Backflow preventer

Abstract

The utility model discloses a backflow preventer, and relates to the technical field of backflow preventers, the backflow preventer comprises a valve body and a filter pipe, the outer wall of the valve body is movably sleeved with the filter pipe, the filter pipe is internally provided with a filter assembly, and the filter assembly is used for filtering large-particle impurities in sewage flowing into the valve body. The filter assembly comprises a positioning groove, a fixing frame, a mounting frame, a positioning block and a filter screen. By installing the filtering assembly, large-particle impurities in sewage are filtered, the problem that the large-particle impurities enter the valve body to cause abrasion or blockage of an internal structure is solved, and the large-particle impurities are prevented from interfering with normal work of the backflow preventer.

Description

Technical Field

[0001] This utility model relates to the field of backflow prevention technology, specifically a backflow prevention device. Background Technology

[0002] With the acceleration of urbanization and the continuous expansion of water supply systems, the problem of backflow in pipelines has become increasingly prominent, posing a serious threat to water quality safety. Consequently, the application of backflow preventers in pipelines is increasing. Backflow preventers are used to prevent sewage from flowing back into pipelines, thus avoiding backflow pollution. When a backflow tendency occurs in the pipeline, the backflow preventer, through internal components such as check valves and drain valves, discharges the backflowing medium outside the pipe, effectively preventing sewage backflow.

[0003] Traditional backflow preventers often lack the function of filtering large particles of impurities in wastewater, allowing these particles to directly enter the device's interior, causing wear and blockage of its internal structure. This interferes with the device's normal operation, leading to premature damage and frequent replacements. Utility Model Content

[0004] The purpose of this utility model is to provide a backflow preventer to solve the technical problems of premature damage and frequent replacement of backflow preventers mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a backflow preventer, comprising a valve body and a filter tube, wherein the filter tube is movably fitted onto the outer wall of the valve body, and a filter assembly is installed inside the filter tube. The filter assembly is used to filter large particulate impurities in sewage flowing into the valve body. The filter assembly includes: a positioning groove, a fixing frame, an installation frame, a positioning block, and a filter screen. The filter tube is movably fitted onto the fixing frame, and positioning blocks are symmetrically fixedly installed on the bottom of the outer wall of the fixing frame. A positioning groove is provided on the inner wall of the filter tube, and the positioning groove is movably fitted onto the outer wall of the positioning block. An installation frame is fixedly installed on the bottom of the outer wall of the fixing frame, and a filter tube is movably fitted onto the outer wall of the installation frame. A filter screen is fixedly installed on the inner wall of the installation frame.

[0006] Preferably, an installation bracket is movably installed on the inner wall of the filter tube, the installation bracket is movably fitted onto the outer wall of the rotating shaft, a turbine fan is fixedly installed at the bottom of the outer wall of the rotating shaft, a connecting component is fixedly installed at the top of the outer wall of the rotating shaft, a connecting rod is fixedly installed at the top of the outer wall of the connecting component, and a cleaning brush is fixedly installed at the top of the outer wall of the connecting rod, the cleaning brush being in contact with the filter screen.

[0007] Preferably, a rubber ring is movably fitted on the outer wall of the valve body, and the filter tube is movably fitted on the outer wall of the rubber pad, with the rubber pad fitting against the fixed frame.

[0008] Preferably, the connecting assembly includes: a first connecting block, a second connecting block, and a compression spring. The connecting assembly is used to elastically push the connecting rod and the cleaning brush, so that the cleaning brush is in close contact with the filter screen. The first connecting block is fixedly installed on the top of the outer wall of the rotating shaft. The first connecting block is movably fitted onto the outer wall of the second connecting block. The compression spring is fixedly installed on the top of the inner wall of the first connecting block. The second connecting block is fixedly installed on the top of the outer wall of the compression spring. The connecting rod is fixedly installed on the top of the outer wall of the second connecting block.

[0009] Preferably, the inner wall of the filter tube is symmetrically provided with mounting grooves, which are movably fitted onto the outer wall of the mounting bracket.

[0010] Preferably, the outer wall of the second connecting block is symmetrically fixedly installed with limiting blocks, and the inner wall of the first connecting block is symmetrically provided with limiting grooves, which are movably fitted onto the outer wall of the limiting blocks.

