KR102076688B1 - air conditioner capable of defrosting simultaneously during cooling operation - Google Patents

Abstract

According to an embodiment of the present invention, a 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 through which air flows; a condenser disposed in the first accommodation space to be connected to the compressor through a supply flow path and disposed on an upper portion of the compressor; a heat dissipation fan disposed on an upper surface of the case to face the condenser and dissipate the 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 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, and to a constant temperature air conditioner that is easy to secure space and is capable of simultaneously performing defrosting during a cooling operation without defrosting by supplying a separate hot gas during a cooling operation.

A constant temperature air conditioner is an air conditioner that maintains a constant temperature in a specific place. It is an important device that maintains a constant temperature and is compact in order to make use of a narrow space because it is mainly used in a laboratory environment requiring constant temperature. Should be configured.

In general, the constant temperature air conditioner operates to maintain the actual temperature of Mokpo when the user sets a specific temperature to the target temperature in a laboratory environment. In general, a constant temperature within the range of 0 ° C to 50 ° C is used as the target temperature. The error should be controlled to within ± 1 ° C of the target temperature.

However, in the case of cooling and operating a general air conditioner, an frost phenomenon occurs in the evaporator 60, so that precise temperature control is not performed or energy efficiency is reduced, so that separate defrosting operation is performed. To remove the frost formed.

At this time, the defrosting operation is an operation of removing frost formed on the evaporator by flowing a refrigerant at a high temperature and high pressure in a condenser as a hot gas to the evaporator. The cooling operation is performed while the defrosting operation is performed. It is stopped and the change of temperature becomes large and energy efficiency also decreases.

In particular, in the laboratory environment where the constant temperature air conditioner is used, the temperature is very important. If the temperature change caused by the defrosting operation increases, the sample and the parts used in the laboratory environment may change, which may cause damage due to the defrosting operation. have.

Therefore, it is necessary to develop a constant temperature air conditioner that can be easily defrosted while maintaining a cooling operation as it is, using a minimum amount of space in a narrow laboratory environment.

The problem to be solved by the present invention is to provide a constant temperature air conditioner that is easy to secure space and can be simultaneously defrosted during the cooling operation that can be defrosted without performing a defrost operation by supplying a separate hot gas during the cooling operation.

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

Constant temperature air conditioner according to an embodiment of the present invention for solving the above problems a case forming a first accommodation space and the second accommodation space; A compressor disposed in the first accommodation space and disposed in front of the case into which air is introduced; A condenser disposed in the first accommodating space and connected to the compressor via a supply passage, and disposed above the compressor; A heat dissipation fan disposed on an upper surface of the case and disposed to face the condenser and dissipating the condenser; An expansion valve connected to the supply passage to the condenser; A front evaporator disposed in the first accommodation space and connected to the expansion valve by a front supply passage; A rear evaporator disposed in the first accommodation space and disposed behind the front evaporator, the rear evaporator being connected to a rear supply flow path to the expansion valve; A flow path switching unit for 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 forward evaporator may be disposed adjacent to the rear evaporator in parallel.

The forward evaporator may further include a front upper evaporation passage provided at an upper portion of the front evaporator and a front lower evaporation passage provided at a lower portion of the front evaporator, and the rear evaporator may include a rear upper evaporator 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 passage may be connected to the front supply passage, and the rear lower evaporation passage may be connected to the rear supply passage.

In addition, a first cross-flow passage for 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.

The controller may control the flow path switching unit to close the front supply flow path and open the rear supply flow path when an implantation is detected at the lower portion of the front evaporator.

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

The supply passage may further include a first supply passage connecting the compressor to the condenser; And a second supply passage connecting the expansion valve to the flow path switching unit. It may include.

The apparatus may further include a hot gas passage branched from the first supply passage and connected to the second supply passage.

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

The constant temperature air conditioner according to the exemplary embodiment of the present invention is configured to have a refrigeration cycle compactly formed in the first accommodation space S1 and the second accommodation space S2 of the case 10, and thus, may be installed in a narrow laboratory environment. It is easy and maximizes space utilization.

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

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.
Figure 2 is a rear perspective view of a constant temperature air conditioner according to an embodiment of the present invention.
Figure 3 is a side view showing the interior of the constant temperature air conditioner according to an embodiment of the present invention.
Figure 4 is a perspective view of the upper side of the constant temperature air conditioner according to an embodiment of the present invention.
Figure 5 is an internal side view of the constant temperature air conditioner according to an embodiment of the present invention.
Figure 6 is a lower 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.
Figure 10 (a) is a graph showing the temperature change during the hot gas defrosting operation of the general air conditioner, Figure 10 (b) is a graph showing the temperature change during the defrost operation of the 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, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Even if the terms are the same, if the parts to be displayed are different from each other, it is to be noted that the reference numerals do not match.

