Pinch valve

Abstract

The utility model relates to the technical field of pneumatic pinch valves, and provides a pinch valve which comprises a main valve body, a rubber tube and a valve body assembly, the rubber tube comprises a rubber tube main body and outer edges arranged at the two ends of the rubber tube main body, the rubber tube main body is elastic, and the inner diameter of the middle of the rubber tube main body is smaller than that of the two ends of the rubber tube main body. A pre-pressing angle is formed at the section, connected with the outer edge, of the rubber tube main body; an inflation cavity is formed by the rubber pipe and the inner side wall of the main valve body, the outer edge is attached to the inner wall of the main valve body, and an air nozzle communicated with the inflation cavity is arranged on the side wall of the main valve body. The valve body assembly comprises a positioning ring and pressing rings, the positioning ring is arranged on the outer side wall of the rubber pipe in a sleeving mode and attached to the inner side of the outer edge, and the pressing rings are installed at the two ends of the main valve body. According to the utility model, the internal structure of the main valve body is simplified, so that the product is more convenient to form and assemble; a pre-pressing angle and a fixing part are specially designed for the elastic rubber pipe, the rubber pipe is ensured to be stable, the service life of the rubber pipe is prolonged, and the closing effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to pneumatic pinch valve technical field, specifically a pinch valve. BACKGROUND

[0002] The existing pneumatic pinch valve structure adopts a large amount of metal structure, and the air inlet cavity structure in the main shell where the air inlet is located is complex, which is not conducive to molding and assembly. There is no pre-pressing angle cooperation between the elastic pinch pipe and the outer shell, and the elastic pinch pipe needs to be repeatedly stretched to realize functionality during work, which causes large material fatigue and stress damage, resulting in insufficient product life. INVENTION CONTENTS

[0003] In view of the above technical problems, the utility model provides a pinch valve which adopts pre-pressing angle design and positioning and fixing assembly, simplifies the internal structure, and can effectively improve the service life and use effect.

[0004] The utility model discloses a technical scheme as follows to realize the technical purpose:

[0005] A pinch valve, comprising a main valve body, a rubber pipe and a valve body assembly, the rubber pipe comprises a rubber pipe body and an outer edge arranged at both ends of the rubber pipe body, the rubber pipe body is elastic, and the inner diameter of the rubber pipe body in the middle is smaller than the inner diameter of both ends, and a pre-pressing angle is formed in the section where the rubber pipe body and the outer edge are connected;The outer edge and the inner wall of the main valve body are in close contact, and the inner wall of the main valve body is provided with an air nozzle in communication with the inflation cavity;The valve body assembly comprises a positioning ring and a pressing ring, the positioning ring is arranged on the outer wall of the rubber pipe, and the inner side of the positioning ring and the outer edge are in close contact, and the pressing ring is arranged at both ends of the main valve body.

[0006] Preferably, the pre-pressing angle is between 30-45°.

[0007] Preferably, the pressing ring is provided with an annular groove matched with the outer edge at one end close to the main valve body.

[0008] More preferably, the valve body assembly further comprises an O-ring, and the inner wall of the O-ring and the pressing ring are in close contact.

[0009] More preferably, the valve body assembly further comprises a quick-connection nut, and the quick-connection nut and the pressing ring are detachably installed through threads.

[0010] Preferably, the valve body assembly further comprises a quick-connection claw, and one end of the quick-connection claw can be inserted into the interior of the quick-connection nut.

[0011] Preferably, the main valve body, the rubber pipe and the pressing ring are welded by ultrasonic process.

[0012] Preferably, the positioning ring and the pressing ring are made of plastic material.

[0013] The utility model discloses the following beneficial effects:

[0014] The utility model discloses simplified the internal structure of main valve body, make product forming and assembly more convenient, to the elastic rubber tube, special design pre -press angle and fixed component, ensure that the rubber tube is stable, and promote its service life and close effect. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 is the longitudinal section of the utility model;

[0016] Fig. 2 is the explosion drawing of the utility model;

[0017] Fig. 3 is the overall structure schematic diagram of the utility model;

[0018] Fig. 4 is the pressure ring and rubber tube installation schematic diagram of the utility model;

[0019] Fig. 5 is the longitudinal section of the rubber tube of the utility model.

