Double-seal butterfly valve

Abstract

This invention discloses a double-sided sealed butterfly valve, comprising a valve body, a butterfly plate, a valve shaft, and a sealing ring. The sealing ring is hollow and has an interface. The valve body has the following features: an adjustment chamber inside its side wall; a first channel, one end of which is connected to the adjustment chamber and the other end to a channel in the valve body; a second channel, one end of which is connected to the adjustment chamber and the other end to a channel in the valve body, wherein when the butterfly plate is closed, the first and second channels are located on opposite sides of the butterfly plate; a third channel, connected to the adjustment chamber, the other end of which extends radially along the valve body channel into an opening groove in the valve seat, the interface being sealed and accommodated within the third channel; and a valve fixed within the adjustment chamber, which, when pressed, switches between a first state and a second state and maintains the switched state after the pressure is removed, the valve having a through hole.

Description

Technical Field

[0001] This invention belongs to the field of valve technology, and particularly relates to a butterfly valve with double-sided sealing. Background Technology

[0002] A valve is a device that uses a moving part to open, close, or partially block one or more openings or passages, allowing, blocking, or regulating the flow of liquids, air, or other airflows or large quantities of loose material.

[0003] A butterfly valve, also known as a flap valve, is a type of simple regulating valve, mainly composed of a valve body, valve stem, butterfly plate, and sealing ring. The valve body is cylindrical with a short axial length and contains a built-in butterfly plate. The opening and closing element of the butterfly valve is a disc-shaped butterfly plate that rotates around its own axis within the valve body to achieve opening, closing, or regulation. The butterfly plate is driven by the valve stem; a 90° rotation completes one opening and closing cycle. Changing the deflection angle of the butterfly plate controls the flow rate of the medium.

[0004] During use, when the medium flows in reverse and the medium pressure is high, the pressure will push the butterfly plate to a certain displacement, thus creating a gap between it and the valve seat and causing leakage. Some butterfly valves solve this problem by increasing the torsional force of the valve stem, thereby increasing the tightness between the butterfly plate and the valve seat when closed, in order to prevent the medium from impacting the butterfly plate and causing it to displace, thus ensuring the valve's sealing performance. However, this method makes the valve very difficult to open and close, thus affecting the ease of valve operation.

[0005] In the prior art, Chinese patent applications with application numbers 201410052418.7 and 200910096151.0 both involve setting a suspended valve seat and a bellows with an annular boss on the inner wall of the valve body channel connecting the valve seat and the valve body. The pressure difference on both sides can be used to form a pressure difference that fills and stretches the bellows, thereby pressing the sealing surface of the valve seat against the sealing surface of the butterfly plate.

[0006] In the prior art, there is also a Chinese patent application with application number 201710670551.2, which sets a hollow sealing ring to contact the sealing surface of the butterfly plate, and sets a sealing sleeve, a sealing sleeve cover, a shuttle body, and a shuttle core. The shuttle core moves under the action of medium pressure, causing the hollow sealing ring to expand outward under pressure and squeeze the sealing surface of the butterfly plate. Summary of the Invention

[0007] This application proposes a double-sided sealing butterfly valve to address the aforementioned technical problems. The specific technical solution is as follows:

[0008] A double-sided sealed butterfly valve includes a valve body, a butterfly plate disposed within a valve body channel, and a valve shaft penetrating the valve body and fixed to the butterfly plate for controlling the rotation of the butterfly plate. The inner wall of the valve body channel has a valve seat, which has a mating sealing surface with the butterfly plate. An opening groove is provided on the sealing surface of the valve seat, and a sealing ring is disposed within the opening groove. The sealing ring is hollow and has an interface. The valve body's sidewall interior has:

[0009] Adjustment chamber;

[0010] The first channel has one end connected to the regulating chamber and the other end connected to the channel of the valve body;

[0011] The second channel has one end connected to the regulating chamber and the other end connected to the channel of the valve body. When the butterfly plate is in the closed state, the first channel and the second channel are located on both sides of the butterfly plate.

[0012] The third channel is connected to the regulating chamber of the third channel, and the other end extends radially along the valve body channel to the opening groove of the valve seat. The interface is sealed and accommodated in the third channel.

