Angle valve with backflow prevention structure

Abstract

The utility model provides an angle valve with a backflow prevention structure, and belongs to the field of water stop valves. The valve comprises a valve shell, a switch control cavity is formed in the valve shell, the switch control cavity is communicated with a water inlet and a water outlet, a valve shaft is arranged in the switch control cavity, the outer surface of the valve shell is sleeved with a hand wheel, the hand wheel is rotationally connected with the valve shell, and the hand wheel extends into the switch control cavity to be connected with the valve shaft. The end, away from the hand wheel, of the valve shaft is connected with a water stopping column, the water stopping column is in threaded connection with the valve shaft, the water stopping column can be close to or away from the water inlet along the switch control cavity, the water stopping column is further provided with a backflow preventing structure, and the backflow preventing structure can block the water inlet. The backflow prevention structure can move towards the direction close to the water inlet when the water inlet is in a negative pressure state.

Description

Technical Field

[0001] The utility model belongs to the field of water stop valves, in particular to an angle valve with a backflow prevention structure. Background Art

[0002] Water valves are used in existing home appliances such as washing machines, dishwashers, and smart toilets to control the flow of water. Water pressure varies significantly across regions, and in some areas, it can be unstable. When there is no water pressure, unstable water pressure, or a sharp drop in inlet pressure, negative pressure is generated at the inlet and outlet of the appliance. This negative pressure creates a siphon effect, causing water to flow back through the appliance, contaminating the water resources at the inlet.

[0003] Although various technical solutions have been adopted in the prior art to address issues such as water backflow, such as installing a check valve or float at the water inlet, the drawback of installing a check valve at the water inlet is that, during the process of water flowing through the water valve, the water pressure at the water inlet is the highest, while the water pressure at the water outlet is lower than that at the water inlet. Because the check valve is installed at the water inlet, water can easily displace the check valve, causing it to leak. A drawback of the float structure is that the float type controls the sealing performance based on the return water pressure. If the return water pressure is insufficient, the sealing effect is very poor, and it cannot effectively prevent sewage backflow.

[0004] For example, a Chinese invention patent discloses an anti-backflow water inlet valve [application number CN202121419290.5], which includes a water inlet valve body and a vertical water outlet cylinder. The water inlet valve body includes a first water outlet. The vertical water outlet cylinder includes an inner cavity, a water inlet connected to the inner cavity, a vacuum breaker, and a second water outlet. The water inlet is connected to the first water outlet. A vertical partition is provided in the inner cavity to form a water outlet cavity connected to the second water outlet and a water inlet cavity connected to the water inlet. There is a gap between the top inner wall of the vertical water outlet cylinder and the top of the vertical partition, so that the water outlet cavity and the water inlet cavity are connected to each other; the vacuum breaker is located above the top of the vertical partition. However, this technical solution uses a vacuum method with a poor sealing effect and cannot effectively prevent sewage backflow. Utility Model Content

[0005] The purpose of the utility model is to provide an angle valve with an anti-backflow structure in order to solve the above problems.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An angle valve with an anti-backflow structure includes a valve housing, a switch control chamber is provided in the valve housing, the switch control chamber is connected to the water inlet and the water outlet, a valve shaft is provided in the switch control chamber, and a handwheel is sleeved on the outer surface of the valve housing of the valve shaft, the handwheel is rotatably connected to the valve housing and the handwheel extends into the switch control chamber and is connected to the valve shaft, a water stop column is connected to the end of the valve shaft away from the handwheel, the water stop column is threadedly connected to the valve shaft, the water stop column can approach or move away from the water inlet along the switch control chamber, the water stop column is also provided with an anti-backflow structure, the anti-backflow structure can block the water inlet, and the anti-backflow structure will move toward the water inlet when the water inlet is in a negative pressure state.

[0008] In the above-mentioned angle valve with anti-backflow structure, the anti-backflow structure includes an anti-backflow column that is sleeved on the outside of the water stop column and slidably connected to the water stop column. An elastic thrust structure is provided between the water stop column and the anti-backflow column. The elastic thrust structure can drive the anti-backflow column to move toward the direction close to the water inlet.

[0009] In the above-mentioned angle valve with anti-backflow structure, a sealing gasket is provided at one end of the anti-backflow column close to the water inlet, and the diameter of the sealing gasket is larger than the aperture of the water inlet.

[0010] In the above-mentioned angle valve with anti-backflow structure, the elastic thrust structure is a spring, and the spring is always in a compressed state.

