A butterfly valve

Abstract

The present application relates to the technical field of butterfly valves, and provides a butterfly valve. The butterfly valve includes a valve body, a lower valve stem cylinder, a lower valve stem, a plurality of butterfly plates, and an upper valve stem. One end of the lower valve stem cylinder perpendicular to the axis of the valve body is arranged on the side wall of the valve body; the lower valve stem cylinder is provided with a lower valve stem cavity along its own axis direction, and the lower valve stem cavity communicates with the fluid passage; the lower valve stem is movably arranged in the lower valve stem cavity along the direction perpendicular to the axis of the valve body; the plurality of butterfly plates are detachably arranged on the lower valve stem; the upper valve stem arranged opposite to and in contact with the lower valve stem is rotatably inserted through the valve body; wherein, the upper valve stem is used to push the first end of the lower valve stem towards the lower valve stem cylinder, so that the lower valve stem sequentially disengages from the butterfly plates, and the upper valve stem sequentially passes through at least one butterfly plate, and then drives the butterfly plates to rotate through the upper valve stem. The butterfly valve provided by the present application can enable the stratified fluid to pass through sequentially according to the stratification depth, or enable the stratified fluid to be fully mixed, and improve the adjustment accuracy of the opening and closing of the butterfly valve.

Description

Technical Field

[0001] This application relates to the technical field of butterfly valves, and particularly to a butterfly valve. Background Art

[0002] A butterfly valve is a valve that controls the rotation of a valve plate around a valve shaft to cut off and throttle fluids in a pipeline system.

[0003] In the related art, a butterfly valve can only cut off or allow all fluids in a pipeline to flow through by controlling the valve plate. However, some pipelines contain multiple fluids, and there are situations where stratification or mixing is required. In such cases, it may be necessary to drain the fluids and then perform stratification separation or mixing separately. The butterfly valve cannot discharge the mixed fluids in layers, nor can it mix the stratified fluids and then discharge them. Summary of the Invention

[0004] An embodiment of this application provides a butterfly valve, which can improve the technical problem that the butterfly valve in the related art cannot separate or mix multiple fluids in a pipeline.

[0005] An embodiment of this application provides a butterfly valve, including:

[0006] A valve body, which is provided with a fluid passage along its own axis direction;

[0007] A lower valve stem cylinder, one end of which is arranged on the side wall of the valve body, and the axis of the lower valve stem cylinder is perpendicular to the axis of the valve body; the lower valve stem cylinder is provided with a lower valve stem cavity along its own axis direction, and the lower valve stem cavity communicates with the fluid passage;

[0008] A lower valve stem, which is movably arranged in the lower valve stem cavity along a direction perpendicular to the axis of the valve body; a part of the lower valve stem can move from the lower valve stem cavity into the fluid passage;

[0009] Multiple valve plates, which are detachably arranged on the lower valve stem; the outer arc surfaces of the multiple valve plates can respectively fit against the inner wall of the valve body when the butterfly valve is closed;

[0010] An upper valve stem, which is arranged opposite to the lower valve stem, and the upper valve stem is rotatably penetrated through the valve body; the first end of the upper valve stem abuts against the first end of the lower valve stem; the upper valve stem can respectively penetrate through the multiple valve plates, so that the multiple valve plates respectively follow the upper valve stem to rotate to different angles; and

[0011] A reset device, which is arranged in the lower valve stem cavity, and the reset device is used to push the lower valve stem towards the upper valve stem so that the lower valve stem keeps abutting against the upper valve stem;

[0012] Wherein, the upper valve stem is used to push the first end of the lower valve stem towards the lower valve stem cylinder, so that the lower valve stem is successively disengaged from at least one of the butterfly plates, and the upper valve stem successively passes through at least one of the butterfly plates, and then drives at least one of the butterfly plates to rotate through the upper valve stem, and makes the plurality of butterfly plates rotate to different angles respectively.

[0013] In the technical solution described above in the embodiments of the present application, at least the following technical effects are achieved:

[0014] The butterfly valve provided by the embodiment of the present application is provided with a lower valve stem cylinder on the outer wall of the valve body, a lower valve stem cavity communicating with the fluid passage of the valve body is opened in the lower valve stem cylinder, a lower valve stem capable of moving into the fluid passage along the axis direction of the lower valve stem cylinder is arranged in the lower valve stem cavity, a plurality of butterfly plates are detachably arranged on the lower valve stem, the upper valve stem is rotatably arranged through the valve body and is oppositely arranged with the lower valve stem, the upper valve stem can push the first end of the lower valve stem into the lower valve stem cavity, and successively passes through a plurality of butterfly plates. By the upper valve stem passing through different butterfly plates respectively, the plurality of butterfly plates can be rotated to different angles respectively, so that the stratified fluid can pass through successively according to the stratification depth, or the stratified fluid can form a vortex when flowing through the butterfly valve through the plurality of butterfly plates at different angles, thereby realizing mixing. In this way, the butterfly valve can adapt to complex working conditions, optimize the fluid mechanics characteristics of the butterfly valve, and improve the adjustment accuracy of the opening and closing of the butterfly valve.

[0015] In some embodiments, the plurality of butterfly plates include:

[0016] Two end butterfly plates, the end butterfly plates are detachably arranged on the lower valve stem, the two end butterfly plates are arranged at intervals relatively, and one end of the end butterfly plate is attached to the inner wall of the valve body; and

[0017] A middle butterfly plate, the middle butterfly plate is detachably arranged on the lower valve stem; the middle butterfly plate is arranged between the two end butterfly plates, and both ends of the middle butterfly plate in the axial direction of the lower valve stem are respectively abutted against the other ends of the end butterfly plates.

