A pressure relief check device for a washing machine water inlet hose

Abstract

This utility model discloses a pressure-reducing and backflow prevention device for a washing machine's water inlet pipe, comprising a water inlet pipe body and a pressure-reducing and backflow prevention device body fixedly connected to its top. The pressure-reducing and backflow prevention device body includes: a water inlet connector, the bottom of which is fixedly connected to the top of the water inlet pipe body, with an internal thread on its inner top and an external thread connector fixedly connected to its top opening; and a cylinder, with an opening at its bottom and movably fitted inside the water inlet connector, with an arc-shaped water passage hole on the inner wall of the top of the cylinder. This utility model, through a series of structures, can utilize water pressure to elastically reduce and release water flow during water injection, and automatically rebound and seal to prevent backflow when water supply stops. This facilitates flexible adjustment of the elastic support force when the spring's elasticity weakens due to fatigue, ensuring continued stable use and preventing the phenomenon of weakened elasticity due to prolonged use leading to unstable operation, thus extending service life.

Description

Technical Field

[0001] This utility model relates to the technical field of washing machine components, specifically a pressure reducing and backflow prevention device for the water inlet pipe of a washing machine. Background Technology

[0002] Washing machine inlet hoses are usually directly connected to water pipes. Due to varying water pressures in different locations, excessively high water pressure can damage the inside of the washing machine. Additionally, when not in use, a straight inlet hose can easily allow leaked water from a damaged or improperly closed faucet to enter the washing machine, causing internal dampness and corrosion, and reducing its lifespan. This is especially problematic for elderly people who find it difficult to accept intelligent automation and opt for semi-automatic washing machines.

[0003] According to the new structure search report, announcement number CN203052049U discloses a pressure reducing and backflow prevention device for the water inlet pipe of a washing machine. This device is installed on the inlet end connector of the washing machine's water inlet pipe and includes a valve body, a positioning frame, a valve core, and a spring. The valve core has an umbrella-shaped structure. The addition of a pressure reducing and backflow prevention device inside the inlet end connector of the water inlet pipe can effectively buffer the impact of excessively high inlet water pressure on the washing machine, preventing damage. Simultaneously, when the faucet is damaged or not closed tightly, causing leaked water to flow in, the pressure reducing and backflow prevention device can promptly close and isolate the water inlet pipe, preventing water from flowing into the washing machine, ensuring the washing machine remains dry and hygienic when not in use, and extending the washing machine's service life.

[0004] The aforementioned technology discloses a pressure-reducing and backflow prevention device for a washing machine's inlet pipe. This device utilizes a valve body, positioning frame, valve core, and spring in conjunction with these components. During water injection, the water pressure drives the spring to contract and release, buffering and reducing water pressure. When the water pressure is too low, the spring automatically rebounds to prevent backflow. However, this device still has the following drawbacks: the spring's compression is fixed, and its supporting and sealing elasticity is not adjustable. With prolonged use, the elasticity weakens due to fatigue, making continued stable operation difficult and reducing its lifespan. Therefore, this application proposes a pressure-reducing and backflow prevention device for a washing machine's inlet pipe to address these problems. Utility Model Content

[0005] The purpose of this invention is to provide a pressure reducing and backflow prevention device for the water inlet pipe of a washing machine to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a pressure-reducing and backflow prevention device for a washing machine inlet pipe, comprising an inlet pipe body and a pressure-reducing and backflow prevention device body connected and fixed at its top end, wherein the pressure-reducing and backflow prevention device body comprises:

[0007] The water inlet connector is connected and fixed to the top of the water inlet pipe body at its bottom. It has an internal thread on its inner top and an external thread connector that is fixedly connected to the opening at its top.

[0008] A cylindrical tube with an open bottom, which is sealed and movably fitted inside the water inlet connector, and an arc-shaped water passage hole is provided on the inner wall of the top of the cylindrical tube;

[0009] The support plate is movably fitted inside the cylinder, and the top of the support plate has a plurality of first water passage holes in a ring shape;

[0010] The threaded adjustment assembly is threaded into the internal thread and fixedly connected to the top of the cylinder; the threaded adjustment assembly is used to move up and down through the internal thread during rotation to drive the cylinder to adjust its height.

