A backflow prevention stop valve and terminal water equipment

Abstract

The utility model discloses a kind of anti-reflux stop valve and terminal water equipment, stop valve body includes the first shell, support and second shell connected in sequence, first chamber is equipped between the first shell and support, second chamber is equipped between the second shell and support, first sealing pad is equipped in first chamber, second sealing pad is equipped in second chamber;The inner wall of first chamber and the inner wall of second chamber are all equipped with overflow structure along the downstream direction of fluid pipeline, the inner wall of first chamber and the inner wall of second chamber are all equipped with stop end face along the reverse flow direction of fluid pipeline;When at least one sealing pad in first sealing pad and second sealing pad is attached on stop end face, fluid pipeline is in stop state.The utility model can meet the requirement of anti-reflux test standard, simplifies the waterway layout inside water equipment, so that equipment structure is more compact, more easily designed and assembled, simultaneously further reduce production cost, also convenient for later maintenance and overhaul.

Description

Technical Field

[0001] This utility model relates to a device that is connected to a public water source and has an anti-backflow structure in accordance with regulations, specifically an anti-backflow shut-off valve and a terminal water supply device. Background Technology

[0002] Products connected to public water sources must have anti-backflow functionality. Current applications typically require this functionality, necessitating both a one-way valve / duckbill valve and a vacuum breaker to meet the anti-backflow test standard of -85 kPa after a single failure. However, incorporating both components complicates the internal water system and increases the production cost of the hardware itself.

[0003] In view of this, there is an urgent need to design a device with a simple structure that can meet the backflow prevention test standards in order to solve the technical pain points currently faced by the aforementioned water-using equipment. Summary of the Invention

[0004] To solve the above problems, this utility model provides an anti-backflow shut-off valve and a terminal water supply device.

[0005] In a first aspect, this utility model provides a backflow prevention shut-off valve, comprising a shut-off valve body, wherein a fluid pipeline is provided within the shut-off valve body, the shut-off valve body comprising a first housing, a support, and a second housing connected in sequence, a first chamber being provided between the first housing and the support, and a second chamber being provided between the second housing and the support, a first sealing gasket being provided in the first chamber, and a second sealing gasket being provided in the second chamber; the inner walls of the first chamber and the second chamber are each provided with a flow-through structure along the flow direction of the fluid pipeline, and the inner walls of the first chamber and the second chamber are each provided with a shut-off end face along the flow direction of the fluid pipeline; when at least one of the first sealing gasket and the second sealing gasket is attached to the shut-off end face, the fluid pipeline is in a shut-off state.

[0006] In one possible implementation, the first housing has a water inlet channel, the second housing has a water outlet channel, and the bracket has a connecting channel. The water inlet channel, the first chamber, the connecting channel, the second chamber, and the water outlet channel constitute the fluid pipeline.

[0007] In one possible implementation, the support protrudes towards the first chamber from the side near the first housing to form a plurality of first flow passages, and a first flow passage gap is formed between the first flow passages. The plurality of first flow passages constitute the flow passage structure of the first chamber.

[0008] In one possible implementation, the second housing protrudes towards the second chamber from the side near the support to form a plurality of second flow passages, and a second flow passage gap is formed between the second flow passages. The plurality of second flow passages constitute the flow passage structure of the second chamber.

[0009] In one possible implementation, the cut-off end face of the first chamber is located on the outer periphery of the water inlet channel, and the cut-off end face of the second chamber is located on the outer periphery of the connecting channel.

[0010] In one possible implementation, the first housing has a water inlet connector at the end away from the support, and the second housing has a water outlet connector at the end away from the support.

[0011] In one possible implementation, neither the first sealing gasket nor the second sealing gasket has a through structure, the size of the first sealing gasket is smaller than the size of the first chamber, and the size of the second sealing gasket is smaller than the size of the second chamber.

[0012] In one possible implementation, the cut-off end face is adapted to the first sealing gasket and the second sealing gasket.

[0013] In one possible implementation, the first housing, the second housing, and the bracket all include a joint edge, and the joint edge of the bracket is connected to the joint edge of the first housing and the joint edge of the second housing respectively by welding or bonding.

[0014] In a second aspect, a terminal water supply device is provided, including the aforementioned anti-backflow shut-off valve.

[0015] The working principle of this anti-backflow shut-off valve is as follows: When the water supply is in a forward flow state, the water flows in the fluid pipeline, pushing the first sealing gasket to move or deform towards the flow structure of the first chamber and pushing the second sealing gasket to move or deform towards the flow structure of the second chamber, so that the first and second sealing gaskets are respectively away from the shut-off end faces of the first and second chambers. At this time, the water flow can smoothly pass through the flow structures of the first and second chambers, and the shut-off valve is in a fully open state. When the water supply is in a reverse flow state, the water flow pushes the first sealing gasket and / or the second sealing gasket to move or deform towards the shut-off end face of the corresponding chamber, so that the first sealing gasket and / or the second sealing gasket are tightly fitted with the shut-off end face of the corresponding chamber, thereby performing a reverse flow shut-off function on the fluid pipeline and preventing the water from flowing upstream.

