An explosion-proof outlet device for an explosion-proof pressure transmitter

Abstract

This invention discloses an explosion-proof cable outlet device for an explosion-proof pressure transmitter, belonging to the field of pressure transmitter technology. It includes a plug-in socket integrally connected to the transmitter body; one end of a locking nut is rotatably connected to the outer periphery of the plug-in socket, while the other end is away from the plug-in socket; the female end of a connector is plugged into the male end of the transmitter body, and the male end is integrally connected to the cable body; the periphery of the female end of the connector is screwed to the portion of the locking nut away from the plug-in socket; one end of an adapter is screwed to the outer periphery of the male end of the connector; a clamping nut is screwed to the end of the adapter away from the connector; one end of a flexible hose is embedded between the clamping nut and the adapter; a first sealing component is located inside the adapter; a second sealing component is located inside the flexible hose and is fixedly connected to the movable end of the first sealing component, and the working end of the second sealing component can abut or move away from the periphery of the cable, thus improving both the sealing and clamping effect and the explosion-proof effect on the cable.

Description

Technical Field

[0001] This invention relates to the field of pressure transmitter technology, and more specifically, to an explosion-proof cable device for an explosion-proof pressure transmitter. Background Technology

[0002] In hazardous environments such as petroleum, chemical, and natural gas industries where explosive gas mixtures exist, pressure transmitters, as core field monitoring instruments, rely heavily on explosion-proof seals at their output terminals and cable protection structures to determine the overall explosion-proof safety performance of the device. Currently, most explosion-proof pressure transmitters use either direct cable exits through the housing or rigid metal conduit connections at their output terminals, and are equipped with conventional elastic sealing ring-type explosion-proof seals. Traditional cable outlet structures rely solely on a single-layer simple sealing gasket or a single conical elastic sealing ring to achieve explosion-proof sealing between the cable and the connector. Under long-term compression conditions, the sealing ring is prone to rubber creep and stress relaxation. Alternating high and low temperatures and on-site vibration further accelerate the degradation of sealing performance. Furthermore, during cable installation, eccentricity and misalignment are easily observed, resulting in uneven stress on the sealing ring and cable sheath, creating localized micro-gaps. Explosive flames and explosive gas mixtures can propagate outwards along these gaps. If the gap exceeds the explosion-proof extinguishing threshold, it can directly cause equipment failure, resulting in poor explosion-proof sealing reliability. In addition, the compression of the sealing ring is controlled solely by manually tightening the clamping screw, making it difficult to uniformly control the assembly force. Excessive tightening force can cause the rubber to crack, while insufficient tightening force results in inadequate sealing and poor assembly consistency in mass production.

[0003] Therefore, there is an urgent need for an explosion-proof wiring device for explosion-proof pressure transmitters to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide an explosion-proof cable outlet device for an explosion-proof pressure transmitter to solve the aforementioned technical problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: An explosion-proof wiring device for an explosion-proof pressure transmitter includes a plug socket, a locking nut, a mating plug, an adapter, a clamping nut, a hose, a first sealing assembly, and a second sealing assembly. The mounting end of the plug-in socket is integrated with the transmitter body; One end of the locking nut is rotatably connected to the outer periphery of the plug socket, while the other end is away from the plug socket; The female end of the connector is plugged into the male end of the transmitter body, and the male end is integrally connected to the cable body. The periphery of the female end of the connector is screwed into the section of the locking nut away from the connector socket. One end of the adapter is screwed onto the outer periphery of the male end of the mating plug; The clamping nut is screwed onto the end of the adapter furthest from the mating plug; One end of the hose is fitted between the compression nut and the adapter; The first sealing assembly is located inside the adapter and is used to cut off the fluid flowing from the adapter to the mating plug; The second sealing assembly is located inside the hose and is fixed to the movable end of the first sealing assembly, used to cut off the fluid flowing from the hose to the adapter.

