CN100458317C - Refrigerating circulator of straight-cooled refrigerator - Google Patents

Abstract

The invention comprises a compressor for compressing the refrigerant, a condenser for condensing the compressed refrigerant by the compressor, a flow regulator for regulating the refrigerant flow to selectively distribute the condensed refrigerant, a expansion valve for the freezing room, a evaporator for the freezing room, more than two expansion valves for the cold room and a evaporator for the cold room.

Description

Refrigeration cycle device for direct cooling refrigerator

technical field

The invention relates to a refrigerating cycle device of a direct-cooling refrigerator, especially a refrigerating cycle device that can make the operating state of the refrigerating cycle device optimal when the compressor operates at a relatively low cooling force.

Background technique

Generally, a refrigerator is a device for freshly storing food for a long time by lowering the temperature inside the cabinet through a refrigeration cycle of compression-condensation-expansion-evaporation of the refrigerant, and is a daily necessity. Wherein, the direct-cooling refrigerator is equipped with evaporators in the freezing chamber and the refrigerating chamber respectively, and the refrigerating cycle device of the direct-cooling refrigerator will be described in detail below with reference to FIG. 1 .

The refrigeration cycle device of the direct cooling refrigerator includes a compressor 11 , a condenser 12 , an expansion valve 13 , an evaporator 14 for a freezer compartment, and an evaporator 15 for a refrigerator compartment. The components of the refrigeration cycle device are connected to each other through refrigerant pipes 16 . The compressor 11 raises the temperature/pressure of the refrigerant to a high temperature/high pressure refrigerant; the condenser 12 uses external air to condense the refrigerant flowing out of the compressor 11; the expansion valve 13 reduces the refrigerant flowing in from the condenser 12 due to its narrower diameter than other components Pressure: The evaporator 14 for the freezer and the evaporator 15 for the refrigerated room play a heat exchange role in absorbing heat in the cabinet according to the fact that the refrigerant evaporates into a low-pressure state when passing through the expansion valve 13. Therefore, the refrigerant compressed by the compressor 11 into a high-temperature/high-pressure body state is lowered in temperature when passing through the condenser 12 , and then lowered in pressure when passing through the expansion valve 13 . The refrigerant in the low-temperature/low-pressure state sequentially passes through the evaporator 14 for the freezer and the evaporator 15 for the refrigerating chamber to exchange heat, convert to a high-temperature/low-pressure state, and then flow into the compressor 11, thus repeating the above-mentioned process. The air is cooled by exchanging heat with the refrigerant passing through the evaporator 14 for the freezer and the evaporator 15 for the refrigerator, and is supplied to the freezer and the refrigerator.

However, the conventional direct-cooling refrigerator refrigerating cycle device has the following disadvantages: the compressor 11 is not considered to discharge a prescribed amount of refrigerant. load. Especially, when the refrigerating room evaporator 15 is closed, in order to prevent the expansion valve 13 from being overloaded, it is necessary to adjust the refrigerant flow rate flowing into the freezing room evaporator 14, but the conventional refrigeration cycle device is not equipped with a structure for adjusting the refrigerant flow rate.

Contents of the invention

The technical problem to be solved by the present invention is to provide a refrigerating cycle device that improves the entire refrigerating cycle, so that the refrigerating cycle device can operate optimally and achieve the maximum heat exchange efficiency even with a relatively small cooling force.

In order to solve the technical problem, the technical solution adopted in the present invention is: a refrigeration cycle device for a direct-cooling refrigerator, including a compressor for compressing the refrigerant, a condenser for condensing the refrigerant compressed by the compressor, and a refrigerant flow rate for adjusting the condensed refrigerant in the condenser. The flow regulator for selectively distributing the condensed refrigerant, the expansion valve for the freezer that flows into the refrigerant condensed from the condenser and expands, the evaporator for the freezer that flows into the refrigerant expanded from the expansion valve and performs heat exchange, and the expansion valve for the freezer. Two or more expansion valves for the refrigerator room that are separately installed on different refrigerant pipes to expand the refrigerant condensed by the condenser, and evaporators for the refrigerator room that flow into the refrigerant expanded from the expansion valve for the refrigerator room and perform heat exchange. The device includes a first regulating body, a second regulating body, a rotating plate and a driving part. The first regulating body communicates with the refrigerant outflow side pipe of the condenser; the second regulating body is respectively formed with pipes connected to the refrigerant inflow side pipe of the expansion valve for the freezer. A pair of refrigerant outflow passages on the freezing chamber side having mutually different diameters and a pair of refrigerant outflow passages on the refrigerating chamber side having mutually different diameters communicating with the refrigerant inflow side pipe of the expansion valve for the refrigerating chamber; A communication hole is formed between the regulator and the second regulator so that only two outflow channels of the second regulator communicate with the first regulator; the drive unit rotates the rotary plate.

