Novel double-worm-gear drive butterfly valve

Abstract

The utility model discloses a novel double worm wheel drive butterfly valve which comprises a valve body provided with an inner cavity, a valve rod partially located in the inner cavity, an inlet and an outlet, the inlet and the outlet are communicated with the inner cavity, a butterfly plate is arranged in the inner cavity of the valve body, the butterfly plate is connected with the valve rod, two opposite through holes are further formed in the valve body, and the through holes are communicated with the valve rod. The valve rod penetrates through the two through holes and is movably and hermetically connected with the valve body at the two through holes, two ends of the valve rod are respectively connected with a driving device, and the two driving devices can independently or simultaneously drive the valve rod to rotate in the valve body. According to the novel double-worm-gear-driven butterfly valve, the valve cannot be opened and closed due to long-time operation, or under the condition that the valve is not operated for a long time and cannot be opened and closed suddenly, the valve rod can be driven to rotate by independently or simultaneously using the worm gear driving devices, so that opening and closing of the valve are achieved, and meanwhile the zero leakage target is achieved.

Description

Technical Field

[0001] The utility model relates to a worm gear butterfly valve, in particular to a novel double-worm gear driven butterfly valve. Background Art

[0002] A butterfly valve, also called a flap valve, is a simple regulating valve that can be used for the on-off control of low-pressure pipeline media. A butterfly valve is a valve whose closing member (valve disc or butterfly plate) is a disc that rotates around the valve stem to open and close. A worm gear butterfly valve is a type of butterfly valve. It is widely used in industrial production because of its simple structure, small size, light weight, and quick opening and closing by rotating 90°. It is easy to operate. At the same time, the valve has good fluid control characteristics.

[0003] At present, the sealing surface of the butterfly valve disc and the valve seat adopts a conical structure in the market, and the oblique conical surface of the valve disc is welded with heat-resistant and corrosion-resistant alloy materials. However, due to structural reasons, the traditional process cannot achieve two-way sealing performance. Although the centerline soft-seal butterfly valve has achieved two-way sealing, it is easy to be over-tightened during the closing process, and the sealing performance is relatively poor. In addition, the switching torque of the eccentric butterfly valve is large. In chemical and harsh working conditions, long-term operation may make the valve unable to open and close. Or when the valve has not been operated for a long time, it is suddenly found that it cannot be opened and closed, which undoubtedly increases the risk of accidents. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the current worm gear butterfly valve, the utility model provides a new double worm gear driven butterfly valve. When the valve cannot be opened or closed due to long-term operation, or when the valve is not operated for a long time and suddenly found to be unable to open or close, the worm gear drive device is used alone or simultaneously to drive the valve stem to rotate, so as to open and close the valve and achieve the goal of zero leakage. In order to achieve the above-mentioned purpose, the embodiment of the utility model adopts the following technical solutions:

[0005] A novel double worm gear driven butterfly valve comprises a valve body with an inner cavity, a valve stem partially located in the inner cavity, and an inlet and an outlet connected to the inner cavity. A butterfly plate is provided in the inner cavity of the valve body, and the butterfly plate is connected to the valve stem. Two opposite through holes are also provided on the valve body. The valve stem passes through the two through holes and is movably sealed to the valve body at the two through holes. Two ends of the valve stem are respectively connected to a driving device. The two driving devices can drive the valve stem to rotate in the valve body individually or simultaneously.

[0006] According to one aspect of the utility model, the driving device includes a worm gear head and a hand wheel, the worm gear head is connected to the hand wheel, and the worm gear head is connected to the valve stem.

[0007] According to one aspect of the utility model, a sealing ring pressure plate is provided on one side of the butterfly plate, a butterfly valve sealing ring is provided between the butterfly plate and the sealing ring pressure plate, and the butterfly valve sealing ring is arranged on the outer peripheral wall of the butterfly plate, and the butterfly plate and the sealing ring pressure plate are connected by screws.

[0008] According to one aspect of the utility model, the butterfly plate is fixedly mounted on the valve stem by means of set screws, a middle flat key is provided on the valve stem in the inner cavity, and the valve stem and the butterfly plate are connected by means of the middle flat key.

[0009] According to one aspect of the utility model, both ends of the valve body are connected to a transmission bracket respectively, the transmission bracket is connected to the valve body via a fixing bolt, and the driving device is connected to the transmission bracket.

[0010] According to one aspect of the utility model, a packing is respectively provided in the two through holes of the valve body, a packing pad is provided at one end of the packing, a packing pad and a packing gland are respectively provided at both ends of the packing, and the packing gland is arranged inside the cavity of the transmission bracket, and the valve stem is movably sealed and connected to the valve body through the packing, the packing pad and the packing gland.

