KR20240061502A - Refrigerant Circulation Cycle Defrosting Device Using Hot Gas And Refrigeration System Employing The Same - Google Patents

Abstract

The present invention is a refrigerant circulation cycle using hot gas that can effectively defrost the frost or ice layer accumulated on the surface of the evaporator in a refrigeration system equipped with a refrigerant circulation cycle using hot gas, lowering the operating load of the compressor and increasing durability. It relates to a defrost device and a refrigeration system employing the same.

Description

Refrigerant Circulation Cycle Defrosting Device Using Hot Gas And Refrigeration System Employing The Same}

The present invention can effectively defrost the frost (or ice) layer accumulated on the surface of the evaporator in a refrigeration or refrigeration system equipped with a refrigerant circulation cycle (hereinafter collectively referred to as "refrigeration system") using hot gas, and reduces the operating load of the compressor. It relates to a refrigerant circulation cycle defrost device using hot gas that can reduce temperature and increase durability and a refrigeration system employing the same.

The present invention will exemplify the use of a refrigeration system with a refrigerant circulation cycle installed in a large refrigerated (or refrigerated) warehouse for long-term storage of agricultural and marine products (or food including food before and after processing) in large quantities.

In the above-mentioned refrigeration system, when refrigerant gas circulates along the refrigerant circulation system, moisture contained in the air continues to condense on the surface of the above-mentioned cooling fins in the process of heat exchange with air passing between cooling fins of the evaporator. As a result, moisture accumulates thicker on the surface of the cooling fin, which leads to a problem that reduces the heat exchange efficiency of the evaporator.

This problem can be referred to in Korean Patent Publication No. 10-2009-0066690 (Patent Document 1) and Korean Patent Publication No. 10-2009-0133015 (Patent Document 2) since they propose a solution to this problem.

The above-mentioned Patent Document 1 is a defrost device for removing frost accumulated on the surface of an evaporator in a refrigerant circulation cycle,

A defrost heater installed at the bottom of the evaporator and having a glass tube containing a heating element that generates heat;

A heater cover that protects the glass tube of the defrost heater, a defrost water receiver that accommodates the ice layer falling by the electric defrost heater and discharges it into the drain at the same time;

A defrost device for a refrigerator including an optical sensor unit that irradiates light to the defrost water receiver to check the ice layer,

Patent Document 2 above,

A defrost heater is disposed on both sides of the evaporator and has a heating wire inside to heat the frost generated in the evaporator, and one end is connected between the lower end of the defrost heater and a drain hole is provided at the other end to form a drain plate. A defrosting device for a refrigerator is characterized by including a heater for removing remaining ice that is in contact with the bottom surface of the drain dish so as to communicate with the water discharge pipe and has a heating wire inside to heat the remaining ice generated in the evaporator.

However, the defrost devices disclosed in Patent Documents 1 and 2 above have the disadvantage of increasing operating costs if the refrigeration system continues to operate because the power consumption due to operation of the heater is large.

Typically, defrost methods include electric defrost, water defrost, on-brine defrost, and hot gas defrost.

In most refrigeration systems, the above-mentioned on-brine defrost method is adopted only for very special purposes due to brine concentration or other management issues, but most of them adopt the electric defrost method and the water defrost method.

The electric defrosting method described above is a defrosting method with high power consumption because it implements defrosting using heat from a heater generated by a power source in a short period of time.

In other words, electric heaters applied to electric defrost are manufactured by filling a stainless steel tube on the outside with nichrome wire and insulation on the inside. The lower the required temperature and the greater the amount to be defrosted, the amount of heat required increases, so the amount of power used must be increased. In addition, the heater's coating can be damaged by its own heat, which has the potential to cause a fire or short circuit (or malfunction). It also has the disadvantage of requiring a long defrost time and causing icicles on the evaporator to suddenly fall due to overheating. However, there are inherent problems that can cause accidents.

Meanwhile, the water defrost method described above is difficult to use in areas with a lot of limestone or foreign substances. The reason for this is that limescale or foreign matter accumulates or adheres inside the water tank, the water pipe pipe, or the coil of the heat exchanger, narrowing the water pipe or pipe.

