Power combiner with closed inner cavity for circulating cooling

Abstract

The utility model relates to a power combiner with a closed inner cavity for circulating cooling, which comprises a main shell for installing a power synthesis substrate, partition plates are symmetrically arranged in the inner shell cavity of the main shell so as to divide a gap layer cavity and an installation inner cavity, and the gap layer cavity is divided into a plurality of parallel heat transfer runners through a plurality of vertical plates which are arranged at intervals; a plurality of heat transfer units capable of transferring heat in the mounting inner cavity are inlaid in the partition plate in an array mode, a connecting pipeline communicating with a heat transfer runner of an internal component of the gap layer cavity is further arranged on the cavity wall, away from the mounting inner cavity, of the gap layer cavity in a penetrating mode, and the connecting pipeline is further connected with a heat dissipation assembly; therefore, the connecting pipeline, the heat dissipation assembly and the heat transfer flow channel in the gap layer cavity are sequentially communicated to form a circulating cooling loop. According to the utility model, heat generated in the power combiner can be efficiently and actively transferred, and meanwhile, internal elements are prevented from being corroded by external water vapor, so that the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of power synthesizers, in particular to a power synthesizer with a closed inner cavity and circulating cooling. Background Art

[0002] With the rapid development of microwave technology in the fields of radar and communication, the requirements for high-efficiency power amplifiers are getting higher and higher. Low insertion loss, high power, and large bandwidth synthesizers are the core of power synthesis technology, which is crucial for microwave communications, electronic countermeasures, and aerospace measurement and control equipment in the current high-power field. In the case of limited output power of a single solid-state power amplifier chip, power synthesis technology is generally used to increase the output power of the transmitter. Various forms of power synthesis structures have emerged. In recent years, quasi-optical and spatial power synthesis technologies with high efficiency and high power have gradually become a research hotspot. The size and loss of the power synthesizer directly determine the size and efficiency of the power amplifier. At present, most of them use planar power synthesis. With the increase of the number of synthesis paths, the volume becomes very large, and the power loss also increases, which greatly reduces the synthesis efficiency.

[0003] When the existing power combiner products are used, the power combiner will inevitably have return loss at the signal input port, which is caused by the signal output port reflecting part of the energy back to the signal input port. The power combiner is prone to have a large difference in return loss at each signal input port, which causes uneven input power of each channel and even causes local overheating. Most of the existing power combiners lack a heat dissipation cooling structure, and they cannot cool down the overheated area inside. Although some products improve the heat dissipation and ventilation effect by opening a number of air holes on the shell, this through-type structure cannot protect the power synthesis substrate inside the shell. It is very easy for dust and other impurities to adhere to the surface of the power synthesis substrate, which hinders the heat dissipation of its surface and causes its heat dissipation effect to seriously decline after long-term use. In addition, the through-type air holes mainly realize heat transfer by natural diffusion of heat, and its heat dissipation and cooling efficiency is low. It is also very easy to introduce water vapor and other substances into the shell to corrode the power synthesis substrate, which greatly reduces the life of the internal components of the power combiner and shortens the service life of the power combiner. Utility Model Content

[0004] The utility model aims to provide a power combiner with closed inner cavity circulation cooling, which can effectively and actively transfer the heat generated inside the power combiner while ensuring the construction of a closed inner cavity environment, while preventing the internal components from being corroded by external water vapor and thus prolonging the service life, so as to solve the problems that the existing power combiner does not have a good heat dissipation structure, the heat dissipation effect of continuous operation is poor, and the internal components of the power combiner provided with cooling and heat dissipation structures such as air holes will be corroded by external water vapor and be hindered by floating dust, resulting in low heat dissipation efficiency and seriously reduced service life.

