Low-temperature surge tank adaptive to pressure alternating load

Abstract

The invention provides a low-temperature surge tank adapting to pressure alternating load, and relates to the technical field of cryogenic pressure containers. The inner tank is arranged in the outer tank, vacuum is formed between the outer tank and the inner tank, a filling pipeline and a transfer filling pipeline penetrate through the outer tank to be communicated with the inner tank, a plurality of second supporting assemblies are arranged between the outer tank and the inner tank, and each second supporting assembly comprises an outer supporting seat arranged on the inner wall of the outer tank and an inner supporting seat arranged on the outer wall of the inner tank; and a supporting rod is connected between the outer supporting seat and the inner supporting seat. The device is used for storing low-temperature fluid with low-temperature and pressure alternating working conditions, adapts to pressure fatigue loads and is high in safety.

Description

Technical Field

[0001] The invention relates to the technical field of cryogenic pressure vessels, and in particular to a low-temperature pressure-stabilizing tank adaptable to pressure alternating loads. Background Art

[0002] Cryogenic storage tanks are equipment used to store refrigerated liquefied gases (such as liquid oxygen, liquid nitrogen, liquid argon, etc.), and their operating temperature is usually around -196°C. Vertical cryogenic storage tanks have the advantages of large storage capacity, small footprint, and high safety, and are widely used in aerospace, scientific research, medical, food, chemical and other fields.

[0003] In the prior art, traditional cryogenic storage containers are mainly used to store cryogenic fluids under constant pressure. Their structures can only withstand constant pressure loads. When storing cryogenic fluids under alternating pressure conditions, the safety of the containers becomes unstable under the application of fatigue loads, affecting the normal operation of the equipment. Leakage of cryogenic liquid storage tanks can lead to serious safety accidents. Summary of the invention

[0004] The purpose of the present invention is to develop a low-temperature pressure-stabilizing tank that is adaptable to pressure alternating loads and is used to store low-temperature fluids under low-temperature and pressure alternating conditions, which can adapt to pressure fatigue loads and improve the safety and stability of cryogenic equipment.

[0005] The present invention is achieved through the following technical solutions: A low temperature pressure stabilizing tank adapted to pressure alternating loads, comprising: outer tank; The inner tank is placed inside the outer tank, and there is a vacuum between the outer tank and the inner tank; The filling pipeline and the transfer pipeline pass through the outer tank and are connected with the inner tank; A plurality of second support assemblies are disposed between the outer tank and the inner tank; Wherein, the second support assembly includes an outer support seat arranged on the inner wall of the outer tank and an inner support seat arranged on the outer wall of the inner tank, and a support rod is connected between the outer support seat and the inner support seat.

[0006] Optionally, the outer support seat is located above the inner support seat, and the outer support seat and the inner support seat are in the same radial direction of the inner tank.

[0007] Optionally, a plurality of the second support assemblies are arranged at equal intervals in the circumferential direction of the inner tank, and a plurality of the inner support seats are all located on the same circumferential trajectory of the outer wall of the inner tank.

[0008] Optionally, a lower support seat is provided at the inner bottom of the outer tank, and the lower support seat is in contact with the bottom of the inner tank.

[0009] Optionally, an upper support seat is provided at the inner top of the outer tank, and the upper support seat is in contact with the top of the inner tank.

[0010] Optionally, a reinforcement assembly is provided on the inner wall of the outer tank, and the reinforcement assembly includes at least one annular reinforcement member provided on the inner wall of the outer tank.

[0011] Optionally, the position of the reinforcement component on the inner wall of the outer tank corresponds to an outer support seat, and the outer support seat is fixedly connected to the reinforcement member.

[0012] Optionally, the filling pipeline enters from the bottom of the outer tank and is connected to the top of the inner tank, and the filling pipeline has a compensation section located above the top of the inner tank, and the filling pipeline on the compensation section is bent at least twice in succession.

[0013] Optionally, the transfer pipeline enters from the bottom of the outer tank and is connected with the bottom of the inner tank, the transfer pipeline has a liquid-sealed section, the liquid-sealed section is located between the inner tank and the outer tank, the transfer pipeline on the liquid-sealed section is bent multiple times, and there is a pipe section on the liquid-sealed section that is higher than the point where the transfer pipeline is connected with the inner tank.

[0014] Optionally, outer walls of the inner tank, the filling pipeline and the transfer pipeline are all provided with an insulation layer, and the insulation layer includes at least one layer of spacer material and at least one layer of reflective screen.