Against this background, when adopting the water defrost method, there is an economic disadvantage of requiring a large facility site and having a high-cost water treatment facility (removal of limescale and foreign substances) and a high-performance pump to avoid the above-mentioned problems. In addition, when the pump is stopped, frost may accumulate and the freshness of stored products (refrigerated or frozen products) may decrease due to a decrease in heat exchange performance, so more careful management and operation are required, and condensation of wet steam may occur due to the temperature difference between the water temperature and the refrigerator. There is potential for a major accident to follow.

Meanwhile, the above-mentioned hot gas defrost method flows the high-temperature and high-pressure refrigerant gas discharged from the compressor into the coil of the heat exchanger (evaporator) via a drain plate (a plate or tank that drains the melted defrost water when defrosting the heat exchanger coil). This is a method that removes frost created on the drain plate and coil as it circulates with the heat of hot gas.

However, this method has a distinct problem in that the temperature drops as the heat of the high-temperature refrigerant gas passing through the drain plate is exchanged with the low-temperature phase, so the defrost time is delayed or prolonged even if the compressor is driven. This causes wear of the sealing parts and pistons of expensive compressors, shortening the lifespan.

In addition, since the hot gas induction pipe is disposed toward the evaporator on the upper side via the drain plate on the lower side of the evaporator, there is a problem of condensation when hot gas passes through the lower part of the drain plate, and also when defrosting the frost with hot gas, the pump Since some of the refrigerant gas is used after downing, not only is the amount of refrigerant insufficient, but the temperature of the heat generated is also low, and the compressor is overwhelmed, which has the distinct problem of lengthening the defrost time.

In addition, the hot gas defrost method collects refrigerant in a high-temperature and high-pressure container (receiver) before stopping the machine, so trying to generate heat only with the remaining refrigerant gas reduces the amount of refrigerant returned to the compressor, creating a load on the compressor. , In addition, there is a distinct problem that the load on the compressor increases because the refrigerant pressure that performs the defrost function increases and enters the compressor.

The present invention was created to solve the problems described above, and has achieved remarkable results, so it is proposed through the present invention.

Republic of Korea Patent Publication No. 10-2009-0066690 Republic of Korea Patent Publication No. 10-2009-0133015 Republic of Korea Patent Publication No. 10-2012-0022203

The present invention is a refrigerant circulation cycle using hot gas that can effectively defrost the frost or ice layer accumulated on the surface of the evaporator in a refrigeration (or refrigeration) system equipped with a refrigerant circulation cycle using hot gas and can lower the operating load of the compressor. The purpose is to provide a defrost device and a refrigeration system employing it.

The solution for implementing the purpose of the present invention is

[First Example]

In the refrigeration system (10) with a refrigerant circulation cycle,

The refrigeration system 100 further includes a defrosting evaporator 150,

The above-mentioned defrosting evaporator 150,

A fourth bypass line (B4) branched from the refrigerant evaporation line (141) equipped with the fourth solenoid valve (S4) is connected;

Equipped with a sixth solenoid valve (S6) and connected to a fifth bypass line (B5) connected to the refrigerant evaporation line (141),

It is characterized in that it includes a second bypass line (B2) connected between the receiver (120a) and the fourth bypass line (B4).

The above-mentioned defrosting evaporator 150 may further include a third bypass line (B3) forming a closed circuit so that the refrigerant repeatedly circulates inside the evaporator.

The third bypass line (B3) described above includes a seventh solenoid valve (S7) and a one-way check valve (C1).

According to the first embodiment, the pipes of the fifth and sixth solenoid valves (S5) and (S6) are controlled (On) to be opened (in this case, the first and fourth solenoid valves (S4) and maintained in a closed state (Off). ), the refrigerant flowing through the evaporator 140 flows toward the compressor 110 through the defrosting evaporator 140, and at the same time, the refrigerant stored in the receiver (120a) flows through the second bypass line (B2) and the fourth Since the water is supplied into the evaporator 150 for defrosting through the bypass line (B3), frosting of the evaporator 150 for defrosting can be removed by the latent heat of each refrigerant passing through the evaporator 150 and the receiver 120a. Also, by selective control (On) or full control (On) of the fifth solenoid valve (S5) or / and the eighth solenoid valve (S8) through the evaporator 140 or / and the receiver (120a) Frosting of the defrosting evaporator 150 can be removed using a refrigerant.