[0011] Preferably, the valve body and the filter tube are connected by threads, and the outer wall threads of the valve body and the outer wall threads of the filter tube have the same specifications.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. In this utility model, the positioning block is inserted into the positioning groove in the filter tube, so that the fixing frame and the mounting frame on the positioning block are fixed inside the filter tube. The filter screen of the mounting frame can filter the sewage flowing into the valve body. The filter screen prevents large particulate impurities in the sewage from entering the valve body. By installing the filter assembly, the large particulate impurities in the sewage are filtered, which solves the problem of large particulate impurities entering the valve body and causing wear or blockage of the internal structure, and avoids large particulate impurities interfering with the normal operation of the backflow preventer.

[0014] 2. In this utility model, during the process of sewage flowing into the filter pipe, the water flow drives the turbine fan to rotate, the turbine fan drives the rotating shaft to rotate, the rotating shaft drives the connecting assembly and connecting rod to rotate, and the connecting rod drives the cleaning brush to rotate. During the rotation process, the cleaning brush comes into contact with the filter screen, so that the cleaning brush continuously cleans large particles of impurities on the filter screen and crushes the impurities that are stuck together, so as to avoid impurities clogging the filter screen and improve the service life of the filter pipe. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a cross-sectional view of the filter tube of this utility model;

[0017] Figure 3 This is a schematic diagram of the internal structure of the filter tube of this utility model;

[0018] Figure 4 This is a schematic diagram of the connecting component of this utility model.

[0019] In the diagram: 1. Valve body; 2. Filter tube; 3. Rubber ring; 4. Positioning groove; 5. Fixing frame; 6. Mounting frame; 7. Positioning block; 8. Filter screen; 9. Mounting bracket; 10. Rotating shaft; 11. Turbine fan; 12. First connecting block; 13. Connecting rod; 14. Cleaning brush; 15. Limiting groove; 16. Second connecting block; 17. Limiting block; 18. Compression spring; 19. Rubber pad; 20. Mounting slide. Detailed Implementation

[0020] 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.

[0021] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" 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 an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] Example 1, please refer to Figure 1 and Figure 3A backflow preventer includes a valve body 1 and a filter tube 2. The filter tube 2 is movably fitted onto the outer wall of the valve body 1. A filter assembly is installed inside the filter tube 2. The filter assembly is used to filter large particulate impurities in sewage flowing into the valve body 1. The filter assembly includes: a positioning groove 4, a fixing frame 5, an mounting frame 6, a positioning block 7, and a filter screen 8. The filter tube 2 is movably fitted onto the fixing frame 5. Positioning blocks 7 are symmetrically fixedly installed on the bottom of the outer wall of the fixing frame 5. The inner wall of the filter tube 2 has a positioning groove 4, which is movably fitted onto the outer wall of the positioning block 7. The bottom of the outer wall of the fixing frame 5 is fixedly installed on the mounting frame 6. The filter tube 2 is movably fitted onto the outer wall of the mounting frame 6, and the filter screen 8 is fixedly installed on the inner wall of the mounting frame 6. A rubber ring 3 is movably fitted onto the outer wall of the valve body 1, and the filter tube 2 is movably fitted onto the outer wall of a rubber pad 19. The rubber pad 19 is in contact with the fixing frame 5. The valve body 1 and the filter tube 2 are connected by threads, and the threads on the outer wall of the valve body 1 and the outer wall of the filter tube 2 have the same specifications.

[0024] Furthermore, valve body 1 provides an installation position for filter tube 2 and rubber ring 3, filter tube 2 provides an installation position for rubber gasket 19, rubber ring 3 is installed between valve body 1 and filter tube 2, filter tube 2 provides an opening position for positioning groove 4, positioning groove 4 provides an installation position for positioning block 7, positioning block 7 provides an installation position for fixing frame 5, fixing frame 5 provides an installation position for mounting frame 6, mounting frame 6 provides an installation position for filter screen 8, and rubber gasket 19 is installed between valve body 1 and fixing frame 5. When installing filter tube 2, rubber ring 3 is fitted onto valve body 1, fixing frame 5 is placed into filter tube 2, positioning block 7 on fixing frame 5 is inserted into positioning groove 4 on filter tube 2, rubber gasket 19 is placed into filter tube 2, rubber gasket 19 is positioned above fixing frame 5, and filter tube 2 is screwed into valve body 1. Rubber ring 3 between filter tube 2 and valve body 1 can play a sealing role to prevent sewage leakage. As filter tube 2 is gradually screwed into valve body 1... As the valve body 1 gradually approaches the rubber pad 19, it compresses the rubber pad 19, which in turn compresses the fixing frame 5. This fixes the fixing frame 5, the mounting frame 6, and the filter screen 8 inside the filter tube 2. Simultaneously, the rubber pad 19 ensures the airtight connection between the valve body 1 and the filter tube 2, further preventing sewage leakage. The fixing of the positioning block 7 via the positioning groove 4 and the compression of the rubber pad 19 and mounting frame 6 by the valve body 1 achieves the installation and fixation of the fixing frame 5, mounting frame 6, and filter screen 8, preventing displacement of the filter screen 8 during sewage filtration. As sewage passes through the filter screen 8, the filter screen 8 filters out large particles of impurities, preventing them from entering the valve body 1. This prevents large particles from entering the valve body 1 and causing wear or blockage to its internal structure, thus affecting the normal function and service life of the backflow preventer. It also prevents large particles from interfering with the normal operation of the backflow preventer, thus preventing sewage from flowing back into the valve body 1.

