A double eccentric butterfly valve

Abstract

The present application provides a double eccentric butterfly valve including a valve body, a cavity, a valve stem, a valve plate and a fireproof expansion piece. The cavity is opened in the valve body and passes through the valve body. The valve stem is rotatably arranged in the valve body. The valve plate is mounted on the valve stem and rotates driven by the valve stem. The fireproof expansion piece is detachably mounted in the valve plate and is configured to expand between the inner peripheral side of the valve body and the outer peripheral side of the valve plate to block the cavity. A main sealing ring is clamped on the inner peripheral side of the valve body. The double eccentric butterfly valve provided in the present application adopts a fireproof expansion piece. Compared with the fireproof sealing ring in the related art, in the event of a fire, the fireproof sealing ring is prevented from causing a gap between the valve body and the valve plate due to wear, looseness, etc., thereby preventing leakage of the medium, having a good sealing effect, and being able to prevent safety accidents as much as possible.

Description

Technical Field

[0001] The present application relates to the field of fireproof valves, and in particular to a double eccentric butterfly valve. Background Art

[0002] A butterfly valve is a valve that uses a disc-type opening and closing member to reciprocate about 90° to open, close or adjust the flow of the medium. The butterfly valve has a simple structure, small size, light weight, low material consumption, small installation size, small driving torque, easy and quick operation, and also has good flow regulation function and closing sealing characteristics. It is one of the fastest-growing valve varieties in the past decade and is widely used in industries such as petroleum, chemical, shipbuilding and electricity. When using a butterfly valve to transport flammable and explosive media, in the event of a fire, the sealing ring in the butterfly valve is prone to failure, resulting in medium leakage, which poses a great safety hazard. In related technologies, the sealing ring is usually directly replaced with a fireproof sealing ring to prevent medium leakage in the event of a fire. However, in actual application, as the number of times the valve is adjusted increases, the fireproof sealing ring is prone to wear and loosening, which also poses a great safety hazard. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a double eccentric butterfly valve to solve the technical problem in the prior art that the sealing ring is prone to failure under high temperature conditions or in the event of a fire.

[0004] To achieve the above purpose, the technical solution adopted in this application is: to provide a double eccentric butterfly valve, including:

[0005] Valve body;

[0006] A cavity, the cavity is opened in the valve body and penetrates the valve body;

[0007] A valve stem, the valve stem being rotatably disposed in the valve body;

[0008] A valve plate, which is mounted on the valve stem and rotates under the drive of the valve stem;

[0009] A fireproof expansion member is detachably mounted in the valve plate and is configured to expand between an inner peripheral side of the valve body and an outer peripheral side of the valve plate to block the cavity.

[0010] Optionally, the fireproof expansion member includes a first expansion ring piece and a second expansion ring piece, and the first expansion ring piece and the second expansion ring piece can be detachably mounted on the valve plate, and are arranged at intervals along the axial direction of the valve plate, and are at least partially exposed to the outer peripheral side of the valve plate.

[0011] Optionally, the first expandable ring piece includes a first inner expandable ring piece and a first outer expandable ring piece, the first inner expandable ring piece is detachably mounted in the valve plate, the first outer expandable ring piece is connected to the outer peripheral side of the first inner expandable ring piece, and the axial size of the first outer expandable ring piece is larger than the axial size of the first inner expandable ring piece;

[0012] And / or, the second expandable ring segment includes a second internal expandable ring segment and a second external expandable ring segment, the second internal expandable ring segment is detachably installed in the valve plate, the second external expandable ring segment is connected to the outer peripheral side of the second internal expandable ring segment, and the axial size of the second external expandable ring segment is larger than the axial size of the second internal expandable ring segment.

[0013] Optionally, the double eccentric butterfly valve further comprises a fireproof heat-conducting component, which is detachably mounted on the valve plate, contacts the fireproof expansion component, and is at least partially exposed outside the valve plate.

