Butterfly valve with backflow prevention function

Abstract

The utility model discloses a butterfly valve with a backflow prevention function, which relates to the technical field of butterfly valves and comprises a valve body, flanges are fixedly connected to the outer sides of two ends of the valve body, an inner layer is fixedly connected inside the valve body, a mounting ring is fixedly connected to one end inside the inner layer, and a baffle is rotatably connected to the middle of the upper end of the mounting ring. The side, close to the baffle, of the mounting ring is fixedly connected with two symmetrically-distributed mounting blocks, the end, close to the mounting ring, of the baffle is fixedly connected with two symmetrically-distributed mounting shafts, the baffle is made of foam materials, and the mounting shafts are rotationally connected into the mounting blocks. According to the butterfly valve with the backflow prevention function, when the water flow in the baffle is reduced, torsion springs located at the two ends of the mounting shaft can drive the baffle to rotate in the direction close to the mounting ring at the moment, the mounting ring is closed through the baffle, and then the interior of the inner layer is completely blocked through an overall sealing structure formed by the mounting ring and the baffle; and water flow is prevented from flowing back in the inner layer.

Description

Technical Field

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

[0002] A butterfly valve is a valve used to control the flow of fluid. It is widely used in various industrial piping systems, including water treatment, chemical industry, petroleum, natural gas and other fields.

[0003] During use of the existing butterfly valve, the fluid inside the butterfly valve is prone to backflow, which affects the function of the butterfly valve.

[0004] In order to overcome the above-mentioned defects, a Chinese patent of the prior art (publication number: CN213808936U) discloses a butterfly valve with an anti-backflow function, which is provided with a baffle and a first threaded shaft. This arrangement cooperates with the fixed connection between the rotating handle and the first threaded shaft, the spiral connection between the first threaded shaft and the baffle, the fixed connection between the baffle and the gasket, and the sliding connection between the baffle and the fixed frame. When the device is used, the backflow phenomenon is avoided during the use of the device, thereby ensuring the normal use of the device.

[0005] The above-mentioned existing technology intercepts the fluid to achieve the anti-backflow effect through the fixed connection between the baffle and the gasket and the sliding connection between the baffle and the fixed frame. During actual use, the fluid inside the butterfly valve can easily penetrate into the mechanical parts and cause corrosion. Overly complex parts can easily cause the anti-backflow structure inside the butterfly valve to fail. Utility Model Content

[0006] The purpose of the present utility model is to provide a butterfly valve with a backflow prevention function to solve the problem in the above-mentioned background technology that the fluid inside the butterfly valve easily penetrates into the interior of the mechanical parts and causes corrosion, and overly complex parts easily cause the backflow prevention structure inside the butterfly valve to fail.

[0007] To achieve the above object, the present invention provides the following technical solution: a butterfly valve with a backflow prevention function, comprising a valve body, flanges fixedly connected to the outer sides of both ends of the valve body, and an inner layer fixedly connected to the interior of the valve body;

[0008] One end of the inner layer is fixedly connected to a mounting ring, and the middle of the upper end of the mounting ring is rotatably connected to a baffle, and one side of the mounting ring close to the baffle is fixedly connected to two symmetrically distributed mounting blocks, and one end of the baffle close to the mounting ring is fixedly connected to two symmetrically distributed mounting shafts, and the baffle is made of foam material, the mounting shaft is rotatably connected to the inside of the mounting block, and a torsion spring is fixedly connected between the end of the mounting shaft and the mounting block.

[0009] Preferably, a lower mounting hole is provided at the bottom of the valve body, and an upper mounting hole is provided at the top of the valve body, the lower mounting hole and the upper mounting hole both extend into the inner layer, and the lower mounting hole and the upper mounting hole are aligned with each other.

[0010] Preferably, a mounting sleeve is fixedly connected to the middle of the top of the valve body, and the mounting sleeve is aligned with the top of the upper mounting hole, and a mounting box is fixedly connected to the top of the mounting sleeve.

[0011] Preferably, a butterfly plate is rotatably connected inside the valve body, and the upper and lower ends of the butterfly plate are rotatably connected to the upper mounting hole and the lower mounting hole respectively, and the top of the butterfly plate is fixedly connected to the valve stem.

[0012] Preferably, the butterfly plate is located in the middle of the valve body, and the outer side of the butterfly plate and the inner side of the inner layer are in contact with each other, and the butterfly plate and the inner layer are in contact with each other to form a sealing structure.

[0013] Preferably, a worm gear is fixedly connected to the top of the valve stem, and the valve stem is rotatably connected to the inside of the worm gear, and the worm gear is rotatably connected to the inside of the installation box.

[0014] Preferably, a worm is rotatably connected inside the installation box, and the outer side of the worm is meshed with the outer side of the worm wheel. The end of the worm is fixedly connected to a mounting ring, and the mounting ring is located outside the installation box.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This butterfly valve with backflow prevention function has a structure in which, when the water flow inside the baffle decreases, the torsion springs at both ends of the mounting shaft will drive the baffle to rotate toward the mounting ring, causing the baffle to close the mounting ring. The integral sealing structure formed by the mounting ring and the baffle completely blocks the inner layer, preventing water from flowing back inside the inner layer.