[0011] In the above-mentioned angle valve with anti-backflow structure, the water stop column is composed of a main column and a secondary column, the main column is threaded with the valve shaft, the anti-backflow column is sleeved and slides on the outer surface of the secondary column, the bottom of the main column is provided with a built-in groove, the secondary column is arranged in the built-in groove and extends out of the built-in groove, and the spring is arranged outside the anti-backflow column and extends into the built-in groove and resists against the inner wall of the built-in groove.

[0012] In the above-mentioned angle valve with anti-backflow structure, a limiting groove is provided at one end of the anti-backflow column close to the water inlet, and the sealing gasket is arranged in the limiting groove and extends out of the limiting groove.

[0013] In the above-mentioned angle valve with anti-backflow structure, a limiting shaft is provided in the limiting groove, the sealing gasket is sleeved outside the limiting shaft and the limiting shaft passes through the sealing gasket, the limiting shaft is provided with a raised clamping surface, and the upper and lower outer surfaces of the sealing gasket are respectively against the inner wall of the limiting groove and the clamping surface.

[0014] In the above-mentioned angle valve with anti-backflow structure, the outer surface of the valve housing at the water inlet and the water outlet has threads.

[0015] In the above-mentioned angle valve with anti-backflow structure, the handwheel is provided with an inner ring, the inner ring extends into the valve housing and is rotatably connected thereto, and the outer surface of the valve housing is provided with an outer ring, the outer ring extends into the handwheel and is rotatably connected thereto.

[0016] In the above-mentioned angle valve with anti-backflow structure, the outer surface of the hand wheel is provided with a recessed hand gripping area.

[0017] Compared with the existing technology, the advantages of this utility model are:

[0018] 1. When there is no water flowing into the water inlet, negative pressure will be generated at the water inlet, which will cause water to flow back from the water outlet. Therefore, when the water inlet is in a negative pressure state, the anti-backflow structure moves toward the water inlet and blocks the water inlet to prevent water from flowing back.

[0019] 2. If the spring is compressed and produces a large deformation, the bent spring will press against the inner wall of the built-in groove to prevent the spring from further deformation, so that the spring is in a controllable deformation state.

[0020] 3. The inner wall of the limiting groove and the clamping surface further prevent the sealing gasket from bending when squeezed, which causes the sealing gasket to tilt. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the entire utility model;

[0022] Figure 2 yes Figure 1 Schematic diagram of the internal structure;

[0023] Figure 3 yes Figure 2 Structural diagram of the middle anti-backflow structure when it is working.

[0024] In the figure: valve housing 10, switch control chamber 11, water inlet 12, water outlet 13, valve shaft 14, handwheel 15, water stop column 16, anti-backflow structure 17, anti-backflow column 18, sealing gasket 19, spring 20, main column 21, secondary column 22, built-in groove 23, shape-limiting groove 24, shape-limiting shaft 25, clamping surface 26, inner ring 27, outer ring 28, and hand-grip area 29. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0026] The utility model provides an angle valve with an anti-backflow structure, combined with Figure 1-3As shown, it includes a valve housing 10, a switch control chamber 11 is provided in the valve housing 10, and the switch control chamber 11 is connected with the water inlet 12 and the water outlet 13. A valve shaft 14 is provided in the switch control chamber 11, and a handwheel 15 is provided on the outer surface of the valve housing 10 of the valve shaft 14. The handwheel 15 is rotatably connected to the valve housing 10 and the handwheel 15 extends into the switch control chamber 11 and is connected to the valve shaft 14. A water stop column 16 is connected to the end of the valve shaft 14 away from the handwheel 15, and the water stop column 16 is screwed to the valve shaft 14. The water stop column 16 can approach or move away from the water inlet 12 along the switch control chamber 11. The water stop column 16 is also provided with a backflow prevention structure 17. The backflow prevention structure 17 can block the water inlet 12. The backflow prevention structure 17 will move toward the water inlet 12 when the water inlet 12 is in a negative pressure state.

[0027] In this embodiment, when the angle valve is not in use, the handwheel 15 is turned to rotate the valve shaft 14, thereby screwing the water stop column 16 close to the water inlet 12 and blocking the water inlet 12. When water needs to be admitted, the handwheel 15 is turned to move the water stop column 16 in the direction away from the water inlet 12. Due to the high water pressure, water will flow out through the water outlet 13. However, when no water enters the water inlet 12, negative pressure will be generated in the water inlet 12, which will cause water to flow back from the water outlet 13. Therefore, when the water inlet 12 is in a negative pressure state, the anti-backflow structure 17 moves in the direction close to the water inlet 12 and blocks the water inlet 12 to prevent water from flowing back.

