An electric sanitary diaphragm valve

Abstract

The present invention relates to the technical field of diaphragm valves, and particularly to an electric sanitary diaphragm valve. A liquid inlet and a liquid outlet are provided on a valve body; a valve cover is connected to the valve body, a push block channel is arranged inside the valve cover, a press head is arranged inside the push block channel, a push block motor is arranged at one end of the push block channel, the push block motor drives the press head to reciprocate axially along the push block channel, and the lower surface of the press head is set as a first inclined surface; a diaphragm is arranged at the connection between the valve cover and the valve body, the diaphragm is connected to the lower end of a diaphragm ejector rod, the upper end of the diaphragm ejector rod is inserted into the push block channel and abuts against the lower surface of the press head, and a reset member is arranged between the diaphragm ejector rod and the valve cover. The present invention realizes the movement of the diaphragm ejector rod in another direction by the way of the push block motor pushing the press head, has low sealing requirements, is simple and compact in structure, small in volume, will not introduce new pollution sources such as lubricating oil to cause secondary pollution to the solution, and has good sanitary performance.

Description

Technical Field

[0001] The present invention relates to the technical field of diaphragm valves, and in particular to an electric sanitary diaphragm valve. Background Art

[0002] A diaphragm valve uses a diaphragm as the closing member. The valve stem is driven by a handwheel, pneumatic or electric drive device to move up and down along the axis, isolating the drive component from the medium. Its main function is to connect or cut off the medium in the pipeline and control the opening and closing of the medium flow.

[0003] Only the diaphragm and the valve body come into contact with the working medium of the diaphragm valve, and both can be made of a variety of different materials. Therefore, this valve can ideally control a variety of working media, especially suitable for media with chemical corrosion or suspended particles. Diaphragm valves are mainly used in production equipment such as biopharmaceuticals, food processing, beverage production, and water supply. Diaphragm valves have a simple structure, low fluid resistance, and are easy to seal. They can be applied to production working conditions with low temperature, low pressure, suspended particles, and strongly corrosive media.

[0004] At present, diaphragm valves on the market are classified by drive method into manual diaphragm valves, pneumatic diaphragm valves, and electric diaphragm valves. Among them, sanitary diaphragm valves are mostly driven by cylinders, but cylinder drive has large resistance, large volume, high sealing requirements, and is prone to mutual contamination between liquids. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of large resistance, large volume, and high sealing requirements of pneumatic sanitary diaphragm valves in the prior art, and provide an electric sanitary diaphragm valve.

[0006] To solve the above technical problem, the present invention provides an electric sanitary diaphragm valve, including:

[0007] A valve body, on which a liquid inlet and a liquid outlet are provided;

[0008] A valve cover, which is connected to the valve body. A push block channel is provided inside the valve cover. A pressure head is provided in the push block channel. A push block motor is provided at one end of the push block channel. The push block motor drives the pressure head to reciprocate axially along the push block channel. The lower surface of the pressure head is set as a first inclined surface;

[0009] A diaphragm, which is arranged at the connection between the valve cover and the valve body. The diaphragm is connected to the lower end of a diaphragm ejector rod. The upper end of the diaphragm ejector rod is inserted into the push block channel and abuts against the lower surface of the pressure head. A reset member is provided between the diaphragm ejector rod and the valve cover.

[0010] In one embodiment of the present invention, a pressure rod is provided on one side of the valve cover opposite to the diaphragm push rod. One end of the pressure rod passes through the valve cover and presses against the upper surface of the pressure head, and the other end extends into the adjusting member and abuts against the adjusting spring in the adjusting member.

[0011] In one embodiment of the present invention, the upper surface of the pressure head is a second inclined surface with an inclination direction opposite to that of its lower surface.