[0006] Furthermore, the inner side of the adapter is provided with a conical movable chamber and an annular groove for accommodating the first sealing component. The narrow diameter end of the movable chamber faces the side where the docking plug is located, and the outer diameter of the narrow diameter end of the movable chamber is consistent with the inner diameter of the docking plug. The annular groove is adjacent to the movable chamber.

[0007] Furthermore, the first sealing assembly includes a sealing block, a compression washer, a compression block, and a sealing ring; The tapered sealing block is slidably disposed within the movable chamber, with the midpoint of the inclined surface of the sealing block and the apex of the narrow diameter end of the movable chamber on the same plane; The compression washer is embedded in the annular groove, and the inner diameter of the compression washer is smaller than the outer diameter of the wide end of the sealing block; The clamping block is slidably positioned at one end of the adapter near the hose. The interior of the clamping block has a coaxial through-hole for accommodating the cable. The end face of the clamping block near the hose is in contact with the sealing ring. The sealing ring is placed between the hose and the adapter, and the inner diameter of the sealing ring is smaller than the outer diameter of the end of the clamping block closest to the hose.

[0008] Furthermore, the hose has a slide rail for accommodating the second sealing component along its axial direction inside, and the clamping block also has a through hole for accommodating the traction rope of the second sealing component inside. The slide rail is axially parallel to the through hole, and the axis of the slide rail is located in the inner diameter area of ​​the clamping washer.

[0009] Furthermore, the second sealing assembly includes two sealing units mirror-arranged inside the hose, the working ends of the two sealing units being able to approach or move away from the periphery of the cable, and the sealing unit includes a fixed rod, a rotating block, a valve plate, and a connecting arm. The fixing rod is fixed in the mounting groove of the hose. The width direction of the mounting groove is consistent with the radial direction of the hose, and the length direction of the fixing rod is consistent with the width direction of the mounting groove. The rotating block is coaxially mounted around the periphery of the fixed rod; The valve plate is slidably disposed on the inner side of the hose. The length direction of the valve plate is consistent with the radial direction of the hose, and one side of the valve plate forms a tooth meshing transmission with the rotating block. The end of the valve plate near the axis of the hose abuts against the periphery of the cable. One end of the connecting arm is fixed to the periphery of the rotating block, and the other end is turned outward toward the end of the hose away from the through hole. The vertex of the end of the connecting arm away from the rotating block is in the same plane as the axis of the slide. One end of the traction rope is fixed to the end of the sealing block away from the docking plug, and the other end is fixed to the top of the connecting arm.

[0010] Furthermore, the mounting groove is provided with a groove for accommodating the valve plate on the side near the slide rail. The groove is connected to the mounting groove, and the inner wall of the groove slides in contact with the circumference of the valve plate. The bottom of the groove is spaced apart from the slide rail, and the depth of the groove is greater than the distance between the end of the valve plate and the periphery of the cable.

[0011] Furthermore, the circumference of the rotating block is provided with multiple racks, and the side of the valve plate near the mounting groove is recessed with multiple toothed grooves, and the circumference of at least one rack abuts against the inner wall of the corresponding toothed groove.

