CN114704891A

CN114704891A - Portable air conditioner

Info

Publication number: CN114704891A
Application number: CN202210312514.5A
Authority: CN
Inventors: 王伟; 马珂; 左正兴
Original assignee: Beijing Institute of Technology BIT
Current assignee: Beijing Institute of Technology BIT
Priority date: 2022-03-28
Filing date: 2022-03-28
Publication date: 2022-07-05
Anticipated expiration: 2042-03-28
Also published as: CN114704891B

Abstract

The invention discloses a portable air conditioner, and belongs to the field of human body thermal management. The invention comprises an air supply unit, a heat exchange unit and a mode switching unit. The air supply unit comprises an air inlet fan, a fan cover, a guide plate and an air supply outlet. The ambient air enters the air supply unit through the air inlet fan, and is completely sent into the heat exchange unit under the action of the guide plate; the fan cover is arranged inside the air supply unit and is prevented from being polluted by dust in the environment. The heat exchange unit comprises a thermoelectric sheet, two plate-fin radiators, a heat dissipation part and a heat insulation layer. The invention can realize double-effect adjustment of cold and hot air, provides two methods for converting cold and hot air of the thermoelectric air conditioner, can easily switch the refrigeration/heating functions by the mode switching unit without changing the current direction, and is more reliable by adopting a mechanical method. The invention has simple structure, strong portability, quick and easy implementation, higher reliability of the related all-solid-state refrigeration mode, no pollution and low noise.

Description

Portable air conditioner

Technical Field

The invention relates to a portable air conditioner, and belongs to the field of human body thermal management.

Background

In recent years, the temperature of global high-temperature weather is rising continuously, and summer is faster than the coming and going. In hot summer, people feel very dry heat outdoors. At present, a portable small fan is provided for outdoor cooling and heat relieving products. However, the cooling mode adopted by the device belongs to passive refrigeration, and the cooling performance is very limited.

Among the current active refrigeration modes, namely magnetic refrigeration, vapor compression refrigeration, acoustic refrigeration and the like, the thermoelectric refrigeration chip is more prominent in size, refrigeration effect and cost. Based on the design, the portable active refrigeration air conditioner provides a portable thermal comfort product for people in a high-temperature environment.

Disclosure of Invention

The invention mainly aims to provide a portable air conditioner which can establish a proper human-shaped microenvironment around a human body and realize heat exchange of the human body by changing the temperature of the microenvironment.

The purpose of the invention is realized by the following technical scheme;

the invention discloses a portable air conditioner which comprises an air supply unit, a heat exchange unit and a mode switching unit.

The air supply unit comprises an air inlet fan, a fan cover, a guide plate and an air supply outlet. The ambient air enters the air supply unit through the air inlet fan, and is completely sent to the heat exchange unit under the action of the guide plate; the fan cover is arranged inside the air supply unit and is prevented from being polluted by dust in the environment.

The heat exchange unit comprises a thermoelectric sheet, two plate-fin radiators, a heat dissipation part and a heat insulation layer.

The first heat dissipation component is a heat dissipation fan; the thermoelectric piece is positioned between the two plate-fin radiators, and is fixedly connected by adopting heat-conducting silicone grease to reduce the influence of contact thermal resistance; for the short circuit problem of avoiding cold and hot air current, utilize the insulating layer to fill in the middle of two plate-fin radiators, be about to the thermoelectric piece inlay in the middle of the insulating layer. When an external power supply is connected, the thermoelectric chip starts to refrigerate, external air horizontally enters the plate-fin type radiator to exchange heat, and the heat-radiating fan positioned in the vertical direction of the thermoelectric chip exhausts the air after heat exchange of the hot-end plate-fin type radiator to the environment.

Case two the heat dissipating component is a heat pipe heat sink; the heat pipe radiator consists of a heat pipe and a heat pipe clamp. The thermoelectric piece is positioned below a plate-fin radiator at the moment, is also embedded into the heat insulation layer and is adhered by utilizing heat conduction silicone grease; the other end of the thermoelectric piece is guided to the lower part of the other aluminum plate-fin radiator by a heat pipe radiator, and the cold part and the hot part are separated by a heat insulation layer between the two plate-fin radiators. When an external power supply is connected, the thermoelectric piece starts to refrigerate, heat at the other end of the thermoelectric piece is led to the other plate-fin radiator by the heat pipe to exchange heat, external air horizontally enters the radiator and then is shunted, and a part of the air is refrigerated and discharged from the air supply outlet; and a part of the heat dissipation is discharged through the side sealing.

