Valve seat

Abstract

The present application discloses a valve seat for installing a safety valve to a pressure vessel or removing the safety valve from the pressure vessel, comprising: a housing, a rotating shaft, a flange, a piston and a transmission mechanism. When the valve seat of the present application utilizes different angular ranges of rotation of the flange, the linkage of the flange, the rotating shaft and the cam enables an operator to install the safety valve to the pressure vessel by only one action of rotating the flange, and automatically connect the passage between the pressure cavity inside the pressure vessel and the safety valve after the installation is completed, or automatically disconnect the passage between the pressure cavity inside the pressure vessel and the safety valve before the safety valve is removed from the pressure vessel, so that the safety valve can be removed from the pressure vessel.

Description

Technical Field

[0001] This application relates to the field of pressure vessels, and particularly to a valve seat for installing a safety valve onto a pressure vessel. Background Art

[0002] Generally, a pressure vessel needs to be provided with a safety valve that is in fluid communication with the pressure chamber inside it. The safety valve is normally in a closed state during normal operation. When the medium pressure inside the pressure vessel is too high and exceeds the threshold of the safety valve, the safety valve will automatically open, discharging the medium to the outside to reduce the pressure inside the pressure vessel, so as to prevent the pressure vessel from being damaged by the medium with too high pressure inside.

[0003] The performance of the safety valve needs to be regularly inspected. When disassembling the safety valve, it is necessary to first close the passage between the pressure chamber of the pressure vessel and the safety valve. After the inspection is completed, the safety valve needs to be installed onto the pressure vessel, and then the passage between the pressure chamber of the pressure vessel and the safety valve is opened. Summary of the Invention

[0004] This application provides a valve seat for installing a safety valve onto a pressure vessel or removing the safety valve from the pressure vessel, comprising: a housing, a rotating shaft, a flange, a piston, and a transmission mechanism. A pressure fluid passage is provided inside the housing, and the safety valve and the pressure vessel are in fluid communication through the pressure fluid passage. The rotating shaft is rotatably provided inside the housing. The top of the flange is used to connect to the safety valve, and a flange passage is provided in the flange. The flange passage fluidly connects the pressure fluid passage and the safety valve, wherein the flange is configured to be able to rotate in a first direction to be installed onto the housing, or rotate in a second direction to be removed from the housing, and the bottom of the flange engages with the rotating shaft, such that the rotation of the flange drives the rotating shaft to rotate together. The piston is provided in the housing, and the piston has an open position and a closed position. The piston opens the pressure fluid passage in the open position and closes the pressure fluid passage in the closed position, wherein the piston is configured to be able to move between the open position and the closed position. The transmission mechanism is drivingly connected to the rotating shaft and the piston, and the transmission mechanism is configured to be able to convert the rotational motion of the rotating shaft into the motion of the piston. Wherein, the valve seat is configured such that as the flange and the rotating shaft rotate together in the first direction, the flange is first installed onto the housing, and then the transmission mechanism drives the piston to move to the open position; and as the flange and the rotating shaft rotate together in the second direction, the transmission mechanism first drives the piston to move to the closed position, and then the flange is removed from the housing.

[0005] According to the above, the transmission mechanism includes: a cam and a follower. The cam is sleeved outside the rotating shaft, and the rotating shaft drives the cam to rotate. The follower cooperates with the cam and is connected to the piston to drive the piston to perform linear motion through the rotation of the cam.

[0006] According to the above, the flange and the rotating shaft have a first angular range, a second angular range, and a third angular range. The transmission mechanism is configured such that: when the flange and the rotating shaft rotate within the first angular range, the follower is in the near stop stroke; when the flange and the rotating shaft rotate in the second angular range along a first direction, the cam drives the follower to be in the lift stroke, the cam drives the piston to move to the open position, and when the flange and the rotating shaft rotate in the second angular range along a second direction, the cam drives the follower to be in the return stroke, the cam drives the piston to move to the closed position; and when the flange and the rotating shaft rotate within the third angular range, the cam is in the far stop stroke.

[0007] According to the above, the follower includes a frame and at least one connecting rod. The cam is connected within the frame, and the edge of the cam contacts the frame. The at least one connecting rod rigidly connects the frame and the piston. The cam is arranged such that: when the follower is in the lift stroke or the return stroke, the cam drives the piston to perform linear motion by driving the frame to move; and when the cam is in the near stop stroke or the far stop stroke, the cam does not drive the frame to move.

[0008] According to the above, the transmission mechanism further includes a pair of support seats. The pair of support seats are arranged within the housing and connected to the bottom of the housing. Each support seat includes a limiting hole for the connecting rod to pass through. The at least one connecting rod includes a pair of connecting rods. One end of each connecting rod in the pair of connecting rods is connected to the frame, and the other end passes through the limiting hole to be supported on the support seat. Wherein, the support seat is configured to limit the movement direction of the connecting rod, thereby limiting the movement direction of the piston.

[0009] According to the above, the valve seat further includes a hollow-shaped connecting seat. The connecting seat is fixedly connected to the top of the housing. The flange is mounted to the housing by connecting to the top of the connecting seat, and at least a part of the flange passes through the connecting seat to engage with the rotating shaft within the housing.

[0010] According to the above, the valve seat further includes a locking mechanism. The flange has an initial position and a locking position, and the flange reaches the locking position after rotating through the first angular range, the second angular range, and the third angular range from the initial position. The flange is configured such that when the flange and the rotating shaft rotate within the first angular range from the initial position, the flange rotates and descends relative to the connecting seat to be mounted to the connecting seat in a pressing manner. When the flange and the rotating shaft rotate within the second angular range and the third angular range, the flange rotates relative to the connecting seat. And when the flange rotates to reach the locking position, the locking mechanism can lock and connect the flange to the connecting seat.

[0011] According to the above, the locking mechanism includes at least one turnbuckle bolt and at least one nut, and the at least one turnbuckle bolt is pivotally connected to the connecting seat. The flange has at least one notch. The locking mechanism is configured such that when the flange reaches the locking position, the turnbuckle bolt can pass through the notch, and the flange is locked and connected to the connecting seat by the nut.

[0012] According to the above, the connecting seat includes a hollow connecting sleeve and an annular flange formed by extending outward from the top edge of the connecting sleeve. The flange includes a disc, a hollow flange sleeve, and at least one leg. The disc surrounds the flange sleeve. The top of the flange sleeve is used to mount the safety valve. The flange channel is provided in the flange sleeve. The at least one leg extends downward from the lower surface of the disc, and the distal end of each leg has a claw portion extending inward, wherein the flange is arranged such that when the flange rotates, the disc abuts against the upper surface of the annular flange, and the claw portion hooks the annular flange and moves along the lower surface of the annular flange.

[0013] According to the above, the annular flange includes at least one groove portion, at least one limiting portion and at least one guiding portion in the circumferential direction. The at least one guiding portion is disposed on one side of the groove portion in the first direction, and the at least one limiting portion is disposed on one side of the groove portion in the second direction. Wherein, the at least one groove portion is formed by radially recessing from the outer surface of the annular flange, and the at least one groove portion is configured such that when the flange is in the initial position, the leg portion of the flange is aligned with the groove portion, and the claw portion is at least partially received in the groove portion. The lower surface of the at least one guiding portion extends obliquely downward from the groove portion in the first direction, so that when the flange rotates from the initial position in the first direction within the first angular range, the claw portion moves along the lower surface of the guiding portion, so that the flange rotates and descends relative to the connecting seat. The at least one limiting portion protrudes downward from the lower surface of the annular flange, and the at least one limiting portion is configured such that when the flange is in the locked position, the at least one limiting portion blocks the leg portion of the flange in the first direction to limit the rotation of the flange.

[0014] According to the above, a roller is provided on the top of the claw portion, and the roller is arranged to abut against the lower surface of the annular flange to facilitate the rotation of the flange relative to the connecting seat.

[0015] According to the above, the bottom of the flange sleeve has a first tooth portion, and the top of the rotating shaft has a second tooth portion. The first tooth portion and the second tooth portion are engaged so that the flange and the rotating shaft can rotate together. Wherein, the heights of the first tooth portion and the second tooth portion are different so that an inter-tooth opening can be formed between the first tooth portion and the second tooth portion, and the inter-tooth opening is configured to fluidly connect the pressure fluid passage and the flange passage of the flange.