[0012] Furthermore, the length of the racks is equal to the sum of the lengths of the slots.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: In this application, during installation, the axial alignment of the plug and socket is first achieved by connecting them, and then radial centering is achieved by tightening the threads of the locking nut. The cable axis is forcibly constrained on the coaxial path of the socket and plug, avoiding eccentricity and misalignment caused by manual operation when the cable directly squeezes the elastic sealing ring during installation. When the clamping nut is tightened, its axial thrust is applied to the end of the hose, and the clamping force is transmitted to the first sealing component step by step through the fixed connection between the hose and the movable end of the second sealing component. The maximum compression displacement is controlled by the fixed stroke of the threaded pair and the end face limit, which not only forms a uniform annular sealing band, keeping the explosion-proof gap within the critical size of the flameout, but also ensures the minimum clamping force to prevent overpressure from cracking the rubber, thereby improving the consistency of batch assembly. Since the moving end of the second sealing component is fixed to the first sealing component, when an explosive gas or flame is generated in the internal environment of the hose, the moving end of the first sealing component will move towards the side of the adapter closer to the docking plug due to the impact force generated by the gas or flame explosion, and block the passage between the adapter and the docking plug. During this process, the first sealing component drives the working end of the second sealing component to come into contact with the cable and cuts off the passage of external fluid to the adapter. Even if the first-stage seal has a small gap due to long-term compression, the second-stage seal can still prevent the explosive flame or high-temperature gas from being conducted outward, greatly reducing the risk of explosion failure when the gap size exceeds the single-stage explosion-proof critical value. Attached Figure Description

[0014] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings: Figure 1 This is a structural schematic diagram of the assembled state provided in the embodiments of this application; Figure 2 This is a schematic diagram of the internal structure under partial resection conditions provided in an embodiment of this application; Figure 3 for Figure 2 A magnified view of a portion of region A in the middle; Figure 4 for Figure 2 A magnified view of a portion of region B in the middle; Figure 5 for Figure 2 A magnified view of a portion of region C in the middle; Figure 6 This is a schematic diagram of the valve plate provided in an embodiment of this application; Figure 7 for Figure 2 A magnified view of a portion of region D.

[0015] Reference numerals: 1-Transmitter body; 2-Cable; 10-Match socket; 20-Locking nut; 30-Match plug; 40-Adapter; 401-Moving chamber; 402-Annular groove; 50-Compression nut; 60-Hose; 601-Slide rail; 602-Mounting groove; 603-Slide groove; 70-First sealing assembly; 71-Sealing block; 72-Compression washer; 73-Compression block; 731-Smooth hole; 732-Through hole; 74-Sealing ring; 80-Second sealing assembly; 81-Fixing rod; 82-Rotating block; 821-Rack; 83-Valve plate; 831-Groove; 84-Connecting arm; 85-Traction rope. Detailed Implementation

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0017] See Figures 1 to 7As shown, an explosion-proof cable outlet device for an explosion-proof pressure transmitter includes a plug socket 10, a locking nut 20, a mating plug 30, an adapter 40, a clamping nut 50, a hose 60, a first sealing assembly 70, and a second sealing assembly 80. The mounting end of the plug socket 10 is integrally connected to the transmitter body 1. One end of the locking nut 20 is rotatably connected to the outer periphery of the plug socket 10, while the other end is away from the plug socket 10. The female end of the mating plug 30 is inserted into the male end of the transmitter body 1, and its male end is integrally connected to the cable 2 body. The periphery of the female end of the mating plug 30 is separated from the locking nut 20 by the portion away from the plug socket 10. A section of the cable 40 is screwed in; one end of the adapter 40 is screwed to the outer periphery of the male end of the connector 30; a clamping nut 50 is screwed to the end of the adapter 40 away from the connector 30; one end of the hose 60 is embedded between the clamping nut 50 and the adapter 40; a first sealing component 70 is located inside the adapter 40 and is used to cut off the fluid flowing from the adapter 40 to the connector 30; a second sealing component 80 is located inside the hose 60 and is fixed to the movable end of the first sealing component 70, and the working end of the second sealing component 80 can approach or move away from the periphery of the cable 2 to cut off the fluid flowing from the hose 60 to the adapter 40.

[0018] It should be noted that the fluid in this application is an explosive gas or flame.

