Balanced oil gas recovery device for organic solvent

Abstract

The application discloses a balance type oil gas recovery device special for organic solvents, and the expansion body is an elastic bellows which can freely stretch and shrink and will not cause stress and fatigue damage of the expansion body itself. Through volume expansion of the expansion body, displacement is transmitted to a sealing cover which is pressed on a tank opening of a tank car. At the beginning, there is elastic displacement between the sealing cover and the tank opening of the tank car, and with the downward pre-tightening force, the sealing cover is completely pressed on the tank opening of the tank car, and the tank opening of the tank car reaches a tight sealing state. The reset device and the limiting device cooperate to limit the limit stretching and shrinking stroke of the expansion body stretching and shrinking cavity. The stretching and shrinking cavity is ensured to have accommodating space at the beginning, and the stretching and shrinking cavity is ensured to continue to expand at the maximum limit position. The annular framework is formed by pouring foamed rubber, the specific shape of the sealing cover is ensured, the softness of the sealing cover is realized, the foamed rubber body is prevented from reacting with the organic solvent by wrapping a layer of polytetrafluoroethylene, and the sealing performance is good.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas recovery, in particular to a balanced oil and gas recovery device special for organic solvents. BACKGROUND

[0002] Currently, the loading process of gasoline, naphtha and other oil products usually adopts the under-liquid loading mode, that is, the loading crane pipe is inserted into the bottom of the tank truck to transport oil products, and the oil gas is sent to the oil and gas recovery device through the oil and gas collection pipeline on the loading port cover plate. The cover plate on the loading port is usually made of hard rubber, which forms a linear seal with the loading port. Although this can reduce the leakage of oil gas to a certain extent, the linear seal has poor reliability, and the cover plate and the loading port are not absolutely flat, so there must be a gap between the cover plate and the loading port. When the pressure in the tank truck is greater than the atmospheric pressure, the oil gas will escape into the environment; when the oil gas collection pipeline is under negative pressure, the pressure in the tank truck is less than the atmospheric pressure, and then the ambient air enters the oil gas collection pipeline, which is equivalent to dilution emission, increasing the oil gas volume and the operating burden of the oil and gas recovery device.

[0003] The utility model discloses an oil product loading port sealing device and oil product loading device, which comprises a cover plate provided with a through hole for the crane pipe to pass through, a gas collection hood arranged above the cover plate and sealingly connected with the through hole, the gas collection hood being provided with a sealing socket and an oil gas collection pipeline for the crane pipe to pass through, and an annular air bag arranged below the cover plate and surrounding the through hole. The cover plate can press the annular air bag tightly against the loading port to achieve the sealing between the through hole and the loading port. The gap between the cover plate and the loading port during the oil loading process can be eliminated to prevent oil gas from escaping. However, in this structure, the annular air bag directly contacts the loading port, and the intermittent fluctuation of the pre-tightening force is caused when the annular air bag inhales and exhales. Moreover, the oil gas temporarily collected in the annular air bag is prone to backflow into the tank truck, and the annular air bag does not have a minimum and maximum limit volume. In addition, the rubber reacts with the organic solvent during use, which damages the sealing performance and causes the leakage of organic solvent gas. SUMMARY

[0004] To overcome the above-mentioned deficiencies, the present application aims to provide an organic solvent special balanced oil and gas recovery device, which transmits displacement to the sealing cover pressed on the tank truck loading port through the volume expansion of the polytetrafluoroethylene expansion body that does not react with the organic solvent. The elastic displacement exists between the sealing cover and the tank truck loading port at the beginning, and the sealing cover is completely pressed on the tank truck loading port under the pre-tightening force, so that a tight sealing state between the sealing cover and the tank truck loading port is achieved.

[0005] To achieve the above object, the present application provides the following technical solutions: a special balance type oil gas recovery device for organic solvents, comprising an upper connecting piece and a lower connecting piece, and an expansion body made of polytetrafluoroethylene arranged between the upper connecting piece and the lower connecting piece. The expansion body is made of polytetrafluoroethylene, which effectively prevents the expansion body made of organic solvents and other elastic materials from reacting and causing leakage.

