CN219222066U - Overcharge preventing device suitable for vertical low-temperature storage tank - Google Patents
Overcharge preventing device suitable for vertical low-temperature storage tank Download PDFInfo
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- CN219222066U CN219222066U CN202223016976.7U CN202223016976U CN219222066U CN 219222066 U CN219222066 U CN 219222066U CN 202223016976 U CN202223016976 U CN 202223016976U CN 219222066 U CN219222066 U CN 219222066U
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- 238000003860 storage Methods 0.000 title claims abstract description 39
- 239000007788 liquid Substances 0.000 claims abstract description 282
- 230000006835 compression Effects 0.000 claims abstract description 16
- 238000007906 compression Methods 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 230000002265 prevention Effects 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 8
- 230000000903 blocking effect Effects 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 5
- 230000000630 rising effect Effects 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 238000005429 filling process Methods 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 239000003949 liquefied natural gas Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
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Abstract
The utility model discloses an anti-overcharging device suitable for a vertical low-temperature storage tank, wherein the bottom of an inner liquid inlet pipe is provided with a lower baffle plate for sealing an outlet at the bottom end of the inner liquid inlet pipe, a plurality of liquid outlet holes are circumferentially arranged on the side wall of the inner liquid inlet pipe at intervals, a limit-charging baffle pipe is sleeved on the inner liquid inlet pipe, the bottom of the limit-charging baffle pipe is connected with the lower baffle plate at the periphery of the bottom end of the inner liquid inlet pipe through a compression spring sleeved on the inner liquid inlet pipe, a floating ball below the lower baffle plate is hung on the limit-charging baffle pipe through a connecting piece, a lifting gap which is convenient for the limit-charging baffle pipe to lift up and down along the inner liquid inlet pipe is arranged between the limit-charging baffle pipe and the inner liquid inlet pipe, and a limiting mechanism is arranged on the inner liquid inlet pipe above the liquid outlet holes; when the liquid level of the low-temperature liquid reaches the limit filling position, the flow and the flow speed of the low-temperature liquid entering the inner cylinder can be greatly reduced, so that the liquid level rising speed of the low-temperature liquid is greatly slowed down, the subsequent treatment time for closing the liquid inlet stop valve on the outer liquid inlet pipe is longer, and the anti-overcharging device is more reliable than the anti-overcharging performance of a common overflow mechanism.
Description
Technical Field
The utility model relates to a vertical storage tank for storing cryogenic liquids such as liquefied natural gas and liquid hydrogen, in particular to an overcharge prevention device used in the vertical storage tank.
Background
When storing cryogenic liquids such as lng and liquid hydrogen, vertical cryogenic tanks such as vertical cryogenic gas cylinders are sometimes used. The vertical low-temperature storage tank is generally of a double-layer structure of an outer cylinder and an inner cylinder, a vacuum interlayer is formed between the inner cylinder and the outer cylinder, a distribution head is arranged in a central through hole of an outer upper sealing head of the outer cylinder, a vertical support neck pipe is arranged in a central through hole of an inner upper sealing head of the inner cylinder, the top end of the support neck pipe extends into the vacuum interlayer and is sealed and fixed with the bottom of the distribution head, and the inner cylinder and the outer cylinder are connected with each other through the support neck pipe. A plurality of connecting channels are arranged in the distributing head. The piping in the vertical cryogenic tank comprises: a liquid inlet pipe, a blow-down pipe, a liquid outlet pipe, etc. For convenience of description, the liquid inlet pipe in the vertical low-temperature storage tank is called an inner liquid inlet pipe, the liquid inlet pipe outside the vertical low-temperature storage tank is called an outer liquid inlet pipe, the outer liquid inlet pipe and the inner liquid inlet pipe are in butt joint through corresponding connecting channels in the distribution head, the vertically arranged inner liquid inlet pipe vertically penetrates through the inner cavity of the vertically arranged support neck pipe, and the bottom end of the vertically arranged inner liquid inlet pipe extends into the inner cylinder inner cavity of the vertical low-temperature storage tank.