Preferably, the material of the plate-fin heat radiator is aluminum.

Preferably, the material of the heat insulation layer is a low thermal conductivity material such as epoxy resin.

Preferably, the mode switching means can switch the cooling and heating functions mechanically.

For case one, the mode switching unit includes a ratchet group and a pawl group; the ratchet wheel set comprises a first ratchet wheel and a second ratchet wheel; the pawl set comprises a button, a return spring and gear teeth; the first ratchet wheel is fixed on the sleeve outside the heat exchange unit, and a second ratchet wheel is meshed with the first ratchet wheel and fixed on the sleeve inside the heat exchange unit; the mode switching unit is positioned between the air supply unit and the heat exchange unit. And when the mode is switched, the outer sleeve of the heat exchange unit is rotated.

Aiming at the second condition, the mode switching unit comprises a valve, a ratchet group and a side air port; the valve consists of a knob and a valve body, and the knob is fixed on the valve body; the ratchet group comprises a driving ratchet wheel, a driven ratchet wheel, an internal sliding block, a rack and a valve, the driving ratchet wheel is fixed on the knob, the driven ratchet wheel is fixed on the device shell, the internal sliding block is fixed in a sliding groove of the driven ratchet wheel, a gear of the rack and the gear group is fixed on the internal sliding block, and the rack is arranged in two grooves which are fixed on the device shell; the side tuyere comprises an empty groove and a side valve body.

The working method of the portable air conditioner disclosed by the invention comprises the following steps: when the outdoor environment temperature is higher, the device has a refrigeration function, a power supply is switched on, and the thermoelectric refrigeration piece, the air inlet fan and the heat dissipation part start to work. The two ends of the thermoelectric refrigeration piece generate cold-hot temperature difference, the cold end is used for cooling ambient air sucked by the air inlet fan, the ambient air enters the heat exchange unit to complete heat exchange, and then is blown to a human body through the air supply outlet, so that the ambient temperature near the human body is reduced, and the requirement of thermal comfort of the human body is met; the heat dissipation part can remove the heat at the hot end, so that the cooling performance can be improved. When the outdoor environment temperature is lower, the mode conversion unit is rotated, and the heating function can be realized.

Advantageous effects

1. The invention discloses a portable air conditioner, which adopts a thermoelectric refrigerating sheet as a refrigerating source, can realize double-effect cold and hot regulation, and designs a new wind direction conversion device, compared with the traditional current polarity conversion, the invention provides two thermoelectric air conditioner cold and hot wind conversion methods, the refrigerating/heating functions can be easily switched by a mode switching unit instead of changing the current direction, a mechanical method is adopted, the reliability is higher, and the device circuit can be simplified;

2. according to the portable air conditioner disclosed by the invention, the temperature ranges of the refrigeration and heating of the portable air conditioner are large due to the adoption of an active refrigeration mode, and the refrigeration and heating effects of the portable air conditioner are better compared with a passive heat dissipation mode of an existing portable fan; the temperature of the microenvironment of the human body can be adjusted, real-time temperature adjustment can be realized by adopting power control, the refrigeration/heating functions can be realized simultaneously, and the uncomfortable feeling of the human body caused by outdoor high/low temperature weather is greatly relieved;

3. according to the portable air conditioner disclosed by the invention, the directions of cold air flow and hot air flow are different, and the phenomenon of short circuit of air flow is obviously reduced.

4. The portable air conditioner disclosed by the invention adopts the thermoelectric refrigerating sheet, the size is only 40 × 3.8mm, the volume of the whole air conditioner is greatly reduced, the portability is strong, the power supply controls the portable air conditioner to implement a quick refrigerating/heating function, and the related all-solid-state refrigerating mode has higher reliability, no pollution and low noise;

drawings

FIG. 1 is an external view of example 1;

FIG. 2 is a rear view of embodiment 1;

FIG. 3 is a schematic view of an internal heat exchange unit of embodiment 1;

FIG. 4 is a schematic diagram of a mode switching unit;

FIG. 5 is a schematic view of the connection of the intake fan and the valve;

FIG. 6 is an external view of embodiment 2;

FIG. 7 is an internal view of embodiment 2;

FIG. 8 is a bottom schematic view of example 2;

FIG. 9 is a schematic side view of example 2;

FIG. 10 is a schematic view of the position of a thermoelectric chip in example 2.