[0005] The technical solution adopted by the utility model is: a power synthesizer with closed inner cavity circulation cooling, including a main shell body on which a power synthesis substrate is installed, partitions are symmetrically arranged in the inner shell cavity of the main shell body to separate a gap layer cavity and an installation cavity, and the gap layer cavity is divided into a plurality of parallel heat transfer channels by a plurality of vertical plates arranged at intervals; a plurality of heat transfer units capable of transferring heat in the installation cavity are inlaid in an array on the partition body, and a connecting pipeline connected to the heat transfer channel of its internal components is also penetrated on the cavity wall of the gap layer cavity away from the installation cavity, and the connecting pipeline is also connected to a heat dissipation component, so that the connecting pipeline, the heat dissipation component and the heat transfer channel in the gap layer cavity are connected in sequence to form a circulating cooling circuit.

[0006] According to a preferred embodiment, the connecting pipeline includes an inlet main pipe, an inlet branch pipe, an outlet main pipe and a connecting pipe, wherein the connecting pipe, the inlet main pipe and the inlet branch pipe are connected in sequence, and the input end of the connecting pipe is connected to the output end of the heat dissipation component, and the output ends of multiple parallel inlet branch pipes are inserted into the gap layer cavity and are respectively connected to the parallel heat transfer flow channels; the inlet branch pipes are arranged at intervals on the side wall of the pipe body of the inlet main pipe to divert the heat transfer liquid that flows directionally in the inlet main pipe.

[0007] According to a preferred embodiment, an axial liquid pump for controlling the flow rate of the heat transfer fluid in the circulating cooling circuit constructed by the connecting pipeline, the heat dissipation component and the heat transfer channel and a one-way valve for limiting the one-way flow of the heat transfer fluid are arranged in the connecting pipe.

[0008] According to a preferred embodiment, the heat dissipation assembly includes a first heat dissipation branch pipe, a heat dissipation pipe, a heat sink, a heat dissipation fan, a support frame, a second heat dissipation branch pipe and a manifold, wherein the branch outlet of the first heat dissipation branch pipe corresponding to the heat transfer channel is connected to the input end of several parallel heat dissipation pipes, and the output end of the heat dissipation pipe is connected to the input end of the second heat dissipation branch pipe, and multiple mutually parallel second heat dissipation branch pipes corresponding to different heat transfer channels are all connected to the same manifold.

[0009] According to a preferred embodiment, the input end of the first heat dissipation branch pipe is connected to the output end of the inlet branch pipe, and the plurality of heat dissipation pipes arranged side by side are supported on the outside of the main shell in parallel with the shell wall of the main shell; the output end of the manifold is connected to the input end of the connecting pipe.

[0010] According to a preferred embodiment, a plurality of heat sinks are arranged at intervals on the surface of the heat pipe away from the main shell; the support frame is supported on the outer shell wall of the main shell, and a plurality of heat sink fans are installed in an array on the installation plane defined by the support frame.

[0011] According to a preferred embodiment, the heat absorbing end surface of the heat transfer unit embedded in the installation cavity is also provided with a heat conductive protective shell.

[0012] According to a preferred embodiment, flow limiting blocks are arranged at intervals on the inner wall of the main shell away from the partition plate in a manner of defining a periodically undulating variable-diameter flow channel.

[0013] According to a preferred embodiment, the inner wall of the main shell between adjacent current limiting blocks is further provided with diverter columns corresponding to the heat transfer units in an array, and two adjacent rows of diverter columns are staggered.

[0014] According to a preferred embodiment, a mounting plate is detachably provided in the mounting inner cavity, and an array of mounting through holes for detachably mounting a power synthesis substrate and dissipating heat is provided on the plate body of the mounting plate; a heat-insulating partition plate is also provided on the outer surface of the main shell facing the heat dissipation pipe.

