An emergency release system for cryogenic fluid delivery pipe

Abstract

The present application relates to the technical field of ship-borne cryogenic fluid conveying equipment, and in particular to an emergency release system for cryogenic fluid conveying pipes, which is composed of a valve mechanism, a locking mechanism, a driving mechanism, and a hydraulic system. The hydraulic system also includes a hydraulic motor branch A and a hydraulic cylinder branch B. The hydraulic motor branch A is connected to the driving mechanism 3, and the driving mechanism is connected to the valve mechanism. The hydraulic motor drives the worm gear to drive the double ball valve to realize the opening and closing of the valve. The locking mechanism is unlocked by the hydraulic cylinder, and the valve mechanism and the locking mechanism can be controlled in steps. The worm gear driving mechanism has the characteristics of large transmission ratio, compact structure, self-locking, strong bearing capacity, etc. At the same time, it realizes the requirements of automatic opening and closing of the double ball valve, without the need for manual opening by the operating personnel. The structure is simple, safe and reliable.

Description

Technical Field

[0001] The present application relates to the technical field of ship-mounted cryogenic fluid transport equipment, and in particular to an emergency release system for a cryogenic fluid transport pipe. Background Art

[0002] LNG unloading arm is an important industrial equipment in the LNG transportation process, also known as LNG loading and unloading arm or cryogenic fluid loading and unloading arm. It can be divided into land unloading arm and ship unloading arm according to the installation location. The land unloading arm is an important component of the LNG receiving station. It is installed on the LNG receiving station wharf, controlled to connect with the pipeline of the LNG carrier, and LNG is transmitted through the internal articulated pipeline to complete the medium transmission between the LNG storage tank and the LNG ship. The ship loading and unloading arm is a loading and unloading equipment installed on the LNG carrier. It realizes the transmission of LNG like the land loading and unloading arm. The characteristic is that installing it on the LNG carrier can improve the transmission efficiency and shorten the operation time.

[0003] The emergency release device is an important component to improve the safety factor of the LNG unloading arm. By installing the emergency release device, the pipeline of the LNG unloading arm can be disconnected from the flange pipeline of the ship in time when an emergency such as fire, explosion, stormy weather occurs, which not only ensures the safety of the LNG carrier, but also ensures that the LNG unloading arm will not be pulled and damaged by the LNG carrier, thus improving the safety of LNG transportation operations.

[0004] However, the current traditional emergency release device in China is only driven by a hydraulic cylinder, which cannot realize the step-by-step opening and closing of the valve mechanism and the locking mechanism. In addition, the valve mechanism of most emergency release devices is a cam plus two-section push rod structure, which can only close the valve but cannot open the valve, requiring operators to open it manually. In addition, the emergency release device mechanism is relatively complicated and inconvenient to install and maintain. Summary of the invention

[0005] To solve the above problems, the present application provides an emergency release system for a cryogenic fluid delivery pipe, which is provided with a valve mechanism, a locking mechanism, a driving mechanism, and a hydraulic system. The hydraulic system is provided with a hydraulic pump, a relief valve, and a three-position three-way solenoid reversing valve. The hydraulic system also includes a hydraulic motor branch and a hydraulic cylinder branch. The hydraulic motor branch is provided with two first hydraulically controlled one-way valves, a first three-position four-way solenoid reversing valve, a first speed regulating valve, and a hydraulic motor; the hydraulic cylinder branch is provided with two second hydraulically controlled one-way valves, a second three-position four-way solenoid reversing valve, a second speed regulating valve, and a hydraulic cylinder.

[0006] In one embodiment, the three-position three-way electromagnetic reversing valve is connected to the oil inlet of the hydraulic motor branch and the hydraulic cylinder branch, and the working sequence of the emergency release device is controlled by adjusting the valve core position;

[0007] The first hydraulically controlled one-way valve and the second hydraulically controlled one-way valve form a hydraulic locking circuit;

[0008] The first three-position four-way electromagnetic reversing valve and the second three-position four-way reversing valve realize the forward and reverse rotation of the hydraulic motor and the extension and retraction action of the hydraulic cylinder;

[0009] The first speed regulating valve and the second speed regulating valve control the running speed of the actuator.