[0012] In one embodiment of the present invention, the diaphragm push rod includes a push rod body and a push rod head. The diameter of the push rod head is larger than the diameter of one end of the push rod body connected thereto. The reset member is an abutting seat. One end of the abutting seat is connected to the pressure head, and the other end is provided with an avoidance groove for cooperating with the push rod body. A reset channel corresponding to the size of the push rod head is formed between the abutting seat and the first inclined surface.

[0013] In one embodiment of the present invention, an anti - detachment head is provided at the lower end of the diaphragm push rod. The cross - section of the anti - detachment head is in the shape of a "work" character, and the diaphragm is injection - molded integrally with the anti - detachment head.

[0014] In one embodiment of the present invention, the cross - section of the diaphragm is in the shape of an "H", and a groove corresponding to the protrusion on the lower surface of the diaphragm is provided on the valve body.

[0015] In one embodiment of the present invention, the push - block motor is a through - type linear motor, and the motor shaft of the push - block motor is fixedly connected to the pressure head.

[0016] In one embodiment of the present invention, the valve cover includes a cover cylinder and a limiting member. An installation hole is provided in the cover cylinder corresponding to the position of the valve body. The limiting member is inserted into the installation hole. A limiting hole matching the diameter of the diaphragm push rod is provided in the limiting member. The outer periphery of the lower surface of the limiting member abuts against the valve body, and an activity space is formed between the middle part of the limiting member and the valve body.

[0017] In one embodiment of the present invention, the valve seat in the valve body that separates the liquid inlet and the liquid outlet is arranged offset from the center of the diaphragm.

[0018] In one embodiment of the present invention, the first inclined surface is an arc - shaped inclined surface, and the top of the diaphragm push rod is a smooth arc surface.

[0019] The above - mentioned technical solution of the present invention has the following advantages compared with the prior art:

[0020] The electric sanitary diaphragm valve described in the present invention realizes the movement of the diaphragm ejector rod in the other direction by means of a push block motor pushing the pressure head. On the one hand, the sealing requirement is low, no additional pressure air source needs to be introduced, the structure is simple and compact, the volume is small, and the efficiency is high. On the other hand, even if the diaphragm ruptures, no new pollution sources such as lubricating oil will be introduced to cause secondary pollution to the solution, and the sanitary performance is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the content of the present invention easier to be clearly understood, the following further details the present invention according to the specific embodiments of the present invention in conjunction with the drawings, wherein

[0022] Figure 1 is a cross-sectional view of the present invention;

[0023] Figure 2 is an enlarged view of the diaphragm structure of the present invention.

[0024] Explanation of the reference numerals in the drawings: 10, valve body; 11, liquid inlet; 12, liquid outlet; 13, valve seat; 14, groove;

[0025] 20, valve cover; 21, push block channel; 22, pressure head; 221, first inclined surface; 222, second inclined surface; 23, push block motor; 231, motor shaft; 24, pressure rod; 25, adjusting member; 26, adjusting spring; 27, abutting seat; 271, avoidance groove; 272, reset channel; 28, cover cylinder; 29, limiting member;

[0026] 30, diaphragm; 31, diaphragm ejector rod; 311, ejector rod body; 312, ejector rod head; 313, anti-disengagement head; 32, protrusion. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following further describes the present invention in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the embodiments given are not intended to limit the present invention.

[0028] Referring to Figure 1 as shown, an electric sanitary diaphragm valve of the present invention includes:

[0029] A valve body 10, on which a liquid inlet 11 and a liquid outlet 12 are provided.

[0030] Valve cover 20, the valve cover 20 is connected to the valve body 10. A push block channel 21 is provided inside the valve cover 20. A press head 22 is provided inside the push block channel 21. One end of the push block channel 21 is provided with a push block motor 23. The push block motor 23 drives the press head 22 to reciprocate axially along the push block channel 21. The lower surface of the press head 22 is set as a first inclined surface 221. In the present invention, the push block channel 21 can be set to match the size of the press head 22, so that the push block channel 21 can guide the movement of the press head 22 and prevent the direction of the press head 22 from being unstable. In other embodiments, the press head 22 can be ensured to move axially along the push block channel 21 in other ways. Since the lower surface of the press head 22 is set as an inclined surface, when the press head 22 moves, the distance between a fixed point on the valve cover 20 below the press head 22 and the lower surface of the press head 22 continuously changes.