[0028] The backflow prevention structure 17 includes an anti-backflow column 18 which is sleeved on the outside of the water stop column 16 and is slidably connected to the water stop column 16. An elastic thrust structure is provided between the water stop column 16 and the anti-backflow column 18, and the elastic thrust structure can drive the anti-backflow column 18 to move toward the direction close to the water inlet 12.

[0029] In this embodiment, the elastic thrust structure pushes the anti-backflow column 18 to move closer to the water inlet 12 through the elastic force generated by it. When the angle valve is not used, the water stop column 16 will press the anti-backflow column 18 on the water inlet 12 to block the water inlet 12. When the angle valve is used, the space generated between the water stop column 16 and the water inlet 12 is for the anti-backflow column 18 to move. The water pressure generated by the water flow at the water inlet 12 will overcome the elastic thrust structure and push the anti-backflow column 18 away from the water inlet 12, and finally allow the water to flow normally to the water outlet 13. However, when the water inlet 12 is not flowing in and is in a negative pressure state, the elastic force generated by the elastic thrust structure pushes the anti-backflow column 18 close to the water inlet 12 and blocks the water inlet 12, thereby preventing water from flowing back.

[0030] A sealing gasket 19 is provided at one end of the anti-backflow column 18 close to the water inlet 12 . The diameter of the sealing gasket 19 is larger than the aperture of the water inlet 12 .

[0031] In this embodiment, the sealing gasket 19 is made of rubber. No matter when it is not in use or when the water inlet 12 is in a negative pressure state, the sealing gasket 19 can effectively block the water inlet 12 to prevent water from flowing.

[0032] The elastic thrust structure is a spring 20, and the spring 20 is always in a compressed state.

[0033] In this embodiment, the spring 20 has a simple structure, low procurement cost, is easy to install, and can provide reliable elastic force.

[0034] The water stop column 16 is composed of a main column 21 and a secondary column 22. The main column 21 is screwed to the valve shaft 14. The anti-backflow column 18 is sleeved and slides on the outer surface of the secondary column 22. The bottom of the main column 21 is provided with a built-in groove 23. The secondary column 22 is arranged in the built-in groove 23 and extends out of the built-in groove 23. The spring 20 is arranged outside the anti-backflow column 18 and extends into the built-in groove 23 and abuts against the inner wall of the built-in groove 23.

[0035] In this embodiment, if the spring 20 is compressed to generate a large deformation, the bent spring 20 will press against the inner wall of the built-in groove 23 to prevent the spring 20 from further deformation, so that the spring 20 is in a controllable deformation state.

[0036] A limiting groove 24 is provided at one end of the anti-backflow column 18 close to the water inlet 12 , and the sealing gasket 19 is disposed in the limiting groove 24 and extends out of the limiting groove 24 .

[0037] In this embodiment, when the sealing gasket 19 blocks the water inlet 12 , the sealing gasket 19 will be squeezed and deformed. The limiting groove 24 also helps to prevent the sealing gasket 19 from bending in the deformation direction, thereby preventing the water inlet 12 from leaking.

[0038] A limiting shaft 25 is provided in the limiting groove 24, the sealing gasket 19 is sleeved on the outside of the limiting shaft 25 and the limiting shaft 25 passes through the sealing gasket 19, the limiting shaft 25 is provided with a raised clamping surface 26, and the upper and lower outer surfaces of the sealing gasket 19 are respectively against the inner wall of the limiting groove 24 and the clamping surface 26.

[0039] In this embodiment, the inner wall of the limiting groove 24 and the clamping surface 26 further prevent the sealing gasket 19 from bending and deforming when squeezed, thereby preventing the sealing gasket 19 from tilting.

[0040] The outer surface of the valve housing 10 at the water inlet 12 and the water outlet 13 has threads.

[0041] In this embodiment, both the water inlet 12 and the water outlet 13 can be connected to external pipes through threads.

[0042] The handwheel 15 is provided with an inner ring 27, which extends into the valve housing 10 and is rotatably connected thereto. The outer surface of the valve housing 10 is provided with an outer ring 28, which extends into the handwheel 15 and is rotatably connected thereto.

[0043] In this embodiment, the hand wheel 15 is tightly connected to the valve housing 10 via the inner ring 27 and the outer ring 28 .

[0044] The working principle of the present utility model is as follows: the spring pushes the anti-backflow column 18 to move closer to the water inlet 12 through the elastic force generated by the spring. When the angle valve is not in use, the water stop column 16 presses the anti-backflow column 18 on the water inlet 12 to block the water inlet 12. When the angle valve is used, the space generated between the water stop column 16 and the water inlet 12 is for the anti-backflow column 18 to move. The water pressure generated by the water flow from the water inlet 12 will overcome the spring and push the anti-backflow column 18 away from the water inlet 12, and finally make the water flow normally to the water outlet 13. However, when the water inlet 12 is not filled with water and is in a negative pressure state, the elastic force generated by the spring pushes the anti-backflow column 18 close to the water inlet 12 and blocks the water inlet 12, thereby preventing water from flowing back.

