阅读说明：本技术 使用速冻室、冷冻室和冷藏室的3级冷却和除霜系统 (3-stage cooling and defrost system using quick freezing chamber, freezing chamber and refrigerating chamber ) 是由 朴镇燮 朴相冕 于 2018-01-16 设计创作，主要内容包括：本发明涉及一种用于冷却-40～-30℃的速冻室、-20～-15℃的冷冻室、0～5℃的冷藏室等的系统,以及用于使用冷凝废热对速冻室、冷冻室和冷藏室进行除霜的节能除霜系统。(The present invention relates to a system for cooling a quick freezing chamber of-40 to-30 ℃, a freezing chamber of-20 to-15 ℃, a refrigerating chamber of 0 to 5 ℃ and the like, and an energy-saving defrosting system for defrosting the quick freezing chamber, the freezing chamber and the refrigerating chamber using waste condensation heat.)

1. A 3-stage cooling and energy-saving defrost system using a-40 to-30 ℃ quick-freezing chamber, a-20 to-15 ℃ freezing chamber and a 0 to 5 ℃ refrigerating chamber, said system comprising the following 3-stage cooling steps:

1) a quick-freezing step of-40 to-30 ℃ in the quick-freezing chamber, wherein a liquid-phase refrigerant which is compressed by 2 stages and then is sprayed out from an electronic valve (S3) far away from a condenser is evaporated, and then an ultralow-temperature liquid-phase refrigerant is further evaporated in sequence until the temperature of the quick-freezing chamber is lower than-40 ℃;

2) a freezing step of-20 to-15 ℃ in the freezing chamber, in which the refrigerant injected from the electronic valve (R1) after being recovered from the quick freezing chamber is evaporated after closing the electronic valve (V1), and the liquid-phase refrigerant sprayed from the electronic valve (S2) away from the condenser can be further evaporated until the freezing chamber is-20 ℃; and

3) and a 0-5 ℃ refrigeration step in the refrigerating chamber, wherein the refrigerant injected from the electronic valve (R2) after being recovered from the quick freezing chamber and/or the freezing chamber is evaporated after the electronic valve (V2) is closed, and the liquid-phase refrigerant sprayed from the electronic valve (S1) far away from the condenser can be further evaporated until the refrigerating chamber is 0 ℃.

2. The stage 3 cooling and defrosting system of claim 1 wherein the configuration of the stage 3 cooling system comprises:

1) a multi (2) stage compressor including a low stage compressor for compressing a vapor phase refrigerant to an intermediate pressure, an intercooler for cooling the refrigerant up to a saturation temperature corresponding to the intermediate pressure, and a high stage compressor for compressing the cooled refrigerant to a high pressure and high temperature vapor phase refrigerant;

2) a condenser for condensing the high-pressure and high-temperature vapor-phase refrigerant from the compressor into a liquid-phase refrigerant;

3) a flash evaporator for flash freezing the chamber using a liquid-phase refrigerant from the condenser;

4) a freezing evaporator for freezing the chamber using liquid-phase refrigerant from the condenser and/or vapor-phase refrigerant recovered from the flash chamber; and

5) a refrigeration evaporator for refrigerating the chamber using liquid phase refrigerant from the condenser and/or vapor phase refrigerant recovered from the flash and/or freezer compartments.

3. The stage 3 cooling and defrosting system of claim 1 or 2 wherein the stage 3 cooling system comprises the steps of:

1) a quick-freezing step of-40 to-30 ℃ in the quick-freezing chamber, wherein the low-temperature liquid-phase refrigerant sprayed out of the expansion valve (1) after 2-stage compression and passing through the electronic valves (a, b) far away from the condenser is evaporated until the temperature of the quick-freezing chamber is-25 ℃, and then the ultra-low-temperature liquid-phase refrigerant sprayed out of the expansion valve (2) in sequence is evaporated until the temperature of the quick-freezing chamber is lower than-40 ℃;

2) a freezing step of-20 to-15 ℃ in a freezing chamber, in which a vapor phase refrigerant injected from an electronic valve (7) after being recovered from a quick freezing chamber is evaporated, and a low temperature liquid phase refrigerant ejected from the electronic valve (4) through electronic valves (c, d) remote from a condenser is evaporated until the freezing chamber is-20 ℃; and

3) a 0-5 ℃ refrigeration step in the refrigerating chamber, wherein the vapor phase refrigerant injected from the electronic valve (8) after being recovered from the quick freezing chamber and/or the freezing chamber is evaporated, and the low-temperature liquid phase refrigerant ejected from the electronic valve (e, f) far away from the condenser is evaporated until the refrigerating chamber is 0 ℃.