[0015] The beneficial effects of the utility model are:

[0016] The heat transfer unit provided in the present application can transfer the heat existing in the installation inner cavity of the main shell in the sealed chamber environment outward by being embedded in the cavity wall, so as to ensure the separation state of the installation inner cavity from the outside world while completing effective heat transfer. The present application realizes the continuous outward transfer of heat in the closed chamber by constructing a heat transfer flow channel at the heat dissipation end of the heat transfer unit and a connecting pipeline and a heat dissipation component that constitute a circulating cooling loop with the heat transfer flow channel, and its active transfer working mode can greatly improve the heat transfer efficiency while ensuring the closure of the chamber, thereby avoiding the deposition of impurities such as floating dust on the surface of functional elements such as substrates, ensuring the high efficiency of long-term continuous heat dissipation, and the closed chamber can also avoid the erosion of functional elements by external water vapor, thereby ensuring that the service life of the functional elements and the synthesis efficiency of the entire life cycle are greatly improved while ensuring the appropriate working temperature. The circulating cooling loop constructed in the present application can continuously transfer the heat transferred by the heat transfer unit for a second time, and the connecting pipeline can drive the heat transfer fluid to flow in a directional manner with an adjustable flow rate to adjust the heat transfer capacity of the circulating cooling loop according to demand. The heat dissipation assembly provided in the present application can efficiently transfer heat outward by means of diversion to increase the heat dissipation area, active heat diffusion and passive airflow entrainment, thereby ensuring the effectiveness of heat transfer in the circulating cooling loop, improving the life of the internal components of the power combiner, and extending the service life of the power combiner. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a preferred closed inner cavity circulating cooling power combiner proposed by the utility model;

[0018] Figure 2 It is a schematic diagram of the lateral structure of a part of the main housing of a power combiner with a preferred closed inner cavity circulation cooling proposed by the utility model.

[0019] Reference numerals list

[0020] 1: Main shell; 2: Heat transfer unit; 3: Connecting pipeline; 4: Heat dissipation assembly; 11: Partition plate; 12: Gap layer cavity; 13: Mounting inner cavity; 14: Vertical plate; 15: Mounting plate; 16: Current limiting block; 17: Diverter column; 18: Divider plate; 151: Mounting through hole; 21: Heat conductive protective shell; 31: Inlet main pipe; 32: Inlet branch pipe; 33: Outlet main pipe; 34: Connecting pipe; 41: First heat dissipation branch pipe; 42: Heat dissipation pipe; 43: Heat sink; 44: Heat dissipation fan; 45: Support frame; 46: Second heat dissipation branch pipe; 47: Converging pipe; 341: Axial liquid pump; 342: One-way valve. DETAILED DESCRIPTION

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the utility model will be briefly introduced below in combination with the drawings and the descriptions of the embodiments or the prior art. Obviously, the following descriptions of the structures of the drawings 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.

[0022] The technical solution provided by the present invention will be described in detail below by way of examples with reference to the accompanying drawings. It should be noted that the description of these examples is used to help understand the present invention, but does not constitute a limitation of the present invention. In some examples, some implementation methods are not described or are not described in detail because they belong to existing or conventional technologies.

[0023] In addition, the technical features described herein, or the steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can also be combined in any suitable manner in one or more embodiments. For those skilled in the art, it is easy to understand that the steps or operation sequence of the methods related to the embodiments provided herein can also be changed. Any order in the drawings and embodiments is only for illustrative purposes and does not imply a requirement to follow a certain order unless it is explicitly stated that a certain order is required.

[0024] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, under reasonable circumstances (not constituting a self-contradiction), include direct and indirect connections (couplings).

[0025] The following is a detailed description with reference to the accompanying drawings.

[0026] Example 1

[0027] The present application provides a power combiner with closed inner cavity circulation cooling, which includes a main housing 1, a heat transfer unit 2, a connecting pipeline 3 and a heat dissipation component 4.