[0016] According to the above, the housing defines a piston chamber, a connection chamber and a transmission mechanism chamber. The piston is disposed in the piston chamber, the transmission mechanism is disposed in the transmission mechanism chamber, and the connection chamber fluidly connects the pressure fluid passage and the flange passage of the flange. Wherein, the inlet of the pressure fluid passage is used to fluidly connect with the pressure vessel, the pressure fluid passage extends through the piston chamber, and the outlet of the pressure fluid passage is fluidly connected with the flange passage of the flange through the connection chamber, so that the pressure fluid passage fluidly connects the safety valve and the pressure vessel. Wherein the pressure fluid passage includes several branch passages arranged side by side, and the branch passages form several piston chamber openings on the chamber wall defining the piston chamber. The piston is configured to block the piston chamber openings when in the closed position, thereby closing the pressure fluid passage.

[0017] According to the above, the housing includes a top wall, a bottom wall, and four side walls that are arranged around the cavity of the transmission mechanism and are interconnected. Among them, the piston cavity is provided in one of the four side walls, and the connection cavity is provided in the top wall. Among them, the branch channels form several branch inlets on the bottom wall and several branch outlets on the top wall. The valve seat further includes an adapter and a distributor. The distributor is connected between the branch inlet and the adapter. The distributor is in the shape of a box with an open top. The pressure vessel is in fluid communication with the branch inlet through the adapter and the distributor. The connection seat is connected above the top wall to mount the safety valve and the flange above the top wall.

[0018] According to the above, the sum of the cross-sectional areas of the several branch inlets, the sum of the cross-sectional areas of the several branch outlets, and the sum of the cross-sectional areas of the openings of the several piston cavities are equal, and are equal to the cross-sectional area of the medium inlet of the safety valve and the cross-sectional area of the medium outlet of the pressure vessel.

[0019] Other features, advantages, and embodiments of the present application can be elaborated or become apparent by considering the following detailed description, drawings, and claims. In addition, it should be understood that the above summary of the invention and the following detailed description are both exemplary and are intended to provide further explanation without limiting the scope of the present application claimed. However, the detailed description and specific examples only indicate the preferred embodiments of the present application. Various changes and modifications within the spirit and scope of the present application will be apparent to those skilled in the art through this detailed description. Description of the Drawings

[0020] Figure 1A Is a three-dimensional structure diagram of a valve seat according to an embodiment of the present application;

[0021] Figure 1B Is Figure 1A A three-dimensional structure diagram of the valve seat shown with the front cover removed;

[0022] Figure 1C Is Figure 1A An exploded view of the valve seat shown;

[0023] Figure 2A Is Figure 1A A three-dimensional structure diagram of the housing in

[0024] Figure 2B Is Figure 2A A top view of the housing shown;

[0025] Figure 2C Is Figure 2BCross-sectional view of the shown housing along line A-A;

[0026] Figure 2D is Figure 2C Cross-sectional view of the shown housing along line B-B;

[0027] Figure 3A is Figure 1A Stereoscopic structure diagram of the connecting seat in;

[0028] Figure 3B is Figure 3A Front view of the shown connecting seat;

[0029] Figure 4A is Figure 1A Stereoscopic structure diagram of the flange in;

[0030] Figure 4B is Figure 4A Bottom view of the shown flange;

[0031] Figure 4C is Figure 4B Cross-sectional view of the shown flange along line C-C;

[0032] Figure 5A is Figure 1A Stereoscopic structure diagram of the rotating shaft, transmission mechanism and piston in;

[0033] Figure 5B is Figure 5A Exploded view of;

[0034] Figure 5C is Figure 5A Top view of the transmission mechanism in;

[0035] Figure 6A - Figure 6D Structure diagram showing the valve seat in the first state;

[0036] Figure 7A - Figure 7D Structure diagram showing the valve seat in the second state;

[0037] Figure 8A - Figure 8D Structure diagram showing the valve seat in the third state;

[0038] Figure 9A - Figure 9D Structure diagram showing the valve seat in the fourth state;

[0039] Figure 10A - Figure 10D Structure diagram showing the valve seat in the fifth state. Detailed implementation method

[0040] The following will describe various specific embodiments of the present application with reference to the accompanying drawings that form a part of this specification. It should be understood that although terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", "top", "bottom", etc., are used in the present application to describe various example structural parts and elements of the present application, these terms are used herein only for the purpose of convenience of description and are determined based on the example orientations shown in the accompanying drawings. Since the embodiments disclosed in the present application can be arranged in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations.

[0041] Figure 1A - Figure 1C Shows the basic structure of the valve seat 100, where Figure 1A Shows the three-dimensional structure of the valve seat 100, Figure 1B Shows the internal structure of the valve seat 100 after removing the front cover plate 107, Figure 1C Shows the exploded view of the valve seat 100. As Figure 1A - Figure 1B Shown, the valve seat 100 includes a housing 101. The housing 101 is generally in the shape of a hollow rectangular parallelepiped. The front part of the housing 101 has a detachable front cover plate 107, and the right side part of the housing 101 has a detachable right cover plate 106. By removing the front cover plate 107 and the right cover plate 106, the equipment housed inside the housing 101 can be maintained.

[0042] The valve seat 100 further includes a connection seat 105 and a flange 102. The connection seat 105 is arranged above the housing 101 and is fixedly connected to the housing 101. The flange 102 is rotatably and detachably mounted to the connection seat 105 so as to be detachably mounted to the housing 101 through the connection seat 105. The flange 102 has an initial position and a locked position, and the flange 102 has a first angular range, a second angular range, and a third angular range. When the flange 102 rotates from the initial position in a first direction, it passes through the first angular range, the second angular range, and the third angular range in sequence and then reaches the locked position, and the flange 102 is mounted to the connection seat 105. When the flange 102 rotates from the locked position in a second direction and reaches the initial position after passing through the third angular range, the second angular range, and the first angular range in sequence, the flange 102 is detached from the connection seat 105. In the present application, the flange 102 is used to mount a safety valve (not shown in the figure). By detachably mounting the flange 102 to the housing 101, the safety valve can be synchronously and detachably mounted to the housing 101. As an example, the safety valve is mounted above the flange 102. The valve seat 100 further includes a locking mechanism 104, and the locking mechanism 104 is used to lock the connection between the flange 102 and the connection seat 105 when the flange 102 is in the locked position.

[0043] The valve seat 100 further includes an adapter 108, a distributor 111, and a bracket 109. The adapter 108 and the distributor 111 are disposed at the lower left of the housing 101, and the bracket 109 is symmetrically disposed at the lower right of the housing 101. In the present application, the adapter 108 is used to mount a pressure vessel (not shown in the figure). As an example, the pressure vessel is mounted below the adapter 108.

[0044] The valve seat 100 further includes a rotating shaft 128, a transmission mechanism 120, and a piston 110. The transmission mechanism 120 is drivingly connected to the rotating shaft 128 and the piston 110. The piston 110 and the transmission mechanism 120 are disposed inside the housing 101. The piston 110 is connected to the left end of the transmission mechanism 120, and the piston 110 has a closed position extending to the left and an open position retracting to the right. The transmission mechanism 120 is capable of driving the piston 110 to perform a linear reciprocating motion between the open position and the closed position. The rotating shaft 128 extends longitudinally through the housing 101, wherein the bottom of the rotating shaft 128 is supported and connected to the bottom of the housing 101, the top of the rotating shaft 128 engages with the flange 102, and the middle of the rotating shaft 128 engages with the transmission mechanism 120. Thus, the rotating shaft 128 can rotate together with the flange 102, and the rotation of the rotating shaft 128 can drive the piston 110 to move through the transmission mechanism 120.

[0045] Further in combination with Figure 1A - Figure 1C As shown, more specifically, the housing 101 has a transmission mechanism cavity 131, a piston cavity 132, and a connection cavity 133. The connection cavity 133 is located above the transmission mechanism cavity 131, and the piston cavity 132 is located on the left side of the transmission mechanism cavity 131. The transmission mechanism cavity 131 is used to accommodate the transmission mechanism 120, and the piston cavity 132 is used to accommodate the piston 110. The connection cavity 133 is used to accommodate the engagement of the top of the rotating shaft 128 and the bottom of the flange 102 therein. The housing 101 further includes a pressure fluid passage 218 for fluidly connecting the safety valve and the pressure vessel (see Figure 2C As shown), and the piston cavity 132 and the connection cavity 133 are fluidly connected through the pressure fluid passage 218 inside the housing 101. And neither the piston cavity 132 nor the connection cavity 133 is fluidly connected to the transmission mechanism cavity 131. As a specific example, a sealing ring 124 is sleeved on the rotating shaft 128 to seal off the connection cavity 133 and the transmission mechanism cavity 131. Similarly, a sealing ring 127 is sleeved on the piston 110 to seal off the piston cavity 132 and the transmission mechanism cavity 131. Thus, the piston cavity 132 and the connection cavity 133 form a pressure-bearing cavity, and the transmission mechanism cavity 131 forms a non-pressure-bearing cavity. The front cover plate 107 and the right cover plate 106 are detachably connected to the outside of the non-pressure-bearing cavity.

