Plum blossom type silver powder sintering heat exchange sheet and mixing chamber

Abstract

The invention belongs to the technical field of heat exchangers, powder metallurgy sintering technology application, ultra-low temperature technology, ultra-low temperature equipment and the like, and discloses a plum blossom type silver powder sintering heat exchange sheet and a mixing chamber. The plum blossom type silver powder sintering heat exchange piece comprises a supporting framework and a silver powder sintering block, a threaded hole and a plurality of through holes surrounding the threaded hole are formed in the supporting framework, and the threaded hole is used for being matched with an installation column of the mixing chamber. The silver powder sintered blocks are formed on the two oppositely-arranged faces of the supporting framework through sintering, and the silver powder sintered blocks are provided with connecting parts filled in the through holes. According to the plum blossom type silver powder sintered heat exchange piece, the concentrated-phase or dilute-phase heliumtrihelium tetra mixed liquid and the large surface area of the silver powder sintered block have the sufficient contact condition, the heat exchange effect and the heat exchange efficiency are improved, and the plum blossom type silver powder sintered heat exchange piece is compact in structure and quite suitable for a mixing chamber of a small-refrigerating-capacity dilution refrigerating machine.

Description

Technical Field

[0001] The invention relates to the technical fields of heat exchangers, powder metallurgy sintering technology applications, ultra-low temperature technology and ultra-low temperature equipment, and in particular to a plum blossom type silver powder sintering heat exchanger plate and a mixing chamber. Background Art

[0002] It is necessary to install effective heat exchange devices in ultra-low temperature dilution refrigerators and ultra-low temperature refrigeration devices. However, due to the influence of the ultra-low temperature working environment and the low temperature of the medium, the contact thermal resistance between the heat exchange fluid and the surface of the heat exchange device is very large under low temperature and ultra-low temperature conditions, which greatly affects the performance of the heat exchange device, especially in the mixing chamber of the dilution refrigerator, where the heat exchange effect between general metal materials and structural parts is even worse. Therefore, a large number of closely distributed silver powder heat exchange columns are usually used in the mixing chamber of the ultra-low temperature dilution refrigerator to achieve the function of absorbing heat from the bottom plate and exchanging heat between the helium three concentrated phase and the dilute phase. However, in the case of limited internal space in the mixing chamber of a refrigerator with a small cooling capacity, the silver powder heat exchange column is not easy to install and arrange, and the heat exchange effect is not very good due to the insufficient number of heat exchange columns. Summary of the invention

[0003] The first object of the present invention is to provide a plum blossom type silver powder sintered heat exchanger plate, which allows a dense phase or a dilute phase of helium-3-helium-4 mixed liquid to have sufficient contact conditions with a large surface area of ​​a silver powder sintered block, thereby improving the heat exchange effect and heat exchange efficiency. The plum blossom type silver powder sintered heat exchanger plate has a compact structure and is very suitable for a mixing chamber of a small refrigeration capacity dilution refrigerator.

[0004] A second object of the present invention is to provide a mixing chamber which has good heat exchange effect and high heat exchange efficiency and is very suitable for a dilution refrigerator with a small refrigeration capacity.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The present invention discloses a plum blossom type silver powder sintered heat exchange plate, comprising: a support frame, the support frame is provided with a threaded hole and a plurality of through holes arranged around the threaded hole, the threaded hole is used to cooperate with the mounting column of a mixing chamber; a silver powder sintered block, the silver powder sintered block is formed by sintering on two opposite sides of the support frame, and the silver powder sintered block has a connecting portion filled in the through hole.

[0007] In some embodiments, the plurality of through holes are evenly spaced apart along the circumference of the threaded hole.

[0008] In some embodiments, the support frame is a copper frame.

[0009] In some embodiments, the through hole is a circular hole.

[0010] The present invention further discloses a mixing chamber, comprising a shell and the aforementioned plum blossom-shaped silver powder sintered heat exchange plate, wherein the plum blossom-shaped silver powder sintered heat exchange plate is installed on a mounting column in the shell.

