Butterfly valve

Abstract

The invention relates to the technical field of butterfly valves, and provides a butterfly valve which comprises a valve body, a lower valve rod barrel, a lower valve rod, a plurality of butterfly plates and an upper valve rod, and one end, perpendicular to the axis of the valve body, of the lower valve rod barrel is arranged on the side wall of the valve body; a lower valve rod cavity is formed in the lower valve rod barrel in the axis direction of the lower valve rod barrel and communicates with the fluid channel. The lower valve rod is movably arranged in the lower valve rod cavity in the direction perpendicular to the axis of the valve body. The plurality of butterfly plates are detachably arranged on the lower valve rod; an upper valve rod which is arranged opposite to the lower valve rod and abuts against the lower valve rod is rotatably arranged in the valve body in a penetrating manner; the upper valve rod is used for pushing the first end of the lower valve rod towards the lower valve rod cylinder so that the lower valve rod can be sequentially separated from the butterfly plates, the upper valve rod sequentially penetrates through at least one butterfly plate, and then the upper valve rod drives the butterfly plates to rotate. According to the butterfly valve, layered fluid can sequentially pass through the butterfly valve according to the layering depth, or the layered fluid can be fully mixed, and the adjusting precision of opening and closing of the butterfly valve is improved.

Description

Technical Field

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

[0002] A butterfly valve is a valve that controls the valve disc to rotate around the valve shaft to cut off and throttle the fluid in the pipeline system.

[0003] The butterfly valve in the related art can only cut off or allow all fluids in the pipeline to flow by controlling the valve plate. However, some pipelines contain multiple fluids and need to be stratified or mixed. In this case, it may be necessary to discharge the fluid and then separate or mix it in layers. However, the butterfly valve cannot discharge the mixed fluid in layers, nor can it mix the stratified fluids and then discharge them. Summary of the invention

[0004] The embodiment of the present 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 the pipeline.

[0005] The present application provides a butterfly valve, comprising: 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 a plurality of the butterfly plates, so that the plurality of butterfly plates respectively rotate to different angles following the upper valve stem; and a reset device, the reset device being disposed in the lower valve stem cavity, the reset device being used to push the lower valve stem toward the upper valve stem so that the lower valve stem remains in contact with the upper valve stem; Among them, 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 inserted into 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 multiple butterfly plates rotate to different angles respectively.

[0006] The above technical solutions in the embodiments of the present application have at least the following technical effects: The butterfly valve provided in the embodiment of the present application is provided with a lower valve stem cylinder on the outer side wall of the valve body, a lower valve stem cavity connected with the fluid channel of the valve body is opened in the lower valve stem cylinder, a lower valve stem capable of moving into the fluid channel along the axial direction of the lower valve stem cylinder is provided in the lower valve stem cavity, a plurality of butterfly plates are detachably provided on the lower valve stem, an upper valve stem is rotatably penetrated in the valve body and arranged opposite to 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 is respectively penetrated by the plurality of butterfly plates, and the upper valve stem is respectively penetrated by different butterfly plates to rotate the plurality of butterfly plates to different angles, so that the stratified fluid can pass through in sequence according to the stratification depth, or the stratified fluid can form vortex when flowing through the butterfly valve through the plurality of butterfly plates at different angles, thereby achieving mixing, so that 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.

[0007] In some embodiments, 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.

[0008] In some embodiments, 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.

[0009] In some embodiments, 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 grooves along its circumference, the length direction of the butterfly plate key groove is parallel to the axial direction of the lower valve stem, and the plurality of butterfly plate key grooves are spaced apart.

[0010] In some embodiments, 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 limiting member, the first limiting member being arranged at the second end of the lower valve stem body, and the first limiting member being used for limiting the second end of the lower valve stem body 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.

[0011] In some embodiments, 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.

[0012] In some embodiments, the butterfly valve further comprises a ratchet valve cover, the ratchet valve cover is arranged on a side of the valve body away from the lower valve stem tube, 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.