[0011] According to one aspect of the utility model, the packing gland is connected to the transmission bracket and the valve body through one end of a stud, and the other end of the stud is connected to a nut.

[0012] According to one aspect of the utility model, an oil-free bearing is respectively arranged between the two ends of the inner cavity of the valve body and the valve stem.

[0013] According to one aspect of the utility model, a transmission flat key is respectively provided at both ends of the valve stem, and the transmission flat key is connected to the worm gear head.

[0014] According to one aspect of the utility model, the transmission bracket is fixedly connected to the driving device by bolts.

[0015] The advantages of the implementation of the utility model are as follows: the butterfly valve sealing ring is fixed to the butterfly plate by the sealing ring pressure plate, which can effectively prevent the butterfly valve sealing ring from displacement and deformation; the butterfly valve sealing ring is arranged on the outer peripheral wall of the butterfly plate, which helps to improve the sealing performance of the butterfly valve, thereby achieving the goal of zero leakage; a transmission bracket is arranged between the valve body and the driving device, and is connected to the valve body and the driving device by bolts, so that the valve body can be stably connected to the two driving devices, thereby improving the overall performance; the arrangement of the packing pad, the packing and the packing gland prevents gas or liquid from leaking from the gap between the valve body and the valve stem, thereby achieving an efficient sealing effect and ensuring the long-term stable operation of the valve body; the arrangement of the oil-free bearing 7 effectively reduces the valve stem during the opening and closing process The friction coefficient between the valve body and the valve body is reduced, and the torque is reduced, so that the opening and closing of the valve is lighter, faster and more sensitive; by arranging the driving devices at both ends of the valve body, when the valve cannot be opened and closed due to long-term operation, or when the valve has not been operated for a long time and it is suddenly found that it cannot be opened and closed, it can be switched to another driving device to open and close the valve, or two driving devices can be operated at the same time to open and close the valve; the double worm gear driven butterfly valve of the utility model can achieve no wear, two-way zero leakage, long service life, and can withstand a certain reverse pressure. It is a high-performance excellent product with a minimum operating temperature of -196°C and a maximum operating temperature of 815°C. Due to its good flow characteristics, it can close and cut off the medium, and can also adjust the flow of the medium at will. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 This is a structural schematic diagram of a novel double worm gear driven butterfly valve described in the utility model;

[0018] Numbers in the figure: 1. Valve body; 2. Valve stem; 3. Butterfly plate; 4. Driving device; 41. Worm gear head; 42. Handwheel; 43. Worm; 5. Set screw; 6. Middle flat key; 7. Oil-free bearing; 8. Packing gland; 9. Fixing bolt; 10. Rivet; 11. Nameplate; 12. Bolt; 13. Drive flat key; 14. Drive bracket; 15. Nut; 16. Stud; 17. Packing; 18. Packing pad; 19. Butterfly valve sealing ring; 20. Screw; 21. Sealing ring pressure plate. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] like Figure 1 As shown, a novel double worm gear driven butterfly valve comprises a valve body 1 with an inner cavity, a valve stem 2 partially located in the inner cavity, and an inlet and an outlet communicated with the inner cavity, wherein the inlet and the outlet are connected to a pipeline, a butterfly plate 3 is provided in the inner cavity of the valve body 1, and the butterfly plate 3 is mounted on one side of the valve stem 2. The valve body 1 is also provided with two opposite through holes, wherein the valve stem 2 passes through the two through holes and is movably sealed to the valve body at the two through holes, each end of the valve stem 2 is connected to a driving device 4, and the two driving devices are symmetrically arranged on both sides of the valve body, and the two driving devices (4) can drive the valve stem (2) to rotate in the valve body (1) individually or simultaneously. The driving device 4 includes a worm gear head 41 and a hand wheel 42, wherein the worm gear head 41 is connected to the hand wheel 42, and the worm gear head 41 is connected to the valve stem 2. Preferably, the driving device 4 also includes a worm 43, wherein the worm 43 is connected to the hand wheel 42, and the worm 43 is matched and connected to the worm gear head 41. Preferably, a transmission flat key 13 is provided at each end of the valve stem 2, wherein the transmission flat key is symmetrically arranged on the valve stem 2, and the transmission flat key 13 is connected to the worm gear head 41. By manually rotating the hand wheel 42, the worm 43 is driven to rotate, and the worm gear head 41 is further driven to rotate, and the valve stem 2 is driven to rotate through the transmission flat key 13, so that the butterfly plate 3 is rotated, and the valve body is opened and closed; this is convenient for manual operation and more convenient to use; obviously, a motor can also be provided to be connected to the worm gear or directly connected to the valve stem 2, and the valve stem 2 is driven to rotate by the motor, so that it is more flexible to use. By connecting the two ends of the valve body 1 to a driving device 4 respectively, when the valve cannot be opened or closed due to long-term operation, or when the valve has not been operated for a long time and suddenly finds that it cannot be opened or closed, another driving device 4 can be switched to open and close the valve, or two driving devices 4 can be operated simultaneously to open and close the valve.

