Low-resistance backflow preventer capable of preventing backflow pollution

Abstract

The utility model discloses a low-resistance backflow preventer capable of preventing backflow pollution, which relates to the technical field of valves and comprises a main valve pipe, connectors are arranged at two ends of the main valve pipe, a water escape valve is connected to the outer surface of the main valve pipe, a fixing cover is arranged at the top of the main valve pipe, and the fixing cover is fixedly connected with the main valve pipe. Two anti-backflow units are arranged in the main valve pipe, a sealing rubber ring, a guide block and an inserting groove of the equipment are matched with an adjusting block, a limiting spring and a fixing column, the sealing rubber ring can be conveniently and rapidly disassembled and assembled, the stability of installation and fixing is guaranteed after the sealing rubber ring is installed, replacement and maintenance are convenient, and the practicability is high. The installation stability is guaranteed, the failure rate of equipment use is reduced, the fixing ring and the installation block are matched with the installation groove and the fastening screw, the whole fixing ring and the supporting frame can be conveniently disassembled and assembled, the sealing plug can be conveniently maintained and replaced, the backflow prevention effect is guaranteed, and the complexity of replacement and maintenance is reduced.

Description

Technical Field

[0001] The utility model relates to the field of valves, in particular to a low-resistance backflow preventer capable of preventing backflow pollution. Background Art

[0002] Low-resistance backflow preventers can be used in drinking water pipes. When the water supply to the pipe is cut off or blocked, the water in the pipe can be blocked to prevent sewage from flowing back and ensure the safety and health of drinking water. For example, a Chinese patent discloses a low-resistance backflow preventer (Announcement No. CN220354553U). Although the low-resistance backflow preventer can be easily disassembled and assembled, the sealing rubber ring at the sealing structure needs to be replaced in time. The traditional sealing rubber ring is not only inconvenient to replace, but also cannot remain stable after installation and is easy to fall off, thereby affecting the airtightness of the structure and increasing the failure rate of the low-resistance backflow preventer. Utility Model Content

[0003] In view of the deficiencies of the prior art, the utility model provides a low-resistance backflow preventer that can prevent backflow pollution, thereby solving the problems raised by the above-mentioned background technology.

[0004] To achieve the above objectives, the utility model is implemented through the following technical solutions: a low-resistance backflow preventer capable of preventing backflow pollution, comprising a main valve pipe, both ends of the main valve pipe are provided with connectors, the outer surface of the main valve pipe is connected with a drain valve, the top of the main valve pipe is provided with a fixed cover, and the interior of the main valve pipe is provided with two backflow prevention units;

[0005] The backflow prevention unit includes a fixing ring, the inner side wall of the fixing ring is connected to a support frame, the inner side wall of the support frame is connected to a sliding rod, one end of the sliding rod is connected to a closing plug, and the outer surface of the sliding rod and one end surface of the support frame are connected to a reset spring.

[0006] As a further technical solution of the utility model, the outer surface of the sliding rod and one end face of the reset spring are connected with a mounting nut, the outer surface of the fixing ring is annularly connected with four mounting blocks, and the inner wall of the main valve tube and the corresponding positions of the sliding paths of the four mounting blocks are provided with mounting grooves.

[0007] As a further technical solution of the utility model, one end face of the fixed ring is connected to a sealing rubber ring, and one end face of the sealing rubber ring is connected to four guide blocks in a ring shape. The inner side wall of one end of the fixed ring and the corresponding positions of the sliding paths of the four guide blocks are provided with plug-in grooves.

[0008] As a further technical solution of the utility model, the end face of the support frame is provided with two movable grooves in a ring shape, the inner side wall of the movable groove is connected to an adjusting block, one end of the adjusting block is connected to a fixing column, two limit springs are connected to one side of the adjusting block and located on the inner side wall of the movable groove, and fixing holes are provided on the surface of the guide block corresponding to the fixing column.

[0009] As a further technical solution of the utility model, the inner wall of the fixing ring is annular and penetrated by two fastening screws, and matching screw holes are provided at the corresponding positions of the inner wall of the main valve tube and the two fastening screws. The inner diameter of the mounting groove is matched with the sliding path of the mounting block, and the fixing ring is connected to the inner wall of the main valve tube through the mounting block and the fastening screws.

[0010] As a further technical solution of the utility model, a notch is provided on one end face of the fixing ring corresponding to the closing plug, the inner diameter of the supporting frame is matched with the outer diameter of the sliding rod, the inner diameter of the movable groove is matched with the sliding path of the adjusting block, the inner diameter of the plug-in groove is matched with the sliding path of the guide block, and the inner diameter of the fixing hole is matched with the outer diameter of the fixing column.

