Pneumatic diaphragm valve

Abstract

The utility model relates to the technical field of diaphragm valves, in particular to a pneumatic diaphragm valve, which comprises a valve seat, a diaphragm valve core, a diaphragm valve core and a diaphragm valve core, the diaphragm is arranged on the valve seat and is used for controlling the circulation of a medium; the pneumatic mechanism comprises a pneumatic control port, a valve rod making contact with the diaphragm and a first elastic piece abutting against the valve rod. The valve rod is configured in the mode that the diaphragm is pressed on the end face of the valve seat under the pressure of air entering the air control port, so that a medium cannot flow to the medium outlet from the medium inlet, and when the acting force of the first elastic piece is larger than that of the air, the valve rod is lifted, the gap between the diaphragm and the valve seat is enlarged, and the medium flows to the medium outlet from the medium inlet. Compared with the prior art, the pneumatic control valve has the advantages that the movement of the valve rod is controlled through air inlet of the pneumatic control port, the state of the diaphragm is changed through the first elastic piece, so that medium circulation is controlled, the valve seat and the pneumatic mechanism are separated by the diaphragm, and damage to parts of the pneumatic mechanism is avoided while the pneumatic control mode is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of diaphragm valves, in particular to a pneumatic diaphragm valve. Background Art

[0002] The diaphragm valve is a shut-off valve. Its main feature is that it uses a diaphragm as an opening and closing member to close the flow channel, cut off the fluid, and separate the inner cavity of the valve body from the inner cavity of the valve cover.

[0003] In the related technology, electric diaphragm valves are often used to make diaphragm valves operate automatically. However, in different working environments, for example, electric diaphragm valves may generate noise during operation, or some special media may corrode and damage the materials and seals of electric diaphragm valves. It is necessary to select materials and sealing methods for special media, which may increase costs. Sometimes, in special environments, some diaphragm valves cannot operate normally, affecting working conditions.

[0004] The electric diaphragm valve with an integrated design has parts that are in direct contact with the medium, and it is impossible to avoid leakage and sticking caused by a series of reasons such as corrosion. In addition, it is difficult to replace the diaphragm, which increases the maintenance cost. Utility Model Content

[0005] In view of at least one of the above technical problems, the utility model provides a pneumatic diaphragm valve, which adopts structural improvement to improve the performance and reliability of the diaphragm valve.

[0006] According to a first aspect of the utility model, there is provided a pneumatic diaphragm valve, comprising:

[0007] A valve seat, wherein a medium inlet and a medium outlet are arranged in the valve seat;

[0008] A pneumatic mechanism, the pneumatic mechanism comprising an air control port, a valve stem in contact with the diaphragm, and a first elastic member abutting against the valve stem, wherein a valve body shell is sleeved on the outer side of the valve stem;

[0009] The diaphragm is arranged between the valve seat and the pneumatic mechanism, and is used to control the connection or isolation between the medium inlet and the medium outlet, and change the opening and closing degree of the valve to control the circulation of the medium;

[0010] Wherein, the valve stem is configured to press the diaphragm against the end surface of the valve seat under the pressure of the gas entering the air control port, so that the medium cannot flow from the medium inlet to the medium outlet, and when the force of the first elastic member is greater than the force of the gas, the valve stem moves in a direction away from the valve seat, the gap between the diaphragm and the valve seat becomes larger, the medium inlet and the medium outlet are connected, and the medium flows from the medium inlet to the medium outlet.

[0011] In some embodiments of the present invention, the valve stem includes a gas stem, and the gas stem is configured so that a protruding portion of the gas stem contacts an inner wall of the gas control port.

[0012] In some embodiments of the utility model, the pneumatic mechanism includes a gear, the gear is a half gear, the arc portion of the gear is a convex circle, the inside of the gas rod of the gear is processed with a tooth groove that meshes with the gear, and the gear includes a pin shaft and a bearing sleeve.

[0013] In some embodiments of the present invention, the valve stem includes a roller, the roller includes a bearing pin arranged at the center of the roller, and the roller is in contact with the arc portion of the gear.

