Noise reduction assembly of electromagnetic valve, electromagnetic valve and control method

Abstract

The noise reduction assembly is matched with a framework, a coil, a valve cavity, a movable valve element, a fixed valve element and a metal outer frame of the electromagnetic valve and comprises a limiting structure used for interfering the concave-convex matching process of the movable valve element and the fixed valve element when the electromagnetic valve is powered on and a reset spring arranged between the movable valve element and the fixed valve element. Through interference of the limiting structure, the matching process of the movable valve element and the fixed valve element comprises a first working state and a second working state. The invention further provides the electromagnetic valve and a control method of the electromagnetic valve. The electromagnetic valve has the advantages of saving energy, reducing noise and saving cost.

Description

Technical Field

[0001] This invention relates to the technical field of solenoid valves, and in particular to a noise reduction component for a solenoid valve, a solenoid valve, and a control method thereof. Background Technology

[0002] Solenoid valves, as core components of fluid control, are widely used in industrial production and civilian equipment. However, their existing technology has three major pain points, which are particularly prominent in scenarios where quiet operation and energy saving are of paramount importance. Traditional solenoid valves rely on a single spring for valve core engagement and reset. Under the alternating action of electromagnetic force and spring force, the valve core is prone to axial movement. After detaching from the guide structure, it will have a rapid and rigid impact with the valve seat or limiting component. Even in industrial settings, the noise can reach more than 50dB. In a quiet sleep environment, noise above 40dB can interfere with the process of falling asleep and disrupt the deep sleep cycle.

[0003] To address the above problems, this invention provides a noise reduction component for a solenoid valve, a solenoid valve, and a control method thereof. Summary of the Invention

[0004] To solve the above problems, the technical solution of the present invention is as follows: A noise reduction component for a solenoid valve, wherein the noise reduction component cooperates with the solenoid valve's frame, coil, valve cavity, moving valve core, fixed valve core, and metal outer frame, characterized in that the noise reduction component includes a limiting structure for interfering with the interlocking process of the moving valve core and the fixed valve core, and a return spring disposed between the moving valve core and the fixed valve core, wherein the interlocking process of the moving valve core and the fixed valve core includes, through the interference of the limiting structure, the interlocking process of the moving valve core and the fixed valve core includes: First working state: After the solenoid valve is de-energized, the moving valve core is reset by the return spring, and the moving valve core and the fixed valve core are in the de-energized reset reference position; Second working state: After the solenoid valve is energized, the moving valve core moves along the valve cavity toward the fixed valve core until the moving valve core and the fixed valve core stop moving relative to each other, and a buffer gap is provided between the moving valve core and the fixed valve core; The buffer gap is the movable stroke L of the moving valve core along the axial direction toward the fixed valve core when it is not constrained. The movable stroke L ≥ K(D−ε) (where K is a dimensionless proportionality coefficient with a value of 0.25 and no unit, ε is a dimensional correction term with a value of 3 and a unit of mm, D is the diameter of the moving valve core with a unit of mm, and D≥4mm, and L is the movable stroke with a unit of mm). The return spring is connected to the moving valve core and is used to drive the moving valve core to smoothly return from the second working state to the first working state, adapting to the linear control of the valve core movement.

[0005] Further settings: When the solenoid valve is energized and engaged, the fixed valve core and the metal outer frame are radially magnetically attracted, causing the moving valve core to shift and tightly adhere to one side of the inner wall of the frame, forming an engaging damping effect.

[0006] Further settings: The limiting structure is located inside the valve cavity.

[0007] Further settings: The limiting structure is at least one locking block arranged along the axial direction of the valve cavity; and / or a first sealing element disposed at the end of the moving valve core away from the fixed valve core; and / or a second sealing element disposed between the moving valve core and the fixed valve core.

[0008] Further settings: The first sealing element is a buffer sealing gasket, and the second sealing element is disposed at one end of the moving valve core near the fixed valve core, or at one end of the fixed valve core near the moving valve core, or in the valve cavity between the moving valve core and the fixed valve core, and the second sealing element is a buffer gasket or a buffer sealing gasket.

