A normal temperature evaporative radiator

Abstract

The present invention discloses a normal temperature evaporative radiator, including an evaporation chamber and a cooling chamber, wherein the evaporation chamber is filled with evaporative liquid, a mounting hole is provided in the evaporation chamber, and the mounting hole is connected to a compressed air source through a built-in air path; the mounting hole is connected to the bottom of a working nozzle, a gradually expanding diffuser section is provided above the working nozzle, the inner diameter of the working nozzle matches the inner diameter of the reduced end of the diffuser section, a gap is left between the working nozzle and the reduced end of the diffuser section, the gap is connected to the air layer of the evaporation chamber, and the expanded end of the diffuser section is connected to the external environment; the evaporation chamber, the working nozzle, and the diffuser section are coaxial; the cooling chamber is connected to a liquid cooling circuit; wherein the fluids between the evaporation chamber and the cooling chamber are not intercommunication, but heat transfer can be performed. The present invention can achieve a higher heat exchange efficiency at a lower temperature difference between cold and hot fluids, meet the cooling cycle requirements near the indoor normal temperature, and at the same time, has a simple structure and high integration.

Description

Technical Field

[0001] The invention belongs to the technical field of heat transfer engineering and relates to a normal temperature evaporative radiator. Background Art

[0002] As the performance of high-power precision electronic devices / sensors is improved, their power consumption is increasing, and their corresponding heat dissipation power is constantly increasing. In order to ensure their stable working performance and long-term continuous working ability, very strict requirements are placed on the precision temperature control and cooling technology of the equipment, especially for some special temperature-sensitive sensors or actuators, whose optimal operating temperature is in an extremely narrow temperature range near the indoor room temperature. Therefore, an environmental control system that can meet higher precision temperature control and greater heat load impact in a normal temperature environment is required.

[0003] At present, for environmental control systems with large heat dissipation power, liquid cooling circulation is mainly used to achieve heat transfer and exchange. However, the existing heat exchangers are limited by the cooling capacity adjustment rate of the refrigeration equipment, and the temperature fluctuates greatly when the heat load fluctuates greatly. For the large heat storage technology used in some equipment, a large cold storage tank is added to increase the instantaneous peak heat absorption of the heat exchanger. However, in the engineering application process, there are problems such as the large size of the entire system equipment and the lower the heat exchange efficiency as the temperature difference between the cold and hot fluids is smaller. The emergence of these problems is mainly affected by the poor heat exchange performance of the existing heat exchange device at temperatures near the indoor normal temperature. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a room temperature evaporative radiator, which can achieve higher heat exchange efficiency under lower temperature difference between cold and hot fluids, meet the cooling cycle requirements near indoor room temperature, and at the same time has simple structure and high integration, thus solving the problems existing in the prior art.

[0005] The technical solution adopted by the present invention is a normal temperature evaporative radiator, comprising

[0006] An evaporation chamber, wherein the evaporation liquid is filled in the evaporation chamber, and a mounting hole is provided in the evaporation chamber, and the mounting hole is connected to a compressed air source through a built-in air path; the mounting hole is communicated with the bottom of a working nozzle, and a gradually expanding diffuser section is provided above the working nozzle, and the inner diameter of the working nozzle matches the inner diameter of the reduced end of the diffuser section, and a gap is left between the working nozzle and the reduced end of the diffuser section, and the gap is communicated with the air layer of the evaporation chamber, and the expanded end of the diffuser section is communicated with the external environment; the evaporation chamber, the working nozzle, and the diffuser section are coaxial; and

[0007] A cooling cavity connected to a liquid cooling circuit;

[0008] The fluids between the evaporation chamber and the cooling chamber are not intercommunication, but heat transfer can be performed.

[0009] Furthermore, heat-conducting fins are provided in the evaporation cavity to enhance heat transfer between the evaporation cavity and the cooling cavity; and the outlet of the working nozzle is higher than all the heat-conducting fins in the evaporation cavity.

