KR102121170B1 - air conditioner capable of defrosting simultaneously during cooling operation - Google Patents

Abstract

Provided is a constant temperature air conditioner capable of defrosting together with cooling without needing to perform separate defrosting using hot gas. According to one embodiment of the present invention, the constant temperature air conditioner comprises: a case forming a first accommodation space and a second accommodation space; a compressor disposed in the first accommodation space and disposed in the front of the case into which air flows; a condenser disposed in the first accommodation space, connected to the compressor through a supply flow path, and disposed over the compressor; a heat dissipation fan disposed on an upper surface of the case to face the condenser and dissipate heat of the condenser; an expansion valve connected to the condenser through the supply flow path; a front evaporator disposed in the first accommodation space and connected to the expansion valve through a front supply flow path; a rear evaporator disposed in the first accommodation space, disposed in the rear of the front evaporator, and connected to the expansion valve through a rear supply flow path; a flow path switching unit connecting the supply flow path to the front supply flow path or to the rear supply flow path; and a control unit controlling the flow path switching unit.

Description

Air conditioner capable of defrosting simultaneously during cooling operation

The present invention relates to a constant temperature air conditioner, which is easy to secure space and supplies a separate hot gas during cooling operation to perform defrosting without performing defrosting operation.

The constant temperature air conditioner is an air conditioner that maintains the temperature of a specific place constant, and it is a device that maintains the temperature constant. It is mainly used in a laboratory environment where constant temperature is required. ).

In general, a constant temperature air conditioner is operated to maintain the temperature of Mokpo at the actual temperature whenever the user sets a specific temperature in the laboratory environment. Typically, a specific temperature within the range of 0℃ ~ 50℃ is set as the target temperature. , The error should be controlled within ±1℃ at the target temperature.

However, when the general air conditioner is operated in cooling, a frost phenomenon occurs on the evaporator 60, so precise temperature control is not performed or energy efficiency is reduced, so a separate defrosting operation is performed. To remove the frost.

In this case, the defrosting operation is an operation in which a refrigerant in a high temperature and high pressure state is used as a hot gas in a condenser to flow to the evaporator to remove frost condensed in the evaporator. During this defrosting operation, cooling operation is performed. It stops and the amount of change in temperature increases and the energy efficiency decreases.

In particular, in a laboratory environment in which a constant temperature air conditioner is used, constant temperature is very important. When the temperature change amount due to such a defrosting operation increases, samples and parts used in the laboratory environment may change, resulting in damage due to defrosting operation. have.

Therefore, it is necessary to develop a constant temperature air conditioner that can easily defrost space while using a minimal space in a narrow laboratory environment, and maintain defrosting while maintaining cooling operation.

The problem to be solved by the present invention is to provide a constant temperature air conditioner that is capable of securing space and capable of simultaneously defrosting during cooling operation capable of defrosting without supplying a separate hot gas during cooling operation to perform defrosting.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

A constant temperature air conditioner according to an embodiment of the present invention for solving the above problems is a case forming a first receiving space and a second receiving space; A compressor disposed in the first accommodation space and disposed in front of the case through which air flows; A condenser disposed in the first accommodation space, connected to a supply passage to the compressor, and disposed at an upper portion of the compressor; A heat dissipation fan disposed on an upper surface of the case and facing the condenser to radiate the condenser; An expansion valve connected to the condenser through the supply flow path; A front evaporator disposed in the first accommodation space and connected to the expansion valve through a front supply flow path; A rear evaporator disposed in the first accommodation space and disposed behind the front evaporator and connected to the expansion valve through a rear supply flow path; A flow path switching unit connecting the supply flow path to the front supply flow path or the rear supply flow path; And a control unit controlling the flow path switching unit. It includes.

In addition, the flow path switching unit may include a three-way valve.

In addition, the front evaporator may be arranged adjacent to the rear evaporator in parallel.

In addition, the front evaporator includes a front upper evaporation flow path provided at an upper portion of the front evaporator and a front lower evaporation flow path provided at a lower portion of the front evaporator, and the rear evaporator rear evaporation provided at an upper portion of the rear evaporator. It may include a flow path and a rear lower evaporation flow path provided in the lower portion of the rear evaporator.

In addition, the front lower evaporation flow path may be connected to the front supply flow path, and the rear lower evaporation flow path may be connected to the rear supply flow path.

In addition, a first crossover passage connecting the front lower evaporation passage to the rear upper evaporation passage; And a second crossing passage connecting the rear lower evaporation passage to the front upper evaporation passage. It may further include.

In addition, when an idea is detected in the lower portion of the front evaporator, the control unit may control the flow path switching unit to close the front supply flow path and open the rear supply flow path.

