A silent solenoid valve

Abstract

The present invention relates to a silent electromagnetic valve, comprising a coil frame, a first permanent magnet, a second permanent magnet, an armature and a coil wound on the coil frame, wherein the coil frame has a mounting hole opened along the axial direction of the annular excitation coil, the armature is slidably arranged in the mounting hole and has a sliding stroke in a first direction and a second direction diverging from each other, a first elastic body and a second elastic body are respectively provided in the first direction and the second direction of the armature to buffer the sliding stroke of the armature, the armature has a static stable position in the first direction and the second direction, and further comprises a push rod and a push rod reset member, when the armature slides in the second direction, the second elastic reset element in the second direction is pushed to push the push rod to move in the second direction, when the armature slides in the first direction, the push rod reset member can abut on the push rod and push the push rod to move in the first direction. The electromagnetic valve provided by the present invention has a significant silent effect, a small size and low energy consumption.

Description

Technical Field

[0001] The invention relates to a silent electromagnetic valve. Background Art

[0002] Solenoid valves are basic components for controlling fluid automation, and are used to adjust the direction, flow, speed and other parameters of the medium in the control system. Common solenoid valves generally have components such as a static iron core and a moving iron core. For example, a miniature high-efficiency DC bistable pulse solenoid valve provided by the inventor in the utility model patent with patent number CN200958626Y uses current applied to the excitation coil to generate magnetic force between the static iron core and the moving iron core, adsorbing the moving iron core to move in the direction of the static iron core. One end of the moving iron core is usually equipped with a valve plug. When the moving iron core moves, it drives the valve plug to move and then block or unblock the valve to control the opening and closing of the valve. In this process, because the working mode of the static iron core adsorbing the moving iron core is adopted, when the moving iron core moves in the direction of the static iron core, it will eventually hit the static iron core to stop the movement of the moving iron core, and the solenoid valve will generate noise during the sudden impact and stop process, and the kinetic energy of the moving iron core is converted into energy in the form of iron core deformation and sound waves. Solenoid valves are widely used. For example, when solenoid valves are used in bathrooms and other fields, the noise generated by the solenoid valves will affect the user experience. Foreign standards in the bathroom industry, especially EU standards, have extremely strict requirements on noise. The noise of the electromagnet in the solenoid valve has been a chronic disease and obstacle in the bathroom industry for many years, and has always affected the export trade of Chinese products. Summary of the invention

[0003] Therefore, in view of the above problems, the present invention proposes a silent solenoid valve.

[0004] The present invention is implemented by the following technical solutions:

[0005] The present invention proposes a silent solenoid valve, comprising a coil frame, an armature and a coil wound on the coil frame, wherein the coil frame has a mounting hole opened along the axial direction of the coil, the armature can be slidably arranged in the mounting hole, and further comprises a first permanent magnet and a second permanent magnet, the first permanent magnet and the second permanent magnet are roughly arranged at both ends of the armature, and both can generate magnetic force on the armature, under the excitation of the coil, the first permanent magnet and the second permanent magnet increase and decrease the magnetic force on the armature, so that the armature has a sliding stroke in a first direction and a second direction that deviate from each other under the action of the magnetic force, and a first permanent magnet is respectively provided in the first direction and the second direction of the armature to buffer the sliding stroke of the armature elastomer and a second elastomer, the armature has a static stable position in the first direction and the second direction respectively. When the armature is in the static stable position, the magnetic force generated by the first permanent magnet and the second permanent magnet which are not excited by the coil can make the armature reach a state of force balance, and also includes a push rod and a push rod reset member. The push rod and the armature are roughly arranged on the same axis. When the armature slides in the second direction, it pushes the second elastomer in the second direction, and then the second elastomer pushes the push rod to move in the second direction. The push rod reset member is connected to the armature. When the armature slides in the first direction, the push rod reset member can contact the push rod and push the push rod to move in the first direction.