[0046] The flange 102 includes a disk 141 and a flange sleeve 142 with a hollow shape. The disk 141 is disposed around the flange sleeve 142. The top of the flange sleeve 142 projects out from the top surface of the disk 141 for installing a safety valve. The bottom of the flange sleeve 142 has a first tooth portion 149, and the teeth of the first tooth portion 149 extend downward for engaging with a second tooth portion 129 at the top of the rotating shaft 128. Inside the flange sleeve 142, there is a flange channel 148, and the size of the flange channel 148 is consistent with the size of the medium inlet of the safety valve, so that the flange channel 148 can be used for internal fluid communication with the safety valve. The flange 102 further includes a pair of symmetrically disposed legs 143, and the legs 143 are used to cooperate with the connection seat 105 so that the flange 102 can be rotationally mounted to the connection seat 105.

[0047] The connection seat 105 includes a connection sleeve 152 with a hollow shape and an annular flange 151 formed by extending outward from the top edge of the connection sleeve 152. On the lower surface of the annular flange 151, there is a specific structure (see the groove portion 353, the limiting portion 355, and the guiding portion 354 in Figure 3A ). Each leg 143 of the flange 102 further includes a claw portion 445 that projects inward (see Figure 4A and Figure 4C shown). A sealing ring 115 is provided between the flange 102 and the connection seat 105. When the flange 102 rotates relative to the connection seat 105, the sealing ring 115 is clamped between the disk 141 of the flange 102 and the annular flange 151 of the connection seat 105. And the claw portion 445 of the flange 102 hooks the lower surface of the annular flange 151 and moves along the lower surface of the annular flange 151 as the flange 102 rotates, and cooperates with the specific structure on the lower surface of the annular flange 151.

[0048] The dispenser 111 is in the shape of a square box with an open top. Its top is connected to the housing 101, and its bottom is connected to the adapter 108. Inside the adapter 108, there is an adapter channel 118, and the size of the adapter channel 118 is consistent with the size of the medium outlet of the pressure vessel, so that the adapter channel 118 can be used for fluid communication with the pressure chamber inside the pressure vessel. The dispenser 111 is used to connect the adapter channel 118 with the pressure fluid channel 218 in the housing 101. Its top is set to match the shape of the inlet of the pressure fluid channel 218, and its bottom is set to match the shape of the adapter channel 118. In some embodiments, the valve seat 100 may not include the dispenser 111 either, and directly connect the adapter 108 to the housing 101.

[0049] The transmission mechanism 120 is used to convert the rotational motion of the rotating shaft 128 into the linear motion of the piston 110. In this embodiment, the transmission mechanism 120 includes a cam 126 and a follower. The cam 126 is sleeved outside the rotating shaft 128, and the cam 126 rotates as the rotating shaft 128 rotates. The follower is connected to the piston 110. When the cam 126 rotates, the follower cooperates with the cam 126 to drive the piston 110 to perform linear reciprocating motion. When the piston 110 moves to its closed position, the piston 110 can disconnect or close the pressure fluid passage 218; when the piston 110 moves to its open position, the piston 110 can connect or open the pressure fluid passage 218. In this embodiment, the cam and the follower form an equal-width cam mechanism. The cam 126 is a disk-shaped cam, and the follower includes a rectangular frame 122 and a pair of connecting rods 123. The pair of connecting rods 123 are symmetrically connected to opposite sides of the frame 122. The cam 126 is disposed within the frame 122, and the outer edge of the cam 126 contacts the frame 122 so that the rotation of the cam 126 is converted into the linear motion of the frame 122. The frame 122 and the piston 110 are rigidly connected by a connecting rod 123 so that the movement of the frame 122 can drive the movement of the piston 110. The transmission mechanism 120 further includes a pair of support seats 125. The pair of connecting rods 123 are respectively supported and connected to a corresponding support seat 125. In this embodiment, the support seats 125 are fixedly connected above the bottom of the housing 101. That is, the support seats 125 are stationary, and when the cam 126 rotates, the frame 122, the connecting rods 123, and the piston 110 jointly perform linear reciprocating motion relative to the support seats 125. In some other embodiments, the cam can be of other shapes, and the follower can include other follower components that cooperate with the cam. And in some other embodiments, the transmission mechanism may not be a cam transmission mechanism, but other transmission mechanisms that can convert rotational motion into linear motion, such as a connecting rod transmission mechanism, a worm and worm gear transmission mechanism, a gear transmission mechanism, etc.

[0050] In the valve seat 100 of the present application, the flange 102 and the rotating shaft 128 rotate together. With the joint rotation of the flange 102 and the rotating shaft 128, the valve seat 100 can sequentially complete: when disassembling the safety valve, first complete the operation of disconnecting the connection passage between the safety valve and the pressure vessel, and then complete the operation of disassembling the safety valve; when installing the safety valve, first complete the operation of installing the safety valve, and then complete the operation of connecting the connection passage between the safety valve and the pressure vessel.

[0051] Specifically, during the installation of the flange 102 to the housing 101, the flange 102 and the rotating shaft 128 rotate together in the first direction. When the flange 102 and the rotating shaft 128 rotate within the first angular range, the flange 102 is installed to the housing 101. Then, when the flange 102 and the rotating shaft 128 rotate within the second angular range and the third angular range, the rotating shaft 128 drives the piston 110 to move to the open position through the transmission mechanism 120, so that the adapter passage 118 and the flange passage 148 are connected, thereby fluidly connecting the safety valve and the pressure vessel. During the removal of the flange 102 from the housing 101, the flange 102 and the rotating shaft 128 rotate together in the second direction. When the flange 102 and the rotating shaft 128 rotate within the third angular range and the second angular range, the rotating shaft 128 drives the piston 110 to move to the closed position through the transmission mechanism 120, so that the adapter passage 118 and the flange passage 148 are disconnected, thereby disconnecting the safety valve and the pressure vessel. Then, when the flange 102 and the rotating shaft 128 rotate within the first angular range, the flange 102 is removed from the housing 101.

[0052] Figure 2A - Figure 2D shows the specific structure of the housing 101 with the front cover 107 and the right cover 106 omitted. Among them Figure 2A shows a three-dimensional structure diagram of the housing 101 from the bottom view angle, Figure 2B shows a top view of the housing 101, Figure 2C and Figure 2D respectively show cross-sectional views of the housing 101 along the A-A line and the B-B line. As Figure 2A - Figure 2DAs shown, the housing 101 has a top wall 273 and a bottom wall 274 which are oppositely arranged, and four side walls 275, 276, 277, 278. They are arranged around the transmission mechanism cavity 131 and are interconnected to form a square box body. The four side walls 275, 276, 277, 278 are respectively the left side wall 275 and the right side wall 277 which are oppositely arranged, and the front side wall 278 and the rear side wall 276. In this embodiment, the left side wall 275 has a certain thickness, and the piston cavity 132 is arranged in the left side wall 275. It extends outward from the inner surface of the left side wall 275 but does not penetrate the left side wall 275. The piston cavity 132 is cylindrical in shape, and its axis is consistent with the movement direction of the piston 110. Thus, the piston cavity 132 can communicate with the transmission mechanism cavity 131 inside the left side wall 275 and accommodate the piston 110 to move in the piston cavity 132. And in this embodiment, the top wall 273 also has a certain thickness, and the connection cavity 133 is arranged in the top wall 273. It extends downward from the upper surface of the top wall 273 but does not penetrate the top wall 273. The connection cavity 133 is also cylindrical in shape, and its axis is consistent with the axis of the rotating shaft 128. The bottom of the top wall 273 has a shaft hole 237 for the rotating shaft 128 to pass through. When the rotating shaft 128 passes through the shaft hole 237, the shaft hole 237 is sealed by the sealing ring 124 on the rotating shaft 128. Thus, although the rotating shaft 128 extends from the connection cavity 133 through the top wall 273 into the transmission mechanism cavity 131, the connection cavity 133 does not communicate with the transmission mechanism cavity 131 below the top wall 273.