[0010] In one embodiment, the hydraulic motor branch is connected to the driving mechanism, the driving mechanism is connected to the valve mechanism, and the hydraulic cylinder branch is connected to the locking mechanism.

[0011] In one embodiment, the valve mechanism includes a first ball valve and a second ball valve, the first ball valve and the second ball valve are connected via a flange, and the locking mechanism is located at an outer edge of the flange.

[0012] In one embodiment, the driving mechanism includes the hydraulic motor, and a first worm gear reducer and a second worm gear reducer are arranged at the output end of the hydraulic motor. The first worm gear reducer and the second worm gear reducer are symmetrically installed on the valve stems of the first ball valve and the second ball valve respectively.

[0013] In one embodiment, the locking mechanism is provided with a first clamp and a second clamp, the second clamp is provided with a locking rod, the top of the locking rod is provided with a locking nut, the first clamp is provided with a locking groove, the hydraulic cylinder is provided on the first clamp, the top of the hydraulic cylinder is provided with a Y-shaped joint, and the opening direction of the Y-shaped joint is the same as the opening direction of the locking groove.

[0014] In one embodiment, the first worm gear reducer and the second worm gear reducer have the same structure and are provided with a reducer housing, wherein a worm wheel and a worm are provided inside the reducer housing.

[0015] In one embodiment, the ends of the first clamp and the second clamp are respectively provided with clamp pins, and the first clamp and the second clamp are movably connected together by a positive and negative thread nut and a movable bolt between the two clamp pins.

[0016] The beneficial effects of this application are:

[0017] The present application discloses an emergency release system for a cryogenic fluid delivery pipe, which is provided with a valve mechanism, a locking mechanism, a driving mechanism, and a hydraulic system. The hydraulic system also includes a hydraulic motor branch and a hydraulic cylinder branch. The hydraulic motor branch is connected to the driving mechanism, which is connected to the valve mechanism to drive the valve to open and close. The hydraulic cylinder branch is connected to the locking mechanism to drive the locking mechanism to unlock and realize step-by-step control of the valve mechanism and the locking mechanism. The worm gear driving mechanism has the characteristics of large transmission ratio, compact structure, self-locking, strong bearing capacity, etc. At the same time, it realizes the requirement of automatic opening and closing of the double ball valve without the need for manual opening by the operating personnel. The clamp locking mechanism is realized by self-locking of the thread, and the required parts are few. Moreover, the unlocking process only needs to push out the hydraulic cylinder lever to realize the simple structure, safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of this application;

[0019] Figure 2 This is a side view of the application;

[0020] Figure 3 It is a schematic diagram of the locking mechanism structure;

[0021] Figure 4 is a top view of the locking mechanism;

[0022] Figure 5 Schematic diagram of the worm gear reducer structure;

[0023] Figure 6 for Figure 5 AA view;

[0024] Figure 7 Schematic diagram of the hydraulic system.

[0025] Explanation of symbols in the figure:

[0026] 1. Valve mechanism; 101. First ball valve; 102. Second ball valve; 103. Flange;

[0027] 2. Locking mechanism; 201. First clamp; 202. Second clamp; 203. Clamp groove; 204. Locking rod; 205. Locking nut; 206. Locking groove; 207. Hydraulic cylinder; 208. Y-type joint; 209. Locking pin; 210. Clamp pin; 211. Front and back thread nut; 212. Visible bolt;

[0028] 3. Driving mechanism; 301. Hydraulic motor; 302. First worm gear reducer; 303. Second worm gear reducer; 304. Hydraulic motor bracket; 305. Double diaphragm coupling; 306. Worm coupling; 307. Reducer housing; 308. Worm wheel; 309. Worm;

