Cut-off sleeve type safety cut-off valve

Abstract

The utility model belongs to the technical field of cut-off valves, and discloses a cut-off type sleeve type safety cut-off valve which comprises a valve body, a valve cover, a sealing assembly, a separation assembly, a reset assembly and a cut-off assembly, an opening is formed in the bottom of the valve body, a front cavity and a rear cavity are formed in the valve body, and the valve cover blocks the opening of the valve body. The front cavity and the rear cavity are arranged in the valve body and matched with the valve body to form an installation cavity communicating with the front cavity and the rear cavity, the sealing assembly is installed on the cavity wall of the installation cavity, communication or separation of the front cavity and the rear cavity is achieved through the separation assembly, and the front cavity and the rear cavity are communicated by arranging the reset assembly and controlling the separation assembly to move downwards. In addition, the valve seat is arranged downwards, the sleeve is of a bottom-mounted type, and under the condition of long-time use or excessive impurities in pipeline gas, due to the fact that the contact face of the sleeve and the valve body is located on the upper portion, the impurities sink, the impurities can be prevented from being accumulated between the sleeve and the valve body, and the service life of the valve is prolonged. The service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of cut-off valves, in particular to a stop type sleeve safety cut-off valve. Background Art

[0002] The pressure control system of a natural gas transmission station mainly consists of a safety cut-off valve, a monitoring pressure regulating valve, a working regulating valve, etc. The valve body of the safety cut-off valve is connected to the pipeline in front of the monitoring pressure regulating valve through a flange. The pilot on the valve body is connected to the pipeline behind the working pressure regulating valve through a pressure guiding signal conduit, receives the downstream feedback control pressure, and controls the opening and closing of the safety cut-off valve through the downstream pressure, thereby controlling the downstream pressure within the set range to ensure the normal downstream pipeline gas supply pressure and the safe transmission of gas.

[0003] However, most of the stop type safety cut-off valves used in the current market are of the top-mounted type. The sleeve or valve plate is installed into the valve from the upper flange of the valve. When the valve is closed, the sleeve or valve plate releases and moves downward, contacts the valve seat position to achieve valve sealing and cut off gas transmission. In the case of long-term use of this top-mounted type safety cut-off valve or excessive gas impurities in the pipeline, impurity accumulation will occur at the valve seat position, affecting the sealing performance and prone to internal leakage. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a stop type sleeve safety cut-off valve, which can prevent impurity accumulation between the sleeve and the valve body and extend the service life.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A stop type sleeve safety cut-off valve, comprising:

[0007] A valve body, the bottom of the valve body is provided with an opening, and a front cavity and a rear cavity are arranged inside the valve body;

[0008] A valve cover, the valve cover plugs the opening of the valve body and cooperates with the valve body to form an installation cavity, and the installation cavity communicates the front cavity and the rear cavity;

[0009] A sealing assembly, the sealing assembly is installed on the cavity wall of the installation cavity;

[0010] A separating assembly, the separating assembly includes a support sleeve, a sleeve and an elastic member arranged in the installation cavity. One end of the support sleeve is connected to the valve cover, the sleeve is sleeved on the outer wall of the support sleeve, a limiting ring is circumferentially arranged on the outer wall of the sleeve, the elastic member is sleeved on the outer wall of the sleeve, and one end of the elastic member is limited at the bottom of the limiting ring, and the other end is limited at the valve cover. The elastic member is configured to drive the sleeve to move upward and circumferentially seal the sealing assembly to separate the front cavity and the rear cavity;

[0011] A reset component, one end of which extends into the valve body, and the reset component presses down the limiting ring in the first state to communicate the front cavity with the rear cavity;

[0012] A cutting component configured to cut the reset component out of the first state, so that the sleeve separates the front cavity from the rear cavity.

[0013] Preferably, the sealing component includes a valve seat, a sealing ring, a pressing plate and a plurality of bolts arranged at circumferential intervals. The valve seat includes a connecting part connected and arranged in an N shape and an L-shaped part arranged at the bottom. The cross-sectional shape of the pressing plate is L-shaped, and the pressing plate is spaced from the L-shaped part. The inner circumference of the sealing ring is clamped between the connecting part and the L-shaped part, the outer circumference of the sealing ring is clamped between the connecting part and the pressing plate, the bolts pass through the pressing plate and the connecting part and are screwed to the cavity wall of the installation cavity, and the sleeve moves upward and circumferentially abuts against the sealing ring to separate the front cavity from the rear cavity.