[0031] It further includes a diaphragm 30. The diaphragm 30 is arranged at the connection between the valve cover 20 and the valve body 10 to separate the space between the valve body 10 and the valve cover 20. The axis of the diaphragm 30 is perpendicular to the axis of the push block channel 21, so that the push block motor 23 is located on the side of the diaphragm 30. Even if solvents such as lubricating oil of the push block motor 23 drip due to gravity, they will not fall on the diaphragm 30 and cause pollution to the diaphragm 30. The diaphragm 30 is connected to the lower end of a diaphragm push rod 31. The upper end of the diaphragm push rod 31 is inserted into the push block channel 21 and abuts against the lower surface of the press head 22. As the press head 22 moves, the distance between the lower surface of the press head 22 and the valve cover 20 decreases, and the top of the diaphragm push rod 31 is pressed downward by the press head 22, driving the diaphragm 30 to abut against the valve seat 13 in the valve body 10, realizing the blocking of the liquid inlet 11 and the liquid outlet 12. Since the top end of the diaphragm push rod 31 only abuts against the press head 22, when the distance between the lower surface of the press head 22 and the valve cover 20 increases, the diaphragm push rod 31 will not automatically lift. Therefore, a reset member is arranged between the diaphragm push rod 31 and the valve cover 20. The reset member drives the diaphragm push rod 31 to lift, the diaphragm 30 rises, and the liquid inlet 11 and the liquid outlet 12 are communicated.

[0032] The working principle of the present invention is as follows:

[0033] Using the push block motor 23 to close the valve cover 20: Start the push block motor 23, convert the rotary motion into a linear motion, drive the press head 22 to move to the left along the push block channel 21. Due to the limitation of the push block channel 21, the moving direction of the press head 22 will not change. The distance between the lower surface of the press head 22 and the valve cover 20 at the diaphragm push rod 31 continuously decreases. Therefore, the diaphragm push rod 31 abutting against the lower surface of the press head 22 is pushed to move downward, and the diaphragm 30 abuts against the valve seat 13, closing the communication between the liquid inlet 11 and the liquid outlet 12, achieving the purpose of cutting off the fluid.

[0034] Open the valve cover 20 by using the push block motor 23: Start the reverse rotation of the push block motor 23, convert the rotary motion into a linear motion, drive the pressure head 22 to move rightward along the push block channel 21. The distance between the lower surface of the pressure head 22 and the valve cover 20 at the diaphragm ejector rod 31 continuously increases. Since the diaphragm ejector rod 31 is not connected to the pressure head 22, the pressure head 22 cannot drive the diaphragm ejector rod 31 to move upward. However, due to the reduced restriction of the pressure head 22 on the diaphragm ejector rod 31, the reset member can push the diaphragm ejector rod 31 to move upward, so that the diaphragm ejector rod 31 always abuts against the pressure head 22. Furthermore, the diaphragm 30 bends and separates from the valve seat 13 at the same time, and the liquid inlet 11 and the liquid outlet 12 are communicated, achieving the purpose of cleaning and opening the flow channel.

