Pneumatic pipe clamp valve and valve system

Abstract

The utility model relates to a pneumatic pipe clamp valve and a valve system, which comprise a valve body and a through-flow hose inserted in the valve body, pneumatic chambers are arranged in the middle of the valve body, the pneumatic chambers are arranged in pairs and are symmetrical along the central axis of the through-flow hose, a valve core is arranged in each pneumatic chamber, and the valve core is connected with the through-flow hose. Air pressure change in the pneumatic cavity can drive the valve element to act so as to clamp or loosen the open-flow hose, and therefore the valve body can be opened or closed. The device is exquisite in structural design and low in operation and maintenance cost.

Description

Technical Field

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

[0002] A pipe clamp valve, also known as a pinch valve, bladder valve or pinch-off valve, etc., is widely used in various conveying pipelines. According to the driving mode, pipe clamp valves can be divided into manual pipe clamp valves, pneumatic pipe clamp valves, electric pipe clamp valves and hydraulic pipe clamp valves, etc., among which pneumatic pipe clamp valves are the most common.

[0003] Traditional pneumatic pinch valves require complex pneumatic control systems and have high operation and maintenance costs; for this reason, technicians have designed a pneumatic pipe clamp valve to solve the above problems. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a pneumatic pipe clamp valve and a valve system with delicate structure design and low operation and maintenance costs.

[0005] The technical solution adopted by the utility model to solve its technical problem is: a pneumatic pipe clamp valve, including a valve body and a flow-through hose inserted into the valve body. An air chamber is provided in the middle of the valve body. The air chambers are arranged in pairs and symmetrically along the central axis of the flow-through hose. A valve core is provided in the air chamber. The change of air pressure in the air chamber can drive the valve core to act to clamp or loosen the flow-through hose, so as to realize the on-off of the valve body.

[0006] Furthermore, an end cover is provided outside the valve core, and the end cover is fixedly connected to the valve body; a control port is provided on the end cover.

[0007] Furthermore, the valve core is installed on the valve body through a valve core seat, and the valve core seat has a through hole, and the valve core can move in the through hole.

[0008] Furthermore, a diaphragm is provided in the air chamber. One end of the valve core is fixedly connected to the diaphragm, and the other end can move in the valve body seat; the diaphragm divides the air chamber into two air chambers that do not communicate with each other. The pressure difference formed by the two air chambers can drive the diaphragm to deform, so as to drive the valve core to act to loosen the flow-through hose, thus realizing valve opening.

[0009] Furthermore, a spring is provided between the diaphragm and the end cover, and the diaphragm can squeeze the spring when deforming and moving upward.

[0010] Furthermore, the diaphragm and the end cover are hermetically connected to form a first air chamber, and the first air chamber communicates with the control port.

[0011] Furthermore, the valve core seat is also provided with air holes.

[0012] The present utility model also provides a valve system, including the above-mentioned pinch valve.

[0013] The beneficial effects of the present utility model are as follows:

[0014] 1. The present utility model realizes the opening and closing of the pinch valve through pneumatic control by setting a diaphragm, a spring, a valve core and a valve core seat, with delicate design, compact structure and low operation and maintenance costs;

[0015] 2. By setting air holes on the valve core seat, the present utility model can help the flow-through hose recover its deformation to a circular shape when the pinch valve is opened, improving the water pumping volume.

[0016] 3. Compared with the prior art, the present utility model can be started with a smaller vacuum negative pressure. Description of the Drawings

[0017] Figure 1 is the structural schematic of the present utility model Figure 1 (Valve shut-off);

[0018] Figure 2 is the structural schematic of the present utility model Figure 2 (Valve on).

