Flow-limiting check valve

Abstract

The utility model provides a flow-limiting check valve which comprises a valve body with a valve cavity and an elastic backflow-preventing sealing piece arranged in the valve cavity, the edge of the elastic backflow-preventing sealing piece abuts against the cavity wall of the valve cavity, an upper flow-limiting hole and a lower flow-limiting hole which are communicated in sequence are formed in the end face of the valve body, and the flow-limiting area of the lower flow-limiting hole is smaller than that of the upper flow-limiting hole. A rear cover which abuts against and fixes the non-return face of the backflow prevention sealing piece is fixedly arranged in the valve cavity. According to the flow-limiting check valve, the rear cover is arranged below the anti-backflow sealing piece, the water pressure resistance of the anti-backflow sealing piece can be improved, a water path using the flow-limiting check valve is not prone to non-return failure, stability is good, and the flow-limiting check valve can be applied to high-water-pressure use scenes and is good in practicability.

Description

Technical Field

[0001] This utility model relates to the technical field of check valves, and in particular to a flow-limiting check valve. Background Technology

[0002] A check valve is a valve that prevents the backflow of a medium. It allows the medium to flow in only one direction, preventing it from flowing in the opposite direction. Under the pressure of fluid flowing in one direction, the check valve opens; when the fluid flows in the opposite direction, the check valve closes, thus preventing backflow.

[0003] Chinese Patent Application Publication No. CN101858448A discloses a water-saving check valve, comprising a valve body, an elastic check element, and an elastic water-saving plate. The valve body has a water passage, a fixed seat located within the water passage, and spokes that fix the fixed seat within the water passage, forming a flow path. The elastic check element has an elastic check plate adaptable to the water passage and a fixed head located at the center of the front of the elastic check plate and fixed to the fixed seat. When the water flows in the forward direction, the elastic check plate deforms under the impact of the forward flow to open the flow path; when the water flows backward, the elastic check plate resets under the impact of the backward flow to seal the flow path. The elastic water-saving plate is sealed and installed within the water passage of the valve body. A water passage hole is formed through the elastic water-saving plate, and a boss is provided on the top surface of the elastic water-saving plate through which the water passage hole passes. The boss on the elastic water-saving plate deforms under the water pressure of the water flow to change the cross-sectional area of ​​the water passage hole.

[0004] When the water flows in the forward direction, the water pressure acts on the boss of the elastic water-saving plate, causing the boss to deform. This reduces the water passage area of ​​the water passage and decreases the flow rate. The water flowing in the forward direction passes through the water passage of the elastic water-saving plate and enters the water circuit. The elastic check valve deforms and is in the open state. When the water flows in the reverse direction, the water pressure acts on the back of the check valve, causing the check valve to come into close contact with the spokes, thereby sealing the passage and achieving the check valve state.

[0005] The existing technical solution described above has the following defects: Although the water-saving check valve has the functions of saving water and preventing backflow, the elastic check plate is only fixed to the fixed seat through the fixed head. The elastic fixed head is fixed to the fixed seat by a snap-fit ​​method. When the water pressure is greater than the connection strength between the fixed head and the fixed seat, the fixed head of the elastic check plate will separate from the fixed seat under the impact of the water flow. At this time, the water-saving check valve loses its backflow prevention function. The water-saving check valve has the defect of poor water pressure resistance, which leads to the backflow prevention failure of the water circuit. Utility Model Content

[0006] The problem this utility model aims to solve is to provide a flow-limiting check valve that addresses the aforementioned shortcomings in the prior art, thereby solving the problem of poor water pressure resistance in the prior art.

[0007] The above-mentioned utility model objective is achieved through the following technical solution: a flow-limiting check valve, comprising a valve body having a valve cavity, an elastic anti-backflow sealing element disposed in the valve cavity and whose edge abuts against the valve cavity wall, wherein an upper flow-limiting hole and a lower flow-limiting hole with a flow area smaller than the upper flow-limiting hole and communicating with the valve cavity are sequentially connected on the end face of the valve body, and a rear cover that abuts against and fixes the anti-backflow sealing element check surface is fixedly disposed in the valve cavity.

[0008] The present invention is further configured such that: a lower insertion post is provided on the check surface of the anti-backflow seal, and the rear cover includes a protective body fixedly disposed in the valve cavity and a lower slot opened on the top surface of the protective body and inserted into the lower insertion post.