[0006] In order to save space, reduce the volume of the electromagnetic valve, transmit the thrust of the armature and absorb the deflection of the head, the armature and the push rod are sleeved, and the second elastic body is arranged between the armature and the push rod.

[0007] In order to save space and reduce the volume of the solenoid valve, the armature has a blind hole opened along a first direction, the aperture of the blind hole is larger than the maximum outer diameter of the push rod, the push rod has a first end and a second end that are opposite to each other, the push rod extends into the blind hole with its first end, and the second end of the push rod is exposed outside the blind hole, one end of the second elastomer is in contact with the push rod, and the other end is in contact with the bottom of the blind hole.

[0008] Among them, based on installation and manufacturing considerations, the second elastomer is sleeved on the push rod, and the push rod has a first step for the second elastomer to abut against. When the armature slides in the first direction, the push rod reset member can abut against the first step of the push rod and push the push rod to move in the first direction.

[0009] In order to provide buffering and evenly transmit the thrust of the armature and absorb the deflection of the head, the second elastic body is a compression spring or a rubber elastic body.

[0010] Among them, based on installation and manufacturing considerations, the push rod reset member is an end cover sleeved on the second end of the push rod and connected to the blind hole opening of the armature, and the push rod has a second step for the end cover to abut.

[0011] Among them, in order to install the first elastomer, it also includes a mounting seat, which is arranged at one end of the mounting hole, and the other end of the mounting hole is open. The armature extends into the mounting hole from the opening of the mounting hole. The first elastomer is installed in the mounting hole, and one end of the first elastomer rests on the mounting seat, and the other end rests on the armature.

[0012] In order to provide buffering and absorb the deflection of the head, the first elastic body is a compression spring or a rubber elastic body.

[0013] To better install the first elastomer, the first elastomer is sleeved on a mounting seat having a columnar structure for the first elastomer to sleeve on, and one end of the armature in the first direction has a clearance hole for accommodating the columnar structure of the mounting seat.

[0014] In order to achieve the blocking effect on the valve, one end of the push rod in the second direction is connected to a water sealing plug.

[0015] The present invention has the following beneficial effects: the silent solenoid valve provided by the present invention does not have a static iron core, and the armature is used to drive the movement of the push rod to realize the control of the valve, and elastic bodies are provided at both ends of the main moving part armature to buffer the movement of the armature and the push rod, and can also transfer energy relatively smoothly, so that the armature can apply force evenly to transfer force to the push rod, and since there is no process of the moving iron hitting the static iron, the silent effect is significant. In addition, the silent solenoid valve provided by the present invention is small in size and low in energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is an overall schematic diagram of the silent solenoid valve in the embodiment;

[0017] Figure 2 Schematic diagram of the coil skeleton in the embodiment;

[0018] Figure 3 is a schematic diagram of a spring seat in an embodiment;

[0019] Figure 4 is a schematic diagram of an armature in an embodiment;

[0020] Figure 5 is a schematic diagram of a push rod in an embodiment;

[0021] Figure 6 is a schematic diagram of an end cap in an embodiment;

[0022] Figure 7 yes Figure 6 Sectional view at AA in the middle;

[0023] Figure 8 is a schematic diagram of the silent solenoid valve in the closed state in the embodiment;

[0024] Fig. 9Schematic diagram of the silent solenoid valve in the open state in the embodiment. DETAILED DESCRIPTION

