Pressure relief butterfly valve

Abstract

The invention relates to the technical field of butterfly valves, in particular to a pressure relief butterfly valve. The pressure relief butterfly valve comprises a valve body, a valve core and a pressure relief valve core, the butterfly plate is rotatably arranged in the medium channel, and a pressure relief through hole is formed in the butterfly plate; the valve rod is sleeved with the rotating block, the rotating block is tightly matched with the valve rod, the rotating block is located on one side of the butterfly plate, a sealing cover is arranged on the rotating block, in the sealing state, the sealing cover is tightly matched with the pressure relief through hole, in the pressure relief state, the sealing cover is separated from the pressure relief through hole, and the valve rod is used for driving the rotating block to move. The rotating block is switched from a sealing state to a pressure relief state; and the reset elastic component is used for providing elastic driving force for switching the rotating block from the pressure relief state to the sealing state. And in the pressure relief state, the sealing cover is separated from the pressure relief through hole, and a medium can flow through the pressure relief through hole, so that the torque required when the valve is opened is reduced, the problems of vibration and abrasion of the valve are solved, and the reliability and the safety of the valve are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of butterfly valves, in particular to a pressure relief butterfly valve. BACKGROUND

[0002] In the traditional design of three-eccentric butterfly valves, the introduction of the second eccentric structure results in a large eccentric torque in the medium flow state. This design causes the sealing ring assembly to present a conical fitting sealing mode under the action of the medium pressure. With the closing of the valve, the sealing ring assembly will be pressed tighter due to the action of the medium, forming a self-locking effect. Under this effect, the sealing performance will indeed gradually increase, but at the same time, it also brings a problem that cannot be ignored: in order to overcome the force generated by the medium, the torque required for opening the valve will become quite large, and the rigidity of the valve stem itself may not be enough to resist these torques. In addition, at the moment of opening the valve, due to the action of the medium force, the valve is prone to vibration, which further aggravates the wear of the valve and further affects its reliability and safety. SUMMARY

[0003] Therefore, the present application provides a pressure relief butterfly valve to solve the problem that the torque required for opening the valve will become quite large, and the rigidity of the valve stem itself may not be enough to resist these torques. In addition, at the moment of opening the valve, due to the action of the medium force, the valve is prone to vibration, which further aggravates the wear of the valve and further affects its reliability and safety.

[0004] The present application provides a pressure relief butterfly valve, comprising:

[0005] a valve body having a medium channel;

[0006] a butterfly plate rotatably arranged in the medium channel, the butterfly plate being provided with a pressure relief through hole;

[0007] a rotating block sleeved on the valve stem, the rotating block being in close fit with the valve stem, the rotating block being located on one side of the butterfly plate, the rotating block being provided with a sealing cover, in a sealing state, the sealing cover being in close fit with the pressure relief through hole, in a pressure relief state, the sealing cover being separated from the pressure relief through hole, the valve stem being used to drive the rotating block to move, so as to switch the rotating block from the sealing state to the pressure relief state;

[0008] a reset elastic force assembly for providing an elastic driving force for switching the rotating block from the pressure relief state to the sealing state.

[0009] Advantages:

[0010] By setting the pressure relief through hole, and setting the sealing cover on the rotating block, in the sealed state, the sealing cover is closely matched with the pressure relief through hole to achieve the normal cutting of the medium; in the pressure relief state, the sealing cover is separated from the pressure relief through hole, and the medium can flow through the pressure relief through hole, thereby reducing the torque required when the valve is opened, avoiding the problem of valve vibration and wear caused by medium force, and improving the reliability and safety of the valve. Secondly, the design of the reset elastic force assembly enables the rotating block to automatically reset when switching from the pressure relief state to the sealed state, without the need for additional operations, simplifying the operation process and improving work efficiency.

[0011] In an alternative embodiment, the pressure relief through hole has a sealing seat, the sealing seat has a first through hole, and the sealing seat and the inner wall of the pressure relief through hole have a sealing structure. The pressure relief through hole has a first elastic member, which provides the sealing seat with an elastic driving force in the direction of moving close to the sealing cover. Under the elastic driving force, the first elastic member makes the sealing seat closely match the sealing cover to seal the first through hole.

