Return valve

Abstract

The utility model discloses a return valve, and relates to the technical field of return valves, in particular to a return valve which comprises a main valve seat, a pilot valve seat and a power valve seat which are detachably connected, a hollow flow pipe is arranged at one end of the main valve seat, a connecting assembly is arranged on the side wall of the main valve seat, and a valve rod is installed on the inner side wall of the pilot valve seat in a sliding mode. And the inner side wall of the power valve seat is fixedly connected with a piston. The main valve seat, the pilot valve seat and the power valve seat are connected in a detachable mode, the main valve seat, the power valve seat and the pilot valve seat can be detached respectively when detachment and maintenance are needed, the valve rod can be cleaned after the main valve seat is detached, it is guaranteed that the hollow flow pipe can be effectively sealed by the valve rod, and the service life of the hollow flow pipe is prolonged. Meanwhile, due to the arrangement of the cushion disc and the deformation groove, when the valve rod moves with the pilot valve seat for a long time to generate heat, thermal expansion and cold contraction can be achieved through the deformation groove, meanwhile, heat exchange and heat dissipation can be conducted through the deformation groove, and the service life of the whole backflow valve is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of return valves, and specifically relates to a return valve. Background Art

[0002] In a glue supply system, a certain pressure is provided to the glue supply circuit to ensure the glue supply. The pressure magnitude determines the glue supply amount and the glue outflow speed. When the pressure is too high, it is easy to cause glue overflow and excessive glue amount. When the pressure is too low, the glue supply will show intermittent phenomena, etc., resulting in product defects. In the known glue supply systems, usually a return valve is used to adjust the pressure of the glue supply pipeline of the glue supply system. However, after long-term use of the dispensing return valve, the inside is prone to glue blockage. And the traditional return valve is not convenient for disassembly and maintenance. Moreover, during long-term movement, due to friction heat generation, it is very easy to cause mechanical fatigue, resulting in poor accuracy of the return valve. For this reason, we make improvements and propose a return valve. Content of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the utility model provides a return valve, which solves the problem that the traditional return valve is not convenient for disassembly and maintenance proposed in the above background art.

[0004] To achieve the above purposes, the utility model is realized through the following technical solutions: A return valve includes a main valve seat, a pilot valve seat and a power valve seat. The main valve seat, the pilot valve seat and the power valve seat are detachably connected. One end of the main valve seat is provided with a hollow flow tube. A connection component is arranged on the side wall of the main valve seat. A valve rod is slidably installed on the inner side wall of the pilot valve seat. A piston is fixedly connected to the inner side wall of the power valve seat. When the piston horizontally slides in the power valve seat, it can push the valve rod to move to open or close the hollow flow tube.

[0005] Optionally, a gasket is further arranged between the pilot valve seat and the power valve seat. A sliding hole adapted to the valve rod is opened in the middle of the gasket. The gasket is made of fluororubber, and the valve rod can horizontally slide at the center of the gasket.

[0006] Optionally, a deformation groove is further opened on one side of the pilot valve seat close to the gasket. The deformation groove can meet the requirements of thermal expansion and contraction on the one hand, and can also conduct air flow intersection to meet the heat dissipation requirements on the other hand, thereby effectively improving the service life of the entire return valve.

[0007] Optionally, a bolt one is inserted into the side wall of the main valve seat, and a bolt two is inserted into the side wall of the power valve seat. The bolt one and the bolt two are respectively threadedly connected to the pilot valve seat. One end of the bolt one passing through the main valve seat is threadedly connected to the pilot valve seat to fix the main valve seat and the pilot valve seat. One end of the bolt two passing through the power valve seat is threadedly connected to the pilot valve seat to fix the power valve seat and the pilot valve seat. Bolt holes adapted to the bolt one and the bolt two are respectively opened on the pilot valve seat.

[0008] Optionally, a sealing ring is inserted between the main valve seat and the pilot valve seat. The sealing ring is made of ethylene propylene diene monomer (EPDM), which can seal the gap between the main valve seat and the pilot valve seat to prevent glue leakage.

[0009] Optionally, an intake pipe one and an intake pipe two are respectively connected to the side wall of the power valve seat. The intake pipe one and the intake pipe two adjust the piston displacement by adjusting the intake air volume. The intake of the intake pipe one pushes the piston and the valve stem to close the hollow flow pipe, and the intake of the intake pipe two pushes the piston and the valve stem to open the hollow flow pipe.

[0010] Optionally, a conical sealing core is arranged on the side of the valve stem close to the hollow flow pipe. The shape of the conical sealing core matches the shape of the port of the hollow flow pipe. The conical sealing core can seal the hollow flow pipe by fitting with the hollow flow pipe.

