Negative-pressure-resistant pinch valve

Abstract

The utility model relates to a negative pressure resistant pinch valve, which belongs to the technical field of pinch valves, and comprises an electric actuating mechanism and a shell, the electric actuating mechanism drives a main shaft to rotate in the shell, the main shaft is provided with internal and external rectangular threads, and the main shaft comprises an inner shaft with left-hand threads and an outer shaft with right-hand internal threads. The outer shaft is connected with the lower clamping plate through a connecting rod and a movable rod, the inner shaft is connected with the upper clamping plate, and an opening and closing mechanism used for adjusting the pipe clamping valve element is arranged between the upper clamping plate and the lower clamping plate. The purpose of opening and closing the valve is achieved, the problem that the pinch valve is vertically installed and cannot be normally used due to negative pressure is solved, the application range of the pinch valve is widened, the service life of the valve lining is prolonged by two times, and economic benefits are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of negative pressure resistant pinch valve, belong to pinch valve technical field. BACKGROUND

[0002] Pinch valve working principle: fluid passes through pinch valve equipped with valve lining, mechanical external force is applied to the outer surface of valve lining, when external force is greater than valve lining tension and liquid internal pressure, inner lining is flattened, when external force disappears, valve lining relies on fluid pressure and valve lining inner tension, valve lining automatically restores, reach valve gate loosening state, play the purpose of adjusting fluid flow. The valve lining of existing pinch valve is compressed to deform by mechanical external force, when loosening, valve lining is forced to open by fluid pressure and valve lining inner tension. When valve gate is vertically installed, when the vertical height difference between valve gate outlet and valve gate is more than 10m, fluid can generate siphon phenomenon, inner lining negative pressure is less than-0.1MPa, valve lining can appear high-frequency flutter, cause valve lining to be damaged prematurely, because fluid generates siphon phenomenon, siphon and valve lining generate force, while inner valve lining inner tension and liquid pressure force it to restore, two forces contend frequently, finally form resonance, cavitation phenomenon is generated at resonance point, rapidly damage valve lining, seriously affect service life, therefore existing pinch valve cannot meet the market with negative pressure occasion, urgently needs a kind of negative pressure resistant pinch valve to meet market demand. SUMMARY

[0003] The utility model provides a kind of negative pressure resistant pinch valve in view of the deficiency existing in the prior art above.

[0004] The technical scheme that the utility model solves the above technical problem is as follows:

[0005] A kind of negative pressure resistant pinch valve, including electric actuator and shell, electric actuator drives main shaft to rotate in shell, main shaft is with inner and outer rectangular thread, main shaft includes left-hand thread inner shaft and right-hand thread outer shaft, outer shaft is connected with lower clamping plate by connecting rod and moving rod, inner shaft is connected with upper clamping plate, the opening and closing mechanism for adjusting pinch valve core is arranged between the upper clamping plate and lower clamping plate.

[0006] Further, the opening and closing mechanism includes the slide bar fixedly connected with the upper and lower ends of pinch valve core, the upper and lower ends of slide bar opening and closing end are respectively connected with upper clamping plate and lower clamping plate, and the hinge end of slide bar is hinged with the upper and lower ends of shell.

[0007] Further, the opening and closing end of slide bar is equipped with U opening, and U opening is slidably connected with upper clamping plate and lower clamping plate respectively.

[0008] Further, slide shaft slidably connected with U opening is arranged on the upper clamping plate and lower clamping plate.

[0009] Further, the hinge end of slide bar is hinged with shell by pin shaft.

[0010] Furthermore, the clamp valve core is fixedly connected to the slide rod by several fabric straps.

[0011] Furthermore, the number of curtain straps is two, and they are located at the opening and closing end and the hinge end of the slide rod, respectively.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This application adds an opening and closing mechanism to the valve body. The upper and lower clamping plates drive the sliding rods at the upper and lower ends to move, and the sliding rods drive the clamp valve core to move, so as to realize the purpose of opening and closing the valve. This solves the problem that the clamp valve cannot be used normally when it is installed vertically and there is negative pressure. It broadens the application range of the clamp valve, extends the service life of the valve liner, and doubles the service life of the valve liner of the same specification, thus improving economic efficiency. Attached Figure Description

[0013] Figure 1 This is a side view of the structure of the present invention in its open and closed state.

[0014] Figure 2 This is a side view of the closed structure of this utility model.

[0015] Figure 3 This is the main view of the existing technology.

[0016] Figure 4 This is a side view of the prior art.

[0017] In the diagram, 1 is the electric actuator; 2 is the main shaft; 3 is the outer shaft; 4 is the upper clamping plate; 5 is the clamping valve core; 6 is the connecting rod; 7 is the lower clamping plate; 8 is the housing; 9 is the moving rod; 10 is the inner shaft; 11 is the slide rod; 12 is the pin; 13 is the curtain cable tie; and 14 is the slide shaft. Detailed Implementation

