Anti-scour liquid inlet pipe assembly in low-temperature storage tank

Abstract

The utility model discloses an anti-scour liquid inlet pipe component in a low-temperature storage tank, which comprises a connecting pipe and a spraying pipe, the pipe diameter of the connecting pipe is not larger than that of the spraying pipe, the length of the spraying pipe is larger than that of the spraying pipe, the spraying pipe is horizontally arranged, a liquid inlet hole is arranged on the upper side wall of the spraying pipe, the connecting pipe is welded with the liquid inlet hole, and the connecting pipe is connected with the spraying pipe. A plurality of liquid outlet holes are formed in the lower side wall of the spraying pipe, the left end and the right end of the spraying pipe are each provided with a sealing plate in a full welding mode, connecting plates are arranged between the ends of the spraying pipe and the sealing plates in a clamped mode, and an upper hollowed-out plate, a middle hollowed-out plate and a lower hollowed-out plate are sequentially arranged between the two connecting plates from top to bottom. The low-temperature liquefied gas filling device has the advantages that the flow speed of low-temperature liquefied gas can be effectively reduced, and the low-temperature storage tank and the liquid level are prevented from being impacted in the filling process.

Description

Technical Field

[0001] The utility model relates to the field of pressure vessels, in particular to an anti-flushing liquid inlet pipe assembly in a low-temperature storage tank. Background Art

[0002] A cryogenic storage tank is a device used to store and transport cryogenic liquefied gases such as liquid nitrogen, liquid oxygen, and LNG. In the process of filling the cryogenic liquefied gas into the cryogenic storage tank, the cryogenic liquefied gas will not only cause severe impact on the inner cylinder of the cryogenic storage tank, causing excessive cold and heat stress on the inner cylinder, but also cause a large impact on the liquid surface in the cryogenic storage tank, causing boiling, and making the pressure in the cryogenic storage tank unstable. In order to solve the above problems, our company applied for a cryogenic liquid storage tank with an anti-impact spray device with a publication number of CN110939855A in 2019. The anti-impact spray device is provided on the filling component, and the anti-impact spray device includes: a transition pipe and a pipe cap, and a buffer hole is provided on the pipe cap. After the cryogenic liquefied gas enters the pipe cap of the anti-impact spray device from the filling component, the flow rate is reduced due to the increase in space, and the buffer hole diverts it, thereby reducing the flow rate of the cryogenic liquefied gas, preventing impact on the cryogenic storage tank and the liquid surface. However, during subsequent use, it was found that due to the small inner cavity of the tube cap, the cryogenic liquefied gas entering the tube cap could not get enough space to diffuse. Therefore, when the tube cap was filled with cryogenic liquefied gas, the speed reduction effect of the cryogenic liquefied gas was not obvious, and it would still cause a strong impact on the liquid surface and the cryogenic storage tank. Utility Model Content

[0003] The utility model aims to provide an anti-impact liquid inlet pipe assembly in a cryogenic storage tank which can effectively reduce the flow rate of cryogenic liquefied gas during filling so as to prevent impact on the cryogenic storage tank and the liquid surface.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an anti-impact liquid inlet pipe assembly in a low-temperature storage tank, including: a connecting pipe and a spray pipe, the diameter of the connecting pipe is not larger than the diameter of the spray pipe, the length of the spray pipe is larger than the diameter of the spray pipe, the spray pipe is horizontally arranged, a liquid inlet hole is opened on the upper side wall of the spray pipe, the connecting pipe is welded to the liquid inlet hole, a plurality of liquid outlet holes are opened on the lower side wall of the spray pipe, a sealing plate is fully welded at the left and right ends of the spray pipe, a connecting plate is clamped between the end of the spray pipe and the sealing plate, and an upper hollow plate, a middle hollow plate and a lower hollow plate are arranged in sequence from top to bottom between the two connecting plates.