[0018] In some embodiments, the end butterfly plate includes:

[0019] A first butterfly plate body, the first butterfly plate body is detachably arranged on the lower valve stem in sequence;

[0020] An arc end part, the arc end part is arranged at one end of the first butterfly plate body; the arc end part is arc-shaped so as to be able to fit against the inner wall of the valve body; a part of the arc end part is always in contact with the inner wall of the valve body; and

[0021] A first flat end part, the first flat end part is arranged at the other end of the first butterfly plate body;

[0022] The middle butterfly plate includes:

[0023] A plurality of second butterfly plate bodies, and the plurality of second butterfly plate bodies are sequentially detachably arranged on the lower valve stem along the axial direction of the lower valve stem; the plurality of second butterfly plate bodies are arranged between the two end butterfly plates; the plurality of second butterfly plate bodies can rotate relative to each other;

[0024] A plurality of arc side portions, and the number of the arc side portions is twice the number of the second butterfly plate bodies; the plurality of arc side portions are respectively arranged on both sides of the plurality of second butterfly plate bodies along the direction perpendicular to the axis of the lower valve stem; the plurality of arc side portions can respectively fit against the inner side of the valve body;

[0025] A plurality of second flat end portions, and the number of the second flat end portions is the same as the number of the second butterfly plate bodies; the plurality of second flat end portions are arranged at one end of the plurality of second butterfly plate bodies in one-to-one correspondence along the axial direction of the lower valve stem; and

[0026] A plurality of third flat end portions, and the number of the third flat end portions is the same as the number of the second butterfly plate bodies; the plurality of third flat end portions are arranged at the other end of the plurality of second butterfly plate bodies in one-to-one correspondence along the axial direction of the lower valve stem;

[0027] Wherein, among the second flat end portion and the third flat end portion respectively arranged at both ends of one of the second butterfly plate bodies, the end face area of the second flat end portion is less than or equal to the end face area of the third flat end portion; the plurality of second butterfly plate bodies are arranged from small to large along the axial direction of the lower valve stem from the end butterfly plate to the center of the valve body according to the end face areas of the plurality of second flat end portions or the end face areas of the plurality of third flat end portions; the second flat end portion of one of the middle butterfly plates abuts against the first flat end portion of the adjacent end butterfly plate or the third flat end portion of the adjacent middle butterfly plate; the third flat end portion of one of the middle butterfly plates abuts against the second flat end portion of the adjacent middle butterfly plate or the third flat end portion of the adjacent middle butterfly plate.

[0028] In some embodiments, a first through hole is formed in the butterfly plate along the axial direction of the lower valve stem; a plurality of butterfly plate key grooves are formed in the inner wall of the first through hole along its circumferential direction, the length direction of the butterfly plate key grooves is parallel to the axial direction of the lower valve stem, and the plurality of butterfly plate key grooves are spaced apart from each other.

[0029] In some embodiments, a lower valve stem key groove is formed in the inner wall of the lower valve stem cylinder along the direction perpendicular to the axis of the valve body;

[0030] The lower valve stem includes:

[0031] The lower valve stem body is movably disposed in the lower valve stem cavity in a direction perpendicular to the axis of the valve body; a part of the lower valve stem body can move from the lower valve stem cavity into the fluid passage;

[0032] The lower valve stem key is disposed on the outer surface of the lower valve stem body along the length direction of the lower valve stem body; the lower valve stem key can move into the lower valve stem key groove and the butterfly plate key groove, and the outer side surface of the lower valve stem key can be in contact with the inner side surfaces of the lower valve stem key groove and the butterfly plate key groove; and

[0033] The first limiting member is disposed at the second end of the lower valve stem body, and the first limiting member is used to limit the second end of the lower valve stem body from entering the fluid passage;

[0034] Wherein, when the lower valve stem key moves into the butterfly plate key groove, the lower valve stem is used to make the butterfly plate unable to rotate and be in a fixed angle.

[0035] In some embodiments, the upper valve stem includes:

[0036] The upper valve stem body is disposed opposite to the lower valve stem, and the upper valve stem body is rotatably passed through the valve body;

[0037] The upper valve stem key is disposed on the outer surface of the upper valve stem body along the length direction of the upper valve stem body; the upper valve stem key can move into the butterfly plate key groove, and the outer side surface of the upper valve stem key can be in contact with the inner side surface of the butterfly plate key groove; and

[0038] The second limiting member is disposed at the second end of the upper valve stem body, and the second limiting member is used to limit the second end of the upper valve stem body from entering the fluid passage and limit the first end of the upper valve stem body from entering the lower valve stem cavity.

[0039] In some embodiments, the butterfly valve further includes a ratchet valve cover, the ratchet valve cover is disposed on a side of the valve body away from the lower valve stem cylinder, the ratchet valve cover is provided with a second through hole, and a valve cover key groove is formed on the inner wall of the second through hole along the axis direction of the lower valve stem;

[0040] Wherein, the inner side surface of the valve cover key groove can be in contact with the outer side surface of the upper valve stem key; the ratchet valve cover is used to rotate the upper valve stem at a fixed angle.

[0041] In some embodiments, the upper valve stem further includes an abutting portion. One end of the abutting portion is disposed at one end of the upper valve stem body facing the lower valve stem, and the other end of the abutting portion abuts against the first end of the lower valve stem; the diameter of the abutting portion is smaller than that of the upper valve stem body; the distance that the abutting portion protrudes from the end face of the first end of the upper valve stem is smaller than the height of the butterfly plate along the axis direction of the lower valve stem.

[0042] Wherein, the abutting portion is used to prevent the lower valve stem key and the upper valve stem key from being in the same butterfly plate keyway.

[0043] In some embodiments, the upper valve stem includes a plurality of scale marks; the number of the scale marks is the same as the number of the butterfly plates, and the plurality of scale marks correspond to the plurality of butterfly plates one by one; the plurality of scale marks are spaced along the length direction of the upper valve stem body, and the distance between two adjacent scale marks is equal to the height of the butterfly plate along the axis direction of the lower valve stem; the scale marks are used to identify the positions where the end face of the first end of the upper valve stem can respectively coincide with the end faces of the respective butterfly plates facing the lower valve stem body, so that the end face of the first end of the upper valve stem can move to respectively coincide with the end faces of the respective butterfly plates facing the lower valve stem body.

[0044] In some embodiments, the butterfly valve further includes at least one fluid viewer, and the fluid viewer is disposed on the butterfly plate, and the fluid viewer is used to detect the mixing condition of the fluid and the liquid level height of the fluid. Description of the Drawings

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0046] Figure 1 Structural schematic diagram of the butterfly valve provided by the embodiment of the present application;

[0047] Figure 2 Structural schematic diagram of the valve body of the butterfly valve provided by the embodiment of the present application;

[0048] Figure 3 Structural schematic diagram of the end butterfly plate provided by the embodiment of the present application;

[0049] Figure 4 Structural schematic diagram of the middle butterfly plate provided by the embodiment of the present application;

[0050] Figure 5Schematic diagram of the structure in which the lower valve stem of the present application embodiment passes through a part of the butterfly plate;

[0051] Figure 6 Schematic diagram of the structure in which the upper valve stem of the present application embodiment passes through a part of the butterfly plate.

