Backflow prevention stop valve

Abstract

The utility model relates to the technical field of stop valves, in particular to an anti-backflow stop valve. The anti-backflow stop valve comprises a valve body, an integrally-formed flow guide inner container is arranged in the valve body, a plunger used for blocking water is installed in the flow guide inner container, a floating ball is hung at the bottom of the plunger, and a detection component is arranged in the plunger. According to the anti-backflow stop valve, when backflow occurs, fluid downwards impacts the floating ball, so that the floating ball is tightly attached to the liquid inlet of the flow guide inner container, a reverse flow channel is directly blocked, the limiting ring above the liquid inlet of the flow guide inner container can limit the maximum descending position of the floating ball, it is ensured that the sealing position is accurate, and the situation that the floating ball excessively moves downwards to cause sealing failure is avoided; a tension sensor in the detection part is connected with the floating ball through a spring and a piston column, the change of tension borne by the floating ball can be sensed in real time, and when the tension value exceeds a preset early warning value, the tension sensor triggers an audible and visual alarm to give an alarm, so that workers can conveniently and timely troubleshoot, and accident expansion is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of stop valves, in particular to an anti-backflow stop valve. Background Art

[0002] As a key component in fluid control systems, globe valves are widely used in fields such as water supply and drainage, chemical engineering, and HVAC. Their core function is to control the flow of fluids through the movement of opening and closing components (such as plungers). With the increasing demand for industrial automation and safety, backflow prevention has become a crucial additional requirement for globe valves. For example, in the event of a system pressure anomaly (e.g., downstream pressure is higher than upstream), reverse flow must be prevented to avoid media contamination, equipment damage, or system failure.

[0003] Existing anti-backflow stop valves mostly adopt a one-way valve structure (such as a combination of a check valve and a stop valve), but they have obvious limitations: first, the sealing performance of the one-way valve depends on the precise fit between the valve core and the valve seat. The integrated structure is complex and assembled from multiple detachable parts. It is not only inconvenient to install and maintain, but may also affect the overall stability due to assembly errors; second, there is a lack of real-time monitoring capability for backflow phenomena. It is often discovered only after the backflow causes losses, and timely warning is impossible.

[0004] Therefore, it is necessary to provide a new anti-backflow stop valve to solve the above-mentioned technical problems. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides an anti-backflow stop valve.

[0006] The anti-backflow stop valve provided by the utility model comprises a valve body, wherein an integrally formed flow guide liner is provided in the valve body, and a plunger for blocking water is installed in the flow guide liner, and a liquid inlet pipe and a liquid discharge pipe are fixedly installed on both sides of the valve body respectively;

[0007] A float is hung at the bottom of the plunger, and a detection component for detecting the backflow water pressure of the valve body is installed in the installation cavity provided in the plunger. The detection component includes a tension sensor, which is fixedly mounted on the inner top wall of the installation cavity, and a spring is fixedly hung in the detection area of ​​the tension sensor. A piston column is installed at the bottom of the spring, and the piston column passes through the piston hole opened at the bottom of the installation cavity and is installed with a steel wire rope for hanging the float.

[0008] Preferably, both upper and lower ends of the piston column are fixedly installed with abutment plates, the abutment plate above the piston column is located in the installation cavity and fixedly connected to the spring, and the abutment plate below the piston column is located below the plunger and fixedly connected to the wire rope.

[0009] Preferably, the liquid inlet pipe is connected to the liquid inlet of the guide liner, the liquid discharge pipe is connected to the liquid discharge port of the guide liner, and the liquid discharge port and the liquid inlet of the guide liner are distributed vertically.

[0010] Preferably, a limiting ring is fixedly embedded above the liquid inlet of the guide liner.

[0011] Preferably, an audible and visual alarm electrically connected to the tension sensor is installed on the valve body.

