Cable leading-out component for pressure vessel
By designing a cable lead-out component for pressure vessels, including threaded joints and sealing components, the problems of difficulty in cable lead-out and leakage hazards are solved, the functions of high pressure bearing and leakage prevention are achieved, and the cost is reduced.
Patent Information
- Application Number
- CN202420972983.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-07
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-05-07
AI Technical Summary
When measuring shaft displacement and jumping in pressure vessels, cable induced difficulties lead to leakage risks. Existing solutions such as redesigning housings or custom sealed plug joints are costly and inefficient.
Design a cable lead-out component for pressure vessels, including a threaded joint and a sealing assembly. The threaded joint is screwed into the shell through threads. The sealing assembly includes a barrel, a baffle, an adhesive sealing layer and a polymer sealing layer. The design of the baffle and adhesive sealing layer achieves damage-free passage of cables and high sealing.
The cable can be led out from the pressure vessel without damage, and has the functions of high pressure bearing and leakage prevention, which reduces investment costs and avoids the need to redesign the shell or customize the sealed plug connector.
Smart Images
Figure CN222381317U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of cable lead-out, in particular to a cable lead-out component for a pressure vessel. Background Art
[0002] Many electrical equipment in the oil refining, chemical and petrochemical industries are sealed inside pressure vessels, and the operation of electrical equipment is inseparable from the transmission of power or signals through cables, and the position where the cable passes through the shell of the pressure vessel has always been a potential leak point for the pressure vessel. Some high-precision signal lines are not even allowed to be cut and reconnected, and need to pass through the shell of the pressure vessel without loss. For example, in order to ensure the reliability of related equipment, the use of centrifuge products needs to respond to the API-617 standard, which requires the detection of the shaft displacement and shaft runout of the centrifuge. High-precision eddy current displacement sensors are generally used for detection. Eddy current displacement sensors are sensors that use eddy current effects to measure the displacement of objects. Eddy current displacement sensors calculate the displacement of objects by measuring changes in magnetic fields. They have the characteristics of non-contact and accurate measurement. Eddy current displacement sensor probes and eddy current displacement sensor cables are integrated. Eddy current displacement sensor cables cannot be cut arbitrarily, and matching cables must be used, otherwise the output will be very different. High-precision eddy current displacement sensors are used to measure the displacement and runout of centrifuge shafts. Their cables need to be led out from the high-pressure housing of the centrifuge. For refrigeration compressors, the displacement and runout of the shaft inside the compressor need to be measured, which requires precise measurement feedback. However, the distance between the centrifuge shaft and the compressor housing is generally large, and the internal pressure of the compressor is relatively high. It is difficult to lead the eddy current displacement sensor wires out of the housing, otherwise there will be accidents of oil and gas leakage in the compressor.
[0003] In order to measure the displacement of the shaft in accordance with the requirements of the API, the casing of the compressor is redesigned, the probe is fixed on the casing for easy measurement, and the wire is not introduced into the casing.
[0004] There are also eddy current displacement sensor manufacturers who customize sealed plug connector cables, and the plug connectors are equipped with O-rings for sealing.
[0005] However, redesigning the shell is time-consuming, labor-intensive and costly, and the measuring probe is directly fixed on the shell. The shell will deform differently under different operating conditions due to the different internal pressures of the unit, making the measurement accuracy meaningless and easily triggering false judgments.
[0006] Ask the eddy current displacement sensor manufacturer to customize the sealable plug connector cable. Generally, eddy current sensors are used in the detection host computer in the petrochemical plant. The petrochemical industry undergoes centralized testing, so they are generally imported eddy current sensors. For the customized sealed plug connectors of imported eddy current sensors, the original eddy current sensors are expensive, and the customization price is at least doubled, and a certain minimum order quantity is required, and the delivery time is also doubled compared to the normal one. The length of the cable in the customized plug connector cannot be specially specified, so even if it can be customized, it may not meet the expected design. Utility Model Content
[0007] The technical problem to be solved by the utility model is to provide a cable lead-out component for a pressure vessel.
