JP2001330360A - Refrigerator and freezer air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide either a refrigerator or a freezer air conditioner in which there is provided a cooler for individually cooling a plurality of storing chambers and then an efficient cooling in the refrigerator is carried out. SOLUTION: There is provided a refrigerator having a freezing cycle in which a first evaporator for cooling an inner part of a freezing chamber, a second evaporator for cooling an inner part of a refrigerator chamber, a compressor having a first compressing element and a second compressing element for compressing refrigerant, and a condenser are connected to each other. The refrigerator is comprised of a first refrigerant flow passage communicated between the first evaporator and the first compressing element, a second refrigerant flow passage between the first compressing element and the second compressing element, and a third refrigerant flow passage communicated between the second evaporator and the second refrigerant flow passage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator having a plurality of evaporators and a compressor having a compression element, and a refrigerating and air-conditioning apparatus.

[0002]

2. Description of the Related Art Since the ratio of refrigerators to household electricity bills is large, it is important to reduce the power consumption of refrigerators in order to reduce household electricity bills. As a technique for solving this, two evaporators having different evaporation temperatures, two compression elements, and each outlet of the two evaporators is connected to two evaporators.
A refrigerator connected to each suction passage of each compression element has been considered. One example of such a prior art is disclosed in Japanese Patent Application Laid-Open No. 5-223368.

In the refrigerator disclosed in the above-mentioned prior art, a freezer compartment evaporator for cooling a freezer compartment and a refrigerator compartment evaporator for cooling a refrigerator compartment having different evaporation temperatures are connected in parallel, and two-stage compression is performed. It has a number of compression elements. The suction passage of the low-stage compression element is connected to the outlet of the freezing room evaporator, and the discharge passage of the low-stage compression element is joined to the outlet of the refrigerating room evaporator and connected to the suction passage of the high-stage compression element. The discharge passage of the element is connected to the condenser inlet.

[0004] The low-stage compression element compresses the gas refrigerant flowing out of the freezer compartment evaporator from a low pressure at the evaporation pressure level of the freezer compartment to an intermediate pressure at the evaporation pressure level of the refrigerator compartment evaporator. The element compresses both the gas refrigerant compressed to the intermediate pressure by the low-stage compression element and the gas refrigerant flowing out of the refrigerator evaporator from the intermediate pressure to a high pressure of the condensation pressure of the condenser.

[0005] In such a conventional technique, the gas refrigerant flowing out of the refrigerator compartment evaporator having a higher evaporation temperature than that of the freezer compartment evaporator is not depressurized and compressed from a low pressure.
It compresses from the intermediate pressure, and attempts to reduce the compression power of the low-stage compression to significantly reduce the power consumption of the refrigerator.

As described above, a refrigerator having an evaporator in a freezer compartment and a refrigerator compartment has a single evaporator, compared to a refrigerator in which both the freezer compartment and the refrigerator compartment are cooled by forced circulation of cool air. Since the evaporation temperature of the refrigerator evaporator can be increased, the temperature of the cool air discharged into the refrigerator can be increased, and the humidity can be maintained high.

[0007]

Generally, the temperature of the freezer compartment of a refrigerator is -18 ° C. or less, while the temperature of the refrigerator compartment is 0 ° C.
It is required that the temperature is 5 ° C. or lower, which is higher than the temperature. In the prior art disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 5-223368, the freezing compartment and the refrigerating compartment are simultaneously cooled by using two compression elements and two evaporators having different evaporating temperatures, so that a large amount of power is consumed. 1 is shown.

However, in the operation of cooling the freezer compartment and the refrigerating compartment in parallel according to the above-mentioned prior art, the freezer compartment is cooled when the freezer compartment temperature is higher than a predetermined temperature, even if the refrigerator compartment temperature is lower than a predetermined temperature. However, there is a problem that the refrigerator compartment is cooled more than necessary, and no consideration has been given to the fact that the storage in the refrigerator compartment is adversely affected. In order to solve such a problem, if an electric heater for warming the refrigerator compartment is provided so that the food in the refrigerator compartment does not freeze, there is a problem that power consumption is increased.

In order to solve such a problem,
Although it is necessary to cool each chamber independently, the structure of a compressor or a refrigeration cycle for achieving such a function has not been considered in this prior art. In particular, the prior art has not considered a configuration of a refrigerator that efficiently operates when switching between an operation of simultaneously cooling each room and an operation of simultaneously operating each room.

It is an object of the present invention to provide a refrigerator or a refrigerating air conditioner which includes a cooler for individually cooling a plurality of storage rooms and efficiently cools the inside of the refrigerator.

[0011]

SUMMARY OF THE INVENTION The above objects are attained by a first evaporator for cooling a freezer compartment, a second evaporator for cooling a refrigerator compartment, a first compression element for compressing a refrigerant, and a second evaporator. In a refrigerator including a refrigerating cycle in which a compressor having a compression element and a condenser are connected, the first evaporator and the first evaporator are connected to each other.
A first refrigerant flow path communicating with the first compression element, a second refrigerant flow path communicating from the first compression element to the second compression element, the second evaporator, and the second evaporator. This is achieved by providing a third refrigerant flow path communicating with the second refrigerant passage.

A first evaporator for cooling the freezer compartment, a second evaporator for cooling the refrigerator compartment, and a compressor having a first compression element and a second compression element for compressing the refrigerant. And a condenser connected to the first evaporator and the first and second evaporators, wherein the first evaporator communicates with the first compression element. The flow path of the first refrigerant, the flow path of the second refrigerant that communicates from the first compression element to the second compression element, the second evaporator, and the second refrigerant path. And a means for suppressing the flow of the refrigerant from the condenser to the second evaporator.

Further, an operation in which the refrigerant flows from the first and second evaporators through the flow paths of the first, second and third refrigerants, and an operation of the refrigerant flowing from the condenser to the second evaporator is performed. The flow is suppressed and the refrigerant flows through the first evaporator to the compressor. Furthermore, the flow of the refrigerant from the condenser to the first evaporator is suppressed, and the refrigerant is achieved by flowing the refrigerant to the compressor through the second evaporator.

A compressor having a first evaporator for cooling the freezer compartment, a second evaporator for cooling the refrigerator compartment, and a first compression element and a second compression element for compressing the refrigerant; , A refrigerator provided with a refrigeration cycle connected to a condenser, wherein the refrigerant flows in the order of the first evaporator, the first compression element, the second compression element, and the second evaporator, A flow of a first refrigerant flowing in the order of two compression elements, and a flow of a second refrigerant in which the refrigerant flows through the first evaporator to the compressor. This is achieved by switching and operating the flow of the second refrigerant.

Further, this is achieved by switching the operation to a third refrigerant flow through which the refrigerant flows through the second evaporator to the compressor. Furthermore, when the refrigerant flows to the first and second compression elements through the first evaporator, the refrigerant flows in parallel to the first compression element and the second compression element. This is achieved by:

Further, operating means is provided on the door of the refrigerator and can be operated by a user to adjust the operation of the refrigerator, and any one of the first, second or third operation by the flow of the refrigerant is provided. Achieved by being selectable. Furthermore, adjusting means for variably adjusting the rotation of the electric motor driving the compressor, and operation by the flow of the second refrigerant is selected by operating the operating means, and the adjusting means controls the compressor by the adjusting means. This is achieved by increasing the rotational speed.

A first cooler for cooling the first storage chamber, a second cooler for cooling the second storage chamber, a compressor having first and second compression chambers, A refrigerator having a refrigeration cycle to which a condenser is connected, a refrigerant pipe connected to a discharge passage from the first compression chamber and an inlet of the condenser, an outlet of the condenser, and a first cooler. And a refrigerant pipe connecting the second cooler, a first suction passage connected to the first cooler and the first compression chamber, the second cooler and the second cooler. A second suction passage connected to the compression chamber and a passage connected to the first and second suction passages are provided for stopping a flow of the refrigerant from the first suction passage to the second suction passage. A first valve means, a passage connected to a discharge passage from the first compression chamber and a discharge passage from the second compression chamber; A second valve means for stopping a flow of the refrigerant from a discharge passage of the first compression chamber to a discharge passage of the second compression chamber; a discharge passage from the second compression chamber; and the first suction. Adjusting means for adjusting the flow of the refrigerant passing through the connection passage to the passage, the first cooler and the first suction passage, and the flow of the refrigerant flowing from the second compression chamber to the first compression chamber; It is achieved by having.

Further, the adjusting means is provided on a refrigerant pipe connecting the condenser and the first and second coolers, and is a branch portion for branching the refrigerant pipe to the first and second coolers. A first adjusting means provided on a refrigerant pipe between the branch portion and the first cooler to adjust a flow of the refrigerant in the pipe; a discharge passage from the second compression chamber; Achieved by providing a second adjusting means provided on a connecting passage with the first suction passage for adjusting the flow of the refrigerant in the passage, and a controlling means for adjusting the first and second adjusting means. Is done.

A first cooler for cooling the first storage chamber, a second cooler for cooling the second storage chamber, a compressor having first and second compression chambers, A refrigerator having a refrigeration cycle to which a condenser is connected, a refrigerant pipe connected to a discharge passage from the first compression chamber and an inlet of the condenser, an outlet of the condenser, and a first cooler. And a refrigerant pipe connecting the second cooler, a first suction passage connected to the first cooler and the first compression chamber, the second cooler and the second cooler. A second suction passage connected to the compression chamber, a connection passage between the discharge passage from the second compression chamber and the first suction passage, the first compression chamber and the second suction passage;
This is achieved by providing an airtight container in which the compression chamber is disposed inside, and an opening communicating with the first suction passage and the space in the airtight container.

A first valve means provided in a passage connected to the first and second suction passages for stopping a flow of the refrigerant from the first suction passage to the second suction passage; The refrigerant flowing from the discharge passage of the first compression chamber to the discharge passage of the second compression chamber is provided in a passage connected to the discharge passage from the first compression chamber and the discharge passage from the second compression chamber. The second valve means for stopping the flow, the flow of the refrigerant passing through the first cooler and the first suction passage, and the flow of the refrigerant flowing from the second compression chamber to the first compression chamber are adjusted. This is achieved by providing an adjusting means.