[0012] Advantages:

[0013] The first elastic member provides the sealing seat with a continuous elastic driving force, ensuring the close fit between the sealing seat and the sealing cover, effectively preventing medium leakage, and improving the sealing performance of the valve. Furthermore, the sealing structure between the sealing seat and the inner wall of the pressure relief through hole further enhances the sealing effect of the valve, so that the medium can only flow between the cavities through the first through hole, avoiding leakage of the medium. The design structure is compact, easy to operate, easy to maintain and replace the sealing member, and reduces the use cost.

[0014] In an alternative embodiment, the pressure relief through hole is provided with a sealing cavity, a sliding cavity and a fixed cavity. The sealing cavity is located at one end of the pressure relief through hole close to the sealing cover, the fixed cavity is located at one end of the pressure relief through hole away from the sealing cover, and the sliding cavity is located between the sealing cavity and the fixed cavity. The sealing cavity, the sliding cavity and the fixed cavity are in communication with each other. The sealing seat is slidably arranged in the sliding cavity. The fixed block is fixedly arranged in the fixed cavity, and the second through hole communicating with the first through hole is formed in the fixed block. The first elastic member is arranged between the fixed block and the sealing seat. In the sealed state, the sealing cover is located in the sealing cavity and closely matches the sealing seat.

[0015] Advantages:

[0016] By arranging the sealing cavity, the sliding cavity and the fixed cavity separately, stable sliding of the sealing seat in the sliding cavity is realized, and meanwhile, the close fit of the sealing seat and the sealing cover in the sealing state is ensured, and the setting of the fixed block not only provides stable support for the first elastic member, but also ensures smooth flow of the medium in the pressure relief state through the intercommunication of the second through hole and the first through hole.

[0017] In an alternative embodiment, the sealing cavity and the sliding cavity have an annular protrusion, the sealing seat comprises a first sealing part and a second sealing part, the outer diameter of the first sealing part is smaller than that of the second sealing part, and the first sealing part extends into the sealing cavity through the annular protrusion, and the annular protrusion is used for limiting the second sealing part.

[0018] Advantages:

[0019] Through the limiting effect of the annular protrusion, the stable position of the sealing seat in the pressure relief through hole is ensured, and meanwhile, the first sealing part extends into the sealing cavity through the annular protrusion, thereby increasing the contact area with the sealing cover and improving the reliability and stability of the sealing.

[0020] In an alternative embodiment, the sealing structure comprises a graphite ring and an O-shaped ring, and the graphite ring and the O-shaped ring are arranged at intervals, and the graphite ring is arranged on the side of the O-shaped ring close to the sealing cover.

[0021] Advantages:

[0022] The graphite ring has excellent wear resistance and can effectively resist the erosion and wear of the medium, thereby prolonging the service life of the sealing structure, and the O-shaped ring has good elasticity and sealing performance and can ensure the close fit between the sealing seat and the inner wall of the pressure relief through hole, thereby effectively preventing the leakage of the medium, and the combination of the graphite ring and the O-shaped ring not only improves the sealing performance of the valve, but also enhances the durability and reliability of the valve.

[0023] In an alternative embodiment, the outer wall of the sealing seat is provided with a first annular groove and a second annular groove, and the graphite ring and the O-shaped ring are arranged in the first annular groove and the second annular groove, respectively.

[0024] Advantages:

[0025] The graphite ring and the O-shaped ring are respectively embedded in the first annular groove and the second annular groove and tightly fit with the outer wall of the sealing seat, thereby effectively preventing the leakage of the medium through the gap between the sealing seat and the inner wall of the pressure relief through hole, and further improving the sealing effect of the valve.

[0026] In an alternative embodiment, the sealing cover is arranged on one side of the rotating block, and the reset elastic component is arranged on the other side of the rotating block, the reset elastic component comprising a second elastic member, both ends of the second elastic member being connected with the rotating block and the butterfly plate respectively.

[0027] Advantages:

[0028] By arranging the second elastic member, both ends of the second elastic member being connected with the rotating block and the butterfly plate respectively, the rotating block can be automatically reset when switching from the pressure relief state to the sealing state, without the need for additional operations, further simplifying the operation process and improving the work efficiency. The design of the second elastic member enables the rotating block to automatically return to the initial position after being rotated by external force, ensuring the stability and reliability of the valve.