[0014] Optionally, the fireproof heat-conducting component includes a first heat-conducting ring sheet, a second heat-conducting ring sheet and a third heat-conducting ring sheet, the first heat-conducting ring sheet is connected to the third heat-conducting ring sheet and contacts the first expansion ring sheet, the second heat-conducting ring sheet is linked to the third heat-conducting ring sheet and contacts the second expansion ring sheet, and at least part of the third heat-conducting ring sheet is exposed outside the valve plate.

[0015] Optionally, the valve plate includes a plate body, a first ring block and a second ring block, the plate body is mounted on the valve stem and rotates under the drive of the valve stem, the first ring block is detachably mounted on the plate body, the second expansion ring piece is clamped between the plate body and the first ring block, the second ring block is detachably mounted on the first ring block, and the first expansion ring piece is clamped between the first ring block and the second ring block.

[0016] Optionally, a first inclined surface is provided on a side of the first ring block facing the first expandable ring piece; the first expandable ring piece further comprises a first bent expandable ring piece, the first bent expandable ring piece is connected between the first inner expandable ring piece and the first outer expandable ring piece, and forms a limit with the first inclined surface in the radial direction of the plate body;

[0017] And / or, a second inclined surface is provided on one side of the second ring block toward the second expandable ring piece; the second expandable ring piece also includes a second bent expandable ring piece, which is connected between the second inner expandable ring piece and the second outer expandable ring piece, and forms a limit with the second inclined surface in the radial direction of the plate body.

[0018] Optionally, the valve plate further includes a first sealing ring and a second sealing ring, wherein the first sealing ring is abutted between the first ring block and the second ring block, and the second sealing ring is abutted between the plate body and the first ring block.

[0019] Optionally, the outer peripheral side of the valve body has a first valve seat and a second valve seat, and the first valve seat and the second valve seat are symmetrically arranged; the valve stem includes a first rod body and a second rod body, the first rod body can be rotatably inserted into the first valve seat and has at least one first rod clamping groove, the second rod body can be rotatably inserted into the second valve seat and has at least one second rod clamping groove; the valve plate also includes a first connecting block and a second connecting block, the first connecting block is connected to the plate body and has at least one first clamping groove, at least one first clamping groove and at least one first rod clamping groove are arranged in a one-to-one correspondence, the second connecting block is connected to the plate body and has at least one second clamping groove, at least one second clamping groove and at least one second rod clamping groove are arranged in a one-to-one correspondence.

[0020] Optionally, a main sealing ring is clamped on the inner circumference of the valve body.

[0021] The double eccentric butterfly valve provided by the present application has the following beneficial effects:

[0022] The double eccentric butterfly valve provided in the present application adopts a fireproof expansion piece. Compared with the fireproof sealing ring in the related technology, in the event of a fire, it can prevent the fireproof sealing ring from wearing, loosening, etc., which may cause a gap between the valve body and the valve plate, thereby avoiding medium leakage, having a good sealing effect, and preventing safety accidents as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 A first perspective stereoscopic image of a double eccentric butterfly valve provided in an embodiment of the present application;

[0025] Figure 2 A second perspective stereoscopic image of a double eccentric butterfly valve provided in an embodiment of the present application;

[0026] Figure 3 A cross-sectional view of a valve plate of a double eccentric butterfly valve provided in an embodiment of the present application;

[0027] Figure 4 for Figure 3A partial enlarged view of the middle A;

[0028] Figure 5 This is a stereoscopic view of the double eccentric butterfly valve provided in an embodiment of the present application without including a valve plate.