[0029] 4. Hydraulic system; 401. Oil filter; 402. Hydraulic pump; 403. Overflow valve; 404. Three-position three-way electromagnetic reversing valve;

[0030] 410. First hydraulically controlled one-way valve; 411. First three-position four-way solenoid reversing valve; 412. First speed regulating valve; 420. Second hydraulically controlled one-way valve; 421. Second three-position four-way solenoid reversing valve; 422. Second speed regulating valve. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] like Figure 1 , 2 As shown in , 7, an emergency release system for a cryogenic fluid conveying pipe, the emergency release system is provided with a valve mechanism 1, the valve mechanism 1 includes a first ball valve 101 and a second ball valve 102, the first ball valve 101 and the second ball valve 102 are connected via a flange 103, a locking mechanism 2 is provided on the outer edge of the flange 103, a driving mechanism 3 is also provided on one side of the valve mechanism 1, the driving device 3 can drive the valve mechanism 1 to open or close, the emergency release device is also provided with a hydraulic system 4, the hydraulic system 4 is respectively connected to the locking mechanism 2 and the driving mechanism 3.

[0033] like Figure 3 , 4 As shown, the locking mechanism 2 includes a first clamp 201 and a second clamp 202, a clamp groove 203 is provided between the first clamp 201 and the second clamp 202, the clamp groove 203 is matched with the flange 103 to achieve locking of the flange 103; the first clamp 201 and the second clamp 202 are hinged, a locking rod 204 is movably provided on the second clamp 202, a locking nut 205 is provided on the top of the locking rod 204, a locking groove 206 is provided on the first clamp 201, and a hydraulic cylinder 207 is also provided on the first clamp 201, a Y-type joint 208 is provided on the top of the piston of the hydraulic cylinder 207, the opening direction of the Y-type joint 208 is the same as the opening direction of the locking groove 206, when the locking rod 204 is snapped into the locking groove 206, part of the locking rod 204 is snapped into the Y-type joint 208.

[0034] like Figure 3 , 4 As shown, a locking pin 209 is also provided in the locking groove 205 .

[0035] like Figure 3 , 4 As shown, the ends of the first clamp 201 and the second clamp 202 are respectively provided with clamp pins 210 , and the first clamp 201 and the second clamp 202 are movably connected together by a positive and negative thread nut 211 and a movable bolt 212 between the two clamp pins 210 .

[0036] like Figure 1 , 2 As shown in Figures 5 and 6, the driving mechanism 3 is provided with a hydraulic motor 301, and the output end of the hydraulic motor 301 is provided with a first worm gear reducer 302 and a second worm gear reducer 303. The first worm gear reducer 302 and the second worm gear reducer 303 are symmetrically mounted on the valve stems of the first ball valve 101 and the second ball valve 102, respectively. The valve stems of the first ball valve 101 and the second ball valve 102 are fixedly connected to the valve core of the first ball valve 101 and the valve core of the second ball valve 102, respectively. The hydraulic motor 301 is actuated to drive the first worm gear reducer 302 and the second worm gear reducer 303 to actuate, thereby realizing the opening or closing of the first ball valve 101 and the second ball valve 102.

[0037] The valve mechanism 3 is provided with a hydraulic motor bracket 304 , and the hydraulic motor 301 is fixedly arranged on the hydraulic motor bracket 304 .

[0038] The output end of the hydraulic motor 301 is provided with a double diaphragm coupling 305 and a worm coupling 306 in sequence.

[0039] The first worm gear reducer 302 and the second worm gear reducer 303 have the same structure and are provided with a reducer housing 307 , wherein a worm wheel 308 and a worm 309 are provided inside the reducer housing 307 .

[0040] like Figure 7 As shown, the hydraulic system 4 has two hydraulic circuits, one connected to the hydraulic motor 301 and the other connected to the hydraulic cylinder 207, forming a hydraulic motor branch A and a hydraulic cylinder branch B. In the two branches, the hydraulic motor 301 and the hydraulic cylinder 207 are controlled respectively.