[0053] The pressure fluid passage 218 is arranged in the left side wall 275 and the top wall 273 of the housing 101. Specifically, the pressure fluid passage 218 extends upward from the connection of the bottom wall 274 and the left side wall 275, passes through the piston cavity 132 and then continues to extend upward to the connection of the left side wall 275 and the top wall 273, and then extends rightward through the top wall 273 into the connection cavity 133. Thus, the piston cavity 132 and the connection cavity 133 can be fluidly connected through the pressure fluid passage 218. The pressure fluid passage 218 forms an inlet 236 of the pressure fluid passage 218 on the bottom wall 274 of the housing 101, and forms an outlet 135 of the pressure fluid passage 218 on the top wall 273 of the housing 101. The inlet 236 of the pressure fluid passage 218 is connected to the distributor 111 below the bottom wall 274 of the housing 101, so that the inlet 236 can be fluidly connected to the pressure cavity inside the pressure vessel through the distributor 111 and the adapter 108. And the outlet 135 of the pressure fluid passage 218 is connected to the flange passage 148 in the flange 102 through the connection cavity 133, so that the outlet 135 can be fluidly connected to the inside of the installed valve through the flange passage 148. Thus, the pressure cavity inside the pressure vessel can be fluidly connected to the inside of the installed valve through the pressure fluid passage 218.

[0054] In this embodiment, the pressure fluid passage 218 includes a plurality of branch passages 238 arranged side by side. The cross-section of each branch passage 238 is circular to reduce the flow resistance of the pressure medium. Each branch passage 238 forms a branch inlet 271 on the bottom wall 274, a branch outlet 272 on the top wall 273, and a piston chamber opening 234 on the left side wall 275 forming the piston chamber 132. As an example, the branch passages 238 are arranged side by side in the front-rear direction. When the piston 110 moves to the closed position in the piston chamber 132, the piston 110 disconnects or closes each branch passage 238 by blocking the piston chamber opening 234, thereby closing the pressure fluid passage 218. When the piston 110 moves to the open position in the piston chamber 132, the piston 110 connects or opens each branch passage 238 by clearing the piston chamber opening 234, thereby opening the pressure fluid passage 218. Those skilled in the art can understand that in order to avoid pressure drop caused by the valve seat 100 when connecting the pressure vessel and the safety valve, the total cross-sectional area of the branch inlets 271, the total cross-sectional area of the branch outlets 272, and the total cross-sectional area of the piston chamber openings 234 are the same, and are all equal to the cross-sectional area of the medium outlet of the pressure vessel and the medium inlet of the safety valve.

[0055] In this embodiment, the piston chamber openings 234 are arranged in a surrounding manner on the wall surface of the piston chamber 132, forming a circle of openings on the circumferential direction of the wall surface of the piston chamber 132. Such an arrangement makes more full use of the wall surface space of the piston chamber 132 compared with the integrally formed pressure fluid passage with a circular cross-section. Therefore, setting the pressure fluid passage 218 as a plurality of branch passages 238 can reduce the diameter of a single branch passage 238 while achieving the same flow area, thereby reducing the stroke of the piston 110 between the closed position and the open position, and further reducing the size required for the cam 126. In other embodiments, the pressure fluid passage 218 can also be set to other structures, as long as the cross-sectional areas of the inlet 236 and the outlet 135 of the pressure fluid passage 218 are equal to the cross-sectional areas of the medium outlet of the pressure vessel and the medium inlet of the safety valve.

[0056] Figure 3A and Figure 3B show the specific structure of the connection seat 105, where Figure 3A shows a three-dimensional structure diagram of the connection seat 105 from a top-down perspective, Figure 3B shows Figure 3A the front view. As Figure 3A and Figure 3BAs shown, the interior of the connecting sleeve 152 of the connecting seat 105 has a cavity 350. The cavity 350 is used to receive the flange sleeve 142 of the flange 102. The top of the annular flange 151 of the connecting seat 105 has an annular groove 316, and the annular groove 316 is used to accommodate the sealing ring 115. Thus, when the flange 102 is installed onto the connecting seat 105, the flange sleeve 142 is inserted into the cavity 350, and the disc 141 is sealingly connected above the annular flange 151 through the sealing ring 115.

[0057] The annular flange 151 of the connecting seat 105 includes a pair of ring bodies 360, a pair of groove portions 353, a pair of guiding portions 354, and a pair of limiting portions 355 in the circumferential direction. The pair of ring bodies 360 are disposed opposite to and spaced apart from each other. The pair of groove portions 353 are respectively disposed between the opposite ends of the pair of ring bodies 360. Each groove portion 353 is formed by the radially outer surface of the annular flange 151 being recessed radially inwards. In this embodiment, the position and number of the groove portions 353 are set to correspond to the position and number of the legs 143 of the flange 102. That is to say, the pair of groove portions 353 are symmetrically disposed on the opposite sides in the circumferential direction of the annular flange 151. The groove portions 353 are used to accommodate at least a part of the legs 143 of the flange 102 when the flange 102 is in the initial position.

[0058] Each guiding portion 354 is disposed on one side of the corresponding groove portion 353 in the first direction. In this embodiment, the guiding portion 354 is connected between the corresponding groove portion 353 and the ring body 360. That is to say, the guiding portion 354 is adjacent to the groove portion 353. And in the first direction, the lower surface of the guiding portion 354 gradually extends downwardly and obliquely. In other words, the lower surface of the guiding portion 354 gradually extends upwardly and obliquely from the ring body 360 in the second direction to be connected to the groove wall of the groove portion 353. The guiding portion 354 is used to guide the rotation and downward movement of the flange 102 when the flange 102 rotates in the first direction, so that the sealing ring 115 is elastically deformed to sealingly connect the flange 102 to the connecting seat 105.

[0059] The limiting portion 355 is disposed at one end of the corresponding ring body 360 in the first direction. In this embodiment, the end wall of the limiting portion 355 in the first direction forms the groove wall of the groove portion 353. That is to say, one side of each limiting portion 355 in the first direction is connected to the groove portion 353, and one side in the second direction is connected to the ring body 360. In other words, one end of each ring body 360 in the first direction is connected to the limiting portion 355, and one end in the second direction is connected to the guiding portion 354. The limiting portion 355 is formed by the lower surface of the annular flange 151 protruding downwardly. The limiting portion 355 is used to block the legs 143 of the flange 102 to limit the flange 102 in its locked position.

[0060] A locking mechanism 104 is connected to the outer wall of the connecting sleeve 152 of the connecting seat 105. The locking mechanism 104 is used to lock the connecting flange 102 and the connecting seat 105 when the flange 102 is in its locked position. In the present embodiment, the locking mechanism 104 includes four support seats 356, four turnbuckles 357, and four nuts 359. The four support seats 356 are fixedly connected to the outer wall of the connecting sleeve 152 at circumferential intervals, and the distal end 317 of each support seat 356 extends radially outward. The four turnbuckles 357 are pivotally connected (i.e., pivoted) to the distal end 317 of a corresponding one of the support seats 356. For example, the rotation axis 358 of each turnbuckle 357 is supported on the corresponding distal end 317. When the flange 102 has not reached the locked position, the turnbuckle 357 rotates relative to the support seat 356 to a substantially lateral position, so that the turnbuckle 357 does not block the rotation of the flange 102. When the flange 102 rotates to the locked position, the notch 144 in the circumferential direction of the disk 141 of the flange 102 is aligned with the turnbuckle 357, and the turnbuckle 357 rotates relative to the support seat 356 to a substantially vertical position to enter the notch 144 of the flange 102, fixing the relative positions of the flange 102 and the connecting seat 105 in the circumferential and radial directions. At this time, the nut 359 can be tightly connected to the turnbuckle 357 to lock the relative positions of the flange 102 and the connecting seat 105 in the axial direction. Those skilled in the art can understand that in other embodiments, the locking mechanism 104 may also include other numbers of support seats 356, turnbuckles 357, and nuts 359, as long as the numbers of the support seats 356, turnbuckles 357, and nuts 359 are correspondingly set.

