Built-in emergency shut-off device for liquefied gas tanks

Abstract

The present invention is a built-in emergency cut-off device for a liquefied gas storage tank, and relates to the technical field of safety protection of liquefied gas storage tanks, and in particular to a built-in emergency cut-off device for safety protection of liquefied gas storage tanks. The present invention comprises: an exhaust channel, a fluid drive device, a built-in valve body, an external opening and closing control valve, a storage tank root pipe and an external stop valve; the external opening and closing control valve is installed on the bottom tank wall of the liquefied gas storage tank; the built-in valve body is fixedly installed on the tank internal interface of the storage tank root pipe; the external stop valve (18) is fixedly installed on the tank external interface of the storage tank root pipe (17); the bottom end of the exhaust channel is connected to the external opening and closing control valve, and the top end is placed in the gas phase space at the top of the liquefied gas storage tank; the fluid drive device is installed on the exhaust channel and connected to the built-in valve body. The technical solution of the present invention solves the problems in the prior art that the traditional root valve is easily affected by the outside world and leaks and fails, and the valve opening and closing control is complex and has poor reliability.

Description

Technical Field

[0001] The invention discloses a built-in emergency cut-off device for a liquefied gas storage tank, relates to the technical field of safety protection of liquefied gas storage tanks, and in particular to a built-in emergency cut-off device for safety protection of liquefied gas storage tanks. Background Art

[0002] The internal medium of the liquefied gas storage tank is characterized by high pressure, flammability and explosion. Once a leak occurs and cannot be stopped in time, it is very likely to cause combustion and explosion.

[0003] The root valve of the liquefied gas storage tank is installed on the root pipeline. It is the last barrier to prevent the leakage of the tank. Its importance is self-evident. At present, the root valve technology of the tank is relatively traditional. Most of the driving methods rely on manpower, hydraulic system, pneumatic or electric and combination methods. The valve has defects such as cumbersome operation, high failure rate and dependence on power supply. In the event of an accident, its own accident hazards and inefficient operation process often lead to the obvious lack of emergency function of the tank, resulting in the expansion of the scale of the accident.

[0004] In addition, the root valve itself also has a greater risk of leakage. Once the root valve is not sealed tightly or leaks due to accidental collision, external fire, etc., it will bring great pressure to emergency response.

[0005] Through the above analysis, the traditional root valve of the current liquefied gas storage tank is easily affected by the outside world and leaks and fails, and the valve opening and closing control is complex and the reliability needs to be improved.

[0006] In view of the problems existing in the above-mentioned prior art, it is very necessary to study and design a new type of built-in emergency shut-off device for liquefied gas storage tanks to overcome the problems existing in the prior art. Summary of the invention

[0007] According to the technical problems of the above-mentioned prior art that the traditional root valve is easily affected by the outside world and leaks and fails, and the valve opening and closing control is complicated and has poor reliability, a built-in emergency shut-off device for liquefied gas storage tanks is provided. The present invention mainly utilizes a fluid drive device and a built-in valve body to drive the automatic opening and closing of an external opening and closing control valve, thereby realizing automatic and rapid shut-off in an emergency and ensuring the safety of the storage tank.

[0008] The technical means adopted by the present invention are as follows:

[0009] A built-in emergency shut-off device for a liquefied gas storage tank comprises: an exhaust passage, a fluid drive device, a built-in valve body, an external opening and closing control valve, a storage tank root pipe and an external stop valve;

[0010] Furthermore, the external opening and closing control valve is installed on the bottom tank wall of the liquefied gas storage tank;

[0011] Furthermore, the built-in valve body is fixedly mounted on the inner interface of the tank root pipe;

[0012] Furthermore, the external stop valve is fixedly mounted on the external tank interface of the tank root pipe;

[0013] Furthermore, the bottom end of the exhaust channel is connected to an external opening and closing control valve, and the top end is placed in the gas phase space at the top of the liquefied gas storage tank;

[0014] Further, the fluid driving device is installed on the exhaust passage and connected to the built-in valve body;

[0015] Furthermore, the external on-off control valve controls the opening / closing of the fluid driving device by opening / closing the exhaust channel, thereby driving the movement of the built-in valve body to achieve the output and closing of the liquefied gas in the liquefied gas storage tank.

