Normally-closed three-way electromagnetic valve

Abstract

Disclosed in the present utility model is a normally-closed three-way electromagnetic valve, which comprises: a valve seat, a valve cavity being formed in the valve seat, a first channel being formed in the bottom end of the valve cavity, and a second channel and a third channel being formed in the side portion of the valve cavity; a valve element assembly, which comprises a valve body, a first valve element, a second valve element and a first elastic component, the valve body being provided with a flow guide cavity, a first through hole and a second through hole, the outer wall of the first valve element and the inner wall of the flow guide cavity being spaced apart to form a flow guide gap, a flow guide channel communicated with the first channel being formed in the second valve element, and the first elastic component being connected between the first valve element and the second valve element; and a magnet assembly, which comprises a stationary core, a coil group, an armature and a second elastic component, the top end of the armature being connected to the stationary core by means of the second elastic component, and the bottom end of the armature abutting against the first valve element. In the present utility model, providing the second elastic component between the armature and the stationary core prevents spring rebound, thereby ensuring reliable and accurate operation of the electromagnetic valve.

Description

A normally closed three-way solenoid valve Technical Field

[0001] The utility model relates to electromagnetic valve technology, in particular to a normally closed three-way electromagnetic valve. Background Art

[0002] Currently, three-way valves are widely used in hydraulic and pneumatic control systems. Their main structure consists of a valve body with three fluid interfaces, a valve chamber connecting these interfaces, and a movable valve core within the valve chamber. Changing the position of the valve core controls the flow of fluid between the different interfaces on the valve body. Common three-way valves include two-position three-way valves and three-position three-way valves. They generally use mechanical or electromagnetic actuation to control the movement of the valve core and achieve switching. For example, a two-position three-way solenoid valve uses an electromagnet at one end to drive the valve, while the other end is reset by a mechanical force such as a spring.

[0003] However, when the existing solenoid valve is in use, since the valve core is kept in the normally closed state by the elastic stress provided by the elastic component, when the fluid circuit is switched when the magnet drives it open, the spring is prone to rebound, which may cause inaccurate or delayed fluid control.

[0004] Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, the present invention provides a normally closed three-way solenoid valve, which is provided with 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, which can maintain a stable compressed state during the operation of the solenoid valve, thereby avoiding unnecessary rebound. Rebound may cause inaccurate or delayed fluid control. Therefore, avoiding rebound can ensure the reliable and accurate operation of the solenoid valve. The purpose of the present invention 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 spaced apart in the height direction of the valve body;

[0008] A valve core assembly includes a valve body, a first valve core, a second valve core, and a first elastic component. 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 apart to form a guide gap. 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 upward elastic stress. The first through hole and the second through hole are distributed up and down. The first through hole passes through to the top of the first valve core and communicates with the guide cavity. The second channel is located between the first valve core and the second valve core and communicates 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 passed through the coil group; the bottom end of the moving iron abuts against the first valve core.

[0010] In the first aspect of the present invention, as a preferred embodiment, a first sealing member is provided at the top end of the first valve core. The first sealing member is used to seal the end of the diversion cavity to block the flow between the first through hole and the diversion space. Compared with directly sealing with the end of the first valve core, using the first sealing member to achieve blocking and blocking provides a larger sealing surface and a better sealing effect.

[0011] In the first aspect of the present invention, as a preferred embodiment, the first sealing member is made of an elastic rubber material. The first sealing member made of the elastic rubber material can deform upon contact with the inner wall of the diversion cavity after upward movement, thereby generating a larger sealing surface and achieving a better sealing effect.

[0012] In the first aspect of the present invention, as a preferred embodiment, a second sealing member is provided at the top end of the second valve core. The second sealing member is fitted around the outer periphery of the top end of the second valve core and is configured to deform under the pressure of the first valve core to close the diversion channel. Deformation of the second sealing member seals the diversion channel, forming a seal at the contact surface between the first and second valve cores, resulting in a larger sealing surface and a better sealing effect.

[0013] In the first aspect of the present invention, as a preferred embodiment, a protrusion is provided at the bottom end of the first valve core, and the protrusion is used to press against the second blocking member. Thus, the protrusion can form an uneven structure at the bottom end of the first valve core, and after pressing against the second blocking member, the protrusion can more easily deform when the second blocking member is pressed.

[0014] In the first aspect of the present invention, as a preferred embodiment, the second sealing member is made of an elastic rubber material. Thus, the first sealing member made of an elastic rubber material can deform upon contact with the inner wall of the diversion cavity after upward movement, thereby creating a larger sealing surface and achieving a better sealing effect.

[0015] In the first aspect of the present invention, as a preferred embodiment, a guide channel is provided in the valve body, and the movable iron is movably provided in the guide channel and connected to the first valve core. In this way, the movable iron can slide in 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 using a spring structure, so that the telescopic performance is better.

