery of the second elastic member 51.

[0056] Specifically, in order to increase the elastic stress of the elastic component and reduce the phenomenon that the moving iron 21 cannot be reset due to the constant elastic stress, the elastic component in this embodiment includes a first elastic member 50 and a second elastic member 51. During assembly, one end of the second elastic member 51 is inserted into the moving iron 21, and the other end of the second elastic member 51 abuts against the fixed iron 22, so that the moving iron 21 and the fixed iron 22 are connected through the second elastic member 51, and then the first elastic member 50 is inserted into the moving iron 21 and covered on the outer periphery of the second elastic member 51 to increase the elastic stress of the entire elastic component, so that the entire component has sufficient elastic force to drive the moving iron 21 to reset.

[0057] Preferably, the first elastic member 50 and the second elastic member 51 can both be linear springs, and the inner diameter of the first elastic member 50 is greater than the inner diameter of the second elastic member 51 , and the two can be connected by gluing or welding.

[0058] Furthermore, a through-connection groove 211 is provided in one end of the moving iron 21 close to the fixed iron 22, and the through-connection groove 211 includes a first groove section 2111 and a second groove section 2112. The first groove section 2111 has a through-connection interface, and the two ends of the first groove section 2111 extend along the radial direction of the moving iron 21 respectively. The second groove section 2112 is located below the first groove section 2111 and is connected with the first groove section 2111. The second groove section 2112 extends along the axial direction of the moving iron 21. The first elastic member 50 is installed on the first groove section 2111, and the second elastic member 51 passes through the first groove section 2111 and is installed on the second groove section 2112.

[0059] Specifically, a through-connection groove 211 is further provided in the moving iron 21, and the through-connection groove 211 includes a first groove section 2111 and a second groove section 2112. During assembly, the second elastic member 51 can be embedded in the second groove section 2112 through the through-connection interface, and then the first elastic member 50 is covered on the outer periphery of the second elastic member 51 and installed in the first groove section 2111. The two elastic members are respectively installed through two groove sections, and the structure is more stable.

[0060] Furthermore, a guide port 13 is provided on the valve body 30, which is connected to the guide channel 32 and guides the fluid into the guide channel 32. A seal 70 is also provided in the valve cavity. The seal 70 is located at one end of the valve body 30 close to the guide port 13 and is sealed between the inner wall of the valve cavity and the outer periphery of the valve body 30.

[0061] Specifically, a guide port 13 is also provided on the valve body 30, and the guide port 13 is connected with the guide channel 32 so as to introduce the fluid medium into the guide channel 32 through the guide port 13. In addition, a seal 70 is also provided at one end of the valve body 30 close to the guide port 13. By sealing the seal 70 between the inner wall of the valve cavity and the outer periphery of the valve body 30, the risk of the fluid medium introduced at the guide port 13 flowing into the interior of the valve cavity from the gap between the valve body 30 and the inner wall of the valve cavity is reduced.

[0062] Preferably, the sealing member 70 can be made of materials such as silicone or rubber, which has better sealing performance.

[0063] More specifically, the magnet assembly also includes a coil seat 40. When assembled, the coil seat 40 is fixedly connected to the top of the valve seat 10, and the moving iron 21, the fixed iron 22, the coil group 23, and the connecting seat 24 can be inserted into the coil seat 40 to connect with the valve seat 10 through the coil seat 40 to prevent external environmental factors from affecting the normal operation of the magnet assembly. In addition, a wiring terminal 41 is also provided on the top of the coil seat 40, and the wiring terminal 41 can be connected to the coil group 23 to connect to the external circuit through the wiring terminal 41, and the structure is more practical.

[0064] The above implementation modes are only preferred implementation modes of the embodiments of the present invention and cannot be used to limit the protection scope of the embodiments of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the embodiments of the present invention shall fall within the scope of protection required by the embodiments of the present invention.