[0016] Compared with the prior art, the technical solution provided by this utility model has the following advantages: This technical solution's anti-backflow shut-off valve uses two series-connected and independent sealing shut-off units to form a reliable anti-backflow design structure. Even if one sealing shut-off unit fails completely for any reason, the other sealing shut-off unit can still provide anti-backflow protection. At the same time, when negative pressure is generated in the upstream pipeline of the shut-off valve body (such as when the water supply suddenly stops), its pressure is lower than the atmospheric pressure downstream, and reverse pressure will be formed between the upstream and downstream, thus causing backflow. The individual movable structure of these two sealing gaskets can quickly respond to changes in water pressure and quickly and reliably prevent water from flowing back, eliminating the need for a vacuum breaker.

[0017] The structure of this utility model anti-backflow shut-off valve meets the requirements of the anti-backflow test standard, significantly simplifies the water circuit layout inside the water-using equipment, makes the equipment structure more compact, easier to design and assemble, reduces product installation procedures, further reduces production costs, and facilitates later maintenance and repair. Attached Figure Description

[0018] Figure 1 This is a front view of the anti-backflow shut-off valve according to an embodiment of this utility model.

[0019] Figure 2 This is an exploded view of the anti-backflow shut-off valve according to an embodiment of this utility model.

[0020] Figure 3 This is a front view of the first housing in an embodiment of the present utility model.

[0021] Figure 4 This is a top view of the first housing of this utility model embodiment.

[0022] Figure 5 This is a front view of the bracket according to an embodiment of the present utility model.

[0023] Figure 6 This is a top view of the bracket according to an embodiment of the present utility model.

[0024] Figure 7 This is a bottom view of the bracket according to an embodiment of the present utility model.

[0025] Figure 8 This is a perspective view of the second housing in an embodiment of the present utility model.

[0026] Figure 9 This is a schematic diagram of the anti-backflow shut-off valve in the current water supply state according to an embodiment of the present utility model.

[0027] Figure 10 This is a schematic diagram of the anti-backflow shut-off valve in an embodiment of the present invention when the water supply is in a backflow state.

[0028] Appendix Figure 11 This is a cross-sectional view of the first housing according to another embodiment of the present invention.

[0029] Appendix Figure 12 This is a cross-sectional view of a sealing gasket according to another embodiment of the present invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. The accompanying drawings are for illustrative purposes only, representing schematic diagrams only, not actual object drawings, and should not be construed as limiting this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0031] Example 1

[0032] Combined with appendix Figure 1 To be continued Figure 10 This utility model provides a backflow prevention shut-off valve, comprising a shut-off valve body with a fluid pipeline inside. The shut-off valve body includes a first housing 100, a support 300, and a second housing 500 connected in sequence. A first chamber 600 is provided between the first housing 100 and the support 300, and a second chamber 700 is provided between the second housing 500 and the support 300. A first sealing gasket 200 is provided in the first chamber 600, and a second sealing gasket 400 is provided in the second chamber 700. The inner walls of the first chamber 600 and the second chamber 700 are provided with flow passage structures along the flow direction of the fluid pipeline, and the inner walls of the first chamber 600 and the second chamber 700 are provided with shut-off end faces along the flow direction of the fluid pipeline. When at least one of the first sealing gasket 200 and the second sealing gasket 400 is attached to the shut-off end face, the fluid pipeline is in a shut-off state.

[0033] In this embodiment, both the first sealing gasket 200 and the second sealing gasket 400 are complete sheet structures. The range of motion of the first sealing gasket 200 within the first chamber 600 includes movement along the axial direction of the fluid pipeline and movement along the radial direction of the first chamber 600. The range of motion of the second sealing gasket 400 within the second chamber 700 includes movement along the axial direction of the fluid pipeline and movement along the radial direction of the second chamber 700, to ensure that the fluid pipeline remains unobstructed after the first sealing gasket 200 and the second sealing gasket 400 leave the cut-off end face.

[0034] In this embodiment, the downstream direction of the fluid pipeline is adjacent to the upstream direction. Figure 9 The arrow in the image indicates that the counter-current direction of the fluid pipeline is as shown in the image. Figure 10 The direction of the arrow in the image.