[0019] In the above scheme, during installation, the axial alignment of the connector 30 and the socket 10 is first achieved, and then radial centering is achieved by screwing the locking nut 20 into the thread. The cable 2 axis is forcibly constrained on the coaxial path of the socket and the connector, avoiding eccentricity and misalignment caused by manual operation when the cable directly squeezes the elastic sealing ring 74 during the installation process. When the clamping nut 50 is tightened, its axial thrust is applied to the end of the hose 60, and the clamping force is transmitted to the first sealing component 70 step by step through the fixed connection between the hose 60 and the movable end of the second sealing component 80. The maximum compression displacement is controlled by the fixed stroke of the threaded pair and the end face limit, which not only forms a uniform annular sealing band, keeping the explosion-proof gap within the critical size of the flameout, but also ensures the minimum clamping force to prevent overpressure from cracking the rubber, thereby improving the consistency of batch assembly. Since the movable end of the second sealing component 80 is fixedly connected to the movable end of the first sealing component 70, when an explosive gas or flame is generated in the internal environment of the hose 60, the movable end of the first sealing component 70 will move towards the side of the adapter 40 closer to the docking plug 30 due to the impact force generated by the gas or flame explosion, and block the passage between the adapter 40 and the docking plug 30. During this process, the first sealing component 70 drives the working end of the second sealing component 80 to come into contact with the cable 2 and cuts off the passage of external fluid to the adapter 40. Even if the first-stage seal has a small gap due to long-term compression, the second-stage seal can still prevent the explosive flame or high-temperature gas from being conducted outward, greatly reducing the risk of explosion failure when the gap size exceeds the single-stage explosion-proof critical value.

[0020] The inner side of the adapter 40 is provided with a conical movable chamber 401 and an annular groove 402 for accommodating the first sealing assembly 70. The narrow diameter end of the movable chamber 401 faces the side where the docking plug 30 is located. The outer diameter of the narrow diameter end of the movable chamber 401 is consistent with the inner diameter of the docking plug 30. The annular groove 402 is adjacent to the movable chamber 401.

[0021] In the above scheme, when the clamping nut 50 is tightened, it applies an axial thrust to the first sealing assembly 70 in the direction of the mating plug 30 through the end of the hose 60 and the second sealing assembly 80. Since the inner wall of the movable chamber 401 is conical, when the first sealing assembly 70 moves axially towards the narrow diameter end, it is subjected to radial inward compression from the conical surface, converting the axial clamping force into a uniform radial clamping force, tightly fitting the sheath of the cable 2 through which it passes, thus avoiding the phenomenon of one-sided compression and opposite-sided loosening caused by cable eccentricity. The annular groove 402 is adjacent to the movable chamber 401, providing space to accommodate excess rubber from radial expansion or axial extension of the first sealing assembly 70 after being compressed, preventing excessive compressive stress inside the seal body from causing cracking.

[0022] The first sealing assembly 70 includes a sealing block 71, a compression washer 72, a compression block 73, and a sealing ring 74. The tapered sealing block 71 is slidably disposed within the movable chamber 401, with the midpoint of the inclined surface of the sealing block 71 and the apex of the narrow diameter end of the movable chamber 401 on the same plane. The compression washer 72 is embedded in the annular groove 402, and the inner diameter of the compression washer 72 is smaller than the outer diameter of the wide diameter end of the sealing block 71. The compression block 73 is slidably disposed at one end of the adapter 40 near the hose 60, and a light hole 731 for accommodating the cable 2 is coaxially passed through the inner side of the compression block 73. The end face of the compression block 73 near the hose 60 is in contact with the sealing ring 74. The sealing ring 74 is in contact between the hose 60 and the adapter 40, and the inner diameter of the sealing ring 74 is smaller than the outer diameter of the end of the compression block 73 near the hose 60.

