Self-cleaning washing-free stop valve

Abstract

A water inlet and a water outlet are formed in the two ends of a valve body respectively, the water inlet is connected with a low-position pressure relief cavity through a water inlet channel, a valve seat is installed in the portion, above the pressure relief cavity, of the valve body, an expansion cavity communicated with the pressure relief cavity is defined by the middle of the valve seat, and the diameter of the expansion cavity is smaller than that of the pressure relief cavity; a valve cage is installed on the periphery of the valve seat, and a cage opening is formed in the side face of the valve cage and communicated with the water outlet through a water outlet channel. An extension rod is fixed to the lower end of the valve element and penetrates through the diffusion cavity to stretch into the pressure relief cavity, and a paddle is rotationally connected to the end of the extension rod. According to the utility model, the rotating paddle is additionally arranged at the lower end of the valve core, so that the paddle rotates under the resistance action of water when the paddle ascends along with the valve core so as to generate a vortex which can roll up sediments deposited in the pressure relief cavity and leave the valve body along with water flow, thereby solving the problem that the conventional pressure relief cavity needs to remove sediments and impurities in a dismounting and cleaning manner; and the overhaul and maintenance frequency can be reduced.

Description

Technical Field

[0001] The utility model relates to the field of stop valves, in particular to a self-cleaning flushing-free stop valve. Background Art

[0002] The flush-free stop valve is a valve core protection structure provided inside the valve to prevent the high-pressure water flow from flushing the sealing surface of the valve core and the valve seat, which may cause the sealing performance to decrease. An existing flush-free stop valve uses a low-position pressure relief chamber to eliminate water pressure. The liquid level rises with the increase of water volume, and when it rises to the valve seat, it can leave from the outlet, thereby protecting the valve core and the valve seat from the impact of high-pressure water flow and extending the service life of the valve. However, since the water flow slows down in the pressure relief chamber, it is easy for sediment to accumulate in the pressure relief chamber, so the valve needs to be disassembled frequently to clean the inside, which increases the frequency of valve maintenance. Utility Model Content

[0003] The purpose of the present application is to provide a self-cleaning flush-free stop valve, aiming to solve the problems existing in the prior art.

[0004] The embodiment of the present application provides a self-cleaning flush-free stop valve, including a valve body, a valve seat, a valve core, a valve stem, a handwheel and a guide plate, wherein a water inlet and a water outlet are respectively provided at two ends of the valve body, wherein the water inlet is connected to a low-position pressure relief chamber via a water inlet channel, a valve seat is installed in the valve body above the pressure relief chamber, and the middle part of the valve seat forms an expansion chamber connected to the pressure relief chamber, wherein the diameter of the expansion chamber is smaller than the diameter of the pressure relief chamber; a valve cage is installed at the outer periphery of the valve seat, a cage opening is opened on the side of the valve cage, and the cage opening is connected to the water outlet via a water outlet channel; the interior of the valve cage is a brush-free chamber, and the valve core is in the brush-free chamber; an extension rod is fixed to the lower end of the valve core, the extension rod passes through the expansion chamber and extends into the pressure relief chamber, and a paddle is rotatably connected to the end of the extension rod.

[0005] Furthermore, a stopper is installed between the valve stem and the valve cage; a first gland is installed above the valve cage, a first seal is provided between the first gland and the valve body, and a second seal is provided between the first gland and the stopper.

[0006] Furthermore, a third seal is provided between the first gland and the valve stem.

[0007] Furthermore, a second pressure cover is installed on the first pressure cover above the third seal, the cross-section of the second pressure cover is I-shaped, the upper end area of ​​the second pressure cover is larger than the lower end area of ​​the second pressure cover, the lower end of the second pressure cover is fixedly connected to the first pressure cover, and the upper end of the second pressure cover is fixedly connected to the guide plate.

[0008] Furthermore, a fourth seal is provided between the valve seat and the valve body.

[0009] The beneficial effects of the utility model are as follows: the utility model adds a rotating paddle at the lower end of the valve core, so that the paddle rotates under the resistance of water when the valve core rises, thereby generating a vortex that can roll up the sediment deposited in the pressure relief chamber and leave the valve body with the water flow, thereby solving the problem that the existing pressure relief chamber needs to be disassembled and cleaned to remove sediment impurities, and the frequency of inspection and maintenance can be reduced. In addition, the overall structure of the utility model can facilitate the disassembly and assembly of the valve body, and the multiple seals can ensure the overall sealing of the valve body and extend the service life of the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0011] Figure 2 It is a schematic diagram of the overall structure inside the valve body.

[0012] Figure 3 It is a structural diagram of the blade part.

