A flow distribution framework based on piezoelectric drive

Abstract

The present invention belongs to the technical field of airborne electronic equipment, and discloses a flow distribution framework based on piezoelectric drive. A planar microchannel is provided on the lower surface of the flow channel plate assembly, and a vertical microchannel is provided on the main frame assembly. The main frame assembly and the flow channel plate assembly are welded together to jointly form a sealed microchannel structure. The main frame assembly is provided with an installation groove for a piezoelectric precision valve. The piezoelectric precision valve is arranged in the installation groove of the piezoelectric precision valve, and the liquid inlet and liquid outlet of the piezoelectric precision valve are respectively connected to the microchannel structure. The flow rate of the coolant flowing through is controlled by the piezoelectric precision valve. A circuit board assembly is installed below the main frame assembly. The circuit board assembly is used to control the piezoelectric precision valve and is also equipped with an external connector assembly. The bottom cover plate assembly is installed below the circuit board assembly. Two external liquid cooling interfaces are respectively arranged at the two diagonal ends of the bottom cover plate assembly. A plurality of internal liquid cooling interfaces are provided on the flow channel plate assembly. One end of the internal liquid cooling interface is communicated with the planar microchannel, and the other end is connected to the heat dissipation structure of the antenna subarray.

Description

Technical Field

[0001] The present invention belongs to the technical fields of airborne electronic equipment, intelligent skin antenna, and microchannel heat dissipation, and particularly relates to a flow distribution framework based on piezoelectric drive. Background Art

[0002] Skin antenna technology is an airborne antenna technology vigorously developed abroad in recent years, also known as load-bearing conformal antenna technology. Among them, the skin antenna subarray serves as the carrier for electronic components such as antenna modules, high-voltage power supplies, TR components, and various connectors, with high heat dissipation requirements and large size constraints. Therefore, general skin antennas often adopt passive flow distribution methods, with low flexibility and no adjustability to change the flow distribution according to the functions of different antenna array surfaces. Summary of the Invention

[0003] The purpose of the present invention is to provide a flow distribution framework based on piezoelectric drive, which uses the secondary framework structure of the skin antenna system to install a piezoelectric-driven precision flow valve to achieve active flow distribution. It can make full use of the characteristics of the piezoelectric drive device, such as small size, high precision, and fast response, to realize electrically controlled flow distribution and control within a limited space. It can adjust the coolant distribution strategy in real time according to the heat dissipation conditions of the actual skin antenna subarray, improve the rationality of product heat dissipation and cooling efficiency, and promote the further development and more engineering applications of airborne intelligent skin technology.

[0004] The technical solution of the present invention is as follows:

[0005] A flow distribution framework based on piezoelectric drive includes: a flow channel plate assembly, a main frame assembly, a circuit board assembly, a bottom cover plate assembly, and a piezoelectric precision valve;

[0006] The lower surface of the flow channel plate assembly is provided with a planar microchannel, and the main frame assembly is provided with a vertical microchannel. The main frame assembly is welded to the flow channel plate assembly. One end of the vertical microchannel communicates with the installation groove of the liquid cooling interface on the main frame assembly, and the other end communicates with the planar microchannel. The planar microchannel and the vertical microchannel together form a closed microchannel structure;

[0007] The main frame assembly is provided with a piezoelectric precision valve installation groove. The piezoelectric precision valve is arranged in the piezoelectric precision valve installation groove, and the liquid inlet and outlet of the piezoelectric precision valve are respectively connected to the microchannel structure, and the flow rate of the coolant flowing through is controlled by the piezoelectric precision valve;

[0008] The circuit board assembly is installed below the main frame assembly. The circuit board assembly is used to control the piezoelectric precision valve and is also installed with an external connector assembly;

[0009] The bottom cover plate assembly is installed below the circuit board assembly. Two external liquid cooling interfaces are respectively arranged at two diagonal ends of the bottom cover plate assembly. One end of each external liquid cooling interface communicates with the vertical microchannel of the main frame assembly, and the other end is connected to the airborne liquid supply pipeline.

[0010] Multiple internal liquid cooling interfaces are arranged on the flow channel plate assembly. One end of each internal liquid cooling interface communicates with the planar microchannel, and the other end is connected to the liquid cooling interface of the antenna subarray.

[0011] Further, the piezoelectric precision valve includes: a housing, a throttle valve core, a spring, a push rod, a lever, a lead screw, a metal matrix, and piezoelectric ceramic sheets.