[0013] In some embodiments, the upper valve stem further comprises an abutment 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 the abutment portion abuts against the first end of the lower valve stem; the diameter of the abutment portion is smaller than that of the upper valve stem body; the distance of the end surface of the abutment 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.

[0014] 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 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.

[0015] In some embodiments, the butterfly valve further includes at least one fluid observer, which is disposed on the butterfly plate and is used to detect the mixing condition of the fluid and the liquid level of the fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 A schematic diagram of the structure of a butterfly valve provided in an embodiment of the present application; Figure 2 A schematic diagram of the structure of a valve body of a butterfly valve provided in an embodiment of the present application; Figure 3 A schematic diagram of the structure of the end butterfly plate provided in the embodiment of the present application; Figure 4 A schematic diagram of the structure of the middle butterfly plate provided in an embodiment of the present application; Figure 5 A schematic diagram of the structure in which the lower valve stem provided in the embodiment of the present application is inserted through a portion of the butterfly plate; Figure 6 A schematic diagram of the structure in which the upper valve stem provided in an embodiment of the present application is inserted through a portion of the butterfly plate.

[0018] Among them, the reference numerals in the figure are: 100, butterfly valve; 10, valve body; 101, fluid channel; 20, lower valve stem barrel; 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 stopper; 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 limiter; 504, abutment; 60, ratchet valve cover; 601, second through hole; 602, valve cover keyway. DETAILED DESCRIPTION

[0019] 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.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art 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-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] In this application, "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships; for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0025] It should be noted that, in the present application, words such as "in some embodiments", "exemplarily", "for example", etc. are used to indicate examples, illustrations or descriptions. Any embodiment or design described in the present application as "in some embodiments", "exemplarily", "for example" should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "in some embodiments", "exemplarily", "for example", etc. is intended to present related concepts in a concrete way, meaning that specific features, structures or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the above words in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0026] A butterfly valve is a valve that controls the valve disc to rotate around the valve shaft to cut off and throttle the fluid in the pipeline system.

[0027] The butterfly valve in the related art can only cut off or allow all fluids in the pipeline to flow by controlling the valve plate. However, some pipelines contain multiple fluids and need to be stratified or mixed. In this case, it may be necessary to discharge the fluid and then separate or mix it in layers. However, the butterfly valve cannot discharge the mixed fluid in layers, nor can it mix the stratified fluids and then discharge them.

[0028] Based on this, in order to improve the problem that the butterfly valve in the related art cannot separate or mix multiple fluids in the pipeline, the embodiment of the present application provides the following solution.

[0029] Please also read Figures 1 to 6The embodiment of the present application provides a butterfly valve 100, which includes a valve body 10, a lower valve stem barrel 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 channel 101 along its own axial direction. One end of the lower valve stem barrel 20 is arranged on the side wall of the valve body 10, and the axis of the lower valve stem barrel 20 is perpendicular to the axis of the valve body 10. The lower valve stem barrel 20 is provided with a lower valve stem cavity 201 along its own axial direction, and the lower valve stem cavity 201 is connected to the fluid channel 101. The lower valve stem 30 is movably arranged in the lower valve stem cavity 201 in a direction perpendicular to the axis of the valve body 10; a part of the lower valve stem 30 can be moved from the lower valve stem cavity 201 to the fluid channel 101. A 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 respectively fit with 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 inserted into 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 be inserted into a plurality of butterfly plates 40 respectively, 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 toward 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 toward the lower valve stem tube 20, so that the lower valve stem 30 is sequentially separated from at least one butterfly plate 40, and the upper valve stem 50 is sequentially inserted into at least one butterfly plate 40, and then the upper valve stem 50 drives at least one butterfly plate 40 to rotate and the plurality of butterfly plates 40 are respectively rotated to different angles.

[0030] It can be understood that the valve body 10 is a component used to connect pipelines and provide a mounting base 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 channel 101 in the axial direction of the valve body 10 is circular. The plurality of butterfly plates 40 can be respectively fitted with the inner wall of the valve body 10 so that the fluid cannot pass through the fluid channel 101.