[0016] Further, the exhaust passage includes: a main pipe, a branch pipe A and a branch pipe B;

[0017] Furthermore, the top end of the main pipe is located in the gas phase space of the liquefied gas storage tank; the bottom end is connected to the top ends of the branch pipes A and B through a tee;

[0018] Furthermore, the bottom ends of branch pipe A and branch pipe B are fixed on the bottom end wall of the liquefied gas storage tank and communicate with the outside of the tank.

[0019] Furthermore, the branch pipe opening should be located in a position that is not easily disturbed by adverse factors (such as collision, fire, etc.) and is easy to operate. For tall liquefied gas storage tanks, the branch pipe opening can be located at the bottom of the tank for ease of operation.

[0020] Furthermore, the external opening and closing control valve includes: an opening control valve structure and a closing control valve structure:

[0021] Further, the opening control valve structure includes: an opening valve, a valve cover seat and a valve cover; the opening valve is mounted on the outer wall of the bottom end of the liquefied gas storage tank and is connected to the branch pipe A; the valve cover seat is mounted on the outer wall of the liquefied gas storage tank outside the opening valve; the valve cover is mounted on the valve cover seat;

[0022] Furthermore, the closing control valve structure includes: a closing valve, a valve cover seat and a valve cover; the closing valve is installed on the outer wall of the bottom end of the liquefied gas storage tank and is connected to the branch pipe B; the valve cover seat is installed on the outer wall of the liquefied gas storage tank outside the closing valve; and the valve cover is installed on the valve cover seat.

[0023] Further, the built-in valve body includes: a central gear, a valve stem, a valve disc, a threaded orifice plate, a liquid outlet section and a valve seat;

[0024] Further, a threaded hole is machined in the center of the threaded hole plate;

[0025] Furthermore, the liquid outlet section is a cylindrical structure, and multiple liquid outlet channels are evenly processed around it;

[0026] Furthermore, a liquid outlet hole is processed in the center of the valve seat;

[0027] Further, the threaded orifice plate, the liquid outlet section and the valve seat are fixedly connected together;

[0028] Furthermore, the valve seat is fixed to the inner section of the tank root pipe by welding;

[0029] Furthermore, a valve disc is fixedly mounted on the bottom end of the valve stem, and a central gear is mounted on the top end; the central gear is connected to the fluid driving device;

[0030] Furthermore, the valve stem is threadedly connected to the threaded orifice plate through the thread in the middle of the stem wall; the axial movement of the valve stem generated by the threaded engagement drives the valve disc to move downward to block the liquid outlet hole on the valve seat.

[0031] Further, the fluid drive device includes: an opening drive device and a closing drive device;

[0032] Furthermore, the opening drive device includes: a fluid motor A, a transmission shaft A and a gear A; the fluid motor A is mounted on the branch pipe A, and its output end is connected to the transmission shaft A, and the transmission shaft A is equipped with a gear A; the gear A is meshed with the central gear;

[0033] Furthermore, the closing drive device includes: a fluid motor B, a transmission shaft B and a gear B; the fluid motor B is mounted on the branch pipe B, and its output end is connected to the transmission shaft B, and the transmission shaft B is equipped with a gear B; the gear B is meshed with the central gear;

[0034] Further, gear A and gear B are arranged in parallel on both sides of the central gear;

[0035] Furthermore, gear A and gear B rotate in opposite directions.

[0036] Furthermore, the contact surface between the valve disc and the liquid outlet hole of the valve seat is a sealing surface.

[0037] Furthermore, in the above settings:

[0038] The central gear and the gears driven by the two fluid motors have the same module and the same tooth angle.

[0039] The threaded orifice plate of the built-in valve body is equal to the valve stem thread angle, nominal diameter and pitch.

[0040] The exhaust channel, the root pipe of the storage tank and the tank wall are sealed by welding.