[0025] Example 2, please refer to Figure 1 , Figure 2 and Figure 3 A backflow preventer is provided, wherein a mounting bracket 9 is movably installed on the inner wall of the filter tube 2, the mounting bracket 9 is movably fitted on the outer wall of the rotating shaft 10, a turbine fan 11 is fixedly installed at the bottom of the outer wall of the rotating shaft 10, a connecting component is fixedly installed at the top of the outer wall of the rotating shaft 10, a connecting rod 13 is fixedly installed at the top of the outer wall of the connecting component, and a cleaning brush 14 is fixedly installed at the top of the outer wall of the connecting rod 13, the cleaning brush 14 being in contact with the filter screen 8; the inner wall of the filter tube 2 is symmetrically provided with mounting grooves 20, the mounting grooves 20 being movably fitted on the outer wall of the mounting bracket 9.

[0026] Furthermore, the filter tube 2 provides an opening position for the mounting groove 20, and the mounting groove 20 provides an installation position for the mounting bracket 9. The mounting bracket 9 is pushed from the bottom of the filter tube 2 into the mounting groove 20. When the mounting bracket 9 cannot be pushed further, it is rotated to fix it inside the filter tube 2. The mounting bracket 9 provides an installation position for the rotating shaft 10, which in turn provides an installation position for the turbine fan 11. The rotating shaft 10 also provides an installation position for the connecting assembly, which provides an installation position for the connecting rod 13. The connecting rod 13 provides an installation position for the cleaning brush 14, which is used to clean the surface of the filter screen 8. When wastewater passes through the filter tube 2, the water flow drives the turbine fan 11 to rotate, and the turbine fan 11 drives the rotating shaft 10. The rotating shaft 10 drives the connecting assembly to rotate, which in turn drives the connecting rod 13 to rotate. The connecting rod 13 then drives the cleaning brush 14 to rotate. During the rotation, the cleaning brush 14 remains in contact with the filter screen 8, scraping away impurities on the filter screen 8 and preventing them from accumulating and clogging. The filter screen 8 filters wastewater, and large particles in the wastewater gradually accumulate on it. When too many impurities accumulate on the surface of the filter screen 8, it can clog it. By using the cleaning brush 14 to continuously scrape away impurities, further accumulation can be prevented, thus avoiding clogging of the filter tube 2. This extends the service life of the filter tube 2 and reduces the need for frequent replacements.

[0027] Example 3, please refer to Figure 3 and Figure 4A backflow preventer includes a connecting rod 13 fixedly mounted on the top of the outer wall of a connecting assembly, and a cleaning brush 14 fixedly mounted on the top of the outer wall of the connecting rod 13, the cleaning brush 14 contacting a filter screen 8; the connecting assembly includes a first connecting block 12, a second connecting block 16, and a compression spring 18, the connecting assembly being used to elastically push the connecting rod 13 and the cleaning brush 14, so that the cleaning brush 14 is in close contact with the filter screen 8; a first connecting block 12 is fixedly mounted on the top of the outer wall of a rotating shaft 10, the first connecting block 12 being movably fitted onto the outer wall of a second connecting block 16, a compression spring 18 fixedly mounted on the top of the inner wall of the first connecting block 12, a second connecting block 16 fixedly mounted on the top of the outer wall of the compression spring 18, and a connecting rod 13 fixedly mounted on the top of the outer wall of the second connecting block 16; limit blocks 17 are symmetrically fixedly mounted on the outer wall of the second connecting block 16, and limit grooves 15 are symmetrically formed on the inner wall of the first connecting block 12, the limit grooves 15 being movably fitted onto the outer wall of the limit blocks 17.

