Double butterfly plate type connecting pipe regulating valve

Abstract

The application provides a double butterfly plate type communication pipe regulating valve, and relates to the technical field of valves.The valve seat is internally formed with a medium passage, the medium passage is internally provided with a rotatable first butterfly plate, the first butterfly plate can open or close the medium passage when rotating, a middle through hole is formed in the first butterfly plate, the middle through hole is internally provided with a rotatable second butterfly plate, and the second butterfly plate can open or close the middle through hole when rotating;the rotating shafts of the first butterfly plate and the second butterfly plate are coincident with a preset axis, and a torsion piece is arranged between the rotating shafts;when the medium passage needs to be opened, the second butterfly plate is first rotated to gradually open the middle through hole, so that the torsion piece is twisted and stores torsion force; because the release direction of the torsion force is the same as the rotating direction of the first butterfly plate when the medium passage is opened, the torsion force can assist the first butterfly plate to rotate and open the medium passage when the first butterfly plate rotates, so that the opening of the regulating valve is more labor-saving.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a double-butterfly plate type connecting pipe regulating valve. Background Technology

[0002] Valves are key mechanical devices in fluid pipeline systems used to control the flow rate, direction, pressure, and temperature of media. They can be classified by structure into gate valves, globe valves, ball valves, butterfly valves, etc. Among them, the butterfly valve's opening and closing element is a disc-shaped butterfly plate that rotates around the valve shaft to achieve pipeline opening, closing, and regulation. Butterfly valves are characterized by simple structure, small size, light weight, rapid opening and closing, and low flow resistance, making them particularly suitable for large-diameter pipelines. Butterfly valves are further classified by structural design into centerline / double eccentric / triple eccentric types. The triple eccentric butterfly valve adds an angular eccentricity to the double eccentric structure. Specifically, there is an offset between the valve stem axis and the butterfly plate sealing surface, and an offset from the valve body passage axis. Simultaneously, the valve seat rotation axis forms an eccentric angle with the valve body passage axis. During opening and closing, the butterfly plate sealing surface and the valve seat sealing surface quickly disengage at the moment of opening and only contact and press together at the moment of closing, thus achieving frictionless operation between the sealing surfaces, effectively avoiding scratches and wear, and extending service life. In addition, triple eccentric butterfly valves often employ a multi-layered metal sealing structure, such as a valve seat made of stainless steel sheets and graphite, which combines the strength of a hard metal seal with the adaptability of an elastic seal, enabling them to achieve reliable sealing under harsh conditions such as high temperature and high pressure. They are widely used in important pipeline systems in industries such as petroleum, chemical, power, and metallurgy.

[0003] Under high pressure conditions, the sealing surface of the butterfly plate of the existing triple eccentric butterfly valve is tightly fitted to the valve seat. When opening, the torque required to overcome the initial static friction and medium pressure is large, which makes it more difficult to open the valve.

[0004] The information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] Therefore, it is necessary to provide a double-butterfly plate connecting pipe regulating valve to address the problems existing in the current triple-eccentric butterfly valve.

[0006] The above objectives are achieved through the following technical solutions: A double-butterfly plate type connecting pipe regulating valve includes a valve seat with a medium passage inside. A first butterfly plate, which can rotate, is provided in the medium passage. When the first butterfly plate rotates, it can open or close the medium passage. A through hole is formed through the first butterfly plate, and a second butterfly plate, which can rotate, can open or close the through hole. The valve seat is provided with a first driving member for rotating the first butterfly plate and a second driving member for rotating the second butterfly plate. The rotation axes of the first butterfly plate and the second butterfly plate are both coincident with a preset axis, and a torsion member is provided between them. When it is necessary to open the medium passage, the second butterfly plate rotates first to gradually open the through hole, so that the torsion member is torsionally twisted and stores torsion force. The direction of release of the torsion force is the same as the direction of rotation when the first butterfly plate opens the medium passage, so as to assist the rotation of the first butterfly plate to open the medium passage.

