Normally-closed three-way electromagnetic valve
By providing a second elastic member between the moving iron and the fixed iron of the solenoid valve, a second elastic stress greater than the first elastic stress is solved, the problem of inaccurate fluid control of the existing solenoid valve under the normal closed state of the valve core is achieved, more reliable and accurate fluid control is achieved, and system vibration and noise are reduced.
Patent Information
- Application Number
- CN202420658737.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-01
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-04-01
AI Technical Summary
When the valve core is normally closed, existing solenoid valves may lead to inaccuracy or delay in fluid control due to insufficient elastic stress provided by the elastic components.
A second elastic member is provided between the moving iron and the fixed iron. The second elastic member provides a second elastic stress greater than the first elastic stress of the first elastic member, so that the first elastic member and the second elastic member are always in a compressed state to avoid unnecessary rebound.
By keeping the spring in a compressed state, unnecessary rebound is avoided, reliable and accurate operation of the solenoid valve is ensured, and system vibration and noise are reduced.
Smart Images
Figure CN222732180U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to electromagnetic valve technology, in particular to a normally closed three-way electromagnetic valve. Background Art
[0002] At present, three-way valves are widely used in hydraulic and pneumatic control systems. Its main structure is that three fluid medium interfaces are set on the valve body, and the inside of the valve body is a valve cavity connected to the three fluid medium interfaces. A movable valve core is set in the valve cavity, and the opening and closing of the channels between different interfaces on the valve body are controlled by changing the position of the valve core. Common three-way valves include two-position three-way valves or three-position three-way valves, which are generally driven mechanically or electromagnetically to control the movement of the valve core to achieve the purpose of reversing. Taking a two-position three-way solenoid valve as an example, an electromagnet is used to drive one end, and the other end is reset by mechanical force such as a spring.
[0003] However, when the existing solenoid valve is in use, since the valve core is kept in a normally closed state by the elastic stress provided by the elastic component, when the fluid circuit is switched when the magnet drives it to open, the spring is prone to rebound, which may cause inaccurate or delayed fluid control. Utility Model Content
[0004] In order to overcome the shortcomings of the prior art, the utility model provides a normally closed three-way solenoid valve, which arranges a second elastic component between the moving iron and the fixed iron, and the second elastic stress provided by the second elastic component is greater than the first elastic stress of the first elastic component, so that the first elastic component and the second elastic component are always in a compressed state. When the spring is in a compressed state, elastic potential energy is stored inside it, and a stable compressed state can be maintained during the operation of the solenoid valve, thereby avoiding unnecessary rebound, which may cause inaccurate or delayed fluid control. Therefore, avoiding rebound can ensure the reliable and accurate operation of the solenoid valve.
[0005] The purpose of the utility model is achieved by the following technical solutions:
[0006] A normally closed three-way solenoid valve, comprising:
[0007] A valve seat, wherein a valve cavity is provided in the valve seat, a first channel is provided at the bottom end of the valve cavity, a second channel and a third channel are provided at the side of the valve cavity, and the second channel and the third channel are distributed at intervals in the height direction of the valve body;
[0008] A valve core assembly, comprising a valve body, a first valve core, a second valve core and a first elastic component, wherein the valve body is installed in the valve cavity, the valve body is provided with a guide cavity, a first through hole and a second through hole, the first valve core and the second valve core are both installed in the guide cavity and are distributed up and down, the outer wall of the first valve core and the inner wall of the guide cavity are spaced to form a guide interval; the outer wall of the second valve core and the inner wall of the guide cavity are sealed and matched; a guide channel communicating with the first channel is provided inside the second valve core; the first elastic component is connected between the first valve core and the second valve core, and the first elastic component is used to provide a first elastic stress in an upward direction; the first through hole and the second through hole are distributed up and down, the first through hole is passed through to the top of the first valve core and communicated with the guide cavity, and the second channel is located between the first valve core and the second valve core and communicated with the guide cavity;
[0009] A magnet assembly, the magnet assembly includes a fixed iron, a coil group, a moving iron and a second elastic component, the fixed iron and the coil group are fixedly connected to the valve body, the top of the moving iron is connected to the fixed iron through the second elastic component; the second elastic component is used to provide a second downward elastic stress, the second elastic stress is used to provide a force to drive the moving iron away from the fixed iron; the second elastic stress is greater than the first elastic stress, the moving iron is penetrated by the coil group; the bottom end of the moving iron abuts against the first valve core.