[0019] In the figure:

[0020] Pinch valve 1, valve body 11, flow-through hose 12, two groups of pneumatic chambers (131, 132), first air chamber 133, second air chamber 134, valve core 14, valve core disc 141, end cover 15, control port 151, valve core seat 16, air hole 161, diaphragm 17, working chamber 18, spring 19. Detailed Embodiments

[0021] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0022] Embodiment 1:

[0023] As Figure 1 - Figure 2A pneumatic pipe clamp valve 1 is shown, comprising a valve body 11 and a flow hose 12 inserted in the valve body, a pneumatic chamber is provided in the middle of the valve body, and two groups of pneumatic chambers are provided. The two groups of pneumatic chambers (131, 132) are symmetrically arranged along the central axis of the flow hose, and valve cores 14 are provided in both groups of pneumatic chambers. When the two groups of valve cores are close to each other to clamp the flow hose, the valve is closed, and when the two groups of valve cores are away from each other to release the clamping, the valve is opened; the air pressure change in the pneumatic chamber can drive the valve core to approach or move away to clamp or release the flow hose, thereby realizing the on-off of the valve body;

[0024] An end cover 15 is disposed outside the valve core, the end cover is fixedly connected to the valve body, and a control port 151 is disposed on the end cover.

[0025] The valve core is installed on the valve body through the valve core seat 16. The middle of the valve core seat has a through hole (not shown in the figure), and the valve core can move in the through hole.

[0026] A diaphragm 17 is provided in the pneumatic chamber, and the diaphragm is sealed and connected to the end cover 15. One end of the valve core is fixedly connected to the diaphragm through a valve core disk 141, and the other end can move in the valve body seat; the diaphragm divides the pneumatic chamber into two air chambers that are not connected to each other. The air pressure difference formed by the two air chambers can drive the diaphragm to deform, so as to drive the valve core to move and loosen the flow hose, thereby opening the valve; specifically in this embodiment, the diaphragm is sealed and connected to the end cover to form a first air chamber 133, and the diaphragm and the valve core seat form a second air chamber 134. The first air chamber and the second air chamber are not connected to each other. The space formed between the inner wall of the valve body and the valve core seat is a working chamber 18, the flow hose is arranged in the working chamber and its two ends pass through the valve body. A spring 19 is provided in the first air chamber, and the valve core is arranged in the second air chamber and its end passes through the second air chamber and moves in the working chamber to squeeze the flow hose.

[0027] The first air chamber is connected to the control port. When vacuum negative pressure is applied to the control port, the first air chamber is filled with vacuum negative pressure, and an air pressure difference is generated between the first air chamber and the second air chamber. The diaphragm is deformed and concave toward the first air chamber due to the vacuum negative pressure, driving the valve core to move upward, opening the valve, and connecting the two ends of the flow hose. A spring is provided between the diaphragm and the end cover. When the diaphragm is deformed and moves upward, the spring is squeezed. When normal air pressure is applied to the control port, the first air chamber is gradually filled with air, and the air pressure difference between the first air chamber and the second air chamber gradually decreases to air pressure balance. Under the combined action of the air pressure difference and the reaction force of the spring, the diaphragm slowly moves downward to clamp the flow hose, that is, the valve is closed, and the two ends of the flow hose are not connected.

[0028] In the prior art, when the two valve cores of the pipe clamp valve are loosened to clamp the flow hose, that is, when the valve is opened, the flow hose is difficult to return to the round tube, and the tube wall will be dented, which will reduce the flow cross-sectional area of ​​the flow hose and reduce the unit water pumping volume at the same flow rate, thereby affecting the water pumping effect. For this reason, the valve core seat is also provided with an air hole 161, which is used to connect the working chamber and the second air chamber. When the control port applies vacuum negative pressure, the diaphragm drives the valve core to move upward. Due to the existence of the air hole (the end cover and the valve body are not sealed), the vacuum suction force will be transmitted to the flow hose, sucking the flow hose into the round tube (the cross-section of the flow hose is circular), the flow cross-sectional area of ​​the flow hose remains unchanged, and the unit water pumping volume at the same flow rate remains unchanged. Compared with the hose with a dented tube wall in the prior art, the flow rate of the flow hose in this embodiment is large.