Further, a first evaporator and a second evaporator for cooling the room, a compressor having a first compression element and a second compression element for compressing a refrigerant, and a condenser are provided. In a refrigeration air conditioner having a connected refrigeration cycle, a flow path of a first refrigerant in which the first evaporator and the first compression element are communicated, and a second compression path from the first compression element This is achieved by providing a flow path of a second refrigerant that communicates with the element, and a flow path of a third refrigerant that communicates the second evaporator and the second refrigerant path.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. [Embodiment 1] FIG. 1 is a schematic diagram of a refrigerating cycle of a refrigerator according to a first embodiment of the present invention. FIG. 2 is a longitudinal sectional view schematically showing a refrigerator using the refrigeration cycle of the embodiment shown in FIG. FIG. 3 is a longitudinal sectional view showing the internal structure of the compressor provided in the refrigeration cycle of the embodiment shown in FIG. FIG. 4 shows a second cylinder, a partition plate, a first cylinder, which are the compressor parts shown in FIG.
FIG. 4 is a perspective view illustrating a structure of a sub bearing and a first discharge chamber cover. FIG. 5 is a perspective view showing a valve which is a compressor part shown in FIG. FIG. 6 is a perspective view showing a structure of a main bearing, a second discharge chamber sub-cover, and a second discharge chamber main cover which are compressor parts shown in FIG. FIG. 7 is a view showing a second cylinder portion of a cross section XX of the compressor shown in FIG. 3. FIG. 8 is a graph showing the difference between the pressure in the compression chamber and the pressure in the closed vessel during one rotation when the compressor of the embodiment shown in FIG. 3 performs two-stage compression. FIG. 9 is a graph showing the difference between the pressure in the compression chamber and the pressure in the closed vessel during one rotation when the compressor of the embodiment shown in FIG. 3 performs single-stage compression. FIG. 10 is a flowchart showing an operation control flow of the refrigerator of the embodiment shown in FIG.

In FIG. 1, reference numeral 10 denotes a compressor, and reference numeral 40 denotes a closed container. The closed container 40 has two compression elements (low-stage compression element 11 and high-stage compression element 12). In this embodiment, as will be described later, when these two compression elements are connected in series, the refrigerant flowing through the refrigeration cycle flows through these compression elements in order, and the individual compression elements twice. Compressed. Also, when two compression elements are connected in parallel, the refrigerant flowing through the cycle passes through the evaporator from the condenser, then is divided into individual compression elements and flows in parallel (simultaneously). After being compressed once by each compression element, it is discharged and merges and flows along the refrigerant passage. That is, it flows into the low-stage compression element 11 and also flows into the high-stage compression element 12 separately.

In this embodiment, the low-stage compression element 11
And the displacement of the high-stage compression element 12 are set to be equal or almost equal.

Reference numerals 11a and 11b denote low-stage compression elements 1 respectively.
Reference numeral 12a, 12b denotes a suction passage and a discharge passage of the high-stage compression element 12, respectively. 12c
Is a pressure-generating passage in the closed vessel that connects the suction passage 12a of the high-stage compression element 12 to the inside of the closed vessel 40.

Reference numeral 13a denotes a suction-side check valve which is arranged in the closed vessel 40 and between the suction passage 11a of the low-stage compression element 11 and the suction passage 12a of the high-stage compression element 12. When the gas refrigerant pressure in the suction passage 12a of the high-stage compression element 12 is higher than the gas refrigerant pressure in the suction passage 11a of the low-stage compression element 11, the valve is closed, and the valve is closed. Is lower than the gas refrigerant pressure in the suction passage 11a of the low-stage compression element 11, the valve is opened, and the gas refrigerant on the suction passage 11a side of the low-stage compression element 11 It flows into the suction passage 12a.

Reference numeral 13b denotes a discharge-side check valve, which is disposed in the closed casing 40 and between the discharge passage 11b of the low-stage compression element 11 and the discharge passage 12b of the high-stage compression element 12. When the gas refrigerant pressure in the discharge passage 12b of the high-stage compression element 12 is higher than the gas refrigerant pressure in the discharge passage 11b of the low-stage compression element 11, the valve is in a closed state and the discharge passage 12b of the high-stage compression element 12 is closed. When the gas refrigerant pressure of the lower stage compression element 11 is lower than the gas refrigerant pressure of the discharge passage 11b, the valve is in an open state, and the gas refrigerant on the discharge passage 11b side of the lower stage compression element 11 It flows into the discharge passage 12b.

The refrigerant discharge passage 12b of the high-stage compression element 12
Is connected to the inlet of the condenser 20. Also, the condenser 20
Is branched into two, one of which is sequentially connected to a first capillary 21 as a decompression device, a freezer evaporator 22, and a suction passage 11a of the low-stage compression element 11. The other branched refrigerant pipe is sequentially connected to a first solenoid valve 23, a second capillary 24 as a decompression device, a refrigerator evaporator 25, and a suction passage 12a of the high-stage compression element 12.

The solenoid valve 23 opens and closes the valve when a voltage is applied to regulate the flow of the refrigerant inside the refrigerant pipe. When the voltage is not supplied, the flow of the refrigerant to the refrigerator compartment evaporator 25 is allowed to pass in an open state, and when the voltage is not supplied, the flow of the refrigerant to the refrigerator compartment evaporator 25 is blocked in the closed state.

The first capillary 21 is disposed so as to be able to exchange heat between the outlet of the freezer evaporator 22 and the suction passage 11 a of the low-stage compression element 11. The second capillary 24 is connected to the outlet of the evaporator 25 for the refrigerator and the high-stage compression element 1.
The two suction passages 12a are disposed so as to be able to exchange heat with each other. Thereby, the refrigerant in the capillaries 21 and 24 is cooled while being decompressed.
Enthalpy of the evaporator is reduced, and the refrigeration effect of the evaporator can be increased. On the other hand, since the refrigerant between the outlets of the evaporators 22 and 25 and the suction passages 11a and 12a is heated, dew on the piping can be prevented.

Reference numeral 26 denotes a second solenoid valve, and 27 denotes an intercooler. Through the solenoid valve 26 and the intercooler 27, the discharge passage 11b of the low-stage compression element 11 and the suction passage 12a of the high-stage compression element 12 are connected. Connected.

The second solenoid valve 26 opens and closes the valve by applying a voltage in the same manner as the first solenoid valve 23. When the second solenoid valve 26 is not energized, the second solenoid valve 26 is open.
1b from the discharge passage 11b of the low-stage compression element 11 to the suction passage 12a of the high-stage compression element 12 while passing the gas refrigerant flow from the discharge passage 11b to the suction passage 12a of the high-stage compression element 12. Blocks the flow of gas refrigerant.

The intercooler 27 exchanges heat between the gas refrigerant in the discharge passage 11b of the low-stage compression element 11 and air to cool the gas refrigerant.

Reference numeral 30 denotes a condenser fan, 31 denotes a freezing room evaporator fan, and 32 denotes a refrigerator room evaporator fan.

FIG. 2 is a schematic sectional view of a refrigerator using the refrigeration cycle of FIG. 1 are given the same reference numerals. 1 is a refrigerator main body, 2 is a freezing room, 3 is a refrigerating room, 4 is an air path forming plate of the freezer evaporator 22, and 5 is an air path forming plate of the refrigerating room evaporator 25. Reference numeral 6 denotes an electric heater for defrosting the evaporator 22 for the freezer compartment, and 7 denotes an electric heater for defrosting the evaporator 25 for the refrigerator compartment. Do the frost. Reference numeral 8 denotes a temperature sensor for detecting the temperature in the freezer compartment 2, and reference numeral 9 denotes a temperature sensor for detecting the temperature in the refrigerator compartment 3. Arrows in the freezer compartment 2 and the refrigerator compartment 3 indicate the direction of airflow.

The compressor 10, the condenser 20, the solenoid valves 23,
6. The intercooler 27 and the condenser fan 30 are disposed at the bottom of the refrigerator main body 1, and the capillaries 21 and 24 are disposed (not shown) in the rear heat insulating material of the refrigerator main body 1.

Temperatures are detected by the temperature sensors 8 and 9, and their outputs are input to the control device 101 of the refrigerator. The control device 101 determines and determines whether or not the cooling operation of each of the storage rooms 2 and 3 is necessary based on the outputs of the temperature sensors 8 and 9. Compressor 10, fan 30 in machine room, fan 3 in each storage room
The number of rotations of 1, 32 is set, and a command is given to inverters 102, 103, 104, 105 to adjust these rotation numbers. At the same time, a command for an opening / closing operation is given to the solenoid valves 23 and 26.

When the controller 101 detects a user command from a switch or button 106 provided on the refrigerator 1, regardless of the outputs of the temperature sensors 8 and 9,
A command may be given to the inverters 102 to 105 and the solenoid valves 23 and 26 to forcibly set the operation of the refrigerator. Such an operation is appropriate when the user wants to perform cooling and freezing in a short time. When the user instructs freezing in a short time, supply of the refrigerant to the evaporator 25 for the refrigerator is stopped and the refrigerant is supplied only to the evaporator 22 for the refrigerator in order to increase the cooling capacity of the refrigerator. Is supplied to cool the freezing room independently, and the solenoid valves 23 and 26 are set so that the refrigerant flows in parallel to the two compression elements 11 and 12. In this embodiment, the solenoid valves 23 and 26 are closed.

On the other hand, when such a short cooling operation is not necessary, for example, when the difference between the temperature in the freezer compartment and the set temperature is small, the freezer compartment is required to operate more efficiently. Even when cooling alone, the compression element 11,
12 so that the refrigerant flows into the two-stage compression in order.
3, 26 may be set. In this embodiment, the solenoid valve 23 is closed and the solenoid valve 26 is opened. However, when this operation is performed, in this embodiment, since the displacements of the compression elements 11 and 12 are almost the same, the compression element 11 on the lower stage side hardly performs the compression work. Cannot be expected to improve efficiency. Therefore, in order to improve the efficiency when performing the cooling operation in each chamber alone, the displacement of the compression elements 11 and 12 may be varied to reduce the volume of the compression element 12.

FIG. 3 is a longitudinal sectional view of the compressor 10 of FIG. The compressor 10 is a two-cylinder rotary compressor in which an electric motor unit and a compression mechanism unit are housed in a closed container 40.

The electric motor section is composed of a stator 41 fixed to the closed casing 40 by shrink fitting or the like and a rotor 43 fixed to the crankshaft 42.