[0010] In the first aspect of the utility model, as a preferred embodiment, a first blocking member is provided at the top of the first valve core, and the first blocking member is used to block the end of the flow guiding cavity to block the conduction between the first through hole and the flow guiding interval. Compared with directly blocking with the end of the first valve core, blocking with the first blocking member has a larger sealing surface and a better effect.
[0011] In the first aspect of the utility model, as a preferred embodiment, the first blocking member is made of elastic rubber material. The first blocking member made of elastic rubber material can deform when in contact with the inner wall of the diversion cavity after moving upward, thereby generating a larger sealing surface and achieving a better sealing effect.
[0012] In the first aspect of the utility model, as a preferred embodiment, a second plugging member is provided at the top of the second valve core, the second plugging member is sleeved on the outer periphery of the top of the second valve core, and is used to be deformed by the top pressure of the first valve core to close the guide channel. The second plugging member is deformed to close the guide channel, and a seal is formed on the contact surface of the first valve core and the second valve core, the sealing surface is larger, and the sealing effect is better.
[0013] In the first aspect of the utility model, as a preferred embodiment, the bottom end of the first valve core is provided with a protrusion, and the protrusion is used to press the second blocking member. In this way, the protrusion can form an uneven structure at the bottom end of the first valve core, and the protrusion can be more easily deformed when the second blocking member is pressed after pressing the second blocking member.
[0014] In the first aspect of the present invention, as a preferred embodiment, the second plugging member is made of an elastic rubber material. In this way, the first plugging member made of an elastic rubber material can deform when in contact with the inner wall of the diversion cavity after moving upward, thereby generating a larger sealing surface and achieving a better sealing effect.
[0015] In the first aspect of the utility model, as a preferred embodiment, a guide channel is provided in the valve body, and the movable iron is movably arranged in the guide channel and connected to the first valve core. In this way, the movable iron can slide with the guide channel during movement to achieve stable up and down movement.
[0016] In the first aspect of the present invention, as a preferred embodiment, the first elastic component and the second elastic component are both springs. In this way, the performance of the elastic component is achieved by a spring structure, so that the telescopic performance is better.
[0017] In the first aspect of the utility model, 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, the coil group is wound in the coil seat, the fixed iron is fixedly connected to the top of the coil seat, the moving iron is passed through the coil group and extends from the bottom of the coil seat to connect with the first valve core. The coil group is wound in the coil seat and is located in the coil winding cavity, so that the moving iron can be passed through the coil group in the coil winding cavity, so that the winding space of the coil group is independent and the coil group is not easily affected by other components.
[0018] Compared with the prior art, the beneficial effects of the present invention are:
[0019] The utility model arranges a second elastic component between the moving iron and the fixed iron, and the second elastic stress provided by the second elastic component is greater than the first elastic stress of the first elastic component. The first elastic component and the second elastic component are always in a compressed state. When the spring is in a compressed state, elastic potential energy is stored inside it, and a stable compressed state can be maintained during the operation of the solenoid valve, thereby avoiding unnecessary rebound, which may cause inaccurate or delayed fluid control. Therefore, avoiding rebound can ensure the reliable and accurate operation of the solenoid valve. In addition, the compressed state of the spring helps to reduce system vibration and noise because they can absorb and disperse the impact force caused by changes in fluid pressure or the action of the solenoid valve, which enhances the stability of the entire fluid control system. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a structural schematic diagram of the solenoid valve of the utility model in a power-on state;
[0021] Figure 2 It is a structural schematic diagram of the solenoid valve of the utility model in a power-off state.
