A filling limit device for cryogenic liquid storage tank

Abstract

The present invention relates to a filling limit device for a cryogenic liquid storage tank, wherein the lower outer side of the upper limiter fits the inner wall of the lower limiter and moves up and down along the lower limiter, the upper limiter is sealed at the bottom, the lower opening is connected to the liquid inlet pipe, an inner liquid outlet is arranged on the side, the lower limiter has upper and lower openings, and an outer liquid outlet is arranged on the side, and the inner liquid outlet and the outer liquid outlet are arranged in corresponding positions; in the normal liquid filling state, the inner liquid outlet of the upper limiter corresponds to the outer liquid outlet of the lower limiter, and the outer liquid outlet includes the inner liquid outlet, and the cryogenic liquid enters the storage tank through the bottom of the lower limiter, the inner liquid outlet, and the outer liquid outlet; in the non-liquid filling state, the inner liquid outlet of the upper limiter and the outer liquid outlet of the lower limiter are misaligned, and the cryogenic liquid cannot enter the storage tank. When the liquid level reaches a certain position, the present invention automatically reduces the inflow of liquid, finally closes the liquid inlet, increases the liquid inflow pressure resistance when the liquid flows into a certain position, facilitates the liquid filling device to detect the change of pressure resistance and then act, double protection, and effectively prevents excessive filling.

Description

Technical Field

[0001] The present invention relates to the technical field of cryogenic liquid equipment, and in particular to a cryogenic liquid storage tank filling limit device which automatically reduces liquid inflow and eventually closes a liquid inlet when the liquid level reaches a certain position, increases liquid inflow piezoresistance when the liquid flows into a certain position, facilitates a liquid filling device to detect changes in piezoresistance and then actuate, provides double protection, and effectively prevents excessive filling of liquid. Background Art

[0002] Usually when filling a storage tank with cryogenic liquid, a maximum filling volume must be determined to ensure that a certain amount of safety space must be left in the tank to accommodate the gas generated by the liquid in the tank due to heat absorption and vaporization during actual use of the tank, thereby extending the time for the gas pressure to reach the preset discharge pressure of the safety valve and release the gas to the outside. We usually call this time from the vaporization of the cryogenic liquid to the release of the gas to the outside the "maintenance time". If the storage tank is 100% filled with cryogenic liquid, there is no safety space in the storage tank to accommodate the vaporized liquid, and the "maintenance time" of the storage tank will be greatly shortened. The cryogenic liquid storage tank cannot be filled to the brim, and a certain amount of space must be left to allow space for the cryogenic liquid to vaporize in the storage tank.

[0003] There are currently three existing technologies for determining the maximum filling volume: the first is the weighing method. That is, a scale is used to determine whether the specified maximum filling volume has been reached, and filling is stopped when it has been reached. However, the implementation method of this technology is very cumbersome and is limited by the equipment itself and environmental conditions. The second is the overflow method. That is, an overflow pipe is set at the maximum filling level specified in the storage tank. When the liquid reaches the specified level, the cryogenic liquid will flow out of the overflow pipe and the filling will be stopped immediately. However, this method is not suitable for cryogenic liquids that are prohibited from overflowing directly into the nature, such as liquid hydrogen and liquefied natural gas. The third is the instrument detection method. That is, a liquid level sensitive element or liquid level gauge is used to detect whether the cryogenic liquid in the storage tank has reached the specified level, and filling is stopped when it is reached. However, due to the large number of bubbles in the cryogenic liquid during filling, there is a large error between the liquid level sensed by the instrument and the actual liquid level in the tank, which is not advisable.

[0004] A deep-cold liquid storage tank filling limit device is needed, which can automatically reduce the liquid inflow and finally close the liquid inlet when the liquid level reaches a certain position, increase the liquid inflow pressure resistance when the liquid flows into a certain position, facilitate the filling device to detect the pressure resistance change and then act, provide double protection, and effectively prevent excessive filling of liquid. Summary of the invention

[0005] The purpose of the present invention is to provide a deep-cold liquid storage tank filling limit device which automatically reduces the inflow of liquid and eventually closes the liquid inlet when the liquid level reaches a certain position, increases the liquid inflow piezoresistance when the liquid flows into a certain position, facilitates the liquid filling device to detect the change in piezoresistance and then act, provides double protection, and effectively prevents excessive filling of liquid.