[0015] The beneficial effects of the present invention are: The present invention is a high-vacuum multi-layer insulated vertical cryogenic storage tank, which is used to store cryogenic fluids at a low temperature of -196°C and under pressure alternating working conditions, has low heat leakage, is adaptable to pressure fatigue loads and has high safety; The first support assembly and the second support assembly between the inner tank and the outer tank are made of materials with sufficient strength and low thermal conductivity to bear the loads under working conditions and transportation conditions. The first support assembly is made of non-metallic material, which can bear the inertial load during equipment transportation and reduce the heat leakage introduced into the inner tank from the outside. The second support assembly is made of metal material, which mainly bears the load on the inner tank under working conditions, and increases the heat conduction path to reduce heat leakage while meeting the strength requirements. The two sets of support assemblies do not affect the safety of low-temperature shrinkage of the inner tank; The at least one insulating layer provided greatly reduces the radiation heat transfer in the high vacuum cavity from the outer tank to the inner tank, reduces the heat leakage, reduces the evaporation loss of the cryogenic liquid, and has the advantages of high insulation efficiency and light weight; The compensation section and liquid seal section installed on the filling pipeline and transfer pipeline compensate for pipeline deformation, reduce the stress and deformation inside the pipeline, reduce the risk of pipeline damage under pressure alternating conditions, and improve the service life and safety of the pipeline. The liquid seal section prevents local frost on the external pipeline after the internal pipeline passes through the outer tank, which affects the safety of the outer tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 This is a top view of the inner tank.

[0018] Figure numerals: 1. inner tank; 2. outer tank; 3. insulation layer; 4. upper support seat; 5. outer support seat; 6. support rod; 7. inner support seat; 8. transfer pipeline; 81. liquid sealing section; 9. support leg; 10. lower support seat; 11. filling pipeline; 111. compensation section; 12. reinforcement. DETAILED DESCRIPTION

[0019] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0022] In the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0023] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0024] like Figure 1 and Figure 2 As shown, the present invention discloses a low-temperature stabilizing tank adapted to pressure alternating loads, including an outer tank 2, a plurality of legs 9 are provided at the bottom of the outer tank 2, an inner tank 1 is provided inside the outer tank 2, and a vacuum is formed between the outer tank 2 and the inner tank 1. The outer tank 2 and the inner tank 1 both adopt a head plus cylinder structure, the inner tank 1 and the outer tank 2 are in a coaxial state, the inner tank 1 is used to contain a low-temperature fluid at -196°C, and a small head convex upward is provided at the center of the top head of the inner tank 1 to improve the structural strength of the inner tank 1 and improve the overall safety of the inner tank 1 under pressure alternating working conditions. The outer tank 2 is a high vacuum protective shell, and at least one insulating layer 3 is provided between the outer tank 2 and the inner tank 1 to reduce the heat transmitted from the outside to the inner tank 1 and reduce the evaporation of the low-temperature fluid in the inner tank 1.

[0025] A first support assembly and a second support assembly are provided between the inner tank 1 and the outer tank 2. The first support assembly is mainly used to bear the inertial load of the equipment during transportation and reduce the heat leakage introduced into the inner tank 1 from the outside. The second support assembly is mainly used to bear the load on the inner tank 1 under working conditions and reduce the heat leakage introduced into the inner tank 1 from the outside by increasing the heat conduction path. Neither the first support assembly nor the second support assembly affects the low-temperature contraction of the inner tank 1 under pressure alternating conditions.

[0026] The first support assembly includes a lower support seat 10 disposed at the center of the inner bottom of the outer tank 2 and an upper support seat 4 disposed at the center of the inner top. The lower support seat 10 and the upper support seat 4 are in contact with the center of the bottom and the center of the top of the inner tank 1, respectively, to support and fix the inner tank 1. The lower support seat 10 and the upper support seat 4 are both made of non-metallic materials to reduce the heat leakage from the outside into the inner tank 1 through the upper support seat 4 and the lower support seat 10. Metal guide fixing rings are set at both ends of the lower support seat 10 and the upper support seat 4, and the fixing rings are connected to the heads of the inner tank 1 and the outer tank 2.

[0027] The second support assembly includes an outer support seat 5 arranged on the inner wall of the outer tank 2 and an inner support seat 7 arranged on the outer wall of the inner tank 1. The outer support seat 5 is above the inner support seat 7. A support rod 6 is connected between the outer support seat 5 and the inner support seat 7. The outer support seat 5 and the inner support seat 7 are in the same radial direction of the inner tank 1, that is, the projection of the support rod 6 on the horizontal plane is in the radial direction of the inner tank 1.

[0028] The inner support seat 7, the outer support seat 5 and the support rod 6 are all made of metal materials, ensuring sufficient structural strength to firmly support and fix the inner tank 1. The support rod 6 has a certain length, which achieves the purpose of reducing heat leakage by increasing the heat conduction path.

[0029] There are multiple second support assemblies, which are arranged at equal intervals in the circumferential direction of the inner tank 1, and the multiple inner support seats 7 are all located on the same circumferential track of the outer wall of the inner tank 1. In this embodiment, three sets of second support assemblies are arranged between the inner tank 1 and the outer tank 2.

[0030] A reinforcement assembly is provided on the inner wall of the outer tank 2, which enhances the structural strength of the outer tank 2 and the outer support 5. The reinforcement assembly includes two annular reinforcement members 12 provided on the inner wall of the outer tank 2, the positions of the two reinforcement members 12 correspond to the outer support 5, and the outer support 5 is fixedly connected to the two reinforcement members 12.