According to the requirements of the standard GB/T18442.3-2019 and TSG 21-2021, the current small cryogenic container with the geometric volume not more than 10m and the anti-overcharging device should be configured so that the effective volume is not more than 95%. The top of the inner cylinder of the vertical low-temperature storage tank with the geometric volume not more than 10m is provided with a safe gas phase space which is more than or equal to 5 percent, so that the pressure in the inner cylinder can not be rapidly increased after the low-temperature liquid in the vertical low-temperature storage tank is gasified by heating, and potential safety hazards are avoided. The current common overcharge prevention device is an overflow mechanism. The overflow mechanism includes: the overflow pipe is arranged on the vertical low-temperature storage tank, the overflow port of the overflow pipe extending into the inner cylinder is positioned at a set height in the inner cylinder, and the overflow valve is arranged on the overflow pipe. For ease of description, the level at which the vertical cryogenic tank is filled to the top leaving only 5% of the safe gas phase space is referred to as the limiting level. Before the vertical low-temperature storage tank is filled with low-temperature liquid, the overflow valve is opened first, then the low-temperature liquid is filled, when the liquid level of the low-temperature liquid in the vertical low-temperature storage tank reaches the height of the overflow port, the low-temperature liquid flows out of the overflow pipe, at the moment, the overflow valve is closed manually, and then the liquid inlet stop valve on the outer liquid inlet pipe is closed, so that the filling process is completed. The overcharge preventing device of the above structure has the following disadvantages: when the anti-overcharging device is operated, an operator is required to observe that low-temperature liquid enters the overflow pipe and then the step of closing the liquid inlet stop valve on the outer liquid inlet pipe is carried out, but after the low-temperature liquid is filled into the overflow pipe, the low-temperature liquid still keeps the flow and the flow speed during normal filling, because the pipe diameter of the overflow pipe is smaller, the liquid level in the overflow pipe can rapidly rise, if the operator is not on site, the liquid level in the inner cylinder can continuously and rapidly rise after the low-temperature liquid fills the overflow pipe until the low-temperature liquid in the inner cylinder is filled to the alarm pressure, the liquid level at the moment is the alarm liquid level, the alarm liquid level is higher than the limit liquid level, and the vertical low-temperature storage tank is not fed with liquid through the emergency stop valve in the emergency cutting device; when the emergency cut-off valve in the emergency cut-off device enables the vertical low-temperature storage tank not to feed liquid any more, the gas phase space reserved in the vertical low-temperature storage tank is very narrow, so that the vertical low-temperature storage tank has no safe gas phase space, and therefore great potential safety hazards are caused. Therefore, after the vertical low-temperature storage tank is filled to the liquid level with the set height, the low-temperature liquid still keeps the flow and the flow speed during normal filling, so that the liquid level in the inner cylinder can continuously and rapidly rise to the limit liquid level, the processing time for closing the liquid inlet stop valve on the outer liquid inlet pipe is shortened, the reliability of the anti-overcharging performance of the common overflow mechanism is low, and potential safety hazards are easily caused.
Disclosure of Invention
The utility model aims at: the utility model provides an prevent filling device suitable for among vertical cryogenic tank, this prevent filling device when the liquid level of cryogenic liquid reaches the settlement position, the flow and the velocity of flow of cryogenic liquid in entering the inner tube can significantly reduce for the liquid level of cryogenic liquid rises the speed and slows down greatly, and the liquid level of cryogenic liquid reaches the limit liquid level from the settlement position and just needs longer time, thereby leaves the processing time that closes the feed liquor stop valve on the outer feed liquor pipe of follow-up, and this prevents filling device more reliable than the overflow mechanism's that is used prevents that fills.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: anti-overcharging device suitable for in vertical cryogenic tank includes: the bottom of the inner liquid inlet pipe is provided with a lower baffle plate for sealing the outlet at the bottom end of the inner liquid inlet pipe, a plurality of liquid outlet holes are circumferentially arranged on the side wall of the inner liquid inlet pipe at intervals, a limit filling baffle pipe is sleeved on the inner liquid inlet pipe, the bottom of the limit filling baffle pipe is connected with the lower baffle plate at the periphery of the bottom end of the inner liquid inlet pipe through a compression spring sleeved on the inner liquid inlet pipe, a floating ball below the lower baffle plate is hung on the limit filling baffle pipe through a connecting piece, a lifting gap for facilitating the up-down lifting of the limit filling baffle pipe along the inner liquid inlet pipe is arranged between the limit filling baffle pipe and the inner liquid inlet pipe, and a limiting mechanism is arranged on the inner liquid inlet pipe above the liquid outlet holes; the arrangement modes of the limit filling stop pipe, the compression spring and the floating ball meet the following requirements: when the liquid level in the vertical low-temperature storage tank is lower than the limit filling position, the limit filling baffle pipe does not form shielding to each liquid outlet hole; when the liquid level in the vertical low-temperature storage tank rises to the limit filling position, the limit filling baffle pipe also rises to just block each liquid outlet hole, and then the elasticity of the compression spring can enable the limit filling baffle pipe to continue to rise until the limit filling baffle pipe is blocked by the limit mechanism and does not rise any more, and in the process, the limit filling baffle pipe always keeps blocking each liquid outlet hole.