[0012] The housing is provided with two cylindrical cavities, one long and one short, and the bottoms of the two cylindrical cavities are communicated.

[0013] A push rod is arranged at the bottom of the long cylindrical cavity. The throttle valve core is connected above the push rod, and the spring is arranged between the throttle valve core and the top of the long cylindrical cavity.

[0014] A metal matrix is arranged in the short cylindrical cavity. A lead screw is arranged in the metal matrix. The lower end of the lead screw is connected to the lower end of the push rod through a lever. The lead screw is in threaded connection with the rectangular metal matrix. Two groups of piezoelectric ceramic sheets are respectively arranged on four side surfaces of the rectangular metal matrix. The two groups of piezoelectric ceramic sheets are respectively connected to the circuit board assembly through wires.

[0015] The reciprocating linear motion of the lead screw is driven by the two groups of piezoelectric ceramic sheets, and the push rod is driven to move after being amplified by the lever. The push rod drives the throttle valve core to move against the spring force, so as to adjust the flow rate between the liquid inlet and outlet, thereby adjusting the flow rate of the liquid flowing through the precision piezoelectric valve in the microchannel.

[0016] Further, the two groups of piezoelectric ceramic sheets respectively have the same polarization direction, and sinusoidal voltage signals with a phase difference of 90° are respectively applied to the two groups of piezoelectric ceramic sheets.

[0017] Further, the microchannel structure is divided into two parts, namely a coolant diversion part and a coolant confluence part.

[0018] The coolant diversion part is connected to the liquid inlet of one external liquid cooling interface and the liquid outlets of N internal liquid cooling interfaces.

[0019] The coolant confluence part is connected to the liquid outlet of one external liquid cooling interface and the liquid inlets of N internal liquid cooling interfaces.

[0020] The coolant enters from the liquid inlet of the external liquid cooling interface and then flows from the liquid outlets of the N internal liquid cooling interfaces to the heat dissipation structures of the N antenna subarrays respectively to dissipate heat for the antenna subarrays; then it enters the coolant confluence part through the liquid inlets of the N internal liquid cooling interfaces, and then flows out after being collected through the liquid outlet of the external liquid cooling interface.

[0021] Further, N is the number of antenna sub-arrays.

[0022] Further, the number of piezoelectric precision valves is 2N, and each of the liquid inlet and the liquid outlet of the internal liquid cooling interface is matched with a piezoelectric precision valve; the flow rate of the coolant flowing through the liquid inlet and the liquid outlet of the internal liquid cooling interface is controlled by the piezoelectric precision valve.

[0023] Further, N = 2m, where m is a positive integer.

[0024] Further, the coolant flows into the coolant distribution part from the external liquid cooling interface liquid inlet, and after the first distribution, it flows to the first internal liquid cooling interface liquid outlet and the second internal liquid cooling interface liquid outlet through the first piezoelectric precision valve and the second piezoelectric precision valve respectively;

[0025] The coolant flowing directly out of the second internal liquid cooling interface liquid outlet dissipates heat for the second antenna sub-array;

[0026] At the first internal liquid cooling interface liquid outlet, the coolant undergoes a second distribution. A part of it directly flows out of the first internal liquid cooling interface liquid outlet to dissipate heat for the first antenna sub-array, and the other part flows to the third distribution port;

[0027] After being distributed at the third distribution port, it flows to the third internal liquid cooling interface liquid outlet and the fourth internal liquid cooling interface liquid outlet through the third piezoelectric precision valve and the fourth piezoelectric precision valve;

[0028] The coolant flowing directly out of the fourth internal liquid cooling interface liquid outlet dissipates heat for the fourth antenna sub-array;

[0029] The coolant at the third internal liquid cooling interface liquid outlet is distributed for the fourth time in the same way as the first internal liquid cooling interface liquid outlet until all the internal liquid cooling interface liquid outlets are traversed.