FIG. 11 is a graph showing simulation results of example 1

Wherein, 1-an air inlet fan, 2-an air outlet, 3-a heat radiation fan, 4-a heat radiator, 4-1-a first heat radiator, 4-2-a second heat radiator, 5-a ratchet wheel group, 5-1-a first ratchet wheel, 5-2-a second ratchet wheel, 5-3-a pawl group, 5-3-1-a gear tooth, 5-3-2-a reset spring, 5-3-a button, 6-a device shell, 7-an air supply unit shell, 7-1-an outer sleeve, 7-2-an inner sleeve, 8-a thermoelectric sheet, 9-a heat insulation layer, 10-a valve, 10-1-a valve body, 10-2-a knob, 11-a ratchet wheel group, 11-1-a valve, 11-2-a gear, 11-3-a driven ratchet wheel, 11-4-a slide block, 11-5-a driving ratchet wheel, 11-6-rack, 12-side air port, 12-1-first side seal, 12-2-second side seal, 12-2-1-empty groove, 12-2-2-side valve body, 13-heat pipe radiator, 13-1-heat pipe, and 13-2-clamp.

Detailed Description

The core component of the invention is a thermoelectric piece, and when the thermoelectric piece is connected with an external power supply, the inner end and the outer end of the thermoelectric piece generate temperature difference. Due to the active refrigeration mode, the appropriate body surface temperature required by the thermal comfort of the human body can be achieved by utilizing the refrigeration principle.

For a thermoelectric device, two traditional structures are provided, one is a symmetrical structure, and the other is a heat-conducting structure; in the symmetrical type, that is, embodiment 1 of the present invention, as shown in fig. 5, the thermoelectric sheet is located between two aluminum radiators, and the two radiators and the thermoelectric sheet are located on the same vertical plane; in the heat-drawing type, as shown in fig. 10, that is, in embodiment 2 of the present invention, a thermoelectric chip is located at the bottom of one of the first heat sinks, and the other end of the thermoelectric chip draws heat into the bottom of a second heat sink at the same level as the first heat sink by means of a heat pipe.

Embodiments of the invention are further described below with reference to the accompanying drawings.

Example 1: fig. 1 is an external view of embodiment 1, which includes an air supply unit, a heat exchange unit, and a mode switching unit;

the air supply unit consists of an air inlet fan 1 and an air supply outlet 2;

the heat exchange unit comprises a thermoelectric sheet 8, an aluminum plate-fin radiator 4, a heat insulation layer 9 and a heat radiating component;

the heat dissipation part comprises a heat dissipation fan 3, and as shown in fig. 2, the heat dissipation fan 3 is positioned at the rear of the device; the thermoelectric piece 8 is positioned between the two aluminum plate-fin radiators 4, and the heat insulation layer 9 is filled between the two aluminum plate-fin radiators 4, namely, the thermoelectric piece 8 is embedded in the heat insulation layer 9. When an external power supply is connected, the thermoelectric fins 8 start to refrigerate, external air horizontally enters the aluminum plate-fin radiator 4 for heat exchange, and the heat radiation fan 3 located in the vertical direction of the thermoelectric fins 8 discharges the air subjected to heat exchange through the aluminum plate-fin radiator 4 at the hot end to the environment.

The mode switching unit comprises a ratchet group 5; as shown in fig. 4, the ratchet group 5 includes a first ratchet 5-1, a second ratchet 5-2 and a pawl group 5-3; the pawl group 5-3 comprises gear teeth 5-3-1, a return spring 5-3-2 and a button 5-3-3; as shown in fig. 3, the first ratchet 5-1 is fixed on the heat exchange unit outer sleeve 7-1, and is engaged with the second ratchet 5-2, and the second ratchet 5-2 is fixed on the heat exchange unit inner sleeve 7-2; the mode switching unit is positioned between the air supply unit and the heat exchange unit. When the mode is switched, the outer sleeve 7-1 of the heat exchange unit is rotated;

as shown in fig. 2, the radiator 4 is fixed on the heat exchange unit outer sleeve 7-1;

taking a refrigeration mode as an example, ambient air is sucked by the air inlet fan 1, and is exhausted from the air supply outlet 2 after heat exchange of the device, and the heat radiation fan 3 is a suction fan and removes heat at the hot end of the thermoelectric chip.

