Electromagnetic drive mechanism for solenoid valve

Abstract

The application relates to an electromagnetic driving mechanism of an electromagnetic valve, which comprises a valve core sleeve with a hollow pipe sleeve, a coil arranged around the outer periphery of the pipe sleeve, and a valve core partially located in the pipe sleeve, wherein at least one annular elastic buffer is arranged between the part of the valve core located in the pipe sleeve and the inner wall of the pipe sleeve. The application pays attention to the fact that vibration is generated due to the frequency of alternating current during the operation of the electromagnetic valve, and the vibration causes the valve core and the valve core sleeve to vibrate and collide, thereby generating noise. In order to solve the noise caused by the above-mentioned reasons, the annular elastic buffer is arranged between the valve core and the inner wall of the pipe sleeve, and the elastic buffer plays a buffering and damping role in the middle during the collision, so that the noise can be reduced.

Description

Technical Field

[0001] This application relates to an electromagnetic drive mechanism for an electromagnetic valve. Background Technology

[0002] Solenoid valves are important components in household appliances for controlling the flow of water. Generally, a solenoid valve includes an electromagnetic drive assembly, such as the structures disclosed in the applicant's prior publications CN200920198649.3, CN202123111481.8, and CN202411072917.2. Typically, the electromagnetic drive assembly includes a valve core sleeve, a valve core, a coil, and a spring. The coil is wound around the outside of the valve core sleeve, and the valve core is located inside the valve core sleeve. The spring acts on the valve core. When the coil is energized, it generates an electromagnetic force on the valve core that is opposite to the spring force. The working principle of a solenoid valve is as follows: When the coil is energized, it generates an electromagnetic force greater than the spring force, attracting the valve core to move towards the spring; when the power is off, the electromagnetic force disappears, and the valve core returns to its original position under the action of the spring force. To adapt to the application needs of different downstream manufacturers, solenoid valves can typically use AC or DC voltage.

[0003] Solenoid valves generate noise during operation due to various reasons. The inventor discovered one such reason: when AC current is applied, due to the physical characteristics of AC current, it has a frequency of 50-60Hz per second. This causes the frequency of the magnetic force generated by the coil when AC current is applied to be the same as the frequency of the current. When the electromagnetic force is greater than the return spring force of the iron core, the iron core is attracted. When the electromagnetic force weakens as the current decreases and becomes less than the spring force, the iron core will slightly "bounce back". This periodic "attracting-bounce back" vibration causes the valve core to be constantly moving, resulting in periodic friction and collision with the valve core sleeve, which in turn causes noise. Utility Model Content

[0004] The purpose of this application is to overcome the shortcomings and deficiencies of the existing technology and to provide an electromagnetic drive mechanism for an electromagnetic valve and an electromagnetic valve.

[0005] The technical solution adopted in this application is as follows: an electromagnetic drive mechanism for a solenoid valve, comprising: Valve core sleeve, having a hollow tube sleeve; The coil is wound around the outer circumference of the sleeve; The valve core, part of which is located inside the sleeve, has at least one annular elastic buffer between the portion of the valve core located inside the sleeve and the inner wall of the sleeve.

[0006] The portion of the valve core located inside the sleeve is provided with a mating wall that fits with the inner wall of the sleeve with a clearance; the elastic buffer is fixed to the outer periphery of the mating wall, and the outer periphery of the elastic buffer protrudes relative to the mating wall and fits with the inner wall of the sleeve with a clearance.

[0007] The elastic buffer is provided in two parts, namely a first elastic buffer and a second elastic buffer, which are located near the upper and lower ends of the mating wall, respectively.

[0008] The elastic buffer is an O-ring.

[0009] The mating wall is provided with an annular groove, and the elastic buffer is embedded in the groove.

[0010] The valve core includes a movable column, the outer peripheral wall of which forms a mating wall that is in clearance fit with the inner wall of the sleeve, the upper end of the sleeve forms an installation port for installing the valve core, and the lower inner wall forms a limiting protrusion ring that limits the movement of the movable column.