[0035] In this embodiment, the flow-through structure and the stop end face are arranged opposite each other in the same chamber. The flow-through structure is used for water to flow through, and the stop end face is used to cooperate with the sealing gasket to achieve the stop of water flow.

[0036] In this embodiment, the working principle of the anti-backflow shut-off valve of this utility model is as follows: the first and second housings of the anti-backflow shut-off valve are respectively connected to the water circuit. When the water supply is in a forward flow state, the water flows in the fluid pipeline, pushing the first sealing gasket 200 to move or deform towards the flow structure of the first chamber 600 and pushing the second sealing gasket 400 to move or deform towards the flow structure of the second chamber 700, so that the first sealing gasket 200 and the second sealing gasket 400 are respectively away from the shut-off end faces of the first chamber 600 and the second chamber 700. At this time, the water flow can smoothly pass through the flow structure of the first chamber 600 and the second chamber 700, and the shut-off valve is in a fully open state. When the water supply is in a reverse flow state, the water flow pushes the first sealing gasket 200 and / or the second sealing gasket 400 to move or deform towards the shut-off end face of the corresponding chamber, so that the first sealing gasket 200 and / or the second sealing gasket 400 are tightly fitted with the shut-off end face of the corresponding chamber, thereby performing a reverse flow shut-off function on the fluid pipeline and preventing the water from flowing upstream.

[0037] In this embodiment, it should be noted that: when the water flows with or against the current, the first sealing gasket 200 and the second sealing gasket 400 can move within their respective chambers, or the sealing gaskets can deform to achieve the fit between the sealing gaskets and the cut-off end face.

[0038] In this embodiment, as shown in the appendix Figure 9 and attached Figure 10As shown, the first housing 100 has a water inlet channel 110, the second housing 500 has a water outlet channel 510, and the bracket 300 has a connecting channel 310. The water inlet channel 110, the first chamber 600, the connecting channel 310, the second chamber 700, and the water outlet channel 510 constitute the fluid pipeline.

[0039] In this embodiment, the water inlet channel 110, the connecting channel 310, and the water outlet channel 510 are arranged coaxially.

[0040] In this embodiment, as shown in the appendix Figure 5 To be continued Figure 7 As shown, the bracket 300 protrudes towards the first chamber 600 from the side near the first housing 100 to form a plurality of first flow passages 320. The first flow passages 320 are distributed in a ring around the connecting channel 310, and a first flow passage gap 330 is formed between the first flow passages 320. The plurality of first flow passages 320 constitute the flow passage structure of the first chamber 600.

[0041] In this embodiment, as shown in the appendix Figure 8 As shown, the second housing 500 protrudes towards the second chamber 700 on the side near the support 300 to form a plurality of second flow passages 520. The second flow passages 520 are distributed in a ring around the water outlet channel 510. A second flow passage gap 530 is formed between the second flow passages 520. The plurality of second flow passages 520 constitute the flow passage structure of the second chamber 700.

[0042] In this embodiment, as shown in the appendix Figure 9 and attached Figure 10 As shown, the first cut-off end face 120 of the first chamber 600 is located on the outer periphery of the water inlet channel 110, and the second cut-off end face 340 of the second chamber 700 is located on the outer periphery of the connecting channel 310.

[0043] In another embodiment, as shown in the appendix Figure 11 As shown, the first cut-off end face 120 of the first chamber 600 can be an inclined surface or an arc-shaped concave surface, and the second cut-off end face 340 of the second chamber 700 is similar, so it will not be described again.

[0044] In this embodiment, as shown in the appendix Figure 2 As shown, the first housing 100 is provided with a water inlet connector 130 at one end away from the bracket 300, and the second housing 500 is provided with a water outlet connector 550 at one end away from the bracket 300.

[0045] In this embodiment, as shown in the appendix Figure 9 and attached Figure 10As shown, neither the first sealing gasket 200 nor the second sealing gasket 400 has a through structure (i.e., both sealing gaskets are complete structures). The size of the first sealing gasket 200 is smaller than the size of the first chamber 600, and the size of the second sealing gasket 400 is smaller than the size of the second chamber 700.

[0046] In this embodiment, as shown in the appendix Figure 9 and attached Figure 10 As shown, the first sealing gasket 200 and the second sealing gasket 400 have a flat surface on the side near the cut-off end face, and the cut-off end face is distributed to match the first sealing gasket 200 and the second sealing gasket 400. Figure 9 and attached Figure 10 The embodiment shown only depicts a flat surface. In another embodiment, the side of the first sealing gasket 200 and the second sealing gasket 400 near the cut-off end face can also be a conical, frustum-shaped, or spherical structure, for example, with... Figure 12 As shown, the first sealing gasket 200 and the second sealing gasket 400 can be in the form of an umbrella-shaped structure (similar to a frustum-shaped structure).