[0012] Preferably, a valve cover is fixedly mounted on the valve body, and a threaded valve stem is inserted into the valve cover, the bottom of the valve stem is connected to the connecting end of the plunger, and a handwheel is fixedly mounted on the top of the valve stem.

[0013] Preferably, the liquid inlet pipe and the liquid discharge pipe are both provided with reinforcing ribs fixedly connected to the valve body.

[0014] Preferably, the ball diameter of the float is the same as the inner diameter of the guide liner.

[0015] Compared with the related art, the anti-backflow stop valve provided by the utility model has the following beneficial effects:

[0016] 1. When backflow occurs, the fluid impacts the float downward, making it fit closely to the liquid inlet of the guide liner, directly blocking the reverse flow channel. In addition, the limit ring above the liquid inlet of the guide liner can limit the maximum descending position of the float, ensuring the accurate sealing position and avoiding excessive downward movement of the float, which may cause sealing failure.

[0017] 2. The tension sensor in the detection component of the utility model is connected to the float through a spring and a piston column, and can sense the changes in the tension on the float in real time. When the tension value exceeds the preset warning value, the tension sensor triggers the sound and light alarm to issue a warning, which is convenient for staff to check the fault in time and avoid the expansion of the accident. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of a preferred embodiment of the anti-backflow stop valve provided by the utility model;

[0019] Figure 2 for Figure 1 The internal structure diagram of the valve body is shown in cross section;

[0020] Figure 3 for Figure 2 The schematic structural diagram of the valve body cross section is shown;

[0021] Figure 4 for Figure 2 The structural diagram of the detection component shown;

[0022] Figure 5 for Figure 2 The diagram of the float ball when the valve body is empty is shown;

[0023] Figure 6 for Figure 2 The diagram of the float ball when water enters the valve body inlet pipe is shown;

[0024] Figure 7 for Figure 2 The diagram shows the float when water enters the valve body drain pipe.

[0025] Numbers in the figure: 1. Valve body; 11. Reinforcement rib; 2. Guide liner; 21. Limiting ring; 3. Liquid inlet pipe; 4. Liquid discharge pipe; 5. Plunger; 5a. Mounting cavity; 5b. Piston hole; 51. Valve stem; 52. Handwheel; 6. Float; 7. Wire rope; 8. Detection component; 81. Tension sensor; 82. Spring; 83. Piston column; 84. Abutment disk; 9. Sound and light alarm. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0028] See also Figures 1 to 7 An embodiment of the present invention provides a backflow prevention stop valve, which includes a valve body 1, a plunger 5, a float 6 and a detection component 8.

[0029] In the embodiments of the present invention, please refer to Figure 1 and Figure 3 An integrally formed guide liner 2 is provided in the valve body 1, and a plunger 5 for sealing water is installed in the guide liner 2. A valve cover is fixedly installed on the valve body 1, and a threaded valve stem 51 is inserted in the valve cover. The bottom of the valve stem 51 is connected to the connecting end of the plunger 5, and a handwheel 52 is fixedly installed on the top of the valve stem 51. A liquid inlet pipe 3 and a liquid discharge pipe 4 are fixedly installed on both sides of the valve body 1. The liquid inlet pipe 3 is communicated with the liquid inlet of the guide liner 2, and the liquid discharge pipe 4 is communicated with the liquid discharge port of the guide liner 2, and the liquid discharge port and the liquid inlet of the guide liner 2 are distributed up and down.

[0030] It should be noted that: the water enters the guide liner 2 through the liquid inlet pipe 3, and then enters the drain pipe 4 from the guide liner 2 to be discharged. The rotating handwheel 52 drives the plunger 5 to slide down to the drain port of the guide liner 2 so that the plunger 5 seals it, thereby completing the closing of the stop valve.

[0031] Furthermore, reinforcing ribs 11 fixedly connected to the valve body 1 are installed on the liquid inlet pipe 3 and the liquid discharge pipe 4, thereby improving the firmness of the liquid inlet pipe 3 and the liquid discharge pipe 4.

