A heat pipe heat exchanger with intelligent control

Abstract

The present invention provides an intelligently controlled heat pipe heat exchanger, wherein a guide plate is arranged in a cold source box, and a guide plate is arranged between two adjacent condensing ends; the guide plate comprises an upper guide plate and a lower guide plate, wherein the upper guide plate extends from the upper part of the cold source box to the center of the cold source box, and the lower guide plate extends from the lower part of the cold source box to the center of the cold source box, and the upper guide plate and the lower guide plate are arranged at intervals. The present invention enables the fluid to pass through all areas of the condensing end even at a small flow rate, thereby avoiding the heat exchange short circuit phenomenon and improving the heat exchange effect of the heat source heat exchanger.

Description

Technical Field

[0001] The invention relates to a heat exchanger, belonging to the technical field of heat exchangers, in particular to the field of heat pipes classified under F28d15 / 02. Background Art

[0002] In industrial production, heat exchangers are often used to exchange heat, cool the medium, and utilize the heat of the medium. The heat pipes in commonly used heat exchangers are gravity heat pipes or two-phase thermosyphons, which rely on the working medium in the heat pipe to absorb heat at one end and then turn into vapor to release heat at the other end, and then flow back from one end to the other end under the action of gravity, repeating the cycle to achieve heat exchange.

[0003] Heat pipe technology is a heat transfer element called "heat pipe" invented by George Grover of Los Alamos National Laboratory in the United States in 1963. It makes full use of the principle of heat conduction and the rapid heat transfer properties of phase change media. It transfers the heat of the heating object to the outside of the heat source quickly through the heat pipe. Its thermal conductivity exceeds that of any known metal.

[0004] Heat pipe technology was previously widely used in aerospace, military and other industries. Since it was introduced into the radiator manufacturing industry, people have changed the design ideas of traditional radiators, getting rid of the single cooling mode that simply relies on high air volume motors to obtain better cooling effects. The use of heat pipe technology enables radiators to obtain satisfactory heat exchange effects, opening up a new world for the cooling industry. At present, heat pipes are widely used in various heat exchange equipment, including nuclear power and computer fields, such as the utilization of waste heat from nuclear power.

[0005] In the heat pipe heat exchanger in the prior art, the condensing end penetrates a certain distance into the heat exchange box body. However, because the fluid flow path in the box body is long and multiple condensing ends generally penetrate to the same height, a short circuit occurs during the fluid flow process, resulting in poor heat exchange effect at the top of the heat pipe condensing end, thereby causing poor local heat exchange effect.

[0006] The invention designs a novel heat pipe heat exchanger, improves the structure of the traditional heat pipe heat exchanger, reduces the short circuit phenomenon in the heat exchange pipe, and improves the heat exchange effect of the heat pipe. Summary of the invention

[0007] In order to achieve the above object, the technical solution of the present invention is as follows:

[0008] A heat pipe heat exchanger comprises a heat pipe, a heat source box and a cold source box, wherein the heat pipe comprises an evaporation end and a condensation end, the evaporation section is arranged in the heat source box, the condensation end is arranged in the cold source box, and the heat source box is located at the upper part. The cold source box is located at the lower part; the cold source box comprises a cold source inlet and a cold source outlet, characterized in that the depth of the condensation end penetrating into the cold source box is 50%-95% of the height of the cold source box, a guide plate is arranged in the cold source box, and a guide plate is arranged between two adjacent condensation ends; the guide plate comprises an upper guide plate and a lower guide plate, the upper guide plate extends from the upper part of the cold source box to the center of the cold source box, the lower guide plate extends from the lower part of the cold source box to the center of the cold source box, and the upper guide plate and the lower guide plate are arranged at intervals.

[0009] Preferably, the depth of the guide plate extending to the cold source box is 70-85% of the height of the cold source box.

[0010] Preferably, the cold source inlet is arranged at the lower end of the left side of the cold source box, and the cold source outlet is arranged at the upper part of the right side of the cold source box.

