Water return prevention check valve

Abstract

The utility model discloses a water return prevention check valve which comprises a main body unit and a valve body, and the left side and the right side of the valve body are fixedly connected with a water outlet pipe and a water inlet pipe respectively. And the connecting unit comprises a movable connecting pipe, the left end of the outer wall of the movable connecting pipe is fixedly connected with a flange plate, and a driving assembly for controlling the movable connecting pipe to move is arranged above the movable connecting pipe. The screw rod drives the nut to move outwards along the screw rod and drives the movable connecting pipe to move outwards along the water outlet pipe through the sliding strip, the movable connecting pipe drives the sealing ring to move outwards and stretches the telescopic hose, and after the flange plate makes contact with a pipeline at the output end, the flange plate is connected with the pipeline at the output end through the bolt. The movable connecting pipe is retracted through reverse operation, so that the overall length of the check valve at the moment is smaller than an installation gap between the pipelines, the check valve can be installed without twisting the pipelines, installation is convenient, and the pipelines are not prone to deviation.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a water backflow prevention check valve. Background Art

[0002] A check valve is a valve whose opening and closing parts are circular discs and which rely on their own weight and medium pressure to produce movement to block the backflow of the medium. It is an automatic valve that transports the fluid through the pressure difference of the fluid. The opening and closing parts open or close automatically by the force of the medium flow to prevent the backflow of the medium. Therefore, most check valves have the performance of preventing backflow. They are one-way valve structures that automatically open and close by fluid medium. They are often used in one-way pipelines to improve the fluid transportation efficiency and automatically perform flow cut-off control according to the fluid pressure difference.

[0003] Most of the existing anti-backflow check valves are equidistant from the inner sides of the connecting pipes on both sides. Therefore, during installation, one side of the pipe needs to be twisted before the check valve can be placed in the area to be connected, which is inconvenient to install and can easily cause the pipe to deviate. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the above problems existing in the existing anti-backflow check valve, the present utility model is proposed.

[0006] Therefore, the purpose of the utility model is to provide an anti-backflow check valve, which is designed to solve the problem that "most of the existing anti-backflow check valves are of the same length as the inner sides of the connecting pipes on both sides, so during installation, one side of the pipe needs to be twisted before the check valve can be placed in the area to be connected, which is inconvenient to install and easily causes the pipe to deviate."

[0007] In order to solve the above technical problems, the utility model provides the following technical solutions: a water backflow prevention check valve, comprising:

[0008] The main unit comprises a valve body, the left and right sides of the valve body are respectively fixedly connected with a water outlet pipe and a water inlet pipe, and the right end of the outer wall of the water inlet pipe is provided with a connecting flange;

[0009] The connecting unit comprises a movable connecting pipe, which is movably connected to the outer wall of the water outlet pipe, a flange is fixedly connected to the left end of the outer wall of the movable connecting pipe, and a driving component for controlling the movement of the movable connecting pipe is arranged above the movable connecting pipe.

[0010] As a preferred solution of the anti-backflow check valve described in the utility model, the driving assembly includes a nut fixedly connected to the right end of the top of the movable connecting pipe, the internal thread of the nut is connected to a screw rod, the outer wall of the screw rod is provided with a limit plate, a through hole rotatably connected to the screw rod is opened in the middle of the limit plate, and the limit plate is fixedly connected to the top of the water outlet pipe.

[0011] As a preferred solution of the anti-backflow check valve described in the utility model, the top of the flange is fixedly connected with a sleeve whose inner circle diameter is larger than that of the screw, and the left end of the screw is longitudinally aligned with the left end of the outlet pipe.

[0012] As a preferred solution of the anti-backflow check valve described in the utility model, the left end of the inner wall of the movable connecting pipe is fixedly connected with a sealing ring, the right side of the sealing ring is fixedly connected with a telescopic hose, the other end of the telescopic hose is fixedly connected with a fixing ring, and the fixing ring is fixedly connected to the inner wall of the water outlet pipe.

[0013] As a preferred solution of the anti-backflow check valve described in the utility model, the fixing ring and the sealing ring are both made of hard rubber, and the fixing ring prevents the fluid from flowing into the gap between the telescopic hose and the movable connecting pipe.