[0061] Figure 4A - Figure 4C The specific structure of the flange 102 is shown. Among them Figure 4A The perspective view of the flange 102 is shown, Figure 4B The bottom view of the flange 102 is shown, Figure 4C The flange 102 is shown along Figure 4B The cross-sectional view taken along the C-C line in Figure 4A - Figure 4CAs shown, a pair of legs 143 of the flange 102 extend downward from the lower surface of the disc 141 respectively. The distal ends of each leg 143 respectively have claws 445 extending inwardly and oppositely. In this embodiment, the legs 143 extend substantially along the axial direction of the flange 102, and the claws 445 extend substantially along the radial direction of the flange 102. The distance between the pair of legs 143 is slightly larger than the outer diameter of the annular flange 151 of the connecting seat 105, so that when the flange 102 is connected to the connecting seat 105, the legs 143 are close to the outer surface of the annular flange 151, and the claws 445 can hook the lower surface of the annular flange 151 and cooperate with the groove portion 353, the guiding portion 354, the ring body 360 and the limiting portion 355 of the annular flange 151. And in this embodiment, a roller 446 is embedded in the top surface of the claw 445, and the roller 446 is rotatably connected to the top surface of the claw 445. The rotation axis of the roller 446 extends along the radial direction of the disc 141, so that when the claw 445 hooks the lower surface of the annular flange 151, the roller 446 can roll against the lower surface of the annular flange 151, thereby facilitating the rotation of the flange 102 relative to the annular flange 151.

[0062] Specifically, when the flange 102 is in its initial position, the disc 141 of the flange 102 is supported above the annular flange 151 of the connecting seat 105, the flange sleeve 142 of the flange 102 extends into the cavity 350 of the connecting seat 105, the legs 143 of the flange 102 can be aligned with the groove portion 353, and the claws 445 can be at least partially received in the groove portion 353. When the flange 102 rotates a first angular range in the first direction from its initial position, the claws 445 of the flange 102 move along the guiding portion 354, so that the flange 102 presses the sealing ring 115 downward while rotating relative to the connecting seat 105, thereby sealingly connecting the flange 102 to the connecting seat 105. When the flange 102 rotates in the second angular range in the first direction, the claws 445 of the flange 102 move along the ring body 360, so that the flange 102 only makes a circumferential movement relative to the connecting seat 105. When the flange 102 rotates in the third angular range in the first direction, the claws 445 of the flange 102 continue to move along the ring body 360 until blocked by the limiting portion 355, so that the flange 102 reaches the locked position, and the locking mechanism 104 can lock the flange 102 and the connecting seat 105.

[0063] That is to say, when the flange 102 rotates within different angular ranges, the flange 102 mates with different parts of the annular flange 151 of the connecting seat 105. When the flange 102 rotates within the first angular range, the flange 102 mates with the guiding portion 354 of the connecting seat 105. When the flange 102 rotates within the second and third angular ranges, the flange 102 mates with the ring body 360 of the connecting seat 105. Therefore, when the flange 102 rotates within the first angular range along the first direction, the flange 102 can complete the installation and connection process with the connecting seat 105. When the flange 102 rotates within the first angular range along the second direction, the flange 102 can complete the disassembly process with the connecting seat 105.

[0064] In this embodiment, the disc 141 of the flange 102 is provided with four notches 144 at intervals in the circumferential direction, and the positions of the four notches 144 are correspondingly set with the positions of the toggle bolts 357 of the locking mechanism 104. Each notch 144 is recessed from the outer surface of the disc 141 inward to facilitate the entry of the toggle bolt 357 into the notch 144. Those skilled in the art can understand that the number of notches 144 can also be set to other numbers or other positions, as long as the number and positions of the notches 144 match the number and positions of the support seat 356, toggle bolt 357 and nut 359 in the locking mechanism 104.

[0065] The first tooth portion 149 at the bottom of the flange sleeve 142 of the flange 102 includes at least one tooth 413 and at least one tooth groove 447 arranged at intervals in the circumferential direction, and each tooth 413 extends axially downward. In this embodiment, the number of teeth 413 is two or more, and tooth grooves 447 are formed at intervals between adjacent teeth 413. The teeth 413 and tooth grooves 447 are used to mesh with the second tooth portion 129 at the top of the rotating shaft 128 so that the flange 102 can drive the rotating shaft 128 to rotate together.

[0066] Figure 5A - Figure 5C Shows the specific structures of the rotating shaft 128, the transmission mechanism 120 and the piston 110, where Figure 5A Shows a three-dimensional structure diagram of the rotating shaft 128, the transmission mechanism 120 and the piston 110, Figure 5B Shows Figure 5A Exploded view of Figure 5C Is a top view of the transmission mechanism 120. As Figure 5A - Figure 5CAs shown, the second tooth portion 129 at the bottom of the rotating shaft 128 includes at least one tooth 591 and at least one tooth groove 592 spaced apart in the circumferential direction, and each tooth 591 extends upward in the axial direction. In this embodiment, the number of teeth 591 corresponds to the number of teeth 413 of the first tooth portion 149, which is also two or more, and tooth grooves 592 are formed between adjacent teeth 591. When the first tooth portion 149 of the flange 102 is engaged with the second tooth portion 129 of the rotating shaft 128, the teeth 413 of the first tooth portion 149 extend into the tooth grooves 592 of the second tooth portion 129, and the teeth 591 of the second tooth portion 129 extend into the tooth grooves 447 of the first tooth portion 149. In this embodiment, the height of the teeth 591 and the tooth grooves 592 of the second tooth portion 129 is smaller than the height of the teeth 413 and the tooth grooves 447 of the first tooth portion 149, so that when the flange 102 and the rotating shaft 128 are engaged, a gap 785 can be formed between the top of the teeth 591 and the bottom of the tooth grooves 447 (see Figure 7A As shown), the flange channel 148 inside the flange sleeve 142 is fluidly connected to the outside of the flange sleeve 142. The total flow area of ​​the gap 785 is not less than the cross-sectional area of ​​the medium outlet of the pressure vessel and the medium inlet of the safety valve.

[0067] The cam 126 of the transmission mechanism 120 is sleeved on the outside of the rotating shaft 128, so that the rotating shaft 128 drives the cam 126 to rotate. The rotation plane of the cam 126 is perpendicular to the rotating shaft 128. As an example, the cam 126 and the rotating shaft 128 can be matched through a concave-convex structure, for example, the hole wall of the shaft hole 560 of the cam 126 has a concave portion 566, and the corresponding position on the outer wall of the rotating shaft 128 has a convex portion (not shown in the figure).

[0068] The pair of connecting rods 123 includes a left connecting rod 523a and a right connecting rod 523b. The outer walls of the left connecting rod 523a and the right connecting rod 523b are provided with a stopper 561 protruding outward, and the hole 515 of the support seat 125 is provided with a corresponding stopper groove 565, so that the left connecting rod 523a and the right connecting rod 523b can pass through the hole 515 on the support seat 125 respectively, and can move in the hole 515, but cannot rotate. In this embodiment, the stopper 561 is set at the rear side of the connecting rod 123, so that when Figure 5A and Figure 5BAt the shown angle, the limiting member 561 is blocked and invisible. In other embodiments, the limiting member 561 can also be arranged at other positions in the circumferential direction of the connecting rod 123, as long as the length of the limiting member 561 is greater than the movement stroke of the piston 110, and the limiting groove 565 on the hole 515 corresponds to the position of the limiting member 561. The left end of the left connecting rod 523a is connected to the piston 110, and the right end of the left connecting rod 523a is connected to the left side of the frame 122. The frame 122 drives the piston 110 to move through the left connecting rod 523a. The left end of the right connecting rod 523b is connected to the right side of the frame 122, and the right end of the right connecting rod 523b is a free end.

[0069] The cam 126 rotates around the axis of the rotating shaft 128 and has a changing radial distance during rotation to push the frame 122 and the connecting rod 123 to perform linear motion within a certain angular range, thereby driving the piston 110 to perform linear motion. In this embodiment, when the rotating shaft 128 drives the cam 126 to rotate along the first direction within the first angular range, the frame 122 and the connecting rod 123 are in the near stop position, that is, the cam 126 does not drive the frame 122 and the connecting rod 123 to move. When the rotating shaft 128 drives the cam 126 to rotate along the first direction within the second angular range, the frame 122 and the connecting rod 123 are in the lift position, that is, the cam 126 drives the frame 122 and the connecting rod 123 to move from right to left, so that the piston 110 moves from the closed position to the open position. When the rotating shaft 128 drives the cam 126 to rotate along the first direction within the third angular range, the frame 122 and the connecting rod 123 are in the far stop position, that is, the cam 126 does not drive the frame 122 and the connecting rod 123 to move.

