CN204253950U - A kind of leakage-proof backflow-proof valve - Google Patents

Abstract

The utility model provides an anti-drip and backflow prevention valve, which includes a valve. An anti-drip check valve is arranged at the water outlet or water inlet of the valve. The anti-drip check valve includes a valve plate, a return device and a valve seat. , the valve seat is fixed in the pipeline of the valve, the outer side of the valve plate is connected with the valve seat through the restoring device, the inner side of the valve plate is a sealing surface, and the sealing surface is provided with a sealing The edge of the sealing pad is provided with a circle of semicircular protrusions, and a sealing plate is provided in the valve body. The sealing plate is a ring-shaped protrusion inside the valve body, which can be sealed by contacting the sealing surface of the valve plate. For the water flow channel, an annular baffle is arranged on the outer side of the sealing plate, and a groove is arranged on the inner wall of the annular baffle. The beneficial effect of the utility model is that the pressure water in the pipeline is strictly limited to flow in one direction only, the backflow of the medium is effectively prevented, and leakage of the downstream pipeline can be prevented.

Description

An anti-drip and backflow prevention valve

technical field

The invention belongs to the field of valves, and in particular relates to an anti-drip and backflow prevention valve.

Background technique

At present, due to the limitation of the sensitivity of the water meter, when the flow rate is small to a certain extent, the water meter cannot measure the flow rate, thus causing losses to the water supplier. Improve the measurement accuracy of the water meter to achieve the effect of drip measurement, and effectively curb the loss of water fees receivable by the charging department due to "fine water and long flow". The anti-drip problem not only exists in my country, but also existed in economically developed countries, and special countermeasures have been studied. Tap water anti-drip has gone beyond the scope of economic benefits and production costs, and has become a government consensus on saving resources and cherishing national wealth, and it is a key problem for national industry associations to focus on.

And the common valve can only simply control the opening and closing of the fluid channel, but cannot limit the flow direction of the fluid, and cannot prevent and avoid the backflow phenomenon that is prone to occur during the municipal tap water supply process. A valve that reverses fluid flow and restricts the direction of fluid flow.

Contents of the invention

The invention provides a valve capable of preventing dripping, preventing fluid backflow and restricting fluid flow direction.

In order to solve the above technical problems, the technical solution adopted by the invention is: an anti-drip and backflow prevention valve, including a valve, an anti-drip check valve is arranged at the water outlet or water inlet of the valve, and the anti-drip check valve The return valve includes a valve plate, a return device and a valve seat, the valve seat is fixed in the pipeline of the valve, the outside of the valve plate is connected with the valve seat through the return device, and the inside of the valve plate is The sealing surface, the sealing surface is provided with a sealing gasket, the edge of the sealing gasket is provided with a circle of semicircular protrusions, and the valve body is provided with a sealing plate, the sealing plate is an annular protrusion inside the valve body, which can pass through It is in contact with the sealing surface of the valve plate to seal the water flow channel. The outer side of the sealing plate is provided with an annular baffle, and the inner wall of the annular baffle is provided with a groove. The opening diameter of the annular baffle is larger than the diameter of the sealing surface, and the diameter of the sealing gasket is larger than the opening diameter of the annular baffle.

Preferably, a check valve is also provided at the water inlet or water outlet of the valve.

Preferably, the valve plate can move axially within the valve seat.

Preferably, both the anti-drip check valve and the check valve are located at the water outlet of the valve, the anti-drip check valve is on the outside, and the sealing plate, annular baffle and The valve seat of the check valve is integrated.

Preferably, the sealing plate is further provided with an annular protrusion on a side close to the sealing surface of the valve plate, and the annular protrusion can directly contact with the sealing surface of the valve plate to achieve sealing.

Preferably, the opening of the annular baffle is provided with chamfers to facilitate the entry of the gasket.

Preferably, the valve is one of gate valve and ball valve.

Preferably, the gasket is an elastic gasket.

Preferably, the sealing pad is a rubber pad.