[0009] The present invention is further configured such that: the outer wall of the protective body has a conical surface that abuts against the check surface of the anti-backflow seal.

[0010] The present invention is further configured such that: an insert groove communicating with the valve cavity is provided on the bottom wall of the valve body, and a snap hole communicating with the insert groove is provided on the outer wall of the valve body; the rear cover also includes a side ring disposed on the outside of the protective body and engaged with the insert groove, a connecting strip disposed between the protective body and the side ring, and a buckle disposed on the outer wall of the side ring and engaged with the snap hole.

[0011] The present invention is further configured such that: a positioning groove communicating with the embedded ring groove is provided on the bottom wall of the valve body, and a positioning block that is inserted into the positioning groove is provided on the outer side wall of the side ring.

[0012] The present invention is further configured such that: the upper flow limit hole has a protruding tooth extending into the lower flow limit hole on its hole wall.

[0013] The present invention is further configured such that: a collar post is provided on the bottom wall of the upper flow limit hole, and a flow limiting ring for blocking part of the lower flow limit hole is sleeved on the collar post.

[0014] The present invention is further configured such that a limiting flange is provided on the cylindrical surface of the ring post.

[0015] The present invention is further configured such that: a sealing flange is provided on the outer side wall of the valve body, an inner sleeve gasket is wrapped on the sealing flange, and a flange groove for the sealing flange to be embedded is provided on the inner wall of the inner sleeve gasket.

[0016] In summary, the beneficial technical effects of this utility model are as follows:

[0017] (1) When the water-facing surface is impacted by water flow, the anti-backflow seal deforms inward, and a water passage gap is formed between the anti-backflow seal and the cavity wall of the valve cavity to allow water flow; when the check surface is impacted by water flow, the anti-backflow seal tends to deform outward, and the edge of the anti-backflow seal will fit more closely with the wall of the valve cavity, thus limiting the occurrence of water backflow.

[0018] (2) The water flows through the upper limit flow hole and the lower limit flow hole in sequence. Since the cross-sectional area of ​​the lower limit flow hole is smaller than that of the upper limit flow hole, when the water flows from the upper limit flow hole (which is a large hole) into the lower limit flow hole (which is a small hole), the flow area is reduced and the resistance is increased, thus forming a local pressure drop and achieving the effect of flow restriction, and the flow rate is reduced accordingly.

[0019] (3) The water flows through the upper flow limit orifice and the lower flow limit orifice in sequence. During this process, the water will flow through the protruding teeth. The protruding teeth will increase the local resistance of the flow channel, thereby achieving the effect of flow restriction. This flow restriction check valve improves the flow restriction effect by setting protruding teeth.

[0020] (4) When the water pressure increases, the flow-limiting ring is deformed under pressure, which leads to an increase in the outer diameter of the flow-limiting ring. At the same time, the flow-limiting ring partially blocks the eight lower flow-limiting holes, so the flow area of ​​the eight lower flow-limiting holes becomes smaller, the resistance increases, and a pressure drop is formed locally, thereby achieving the purpose of improving the flow-limiting effect. When the water pressure decreases, the elastic flow-limiting ring will reset, so the outer diameter of the flow-limiting ring becomes smaller, the flow area of ​​the eight lower flow-limiting holes becomes larger, the resistance decreases, thereby achieving the purpose of reducing the flow-limiting effect. This flow-limiting check valve achieves the purpose of dynamic flow-limiting by setting the flow-limiting ring.

[0021] (5) The top of the outer wall of the protective body is a conical surface that can abut against the check surface of the anti-backflow seal. When the water-facing surface is impacted by the water flow, the anti-backflow seal deforms inward until the check surface of the anti-backflow seal abuts against the conical surface of the protective body. At this time, the anti-backflow seal is difficult to continue to deform inward, which can prevent the anti-backflow seal from being damaged due to excessive deformation. At the same time, designing the top of the outer wall of the protective body as a conical surface can reduce water flow noise by reducing the impact force of the water flow.

[0022] (6) This flow-limiting check valve has a rear cover below the anti-backflow seal, which helps to improve the water pressure resistance of the anti-backflow seal. Water circuits using this flow-limiting check valve are less likely to fail to check back, and have good stability. This flow-limiting check valve can be applied to high water pressure application scenarios and has good practicality. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the flow-limiting check valve in this utility model;

[0024] Figure 2 This is an exploded structural diagram of the flow-limiting check valve in this utility model;

[0025] Figure 3 This is a first-view structural schematic diagram of the valve body in this utility model;

[0026] Figure 4 This is a cross-sectional view of the flow-limiting check valve in this utility model;

[0027] Figure 5 This is a structural schematic diagram of the valve body from a second perspective in this utility model.

