Butterfly valve with anti-blocking, dustproof and high-temperature-resistant external positioning and guiding structure

Abstract

The invention provides a butterfly valve with an anti-blocking, dustproof and high-temperature-resistant external positioning and guiding structure, which comprises a valve body, the valve body is internally provided with a circulation cavity, and the side wall of the circulation cavity is provided with a first through hole and a second through hole which are opposite to each other; the valve seat is arranged on the inner wall of the circulation cavity; the valve plate is arranged in the circulation cavity; the first transmission shaft penetrates through the first through hole, and one end of the first transmission shaft is connected with the valve plate; the second rotating shaft penetrates through the second through hole, and one end of the second rotating shaft is connected with the valve plate; the first mounted bearing is arranged on the outer side of the valve body, and the other end of the first transmission shaft is matched with the first mounted bearing; and the second mounted bearing is arranged on the outer side of the valve body, and the other end of the second transmission shaft is matched with the second mounted bearing. The problem of jamming under the working conditions of high temperature and dust particles is solved, and the operation stability is improved.

Description

Technical Field

[0001] The present invention relates to the field of valve technology, and in particular to a butterfly valve with an anti-sticking, dust-proof and high-temperature resistant external positioning guide structure. Background Art

[0002] With the continuous improvement of the level of industrial automation control, the requirements for the reliability and economy of the cut-off valve in the control process are also constantly increasing, especially under harsh working conditions, higher requirements are put forward for the stability of the product. In the metallurgical, chemical, power generation and other industries, especially in the carbon black oil system of the coal power industry, the medium has high temperature, large pressure difference, high hardness and strong scouring properties of fine particles, and the temperature can even reach 600°C. The existing technology of butterfly valve transmission shaft guidance and positioning all adopts built-in structure. In some cases where high temperature is accompanied by hard particle dust in the medium, although some valves adopt graphite packing to prevent dust in the guide sleeve, the use effect under actual working conditions is not ideal. On the one hand, the transmission shaft and guide sleeve will expand unevenly, and the guide sleeve is easy to bite the transmission shaft, which increases the friction with the transmission shaft. In this process, the transmission shaft is easy to break or deform. On the other hand, after the guide sleeve and the transmission shaft are deformed, the graphite packing in the guide sleeve is misaligned and cannot fit evenly on the transmission shaft to prevent dust. The particles in the medium can easily enter the fitting surface of the transmission shaft and the guide sleeve, and the jamming phenomenon is further aggravated, resulting in the valve not being able to work properly and the device being shut down, causing economic losses. Commonly used high-temperature butterfly valves are mostly extended upper covers with heat sink structures, which are bulky and expensive, and have unstable performance.

[0003] To this end, the present invention provides a butterfly valve with an anti-sticking, dust-proof and high-temperature resistant external positioning guide structure to prevent the butterfly valve from getting stuck or even not rotating under high temperature and dust particle conditions, thereby improving operating stability. Summary of the invention

[0004] In view of the defects in the prior art, an object of the present invention is to provide a butterfly valve that can avoid jamming under high temperature and dust particle conditions.

[0005] The butterfly valve with an anti-sticking, dust-proof and high-temperature resistant external positioning guide structure provided by the present invention comprises:

[0006] A valve body, wherein the valve body has a flow cavity therein, and a first through hole and a second through hole opposite to each other are formed on a side wall of the flow cavity, wherein the first through hole and the second through hole are perpendicular to a flow direction of the flow cavity;

[0007] A valve seat, the valve seat being arranged on the inner wall of the flow chamber;

[0008] a valve plate, the valve plate being arranged in the flow chamber and being rotatable; when the valve plate is rotated to be perpendicular to the flow direction, the valve plate cooperates with the valve seat and the flow chamber is blocked;

[0009] a first transmission shaft, the first transmission shaft passes through the first through hole, and one end of the first transmission shaft is connected to the valve plate;

[0010] a second rotating shaft, the second rotating shaft passes through the second through hole, and one end of the second rotating shaft is connected to the valve plate;

[0011] a first seat bearing, wherein the first seat bearing is arranged on the outer side of the valve body, the other end of the first transmission shaft cooperates with the first seat bearing, and the first transmission shaft passes through the first seat bearing;

[0012] A second seat bearing is provided on the outer side of the valve body, the other end of the second transmission shaft cooperates with the second seat bearing, and the second seat bearing also axially supports the second transmission shaft.

[0013] Furthermore, the first transmission shaft, the second transmission shaft and the valve plate, the first transmission shaft, the second transmission shaft plate and the sealing surface of the valve seat, and the sealing surface of the valve plate and the flow chamber form a three-eccentric structure.

[0014] Preferably, the first transmission shaft, the second transmission shaft and the valve plate are connected by pins.