[0013] A valve, which is fixed in an adjustment cavity, switches between a first state and a second state when the valve is compressed and maintains the switched state after the pressure is removed. The valve has a through hole.

[0014] When the disc is closed, the valve responds to a positive pressure difference between the first and second channels and is in or jumps to the first state. In the first state, the valve blocks the second channel and connects the first and third channels through a through hole. When the valve responds to a negative pressure difference between the first and second channels and is in or jumps to the second state, the valve blocks the first channel and connects the second and third channels.

[0015] Furthermore, the valve includes a planar portion, an edge portion, and a side portion connecting the planar portion and the edge portion. The through hole is disposed on the planar portion, and when the valve is in a first state, the through hole is aligned with the third channel. The side portion can switch between the first state and the second state in response to the pressure difference between the first channel and the second channel.

[0016] Furthermore, the adjustment cavity is a state in which two valves are symmetrically joined together, so that the valves are attached to the inner wall of the adjustment cavity in both the first and second states. Based on the symmetry plane of the adjustment cavity, the first channel and the second channel are located on both sides of the symmetry plane.

[0017] Furthermore, the valve has an internal skeleton, and the skeleton is injection molded in one piece to form a planar portion, an edge portion, and a side portion. The skeleton is supported on the edge portion and the side portion. The portion of the skeleton supported on the side portion consists of spaced elastic sheets. When the elastic sheets are compressed, they switch between a first state and a second state and maintain the switched state after the pressure is removed.

[0018] Furthermore, the middle part of the adjustment cavity has a groove for the edge part to be embedded and fixed.

[0019] Furthermore, the valve body includes a first cylindrical body and a second cylindrical body, the second cylindrical body being detachably embedded and fixed within the first cylindrical body from one end of the first cylindrical body, the inner side of the first cylindrical body abutting a stop surface having the end face of the second cylindrical body, and the adjusting cavity, the third channel, and the opening groove being formed on the contact surface of the first and second cylindrical bodies.

[0020] The beneficial effects of this invention are as follows:

[0021] (1) The butterfly valve of the present invention has an adjustment chamber inside the side wall of the valve body and a valve is set in the adjustment chamber. The force applied to the valve by the fluid pressure difference causes the valve to deform, thereby changing the state of communication with the sealing ring. The fluid on the high-pressure side applies pressure to the inside of the sealing ring. The inside of the sealing ring expands after being pressured and is squeezed on the sealing surface of the butterfly plate to generate a sealing pressure to seal the valve.

[0022] (2) The valve only needs to overcome the resistance of the internal fluid when it jumps, without having to overcome the frictional force. Moreover, the distance of the valve jump is much smaller than the distance of the slide when the spindle moves. Therefore, when pressure fluctuations occur on both sides of the disc, the valve will respond more quickly and be more sensitive.

[0023] (3) A fixed valve seat is adopted. The sealing ring is accommodated by slotting the valve seat and the sealing ring is hollow. The fluid pressure difference on both sides when the butterfly plate is closed is used to fill the sealing ring with pressure and expand it, and squeeze it on the sealing surface of the butterfly plate to generate a sealing pressure to seal the valve. Compared with the floating valve seat structure with bellows connection, it has better structural stability and durability. Attached Figure Description

[0024] Figure 1 The diagram shown is a three-dimensional structural diagram of a butterfly valve;

[0025] Figure 2 The image shown is a front view of the butterfly valve;

[0026] Figure 3 What is shown is Figure 2 Sectional view of AA;

[0027] Figure 4 The diagram shown is a schematic of an explosion of a butterfly valve;

[0028] Figure 5 What is shown is Figure 3 A magnified view of a section at point B in the middle;

[0029] Figure 6 The diagram shown is a schematic of the valve structure;

[0030] Figure 7 This is a schematic diagram of the internal structure of the valve;

[0031] Figure 8 What is shown is Figure 4 A magnified view of a section at point C. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0033] Example

[0034] Figure 1 The diagram shown is a three-dimensional structural diagram of a butterfly valve. Figure 2 The diagram shows the front view of a butterfly valve. The butterfly valve includes a valve body 100, a butterfly plate 200, and a valve shaft 300. The butterfly plate 200 is disposed within the internal channel of the valve body 100. The valve shaft 300 extends radially through the valve body 100 into the internal channel. The butterfly plate 200 and the valve shaft 300 are fixedly connected, and the rotation of the valve shaft 300 drives the butterfly plate 200 to rotate, thereby enabling the butterfly plate 200 to control the opening and closing of the internal channel of the valve body 100.

