A longitudinal support device for a large-capacity railway cryogenic tank car

Abstract

The present invention discloses a longitudinal support device for a large-capacity railway cryogenic tank car. The longitudinal support device connects an inner head and an outer head and is located at the center of the inner and outer heads. The longitudinal support device includes a support flange, a longitudinal tensile bearing frame, a heat insulation component, and a longitudinal push-pull support seat. The present invention can avoid opening a mounting hole in the head of the tank body, thereby maintaining the integrity of the inner head. The longitudinal support device is located at the center of the head on one side of the tank body. When subjected to a longitudinal load of 2500KN in the second railway working condition, the inner and outer tank bodies are subjected to more uniform force in the axial direction. The longitudinal support device effectively reduces heat leakage from the cryogenic tank body and improves the thermal insulation performance of the cryogenic tank body.

Description

Technical Field

[0001] The present invention belongs to the field of railway transportation technology, and specifically relates to a longitudinal connection device for the inner and outer tank bodies of a cryogenic tank body of a cryogenic liquid railway tank car. The temperature of the medium loaded in the cryogenic liquid railway tank car is -253°C or below. Background Art

[0002] Existing cryogenic liquid railway tank cars, such as: 85m 3 Liquid hydrogen rail transport and refueling vehicles utilize a double-ended ball-jointed unit as the longitudinal support for the inner and outer tanks. The installation of this support structure requires mounting holes in the inner head, which compromises the integrity of the inner head and impacts its uniformity. Furthermore, the connecting welds are susceptible to failure under fatigue loads, leading to leakage in the inner tank and vacuum failure in the tank interlayer. Furthermore, the double-ended ball-jointed longitudinal support has a large number of parts, requiring significant installation effort on the tank head. After installation, flaw detection and inspection of the welds connecting the inner and outer tanks present difficulties, increasing the workload on the construction site and raising production costs. The location where the double-ended ball-jointed longitudinal support is welded to the inner container head is a structural discontinuity with peak stress. Consequently, fatigue cracks may develop at this structural discontinuity during repeated loading, increasing the risk of inner container failure. This support structure significantly complicates the assembly, welding, and inspection of the inner and outer tanks, reducing production efficiency and increasing the difficulty and workload of inspection.

[0003] Existing cryogenic liquid road tankers, such as: 300m 3 For liquid hydrogen transport tank trucks, the longitudinal support structure between the inner and outer tanks consists of two supports at the top and bottom ends of the cylinder near one side head. The disadvantages of this support structure are: 1. It is necessary to open installation holes on the inner tank body, which makes the flaw detection of the inner tank body difficult and increases the workload; 2. This support structure consists of two supports at the top and bottom ends of the cylinder near one side head, which increases the thermal bridge path between the inner and outer tank bodies, increases the heat leakage of the entire low-temperature tank system, and thus shortens the damage-free storage time of the low-temperature tank body. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a longitudinal support device for a large-volume railway cryogenic tank car to solve the problems that the support structure of the existing cryogenic tank car will destroy the integrity of the inner tank body, causing difficulties in the assembly, welding and inspection of the inner and outer tank bodies, and shortening the damage-free storage time of the cryogenic tank body.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A longitudinal support device for a large-volume railway cryogenic tank car, the longitudinal support device connecting the inner head and the outer head and located at the center of the inner head and the outer head; the longitudinal support device includes a support flange, a longitudinal tensile bearing frame, a heat insulation component and a longitudinal push-pull support seat;

[0007] The supporting flange passes through and is fixed at the center of the outer head and is coaxial with the tank body;

[0008] The longitudinal stretching bearing frame includes a front plate, a rear plate, an arc-shaped plate I, and an arc-shaped plate II; the front plate and the rear plate are parallel to each other, the arc-shaped plate I connects the upper end of the front plate and the upper end of the rear plate, and the arc-shaped plate II connects the lower end of the front plate and the lower end of the rear plate; a longitudinal through hole is provided in the center of the front plate; the longitudinal stretching bearing frame is coaxial with the support flange, and the support flange is sleeved on the front end of the longitudinal stretching bearing frame and the two are connected;

[0009] The thermal insulation assembly is arranged in the longitudinal stretch bearing frame, the front end of the thermal insulation assembly is connected to the front plate and the support flange through a longitudinal baffle, and the rear end is connected to the rear plate; the thermal insulation assembly includes a front thermal insulation pad group and a rear anti-shear thermal insulation assembly arranged front and back and parallel to each other, and a thermal insulation sleeve assembly vertically passing through the front thermal insulation pad group and the rear anti-shear thermal insulation assembly; the rear anti-shear thermal insulation assembly includes a front anti-shear plate, a rear thermal insulation pad group, a rear anti-shear plate and a rear thermal insulation pad arranged in sequence from front to back and parallel to each other; the left and right sides of the rear anti-shear thermal insulation assembly extend out of the longitudinal stretch bearing frame; the rear end of the thermal insulation sleeve assembly is mounted on the rear plate;

[0010] There are two groups of longitudinal push-pull support seats, which are symmetrically arranged on the left and right sides of the insulation assembly. The longitudinal push-pull support seats include a U-shaped plate and two support legs. The two support legs are connected to the U-shaped plate and extend to the rear of the U-shaped plate; the opening of the U-shaped plate faces the insulation assembly and the side end of the rear anti-shear insulation assembly is located between the two side plates of the U-shaped plate, and a side insulation pad is provided between the bottom plate of the U-shaped plate and the end of the rear anti-shear insulation assembly; the rear end of the support leg is connected to the inner head.