The above-described defrosting evaporator 150,

It may further include a third bypass line (B3) equipped with a seventh solenoid valve (s7) for opening and closing the pipe and connected between the fifth bypass line (B5) and the second bypass line (B2) to form a closed circuit. You can.

In the above-mentioned closed circuit, when the ducts of the 7th and 8th solenoid valves (S7) (S8) are controlled (On) to open, the refrigerant passing through the receiver passes through the 2nd, 4th, 5th, and 7th bypass lines. You can cycle along.

[Second Embodiment]

Assuming the refrigeration system 100 according to the first embodiment described above

A refrigerant condensation line (122) equipped with a first solenoid valve (S1) for opening and closing the pipe, and connected between the above-described receiver (120a) and the expansion valve (130);

A first bypass line (B1) equipped with a third solenoid valve (S3) for opening and closing the pipe, branched from the above-described refrigerant compression line (111) and connected between the compressor (110) and the expansion valve (130);

It is equipped with a second solenoid valve (S2) for opening and closing the pipe, and may further include a refrigerant compression line (111) connected to the condenser between the third solenoid valve (S3) and the compressor (110).

According to the second embodiment, the high-temperature, high-pressure refrigerant discharged from the compressor 110 is transferred to the condenser 120 and the expansion valve 130 by selective control (On) of the first to third solenoid valves (S1 to S3). ), or the pipe can be controlled (On) so that the refrigerant flows directly into the evaporator 140 without passing through the condenser 120 described above.

That is, the high-temperature, high-pressure refrigerant discharged from the compressor 110 directly passes through the evaporator 140 and the defrost evaporator 150 and then controls the pipe line to return to the condenser 110 or the condenser 120 and the expansion valve ( The pipe can be controlled to sequentially pass through the evaporator 130), the evaporator 140, and the defrost evaporator 150.

In the former case, not only can the defrost function of the evaporator 150 for defrosting be implemented by using the phase of the refrigerant passing through the evaporator 140, but also the operating load of the compressor 110 can be reduced.

The first to eighth solenoid valves (S1 to S8) described above are closed electric valves that are controlled (On) to open the pipe by the controller of the refrigeration system 100, and are used to set the temperature of the refrigeration system and the temperature sensor (in the drawing) It can be selectively controlled (On) by a controller (not shown) for a time set in a timer (not shown) in response to the sensing value (not shown).

The above-mentioned defrosting evaporator 150 is

In a refrigeration system with a refrigerant circulation cycle,

A refrigeration system (100) including a defrost evaporator (150),

The above-described defrosting evaporator 150,

It is equipped with a plurality of cooling fins 154 connected from top to bottom between both side walls 153, one end 151 is connected to the fourth bypass line B4, and the other end 152 is connected to the fourth bypass line. An evaporation coil (150a) connected to (B5);

A blowing fan 155 mounted on the front of the evaporation coil 150a;

A louver 156 installed to be openable and closed on the front of the blowing fan 155; and

It is characterized by a refrigeration system including a fixing plate 157 installed below the evaporation coil 150a.

According to the present invention, the frosting of the evaporator that occurs while operating a large-capacity refrigeration system for a long period of time can be quickly and efficiently removed through a defrosting evaporator, and not only can defrosting be selectively performed according to the time required for defrosting using a timer, etc. Defrosting can be done quickly using room temperature refrigerant, and has the effect of significantly reducing the load on the compressor.

Figure 1 is a configuration diagram showing a general refrigerant circulation cycle.
Figure 2 is a configuration diagram showing a hot gas defrost device for refrigeration according to a preferred embodiment of the present invention.
Figure 3 is a perspective view showing the evaporator for defrosting employed in the present invention.
FIG. 4 is a side view of the defrosting evaporator shown in FIG. 3, illustrating the hot gas circulation system and the refrigerant gas circulation system.
Figure 5 is a view showing the evaporator for defrosting shown in Figure 3, of which Figure 5a is a front view of the evaporator, and Figure 5b is a right side view.
Figure 6 is a perspective view showing the main part of the insulation structure installed in the defrost water discharge system of the defrost evaporator shown in Figure 5.

All references, including publications, patent applications, and patents, cited herein are the same as if each reference were individually and expressly indicated to be incorporated by reference and were set forth in its entirety herein. To this extent, they are incorporated herein by reference.