[0013] In the figure:

[0014] 1. Valve body; 2. Valve seat; 3. Valve core; 4. Valve stem; 5. Handwheel; 6. Guide plate; 7. Water inlet; 8. Water outlet; 9. Water inlet channel; 10. Pressure relief chamber; 11. Expansion chamber; 12. Valve cage; 13. Cage mouth; 14. Water outlet channel; 15. Brushless chamber; 16. Extension rod; 17. Paddle; 18. Bearing; 19. Stopper; 20. First pressure cover; 21. First seal; 22. Second seal; 23. Third seal; 24. Second pressure cover; 25. Fourth seal. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] like Figure 1 and Figure 2As shown, a self-cleaning flush-free stop valve includes a valve body 1, a valve seat 2, a valve core 3, a valve stem 4, a handwheel 5 and a guide plate 6. The upper end of the valve stem 4 passes through the guide plate 6 to connect with the handwheel 5, and the lower end of the valve stem 4 extends into the valve body 1 and is connected with the valve core 3. Wherein, a water inlet 7 and a water outlet 8 are provided at opposite ends of the valve body 1 at the same height. The water inlet 7 is connected to a low-position pressure relief chamber 10 through a downwardly inclined water inlet channel 9. A valve seat 2 is installed in the valve body 1 above the pressure relief chamber 10. The middle part of the valve seat 2 forms a diffusion chamber 11 connected to the pressure relief chamber 10. The diameter of the diffusion chamber 11 is smaller than the diameter of the pressure relief chamber 10. A valve cage 12 is installed on the periphery of the valve seat 2. A cage opening 13 is opened on the side of the valve cage 12. The cage opening 13 is connected to the water outlet 8 through a water outlet channel 14. The interior of the valve cage 12 is a brushless chamber 15. The valve core 3 is in the brushless chamber 15. An extension rod 16 is fixed to the lower end of the valve core 3. The extension rod 16 passes through the diffusion chamber 11 and extends into the pressure relief chamber 10. A paddle 17 is rotatably connected to the end of the extension rod 16. The paddle 17 is symmetrically mounted on the extension rod 16 through a bearing 18, as shown in FIG. Figure 3 shown.

[0017] The valve core 3 presses downward against the valve seat 2 to cut off the flow. After the pressurized water flows into the water inlet channel 9, the pressure is released in the pressure relief chamber 10. As the amount of water increases, the liquid level in the pressure relief chamber 10 rises to the expansion chamber 11, and there is no flushing pressure on the valve core 3. When the valve core 3 moves upward to open the valve, the paddle 17 connected below the valve core 3 rises together. During the rising process of the paddle 17, the water resistance acts on the surface of the paddle 17, causing the paddle 17 to rotate and generate eddy currents. The eddy currents can roll up the impurities deposited at the bottom of the pressure relief chamber 10 and leave through the water outlet 8 with the water flow, realizing self-cleaning in the valve body 1.

[0018] A stopper 19 is installed between the valve stem 4 and the valve cage 12; a first gland 20 is installed above the valve cage 12, and the first gland 20 is used to fix the valve cage 12 and the valve seat 2 in the valve body 1. A first seal 21 is provided between the first gland 20 and the valve body 1, and a second seal 22 is provided between the first gland 20 and the stopper 19.

[0019] A third seal 23 is provided between the first gland 20 and the valve stem 4. A second gland 24 is installed on the first gland 20 above the third seal 23. The cross section of the second gland 24 is I-shaped. The upper end area of ​​the second gland 24 is larger than the lower end area of ​​the second gland 24. The lower end of the second gland 24 is fixedly connected to the first gland 20, and the upper end of the second gland 24 is fixedly connected to the guide plate 6. The second gland 24 is connected between the first gland 20 and the guide plate 6, supports the guide plate 6, and fixes and seals the first gland 20 and the valve stem 4.

[0020] A fourth seal 25 is provided between the valve seat 2 and the valve body 1 .

[0021] The utility model can facilitate the disassembly of the valve, and the use of the above-mentioned seal can enhance the sealing performance of the valve as a whole and prolong the service life of the valve. The second gland 24 and the guide plate 6, the second gland 24 and the first gland 20, and the first gland 20 and the valve body 1 are all fixed by bolts to facilitate disassembly.

[0022] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A self-cleaning flush-free stop valve, comprising a valve body, a valve seat, a valve core, a valve stem, a hand wheel and a guide plate, characterized in that: A water inlet and a water outlet are respectively provided at two ends of the valve body, the water inlet is connected to a low-position pressure relief chamber through a water inlet channel, a valve seat is installed in the valve body above the pressure relief chamber, the middle part of the valve seat forms an expansion chamber connected to the pressure relief chamber, and the diameter of the expansion chamber is smaller than the diameter of the pressure relief chamber; a valve cage is installed at the periphery of the valve seat, a cage opening is opened on the side of the valve cage, and the cage opening is connected to the water outlet through the water outlet channel; the interior of the valve cage is a brushless chamber, and the valve core is in the brushless chamber; an extension rod is fixed to the lower end of the valve core, the extension rod passes through the expansion chamber and extends into the pressure relief chamber, and a paddle is rotatably connected to the end of the extension rod.

2. The self-cleaning flush-free stop valve according to claim 1, characterized in that: A stopper is installed between the valve stem and the valve cage; a first gland is installed above the valve cage, a first seal is provided between the first gland and the valve body, and a second seal is provided between the first gland and the stopper.

3. The self-cleaning flush-free stop valve according to claim 2, characterized in that: A third seal is provided between the first gland and the valve stem.

4. The self-cleaning flush-free stop valve according to claim 3, characterized in that: A second gland is installed on the first gland above the third seal, the cross section of the second gland is I-shaped, the upper end area of ​​the second gland is larger than the lower end area of ​​the second gland, the lower end of the second gland is fixedly connected to the first gland, and the upper end of the second gland is fixedly connected to the guide plate.

5. The self-cleaning flush-free stop valve according to claim 1, characterized in that: A fourth seal is provided between the valve seat and the valve body.

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