Drainer for backflow preventer

Abstract

The utility model relates to the technical field of backflow preventers, in particular to a drainer for a backflow preventer, which comprises a barrel, a limit ring is welded on the inner side of the barrel, a connecting column is sleeved in the limit ring, a rubber plug is glued at one end of the connecting column, and a sealing plate is glued at one end of the connecting column far away from the rubber plug. And a limiting sleeve is embedded in the connecting column, a compression spring is arranged in the limiting sleeve, an inner threaded sleeve is welded to one end of the barrel, a long screw rod is arranged in the inner threaded sleeve in a penetrating and sleeving mode, and a limiting plate is fixed to one end of the long screw rod through a bolt. The long screw is rotated to push the limiting plate to move through the inner threaded sleeve, the limiting plate moves to push the compression spring, the compression spring applies pressure to the rubber plug, the pressure needed when the rubber plug moves towards the limiting ring is changed, and the purpose of adjusting the pollution discharge pressure is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of backflow preventers, and particularly relates to a drain for a backflow preventer. Background Technique

[0002] A backflow preventer is a device that uses check components to prevent the backflow of water in a water supply pipeline. Its function is to prevent the backflow of the medium in the pipeline under any working conditions to achieve the purpose of avoiding backflow pollution. The backflow preventer is composed of two independent spring-assisted closing elastic sealing check valves and an independent hydraulic differential drain valve in the intermediate pressure reducing chamber.

[0003] Patent Publication No. CN216428422U discloses a drain for a backflow preventer, which includes a middle cavity housing. An inlet and an outlet are respectively fixedly connected to the left and right sides of the middle cavity housing. A drain pipe is fixedly connected to the bottom of the middle cavity housing. An upper cavity housing is fixedly connected to the top of the middle cavity housing. A connecting pipe is fixedly connected to the left side of the upper cavity housing. A top plate is fixedly connected to the top of the upper cavity housing. A sealing valve structure is arranged inside the middle cavity housing and the upper cavity housing. The sealing valve structure includes a rotating groove, which is opened inside the middle cavity housing and the upper cavity housing. Through the setting of the sealing valve structure, the sealing valve structure can close the inlet and the connecting pipe, and then remove the top plate to replace the elastic column. During the replacement process, due to the existence of the sealing valve structure, no medium will enter the upper cavity and the middle cavity, and there is no need to remove the drain for replacement, achieving the effect of more convenient replacement.

[0004] The existing drain for a backflow preventer has no adjustment structure and cannot adjust the sewage discharge pressure according to the sewage backflow pressure. Therefore, a drain for a backflow preventer is proposed. Rotating the long screw rod pushes the limiting plate to move, compresses the compression spring, and presses the rubber plug through the compression spring, so as to adjust the sewage discharge pressure. Content of the Utility Model

[0005] Aiming at the problems in the prior art, the utility model provides a drain for a backflow preventer. Rotating the long screw rod pushes the limiting plate to move, compresses the compression spring, and presses the rubber plug through the compression spring, so as to adjust the sewage discharge pressure.

[0006] The technical solution adopted by the utility model to solve its technical problems is a drain for a backflow preventer, which includes a cylinder body. A limiting ring is welded inside the cylinder body. A connecting column is sleeved inside the limiting ring. One end of the connecting column is glued with a rubber plug, and the end of the connecting column away from the rubber plug is glued with a sealing plate.

[0007] A limiting sleeve is embedded inside the connecting column, a compression spring is arranged inside the limiting sleeve, an internal thread sleeve is welded to one end of the cylinder body, a long screw rod is sleeved through the internal thread sleeve, and a limiting plate is fixed to one end of the long screw rod by bolts.

[0008] By adopting the above technical scheme, the sealing plate and the rubber plug are separated inside the cylinder body. The rubber plug seals the sewage inlet pipe and the sewage discharge pipe. Rotating the long screw rod pushes the limiting plate to move through the internal thread sleeve, squeezes the compression spring, and changes the pressure applied by the compression spring on the rubber plug.

[0009] Specifically, one end of the limiting sleeve penetrates through the sealing plate, and the limiting plate is located inside the limiting sleeve.

[0010] Specifically, a first sealing sleeve is embedded at one side end of the limiting sleeve on the side of the sealing plate, and the long screw rod penetrates through the first sealing sleeve.