In the context of describing the invention (and especially in the context of the claims below), the use of the singular referents and "at least one" and similar referents refers to both the singular and the plural, unless otherwise indicated herein or clearly contradictory from the context. It is interpreted as including. The use of the term “at least one” following a list of one or more items (e.g., “at least one of A and B”) means that the listed items, unless otherwise indicated herein or clearly contradictory from context, It should be interpreted to mean one item (A or B) selected from, or a combination of two or more of the listed items (A and B). The terms “comprising,” “having,” “including,” and “containing” are, unless otherwise stated, open terms (i.e., “including but not limited to”). It should be interpreted as meaning).

Recitation of ranges of values herein is intended to serve as a shorthand way of referring individually to each individual value falling within the range, unless otherwise indicated herein, and each individual value is referred to as Incorporated herein as if individually set forth herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context.

The use of any or all examples or exemplary language (e.g., “such as”) provided herein is merely to better illustrate the invention and does not limit the scope of the invention unless otherwise claimed. . No language in the specification should be construed as indicating that any non-claimed element is essential to the practice of the invention.

Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention.

However, since the description of the present invention is only an example for structural and functional explanation, the scope of the present invention should not be construed as limited by the embodiments described in the text.

For example, since the embodiments can be modified in various ways and can take various forms, the scope of rights of the present invention should be understood to include equivalents that can realize the technical idea.

In addition, the purpose or effect presented in the present invention does not mean that a specific embodiment must include all or only such effects, so the scope of the present invention should not be understood as limited thereby.

In this specification, the present embodiments are provided to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention. And the present invention is only defined by the scope of the claims.

Accordingly, in some embodiments, well-known components, well-known operations and well-known techniques are not specifically described in order to avoid ambiguous interpretation of the present invention.

Meanwhile, the meaning of the terms described in the present invention is not limited to the dictionary meaning and should be understood as follows.

All terms used herein, unless otherwise defined, have the same meaning as commonly understood by a person of ordinary skill in the field to which the present invention pertains.

Terms defined in commonly used dictionaries should be interpreted as consistent with the meaning they have in the context of the related technology, and cannot be interpreted as having an ideal or excessively formal meaning unless clearly defined in the present invention.

Hereinafter, in explaining a preferred embodiment of a refrigerant circulation cycle defrost device using hot gas according to the present invention and a refrigeration system employing the same, a refrigeration system including a defrost evaporator will first be described to facilitate understanding of the present invention. , the evaporator for defrosting will be described later.

In addition, Figure 1 is a diagram showing the configuration of a known refrigeration system, and is attached to contrast the structural differences with the present invention. Configurations identical to those defined in the present invention are denoted by the same symbols.

As shown in FIG. 1, the conventional refrigeration system 10 includes a compressor 110 that compresses the refrigerant into a high-temperature, high-pressure gaseous state, and a condenser that performs heat exchange between the refrigerant flowing from the compressor 110 and an external heat source. (120), an expansion valve 130 that adiabatically expands the liquid refrigerant flowing in from the condenser 120 and converts it into a mixed refrigerant of low temperature and low pressure liquid and gas phase, and inflow from the expansion valve 130 It includes an evaporator 140 that converts the low-temperature, low-pressure refrigerant into a low-pressure gaseous state by exchanging heat with an external heat source and flows it into the compressor 110.

It includes a defrosting evaporator 150 that allows defrosting to occur with room temperature and low pressure refrigerant from a receiver 120a that stores the refrigerant that has passed through the compressor 110 and the refrigerant that has passed through the condenser 120.

1 and 2, reference numeral 110 denotes a compressor that compresses refrigerant gas at high temperature and high pressure, 120 denotes a condenser 120 that condenses the refrigerant gas compressed by the compressor 111, and 120a denotes condenser 120. is a receiver that temporarily stores refrigerant gas via It is an evaporator equipped with cooling fins and connected to re-supply the refrigerant that has exchanged heat with the air passing between the cooling fins to the compressor 111.

In FIG. 1, reference numeral 111 denotes a refrigerant compression line 111 connected between the compressor 110 and the condenser 120, and 121 denotes a first refrigerant condensation line 120a connected between the condenser 120 and the receiver 120a. , 122 is a second refrigerant condensation line connected between the receiver 120a and the expansion valve 130, 131 is a refrigerant expansion line connected between the expansion valve 130 and the evaporator 140, and 141 is a second refrigerant expansion line connected between the evaporator 140. ) and the refrigerant evaporation line 141 connected between the compressor 110.