[0008] The specific technical solution of the utility model to solve the above technical problems is:
[0009] A cable lead-out component for a pressure vessel, comprising a threaded joint, an operating portion being provided on the threaded joint, the operating portion being used to rotate the threaded joint with the aid of a tool such as a wrench, and screwing the threaded joint into a threaded hole on a shell of the pressure vessel, a threaded portion being provided at one end of the threaded joint, a through hole being provided inside the threaded joint, the through hole being used for allowing a sensor probe or a connector and / or a cable to pass through, in actual operation, if used for passing through a cable, the size of the through hole only needs to be large enough to pass through the cable, if used for passing through a sensor probe or a connector and a cable, the size of the through hole must be large enough to pass through a sensor probe or a connector or a plug connector of a sensor connecting line; a sealing assembly is provided at the other end of the threaded joint relative to the threaded portion, the sealing assembly The component includes a cylinder fixedly arranged on the threaded joint, and also includes a baffle arranged in the cylinder, an adhesive sealing layer and a polymer sealing layer filled in the cylinder. The baffle is provided with a cable avoidance opening, and the cable avoidance opening is smaller than the through hole inside the threaded joint. The circumscribed circle diameter of the baffle is larger than the through hole diameter inside the threaded joint. After the cable passes through the threaded joint, the cable is inserted into the cable avoidance opening set on the baffle, and the baffle is placed in the cylinder. The baffle will be located at the bottom of the cylinder and abut against the end of the threaded joint. When the adhesive is injected into the cylinder, the uncured adhesive is prevented from flowing into the through hole of the threaded joint. At the same time, the baffle is used to disperse the force of the pressure in the pressure vessel on the adhesive, so that the sealing effect between the cable and the adhesive is better.
[0010] The solution of the utility model can lead the cable out of the pressure vessel without loss, has the functions of high pressure bearing and leakage prevention, avoids the need to redesign the pressure vessel shell or customize a special sealing plug connector, and reduces investment costs.
[0011] Further, the cylinder and the threaded joint are integrally formed;
[0012] The beneficial effect of adopting the above-mentioned further technical solution is to reduce the processing steps of the joint and avoid quality risks caused by secondary welding.
[0013] Furthermore, the cylinder is cylindrical, and the baffle is a circular baffle;
[0014] The beneficial effects of adopting the above further technical solution are that it is easy to install, there is no need to consider the direction when placing the baffle, and it is easy to process.
[0015] Furthermore, the inner wall of the cylinder is a rough surface;
[0016] The beneficial effect of adopting the above further technical solution is that the rough surface increases the adhesion of the adhesive and the polymer filler, thereby enhancing the sealing effect.
[0017] Furthermore, the blocking piece is composed of two pieces, which are staggered and overlapped;
[0018] The beneficial effect of adopting the above further technical solution is that the staggered baffles further reduce the area where the pressure directly acts on the adhesive sealing layer, further disperse the force of the pressure on the adhesive sealing layer, and improve the stability of the joint.
[0019] Furthermore, the baffle is provided with a plurality of cable escape openings;
[0020] The beneficial effect of adopting the above-mentioned further technical solution is that multiple cables can be led out based on one connector, or for multi-core cables, if the gap between the inner core and the outer insulation layer is large and there is a risk of pressure release, the outer insulation layer can be peeled off and each inner core can be sealed and protected separately to prevent pressure from leaking out from the gap between the cable and the cable insulation layer.
[0021] Furthermore, the size of the cable avoidance opening is less than or equal to the outer diameter of the cable;
[0022] The beneficial effect of adopting the above further technical solution is that the size of the avoidance opening is slightly smaller than the outer diameter of the cable itself, and the sealing effect can be further improved by taking advantage of the elasticity of the insulating layer on the surface of the cable.
