Novel backflow preventer

Abstract

The utility model discloses a novel backflow preventer, and relates to the technical field of pipelines. The device comprises a main pipeline, annular sliding grooves are symmetrically formed in the circumferential side face in the main pipeline, check valves are symmetrically arranged on the circumferential side face in the main pipeline, a cavity is formed between the two check valves, each check valve comprises a cross-shaped drainage plate and a water baffle, and clamping blocks are symmetrically arranged on the circumferential side face of the cross-shaped drainage plate; the clamping blocks are matched with the annular sliding grooves in shape and size, the clamping blocks are rotationally fixed after being embedded into the annular sliding grooves, and a sealing ring is arranged on the surface of one side of the cross-shaped drainage plate. The maintenance opening is formed in the peripheral side face of the main pipeline, the check valve on the annular sliding groove in the main pipeline can be quickly disassembled and assembled by opening the maintenance opening, meanwhile, the check valve is of a detachable structure so that a sealing ring can be replaced in the check valve and other parts can be repaired at regular time in the future, and meanwhile the filter screen is arranged at the water outlet, so that the maintenance is convenient. And impurities doped in water flow backflow of the filter screen are prevented from blocking and damaging the interior of the pipeline.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipelines, and particularly relates to a novel backflow preventer. Background Art

[0002] A backflow preventer is a device composed of non-return components that can prevent water in a water pipe from flowing back. A traditional backflow preventer is composed of a single check valve. When a single sealing structure is damaged, the check valve will directly lose its function, resulting in backflow and the backflow preventer will lose its function. At the same time, the traditional backflow preventer lacks a simple and effective anti-blocking structure, which makes the pipeline of the backflow preventer easily blocked, and there is a problem of poor filtering and impurity removal performance, which makes the entire backflow preventer lose its function. Utility Model Content

[0003] The purpose of the utility model is to provide a novel backflow preventer to solve the existing problems.

[0004] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0005] A novel backflow preventer comprises a main pipe, an annular groove is symmetrically provided on the inner wall of the main pipe, a check valve is arranged in the annular groove, a cavity is formed between the two check valves, the check valve comprises a cross drain plate and a water baffle plate, a clamping block is symmetrically provided on the peripheral side of the cross drain plate, a mounting groove is provided on one surface of the annular groove, the shape and size of the clamping block are adapted to the mounting groove, the clamping block is inserted into the annular groove and then rotated and fixed through the mounting groove, a sealing ring is provided on one side surface of the cross drain plate, an annular groove adapted to the size of the sealing ring is provided on the periphery of the water baffle plate, a spring is fixedly connected to one side of the cross drain plate, a valve stem is inserted inside the spring, a nut is threadedly connected to the free end of the valve stem, the valve stem is threadedly connected to the nut after passing through the cross drain plate, the sealing ring and the water baffle plate, a mounting block is provided on one side of the main pipe, a filter screen is provided on one side of the mounting block, a second screw is inserted on one side of the filter screen, and the second screw is threadedly connected to the mounting block.

[0006] A maintenance port is provided on the peripheral side of the main pipe, the maintenance port is communicated with the main pipe, a sealing plate is provided on the surface of the maintenance port, first screws are symmetrically inserted on the surface of the sealing plate, and the first screws are threadedly connected to the peripheral side of the maintenance port.

[0007] The main pipeline is threadedly connected to a sealing connection plate on its circumferential side, and the sealing connection plate is connected to a secondary pipeline. Both ends of the secondary pipeline are connected to the main pipeline. The cross-section of the secondary pipeline is U-shaped. A one-way valve is arranged inside the secondary pipeline, and the internal structure of the one-way valve is the same as that of the check valve.

[0008] A sewage outlet is provided on the side surface of the auxiliary pipeline, and the sewage outlet is communicated with the auxiliary pipeline.

[0009] A water outlet and a water inlet are respectively arranged at both ends of the main pipeline, and connecting flanges are fixedly connected to the surfaces of the water outlet and the water inlet.