[0011] The present invention also includes the following technical features:

[0012] Specifically, two supporting flange ears are provided on the inner wall of the supporting flange, and the two supporting flange ears correspond to the front plates on both sides of the longitudinal through hole respectively; the supporting flange ears, the front plate and the longitudinal baffle are connected by bolts; thermal insulation pads are provided between the front plate and the supporting flange ears, and between the supporting flange ears and the longitudinal baffle; the longitudinal baffle is installed on the inner side of the supporting flange ears, and the front plate of the longitudinal stretching bearing frame is installed on the outer side of the supporting flange ears.

[0013] Specifically, the arc openings of the arc plate I and the arc plate II of the longitudinal stretching bearing frame are opposite and symmetrically distributed up and down; the distance between the arc plate I and the arc plate II is greater than the height of the thermal insulation component, so that the thermal insulation component can be placed in the longitudinal stretching bearing frame and the left and right sides of the rear anti-shear insulation component extend out of the longitudinal stretching bearing frame; the edge of the front plate is circular, the upper and lower edges of the rear plate are arc-shaped, the left and right edges of the rear plate are vertical lines, and the left and right widths of the rear plate are equal to the left and right widths of the arc plate I.

[0014] Specifically, the front thermal insulation pad group of the thermal insulation assembly is a plurality of front thermal insulation pads stacked in parallel with each other; the rear thermal insulation pad group is a plurality of rear thermal insulation pads stacked in parallel with each other, and the width of the rear thermal insulation pad is greater than the width of the front thermal insulation pad; the front anti-shear plate, rear thermal insulation pad and rear anti-shear plate have the same shape; front end thermal insulation pads are provided at the left and right ends of the front wall of the front anti-shear plate, and the front end thermal insulation pad is located between the side plate of the U-shaped plate and the front anti-shear plate; rear end thermal insulation pads are provided at the left and right ends of the rear wall of the rear anti-shear plate, and the rear end thermal insulation pad is located between the side plate of the U-shaped plate and the rear anti-shear plate.

[0015] Specifically, the front insulation pad group, the rear insulation pad group, the front end insulation pad and the rear end insulation pad are all made of fiberglass, and the front anti-shear plate and the rear anti-shear plate are made of stainless steel; the front end insulation pad is fixed to the front anti-shear plate by bolts, and the rear end insulation pad is fixed to the rear anti-shear plate by bolts.

[0016] Specifically, the thermal insulation sleeve assembly includes a single-head stud and an external thermal insulation sleeve thereof; the thermal insulation sleeve assembly has four groups, namely, a coaxial upper front thermal insulation sleeve assembly and an upper rear thermal insulation sleeve assembly, and a coaxial lower front thermal insulation sleeve assembly and a lower rear thermal insulation sleeve assembly; the rear end of the single-head stud in the upper front thermal insulation sleeve assembly does not contact the front end of the single-head stud in the upper rear thermal insulation sleeve assembly; the rear end of the single-head stud in the lower front thermal insulation sleeve assembly does not contact the front end of the single-head stud in the lower rear thermal insulation sleeve assembly.

[0017] Specifically, reinforcing ribs are provided at the junction of the side plates and the bottom plate of the U-shaped plate of the longitudinal push-pull support seat; and supporting leg reinforcing ribs are provided on the supporting legs.

[0018] Specifically, the outer end of the support flange is sealed with one end of the support protective tube, and the other end of the support protective tube is welded with a small support head, and the support protective tube and the small support head are located outside the outer head; the small support head, the support protective tube, the support flange and the outer head are sealed in sequence to close the interlayer space between the outer tank body and the inner tank body.

[0019] Specifically, the support flange, the longitudinal baffle, the longitudinal tensile bearing frame and the two longitudinal push-pull support seats form a cross-clamping wrapping structure to wrap the thermal insulation assembly therein.

[0020] Specifically, there are gaps between the front side plate of the U-shaped plate and the thermal insulation pad at the front end, and between the rear side plate of the U-shaped plate and the thermal insulation pad at the rear end.

[0021] Compared with the prior art, the present invention has the following technical effects:

[0022] 1. The installation of the longitudinal support device of the present invention avoids the need to machine mounting holes on the inner tank head, thereby ensuring the integrity of the inner tank head, reducing the difficulty of subsequent flaw detection and air tightness inspection, and reducing the labor intensity of on-site construction personnel.

[0023] 2. The longitudinal support device of the present invention has only one installation, compared with the existing 300m 3 Liquid hydrogen transport tank truck, the present invention reduces the thermal bridge path between the inner tank and the outer tank, thereby effectively reducing the heat leakage of the inner tank, thereby greatly improving the low-temperature performance of the low-temperature tank; in terms of installation position, the longitudinal support device of the present invention is installed at the center of the head at one end of the tank, compared with the existing 300m 3 In liquid hydrogen transport tank truck products, two longitudinal auxiliary supports need to be installed at the top and bottom ends of the cylinder close to one end of the tank head. The on-site construction and installation difficulty of the longitudinal support device of the present invention is lower and the quality after construction is more guaranteed, which also greatly reduces the subsequent after-sales maintenance costs.