[0011] The vertical guide support assembly is fixedly connected between the bottom of the support plate and the bottom of the cylinder, and makes movable contact with the bottom inner wall of the water inlet connector; the vertical guide support assembly is used to guide and support the support plate vertically.

[0012] The spring-loaded vertical guide pressure reducing and backstop assembly is installed on the support plate and makes active contact with the inner side of the arc-shaped water passage hole. The spring-loaded vertical guide pressure reducing and backstop assembly is used to elastically reduce water pressure under hydraulic pressure and to unseal the arc-shaped water passage hole for water passage. It is also used to automatically rebound and seal to prevent backflow when the water supply stops and the water pressure disappears. In addition, it is used to change the support elasticity when the cylinder moves downward.

[0013] Preferably, the threaded adjustment assembly includes an external threaded sleeve that is threaded into the internal thread, the bottom of the external threaded sleeve is fixedly connected to the top of the cylinder, and L-shaped levers are fixedly connected to the inner walls on both sides of the external threaded sleeve.

[0014] Preferably, the vertical guide support assembly includes two L-shaped guide rods that are in movable contact with the inner wall of the bottom of the water inlet connector. The bottom sides of the support plate are respectively fixedly connected to the top of the corresponding L-shaped guide rods. A ring is fixedly installed at the bottom of the cylinder by two screws, and the ring is slidably sleeved on the two L-shaped guide rods.

[0015] Preferably, the spring-loaded vertical guide pressure reducing and backstop assembly includes an arc-shaped plug that is movably sleeved inside an arc-shaped water passage hole. The top of the arc-shaped plug is bonded and fixed with an arc-shaped sealing rubber that is in movable contact with the inner wall of the arc-shaped water passage hole. The bottom of the arc-shaped plug is connected to a T-shaped guide rod. A support plate is movably sleeved on the T-shaped guide rod. The bottom of the arc-shaped plug and the top of the support plate are in movable contact with the same spring that is movably sleeved on the outside of the T-shaped guide rod.

[0016] Preferably, the T-shaped guide rod is fixedly connected to the bottom of the arc-shaped block by welding.

[0017] Preferably, the T-shaped guide rod is detachably connected to the bottom of the arc-shaped block.

[0018] Preferably, a threaded post is fixedly connected to the top of the T-shaped guide rod, a threaded groove is provided at the bottom of the arc-shaped block to be threadedly connected to the threaded post, and an operating ring is fixedly connected to the bottom of the T-shaped guide rod.

[0019] Preferably, the outer side of the cylinder is fitted with a sealing sleeve, and the outer side of the sealing sleeve is in close contact with the inner wall of the water inlet connector.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. Through the combination of the set water inlet connector, cylinder, support plate, arc-shaped water passage hole and spring support vertical guide pressure reducing and backstop component, it can use hydraulic force to elastically reduce pressure and unblock water passage during water injection, and automatically rebound and seal to perform backstop work when water supply stops;

[0022] 2. By combining the cylindrical support plate, spring support vertical guide pressure reduction and backstop assembly, threaded adjustment assembly and vertical guide support assembly, the elastic support force can be flexibly adjusted when the elastic force of the spring weakens due to subsequent elastic fatigue, so as to continue to use stably and avoid the phenomenon that it is difficult to continue to use stably due to the weakening of elastic force due to long-term use, thus improving the service life.

[0023] 3. Through the combination of the set support plate, vertical guide support assembly, spring support vertical guide pressure reducing and backstop assembly, threaded column and threaded groove, the spring can be disassembled and replaced separately when it is severely damaged after long-term use, without the need for overall replacement, which further improves service life and reduces subsequent replacement costs.

[0024] This utility model incorporates a series of structures that, during water injection, utilize hydraulic pressure to elastically depressurize and release the water flow, and automatically rebound and seal when water supply stops to prevent reverse flow. This allows for flexible adjustment of the elastic support force when the spring's elasticity weakens due to fatigue, ensuring continued stable use and preventing the phenomenon of weakened elasticity due to prolonged use, thus extending service life. Attached Figure Description

[0025] Fig. 1 This is a schematic diagram of the structure of a pressure reducing and backflow prevention device for a washing machine inlet pipe according to Embodiment 1 of this utility model;

[0026] Fig. 2 This is a schematic diagram of the main cross-sectional structure of a pressure reducing and backflow prevention device for a washing machine inlet pipe according to Embodiment 1 of this utility model;

[0027] Fig. 3 This is a front sectional view of a pressure reducing and backflow prevention device for a washing machine inlet pipe according to Embodiment 2 of this utility model.

