Spherical check valve

Abstract

According to the technical scheme, the spherical check valve is characterized by comprising a valve body and a valve clack, a water outlet channel and a water inlet channel are formed in the valve body, and a groove for partially containing the valve clack is formed in the inner wall of the valve body; the groove comprises a curved surface bottom connected with the inner wall of the water outlet channel, an inclined surface bottom connected with the curved surface bottom and a groove wall connecting the inclined surface bottom with the water inlet channel, the curved surface bottom is attached to the outer wall of the valve clack, and the end, connected with the groove wall, of the inclined surface bottom is lower than the end, connected with the curved surface bottom, of the inclined surface bottom. The connecting position of the groove wall and the water inlet channel abuts against the outer wall of the valve clack, an impurity containing cavity located on one side of the vertical face where the ball center of the valve clack is located is defined by the groove wall, the slope bottom and the outer wall of the valve clack jointly, and an impurity discharging hole communicated with the impurity containing cavity is formed in the valve body and is in threaded connection with a sealing bolt. The end opening, connected with the impurity containing cavity, of the impurity discharging hole is close to the connecting position of the inclined face bottom and the groove wall. The problem that in the prior art, impurities or dirt is accumulated in the valve body, and consequently backflow of the valve clack cannot be prevented is solved.

Description

Technical Field

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

[0002] A check valve refers to a valve in which the valve flap is opened or closed automatically by the thrust generated by the flow of the medium to prevent the reverse flow of the medium. The check valve is mainly used in pipelines where the medium flows in one direction only, allowing the medium to flow in one direction only to prevent accidents. A spherical check valve refers to a check valve that uses a spherical ball as the valve flap. Its principle is that under the action of the thrust generated by the flow of the medium, the valve flap can roll along a set direction on the slideway in the valve body, so as to realize the effect of opening or closing the valve through the valve flap. When the spherical check valve is working normally, the fluid flows from the inlet side to the outlet side; when the pressure on the inlet side is lower than that on the outlet side, the valve flap automatically closes under the action of factors such as the fluid pressure difference and its own gravity to prevent the reverse flow of the fluid. In the existing spherical check valve, a groove that can fit with a part of the outer wall of the valve flap is provided on the inner wall of the valve body. During long-term use, dirt or solid impurities will accumulate in the groove and be difficult to clean. As a result, the height of the valve flap in the valve body will increase, causing the valve flap to easily move randomly in the valve body and the valve flap cannot block the inlet side in time, or even cannot block the inlet side, and the anti-backflow effect is poor. Summary of the Utility Model

[0003] Aiming at the deficiencies of the existing technology, the purpose of the present utility model is to provide a spherical check valve that is convenient for cleaning impurities and has a stable anti-backflow effect.

[0004] To achieve the above purpose, the present utility model provides the following technical solution: A spherical check valve, including a valve body and a valve flap located in the valve body. The valve body is provided with a water outlet channel and a water inlet channel that can communicate with each other. A groove for accommodating a part of the valve flap and adjacent to the water inlet channel is provided on the inner wall of the valve body. The groove includes a curved surface bottom that is connected to the inner wall of the water outlet channel and is arc-shaped, an inclined surface bottom that is connected to the curved surface bottom and is inclined downward relative to the horizontal plane, and a groove wall that connects the inclined surface bottom and the water inlet channel together. The curved surface bottom fits with the outer wall of the valve flap. The height of the end of the inclined surface bottom connected to the groove wall is lower than the height of the end of the inclined surface bottom connected to the curved surface bottom. The connection between the groove wall and the water inlet channel touches the top of the outer wall of the valve flap. The groove wall, the inclined surface bottom and the outer wall of the valve flap jointly enclose a impurity-containing cavity on one side of the vertical plane where the center of the valve flap is located. The valve body is provided with a waste discharge hole that communicates with the impurity-containing cavity. The waste discharge hole is threadedly connected with a sealing bolt for preventing the leakage of the medium. The port of the waste discharge hole connected to the impurity-containing cavity is adjacent to the connection between the inclined surface bottom and the groove wall.