[0031] The upper valve stem 50 is a component used to push the first end of the lower valve stem 30 into the lower valve stem tube 20 and rotate the butterfly plate 40. A through hole can be opened on the valve body 10, and the upper valve stem 50 is inserted into 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 set on the valve body 10, and the upper valve stem 50 is inserted into 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 the present invention is not limited to this.

[0032] The reset device is a component used to push the lower valve stem 30 toward 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, and 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 a natural state without pressure, the first end of the lower valve stem 30 is in contact with the side of the inner wall of the valve body 10 away from the lower valve stem tube 20, and the second end of the lower valve stem 30 is in contact with one end of the elastic member; or the reset device can be a magnet, and 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 are opposite, so that the lower valve stem 30 always receives a repulsive force toward the upper valve stem 50, but is not limited to this.

[0033] As can be seen from the above, the butterfly valve 100 provided in the embodiment of the present application is provided with a lower valve stem barrel 20 on the outer wall of the valve body 10, a lower valve stem chamber 201 connected to the fluid channel 101 of the valve body 10 is opened in the lower valve stem barrel 20, a lower valve stem 30 that can move along the axial direction of the lower valve stem barrel 20 to the fluid channel 101 is provided in the lower valve stem chamber 201, a plurality of butterfly plates 40 are detachably provided on the lower valve stem 30, an upper valve stem 50 is rotatably provided in the valve body 10 and is arranged opposite to the lower valve stem 30, and the upper valve stem 50 can move the lower valve stem 30 The first end is pushed into the lower valve stem cavity 201 and is respectively penetrated by multiple butterfly plates 40. The upper valve stem 50 is respectively penetrated by different butterfly plates 40 to allow the multiple butterfly plates 40 to rotate to different angles, so that the stratified fluid can pass through in sequence according to the stratification depth, or the stratified fluid can form vortices when flowing through the butterfly valve 100 through multiple 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.

[0034] 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 relatively spaced apart. One end of the end butterfly plates 401 is attached to 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. Both ends of the middle butterfly plate 404 along the axial direction of the lower valve stem 30 are respectively abutted against the other end of the end butterfly plates 401.

[0035] It can be understood that the butterfly plate 40 is in contact with other adjacent butterfly plates 40, and the shape formed by the plurality of butterfly plates 40 is the same as the projection shape of the fluid channel 101 in the axial direction of the valve body 10 itself, so that the plurality of butterfly plates 40 can close the fluid channel 101. The end butterfly plate 401 is a butterfly plate 40 located at both ends of the plurality of butterfly plates 40 along the axial direction of the lower valve stem 30, and the middle butterfly plate 404 is a butterfly plate 40 between the two end butterfly plates 401.

[0036] In this way, by detachably arranging the two end butterfly plates 401 and a middle butterfly plate 404 on the lower valve stem 30 along the axial direction of the lower valve stem 30, the regulation accuracy of the opening and closing of the butterfly valve 100 on the passing flow rate can be improved, and by independently adjusting the position of each butterfly plate 40, the sealing surfaces of each butterfly plate 40 can be better matched, thereby improving the sealing performance of the butterfly valve 100, and further improving the reliability and durability of the butterfly valve 100, and repairing according to the specific damaged parts can reduce the difficulty and cost of repairing the butterfly valve 100.

[0037] Optionally, in some embodiments, see 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.

[0038] The middle butterfly plate 404 includes a plurality of second butterfly plate bodies 4041, a plurality of arc 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 detachably arranged on the lower valve stem 30 in sequence 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 arc side portions 4042 is twice the number of the second butterfly plate bodies 4041; the plurality of arc side portions 4042 are respectively arranged on both sides of the plurality of second butterfly plate bodies 4041 along a direction perpendicular to the axis of the lower valve stem 30; the plurality of arc side portions 4042 can be respectively attached to the inner side of the valve body 10; the plurality of second flat end portions 4043 are arranged one by one at one end of the plurality of second butterfly plate bodies 4041 along the axis of the lower valve stem 30; the plurality of third flat end portions 4044 are respectively arranged one by one along the axis of the lower valve stem 30 The second butterfly plate bodies 4041 are arranged at the other end of the plurality of second butterfly plate bodies 4041; wherein, in 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 surface area of ​​the second flat end portion 4043 is less than or equal to the end surface 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 toward the center of the valve body 10 according to the end surface areas of the plurality of second flat end portions 4043 or the end surface areas 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.

