KR20150102420A - Apparatus for refrigerator and freezer - Google Patents

Abstract

The present invention relates to a refrigerating and freezing device capable of reducing electricity consumption to increase energy efficiency by adjusting an operational speed (Hz) and a driving force (HP) of a compressor based on pressures detected by a compressor inlet pressure sensor and a prestored matching table. A refrigerating and freezing device comprises: a compressor to compress a gaseous refrigerant at high temperatures and high pressures; a condenser having a cooling fan to condense the high-temperature and high-pressure gaseous refrigerant compressed by the compressor to a high-temperature and a high-pressure liquid refrigerant; a liquid receiver to temporarily store the high-temperature and the high-pressure liquid refrigerant condensed by the condenser; an expansion valve to rapidly expand the high-temperature and the high-pressure liquid refrigerant received from the liquid receiver to a fog state; and an evaporator to evaporate the fog-state refrigerant rapidly expanded by the expansion valve through a heat exchange action of absorbing heat from a refrigerator and a freezer. According to the present invention, the refrigerating and freezing device comprises: a compressor inlet pressure sensor arranged on an inlet line of the compressor to detect the pressures; and a control part to control the operation speed (Hz) and the driving force (HP) of the compressor based on the pressures detected by the compressor inlet pressure sensor and a prestored matching table.

Description

[0001] APPARATUS FOR REFRIGERATOR AND FREEZER [0002]

The present invention relates to a refrigerating and freezing apparatus, and more particularly, to a refrigerating and freezing apparatus, and more particularly, to a refrigerating and freezing apparatus, Thereby increasing the energy efficiency of the refrigerator.

Generally, an air-cooled condenser performs a condensing process by using a high-temperature / high-pressure refrigerant compressed by a compressor and air blown by a plurality of cooling fans, and then performs repetitive operations through a refrigerant circulation path, And air conditioning is performed.

FIG. 1 is a schematic diagram showing a cooling apparatus in which a conventional air cooling type condenser is installed. As shown in FIG. 1, the wiring configuration of the cooling apparatus shown in FIG. 1 is a configuration in which a low- A condenser 20 for heat-exchanging the high-temperature / high-pressure refrigerant with the air blown in accordance with the driving of the cooling fan provided at one side, forcibly cooling the refrigerant to liquefy the refrigerant, and a condenser 20 A filter 40 for removing impurities contained in the refrigerant that has passed through the receiver 30 and a filter 40 for removing impurities contained in the refrigerant passed through the receiver 30, An expansion valve 60 for expanding the refrigerant of high pressure coming from the filter 40 to a predetermined evaporation pressure, and an expansion valve 60 for expanding the refrigerant passing through the expansion valve 60 Then, (Not shown) to cool the room air, and then to supply the low-temperature / low-pressure gas refrigerant to the compressor 10, (60).

The LP, HP, and OP shown in the drawing represent low pressure, high pressure, and fluid systems, respectively. OPS represents a hydraulic pressure protection switch, HPS represents a high pressure switch, and HLPS represents a high / low pressure switch.

The cooling process by the air-cooled condenser according to the related art will now be described.

Here, only the cooling process by the air-cooled condenser is described, but the operation and operation of the air-cooled condenser used for the refrigeration, the refrigeration, and the air conditioning operation are similar to each other.

First, when refrigerant compressed into a gaseous state at a high temperature / high pressure by the compressor 10 flows into the condenser 20 through the refrigerant tube, the condenser 20 compresses the gas refrigerant compressed at a high temperature / Exchanges heat with air blown by the refrigerant, and the refrigerant is forcedly cooled to be liquefied.

Then, the high-pressure refrigerant liquefied in the condenser 20 passes through the receiver 30 and the filter 40 to check the refrigerant state and remove impurities contained in the refrigerant.

The high-pressure refrigerant having the impurities removed through the above process is supplied to the evaporator 70. At this time, the refrigerant passes through the expansion valve 60 which expands to the evaporation pressure of the refrigerant, and coexists with the low- And then flows into the evaporator 70 in this state.

Thereafter, the refrigerant introduced into the evaporator 70 takes heat from the air blown by the indoor fan by the evaporation action of the evaporator 70 to cool the room air, discharges the cooled air to the room, And the low temperature / low pressure gas refrigerant converted in the evaporator 70 is again sucked into the compressor 10, and the above process is repeated.