[0014] As a preferred solution of the anti-backflow check valve described in the utility model, wherein: a plurality of slide bars in a circular array are fixedly connected to the right side of the sealing ring, and the slide bars are fixedly connected to the inner wall of the movable connecting pipe, and the outer wall of the water outlet pipe is provided with a slide groove movably connected to the slide bar.

[0015] Beneficial effects of the utility model:

[0016] When in use, the water inlet pipe is connected to the pipe at the input end through the connecting flange, and the screw is rotated. The screw drives the nut to move outward along the screw, and the nut drives the movable connecting pipe to move outward along the water outlet pipe through the slide bar and gradually approaches the pipe at the output end. The movable connecting pipe drives the sealing ring to move outward and stretch the telescopic hose. After the flange plate contacts the pipe at the output end, the flange plate is connected to the pipe at the output end by bolts. When disassembling, the movable connecting pipe is retracted through the opposite operation, so that the overall length of the check valve at this time is smaller than the installation gap between the pipes. Therefore, the installation of the check valve can be completed without twisting the pipe, which is convenient for installation and not easy to cause pipe deviation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0018] Figure 1 This is a schematic diagram of the overall structure of a backflow prevention check valve proposed by the utility model;

[0019] Figure 2 for Figure 1 Schematic diagram of the internal structure of the water outlet pipe;

[0020] Figure 3 for Figure 2 Schematic diagram of the movable connecting pipe structure.

[0021] In the figure: 100, main unit; 101, valve body; 102, water inlet pipe; 103, water outlet pipe; 200, connecting unit; 201, movable connecting pipe; 201a, sealing ring; 201b, telescopic hose; 201c, fixing ring; 201d, slide bar; 202, flange; 203, driving assembly; 203a, screw; 203b, nut; 203c, limit plate; 204, sleeve. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0025] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0026] Reference Figure 1-3 The utility model provides a backflow prevention check valve, comprising:

[0027] The main unit 100 includes a valve body 101, and the left and right sides of the valve body 101 are respectively fixedly connected with a water outlet pipe 103 and a water inlet pipe 102, and a connecting flange is provided at the right end of the outer wall of the water inlet pipe 102;

[0028] The connecting unit 200 includes a movable connecting pipe 201, which is movably connected to the outer wall of the water outlet pipe 103. A flange 202 is fixedly connected to the left end of the outer wall of the movable connecting pipe 201. A driving component 203 for controlling the movement of the movable connecting pipe 201 is arranged above the movable connecting pipe 201.

[0029] Among them, the driving component 203 includes a nut 203b fixedly connected to the right end of the top of the movable connecting pipe 201, the internal thread of the nut 203b is connected to the screw 203a, the outer wall of the screw 203a is provided with a limiting plate 203c, and the middle of the limiting plate 203c is provided with a through hole rotatably connected to the screw 203a. The limiting plate 203c is fixedly connected to the top of the water outlet pipe 103, and the screw 203a is fixed by the limiting plate 203c. The screw 203a drives the nut 203b to move, thereby driving the movable connecting pipe 201 to move.

[0030] Furthermore, a sleeve 204 having an inner diameter larger than that of the screw 203a is fixedly connected to the top of the flange 202, and the left end of the screw 203a is longitudinally aligned with the left end of the outlet pipe 103. When the flange 202 moves inward, the sleeve 204 prevents the screw 203a from contacting the screw 203a and causing the screw 203a to stop rotating.

[0031] Furthermore, a sealing ring 201a is fixedly connected to the left end of the inner wall of the movable connecting tube 201, a telescopic hose 201b is fixedly connected to the right side of the sealing ring 201a, a fixing ring 201c is fixedly connected to the other end of the telescopic hose 201b, and the fixing ring 201c is fixedly connected to the inner wall of the water outlet pipe 103. The movable connecting tube 201 drives the sealing ring 201a to move outward and stretch the telescopic hose 201b, and the fluid is transported through the telescopic hose 201b.