[0005] Furthermore, in the aforementioned anti-inrush liquid pipe assembly in the low-temperature storage tank, a plurality of first long hollow holes extending left and right are arranged at intervals from front to back in the upper hollow plate, a plurality of second long hollow holes extending front and back are arranged at intervals from left to right in the middle hollow plate, and a plurality of third hollow holes extending left and right are arranged at intervals from front to back in the lower hollow plate, wherein the width of the first hollow hole is greater than the width of the second hollow hole, and the width of the second hollow hole is greater than the width of the third hollow hole.

[0006] Furthermore, in the aforementioned anti-liquid inflow pipe assembly in the low-temperature storage tank, gaps are left between the upper hollow plate, the middle hollow plate and the lower hollow plate and the front and rear inner walls of the spray pipe.

[0007] Furthermore, in the aforementioned anti-flushing liquid inlet pipe assembly in the low-temperature storage tank, a plurality of liquid outlet holes are provided on the upper side wall of the spray pipe.

[0008] Furthermore, in the aforementioned anti-liquid inflow pipe assembly in the low-temperature storage tank, an annular groove is provided at the end of the spray pipe, a connecting plate is clamped in the annular groove, the connecting plate is flush with the end of the spray pipe, and the sealing plate is simultaneously against the end of the spray pipe and the connecting plate, three connecting through holes are sequentially provided on the connecting plate from top to bottom, and the upper hollow plate, the middle hollow plate and the lower hollow plate are respectively clamped in the three connecting through holes.

[0009] Furthermore, in the aforementioned anti-liquid inflow pipe assembly in the low-temperature storage tank, a guide block is respectively provided on the upper and lower side walls of the connecting plate, and a guide groove is respectively provided on the upper and lower side walls of the annular groove, and the two guide blocks on the connecting plate are respectively clamped in the two guide grooves of the annular groove.

[0010] Furthermore, in the aforementioned anti-inrush liquid inlet pipe assembly in the low-temperature storage tank, the upper hollow plate, the middle hollow plate and the lower hollow plate are all in the shape of an arc that bulges upward, and the connecting through hole on the connecting plate is also in the shape of an arc that bulges upward.

[0011] The advantages of the utility model are as follows: by increasing the length of the spray pipe and placing it horizontally, the lateral space of the spray pipe can be increased, so that the low-temperature liquefied gas entering the spray pipe has enough space to diffuse in the horizontal direction, thereby slowing down its flow speed; the flow speed of the low-temperature liquefied gas is further reduced by the blocking and diversion effects of the upper hollow plate, the middle hollow plate and the lower hollow plate; when the spray pipe is full of low-temperature liquefied gas, it can be diverted and flowed out from the liquid outlet holes on the upper side wall, and when the low-temperature liquefied gas flows in the spray pipe, it collides with the hollow plates to generate turbulence and reduce the speed. After the flow speed of the low-temperature liquefied gas is reduced, the low-temperature liquefied gas will not cause a strong impact force on the low-temperature storage tank and the liquid surface after being sprayed out from the liquid outlet holes, and the pressure in the low-temperature storage tank is stabilized during the entire filling process. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The utility model is a structural schematic diagram of an anti-flushing liquid inlet pipe assembly in a low-temperature storage tank.

[0013] Figure 2 yes Figure 1 Schematic diagram of the local enlarged structure in the A direction.

[0014] Figure 3 It is a schematic diagram of the connection structure between the connecting plate and the sprinkler pipe.

[0015] Figure 4 yes Figure 1 Schematic diagram of the structure of the upper middle hollow plate from a top view.

[0016] Figure 5 yes Figure 1 Schematic diagram of the structure of the central hollow plate from a top view.

[0017] Figure 6 yes Figure 1 Schematic diagram of the structure of the middle and lower hollow plates from a top view. DETAILED DESCRIPTION

[0018] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and preferred embodiments.

