Eccentric butterfly valve

Abstract

The invention relates to the related technical field of butterfly valves, and discloses an eccentric butterfly valve which comprises a butterfly valve square tube, a first protective shell is fixedly mounted on the upper surface of the butterfly valve square tube, second protective shells are fixedly mounted on the surfaces of the two sides of the butterfly valve square tube, and a driving unit is arranged on the outer side surface of the butterfly valve square tube and in the first protective shell. Clamping units are arranged on the outer side surface of the butterfly valve square pipe and in the second protective shell. A fifth conical tooth in the clamping unit rotates to enable a threaded abutting rod to move downwards in a threaded mode in a partition block to abut against a second abutting block, the second abutting block abuts against a first abutting block on the downward moving side of a second cavity, the first abutting block slides on one side to abut against a sliding column, and therefore an annular sealing clamp is abutted to clamp a butterfly plate in a sealed mode. According to the butterfly valve, friction cannot be generated between the butterfly plate and the inner wall of the butterfly valve during rotation, so that the inner wall of the butterfly valve cannot be damaged, the sealing performance between the butterfly plate and the inner wall of the butterfly valve cannot be affected, the stability of the butterfly plate can be guaranteed, and the butterfly plate cannot be affected by water pressure or air pressure.

Description

Technical Field

[0001] The present invention belongs to the technical field related to butterfly valves, and more specifically, particularly relates to an eccentric butterfly valve. Background Art

[0002] A butterfly valve is a control valve with a disc as the opening and closing component, usually called a butterfly-shaped valve. Its closing component (valve flap or disc) is a disc, which rotates around the valve shaft to achieve opening and closing. The opening and closing component of the butterfly valve is a disc-shaped butterfly plate, which rotates around its own axis in the valve body to achieve the purpose of opening and closing or adjusting.

[0003] In the prior art, an eccentric butterfly valve often has the following defects when in use: when the butterfly valve is in use, the opening or closing of the butterfly plate is controlled to control the inflow and outflow of water or gas. However, when the butterfly plate rotates, it will rub against the inner wall of the butterfly valve. Over time, the gap between the butterfly plate and the inner wall of the butterfly valve will become larger, thus affecting the sealing performance. And when the butterfly plate is in use, due to the large water pressure or air pressure inside the butterfly valve, the butterfly plate will be loosened and deformed over a long period, thus affecting the normal opening and closing of the butterfly plate.

[0004] Therefore, in view of this, research and improvement are carried out on the existing structure and defects, and an eccentric butterfly valve is provided in order to achieve a more practical purpose. Summary of the Invention

[0005] The present invention provides an eccentric butterfly valve to overcome the above defects in the prior art.

[0006] The purpose and effect of an eccentric butterfly valve of the present invention are achieved by the following specific technical means:

[0007] An eccentric butterfly valve includes a butterfly valve square pipe. A first protective shell is fixedly installed on the upper surface of the butterfly valve square pipe. Second protective shells are fixedly installed on both side surfaces of the butterfly valve square pipe. Two limiting angle blocks are welded and installed on the inner surface of a valve groove penetrating through the outer surface of the butterfly valve square pipe. A butterfly plate is rotatably installed in the valve groove penetrating through the outer surface of the butterfly valve square pipe. A driving unit is arranged on the outer surface of the butterfly valve square pipe and inside the first protective shell. A clamping unit is arranged on the outer surface of the butterfly valve square pipe and inside the second protective shells.

[0008] In a further technical solution, the driving unit includes a sliding plate. The sliding plate is slidably installed on one side surface of the first protective shell. Limiting pieces one and two are respectively welded and installed at both ends of the sliding plate. A plate tooth is installed on one side surface of the limiting piece two. An electric screw rod is fixedly installed on the other side surface of the first protective shell. The working end of the electric screw rod is in threaded connection with the plate tooth.

[0009] Further technical solution: The shaft end of the butterfly plate penetrates through the upper surface of the butterfly valve square pipe and is welded and installed inside the first protective shell. A first bevel gear is welded and installed on the upper surface of the first bevel gear. A column gear is welded and installed on the upper surface of the first bevel gear. The plate gear and the column gear are meshed and connected.