[0029] Among them, the reference numerals in the figure are:

[0030] 100, valve body; 110, first valve seat; 120, second valve seat;

[0031] 200, cavity;

[0032] 300, valve stem; 310, first rod body; 320, second rod body; 330, first rod clamping groove; 340, second rod clamping groove;

[0033] 400, valve plate; 410, plate body; 420, first ring block; 421, first inclined surface; 422, second inclined surface; 430, second ring block; 440, first sealing ring; 450, second sealing ring; 460, first connecting block; 470, second connecting block; 480, first clamping groove; 490, second clamping groove;

[0034] 500, fireproof expansion piece; 510, first expansion ring piece; 511, first internal expansion ring piece; 512, first external expansion ring piece; 513, first bending expansion ring piece; 520, second expansion ring piece; 521, second internal expansion ring piece; 522, second external expansion ring piece; 523, second bending expansion ring piece;

[0035] 600, fireproof heat-conducting member; 610, first heat-conducting ring piece; 620, second heat-conducting ring piece; 630, third heat-conducting ring piece;

[0036] 700. Main sealing ring. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] like Figures 1 to 5 As shown, the embodiment of the present application provides a double eccentric butterfly valve including a valve body 100, a cavity 200, a valve stem 300, a valve plate 400 and a fireproof expansion member 500. The cavity 200 is opened in the valve body 100 and passes through the valve body 100. The valve stem 300 is rotatably arranged in the valve body 100. The valve plate 400 is mounted on the valve stem 300 and rotates under the drive of the valve stem 300. The fireproof expansion member 500 is detachably mounted in the valve plate 400 and is configured to be able to expand between the inner circumference of the valve body 100 and the outer circumference of the valve plate 400 to block the cavity 200. The main sealing ring 700 is clamped on the inner circumference of the valve body 100.

[0042] The working principle of this embodiment is as follows: during daily operation, the valve stem 300 rotates under the drive of an external driver. When the double eccentric butterfly valve needs to be closed, the valve stem 300 drives the valve plate 400 to rotate until the outer peripheral side of the valve plate 400 abuts against the main sealing ring 700. With the cooperation of the valve plate 400 and the main sealing ring 700, the cavity 200 can be blocked. When the double eccentric butterfly valve needs to be opened, the valve stem 300 drives the valve plate 400 to rotate so that the outer peripheral side of the valve plate 400 and the main sealing ring 700 are separated, and the cavity 200 can be connected. When the delivery flow of the double eccentric butterfly valve needs to be adjusted, the valve stem 300 drives the valve plate 400 to rotate, and by adjusting the rotation angle of the valve plate 400 to adjust the shielding area of ​​the valve plate 400 to the cavity 200, the purpose of adjusting the delivery flow of the double eccentric butterfly valve can be achieved. When a fire occurs, the staff quickly closes the double eccentric butterfly valve, the main seal ring 700 fails, and a gap appears between the inner peripheral side of the valve body 100 and the outer peripheral side of the valve body 100. At this time, the external ambient temperature gradually rises until the external ambient temperature reaches a certain threshold, and the fireproof expansion member 500 expands. After the fireproof expansion member 500 expands, it fills the gap between the valve body 100 and the valve plate 400, so that the cavity 200 is blocked again. After the fire is extinguished, the staff disassembles the double eccentric butterfly valve and replaces the failed main seal ring 700 and the expanded fireproof expansion member 500.

[0043] The double eccentric butterfly valve provided in the present application adopts a fireproof expansion piece 500. Compared with the fireproof sealing ring in the related art, in the event of a fire, it can prevent the fireproof sealing ring from being worn, loosened, etc., resulting in a gap between the valve body 100 and the valve plate 400, thereby avoiding medium leakage, having a good sealing effect, and being able to prevent safety accidents as much as possible.

[0044] Optionally, the main sealing ring 700 is configured as a fireproof sealing ring.

[0045] In this way, the main sealing ring 700 is configured as a fireproof sealing ring, which, in cooperation with the fireproof expansion member 500, helps to further improve the sealing effect of the double eccentric butterfly valve in the event of a fire.

[0046] In one embodiment of the present application, see Figures 1 to 5 The fireproof expansion member 500 includes a first expansion ring piece 510 and a second expansion ring piece 520. The first expansion ring piece 510 and the second expansion ring piece 520 can be detachably mounted on the valve plate 400, and are arranged at intervals along the axial direction of the valve plate 400, and are at least partially exposed to the outer peripheral side of the valve plate 400.

[0047] It should be noted that the axial direction above and below refers to the bidirectional direction of the central axis defined by the structure (disc) of the valve plate 400 itself. Figure 3 The X-axis shown in .

