Plastic butterfly valve

Abstract

The plastic butterfly valve comprises a butterfly valve supporting shell, a first fulcrum shaft and plastic valve clacks, the first fulcrum shaft is movably inserted into the center of the butterfly valve supporting shell in a penetrating mode, the plastic valve clacks are fixed to the two opposite sides of the first fulcrum shaft, and the peripheries of the plastic valve clacks are attached to the inner wall of the butterfly valve supporting shell; flanges are fixedly connected to the two sides of the butterfly valve supporting shell, two sealing mechanisms are arranged in the butterfly valve supporting shell in a staggered mode, the two sealing mechanisms are attached to the two opposite sides of the plastic valve clack respectively, the top end of a first supporting shaft is connected with a direct current motor through a connecting mechanism, and an operating mechanism is fixedly connected to the outer wall of one side of the connecting mechanism. The sealing mechanism comprises an arc-shaped supporting plate, the outer wall of the arc-shaped supporting plate is fixed to the inner wall of the butterfly valve supporting shell, and a rubber sleeve is fixedly connected to one side of the arc-shaped supporting plate. The plastic butterfly valve has the advantages that the sealing performance of the butterfly valve can be effectively improved, and meanwhile circulating objects cannot be excessively shielded.

Description

Technical Field

[0001] The invention relates to the field of butterfly valves, and in particular to a plastic butterfly valve. Background Art

[0002] A butterfly valve, also known as a flap valve, is a regulating valve with a simple structure. It can be used for switching control of low-pressure pipeline media. A butterfly valve refers to a valve in which the closing member (valve disc or butterfly plate) is a disc that rotates around the valve axis to achieve opening and closing.

[0003] Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. They mainly play the role of cutting off and throttling in pipelines. The butterfly valve opening and closing part is a disc-shaped butterfly plate that rotates around its own axis in the valve body to achieve the purpose of opening, closing or regulating.

[0004] Due to the simple structure of the butterfly valve, the sealing between the valve disc and the valve body can be easily affected during long-term use, resulting in insufficient isolation of the medium flowing in the closed state. Summary of the invention

[0005] The invention discloses a plastic butterfly valve, aiming to solve the technical problem that due to the simple structure of the butterfly valve, the sealing between the valve disc and the valve body is easily affected in long-term use, resulting in insufficient isolation of the medium flowing in the closed state.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A plastic butterfly valve comprises a butterfly valve support shell, a first support shaft and a plastic valve disc, wherein the first support shaft is movably inserted in the center position of the butterfly valve support shell, the plastic valve disc is fixed to the opposite sides of the first support shaft, and the outer periphery of the plastic valve disc is attached to the inner wall of the butterfly valve support shell, the two sides of the butterfly valve support shell are fixedly connected with flanges, two sealing mechanisms are staggeredly arranged in the butterfly valve support shell, and the two sealing mechanisms are respectively attached to the opposite sides of the plastic valve disc, the top of the first support shaft is connected to a DC motor through a connecting mechanism, and an operating mechanism is fixedly connected to an outer wall of one side of the connecting mechanism; the sealing mechanism comprises an arc-shaped support plate, and the outer wall of the arc-shaped support plate is fixed to the inner wall of the butterfly valve support shell, one side of the arc-shaped support plate is fixedly connected to a rubber sleeve, and a plurality of convex points are equidistantly arranged on the outer side of the rubber sleeve, the same side of the rubber sleeve contacts one side of the plastic valve disc, and the convex points are located between the rubber sleeve and the plastic valve disc, the inner side of the rubber sleeve is tightly connected to a rubber sealing sheet, and the rubber sleeve is filled with a paste filler;

[0008] The thickness of the rubber sealing sheet is thinner than that of the rubber sleeve, and the elastic force of the rubber sealing sheet is greater than that of the rubber sleeve;

[0009] The paste filler may be a polyurethane foam material.

[0010] A sealing mechanism is provided, in which the sealing degree between the plastic valve disc and the butterfly valve supporting shell is strengthened by being attached to both sides of the plastic valve disc. When the plastic valve disc is pressed against one side of the rubber sleeve, the rubber sleeve and the paste filler inside it can be squeezed, and the rubber sealing sheet can be stretched. The gap can be sealed by both the pressure given by the paste filler in the rubber sleeve and the shielding provided by the stretching of the rubber sealing sheet, thereby effectively improving the sealing performance. At the same time, based on the retraction of the rubber sealing sheet, when the butterfly valve is opened, it can avoid blocking the flowing objects due to excessive shielding area.