The above-described first and second refrigerant condensation lines (120a) (122) are each equipped with first and second opening/closing valves (V1) and (V2) to control the flow of refrigerant.

The refrigerant gas repeatedly circulates through the compressor 110, condenser 120, receiver 120a, expansion valve 130, and evaporator 140 in that order, heat-exchanging indoor air passing through the evaporator 140, and heat-exchanging cold air. is blown into the frozen (or refrigerated) storage.

Since the phase change of the refrigerant according to the refrigerant circulation in the above-described refrigeration system 10 is well known, detailed description will be omitted.

Figure 2 is a configuration diagram showing the overall configuration of a refrigeration system employing a defrost evaporator according to a preferred embodiment of the present invention. The refrigeration system 100 according to the present invention is the refrigeration system 10 shown in Figure 1 and the defrost system. Includes an evaporator (150).

[First Example]

In the refrigeration system (10) with a refrigerant circulation cycle,

The refrigeration system 100 further includes a defrosting evaporator 150,

The above-described defrosting evaporator 150,

A fourth bypass line (B4) branched from the refrigerant evaporation line (141) equipped with the fourth solenoid valve (S4) is connected;

Equipped with a sixth solenoid valve (S6) and connected to a fifth bypass line (B5) connected to the refrigerant evaporation line (141),

It is characterized in that it includes a second bypass line (B2) connected between the receiver (120a) and the fourth bypass line (B4).

The above-mentioned defrosting evaporator 150 may further include a third bypass line (B3) forming a closed circuit so that the refrigerant repeatedly circulates inside the evaporator.

The above-described third bypass line (B3) includes a seventh solenoid valve (S7) and a one-way check valve (C1).

According to the first embodiment, the pipes of the fifth and sixth solenoid valves (S5) and (S6) are controlled (On) to be opened (in this case, the first and fourth solenoid valves (S4) and maintained in a closed state (Off). ), the refrigerant flowing through the evaporator 140 flows toward the compressor 110 through the defrosting evaporator 140, and at the same time, the refrigerant stored in the receiver (120a) flows through the second bypass line (B2) and the fourth Since the water is supplied into the evaporator 150 for defrosting through the bypass line (B3), frosting of the evaporator 150 for defrosting can be removed by the latent heat of each refrigerant passing through the evaporator 150 and the receiver 120a. Also, by selective control (On) or full control (On) of the fifth solenoid valve (S5) or / and the eighth solenoid valve (S8) through the evaporator 140 or / and the receiver (120a) Frosting of the defrosting evaporator 150 can be removed using a refrigerant.

The above-mentioned defrosting evaporator 150,

It may further include a third bypass line (B3) equipped with a seventh solenoid valve (s7) for opening and closing the pipe and connected between the fifth bypass line (B5) and the second bypass line (B2) to form a closed circuit. You can.

In the above-mentioned closed circuit, when the ducts of the 7th and 8th solenoid valves (S7) (S8) are controlled (On) to be opened, respectively, the refrigerant passing through the receiver (120a) is transferred to the 2nd, 4th, 5th, and 7th solenoid valves. It can circulate along the bypass line.

Accordingly, the above-mentioned defrosting evaporator 150 may be defrosted by refrigerant that has passed through the compressor 110 or by refrigerant of room temperature and low pressure stored in the receiver 120a after passing through the condenser 120.

A second solenoid valve (S2) is installed in the above-mentioned refrigerant compression line 111 to control the flow of refrigerant moving to the condenser 120.

The above-described second solenoid valve (S2) blocks the refrigerant moving to the condenser 120, thereby allowing the refrigerant moving through the refrigerant compression line 111 to move to the expansion valve 130.

Additionally, a first bypass line (B1) may be provided in the refrigerant compression line 111 to directly supply refrigerant to the expansion valve 130.

The above-described first bypass line (B1) may include a third solenoid valve (S3) for opening and closing the pipe.

That is, the second solenoid valve (S2) is maintained in an open state so that the refrigerant moves to the condenser 120 by the refrigerant circulation cycle, and when defrosting, the second solenoid valve (S2) is switched to the closed state.