[0028] Furthermore, the rotating shaft 10 provides an installation position for the first connecting block 12, the first connecting block 12 provides a fitting position for the second connecting block 16, the first connecting block 12 provides an installation position for the compression spring 18, the compression spring 18 provides an installation position for the second connecting block 16, the second connecting block 16 provides an installation position for the connecting rod 13, the connecting rod 13 provides an installation position for the cleaning brush 14, the first connecting block 12 provides an opening position for the limiting groove 15, the limiting groove 15 provides a fitting position for the limiting block 17, the limiting block 17 moves within the limiting groove 15, and the limiting groove 15 restricts the movement of the limiting block 17. The movement range of the position block 17 allows the filter screen 8 to provide a contact position for the cleaning brush 14. The compression spring 18 on the first connecting block 12 is in a compressed state. The compression spring 18 elastically pushes the second connecting block 16, the second connecting block 16 pushes the connecting rod 13, and the connecting rod 13 pushes the cleaning brush 14, so that the cleaning brush 14 is always in contact with the filter screen 8. This prevents the cleaning brush 14 from wearing out or shifting due to prolonged use, which would cause the cleaning brush 14 to stop contacting the filter screen 8, thus reducing the cleaning effect of the cleaning brush 14 and leading to the clogging of the filter screen 8.

[0029] Example 4, please refer to Figure 1 , Figure 2 and Figure 3A backflow preventer includes a valve body 1 and a filter tube 2. The filter tube 2 is movably fitted onto the outer wall of the valve body 1. A filter assembly is installed inside the filter tube 2. The filter assembly is used to filter large particulate impurities in sewage flowing into the valve body 1. The filter assembly includes: a positioning groove 4, a fixing frame 5, a mounting frame 6, a positioning block 7, and a filter screen 8. The filter tube 2 is movably fitted onto the fixing frame 5. Positioning blocks 7 are symmetrically fixedly installed on the bottom of the outer wall of the fixing frame 5. The inner wall of the filter tube 2 has a positioning groove 4, which is movably fitted onto the outer wall of the positioning block 7. The bottom of the outer wall of the fixing frame 5 is fixedly installed on the mounting frame 6, and the filter tube 2 is movably fitted onto the outer wall of the mounting frame 6. A filter screen 8 is fixedly installed on the inner wall of the filter tube 2; a mounting bracket 9 is movably installed on the inner wall of the filter tube 2, and the mounting bracket 9 is movably fitted on the outer wall of the rotating shaft 10. A turbine fan 11 is fixedly installed at the bottom of the outer wall of the rotating shaft 10, and a connecting component is fixedly installed at the top of the outer wall of the rotating shaft 10. A connecting rod 13 is fixedly installed at the top of the outer wall of the connecting component, and a cleaning brush 14 is fixedly installed at the top of the outer wall of the connecting rod 13. The cleaning brush 14 is in contact with the filter screen 8; symmetrical mounting grooves 20 are opened on the inner wall of the filter tube 2, and the mounting grooves 20 are movably fitted on the outer wall of the mounting bracket 9; a rubber ring 3 is movably fitted on the outer wall of the valve body 1, and the filter tube 2 is movably fitted on the outer wall of the rubber pad 19. The rubber pad 19 is in contact with the fixing frame 5.

[0030] Furthermore, after the valve body 1 and filter tube 2 have been used for a period of time, during the inspection of the filter tube 2, the staff unscrewed the filter tube 2 from the valve body 1, rotated the mounting bracket 9 inside the filter tube 2 so that the mounting bracket 9 could slide in the mounting groove 20, and then slid the mounting bracket 9 out of the mounting groove 20. The filter screen 8 was pushed upward from the bottom of the filter tube 2. The filter screen 8 moved the mounting frame 6, the mounting frame 6 moved the fixing frame 5, the fixing frame 5 moved the positioning block 7 out of the positioning groove 4, and the fixing frame 5 moved the rubber pad 19, thereby removing the rubber pad 19 and the filter screen 8. The staff checked the wear of each component and cleaned the impurities on each component. After replacing the severely worn components, the components were reinstalled, completing the inspection of the filter tube 2.