[0011] Preferably, the guide plate close to the cold source inlet is the lower guide plate, and the guide plate close to the cold source outlet is the upper guide plate.

[0012] Preferably, the heat release capacity of the condensation end gradually increases along the direction from the inlet to the outlet of the cold source box.

[0013] Preferably, along the direction from the inlet to the outlet of the cold source box, the heat release capacity of the condensation end gradually increases.

[0014] Preferably, the heat source box is arranged in a horizontal direction, and the heat pipe is arranged in a vertical direction.

[0015] Preferably, the depth of the condensation end penetrating into the cold source box is more than 75% of the height of the cold source box.

[0016] Preferably, the cooling source is water or air.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] The present invention arranges a guide plate between the condensation ends of the cold source box, and the guide plate extends alternately through the upper and lower parts, so that the cold source flows along a curved path in the box, so that the fluid can pass through all areas of the condensation end even at a small flow rate, avoiding the occurrence of heat exchange short circuits and improving the heat exchange effect of the heat source heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the front cross-sectional structure of the heat pipe heat exchanger of the present invention;

[0020] Figure 2 It is a schematic diagram of the longitudinal section structure of the heat pipe heat exchanger of the present invention; DETAILED DESCRIPTION

[0021] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings.

[0022] In this article, unless otherwise specified, “ / ” represents division, and “×” and “*” represent multiplication.

[0023] In the description of the present invention, terms such as "inside", "outside", "up", "down", "front", "back", "left", and "right" indicating directions or positional relationships are based on the positions or orientational relationships shown in the accompanying drawings, and do not indicate or imply a specific installation and operating direction that the described device or element must have, and therefore cannot be understood as a limitation on the present invention.

[0024] The technical solutions in the embodiments of the present invention will be supplemented below with reference to the accompanying drawings in the embodiments of the present invention.

[0025] Figure 1 A heat pipe heat exchanger is disclosed. The heat pipe heat exchanger comprises a heat pipe 1, a heat source box 2 and a cold source box 3, wherein the heat pipe 1 comprises an evaporation end 11 and a condensation end 12, wherein the evaporation end 11 is arranged in the heat source box 2, and the condensation end 12 is arranged in the cold source box 3, wherein the heat source box 2 is located at the upper part and the cold source box 3 is located at the lower part; and the cold source box 3 comprises a cold source inlet 4 and a cold source outlet 5. A plurality of heat pipes are arranged along the flow direction of the cold source.

[0026] As an improvement, the depth of the condensation end 12 penetrating into the cold source box 2 is 50%-95% of the height of the cold source box, and a guide plate 6 is provided in the cold source box. Figure 1 As shown, a drain plate 6 is arranged between two adjacent condensation ends 12; the drain plate 6 includes an upper drain plate 61 and a lower drain plate 62, the upper drain plate 61 extends from the upper part of the cold source box body to the center of the cold source box body 3, and the lower drain plate 62 extends from the lower part of the cold source box body to the center of the cold source box body, and the upper drain plate and the lower drain plate are arranged at intervals.

[0027] The present invention arranges a guide plate between the condensation ends of the cold source box, and the guide plate extends alternately through the upper and lower parts, so that the cold source flows along a curved path in the box, so that the fluid can pass through all areas of the condensation end even at a small flow rate, avoiding the occurrence of heat exchange short circuits and improving the heat exchange effect of the heat source heat exchanger.

[0028] The present invention allows the condensation end 12 to penetrate into the cold source box 2 to a depth of 50%-95% of the height of the cold source box, and is combined with a guide plate, so that the provision of the guide plate becomes necessary. Otherwise, if the condensation end penetrates into the box too short, the entire condensation end 12 can be immersed in the fluid, so there is no short circuit phenomenon. Moreover, if the depth is too short, the heat exchange efficiency of the heat pipe is affected, and the heat exchange area is reduced. If the depth exceeds 95%, the flow resistance will be greatly increased, resulting in increased costs.

[0029] Preferably, the depth of the guide plate extending to the cold source box is 70-85% of the height of the cold source box. By setting this height, the cold source can pass through the condensation end, the heat exchange area is large enough, and suitable flow resistance can be guaranteed.

