A passive sweat cooling device based on the principle of osmotic pressure difference

Abstract

The present invention discloses a passive sweating cooling device based on the principle of osmotic pressure difference, including heat dissipation ribs, exhaust channels, liquid supply pipes, semipermeable membranes, matrix cavities and storage tank devices. The side walls of the heat dissipation ribs are embedded with semipermeable membranes; the exhaust channels are arranged on both sides of the heat dissipation ribs, and the coolant vapor can flow to the outside of the device; the ends of the liquid supply pipes are blocked by semipermeable membranes; the matrix cavity includes an upper cavity and a matrix pipe connected between the top and the bottom wall of the upper cavity. The present invention is based on the principle that plant cells absorb and discharge water through osmotic pressure difference. When cooling high heat flux equipment, the coolant at the heat dissipation ribs absorbs heat and evaporates, and the osmotic pressure generated by the matrix solution is equal to the attraction of the liquid supply pipe to the coolant in the storage tank. The invention can spontaneously adjust and draw the coolant in the storage tank device, and the characteristics of low operating cost, high cooling efficiency, and wide application range are realized.

Description

Technical Field

[0001] The present invention relates to a sweating cooling device, and more specifically, to a passive sweating cooling device based on the osmotic pressure difference principle. Background Art

[0002] With the advancement of aviation technology and the development of the aviation industry, people have higher and higher requirements for aircraft performance and efficiency. During flight, affected by factors such as air flow friction and engine combustion, the temperature rise of the windward part of the aircraft will cause damage and thermal stress to the structure and components of the aircraft, and even increase the risk of accidents. However, due to its high efficiency in heat and mass transfer cooling, sweat cooling technology has been widely used in aerospace and other fields.

[0003] Most of the existing sweat cooling technologies are active cooling technologies, which require power equipment to pump coolant into the cooling body, and thus put forward certain requirements on the performance of the power equipment. Therefore, the construction and operation costs of the existing devices are relatively high. Summary of the invention

[0004] The purpose of the present invention is to overcome the problems existing in the prior art and to provide a passive sweat cooling device based on the osmotic pressure difference principle, which has the characteristics of low coolant pumping power and high cooling efficiency.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] The passive sweating cooling device based on the osmotic pressure difference principle of the present invention comprises a storage tank device and a matrix cavity, wherein the matrix cavity comprises an upper cavity and a matrix pipe connected between the top and the bottom wall of the upper cavity, the lower end of the matrix pipe is connected with the outlet of the liquid supply pipe, the bottom of the liquid supply pipe is inserted into the storage tank device, the inlet of the liquid supply pipe in the storage tank device is blocked with an inner semipermeable membrane, the top surface of the upper cavity of the matrix cavity is a concave-convex alternating structure, the convex part of the concave-convex alternating structure is a heat dissipation rib, notches are opened on the left and right side walls of each of the heat dissipation ribs, the side wall semipermeable membrane is embedded in the notch, and the groove part of the concave-convex alternating structure is a steam exhaust channel;

[0007] The matrix cavity contains a mixed solution with high osmotic pressure, the mixed solution is composed of a matrix solution and a coolant, the matrix solution in the mixed solution is a solution with large molecules, high specific heat capacity, low volatility and cannot pass through the side wall semipermeable membrane, the inner semipermeable membrane at the lower part of the liquid supply pipeline is completely immersed in the coolant fluid of the storage tank device, the coolant inside the storage tank device is a liquid fluid with small molecules, high specific heat capacity and can pass through the inner semipermeable membrane; the inner semipermeable membrane and the side wall semipermeable membrane are inorganic membranes or ultrafiltration membranes;

[0008] The coolant vapor that absorbs heat and evaporates at the top of the heat dissipation rib passes through the side wall semi-permeable membrane of the side of the heat dissipation rib to the exhaust channel, and the exhaust channel is connected to the external environment, so that the coolant vapor is discharged to the external environment.

[0009] Compared with the prior art, the advantages of the present invention are:

[0010] 1. In the passive sweating cooling device based on the osmotic pressure difference principle of the present invention, the coolant absorbs heat and evaporates and is discharged from the semipermeable membrane on the top of the heat dissipation rib. The concentration of the matrix solution in the matrix space at this location increases, ensuring that the osmotic pressure difference inside the matrix space continues to exist, and the coolant molecules can be efficiently transmitted in the matrix space.