[0029] In an alternative embodiment, the butterfly plate is provided with a guide groove, one end of the second elastic member being connected with the bottom of the guide groove, and the reset elastic component further comprises a guide member, the guide member being fixedly arranged on the rotating block, and the other end of the second elastic member being sleeved on the guide member.

[0030] Advantages:

[0031] The guide member is fixedly arranged on the rotating block, and the other end of the second elastic member is sleeved on the guide member, the design of the guide member further enhancing the stability and guidance of the second elastic member, enabling the second elastic member to be more smooth during extension and contraction and not easily disturbed by external factors. Through the cooperation of the guide groove and the guide member, the automatic reset of the rotating block when switching from the pressure relief state to the sealing state is realized, and the reset process is stable and reliable, further improving the work efficiency and reliability of the valve.

[0032] In an alternative embodiment, the rotating block has a connecting through hole, the inner wall of the connecting through hole has a first fixing groove, the valve rod is provided with a second fixing groove matched with the first fixing groove, the rotating block is sleeved on the valve rod through the connecting through hole, and a fixing key is inserted into the first fixing groove and the second fixing groove to fixedly connect the rotating block with the valve rod.

[0033] Advantages:

[0034] By arranging the first fixing groove, the second fixing groove and the fixing key, the installation and disassembly of the rotating block and the valve rod are facilitated, and the work efficiency is improved.

[0035] In an alternative embodiment, one side of the rotating block facing the butterfly plate is arc-shaped, and the side surface of the butterfly plate facing the rotating block is configured as an arc surface, the arc surface and the butterfly plate having a clearance.

[0036] Advantages:

[0037] The avoiding position between the arc surface and the rotating block can also avoid interference or jamming phenomenon during the rotation of the rotating block, so that the rotating block rotates more smoothly, and in addition, the arc design can also reduce the erosion of the medium to the rotating block and the butterfly plate, thereby prolonging the service life of the valve. During the rotation of the rotating block, the cooperation of the arc surface and the avoiding position enables the rotating block to smoothly drive the butterfly plate to rotate, thereby realizing the opening or closing operation of the medium passage. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0039] Figure 1 It is a horizontal sectional view of a pressure relief butterfly valve of an embodiment of the present application.

[0040] Figure 2 It is Figure 1 It is an enlarged view of part A.

[0041] Explanation of reference signs:

[0042] 1, valve body; 2, medium passage; 3, butterfly plate; 4, pressure relief through hole; 401, sealing cavity; 402, sliding cavity; 403, fixed cavity; 5, rotating block; 6, valve rod; 7, sealing cover; 8, reset elastic force assembly; 801, second elastic member; 802, guide member; 9, sealing seat; 901, first sealing part; 902, second sealing part; 10, first through hole; 11, sealing structure; 1101, graphite ring; 1102, O-ring; 12, first elastic member; 13, fixed block; 14, second through hole; 15, annular protrusion; 16, first annular groove; 17, second annular groove; 18, guide groove; 19, connecting through hole; 20, first fixed groove; 21, second fixed groove; 22, fixed key; 23, arc surface. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0044] The following will be described in combination withFigure 1 and Figure 2 Embodiments of the present application are described.

[0045] According to embodiments of the present application, a pressure relief butterfly valve is provided, comprising a valve body 1, a butterfly plate 3, a rotating block 5 and a reset elastic force assembly 8.

[0046] Specifically, the valve body 1 has a medium passage 2. The butterfly plate 3 is rotatably arranged in the medium passage 2, and the butterfly plate 3 is provided with a pressure relief through hole 4. The rotating block 5 is sleeved on the valve rod 6, and the rotating block 5 is tightly matched with the valve rod 6. The rotating block 5 is located on one side of the butterfly plate 3, and the rotating block 5 is provided with a sealing cover 7. In the sealing state, the sealing cover 7 is tightly matched with the pressure relief through hole 4. In the pressure relief state, the sealing cover 7 is separated from the pressure relief through hole 4. The valve rod 6 is used to drive the rotating block 5 to move, so as to switch the rotating block 5 from the sealing state to the pressure relief state. The reset elastic force assembly 8 is used to provide elastic driving force for switching the rotating block 5 from the pressure relief state to the sealing state.

