Anti-reflux device

Abstract

The utility model relates to the technical field of connecting pipelines, and provides an anti-backflow device which comprises a pipe body, an access cover and a baffle, a flow channel is arranged in the pipe body, an access hole is formed in the peripheral side of the pipe body, and the access hole is communicated with the flow channel; the access cover comprises a cover plate and a fixing frame, and the cover plate abuts against the pipe body in a sealed mode and blocks the access hole; the fixing frame is fixedly arranged on the cover plate and connected with the pipe body in a clamped mode. The baffle is rotationally arranged in the flow channel and selectively blocks the flow channel. According to the anti-reflux device, the cover plate and the fixing frame are arranged, and the fixing frame is matched with the pipe body in a clamping manner, so that the cover plate can be quickly disassembled and assembled by utilizing the clamping and separation of the fixing frame and the pipe body, and the maintenance efficiency of the anti-reflux device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of connecting pipelines, in particular to a backflow prevention device. Background Art

[0002] Anti-backflow devices are widely used in water supply, drainage and gas pipeline systems to prevent the conveying medium from backflowing. During the use of anti-backflow devices, there is a problem of loss of anti-backflow function due to impurity adhesion and other reasons. Therefore, it is necessary to open an inspection port on the side of the anti-backflow device to inspect the inside of the anti-backflow device.

[0003] The invention patent with the patent publication number CN103925395B discloses an energy-saving resistance-free check valve, including a valve body, a valve disc and a valve cover. A valve stem is arranged in the valve body, the axial direction of the valve stem is perpendicular to the axial direction of the medium inlet, the valve stem passes through the upper part of the valve cavity, and the two ends of the valve stem extend to the front and rear sides of the valve body respectively. A rotating pair is arranged between the valve stem and the valve body, a rocker is connected to one side of the valve disc, the upper end of the rocker is connected to the valve stem, a limit device is connected to the bottom side of the valve cover, and a hydraulic slow closing device is arranged on the front and rear sides of the valve body. The invention uses gravity and buoyancy to make the valve body pass the medium without resistance at full diameter when the valve disc is fully opened, thereby improving the working efficiency of the water pump and reducing power consumption, thereby achieving energy-saving effect; the valve body adopts a streamlined shape, and the medium will not be deposited in the valve cavity, which is suitable for conveying medium with easy particle deposition; it can effectively reduce water hammer during the closing process, and reduce the damage of water hammer to pipelines and valve equipment; it can ensure sealing when the return water pressure is very low, and can effectively prevent the conveying medium from flowing back when closing quickly.

[0004] In the above technical solution, in order to be able to inspect the inside of the check valve, a valve cover is set on the side of the valve body. However, the valve cover is fixed to the valve body by bolts and nuts, which makes the disassembly and assembly of the valve cover inconvenient and is not conducive to improving the maintenance efficiency of the device. Utility Model Content

[0005] In view of this, the utility model proposes a backflow prevention device, which can quickly disassemble and assemble the inspection cover, which is beneficial to improving the inspection efficiency of the backflow prevention device.

[0006] The technical solution of the utility model is implemented as follows: The utility model provides a backflow prevention device, including a pipe body, an inspection cover and a baffle, wherein:

[0007] The pipe body is provided with a flow channel, and an inspection port is opened on the peripheral side thereof, and the inspection port is connected with the flow channel;

[0008] The inspection cover comprises a cover plate and a fixing frame, wherein the cover plate is sealed against the tube body and blocks the inspection port; the fixing frame is fixedly arranged on the cover plate and is clamped with the tube body;

[0009] The baffle is rotatably disposed in the flow channel and selectively blocks the flow channel.

[0010] On the basis of the above technical solution, preferably, a card slot is provided on the inner wall of the inspection port;

[0011] The fixing frame includes a fixing belt and a latch, wherein:

[0012] One end of the fixing belt is fixedly arranged on the cover plate, and the fixing belt is made of elastic material;

[0013] The clamping tongue is fixedly arranged on one side of the fixing belt and is clamped with the clamping slot.

[0014] More preferably, the card slot, the fixing belt and the card tongue are each provided with two and correspond one to one;

[0015] The two card slots, the two fixing belts and the two card tongues are symmetrically arranged about the center line of the cover plate.

[0016] More preferably, the fixing frame further comprises a connecting belt, wherein the connecting belt is fixedly arranged between the two fixing belts, the connecting belt is made of an elastic material, and when the connecting belt moves in a direction away from the cover plate, the latch tongue is separated from the latch slot.

[0017] More preferably, the fixing belt is perpendicular to the cover plate, and the distance between the connecting belt and the cover plate gradually decreases along the direction from the center point of the connecting belt to the two ends of the connecting belt.

