A sleeve coil heat exchanger and its manufacturing method and manufacturing device

Abstract

The present invention discloses a sleeve coil heat exchanger and a manufacturing method and a manufacturing device thereof, wherein the heat exchanger comprises a coil and a sleeve, and the outer wall surface of the sleeve is provided with a spiral semicircular groove, and the manufacturing method comprises: obtaining coil manufacturing parameters and sleeve manufacturing parameters; the coil manufacturing parameters include coil parameters, fluid parameters, temperatures at both ends of the heat exchanger, and target cooling capacity; determining the coil length according to the coil manufacturing parameters; determining the size of the sleeve according to the sleeve manufacturing parameters, the coil parameters, and the coil length. The purpose of the present invention is to provide a sleeve coil heat exchanger and a manufacturing method and a manufacturing device thereof, which are used to achieve more efficient heat exchange between a refrigerator and a circulating fluid.

Description

Technical Field

[0001] The invention relates to the field of refrigeration and cryogenic engineering, and in particular to a sleeve coil heat exchanger and a manufacturing method and a manufacturing device thereof. Background Art

[0002] As a refrigeration technology that can provide low temperatures of 120K and below, cryogenic refrigeration technology has played a very important role in many fields. In the fields of photoelectric detection and related military and aerospace, cryogenic refrigeration technology, as an important supporting discipline, has played a vital role in improving detector filtering and sensitivity. It also plays a key supporting role in many scientific research fields such as condensed matter physics and high and low temperature superconductivity. With the continuous development of technology in commercial and civilian scientific fields such as medicine and energy, it has also spawned applications such as nuclear magnetic resonance, superconducting cellular base stations, natural gas liquefaction, superconducting cables, and superconducting motors that require the support of cryogenic engineering disciplines.

[0003] One of the main ways to provide a low-temperature environment is through a cryogenic refrigerator. As a critical component of a cryogenic refrigerator, it is particularly important to manufacture a heat exchanger to achieve efficient heat exchange. In the existing methods of manufacturing heat exchangers, the average temperature of the hot and cold ends of the heat exchanger is often used as a manufacturing parameter to manufacture the heat exchanger, ignoring the impact of other manufacturing parameters on the overall performance of the heat exchanger, and failing to achieve more efficient heat exchange between the refrigerator and the circulating fluid. Summary of the invention

[0004] The object of the present invention is to provide a sleeve coil heat exchanger and a manufacturing method and a manufacturing device thereof, which are used to achieve more efficient heat exchange between a refrigerator and a circulating fluid.

[0005] In view of this, the present invention provides a method for manufacturing a sleeve coil heat exchanger, comprising:

[0006] Obtaining coil manufacturing parameters and sleeve manufacturing parameters; the coil manufacturing parameters include coil parameters, fluid parameters, temperatures at both ends of the heat exchanger, and target cooling capacity;

[0007] Determining the coil length according to the coil manufacturing parameters;

[0008] The size of the sleeve is determined according to the sleeve manufacturing parameters, the coil parameters and the coil length.

[0009] Optionally, the coil parameters include the inner diameter of the coil, the outer diameter of the coil, the radius of curvature of the coil, the heat transfer factor inside the coil, the heat transfer height of the coil and the thermal conductivity of the coil.

[0010] Optionally, the fluid parameters include fluid thermal conductivity and Prandtl number.

[0011] Optionally, determining the coil length according to the coil manufacturing parameters specifically includes:

[0012] Determining a heat release coefficient in the coil according to the inner diameter of the coil, the radius of curvature of the coil, the heat transfer factor in the coil, the thermal conductivity of the fluid and the Prandtl number;

[0013] Determine the heat transfer coefficient of the outer surface of the coil according to the inner diameter of the coil, the outer diameter of the coil, the heat transfer height of the coil, the thermal conductivity of the coil and the heat release coefficient in the coil;

[0014] Obtaining the required heat transfer area of ​​the coil according to the target cooling capacity, the temperatures at both ends of the heat exchanger, and the heat transfer coefficient of the outer surface of the coil;

[0015] The actual heat transfer area of ​​the coil is determined according to the required heat transfer area of ​​the coil, and the length of the coil is determined according to the actual heat transfer area and the inner diameter of the coil.