[0024] 3. The longitudinal support device of the present invention is installed at the center of the head at one end of the tank body. Under the impact load of 2500KN in the second railway working condition, the stress on the inner and outer tank bodies of the cryogenic railway tank car is more reasonable, thereby better ensuring the reliability of the tank body structure of the cryogenic tank car. For cryogenic liquid railway tank cars, higher structural reliability can more effectively ensure the safe operation of cryogenic railway tank cars.

[0025] 4. In the longitudinal support device of the present invention, during the entire design life cycle of the cryogenic railway tank car, each time the longitudinal support device is overhauled, the support protective tube can effectively ensure that the supporting small head and the supporting flange are connected into a whole by welding, providing a strong guarantee for re-establishing the vacuum interlayer space.

[0026] 5. The longitudinal baffle, longitudinal stretching bearing frame and two longitudinal push-pull support seats of the present invention form a cross-wrapped clamping structure after assembly. After the insulation component is assembled into it, the insulation component and the longitudinal baffle connect the longitudinal stretching bearing frame and the two longitudinal push-pull support seats, and limit the relative displacement of the longitudinal stretching bearing frame and the two longitudinal push-pull support seats in the axial direction of the tank body. The main parts of the insulation component, the rear insulation pad group, the front insulation pad and the rear insulation pad are plate-type parts made of fiberglass. The plate-type parts made of fiberglass have the best compressive resistance. The cross-clamping wrapping structure of the present invention provides that under the longitudinal load condition of 2500KN of the railway, whether it is a pushing condition or a pulling condition, the fiberglass material in the insulation component only bears the pressure load, thereby further improving the structural reliability of the longitudinal support device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the assembly of the longitudinal support device, the inner head and the outer head of the present invention;

[0028] Figure 2 This is a schematic structural diagram of the longitudinal support device of the present invention;

[0029] Figure 3 is a cross-sectional view of the longitudinal support device of the present invention;

[0030] Figure 4 This is a schematic diagram of the longitudinal stretch bearing frame structure of the present invention;

[0031] Figure 5 This is a schematic structural diagram of the thermal insulation assembly of the present invention;

[0032] Figure 6 A cross-sectional view of the rear anti-shear insulation assembly of the insulation assembly of the present invention;

[0033] Figure 7 This is a schematic structural diagram of the heat insulation sleeve assembly of the present invention;

[0034] Figure 8 This is a schematic diagram of the assembly process of the support flange, longitudinal stretch bearing frame and thermal insulation assembly of the present invention;

[0035] Figure 9 This is a schematic structural diagram of the longitudinal push-pull support seat of the present invention;

[0036] Figure 10 This is a schematic structural diagram of the longitudinal push-pull support seat of the present invention;

[0037] Figure 11 This is a force and heat transfer path diagram of the longitudinal support device of the present invention under longitudinal pushing conditions;

[0038] Figure 12 This is a force and heat transfer path diagram of the longitudinal support device of the present invention under longitudinal pulling conditions.

[0039] The meaning of each number in the figure is:

[0040] 1. Inner head, 2. Outer head, 3. Supporting protective tube, 4. Supporting small head;

[0041] 10. Support flange, 20. Longitudinal tensile bearing frame, 30. Thermal insulation assembly, 40. Longitudinal push-pull support seat, 50. Longitudinal baffle, 60. Thermal insulation pad; H. Gap, J. Concentric ring gap;

[0042] 101. Support flange ear seat;

[0043] 201. front plate, 202. rear plate, 203. curved plate I, 204. curved plate II, 205. longitudinal through hole;

[0044] 301. Front insulation pad assembly, 302. Front anti-shear plate, 303. Rear insulation pad assembly, 304. Rear anti-shear plate, 305. Rear insulation pad, 306. Side insulation pad, 307. Front end insulation pad, 308. Rear end insulation pad, 309. Insulation sleeve assembly, 310. Single-head stud, 311. Insulation sleeve;

[0045] 401. U-shaped plate, 402. Support leg, 403. Reinforcement rib, 404. Support leg reinforcement rib. DETAILED DESCRIPTION

[0046] The present invention adopts a novel longitudinal support device at the inner and outer heads at one end of the liquid hydrogen tank body, which can avoid opening a mounting hole in the head of the tank body and maintain the integrity of the inner head. The longitudinal support device is located at the center of the head on one side of the tank body. When subjected to a longitudinal force of 2500KN in the second working condition of the railway, the inner and outer tank bodies are subjected to more uniform force in the axial direction. The longitudinal support device effectively reduces the heat leakage of the cryogenic tank body and improves the thermal insulation performance of the cryogenic tank body.

[0047] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0048] Example 1:

[0049] like Figures 1 to 12As shown, this embodiment provides a longitudinal support device for a large-volume railway cryogenic tank car, which connects the inner head 1 and the outer head 2 and is located at the center of the inner head 1 and the outer head 2; the longitudinal support device controls the relative movement of the inner and outer tank bodies in the axial direction of the tank body composition; the longitudinal support device has two functions: function 1, to bear the impact load condition when the inner head and the outer head at one end of the tank body composition are close to each other, and function 2, to bear the impact load condition when the inner head and the outer head at one end of the tank body composition are far from each other.