[0018] On the basis of the above technical solution, preferably, the pipe body includes a first pipe and a second pipe, and the flow channel includes a first flow channel and a second flow channel, wherein:

[0019] The second pipeline is fixedly connected to the first pipeline;

[0020] The first flow channel is disposed in the first pipe;

[0021] The second flow channel is disposed in the second pipe and is connected to the first flow channel;

[0022] The upper end of the baffle is rotatably arranged at one end of the first pipe close to the second pipe, and abuts against one end of the first pipe close to the second pipe to block the first flow channel, and the baffle is movably arranged in the second flow channel.

[0023] More preferably, the bottom side in the first flow channel is higher than the bottom side in the second flow channel;

[0024] A gap is provided between the bottom end of the baffle and the bottom side of the second flow channel.

[0025] More preferably, the tube body also includes a third pipe, which is located outside the first pipe, coaxial with it and spaced apart, and one end of the third pipe close to the second pipe is sealed and fixedly connected to the first pipe or the second pipe.

[0026] More preferably, the outer sides of the second pipe and the third pipe are both provided with fixing grooves for clamping with the connecting hoop.

[0027] More preferably, a sink is provided at one end of the first pipe away from the second pipe, one end of the second pipe away from the first pipe, and one end of the third pipe away from the second pipe.

[0028] The anti-backflow device of the utility model has the following beneficial effects compared with the prior art:

[0029] (1) By providing a cover plate and a fixing frame, and allowing the fixing frame to engage with the pipe body, the cover plate can be quickly disassembled and assembled by engaging and separating the fixing frame and the pipe body, thereby improving the maintenance efficiency of the anti-backflow device;

[0030] (2) By providing a connecting belt, two fixing belts and two latches, the cover plate can be removed from the tube body by pulling the connecting belt, thereby improving the convenience of removing the cover plate;

[0031] (3) By providing a third pipeline, the anti-backflow device can be adapted to pipe system joints of different specifications. By providing a fixing groove and a sinking groove, the connection sealing performance between the anti-backflow device and the pipe system can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a cross-sectional view of an inspection port in a backflow prevention device of the utility model;

[0034] Figure 2 This is an exploded view of an anti-backflow device of the utility model;

[0035] Figure 3 It is a partial front view of an inspection cover in a backflow prevention device of the utility model;

[0036] Figure 4 It is a cross-sectional view of a backflow prevention device of the utility model;

[0037] Figure 5 This is a three-dimensional diagram of the first pipeline of a backflow prevention device of the utility model.

[0038] Among them: 1. pipe body; 11. first pipeline; 12. second pipeline; 13. third pipeline; 101. flow channel; 1011. first flow channel; 1012. second flow channel; 102. inspection port; 103. slot; 104. fixing slot; 105. sink; 2. inspection cover; 21. cover plate; 22. fixing frame; 221. fixing belt; 222. tongue; 223. connecting belt; 3. baffle. DETAILED DESCRIPTION

[0039] The following will be combined with the specific implementation of the utility model to clearly and completely describe the technical solution in the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] like Figure 1-5 As shown, a backflow prevention device of the utility model comprises a pipe body 1, an inspection cover 2 and a baffle 3.

[0041] Among them, the pipe body 1 is the main frame of the anti-backflow device, which is used to be connected with the pipeline system. A flow channel 101 is provided in the pipe body 1, and the medium in the pipeline system is transmitted and transported through the flow channel 101. An inspection port 102 is opened on the peripheral side of the pipe body 1, and the inspection port 102 is connected with the flow channel 101, and the interior of the pipe body 1 is inspected through the inspection port 102.

[0042] The inspection cover 2 is used to seal the inspection port 102 when the anti-backflow device is in use. The inspection cover 2 includes a cover plate 21 and a fixing frame 22, wherein the cover plate 21 is sealed against the tube body 1 and seals the inspection port 102; the fixing frame 22 is fixedly arranged on the cover plate 21 and is clamped with the tube body 1; by utilizing the clamping connection between the fixing frame 22 and the tube body 1, the fixing frame 22 and the tube body 1 can be quickly fixed and quickly separated, thereby speeding up the disassembly and assembly efficiency of the cover plate 21 and the tube body 1, which helps to improve the inspection and maintenance efficiency of the anti-backflow device.

[0043] The baffle 3 is used to realize the backflow prevention function. The baffle 3 is rotatably arranged in the flow channel 101 and selectively blocks it. Figure 4As shown, when the medium flows from left to right in the flow channel 101, the baffle 3 can be pushed to rotate to allow the medium to pass through. When the medium flows from right to left in the flow channel 101, the baffle 3 and the tube body 1 are supported to prevent the medium from passing through the flow channel 101, thereby achieving an anti-backflow effect.