[0011] In a preferred embodiment, the connecting mechanism includes a cylindrical support shell, and the cylindrical support shell is fixed to the top end of the first support shaft, the bottom inner wall of the cylindrical support shell is fixedly connected to a spring, and the top end of the spring is fixedly connected to a circular support plate, the outer wall of the circular support plate movably fits the inner wall of the cylindrical support shell, the top outer wall of the circular support plate is equidistantly fixedly connected to a plurality of limit rods, and the opposite sides of the circular support plate are respectively fixedly connected to pressure rods, the opposite sides of the cylindrical support shell are respectively penetrated by a first L-shaped slide groove, and the pressure rod passes through the first L-shaped slide groove, the top movable sleeve of the cylindrical support shell is provided with a connecting sleeve, and the bottom inner wall of the connecting sleeve is equidistantly provided with a plurality of plug holes, and the plurality of limit rods are movably inserted into the plurality of plug holes, the top end of the connecting sleeve is fixedly connected to a second support shaft, the top end of the second support shaft is connected to the output end of the DC motor, and the second support shaft is externally connected to a bearing bracket.

[0012] By providing a connecting mechanism, the connecting mechanism is mainly used to establish a connection between the first support shaft and the DC motor, which can drive the pressure rod to be laterally inserted into one end of the first L-shaped slide groove, so that multiple limit rods are disconnected from the DC motor. Under this structure, switching between manual operation and automatic operation can be achieved, thereby providing a backup plan for the butterfly valve in an abnormal state to ensure the normal operation of the butterfly valve.

[0013] In a preferred solution, the operating mechanism includes a U-shaped bracket, and the U-shaped bracket is fixed to an outer wall of one side of a cylindrical support shell, damping L-shaped grooves are provided on both sides of the U-shaped bracket, and a damping slider is movably connected in the damping L-shaped groove, one side of the damping slider is fixedly connected to a U-shaped support plate, and an inner support plate is fitted in the U-shaped support plate, the inner support plate and the top end of the U-shaped support plate are simultaneously connected to damping hinges, and the bottom end of the U-shaped support plate is connected to a soft pad.

[0014] An operating mechanism is provided, which is used to provide a fulcrum when switching to manual operation. By driving the damping slider to move in the damping L-shaped slide groove and making the U-shaped support plate horizontal, the stored inner support plate can be opened at the damping hinge position and extended to form a suitable length for handholding, thereby facilitating manual operation.

[0015] As can be seen from the above, a plastic butterfly valve comprises a butterfly valve support shell, a first support shaft and a plastic valve disc, wherein the first support shaft is movably inserted in the center position of the butterfly valve support shell, the plastic valve disc is fixed to the opposite sides of the first support shaft, and the outer periphery of the plastic valve disc is attached to the inner wall of the butterfly valve support shell, the two sides of the butterfly valve support shell are fixedly connected with flanges, two sealing mechanisms are alternately arranged in the butterfly valve support shell, and the two sealing mechanisms are respectively attached to the opposite sides of the plastic valve disc, the top of the first support shaft is connected to a DC motor through a connecting mechanism, and an operating mechanism is fixedly connected to an outer wall of one side of the connecting mechanism; the sealing mechanism comprises an arc-shaped support plate, and the outer wall of the arc-shaped support plate is fixed to the inner wall of the butterfly valve support shell, one side of the arc-shaped support plate is fixedly connected to a rubber sleeve, and a plurality of convex points are equidistantly arranged on the outer side of the rubber sleeve, the same side of the rubber sleeve is in contact with one side of the plastic valve disc, and the convex points are located between the rubber sleeve and the plastic valve disc, the inner side of the rubber sleeve is tightly connected to a rubber sealing sheet, and the rubber sleeve is filled with a paste filler. The plastic butterfly valve provided by the present invention has the technical effect of effectively improving the sealing performance of the butterfly valve and not causing excessive obstruction to the circulating objects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The figure is a schematic diagram of the overall structure of a plastic butterfly valve proposed by the present invention.

[0017] Figure 2 This is a schematic diagram of the internal structure of a plastic butterfly valve proposed by the present invention.

[0018] Figure 3 This is a schematic diagram of a sealing mechanism of a plastic butterfly valve proposed by the present invention.

[0019] Figure 4 The figure is a schematic diagram of the disassembly of the connection mechanism of a plastic butterfly valve proposed in the present invention.