[0048] In this way, the fireproof expansion member 500 can expand from two different positions on the outer peripheral side of the valve plate 400 by using the first expansion ring piece 510 and the second expansion ring piece 520. Compared with using only one expansion ring piece, it helps to further improve the sealing effect. In addition, since at least part of the first expansion ring piece 510 and the second expansion ring piece 520 are exposed to the outer peripheral side of the valve plate 400, in the event of a fire, the first expansion ring piece 510 and the second expansion ring piece 520 can quickly fill the gap between the valve body 100 and the valve plate 400, thereby preventing the leakage of the medium as soon as possible.

[0049] In one embodiment of the present application, please refer to Figures 1 to 5 The first expandable ring piece 510 includes a first internal expandable ring piece 511 and a first external expandable ring piece 512. The first internal expandable ring piece 511 is detachably mounted in the valve plate 400. The first external expandable ring piece 512 is connected to the outer peripheral side of the first internal expandable ring piece 511. The axial size of the first external expandable ring piece 512 is larger than the axial size of the first internal expandable ring piece 511. The second expandable ring piece 520 includes a second internal expandable ring piece 521 and a second external expandable ring piece 522. The second internal expandable ring piece 521 is detachably mounted in the valve plate 400. The second external expandable ring piece 522 is connected to the outer peripheral side of the second internal expandable ring piece 521. The axial size of the second external expandable ring piece 522 is larger than the axial size of the second internal expandable ring piece 521.

[0050] It should be noted that in this embodiment, the example is taken that the axial size of the first external expansion ring piece 512 is larger than the axial size of the first internal expansion ring piece 511, and the axial size of the second external expansion ring piece 522 is larger than the axial size of the second internal expansion ring piece 521. Of course, in other embodiments, according to actual application requirements, the axial size of the first external expansion ring piece 512 is equal to the axial size of the first internal expansion ring piece 511, and the axial size of the second external expansion ring piece 522 is larger than the axial size of the second internal expansion ring piece 521; or, the axial size of the first external expansion ring piece 512 is larger than the axial size of the first internal expansion ring piece 511, and the axial size of the second external expansion ring piece 522 is equal to the axial size of the second internal expansion ring piece 521, and no unique limitation is made here.

[0051] In this configuration, the axial size of the first external expansion ring piece 512 is larger than the axial size of the first internal expansion ring piece 511, and is equal to or smaller than the axial size of the first internal expansion ring piece 511 compared to the axial size of the first external expansion ring piece 512, which helps to increase the contact area between the first expansion ring piece 510 and the inner circumference of the valve body 100, thereby helping to improve the sealing effect of the first expansion ring piece 510 in the event of a fire. The axial size of the second external expansion ring piece 522 is larger than the axial size of the second internal expansion ring piece 521, and is equal to or smaller than the axial size of the second internal expansion ring piece 521 compared to the axial size of the second external expansion ring piece 522, which helps to increase the contact area between the second expansion ring piece 520 and the inner circumference of the valve body 100, thereby helping to improve the sealing effect of the second expansion ring piece 520 in the event of a fire.

[0052] In one embodiment of the present application, see Figures 1 to 5 The double eccentric butterfly valve further includes a fireproof heat conductive member 600 , which is detachably mounted on the valve plate 400 , in contact with the fireproof expansion member 500 , and at least partially exposed outside the valve plate 400 .

[0053] With such a configuration, when a fire occurs, the fireproof heat conductive member 600 can quickly transfer the external environment temperature to the inside of the valve plate 400, so that the first expansion ring piece 510 and the second expansion ring piece 520 can expand as quickly as possible, thereby avoiding the first expansion ring piece 510 and the second expansion ring piece 520 from causing a safety accident due to a long expansion time, which helps to improve the safety performance of the double eccentric butterfly valve. In addition, the fireproof heat conductive member 600 is at least partially exposed to the outside of the valve plate 400, which facilitates the fireproof heat conductive member 600 to absorb heat from the external environment, thereby being able to quickly transfer the heat to the first expansion ring piece 510 and the second expansion ring piece 520, which also helps to improve the safety performance of the double eccentric butterfly valve.