[0044] like Figure 2 As shown, a slot 103 is provided on the inner wall of the inspection port 102; Figure 3 As shown, the fixing frame 22 includes a fixing belt 221, a latching tongue 222 and a connecting belt 223, wherein one end of the fixing belt 221 is fixedly arranged on the cover plate 21 and is made of elastic material; the latching tongue 222 is fixedly arranged on one side of the fixing belt 221 and is engaged with the latching groove 103, as shown in FIG. Figure 1 As shown, the cover plate 21 and the tube body 1 are fixed by the engagement of the latch tongue 222 and the latch groove 103, thereby blocking the inspection port 102. When the fixing belt 221 is bent, the latch tongue 222 can be separated from the latch groove 103, thereby realizing the quick disassembly of the cover plate 21.

[0045] In order to improve the fixing strength of the fixing frame 22 and the tube body 1, two slots 103, two fixing belts 221 and two tongues 222 are provided, and they correspond to each other, and the two slots 103, two fixing belts 221 and two tongues 222 are symmetrically arranged about the center line of the cover plate 21.

[0046] like Figure 1 As shown, the connecting belt 223 is fixedly arranged between the two fixing belts 221. The connecting belt 223 is made of elastic material. When the connecting belt 223 is pulled, the connecting belt 223 can be bent so that when the connecting belt 223 moves in a direction away from the cover plate 21, the tongue 222 can be separated from the card slot 103; specifically, the fixing belt 221 is perpendicular to the cover plate 21, and the distance between the connecting belt 223 and the cover plate 21 gradually decreases from the center point of the connecting belt 223 to the two ends of the connecting belt 223, as shown in FIG. Figure 1 As shown, when the connecting belt 223 is pulled upward, the fixing belts 221 on both sides can be bent toward the connecting belt 223 at the same time, so that the two latching tongues 222 can be separated from the two latching slots 103 at the same time, so as to improve the disassembly convenience of the cover plate 21.

[0047] like Figure 4As shown, the pipe body 1 includes a first pipe 11, a second pipe 12 and a third pipe 13, and the flow channel 101 includes a first flow channel 1011 and a second flow channel 1012, wherein the second pipe 12 is fixedly connected to the first pipe 11, and the two are butted to achieve mutual communication; the first flow channel 1011 is arranged in the first pipe 11; the second flow channel 1012 is arranged in the second pipe 12 and is connected to the first flow channel 1011; the upper end of the baffle 3 is rotatably arranged at one end of the first pipe 11 close to the second pipe 12, and is in contact with one end of the first pipe 11 close to the second pipe 12 to block the first flow channel 1011, and the baffle 3 is movably arranged in the second flow channel 1012, that is, it can rotate in the second flow channel 1012; as shown Figure 4 As shown, since the baffle 3 abuts against the right end of the first pipe 11, the medium in the first flow channel 1011 can flow into the second flow channel 1012, while the medium in the second flow channel 1012 cannot flow into the first flow channel 1011, thereby achieving an anti-backflow effect.

[0048] like Figure 4 As shown, in order to allow all the medium in the first flow channel 1011 to flow into the second flow channel 1012 without any accumulation, the bottom side of the first flow channel 1011 is higher than the bottom side of the second flow channel 1012; at the same time, a gap is set between the bottom end of the baffle 3 and the bottom side of the second flow channel 1012 to reduce the impact of the medium in the second flow channel 1012 on the baffle 3.

[0049] The third pipe 13 is located outside the first pipe 11, coaxially therewith and spaced apart, and one end of the third pipe 13 close to the second pipe 12 is sealed and fixedly connected to the first pipe 11 or the second pipe 12. When the backflow prevention device is connected to the pipeline system, the pipeline system can be connected to the first pipe 11 or to the third pipe 13, thereby improving the specification adaptability range of the backflow device.

[0050] After the anti-backflow device is connected to the pipeline system, the connection position needs to be sealed. The commonly used method is to cover the outside of the connection position of the two with a sealing film and use a connecting clamp to fix the sealing film. The outside of the second pipe 12 and the third pipe 13 are both provided with a fixing groove 104 for clamping with the connecting clamp. The clamping fit between the connecting clamp and the fixing groove 104 can prevent it from shaking, thereby ensuring the connection sealing of the anti-backflow device.