[0050] The longitudinal support device includes a support flange 10 , a longitudinal tensile bearing frame 20 , a heat insulation component 30 and a longitudinal push-pull support seat 40 .

[0051] The supporting flange 10 passes through and is fixed at the center of the outer head 2 and is coaxial with the tank body.

[0052] The longitudinal stretching bearing frame 20 includes a front plate 201, a rear plate 202, an arc plate I203 and an arc plate II204; the front plate 201 and the rear plate 202 are parallel to each other, the arc plate I203 connects the upper end of the front plate 201 and the upper end of the rear plate 202, and the arc plate II204 connects the lower end of the front plate 201 and the lower end of the rear plate 202; a longitudinal through hole 205 is provided in the center of the front plate 201; the longitudinal stretching bearing frame 20 is coaxial with the support flange 10, and the support flange 10 is sleeved on the front end of the longitudinal stretching bearing frame 20 and the two are connected.

[0053] The thermal insulation component 30 is arranged in the longitudinal stretching support frame 20, and the front end of the thermal insulation component 30 is connected to the front plate 201 and the support flange 10 through the longitudinal baffle 50, and the rear end is connected to the rear plate 202; the thermal insulation component 30 includes a front thermal insulation pad group 301 and a rear anti-shear thermal insulation component arranged front and back and parallel to each other, and an insulation sleeve component 309 vertically passing through the front thermal insulation pad group 301 and the rear anti-shear thermal insulation component; the rear anti-shear thermal insulation component includes a front anti-shear plate 302, a rear thermal insulation pad group 303, a rear anti-shear plate 304 and a rear end thermal insulation pad 305 arranged in sequence from front to back and parallel to each other; the left and right sides of the rear anti-shear thermal insulation component extend out of the longitudinal stretching support frame 20; the rear end of the thermal insulation sleeve assembly 309 is installed on the rear plate 202.

[0054] There are two groups of longitudinal pushing and pulling support seats 40 and they are symmetrically arranged on the left and right sides of the insulation assembly 30. The longitudinal pushing and pulling support seats 40 include a U-shaped plate 401 and two supporting legs 402. The two supporting legs 402 are connected to the U-shaped plate 401 and extend to the rear of the U-shaped plate; the opening of the U-shaped plate 401 faces the insulation assembly 30 and the side end of the rear anti-shear insulation assembly is located between the two side plates of the U-shaped plate 401, and a side insulation pad 306 is provided between the bottom plate of the U-shaped plate 401 and the end of the rear anti-shear insulation assembly; the rear end of the support leg 402 is connected to the inner head 1.

[0055] Two supporting flange ears 101 are provided on the inner wall of the supporting flange 10, and the two supporting flange ears 101 correspond to the front plate 201 on both sides of the longitudinal through hole 205 respectively; the supporting flange ears 101, the front plate 201 and the longitudinal baffle 50 are connected by bolts; thermal insulation pads 60 are provided between the front plate 201 and the supporting flange ears 101, and between the supporting flange ears 101 and the longitudinal baffle 50; the supporting flange, the supporting flange ears, the longitudinal baffle and the longitudinal stretching bearing frame are all made of metal materials. In order to reduce the heat conduction of the system during the assembly process, technical innovation point 1: thermal insulation pads are placed on the inner and outer sides of the supporting ears respectively, so that the longitudinal baffle and the longitudinal stretching bearing frame are separated by two thermal insulation pads, thereby reducing the heat conduction between the contact surfaces between the longitudinal baffle and the longitudinal stretching bearing frame and the supporting flange ears; technical innovation point 2: after the support flange and the longitudinal stretching bearing frame are assembled, a concentric ring gap J is retained between the support flange and the longitudinal stretching bearing frame, the purpose of which is to eliminate the contact heat conduction between the support flange and the longitudinal stretching bearing frame.

[0056] The longitudinal baffle 50 is installed on the inner side of the support flange ear seat 101, and the front plate of the longitudinal tensile bearing frame 20 is installed on the outer side of the support flange ear seat 101. Under the push-pull working condition of the railway 2500KN impact load, in order to ensure the structural reliability of the longitudinal support device, the technical innovation is as follows: the support flange is installed at the center of the outer head. The support flange is the main bearing unit of the longitudinal impact load. Considering the rationality of the force of the entire longitudinal support device system, in order to reduce the longitudinal impact load borne by the 6 studs and 6 nuts, thereby maximizing the reliability of the studs and nuts; the longitudinal baffle is installed on the inner side (rear side) of the support flange ear seat, and the longitudinal tensile bearing frame is installed on the outer side (front side) of the support flange ear seat. Under the longitudinal impact push working condition, the longitudinal baffle pushes the support flange ear seat outward; under the longitudinal pulling working condition, the longitudinal tensile bearing frame presses the support flange ear seat inward.

[0057] The arc openings of the arc plate I203 and the arc plate II204 of the longitudinal stretching support frame 20 are opposite and symmetrically distributed up and down; the distance between the arc plate I203 and the arc plate II204 is greater than the height of the thermal insulation component 30, so that the thermal insulation component 30 can be placed in the longitudinal stretching support frame 20 and the left and right sides of the rear anti-shear insulation component extend out of the longitudinal stretching support frame 20; the edge of the front plate 201 is circular, the upper and lower edges of the rear plate 202 are arc-shaped, the left and right edges of the rear plate 202 are vertical lines, and the left and right widths of the rear plate 202 are equal to the left and right widths of the arc plate I203.