4. The 3-stage cooling and defrosting system of claim 3, wherein if the temperature of the refrigerant recovered from the quick-freezing chamber in the second freezing step is higher than-20 ℃, the liquid-phase refrigerant is injected and evaporated to freeze the chamber after opening the electronic valve (c) and the manual valve (3), and if the temperature of the refrigerant recovered from the quick-freezing chamber and/or the freezing chamber in the third refrigerating step is higher than 0 ℃, the liquid-phase refrigerant is injected and evaporated to refrigerate the chamber after opening the electronic valve (e) and the manual valve (5).

5. The stage 3 cooling and defrosting system of claim 1 wherein when the normal operation or the defrosting operation is selected through the control panel,

in normal operation, after suspending the circulation pump [5] for defrosting, the cooling system is operated and circulated by closing the check valve (V7), wherein the waste heat energy discharged from the external condenser [2] is received and stored in the waste heat storage tank [4] while the external condenser is heat-exchanged with the brine until the temperature of the brine becomes 30 to 40 ℃,

and in the defrosting operation, after suspending the operation of the cooling system, the defrosting system is started and operated by restarting and operating the circulation pump [5] by opening the check valve (V7), wherein the heated brine of 30 to 40 ℃ stored in the waste heat storage tank [4] is supplied into the brine pipe for removing frost existing on the outer surface of the evaporator [3], and the brine of 4 to 15 ℃ is circulated and recovered to the waste heat storage tank [4 ].

6. The stage 3 cooling and defrost system of claim 5 wherein

If the temperature of the brine in the waste heat storage tank [4] is lower than 40 ℃ in the normal operation, the other path of the three-way valve [6] is opened to directly supply the heat energy from the high-temperature vapor refrigerant to the waste heat storage tank [4] by closing the normal circulation path of the vapor refrigerant,

when the three-way valve [6] is opened for the normal circulation path, if the temperature of the brine in the waste heat storage tank [4] is higher than 40 ℃, the three-way valve [6] is opened for the normal path.

Technical Field

The present invention relates to a 3-stage cooling and energy-saving defrost system using a quick freezing chamber of-40 to-30 ℃, a freezing chamber of-20 to-15 ℃ and a refrigerating chamber of 0 to 5 ℃, in which waste heat energy from a condenser is recovered and stored. More particularly, the present invention relates to a 3-stage cooling system and a defrosting system in which waste heat energy from a condenser is recovered and stored for defrosting, the 3-stage cooling system and the defrosting system including: a cooling device including a compressor for compressing a refrigerant, a condenser for condensing the refrigerant and discharging waste heat, an electronic valve for injecting the refrigerant into the 3-stage cooling chamber; -a quick-freezing chamber of-40 to-30 ℃, in which the refrigerant supplied from the condenser is evaporated and the remaining refrigerant is recovered to the freezing chamber or the refrigerating chamber; a freezing chamber of-20 to-15 ℃, in which a refrigerant supplied from the condenser and/or the quick freezing chamber is evaporated, and the remaining refrigerant is recovered to the refrigerating chamber; and a refrigerating chamber of 0-5 ℃, wherein the refrigerant supplied from the condenser, the instant freezing chamber and/or the freezing chamber is evaporated, and the evaporated refrigerant is discharged to the outside of the refrigerating chamber.

Background

The cooling system comprises a heat exchanger and a circulating refrigerant for cooling the load space. The 3-stage cooling system of the present invention also employs a 4-stage sequentially repeated cooling cycle including compression, condensation, expansion, and evaporation of a refrigerant. Of course, the absorption of the heat of vaporization allows the loading site to be cooled.

The compressor is a device for compressing refrigerant into a high-pressure and high-temperature vapor phase, so that the compressed vapor phase refrigerant is easily condensed in the condenser. Heat energy is exchanged while the refrigerant cycle performs the condensing and evaporating cycles. The compressor is constructed to compress vapor-phase refrigerant by a piston moving in a cylinder. The vapor phase refrigerant from the compressor is condensed into liquid phase refrigerant, and heat energy is discharged to the outside of the condenser. Further, the condensed liquid-phase refrigerant is supplied to the evaporator through the liquid receiver. The liquid receiver has a function of supplying the refrigerant to the evaporator and storing the condensed refrigerant.

In conventional systems, it is difficult to meet the required low evaporation pressure for evaporating the condensed refrigerant at below-30 ℃, because the conventional stage 1 compressor cannot supply the required low evaporation pressure due to its lower condensed refrigerant pressure. Therefore, a 2-stage or 3-stage compressor providing highly compressed vapor phase refrigerant is required to supply the required low evaporation pressure.