In addition, the refrigerant may be flowed into the rear supply flow passage, and may flow from the rear lower evaporation flow passage through the second cross flow passage to the front upper evaporation flow passage.

In addition, the supply flow path, a first supply flow path connecting the compressor to the condenser; And a second supply flow path connecting the expansion valve to the flow path switching unit. It may include.

In addition, a hot gas flow path branched from the first supply flow path and connected to the second feed flow path may be further included.

Details of other embodiments are included in the detailed description and drawings.

A constant temperature air conditioner according to an embodiment of the present invention is configured such that the refrigeration cycle is compact in the first accommodation space S1 and the second accommodation space S2 of the case 10, and is installed in a narrow laboratory environment. It is easy and can maximize space utilization.

In addition, the constant temperature air conditioner according to an embodiment of the present invention, when an immersion occurs in the lower portion 610a of the front evaporator 610, the refrigerant flows along the second flow path to continuously perform the cooling operation and the first flow Since defrosting is performed without flowing a refrigerant in the path, defrosting is possible without supplying a separate hot gas during cooling operation, and defrosting is possible, and constant temperature can be maintained.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a front perspective view of a constant temperature air conditioner according to an embodiment of the present invention.
2 is a rear perspective view of a constant temperature air conditioner according to an embodiment of the present invention.
3 is a side view showing the inside of a constant temperature air conditioner according to an embodiment of the present invention.
4 is a top internal perspective view of a constant temperature air conditioner according to an embodiment of the present invention.
5 is an internal side view of a constant temperature air conditioner according to an embodiment of the present invention.
6 is a bottom internal perspective view of a constant temperature air conditioner according to an embodiment of the present invention.
7 is a perspective view of the front evaporator 610 and the rear evaporator 620 according to an embodiment of the present invention.
8 is a side view of the front evaporator 610 and the rear evaporator 620 according to an embodiment of the present invention.
9 is a schematic diagram of a constant temperature air conditioner according to an embodiment of the present invention.
10 (a) is a graph showing the temperature change during hot gas defrosting operation of a general air conditioner, and FIG. 10 (b) is a graph showing the temperature change during defrosting operation of a constant temperature air conditioner according to an embodiment of the present invention.
11 is a schematic diagram of a flow path switching unit 70 according to another embodiment of the present invention.

In describing the present invention, when it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. Even if the terms are the same, it is said in advance that the reference numerals do not match if the parts displayed are different.

In addition, terms to be described later are terms that are set in consideration of functions in the present invention, which may vary according to intentions or conventions of operators such as experimenters and measurers, and thus the definitions should be made based on contents throughout the present specification.

In the present specification, terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from other components. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term and/or includes a combination of a plurality of related described items or any one of a plurality of related described items.

The terms used herein are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains. Terms such as those defined in a commonly used dictionary should be interpreted as having meanings consistent with meanings in the context of related technologies, and should not be interpreted as ideal or excessively formal meanings unless explicitly defined in the present application. Does not.

Also, when a part is said to "include" a certain component, this means that other components may be further included instead of excluding other components, unless specifically stated to the contrary.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals in each drawing denote the same members.

Hereinafter, a constant temperature air conditioner according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

1 is a front perspective view of a constant temperature air conditioner according to an embodiment of the present invention, FIG. 2 is a rear perspective view of a constant temperature air conditioner according to an embodiment of the present invention, and FIG. 3 is a constant temperature air conditioner according to an embodiment of the present invention Inside view is a side view.

1 to 3, a constant temperature air conditioner according to an embodiment of the present invention is a case 10 forming a first accommodation space S1 and a second accommodation space S2, and the first accommodation space S1 The compressor 30 is disposed in front of the case 10 in which the air is introduced, and is disposed in the first receiving space S1 and connected to the compressor 30 with a supply passage L, and the upper part of the compressor 30 The condenser 40 is disposed on the upper surface of the case 10 and is disposed opposite to the condenser 40 and dissipates the condenser 40 as a heat dissipation fan 110 and a condenser 40 as a supply flow path L Expansion valve 50 connected, disposed in the first receiving space (S1) and connected to the expansion valve (50) as a front supply flow path (LF), front evaporator (610), disposed in the first receiving space (S1) and forward It is disposed at the rear of the evaporator 610, the rear evaporator 620 connected to the expansion valve 50 to the rear supply flow path (LR), the supply flow path (L) to the front supply flow path (LF) or the rear supply flow path (LR) It includes a flow path switching unit 70 to be connected to, and a control unit 20 for controlling the flow path switching unit 70.

The case 10 forms an exterior. The case 10 may include a front case 101, a rear case 105, a top case 10, a bottom case 10 and a side case 103. A slit 107 may be formed in the front case 101 or the side case 103. Air flows through the slit 107. In this case, the external air or internal air of the case 10 may flow through the slit 107.