[0058] Specifically, the longitudinal sliding bearing frame is the core component of the longitudinal support device. The front plates on both sides of the longitudinal through hole are connected to the support flange ears through 6 pairs of double-headed studs and nuts, thereby fixing the relative position of the longitudinal sliding bearing frame and the outer head. After the assembly of the insulation component and the longitudinal baffle is completed, the insulation component and the longitudinal baffle will connect the longitudinal sliding bearing frame and the two longitudinal sliding support seats, thereby realizing the function of the longitudinal sliding bearing frame to connect the outer head and the inner head in the longitudinal support device. The technical innovation is: the special structural form of the longitudinal sliding bearing frame realizes the function of the longitudinal sliding bearing frame to connect the longitudinal sliding bearing frame and the two longitudinal pushing support seats under the joint cooperation of the longitudinal baffle and the insulation component, thereby realizing the connection between the outer head and the inner head.

[0059] The front insulation pad group 301 of the insulation assembly 30 is a plurality of front insulation pads stacked parallel to each other; the rear insulation pad group 303 is a plurality of rear insulation pads stacked parallel to each other, and the width of the rear insulation pad is greater than the width of the front insulation pad; the front anti-shear plate 302, the rear insulation pad and the rear anti-shear plate 304 have the same shape; front end insulation pads 307 are provided at the left and right ends of the front wall of the front anti-shear plate 302, and the front end insulation pad 307 is located between the side plate of the U-shaped plate 401 and the front anti-shear plate 302; rear end insulation pads 308 are provided at the left and right ends of the rear wall of the rear anti-shear plate 304, and the rear end insulation pad 308 is located between the side plate of the U-shaped plate 401 and the rear anti-shear plate 304.

[0060] The front insulation pad group 301, the rear insulation pad group 303, the front end insulation pad 307 and the rear end insulation pad 308 are all made of fiberglass, and the front anti-shear plate 302 and the rear anti-shear plate 304 are made of stainless steel. The front end insulation pad 307 is fixed to the front anti-shear plate 302 by bolts, and the rear end insulation pad 308 is fixed to the rear anti-shear plate 304 by bolts. Specifically, the fiberglass and stainless steel hybrid structure composed of the front end insulation pad and the front anti-shear plate, and the fiberglass and stainless steel hybrid structure composed of the rear end insulation pad and the rear anti-shear plate, serve the following functions: to enhance the ability of the low-temperature tank body to withstand the 2500KN impact load of the second railway working condition, thereby preventing the impact load from causing shear damage to the fiberglass parts in the insulation assembly, namely the rear insulation pad group; specifically, the use of stainless steel plates, namely the front anti-shear plate and the rear anti-shear plate, can enhance the shear damage resistance of the rear insulation pad group in the insulation assembly.

[0061] Specifically, the front insulation pad group and the rear anti-shear insulation assembly parts of the insulation assembly are assembled in a piece-by-piece and step-by-step manner, wherein the longitudinal baffle, the front insulation pad group and the rear anti-shear insulation assembly are first placed in a vertical state and aligned parallel to the longitudinal through-hole on the front plate, and then pushed into the longitudinal stretching bearing frame through the longitudinal through-hole in sequence according to the assembly order. After reaching the designated position, the insulation assembly parts are rotated 90° to a horizontal state and fit tightly with the adjacent parts.

[0062] The detailed assembly process of the thermal insulation components is as follows (e.g. Figure 8 (a) to (g) of Figure 8 (a) Assemble the front end of the longitudinal tensile bearing frame, which has been assembled with two single-end studs (installed on the rear plate), into the support flange, then fit two thermal insulation sleeves onto the two single-end studs, and then fit the rear end thermal insulation pad onto the outside of the two thermal insulation sleeves and make it close to the inner wall of the rear plate; Figure 8 (b) Install the rear anti-shear plate and part of the rear thermal insulation pad onto the thermal insulation sleeve assembly in sequence; Figure 8 (c) Put two heat-insulating sleeves on two single-head studs; Figure 8 (d) Then, install the remaining rear insulation pad, the front anti-shear plate and the first front insulation pad of the front insulation pad group on the outside of the insulation sleeve assembly in sequence; at this time, assemble and position the two insulation sleeves at the step formed by the insulation sleeve assembly and the first front insulation pad as shown in the figure. Figure 8 (e) Then, place the remaining three front insulation pads on the outside of the two insulation sleeves and attach them tightly to the outer side of the first front insulation pad. Figure 8 (f); if Figure 8 (g) Assemble the longitudinal baffle on the outside (front) of the front insulation pad group, insert the non-threaded parts of the two single-head studs into the two insulation sleeves, and assemble the two insulation pads on both sides of the outside of the longitudinal baffle (i.e., the front wall). Then, assemble the support flange, insulation pad, longitudinal baffle and longitudinal tensile bearing frame together using 6 pairs of double-headed studs and nuts to complete the assembly of the support flange, longitudinal tensile bearing frame and insulation assembly.