[0023] In the above scheme, when the clamping nut 50 is tightened, the axial clamping force first acts on the sealing ring 74 at the end of the hose 60. Since the inner diameter of the sealing ring 74 is smaller than the outer diameter of the clamping block 73 near the end of the hose 60, the end face of the clamping block 73 supports the deformation of the sealing ring 74 when it is squeezed, and at the same time converts the thrust of the clamping nut 50 into an axial push on the end face of the clamping block 73. The cable 2 is guided through the coaxial through hole 731, and the thrust is smoothly transmitted to the clamping washer 72 and the sealing block 71, effectively buffering the impact load when the thread is tightened, and avoiding damage to the internal conical seal due to instantaneous overload. In the free state, the axial center section of the effective conical section of the sealing block 71 is directly opposite the narrow diameter section (minimum throat position) of the movable chamber 401.

[0024] When the axial force pushes the sealing block 71 towards the narrow end, the conical contact band of the sealing block 71 expands symmetrically forward and backward with the midpoint as the boundary, so that the initial contact line between the outer conical surface of the sealing block 71 and the inner conical surface of the movable chamber 401 is located on the optimal mechanical radius. During continuous compression, the radial shrinkage deformation generated by the sealing block 71 is symmetrically and evenly distributed along the circumference of the cable 2, avoiding the "wedge" phenomenon of one side contacting first and the other side contacting later due to the deviation of the taper starting point. Since the compression washer 72 is axially fixed by the annular groove 402, the compression washer 72 constitutes a mechanical anti-reverse limit for the sealing block 71 towards the hose 60, preventing the sealing block 71 from rebounding and loosening outward (to the hose 60 side) when the equipment vibrates or the internal air pressure fluctuates. At the same time, when the sealing block 71 is pushed towards the narrow end under pressure, its wide-diameter end outer edge forms an end face fit with the inner hole edge of the compression washer 72, preventing the rubber at the root of the sealing block 71 from being squeezed into the sliding gap between the compression block 73 and the adapter 40 under high pressure. The light hole 731, which is coaxially penetrating the inner side of the clamping block 73, is used to accommodate the cable 2 and plays a radial centering and guiding role, ensuring that the cable 2 has been aligned with the geometric axis of the adapter 40 before passing through the sealing block 71.

[0025] The hose 60 has a slide 601 arranged along its axial direction inside for accommodating the traction rope 85 of the second sealing assembly 80. The clamping block 73 also has a through hole 732 for accommodating the second sealing assembly 80. The slide 601 and the through hole 732 are arranged coaxially, and the axis of the slide 601 is located in the inner diameter area of ​​the clamping washer 72.

[0026] In the above scheme, when the first sealing component 70 moves the traction rope 85 of the second sealing component 80, the traction rope 85 slides precisely axially along the inner wall of the slide 601 and the through hole 732. The coaxial guide structure restricts the movement freedom of the second sealing component 80 to translation only along the axis. The axis of the slide 601 is located in the inner diameter area of ​​the compression washer 72, providing clearance space for the movement of the second sealing component 80. During the compression process, the reverse support force generated by the second sealing component 80, the elastic restoring force of the sealing ring 74, and the reverse wedging force of the moving chamber 401 on the sealing block 71 are all balanced along this common axis, without any interference from radial component forces or overturning torques.

[0027] The second sealing assembly 80 includes two sealing units mirror-mounted inside the hose 60. The working ends of the two sealing units can move closer to or further away from the periphery of the cable 2. Each sealing unit includes a fixed rod 81, a rotating block 82, a valve plate 83, and a connecting arm 84. The fixed rod 81 is fixed within the mounting groove 602 of the hose 60. The width direction of the mounting groove 602 is aligned with the radial direction of the hose 60, and the axial length direction of the fixed rod 81 is aligned with the width direction of the mounting groove 602. The rotating block 82 is coaxially mounted around the fixed rod 81. The valve plate 83 is slidably mounted inside the hose 60. The length direction of the valve plate 83 is consistent with the radial direction of the hose 60, and one side of the valve plate 83 forms a toothed transmission with the rotating block 82. The end of the valve plate 83 near the axis of the hose 60 abuts against the periphery of the cable 2. One end of the connecting arm 84 is fixed to the periphery of the rotating block 82, and the other end is turned outward toward the end of the hose 60 away from the through hole 732. The vertex of the end of the connecting arm 84 away from the rotating block 82 is in the same plane as the axis of the slide 601. One end of the traction rope 85 is fixed to the end of the sealing block 71 away from the docking plug 30, and the other end is fixed to the top of the connecting arm 84.