[0005] As a further improvement of the present utility model, the curved surface bottom includes a separation part that is connected to the water outlet channel and does not fit with the valve flap, and a fitting part that connects the separation part and the inclined surface bottom and can fit with the valve flap.

[0006] As a further improvement of the present utility model, a plurality of sealing washers are arranged between the sealing bolt and the valve body.

[0007] As a further improvement of the present utility model, the length direction of the impurity discharge hole is perpendicular to the horizontal plane.

[0008] As a further improvement of the present utility model, a plurality of relaxation rods capable of extending into the impurity-containing cavity are arranged on the end face of the sealing bolt extending into the impurity discharge hole.

[0009] The beneficial effects of the present utility model: The impurities or dirt are guided to the impurity-containing cavity on one side of the central axis of the valve flap through the inclined bottom, so that the impurities can be discharged from the valve body through the impurity discharge hole. Such a design can regularly clean the dirt or impurities in the groove compared with the prior art, thereby ensuring the stability of the position of the valve flap in the groove and ensuring the effective use of the anti-backflow function of the present utility model; The design of the inclined bottom and the impurity-containing cavity can effectively guide the impurities or dirt to the impurity-containing cavity compared with the design of processing the bottom surface of the groove into an arc shape that fully fits the outer wall of the valve flap in the prior art, slowing down the accumulation of impurities or dirt at the contact position between the curved bottom surface and the valve flap, further avoiding the influence of impurities or dirt on the position of the valve flap, and the accumulation of dirt or impurities in the impurity-containing cavity can extend the maintenance period and thus reduce the maintenance frequency. Description of the Drawings

[0010] Figure 1 is a schematic structural diagram of the present utility model;

[0011] Figure 2 is Figure 1 the enlarged view at A in

[0012] Reference numerals: 1. Valve body; 11. Water outlet channel; 12. Water inlet channel; 13. Impurity discharge hole; 2. Valve flap; 3. Groove; 31. Curved bottom surface; 32. Inclined bottom surface; 33. Groove wall; 34. Separation part; 35. Fitting part; 4. Impurity-containing cavity; 5. Sealing bolt; 6. Sealing washer; 7. Relaxation rod. Detailed Description of the Embodiment

[0013] The following further details the present utility model in conjunction with the drawings and embodiments. Wherein, the same components are denoted by the same reference numerals.

[0014] Referring to Figure 1 and Figure 2 as shown, a spherical check valve of this embodiment includes a valve body 1 and a valve flap 2 located inside the valve body 1. The valve body 1 is provided with a water outlet channel 11 and a water inlet channel 12 that can communicate with each other. A groove 3 for partially accommodating the valve flap 2 and adjacent to the water inlet channel 12 is arranged on the inner wall of the valve body 1;

[0015] Based on the foregoing prior art, the groove 3 includes a groove bottom, a groove wall 33 located at one end of the groove bottom and connected to the water inlet passage 12, and two side walls respectively located on both sides of the groove bottom. The groove bottom is composed of an arc-shaped curved bottom 31 and an inclined bottom 32 that slopes downward relative to the horizontal plane. The inclined bottom 32 is tangent to one end of the curved bottom 31. One end of the curved bottom 31 is connected to the inner wall of the water outlet passage 11. One end of the inclined bottom 32 is connected to the groove wall 33. The plane where the groove wall 33 is located is perpendicular to the horizontal plane. The height of the end of the inclined bottom 32 connected to the groove wall 33 is lower than the height of the end of the inclined bottom 32 connected to the curved bottom 31. The valve body 1 is provided with a drain hole 13. One end of the drain hole 13 communicating with the inner cavity of the valve body 1 is adjacent to the connection between the inclined bottom 32 and the groove wall 33. A sealing bolt 5 for preventing the medium from leaking is threadedly connected to the drain hole 13. The length direction of the drain hole 13 can be the same as the extending direction of the inclined bottom 32;