[0047] In this embodiment, as shown in the appendix Figure 3 To be continued Figure 8 As shown, the first housing 100 includes a first joint edge 140, the second housing 500 includes a second joint edge 540, and the bracket 300 includes a bracket joint edge 350. The bracket joint edge 350 is connected to the first joint edge 140 and the second joint edge 540 respectively by welding or bonding.

[0048] This embodiment of the backflow prevention shut-off valve uses two series-connected and independent sealing shut-off units to form a reliable backflow prevention design structure. Even if one sealing shut-off unit fails completely for any reason, the other sealing shut-off unit can still provide backflow prevention protection. Simultaneously, when negative pressure occurs in the upstream pipeline of the shut-off valve body (such as a sudden stop in water supply), its pressure is lower than the atmospheric pressure downstream, creating reverse pressure between upstream and downstream, thus causing backflow. The individual movable structure of these two sealing gaskets can quickly respond to changes in water pressure, rapidly and reliably preventing backflow, eliminating the need for a vacuum breaker. The structure of this embodiment of the backflow prevention shut-off valve meets the requirements of backflow prevention test standards, significantly simplifies the internal water circuit layout of water-using equipment, making the equipment structure more compact, easier to design and assemble, reducing product installation steps, further lowering production costs, and facilitating later maintenance and repair.

[0049] Example 2

[0050] Combined with appendix Figure 1 To be continued Figure 10The present invention is a terminal water supply device, including the anti-backflow shut-off valve described in Example 1.

[0051] In this embodiment, the terminal water-using equipment can be a smart toilet, dishwasher, washing machine, water purifier, robot vacuum cleaner, water heater, etc.

[0052] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model, or direct / indirect applications in other related technical fields, should be included within the scope of protection of the claims of this utility model.

Claims

1. A backflow prevention shut-off valve, comprising a shut-off valve body, wherein a fluid pipeline is provided within the shut-off valve body, characterized in that, The shut-off valve body includes a first housing, a bracket, and a second housing connected in sequence. A first chamber is provided between the first housing and the bracket, and a second chamber is provided between the second housing and the bracket. A first sealing gasket is provided in the first chamber, and a second sealing gasket is provided in the second chamber. The inner walls of the first chamber and the second chamber are provided with flow-through structures along the flow direction of the fluid pipeline, and the inner walls of the first chamber and the second chamber are provided with shut-off end faces along the flow direction of the fluid pipeline. When at least one of the first sealing gasket and the second sealing gasket is attached to the shut-off end face, the fluid pipeline is in a shut-off state.

2. The anti-backflow shut-off valve according to claim 1, characterized in that, The first housing has a water inlet channel, the second housing has a water outlet channel, and the bracket has a connecting channel. The water inlet channel, the first chamber, the connecting channel, the second chamber, and the water outlet channel constitute the fluid pipeline.

3. The anti-backflow shut-off valve according to claim 2, characterized in that, The bracket protrudes from the side near the first housing toward the first chamber to form a plurality of first flow passages, and a first flow passage gap is formed between the first flow passages. The plurality of first flow passages constitute the flow passage structure of the first chamber.

4. The anti-backflow shut-off valve according to claim 2, characterized in that, The second housing protrudes towards the second chamber from the side near the bracket to form a plurality of second flow passages, and a second flow passage gap is formed between the second flow passages. The plurality of second flow passages constitute the flow passage structure of the second chamber.

5. A backflow prevention shut-off valve according to claim 2, characterized in that, The cut-off end face of the first chamber is located on the outer periphery of the water inlet channel, and the cut-off end face of the second chamber is located on the outer periphery of the connecting channel.

6. A backflow prevention shut-off valve according to any one of claims 1 to 5, characterized in that, The first housing has a water inlet connector at the end away from the bracket, and the second housing has a water outlet connector at the end away from the bracket.

7. A backflow prevention shut-off valve according to any one of claims 1 to 5, characterized in that, Neither the first sealing gasket nor the second sealing gasket has a through structure. The size of the first sealing gasket is smaller than the size of the first chamber, and the size of the second sealing gasket is smaller than the size of the second chamber.

8. A backflow prevention shut-off valve according to any one of claims 1 to 5, characterized in that, The cut-off end face is adapted to the first sealing gasket and the second sealing gasket.

9. A backflow prevention shut-off valve according to any one of claims 1 to 5, characterized in that, The first housing, the second housing, and the bracket all include a joint edge, and the joint edge of the bracket is connected to the joint edge of the first housing and the joint edge of the second housing respectively by welding or bonding.

10. A terminal water supply device, characterized in that, Includes the anti-backflow shut-off valve as described in any one of claims 1 to 9.

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