[0070] When the rotating shaft 128 drives the cam 126 to rotate along the second direction within the third angular range, the frame 122 and the connecting rod 123 are in the far stop position, that is, the cam 126 does not drive the frame 122 and the connecting rod 123 to move. When the rotating shaft 128 drives the cam 126 to rotate along the second direction within the second angular range, the frame 122 and the connecting rod 123 are in the return stroke, that is, the cam 126 drives the frame 122 and the connecting rod 123 to move from left to right, so that the piston 110 moves from the open position to the closed position. When the rotating shaft 128 drives the cam 126 to rotate along the second direction within the first angular range, the frame 122 and the connecting rod 123 are in the near stop position, that is, the cam 126 does not drive the frame 122 and the connecting rod 123 to move.

[0071] Thus, when the flange 102 and the rotating shaft 128 rotate within different angular ranges, the cam 126 can drive or not drive the piston 110 to move. That is, when the flange 102 and the rotating shaft 128 rotate within the second angular range, the cam 126 drives the piston 110 to move, while when the flange 102 and the rotating shaft 128 rotate within the first angular range and the third angular range, the cam 126 does not drive the piston 110 to move.

[0072] Further combined with Figure 5C As shown, the cam 126 is a cam with equal width, the frame 122 is rectangular, and the distance between any two parallel tangents of the outer edge of the cam 126 is equal to the width of the frame 122, that is, the distance between the left side and the right side of the frame 122. Specifically, the outer contour of the cam 126 is an arc triangle, including three protrusions 562, 563, 564 and three arcs 581, 582, 583. The protrusion 562 and the protrusion 563 are connected by the arc 582, the protrusion 563 and the protrusion 564 are connected by the arc 583, and the protrusion 564 and the protrusion 562 are connected by the arc 581. The rotation axis 128 is eccentrically arranged relative to the cam 126. In this embodiment, the rotation axis 128 is arranged between the protrusion 563 and the arc 581, and is close to the protrusion 563 and far from the arc 581. The projection of the axis of the rotation axis 128 on the rotation plane of the cam 126 coincides with the center of the arc 581. Figure 5C shows the piston 110 in the open position, and the cam 126 drives the frame 122 to move to the rightmost end. The protrusion 563 abuts against the left side of the frame 122, and the arc 581 abuts against the right side of the frame 122. When the piston 110 is in the closed position, the cam 126 drives the frame 122 to move to the leftmost end (see Figure 7D the state shown), the protrusion 563 abuts against the right side of the frame 122, and the arc 581 abuts against the left side of the frame 122.

[0073] Figure 6A - Figure 10D shows different states of the valve seat 100 during the installation or disassembly of the installation valve and the pressure vessel, where Figure 6A - Figure 6D shows the structure of the valve seat 100 in the first state, Figure 7A - Figure 7D shows the structure of the valve seat 100 in the second state, Figure 8A - Figure 8D shows the structure of the valve seat 100 in the third state, Figure 9A - Figure 9D shows the structure of the valve seat 100 in the fourth state, Figure 10A - Figure 10D shows the structure of the valve seat in the fifth state.

[0074] As the flange 102 rotates, the valve seat 100 goes through various states in sequence. When the flange 102 rotates in the first direction, the valve seat 100 changes from the first state to the fifth state, which is used to show the installation process of the safety valve and the pressure vessel; when the flange 102 rotates in the second direction, the valve seat 100 changes from the fifth state to the first state, which is used to show the disassembly process of the safety valve and the pressure vessel. Among them, Table 1 shows the respective positions of the flange and the piston when the valve seat 100 is in each state to illustrate the interlocking relationship between them. As shown in Table 1 below, when the flange 102 rotates in the first direction, the piston 110 moves to the open position only after the flange 102 is sealingly connected to the connecting seat 105. And when the flange 102 rotates in the second direction, the flange 102 and the connecting seat 105 are disconnected only after the piston moves to the closed position, so that the flange 102 can be disassembled from the connecting seat 105.

[0075] Table 1 Positions of the flange and the piston when the valve seat is in each state

[0076] valve seat first state second state third state fourth state fifth state flange not installed initial position sealed connection maintain sealed connection locked position piston closed position closed position closed position open position open position

[0077] The following specifically describes each state of the valve seat 100 in combination with each drawing.

[0078] Figure 6A A cross-sectional view of the valve seat 100 shown in the first state along the Figure 2B A-A line in Figure 6B A top view of the valve seat 100 shown in the first state, Figure 6C A cross-sectional view of the valve seat 100 shown in the first state along the Figure 6A D-D line in Figure 6D A cross-sectional view of the valve seat 100 shown in the first state along the Figure 6A E-E line in Figure 6A - Figure 6D As shown, the adapter 108 has been connected to the bottom of the housing 101 to connect the pressure vessel to the valve seat 100 and fluidly connect the pressure chamber inside the pressure vessel to the inlet 236 of the pressure fluid passage 218. The flange 102 has not been connected to the connecting seat 105, so the safety valve has not been installed on the valve seat 100. The claw portion 445 of the flange 102 is aligned with the groove portion 353 of the connecting seat 105, but the flange sleeve 142 of the flange 102 has not been inserted into the connecting sleeve 152 of the connecting seat 105. The toggle bolt 357 of the locking mechanism 104 is in the lateral position and is not aligned with the notch 441 of the flange 102.

[0079] At this time, the piston 110 is in the leftmost closed position to close the pressure fluid passage 218. The frame 122 is also in the leftmost position. The rotating shaft 128 is on the right side of the frame 122.

[0080] Figure 7AA cross-sectional view of the valve seat 100 in the second state along the Figure 2B A - A line in Figure 7B A top view of the valve seat 100 in the second state, Figure 7C A cross-sectional view of the valve seat 100 in the second state along the Figure 6A D - D line in Figure 7D A cross-sectional view of the valve seat 100 in the second state along the Figure 6A E - E line in Figure 7A - Figure 7D As shown, the adapter 108 is still connected to the bottom of the housing 101 to connect the pressure vessel to the valve seat 100. The flange 102 has not yet been connected to the connection seat 105, so the safety valve has not been installed on the valve seat 100. The flange 102 is in the initial position. The disc 141 of the flange 102 is supported on the annular flange 151 of the connection seat 105, and the flange sleeve 142 of the flange 102 is inserted into the connection sleeve 152 of the connection seat 105. The first tooth portion 149 at the bottom of the flange sleeve 142 meshes with the second tooth portion 129 at the top of the rotating shaft 128. On the one hand, it enables the flange 102 to drive the rotating shaft 128 to rotate together. On the other hand, it enables the flange passage 148 to be in fluid communication with the outlet 135 of the pressure fluid passage 218 through the gap 785 between the first tooth portion 149 and the second tooth portion 129. The leg portion 143 of the flange 102 is close to the outer surface of the annular flange 151, and the claw portion 445 of the flange 102 is aligned with and enters the groove portion 353. The toggle bolt 357 of the locking mechanism 104 is still in the horizontal position and is still not aligned with the notch 441 of the flange 102.

[0081] At this time, the piston 110 is still in the leftmost closed position to close the pressure fluid passage 218. The frame 122 is also still in the leftmost position. The rotating shaft 128 is on the right side of the frame 122.

[0082] When the operator rotates the flange 102 by a first angular range in the first direction 780, the valve seat 100 reaches the third state.

[0083] Figure 8A A cross-sectional view of the valve seat 100 in the third state along the Figure 2B A - A line in Figure 8B A top view of the valve seat 100 in the third state, Figure 8C A cross-sectional view of the valve seat 100 in the third state along the Figure 6A D - D line in Figure 8D A cross-sectional view of the valve seat 100 in the third state along the Figure 6A E - E line in Figure 8A - Figure 8D As shown, the adapter 108 is still connected to the bottom of the housing 101 to connect the pressure vessel to the valve seat 100.

[0084] When the flange 102 rotates within the first angular range, the leg 143 of the flange 102 still abuts against the outer surface of the annular flange 151, and the claw 445 of the flange 102 starts to hook the annular flange 151. The claw 445 of the flange 102 moves along the guiding portion 354 to the connection between the guiding portion 354 and the ring body 360, causing the flange 102 to press down on the connecting seat 105 while rotating. At this time, the sealing ring 115 undergoes elastic deformation, enabling the flange 102 and the connecting seat 105 to be sealingly connected together to connect the safety valve to the valve seat 100. The toggle bolt 357 of the locking mechanism 104 still remains in the lateral position and is still not aligned with the notch 441 of the flange 102.