[0028] according to Figure 1-2In a specific embodiment shown, a power synthesis substrate is detachably installed in the main housing 1. The heat transfer unit 2 is detachably embedded in the channel wall of the heat transfer channel separated in the main housing 1. The heat transfer unit 2 is connected to the connecting pipe 3 that runs through the shell wall of the main housing 1 through the heat transfer channel defined by the main housing 1. The ports of the connecting pipe 3 on the outside of the main housing 1 are connected to the two ends of the heat dissipation pipeline defined by the heat dissipation component 4, so that the two ends of the heat transfer channel are connected end to end with the heat dissipation component 4 through the connecting pipe 3 to construct a circulating cooling loop. The heat transfer unit 2 transfers the heat generated by the power synthesis substrate in the main housing 1 to the heat transfer channel, so that the heat-conducting fluid entrained with heat in the heat transfer channel is transferred to the heat dissipation component 4 through the connecting pipe 3, thereby realizing continuous and efficient active heat transfer of the heat transfer unit 2 to effectively reduce the working temperature of the power synthesis substrate. The heat transfer unit 2 provided in the present application can transfer the heat existing in the installation inner cavity 13 of the main shell 1 in the sealed chamber environment outward by being embedded in the cavity wall, so as to ensure that the installation inner cavity 13 is separated from the outside and complete effective heat transfer at the same time. The present application realizes the continuous outward transfer of heat in the closed chamber by constructing a heat transfer flow channel at the heat dissipation end of the heat transfer unit 2 and a connecting pipe 3 and a heat dissipation component 4 that form a circulating cooling loop with the heat transfer flow channel, and its active transfer working mode can greatly improve the heat transfer efficiency while ensuring the closure of the chamber, thereby avoiding the deposition of impurities such as floating dust on the surface of functional elements such as substrates, ensuring the high efficiency of long-term continuous heat dissipation, and the closed chamber can also avoid the erosion of functional elements by external water vapor, thereby ensuring that the working temperature is suitable, greatly improving the service life of the functional elements and the synthesis efficiency in the entire life cycle. The circulating cooling loop constructed in the present application can continuously transfer the heat transferred by the heat transfer unit 2 for a second time, and the connecting pipe 3 can drive the heat transfer fluid to flow in a directional manner with an adjustable flow rate to adjust the heat transfer capacity of the circulating cooling loop according to demand. The heat dissipation component 4 provided in the present application can efficiently transfer heat outward by means of diversion to increase the heat dissipation area, active heat diffusion and passive airflow entrainment, thereby ensuring the effectiveness of heat transfer in the circulating cooling loop, improving the life of the internal components of the power combiner, and extending the service life of the power combiner.

[0029] Preferably, a partition 11 is symmetrically arranged in the inner shell cavity of the main shell 1 to separate the gap layer cavity 12 and the installation cavity 13. Preferably, the gap layer cavity 12 is divided into a plurality of parallel heat transfer channels by a plurality of vertical plates 14 arranged at intervals. Preferably, a plurality of heat transfer units 2 capable of transferring heat in the installation cavity 13 are arrayed and inlaid on the partition 12. Preferably, a connecting pipeline 3 communicating with the heat transfer channel of its internal components is also penetrated on the cavity wall of the gap layer cavity 12 away from the installation cavity 13. Preferably, the connecting pipeline 3 is also connected to a heat dissipation component 4, so that the connecting pipeline 3, the heat dissipation component 4 and the heat transfer channel in the gap layer cavity 12 are sequentially connected to form a circulating cooling circuit. Preferably, a mounting plate 15 can also be detachably arranged in the installation cavity 13. Preferably, an array of mounting through holes 151 is provided on the plate body of the mounting plate 15, which can detachably mount the power synthesis substrate and can dissipate heat. Preferably, flow limiting blocks 16 are arranged at intervals on the inner wall of the main shell 1 away from the partition 11 in a manner of defining a periodically undulating variable diameter flow channel. Preferably, diverter columns 17 corresponding to the heat transfer units 2 are also arranged in an array on the inner wall of the main shell 1 between adjacent flow limiting blocks 16, and two adjacent rows of diverter columns 17 are staggered. Preferably, a heat-insulating partition plate 18 is also provided on the outer surface of the main shell 1 facing the heat dissipation pipe 42. The present application defines a plurality of parallel heat transfer channels by providing a partition 11 and a vertical plate 14, so that the heat transfer fluid can more effectively absorb heat and flow in the separated channels, and a plurality of heat transfer units 2 are arranged at intervals on the channel wall of the same heat transfer channel to ensure the heat transfer effect. The present application sets a distributing column 17 arranged in a staggered array in the heat transfer flow channel to continuously change the flow state of the heat transfer liquid flow, so that the heat transfer liquid flow can change the distribution of the heat absorbed during the continuous separation and combination process, so that the heat transfer liquid flow that absorbs heat or absorbs less heat can more effectively and fully absorb the heat transferred by the heat transfer unit 2. The present application also sets a flow limiting block 16 with an arc-shaped cross-section to change the flow velocity of the heat transfer liquid flow by periodically changing the cross-sectional size of the flow channel, so that when the heat transfer liquid flows over the surface area of ​​the heat transfer unit 2, it can flow at a relatively low speed and fully absorb the heat transferred by the heat transfer unit 2.