If 2-stage compression is explained as an example of multi-stage compression, the low-stage compression makes the refrigerant an intermediate-pressure vapor-phase refrigerant, and the obtained intermediate-pressure vapor-phase refrigerant is injected into the intercooler. The refrigerant is then cooled down to a saturation temperature corresponding to the medium pressure. Finally, the high stage compression causes the refrigerant to become a high pressure and temperature vapor phase refrigerant before passing to the condenser.

Further, the condensed high-pressure and high-temperature refrigerant is expanded and converted into low-pressure and low-temperature refrigerant by passing through the expansion valve. In evaporating the refrigerant, it absorbs the heat of evaporation around the evaporator, which causes the loading space to be cooled and frost to be generated outside the evaporator.

The surface temperature of the evaporator absorbing the external heat energy becomes lower than the ambient air temperature while the ambient air outside the evaporator is relatively humid. Thus, condensed moisture from ambient humid air is converted into frost, which adheres to the surface of the evaporator. Finally, the thickness of the frost increases over time, which leads to inefficient heat exchange around the evaporator and excessive consumption of electrical energy.

On the other hand, in korean patent laid-open publication No.10-2006-5303 "quick-freezing and refrigerated storage apparatus for raspberry (Rubus coreanus)", the inventors of the present invention have disclosed a freezing chamber and a refrigerating chamber for storing raspberry, which are equipped with a unit cooler in a chamber.

In this patent publication, a freezing chamber and a refrigerating chamber for storing raspberries are disclosed, the freezing chamber having a freezing chamber unit cooler inside and the refrigerating chamber having a refrigerating chamber unit cooler inside. More specifically, a raspberry cooling and storage system is disclosed that includes a multi-stage compressor for compressing a refrigerant, an air cooled condenser for condensing the refrigerant, a high pressure liquid receiver, a panel-shaped intercooler for cooling the refrigerant, a freezing chamber, and a refrigerating chamber. In the freezing chamber, the condensed refrigerant is evaporated to-40 to-20 ℃ in the freezing chamber unit cooler, and in the refrigerating chamber, the remaining refrigerant from the freezing chamber is evaporated to-15 to 5 ℃ in the refrigerating chamber unit cooler.

Further, in this patent publication, only a cooling system having a multi-stage compressor and a refrigerant cycle for a freezing chamber of-40 to-20 ℃ and a refrigerating chamber of-15 to 5 ℃ is disclosed. However, there is no disclosure about the 3-stage cooling system of the present invention using a quick freezing chamber of-40 to-30 ℃, a freezing chamber of-20 to-15 ℃ and a refrigerating chamber of 0 to 5 ℃. Naturally, there is no disclosure regarding the supply, circulation and/or recovery of refrigerant to maximize thermal efficiency, e.g., transfer, absorption and/or discharge of thermal energy from the refrigerant.

Accordingly, the inventors of the present invention have attempted to develop a 3-stage cooling and energy-saving defrost system using a quick-freezing chamber of-40 to-30 ℃, a freezing chamber of-20 to-15 ℃, and a refrigerating chamber of 0 to 5 ℃, in which optimal supply, circulation, and/or recovery of refrigerant is employed and waste heat energy from a condenser is recovered and stored for defrosting the quick-freezing chamber, the freezing chamber, and the refrigerating chamber.

Finally, the inventors of the present invention have developed a 3-stage cooling and defrost system in which waste heat energy from a condenser is recovered and stored for defrosting, the 3-stage cooling and defrost system comprising: a cooling device including a multi-stage compressor for compressing a refrigerant, a condenser for discharging waste heat energy, an electronic valve for injecting the refrigerant; -a quick-freezing chamber of-40 to-30 ℃, in which the refrigerant supplied from the condenser is evaporated and the remaining refrigerant is recovered to the freezing chamber or the refrigerating chamber; a freezing chamber of-20 to-15 ℃, in which a refrigerant supplied from the condenser and/or the quick freezing chamber is evaporated, and the remaining refrigerant is recovered to the refrigerating chamber; and a 0-5 ℃ refrigerating chamber, wherein the refrigerant supplied from the condenser, the instant freezing chamber and/or the freezing chamber is evaporated, and the evaporated refrigerant is discharged.

