Wound pipe type throttling refrigerator

Abstract

The invention provides a coiled tube type throttling refrigerator which comprises a shell part, a heat exchange part, a heat exchange part, a heat exchange part, a heat exchange part and a heat exchange part, the shell part is provided with an inlet part shell and a heat exchange part shell, and the inlet part shell is used for introducing first fluid; the heat exchange part is arranged in the heat exchange part shell and used for circulating first fluid introduced from the inlet part shell, the heat exchange part and the heat exchange part shell form a shell side fluid cavity, and the shell side fluid cavity is used for containing second fluid and enabling the first fluid and the second fluid to conduct heat exchange; the throttling plate is connected with the heat exchange part and used for refrigerating the first fluid from the heat exchange part; the refrigerating part is connected with the throttling plate and used for containing the refrigerated first fluid, the first fluid forms a gas-liquid mixture in the refrigerating part and forms a second fluid after absorbing heat of an external heat source, and the second fluid further enters the shell side fluid cavity through the throttling plate. And the returned fluid and the fluid in the heat transfer pipe are subjected to efficient regenerative heat exchange, so that the refrigerating capacity is further improved.

Description

Technical Field

[0001] The present invention relates to the technical fields of heat transfer and refrigeration, and particularly to a coiled-tube throttling refrigerator. Background Art

[0002] A coiled-tube heat exchanger is a high-efficiency heat exchange device. Due to its unique spiral-wound tube bundle design, it has a high heat transfer coefficient and heat transfer effectiveness, and allows operation under high pressure. The structure of the coiled-tube heat exchanger mainly consists of inner and outer cylinders, spiral-wound heat transfer tubes, and spacer bars and other components. The spiral arrangement of the heat transfer tubes enables one or more heat transfer tubes to be arranged in parallel on each layer, and through the separation and fixing effects of the spacer bars, the heat transfer tubes can be arranged in multiple layers, greatly increasing the heat transfer area. The special arrangement of the heat transfer tubes in the coiled-tube heat exchanger makes its structure compact. The heat transfer tubes are alternately wound at a certain spiral angle to form a multi-layer spiral structure. Due to the existence of the spiral structure on the tube side, the centrifugal force is strong, and the fluid continuously winds around the heat transfer tubes, forming a turbulent flow, and the surface heat transfer coefficient is relatively high. The spiral directions of adjacent tube layers are opposite, and the tubes of adjacent layers are spaced by spacer bars to maintain a uniform spacing. On the shell side, the space between the spacer bars and the tube shell is the shell-side fluid space. Its structure is complex, the heat exchange area is large, a turbulent flow is formed, and the surface heat transfer coefficient is also very high. Both the tube side and the shell side have a high surface heat transfer coefficient, high heat transfer effectiveness, and good heat transfer effect.

[0003] The Joule-Thomson throttling refrigeration technology, also known as the Joule-Thomson refrigeration technology, is a method of achieving refrigeration by using the temperature change of a gas during the throttling process. This technology has the advantages of small volume, low refrigeration temperature, fast cooling rate, no moving parts at the low-temperature end, and high reliability. In gas liquefaction and cryogenic refrigeration technologies, the Joule-Thomson throttling refrigeration effect is a commonly used method. However, in existing Hampson-type Joule-Thomson throttling refrigerators, the refrigeration capacity is usually relatively small, and in specific scenarios, multiple refrigerators often need to be used in parallel to meet the requirements. Summary of the Invention

[0004] The present invention is made to solve the above problems, and aims to provide a coiled-tube throttling refrigerator.

[0005] The present invention provides a coiled tube throttling refrigerator, which has the following characteristics: it includes a housing part having an inlet housing and a heat exchange housing, where the inlet housing is used to introduce a first fluid; a heat exchange part is disposed within the heat exchange housing, which is used to circulate the first fluid introduced from the inlet housing and form a shell-side fluid cavity with the heat exchange housing. The shell-side fluid cavity is used to accommodate a second fluid and enable heat exchange between the first fluid and the second fluid; a throttle plate is connected to the heat exchange part and is used to cool the first fluid from the heat exchange part; a refrigeration part is connected to the throttle plate and is used to accommodate the cooled first fluid. The first fluid forms a gas-liquid mixture within the refrigeration part, absorbs the heat of an external heat source to form the second fluid, and the second fluid also enters the shell-side fluid cavity through the throttle plate.