[0030] Beneficial effects

[0031] Compared with the prior art, for the flow distribution framework based on piezoelectric drive of the present invention, by installing a piezoelectric drive-based precision flow valve using the secondary framework structure of the skin antenna system to achieve active flow distribution, the characteristics of small size, high precision, and fast response of the piezoelectric drive device can be fully utilized to realize electrically controlled flow distribution and control within a limited space. The distribution strategy of the coolant can be adjusted in real time according to the actual heat dissipation conditions of the skin antenna sub-arrays, improving the rationality of product heat dissipation and the cooling efficiency, and promoting the further development and more engineering applications of the airborne intelligent skin technology. Therefore, the technical solution of the present invention is generally applicable to the use of the skin antenna system of the new generation of aircraft and has an economic value that cannot be ignored. Description of the drawings

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 is a schematic structural diagram of the skin antenna system of the present invention;

[0034] Figure 2 is a schematic structural diagram of the flow distribution framework of the present invention;

[0035] Figure 3 is a schematic structural diagram of the piezoelectric precision valve of the present invention;

[0036] Figure 4 is a schematic diagram of the route of the coolant flow channel of the present invention;

[0037] Figure 5 is a schematic diagram of the operation of the piezoelectric precision valve of the present invention.

[0038] Among them, 1 - 4×4 skin antenna sub - array, 2 - flow distribution framework, 3 - internal liquid - cooling interface, 4 - flow channel plate assembly, 5 - main frame assembly, 6 - piezoelectric precision valve, 7 - circuit board assembly, 8 - bottom cover plate assembly, 9 - external liquid - cooling interface, 10 - external connector assembly, 11 - upper cover, 12 - spring, 13 - sealing ring, 14 - throttle valve core, 15 - housing, 16 - outlet metal rubber, 17 - push rod, 18 - lower cover, 19 - lever amplification mechanism, 20 - lead screw, 21 - piezoelectric ceramic sheet, 22 - metal matrix, 23 - wire, 24 - inlet metal rubber, 25 - vertical flow channel, 26 - horizontal flow channel. Detailed implementation manners

[0039] To enable those skilled in the art to better understand the technical solutions of the present invention, the following gives detailed implementation manners to further describe the present invention in detail.

[0040] Please refer to Figure 1 shown, which is a schematic structural diagram of the skin antenna system of the present invention. The flow distribution framework based on piezoelectric drive for implementing the present invention can install at most four antenna sub - arrays and provide liquid - cooling coolant for heat dissipation.

[0041] Please refer to Figure 2As shown in the figure, it is a schematic structural diagram of the flow distribution framework of the skin antenna system of the present invention. The flow distribution framework based on piezoelectric drive of the present invention includes a flow channel cold plate assembly 4, a main frame assembly 5, a bottom cover plate assembly 8, a circuit board assembly 7, an external connector assembly 10, a pair of external liquid cooling interfaces 9, four pairs of internal liquid cooling interfaces 3, and four pairs of piezoelectric precision valves 6.

[0042] Please refer to Figure 4 As shown in the figure, it is a schematic diagram of the route of the cooling flow channel of the present invention. The liquid cooling interfaces of the present invention are all installed on the main frame assembly. The main frame assembly has vertical microchannels. Four groups of planar microchannel structures are machined on the inner side of the flow channel plate assembly. The main frame assembly and the flow channel plate assembly are connected by vacuum brazing. One end of the vertical microchannel communicates with the planar microchannel, and one end communicates with the liquid cooling interface, and a closed microchannel structure is jointly formed by the vertical microchannel and the planar microchannel. The four pairs of piezoelectric precision valves are installed in the main frame assembly, and their liquid inlets and outlets are all connected to the planar microchannels of the flow channel plate assembly to control the flow rate of the coolant in the microchannels. Thus, the flow distribution function for four different skin antenna sub-arrays is realized. Therefore, the coolant enters from the external liquid inlet, is respectively shunted and flows through the vertical microchannel, the planar microchannel, and the piezoelectric precision valve, and then will flow to the four internal liquid outlets, enter four different skin antenna sub-arrays for liquid cooling and heat dissipation, and respectively return from the corresponding four internal liquid inlets, flow through the piezoelectric precision valve, the planar microchannel, and the vertical microchannel again, and finally converge to the external liquid outlet.

