KR20050102065A - Mobile heat pump capable of spot cooling and spot heating - Google Patents

Abstract

The present invention relates to a movable spot air conditioner, comprising: a housing having a movable caster; Placed inside the housing, the first air intake and the cooling (heating) or (heated) air (air) in the factory workshop, production line, outdoor workshop, kitchen cooking room, school lunch, golf practice, car repair shop, etc. A first heat exchange chamber having a first air outlet for discharging only locally around the operator and a first blower for sucking air from the first air inlet and discharging air to the first air outlet; A second blower is provided inside the housing and separated by the first heat exchange chamber and the partition wall, and allows air to circulate between the second air inlet, the second air outlet, the second air inlet, and the second air outlet. A second heat exchange chamber; A first heat exchanger provided in the first heat exchange chamber; A second heat exchanger provided in the second heat exchange chamber; A compressor connected to the first heat exchanger and the second heat exchanger by a pipe to form a refrigerant circulation circuit, compressing the refrigerant, and supplying the refrigerant to the refrigerant circulation circuit; A bidirectional expansion valve provided between the first heat exchanger and the second heat exchanger and converting the condensed high temperature and high pressure liquid refrigerant into a low temperature low pressure liquid refrigerant that is easy to evaporate; And in the refrigerant circulation circuit, when cooling, the refrigerant flows to the compressor-> second heat exchanger-> bidirectional expansion valve-> first heat exchanger-> compressor, and when heating, the compressor-> first heat exchanger. -> Two-way expansion valve-> second heat exchanger-> to the compressor, the refrigerant switching means for causing evaporation in the first heat exchanger when cooling, condensation occurs in the first heat exchanger when heating; According to the present invention, according to the present invention, a single structurally simple device can perform spot cooling or spot heating around an operator or exerciser with high energy efficiency according to a user's selection. In particular, since sufficient latent heat may be supplied to the low pressure refrigerant during heating by adjoining two heat exchange chambers, there is an effect of achieving power saving heating by a heat pump.

Description

Mobile spot air conditioner using heat pump {MOBILE HEAT PUMP CAPABLE OF SPOT COOLING AND SPOT HEATING}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile spot cooling and heating apparatus, and more particularly to spot cooling or spot heating with a compact and high energy efficiency using a heat pump and a serpentine heat exchanger. It relates to a mobile spot air conditioner using a heat pump that can selectively perform).

Steel mills, injection plants, extrusion plants, die cast plants, ceramics plants, glass plants, restaurant cooking rooms, confectionery plants, and bakeries with high heat generation due to the use of furnaces or fires are especially workers during the summer months. The environment is very poor to work due to the high temperature, but it is practically impossible to cool the entire space by air conditioning. This is because there is a limit to cooling the entire space due to continuous heat generation from the heat source, and it causes excessive energy waste. Conventional mobile spot coolers are used for workers working at such high temperature workplaces, and examples thereof are disclosed in Korean Patent Laid-Open Publication No. 1998-0010206. These portable spot coolers are provided with all parts constituting a refrigeration cycle, such as a compressor, a condenser and an evaporator, inside the casing provided with a caster, and are configured to inject and cool the air inside the factory and to discharge only locally around the operator. . Such portable spot coolers are also used in outdoor workshops, such as car repair shops, where it is difficult to cool the space, or in outdoor sports facilities such as golf practice ranges. However, the conventional spot cooler uses a plate-type fin type heat exchanger as a heat exchanger, a condenser and an evaporator. there was.

In addition, it is cold in the winter at outdoor sports facilities such as assembly lines, factories that mainly use machine tools, and indoor workshops without heat sources, rural workshops, construction sites, civil engineering sites, car workshops, or golf training grounds. Due to the extremely poor environment for workers or exercisers to work or exercise, it is practically difficult to heat the entire space by a heater or a boiler. This is because most of these working spaces or exercise spaces are not enclosed or have a limited amount of space occupied by workers or exercisers, and heating the entire space for workers or exercisers causes excessive energy waste. Conventionally, various types of electric heaters have been used for local heating.