[0010] Further technical solution: Support blocks are symmetrically arranged on the upper surface of the butterfly valve square pipe. A linkage rod is rotatably installed on the inner surfaces of the two support blocks. A second bevel gear and a third bevel gear are respectively welded and installed at both ends of the linkage rod. The second bevel gear is arranged inside the first protective shell and meshed with the first bevel gear.

[0011] Further technical solution: The clamping unit includes a partition block. The partition block is fixedly installed in the inner cavity of the second protective shell and divides it into a first chamber and a second chamber. A threaded abutting rod is threadedly penetrated and installed on the outer surface of the partition block. A fourth chute is opened on the outer surface of the threaded abutting rod. A fifth bevel gear is slidably installed on the inner surface of the fourth chute through a second slider. A third spring is welded and installed on the lower surface of the fifth bevel gear.

[0012] Further technical solution: A second annular groove is opened on the upper surface of the partition block. A first ball is rotatably installed on the inner surface of the second annular groove. An annular plate is embedded and installed on the inner surface of the second annular groove. The first ball is installed between the second annular groove and the annular plate. The other end of the third spring is welded and installed on the upper surface of the annular plate.

[0013] Further technical solution: A column cylinder is fixedly installed on the inner surface of the first chamber inside the second protective shell. A fourth spring is welded and installed at one end of the threaded abutting rod. A second ball is welded and installed at the other end of the fourth spring and is arranged in the inner cavity opened in the column cylinder. The electric threaded rod is arranged in the second chamber inside the second protective shell and meshed with the threaded abutting rod.

[0014] Further technical solution: A first chute, a second chute and a first annular groove are opened on the inner surface of the butterfly valve square pipe. A third chute is opened on the inner surface of the second inner cavity inside the second protective shell. Second springs are welded and installed inside the inner parts of the second chute and the third chute respectively. An abutting block two is slidably installed in the second inner cavity inside the second protective shell. Slider ones are welded and installed on both side surfaces of the abutting block two and slide in the second chute and the third chute respectively. The other ends of the second springs are welded and installed on the outer surfaces of the slider ones.

[0015] Further technical solution: An annular sealing clamp is slidably installed in the first annular groove. A sliding column is slidably installed in the first chute. An abutting block one is welded and installed at the other end of the sliding column and is arranged in the second chamber inside the second protective shell. A first spring is welded and installed on one side surface of the abutting block one. The other end of the first spring is welded and installed on the surface of the second chamber inside.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] An eccentric butterfly valve of the present invention drives the second bevel gear to rotate through the first bevel gear in the driving unit and the clamping unit, so that the linkage rod rotates in the supporting block, thereby driving the third bevel gear to rotate. The third bevel gear drives the fifth bevel gear to rotate, so that the threaded resisting rod threadedly connected to the separating block moves downward in the separating block to abut against the second abutting block, so that the second abutting block moves downward on the lower side in the second chamber to abut against the first abutting block, so that the first abutting block slides to one side to abut against the sliding column, thereby abutting against the annular sealing clamp to seal and clamp the butterfly plate. It can ensure that there is no friction between the butterfly plate and the inner wall of the butterfly valve during rotation, thereby preventing the inner wall of the butterfly valve from being damaged and affecting the sealing performance between the butterfly plate and the inner wall of the butterfly valve, and can ensure the stability of the butterfly plate and will not be affected by water pressure or air pressure;

[0018] An eccentric butterfly valve of the present invention drives the limiting piece two on the sliding plate to slide towards the inner surface of the first protective shell through the electric screw rod in the driving unit and the plate teeth. The plate teeth drive the column teeth to rotate, and the column teeth drive the first bevel gear to rotate. A part of the first bevel gear drives the butterfly plate to rotate and close. The reverse rotation of the electric screw rod can drive the butterfly plate to open. The self-locking function of the electric screw rod in the driving unit can ensure the stability of the butterfly plate during rotation. At the same time, the first bevel gear in the driving unit drives the second bevel gear to rotate, so that the linkage rod rotates in the supporting block, thereby driving the third bevel gear to rotate, which is the driving effect for starting the clamping unit to realize the synchronous movement of the butterfly plate and the annular sealing clamp. Description of the Drawings

[0019] Figure 1 is the overall structural schematic diagram of the present invention;