[0016] Optionally, the heat release coefficient in the coil is determined according to the inner diameter of the coil, the radius of curvature of the coil, the heat transfer factor in the coil, the thermal conductivity of the fluid and the Prandtl number as follows:

[0017] α 1 =j×(λ 1 / d 1 )Pr 1 / 3 (1+1.77d 1 / R)

[0018] Among them, α 1 is the heat release coefficient in the tube, j is the heat transfer factor in the coil, and it can be obtained from the relationship curve between j and Reynolds number, λ 1 is the thermal conductivity of the fluid, d 1 is the inner diameter of the coil, Pr is the Prandtl number, and R is the radius of curvature of the coil.

[0019] Optionally, the heat transfer coefficient of the outer surface of the coil is determined according to the inner diameter of the coil, the outer diameter of the coil, the heat transfer height of the coil, the thermal conductivity of the coil and the heat release coefficient in the coil as follows:

[0020]

[0021] Where K is the heat transfer coefficient of the outer surface of the coil, α 1 is the heat release coefficient in the coil, d 2 is the outer diameter of the coil, d 1 is the inner diameter of the coil, δ is the heat transfer height of the coil, λ 2 is the thermal conductivity of the coil.

[0022] Optionally, the required heat transfer area of ​​the coil is obtained according to the target cooling capacity, the temperatures at both ends of the heat exchanger and the heat transfer coefficient of the outer surface of the coil:

[0023]

[0024] Among them, A is the required heat transfer area of ​​the coil, Q is the target cooling capacity, K is the heat transfer coefficient of the outer surface of the coil, △t 1 is the maximum temperature difference between the two ends of the heat exchanger, △t 2 is the minimum temperature difference across the heat exchanger.

[0025] Optionally, the actual heat transfer area of ​​the coil is determined according to the required heat transfer area of ​​the coil, specifically:

[0026] A ac =1.3A

[0027] Among them, A ac is the actual heat transfer area, A is the required heat transfer area of ​​the coil;

[0028] The coil length is obtained according to the actual heat transfer area and the inner diameter of the coil, specifically:

[0029] L=A ac / (π*d 1 )

[0030] Where L is the coil length, A ac is the actual heat transfer area, d 1 is the inner diameter of the coil.

[0031] Optionally, the manufacturing parameters of the sleeve include the spacing between the spiral semicircular grooves, the bottom thickness of the sleeve and the refrigerator cold head, and the outer diameter of the refrigerator cold head; the size of the sleeve includes the inner diameter of the sleeve, the outer diameter of the sleeve, the diameter of the spiral semicircular groove, the number of spiral turns of the spiral semicircular groove, and the length of the sleeve; the determining the size of the sleeve according to the manufacturing parameters of the sleeve, the coil parameters, and the coil length includes:

[0032] Determine the inner diameter of the sleeve according to the outer diameter of the cold head of the refrigerator;

[0033] Determine the outer diameter of the sleeve according to the inner diameter of the sleeve and the outer diameter of the coil;

[0034] Determine the diameter of the spiral semicircular groove on the outer wall of the sleeve according to the outer diameter of the coil;

[0035] Determine the number of spiral turns of the spiral semicircular groove according to the outer diameter of the sleeve and the length of the coil;

[0036] The length of the sleeve is determined according to the outer diameter of the coil, the number of spiral turns, the thickness of the bottom surface where the sleeve and the cold head of the refrigerator are installed, and the spacing between the spiral semicircular grooves.

[0037] A second aspect of the present application provides a manufacturing device for a sleeve coil heat exchanger, comprising a parameter acquisition module, a first determination module, and a second determination module;

[0038] The parameter acquisition module is used to acquire coil manufacturing parameters and sleeve manufacturing parameters; the coil manufacturing parameters include coil parameters, fluid parameters, temperatures at both ends of the heat exchanger, and target cooling capacity;

[0039] The first determination module is used to determine the length of the coil according to the coil manufacturing parameters;

[0040] The second determination module is used to determine the size of the sleeve according to the sleeve manufacturing parameters, the coil parameters and the coil length.