The expansion valve for the refrigerator compartment is composed of a first expansion valve for the refrigerator compartment and a second expansion valve for the refrigerator compartment whose refrigerant flow distance is relatively shorter than that of the first expansion valve for the refrigerator compartment.

The refrigerant flow distance of the first expansion valve for the refrigerator compartment is relatively shorter than that of the expansion valve for the freezer compartment.

The refrigerant inflow side and the refrigerant outflow side of the expansion valve for the second refrigerating room are respectively connected to the refrigerant inflow side and the refrigerant outflow side of the expansion valve for the first refrigerating room, and the refrigerant inflow side of the expansion valve for the second refrigerating room is connected to the first refrigerating room. A refrigerant flow guide valve for guiding the direction of the refrigerant flow is also provided at the connecting portion between the refrigerant inflow side of the expansion valve.

An auxiliary evaporator is also installed on the refrigerant pipe between the expansion valve for the second refrigerating room and the evaporator for the refrigerating room, and the auxiliary evaporator flows into the refrigerant expanded from the expansion valve for the second refrigerating room, exchanges heat, and then The evaporator is used to provide refrigerant in the refrigerator.

The refrigerant flow distance of the auxiliary evaporator is shorter than the refrigerant flow distance of the refrigerating room evaporator.

It also includes a damper that flows into the compressor from the evaporator for the freezer and the evaporator for the refrigerator to equalize the pressure.

The beneficial effects of the present invention are: in the most commonly used energy-saving mode of relatively small cooling power, the operation of the whole system is optimized, so the total power consumption can be reduced; and the efficiency of the refrigeration cycle device is maximized.

Description of drawings

FIG. 1 is a structural diagram of a conventional general direct-cooling refrigerator refrigeration cycle device.

Fig. 2 is a structural diagram of the flow state of the refrigerant when the cooling power variable compressor in the refrigerating cycle device of the direct cooling refrigerator in the first embodiment of the present invention operates in the limit mode [power mode].

Fig. 3 is an exploded perspective view of important parts of the structure of the flow regulator in the refrigerating cycle device of the direct cooling refrigerator according to the first embodiment of the present invention.

Fig. 4 is a cross-sectional view of the structure of the flow regulator in the refrigerating cycle device of the direct-cooling refrigerator according to the first embodiment of the present invention.

5a to 5c are working diagrams of the operating state of the flow regulator in the refrigerating cycle device of the direct cooling refrigerator according to the first embodiment of the present invention.

FIG. 6 is a structural diagram of different refrigerant flow states when the cooling force variable compressor operates in limit mode in the refrigeration cycle device of the direct cooling refrigerator according to the first embodiment of the present invention.

7 is a structural view of the refrigerant flow state when the variable cooling capacity compressor in the refrigeration cycle device of the direct-cooling refrigerator according to the first embodiment of the present invention operates in an energy-saving mode.

Fig. 8 is a structural diagram of the flow state of the refrigerant when the cooling force variable compressor in the refrigeration cycle device of the direct-cooling refrigerator according to the second embodiment of the present invention operates in an energy-saving mode.

In the figure, 100: compressor; 200: condenser; 310: expansion valve for freezing room; 321: expansion valve for first cold room; 322: expansion valve for second cold room; 323: refrigerant flow guide valve; 400: Evaporator for freezer; 500: evaporator for refrigerator; 510: auxiliary evaporator; 600: flow regulator; 610: first regulator; 620: second regulator; 621: first outflow path; 622: 2nd outflow channel; 623: third outflow channel; 624: fourth outflow channel; 630: rotating plate; 631: communicating hole; 640: drive motor; 700: damper.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

As shown in Figure 2, the direct-cooling refrigerator refrigeration cycle device of the first embodiment of the present invention includes a compressor 100, a condenser 200, an expansion valve 310 for a freezer compartment, two or more expansion valves 321, 322 for a freezer compartment, a freezer The evaporator 400 for the room, the evaporator 500 for the refrigerator room, and the flow regulator 600 .

The components of the refrigeration cycle device are connected to each other by refrigerant pipes 16 .