[0006] A cryogenic liquid storage tank filling limit device, comprising:

[0007] An upper limit member, wherein the lower outer side of the upper limit member fits the inner wall of the lower limit member and moves up and down along the lower limit member, the upper limit member is sealed at the bottom, the lower opening is connected to the liquid inlet pipe, and an inner liquid outlet is arranged on the side, the lower and upper openings of the lower limit member, and an outer liquid outlet is arranged on the side, the inner liquid outlet and the outer liquid outlet are located in corresponding positions, and the outer liquid outlet is larger than the inner liquid outlet, and a limit plate is fixedly arranged above the upper limit member;

[0008] In the normal liquid filling state, the inner liquid outlet of the upper limit member corresponds to the outer liquid outlet of the lower limit member, and the outer liquid outlet includes the inner liquid outlet, and the cryogenic liquid enters the storage tank through the bottom of the lower limit member, the inner liquid outlet, and the outer liquid outlet;

[0009] In the half-filled state, the inner liquid outlet of the upper limit member corresponds to the outer liquid outlet of the lower limit member, the outer liquid outlet and the inner liquid outlet partially overlap, and the cryogenic liquid enters the storage tank through the bottom of the lower limit member, the inner liquid outlet and the outer liquid outlet;

[0010] When the liquid is not filled, the inner liquid outlet of the upper limit member and the outer liquid outlet of the lower limit member are misaligned, and the cryogenic liquid cannot enter the storage tank.

[0011] The upper limit member is in the shape of an inverted barrel, and the lower limit member is in the shape of a circular ring.

[0012] A shoulder is arranged on the upper portion of the upper limit member, and the width of the shoulder is greater than the width of the lower limit member (2).

[0013] An inward boss is arranged at the bottom of the lower limit member, and the boss supports the upper limit member.

[0014] The inner liquid outlet and the outer liquid outlet are circular holes.

[0015] The inner liquid outlets are evenly distributed around the upper limit member, and the centers are located in the same plane. The outer liquid outlets are evenly distributed around the lower limit member, and the centers are located in the same plane.

[0016] The bottom of the lower limit member is connected to a liquid inlet pipe, one end of which is located outside the storage tank and is provided with a liquid inlet valve, an air outlet pipe is provided at the upper portion of the storage tank, one end of which is located outside the storage tank and is provided with an air outlet valve, a liquid outlet pipe is provided at the lower portion of the storage tank, one end of which is located outside the storage tank and is provided with a liquid outlet valve.

[0017] A buffer groove is arranged between the bottom of the lower limit member and the liquid inlet pipe.

[0018] The limiting plate is fixedly arranged on the inner upper part of the storage tank.

[0019] A guide groove is arranged at the contact point between the upper limit member and the lower limit member.

[0020] The outer side of the lower part of the upper limit member of the present invention fits the inner wall of the lower limit member and moves up and down along the lower limit member, the upper limit member is sealed at the bottom, the lower opening is connected to the liquid inlet pipe, an inner liquid outlet is arranged on the side, the upper and lower openings of the lower limit member, an outer liquid outlet is arranged on the side, the inner liquid outlet and the outer liquid outlet are in corresponding positions, and the outer liquid outlet is larger than the inner liquid outlet, and a limit plate is fixedly arranged on the upper part of the upper limit member; in the normal liquid filling state, the inner liquid outlet of the upper limit member corresponds to the outer liquid outlet of the lower limit member, the outer liquid outlet includes the inner liquid outlet, and the deep cold liquid enters the storage tank through the bottom of the lower limit member, the inner liquid outlet, and the outer liquid outlet; in the semi-liquid filling state, the inner liquid outlet of the upper limit member corresponds to the outer liquid outlet of the lower limit member, the outer liquid outlet and the inner liquid outlet partially overlap, and the deep cold liquid enters the storage tank through the bottom of the lower limit member, the inner liquid outlet, and the outer liquid outlet; in the non-liquid filling state, the inner liquid outlet of the upper limit member and the outer liquid outlet of the lower limit member are misaligned, and the deep cold liquid cannot enter the storage tank. When the liquid level reaches a certain position, the present invention automatically reduces the inflow of liquid and finally closes the liquid inlet. When the liquid flows into a certain position, the liquid inflow piezoresistance is increased, so that the liquid filling device can detect the change of piezoresistance and then take action. The double protection effectively prevents excessive filling. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the normal liquid filling state of the present invention;