However, the electric heater has a disadvantage in that the thermal efficiency is very low, the power consumption is not only high, but also used for local cooling in the summer. Though a portable spot air conditioner combining an electric heater with a conventional spot cooler may be conceived, this is not only structurally complex, but also has a disadvantage in that thermal efficiency during heating and power consumption are high.

The present invention devised to solve the above-mentioned problems of the prior art is a structurally simple, mobile type using a heat pump capable of performing spot cooling or spot heating with high energy efficiency according to a user's choice. To provide a spot air conditioner.

Another object of the present invention is to provide a portable spot air conditioner using a heat pump that can automatically increase the cooling rate of the condenser when the condensation pressure is higher than the set pressure.

Another object of the present invention is a heat that can protect the components of the refrigerant circulation circuit by automatically stopping the compressor automatically when the pressure fluctuation occurs in the refrigerant circulation circuit due to external factors, the condensation pressure or the evaporation pressure is too high or low. A mobile spot air conditioner using a pump is provided.

Mobile spot air conditioner using a heat pump according to the present invention to achieve the above object

A housing having a caster for movement; Placed inside the housing, the first air intake and the cooling (heating) or (heated) air (air) in the factory workshop, production line, outdoor workshop, kitchen cooking room, school lunch, golf practice, car repair shop, etc. A first heat exchange chamber having a first air outlet for discharging only locally around the operator and a first blower for sucking air from the first air inlet and discharging air to the first air outlet; A second blower is provided inside the housing and separated by the first heat exchange chamber and the partition wall, and allows air to circulate between the second air inlet, the second air outlet, the second air inlet, and the second air outlet. A second heat exchange chamber; A first heat exchanger provided in the first heat exchange chamber; A second heat exchanger provided in the second heat exchange chamber; A compressor connected to the first heat exchanger and the second heat exchanger by a pipe to form a refrigerant circulation circuit, compressing the refrigerant, and supplying the refrigerant to the refrigerant circulation circuit; A bidirectional expansion valve provided between the first heat exchanger and the second heat exchanger and converting the condensed high temperature and high pressure liquid refrigerant into a low temperature low pressure liquid refrigerant that is easy to evaporate; And in the refrigerant circulation circuit, when cooling, the refrigerant flows to the compressor-> second heat exchanger-> bidirectional expansion valve-> first heat exchanger-> compressor, and when heating, the compressor-> first heat exchanger. -> Two-way expansion valve-> second heat exchanger-> to the compressor, the refrigerant switching means for causing evaporation in the first heat exchanger when cooling, condensation occurs in the first heat exchanger when heating; It is characterized by.

The first heat exchanger and the second heat exchanger are preferably serpentine heat exchangers.

In addition, the refrigerant switching means is preferably composed of a four-way valve, a controller for controlling the opening and closing path of the four-way valve in accordance with the user's operation.

In addition, the high pressure tube of the compressor is further provided with a high pressure switch, and the controller receives the signal of the high pressure switch, if the discharge pressure of the compressor is higher than the pressure set in the high pressure switch, the second blower for cooling, and for heating It is preferable to accelerate the first blower.

In addition, the high-pressure tube and the low-pressure tube of the compressor is further provided with a high pressure low pressure switch, the controller receives the signal of the high pressure low pressure switch, if the discharge pressure of the compressor is greater than or less than the pressure set in the high pressure low pressure switch to operate the compressor. It is preferable to stop.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of a mobile spot air conditioner using a heat pump according to the present invention.

1 is a block diagram of a mobile spot air conditioner using a heat pump according to the present invention, Figure 2 is a flow chart of the refrigerant in the cooling mode of the mobile spot air conditioner using a heat pump according to the present invention, Figure 3 is a heat pump according to the present invention 4 is a perspective view of a serpentine heat exchanger used in an embodiment of the present invention, and FIG. 4B is a serpentine heat exchanger used in an embodiment of the present invention. Partially cut and partially exploded perspective views of the device, FIG. 4C shows a front view of a serpentine heat exchanger, respectively, used in one embodiment of the present invention.