[0025] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0026] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0027] See also Figure 1-Figure 9 As shown, as a preferred embodiment of the present invention, a silent solenoid valve is provided, which can be used in the field of faucets to control the opening and closing of water flow channels. The silent solenoid valve includes a coil frame 1, a coil 2, a spring seat 3, a first permanent magnet 4, a second permanent magnet 5, an armature 6, a push rod 7, a first spring 8, a second spring 9, a water sealing plug 10, a water sealing rubber 11 and an end cover 12, etc. Figure 1 and Figure 2 The coil frame 1 is a rotating body with a cross section roughly in the shape of an "I" character. The coil frame 1 has an outer groove 101, a first annular groove 102 and a second annular groove 103 arranged at both ends of the coil frame 1, and a center hole 104. The coil 2 is wound in the outer groove 101 of the coil frame 1, the first permanent magnet 4 and the second permanent magnet 5 are respectively installed in the first annular groove 102 and the second annular groove 103, and the armature 6, the push rod 7, the first spring 8, the second spring 9 and the water-sealing plug 10 are installed in the center hole 104. Definition Figure 1 In the illustrated position, the first permanent magnet 4 is on the left relative to the second permanent magnet 5, and the second permanent magnet 5 is on the right relative to the first permanent magnet 4. The spring seat 3 is also installed in the first annular groove 102, see Figure 3As shown, the spring seat 3 is a rotating body, including a base 301 for installing and positioning the spring seat 3 in the first annular groove 102, and a boss 302 protruding outward at the center of the base 301. The spring seat 3 has a third annular groove 303 roughly at the connection between the boss 302 and the base 301. When the spring seat 3 is installed in the first annular groove 102, the boss 302 is installed in the direction of the center hole 104. After the installation is completed, the boss 302 is located in the center hole 104, and the base 301 is kept flush with the left end surface of the coil skeleton 1. The first permanent magnet 4, the second permanent magnet 5 and the spring seat 3 can be installed on the coil skeleton 1 in a variety of ways such as screw connection, clamping, bonding, etc. For example, in this embodiment, the first permanent magnet 4, the second permanent magnet 5 and the spring seat 3 are fixedly installed by bonding. The spring seat 3 may be an independent component as in the present embodiment, but may also be integrally formed with the coil frame 1. In this structure, the first permanent magnet 4 needs to be arranged on other parts such as the outer end surface of the coil frame 1. In the present embodiment, preferably, the coil 2 is an annular excitation coil, and the center hole 104 is opened roughly along the axial direction of the coil 2 to improve the accuracy of the movement of the armature 6 in the center hole 104. However, in other embodiments, the coil 2 may also be in other shapes such as a square.

[0028] The armature 6, the push rod 7, the first spring 8, the second spring 9 and the water sealing plug 10 are all installed in the central hole 104. Figure 4 The armature 6 is a cylindrical rotating body, and has a first blind hole 61 with a shallow depth and an opening on the left side and a second blind hole 62 with a deep depth and an opening on the right side. The second blind hole 62 has an internal thread 63 at the opening position. Figure 1 The diameter of the first blind hole 61 is slightly larger than the diameter of the boss 302, so that the boss 302 can extend into the first blind hole 61 (that is, the first blind hole 61 makes way for the boss 302), the first spring 8 is sleeved on the boss 302, the left end of the first spring 8 abuts against the bottom of the third annular groove 303 (that is, the base 301), and the right end of the first spring 8 abuts against the left end surface of the armature 6, so that the armature 6 can slide left and right relative to the spring seat 3. The provision of the boss 302 can better fit the first spring 8. In other embodiments, the boss 302 may not be provided, and the first spring 8 can be directly abutted against the base 301 of the spring seat 3.