[0041] The working process of the present invention is as follows:

[0042] When the liquefied gas tank is in normal condition, the valve disc of this emergency shut-off device is in the highest position, the medium in the tank is connected to the external equipment through the liquid outlet section, the root pipe of the storage tank, and the external stop valve, the opening valve and closing valve of this device are closed, and the valve cover is screwed on the valve cover seat through the thread. Since the opening valve and closing valve are small in size, located in a safer position, and protected by the valve cover, the possibility of damage and failure in an accident is much lower than that of other valves.

[0043] When the stop valve outside the liquefied gas storage tank fails or the outside part of the tank root pipe is damaged by external force, resulting in liquefied gas leakage, unscrew the shut-off valve cover and open the shut-off valve. At this time, the gas phase inside the tank is connected to the external atmosphere through the exhaust channel, fluid motor B, and shut-off valve. The high-pressure gas drives the fluid motor B to rotate, and the fluid motor B drives the center gear to rotate through the transmission shaft B and gear B. The center gear drives the valve stem to rotate, and the valve stem cooperates with the thread of the threaded orifice plate, so that the valve stem and the valve disc descend with the rotation of the gear, and then the valve disc presses the sealing surface of the valve seat, thereby closing the liquid outlet pipe channel and preventing the medium from continuing to leak. After the external leakage stops, close the shut-off valve and screw on the valve cover.

[0044] After the root pipeline and external stop valve of the liquefied gas storage tank are repaired, the opening valve is opened. At this time, the gas phase inside the storage tank is connected to the external atmosphere through the exhaust channel, fluid motor A, and the opening valve. The high-pressure gas drives the fluid motor A to rotate, and the fluid motor A drives the central gear to rotate through the transmission shaft A and gear A. The central gear drives the valve stem to rotate, and the valve stem cooperates with the thread of the threaded orifice plate, so that the valve stem and the valve disc rise with the rotation of the gear, and then the valve disc leaves the sealing surface of the valve seat, thereby opening the liquid outlet channel, and the internal part of the storage tank is restored to normal communication with the outside.

[0045] Compared with the prior art, the present invention has the following advantages:

[0046] 1. The built-in emergency cut-off device for liquefied gas storage tanks provided by the present invention is installed on the liquefied gas storage tank and is in an emergency standby state. When the root valve or pipeline of the storage tank leaks, it can be emergency cut off from inside the storage tank to block the continued leakage of the medium and prevent the accident from expanding and escalating;

[0047] 2. The built-in emergency shut-off device for liquefied gas storage tanks provided by the present invention does not rely on any external power, and the internal shut-off device can drive the shut-off valve only by the pressure of the liquefied gas storage tank itself, and the valve is easy to open and close and has fast action;

[0048] 3. The built-in emergency shut-off device for liquefied gas storage tanks provided by the present invention has an emergency shut-off valve body located inside the storage tank, and the only two control valves exposed to the outside are very small in size and protected by valve covers, and are not easily damaged by external forces. The reliability is much higher than that of ordinary external stop valves.

[0049] In summary, the technical solution of the present invention solves the problems in the prior art that the traditional root valve is easily affected by the outside world and leaks and fails, and the valve opening and closing control is complex and has poor reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0051] Figure 1 It is a schematic diagram of the structure of the present invention;

[0052] Figure 2 for Figure 1 A magnified schematic diagram of part A;

[0053] Figure 3 This is a partial assembly diagram of the valve body of the present invention.

[0054] In the figure: 1, liquefied gas storage tank 2, main pipe 3, gear A4, transmission shaft A5, fluid motor A6, central gear 7, fluid motor B8, transmission shaft B9, gear B10, branch pipe A11, branch pipe B12, threaded orifice plate 13, valve stem 14, liquid outlet section 15, valve disc 16, valve seat 17, tank root pipe 18, external stop valve 19, valve cover seat 20, valve cover 21, opening valve 22, closing valve. DETAILED DESCRIPTION

[0055] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0056] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0058] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0059] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0060] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0061] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0062] As shown in the figure, the present invention provides a built-in emergency shut-off device for a liquefied gas storage tank, comprising: an exhaust channel, a fluid driving device, a built-in valve body, an external opening and closing control valve, a storage tank root pipe 17 and an external stop valve 18; the external opening and closing control valve is installed on the bottom tank wall of the liquefied gas storage tank 1; the built-in valve body is fixedly installed on the tank internal interface of the storage tank root pipe 17; the external stop valve is fixedly installed on the tank external interface of the storage tank root pipe 17; the bottom end of the exhaust channel is connected to the external opening and closing control valve, and the top end is placed in the gas phase space at the top of the liquefied gas storage tank 1; the fluid driving device is installed on the exhaust channel and connected to the built-in valve body; the external opening and closing control valve controls the opening / closing of the fluid driving device by opening / closing the exhaust channel, drives the movement of the built-in valve body, and realizes the output and closing of the liquefied gas in the liquefied gas storage tank 1.