[0011] 2. When the equipment is running, the osmotic pressure generated by the matrix solution at the heat dissipation ribs after the coolant evaporates is equal to the attraction of the coolant supply pipeline to the coolant in the storage tank, and the supply pipeline can spontaneously adjust the coolant supply.

[0012] 3. The present invention has the characteristics of simple structure, high cooling efficiency, low pumping power, etc., and can be used to complete cooling work in high heat flux equipment, aerospace and other fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a front view of the passive sweating cooling device based on the osmotic pressure difference principle of the present invention;

[0014] Figure 2 It is a top view of the passive sweating cooling device based on the osmotic pressure difference principle of the present invention;

[0015] Figure 3 It is a left view of the passive sweating cooling device based on the osmotic pressure difference principle of the present invention;

[0016] Figure 4 for Figure 1 A partial enlarged schematic diagram of point A of the structure shown. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] As shown in the accompanying drawings, a passive sweating cooling device based on the osmotic pressure difference principle disclosed by the present invention comprises a storage tank device 7 and a matrix cavity 4, wherein the matrix cavity 4 comprises an upper cavity 6 and a matrix pipe connected between the top and the bottom wall of the upper cavity, the lower end of the matrix pipe is connected to the outlet of the liquid supply pipe 5, the bottom of the liquid supply pipe is inserted into the storage tank device, an inner tube semipermeable membrane 3-1 is blocked at the inlet of the liquid supply pipe located in the storage tank device, the outer edge of the inner tube semipermeable membrane 3-1 is fixedly connected to the inlet of the liquid supply pipe, the top surface of the upper cavity 6 of the matrix cavity 4 is a concave-convex alternating structure, the convex part of the concave-convex alternating structure is a heat dissipation rib 1, notches are opened on the left and right side walls of each of the heat dissipation ribs, a side wall semipermeable membrane 3-2 is embedded in the notch, and the groove part of the concave-convex alternating structure is a steam exhaust channel 2.

[0019] The matrix cavity 4 is a mixed solution with high osmotic pressure. The mixed solution is composed of a matrix solution and a coolant. The matrix solution in the mixed solution is a solution of macromolecule, high specific heat capacity, non-volatile and can not penetrate the side wall semipermeable membrane. Preferably, the matrix solution is a lithium bromide solution, and the coolant is liquid water. The semipermeable membrane 3-1 in the tube at the bottom of the liquid supply pipeline 5 is fully immersed in the coolant fluid inside the tank device 7, and the coolant inside the tank device is a small molecule, high specific heat capacity and can pass through the liquid fluid of the semipermeable membrane in the tube, such as liquid water.

[0020] The upper cavity is preferably a disc-shaped structure. Compared with other structures, the disc-shaped structure has the largest area and can provide a larger heat dissipation area for high heat flux equipment.

[0021] The semipermeable membrane inside the tube and the semipermeable membrane on the side wall are membrane structures that only allow ions or small molecules to pass freely, but macromolecules cannot pass through. The semipermeable membrane inside the tube and the semipermeable membrane on the side wall have selective permeability to different substances. The osmotic pressure of the solution increases with the increase of its concentration. When two aqueous solutions of different concentrations are separated by the semipermeable membrane inside the tube and the semipermeable membrane on the side wall, water molecules can pass through the semipermeable membrane from one side of the low osmotic pressure solution to the other side of the high osmotic pressure solution through diffusion, but the remaining macromolecules cannot pass through the membrane structure, such as an inorganic membrane or an ultrafiltration membrane. The material has good high temperature resistance, high pressure resistance and other properties.

[0022] See also Figure 1-4 The heat dissipation ribs 1 and the exhaust passages 2 are arranged at intervals. The coolant vapor that absorbs heat and evaporates at the top of the heat dissipation ribs 1 can pass through the side wall semipermeable membrane 3-2 on the side of the heat dissipation ribs to the exhaust passages 2. The exhaust passages 2 are connected to the external environment, so that the coolant vapor can be discharged to the external environment.