[0029] In the prior art, the normal starting pressure of the pneumatic clamp valve is 2 kg, and the absolute vacuum negative pressure is 1 kg. The higher the starting pressure of the pneumatic clamp valve, the stricter the requirements for the entire vacuum system (the vacuum negative pressure of the vacuum station, the amount of vacuum transmission loss). Considering the driving force of the diaphragm driven by the air pressure, the compression force of the spring that the valve core disk needs to overcome when the diaphragm moves upward, etc., therefore, when the starting clamp valve in this embodiment is actually produced, the specifications of the spring (length, diameter, number of turns, etc.), the material of the diaphragm (deformation coefficient), and the area of ​​the valve core disk are comprehensively considered and calculated, so that the normal starting pressure of the starting clamp valve in this embodiment is only 0.15 kg.

[0030] The action process of this embodiment is:

[0031] When vacuum negative pressure is applied to the control port, the first air chamber is filled with vacuum negative pressure, and a pressure difference is formed between the first air chamber and the second air chamber. The diaphragm is deformed into the first air chamber due to the vacuum negative pressure, driving the valve core to move upward and squeezing the spring at the same time, the valve opens, and the two ends of the flow hose are connected; when normal air pressure is applied to the control port, the first air chamber is gradually filled with air, and the pressure difference between the first air chamber and the second air chamber gradually decreases. Under the combined action of the pressure difference and the reaction force of the spring, the diaphragm slowly moves downward to clamp the flow hose, the valve is closed, and the two ends of the flow hose are not connected; since the valve core seat is provided with an air hole, when the valve core releases the flow hose, the flow hose will be sucked back to the round tube, and the tube wall will not be dented.

[0032] Embodiment 2: A valve system, comprising the pipe clamp valve 1 in Embodiment 1.

[0033] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "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 utility model 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. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0034] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations. In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0035] It should be emphasized that the above are only the preferred embodiments of the present utility model, and there is no limitation in any form to the present utility model. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A pneumatic pipe clamp valve, characterized in that: It includes a valve body and a flow hose inserted in the valve body, a pneumatic chamber is provided in the middle of the valve body, the pneumatic chambers are arranged in pairs and are symmetrical along the central axis of the flow hose, a valve core is provided in the pneumatic chamber, and the air pressure change in the pneumatic chamber can drive the valve core to clamp or loosen the flow hose, thereby realizing the opening and closing of the valve body.

2. The pneumatic clamp valve according to claim 1, characterized in that: An end cover is arranged outside the valve core, and the end cover is fixedly connected to the valve body; a control port is arranged on the end cover.

3. The pneumatic clamp valve according to claim 2, characterized in that: The valve core is installed on the valve body through a valve core seat. The valve core seat has a through hole, and the valve core can move in the through hole.

4. The pneumatic clamp valve according to claim 3, characterized in that: A diaphragm is provided in the pneumatic chamber, one end of the valve core is fixedly connected to the diaphragm, and the other end can move in the valve body seat; the diaphragm divides the pneumatic chamber into two air chambers that are not connected to each other, and the air pressure difference formed by the two air chambers can drive the diaphragm to deform, thereby driving the valve core to loosen the flow hose, thereby opening the valve.

5. The pneumatic clamp valve according to claim 4, characterized in that: A spring is arranged between the diaphragm and the end cover, and the diaphragm can compress the spring when it is deformed and moved upward.

6. The pneumatic clamp valve according to claim 4, characterized in that: The diaphragm is sealed and connected with the end cover to form a first air chamber, and the first air chamber is connected to the control port.

7. The pneumatic clamp valve according to claim 3, characterized in that: The valve core seat is also provided with an air hole.

8. A valve system, characterized in that: The invention comprises a pipe clamp valve as described in any one of claims 1 to 7.

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