[0030] Preferably, the heat transfer unit 2 is embedded in the installation cavity 13 and the heat absorbing end surface is also provided with a heat conductive protective shell 21. Preferably, the heat transfer unit 2 can use a semiconductor heat exchange plate, which can define a heat absorbing surface and a heat releasing surface on the two surfaces of the plate body, so that it can efficiently transfer the heat of a specific chamber area, especially it can quickly transfer the heat to the heat transfer fluid that continuously flows in a directional manner in the heat transfer channel, thereby ensuring the effectiveness and efficiency of the heat transfer.

[0031] Preferably, the connecting pipeline 3 includes an inlet main pipe 31, an inlet branch pipe 32, an outlet main pipe 33 and a connecting pipe 34. Preferably, the connecting pipe 34, the inlet main pipe 31 and the inlet branch pipe 32 are connected in sequence. Further preferably, the input end of the connecting pipe 34 is connected to the output end of the heat dissipation component 4. Specifically, the output ends of a plurality of parallel inlet branch pipes 32 are inserted into the gap layer cavity 12 and are respectively connected to the parallel heat transfer channels. Preferably, the inlet branch pipes 32 are arranged at intervals on the side wall of the tube body of the inlet main pipe 31 to divert the heat transfer fluid that flows directionally in the inlet main pipe 31. Preferably, an axial liquid pump 341 for controlling the flow rate of the heat transfer fluid in the circulating cooling circuit constructed by the connecting pipeline 3, the heat dissipation component 4 and the heat transfer channel and a one-way valve 342 for limiting the unidirectional flow of the heat transfer fluid are arranged in the connecting pipe 34. The inlet branch pipe 32 provided in the present application can divide the heat transfer fluid flow according to the number and distribution of the heat transfer channels, so that the heat transfer fluid can be divided into different heat transfer channels in a state of approximately uniform flow. The present application provides an axial liquid pump 341 and a one-way valve 342 to adjust the flow rate and limit the flow direction to control the continuous flow of the heat transfer fluid in the circulating cooling channel, so as to continuously take away the heat transferred by the heat transfer unit 2.