[0052] Among them, each reference numeral in the figure:

[0053] 100, butterfly valve; 10, valve body; 101, fluid passage; 20, lower valve stem cylinder; 201, lower valve stem cavity; 202, lower valve stem keyway; 30, lower valve stem; 301, lower valve stem body; 302, lower valve stem key; 303, first limiting member; 40, butterfly plate; 401, end butterfly plate; 4011, first butterfly plate body; 4012, arc end; 4013, first flat end; 402, first through hole; 403, butterfly plate keyway; 404, middle butterfly plate; 4041, second butterfly plate body; 4042, arc side; 4043, second flat end; 4044, third flat end; 50, upper valve stem; 501, upper valve stem body; 502, upper valve stem key; 503, second limiting member; 504, abutting portion; 60, ratchet valve cover; 601, second through hole; 602, valve cover keyway. Detailed implementation manners

[0054] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below with reference to the 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.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0056] 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.

[0057] It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0058] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0059] In the present application, "and / or" is merely a correlative relationship describing associated objects, indicating that three relationships may exist; for example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0060] It should be noted that in the present application, words such as "in some embodiments", "exemplarily", "for example", etc. are used to give examples, illustrations, or explanations. Any embodiment or design solution described as "in some embodiments", "exemplarily", "for example" in the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Precisely, the use of words such as "in some embodiments", "exemplarily", "for example" is intended to present relevant concepts in a specific manner, meaning that the specific features, structures, or characteristics described in combination with the embodiments may be included in at least one embodiment of the present application. The appearance of the above words at various positions in the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0061] A butterfly valve is a valve that controls the rotation of a valve plate around a valve shaft to achieve the cutting off and throttling of fluids in a pipeline system.

[0062] In the related art, a butterfly valve can only cut off or allow all fluids in a pipeline to flow through by controlling the valve plate. However, some pipelines contain multiple fluids, and there are situations where stratification or mixing is required. In such cases, it may be necessary to drain the fluids and then perform stratification separation or mixing separately. However, a butterfly valve cannot discharge stratified fluids in layers, nor can it mix stratified fluids and then discharge them.

[0063] Based on this, to solve the problem in the related art that the butterfly valve cannot separate or mix multiple fluids in the pipeline, the embodiments of the present application provide the following solutions.

[0064] Please refer to Figures 1 to 6 , the embodiments of the present application provide a butterfly valve 100, which includes a valve body 10, a lower valve stem cylinder 20, a lower valve stem 30, a plurality of butterfly plates 40, an upper valve stem 50 and a reset device. The valve body 10 is provided with a fluid passage 101 along its own axis direction. One end of the lower valve stem cylinder 20 is arranged on the side wall of the valve body 10, and the axis of the lower valve stem cylinder 20 is perpendicular to the axis of the valve body 10. The lower valve stem cylinder 20 is provided with a lower valve stem cavity 201 along its own axis direction, and the lower valve stem cavity 201 communicates with the fluid passage 101. The lower valve stem 30 is movably arranged in the lower valve stem cavity 201 along a direction perpendicular to the axis of the valve body 10; a part of the lower valve stem 30 can move from the lower valve stem cavity 201 into the fluid passage 101. The plurality of butterfly plates 40 are detachably arranged on the lower valve stem 30. The outer arc surfaces of the plurality of butterfly plates 40 can be respectively attached to the inner wall of the valve body 10 when the butterfly valve 100 is closed. The upper valve stem 50 is arranged opposite to the lower valve stem 30, and the upper valve stem 50 is rotatably passed through the valve body 10. The first end of the upper valve stem 50 abuts against the first end of the lower valve stem 30; the upper valve stem 50 can respectively pass through the plurality of butterfly plates 40, so that the plurality of butterfly plates 40 respectively rotate to different angles following the upper valve stem 50. The reset device is arranged in the lower valve stem cavity 201, and the reset device is used to push the lower valve stem 30 towards the upper valve stem 50 so that the lower valve stem 30 remains in contact with the upper valve stem 50. Among them, the upper valve stem 50 is used to push the first end of the lower valve stem 30 towards the lower valve stem cylinder 20, so that the lower valve stem 30 sequentially disengages from at least one butterfly plate 40, and the upper valve stem 50 sequentially passes through at least one butterfly plate 40, and then drives at least one butterfly plate 40 to rotate through the upper valve stem 50 and makes the plurality of butterfly plates 40 respectively rotate to different angles.

[0065] It can be understood that the valve body 10 is a component for connecting pipelines and providing an installation basis for other components. The material of the valve body 10 can be gray cast iron, ductile iron, etc., but is not limited thereto. The projection of the fluid passage 101 in the axis direction of the valve body 10 is circular. The plurality of butterfly plates 40 can be respectively attached to the inner wall of the valve body 10 so that the fluid cannot pass through the fluid passage 101.

[0066] The upper valve stem 50 is a component for pushing the first end of the lower valve stem 30 into the lower valve stem cylinder 20 and rotating the butterfly plate 40. A through hole can be opened on the valve body 10, and the upper valve stem 50 is passed through the through hole, so that the upper valve stem 50 can be in sliding contact with the valve body 10 and can rotate relative to the valve body 10, or a bearing can be arranged on the valve body 10, and the upper valve stem 50 is passed through the bearing, so that the upper valve stem 50 can be in sliding contact with the bearing and rotate relative to the valve body 10 through the bearing, but is not limited thereto.

[0067] The reset device is a component used to push the lower valve stem 30 towards the upper valve stem 50 so that the lower valve stem 30 remains in contact with the upper valve stem 50. For example, the reset device can be an elastic member. The elastic member is arranged on the side of the lower valve stem cavity 201 away from the upper valve stem 50. When the elastic member is in its natural state without being pressurized, the first end of the lower valve stem 30 fits against the inner side wall of the valve body 10 away from the lower valve stem cylinder 20, and the second end of the lower valve stem 30 abuts against one end of the elastic member; or the reset device can be a magnet. A magnet is arranged on the side of the lower valve stem cavity 201 away from the upper valve stem 50, and a magnet is arranged at the second end of the lower valve stem 30. The like poles of the two magnets face each other, so that the lower valve stem 30 is always subjected to a repulsive force towards the upper valve stem 50, but it is not limited to this.