The terms to be described below are terms set in consideration of functions in the present invention, which may vary depending on the intention or custom of an operator such as an experimenter and a measurer, and the definitions thereof should be made based on the contents throughout the present specification.

In this 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 another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The term and / or includes a combination of a plurality of related items or any item of a plurality of related items.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. A singular expression includes a plural expression 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 one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

In addition, when a part is said to "include" a certain component, it means that it may further include other components, without excluding the other components unless otherwise stated.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

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 view of a constant temperature air conditioner according to an embodiment of the present invention. The side view is shown inside.

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

The case 10 forms an appearance. The case 10 may include a front case 101, a rear case 105, an upper case 10, a lower case 10, and a side case 103. Slits 107 may be formed in the front case 101 or the side case 103. Air flows through the slit 107. In this case, 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 Figures 1 to 3 and then discharged (out). Hereinafter, the inflow direction (in) of the air and the discharge direction (out) of the air are defined based on the arrow directions shown in FIGS. 1 to 3. In addition, the inflow direction of the air is defined as the front and the discharge direction of the air is defined as the 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 internal frame 140 that distinguishes 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 flows into the front of the case 10. In this case, air may be introduced through the front case 101 and the side case 103.

A compressor 30, a condenser 40, an expansion valve 50 and an evaporator constitute a refrigeration cycle.

The compressor 30 compresses the refrigerant to a high temperature and high pressure. The condenser 40 is connected to the compressor 30 and the supply flow path (L). The condenser 40 heats the refrigerant compressed by the compressor 30 to the outside and cools it to a low temperature and high pressure. 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) is expanded to a low temperature low pressure state. 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 the refrigerant expanded by the expansion valve 50 by heat exchange. In this case, the outside air in contact with the evaporator 60 is cooled.

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

Here, the compressor 30 is disposed in the first accommodation 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 accommodation space S1. The condenser 40 may be disposed above the compressor 30 for effective utilization of the first accommodation space S1. In this case, since the condenser 40 is provided integrally in the case 10 without forming a separate outdoor unit, installation of the constant temperature air conditioner is facilitated.

The condenser 40 is connected to the compressor 30 and the supply flow path (L). Since the condenser 40 has to heat-exchange heat with a high-temperature, high-pressure refrigerant to the outside, the air flow should be placed in a smooth place. Here, the condenser 40 according to an embodiment of the present invention may be disposed in front of the case 10 into which air is introduced. At this time, air flows through the slit 107 to the first accommodation space S1, and external air may contact the condenser 40.

The heat radiating fan 110 is disposed on the upper surface of the case 10. In this case, the heat radiating fan 110 is disposed to face the condenser 40. The heat dissipation fan 110 may be connected to an external pipe, and heat radiated air may be discharged to the outside. In addition, when the heat radiating fan 110 is exposed as it is not connected to a separate external pipe, the case 10 may be disposed in an external space separated from the laboratory environment.

The heat radiating fan 110 radiates the condenser 40. The heat dissipation fan 110 flows air to the condenser 40 to allow the condenser 40 to radiate heat. In this case, the condenser 40 may be air cooled.

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 low pressure state as described above. The refrigerant expanded in the expansion valve 50 flows to the evaporator 60. Between the expansion valve 50 and the condenser 40 may be provided with a gas-liquid separator 80 for flowing only the refrigerant vaporized in the condenser 40 to 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 the outside air in contact with the surface.

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

The forward evaporator 610 is provided with evaporation passages 611 and 613. The evaporation passages 611 and 613 may be implemented as metal tubes through which a refrigerant flows. The evaporation passages 611 and 613 are provided such 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 passages 611 and 613 may be connected to the front supply passage LF, and the other end of the evaporation passages 611 and 613 may be connected to the front recovery passage 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 passage LR to be described later. In this case, the expansion valve 50 may be connected to the rear supply passage LR of the rear evaporator 620.

The rear evaporator 620 is provided with evaporation passages 621 and 623 similarly to the front evaporator 610. The evaporation passages 621 and 623 are provided to allow the refrigerant to flow from the lower portion 620a to the upper portion 620b of the rear evaporator 620. In this case, one end of the evaporation passages 621 and 623 may be connected to the rear supply passage LR, and the other end of the evaporation passages 621 and 623 may be connected to the rear recovery passage 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 arranged to contact the rear evaporator 620. The front evaporator 610 and the rear evaporator 620 are disposed adjacent to each other in parallel to effectively use the first accommodation space S1 of the case 10.