The advantages and positive effects of the invention are: on the basis of satisfying all the functions of ordinary valves, the invention strictly limits the pressure water in the pipeline to flow in one direction, effectively prevents the backflow of the medium, and prevents the downstream pipeline from running Drip leakage (the water meter can measure a small amount of drip leakage), save installation space and installation cost, and protect the safety of water supply.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings that need to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description It is only an embodiment of the present invention, and those skilled in the art can obtain other drawings according to these drawings without any creative effort.

Fig. 1 is the structural representation that the present invention creates;

Fig. 2 is a partial structural schematic diagram of the invention.

Detailed ways

The technical solutions in the embodiments of the invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of them. example. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the following description, a lot of specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways that are different from those described here, and those skilled in the art can do so without departing from the content of the present invention. Under the circumstances, do similar promotion, so the present invention is not limited by the specific embodiments disclosed below.

Secondly, the present invention is described in detail in conjunction with schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of illustration, the cross-sectional view showing the structure of the device will not be partially enlarged according to the general scale, and the schematic diagram is only an example, which is hereby The protection scope of the invention should not be limited. In addition, the three-dimensional space dimensions of length, width and height should be included in actual production.

As shown in Figures 1 and 2, the present invention includes a valve 1, an anti-drip check valve is provided at the water outlet of the valve 1, and the anti-drip check valve includes a valve plate 2, a return device 3 and a valve Seat 4, the valve seat 4 is fixed in the pipeline of the valve 1, the outer side of the valve plate 2 is connected with the valve seat 4 through the recovery device 3, the inner side of the valve plate 2 is a sealing surface, The sealing surface is provided with a sealing gasket 5, the edge of the sealing gasket 5 is provided with a circle of semicircular protrusions 6, and a sealing plate 7 is arranged in the valve body, and the sealing plate 7 is an annular protrusion inside the valve body. The water flow channel can be sealed by contacting the sealing surface of the valve plate 2, the outer side of the sealing plate 7 is provided with an annular baffle 8, the inner wall of the annular baffle 8 is provided with a groove, and the ring The diameter of the opening of the annular baffle 8 is greater than the diameter of the sealing surface, and the diameter of the gasket 5 is greater than the diameter of the opening of the annular baffle 8. When the sealing plate 7 is in contact with the sealing surface of the valve plate 2 to seal the water flow channel, the edge of the sealing gasket 5 is embedded in the groove on the inner wall of the annular baffle 8 to cooperate to form a seal.

The water outlet of the valve 1 is also provided with a check valve, the anti-drip check valve is located on the outside, the sealing plate 7 and the annular baffle plate 8 of the anti-drip check valve are connected with the The valve seat is integrated.

The recovery device 3 is a spring. One end of the spring is embedded in the groove on the valve plate 2 , and the other end is stuck on the protrusion on the valve seat 4 . The valve plate 2 is provided with a positioning rod, and the valve seat 4 is provided with a positioning hole, and the positioning rod can move along the positioning hole so that the valve plate 2 can be pivoted in the valve seat 4. to move.

The sealing plate 7 is further provided with an annular protrusion on a side close to the sealing surface of the valve plate 2 , and the annular protrusion can directly contact with the sealing surface of the valve plate 2 to realize sealing.

The opening of the annular baffle 8 is provided with chamfers to facilitate the entry of the sealing gasket 5 .

The valve 1 is a gate valve. The gasket 5 is a rubber gasket.

The edge of the sealing gasket 5 is provided with a circle of semicircular protrusions 6, and the opening of the annular baffle 8 is provided with chamfers, so that the sealing gasket 5 is easily embedded in the concave hole on the inner wall of the annular baffle 8. groove, fit to form a seal. Because the protrusion 6 is stuck in the groove, a larger thrust is required for the gasket 5 to break away from the groove, that is, when a large pressure difference is generated at both ends of the valve plate 2, the gasket 5 can leave the groove. At this time, the inlet water to pass through.