Disclosure of Invention

[ problem to be solved ]

The problem to be solved is to develop a 3-level cooling and energy-saving defrosting system using a quick freezing chamber at the temperature of-40 to-30 ℃, a freezing chamber at the temperature of-20 to-15 ℃ and a refrigerating chamber at the temperature of 0 to 5 ℃. More specifically, this is for the purpose of developing a 3-stage cooling and defrost system in which waste heat energy from a condenser is recovered and stored for defrosting, the 3-stage cooling and defrost system comprising: a cooling device including a multi-stage compressor for compressing a refrigerant, a condenser discharging waste heat energy, an electronic valve for injecting the refrigerant; a quick freezing chamber of-40 to-30 ℃, in which the refrigerant supplied from the condenser is evaporated, and the remaining refrigerant is recovered to the freezing chamber; a freezing chamber of-20 to-15 ℃, in which a refrigerant supplied from the condenser and/or the quick freezing chamber is evaporated, and the remaining refrigerant is recovered to the refrigerating chamber; and a 0-5 ℃ refrigerating chamber, wherein the refrigerant supplied from the condenser, the instant freezing chamber and/or the freezing chamber is evaporated, and the evaporated refrigerant is discharged.

[ means for solving the problems ]

The invention aims to provide a 3-level cooling and energy-saving defrosting system using a quick freezing chamber at-40 to-30 ℃, a freezing chamber at-20 to-15 ℃ and a refrigerating chamber at 0 to 5 ℃, wherein the system comprises the following 3-level cooling steps: 1) a quick-freezing step of-40 to-30 ℃ in the quick-freezing chamber, wherein a liquid-phase refrigerant which is compressed by 2 stages and then is sprayed out from an electronic valve (S3) far away from a condenser is evaporated, and then an ultralow-temperature liquid-phase refrigerant is further evaporated in sequence until the temperature of the quick-freezing chamber is lower than-40 ℃; 2) a freezing step of-20 to-15 ℃ in the freezing chamber, in which the refrigerant injected from the electronic valve (R1) after being recovered from the quick freezing chamber is evaporated after closing the electronic valve (V1), and the liquid-phase refrigerant sprayed from the electronic valve (S2) away from the condenser can be further evaporated until the freezing chamber is-20 ℃; and 3) a 0-5 ℃ refrigeration step in the refrigerating chamber, wherein the refrigerant injected from the electronic valve (R2) after being recovered from the quick freezing chamber and/or the freezing chamber is evaporated after the electronic valve (V2) is closed, and the liquid-phase refrigerant ejected from the electronic valve (S1) far away from the condenser can be further evaporated until the refrigerating chamber is 0 ℃.

Further, the structure of the 3-stage cooling system includes: 1) a multi (2) stage compressor including a low stage compressor for compressing a vapor phase refrigerant to an intermediate pressure, an intercooler for cooling the refrigerant up to a saturation temperature corresponding to the intermediate pressure, and a high stage compressor for compressing the cooled refrigerant to a high pressure and high temperature vapor phase refrigerant; 2) a condenser for condensing the high-pressure and high-temperature vapor-phase refrigerant from the compressor into a liquid-phase refrigerant; 3) a flash evaporator for flash freezing the chamber using a liquid-phase refrigerant from the condenser; 4) a freezing evaporator for freezing the chamber using liquid-phase refrigerant from the condenser and/or vapor-phase refrigerant recovered from the flash chamber; and 5) a refrigeration evaporator for refrigerating the chamber using liquid-phase refrigerant from the condenser and/or vapor-phase refrigerant recovered from the quick-freezing chamber and/or the freezing chamber.

Further, the 3-stage cooling system comprises the following steps: 1) a quick-freezing step of-40 to-30 ℃ in the quick-freezing chamber, wherein the low-temperature liquid-phase refrigerant sprayed out of the expansion valve (1) after 2-stage compression and passing through the electronic valves (a, b) far away from the condenser is evaporated until the temperature of the quick-freezing chamber is-25 ℃, and then the ultra-low-temperature liquid-phase refrigerant sprayed out of the expansion valve (2) in sequence is evaporated until the temperature of the quick-freezing chamber is lower than-40 ℃; 2) a freezing step of-20 to-15 ℃ in a freezing chamber, in which a vapor phase refrigerant injected from an electronic valve (7) after being recovered from a quick freezing chamber is evaporated, and a low temperature liquid phase refrigerant ejected from the electronic valve (4) through electronic valves (c, d) remote from a condenser is evaporated until the freezing chamber is-20 ℃; and 3) a 0-5 ℃ refrigeration step in the refrigerating chamber, wherein the vapor phase refrigerant injected from the electronic valve (8) after being recovered from the quick freezing chamber and/or the freezing chamber is evaporated, and the low-temperature liquid phase refrigerant ejected from the electronic valve (e, f) far away from the condenser is evaporated until the refrigerating chamber is 0 ℃.

Further, if the temperature of the refrigerant recovered from the quick freezing chamber in the second freezing step is higher than-20 ℃, the liquid-phase refrigerant is injected and evaporated to freeze the chamber after opening the electronic valve (c) and the manual valve (3), and if the temperature of the refrigerant recovered from the quick freezing chamber and/or the freezing chamber in the third freezing step is higher than 0 ℃, the liquid-phase refrigerant is injected and evaporated to refrigerate the chamber after opening the electronic valve (e) and the manual valve (5).