[0032] Preferably, the heat dissipation assembly 4 includes a first heat dissipation branch pipe 41, a heat dissipation pipe 42, a heat sink 43, a heat dissipation fan 44, a support frame 45, a second heat dissipation branch pipe 46 and a manifold 47. Preferably, the branch outlet of the first heat dissipation branch pipe 41 corresponding to the heat transfer flow channel is connected to the input end of several parallel heat dissipation pipes 42. Further preferably, the output end of the heat dissipation pipe 42 is connected to the input end of the second heat dissipation branch pipe 46. Specifically, multiple mutually parallel second heat dissipation branch pipes 46 corresponding to different heat transfer flow channels are all connected to the same manifold 47 to realize the collection of the heat transfer fluid in the branch pipeline. Preferably, the input end of the first heat dissipation branch pipe 41 is connected to the output end of the inlet branch pipe 32. Preferably, several heat dissipation pipes 42 arranged side by side are supported on the outside of the main housing 1 in a manner parallel to the shell wall of the main housing 1. Preferably, the output end of the manifold 47 is connected to the input end of the connecting pipe 34. Preferably, the heat dissipation pipe 42 can be supported and positioned by the first heat dissipation branch pipe 41, and the relative position relationship between the side wall of the pipe and the outer shell wall of the main shell 1 can be limited by arranging a plurality of support and positioning blocks at intervals. Further preferably, the first heat dissipation pipe 41 and the second heat dissipation pipe 46 connected at both ends of the heat dissipation pipe 42 respectively support the outlet main pipe 33 and the support frame 45 whose connection positions are relatively fixed, so that their installation positions can be effectively limited. Preferably, the first heat dissipation branch pipe 41 can perform secondary diversion of the heat transfer fluid diverted by the parallel heat transfer flow channel, so that the heat transfer fluid after the secondary diversion can achieve heat dissipation in the heat dissipation pipe 42 more efficiently. Preferably, a plurality of heat sinks 43 are arranged at intervals on the surface of the heat dissipation pipe 42 away from the main shell 1. Preferably, the support frame 45 is supported on the outer shell wall of the main shell 1. Further preferably, a plurality of heat dissipation fans 44 are installed in an array on the installation plane defined by the support frame 45 to take away the heat from the surface of the heat dissipation pipe 42, that is, the heat sink 43 by generating airflow. Preferably, the heat sink 43 is constructed in a manner of constructing a cross-section to ensure that it has a larger heat conduction surface. Preferably, the support frame 45 ensures the firmness and anti-collision strength of its connection structure while firmly connecting and arranging the heat dissipation fan 44. The heat dissipation assembly 4 provided in the present application increases its surface area by constructing multiple groups of side-by-side heat dissipation pipes 42 and heat sinks 43 supported on the heat dissipation pipes 42 at intervals, thereby accelerating the diffusion of heat to the external environment. The present application also provides a heat dissipation fan 44 to generate a guide airflow, thereby accelerating the heat dissipated by the surface of the heat dissipation pipe 42 and the heat sink 43.

[0033] The present utility model is not limited to the above optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope of the claims of the present utility model fall within the protection scope of the present utility model. Those skilled in the art should understand that the present utility model specification and its drawings are illustrative and do not constitute limitations on the claims. The protection scope of the present utility model is defined by the claims and their equivalents. Throughout the text, the features guided by "preferably" are only an optional method and should not be understood as having to be set. Therefore, the applicant reserves the right to abandon or delete the relevant preferred features at any time.

Claims

1. A power combiner with closed inner cavity circulation cooling, comprising a main housing (1) for mounting a power combining substrate, characterized in that: A partition plate (11) is symmetrically arranged in the inner shell cavity of the main shell (1) to separate a gap layer cavity (12) and an installation inner cavity (13), and the gap layer cavity (12) is divided into a plurality of parallel heat transfer channels by a plurality of vertical plates (14) arranged at intervals; A plurality of heat transfer units (2) capable of transferring heat in the installation inner cavity (13) are embedded in an array on the partition (11), and a connecting pipe (3) communicating with a heat transfer channel of an internal component thereof is also penetrated through a cavity wall of the gap layer cavity (12) away from the installation inner cavity (13), and the connecting pipe (3) is also connected to a heat dissipation component (4), so that the connecting pipe (3), the heat dissipation component (4) and the heat transfer channel in the gap layer cavity (12) are connected in sequence to form a circulating cooling circuit.

