Pulsating heat pipe end connection structure

Abstract

The application discloses a pulsating heat pipe end connecting structure, which comprises a micro-channel parallel pipe, a joint and a plurality of connecting pipes. The connecting structure is formed by connecting the micro-channel parallel pipe head to tail through the connecting pipes, and the connecting pipes are arranged in the micro-channel parallel pipe. The two pipe openings of the micro-channel parallel pipe which are not connected internally are connected to the joint through the connecting pipes. The connecting pipes and the micro-channel parallel pipe and the connecting pipes and the joint are sealed by welding or cementing. The joint is provided with a process hole for vacuumizing and filling working medium. The process hole needs to be sealed after the filling is completed. The design has low processing cost and is convenient for large-scale production and industrialization of the pulsating heat pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heat sink, in particular to a pulsating heat pipe end connecting structure. BACKGROUND

[0002] Pulsating heat pipe is a commonly used pipe type, patent CN203148276U describes a parallel flow pulsating heat pipe, which adopts a snake type arrangement, but the patent does not give a detailed description of the interface of the pulsating heat pipe, which leads to difficulties in actual production and is not convenient for large-scale production of pulsating heat pipes. SUMMARY

[0003] To solve the above problems, the present application provides a pulsating heat pipe end connecting structure.

[0004] According to one aspect of the present application, a pulsating heat pipe end connecting structure is provided, characterized in that the connecting structure comprises a microchannel parallel pipe, a joint and a plurality of connecting pipes. The microchannel parallel pipe is bent to be opposite at the ends, and the connecting structure is formed by placing the connecting pipes inside the microchannel parallel pipe, connecting the microchannel parallel pipe at the ends by interlacing, and connecting the two pipe openings on the side of the microchannel parallel pipe that is not connected inside by two connecting pipes and a joint. The connecting pipe and the microchannel parallel pipe and the joint are sealed by welding or gluing, and the joint has a process hole for vacuumizing and filling the heat pipe with working medium. After filling, the process hole needs to be sealed.

[0005] Preferably, the microchannel parallel pipe is bent into a snake shape, and the ends are opposite to each other with a gap between the end faces of 0.1 to 5 mm. The gap is sealed by welding or gluing when the connecting pipe and the microchannel parallel pipe are connected.

[0006] Preferably, the number of connecting pipes is at least 5, and the length of the connecting pipe is greater than the gap between the end faces of the microchannel. When the connecting pipe is placed, both ends exceed the gap between the end faces of the microchannel, and the excess length is greater than 1 mm. The longer length is beneficial to avoid the flow of solder or glue into the connecting pipe opening during the welding or gluing sealing process to form an obstruction.

[0007] Preferably, the material of the connecting pipe is different from that of the microchannel parallel pipe. The material of the microchannel parallel pipe is aluminum alloy, and the material of the connecting pipe is stainless steel or red copper. The selection of the material of the connecting pipe needs to consider that its melting point is higher than the curing temperature of the solder or thermosetting glue. The material of the connecting pipe can be selected to be non-wetting to the solder or glue material to reduce the probability of blockage caused by the sealing process.

[0008] Further, the pulsating heat pipe using the above-mentioned end connecting structure of the pulsating heat pipe is provided with fins between the walls of the micro-channel parallel pipe to form a pulsating heat pipe heat exchanger, one part of which is used for heat absorption as the evaporation section of the pulsating heat pipe, and one part of which is used for heat release as the condensation section of the pulsating heat pipe. The product can be used for energy heat recovery application, and can also be used for heat dissipation in an environment with air as the heat source.

[0009] Further, the pulsating heat pipe using the above-mentioned end connecting structure of the pulsating heat pipe is provided with fins between the walls of the micro-channel parallel pipe to form a pulsating heat pipe heat exchanger, one part of which is used for heat absorption as the evaporation section of the pulsating heat pipe, and one part of which is used for heat release as the condensation section of the pulsating heat pipe. The product can be used for energy heat recovery application, and can also be used for heat dissipation in an environment with air as the heat source.

[0010] The present application has the following advantages:

[0011] 1. The difficulty of butting the micro-channel parallel pipe is greatly reduced by pre-installing the connecting pipe inside the micro-channel parallel pipe;

[0012] 2. The sealing strength is increased by forming a sealing structure between the connecting pipe and the micro-channel parallel pipe through welding or cementing;

[0013] 3. The processing cost is low, and mass production and industrialization of the pulsating heat pipe are facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a front view of an end connecting structure of a pulsating heat pipe according to the present application;

[0015] Figure 2 is Figure 1 is a partial front view of an end connecting structure of a pulsating heat pipe according to the present application;

[0016] Figure 3 is Figure 2 is a partial end detail sectional view of an end connecting structure of a pulsating heat pipe according to the present application;

[0017] Figure 4 is Figure 1 is a front view of a heat radiator composed of an end connecting structure of a pulsating heat pipe according to the present application;

[0018] Figure 5 is Figure 1 is a front view of a heat exchanger composed of an end connecting structure of a pulsating heat pipe according to the present application.

[0019] In the figure: joint 1, multiple pipes 2, micro-channel parallel pipe 3, fin 4, metal block 5, sealing material 7. DETAILED DESCRIPTION

[0020] The present application will be further described in detail below with reference to the accompanying drawings.