[0014] Preferably, the reset component includes a reset rod, a bearing seat and a bearing. One end of the reset rod extends into the installation cavity and is eccentrically connected to the bearing seat. An installation groove is circumferentially arranged on the outer wall of the bearing seat, and the bearing is installed in the installation groove. In the first state, the bearing presses down the limiting ring to communicate the front cavity with the rear cavity.

[0015] Preferably, the reset component further includes a connecting plate, the connecting plate is arranged on the side of the bearing seat away from the reset rod, and one end of the reset rod passes through the bearing seat and is bolted to the connecting plate.

[0016] Preferably, the reset component further includes a fixing sleeve. The valve body is provided with an installation hole, the fixing sleeve is threadedly connected to the installation hole, and the reset rod is rotatably inserted into the fixing sleeve.

[0017] Preferably, the reset component further includes a fixing seat and a housing. The fixing seat is installed on the side of the valve body. A pressing groove is circumferentially arranged on the side of the fixing seat close to the valve body. The fixing sleeve is limited in the pressing groove. The side of the fixing seat away from the valve body is inserted into the housing, and the housing is fixedly connected to the fixing seat.

[0018] Preferably, the cut-off sleeve type safety cut-off valve further includes a linkage assembly, which includes a trigger, a linkage plate, a linkage pin and a hook. The trigger is inserted into the fixed seat and connected to the other end of the reset rod. The top of the linkage plate is sleeved and fixedly connected to the trigger. The linkage pin is arranged at the bottom of the connecting plate. The middle part of the hook is rotatably connected to the housing, and a limiting groove is arranged at one end of the hook. In the first state of the reset assembly, the other end of the hook is limited to the cut-off assembly, and the linkage pin is limited to the limiting groove.

[0019] Preferably, the cut-off assembly includes a pilot valve, a movable rod and a rotating member. The pilot valve is installed on the side of the housing away from the valve body. A pressure sensing chamber is arranged at the bottom of the pilot valve. The pilot valve further has a movable chamber communicating with the pressure sensing chamber. The movable rod is movably arranged in the movable chamber in the vertical direction. A snap ring is arranged circumferentially in the middle part of the movable rod. The rotating member includes a connecting rod, a limiting rod and a disc connected thereto. One end of the connecting rod is rotatably arranged on the pilot valve, and the other end is connected to one end of the limiting rod. The cross-sectional shape of the limiting rod is semicircular. The other end of the hook can be limited to the arc surface of the limiting rod. The other end of the limiting rod is connected to the center of the disc. Two abutting rods are arranged at intervals on the side of the disc away from the connecting rod. The two abutting rods respectively abut against the top and the bottom of the snap ring. When the chamber pressure of the pressure sensing chamber exceeds or is lower than the set value, the movable rod is driven to move up or down, and one of the abutting rods is pushed up or down to drive the disc, the limiting rod and the connecting rod to rotate, and the other end of the hook is disengaged from the arc surface of the limiting rod.

[0020] Preferably, the cut-off assembly further includes a movable member, an overpressure elastic member and an underpressure elastic member. The movable member is movably arranged in the movable chamber, and the movable member includes a sleeved part and a blocking part connected thereto. The sleeved part is located above and its cross-sectional dimension is smaller than that of the blocking part. The blocking part circumferentially abuts against the chamber wall of the movable chamber. One end of the overpressure elastic member is limited to the top of the movable chamber, and the other end is limited to the sleeved part. The sleeved part is provided with an inner hole opening downward. One end of the underpressure elastic member is limited to the bottom of the inner hole of the sleeved part, and the other end is limited to the movable rod.

[0021] Preferably, the cut-off sleeve type safety cut-off valve further includes a connecting pipe, a balance valve is arranged on the connecting pipe, one end of the connecting pipe is hermetically communicated with the front chamber, and the other end of the connecting pipe is hermetically communicated with the rear chamber.