[0015] Furthermore, high-temperature packing and spacers are respectively provided between the first transmission shaft, the second transmission shaft and the valve body, graphite packing is installed in the groove of the spacer, and a packing pressure plate is provided at the end of the high-temperature seasoning.

[0016] Preferably, the first transmission shaft, the second transmission shaft and the spacer are clearance fits, and the first transmission shaft, the second transmission shaft and the graphite packing are interference fits.

[0017] Preferably, the first seat bearing and the second seat bearing are respectively connected to two brackets, and the two brackets are respectively connected to the valve body.

[0018] Furthermore, the bracket is connected to the valve body via a stud and a nut, a butterfly spring is provided on the stud, and the butterfly spring is compressed by the nut.

[0019] Preferably, the valve seat is connected to the valve body via a valve seat pressure ring, a valve seat pressure ring and screws, and a graphite gasket is provided between the valve seat and the valve body.

[0020] Furthermore, the inner wall of the second seat bearing is provided with a step, an adjustment pad is provided on the step, and the end of the second transmission shaft is pressed on the adjustment pad.

[0021] Preferably, the first transmission shaft and the second transmission shaft are connected as one body.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The butterfly valve with an anti-stuck, dust-proof and high-temperature resistant external positioning guide structure provided by the present invention adopts an external seat bearing form, so that the heat transferred to the seat bearing is limited, and the expansion deformation of the matching part of the seat bearing and the transmission shaft is avoided, thereby avoiding the jamming of the transmission shaft, having the characteristics of dustproof and high temperature resistance, and reducing the manufacturing cost of the butterfly valve. The butterfly valve of the present invention is used in a medium containing fine particles, and can achieve stable operation and smooth switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0025] Figure 1 A front view of a butterfly valve with an anti-sticking, dust-proof and high-temperature-resistant external positioning guide structure according to an embodiment of the present invention;

[0026] Figure 2 It is a schematic diagram of the triple eccentric principle of a butterfly valve according to an embodiment of the present invention;

[0027] Figure 3 for Figure 1 The enlarged schematic diagram of point Ⅰ in the middle;

[0028] Figure 4 for Figure 1 The enlarged schematic diagram of the middle II;

[0029] Figure 5 for Figure 1 Enlarged schematic diagram of point III in the middle.

[0030] Among them, 1-first bearing with seat, 2-bolt, 3-first nut, 4-bracket, 5-fastener, 6-high temperature packing, 7-spacer, 8-graphite packing, 9-first transmission shaft, 10-valve plate, 11-pin, 12-second transmission shaft, 13-second nut, 14-stud, 15-butterfly spring, 16-packing pressure plate, 17-graphite gasket, 18-valve seat, 19-valve seat pressure ring, 20-valve seat pressure ring, 21-screw, 22-adjusting pad, 23-valve body, 24-second bearing with seat, 25-circulation chamber. DETAILED DESCRIPTION

[0031] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0032] The present invention provides a butterfly valve with an anti-sticking, dust-proof and high-temperature resistant external positioning guide structure, which adopts an external seated bearing method to avoid the sticking problem of the butterfly valve under high temperature and dust particle conditions, improve the operating stability of the valve, and reduce costs.

[0033] like Figure 1 As shown, the butterfly valve of the present invention has a valve body 23, the interior of the valve body 23 is a flow chamber 25, and the fluid flows in the flow chamber 25. The side wall of the valve body 23 is provided with a first through hole and a second through hole opposite to each other, the first through hole and the second through hole are collinear, and the first through hole and the second through hole are perpendicular to the flow direction in the flow chamber 25. A valve seat 18 is provided on the side wall of the flow chamber 25 at one end of the valve body 23.

[0034] A valve plate 10 is provided in the flow chamber 25 of the valve body 23. The valve plate 10 can rotate to change the flow area of ​​the flow chamber 25 and adjust the flow of the butterfly valve. When the valve plate 10 rotates to be perpendicular to the flow direction of the flow chamber 25, the valve plate 10 cooperates with the valve seat 18 to form a sealed connection, completely isolating the flow in the flow chamber 25.

[0035] The two through holes of the valve body 23 are respectively provided with a first transmission shaft 9 and a second transmission shaft 12, one end of the first transmission shaft 9 is connected to the valve plate 10, and the other end extends to the outside of the valve body 23; one end of the second transmission shaft 12 is connected to the valve plate 10, and the other end extends to the outside of the valve body 23. In this way, the valve plate 10 can rotate with the first transmission shaft 9 and the second transmission shaft 12 as the rotation axis.

[0036] Specifically, the first transmission shaft 9 and the second transmission shaft 12 are respectively connected to the side of the valve plate 10, and the first transmission shaft 9 and the second transmission shaft 12 are respectively connected to the valve plate 10 through the pin 11. When the butterfly valve is closed, the valve plate 10 is located between the first transmission shaft 9 and the valve seat 18.