[0023] Furthermore, the thickness of the adhesive sealing layer and the polymer sealing layer in the barrel extending along the length direction of the cable is not less than 2 cm;
[0024] The beneficial effect of adopting the above further technical solution is to ensure that the adhesive sealing layer and the polymer sealing layer have a sufficiently long effective thickness with the cable and the barrel, thereby ensuring the sealing effect.
[0025] Furthermore, the inner diameter of the opening end of the cylinder is smaller than the inner diameter of the inner cavity of the cylinder, or the inner diameter of the opening end of the cylinder is larger than the inner diameter of the inner cavity of the cylinder.
[0026] The beneficial effect of adopting the above-mentioned further technical scheme is that after the adhesive sealing layer and the polymer sealing layer are cured, when the pressure in the pressure vessel is high pressure, the adhesive sealing layer and the polymer sealing layer have a tendency to move outward under the action of the pressure in the pressure vessel, and when the adhesive sealing layer and the polymer sealing layer move from an inner cavity with a larger diameter to an opening with a smaller diameter, the inner wall of the cylinder itself will produce a circumferential inward force on them, thereby further improving the sealing effect; or, when the pressure vessel is vacuum, the adhesive sealing layer and the polymer sealing layer have a tendency to move inward under the action of external pressure, and when the adhesive sealing layer and the polymer sealing layer move from an opening with a larger diameter to an inner cavity with a smaller diameter, the inner wall of the cylinder itself will produce a circumferential inward force on them, thereby further improving the sealing effect.
[0027] Furthermore, the inner diameters of the two ends of the cylinder are small, and the diameter of the middle inner cavity is large.
[0028] The beneficial effect of adopting the above-mentioned further technical solution is that the inner diameter at both ends is small and the inner diameter in the middle is large. When the adhesive sealing layer and the polymer sealing layer are cured, they have a tendency to move outward (or inward) under the action of the pressure (or vacuum) in the pressure vessel. When the adhesive and polymer move from the larger inner cavity to the smaller opening, the inner wall of the cylinder itself will exert a circumferential inward force on them, thereby further improving the sealing effect.
[0029] Furthermore, the open end of the cylinder is also provided with a thread, and also includes an end cover provided with a cable escape opening, and the end cover is arranged on the open end of the cylinder through a thread.
[0030] The beneficial effect of adopting the above-mentioned further technical solution is to limit the adhesive sealing layer and the polymer sealing layer at the open end of the cylinder to prevent the adhesive sealing layer and the polymer sealing layer from detaching from the open end of the cylinder under the action of the internal pressure of the pressure vessel, causing sealing failure. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] Figure 1 This is a structural schematic diagram of a cable lead-out component for a pressure vessel according to Embodiment 1 of the utility model;
[0032] Figure 2 It is a structural schematic diagram of a baffle of a cable lead-out component for a pressure vessel according to the utility model;
[0033] Figure 3 It is a schematic diagram of the structure of the eddy current displacement sensor involved in the embodiment of the utility model;
[0034] Figure 4 This is a schematic diagram of the installation of a cable lead-out component for a pressure vessel according to Embodiment 1 of the utility model;
[0035] Figure 5 This is a structural schematic diagram of a cable lead-out component for a pressure vessel according to Embodiment 2 of the utility model;
[0036] Figure 6 This is a schematic structural diagram of a cable lead-out component for a pressure vessel according to Embodiment 3 of the utility model;
[0037] Figure 7 This is a schematic structural diagram of a cable lead-out component for a pressure vessel according to Example 4 of the utility model.
[0038] In the accompanying drawings, the component names represented by the reference numerals are listed as follows:
[0039] 10. Threaded joint; 11. Operating part; 12. Threaded part; 13. Cylinder; 131. Open end; 14. Baffle; 141. Cable avoidance; 15. Adhesive sealing layer; 16. Polymer sealing layer; 20. Eddy current displacement sensor; 21. Probe; 22. Plug connector; 23. Cable. DETAILED DESCRIPTION
[0040] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.