[0085] The rotation of the flange 102 drives the rotating shaft 128 to also rotate within the first angular range, and further drives the cam 126 to rotate within the first angular range. At this time, the cam 126 rotates within the frame 122, and the rotating shaft 128 still remains on the right side of the frame 122. During the process of the cam 126 rotating within the first angular range, the frame 122 is in the near-stroke, that is, the rotation of the cam 126 does not drive the frame 122 to move. The piston 110 still remains in the leftmost closed position to close the pressure fluid passage 218.

[0086] When the operator continues to rotate the flange 102 in the first direction 780 within the second angular range, the valve seat 100 reaches the fourth state.

[0087] Figure 9A A sectional view of the valve seat 100 in the fourth state taken along the Figure 2B A - A line in Figure 9B shows a top view of the valve seat 100 in the fourth state, Figure 9C A sectional view of the valve seat 100 in the fourth state taken along the Figure 6A D - D line in Figure 9D A sectional view of the valve seat 100 in the fourth state taken along the Figure 6A E - E line in Figure 9A - Figure 9D As shown in

[0088] When the flange 102 rotates within the second angular range, the leg 143 of the flange 102 still abuts against the outer surface of the annular flange 151, the claw 445 of the flange 102 still hooks the annular flange 151, and the claw 445 of the flange 102 moves along the ring body 360, causing the flange 102 to only rotate relative to the connecting seat 105, thereby maintaining the installation state of the flange 102 and the connecting seat 105, and further maintaining the connection of the safety valve to the valve seat 100. At this time, the claw 445 has not yet reached the limiting portion 355. The toggle bolt 357 of the locking mechanism 104 still remains in the lateral position and is still not aligned with the notch 441 of the flange 102.

[0089] Rotation of the flange 102 drives the rotary shaft 128 to also rotate within a second angular range, thereby driving the cam 126 to rotate within the second angular range. At this time, the cam 126 drives the frame 122 into the lift stroke, and the frame 122 moves rightward along the direction of arrow 881 (see Figure 8D shown). The rotary shaft 128 is located on the left side of the frame 122. The piston 110 moves rightward to the rightmost open position to open the piston chamber opening 234, thereby opening the pressure fluid passage 218, and further connecting the pressure chamber within the pressure vessel and the fluid inside the safety valve.

[0090] When the operator continues to rotate the flange 102 within a third angular range along the first direction 780, the valve seat 100 reaches the fifth state.

[0091] Figure 10A A cross-sectional view of the valve seat 100 in the fifth state along the Figure 2B A - A line in is shown, Figure 10B A top view of the valve seat 100 in the fifth state is shown, Figure 10C A cross-sectional view of the valve seat 100 in the fifth state along the Figure 6A D - D line in is shown, Figure 10D A cross-sectional view of the valve seat 100 in the fifth state along the Figure 6A E - E line in is shown. As Figure 10A - Figure 10D shown, the adapter 108 is still connected to the bottom of the housing 101 to connect the pressure vessel to the valve seat 100.

[0092] When the flange 102 rotates within the third angular range, the claw portion 445 of the flange 102 continues to rotate along the ring body 360 until it is blocked by the limiting portion 355. The flange 102 still maintains the installation state with the connecting seat 105, and thus still maintains the connection of the safety valve to the valve seat 100. At this time, the toggle bolt 357 of the locking mechanism 104 is aligned with the notch 441 of the flange 102, so the toggle bolt 357 can be rotated to the vertical state, and the toggle bolt 357 enters the notch 441 to lock the relative positions of the flange 102 and the connecting seat 105 both circumferentially and radially. And the nut 359 is fastened to the toggle bolt 357 from top to bottom, thereby axially locking the relative positions of the flange 102 and the connecting seat 105.

[0093] Rotation of the flange 102 drives the rotary shaft 128 to also rotate within a third angular range, thereby driving the cam 126 to rotate within the third angular range. At this time, the cam 126 rotates within the frame 122, and the frame 122 is in the far dead center, that is, the rotation of the cam 126 does not drive the frame 122 to move. The piston 110 still remains at the rightmost open position to open the pressure fluid passage 218, thereby connecting the pressure chamber within the pressure vessel and the fluid inside the safety valve.

[0094] Thus, after the valve seat 100 passes through the first state to the fifth state in sequence, the installation process of the safety valve and the pressure vessel can be completed.

[0095] As a specific example, the first angle range in this embodiment is 35°, the second angle range is 105°, and the third angle range is 28°.

[0096] Similarly, after the valve seat 100 passes through the fifth state to the first state in sequence, the disassembly process of the safety valve and the pressure vessel can be completed. During the disassembly process, the flange 102 rotates through the third angle range, the second angle range, and the first angle range in sequence. After the cam 126 drives the piston 110 to move to the closed position, the flange 102 and the connecting seat 105 are disassembled.

[0097] In some existing valve seats, usually two safety valves and a pressure vessel are connected to a three-way valve, and the safety valves are disassembled and inspected by alternating the use of the two safety valves. Or an additional stop valve is installed between the safety valve and the pressure vessel, and the stop valve is disconnected to close the pressure chamber to disassemble and inspect the safety valve. Such valve seats generally increase the cost on the one hand and are more complex in operation on the other hand, and it is easy for operators to miss steps.

[0098] When the valve seat of the present application utilizes different angle ranges of the flange rotation, the linkage of the flange, the rotating shaft and the cam enables the operator to install the safety valve to the pressure vessel only by rotating the flange. After the installation is completed, the passage between the pressure chamber inside the pressure vessel and the safety valve is automatically connected. Or before the safety valve is disassembled from the pressure vessel, the passage between the pressure chamber inside the pressure vessel and the safety valve is automatically disconnected before the safety valve can be disassembled from the pressure vessel. It is not only simple in operation but also low in cost.

[0099] Although the present disclosure has been described in connection with examples of the embodiments outlined above, various alternative, modifications, variations, improvements, and / or substantially equivalent alternatives, whether known or now or soon foreseeable, may be apparent to those of at least ordinary skill in the art. Therefore, the examples of the embodiments of the present disclosure as set forth above are intended to be illustrative rather than restrictive. Various changes may be made without departing from the spirit or scope of the present disclosure. Accordingly, the present disclosure is intended to cover all known or earlier developed alternative, modifications, variations, improvements, and / or substantially equivalent alternatives. The technical effects and technical problems described in this specification are exemplary rather than restrictive. It should be noted that the embodiments described in this specification may have other technical effects and may solve other technical problems.

Claims

1. A valve seat for mounting a safety valve to a pressure vessel or removing the safety valve from the pressure vessel, characterized in that: Comprising: A housing (101) having a pressure fluid passage (218) therein, and the safety valve and the pressure vessel are in fluid communication through the pressure fluid passage (218); A rotating shaft (128) rotatably disposed within the housing (101); A flange (102) whose top is for connection to the safety valve, and the flange (102) has a flange passage (148) that fluidly connects the pressure fluid passage (218) and the safety valve, wherein the flange (102) is configured to be rotatable in a first direction for installation to the housing (101), or rotatable in a second direction for removal from the housing (101), and the bottom of the flange (102) engages with the rotating shaft (128) such that rotation of the flange (102) drives the rotating shaft (128) to rotate together; A piston (110) disposed within the housing (101), the piston (110) having an open position and a closed position, the piston (110) opening the pressure fluid passage (218) in the open position and closing the pressure fluid passage (218) in the closed position, wherein the piston (110) is configured to be movable between the open position and the closed position; and A transmission mechanism (120) drivingly connected to the rotating shaft (128) and the piston (110), the transmission mechanism (120) being configured to convert the rotational motion of the rotating shaft (128) into the motion of the piston (110), wherein the transmission mechanism (120) includes: A cam (126) sleeved outside the rotating shaft (128), and the rotating shaft (128) drives the cam (126) to rotate; and Followers (122, 123) cooperating with the cam (126) and connected to the piston (110) to drive the piston (110) to perform linear motion through the rotation of the cam (126); Wherein, the valve seat (100) is configured such that as the flange (102) and the rotating shaft (128) rotate together in the first direction, the flange (102) is first installed to the housing (101), and then the transmission mechanism (120) drives the piston (110) to move to the open position; and as the flange (102) and the rotating shaft (128) rotate together in the second direction, the transmission mechanism (120) first drives the piston (110) to move to the closed position, and then the flange (102) is removed from the housing (101).