[0021] In actual application, the butterfly plate 3 is fixed to the valve stem 2 by a set screw 5. An intermediate flat key 6 is provided on the valve stem 2 located in the inner cavity part of the valve body 1. The valve stem 2 and the butterfly valve are connected by the intermediate flat key 6. The driving device 4 drives the valve stem to rotate, and drives the butterfly valve to rotate by the intermediate flat key 6 and the set screw 5, thereby realizing the opening and closing of the valve.

[0022] In practical applications, a sealing ring pressing plate 21 is provided on one side of the butterfly plate 3, a butterfly valve sealing ring 19 is provided between the butterfly plate 3 and the sealing ring pressing plate 21, and the butterfly valve sealing ring 19 is located on the outer peripheral wall of the butterfly plate 3, and the butterfly plate 3 and the sealing ring pressing plate 21 are fixedly connected by screws 20. The butterfly valve sealing ring 19 is fixed to the butterfly plate 3 by the sealing ring pressing plate 21, which can effectively prevent the butterfly valve sealing ring 19 from displacement and deformation; the bottom plate sealing ring 19 is provided on the outer peripheral wall of the butterfly plate 3, which helps to improve the sealing performance of the butterfly valve, thereby achieving the goal of zero leakage.

[0023] In practical applications, a transmission bracket 14 is provided between the valve body 1 and the drive device 4, one end of the transmission bracket 14 is mounted on both ends of the valve body 1 by fixing bolts 9, and the other end of the transmission bracket 14 is fixedly connected to the worm gear head 41 by bolts 12, so that the valve body can be stably connected to the two drive devices 4, thereby improving the overall performance. Preferably, a nameplate 11 is provided on one side of the transmission bracket, and the nameplate 11 is connected to the transmission bracket by rivets 10.

[0024] In practical applications, a packing 17 is provided in each of the two through holes of the valve body 1, that is, packings 17 are provided at both ends of the valve body and the two through holes, one end of the packing 17 is provided with a packing pad 18, and the packing pad 18 is sleeved on the valve stem 2, and the other end of the packing 17 is provided with a packing gland 8, which is arranged inside the cavity of the transmission bracket 14, and the valve stem 2 is movably sealed and connected to the valve body 1 through the packing 17, the packing pad 18 and the packing gland 8. The packing gland 8 is connected to the transmission bracket and the valve body 1 through one end of the stud 16, and the other end of the stud 16 is connected with a nut 15, so that the packing gland and the transmission bracket are fixed to the valve body 1, so that the valve stem 2 is movably sealed and connected to the valve body 1. Through the arrangement of the packing pad 18, the packing 17 and the packing gland 8, gas or liquid is prevented from leaking from the gap between the valve body 1 and the valve stem 2, an efficient sealing effect is achieved, and the long-term stable operation of the valve body is ensured.

[0025] In practical applications, an oil-free bearing 7 is provided between the two ends of the inner cavity of the valve body 1 and the valve stem 2, so as to reduce the friction coefficient between the valve stem and the valve body during the opening and closing process, reduce the torque, and make the opening and closing of the valve easier, faster and more sensitive.

[0026] The new double turbine driven butterfly valve has reliable sealing performance. Its main structure is that the valve body valve seat sealing surface and the butterfly valve sealing ring are sealed. The sealing pair is designed based on the principle of three eccentricity to ensure the sealing effect, while reducing wear and making the sealing surface have a longer service life. Advanced CNC machining technology is applied to the manufacturing of the sealing pair to improve the concentricity of the sealing surface and the valve stem hole, reduce friction, thereby ensuring the sealing effect of the valve and achieving the goal of zero leakage.