[0017] In the first aspect of the present invention, as a preferred embodiment, the magnet assembly further comprises a coil seat, the coil seat being fixedly connected to the top of the valve seat, the coil assembly being wound within the coil seat, the fixed iron being fixedly connected to the top of the coil seat, and the moving iron being passed through the coil assembly and extending from the bottom of the coil seat to connect with the first valve core. The coil assembly is wound within the coil seat and positioned within the coil winding cavity, so that the moving iron can be passed through the coil assembly within the coil winding cavity. This provides an independent winding space for the coil assembly, making it less susceptible to being 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] FIG1 is a schematic structural diagram of the solenoid valve of the present invention in a power-on state;

[0021] FIG2 is a schematic structural diagram of the solenoid valve of the present invention 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. Unless otherwise specified, 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 numbers 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 this application, and cannot be understood as limiting this application.

[0024] In the description of this application, it should be understood that the terms "upper," "lower," "front," "back," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting this application. In the description of this application, "plurality" means two or more, unless otherwise specifically specified.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "connected," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, a connection through an intermediary medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0026] The terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or sequential sequence. In addition, the terms "including," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to the process, method, product, or apparatus.

[0027] A normally closed three-way solenoid valve as shown in Figure 1-2 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, and 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 spaced apart 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 above-mentioned 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 cavity section located above, and the third channel 13 is connected to the cavity section located below.

[0029] Specifically, the valve body 40 is provided with a flow guide cavity 43, a first through hole 41, and a second through hole 42. The first valve core 20 and the second valve core 30 are both installed in the flow guide cavity 43. The first valve core 20 and the second valve core 30 are distributed vertically in the flow guide cavity 43. The outer wall of the first valve core 20 and the inner wall of the flow guide cavity 43 form a flow guide gap, and the outer wall of the second valve core 30 and the inner wall of the flow guide cavity 43 are sealed. A flow guide channel 31 is provided inside the second valve core 30 and is connected to the first channel 14. 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 upward elastic stress. The first elastic stress can drive the first valve core 20 to approach the flow guide channel 31 to close the flow guide channel 31. After the first valve core 20 approaches the flow guide 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 to 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, which fix the fixed iron 60 and the coil group to the valve body 40. The top 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 downward second 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 present invention 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 discharged 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 upward movement of the first valve core 20 can 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 this 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, which can maintain a stable compressed state during the operation of the solenoid valve, thereby avoiding unnecessary rebound. Rebound 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 communication between the first through hole 41 and the guide interval. Compared with directly blocking with the end of the first valve core 20, the blocking and sealing is achieved by the first blocking member 21, and the sealing surface is larger and the effect is better.

[0035] In this embodiment, the first sealing member 21 is made of elastic rubber material. In this way, the first sealing 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 a better sealing effect.

[0036] Furthermore, a second blocking member 32 may be provided at the top of the second valve core 30, and the second blocking member 32 may be sleeved on the outer periphery of the top of the second valve core 30. In this way, when the first valve core 20 moves downward and approaches the guide channel 31 of the second valve core 30, the first valve core 20 may contact the second blocking member 32 at the top of the second valve core 30. In this way, the first valve core 20 may press the second blocking member 32, so that the second blocking member 32 may be deformed to close the guide channel 31, and a seal is formed on the contact surface between the first valve core 20 and the second valve core 30, with a larger sealing surface and a better sealing effect.

[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 in contact with the second sealing member 32.

[0038] Furthermore, the second blocking member 32 is made of elastic rubber material.

[0039] The elastic adhesive in this embodiment can be made of materials such as rubber, silicone, etc. in the prior art that can be deformed 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 is movably arranged in the guide channel 44 and connected to the first valve core 20. In this way, the moving iron 70 can slide and cooperate with the guide channel 44 when moving to achieve stable up and down movement.

[0041] Furthermore, 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 elastic performance is better. Furthermore, 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 end of the coil seat 90 to connect with the first valve core 20. A coil winding cavity can be provided in the coil seat 90, and the coil group is wound in the coil seat 90 and located in the coil winding cavity. In this way, the moving iron 70 can be passed through the coil group in the coil winding cavity. In this way, the winding space of the coil group is independent and the coil group is not easily affected by other components.

[0042] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention 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, 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 spaced apart in the height direction of the valve body; A valve core assembly includes a valve body, a first valve core, a second valve core, and a first elastic component. 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 apart to form a guide gap. 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 upward elastic stress. The first through hole and the second through hole are distributed up and down. The first through hole passes through to the top of the first valve core and communicates with the guide cavity. The second channel is located between the first valve core and the second valve core and communicates with the guide cavity. 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 passed through the coil group; the bottom end of the moving iron abuts against the first valve core.

2. The normally closed three-way valve according to claim 1, characterized in that: A first blocking member is provided at the top end of the first valve core, and the first blocking member is used to block the end of the guide cavity to block the communication between the first through hole and the guide interval.

3. The normally closed three-way valve according to claim 2, characterized in that: The first blocking member is made of elastic rubber material.

4. The normally closed three-way 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 be deformed by the top pressure of the first valve core to close the guide channel.

5. The normally closed three-way 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 valve according to claim 4, characterized in that: The second blocking member is made of elastic rubber material.

7. The normally closed three-way 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 is connected to the first valve core.

8. The normally closed three-way 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 valve according to any one of claims 1 to 6, characterized in that: The magnet assembly also includes a coil seat, which is fixed to the top of the valve seat. The coil group is wound in the coil seat. The fixed iron is fixed to the top of the coil seat. The moving iron passes through the coil group and extends from the bottom end of the coil seat to connect with the first valve core.

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