[0035] Figure 3 What is shown is Figure 2 Sectional view of AA, Figure 4 This is an explosion diagram of a butterfly valve, combined with... Figure 3 and Figure 4 The valve body 100 includes a first cylindrical body 110, a second cylindrical body 120, a valve 130, and a sealing ring 140. The second cylindrical body 120 is detachably embedded in and fixed within the first cylindrical body 110 from one end of the first cylindrical body 110. The valve 130 and the sealing ring 140 are fixed between the first cylindrical body 110 and the second cylindrical body 120, and the first cylindrical body 110, the second cylindrical body 120, and the sealing ring 140 are coaxially arranged.

[0036] Combination Figure 3With the working state of the butterfly plate 200 as an indicator, when the butterfly plate 200 closes the internal channel of the valve body 100, the butterfly plate 200 divides the internal channel of the valve body 100 into a first fluid region M and a second fluid region N. When the butterfly plate 200 is in the closed state, there will be a certain pressure difference between the first fluid region M and the second fluid region N due to the working environment.

[0037] Figure 5 What is shown is Figure 3 The enlarged view at point B shows that the valve body 100 has a first channel 111, a second channel 112, an adjustment chamber 150, and a third channel 113 inside its side wall. When the butterfly plate 200 is closed, the two ends of the first channel 111 are connected to the first fluid region M and the adjustment chamber 150, respectively. The two ends of the second channel 112 are connected to the second fluid region N and the adjustment chamber 150, respectively. One end of the third channel 113 is connected to the adjustment chamber 150, and the other end extends toward the sealing surface of the butterfly plate 200. The valve 130 is fixedly installed inside the adjustment chamber 150, dividing the adjustment chamber 150 into a first pressure chamber 151 and a second pressure chamber 152. The first pressure chamber 151 is connected to the first channel 111, and the second pressure chamber 152 is connected to the second channel 112.

[0038] The sealing ring 140 is disposed on the outer side of the sealing surface of the butterfly plate 200, and the sealing ring 140 has a hollow structure. The sealing ring 140 has a rigid interface 141, which is accommodated in the third channel 113.

[0039] More importantly, the state of valve 130 in adjustment chamber 150 is variable. The state of valve 130 changes according to the fluid pressure difference between the first fluid region M and the second fluid region N: fluid in the first fluid region M enters the adjustment chamber 150 through the first channel 1, and fluid in the second fluid region N enters the adjustment chamber 150 through the second channel 112. When there is a positive pressure difference between the first fluid region M and the second fluid region N, the fluid in the first fluid region M will compress valve 130, causing valve 130 to deform towards the third channel 113 and completely fit the adjustment chamber. The inner wall of the cavity 150 has a through hole 131 in the middle of the valve 130, which corresponds to the third channel 113. The side of the valve 130 blocks the second channel 112. At this time, the first pressure chamber 151 is fully formed, and the second pressure chamber 152 disappears, forming a connected state of the third channel 113, the first pressure chamber 151, the first channel 1, and the first fluid region M. The fluid in the first fluid region M fills into the sealing ring 140 through the rigid interface 141. The sealing ring 140 expands under pressure and is squeezed onto the sealing surface of the butterfly plate 200, generating a sealing pressure sealing valve.

[0040] When there is a negative pressure difference between the first fluid region M and the second fluid region N, the fluid in the second fluid region N will squeeze the valve 130, causing the valve 130 to deform away from the third channel 113 and completely fit the inner wall of the regulating cavity 150. At this time, the side of the valve 130 will block the first channel 1, the second pressure chamber 152 will be fully formed, and the first pressure chamber 151 will disappear, forming a communication state between the third channel 113, the second pressure chamber 152, the second channel 112, and the second fluid region N. The fluid in the second fluid region N will fill the sealing ring 140 through the rigid interface 141. The sealing ring 140 will expand under pressure and squeeze onto the sealing surface of the butterfly plate 200, generating a sealing pressure sealing valve.