[0063] The exhaust channel includes: a main pipe 2, a branch pipe A10 and a branch pipe B11; the top of the main pipe is located in the gas phase space of the liquefied gas storage tank 1; the bottom end is connected to the top of the branch pipe A10 and the branch pipe B11 through a tee; the bottom ends of the branch pipe A10 and the branch pipe B11 are fixed on the bottom end wall of the liquefied gas storage tank 1 and communicate with the outside of the tank.

[0064] The external on-off control valve includes: an opening control valve structure and a closing control valve structure:

[0065] The opening control valve structure includes: an opening valve 21, a valve cover seat 19 and a valve cover 20; the opening valve 21 is mounted on the outer wall of the bottom end of the liquefied gas storage tank 1 and is connected to the branch pipe A10; the valve cover seat 19 is mounted on the outer wall of the liquefied gas storage tank 1 outside the opening valve 21; the valve cover 20 is mounted on the valve cover seat 19;

[0066] The closing control valve structure includes: a closing valve 22, a valve cover seat 19 and a valve cover 20; the closing valve 22 is installed on the outer wall of the bottom end of the liquefied gas storage tank 1 and is connected to the branch pipe B11; the valve cover seat 19 is installed on the outer wall of the liquefied gas storage tank 1 outside the closing valve 22; the valve cover 20 is installed on the valve cover seat 19.

[0067] The built-in valve body includes: a central gear 6, a valve stem 13, a valve disc 15, a threaded orifice plate 12, a liquid outlet section 14 and a valve seat 16; a threaded hole is processed in the center of the threaded orifice plate 12; the liquid outlet section 14 is a cylindrical structure, and a plurality of liquid outlet channels are evenly processed around it; a liquid outlet hole is processed in the center of the valve seat 16; the threaded orifice plate 12, the liquid outlet section 14 and the valve seat 16 are fixedly connected together; the valve seat 16 is fixed to the tank section of the root pipe 17 of the storage tank by welding; the valve disc 15 is fixedly installed at the bottom end of the valve stem 13, and the central gear 6 is installed at the top; the central gear 6 is connected to the fluid drive device; the valve stem 13 is threadedly connected to the threaded orifice plate 12 through the thread in the middle of the stem wall; the axial movement of the valve stem 13 generated by the threaded engagement drives the valve disc 15 to move downward to seal the liquid outlet hole on the valve seat 16.

[0068] The fluid driving device includes: an opening driving device and a closing driving device;

[0069] The opening drive device includes: a fluid motor A5, a transmission shaft A4 and a gear A3; the fluid motor A5 is mounted on the branch pipe A10, and its output end is connected to the transmission shaft A4, and the transmission shaft A4 is equipped with a gear A3; the gear A3 is meshed with the central gear;

[0070] The closing drive device includes: a fluid motor B7, a transmission shaft B8 and a gear B9; the fluid motor B7 is mounted on the branch pipe B11, and its output end is connected to the transmission shaft B8, and the transmission shaft B8 is equipped with a gear B9; the gear B9 is meshed with the central gear;

[0071] Gear A3 and gear B9 are arranged in parallel on both sides of the central gear 6;

[0072] Gear A3 and gear B9 rotate in opposite directions.

