Double-seal center line-type butterfly valve structure

Abstract

The utility model relates to a double-seal center line-type butterfly valve structure which comprises a valve body, the top face of the valve body is connected with a valve rod in a rotating mode, the bottom end of the valve rod extends into the valve body, a butterfly plate is fixed on the peripheral wall of the valve rod, two supporting plates distributed front and back are fixed at the top end of the valve rod, and a handle is connected between the two supporting plates in a rotating mode. In the using process, the valve rod can be easily driven to rotate through the arranged handle to achieve the opening and closing purposes, when the handle is rotated, the handle needs to be turned upwards to incline by a certain angle so that locking of the limiting assembly on the valve rod can be removed, and the valve rod can be effectively limited and fixed through the arranged limiting assembly; in addition, the butterfly plate is sealed with the valve body through the arranged sealing assembly, the sealing assembly is of a double-sealing structure, the sealing effect of the butterfly plate can be greatly improved, the closing effect of the butterfly valve is guaranteed, practicability is better, and application and popularization are more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of center line butterfly valves, in particular to a double-sealed center line butterfly valve structure. Background Art

[0002] The centerline butterfly valve is a component used to realize the on-off and flow control of the pipeline system. It is composed of a valve body, a butterfly plate, a valve stem and a handle. Turning the handle can drive the butterfly plate to rotate in the water hole through the valve stem. Once the outer circumference of the butterfly plate completely contacts the wall of the water hole, the valve is closed. Once the outer circumference of the butterfly plate loses contact with the wall of the water hole, the valve is opened.

[0003] For example, a Chinese patent (publication number: CN 212959890 U) discloses a manual butterfly valve, including a valve body, an annular sealing rubber ring, a linkage shaft, a rotary valve plate and a rotary handle arranged on the outside of the valve body and fixed to the linkage shaft, the linkage shaft separates the annular sealing rubber ring to form a first semicircular sealing rubber ring and a second semicircular sealing rubber ring located on both sides of the linkage shaft, the first semicircular sealing rubber ring and the second semicircular sealing rubber ring are respectively provided with a first protrusion and a second protrusion for limiting the rotation of the rotary valve plate, the annular sealing rubber ring, the first protrusion, the second protrusion are fitted with the surface of the rotary valve plate, so that the rotary valve plate and the annular sealing rubber ring are effectively fitted and contacted, thereby improving the sealing performance of the manual butterfly valve.

[0004] However, the above-mentioned search patent still has some shortcomings. Its rotating handle is equivalent to adding a micro lever when driving the rotating valve plate to rotate, thereby reducing the torque for closing the butterfly valve and facilitating the rotation of the valve plate. However, the rotating handle is not provided with a limit structure for locking the limit, so it is easy to accidentally touch and cause the rotating handle to rotate, which is inconvenient to use. Therefore, a double-sealed centerline butterfly valve structure is proposed to solve the above problem. Utility Model Content

[0005] In view of the shortcomings of the prior art, the utility model provides a double-sealed centerline butterfly valve structure, which has the advantages of convenient operation and can avoid accidental touch causing the valve to switch, etc., solving the problem that the rotary handle is easily rotated due to accidental touch in the above-mentioned search patent.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a double-sealed centerline butterfly valve structure, comprising a valve body, the top surface of the valve body is rotatably connected to a valve stem extending from the bottom end to the inside of the valve body, a butterfly plate is fixed on the outer peripheral wall of the valve stem, two support plates distributed front and back are fixed to the top of the valve stem, a handle is rotatably connected between the two support plates, a limit assembly is provided on the valve body, and a sealing assembly is provided on the butterfly plate;

[0007] The limit assembly includes a circular cylinder fixed on the top surface of the valve body, a receiving groove is provided in the valve stem, a connecting rod with a bottom end extending to the inside of the receiving groove is slidably connected to the top surface of the valve stem, a truncated cone block is fixed on the outer peripheral wall of the connecting rod, an insertion rod with one end extending to the inside of the receiving groove is slidably connected to the outer peripheral wall of the valve stem, a trapezoidal block is fixed on the opposite ends of the two insertion rods, a first spring is fixed on the opposite side of the two trapezoidal blocks, a second spring is fixed on the bottom surface of the truncated cone block, and a plurality of slots are provided on the inner peripheral wall of the circular cylinder.

[0008] Furthermore, the sealing assembly includes an annular plate fixed on the outer peripheral wall of the butterfly plate, a first sealing groove is opened on the outer peripheral wall of the annular plate, a first sealing ring is fixed in the first sealing groove, and two second sealing grooves distributed front and back are opened on the outer peripheral wall of the butterfly plate, and a second sealing ring is fixed in the second sealing groove.