Air flows from the front case 101 to the rear case 105. Here, the air may be introduced (in) in the direction of the arrow shown in FIGS. 1 to 3 and then discharged (out). Hereinafter, an inflow direction (in) of air and a discharge direction (out) of air are defined based on the arrow direction shown in FIGS. 1 to 3. In addition, the air inflow direction is defined as front and the air discharge direction is defined as rear.

The case 10 forms a first accommodation space S1 and a second accommodation space S2 therein. The first accommodation space S1 communicates with the second accommodation space S2. In this case, the case 10 may be provided with an inner frame 140 that separates the first accommodation space S1 and the second accommodation space S2 therein.

The first accommodation space S1 is located in front of the case 10. Air is introduced into the front of the case 10. In this case, air may be introduced through the front case 101 and the side case 103.

The compressor 30, the condenser 40, the condenser, the expansion valve 50, and the evaporator 60 constitute a refrigeration cycle.

The compressor 30 compresses the refrigerant in a high temperature and high pressure state. The condenser 40 is connected to the compressor 30 and the supply flow path L. The condenser 40 heats the refrigerant compressed in the compressor 30 to the outside and cools it to a low temperature and high pressure state. The expansion valve 50 is connected to the evaporator 60 and the supply flow path L. The refrigerant cooled in the expansion valve (50) evaporator (60) expands to a low temperature and low pressure condition. The evaporator 60 is connected to the expansion valve 50.

One end of the evaporator 60 is connected to the expansion valve 50 and the supply flow path (L). The evaporator 60 vaporizes heat exchanged by the refrigerant expanded in the expansion valve 50. In this case, the outside air contacting the evaporator 60 is cooled.

The other end of the evaporator 60 is connected to the compressor 30 and the recovery passage (R). The refrigerant heat-exchanged in the evaporator 60 flows back to the compressor 30 through the recovery passage R, thereby constituting one refrigeration cycle.

Here, the compressor 30 is disposed in the first receiving space (S1). The compressor 30 is disposed in front of the case 10 through which air is introduced.

The condenser 40 may be disposed inside the case 10. The condenser 40 is disposed in the first receiving space S1. The condenser 40 may be disposed above the compressor 30 for effective utilization of the first receiving space S1. In this case, since the condenser 40 does not constitute a separate outdoor unit and is integrally provided with the case 10, installation of a constant temperature air conditioner is facilitated.

The condenser 40 is connected to the compressor 30 and the supply flow path L. The condenser 40 needs to dissipate heat by exchanging heat with a high temperature and high pressure refrigerant to the outside, so that the flow of air should be arranged smoothly. Here, the condenser 40 according to an embodiment of the present invention may be disposed in front of the case 10 through which air is introduced. At this time, air may flow through the slit 107 into the first receiving space S1, and external air may contact the condenser 40.

The heat dissipation fan 110 is disposed on the upper surface of the case 10. In this case, the heat dissipation fan 110 is disposed to face the condenser 40. The heat dissipation fan 110 is connected to an external pipe, and radiated air may be discharged to the outside. In addition, when the heat dissipation fan 110 is exposed as it is without being connected to a separate external pipe, the case 10 may be disposed in an external space separated from the laboratory environment.

The heat dissipation fan 110 dissipates the condenser 40. The heat dissipation fan 110 flows air to the condenser 40 so that the condenser 40 dissipates. In this case, the condenser 40 can be air-cooled.

The expansion valve 50 is connected to the condenser 40 by a supply flow path L. The expansion valve 50 expands the refrigerant to a low temperature and low pressure state as described above. The refrigerant expanded in the expansion valve 50 flows to the evaporator 60. A gas-liquid separator 80 may be provided between the expansion valve 50 and the condenser 40 to flow only the refrigerant vaporized in the condenser 40 into the supply flow path L.

Here, the evaporator 60 according to an embodiment of the present invention includes a front evaporator 610 and a rear evaporator 620. The front evaporator 610 and the rear evaporator 620 cool external air in contact with the surface.

The forward evaporator 610 is disposed in the first accommodation space S1. The forward evaporator 610 is disposed in front of the air in the direction of inflow. The forward evaporator 610 may be provided with a forward supply passage LF, which will be described later. In this case, the expansion valve 50 may be connected to the front supply flow path LF of the front evaporator 610.

The evaporation channels 611 and 613 are provided in the front evaporator 610. The evaporation passages 611 and 613 may be implemented as metal tubes through which refrigerant flows. The evaporation flow paths 611 and 613 are provided so that the refrigerant flows from the lower portion 610a to the upper portion 610b of the front evaporator 610. In this case, one end of the evaporation flow paths 611 and 613 may be connected to the front supply flow path LF, and the other end of the evaporation flow paths 611 and 613 may be connected to the front recovery flow path RF.