[0028] In the above scheme, when an explosive gas or flame is generated inside the hose 60, the movable end of the first sealing assembly 70 (the end of the sealing block 71 near the narrow diameter end of the movable chamber 401) will move towards the adapter 40 near the docking plug 30 due to the impact force generated by the gas or flame explosion. During this process, the traction rope 85 fixed to the sealing block 71 is pulled accordingly. The other end of the traction rope 85 is fixed to the top of the connecting arm 84, and the connecting arm 84 is fixed to the rotating block 82. Therefore, the axial linear motion of the traction rope 85 is converted into the circumferential rotational motion of the rotating block 82 around the fixed rod 81. The rotating block 82 drives the valve plate 83 through gear meshing. Since the length direction of the valve plate 83 is consistent with the radial direction of the hose 60 and is slidably disposed inside the hose 60, the rotational motion of the rotating block 82 is finally converted into the linear sliding of the valve plate 83 along the radial direction of the hose 60, causing its working end to approach and abut against the circumference of the cable 2. Furthermore, since the traction ropes 85 of both sealing units are fixed to the same sealing block 71, the axial movement of the sealing block 71 simultaneously pulls the two traction ropes 85. The mirror-symmetrical sealing units ensure that the rotation directions of the rotating blocks 82 on both sides are symmetrical and the radial sliding distances of the valve plates 83 are equal. This allows the working ends of the two valve plates 83 to synchronously approach the axis of the cable 2 at equal speeds and with equal strokes, thereby cutting off the flow of external fluid to the adapter 40 and improving the explosion-proof effect on the cable 2. In this application, the traction ropes 85 are made of a deformable material.

[0029] The mounting groove 602 is provided with a sliding groove 603 on the side near the slide rail 601 to accommodate the valve plate 83. The sliding groove 603 is connected to the mounting groove 602. The inner wall of the sliding groove 603 is in sliding fit with the circumferential surface of the valve plate 83. The bottom of the sliding groove 603 is spaced apart from the slide rail 601. The depth of the sliding groove 603 is greater than the distance between the end of the valve plate 83 and the periphery of the cable 2.

[0030] In the above scheme, the mounting groove 602 is provided with a sliding groove 603 on the side near the slide rail 601 to accommodate the valve plate 83, and the sliding groove 603 is connected to the mounting groove 602, so that the valve plate 83 is constrained by the full-enclosed sliding fit of the inner wall of the sliding groove 603 on the circumferential surface. When the rotating block 82 drives the valve plate 83 through gear meshing transmission, the valve plate 83 can only slide back and forth in the radial straight direction defined by the sliding groove 603, avoiding clamping seal failure caused by uncontrolled movement trajectory of the valve plate 83. The groove depth of the sliding groove 603 is greater than the distance between the end of the valve plate 83 and the periphery of the cable 2, so that when the working end of the valve plate 83 abuts against the periphery of the cable 2, the end of the valve plate 83 away from the cable 2 is still in contact with the sliding groove 603, preventing the valve plate 83 from disengaging from the sliding groove 603, thereby ensuring that the valve plate 83 can stably open and close the fluid passage.

[0031] The rotating block 82 is provided with a plurality of racks 821 around its periphery, and the valve plate 83 is provided with a plurality of grooves 831 on one side near the mounting groove 602, and at least one rack 821 has its periphery abutting against the inner wall of the corresponding groove 831.