[0020] Reference signs:

[0021] 1, main valve body, 2, rubber tube, 3, positioning ring, 4, pressure ring, 5, O ring, 6, quick coupling nut, 7, quick coupling claw, 8, air cock, 9, annular groove, 10, outer edge, 11, rubber tube main body. DETAILED DESCRIPTION

[0022] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "up / down", "front / back", "inner / outer", "top / bottom end" etc. is the orientation or position relationship shown in the drawing, and is only for the convenience of describing the utility model and simplifying the description, and is not to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model.

[0023] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" etc. should be understood broadly, for example, "connection" can be fixed connection, can also be detachable connection, or integrally connected, can be mechanical connection, can also be electrical connection, can be directly connected, can also be indirectly connected through intermediate medium, can be the communication inside the adaptation type component. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances. In addition, unless otherwise specified, the components used in the application are all commercially available components, and the connection between different components can be realized through conventional technical means.

[0024] The utility model will be further described in detail in combination with the drawings and specific embodiments.

[0025] A pinch valve, such as Figures 1-5 As shown, the device includes a main valve body 1, a hose 2, and a valve body assembly. The hose 2 includes a hose body 11 and outer edges 10 located at both ends of the hose body 11. The sidewalls of the hose body 11 are elastic, and the inner diameter in the middle of the hose body 11 is smaller than the inner diameters on both sides. A pre-compression angle is formed at the junction of the hose body 11 and the outer edges 10. Figure 5 As shown, angles A and B are both preload angles;

[0026] In actual operation, the small-angle transition design with a thin middle and thick sides can ensure that both ends of the hose 2 have sufficient strength; at the same time, the pre-compression angle allows the hose body 11 to present a corresponding angle when stretched in the center, avoiding the greater stress caused by the right angle at both ends; after the positioning ring 3, pressure ring 4 and hose 2 are assembled, the outer edge 10 fits against the inner wall of the main valve body 1.

[0027] An inflation cavity is formed between the hose 2 and the inner wall of the main valve body 1. An air nozzle 8 communicating with the inflation cavity is provided on the side wall of the main valve body 1. The valve body assembly includes a positioning ring 3 and a pressure ring 4. The positioning ring 3 is sleeved on the outer wall of the hose 2 and the positioning ring 3 is in contact with the inner side of the outer edge 10 of the hose 2. The pressure ring 4 is installed at both ends of the main valve body 1. The positioning ring 3 and the pressure ring 4 are used to fix the hose 2 and the main valve body 1 together to ensure the fixing effect.

[0028] In this embodiment, as Figure 1 and Figure 4 As shown, the positioning ring 3 fits against the inner side of the outer edge 10, and slots are opened on the inner sidewalls of both ends of the main valve body 1. Part of the positioning ring 3 contacts the outer edge 10, and the other part is fitted into the slot. The outer diameter of the end of the pressure ring 4 that contacts the main valve body 1 is the same as the outer diameter of the main valve body 1, so as to facilitate alignment and welding.

[0029] Preferably, the pre-compression angle is between 30 and 45°.

[0030] Preferably, the pressure ring 4 is a bolt-shaped pipe with a hollow interior, and one end has a larger radius than the other. Specifically, the pressure ring 4 has an annular groove 9 at the end closest to the main valve body 1 (the end with the relatively larger radius) that matches the outer edge 10 of the hose 2. Figure 1 and Figure 4 As shown, during the production process, the outer edge 10 is installed in the annular groove 9 of the pressure ring 4. The pressure ring 4 and the end of the main valve body 1 are welded together. The outer edge 10 can be fixed by the annular groove 9 and the positioning ring 3, thereby fixing the hose 2 and the main valve body 1 together. This design can provide greater resistance to deformation of the hose wall.

[0031] As more preferably, the valve body assembly further comprises an O-ring 5, the O-ring 5 and the inner wall of the compression ring 4 are attached, and the O-ring is mainly used for sealing between the quick coupling nut 6 and the compression ring 4.

[0032] As more preferably, the valve body assembly further comprises a quick coupling nut 6, and the quick coupling nut 6 and the compression ring 4 are detachably installed through threads.