[0009] Further settings: The reset spring is a straight-tube variable-density spring or a tower-shaped spring.

[0010] A solenoid valve, characterized in that the solenoid valve includes a noise reduction component of the solenoid valve according to any one of claims 1-7.

[0011] Based on the aforementioned control method for the solenoid valve, the driving power of the solenoid valve is divided into three levels: reset power, holding power, and rated power, wherein the reset power ≤ holding power < rated power. The control method is characterized by including engagement control and reset control. Pull-in control: After power is applied, the drive power is gradually adjusted from the initial power to the rated power. The initial power is greater than 0 and less than the holding power, so that the moving valve core moves towards the fixed valve core under the linear adaptation of the pull-in damping, buffer gap and return spring. After the moving valve core completes the pull-in, the drive power switches to the holding power for continuous operation. Reset control: First, the driving power is adjusted from the holding power to 0 power. During the power gradual change process, the moving valve core is smoothly reset to the first working state under the linear drive of the reset spring.

[0012] Further settings: The holding power is 40%-60% of the rated power.

[0013] The beneficial effects of this invention are as follows: 1. The relative movement of the moving valve core and the fixed valve core during their interlocking action is interfered with by a limiting structure. This movement process is divided into a first working state and a second working state. The first working state is the power-off reset reference position where the moving and fixed valve cores are in interlocking action. After power is cut off, the reset spring drives the valve to reset. The second working state is the engaged state of the first state. In this state, the moving and fixed valve cores maintain their interlocking action with a buffer gap. By precisely setting the buffer gap, the solenoid valve is ensured to operate at the lowest possible drive power, preventing the moving and fixed valve cores from interlocking. Rapid impact generates noise, achieving the important effects of energy saving and noise reduction simultaneously; when the solenoid valve is energized, the moving valve core is radially magnetically attracted by the top valve core and the metal outer frame, causing the moving valve core to shift and tightly adhere to one side of the inner wall of the frame to form a suction damping, which works in conjunction with the buffer gap to decelerate, ensuring that the moving valve core can decelerate in a shorter stroke, thereby avoiding noise generated during the suction process of the moving valve core and the fixed valve core. Moreover, under the action of suction damping, the deceleration power generated by the friction of the suction damping is supplemented, which can also achieve the same deceleration effect and achieve energy saving. 2. By setting the return spring as a straight cylindrical variable density spring or a tower-shaped spring, the density of the straight cylindrical variable density spring gradually changes along the direction of movement of the moving valve core. The density change matches the force value change of the linear tension curve, ensuring the linear driving force output during the movement of the moving valve core and avoiding noise caused by the impact of the moving valve core movement. 3. By controlling the solenoid valve, the reset power, holding power, and rated power are switched during the engagement and reset of the moving valve core. This ensures that the moving speed of the moving valve core is adjusted during engagement and reset, and that the moving valve core makes slow contact with the fixed valve core and the upper port of the valve cavity when they are engaged, thus avoiding rapid rigid collisions and noise generation. Attached Figure Description

[0014] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0015] in: Figure 1 This is a diagram showing the fit between the moving valve core and the stationary valve core for types P1 and P2. Figure 2 yes Figure 1 The force change diagram of the separation process between the two types of moving valve cores and stationary valve cores; Figure 3 It is P1 in Figure 2 Location diagram of points A and B in the middle; Figure 4 This is a cross-sectional view of a solenoid valve according to the present invention, wherein the air outlet is connected to the air vent. Figure 5This is a cross-sectional view of another type of solenoid valve of the present invention, wherein the air outlet is connected to the air vent. Figure 6 This is a cross-sectional view of another type of solenoid valve of the present invention, wherein the air outlet is connected to the valve chamber; Figure 7 This is a cross-sectional view of another type of solenoid valve of the present invention, wherein the air outlet is connected to the air vent. Figure 8 This is a diagram showing the fit between the four different moving valve cores (S1, S2, S3, and S4) and the stationary valve core in this invention. Figure 9 These are two structural diagrams of the reset spring of this invention; Figure 10 This is a schematic diagram of power adjustment for the control method of the present invention.