[0020] Figure 5 The present invention provides a schematic diagram of the disassembled structure of the operating mechanism of a plastic butterfly valve.

[0021] In the figure: 1. DC motor; 2. connecting mechanism; 3. operating mechanism; 4. flange; 5. butterfly valve support shell; 6. plastic valve disc; 7. first support shaft; 8. sealing mechanism; 201. bearing bracket; 202. connecting sleeve; 203. pressure rod; 204. second support shaft; 205. plug hole; 206. cylindrical support shell; 207. limiting plug rod; 208. circular support plate; 209. spring; 210. first L-shaped slide groove; 301. U-shaped bracket; 302. damping L-shaped slide groove; 303. inner support plate; 304. damping hinge; 305. U-shaped support plate; 306. damping slider; 307. cushion; 801. arc support plate; 802. rubber sleeve; 803. bump; 804. rubber sealing sheet. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] A plastic butterfly valve disclosed in the present invention is mainly applied to scenarios where butterfly valves are used.

[0024] Reference Figure 1-Figure 3A plastic butterfly valve comprises a butterfly valve support shell 5, a first support shaft 7 and a plastic blade 6. The first support shaft 7 is movably inserted in the center of the butterfly valve support shell 5. The plastic blade 6 is fixed to the opposite sides of the first support shaft 7, and the outer periphery of the plastic blade 6 is attached to the inner wall of the butterfly valve support shell 5. The two sides of the butterfly valve support shell 5 are fixedly connected with flanges 4. Two sealing mechanisms 8 are staggered in the butterfly valve support shell 5, and the two sealing mechanisms 8 are attached to the opposite sides of the plastic blade respectively. The top of the first support shaft 7 is connected by a coupling. The connecting mechanism 2 is connected to the DC motor 1, and the outer wall of one side of the connecting mechanism 2 is fixedly connected to the operating mechanism 3; the sealing mechanism 8 includes an arc-shaped support plate 801, and the outer wall of the arc-shaped support plate 801 is fixed to the inner wall of the butterfly valve support shell 5, and one side of the arc-shaped support plate 801 is fixedly connected to a rubber sleeve 802, and the outer side of the rubber sleeve 802 is equidistantly provided with a plurality of convex points 803, the same side of the rubber sleeve 802 is in contact with one side of the plastic blade 6, and the convex point 803 is located between the rubber sleeve 802 and the plastic blade 6, The inner side of the rubber sleeve 802 is tightly connected with a rubber sealing sheet 804, and the rubber sleeve 802 is filled with a paste filler. In the sealing mechanism 8, the sealing degree between the plastic blade 6 and the butterfly valve support shell 5 is strengthened by fitting to the two sides of the plastic blade 6, wherein the first support shaft 7 is driven to rotate by the DC motor 1, and when the plastic blade 6 is pressed on one side of the rubber sleeve 802, the rubber sleeve 802 and the paste filler inside it can be squeezed. During the squeezing process, the setting of multiple convex points 803 can avoid the squeezing position from sliding, thereby ensuring the stability of the squeezing. After squeezing, the paste filler is discharged from the position of the rubber sealing sheet 804, and drives the rubber sealing sheet 804 to stretch to expand the shielding area, so that the gap is sealed by the pressure given by the paste filler in the rubber sleeve 802 and the shielding provided by the stretching of the rubber sealing sheet 804, effectively improving the sealing performance. At the same time, based on the retraction of the rubber sealing sheet 804, when the butterfly valve is opened, it can avoid that the excessive shielding area blocks the flowing objects.

[0025] Reference Figure 3 In a preferred embodiment, the thickness of the rubber sealing sheet 804 is thinner than the thickness of the rubber sleeve 802 , and the elastic force of the rubber sealing sheet 804 is greater than the elastic force of the rubber sleeve 802 .

[0026] Reference Figure 1 In a preferred embodiment, the paste filler may be a polyurethane foam material.

[0027] Reference Figure 4 In a preferred embodiment, the connecting mechanism 2 includes a cylindrical support shell 206, and the cylindrical support shell 206 is fixed to the top of the first support shaft 7, the inner wall of the bottom end of the cylindrical support shell 206 is fixedly connected to a spring 209, and the top of the spring 209 is fixedly connected to a circular support plate 208.