[0032] In the embodiments of the present invention, please refer to Figures 1 to 7 A float 6 is hoisted at the bottom of the plunger 5, and a detection component 8 for detecting the backflow water pressure of the valve body 1 is installed in the installation cavity 5a provided in the plunger 5. The detection component 8 includes a tension sensor 81, which is fixedly mounted on the inner top wall of the installation cavity 5a. An audible and visual alarm 9 electrically connected to the tension sensor 81 is installed on the valve body 1. A spring 82 is fixedly hoisted in the detection area of ​​the tension sensor 81, and a piston column 83 is installed at the bottom of the spring 82. The piston column 83 passes through the piston hole 5b opened at the bottom of the installation cavity 5a and is installed with a wire rope 7 for hoisting the float 6.

[0033] Among them, the upper and lower ends of the piston column 83 are fixedly installed with abutment plates 84, the abutment plate 84 above the piston column 83 is located in the installation cavity 5a and is fixedly connected to the spring 82, and the abutment plate 84 below the piston column 83 is located below the plunger 5 and is fixedly connected to the wire rope 7, and the ball diameter of the float 6 is the same as the inner diameter of the guide liner 2, and a limit ring 21 is fixedly embedded above the liquid inlet of the guide liner 2.

[0034] It should be noted that when the stop valve is in a waterless state, the spring 82 is slightly stretched by the gravity of the float 6 (see attached Figure 5 shown);

[0035] When the stop valve is opened, the hand wheel 52 is rotated to drive the plunger 5 to slide to the highest point of the guide liner 2. At this time, the drainage port of the guide liner 2 is opened. When water enters the guide liner 2 from the liquid inlet pipe 3, the water volume in the guide liner 2 increases, thereby driving the float 6 to float up until the float 6 is higher than the drainage port of the guide liner 2 (that is, the float 6 is higher than the lowest cavity of the drainage port). The water enters the drainage port of the guide liner 2 into the drainage pipe 4 and is discharged from the drainage pipe 4 (as shown in the attached figure). Figure 6 shown);

[0036] When the stop valve flows back, the water enters the guide liner 2 from the drain pipe 4, and the water impacts the float 6 downward. Since the ball diameter of the float 6 is the same as the inner diameter of the guide liner 2, the sealing of the liquid inlet of the guide liner 2 is achieved, and the anti-backflow of the stop valve is effectively achieved. When the amount of backflow water is large, the float 6 pulls down the piston column 83 through the wire rope 7, thereby driving the spring 83 to stretch. At this time, the tension sensor 81 detects the tension value, and the warning value is set on the tension sensor 81 in advance. When the value received by the tension sensor 81 exceeds the warning value, the sound and light alarm 9 issues a warning, thereby prompting the staff to maintain the stop valve in time (as shown in the attached figure). Figure 7 shown).

[0037] In this embodiment, the limiting ring 21 is located above the liquid inlet of the guide liner 2 , so the maximum descending height of the float 6 is to abut against the top of the limiting ring 21 .

[0038] In addition, the piston column 83 passes through the piston hole 5b and is slidably connected to the piston hole 5b, thereby achieving the purpose of sealing the piston hole 5b, thereby preventing water from overflowing into the installation cavity 5a.

[0039] Among them, a detachable filter (such as a metal filter) is added at the pipe openings of the liquid inlet pipe 3 and the liquid discharge pipe 4 to pre-filter particulate impurities in the fluid and reduce the impact of impurities on the float 6. At the same time, the surface of the float 6 is treated with a polytetrafluoroethylene coating to improve wear resistance and smoothness and reduce impurity adhesion.