[0054] In one embodiment of the present application, see Figures 1 to 5 The fireproof heat-conducting component 600 includes a first heat-conducting ring sheet 610, a second heat-conducting ring sheet 620 and a third heat-conducting ring sheet 630. The first heat-conducting ring sheet 610 is connected to the third heat-conducting ring sheet 630 and contacts the first expansion ring sheet 510. The second heat-conducting ring sheet 620 is linked to the third heat-conducting ring sheet 630 and contacts the second expansion ring sheet 520. At least part of the third heat-conducting ring sheet 630 is exposed outside the valve plate 400.

[0055] With such a configuration, when a fire occurs, the third heat-conducting ring piece 630 can quickly absorb the heat from the external environment and transfer the heat to the first heat-conducting ring piece 610 and the second heat-conducting ring piece 620. With the cooperation of the first heat-conducting ring piece 610, the second heat-conducting ring piece 620 and the third heat-conducting ring piece 630, the heat in the external environment can be quickly transferred to the first expansion ring piece 510 and the second expansion ring piece 520, so that the first expansion ring piece 510 and the second expansion ring piece 520 can be expanded quickly, which helps to improve the safety performance of the double eccentric butterfly valve.

[0056] In one embodiment of the present application, please refer to Figures 1 to 5 The valve plate 400 includes a plate body 410, a first ring block 420 and a second ring block 430. The plate body 410 is installed on the valve stem 300 and rotates driven by the valve stem 300. The first ring block 420 is detachably installed on the plate body 410. The second expansion ring piece 520 is clamped between the plate body 410 and the first ring block 420. The second ring block 430 is detachably installed on the first ring block 420. The first expansion ring piece 510 is clamped between the first ring block 420 and the second ring block 430.

[0057] The working principle of this embodiment is as follows: the first heat-conducting ring piece 610, the second heat-conducting ring piece 620 and the third heat-conducting ring piece 630 are pre-installed on the surface of the first ring block 420. When assembling the valve plate 400, first install the second expansion ring piece 520 on the surface of the plate body 410, then install the first ring block 420 together with the first heat-conducting ring piece 610, the second heat-conducting ring piece 620 and the third heat-conducting ring piece 630 on the side of the second expansion ring piece 520 facing away from the plate body 410, then install the first expansion ring piece 510 on the side of the first heat-conducting ring piece 610 facing away from the first ring block 420, and finally install the second ring block 430 on the side of the first expansion ring piece 510 facing away from the first heat-conducting ring piece 610. After the installation is completed, the staff uses external bolts to fix the first ring block 420, the second ring block 430, the first heat conductive ring piece 610, the second heat conductive ring piece 620, the third heat conductive ring piece 630, the first expansion ring piece 510 and the second expansion ring piece 520 to the plate body 410.

[0058] With such arrangement, the first expansion ring piece 510 and the second expansion ring piece 520 can realize a detachable connection design with the valve plate 400 through the plate body 410, the first ring block 420 and the second ring block 430, which is convenient for disassembly and replacement, and helps to improve the convenience of use. In addition, in the event of a fire, the gap between the first ring block 420 and the second ring block 430 can be sealed by the expansion of the first expansion ring piece 510, and the gap between the plate body 410 and the first ring block 420 can be sealed by the expansion of the second expansion ring piece 520. With the cooperation of the first expansion ring piece 510 and the second expansion ring piece 520, it is possible to prevent the medium from leaking from the inside of the valve plate 400, which helps to improve the sealing performance of the valve plate 400.

