Dividing wall type cold accumulation heat exchanger

Abstract

The dividing wall type cold accumulation heat exchanger comprises a heat exchanger core body, the heat exchanger core body comprises a metal shell and a plurality of micro-channel structures formed in the metal shell, the micro-channels are mutually independent, the micro-channels comprise cold fluid channels and hot fluid channels, and the cold fluid channels are communicated with the hot fluid channels. According to the dividing wall type cold storage heat exchanger, the compact countercurrent heat exchanger design is adopted, the structure of a traditional heat exchanger is optimized, and the dividing wall type cold storage heat exchanger has the larger heat exchange area and the higher heat transfer coefficient. Compared with a traditional heat exchanger, more efficient heat exchange can be achieved in a system intermittent flowing mode, and therefore the refrigerating efficiency of a pulse pipe (or piston) expansion type refrigerating machine is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a partition-type cold storage heat exchanger. Background Art

[0002] The pulse tube (or piston) expansion refrigerator is a refrigeration equipment that can achieve high reliability operation in a low temperature environment, and is particularly suitable for medium-sized cooling needs. The overall performance of the refrigerator depends not only on the efficiency of the expander, but also to a large extent on the efficient heat exchange capacity of the heat exchanger. Since the working process of the pulse tube (or piston) expander is intermittent and cyclic expansion and air intake, the flow of cold and hot fluids in the heat exchanger matched with it is also intermittent and cyclic, that is, the flow of cold and hot fluids will never occur in this heat exchanger at the same time. Therefore, if there is no cold storage (or heat storage) effect in this heat exchanger, heat exchange cannot be achieved between cold and hot fluids, and this situation becomes more and more obvious as the operating frequency of the expander decreases. The traditional partition wall heat exchanger has limited cold or heat storage capacity, resulting in unsatisfactory refrigeration efficiency.

[0003] In a pulse tube (or piston) expansion refrigerator, the role of the heat exchanger is to cool the high-pressure, normal-temperature fluid delivered by the compressor system water cooler, achieving a further drop in its temperature. At the same time, the airflow returning from the cold heat exchanger is effectively heated during the heat exchange process, causing its temperature to rise. As a result of this heat exchange process, the suction temperature of the compressor is increased, while the inlet temperature of the pulse tube (or piston) expansion refrigerator is reduced accordingly. This temperature regulation is crucial to improving the refrigeration efficiency of the pulse tube (or piston) expansion refrigerator based on the reverse Brayton cycle principle.

[0004] Therefore, as a key component in the refrigeration system, the performance of the heat exchanger is directly related to the refrigeration efficiency and operating stability of the entire refrigerator. Utility Model Content

[0005] In view of this, it is necessary to provide a partition-type cold storage heat exchanger with higher cooling efficiency to address the technical defects of the current traditional partition-type heat exchanger, which has limited cold or heat storage capacity and leads to unsatisfactory cooling efficiency.

[0006] In order to solve the above problems, the utility model adopts the following technical solutions:

[0007] One of the purposes of the utility model is to provide a partition-type cold storage heat exchanger, comprising: a heat exchanger core, the heat exchanger core comprising a metal shell and a plurality of microchannel structures formed in the metal shell, the microchannels being independent of each other, the microchannels comprising a cold fluid channel and a hot fluid channel, and the cold fluid channel and the hot fluid channel being arranged in a layered alternating manner.

[0008] In some embodiments, the microchannel includes but is not limited to a matrix or semi-elliptical structure.

[0009] In some embodiments, the microchannels are distributed in an array structure.

[0010] In some embodiments, the cold fluid channels and the hot fluid channels are arranged in alternating layers.

[0011] In some embodiments, the microchannels are straight channels and corrugated channels.

[0012] In some of the embodiments, the microchannel is formed in the metal shell using 3D printing technology.

[0013] In some embodiments, the metal shell includes but is not limited to stainless steel, copper, aluminum and alloys thereof.

[0014] In some embodiments, a low-temperature working fluid inlet pipe, a normal-temperature working fluid inlet pipe, a low-temperature working fluid outlet pipe and a normal-temperature working fluid outlet pipe are provided on the side wall of the metal shell. The low-temperature working fluid enters the heat exchanger core through the low-temperature working fluid inlet pipe and flows out through the low-temperature working fluid outlet pipe after heat exchange in the heat exchanger core. The normal-temperature working fluid enters through the normal-temperature working fluid inlet pipe and flows out through the normal-temperature working fluid outlet pipe.

