A backflow preventer with filtering function

Abstract

The utility model provides a kind of simple structure, with filter function's backflow preventer with filter function, including valve body, water inlet channel and water outlet channel being opened on valve body, filter screen, the filter screen is located in water inlet channel, the water inlet channel is located in the water inlet side of filter screen and is equipped with the water seat that can be supplied to water flow, sliding rod is slidably arranged on the water seat, brush is rotatably arranged on the end of sliding rod, intermittent device is arranged in the valve body, and brush is intermittently resisted water inlet side of filter screen.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a backflow preventer with a filtering function. Background Technology

[0002] With the development of society, pipe connections are needed in both production and daily life. Pipe connections require pipe fittings, among which backflow preventers are one of the most frequently used pipe fittings.

[0003] Chinese Patent Publication No. CN202210167628.5 discloses a backflow preventer with a filtering function. Although it can further enhance the backflow prevention effect of the valve body, impurities can enter the valve body during use, which can then accumulate inside the valve body, block or corrode the valve body, which is not conducive to the long-term use of the backflow preventer.

[0004] To address this problem, this utility model was developed. Utility Model Content

[0005] Therefore, in view of the above problems, this utility model proposes a backflow preventer with a simple structure and a filtering function.

[0006] To solve the above-mentioned technical problems, the solution adopted by this utility model is as follows: a backflow preventer with a filtration function, including a valve body, an inlet channel and an outlet channel opened on the valve body, and a filter screen. The filter screen is disposed in the inlet channel. The inlet channel is provided with a water-passing seat on the water-inlet side of the filter screen, which allows water to flow through. A sliding rod is slidably disposed on the water-passing seat. A brush is rotatably disposed at the end of the sliding rod. An intermittent device is provided in the valve body to cause the brush to intermittently resist the water-inlet side of the filter screen.

[0007] A further improvement is made to the intermittent device, which includes an eccentric wheel, a fixed plate at the end of the sliding rod, a rotating rod rotatably passing through the valve body, one end of the rotating rod being located inside the water inlet channel and the other end being located outside the valve body, the eccentric wheel being located at the end of the rotating rod, and a driving device being provided at the other end of the rotating rod, the eccentric wheel resisting the fixed plate, and a return device for returning the sliding rod to its original position being provided between the fixed plate and the water seat.

[0008] A further improvement is that the return device is a return spring, which is sleeved on the sliding rod. One end of the return spring resists the fixed plate, and the other end of the return spring resists the water-passing seat.

[0009] A further improvement is that: a maintenance channel communicating with the outside is opened on the side of the valve body, a sealing cover is provided on the valve body at the maintenance channel to seal the maintenance channel, a fixing device is provided on the valve body to fix the sealing cover, and a sealing device is also provided between the valve body and the sealing cover.

[0010] A further improvement is that the sealing device includes a sealing ring, a sealing channel is provided around the sealing cover, the sealing ring is slidably disposed in the sealing channel, and a pushing device is provided in the sealing channel to push the sealing ring against the sealing cover.

[0011] A further improvement is that the pushing device consists of a plurality of pushing springs, which are arranged around the sealed channel. One end of the pushing spring is connected to the sealing ring, and the other end of the pushing spring is connected to the inner wall of the sealed channel.

[0012] A further improvement is that the filter screen is bolted to the inner wall of the water inlet channel.

[0013] A further improvement is that a brush is provided at the end of the sliding rod via a rotating motor.

[0014] A further improvement is that the fixing device is a sealing cover that is bolted to the valve body.

[0015] A further improvement is that an annular impurity collection groove is provided on the water inlet side of the filter screen inside the water inlet channel. The impurity collection groove is located between the edge of the filter screen and the inner wall of the water inlet channel. When the brush rotates and washes, its bristle trajectory can cover the surface of the filter screen and sweep the impurities into the impurity collection groove. A drain port is provided at the bottom of the valve body corresponding to the position of the impurity collection groove. The drain port is sealed by a drain valve.

[0016] A further improvement is that the sealing cap is equipped with a handle.