The heat pump arranges one of the heat exchangers of the refrigerating cycle indoors and the other of the heat exchangers indoors and then changes the refrigerant circulation direction as needed by using a refrigerant switching means. This is the device that causes the condensation to occur in the heat exchanger in the room during heating. However, the actual heat pump has no problem in cooling, but during the heating in winter, due to the low outside temperature in winter, the refrigerant does not sufficiently absorb the latent heat of evaporation, resulting in poor evaporation, resulting in poor compression, resulting in condensation heat. The amount of generation is also reduced, and effective indoor heating is not achieved. However, if the evaporative latent heat can be supplied to the evaporator during the heating in the refrigeration cycle of the heat pump, energy-efficient heating with high energy efficiency is possible. That is, in the entire heating of the enclosed space, evaporation should occur in the heat exchanger installed outdoors for the heating efficiency of the entire space. However, in the case of spot heating, as shown in FIG. A heat exchanger for condensation (H1) and an evaporation heat exchanger (H2) may be installed together with the diaphragm 29 capable of some degree of heat transfer therebetween. It is possible to supply a certain amount of latent heat of evaporation to (H2) to maximize the generation of condensation heat in the heat exchanger (H1) for condensation during heating. The present invention focuses on this point of the heat pump.

Referring to FIG. 1, a feature of the present invention includes a first heat exchange chamber 13 and a second heat exchange chamber 18, each of which includes a caster 31a and 31b and is movable within a movable housing HS. Heat exchangers H1 and H2 are provided at 13 and 18 to form a refrigerant circulation circuit composed of the compressor CO, the heat exchangers H1 and H2, and the bidirectional expansion valve 3, and then the refrigerant switching means ( In the exemplary embodiment shown in FIG. 1, the compressor (CO)-> second heat exchanger (H2)-> bidirectional expansion valve (3)-> first heat exchanger (H1) during cooling by the 4-way valve (1). The refrigerant flows through the compressor (CO) to evaporate in the first heat exchanger (H1), and during heating, the compressor (CO)-> first heat exchanger (H1)-> bidirectional expansion valve (3)- > 2nd heat exchanger (H2)-> compressor (CO) to cause condensation in the first heat exchanger (H2). It is possible to perform spot cooling or spot heating around an exerciser. At this time, the air heat-exchanged in the first heat exchange chamber 13 is locally discharged around the worker or the exerciser. The first heat exchange chamber 13 and the second heat exchange chamber 18 are separated by a partition 29 having a heat conducting wire, so that sufficient latent heat may be supplied to the low pressure refrigerant during heating to achieve power saving heating by a heat pump. You can do it.

The first heat exchange chamber 13 provided in the housing HS receives the first air intake 12 and the cooled or heated air from a factory workshop, a production line, an outdoor workshop, a kitchen cooking room, or a school. The first air outlet 16 may suck air from the first air outlet 16 and the first air intake 12 to discharge only locally around the worker in a place where space cooling and heating are difficult, such as a lunch place, a golf practice range, and a car repair shop. And a first blower 14 for discharging air to the air. In addition, the first heat exchange chamber 13 is provided with a first heat exchanger (H1), the first air inlet 12 is the air introduced from the outside can pass through the first heat exchanger (H1). In place. In addition, as illustrated in FIG. 1, a first duct 15 may serve as an air passage between the first blower 14 and the first air outlet 16.