[0011] Optionally, the connecting component includes a threaded pipe fixedly connected to the side wall of the main valve seat. One end of the threaded pipe is threadedly connected with a nut seat. A connecting conduit is inserted into the inner side wall of the nut seat. A circular sealing ring is arranged on the outer wall of the connecting conduit. When the nut seat is threadedly connected with the threaded pipe, the circular sealing ring is squeezed to form a sealed state.

[0012] The present utility model provides a reflux valve, which has the following beneficial effects:

[0013] In this reflux valve, through the settings of the main valve seat, the pilot valve seat, the power valve seat, the hollow flow pipe, the connecting component, the valve stem and the piston, the main valve seat, the pilot valve seat and the power valve seat are connected in a detachable manner. When disassembly and maintenance are required, the main valve seat and the power valve seat can be disassembled from the pilot valve seat respectively. After the main valve seat is disassembled, the valve stem can be cleaned to ensure that the valve stem can effectively seal the hollow flow pipe. At the same time, through the settings of the cushion plate and the deformation groove, when heat is generated due to the long-term movement of the valve stem and the pilot valve seat, thermal expansion and contraction can be achieved through the deformation groove, and heat exchange and heat dissipation can also be carried out by the deformation groove, ensuring the service life of the entire reflux valve. When the connecting component is connected, it can be fixed by the threaded connection between the nut seat and the threaded pipe, without rotating the conduit, which is convenient for the installation and transmission of the conduit. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the split structure schematic diagram of the present utility model;

[0015] Figure 2 is the three-dimensional structure schematic diagram of the present utility model;

[0016] Figure 3 is the three-dimensional sectional structure schematic diagram of the present utility model;

[0017] Figure 4 is the sectional structure schematic diagram of the present utility model;

[0018] Figure 5 This is a schematic structural view of the connection component of the present utility model.

[0019] In the figure: 1, main valve seat; 11, bolt one; 2, pilot valve seat; 3, power valve seat; 31, bolt two; 32, first intake pipe; 33, second intake pipe; 34, piston; 4, hollow flow pipe; 5, connection component; 51, threaded pipe; 52, nut seat; 53, conduit; 54, circular sealing ring; 6, valve stem; 61, conical sealing core; 7, cushion plate; 8, deformation groove; 9, sealing ring. Specific embodiments

[0020] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. On the contrary, they are merely examples of devices consistent with some aspects of the present disclosure as detailed in the appended claims.

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

[0022] Please refer to Figures 1 to 5 , the present utility model provides a technical solution: a reflux valve, including a main valve seat 1, a pilot valve seat 2 and a power valve seat 3. The main valve seat 1, the pilot valve seat 2 and the power valve seat 3 are detachably connected. One end of the main valve seat 1 is provided with a hollow flow pipe 4, and a connection component 5 is provided on the side wall of the main valve seat 1. A valve stem 6 is slidably installed on the inner side wall of the pilot valve seat 2, and a piston 34 is fixedly connected to the inner side wall of the power valve seat 3. When the piston 34 slides horizontally in the power valve seat 3, it can push the valve stem 6 to move to open or close the hollow flow pipe 4.

[0023] As a preferred embodiment, on the basis of the above method, further, a cushion plate 7 is further provided between the pilot valve seat 2 and the power valve seat 3. A sliding hole adapted to the valve stem 6 is provided in the middle of the cushion plate 7. The cushion plate 7 is made of fluororubber, and the valve stem 6 can slide horizontally at the center of the cushion plate 7.

[0024] A deformation groove 8 is further provided on the side of the pilot valve seat 2 close to the cushion plate 7. The deformation groove 8 can meet the requirements of thermal expansion and contraction on the one hand, and can also conduct air flow intersection to meet the heat dissipation requirements on the other hand, thereby effectively improving the service life of the entire reflux valve.

[0025] The side wall of the main valve seat 1 is inserted with a first bolt 11, and the side wall of the power valve seat 3 is inserted with a second bolt 31. The first bolt 11 and the second bolt 31 are respectively threadedly connected to the pilot valve seat 2. One end of the first bolt 11 passing through the main valve seat 1 is threadedly connected to the pilot valve seat 2 to fix the main valve seat 1 and the pilot valve seat 2. One end of the second bolt 31 passing through the power valve seat 3 is threadedly connected to the pilot valve seat 2 to fix the power valve seat 3 and the pilot valve seat 2. The pilot valve seat 2 is respectively provided with bolt holes adapted to the first bolt 11 and the second bolt 31.

[0026] A sealing ring 9 is also inserted between the main valve seat 1 and the pilot valve seat 2. The sealing ring 9 is made of ethylene propylene diene monomer (EPDM). The sealing ring 9 can seal the gap between the main valve seat 1 and the pilot valve seat 2 to prevent glue leakage.