The third solenoid valve (S3) is normally closed and opens when refrigerant is supplied to the defrosting evaporator (150). The third solenoid valve (S3) is switched to the open state when the second solenoid valve (S2) is switched to the closed state, so that the refrigerant of the compressor (110) flows along the first bypass line (B1).

In addition, the second refrigerant condensation line 122 is provided with a first solenoid valve (S1) that regulates the refrigerant flow of the receiver (120a). The first solenoid valve (S1) is normally kept open and then defrosts. When operating, it switches to a closed state.

That is, the first solenoid valve (S1) is closed during a defrost operation to block the refrigerant in the receiver (120a) from moving to the expansion valve (130).

A fourth bypass line (B4) is connected to the refrigerant evaporation line 141 of the evaporator 140 to supply the refrigerant that has passed through the evaporator 140, and the refrigerant that has passed through the defrosting evaporator 150 is connected to the compressor. A fifth bypass line (B5) may be connected between the defrosting evaporator 150 and the compressor 110 to be moved to (110).

Additionally, a third bypass line (B3) may be provided in the fourth bypass line (B4) to supply refrigerant from the receiver (120a). The fifth bypass line (B5) and the third bypass line (B3) may be connected to the third bypass line (B3).

The refrigerant stored in the receiver (120a) may flow into the defrosting evaporator 151 through the third bypass line (B3), and the refrigerant passing through the defrosting evaporator 150 may flow into the third bypass line (B3). ) and can be re-introduced into the second bypass line (B2) and repeatedly circulated through the defrosting evaporator 150.

A fourth solenoid valve (S4) is installed in the refrigerant evaporation line 141 to control the flow of refrigerant moving to the compressor 110, and the fourth solenoid valve (S4) is normally frozen (or refrigerated). It is maintained in an open state to allow the refrigerant to flow into the defrosting evaporator 150 during defrosting.

In addition, a fifth solenoid valve (S5) is installed in the fourth bypass line (B4) to control the flow of refrigerant to the defrost evaporator 150, and the fifth solenoid valve (S5) is normally maintained in a closed state. However, when defrosting, it switches to the open state.

In addition, the fifth bypass line (B5) may include a sixth solenoid valve (S6) that regulates the flow of refrigerant.

The above-mentioned sixth solenoid valve (S6) is normally maintained in a closed state, but is switched to an open state during a defrosting operation so that the refrigerant that has passed through the defrosting evaporator 150 flows into the compressor 110.

In addition, as described above, the third bypass line (B3) controls the opening and closing of the third bypass line (B3) so that the refrigerant in the fifth bypass line (B5) is combined with the refrigerant supplied from the receiver (120a). A seventh solenoid valve (S7) is installed.

The seventh solenoid valve (S7) is opened and closed as necessary to mix the refrigerant that has passed through the defrosting evaporator (150) and the refrigerant supplied from the receiver (120a).

That is, when it is desired to increase the amount of refrigerant in the defrost evaporator 150, the refrigerant in the receiver 120a and the refrigerant that has passed through the defrost evaporator 150 are opened to move to the third bypass line B3. , when it is desired to maintain the amount of refrigerant in the defrosting evaporator 150, the seventh solenoid valve (S7) is closed.

In addition, a first check valve (C1) is installed in the above-described third bypass line (B3) to prevent the refrigerant from flowing back into the receiver (120a), and to prevent the refrigerant from flowing back into the third bypass line (B3). A second check valve (C2) is installed.

The check valve (C!, C2) is a positive pressure valve through which refrigerant flows in only one direction, and this valve causes the refrigerant to flow at positive pressure.

Meanwhile, the refrigerant supplied from the receiver 120a flows into the defrosting evaporator 150 at room temperature and under low pressure, allowing frost, etc. to be quickly removed.

[Second Embodiment]

Assuming the refrigeration system 100 according to the first embodiment described above

A refrigerant condensation line (122) equipped with a first solenoid valve (S1) for opening and closing the pipe, and connected between the above-described receiver (120a) and the expansion valve (130);

A first bypass line (B1) equipped with a third solenoid valve (S3) for opening and closing the pipe, branched from the above-described refrigerant compression line (111) and connected between the compressor (110) and the expansion valve (130);

It is equipped with a second solenoid valve (S2) for opening and closing the pipe, and may further include a refrigerant compression line (111) connected to the condenser between the third solenoid valve (S3) and the compressor (110).