[0037] In other embodiments, the first transmission shaft 9 and the second transmission shaft 12 may be replaced by one transmission shaft, or the first transmission shaft 9 and the second transmission shaft 12 may be connected as one.

[0038] At the first through hole and the second through hole of the valve body 23, a high-temperature filler 6 and a spacer 7 are respectively arranged between the first transmission shaft 9, the second transmission shaft 12 and the valve body 23, and a graphite packing 8 is installed in the groove of the spacer 7. The first transmission shaft 9, the second transmission shaft 12 and the high-temperature filler 6 adopt a clearance fit, and the clearance can offset the shape deformation caused by the expansion of the two materials at high temperature. The first transmission shaft 9, the second transmission shaft 12 and the graphite packing 8 adopt an interference fit to prevent dust and fine particles from entering the gap between the spacer 7 and the first transmission shaft 9, the second transmission shaft 12 during the operation of the product, causing jamming during the transmission process.

[0039] The outer side of the valve body 23 is provided with a first seat bearing 1 and a second seat bearing 24, respectively, and the first seat bearing 1 and the second seat bearing 24 are respectively fixed on the valve body 23. The first transmission shaft 9 passes through the first seat bearing 1, so that the first transmission shaft 9 is supported by the first seat bearing 1 and can rotate. The second transmission shaft 12 cooperates with the second seat bearing 24, so that the second transmission shaft 12 is supported by the second seat bearing 24 and can rotate.

[0040] The first seat bearing 1 guides the first transmission shaft 9, and the second seat bearing 24 guides the second transmission shaft 12. Since the first seat bearing 1 and the second seat bearing 24 are installed outside the valve body 23, the amount of high temperature heat in the valve body 23 transferred to the first seat bearing 1 and the second seat bearing 24 is very limited, and the heat is not enough to cause the first seat bearing 1 and the first transmission shaft 9, and the second seat bearing 24 and the second transmission shaft 12 to expand and deform. At the same time, the rolling bearings in the first seat bearing 1 and the second seat bearing 24 have axial and radial clearances, which can automatically adjust the concentricity of the matching parts to a certain extent under the change of temperature difference, without affecting the guidance of the product. This structure can avoid the transmission shaft and the guide sleeve from being matched in the valve body, so that the two materials will not expand evenly at high temperatures and cause biting. This structure can also save the heavy and costly extended upper cover with heat sinks, reducing costs.

[0041] Specifically, the first seat bearing 1 and the second seat bearing 24 are fixed to the bracket 4 by bolts 2 and first nuts 3 respectively, and the bracket 4 is fixed to the valve body 23 by fasteners 5, thereby realizing the connection between the first seat bearing 1, the second seat bearing 24 and the valve body 23.

[0042] like Figure 2 As shown, the first transmission shaft 9, the second transmission shaft 12 and the valve plate 10, the first transmission shaft 9, the second transmission shaft 12 and the sealing surface of the valve cover 18, and the sealing surface of the valve cover 18 and the flow chamber 25 of the present invention meet the three-eccentric structural characteristics.

[0043] like Figure 3 As shown, the fastener 5 includes a second nut 13, a stud 14 and a butterfly spring 15. A packing pressure plate 16 is provided at the end of the high-temperature packing 6. The packing pressure plate 16 is fixed to the valve body 23 through the second nut 13 and the stud 14, and the high-temperature packing 6 is pressed. In order to prevent the high-temperature packing 6 from expanding and contracting under high temperature, so that a gap between the packing pressure plate 16 and the valve body 23 is formed and the seal cannot be sealed, resulting in leakage, a butterfly spring 15 is provided on the inner side of the second nut 13. The butterfly spring 15 can provide a pre-tightening force when the high-temperature packing 6 expands and contracts to produce a gap, thereby ensuring sealing.

[0044] like Figure 4As shown, the valve seat 18 is fixed by a valve seat pressing ring 19, a valve seat pressing ring 20, and a screw 21. The valve seat pressing ring 20 is fixed to the valve body 23 by the screw 21. The valve seat pressing ring 20 presses the valve seat pressing ring 19, and the valve seat pressing ring 19 presses the valve seat 18 to fix the valve seat 18 to the valve body 23. In order to prevent leakage, a graphite gasket 17 is provided between the valve seat 18 and the valve body 23, so that the valve seat 18, the valve seat pressing ring 19, and the valve seat pressing ring 20 form a closed circuit after cooperation, so as to prevent the medium in the cavity from leaking out through the valve seat 18. When this sealing structure is in operation, the flow resistance is small and the flow rate is large after the valve plate 10 is fully opened.