[0022] The beneficial effects of the present utility model:

[0023] A cut-off sleeve type safety cut-off valve provided by the utility model comprises a valve body, a valve cover, a sealing assembly, a separating assembly, a reset assembly and a cutting assembly. An opening is provided at the bottom of the valve body, and a front cavity and a rear cavity are arranged inside the valve body. The valve cover plugs the opening of the valve body and cooperates with the valve body to form an installation cavity. The installation cavity communicates the front cavity and the rear cavity. The sealing assembly is installed on the cavity wall of the installation cavity. The separating assembly includes a support sleeve, a sleeve and an elastic member arranged in the installation cavity. One end of the support sleeve is connected to the valve cover. The sleeve is sleeved on the outer wall of the support sleeve. A limiting ring is circumferentially arranged on the outer wall of the sleeve. The elastic member is sleeved on the outer wall of the sleeve, and one end of the elastic member is limited at the bottom of the limiting ring and the other end is limited at the valve cover. The elastic member is configured to drive the sleeve to move upward to be circumferentially sealed with the sealing assembly so as to separate the front cavity and the rear cavity. One end of the reset assembly extends into the valve body. The reset assembly presses down the limiting ring in the first state to communicate the front cavity and the rear cavity. The cutting assembly is configured to cut the reset assembly out of the first state so that the sleeve separates the front cavity and the rear cavity. For the cut-off sleeve type safety cut-off valve provided by the utility model, the communication or separation between the front cavity and the rear cavity can be realized by arranging the separating assembly. By arranging the reset assembly, the separating assembly is controlled to move downward to communicate the front cavity and the rear cavity. By arranging the cutting assembly and the sealing assembly, the separating assembly is moved upward to be sealed to isolate the front cavity and the rear cavity. In addition, the valve seat part is placed downward, and the sleeve adopts a bottom-mounted type. In the case of long-term use or excessive impurities in the pipeline gas, since the contact surface between the sleeve and the valve body is located above and the impurities sink, the accumulation of impurities between the sleeve and the valve body can be prevented, and the service life can be prolonged. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a sectional view of a cut-off sleeve type safety cut-off valve provided by an embodiment of the utility model in the first state Figure 1 ;

[0025] Figure 2 is a sectional view of a cut-off sleeve type safety cut-off valve provided by an embodiment of the utility model in the first state Figure 2 ;

[0026] Figure 3 is a sectional view of a cut-off sleeve type safety cut-off valve provided by an embodiment of the utility model when cut out of the first state Figure 1 ;

[0027] Figure 4 is a sectional view of a cut-off sleeve type safety cut-off valve provided by an embodiment of the utility model when cut out of the first state Figure 2 ;

[0028] Figure 5 is a combined sectional view of a linkage assembly and a cutting assembly provided by an embodiment of the utility model Figure 1 ;

[0029] Figure 6It is a combined sectional view of the linkage component and the cutting-off component provided by the embodiment of the present utility model. Figure 2 ;

[0030] Figure 7 It is a schematic structural diagram of the rotating member provided by the embodiment of the present utility model.

[0031] In the figure:

[0032] 1. Valve body; 2. Valve cover; 31. Connecting pipe; 32. Balance valve; 33. Ferrule; 41. Valve seat; 42. Sealing ring; 43. Pressure plate; 51. Support sleeve; 52. Sleeve; 53. Elastic member; 54. Limit ring; 61. Reset rod; 62. Bearing seat; 63. Bearing; 64. Connecting plate; 65. Fixed sleeve; 66. Fixed seat; 67. Housing; 71. Leveraging member; 72. Linkage plate; 73. Linkage pin; 74. Hook; 741. Limit groove; 81. Governor; 811. Activity chamber; 812. Pressure-sensing chamber; 82. Activity rod; 83. Rotating member; 831. Connecting rod; 832. Limit rod; 833. Disc; 834. Abutting rod; 84. Overpressure elastic member; 85. Underpressure elastic member; 86. Activity member. Detailed implementation manners

[0033] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0034] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0035] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0036] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0037] This embodiment provides a cut-off sleeve type safety cut-off valve. The valve seat part is placed downward, and the sleeve is bottom-mounted. In the case of long-term use or excessive impurities in the pipeline gas, since the contact surface between the sleeve and the valve body is located above and the impurities sink, it can prevent the accumulation of impurities between the sleeve and the valve body and extend the service life.

[0038] Please refer to Figures 1-7 , a cut-off sleeve type safety cut-off valve includes a valve body 1, a valve cover 2, a sealing component and a separating component. The valve body 1 is integrally cast, an opening is provided at the bottom of the valve body 1, and a front cavity and a rear cavity are provided inside the valve body 1. The valve cover 2 plugs the opening of the valve body 1, and the valve cover 2 cooperates with the valve body 1 to form an installation cavity in the middle area of the valve body 1. The installation cavity communicates with the front cavity and the rear cavity. The sealing component is arranged in the installation cavity and connected to the valve body 1. The separating component is arranged in the installation cavity and is configured to move upward to circumferentially abut against the sealing component to separate the front cavity and the rear cavity, or move downward to disengage from the sealing component to communicate the front cavity and the rear cavity.