[0007] Furthermore, the torsion member includes an active section and a free section along the preset axis. The two ends of the active section are connected to the rotating shaft of the first butterfly plate and the rotating shaft of the second butterfly plate, respectively. When the second butterfly plate rotates, the active section is torsionally twisted and stores torsional force, while the free section remains unchanged. An adjustment part is provided on the second rotating shaft. When the pressure value of the medium is less than or equal to the preset value, the adjustment part keeps the lengths of the active section and the free section unchanged. When the pressure value of the medium is greater than the preset value, the adjustment part reduces the length of the active section and increases the length of the free section.

[0008] Furthermore, the adjustment unit includes a movable member and multiple connecting members. The movable member and the rotating shaft of the second butterfly plate can slide relative to each other in the axial direction of a preset axis, while being relatively fixed in the circumferential direction of the preset axis. The torsion member includes multiple torsion springs evenly distributed along the axial direction of the preset axis. The torsion springs and connecting members are alternately arranged and sequentially connected along the preset axis. The connecting members have a first state and a second state. In the first state, the connecting member and the movable member are relatively fixed in the circumferential direction of the preset axis. In the second state, the connecting member and the movable member can rotate relative to each other in the circumferential direction of the preset axis. When the second butterfly plate rotates, only one connecting member is in the first state, and the other connecting members are in the second state. When the pressure value of the medium is less than or equal to the preset value, one of the connecting members remains in the first state, so that the lengths of the working section and the free section remain unchanged. When the pressure value of the medium is greater than the preset value, the medium pushes the movable member to move axially along the preset axis, and the connecting member closer to the rotating shaft of the first butterfly plate switches to the first state, so that the length of the working section decreases and the length of the free section increases.

[0009] Furthermore, the first butterfly plate has a accommodating cavity formed inward from its end on the rotating shaft, and the second butterfly plate has a rotating shaft extending into the accommodating cavity. The moving member divides the accommodating cavity into a first chamber and a second chamber on the preset axis. The first chamber is connected to the medium passage. The second chamber is provided with a bellows, which is sleeved on the outside of the torsion member and connected between the moving member and the rotating shaft of the first butterfly plate.

[0010] Furthermore, the movable component is annular and has a slot. The connecting component includes a ring body and a locking pin. The torsion spring and the ring body are alternately arranged and connected in sequence along a preset axis. When the movable component moves axially along the preset axis, the locking pin can engage with or disengage from the slot. When the locking pin engages with the slot, the ring body and the movable component are relatively fixed in the circumferential direction of the preset axis. When the locking pin disengages from the slot, the ring body and the movable component can rotate relative to each other in the circumferential direction of the preset axis.

[0011] Furthermore, an elastic element is provided between the pin and the ring body. The elastic element is used to make the pin tend to engage with the slot. The pin and the slot have a guide structure. When the pin engages with the slot and the moving part moves axially along the preset axis, the guide structure makes the pin overcome the elastic force of the elastic element and disengage from the slot.

[0012] Furthermore, at least two slots are evenly distributed circumferentially along a preset axis, and the connector includes at least two locking pins, with each locking pin corresponding to one of the at least two slots.

[0013] Furthermore, the movable component extends into the first chamber and forms a guide tube, the axis of which coincides with a preset axis, and the guide tube is used to accommodate the free segment.

[0014] Furthermore, the rotating shaft of the first butterfly plate is rotatably connected to the rotating shaft of the second butterfly plate.

[0015] Furthermore, flange structures for connecting pipelines are provided on both sides of the valve seat.

[0016] The present invention has at least the following beneficial effects: When it is necessary to open the medium passage, the second butterfly plate rotates first to gradually open the central through hole, so that the torsion element is twisted and stores torsional force. Since the release direction of the torsional force is the same as the direction of the first butterfly plate when opening the medium passage, the torsional force can assist the first butterfly plate in opening the medium passage when it rotates, making it easier to open the regulating valve. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a double-butterfly plate type connecting pipe regulating valve provided in an embodiment of the present invention; Figure 2 for Figure 1 The front view; Figure 3 for Figure 2 Sectional view along axis AA; Figure 4 for Figure 2 BB-direction sectional view; Figure 5 for Figure 4 A magnified view of a section at point C; Figure 6 for Figure 5A magnified view of a section at point D; Figure 7 for Figure 1 Exploded view of the internal structure of the valve seat; Figure 8 This is a schematic diagram of the torsion component.

