Pressure balance diaphragm of electromagnetic water valve

Abstract

The invention discloses an electromagnetic water valve pressure balance diaphragm which comprises a diaphragm body made of a flexible material, the diaphragm body is of a disc-shaped structure as a whole, the diaphragm body is provided with a center mounting hole, and the diaphragm body sequentially comprises a first connecting part, a deformation part and a second connecting part from the center to the outside, the inner side of the first connecting part is connected with the side wall of the central mounting hole, the outer side of the first connecting part is connected with the inner side of the deformation part, and the outer side of the deformation part is connected with the inner side of the second connecting part. In the moving process of the connecting rod structure, pressure balance is achieved through structural deformation of the deformation part, and transmission of linear loads and load attenuation in the moving process are completed; after the limiting positions are pressed and balanced, the connecting rod moves from one limiting position to the other limiting position, and in the process, slow descending of load transmission is achieved, that is, it is guaranteed that the stress direction of the connecting rod is consistent with the displacement direction all the time.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic water valves, and particularly relates to a pressure balance diaphragm for an electromagnetic water valve. Background Art

[0002] The core of an electromagnetic valve is the switching of the relationship among electromagnetic force, spring force, and the resistance generated by water pressure on the moving structure. The mode switching of a three-way electromagnetic valve and the on-off of a two-way electromagnetic valve are essentially the changes in the relationship of the resultant force of electromagnetic force and the other two loads, which cause the connecting rod spool of the electromagnetic valve to move.

[0003] Under limited space and power constraints, there is not much room for improvement in electromagnetic force; the spring force needs to satisfy the reset of another switching mode; the water pressure generates resistance to the movement of the connecting rod spool structure, and this resistance changes with the change of water pressure. The greater the water pressure, the greater the resistance and the greater the required electromagnetic force. Since water pressure is one of the core performance indicators of an electromagnetic valve, how to balance the resistance generated by water pressure on the movement of the connecting rod spool structure when the electromagnetic force is constant has become an urgent technical problem to be solved, and there is no relevant research in this regard yet. Summary of the Invention

[0004] In view of the existing technical problems, the present invention provides a pressure balance diaphragm for an electromagnetic water valve to solve the problems in the prior art.

[0005] In order to achieve the above-mentioned invention purpose, the present invention provides the following technical solutions: A pressure balance diaphragm for an electromagnetic water valve, comprising a diaphragm body made of a flexible material. The diaphragm body is integrally in a disc-shaped structure. The diaphragm body has a central mounting hole, and the diaphragm body sequentially includes a first connecting portion, a deformation portion, and a second connecting portion from its center to the outside. The inner side of the first connecting portion is connected to the side wall of the central mounting hole, the outer side of the first connecting portion is connected to the inner side of the deformation portion, and the outer side of the deformation portion is connected to the inner side of the second connecting portion.

[0006] Preferably, the deformation portion is inclined from its inner side to the outside in the axial direction of the diaphragm body.

[0007] With this setting, the load is transmitted through the deformation of the deformation portion to the connecting rod head of the connecting rod structure, ensuring that the force application direction of the connecting rod is always consistent with the displacement direction.

[0008] Preferably, the maximum inclination height H of the deformation portion is greater than the thickness L of the diaphragm body.

[0009] Preferably, the deformation portion and the second connecting portion are connected by an arc structure, and this arc structure is in contact with the end of the connecting rod head of the connecting rod structure.

[0010] With such a setting, by fitting the arc-shaped structure to the end of the connecting rod head of the connecting rod structure, surface-to-surface contact is achieved to better transmit the load.

[0011] Preferably, the arc-shaped structure includes a first arc surface structure and a second arc surface structure, which are connected at their common outer tangent line. The first arc surface structure and the second arc surface structure have the same radius and opposite bending directions.

[0012] Preferably, at least a partial section of one side of the first connecting portion facing the connecting rod head of the connecting rod structure has a abutting plane that abuts against the end face of the connecting rod head of the connecting rod structure.