[0011] The utility model provides a low-resistance backflow preventer that can prevent backflow pollution, which has the following beneficial effects compared with the prior art:

[0012] 1. The low-resistance backflow preventer designed in this invention can prevent backflow pollution. The cooperation between the sealing rubber ring, the guide block, the plug-in slot, the adjustment block, the limit spring and the fixing column can facilitate the rapid disassembly and assembly of the sealing rubber ring, and ensure the stability of the installation and fixation after the sealing rubber ring is installed, which is convenient for replacement and maintenance, ensures the stability of the installation, and reduces the failure rate of the equipment.

[0013] The present invention discloses a low-resistance backflow preventer which can prevent backflow pollution. The cooperation between the fixing ring and the mounting block and the mounting groove and the fastening screw can facilitate the disassembly and assembly of the entire fixing ring and the support frame, and the maintenance and replacement of the closing plug, thereby ensuring the anti-backflow effect and reducing the tediousness of replacement and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a low resistance backflow preventer capable of preventing backflow pollution;

[0015] Figure 2 It is a left side view of a low resistance backflow preventer capable of preventing backflow contamination;

[0016] Figure 3 A low resistance backflow preventer that can prevent backflow contamination Figure 2 AA section view in;

[0017] Figure 4 The present invention is a schematic diagram of the exploded structure of a backflow prevention unit of a low-resistance backflow preventer capable of preventing backflow contamination.

[0018] Figure 5 A low resistance backflow preventer that can prevent backflow contamination Figure 4 Magnified view of A in .

[0019] Figure 6 The present invention is a structural schematic diagram of a fixing ring and a supporting frame of a low-resistance backflow preventer capable of preventing backflow contamination.

[0020] In the figure: 1. main valve pipe; 11. mounting groove; 2. connector; 3. drain valve; 4. fixing cover; 5. anti-backflow unit; 51. fixing ring; 52. support frame; 53. slide rod; 54. closing plug; 55. reset spring; 56. mounting nut; 57. mounting block; 58. sealing rubber ring; 59. guide block; 501. adjusting block; 502. movable groove; 503. fixing column; 504. limit spring; 505. fixing hole; 506. fastening screw; 507. plug-in slot. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-4 The utility model provides a technical solution of a low-resistance backflow preventer which can prevent backflow pollution: it includes a main valve tube 1, both ends of the main valve tube 1 are provided with connectors 2, the outer surface of the main valve tube 1 is connected with a drain valve 3, the top of the main valve tube 1 is provided with a fixed cover 4, and the interior of the main valve tube 1 is provided with two backflow prevention units 5, the backflow prevention unit 5 includes a fixed ring 51, the inner side wall of the fixed ring 51 is connected with a support frame 52, the inner side wall of the support frame 52 is connected with a slide rod 53, one end of the slide rod 53 is connected with a closing plug 54, and the outer surface of the slide rod 53 and one end face of the support frame 52 are connected with a reset spring 55.

[0023] like Figure 1-4As shown, the outer surface of the slide rod 53 and one end surface of the reset spring 55 are connected with a mounting nut 56, and the outer surface of the fixing ring 51 is annularly connected with four mounting blocks 57, and the inner wall of the main valve tube 1 and the corresponding parts of the sliding paths of the four mounting blocks 57 are provided with mounting grooves 11, and the inner wall of the fixing ring 51 is annularly penetrated and connected with two fastening screws 506, and the inner wall of the main valve tube 1 and the corresponding parts of the two fastening screws 506 are provided with matching screw holes, and the inner diameter size of the mounting groove 11 is matched with the sliding path of the mounting block 57, and the fixing ring 51 is connected to the inner wall of the main valve tube 1 through the mounting block 57 and the fastening screws 506. It should be noted that the cooperation between the fixing ring 51 and the mounting block 57 and the mounting groove 11 and the fastening screws 506 can facilitate the disassembly and assembly of the soul of the entire anti-backflow unit 5, thereby facilitating the maintenance and replacement of sealing components such as the closing plug 54 to ensure the sealing effect.

[0024] like Figure 3-6 As shown, one end face of the fixed ring 51 is connected to a sealing rubber ring 58, and one end face of the sealing rubber ring 58 is connected to four guide blocks 59 in an annular shape. The inner side wall of one end of the fixed ring 51 and the corresponding positions of the sliding paths of the four guide blocks 59 are provided with plug-in grooves 507. The end face of the support frame 52 is provided with two movable grooves 502 in an annular shape. The inner side wall of the movable groove 502 is connected to an adjusting block 501. One end of the adjusting block 501 is connected to a fixing column 503. One side face of the adjusting block 501 and the inner side wall of the movable groove 502 are connected to two limit springs 504. The surface of the guide block 59 and the fixing column 503 are provided with fixing holes 505 corresponding to the fixing column 503. One end face of the fixed ring 51 is provided with a sealing plug A slot is provided corresponding to 54, the inner diameter of the support frame 52 is matched with the outer diameter of the slide rod 53, the inner diameter of the movable slot 502 is matched with the sliding path of the adjustment block 501, the inner diameter of the plug-in slot 507 is matched with the sliding path of the guide block 59, and the inner diameter of the fixing hole 505 is matched with the outer diameter of the fixing column 503. It should be noted that the sealing rubber ring 58 can ensure the airtightness of the closure when the closing plug 54 is closed, and the cooperation between the adjusting block 501 and the limit spring 504 and the fixing column 503 and the fixing hole 505 can facilitate the disassembly and assembly of the sealing rubber ring 58, ensure the stability of the installation of the sealing rubber ring 58, and prevent the sealing rubber ring 58 from falling off.