[0022] In the figure: 10, valve seat; 11, valve cavity; 12, second channel; 13, third channel; 14, first channel; 20, first valve core; 21, first blocking member; 22, protrusion; 30, second valve core; 31, guide channel; 32, second blocking member; 40, valve body; 41, first through hole; 42, second through hole; 43, guide cavity; 44, guide channel; 50, first elastic component; 60, fixed iron; 70, moving iron; 80, second elastic component; 90, coil seat. DETAILED DESCRIPTION
[0023] Below, in conjunction with the accompanying drawings and specific embodiments, the utility model 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 the 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 cannot be understood as limiting the present application.
[0024] 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.
[0025] 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.
[0026] 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.
[0027] like Figure 1-2 A normally closed three-way solenoid valve shown includes a valve seat 10, a valve core assembly and a magnet assembly, a valve cavity 11 is provided in the valve seat 10, a first channel 14 is provided at the bottom end of the valve cavity 11, a second channel 12 and a third channel 13 are provided on the side of the valve cavity 11, and the second channel 12 and the third channel 13 are distributed at intervals in the height direction of the valve body 40.
[0028] The valve core assembly includes a valve body 40, a first valve core 20, a second valve core 30 and a first elastic component 50. The valve body 40 is installed in the valve cavity 11, and the middle part of the valve body 40 is sealed with the inner wall of the valve cavity 11 through a sealing ring, so that the interior of the valve cavity 11 can be divided into two upper and lower cavity sections, the second channel 12 is connected to the upper cavity section, and the third channel 13 is connected to the lower cavity section.
[0029] Specifically, the valve body 40 is provided with a flow guiding cavity 43, a first through hole 41 and a second through hole 42, and the first valve core 20 and the second valve core 30 are both installed in the flow guiding cavity 43. The first valve core 20 and the second valve core 30 are distributed up and down in the flow guiding cavity 43. The outer wall of the first valve core 20 and the inner wall of the flow guiding cavity 43 are spaced to form a flow guiding interval, and the outer wall of the second valve core 30 and the inner wall of the flow guiding cavity 43 are sealed. A flow guiding channel 31 that penetrates the first channel 14 is provided inside the second valve core 30, and a first elastic component 50 is connected between the first valve core 20 and the second valve core 30. The first elastic component 50 can provide a first elastic stress in an upward direction, and the first elastic stress can drive the first valve core 20 to approach the flow guiding channel 31 so that the flow guiding channel 31 is closed. After the first valve core 20 approaches the flow guiding channel 31 of the second valve core 30, the first through hole 41 can be opened. The first through hole 41 and the second through hole 42 are distributed up and down. The first through hole 41 passes through the top of the first valve core 20 and is connected to the guide cavity 43. The second channel 12 is located between the first valve core 20 and the second valve core 30 and is connected to the guide cavity 43.
[0030] In addition, the magnet assembly includes a fixed iron 60, a coil group, a moving iron 70 and a second elastic component 80, and the fixed iron 60 and the coil group are fixedly connected to the valve body 40. The top end of the moving iron 70 is connected to the fixed iron 60 through the second elastic component 80, and the second elastic component 80 is used to provide a second downward elastic stress, which can drive the moving iron 70 away from the fixed iron 60; the second elastic stress is greater than the first elastic stress; the moving iron 70 is inserted into the coil group; the bottom end of the moving iron 70 is abutted against the first valve core 20.
[0031] On the basis of the above structure, when the normally closed three-way valve of the utility model is used, when the coil group is not energized, the second elastic stress provided by the second elastic component 80 can drive the first valve core 20 downward to approach the guide channel 31 of the second valve core 30, so that the guide channel 31 of the second valve core 30 can be closed, and the first through hole 41 of the guide cavity 43 can be opened to communicate with the guide interval. At this time, the third channel 13 can introduce fluid, and the fluid enters the guide cavity 43 through the second through hole 42. At this time, the guide channel 31 is closed, and the fluid entering the guide cavity 43 can enter the first through hole 41 through the guide interval, and enter the upper cavity section of the valve cavity 11 through the first through hole 41, and then be exported through the second channel 12, so that the fluid circuit is the third channel 13, the second through hole 42, the guide interval and the second channel 12.