[0068] As can be seen from the above, for the butterfly valve 100 provided by the embodiment of the present application, by arranging the lower valve stem cylinder 20 on the outer side wall of the valve body 10, opening a lower valve stem cavity 201 communicating with the fluid passage 101 of the valve body 10 in the lower valve stem cylinder 20, arranging a lower valve stem 30 capable of moving into the fluid passage 101 along the axis direction of the lower valve stem cylinder 20 in the lower valve stem cavity 201, detachably arranging a plurality of butterfly plates 40 on the lower valve stem 30, the upper valve stem 50 is rotatably inserted through the valve body 10 and is arranged opposite to the lower valve stem 30. The upper valve stem 50 can push the first end of the lower valve stem 30 into the lower valve stem cavity 201 and respectively pass through a plurality of butterfly plates 40. By the upper valve stem 50 passing through different butterfly plates 40 respectively, the plurality of butterfly plates 40 can be rotated to different angles respectively, so that the stratified fluid can pass through in sequence according to the stratification depth, or the stratified fluid can form a vortex when flowing through the butterfly valve 100 through the plurality of butterfly plates 40 at different angles, and then be fully mixed. In this way, the butterfly valve 100 can adapt to complex working conditions, optimize the fluid mechanics characteristics of the butterfly valve 100, and improve the adjustment accuracy of the opening and closing of the butterfly valve 100.

[0069] In some embodiments, please refer to Figure 1 and Figure 2 , the plurality of butterfly plates 40 include two end butterfly plates 401 and a middle butterfly plate 404. The end butterfly plates 401 are detachably arranged on the lower valve stem 30. The two end butterfly plates 401 are arranged relatively spaced apart. One end of the end butterfly plate 401 fits against the inner wall of the valve body 10; the middle butterfly plate 404 is detachably arranged on the lower valve stem 30; the middle butterfly plate 404 is arranged between the two end butterfly plates 401, and both ends of the middle butterfly plate 404 in the axis direction of the lower valve stem 30 respectively abut against the other ends of the end butterfly plates 401.

[0070] It can be understood that the butterfly plate 40 abuts against other adjacent butterfly plates 40. The shape formed by the multiple butterfly plates 40 is the same as the projection shape of the fluid passage 101 in the axial direction of the valve body 10 itself, so that the multiple butterfly plates 40 can close the fluid passage 101. The end butterfly plate 401 is the butterfly plate 40 located at both ends along the axial direction of the lower valve stem 30 among the multiple butterfly plates 40, and the middle butterfly plate 404 is the butterfly plate 40 between the two end butterfly plates 401.

[0071] With such a setting, by detachably arranging two end butterfly plates 401 and one middle butterfly plate 404 on the lower valve stem 30 along the axial direction of the lower valve stem 30, the adjustment accuracy of the opening and closing of the butterfly valve 100 for the passing flow rate can be improved. By independently adjusting the position of each butterfly plate 40, the tight fit of the sealing surfaces of each butterfly plate 40 can be better achieved, the sealing performance of the butterfly valve 100 can be improved, and thus the reliability and durability of the butterfly valve 100 can be improved. And by performing maintenance according to the specific damaged part, the difficulty and cost of maintaining the butterfly valve 100 can be reduced.

[0072] Optionally, in some embodiments, please refer to Figure 1 , Figure 3 and Figure 4 , the end butterfly plate 401 includes a first butterfly plate body 4011, an arc end portion 4012 and a first flat end portion 4013. The first butterfly plate body 4011 is detachably arranged on the lower valve stem 30 in sequence; the arc end portion 4012 is arranged at one end of the first butterfly plate body 4011; the arc end portion 4012 is arc-shaped so as to be able to fit against the inner wall of the valve body 10; a part of the arc end portion 4012 always fits against the inner wall of the valve body 10; the first flat end portion 4013 is arranged at the other end of the first butterfly plate body 4011.

[0073] The middle butterfly plate 404 includes a plurality of second butterfly plate bodies 4041, a plurality of arc-shaped side portions 4042, a plurality of second flat end portions 4043, and a plurality of third flat end portions 4044. The plurality of second butterfly plate bodies 4041 are sequentially detachably arranged on the lower valve stem 30 along the axial direction of the lower valve stem 30; the plurality of second butterfly plate bodies 4041 are arranged between the two end butterfly plates 401; the plurality of second butterfly plate bodies 4041 can rotate relative to each other; the number of the arc-shaped side portions 4042 is twice the number of the second butterfly plate bodies 4041; the plurality of arc-shaped side portions 4042 are respectively arranged on both sides of the plurality of second butterfly plate bodies 4041 along the direction perpendicular to the axis of the lower valve stem 30; the plurality of arc-shaped side portions 4042 can respectively fit against the inner side of the valve body 10; the plurality of second flat end portions 4043 are arranged at one end of the plurality of second butterfly plate bodies 4041 one by one along the axial direction of the lower valve stem 30; the plurality of third flat end portions 4044 are arranged at the other end of the plurality of second butterfly plate bodies 4041 one by one along the axial direction of the lower valve stem 30; wherein, among the second flat end portion 4043 and the third flat end portion 4044 respectively arranged at both ends of a second butterfly plate body 4041, the end face area of the second flat end portion 4043 is less than or equal to the end face area of the third flat end portion 4044; the plurality of second butterfly plate bodies 4041 are arranged from small to large from the end butterfly plate 401 along the axial direction of the lower valve stem 30 towards the center of the valve body 10 according to the end face area of the plurality of second flat end portions 4043 or the end face area of the plurality of third flat end portions 4044; the second flat end portion 4043 of a middle butterfly plate 404 abuts against the first flat end portion 4013 of the adjacent end butterfly plate 401 or the third flat end portion 4044 of the adjacent middle butterfly plate 404; the third flat end portion 4044 of a middle butterfly plate 404 abuts against the second flat end portion 4043 of the adjacent middle butterfly plate 404 or the third flat end portion 4044 of the adjacent middle butterfly plate 404.

[0074] It can be understood that the first butterfly plate body 4011 is the main structure of the end butterfly plate 401 for carrying the arc end portion 4012. The material of the first butterfly plate body 4011 can be stainless steel or plastic, but is not limited thereto. The arc end portion 4012 is arranged at one end of the first butterfly plate body 4011 along the axial direction of the lower valve stem 30. The arc end portion 4012 is arc-shaped and can be an arc surface so as to be able to fit against the arc-shaped inner wall of the valve body 10. The first flat end portion 4013 is arranged at the other end of the first butterfly plate body 4011 to abut against the middle butterfly plate 404 and can be a plane. A plurality of second butterfly plate bodies 4041 are the main structures of the middle butterfly plate 404 for carrying two arc side portions 4042, a second flat end portion 4043 and a third flat end portion 4044. The material of the second butterfly plate bodies 4041 can be the same as that of the first butterfly plate body 4011. The two arc side portions 4042 are respectively arranged at both ends of the second butterfly plate body 4041 along the direction perpendicular to the axis of the lower valve stem 30. The arc side portions 4042 can be arc surfaces for fitting against the inner side of the valve body 10 when the butterfly valve 100 is closed. The second flat end portion 4043 and the third flat end portion 4044 are respectively arranged at both ends of the second butterfly plate body 4041 along the axis direction of the lower valve stem 30, and both the second flat end portion 4043 and the third flat end portion 4044 can be planes.