The compression mechanism section has two compression elements corresponding to the low-stage compression element 11 and the high-stage compression element 12 in FIG. The high-stage compression element includes a main bearing 44 that supports the crankshaft 42, a second cylinder 45, a partition plate 46, and a roller 52 (a roller 52a and a vane 52b inserted into the eccentric portion 42a of the crankshaft 42). See Figure 7 below),
It is constituted by sliding members 54a and 54b (see FIG. 7 described later) that sandwich the vane 52b that enables the reciprocating motion and the swinging motion of the vane 52b. The low-stage compression element includes the partition plate 46, the first cylinder 47, the crankshaft 42,
Bearing 48 for supporting the eccentric portion 42b of the crankshaft 42
The roller 53 includes a roller portion and a vane portion (not shown) inserted into the roller 53, and a sliding member (not shown) that sandwiches the vane portion that enables the reciprocating motion and the swinging motion of the vane portion of the roller 53. ing. The main bearing 44 is fixed to the closed container 40 by welding or the like.

The two eccentric portions 42a, 4a of the crankshaft 42
2b are formed so as to have a phase difference of 180 ° in the rotation direction, and the rollers 52, 53 are eccentrically rotated in the respective cylinders 45, 47 with the rotation of the crankshaft 42. I have. Each roller 52, 5
The vane 3 functions to divide the interior of each of the cylinders 45 and 47 into a suction chamber and a compression chamber. With the rotation of the crankshaft 42, the compression of the gas refrigerant is alternately performed at 180 ° intervals in the two compression elements.

Reference numeral 11a 'denotes a low-stage compression element suction pipe which partially constitutes a suction passage 11a of the low-stage compression element 11 in FIG.
b 'is a low-stage compression element discharge pipe which partially forms the discharge passage 11b of the low-stage compression element 11 of FIG. 1, and 12a' is a high-stage compression which partially forms the suction passage 12a of the high-stage compression element 12 of FIG. The element suction pipe 12b 'is a high-stage compression element discharge pipe that partially configures the discharge passage 12b of the low-stage compression element 12 in FIG.

Reference numeral 49 denotes a first discharge chamber cover forming a first discharge chamber together with the sub-bearing 48, and reference numerals 50 and 51 denote second discharge chamber sub-covers forming a first discharge chamber together with the main bearing 44. 2 is a main discharge chamber cover.

FIGS. 4 (a), (b), (c), (d),
(E) shows the second cylinder 45, the partition plate 46, the first cylinder 47, the sub bearing 48, and the first discharge chamber cover 49, which are parts of the compressor 10 shown in FIG. It is the perspective view seen from the other side.

In the second cylinder 45 shown in FIG. 4 (a), one of the gourd-shaped spaces 45m incorporates sliding members 54a and 54b which sandwich the vane portion of the roller 51, and the other space is a vane portion. This is a space for preventing interference between the cylinder and the cylinder (see FIG. 7 described later). 45e
1 is a hole partially forming a passage connecting the suction passage 11a of the low-stage compression element 11 and the suction-side check valve 13a in FIG. 1, and 45f is a discharge passage 11b and a discharge-side check of the low-stage compression element 11 in FIG. A hole 45g partially forming a passage connecting the valve 13b is a concave portion and a cutout partially forming the suction passage 12a of the high-stage compression element 12 in FIG.

45u is two holes for fixing the cylinder 45 to the main bearing 44 with bolts, and 45v is a partition plate 4
6. Two female screw holes 45w for fixing the first cylinder 47 to the second cylinder 45 with bolts are provided by the partition plate 46, the first cylinder 47, the auxiliary bearing 48, and the first discharge chamber cover. There are four holes for bolting to the main bearing 44 together with 49.

In the partition plate 46 shown in FIG.
46e is a hole which partially forms a passage connecting the suction passage 11a of the low-stage compression element 11 of FIG.
6f is a hole which partially forms a passage connecting the discharge passage 11b of the low-stage compression element 11 of FIG.
g is a hole that partially forms the suction passage 12a of the high-stage compression element 12 in FIG.

Reference numeral 46v denotes two holes for bolting the first cylinder 47 to the second cylinder 45 together with the first cylinder 47,
46w is a second cylinder 45, a first cylinder 47,
The main bearing 4 together with the auxiliary bearing 48 and the first discharge chamber cover 49
There are four holes for bolting to 4.

In the first cylinder 47 shown in FIG. 4 (c), 47m is equivalent to 45m in FIG. 4 (a). 4
7e is a cutout partially forming the suction passage 11a of the low-stage compression element 11 of FIG. 1, and 47f is a part of a passage connecting the discharge passage 11b and the discharge-side check valve 13b of the low-stage compression element 11 of FIG. The hole to be formed, 47g, is a hole that partially forms the suction passage 12a of the high-stage compression element 12 in FIG.

Reference numeral 47v denotes two holes for bolting together with the partition plate 46 to the second cylinder 45, and 47w denotes a second cylinder 45, the partition plate 46, the first cylinder 4
7, four holes for fastening the main bearing 44 together with the auxiliary bearing 48 and the first discharge chamber cover 49 by bolts.

In the auxiliary bearing 48 shown in FIG.
8e is a hole that partially forms the suction passage 11a of the low-stage compression element 11 of FIG. 1, 48t is a recess for forming a valve seat or the like of the low-stage compression element discharge valve, 48d is a discharge hole, and 48d ′ is a drawing. 5
This is a female screw hole for fixing the reed valve 61 shown in FIG. 5A and the valve retainer 62 shown in FIG. Here, the reed valve 61 functions as a discharge valve. 48
f is a concave portion that partially configures the discharge passage 11b of the low-stage compression element 11 of FIG. 1 together with the first discharge chamber cover 49, forms a discharge chamber, and functions as a muffler by changing the flow path cross-sectional area. 48f 'is a hole which partially forms a passage connecting the discharge passage 11b of the low-stage compression element 11 and the discharge-side check valve 13b of FIG. 1, and 48g is a suction passage 1 of the high-stage compression element 12 of FIG.
This is a hole partially forming 2a.

48w is a hole for fastening four bolts.
Reference numeral 48k denotes an oil supply hole for supplying lubricating oil to the crankshaft 42 by an oil supply pump utilizing the reciprocating motion of the vane portion of the roller 53 and the like.

The first discharge chamber cover 49 shown in FIG.
In the figure, 49e is a hole which partially forms the suction passage 11a of the low-stage compression element 11 of FIG. 1, is connected to the low-stage compression element suction pipe 11a 'of FIG. 3, and 49f is the low-stage compression element 11 of FIG.
3 is connected to the low-stage compression element discharge pipe 11b 'in FIG. 3, and 49g is a hole partially forming the suction passage 11a in the high-stage compression element 12 in FIG. 3
Is connected to the high-stage compression element suction pipe 12a '. 49w
Are four bolt fastening holes. Reference numeral 60 denotes an oil supply passage.

FIGS. 6 (a), 6 (b) and 6 (c) show a main bearing 44, which is a component of the compressor 10 shown in FIG.
Second discharge chamber sub-cover 50, second discharge chamber main cover 51
FIG. 3 is a perspective view of the motor viewed from the motor unit side.

In the main bearing 44 shown in FIG.
4t is a recess for forming a valve seat or the like of the high-stage compression element discharge valve, 44d is a discharge hole, 44d 'is a reed valve 61 shown in FIG. 5A, and a valve shown in FIG. 5B. A female screw hole for fixing the retainer 62 to the main bearing 44 with a bolt. Here, the reed valve 61 functions as a discharge valve.

44t 'is a suction-side check valve 13a shown in FIG.
44e is a hole of a check valve, 44e 'is a reed valve 61 shown in FIG.
This is a female screw hole for fixing the valve retainer 62 shown in FIG. 5B to the main bearing 44 with a bolt. Reed valve 61 here
Works as a check valve. That is, when the gas refrigerant pressure in the space of the concave portion 44t 'is higher than the gas refrigerant pressure in the hole 44e, the reed valve is in close contact with the valve seat, and the valve is in a closed state,
When the gas refrigerant pressure in the space of the concave portion 44t 'is lower than the gas refrigerant pressure in the hole 44e, the reed valve floats from the valve seat, and the valve is opened.

Reference numeral 44g denotes a hole which partially forms a passage connecting the suction passage 12a of the high-stage compression element 12 and the suction-side check valve 13a in FIG. 44g ′ is a concave portion, together with the second discharge chamber cover 50, a concave portion 44g that constitutes a check valve with the hole 44g.
A flow path communicating with t ′ is formed.

44t ″ is the discharge-side check valve 13 shown in FIG.
b is a recess for forming a valve seat or the like, 44f is a check valve hole, 44f 'is a reed valve 61 shown in FIG.
This is a female screw hole for fixing the valve retainer 62 shown in FIG. 5B to the main bearing 44 with a bolt. Reed valve 61 here
Works as a check valve. That is, when the gas refrigerant pressure in the space of the recess 44t '' is higher than the gas refrigerant pressure in the hole 44f, the reed valve is in close contact with the valve seat, the valve is in a closed state, and the gas refrigerant in the space of the recess 44t '' is closed. Pressure is 44f
When the pressure is lower than the gas refrigerant pressure inside the reed valve, the reed valve floats from the valve seat and the valve is opened.

Reference numeral 44h partially forms the discharge passage 11b of the high-stage compression element 12 shown in FIG. 1, and the hole on the back side in the figure is connected to the high-stage compression element discharge pipe 12b 'in FIG.

Reference numeral 44u denotes two female screw holes for fixing the second cylinder 45 shown in FIG. 4 to the rear side of the figure with bolts. Reference numeral 44w denotes four female screw holes, and the second cylinder 45 and the partition plate 4 shown in FIG.
6, for fixing the first cylinder 47, the sub bearing 48, and the first discharge chamber cover 49 with bolts, two of which are on the front side in the drawing, the second discharge chamber sub cover 50, It is also used to fix the second discharge chamber main cover 51.

The second discharge chamber sub-cover 5 shown in FIG.
0, 50c is the pressure forming passage 1 in the closed container of FIG.
2c is a hole that partially forms the recess 2t 'of the main bearing 44,
44g 'communicates with the hole 44g. 50h is a convex part and the main bearing 4
4 together with a part of the discharge passage 12b of the high-stage compression element 12 of FIG. 1 to form a discharge chamber, and the discharge chamber 50h ′ is connected to a second discharge chamber sub-cover 50 and a second discharge chamber main cover to be described later. The hole communicates with another discharge chamber space formed by the cover 51. 50h '' forms a passage connecting the discharge passage 12b of the high-stage compression element 12 of FIG. 1 and the discharge-side check valve 13b,
50h ′ ″ is a hole that communicates a space formed by the second discharge chamber sub-cover 50 and a second discharge chamber main cover 51 described later with the hole 44h of the main bearing 44 described above.