[0059] In one embodiment of the present application, see Figures 1 to 5 , a first inclined surface 421 is provided on the side of the first ring block 420 facing the first expansion ring piece 510. The first expansion ring piece 510 also includes a first bent expansion ring piece 513, which is connected between the first inner expansion ring piece 511 and the first outer expansion ring piece 512, and forms a limit with the first inclined surface 421 in the radial direction of the plate body 410. A second inclined surface 422 is provided on the side of the second ring block 430 facing the second expansion ring piece 520. The second expansion ring piece 520 also includes a second bent expansion ring piece 523, which is connected between the second inner expansion ring piece 521 and the second outer expansion ring piece 522, and forms a limit with the second inclined surface 422 in the radial direction of the plate body 410.

[0060] It should be noted that in this embodiment, the first ring block 420 is provided with the first inclined surface 421 and the second inclined surface 422, the first expansion ring piece 510 is provided with the first bent expansion ring piece 513, and the second expansion ring piece 520 is provided with the second bent expansion ring piece 523. Of course, in other embodiments, according to actual application requirements, the first ring block 420 may be provided with only the first inclined surface 421, the first expansion ring piece 510 is provided with the first bent expansion ring piece 513, and the second expansion ring piece 520 is not provided with the second bent expansion ring piece 523; or the first ring block 420 may be provided with only the second inclined surface 422, the first expansion ring piece 510 is not provided with the first bent expansion ring piece 513, and the second expansion ring piece 520 is provided with the second bent expansion ring piece 523, which is not limited here.

[0061] It should be noted that the radial directions above and below refer to the bidirectional directions perpendicular to the axis defined by the structure of the valve plate 400 itself. Figure 3 The Y-axis shown in .

[0062] With such arrangement, a limit can be formed in the radial direction through the first inclined surface 421 and the first bent expansion ring piece 513. During use, the first expansion ring piece 510 can be prevented from sliding in the radial direction, which helps to improve the structural stability between the first expansion ring piece 510 and the valve plate 400, and prevents the first expansion ring piece 510 from sliding, which causes the double eccentric butterfly valve to fail to seal in the event of a fire, thereby helping to ensure the sealing effect of the double eccentric butterfly valve in the event of a fire. Through the second inclined surface 422 and the second bent expansion ring piece 523, a limit can be formed in the radial direction. During use, the second expansion ring piece 520 can be prevented from sliding in the radial direction, which helps to improve the structural stability between the second expansion ring piece 520 and the valve plate 400, and prevents the first expansion ring piece from sliding, which causes the double eccentric butterfly valve to fail to seal in the event of a fire, thereby helping to ensure the sealing effect of the double eccentric butterfly valve in the event of a fire.

[0063] In one embodiment of the present application, please refer to Figures 1 to 5 The valve plate 400 further includes a first sealing ring 440 and a second sealing ring 450 . The first sealing ring 440 is abutted between the first ring block 420 and the second ring block 430 , and the second sealing ring 450 is abutted between the plate body 410 and the first ring block 420 .

[0064] In this configuration, the first sealing ring 440 can be used to seal the gap between the first heat-conducting ring piece 610 and the second block, preventing the medium from leaking from the gap between the first heat-conducting ring piece 610 and the second block during daily operation, which helps to improve the sealing effect of the valve plate 400 during daily operation. The second sealing ring 450 can be used to seal the gap between the second heat-conducting ring piece 620 and the plate body 410, preventing the medium from leaking from the gap between the second heat-conducting ring piece 620 and the plate body 410 during daily operation, which helps to improve the sealing effect of the valve plate 400 during daily operation.

[0065] In one embodiment of the present application, please refer to Figures 1 to 5The outer peripheral side of the valve body 100 has a first valve seat 110 and a second valve seat 120, and the first valve seat 110 and the second valve seat 120 are symmetrically arranged. The valve stem 300 includes a first rod body 310 and a second rod body 320, the first rod body 310 is rotatably inserted into the first valve seat 110, and is provided with at least one first rod clamping groove 330, and the second rod body 320 is rotatably inserted into the second valve seat 120, and is provided with at least one second rod clamping groove 340. The valve plate 400 also includes a first connecting block 460 and a second connecting block 470. The first connecting block 460 is connected to the plate body 410 and is provided with at least one first clamping groove 480. The at least one first clamping groove 480 and the at least one first rod clamping groove 330 are arranged in a one-to-one correspondence. The second connecting block 470 is connected to the plate body 410 and is provided with at least one second clamping groove 490. The at least one second clamping groove 490 and the at least one second rod clamping groove 340 are arranged in a one-to-one correspondence.