The air supply fan 1 is positioned at the foremost end of the device, and sucked air can be sent to the heat exchangers at the cold and hot ends of the thermoelectric piece 8; the air sucked by the air supply fan 1 flows into the cold end, can be refrigerated and flows out of the air supply outlet 2; flows into the hot end for heat dissipation, is sucked out by the heat dissipation fan 3 and is discharged from the rear part of the device;

when the cooling mode is switched to the heating mode, the heat exchange unit outer sleeve 7-1 is rotated. The working principle of the mode switching unit is as follows: when the button 5-3-3 is pressed, the return spring 5-3-2 is compressed downwards, the gear teeth 5-3-1 loosen the second ratchet wheel 5-2, the first ratchet wheel 5-1 rotates, when the button rotates 180 degrees anticlockwise, the button 5-3-3 is loosened, and the restoring force of the return spring 5-3-2 enables the ratchet wheel 5-3-1 to reset so as to fix the second ratchet wheel 5-2.

The simulation of the embodiment 1 is carried out by adopting Commol Multiphysics, the model is simplified, and the commercial thermoelectric piece with the model number of TEC1-12706 is adopted to carry out simulation calculation under different thermal environments, and the working voltage of the thermoelectric piece is 8V at the moment. The results are shown in fig. 11, which shows that the air conditioner using the thermoelectric sheet for cooling can meet the requirement of thermal comfort for human body.

Example 2: fig. 6 is an external view of the present embodiment 2, which includes an air blowing unit, a heat exchanging unit, and a mode switching unit. As shown in fig. 10, in this embodiment 2, which is a heat-conducting type air conditioning source, a thermoelectric chip is placed on the bottom of a heat sink 4-1, and is placed below a heat pipe 13-1, the heat pipe 13-1 is placed in a fixture 13-2, and the heat pipe 13-1 introduces heat into the heat sink 4-2.

The air supply unit consists of an air inlet fan 1 and an air supply outlet 2;

the heat dissipation member is a heat pipe radiator 13; the heat pipe radiator 13 is composed of a heat pipe 13-1 and a heat pipe clamp 13-2. The thermoelectric piece 8 is positioned below an aluminum plate-fin radiator 4-1 at the moment, is also embedded into the heat insulation layer 9 and is adhered by utilizing heat conduction silicone grease; the first end of the thermoelectric piece 8 guides heat to the lower part of the second aluminum plate-fin type radiator 4-2 by the heat pipe radiator 13, and the cold and hot parts are separated by the heat insulation layer 9 between the two aluminum plate-fin type radiators 4. When an external power supply is connected, the thermoelectric piece 8 starts to refrigerate, heat at the other end of the thermoelectric piece 8 is led to the other aluminum plate-fin radiator 4 by the heat pipe 13-1 to exchange heat, external air horizontally enters the radiator, is shunted, and a part of the air is refrigerated and is discharged from the air supply outlet 2; a portion of the heat dissipated is removed through side seal 12.

The mode switching unit comprises a valve 10, a ratchet group 11 and a side air port 12; the valve 10 consists of a knob 10-2 and a valve body 10-1, and the knob 10-2 is fixed on the valve body 10-1; the ratchet wheel set 11 comprises a valve 11-1, a gear 11-2, a driven ratchet wheel 11-3, an internal sliding block 11-4, a driving ratchet wheel 11-5 and a rack 11-6, the driving ratchet wheel 11-2 is fixed on a knob 10-2, the driven ratchet wheel 11-3 is fixed on a device shell 6, the internal sliding block 11-4 is fixed in a sliding groove of the driven ratchet wheel 11-3, the gear 11-2 is fixed on the internal sliding block, and the rack 11-6 is arranged in two grooves which are fixed on the device shell 6; as shown in fig. 9, the side tuyere 12 includes a hollow groove 12-2-1 and a side valve body 12-2-2;