The rear evaporator 620 is disposed in the first accommodation space S1. The rear evaporator 620 may be disposed behind the front evaporator 610. The rear evaporator 620 may be provided with a rear supply flow path LR, which will be described later. In this case, the expansion valve 50 may be connected to the rear supply flow path LR of the rear evaporator 620.

The rear evaporator 620 is provided with evaporation flow paths 621 and 623 like the front evaporator 610. The evaporation flow paths 621 and 623 are provided so that the refrigerant flows from the lower portion 620a of the rear evaporator 620 to the upper portion 620b. In this case, one end of the evaporation flow paths 621 and 623 may be connected to the rear supply flow path LR, and the other end of the evaporation flow paths 621 and 623 may be connected to the rear recovery flow path RR.

The front evaporator 610 may be arranged in parallel to the rear evaporator 620. The front evaporator 610 may be disposed adjacent to the rear evaporator 620. The front evaporator 610 may be disposed to contact the rear evaporator 620. The front evaporator 610 and the rear evaporator 620 are disposed adjacent to each other in parallel, so that the first accommodation space S1 of the case 10 can be effectively used.

The flow path switching unit 70 is provided between the expansion valve 50 and the evaporator 60. In this case, the flow path switching unit 70 may be provided between the expansion valve 50 and the front evaporator 610 or the rear evaporator 620.

One end of the flow path switching unit 70 is connected to the supply flow path (L). The other end of the flow path switching unit 70 is connected to the front supply flow path LF and the rear supply flow path LR.

The flow path switching unit 70 selectively connects the supply flow path L to the front feed flow path LF or the rear feed flow path LR. That is, the flow path switching unit 70 connects the supply flow path L to the front supply flow path LF, or connects the supply flow path L to the rear supply flow path LR to allow the refrigerant to flow. In this case, the refrigerant does not flow in the front supply passage LF or the rear supply passage LR that is not connected to the supply passage L.

The flow path switching unit 70 may be implemented as a 3-way valve according to an embodiment. In this case, the supply flow path (L) side is always open, either one of the front supply flow path (LF) side or the rear feed flow path (LR) side can be closed (off) and the other can be opened (on).

The recovery passage R is provided on the top of the evaporator 60. In the recovery passage (R), the refrigerant exchanged in the evaporator 60 flows. The recovery passage R is connected to the compressor 30. Accordingly, the refrigerant exchanged in the evaporator 60 flows to the compressor 30.

The blowing fan 150 is disposed in the second receiving space S2. The blowing fan 150 flows air cooled by the front evaporator 610 or the rear evaporator 620. Here, the blower fan 150 is disposed in the second receiving space S2, so that the cooling efficiency is improved.

That is, the heated air flows in contact with the condenser 40 in the first receiving space S1, and the blowing fan 150 is disposed in the second receiving space S2 spaced apart from the first receiving space S1. The air cooled by the front evaporator 610 and the rear evaporator 620 is blown, and the air heated by the condenser 40 is blown to a minimum. Accordingly, the temperature of the air discharged to the discharge port 120 is blown with air reaching a target temperature set by the user, thereby improving cooling efficiency.

The discharge port 120 is disposed behind the case 10. In this case, the discharge port 120 may be provided to be exposed on the rear case 105. The discharge port 120 discharges air cooled by the blowing fan 150 to the outside. At this time, the cooled air is discharged to the laboratory environment along a pipe connected to the discharge port 120.

The control unit 20 controls the freezing cycle. The control unit 20 may control the operation of the refrigeration cycle by sensing the temperature, frost, current, and voltage sensed by the sensor unit (not shown).

The operation unit 130 is provided at the rear of the case 10. The operation unit 130 may be provided on the rear case 105. The user may control the target temperature, operating time, and on/off of the constant temperature air conditioner through the operation unit 130.

A constant temperature air conditioner according to an embodiment of the present invention is configured such that the refrigeration cycle is compact in the first accommodation space S1 and the second accommodation space S2 of the case 10, and is installed in a narrow laboratory environment. It is easy and can maximize space utilization.

Hereinafter, the structure and operation of the constant temperature air conditioner according to an embodiment of the present invention will be described with reference to FIGS. 4 to 10.