[0075] Optionally, please refer to Figure 1 , the number of the second butterfly plate bodies 4041 is four, the number of the arc side portions 4042 is eight, the number of the second flat end portions 4043 is four, and the number of the third flat end portions 4044 is four.

[0076] With such an arrangement, a plurality of second butterfly plate bodies 4041 are arranged from the end butterfly plate 401 to the center of the valve body 10 along the axis direction of the lower valve stem 30 in ascending order according to the end face area of the plurality of second flat end portions 4043 or the end face area of the plurality of third flat end portions 4044. The second flat end portions 4043 or the third flat end portions 4044 located at both ends of the middle butterfly plate 404 respectively abut against the first flat end portions 4013 of the two end butterfly plates 401. Each first butterfly plate body 4011 and second butterfly plate body 4041 can rotate to the same or different angles, which can improve the regulation ability of the valve body 10 on the passing fluid, optimize the fluid transmission efficiency, reduce energy loss, improve the heat exchange efficiency, reduce the friction between different layers of the fluid, thereby reducing the corrosion and wear of the pipeline and equipment, and improving the safety and reliability of the butterfly valve 100.

[0077] In some embodiments, please refer to Figure 3 and Figure 4 , a first through hole 402 is formed in the butterfly plate 40 along the axis direction of the lower valve stem 30; a plurality of butterfly plate key grooves 403 are formed in the inner wall of the first through hole 402 along the circumferential direction of the first through hole 402. The length direction of the butterfly plate key grooves 403 is parallel to the axis direction of the lower valve stem 30, and the plurality of butterfly plate key grooves 403 are spaced apart from each other.

[0078] It can be understood that the inner wall of the first through hole 402 fits against the outer wall of the lower valve stem 30 or the outer wall of the upper valve stem 50. The length of the butterfly plate key slot 403 is the same as the height of the butterfly plate 40.

[0079] With such a setting, by providing a first through hole 402 along the axis of the lower valve stem 30 in the butterfly plate 40 and providing a plurality of butterfly plate key slots 403 along the circumferential direction of the inner wall of the first through hole 402 with the length direction parallel to the axis of the lower valve stem 30, and the plurality of butterfly plate key slots 403 being spaced apart, the butterfly plate can be fixed at the same or different angles through the plurality of butterfly plate key slots 403, which can improve the sealing effect of the butterfly valve 100, enhance the positioning strength of each butterfly plate 40, improve the accuracy of operation, reduce the friction between the butterfly plate 40 and the valve seat, and extend the service life of the butterfly valve 100.

[0080] In some embodiments, please refer to Figure 1 、 Figure 2 and Figure 5 , a lower valve stem key slot 202 is provided in the inner wall of the lower valve stem cylinder 20 along a direction perpendicular to the axis of the valve body 10; the lower valve stem 30 includes a lower valve stem body 301, a lower valve stem key 302 and a first limiting member 303, and the lower valve stem body 301 is movably disposed in the lower valve stem cavity 201 along a direction perpendicular to the axis of the valve body 10; a part of the lower valve stem body 301 can move from the lower valve stem cavity 201 into the fluid passage 101; the lower valve stem key 302 is disposed on the outer surface of the lower valve stem body 301 along the length direction of the lower valve stem body 301; the lower valve stem key 302 can move into the lower valve stem key slot 202 and the butterfly plate key slot 403, and the outer side surface of the lower valve stem key 302 can fit against the inner side surface of the lower valve stem key slot 202 and the inner side surface of the butterfly plate key slot 403; the first limiting member 303 is disposed at the second end of the lower valve stem body 301, and the first limiting member 303 is used to limit the second end of the lower valve stem body 301 from entering the fluid passage 101; wherein, when the lower valve stem key 302 moves into the butterfly plate key slot 403, the lower valve stem 30 is used to prevent the butterfly plate 40 from rotating and keep it at a fixed angle.

[0081] It can be understood that the lower valve stem body 301 is a component for passing through each butterfly plate 40. The outer surface of the lower valve stem body 301 can directly slide in contact with the inner side surface of the lower valve stem cylinder 20. The lower valve stem body 301 can be a cylinder or a cuboid, but is not limited thereto. The length of the lower valve stem body 301 is equal to the inner diameter length of the valve body 10. The lower valve stem key 302 is a component for moving in the lower valve stem keyway 202 and the butterfly plate keyway 403 and preventing the butterfly plate 40 passed through by the lower valve stem 30 from rotating. The lower valve stem key 302 can be a flat key or a wedge key, but is not limited thereto. The lower valve stem keyway 202 and the butterfly plate keyway 403 adopt a structure matching the lower valve stem key 302, so that the outer side surface of the lower valve stem key 302 can be attached to the inner side surfaces of the lower valve stem keyway 202 and the butterfly plate keyway 403. The first limiting member 303 is a component for preventing the second end of the lower valve stem body 301 from entering the fluid passage 101. For example, the first limiting member 303 can be a limiting block provided with a spring at one end. By opening a concave hole at one end of the lower valve stem cavity 201 close to the fluid passage 101, the spring of the first limiting member 303 can be connected to the second end of the lower valve stem body 301. The spring can expand and contract in a direction perpendicular to the axis of the lower valve stem body 301. The limiting block abuts against the inner side wall of the lower valve stem cylinder 20 under the push of the spring. When the second end of the lower valve stem body 301 moves to one end of the lower valve stem cavity 201 close to the flow passage, the spring can push the limiting block into the concave hole, preventing the second end of the lower valve stem body 301 from entering the fluid passage 101; or the first limiting member 303 can be a magnet. The first limiting member 303 is arranged at the second end of the lower valve stem body 301, and another magnet is arranged at one end of the lower valve stem cavity 201 close to the fluid passage 101. When the second end of the lower valve stem body 301 moves to one end of the lower valve stem cavity 201 close to the flow passage, the two magnets can attract each other, preventing the second end of the lower valve stem body 301 from entering the fluid passage 101, but is not limited thereto.

[0082] With such a setting, by opening the first through hole 402 and the butterfly plate keyway 403 on the butterfly plate 40, opening the lower valve stem keyway 202 on the inner side wall of the lower valve stem cylinder 20, arranging the lower valve stem key 302 on the outer surface of the lower valve stem body 301, and arranging the first limiting member 303 at the second end of the lower valve stem body 301, and moving the lower valve stem body 301 to make the lower valve stem key 302 enter the butterfly plate keyway 403, so that the butterfly plate 40 cannot rotate and is in a fixed angle, the sealing effect of the butterfly valve 100 can be improved, fluid leakage can be prevented, the use safety can be ensured, the operation accuracy can be improved, the friction between the butterfly plate 40 and the valve seat can be reduced, and the service life of the butterfly valve 100 can be extended.