[0047] In the present embodiment, the butterfly plate 3 is rotatably arranged in the medium passage 2 to complete the opening or closing of the medium passage 2 to control the medium flow or cut-off. The rotating block 5 is arranged on one side of the butterfly plate 3, and the rotating block 5 is fixedly arranged on the valve rod 6. When the valve rod 6 rotates, the rotating block 5 can be driven to rotate. When the rotating block 5 rotates, one end of the rotating block 5 abuts against the butterfly plate 3, thereby providing a pushing force to the butterfly plate 3 to make the butterfly plate 3 rotate. The butterfly plate 3 can divide the medium passage 2 into two cavities, one of which is in communication with the inlet of the valve body 1, and the other of which is in communication with the outlet of the valve body 1. The butterfly plate 3 is provided with a pressure relief through hole 4, which can communicate the two cavities. The medium can enter the other cavity through the pressure relief through hole 4, thereby completing pressure relief and reducing the torque required when the valve is opened. The rotating block 5 is provided with a sealing cover 7 on one side of the butterfly plate 3. In the sealing state, the sealing cover 7 abuts against one end of the pressure relief through hole 4 to close the pressure relief through hole 4. In the process of switching from the sealing state to the pressure relief state, the valve rod 6 is rotated in a first direction. The other side of the rotating block 5 is rotated in a direction close to the butterfly plate 3 and abuts against the butterfly plate 3 to drive the butterfly plate 3 to rotate. The sealing cover 7 rotates with the rotating block 5, thereby separating from the pressure relief through hole 4. The medium can enter the other cavity through the pressure relief through hole 4. When the sealing cover 7 separates from the pressure relief through hole 4, the pressure relief state is entered. When the rotating force driving the rotating block 5 disappears, the reset elastic force assembly 8 provides elastic driving force to the rotating block 5 to reset the rotating block 5, and the sealing cover 7 abuts against one end of the pressure relief through hole 4 again. When it is needed to cut off the medium, the valve rod 6 is rotated in a second direction. The side of the rotating block 5 provided with the sealing cover 7 abuts against the butterfly plate 3 to drive the butterfly plate 3 to rotate, so as to close the medium passage 2. The rotation directions of the first direction and the second direction are opposite.

[0048] It should be noted that by setting the pressure relief through hole 4, and setting the sealing cover 7 on the rotating block 5, in the sealed state, the sealing cover 7 is tightly matched with the pressure relief through hole 4 to achieve normal cutting of the medium; in the pressure relief state, the sealing cover 7 is separated from the pressure relief through hole 4, and the medium can flow through the pressure relief through hole 4, thereby reducing the torque required when the valve is opened, avoiding the problem of valve vibration and wear caused by medium force, and improving the reliability and safety of the valve. Secondly, the design of the reset elastic force assembly 8 enables the rotating block 5 to automatically reset when switching from the pressure relief state to the sealed state, without the need for additional operations, simplifying the operation process and improving work efficiency.

[0049] In one embodiment, the pressure relief through hole 4 has a sealing seat 9, the sealing seat 9 has a first through hole 10, the sealing seat 9 and the inner wall of the pressure relief through hole 4 have a sealing structure 11, the pressure relief through hole 4 has a first elastic member 12, the first elastic member 12 provides the sealing seat 9 with an elastic driving force moving towards the sealing cover 7, and under the elastic driving force, the first elastic member 12 tightly matches the sealing seat 9 with the sealing cover 7 to seal the first through hole 10.

[0050] Specifically, as shown in Figure 2 the two cavities are communicated through the first through hole 10, the sealing seat 9 is movably arranged in the pressure relief through hole 4, the sealing seat 9 and the inner wall of the pressure relief through hole 4 have a sealing structure 11, so that the medium can only flow into the other cavity from the first through hole 10, the pressure relief through hole 4 has a first elastic member 12, the first elastic member 12 can provide the sealing seat 9 with an elastic driving force, in the sealed state, the first elastic member 12 drives the sealing seat 9 to move towards the sealing cover 7, the sealing seat 9 is tightly matched with the sealing cover 7 under the action of the elastic force of the first elastic member 12, the first elastic member 12 and the sealing cover 7 cooperate with each other to provide the sealing seat 9 with an elastic force and a pressure, and then seal the first through hole 10.