[0013] With such a setting, during the movement of the valve core structure, it first contacts the abutting plane of the first connecting portion, and then contacts the deformation portion. While transmitting the load through the deformation of the deformation portion, the load can be linearly transmitted to the connecting rod head of the connecting rod structure.

[0014] Preferably, a convex platform is formed by the side wall of the central mounting hole extending axially towards one side of the diaphragm body. The extending direction of the convex platform is the same as the inclination direction of the deformation portion, and the height of the convex platform is greater than the maximum inclination height H of the deformation portion.

[0015] With such a setting, the overall strength of the diaphragm body during the load transmission process is improved through the reasonable design of the convex platform.

[0016] Preferably, the thickness of the convex platform is greater than the maximum inclination height H of the deformation portion.

[0017] With such a setting, the strength of the diaphragm body when the connecting rod structure moves to the extreme position is ensured.

[0018] Preferably, it further includes a sealing portion, and the outside of the second connecting portion is connected to the sealing portion.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: During the movement of the connecting rod structure, the present invention realizes pressure balance through the structural deformation of the deformation portion, completes the transmission of linearized load, and the load attenuation during the movement process is 30%; after the pressure is balanced at the extreme position, the connecting rod moves from one extreme position to another extreme position. During this process, the transmission of the load decreases slowly, and is always greater than the increase brought by the change of the electromagnetic force with the displacement, that is, it ensures that the force direction of the connecting rod is always consistent with the displacement direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is Figure 1 a cross-sectional view of

[0021] Figure 3 is Figure 2 a partially enlarged view; Figure 4 is a schematic diagram of the assembled state of the diaphragm when not under force; Figure 5 is Figure 4 a schematic diagram of the state in the energized mode; Figure 6 is Figure 4 a schematic diagram of the state in the de-energized mode.

[0022] Figure 7 is a linear change diagram of load transfer during the movement of the connecting rod in the finite element simulation mode. Specific embodiments

[0023] The present invention will be further described in detail below in conjunction with test examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments. Any technology implemented based on the content of the present invention belongs to the scope of the present invention.

[0024] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0025] As shown in the attached Figure 1 - attached Figure 6 An electromagnetic water valve pressure balance diaphragm shown in the figure includes a diaphragm body made of a flexible material. The diaphragm body is integrally formed and has an overall disc-shaped structure. The diaphragm body has a central mounting hole 1, and the diaphragm body is mounted on a connecting rod structure through the central mounting hole. A boss is formed on the side wall of the central mounting hole 1 extending axially towards one side of the diaphragm body. The extending direction of the boss is the same as the inclination direction of the deformation part 3, and the height of the boss is greater than the maximum inclination height H of the deformation part 3.

[0026] From Figure 2 and Figure 3It can be seen that the diaphragm body sequentially includes a first connecting portion 2, a deformation portion 3, a second connecting portion 5, and a sealing portion 6 from its center outwards. The inner side of the first connecting portion 2 is connected to the lower end of the side wall of the central mounting hole 1, the outer side of the first connecting portion 2 is connected to the inner side of the deformation portion 3, the outer side of the deformation portion 3 is connected to the inner side of the second connecting portion 5, and the outer side of the second connecting portion 5 is connected to the sealing portion 6. The sealing portion 6 is connected to an external connection structure, achieving sealing of the valve core on the one hand and fixing the outer side of the diaphragm body on the other hand. The sealing portion 6 has an axially symmetric structure, and its thickness is greater than the thickness of the diaphragm body. The deformation portion 3 is inclined from its inner side to its outer side in the axial direction of the diaphragm body, such that the position where the inner side of the deformation portion 3 is located is lower than the position where the outer side of the deformation portion 3 is located, and the maximum inclination height H of the deformation portion 3 is greater than the thickness L of the diaphragm body. The thickness of the boss is greater than the maximum inclination height H of the deformation portion 3. The deformation portion 3 and the second connecting portion 4 are connected by an arc structure. The arc structure includes a first arc surface structure 4 and a second arc surface structure 8. The first arc surface structure 4 and the second arc surface structure 8 are connected at their common outer tangent, that is, the connection portion of the first arc surface structure 4 and the second arc surface structure 8 is located on the tangent of the first arc surface structure 4 and the second arc surface structure 8. The first arc surface structure 4 and the second arc surface structure 8 have the same radius and opposite bending directions. The first arc surface structure 4 is in contact with the end of the connecting rod head of the connecting rod structure. The water pressure causes the end of the connecting rod head of the connecting rod structure to be in contact with the first arc surface structure 4 on the deformation portion 3, achieving surface-to-surface contact, which can enable better linear transmission of the load. The side of the deformation portion 3 facing the connecting rod head of the connecting rod structure matches the end surface at the corresponding position of the connecting rod head. In this way, the water pressure causes the side of the deformation portion 3 facing the connecting rod head of the connecting rod structure to be in contact with the end surface at the corresponding position of the connecting rod head, achieving surface-to-surface contact to better transmit the load.