[0006] The upper connecting piece, the lower connecting piece and the expansion body form an expansion cavity for collecting and releasing gas. The upper connecting piece and the lower connecting piece are provided with mounting holes and gas collection holes along the central axis, through which a vertical pipe passes. The mounting holes are in sealing engagement with the vertical pipe. The lower connecting piece comprises an upper flange and a lower flange, and a gas collection pipe is arranged between the upper flange and the lower flange. A sealing cover is arranged on the lower side of the lower flange, and the gas collection hole is arranged on the sealing cover. The sealing cover is pressed onto the tank opening of the tank car. The oil gas discharged from the tank opening of the tank car is collected into the expansion body through the gas collection hole and the gas collection pipe in sequence. As the oil gas accumulates, the pressure of the oil gas in the expansion body increases, and the volume of the expansion body expands to generate a counteracting force to increase the pressing force of the sealing cover towards the tank opening of the tank car. The sealing property between the sealing cover and the tank opening of the tank car is continuously enhanced as the pressing force increases. When the pressing force reaches the maximum balance state, the sealing property between the sealing cover and the tank opening of the tank car reaches the pressing sealing state. Through the volume expansion of the expansion body, the displacement is transmitted to the sealing cover pressed on the tank opening of the tank car. There is an elastic displacement between the sealing cover and the tank opening of the tank car at the beginning, and the sealing cover is completely pressed on the tank opening of the tank car as the downward pre-tightening force is pressed, so that the sealing state is achieved and maintained.

[0007] Resetting devices and limiting devices are arranged in the expansion cavity between the upper flange and the lower connecting piece to drive the expansion body to retract and limit the expansion body. The resetting devices and the limiting devices cooperate to limit the maximum expansion stroke of the expansion cavity.

[0008] As a further scheme of the present application, the expansion body is an elastic bellows, and the elastic bellows is provided with an upper connecting ring and a lower connecting ring at the two ends of the pipe opening, respectively. The upper connecting ring is fixed to the upper connecting piece by bolts, and the lower connecting ring is fixed to the upper flange by bolts. The elastic bellows can ensure the expansion body to be elongated in the length direction and retracted, and the expansion body itself will not be damaged by stress and fatigue.

[0009] As a further scheme of the present application, the sealing cover comprises an annular framework, a plurality of screw holes are uniformly distributed around the annular framework, and screws are prearranged in the screw holes. Foamed rubber is cast along the annular framework to form a ring-shaped foamed rubber pad. The screw tail is embedded in the foamed rubber pad together with the annular framework, and the screw head protrudes out of the upper surface of the foamed rubber pad.

[0010] The other surface of the connecting surface between the foamed rubber pad and the lower flange is wrapped with a layer of polytetrafluoroethylene material, the lower flange is provided with bolt holes corresponding to the screws, the screws pass through the corresponding bolt holes and are fastened by nuts, and the pressing surface of the foamed rubber pad and the tank opening of the tank car is the sealing surface of the foamed rubber pad.

[0011] The foamed rubber is molded on the annular framework, which not only guarantees the specific shape of the sealing cover, but also realizes the softness of the sealing cover, and the outer part is wrapped with a layer of polytetrafluoroethylene, which prevents the reaction between the foamed rubber body and the organic solvent.

[0012] As a further scheme of the present application, the reset device comprises a plurality of positioning pins arranged in the telescopic cavity of the expansion body and uniformly distributed along the central axis of the expansion body, and a follow-up spring is arranged on each positioning pin;

[0013] Each positioning pin comprises a lower positioning cylinder and an upper positioning shaft, the upper positioning shaft is inserted into the lower positioning cylinder, the upper end of the upper positioning shaft is fixedly connected with the bottom surface of the upper connecting piece, and the lower end of the lower positioning cylinder is fixedly connected with the top surface of the upper flange. When the volume of the expansion body is retracted, the follow-up spring is retracted under the elastic force, and when the follow-up spring is retracted to a free state, the volume of the expansion body is unchanged, thereby forming an initial storage space.

[0014] As a further scheme of the present application, the limiting device comprises a limiting chain arranged between the upper connecting piece and the lower flange. When the expansion body continuously expands and the limiting chain is in a tight state, the telescopic cavity reaches the maximum limit of the telescopic stroke. When the limiting chain is pulled to the tightest state, the expansion body will not continue to expand, and the pre-tightening force transmitted to the sealing cover reaches the optimal pre-tightening state.

[0015] As a further scheme of the present application, the upper connecting piece is a ring cover, the ring cover body is provided with a liquid level probe mounting port, the liquid level probe mounting port is provided with a liquid level probe, and the liquid level probe is electrically connected with an anti-static oil overflow alarm.