[0031] The top end cap of the inner tank 1 is connected with a filling pipeline 11, which extends downward between the inner tank 1 and the outer tank 2 until it extends out of the bottom end cap of the outer tank 2. The filling pipeline 11 has a compensation section 111, which is located above the top end cap of the inner tank 1. The filling pipeline 11 on the compensation section 111 is U-shaped, and is bent twice in succession.

[0032] The bottom end cap of the inner tank 1 is connected with a transfer pipeline 8, which passes between the outer tank 2 and the inner tank 1 and extends from the bottom end cap of the outer tank 2. The transfer pipeline 8 has a liquid seal section 81, which is located between the inner tank 1 and the outer tank 2. The transfer pipeline 8 on the liquid seal section 81 is bent several times, and there is a pipe section on the liquid seal section 81 that is higher than the connection point between the transfer pipeline 8 and the inner tank 1, so that fluid always stays in the liquid seal section 81.

[0033] The inner tank 1 can simultaneously adapt to the low-temperature fluid loading and unloading cycle pressure of 0.1 to 1.0 MPa and the pressure load cycle number of 110,000 times. The filling pipeline 11 and transfer pipeline 8 connected to the inner tank 1 also have the ability to withstand the pressure cycle load.

[0034] The outer wall of the inner tank 1, the outer wall of the filling pipeline 11 and the outer wall of the transfer pipeline 8 are all provided with at least one insulating layer 3, and the insulating layer 3 includes a spacer material and a reflective screen from the inside to the outside, and the spacer material is in contact with the corresponding outer wall of the inner tank 1, the outer wall of the filling pipeline 11 or the outer wall of the transfer pipeline 8. The reflective screen is aluminum foil or aluminum-plated polyester film, and the spacer material is one or more combinations of glass fiber paper, glass fiber cloth, chemical fiber paper, and synthetic fiber screen.

[0035] The above embodiments are only preferred embodiments of the present invention and are not limitations of the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. A low temperature pressure regulating tank adapted to pressure alternating load, characterized in that: include: outer tank; The inner tank is placed inside the outer tank, and there is a vacuum between the outer tank and the inner tank; The filling pipeline and the transfer pipeline pass through the outer tank and are connected with the inner tank; A plurality of second support assemblies are disposed between the outer tank and the inner tank; Wherein, the second support assembly includes an outer support seat arranged on the inner wall of the outer tank and an inner support seat arranged on the outer wall of the inner tank, and a support rod is connected between the outer support seat and the inner support seat.

2. The low-temperature pressure-stabilizing tank adapted to pressure alternating loads according to claim 1, characterized in that: The outer support seat is located above the inner support seat, and the outer support seat and the inner support seat are located in the same radial direction of the inner tank.

3. The low-temperature pressure-stabilizing tank adapted to pressure alternating loads according to claim 1, characterized in that: The plurality of the second support assemblies are arranged at equal intervals in the circumferential direction of the inner tank, and the plurality of the inner support seats are all located on the same circumferential trajectory of the outer wall of the inner tank.

4. The low-temperature pressure-stabilizing tank adapted to pressure alternating loads according to claim 1, characterized in that: A lower support seat is provided at the inner bottom of the outer tank, and the lower support seat is in contact with the bottom of the inner tank.

5. The low-temperature pressure-stabilizing tank adapted to pressure alternating loads according to claim 1, characterized in that: An upper support seat is provided at the inner top of the outer tank, and the upper support seat is in contact with the top of the inner tank.

6. The low-temperature pressure-stabilizing tank adapted to pressure alternating loads according to claim 1, characterized in that: A reinforcement component is arranged on the inner wall of the outer tank, and the reinforcement component comprises at least one annular reinforcement member arranged on the inner wall of the outer tank.

7. The low-temperature pressure-stabilizing tank adapted to pressure alternating loads according to claim 6, characterized in that: The position of the reinforcement component on the inner wall of the outer tank corresponds to the outer support seat, and the outer support seat is fixedly connected to the reinforcement member.

8. The low-temperature pressure-stabilizing tank adapted to pressure alternating loads according to claim 1, characterized in that: The filling pipeline enters from the bottom of the outer tank and communicates with the top of the inner tank. The filling pipeline has a compensation section located above the top of the inner tank. The filling pipeline on the compensation section is bent continuously for at least two times.

9. The low-temperature pressure-stabilizing tank adapted to pressure alternating loads according to claim 1, characterized in that: The transfer pipeline enters from the bottom of the outer tank and is connected with the bottom of the inner tank. The transfer pipeline has a liquid-sealed section, which is located between the inner tank and the outer tank. The transfer pipeline on the liquid-sealed section is bent multiple times, and there is a pipe section on the liquid-sealed section that is higher than the point where the transfer pipeline is connected with the inner tank.

10. The low-temperature pressure-stabilizing tank adapted to pressure alternating loads according to any one of claims 1 to 9, characterized in that: The outer walls of the inner tank, the filling pipeline and the transfer pipeline are all provided with a heat-insulating layer, and the heat-insulating layer includes at least one layer of spacer material and at least one layer of reflective screen.

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