[0011] The valve core includes a connecting rod that passes through a limiting protrusion ring. One end of the connecting rod is fixedly connected to the movable column inside the sleeve, and the other end is connected to a sealing plug outside the sleeve.

[0012] It also includes a stationary iron core, which is located inside the sleeve and near the upper end of the sleeve. The stationary iron core is sealed to the inner wall of the sleeve, and a spring is provided between the stationary iron core and the movable column.

[0013] It also includes a frame, which is fixedly connected to the valve core sleeve. The frame includes a limiting plate, which is located at the outer end of the sleeve near the stationary iron core and limits the stationary iron core.

[0014] The outer periphery of the sleeve protrudes to form a connecting plate, and the connecting plate is provided with a slot. The frame includes a fixing plate, and the fixing plate is provided with a card plate that fits into the slot. The limiting plate and the fixing plate are connected by an intermediate plate, and the frame is integrally bent to form the frame.

[0015] The beneficial effects of this application are as follows: This application notes that when a solenoid valve operates, vibrations are generated due to the alternating current frequency, causing the valve core and valve core sleeve to vibrate and collide, resulting in noise. To solve the noise caused by the above reasons, an annular elastic buffer is provided between the valve core and the inner wall of the sleeve. When a collision occurs, the elastic buffer acts as a buffer and shock absorber, thus reducing noise. The practical application scenarios of the technical solution of this application are not limited to the dimensions and shape of the valve core sleeve, the dimensions and shape of the valve core, or the shape and function of the solenoid valve. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this application.

[0017] Figure 1This is a schematic diagram of the structure of one embodiment of this application; Figure 2 This is a cross-sectional view of one embodiment of this application; Figure 3 This is a schematic diagram of the valve core structure according to one embodiment of this application; Figure 4 for Figure 2 Enlarged diagram of part A in the middle; Figure 5 for Figure 2 Enlarged diagram of section B; Figure 6 This is a schematic diagram of the valve core sleeve according to one embodiment of this application; Figure 7 This is a schematic diagram of the framework of one embodiment of this application; In the figure, valve core sleeve-100, pipe sleeve-110, limiting protrusion ring-111, guide surface-112, connecting plate-120, and slot-121; Coil -200; Valve core-300, movable column-310, mating wall-311, groove-312, limit groove-313, connecting rod-320; First elastic buffer - 410, second elastic buffer - 420; Static iron core-500; Spring-600; Frame-700, Limiting plate-710, Fixing plate-720, Clamping plate-721, Middle plate-730. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the application will be described in further detail below with reference to the accompanying drawings.

[0019] It should be noted that all uses of "first" and "second" in the embodiments of this application are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limitations on the embodiments of this application. Subsequent embodiments will not explain this in detail.

[0020] The directional and positional terms used in this application, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this application, and not for limiting the scope of protection of this application.

[0021] Typically, a solenoid valve includes an electromagnetic drive mechanism, which comprises a valve core sleeve 100, a coil 200, and a valve core 300. The valve core sleeve 100 has a hollow tube sleeve 110. The upper part of the valve core 300 extends into the tube sleeve 110 and is limited and slidably engaged with the inner wall of the tube sleeve 110. When the coil 200 is energized, the electromagnetic field acts on the valve core 300 to form an electromagnetic force. Under the constraint of the inner wall of the tube sleeve 110, the valve core 300 moves along the axial direction within the tube sleeve 110. Due to the physical characteristics of alternating current, the valve core will generate periodic friction and collision within the valve core sleeve, resulting in noise. To solve this collision noise problem, this application provides at least one annular elastic buffer in the clearance-fitted valve core 300 and tube sleeve 110. This buffer acts as a shock absorber in the middle when a collision occurs, reducing noise. The actual application scenarios are not limited to the size and shape of the valve core sleeve, the size and shape of the valve core, or the shape and function of the solenoid valve.