[0016] As a further scheme of the present application, the ring cover body is further provided with a gas return port, the gas return port is provided with a gas return pipe, the gas outlet end of the gas return pipe is provided with a gas return flange, and the gas inlet end of the gas return pipe is in communication with the telescopic cavity of the expansion body. When the oil gas collected in the expansion body reaches the limit volume, the oil gas is output from the gas return pipe, thereby maintaining pressure balance.

[0017] As a further scheme of the present application, the diameter of the gas collecting hole is greater than the diameter of the tank opening of the tank car, and the diameter of the gas collecting pipe is between the diameter of the tank opening of the tank car and the diameter of the gas collecting hole. The tank opening of the tank car is wrapped in the gas collecting hole, and displacement deviation will not cause gas leakage.

[0018] The expansion body of the device is an elastic corrugated pipe, which can not only ensure the elongation of the expansion body in the length direction, but also can be retracted without causing stress and fatigue damage to the expansion body itself.

[0019] The expansion body is expanded in volume, and the displacement is transmitted to the sealing cover which is pressed on the tank opening of the tank car, and the sealing cover is initially elastically displaced from the tank opening, and is pressed by the downward pre-tightening force, so that the sealing cover is completely pressed on the tank opening, and reaches a sealed state with the tank opening.

[0020] The reset device and the limiting device cooperate to define the limit extension stroke of the expansion body telescopic cavity. The reset device and the limiting device cooperate to ensure that the telescopic cavity has an accommodation space at the beginning, and ensure that the telescopic cavity continues to expand at the maximum limit position.

[0021] The annular framework is molded by pouring foamed rubber, which ensures the specific shape of the sealing cover and realizes the softness of the sealing cover, and the outer part is wrapped with a layer of polytetrafluoroethylene, which prevents the foamed rubber body from reacting with the organic solvent, and has good sealing performance. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below.

[0023] Figure 1 is the overall schematic diagram of the present application Figure One ;

[0024] Figure 2 is the overall schematic diagram of the present application Figure Two ;

[0025] Figure 3 is the sealing cover schematic diagram of the present application.

[0026] In the figure: 1-sealing cover, 101-annular framework, 102-screw, 103-polytetrafluoroethylene material layer, 104-gas collecting hole, 2-upper connecting piece, 201-lower flange, 202-gas collecting pipe, 203-upper flange, 3-expansion body, 301-lower connecting ring, 302-upper connecting ring, 303-telescopic cavity, 4-lower connecting piece, 401-mounting hole, 5-liquid level probe mounting port, 6-gas return port, 601-gas return pipe, 602-gas return flange, 7-reset device, 701-following spring, 702-positioning pin, 8-limiting device, 801-limiting chain. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application.

[0028] In the present application, an organic solvent special balanced oil gas recovery device includes an upper connecting piece 2 and a lower connecting piece 2, and the upper connecting piece and the lower connecting piece are both aluminum products, which are light in weight and suitable for different tank car tank openings.

[0029] The upper connecting piece 2 is a ring cover, and a liquid level probe mounting port 5 is arranged on the ring cover body. A liquid level probe is arranged in the liquid level probe mounting port. When loading starts, the liquid level probe extends into the tank car to detect the liquid level of the organic solvent in real time. The liquid level probe is electrically connected with an anti-static oil overflow alarm. When the detected liquid level exceeds the set value, the anti-static oil overflow alarm starts to alarm, and then the loading is stopped.

[0030] An expansion body 3 made of polytetrafluoroethylene is arranged between the upper connecting piece and the lower connecting piece. The expansion body is an elastic bellows, and upper and lower connecting rings 302 and 301 are arranged at the two ends of the bellows, respectively. The upper and lower connecting rings are both made of aluminum. The upper connecting ring 302 is fixed to the upper connecting piece by bolts, and the lower connecting ring 301 is fixed to the upper flange 203 by bolts. When the expansion body is replaced, the bolts are unscrewed to remove the old expansion body. After the new expansion body is installed, the upper and lower connecting rings on the new expansion body are fixed to the upper connecting piece and the upper flange by bolts again.

[0031] The upper connecting piece, the lower connecting piece and the expansion body form an expansion cavity 303 for collecting and releasing gas. A vertical pipe is arranged along the central axis of the upper connecting piece and the lower connecting piece. An installation hole 401 and a gas collecting hole 104 are arranged in the upper connecting piece and the lower connecting piece in sequence. The installation hole 401 is in sealing fit with the vertical pipe, and the inner wall of the installation hole is in interference fit with the outer wall of the vertical pipe to achieve the effect of fixing position and sealing.