Reference numeral 50w denotes two holes for bolting the main bearing 44 together with the second discharge chamber main cover 51.

The second discharge chamber main cover 5 shown in FIG.
In FIG. 1, reference numeral 51c denotes a convex portion, together with the second discharge chamber cover 50, which is a passage that forms the closed container internal pressure forming passage 12c of FIG. 1, and communicates with the inside of the closed container 40 of FIG. 3 through a hole 51c '. Reference numeral 51h denotes a convex portion, which is a second discharge chamber sub-cover 50.
A space is formed together with the space, and the cross-sectional area of the flow path connecting the holes 50h ′ ″ of the second discharge chamber sub-cover 50 changes to function as a muffler.

Reference numeral 51w denotes two holes for fixing the main discharge bearing together with the second discharge chamber sub-cover 50 to the main bearing 44 by bolts.

The structure of the gas refrigerant passage of the compressor 10 shown in FIG. 3 is summarized as follows. The suction passage 11a of the low-stage compression element 11 in FIG.
a ', a hole 49e, a hole 48e, and a notch 47e. A passage connecting the suction passage 11a and the suction-side check valve 13a in FIG. 1 is constituted by a hole 46e, a hole 45e, and a hole 44e. The discharge passage 11b has a concave portion 48t, a concave portion 48f.
(Space formed with the first discharge chamber cover 49),
It comprises a hole 49f, a low-stage compression element discharge pipe 11b ',
The passage connecting the discharge passage 11b and the discharge-side check valve 13b in FIG. 1 includes a hole 48f ′, a hole 47f, a hole 46f, a hole 45f,
It is composed of a hole 44f.

The suction passage 12a of the high-stage compression element 12 shown in FIG. 1 includes a high-stage compression element suction pipe 12a ', a hole 49g, a hole 48g, a hole 47g, a hole 46g, a concave portion and a notch 45g.
The suction-side check valve 13a and the suction passage 1 shown in FIG.
The passage connecting 2a includes a concave portion 44t '(a space formed together with the second discharge chamber sub-cover 50) and a concave portion 44g'.
(A space formed together with the second discharge chamber sub-cover 50), and a hole 44g.
Are a concave portion 44t (a space formed with the second discharge chamber sub-cover 50), a convex portion 50h (a space formed with the main bearing 44), a hole 50h ', and a convex portion 51h (the second discharge chamber sub-cover 50). Space formed with the
h ′ ″, a hole 44h, a high-stage compression element discharge pipe 12b ′, and the discharge-side check valve 13b and the discharge passage 12b in FIG.
Is constituted by a concave portion 44t '' and a hole 50h ''. The pressure forming passage 12c in the closed container in FIG.
A hole 50c, a convex portion 51c (a space formed with the second discharge chamber sub-cover 50), and a hole 51c 'communicate with the suction passage of the high-stage compression element and the closed container.
It works to keep the internal pressure at the suction gas pressure of the high-stage compression element.

FIG. 7 is a cross-sectional view of the compressor 10 shown in FIG.
It is a 2nd cylinder part of a cross section. In the drawing, reference numeral 44z denotes an end face of the main bearing 44 constituting an end face of the high-stage compression element;
Reference numeral 3 denotes an oil pocket (recess) provided in the end face portion 44, which alternates between the inside of the roller 52 and the working chamber. Inside the roller 52, lubricating oil supplied to the crankshaft 42 by an oil supply pump utilizing the reciprocating motion of the vane portion of the roller 53 described above is stored, and the oil pocket 63 activates the high-stage compression element. Supply oil intermittently to the chamber. The low-stage compression element also has a similar oil pocket (not shown) at the end face of the sub-bearing 48 to supply oil intermittently to the working chamber of the low-stage compression element.

In the refrigerator configured as described above,
An operation in which the refrigerator compartment 3 and the freezer compartment 2 are cooled in parallel (simultaneously) and an operation in which the freezer compartment is cooled independently are performed. The operation of the simultaneous (parallel) cooling operation of the freezer and the refrigerator compartment and the operation of the cooling operation of the freezer alone will be described below.

During the simultaneous cooling operation of the freezer compartment and the refrigerator compartment, both the first solenoid valve 23 and the second solenoid valve 26 are opened. Compressor 1
The low-stage compression element 11, the intercooler 27, the high-stage compression element 12, the condenser 20, the first capillary 21, and the freezer-room evaporator 22 form a freezer-room cooling refrigeration cycle and a compressor 10. High-stage compression element 12, condenser 20, second
The capillary 24 and the refrigerating room evaporator 25 form a refrigerating room cooling refrigerating cycle. The compressor 10 performs two-stage compression in which a low-stage compression element 11 and a high-stage compression element 12 are connected in series. In addition, the condenser fan 30 and the freezer evaporator fan 3
1. The refrigerator evaporator fan 32 is operated. At this time, in the suction-side check valve 13a, the gas refrigerant pressure in the suction passage 12a of the high-stage compression element 12 is higher than the gas refrigerant pressure in the suction passage 11a of the low-stage compression element 11.
The valve is closed. Also, the discharge-side check valve 13
Also in b, since the gas refrigerant pressure in the discharge passage 12b of the high-stage compression element 12 is higher than the gas refrigerant pressure in the discharge passage 11b of the low-stage compression element 11, the valve is in a closed state. .

At this time, the refrigerant evaporates at different temperatures, for example, the evaporator 22 for the freezer compartment has an evaporating temperature of -26 ° C. and the evaporator 25 for the refrigerating compartment has an evaporating temperature of −8 ° C. The cooling of the chamber 2 and the refrigerator compartment 3 is performed. At the branch of the outlet of the condenser 20, when the refrigerant is almost halved into the evaporator 22 for the freezer compartment and the evaporator 25 for the refrigerating compartment, the refrigerating compartment 2 and the refrigerating compartment 3 are cooled with substantially the same refrigerating capacity.

The low-stage compression element 11 of the compressor 10 converts the gas refrigerant from the freezer compartment evaporator 22 from the low pressure of the evaporation pressure level of the freezer compartment evaporator 22 (the minimum pressure of the refrigeration cycle).
The high-stage compression element 12 compresses the gas refrigerant compressed to the intermediate pressure by the low-stage compression element 11 and cooled by the intermediate cooler 27 to the intermediate pressure of the evaporating pressure level of the refrigerator compartment evaporator 25. Together with the gas refrigerant from the evaporator 25 for
The compression is performed from the intermediate pressure to a high pressure (the maximum pressure of the refrigeration cycle) of the condensation pressure level of the condenser 13.

The displacements of the low-stage compression element 11 and the high-stage compression element 12 are set to be equal or almost equal, for the following reason. For example, when R134a or R600a is used as the refrigerant, the evaporating pressure of the refrigerator compartment evaporator 25 is higher than the evaporating pressure of the freezer compartment evaporator 22, and the high-stage compression element 12 has a lower suction gas specific volume than the low-stage compression element 11. When the refrigerating compartment and the refrigerating compartment require substantially the same refrigerating capacity, the refrigerant mass flow rate of the high-stage compression element 12 is equal to the refrigerant mass flow rate of the low-stage compression capacity 11. This is because it is about twice, and the refrigerant volume flow rates of the suction gas of the compression elements 11 and 12 are almost the same. The actual displacement is set based on the required refrigerating capacity of the freezing compartment and the refrigerating compartment, predetermined suction gas pressures of the compression elements 11 and 12, temperature conditions, and the like. Two compression elements 1
When the displacements of the parts 1 and 12 are the same, some parts can be shared, the number of parts is reduced, and the cost can be reduced.

The internal pressure of the sealed container 40 of the compressor 10 is the high-stage compression element suction gas pressure, that is, the intermediate pressure (evaporation pressure level of the refrigerator compartment evaporator 25). FIG. 8 shows the pressure difference between the pressure in the compression chamber and the pressure in the closed vessel during one rotation of the low-stage compression element and the high-stage compression element when the compressor 10 performs two-stage compression. ) Intermediate pressure sealed container,
(C) A case of a low-pressure closed container will be described. The rotation angle of 0 ° is the crank rotation angle at the start of compression in each of the low-stage compression element and the high-stage compression element. The solid line indicates the pressure in the compression chamber, the dashed line indicates the pressure in the closed vessel, and the oblique line indicates the pressure difference. The condition here is that the refrigerant R134a, the evaporation temperature of the freezer evaporator -2
The temperature is 6 ° C., the evaporation temperature of the refrigerator evaporator is −8 ° C., and the condensation temperature of the condenser is 33 ° C. As shown in the figure, (b) the case of the intermediate-pressure closed vessel has a small pressure difference per rotation, which is effective in reducing the amount of leaked gas due to the pressure difference in the compression process, and improves the efficiency of the two-stage compression of the compressor. Can be done.

Working chamber (suction chamber, compression chamber) for low-stage compression element
For the oil supply into the working chamber for sealing, the oil leaking into the working chamber due to the pressure difference between the closed container and the working chamber and the above-mentioned auxiliary bearing 4
This is carried out by the oil pocket provided in 8 and the oil contained in the suction gas. Further, the oil supply into the working chamber for sealing the working chamber of the high-stage compression element is performed by the oil contained in the oil pocket 63 provided in the main bearing 44 and the suction gas.

The intercooler 27 serves to cool the discharge gas of the low-stage compression element and reduce the temperature of the intake gas of the high-stage compression element. Work is reduced, and compression power can be reduced.

During the freezing operation of the freezing compartment, both the first solenoid valve 23 and the second solenoid valve 26 are closed. Since the solenoid valve 23 is closed, the flow of the refrigerant to the refrigerator compartment evaporator 25 is blocked, and the refrigerant flows only to the freezer compartment evaporator 22.

At this time, the low-stage compression element 11 of the compressor 10
Sucks the gas refrigerant at the outlet of the freezer evaporator 22 and performs a compression action. Since one of the passages connected to the discharge passage 11b of the low-stage compression element 11 is closed on one side of the solenoid valve 26, the discharge passage of the high-stage compression element 12 on the opposite side of the other discharge-side check valve 13b. The gas refrigerant in the low stage compression element 12 is compressed to a pressure higher than the gas refrigerant pressure in 12b and passes through the check valve 13b. On the other hand, the electromagnetic valves 23 and 26 are closed, and the evaporator 25 for the refrigerator compartment communicating with the suction passage 12a,
Since no refrigerant is supplied to the intercooler 27, the gas refrigerant pressure in the suction passage 12a of the high-stage compression element 12 gradually decreases due to the suction action of the high-stage compression element 12, and the suction passage 11a of the low-stage compression element 11 Is reduced below the gas refrigerant pressure. As a result, the suction-side check valve 13a is opened, and the gas refrigerant on the suction passage 11a side of the low-stage compression element 11 flows into the suction passage 12a side of the high-stage compression element 12.