[0017] Furthermore, when the butterfly plate and the inner layer are not distributed vertically, a gap will be formed between the inner side of the inner layer and the butterfly plate. When the inner layer and the butterfly plate form a parallel structure, the butterfly valve will be in a fully open state, and the worm and the worm wheel have self-locking properties, so that the rotation angle of the butterfly plate inside the valve body can be locked by itself to prevent the water flow from impacting the butterfly plate and causing it to rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of the valve body of the utility model;

[0020] Figure 3 This is a schematic diagram of the butterfly plate structure of the utility model;

[0021] Figure 4 This is a schematic diagram of the valve body structure of the utility model;

[0022] Figure 5 This is a schematic diagram of the baffle structure of the utility model;

[0023] Figure 6 This is a schematic diagram of the installation shaft structure of the utility model.

[0024] In the figure: 1. Valve body; 2. Flange; 3. Inner layer; 4. Lower mounting hole; 5. Upper mounting hole; 6. Mounting sleeve; 7. Mounting box; 8. Butterfly plate; 9. Valve stem; 10. Worm gear; 11. Worm; 12. Mounting ring; 13. Baffle; 14. Mounting block; 15. Mounting shaft; 16. Torsion spring. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] Example 1: Please refer to Figure 1 - Figure 6 , the utility model provides the following technical solutions:

[0027] A butterfly valve with a backflow prevention function comprises a valve body 1, flanges 2 are fixedly connected to the outer sides of both ends of the valve body 1, and an inner layer 3 is fixedly connected to the inside of the valve body 1;

[0028] A mounting ring 12 is fixedly connected to one end of the inner layer 3, and a baffle 13 is rotatably connected to the middle of the upper end of the mounting ring 12. Two symmetrically distributed mounting blocks 14 are fixedly connected to one side of the mounting ring 12 close to the baffle 13, and two symmetrically distributed mounting shafts 15 are fixedly connected to one end of the baffle 13 close to the mounting ring 12, and the baffle 13 is made of foam material. The mounting shaft 15 is rotatably connected to the inside of the mounting block 14, and a torsion spring 16 is fixedly connected between the end of the mounting shaft 15 and the mounting block 14.

[0029] A lower mounting hole 4 is provided at the bottom of the valve body 1 , and an upper mounting hole 5 is provided at the top of the valve body 1 . Both the lower mounting hole 4 and the upper mounting hole 5 extend into the inner layer 3 , and the lower mounting hole 4 and the upper mounting hole 5 are aligned with each other.

[0030] A mounting sleeve 6 is fixedly connected to the middle of the top of the valve body 1 , and the mounting sleeve 6 is aligned with the top of the upper mounting hole 5 , and a mounting box 7 is fixedly connected to the top of the mounting sleeve 6 .

[0031] A butterfly plate 8 is rotatably connected inside the valve body 1 , and the upper and lower ends of the butterfly plate 8 are rotatably connected to the upper mounting hole 5 and the lower mounting hole 4 respectively, and a valve stem 9 is fixedly connected to the top of the butterfly plate 8 .

[0032] The butterfly plate 8 is located in the middle of the valve body 1, and the outer side of the butterfly plate 8 is in contact with the inner side of the inner layer 3, and the butterfly plate 8 and the inner layer 3 are in contact with each other to form a sealing structure.

[0033] A worm gear 10 is fixedly connected to the top of the valve stem 9 , and the valve stem 9 is rotatably connected to the inside of the worm gear 10 , and the worm gear 10 is rotatably connected to the inside of the installation box 7 .

[0034] A worm 11 is rotatably connected inside the mounting box 7 , and the outer side of the worm 11 is meshed with the outer side of the worm wheel 10 . A mounting ring 12 is fixedly connected to the end of the worm 11 , and the mounting ring 12 is located outside the mounting box 7 .

[0035] Example 2: Based on Example 1, its specific working principle is as follows:

[0036] This butterfly valve with backflow prevention function is first installed in the water pipe line through the flange 2, so that water enters the inner layer 3 from the end of the valve body 1 away from the mounting ring 12, flows through the inner layer 3, and then flows out of the valve body 1 through the mounting ring 12, while maintaining the flow direction of the water. By rotating the mounting ring 12, the butterfly plate 8 is controlled to rotate inside the inner layer 3, thereby controlling the opening and closing of the butterfly valve;