Further, the overcharge prevention device suitable for use in a vertical cryogenic tank according to the foregoing, wherein: the clearance between the inner side wall of the upper end of the limit filling baffle pipe, the inner side wall of the lower end of the limit filling baffle pipe and the inner liquid inlet pipe is not more than 1mm.
Further, the overcharge prevention device suitable for use in a vertical cryogenic tank according to the foregoing, wherein: the inner side wall of the limit filling baffle pipe is sequentially provided with a vertical section, an inclined section and a liquid outlet section from top to bottom; the inner diameter of the inclined section gradually increases from top to bottom, the inclined section is in a horn shape, the inner diameter of the vertical section is the same as the inner diameter of the top end of the inclined section, and a baffle pipe liquid outlet is arranged in the liquid outlet section; a plurality of auxiliary liquid outlet holes are also arranged on the inner liquid inlet pipe below the liquid outlet holes at intervals; the arrangement mode of the auxiliary liquid outlet hole meets the following requirements: after the low-temperature liquid is not filled to the completion of filling, the filling limiting and blocking pipe always blocks each auxiliary liquid outlet hole.
Further, the overcharge prevention device suitable for use in a vertical cryogenic tank according to the foregoing, wherein: the lateral wall of interior feed liquor pipe is gone up circumference evenly spaced and is provided with 4 play liquid holes, goes out the interior feed liquor pipe of liquid hole below and goes out 2 supplementary play liquid holes of circumference relative.
Further, the overcharge prevention device suitable for use in a vertical cryogenic tank according to the foregoing, wherein: when the liquid level in the vertical low-temperature storage tank rises to the limit filling position, the buoyancy force born by the floating ball is 1.0-1.1 times of the sum of the gravity force of the limit filling pipe, the connecting component and the floating ball.
Further, the overcharge prevention device suitable for use in a vertical cryogenic tank according to the foregoing, wherein: the connecting piece is two vertical suspenders which are positioned at the outer side of the limit filling stop pipe and are oppositely arranged, the top end of each suspender is connected with the top end of the limit filling stop pipe, and the bottom end of each suspender is connected with the top end of each floating ball;
further, the overcharge prevention device suitable for use in a vertical cryogenic tank according to the foregoing, wherein: the limiting mechanism is 2 upper stop blocks which are arranged on the inner liquid inlet pipe above the liquid outlet hole in a circumferential opposite manner.
Further, the overcharge prevention device suitable for use in a vertical cryogenic tank according to the foregoing, wherein: and the pressure gauge for measuring the pressure in the outer liquid inlet pipe and the liquid inlet stop valve are all in communication connection with the controller.