[0033] As preferably, the valve body assembly further comprises a quick coupling claw 7, one end of the quick coupling claw 7 is capable of being inserted into the inside of the quick coupling nut 6; the threaded connection between the compression ring 4 and the quick coupling nut 6 and the arrangement of the quick coupling claw 7 make the product easy to be shaped and assembled.

[0034] As preferably, the main valve body 1, the rubber tube 2 and the compression ring 4 are welded through an ultrasonic process; it is to be noted that the ultrasonic welding process is only an option, and other connection processes can be used according to actual needs in the production process.

[0035] As preferably, the positioning ring 3 and the compression ring 4 are made of plastic material, and the overall cost is lower and the quality is lighter.

[0036] The assembly mode and working principle of the utility model are as follows:

[0037] The rubber tube 2, the main valve body 1 and the positioning ring 3 are assembled; the positioning ring 3 is sleeved on the outer wall of the rubber tube 2 at both ends, so that the positioning ring 3 and the inner side of the outer edge 10 are attached;

[0038] The assembled main valve body 1, positioning ring 3, rubber tube 2 and compression ring 4 are assembled and welded and fixed through an ultrasonic process; the outer edge 10 of the rubber tube 2 is installed in the annular groove 9 of the compression ring 4, and the end of the corresponding compression ring 4 is attached to the end of the main valve body 1, and then welding is performed;

[0039] The O-ring 5, the compression ring 4 and the quick coupling nut 6 are assembled; the O-ring 5 is installed at a specified position, the quick coupling nut 6 is rotated, and the quick coupling nut 6 and the compression ring 4 are screwed together;

[0040] Finally, the matching quick coupling claw 7 is inserted into the quick coupling nut 6, so as to complete the assembly of the whole pinch valve.

[0041] When the rubber tube 2 is not working, it is in a straight-through state; when compressed gas is filled into the inflation cavity between the inner side wall of the rubber tube 2 and the main valve body 1 through the air nozzle 8, the tube wall of the rubber tube 2 will deform inwardly due to the elasticity of the tube wall of the rubber tube 2, and finally contact each other, so as to complete the closing of the pinch valve and achieve the purpose of blocking the fluid.

[0042] Although the embodiments of the utility model are described in the specification, these embodiments are only as a prompt, should not limit the protection scope of the utility model. In the range without departing from the utility model purposes, various omissions, replacements and changes should be contained in the protection scope of the utility model.

Claims

1. A clamp tube valve characterized by, The valve body assembly comprises a main valve body, a rubber tube and a valve body assembly, the rubber tube comprises a rubber tube body and an outer rim arranged at both ends of the rubber tube body, the rubber tube body is elastic, the inner diameter of the rubber tube body in the middle is smaller than the inner diameter of both ends, a section where the rubber tube body and the outer rim are connected is formed with a pre-pressing angle; the rubber tube and the inner side wall of the main valve body are formed with an inflation cavity and the outer rim and the inner wall of the main valve body are in close contact, the side wall of the main valve body is provided with an air nozzle in communication with the inflation cavity; the valve body assembly comprises a positioning ring and a pressing ring, the positioning ring is sleeved on the outer side wall of the rubber tube and the inner side of the positioning ring and the outer rim are in close contact, and the pressing ring is installed at both ends of the main valve body.

2. A clamp valve as claimed in claim 1, characterised in that The pre-pressing angle is between 30-45°.

3. A clamp valve as claimed in claim 1, wherein The pressing ring is provided with an annular groove matched with the outer rim at one end close to the main valve body.

4. A clamp valve as claimed in claim 3, wherein The valve body assembly further comprises an O-ring, and the O-ring is in close contact with the inner wall of the pressing ring.

5. A clamp valve as claimed in claim 3, wherein the valve body is formed from a material having a coefficient of thermal expansion of less than 10 x 10"6 in / in / °F. The valve body assembly further comprises a quick-connection screw cap, and the quick-connection screw cap and the pressing ring are detachably installed through threads.

6. A clamp valve as claimed in claim 5, wherein The valve body assembly further comprises a quick-connection claw, and one end of the quick-connection claw can be inserted into the interior of the quick-connection screw cap.

7. A clamp valve as claimed in claim 1, wherein The main valve body, the rubber tube and the pressing ring are welded through an ultrasonic process.

8. A clamp valve according to any one of claims 1 to 7, wherein The positioning ring and the pressing ring are made of plastic material.

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