[0051] Preferably, the first elastic member 12 is a disc spring.

[0052] Further, the end of the first through hole 10 towards the sealing cover 7 is a gradually widening type opening, which can reduce the erosion and wear of the fluid on the edge of the pipeline inlet, while ensuring that the fluid entering the pipeline has a more uniform velocity distribution.

[0053] The first elastic member 12 provides the sealing seat 9 with a continuous elastic driving force, ensuring the tight cooperation between the sealing seat 9 and the sealing cover 7, effectively preventing the leakage of the medium, and improving the sealing performance of the valve. Further, the sealing structure 11 between the sealing seat 9 and the inner wall of the pressure relief through hole 4 further enhances the sealing effect of the valve, so that the medium can only flow between the cavities through the first through hole 10, avoiding leakage of the medium. This design structure is compact, easy to operate, easy to maintain and replace the sealing member, and reduces the use cost.

[0054] In one embodiment, the pressure relief through hole 4 is provided with a sealing cavity 401, a sliding cavity 402, and a fixed cavity 403. The sealing cavity 401 is located at one end of the pressure relief through hole 4 near the sealing cover 7, the fixed cavity 403 is located at one end of the pressure relief through hole 4 away from the sealing cover 7, the sliding cavity 402 is located between the sealing cavity 401 and the fixed cavity 403, and the sealing cavity 401, the sliding cavity 402, and the fixed cavity 403 are interconnected. The sealing seat 9 is slidably disposed in the sliding cavity 402, and a fixing block 13 is fixedly disposed in the fixed cavity 403. The fixing block 13 has a second through hole 14 that communicates with the first through hole 10. The first elastic member 12 is disposed between the fixing block 13 and the sealing seat 9. In the sealed state, the sealing cover 7 is located in the sealing cavity 401 and is tightly fitted with the sealing seat 9.

[0055] Specifically, such as Figure 2 As shown, the sealing cavity 401 is located above the sliding cavity 402, and the fixed cavity 403 is located below the sliding cavity 402. The sealing cavity 401, the sliding cavity 402, and the fixed cavity 403 are interconnected. The sealing seat 9 can move along the guiding direction of the sliding cavity 402. There is a cavity between the sealing seat 9 and the fixed block 13. The first elastic member 12 is located in the cavity. The fixed block 13 can provide support force for the first elastic member 12. In the sealed state, the sealing cover 7 can extend into the sealing cavity 401 and fit tightly with the sealing seat 9. In the depressurized state, the medium can enter the cavity through the first through hole 10 and enter the second through hole 14 from the cavity, and then flow into another cavity along the second through hole 14.

[0056] By separately setting up a sealing cavity 401, a sliding cavity 402, and a fixed cavity 403, the sealing seat 9 can slide stably in the sliding cavity 402, while ensuring the tight fit between the sealing seat 9 and the sealing cover 7 in the sealed state. The setting of the fixed block 13 not only provides stable support for the first elastic member 12, but also ensures the smooth flow of the medium in the depressurized state through the connection between the second through hole 14 and the first through hole 10.

[0057] In one embodiment, there is an annular protrusion 15 between the sealing cavity 401 and the sliding cavity 402. The sealing seat 9 includes a first sealing part 901 and a second sealing part 902. The outer diameter of the first sealing part 901 is smaller than that of the second sealing part 902. The first sealing part 901 extends into the sealing cavity 401 through the annular protrusion 15. The annular protrusion 15 is used to limit the second sealing part 902.

[0058] Specifically, such as Figure 2 As shown, the annular protrusion 15 can limit the second sealing part 902 to prevent it from falling out of the sliding cavity 402. The first sealing part 901 can pass through the annular protrusion 15 and enter the sealing cavity 401. The first sealing part 901 can fit tightly with the sealing cover 7 in the sealing cavity 401.

[0059] The limiting effect of the annular protrusion 15 ensures the stable position of the sealing seat 9 in the pressure relief through hole 4, and at the same time, the first sealing part 901 extends into the sealing cavity 401 through the annular protrusion 15, thereby increasing the contact area with the sealing cover 7 and improving the reliability and stability of the sealing.