[0020] Figure 2 is the overall sectional structural schematic diagram of the present invention;

[0021] Figure 3 is the sectional structural schematic diagram of the square pipe of the butterfly valve of the present invention;

[0022] Figure 4 is the sectional structural schematic diagram of the square pipe of the butterfly valve and the second protective shell of the present invention;

[0023] Figure 5 is the structural schematic diagram of the separating block and the threaded resisting rod of the present invention;

[0024] Figure 6 is the structural schematic diagram of the fifth bevel gear of the present invention;

[0025] Figure 7 is the sectional structural schematic diagram of the first protective shell of the present invention;

[0026] Figure 8 is the structural schematic diagram of the plate teeth of the present invention.

[0027] Description of the Reference Numerals:

[0028] 1. Butterfly valve square pipe; 2. First protective shell; 3. Second protective shell; 4. Limit angle block; 5. Butterfly plate;

[0029] 6. Driving unit; 601. Electric screw rod; 602. Sliding plate; 603. First limiting piece; 604. Second limiting piece; 605. Plate teeth; 606. First bevel gear; 607. Column teeth; 608. Support block; 609. Second bevel gear; 610. Third bevel gear; 611. Linking rod;

[0030] 7. Clamping unit; 701. First chute; 702. Second chute; 703. First annular groove; 704. Annular sealing clamp; 705. Slide post; 706. First abutting block; 707. First spring; 708. Third chute; 709. Second abutting block; 710. First slider; 711. Second spring; 712. Partition block; 713. Threaded abutting rod; 714. Second annular groove; 715. First ball; 716. Annular plate; 717. Fifth bevel gear; 718. Second slider; 719. Fourth chute; 720. Third spring; 721. Column cylinder; 722. Fourth spring; 723. Second ball. Detailed implementation mode

[0031] The following further describes the implementation mode of the present invention in detail in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0032] In the description of the present invention, unless otherwise specified, "a plurality of" means two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] As shown in the attached Figure 1 to the attached Figure 8As shown: The present invention provides an eccentric butterfly valve, including a butterfly valve square pipe 1. A first protective shell 2 is fixedly installed on the upper surface of the butterfly valve square pipe 1. Second protective shells 3 are fixedly installed on both side surfaces of the butterfly valve square pipe 1. Two limiting angle blocks 4 are welded and installed on the inner surface of the valve groove penetrating through the outer surface of the butterfly valve square pipe 1. A butterfly plate 5 is rotatably installed in the valve groove penetrating through the outer surface of the butterfly valve square pipe 1. A driving unit 6 is arranged on the outer surface of the butterfly valve square pipe 1 and inside the first protective shell 2. A clamping unit 7 is arranged on the outer surface of the butterfly valve square pipe 1 and inside the second protective shells 3.

[0035] In this embodiment, the valve groove penetrating through the butterfly valve square pipe 1 is a channel for controlling the flow of water or gas. Among them, the second protective shells 3 are symmetrically arranged on the surface of the butterfly valve square pipe 1. Both the first protective shell 2 and the second protective shells 3 protect the internal parts to achieve the effect of slowing down aging.

[0036] Preferably, the driving unit 6 includes a sliding plate 602. The sliding plate 602 is slidably installed on one side surface of the first protective shell 2. Among them, a first limiting piece 603 and a second limiting piece 604 are respectively welded and installed at both ends of the sliding plate 602. A plate tooth 605 is installed on one side surface of the second limiting piece 604. An electric screw rod 601 is fixedly installed on the other side surface of the first protective shell 2. Among them, the working end of the electric screw rod 601 is threadedly connected to the plate tooth 605.

[0037] In this embodiment, the sliding plate 602 can slide on one side surface of the first protective shell 2. Among them, the first limiting piece 603 and the second limiting piece 604 limit the maximum sliding distance of the plate tooth 605. The electric screw rod 601 drives the plate tooth 605 in a threaded manner so that the electric screw rod 601 can slide. Among them, the sliding plate 602 makes the plate tooth 605 more stable when sliding, and at the same time makes the electric screw rod 601 drive the plate tooth 605 to slide with a certain limitation.