[0010] Furthermore, the heat conducting fins are arranged in concentric rings, and each concentric ring is provided with a plurality of disconnected gaps to form radial channels, so that the evaporating liquid entering the evaporation cavity is evenly distributed at the bottom of the evaporation cavity to immerse the heat conducting fins.

[0011] Furthermore, the heat-conducting fins are open honeycomb or mesh structures.

[0012] Furthermore, an evaporation chamber cover plate is provided on the top surface of the evaporation chamber, and a diffuser section cover plate is provided on the top of the diffuser section. The diffuser section cover plate converts the axial airflow into annular exhaust through a central guide structure.

[0013] Furthermore, the guide structure includes

[0014] An annular boss surrounds the enlarged end of the diffuser section and is higher than the evaporation chamber cover plate. The edge of the annular boss is evenly provided with multiple through holes and multiple radially extending guide plates along the circumferential direction. The through holes and the guide plates are distributed at intervals and are used to change the direction of the airflow from the original axial flow to discharge along the radial four sides.

[0015] Furthermore, a cooling channel is provided in the cooling cavity to enhance heat transfer between the evaporation cavity and the cooling cavity.

[0016] Furthermore, the cooling channel is a planar spiral structure with the center of the spiral structure disconnected; or the cooling channel is an open metal honeycomb core, a tree-branch type channel, a U-shaped channel, an S-shaped channel or a lattice spoiler structure.

[0017] Furthermore, the evaporation chamber and the cooling chamber are integrated in the heat exchange shell; the heat exchange shell peripheral wall is provided at the relative position

[0018] The cooling channel inlet joint and the cooling channel outlet joint are respectively connected to the inlet and outlet of the cooling cavity;

[0019] The air inlet connector is used to connect a compressed air source to a radially arranged built-in air path.

[0020] Furthermore, the peripheral wall of the heat exchange shell is provided with

[0021] An evaporating liquid injection joint is connected to the evaporating chamber and is used to inject evaporating liquid into the evaporating chamber;

[0022] Liquid level switch, used to monitor the height of the evaporating liquid;

[0023] The installation port of the pressure transmitter is used to install the pressure transmitter for accurately detecting the vacuum degree in the evaporation chamber;

[0024] Wherein, a solenoid valve is installed in the evaporative liquid injection joint, and a liquid level switch is electrically connected to the solenoid valve for controlling the amount of evaporative liquid in the evaporation chamber.

[0025] The beneficial effects of the present invention are:

[0026] (1) Since the latent heat of vaporization of the evaporating liquid is much larger than its specific heat capacity, it can maintain the boiling point temperature to effectively cope with the input heat fluctuations brought by the hot fluid. After heat exchange, it can ensure that the temperature of the hot fluid in the cooling channel remains at a relatively constant temperature after sufficient heat exchange.

[0027] (2) Since the evaporating liquid absorbs heat by boiling, the steam is directly discharged into the atmosphere, with high heat dissipation and heat exchange efficiency, and the heat exchange capacity per unit volume of the cooler is large.

[0028] (3) The nozzle and diffuser section integrated inside the room temperature evaporative radiator of the present invention will form a Venturi effect after the compressed air is introduced, thereby achieving a vacuum environment and a large exhaust volume. The overall structure is highly compact, has no moving parts, and requires no maintenance. The room temperature evaporative radiator is a modular structure, which is easy to achieve standardized production and has good engineering practicality. The flat structure is suitable for modular stacking, and can form a large array cooling system with different cooling capacities by simply increasing the number of installations.

[0029] (4) Compared with the existing normal temperature evaporative radiator that directly uses a vacuum air source, the present invention uses compressed air as the air source. The load capacity is stronger when the high-pressure pipeline is used for air supply. It can realize multiple modules in series or parallel air supply, which greatly reduces the construction cost of the peripheral pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a schematic structural diagram of a normal temperature evaporative cooler according to an embodiment of the present invention.

[0032] Figure 2 It is a schematic diagram of the internal cross-section of a normal temperature evaporative cooler according to an embodiment of the present invention.