[0039] Specifically, both the front cavity and the rear cavity communicate with the conveying pipeline. The front cavity communicates with the upstream, the rear cavity communicates with the downstream. After the front cavity and the rear cavity communicate in the installation cavity, an S-shaped flow channel is formed, and the air inlet of the front cavity is lower than the air outlet of the rear cavity, thereby forming a low-in and high-out conveying route.

[0040] Further, please refer to Figure 2 and Figure 4, in this embodiment, a connecting pipe 31 is further provided, and a balance valve 32 is provided on the connecting pipe 31. One end of the connecting pipe 31 is hermetically connected to the front chamber, and the other end of the connecting pipe 31 is hermetically connected to the rear chamber to ensure the pressure balance between the front chamber and the rear chamber. Preferably, pressure tapping ports are provided on both the front end of the valve body 1 and the valve cover 2, and the two pressure tapping ports are respectively connected to the front chamber and the rear chamber. Please refer to Figure 1 , and ferrule 33 is provided on each pressure tapping port. The ferrule 33 is circumferentially sealed to the pressure tapping port, and both ends of the connecting pipe 31 are hermetically inserted into the two ferrules 33 respectively.

[0041] Preferably, the valve cover 2 and the valve body 1 are fixedly connected by a plurality of bolts spaced circumferentially. It should be noted that there is a seal between the valve cover 2 and the valve body 1.

[0042] Specifically, please refer to Figure 1 and Figure 2 , the sealing assembly includes a valve seat 41, a sealing ring 42, a pressing plate 43 and a plurality of bolts spaced circumferentially. The valve seat 41 includes a connecting portion connected and arranged in an N shape and an L-shaped portion provided at the bottom. The cross-sectional shape of the pressing plate 43 is L-shaped, and the pressing plate 43 is spaced from the L-shaped portion. That is, the valve seat 41 and the pressing plate 43 cooperate to form an annular plate with an opening at the bottom. The inner circumference of the sealing ring 42 is clamped between the connecting portion and the L-shaped portion, and the outer circumference of the sealing ring 42 is clamped between the connecting portion and the pressing plate 43, and bolts are used to sequentially pass through the valve seat 41 and the pressing plate 43 and are screwed to the wall of the installation cavity.

[0043] Preferably, an annular groove is provided at the top of the connecting portion, and the internal components of the valve body 1 are circumferentially abutted in the annular groove to further improve the connection strength between the sealing assembly and the valve body 1.

[0044] Further, please refer to Figures 1-4 , the separating assembly includes a support sleeve 51, a sleeve 52 and an elastic member 53 provided in the installation cavity. The bottom of the support sleeve 51 is connected to the valve cover 2. The sleeve 52 is sleeved on the outer wall of the support sleeve 51. A limiting ring 54 is circumferentially provided on the outer wall of the sleeve 52. The elastic member 53 is sleeved on the outer wall of the sleeve 52, and one end of the elastic member 53 is limited to the bottom of the limiting ring 54, and the other end is limited to the valve cover 2. The elastic member 53 is configured to drive the sleeve 52 to move upward and separate the front chamber and the rear chamber. Specifically, when the limiting ring 54 is pressed down, the sleeve 52 moves downward, and the front chamber and the rear chamber are communicated, and the limiting ring 54 compresses the elastic member 53. When the pressure is removed, the limiting ring 54 drives the sleeve 52 to move upward under the action of the elastic member 53 and circumferentially abuts against the sealing ring 42, thereby separating the front chamber and the rear chamber.

[0045] Preferably, a plurality of annular grooves are provided at intervals on the outer wall of the support sleeve 51, and a seal is provided in each annular groove. The seal abuts against the inner wall of the sleeve 52 to achieve the seal between the support sleeve 51 and the sleeve 52. Further preferably, a metal plate is circumferentially connected to the top opening of the sleeve 52, and the top of the metal plate is flush with the edge of the sleeve 52. When the edge of the sleeve 52 abuts against the sealing ring 42 circumferentially, the metal plate can further enhance the separation effect between the front cavity and the rear cavity to achieve zero leakage.