[0027] At least a partial section of the side of the first connecting portion 2 facing the connecting rod head of the connecting rod structure has an abutting plane 21 that abuts against the end surface of the connecting rod head of the connecting rod structure. Taking the axial direction of the central mounting hole 1 in the attached drawings of this embodiment as the vertical direction, the abutting plane 21 is arranged horizontally in this embodiment. Of course, the abutting plane 21 is mainly for cooperating with the end surface of the connecting rod head of the connecting rod structure. Therefore, when the end surface of the connecting rod head of the connecting rod structure at the position cooperating with the abutting plane 21 is an inclined surface, the abutting plane 21 is also correspondingly set as an inclined surface. The end surface of the first connecting portion 2 away from the connecting rod head of the connecting rod structure can be a plane or an inclined surface. The connection between the first connecting portion 2 and the side wall of the central mounting hole 1 is also connected by an arc transition.

[0028] Figures 4 - 6Shows different states of the balance diaphragm applied to the three-way solenoid valve and its installation position on the three-way solenoid valve. During specific installation, a balance diaphragm is installed at the upper and lower positions of the connecting rod head of each connecting rod structure. The two balance diaphragms are symmetrically arranged. Then, the outer ring of the balance diaphragm is fixed by a compression ring, that is, the sealing part 6 is fixedly connected to the compression ring to fix the outer ring of the balance diaphragm. The central mounting hole of the balance diaphragm is installed through the connecting rod structure to fix the inner ring of the balance diaphragm. Figure 4 Is a schematic diagram of the assembly state of the diaphragm when not under force. At this time, the connecting rod head is located in the middle position between the two diaphragms; when powered on, the electromagnetic force is dominant, and the electromagnetic force is greater than the spring force and the water pressure resistance. The connecting rod moves downward, and the abutting plane 21 of the first connecting part on the diaphragm first contacts the end face of the connecting rod head. As the connecting rod continues to move downward, the contact area between the connecting rod head and the diaphragm increases. At this time, the deformation part 3 and the arc structure connecting it to the second connecting part start to deform. The connecting rod continues to move downward until the end face of the connecting rod head fits against the opposite face of the deformation part of the diaphragm (see Figure 5). At this time, the load is linearly transmitted to the connecting rod, achieving the force balance of the connecting rod in the moving direction of the water pressure; when switching from the powered-on state to the powered-off state, at the moment before the switch, the position of the connecting rod remains unchanged, that is, the pressure balance state is still maintained. The connecting rod is only affected by the spring force. As the position of the connecting rod changes, the spring force decreases, and the load transmitted by the diaphragm to the connecting rod will weaken (see Figure 7 ). At this time, absolute pressure balance cannot be achieved, but the spring force is still greater than the water pressure resistance. At the same time, the connecting rod moves further, and the water pressure will decrease, weakening the influence of the reduced force transmission at the diaphragm end. The resultant force received by the connecting rod during this process is consistent with the moving direction, realizing the mode switch; when in the powered-off state, the spring force is dominant. The water pressure generates pressure on the lower sealing gasket. The high stiffness of the sealing gasket will transmit all the load to the connecting rod. The connecting rod moves upward, and the abutting plane 21 of the first connecting part on the diaphragm first contacts the end face of the connecting rod head. As the connecting rod continues to move upward, the contact area between the connecting rod head and the diaphragm increases. At this time, the deformation part 3 starts to deform. The connecting rod continues to move upward until the end face of the connecting rod head fits against the opposite face of the deformation part of the diaphragm (see Figure 6). At this time, the load is linearly transmitted to the connecting rod, achieving the compression balance.