Further, when the normal operation or the defrosting operation is selected through the control panel, in the normal operation, after the circulation pump [5] for defrosting is suspended, the cooling system is operated and circulated by closing the check valve (V7), wherein when the external condenser exchanges heat with the brine, the waste heat energy discharged from the external condenser [2] is received and stored in the waste heat storage tank [4] until the temperature of the brine becomes 30 to 40 ℃, and in the defrosting operation, after suspending the operation of the cooling system, the defrost system is started and operated by opening the check valve (V7) to restart and operate the circulation pump [5], wherein the heated brine at 30 to 40 ℃ stored in the waste heat storage tank [4] is supplied to the brine pipe, used for removing frost existing on the outer surface of the evaporator [3] and circulating and recycling the brine with the temperature of 4-15 ℃ to the waste heat storage tank [4 ].

If the brine temperature in the waste heat storage tank [4] is lower than 40 ℃ in normal operation, another path of the three-way valve [6] is opened to directly supply thermal energy from the high-temperature vapor refrigerant to the waste heat storage tank [4] by closing the normal circulation path of the vapor-phase refrigerant, and when the three-way valve [6] is opened for the normal circulation path, the three-way valve [6] is opened for the normal path if the brine temperature in the waste heat storage tank [4] is higher than 40 ℃.

[ advantageous effects ]

The invention has the beneficial effect of providing a 3-level cooling and energy-saving defrosting system which uses a quick-freezing chamber at the temperature of-40 to-30 ℃, a freezing chamber at the temperature of-20 to-15 ℃ and a refrigerating chamber at the temperature of 0 to 5 ℃.

Further, the present invention provides a 3-stage cooling and defrosting system in which waste heat energy from a condenser is recovered and stored for defrosting, the 3-stage cooling and defrosting system comprising: a cooling device including a multi-stage compressor for compressing a refrigerant, a condenser discharging waste heat energy, an electronic valve for injecting the refrigerant; a quick freezing chamber of-40 to-30 ℃, in which the refrigerant supplied from the condenser is evaporated, and the remaining refrigerant is recovered to the freezing chamber; a freezing chamber of-20 to-15 ℃, in which a refrigerant supplied from the condenser and/or the quick freezing chamber is evaporated, and the remaining refrigerant is recovered to the refrigerating chamber; and a 0-5 ℃ refrigerating chamber, wherein the refrigerant supplied from the condenser, the instant freezing chamber and/or the freezing chamber is evaporated, and the evaporated refrigerant is discharged.

Drawings

FIG. 1 is a schematic diagram of the overall construction of a 3-stage cooling and defrosting system of the present invention comprising a quick freezing chamber of-40 to-30 ℃, a freezing chamber of-20 to-15 ℃ and a refrigerating chamber of 0 to 5 ℃, wherein waste heat energy from a condenser is used to defrost the quick freezing chamber, the freezing chamber and the refrigerating chamber.

Fig. 2 is a schematic view of a multi-stage compression 3-stage cooling system including a quick-freezing chamber, a freezing chamber and a refrigerating chamber for explaining the present invention.

As shown in fig. 2, the multi (2) stage compressor of the present invention includes a low stage compressor for compressing vapor phase refrigerant into medium pressure, an intercooler for cooling refrigerant up to a saturation temperature corresponding to the medium pressure, and a high stage compressor for compressing the cooled refrigerant into vapor phase refrigerant of high pressure and high temperature.

Fig. 3 is a schematic diagram for explaining supply, circulation and recovery of refrigerant in the 3-stage cooling system including the instant freezing chamber, the freezing chamber and the refrigerating chamber of the present invention.

As shown in fig. 3, the 3-stage cooling system of the present invention starts from a first quick freezing step for a quick freezing chamber of-40 to-30 ℃, in which a low-temperature liquid-phase refrigerant injected from an expansion valve (1) after being compressed in 2 stages through electronic valves (a, b) distant from a condenser is expanded and evaporated until the quick freezing chamber is-25 ℃, and then the ultra-low-temperature liquid-phase refrigerant sequentially injected from the expansion valve (2) is expanded and evaporated until the quick freezing chamber is lower than-40 ℃.

Followed by a second freezing step for a freezing chamber of-20 to-15 ℃. The vapor phase refrigerant injected from the electronic valve (7) after being recovered from the instant freezing chamber is evaporated. If the vapor phase refrigerant recovered is insufficient for the freezing chamber, the low temperature liquid phase refrigerant supplied from the electronic valve (4) through the electronic valves (c, d) remote from the condenser is expanded and evaporated until the freezing chamber is-20 ℃.