[0016] In the initial state, the water inlet passage 12 is in communication with the water outlet passage 11. A part of the valve flap 2 is located in the groove 3. The curved bottom 31 is in contact with the outer wall of the valve flap 2. The connection between the groove wall 33 and the water inlet passage 12 abuts against the outer wall of the valve flap 2. The groove wall 33, the inclined bottom 32, the outer wall of the valve flap 2, and the two side walls jointly enclose a dirt-containing cavity 4 located on one side of the vertical plane where the center of the valve flap 2 is located. The dirt-containing cavity 4 is in communication with one end of the drain hole 13. When the pressure of the medium at the water inlet passage 12 is less than the pressure of the medium at the water outlet passage 11, the medium at the water outlet passage 11 flows backward and pushes the valve flap 2. The valve flap 2 rotates clockwise with the connection between the groove wall 33 and the water inlet passage 12 as the fulcrum until the valve flap 2 completely blocks the water inlet passage 12 and the medium cannot flow backward. The medium will flow into the groove 3. The impurities or dirt in the medium will move along the inclined bottom 32 to the lowest end of the inclined bottom 32 and accumulate. As the pressure at the water inlet passage 12 is greater than the pressure at the water outlet passage 11, the valve flap 2 separates from the water inlet passage 12 and returns to the initial state. The dirt or impurities are limited in the dirt-containing cavity 4. The maintenance personnel can periodically screw out the sealing bolt 5 from the drain hole 13. The dirt or impurities move along the drain hole 13 to the outside of the valve body 1 under the action of gravity or the push of the internal medium. When it is observed that the dirt or impurities are in trace amounts or no longer discharged from the valve body 1, the sealing bolt 5 is screwed back into the drain hole 13;

[0017] Such a design can regularly clean the dirt or impurities in the groove 3 compared with the prior art, thereby ensuring the stability of the position of the valve flap 2 in the groove 3 and ensuring the effective use of the anti-backflow function of the present invention; the design of the inclined bottom 32 and the dirt-containing cavity 4 can effectively guide the impurities or dirt into the dirt-containing cavity 4 compared with the design of processing the bottom surface of the groove 3 into an arc shape that fully fits the outer wall of the valve flap 2 in the prior art, slowing down the accumulation of impurities or dirt at the contact position between the curved bottom 31 and the valve flap 2, further avoiding the influence of impurities or dirt on the position of the valve flap 2. The accumulation of dirt or impurities in the dirt-containing cavity 4 can extend the maintenance period and thus reduce the maintenance frequency.

[0018] As a specific implementation of the improvement, refer to Figure 1 and Figure 2 As shown, the center of the arc-shaped curved bottom 31 is eccentrically arranged with the center of the ball of the valve flap 2. Then, the arc-shaped curved bottom 31 includes a separation part 34 that is connected to the water outlet channel 11 and does not fit with the valve flap 2, and a fitting part 35 that connects the separation part 34 and the inclined bottom 32 and can fit with the valve flap 2. Such a design can facilitate the medium to enter the gap between the separation part 34 and the valve flap 2 and push the valve flap 2 to move compared with the design where the curved bottom 31 fully and sufficiently fits with the outer wall of the valve flap 2, shortening the time required for the valve flap 2 to block the water inlet channel 12, thereby improving the efficiency of realizing the anti-backflow function.

[0019] As a specific implementation of the improvement, refer to Figure 2 As shown, a plurality of sealing washers 6 are arranged between the sealing bolt 5 and the valve body 1. Such a design can further improve the sealing performance between the valve body 1 and the sealing bolt 5, further improve the compactness between the sealing bolt 5 and the valve body 1, and at the same time reduce the wear between the sealing bolt 5 and the valve body 1.