[0041] A third aspect of the present application provides a sleeve coil heat exchanger, wherein the coil and the sleeve are manufactured according to a manufacturing method of a sleeve coil heat exchanger according to the first aspect.

[0042] Optionally, the coil is embedded in a spiral semicircular groove on the outer wall of the sleeve.

[0043] It can be seen from the above technical solutions that the advantages of the present invention are:

[0044] The present invention obtains coil manufacturing parameters and sleeve manufacturing parameters; the coil manufacturing parameters include coil parameters, fluid parameters, temperatures at both ends of a heat exchanger, and a target cooling capacity; the coil length is determined according to the coil manufacturing parameters; and the size of the sleeve is determined according to the sleeve manufacturing parameters, the coil parameters, and the coil length.

[0045] When designing the coil according to the technical solution provided in this application, not only the temperature at both ends of the heat exchanger is considered, but also the influence of the coil parameters, fluid parameters and target cooling capacity on the overall efficiency of the heat exchanger is considered. Based on the above preset parameters, the coil length that meets the actual heat exchange needs is designed; further, the sleeve specifications are determined according to the outer diameter of the coil, the coil length, the spacing between the spiral semicircular grooves, the bottom thickness of the sleeve and the refrigerator cold head installation, and the outer diameter of the refrigerator cold head. The heat exchanger is designed according to the obtained coil length and sleeve specifications, and more efficient heat exchange between the refrigerator and the circulating fluid is achieved through the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0047] Figure 1 A schematic flow chart of an embodiment of a method for manufacturing a sleeve coil heat exchanger provided by the present invention;

[0048] Figure 2 It is a structural schematic diagram of an embodiment of a manufacturing device for a sleeve coil heat exchanger;

[0049] Figure 3 A schematic diagram of structural parameters of a coil sleeve heat exchanger manufactured by a manufacturing method provided in one embodiment of the present invention;

[0050] Figure 4 A schematic structural diagram of a coil sleeve heat exchanger manufactured by a manufacturing method provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0051] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] See also Figure 1 , the following is an embodiment of a method for manufacturing a sleeve coil heat exchanger provided by the present invention.

[0053] The present invention provides a method for manufacturing a sleeve coil heat exchanger, wherein the heat exchanger comprises a coil and a sleeve, and the outer wall surface of the sleeve is provided with a spiral semicircular groove. The manufacturing method comprises:

[0054] Step S1: Obtain coil manufacturing parameters and sleeve manufacturing parameters; the coil manufacturing parameters include coil parameters, fluid parameters, temperatures at both ends of the heat exchanger, and target cooling capacity;

[0055] It should be noted that the target cooling capacity is the cooling capacity required for heat exchange by a single heat exchanger. Since the cooling capacity required for heat exchange by a single heat exchanger is usually within 100W, a coil with an inner diameter of 8-10mm should be selected; since the working pressure is usually lower than 5Mpa, a coil with a wall thickness of 1mm should be selected; the manufacturing parameters of the sleeve include the spacing between the spiral semicircular grooves, the bottom thickness of the sleeve and the refrigerator cold head installation, and the outer diameter of the refrigerator cold head; the coil parameters include the inner diameter of the coil, the outer diameter of the coil, the curvature radius of the coil, the heat transfer factor in the coil, the heat transfer height of the coil and the thermal conductivity of the coil; the fluid parameters include the thermal conductivity of the fluid and the Prandtl number.

[0056] Step S2: determining the coil length according to the coil manufacturing parameters;

[0057] Step S3: Determine the size of the sleeve according to the sleeve manufacturing parameters, the coil parameters and the coil length.

[0058] It should be noted that the dimensions of the sleeve include the inner diameter of the sleeve, the outer diameter of the sleeve, the diameter of the spiral semicircular groove, the number of spiral turns of the spiral semicircular groove and the length of the sleeve.