[0006] In the coiled tube throttling refrigerator provided by the present invention, it may further have the following characteristics: among them, the heat exchange part includes: a tube sheet provided with a number of first circular holes of a first size penetrating the tube sheet, which is used to evenly distribute the first fluid; a support member, which is a cylindrical structure and is respectively connected to the tube sheet and the throttle plate, and is used to connect the tube sheet and the throttle plate; a heat transfer tube having a multi-layer structure, with multiple heat transfer tubes in each layer, which is connected to the first circular holes of the tube sheet, and each layer is successively spirally wound around the outside of the support member and is used to enable heat exchange between the first fluid and the second fluid; a spacer strip having a multi-layer structure, with multiple spacer strips in each layer, which is disposed between the heat transfer tubes of each layer and is used to maintain the distance between the heat transfer tubes of each layer.

[0007] In the coiled tube throttling refrigerator provided by the present invention, it may further have the following characteristics: among them, the spiral winding directions of adjacent layers of the heat transfer tubes are opposite.

[0008] In the coiled tube throttling refrigerator provided by the present invention, it may further have the following characteristics: among them, the inlet housing is dish-shaped, with a fluid inlet provided at the top, and the heat exchange housing is a cylindrical empty tube.

[0009] In the coiled tube throttling refrigerator provided by the present invention, it may further have the following characteristics: among them, a discharge opening is further provided on the heat exchange housing and is used to discharge the second fluid.

[0010] In the coiled tube throttling refrigerator provided by the present invention, it may further have the following characteristics: among them, the throttle plate is provided with a number of second circular holes of a second size penetrating the throttle plate and is connected to the heat transfer tubes, and the second size is smaller than the first size.

[0011] In the coiled tube throttling refrigerator provided by the present invention, it may further have the following characteristics: among them, the throttle plate is further provided with a number of third circular holes of a third size, and the third size is larger than the second size.

[0012] In the coiled tube throttling refrigerator provided by the present invention, the following features may also be included: The refrigeration part is also connected to a heat transfer pipeline, and the gas-liquid mixture in the refrigeration part exchanges heat with the external substance in the heat transfer pipeline.

[0013] In the coiled tube throttling refrigerator provided by the present invention, the following features may also be included: The gas-liquid mixture directly exchanges heat with the external heat source through the refrigeration part.

[0014] In the coiled tube throttling refrigerator provided by the present invention, the following features may also be included: The first fluid entering the coiled tube throttling refrigerator and the second fluid flowing out of the coiled tube throttling refrigerator are gases.

[0015] Functions and effects of the invention

[0016] According to the coiled tube throttling refrigerator involved in the present invention, since the coiled tube throttling refrigerator includes: a housing part having an inlet part housing and a heat exchange part housing, the inlet part housing is used for introducing the first fluid; a heat exchange part disposed within the heat exchange part housing for circulating the first fluid introduced from the inlet part housing and forming a shell-side fluid cavity with the heat exchange part housing, the shell-side fluid cavity is used for accommodating the second fluid and enabling the first fluid to exchange heat with the second fluid; a throttle plate connected to the heat exchange part for cooling the first fluid from the heat exchange part; a refrigeration part connected to the throttle plate for accommodating the cooled first fluid, the first fluid forms a gas-liquid mixture within the refrigeration part, absorbs the heat of the external heat source and forms the second fluid, and the second fluid also enters the shell-side fluid cavity through the throttle plate. Therefore, the present invention performs refrigeration through the throttle plate and utilizes the housing structure of the coiled tube heat exchanger to perform efficient regenerative heat exchange between the returned shell-side fluid and the fluid within the heat transfer tube, enhancing the shell-side surface heat transfer coefficient and further increasing the refrigeration capacity. Description of the drawings

[0017] Figure 1 is a front view of the coiled tube throttling refrigerator in the embodiment of the present invention.