[0073] The contact surface between the valve disc 15 and the liquid outlet hole of the valve seat 16 is a sealing surface.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A built-in emergency shut-off device for a liquefied gas storage tank, characterized in that: The built-in emergency shut-off device for a liquefied gas storage tank comprises: an exhaust passage, a fluid drive device, a built-in valve body, an external opening and closing control valve, a storage tank root pipe (17) and an external stop valve (18); The external opening and closing control valve is installed on the bottom tank wall of the liquefied gas storage tank (1); The built-in valve body is fixedly mounted on the inner interface of the tank root pipe (17); the built-in valve body comprises: a central gear (6), a valve stem (13), a valve disc (15), a threaded orifice plate (12), a liquid outlet section (14) and a valve seat (16); a threaded hole is processed at the center of the threaded orifice plate (12); the liquid outlet section (14) is a cylindrical structure, and a plurality of liquid outlet channels are evenly processed around the periphery; a liquid outlet hole is processed at the center of the valve seat (16); the threaded orifice plate (12), the liquid outlet section (14) and the valve seat (16) The valve seat (16) is fixedly connected to the inner section of the tank root pipe (17) by welding; the bottom end of the valve stem (13) is fixedly provided with a valve flap (15), and the top end is provided with a central gear (6); the central gear (6) is connected to the fluid driving device; the valve stem (13) is threadedly connected to the threaded hole plate (12) through the thread in the middle of the stem wall; the axial movement of the valve stem (13) generated by the threaded engagement drives the valve flap (15) to move downward to block the liquid outlet hole on the valve seat (16); The external stop valve (18) is fixedly mounted on the external tank interface of the tank root pipe (17); The bottom end of the exhaust passage is connected to an external opening and closing control valve, and the top end is placed in the gas phase space at the top of the liquefied gas storage tank (1); the exhaust passage comprises: a main pipe (2), a branch pipe A (10) and a branch pipe B (11); the top end of the main pipe (2) is located in the gas phase space of the liquefied gas storage tank (1); the bottom end is connected to the top ends of the branch pipe A (10) and the branch pipe B (11) through a tee; the bottom ends of the branch pipe A (10) and the branch pipe B (11) are fixed to the bottom end wall of the liquefied gas storage tank (1) and communicate with the outside of the tank; The fluid drive device is mounted on the exhaust passage and connected to the built-in valve body; the fluid drive device comprises: an opening drive device and a closing drive device; the opening drive device comprises: a fluid motor A (5), a transmission shaft A (4) and a gear A (3); the fluid motor A (5) is mounted on the branch pipe A (10), and its output end is connected to the transmission shaft A (4), and the transmission shaft A (4) is equipped with a gear A (3); the gear A (3) is meshed with the central gear; the closing drive device comprises: a fluid motor B (7), a transmission shaft B (8) and a gear B (9); the fluid motor B (7) is mounted on the branch pipe B (11), and its output end is connected to the transmission shaft B (8), and the transmission shaft B (8) is equipped with a gear B (9); the gear B (9) is meshed with the central gear; the gear A (3) and the gear B (9) are arranged in parallel on both sides of the central gear (6); the gear A (3) and the gear B (9) rotate in opposite directions; The external opening and closing control valve controls the opening and closing of the fluid driving device by opening and closing the exhaust channel, thereby driving the internal valve body to move, thereby realizing the output and closing of the liquefied gas in the liquefied gas storage tank (1); the external opening and closing control valve comprises: an opening control valve structure and a closing control valve structure; the opening control valve structure comprises: an opening valve (21), a valve cover seat (19) and a valve cover (20); the opening valve (21) is installed on the outer wall of the bottom end of the liquefied gas storage tank (1) and is connected to the branch pipe A (10); the valve The cover seat (19) is mounted on the outer wall of the liquefied gas storage tank (1) outside the opening valve (21); the valve cover (20) is mounted on the valve cover seat (19); the closing control valve structure comprises: a closing valve (22), a valve cover seat (19) and a valve cover (20); the closing valve (22) is mounted on the outer wall of the bottom end of the liquefied gas storage tank (1) and is connected to the branch pipe B (11); the valve cover seat (19) is mounted on the outer wall of the liquefied gas storage tank (1) outside the closing valve (22); and the valve cover (20) is mounted on the valve cover seat (19).

2. The built-in emergency shut-off device for a liquefied gas storage tank according to claim 1, characterized in that: The contact surface between the valve disc (15) and the liquid outlet hole of the valve seat (16) is a sealing surface.

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