[0028] In the diagram: 1. Main body of the water inlet pipe; 2. Water inlet end connector; 201. External threaded connector; 202. Internal thread; 3. Cylinder; 301. Arc-shaped water passage hole; 302. Support plate; 3021. First water passage hole; 303. T-shaped guide rod; 3031. Spring; 3032. Arc-shaped plug; 3033. Threaded column; 3034. Operating ring; 304. Circular ring; 3041. L-shaped guide rod; 305. External threaded sleeve; 3051. L-shaped lever. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Example 1

[0031] like Figs. 1-2 As shown, this embodiment proposes a pressure-reducing and backflow prevention device for a washing machine inlet pipe, comprising an inlet pipe body 1 and a pressure-reducing and backflow prevention device body connected and fixed at its top end. The pressure-reducing and backflow prevention device body includes:

[0032] The water inlet connector 2 is fixedly connected to the top of the water inlet pipe body 1 at its bottom. It has an internal thread 202 on its inner top and an external thread connector 201 fixedly connected to its top opening.

[0033] The cylinder 3 has an open bottom and is sealed and movably fitted inside the water inlet connector 2. A sealing sleeve is glued to the outside of the cylinder 3, and the outside of the sealing sleeve is in close contact with the inner wall of the water inlet connector 2. An arc-shaped water passage hole 301 is opened on the inner wall of the top of the cylinder 3.

[0034] The support plate 302 is movably sleeved inside the cylinder 3, and the top of the support plate 302 is provided with a plurality of first water passage holes 3021 in an annular shape;

[0035] The threaded adjustment assembly is threaded into the internal thread 202 and fixedly connected to the top of the cylinder 3; the threaded adjustment assembly is used to move up and down through the internal thread 202 during rotation to drive the cylinder 3 to adjust its height.

[0036] The vertical guide support assembly is fixedly connected between the bottom of the support plate 302 and the bottom of the cylinder 3, and makes movable contact with the bottom inner wall of the water inlet connector 2; the vertical guide support assembly is used to vertically guide and support the support plate 302.

[0037] The spring-loaded vertical guide pressure reducing and backstop assembly is installed on the support plate 302 and makes movable contact with the inner side of the arc-shaped water passage 301. The spring-loaded vertical guide pressure reducing and backstop assembly is used to elastically reduce water pressure under hydraulic pressure and unblock the arc-shaped water passage 301 to allow water to pass through. It is also used to automatically rebound and seal when the water supply stops and the water pressure disappears to perform backstop work, and to change the support elasticity when the cylinder 3 moves down.

[0038] Specifically, the threaded adjustment assembly includes an external threaded sleeve 305 threaded into the internal thread 202. The bottom of the external threaded sleeve 305 is fixedly connected to the top of the cylinder 3. L-shaped levers 3051 are fixedly connected to the inner walls on both sides of the external threaded sleeve 305. The external threaded sleeve 305 and the L-shaped levers 3051 cooperate to drive the external threaded sleeve 305 to rotate by moving the two L-shaped levers 3051. The external threaded sleeve 305 rotates within the internal thread 202 and moves downward or upward. The external threaded sleeve 305 drives the cylinder 3 to rotate and move up and down to adjust the height.

[0039] Furthermore, the vertical guide support assembly includes two L-shaped guide rods 3041 that movably contact the inner wall of the bottom of the inlet connector 2. The bottom sides of the support plate 302 are fixedly connected to the top ends of the corresponding L-shaped guide rods 3041. A ring 304 is fixedly installed at the bottom of the cylinder 3 by two screws. The ring 304 is slidably fitted onto the two L-shaped guide rods 3041. The top of the ring 304 has two vertical guide holes that slidably fit onto the outer sides of the corresponding L-shaped guide rods 3041, thus providing vertical sliding guidance for the L-shaped guide rods 3041. The L-shaped guide rod 3041 and the ring 304 cooperate to move the ring 304 and the support plate 302 downward when the cylinder 3 moves downward. The support plate 302 moves the L-shaped guide rod 3041 downward. When the L-shaped guide rod 3041 moves downward and contacts the bottom inner wall of the water inlet connector 2, it is blocked and restricted by it. At this time, the ring 304, which continues to move downward, slides downward on the two L-shaped guide rods 3041, and the cylinder 3 slides downward on the support plate 302. The two L-shaped guide rods 3041 support the support plate 302, preventing it from moving downward, thus achieving the effect of vertically guiding and supporting the support plate 302.