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 passage (LF) and the rear supply passage (LR).

The flow path switching unit 70 selectively connects the supply flow path L to the front supply flow path LF or the rear supply 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 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 not connected to the supply passage L.

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

The recovery flow path R is provided at the top of the evaporator 60. The recovery flow path R flows through the refrigerant exchanged in the evaporator 60. The recovery flow path R is connected to the compressor 30. Accordingly, the refrigerant heat exchanged in the evaporator 60 flows to the compressor 30.

The blowing fan 150 is disposed in the second accommodation 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 arrange | positioned in the 2nd accommodation space S2, and cooling efficiency is improved.

That is, the heated air is brought into contact with the condenser 40 in the first accommodating space S1, and the blower fan 150 is disposed in the second accommodating space S2 spaced apart from the first accommodating 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 to the air reaching the target temperature set by the user, thereby improving the 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 to the rear case 105. The discharge port 120 discharges the air cooled by the blower fan 150 to the outside. At this time, the cooled air is discharged to the laboratory environment along the pipe connected to the discharge port (120).

The control unit 20 controls the refrigeration cycle. The control unit 20 may control the operation of the refrigeration cycle by sensing the temperature, frost, current, and voltage detected 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 in the rear case 105. The user may control a target temperature, an operating time, and on / off of the constant temperature air conditioner through the operation unit 130.

The constant temperature air conditioner according to the exemplary embodiment of the present invention is configured to have a refrigeration cycle compactly formed in the first accommodation space S1 and the second accommodation space S2 of the case 10, and thus, may be installed in a narrow laboratory environment. It is easy and maximizes 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 perspective view of the inside of the constant temperature air conditioner according to an embodiment of the present invention, Figure 5 is an internal side view of the 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, Figure 8 is a front evaporator 610 and rear in accordance with an embodiment of the present invention 9 is a side view of the evaporator 620, and FIG. 9 is a schematic diagram of a constant temperature air conditioner according to an embodiment of the present invention, and FIG. 10 (a) is a graph showing a temperature change during degassing operation of a general air conditioner. (b) is a graph showing the temperature change during the defrosting operation of the 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 a front upper evaporation passage 613 provided in the upper portion 610b of the front evaporator 610 and the front lower evaporation passage 611 provided in the lower portion 610a of the front evaporator 610. The rear evaporator 620 includes a rear upper evaporation passage 623 provided at an upper portion 620b of the rear evaporator 620 and a rear lower evaporation passage 621 provided at a 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 cross flow passage 615 or the second cross flow passage 625 described later.

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

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

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

The first cross flow 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 passage 611 flows into the rear upper evaporation passage 623. That is, the first cross flow passage 615 allows the refrigerant to flow to the upper portion 620b of the rear evaporator 620 after the refrigerant flows to the lower portion 610a of the front evaporator 610.

The refrigerant flows to the evaporator 60 during the cooling operation by the first cross flow passage 615 through which the refrigerant flows through the front lower evaporation passage 611 of the front evaporator 610 and the rear upper evaporation passage 623 of the rear evaporator 620. Partial transfer to the rear evaporator 620 without generating the generated phenomena to the front evaporator 610, thereby improving the defrosting efficiency.

The second cross flow passage 625 connects the rear lower evaporation passage 621 to the front upper evaporation passage 613. In this case, the refrigerant flowing in the rear lower evaporation passage 621 flows into the front upper evaporation passage 613. That is, the second cross flow 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 cross flow passage 615, the second cross flow passage 625 partially transfers the implantation phenomenon occurring in the evaporator 60 during the cooling operation to the forward evaporator 610 without causing the rear evaporator 620 to be entirely generated. Therefore, the following and defrosting efficiency are improved.

Here, as described above in the prior art, in the case of a constant temperature air conditioner, the error should be controlled to within ± 1 ° C from the target temperature, the frost phenomenon that the frost (frost) is implanted in the evaporator (evaporator) when the air conditioner to operate the general air conditioner Since this occurs and precise temperature control is not possible, separate defrosting operation is performed to remove frost formed.

In this case, the defrosting operation is an operation of removing the frost formed on the evaporator by flowing the refrigerant at high temperature and high pressure in the condenser as a hot gas to the evaporator, and the cooling operation is stopped while the defrosting operation is performed. The amount of change in temperature is increased, and the energy efficiency is also reduced.