[0032] Furthermore, the fixing ring 201c and the sealing ring 201a are both made of hard rubber. The fixing ring 201c prevents the fluid from flowing into the gap between the telescopic hose 201b and the movable connecting tube 201, and the sealing ring 201a prevents the gap between the pipeline and the movable connecting tube 201 from causing the fluid to leak out.

[0033] Furthermore, a plurality of slide bars 201d in a circular array are fixedly connected to the right side of the sealing ring 201a, and the slide bars 201d are fixedly connected to the inner wall of the movable connecting tube 201. The outer wall of the water outlet pipe 103 is provided with a slide groove movably connected to the slide bar 201d. The movable connecting tube 201 drives the slide bar 201d to move linearly along the water outlet pipe 103 and provides a limiting effect, thereby preventing the nut 203b and the screw rod 203a from rotating together, causing the movable connecting tube 201 to be unable to move linearly.

[0034] During use, the water inlet pipe 102 is connected to the pipe at the input end through the connecting flange, and the screw 203a is rotated. The screw 203a drives the nut 203b to move outward along the screw 203a, and the nut 203b drives the movable connecting pipe 201 to move outward along the water outlet pipe 103 through the slide bar 201d and gradually approaches the pipe at the output end. The movable connecting pipe 201 drives the sealing ring 201a to move outward and stretch the telescopic hose 201b. After the flange 202 contacts the pipe at the output end, the flange 202 is connected to the pipe at the output end by bolts. When disassembling, the movable connecting pipe 201 is retracted through the opposite operation, so that the overall length of the check valve at this time is smaller than the installation gap between the pipes. Therefore, the installation of the check valve can be completed without twisting the pipe, which is convenient for installation and not easy to cause pipe deviation.

[0035] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A backflow prevention check valve, characterized in that: include: The main unit (100) comprises a valve body (101), the left and right sides of the valve body (101) are respectively fixedly connected with a water outlet pipe (103) and a water inlet pipe (102), and the right end of the outer wall of the water inlet pipe (102) is provided with a connecting flange; The connection unit (200) comprises a movable connection pipe (201), the movable connection pipe (201) being movably connected to the outer wall of the water outlet pipe (103), a flange (202) being fixedly connected to the left end of the outer wall of the movable connection pipe (201), and a driving assembly (203) for controlling the movement of the movable connection pipe (201) being arranged above the movable connection pipe (201); The driving assembly (203) comprises a nut (203b) fixedly connected to the right end of the top of the movable connecting pipe (201); the internal thread of the nut (203b) is connected to the screw rod (203a); the outer wall of the screw rod (203a) is provided with a limit plate (203c); a through hole rotatably connected to the screw rod (203a) is provided in the middle of the limit plate (203c); and the limit plate (203c) is fixedly connected to the top of the water outlet pipe (103).

2. The anti-backflow check valve according to claim 1, characterized in that: A sleeve (204) having an inner diameter greater than that of the screw (203a) is fixedly connected to the top of the flange (202), and the left end of the screw (203a) is longitudinally aligned with the left end of the water outlet pipe (103).

3. The anti-backflow check valve according to claim 2, characterized in that: The left end of the inner wall of the movable connection pipe (201) is fixedly connected to a sealing ring (201a), the right side of the sealing ring (201a) is fixedly connected to a telescopic hose (201b), the other end of the telescopic hose (201b) is fixedly connected to a fixing ring (201c), and the fixing ring (201c) is fixedly connected to the inner wall of the water outlet pipe (103).

4. The anti-backflow check valve according to claim 3, characterized in that: The fixing ring (201c) and the sealing ring (201a) are both made of hard rubber, and the fixing ring (201c) prevents fluid from flowing into the gap between the telescopic hose (201b) and the movable connecting tube (201).

5. The anti-backflow check valve according to claim 4, characterized in that: A plurality of slide bars (201d) in an annular array are fixedly connected to the right side of the sealing ring (201a), and the slide bars (201d) are all fixedly connected to the inner wall of the movable connecting pipe (201), and a slide groove movably connected to the slide bar (201d) is provided on the outer wall of the water outlet pipe (103).

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