[0039] It can be understood that the first butterfly plate body 4011 is the main structure of the end butterfly plate 401, which is used to carry the arc end 4012. The material of the first butterfly plate body 4011 can be stainless steel or plastic, but is not limited thereto. The arc end 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 4012 is arc-shaped and can be an arc-shaped surface so as to fit the arc-shaped inner wall of the valve body 10. The first flat end 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 flat surface. The plurality of second butterfly plate bodies 4041 are the main structure of the middle butterfly plate 404, which are used to carry two arc side parts 4042, a second flat end 4043 and a third flat end 4044. The material of the second butterfly plate body 4041 can be the same material as the first butterfly plate body 4011. The two arc side portions 4042 are respectively arranged at the two ends of the second butterfly plate body 4041 along the direction perpendicular to the axis of the lower valve stem 30, and the arc side portions 4042 may be arc-shaped surfaces, which are used to fit the inner side of the valve body 10 when closing the butterfly valve 100. The second flat end portion 4043 and the third flat end portion 4044 are respectively arranged at the two ends of the second butterfly plate body 4041 along the direction of the axis of the lower valve stem 30, and both the second flat end portion 4043 and the third flat end portion 4044 may be flat surfaces.

[0040] Optionally, see 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.

[0041] In this way, the multiple 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 toward the center of the valve body 10 according to the end surface area of ​​the multiple second flat end portions 4043 or the end surface area of ​​the multiple 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 are respectively abutted against the first flat end portions 4013 of the two end butterfly plates 401. Each first butterfly plate body 4011 and the second butterfly plate body 4041 can be rotated to the same or different angles, which can improve the valve body 10's ability to regulate the passing fluid, optimize the fluid transmission efficiency, reduce energy loss, improve heat exchange efficiency, and reduce friction between different layers of the fluid, thereby reducing corrosion and wear of pipelines and equipment, and improving the safety and reliability of the butterfly valve 100.

[0042] In some embodiments, see Figure 3 and Figure 4 The butterfly plate 40 is provided with a first through hole 402 along the axial direction of the lower valve stem 30; the inner wall of the first through hole 402 is provided with a plurality of butterfly plate key grooves 403 along its circumference, the length direction of the butterfly plate key grooves 403 is parallel to the axial direction of the lower valve stem 30, and the plurality of butterfly plate key grooves 403 are spaced apart.

[0043] It can be understood that the inner wall of the first through hole 402 is in contact with 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 keyway 403 is the same as the height of the butterfly plate 40.

[0044] In this way, by opening a first through hole 402 on the butterfly plate 40 along the axial direction of the lower valve stem 30 and opening a plurality of butterfly plate key grooves 403 along the circumference of the inner wall of the first through hole 402 with a length direction parallel to the axial direction of the lower valve stem 30, and the plurality of butterfly plate key grooves 403 are spaced apart, the butterfly plate can be fixed at the same or different angles through the plurality of butterfly plate key grooves 403, which can improve the sealing effect of the butterfly valve 100, improve the positioning strength of each butterfly plate 40, improve the accuracy of the operation, reduce the friction between the butterfly plate 40 and the valve seat, and extend the service life of the butterfly valve 100.

