Triple-eccentric hard sealing butterfly valve

Abstract

The utility model relates to the technical field of butterfly valves, in particular to a triple-eccentric hard sealing butterfly valve which comprises a valve body, a first valve plate, a first valve rod, a second valve plate and a second valve rod, the second valve rod is rotatably arranged on the first valve rod, a through hole is formed in the middle of the first valve plate, the second valve plate is arranged in the through hole and fixedly connected with one end of the second valve rod, and the second valve rod is arranged in the through hole. The other end of the second valve rod extends out of the first valve rod and is connected with an actuator. An outer spline is arranged at the upper end of the second valve rod, a counter bore is formed in the upper end of the first valve rod, an inner spline is arranged in the counter bore, a spline sleeve is arranged between the first valve rod and the second valve rod and slidably arranged on the second valve rod, the inner side of the spline sleeve is connected with a spline of the second valve rod, and a spline shaft matched with the counter bore is arranged on the outer side of the spline sleeve. The double-valve-plate structure is arranged, the first valve plate or the second valve plate can be selectively opened according to needs, the requirement for large-flow fluid conveying can be met, and flow can be accurately controlled during small-flow adjustment.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves, and more specifically to a three-eccentric hard-sealed butterfly valve. Background Art

[0002] In traditional valve design, especially large-diameter butterfly valves, the main function is to quickly open or close large-flow fluid channels to meet the large-volume fluid delivery needs in industries such as water conservancy, petrochemicals, and metallurgy. Butterfly valves are widely used for their simple structure, small size, light weight, and easy installation. However, when it comes to small flow regulation, their inherent flow characteristics become a major challenge.

[0003] The relationship between the flow rate and the opening of a butterfly valve is not a simple linear one. Especially when the opening is small, the flow change is very sensitive to the change in the opening, which makes it difficult to achieve precise control when adjusting small flows.

[0004] Therefore, it is necessary to improve the prior art. Utility Model Content

[0005] In order to overcome the deficiencies in the prior art, a three-eccentric hard-sealed butterfly valve with a double valve plate structure is provided, in which a large valve plate or a small valve plate can be opened according to demand to provide more precise flow control.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A three-eccentric hard-sealed butterfly valve, comprising a valve body, a first valve plate and a first valve stem, wherein a medium hole is arranged on the valve body, the first valve stem is rotatably arranged on the valve body and extends into the medium hole, the first valve plate is arranged in the medium hole and is fixedly connected to the first valve stem; further comprising a second valve plate and a second valve stem, the second valve stem is rotatably arranged in the first valve stem, a through hole is arranged in the middle of the first valve plate, the second valve plate is arranged in the through hole and is fixedly connected to one end of the second valve stem, the other end of the second valve stem extends outside the first valve stem and is connected to an actuator;

[0008] The upper end of the second valve stem is provided with an external spline, the upper end of the first valve stem is provided with a countersunk hole, the countersunk hole is provided with an internal spline, a spline sleeve is provided between the first valve stem and the second valve stem, the spline sleeve is slidably provided on the second valve stem, the inner side of the spline sleeve is spline-connected with the second valve stem, and the outer side of the spline sleeve is provided with a spline shaft matching the countersunk hole.

[0009] Preferably, the second valve stem is provided with an upper socket and a lower socket along the length direction, the spline sleeve is provided with a pin for radial sliding, and one end of the pin close to the second valve stem is inserted into the upper socket or the lower socket.

[0010] A locking structure is provided between the first valve stem and the valve body.

[0011] Preferably, detachable valve seats are provided in the medium hole and the through hole, and valve plate sealing rings cooperating with corresponding valve seats are respectively provided on the outer edges of the first valve plate and the second valve plate.

[0012] Preferably, the valve plate sealing ring is arranged on the first valve plate or the second valve plate through a valve plate pressure ring.