Figure 4 is a top internal perspective view of a constant temperature air conditioner according to an embodiment of the present invention, Figure 5 is an internal side view of a constant temperature air conditioner according to an embodiment of the present invention, Figure 6 is a constant temperature air conditioner according to an embodiment of the present invention 7 is a perspective view of the front evaporator 610 and the rear evaporator 620 according to an embodiment of the present invention, and FIG. 8 is the front evaporator 610 and the rear according to an embodiment of the present invention. Side view of the evaporator 620, Figure 9 is a schematic diagram of a constant temperature air conditioner according to an embodiment of the present invention, Figure 10 (a) is a graph showing the temperature change during the hot gas defrosting operation of a general air conditioner, Figure 10 (b) is a graph showing the temperature change during defrosting operation of a constant temperature air conditioner according to an embodiment of the present invention.

4 to 10, the constant temperature air conditioner according to an embodiment of the present invention includes a front evaporator 610 and a rear evaporator 620.

Here, the front evaporator 610 is provided with a front upper evaporation flow path 613 provided in the upper portion 610b of the front evaporator 610 and a front lower evaporation flow path 611 provided in the lower portion 610a of the front evaporator 610. Including, the rear evaporator 620 is provided at the rear upper evaporation flow path 623 provided at the upper portion 620b of the rear evaporator 620 and the rear lower evaporation flow path 621 provided at the lower portion 620a of the rear evaporator 620. It includes.

The front evaporator 610 may be divided into an upper portion 610b and a lower portion 610a based on the first crossing passage 615 or the second crossing passage 625, which will be described later.

At this time, the front upper evaporation flow path 613 is provided on the upper portion 610b of the front evaporator 610. The front lower evaporation flow path 611 is provided in the lower portion 610a of the front evaporator 610. In this case, the front lower evaporation flow path 611 is connected to the front supply flow path LF, and the front upper evaporation flow path 613 is connected to the front recovery flow path RF.

The rear evaporator 620 may be divided into an upper 620b and a lower 620a based on the first crossing passage 615 or the second crossing passage 625, which will be described later, like the front evaporator 610.

At this time, the rear upper evaporation flow path 623 is provided on the upper portion 620b of the rear evaporator 620. The rear lower evaporation flow path 621 is provided at the lower portion 620a of the rear evaporator 620. In this case, the rear lower evaporation flow path 621 is connected to the rear supply flow path LR, and the rear upper evaporation flow path 623 is connected to the rear recovery flow path RR.

The first crossing passage 615 connects the front lower evaporation passage 611 to the rear upper evaporation passage 623. In this case, the refrigerant flowing in the front lower evaporation flow path 611 flows to the rear upper evaporation flow path 623. That is, the first crossing passage 615 allows the refrigerant to flow to the lower portion 610a of the front evaporator 610 and then to the upper portion 620b of the rear evaporator 620.

Refrigerant flows through the front lower evaporation flow path 611 of the front evaporator 610 and flows to the rear upper evaporation flow path 623 of the rear evaporator 620 by the first crossing flow path 615 to the evaporator 60 during cooling operation. Since the generated evaporation phenomenon is partially transmitted to the rear evaporator 620 rather than being generated to the front evaporator 610, the defrosting efficiency described below is improved.

The second crossing passage 625 connects the rear lower evaporation passage 621 to the upper upper evaporation passage 613. In this case, the refrigerant flowing in the rear lower evaporation channel 621 flows into the upper upper evaporation channel 613. That is, the second crossing passage 625 allows the refrigerant to flow to the lower portion 620a of the rear evaporator 620 and then to the upper portion 610b of the front evaporator 610.

Similar to the first crossing passage 615, the second crossing passage 625 partially transfers the phenomenon of the phenomenon generated in the evaporator 60 during the cooling operation to the front evaporator 610 without generating it to the rear evaporator 620 as a whole. Therefore, defrosting efficiency is improved as described below.

Here, as described above in the prior art, in the case of a constant temperature air conditioner, the error should be controlled within ±1°C from the target temperature, and when an ordinary air conditioner is operated in cooling, frost occurs on an evaporator. As this occurs, precise temperature control is not possible, so a separate defrosting operation is performed to remove the frost.

In this case, the defrosting operation is an operation in which a refrigerant in a high temperature and high pressure state is used as a hot gas in a condenser to flow to the evaporator to remove frost condensed in the evaporator. During such defrosting operation, cooling operation is stopped. The amount of change in temperature increases, and energy efficiency decreases.

Here, as shown in Fig. 10 (a), in the case of defrosting a separate hot gas in an evaporator in a conventional air conditioner, the amount of temperature change becomes large. That is, in the case of a constant temperature air conditioner, the error should be controlled within ±1°C from the target temperature. When defrosting with hot gas, the cooling operation is stopped and the hot gas heats the evaporator 60, so + at the defrosting operation point Dh A temperature change of 2°C or higher may occur. In this case, for example, a temperature change of +2 to 3°C occurs as shown in FIG. 10(a). Accordingly, a change may occur in samples and parts used in a laboratory environment in which a constant temperature air conditioner is used, and damage due to defrosting operation may occur.