[0035] The driving element in the present invention is the push block motor 23, without the need to introduce an additional pressure air source, so the structure is simple and compact, and the volume is small. The push block motor 23 is located on the side of the diaphragm ejector rod 31. The direction in which the push block motor 23 is connected to the pressure head 22 is perpendicular to the diaphragm ejector rod 31, and the diaphragm ejector rod 31 realizes lifting through the movement of the pressure head 22. The pressure head 22 always blocks above the diaphragm ejector rod 31. Therefore, even if there is lubricating liquid in the push block motor 23, the liquid will not contact the diaphragm ejector rod 31, and will not flow through the valve cover 20 to the upper surface of the diaphragm 30. Thus, even if the diaphragm 30 is damaged, there will be no mutual contamination between the liquids. Also, since the diaphragm ejector rod 31 moves along the first inclined surface 221, if the first inclined surface 221 is a plane, the diaphragm ejector rod 31 may bounce relative to the pressure head 22 due to friction. Therefore, in this embodiment, the first inclined surface 221 is an arc-shaped inclined surface. And in order to reduce the friction between the diaphragm ejector rod 31 and the pressure head 22, the top of the diaphragm ejector rod 31 is a smooth arc surface.

[0036] In an embodiment of the present invention, in order to realize the drive of the push block motor 23 on the pressure head 22, a screw rod can be arranged in the push block channel 21, and the pressure head 22 is provided with a thread matching the screw rod. When the push block motor 23 drives the screw rod to rotate, the pressure head 22 can move along the axial direction of the screw rod to realize the movement of the pressure head 22. When it is inconvenient to install the screw rod in the push block channel 21 and it is relatively complicated to machine an internal thread in the pressure head 22, in order to simplify the structure of the diaphragm valve, in the present invention, the push block motor 23 is selected as a through-type linear motor, and the motor shaft 231 of the through-type linear motor can perform telescopic reciprocating motion. When the pressure head 22 is connected to the motor shaft 231 of the through-type linear motor, the pressure head 22 is driven to move.

[0037] Regardless of the driving method, as a mechanical device, the pusher motor 23 has certain vibrations during operation. After the vibrations are transmitted to the pressing head 22 through the screw or the motor shaft 231, the vibrations are amplified. Therefore, the pressing head 22 jitters within the pusher channel 21. In an embodiment of the present invention, the shape of the pusher channel 21 matches that of the pressing head 22. When the pusher motor 23 pushes the pressing head 22 to move, the pusher channel 21 guides the pressing head 22. However, at this time, when the pressing head 22 vibrates, the pressing head 22 continuously knocks on the valve cover 20, resulting in a large noise of the diaphragm valve and easy wear of the pressing head 22. Therefore, in the embodiment of the present invention, a pressure rod 24 is provided on one side of the valve cover 20 opposite to the diaphragm push rod 31. One end of the pressure rod 24 passes through the valve cover 20 and presses against the upper surface of the pressing head 22, and the other end extends into the adjusting member 25 and abuts against the adjusting spring 26 within the adjusting member 25. Since the pressing head 22 is clamped by the pressure rod 24 and the diaphragm push rod 31, the position of the pressing head 22 is restricted. Therefore, the pusher channel 21 may not match the shape of the pressing head 22 to restrict the position of the pressing head 22. At the same time, due to the existence of the adjusting spring 26, the adjusting spring 26 has a downward pressure on the pressure rod 24 and has a buffering effect. When the pressing head 22 trembles, the pressure rod 24 always contacts the pressing head 22 under the action of the adjusting spring 26, avoiding the noise generated by the pressing head 22 continuously hitting the pressure rod 24. Further, as the pressing head 22 moves, the pressing head 22 pushes the diaphragm 30 downward. At this time, a greater pressure needs to be applied to the diaphragm push rod 31. If the surface of the pressing head 22 in contact with the pressure rod 24 is a plane, then during the movement of the pressing head 22, the pressure of the pressure rod 24 on the pressing head 22 remains unchanged, which cannot meet the pressure requirement of the diaphragm push rod 31 on the diaphragm 30. Therefore, in this embodiment, the upper surface of the pressing head 22 is a second inclined surface 222 with an inclination direction opposite to that of its lower surface. As the pressing head 22 moves, the diaphragm push rod 31 is pushed downward, and at the same time, the pressure rod 24 is pushed upward, and the adjusting spring 26 is compressed. The adjusting spring 26 exerts a greater thrust on the pressure rod 24, and the thrust is transmitted to the diaphragm push rod 31 and the diaphragm 30 through the pressing head 22, meeting the pressure requirement of the diaphragm 30. When the pusher motor 23 pushes the pressing head 22 to move, the pressure rod 24 and the diaphragm push rod 31 are simultaneously pushed to approach or move away from each other, realizing the linkage of the pressing head 22, the pressure rod 24, and the diaphragm push rod 31.