[0023] Working principle of the present invention:

[0024] When the present invention is in operation, the top of the heat dissipation rib 1 contacts and cools the high heat generating surface of the high heat flux device (electronic device chip, high-speed aircraft, etc.), and the high heat flux is applied to the top of the heat dissipation rib 1, and the heat is transferred to the mixed solution inside the matrix cavity 4 through the top of the heat dissipation rib 1. As the heat is continuously transferred to the upper cavity of the matrix cavity 4, the liquid coolant in the mixed solution there is gradually heated to a vapor state, and the coolant vapor small molecules pass through the side wall semipermeable membrane 3-2 and are discharged to the external environment through the exhaust channel 2.

[0025] As the coolant evaporates at the heat dissipation rib 1 and is discharged through the side wall semipermeable membrane 3-2, the concentration of the matrix solution in the mixed solution at this location increases, and the osmotic pressure increases, and the ability to absorb the coolant is enhanced. The concentration of the matrix solution inside the mixed solution in the liquid supply pipe 5 far from the heat dissipation rib 1 is relatively low, and the osmotic pressure of the matrix solution there is lower than that at the heat dissipation rib 1, so that the coolant is migrated to the heat dissipation rib 1. In this process, the overall osmotic pressure of the matrix cavity 4 increases. The osmotic balance between the mixed solution in the matrix cavity 4 and the coolant in the storage tank device 7 is broken, and the coolant (such as liquid water) in the storage tank device 7 is sucked to penetrate the semipermeable membrane 3-1 in the tube at the end of the liquid supply pipe 5 to the matrix cavity 4, so as to achieve a dynamic osmotic balance between the matrix space and the storage tank device 7. During the operation of the heat dissipation device, the internal coolant continues the above-mentioned circulation process to achieve the effect of self-suction sweating cooling.

[0026] The existing sweating cooling technology is an active cooling thermal protection system, which requires a power device to supply coolant. However, the device proposed in the present invention does not require a power device to supply the coolant inside, so its pumping power is as low as 0.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A passive sweat cooling device based on the osmotic pressure difference principle, characterized in that: The invention comprises a storage tank device and a matrix cavity, wherein the matrix cavity comprises an upper cavity and a matrix pipe connected between the top and the bottom wall of the upper cavity, the lower end of the matrix pipe is connected with the outlet of the liquid supply pipe, the bottom of the liquid supply pipe is inserted into the storage tank device, the inlet of the liquid supply pipe in the storage tank device is blocked with an inner semipermeable membrane, the top surface of the upper cavity of the matrix cavity is a concave-convex alternating structure, the convex part of the concave-convex alternating structure is a heat dissipation rib, notches are opened on the left and right side walls of each of the heat dissipation ribs, the side wall semipermeable membrane is embedded in the notch, and the groove part of the concave-convex alternating structure is a steam exhaust channel; The matrix cavity contains a mixed solution with high osmotic pressure, the mixed solution is composed of a matrix solution and a coolant, the matrix solution in the mixed solution is a solution with large molecules, high specific heat capacity, low volatility and cannot pass through the side wall semipermeable membrane, the inner semipermeable membrane at the lower part of the liquid supply pipeline is completely immersed in the coolant fluid of the storage tank device, the coolant inside the storage tank device is a liquid fluid with small molecules, high specific heat capacity and can pass through the inner semipermeable membrane; the inner semipermeable membrane and the side wall semipermeable membrane are inorganic membranes or ultrafiltration membranes; The coolant vapor that absorbs heat and evaporates at the top of the heat dissipation rib passes through the side wall semi-permeable membrane of the side of the heat dissipation rib to the exhaust channel, and the exhaust channel is connected to the external environment, so that the coolant vapor is discharged to the external environment.

2. The passive sweating cooling device based on the osmotic pressure difference principle according to claim 1, characterized in that: The matrix solution is a lithium bromide solution, and the coolant in the mixed solution and the coolant in the storage tank device are liquid water.

3. The passive sweat cooling device based on the osmotic pressure difference principle according to claim 1 or 2, characterized in that: The upper cavity is a disc-shaped structure.

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