[0013] Preferably, a sealing structure is provided between the first valve stem and the valve body, and between the second valve stem and the first valve stem.

[0014] Preferably, the actuator is a hand wheel.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. The utility model sets a double valve plate structure, and can choose to open the first valve plate or the second valve plate according to the needs, which can not only meet the needs of large flow fluid delivery, but also can accurately control the flow when adjusting small flow.

[0017] 2. The first valve stem and the second valve stem of the utility model are driven by the same actuator, which reduces the driving difficulty. A detachable sealing structure is provided between the first valve plate and the medium hole and between the second valve plate and the second valve plate, which improves the sealing degree and reduces the difficulty of replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The specific implementation of the utility model will be further described in detail below with reference to the accompanying drawings.

[0019] Figure 1 It is a cross-sectional view of the utility model;

[0020] Figure 2 for Figure 1 A partial enlarged view of middle A;

[0021] Figure 3 for Figure 1 A partial enlarged view of B.

[0022] In the figure: 1-valve body, 2-first valve plate, 3-first valve stem, 4-second valve plate, 5-second valve stem, 6-through hole, 7-actuator, 8-external spline, 9-countersunk hole, 10-spline sleeve, 11-spline shaft, 12-upper plug hole, 13-lower plug hole, 14-pin shaft, 15-valve seat, 16-valve plate sealing ring, 17-valve plate pressure ring. DETAILED DESCRIPTION

[0023] 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.

[0024] like Figures 1 to 3 As shown, a three-eccentric hard-sealed butterfly valve includes a valve body 1, a first valve plate 2 and a first valve stem 3. A medium hole is provided on the valve body 1. The first valve stem 3 is rotatably provided on the valve body 1 and extends into the medium hole. The first valve plate 2 is provided in the medium hole and is fixedly connected to the first valve stem 3. The second valve plate 2 is driven by the first valve stem 3 to realize the opening and closing of the medium hole.

[0025] In order to control the medium with a small flow rate, a second valve plate 4 and a second valve stem 5 are further provided on the basis of the above structure. A through hole 6 is provided in the middle of the first valve plate 2. The second valve plate 4 is rotatably provided in the through hole 6 to block the through hole 6. The second valve stem 5 is rotatably provided in the first valve stem 3. The upper end of the second valve stem 5 extends outside the first valve stem 3 and is connected to an actuator 7. Preferably, the actuator 7 is a hand wheel, or an electric actuator. The lower end of the second valve stem 5 is fixedly connected to the second valve plate 4.

[0026] In order to enable the actuator 7 to drive both the first valve stem and the second valve stem, an external spline 8 is provided at the upper end of the second valve stem 5, a countersunk hole 9 is provided at the upper end of the first valve stem 3, an internal spline is provided in the countersunk hole 9, a spline sleeve 10 is provided between the first valve stem 3 and the second valve stem 5, the spline sleeve 10 is slidably provided on the second valve stem 5, the inner side of the spline sleeve 10 is always matched with the external spline of the second valve stem 5, and a spline shaft 11 matched with the countersunk hole 9 is provided on the outer side of the spline sleeve 10. When the spline sleeve 10 is inserted into the countersunk hole 9, the actuator 7 can drive the first valve stem 3 and the second valve stem 5 to rotate at the same time; when the spline sleeve 10 leaves the countersunk hole 9, the actuator 7 only controls the second valve stem 5.

[0027] When the spline sleeve 10 leaves the counterbore 9, in order to prevent the first valve stem 3 from moving disorderly, a locking structure 18 should be provided between the first valve stem 3 and the valve body 1. When the outer edge of the first valve plate 2 is sealed with the medium hole, the position of the first valve stem 3 is locked by the locking structure. Preferably, the locking structure can adopt a pin shaft.