[0045] In a specific embodiment, the valve seat 18 is a metal valve seat, so as to prevent the valve seat 18 from failing under high temperature and hard particle conditions and causing leakage.

[0046] like Figure 5 As shown, a step is provided on the inner wall of the second seat bearing 24, and an adjustment pad 22 is provided on the step, and the end of the second transmission shaft 12 is supported on the adjustment pad 22. The adjustment pad 22 realizes the fine adjustment of the upper and lower positions of the second transmission shaft 12 during the assembly process, and the weight of the valve trim is borne on the adjustment pad 22 instead of directly on the second seat bearing 24, so as to avoid the second transmission shaft 12 exceeding the axial clearance of the second seat bearing 24 and causing guide compensation. In this embodiment, the adjustment pad 22 can be made of 718 nickel alloy.

[0047] The butterfly valve with an anti-sticking, dust-proof and high-temperature resistant external positioning structure of the present invention complies with the principle of a three-eccentric cam, so that the valve plate 10 and the valve seat 18 can be quickly disengaged and closed when opening and closing, without any sticking and running smoothly throughout the process.

[0048] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A butterfly valve with an anti-sticking, dust-proof and high-temperature resistant external positioning guide structure, characterized in that: include: A valve body, wherein the valve body has a flow cavity therein, and a first through hole and a second through hole opposite to each other are formed on a side wall of the flow cavity, wherein the first through hole and the second through hole are perpendicular to a flow direction of the flow cavity; A valve seat, the valve seat being arranged on the inner wall of the flow chamber; a valve plate, the valve plate being arranged in the flow chamber and being rotatable; when the valve plate is rotated to be perpendicular to the flow direction, the valve plate cooperates with the valve seat and the flow chamber is blocked; a first transmission shaft, the first transmission shaft passes through the first through hole, and one end of the first transmission shaft is connected to the valve plate; a second rotating shaft, the second rotating shaft passes through the second through hole, and one end of the second rotating shaft is connected to the valve plate; a first seat bearing, wherein the first seat bearing is arranged on the outer side of the valve body, the other end of the first transmission shaft cooperates with the first seat bearing, and the first transmission shaft passes through the first seat bearing; A second seat bearing is provided on the outer side of the valve body, the other end of the second transmission shaft cooperates with the second seat bearing, and the second seat bearing also axially supports the second transmission shaft.

2. The butterfly valve with an anti-sticking, dust-proof and high-temperature resistant external positioning guide structure according to claim 1 is characterized in that: The first transmission shaft, the second transmission shaft and the valve plate, the first transmission shaft, the second transmission shaft plate and the sealing surface of the valve seat, and the sealing surface of the valve plate and the flow chamber form a three-eccentric structure.

3. The butterfly valve with an anti-sticking, dust-proof and high-temperature resistant external positioning guide structure according to claim 1, characterized in that: The first transmission shaft, the second transmission shaft and the valve plate are connected via pins.

4. The butterfly valve with an anti-sticking, dust-proof and high-temperature resistant external positioning guide structure according to claim 1, characterized in that: A high-temperature packing and a spacer are respectively arranged between the first transmission shaft, the second transmission shaft and the valve body. A graphite packing is installed in the groove of the spacer. A packing pressure plate is arranged at the end of the high-temperature seasoning.

5. The butterfly valve with an anti-sticking, dust-proof and high-temperature resistant external positioning guide structure according to claim 4 is characterized in that: The first transmission shaft, the second transmission shaft and the spacer are clearance fit, and the first transmission shaft, the second transmission shaft and the graphite packing are interference fit.

6. The butterfly valve with an anti-sticking, dust-proof and high-temperature resistant external positioning guide structure according to claim 1, characterized in that: The first seat bearing and the second seat bearing are respectively connected to two brackets, and the two brackets are respectively connected to the valve body.

7. The butterfly valve with an anti-sticking, dust-proof and high-temperature resistant external positioning guide structure according to claim 6, characterized in that: The bracket is connected to the valve body through a stud and a nut. A butterfly spring is arranged on the stud, and the butterfly spring is compressed by the nut.

8. The butterfly valve with an anti-sticking, dust-proof and high-temperature resistant external positioning guide structure according to claim 1, characterized in that: The valve seat is connected to the valve body through a valve seat pressure ring, a valve seat pressure ring and screws, and a graphite gasket is arranged between the valve seat and the valve body.

9. The butterfly valve with an anti-sticking, dust-proof and high-temperature resistant external positioning guide structure according to claim 1, characterized in that: The inner wall of the second seat bearing is provided with a step, an adjustment pad is provided on the step, and the end of the second transmission shaft is pressed on the adjustment pad.

10. The butterfly valve with an anti-sticking, dust-proof and high-temperature resistant external positioning guide structure according to claim 1, characterized in that: The first transmission shaft and the second transmission shaft are connected as one body.

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