[0045] The outer surface of the hand wheel 15 is provided with a recessed hand grip area 29 .

[0046] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0047] Although this article uses the valve housing 10, switch control chamber 11, water inlet 12, water outlet 13, valve shaft 14, handwheel 15, water stop column 16, anti-backflow structure 17, anti-backflow column 18, sealing gasket 19, spring 20, main column 21, secondary column 22, built-in groove 23, shape-limiting groove 24, shape-limiting shaft 25, card surface 26, inner ring 27, outer ring 28, hand-grip area 29, etc. more frequently, these terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. An angle valve with an anti-backflow structure, characterized in that: The invention comprises a valve housing (10), wherein a switch control chamber (11) is provided in the valve housing (10), wherein the switch control chamber (11) is communicated with a water inlet (12) and a water outlet (13), wherein a valve shaft (14) is provided in the switch control chamber (11), wherein a hand wheel (15) is sleeved on the outer surface of the valve housing (10), wherein the hand wheel (15) is rotatably connected to the valve housing (10) and the hand wheel (15) extends into the switch control chamber (11) and is connected to the valve shaft (14), wherein the valve shaft (14) A water stop column (16) is connected to the end away from the hand wheel (15), and the water stop column (16) is screwed to the valve shaft (14). The water stop column (16) can approach or move away from the water inlet (12) along the switch control chamber (11). The water stop column (16) is also provided with an anti-backflow structure (17). The anti-backflow structure (17) can block the water inlet (12). When the water inlet (12) is in a negative pressure state, the anti-backflow structure (17) will move toward the direction close to the water inlet (12).

2. The angle valve with anti-backflow structure according to claim 1, characterized in that: The backflow prevention structure (17) includes a backflow prevention column (18) which is sleeved on the outside of the water stop column (16) and slidably connected to the water stop column (16). An elastic thrust structure is provided between the water stop column (16) and the backflow prevention column (18). The elastic thrust structure can drive the backflow prevention column (18) to move toward the direction close to the water inlet (12).

3. The angle valve with anti-backflow structure according to claim 2, characterized in that: A sealing gasket (19) is provided at one end of the anti-backflow column (18) close to the water inlet (12), and the diameter of the sealing gasket (19) is larger than the aperture of the water inlet (12).

4. The angle valve with anti-backflow structure according to claim 2, characterized in that: The elastic thrust structure is a spring (20), and the spring (20) is always in a compressed state.

5. The angle valve with anti-backflow structure according to claim 4, characterized in that: The water stop column (16) is composed of a main column (21) and a secondary column (22), the main column (21) is screwed to the valve shaft (14), the anti-backflow column (18) is sleeved and slides on the outer surface of the secondary column (22), the bottom of the main column (21) is provided with a built-in groove (23), the secondary column (22) is arranged in the built-in groove (23) and extends out of the built-in groove (23), and the spring (20) is arranged outside the anti-backflow column (18) and extends into the built-in groove (23) to abut against the inner wall of the built-in groove (23).

6. The angle valve with anti-backflow structure according to claim 5, characterized in that: A shape-limiting groove (24) is provided at one end of the anti-backflow column (18) close to the water inlet (12), and a sealing gasket (19) is arranged in the shape-limiting groove (24) and extends out of the shape-limiting groove (24).

7. The angle valve with anti-backflow structure according to claim 6, characterized in that: A limiting shaft (25) is provided in the limiting groove (24), the sealing gasket (19) is sleeved outside the limiting shaft (25) and the limiting shaft (25) passes through the sealing gasket (19), the limiting shaft (25) is provided with a raised clamping surface (26), and the upper and lower outer surfaces of the sealing gasket (19) respectively abut against the inner wall of the limiting groove (24) and the clamping surface (26).

8. The angle valve with anti-backflow structure according to claim 1, characterized in that: The outer surface of the valve housing (10) at the water inlet (12) and the water outlet (13) is threaded.

9. The angle valve with anti-backflow structure according to claim 1, characterized in that: The hand wheel (15) is provided with an inner ring (27), which extends into the valve housing (10) and is rotatably connected thereto. The outer surface of the valve housing (10) is provided with an outer ring (28), which extends into the hand wheel (15) and is rotatably connected thereto.

10. The angle valve with anti-backflow structure according to claim 1, characterized in that: The outer surface of the hand wheel (15) is provided with a recessed hand grip area (29).

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