[0038] Preferably, the shaft end of the butterfly plate 5 penetrates through the upper surface of the butterfly valve square pipe 1 and is arranged inside the first protective shell 2. A first bevel gear 606 is welded and installed. A column tooth 607 is welded and installed on the upper surface of the first bevel gear 606. The plate tooth 605 is meshed and connected with the column tooth 607.

[0039] In this embodiment, the plate tooth 605 drives the column tooth 607 to rotate, thereby driving the first bevel gear 606 to make the butterfly plate 5 rotate, so as to control the opening and closing of the butterfly plate 5. When the first limiting piece 603 is close to the outer side surface of the first protective shell 2, the butterfly plate 5 is in an open state. When the second limiting piece 604 is close to the inner side surface of the first protective shell 2, the butterfly plate 5 is in a closed state. Among them, the electric screw rod 601 has a self-locking function, which can make the butterfly plate 5 more stable in the open and closed states.

[0040] Preferably, support blocks 608 are symmetrically arranged on the upper surface of the butterfly valve square pipe 1. A linkage rod 611 is rotatably installed on the inner surfaces of the two support blocks 608. A second bevel gear 609 and a third bevel gear 610 are respectively welded and installed at both ends of the linkage rod 611. The second bevel gear 609 is arranged inside the first protective shell 2 and is meshed and connected with the first bevel gear 606.

[0041] In this embodiment, the rotation of the first bevel gear 606 can drive the rotation of the second bevel gear 609, causing the linkage rod 611 to rotate in the support block 608, thereby driving the rotation of the third bevel gear 610.

[0042] Preferably, the clamping unit 7 includes a partition block 712. The partition block 712 is fixedly installed in the inner cavity of the second protective shell 3 and is divided into a first chamber and a second chamber. A threaded abutting rod 713 is threadedly penetrated and installed on the outer surface of the partition block 712. A fourth chute 719 is formed on the outer surface of the threaded abutting rod 713. A fifth bevel gear 717 is slidably installed on the inner surface of the fourth chute 719 through a second slider 718. A third spring 720 is welded and installed on the lower surface of the fifth bevel gear 717.

[0043] In this embodiment, a part of the outer surface of the threaded abutting rod 713 has a threaded structure. The threaded abutting rod 713 is in a through-threaded connection with the partition block 712. The fifth bevel gear 717 can slide in the threaded abutting rod 713 through the second slider 718 and the fourth chute 719, and does not affect the normal rotation of the threaded abutting rod 713. The third spring 720 always abuts against the fifth bevel gear 717, causing the fifth bevel gear 717 to always be in the upper position in the fourth chute 719. No matter where the threaded abutting rod 713 threadedly moves downward in the partition block 712, the fifth bevel gear 717 always remains meshed and connected with the third bevel gear 610.

[0044] Preferably, a second annular groove 714 is formed on the upper surface of the partition block 712. A first ball 715 is rotatably installed on the inner surface of the second annular groove 714. An annular plate 716 is embedded and installed on the inner surface of the second annular groove 714. The first ball 715 is installed between the second annular groove 714 and the annular plate 716. The other end of the third spring 720 is welded and installed on the upper surface of the annular plate 716.

[0045] In this embodiment, one end of the third spring 720 is welded and installed on the lower surface of the fifth bevel gear 717, and the other end is welded and installed on the upper surface of the annular plate 716. The annular plate 716 can rotate in the second annular groove 714 through the first ball 715, so that the third spring 720 can rotate, ensuring that while the threaded abutting rod 713 rotates, it does not affect the normal work of the third spring 720 abutting against the fifth bevel gear 717.

[0046] Preferably, a cylinder 721 is fixedly installed on the inner surface of the first chamber inside the second protective shell 3. One end of the threaded abutting rod 713 is welded with a fourth spring 722. The other end of the fourth spring 722 is welded with a second ball 723 arranged in the inner cavity opened in the cylinder 721. The electric threaded rod 601 is arranged in the second chamber inside the second protective shell 3 and is meshed and connected with the threaded abutting rod 713.

[0047] In this embodiment, one end of the threaded abutting rod 713 is welded with a fourth spring 722. One end of the fourth spring 722 is embedded with a second ball 723. One end of the threaded abutting rod 713 is in the inner cavity of the cylinder 721, which can ensure the stability of the threaded abutting rod 713 when rotating. At the same time, the arranged second ball 723 can ensure the smooth rotation of the threaded abutting rod 713.