When dripping occurs downstream of the water meter, the pressure at the outlet end of the valve drops slowly. At this time, the gasket 5 is still in the groove of the valve seat, and the pressure water at the inlet end will not flow through the valve. When the pressure at the outlet end drops to a certain value due to dripping, the sealing gasket 5 will quickly break away from the valve seat groove, and a sufficient amount of inlet pressure water will quickly enter the water meter at the outlet end of the valve, and the water meter will rotate to generate metering. When the outlet pressure of the valve returns to a certain value, the gasket 5 automatically enters into the groove under the action of the return spring 2 to form a seal.

The design of two check valves placed side by side can avoid the reverse flow phenomenon caused by the damage of one of the check valves, and it is safer and the check effect is better.

The advantages and positive effects of the invention are: on the basis of satisfying all the functions of ordinary valves, the invention achieves the effect of drip metering, effectively curbs the loss of water fees receivable by the charging department caused by "thin water and long flow", and strictly The pressure water in the pipeline can only flow in one direction, which effectively prevents the medium from flowing backward, saves installation space and installation costs, and protects the safety of water supply.

An embodiment of the present invention has been described in detail above, but the content described is only a preferred embodiment of the present invention and cannot be considered as limiting the implementation scope of the present invention. All equivalent changes and improvements made according to the application scope of the present invention shall still belong to the scope covered by the patent of the present invention.

Claims (9)

1. a leakage-proof backflow-proof valve, comprise valve (1), it is characterized in that: the water outlet of described valve (1) or water inlet are provided with a leakage-preventing check valve, described leakage-preventing check valve comprises valve plate (2), recovery device (3) and valve seat (4), described valve seat (4) is fixed in the pipeline of described valve (1), the outside of described valve plate (2) is connected with described valve seat (4) by described recovery device (3), the inner side of described valve plate (2) is sealing surface, described sealing surface is provided with sealing gasket (5), the edge of described sealing gasket (5) is provided with the semi-circular projection of a circle (6), sealing plate (7) is provided with in valve body, the ring-type that described sealing plate (7) is valve inner is given prominence to, by contacting with the sealing surface of described valve plate (2), sealing flow channel, the outside of described sealing plate (7) is provided with ring-shaped baffle (8), the inwall of described ring-shaped baffle (8) is provided with groove, the opening diameter of described ring-shaped baffle (8) is greater than the diameter of described sealing surface, the diameter of described sealing gasket (5) is greater than the opening diameter of described ring-shaped baffle (8).

2. leakage-proof backflow-proof valve according to claim 1, is characterized in that: the water intake of described valve (1) or water outlet are also provided with a safety check.

3. leakage-proof backflow-proof valve according to claim 1 and 2, is characterized in that: described valve plate (2) can axially move in described valve seat (4).

4. leakage-proof backflow-proof valve according to claim 2, it is characterized in that: described leakage-preventing check valve and safety check are all positioned at the water outlet of described valve (1), described leakage-preventing check valve is in outside, and sealing plate (7), the ring-shaped baffle (8) of described leakage-preventing check valve are integrated with the valve seat of described safety check.

5. leakage-proof backflow-proof valve according to claim 1 and 2, it is characterized in that: described sealing plate (7) is also provided with annular projection in the side of the sealing surface near described valve plate (2), described annular projection can directly contact with the sealing surface of described valve plate (2), to realize sealing.

6. leakage-proof backflow-proof valve according to claim 1 and 2, is characterized in that: the opening of described ring-shaped baffle (8) is provided with chamfering, is convenient to entering of sealing gasket (5).

7. leakage-proof backflow-proof valve according to claim 1 and 2, is characterized in that: described valve (1) is gate valve, one in ball valve.

8. leakage-proof backflow-proof valve according to claim 1 and 2, is characterized in that: described sealing gasket (5) is elastic sealing gasket.

9. leakage-proof backflow-proof valve according to claim 8, is characterized in that: described sealing gasket (5) is rubber pad.