The beneficial effects of the utility model are as follows: 1. when the liquid level of the anti-overcharging device in the vertical low-temperature storage tank rises to the limit charging position, the limit charging baffle pipe just rises to block each liquid outlet hole, so that the pressure in the inner liquid inlet pipe suddenly rises, the flow and the flow speed of low-temperature liquid suddenly reduce, the liquid level rising speed of the low-temperature liquid in the vertical low-temperature storage tank is greatly slowed down, the liquid level of the low-temperature liquid needs longer time from the limit charging position to the limit liquid level, the processing time for the subsequent step of closing the liquid inlet stop valve on the outer liquid inlet pipe is longer, and the anti-overcharging reliability of the anti-overcharging device with the structure is higher. 2. The utility model has the further advantages that: the inner wall of the limit filling baffle pipe is sequentially provided with a vertical section, an inclined section and a liquid outlet section with a baffle pipe liquid outlet from top to bottom, and gaps among the inner side wall of the liquid outlet section where the baffle pipe liquid outlet is positioned, the inner side wall of the vertical section and the outer side wall of the inner liquid inlet pipe are not more than 1mm, so that when the liquid level rises to the limit filling position, the limit filling baffle pipe rises to block each liquid outlet hole, the flow and the flow velocity of low-temperature liquid can be suddenly reduced; after the inclined section is matched with the auxiliary liquid outlet hole, part of resistance of the low-temperature liquid which is subjected to downward flow on the limit filling baffle pipe can be counteracted in the filling process, so that the volume of the floating ball can be greatly reduced by the aid of the compression spring and the auxiliary liquid outlet hole, the inner cavity space of the inner cylinder occupied by the floating ball is further greatly reduced, and the floating ball can be installed conveniently. 3. The utility model has the further advantages that: the outer liquid inlet pipe communicated with the inner liquid inlet pipe is provided with the pressure gauge and the liquid inlet stop valve which are all in communication connection with the controller, when the pressure in the outer liquid inlet pipe is larger than the set pressure, the controller controls the liquid inlet stop valve to be closed, the set pressure is higher than the pressure during normal filling and is smaller than the alarm pressure, thus manual operation is not needed, the time required for the subsequent step of closing the liquid inlet stop valve on the outer liquid inlet pipe is less, the overcharge-preventing reliability is further improved, and the emergency cutting device is not needed to be arranged on the vertical low-temperature storage tank.
Drawings
FIG. 1 is a schematic view of a vertical cryogenic tank equipped with an overfill prevention device according to the present utility model, suitable for use in a vertical cryogenic tank;
FIG. 2 is a schematic diagram of an overcharge prevention device of the vertical cryogenic tank of FIG. 1 when the vertical cryogenic tank is not filled with cryogenic liquid;
FIG. 3 is a schematic structural view of an overcharge prevention device in which the liquid level does not reach the charge limit position but the floating ball is subjected to the floating force of the low-temperature liquid;
FIG. 4 is a schematic structural view of the overcharge-preventing device after the completion of the filling;
fig. 5 is a schematic cross-sectional view of the filling tube.
Description of the embodiments
The technical scheme of the utility model is further described below with reference to the attached drawings and the preferred embodiments.
As shown in fig. 1, a vacuum interlayer is formed between an inner cylinder 1 and an outer cylinder 2 of the vertical cryogenic storage tank, a distribution head 22 is arranged in a central through hole of an outer upper seal head 21 of the outer cylinder 2, a vertical support neck pipe 3 is arranged in a central through hole of an inner upper seal head 11 of the inner cylinder 1, the top end of the support neck pipe 3 extends into the vacuum interlayer and is fixed with the bottom of the distribution head 22 in a sealing manner, and the inner cylinder 1 and the outer cylinder 2 are connected with each other through the support neck pipe 3. The outer liquid inlet pipe 4 and the inner liquid inlet pipe 5 are in butt joint through corresponding connecting channels in the distribution head 22, the inner liquid inlet pipe 5 vertically penetrates through the inner cavity of the vertical support neck pipe 3 up and down, and the bottom end of the inner liquid inlet pipe extends into the inner cavity of the inner cylinder 1 of the vertical low-temperature storage tank.