[0040] The working principle of the anti-backflow stop valve provided by the utility model is as follows:

[0041] The float 6 is used in conjunction with the guide liner 2 to achieve a physical seal. During normal circulation, fluid enters the guide liner 2 from the liquid inlet pipe 3. As the liquid level rises, the float 6 naturally floats up (higher than the discharge port of the guide liner 2) under the action of buoyancy, thus not obstructing the fluid channel. Since the diameter of the float 6 is the same as the inner diameter of the guide liner 2, when backflow occurs (fluid enters the guide liner 2 from the discharge pipe 4), the fluid impacts the float 6 downward, causing it to fit tightly against the liquid inlet of the guide liner 2, directly blocking the reverse flow channel. In addition, the limit ring 21 above the liquid inlet of the guide liner 2 can limit the maximum descent position of the float 6, ensuring a precise sealing position and preventing the float 6 from moving too far downward, which may cause the seal to fail.

[0042] The tension sensor 81 in the detection component 8 is connected to the float 6 through the spring 82 and the piston column 83, and can sense the changes in the tension on the float 6 in real time (during normal circulation, the float 6 floats up and the tension decreases; during backflow, the float 6 is pulled down by the impact and the tension increases). When the tension value exceeds the preset warning value, the tension sensor 81 triggers the sound and light alarm 9 to issue a warning, which makes it easier for staff to check the fault in time and avoid the expansion of the accident.

[0043] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0044] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A backflow prevention stop valve, comprising a valve body (1), wherein an integrally formed flow guide liner (2) is provided in the valve body (1), and a plunger (5) for blocking water is installed in the flow guide liner (2), and a liquid inlet pipe (3) and a liquid discharge pipe (4) are fixedly installed on both sides of the valve body (1); Its characteristics are: A float (6) is suspended at the bottom of the plunger (5), and a detection component (8) for detecting the backflow water pressure of the valve body (1) is installed in the installation cavity (5a) provided in the plunger (5). The detection component (8) includes a tension sensor (81). The tension sensor (81) is fixedly installed on the inner top wall of the installation cavity (5a), and a spring (82) is fixedly suspended in the detection area of ​​the tension sensor (81). A piston column (83) is installed at the bottom of the spring (82), and the piston column (83) passes through a piston hole (5b) opened at the bottom of the installation cavity (5a) and is installed with a steel wire rope (7) for hanging the float (6).

2. The backflow prevention stop valve according to claim 1, characterized in that: The piston column (83) is fixedly provided with abutment discs (84) at both upper and lower ends. The abutment disc (84) above the piston column (83) is located in the installation cavity (5a) and is fixedly connected to the spring (82), and the abutment disc (84) below the piston column (83) is located below the plunger (5) and is fixedly connected to the wire rope (7).

3. The backflow prevention stop valve according to claim 2, characterized in that: The liquid inlet pipe (3) is in communication with the liquid inlet of the guide liner (2), the liquid discharge pipe (4) is in communication with the liquid discharge port of the guide liner (2), and the liquid discharge port and the liquid inlet of the guide liner (2) are distributed vertically.

4. The backflow prevention stop valve according to claim 1, characterized in that: A limiting ring (21) is fixedly embedded above the liquid inlet of the guide liner (2).

5. The backflow prevention stop valve according to claim 1, characterized in that: The valve body (1) is provided with an audible and visual alarm (9) electrically connected to the tension sensor (81).

6. The backflow prevention stop valve according to claim 1, characterized in that: A valve cover is fixedly mounted on the valve body (1), and a threaded valve stem (51) is inserted into the valve cover. The bottom of the valve stem (51) is connected to the connecting end of the plunger (5), and a hand wheel (52) is fixedly mounted on the top of the valve stem (51).

7. The backflow prevention stop valve according to claim 6, characterized in that: The liquid inlet pipe (3) and the liquid discharge pipe (4) are both provided with reinforcing ribs (11) fixedly connected to the valve body (1).

8. The backflow prevention stop valve according to claim 1, characterized in that: The ball diameter of the float (6) is the same as the inner diameter of the guide liner (2).

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