[0046] Optionally, the support sleeve 51 and the valve cover 2 are fixedly connected by a plurality of bolts spaced circumferentially. It should be noted that a seal is provided between the valve cover 2 and the support sleeve 51.

[0047] Furthermore, a cut-off type sleeve safety shut-off valve provided in this embodiment further includes a reset assembly. The reset assembly has a first state. In the first state, the reset assembly can press down the limit ring 54 to move the sleeve 52 downward, so that the front cavity and the rear cavity communicate with each other.

[0048] Specifically, the reset assembly includes a reset rod 61, a bearing seat 62 and a bearing 63. An installation groove is circumferentially provided on the outer wall of the bearing seat 62, and the bearing 63 is installed in the installation groove. One end of the reset rod 61 extends into the installation cavity and is eccentrically connected to the bearing seat 62. The rotation of the reset rod 61 drives the bearing seat 62 and the bearing 63 to rotate eccentrically. In the first state, the reset rod 61 rotates until the bearing 63 presses down the limit ring 54, thereby communicating the front cavity and the rear cavity.

[0049] Furthermore, the reset assembly further includes a connecting plate 64. The connection between the reset rod 61 and the bearing seat 62 is realized through the connecting plate 64. Specifically, the connecting plate 64 is arranged on the side of the bearing seat 62 away from the reset rod 61 and is closely attached to the bearing seat 62. One end of the reset rod 61 passes through the bearing seat 62 and is bolted to the connecting plate 64, thereby realizing the connection between the connecting plate 64, the bearing seat 62, the bearing 63 and the reset rod 61.

[0050] Preferably, the reset assembly further includes a fixing sleeve 65. An installation hole is provided on the valve body 1, and the installation hole communicates with the installation cavity. The outer wall of the fixing sleeve 65 is threadedly connected to the hole wall of the installation hole, and the reset rod 61 rotates and is inserted into the fixing sleeve 65 to fix the position of the reset rod 61. Optionally, the other end of the reset rod 61 is exposed outside the fixing sleeve 65 for screwing and rotating the reset rod 61.

[0051] Further, the reset assembly further includes a fixed seat 66. The fixed seat 66 is installed on the side of the valve body 1. The fixed seat 66 is provided with an inner hole. A pressure groove is circumferentially provided on the side of the fixed seat 66 close to the valve body 1. The pressure groove communicates with the inner hole. The fixed sleeve 65 is circumferentially limited in the pressure groove, and the stability of the fixed sleeve 65 is further improved by the fixed seat 66. Further still, the cross-sectional shape of the fixed seat 66 is convex, and the cross-sectional dimension of the side of the fixed seat 66 away from the valve body 1 is smaller than that of the side close to the valve body 1. The reset assembly further includes a housing 67. The side of the fixed seat 66 away from the valve body 1 is inserted into the housing 67, and the housing 67 is attached to and connected to the side of the fixed seat 66 close to the valve body 1.

[0052] Exemplarily, a cut-off sleeve type safety cut-off valve further includes a linkage assembly. The linkage assembly is used to assist the cutting assembly to cut the reset assembly out of the first state, so that the sleeve 52 moves upward under the action of the elastic member 53 and circumferentially abuts against the sealing ring 42 to separate the front cavity from the rear cavity.

[0053] Specifically, please refer to Figure 2 , Figure 4 , Figure 5 and Figure 6 . The linkage assembly includes a lever 71, a linkage plate 72, a linkage pin 73 and a hook 74. One end of the lever 71 is inserted into the inner hole of the fixed seat 66 and connected to the other end of the reset rod 61. The other end of the lever 71 passes through the housing 67. The top of the linkage plate 72 is sleeved and fixedly connected to the lever 71. A linkage pin 73 is arranged at the bottom of the connecting plate 64. By screwing the lever 71, the reset rod 61 can be driven to rotate, and at the same time, the connecting plate 64 and the linkage pin 73 can be driven to rotate eccentrically. Further, the middle part of the hook 74 is rotatably connected to the housing 67. A limiting groove 741 is provided at one end of the hook 74. When the reset assembly is in the first state, the other end of the hook 74 is limited by the cutting assembly, and the linkage pin 73 rotates to be limited in the limiting groove 741. Since the elastic member 53 provides an upward pressure on the bearing 63 at this time, that is, a reset acting force on the lever 71, the hook 74 can maintain balance.