[0043] According to the above main features, a pair of external liquid cooling interfaces and four pairs of internal liquid cooling interfaces are installed on the flow distribution framework. Among the pair of external liquid cooling interfaces, one is the liquid inlet and one is the liquid outlet. The four pairs of internal liquid cooling interfaces are evenly distributed at the diagonal positions of four rectangular sub-arrays. Two liquid cooling interfaces are arranged in each sub-array area, one is the liquid inlet and one is the liquid outlet. The coolant first enters the vertical microchannel in the main frame assembly from the external liquid inlet, and then flows through the planar microchannel machined on the flow channel plate assembly. After the first shunt, it respectively passes through the first and second piezoelectric precision valves and converges to the first and second internal liquid outlets respectively. The flow rate of the first internal liquid outlet is shunted for the second time, flows to the first sub-array and the third shunt port respectively. After being shunted by the third shunt port, it respectively passes through the third and fourth piezoelectric valves and then converges to the third and fourth internal liquid outlets respectively. Finally, the flow rate reaching the internal liquid outlet converges to the corresponding internal liquid inlets respectively after passing through the antenna sub-array, and correspondingly passes through the piezoelectric precision valve and the converging port respectively again, and finally converges to the external liquid outlet and flows out.

[0044] Please refer to Figure 3As shown in the figure, it is a schematic structural diagram of the piezoelectric precision valve of the present invention. The piezoelectric precision valve implementing the present invention includes an upper cover, a spring, two sealing rings, a throttle valve core, a housing, an outlet metal rubber, an inlet metal rubber, a push rod, a lower cover, a lever amplification mechanism, a lead screw, two groups of piezoelectric ceramic sheets, an alloy matrix, and four groups of wires. By applying a sinusoidal alternating current with a specific frequency to the two groups of piezoelectric ceramic sheets, according to the inverse piezoelectric effect, the piezoelectric ceramic sheets are excited to generate resonance, which will cause the alloy body to produce a small reciprocating nodding motion, thereby realizing the reciprocating linear motion of the lead screw. Through the lever amplification mechanism, the push rod is driven, and the displacement is transmitted to the throttle valve core, overcoming or releasing the spring force, thereby opening or closing the throttle port, achieving the purpose of controlling the coolant flow rate on the microchannel and realizing flow distribution.

[0045] Please refer to Figure 5 As shown in the figure, it is a schematic working diagram of the piezoelectric precision valve of the present invention. The two groups of piezoelectric ceramic sheet groups implementing the present invention have the same polarization direction respectively. Sinusoidal voltage signals with a phase difference of 90° are applied to them respectively. At a specific voltage frequency, it will cause the alloy matrix to produce a torsional motion relative to its axis, causing the lead screw internally threaded with the metal matrix to produce a directional rotational linear motion. When the phase difference of the applied sinusoidal voltage signal is -90°, it will cause the lead screw to produce a rotational linear motion in the opposite direction. Through the lever amplification mechanism, the rotational linear motion of the lead screw is transmitted to the push rod, and then to the throttle valve core, thereby controlling the opening or closing degree of the throttle port, realizing the electrical signal control of the coolant flow rate on the microchannel, and thus achieving the purpose of flow distribution.

[0046] Compared with the prior art, for the flow distribution framework based on piezoelectric drive and its working mode implementing the present invention, by installing a piezoelectric-driven precision flow valve using the secondary framework structure of the skin antenna system to achieve active flow distribution, it can make full use of the characteristics of the piezoelectric drive device, such as small size, high precision, and fast response, to realize electrically controlled flow distribution and control in a limited space. It can adjust the coolant distribution strategy in real time according to the heat dissipation conditions of the actual skin antenna subarray, improve the rationality of product heat dissipation and cooling efficiency, and promote the further development and more engineering applications of the airborne intelligent skin technology. Therefore, the technical solution of the present invention is generally applicable to the use of the skin antenna system of the new generation of aircraft, and has an economic value that cannot be ignored.