As shown in fig. 2, 3 and 4, the bottom of the inner liquid inlet pipe 5 is provided with a lower baffle plate 51 sealing the outlet at the bottom end of the inner liquid inlet pipe 5, a plurality of liquid outlet holes 52 are circumferentially arranged on the side wall of the inner liquid inlet pipe 5 at intervals, a limit filling baffle pipe 6 is sleeved on the inner liquid inlet pipe 5, the bottom of the limit filling baffle pipe 6 is connected with the lower baffle plate 51 at the periphery of the bottom end of the inner liquid inlet pipe through a compression spring 7 sleeved on the inner liquid inlet pipe 5, a floating ball 8 below the lower baffle plate 51 is hung on the limit filling baffle pipe 6 through a connecting piece, a lifting gap which is convenient for the limit filling baffle pipe 6 to lift up and down along the inner liquid inlet pipe 5 is arranged between the limit filling baffle pipe 6 and the inner liquid inlet pipe 5, and a limiting mechanism is arranged on the inner liquid inlet pipe 5 above the liquid outlet holes 52. In this embodiment, 4 liquid outlet holes 52 are uniformly spaced circumferentially on the side wall of the inner liquid inlet pipe 5, the limiting mechanism is two upper stop blocks 53 which are oppositely arranged circumferentially on the inner liquid inlet pipe 5 above the liquid outlet holes 52, the connecting piece is two vertical hanging rods 91 which are oppositely arranged and are positioned outside the limit filling stop pipe 6, the top ends of the hanging rods 91 are connected with the top ends of the limit filling stop pipe 6, and the bottom ends of the hanging rods 91 are connected with the top ends of the floating balls 8.
When the vertical low-temperature storage tank is not filled with low-temperature liquid, the anti-overcharging device is in a state shown in fig. 2, at the moment, the elastic force on the compression spring 7 is equal to the sum of the gravity of the limit charging baffle pipe 6, the connecting component 9 and the floating ball 8, namely the limit charging baffle pipe 6, the connecting component 9 and the floating ball 8 are supported by the compression spring 7, the compression spring 7 is in a compressed state, and the top end of the limit charging baffle pipe 6 is lower than the liquid outlet 52 without shielding the liquid outlet 52; after the low-temperature liquid starts to be filled, in the process that the floating ball 8 is subjected to the buoyancy action of the low-temperature liquid and the liquid level does not reach the set position, the anti-overcharging device is in the state shown in fig. 3, the sum of buoyancy and elasticity is larger than the sum of the gravity of the limit filling stop pipe 6, the connecting component 9 and the floating ball 8 and the resistance of the low-temperature liquid flowing downwards on the limit filling stop pipe 6, and in the process, the compression spring 7 is still in a compressed state, but the limit filling stop pipe 6 slowly rises, and the limit filling stop pipe 6 does not form shielding on the liquid outlet 52; when the liquid level in the vertical low-temperature storage tank rises to the set position, the limit filling baffle pipe 6 will rise to block each liquid outlet hole 52, so that the flow rate and the flow velocity of the low-temperature liquid in the inner liquid inlet pipe 5 are suddenly reduced, the pressure in the inner liquid inlet pipe 5 is suddenly increased, the buoyancy force borne by the floating ball 8 is not less than the sum of the gravity force of the limit filling baffle pipe 6, the connecting component 9 and the floating ball 8, and then the elasticity on the compression spring 7 still in a compressed state can enable the limit filling baffle pipe 6 to continuously rise until the top of the limit filling baffle pipe 6 is in contact with the upper stop block 53, so that the limit filling baffle pipe 6 is not raised any more, namely, in the state in fig. 4, in the process that the limit filling baffle pipe 6 just blocks each liquid outlet hole 52 until the limit filling baffle pipe rises until the limit mechanism is in contact with the top of the limit filling baffle pipe 6, the limit filling baffle pipe 6 always blocks each liquid outlet hole 52. The liquid outlet holes 52 are uniformly circumferentially arranged, so that the resistance of the low-temperature liquid on the limit filling baffle tube 6 is uniformly distributed circumferentially in the filling process, and the limit filling baffle tube 6 can stably rise. For convenience of description, the set position will be referred to as a limit charging position during the process of charging the cryogenic liquid. The limit filling position is lower than the limit liquid level when the low-temperature liquid reaches 95% of the effective volume of the vertical low-temperature storage tank, and the liquid level when the low-temperature liquid reaches 90% of the effective volume of the vertical low-temperature storage tank is often selected as the limit filling position during actual operation.