[0014] In some embodiments of the utility model, the valve stem includes a push rod, the bottom of the push rod is in contact with the diaphragm, a protruding portion is processed on the end of the push rod away from the diaphragm, the protruding portion is sleeved with a base, the other side of the base is in contact with the diaphragm, an intermediate rod is provided at the end of the push rod away from the diaphragm and close to the roller, a second elastic member is sleeved on one end of the intermediate rod facing the push rod, and the other end of the second elastic member abuts against the base.

[0015] In some embodiments of the present invention, an intermediate joint is provided between the valve stem and the valve seat.

[0016] In some embodiments of the utility model, a valve bracket is provided on the outer ring of the intermediate joint, an end face plug is provided in the notch provided at the outer end of the valve bracket, and a spring gasket is provided between the first elastic member and the valve bracket.

[0017] In some embodiments of the utility model, a valve body shell is sleeved on the outer side of the valve bracket, and a support belt and a sealing ring are arranged on the inner side of the valve body shell.

[0018] In some embodiments of the present invention, the size of the medium outlet in the valve seat is configured to be smaller than the size of the medium inlet.

[0019] In some embodiments of the present invention, the diaphragm is bowl-shaped, and the diaphragm opening is arranged toward the valve seat.

[0020] The beneficial effects of the utility model are as follows: the utility model controls the movement of the valve stem through the air control port and changes the state of the diaphragm with the first elastic member, thereby controlling the flow of the medium in the gap between the diaphragm and the valve seat, and the valve seat and the pneumatic mechanism are separated by the diaphragm, thereby realizing the air control operation mode, avoiding damage to the parts of the pneumatic mechanism and saving maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the structure of the pneumatic diaphragm valve in the embodiment of the utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the diaphragm in the embodiment of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the valve seat in the embodiment of the utility model;

[0025] Figure 4 This is a structural state diagram of the pneumatic diaphragm valve in the embodiment of the utility model when the valve is open;

[0026] Figure 5 This is a structural state diagram of the pneumatic diaphragm valve in the embodiment of the utility model when the valve is closed;

[0027] Figure 6 This is a schematic diagram of the structure of the gas rod in the embodiment of the utility model;

[0028] Figure 7 This is a schematic diagram of the structure of the intermediate joint in the embodiment of the utility model;

[0029] Figure 8 This is a schematic diagram of the structure of the valve bracket in the embodiment of the utility model;

[0030] Fig. 9 It is a structural schematic diagram of the valve body shell in an embodiment of the utility model. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0032] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0034] like Figures 1 to 9 The pneumatic diaphragm valve shown in the figure comprises: a valve seat 1, a diaphragm 2 and a pneumatic mechanism 3; a medium inlet 11 and a medium outlet 12 are arranged in the valve seat 1, as shown in FIG. Figure 2 and Figure 3 As shown in ; It should be pointed out here that the medium can be gas, liquid, high viscosity fluid and suspension and other media. Diaphragm valves are widely used in various scenarios and have strong applicability.

[0035] The pneumatic mechanism 3 includes an air control port 31, a valve stem 32, and a first elastic member 33 abutting against the valve stem 32; when compressed air enters the pneumatic mechanism 3 through the air control port 31, the compressed air pushes the valve stem 32 to move, and the movement of the valve stem 32 will change the opening and closing degree of the valve, thereby controlling the flow of the medium. At the same time, the first elastic member 33, which can be an elastic device such as a spring, plays a role in providing a reset force or a holding force in the pneumatic mechanism 3, thereby assisting in opening or closing the valve. It should be pointed out here that the transmission in the pneumatic mechanism 3 can be through a gear rack method, or through a connecting rod transmission, etc. The specific transmission method is selected by technical personnel in this field according to needs; the outer side of the valve stem 32 is provided with a valve body shell 38, and the valve body shell 38 serves as an external protective layer of the valve, which can prevent dust, moisture, corrosive substances, etc. from the external environment from entering the interior of the valve, thereby protecting the internal components from damage, and the valve body shell 38 provides additional structural support for the valve;