The evaporator 25 for the refrigerator compartment, the intercooler 2
The gas refrigerant pressure at 7 is the same as the gas refrigerant pressure in the suction passage 12a, which is the evaporation pressure level of the freezing room evaporator 22, but the temperature of the refrigerator room evaporator 25 is the air temperature in the refrigerator room 3. And the temperature of the intercooler 27 becomes substantially equal to the air temperature at the bottom of the refrigerator main body 1 and becomes higher than the evaporation temperature of the freezer evaporator 22. Therefore, it is possible to prevent a problem that the gas refrigerant in the suction passage 12a is condensed and stays in the refrigerating room evaporator 25 and the intercooler 27. Also,
The valve 23 is disposed between the evaporator and a branch of a refrigerant pipe provided between the evaporator and the condenser. The valve 26 is disposed between the intercooler 27 and the discharge passage 11b of the compression element 11. By doing so, when performing the cooling operation of the storage room alone, the amount of the refrigerant remaining in the evaporator 25 or the cooler 27 can be reduced, and the operation efficiency can be kept high.

At this time, the two compression elements 11 and 12 respectively perform the compression action in parallel from the evaporation pressure level of the freezer evaporator 22 to the condensation pressure level of the condenser 20.
Therefore, the two compression elements 11, 12,
Condenser 20, first capillary 21, freezer evaporator 2
A freezing cycle consisting of two freezer compartments is formed. Further, the condenser fan 30 and the freezer compartment evaporator fan 31 are operated, and the refrigerator compartment evaporator fan 32 is stopped. Thereby, only the freezing compartment 2 is cooled.

At this time, the pressure in the closed vessel 40 of the compressor 10 is a high-stage compression element suction gas pressure, that is, a low pressure (evaporation pressure level of the freezer evaporator 22). FIG.
The pressure difference between the pressure in the compression chamber and the pressure in the closed vessel during one revolution of the compression element when the compressor 10 performs single-stage compression is shown in (a) the high-pressure closed vessel and (b) the low-pressure closed vessel.
The solid line indicates the pressure in the compression chamber, the dashed line indicates the pressure in the closed vessel, and the oblique line indicates the pressure difference. The conditions here are as follows: the refrigerant R134a, the evaporation temperature of the freezer evaporator −26 ° C., and the condensation temperature of the condenser 32
° C. From the figure, (b) the case of the low-pressure closed container is
The pressure difference per rotation is small, which is effective in reducing the amount of leaked gas due to the pressure difference in the compression process, and can improve the efficiency of single-stage compression of the compressor.

The oil supply to the working chamber for sealing the working chambers (suction chamber, compression chamber) of the two compression elements is performed by the oil pocket and suction gas provided in the sub bearing 48 and the main bearing 44, respectively. It is performed by the contained oil.

In Japanese Patent Publication No. 4-54152, a two-cylinder rotary compressor having two compression chambers in a closed container is provided, and is provided on a refrigerant passage communicating with a compression chamber (compression element) of the compressor. A valve is provided to switch the flow of the refrigerant to each compression chamber in parallel / series.

That is, in this prior art, the suction pipe of one compression chamber (compression element for low pressure) and the suction pipe of the other compression chamber (compression element for high pressure) are connected via a check valve, The discharge pipe of the compression element for use is opened in the closed vessel, and one of the discharge pipes of the compression element for low pressure that is bifurcated is communicated with the inside of the closed vessel via a check valve, and the other is provided with a switching solenoid valve. It is connected to the suction pipe of the high-pressure compression element through the connection. And
The switching solenoid valve is actuated according to the required capacity and efficiency that varies depending on the operating conditions, and the single-stage compression operation in which the refrigerant is compressed once by flowing the refrigerant in parallel to the two compression elements; The operation is switched between a two-stage compression operation in which the refrigerant flows in series in the element and is compressed twice by each compression element, so as to exert more appropriate performance under a wide range of operating conditions.

In this prior art compressor, the pressure in the container is equal to the pressure of the refrigerant discharged from the high-pressure compression element, and as in this embodiment, the pressure is changed from the low pressure to the intermediate pressure. Yes. In the present embodiment, with the above configuration, when each storage room is cooled by a plurality of coolers, a more appropriate operation is selected to improve the cooling and operation efficiency of the refrigerator. Another object of the present invention is to improve the efficiency by solving the problem of the flow of the refrigerant that occurs when switching the flow of the refrigerant flowing through the compression element of the compressor.

Further, with such a configuration, when a hydrocarbon-based refrigerant, which is a flammable refrigerant, is used as the refrigerant, the amount of the refrigerant dissolved into the lubricating oil is reduced, and the entire refrigerant used in the refrigeration cycle of the refrigerator is reduced. Since the amount is reduced, the possibility of an accident such as ignition due to leakage of the flammable refrigerant is reduced.

FIG. 10 shows a control flowchart of the simultaneous freezing operation of the freezer compartment and the freezing compartment in the refrigerator.
The following processing is performed by the control device 101.

If the operation switch of the refrigerator is ON (30
0Y), the refrigerating room temperature sensor 9 detects the refrigerating room temperature Tr (301), and the refrigerating room temperature Tr becomes the refrigerating room cooling start temperature T.
It is determined whether it is equal to or greater than rs (302). Refrigerator temperature Tr
Is equal to or higher than the refrigerator compartment cooling start temperature Trs (302Y),
Condenser fan 30, freezer compartment fan 31, refrigerator compartment fan 3
2. The operation of the compressor 10 is started (303), and the simultaneous cooling operation of the freezer and the refrigerator is performed.

A timer is started (304), and after a lapse of a predetermined time (305Y), the refrigerating compartment temperature sensor 9 detects the refrigerating compartment temperature Tr (306) to determine whether or not the refrigerating compartment temperature Tr is lower than the refrigerating compartment cooling end temperature Tre. Judgment (30
7). If the temperature is not lower than the refrigerator compartment cooling end temperature Tre (30
7N), the process returns to step 304, and the simultaneous freezing room cooling room cooling operation is continued until the refrigerator room temperature Tr becomes equal to or lower than the refrigerator room cooling end temperature Tre.

The refrigerator compartment temperature Tr is equal to the refrigerator compartment cooling end temperature Tr.
e (307Y), the freezing room temperature sensor 8 detects the freezing room temperature Tf (308). If the freezing room temperature Tf is lower than the freezing room cooling end temperature Tfe (309Y), the compressor 10, the condenser fan 30, the operation of the freezer compartment fan 31 and the refrigerating compartment fan 32 is stopped, and the simultaneous freezing compartment refrigerating compartment cooling operation is terminated (310).

The timer is started (311), and after a predetermined time has elapsed (312), the process returns to step 300. In step 302, the refrigerator compartment temperature Tr becomes the refrigerator compartment cooling start temperature Tr.
s (302N), then the freezer compartment temperature sensor 8
The freezer compartment temperature Tf is detected (320).
It is determined whether or not f is equal to or higher than the freezing compartment cooling start temperature Tfs (321). If it is lower than the freezing compartment cooling start temperature Tfs (3
21N), proceed to step 311 and return to step 300.

The freezing room temperature Tf is equal to the freezing room cooling start temperature Tf.
s or more (321Y), the solenoid valves 23, 2
6 is closed, the operation of the condenser fan 30, the freezing room fan 31, and the compressor 10 is started (322), and the freezing room alone cooling operation is performed.

A timer is started (323), and after a lapse of a predetermined time (324Y), the refrigerator compartment temperature sensor 9 detects the refrigerator compartment temperature Tr (325), and determines whether or not the refrigerator compartment temperature Tr is equal to or higher than the refrigerator compartment cooling start temperature Trs. Judgment (32
6). If the temperature is equal to or higher than the refrigerator compartment cooling start temperature Trs (326)
Y), the operation of the refrigerator compartment fan 32 is started, and the solenoid valve 23,
The energization to 26 is stopped, the valve is opened (340), and the freezing room independent cooling operation is shifted to the freezing room cooling room simultaneous cooling operation.

The refrigerator compartment temperature Tr is equal to the refrigerator compartment cooling start temperature Tr.
If it is less than s (326N), the freezing room temperature sensor 8 detects the freezing room temperature Tf (327), and determines whether the freezing room temperature Tf is equal to or lower than the freezing room cooling end temperature Tfe (32).
8). If the freezing room temperature Tf is higher than the freezing room cooling end temperature Tfe (328N), the process returns to step 323, and the freezing room independent cooling operation is continued. If it is lower than the freezing compartment cooling end temperature Tfe (328Y), the compressor 10, the condenser fan 30,
The operation of the freezer compartment fan 31 is stopped, the power supply to the solenoid valves 23 and 26 is stopped, the valves are opened, the freezing compartment independent cooling operation is terminated, the process proceeds to step 311 and returns to step 300.

In step 309, the freezing room temperature Tf
Is higher than the freezing compartment cooling end temperature Tfe (309
N), the solenoid valves 23 and 26 are energized, the valves are closed, the operation of the refrigerator compartment fan 32 is stopped, the freezing compartment cooling compartment simultaneous cooling operation is shifted to the freezing compartment single cooling operation, and the routine proceeds to step 323.

By controlling the configuration and operation of the above-described embodiment, it is not necessary to heat the refrigerator to prevent freezing of the food in the refrigerator. The temperature of the refrigerator is, for example, −18 ° C. or less, and the temperature of the refrigerator is, for example, 0 ° C. The temperature can be set to 5 ° C. or less, which is higher, and the temperatures of the freezing compartment and the refrigerator compartment can be appropriately maintained.

During the parallel cooling operation of the freezer compartment and the refrigerator compartment, the gas refrigerant from the refrigerator compartment evaporator 25 is further reduced in pressure to the evaporation pressure level of the freezer compartment evaporator 22.
Since the compression is performed not from the low pressure but from the intermediate pressure of the evaporating pressure level of the refrigerator compartment evaporator, the compression power can be reduced, and the power consumption of the refrigerator can be greatly reduced.