[0018] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0019] like Figures 1-2As shown, a negative pressure resistant pinch valve includes an electric actuator 1 and a housing 8. The electric actuator 1 drives a main shaft 2 to rotate inside the housing 8. The main shaft 2 has internal and external rectangular threads. The main shaft 2 includes an inner shaft 10 with a left-hand thread and an outer shaft 3 with a right-hand internal thread. The outer shaft 3 is connected to a lower clamping plate 7 through a connecting rod 6 and a moving rod 9. The inner shaft 10 is connected to an upper clamping plate 4. An opening and closing mechanism for adjusting the pinch valve core 5 is provided between the upper clamping plate 4 and the lower clamping plate 7. The electric actuator 1 drives the main shaft 2 to rotate. The outer shaft 3 drives the lower clamping plate 7 to move up and down through the connecting rod 6 and the moving rod 9. The inner shaft 10 drives the upper clamping plate 4 to move up and down. When the upper clamping plate 4 and the lower clamping plate 7 move inward, the opening and closing mechanism between the upper clamping plate 4 and the lower clamping plate 7 tightens the upper and lower ends of the clamping valve core 5 to realize the valve closing command. When the upper clamping plate 4 and the lower clamping plate 7 move towards each other, the opening and closing mechanism between the upper clamping plate 4 and the lower clamping plate 7 loosens the upper and lower ends of the clamping valve core 5 to realize the valve opening and closing command.

[0020] This application adds an opening and closing mechanism to the valve body. The upper clamping plate 4 and the lower clamping plate 7 respectively drive the slide rods 11 at the upper and lower ends to move. The slide rods 11 drive the clamp valve core 5 to move, thereby realizing the purpose of opening and closing the valve. This solves the problem that the clamp valve cannot be used normally when it is installed vertically and there is negative pressure. It broadens the application range of the clamp valve, extends the service life of the valve liner, and doubles the service life of the valve liner of the same specification, thus improving economic efficiency.

[0021] The opening and closing mechanism includes slide rods 11 fixedly connected to the upper and lower ends of the clamping valve core 5. The opening and closing ends of the slide rods 11 at the upper and lower ends are respectively connected to the upper clamping plate 4 and the lower clamping plate 7, and the hinged ends of the slide rods 11 are respectively hinged to the upper and lower ends of the housing 8. When the upper clamping plate 4 and the lower clamping plate 7 move inward, the upper clamping plate 4 and the lower clamping plate 7 respectively drive the opening and closing ends of the slide rods 11 at the upper and lower ends to move inward, tightening the upper and lower ends of the clamping valve core 5 to realize the valve closing command; when the upper clamping plate 4 and the lower clamping plate 7 move towards each other, the upper clamping plate 4 and the lower clamping plate 7 respectively drive the opening and closing ends of the slide rods 11 at the upper and lower ends to move towards each other, loosening the upper and lower ends of the clamping valve core 5 to realize the valve opening and closing command.

[0022] The sliding rod 11 has a U-shaped opening at its opening and closing end, which is slidably connected to the upper clamping plate 4 and the lower clamping plate 7. Both the upper clamping plate 4 and the lower clamping plate 7 are provided with sliding shafts 14 that are slidably connected to the U-shaped openings. The hinged end of the sliding rod 11 is hinged to the housing 8 via a pin 12. Figure 1 As shown, when the valve is open or closed, the sliding shaft 14 is located at the root of the U-shaped opening, and the sliding rods 11 at both ends are in a parallel state. Figure 2 As shown, when the valve is closed, the slide shaft 14 is located at the open end of the U-shaped opening, and the opening and closing ends of the slide rods 11 at the upper and lower ends tighten the inner walls of the upper and lower ends of the clamp valve core 5, forming an angle between the slide rods 11 at the upper and lower ends.

[0023] The clamp valve core 5 is fixedly connected to the slide rod 11 by a number of fabric straps 13. There are two fabric straps 13, which are located at the opening and closing end and the hinge end of the slide rod 11, respectively.

[0024] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A negative pressure resistant pinch valve, comprising an electric actuator (1) and a housing (8), wherein the electric actuator (1) drives a main shaft (2) to rotate within the housing (8), the main shaft (2) having internal and external rectangular threads, the main shaft (2) comprising an inner shaft (10) with a left-hand thread and an outer shaft (3) with a right-hand internal thread, the outer shaft (3) being connected to a lower clamping plate (7) via a connecting rod (6) and a moving rod (9), and the inner shaft (10) being connected to an upper clamping plate (4), characterized in that: An opening and closing mechanism for adjusting the clamping valve core (5) is provided between the upper clamping plate (4) and the lower clamping plate (7).

2. The negative pressure resistant pinch valve according to claim 1, characterized in that: The opening and closing mechanism includes a slide rod (11) fixedly connected to the upper and lower ends of the clamping valve core (5). The opening and closing ends of the slide rod (11) at the upper and lower ends are respectively connected to the upper clamping plate (4) and the lower clamping plate (7). The hinged ends of the slide rod (11) are respectively hinged to the upper and lower ends of the housing (8).

3. The negative pressure resistant pinch valve according to claim 2, characterized in that: The sliding rod (11) has a U-shaped opening at its opening and closing end, and the U-shaped opening is slidably connected to the upper clamping plate (4) and the lower clamping plate (7) respectively.

4. The negative pressure resistant pinch valve according to claim 3, characterized in that: Both the upper clamping plate (4) and the lower clamping plate (7) are provided with sliding shafts (14) that are slidably connected to the U-shaped opening.

5. The negative pressure resistant pinch valve according to claim 2, characterized in that: The hinged end of the slide rod (11) is hinged to the housing (8) via a pin (12).

6. The negative pressure resistant pinch valve according to claim 2, characterized in that: The clamp valve core (5) is fixedly connected to the slide rod (11) by several curtain straps (13).

7. The negative pressure resistant pinch valve according to claim 6, characterized in that: The number of the curtain tie straps (13) is two, and they are located at the opening and closing end and the hinge end of the slide rod (11), respectively.

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