In this embodiment, when the liquid level in the vertical cryogenic tank rises to the limit filling position, the buoyancy force received by the floating ball is 1.0-1.1 times of the sum of the gravity force of the limit filling pipe, the connecting component and the floating ball. The design is that the floating ball 8 enters the inner cavity of the inner cylinder 1 from the support neck pipe 3 during installation, so that the outer diameter of the floating ball 8 is required to be smaller than the inner diameter of the support neck pipe 3, and the space of the inner cavity of the inner cylinder 1 is occupied if the floating ball 8 is too large. Since the resistance of the downward flow of the low-temperature liquid received on the stopper tube 6 is large during filling, the compression spring 7 needs to be provided to offset the resistance of the downward flow of the low-temperature liquid received on the stopper tube 6, so that the stopper tube 6 can stably rise.
As shown in fig. 5, the inner wall of the limit filling pipe 6 is provided with a vertical section 61, an inclined section 62 and a liquid outlet section 63 from top to bottom. The inside diameter of the inclined section 62 gradually increases from top to bottom, the inside diameter of the vertical section 61 is the same as the inside diameter of the top end of the inclined section 62, a baffle pipe liquid outlet 64 is arranged in the liquid outlet section 63, when the limit filling baffle pipe 6 is sleeved on the inner liquid inlet pipe 5, the gap between the inner side wall of the liquid outlet section 63 at the position of the baffle pipe liquid outlet 64, the inner side wall of the vertical section 61 and the outer side wall of the inner liquid inlet pipe 5 is not more than 1mm, and thus when the liquid level rises to the limit filling position, namely the limit filling baffle pipe 6 rises to block each liquid outlet hole 52, the flow rate and the flow velocity of low-temperature liquid can be suddenly reduced. A plurality of auxiliary liquid outlet holes 54 are further arranged on the inner liquid inlet pipe 5 below the liquid outlet holes 52 at intervals, in this embodiment, two auxiliary liquid outlet holes 54 are arranged on the inner liquid inlet pipe 5 below the liquid outlet holes 52 circumferentially and oppositely, and after the low-temperature liquid is not filled to the completion of filling, the filling limiting and blocking pipe 6 always blocks each auxiliary liquid outlet hole 54. During filling, as the lifting gap is smaller, the low-temperature liquid flows out from the two auxiliary liquid outlet holes 54 and contacts with the inner wall of the inclined section 62, and the inclined section 62 is acted by upward component force, so that partial resistance of the low-temperature liquid flowing downwards on the limit filling baffle tube 6 is counteracted. In this embodiment, the bottom of the inclined section 62 is the position where the inner diameter of the filling pipe 6 is the largest, and the wall thickness of the filling pipe 6 is no less than the minimum wall thickness required for safe operation of the filling pipe 6. In this embodiment, the limiting mechanism is arranged so that, on one hand, in the process that the limit filling stop pipe 6 is lifted from just blocking each liquid outlet hole 52 to the point that the limiting mechanism contacts with the top of the limit filling stop pipe 6, the limit filling stop pipe 6 always blocks each liquid outlet hole 52, and on the other hand, in the process that the low-temperature liquid is not filled to the completion of filling, the limit filling stop pipe 6 always blocks each auxiliary liquid outlet hole 54.
When the liquid level in the vertical low-temperature storage tank rises to the limit filling position, the limit filling baffle pipe 6 rises to block each liquid outlet hole 52, at the moment, although the low-temperature liquid continues to flow, the flow rate and the flow speed of the low-temperature liquid suddenly decrease, the liquid can need longer time to reach the limit liquid level from the limit filling position, the processing time for closing the liquid inlet stop valve 41 on the outer liquid inlet pipe 4 is longer, the longer reaction time is given for operators, and the overcharge prevention reliability of the structure of the overcharge prevention device is higher.
As shown in fig. 1, the pressure gauge 42 for measuring the pressure in the outer liquid inlet pipe 4 and the liquid inlet stop valve 41 are both in communication connection with the controller, when the pressure gauge 42 measures that the pressure in the outer liquid inlet pipe 4 communicated with the inner liquid inlet pipe 5 is larger than the set pressure, the controller controls the liquid inlet stop valve 41 to be closed, and the set pressure is higher than the pressure in normal filling and is smaller than the alarm pressure. Thus, no manual operation is needed, and the time required for the subsequent step of closing the liquid inlet stop valve 41 on the outer liquid inlet pipe is less, so that the overcharge-preventing reliability is further improved. Meanwhile, the emergency cutting device is not required to be arranged on the vertical low-temperature storage tank.