[0040] Furthermore, the spring-loaded vertical guide pressure-reducing and backstop assembly includes an arc-shaped plug 3032 that is movably fitted inside the arc-shaped water passage 301. The top of the arc-shaped plug 3032 is bonded and fixed with an arc-shaped sealing rubber that movably contacts the inner wall of the arc-shaped water passage 301. The bottom of the arc-shaped plug 3032 is connected to a T-shaped guide rod 303. A support plate 302 is movably fitted on the T-shaped guide rod 303. The top of the support plate 302 has a guide hole that movably contacts the outer side of the T-shaped guide rod 303, which allows the T-shaped guide rod 303 to pass through and guides it vertically. The bottom of the arc-shaped plug 3032 and the top of the support plate 302 are in movable contact with the same spring 3031 that is movably fitted on the outer side of the T-shaped guide rod 303. The spring 3031 is a stainless steel spring.

[0041] The arc-shaped plug 3032, arc-shaped sealing rubber, T-shaped guide rod 303, and spring 3031 work together. The spring 3031 provides elastic support for the arc-shaped plug 3032, and the arc-shaped plug 3032 seals the arc-shaped water passage 301. When water is supplied from the external water inlet faucet via the external threaded connector 201, the water pressure forces the arc-shaped plug 3032 downwards, releasing the seal on the arc-shaped water passage 301 and compressing the spring 3031. Under the elastic force of the spring 3031, the water is buffered and depressurized, flowing downwards through the arc-shaped water passage 301, then through multiple first water passages 3021 into the lower part of the body, and finally into the water inlet pipe 1 to supply water to the washing machine. When the water pressure drops below the elastic force of the spring 3031... Under pressure, the spring 3031, in a compressed state, causes the arc-shaped block 3032 to move upward and reset, sealing the arc-shaped water passage 301. This achieves the effect of using elastic pressure reduction to release water flow under hydraulic pressure, and automatically rebounding to seal when water supply stops, thus performing a backstop function. In addition, when the cylinder 3 moves downward to adjust its height, the cylinder 3 also causes the arc-shaped water passage 301 to press the arc-shaped block 3032 downward. When the arc-shaped block 3032 moves downward, it compresses the spring 3031 downward, which can change the initial compression degree of the spring 3031, achieving the effect of flexibly adjusting the elastic support force. This avoids the phenomenon that the entire device cannot continue to be used stably after adjustment due to the elastic fatigue of the spring 3031 after long-term use, thus improving its service life.

[0042] Furthermore, the T-shaped guide rod 303 is fixedly connected to the bottom of the arc-shaped block 3032 by welding.

[0043] This embodiment can utilize hydraulic elastic pressure reduction to release water flow during water injection, and automatically rebound to seal and prevent backflow when water supply stops; it can also flexibly adjust the elastic support force when the elastic fatigue of spring 3031 weakens, so as to continue stable use and avoid the phenomenon that the elastic fatigue weakens due to long-term use, which makes it difficult to continue stable use, thus improving service life.

[0044] The usage method of this embodiment is as follows: When using the washing machine's water inlet pipe pressure reducing and backflow prevention device, connect the external threaded connector 201 to the external water pipe, open the water inlet tap, and under the action of water inlet pressure, the water pressure squeezes and drives the arc-shaped plug 3032 to move down to release the blockage of the arc-shaped water passage 301. The arc-shaped plug 3032 drives the T-shaped guide rod 303 to move down and compress the spring 3031. Under the elastic force of the spring 3031, the arc-shaped plug 3032 works together to buffer and reduce the pressure of the water. Water enters downward through the arc-shaped water passage 301, then flows downward through multiple first water passages 3021, and is then supplied into the main body 1 of the water inlet pipe for the washing machine to supply water. When the water pressure drops below the elastic pressure of the spring 3031, the spring force of the spring 3031 in the compressed state drives the arc-shaped block 3032 to move upward and reset to seal the arc-shaped water passage 301. This achieves the effect of using water force to elastically depressurize and unseal the water passage, and automatically rebounds and seals when the water supply stops to perform the reverse stop function.