Here, as shown in (a) of FIG. 10, when defrosting by flowing a separate hot gas to the evaporator in a conventional air conditioner, the amount of temperature change is increased. 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. A temperature change of 2 ° C. or more can occur. In this case, for example, a temperature change of +2 to 3 ° C occurs as shown in FIG. Accordingly, a change may occur in a sample and a part 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 problem, in the constant temperature air conditioner according to an embodiment of the present invention, when an implantation is detected on the front evaporator 610 or the rear evaporator 620, the flow path of the refrigerant is not controlled to perform a separate defrosting operation. Perform the defrost function while performing cooling operation continuously.

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

When the flow path switching unit 70 is implemented as a three-way valve, the flow path switching unit 70 flows the refrigerant flowed into the supply flow path L into either the front supply flow path LF or the rear supply flow path LR. , Do not flow to the other one.

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 is rearward. The refrigerant is not supplied to the supply passage LR. In this case, the refrigerant flows in the front lower evaporation flow path 611 and then flows to the rear upper evaporation flow path 623 through the first intersection flow path 615. The refrigerant flowing into the rear upper evaporation passage 623 flows into the rear recovery passage RR. That is, the refrigerant flows to the lower portion 610a of the front evaporator 610 and then flows to the upper portion 620b of the rear evaporator 620 and is recovered (hereinafter, 'first flow path').

At this time, the 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 coolant is flowed and the cooling operation is performed, the implantation occurs on the surface of the evaporator 60 in which the refrigerant is expanded, and the implantation is mainly formed at the lower portion 610a of the front evaporator 610 in which the refrigerant starts to expand. Can be. In this case, implantation may occur in the front lower evaporation passage 611 and / or the lower portion 610a of the front evaporator 610.

The controller 20 may detect that an implantation has occurred in the lower portion 610a of the front evaporator 610. The controller 20 may detect that an implantation has occurred in the front lower evaporation passage 611. In this case, the lower portion 610a of the front evaporator 610 may be provided with an implantation detection sensor (not shown) for detecting an implantation.

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

When the conception is detected on the lower portion 610a of the front evaporator 610, the controller 20 controls the flow path switching unit 70 to close the front supply passage LF and open the rear supply passage LR.

That is, when the refrigerant flows in the first flow path and implantation 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 controller 20 controls the flow path switching unit 70 to turn off the supply flow path L and the front supply flow path LF. Accordingly, the refrigerant does not flow in the first flow path.

At this time, the flow path switching unit 70 opens the rear supply passage (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 then flows through the flow path switching unit 70 to the rear supply flow path LR. In this case, the refrigerant flows in the rear lower evaporation passage 621 and then flows through the second cross passage 625 to the front upper evaporation passage 613. The refrigerant flowing into the front upper evaporation passage 613 flows into the front recovery passage 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 and is recovered (hereinafter, 'second flow path').

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

At this time, as described above, since the implantation is generated in the lower portion 610a of the front evaporator 610 and / or the upper portion 620b of the rear evaporator 620, when the implantation occurs in one forward evaporator 610 Unlike implantation, separation occurs on each evaporator.

If defrosting occurs in the entire upper portion 610b and lower portion 610a of the front evaporator 610, defrosting takes a long time since defrosting is possible only when the entire front evaporator 610 is raised to a defrostable temperature.

In the constant temperature air conditioner according to the exemplary embodiment of the present invention, since the idea is separated from the lower part 610a of the front evaporator 610 and the upper part 620b of the rear evaporator 620, the refrigerant is rearwarded along the second flow path. The lower part 610a and the rear part of the front evaporator 610 in which the refrigerant is not flowed while the cooling operation is performed by flowing to the lower part 620a of the evaporator 620 and then to the upper part 610a of the front evaporator 610. The implantation of the top 620b of the evaporator 620 is removed by room temperature.

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

In addition, when the front evaporator 610 is disposed adjacent to the rear evaporator 620 in parallel, the implantation is generated in the lower part 610a of the front evaporator 610 and the upper part 620b of the rear evaporator 620. As a result, the contact efficiency between the external air and the evaporating flow path in which frosting occurs is improved, and the defrosting time is shortened.

Similarly, when the conception is detected on the lower portion 620a of the rear evaporator 620, the controller 20 controls the flow path switching unit 70 to close the rear supply passage LR and open the front supply passage LF. do.

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

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

As a result, in the constant temperature air conditioner according to the embodiment of the present invention, when an implantation occurs in the lower portion 610a of the front evaporator 610, the refrigerant flows along the second flow path and is continuously cooled to perform the first flow. Since defrosting is performed without flowing refrigerant in the path, defrosting is possible without supplying a separate hot gas during the cooling operation to perform the defrosting operation, thereby maintaining the constant temperature.