2. The closed inner cavity circulation cooling power combiner as claimed in claim 1, characterized in that: The connecting pipeline (3) comprises an inlet main pipe (31), an inlet branch pipe (32), an outlet main pipe (33) and a connecting pipe (34), wherein: The connecting pipe (34), the inlet main pipe (31), and the inlet branch pipe (32) are connected in sequence, and the input end of the connecting pipe (34) is connected to the output end of the heat dissipation component (4), and the output ends of the plurality of parallel inlet branch pipes (32) are inserted into the gap layer cavity (12) and are respectively connected to the parallel heat transfer channels; The inlet branch pipes (32) are arranged at intervals on the side wall of the tube body of the inlet main pipe (31) to branch the heat transfer fluid that flows directionally in the inlet main pipe (31).

3. The closed inner cavity circulation cooling power combiner as claimed in claim 2, characterized in that: An axial liquid pump (341) for controlling the flow rate of the heat-conducting liquid in a circulating cooling circuit constructed by the connecting pipeline (3), the heat dissipation component (4) and the heat transfer channel, and a one-way valve (342) for limiting the one-way flow of the heat-conducting liquid are arranged in the connecting pipe (34).

4. The closed inner cavity circulation cooling power combiner as claimed in claim 3, characterized in that: The heat dissipation assembly (4) comprises a first heat dissipation branch pipe (41), a heat dissipation pipe (42), a heat sink (43), a heat dissipation fan (44), a support frame (45), a second heat dissipation branch pipe (46) and a manifold (47), wherein: The flow outlet of the first heat dissipation branch pipe (41) corresponding to the heat transfer channel is connected to the input ends of a plurality of parallel heat dissipation pipes (42), and the output end of the heat dissipation pipe (42) is connected to the input end of the second heat dissipation branch pipe (46). A plurality of the second heat dissipation branch pipes (46) connected in parallel and corresponding to different heat transfer channels are all connected to the same confluence pipe (47).

5. The closed inner cavity circulation cooling power combiner as claimed in claim 4, characterized in that: The input end of the first heat dissipation branch pipe (41) is connected to the output end of the inlet flow branch pipe (32), and a plurality of the heat dissipation pipes (42) arranged side by side are supported on the outside of the main housing (1) in a manner parallel to the housing wall of the main housing (1); The output end of the manifold (47) is in communication with the input end of the connecting pipe (34).

6. The closed inner cavity circulation cooling power combiner as claimed in claim 5, characterized in that: A plurality of heat sinks (43) are arranged at intervals on the surface of the heat dissipation pipe (42) away from the main housing (1); The support frame (45) is supported on the outer shell wall of the main shell (1), and a plurality of cooling fans (44) are installed in an array on the installation plane defined by the support frame (45).

7. The closed inner cavity circulation cooling power combiner as claimed in claim 6, characterized in that: The heat transfer unit (2) is embedded in the heat absorbing end surface of the installation inner cavity (13) and is also provided with a heat conductive protective shell (21).

8. The closed inner cavity circulation cooling power combiner as claimed in claim 7, characterized in that: On the inner wall of the main shell (1) away from the partition (11), flow limiting blocks (16) are arranged at intervals in a manner to define a periodically undulating variable-diameter flow channel.

9. The closed inner cavity circulation cooling power combiner as claimed in claim 8, characterized in that: On the inner wall of the main shell (1) between adjacent current limiting blocks (16), flow dividing columns (17) corresponding to the heat transfer units (2) are arranged in an array, and two adjacent rows of flow dividing columns (17) are arranged in a staggered manner.

10. The closed inner cavity circulation cooling power combiner as claimed in claim 9, characterized in that: A mounting plate (15) is also detachably provided in the mounting inner cavity (13), and an array of mounting through holes (151) are provided on the plate body of the mounting plate (15) for detachably mounting the power synthesis substrate and for heat dissipation; A heat-insulating partition plate (18) is also provided on the outer surface of the main housing (1) facing the heat dissipation pipe (42).

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