[0011] Specifically, a second sealing sleeve is sleeved at one end of the internal thread sleeve, and the long screw rod penetrates through the second sealing sleeve.

[0012] Specifically, a water inlet pipe is welded to one end of the top of the cylinder body, a sewage inlet pipe is welded to the end of the top of the cylinder body far from the water inlet pipe, and a sewage discharge pipe is welded to one end of the bottom of the cylinder body.

[0013] Specifically, a toughened glass window is fixed to one side of the cylinder body by bolts.

[0014] Advantages of the present utility model:

[0015] For the drainer for a backflow preventer of the present utility model, rotating the long screw rod pushes the limiting plate to move through the internal thread sleeve. The movement of the limiting plate pushes the compression spring, and the compression spring applies pressure to the rubber plug, changing the pressure required for the rubber plug to move towards the limiting ring, achieving the purpose of adjusting the sewage discharge pressure.

[0016] For the drainer for a backflow preventer of the present utility model, when clear water flows into the backflow preventer, it can flow into the cylinder body through the water inlet pipe. The clear water entering the cylinder body pushes the sealing plate, pushing the sealing plate to one side of the limiting ring. Coupled with the push of the compression spring, the rubber plug moves towards the inside of the cylinder body between the sewage inlet pipe and the sewage discharge pipe, sealing the sewage inlet pipe and the sewage discharge pipe. When the pressure in the sewage backflow preventer is greater than that of the clear water, it flows into the cylinder body through the sewage inlet pipe, pushing the rubber plug to move and stick tightly to one side of the limiting ring, enabling the sewage entering the cylinder body to be discharged through the sewage discharge pipe. Description of the drawings

[0017] The present utility model will be further described below with reference to the drawings and embodiments.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0019] Figure 2 Schematic diagram of the internal structure of the cylinder body of the present utility model;

[0020] Figure 3 Schematic diagram of the rubber plug and the sealing plate structure of the present utility model;

[0021] In the figure: 1, cylinder body; 2, limit ring; 3, connecting column; 4, rubber plug; 5, sealing plate; 6, limit sleeve; 7, internal thread sleeve; 8, long screw; 9, limit plate; 10, compression spring; 11, first sealing sleeve; 12, second sealing sleeve; 13, water inlet pipe; 14, sewage inlet pipe; 15, sewage discharge pipe; 16, tempered glass viewing window. Specific embodiments

[0022] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0023] Rotate the long screw to push the limit plate to move, squeeze the compression spring, and apply pressure to the rubber plug through the compression spring, so as to adjust the sewage discharge pressure. As Figures 1-3 shown, a drain for a backflow preventer according to the present utility model includes a cylinder body 1, a limit ring 2 is welded inside the cylinder body 1, a connecting column 3 is sleeved inside the limit ring 2, one end of the connecting column 3 is glued with a rubber plug 4, and the end of the connecting column 3 away from the rubber plug 4 is glued with a sealing plate 5;

[0024] A limit sleeve 6 is embedded inside the connecting column 3, a compression spring 10 is arranged inside the limit sleeve 6, an internal thread sleeve 7 is welded at one end of the cylinder body 1, a long screw 8 is sleeved through the inside of the internal thread sleeve 7, and a limit plate 9 is fixed at one end of the long screw 8 by a bolt.

[0025] During use, the sealing plate 5 and the rubber plug 4 are separated inside the cylinder body 1, the rubber plug 4 blocks the sewage inlet pipe 14 and the sewage discharge pipe 15, rotate the long screw 8 to push the limit plate 9 to move through the internal thread sleeve 7, squeeze the compression spring 10, and change the pressure applied by the compression spring 10 on the rubber plug 4.

[0026] Exemplarily, as Figure 2 shown, the present utility model further includes that one end of the limit sleeve 6 penetrates through the sealing plate 5, and the limit plate 9 is located inside the limit sleeve 6.

[0027] During use, one end of the limit sleeve 6 penetrates through the sealing plate 5, which is convenient for one end of the long screw 8 to be inserted into it.

[0028] Exemplarily, as Figure 2As shown, the utility model further includes that a first sealing sleeve 11 is embedded at one end of the limiting sleeve 6 on one side of the sealing plate 5, and the long screw rod 8 penetrates through the first sealing sleeve 11.

[0029] During use, the first sealing sleeve 11 seals between the limiting sleeve 6 and the long screw rod 8.