[0029] See also Figure 5 As shown, the push rod 7 is generally a stepped shaft in appearance, including a first shaft section 71, a second shaft section 72 and a third shaft section 73. The shaft diameter of the second shaft section 72 is larger than the shaft diameters of the first shaft section 71 and the third shaft section 73. The shaft shoulders formed by the second shaft section 72, the first shaft section 71 and the third shaft section 73 are defined as the first step section 74 and the second step section 75 respectively. The third shaft section 73 is further provided with a third blind hole 76 at one end (the right end in the figure) away from the second step section 75. Figure 1 As shown, the push rod 7 extends into the second blind hole 62 of the armature 6 (the shaft diameter of the second shaft section 72 is slightly smaller than the hole diameter of the second blind hole 62). The second spring 9 is sleeved on the first shaft section 71, and the left end of the second spring 9 abuts against the bottom of the second blind hole 62 (that is, the solid part between the first blind hole 61 and the second blind hole 62 in the body of the armature 6), and the right end of the second spring 9 abuts against the first step section 74, so that the push rod 7 can slide left and right relative to the armature 6. The third blind hole 76 is used to install the water-sealing plug 10, which can be screwed, bonded, clamped, etc., for example, screwed in this embodiment. The water-sealing plug 10 is coated with a layer of water-sealing rubber 11 to enhance the sealing ability of blocking the water flow channel.

[0030] In this embodiment, the first permanent magnet 4 and the second permanent magnet 5 are both made of neodymium iron boron permanent magnet material; in this embodiment, the installation method of sleeve-connecting the armature 6 on the push rod 7 is selected, but in other embodiments, the push rod 7 can also be sleeved on the armature 6 conversely, and based on the technology provided in this embodiment, technicians in this field can easily make adaptive adjustments in the structure; in this embodiment, the first spring 8 and the second spring 9 are compression springs, but in other embodiments, other elastomers, such as rubber elastomers, can also be selected.

[0031] The end cap 12 is a T-shaped cross section. Figure 6 and Figure 7 As shown, the end cover 12 has a central hole 121 that matches the third shaft section 73, and the end cover 12 also has an external thread 122 that matches the internal thread 63. Figure 1 The end cover 12 is sleeved on the third shaft section 73 , and its external thread 122 is screwed with the internal thread 63 , so that the end cover 12 is fixed to the right end of the armature 6 .

[0032] Figure 8 and Fig. 9 The silent solenoid valve is shown in the closing valve ( Figure 8 ) and valve opening ( Fig. 9 ) two states, the working modes of this silent solenoid valve are as follows:

[0033] 1. Valve closing status: see Figure 8 In the valve closing state, the armature 6 is closer to the second permanent magnet 5 on the right side and relatively far away from the first permanent magnet 4 on the left side. The second permanent magnet 5 has a stronger suction force on the armature 6, which attracts the armature 6 to move rightward. The armature 6 compresses the second spring 9 while moving rightward, and the force is evenly transmitted to the push rod 7 through the second spring 9, and the push rod 7 is pushed to the right, so that the water sealing plug 10 and the water sealing rubber 11 connected to the push rod 7 are pressed to the right to block the water flow channel 200 (at Figure 8The water flow channel 200 is shown in the figure for illustration and convenience of description. As an application scenario, reference may be made to the utility model patent of the inventor with patent number CN200958626Y).

[0034] 2. From closed valve state to open valve state: refer to Figure 8 and Fig. 9 In the valve closing state, a positive voltage pulse is applied to the coil 2, so that the coil 2 generates a magnetic field that is added to the first permanent magnet 4 and subtracted from the second permanent magnet 5. At this time, the suction force of the first permanent magnet 4 on the armature 6 increases, and the suction force of the second permanent magnet 5 on the armature 6 decreases (or disappears). On the one hand, since the suction force of the first permanent magnet 4 on the armature 6 is greater than the suction force of the second permanent magnet 5 on the armature 6, the armature 6 will move to the left under the adsorption force of the first permanent magnet 4. On the other hand, since the suction force of the first permanent magnet 4 on the armature 6 is greater than the suction force of the second permanent magnet 5 on the armature 6, the suction force to the right that originally resisted the elastic restoring force of the second spring 9 disappears, and the second spring 9 simultaneously pushes the armature 6 to move to the left with its elastic restoring force (since the right end of the push rod 7 has been against the blocked water flow channel, the originally compressed second spring 9 generates an elastic restoring force to the left). When the armature 6 moves to the left, the first spring 8 is compressed to buffer the movement. During the movement of the armature 6 to the left, the end cap 12 connected to the armature 6 also moves to the left, and finally the left end face of the end cap 12 contacts the second step section 75, thereby causing the end cap 12 to drive the push rod 7 to move to the left, so that the water-sealing plug 10 and the water-sealing rubber 11 connected to the push rod 7 no longer block the water flow channel 200. When the combined force of the first permanent magnet 4 and the second permanent magnet 5 on the armature 6 is equal to the elastic restoring force of the first spring 8, the force balance is achieved and the armature 6 stops moving. At this time, since the armature 6 has moved to the left side, even if the coil 2 is not energized at this time, the suction force of the first permanent magnet 4 on the armature 6 will be greater than the suction force of the second permanent magnet 5 on the armature 6, so that the armature 6 is stabilized at the left side and the force balance is achieved.