[0060] In one embodiment, the sealing structure 11 comprises a graphite ring 1101 and an O-ring 1102, and the graphite ring 1101 and the O-ring 1102 are arranged in a spaced manner, and the graphite ring 1101 is arranged on the side of the O-ring 1102 close to the sealing cover 7.

[0061] Specifically, as shown in Figure 2 the graphite ring 1101 is arranged above the O-ring 1102. The graphite ring 1101 has excellent wear resistance and can effectively resist the erosion and wear of the medium, thereby prolonging the service life of the sealing structure 11. The O-ring 1102 has good elasticity and sealing performance, which can ensure the close fit between the sealing seat 9 and the inner wall of the pressure relief through hole 4, and effectively prevent the leakage of the medium. The combination of the graphite ring 1101 and the O-ring 1102 not only improves the sealing performance of the valve, but also enhances the durability and reliability of the valve.

[0062] In one embodiment, the outer wall of the sealing seat 9 is provided with a first annular groove 16 and a second annular groove 17, and the graphite ring 1101 and the O-ring 1102 are arranged in the first annular groove 16 and the second annular groove 17, respectively.

[0063] Specifically, as shown in Figure 2 the first annular groove 16 and the second annular groove 17 provide stable mounting positions for the graphite ring 1101 and the O-ring 1102, thereby ensuring the firmness and stability of the sealing structure 11 in the pressure relief through hole 4. The graphite ring 1101 and the O-ring 1102 are respectively embedded in the first annular groove 16 and the second annular groove 17, and tightly fit with the outer wall of the sealing seat 9, thereby effectively preventing the leakage of the medium through the gap between the sealing seat 9 and the inner wall of the pressure relief through hole 4, and further improving the sealing effect of the valve.

[0064] In one embodiment, the sealing cover 7 is arranged on one side of the rotating block 5, and the reset spring assembly 8 is arranged on the other side of the rotating block 5. The reset spring assembly 8 comprises a second elastic member 801, and the two ends of the second elastic member 801 are respectively connected with the rotating block 5 and the butterfly plate 3.

[0065] Specifically, as shown in Figure 1The second elastic member 801 provides elastic driving force for the rotating block 5, so that the rotating block 5 can be automatically reset when switching from the pressure relief state to the sealing state. One end of the second elastic member 801 is fixedly connected with the rotating block 5, and the other end is connected with the butterfly plate 3. When the rotating block 5 is rotated under the action of external force, the second elastic member 801 will be deformed and store elastic potential energy. When the external force disappears, the second elastic member 801 releases the elastic potential energy to drive the rotating block 5 to reset.

[0066] Preferably, the second elastic member 801 is a columnar spring.

[0067] By arranging the second elastic member 801, the two ends of the second elastic member 801 are connected with the rotating block 5 and the butterfly plate 3 respectively, which ensures that the rotating block 5 can be automatically reset when switching from the pressure relief state to the sealing state, without the need for additional operations, further simplifying the operation process and improving the work efficiency. The design of the second elastic member 801 enables the rotating block 5 to automatically return to the initial position after being rotated under the action of external force, thereby ensuring the stability and reliability of the valve.

[0068] In one embodiment, the butterfly plate 3 is provided with a guide groove 18, one end of the second elastic member 801 is connected with the bottom of the guide groove 18, and the reset elastic assembly 8 further comprises a guide member 802 fixedly arranged on the rotating block 5, and the other end of the second elastic member 801 is sleeved on the guide member 802.

[0069] Specifically, as shown in Figure 1 The arrangement of the guide groove 18 provides a certain guiding and limiting effect for the second elastic member 801, so that the second elastic member 801 can remain stable during the stretching and retracting process and is not easy to deviate or twist, thereby ensuring the accuracy and reliability of the reset of the rotating block 5. The guide member 802 is fixedly arranged on the rotating block 5, and the other end of the second elastic member 801 is sleeved on the guide member 802. The design of the guide member 802 further enhances the stability and directivity of the second elastic member 801, so that the second elastic member 801 can be more smooth during the stretching and retracting process and is not easy to be disturbed by external factors. Through the cooperation of the guide groove 18 and the guide member 802, the automatic reset of the rotating block 5 when switching from the pressure relief state to the sealing state is realized, and the reset process is stable and reliable, further improving the work efficiency and reliability of the valve.

