Backflow prevention device for water supply pipeline

Abstract

The utility model discloses a water supply pipeline anti-backflow device which comprises a shell, a water passing cavity is formed in the shell, a water inlet is formed in the left end of the shell, a collecting opening is formed between the water inlet and the water passing cavity, a water outlet is formed in the right end of the shell, and a self-sealing core is fixedly installed in the water outlet. The device comprises a water passing cavity, a non-return device is fixedly installed in the water passing cavity through a plurality of supports, a spring is installed in the non-return device, the left end of the spring is fixedly connected with a limiting plate, the center of the left side wall face of the limiting plate penetrates through the wall face of the non-return device to be connected with a connecting rod, and a sealing plate is fixedly installed at the tail end of the connecting rod. A double one-way sealing structure is adopted, after water supply is stopped, the sealing plate blocks a convergent opening channel, water flow stops moving, then the self-sealing core is automatically sealed, the water flow in the water passing cavity is sealed, the service life of the spring can be prolonged through the water which stops flowing, the sealing effect is improved, and slow seepage and backflow are prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of water supply, in particular to a backflow prevention device for a water supply pipeline. Background Art

[0002] Water supply refers to the provision of water resources through public facilities, commercial organizations, community efforts or individuals. Water is usually transported through pumps and pipes. Municipalities need water in the normal use process, and water supply requires water pipes. However, existing water pipes cannot prevent backflow. The backflow of external water can easily pollute the water source, reducing the practicality of the water pipes and making them inconvenient for users.

[0003] Existing water pipe backflow prevention devices often use a one-way movable baffle structure. When water flows back, the baffle is pushed to seal the passage to prevent backflow. However, after long-term use, the one-way baffle structure is prone to fatigue of the baffle spring, which reduces the elastic force of the spring, resulting in loose sealing of the baffle and prone to slow seepage backflow. Utility Model Content

[0004] In view of the deficiencies in the prior art, the present invention provides a water supply pipeline backflow prevention device, which solves the technical problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a water supply pipeline backflow prevention device, comprising a shell, a water passage cavity is provided in the shell, a water inlet is provided at the left end of the shell, a convergence port is provided between the water inlet and the water passage cavity, a water outlet is provided at the right end of the shell, a self-sealing core is fixedly installed in the water outlet, a backstop is fixedly installed in the water passage cavity by using a number of brackets, a spring is installed in the backstop, the left end of the spring is fixedly connected to a limiting plate, a connecting rod is connected to the center of the left side wall of the limiting plate through the wall of the backstop, a sealing plate is fixedly installed at the end of the connecting rod, and a guide surface is fixedly installed at the center of the left side wall of the sealing plate.

[0006] Preferably, the convergence port is a conical structure with an inner diameter gradually decreasing from left to right.

[0007] Preferably, the guide surface is an arc structure, and the maximum diameter of the guide surface is equal to the minimum inner diameter of the convergence port.

[0008] Preferably, the diameter of the sealing plate is larger than the minimum inner diameter of the constriction port, and a sealing ring is installed on the contact surface between the sealing plate and the constriction port.

[0009] Preferably, one end of the spring is fixedly mounted on the inner wall surface of the backstop, and the other end of the spring is fixedly mounted on the inner wall surface of the limiting plate, and the spring is in a compressed state under normal conditions.

[0010] Preferably, the self-sealing core adopts a magnetic silica gel structure, and the tail ends of the self-sealing core are adsorbed and sealed to each other under normal conditions.

[0011] Beneficial effects

[0012] The utility model provides a backflow prevention device for a water supply pipeline, which has the following beneficial effects: when the device is in use, a double one-way sealing structure is adopted, and the water flow can increase the pressure after passing through the convergence port, reducing the water pressure requirement for opening the passage; after the water supply is stopped, the sealing plate blocks the convergence port passage to stop the water flow, and then the self-sealing core automatically seals to seal the water flow in the water passage cavity. The stopped flowing water can extend the service life of the spring, increase the sealing effect, and prevent slow seepage backflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural schematic diagram of a water supply pipeline backflow prevention device described in the utility model.

[0014] In the figure: 1. Shell; 2. Water inlet; 3. Constriction port; 4. Sealing plate; 5. Guide surface; 6. Connecting rod; 7. Backstop; 8. Limit plate; 9. Spring; 10. Bracket; 11. Water outlet; 12. Self-sealing core; 13. Water cavity. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] See also Figure 1 The utility model provides a technical solution for a backflow prevention device for a water supply pipeline: a backflow prevention device for a water supply pipeline, comprising a shell 1, a water passage cavity 13 being provided in the shell 1, a water inlet 2 being provided at the left end of the shell 1, a convergence port 3 being provided between the water inlet 2 and the water passage cavity 13, a water outlet 11 being provided at the right end of the shell 1, a self-sealing core 12 being fixedly installed in the water outlet 11, a backstop 7 being fixedly installed in the water passage cavity 13 by using a plurality of brackets 10, a spring 9 being installed in the backstop 7, the left end of the spring 9 being fixedly connected to a limiting plate 8, a connecting rod 6 being connected to the wall surface of the backstop 7 through the center of the left side wall of the limiting plate 8, a sealing plate 4 being fixedly installed at the end of the connecting rod 6, and a guide surface 5 being fixedly installed at the center of the left side wall of the sealing plate 4.