[0032] In the above scheme, when the rotating block 82 is driven to rotate by the traction rope 85, multiple racks 821 simultaneously push the wall of their corresponding tooth grooves 831, decomposing the rotational torque into multiple tangential components, which together drive the valve plate 83 to slide radially along the slide groove 603, avoiding local wear or deformation caused by concentrated loads. In the free state, the circumferential surface of at least one rack 821 abuts against the inner wall of the corresponding tooth groove 831, that is, maintaining the rack 821 in pre-contact or clearance-free fit with the valve plate 83. When the traction rope 85 produces a small axial displacement, the abutting tooth surface immediately transmits the torque, and there is no idle stroke caused by tooth side clearance, ensuring zero delay in the transmission response between the pulling of the traction rope 85 and the radial movement of the valve plate 83, improving the sensitivity and synchronization of the clamping and cutting-off action.

[0033] In practice, the valve plate 83 in this application includes a rectangular plate and an arc-shaped plate, the inner diameter curvature of which matches the circumferential curvature of the cable 2. The distance between the inner diameter and the outer diameter of the arc-shaped plate is equal to the distance between the circumference of the cable 2 and the inner wall of the hose 60.

[0034] The length of the racks 821 is equal to the sum of the lengths of the slots 831.

[0035] In the above scheme, when the rotating block 82 starts rotating to drive the valve plate 83 from the initial position, the effective working arc of the rack 821 and the effective accommodating stroke of the tooth groove 831 start and stop simultaneously. When the valve plate 83 slides radially to the maximum feed position (for example, when the working end of the valve plate 83 abuts against the circumference of the cable 2 or the bottom of the groove 603), the end point of the rack 821's layout length coincides with the end point of the tooth groove 831's layout length. At this time, the tooth surface at the end of the rack 821 and the groove wall at the end of the tooth groove 831 form an end face abutment stop, thereby enabling the axial tension of the traction rope 85 to be smoothly and continuously converted into the radial clamping force of the valve plate 83, without obvious pulsation or impact.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An explosion-proof cable outlet device for an explosion-proof pressure transmitter, characterized in that, Includes a plug socket (10), a locking nut (20), a mating plug (30), an adapter (40), a compression nut (50), a hose (60), a first sealing assembly (70), and a second sealing assembly (80); The mounting end of the plug-in socket (10) is integrally connected to the transmitter body (1); One end of the locking nut (20) is rotatably connected to the outer periphery of the plug socket (10), and the other end is away from the plug socket (10); The female end of the connector (30) is plugged into the male end of the transmitter body (1), and its male end is integrally connected to the cable (2) body. The periphery of the female end of the connector (30) is screwed into a section of the locking nut (20) away from the plug socket (10). One end of the adapter (40) is screwed to the outer periphery of the male end of the mating plug (30); The clamping nut (50) is screwed onto the end of the adapter (40) away from the mating plug (30); One end of the hose (60) is circumferentially embedded between the clamping nut (50) and the adapter (40); The first sealing assembly (70) is located inside the adapter (40) and is used to cut off the fluid flowing from the adapter (40) to the docking plug (30); The second sealing component (80) is located inside the hose (60) and is fixed to the movable end of the first sealing component (70). The working end of the second sealing component (80) can approach or move away from the periphery of the cable (2) to cut off the fluid flowing from the hose (60) to the adapter (40).

2. The explosion-proof cable outlet device for an explosion-proof pressure transmitter according to claim 1, characterized in that, The inner side of the adapter (40) is provided with a conical movable chamber (401) and an annular groove (402) for accommodating the first sealing assembly (70). The narrow diameter end of the movable chamber (401) faces the side where the docking plug (30) is located. The outer diameter of the narrow diameter end of the movable chamber (401) is consistent with the inner diameter of the docking plug (30). The annular groove (402) is adjacent to the movable chamber (401).