[0059] When designing the coil according to the technical solution provided in this application, the embodiment of the present invention not only considers the temperature at both ends of the heat exchanger, but also considers the influence of the coil parameters, fluid parameters and target cooling capacity on the overall efficiency of the heat exchanger. The coil length that meets the actual heat exchange needs is designed based on the above preset parameters; further, the specifications of the sleeve are determined according to the outer diameter of the coil, the coil length, the spacing between the spiral semicircular grooves, the bottom thickness of the sleeve and the refrigerator cold head installation, and the outer diameter of the refrigerator cold head. The heat exchanger is designed according to the obtained coil length and sleeve specifications, and more efficient heat exchange between the refrigerator and the circulating fluid is achieved through the heat exchanger.

[0060] The above is a description of a flow chart of an embodiment of a method for manufacturing a sleeve coil heat exchanger provided by the present invention. The following is a description of another embodiment of a method for manufacturing a sleeve coil heat exchanger provided by the present invention.

[0061] In a specific embodiment, based on the first embodiment of the present application, step S2 specifically includes:

[0062] Step S21: determining the heat release coefficient in the coil according to the inner diameter of the coil, the radius of curvature of the coil, the heat transfer factor in the coil, the thermal conductivity of the fluid and the Prandtl number;

[0063] Step S22: determining the heat transfer coefficient of the outer surface of the coil according to the inner diameter of the coil, the outer diameter of the coil, the heat transfer height of the coil, the thermal conductivity of the coil and the heat release coefficient in the coil;

[0064] Step S23: obtaining the required heat transfer area of ​​the coil according to the target cooling capacity, the temperatures at both ends of the heat exchanger and the heat transfer coefficient of the outer surface of the coil;

[0065] Step S24: determining the actual heat transfer area of ​​the coil according to the required heat transfer area of ​​the coil, and determining the coil length according to the actual heat transfer area and the first coil parameter.

[0066] Furthermore, in a specific embodiment, the heat release coefficient in the coil is determined according to the inner diameter of the coil, the curvature radius of the coil, the heat transfer factor in the coil, the thermal conductivity of the fluid and the Prandtl number as follows:

[0067] α 1 =j×(λ 1 / d 1 )Pr 1 / 3 (1+1.77d 1 / R)

[0068] Among them, α 1 is the heat release coefficient in the tube, j is the heat transfer factor in the coil, and it can be obtained from the relationship curve between j and Reynolds number, λ 1 is the thermal conductivity of the fluid, d 1 is the inner diameter of the coil, Pr is the Prandtl number, and R is the curvature radius of the coil;

[0069] The heat transfer coefficient of the outer surface of the coil is determined according to the inner diameter of the coil, the outer diameter of the coil, the heat transfer height of the coil, the thermal conductivity of the coil, and the heat release coefficient in the coil:

[0070]

[0071] Where K is the heat transfer coefficient of the outer surface of the coil, α 1 is the heat release coefficient in the coil, d 2 is the outer diameter of the coil, d 1 is the inner diameter of the coil, δ is the heat transfer height of the coil, λ 2 is the thermal conductivity of the coil;

[0072] The required heat transfer area of ​​the coil is obtained according to the target cooling capacity, the temperature at both ends of the heat exchanger and the heat transfer coefficient of the outer surface of the coil:

[0073]

[0074] Among them, A is the required heat transfer area of ​​the coil, Q is the target cooling capacity, K is the heat transfer coefficient of the outer surface of the coil, △t 1 is the maximum temperature difference between the two ends of the heat exchanger, △t 2 is the minimum temperature difference between the two ends of the heat exchanger;

[0075] The actual heat transfer area of ​​the coil is determined according to the required heat transfer area of ​​the coil:

[0076] A ac =1.3A

[0077] Among them, A ac is the actual heat transfer area, A is the required heat transfer area of ​​the coil;

[0078] The coil length obtained according to the actual heat transfer area and the inner diameter of the coil is:

[0079] L=A ac / (π*d 1 )

[0080] Where L is the coil length, A ac is the actual heat transfer area, d 1 is the inner diameter of the coil.