[0011] In some embodiments, a nut for tightening the plum blossom type silver powder sintered heat exchange plate is disposed on the top of the mounting column.

[0012] In some embodiments, the outer shell includes a top plate, a bottom plate and a side wall tube, the top plate and the bottom plate are spaced apart, the two ends of the side wall tube are respectively connected to the top plate and the bottom plate, and a mounting column is provided on the bottom plate, and the mounting column is used to cooperate with the threaded hole of the plum blossom type silver powder sintered heat exchanger.

[0013] In some specific embodiments, the top plate is provided with a first mounting groove that matches with the upper end of the side wall tube.

[0014] In some specific embodiments, the bottom plate is provided with a second mounting groove matched with the lower end of the side wall tube.

[0015] In some embodiments, there are a plurality of the plum blossom-shaped silver powder sintered heat exchanger plates, and the plurality of the plum blossom-shaped silver powder sintered heat exchanger plates are arranged in sequence from top to bottom along the axial direction of the mounting column.

[0016] The plum blossom type silver powder sintered heat exchanger of the present invention has the following beneficial effects: since the support frame with multiple through holes plays a good role in supporting the silver powder sintered block and strengthening heat conduction, combined with the nano-sized porous structure of the silver powder sintered block, the dense phase or dilute phase helium-3-helium-4 mixed liquid has sufficient contact conditions with the large surface area of ​​the silver powder sintered block, thereby improving the heat exchange effect and heat exchange efficiency. In addition, the threaded holes on the support frame are used to cooperate with the mounting columns of the mixing chamber, and two silver powder sintered blocks are formed on the two opposite sides of the support frame by sintering, so that the plum blossom type silver powder sintered heat exchanger of this embodiment has a compact structure, and is very convenient to install and disassemble, and is very suitable for the arrangement and layout in the mixing chamber of a small refrigeration capacity dilution refrigerator.

[0017] The beneficial effects of the mixing chamber of the present invention are as follows: Since the mixing chamber has the aforementioned plum blossom-type silver powder sintered heat exchanger plate, the support frame with multiple through holes plays a good role in supporting the silver powder sintered block and strengthening heat conduction. Combined with the nano-sized porous structure of the silver powder sintered block, the dense phase or dilute phase of the helium-3-helium-4 mixed liquid has sufficient contact conditions with the large surface area of ​​the silver powder sintered block, thereby improving the heat exchange effect and heat exchange efficiency. In addition, by setting threaded holes on the support frame, the plum blossom-type silver powder sintered heat exchanger plate and the mounting column are installed by screwing in the thread. On the one hand, it can ensure the connection stability between the plum blossom-type silver powder sintered heat exchanger plate and the mounting column, and ensure the heat exchange effect of the plum blossom-type silver powder sintered heat exchanger plate. On the other hand, it facilitates the installation and disassembly of the plum blossom-type silver powder sintered heat exchanger plate, making the replacement and maintenance operations more convenient, which is very suitable for small refrigeration capacity dilution refrigerators.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 2 is a schematic structural diagram of a plum blossom type silver powder sintered heat exchanger sheet according to an embodiment of the present invention;

[0020] Figure 2 is a cross-sectional view of a plum blossom type silver powder sintered heat exchanger sheet according to an embodiment of the present invention;

[0021] Figure 3 1. It is a schematic structural diagram of a support frame of a plum blossom type silver powder sintered heat exchanger sheet according to an embodiment of the present invention;

[0022] Figure 4 is a schematic structural diagram of a mixing chamber according to an embodiment of the present invention;

[0023] Figure 5 Schematic diagram of an exploded view of a mixing chamber according to an embodiment of the present invention.

[0024] Reference numerals:

[0025] 100, plum blossom type silver powder sintered heat exchanger; 110, support frame; 111, through hole; 112, threaded hole; 120, silver powder sintered block;

[0026] 200, housing; 210, top plate; 211, first mounting groove; 212, dense phase liquid inlet; 213, dilute phase liquid outlet; 220, bottom plate; 221, mounting column; 222, second mounting groove; 230, side wall tube;

[0027] 300. Nut. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 or an electrical connection; 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 specific circumstances.