However, in the air-cooled condenser according to the related art, when the high-temperature / high-pressure gas refrigerant compressed in the compressor is subjected to a heat exchange process only by the air blown by the cooling fan during liquefaction, the refrigerant is applied It is necessary that the cooling fan for heat exchange has a larger capacity and size in proportion to the space. Therefore, a space for installing the cooling fan is required, and accordingly, a loss of the power ratio is increased And the maintenance cost is increased.

In addition, when the air-cooled condenser is used to perform refrigeration, refrigeration, and air conditioning, the temperature of the liquefied refrigerant discharged from the air-cooled condenser is discharged at a temperature higher than the required temperature, thereby lowering the cooling efficiency.

Registered Utility Model Registration No. 20-0179846 (Feb. 14, 2000)

It is an object of the present invention to solve the above problems in the related art by controlling the operation speed (Hz) and the driving force (HP) of the compressor based on the pressure sensed by the compressor inflow pressure sensor and the previously stored matching table, To thereby improve the energy efficiency of the refrigerating and freezing apparatus.

According to an aspect of the present invention, there is provided a refrigerating and freezing apparatus comprising: a compressor for compressing gas refrigerant at a high temperature and a high pressure; a condenser for condensing the gas refrigerant compressed at high temperature and high pressure into liquid refrigerant at high temperature and high pressure, And a condenser for condensing the liquid refrigerant at a high temperature and high pressure temporarily stored in the condenser, an expansion valve for rapidly expanding the high-temperature and high-pressure liquid refrigerant supplied from the receiver into a misty state, And an evaporator for evaporating heat from the refrigerating freezer by heat exchange action, the compressor comprising: a compressor inflow pressure sensor provided at an inlet line of the compressor for sensing a pressure; And a controller for adjusting the operation speed (Hz) and the driving force (HP) of the compressor based on the pressure sensed by the compressor inflow pressure sensor and the stored matching table.

Preferably, the compressor further comprises a compressor outlet pressure sensor provided at an outlet line of the compressor to sense pressure, wherein the controller senses a pressure sensed by the compressor outlet pressure sensor at an initial startup of the refrigerating and / Wherein the control means controls the cooling fan of the condenser to rotate at a normal speed when the cooling fan is at a driving pressure value or more and controls the compressor such that the pressure sensed by the compressor outlet pressure sensor during normal operation after the cooling fan of the condenser is rotated is equal to or less than a predetermined stop pressure The cooling fan of the condenser is stopped, and the driving pressure value may be set to be higher than the stopping pressure value.

Preferably, the drive pressure value is 180 psi, and the stop pressure value is 150 psi.

Preferably, when the outside air temperature sensed by the outside air temperature sensor is higher than a predetermined reference temperature, the cooling fan of the condenser is operated at a speed higher than the normal speed So that it can be controlled to be driven to rotate at a speed.

Preferably, the reference temperature may be 25 < 0 > C.

Preferably, the refrigerating freezer is composed of a plurality of refrigerators, an expansion valve and an evaporator are individually connected to the refrigerating freezers, the refrigerant of the receiver is branched and supplied through an expansion valve and an evaporator individually connected to the freezing freezers, And a plurality of evaporator outlet temperature sensors provided on an outlet line of the evaporator connected to the respective refrigerating freezers to sense the temperature of the refrigerant, wherein the controller includes a solenoid valve on each branched path, When the temperature sensed by the evaporator outlet temperature sensor is lower than the set temperature, the solenoid valve connected to the refrigerating freezer is shut off to prevent overcooling.

Preferably, the compressor further comprises a compressor outlet temperature sensor provided at an outlet line of the compressor for sensing the temperature of the refrigerant, wherein when the temperature sensed by the compressor outlet temperature sensor is equal to or higher than a predetermined value, It is possible to prevent the compressor from overheating.

The present invention as described above can improve the energy efficiency by reducing the electric consumption amount by adjusting the operation speed (Hz) and the driving force (HP) of the compressor based on the pressure sensed by the compressor inflow pressure sensor and the previously stored matching table There is an advantage.

In addition, there is an advantage in that the energy efficiency can be further increased by controlling the speed of the cooling fan by using the compressor outlet pressure sensor.

In addition, it is advantageous in that the refrigerating and freezing efficiency can be prevented from being lowered in a high temperature condition such as a summer heat sensation by using an outside air temperature sensor.