[0018] Figure 2 is a schematic structural diagram of the coiled tube throttling refrigerator in the embodiment of the present invention after removing the housing part.

[0019] Figure 3 is a partial axial sectional view of the heat transfer tube in the embodiment of the present invention.

[0020] Figure 4 is a bottom view of the throttle plate in the embodiment of the present invention. Detailed implementation manners

[0021] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" 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 direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0022] In order to make the technical means, creative features, achieved purposes, and effects realized by the present invention easy to understand, the following embodiments will specifically describe the coiled-tube throttling refrigerator of the present invention in conjunction with the accompanying drawings.

[0023] Embodiment

[0024] Figure 1 is the front view of the coiled-tube throttling refrigerator in the embodiment of the present invention.

[0025] Figure 2 is the structural schematic diagram of the coiled-tube throttling refrigerator in the embodiment of the present invention after removing the housing part.

[0026] As Figure 1 and Figure 2 shown, the present embodiment provides a coiled-tube throttling refrigerator 100, including: a housing part 10, a heat exchange part 20, a throttle plate 30, and a refrigeration part 40.

[0027] The housing part 10 has an inlet housing 11 and a heat exchange housing 12. The top of the inlet housing 11 has a fluid inlet 111 for introducing a first fluid. The first fluid is a high-pressure gas. Among them, the inlet housing 11 is dish-shaped, and a cylindrical fluid inlet 111 is provided at the top.

[0028] The heat exchange housing 12 is a cylindrical hollow cylinder. The upper part of the heat exchange housing 12 is also provided with a discharge opening 121 for discharging a second fluid. The second fluid is a low-pressure gas.

[0029] The heat exchange part 20 is partially arranged in the heat exchange housing 12 and is used for circulating the first fluid introduced from the inlet housing 11.

[0030] The heat exchange part 20 includes: a tube sheet 21, a support 22, a heat transfer tube 23, and a gasket 24.

[0031] The tube sheet 21 has a disc-shaped structure. Its upper bottom surface is connected to the inlet part housing 11 to form an inlet cavity, and its lower bottom surface is connected to the heat exchange part housing 12. The tube sheet 21 includes a perforated part and a central part. The perforated part of the tube sheet 21 is provided with first round holes 211 penetrating through the tube sheet 21, which are distributed in an annular shape. The central part of the tube sheet 21 is a solid structure through which the first fluid cannot pass. The first fluid from the inlet cavity flows through the first round holes 211 and is divided by a number of the first round holes 211.

[0032] The support member 22 has a cylindrical structure. Its top is connected to the central part of the tube sheet 21 and is used to support the heat exchange part 20. In this embodiment, the support member 22 is a core column.

[0033] Figure 3 It is a partial axial sectional view of the heat transfer tube in the embodiment of the present invention.

[0034] As Figure 2 and Figure 3 shown, the heat transfer tube 23 has a multi-layer structure, and each layer has multiple heat transfer tubes 23. Each heat transfer tube 23 corresponds to a first round hole 211 and is connected to the corresponding first round hole 211. The heat transfer tube 23 is communicated with the inlet cavity through the first round hole 211. Multiple heat transfer tubes 23 are helically wound around the support member 22 to form a layer of heat transfer tubes 23. Each layer of heat transfer tubes 23 is helically wound around the outside of the support member 22 in sequence from the inside to the outside. In this embodiment, the heat transfer tube 23 has 3 layers. The helical winding directions of adjacent layers of the heat transfer tube 23 are opposite to optimize fluid flow and increase the surface heat transfer coefficient. The heat transfer tube 23 is used to convey the first fluid.

[0035] The spacer strip 24 has a multi-layer structure, and each layer has multiple spacer strips 24. It is arranged between each layer of heat transfer tubes 23 and is used to maintain the distance between different layers of heat transfer tubes 23. The contact surface between each heat transfer tube 23 and the spacer strip 24 is fixed to the spacer strip 24 by spot welding, which plays a role in fixing the heat transfer tube 23. The number of spacer strips 24 in each layer can be set according to requirements.

[0036] Figure 4 It is a bottom view of the throttle plate in the embodiment of the present invention.