[0020] As a specific implementation of the improvement, refer to Figure 1 and Figure 2 As shown, the length direction of the impurity discharge hole 13 is perpendicular to the horizontal plane, and dirt or impurities can quickly fall from the impurity discharge hole 13. Such a design can slow down the adhesion of dirt or impurities to the thread of the impurity discharge hole 13 and affect the smooth connection between the sealing bolt 5 and the impurity discharge hole 13 compared with the design where the length direction of the impurity discharge hole 13 is inclined downward relative to the horizontal plane.

[0021] As a specific implementation of the improvement, refer to Figure 2 As shown, a plurality of relaxation rods 7 that can extend into the impurity-containing cavity 4 are arranged on the end face of the sealing bolt 5 extending into the impurity discharge hole 13. The number and distribution positions of the relaxation rods 7 are designed according to actual requirements. When the sealing bolt 5 rotates relative to the valve body 1, the relaxation rods 7 can stir the dirt or impurities in the impurity-containing cavity 4 while gradually withdrawing from the impurity-containing cavity 4, so that the accumulated dirt or impurities are locally loosened, facilitating the impurities or dirt to be washed away by the medium and enter the impurity discharge hole 13; before the sealing bolt 5 is separated from the impurity discharge hole 13, the impurities or dirt entering the impurity discharge hole 13 will be continuously stirred by the relaxation rods 7, avoiding the situation where the impurities or dirt fill and stagnate in the impurity discharge hole 13 under the medium pressure.

[0022] The above are only the preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited to the above embodiments. All technical solutions falling within the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present utility model should also be regarded as within the protection scope of the present utility model.

Claims

1. A spherical check valve, comprising a valve body (1) and a valve flap (2) located inside the valve body (1). The valve body (1) is provided with a water outlet channel (11) and a water inlet channel (12) that can communicate with each other. A groove (3) for partially accommodating the valve flap (2) and adjacent to the water inlet channel (12) is provided on the inner wall of the valve body (1), and it is characterized in that: The groove (3) includes a curved surface bottom (31) that is connected to the inner wall of the water outlet channel (11) and is arc-shaped, an inclined surface bottom (32) that is connected to the curved surface bottom (31) and is inclined downward relative to the horizontal plane, and a groove wall (33) that connects the inclined surface bottom (32) to the water inlet channel (12). The curved surface bottom (31) fits against the outer wall of the valve flap (2). The height of the end of the inclined surface bottom (32) where it is connected to the groove wall (33) is lower than the height of the end of the inclined surface bottom (32) where it is connected to the curved surface bottom (31). The connection between the groove wall (33) and the water inlet channel (12) touches the outer wall of the valve flap (2). The groove wall (33), the inclined surface bottom (32), and the outer wall of the valve flap (2) together enclose a foreign matter chamber (4) located on one side of the vertical plane where the center of the valve flap (2) is located. The valve body (1) is provided with a drain hole (13) that communicates with the foreign matter chamber (4). A sealing bolt (5) for preventing the leakage of the medium is threadedly connected to the drain hole (13). The port of the drain hole (13) connected to the foreign matter chamber (4) is close to the connection between the inclined surface bottom (32) and the groove wall (33).

2. The ball check valve according to claim 1, characterized in that: The curved surface bottom (31) includes a separation part (34) that is connected to the water outlet channel (11) and does not fit against the valve flap (2), and a fitting part (35) that connects the separation part (34) to the inclined surface bottom (32) and can fit against the valve flap (2).

3. A spherical check valve according to claim 1 or 2, characterized in that: A number of sealing washers (6) are provided between the sealing bolt (5) and the valve body (1).

4. A spherical check valve according to claim 1 or 2, characterized in that: The length direction of the drain hole (13) is perpendicular to the horizontal plane.

5. A spherical check valve according to claim 1 or 2, characterized in that: Multiple relaxation rods (7) that can extend into the foreign matter chamber (4) are provided on the end face of the sealing bolt (5) that extends into the drain hole (13).

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