The second heat exchange chamber 18 is separated by the first heat exchange chamber 13 and the partition wall 29, and the second air intake port 17, the second air outlet port 21, and the second air intake port ( 17) and a second blower 19 for allowing air to circulate between the second air exhaust port 21, and inside the second heat exchanger in which a change in refrigerant state opposite to that of the first heat exchanger H1 occurs. H2) is provided. When the cold air is discharged from the first air outlet 16, hot air is discharged from the second air outlet 21, and when the hot air is discharged from the first air outlet 16, the second air outlet 21 is discharged. In (), since cold air is discharged, it is preferable that the air discharge direction of the first air outlet 16 and the second air outlet 21 be in the opposite direction. In addition, a second duct 20 for guiding the discharged air may be further provided between the second blower 19 and the second air outlet.

The compressor CO, the first blower 14 and the second blower 19 are controlled by the controller 11.

4A to 4C, another feature of the present invention is to use a serpentine heat exchanger as the first heat exchanger H1 and the second heat exchanger H2. The serpentine heat exchanger is formed in a refrigerant tube 40 formed by bending a corrugated fin 44 made of aluminum into a flat shape and bending a tube having a plurality of flow paths 41 formed therein in a serpentine shape. By inserting and installing the header pipes 42 and 43 at both ends of the tube 40, the volume can be significantly reduced compared to a plate fin type heat exchanger used in a conventional mobile air conditioner, while also providing heat exchange efficiency. Can greatly improve. The serpentine heat exchanger is a heat exchanger well suited for a mobile air conditioner, which requires a high heat exchange efficiency and minimizes the volume in order to make it mobile. In particular, the serpentine heat exchanger applied to the embodiment of the present invention has an opening that allows the air passing through the corrugated fin 44 to pass between the fin 44 surface and the rear surface as shown in FIG. 4B. ) A large number of through holes 45 and 46 opened in a cross direction in the surface direction and the rear surface of the fin 44 is provided, and the heat exchange efficiency is very excellent compared to the volume thereof.

Referring back to FIG. 1, drain pans 23 and 25 may collect condensed water generated when evaporation occurs in each heat exchanger under the first heat exchanger H1 and the second heat exchanger H2. And condensate collected in each of the drain pans 23 and 25 is discharged to the condensate bucket 27 provided in the lower part of the housing by the drain pipes 24 and 26. Condensate collected in the condensate tank 27 is discharged by a separate hose (not shown), or the condensate bucket 27 is removed from the drain pipe 26 and then emptied.

The first heat exchanger (H1) and the second heat exchanger (H2) are a compressor (CO) for compressing a refrigerant at a high temperature and high pressure and supplying it to a refrigerant circulation circuit, and the first heat exchanger (H1) or a second heat exchanger ( H2) is connected to the two-way expansion valve (3) and pipe connected to the low-temperature low-pressure liquid refrigerant easy to evaporate by dropping the temperature and pressure of the high-temperature high-pressure liquid refrigerant condensed in the refrigerant circulation circuit. As shown in Figure 1, it is preferable to further include a filter dryer (2) for filtering foreign matter of the refrigerant adjacent to the two-way expansion valve (3). In addition, the filter drier 2 is preferably a two-way filter drier 2. In addition, the low pressure tube (refrigerant recovery tube) 9b of the compressor may further include a liquid separator 8 that separates the unvaporized refrigerant from the refrigerant recovered by the compressor and then vaporizes it and sends it to the compressor.

In the high pressure pipe (refrigerant discharge pipe) 9a of the compressor CO, when the discharge pressure of the compressor C0 rises above a certain pressure due to a poor condensation in the heat exchanger H1 or H2, a voltage signal is supplied to the controller 11. It is further provided with a high-pressure switch (5) for generating, when the controller 11 receives the signal of the high-pressure switch (5) when the discharge pressure of the compressor (CO) is less than the pressure set in the high-pressure switch (5) Until the second blower 19 (condensation occurs in the second heat exchanger when cooling), the first blower 14 (condensation occurs in the first heat exchanger when heating) It is desirable to accelerate.