The compressor 100 plays the role of compressing the refrigerant; although not shown in the figure, the compressor 100 can be a dual capacity compressor whose compression amount changes according to the direction of rotation. An example of a dual capacity compressor is described in Korean Patent Application No. 10-2001-0064083, but the present invention is not limited to the dual capacity compressor.

The compressor 100 may always generate the same cooling power, and may also be a compressor controlled by changing an activation voltage by a transformer or the like.

The condenser 200 condenses the compressed refrigerant flowing in from the variable cooling capacity compressor 100 , and the configuration of the condenser 200 is the same as that of the conventional general condenser 12 .

The expansion valve 310 for the freezer compartment lowers the pressure of the refrigerant condensed in the condenser 200 , and then supplies the refrigerant to the evaporator 400 for the freezer compartment.

The expansion valves 321 and 322 for the refrigerator compartment reduce the pressure of the refrigerant condensed in the condenser 200, and then supply the refrigerant to the first evaporator 500 for the refrigerator compartment.

The refrigerant flow distance of the refrigerating room evaporator 500 is relatively shorter than that of the freezing room evaporator 400 .

The expansion valves 321 and 322 for the refrigerating room are composed of a first refrigerating room expansion valve 321 having a shorter refrigerant flow distance than the refrigerating room expansion valve 310 and a second refrigerating room having a shorter refrigerant flowing distance than the first refrigerating room expansion valve 321 . An expansion valve 322 is used.

The refrigerant inflow side and the refrigerant outflow side of the second refrigerating room expansion valve 322 are respectively connected to the refrigerant inflow side and the refrigerant outflow side of the first refrigerating room expansion valve 321 .

A refrigerant flow guide valve 323 with a three-way function for guiding the refrigerant flow is also provided at the connecting portion between the refrigerant inflow side of the second refrigerating room expansion valve 322 and the refrigerant inflow side of the first refrigerating room expansion valve 321 .

Of course, the refrigerant flow guide valve 323 may be provided on the refrigerant outflow side of the first expansion valve 321 for refrigerating room, and constituted by a bypass valve for allowing the refrigerant to flow to the second expansion valve 322 for refrigerating room.

The flow regulator 600 plays a role of regulating the flow rate of the refrigerant condensed in the condenser 200 .

As shown in Figures 3 to 5c, the flow regulator 600 includes a first regulator 610 connected to the refrigerant outlet pipe of the condenser 200, and a second regulator connected to the refrigerant inlet pipes of the expansion valves 310, 321, and 322. The body 620, the rotating plate 630 provided between the adjustment bodies 610, 620 so as to be rotatable, and the drive unit that rotates the rotating plate 630 are constituted.

A pair of freezer-side refrigerant outflow passages 621, 622 communicating with the refrigerant inflow side duct of the expansion valve 310 for the freezer compartment and a pair of refrigerant inflow side ducts communicating with the expansion valve 321, 322 for the refrigerating room are respectively formed on the second regulating body 620. Refrigerating room-side refrigerant outflow channels 623 and 624 .

The diameters of the pair of refrigerant outflow channels 621, 622 on the freezer side are different from each other, and the diameters of the pair of refrigerant outflow channels 623, 624 on the refrigerating room are also different from each other, but the diameters of the refrigerant outflow channels 623, 624 on the refrigerating room are smaller. The diameters of the refrigerant outflow channels 621 and 622 on the freezing side are small.

The diameter D1 of a refrigerant outflow path (hereinafter referred to as the first outflow path) 621 on the side of the freezing chamber is larger than the diameter D2 of the other refrigerant outflow path (hereinafter referred to as the second outflow path) 622 on the side of the freezing chamber. The diameter D3 of the refrigerant outflow channel (hereinafter referred to as the third outflow channel) 623 is smaller than the diameter D2 of the second outflow channel 622, and the diameter of the other refrigerating room side refrigerant outflow channel (hereinafter referred to as the fourth outflow channel) 624 is D4 is smaller than the diameter D3 of the third outflow channel 623 .

The first outflow channel 621 and the second outflow channel 622 and the third outflow channel 623 and the fourth outflow channel 624 may be arranged not only vertically but also horizontally.

In the first embodiment of the present invention, the first outflow channel 621 and the second outflow channel 622 and the third outflow channel 623 and the fourth outflow channel 624 are perpendicular to each other as shown in FIG. 5 . At this time, the first outflow channel 621 and the fourth outflow channel 624 and the second outflow channel 622 and the third outflow channel are horizontal.