[0030] Preferably, Figure 1 As shown, the cold source inlet is arranged at the lower end of the left side of the cold source box, and the cold source outlet is arranged at the upper part of the right side of the cold source box. Preferably, the guide plate close to the cold source inlet is the lower guide plate, and the guide plate close to the cold source outlet is the upper guide plate. Through the above-mentioned matching arrangement, the fluid can be guided to fully pass through the condensation end for heat exchange.

[0031] As an improvement, the guide plate 6 is arranged in the middle of two adjacent condensation ends to further enhance heat transfer.

[0032] Preferably, along the direction from the inlet to the outlet of the cold source box 2, that is, Figure 1 In the direction from left to right, multiple condensation ends are arranged, and the heat release capacity of the condensation ends gradually increases along the direction from the inlet to the outlet in the cold source box 2. Because the cold source flows from left to right, the temperature is constantly increasing during the flow process, and the heat release capacity of the condensation end is gradually increased, which can be regarded as the temperature of the heat source is constantly increasing from right to left, that is, it is equivalent to the hot fluid flowing from right to left, realizing the countercurrent heat exchange operation of the cold and hot fluids, thereby realizing the maximum heat exchange capacity of the heat pipe heat exchanger.

[0033] Preferably, along the direction from the inlet to the outlet of the cold source box, the heat release capacity of the condensing end gradually increases. The above-mentioned setting of the change range can further improve the heat exchange efficiency, making the heat exchange process of the heat pipe heat exchanger closer to countercurrent heat exchange.

[0034] As an improvement, the heat release capacity can be changed in many ways, one of which is to increase the heat exchange area, for example, by setting fins on the outside of the condensing end. The more fins are set, the greater the heat exchange capacity is, and the fewer fins are set, the smaller the heat exchange capacity is. Or it can be achieved by the diameter of the pipe at the condensing end. The larger the pipe diameter, the larger the external heat exchange area, and the smaller the pipe diameter, the smaller the external heat exchange area.

[0035] As an improvement, the total heat release capacity of the condensing ends of all the heat pipes remains unchanged. By reasonably allocating the heat release capacity of different heat pipes while keeping the total heat release capacity unchanged, the heat exchange efficiency is improved while keeping the cost unchanged.

[0036] Preferably, Figure 1 As shown, the heat source box is arranged horizontally and the heat pipe is arranged vertically.

[0037] Preferably, the depth of the condensation end penetrating into the cold source box is more than 75% of the height of the cold source box.

[0038] Preferably, the cooling source is water or air.

[0039] Preferably, the heat source may be exhaust gas.

[0040] The fluid in the cold source box is water. Along the flow direction of the fluid in the cold source box, the depth of the lower guide plate extending upward gradually increases, and the depth of the upper guide plate extending downward gradually decreases.

[0041] During the research process, it was found that the heat exchange of the guide plate in the cross section in the direction of fluid flow was uneven. As the distance from the inlet increased, the density of the heat exchange liquid in the lower part of the box was large, so the liquid flowed downward, which significantly increased the heat exchange liquid in the lower part. Therefore, it was necessary to design a heat exchange structure for improvement. In the present invention, the height of the upper guide plate and the lower guide plate changes along the flow direction of the fluid, so that the liquid in the cold source box gradually moves closer to the center as it flows, so that the heat exchange tubes around the shell and tube center strengthen the heat exchange, which changes the previous heat exchange method, enhances the heat exchange efficiency at different positions, makes the heat exchange uniform on the whole, and further achieves the purpose of enhancing heat transfer.

[0042] As an improvement, along the flow direction of the fluid in the cold source box, the depth of the lower guide plate extending upward gradually increases, and the depth of the upper guide plate extending downward gradually decreases. Through the above-mentioned changes in amplitude, the overall heat exchange can be further uniform, further achieving the purpose of enhancing heat transfer.