Further, the compressor has two compression elements,
During the parallel cooling operation of the freezing compartment and the refrigerating compartment, two stages of compression control are performed, so the pressure difference between the compression compartment and the suction compartment of each compression element becomes small, which is effective in reducing the amount of leaked gas in the compression process. In addition, the efficiency of the compressor is improved, and the efficiency of the refrigerator can be improved.

Further, since the two compression elements of the compressor are configured to be compressed in parallel during the freezing operation of the freezing compartment alone, the displacement for the freezing compartment is reduced during the simultaneous cooling operation of the freezing compartment. It is doubled, and the freezing room refrigeration capacity can be increased.

A refrigerator having an evaporator in each of a freezer compartment and a refrigerator compartment has a single evaporator, and has a smaller evaporator for the refrigerator compartment than a refrigerator in which both the refrigerator compartment and the refrigerator compartment are cooled by forced circulation of cool air. Since the evaporating temperature of the vessel can be increased, the temperature of cold air discharged into the refrigerator can be increased, and the humidity can be kept high, so that the preservation state of the food in the refrigerator can be improved.

Further, since the amount of frost formed on the evaporator for the refrigerator compartment also decreases, the cycle of defrosting by the electric heater is extended, which is effective in reducing power consumption.

Further, since the cold air in the freezing room and the cold room are completely separated, the odor can be prevented from being transferred between the freezing room and the cold room.

Further, since an opening communicating the suction passage of the compression element and the inside of the closed vessel of the compressor is provided, the pressure in the closed vessel becomes low during single-stage compression of the compressor, and the pressure becomes low during two-stage compression. The pressure in the container becomes an intermediate pressure. For this reason, the pressure difference between the compression chamber and the pressure in the closed vessel per rotation is small, which is effective in reducing the amount of leaked gas due to the pressure difference in the compression process, and can improve the efficiency of the compressor.

Further, since the pressure in the closed vessel of the compressor is set to a low pressure or an intermediate pressure, the amount of the refrigerant dissolved in the lubricating oil can be reduced, and it is easy to cope with the hydrocarbon-based refrigerant which is a flammable refrigerant.

Further, since the check valve is arranged in the closed vessel, the piping around the compressor can be made compact.

Since the two solenoid valves 23 and 26 perform the same opening and closing operations,
The energization and non-energization of the individual solenoid valves can be made into one circuit, and the cost can be reduced.

Embodiment 2 A second embodiment of the present invention will be described with reference to FIGS.

FIG. 11 is a configuration diagram of a refrigeration cycle of a refrigerator according to the second embodiment, and FIG. 12 is a table showing opening and closing operations of a solenoid valve of the refrigeration cycle of FIG. At the same time, the operation of the refrigerator according to the first embodiment is also shown. 11, the same reference numerals are given to the same parts as those in FIG. 1, and the description thereof will be omitted.

In FIG. 11, a compressor 10 'has two compression elements (low-stage compression element 11,
It has a high-stage compression element 12). 70a and 70b are solenoid valves provided on the inlet side and outlet side of the freezer evaporator 22, respectively, and 71a and 71b are compression elements 11 and 1 respectively.
2, the suction passages 11a and 12a, and the discharge passages 11b and 12
This is a solenoid valve provided on the b side. 6 solenoid valves 23, 2
6, 70a, 70b, 71a, and 71b are combined to open and close to simultaneously cool the freezing room and the refrigerating room, individually cool the freezing room, and independently cool the refrigerating room.

In the refrigeration cycle of the refrigerator configured as described above, the operation of the simultaneous cooling operation of the freezer compartment, the freezing operation of the freezer compartment, and the operation of the freezer compartment alone cooling will be described.

In the simultaneous cooling operation of the freezer compartment and the refrigerator compartment, the operation shown in FIG.
As shown in (2), the solenoid valves 23, 26, 70a, 70b are opened, and the solenoid valves 71a, 70b are closed. At this time, the compressor 1
The 0 'low-stage compression element 11, the intercooler 27, the high-stage compression element 12, the condenser 20, the first capillary 21, and the freezer-room evaporator 22 form a freezer-room cooling / refrigeration cycle and a compressor. 10 'high stage compression element 12, condenser 20,
The second capillary 24 and the refrigerating compartment evaporator 25 form a refrigerating compartment cooling refrigerating cycle. The compressor 10 'performs two-stage compression in which a low-stage compression element 11 and a high-stage compression element 12 are connected in series. Also, the condenser fan 30, the freezer compartment evaporator fan 31, and the refrigerator compartment evaporator fan 32 are operated.

The low-stage compression element 11 of the compressor 10 'converts the gas refrigerant from the freezer compartment evaporator 22 from the low pressure of the evaporation pressure level of the freezer compartment evaporator 22 (minimum pressure of the refrigeration cycle) to the refrigerator compartment. The high-stage compression element 12 compresses the gas refrigerant compressed to the intermediate pressure by the low-stage compression element 11 and is cooled by the intermediate cooler 27 to the intermediate pressure of the evaporation pressure level of the evaporator 25. With the gas refrigerant from 25, the gas is compressed from the intermediate pressure to a high pressure (the maximum pressure of the refrigeration cycle) of the condensation pressure level of the condenser 13.

By the above operation, the simultaneous cooling operation of the freezing room and the refrigerating room is performed.

In the freezing room independent cooling operation, as shown in FIG. 12, the solenoid valves 70a, 70b, 71a, 71b are opened, and the solenoid valves 23, 26 are closed. At this time, the two compression elements 11 and 12 are connected in parallel. Since the electromagnetic valve 70a is opened and the electromagnetic valve 23 is closed, the refrigerant is supplied to the freezer evaporator 22, and the refrigerant is not supplied to the refrigerator evaporator 25. Since the solenoid valves 23 and 26 are closed and the refrigerant is not supplied to the evaporator 25 for the refrigerator compartment and the intercooler 27 that communicate with the suction passage 12a of the high-stage compression element 12,
The high-stage compression element 12 passes through an open solenoid valve 71a.
The gas refrigerant from the freezer evaporator 22 is sucked and compressed.
Further, since the solenoid valve 26 is closed, the low-stage compression element 11
Discharge gas passes through the open electromagnetic valve 71 b, merges with the discharge gas of the high-stage compression element 12, and enters the condenser 20. Therefore, a freezing room independent cooling refrigeration cycle including the two compression elements 11 and 12, the condenser 20, the first capillary 21, and the freezing room evaporator 22 is formed. Also, condenser fan 3
0, the freezer compartment evaporator fan 31 is operated, and the refrigerator compartment evaporator fan 32 is stopped. As a result, an independent cooling operation of the freezing room is performed.

In the cooling operation of the refrigerator compartment alone, FIG.
As shown in (2), the solenoid valves 23, 71a, 71b are opened, and the solenoid valves 26, 70a, 70b are closed. At this time, the two compression elements 11 and 12 are connected in parallel. Since the electromagnetic valve 23 is opened and the electromagnetic valve 70a is closed, the refrigerant is supplied to the refrigerator compartment evaporator 25 and the refrigerant is not supplied to the freezer compartment evaporator 22. Because the solenoid valve 70b is closed,
The low-stage compression element 11 passes through an open solenoid valve 71a.
The gas refrigerant from the refrigerator compartment evaporator 25 is sucked and compressed.
Further, since the solenoid valve 26 is closed, the low-stage compression element 11
Discharge gas passes through the open electromagnetic valve 71 b, merges with the discharge gas of the high-stage compression element 12, and enters the condenser 20. Therefore, a refrigerator-only cooling refrigeration cycle including the two compression elements 11 and 12, the condenser 20, the second capillary 24, and the refrigerator evaporator 25 is formed. Also, condenser fan 3
0, the refrigerator compartment evaporator fan 32 is operated, and the freezer compartment evaporator fan 31 is stopped. As a result, a single cooling operation of the refrigerator compartment is performed.

The pressure of the gas refrigerant in the intercooler 27 is the same as the pressure of the gas refrigerant in the suction passage 12a.
Is substantially equal to the air temperature at the bottom of the refrigerator main body 1 and is higher than the evaporating temperature of the refrigerator compartment evaporator 25. Therefore, it is possible to prevent the problem that the gas refrigerant is condensed and stays in the intercooler 27. Also, the solenoid valves 70a, 70b
Is closed, the problem that the gas refrigerant circulating in the refrigeration cycle is cooled by the freezer compartment evaporator 22, condensed, and stays can be prevented.

In this embodiment, the simultaneous (parallel) cooling operation of the freezer and the refrigerator compartment, the cooling operation of the freezer compartment alone, and the cooling operation of the refrigerator compartment alone can be switched. Therefore, as in the first embodiment, Eliminates the need for heater heating to prevent freezing of food in the refrigerator compartment. For example, the freezer compartment temperature can be -18 ° C or lower, and the refrigerator compartment temperature can be 5 ° C or lower, which is higher than 0 ° C. Can be properly maintained.

Further, as compared with the first embodiment, a single cooling operation of the refrigerator compartment is also possible, so that when only the refrigerator compartment needs to be cooled, the freezer compartment is also cooled as in the first embodiment. Instead, since only the refrigerator compartment can be cooled, excess cooling of the freezer compartment can be prevented.

In the simultaneous cooling operation of the freezer and refrigerator,
The gas refrigerant from the refrigerator compartment evaporator is further reduced to a low pressure of the evaporation pressure level of the freezer compartment evaporator, and is not compressed from the low pressure, but is compressed from the intermediate pressure of the refrigerator compartment evaporator. Therefore, the compression power can be reduced, and the power consumption of the refrigerator can be significantly reduced.

Further, the compressor has two compression elements,
During the simultaneous cooling operation of the freezer and refrigerator, the two-stage compression control is performed, so that the pressure difference between the compression chamber and the suction chamber of each compression element is reduced, which is effective in reducing the amount of leaked gas in the compression process. The efficiency of the refrigerator can be improved, and the efficiency of the refrigerator can be improved.

Furthermore, in the freezing room (or refrigeration room) single cooling operation, since the two compression elements of the compressor are configured to be compressed in parallel, the displacement for freezing room (or refrigeration room) cooling is reduced. This is twice (or four times) that of the simultaneous cooling operation of the freezing compartment and the freezing compartment, and the freezing capacity of the freezing compartment (or the refrigerating compartment) can be increased.