[0036] The diaphragm 2 is arranged between the valve seat 1 and the pneumatic mechanism 3, and is used to control the connection or isolation between the medium inlet 11 and the medium outlet 12, and change the opening and closing degree of the valve to control the flow of the medium; Figure 2For example, when the diaphragm 2 is away from the valve seat 1, the medium can flow, and when the diaphragm 2 is close to the valve seat 1, the medium cannot flow; the diaphragm 2 is stamped from stainless steel and has elasticity. The thickness, shape and size of the diaphragm 2 can be accurately controlled through the stamping process, and its elasticity can be increased by designing the diaphragm 2 with corrugations, folds or special shapes. This design allows the diaphragm 2 to deform when it is under pressure and return to its original shape or close to its original shape after the pressure is released; and the stainless steel material can withstand high pressure and has good corrosion resistance; in situations where precise control of fluid flow or pressure is required, the elastic design of the stainless steel diaphragm 2 can achieve more precise adjustments, such as changing the thickness, shape, length, etc. of the diaphragm 2 to change the flow of the valve.

[0037] Among them, such as 4 and Figure 5 As shown in FIG. 1 , the valve stem 32 is configured to press the diaphragm 2 against the end surface of the valve seat 1 under the pressure of the gas entering the gas control port 31, so that the medium cannot flow from the medium inlet 11 to the medium outlet 12, as shown in FIG. Figure 4 As shown in , when the force of the first elastic member 33 is greater than the force of the gas, the valve stem 32 moves away from the valve seat 1, the gap between the diaphragm 2 and the valve seat 1 becomes larger, the medium inlet 11 and the medium outlet 12 are connected, and the medium flows from the medium inlet 11 to the medium outlet 12. Figure 5 As shown in , the force exerted by the valve stem 32 on the diaphragm 2 causes the diaphragm 2 to form a seal directly with the valve seat 1, effectively blocking the passage of the medium from the medium inlet 11 to the medium outlet 12. This direct sealing method reduces the possibility of leakage. Since the valve seat 1 and the pneumatic mechanism 3 are effectively isolated by the diaphragm 2, the medium cannot directly contact these pneumatic components, which avoids the corrosion and wear of the pneumatic mechanism 3 by the medium, thereby extending the service life of the pneumatic mechanism 3 and reducing the overall maintenance cost; and since the valve seat 1 and the pneumatic mechanism 3 are independent of each other, and the diaphragm 2 is located between the two, the overall structure of the diaphragm valve is simple, and no professional tools are required, which is simpler than replacing the diaphragm 2 in a traditional diaphragm valve; since the sealing structure between the diaphragm 2 and the valve seat 1 does not depend on the properties of the medium, such as corrosiveness, viscosity, etc., the pneumatic control valve of this design can adapt to many different types of media.

[0038] In some embodiments of the present invention, please refer to Figure 1 The valve stem 32 includes a gas stem 32a, and the gas stem 32a is configured such that the protruding portion of the gas stem 32a contacts the inner wall of the gas control port 31. The protruding portion of the gas stem 32a contacts the inner wall of the gas control port 31, and this design can ensure the sealing between the gas control port 31 and the valve stem 32; when gas enters through the gas control port 31, it can more effectively apply pressure to the gas stem 32a; the contact between the gas stem 32a and the inner wall of the gas control port 31 also provides additional stability, which helps prevent the valve stem 32 from deflecting or shaking under the action of gas pressure.

[0039] In some embodiments of the present invention, please refer to Figure 1 , Figures 4 to 6 The pneumatic mechanism 3 includes a gear 34, which is a half gear. The arc portion of the gear 34 is convex. The gas rod 32a is processed with a tooth groove meshing with the gear 34. The gear 34 includes a pin shaft 34a and a bearing sleeve 34b. The specific operation steps of the gear 34 are as follows: when compressed air enters the pneumatic mechanism 3, the gas rod 32a is pushed to produce linear motion. The tooth groove inside the gas rod 32a meshes with the teeth of the half gear 34, converting the linear motion of the gas rod 32a into the rotational motion of the gear 34. The smooth convex arc surface of the gear 34 pushes other mechanisms, and through the support and fixing of the pin shaft 34a and the bearing sleeve 34b, the gear 34 can stably rotate and drive other mechanisms.

[0040] In order to better improve the transmission accuracy and reduce the friction, in some embodiments of the present utility model, Figure 1 As shown in , the valve stem 32 includes a roller 32b, the roller 32b includes a bearing pin 32b1 set at the center of the roller 32b, and the roller 32b contacts the arc portion of the gear 34. The contact between the roller 32b and the arc portion of the gear 34 converts the original possible sliding friction into rolling friction, and the resistance of rolling friction is much smaller than that of sliding friction, so it can significantly reduce energy loss and also help to extend the service life of the gear 34 and the roller 32b.