[0041] The eddy current displacement sensor 20 in the embodiment of the utility model is as follows Figure 3 As shown, the eddy current displacement sensor 20 includes a probe 21, a plug connector 22 and a cable 23. Since the signal of the eddy current displacement sensor 20 is very weak, the probe 21 and the cable 23 of the eddy current displacement sensor 20 are integrated when leaving the factory. The cable 23 of the eddy current displacement sensor 20 cannot be arbitrarily cut and connected, and a matching cable 23 must be used, otherwise the output will be very different.
[0042] Example 1
[0043] like Figure 1-4 As shown, a cable lead-out component for a pressure vessel includes a threaded joint 10, on which an operating portion 11 is provided, and the operating portion 11 is hexagonal and is used to rotate the threaded joint 10 with the help of a tool such as a wrench, and screw the threaded joint 10 into a threaded hole on a pressure vessel shell. One end of the threaded joint 10 is provided with a threaded portion 12, and a through hole is provided inside the threaded joint 10, and the through hole is used to pass a probe 21 or a plug connector 22 and a cable 23 of a power eddy current displacement sensor 20; the other end of the threaded joint 10 relative to the threaded portion 12 is provided with a sealing assembly, and the sealing assembly includes a circular cylinder 13 integrally formed with the threaded joint 10, and also includes a baffle 14 arranged in the cylinder 13, an adhesive sealing layer 15 filled in the cylinder 13, and a polymer sealing layer 16.
[0044] The inner surface of the cylinder 13 is subjected to a pattern grinding process to improve the roughness and increase the adhesion when the adhesive and polymer are subsequently injected;
[0045] See also Figure 2 The baffle 14 is a circular hard sheet with a cable avoidance opening 141, which can be made of plastic, such as PVC, or can also be made of metal. The cable avoidance opening 141 is a U-shaped notch. The diameter of the U-shaped bottom arc of the cable avoidance opening 141 is smaller than the diameter of the through hole inside the threaded joint 10. The diameter of the U-shaped bottom arc of the cable avoidance opening 141 is smaller than or equal to the outer diameter of the cable 23. The diameter of the baffle 14 is larger than the diameter of the through hole inside the threaded joint 10. After the probe 21 and the cable 23 of the eddy current displacement sensor 20 pass through the threaded joint 10, the cable 23 is inserted into the cable avoidance opening 141 set on the baffle 14. Preferably, two baffles 14 are respectively inserted into the cables 23, and then the baffles 14 are rotated to avoid the U-shaped arcs of the two baffles 14. The cable avoidance opening 141 overlaps, so that the baffle 14 isolates the inner cavity of the cylinder 13 and the through-hole part of the threaded joint 10 to the greatest extent. The two baffles 14 with adjusted angles are placed in the cylinder 13, moved to the bottom of the cylinder 13, and abutted against the end of the threaded joint 10. Next, a certain amount of adhesive is injected into the cylinder 13, and the adhesive is waited for to solidify to form a flexible adhesive sealing layer 15. The amount of adhesive injected ensures that the thickness of the adhesive sealing layer 15 along the length direction of the cable reaches 2 cm or more. The baffle 14 is provided to prevent uncured adhesive from flowing into the through-hole of the threaded joint 10. At the same time, the baffle 14 disperses the pressure in the pressure vessel on the adhesive sealing layer 15, so that the sealing effect between the cable 23 and the adhesive sealing layer 15 is better. After the adhesive is cured, the basic sealing effect has been achieved. At this time, the polymer material is filled into the cylinder 13. After the polymer solidifies, a polymer sealing layer 16 is formed. The thickness of the polymer sealing layer 16 along the length direction of the cable can reach 2 cm or more. At this time, the sealing structure has good sealing, high strength, high pressure resistance and high vacuum resistance.