[0028] In order to lock the position of the spline sleeve 10, the second valve stem 5 is provided with an upper plug hole 12 and a lower plug hole 13 along the length direction, and the spline sleeve 10 is provided with a pin shaft 14 slidingly arranged in the radial direction, and the end of the pin shaft 14 close to the second valve stem 5 is inserted into the upper plug hole 12 or the lower plug hole 13. When the pin shaft 14 is inserted into the upper plug hole 12, the spline sleeve 10 leaves the countersunk hole 9, and when the pin shaft 14 is inserted into the lower plug hole 13, the spline sleeve 10 is located in the countersunk hole 9 and is splined with the countersunk hole 9.

[0029] A detachable valve seat 15 is provided in the medium hole and the through hole 6. The outer edges of the first valve plate 2 and the second valve plate 4 are respectively provided with valve plate sealing rings 16 that cooperate with the corresponding valve seats 15. The valve plate sealing ring 16 is arranged on the first valve plate 2 or the second valve plate 4 through a valve plate pressure ring 17.

[0030] Preferably, a sealing structure is provided between the first valve stem 3 and the valve body 1 , and between the second valve stem 5 and the first valve stem 3 , to prevent leakage of the medium from the valve stem.

[0031] Only the preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention, and various changes should be included in the protection scope of the present invention.

Claims

1. A triple-eccentric hard-sealed butterfly valve, comprising a valve body (1), a first valve plate (2) and a first valve stem (3), wherein the valve body (1) is provided with a medium hole, the first valve stem (3) is rotatably disposed on the valve body (1) and extends into the medium hole, the first valve plate (2) is disposed in the medium hole and is fixedly connected to the first valve stem (3); characterized in that: It also comprises a second valve plate (4) and a second valve stem (5), wherein the second valve stem (5) is rotatably arranged on the first valve stem (3), a through hole (6) is arranged in the middle of the first valve plate (2), the second valve plate (4) is arranged in the through hole (6) and is fixedly connected to one end of the second valve stem (5), and the other end of the second valve stem (5) extends outside the first valve stem (3) and is connected to an actuator (7); The upper end of the second valve stem (5) is provided with an external spline (8), the upper end of the first valve stem (3) is provided with a countersunk hole (9), an internal spline is provided in the countersunk hole (9), a spline sleeve (10) is provided between the first valve stem (3) and the second valve stem (5), the spline sleeve (10) is slidably arranged on the second valve stem (5), the inner side of the spline sleeve (10) is spline-connected to the second valve stem (5), and the outer side of the spline sleeve (10) is provided with a spline shaft (11) that matches the countersunk hole (9).

2. A triple eccentric hard-sealed butterfly valve according to claim 1, characterized in that: The second valve stem (5) is provided with an upper plug hole (12) and a lower plug hole (13) along the length direction, and the spline sleeve (10) is provided with a pin shaft (14) slidably arranged in the radial direction, and the end of the pin shaft (14) close to the second valve stem (5) is inserted into the upper plug hole (12) or the lower plug hole (13).

3. A triple eccentric hard-sealed butterfly valve according to claim 1, characterized in that: A locking structure (18) is provided between the first valve stem (3) and the valve body (1).

4. A triple eccentric hard-sealed butterfly valve according to claim 1, characterized in that: A detachable valve seat (15) is provided in each of the medium hole and the through hole (6), and a valve plate sealing ring (16) matching the corresponding valve seat (15) is provided on the outer edges of the first valve plate (2) and the second valve plate (4).

5. A triple eccentric hard-sealed butterfly valve according to claim 4, characterized in that: The valve plate sealing ring (16) is arranged on the first valve plate (2) or the second valve plate (4) via a valve plate pressing ring (17).

6. A triple eccentric hard-sealed butterfly valve according to claim 1, characterized in that: A sealing structure is provided between the first valve stem (3) and the valve body (1), and between the second valve stem (5) and the first valve stem (3).

7. A triple eccentric hard-sealed butterfly valve according to claim 1, characterized in that: The actuator (7) is a hand wheel.

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