[0017] Furthermore, the convergence port 3 is a tapered structure with an inner diameter gradually decreasing from left to right.

[0018] Furthermore, the guide surface 5 has an arc structure, and the maximum diameter of the guide surface 5 is equal to the minimum inner diameter of the convergence port 3 .

[0019] Furthermore, the diameter of the sealing plate 4 is larger than the minimum inner diameter of the constriction opening 3 , and a sealing ring is installed on the contact surface between the sealing plate 4 and the constriction opening 3 .

[0020] Furthermore, one end of the spring 9 is fixedly mounted on the inner wall surface of the backstop 7 , and the other end of the spring 9 is fixedly mounted on the inner wall surface of the limit plate 8 , and the spring 9 is in a compressed state under normal conditions.

[0021] Furthermore, the self-sealing core 12 adopts a magnetic silicone structure, and the tail ends of the self-sealing core 12 are attracted to each other and sealed under normal conditions.

[0022] Embodiment: When the device is in use, the shell 1 is installed in a water supply pipeline, the water inlet end is the water inlet 2, and the water outlet end is the water outlet 11.

[0023] When supplying water, the water first flows into the convergence port 3 from the water inlet 2. As the inner diameter of the convergence port 3 gradually decreases, the water flow velocity increases and the water pressure increases. When the water flows into the guide surface 5, it is diverted to the surrounding of the guide surface 5, pushing the sealing plate 4 to move inward, opening the passage between the sealing plate 4 and the convergence port 3. After the water flows into the water cavity 13 and then passes through the self-sealing core 12, the end of the self-sealing core 12 is stretched open, so that the water flows in one direction.

[0024] When the water supply is stopped, the water flow rate in the pipeline decreases to a stop and the water pressure decreases. When the water pressure acting on the sealing plate 4 is less than the reset pressure of the spring 9, the spring 9 will push the sealing plate 4 to seal the passage of the convergence port 3. At the same time, the end of the self-sealing core 12 will reclose and seal under the action of magnetic attraction to prevent backflow.

[0025] When the device is in use, a double one-way sealing structure is adopted. After the water flows through the constriction port, the pressure can be increased, which reduces the water pressure requirement for opening the passage. After the water supply is stopped, the sealing plate blocks the constriction port passage to stop the water flow, and then the self-sealing core automatically seals to seal the water flow in the water cavity. The stopped flowing water can extend the service life of the spring, increase the sealing effect, and prevent slow seepage backflow.

[0026] It should be noted that, in this document, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any actual relationship or order between these entities or operations.

Claims

1. A water supply pipeline backflow prevention device, comprising a housing (1), characterized in that: A water passage cavity (13) is provided in the shell (1), a water inlet (2) is provided at the left end of the shell (1), a constriction port (3) is provided between the water inlet (2) and the water passage cavity (13), a water outlet (11) is provided at the right end of the shell (1), a self-sealing core (12) is fixedly installed in the water outlet (11), a check valve (7) is fixedly installed in the water passage cavity (13) by using a plurality of brackets (10), a spring (9) is installed in the check valve (7), the left end of the spring (9) is fixedly connected to a limiting plate (8), the center of the left side wall of the limiting plate (8) passes through the wall of the check valve (7) and is connected to a connecting rod (6), the end of the connecting rod (6) is fixedly installed with a sealing plate (4), and the center of the left side wall of the sealing plate (4) is fixedly installed with a guide surface (5).

2. A water supply pipeline backflow prevention device according to claim 1, characterized in that: The converging opening (3) is a tapered structure with an inner diameter gradually decreasing from left to right.

3. The water supply pipeline backflow prevention device according to claim 1, characterized in that: The guide surface (5) has an arc structure, and the maximum diameter of the guide surface (5) is equal to the minimum inner diameter of the convergence port (3).

4. The water supply pipeline backflow prevention device according to claim 1, characterized in that: The diameter of the sealing plate (4) is greater than the minimum inner diameter of the constriction opening (3), and a sealing ring is installed on the contact surface between the sealing plate (4) and the constriction opening (3).

5. The water supply pipeline backflow prevention device according to claim 1, characterized in that: One end of the spring (9) is fixedly mounted on the inner wall surface of the backstop (7), and the other end of the spring (9) is fixedly mounted on the inner wall surface of the limit plate (8), and the spring (9) is in a compressed state under normal conditions.

6. The water supply pipeline backflow prevention device according to claim 1, characterized in that: The self-sealing core (12) adopts a magnetic silica gel structure, and the tail ends of the self-sealing core (12) are adsorbed and sealed with each other under normal conditions.

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