[0046] It is best to provide an end cover with a cable avoidance opening (not shown in the figure) at the open end 131 of the cylinder 13, and set the end cover on the cylinder 13 through threads to prevent the adhesive sealing layer 15 and the polymer sealing layer 16 from falling off from the cylinder 13 when the internal pressure of the pressure vessel is very high, resulting in sealing failure.
[0047] Example 2
[0048] like Figure 5 As shown, based on Example 1, this embodiment is a cable lead-out component for a pressure vessel, and the inner diameter of the opening end 131 of the cylinder 13 is smaller than the inner cavity diameter of the cylinder 13.
[0049] Example 3
[0050] like Figure 6 As shown, based on Example 1, this embodiment is a cable lead-out component for a pressure vessel, and the inner diameter of the opening end 131 of the cylinder 13 is larger than the inner cavity diameter of the cylinder 13.
[0051] Example 4
[0052] like Figure 7 As shown, on the basis of Example 1, a cable lead-out component for a pressure vessel in this embodiment has small inner diameters at both ends of the cylinder 13 and a large inner diameter in the middle, and is shuttle-shaped. After the adhesive and polymer to be filled are solidified, under the action of external pressure, whether they are squeezed inward or outward, since the adhesive sealing layer 15 is flexible, the inner wall of the cylinder 13 will generate a circumferential inward squeezing force on the adhesive sealing layer 15 and the polymer sealing layer 16, thereby improving the sealing effect.
[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.
Claims
1. A cable lead-out component for a pressure vessel, comprising a threaded joint, wherein the threaded joint is provided with an operating portion, wherein the operating portion is used to rotate the threaded joint by means of a tool, wherein: A through hole is provided inside the threaded joint, and the through hole is used for the probe or connector and cable of the power eddy current displacement sensor to pass through. A threaded portion is provided at one end of the threaded joint, and a sealing assembly is provided at the other end of the threaded joint relative to the threaded portion. The sealing assembly includes a cylinder fixedly arranged on the threaded joint, and also includes a baffle arranged in the cylinder, an adhesive sealing layer and a polymer sealing layer filled in the cylinder. A cable avoidance opening is provided on the baffle, and the cable avoidance opening is smaller than the through hole inside the threaded joint, and the circumscribed circle diameter of the baffle is larger than the diameter of the through hole inside the threaded joint.
2. The cable lead-out component for a pressure vessel according to claim 1, characterized in that: The cylinder is integrally formed with the threaded joint.
3. The cable lead-out component for a pressure vessel according to claim 2, characterized in that: The cylinder body is cylindrical, and the baffle is a circular baffle.
4. The cable lead-out component for a pressure vessel according to any one of claims 1 to 3, characterized in that: The inner wall of the cylinder is a rough surface.
5. The cable lead-out component for a pressure vessel according to any one of claims 1 to 3, characterized in that: The blocking piece consists of two pieces, which are arranged in a staggered and overlapping manner.
6. The cable lead-out component for a pressure vessel according to claim 5, characterized in that: The baffle is provided with a plurality of cable escape openings.
7. The cable lead-out component for a pressure vessel according to any one of claims 1 to 3, characterized in that: The size of the cable escape opening is less than or equal to the outer diameter of the cable.
8. The cable lead-out component for a pressure vessel according to any one of claims 1 to 3, characterized in that: The thickness of the adhesive sealing layer and the polymer sealing layer in the cylinder extending along the length direction of the cable is not less than 2 cm.
9. The cable lead-out component for a pressure vessel according to any one of claims 1 to 3, characterized in that: The inner diameter of the opening end of the cylinder is smaller than the inner diameter of the inner cavity of the cylinder, or the inner diameter of the opening end of the cylinder is larger than the inner diameter of the inner cavity of the cylinder.
10. The cable lead-out component for a pressure vessel according to claim 9, characterized in that: The open end of the cylinder is also provided with a thread, and also includes an end cover provided with a cable escape opening, and the end cover is arranged on the open end of the cylinder through a thread.