[0048] Preferably, a first chute 701, a second chute 702 and a first annular groove 703 are opened on the inner surface of the butterfly valve square pipe 1. A third chute 708 is opened on the inner surface of the second inner cavity inside the second protective shell 3. Second springs 711 are welded and installed inside the second chute 702 and the third chute 708. A second abutting block 709 is slidably installed in the second inner cavity inside the second protective shell 3. Sliders 710 are welded and installed on both side surfaces of the second abutting block 709 and slide in the second chute 702 and the third chute 708 respectively. The other ends of the second springs 711 are welded and installed on the outer surfaces of the sliders 710.

[0049] In this embodiment, the second springs 711 welded and installed inside the second chute 702 and the third chute 708 always pull upward the sliders 710 welded and installed on both side surfaces of the second abutting block 709, always making the second abutting block 709 above the second inner cavity inside the second protective shell 3.

[0050] Preferably, an annular sealing clip 704 is slidably installed in the first annular groove 703. A sliding column 705 is slidably installed in the first chute 701. The other end of the sliding column 705 is welded with a first abutting block 706 arranged in the second chamber inside the second protective shell 3. A first spring 707 is welded and installed on one side surface of the first abutting block 706. The other end of the first spring 707 is welded and installed on the surface of the second chamber inside.

[0051] In this embodiment, the first spring 707 pulls the first abutting block 706, so that the sliding column 705 pulls the annular sealing clip 704, making the annular sealing clip 704 always inside the first annular groove 703.

[0052] Specific usage method of the present invention: When it is necessary to close the butterfly plate 5, first, the electric screw rod 601 needs to be started. At this time, the working end of the electric screw rod 601 drives the plate teeth 605, causing the limiting piece two 604 on the sliding plate 602 to slide towards the inner surface of the first protective shell 2. At this time, the plate teeth 605 drive the column teeth 607 to rotate, and the column teeth 607 drive the first bevel gear 606 to rotate. A part of the first bevel gear 606 drives the butterfly plate 5 to rotate and close;

[0053] Meanwhile, the first bevel gear 606 drives the second bevel gear 609 to rotate, causing the linkage rod 611 to rotate in the support block 608, thereby driving the third bevel gear 610 to rotate. The third bevel gear 610 drives the fifth bevel gear 717 to rotate, causing the threaded abutting rod 713 threadedly connected to the partition block 712 to move downward in the partition block 712. At the same time, the third spring 720 will always resist the up and down movement of the fifth bevel gear 717, keeping the fifth bevel gear 717 in contact with the third bevel gear 610 to ensure normal meshing connection. Then, the threaded abutting rod 713 moves downward to abut against the second abutting block 709, causing the second abutting block 709 to move downward in the second chamber to abut against the first abutting block 706, causing the first abutting block 706 to slide to one side to abut against the sliding column 705, thereby abutting against the annular sealing clip 704 to tightly clamp and seal the butterfly plate 5;

[0054] If it needs to be opened, reverse the rotation of the electric screw rod 601, causing the limiting piece one 603 in the sliding plate 602 to move towards the outer surface of the first protective shell 2, and that's it.

[0055] The examples of the present invention are given for purposes of illustration and description, and are not exhaustive or limit the present invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are chosen and described in order to better explain the principles of the present invention and its practical applications, and to enable those of ordinary skill in the art to understand the present invention and design various embodiments with various modifications suitable for specific purposes.

Claims

1. An eccentric butterfly valve, comprising a butterfly valve square tube (1), characterized in that: A protective shell 1 (2) is fixedly installed on the upper surface of the butterfly valve square tube (1), and a protective shell 2 (3) is fixedly installed on the two side surfaces of the butterfly valve square tube (1). Two limiting angle blocks (4) are welded and installed on the inner surface of the valve groove that passes through the outer surface of the butterfly valve square tube (1). A butterfly plate (5) is rotatably installed in the valve groove that passes through the outer surface of the butterfly valve square tube (1). A driving unit (6) is arranged on the outer surface of the butterfly valve square tube (1) and inside the protective shell 1 (2), and a clamping unit (7) is arranged on the outer surface of the butterfly valve square tube (1) and inside the protective shell 2 (3).