[0037] As Figure 2 and Figure 4As shown, the throttle plate 30 is in a disc shape, including a perforated part and a central part. A second round hole 31 penetrating the throttle plate 30 is provided on the perforated part of the throttle plate 30, which is connected to the heat transfer tube 23 and is distributed in a circular ring shape. The size of the second round hole 32 is much smaller than that of the first round hole 211. The central part of the throttle plate 30 is a solid structure and is connected to the support member 22. When the first fluid from the heat transfer tube 23 passes through the second round hole 31, due to flowing through a narrow channel, the flow rate increases and the pressure decreases. The first fluid flows into the refrigeration part 40 under a low-pressure state and forms a gas-liquid mixture. A third round hole 32 is also provided on the perforated part of the throttle plate 30.

[0038] The throttle plate 30 and the space formed by the heat exchange part housing 12, the tube sheet 21 and the heat transfer tube 23 together constitute the shell-side fluid cavity.

[0039] The refrigeration part 40 is connected to the throttle plate 30 and is used to accommodate the gas-liquid mixture formed after the first fluid in the heat transfer tube 23 is refrigerated. The first fluid forms a gas-liquid mixture in the refrigeration part 40, absorbs the heat of the external heat source and then forms a second fluid, and the second fluid flows into the shell-side fluid cavity from the third round hole 32 provided on the throttle plate 30.

[0040] The second fluid in the shell-side fluid cavity exchanges heat with the first fluid in the heat transfer tube 23 to pre-cool the first fluid.

[0041] The refrigeration part 40 is also connected to the heat transfer pipeline, and the gas-liquid mixture in the refrigeration part 40 exchanges heat with the external substance in the heat transfer pipeline. The gas-liquid mixture can also directly exchange heat with the external heat source through the refrigeration part 40.

[0042] The working principle of the coiled-tube throttle refrigerator in this embodiment is as follows:

[0043] In this embodiment, the first fluid flows into the inlet cavity formed by the upper bottom surface of the tube sheet 21 and the inlet part housing from the fluid inlet 111. Subsequently, the first fluid flows through the first round holes 211 distributed in a circular ring shape on the tube sheet 21, is divided by a plurality of first round holes 211, and flows into the heat transfer tubes 23 connected to the first round holes 211 on the tube sheet 21 correspondingly. When the first fluid flowing out of the heat transfer tube 23 passes through the second round hole 31, due to flowing through a narrow channel, the flow rate increases and the pressure decreases. The first fluid flows into the refrigeration part 40 under a low-pressure state and forms a gas-liquid mixture. The gas-liquid mixture absorbs the heat of the external heat source and then forms a second fluid, and the second fluid flows into the shell-side fluid cavity from the third round hole 32 provided on the throttle plate 30. The second fluid in the shell-side fluid cavity exchanges heat with the first fluid in the heat transfer tube again to complete the pre-cooling of the first fluid, and then the second fluid is discharged from the discharge opening 121 on the heat exchange part housing 12.

[0044] Functions and effects of the embodiment

[0045] The coiled throttle refrigerator in this embodiment includes: a housing part, which has an inlet housing and a heat exchange housing. The inlet housing is used to introduce the first fluid; a heat exchange part, which is arranged in the heat exchange housing, is used to circulate the first fluid introduced from the inlet housing, and forms a shell-side fluid cavity with the heat exchange housing. The shell-side fluid cavity is used to accommodate the second fluid and enable the first fluid to exchange heat with the second fluid; a throttle plate, which is connected to the heat exchange part and is used to cool the first fluid from the heat exchange part; a refrigeration part, which is connected to the throttle plate and is used to accommodate the cooled first fluid. The first fluid forms a gas-liquid mixture in the refrigeration part, absorbs the heat of the external heat source to form the second fluid, and the second fluid also enters the shell-side fluid cavity through the throttle plate. Therefore, in this embodiment, refrigeration is carried out through the throttle plate, and by using the housing structure of the coiled heat exchanger, the returned shell-side fluid and the fluid in the heat transfer tube are efficiently regeneratively heat-exchanged, enhancing the shell-side surface heat transfer coefficient and further increasing the refrigeration capacity.

