Plastic valve with high sealing performance

Abstract

The plastic valve comprises a valve body, a valve cover, a valve shaft and a valve element which are arranged on a medium flow channel, the valve cover is arranged on the valve body, a first screw hole is formed in the valve cover, the valve shaft is arranged in the first screw hole in a penetrating mode, and a piston flow blocking mechanism is arranged in the valve body. The piston flow blocking mechanism comprises a piston cavity and a piston connecting part which are formed in the valve body, the upper end of the piston cavity communicates with the first screw hole, the lower end of the piston cavity communicates with the medium flow channel, the piston connecting part is movably arranged in the piston cavity, the upper portion of the piston connecting part is rotationally connected with the bottom end of the valve shaft, and the lower portion of the piston connecting part is fixedly connected with the top end of the valve element. According to the plastic valve with the high sealing performance, the phenomenon that a medium in the valve body leaks along the valve shaft can be effectively prevented, and the sealing performance of the plastic valve is improved.

Description

Technical Field

[0001] The utility model relates to a high-sealability plastic valve. Background Art

[0002] Plastic valves have the advantages of light weight, corrosion resistance, no scale absorption, can be integrated with plastic pipes and have a long service life. The application advantages of plastic valves in plastic pipe systems for water supply and other industrial fluids are unmatched by other valves.

[0003] Existing plastic valves usually drive the valve core by rotating the valve shaft, so that the valve core is in close contact with the bottom of the medium flow channel to achieve a sealing effect; after the plastic valve has been used for a period of time, a wear gap will be generated between the valve core and the valve body, which will reduce the sealing effect of the plastic valve. When the valve is opened, the medium may leak out along the valve shaft through the wear gap under the action of strong pressure. Therefore, we have launched a high-sealing plastic valve. Summary of the invention

[0004] The utility model aims to provide a high-sealing plastic valve, which can effectively prevent the medium in the valve body from leaking along the valve shaft, thereby greatly improving the sealing performance of the plastic valve.

[0005] To achieve the above-mentioned purpose, the technical solution of the utility model is to design a high-sealing plastic valve, including a valve body, a valve cover, a valve shaft and a valve core arranged on a medium flow channel, the valve cover is arranged on the valve body, a first screw hole is opened on the valve cover, the valve shaft is inserted into the first screw hole, the valve shaft is threadedly connected to the first screw hole, a piston flow-blocking mechanism is provided in the valve body, the piston flow-blocking mechanism includes a piston cavity and a piston connecting part opened in the valve body, the upper end of the piston cavity is connected to the first screw hole, the lower end of the piston cavity is connected to the medium flow channel, the piston connecting part is movably arranged in the piston cavity, the upper part of the piston connecting part is rotatably connected to the bottom end of the valve shaft, and the lower part of the piston connecting part is fixedly connected to the top end of the valve core.

[0006] Preferably, the piston connecting part includes an I-shaped connecting block and a rubber plug ring, the I-shaped connecting block includes an upper plate, a lower plate and a middle connecting column, the lower plate is provided with a second screw hole, the upper end of the middle connecting column is fixedly connected to the upper plate, the lower end of the middle connecting column is threadedly connected to the second screw hole of the lower plate, the rubber plug ring is sleeved on the outer side of the middle connecting column, the rubber plug ring is located between the upper plate and the lower plate, and the rubber plug ring is sealingly abutted against the inner wall of the piston cavity.

[0007] Preferably, a rotating connection block in an inverted T shape is provided at the bottom end of the valve shaft, a corresponding rotating connection groove is opened on the upper surface of the upper plate, and the rotating connection block is movably arranged in the rotating connection groove.

[0008] Preferably, a U-shaped sealing head is provided at the bottom end of the valve core, a matching sealing limit groove is provided at the bottom of the medium flow channel, and the sealing head is inserted into the sealing limit groove.

[0009] Preferably, the rubber plug ring and the sealing head are both rubber seals.

[0010] The advantages and beneficial effects of the utility model are: providing a highly sealing plastic valve, by arranging a piston flow blocking mechanism in the valve body, when the valve is opened, the piston connecting part in the piston cavity plays a role of blocking the medium, which can effectively prevent the medium in the valve body from leaking along the valve shaft, thereby greatly improving the sealing performance of the plastic valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the utility model. DETAILED DESCRIPTION

[0012] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0013] The technical solution specifically implemented in this utility model is:

[0014] like Figure 1 As shown, a high-sealing plastic valve comprises a valve body 1, a valve cover 2, a valve shaft 3 and a valve core 4 arranged on a medium flow channel 8, the valve cover 2 is arranged on the valve body 1, a first screw hole 5 is opened on the valve cover 2, the valve shaft 3 is penetrated in the first screw hole 5, the valve shaft 3 is threadedly connected to the first screw hole 5, a rotating plate 6 is provided on the upper end of the valve shaft 3, a piston flow blocking mechanism 7 is provided in the valve body 1, the piston flow blocking mechanism 7 comprises a piston cavity 71 and a piston connecting part 72 opened in the valve body 1, the upper end of the piston cavity 71 is connected to the first screw hole 5, the lower end of the piston cavity 71 is connected to the medium flow channel 8, the piston connecting part 72 is movably arranged in the piston cavity 71, the upper part of the piston connecting part 72 is rotatably connected to the bottom end of the valve shaft 3, and the lower part of the piston connecting part 72 is fixedly connected to the top end of the valve core 4.