[0019] like Figure 1 to Figure 6As shown, the anti-rushing liquid inlet pipe assembly in the low-temperature storage tank described in the utility model includes: a connecting pipe 1 and a spray pipe 2, the diameter of the connecting pipe 1 is not greater than the diameter of the spray pipe 2, and the length of the spray pipe 2 is greater than the diameter of the spray pipe 2. In this embodiment, the length of the spray pipe 2 is 4 to 5 times the diameter of the spray pipe 2, and the spray pipe 2 is horizontally placed, so that a larger horizontal liquid storage volume can be provided, so that the low-temperature liquefied gas entering the spray pipe 2 has enough space to diffuse in the horizontal direction, and a liquid inlet hole is opened on the upper side wall of the spray pipe 2, and the connecting pipe 1 is welded to the liquid inlet hole. The welding method is full welding to improve the sealing performance between the connecting pipe 1 and the spray pipe 2. A plurality of liquid outlet holes 21 are also opened on the upper side wall of the spray pipe 2, and a plurality of liquid outlet holes 21 are also opened on the lower side wall of the spray pipe 2. Annular grooves 22 are provided on the left and right ends of the spray pipe 2. A connecting plate 3 is clamped in the annular groove 22. The connecting plate 3 is flush with the end of the spray pipe 2. Three connecting through holes are sequentially arranged on the connecting plate 3 from top to bottom. The connecting through holes are in an arc shape that bulges upward. Upper through holes are respectively clamped between the connecting through holes aligned left and right on the two connecting plates 3. The hollow plate 31, the middle hollow plate 32 and the lower hollow plate 33, the upper hollow plate 31, the middle hollow plate 32 and the lower hollow plate 33 are all in an arc shape that bulges upward. The upper hollow plate 31, the middle hollow plate 32 and the lower hollow plate 33 are designed to be in an arc shape that bulges upward. After being impacted by the low-temperature liquefied gas, the impact force can be better dispersed, and the ability to resist dynamic loads is improved. There are gaps between the upper hollow plate 31, the middle hollow plate 32 and the lower hollow plate 33 and the front and rear inner walls of the spray pipe 2. A plurality of first hollow plates extending left and right are arranged in the upper hollow plate 31 from front to back. A long hollow hole 311, a plurality of second long hollow holes 321 extending forward and backward are arranged at intervals from left to right in the middle hollow plate 32, a plurality of third hollow holes 331 extending left and right are arranged at intervals from front to back in the lower hollow plate 33, the width of the first hollow hole 311 is greater than the width of the second hollow hole 321, the width of the second hollow hole 321 is greater than the width of the third hollow hole 331, and a sealing plate 4 is respectively arranged on the left and right ends of the spray pipe 2, the sealing plate 4 abuts against the end of the spray pipe 2 and the connecting plate 3 on the same side, and is fully welded to the end of the spray pipe 2.

[0020] During assembly, the connecting pipe 1 is first welded to the spray pipe 2 by full welding, the weld is polished, and then the welding slag dropped into the spray pipe 2 is removed, and then a connecting plate 3 is inserted into the annular groove 22 at one end of the spray pipe 2. In order to ensure that the three connecting through holes on the connecting plate 3 are in longitudinal alignment, a guide block 34 is respectively provided on the upper and lower side walls of the connecting plate 3, and a guide groove 221 is respectively provided on the upper and lower side walls of the annular groove 22. The two guide blocks 34 on the connecting plate 3 are respectively inserted into the two guide grooves 221 of the annular groove 22. In this way, the connecting plate 3 will not rotate after being inserted into the annular groove 22, and then one end of the upper hollow plate 31, the middle hollow plate 32 and the lower hollow plate 33 are separated. The three connecting holes of the connecting plate 3 are inserted separately, and then the other connecting plate 3 is inserted into the annular groove 22 at the other end of the spray pipe 2. The guide block 34 is also used to cooperate with the guide groove 221 to limit the position. The other ends of the upper hollow plate 31, the middle hollow plate 32 and the lower hollow plate 33 are inserted into the three connecting holes of the connecting plate 3, and then a sealing plate 4 is respectively abutted on the left and right ends of the spray pipe 2. The sealing plate 4 also abuts on the connecting plate 3 on the same side and cooperates with the end of the spray pipe 2 to fix the connecting plate 3. The sealing plate 4 is sealed and set on the end of the spray pipe 2 by full welding, and then the weld between the sealing plate 4 and the spray pipe 2 is polished. Finally, the connecting pipe 1 is connected to the filling assembly of the cryogenic liquid storage tank.