[0018] in: 101. Valve seat; 102. Medium passage; 103. First butterfly plate; 104. Central through hole; 105. Second butterfly plate; 106. First driving component; 107. Second driving component; 108. Torsion component; 109. First rotating shaft; 110. Second rotating shaft; 111. Moving component; 112. Connecting component; 113. Torsion spring; 114. Bellows; 115. Guide tube; 116. Slot; 117. Ring body; 118. Locking pin; 119. Elastic component; 121. First chamber; 122. Second chamber. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0020] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] like Figures 1 to 8As shown, this embodiment of the invention provides a double-butterfly plate type connecting pipe regulating valve (hereinafter referred to as the regulating valve), including a valve seat 101 with a medium passage 102 formed inside. Flange structures for connecting pipelines are provided on both sides of the valve seat 101. A rotatable first butterfly plate 103 is provided inside the medium passage 102. When the first butterfly plate 103 rotates, it can open or close the medium passage 102. A through hole 104 is formed through the first butterfly plate 103. A rotatable second butterfly plate 105 is provided inside the through hole 104. When the second butterfly plate 105 rotates, it can open or close the through hole 104. The valve seat 101 is provided with... The first driving member 106 for rotating the first butterfly plate 103 and the second driving member 107 for rotating the second butterfly plate 105 are both located on a preset axis and a torsion member 108 is provided between them. When it is necessary to open the medium passage 102, the second butterfly plate 105 rotates first to gradually open the central through hole 104, so that the torsion member 108 is torsionally twisted and stores torsion force. The direction of release of torsion force is the same as the direction of rotation when the first butterfly plate 103 opens the medium passage 102, so as to assist the first butterfly plate 103 in rotating to open the medium passage 102.

[0023] When it is necessary to open the medium passage 102, the second butterfly plate 105 rotates first to gradually open the central through hole 104, so that the torsion member 108 is torsion and stores torsional force. Since the release direction of the torsional force is the same as the direction of the first butterfly plate 103 when opening the medium passage 102, when the first driving member 106 makes the first butterfly plate 103 rotate, the torsional force can assist the first butterfly plate 103 in rotating to open the medium passage 102, making the opening of the regulating valve easier.

[0024] This invention can be applied to triple eccentric butterfly valves. The structure of the triple eccentric butterfly valve is described below. Firstly, the preset axis does not pass through the geometric center plane of the first butterfly plate 103 or the second butterfly plate 105, but is offset a certain distance to the other side of the sealing surface of the valve seat 101, such as... Figure 3 The preset axis is offset upwards by a certain distance, so that the first butterfly plate 103 or the second butterfly plate 105 can quickly disengage from the valve seat 101 when opened. Secondly, the preset axis does not coincide with the central axis of the medium passage 102, and there is a parallel offset, such as... Figure 3 The preset axis is offset to the left by a certain distance, which increases the separation gap between the first butterfly plate 103 and the valve seat 101 during opening, and also increases the separation gap between the second butterfly plate 105 and the first butterfly plate 103 during opening. Thirdly, the sealing surface of the valve seat 101 is designed as a conical surface with a certain inclination angle, such as... Figure 3The sealing surface on the right side of the first butterfly plate 103 or the second butterfly plate 105 is inclined, so that the sealing surface of the first butterfly plate 103 only fully contacts the conical surface of the valve seat 101 in the final stage of closing, and the sealing surface of the second butterfly plate 105 only fully contacts the conical surface of the through hole 104 in the final stage of closing. Figure 3 In this configuration, the first butterfly plate 103 opens the medium passage 102 when rotated counterclockwise and closes the medium passage 102 when rotated clockwise. The second butterfly plate 105 opens the central through hole 104 when rotated counterclockwise and closes the central through hole 104 when rotated clockwise. The specific structure and working principle of the above-mentioned triple eccentric butterfly valve are existing technologies and will not be elaborated here.