[0028] Reference Figure 4 In a preferred embodiment, the outer wall of the circular support plate 208 is movably fitted to the inner wall of the columnar support shell 206, a plurality of limit rods 207 are equidistantly fixedly connected to the top outer wall of the circular support plate 208, and pressure rods 203 are fixedly connected to the opposite sides of the circular support plate 208.

[0029] Reference Figure 4 In a preferred embodiment, first L-shaped grooves 210 are respectively provided on opposite sides of the columnar support shell 206, and the pressure rod 203 passes through the first L-shaped grooves 210. The top movable sleeve of the columnar support shell 206 has a connecting sleeve 202, and a plurality of plug holes 205 are equidistantly provided on the inner wall of the bottom end of the connecting sleeve 202.

[0030] Reference Figure 4 In a preferred embodiment, a plurality of limit rods 207 are movably inserted into a plurality of plug holes 205, a second support shaft 204 is fixedly connected to the top of the connecting sleeve 202, a top of the second support shaft 204 is connected to the output end of the DC motor 1, and a bearing bracket 201 is externally connected to the second support shaft 204, and the connecting mechanism 2 is mainly used to establish a connection between the first support shaft 7 and the DC motor 1, and a plurality of limit rods 207 are inserted into a plurality of plug holes 205 to realize the driving of the first support shaft 7 by the DC motor 1, and if the motor 1 is abnormal and affects the normal opening and closing of the plastic blade 6, the pressure rod 203 can be manually pressed down, and the pressure rod 203 can be horizontally inserted into one end of the first L-shaped slide groove 210, so that the plurality of limit rods 207 can be disconnected from the DC motor 1, and under this structure, the switching between manual operation and automatic operation can be realized, thereby providing a backup plan for the butterfly valve in an abnormal state to ensure the normal operation of the butterfly valve.

[0031] Reference Figure 5 In a preferred embodiment, the operating mechanism 3 includes a U-shaped bracket 301, and the U-shaped bracket 301 is fixed to an outer wall of one side of the cylindrical support shell 206, and a damping L-shaped groove 302 is provided on both sides of the U-shaped bracket 301, and a damping slider 306 is movably connected in the damping L-shaped groove 302.

[0032] Reference Figure 5In a preferred embodiment, a U-shaped support plate 305 is fixedly connected to one side of the damping slider 306, and an inner support plate 303 is fitted inside the U-shaped support plate 305, and the inner support plate 303 and the top of the U-shaped support plate 305 are simultaneously connected to a damping hinge 304, and the bottom end of the U-shaped support plate 305 is connected to a soft pad 307. The operating mechanism 3 is used to provide a fulcrum when switching to manual operation, by driving the damping slider 306 to move in the damping L-shaped slide groove 302 and making the U-shaped support plate 305 horizontal, the inner support plate 303 stored at the damping hinge 304 position can be opened and extended to form a suitable hand-held length, thereby facilitating manual operation. In addition, under the action of the soft pad 307, the U-shaped support plate 305 can be pressed against the inner side of the U-shaped bracket 301 in a horizontal state, thereby ensuring the horizontal state of the U-shaped support plate 305 by squeezing.