[0070] In one embodiment, the rotating block 5 has a connecting through hole 19, the inner wall of the connecting through hole 19 has a first fixing groove 20, the valve rod 6 is provided with a second fixing groove 21 matched with the first fixing groove 20, the rotating block 5 is sleeved on the valve rod 6 through the connecting through hole 19, and a fixing key 22 is inserted into the first fixing groove 20 and the second fixing groove 21 to fixedly connect the rotating block 5 with the valve rod 6.

[0071] Specifically, as shown in Figure 1As shown, the inner wall of the connecting through hole 19 is provided with a first fixing groove 20, and the outer wall of the valve rod 6 is correspondingly provided with a second fixing groove 21 matched with the first fixing groove 20. When the rotating block 5 is sleeved on the valve rod 6 through the connecting through hole 19, the first fixing groove 20 is aligned with the second fixing groove 21. At this time, the fixing key 22 is inserted into the first fixing groove 20 and the second fixing groove 21, so that the rotating block 5 and the valve rod 6 are fixedly connected, and the rotating block 5 is prevented from rotating on the valve rod 6. By arranging the first fixing groove 20, the second fixing groove 21 and the fixing key 22, the rotating block 5 and the valve rod 6 are convenient to install and disassemble, and the working efficiency is improved.

[0072] Preferably, the fixing key 22 is made of elastic material and has a certain elasticity and reset ability. When it is needed to disassemble the rotating block 5 from the valve rod 6, the fixing key 22 can be pulled out outward, so that the fixing key 22 is detached from the first fixing groove 20 and the second fixing groove 21, and the fixed connection between the rotating block 5 and the valve rod 6 is released. Therefore, the rotating block 5 or the valve rod 6 can be replaced or maintained conveniently.

[0073] Further, the rotating block 5 is fixedly connected with the valve rod 6 through a fastener (not shown). Preferably, the fastener is a screw. The rotating block 5 and the valve rod 6 are fixedly connected through the fixing key 22 and the fastener.

[0074] In an embodiment, one side of the rotating block 5 facing the butterfly plate 3 is arc-shaped, and the side of the butterfly plate 3 facing the rotating block 5 is constructed as an arc-shaped surface 23. The arc-shaped surface 23 and the butterfly plate 3 have an avoiding position therebetween.

[0075] Specifically, as shown in the drawings, Figure 1 the side of the rotating block 5 facing the butterfly plate 3 is arc-shaped and matched with the arc-shaped surface 23 of the butterfly plate 3 facing the rotating block 5. The diameter of the arc-shaped surface 23 is greater than that of the arc-shaped rotating block 5. The avoiding position between the arc-shaped surface 23 and the rotating block 5 can also avoid interference or jamming phenomenon during the rotation of the rotating block 5, so that the rotating block 5 rotates more smoothly. In addition, the arc-shaped design can also reduce the erosion of the medium to the rotating block 5 and the butterfly plate 3, thereby prolonging the service life of the valve. During the rotation of the rotating block 5, the cooperation of the arc-shaped surface 23 and the avoiding position enables the rotating block 5 to smoothly drive the butterfly plate 3 to rotate, thereby realizing the opening or closing operation of the medium passage 2.

[0076] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A pressure relief butterfly valve, characterized in that, include: Valve body (1), the valve body (1) having a medium passage (2); The butterfly plate (3) is rotatably disposed in the medium channel (2), and the butterfly plate (3) is provided with a pressure relief through hole (4); A rotating block (5) is sleeved on a valve stem (6). The rotating block (5) is in close contact with the valve stem (6). The rotating block (5) is located on one side of the butterfly plate (3). A sealing cover (7) is provided on the rotating block (5). In the sealed state, the sealing cover (7) is in close contact with the pressure relief hole (4). In the pressure relief state, the sealing cover (7) is separated from the pressure relief hole (4). The valve stem (6) is used to drive the rotating block (5) to move so that the rotating block (5) switches from the sealed state to the pressure relief state. The reset elastic component (8) is used to provide the elastic driving force for the rotating block (5) to switch from the depressurized state to the sealed state.