The rotating plate 630 of the flow regulator 600 is in the shape of an overall flat plate, and in order to keep only two outflow channels in communication with each other, a communication hole 631 is formed on the plate surface.

The driving part of the flow regulator 600 can rotate the rotating plate 630 by 90°, and is driven by the driving motor 640 combined with the central axis of the rotating plate 630 to generate a driving force.

Of course, the driving part can not only be directly coupled to the rotating plate 630 through a shaft, but also can transmit power to the rotating plate 630 by means of a conveyor belt, and can also be meshed on the outer peripheral surface of the rotating plate 630 through gears.

In the refrigeration cycle apparatus according to the first embodiment of the present invention, the evaporator 400 for the freezer compartment and the evaporator 500 for the refrigerator compartment are not connected in series, but are connected in parallel.

The refrigerants passing through the evaporators 400, 500 may have a pressure difference between them due to their different degrees of expansion and heat exchange. Therefore, in the first embodiment of the present invention, in order to make the refrigerants in the pipes converge to achieve pressure balance, the refrigerant outflow side pipes of the evaporators 400, 500 are also equipped with a damping part 700 for buffering.

The operation control process of the refrigerating cycle device for the direct cooling type refrigerator of the first embodiment of the present invention is described in detail below:

If the direct cooling type refrigerator starts to operate, the variable cooling capacity compressor 100 operates in an extreme mode. The extreme mode is an operation mode in which the cooling capacity variable compressor 100 generates the maximum cooling capacity.

As shown in Figure 5a, when the cooling force variable compressor 100 is operating in the limit mode, the flow regulator 600 maximizes the refrigerant flow rate of the expansion valve 310 for the freezer compartment, and at the same time maximizes the refrigerant flow rate of the expansion valves 321 and 322 for the refrigerator compartment. Traffic is minimal.

Of course, in order to minimize the start-up torque during operation in the limit mode, the refrigerant may be supplied only to the expansion valve 310 for the freezer compartment under the control of the flow regulator 600 .

At this time, the rotating plate 630 rotates as shown in Figure 5b, and only the first outflow channel 621 and the second outflow channel 622 of the flow regulator 600 are connected to the first regulating body 610. At this time, the flow state of the refrigerant is shown in the figure 6.

Moreover, after operating in the extreme mode for a certain period of time, when the entire refrigeration cycle device reaches a steady state, the variable cooling capacity compressor 100 operates in the energy-saving mode.

Although the energy-saving mode is lower than the maximum cooling power that can be generated by the variable cooling capacity compressor 100, it is also an operation mode that can generate cooling power without lowering the operating efficiency of the entire refrigeration cycle apparatus.

When the cooling force variable compressor 100 is running in the energy-saving mode, the flow regulator rotates clockwise or counterclockwise as shown in Figure 5c, so that the refrigerant flow rate of the expansion valve 310 for the freezing chamber is minimized, and at the same time, the refrigerant flow rate for each refrigeration chamber is reduced. The refrigerant flow rates of the expansion valves 321 and 322 are the largest. If the refrigerant flow rate on the refrigerating room side decreases as in limit mode operation, the overall operating rate of the refrigerator will increase, so in order to prevent the operating rate from increasing, the refrigerant flow rate on the refrigerating room side should be greater than that in limit mode operation.

In particular, when operating in the energy-saving mode, as shown in FIG. 7 , the refrigerant flows to the second refrigerating room expansion valve 322 by controlling the refrigerant flow pilot valve 323 . The decrease in resistance of the induction process prevents the operation rate of the compressor 100 from increasing.

With the structure of the first embodiment of the present invention and its operation control method, the refrigerator can achieve optimal efficiency through the additional energy-saving mode during operation, so the operating rate increase and power consumption of the compressor 100 are reduced.

In addition, in the second embodiment of the present invention, as shown in FIG. 8 , an auxiliary evaporator 510 with a relatively higher evaporation temperature is added to the structure of the refrigeration cycle device in the first embodiment of the present invention.

The auxiliary evaporator 510 is provided on the refrigerant pipe between the expansion valve 322 for the second refrigerating room and the evaporator 500 for the refrigerating room, and the refrigerant flow distance is shorter than that of the evaporator 500 for the refrigerating room, so it has a higher Evaporation temperature. In particular, the refrigerant outflow side of the auxiliary evaporator 510 is connected to the refrigerant outflow side of the first refrigerating room expansion valve 321 or the refrigerant inflow side of the refrigerating room evaporator 500 .

The auxiliary evaporator 510 is equipped in a place where food such as vegetables needs to be stored at a relatively high temperature.