[0038] In order to reset the diaphragm ejector rod 31, the reset member can be a reset spring. One end of the reset spring abuts against the valve cover 20, and the other end is connected to the diaphragm ejector rod 31. When the diaphragm ejector rod 31 is pressed down, the reset spring is compressed; when the indenter 22 moves in the reverse direction, the diaphragm ejector rod 31 tends to separate from the indenter 22, and the reset spring elongates, causing the diaphragm ejector rod 31 to rise and maintain the state of abutting against the indenter 22. However, on the one hand, when the diaphragm ejector rod 31 is a straight rod, it is not convenient to connect the reset spring to the diaphragm ejector rod 31. On the other hand, when the upper surface of the indenter 22 abuts against the ejector rod, if both sides on the upper side of the indenter 22 are elastic, the position of the indenter 22 in the up and down directions is likely to be unstable. Therefore, in this embodiment, the diaphragm ejector rod 31 is provided to include an ejector rod body 311 and an ejector rod head 312, and the diameter of the ejector rod head 312 is larger than the diameter of one end of the ejector rod body 311 connected thereto. Thus, if the reset member is a reset spring, the reset spring is sleeved on the ejector rod body 311, with one end abutting against the ejector rod head 312 and the other end abutting against the valve cover 20. In this embodiment, the reset member is an abutting seat 27. One end of the abutting seat 27 is connected to the indenter 22, and an avoidance groove 271 cooperating with the ejector rod body 311 is provided at the other end of the abutting seat 27. A reset channel 272 corresponding to the size of the ejector rod head 312 is formed between the abutting seat 27 and the first inclined surface 221. When the push block motor 23 drives the indenter 22 to move, the ejector rod body 311 moves in the avoidance groove 271. Since the size of the reset channel 272 corresponds to the size of the ejector rod head 312, the upper surface of the abutting seat 27 is an inclined surface. Since the size of the ejector rod head 312 is larger than that of the ejector rod body 311, the lower surface of the ejector rod head 312 can abut against the upper surface of the abutting seat 27. When the diaphragm ejector rod 31 descends, the first inclined surface 221 applies a downward pressure to the ejector rod head 312, and the diaphragm ejector rod 31 drives the diaphragm 30 to move downward. The diaphragm 30 abuts against the valve seat 13, closing the communication between the liquid inlet 11 and the liquid outlet 12. When the diaphragm ejector rod 31 ascends, the upper surface of the abutting seat 27 applies an upward thrust to the lower surface of the ejector rod head 312, and the diaphragm ejector rod 31 drives the diaphragm 30 to move upward. The diaphragm 30 bends and simultaneously separates from the valve seat 13, and the liquid inlet 11 and the liquid outlet 12 are communicated.