[0035] 3. Open valve status: see Fig. 9 After moving from the valve closing state to the valve opening state, there is no need to energize the coil 2, the armature 6 remains stable at the left side, and the water sealing plug 10 and the water sealing rubber 11 on the push rod 7 driven by the armature 6 no longer block the water flow channel 200.

[0036] 4. From open valve state to closed valve state: refer to Figure 8 and Fig. 9, in the valve open state, a negative voltage pulse is applied to the coil 2, so that the coil 2 generates a magnetic field that is added to the second permanent magnet 5 and subtracted from the first permanent magnet 4. At this time, the suction force of the second permanent magnet 5 on the armature 6 increases, and the suction force of the first permanent magnet 4 on the armature 6 decreases (or disappears). At this time, the suction force of the second permanent magnet 5 on the armature 6 is relatively strong, and the armature 6 is adsorbed to move to the right. While the armature 6 moves to the right, the second spring 9 is compressed, and the force is evenly transmitted to the push rod 7 through the second spring 9, and the push rod 7 is pushed to the right, so that the water-sealing plug 10 and the water-sealing rubber 11 connected to the push rod 7 are pressed against the right to block the water flow channel 200. Even if the coil 2 is not energized at this time, the suction force of the second permanent magnet 5 on the armature 6 will be greater than the suction force of the first permanent magnet 4 on the armature 6, so that the armature 6 is stabilized in a position close to the right, achieving force balance and pressing against the water flow channel. In this way, a working cycle is completed.

[0037] In the closed valve state ( Figure 8 ), since the first spring 8 needs to resist both the suction force of the first permanent magnet 4 on the armature 6 and the elastic restoring force of the second spring 9 to the left, the elastic coefficient of the first spring 8 will be greater than the elastic coefficient of the second spring 9.

[0038] In this embodiment, the directions of "left" and "right" are shown in the figure to facilitate the explanation of the scheme, but it is obvious that the silent solenoid valve provided in this embodiment is not limited by the installation and placement direction.

[0039] This embodiment exemplarily applies the silent solenoid valve in the field of faucets to control the opening and closing of a water flow channel to illustrate the characteristics of the silent solenoid valve. However, the silent solenoid valve provided in this embodiment can also be applied to control other fluids, such as gas.

[0040] The biggest feature of the silent solenoid valve provided in this embodiment is that it does not have a static iron core, and the armature 6 is used to drive the movement of the push rod 7 to achieve valve control, and a first spring 8 and a second spring 9 are provided at both ends of the main moving component armature 6. The first spring 8 and the second spring 9 can be used to buffer the movement of the armature 6 and the push rod 7, and can also transfer energy relatively smoothly, so that the armature 6 can apply force evenly to transfer force to the push rod 7 to avoid noise. In addition, arranging the push rod 7 in the second blind hole 62 helps to reduce the overall volume of the solenoid valve, and the working mode that only requires instantaneous pulse current also reduces the energy consumption of the solenoid valve.