[0047] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A flow distribution framework based on piezoelectric drive, characterized in that: The skeleton comprises: a flow channel plate assembly, a main frame assembly, a circuit board assembly, a bottom cover plate assembly and a piezoelectric precision valve; The lower surface of the flow channel plate assembly is provided with a planar microchannel, the main frame assembly is provided with a vertical microchannel, the main frame assembly and the flow channel plate assembly are welded together, and the planar microchannel and the vertical microchannel together form a closed microchannel structure; The main frame assembly is provided with a piezoelectric precision valve installation groove, the piezoelectric precision valve is arranged in the piezoelectric precision valve installation groove, and the liquid inlet and liquid outlet of the piezoelectric precision valve are respectively connected to the microchannel structure, and the flow rate of the coolant flowing through is controlled by the piezoelectric precision valve; A circuit board assembly is installed below the main frame assembly, and the circuit board assembly is used to control the piezoelectric precision valve; The bottom cover assembly is installed below the circuit board assembly, and an external liquid cooling interface is respectively provided at both ends of the diagonal of the bottom cover assembly, one end of the external liquid cooling interface is connected to the vertical microchannel of the main frame assembly, and the other end is connected to the cooling liquid input pipe; The flow channel plate assembly is provided with a plurality of internal liquid cooling interfaces, one end of the internal liquid cooling interface is connected to the planar micro-flow channel, and the other end is connected to the liquid cooling interface of the antenna sub-array; The microchannel structure is divided into two parts, namely a cooling liquid diversion part and a cooling liquid confluence part; the cooling liquid diversion part is connected to an external liquid cooling interface inlet and N internal liquid cooling interface outlets; the cooling liquid confluence part is connected to an external liquid cooling interface outlet and N internal liquid cooling interface inlets; the cooling liquid flows into the cooling liquid diversion part from the external liquid cooling interface inlet, and after the first diversion, flows from the first piezoelectric precision valve and the second piezoelectric precision valve to the first pair of internal liquid cooling interface outlets and the second pair of internal liquid cooling interface outlets respectively; the second pair of internal liquid cooling interface outlet directly flows out to dissipate heat for the second antenna subarray; the cooling liquid at the first pair of internal liquid cooling interface outlets undergoes a second diversion, and a part of it flows directly from the first pair of internal liquid cooling interface outlets A pair of internal liquid-cooling interface outlets flows out to dissipate heat for the first antenna subarray, and the other part flows to the third diversion port; after being diverted at the third diversion port, it flows through the third piezoelectric precision valve and the fourth piezoelectric precision valve to the third pair of internal liquid-cooling interface outlets and the fourth pair of internal liquid-cooling interface outlets; the fourth pair of internal liquid-cooling interface outlets directly flows out to dissipate heat for the fourth antenna subarray; the coolant at the third pair of internal liquid-cooling interface outlets is diverted for the fourth time in the same manner as the first pair of internal liquid-cooling interface outlets until it traverses all the internal liquid-cooling interface outlets, and flows to the heat dissipation structures of the N antenna subarrays respectively to dissipate heat for the antenna subarrays; then it enters the cooling liquid confluence through the N internal liquid-cooling interface inlets, and then converges and flows out through the external liquid-cooling interface outlet.

2. The flow distribution framework according to claim 1, characterized in that: The piezoelectric precision valve comprises: a housing, a throttle valve core, a spring, a push rod, a lever, a screw rod, a metal matrix, and a piezoelectric ceramic sheet; The housing is provided with two cylindrical cavities, one long and one short, and the bottoms of the two cylindrical cavities are connected; A push rod is provided at the bottom of the long cylindrical cavity, a throttle valve core is connected above the push rod, and a spring is provided between the throttle valve core and the top of the long cylindrical cavity; A metal substrate is provided inside the short cylindrical cavity. A lead screw is provided in the metal substrate. The lower end of the lead screw is connected to the lower end of a push rod through a lever. The lead screw is in threaded connection with the rectangular metal substrate. Two groups of piezoelectric ceramic sheets are respectively arranged on the four side surfaces of the rectangular metal substrate. The two groups of piezoelectric ceramic sheets are respectively connected to a circuit board assembly through wires. The two groups of piezoelectric ceramic sheets drive the lead screw to perform reciprocating linear motion, and drive the push rod to move after being amplified by the lever. The push rod drives the throttle valve core to move against the spring force, adjusts the flow rate between the liquid inlet and outlet, and thus adjusts the flow rate of the microchannel flowing through the precision piezoelectric valve.

3. The flow distribution framework according to claim 2, characterized in that: The two groups of piezoelectric ceramic sheets respectively have the same polarization direction, and sinusoidal voltage signals with a phase difference of 90° are respectively applied to the two groups of piezoelectric ceramic sheets.

4. The flow distribution framework according to claim 1, wherein: N is the number of antenna sub-arrays.

5. The flow distribution framework according to claim 1, characterized in that: The number of piezoelectric precision valves is 2N. Each inner liquid cooling interface liquid inlet and each inner liquid cooling interface liquid outlet are each matched with a piezoelectric precision valve; the flow rate of the coolant flowing through the inner liquid cooling interface liquid inlet and the inner liquid cooling interface liquid outlet is controlled by the piezoelectric precision valve.

6. The flow distribution framework according to claim 5, characterized in that: N = 2m, where m is a positive integer.

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