[0033] Figure 3 Schematic diagram of the structure of the evaporation chamber in an embodiment of the present invention.

[0034] Figure 4Schematic diagram of the structure of the cooling cavity in an embodiment of the present invention.

[0035] Figure 5 Schematic diagram of the structure of the diffuser cover plate in an embodiment of the present invention.

[0036] In the figure, 01. heat exchange shell, 0101. heat conducting fins, 0102. evaporation chamber, 0103. cooling channel, 0104. built-in gas path, 0105. working nozzle, 0106. mounting hole, 02. evaporation chamber cover, 0201. diffuser section, 03. cooling channel cover, 04. diffuser section cover, 041. guide structure, 0411. annular boss, 0412. guide plate, 05. connecting bolt, 06. pressure transmitter, 07. cooling channel inlet joint, 08. evaporating liquid injection joint, 09. solenoid valve, 10. liquid level switch, 11. cooling channel outlet joint, 12. air intake regulating valve, 13. air intake joint. DETAILED DESCRIPTION

[0037] The following will be combined with 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 making creative work are within the scope of protection of the present invention.

[0038] Embodiment 1,

[0039] A normal temperature evaporative radiator, such as Figure 1-2 As shown, it includes an evaporation chamber 0102 and a cooling chamber. The evaporation chamber 0102 and the cooling chamber are integrated in the heat exchange shell 01. The evaporation chamber 0102 is located in the upper layer, and the cooling chamber is located in the lower layer. The fluids between the evaporation chamber 0102 and the cooling chamber are not intercommunication, but heat transfer can be performed.

[0040] The evaporation chamber 0102 is filled with evaporation liquid, and a mounting hole 0106 is provided in the center of the evaporation chamber 0102, and the mounting hole 0106 is connected to the compressed air source through the built-in air path 0104; the top of the mounting hole 0106 is connected to the working nozzle 0105, and a gradually expanding diffuser section 0201 is provided above the working nozzle 0105, and the inner diameter of the working nozzle 0105 matches the inner diameter of the reduced end of the diffuser section 0201, and a gap is left between the working nozzle 0105 and the reduced end of the diffuser section 0201, and the gap is close to the evaporation chamber. The air layer of the evaporation chamber 0102 is connected, and the expanded end of the diffuser section 0201 is connected to the external environment; the evaporation chamber 0102, the working nozzle 0105, and the diffuser section 0201 are coaxial, and the compressed air enters along the built-in air path 0104 and is ejected from the working nozzle 0105 at high speed. When the high-speed airflow flows in the diffuser section 0201, a Venturi effect will be formed, so that the air in the evaporation chamber 0102 is sucked away from the gap between the working nozzle 0105 and the reduced end of the diffuser section 0201, and a vacuum is formed in the evaporation chamber 0102. According to the vacuum degree corresponding to the volume of the evaporation chamber 0102 and the evaporation temperature, the key parameters such as the outlet size of the working nozzle 0105, the compressed air pressure and the consumption are obtained according to the Venturi formula, so as to adjust the vacuum degree. The mounting hole 0106 is used to separate the working nozzle 0105. The working nozzle 0105 requires high processing precision, while the mounting hole 0106 has low processing precision. After separation, the processing difficulty can be effectively reduced and the cost can be reduced.

[0041] The evaporation chamber 0102 is provided with heat-conducting fins 0101, which increases the heat exchange area, enhances the heat transfer between the evaporation chamber 0102 and the cooling chamber, and improves the heat exchange efficiency; the outlet of the working nozzle 0105 is higher than all the heat-conducting fins 0101 in the evaporation chamber 0102, in order to prevent the evaporation liquid that immerses the heat-conducting fins 0101 from flowing into the working nozzle 0105, thereby ensuring the vacuum environment in the evaporation chamber 0102.

[0042] The cooling cavity is connected to the liquid cooling circuit; a cooling channel 0103 is provided in the cooling cavity to enhance the heat transfer between the evaporation cavity 0102 and the cooling cavity.