in the cooling mode, as shown in fig. 7, the intake fan 1 sucks in the outside air, and the air flows into the inside of the apparatus, passes through the radiator 4, and reaches the air blowing port 2, and at this time, the valve 10-1 rotates clockwise to open the air blowing port 2 (right side). A rotational torque is applied to the knob 10-2. as shown in fig. 8, the active ratchet 11-5 is fixedly coupled to the knob 10-2. The driving ratchet wheel 11-5 is driven to rotate clockwise, the driven ratchet wheel 11-3 is driven to rotate anticlockwise, the inner sliding block 11-4 drives the gear 11-2, the gear 11-2 moves the rack 11-6 leftwards, the side face control air supply door 11-1 is scratched into the empty groove 12-2-1, and the first side face air port 12-1 is closed; similarly, the second side tuyere 12-2 is opened. Similarly, when the function mode is switched, the knob 10-2 is rotated by a counterclockwise moment, so that the valve is rotated rightwards, the first side air opening 12-1 is opened, and the second side air opening 12-2 is closed.

The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A portable air conditioner is characterized in that: the heat exchanger comprises an air supply unit, a heat exchange unit and a mode switching unit;

the air supply unit comprises an air inlet fan, an air cover, a guide plate and an air supply outlet; the ambient air enters the air supply unit through the air inlet fan, and is completely sent to the heat exchange unit under the action of the guide plate; the fan cover is arranged in the air supply unit and is prevented from being polluted by dust in the environment;

the heat exchange unit comprises a thermoelectric sheet, two plate-fin radiators, a heat dissipation part and a heat insulation layer;

the first heat dissipation component is a heat dissipation fan; the thermoelectric piece is positioned between the two plate-fin radiators, and is fixedly connected by adopting heat-conducting silicone grease to reduce the influence of contact thermal resistance; in order to avoid the short circuit problem of cold and hot air flows, a heat insulation layer is filled between the two plate-fin radiators, namely, a thermoelectric piece is embedded in the heat insulation layer; when an external power supply is connected, the thermoelectric chip starts to refrigerate, external air horizontally enters the plate-fin type radiator to exchange heat, and a heat radiation fan positioned in the vertical direction of the thermoelectric chip discharges the air after heat exchange of the hot-end plate-fin type radiator to the environment;

case two the heat dissipating component is a heat pipe heat sink; the heat pipe radiator consists of a heat pipe and a heat pipe clamp; the thermoelectric piece is positioned below a plate-fin radiator at the moment, is also embedded into the heat insulation layer and is adhered by utilizing heat conduction silicone grease; the other end of the thermoelectric piece is guided to the lower part of the other aluminum plate-fin radiator by a heat pipe radiator, and the cold part and the hot part are separated by a heat insulation layer between the two plate-fin radiators; when an external power supply is connected, the thermoelectric piece starts to refrigerate, heat at the other end of the thermoelectric piece is led to the other plate-fin radiator by the heat pipe to exchange heat, external air horizontally enters the radiator and then is shunted, and a part of the air is refrigerated and discharged from the air supply outlet; and a part of the heat dissipation is discharged through the side sealing.

2. The portable air conditioner according to claim 1, wherein: for case one, the mode switching unit includes a ratchet group and a pawl group; the ratchet wheel set comprises a first ratchet wheel and a second ratchet wheel; the pawl group comprises a button, a return spring and gear teeth; the first ratchet wheel is fixed on the sleeve outside the heat exchange unit, and a second ratchet wheel is meshed with the first ratchet wheel and fixed on the sleeve inside the heat exchange unit; the mode switching unit is positioned between the air supply unit and the heat exchange unit; when the mode is switched, the external sleeve of the heat exchange unit is rotated;

3. A portable air conditioner according to claim 1 or 2, characterized in that: the material of the plate-fin radiator is preferably aluminum.

4. A portable air conditioner according to claim 1 or 2, characterized in that: the heat insulation layer is made of epoxy resin and other materials with low heat conductivity coefficient.

5. A portable air conditioner according to claim 1 or 2, characterized in that: the mode switching unit can switch the cooling and heating functions by a mechanical method.