[0063] The thermal insulation sleeve assembly 309 includes a single-head stud 310 and an external thermal insulation sleeve 311. Specifically, each single-head stud 310 is provided with three sections of thermal insulation sleeves 311 arranged axially in sequence; the thermal insulation sleeve assembly 309 has four groups, namely, a coaxial upper front thermal insulation sleeve assembly and an upper rear thermal insulation sleeve assembly, and a coaxial lower front thermal insulation sleeve assembly and a lower rear thermal insulation sleeve assembly; the rear end of the single-head stud 310 in the upper front thermal insulation sleeve assembly does not contact the front end of the single-head stud 310 in the upper rear thermal insulation sleeve assembly to prevent heat conduction; the rear end of the single-head stud 310 in the lower front thermal insulation sleeve assembly does not contact the front end of the single-head stud 310 in the lower rear thermal insulation sleeve assembly to prevent heat conduction.

[0064] Specifically, the heat insulation component is a hybrid structure composed of fiberglass parts and stainless steel parts. When considering the strength of the heat insulation component, the heat insulation performance of the heat insulation component must also be considered. The single-head stud is equipped with three heat insulation sleeves on the outside. Its main function is to separate the four single-head studs from the front anti-shear plate and the rear anti-shear plate (the single-head studs and the front anti-shear plate and the rear anti-shear plate are all made of stainless steel) through the heat insulation sleeve to achieve the purpose of heat insulation; at the same time, Figure 6As shown, after the four single-head studs are assembled, the tail ends of the four single-head studs are kept at a certain distance from each other to prevent heat conduction.

[0065] Reinforcing ribs 403 are provided at the junction of the side panels and the bottom panel of the U-shaped plate 401 of the longitudinal push-pull support seat 40; and supporting leg reinforcing ribs 404 are provided on the supporting legs 402. In order to enhance the strength and rigidity of the supporting legs in the longitudinal push-pull support seat, and at the same time to minimize the cross-sectional area of ​​the components at the transition connection between the U-shaped plate and the supporting legs, after comprehensive consideration of several options, it was chosen to add a structural form such as supporting leg reinforcing ribs. The characteristics of such reinforcing ribs are: while ensuring the minimum increase in the cross-sectional area at the transition connection (the purpose is to reduce the heat transferred from the bottom panel of the U-shaped plate to the supporting leg position), the strength and rigidity of the supporting legs are enhanced; at the same time, two reinforcing ribs are added to the outside of the front side panel of the U-shaped plate and a reinforcing rib is added to the outside of the rear side panel of the U-shaped plate, the purpose of which is to increase the strength and rigidity of the front side panel of the U-shaped plate and the supporting legs.

[0066] The outer end of the support flange 10 is sealed with one end of the support protective tube 3, and the other end of the support protective tube 3 is welded with a small support head 4, and the support protective tube 3 and the small support head 4 are located outside the outer head 2; the small support head 4, the support protective tube 3, the support flange 10 and the outer head 2 are sealed and connected in sequence to close the interlayer space between the outer tank body and the inner tank body. The function of the support protective tube: to facilitate the regular maintenance of the longitudinal support device of the low-temperature liquid railway tank car during the design service life cycle, after the weld connecting the small support head and the support protective tube is destroyed, the longitudinal support device inside the small support head is repaired and repaired. After the maintenance work is completed, the outer end surface of the support protective tube is polished and smoothed, and then the small support head and the support protective tube are welded together, so that the small support head, the support protective tube, the longitudinal support device and the outer head together form a closed outer tank body, wherein the design length of the support protective tube is calculated according to formula (1):

[0067]

[0068] W-design length of support tube (mm);

[0069] T- maintenance cycle of longitudinal support device (year);

[0070] K-the amount of cutting consumption of the support tube required for maintenance (mm);

[0071] Q-design service life of cryogenic tank truck (years);

[0072] F-Reserved length of support tube design (mm).

[0073] The supporting flange 10 , the longitudinal baffle 50 , the longitudinal tensile bearing frame 20 and the two longitudinal push-pull support seats 40 form a cross-clamping wrapping structure to wrap the thermal insulation assembly 30 therein.

[0074] Specifically, the thermal insulation component is placed therein, and is limited by the cross-clamping wrapping structure both horizontally and vertically. The various parts inside the thermal insulation component are assembled by installing them step by step in pieces. The relationship between the various parts is a loose fit, and this loose fit relationship is wrapped by the cross-clamping wrapping structure to form a whole. The longitudinal tensile bearing frame is installed on the supporting flange ear seat in the supporting flange, the supporting flange is installed on the outer head, the longitudinal baffle is installed on the supporting flange ear seat of the supporting flange, and the two longitudinal push-pull support seats are installed on the inner head; the supporting flange, the longitudinal baffle, and the longitudinal tensile bearing frame are relatively stationary under the operating conditions of the low-temperature tank truck, while the two longitudinal push-pull support seats and the inner tank body will produce relative movement relative to the outer tank body under the action of the inertial force generated by the weight of the inner tank body and the weight of the medium carried, among which the thermal insulation component plays a role in limiting the relative movement between the supporting flange, the longitudinal baffle, the longitudinal tensile bearing frame and the two longitudinal push-pull support seats; in the transverse direction of the tank body, the single-head studs, the supporting flange ear seat of the supporting flange, the longitudinal baffle, the longitudinal tensile bearing frame, the two longitudinal push-pull support seats and the thermal insulation component are used to constrain the relative displacement of the two longitudinal tensile bearing frames and the supporting flange, thereby constraining the relative displacement of the outer head and the inner head in the transverse direction.