[0046] In this embodiment, a tube sheet is also used to evenly distribute the fluid.

[0047] In this embodiment, a support is also used to connect the tube sheet and the throttle plate and fix the heat exchange part.

[0048] In this embodiment, gaskets are also used to maintain the distances between the support and the heat transfer tubes and between the heat transfer tubes.

[0049] In this embodiment, the adjacent layers of the heat transfer tubes are wound in reverse spirals to increase the tube-side surface heat transfer coefficient, and combined with the increase in the shell-side surface heat transfer coefficient, the heat transfer effectiveness of the coiled throttle refrigerator is greatly improved.

[0050] In this embodiment, a discharge opening is also provided for discharging the second fluid.

[0051] The coiled throttle refrigerator in this embodiment adopts a multi-layer coiled tube structure to increase the fluid flow rate and refrigeration capacity.

[0052] Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A tube-in-tube throttling refrigerator, characterized in that, Comprising: A housing part, having an inlet housing and a heat exchange housing, where the inlet housing is used for introducing a first fluid; A heat exchange part, arranged inside the heat exchange housing, used for circulating the first fluid introduced from the inlet housing, and forming a shell-side fluid cavity with the heat exchange housing, where the shell-side fluid cavity is used for accommodating a second fluid and enabling heat exchange between the first fluid and the second fluid; A throttle plate, connected to the heat exchange part, used for cooling the first fluid from the heat exchange part; A refrigeration part, connected to the throttle plate, used for accommodating the cooled first fluid, where the first fluid forms a gas-liquid mixture inside the refrigeration part, absorbs heat from an external heat source to form the second fluid, and the second fluid also enters the shell-side fluid cavity through the throttle plate.

2. The coiled tube throttling refrigerator according to claim 1, wherein, Comprising: Wherein, the heat exchange part includes: A tube sheet, provided with a number of first circular holes of a first size penetrating the tube sheet, used for evenly distributing the first fluid; A support member, having a cylindrical structure, connected to the tube sheet and the throttle plate respectively, used for connecting the tube sheet and the throttle plate; Heat transfer tubes, having a multi-layer structure, with multiple heat transfer tubes in each layer, connected to the first circular holes of the tube sheet, and each layer is sequentially helically wound around the outside of the support member, used for enabling heat exchange between the first fluid and the second fluid; Gasket strips, having a multi-layer structure, with multiple gasket strips in each layer, arranged between the heat transfer tubes of each layer, used for maintaining the distance between the heat transfer tubes of each layer.

3. The coiled tube throttle refrigerator according to claim 2, characterized in that: Among them, The helical winding directions of adjacent layers of the heat transfer tubes are opposite.

4. The coiled tube throttle refrigerator according to claim 1, characterized in that: Among them, The inlet housing is dish-shaped, with a fluid inlet provided at the top, and the heat exchange housing is a cylindrical hollow cylinder.

5. The coiled tube throttle refrigerator according to claim 1, characterized in that: Among them, The heat exchange housing is further provided with a discharge opening for discharging the second fluid.

6. The coiled tube throttle refrigerator according to claim 1, characterized in that: Among them, The throttle plate is provided with a number of second circular holes of a second size penetrating the throttle plate, connected to the heat transfer tubes, and the second size is smaller than the first size.

7. The coiled tube throttle refrigerator according to claim 1, characterized in that: Among them, The throttle plate is further provided with a number of third circular holes of a third size, and the third size is larger than the second size.

8. The coiled tube throttle refrigerator according to claim 1, characterized in that: Among them, The refrigeration part is further connected to a heat transfer pipeline, and the gas-liquid mixture in the refrigeration part exchanges heat with the external substance in the heat transfer pipeline.

9. The coiled tube throttle refrigerator according to claim 1, characterized in that: Among them, The gas-liquid mixture directly exchanges heat with the external heat source through the refrigeration part.

10. The coiled tube throttle refrigerator according to any one of claims 1-9, characterized in that: Among them, The first fluid entering the coiled tube throttle refrigerator and the second fluid flowing out of the coiled tube throttle refrigerator are gases.

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