[0025] The working principle of the utility model is as follows: remove the fixing cover 4, then unscrew the two fastening screws 506 from the inner side wall of the fixing ring 51, then slide the fixing ring 51 along the inner side wall of the main valve pipe 1, so that the four mounting blocks 57 on the outer surface of the fixing ring 51 slide along the inner side wall of the mounting groove 11, so that the fixing ring 51 and the mounting blocks 57 are separated from the main valve pipe 1 and the inner side wall of the mounting groove 11, and the backflow prevention unit 5 can be disassembled;

[0026] Slide the two adjustment blocks 501 along the inner wall of the movable groove 502 to squeeze the two limit springs 504, so that the adjustment blocks 501 drive the fixed column 503 to separate from the fixed hole 505 on the surface of the guide block 59. Then, take out the sealing rubber ring 58 from the inner wall of the fixed ring 51, and take out the four guide blocks 59 connected to one end face of the sealing rubber ring 58 from the plug-in groove 507, and then the sealing rubber ring 58 can be replaced.

[0027] The above is only a preferred implementation of the present invention. It should be noted that, for ordinary technicians in the technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A low resistance backflow preventer capable of preventing backflow pollution, characterized in that: It comprises a main valve pipe (1): both ends of the main valve pipe (1) are provided with connectors (2), the outer surface of the main valve pipe (1) is connected with a drain valve (3), the top of the main valve pipe (1) is provided with a fixed cover (4), and the interior of the main valve pipe (1) is provided with two backflow prevention units (5); The backflow prevention unit (5) comprises a fixing ring (51), the inner side wall of the fixing ring (51) is connected to a support frame (52), the inner side wall of the support frame (52) is connected to a sliding rod (53), one end of the sliding rod (53) is connected to a closing plug (54), and the outer surface of the sliding rod (53) and one end surface of the support frame (52) is connected to a return spring (55).

2. A low resistance backflow preventer capable of preventing backflow pollution according to claim 1, characterized in that: The outer surface of the slide rod (53) and one end surface of the return spring (55) are connected to a mounting nut (56), the outer surface of the fixing ring (51) is annularly connected to four mounting blocks (57), and mounting grooves (11) are provided at the inner side wall of the main valve tube (1) and at positions corresponding to the sliding paths of the four mounting blocks (57).

3. A low resistance backflow preventer capable of preventing backflow pollution according to claim 1, characterized in that: One end face of the fixed ring (51) is connected to a sealing rubber ring (58), and one end face of the sealing rubber ring (58) is connected to four guide blocks (59) in an annular shape. An inner side wall of one end of the fixed ring (51) and a corresponding position of the sliding path of the four guide blocks (59) are provided with a plug-in groove (507).

4. A low resistance backflow preventer capable of preventing backflow pollution according to claim 3, characterized in that: The end surface of the support frame (52) is provided with two movable grooves (502) in an annular shape, the inner side wall of the movable groove (502) is connected to an adjustment block (501), one end of the adjustment block (501) is connected to a fixing column (503), one side surface of the adjustment block (501) and located on the inner side wall of the movable groove (502) is connected to two limit springs (504), and the surface of the guide block (59) is provided with fixing holes (505) corresponding to the fixing column (503).

5. A low resistance backflow preventer capable of preventing backflow pollution according to claim 2, characterized in that: The inner wall of the fixing ring (51) is annular and penetrates two fastening screws (506), and matching screw holes are provided at corresponding positions of the inner wall of the main valve tube (1) and the two fastening screws (506). The inner diameter of the mounting groove (11) matches the sliding path of the mounting block (57), and the fixing ring (51) is connected to the inner wall of the main valve tube (1) via the mounting block (57) and the fastening screws (506).

6. A low resistance backflow preventer capable of preventing backflow pollution according to claim 4, characterized in that: One end surface of the fixing ring (51) is provided with a notch corresponding to the closing plug (54); the inner diameter of the supporting frame (52) is matched with the outer diameter of the sliding rod (53); the inner diameter of the movable groove (502) is matched with the sliding path of the adjusting block (501); the inner diameter of the plug-in groove (507) is matched with the sliding path of the guide block (59); and the inner diameter of the fixing hole (505) is matched with the outer diameter of the fixing column (503).

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