[0030] In the description of this embodiment, the terms "upper", "lower", and other positions or positional relationships are based on the positions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0031] Reference below Figure 1-Figure 3 The specific structure of the plum blossom type silver powder sintered heat exchange plate 100 according to the embodiment of the present invention is described.

[0032] The present invention discloses a plum blossom type silver powder sintered heat exchanger plate 100, referring to Figure 1-Figure 3As shown, the plum blossom type silver powder sintered heat exchanger fin 100 includes a support frame 110 and a silver powder sintered block 120. The support frame 110 is provided with a threaded hole 112 and a plurality of through holes 111 arranged around the threaded hole 112. The threaded hole 112 is used to cooperate with the mounting column 221 of the mixing chamber. The silver powder sintered block 120 is formed on two opposite sides of the support frame 110 by sintering. The silver powder sintered block 120 has a connection portion filled in the through hole 111. It can be understood that due to the large contact thermal resistance between the liquid and the metal surface under ultra-low temperature conditions, the heat exchange effect becomes very poor. In this way, effective heat exchange can only be achieved by relying on a large area of ​​silver powder sintering contact area. Generally, the silver powder sintered block 120 is relatively brittle, easy to break, and not easy to arrange evenly. In this embodiment, the support frame 110 with multiple through holes 111 plays a good role in supporting the silver powder sintered block 120 and strengthening heat conduction. Combined with the nano-sized porous structure of the silver powder sintered block 120, the dense phase or dilute phase helium-3-helium-4 mixed liquid has sufficient contact conditions with the large surface area of ​​the silver powder sintered block 120, thereby improving the heat exchange effect and heat exchange efficiency. In addition, the threaded holes 112 on the support frame 110 are used to cooperate with the mounting posts 221 of the mixing chamber. The silver powder sintered block 120 is formed on two opposite sides of the support frame 110 by sintering, so that the plum blossom type silver powder sintered heat exchange plate 100 of this embodiment has a compact structure, and is very convenient to install and disassemble, and is very suitable for the arrangement and layout in the mixing chamber of a small refrigeration capacity dilution refrigerator.

[0033] In addition, during the actual heat exchange process, if the connection between the plum blossom type silver powder sintered heat exchanger plate 100 and the mounting column 221 is unstable, it will affect the actual heat exchange effect. In this embodiment, by setting a threaded hole 112 on the support frame 110, the plum blossom type silver powder sintered heat exchanger plate 100 and the mounting column 221 are installed by screwing in. On the one hand, it can ensure the connection stability between the plum blossom type silver powder sintered heat exchanger plate 100 and the mounting column 221, and ensure the heat exchange effect of the plum blossom type silver powder sintered heat exchanger plate 100. On the other hand, it facilitates the installation and disassembly of the plum blossom type silver powder sintered heat exchanger plate 100, making replacement and maintenance operations more convenient.

[0034] It should be noted that the plum blossom type silver powder sintered heat exchanger 100 of this embodiment can be installed in the mixing chamber of 50μW and 100μW ultra-dilution cryogenic refrigerators respectively, and the plum blossom type silver powder sintered heat exchanger 100 provides a strong guarantee for the reliable operation of the dilution refrigerator. During the entire operation process of the refrigerator, the performance is reliable, which plays an important role in the normal operation of the core components of the ultra-low temperature dilution refrigerator.

[0035] Optional, reference Figure 3As shown, a plurality of through holes 111 are evenly spaced and distributed along the circumference of the threaded hole 112. It is understandable that the even distribution of the through holes 111 can make the silver powder sintered block 120 better combined with the support frame 110, thereby improving the structural reliability of the plum blossom type silver powder sintered heat exchanger 100. Further optionally, the number of through holes 111 in this embodiment is six. Of course, in the embodiment of the present invention, the number of through holes 111 can be two, three, four, five, seven or more, which can be selected according to the actual size of the support frame 110 and the heat exchange requirements.