[0029] Through finite element simulation experiments, the linear change of the load of the diaphragm can be compared with the reference Figure 7 .

[0030] This embodiment realizes the mode switching of the solenoid valve at 8V voltage and 0.5Mpa; the maximum stroke of the reciprocating movement of the connecting rod up and down is up to 5mm; the double diaphragms installed symmetrically have a maximum resistance of no more than 0.1N for the reciprocating movement of 4mm when unloaded; at the upper and lower extreme positions, the load pressure and the transmitted pressure are highly linear; when compressed by 0.2Mpa at the extreme positions, the connecting rod moves 2mm, and the load loss transmitted does not exceed 30%; the life of the reciprocating movement when unloaded is 8 million times, and the life of the reciprocating movement under the pressure of 0.2Mpa is 3.6 million times; the cost of the diaphragm is relatively low; the installation is simple and easy to operate.

[0031] The preferred specific embodiments of the present invention have been described above. It should be understood that those of ordinary skill in the art can make many modifications and variations according to the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A pressure balancing diaphragm for an electromagnetic water valve, characterized in that: The invention comprises a diaphragm body made of a flexible material, the diaphragm body being in a disc-shaped structure as a whole, the diaphragm body having a central mounting hole (1), and the diaphragm body comprising, from the center to the outside, a first connecting portion (2), a deformation portion (3) and a second connecting portion (5), the inner side of the first connecting portion (2) being connected to the side wall of the central mounting hole (1), the outer side of the first connecting portion (2) being connected to the inner side of the deformation portion (3), and the outer side of the deformation portion (3) being connected to the inner side of the second connecting portion (5).

2. The electromagnetic water valve pressure balancing diaphragm according to claim 1, characterized in that: The deformation portion (3) is arranged to be inclined in the axial direction of the diaphragm body from the inner side to the outer side thereof.

3. The electromagnetic water valve pressure balancing diaphragm according to claim 2, characterized in that: The maximum inclination height H of the deformation portion (3) is greater than the thickness L of the diaphragm body.

4. The electromagnetic water valve pressure balancing diaphragm according to claim 1, characterized in that: The deformation portion (3) and the second connection portion (4) are transitionally connected via an arc-shaped structure, and the arc-shaped structure fits with the end of the connecting rod head of the connecting rod structure.

5. The electromagnetic water valve pressure balancing diaphragm according to claim 4, characterized in that: The arc-shaped structure comprises a first arc surface structure (4) and a second arc surface structure (8); the first arc surface structure (4) and the second arc surface structure (8) are connected at their common external tangent line; the first arc surface structure (4) and the second arc surface structure (8) have the same radius and opposite bending directions.

6. The electromagnetic water valve pressure balancing diaphragm according to claim 2, characterized in that: At least a portion of the first connecting portion (2) on one side facing the connecting rod head of the connecting rod structure has an abutting plane (21) abutting against the end surface of the connecting rod head of the connecting rod structure.

7. The electromagnetic water valve pressure balancing diaphragm according to claim 3, characterized in that: The side wall of the central mounting hole (1) extends along its axial direction toward one side of the diaphragm body to form a boss, the extension direction of the boss is the same as the inclination direction of the deformation portion (3), and the height of the boss is greater than the maximum inclination height H of the deformation portion (3).

8. The electromagnetic water valve pressure balancing diaphragm according to claim 7, characterized in that: The thickness of the boss is greater than the maximum inclination height H of the deformation portion (3).

9. The electromagnetic water valve pressure balancing diaphragm according to claim 1, characterized in that: It also comprises a sealing portion (6), to which the outer side of the second connecting portion (5) is connected.

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