[0054] Further, please refer to Figures 5-7, the cutting component includes a commander 81, a movable rod 82 and a rotating member 83. Among them, the commander 81 is installed on the side of the housing 67 away from the valve body 1, so it is on the same side as the linkage plate 72. A pressure sensing chamber 812 is provided at the bottom of the commander 81, and the pressure sensing chamber 812 is communicated with the downstream of the conveying pipeline. Further, the commander 81 is also provided with a movable chamber 811 communicating with the pressure sensing chamber 812. The movable rod 82 is movably arranged in the movable chamber 811 in the vertical direction. A snap ring is circumferentially provided in the middle part of the movable rod 82. The rotating member 83 includes a connecting rod 831, a limiting rod 832 and a disc 833 connected. One end of the connecting rod 831 is rotatably arranged on the commander 81, and the other end is connected to one end of the limiting rod 832. The cross-sectional shape of the limiting rod 832 is semicircular. The other end of the hook 74 can be limited to the arc surface of the limiting rod 832. The other end of the limiting rod 832 is connected to the center of the disc 833. Two abutting rods 834 are spaced on the side of the disc 833 away from the connecting rod 831. The two abutting rods 834 respectively abut against the top and bottom of the snap ring. When the chamber pressure in the pressure sensing chamber 812 exceeds or is lower than the set value, it drives the movable rod 82 to move up or down, push up or down one of the abutting rods 834, so as to drive the disc 833, the limiting rod 832 and the connecting rod 831 to rotate. Since the cross-sectional shape of the limiting rod 832 is semicircular, when it rotates, the other end of the hook 74 disengages from the arc surface of the limiting rod 832, thus releasing the limit of the hook 74. At this time, the acting forces at both ends of the hook 74 are unbalanced, the hook 74 rotates, the linkage pin 73 disengages from the limiting groove 741, the elastic member 53 resets, drives the sleeve 52 to move up to separate the front chamber and the rear chamber, blocks the conveying pipeline from conveying gas, and cuts out the first state.

[0055] Optionally, a mounting seat is rotatably arranged on one side of the commander 81, and one end of the connecting rod 831 is connected to the mounting seat, and the rotation of the connecting rod 831 is realized through the mounting seat, so as to improve the stability of the connecting rod 831.

[0056] For example, the cut-off assembly further includes an overpressure elastic member 84, an underpressure elastic member 85 and a movable member 86, and the overpressure elastic member 84, the underpressure elastic member 85 and the movable member 86 cooperate to realize the upward or downward movement of the movable rod 82 when the cavity pressure of the pressure-sensing cavity 812 exceeds or falls below the set value. Specifically, the movable member 86 is movably arranged in the movable cavity 811, and the movable member 86 includes a connected sleeve portion and a blocking portion, the sleeve portion is located at the top and its cross-sectional size is smaller than the blocking portion, the blocking portion circumferentially abuts against the cavity wall of the movable cavity 811, and an annular plate is circumferentially arranged on the outer edge of the blocking portion, and the annular plate extends upward, one end of the overpressure elastic member 84 is limited to the top of the movable cavity 811, and the other end is sleeved on the sleeve portion and limited between the annular plate and the sleeve portion. The sleeve portion is provided with an inner hole and opens downward, one end of the underpressure elastic member 85 is limited to the bottom of the inner hole of the sleeve portion, and the other end is limited to the movable rod 82. Through the above arrangement, when the pressure fluctuation downstream of the conveying pipeline exceeds the set value, the instantaneous cavity pressure of the pressure-sensing cavity 812 exceeds the set value, and the cavity pressure overcomes the action force of the overpressure elastic member 84, pushing the movable member 86 upward, and then driving the movable rod 82 upward through the underpressure elastic member 85. When the pressure fluctuation downstream of the conveying pipeline is lower than the set value, the instantaneous cavity pressure of the pressure-sensing cavity 812 is lower than the set value, and the action force of the underpressure elastic member 85 overcomes the cavity pressure, pushing the movable member 86 downward, and then driving the movable rod 82 downward.