[0081] Furthermore, step S3 of the first embodiment specifically includes:

[0082] Step S31: determining the inner diameter of the sleeve according to the outer diameter of the cold head of the refrigerator;

[0083] Step S32: determining the outer diameter of the sleeve according to the inner diameter of the sleeve and the outer diameter of the coil;

[0084] Step S33: determining the diameter of the spiral semicircular groove on the outer wall of the sleeve according to the outer diameter of the coil;

[0085] Step S34: determining the number of spiral turns of the spiral semicircular groove according to the outer diameter of the sleeve and the length of the coil;

[0086] Step S35: determining the length of the sleeve according to the outer diameter of the coil, the number of spiral turns, the thickness of the bottom surface where the sleeve and the cold head of the refrigerator are installed, and the spacing between the spiral semicircular grooves;

[0087] Furthermore, in a specific embodiment, the inner diameter of the sleeve is determined according to the outer diameter of the cold head of the refrigerator:

[0088] D TI =D C +0.1mm

[0089] Among them, D TI is the inner diameter of the sleeve, and Dc is the outer diameter of the refrigerator cold head.

[0090] The outer diameter of the sleeve is determined according to the inner diameter of the sleeve and the outer diameter of the coil:

[0091] D TO =D TI +d 2 +3mm

[0092] Among them, D TO is the outer diameter of the sleeve, D TI is the inner diameter of the sleeve, d 2 is the outer diameter of the coil.

[0093] Determine the diameter of the spiral semicircular groove on the outer wall of the sleeve according to the outer diameter of the coil;

[0094] It should be noted that the outer diameter of the coil is equal to the diameter of the spiral semicircular groove.

[0095] The number of spiral turns of the spiral semicircular groove is determined according to the outer diameter of the sleeve and the length of the coil:

[0096] N=[L / (π*D TO )]

[0097] Where N is the number of spiral turns, L is the coil length, and D TO is the outer diameter of the sleeve.

[0098] The sleeve length is determined according to the outer diameter of the coil, the number of spiral turns, the thickness of the bottom surface where the sleeve is mounted on the cold head of the refrigerator, and the spacing between the spiral semicircular grooves:

[0099] L T =N*d 2 +(N-1)*n+h mm

[0100] Among them, L T is the sleeve length, N is the number of spiral turns, d 2 is the outer diameter of the coil, n is the spacing between the spiral semicircular grooves, and h is the bottom thickness of the sleeve and the cold head of the refrigerator.

[0101] The above is a description of a specific embodiment of a method for manufacturing a sleeve coil heat exchanger provided by the present invention. It should be noted that in the above embodiment, the coil material is copper tube, and the above coil parameters are copper tube parameters; the fluid is low-temperature helium, and the fluid parameters are specifically helium parameters.

[0102] Furthermore, the present invention also provides an embodiment of a manufacturing device for a sleeve coil heat exchanger, see Figure 2 In this embodiment, the manufacturing device of the sleeve coil heat exchanger specifically includes a parameter acquisition module, a first determination module and a second determination module;

[0103] The parameter acquisition module 101 is used to acquire coil manufacturing parameters and sleeve manufacturing parameters; the coil manufacturing parameters include coil parameters, fluid parameters, temperatures at both ends of the heat exchanger, and target cooling capacity;

[0104] The first determination module 102 is used to determine the length of the coil according to the coil manufacturing parameters;

[0105] The second determination module 103 is used to determine the size of the sleeve according to the sleeve manufacturing parameters, the coil parameters and the coil length.

[0106] Furthermore, the present invention also provides a sleeve-coil heat exchanger manufactured according to the above-mentioned method for manufacturing a sleeve-coil heat exchanger, comprising a coil and a sleeve of the sleeve-coil heat exchanger manufactured according to the above-mentioned method; Figure 3 , Figure 4 They are respectively a schematic diagram of structural parameters of a coil-tube sleeve type heat exchanger manufactured by a manufacturing method provided in one embodiment of the present application and a schematic diagram of the structure of a coil-tube sleeve type heat exchanger manufactured by a manufacturing method provided in one embodiment of the present application.

[0107] like Figure 3 The heat exchanger shown in FIG. TO is the outer diameter of the sleeve, D TI is the inner diameter of the sleeve, L T is the sleeve length, d 1 is the inner diameter of the coil, d 2 is the outer diameter of the coil; Figure 4 The heat exchanger shown in the figure, wherein 1 is a sleeve, 2 is a coil, 3 is an inlet joint of the heat exchanger, and 4 is an outlet joint of the heat exchanger.