[0025] The medium can be a fluid such as water or oil. (See also...) Figure 1 and Figure 2 The first driving element 106 and the second driving element 107 are respectively disposed on both sides of the valve seat 101. Preferably, the first driving element 106 can be a hydraulic actuator, and the second driving element 107 can be an electric actuator, and both are equipped with corresponding actuators. The specific structure and working principle are existing technologies and will not be described in detail here. See also Figure 4 The first butterfly plate 103 has a first rotating shaft 109, and the first driving member 106 rotates the first rotating shaft 109 through a transmission structure. The second butterfly plate 105 has a second rotating shaft 110, and the second driving member 107 rotates the rotating shaft of the second butterfly plate 105 through a transmission structure. The transmission structure can be a bevel gear structure or a gear and rack structure. In the following text, the rotating shaft of the first butterfly plate 103 is the first rotating shaft 109, and the rotating shaft of the second butterfly plate 105 is the second rotating shaft 110. The two ends of the torsion member 108 can be connected to the rotating shafts of the first butterfly plate 103 and the second butterfly plate 105 respectively. For example, in… Figure 3 and Figure 4 In the process, when the second driving member 107 causes the shaft of the second butterfly plate 105 to rotate counterclockwise, thereby driving the second butterfly plate 105 to open the central through hole 104, the torsion member 108 generates torsion and generates a counterclockwise torsional force. This torsional force acts on the shaft of the first butterfly plate 103. When the first driving member 106 causes the shaft of the first butterfly plate 103 to rotate counterclockwise, this torsional force causes the first butterfly plate 103 to rotate counterclockwise to open the medium passage 102.

[0026] It is understood that the opening and closing actions of the first butterfly plate 103 and the second butterfly plate 105 do not interfere with each other. When both the first butterfly plate 103 and the second butterfly plate 105 are closed, the medium passage 102 can be sealed to prevent leakage. Preferably, for the entire medium passage 102, the second butterfly plate 105 can adjust the flow rate by approximately 0% to 8%, and the second butterfly plate 105 can adjust the flow rate by 8% to 100%. Of course, different sizes of the second butterfly plate 105 can be designed to achieve different ranges of flow rate adjustment. By setting the above two butterfly plates of different sizes, the flow rate adjustable range of this regulating valve is improved, making it suitable for various applications with large-diameter pipelines and wide flow rate adjustment range requirements.

[0027] In one embodiment, see [link to relevant documentation] Figure 4 and Figure 5 The torsion member 108 includes an active section and a free section along the axial direction of the preset axis. The two ends of the active section are connected to the rotating shaft of the first butterfly plate 103 and the rotating shaft of the second butterfly plate 105, respectively. When the second butterfly plate 105 rotates, the active section is torsionally twisted and stores torsional force, while the free section remains in its original state. An adjustment part is provided on the second rotating shaft 110. When the pressure value of the medium is less than or equal to the preset value, the adjustment part keeps the lengths of the active section and the free section unchanged. When the pressure value of the medium is greater than the preset value, the adjustment part reduces the length of the active section and increases the length of the free section.

[0028] When the pressure of the medium is high, the torque required to overcome the initial static friction and medium pressure is greater when opening the regulating valve, making it more difficult to open. In this invention, when the pressure of the medium is high, the length of the regulating section and the number of effective turns are reduced, increasing the torsional stiffness of the regulating section. This allows for the storage of greater torsional force when the valve is twisted, further assisting the first butterfly plate 103 in opening the medium passage 102, making the opening of the regulating valve easier.

[0029] Understandably, for torsion spring 113, under the same conditions of material, wire diameter, diameter and other factors, the shorter torsion spring 113 has fewer effective coils and a larger torsional stiffness (spring constant). Therefore, a larger torque is required to achieve the same torsion angle. Correspondingly, the torsional force stored when the torsion spring 113 is torsioned by the same angle is also greater.