[0030] Exemplarily, as Figure 3 shown, the utility model further includes that a second sealing sleeve 12 is sleeved at one end of the internal thread sleeve 7, and the long screw rod 8 penetrates through the second sealing sleeve 12.

[0031] During use, the second sealing sleeve 12 seals between the internal thread sleeve 7 and the long screw rod 8.

[0032] Exemplarily, as Figure 1 shown, the utility model further includes that a water inlet pipe 13 is welded to one end of the top of the cylinder body 1, a sewage inlet pipe 14 is welded to the top of the cylinder body 1 away from the water inlet pipe 13, and a sewage discharge pipe 15 is welded to one end of the bottom of the cylinder body 1.

[0033] During use, clear water flows into the cylinder body 1 through the water inlet pipe 13, sewage flows into the cylinder body 1 through the sewage inlet pipe 14, and the sewage in the cylinder body 1 is discharged through the sewage discharge pipe 15.

[0034] Exemplarily, as Figure 1 shown, the utility model further includes that a toughened glass window 16 is fixed to one side of the cylinder body 1 by bolts.

[0035] During use, the setting of the toughened glass window 16 facilitates personnel to observe the situation inside the cylinder body 1.

[0036] When the utility model is in use, personnel use bolts to fix the water inlet pipe 13 and the sewage inlet pipe 14 at the bottom of the backflow preventer;

[0037] When clear water flows into the backflow preventer, it can flow into the cylinder body 1 through the water inlet pipe 13. The clear water entering the cylinder body 1 pushes the sealing plate 5, pushing the sealing plate 5 to one side of the limiting ring 2. With the push of the compression spring 10, the rubber plug 4 moves towards the inside of the cylinder body 1 between the sewage inlet pipe 14 and the sewage discharge pipe 15 to block the sewage inlet pipe 14 and the sewage discharge pipe 15;

[0038] When the pressure of the sewage in the backflow preventer is greater than that of the clear water, it flows into the cylinder body 1 through the sewage inlet pipe 14, pushing the rubber plug 4 to move and stick tightly to one side of the limiting ring 2, so that the sewage entering the cylinder body 1 can be discharged through the sewage discharge pipe 15;

[0039] The operator rotates the long screw rod 8 to push the limit plate 9 to move through the internal thread sleeve 7. The movement of the limit plate 9 pushes the compression spring 10, and the compression spring 10 applies pressure to the rubber plug 4, changing the pressure required for the rubber plug 4 to move towards the limit ring 2, so as to achieve the purpose of adjusting the sewage discharge pressure.

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of protection required by the present invention. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A drain for a backflow preventer, characterized in that, It includes a cylinder body (1), a limiting ring (2) is welded inside the cylinder body (1), a connecting column (3) is sleeved inside the limiting ring (2), a rubber plug (4) is glued to one end of the connecting column (3), and a sealing plate (5) is glued to the end of the connecting column (3) away from the rubber plug (4); A limiting sleeve (6) is embedded inside the connecting column (3), a compression spring (10) is arranged inside the limiting sleeve (6), an internal thread sleeve (7) is welded to one end of the cylinder body (1), a long screw rod (8) is sleeved through the internal thread sleeve (7), and a limiting plate (9) is fixed to one end of the long screw rod (8) by a bolt.

2. The drain for a backflow preventer according to claim 1, characterized in that, One end of the limiting sleeve (6) penetrates through the sealing plate (5), and the limiting plate (9) is located inside the limiting sleeve (6).

3. The drain for the backflow preventer according to claim 1, characterized in that, A first sealing sleeve (11) is embedded at one end of the limiting sleeve (6) on the side of the sealing plate (5), and the long screw rod (8) penetrates through the first sealing sleeve (11).

4. The drainer for the backflow preventer according to claim 1, wherein, A second sealing sleeve (12) is sleeved at one end of the internal thread sleeve (7), and the long screw rod (8) penetrates through the second sealing sleeve (12).

5. The drain for a backflow preventer according to claim 1, characterized in that, A water inlet pipe (13) is welded to one end at the top of the cylinder body (1), a sewage inlet pipe (14) is welded to the end at the top of the cylinder body (1) away from the water inlet pipe (13), and a sewage discharge pipe (15) is welded to one end at the bottom of the cylinder body (1).

6. The drain for the backflow preventer according to claim 1, characterized in that, A tempered glass window (16) is fixed to one side of the cylinder body (1) by bolts.

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