[0083] Optionally, in some embodiments, please refer to Figure 1 and Figure 6, the upper valve stem 50 includes an upper valve stem body 501, an upper valve stem key 502, and a second limiting member 503. The upper valve stem body 501 is disposed opposite to the lower valve stem 30, and the upper valve stem body 501 is rotatably inserted through the valve body 10; the upper valve stem key 502 is disposed on the outer surface of the upper valve stem body 501 along the length direction of the upper valve stem body 501; the upper valve stem key 502 can move into the butterfly plate key slot 403, and the outer side surface of the upper valve stem key 502 can be in contact with the inner side surface of the butterfly plate key slot 403; the second limiting member 503 is disposed at the second end of the upper valve stem body 501, and the second limiting member 503 is used to limit the second end of the upper valve stem body 501 from entering the fluid passage 101 and limit the first end of the upper valve stem body 501 from entering the lower valve stem cavity 201.

[0084] It can be understood that the upper valve stem body 501 is a component for pushing the lower valve stem body 301 into the lower valve stem cylinder 20 and sequentially passing through each butterfly plate 40. For example, the upper valve stem body 501 can adopt a cylindrical structure, and the outer side surface of the upper valve stem body 501 is in direct sliding contact with the inner side surface of the first through hole 402 of the butterfly plate 40; or the upper valve stem body 501 can adopt a cuboid structure, and a square hole bearing is provided on the valve body 10, the upper valve stem body 501 is inserted through the square hole bearing and then sequentially through each butterfly plate 40, but not limited thereto. The length of the upper valve stem body 501 is equal to the inner diameter length of the valve body 10. The upper valve stem key 502 is a component for transmitting the torque of the rotation of the upper valve stem body 501, and the upper valve stem key 502 can adopt the same structure as the lower valve stem key 302. The upper valve stem key 502 can be inserted through any butterfly plate key slot 403 of the butterfly valve 100, so that only the butterfly plate 40 penetrated by the upper valve stem body 501 can rotate with the upper valve stem body 501. The second limiting member 503 can adopt the same structure as the first limiting member 303 to limit the second end of the upper valve stem body 501 from entering the fluid passage 101.

[0085] With such a setting, by providing the upper valve stem key 502 on the outer surface of the upper valve stem body 501, when the first end of the upper valve stem body 501 pushes the first end of the lower valve stem body 301 toward the lower valve stem cavity 201, the end surface of the first end of the upper valve stem body 501 coincides with the end surface of the butterfly plate 40 closest to the lower valve stem cylinder 20 among all the butterfly plates 40 penetrated by the upper valve stem body 501, so that the butterfly plate 40 penetrated by the upper valve stem body 501 can rotate with the upper valve stem body 501, and the butterfly plate 40 is provided with a plurality of butterfly plate key slots 403, and the upper valve stem key 502 can enter any butterfly plate key slot 403 of the butterfly plate 40, so that different butterfly plates 40 are at different angles, which can realize more precise control of the fluid passing through the butterfly valve 100, improve the adjustment accuracy of the butterfly valve 100, improve the sealing performance, reduce the operating torque, improve the flexibility of the valve, and improve the control efficiency of the butterfly valve 100 for the fluid.

[0086] Optionally, please refer to Figure 1 and Figure 2, the butterfly valve 100 further includes a ratchet valve cover 60. The ratchet valve cover 60 is disposed on a side of the valve body 10 away from the lower valve stem cylinder 20. The ratchet valve cover 60 is provided with a second through hole 601, and a valve cover keyway 602 is formed on the inner wall of the second through hole 601 along the axis direction of the lower valve stem 30. Wherein, the inner side surface of the valve cover keyway 602 can be attached to the outer side surface of the upper valve stem key 502; the ratchet valve cover 60 is used to rotate the upper valve stem 50 at a fixed angle.

[0087] It can be understood that the ratchet valve cover 60 is a component for rotating the upper valve stem 50 at a preset fixed angle. The number of preset fixed angles is the same as the number of the butterfly plate keyways 403, so that when the upper valve stem body 501 rotates to any angle, the groove of the upper valve stem key 502 can enter the butterfly plate keyway 403. The axis of the ratchet is collinear with the axis of the lower valve stem cylinder 20, and the axis of the second through hole 601 is collinear with the axis of the lower valve stem 30. The lower valve stem keyway 202 is used to cooperate with the upper valve stem key 502 so that the upper valve stem body 501 can pass through the second through hole 601.

[0088] With such a setting, by providing the ratchet valve cover 60 on the valve body 10, the upper valve stem 50 can rotate at a preset fixed angle, and when the upper valve stem body 501 rotates to any angle, the groove of the upper valve stem key 502 can enter the butterfly plate keyway 403. This simplifies the operation difficulty of the butterfly valve 100, improves the operation efficiency of adjusting the butterfly valve 100, improves the adjustment accuracy of the butterfly valve 100, speeds up the response speed of the adjustment of the butterfly valve 100, enables the butterfly valve 100 to cope with different working conditions, and improves the adaptability and safety of the butterfly valve 100.

[0089] In some embodiments, please refer to Figure 1 and Figure 6 , the upper valve stem 50 further includes an abutting portion 504. One end of the abutting portion 504 is disposed at one end of the upper valve stem body 501 facing the lower valve stem 30, and the other end of the abutting portion 504 abuts against the first end of the lower valve stem 30; the diameter of the abutting portion 504 is smaller than that of the upper valve stem body 501; the distance that the abutting portion 504 protrudes from the end face of the first end of the upper valve stem 50 is smaller than the height of the butterfly plate 40 along the axis direction of the lower valve stem 30. Wherein, the abutting portion 504 is used to prevent the lower valve stem key 302 and the upper valve stem key 502 from being in the same butterfly plate keyway 403.

[0090] It can be understood that the abutting portion 504 is a component for preventing the lower valve stem key 302 and the upper valve stem key 502 from being in the same butterfly plate keyway 403. The abutting portion 504 can adopt a structure whose projection along the axis direction of the upper valve stem 50 is the same as that of the upper valve stem body 501, or can adopt a cylinder with a diameter smaller than that of the upper valve stem 50, but is not limited thereto.