[0041] Figure 6 The diagram shows the structure of valve 130, which is bowl-shaped and includes a planar portion 132, an edge portion 133, and a side portion 134 connecting the planar portion 132 and the edge portion 133. The side portion 134 can undergo elastic deformation, which causes the planar portion 132 to bounce on both sides of the plane where the edge portion 133 is located, thereby forming a first pressure chamber 151 and a second pressure chamber 152 respectively. A through hole 131 is provided on the planar portion 132. The adjustment cavity 150 is a state in which the two valves 130 are symmetrically joined, so that the valves 130 can fit into the adjustment cavity 150 after deforming towards the third channel 113 and away from the third channel 113. The edge portion 133 is used to fix and lock the valves 130 in the adjustment cavity 150.

[0042] Figure 7 The diagram shows the internal structure of valve 130. Valve 130 has a framework 135 internally, supported by an edge portion 133 and a side portion 134. The framework 135 in the edge portion 133 is annular, while the framework 135 in the side portion 134 consists of spaced elastic sheets. These elastic sheets maintain their original state under stress. When subjected to a certain force, the elastic sheets deform and fold, maintaining their folded state. This principle is similar to that of the clips in existing hair clips. The framework 135 in the edge portion 133 and the side portion 134 is integrally formed. The outer surface of the framework 135 is molded in one piece using injection molding to create the planar portion 132, the edge portion 133, and the side portion 134.

[0043] Figure 8 What is shown is Figure 4 A magnified view of a section at point C, combined with... Figures 3-5As described above, to facilitate the assembly of the valve body 100, the valve body 100 includes a first cylindrical body 110, a second cylindrical body 120, a valve 130, and a sealing ring 140. A coaxial stop surface 114 is machined on the inner side of the first cylindrical body 110. During assembly, one end face of the second cylindrical body 120 abuts against the stop surface 110. Simultaneously, a third channel 113, an adjusting cavity 150, and half of an opening groove for accommodating the sealing ring 140 are machined on the stop surface 114. The other half of the third channel 113, the adjusting cavity 150, and the opening groove for accommodating the sealing ring 140 are also machined on the stop surface 114. Half of it is on the end face of the second cylindrical body 120 that abuts against the stop surface 11d; before assembly, the sealing ring 140 and the valve 130 are placed. When the second cylindrical body 120 is assembled into the first cylindrical body 110, a complete third channel 113, an adjustment cavity 150 and an opening groove for accommodating the sealing ring 140 will be formed, and the internal sealing ring 140 and valve 130 will be fixed at the same time; the first channel 111 is directly formed by machining the second cylindrical body 120 with a machine tool, and the second channel 112 is directly formed by machining the first cylindrical body 110 with a machine tool.

[0044] The sealing ring 140 has valve seats on both sides that cooperate with the butterfly plate 200 for sealing. That is, part of the valve seat is formed on the inner wall of the first cylindrical body 110, and the other part is formed on the inner wall of the second cylindrical body 120.

[0045] The adjustment cavity 150 has a groove 154 in the middle for the edge portion 133 to be inserted.

[0046] Compared to the suspended valve seat structure with bellows connection, the butterfly valve of this application has better structural stability and durability. When the suspended valve seat with bellows connection is in the open state, because a gap needs to be set between the valve seat and the inner wall of the valve body channel for fluid to pass through, and the valve seat is only connected to the bellows and floats in the valve body channel, the valve body is very easy to shake and collide with the inner wall of the valve body channel under the disturbance of the fluid when the butterfly valve is open, which will accelerate the damage of internal structural components and reduce durability.

[0047] In this application, a fixed valve seat is used. The sealing ring 140 is accommodated by slotting around the valve seat and is hollow. When the butterfly plate 200 is closed, the fluid pressure difference on both sides fills and pressurizes the sealing ring 140, which is then squeezed onto the sealing surface of the butterfly plate 200 to generate a sealing pressure to seal the valve.