[0066] It should be noted that in this embodiment, the first rod clamping groove 330, the second rod clamping groove 340, the first block clamping groove 480, and the second block clamping groove 490 are all set to four. Of course, in other embodiments, according to actual applications, the first rod clamping groove 330, the second rod clamping groove 340, the first block clamping groove 480, and the second block clamping groove 490 can also be set to one, two, three, five, etc., and other numbers are not limited here.

[0067] The working principle of this embodiment is as follows: when assembling the double eccentric butterfly valve, four keys (not shown in the figure) are snapped into the four first snap-in grooves 480, and the other four keys are snapped into the four second snap-in grooves 490, and then the valve plate 400 together with the keys are placed in the cavity 200 of the valve body 100. The first rod 310 is passed through the first valve seat 110, and the four first rod snap-in grooves 330 are aligned with the four keys in the first connection block 460, the second rod 320 is passed through the second valve seat 120, and the four second rod snap-in grooves 340 are aligned with the four keys in the second connection block 470, and finally the end cover (not shown in the figure) is installed on the second valve seat 120.

[0068] In this way, the first rod body 310 can drive the plate body 410 to rotate through the first rod clamping groove 330 and the first block clamping groove 480 in cooperation with the key. The second rod clamping groove 340 and the second block clamping groove 490 can guide the rotation of the plate body 410 in cooperation with the key, which helps to improve the rotation stability of the plate body 410. When the first rod clamping groove 330 and the first block clamping groove 480 are provided in multiple numbers, compared with the case where the first rod clamping groove 330 and the first block clamping groove 480 are provided in only one number, the connection stability between the first rod body 310 and the first connecting block 460 is improved in cooperation with the key, thereby helping to improve the structural stability between the first rod body 310 and the first connecting block 460, so that the first rod body 310 can drive the plate body 410 to rotate. When the second rod clamping groove 340 and the second block clamping groove 490 are set to be multiple, compared with when the second rod clamping groove 340 and the second block clamping groove 490 are set to be only one, with the cooperation of the key, it helps to improve the connection stability between the second rod body 320 and the second connecting block 470, thereby helping to improve the structural stability between the second rod body 320 and the second connecting block 470, and facilitating the second rod body 320 to guide the plate body 410.

[0069] One or more embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A double eccentric butterfly valve, characterized in that: include: Valve body (100); a cavity (200), the cavity (200) being opened in the valve body (100) and penetrating the valve body (100); a valve stem (300), the valve stem (300) being rotatably disposed through the valve body (100); a valve plate (400), the valve plate (400) being mounted on the valve stem (300) and being driven by the valve stem (300) to rotate; a fireproof expansion member (500), the fireproof expansion member (500) being detachably mounted in the valve plate (400) and being configured to expand between the inner peripheral side of the valve body (100) and the outer peripheral side of the valve plate (400) so as to block the cavity (200); the fireproof expansion member (500) comprising a first expansion ring sheet (510) and a second expansion ring sheet (520), the first expansion ring sheet (510) and the second expansion ring sheet (520) being detachably mounted on the valve plate (400), and being spaced apart along the axial direction of the valve plate (400), and at least partially exposed to the outer peripheral side of the valve plate (400); The double eccentric butterfly valve further comprises a fireproof heat-conducting component (600), wherein the fireproof heat-conducting component (600) is detachably mounted on the valve plate (400), contacts the fireproof expansion component (500), and is at least partially exposed outside the valve plate (400); The fireproof heat-conducting component (600) comprises a first heat-conducting ring sheet (610), a second heat-conducting ring sheet (620) and a third heat-conducting ring sheet (630), wherein the first heat-conducting ring sheet (610) is connected to the third heat-conducting ring sheet (630) and contacts the first expansion ring sheet (510), the second heat-conducting ring sheet (620) is connected to the third heat-conducting ring sheet (630) and contacts the second expansion ring sheet (520), and at least a portion of the third heat-conducting ring sheet (630) is exposed outside the valve plate (400).