[0041] In some embodiments of the present invention, Figure 1 As shown in, the valve stem 32 includes a push rod 32c, the bottom of which is in contact with the diaphragm 2 for transmitting force or displacement to the diaphragm 2; a protruding portion is processed at one end of the push rod 32c away from the diaphragm 2, and a base 35 is sleeved on the protruding portion. The base 35 limits the moving distance of the push rod 32c. Through such a setting, the moving distance of the push rod 32c can be accurately controlled, thereby accurately controlling the opening and closing degree of the valve; the other side of the base 35 is in contact with the diaphragm 2 for increasing the support area of ​​the diaphragm 2 and improving the sealing performance or stability; an intermediate rod 32d is provided at one end of the push rod 32c away from the diaphragm 2 and close to the roller 32b, and a second elastic member 36 is sleeved on one end of the intermediate rod 32d facing the push rod 32c, and the other end of the second elastic member 36 abuts against the base 35, so that the second elastic member 36 can provide elastic support or buffering between the push rod 32c and the base 35 to protect the diaphragm 2 from damage.

[0042] In some embodiments of the present invention, Figure 5 and Figure 7As shown in FIG. 1 , in some embodiments of the present invention, an intermediate joint 4 is provided between the valve stem 32 and the valve seat 1. In the application of certain special media, such as corrosive, high-temperature or high-pressure media, the intermediate joint 4 can play an isolating role and protect the valve stem 32 and the valve seat 1 from being corroded by the media. It should be pointed out here that the intermediate joint has a variety of structural forms, which can be Figure 7 The structure has slots in the middle and the upper and lower parts, and is used to connect with the valve seat 1 at one end and the pneumatic mechanism 3 at the other end.

[0043] In some embodiments of the present invention, Figure 5 and Figure 8 As shown in FIG, the outer ring of the intermediate joint 4 is provided with a valve support 37, the notch provided at the outer end of the valve support 37 is provided with an end face plug, and a spring gasket 33a is provided between the first elastic member 33 and the valve support 37. It should be noted here that, as Figure 8 As shown in , the valve bracket 37 has a raised portion that can be engaged with other components to ensure connection stability. The valve bracket 37 provides a stable support for the intermediate joint 4, which helps prevent the intermediate joint 4 from being displaced or loosened during the operation of the valve; please continue to refer to Figure 8 As shown in the figure, the end face plug is used for the sealing groove 37a of the valve bracket 37. The bottom end of the valve bracket has several sealing grooves 37a, which are made of elastic material. It should be pointed out here that the elastic material can be rubber material, tetrafluoroethylene, polyurethane and other materials, which can be set by technical personnel in this field as required; the spring gasket is located between the first elastic member 33 and the valve bracket 37, which can absorb and disperse vibration and impact, and protect the first elastic member 33 and the valve bracket 37 from damage. By adjusting the thickness or material of the spring gasket, the preload force of the first elastic member 33 can be fine-tuned, thereby optimizing the performance of the valve.

[0044] In some embodiments of the present invention, Figure 8 and Fig. 9 As shown in , the valve body shell 38 is sleeved on the outside of the valve bracket 37. It should be pointed out that the valve body shell 38 is equipped with a buckle, which is connected to other parts such as the valve bracket 37. The inner side of the valve body shell 38 is provided with a support belt 5 and a sealing ring 6. The support belt 5 is used to position and support the valve bracket 37. The support belt 5 can disperse the stress and torque transmitted by the valve bracket 37 to prevent the valve body shell 38 from being deformed or broken due to excessive local stress. The sealing ring 6 fits tightly in the valve body shell 38 and is made of elastic material. It has a certain buffering and shock absorbing effect and can absorb and disperse the vibration and impact generated during the opening and closing of the valve. It should be pointed out that during the operation of the diaphragm valve, due to changes in factors such as temperature and pressure, the working parts will undergo slight deformation. The sealing ring 6 has a certain elastic deformation ability and can adapt to these changes and maintain a good sealing effect.