[0051] When the backflow prevention device is connected to the pipeline system, it is preferred that the pipeline connector of the pipeline system is inserted into the first pipeline 11, the second pipeline 12 or the third pipeline 13. Figure 5As shown, a sink 105 is provided at one end of the first pipe 11 away from the second pipe 12, one end of the second pipe 12 away from the first pipe 11, and one end of the third pipe 13 away from the second pipe 12. The pipe joint of the pipeline system is abutted against the inner end of the sink 105, thereby improving the connection sealing between the anti-backflow device and the pipeline system.

[0052] A method of using the backflow prevention device of the utility model is as follows:

[0053] like Figure 1 As shown, by pulling the fixing frame 22 upward, the fixing frame 22 can be separated from the tube body 1, thereby driving the cover plate 21 to separate from the tube body 1 to expose the inspection port 102 for inspection or maintenance operations inside the anti-backflow device; when the inspection or maintenance operations inside the anti-backflow device are completed, the cover plate 21 is snapped into the inspection port 102, and the cover plate 21 is pressed to engage the tongue 222 with the slot 103.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A backflow prevention device, characterized in that: It comprises a pipe body (1), an inspection cover (2) and a baffle (3), wherein: A flow channel (101) is provided in the pipe body (1), and an inspection port (102) is provided on the peripheral side of the pipe body, and the inspection port (102) is connected to the flow channel (101); The inspection cover (2) comprises a cover plate (21) and a fixing frame (22), wherein the cover plate (21) is sealed against the tube body (1) and blocks the inspection opening (102); the fixing frame (22) is fixedly arranged on the cover plate (21) and is clamped with the tube body (1); The baffle (3) is rotatably disposed in the flow channel (101) and selectively blocks the flow channel.

2. A backflow prevention device according to claim 1, characterized in that: A slot (103) is provided on the inner wall of the inspection opening (102); The fixing frame (22) comprises a fixing belt (221) and a latching tongue (222), wherein: One end of the fixing belt (221) is fixedly arranged on the cover plate (21), and is made of elastic material; The latch tongue (222) is fixedly arranged on one side of the fixing belt (221) and is latched with the latch slot (103).

3. A backflow prevention device according to claim 2, characterized in that: The card slot (103), the fixing belt (221) and the card tongue (222) are each provided with two and correspond one to one; The two clamping slots (103), the two fixing belts (221) and the two clamping tongues (222) are symmetrically arranged about the center line of the cover plate (21).

4. A backflow prevention device as claimed in claim 3, characterized in that: The fixing frame (22) further comprises a connecting belt (223), wherein the connecting belt (223) is fixedly arranged between the two fixing belts (221), and the connecting belt (223) is made of an elastic material, and when the connecting belt (223) moves in a direction away from the cover plate (21), the latching tongue (222) is separated from the latching slot (103).

5. A backflow prevention device according to claim 4, characterized in that: The fixing belt (221) is perpendicular to the cover plate (21), and the distance between the connecting belt (223) and the cover plate (21) gradually decreases along the direction from the center point of the connecting belt (223) to the two ends of the connecting belt (223).

6. The backflow prevention device according to claim 1, characterized in that: The pipe body (1) comprises a first pipe (11) and a second pipe (12); the flow channel (101) comprises a first flow channel (1011) and a second flow channel (1012); wherein: The second pipeline (12) is fixedly connected to the first pipeline (11); The first flow channel (1011) is arranged in the first pipe (11); The second flow channel (1012) is disposed in the second pipe (12) and is connected to the first flow channel (1011); The upper end of the baffle (3) is rotatably arranged at one end of the first pipe (11) close to the second pipe (12), and is in contact with one end of the first pipe (11) close to the second pipe (12) to block the first flow channel (1011), and the baffle (3) is movably arranged in the second flow channel (1012).

7. A backflow prevention device according to claim 6, characterized in that: The bottom side of the first flow channel (1011) is higher than the bottom side of the second flow channel (1012); A gap is provided between the bottom end of the baffle (3) and the bottom side of the second flow channel (1012).

8. A backflow prevention device according to claim 7, characterized in that: The pipe body (1) further comprises a third pipe (13), the third pipe (13) being located outside the first pipe (11), being coaxial with the first pipe (11) and being arranged at a distance therefrom, and one end of the third pipe (13) close to the second pipe (12) is sealed and fixedly connected to the first pipe (11) or the second pipe (12).

9. A backflow prevention device according to claim 8, characterized in that: The outer sides of the second pipe (12) and the third pipe (13) are both provided with fixing grooves (104) for clamping with the connecting clamps.

10. The backflow prevention device according to claim 9, characterized in that: A sink (105) is provided at one end of the first pipe (11) away from the second pipe (12), one end of the second pipe (12) away from the first pipe (11), and one end of the third pipe (13) away from the second pipe (12).

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