[0010] The utility model has the following beneficial effects:

[0011] The utility model is provided with a maintenance port on the side surface around the main pipeline, and the non-return valve on the annular slide groove inside the main pipeline can be quickly disassembled and installed by opening the maintenance port. At the same time, the non-return valve is a detachable structure so as to facilitate the replacement of the internal sealing ring and the maintenance of other parts at a regular time in the future. At the same time, a filter screen is arranged at the water outlet, and the filter screen removes impurities mixed in the water backflow to prevent the impurities from clogging and damaging the inside of the pipeline. At the same time, the two non-return valves are not connected, and any one of them can be used normally when the other is damaged. The lower surface of the main pipeline is connected with a secondary pipeline, and the non-return valve inside the secondary pipeline can discharge the water from the sewage outlet when the water flows back.

[0012] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 It is a schematic diagram of the overall structure of a new type of backflow preventer;

[0015] Figure 2 It is the front view of a new type of backflow preventer;

[0016] Figure 3 for Figure 2 Cross-section of the middle AA;

[0017] Figure 4 It is the left view of a new type of backflow preventer;

[0018] Figure 5 It is a cross-sectional view of the annular chute 16.

[0019] In the attached drawings, the list of parts represented by each number is as follows: 1. Main pipeline; 2. Maintenance port; 3. Sealing plate; 4. First screw; 5. Flange; 6. Sealing connecting plate; 7. Block; 8. Drain outlet; 9. Check valve; 10. Valve stem; 11. Spring; 12. Cross drain plate; 13. Sealing ring; 14. Water retaining plate; 15. Nut; 16. Annular slide; 17. Mounting block; 18. Filter; 19. Water outlet; 20. Water inlet; 21. One-way valve; 22. Auxiliary pipeline; 23. Second screw; 24. Mounting groove. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limitations on the present invention.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] See also Figure 1-4As shown, the novel backflow preventer of this embodiment includes a main pipeline 1, an annular chute 16 is symmetrically provided on the inner wall of the main pipeline 1, a check valve 9 is arranged in the annular chute 16, a cavity is formed between the two check valves 9, the check valve 9 includes a cross drain plate 12 and a water retaining plate 14, a block 7 is symmetrically provided on the side of the cross drain plate 12, a mounting notch 24 is provided on one surface of the annular chute 16, the shape and size of the block 7 are adapted to the mounting notch 24, the block 7 is inserted into the annular chute 16 through the mounting notch 24 and then rotated and fixed, and a surface of one side of the cross drain plate 12 is provided There is a sealing ring 13, and an annular groove corresponding to the size of the sealing ring 13 is opened around the water retaining plate 14. A spring 11 is fixedly connected to one side of the cross drain plate 12, and a valve stem 10 is inserted inside the spring 11. The free end of the valve stem 10 is threadedly connected with a nut 15. The valve stem 10 passes through the cross drain plate 12, the sealing ring 13 and the water retaining plate 14 and is threadedly connected with the nut 15. A mounting block 17 is opened on one side of the main pipeline 1, and a filter screen 18 is arranged on one side of the mounting block 17. A second screw 23 is inserted on one side of the filter screen 18, and the second screw 23 is threadedly connected to the mounting block 17.

[0024] Furthermore, a maintenance port 2 is opened on the side surface of the main pipeline 1, and the maintenance port 2 is communicated with the main pipeline 1. A sealing plate 3 is arranged on the surface of the maintenance port 2, and first screws 4 are symmetrically inserted on the surface of the sealing plate 3. The first screws 4 are threadedly connected to the side surface of the maintenance port 2.

[0025] Furthermore, a sealing connecting plate 6 is threadedly connected to the side of the main pipeline 1, and the sealing connecting plate 6 is connected to a secondary pipeline 22. Both ends of the secondary pipeline 22 are connected to the main pipeline 1. The cross-section of the secondary pipeline 22 is U-shaped. A one-way valve 21 is arranged inside the secondary pipeline 22. The internal structure of the one-way valve 21 is the same as that of the check valve 9.

[0026] Furthermore, a sewage outlet 8 is opened on the side surface of the auxiliary pipeline 22 , and the sewage outlet 8 is communicated with the auxiliary pipeline 22 .

[0027] Furthermore, a water outlet 19 and a water inlet 20 are respectively provided at both ends of the main pipeline 1 , and connecting flanges 5 are fixedly connected to the surfaces of the water outlet 19 and the water inlet 20 .