[0027] The advantages of the implementation of the utility model are as follows: the butterfly valve sealing ring is fixed to the butterfly plate by the sealing ring pressure plate, which can effectively prevent the butterfly valve sealing ring from displacement and deformation; the butterfly valve sealing ring is arranged on the outer peripheral wall of the butterfly plate, which helps to improve the sealing performance of the butterfly valve, thereby achieving the goal of zero leakage; a transmission bracket is arranged between the valve body and the driving device, and is connected to the valve body and the driving device by bolts, so that the valve body can be stably connected to the two driving devices, thereby improving the overall performance; the arrangement of the packing pad, the packing and the packing gland prevents gas or liquid from leaking from the gap between the valve body and the valve stem, thereby achieving an efficient sealing effect and ensuring the long-term stable operation of the valve body; the arrangement of the oil-free bearing 7 effectively reduces the valve stem during the opening and closing process The friction coefficient between the valve body and the valve body is reduced, and the torque is reduced, so that the opening and closing of the valve is lighter, faster and more sensitive; by arranging the driving devices at both ends of the valve body, when the valve cannot be opened and closed due to long-term operation, or when the valve has not been operated for a long time and it is suddenly found that it cannot be opened and closed, it can be switched to another driving device to open and close the valve, or two driving devices can be operated at the same time to open and close the valve; the double worm gear driven butterfly valve of the utility model can achieve no wear, two-way zero leakage, long service life, and can withstand a certain reverse pressure. It is a high-performance excellent product with a minimum operating temperature of -196°C and a maximum operating temperature of 815°C. Due to its good flow characteristics, it can close and cut off the medium, and can also adjust the flow of the medium at will.

[0028] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A novel double worm gear driven butterfly valve, comprising a valve body (1) provided with an inner cavity, a valve stem (2) partially located in the inner cavity, and an inlet and an outlet communicated with the inner cavity, wherein a butterfly plate (3) is provided in the inner cavity of the valve body (1), and the butterfly plate (3) is connected to the valve stem (2), and is characterized in that: The valve body (1) is also provided with two opposite through holes, the valve stem (2) passes through the two through holes and is movably sealed to the valve body (1) at the two through holes, and each end of the valve stem (2) is connected to a driving device (4), and the two driving devices (4) can drive the valve stem (2) to rotate in the valve body (1) individually or simultaneously.

2. The new double worm gear driven butterfly valve according to claim 1 is characterized in that: The driving device (4) comprises a worm gear head (41) and a hand wheel (42); the worm gear head (41) is connected to the hand wheel (42); and the worm gear head (41) is connected to the valve stem (2).

3. The new double worm gear driven butterfly valve according to claim 1 is characterized in that: A sealing ring pressing plate (21) is provided on one side of the butterfly plate (3), a butterfly valve sealing ring (19) is provided between the butterfly plate (3) and the sealing ring pressing plate (21), and the butterfly valve sealing ring (19) is arranged on the outer peripheral wall of the butterfly plate (3), and the butterfly plate (3) and the sealing ring pressing plate (21) are connected by screws (20).

4. The novel double worm gear driven butterfly valve according to claim 1 is characterized in that: The butterfly plate (3) is fixedly mounted on the valve stem (2) via a set screw (5); a middle flat key (6) is provided on the valve stem (2) located in the inner cavity; and the valve stem (2) and the butterfly plate (3) are connected via the middle flat key (6).

5. The novel double worm gear driven butterfly valve according to claim 4 is characterized in that: Both ends of the valve body (1) are connected to a transmission bracket (14), the transmission bracket (14) is connected to the valve body (1) via a fixing bolt (9), and the drive device (4) is connected to the transmission bracket (14).

6. The novel double worm gear driven butterfly valve according to claim 5 is characterized in that: A packing (17) is disposed in each of the two through holes of the valve body (1), and packing pads (18) and packing glands (8) are disposed at both ends of the packing (17), respectively. The packing glands (8) are disposed inside the cavity of the transmission bracket (14), and the valve stem (2) and the valve body (1) are movably sealed by the packing (17), the packing pads (18) and the packing glands (8).

7. The novel double worm gear driven butterfly valve according to claim 6 is characterized in that: The packing gland (8) is connected to the transmission bracket (14) and the valve body (1) via one end of a stud bolt (16), and the other end of the stud bolt (16) is connected to a nut (15).

8. The novel double worm gear driven butterfly valve according to claim 1 is characterized in that: An oil-free bearing (7) is provided between the two ends close to the inner cavity of the valve body (1) and the valve stem (2).

9. The novel double worm gear driven butterfly valve according to claim 2 is characterized in that: A transmission flat key (13) is respectively provided at both ends of the valve stem (2), and the transmission flat key (13) is connected to the worm gear head (41).

10. The novel double worm gear driven butterfly valve according to claim 5 is characterized in that: The transmission bracket (14) is fixedly connected to the driving device (4) via bolts (12).

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