[0028] In the above attached figures: 1. Valve body; 2. Upper limit flow orifice; 3. Lower limit flow orifice; 4. Valve cavity; 5. Raised tooth; 6. Collar post; 7. Flow limiting ring; 8. Limiting flange; 9. Sealing flange; 10. Inner sleeve gasket; 11. Flanged groove; 12. Upper slot; 13. Upper insert post; 14. Anti-backflow seal; 141. Water-facing surface; 142. Check valve surface; 15. Rear cover; 151. Protective body; 152. Connecting strip; 153. Side ring; 16. Lower insert post; 17. Lower slot; 18. Conical surface; 19. Embedded ring groove; 20. Snap hole; 21. Snap fastener; 22. Positioning groove; 23. Positioning block. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this utility model clearer and easier to understand, the present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] like Figure 1 and 2 As shown, this utility model proposes a flow-limiting check valve, including an inner gasket 10, a flow-limiting ring 7, a valve body 1, an anti-backflow seal 14, and a rear cover 15.

[0031] like Figure 3 and 4 As shown, in this embodiment, the valve body 1 is cylindrical, and an upper limit flow hole 2, a lower limit flow hole 3, and a valve cavity 4 are sequentially connected on the end face of the valve body 1. The cross-section of the upper limit flow hole 2 is circular, and there are eight lower limit flow holes 3. The eight lower limit flow holes 3 are distributed equidistantly around the central axis of the upper limit flow hole 2. The cross-section of the lower limit flow hole 3 is fan-shaped, and the cross-sectional area of ​​the lower limit flow hole 3 is smaller than that of the upper limit flow hole 2. The flow area of ​​the lower limit flow hole 3 is smaller than that of the upper limit flow hole 2.

[0032] In this embodiment, when the flow-limiting check valve is working: the water flows through the upper flow-limiting orifice 2 and the lower flow-limiting orifice 3 in sequence. Since the cross-sectional area of ​​the lower flow-limiting orifice 3 is smaller than that of the upper flow-limiting orifice 2, when the water flows from the upper flow-limiting orifice 2 (which is a large orifice) into the lower flow-limiting orifice 3 (which is a small orifice), the flow area is reduced and the resistance is increased, thereby forming a local pressure drop, achieving the effect of flow restriction, and the flow rate is reduced accordingly.

[0033] like Figure 3 As shown, in this embodiment, the upper flow hole 2 is fixedly connected with protruding teeth 5, and there are sixteen protruding teeth 5, of which the lower part of eight protruding teeth 5 extends into the lower flow hole 3.

[0034] In this embodiment, when the flow-limiting check valve is working, the water flows through the upper flow-limiting hole 2 and the lower flow-limiting hole 3 in sequence. During this process, the water flows through the protruding teeth 5. The protruding teeth 5 increase the local resistance of the flow channel, thereby achieving the effect of flow restriction. This flow-limiting check valve improves the flow restriction effect by setting the protruding teeth 5.

[0035] like Figure 2 and 4 As shown, a cylindrical collar post 6 is integrally connected to the center of the bottom wall of the upper flow orifice 2, and a circular groove is opened on the top surface of the collar post 6. The flow limiting ring 7 is sleeved on the collar post 6. The flow limiting ring 7 is an O-ring made of elastic material (such as rubber, elastic plastic, etc.). The flow limiting ring 7 abuts against the bottom wall of the upper flow orifice 2, and the flow limiting ring 7 also partially blocks the eight lower flow limiting orifices 3.

[0036] In this embodiment, when the flow-limiting check valve is working: when the water pressure increases, the flow-limiting ring 7 deforms under pressure, which in turn causes the outer diameter of the flow-limiting ring 7 to increase. At the same time, the flow-limiting ring 7 partially blocks the eight lower flow-limiting holes 3, thus reducing the flow area of ​​the eight lower flow-limiting holes 3.

[0037] The resistance will increase and a pressure drop will be formed locally, thereby improving the flow restriction effect. When the water pressure decreases, the elastic flow restriction ring 7 will reset, the outer diameter of the flow restriction ring 7 will decrease, the flow area of ​​the eight lower flow restriction holes 3 will increase, the resistance will decrease, thereby reducing the flow restriction effect. This flow restriction check valve achieves the purpose of dynamic flow restriction by setting the flow restriction ring 7.