In order to solve this, the constant temperature air conditioner according to an embodiment of the present invention does not perform a separate defrosting operation by controlling a flow path of a refrigerant when an idea is detected in the front evaporator 610 or the rear evaporator 620, Defrost function is performed while performing cooling operation continuously.

First, a case in which the refrigerant flows into the supply flow path L and flows through the flow path switching unit 70 to the front supply flow path LF will be described.

When the flow path switching section 70 is implemented as a three-way valve, the flow path switching section 70 flows the refrigerant flowing into the supply flow path (L) to either the front supply flow path (LF) or the rear supply flow path (LR) , So that it does not flow to the other.

Here, when the refrigerant flows into the supply flow path (L) and flows through the flow path switching unit (70) to the front supply flow path (LF), the refrigerant is supplied to the front lower evaporation flow path (611) of the front evaporator (610) and rearward. Refrigerant is not supplied to the supply passage LR. In this case, the refrigerant flows from the front lower evaporation channel 611 and then through the first crossing channel 615 to the rear upper evaporation channel 623. The refrigerant flowing into the rear upper evaporation flow path 623 flows into the rear recovery flow path RR. That is, the refrigerant flows to the lower portion 610a of the front evaporator 610 and then to the upper portion 620b of the rear evaporator 620 to be recovered (hereinafter, referred to as the'first flow path').

At this time, an implantation phenomenon may occur in the lower portion 610a of the front evaporator 610 and the upper portion 620b of the rear evaporator 620. That is, when the refrigerant flows and the cooling operation is performed, the implantation occurs on the surface of the evaporator 60 where the refrigerant expands, and the implantation is mainly formed in the lower portion 610a of the front evaporator 610 where the refrigerant starts to expand. Can be. In this case, an implantation may occur in the lower portion 610a of the front lower evaporation flow path 611 and/or the front evaporator 610.

The control unit 20 may detect that an accident has occurred in the lower portion 610a of the front evaporator 610. The control unit 20 may detect that an implantation has occurred in the front lower evaporation flow path 611. In this case, an implantation sensor (not shown) for detecting an implantation may be provided at a lower portion 610a of the front evaporator 610.

Implantation may also occur in the upper portion 620b of the rear evaporator 620, which is a path through which the refrigerant flows. In this case, an implantation may occur in the rear upper evaporation flow path 623. In this case, an implantation sensor (not shown) for detecting an implantation may be provided at an upper portion 620b of the rear evaporator 620.

The control unit 20 controls the flow path switching unit 70 to close the front supply flow path LF and open the rear supply flow path LR when an idea is detected in the lower portion 610a of the front evaporator 610.

That is, when the refrigerant flows into the first flow path, and when an idea occurs in the lower portion 610a of the front evaporator 610, the control unit 20 controls the flow path switching unit 70 to close the front supply flow path LF. do. In this case, the control unit 20 controls the flow path switching unit 70 to cut off the supply flow path L and the front supply flow path LF. Accordingly, the refrigerant does not flow through the first flow path.

At this time, the flow path switching unit 70 opens the rear supply flow path (LR). In this case, the flow path switching unit 70 connects the supply flow path L to the rear supply flow path LR. The refrigerant flows into the supply flow path (L) and flows through the flow path switching section (70) to the rear feed flow path (LR). In this case, the refrigerant flows from the rear lower evaporation channel 621 and then through the second crossing channel 625 to the upper upper evaporation channel 613. The refrigerant flowing into the front upper evaporation flow path (613) flows into the front recovery flow path (RF). That is, the refrigerant flows to the lower portion 620a of the rear evaporator 620 and then flows to the upper portion 610b of the front evaporator 610 to be recovered (hereinafter referred to as the'second flow path').

Cooling operation is performed while the refrigerant flows along the second flow path. In this case, since the refrigerant does not flow in the first flow path, defrosting is performed by external air at room temperature.

At this time, as described above, since an idea is generated in the lower portion 610a of the front evaporator 610 and/or the upper portion 620b of the rear evaporator 620, when an idea occurs in one front evaporator 610 In contrast, the implantation occurs separately in each evaporator.

If, in the upper 610b and lower 610a of the front evaporator 610, the whole of the front evaporator 610 is raised to a temperature capable of defrosting, defrosting is possible, so the defrosting time is long.