[0091] With such a setting, by providing an abutting portion 504 at one end of the upper valve stem body 501 facing the lower valve stem 30, the abutting portion 504 separates the upper valve stem key 502 from the lower valve stem key 302, enabling the lower valve stem key 302 and the upper valve stem key 502 to be respectively located within each butterfly plate keyway 403 and increasing the range where the lower valve stem key 302 and the upper valve stem key 502 are not in the same butterfly plate keyway 403. This avoids the situation of damaging the butterfly valve 100 due to improper manual operation, reduces the requirement for the operating precision of the upper valve stem 50, thereby reducing the adjustment difficulty of the butterfly valve 100, accelerating the response speed of the adjustment of the butterfly valve 100, and improving the adjustment efficiency of the butterfly valve 100.

[0092] In some embodiments, the upper valve stem 50 includes a plurality of scale marks; the number of scale marks is the same as the number of butterfly plates 40, and the plurality of scale marks correspond one-to-one with the plurality of butterfly plates 40; the plurality of scale marks are spaced along the length direction of the upper valve stem body 501, and the distance between two adjacent scale marks is equal to the height of the butterfly plate 40 along the axis direction of the lower valve stem 30; the scale marks are used to identify the positions where the end face of the first end of the upper valve stem 50 can respectively coincide with the end faces of the respective butterfly plates 40 facing the lower valve stem body 301, so that the end face of the first end of the upper valve stem 50 can be moved to respectively coincide with the end faces of the respective butterfly plates 40 facing the lower valve stem body 301.

[0093] It can be understood that the scale marks can be notches provided on the outer surface of the upper valve stem body 501, or marks coated on the outer surface of the upper valve stem body 501, but are not limited thereto.

[0094] With such a setting, by moving the upper valve stem body 501 and aligning the scale marks with the end face of the valve body 10, the end face of the first end of the upper valve stem 50 can coincide with the end face of the butterfly plate 40 corresponding to the scale mark facing the lower valve stem body 301. Furthermore, the upper valve stem key 502 and the lower valve stem key 302 are not in the same butterfly plate keyway 403 of the same butterfly plate 40, and the rotation of the upper valve stem 50 and the butterfly plate 40 through which the upper valve stem 50 passes will not be interfered by the lower valve stem 30. This reduces the adjustment difficulty of the butterfly valve 100, avoids the situation of damaging the butterfly valve 100 due to improper manual operation, accelerates the response speed of the adjustment of the butterfly valve 100, and improves the adjustment efficiency of the butterfly valve 100.

[0095] In some embodiments, the butterfly valve 100 further includes at least one fluid viewer, and the fluid viewer is provided on the butterfly plate 40. The fluid viewer is used to detect the mixing condition of the fluid and the liquid level height of the fluid.

[0096] It can be understood that the fluid observer is a component used to detect the mixing condition of the liquid and the liquid level height. The butterfly valve 100 may further include a signal processing device and a display. By electrically connecting the fluid observer to the signal processing device and electrically connecting the signal processing device to the display, the fluid information at the input end of the valve body 10 is detected by the fluid observer. The fluid observer sends the signal to the signal processing device, and the signal processing device converts the signal into an image for display on the display. For example, the fluid observer can use an ultrasonic sensor to judge the mixing condition of the liquid and the liquid level height according to the reflection condition of ultrasonic waves, or use an infrared sensor to judge the mixing condition of the liquid and the liquid level height according to the refraction and reflection conditions of infrared rays, but not limited thereto; the signal processing device can use an MCU, a data processing chip, etc., but not limited thereto.

[0097] With such a setting, the mixing condition of the fluid and the liquid level height of the fluid are detected by the fluid observer, and then the upper valve stem 50 is controlled to drive the butterfly plate 40 to rotate according to the mixing condition of the fluid and the liquid level height of the fluid. It can make corresponding adjustments in a timely manner according to the change of the fluid state, is easy to combine with automatic control, improves the adaptability of the butterfly valve 100 to different working conditions, improves the reliability and safety of the butterfly valve 100, and can optimize the fluid flow and improve the regulation efficiency of the butterfly valve 100.

[0098] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A butterfly valve, characterized in that: include: A valve body, wherein the valve body is provided with a fluid passage along its own axial direction; A lower valve stem barrel, one end of which is disposed on the side wall of the valve body, and the axis of the lower valve stem barrel is perpendicular to the axis of the valve body; the lower valve stem barrel is provided with a lower valve stem cavity along its own axis, and the lower valve stem cavity is connected to the fluid channel; A lower valve stem, the lower valve stem being movably disposed in the lower valve stem cavity along a direction perpendicular to the axis of the valve body; a portion of the lower valve stem being capable of moving from the lower valve stem cavity into the fluid passage; A plurality of butterfly plates, wherein the plurality of butterfly plates are detachably arranged on the lower valve stem; The outer arc surfaces of the plurality of butterfly plates can respectively fit with the inner wall of the valve body when the butterfly valve is closed; An upper valve stem, the upper valve stem is arranged opposite to the lower valve stem, the upper valve stem is rotatably inserted into the valve body; the first end of the upper valve stem abuts against the first end of the lower valve stem; the upper valve stem can be respectively inserted into the plurality of butterfly plates, so that the plurality of butterfly plates respectively rotate to different angles following the upper valve stem; as well as A reset device, the reset device is arranged in the lower valve stem cavity, the reset device is used to push the lower valve stem toward the upper valve stem so that the lower valve stem is kept in contact with the upper valve stem and is sequentially penetrated through the plurality of butterfly plates; The lower valve stem is used to limit the rotation of the butterfly plate penetrated by the lower valve stem; the upper valve stem is used to push the first end of the lower valve stem toward the lower valve stem tube, so that the lower valve stem is sequentially separated from at least one of the butterfly plates, and the upper valve stem is sequentially penetrated by at least one of the butterfly plates, and then the upper valve stem drives at least one of the butterfly plates to rotate and makes the plurality of butterfly plates rotate to different angles respectively; The reset device comprises an elastic member, which is arranged in the lower valve stem cavity at one end away from the upper valve stem; one end of the elastic member abuts against the second end of the lower valve stem.

2. The butterfly valve according to claim 1, characterized in that: The plurality of butterfly plates include: Two end butterfly plates, the end butterfly plates are detachably arranged on the lower valve stem, the two end butterfly plates are relatively spaced apart, and one end of the end butterfly plates is attached to the inner wall of the valve body; and The middle butterfly plate is detachably arranged on the lower valve stem; the middle butterfly plate is arranged between the two end butterfly plates, and the two ends of the middle butterfly plate along the axial direction of the lower valve stem are respectively abutted against the other end of the end butterfly plate.