The refrigerator having the evaporator in the freezer compartment and the refrigerator compartment has a single evaporator, and has a smaller evaporator for the refrigerator compartment than the refrigerator in which both the freezer compartment and the refrigerator compartment are cooled by forced circulation of cool air. Since the evaporating temperature of the vessel can be increased, the temperature of cold air discharged into the refrigerator can be increased, and the humidity can be kept high, so that the preservation state of the food in the refrigerator can be improved.

Further, since the amount of frost formed on the evaporator for the refrigerator compartment also decreases, the cycle of defrosting by the electric heater is extended, which is effective in reducing power consumption.

Further, since the cold air in the freezing room and the cold room are completely separated, the odor can be prevented from being transferred between the freezing room and the cold room.

[Embodiment 3] A third embodiment of the present invention will be described with reference to FIGS.

FIG. 13 is a perspective view of a refrigerator schematically showing a refrigerating cycle of the refrigerator according to the third embodiment of the present invention, and is a perspective view showing the internal structure thereof. FIG. 14 is a longitudinal sectional view schematically showing the structure of the refrigerator shown in FIG.
FIG. 15 is a schematic view of a panel provided in the refrigerator shown in FIG. 13 for operating the refrigerator. FIG. 16 is a table showing the opening / closing operation of the solenoid valve of the refrigeration cycle of the refrigerator shown in FIG. 17 to 20 are flowcharts showing a control flow of the operation of the refrigerator shown in FIG.

In FIGS. 13 and 14, the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof will be omitted. The refrigeration cycle configuration of the present embodiment is equivalent to the refrigeration cycle configuration of the first embodiment shown in FIG. 1, and when referring to FIG.
Reference numeral 10 is set to 10 ″.

The difference between the refrigerator shown in this embodiment and the refrigerator in the embodiment shown in FIG.
A refrigerator compartment evaporator 25 and a refrigerator compartment fan 32 are arranged behind the vegetable compartment 3B arranged below A, and a wall behind the refrigerator in the refrigerator compartment 3A is driven by the fan 32. A cool air passage through which air cooled by the cooler 25 supplied to the refrigerator compartment 3A flows, and an opening through which the cool air flows into a space defined by a shelf provided in the refrigerator compartment 3A from the passage. That is the point. An operation panel that can be operated by a user is provided on a door disposed on the front side of the refrigerator of the refrigerator compartment 3A, and the operation of the operation panel allows the user to adjust the operation of the refrigerator and perform a desired operation. Can be performed.

[0130] Below the vegetable compartment 3B, a heat insulating partition wall provided with a heat insulating material for vertically dividing the inside of the refrigerator is arranged.
A freezing compartment 2 is provided below the heat insulating partition wall. This freezer compartment is vertically divided into a plurality of compartments, and containers 2A and 2B each having an open top are arranged in each compartment, and are moved in the front-rear direction of the refrigerator on the front surface thereof. A plurality of doors for opening and closing the room are provided. The container moves in the front-rear direction of the refrigerator as the doors open and close.

An evaporator 22 for the freezer compartment and a fan 31 for the freezer compartment are arranged behind the freezer compartment 2 divided into a plurality of compartments, and are cooled by the evaporator 22 by driving the freezer compartment fan. Air is supplied into the freezer 2. In this embodiment, the supplied cold air is supplied so as to flow into the container from above the containers 2A and 2B, and flows from the inside of the container to the outside of the container, or directly flows to the outside of the container to flow into the container and the inside of the container. Is cooled, flows toward the evaporator 22 from the return port of the cool air provided behind the container 2B, and is cooled again by the evaporator 22.

In FIG. 13, the compressor 10 ″ has two compression elements, a low-stage compression element (first compression element) and a high-stage compression element (second compression element), similarly to the compressor 10 shown in FIG. And two check valves are arranged in a closed container 40 ''. The discharge pipe 12b '' of the high-stage compression element is
Unlike the compressor 10 shown in FIG. 3, the compressor 10 is provided so as to extend from the side surface of the closed container 40 ″ to the outside of the container. As a result, the high-temperature discharge gas is supplied to the closed container 4 as soon as possible.
0 ", the influence of heating on gas having a lower temperature than the discharge gas is reduced, and the tubes 11a ', 11
By separating them from b ′ and 12a ′, the space necessary for the work of welding these pipes is secured and the work is facilitated.

In this figure, 20A is a condenser,
For example, a structure is provided in which fins are provided on the refrigerant pipe by insertion, winding, or the like, and is provided at the bottom on the back side of the refrigerator main body 1 'and accommodates the condenser 20A together with the compressor 10''and the intercooler 27. It is located in the machine room, which is a space. Reference numeral 20B denotes a pipe connected to the refrigerant pipe of the condenser, which is provided so as to be in contact with and in close contact with a steel plate which is an outer plate forming a side surface, a back surface, and the like of the refrigerator main body 1 '.
Thus, the refrigerant flowing in the pipe 20B can exchange heat with an external space via the outer plate (steel plate) to release heat.

As described above, the intercooler 27 is disposed in the machine room. In this embodiment, the same finned pipe as the condenser 20A is used, and the condenser 20A and the intercooler 27 are integrated heat exchangers. It is composed and arranged together. As a result, the cost of the refrigerator can be reduced, and the size of the machine room can be reduced, and a large storage room in the refrigerator can be secured.

As described above, in FIG. 14, the refrigerator 1 '
Means two freezer compartments (2A, 2B), refrigerator compartment 3A, vegetable compartment 3
It has B. 80, 81 are freezer evaporators 22,
This is a temperature sensor for detecting the surface temperature of the refrigerator evaporator 25. 101 'is a control device of the refrigerator of the present embodiment. Reference numeral 106 'denotes an operation panel provided on the door of the refrigerator compartment 3A.

In the refrigerator of this embodiment, similarly to the refrigerator shown in FIG. 3, the control device 101 'comprises a temperature sensor 8 for the freezer compartment and a temperature sensor 9 for the refrigerator compartment (the temperature sensor for the vegetable compartment is shown in the drawing). However, signals from the temperature sensor 80 of the freezer compartment evaporator 22, the temperature sensor 81 of the refrigerator compartment evaporator, and the like are input, and based on these signals, the compressors 10 ″, The operation of the fans 30, 31, 31, the evaporator heaters 6, 7, and the solenoid valves 23, 26 is adjusted.

In FIG. 15, the operation panel 106 ′
Quick cooling button 90, quick freezing button 91, cold room temperature setting button 92, freezing room temperature setting button 93, LEDs 90a, 91 indicating the operating state of quick cooling and quick freezing.
a, LEDs 92a and 93a indicating a set temperature, a detected temperature, or a difference therebetween. By operating these buttons, the user can instruct the refrigerator to perform a desired operation.

In this embodiment, by operating the above button on the operation panel 106 or directly operating the LED, the temperature of the refrigerator compartment and the temperature of the freezer compartment can be selected according to the setting of strong, medium, and weak cooling, respectively. When the setting of cooling is selected, the temperature at which cooling is started and the temperature at which cooling is ended are set for each of the refrigerator compartment 3A or the freezer compartments 2A and 2B corresponding to the selected strong, medium, or weak. . In this embodiment, the temperature at which the cooling is completed is set to be higher in the order of strong, medium, and weak. On the basis of the set temperature and the signals detected and output by the sensors 8 and 9, the control device 1
01 'determines and adjusts the operation and operation of the refrigerator.

As shown in FIG. 16, in the refrigerator having the above-described configuration, the parallel cooling operation A of the freezing room and the refrigerator compartment and the parallel cooling operation B of the freezing room and the refrigerator room are performed by adjusting the opening and closing of the solenoid valves 23 and 26. The operation is performed in three operation modes, that is, the cooling operation of the freezing room alone. In this embodiment, R134 is used as the refrigerant.
a or R600a, the evaporation temperature of the freezer compartment evaporator 22 is -26 ° C, and the evaporation temperature of the refrigerator compartment evaporator 25 is -8.
° C, in the operation of the refrigerator and the refrigeration cycle in which the solenoid valves 23 and 26 are both opened in the first operation mode from the relation of the specific volume of the refrigerant gas, the freezer compartments 2A and 2A are operated.
The ratio of the refrigerating capacity of B to the refrigerating capacity of refrigerating room 3A is about 1: 1.

Further, the solenoid valve 23 in the second operation mode
Is opened, the solenoid valve 26 is closed, and the refrigerator and the refrigeration cycle are operating, the ratio of the refrigerating capacity of the freezing compartments 2A and 2B to the refrigerating capacity of the refrigerating compartment 3A is about 1: 2. In these first and second operation modes, the refrigerating compartment 3A and the freezing compartment 2
A and 2B are cooled in parallel (simultaneously). These first and second operation modes include the refrigerator compartment 3A and the freezer compartment 2A,
This is an operation in which the refrigerating room and the freezing room are cooled simultaneously (in parallel) by making the ratio of the magnitude of the cooling capacity necessary for 2B different.

Further, in the third operation mode, the solenoid valve 2
In the cooling operation of the freezing room alone performed in a state in which both the cooling rooms 3 and 26 are closed, only the freezing room is cooled, and the cooling room is not cooled.

The parallel cooling operation A of the freezing room and the refrigerating room is the same as the simultaneous (parallel) cooling operation of the freezing room and the refrigerating room described in the first embodiment. The cooling operation of the freezing room alone is the same as the cooling operation of the freezing room described in the first embodiment. Therefore, in the third embodiment, compared to the first embodiment, the refrigerating room freezing capacity is about 2 times lower than the freezing room refrigerating capacity.
By adding the double operation mode, it becomes possible to operate in accordance with the refrigerator compartment load and the refrigerator compartment load of the refrigerator,
It is possible to respond more finely to the demands of the user, and it is possible to suppress unnecessary cooling and improve cooling efficiency, thereby reducing power consumption.

The simultaneous cooling operation A of the freezer compartment and the refrigerator compartment and the cooling operation of the freezer compartment alone have been described in detail in the first embodiment, and therefore are omitted here. , 13, 14 and 16,
This will be described below.

In the parallel cooling operation B of the freezer compartment and the refrigerator compartment,
Since the solenoid valve 23 is open, the evaporator 22
The refrigerant is supplied to and flows through both the evaporator 25 and the refrigerator compartment evaporator 25. First compression element (low-stage compression element) of compressor 10 ″
Numeral 11 sucks the gas refrigerant at the outlet of the freezer evaporator 22 and performs compression. However, since the solenoid valve 26 is closed,
No refrigerant flows into the intercooler 27, and the discharge-side check valve 13b
The gas refrigerant in the first compression element 11 is compressed to a pressure higher than the gas refrigerant pressure in the discharge passage 12b of the second compression element (high-stage compression element) 12 on the opposite side, and passes through the check valve 13b. . On the other hand, the high-stage compression element 12 is an evaporator 25 for a refrigerator.
The gas refrigerant at the outlet is sucked and compressed. At this time, since the evaporating pressure of the refrigerating room evaporator 25 is higher than the evaporating pressure of the freezing room evaporator 22, the check valve 13a is closed.