[0030] In one embodiment, see [link to relevant documentation] Figure 5The adjustment unit includes a movable member 111 and multiple connecting members 112. The movable member 111 and the rotating shaft of the second butterfly plate 105 can slide relative to each other in the axial direction of a preset axis, while being relatively fixed in the circumferential direction of the preset axis. The torsion member 108 includes multiple torsion springs 113 evenly distributed along the axial direction of the preset axis. The torsion springs 113 and the connecting members 112 are alternately arranged and sequentially connected along the preset axis. The connecting member 112 has a first state and a second state. In the first state, the connecting member 112 and the movable member 111 are relatively fixed in the circumferential direction of the preset axis. In the second state, the connecting member 112 and the movable member 111 are relatively fixed in the circumferential direction of the preset axis. It can rotate relative to each other in the circumferential direction of the preset axis; when the second butterfly plate 105 rotates, only one connector 112 is in the first state, and the other connectors 112 are in the second state; when the pressure value of the medium is less than or equal to the preset value, one of the connectors 112 remains in the first state, so that the lengths of the working section and the free section remain unchanged; when the pressure value of the medium is greater than the preset value, the medium pushes the moving part 111 to move axially along the preset axis, and the connector 112 closer to the rotating shaft of the first butterfly plate 103 switches to the first state, so that the length of the working section decreases and the length of the free section increases.

[0031] When the pressure of the medium is large, the medium pushes the moving part 111 to move axially along the preset axis. The connecting part 112, which is closer to the rotating shaft of the first butterfly plate 103, switches to the first state to reduce the length of the action section and the number of effective turns, thereby increasing the torsional stiffness of the action section and storing a larger torsional force when it is torn.

[0032] In one embodiment, see [link to relevant documentation] Figure 5 The first butterfly plate 103 has a accommodating cavity formed inward from its end on the rotating shaft. The rotating shaft of the second butterfly plate 105 extends into the accommodating cavity and is rotatably connected to the rotating shaft of the first butterfly plate 103. The moving member 111 divides the accommodating cavity into a first chamber 121 and a second chamber 122 along a preset axis. The first chamber 121 is connected to the medium passage 102. The second chamber 122 is provided with a bellows 114, which is sleeved on the torsion member 108 and connected between the moving member 111 and the rotating shaft of the first butterfly plate 103. The bellows 114 can ensure the sealing of the second chamber 122.

[0033] The outer side of the movable part 111 is provided with a sealing ring to ensure that the outer side of the movable part 111 is in contact with the cavity wall.

[0034] In one embodiment, see [link to relevant documentation] Figure 5 and Figure 7The movable member 111 extends into the first chamber 121 to form a guide tube 115. The axis of the guide tube 115 coincides with a preset axis and is used to accommodate the free section. The guide tube 115 is connected to the second rotating shaft 110 by a key and a keyway, so that the movable member 111 and the guide tube 115 can only move along the axial direction of the second rotating shaft 110, but cannot rotate circumferentially along the second rotating shaft 110.

[0035] In one embodiment, see [link to relevant documentation] Figure 5 and Figure 6 The movable part 111 is annular and has a slot 116. The connecting part 112 includes a ring body 117 and a locking pin 118. The torsion spring 113 and the ring body 117 are alternately arranged and connected in sequence along a preset axis. When the movable part 111 moves axially along the preset axis, the locking pin 118 can engage with or disengage from the slot 116. When the locking pin 118 engages with the slot 116, the ring body 117 and the movable part 111 are relatively fixed in the circumferential direction of the preset axis. When the locking pin 118 disengages from the slot 116, the ring body 117 and the movable part 111 can rotate relative to each other in the circumferential direction of the preset axis. An elastic element 119 is provided between the locking pin 118 and the ring body 117. The elastic element 119 is used to make the locking pin 118 tend to engage with the locking groove 116. The locking pin 118 and the locking groove 116 have a guide structure. When the locking pin 118 engages with the locking groove 116 and the moving member 111 moves axially along the preset axis, the guide structure makes the locking pin 118 overcome the elastic force of the elastic element 119 and disengage from the locking groove 116. At least two locking grooves 116 are evenly distributed circumferentially along the preset axis. The connecting member 112 includes at least two locking pins 118, and the at least two locking pins 118 correspond one-to-one with the at least two locking grooves 116.