[0015] In some embodiments, the low-temperature working fluid inlet pipe, the normal-temperature working fluid inlet pipe, the low-temperature working fluid outlet pipe and the normal-temperature working fluid outlet pipe are integrally formed on the side wall of the metal shell.

[0016] The utility model adopts the above technical solution, and its beneficial effects are as follows:

[0017] The partition-type cold storage heat exchanger provided by the utility model includes a heat exchanger core, the heat exchanger core includes a metal shell and a plurality of microchannel structures formed in the metal shell, the microchannels are independent of each other, the microchannels include cold fluid channels and hot fluid channels, and the cold fluid channels and hot fluid channels are arranged in a layered alternating manner. The partition-type cold storage heat exchanger provided by the utility model adopts a compact countercurrent heat exchanger design, optimizes the structure of the traditional heat exchanger, and has a larger heat exchange area and a higher heat transfer coefficient. Compared with the traditional heat exchanger, the utility model can achieve more efficient heat exchange in the system intermittent flow mode, thereby effectively improving the refrigeration efficiency of the pulse tube (or piston) expansion refrigerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments of the utility model or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic structural diagram of a partition-type cold storage heat exchanger provided in one embodiment of the utility model.

[0020] Figure 2 A schematic diagram of the core structure of a partition-type cold storage heat exchanger provided in one embodiment of the utility model.

[0021] Figure 3 A cross-sectional schematic diagram of the core structure of a partition-type cold storage heat exchanger provided in one embodiment of the utility model. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0023] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] See also Figure 1The embodiment of the utility model provides a partition-type cold storage heat exchanger, including: a heat exchanger core 100, wherein the heat exchanger core 100 includes a metal shell 110 and a plurality of microchannel structures 120 formed in the metal shell 110. The specific implementation of each structure is described in detail below.

[0027] Specifically, the microchannels 120 are independent of each other. The microchannels 120 include cold fluid channels and hot fluid channels, and the cold fluid channels and hot fluid channels are arranged in a layered alternating manner.

[0028] See also Figure 2 and Figure 3 , which is a schematic diagram of the structure of the heat exchanger core provided in this embodiment. In this embodiment, the microchannel 120 structure is composed of a number of neatly arranged rectangular microchannels processed on a metal block. The microchannels are independent of each other. The cross section of the heat exchanger is as follows: Figure 3 As shown, the channels marked as "c" represent cold fluid channels, while the channels marked as "h" represent hot fluid channels, and these channels are arranged in a layered alternating manner.

[0029] Furthermore, the heat exchanger core 100 provides two optional types of fluid channel structure design: a straight channel and a corrugated channel. The design of the corrugated channel is intended to further improve the heat exchange efficiency by enhancing the turbulence of the fluid flow.

[0030] It can be understood that the heat exchanger core 100 of the partition-type cold storage heat exchanger provided in this embodiment is composed of rectangular microchannels, the microchannels are independent of each other, and the cold runners and hot runners are arranged alternately in layers. According to different application requirements, straight channels or corrugated channel structures can be selected to adapt to different fluid characteristics and system design requirements.

[0031] Furthermore, the microchannel 120 is formed in the metal shell by 3D printing technology. It can be understood that the microchannel 120 is formed in the metal shell 110 by 3D printing technology, which ensures the accuracy of the flow channel structure and the realization of complex design. It can also select materials with different thermophysical parameters for customized processing as a whole or in sections according to the requirements of different temperature zones of the heat exchanger.

[0032] Furthermore, the metal shell 110 includes but is not limited to stainless steel, copper, aluminum and alloys thereof.

[0033] It should be noted that the selection of the material of the metal shell 110 of the partition-type cold storage heat exchanger provided in this embodiment and the design of the structural dimensions need to be based on the operating temperature and pressure range of the heat exchanger, the flow rate of the fluid and the operating frequency of the system, and a metal material with appropriate thermal conductivity, heat capacity and mechanical strength should be selected. In practice, the optional materials include but are not limited to stainless steel, copper, aluminum and its alloys.