According to the second embodiment, the high-temperature, high-pressure refrigerant discharged from the compressor 110 is transferred to the condenser 120 and the expansion valve 130 by selective control (On) of the first to third solenoid valves (S1 to S3). ), or the pipe can be controlled (On) so that the refrigerant flows directly into the evaporator 140 without passing through the condenser 120 described above.

That is, the high-temperature, high-pressure refrigerant discharged from the compressor 110 directly passes through the evaporator 140 and the defrost evaporator 150 and then controls the pipe line to return to the condenser 110 or the condenser 120 and the expansion valve ( The pipe can be controlled to sequentially pass through the evaporator 130), the evaporator 140, and the defrost evaporator 150.

In the former case, not only can the defrost function of the evaporator 150 for defrosting be implemented by using the phase of the refrigerant passing through the evaporator 140, but also the operating load of the compressor 110 can be reduced.

The first to eighth solenoid valves (S1 to S8) described above are closed electric valves that are controlled (On) to open the pipe by the controller of the refrigeration system 100, and are used to set the temperature of the refrigeration system and the temperature sensor (in the drawing) It can be selectively controlled (On) by a controller (not shown) for a time set in a timer (not shown) in response to the sensing value (not shown).

Hereinafter, a preferred embodiment of the defrosting evaporator employed in the present invention will be described with reference to the attached drawings.

Figure 3 is a perspective view showing the evaporator 150 for defrosting employed in the present invention, and Figures 4, 5a, and 5b are sequentially one side view, front view, and right side view of the evaporator for defrost.

The defrost evaporator 150 includes an evaporation coil 150a (FIGS. 3, 4) equipped with a plurality of cooling fins 154 connected to be disposed from top to bottom between both side walls 153, and the evaporation coil 150a. It includes a blowing fan 155 (FIG. 4) mounted on the front, a louver 156 installed in an openable manner on the front of the blowing fan 155, and a fixing plate 157 installed on the lower part of the evaporation coil 150a described above. .

One end (151) of the above-described evaporation coil (150a) is connected to the fourth bypass line (B4), and the other end (152) is connected to the fourth bypass line (B5).

When connecting both ends 151 and 152 of the above-described evaporation coil 150a with the fourth and fifth bypass lines B4 and B5, the refrigerant can be distributed into the evaporator 150 for defrosting. A manifold pipe (not shown) may be employed.

The blowing fan 155 described above is controlled to be driven during the defrosting operation of the defrosting evaporator, allowing air to pass between cooling fins.

At this time, the louver 156 is automatically opened around the hinge by the air pressure generated by the blowing fan 155 (see Figure 5b), and when the blowing fan 155 stops, the louver 156 is hinged (not shown). It closes around (see Figure 5a).

As shown in FIGS. 6 and 7, the above-mentioned fixing plate 157 has a drain plate 158a with a drain hole 158 installed therein at an angle (see FIG. 5A), and a hot plate is installed on the upper side of the drain plate 158a. A hot gas line (163, piping) through which gas (refrigerant) passes is provided, and a jacket (162) made of insulating material is provided around it, and is coupled to the outer surface of the jacket (162) to form the jacket (162) described above. Includes a protective plate 161 to protect.

The above-described jacket 162 may have a hole 162a in communication with the drain plate 158a on the bottom surface or may be open.

Accordingly, the defrost water that falls on the aforementioned drain plate may be discharged to the outside through the drain hole 158 along the inclined drain plate.

The above-mentioned defrosting evaporator 150 has distribution wings for limiting the amount of air inflow and distributing the incoming air on the defrosting evaporator surface symmetrical to the blowing fan 155, that is, the surface where air enters between the evaporation coils 150a. It may further include a cover 159 equipped with (159a).

The cover 159 described above covers the rear of the defrosting evaporator, but is provided with an inlet 159b at the bottom through which air can flow.

A plurality of the above-described blades 159a may be installed inside the inlet 159b as shown in FIG. 4, and each of them may be arranged at a different angle.

Meanwhile, the above-described hot gas line 163 may be composed of a plurality of components connected to each other, and the refrigerant flowing into the hot gas line 163 may be branched and connected to a specific line constituting the refrigeration system 100. there is.