And finally, a third refrigeration step aiming at the 0-5 ℃ refrigerating chamber. The vapor phase refrigerant injected from the electronic valve (8) after being recovered from the quick freezing chamber and/or the freezing chamber is evaporated. If the vapor phase refrigerant recovered is insufficient for the refrigerating chamber, the low temperature liquid phase refrigerant supplied from the electronic valve (6) through the electronic valves (e, f) remote from the condenser is expanded and evaporated until the refrigerating chamber is 0 ℃.

Fig. 4 is a schematic diagram for explaining supply, circulation and recovery of refrigerants of the quick-freezing chamber unit cooler (evaporator), the freezing chamber unit cooler (evaporator) and the refrigerating chamber unit cooler (evaporator) of the present invention.

The low-temperature liquid-phase refrigerant is supplied to the quick-freezing chamber unit cooler, the freezing chamber unit cooler, and the refrigerating chamber unit cooler in this order through the main pipe. The vapor refrigerant recovered from the quick-freezing chamber unit cooler is supplied to the freezing chamber unit cooler after the electronic valve (V1) is closed, and the vapor refrigerant recovered from the freezing chamber unit cooler is supplied to the refrigerating chamber unit cooler after the electronic valve (V2) is closed. For convenience, an electronic valve or a manual valve may be used.

Fig. 5a illustrates the normal operation of the 3-stage cooling and defrost system of the present invention including the quick-freeze, freezer and refrigerator compartments.

In normal operation, after the circulation pump [5] for defrosting is suspended, the cooling system is operated and circulated by closing the check valve (V7). Then, when the external condenser exchanges heat with the brine, the waste heat energy discharged from the external condenser [2] is received and stored in the waste heat storage tank [4] until the temperature of the brine becomes 30-40 ℃.

Fig. 5b illustrates a defrosting operation of the 3-stage cooling and defrosting system of the present invention including a quick freezing chamber, a freezing chamber, and a refrigerating chamber. The waste heat energy from the condenser is used to defrost the quick freezing, freezing and refrigerating compartments.

In the defrosting operation, after suspending the operation of the cooling system, the defrosting system is started and operated by restarting and operating the circulation pump [5] by opening the check valve (V7). The heated brine of 30-40 ℃ stored in the waste heat storage tank [4] is supplied to a brine pipe for removing frost existing on the outer surface of the evaporator [3] and circulating and recovering the brine to the waste heat storage tank [4 ].

Detailed Description

The invention relates to a 3-level cooling and energy-saving defrosting system using a quick freezing chamber at-40 to-30 ℃, a freezing chamber at-20 to-15 ℃ and a refrigerating chamber at 0 to 5 ℃, which comprises the following 3-level cooling steps: 1) a quick-freezing step of-40 to-30 ℃ in the quick-freezing chamber, wherein a liquid-phase refrigerant which is compressed by 2 stages and then is sprayed out from an electronic valve (S3) far away from a condenser is evaporated, and then an ultralow-temperature liquid-phase refrigerant is further evaporated in sequence until the temperature of the quick-freezing chamber is lower than-40 ℃; 2) a freezing step of-20 to-15 ℃ in the freezing chamber, in which the refrigerant injected from the electronic valve (R1) after being recovered from the quick freezing chamber is evaporated after closing the electronic valve (V1), and the liquid-phase refrigerant sprayed from the electronic valve (S2) away from the condenser can be further evaporated until the freezing chamber is-20 ℃; and 3) a 0-5 ℃ refrigeration step in the refrigerating chamber, wherein the refrigerant injected from the electronic valve (R2) after being recovered from the quick freezing chamber and/or the freezing chamber is evaporated after the electronic valve (V2) is closed, and the liquid-phase refrigerant ejected from the electronic valve (S1) far away from the condenser can be further evaporated until the refrigerating chamber is 0 ℃.

Further, the normal operation and the defrosting operation are selected through the control panel. In normal operation, after suspending the circulation pump [5] for defrosting, the cooling system is operated and circulated by closing the check valve (V7), wherein waste heat energy discharged from the external condenser [2] is received and stored in the waste heat storage tank [4] until the brine temperature becomes 30-40 ℃ while the external condenser is heat-exchanged with brine. Further, in the defrosting operation, after suspending the operation of the cooling system, the defrosting system is started and operated by restarting and operating the circulation pump [5] by opening the check valve (V7), wherein the heated brine of 30 to 40 ℃ stored in the waste heat storage tank [4] is supplied into the brine pipe for removing frost existing on the outer surface of the evaporator [3], and the brine of 4 to 15 ℃ is circulated and recovered to the waste heat storage tank [4 ].