[0028] It should be noted that during the use of the backflow preventer, water flows in from the water inlet 20, passes through the connection between the main pipe 1 and the secondary pipe 22, and enters the secondary pipe 22. The water continues to flow in and pushes the one-way valve 21 upward. When the one-way valve 21 rises to a certain height, it will block the sewage outlet 8 to prevent a part of the water from flowing out of the sewage outlet 8 during use. While the one-way valve 21 blocks the sewage outlet 8, the water pushes the water baffle 14. A sealing ring 13 is installed in the groove on one side of the water baffle 14, so that the water baffle 14 drives the valve stem 10 to move toward the check valve 9 on the other side. The water flows into the main pipe 1 from the water inlet 20 and the check valve 9. At this time, the spring 11 is squeezed by force, and then The water flows through the check valve 9 set on the other side in the same way. When the water flows back, it means that the water flow at the water inlet 20 is reduced or closed. At this time, the water baffle 14 seals the check valve 9 under the elastic force of the spring 11. At the same time, the one-way valve 21 in the auxiliary pipe 22 returns to its original position as the water flow decreases or closes, so that the water in the cavity of the main pipe 1 is discharged. At the same time, a filter screen 18 is set on one side of the water outlet 19. The filter screen 18 can block impurities mixed in the backflow when the water flows back to prevent damage to the check valve 9. Since the maintenance port 2 is set on the peripheral side of the main pipe 1, the check valve 9, filter screen 18 and one-way valve 21 inside the main pipe 1 can be regularly repaired and replaced through the maintenance port 2.

[0029] In the description of this specification, the description of reference terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and describes these embodiments in detail in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is only limited by the claims and their full scope and equivalents.

Claims

1. A novel backflow preventer, comprising a main pipeline (1), characterized in that: The inner wall of the main pipeline (1) is provided with an annular groove (16), a check valve (9) is provided in the annular groove (16), a cavity is formed between the two check valves (9), the check valve (9) comprises a cross drain plate (12) and a water baffle plate (14), a clamping block (7) is symmetrically provided on the side surface of the cross drain plate (12), a mounting notch (24) is provided on one surface of the annular groove (16), the shape and size of the clamping block (7) are adapted to the mounting notch (24), the clamping block (7) is inserted into the annular groove (16) through the mounting notch (24) and then rotated and fixed, a sealing ring (13) is provided on one side surface of the cross drain plate (12), the water baffle plate (14) is provided with a sealing ring (13), and the water baffle plate (14) is provided with a sealing ring (13) on one side surface of the cross drain plate (12). ) is provided with an annular groove corresponding to the size of the sealing ring (13) on the periphery of the cross drain plate (12); a spring (11) is fixedly connected to one side of the cross drain plate (12); a valve stem (10) is inserted into the interior of the spring (11); a nut (15) is threadedly connected to the free end of the valve stem (10); the valve stem (10) passes through the cross drain plate (12), the sealing ring (13) and the water retaining plate (14) and is threadedly connected to the nut (15); a mounting block (17) is provided on one side of the main pipeline (1); a filter screen (18) is provided on one side of the mounting block (17); a second screw (23) passes through one side of the filter screen (18); the second screw (23) is threadedly connected to the mounting block (17).

2. A new backflow preventer according to claim 1, characterized in that: A maintenance port (2) is provided on the peripheral side of the main pipeline (1), the maintenance port (2) is communicated with the main pipeline (1), a sealing plate (3) is provided on the surface of the maintenance port (2), a first screw (4) is symmetrically inserted on the surface of the sealing plate (3), and the first screw (4) is threadedly connected to the peripheral side of the maintenance port (2).

3. A new backflow preventer according to claim 1, characterized in that: The main pipeline (1) is threadedly connected to a sealing connection plate (6), and the sealing connection plate (6) is connected to a secondary pipeline (22). Both ends of the secondary pipeline (22) are in communication with the main pipeline (1). The cross section of the secondary pipeline (22) is U-shaped. A one-way valve (21) is arranged inside the secondary pipeline (22), and the internal structure of the one-way valve (21) is the same as that of the check valve (9).

4. A new backflow preventer according to claim 3, characterized in that: A sewage outlet (8) is provided on the side surface of the auxiliary pipeline (22), and the sewage outlet (8) is communicated with the auxiliary pipeline (22).

5. A novel backflow preventer according to claim 1, characterized in that: A water outlet (19) and a water inlet (20) are respectively provided at both ends of the main pipeline (1), and connecting flanges (5) are fixedly connected to the surfaces of the water outlet (19) and the water inlet (20).

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