Accordingly, the defrost water that falls due to the refrigerant flowing along the hot gas line 163 may be evaporated.

In the above, the present inventor has described preferred embodiments of the present invention in detail with reference to the attached drawings, but this is only an illustrative description to aid understanding of the present invention and those skilled in the art Any person may make various modifications or applications based on the present invention, but it is recognized in advance that such modifications and application examples are included in the scope of rights defined in the following claims and the true technical idea intended by the present inventor. I want to make this clear.

110: Compressor 111: Refrigerant compression line
120: Condenser 121a: Water receiver
122: first refrigerant condensation line 124: second refrigerant condensation line
130: expansion valve 140: evaporator
150: Evaporator for defrosting
C1,C2: 1st and 2nd check valves
B1 to B5: 1st to 5th bypass lines
V1, V2: 1st and 2nd on/off valves

Claims (8)

In a refrigeration system with a refrigerant circulation cycle,
A refrigeration system (100) including a defrost evaporator (150),
The defrosting evaporator 150,
It is equipped with a plurality of cooling fins 154 connected from top to bottom between both side walls 153, one end 151 is connected to the fourth bypass line B4, and the other end 152 is connected to the fourth bypass line. An evaporation coil (150a) connected to (B5);
A blowing fan 155 mounted on the front of the evaporation coil 150a;
A louver 156 installed to be openable and closed on the front of the blowing fan 155; and
A refrigerant circulation cycle defrost device using hot gas and a refrigeration system employing the same, comprising a fixing plate (157) installed below the evaporation coil (150a). According to paragraph 1,
The fixing plate 157 is,
a drain plate (158a) equipped with a drain hole (158) therein and installed inclined at a predetermined angle;
A hot gas line 163 for hot gas circulation disposed on the upper side of the drain plate 158a, and
a thermal insulation jacket 162 surrounding the hot gas line;
A refrigerant circulation cycle defrost device using hot gas and a refrigeration system employing the same, comprising a protective plate (161) coupled to the outer surface of the jacket (162) to protect the jacket (162). According to paragraph 1,
The defrosting evaporator 150,
A refrigerant circulation cycle defrost device using hot gas, characterized in that a cover is further attached to the air inlet surface, and a refrigeration system employing the same. According to clause 3,
The cover further includes blades disposed at different angles inside the inlet. A refrigerant circulation cycle defrost device using hot gas and a refrigeration system employing the same. In the refrigeration system (10) with a refrigerant circulation cycle,
The refrigeration system 100 further includes a defrosting evaporator 150,
The above-mentioned defrosting evaporator 150,
Connected to the fourth bypass line (B4) branched from the refrigerant evaporation line (141) equipped with the fourth solenoid valve (S4),
Equipped with a sixth solenoid valve (S6) and connected to a fifth bypass line (B5) connected to the refrigerant evaporation line (141),
A refrigerant circulation cycle defrost device using hot gas, characterized in that it includes a second bypass line (B2) connected between the receiver (120a) and the fourth bypass line (B4), and a refrigeration system employing the same. According to clause 5,
The defrosting evaporator 150,
It is equipped with a seventh solenoid valve (s7) for opening and closing the pipe and further includes a third bypass line (B3) connected between the fifth bypass line (B5) and the second bypass line (B2) to form a closed circuit. A refrigerant circulation cycle defrost device using hot gas and a refrigeration system employing the same. According to clause 5,
The third bypass line (B3) further includes a seventh solenoid valve (S7) and a one-way check valve (C1). A refrigerant circulation cycle defrost device using hot gas and a refrigeration system employing the same. In the refrigeration system (10) with a refrigerant circulation cycle,
The refrigeration system 100 further includes a defrosting evaporator 150,
The defrosting evaporator 150,
A refrigerant condensation line (122) equipped with a first solenoid valve (S1) for opening and closing the pipe, and connected between the above-described receiver (120a) and the expansion valve (130);
A first bypass line (B1) equipped with a third solenoid valve (S3) for opening and closing the pipe, branched from the above-described refrigerant compression line (111) and connected between the compressor (110) and the expansion valve (130);
Equipped with a second solenoid valve (S2) for opening and closing the pipe, and a refrigerant compression line (111) connected to the condenser between the third solenoid valve (S3) and the compressor (110) using hot gas. Refrigerant circulation cycle defrost device and refrigeration system employing it.

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