[0039] Refer to Figure 2As shown, the diaphragm 30 has a certain elasticity and is driven by the diaphragm push rod 31 to abut against or separate from the valve seat 13. Therefore, when the diaphragm push rod 31 applies force to the diaphragm 30 to deform it, the diaphragm 30 has a tendency to separate from the diaphragm push rod 31. To ensure the stable connection between the diaphragm 30 and the diaphragm push rod 31, an anti-disengagement head 313 is provided at the lower end of the diaphragm push rod 31. The cross-section of the anti-disengagement head 313 is in the shape of a "work" character, and the diaphragm 30 is injection-molded integrally with the anti-disengagement head 313. Due to the presence of the anti-disengagement head 313, when the diaphragm 30 is injection-molded with the anti-disengagement head 313, the diaphragm 30 can be directly clamped into the gap between the upper and lower ends of the "work"-shaped anti-disengagement head 313, so that the diaphragm 30 is not easily separated from the diaphragm push rod 31. Further, in this embodiment, in order to improve the sealing performance between the diaphragm 30 and the valve body 10, the cross-section of the diaphragm 30 is in the shape of an "H", that is, the diaphragm 30 is a circular sheet, and protrusions 32 are formed on both the upper and lower sides of the outer circumference of the diaphragm 30, so that the cross-section of the diaphragm 30 is in the shape of an "H". A groove 14 corresponding to the protrusion 32 on the lower surface of the diaphragm 30 is provided on the valve body 10, and the top of the protrusion 32 of the diaphragm 30 abuts against the lower surface of the valve cover 20. Thus, when the diaphragm 30 moves downward, the diaphragm 30 presses the valve body 10 and the valve seat 13 to block the liquid; when the diaphragm 30 moves upward, the middle part of the diaphragm 30 bulges upward, and the protrusion 32 below the diaphragm 30 still fills the groove 14, and the outer circumference of the diaphragm 30 still fits the valve body 10. At this time, there is no sanitary dead zone in the valve body 10 that is not easily cleaned. When flushing liquid is introduced into the valve body 10 for cleaning, the corners can be washed, and there will be no residue of other solutions. The protrusion 32 above the diaphragm 30 abuts against the valve cover 20, so that there is enough space for the diaphragm 30 to move upward between the upper surface of the middle part of the diaphragm 30 and the valve cover 20. Further, to better achieve the control of the flow rate and opening and closing, the valve seat 13 that separates the liquid inlet 11 and the liquid outlet 12 in the valve body 10 is arranged offset from the center of the diaphragm 30. And both the diaphragm 30 and the valve body 10 are made of medical-grade materials, which better meet the sanitary requirements.

[0040] Since there is a space for the diaphragm 30 to move between the valve cover 20 and the diaphragm 30, and the diaphragm push rod 31 passes through the valve cover 20, the valve cover 20 guides the movement of the diaphragm push rod 31. For the convenience of processing and installation, in the preferred embodiment of the present invention, the valve cover 20 includes a cover cylinder 28 and a limiting member 29. Setting the valve cover 20 into two parts reduces the difficulty of processing as a whole, and the two parts are convenient to assemble. Specifically, the cover cylinder 28 is provided with a mounting hole corresponding to the position of the valve body 10, the limiting member 29 is inserted into the mounting hole, the limiting member 29 is provided with a limiting hole matching the diameter of the diaphragm push rod 31, the outer periphery of the lower surface of the limiting member 29 abuts against the valve body 10, and an activity space is formed between the middle of the limiting member 29 and the valve body 10. Due to the setting of the limiting member 29, the distance between the lower surface of the pressing head 22 and the valve cover 20, specifically, the limiting member 29 is small, which is convenient for the abutting member to abut against the limiting member 29.

[0041] When the present invention is working, the diaphragm valve is in an open state, the middle part of the diaphragm 30 bulges upward and separates from the valve seat 13, the liquid inlet 11 and the liquid outlet 12 are communicated, and the diaphragm push rod 31 rises to correspond to the upper end of the first inclined surface 221 under the holding of the abutting seat 27 and the limitation of the limiting hole, the position of the pressing rod 24 corresponds to the position of the diaphragm push rod 31, and the lower end of the second inclined surface 222 of the abutting pressing head 22. When it is necessary to close the diaphragm valve, the push block motor 23 is started, and the motor shaft 231 drives the pressing block to move Figure 1 to the left in the middle. The lower end of the first inclined surface 221 of the pressing head 22 corresponds to the diaphragm push rod 31, and the upper end of the second inclined surface 222 of the pressing head 22 corresponds to the pressing rod 24, that is, the pressing rod 24 and the diaphragm push rod 31 are respectively pushed to move upward and downward, so that the pressing head 22 always maintains a position in the same straight line as the motor shaft 231. As the diaphragm push rod 31 moves downward, the middle part of the diaphragm 30 is pressed downward and abuts against the valve seat 13, realizing the closing of the communication between the liquid inlet 11 and the liquid outlet 12. The structural design of the present invention has no dead angle and is convenient for cleaning. It is suitable for applications in industries such as biopharmaceuticals and food and beverage. Moreover, it adopts a motor reciprocating drive mode, a pure mechanical design, with a simple and compact structure, small volume and high efficiency.