2. The valve seat according to claim 1, wherein: The flange (102) and the rotating shaft (128) have a first angular range, a second angular range, and a third angular range; The transmission mechanism (120) is configured to: When the flange (102) and the rotating shaft (128) rotate within the first angular range, the follower (122, 123) is in the near dead center position; When the flange (102) and the rotating shaft (128) rotate in a first direction within a second angular range, the cam (126) drives the follower (122, 123) to be in the lift stroke, the cam (126) drives the piston (110) to move to the open position, and when the flange (102) and the rotating shaft (128) rotate in a second direction within the second angular range, the cam (126) drives the follower (122, 123) to be in the return stroke, and the cam (126) drives the piston (110) to move to the closed position; and When the flange (102) and the rotating shaft (128) rotate within a third angular range, the follower (122, 123) is in the far dead center position.

3. The valve seat according to claim 2, wherein: The follower (122, 123) includes a frame (122) and at least one connecting rod (123), the cam (126) is connected within the frame (122), and the edge of the cam (126) contacts the frame (122), and the at least one connecting rod (123) rigidly connects the frame (122) and the piston (110); The cam (126) is arranged such that: When the follower (122, 123) is in the lift stroke or the return stroke, the cam (126) drives the piston (110) to perform a linear motion by driving the frame (122) to move; and When the follower (122, 123) is in the near dead center position or the far dead center position, the cam (126) does not drive the frame (122) to move.

4. The valve seat according to claim 3, wherein: The transmission mechanism (120) further includes a pair of support seats (125), the pair of support seats (125) are arranged within the housing (101) and connected to the bottom of the housing (101), and each support seat (125) includes a limit hole (515) for the connecting rod (123) to pass through; The at least one connecting rod (123) includes a pair of connecting rods (123), and one end of each connecting rod (123) in the pair of connecting rods (123) is connected to the frame (122), and the other end passes through the limit hole (515) to be supported on the support seat (125); Wherein, the support seat (125) is configured to limit the movement direction of the connecting rod (123), thereby limiting the movement direction of the piston (110).

5. The valve seat according to claim 2, wherein: The valve seat (100) further includes a connecting seat (105) in a hollow shape. The connecting seat (105) is fixedly connected to the top of the housing (101). The flange (102) is mounted to the housing (101) by connecting to the top of the connecting seat (105), and at least a part of the flange (102) passes through the connecting seat (105) to engage with the rotating shaft (128) inside the housing (101).

6. The valve seat according to claim 5, characterized in that: The valve seat (100) further includes a locking mechanism (104); The flange (102) has an initial position and a locking position. The flange (102) reaches the locking position after rotating through the first angular range, the second angular range, and the third angular range from the initial position; The flange (102) is configured to: When the flange (102) and the rotating shaft (128) rotate within the first angular range from the initial position, the flange (102) rotates and descends relative to the connecting seat (105) to be mounted to the connecting seat (105) in a pressing manner; When the flange (102) and the rotating shaft (128) rotate within the second angular range and the third angular range, the flange (102) rotates relative to the connecting seat (105); and After the flange (102) rotates to reach the locking position, the locking mechanism (104) can lock and connect the flange (102) to the connecting seat (105).

7. The valve seat according to claim 6, characterized in that: The locking mechanism (104) includes at least one turnbuckle bolt (357) and at least one nut (359). The at least one turnbuckle bolt (357) is pivotally connected to the connecting seat (105); The flange (102) has at least one notch (144). The locking mechanism (104) is configured such that when the flange (102) reaches the locking position, the turnbuckle bolt (357) can pass through the notch (144), and the flange (102) is locked and connected to the connecting seat (105) by the nut (359).

8. The valve seat according to claim 7, characterized in that: The connecting seat (105) includes a hollow-shaped connecting sleeve (152) and an annular flange (151). The annular flange (151) extends outward from the top edge of the connecting sleeve (152). The flange (102) includes a disc (141), a flange sleeve (142) in a hollow shape, and at least one leg (143). The disc (141) surrounds the flange sleeve (142). The top of the flange sleeve (142) is for installing the safety valve. The flange channel (148) is arranged in the flange sleeve (142). The at least one leg (143) extends downward from the lower surface of the disc (141). The distal end of each leg (143) has a claw portion (445) extending inward. Wherein the flange (102) is arranged such that when the flange (102) rotates, the disc (141) abuts against the upper surface of the annular flange (151), and the claw portion (445) hooks the annular flange (151) and moves along the lower surface of the annular flange (151).

9. The valve seat according to claim 8, wherein: The annular flange (151) includes at least one groove portion (353), at least one limiting portion (355), and at least one guiding portion (354) in the circumferential direction. The at least one guiding portion (354) is arranged on one side of the groove portion (353) in the first direction. The at least one limiting portion (355) is arranged on one side of the groove portion (353) in the second direction; Wherein, the at least one groove portion (353) is formed by radially recessing from the outer surface of the annular flange (151). The at least one groove portion (353) is configured such that when the flange (102) is in the initial position, the leg (143) of the flange (102) is aligned with the groove portion (353), and the claw portion (445) is at least partially received in the groove portion (353); The lower surface of the at least one guiding portion (354) extends downward obliquely from the groove portion (353) in the first direction, so that when the flange (102) rotates from the initial position in the first direction within the first angle range, the claw portion (445) moves along the lower surface of the guiding portion (354), so that the flange (102) rotates and descends relative to the connecting seat (105); The at least one limiting portion (355) protrudes downward from the lower surface of the annular flange (151). The at least one limiting portion (355) is configured such that when the flange (102) is in the locked position, the at least one limiting portion (355) blocks the leg (143) of the flange (102) in the first direction to limit the rotation of the flange (102).

10. The valve seat according to claim 8, wherein: The top of the claw portion (445) is provided with a roller (446). The roller (446) is arranged to abut against the lower surface of the annular flange (151) to facilitate the rotation of the flange (102) relative to the connecting seat (105).

11. The valve seat according to claim 8, wherein: The bottom of the flange sleeve (142) has a first tooth portion (149), and the top of the rotating shaft (128) has a second tooth portion (129). The first tooth portion (149) and the second tooth portion (129) are engaged so that the flange (102) and the rotating shaft (128) can rotate together; Wherein, the heights of the first tooth portion (149) and the second tooth portion (129) are different so that an inter-tooth opening (985) can be formed between the first tooth portion (149) and the second tooth portion (129). The inter-tooth opening (985) is configured to fluidly connect the pressure fluid passage (218) and the flange passage (148) of the flange (102).

12. The valve seat according to claim 1, characterized in that: The housing (101) defines a piston chamber (132), a connection chamber (133) and a transmission mechanism chamber (131). The piston (110) is disposed in the piston chamber (132), the transmission mechanism (120) is disposed in the transmission mechanism chamber (131), and the connection chamber (133) fluidly connects the pressure fluid passage (218) and the flange passage (148) of the flange (102). Wherein, the inlet (236) of the pressure fluid passage (218) is used to fluidly connect with the pressure vessel. The pressure fluid passage (218) extends through the piston chamber (132), and the outlet (135) of the pressure fluid passage (218) is fluidly connected with the flange passage (148) of the flange (102) through the connection chamber (133) so that the pressure fluid passage (218) fluidly connects the safety valve and the pressure vessel; Wherein the pressure fluid passage (218) includes several branch passages (238) arranged side by side. The branch passages (238) form several piston chamber openings (234) on the chamber wall defining the piston chamber (132). The piston (110) is configured to block the piston chamber openings (234) in the closed position, thereby closing the pressure fluid passage (218).

13. The valve seat according to claim 12, characterized in that: The housing (101) includes a top wall (273), a bottom wall (274) and four side walls (275, 276, 277, 278) arranged around the transmission mechanism chamber (131) and connected to each other. Wherein, the piston chamber (132) is disposed in one of the four side walls (275), and the connection chamber (133) is disposed in the top wall (273). Wherein, the branch passages (238) form several branch inlets (271) on the bottom wall (274) and several branch outlets (272) on the top wall (273); The valve seat (100) further includes an adapter (108) and a distributor (111). The distributor (111) is connected between the branch inlet (271) and the adapter (108). The distributor (111) is in the shape of a box with an open top. The pressure vessel is in fluid communication with the branch inlet (271) through the adapter (108) and the distributor (111). A connecting seat (105) is connected above the top wall (273) to mount the safety valve and the flange (102) above the top wall (273).

14. The valve seat according to claim 13, wherein: The sum of the cross-sectional areas of the plurality of branch inlets (271), the sum of the cross-sectional areas of the plurality of branch outlets (272), and the sum of the cross-sectional areas of the plurality of piston chamber openings (234) are equal, and are equal to the cross-sectional areas of the medium inlet of the safety valve and the medium outlet of the pressure vessel.

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