[0009] Furthermore, the handle is rotatably connected to the support plate via a hinge shaft, and the hinge shaft is close to the upper right side of the support plate. The bottom end of the valve stem is rotatably connected to the inner bottom wall of the valve body. A sealing ring is fixed on the outer peripheral wall of the valve stem and above the butterfly plate.

[0010] Furthermore, a circular hole is provided on the top surface of the circular cylinder for the valve stem to vertically penetrate and be rotatably connected thereto, the valve stem, the circular cylinder and the connecting rod are all located on the same central axis, and the plurality of slots are equidistantly distributed along the circumferential direction of the circular cylinder.

[0011] Furthermore, a sliding hole is provided on the top surface of the valve stem for the connecting rod to pass through and be slidably connected thereto, a guide hole is provided on the outer peripheral wall of the valve stem for the insertion rod to be slidably connected thereto, and the insertion rod and the slot are located on the same horizontal line and the two are clearance-matched.

[0012] Furthermore, the elastic coefficient of the second spring is greater than the elastic coefficient of the first spring, and the side of the first spring facing away from the trapezoidal block is fixed to the inner peripheral wall of the accommodating groove.

[0013] Furthermore, the annular plate is located between the two second sealing grooves, and opposite sides of the two second sealing rings are in contact with the annular plate.

[0014] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0015] The double-sealed centerline butterfly valve structure can easily drive the valve stem to rotate through the provided handle when in use, and the valve stem drives the butterfly plate to rotate to achieve the purpose of opening and closing. When rotating the handle, it is necessary to flip it upward and tilt it at a certain angle to release the lock of the valve stem by the limit assembly. The valve stem can be effectively limited and fixed by the provided limit assembly, thereby avoiding the inconvenience caused by opening or closing the butterfly valve due to accidental impact of the handle. In addition, the butterfly plate is sealed with the valve body through the provided sealing assembly. The sealing assembly is a double sealing structure, which can greatly improve the sealing effect of the butterfly plate, thereby ensuring the closing effect of the butterfly valve. It is more practical and easier to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 It is a front view schematic diagram of the limit assembly of the utility model;

[0018] Figure 3 It is a top view schematic diagram of the sealing assembly of the utility model.

[0019] In the figure: 1 valve body, 2 valve stem, 3 butterfly plate, 4 support plate, 5 handle, 6 limit assembly, 601 circular cylinder, 602 accommodating groove, 603 connecting rod, 604 truncated table block, 605 plug rod, 606 trapezoidal block, 607 first spring, 608 second spring, 609 slot, 7 sealing assembly, 701 annular plate, 702 first sealing groove, 703 first sealing ring, 704 second sealing groove, 705 second sealing ring. DETAILED DESCRIPTION

[0020] 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.

[0021] See also Figure 1-2A double-sealed centerline butterfly valve structure in this embodiment includes a valve body 1, the top surface of the valve body 1 is rotatably connected with a valve stem 2 whose bottom end extends into the interior of the valve body 1, a butterfly plate 3 is fixed on the outer peripheral wall of the valve stem 2, and two support plates 4 distributed front and back are fixed to the top of the valve stem 2, a handle 5 is rotatably connected between the two support plates 4, the handle 5 is rotatably connected to the support plate 4 through a hinge shaft, and the hinge shaft is close to the upper right side of the support plate 4, the bottom end of the valve stem 2 is rotatably connected to the inner bottom wall of the valve body 1, a sealing ring is fixed on the outer peripheral wall of the valve stem 2 and above the butterfly plate 3, the connection between the valve stem 2 and the valve body 1 is sealed by the provided sealing ring, and when in use, the provided handle 5 can be used to The valve stem 2 can be easily driven to rotate, and the valve stem 2 drives the butterfly plate 3 to rotate to achieve the purpose of opening and closing. A limit assembly 6 is provided on the valve body 1. When the handle 5 is rotated, it is necessary to flip it upward and tilt it at a certain angle to release the lock of the valve stem 2 by the limit assembly 6. The valve stem 2 can be effectively limited and fixed by the set limit assembly 6, thereby avoiding the inconvenience caused by opening or closing the butterfly valve due to accidental impact on the handle 5. A sealing assembly 7 is provided on the butterfly plate 3, and the butterfly plate 3 is sealed with the valve body 1 through the set sealing assembly 7. The sealing assembly 7 is a double sealing structure, which can greatly improve the sealing effect of the butterfly plate 3, thereby ensuring the closing effect of the butterfly valve, and has better practicality and is more convenient for promotion and use.