[0036] Optionally, the support frame 110 is a copper frame. It is understandable that metal copper has a good thermal conductivity. The support frame 110 is a copper frame, which can enhance the heat conduction of the support frame 110, thereby facilitating the improvement of the heat exchange effect and heat exchange efficiency of the plum blossom type silver powder sintered heat exchanger 100. Of course, in other embodiments of the present invention, the material of the support frame 110 can also be selected from other metals with good thermal conductivity, and is not limited to the copper frame.

[0037] Optionally, the through hole 111 is a circular hole. It is understandable that in the actual manufacturing process, the circular hole can be directly manufactured by stamping or the like, which is very convenient to manufacture and helps to simplify the manufacturing process of the support frame 110, thereby reducing the manufacturing cost of the support frame 110. Of course, in other embodiments of the present invention, the shape of the through hole 111 can also be adjusted according to actual needs, and can be other shapes such as a square, and is not limited to the circular hole of the present embodiment.

[0038] Reference below Figure 4 and Figure 5 The specific structure of the mixing chamber according to the embodiment of the present invention is described.

[0039] The present invention also discloses a mixing chamber, referring to Figure 4 and Figure 5 As shown, the mixing chamber of this embodiment includes a housing 200 and the aforementioned plum blossom-type silver powder sintered heat exchanger fin 100, and the plum blossom-type silver powder sintered heat exchanger fin 100 is installed on the mounting column 221 in the housing 200. Since the mixing chamber of this embodiment has the aforementioned plum blossom-type silver powder sintered heat exchanger fin 100, the support frame 110 with multiple through holes 111 plays a good role in supporting the silver powder sintered block 120 and enhancing heat conduction. Combined with the nano-sized porous structure of the silver powder sintered block 120, the dense phase or dilute phase of the helium-3-helium-4 mixed liquid has sufficient contact conditions with the large surface area of ​​the silver powder sintered block 120, thereby improving the heat exchange effect and heat exchange efficiency. Since the plum blossom-type silver powder sintered heat exchanger fin 100 has a simple structure and is easy to install and disassemble, the structure of the mixing chamber is also very compact and easy to maintain, which is very suitable for small refrigeration capacity dilution refrigerators.

[0040] refer to Figure 4and Figure 5 As shown, a nut 300 for pressing the plum blossom type silver powder sintered heat exchanger fin 100 is provided at the top of the mounting column 221. It can be understood that by pressing the plum blossom type silver powder sintered heat exchanger fin 100 with the nut 300, its installation stability can be ensured, thereby ensuring the heat exchange efficiency.

[0041] refer to Figure 4 and Figure 5 As shown, the housing 200 includes a top plate 210, a bottom plate 220 and a side wall tube 230, the top plate 210 and the bottom plate 220 are arranged at intervals, a dense phase liquid inlet 212 and a dilute phase liquid outlet 213 are provided on the top plate 210, a cold plate is provided below the bottom plate 220, and both ends of the side wall tube 230 are connected to the top plate 210 and the bottom plate 220 respectively, and a mounting column 221 is provided on the bottom plate 220, and the mounting column 221 is used to cooperate with the threaded hole 112 of the plum blossom type silver powder sintered heat exchanger 100. It can be understood that the housing 200 includes the top plate 210, the bottom plate 220 and the side wall tube 230 for easy manufacturing and assembly. In the actual assembly process, the plum blossom type silver powder sintered heat exchanger 100 can be first installed on the mounting column 221 on the bottom plate 220, and then the side wall tube 230 and the top plate 210 can be installed in sequence. The top plate 210 is provided with a dense phase liquid inlet 212 and a dilute phase liquid outlet 213 to facilitate the inflow and outflow of liquid, thereby achieving heat exchange between the helium-3 / helium-4 mixed liquid and the plum blossom type silver powder sintered heat exchange plate 100 .