[0041] The hydraulic system 4 is provided with an oil filter 401, a hydraulic pump 402, and a relief valve 403. In order to prevent the actuator from moving under the action of external force, a hydraulic valve is provided in the hydraulic system 4 to lock the branch. The hydraulic motor branch A and the hydraulic cylinder branch B respectively use a hydraulic locking circuit composed of two first hydraulically controlled one-way valves 410 and two second hydraulically controlled one-way valves 420 to respectively lock the double ball valve and the locking mechanism. The reversing valves in the hydraulic motor branch A and the hydraulic cylinder branch B respectively use the first three-position four-way electromagnetic reversing valve 411 and the second three-position four-way reversing valve 421. The forward and reverse rotation of the hydraulic motor 301 and the telescopic action of the hydraulic cylinder 207 can be achieved by controlling the electromagnets on the left and right sides, thereby solving the problem of opening the double ball valve and restoring the locking device in the emergency release device. The middle position function of the reversing valve is Y-type, which can ensure that both hydraulic branches are connected to the oil tank, and ensure that the hydraulic lock can function normally. For the problem of the action sequence of the hydraulic cylinder 207 and the hydraulic motor 301, a three-position three-way electromagnetic reversing valve 404 is used, and the oil inlets of the two branches A and B are connected to the three-position three-way electromagnetic reversing valve 404. By controlling the valve core position of the three-position three-way electromagnetic reversing valve 404, the normal working sequence of the emergency release device is realized. In the two branches, the first speed regulating valve 412 and the second speed regulating valve 422 are respectively added to control the running speed of the actuator to avoid interference from the load and affect the running speed.

[0042] When the hydraulic system is working, the oil is input from the oil tank into the hydraulic system through the hydraulic pump 402. First, the electromagnet at the left end of the three-position three-way electromagnetic reversing valve 404 is energized, and the three-position three-way electromagnetic reversing valve 404 is reversed and placed in the left position. The oil passes through the first speed regulating valve 412, the first three-position four-way electromagnetic reversing valve 411 and the hydraulic lock (composed of two first hydraulically controlled one-way valves 410) to reach the hydraulic motor 301. When the electromagnet at the left end of the first three-position four-way electromagnetic reversing valve 411 is energized, the first three-position four-way electromagnetic reversing valve 411 is placed in the left position, and the hydraulic motor 301 rotates forward; when the electromagnet at the right end of the first three-position four-way electromagnetic reversing valve 411 is energized, the first three-position four-way electromagnetic reversing valve 411 is placed in the right position, and the hydraulic motor reverses, thereby driving the valve stems of the first ball valve 101 and the second ball valve 102 to rotate, thereby realizing the opening or locking of the valve mechanism 1. When the electromagnet at the right end of the three-position three-way electromagnetic reversing valve 404 is energized, the three-position three-way electromagnetic reversing valve 404 is reversed and placed in the right position, and the oil passes through the second speed regulating valve 422, the second three-position four-way electromagnetic reversing valve 421 and the hydraulic lock (composed of the second hydraulically controlled one-way valve 420) to reach the hydraulic cylinder 207. When the electromagnet at the left end of the second three-position four-way electromagnetic reversing valve 421 is energized, the second three-position four-way electromagnetic reversing valve 421 is placed in the left position, the hydraulic cylinder 207 extends, and the Y-type joint 208 at the top of the hydraulic cylinder 207 supports the end of the locking rod 204, pushing the locking rod 204 out of the locking groove 206, thereby realizing the emergency opening of the locking mechanism 2; when the electromagnet at the right end of the second three-position four-way electromagnetic reversing valve 421 is energized, the second three-position four-way electromagnetic reversing valve 421 is placed in the right position, and the hydraulic cylinder 207 contracts.