In addition, since the solenoid valve is controlled according to the set temperature of each refrigerating freezer, the refrigerating and cooling efficiency can be increased and energy efficiency can be further increased.

Further, when the temperature of the compressor is increased by using the compressor outlet temperature sensor, there is an advantage that the compressor can be prevented from overheating by driving the cooling unit.

1 is a schematic diagram showing a cooling apparatus in which an air-cooled condenser according to a related art is installed.
FIG. 2 is a schematic view showing a refrigerator-freezing apparatus according to an embodiment of the present invention.
FIG. 3 is a connection diagram of a control unit constituting a refrigerating and freezing apparatus according to an embodiment of the present invention.

The present invention may be embodied in many other forms without departing from its spirit or essential characteristics. Accordingly, the embodiments of the present invention are to be considered in all respects as merely illustrative and not restrictive.

The terms first, second, etc. 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.

And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", "having", and the like are intended to specify the presence of stated features, integers, steps, operations, components, Steps, operations, elements, components, or combinations of elements, numbers, steps, operations, components, parts, or combinations thereof.

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 to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and a duplicate description thereof will be omitted.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 and 3, the refrigerating freezer 10a, 10b, 10c according to the embodiment of the present invention includes a compressor 100, a condenser 200, a receiver 300, an expansion valve EEV1 , EEV2, and EEV3), evaporators (400a, 400b, 400c), and a controller (500).

The compressor 100 functions to compress the gas refrigerant to high temperature and high pressure.

The inlet pipe line of the compressor 100 is provided with a compressor inflow pressure sensor P1 for sensing the pressure at the inlet side.

A compressor outlet pressure sensor P2 for sensing the pressure at the outlet side is provided in the piping line at the outlet side of the compressor 100. [

A compressor outlet temperature sensor S2 for sensing the temperature of the refrigerant is installed in the piping line on the outlet side of the compressor 100.

The condenser 200 functions to condense the high-temperature and high-pressure gas refrigerant compressed in the compressor 100 into high-temperature and high-pressure liquid refrigerant, and a cooling fan for the condensation is provided.

An ambient temperature sensor S1 for sensing the temperature of the outside air is provided around the inlet pipe line of the condenser 200.

The receiver (300) temporarily stores the high-temperature, high-pressure liquid refrigerant condensed in the condenser (200).

The expansion valves EEV1, EEV2, and EEV3 perform a function of rapidly expanding the high-temperature and high-pressure liquid refrigerant supplied from the receiver (300) into a mist state.

The evaporators 400a, 400b and 400c function to evaporate the refrigerant in the fog state rapidly expanded in the expansion valves EEV1, EEV2 and EEV3 by the heat exchange action of taking the heat of the freezing refrigerators 10a, 10b and 10c .

That is, the evaporators 400a, 400b, and 400c are provided on one side of the refrigerating freezers 10a, 10b, and 10c to lower the internal temperatures of the refrigerating freezers 10a, 10b, and 10c to a predetermined temperature (for example, Image 5 ° C).

Hereinafter, a concrete connection structure of the compressor 100, the condenser 200, the receiver 300, the expansion valves EEV1, EEV2, and EEV3, and the evaporators 400a, 400b, and 400c will be described with reference to FIG. .

The outlet of the compressor 100 and the inlet of the condenser 200 are connected through a first pipe 600a and the refrigerant discharged from the compressor 100 flows through the first pipe 600a to the condenser 200 to the inlet side.

The outlet of the condenser 200 and the inlet of the receiver 300 are connected through a second pipe 600b and the refrigerant discharged from the condenser 200 flows through the second pipe 600b, Is supplied to the inlet side of the vessel (300).

The receiver 300 and the plurality of evaporators 400a, 400b and 400c are connected through a third piping 600c and a plurality of fourth piping 600d branched from the third piping 600c, The refrigerant discharged from the receiver 300 is supplied to the third piping 600c and then branched to the plurality of fourth piping 600d and supplied to the respective evaporators 400a, 400b and 400c.

That is, the refrigerating freezers 10a, 10b and 10c are constituted in plural, and the refrigerators 10a, 10b and 10c are provided with respective evaporators 400a, 400b and 400c, and the evaporators 400a, 400b, 400c are connected to the receiver 300 through the fourth piping 600d and the third piping 600c.