[0021] As Figures 1 to 3 shown, the connection structure includes a micro-channel parallel pipe 3 with multiple parallel channels inside (16 in this embodiment), a joint 1, and multiple (17 in this embodiment) connecting pipes 2. The micro-channel parallel pipe 3 is bent into a serpentine shape with straight middle and curved ends by sheet metal bending technology, and the first and last end faces of the micro-channel parallel pipe 3 are placed opposite to each other with a distance of 0.1mm-5mm, preferably 1mm. The length of the connecting pipe 2 is greater than the gap between the end faces of the micro-channel parallel pipe 3

[0022] The connection structure has a part (15 in this embodiment) of the connecting pipes 2 pre-placed inside the micro-channel parallel pipe 3, with both ends inserted into the micro-channel parallel pipe 3 by 20mm and 30mm respectively, connected by staggering and connected to the first and last ends of the micro-channel parallel pipe 3 to form an internal series flow channel.

[0023] The two pipe openings on the side of the micro-channel parallel pipe 3 not connected internally are also connected to the joint 1 by two other connecting pipes 2, both of which are inserted into the micro-channel parallel pipe 3 by 30mm.

[0024] The connecting pipes and the micro-channel parallel pipe 3, as well as the connecting pipes 2 and the joint 1, are sealed by cementing, and a process hole is left in the joint, with an outer diameter of the process hole preferably 3mm-8mm.

[0025] This design uses 6mm aluminum pipes for vacuum pumping and filling of working medium, and the working medium can be ethanol, acetone, ammonia, fluorinated liquid, freon, etc. In this example, R134a is used. After filling, the process hole is sealed by cementing, and to ensure the strength and life of the cementing, the sealing material 7 completely covers all the connecting pipes 2.

[0026] The material of the connecting pipes 2 is stainless steel or red copper.

[0027] Figure 4 The heat sink shown is composed of the pulsating heat pipe connection structure of the present application. The heat sink includes the connection structure, multiple fins 4 and metal blocks 5. The heat collecting plate 5 is installed between the wall surfaces at one end of the micro-channel parallel pipe 3, and the fins 4 are installed between the wall surfaces at the other end of the micro-channel parallel pipe 3, forming a pulsating heat pipe heat sink.

[0028] The surface of the metal block 5 is grooved, and one end of the micro-channel parallel pipe 3 is placed in the groove of the metal block. To reduce the contact thermal resistance, the inner surface of the groove and the contact area between the outer surface of the micro-channel parallel pipe are coated with thermal conductive glue to reduce the contact thermal resistance. The fins 4 are used to increase the heat dissipation area.

[0029] Wherein, the pulsating heat pipe is divided into evaporation section for heat absorption and condensation section for heat release, one end of the heat collecting plate 5 is the evaporation section, and one end of the fin 4 is the condensation section.

[0030] Figure 5 The heat exchanger composed of the pulsating heat pipe connecting structure of the present application is shown in the schematic diagram, which includes the connecting structure and a plurality of fins 4. Each fin 4 is installed between the walls of the micro-channel parallel pipe 3 for increasing the heat dissipation area.

[0031] Wherein, one part of the heat exchanger passes through high-temperature air, which is called the evaporation section of the pulsating heat pipe, and the other part of the heat exchanger passes through low-temperature air, which is called the condensation section of the pulsating heat pipe, so as to realize heat exchange, which can be applied to the heat recovery system.

[0032] The above is only one type of the pulsating heat pipe end connecting structure and its application of the present application. For those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. A pulsed heat pipe end connection structure, characterized in that: It includes a microchannel parallel tube (3), a connector (1) and multiple connecting tubes (2). The microchannel parallel tube (3) is bent so that the ends are opposite each other. A portion of the connecting tubes (2) are pre-placed inside the microchannel parallel tube (3) and connected to both ends of the microchannel parallel tube (3) to form an internally connected flow channel. The two tube openings of the side of the microchannel parallel tube (3) that are not internally connected are also connected to the connector (1) through two other connecting tubes (2). The connecting tubes (2) and the microchannel parallel tube (3), as well as the connecting tubes (2) and the connector (1), are sealed by welding or gluing. The connector has a process hole.

2. The pulsating heat pipe end connection structure according to claim 1, characterized in that: The microchannel parallel tube (3) is bent into a serpentine shape, and its ends are aligned by bending.

3. The pulsating heat pipe end connection structure according to claim 2, characterized in that: The gap between each end face of the microchannel parallel tube (3) is 0.1mm-5mm.

4. The pulsating heat pipe end connection structure according to claim 1, characterized in that: The number of connecting tubes (2) is at least 5, and the length of the connecting tubes (2) is greater than the gap between the end faces of the microchannel parallel tubes (3).

5. The pulsating heat pipe end connection structure according to claim 1, characterized in that: The material of the microchannel parallel tube (3) is aluminum alloy.

6. The pulsating heat pipe end connection structure according to claim 1, characterized in that: The connecting pipe (2) is made of stainless steel or copper.

7. The pulsating heat pipe end connection structure according to any one of claims 1 to 6, characterized in that: A heat collection plate (5) is set between the walls at one end of the microchannel parallel tube (3), and fins (4) are set between the walls at the other end of the microchannel parallel tube (3) to form a pulsating heat pipe radiator, wherein the heat collection plate (5) is located in the evaporation section of the pulsating heat pipe, and the fins (4) are located in the condensation section of the pulsating heat pipe.

8. The pulsating heat pipe end connection structure according to any one of claims 1 to 6, characterized in that: Fins (4) are installed between the walls of the microchannel parallel tube (3) to form a pulsating heat pipe heat exchanger. One part of the microchannel parallel tube (3) is located in the evaporation section of the pulsating heat pipe, and the other part is located in the condensation section of the pulsating heat pipe.

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