[0075] There are gaps between the front side plate of the U-shaped plate 401 and the front end heat insulation pad 307 , and between the rear side plate of the U-shaped plate 401 and the rear end heat insulation pad 308 .

[0076] Specifically, the longitudinal impact push condition (i.e. the inner and outer tank bodies are close to each other at the longitudinal support connection end, such as Figure 11 (As shown in the direction of the arrow in the figure), under the action of the longitudinal impact thrust, the side plate of the U-shaped plate transfers the thrust to the rear end insulation pad, and the rear end insulation pad transfers the thrust to the entire insulation assembly. Finally, the longitudinal impact force is transmitted from the front insulation pad to the longitudinal baffle. The key points of the entire force and heat transfer path are: 1. The rear end insulation pad and the rear end insulation pad are disconnected, which effectively reduces the heat conduction cross-sectional area at the variable cross-section of the insulation assembly and effectively reduces the heat leakage of the system; 2. The stainless steel support seat (longitudinal push-pull support seat) and the stainless steel front and rear anti-shear plates in the insulation assembly are separated by the side insulation pads, which cuts off the heat transfer, thereby ensuring the low temperature performance of the tank.

[0077] Specifically, a gap H is always maintained between the outer plate (i.e., the front side plate) of the U-shaped plate and the front end thermal insulation pad during the longitudinal force transmission process. The gap H is calculated according to formula (2). The gap H cuts off the path of heat transfer from the thermal insulation component to the outer plate of the U-shaped plate; Figure 12, longitudinal impact pulling condition (i.e. the inner and outer tank bodies are separated from each other at the connection end of the longitudinal support device, such as Figure 12 (as shown by the arrow in the figure), under the action of the longitudinal impact tension, the outer plate of the U-shaped plate transfers the tension to the front end insulation pad, and the front end insulation pad transfers the force to the entire insulation assembly. Finally, the longitudinal impact force is transferred to the longitudinal tensile bearing frame by the rear end insulation pad. The key points of the entire force and heat transfer path are the same as those in the longitudinal impact push condition. The gap between the inner plate of the U-shaped plate (i.e., the rear side plate) and the rear end insulation pad is also H:

[0078] H≤L×α-L×M% (2)

[0079] in,

[0080] L is the equivalent length of the large-diameter pipe in the sandwich pipe in the axial direction of the tank;

[0081] M is the shrinkage rate of the sandwich pipe material at -253°C;

[0082] α is the anti-destruction safety factor of the sandwich pipe under thermal expansion and contraction conditions and the weld connecting the sandwich pipe and the pipe edge, α1≤α≤α2, α1 and α2 are the minimum and maximum values ​​of the anti-destruction safety factor of the weld connecting the sandwich pipe and the pipe edge, respectively.

[0083] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0084] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0085] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A longitudinal support device for a large-capacity railway cryogenic tank car, characterized in that: The longitudinal support device connects the inner head (1) and the outer head (2) and is located at the center of the inner head (1) and the outer head (2); the longitudinal support device comprises a support flange (10), a longitudinal tensile bearing frame (20), a heat insulation component (30) and a longitudinal push-pull support seat (40); The supporting flange (10) passes through and is fixed at the center of the outer head (2) and is coaxial with the tank body; The longitudinal stretching bearing frame (20) comprises a front plate (201), a rear plate (202), an arc plate I (203) and an arc plate II (204); the front plate (201) and the rear plate (202) are parallel to each other, the arc plate I (203) connects the upper end of the front plate (201) and the upper end of the rear plate (202), and the arc plate II (204) connects the lower end of the front plate (201) and the lower end of the rear plate (202); a longitudinal through hole (205) is provided in the center of the front plate (201); the longitudinal stretching bearing frame (20) is coaxial with the support flange (10), and the support flange (10) is sleeved on the front end of the longitudinal stretching bearing frame (20) and the two are connected; The heat insulation component (30) is arranged in the longitudinal stretch bearing frame (20), the front end of the heat insulation component (30) is connected to the front plate (201) and the support flange (10) through the longitudinal baffle (50), and the rear end is connected to the rear plate (202); the heat insulation component (30) includes a front heat insulation pad group (301) and a rear anti-shear heat insulation component arranged in front and back and parallel to each other, and a heat insulation sleeve component (309) vertically penetrating the front heat insulation pad group (301) and the rear anti-shear heat insulation component; the rear anti-shear heat insulation component includes a front anti-shear plate (302), a rear heat insulation pad group (303), a rear anti-shear plate (304) and a rear end heat insulation pad (305) arranged in sequence from front to back and parallel to each other; the left and right sides of the rear anti-shear heat insulation component extend out of the longitudinal stretch bearing frame (20); the rear end of the heat insulation sleeve component (309) is mounted on the rear plate (202); The longitudinal push-pull support seat (40) has two groups and is symmetrically arranged on the left and right sides of the insulation assembly (30). The longitudinal push-pull support seat (40) includes a U-shaped plate (401) and two support legs (402). The two support legs (402) are connected to the U-shaped plate (401) and extend to the rear of the U-shaped plate; the opening of the U-shaped plate (401) faces the insulation assembly (30) and the side end of the rear anti-shear insulation assembly is located between the two side plates of the U-shaped plate (401); a side insulation pad (306) is provided between the bottom plate of the U-shaped plate (401) and the end of the rear anti-shear insulation assembly; the rear end of the support leg (402) is connected to the inner head (1); The supporting flange (10), the longitudinal baffle (50), the longitudinal stretching bearing frame (20) and the two longitudinal push-pull supporting seats (40) form a cross-clamping and wrapping structure.