[0108] In this embodiment, the coil parameters include copper tube parameters; the fluid parameters include helium parameters, wherein the coil is embedded in the spiral semicircular groove on the outer wall of the sleeve.

[0109] It should be understood that the present invention does not limit the connection joints of the coil, and those skilled in the art can select appropriate heat exchanger inlet and outlet joints according to actual needs and braze them to the coil inlet and outlet.

[0110] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for manufacturing a sleeve coil heat exchanger, It is characterized in that The heat exchanger comprises a coil and a sleeve, wherein the outer wall surface of the sleeve is provided with a spiral semicircular groove, and the manufacturing method comprises: Obtaining coil manufacturing parameters and sleeve manufacturing parameters; the coil manufacturing parameters include coil parameters, fluid parameters, temperatures at both ends of the heat exchanger, and target cooling capacity; Determining the coil length according to the coil manufacturing parameters; Determine the size of the sleeve according to the sleeve manufacturing parameters, the coil parameters and the coil length; The coil parameters include the inner diameter of the coil, the outer diameter of the coil, the curvature radius of the coil, the heat transfer factor in the coil, the heat transfer height of the coil and the thermal conductivity of the coil; The manufacturing parameters of the sleeve include the spacing between the spiral semicircular grooves, the thickness of the bottom surface of the sleeve and the refrigerator cold head, and the outer diameter of the refrigerator cold head; the size of the sleeve includes the inner diameter of the sleeve, the outer diameter of the sleeve, the diameter of the spiral semicircular groove, the number of spiral turns of the spiral semicircular groove, and the length of the sleeve; the size of the sleeve determined according to the manufacturing parameters of the sleeve, the coil parameters, and the coil length includes: Determine the inner diameter of the sleeve according to the outer diameter of the cold head of the refrigerator; Determine the outer diameter of the sleeve according to the inner diameter of the sleeve and the outer diameter of the coil; Determine the diameter of the spiral semicircular groove on the outer wall of the sleeve according to the outer diameter of the coil; Determine the number of spiral turns of the spiral semicircular groove according to the outer diameter of the sleeve and the length of the coil; The length of the sleeve is determined according to the outer diameter of the coil, the number of spiral turns, the thickness of the bottom surface where the sleeve and the cold head of the refrigerator are installed, and the spacing between the spiral semicircular grooves.

2. A method for manufacturing a sleeve coil heat exchanger according to claim 1, It is characterized in that The fluid parameters include fluid thermal conductivity and Prandtl number.

3. A method for manufacturing a sleeve coil heat exchanger according to claim 2, It is characterized in that Determining the coil length according to the coil manufacturing parameters specifically includes: Determining a heat release coefficient in the coil according to the inner diameter of the coil, the radius of curvature of the coil, the heat transfer factor in the coil, the thermal conductivity of the fluid and the Prandtl number; Determine the heat transfer coefficient of the outer surface of the coil according to the inner diameter of the coil, the outer diameter of the coil, the heat transfer height of the coil, the thermal conductivity of the coil and the heat release coefficient in the coil; Obtaining the required heat transfer area of ​​the coil according to the target cooling capacity, the temperatures at both ends of the heat exchanger, and the heat transfer coefficient of the outer surface of the coil; The actual heat transfer area of ​​the coil is determined according to the required heat transfer area of ​​the coil, and the length of the coil is determined according to the actual heat transfer area and the inner diameter of the coil.

4. A method for manufacturing a sleeve coil heat exchanger according to claim 3, It is characterized in that The heat release coefficient in the coil is determined according to the inner diameter of the coil, the curvature radius of the coil, the heat transfer factor in the coil, the thermal conductivity of the fluid and the Prandtl number as follows: α 1 =j×(λ 1 / d 1 )Pr 1 / 3 (1+1.77d 1 / R); Among them, α 1 is the heat release coefficient in the coil, j is the heat transfer factor in the coil, and it can be obtained from the relationship curve between j and Reynolds number, λ 1 is the thermal conductivity of the fluid, d 1 is the inner diameter of the coil, Pr is the Prandtl number, and R is the radius of curvature of the coil.