[0038] like Figure 2 and 4 As shown, the top of the cylindrical surface of the collar post 6 is fixedly connected with an outwardly extending limiting flange 8. The limiting flange 8 is used to restrict the separation of the collar post 6 from the flow limiting ring 7, and to a certain extent avoids the flow limiting ring 7 from separating from the collar post 6 due to the impact of high-pressure water flow.

[0039] like Figure 2 and 4 As shown, a sealing flange 9 is integrally connected to the top of the outer wall of the valve body 1, and the cross-section of the sealing flange 9 is annular. An inner gasket 10 encloses the sealing flange 9. The inner gasket 10 is annular, and a flange groove 11 for the sealing flange 9 to be embedded is provided on the inner wall of the inner gasket 10.

[0040] In this embodiment, when the flow-limiting check valve is working: the worker or user inserts the valve body 1 into the water inlet at the bottom of the shower head until the inner sleeve gasket 10 abuts against the bottom surface of the shower head. Then, the hose that is threadedly connected to the bottom of the shower head through the connector is installed. The inner sleeve gasket 10 with a double-sided sealing structure forms a seal between the shower head and the hose, and no additional sealing gasket is required between the shower head and the hose.

[0041] like Figure 2 and 4 As shown, the valve cavity 4 has a circular cross-section, and an upper slot 12 is provided at the center of the top wall of the valve cavity 4. The upper slot 12 is a circular groove, and the top of the upper slot 12 extends into the collar post 6. An upper insertion post 13 is integrally connected to the top wall of the anti-backflow seal 14. The upper insertion post 13 is cylindrical and is inserted into the upper slot 12.

[0042] like Figure 2 and 4 As shown, the anti-backflow seal 14 is bowl-shaped and made of an elastic material. In this embodiment, the anti-backflow seal 14 is made of rubber. Initially, the edge of the anti-backflow seal 14 is in contact with the wall of the valve cavity 4. The anti-backflow seal 14 has a water-facing surface 141 facing the lower flow-limiting hole 3 and a check surface 142 facing away from the lower flow-limiting hole 3. When the water-facing surface 141 is impacted by water flow, the anti-backflow seal 14 deforms inward, forming a water-passing gap between the anti-backflow seal 14 and the wall of the valve cavity 4. When the check surface 142 is impacted by water flow, the anti-backflow seal tends to deform outward, causing the edge of the anti-backflow seal to fit more closely with the wall of the valve cavity 4, thus preventing backflow.

[0043] like Figure 2 and 4 As shown, the rear cover 15 is located on the side of the anti-backflow seal 14 away from the lower flow limit hole 3. The rear cover 15 includes a protective body 151, a connecting strip 152, and a side ring 153.

[0044] like Figure 2 and 4 As shown, a lower insert post 16 is integrally connected to the bottom wall of the anti-backflow seal 14. The lower insert post 16 is cylindrical. The protective body 151 is located at the center of the valve cavity 4. A lower slot 17 is provided on the top surface of the protective body 151. The lower slot 17 is a circular groove and is inserted into the lower insert post 16.

[0045] like Figure 2 and 4As shown, the top of the outer wall of the protective body 151 is a conical surface 18 that can abut against the check surface 142 of the anti-backflow seal 14. When the water-facing surface 141 is impacted by water flow, the anti-backflow seal 14 deforms inward until the check surface 142 of the anti-backflow seal 14 abuts against the conical surface 18 of the protective body 151. At this time, the anti-backflow seal 14 is difficult to continue to deform inward, thus preventing the anti-backflow seal 14 from being damaged due to excessive deformation. At the same time, designing the top of the outer wall of the protective body 151 as a conical surface 18 can reduce water flow noise by reducing the impact force of water flow.

[0046] like Figure 2 and 4 As shown, in this embodiment, there are four connecting strips 152. The four connecting strips 152 are distributed equidistantly in a circle with the central axis of the protective body 151 as the center. One end of the connecting strip 152 is connected to the outer wall of the protective body 151, and the other end is connected to the inner wall of the edge ring 153. The gap between the four connecting strips 152 forms a flow channel for water to flow through.