2. The longitudinal support device for a large-capacity railway cryogenic tank car according to claim 1, characterized in that: Two supporting flange ear seats (101) are provided on the inner wall of the supporting flange (10), and the two supporting flange ear seats (101) respectively correspond to the front plates (201) on both sides of the longitudinal through hole (205); the supporting flange ear seats (101), the front plate (201) and the longitudinal baffle (50) are connected by bolts; a heat insulation pad (60) is provided between the front plate (201) and the supporting flange ear seat (101) and between the supporting flange ear seat (101) and the longitudinal baffle (50); the longitudinal baffle (50) is installed on the inner side of the supporting flange ear seat (101), and the front plate (201) of the longitudinal tensile bearing frame (20) is installed on the outer side of the supporting flange ear seat (101).

3. The longitudinal support device for a large-capacity railway cryogenic tank car according to claim 1, characterized in that: The arc openings of the arc plate I (203) and the arc plate II (204) of the longitudinal stretching bearing frame (20) are opposite and symmetrically distributed up and down; the distance between the arc plate I (203) and the arc plate II (204) is greater than the height of the heat insulation component (30), so that the heat insulation component (30) can be placed in the longitudinal stretching bearing frame (20) and the left and right sides of the rear anti-shear heat insulation component extend out of the longitudinal stretching bearing frame (20); the edge of the front plate (201) is circular, the upper and lower edges of the rear plate (202) are arc-shaped, the left and right edges of the rear plate (202) are vertical straight lines, and the left and right widths of the rear plate (202) are equal to the left and right widths of the arc plate I (203).

4. The longitudinal support device for a large-capacity railway cryogenic tank car according to claim 1, characterized in that: The front thermal insulation pad group (301) of the thermal insulation assembly (30) is a plurality of front thermal insulation pads stacked in parallel with each other; the rear thermal insulation pad group (303) is a plurality of rear thermal insulation pads stacked in parallel with each other, and the width of the rear thermal insulation pads is greater than the width of the front thermal insulation pads; the front anti-shear plate (302), the rear thermal insulation pad and the rear anti-shear plate (304) have the same shape; front end thermal insulation pads (307) are provided at the left and right ends of the front wall of the front anti-shear plate (302), and the front end thermal insulation pads (307) are located between the side plates of the U-shaped plate (401) and the front anti-shear plate (302); and rear end thermal insulation pads (308) are provided at the left and right ends of the rear wall of the rear anti-shear plate (304), and the rear end thermal insulation pads (308) are located between the side plates of the U-shaped plate (401) and the rear anti-shear plate (304).

5. The longitudinal support device for a large-capacity railway cryogenic tank car according to claim 4, characterized in that: The front thermal insulation pad group (301), the rear thermal insulation pad group (303), the front end thermal insulation pad (307) and the rear end thermal insulation pad (308) are all made of glass fiber reinforced plastics, and the front anti-shear plate (302) and the rear anti-shear plate (304) are made of stainless steel; the front end thermal insulation pad (307) and the front anti-shear plate (302) are fixed by bolts, and the rear end thermal insulation pad (308) and the rear anti-shear plate (304) are fixed by bolts.

6. The longitudinal support device for a large-capacity railway cryogenic tank car according to claim 1, characterized in that: The thermal insulation sleeve assembly (309) includes a single-head stud and an external thermal insulation sleeve (311); the thermal insulation sleeve assembly (309) has four groups, namely a coaxial upper front thermal insulation sleeve assembly and an upper rear thermal insulation sleeve assembly, and a coaxial lower front thermal insulation sleeve assembly and a lower rear thermal insulation sleeve assembly; the rear end of the single-head stud in the upper front thermal insulation sleeve assembly does not contact the front end of the single-head stud in the upper rear thermal insulation sleeve assembly; the rear end of the single-head stud in the lower front thermal insulation sleeve assembly does not contact the front end of the single-head stud in the lower rear thermal insulation sleeve assembly.

7. The longitudinal support device for a large-capacity railway cryogenic tank car according to claim 1, characterized in that: A reinforcing rib (403) is provided at the junction of the side plate and the bottom plate of the U-shaped plate (401) of the longitudinal push-pull support seat (40); and a supporting leg reinforcing rib (404) is provided on the supporting leg (402).

8. The longitudinal support device for a large-capacity railway cryogenic tank car according to claim 1, characterized in that: The outer end of the support flange (10) is sealedly connected to one end of the support protective tube (3), and the other end of the support protective tube (3) is welded to a small support head (4), and the support protective tube (3) and the small support head (4) are located outside the outer head (2); the small support head (4), the support protective tube (3), the support flange (10) and the outer head (2) are sealedly connected in sequence to seal the interlayer space between the outer tank body and the inner tank body.

9. The longitudinal support device for a large-capacity railway cryogenic tank car according to claim 4, characterized in that: Gaps are left between the front side plate of the U-shaped plate (401) and the front end heat insulation pad (307), and between the rear side plate of the U-shaped plate (401) and the rear end heat insulation pad (308).

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