[0031] Working principle: When installing filter tube 2, put rubber ring 3 on valve body 1, put fixing frame 5 into filter tube 2, insert positioning block 7 into positioning groove 4, put rubber pad 19 into filter tube 2, and screw filter tube 2 into valve body 1.

[0032] During the use of filter tube 2, filter screen 8 filters large particulate impurities in sewage. When sewage passes through turbine fan 11, the water flow will drive turbine fan 11 to rotate. Turbine fan 11 drives rotating shaft 10, connecting assembly, and connecting rod 13 to rotate. Connecting rod 13 drives cleaning brush 14 to rotate. Cleaning brush 14 scrapes the impurities on filter screen 8 to prevent impurities from accumulating on filter screen 8 and causing filter screen 8 to become clogged.

[0033] The compression spring 18 on the first connecting block 12 in the connecting assembly presses the second connecting block 16, the second connecting block 16 presses the connecting rod 13, and the connecting rod 13 presses the cleaning brush 14, so that the cleaning brush 14 is always in contact with the filter screen 8, avoiding wear or displacement of the cleaning brush 14 due to prolonged use.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A backflow preventer, characterized in that: The device includes a valve body (1) and a filter tube (2). The filter tube (2) is movably fitted on the outer wall of the valve body (1). A filter assembly is installed inside the filter tube (2). The filter assembly is used to filter large particulate impurities in the sewage flowing into the valve body (1). The filter assembly includes: a positioning groove (4), a fixing frame (5), an installation frame (6), a positioning block (7), and a filter screen (8). The filter tube (2) is movably fitted on the fixing frame (5). Positioning blocks (7) are symmetrically fixedly installed on the bottom of the outer wall of the fixing frame (5). The inner wall of the filter tube (2) is provided with a positioning groove (4). The positioning groove (4) is movably fitted on the outer wall of the positioning block (7). An installation frame (6) is fixedly installed on the bottom of the outer wall of the fixing frame (5). The filter tube (2) is movably fitted on the outer wall of the installation frame (6). A filter screen (8) is fixedly installed on the inner wall of the installation frame (6).

2. The backflow preventer according to claim 1, characterized in that: The inner wall of the filter tube (2) is movably fitted with a mounting bracket (9), which is movably fitted onto the outer wall of the rotating shaft (10). A turbine fan (11) is fixedly installed at the bottom of the outer wall of the rotating shaft (10), and a connecting component is fixedly installed at the top of the outer wall of the rotating shaft (10). A connecting rod (13) is fixedly installed at the top of the outer wall of the connecting component, and a cleaning brush (14) is fixedly installed at the top of the outer wall of the connecting rod (13). The cleaning brush (14) is in contact with the filter screen (8).

3. The backflow preventer according to claim 1, characterized in that: The valve body (1) is movably fitted with a rubber ring (3) on its outer wall, and the filter tube (2) is movably fitted on the outer wall of the rubber pad (19). The rubber pad (19) is in contact with the fixed frame (5).

4. A backflow preventer according to claim 2, characterized in that: The connecting assembly includes: a first connecting block (12), a second connecting block (16), and a compression spring (18). The connecting assembly is used to elastically push the connecting rod (13) and the cleaning brush (14) so ​​that the cleaning brush (14) is in close contact with the filter screen (8). The first connecting block (12) is fixedly installed on the top of the outer wall of the rotating shaft (10). The first connecting block (12) is movably fitted on the outer wall of the second connecting block (16). The compression spring (18) is fixedly installed on the top of the inner wall of the first connecting block (12). The second connecting block (16) is fixedly installed on the top of the outer wall of the compression spring (18). The connecting rod (13) is fixedly installed on the top of the outer wall of the second connecting block (16).

5. A backflow preventer according to claim 2, characterized in that: The filter tube (2) has symmetrically provided mounting grooves (20) on its inner wall, and the mounting grooves (20) are movably fitted onto the outer wall of the mounting bracket (9).

6. A backflow preventer according to claim 4, characterized in that: The second connecting block (16) has a symmetrically fixed limit block (17) installed on its outer wall, and the first connecting block (12) has a symmetrically opened limit groove (15) on its inner wall. The limit groove (15) is movably fitted on the outer wall of the limit block (17).

7. A backflow preventer according to claim 1, characterized in that: The valve body (1) and the filter tube (2) are connected by threads, and the outer wall thread of the valve body (1) has the same specification as the outer wall thread of the filter tube (2).

Images