The utility model has the advantages that: 1. when the liquid level in the vertical low-temperature storage tank rises to the limit filling position, the limit filling baffle pipe 6 just rises to block each liquid outlet hole 52, so that the pressure in the inner liquid inlet pipe 5 suddenly rises, the flow and the flow speed of the low-temperature liquid suddenly reduce, the liquid level rising speed of the low-temperature liquid in the vertical low-temperature storage tank is greatly slowed down, the liquid level of the low-temperature liquid needs longer time from the limit filling position to the limit liquid level, the processing time for the subsequent step of closing the liquid inlet stop valve 41 on the outer liquid inlet pipe 4 is longer, and the overcharge prevention reliability of the structure is higher. 2. The utility model has the further advantages that: the inner wall of the limit filling baffle tube 6 is sequentially provided with a vertical section 61, an inclined section 62 and a liquid outlet section 63 provided with a baffle tube liquid outlet 64 from top to bottom, and gaps among the inner side wall of the liquid outlet section 63 where the baffle tube liquid outlet 64 is positioned, the inner side wall of the vertical section 61 and the outer side wall of the inner liquid inlet tube 5 are not more than 1mm, so that when the liquid level rises to the limit filling position, the limit filling baffle tube 6 rises to block each liquid outlet hole 52, the flow and the flow velocity of low-temperature liquid can be suddenly reduced; after the inclined section 62 is matched with the auxiliary liquid outlet hole 54, part of resistance of the downward low-temperature liquid on the limit filling baffle pipe 6 can be counteracted in the filling process, so that the volume of the floating ball can be greatly reduced by the compression spring 7 and the auxiliary liquid outlet hole 54, the inner cavity space of the inner cylinder 1 occupied by the floating ball 8 is further greatly reduced, and the floating ball can be installed conveniently. 3. The utility model has the further advantages that: the outer liquid inlet pipe 4 communicated with the inner liquid inlet pipe 5 is provided with the pressure gauge 42 and the liquid inlet stop valve 41 which are all in communication connection with the controller, when the pressure in the outer liquid inlet pipe 4 is larger than the set pressure, the controller controls the liquid inlet stop valve 41 to be closed, the set pressure is higher than the pressure in normal filling and is smaller than the alarm pressure, thus manual operation is not needed, the time required for the subsequent step of closing the liquid inlet stop valve on the outer liquid inlet pipe is less, the overcharge-preventing reliability is further improved, and the emergency cutting device is not needed to be arranged on the vertical low-temperature storage tank.
Claims (8)
1. Anti-overcharging device suitable for in vertical cryogenic tank includes: inner feed liquor pipe of vertical setting in the inner tube, its characterized in that: the bottom of the inner liquid inlet pipe is provided with a lower baffle plate for sealing the outlet at the bottom end of the inner liquid inlet pipe, a plurality of liquid outlet holes are circumferentially arranged on the side wall of the inner liquid inlet pipe at intervals, a limit filling baffle pipe is sleeved on the inner liquid inlet pipe, the bottom of the limit filling baffle pipe is connected with the lower baffle plate at the periphery of the bottom end of the inner liquid inlet pipe through a compression spring sleeved on the inner liquid inlet pipe, a floating ball below the lower baffle plate is hung on the limit filling baffle pipe through a connecting piece, a lifting gap which is convenient for the limit filling baffle pipe to lift up and down along the inner liquid inlet pipe is arranged between the limit filling baffle pipe and the inner liquid inlet pipe, and a limiting mechanism is arranged on the inner liquid inlet pipe above the liquid outlet holes; the arrangement modes of the limit filling stop pipe, the compression spring and the floating ball meet the following requirements: when the liquid level in the vertical low-temperature storage tank is lower than the limit filling position, the limit filling baffle pipe does not form shielding to each liquid outlet hole; when the liquid level in the vertical low-temperature storage tank rises to the limit filling position, the limit filling baffle pipe also rises to just block each liquid outlet hole, and then the elasticity of the compression spring can enable the limit filling baffle pipe to continue to rise until the limit filling baffle pipe is blocked by the limit mechanism and does not rise any more, and in the process, the limit filling baffle pipe always keeps blocking each liquid outlet hole.