[0022] Figure 2 It is a schematic diagram of the half-liquid-filled state of the present invention;

[0023] Figure 3 It is a schematic diagram of the present invention in a non-liquid-filled state;

[0024] Figure 4 It is a schematic diagram of the normal liquid filling state with a boss of the present invention;

[0025] Figure 5 It is a structural schematic diagram of the present invention;

[0026] In the figure: 1. upper limit member, 2. lower limit member, 3. internal liquid outlet, 4. external liquid outlet, 5. shoulder, 6. boss, 7. limit plate, 8. buffer tank, 9. liquid inlet pipe, 10. liquid inlet valve, 11. air outlet valve, 12. air outlet pipe, 13. liquid outlet valve, 14. liquid outlet pipe, 15. storage tank. DETAILED DESCRIPTION

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] A filling limit device for a cryogenic liquid storage tank comprises: an upper limit member 1, the lower outer side of the upper limit member 1 is attached to the inner wall of the lower limit member 2, and moves up and down along the lower limit member 2, the upper limit member 1 is sealed at the bottom, the lower opening is connected to the liquid inlet pipe 9, an inner liquid outlet 3 is arranged on the side, the lower and upper openings of the lower limit member 2, an outer liquid outlet 4 is arranged on the side, the inner liquid outlet 3 and the outer liquid outlet 4 are located in corresponding positions, and the outer liquid outlet 4 is larger than the inner liquid outlet 3, and a limiting plate 7 is fixedly arranged above the upper limit member 1; in the normal filling state, the inner liquid outlet 3 of the upper limit member 1 and the lower limit member 2 are in the same position. The outgoing liquid outlet 4 corresponds to the outgoing liquid outlet 4, which includes the inner liquid outlet 3. The cryogenic liquid enters the storage tank 15 through the bottom of the lower limit member 2, the inner liquid outlet 3 and the outgoing liquid outlet 4; when in the half-filled state, the inner liquid outlet 3 of the upper limit member 1 corresponds to the outgoing liquid outlet 4 of the lower limit member 2, and the outgoing liquid outlet 4 and the inner liquid outlet 3 partially overlap, and the cryogenic liquid enters the storage tank 15 through the bottom of the lower limit member 2, the inner liquid outlet 3 and the outgoing liquid outlet 4; when not filled, the inner liquid outlet 3 of the upper limit member 1 and the outgoing liquid outlet 4 of the lower limit member 2 are misaligned, and the cryogenic liquid cannot enter the storage tank 15.

[0029] The upper limit member 1 is in the shape of an inverted barrel, and the lower limit member 2 is a circular ring. A shoulder 5 is provided on the upper part of the upper limit member 1, and the width of the shoulder 5 is greater than the width of the lower limit member 2. An inward boss 6 is provided at the bottom of the lower limit member 2, and the boss 6 supports the upper limit member 1. The inner liquid outlet 3 and the outer liquid outlet 4 are circular holes. The inner liquid outlet 3 is evenly distributed around the upper limit member 1, and the center is located in the same plane, and the outer liquid outlet 4 is evenly distributed around the lower limit member 2, and the center is located in the same plane. The bottom of the lower limit member 2 is connected to the liquid inlet pipe 9, one end of the liquid inlet pipe 9 is located outside the storage tank 15, and a liquid inlet valve 10 is provided, an air outlet pipe 12 is provided at the upper part of the storage tank 15, one end of the air outlet pipe 12 is located outside the storage tank 15, and an air outlet valve 11 is provided, and a liquid outlet pipe 14 is provided at the lower part of the storage tank 15, one end of the liquid outlet pipe 14 is located outside the storage tank 15, and a liquid outlet valve 13 is provided. A buffer groove 8 is provided between the bottom of the lower stopper 2 and the liquid inlet pipe 9. The stopper plate 7 is fixedly provided on the inner upper part of the storage tank 15. A guide groove is provided at the contact point between the upper stopper 1 and the lower stopper 2.