[0048] Compared to the structure using a shuttle core, the butterfly valve of this application has better sensitivity. The structure using a shuttle core is set in a suitable channel. When the pressure on both sides changes, the shuttle core will move left and right in response to the pressure change. This movement must overcome the resistance of the fluid inside the channel and the friction between the inner wall of the channel and the shuttle core. Moreover, the shuttle core needs to move a certain distance through the middle to fully allow the fluid on the higher pressure side to enter the sealing ring.

[0049] In this application, an adjustment cavity 150 is formed inside the side wall of the valve body 100, and a valve 130 is set in the adjustment cavity 150. The force applied to the valve 130 by the fluid pressure difference causes the valve 130 to deform, thereby changing the state of conduction with the sealing ring 140. The valve 130 only needs to overcome the resistance of the internal fluid when it jumps, without having to overcome the frictional force. Moreover, the distance of the valve 130 jumping is much smaller than the distance of the bobbin sliding when it moves. Therefore, when pressure fluctuations occur on both sides of the butterfly plate 200, the valve 130 responds more quickly and has higher sensitivity.

[0050] In addition, the sealing gaskets required on the sealing surfaces involved in the assembly of the first cylindrical body 110 and the second cylindrical body in this application are added according to the sealing performance requirements under specific working conditions.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A butterfly valve with double-sided sealing, characterized in that, The valve includes a valve body, a butterfly plate disposed within a valve body channel, and a valve shaft penetrating the valve body and fixed to the butterfly plate for controlling the rotation of the butterfly plate. The inner wall of the valve body channel has a valve seat, which has a mating sealing surface with the butterfly plate. An opening groove is provided on the sealing surface of the valve seat, and a sealing ring is disposed within the opening groove. The sealing ring is hollow and has an interface. The valve body's side wall interior has: Adjustment chamber; The first channel has one end connected to the regulating chamber and the other end connected to the channel of the valve body; The second channel has one end connected to the regulating chamber and the other end connected to the channel of the valve body. When the butterfly plate is in the closed state, the first channel and the second channel are located on both sides of the butterfly plate. The third channel has one end connected to the regulating chamber and the other end extending radially along the valve body channel into the opening groove of the valve seat, and the interface is sealed and accommodated in the third channel; A valve, which is fixed in an adjustment cavity, switches between a first state and a second state when the valve is compressed and maintains the switched state after the pressure is removed. The valve has a through hole. When the disc is closed, the valve responds to a positive pressure difference between the first and second channels and is in or jumps to the first state. In the first state, the valve blocks the second channel and connects the first and third channels through a through hole. When the valve responds to a negative pressure difference between the first and second channels and is in or jumps to the second state, the valve blocks the first channel and connects the second and third channels.

2. The double-sided sealing butterfly valve according to claim 1, characterized in that, The valve is bowl-shaped and includes a planar portion, an edge portion, and a side portion connecting the planar portion and the edge portion. The through hole is disposed on the planar portion, and the valve is in a first state where the through hole is aligned with a third channel. The side portion can switch between the first state and the second state in response to the pressure difference between the first channel and the second channel.

3. The double-sided sealing butterfly valve according to claim 2, characterized in that, The adjustment cavity is a state in which two valves are symmetrically joined together, so that the valves are attached to the inner wall of the adjustment cavity in both the first and second states. Based on the symmetry plane of the adjustment cavity, the first channel and the second channel are located on both sides of the symmetry plane.

4. The double-sided sealing butterfly valve according to claim 2, characterized in that, The valve has an internal skeleton, and the skeleton is injection molded in one piece to form a planar part, an edge part, and a side part. The skeleton is supported on the edge part and the side part. The part of the skeleton supported on the side part consists of spaced elastic sheets. When the elastic sheets are compressed, they switch between a first state and a second state and maintain the switched state after the pressure is removed.

5. The double-sided sealing butterfly valve according to claim 2, characterized in that, The adjustment cavity has a groove in the middle for the edge portion to be inserted and fixed.

6. The double-sided sealing butterfly valve according to claim 1, characterized in that, The valve body includes a first cylindrical body and a second cylindrical body. The second cylindrical body is detachably embedded into and fixed by one end of the first cylindrical body. The inner side of the first cylindrical body has a stop surface that abuts against the end face of the second cylindrical body. The adjusting cavity, the third channel, and the opening groove are formed on the contact surface of the first and second cylindrical bodies.

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