Each fourth piping 600d is provided with expansion valves EEV1, EEV2 and EEV3 and solenoid valves S.V1, S.V2 and S.V3 and connected to the refrigerating freezers 10a, 10b and 10c The outlet lines of the evaporators 400a, 400b and 400c are respectively provided with evaporator outlet temperature sensors S3, S4 and S5 for sensing the temperature of the refrigerant.

The plurality of evaporators 400a, 400b and 400c and the compressor 100 are connected through a sixth pipe 600f which integrally connects the fifth pipe 600e and the fifth pipe 600e, The refrigerant discharged from the plurality of evaporators 400a, 400b and 400c is supplied to the plurality of fifth pipes 600e and then supplied to the compressor 100 through the sixth pipe 600f.

The compressor 100, the condenser 200, the receiver 300, the expansion valves EEV1, EEV2, and EEV3, and the evaporator (not shown) through the first pipe 600a to the sixth pipe 600f, 400a, 400b, and 400c.

Hereinafter, the controller 500 for controlling the operation of the compressor 100, the condenser 200, the receiver 300, the expansion valves EEV1, EEV2, and EEV3, and the evaporators 400a, 400b, Will be described.

The control unit 500 controls the operation speed (Hz) and the driving force (HP) of the compressor 100 based on the pressure sensed by the compressor inflow pressure sensor P1 and the previously stored matching table.

For example, as shown in Table 1 below, a compressor inflow pressure sensor (not shown) installed in the sixth pipe 600f, which is the inlet piping line of the compressor 100, detects a pressure of the refrigerant flowing into the compressor 100 The controller 100 controls the operation speed of the compressor 100 to be 'a1' and the driving force to be 'a2' when the pressure detected by the compressor inflow pressure sensor P1 is 'A' The controller 100 controls the operation speed of the compressor 100 to be 'b1' and the driving force to be b2. When the pressure detected by the compressor inflow pressure sensor P1 is 'C', the operation speed of the compressor 100 Quot; c1 " and the driving force is " c2 ".

Compressor inlet pressure sensor (P1) Pressure Operation speed (Hz) Driving force (HP) A a1 a2 B b1 b2 C c1 c2

If the pressure sensed by the compressor inflow pressure sensor P1 is high, the control unit 500 determines that the operation speed (Hz) and the operation speed (Hz) are high, The driving force HP is controlled to be higher and the driving speed and the driving force HP are controlled to be lowered when the pressure detected by the compressor inflow pressure sensor P1 is low. do.

When the pressure sensed by the compressor outlet pressure sensor P2 is equal to or higher than a predetermined driving pressure value (for example, 180 psi) at the time of initial startup of the refrigerating freezers 10a, 10b, 10c, The control unit controls the cooling fan of the condenser 200 to rotate at a normal speed and controls the pressure detected by the compressor outlet pressure sensor P2 to be a predetermined stop during normal operation after the cooling fan of the condenser 200 is rotationally driven. And controls the cooling fan of the condenser 200 to stop when the pressure is 150 psi or less.

That is, as the cooling fan of the condenser 200 is driven to rotate or stopped according to the pressure of the outlet of the compressor 100, the energy consumption for driving the cooling fan can be reduced to further increase the energy efficiency.

If the outside air temperature sensed by the outside air temperature sensor S1 is equal to or higher than a predetermined reference temperature (for example, 25 ° C), the controller 500 controls the cooling fan of the condenser 200 to be faster than the normal speed Speed control is performed by using the driving pressure value and the stop pressure value rather than controlling the cooling fan.

This is because, when controlling the operation of the cooling fan by using the driving pressure value and the stopping pressure value, the cooling efficiency may be lowered during a hot period such as during the summer. When the outside air temperature is higher than the predetermined reference temperature, The fan is rotated at a speed higher than the normal speed to maximize the cooling efficiency.

Meanwhile, when the temperature sensed by the evaporator outlet temperature sensors S3, S4, S5 is lower than the set temperature (for example, 5 deg. C) of the refrigerating freezers 10a, 10b, 10c The solenoid valves S.V1, S.V2, and S.V3 connected to the refrigerating freezers 10a, 10b, and 10c are shut off to prevent overcooling.

That is to say that the temperature sensed by the evaporator outlet temperature sensors S3, S4 and S5 is lower than 5 占 폚 in the state where the set temperatures of the plurality of freezing refrigerators 10a, 10b and 10c are set at 5 占 폚, The refrigerant supplied to the evaporators 400a, 400b, and 400c of the refrigerating freezers 10a, 10b, and 10c is shut off to prevent overcooling, Thereby increasing the cooling efficiency of the other freezing freezers 10a, 10b, 10c, thereby reducing energy consumption and increasing energy efficiency.