[0030] When it is necessary to fill the storage tank 15 with liquid, aim the filling gun at the liquid inlet valve 10 at the end of the liquid inlet pipe 9, and send the cryogenic liquid into the liquid inlet valve 10, the liquid inlet pipe 9, and the buffer tank 8, and then enter the lower limit member 2. In the normal filling state, the liquid level of the cryogenic liquid inside the storage tank 15 is lower than the external liquid port 4, and the internal liquid outlet 3 of the upper limit member 1 corresponds to the external liquid port 4 of the lower limit member 2. The external liquid port 4 includes the internal liquid outlet 3, and the cryogenic liquid passes through the bottom of the lower limit member 2, the internal liquid outlet 3, and the external liquid port 4 into the storage tank 15.

[0031] When the level of the cryogenic liquid inside the storage tank 15 gradually submerges the outgoing liquid port 4, there is air on the upper part of the upper limit member 1, which will move upward along the lower limit member 2 under the action of buoyancy, thereby reducing the overlapping portion of the outgoing liquid port 4 and the inner liquid port 3, hindering the cryogenic liquid from entering the storage tank 15. The entry pressure of the cryogenic liquid increases, and at the same time, a pressure detection device is provided on the filling gun, which can detect the pressure increase and remind the operator that the level of the cryogenic liquid has been released to the lower limit member 2. At this time, the filling gun can be further filled or the operation can be stopped as needed, and the filling gun is in a semi-filled state.

[0032] When the liquid adding gun further adds liquid, when the inner liquid outlet 3 of the upper limit member 1 and the outer liquid outlet 4 of the lower limit member 2 are misaligned, the cryogenic liquid cannot enter the storage tank 15, and the pressure detection device on the liquid adding gun will detect the pressure increase, cut off the liquid adding process, and complete the liquid adding.

[0033] The upper limit member 1 is in the shape of an inverted barrel, and the lower limit member 2 is a circular ring, which is convenient for connection and cooperation, and limits the cryogenic liquid from flowing into the storage tank 15 from the contact point between the upper limit member 1 and the lower limit member 2. A shoulder 5 is provided on the upper part of the upper limit member 1, and the width of the shoulder 5 is greater than the width of the lower limit member 2. When the upper limit member 1 moves downward, a limit is provided, which facilitates the external liquid outlet 4 and the internal liquid outlet 3 to conduct liquid out. An inward boss 6 is provided at the bottom of the lower limit member 2, and the boss 6 supports the upper limit member 1. When the upper limit member 1 moves downward, a limit is provided, which facilitates the external liquid outlet 4 and the internal liquid outlet 3 to conduct liquid out.

[0034] The inner liquid outlet 3 and the outer liquid outlet 4 are circular holes, which increase the conductive cotton knots when overlapping and facilitate processing. The inner liquid outlet 3 is evenly distributed around the upper limit member 1, and the center is located in the same plane. The outer liquid outlet 4 is evenly distributed around the lower limit member 2, and the center is located in the same plane. A plurality of inner liquid outlets 3 and outer liquid outlets 4 are set for use in combination to facilitate the conduction of liquid.