[0022] The limit assembly 6 includes a circular cylinder 601 fixed on the top surface of the valve body 1, a receiving groove 602 is provided in the valve stem 2, a connecting rod 603 with a bottom end extending to the inside of the receiving groove 602 is slidably connected to the top surface of the valve stem 2, a truncated block 604 is fixed to the outer peripheral wall of the connecting rod 603, and an insert rod 605 with one end extending to the inside of the receiving groove 602 is slidably connected to the outer peripheral wall of the valve stem 2, and a trapezoidal block 606 is fixed to the opposite ends of the two insert rods 605. When the valve stem 2 needs to be rotated, hold the handle 5 The handle 5 is turned upward near the right end and tilted to a certain angle. The handle 5 is connected to the support plate 4 by a hinge shaft, so that the handle 5 is turned downward near the left end and pushes the connecting rod 603 to move downward. The connecting rod 603 pushes the truncated cone block 604 to move downward and disengage from the two trapezoidal blocks 606. The two trapezoidal blocks 606 are fixed with a first spring 607 on the opposite side. The bottom surface of the truncated cone block 604 is fixed with a second spring 608. The elastic coefficient of the second spring 608 is greater than the elastic coefficient of the first spring 607. The side of the first spring 607 away from the trapezoidal block 606 is fixed to the inner circumferential wall of the accommodating groove 602. A plurality of slots 609 are provided on the inner circumferential wall of the circular cylinder 601. Further, the truncated cone block 604 moves downward and disengages from the two trapezoidal blocks 606. The two first springs 607 push the two trapezoidal blocks 606 to move relative to each other. The two trapezoidal blocks 606 drive the two plug rods 605 to move relative to each other and disengage from the slots 609. At this time, the handle 5 can be rotated to drive the valve stem 2 to rotate. When the truncated cone block 604 moves downward, it will squeeze the second spring 608. Since the elastic coefficient of the second spring 608 is greater than the elastic coefficient of the first spring 607, when the handle 5 is released, the connecting rod 603 loses the downward pressure. At this time, the second spring 608 pushes the truncated cone block 604 to move upward and insert it between the two trapezoidal blocks 606, thereby compressing the first spring 607 and inserting the insertion rod 605 into the corresponding slot 609, thereby limiting and locking the valve stem 2 to prevent accidental touch from causing the valve stem 2 to rotate.

[0023] A circular hole is provided on the top surface of the circular cylinder 601 for the valve stem 2 to pass vertically and be rotatably connected thereto. The valve stem 2, the circular cylinder 601 and the connecting rod 603 are all located on the same central axis. A plurality of slots 609 are evenly distributed along the circumferential direction of the circular cylinder 601. Such a structure allows the insertion rod 605 to be inserted into the slot 609 after it revolves around the valve stem 2. A sliding hole is provided on the top surface of the valve stem 2 for the connecting rod 603 to pass through and be slidably connected thereto. A guide hole is provided on the outer peripheral wall of the valve stem 2 for the insertion rod 605 to be slidably connected thereto. The insertion rod 605 and the slot 609 are located on the same horizontal line and the clearance between the two is matched.

[0024] See also Figure 3In this embodiment, the sealing assembly 7 includes an annular plate 701 fixed on the outer peripheral wall of the butterfly plate 3, a first sealing groove 702 is provided on the outer peripheral wall of the annular plate 701, a first sealing ring 703 is fixed in the first sealing groove 702, two second sealing grooves 704 distributed front and back are provided on the outer peripheral wall of the butterfly plate 3, a second sealing ring 705 is fixed in the second sealing groove 704, the annular plate 701 is located between the two second sealing grooves 704, and the two second sealing rings 705 are opposite to each other. The first and second sealing rings 705 are in contact with the annular plate 701 on both sides. When the valve stem 2 rotates, the butterfly plate 3 is driven to rotate. When the outer circumferential wall of the butterfly plate 3 abuts against the inner circumferential wall of the valve body 1, the first sealing ring 703 and the second sealing ring 705 are in contact with the inner wall of the valve body 1, which has a double sealing effect on the gap between the butterfly plate 3 and the valve body 1. The opposing surfaces of the two second sealing rings 705 are supported by the annular plate 701, which can better make the outer circumferential wall of the second sealing ring 705 abut against the inner circumferential wall of the valve body 1 to ensure the sealing.

[0025] The working principle of the above embodiment is:

[0026] When the valve stem 2 needs to be rotated, the handle 5 is held and tilted upward at a certain angle near the right end. The handle 5 is connected to the support plate 4 by a hinge shaft, so that the handle 5 is tilted downward near the left end and pushes the connecting rod 603 to move downward. The connecting rod 603 pushes the truncated cone block 604 to move downward and disengage from between the two trapezoidal blocks 606, so that the two first springs 607 push the two trapezoidal blocks 606 to move relative to each other. The two trapezoidal blocks 606 drive the two plug rods 605 to move relative to each other and disengage from the slots 609. At this time, the valve stem 2 can be rotated. The handle 5 drives the valve stem 2 to rotate, and when the truncated cone block 604 moves downward, it will squeeze the second spring 608. Since the elastic coefficient of the second spring 608 is greater than the elastic coefficient of the first spring 607, when the handle 5 is released, the connecting rod 603 loses the downward pressure. At this time, the second spring 608 pushes the truncated cone block 604 to move upward and insert it between the two trapezoidal blocks 606, thereby compressing the first spring 607 and inserting the insertion rod 605 into the corresponding slot 609, thereby limiting and locking the valve stem 2 to prevent accidental touch from causing the valve stem 2 to rotate.