[0036] Specifically, see Figure 6 The slot 116 is formed from the inside to the outside on the inner wall of the moving member 111, and the upper part of the slot 116 penetrates the moving member 111, so that when the moving member 111 moves upward, the locking pin 118 can enter the slot 116. The elastic element 119 can be a compressed sheet or spring. The guide structure can be such that the lower surface of the end of the locking pin 118 and the lower surface of the slot 116 are both inclined surfaces. When the locking pin 118 is engaged with the slot 116, the inclined surface of the lower surface of the end of the locking pin 118 contacts the inclined surface of the lower surface of the slot 116. When the locking pin 118 is engaged with the slot 116 and the moving member 111 moves axially along a preset axis, under the action of the two inclined surfaces, the locking pin 118 overcomes the elastic force of the elastic element 119 and disengages from the slot 116.

[0037] The torsion spring 113 and the ring 117 are alternately arranged and connected sequentially along a preset axis, as shown in [reference]. Figure 5 and Figure 8The upper end of the top torsion spring 113 is directly fixed to the first rotating shaft 109, and the lower end of the top torsion spring 113 is fixed to the first ring 117, and so on, with the connecting piece 112 at the bottom. Figure 5 In the middle section, the bottommost locking pin 118 engages with the locking groove 116. At this time, all torsion springs 113 are active segments, meaning the active segments are at their longest, while the free segments are zero in length. When the pressure of the medium exceeds a preset value, the medium pushes the ring 117 upward, causing the bottommost locking pin 118 to disengage from the locking groove 116. The ring 117 continues to move upward, compressing the volume of the second chamber 122 until one of the upper locking pins 118 engages with the locking groove 116, for example, the second locking pin 118 from bottom to top engages with the locking groove 116. At this time, the four upper torsion springs 113 are active segments, with their lengths decreasing, while the bottommost torsion spring 113 is a free segment, with its length increasing.

[0038] Optionally, in order to ensure that when the second butterfly plate 105 rotates, only one connector 112 is in the first state and the other connectors 112 are in the second state, the number of connectors 112 should be set as much as possible while taking into account the volume of the accommodating cavity and the effective number of turns of the torsion spring 113.

[0039] The working principle of this invention is as follows: Two pipelines are connected by a flange structure. When it is necessary to open the medium passage 102 so that the medium can flow from one pipeline to the other, the second driving member 107 causes the second butterfly plate 105 to rotate first to gradually open the central through hole 104, so that the working section of the torsion member 108 is twisted and stores torsional force. Since the release direction of the torsional force is the same as the direction of the first butterfly plate 103 when opening the medium passage 102, when the first driving member 106 rotates the first butterfly plate 103, the torsional force can assist the first butterfly plate 103 in rotating to open the medium passage 102, making the opening of the regulating valve easier.

[0040] When the pressure of the medium is high, the medium pushes the ring 117 from the first chamber 121 to the second chamber 122, causing the locking pin 118, which is currently engaged with the locking groove 116, to disengage from the locking groove 116. The ring 117 and the moving part 111 can rotate relative to each other in the circumferential direction of the preset axis until the locking pin 118, which is closer to the second chamber 122, engages with the locking groove 116. The ring 117 and the moving part 111, which are closer to the second chamber 122, are fixed relative to each other in the circumferential direction of the preset axis to reduce the length of the working section and the number of effective turns, thereby increasing the torsional stiffness of the working section and storing greater torsional force when it is torn. This further assists the first butterfly plate 103 in opening the medium passage 102, making the opening of the regulating valve easier.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A double-butterfly plate type connecting pipe regulating valve, characterized in that, The valve includes a valve seat with an internal medium passage, a first rotatable butterfly plate within the medium passage that opens or closes the medium passage when rotated, a central through hole through the first butterfly plate, and a second rotatable butterfly plate within the central through hole that opens or closes the central through hole when rotated. The valve seat is equipped with a first drive member for rotating the first butterfly plate and a second drive member for rotating the second butterfly plate. The rotation axes of the first and second butterfly plates coincide on a preset axis, and a torsion member is provided between them. When it is necessary to open the medium passage, the second butterfly plate rotates first to gradually open the central through hole, causing the torsion member to be torsionped and storing torsional force. The direction of the torsional force release is the same as the direction in which the first butterfly plate opens the medium passage, thus assisting the first butterfly plate in rotating to open the medium passage. The torsion member includes an active section and a free section along the preset axis. The two ends of the active section are connected to the rotating shafts of the first and second discs, respectively. When the second disc rotates, the active section is torsionally twisted and stores torsional force, while the free section remains unchanged. An adjustment part is provided on the second rotating shaft. When the pressure value of the medium is less than or equal to the preset value, the adjustment part keeps the lengths of both the active and free sections constant. When the pressure value of the medium is greater than the preset value, the adjustment part reduces the length of the active section and increases the length of the free section.