The refrigerant discharge pressure or the refrigerant recovery pressure of the compressor CO is preset in the high pressure pipe (refrigerant discharge pipe) 9a and the low pressure pipe (refrigerant recovery pipe) 9b of the compressor CO by the change of external conditions. It is further provided with a high pressure low pressure switch (4) for generating a voltage signal to the controller 11 when rising above a value or below a preset value, the controller 11 inputs the signal of the high pressure low pressure switch (4) When the discharge pressure of the compressor CO is higher than or equal to the pressure set in the high pressure low pressure switch 4, the compressor CO is preferably stopped to protect the components constituting the refrigerant circulation circuit. In FIG. 1, reference numeral 6 denotes a low pressure gauge in which the user can visually check the pressure of the low pressure tube 9b of the compressor, and reference numeral 7 denotes a high pressure gauge in which the user can visually check the pressure of the high pressure tube 9a of the compressor.

The present invention includes a refrigerant switching means for using the refrigerant circulation circuit having the above-described configuration as a heat pump, Figures 1 to 3 as a four-way valve (1) and the user's operation as the refrigerant switching means An embodiment employing a controller path 11 for controlling the opening and closing path of the 4-way valve 1 is illustrated. The use of the four-way valve 1 as the refrigerant switching means allows the high temperature high pressure refrigerant and the high temperature low pressure refrigerant to flow through a solenoid valve so that the high pressure refrigerant can be supercooled and the low pressure refrigerant absorbs the latent heat of evaporation. This is to increase energy efficiency. Of course, there is also an effect of extending the life of the valve by blocking the temperature of the valve rises or falls too much.

2 and 3, a cooling operation mode and a heating operation mode of a mobile spot air conditioner using a heat pump according to the present invention will be described.

As shown in FIG. 2 or FIG. 3, the a port of the four-way valve is connected to the high pressure tube 9a of the compressor C, the b port is the second heat exchanger H2, and the c port is the first heat exchanger. To the machine H1, the d port is connected to the low pressure tube 9b of the compressor via the liquid separator 8, respectively.

Referring to FIG. 2, during cooling, the controller 11 connects a port of the four-way valve to a b port and a c port to a d port. Accordingly, the refrigerant flows through the compressor (CO)-> second heat exchanger (H2)-> bidirectional expansion valve (3)-> first heat exchanger (H1)-> compressor (CO), and the first heat exchanger. Evaporation at H1 and condensation at the second heat exchanger H2 cause the cold air to be discharged to the first air outlet 16 when the first blower 14 is rotated.

Referring to FIG. 3, when heating, the controller 11 connects a port of the four-way valve to c port and b port to d port. Therefore, the refrigerant flows from the compressor (CO)-> first heat exchanger (H1)-> bidirectional expansion valve (3)-> second heat exchanger (H2)-> compressor (CO), and the first heat exchanger (H1). ), Evaporation occurs in the second heat exchanger (H2), and when the first blower 14 rotates, the warm air is discharged to the first air outlet 16.

According to the present invention having the above-described configuration, it is possible to perform spot cooling or spot heating around the worker or the exerciser with high energy efficiency according to the user's selection by one structurally simple device. In particular, since sufficient latent heat may be supplied to the low pressure refrigerant during heating by adjoining two heat exchange chambers, there is an effect of achieving power saving heating by a heat pump. In addition, according to the present invention, the cooling and cooling performance is improved by the automatic change of the condenser cooling rate according to the condensation pressure, by allowing the air conditioner to operate only within a constant condensation pressure or evaporation pressure, it is possible to protect the components of the refrigerant circulation circuit There is this.

1 is a block diagram of a mobile spot air conditioner using a heat pump according to the present invention.

2 is a flow chart of a refrigerant in a cooling mode of a mobile spot air conditioner using a heat pump according to the present invention.

3 is a flow chart of a refrigerant in a heating mode of a mobile spot air conditioner using a heat pump according to the present invention.

4A is a perspective view of a serpentine heat exchanger used in one embodiment of the present invention.

4B is a partial cutaway and partially exploded perspective view of the serpentine heat exchanger used in one embodiment of the present invention.