[0042] refer to Figure 4 and Figure 5 As shown, there are multiple plum blossom-type silver powder sintered heat exchanger sheets 100, and the multiple plum blossom-type silver powder sintered heat exchanger sheets 100 are arranged in sequence from top to bottom along the axial direction of the mounting column 221. In the actual working process, the number of plum blossom-type silver powder sintered heat exchanger sheets 100 can be increased or decreased according to the capacity of the mixing chamber to ensure the optimal heat exchange effect. In this embodiment, the number of plum blossom-type silver powder sintered heat exchanger sheets 100 is two. Of course, in other embodiments of the present invention, the number of plum blossom-type silver powder sintered heat exchanger sheets 100 can also be multiple. Optionally, the support frames 110 of two adjacent plum blossom-type silver powder sintered heat exchanger sheets 100 are abutted, which is conducive to improving the heat exchange effect.

[0043] Optionally, the top plate 210 is provided with a first mounting groove 211 that matches the upper end of the side wall tube 230, and the bottom plate 220 is provided with a second mounting groove 222 that matches the lower end of the side wall tube 230. It can be understood that by providing the first mounting groove 211 and the second mounting groove 222, positioning can be achieved when installing the side wall tube 230, and the connection sealing of the top plate 210 and the side wall tube 230, as well as the connection sealing of the bottom plate 220 and the side wall tube 230 can be improved, thereby ensuring the connection sealing of the entire mixing chamber.

[0044] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0045] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A plum blossom type silver powder sintered heat exchanger plate, characterized in that: include: A support frame (110), wherein the support frame (110) is provided with a threaded hole (112) and a plurality of through holes (111) arranged around the threaded hole (112), wherein the threaded hole (112) is used to cooperate with a mounting column (221) of a mixing chamber; A silver powder sintered block (120) is formed by sintering on two oppositely disposed surfaces of the support frame (110), and the silver powder sintered block (120) has a connecting portion filled in the through hole (111).

2. The plum blossom type silver powder sintered heat exchanger sheet according to claim 1, characterized in that: The plurality of through holes (111) are evenly spaced and distributed along the circumference of the threaded hole (112).

3. The plum blossom type silver powder sintered heat exchanger according to claim 1, characterized in that: The supporting frame (110) is a copper frame.

4. The plum blossom type silver powder sintered heat exchanger according to claim 1, characterized in that: The through hole (111) is a circular hole.

5. A mixing chamber, characterized in that: It comprises a shell (200) and at least one quincunx-shaped silver powder sintered heat exchanger plate according to any one of claims 1 to 4, wherein the quincunx-shaped silver powder sintered heat exchanger plate is installed on a mounting column (221) in the shell (200).

6. The mixing chamber according to claim 5, characterized in that A nut (300) for pressing the plum blossom type silver powder sintered heat exchange plate is arranged at the top of the installation column (221).

7. The mixing chamber according to claim 5, characterized in that The housing (200) comprises a top plate (210), a bottom plate (220) and a side wall tube (230); the top plate (210) and the bottom plate (220) are arranged at intervals; two ends of the side wall tube (230) are respectively connected to the top plate (210) and the bottom plate (220); a mounting column (221) is provided on the bottom plate (220); the mounting column (221) is used to cooperate with the threaded hole (112) of the plum blossom type silver powder sintered heat exchange plate.

8. The mixing chamber according to claim 7, characterized in that The top plate (210) is provided with a first mounting groove (211) that matches the upper end of the side wall tube (230).

9. The mixing chamber according to claim 7, characterized in that The bottom plate (220) is provided with a second mounting groove (222) that matches the lower end of the side wall tube (230).

10. The mixing chamber according to claim 5, characterized in that There are a plurality of the plum blossom-shaped silver powder sintered heat exchanger sheets, and the plurality of the plum blossom-shaped silver powder sintered heat exchanger sheets are arranged in sequence from top to bottom along the axial direction of the mounting column (221).

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