[0045] When the elasticity weakens due to prolonged use and adjustment is needed, after separating the external threaded connector 201 from the external water pipe, move the two L-shaped levers 3051 to drive the external threaded sleeve 305 to rotate forward. The external threaded sleeve 305 rotates and moves downward within the internal thread 202. The external threaded sleeve 305 drives the cylinder 3 to rotate and move downward. The cylinder 3, through the ring 304, drives the two L-shaped guide rods 3041 to rotate and rub against the inner wall of the bottom of the water inlet connector 2. The cylinder 3 also drives the ring 304 to slide downward on the two L-shaped guide rods 3041. At the same time, the cylinder 3 drives the arc-shaped water passage. 301 presses the arc-shaped block 3032 downwards. When the arc-shaped block 3032 moves downwards, it compresses the spring 3031 downwards, which can change the initial compression degree of the spring 3031 and achieve the effect of flexibly adjusting the elastic support force. Personnel can use an external pressure gauge to press the arc-shaped block 3032 to test the elastic support force, so that the elastic support force can be flexibly adjusted when the elastic fatigue force of the spring 3031 weakens in the future, so as to continue to use stably and avoid the phenomenon that the elastic fatigue force weakens due to long-term use, which makes it difficult to continue to use stably, thus improving the service life.

[0046] Example 2

[0047] like Fig. 3As shown, this embodiment differs from Embodiment 1 in that: the T-shaped guide rod 303 is detachably connected to the bottom of the arc-shaped block 3032, wherein a threaded post 3033 is fixedly connected to the top of the T-shaped guide rod 303, and a threaded groove is provided at the bottom of the arc-shaped block 3032 for threaded engagement with the threaded post 3033. An operating ring 3034 is fixedly connected to the bottom of the T-shaped guide rod 303. The threaded post 3033, threaded groove, and operating ring 3034 work together so that when the external threaded sleeve 305 is rotated in the opposite direction to be screwed upwards, the external threaded sleeve 305 drives the cylinder 3 upwards, allowing personnel to remove the two screws using a screwdriver. Next, release the fixing of the ring 304, and then pull down the L-shaped guide rod 3041 to move the support plate 302 downward. The support plate 302 moves the arc-shaped block 3032 downward through the T-shaped guide rod 303. Hold the arc-shaped block 3032 with one hand, and rotate the operating ring 3034 in the opposite direction with the other hand to make it drive the T-shaped guide rod 303 to rotate in the opposite direction. The T-shaped guide rod 303 drives the threaded column 3033 to rotate away from the threaded groove, realizing the separation from the arc-shaped block 3032. Then the spring 3031 can be removed and replaced. This allows the spring 3031 to be replaced separately when it is damaged after long-term use, without the need for overall replacement, further improving service life and reducing subsequent replacement costs.

[0048] This embodiment allows for the individual disassembly and replacement of spring 3031 when it is severely damaged after long-term use, eliminating the need for complete replacement, thus further extending its service life and reducing subsequent replacement costs.

[0049] The usage method of this embodiment is as follows: Unlike Embodiment 1, this embodiment also has the following functions: When the spring 3031 is severely damaged and needs replacement after long-term use, the external threaded sleeve 305 is rotated in the opposite direction to be screwed upwards. After the external threaded sleeve 305 moves the cylinder 3 upwards, the operator can use a screwdriver to remove the two screws, releasing the fixing of the ring 304. Then, the L-shaped guide rod 3041 is pulled downwards to move the support plate 302 downwards. The support plate 302, through the T-shaped guide rod 303, moves the arc-shaped block 3032 downwards. One hand holds the arc-shaped block 3032, and the other hand rotates the operating ring 3034 in the opposite direction to make it rotate the T-shaped guide rod 303 in the opposite direction. The T-shaped guide rod 303 drives the threaded column 3033 to separate from the threaded groove, achieving separation from the arc-shaped block 3032. The spring 3031 can then be removed and replaced. This achieves the effect of replacing the spring 3031 separately when it is severely damaged after long-term use, without the need for overall replacement, further improving service life and reducing subsequent replacement costs.