[0032] The lower connecting piece 2 includes an upper flange 203 and a lower flange 201. A gas collecting pipe 202 is arranged between the upper flange and the lower flange. A sealing cover 1 is arranged on the lower side of the lower flange. The gas collecting hole is arranged on the sealing cover. The diameter of the gas collecting hole is greater than the diameter of the tank opening of the tank car, and the diameter of the gas collecting pipe is between the diameter of the tank opening of the tank car and the diameter of the gas collecting hole. The gas collecting hole completely wraps the tank opening of the tank car. During the alignment of the gas collecting hole and the tank opening of the tank car, the slight displacement will not affect the sealing performance between the gas collecting hole and the tank opening. The upward organic oil gas in the tank opening flows upward along the gas collecting hole and into the gas collecting pipe.

[0033] The sealing cover 1 includes an annular framework 101. A plurality of screw holes are uniformly distributed around the annular framework. Screws 102 are prearranged in the screw holes. Foamed rubber is poured and formed along the annular framework to form an annular foamed rubber pad. The tail part of the screw is embedded in the foamed rubber pad together with the annular framework, and the head part of the screw protrudes above the surface of the foamed rubber pad. The lower flange is provided with bolt holes corresponding to the screws. The screws pass through the corresponding bolt holes and are fastened by nuts. The lower flange and the sealing cover are fixed by screw-nut cooperation.

[0034] The other surface of the connecting surface between the foamed rubber pad and the lower flange is wrapped with a layer of polytetrafluoroethylene material 103, the sealing cover is pressed on the tank opening of the tank truck, the pressing surface between the foamed rubber pad and the tank opening of the tank truck is the sealing surface of the foamed rubber pad. The organic oil gas is covered with a layer of polytetrafluoroethylene material 103 on the surface of the foamed rubber pad, and the polytetrafluoroethylene material layer is 0.8 mm. The foamed rubber pad maintains its softness and does not react with the organic oil gas, and maintains the sealing performance.

[0035] The oil gas discharged from the tank opening of the tank truck is collected into the expansion body through the gas collecting hole 104 and the gas collecting pipe 202 in turn. As the oil gas accumulates, the pressure of the oil gas in the expansion body increases, the volume of the expansion body expands to generate a counteracting force to increase the pressing force of the sealing cover on the tank opening of the tank truck, and the sealing performance between the sealing cover 1 and the tank opening of the tank truck is continuously enhanced as the pressing force increases. When the pressing force between the sealing cover and the tank opening of the tank truck reaches the maximum balance state, the sealing performance between the sealing cover and the tank opening of the tank truck reaches the pressing sealing state; the volume of the expansion body expands, and the displacement is transmitted to the sealing cover pressed on the tank opening of the tank truck. There is an elastic displacement between the sealing cover and the tank opening of the tank truck at the beginning, and the sealing cover is pressed on the tank opening of the tank truck under the pre-tightening force, and the sealing cover reaches and maintains the sealing state with the tank opening of the tank truck.

[0036] The reset device 7 and the limiting device 8 for driving the expansion body to retract and limit are arranged in the telescopic cavity between the upper flange and the lower connecting piece, and the reset device and the limiting device cooperate to limit the limit extension stroke of the expansion body telescopic cavity.

[0037] The reset device 7 includes a plurality of positioning pins 702 arranged in the telescopic cavity of the expansion body and uniformly distributed along the central axis of the expansion body, and a follow-up spring 701 is arranged on each positioning pin;

[0038] Each positioning pin includes a lower positioning cylinder and an upper positioning shaft, the upper end of the upper positioning shaft is fixedly connected with the bottom surface of the upper connecting piece, the lower end of the lower positioning cylinder is fixedly connected with the top surface of the upper flange, and the upper positioning shaft is inserted into the lower positioning cylinder. The maximum displacement of the upper positioning shaft moving upward will not be out of the uppermost port position of the lower positioning cylinder. When the organic oil gas pressure in the expansion body continuously increases, the upper positioning shaft and the lower positioning cylinder move relatively apart.

[0039] When the expansion body expands in the axial direction, the limiting device 8 includes a limiting chain 801 arranged between the upper connecting piece and the lower flange. When the limiting chain 801 is in a tight state, the telescopic cavity reaches the maximum limit extension stroke. When the limiting chain is pulled to the tightest, the expansion body will not continue to expand, and the pre-tightening force transmitted to the sealing cover reaches the optimal pre-tightening state.