[0016] Label Explanation: 1. Frame; 2. Coil; 3. Valve cavity; 4. Moving valve core; 5. Fixed valve core; 6. Metal outer frame; 7. Limiting structure; 71. Locking block; 72. First seal; 73. Second seal; 8. Return spring; 9. Buffer gap. Detailed Implementation

[0017] To make the technical problems, technical solutions, and beneficial effects of this invention clearer and more understandable, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0018] exist Figures 1-3 The diagram shows the force changes during the separation process of two different valve core mating methods (P1 and P2). Figure 3 correspond Figure 2 The separation position diagram of points A and B shows that the valve cavity force values ​​of the moving valve core and the fixed valve core in segment AB tend to change linearly. If the moving valve core and the fixed valve core take point A as the separation starting point, the required driving power will be more controllable, avoiding rigid collisions between the moving valve core and the fixed valve core when they are engaged, thereby avoiding noise. Therefore, the present invention designs the following scheme.

[0019] Example 1 is as follows: Reference Figures 4-7 A noise reduction component for a solenoid valve, comprising a frame 1, a coil 2, a valve cavity 3, a moving valve core 4, a fixed valve core 5, and a metal outer frame 6, wherein the noise reduction component includes a limiting structure 7 for interfering with the interlocking process of the moving valve core 4 and the fixed valve core 5 when the solenoid valve is energized, and a return spring 8 disposed between the moving valve core 4 and the fixed valve core 5. The limiting structure 7 is disposed within the valve cavity 3, and the interlocking process of the moving valve core 4 and the fixed valve core 5 through the interference of the limiting structure 7 includes: First working state: After the solenoid valve is de-energized, the moving valve core 4 is reset by the return spring 8, and the moving valve core 4 and the fixed valve core 5 are in the de-energized reset reference position; Second working state: After the solenoid valve is energized, the moving valve core 4 moves along the valve cavity 3 toward the fixed valve core 5 until the moving valve core 4 and the fixed valve core 5 stop moving relative to each other. A buffer gap 9 is provided between the moving valve core 4 and the fixed valve core 5. The reset spring 8 is connected to the moving valve core 4 and is used to drive the moving valve core 4 to smoothly reset from the second working state to the first working state, adapting to the linear control of the valve core movement.

[0020] The buffer gap 9 is the movable stroke L of the moving valve core 4 along the axial direction towards the fixed valve core 5 when it is not constrained. The movable stroke L ≥ K(D−ε) (where K is a dimensionless proportionality coefficient with a value of 0.25 and no unit, ε is a dimensional correction term with a value of 3 and a unit of mm, D is the diameter of the moving valve core 4 in mm, and D≥4mm, and L is the movable stroke in mm). Preferably, the diameter of the moving valve core 4 is 4-20mm. It should be noted that the dimensionless proportionality coefficient K and the dimensional correction term ε are derived based on the correlation between the cross-sectional area of ​​the valve core and the impact kinetic energy, and are not subjectively set. The diameter of the moving valve core 4, the dimensionless proportionality coefficient K, and the dimensionless correction term ε are all related to the magnitude of the magnetic attraction force between the moving valve core and the fixed valve core; and are not limited to... Figure 8 The four types of valve core 4 and fixed valve core 5 are matched in such a way that the movable stroke L ≥ K(D−ε). This ensures that when the valve core 4 moves from the first working state to the second working state, it decelerates within the movable stroke of the valve cavity 3, and the valve core 4 and fixed valve core 5 do not contact or do not make complete contact. This reduces the huge noise generated by the rapid rigid collision between the valve core 4 and fixed valve core 5. When the solenoid valve is energized and attracted, the fixed valve core 5 and the metal outer frame 6 are radially magnetically attracted, and the valve core 4 is offset and tightly attached to one side of the inner wall of the frame 1 to form a suction damping. This not only solves the noise generated by the collision caused by the non-radial movement of the valve core 4 when it moves in the valve cavity 3, but also achieves the same deceleration effect by supplementing the deceleration power generated by the friction of the suction damping through the action of suction damping. This achieves the effect of energy saving, and the holding power requirement of the solenoid valve is lower, which can reduce the number of coils in the coil 2 and save costs.