[0021] During filling, the cryogenic liquefied gas quickly enters the connecting pipe 1 through the filling assembly, and then enters the spray pipe 2. Due to the increase in the inner cavity of the spray pipe 2, the cryogenic liquefied gas has enough space to diffuse, which reduces the flow rate of the cryogenic liquefied gas and achieves the first speed reduction. When the cryogenic liquefied gas touches the upper hollow plate 31, the upper hollow plate 31 not only has a certain blocking effect on the cryogenic liquefied gas and consumes the kinetic energy of the cryogenic liquefied gas, but also the first hollow hole 311 in the upper hollow plate 31 can also The liquefied gas is diverted to achieve a second deceleration. When the low-temperature liquefied gas contacts the middle hollow plate 32, since the first hollow hole 311 in the upper hollow plate 31 and the second hollow hole 321 in the middle hollow plate 32 have different directions and sizes, the low-temperature liquefied gas flowing down from the upper hollow plate 31 will be blocked by the middle hollow plate 32 to consume kinetic energy, and the second hollow hole 321 in the middle hollow plate 32 diverts the low-temperature liquefied gas for a second time, thereby achieving a third deceleration. When the low-temperature liquefied gas contacts the lower hollow plate 31, the low-temperature liquefied gas is diverted to the lower hollow plate 31. When the plates 33 are in contact, since the second hollow hole 321 in the middle hollow plate 32 and the third hollow hole 331 in the lower hollow plate 33 have different directions and sizes, the low-temperature liquefied gas flowing down from the middle hollow plate 32 will be blocked by the lower hollow plate 33 to consume kinetic energy, and the third hollow hole 331 in the lower hollow plate 33 performs a third diversion of the low-temperature liquefied gas, thereby achieving a fourth deceleration. Under the effect of the fourth deceleration, the flow rate of the low-temperature liquefied gas in the spray pipe 2 is low, and finally diverted from the liquid outlet hole 21 on the lower side wall. The fifth deceleration is achieved when the flow rate of the cryogenic liquefied gas is low and will not cause impact on the cryogenic storage tank and the liquid level. Since the connecting plate 3 and the annular groove 22 are limited by the clamping structure between the guide block 34 and the guide groove 221, the upper hollow plate 31, the middle hollow plate 32 and the lower hollow plate 33 will not rotate in the annular groove 22 when impacted by the cryogenic liquefied gas, thereby ensuring that the upper hollow plate 31, the middle hollow plate 32 and the lower hollow plate 33 are always in a longitudinally aligned state.

[0022] When the cryogenic liquefied gas in the filling assembly flows too fast and causes the spray pipe 2 to be filled with cryogenic liquefied gas, part of the cryogenic liquefied gas in the spray pipe 2 can be diverted and flowed out from the liquid outlet hole 21 on the upper side wall. When the cryogenic liquefied gas flows out from the liquid outlet hole 21 on the upper side wall, it needs to overcome gravity before it can flow out. Therefore, the flow rate of the cryogenic liquefied gas diverted and flowing out from the liquid outlet hole 21 on the upper side wall is relatively low, and will not cause a strong impact on the cryogenic storage tank and the liquid level. The cryogenic liquefied gas entering the spray pipe 2 will flow in the spray pipe 2, and will flow during the flow process. The collision with the upper hollow plate 31, the middle hollow plate 32 and the lower hollow plate 33 will form turbulence in multiple directions in the first hollow hole 311, the second hollow hole 321 and the third hollow hole 331 and the gaps between the upper hollow plate 31, the middle hollow plate 32 and the lower hollow plate 33 and the front and rear inner walls of the spray pipe 2. The collision between the turbulence will consume the kinetic energy of the cryogenic liquefied gas, thereby reducing its flow rate, and finally it will flow out from the liquid outlet 21 on the lower side wall. At this time, the flow rate of the cryogenic liquefied gas is also relatively low and will not cause impact on the cryogenic storage tank and the liquid level.