[0027] When the valve stem 2 rotates, the butterfly plate 3 is driven to rotate. When the outer circumferential wall of the butterfly plate 3 abuts against the inner circumferential wall of the valve body 1, the first sealing ring 703 and the second sealing ring 705 are in contact with the inner wall of the valve body 1, which has a double sealing effect on the gap between the butterfly plate 3 and the valve body 1. The opposing surfaces of the two second sealing rings 705 are supported by the annular plate 701, which can better make the outer circumferential wall of the second sealing ring 705 abut against the inner circumferential wall of the valve body 1 to ensure the sealing.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-sealed centerline butterfly valve structure, comprising a valve body (1), characterized in that: The top surface of the valve body (1) is rotatably connected to a valve stem (2) whose bottom end extends into the interior of the valve body (1); a butterfly plate (3) is fixed to the outer peripheral wall of the valve stem (2); two support plates (4) distributed front and back are fixed to the top of the valve stem (2); a handle (5) is rotatably connected between the two support plates (4); a limit assembly (6) is provided on the valve body (1); and a sealing assembly (7) is provided on the butterfly plate (3); The limit assembly (6) includes a circular cylinder (601) fixed on the top surface of the valve body (1), a receiving groove (602) is provided in the valve stem (2), the top surface of the valve stem (2) is slidably connected to a connecting rod (603) whose bottom end extends to the inside of the receiving groove (602), a truncated cone block (604) is fixed on the outer peripheral wall of the connecting rod (603), an insertion rod (605) whose one end extends to the inside of the receiving groove (602) is slidably connected to the outer peripheral wall of the valve stem (2), a trapezoidal block (606) is fixed on the opposite ends of the two insertion rods (605), a first spring (607) is fixed on the opposite sides of the two trapezoidal blocks (606), a second spring (608) is fixed on the bottom surface of the truncated cone block (604), and a plurality of slots (609) are provided on the inner peripheral wall of the circular cylinder (601).

2. A double-sealed centerline butterfly valve structure according to claim 1, characterized in that: The sealing assembly (7) comprises an annular plate (701) fixed on the outer peripheral wall of the butterfly plate (3); a first sealing groove (702) is provided on the outer peripheral wall of the annular plate (701); a first sealing ring (703) is fixed in the first sealing groove (702); two second sealing grooves (704) distributed in a front-to-rear manner are provided on the outer peripheral wall of the butterfly plate (3); a second sealing ring (705) is fixed in the second sealing groove (704).

3. A double-sealed centerline butterfly valve structure according to claim 1, characterized in that: The handle (5) is rotatably connected to the support plate (4) via a hinge shaft, and the hinge shaft is close to the upper right side of the support plate (4). The bottom end of the valve stem (2) is rotatably connected to the inner bottom wall of the valve body (1). A sealing ring is fixed on the outer peripheral wall of the valve stem (2) and located above the butterfly plate (3).

4. A double-sealed centerline butterfly valve structure according to claim 1, characterized in that: The top surface of the circular cylinder (601) is provided with a circular hole for the valve stem (2) to vertically penetrate and be rotatably connected thereto; the valve stem (2), the circular cylinder (601) and the connecting rod (603) are all located on the same central axis; and the plurality of slots (609) are equidistantly distributed along the circumferential direction of the circular cylinder (601).

5. The double-sealed centerline butterfly valve structure according to claim 1 is characterized in that: The top surface of the valve stem (2) is provided with a sliding hole for the connecting rod (603) to pass through and be slidably connected thereto, and the outer peripheral wall of the valve stem (2) is provided with a guide hole for the insertion rod (605) to be slidably connected thereto, and the insertion rod (605) and the slot (609) are located on the same horizontal line and the two are clearance-matched.

6. A double-sealed centerline butterfly valve structure according to claim 1, characterized in that: The elastic coefficient of the second spring (608) is greater than the elastic coefficient of the first spring (607), and the side of the first spring (607) facing away from the trapezoidal block (606) is fixed to the inner peripheral wall of the accommodating groove (602).

7. A double-sealed centerline butterfly valve structure according to claim 2, characterized in that: The annular plate (701) is located between the two second sealing grooves (704), and opposite sides of the two second sealing rings (705) are in contact with the annular plate (701).

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