[0050] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pressure-reducing and backflow prevention device for a washing machine inlet pipe, comprising an inlet pipe body (1) and a pressure-reducing and backflow prevention device body connected and fixed at its top end, characterized in that: The pressure reducing check device body includes: The water inlet connector (2) is connected and fixed at the top of the water inlet pipe body (1) at its bottom. It has an internal thread (202) on its inner top and an external thread connector (201) is fixedly connected to the opening at its top. A cylindrical tube (3) with an open bottom is fitted and sealed inside the water inlet connector (2). An arc-shaped water passage hole (301) is provided on the inner wall of the top of the cylindrical tube (3). The support plate (302) is movably sleeved inside the cylinder (3), and the top of the support plate (302) is provided with a plurality of first water passage holes (3021) in an annular shape; The threaded adjustment assembly is threaded into the internal thread (202) and fixedly connected to the top of the cylinder (3); The vertical guide support assembly is fixedly connected between the bottom of the support plate (302) and the bottom of the cylinder (3), and makes movable contact with the bottom inner wall of the water inlet connector (2); The spring support vertical guide pressure reducing backstop assembly is installed on the support plate (302) and makes active contact with the inner side of the arc-shaped water passage (301).

2. The pressure reducing and backflow prevention device for the water inlet pipe of a washing machine according to claim 1, characterized in that: The threaded adjustment assembly includes an external threaded sleeve (305) that is threaded into the internal thread (202). The bottom of the external threaded sleeve (305) is fixedly connected to the top of the cylinder (3). L-shaped levers (3051) are fixedly connected to the inner walls on both sides of the external threaded sleeve (305).

3. The pressure reducing and backflow prevention device for the water inlet pipe of a washing machine according to claim 1, characterized in that: The vertical guide support assembly includes two L-shaped guide rods (3041) that are in movable contact with the bottom inner wall of the water inlet connector (2). The bottom sides of the support plate (302) are respectively fixedly connected to the top of the corresponding L-shaped guide rods (3041). The bottom of the cylinder (3) is fixedly installed with a ring (304) by two screws. The ring (304) is slidably sleeved on the two L-shaped guide rods (3041).

4. The pressure reducing and backflow prevention device for the water inlet pipe of a washing machine according to claim 1, characterized in that: The spring-loaded vertical guide pressure-reducing and backstop assembly includes an arc-shaped plug (3032) that is movably sleeved inside an arc-shaped water passage (301). The top of the arc-shaped plug (3032) is bonded and fixed with an arc-shaped sealing rubber that is in movable contact with the inner wall of the arc-shaped water passage (301). The bottom of the arc-shaped plug (3032) is connected to a T-shaped guide rod (303). The support plate (302) is movably sleeved on the T-shaped guide rod (303). The bottom of the arc-shaped plug (3032) and the top of the support plate (302) are in movable contact with the same spring (3031) that is movably sleeved on the outside of the T-shaped guide rod (303).

5. A pressure reducing and backflow prevention device for a washing machine inlet pipe according to claim 4, characterized in that: The T-shaped guide rod (303) is fixedly connected to the bottom of the arc-shaped block (3032) by welding.

6. A pressure reducing and backflow prevention device for a washing machine inlet pipe according to claim 4, characterized in that: The T-shaped guide rod (303) is detachably connected to the bottom of the arc-shaped block (3032).

7. A pressure reducing and backflow prevention device for a washing machine inlet pipe according to claim 6, characterized in that: The top end of the T-shaped guide rod (303) is fixedly connected to a threaded post (3033), the bottom of the arc-shaped block (3032) is provided with a threaded groove that is threadedly connected to the threaded post (3033), and the bottom of the T-shaped guide rod (303) is fixedly connected to an operating ring (3034).

8. A pressure reducing and backflow prevention device for a washing machine inlet pipe according to claim 1, characterized in that: The outer side of the cylinder (3) is fitted with a sealing sleeve, and the outer side of the sealing sleeve is in close contact with the inner wall of the water inlet connector (2).

Images