[0043] The present application discloses an emergency release system for cryogenic fluid delivery pipes, which is composed of a valve mechanism 1, a locking mechanism 2, a driving mechanism 3, and a hydraulic system 4, and has a simple structure. The hydraulic system 4 also includes a hydraulic motor branch A and a hydraulic cylinder branch B. The hydraulic motor branch A is connected to the driving mechanism 3, and the driving mechanism 3 is connected to the valve mechanism 1. The hydraulic motor 301 drives the worm gear to drive the double ball valve to open and close the valve. The locking mechanism 2 is unlocked by the hydraulic cylinder 207, and the valve mechanism 1 and the locking mechanism 2 can be controlled step by step. The worm gear driving mechanism has the characteristics of large transmission ratio, compact structure, self-locking, strong bearing capacity, etc., and realizes the requirements of automatic opening and closing of the double ball valve, without the need for the operator to manually open it separately. The clamp locking mechanism is realized by self-locking of the thread, and the required parts are few. The unlocking process only requires the hydraulic cylinder lever 207 to be pushed out, and the structure is simple, safe and reliable.

[0044] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

Claims

1. An emergency release system for a cryogenic fluid delivery pipe, provided with a valve mechanism, a locking mechanism, a driving mechanism, and a hydraulic system, wherein the hydraulic system is provided with a hydraulic pump, a relief valve, and a three-position three-way electromagnetic reversing valve, characterized in that: The hydraulic system also includes a hydraulic motor branch and a hydraulic cylinder branch. The hydraulic motor branch is provided with two first hydraulically controlled one-way valves, a first three-position four-way electromagnetic reversing valve, a first speed regulating valve, and a hydraulic motor; the hydraulic cylinder branch is provided with two second hydraulically controlled one-way valves, a second three-position four-way electromagnetic reversing valve, a second speed regulating valve, and a hydraulic cylinder; The three-position three-way electromagnetic reversing valve is connected to the oil inlet of the hydraulic motor branch and the hydraulic cylinder branch, and controls the working sequence of the emergency release device by adjusting the valve core position; The first hydraulically controlled one-way valve and the second hydraulically controlled one-way valve form a hydraulic locking circuit; The first three-position four-way electromagnetic reversing valve and the second three-position four-way reversing valve realize the forward and reverse rotation of the hydraulic motor and the extension and retraction action of the hydraulic cylinder; The first speed regulating valve and the second speed regulating valve control the running speed of the actuator; The hydraulic motor branch is connected to the driving mechanism, the driving mechanism is connected to the valve mechanism, and the hydraulic cylinder branch is connected to the locking mechanism; The valve mechanism comprises a first ball valve and a second ball valve, the first ball valve and the second ball valve are connected via a flange, and the locking mechanism is located at the outer edge of the flange.

2. An emergency release system for a cryogenic fluid delivery pipe according to claim 1, characterized in that: The driving mechanism includes the hydraulic motor, and a first worm gear reducer and a second worm gear reducer are arranged at the output end of the hydraulic motor. The first worm gear reducer and the second worm gear reducer are symmetrically installed on the valve stems of the first ball valve and the second ball valve respectively.

3. The emergency release system for a cryogenic fluid delivery pipe according to claim 1, characterized in that: The locking mechanism is provided with a first clamp and a second clamp, the second clamp is provided with a locking rod, the top end of the locking rod is provided with a locking nut, the first clamp is provided with a locking groove, the hydraulic cylinder is provided on the first clamp, the top end of the hydraulic cylinder is provided with a Y-shaped joint, and the opening direction of the Y-shaped joint is the same as the opening direction of the locking groove.

4. The emergency release system for a cryogenic fluid delivery pipe according to claim 2, characterized in that: The first worm gear reducer and the second worm gear reducer have the same structure and are provided with a reducer housing, wherein a worm wheel and a worm are arranged inside the reducer housing.

5. The emergency release system for cryogenic fluid delivery pipe according to claim 3, characterized in that: The ends of the first clamp and the second clamp are respectively provided with clamp pins, and the first clamp and the second clamp are movably connected together through positive and negative thread nuts and a movable bolt between the two clamp pins.

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