For example, when the temperature sensed by the first evaporator outlet temperature sensor S3 is 4 占 폚 while the set temperature of the first freezer freezer 10a is set to 5 占 폚, the first refrigerator freezer 10a is connected to the first freezer freezer 10a The solenoid valve VS1 is shut off to shut off the refrigerant supplied to the first freezer compartment 10a so that the refrigerant is supplied only to the second and third freezer compartments 10b and 10c.

The control unit 500 drives a cooling unit (not shown) that cools the compressor 100 when the temperature sensed by the compressor outlet temperature sensor S2 is equal to or greater than a predetermined value, Prevent overheating.

For example, when the temperature sensed by the compressor outlet temperature sensor S2 is 120 ° C or higher, the oil contained in the compressor 100 is carbonized to drive the compressor 100, And prevent overheating of the compressor 100 to prevent the compressor 100 from being damaged.

Although the present invention has been described with reference to the preferred embodiments thereof with reference to the accompanying drawings, it will be apparent to those skilled in the art that many other obvious modifications can be made therein without departing from the scope of the invention. Accordingly, the scope of the present invention should be interpreted by the appended claims to cover many such variations.

100: Compressor
200: condenser
300: Receiver
400a, 400b, 400c:
500:
EEV1, EEV2, EEV3: Expansion valve

Claims (7)

A condenser provided with a cooling fan for condensing high-temperature and high-pressure gaseous refrigerant compressed in the compressor to a high-temperature and high-pressure liquid-phase refrigerant, and a high-temperature and high-pressure liquid-phase refrigerant condensed in the condenser, An expansion valve for rapidly expanding the liquid refrigerant at a high temperature and high pressure supplied from the receiver to a mist state and an evaporator for evaporating the refrigerant in a misty state rapidly expanded by the expansion valve by a heat exchange action that takes heat of the freezing freezer In the refrigeration freezer apparatus,
A compressor inflow pressure sensor provided at an inlet line of the compressor for sensing pressure; And
And a controller for controlling the operation speed (Hz) and the driving force (HP) of the compressor based on the pressure sensed by the compressor inlet pressure sensor and the pre-stored matching table. The method according to claim 1,
And a compressor outlet pressure sensor provided at an outlet line of the compressor for sensing pressure,
Wherein,
The controller controls the cooling fan of the condenser to be rotated at a normal speed when the pressure detected by the compressor outlet pressure sensor is equal to or higher than a predetermined driving pressure value at the initial startup of the refrigerating and freezing apparatus, Wherein the controller controls the cooling fan of the condenser to stop when the pressure sensed by the compressor outlet pressure sensor is lower than a predetermined stop pressure value during normal operation and the drive pressure value is set to be higher than the stop pressure value Refrigeration and freezers. 3. The method of claim 2,
Wherein the drive pressure value is 180 psi and the stop pressure value is 150 psi. 3. The method of claim 2,
And an outside air temperature sensor for sensing the outside air temperature,
Wherein,
Wherein the controller controls the cooling fan of the condenser to be driven to rotate at a speed higher than the normal speed when the outside air temperature detected by the outside air temperature sensor is equal to or higher than a predetermined reference temperature. 5. The method of claim 4,
Wherein the reference temperature is 25 占 폚. The method according to claim 1,
Wherein the refrigerating freezer is composed of a plurality of refrigerators, an expansion valve and an evaporator are individually connected to the refrigerating freezers, the refrigerant of the receiver is branched and supplied through an expansion valve and an evaporator individually connected to the freezing freezers, And a plurality of evaporator outlet temperature sensors provided on an outlet line of the evaporator connected to the refrigerating freezers to sense the temperature of the refrigerant,
Wherein,
Wherein when the temperature detected by the evaporator outlet temperature sensor is lower than the set temperature of the refrigerating freezer, the solenoid valve connected to the freezer freezer is shut off to prevent overcooling. The method according to claim 1,
And a compressor outlet temperature sensor provided at an outlet line of the compressor for sensing the temperature of the refrigerant,
Wherein,
Wherein the controller is configured to drive the cooling unit that cools the compressor when the temperature sensed by the compressor outlet temperature sensor is equal to or greater than a predetermined value to prevent the compressor from overheating.

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