The present invention can be more specifically explained with reference to the drawings.

FIG. 1 is a schematic diagram of the overall construction of a 3-stage cooling and defrosting system of the present invention comprising a quick freezing chamber of-40 to-30 ℃, a freezing chamber of-20 to-15 ℃ and a refrigerating chamber of 0 to 5 ℃, wherein waste heat energy from a condenser is used to defrost the quick freezing chamber, the freezing chamber and the refrigerating chamber.

The cooling system for cooling the instant freezer, freezer and refrigerator compartments of the present invention can be explained as follows. The vapor phase refrigerant compressed by the compressor can be easily condensed in the condenser. In condensing the compressed vapor phase refrigerant, waste heat is discharged to the outside of the condenser, which is transferred and stored in a waste heat storage tank. Further, the high-temperature condensed refrigerant is transferred and sequentially supplied to the quick-freezing cooler, the freezing cooler, and the refrigerating cooler, wherein the refrigerant is evaporated as absorbing the thermal energy enclosed in the quick-freezing chamber, the freezing chamber, and the refrigerating chamber. Finally, vapor phase refrigerant from the evaporator is recycled to the compressor and the cooling cycle will be repeated.

On the other hand, the defrosting system for defrosting the quick-freeze cooler, the freezer cooler, and the refrigerator cooler of the present invention can be explained as follows. Upon receiving the waste heat energy discharged from the condenser, the brine is heated and stored in the waste heat storage tank. Further, the heated brine is sequentially supplied to the defrosters for the quick-freezing cooler, the freezing cooler, and the refrigerating cooler. After defrosting, the brine is recycled to the waste heat storage tank.

Fig. 2 is a schematic view of a multi-stage compression 3-stage cooling system including a quick-freezing chamber, a freezing chamber and a refrigerating chamber for explaining the present invention.

As shown in fig. 2, the multi (2) stage compressor of the present invention includes a low stage compressor for compressing vapor phase refrigerant into medium pressure, an intercooler for cooling refrigerant up to a saturation temperature corresponding to the medium pressure, and a high stage compressor for compressing the cooled refrigerant into vapor phase refrigerant of high pressure and high temperature.

Further, the structure of the 3-stage cooling system can be explained as follows. The multi (2) stage compressor includes a low-stage compressor for compressing a vapor-phase refrigerant to an intermediate pressure, an intercooler for cooling the refrigerant up to a saturation temperature corresponding to the intermediate pressure, and a high-stage compressor for compressing the cooled refrigerant to a vapor-phase refrigerant of high pressure and high temperature. The condenser condenses the high-pressure and high-temperature vapor-phase refrigerant from the compressor into a liquid-phase refrigerant. The flash-freeze evaporator uses liquid-phase refrigerant from a condenser to flash-freeze the chamber. The freeze evaporator uses liquid phase refrigerant from the condenser and/or vapor phase refrigerant recovered from the flash chamber to freeze the chamber. Finally, the refrigeration evaporator uses liquid phase refrigerant from the condenser and/or vapor phase refrigerant recovered from the flash and/or freezer compartments to refrigerate the chamber.

Fig. 3 is a schematic diagram for explaining supply, circulation and recovery of refrigerant in the 3-stage cooling system including the instant freezing chamber, the freezing chamber and the refrigerating chamber of the present invention.

As shown in fig. 3, the 3-stage cooling system of the present invention starts from a first quick freezing step for a quick freezing chamber of-40 to-30 ℃, in which a low-temperature liquid-phase refrigerant injected from an expansion valve (1) after being compressed in 2 stages through electronic valves (a, b) distant from a condenser is expanded and evaporated until the quick freezing chamber is-25 ℃, and then the ultra-low-temperature liquid-phase refrigerant sequentially injected from the expansion valve (2) is expanded and evaporated until the quick freezing chamber is lower than-40 ℃.

Followed by a second freezing step for a freezing chamber of-20 to-15 ℃. The vapor phase refrigerant injected from the electronic valve (7) after being recovered from the instant freezing chamber is evaporated. If the vapor phase refrigerant recovered is insufficient for the freezing chamber, the low temperature liquid phase refrigerant supplied from the electronic valve (4) through the electronic valves (c, d) remote from the condenser is expanded and evaporated until the freezing chamber is-20 ℃.