[0017] By adopting the aforementioned technical solution, the beneficial effects of this utility model are: It has a simple structure and a filtration function. When water flows into the inlet channel, it passes through the filter screen, which traps impurities on the inlet side surface, reducing the amount of impurities entering the valve body. This prevents impurities from accumulating in the valve body and clogging it, or adhering to the inner wall and internal parts of the valve body, thus avoiding corrosion. This is beneficial for the long-term use of the valve and reduces the valve's maintenance and replacement rate. Attached Figure Description

[0018] Figure 1 This is a partially cutaway structural diagram of a backflow preventer with a filtering function according to an embodiment of the present invention.

[0019] Figure 2This is an enlarged structural schematic diagram of embodiment A of this utility model. Detailed Implementation

[0020] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0021] refer to Figure 1-2 The present invention discloses a backflow preventer with a filtering function, comprising a valve body 1, an inlet channel 2 and an outlet channel formed on the valve body 1, and a filter screen 3. The filter screen 3 is bolted to the inner wall of the inlet channel 2, and its edge forms an annular impurity collection groove 17 between the inner wall of the channel and the inner wall of the channel. When the brush 6 rotates and brushes, the trajectory of its bristles 6 can cover the surface of the filter screen 3 and sweep impurities into the impurity collection groove 17. The bottom of the valve body 1 is provided with a drain port communicating with the impurity collection groove 17, and a drain valve 18 is installed on the drain port. The inlet channel 2 is provided with a water-passing seat 4 on the water inlet side of the filter screen 3, which allows water to flow through. A sliding rod 5 is slidably provided on the water-passing seat 4. The end of the sliding rod 5 is provided with a brush 6 rotated by a rotating motor. The valve body 1 is provided with an intermittent device that causes the brush 6 to intermittently resist the filter screen 3.

[0022] Specifically, the intermittent device includes an eccentric wheel 9, a fixed plate 7 at the end of the sliding rod 5, a rotating rod 10 rotatably passing through the valve body 1, one end of the rotating rod 10 being located inside the water inlet channel 2, and the other end of the rotating rod 10 being located outside the valve body 1, the eccentric wheel 9 being located at the end of the rotating rod 10, and a drive motor 11 being located at the other end of the rotating rod 10, the eccentric wheel 9 resisting the fixed plate 7, and a return spring 8 for returning the sliding rod 5 to its original position being provided between the fixed plate 7 and the water passage seat 4, the return spring 8 being sleeved on the sliding rod 5, one end of the return spring 8 resisting the fixed plate 7, and the other end of the return spring 8 resisting the water passage seat 4.

[0023] In operation, when water enters the inlet channel 2, it first passes through the filter screen 3. The filter screen 3 traps impurities on its inlet side surface. The drive motor 11 operates intermittently, and through the cooperation of the eccentric wheel 9 and the sliding rod 5, pushes the brush 6 against the surface of the filter screen 3 and performs a rotating brushing motion. The impurities brushed off by the brush 6 are guided and collected in the impurity collection tank 17 by the force of the rotating brush and the action of the water flow. Because the impurity collection tank 17 is located on the side of the main water flow channel and has a large flow cross-section, the water flow rate slows down here, allowing the impurities to settle and be temporarily stored. By periodically opening the drain valve 18, the impurities collected in the impurity collection tank 17 can be discharged outside the valve body with part of the water flow, thereby thoroughly removing the impurities and preventing them from re-attaching or entering the valve body.

[0024] When filter screen 3 is filtering, drive motor 11 rotates, causing rotating rod 10 to rotate. Rotating rod 10 drives eccentric wheel 9 to rotate. Eccentric wheel 9 resists the fixed plate 7, pushing sliding rod 5 to slide. This causes brush 6 to resist filter screen 3. The rotating motor rotates, causing brush 6 to rotate, thus brushing off impurities attached to filter screen 3, improving the filter screen 3's filter life. At this time, return spring 8 is compressed. When drive motor 11 continues to rotate, eccentric wheel 9 continues to rotate, return spring 8 returns to its original position, causing sliding rod 5 to return to its original position, releasing brush 6 from resistance to filter screen 3, allowing water to flow through filter screen 3 more effectively.

[0025] To facilitate cleaning and maintenance of the internal parts of the valve body 1, a maintenance channel communicating with the outside is provided on the side of the valve body 1. A sealing cover 12 is provided on the valve body 1 at the maintenance channel to seal the maintenance channel. The sealing cover 12 is locked to the valve body 1 with bolts. A sealing ring 14 is also provided between the valve body 1 and the sealing cover 12. A sealing channel 16 is provided around the sealing cover 12. The sealing ring 14 is slidably disposed in the sealing channel 16. A plurality of push springs 15 are provided in the sealing channel 16 to push the sealing ring 14 against the sealing cover 12. The push springs 15 are arranged around the sealing channel 16. One end of the push spring 15 is connected to the sealing ring 14, and the other end of the push spring 15 is connected to the inner wall of the sealing channel 16.