[0032] After the coil group is energized, the moving iron 70 is magnetized, and the generated magnetic force can drive the moving iron 70 to move upward, overcoming the second elastic stress provided by the second elastic component 80. At the same time, after the moving iron 70 moves upward, the force on the first elastic component 50 disappears, and it gradually returns to its compressed state to provide an upward spring force, driving the first valve core 20 to move upward. The first valve core 20 moves upward to move away from the guide channel 31 of the second valve core 30. The first valve core 20 closes the first through hole 41. At this time, the third channel 13 introduces fluid, and the fluid enters through the cavity section located below the valve cavity 11, and is introduced into the guide cavity 43 through the second through hole 42, and then is discharged through the guide channel 31 of the second valve core 30. The fluid circuit is realized by the third channel 13, the second through hole 42, the guide channel 31 and the first channel 14.
[0033] In this way, the first elastic component and the second elastic component of the present embodiment are designed to be always in a compressed state. When the spring is in a compressed state, elastic potential energy is stored inside it, and a stable compressed state can be maintained during the operation of the solenoid valve, thereby avoiding unnecessary rebound, which may cause inaccurate or delayed fluid control. Therefore, avoiding rebound can ensure the reliable and accurate operation of the solenoid valve. In addition, the compressed state of the spring helps to reduce system vibration and noise because they can absorb and disperse the impact force caused by changes in fluid pressure or the action of the solenoid valve, which enhances the stability of the entire fluid control system.
[0034] Furthermore, a first blocking member 21 is provided at the top of the first valve core 20. When the first valve core 20 moves upward, the first blocking member 21 of the first valve core 20 can be closed at a position between the top of the guide cavity 43 and the first through hole 41, so that the first blocking member can block the connection between the first through hole 41 and the guide interval. Compared with directly blocking with the end of the first valve core 20, blocking with the first blocking member 21 has a larger sealing surface and a better effect.
[0035] In this embodiment, the first blocking member 21 is made of elastic rubber material. In this way, the first blocking member 21 made of elastic rubber material can be deformed when in contact with the inner wall of the guide cavity 43 after moving upward, thereby generating a larger sealing surface and achieving a better sealing effect.
[0036] Furthermore, a second blocking member 32 can be provided at the top of the second valve core 30, and the second blocking member 32 can be mounted on the outer periphery of the top of the second valve core 30. In this way, when the first valve core 20 moves downward close to the guide channel 31 of the second valve core 30, the first valve core 20 can contact the second blocking member 32 at the top of the second valve core 30. In this way, the first valve core 20 can press the second blocking member 32, so that the second blocking member 32 is deformed to close the guide channel 31, and a seal is formed on the contact surface of the first valve core 20 and the second valve core 30, so that the sealing surface is larger and the sealing effect is better.
[0037] Furthermore, a protrusion 22 is provided at the bottom end of the first valve core 20, so that when the first valve core 20 moves downward, the protrusion 22 protruding from the first valve core 20 can press the second sealing member 32, and the protrusion 22 can form an uneven structure at the bottom end of the first valve core 20. After pressing the second sealing member 32, the protrusion 22 can be more easily deformed when it is against the second sealing member 32.
[0038] Furthermore, the second blocking member 32 is made of elastic rubber material.
[0039] The elastic glue in this embodiment can be made of materials such as rubber, silicone, etc. in the prior art that can deform after being compressed.
[0040] In order to improve the movement stability of the moving iron 70, a guide channel 44 can be further provided in the valve body 40. The moving iron 70 can be movably inserted into the guide channel 44 and connected to the first valve core 20, so that the moving iron 70 can slide and cooperate with the guide channel 44 during movement to achieve stable up and down movement.