[0041] Although the left end face of the end cover 12 will contact the second step section 75 during the valve opening process, due to the presence of the first spring 8 and the second spring 9, the movement of the armature 6 is gentle, and there will not be a violent (rigid) collision between the static iron core and the moving iron core in the old solution. Therefore, the sound of the end cover 12 contacting the second step section 75 is very small, and the impact is very low. In addition, it is also preferred to provide a flexible material (such as bonding a layer of rubber) on the left end face of the end cover 12 (or on the second step section 75), and the end cover 12 itself can also be made of a plastic material with a slightly lower hardness to reduce the impact of the contact between the end cover 12 and the second step section 75.

[0042] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes in form and details made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims will fall within the scope of protection of the present invention.

Claims

1. A silent solenoid valve, comprising a coil frame, an armature and a coil wound on the coil frame, wherein the coil frame has a mounting hole opened along the axial direction of the coil, and the armature is slidably arranged in the mounting hole, characterized in that: It also includes a first permanent magnet and a second permanent magnet, which are arranged at both ends of the armature and can both generate magnetic force on the armature. Under the excitation of the coil, the magnetic force of the first permanent magnet and the second permanent magnet on the armature increases and decreases, so that the armature has a sliding stroke in the first direction and the second direction that deviate from each other under the action of the magnetic force. A first elastomer and a second elastomer are respectively provided in the first direction and the second direction of the armature to buffer the sliding stroke of the armature, and the armature has a static stable position in the first direction and the second direction respectively. When the armature is in the static stable position, the magnetic force generated by the first permanent magnet and the second permanent magnet themselves that are not excited by the coil can make the armature reach a state of force balance. , and also includes a push rod and a push rod reset member, the push rod and the armature are arranged on the same axis, when the armature slides in the second direction, it pushes the second elastic body in the second direction, and then the second elastic body pushes the push rod to move in the second direction, the push rod reset member is connected to the armature, when the armature slides in the first direction, the push rod reset member can abut against the push rod and push the push rod to move in the first direction; the armature and the push rod are sleeved, and the second elastic body is arranged between the armature and the push rod; also includes a mounting seat, the mounting seat is arranged at one end of the mounting hole, and the other end of the mounting hole is open, the armature extends into the mounting hole from the opening of the mounting hole, the first elastic body is installed in the mounting hole, one end of the first elastic body abuts on the mounting seat, and the other end abuts on the armature.

2. The silent solenoid valve according to claim 1, characterized in that: The armature has a blind hole opened along a first direction, the aperture of the blind hole is larger than the maximum outer diameter of the push rod, the push rod has a first end and a second end which are opposite to each other, the push rod extends into the blind hole with its first end, and the second end of the push rod is exposed outside the blind hole, one end of the second elastic body is in contact with the push rod, and the other end is in contact with the bottom of the blind hole.

3. The silent solenoid valve according to claim 1, characterized in that: The second elastic body is sleeved on the push rod, and the push rod has a first step for the second elastic body to abut against. When the armature slides in the first direction, the push rod reset member can abut against the first step of the push rod and push the push rod to move in the first direction.

4. The silent solenoid valve according to claim 3, characterized in that: The second elastic body is a compression spring or a rubber elastic body.

5. The silent solenoid valve according to claim 2, characterized in that: The push rod reset piece is an end cover which is sleeved on the second end of the push rod and connected to the blind hole opening of the armature. The push rod is provided with a second step for the end cover to abut against.

6. The silent solenoid valve according to claim 1, characterized in that: The first elastic body is a compression spring or a rubber elastic body.

7. The silent solenoid valve according to claim 1, characterized in that: The first elastic body is sleeved on the mounting seat, and the mounting seat is provided with a columnar structure for the first elastic body to sleeve on. One end of the armature in the first direction is provided with a clearance hole for accommodating the columnar structure of the mounting seat.

8. The silent solenoid valve according to claim 1, characterized in that: One end of the push rod in the second direction is connected with a water sealing plug.

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