[0037] When water flows inside the inner layer 3, the worm 11 is driven to rotate inside the mounting box 7 by rotating the mounting ring 12, and the worm gear 10 is driven to rotate inside the mounting box 7 by the rotation of the worm 11. The worm gear 10 will drive the valve stem 9 to rotate inside the mounting sleeve 6, so that the butterfly plate 8 rotates inside the valve body 1 and the inner layer 3. When the butterfly plate 8 and the inner layer 3 are in a vertical distribution state, the outer side of the butterfly plate 8 will fit with the inner side of the inner layer 3, and the butterfly plate 8 will fit with the inner side of the inner layer 3 to form a sealing structure, thereby sealing the inner layer 3. At this time, the butterfly valve will be in a closed state, and when the butterfly plate 8 and the inner layer 3 are not in a vertical distribution state, a gap will be formed between the inner side of the inner layer 3 and the butterfly plate 8. When the inner layer 3 and the butterfly plate 8 form a parallel structure, the butterfly valve will be in a fully open state, and the worm 11 and the worm gear 10 have self-locking properties, so that the rotation angle of the butterfly plate 8 inside the valve body 1 can be automatically locked to prevent the water flow from impacting the butterfly plate 8 and causing it to rotate;

[0038] When the water flows inside the inner layer 3, the water will flow inside the mounting ring 12. When the butterfly plate 8 is closed, the butterfly plate 8 gradually rotates inside the valve body 1 to a state perpendicular to the valve body 1, and the gap between the inner side of the inner layer 3 and the outer side of the butterfly plate 8 will gradually decrease until the butterfly plate 8 is completely closed. In the process of the gap between the inner side of the inner layer 3 and the outer side of the butterfly plate 8 decreasing, the water inside it tends to flow in the opposite direction of the flow direction, resulting in a backflow phenomenon in the inner layer 3. During the flow inside the inner layer 3, the water will pass through the baffle 13. , the water flow will lift up the mounting block 14, causing the baffle 13 to rotate around the two mounting blocks 14 on one side of the mounting ring 12 through the mounting shaft 15 at its top. At this time, a passage will be formed inside the mounting ring 12. When the water flow inside the baffle 13 decreases, the torsion springs 16 located at both ends of the mounting shaft 15 will drive the baffle 13 to rotate toward the mounting ring 12, so that the baffle 13 closes the mounting ring 12, and then the overall sealing structure formed by the mounting ring 12 and the baffle 13 completely blocks the inside of the inner layer 3, preventing water from flowing back inside the inner layer 3.

[0039] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0040] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A butterfly valve with a backflow prevention function, comprising a valve body (1), wherein flanges (2) are fixedly connected to the outer sides of both ends of the valve body (1), and an inner layer (3) is fixedly connected to the interior of the valve body (1); Its characteristics are: One end of the inner layer (3) is fixedly connected to a mounting ring (12), and a baffle (13) is rotatably connected to the middle of the upper end of the mounting ring (12). Two symmetrically distributed mounting blocks (14) are fixedly connected to one side of the mounting ring (12) close to the baffle (13), and two symmetrically distributed mounting shafts (15) are fixedly connected to one end of the baffle (13) close to the mounting ring (12). The baffle (13) is made of foam material, and the mounting shaft (15) is rotatably connected to the inside of the mounting block (14). A torsion spring (16) is fixedly connected between the end of the mounting shaft (15) and the mounting block (14).

2. A butterfly valve with backflow prevention function according to claim 1, characterized in that: The bottom of the valve body (1) is provided with a lower mounting hole (4), and the top of the valve body (1) is provided with an upper mounting hole (5), the lower mounting hole (4) and the upper mounting hole (5) both extend into the interior of the inner layer (3), and the lower mounting hole (4) and the upper mounting hole (5) are aligned with each other.

3. A butterfly valve with backflow prevention function according to claim 2, characterized in that: A mounting sleeve (6) is fixedly connected to the middle of the top of the valve body (1), and the mounting sleeve (6) is aligned with the top of the upper mounting hole (5), and a mounting box (7) is fixedly connected to the top of the mounting sleeve (6).

4. The butterfly valve with backflow prevention function according to claim 3, characterized in that: The valve body (1) is internally rotatably connected to a butterfly plate (8), and the upper and lower ends of the butterfly plate (8) are rotatably connected to the interior of the upper mounting hole (5) and the lower mounting hole (4), respectively, and the top of the butterfly plate (8) is fixedly connected to a valve stem (9).

5. The butterfly valve with backflow prevention function according to claim 4, characterized in that: The butterfly plate (8) is located in the middle of the valve body (1), and the outer side of the butterfly plate (8) and the inner side of the inner layer (3) are in contact with each other, and the butterfly plate (8) and the inner layer (3) are in contact with each other to form a sealing structure.

6. The butterfly valve with backflow prevention function according to claim 5, characterized in that: The top of the valve stem (9) is fixedly connected to a worm gear (10), and the valve stem (9) is rotatably connected to the inside of the worm gear (10), and the worm gear (10) is rotatably connected to the inside of the installation box (7).

7. The butterfly valve with backflow prevention function according to claim 6, characterized in that: A worm (11) is rotatably connected inside the installation box (7), and the outer side of the worm (11) is meshed with the outer side of the worm wheel (10). A mounting ring (12) is fixedly connected to the end of the worm (11), and the mounting ring (12) is located outside the installation box (7).

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