[0040] The ring cover body is further provided with a back gas port 6, a back gas pipe 601 is arranged at the back gas port, a back gas flange 602 is arranged at the outlet of the back gas pipe, and the inlet of the back gas pipe is communicated with the telescopic cavity of the expansion body. When the oil gas collected in the expansion body reaches the limit volume, the oil gas is output from the back gas pipe to keep the pressure balance. When the organic oil gas in the expansion body is released, the pressure is continuously reduced, the upper positioning shaft and the lower positioning cylinder move towards each other until the follow-up spring 701 reaches the free state, and the relative displacement is stopped. Finally, the purpose of recycling the organic oil gas is achieved.

[0041] The working principle and use process of the present application are as follows:

[0042] First, according to the height of the tank mouth of the tank car, in the free state of the expansion body, the installation hole and the installation position of the vertical pipe are measured, the installation hole 401 is in interference fit with the vertical pipe and is sealed and fixed on the vertical pipe. The vertical pipe penetrates through the gas collecting hole on the expansion body and the sealing cover and extends into the tank car from the tank pipe. The sealing cover just falls on the tank pipe of the tank car and is supported by the tank pipe to form an initial sealing force. The diameter of the gas collecting hole is larger than the diameter of the tank mouth of the tank car, and the gas collecting hole completely wraps the tank mouth of the tank car. During the alignment of the gas collecting hole and the tank mouth of the tank car, the slight displacement will not affect the sealing performance between the gas collecting hole and the tank mouth of the tank car. At the same time, the liquid level probe extends into the tank car through the gas collecting hole and the tank pipe to detect the liquid level of the organic solvent in real time. The liquid level probe is electrically connected with an anti-static oil overflow alarm.

[0043] When the loading starts, the organic oil gas discharged upward from the tank mouth of the tank car is collected into the expansion body through the gas collecting hole 104 and the gas collecting pipe 202 in sequence. With the continuous accumulation of oil gas, the oil gas pressure in the expansion body increases, the expansion body volume expands to generate a counteracting force to increase the compression force of the sealing cover to the tank mouth of the tank car. Through the expansion of the expansion body volume, the displacement is transmitted to the sealing cover compressed on the tank mouth of the tank car. At the beginning, there is an elastic displacement between the sealing cover and the tank mouth of the tank car. With the downward pre-tightening force, the sealing cover is completely compressed on the tank mouth of the tank car to achieve and maintain the sealing state with the tank mouth of the tank car. When the limiting chain 801 in the expansion body is in the tight state, the telescopic cavity reaches the maximum limit of the telescopic stroke. When the limiting chain is pulled to the tightest, the expansion body will not continue to expand, and the pre-tightening force transmitted to the sealing cover reaches the optimal pre-tightening state.

[0044] When the oil gas collected in the expansion body reaches the limit volume, the oil gas is output from the back gas pipe to keep the pressure balance. When the organic oil gas in the expansion body is released,

[0045] the pressure is continuously reduced, the upper positioning shaft and the lower positioning cylinder move towards each other until the follow-up spring 701 reaches the free state, and the relative displacement is stopped. Finally, the purpose of recycling the organic oil gas is achieved.

[0046] When the liquid level detected by the liquid level probe exceeds the set value, the anti-static oil overflow alarm starts to alarm, and the loading is stopped.

[0047] When loading, the liquid level probe extends into the tank truck, and the organic oil gas in the tank truck is collected into the expansion body through the gas collecting hole 104 and the gas collecting pipe 202. When the limit chain 801 in the expansion body is in a tight state, the telescopic cavity reaches the maximum limit telescopic stroke, the excess organic oil gas is output from the return gas pipe, and the pressure balance is maintained. When the organic oil gas in the expansion body is released, the pressure is continuously reduced, the upper positioning shaft and the lower positioning cylinder move towards each other, and when the follow-up spring 701 reaches the free state, the relative displacement is stopped. Finally, the purpose of recovering the organic oil gas is achieved.

[0048] After loading is completed, the organic oil gas in the telescopic cavity is output from the return gas pipe, the pressure is continuously reduced, the upper positioning shaft and the lower positioning cylinder move towards each other, and when the follow-up spring 701 reaches the free state, the relative displacement is stopped. The pre-tightening force between the sealing cover and the tank opening gradually decreases to the initial position, and finally the crane pipe and the device as a whole are moved away from the tank pipe opening, and are ready for the next loading operation.