[0057] Before working, the stop sleeve type safety shut-off valve provided in this embodiment first opens the balancing valve 32 to balance the pressure of the front chamber and the rear chamber, and then screws the pull member 71. The reset rod 61 rotates to drive the bearing seat 62 and the bearing 63 to rotate eccentrically. The reset rod 61 rotates to the bearing 63 to press the limit ring 54, and the sleeve 52 moves down. The front chamber is connected with the rear chamber, and the gas is transported through the delivery pipeline. At the same time, the other end of the hook 74 is limited to the arc surface of the limit rod 832, and the linkage pin 73 is limited to the limit groove 741. The balancing valve 32 is closed. During the working process, when the pressure fluctuation downstream of the delivery pipeline exceeds Or lower than the set value, the instantaneous cavity pressure of the pressure-sensing cavity 812 overcomes the action force of the overpressure elastic member 84, or the action force of the underpressure elastic member 85 overcomes the instantaneous cavity pressure of the pressure-sensing cavity 812, pushes the movable member 86, and then drives the movable rod 82 to move, so as to drive the disc 833, the limiting rod 832 and the connecting rod 831 to rotate, and the other end of the hook 74 disengages from the arc surface of the limiting rod 832, thereby releasing the limit of the hook 74, and the hook 74 rotates, and the linkage pin 73 disengages from the limiting groove 741, and the elastic member 53 resets, driving the sleeve 52 to move upward to separate the front cavity and the rear cavity, thereby blocking the gas transported by the delivery pipeline.

[0058] The cut-off sleeve-type safety shut-off valve provided in this embodiment can prevent the accumulation of impurities between the sleeve 52 and the valve body 1, thereby extending the service life.

[0059] Obviously, the above-mentioned embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A cut-off sleeve type safety shut-off valve, characterized in that: include: A valve body (1), wherein the bottom of the valve body (1) is provided with an opening, and the interior of the valve body (1) is provided with a front cavity and a rear cavity; A valve cover (2), the valve cover (2) blocks the opening of the valve body (1) and cooperates with the valve body (1) to form a mounting cavity, the mounting cavity communicating with the front cavity and the rear cavity; A sealing component, the sealing component is installed on the cavity wall of the installation cavity; A partition assembly, the partition assembly comprising a support sleeve (51), a sleeve (52) and an elastic member (53) arranged in the installation cavity, one end of the support sleeve (51) being connected to the valve cover (2), the sleeve (52) being sleeved on the outer wall of the support sleeve (51), a limiting ring (54) being circumferentially arranged on the outer wall of the sleeve (52), the elastic member (53) being sleeved on the outer wall of the sleeve (52), one end of the elastic member (53) being limited at the bottom of the limiting ring (54), and the other end being limited at the valve cover (2), the elastic member (53) being configured to drive the sleeve (52) to move upward and circumferentially seal on the sealing assembly, so as to separate the front cavity from the rear cavity; a reset component, one end of which extends into the valve body (1), and in a first state, the reset component presses down the limit ring (54) to connect the front cavity with the rear cavity; A cutting assembly is configured to cut the resetting assembly out of the first state so that the sleeve (52) separates the front cavity from the rear cavity.

2. A cut-off sleeve type safety shut-off valve according to claim 1, characterized in that: The sealing assembly includes a valve seat (41), a sealing ring (42), a pressure plate (43) and a plurality of bolts arranged at circumferential intervals. The valve seat (41) includes a connecting portion that is connected and arranged in an N shape and an L-shaped portion arranged at the bottom. The cross-sectional shape of the pressure plate (43) is L-shaped, and the pressure plate (43) is spaced from the L-shaped portion. The inner side of the sealing ring (42) is circumferentially clamped between the connecting portion and the L-shaped portion. The outer side of the sealing ring (42) is circumferentially clamped between the connecting portion and the pressure plate (43). The bolts pass through the pressure plate (43) and the connecting portion and are screwed to the cavity wall of the installation cavity. The sleeve (52) moves up and circumferentially abuts against the sealing ring (42) to separate the front cavity and the rear cavity.

3. A cut-off sleeve type safety shut-off valve according to claim 1, characterized in that: The reset assembly comprises a reset rod (61), a bearing seat (62) and a bearing (63); one end of the reset rod (61) extends into the installation cavity and is eccentrically connected to the bearing seat (62); an installation groove is circumferentially arranged on the outer wall of the bearing seat (62); the bearing (63) is installed in the installation groove; in the first state, the bearing (63) presses down the limiting ring (54) to connect the front cavity and the rear cavity.

4. A cut-off sleeve type safety shut-off valve according to claim 3, characterized in that: The reset assembly further comprises a connecting plate (64), wherein the connecting plate (64) is arranged on a side of the bearing seat (62) away from the reset rod (61), and one end of the reset rod (61) passes through the bearing seat (62) and is bolted to the connecting plate (64).