[0045] In some embodiments, see Figure 1 , Figure 2 and Figure 5 The inner wall of the lower valve stem barrel 20 is provided with a lower valve stem keyway 202 along a direction perpendicular to the axis of the valve body 10; the lower valve stem 30 comprises a lower valve stem body 301, a lower valve stem key 302 and a first stopper 303; the lower valve stem body 301 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 body 301 can be moved from the lower valve stem cavity 201 to the fluid channel 101; the lower valve stem key 302 is arranged 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 The rod key 302 can move into the lower valve stem keyway 202 and the butterfly plate keyway 403, and the outer side surface of the lower valve stem key 302 can fit with the inner side surface of the lower valve stem keyway 202 and the inner side surface of the butterfly plate keyway 403; the first limit member 303 is arranged at the second end of the lower valve stem body 301, and the first limit member 303 is used to limit the second end of the lower valve stem body 301 from entering the fluid channel 101; wherein, the lower valve stem 30 is used to prevent the butterfly plate 40 from rotating and being at a fixed angle when the lower valve stem key 302 moves into the butterfly plate keyway 403.

[0046] 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 of the lower valve stem tube 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 length of the inner diameter 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 making the butterfly plate 40 passed through by the lower valve stem 30 unable to rotate. 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 that matches the lower valve stem key 302, so that the outer side of the lower valve stem key 302 can fit the inner side of the lower valve stem keyway 202 and the inner side of the butterfly plate keyway 403. The first limit member 303 is a component used to prevent the second end of the lower valve stem body 301 from entering the fluid channel 101. For example, the first limit member 303 can be a limit block with a spring at one end. A recessed hole can be provided at one end of the lower valve stem cavity 201 close to the fluid channel 101 to connect the spring of the first limit member 303 to the second end of the lower valve stem body 301. The spring can be extended and retracted in a direction perpendicular to the axis of the lower valve stem body 301. The limit block abuts against the inner wall of the lower valve stem tube 20 under the push of the spring. When the second end of the lower valve stem body 301 moves to the lower valve stem cavity 201 close to the fluid channel 101, the limit block 303 can be opened. When approaching one end of the circulation channel, the spring can push the limit block into the recessed hole, so that the second end of the lower valve stem body 301 cannot enter the fluid channel 101; or the first limit member 303 can be a magnet, and the first limit member 303 is set at the second end of the lower valve stem body 301, and another magnet is set at one end of the lower valve stem cavity 201 close to the fluid channel 101. When the second end of the lower valve stem body 301 moves to the end of the lower valve stem cavity 201 close to the circulation channel, the two magnets can attract each other, so that the second end of the lower valve stem body 301 cannot enter the fluid channel 101, but is not limited to this.

[0047] In this way, by opening a first through hole 402 and a butterfly plate keyway 403 on the butterfly plate 40, opening a lower valve stem keyway 202 on the inner wall of the lower valve stem tube 20, and setting a lower valve stem key 302 on the outer surface of the lower valve stem body 301, and setting the first limit member 303 at the second end of the lower valve stem body 301, the lower valve stem key 302 enters the butterfly plate keyway 403 through the movement of the lower valve stem body 301, so that the butterfly plate 40 cannot rotate but is at a fixed angle, which can improve the sealing effect of the butterfly valve 100, prevent fluid leakage, ensure safe use, 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.

[0048] Optionally, in some embodiments, see Figure 1 and Figure 6The upper valve stem 50 includes an upper valve stem body 501, an upper valve stem key 502 and a second limit member 503. The upper valve stem body 501 is arranged opposite to the lower valve stem 30, and the upper valve stem body 501 is rotatably penetrated in the valve body 10; the upper valve stem key 502 is arranged 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 be moved into the butterfly plate key groove 403, and the outer side surface of the upper valve stem key 502 can fit with the inner side surface of the butterfly plate key groove 403; the second limit member 503 is arranged at the second end of the upper valve stem body 501, and the second limit member 503 is used to limit the second end of the upper valve stem body 501 from entering the fluid channel 101 and limit the first end of the upper valve stem body 501 from entering the lower valve stem cavity 201.