[0034] It can be understood that the partition-type cold storage heat exchanger provided by the utility model adopts a compact countercurrent heat exchanger design, which effectively increases the heat exchange area and improves the heat transfer efficiency. At the same time, it utilizes the metal wall with a larger heat capacity to store cold or heat, thereby improving the performance of the refrigerator in the intermittent working mode.

[0035] Furthermore, a low-temperature working fluid inlet pipe 111, a normal-temperature working fluid inlet pipe 112, a low-temperature working fluid outlet pipe 113 and a normal-temperature working fluid outlet pipe 114 are provided on the side wall of the metal shell 110. The low-temperature working fluid enters the heat exchanger core 100 through the low-temperature working fluid inlet pipe 111 and flows out through the low-temperature working fluid outlet pipe 113 after heat exchange in the heat exchanger core. The normal-temperature working fluid enters through the normal-temperature working fluid inlet pipe 112 and flows out through the normal-temperature working fluid outlet pipe 114.

[0036] Furthermore, the low-temperature working medium inlet pipe 111 , the normal-temperature working medium inlet pipe 112 , the low-temperature working medium outlet pipe 113 and the normal-temperature working medium outlet pipe 114 are integrally formed on the side wall of the metal shell 110 .

[0037] It can be understood that for applications with large temperature differences between the hot and cold ends, materials with different thermophysical parameters are used for segmented design and processing according to the temperature gradient in the heat exchanger. Thermal matching between segments is achieved by precisely controlling the thermal expansion coefficient and thermal conductivity of the material.

[0038] The partition-type cold storage heat exchanger provided by the utility model adopts a compact countercurrent heat exchanger design, optimizes the structure of the traditional heat exchanger, and makes it have a larger heat exchange area and a higher heat transfer coefficient. Compared with the traditional heat exchanger, the utility model can achieve more efficient heat exchange in the system intermittent flow mode, thereby effectively improving the refrigeration efficiency of the pulse tube (or piston) expansion refrigerator.

[0039] It can be understood that the technical features of the above-described embodiments can be arbitrarily combined. In order to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for the purpose of explaining the principles of the present invention, and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanation here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementation methods of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. A partition-type cold storage heat exchanger, characterized in that: include: The heat exchanger core comprises a metal shell and a plurality of microchannel structures formed in the metal shell, wherein the microchannels are independent of each other, the microchannels comprise cold fluid channels and hot fluid channels, and the cold fluid channels and hot fluid channels are arranged in a layered alternating manner.

2. The partition-type cold storage heat exchanger according to claim 1, characterized in that: The microchannels include, but are not limited to, matrix or semi-elliptical structures.

3. The partition-type cold storage heat exchanger according to claim 2, characterized in that: The microchannels are distributed in an array structure.

4. The partition-type cold storage heat exchanger according to claim 3, characterized in that: The cold fluid channels and the hot fluid channels are arranged in a layered alternating manner.

5. The partition-type cold storage heat exchanger according to claim 1, characterized in that: The microchannels are straight channels and corrugated channels.

6. The partition-type cold storage heat exchanger according to claim 1, characterized in that: The microchannel is formed in the metal shell by using 3D printing technology.

7. The partition-type cold storage heat exchanger according to claim 1, characterized in that: The metal shell includes but is not limited to stainless steel, copper, aluminum and alloys thereof.

8. The partition-type cold storage heat exchanger according to claim 1, characterized in that: A low-temperature working fluid inlet pipe, a normal-temperature working fluid inlet pipe, a low-temperature working fluid outlet pipe and a normal-temperature working fluid outlet pipe are arranged on the side wall of the metal shell. The low-temperature working fluid enters the heat exchanger core through the low-temperature working fluid inlet pipe and flows out through the low-temperature working fluid outlet pipe after heat exchange in the heat exchanger core. The normal-temperature working fluid enters through the normal-temperature working fluid inlet pipe and flows out through the normal-temperature working fluid outlet pipe.

9. The partition-type cold storage heat exchanger according to claim 8, characterized in that: The low-temperature working medium inlet pipe, the normal-temperature working medium inlet pipe, the low-temperature working medium outlet pipe and the normal-temperature working medium outlet pipe are integrally formed on the side wall of the metal shell.

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