2. The overcharge protection device suitable for use in a vertical cryogenic tank of claim 1, wherein: the clearance between the inner side wall of the upper end of the limit filling baffle pipe, the inner side wall of the lower end of the limit filling baffle pipe and the inner liquid inlet pipe is not more than 1mm.
3. The overcharge protection device suitable for use in a vertical cryogenic tank of claim 2, wherein: the inner side wall of the limit filling baffle pipe is sequentially provided with a vertical section, an inclined section and a liquid outlet section from top to bottom; the inner diameter of the inclined section gradually increases from top to bottom, the inclined section is in a horn shape, the inner diameter of the vertical section is the same as the inner diameter of the top end of the inclined section, and a baffle pipe liquid outlet is arranged in the liquid outlet section; a plurality of auxiliary liquid outlet holes are also arranged on the inner liquid inlet pipe below the liquid outlet holes at intervals; the arrangement mode of the auxiliary liquid outlet hole meets the following requirements: after the low-temperature liquid is not filled to the completion of filling, the filling limiting and blocking pipe always blocks each auxiliary liquid outlet hole.
4. An overcharge protection device suitable for use in a vertical cryogenic tank as recited in claim 3, wherein: the lateral wall of interior feed liquor pipe is gone up circumference evenly spaced and is provided with 4 play liquid holes, goes out the interior feed liquor pipe of liquid hole below and goes out 2 supplementary play liquid holes of circumference relative.
5. The overfill prevention device for use in a vertical cryogenic tank of claim 1 or 2 or 3 or 4, wherein: when the liquid level in the vertical low-temperature storage tank rises to the limit filling position, the buoyancy force born by the floating ball is 1.0-1.1 times of the sum of the gravity force of the limit filling pipe, the connecting component and the floating ball.
6. The overfill prevention device for use in a vertical cryogenic tank of claim 1 or 2 or 3 or 4, wherein: the connecting piece is located the outside of limit fills the fender pipe, two vertical jib that set up relatively, and the top of jib is connected with the top of limit filling the fender pipe, and the bottom of jib is connected with the top of floater.
7. The overfill prevention device for use in a vertical cryogenic tank of claim 1 or 2 or 3 or 4, wherein: the limiting mechanism is 2 upper stop blocks which are arranged on the inner liquid inlet pipe above the liquid outlet hole in a circumferential opposite manner.
8. The overfill prevention device for use in a vertical cryogenic tank of claim 1 or 2 or 3 or 4, wherein: and the pressure gauge for measuring the pressure in the outer liquid inlet pipe and the liquid inlet stop valve are all in communication connection with the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223016976.7U CN219222066U (en) | 2022-11-14 | 2022-11-14 | Overcharge preventing device suitable for vertical low-temperature storage tank |
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| CN202223016976.7U CN219222066U (en) | 2022-11-14 | 2022-11-14 | Overcharge preventing device suitable for vertical low-temperature storage tank |
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| CN219222066U true CN219222066U (en) | 2023-06-20 |
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| GR01 | Patent grant | ||
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| TR01 | Transfer of patent right |
Effective date of registration: 20231206 Address after: 215600 Fuxin (morning) road 19, Yang Shi Town, Zhangjiagang City, Suzhou, Jiangsu. Patentee after: Zhangjiagang Furui New Energy Technology Co.,Ltd. Address before: Zhangjiagang Furui New Energy Technology Co., Ltd., No. 19 Fuxin (Chenxin) Road, Yangshe Town, Zhangjiagang City, Suzhou City, Jiangsu Province, 215600 Patentee before: Zhangjiagang Furui New Energy Technology Co.,Ltd. Patentee before: ZHANGJIAGANG FURUI CRYOGENIC TECHNOLOGY Co.,Ltd. |