[0042] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. An electric sanitary diaphragm valve, characterized in that, Comprising: A valve body, on which a liquid inlet and a liquid outlet are provided; A valve cover, which is connected to the valve body. A push block channel is provided inside the valve cover. A pressure head is arranged in the push block channel. One end of the push block channel is provided with a push block motor, and the push block motor drives the pressure head to reciprocate axially along the push block channel. The lower surface of the pressure head is set as a first inclined surface; A diaphragm, which is arranged at the connection between the valve cover and the valve body. The diaphragm is connected to the lower end of a diaphragm ejector rod. The upper end of the diaphragm ejector rod is inserted into the push block channel and abuts against the lower surface of the pressure head. A reset member is arranged between the diaphragm ejector rod and the valve cover; The diaphragm ejector rod includes a rod body and a rod head. The diameter of the rod head is larger than the diameter of one end of the rod body connected thereto. The reset member is an abutting seat. One end of the abutting seat is connected to the pressure head, and the other end is provided with an avoidance groove matching the rod body. A reset channel corresponding to the size of the rod head is formed between the abutting seat and the first inclined surface.

2. The electric sanitary diaphragm valve according to claim 1, wherein A pressure rod is arranged on one side of the valve cover opposite to the diaphragm ejector rod. One end of the pressure rod passes through the valve cover and presses against the upper surface of the pressure head, and the other end extends into an adjusting member and abuts against an adjusting spring in the adjusting member.

3. The electric sanitary diaphragm valve according to claim 2, characterized in that, The upper surface of the pressure head is a second inclined surface with an inclination direction opposite to that of its lower surface.

4. An electric sanitary diaphragm valve according to claim 1, characterized in that, The lower end of the diaphragm ejector rod is provided with an anti - detachment head, and the cross - section of the anti - detachment head is in the shape of "I". The diaphragm and the anti - detachment head are injection - molded as a whole.

5. An electric sanitary diaphragm valve according to claim 1, characterized in that, The cross - section of the diaphragm is in the shape of "H". The valve body is provided with a groove corresponding to the protrusion on the lower surface of the diaphragm.

6. An electric sanitary diaphragm valve according to claim 1, wherein, The push block motor is a through - type linear motor, and the motor shaft of the push block motor is fixedly connected to the pressure head.

7. An electric sanitary diaphragm valve according to claim 1, characterized in that, The valve cover includes a cover cylinder and a limiting member. The cover cylinder is provided with a mounting hole corresponding to the valve body. The limiting member is inserted into the mounting hole. A limiting hole matching the diameter of the diaphragm ejector rod is arranged in the limiting member. The outer periphery of the lower surface of the limiting member abuts against the valve body, and an activity space is formed between the middle part of the limiting member and the valve body.

8. An electric sanitary diaphragm valve according to claim 1, characterized in that, The valve seat in the valve body that separates the liquid inlet and the liquid outlet is arranged deviating from the center of the diaphragm.

9. The electric sanitary diaphragm valve according to claim 1, wherein, The first inclined surface is an arc - shaped inclined surface, and the top of the diaphragm ejector rod is a smooth arc surface.

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