[0043] In some embodiments, Figure 3 As shown, the heat-conducting fins 0101 are arranged in concentric rings, and each concentric ring is provided with a plurality of disconnected gaps to form a radial channel, so that the evaporation liquid entering the evaporation cavity 0102 is evenly distributed at the bottom of the evaporation cavity 0102, submerging the heat-conducting fins 0101. Alternatively, the heat-conducting fins 0101 are open honeycomb, mesh or other structures that increase the heat exchange area.

[0044] An evaporation chamber cover plate 02 is provided on the top surface of the evaporation chamber 0102, and a diffuser section cover plate 04 is provided on the top of the diffuser section 0201. The diffuser section cover plate 04 converts the axial airflow into annular exhaust through a central guide structure 041.

[0045] like Figure 5 As shown, the guide structure 041 includes an annular boss 0411, which surrounds the enlarged end of the diffuser section 0201 and is higher than the evaporation chamber cover plate 02. The edge of the annular boss 0411 is evenly provided with multiple through holes and multiple radially extending guide plates 0412 along the circumferential direction. The upper surface of the guide plate 0412 is an arc transition structure to reduce flow resistance and improve vacuum generation efficiency. The through holes and the guide plates 0412 are spaced apart to change the direction of the airflow from the original axial flow to radial discharge around. When multiple coolers are stacked in multiple layers, the upper and lower adjacent coolers will not block each other's exhaust channel, reducing exhaust resistance.

[0046] In some embodiments, Figure 4 As shown, the cooling channel 0103 is a planar spiral structure, and the center of the spiral structure is disconnected; or the cooling channel 0103 is an open metal honeycomb core, a tree-branched channel, a U-shaped channel, an S-shaped channel, a lattice spoiler structure or other structures that increase the heat exchange area and the degree of fluid turbulence. The function is to increase the heat exchange area and turbulence of the fluid, enhance the heat transfer between the evaporation cavity 0102 and the cooling cavity, and thus improve the heat exchange efficiency. Without affecting the circulation of the liquid, the larger the heat exchange area, the higher the efficiency.

[0047] A cooling channel inlet joint 07, a cooling channel outlet joint 11 and an air intake joint 13 are provided at positions relative to the circumferential wall of the heat exchange shell 01. The cooling channel inlet joint 07 and the cooling channel outlet joint 11 are respectively connected to the inlet and outlet of the cooling channel 0103 in the cooling cavity; the air intake joint 13 is used to connect the compressed air source with the built-in air path 0104 arranged along the radial direction, and an air intake regulating valve 12 is installed inside the air intake joint 13 for adjusting the air intake volume.

[0048] The peripheral wall of the heat exchange shell 01 is also provided with an evaporating liquid injection joint 08, a liquid level switch 10, and an installation port for a pressure transmitter 06. The evaporating liquid injection joint 08 is connected to the evaporating cavity 0102 and is used to inject evaporating liquid into the evaporating cavity 0102; the liquid level switch 10 is used to monitor the liquid level of the evaporating liquid; the installation port of the pressure transmitter 06 is used to install the pressure transmitter 06 for detecting the vacuum degree in the evaporating cavity 0102, so as to accurately control the evaporation temperature. Among them, a solenoid valve 09 is installed in the evaporating liquid injection joint 08, and the liquid level switch 10 is electrically connected to the solenoid valve 09 to control the amount of evaporating liquid in the evaporating cavity 0102; if the liquid level switch 10 detects that the evaporating liquid level fails to immerse the heat-conducting fins 0101, the solenoid valve 09 is opened to replenish the evaporating liquid to ensure that the evaporating liquid always immerses the heat-conducting fins 0101.

[0049] The upper layer and the lower layer of the heat exchange shell 01 are fixedly connected, and can be connected by means of threading or welding to ensure sealing; the evaporation chamber cover plate 02 is coaxially installed with the heat exchange shell 01 through the connecting bolts 05, and the bottom of the cooling channel 0103 is sealed by welding the cooling channel cover plate 03 to ensure that the connected liquid cooling circuit is leak-free.