3. The explosion-proof cable outlet device for an explosion-proof pressure transmitter according to claim 2, characterized in that, The first sealing assembly (70) includes a sealing block (71), a compression washer (72), a compression block (73), and a sealing ring (74). The tapered sealing block (71) is slidably disposed in the movable chamber (401), and the midpoint of the inclined surface of the sealing block (71) is on the same plane as the narrow-diameter end vertex of the movable chamber (401); The compression washer (72) is embedded in the annular groove (402), and the inner diameter of the compression washer (72) is smaller than the outer diameter of the wide end of the sealing block (71); The clamping block (73) is slidably disposed at one end of the adapter (40) near the hose (60). The inner side of the clamping block (73) has a light hole (731) coaxially passing through it for accommodating the cable (2). The end face of the clamping block (73) near the hose (60) is in contact with the sealing ring (74). The sealing ring (74) is placed between the hose (60) and the adapter (40), and the inner diameter of the sealing ring (74) is smaller than the outer diameter of the end of the clamping block (73) near the hose (60).

4. The explosion-proof cable outlet device for an explosion-proof pressure transmitter according to claim 3, characterized in that, The hose (60) has a slide (601) arranged axially inside for accommodating the second sealing assembly (80), and the clamping block (73) also has a through hole (732) for accommodating the traction rope (85) of the second sealing assembly (80). The slide (601) is parallel to the axis of the through hole (732), and the axis of the slide (601) is located in the inner diameter region of the clamping washer (72).

5. The explosion-proof cable outlet device for an explosion-proof pressure transmitter according to claim 4, characterized in that, The second sealing assembly (80) includes two sealing units mirror-arranged inside the hose (60), the working ends of the two sealing units being able to approach or move away from the periphery of the cable (2), and the sealing unit includes a fixed rod (81), a rotating block (82), a valve plate (83), and a connecting arm (84). The fixing rod (81) is fixed in the mounting groove (602) of the hose (60), the width direction of the mounting groove (602) is consistent with the radial direction of the hose (60), and the axial length direction of the fixing rod (81) is consistent with the width direction of the mounting groove (602). The rotating block (82) is coaxially disposed around the periphery of the fixed rod (81); The valve plate (83) is slidably disposed on the inner side of the hose (60). The length direction of the valve plate (83) is consistent with the radial direction of the hose (60). One side of the valve plate (83) forms a tooth meshing transmission with the rotating block (82). The end of the valve plate (83) near the axis of the hose (60) abuts against the periphery of the cable (2). One end of the connecting arm (84) is fixed to the periphery of the rotating block (82), and the other end of the connecting arm (84) is turned outward toward the end of the hose (60) away from the through hole (732). The vertex of the end of the connecting arm (84) away from the rotating block (82) is in the same plane as the axis of the slide (601). One end of the traction rope (85) is fixed to the end of the sealing block (71) away from the docking plug (30), and the other end is fixed to the top of the connecting arm (84).

6. The explosion-proof cable outlet device for an explosion-proof pressure transmitter according to claim 5, characterized in that, The mounting groove (602) is provided with a groove (603) for accommodating the valve plate (83) on the side near the slide rail (601). The groove (603) is connected to the mounting groove (602). The inner wall of the groove (603) is slidably engaged with the circumferential surface of the valve plate (83). The bottom of the groove (603) is spaced apart from the slide rail (601). The depth of the groove (603) is greater than the distance between the end of the valve plate (83) and the periphery of the cable (2).

7. The explosion-proof cable outlet device for an explosion-proof pressure transmitter according to claim 5, characterized in that, The rotating block (82) is provided with a plurality of racks (821) around its periphery, and the valve plate (83) is provided with a plurality of grooves (831) on one side near the mounting groove (602), and at least one of the racks (821) has its periphery abutting against the inner wall of the corresponding groove (831).

8. The explosion-proof cable outlet device for an explosion-proof pressure transmitter according to claim 7, characterized in that, The length of the plurality of racks (821) is equal to the sum of the lengths of the plurality of tooth grooves (831).

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