[0015] The piston connection part 72 includes an I-shaped connection block and a rubber plug ring 721. The I-shaped connection block includes an upper plate 722, a lower plate 723 and a middle connecting column 724. The lower plate 723 is provided with a second screw hole 725. The upper end of the middle connecting column 724 is fixedly connected to the upper plate 722. The lower end of the middle connecting column 724 is threadedly connected to the second screw hole 725 of the lower plate 723. The rubber plug ring 721 is sleeved on the outer side of the middle connecting column 724. The rubber plug ring 721 is located on the upper plate 722. 22 and the lower plate 723, the plug ring 721 is in sealing contact with the inner wall of the piston chamber 71; in actual use, the structural arrangement of the I-shaped connecting block and the plug ring 721 allows for quick and convenient replacement of the plug ring 721 after the plug ring 721 is worn, and at the same time, the upper plate 722 and the lower plate 723 clamp the plug ring 721, which plays a role in fixing and limiting the plug ring 721, reduces the deformation of the plug ring 721, and is beneficial to improving the sealing contact between the piston connecting portion 72 and the piston chamber 71.

[0016] The bottom end of the above-mentioned valve shaft 3 is provided with an inverted T-shaped rotating connecting block 31, and the upper surface of the upper plate 722 is provided with a corresponding rotating connecting groove 32, and the rotating connecting block 31 is movably arranged in the rotating connecting groove 32; in actual use, when the valve shaft 3 drives the piston connecting part 72 to move up and down, it can be prevented that the rotation of the valve shaft 3 drives the piston connecting part 72 to rotate accordingly.

[0017] A U-shaped sealing head is provided at the bottom end of the valve core 4, and a matching sealing limit groove is opened at the bottom of the medium flow channel 8, and the sealing head is inserted into the sealing limit groove; in actual use, it is beneficial to improve the contact seal between the valve core 4 and the medium flow channel 8.

[0018] The rubber plug ring 721 and the sealing head are both rubber sealing parts.

[0019] When the plastic valve needs to be closed, the rotating plate 6 is rotated clockwise, and the rotating plate 6 pushes the piston connecting part 72 to move downward along the piston cavity 71 through the valve shaft 3, and the piston connecting part 72 drives the valve core 4 to move downward until the sealing head at the bottom of the valve core 4 is inserted into the sealing limit groove. At this time, the U-shaped sealing head is tightly fitted with the sealing limit groove, and the medium flow channel 8 is effectively blocked;

[0020] When the plastic valve needs to be opened, the rotating plate 6 is rotated counterclockwise. Similarly, the rotating plate 6 drives the piston connecting part 72 to move upward through the valve shaft 3, and the piston connecting part 72 drives the valve core 4 to move upward, and the medium flow channel 8 is opened. In the process of the piston connecting part 72 moving along the piston cavity 71, the rubber plug ring 721 maintains a sealed contact with the inner wall of the piston cavity 71, which plays a role in blocking the medium, and can effectively prevent the medium in the valve body from leaking along the valve shaft 3, thereby greatly improving the sealing performance of the plastic valve.

[0021] After the rubber plug ring 721 is worn out and fails, it is only necessary to open the valve cover 2 on the valve body 1, remove the piston connecting part 72 from the piston cavity 71, and separate the lower plate 723 from the middle connecting column 724 by rotating the lower plate 723 of the I-shaped connecting block. The worn and failed rubber plug ring 721 can be removed and replaced with a new one. After that, the piston connecting part 72 and the valve cover 2 are reset to complete the disassembly and replacement of the rubber plug ring 721.

[0022] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A high-sealing plastic valve, comprising a valve body, a valve cover, a valve shaft and a valve core arranged on a medium flow channel, wherein the valve cover is arranged on the valve body, a first screw hole is opened on the valve cover, the valve shaft is passed through the first screw hole, and the valve shaft is threadedly connected to the first screw hole, characterized in that: A piston flow-blocking mechanism is provided in the valve body, and the piston flow-blocking mechanism includes a piston cavity and a piston connecting part opened in the valve body, the upper end of the piston cavity is connected to the first screw hole, and the lower end of the piston cavity is connected to the medium flow channel, and the piston connecting part is movably arranged in the piston cavity, the upper part of the piston connecting part is rotatably connected to the bottom end of the valve shaft, and the lower part of the piston connecting part is fixedly connected to the top end of the valve core.

2. A high-sealing plastic valve according to claim 1, characterized in that: The piston connecting part includes an I-shaped connecting block and a rubber plug ring. The I-shaped connecting block includes an upper plate, a lower plate and a middle connecting column. The lower plate is provided with a second screw hole. The upper end of the middle connecting column is fixedly connected to the upper plate. The lower end of the middle connecting column is threadedly connected to the second screw hole of the lower plate. The rubber plug ring is sleeved on the outer side of the middle connecting column. The rubber plug ring is located between the upper plate and the lower plate. The rubber plug ring is sealed and abutted against the inner wall of the piston cavity.

3. A high-sealing plastic valve according to claim 2, characterized in that: The bottom end of the valve shaft is provided with an inverted T-shaped rotating connection block, and the upper surface of the upper plate is provided with a corresponding rotating connection groove, and the rotating connection block is movably arranged in the rotating connection groove.

4. A high-sealing plastic valve according to claim 3, characterized in that: A U-shaped sealing head is provided at the bottom end of the valve core, a matching sealing limit groove is provided at the bottom of the medium flow channel, and the sealing head is inserted into the sealing limit groove.

5. A high-sealing plastic valve according to claim 4, characterized in that: The rubber plug ring and the sealing head are both rubber sealing parts.

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