The operation process of the refrigeration cycle device in the second embodiment of the present invention is roughly the same as that in the first embodiment, except that the refrigerant expanded through the expansion valve 322 for the second refrigerating room passes through the auxiliary evaporator 510 and is supplied to The evaporator 500 for a refrigerator is different from the first embodiment.

As mentioned above, if the auxiliary evaporator 510 is used to increase the flow distance of the refrigerant, sufficient heat exchange efficiency can be obtained even in a relatively small cooling force state.

Claims (7)

1, a kind of refrigerating circulator of straight-cooled refrigerator, the compressor (100) that comprises compression refrigerant, the condenser (200) of the refrigerant of condensate compressor compression, be adjusted in the cold medium flux of condenser condenses and selectivity is distributed the flow regulator (600) of condensation refrigerant, inflow is from the refrigerant of condenser condenses and the refrigerating chamber expansion valve (310) that expands, inflow is from the refrigerant of expansion valve expansion and the refrigerating chamber evaporimeter (400) that carries out heat exchange, separate with expansion valve with refrigerating chamber and to be arranged on the different refrigerant pipes and two above refrigerating chamber expansion valves of the refrigerant of expansion condenser condensation, refrigerant that inflow is expanded with expansion valve from refrigerating chamber and the refrigerating chamber that carries out heat exchange are with evaporimeter (500), it is characterized in that described flow regulator (600) comprises the 1st control agent (610), the 2nd control agent (620), swivel plate (630) and drive division, the 1st control agent (610) is communicated with condenser refrigerant outflow side pipeline; Be formed with respectively on the 2nd control agent (620) and be communicated with a pair of refrigerating chamber side refrigerant outflow stream (621 with mutual different-diameter of refrigerating chamber with expansion valve refrigerant inflow side pipeline, 622), with a pair of refrigerating chamber side refrigerant outflow stream (623,624) with mutual different-diameter of connection refrigerating chamber with expansion valve refrigerant inflow side pipeline; Swivel plate (630) is provided between the 1st control agent (610) and the 2nd control agent (620) rotatably, and in order to make respectively flowing out of the 2nd control agent (620) have only two outflow streams and the 1st control agent (610) to be connected to form intercommunicating pore (630) in the stream; Drive division rotation swivel plate (630).

2, refrigerating circulator of straight-cooled refrigerator according to claim 1 is characterized in that described refrigerating chamber is made of with expansion valve (322) with the 2nd short refrigerating chamber of expansion valve with expansion valve (321) and refrigerant distance the 1st refrigerating chamber that compares that flows the 1st refrigerating chamber with expansion valve.

3, refrigerating circulator of straight-cooled refrigerator according to claim 1 and 2 is characterized in that described the 1st refrigerating chamber flows short with expansion valve (310) apart from the refrigerating chamber that compares with the refrigerant of expansion valve (321).

4, refrigerating circulator of straight-cooled refrigerator according to claim 2, it is characterized in that the 2nd refrigerating chamber is connected with the refrigerant outflow side with the refrigerant inflow side of the 1st refrigerating chamber with expansion valve (321) with the refrigerant outflow side separately with the refrigerant inflow side of expansion valve (322), the 2nd refrigerating chamber with the refrigerant inflow side of expansion valve (322) and the 1st refrigerating chamber with the movement-oriented valve of refrigerant (323) that also is equipped with the guiding refrigerant flow direction on the connecting portion between the refrigerant inflow side of expansion valve (321).

5, refrigerating circulator of straight-cooled refrigerator according to claim 4, it is characterized in that also being equipped with auxiliary evaporator (510) with expansion valve (322) and refrigerating chamber on the refrigerant pipe between the evaporimeter (500) at the 2nd refrigerating chamber, and auxiliary evaporator (510) flows into from the refrigerant of the 2nd refrigerating chamber with expansion valve (322) expansion, carries out providing refrigerant to refrigerating chamber with evaporimeter (500) after the heat exchange.

6, refrigerating circulator of straight-cooled refrigerator according to claim 5 is characterized in that the refrigerant of described auxiliary evaporator (510) flows apart from flowing apart from short than the refrigerant of refrigerating chamber with evaporimeter (500).

7, refrigerating circulator of straight-cooled refrigerator according to claim 1, it is characterized in that also including from refrigerating chamber and flow into refrigerant with evaporimeter (500), make it reach the damper portion (700) of inflow compressor after the isostasy with evaporimeter (400) and refrigerating chamber.

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