[0049] It can be understood that the upper valve stem body 501 is a component used to push the lower valve stem body 301 into the lower valve stem tube 20 and is sequentially inserted into each butterfly plate 40. For example, the upper valve stem body 501 can adopt a cylindrical structure, and the outer side of the upper valve stem body 501 directly slides with the inner side of the first through hole 402 of the butterfly plate 40; or the upper valve stem body 501 can adopt a rectangular parallelepiped structure, a square hole bearing is provided on the valve body 10, and the upper valve stem body 501 is inserted into the square hole bearing, and then inserted into each butterfly plate 40 one by one, but it is not limited thereto. The length of the upper valve stem body 501 is equal to the length of the inner diameter of the valve body 10. The upper valve stem key 502 is a component for transmitting the torque of the upper valve stem body 501 to rotate. 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 into any butterfly plate key slot 403 of the butterfly valve 100, so that the butterfly plate 40 only penetrated by the upper valve stem body 501 can rotate with the upper valve stem body 501. The second stopper 503 can adopt the same structure as the first stopper 303 to limit the second end of the upper valve stem body 501 from entering the fluid channel 101.

[0050] In this way, by setting an 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 face of the first end of the upper valve stem body 501 coincides with the end face of the butterfly plate 40 closest to the lower valve stem tube 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 grooves 403, and the upper valve stem key 502 can enter any butterfly plate key groove 403 of the butterfly plate 40, so that different butterfly plates 40 are at different angles, which can achieve 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 on the fluid.

[0051] Optionally, see Figure 1 and Figure 2The butterfly valve 100 also includes a ratchet valve cover 60, which is arranged on a side of the valve body 10 away from the lower valve stem tube 20. The ratchet valve cover 60 is provided with a second through hole 601, and a valve cover key groove 602 is provided on the inner wall of the second through hole 601 along the axial direction of the lower valve stem 30; wherein the inner side surface of the valve cover key groove 602 can fit with 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.

[0052] It can be understood that the ratchet valve cover 60 is a component used to rotate the upper valve stem 50 at a preset fixed angle, and the number of the preset fixed angles is the same as the number of the butterfly plate key slots 403, so that the upper valve stem body 501 can rotate to any angle, and the upper valve stem key 502 slot can enter the butterfly plate key slot 403. The axis of the ratchet is collinear with the axis of the lower valve stem barrel 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 key slot 202 is used to cooperate with the upper valve stem key 502, so that the upper valve stem body 501 can be inserted into the second through hole 601.

[0053] In this way, by setting a ratchet valve cover 60 on the valve body 10, the upper valve stem 50 can be rotated at a preset fixed angle, and when the upper valve stem body 501 is rotated to any angle, the upper valve stem key 502 groove can enter the butterfly plate key groove 403, which simplifies the operation difficulty of the butterfly valve 100, improves the operation efficiency of the regulating butterfly valve 100, improves the regulation accuracy of the butterfly valve 100, and speeds up the response speed of the butterfly valve 100 regulation, so that the butterfly valve 100 can cope with different working conditions, and improves the adaptability and safety of the butterfly valve 100.

[0054] In some embodiments, see Figure 1 and Figure 6 The upper valve stem 50 also includes a butt joint 504, one end of which is arranged at one end of the upper valve stem body 501 facing the lower valve stem 30, and the other end of the butt joint 504 is butted against the first end of the lower valve stem 30; the diameter of the butt joint 504 is smaller than the upper valve stem body 501; the distance of the end surface of the butt joint 504 protruding from the first end of the upper valve stem 50 is smaller than the height of the butterfly plate 40 along the axial direction of the lower valve stem 30; wherein, the butt joint 504 is used to make the lower valve stem key 302 and the upper valve stem key 502 not in the same butterfly plate key slot 403.

[0055] It can be understood that the abutment portion 504 is a component used to ensure that the lower valve stem key 302 and the upper valve stem key 502 are not in the same butterfly plate keyway 403. The abutment portion 504 can adopt a structure whose projection along the axial direction of the upper valve stem 50 is the same as the projection of the upper valve stem body 501, or it can adopt a cylinder with a diameter smaller than the upper valve stem 50, but is not limited to this.