[0021] The limiting structure 7 is at least one locking block 71 arranged axially along the valve cavity; and / or a first sealing element 72 disposed at the end of the moving valve core 4 away from the fixed valve core 5; and / or a second sealing element 73 disposed between the moving valve core 4 and the fixed valve core 5. The first sealing element 72 is a buffer sealing gasket, and the second sealing element 73 is disposed at the end of the moving valve core 4 near the fixed valve core 5, or at the end of the fixed valve core 5 near the moving valve core 4, or in the valve cavity 3 between the moving valve core 4 and the fixed valve core 5. The second sealing element 73 is a buffer gasket or a buffer sealing gasket. The diameter of the first sealing element 72 is larger than the distance between the two locking blocks 71. After power is cut off, the first sealing element 72 forms a seal with the air inlet of the valve cavity 3. After power is applied, the first sealing element 72 abuts against the upper end face of the two locking blocks 71 to form a seal.

[0022] A damper is provided on the moving valve core 4 or inside the valve cavity 3 to enhance the movement damping of the moving valve core 4. The damper has a directional movement and can be single-tooth or multi-tooth type. The damper can be integrally formed with the first sealing element 72. Reference Figure 9 The reset spring 8 is set as a straight cylindrical variable density spring or a tower-shaped spring. The density of the straight cylindrical variable density spring gradually changes along the direction of movement of the moving valve core. The density change matches the force value change of the linear tension curve, ensuring the linear driving force output during the movement process and avoiding noise generated by reset impact.

[0023] Example 2 is as follows: The difference between this embodiment and embodiment 1 is that, through the interference of the limiting structure 7, the engagement process between the moving valve core 4 and the fixed valve core 5 can also include: First working state: After the solenoid valve is de-energized, the moving valve core 4 is reset by the return spring 8, and the moving valve core 4 and the fixed valve core 5 are in the de-energized reset reference position; Second working state: After the solenoid valve is energized, the moving valve core 4 moves along the valve cavity 3 to the fixed valve core 5 and leaves a buffer gap 9. Third working state: The solenoid valve remains energized, and the moving valve core 4 continues to move along the valve cavity 3 toward the fixed valve core 5. This process takes place in the buffer gap 9. Fourth working state: The solenoid valve remains energized, and the moving valve core 4 and the fixed valve core 5 maintain a concave-convex fit position, with no further relative displacement between them; With the buffer gap 9 present, the moving valve core 4 can also enter the third and fourth working states, further increasing the moving stroke of the moving valve core 4 and providing more time for the solenoid valve to switch drive power.

[0024] Example 3 is as follows: A solenoid valve, comprising the noise reduction components of the solenoid valves of Embodiments 1 and 2.

[0025] Reference Figure 10 The control method for this solenoid valve is as follows: The solenoid valve has five drive power levels: 0, reset power, reset power, holding power, and rated power. The power levels are: 0 < reset power < reset power ≤ holding power < rated power. The holding power is 40%-60% of the rated power. Control methods include pull-in control and reset control. Pull-in control: After power is applied, the drive power is gradually adjusted from the initial power to the rated power. The initial power is greater than 0 and less than the holding power, so that the moving valve core 4 moves towards the fixed valve core 5 under the linear adaptation of the pull-in damping, buffer gap 9 and return spring 8. After the moving valve core 4 completes the pull-in, the drive power switches to the holding power for continuous operation. Reset control: First, the drive power is switched from holding power to reset power and then adjusted to 0 power. During the power gradual change process, the moving valve core 4 is smoothly reset to the first working state under the linear drive of the reset spring 8.

[0026] During reset control, the process of adjusting the drive power from the holding power to zero power can be achieved by first reducing the drive power from the holding power to the reset power, then reducing the drive power from the reset power to the completed reset power, and finally reducing the drive power from the completed reset power to zero.

[0027] By switching the drive power, the moving speed of the valve core 4 after power is turned off or on is adjusted. In conjunction with the function of the limit structure 7, noise reduction is achieved while saving power, thus achieving the effect of energy saving and noise reduction.

