Integral heat insulation structure for low-temperature expansion machine

Abstract

The utility model discloses an integral heat insulation structure for a low-temperature expansion machine, and belongs to the technical field of expansion machine equipment. Comprising a volute with an air inlet and an air outlet, a flange is connected to the expansion end of the volute, a low-temperature heat insulation buffer plate is further arranged between the expansion end of the volute and the end face of the inner side of the flange, and the low-temperature heat insulation buffer plate is an epoxy glass steel plate. The utility model has the advantages that the cooling capacity loss caused by material conduction can be effectively reduced, and the icing probability and thickness of the external flange are greatly reduced.

Description

Technical Field

[0001] This utility model belongs to the technical field of expander equipment, specifically relating to an integral heat insulation structure for a cryogenic expander. Background Technology

[0002] An expander is a machine that utilizes the principle that compressing gas expands and reduces pressure, thus outputting mechanical work and lowering the gas temperature to obtain cooling. This equipment is commonly used in cryogenic equipment. See [link to relevant documentation]. Figure 1 The cryogenic expander includes a volute 1 and a flange 2 connected to the expansion end of the volute 1. In this structure, the expansion end of the volute 1 is in direct contact with one end face of the flange 2. Since it is used in a cryogenic environment, the flange 2, which is in contact with the outside environment, often freezes due to the large temperature difference. Furthermore, the flange 2 needs to withstand a certain degree of pressure. Generally, the design consideration is that the flange 2 needs to be able to withstand high pressure and low temperature environments, so it is made of stainless steel. However, stainless steel does have relatively good heat transfer properties, and the cryogenic medium inside the expansion end of the volute 1 can easily be conducted to the outside. This can result in energy loss due to heat transfer through the material, or even lead to excessively thick ice layers that affect the operation of external actuators. In view of the above-mentioned existing technology, the applicant has made a beneficial design, and the technical solution described below is developed under this background. Utility Model Content

[0003] The purpose of this invention is to provide an integral insulation structure for a cryogenic expander, which can effectively reduce the loss of cold energy caused by material conduction and greatly reduce the probability and thickness of icing on the external flange.

[0004] The purpose of this utility model is to provide an integral heat insulation structure for a cryogenic expander, comprising a volute with an air inlet and an air outlet, wherein a flange is connected to the expansion end of the volute, and a cryogenic heat insulation buffer plate is provided between the expansion end of the volute and the inner end face of the flange, wherein the cryogenic heat insulation buffer plate is made of epoxy fiberglass plate.

[0005] In a specific embodiment of this utility model, the low-temperature insulation buffer plate has a temperature tolerance of -150 to -200℃.

[0006] In another specific embodiment of this utility model, a pair of spring-loaded sealing rings are also included. The pair of spring-loaded sealing rings are respectively disposed between the inner surface of the low-temperature insulation buffer plate and the expansion end of the volute, and between the outer surface of the low-temperature insulation buffer plate and the inner end face of the flange.

[0007] In another specific embodiment of this utility model, a pair of silicone O-rings are also included, which are correspondingly arranged around the outside of the pair of spring energy storage sealing rings.

[0008] This invention uses a low-temperature insulating epoxy fiberglass plate as an insulating buffer plate between the expansion end volute (internal low temperature) and the connecting flange (external normal temperature). This plate has a conductivity coefficient of only 2.5% compared to stainless steel, thus effectively reducing the cold loss caused by material conduction and greatly reducing the probability and thickness of icing on the external flange. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the connection structure between the volute and flange of an existing expander.

[0010] Figure 2 This is a schematic diagram of the connection structure between the volute and the flange of the expander described in this utility model;

[0011] Figure 3 for Figure 2 Enlarged view of part A in the middle.

[0012] In the diagram: 1. Vortex casing; 11. Air inlet; 12. Air outlet; 2. Flange; 3. Low-temperature insulation buffer plate; 4. Spring energy storage sealing ring; 5. Silicone O-ring. Detailed Implementation

[0013] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.

[0014] In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this utility model.