[0023] After filling is completed, since the upper hollow plate 31, the middle hollow plate 32 and the lower hollow plate 33 are all in an upwardly convex arc shape, the low-temperature liquefied gas will not remain on the upper hollow plate 31, the middle hollow plate 32 and the lower hollow plate 33, and will flow to the lower side wall of the spray pipe 2 through the gaps and their respective hollow holes.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not depart from the spirit and scope of the utility model should be included in the scope of protection of the claims of the utility model.

Claims

1. Anti-flushing liquid inlet pipe assembly in a cryogenic storage tank, characterized in that: include: A connecting pipe and a spray pipe, the diameter of the connecting pipe is not larger than the diameter of the spray pipe, the length of the spray pipe is larger than the diameter of the spray pipe, the spray pipe is horizontally placed, a liquid inlet hole is opened on the upper side wall of the spray pipe, the connecting pipe is welded to the liquid inlet hole, a plurality of liquid outlet holes are opened on the lower side wall of the spray pipe, a sealing plate is fully welded at the left and right ends of the spray pipe respectively, a connecting plate is clamped between the end of the spray pipe and the sealing plate, and an upper hollow plate, a middle hollow plate and a lower hollow plate are arranged in sequence from top to bottom between the two connecting plates.

2. The anti-flushing liquid inlet pipe assembly in a cryogenic storage tank according to claim 1, characterized in that: A number of first long hollow holes extending left and right are arranged at intervals from front to back in the upper hollow plate, a number of second long hollow holes extending front and back are arranged at intervals from left to right in the middle hollow plate, and a number of third hollow holes extending left and right are arranged at intervals from front to back in the lower hollow plate, the width of the first hollow hole is greater than the width of the second hollow hole, and the width of the second hollow hole is greater than the width of the third hollow hole.

3. The anti-flushing liquid inlet pipe assembly in a cryogenic storage tank according to claim 1 or 2, characterized in that: Gaps are left between the upper hollow plate, the middle hollow plate and the lower hollow plate and the front and rear inner side walls of the spray pipe.

4. The anti-flushing liquid inlet pipe assembly in a cryogenic storage tank according to claim 1, characterized in that: A plurality of liquid outlet holes are provided on the upper side wall of the spray pipe.

5. The anti-flushing liquid inlet pipe assembly in a cryogenic storage tank according to claim 3, characterized in that: An annular groove is provided at the end of the spray pipe, and the connecting plate is clamped in the annular groove. The connecting plate is flush with the end of the spray pipe, and the sealing plate rests on the end of the spray pipe and the connecting plate at the same time. Three connecting through holes are arranged on the connecting plate from top to bottom, and the upper hollow plate, the middle hollow plate and the lower hollow plate are respectively clamped in the three connecting through holes.

6. The anti-flushing liquid inlet pipe assembly in a cryogenic storage tank according to claim 5, characterized in that: A guide block is respectively arranged on the upper and lower side walls of the connecting plate, a guide groove is respectively arranged on the upper and lower side walls of the annular clamping groove, and the two guide blocks on the connecting plate are respectively clamped in the two guide grooves of the annular clamping groove.

7. The anti-flushing liquid inlet pipe assembly in a cryogenic storage tank according to claim 6, characterized in that: The upper hollow plate, the middle hollow plate and the lower hollow plate are all in an arc shape that bulges upwards, and the connecting through holes on the connecting plate are also in an arc shape that bulges upwards.

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