[0035] The bottom of the lower limit member 2 is connected to the liquid inlet pipe 9, one end of which is located outside the storage tank 15, and a liquid inlet valve 10 is provided. An air outlet pipe 12 is provided at the upper part of the storage tank 15, one end of which is located outside the storage tank 15, and an air outlet valve 11 is provided. A liquid outlet pipe 14 is provided at the lower part of the storage tank 15, one end of which is located outside the storage tank 15, and a liquid outlet valve 13 is provided. In actual use, liquid is filled and discharged, and the gas required for use is released. A buffer groove 8 is provided between the bottom of the lower limit member 2 and the liquid inlet pipe 9 to prevent the liquid entering the liquid adding gun from impacting the upper limit member 1, causing the upper limit member 1 to frequently operate or cause misoperation. The limit plate 7 is fixedly provided on the inner upper part of the storage tank 15 to limit the upper limit member 1 when it moves upward to the top. A guide groove is provided at the contact point between the upper limit member 1 and the lower limit member 2 to ensure that the upper limit member 1 moves linearly up and down.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A filling limit device for a cryogenic liquid storage tank, characterized in that: include: An upper limit member (1), wherein the lower outer side of the upper limit member (1) is in contact with the inner wall of the lower limit member (2) and moves up and down along the lower limit member (2); the upper limit member (1) is sealed at the bottom, the lower opening is connected to the liquid inlet pipe (9), and an inner liquid outlet (3) is arranged on the side; the lower limit member (2) has upper and lower openings, and an outer liquid outlet (4) is arranged on the side; the inner liquid outlet (3) and the outer liquid outlet (4) are located in correspondence with each other, and the outer liquid outlet (4) is larger than the inner liquid outlet (3); a limit plate (7) is fixedly arranged above the upper limit member (1); In a normal liquid filling state, the inner liquid outlet (3) of the upper limit member (1) corresponds to the outer liquid outlet (4) of the lower limit member (2), and the outer liquid outlet (4) includes the inner liquid outlet (3), and the cryogenic liquid enters the storage tank (15) through the bottom of the lower limit member (2), the inner liquid outlet (3), and the outer liquid outlet (4); In the half-filled state, the inner liquid outlet (3) of the upper limit member (1) corresponds to the outer liquid outlet (4) of the lower limit member (2), the outer liquid outlet (4) and the inner liquid outlet (3) partially overlap, and the cryogenic liquid enters the storage tank (15) through the bottom of the lower limit member (2), the inner liquid outlet (3), and the outer liquid outlet (4); When the liquid is not filled, the inner liquid outlet (3) of the upper limit member (1) and the outer liquid outlet (4) of the lower limit member (2) are misaligned, and the cryogenic liquid cannot enter the storage tank (15); The upper limit member (1) is in the shape of an inverted cylinder, and the lower limit member (2) is a circular ring; A shoulder (5) is provided on the upper portion of the upper limit member (1), and the width of the shoulder (5) is greater than the width of the lower limit member (2); An inward boss (6) is provided at the bottom of the lower limit member (2), and the boss (6) supports the upper limit member (1); The inner liquid outlet (3) and the outer liquid outlet (4) are circular holes; The inner liquid outlets (3) are evenly distributed around the upper limit member (1), and their centers are located in the same plane; the outer liquid outlets (4) are evenly distributed around the lower limit member (2), and their centers are located in the same plane; The bottom of the lower limit member (2) is connected to a liquid inlet pipe (9), one end of the liquid inlet pipe (9) is located outside the storage tank (15) and is provided with a liquid inlet valve (10), an air outlet pipe (12) is provided at the upper part of the storage tank (15), one end of the air outlet pipe (12) is located outside the storage tank (15) and is provided with an air outlet valve (11), and a liquid outlet pipe (14) is provided at the lower part of the storage tank (15), one end of the liquid outlet pipe (14) is located outside the storage tank (15) and is provided with a liquid outlet valve (13); A buffer groove (8) is provided between the bottom of the lower limit member (2) and the liquid inlet pipe (9); The limit plate (7) is fixedly arranged on the inner upper part of the storage tank (15); A guide groove is provided at the contact point between the upper limit member (1) and the lower limit member (2).

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