Claims

1. A normally closed solenoid valve, characterized in that: include: A valve seat, wherein a valve cavity is provided in the valve seat, and a groove and a connecting channel are provided on the side wall of the valve cavity, wherein the groove extends along the circumference of the valve seat, and the connecting channel is connected with the end surface of the groove and communicated with the outside; A valve body, the valve body is installed in the valve cavity, a connecting arm is provided on the side of the valve body, the connecting arm is clamped into the groove; and a protrusion is provided at the bottom end of the connecting arm, the protrusion is used to abut against the inner wall of the groove after the connecting arm is embedded in the groove, so as to lock the valve body; The valve body is provided with a flow guide channel, the flow guide channel has a flow guide hole, and the flow guide hole is used to guide the fluid to the connecting channel; A magnet assembly is connected to the valve body to block the flow guide hole when the power is off, and is used to move away from the valve body to open the flow guide hole when the power is on.

2. The normally closed solenoid valve according to claim 1, characterized in that: The groove includes a first connecting groove section and a second connecting groove section, the first connecting groove section is arranged along the axial direction of the valve seat, and the second connecting groove section is arranged along the radial direction of the valve seat and is connected with the first connecting groove section; one end of the valve body is penetrated by the first connecting groove section, and the other end of the valve body is connected to the second connecting groove section through the connecting arm, wherein after the connecting arm is connected to the second connecting groove section, the protrusion extends into the first connecting groove section and abuts against the inner wall of the first connecting groove section.

3. The normally closed solenoid valve according to claim 2, characterized in that: The first connecting groove section has a first guiding slope, and the protruding portion has a second guiding slope. The first guiding slope is used to guide the protruding portion to extend into the first connecting groove section and abut against the second guiding slope.

4. The normally closed solenoid valve according to claim 1, characterized in that: The magnet assembly includes a fixed iron, a moving iron, a coil group and a connecting seat, the fixed iron is located above the moving iron and is spaced apart, the coil group is arranged around the outer periphery of the fixed iron and the moving iron, and is spaced apart from the moving iron, one end of the connecting seat is covered around the outer periphery of the moving iron, and the other end of the connecting seat extends into the valve cavity and is spaced apart from the outer periphery of the valve body; the moving iron is used to connect with the valve body to block the guide hole when the coil group is powered off, and is used to move upward close to the fixed iron to move away from the valve body when the coil group is powered on.

5. The normally closed solenoid valve according to claim 4, characterized in that: An elastic component is provided at the interval between the fixed iron and the moving iron, and the elastic component is used to provide an elastic stress to drive the moving iron to block the valve body.

6. The normally closed solenoid valve according to claim 5, characterized in that: The elastic component includes a first elastic member and a second elastic member, one end of the second elastic member is inserted into the moving iron, the other end of the second elastic member abuts against the fixed iron, and the first elastic member is inserted into the moving iron and covers the outer periphery of the second elastic member.

7. The normally closed solenoid valve according to claim 6, characterized in that: A through-connection groove is provided in one end of the moving iron close to the fixed iron, and the through-connection groove includes a first groove section and a second groove section, the first groove section has a through-connection interface, and the first groove section extends along the circumferential direction of the moving iron, the second groove section is located below the first groove section and is connected with the first groove section, the second groove section extends along the axial direction of the moving iron, the first elastic member is installed in the first groove section, and the second elastic member passes through the first groove section and is installed in the second groove section.

8. The normally closed solenoid valve according to claim 1, characterized in that: The valve body is also provided with a guide port, which is connected to the guide channel and is used to guide the fluid into the guide channel; the valve cavity is also provided with a sealing member, which is located at one end of the valve body close to the guide port and is sealed between the inner wall of the valve cavity and the outer periphery of the valve body.

9. The normally closed solenoid valve according to claim 4, characterized in that: One end of the moving iron close to the valve body is provided with a blocking piece, and the blocking piece is made of elastic rubber material.

10. The normally closed solenoid valve according to claim 4, characterized in that: The magnet assembly also includes a coil seat, which is fixedly connected to the top of the valve seat. The moving iron, the fixed iron, the coil group, and the connecting seat are all inserted into the coil seat.

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