[0045] In some embodiments of the present invention, Figure 1 As shown in the figure, the medium outlet 12 in the valve seat 1 is configured to be smaller than the medium inlet 11. When the medium flows in from the larger inlet and flows out through the smaller medium outlet 12, the flow rate will increase and the pressure will decrease. It should be pointed out here that in some working conditions, in order to prevent the medium from flowing back after the valve is closed, the medium outlet 12 will be designed to be smaller than the medium inlet 11 to increase the resistance to fluid backflow.

[0046] In some embodiments of the present invention, Figure 1 As shown in the figure, the diaphragm 2 is in a bowl shape, and the opening of the diaphragm 2 is arranged toward the valve seat. The bowl-shaped design of the diaphragm 2 can better disperse the fluid pressure, reduce the wear of the diaphragm 2, increase the strength and stability of the diaphragm 2, and provide better sealing and stability; the diaphragm 2 is configured to open toward the valve seat, so that when the valve is closed, the opening of the diaphragm 2 is in close contact with the valve seat 1 to form a seal, and when the valve is closed, the fluid will not leak from the gap between the diaphragm 2 and the valve seat 1.

[0047] Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the description are only for explaining the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A pneumatic diaphragm valve, characterized in that: include: A valve seat, wherein a medium inlet and a medium outlet are arranged in the valve seat; A pneumatic mechanism, the pneumatic mechanism comprising an air control port, a valve stem and a first elastic member abutting against the valve stem, and a valve body shell is sleeved on the outer side of the valve stem; A diaphragm, the diaphragm is arranged between the valve seat and the pneumatic mechanism, and is used to control the connection or isolation between the medium inlet and the medium outlet; Wherein, the valve stem is configured to press the diaphragm against the end surface of the valve seat under the pressure of the gas entering the air control port, so that the medium cannot flow from the medium inlet to the medium outlet. When the force of the first elastic member is greater than the force of the gas, the valve stem moves in a direction away from the valve seat, the gap between the diaphragm and the valve seat becomes larger, the medium inlet and the medium outlet are connected, and the medium flows from the medium inlet to the medium outlet.

2. The pneumatic diaphragm valve according to claim 1, characterized in that: The valve stem includes a gas stem, and the gas stem is configured such that a protruding portion of the gas stem contacts an inner wall of the gas control port.

3. The pneumatic diaphragm valve according to claim 2, characterized in that: The pneumatic mechanism comprises a gear, which is a half gear. The arc portion of the gear is convex. A tooth groove meshing with the gear is processed inside the gas rod of the gear. The gear comprises a pin shaft and a bearing sleeve.

4. The pneumatic diaphragm valve according to claim 3, characterized in that: The valve stem includes a roller, the roller includes a bearing pin arranged at the center of the roller, and the roller contacts the circular arc portion of the gear.

5. The pneumatic diaphragm valve according to claim 4, characterized in that: The valve stem includes a push rod, the bottom of which is in contact with the diaphragm, a protruding portion is processed on one end of the push rod away from the diaphragm, a base is mounted on the protruding portion, and the other side of the base is in contact with the diaphragm, an intermediate rod is provided on one end of the push rod away from the diaphragm and close to the roller, a second elastic member is mounted on one end of the intermediate rod facing the push rod, and the other end of the second elastic member abuts against the base.

6. The pneumatic diaphragm valve according to claim 1, characterized in that: An intermediate joint is arranged between the valve stem and the valve seat.

7. The pneumatic diaphragm valve according to claim 6, characterized in that: The outer ring of the intermediate joint is provided with a valve bracket, a notch provided at the outer end of the valve bracket is provided with an end face plug, and a spring gasket is provided between the first elastic member and the valve bracket.

8. The pneumatic diaphragm valve according to claim 7, characterized in that: The outer side of the valve bracket is covered with a valve body shell, and the inner side of the valve body shell is provided with a support belt and a sealing ring.

9. The pneumatic diaphragm valve according to claim 1, characterized in that: The size of the medium outlet in the valve seat is configured to be smaller than the size of the medium inlet.

10. The pneumatic diaphragm valve according to claim 1, characterized in that: The diaphragm is in a bowl shape, and the diaphragm opening is arranged toward the valve seat.

Images