2. The pressure relief butterfly valve according to claim 1, characterized in that, The pressure relief through hole (4) has a sealing seat (9), the sealing seat (9) has a first through hole (10), the sealing seat (9) and the inner wall of the pressure relief through hole (4) have a sealing structure (11), the pressure relief through hole (4) has a first elastic member (12), the first elastic member (12) provides the sealing seat (9) with an elastic driving force to move toward the sealing cover (7), under the elastic driving force, the first elastic member (12) makes the sealing seat (9) and the sealing cover (7) fit tightly to seal the first through hole (10).

3. The pressure relief butterfly valve according to claim 2, characterized in that, The pressure relief through hole (4) is provided with a sealing cavity (401), a sliding cavity (402), and a fixed cavity (403). The sealing cavity (401) is located at one end of the pressure relief through hole (4) near the sealing cover (7). The fixed cavity (403) is located at one end of the pressure relief through hole (4) away from the sealing cover (7). The sliding cavity (402) is located between the sealing cavity (401) and the fixed cavity (403). The sealing cavity (401), the sliding cavity (402), and the fixed cavity (403) are connected in a series. 403) They are interconnected. The sealing seat (9) is slidably disposed in the sliding cavity (402). A fixing block (13) is fixedly disposed in the fixing cavity (403). A second through hole (14) communicating with the first through hole (10) is opened on the fixing block (13). The first elastic member (12) is disposed between the fixing block (13) and the sealing seat (9). In the sealed state, the sealing cover (7) is located in the sealing cavity (401) and tightly cooperates with the sealing seat (9).

4. The pressure relief butterfly valve according to claim 3, characterized in that, There is an annular protrusion (15) between the sealing cavity (401) and the sliding cavity (402). The sealing seat (9) includes a first sealing part (901) and a second sealing part (902). The outer diameter of the first sealing part (901) is smaller than that of the second sealing part (902). The first sealing part (901) extends into the sealing cavity (401) through the annular protrusion (15). The annular protrusion (15) is used to limit the second sealing part (902).

5. The pressure relief butterfly valve according to any one of claims 2 to 4, characterized in that, The sealing structure (11) includes a graphite ring (1101) and an O-ring (1102), the graphite ring (1101) and the O-ring (1102) are spaced apart, and the graphite ring (1101) is located on the side of the O-ring (1102) close to the sealing cover (7).

6. The pressure relief butterfly valve according to claim 5, characterized in that, The outer wall of the sealing seat (9) is provided with a first annular groove (16) and a second annular groove (17), and the graphite ring (1101) and the O-ring (1102) are respectively disposed in the first annular groove (16) and the second annular groove (17).

7. The pressure relief butterfly valve according to claim 1, characterized in that, The sealing cover (7) is disposed on one side of the rotating block (5), and the reset elastic assembly (8) is disposed on the other side of the rotating block (5). The reset elastic assembly (8) includes a second elastic member (801), and the two ends of the second elastic member (801) are respectively connected to the rotating block (5) and the butterfly plate (3).

8. The pressure relief butterfly valve according to claim 7, characterized in that, The butterfly plate (3) is provided with a guide groove (18). One end of the second elastic member (801) is connected to the bottom of the guide groove (18). The reset elastic assembly (8) also includes a guide member (802). The guide member (802) is fixedly mounted on the rotating block (5). The other end of the second elastic member (801) is sleeved on the guide member (802).

9. The pressure relief butterfly valve according to claim 1, characterized in that, The rotating block (5) has a connecting through hole (19), the inner wall of the connecting through hole (19) has a first fixing groove (20), the valve stem (6) has a second fixing groove (21) that matches the first fixing groove (20), the rotating block (5) is sleeved on the valve stem (6) through the connecting through hole (19), and the fixing key (22) is inserted in the first fixing groove (20) and the second fixing groove (21) so that the rotating block (5) is fixedly connected to the valve stem (6).

10. The pressure relief butterfly valve according to claim 1, characterized in that, The rotating block (5) is arc-shaped on the side facing the butterfly plate (3), and the side of the butterfly plate (3) facing the rotating block (5) is constructed as an arc-shaped surface (23), with a clearance between the arc-shaped surface (23) and the butterfly plate (3).

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