5. A cut-off sleeve type safety shut-off valve according to claim 4, characterized in that: The reset assembly further comprises a fixing sleeve (65), the valve body (1) is provided with a mounting hole, the fixing sleeve (65) is threadedly connected to the mounting hole, and the reset rod (61) is rotatably inserted into the fixing sleeve (65).

6. A cut-off sleeve type safety shut-off valve according to claim 5, characterized in that: The reset assembly further comprises a fixing seat (66) and a cover shell (67), wherein the fixing seat (66) is mounted on the side of the valve body (1), a pressure groove is circumferentially arranged on a side of the fixing seat (66) close to the valve body (1), the fixing sleeve (65) is limited in the pressure groove, and a side of the fixing seat (66) away from the valve body (1) is inserted into the cover shell (67), and the cover shell (67) is fixedly connected to the fixing seat (66).

7. A cut-off sleeve type safety shut-off valve according to claim 6, characterized in that: The shut-off sleeve-type safety shut-off valve further comprises a linkage assembly, the linkage assembly comprising a pull piece (71), a linkage plate (72), a linkage pin (73) and a hook (74); the pull piece (71) is inserted into the fixed seat (66) and connected to the other end of the reset rod (61); the top of the linkage plate (72) is sleeved with and fixedly connected to the pull piece (71); the linkage pin (73) is arranged at the bottom of the connecting plate (64); the middle part of the hook (74) is rotatably connected to the cover shell (67); and one end of the hook (74) is provided with a limiting groove (741); when the reset assembly is in the first state, the other end of the hook (74) is limited to the shut-off assembly, and the linkage pin (73) is limited to the limiting groove (741).

8. A cut-off sleeve type safety shut-off valve according to claim 7, characterized in that: The cut-off assembly comprises a commander (81), a movable rod (82) and a rotating member (83). The commander (81) is mounted on a side of the housing (67) away from the valve body (1). A pressure-sensing chamber (812) is provided at the bottom of the commander (81). The commander (81) is also provided with a movable chamber (811) connected to the pressure-sensing chamber (812). The movable rod (82) is movably arranged in the movable chamber (811) along a vertical direction. A retaining ring is circumferentially arranged at the middle part of the movable rod (82). The rotating member (83) comprises a connected connecting rod (831), a limiting rod (832) and a disc (833). One end of the connecting rod (831) is rotatably arranged on the commander (81), and the other end is connected to one end of the limiting rod (832). The limiting rod (831) is connected to the valve body (812). The cross-sectional shape of the connecting rod (832) is semicircular, and the other end of the hook (74) can be limited to the arc surface of the limiting rod (832). The other end of the limiting rod (832) is connected to the center of the disc (833). Two abutting rods (834) are arranged at intervals on the side of the disc (833) away from the connecting rod (831). The two abutting rods (834) are respectively abutted against the top and bottom of the clamping ring. When the cavity pressure of the pressure-sensing cavity (812) exceeds or falls below the set value, the movable rod (82) is driven to move up or down, and one of the abutting rods (834) is pushed up or down to drive the disc (833), the limiting rod (832) and the connecting rod (831) to rotate, and the other end of the hook (74) is separated from the arc surface of the limiting rod (832).

9. A cut-off sleeve type safety shut-off valve according to claim 8, characterized in that: The cutting assembly further comprises a movable part (86), an overpressure elastic part (84) and an underpressure elastic part (85); the movable part (86) is movably arranged in the movable cavity (811), and the movable part (86) comprises a connected sleeve part and a blocking part; the sleeve part is located at the top and has a smaller cross-sectional size than the blocking part; the blocking part is circumferentially abutted against the cavity wall of the movable cavity (811); one end of the overpressure elastic part (84) is limited to the top of the movable cavity (811), and the other end is limited to the sleeve part; the sleeve part is provided with an inner hole opening downward; one end of the underpressure elastic part (85) is limited to the bottom of the inner hole of the sleeve part, and the other end is limited to the movable rod (82).

10. A cut-off sleeve type safety cut-off valve according to any one of claims 1 to 9, characterized in that: The cut-off sleeve-type safety shut-off valve further comprises a connecting pipe (31), a balancing valve (32) is arranged on the connecting pipe (31), one end of the connecting pipe (31) is sealed and connected to the front cavity, and the other end of the connecting pipe (31) is sealed and connected to the rear cavity.

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