[0050] The heat exchange shell 01 requires that each layer structure of the plane layer be designed as required, and there is no special requirement for the overall plane shape.

[0051] The working process of the embodiment of the present invention is as follows:

[0052] Before use, the room temperature evaporative radiator in Example 1 is fixed and installed horizontally, and the evaporative liquid is injected from the evaporative liquid injection joint 08. The liquid level switch 10 monitors the height of the evaporative liquid, and the amount of addition is controlled by the solenoid valve 09 so that the evaporative liquid level just immerses the heat-conducting fins 0101 in the evaporation cavity 0102; the air inlet joint 13 is connected to compressed air, and the air intake regulating valve 12 is used to control the air intake amount to adjust the vacuum degree in the evaporation cavity 0102.

[0053] When in use, the cooling channel inlet connector 07 and the cooling channel outlet connector 11 of the normal temperature evaporative radiator in Example 1 are connected to the liquid cooling circuit, and the vacuum degree in the evaporation chamber 0102 is adjusted according to the cooling temperature so that the evaporation temperature of the evaporating liquid is equal to the cooling temperature (for example, the boiling point of water is related to the vacuum degree, and calculated by absolute pressure, the boiling point of water is about 7°C at 1kpa; the boiling point of water is about 46°C at 10kpa; and the boiling point of water is about 100°C at 100kpa).

[0054] During operation, when the temperature of the liquid cooling circuit is higher than the cooling temperature, the evaporative liquid begins to evaporate in the evaporation chamber 0102, forming water vapor containing a large amount of heat, and the Venturi effect generated by the flow of compressed air between the working nozzle 0105 and the diffuser section 0201 will form a vacuum environment, sucking the water vapor from the gap between the two and discharging it to the external atmosphere through the guide structure. The vacuum environment generated by the Venturi effect is stable and lasting with a large exhaust volume, so that the evaporative liquid can evaporate continuously in the evaporation chamber 0102, and high-efficiency cooling can be achieved for a long time.

[0055] The embodiment of the present invention utilizes the correlation between the boiling point of the liquid and the air pressure to change the internal pressure of the ventilator, so that the temperature of the evaporating liquid is always maintained at the boiling point, achieving constant temperature maintenance. When the hot fluid flows through, it can continuously and stably exchange heat with high heat exchange efficiency. The hot fluid exchanges heat with the evaporating liquid in a boiling manner, and the cold fluid exchanges heat with the evaporating liquid vapor in a condensing manner. It can achieve a higher heat exchange efficiency at a lower temperature difference between the cold and hot fluids, meeting the cooling cycle requirements near the indoor normal temperature.

[0056] In addition, the nozzle and diffuser section integrated inside the room temperature evaporative radiator of the embodiment of the present invention will form a Venturi effect after the compressed air is introduced, thereby realizing a vacuum environment and a large exhaust volume. The integrated integration can adjust the vacuum degree in the evaporation chamber 0102 and take away the evaporated steam at the same time. It has good engineering practicality and compact structure. The flat structure is suitable for independent modular stacking and can form a large array cooling system with good installation flexibility. In addition, the use of unit modules with standard structure can simplify the production process, and the single component type brings about a reduction in production cost. The cooling power can be adjusted by simply increasing the number, thereby adapting to different cooling needs and greatly reducing the cost of use.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A normal temperature evaporative radiator, characterized in that: include: An evaporation chamber (0102), wherein the evaporation chamber (0102) is filled with evaporation liquid, wherein a mounting hole (0106) is provided in the evaporation chamber (0102), and the mounting hole (0106) is connected to a compressed air source via a built-in air path (0104); the mounting hole (0106) is connected to the bottom of a working nozzle (0105), and a gradually expanding diffuser section (0201) is provided above the working nozzle (0105); the inner diameter of the working nozzle (0105) matches the inner diameter of the reduced end of the diffuser section (0201), and a gap is left between the working nozzle (0105) and the reduced end of the diffuser section (0201), and the gap is connected to the air layer of the evaporation chamber (0102), and the expanded end of the diffuser section (0201) is connected to the external environment; the evaporation chamber (0102), the working nozzle (0105), and the diffuser section (0201) are coaxial; and A cooling cavity connected to a liquid cooling circuit; Wherein, the fluids between the evaporation cavity (0102) and the cooling cavity are not intercommunication, but heat transfer can be performed; The evaporation cavity (0102) and the cooling cavity are both integrated in the heat exchange shell (01), the evaporation cavity (0102) is located in the upper layer, and the cooling cavity is located in the lower layer; The peripheral wall surface of the heat exchange shell (01) is provided with: An evaporating liquid injection joint (08) is connected to the evaporating chamber (0102) and is used to inject evaporating liquid into the evaporating chamber (0102); A liquid level switch (10) for monitoring the liquid level of the evaporating liquid; A mounting port of a pressure transmitter (06), used for mounting a pressure transmitter (06) for detecting the vacuum degree in the evaporation chamber (0102); Wherein, a solenoid valve (09) is installed in the evaporating liquid injection joint (08), and a liquid level switch (10) is electrically connected to the solenoid valve (09) for controlling the amount of evaporating liquid in the evaporating chamber (0102).