[0047] like Figure 2 and 5 As shown, a ring groove 19 is provided on the bottom wall of the valve body 1. The cross-section of the ring groove 19 is circular, and the ring groove 19 communicates with the valve cavity 4. Four locking holes 20 are provided at equal intervals around the outer side wall of the valve body 1, and all four locking holes 20 communicate with the ring groove 19.

[0048] like Figure 2 and 5 As shown, the side ring 153 is circular and engages with the ring groove 19. When the side ring 153 is embedded in the ring groove 19, the top surface of the side ring 153 abuts against the top wall of the ring groove 19, with part of the side ring 153 located in the ring groove 19 and the other part located in the valve cavity 4. Four clips 21 are fixedly connected to the outer wall of the side ring 153. The top surface of the clips 21 is an inclined surface that slopes away from the side ring 153. The four clips 21 are equidistantly distributed in a circle, and each clip engages with the other clip, thereby securing the back cover 15.

[0049] like Figure 2 and 5 As shown, in this embodiment, four positioning grooves 22 are provided on the bottom wall of the valve body 1. The positioning grooves 22 are rectangular grooves, and all four positioning grooves 22 are connected to the embedded ring groove 19. The four positioning grooves 22 are distributed equidistantly around the central axis of the valve body 1. Four positioning blocks 23 are fixedly connected to the outer wall of the side ring 153, and the positioning blocks 23 are inserted into the positioning grooves 22.

[0050] This flow-limiting check valve has a rear cover 15 below the anti-backflow seal 14, which helps to improve the water pressure resistance of the anti-backflow seal 14. Water circuits using this flow-limiting check valve are less prone to backflow failure, have good stability, and can be applied to high water pressure scenarios, making it highly practical.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A flow-limiting check valve, comprising a valve body (1) having a valve cavity (4), and an elastic anti-backflow sealing member (14) disposed within the valve cavity (4) and having its edge abutting against the wall of the valve cavity (4), characterized in that: The valve body (1) has an upper limit flow hole (2) connected in sequence on its end face, and a lower limit flow hole (3) with a flow area smaller than the upper limit flow hole (2) and connected to the valve cavity (4). The valve cavity (4) is fixedly provided with a rear cover (15) that abuts against the check surface (142) of the anti-backflow seal (14).

2. The flow-limiting check valve according to claim 1, characterized in that: The anti-backflow seal (14) has a lower insertion post (16) on its check surface (142). The rear cover (15) includes a protective body (151) fixedly disposed in the valve cavity (4) and a lower slot (17) opened on the top surface of the protective body (151) and inserted into the lower insertion post (16).

3. A flow-limiting check valve according to claim 2, characterized in that: The outer wall of the protective body (151) has a conical surface (18) that abuts against the check surface (142) of the anti-backflow seal (14).

4. A flow-limiting check valve according to claim 2 or 3, characterized in that: The bottom wall of the valve body (1) is provided with an inserting groove (19) that communicates with the valve cavity (4). The outer wall of the valve body (1) is provided with a locking hole (20) that communicates with the inserting groove (19). The rear cover (15) also includes a side ring (153) disposed on the outside of the protective body (151) and fitted into the inserting groove (19), a connecting strip (152) disposed between the protective body (151) and the side ring (153), and a buckle (21) disposed on the outer wall of the side ring (153) and fitted into the locking hole (20).

5. A flow-limiting check valve according to claim 4, characterized in that: The bottom wall of the valve body (1) is provided with a positioning groove (22) that communicates with the embedded ring groove (19), and the outer side wall of the side ring (153) is provided with a positioning block (23) that is inserted into the positioning groove (22).

6. A flow-limiting check valve according to claim 1, characterized in that: The upper flow hole (2) has protruding teeth (5) extending into the lower flow hole (3) on its hole wall.

7. A flow-limiting check valve according to claim 1 or 6, characterized in that: A collar post (6) is provided on the bottom wall of the upper flow limit hole (2), and a flow limiting ring (7) for blocking part of the lower flow limit hole (3) is sleeved on the collar post (6).

8. A flow-limiting check valve according to claim 7, characterized in that: The collar post (6) is provided with a limiting flange (8) on its cylindrical surface.

9. A flow-limiting check valve according to claim 1, characterized in that: A sealing flange (9) is provided on the outer side wall of the valve body (1), and an inner gasket (10) is wrapped around the sealing flange (9). A flange groove (11) for the sealing flange (9) to be embedded is provided on the inner wall of the inner gasket (10).

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