The constant temperature air conditioner according to an embodiment of the present invention is generated by separating the idea into the lower portion 610a of the front evaporator 610 and the upper portion 620b of the rear evaporator 620, so that the refrigerant is rearward along the second flow path. After flowing to the lower portion 620a of the evaporator 620 and then flowing to the upper portion 610a of the front evaporator 610, while the cooling operation is in progress, the lower portion 610a and the rear of the front evaporator 610 that does not flow refrigerant The implantation of the upper portion 620b of the evaporator 620 is removed by room temperature.

Accordingly, the time required to rise to a defrostable temperature is shorter than that of defrosting the entire front evaporator 610 or the rear evaporator 620, so that the defrost can be quickly performed, and the cooling operation can be continuously performed. do.

In addition, when the front evaporator 610 is disposed adjacent to and parallel to the rear evaporator 620, the idea is generated by separating the bottom 610a of the front evaporator 610 and the top 620b of the rear evaporator 620. Therefore, the contact efficiency between the external air and the evaporation channel where the formation occurs is improved, and the defrosting time is shortened.

Likewise, when an idea is detected in the lower portion 620a of the rear evaporator 620, the control unit 20 controls the flow path switching unit 70 to close the rear supply flow path LR and open the front feed flow path LF. do.

In this case, as in the above-described embodiment, the refrigerant does not flow through the second flow path, and the refrigerant flows through the first flow path. While the refrigerant flows through the first flow path, the idea generated in the lower portion 620a of the rear evaporator 620 and/or the upper portion 610b of the front evaporator 610 is defrosted.

Here, as shown in (b) of FIG. 10, the amount of temperature change is reduced because defrost is performed during cooling operation without flowing a separate hot gas to the evaporator 60. That is, in the case of a constant temperature air conditioner, the error should be controlled within ±1°C from the target temperature. Since the defrosting is performed without using a separate hot gas during cooling operation, the flow path switching unit flows from the first flow path to the second flow path. At the point of switching P1 or at the point P2 of switching the flow path from the second flow path to the first flow path, a temperature change of +0.5°C occurs as shown in Fig. 10B. Accordingly, constant temperature is maintained in a laboratory environment in which a constant temperature air conditioner is used.

After all, in the case of the constant temperature air conditioner according to an embodiment of the present invention, when an idea occurs in the lower portion 610a of the front evaporator 610, the refrigerant flows along the second flow path to continuously perform the cooling operation, and the first flow Since defrosting is performed without flowing a refrigerant in the path, defrosting is possible without supplying a separate hot gas during cooling operation, and defrosting is possible, and constant temperature can be maintained.

On the other hand, referring to Figure 9, the constant temperature air conditioner according to an embodiment of the present invention, the first supply flow path (L1) connecting the compressor (30) to the condenser (40), and the expansion valve (50) flow path switching unit ( 70) includes a second supply passage (L2) connected to.

The supply channel L may be implemented separately. The first supply flow path L1 connects the compressor 30 to the condenser 40. The second supply flow path L2 connects the expansion valve 50 to the flow path switching unit 70. The condenser 40 and the expansion valve 50 may be connected to a third supply flow path L3. In this case, a gas-liquid separator 80 may be provided in the third supply channel L3.

Here, the constant temperature air conditioner according to an embodiment of the present invention further includes a hot gas flow path LH branched from the first supply flow path L1 and connected to the second supply flow path L2.

The hot gas flow path LH branches off from the first supply flow path L1. A hot gas, which is a high-temperature and high-pressure refrigerant compressed by the compressor 30, flows in the hot gas flow passage LH.

A hot gas valve 90 is provided in the hot gas flow passage LH. The hot gas valve 90 opens or closes the hot gas flow path LH.

The discharge temperature sensing sensor So may be provided at one end of the discharge port 120 or the blowing fan 150. The discharge temperature detection sensor So senses the discharge temperature of the air cooled and discharged, and transmits it to the control unit 20.

The control unit 20 opens the hot gas valve 90 when the discharge temperature detected by the discharge temperature detection sensor So is supercooled below the error range of the target temperature. In this case, hot gas in a high temperature and high pressure state flows into the second supply flow path L2. At this time, the refrigerant expanded in the expansion valve 50 and the hot gas may be mixed.

The hot gas flowing into the second supply flow path (L2) flows to the evaporator 60. The hot gas may be flowed to the front evaporator 610 or the rear evaporator 620.

Hot gas increases the temperature of the evaporator 60. That is, when the evaporator 60 is supercooled and the discharge temperature is outside the error range of the target temperature, the temperature of the evaporator 60 is increased, so that the air in the evaporator 60 is cooled within the error range of the target temperature.

Accordingly, in this case, since the constant temperature air conditioner according to an embodiment of the present invention continuously performs cooling operation, a separate hot gas is used only to control the target temperature by preventing the supercooling phenomenon of the evaporator 60, so that the constant temperature Will maintain.