[0041] Further, the first elastic component 50 and the second elastic component 80 are both springs, and the performance of the elastic component is achieved by a spring structure, so that the telescopic performance is better. Further, the magnet assembly also includes a coil seat 90, the coil seat 90 is fixed to the top of the valve seat 10, the coil group is wound in the coil seat 90, the fixed iron 60 is fixed to the top of the coil seat 90, and the moving iron 70 is passed through the coil group and extends from the bottom of the coil seat 90 to connect with the first valve core 20. A coil winding cavity can be set in the coil seat 90, and the coil group is wound in the coil seat 90 and located in the coil winding cavity, so that the moving iron 70 can be passed through the coil group in the coil winding cavity, so that the winding space of the coil group is independent, and the coil group is not easily affected by other components.
[0042] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.
Claims
1. A normally closed three-way solenoid valve, characterized in that: include, A valve seat, wherein a valve cavity is provided in the valve seat, a first channel is provided at the bottom end of the valve cavity, and a second channel and a third channel are provided at the side of the valve cavity; A valve core assembly, comprising a valve body, a first valve core, a second valve core and a first elastic component, wherein the valve body is installed in the valve cavity, the valve body is provided with a guide cavity, a first through hole and a second through hole, the first valve core and the second valve core are both installed in the guide cavity and are distributed up and down, the outer wall of the first valve core and the inner wall of the guide cavity are spaced to form a guide interval; the outer wall of the second valve core and the inner wall of the guide cavity are sealed and matched; a guide channel communicating with the first channel is provided inside the second valve core; the first elastic component is connected between the first valve core and the second valve core, and the first elastic component is used to provide a first elastic stress in an upward direction; the first through hole and the second through hole are distributed up and down, the first through hole is passed through to the top of the first valve core and communicated with the guide cavity, and the second channel is located between the first valve core and the second valve core and communicated with the guide cavity; The second channel and the third channel are spaced apart in the height direction of the valve body; A magnet assembly, the magnet assembly includes a fixed iron, a coil group, a moving iron and a second elastic component, the fixed iron and the coil group are fixedly connected to the valve body, the top of the moving iron is connected to the fixed iron through the second elastic component; the second elastic component is used to provide a second downward elastic stress, the second elastic stress is used to provide a force to drive the moving iron away from the fixed iron; the second elastic stress is greater than the first elastic stress, the moving iron is penetrated by the coil group; the bottom end of the moving iron abuts against the first valve core.
2. The normally closed three-way solenoid valve according to claim 1, characterized in that: A first blocking member is disposed at the top end of the first valve core, and the first blocking member is used to block the end of the flow guiding cavity to block the conduction between the first through hole and the flow guiding interval.
3. The normally closed three-way solenoid valve according to claim 2, characterized in that: The first blocking member is made of elastic rubber material.
4. The normally closed three-way solenoid valve according to claim 1, characterized in that: A second blocking member is provided at the top end of the second valve core. The second blocking member is sleeved on the outer periphery of the top end of the second valve core and is used to deform under the top pressure of the first valve core to close the guide channel.
5. The normally closed three-way solenoid valve according to claim 4, characterized in that: A protrusion is provided at the bottom end of the first valve core, and the protrusion is used to press the second blocking member.
6. The normally closed three-way solenoid valve according to claim 4, characterized in that: The second blocking member is made of elastic rubber material.
7. The normally closed three-way solenoid valve according to any one of claims 1 to 6, characterized in that: A guide channel is provided in the valve body, and the movable iron is movably arranged in the guide channel and connected to the first valve core.
8. The normally closed three-way solenoid valve according to any one of claims 1 to 6, characterized in that: The first elastic component and the second elastic component are both springs.
9. The normally closed three-way solenoid valve according to any one of claims 1 to 6, characterized in that: The magnet assembly also includes a coil seat, which is fixedly connected to the top of the valve seat. The coil group is wound inside the coil seat. The fixed iron is fixedly connected to the top of the coil seat. The moving iron passes through the coil group and extends from the bottom of the coil seat to connect with the first valve core.