And finally, a third refrigeration step aiming at the 0-5 ℃ refrigerating chamber. The vapor phase refrigerant injected from the electronic valve (8) after being recovered from the quick freezing chamber and/or the freezing chamber is evaporated. If the vapor phase refrigerant recovered is insufficient for the refrigerating chamber, the low temperature liquid phase refrigerant supplied from the electronic valve (6) through the electronic valves (e, f) remote from the condenser is expanded and evaporated until the refrigerating chamber is 0 ℃.

On the other hand, if the temperature of the refrigerant recovered from the instant freezing chamber in the second freezing step is higher than-20 ℃, the liquid-phase refrigerant is sprayed and evaporated to freeze the chamber after opening the electronic valve (c) and the manual valve (3).

Further, if the temperature of the refrigerant recovered from the quick-freezing chamber and/or the freezing chamber in the third cooling step is higher than 0 ℃, after the electronic valve (e) and the manual valve (5) are opened, the liquid-phase refrigerant is sprayed and evaporated to cool the chamber.

Fig. 4 is a schematic diagram for explaining supply, circulation and recovery of refrigerants of the quick-freezing chamber unit cooler (evaporator), the freezing chamber unit cooler (evaporator) and the refrigerating chamber unit cooler (evaporator) of the present invention.

As shown in fig. 4, the low-temperature liquid-phase refrigerant is sequentially supplied to the quick-freezing chamber unit cooler, the freezing chamber unit cooler, and the refrigerating chamber unit cooler through the main pipe. The vapor refrigerant recovered from the quick-freezing chamber unit cooler is supplied to the freezing chamber unit cooler after the electronic valve (V1) is closed, and the vapor refrigerant recovered from the freezing chamber unit cooler is supplied to the refrigerating chamber unit cooler after the electronic valve (V2) is closed. For convenience, an electronic valve or a manual valve may be used.

Fig. 5a illustrates the normal operation of the 3-stage cooling and defrost system of the present invention including the quick-freeze, freezer and refrigerator compartments.

In normal operation, after the circulation pump [5] for defrosting is suspended, the cooling system is operated and circulated by closing the check valve (V7). Then, when the external condenser exchanges heat with the brine, the waste heat energy discharged from the external condenser [2] is received and stored in the waste heat storage tank [4] until the temperature of the brine becomes 30-40 ℃.

If the temperature of the brine in the waste heat storage tank [4] is lower than 40 ℃ in the normal operation, the other path of the three-way valve [6] is opened to directly supply the heat energy from the high-temperature vapor refrigerant to the waste heat storage tank [4] by closing the normal circulation path of the vapor-phase refrigerant. On the other hand, if the temperature of the brine in the waste heat storage tank [4] is higher than 40 ℃, the three-way valve [6] is opened for a normal circulation path.

Fig. 5b illustrates a defrosting operation of the 3-stage cooling and defrosting system of the present invention including a quick freezing chamber, a freezing chamber, and a refrigerating chamber. The waste heat energy from the condenser is used to defrost the quick freezing, freezing and refrigerating compartments.

In the defrosting operation, after suspending the operation of the cooling system, the defrosting system is started and operated by restarting and operating the circulation pump [5] by opening the check valve (V7). The heated brine of 30-40 ℃ stored in the waste heat storage tank [4] is supplied to a brine pipe for removing frost existing on the outer surface of the evaporator [3] and circulating and recovering the brine to the waste heat storage tank [4 ].

List of reference numerals

a, b: electronic valve for supplying liquid refrigerant to a flash chamber

c, d: electronic valve for supplying liquid refrigerant to freezing chamber

e, f: electronic valve for supplying refrigerant to refrigerating chamber

1: an expansion valve in the quick freezing chamber for cooling to-25 deg.C

2: an expansion valve in the quick freezing chamber for cooling to-40 deg.C

3: manual valve for injecting refrigerant into freezing chamber

4: expansion valve for freezing chamber

5: manual valve for spraying refrigerant to refrigerating chamber

6: expansion valve for refrigerating chamber

7: electronic valve for supplying vapor refrigerant to freezing chamber

8: electronic valve for supplying vapor refrigerant to refrigerating chamber

9,10,11,12: blocking electronic valve

S1: electronic valve for supplying refrigerant to refrigerating chamber

S2: electronic valve for supplying liquid refrigerant to freezing chamber

S3: electronic valve for supplying liquid refrigerant to a flash chamber

S8: condenser external temperature sensor

S9: temperature sensor for stored saline

S10: temperature sensor of waste heat exchanger

S11: cooler temperature sensor

S12: frost detection sensing sensor

S13: supplied saline temperature sensor

V1: electronic valve for vapor refrigerant recovery

V2: electronic valve for vapor refrigerant recovery

V7: check valve

R1: electronic valve for supplying vapor refrigerant to freezing chamber

R2: electronic valve for supplying vapor refrigerant to refrigerating chamber