[0015] Please see Figure 2 This utility model relates to an integral insulation structure for a cryogenic expander, including a volute 1 and an impeller (not shown) coaxially arranged with the volute 1. The volute 1 has an inlet 11 and an outlet 12. After high-pressure gas expands, it enters the volute 1 through the inlet 11 and is then discharged through the outlet. The expanded high-pressure gas releases energy to drive the impeller to rotate. The rotational power of the impeller is converted into energy, and cryogenic temperature is achieved. Expanders typically use high-speed motors, generators, fans, booster pumps, and other transmission equipment as driven ends. The transmission equipment can recover energy for compressing gas to output electricity or drive other equipment.

[0016] The volute 1 is connected to a flange 2 at its expansion end, and the drive shaft of the transmission device passes through the flange 2 and is connected to the impeller for transmission. Typically, both the volute 1 and the flange 2 are made of stainless steel. To prevent direct contact and heat conduction between the volute 1 and the flange 2, this invention provides a low-temperature insulating buffer plate 3 between the expansion end of the volute 1 and the inner end face of the flange 2, completely separating the volute 1 and the flange 2. The aforementioned low-temperature insulation buffer plate 3 is made of epoxy fiberglass sheet with a temperature tolerance of -150 to -200℃. In this embodiment, the low-temperature insulation buffer plate 3 is Z3849, a type of low-temperature insulation epoxy fiberglass sheet for -196℃, used for insulation between the low temperature inside the expander and the normal temperature outside. The standard Q / JD10-174-2022 specifies the model, technical requirements, and acceptance rules of the low-temperature insulation epoxy fiberglass sheet material for -196℃. The thermal conductivity of this type of low-temperature insulation epoxy fiberglass sheet for -196℃ is ≤0.55, and the vertical thermal conductivity is ≤0.45 (unit: W / m·K). Since it has only 2.5% of the conductivity coefficient compared to stainless steel, it can effectively reduce the cold loss caused by material conduction, and greatly reduce the probability and thickness of icing on flange 2.

[0017] See Figure 3 Furthermore, this utility model also includes a pair of spring-loaded sealing rings 4 and a pair of silicone O-rings 5. The pair of spring-loaded sealing rings 4 are correspondingly disposed between the inner surface of the low-temperature insulation buffer plate 3 and the expansion end of the volute 1, and between the outer surface of the low-temperature insulation buffer plate 3 and the inner end face of the flange 2. The pair of silicone O-rings 5 ​​are correspondingly disposed around the outer side of the pair of spring-loaded sealing rings 4. The double-layer sealing structure formed by the spring-loaded sealing rings 4 and the silicone O-rings 5 ​​ensures the sealing performance of the connection between the volute 1 and the flange 2, avoids leakage of internal low-temperature high-pressure gas, ensures the low-temperature output effect of the expander, and improves the reliability of equipment operation.

[0018] This invention has a simple and reliable structure, which can effectively prevent the low-temperature medium inside the expansion end of the vortex shell 1 from being conducted to the outside, thus avoiding the loss of cold energy and achieving the purpose of the invention.

Claims

1. A monolithic adiabatic structure for a cryogenic expander, comprising a volute (1) having an inlet (11) and an outlet (12), said volute (1) being connected at the expansion end to a flange (2), characterized in that: Low-temperature heat-insulating buffer plates (3) made of epoxy glass steel plates are arranged between the expansion end of the scroll (1) and the inner end surface of the flange (2).

2. An integrated thermal insulation structure for a cryogenic expander according to claim 1, characterized in that: The low-temperature heat-insulating buffer plates (3) can withstand a temperature of -150 to -200℃.

3. An integrated thermal insulation structure for a cryogenic expander as defined in claim 1, wherein: A pair of spring energy storage sealing rings (4) are arranged between the inner surface of the low-temperature heat-insulating buffer plates (3) and the expansion end of the scroll (1) and between the outer surface of the low-temperature heat-insulating buffer plates (3) and the inner end surface of the flange (2).

4. A monolithic thermal insulation structure for a cryogenic expander according to claim 3, characterized in that: A pair of silica gel O-shaped rings (5) are arranged around the outside of the pair of spring energy storage sealing rings (4).

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