4C is a front view of the serpentine heat exchanger used in one embodiment of the present invention.

                  Explanation of symbols on the main parts of the drawings

1: 4-way valve 2: filter drier

3: bidirectional expansion valve 4: high pressure low pressure switch

5: high pressure switch 6: low pressure gauge

7: high pressure gauge 8: liquid separator

9a: high pressure tube 9b: low pressure tube

11: controller 12, 17: air intake

16, 21: air outlet 13, 18: heat exchange chamber

14, 19: blower 15, 20: duct

23, 25: drain pan 24, 26: drain pipe

      27: condensate bottle 28: parts compartment

29, 30: partition 31a, 31b: caster

40: tube 41: euro

42, 43: header pipe 44: pin

45, 46: through-hole CO: compressor

      H1, H2: heat exchanger HS: housing

Claims (5)

A housing (HS) having movable casters (31a, 31b); Inside the housing (HS), the first air intake 12 and the air (chilled or heated) the air (factory) workshop, production line, outdoor workshop, kitchen cooking room, school cafeteria, golf practice hall, car repair shop The air is sucked from the first air outlet 16 and the first air inlet 12 which are locally discharged only in the vicinity of a worker in a place where space cooling and heating is difficult, and the air is discharged to the first air outlet 16. A first heat exchange chamber (13) having a first blower (14); The first heat exchange chamber 13 and the partition 29 are separately provided in the housing HS, and the second air inlet 17, the second air outlet 21, and the second air intake 17 A second heat exchange chamber (18) having a second blower (19) for causing air to circulate between the second air outlet (2) and the second air outlet (21); A first heat exchanger (H1) provided in the first heat exchange chamber (13); A second heat exchanger (H2) provided in the second heat exchange chamber (18); A compressor (CO) connected to the first heat exchanger (H1) and the second heat exchanger (H2) to form a refrigerant circulation circuit, compressing the refrigerant, and supplying the refrigerant to the refrigerant circulation circuit; It is provided between the first heat exchanger (H1) and the second heat exchanger (H2), the bidirectional expansion valve for converting into a low temperature low pressure liquid refrigerant easy to evaporate by dropping the temperature and pressure of the condensed high temperature and high pressure liquid refrigerant (3); And It is provided in the refrigerant circulation circuit, and when cooling, the refrigerant to the compressor (CO)-> second heat exchanger (H2)-> bidirectional expansion valve (3)-> first heat exchanger (H1)-> compressor (CO) Flows to the compressor (CO)-> first heat exchanger (H1)-> bidirectional expansion valve (3)-> second heat exchanger (H2)-> compressor (CO). A mobile spot air conditioner using a heat pump, comprising: a refrigerant switching means for causing evaporation in the first heat exchanger (H1) and condensation in the first heat exchanger (H2) during heating. The method of claim 1, The first heat exchanger (H1) and the second heat exchanger (H2) is a mobile spot air conditioner using a heat pump, characterized in that the serpentine (serpentine) heat exchanger. The method according to claim 1 or 2, The refrigerant switching means is a four-way valve (1), a mobile spot air conditioner using a heat pump, characterized in that composed of a controller 11 for controlling the opening and closing path of the four-way valve (1) according to the user's operation . The method of claim 3, wherein The high pressure tube 9a of the compressor CO is further provided with a high pressure switch 5, and the controller 11 receives a signal of the high pressure switch 5 and the discharge pressure of the compressor CO is high pressure switch ( 5) The mobile spot air conditioner using a heat pump, characterized in that for accelerating the second blower (19) when cooling, and the first blower (14) when heating. The method of claim 3, wherein The high pressure tube 9a and the low pressure tube 9b of the compressor CO further include a high pressure low pressure switch 4, and the controller 11 receives a signal from the high pressure low pressure switch 4 to receive the compressor CO. And the discharge pressure of the high pressure low pressure switch (4) is lower than or equal to the pressure set in the high pressure low pressure switch (4).