[0043] As an improvement, when the heat release capacity of the condensation end gradually increases along the direction from the inlet to the outlet of the cold source box 2, the spacing of the condensation ends increases continuously from the inlet of the cold source box to the middle position of the cold source box along the flow direction of the fluid in the cold source box. Then, from the middle position of the cold source box to the outlet of the cold source box, the spacing of the condensation ends decreases continuously. Because the heat exchange of the condensation end and the cold source per unit length along the flow process of the fluid is relatively uniform in the process close to the countercurrent, so that the overall heat exchange effect is the best. However, it is found in experiments and simulations that the heat exchange of the middle part is significantly greater than the heat exchange of the inlet and outlet. Therefore, the heat exchange area between the cold source box fluid and the condensation end is also changed by changing the spacing of the condensation end. Therefore, the uneven heat exchange is compensated by the change of area, so as to further improve the heat exchange efficiency.

[0044] As an improvement, along the flow direction of the fluid in the cold source box, from the cold source box inlet to the middle of the cold source box, the amplitude of the increasing distance at the condensation end increases continuously. Then, from the middle of the cold source box to the cold source box outlet, the amplitude of the decreasing distance at the condensation end decreases continuously. The above amplitude changes can make the heat exchange per unit length of the entire cold source movement more uniform, further improving the heat exchange efficiency.

[0045] As an improvement, the heat pipes are arranged in rows along the fluid flow direction and in columns perpendicular to the fluid flow direction. Figure 1 From left to right in the middle are rows, Figure 2 The cross-sectional direction of the cold source box is a row. There are multiple heat pipes in each row and multiple heat pipes in each column. By setting multiple heat pipes in each column, more heat pipes can be arranged to further improve the heat exchange efficiency.

[0046] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A heat pipe heat exchanger for controlling the change of heat release capacity of the condensing end, comprising a heat pipe, a heat source box and a cold source box, wherein the heat pipe comprises an evaporation end and a condensation end, the evaporation end is arranged in the heat source box, the condensation end is arranged in the cold source box, the heat source box is located at the upper part, and the cold source box is located at the lower part; the cold source box comprises a cold source inlet and a cold source outlet, characterized in that The depth of the condensation end penetrating into the cold source box is 50%-95% of the height of the cold source box, a guide plate is arranged in the cold source box, and a guide plate is arranged between two adjacent condensation ends; the guide plate includes an upper guide plate and a lower guide plate, the upper guide plate extends from the upper part of the cold source box to the center of the cold source box, and the lower guide plate extends from the lower part of the cold source box to the center of the cold source box, and the upper guide plate and the lower guide plate are arranged at intervals; along the direction from the inlet to the outlet of the cold source box, the heat release capacity of the condensation end gradually increases; along the direction from the inlet to the outlet of the cold source box, the amplitude of the gradual increase of the heat release capacity of the condensation end continues to increase; when the heat release capacity of the condensation end gradually increases along the direction from the inlet to the outlet of the cold source box, the spacing of the condensation ends from the inlet of the cold source box to the middle position of the cold source box along the flow direction of the fluid in the cold source box increases continuously; then from the middle position of the cold source box to the outlet of the cold source box, the spacing of the condensation ends decreases continuously.

2. The heat pipe heat exchanger according to claim 1, characterized in that: The depth of the guide plate extending to the cold source box is 70-85% of the height of the cold source box.

3. The heat pipe heat exchanger according to claim 1, characterized in that: The cold source inlet is arranged at the lower end of the left side of the cold source box body, and the cold source outlet is arranged at the upper part of the right side of the cold source box body.

4. The heat pipe heat exchanger according to claim 3, characterized in that: The guide plate close to the cold source inlet is the lower guide plate, and the guide plate close to the cold source outlet is the upper guide plate.

5. The heat pipe heat exchanger according to claim 1, characterized in that: The heat source box is arranged in a horizontal direction, and the heat pipe is arranged in a vertical direction.

6. The heat pipe heat exchanger according to claim 1, characterized in that: The depth of the condensation end penetrating into the cold source box body is more than 75% of the height of the cold source box body.

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