[0033] Working principle: In the sealing mechanism 8, the sealing degree between the plastic blade 6 and the butterfly valve support shell 5 is strengthened by fitting on both sides of the plastic blade 6, wherein the first support shaft 7 is driven to rotate by the DC motor 1, and when the plastic blade 6 is pressed on one side of the rubber sleeve 802, the rubber sleeve 802 and the paste filler inside it can be squeezed. During the squeezing process, the setting of multiple convex points 803 can prevent the squeezing position from sliding, thereby ensuring the stability of the squeezing. After squeezing, the paste filler is discharged from the position of the rubber sealing sheet 804, and the rubber sealing sheet 804 is driven to stretch to expand the shielding area, so that the gap is sealed by the pressure given by the paste filler in the rubber sleeve 802 and the shielding provided by the stretching of the rubber sealing sheet 804, effectively improving the sealing. Sealing performance, based on the retraction of the rubber sealing sheet 804, when the butterfly valve is opened, it can avoid blocking the flowing objects with excessive blocking area. The connecting mechanism 2 is mainly used to establish the connection between the first support shaft 7 and the DC motor 1, and it is through multiple limit rods 207 inserted into multiple plug holes 205 to realize the driving of the first support shaft 7 by the DC motor 1. If the motor 1 is abnormal and affects the normal opening and closing of the plastic blade 6, the pressure rod 203 can be manually pressed down, and the pressure rod 203 can be horizontally inserted into one end of the first L-shaped slide groove 210, so that the multiple limit rods 207 can be disconnected from the DC motor 1. Under this structure, the switching between manual operation and automatic operation can be realized, thereby providing a backup plan for the butterfly valve in an abnormal state to ensure the normal operation of the butterfly valve.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A plastic butterfly valve, comprising a butterfly valve support housing (5), a first support shaft (7) and a plastic valve disc (6), characterized in that: The first support shaft (7) is movably inserted into the center position of the butterfly valve support shell (5); the plastic valve flap (6) is fixed to the opposite sides of the first support shaft (7), and the outer periphery of the plastic valve flap (6) is attached to the inner wall of the butterfly valve support shell (5); the two sides of the butterfly valve support shell (5) are fixedly connected with flanges (4); two sealing mechanisms (8) are alternately arranged in the butterfly valve support shell (5), and the two sealing mechanisms (8) are respectively attached to the opposite sides of the plastic valve flap; the top end of the first support shaft (7) is connected to a DC motor (1) via a connecting mechanism (2), and one side outer wall of the connecting mechanism (2) is fixedly connected to an operating mechanism (3); The sealing mechanism (8) comprises an arc-shaped support plate (801), and the outer wall of the arc-shaped support plate (801) is fixed to the inner wall of the butterfly valve support shell (5); a rubber sleeve (802) is fixedly connected to one side of the arc-shaped support plate (801), and a plurality of convex points (803) are equidistantly arranged on the outer side of the rubber sleeve (802); the same side of the rubber sleeve (802) contacts one side of the plastic valve flap (6), and the convex points (803) are located between the rubber sleeve (802) and the plastic valve flap (6); the inner side of the rubber sleeve (802) is tightly connected to a rubber sealing sheet (804), and the rubber sleeve (802) is filled with a paste filler.

2. A plastic butterfly valve according to claim 1, characterized in that: The thickness of the rubber sealing sheet (804) is thinner than the thickness of the rubber sleeve (802), and the elastic force of the rubber sealing sheet (804) is greater than the elastic force of the rubber sleeve (802).

3. A plastic butterfly valve according to claim 1, characterized in that: The paste filler may be a polyurethane foam material.

4. A plastic butterfly valve according to claim 1, characterized in that: The connection mechanism (2) comprises a columnar support shell (206), and the columnar support shell (206) is fixed to the top end of the first support shaft (7), the inner wall of the bottom end of the columnar support shell (206) is fixedly connected to a spring (209), and the top end of the spring (209) is fixedly connected to a circular support plate (208).

5. A plastic butterfly valve according to claim 4, characterized in that: The outer wall of the circular support plate (208) is movably fitted to the inner wall of the columnar support shell (206), a plurality of limit rods (207) are fixedly connected to the outer wall of the top end of the circular support plate (208) at equal intervals, and pressure rods (203) are fixedly connected to the opposite sides of the circular support plate (208).

6. A plastic butterfly valve according to claim 5, characterized in that: The first L-shaped slide grooves (210) are respectively provided on opposite sides of the columnar support shell (206), and the pressure rod (203) passes through the first L-shaped slide grooves (210). The top movable sleeve of the columnar support shell (206) has a connecting sleeve (202), and the bottom inner wall of the connecting sleeve (202) is equidistantly provided with a plurality of plug holes (205).

7. A plastic butterfly valve according to claim 6, characterized in that: The plurality of limit rods (207) are movably inserted into the plurality of plug holes (205); the top end of the connecting sleeve (202) is fixedly connected to a second support shaft (204); the top end of the second support shaft (204) is connected to the output end of the DC motor (1); and the second support shaft (204) is externally connected to a bearing bracket (201).

8. A plastic butterfly valve according to claim 1, characterized in that: The operating mechanism (3) comprises a U-shaped bracket (301), and the U-shaped bracket (301) is fixed to an outer wall of one side of the columnar support shell (206), and damping L-shaped sliding grooves (302) are provided on both sides of the U-shaped bracket (301), and a damping slider (306) is movably connected in the damping L-shaped sliding groove (302).

9. A plastic butterfly valve according to claim 8, characterized in that: A U-shaped support plate (305) is fixedly connected to one side of the damping slider (306), and an inner support plate (303) is fitted inside the U-shaped support plate (305), the inner support plate (303) and the top ends of the U-shaped support plate (305) are simultaneously connected to a damping hinge (304), and the bottom end of the U-shaped support plate (305) is connected to a soft pad (307).

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