[0026] When internal parts need to be replaced, the sealing cover 12 can be removed, and then the valve body 1 can be opened to replace the internal parts, thus avoiding the need to disassemble the valve for replacement. This not only facilitates operation for workers but also benefits the long-term use of the valve. The push spring 15 ensures that the sealing ring 14 is always firmly pressed against the sealing cover 12, thereby guaranteeing a seal between the sealing cover 12 and the valve body 1. This prevents water leakage after the valve body 1 is subjected to vibration, thus improving the sealing performance between the valve body 1 and the sealing cover 12.

[0027] To facilitate the replacement of the filter screen 3, the filter screen 3 is bolted to the inner wall of the water inlet channel 2.

[0028] To facilitate handling the sealing cap 12, a handle 13 is provided on the sealing cap 12.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions above are only illustrative of the principles of this utility model. Various changes and modifications may be made to this utility model without departing from the spirit and scope of this utility model. All such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A backflow preventer with a filtering function, comprising a valve body, an inlet channel and an outlet channel formed on the valve body, characterized in that: It also includes a filter screen, which is located in the water inlet channel. The water inlet channel is provided with a water-passing seat on the water inlet side of the filter screen, which allows water to flow through. A sliding rod is slidably provided on the water-passing seat, and a brush is rotatably provided at the end of the sliding rod. The valve body is provided with an intermittent device that causes the brush to intermittently resist the water inlet side of the filter screen.

2. A backflow preventer with a filtering function according to claim 1, characterized in that: The intermittent device includes an eccentric wheel, a fixed plate at the end of the sliding rod, a rotating rod rotatably passing through the valve body, one end of the rotating rod being located inside the water inlet channel and the other end being located outside the valve body, the eccentric wheel being located at the end of the rotating rod, and a driving device being located at the other end of the rotating rod, the eccentric wheel resisting the fixed plate, and a return device for returning the sliding rod to its original position being provided between the fixed plate and the water seat.

3. A backflow preventer with a filtering function according to claim 2, characterized in that: The return device is a return spring, which is sleeved on the sliding rod. One end of the return spring resists the fixed plate, and the other end of the return spring resists the water-passing seat.

4. A backflow preventer with a filtering function according to claim 1, characterized in that: The valve body has a maintenance channel on its side that connects to the outside. The valve body has a sealing cover at the maintenance channel to seal the maintenance channel. The valve body has a fixing device to fix the sealing cover. A sealing device is also provided between the valve body and the sealing cover.

5. A backflow preventer with a filtering function according to claim 4, characterized in that: The sealing device includes a sealing ring, and a sealing channel is provided around the sealing cover. The sealing ring is slidably disposed in the sealing channel, and a pushing device is provided in the sealing channel to push the sealing ring against the sealing cover.

6. A backflow preventer with a filtering function according to claim 5, characterized in that: The pushing device consists of a plurality of pushing springs, which are arranged around the sealed channel. One end of each pushing spring is connected to a sealing ring, and the other end of each pushing spring is connected to the inner wall of the sealed channel.

7. A backflow preventer with a filtering function according to claim 1, characterized in that: The filter screen is bolted to the inner wall of the water inlet channel.

8. A backflow preventer with a filtering function according to claim 1, characterized in that: The end of the sliding rod is equipped with a brush that is rotated by a rotating motor.

9. A backflow preventer with a filtering function according to claim 4, characterized in that: The fixing device is: the sealing cover is locked onto the valve body by bolts.

10. A backflow preventer with a filtering function according to claim 1, characterized in that: The water inlet channel has an annular impurity collection groove on the water inlet side of the filter screen. The impurity collection groove is located between the edge of the filter screen and the inner wall of the water inlet channel. When the brush rotates and washes, its bristle trajectory can cover the surface of the filter screen and sweep impurities into the impurity collection groove. The bottom of the valve body has a drain port corresponding to the position of the impurity collection groove. The drain port is sealed by a drain valve.

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