[0049] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0050] Although embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A dedicated balanced oil and gas recovery device for organic solvents, characterized in that, The system includes an upper connector (2) and a lower connector (4). An expansion body (3) made of polytetrafluoroethylene is provided between the upper and lower connectors. The upper and lower connectors and the expansion body form a telescopic cavity (303) for collecting and releasing gas. The upper and lower connectors have mounting holes (401) and gas collection holes (104) through which a vertical pipe passes sequentially along their central axis. The mounting holes are sealed to the vertical pipe. The lower connector includes an upper flange (203) and a lower flange (201). A gas collection pipe (202) is provided between the upper and lower flanges. The lower flange... A sealing cover (1) is provided on the side, and a gas collection hole is opened on the sealing cover. The sealing cover is pressed and closed on the tank car opening. The oil and gas discharged from the tank car opening are collected into the expansion body through the gas collection hole and the gas collection pipe. As the oil and gas accumulate, the oil and gas pressure in the expansion body increases accordingly. The expansion body expands and generates a reaction force to drive the sealing cover to increase the pressing force on the tank car opening. The sealing performance between the sealing cover and the tank car opening is continuously enhanced as the pressing force increases. When the pressing force between the sealing cover and the tank car opening reaches the maximum equilibrium state, the sealing performance between the sealing cover and the tank car opening reaches the pressing and sealing state. The telescopic cavity between the upper flange and the lower connector is provided with a reset device (7) and a limiting device (8) for driving the expansion body to retract and limit its movement. The reset device and the limiting device work together to limit the maximum telescopic stroke of the expansion body's telescopic cavity. The expansion body (3) is an elastic bellows, and an upper connecting ring (302) and a lower connecting ring (301) are respectively provided at both ends of the elastic bellows. The upper connecting ring is fixed to the upper connecting piece by bolts, and the lower connecting ring is fixed to the upper flange by bolts. The sealing cap (1) includes an annular skeleton (101), with a number of screw holes evenly distributed around the annular skeleton. Screws (102) are pre-installed in the screw holes. Foamed rubber is cast along the annular skeleton to form an annular foamed rubber pad. The tail of the screw is embedded in the foamed rubber pad as an integral part of the annular skeleton, and the head of the screw extends out of the upper surface of the foamed rubber pad. The surfaces of the foamed rubber gasket other than the connection surface with the lower flange are covered with a layer of polytetrafluoroethylene material (103). The lower flange is provided with bolt holes that correspond to the screws. The screws pass through the corresponding bolt holes and are all tightened by nuts. The pressing surface of the foamed rubber gasket and the tank opening of the tank truck is the sealing surface of the foamed rubber gasket.

2. The organic solvent-specific balanced oil and gas recovery device according to claim 1, characterized in that, The reset device (7) includes a number of positioning pins (702) arranged in the telescopic cavity of the expansion body and evenly distributed around the central axis of the expansion body. Each positioning pin is provided with a follow-up spring (701). The upper end of the follow-up spring is connected to the upper connecting piece, and the lower end of the follow-up spring is connected to the upper flange. Each locating pin includes a lower locating cylinder and an upper locating shaft. The upper locating bearing is inserted into the lower locating cylinder. The upper end of the upper locating shaft is fixedly connected to the bottom surface of the upper connector, and the lower end of the lower locating cylinder is fixedly connected to the top surface of the upper flange.

3. The organic solvent-specific balanced oil and gas recovery device according to claim 1, characterized in that, The limiting device (8) includes a limiting chain (801), which is set between the upper connector and the upper flange. When the expansion body expands continuously and the limiting chain is in a taut state, the telescopic cavity reaches its maximum limit telescopic stroke.

4. The organic solvent-specific balanced oil and gas recovery device according to claim 1, characterized in that, The upper connector (2) is a ring cover. The ring cover body is provided with a liquid level probe installation port (5). A liquid level probe is provided in the liquid level probe installation port. The liquid level probe is electrically connected to an anti-static oil overflow alarm.

5. The organic solvent-specific balanced oil and gas recovery device according to claim 4, characterized in that, The ring cover body is also provided with a return air port (6), a return air pipe (601) is provided at the return air port, a return air flange (602) is provided at the air outlet end of the return air pipe, and the air inlet end of the return air pipe is connected to the expansion cavity of the expansion body.

6. The organic solvent-specific balanced oil and gas recovery device according to claim 1, characterized in that, The diameter of the gas collecting hole (104) is larger than the diameter of the tank truck opening, and the diameter of the gas collecting pipe (202) is between the diameter of the tank truck opening and the diameter of the gas collecting hole.

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