2. The double eccentric butterfly valve according to claim 1, characterized in that: The first expandable ring piece (510) comprises a first internal expandable ring piece (511) and a first external expandable ring piece (512); the first internal expandable ring piece (511) is detachably mounted in the valve plate (400); the first external expandable ring piece (512) is connected to the outer peripheral side of the first internal expandable ring piece (511); and the axial size of the first external expandable ring piece (512) is greater than the axial size of the first internal expandable ring piece (511); And / or, the second expandable ring piece (520) includes a second internal expandable ring piece (521) and a second external expandable ring piece (522), the second internal expandable ring piece (521) is detachably mounted in the valve plate (400), the second external expandable ring piece (522) is connected to the outer peripheral side of the second internal expandable ring piece (521), and the axial size of the second external expandable ring piece (522) is greater than the axial size of the second internal expandable ring piece (521).

3. The double eccentric butterfly valve according to claim 2, characterized in that: The valve plate (400) comprises a plate body (410), a first ring block (420) and a second ring block (430); the plate body (410) is mounted on the valve stem (300) and rotates driven by the valve stem (300); the first ring block (420) is detachably mounted on the plate body (410); the second expansion ring piece (520) is clamped between the plate body (410) and the first ring block (420); the second ring block (430) is detachably mounted on the first ring block (420); and the first expansion ring piece (510) is clamped between the first ring block (420) and the second ring block (430).

4. The double eccentric butterfly valve according to claim 3, characterized in that: A first inclined surface (421) is provided on a side of the first ring block (420) facing the first expansion ring piece (510); the first expansion ring piece (510) further comprises a first bent expansion ring piece (513), the first bent expansion ring piece (513) being connected between the first inner expansion ring piece (511) and the first outer expansion ring piece (512), and forming a limit position with the first inclined surface (421) in the radial direction of the plate body (410); And / or, a second inclined surface (422) is provided on a side of the second ring block (430) facing the second expandable ring piece (520); the second expandable ring piece (520) further comprises a second bent expandable ring piece (523), the second bent expandable ring piece (523) is connected between the second inner expandable ring piece (521) and the second outer expandable ring piece (522), and forms a limit with the second inclined surface (422) in the radial direction of the plate body (410).

5. The double eccentric butterfly valve according to claim 3, characterized in that: The valve plate (400) further comprises a first sealing ring (440) and a second sealing ring (450), wherein the first sealing ring (440) is abutted between the first ring block (420) and the second ring block (430), and the second sealing ring (450) is abutted between the plate body (410) and the first ring block (420).

6. The double eccentric butterfly valve according to claim 3, characterized in that: The outer peripheral side of the valve body (100) is provided with a first valve seat (110) and a second valve seat (120), and the first valve seat (110) and the second valve seat (120) are symmetrically arranged; the valve stem (300) comprises a first rod body (310) and a second rod body (320), the first rod body (310) is rotatably inserted into the first valve seat (110) and is provided with at least one first rod clamping groove (330), the second rod body (320) is rotatably inserted into the second valve seat (120) and is provided with at least one second rod clamping groove (340); the valve plate (4 00) also includes a first connecting block (460) and a second connecting block (470), wherein the first connecting block (460) is connected to the plate body (410) and is provided with at least one first clamping groove (480), and at least one first clamping groove (480) and at least one first rod clamping groove (330) are arranged in a one-to-one correspondence, and the second connecting block (470) is connected to the plate body (410) and is provided with at least one second clamping groove (490), and at least one second clamping groove (490) and at least one second rod clamping groove (340) are arranged in a one-to-one correspondence.

7. The double eccentric butterfly valve according to any one of claims 1 to 6, characterized in that: A main sealing ring (700) is clamped on the inner circumference of the valve body (100).

Images