2. An eccentric butterfly valve according to claim 1, characterized in that: The driving unit (6) comprises a sliding plate (602), wherein the sliding plate (602) is slidably mounted on a side surface of the protective shell (2), wherein a limiting plate (603) and a limiting plate (604) are respectively welded and mounted on both ends of the sliding plate (602), a plate tooth (605) is mounted on a side surface of the limiting plate (604), and an electric threaded rod (601) is fixedly mounted on the other side surface of the protective shell (2), wherein the working end of the electric threaded rod (601) is threadedly connected to the plate tooth (605).

3. An eccentric butterfly valve according to claim 2, characterized in that: The axial end of the butterfly plate (5) passes through the upper surface of the butterfly valve square tube (1) and is arranged inside the protective shell (2) and is welded with a bevel gear (606). The upper surface of the bevel gear (606) is welded with a column gear (607). The plate gear (605) and the column gear (607) are meshed and connected.

4. An eccentric butterfly valve according to claim 3, characterized in that: The upper surface of the butterfly valve square tube (1) is symmetrically provided with support blocks (608), and the inner surfaces of the two support blocks (608) are rotatably provided with linkage rods (611), and the two ends of the linkage rods (611) are respectively welded with bevel gear 2 (609) and bevel gear 3 (610), wherein the bevel gear 2 (609) is arranged inside the protective shell 1 (2) and meshed with the bevel gear 1 (606).

5. An eccentric butterfly valve according to claim 4, characterized in that: The clamping unit (7) includes a partition block (712), which is fixedly installed in the inner cavity of the protective shell (3) to divide the first chamber into the second chamber, and the outer surface of the partition block (712) is threadedly penetrated by a threaded push rod (713), and the outer surface of the threaded push rod (713) is provided with a slide groove (719), and the inner surface of the slide groove (719) is slidably installed with a bevel tooth (717) through a slider (718), and the lower surface of the bevel tooth (717) is welded with a spring (720).

6. An eccentric butterfly valve according to claim 5, characterized in that: The upper surface of the partition block (712) is provided with an annular groove 2 (714), the inner surface of the annular groove 2 (714) is rollingly mounted with a ball 1 (715), the inner surface of the annular groove 2 (714) is embedded with an annular plate (716), the ball 1 (715) is mounted between the annular groove 2 (714) and the annular plate (716), and the other end of the spring 3 (720) is welded and mounted on the upper surface of the annular plate (716).

7. An eccentric butterfly valve according to claim 6, characterized in that: A column (721) is fixedly mounted on the inner surface of the first chamber inside the second protective shell (3); a spring (722) is welded to one end of the threaded push rod (713); a ball (723) is welded to the other end of the spring (722) and is arranged in the inner cavity opened by the column (721); the electric threaded rod (601) is arranged in the second chamber inside the second protective shell (3) and is meshedly connected with the threaded push rod (713).

8. An eccentric butterfly valve according to claim 7, characterized in that: The inner surface of the butterfly valve square tube (1) is provided with a slide groove 1 (701), a slide groove 2 (702) and an annular groove 1 (703); the inner surface of the second inner cavity inside the protective shell 2 (3) is provided with a slide groove 3 (708); the inner sides of the slide groove 2 (702) and the slide groove 3 (708) are both welded with a spring 2 (711); a stop block 2 (709) is slidably installed in the second inner cavity inside the protective shell 2 (3); both sides of the stop block 2 (709) are welded with a slider 1 (710) which slides in the slide groove 2 (702) and the slide groove 3 (708) respectively; the other end of the spring 2 (711) is welded and installed on the outer surface of the slider 1 (710).

9. An eccentric butterfly valve according to claim 8, characterized in that: An annular sealing clamp (704) is slidably installed in the annular groove (703), a sliding column (705) is slidably installed in the sliding groove (701), and a stop block (706) is welded and installed on the other end of the sliding column (705) and is arranged in the second chamber inside the protective shell (3). A spring (707) is welded and installed on the surface of one side of the stop block (706), and the other end of the spring (707) is welded and installed on the surface of the second chamber inside.

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