[0056] In this way, by setting an abutment portion 504 at one end of the upper valve stem body 501 facing the lower valve stem 30, the abutment portion 504 separates the upper valve stem key 502 from the lower valve stem key 302, so that the lower valve stem key 302 and the upper valve stem key 502 can be respectively located in each butterfly plate key groove 403 and the range in which the lower valve stem key 302 and the upper valve stem key 502 are not in the same butterfly plate key groove 403 is increased, thereby avoiding damage to the butterfly valve 100 due to improper manual operation, reducing the operating accuracy requirements of the upper valve stem 50, and thereby reducing the difficulty of adjusting the butterfly valve 100, accelerating the response speed of the butterfly valve 100 adjustment, and improving the efficiency of the butterfly valve 100 adjustment.

[0057] In some embodiments, the upper valve stem 50 includes multiple scale marks; the number of scale marks is the same as the number of butterfly plates 40, and the multiple scale marks correspond one-to-one to the multiple butterfly plates 40; the multiple scale marks are arranged at intervals along the length direction of the upper valve stem body 501, and the spacing between two adjacent scale marks is equal to the height of the butterfly plate 40 along the axial direction of the lower valve stem 30; the scale marks are used to indicate the position at which the end face of the first end of the upper valve stem 50 can respectively coincide with the end face of each butterfly plate 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 coincide with the end face of each butterfly plate 40 facing the lower valve stem body 301.

[0058] It can be understood that the scale mark can be a notch provided on the outer surface of the upper valve stem body 501, or a mark coated on the outer surface of the upper valve stem body 501, but it is not limited thereto.

[0059] In this way, by moving the scale mark to align with the end face of the valve body 10 when moving the upper valve stem body 501, the end face of the first end of the upper valve stem 50 can be made to coincide with the end face of the butterfly plate 40 corresponding to the scale mark and facing the lower valve stem body 301, thereby making the upper valve stem key 502 and the lower valve stem key 302 not in the butterfly plate keyway 403 of the same butterfly plate 40, and the rotation of the upper valve stem 50 and the butterfly plate 40 penetrated by the upper valve stem 50 will not be interfered with by the lower valve stem 30, thereby reducing the difficulty of adjusting the butterfly valve 100, avoiding the situation where the butterfly valve 100 is damaged due to improper manual operation, accelerating the response speed of the butterfly valve 100, and improving the efficiency of the butterfly valve 100.

[0060] In some embodiments, the butterfly valve 100 further includes at least one fluid observer, which is disposed on the butterfly plate 40 and is used to detect the mixing condition of the fluid and the liquid level of the fluid.

[0061] It can be understood that the fluid observer is a component for detecting the mixing condition and liquid level of the liquid. The butterfly valve 100 can also 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 and displays it on the display. For example, the fluid observer can use an ultrasonic sensor to determine the mixing condition and liquid level of the liquid based on the reflection of the ultrasonic wave, or use an infrared sensor to determine the mixing condition and liquid level of the liquid based on the refraction and reflection of the infrared light, but it is not limited to this; the signal processing device can use an MCU, a data processing chip, etc., but it is not limited to this.

[0062] With such an arrangement, the mixing condition of the fluid and the liquid level of the fluid are detected by a 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. Corresponding adjustments can be made in time according to changes in the fluid state, and it is easy to combine with automatic control, thereby improving the adaptability of the butterfly valve 100 to different working conditions, improving the reliability and safety of the butterfly valve 100, and being able to optimize fluid flow and improve the control efficiency of the butterfly valve 100.

[0063] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should 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 being disposed in the lower valve stem cavity, the reset device being used to push the lower valve stem toward the upper valve stem so that the lower valve stem remains in contact with the upper valve stem; Among them, 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 inserted into 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 multiple butterfly plates rotate to different angles respectively.

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 cylinder 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 limiting member, the first limiting member being arranged at the second end of the lower valve stem body, and the first limiting member being used for limiting the second end of the lower valve stem body 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.

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