[0027] As a preferred embodiment, on the basis of the above method, further, the side walls of the power valve seat 3 are respectively connected with a first intake pipe 32 and a second intake pipe 33. The first intake pipe 32 and the second intake pipe 33 adjust the displacement of the piston 34 by adjusting the intake air volume. The first intake pipe 32 intakes air to push the piston 34 and the valve stem 6 to close the hollow flow pipe 4. The second intake pipe 33 intakes air to push the piston 34 and the valve stem 6 to open the hollow flow pipe 4. A conical sealing core 61 is arranged on one side of the valve stem 6 close to the hollow flow pipe 4. The conical sealing core 61 matches the port shape of the hollow flow pipe 4. The conical sealing core 61 fits the hollow flow pipe 4 to seal the hollow flow pipe 4.

[0028] The connecting component 5 includes a threaded pipe 51 fixedly connected to the side wall of the main valve seat 1. One end of the threaded pipe 51 is threadedly connected with a nut seat 52. The inner side wall of the nut seat 52 is inserted with a connecting conduit 53. A circular sealing ring 54 is arranged on the outer wall of the connecting conduit 53. When the nut seat 52 is threadedly connected with the threaded pipe 51, the circular sealing ring 54 is extruded to form a sealed state.

[0029] In summary, for this reflux valve, when in use, through the settings of the main valve seat 1, the pilot valve seat 2, the power valve seat 3, the hollow flow pipe 4, the connecting component 5, the valve stem 6 and the piston 34, the main valve seat 1, the pilot valve seat 2 and the power valve seat 3 are connected in a detachable manner. When disassembly and maintenance are required, the main valve seat 1 and the power valve seat 3 can be disassembled from the pilot valve seat 2 respectively. After the main valve seat 1 is disassembled, the valve stem 6 can be cleaned to ensure that the valve stem 6 can effectively seal the hollow flow pipe 4. At the same time, through the settings of the cushion plate 7 and the deformation groove 8, when heat is generated due to the long-term movement of the valve stem 6 and the pilot valve seat 2, thermal expansion and contraction can be achieved through the deformation groove 8, and heat exchange and heat dissipation can also be carried out by the deformation groove 8 to ensure the service life of the entire reflux valve. When the connecting component 5 is connected, it can be fixed by the threaded connection between the nut seat 52 and the threaded pipe 51 without rotating the conduit 53, which is convenient for the installation and transmission of the conduit 53.

[0030] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A reflux valve, characterized in that: It includes a main valve seat (1), a pilot valve seat (2) and a power valve seat (3). The main valve seat (1), the pilot valve seat (2) and the power valve seat (3) are detachably connected. One end of the main valve seat (1) is provided with a hollow flow pipe (4). A connection component (5) is arranged on the side wall of the main valve seat (1). A valve stem (6) is slidably installed on the inner side wall of the pilot valve seat (2). A piston (34) is fixedly connected to the inner side wall of the power valve seat (3). When the piston (34) horizontally slides in the power valve seat (3), it can push the valve stem (6) to move to open or close the hollow flow pipe (4).

2. The reflux valve according to claim 1, characterized in that: A gasket (7) is also arranged between the pilot valve seat (2) and the power valve seat (3). A sliding hole adapted to the valve stem (6) is opened in the middle of the gasket (7). The gasket (7) is made of fluororubber material.

3. The reflux valve according to claim 2, characterized in that: A deformation groove (8) is also opened on one side of the pilot valve seat (2) close to the gasket (7).

4. The reflux valve according to claim 1, characterized in that: A bolt one (11) is inserted into the side wall of the main valve seat (1), and a bolt two (31) is inserted into the side wall of the power valve seat (3). The bolt one (11) and the bolt two (31) are respectively threadedly connected to the pilot valve seat (2).

5. A reflux valve according to claim 1, wherein: A sealing ring (9) is also inserted between the main valve seat (1) and the pilot valve seat (2). The sealing ring (9) is made of ethylene propylene diene monomer material.

6. The reflux valve according to claim 1, characterized in that: An air inlet pipe one (32) and an air inlet pipe two (33) are respectively connected to the side wall of the power valve seat (3). The air inlet pipe one (32) and the air inlet pipe two (33) adjust the displacement of the piston (34) by adjusting the air intake volume.

7. A reflux valve according to claim 1, characterized in that: A conical sealing core (61) is arranged on one side of the valve stem (6) close to the hollow flow pipe (4). The conical sealing core (61) matches the port shape of the hollow flow pipe (4).

8. A reflux valve according to claim 1, characterized in that: The connection component (5) includes a threaded pipe (51) fixedly connected to the side wall of the main valve seat (1). One end of the threaded pipe (51) is threadedly connected to a nut seat (52). A connection conduit (53) is inserted into the inner side wall of the nut seat (52). A circular sealing ring (54) is arranged on the outer wall of the connection conduit (53). When the nut seat (52) is threadedly connected to the threaded pipe (51), it squeezes the circular sealing ring (54) to form a sealed state.

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