[0022] Figures 1-7 As one embodiment of this application, an electromagnetic drive mechanism for a solenoid valve is provided.

[0023] Specifically, such as Figure 1 As shown, it includes a valve core sleeve 100, a coil 200, a valve core 300, and a frame 700.

[0024] like Figure 2 , Figure 6 As shown, the valve core sleeve 100 includes a tube sleeve 110 and a connecting plate 120. The tube sleeve 110 is hollow and open at both ends, and the connecting plate 120 is fixedly connected to the outer peripheral wall of the tube sleeve 110. Figure 2 , Figure 3 As shown, the valve core 300 includes a movable column 310, a connecting rod 320, and a sealing plug 330. The movable column 310 is located inside the sleeve 110, and its outer peripheral wall is a mating wall 311 that fits with the inner wall of the sleeve 110 with a clearance. The connecting rod 320 passes through the opening at the lower end of the sleeve 110, and its lower end is connected to the sealing plug 330. The valve core 300 is wound around the outer periphery of the sleeve 110, and the frame 700 is fixedly connected to the valve core sleeve 100. Specifically, the sleeve 110 and the connecting plate 120 are integrally molded injection parts, the movable column 310 and the connecting rod 320 are integrally molded parts made of ferromagnetic material, the sealing plug 330 is made of elastic sealing material and is used to cooperate with the flow channel inside the solenoid valve to control the fluid, and the frame 700 is an integrally bent part.

[0025] like Figure 2 , Figure 4 , Figure 5As shown, a first elastic buffer 410 and a second elastic buffer 420 are fixed near the upper and lower ends of the mating wall 311, respectively. The outer periphery of the first elastic buffer 410 protrudes relative to the mating wall 311 and is in clearance fit with the inner wall of the sleeve 110. The outer periphery of the second elastic buffer 420 protrudes relative to the mating wall 311 and is in clearance fit with the inner wall of the sleeve 110. Because the first elastic buffer 410 and the second elastic buffer 420 are in clearance fit with the inner wall of the sleeve 110, when the valve core 300 moves longitudinally, it will not generate a large frictional resistance with the inner wall of the sleeve 110, which will affect the operation of the valve core 300. Because the first elastic buffer 410 and the second elastic buffer 420 are respectively set near the upper and lower ends, in the event of a collision, the first elastic buffer 410 and / or the second elastic buffer 420 will collide with the inner wall of the sleeve first, playing a buffering and shock-absorbing role, thereby reducing noise.

[0026] Furthermore, the mating wall 311 is provided with two annular grooves 312 corresponding to the first elastic buffer 410 and the second elastic buffer 420, and the first elastic buffer 410 and the second elastic buffer 420 are embedded in the grooves 312. This prevents the first elastic buffer 410 and the second elastic buffer 420 from moving relative to the valve core 300 during the collision noise reduction process.

[0027] Furthermore, in this embodiment, the first elastic buffer 410 and the second elastic buffer 420 are O-rings. O-rings are very common sealing components, with low cost and easy assembly. In this embodiment, O-rings are used not as sealing components, but as elastic buffers to provide cushioning and shock absorption.

[0028] Furthermore, such as Figure 5 As shown, the upper end of the sleeve 110 forms an installation port for the valve core 300 to be installed, and the lower inner wall forms a limiting protrusion ring 111 that limits the movement of the movable column 310. A guide surface 112 is provided at the installation port to facilitate the insertion of parts inside the sleeve 110. The inner diameter of the limiting protrusion ring 111 is smaller than the outer diameter of the mating wall 311, thereby limiting the movement of the movable column 310 to prevent it from leaving the sleeve 110. The outer diameter of the connecting rod 320 is smaller than the inner diameter of the limiting protrusion ring 111, so that it can pass smoothly through the limiting protrusion ring 111.