2. A normal temperature evaporative radiator according to claim 1, characterized in that: The evaporation cavity (0102) is provided with heat-conducting fins (0101) for enhancing heat transfer between the evaporation cavity (0102) and the cooling cavity; the outlet of the working nozzle (0105) is higher than all the heat-conducting fins (0101) in the evaporation cavity (0102).

3. A normal temperature evaporative radiator according to claim 2, characterized in that: The heat-conducting fins (0101) are arranged in concentric rings, and each concentric ring is provided with a plurality of disconnected gaps to form a radial channel, so that the evaporating liquid entering the evaporating cavity (0102) is evenly distributed at the bottom of the evaporating cavity (0102) to immerse the heat-conducting fins (0101).

4. A normal temperature evaporative radiator according to claim 2, characterized in that: The heat-conducting fins (0101) are open honeycomb or mesh structures.

5. The normal temperature evaporative radiator according to claim 1, characterized in that: The top surface of the evaporation chamber (0102) is provided with an evaporation chamber cover plate (02), and the top of the diffuser section (0201) is provided with a diffuser section cover plate (04), and the diffuser section cover plate (04) converts the axial airflow into annular exhaust through a central guide structure (041).

6. A normal temperature evaporative radiator according to claim 5, characterized in that: The guide structure (041) comprises: An annular boss (0411), the annular boss (0411) surrounds the enlarged end of the diffuser section (0201) and is higher than the evaporation chamber cover plate (02), the edge of the annular boss (0411) is evenly provided with a plurality of through holes and a plurality of radially extending guide plates (0412) along the circumferential direction, the through holes and the guide plates (0412) are arranged at intervals, and are used to change the direction of the airflow from the original axial flow to discharge along the radial periphery.

7. The normal temperature evaporative radiator according to claim 1, characterized in that: A cooling channel (0103) is provided in the cooling cavity, which is used to enhance heat transfer between the evaporation cavity (0102) and the cooling cavity.

8. A normal temperature evaporative radiator according to claim 7, characterized in that: The cooling channel (0103) is a planar spiral structure, and the center of the spiral structure is disconnected; or the cooling channel (0103) is an open metal honeycomb core, a tree-branch type channel, a U-shaped channel, an S-shaped channel or a lattice spoiler structure.

9. The normal temperature evaporative radiator according to claim 1, characterized in that: The heat exchange shell (01) is provided with: A cooling channel inlet joint (07) and a cooling channel outlet joint (11), wherein the cooling channel inlet joint (07) and the cooling channel outlet joint (11) are respectively connected to the inlet and the outlet of the cooling cavity; The air inlet connector (13) is used to connect a compressed air source to a built-in air path (0104) arranged in a radial direction.

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