2. The double-butterfly plate type connecting pipe regulating valve according to claim 1, characterized in that, The adjustment unit includes a movable member and multiple connecting members. The movable member and the rotating shaft of the second butterfly plate can slide relative to each other in the axial direction of a preset axis, while being relatively fixed in the circumferential direction of the preset axis. The torsion member includes multiple torsion springs evenly distributed along the axial direction of the preset axis. The torsion springs and the connecting members are alternately arranged and sequentially connected along the preset axis. The connecting members have a first state and a second state. In the first state, the connecting member and the movable member are relatively fixed in the circumferential direction of the preset axis. In the second state, the connecting member and the movable member can rotate relative to each other in the circumferential direction of the preset axis. When the second butterfly plate rotates, only one connecting member is in the first state, and the other connecting members are in the second state. When the pressure of the medium is less than or equal to the preset value, one of the connecting parts remains in the first state, so that the lengths of the active section and the free section remain unchanged; when the pressure of the medium is greater than the preset value, the medium pushes the moving part to move axially along the preset axis, and the connecting part closer to the first disc switches to the first state, so that the length of the active section decreases and the length of the free section increases.

3. The double-butterfly plate type connecting pipe regulating valve according to claim 2, characterized in that, The first butterfly plate has a accommodating cavity formed inward from its end on the rotating shaft. The rotating shaft of the second butterfly plate extends into the accommodating cavity. The moving member divides the accommodating cavity into a first chamber and a second chamber on the preset axis. The first chamber is connected to the medium passage. The second chamber is provided with a bellows, which is sleeved on the outside of the torsion member and connected between the moving member and the rotating shaft of the first butterfly plate.

4. The double-butterfly plate type connecting pipe regulating valve according to claim 2, characterized in that, The movable part is annular and has a slot. The connecting part includes a ring body and a locking pin. The torsion spring and the ring body are alternately arranged and connected in sequence along a preset axis. When the movable part moves axially along the preset axis, the locking pin can engage with or disengage from the slot. When the locking pin engages with the slot, the ring body and the movable part are relatively fixed in the circumferential direction of the preset axis. When the locking pin disengages from the slot, the ring body and the movable part can rotate relative to each other in the circumferential direction of the preset axis.

5. The double-butterfly plate type connecting pipe regulating valve according to claim 4, characterized in that, An elastic element is provided between the pin and the ring body. The elastic element is used to make the pin tend to engage with the slot. The pin and the slot have a guide structure. When the pin engages with the slot and the moving part moves axially along the preset axis, the guide structure makes the pin overcome the elastic force of the elastic element and disengage from the slot.

6. The double-butterfly plate type connecting pipe regulating valve according to claim 4, characterized in that, At least two slots are evenly distributed circumferentially along a preset axis, and the connector includes at least two locking pins, with each locking pin corresponding to one of the at least two slots.

7. The double-butterfly plate type connecting pipe regulating valve according to claim 3, characterized in that, The movable component extends into the first chamber and forms a guide tube. The axis of the guide tube coincides with a preset axis. The guide tube is used to accommodate the free segment.

8. The double-butterfly plate type connecting pipe regulating valve according to claim 1, characterized in that, The rotating shaft of the first butterfly plate is rotatably connected to the rotating shaft of the second butterfly plate.

9. The double-butterfly plate type connecting pipe regulating valve according to claim 1, characterized in that, Flange structures for connecting pipelines are provided on both sides of the valve seat.

Images