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

Supply passage (L) may be carried out separately. The first supply passage L1 connects the compressor 30 to the condenser 40. The second supply passage 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 the third supply passage (L3). In this case, the third liquid supply passage (L3) may be provided with a gas-liquid separator (80).

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

The hot gas flow path LH is branched from the first supply flow path L1. A hot gas, which is a refrigerant of a high temperature and high pressure, compressed by the compressor 30, flows through the hot gas flow path LH.

The hot gas flow path LH is provided with a hot gas valve 90. The hot gas valve 90 opens or closes the hot gas flow path LH.

Discharge temperature sensor (So) may be provided at one end of the discharge port 120 or the blowing fan (150). The discharge temperature sensor So detects the discharge temperature of the cooled and discharged air and transmits it to the control unit 20.

The controller 20 opens the hot gas valve 90 when the discharge temperature sensed by the discharge temperature sensor So is subcooled to less than an error range of the target temperature. In this case, hot gas of a high temperature and high pressure state flows into the 2nd supply flow path L2. At this time, the refrigerant and the hot gas expanded in the expansion valve 50 may be mixed.

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

The hot gas raises the temperature of the evaporator 60. That is, when the evaporator 60 is overcooled and the discharge temperature is out of the error range of the target temperature, the temperature of the evaporator 60 is raised to allow the air to be cooled within the error range of the target temperature in the evaporator 60.

Accordingly, in this case, while the constant temperature air conditioner according to the embodiment of the present invention is continuously operated for cooling, the separate hot gas is used only for the target temperature control by preventing the supercooling phenomenon of the evaporator 60, Will be maintained.

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 FIG. 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 to open and close the supply flow path L. The valve SV1, the branch flow path LB branched from the supply flow path L, and the 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 and closes the supply flow path L according to a control signal of the controller 20.

The branch flow path LB is branched from the supply flow path L. FIG. The branch passage LB is connected to the rear feed passage 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 and closes the branch flow path LB according to a control signal of the controller 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 open, the refrigerant flows along the second flow path.

At this time, the implantation phenomenon may occur in the lower part 610a of the front evaporator 610 and / or the upper part 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 in 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 by external air at room temperature is performed.

Likewise, implantation may occur on the lower portion 620a of the rear evaporator 620 and / or on 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, the cooling operation is performed while the refrigerant flows along the first flow path as described above. In this case, since the refrigerant does not flow in the second flow path, defrosting by external air at room temperature is performed.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

The scope of the present invention is indicated by the scope of the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and the equivalent concept are included in the scope of the present invention. Should be interpreted.

10 case 20 control part
30: compressor 40: condenser

Claims (10)

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 into which air is introduced; A condenser disposed in the first accommodation space and connected to the compressor by a supply passage, and disposed above the compressor; A heat dissipation fan disposed on an upper surface of the case and disposed to face the condenser and dissipating the condenser; An expansion valve connected to the supply passage to the condenser; A front evaporator disposed in the first accommodation space and connected to the expansion valve by a front supply passage; A rear evaporator disposed in the first accommodation space and disposed behind the front evaporator and connected to the expansion valve by a rear supply passage; 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 forward evaporator includes a front upper evaporation passage provided at an upper portion of the front evaporator and a front lower evaporation passage provided at a lower portion of the front evaporator. It includes a rear lower evaporation passage provided in the lower portion of the rear evaporator,
The front lower evaporation passage is connected to the front supply passage, and the rear lower evaporation passage is connected to the rear supply passage,
A first crossing passage connecting the front lower evaporating passage to the rear upper evaporating passage, and a second crossing passage connecting the rear lower evaporating passage to the front upper evaporating passage,
The controller controls the flow path switching unit to close the front supply flow path and open the rear supply flow path when an implantation is detected at a lower portion of the front evaporator.
The method of claim 1,
The flow path switching unit is a constant temperature air conditioner comprising a three-way valve.
The method of claim 1,
The forward evaporator is a constant temperature air conditioner disposed in parallel adjacent to the rear evaporator.
delete delete delete delete The method of claim 1,
And a refrigerant flows into the rear supply passage and flows from the rear lower evaporation passage to the front upper evaporation passage through the second crossing passage.
The method of claim 1,
The supply passage,
A first supply passage connecting the compressor to the condenser; And
A second supply passage connecting the expansion valve to the flow path switching unit;
Constant temperature air conditioner comprising a.
The method of claim 9,
And a hot gas flow passage branched from the first supply flow passage and connected to the second supply flow passage.

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