[0028] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A noise reduction component for a solenoid valve, the noise reduction component cooperating with the solenoid valve's frame (1), coil (2), valve chamber (3), moving valve core (4), fixed valve core (5), and metal outer frame (6), characterized in that, The noise reduction component includes a limiting structure (7) for interfering with the interlocking process of the moving valve core (4) and the fixed valve core (5), and a return spring (8) disposed between the moving valve core (4) and the fixed valve core (5). Through the interference of the limiting structure (7), the interlocking process of the moving valve core (4) and the fixed valve core (5) includes: First working state: After the solenoid valve is de-energized, the moving valve core (4) is reset by the return spring (8), and the moving valve core (4) and the fixed valve core (5) are in the de-energized reset reference position; Second working state: After the solenoid valve is energized, the moving valve core (4) moves along the valve cavity (3) toward the fixed valve core (5) until the moving valve core (4) and the fixed valve core (5) stop moving relative to each other. A buffer gap (9) is provided between the moving valve core (4) and the fixed valve core (5). The buffer gap (9) is the movable stroke L of the moving valve core (4) in the axial direction toward the fixed valve core (5) when it is not constrained. The movable stroke L ≥ K(D−ε) (where K is a dimensionless proportional coefficient with a value of 0.25 and no unit, ε is a dimensionless correction term with a value of 3 and a unit of mm, D is the diameter of the moving valve core (4) in mm and D≥4mm, and L is the movable stroke in mm). The reset spring (8) is connected to the moving valve core (4) and is used to drive the moving valve core (4) to smoothly reset from the second working state to the first working state, adapting to the linear control of the valve core movement.

2. The noise reduction component of the solenoid valve according to claim 1, characterized in that, When the solenoid valve is energized and engaged, the fixed valve core (5) and the metal outer frame (6) are radially magnetically attracted, and the moving valve core (4) is deflected and tightly adheres to one side of the inner wall of the frame (1) to form an engaging damping.

3. The noise reduction component of the solenoid valve according to claim 1, characterized in that, The limiting structure (7) is disposed inside the valve cavity (3).

4. The noise reduction component of the solenoid valve according to claim 3, characterized in that, The limiting structure (7) is at least one locking block (71) arranged along the axial direction of the valve cavity; and / or a first sealing element (72) disposed at the end of the moving valve core (4) away from the fixed valve core (5); and / or a second sealing element (73) disposed between the moving valve core (4) and the fixed valve core (5).

5. The noise reduction component of the solenoid valve according to claim 4, characterized in that, The first sealing element (72) is a buffer sealing gasket, and the second sealing element (73) is disposed at one end of the moving valve core (4) near the fixed valve core (5), or at one end of the fixed valve core (5) near the moving valve core (4), or in the valve cavity (3) between the moving valve core (4) and the fixed valve core (5), and the second sealing element (73) is a buffer gasket or a buffer sealing gasket.

6. The noise reduction component of the solenoid valve according to claim 1, characterized in that, The reset spring (8) is a straight cylindrical variable density spring or a tower-shaped spring.

7. A solenoid valve, characterized in that, The solenoid valve includes the noise reduction component of the solenoid valve according to any one of claims 1-6.

8. A control method for a solenoid valve based on claim 7, wherein the driving power of the solenoid valve is divided into three levels: reset power, holding power, and rated power, and the reset power ≤ holding power < rated power, characterized in that, The control method includes engagement control and reset control: Pull-in control: After power is applied, the drive power is gradually adjusted from the initial power to the rated power. The initial power is greater than 0 and less than the holding power, so that the moving valve core (4) moves towards the fixed valve core (5) under the linear adaptation of the pull-in damping, buffer gap (9) and return spring (8). After the moving valve core (4) completes the pull-in, the drive power is switched to the holding power for continuous operation. Reset control: First, the driving power is adjusted from the holding power to 0 power. During the power gradual change process, the moving valve core (4) is smoothly reset to the first working state under the linear drive of the reset spring (8).

9. The control method for the solenoid valve according to claim 8, characterized in that, The holding power is 40%-60% of the rated power.

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