5. The method for manufacturing a sleeve coil heat exchanger according to claim 3, It is characterized in that The heat transfer coefficient of the outer surface of the coil is determined according to the inner diameter of the coil, the outer diameter of the coil, the heat transfer height of the coil, the thermal conductivity of the coil and the heat release coefficient in the coil as follows: ； Where K is the heat transfer coefficient of the outer surface of the coil, α 1 is the heat release coefficient in the coil, d 2 is the outer diameter of the coil, d 1 is the inner diameter of the coil, δ is the heat transfer height of the coil, λ 2 is the thermal conductivity of the coil.

6. A method for manufacturing a sleeve coil heat exchanger according to claim 3, It is characterized in that The required heat transfer area of ​​the coil is obtained according to the target cooling capacity, the temperature at both ends of the heat exchanger and the heat transfer coefficient of the outer surface of the coil: ； Among them, A is the required heat transfer area of ​​the coil, Q is the target cooling capacity, K is the heat transfer coefficient of the outer surface of the coil, △t 1 is the maximum temperature difference between the two ends of the heat exchanger, △t 2 is the minimum temperature difference across the heat exchanger.

7. The method for manufacturing a sleeve coil heat exchanger according to claim 3, It is characterized in that The actual heat transfer area of ​​the coil is determined according to the required heat transfer area of ​​the coil, specifically: A ac =1.3A; Among them, A ac is the actual heat transfer area, A is the required heat transfer area of ​​the coil; The coil length is obtained according to the actual heat transfer area and the inner diameter of the coil, specifically: L=A ac / (π*d 1 ); Where L is the coil length, A ac is the actual heat transfer area, d 1 is the inner diameter of the coil.

8. A manufacturing device for a sleeve coil heat exchanger, It is characterized in that It includes a parameter acquisition module, a first determination module and a second determination module; The parameter acquisition module is used to acquire coil manufacturing parameters and sleeve manufacturing parameters; the coil manufacturing parameters include coil parameters, fluid parameters, temperatures at both ends of the heat exchanger, and target cooling capacity; The first determination module is used to determine the length of the coil according to the coil manufacturing parameters; The second determination module is used to determine the size of the sleeve according to the sleeve manufacturing parameters, the coil parameters and the coil length; The coil parameters include the inner diameter of the coil, the outer diameter of the coil, the curvature radius of the coil, the heat transfer factor in the coil, the heat transfer height of the coil and the thermal conductivity of the coil; The manufacturing parameters of the sleeve include the spacing between the spiral semicircular grooves, the thickness of the bottom surface of the sleeve and the refrigerator cold head, and the outer diameter of the refrigerator cold head; the size of the sleeve includes the inner diameter of the sleeve, the outer diameter of the sleeve, the diameter of the spiral semicircular groove, the number of spiral turns of the spiral semicircular groove, and the length of the sleeve; the size of the sleeve determined according to the manufacturing parameters of the sleeve, the coil parameters, and the coil length includes: Determine the inner diameter of the sleeve according to the outer diameter of the cold head of the refrigerator; Determine the outer diameter of the sleeve according to the inner diameter of the sleeve and the outer diameter of the coil; Determine the diameter of the spiral semicircular groove on the outer wall of the sleeve according to the outer diameter of the coil; Determine the number of spiral turns of the spiral semicircular groove according to the outer diameter of the sleeve and the length of the coil; The length of the sleeve is determined according to the outer diameter of the coil, the number of spiral turns, the thickness of the bottom surface where the sleeve and the cold head of the refrigerator are installed, and the spacing between the spiral semicircular grooves.

9. A sleeve coil heat exchanger, It is characterized in that The coil and sleeve of the sleeve coil heat exchanger are manufactured according to the manufacturing method of a sleeve coil heat exchanger according to any one of claims 1-7.

10. The sleeve coil heat exchanger according to claim 9, It is characterized in that The coil is embedded in the spiral semicircular groove on the outer wall of the sleeve.

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