3. The butterfly valve according to claim 2, characterized in that: The end butterfly plate comprises: A first butterfly plate body, wherein the first butterfly plate body is detachably arranged on the lower valve stem in sequence; An arc end portion, the arc end portion is arranged at one end of the first butterfly plate body; the arc end portion is arc-shaped so as to be able to fit against the inner wall of the valve body; a portion of the arc end portion always fits against the inner wall of the valve body; and a first flat end portion, the first flat end portion being disposed at the other end of the first butterfly plate body; The middle butterfly plate comprises: A plurality of second butterfly plate bodies, wherein the plurality of second butterfly plate bodies are sequentially and detachably arranged on the lower valve stem along the axial direction of the lower valve stem; the plurality of second butterfly plate bodies are arranged between the two end butterfly plates; the plurality of second butterfly plate bodies can rotate relative to each other; A plurality of arc side portions, the number of the arc side portions is twice the number of the second butterfly plate bodies; the plurality of arc side portions are respectively arranged on both sides of the plurality of second butterfly plate bodies in a direction perpendicular to the axis of the lower valve stem; the plurality of arc side portions can be respectively fitted to the inner side of the valve body; a plurality of second flat end portions, the number of the second flat end portions being the same as the number of the second butterfly plate bodies; the plurality of second flat end portions being arranged one by one at one end of the plurality of second butterfly plate bodies along the axis of the lower valve stem; and A plurality of third flat ends, the number of the third flat ends being the same as the number of the second butterfly plate bodies; the plurality of third flat ends being arranged one by one at the other end of the plurality of second butterfly plate bodies along the axis of the lower valve stem; Among them, in the second flat end portion and the third flat end portion respectively arranged at both ends of a second butterfly plate body, the end surface area of ​​the second flat end portion is less than or equal to the end surface area of ​​the third flat end portion; the plurality of second butterfly plate bodies are arranged from the end butterfly plate along the axial direction of the lower valve stem from small to large toward the center of the valve body according to the end surface areas of the plurality of second flat end portions or the end surface areas of the plurality of third flat end portions; the second flat end portion of a middle butterfly plate abuts against the first flat end portion of the adjacent end butterfly plate or the third flat end portion of the adjacent middle butterfly plate; the third flat end portion of a middle butterfly plate abuts against the second flat end portion of the adjacent middle butterfly plate or the third flat end portion of the adjacent middle butterfly plate.

4. The butterfly valve according to claim 1, characterized in that: The butterfly plate is provided with a first through hole along the axial direction of the lower valve stem; the inner wall of the first through hole is provided with a plurality of butterfly plate key slots along its circumference, the length direction of the butterfly plate key slots is parallel to the axial direction of the lower valve stem, and the plurality of butterfly plate key slots are spaced apart.

5. The butterfly valve according to claim 4, characterized in that: The inner wall of the lower valve stem tube is provided with a lower valve stem keyway in a direction perpendicular to the axis of the valve body; The lower valve stem comprises: A lower valve stem body, wherein the lower valve stem body is movably disposed in the lower valve stem cavity along a direction perpendicular to the valve body axis; a portion of the lower valve stem body can be moved from the lower valve stem cavity into the fluid channel; A lower valve stem key, wherein the lower valve stem key is arranged on the outer surface of the lower valve stem body along the length direction of the lower valve stem body; the lower valve stem key can be moved into the lower valve stem keyway and the butterfly plate keyway, and the outer side surface of the lower valve stem key can be fitted with the inner side surface of the lower valve stem keyway and the inner side surface of the butterfly plate keyway; and a first stopper, the first stopper being arranged at the second end of the lower valve stem, and the first stopper being used to limit the second end of the lower valve stem from entering the fluid passage; Wherein, the lower valve stem is used to prevent the butterfly plate from rotating and keep it at a fixed angle when the lower valve stem key moves into the butterfly plate keyway.

6. The butterfly valve according to claim 5, characterized in that: The upper valve stem comprises: An upper valve stem body, the upper valve stem body is arranged opposite to the lower valve stem, and the upper valve stem body is rotatably inserted into the valve body; An upper valve stem key, the upper valve stem key being arranged on the outer surface of the upper valve stem body along the length direction of the upper valve stem body; the upper valve stem key being movable into the butterfly plate keyway, and the outer side surface of the upper valve stem key being able to fit with the inner side surface of the butterfly plate keyway; and A second limiting member is provided at the second end of the upper valve stem body, and is used for limiting the second end of the upper valve stem body from entering the fluid channel and limiting the first end of the upper valve stem body from entering the lower valve stem cavity.

7. The butterfly valve according to claim 6, characterized in that: The butterfly valve further comprises a ratchet valve cover, which is arranged on a side of the valve body away from the lower valve stem tube, and the ratchet valve cover is provided with a second through hole, and a valve cover key groove is provided on the inner wall of the second through hole along the axial direction of the lower valve stem; Wherein, the inner side surface of the valve cover keyway can fit with the outer side surface of the upper valve stem key; and the ratchet valve cover is used to rotate the upper valve stem at a fixed angle.

8. The butterfly valve according to claim 6, characterized in that: The upper valve stem further comprises an abutting portion, one end of which is arranged at one end of the upper valve stem body facing the lower valve stem, and the other end of which abuts against the first end of the lower valve stem; the diameter of the abutting portion is smaller than that of the upper valve stem body; the distance of the end surface of the abutting portion protruding from the first end of the upper valve stem is smaller than the height of the butterfly plate along the axial direction of the lower valve stem; Wherein, the abutment portion is used to ensure that the lower valve stem key and the upper valve stem key are not in the same butterfly plate keyway.

9. The butterfly valve according to claim 6, characterized in that: The upper valve stem includes a plurality of scale marks; the number of the scale marks is the same as the number of the butterfly plates, and the plurality of scale marks correspond one-to-one to the plurality of butterfly plates; the plurality of scale marks are spaced apart along the length direction of the upper valve stem body, and the spacing between two adjacent scale marks is equal to the height of the butterfly plate along the axial direction of the lower valve stem; the scale marks are used to mark the position at which the end face of the first end of the upper valve stem can respectively coincide with the end face of each of the butterfly plates facing one end of the lower valve stem body, so that the end face of the first end of the upper valve stem can be moved to coincide with the end face of each of the butterfly plates facing one end of the lower valve stem body.

10. The butterfly valve according to claim 1, characterized in that: The butterfly valve further comprises at least one fluid observer, which is arranged on the butterfly plate and is used to detect the mixing condition of the fluid and the liquid level of the fluid.

Images