Hereinafter, the structure and operation of the flow path switching unit 70 according to another embodiment of the present invention will be described with reference to FIG. 11.

11 is a schematic diagram of a flow path switching unit 70 according to another embodiment of the present invention.

Referring to Figure 11, the flow path switching unit 70 according to another embodiment of the present invention is provided between the supply flow path (L) and the front supply flow path (LF), the first sole to open and close the supply flow path (L) A valve (SV1), a branch flow path (LB) branching from the supply flow path (L), and a second sole valve (SV2) provided between the branch flow path (LB) and the rear supply flow path (LR) to open and close the branch flow path (LB) ).

The supply passage (L) is connected to the front supply passage (LF). The first sole valve SV1 is provided between the supply passage L and the front supply passage LF. The first sole valve SV1 opens/closes the supply flow path L according to the control signal from the control unit 20.

The branch flow path LB is branched from the supply flow path L. The branch flow path LB is connected to the rear supply flow path LR. The second sole valve SV2 is provided between the branch flow path LB and the front supply flow path LF. The second sole valve SV2 opens/closes the branch flow path LB according to the control signal from the control unit 20.

As described above, when the first sole valve SV1 is opened and the second sole valve SV2 is closed, the refrigerant flows along the first flow path. In addition, when the first sole valve SV1 is closed and the second sole valve SV2 is opened, the refrigerant flows along the second flow path.

At this time, the implantation phenomenon may occur in the lower portion 610a of the front evaporator 610 and/or the upper portion 620b of the rear evaporator 620 as described above. In this case, the control unit 20 closes the first sole valve SV1 and opens the second sole valve SV2 to allow the refrigerant to flow through the second flow path.

Accordingly, the cooling operation is performed while the refrigerant flows along the second flow path as described above. In this case, since the refrigerant does not flow in the first flow path, defrosting is performed by external air at room temperature.

Likewise, the implantation phenomenon may occur in the lower portion 620a of the rear evaporator 620 and/or the upper portion 610b of the front evaporator 610 as described above. In this case, the control unit 20 closes the second sole valve SV2 and opens the first sole valve SV1 to allow the refrigerant to flow in the first flow path.

Accordingly, as described above, cooling operation is performed while the refrigerant flows along the first flow path. In this case, since the refrigerant does not flow in the second flow path, defrosting is performed by external air at room temperature.

As described above, those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing its technical spirit or essential features. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

The scope of the present invention is indicated by the scope of the claims, which will be described later, rather than the detailed description, and all the modified or modified forms derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. Should be interpreted.

10: case 20: control unit
30: compressor 40: condenser

Claims (2)

A case forming a first accommodation space and a second accommodation space; A compressor disposed in the first accommodation space and disposed in front of the case through which air flows; A condenser disposed in the first accommodation space and connected to the compressor as a supply flow path and disposed at an upper portion of the compressor; A heat dissipation fan disposed on an upper surface of the case and facing the condenser to radiate the condenser; An expansion valve connected to the condenser through the supply flow path; A front evaporator disposed in the first accommodation space and connected to the expansion valve through a front supply flow path; A rear evaporator disposed in the first accommodation space and disposed behind the front evaporator and connected to the expansion valve through a rear supply flow path; A flow path switching unit connecting the supply flow path to the front supply flow path or the rear supply flow path; And a control unit controlling the flow path switching unit. Including,
The front evaporator includes a front upper evaporation flow path provided at the top of the front evaporator and a front bottom evaporation flow path provided at the bottom of the front evaporator, and the rear evaporator rear evaporation flow path provided at the top of the rear evaporator, It includes a rear lower evaporation flow path provided in the lower portion of the rear evaporator,
The front lower evaporation flow path is connected to the front supply flow path, and the rear lower evaporation flow path is connected to the rear supply flow path,
The first crossing passage connects the front lower evaporation passage to the rear upper evaporation passage, and the second cross passage connects the rear lower evaporation passage to the front upper evaporation passage,
The flow path switching unit is provided between the supply flow path and the front supply flow path, a first sole valve for opening and closing the supply flow path; And a branch channel branching from the supply channel; Including,
The control unit controls the flow path switching unit when an implantation is detected in the lower portion of the front evaporator, closes the front supply flow path, opens the rear supply flow path, and flows the refrigerant in the rear lower evaporation flow, and then crosses the second. Flow through the flow path to the evaporation flow path in the upper part,
A constant temperature air conditioner that removes the image of the lower portion of the front evaporator and the upper portion of the rear evaporator by room temperature during cooling operation.
According to claim 1,
The forward evaporator is a constant temperature air conditioner arranged in parallel adjacent to the rear evaporator.

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