[0029] Furthermore, such as Figure 2 As shown, it also includes a stationary iron core 500, which is located inside the sleeve 110 and near the upper end of the sleeve 110. The stationary iron core 500 is sealed to the inner wall of the sleeve 110, and a spring 600 is provided between the stationary iron core 500 and the movable column 310. Figure 4 As shown, the end of the movable column 310 near the stationary iron core 500 is provided with a limiting groove 313 into which the supply spring 600 extends and limits its movement.

[0030] like Figure 7 As shown, the frame 700 is integrally bent to form a limiting plate 710 and a fixing plate 720, and an intermediate plate 730 is connected between the limiting plate 710 and the fixing plate 720. Figure 2 As shown, the limiting plate 710 is located at the outer end of the sleeve 110 near the stationary iron core 500, thus limiting the position of the stationary iron core 500. Figure 6 As shown, the connecting plate 120 is provided with a slot 121, and the fixing plate 720 is provided with a card plate 721 that is inserted into the slot 121. The frame 700 and the valve core sleeve 100 are fixedly connected by the card plate 721 being inserted into the slot 121 in the horizontal direction. At the same time, the limiting plate 710 moves to the upper end of the sleeve 110 to limit the stationary iron core 500.

[0031] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. An electromagnetic drive mechanism for a solenoid valve, characterized in that, include: Valve core sleeve, having a hollow tube sleeve; The coil is wound around the outer circumference of the sleeve; The valve core, part of which is located inside the sleeve, has at least one annular elastic buffer between the portion of the valve core located inside the sleeve and the inner wall of the sleeve.

2. The electromagnetic drive mechanism of the solenoid valve according to claim 1, characterized in that: The portion of the valve core located inside the sleeve is provided with a mating wall that fits with the inner wall of the sleeve with a clearance; the elastic buffer is fixed to the outer periphery of the mating wall, and the outer periphery of the elastic buffer protrudes relative to the mating wall and fits with the inner wall of the sleeve with a clearance.

3. The electromagnetic drive mechanism of the solenoid valve according to claim 2, characterized in that: The elastic buffer is provided in two parts, namely a first elastic buffer and a second elastic buffer, which are located near the upper and lower ends of the mating wall, respectively.

4. The electromagnetic drive mechanism of the solenoid valve according to claim 3, characterized in that: The elastic buffer is an O-ring.

5. The electromagnetic drive mechanism of the solenoid valve according to claim 2, characterized in that: The mating wall is provided with an annular groove, and the elastic buffer is embedded in the groove.

6. The electromagnetic drive mechanism of the solenoid valve according to any one of claims 1-5, characterized in that: The valve core includes a movable column, the outer peripheral wall of which forms a mating wall that is in clearance fit with the inner wall of the sleeve, the upper end of the sleeve forms an installation port for installing the valve core, and the lower inner wall forms a limiting protrusion ring that limits the movement of the movable column.

7. The electromagnetic drive mechanism of the solenoid valve according to claim 6, characterized in that: The valve core includes a connecting rod that passes through a limiting protrusion ring. One end of the connecting rod is fixedly connected to the movable column inside the sleeve, and the other end is connected to a sealing plug outside the sleeve.

8. The electromagnetic drive mechanism of the solenoid valve according to claim 6, characterized in that: It also includes a stationary iron core, which is located inside the sleeve and near the upper end of the sleeve. The stationary iron core is sealed to the inner wall of the sleeve, and a spring is provided between the stationary iron core and the movable column.

9. The electromagnetic drive mechanism of the solenoid valve according to claim 8, characterized in that: It also includes a frame, which is fixedly connected to the valve core sleeve. The frame includes a limiting plate, which is located at the outer end of the sleeve near the stationary iron core and limits the stationary iron core.

10. The electromagnetic drive mechanism of the solenoid valve according to claim 9, characterized in that: The outer periphery of the sleeve protrudes to form a connecting plate, and the connecting plate is provided with a slot. The frame includes a fixing plate, and the fixing plate is provided with a card plate that fits into the slot. The limiting plate and the fixing plate are connected by an intermediate plate, and the frame is integrally bent to form the frame.

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