That is, the low-stage compression element 11 of the compressor 10 ″ converts the gas refrigerant from the freezer compartment evaporator 22 from the low evaporation pressure level of the freezer compartment evaporator 22 to the condensation pressure level of the condenser 13. To form a refrigeration cycle for cooling the freezer together with the condenser 20, the first capillary 21, and the freezer evaporator 22. On the other hand, the high-stage compression element 12 compresses the gas refrigerant from the refrigerator compartment evaporator 25 from the intermediate pressure at the evaporation level of the refrigerator compartment evaporator 22 to the high pressure at the condensation pressure level of the condenser 13. , The second capillary 24 and the refrigerator evaporator 22 form a refrigeration cycle for cooling the refrigerator. At this time, the compressor 1
The pressure in the sealed container 40 of 0 ″ is an intermediate pressure which is the pressure of the suction gas of the high-stage compression element 12.

At this time, the condenser fan 30, the freezer compartment fan 31, and the refrigerator compartment fan 32 are operated. In this operation, the gas refrigerant from the refrigerator compartment evaporator 25 is further reduced to a low pressure of the evaporation pressure level of the freezer compartment evaporator 22 and is not compressed from the low pressure. Since the compression is performed from the intermediate pressure at the level, the compression power can be reduced, and the power consumption of the refrigerator during the main operation can be significantly reduced.

The temperature of the intercooler 27 is substantially equal to the air temperature at the bottom of the refrigerator main body, and
Gas refrigerant is higher than the evaporation temperature of the intercooler 2
There is no problem of condensing and staying in 7.

At this time, for example, if R134a or R600a is used as the refrigerant and the freezing compartment evaporation temperature is -26 ° C. and the refrigerating compartment evaporation temperature is -8 ° C., the displacements of the low stage compression element 11 and the high stage compression element 12 are equal. Or approximately the same, the specific volume of the intake gas of the high-stage compression element 12 is substantially half of the specific volume of the intake gas of the low-stage compression element 11. And the ratio of the freezing room freezing capacity to the refrigerating room freezing capacity is about 1: 2.

Next, a control flowchart in this embodiment will be described with reference to FIGS. The following processing is performed by the control device 101 '. The case where a user's command is received from the operation panel 106 'will be described later.

In this control, the combination of the refrigerator compartment temperature and the freezer compartment temperature is divided into four types in accordance with the respective operating conditions, and the parallel (simultaneous) cooling operation A of the freezer compartment and the freezer compartment is performed for each of them. The parallel and simultaneous cooling operation B of the room and the refrigerating room and the independent cooling operation and stop of the freezing room are performed. This processing will be described with reference to a flowchart.

In FIG. 17, if the operation switch of the refrigerator is turned on (400Y), the refrigerator compartment temperature sensor 9 and the freezer compartment temperature sensor 8 indicate the refrigerator compartment temperature T when the operation is stopped.
r, the freezing room temperature Tf is detected (401), and it is determined whether or not the refrigerating room temperature Tr is equal to or higher than the cooling start temperature Trs of the refrigerating room, and whether or not the freezing room temperature Tf is equal to or higher than the freezing room cooling start temperature Tfs ( 402).

The refrigerator compartment temperature Tr is equal to the refrigerator compartment cooling start temperature Tr.
s or more and the freezing room temperature Tf is equal to the freezing room cooling start temperature Tfs.
If this is the case (402a), the operation of the condenser fan 30, the freezer compartment fan 31, the refrigerator compartment fan 32, and the compressor 10 is started (403). The parallel cooling operation A of the refrigerator compartment is performed, and the process proceeds to the code.

If the refrigerator compartment temperature Tr is equal to or higher than the refrigerator compartment cooling start temperature Trs and the freezer compartment temperature Tf is lower than the freezer compartment cooling start temperature Tfs (402b), the solenoid valve 26 is energized and the valve is closed to close the condenser fan. 30, freezer fan 31,
The operation of the refrigerator compartment fan 32 and the compressor 10 is started (42).
0), a parallel cooling operation B of the freezing room and the refrigerating room where the refrigerating room refrigerating capacity is about twice the freezing room refrigerating capacity is performed, and the process shifts to the symbol (D).

If the refrigerator compartment temperature Tr is lower than the refrigerator compartment cooling start temperature Trs and the freezer compartment temperature Tf is higher than the freezer compartment cooling start temperature Tfs (402b), the solenoid valves 23 and 26 are energized to close the valves and condense. The operation of the cooling fan 30, the freezing room fan 31, and the compressor 10 is started (430), the freezing operation of the freezing room alone is performed, and the process shifts to the symbol (E).

If the refrigerator compartment temperature Tr is lower than the refrigerator compartment cooling start temperature Trs and the freezer compartment temperature Tf is lower than the freezer compartment cooling start temperature Tfs (402b), the operation is stopped and the operation proceeds to the sign (C). I do.

When the freezing room and refrigerating room parallel cooling operation A is being performed, a timer is started (404) via a code (B) in FIG. 18 and after a predetermined time elapses (405).
Y), making the temperature sensors 8 and 9 detect the freezer compartment temperature Tf and the refrigerator compartment temperature Tr (406), and determine whether or not the refrigerator compartment temperature Tr is equal to or lower than the refrigerator compartment cooling end temperature Tre and the freezer compartment temperature Tf ends the freezer compartment cooling. It is determined whether the temperature is lower than the temperature Tfe (40).
7).

The refrigerator compartment temperature Tr is equal to the refrigerator compartment cooling end temperature Tr.
e and the freezing room temperature Tf is equal to the freezing room cooling end temperature Tfe.
If not (407a), the compressor 10, the condenser fan 3
0, the operation of the freezer compartment fan 31 and the refrigerating compartment fan 32 is stopped (408), the parallel cooling operation A of the freezer compartment and the refrigerating compartment is terminated, and the process proceeds to the symbol (C).

If the refrigerator compartment temperature Tr is lower than the refrigerator compartment cooling end temperature Tre and the freezer compartment temperature Tf is higher than the freezer compartment cooling end temperature Tfe (407b), the solenoid valves 23 and 26 are closed, and the refrigerator compartment fan 32 is operated. Is stopped (440), the parallel cooling operation A of the freezing room and the refrigerating room is shifted to the freezing room independent cooling operation, and the process moves to the sign (E).

If the refrigerator compartment temperature Tr is higher than the refrigerator compartment cooling end temperature Tre and the freezer compartment temperature Tf is lower than the freezer compartment cooling end temperature Tfe (407c), the solenoid valve 26 is closed (441), and the freezer compartment refrigerator compartment is closed. The process shifts from the simultaneous cooling operation A to the parallel cooling operation B for the freezer compartment and the refrigerator compartment, and then moves to the symbol (D).

If the refrigerator compartment temperature Tr is higher than the refrigerator compartment cooling end temperature Tre and the freezer compartment temperature Tf is higher than the freezer compartment cooling end temperature Tfe (407d), the freezer compartment refrigerator compartment simultaneous cooling operation A is continued. It returns to code (B).

In the case of the operation stop state, through the symbol (C),
The timer is started (409), and after a predetermined time has elapsed (410Y), the process returns to the code (A).

When the parallel cooling operation B of the freezer compartment and the refrigerating compartment is performed, the timer is started (421) via the reference (D) in FIG.
Y), making the temperature sensors 8 and 9 detect the freezer compartment temperature Tf and the refrigerator compartment temperature Tr (423), and determine whether or not the refrigerator compartment temperature Tr is equal to or lower than the refrigerator compartment finish temperature Tre, and the freezer compartment temperature Tf is finished. It is determined whether the temperature is lower than the temperature Tfe (42).
4).

The refrigerator compartment temperature Tr is equal to the refrigerator compartment cooling end temperature Tr.
e and the freezing room temperature Tf is equal to the freezing room cooling end temperature Tfe.
If it is less than (424a), the compressor 10, the condenser fan 3
0, the operation of the freezer compartment fan 31 and the refrigerating compartment fan 32 is stopped (408), the parallel cooling operation B of the freezer compartment and the refrigerating compartment is terminated, and the process proceeds to the symbol (C).

If the refrigerator compartment temperature Tr is equal to or lower than the refrigerator compartment cooling end temperature Tre and the freezer compartment temperature Tf is higher than the freezer compartment cooling end temperature Tfe (424b), the solenoid valve 23 is closed.
The operation of the refrigerating compartment fan 32 is stopped (426), and the parallel cooling operation B of the refrigerating compartment and the refrigerating compartment is shifted to the freezing compartment individual cooling operation, and the process moves to the symbol (E).

If the refrigerator compartment temperature Tr is higher than the refrigerator compartment cooling end temperature Tre and the freezer compartment temperature Tf is equal to or lower than the freezer compartment cooling end temperature Tfe (424c), the parallel cooling operation B of the freezer compartment and the refrigerator compartment is continued. , And return to code (D).

If the refrigerator compartment temperature Tr is higher than the refrigerator compartment cooling end temperature Tre and the freezer compartment temperature Tf is higher than the freezer compartment cooling end temperature Tfe (424d), the solenoid valve 26 is opened (427), and the freezer compartment is opened. A transition is made from the parallel cooling operation B of the refrigerator compartment to the refrigerator compartment cooling operation A of the freezer compartment, and then to the symbol (B).

When the freezing operation of the freezing compartment alone is being performed, the timer is started (431) via the symbol (E) in FIG. 20, and after a predetermined time has passed (432Y), the temperature sensors 8 and 9 are supplied with the freezing compartment temperature. Tf and the refrigerator compartment temperature Tr are detected (433), and the refrigerator compartment temperature Tr becomes the refrigerator compartment cooling start temperature T.
It is determined whether the temperature is equal to or higher than rs, and whether the freezing room temperature Tf is equal to or lower than the freezing room cooling end temperature Tfe (434).

The refrigerator compartment temperature Tr is equal to the refrigerator compartment cooling start temperature Tr.
s or more and the freezing room temperature Tf is equal to the freezing room cooling end temperature Tfe.
If it is below (434a), the operation of the refrigerator compartment fan 32 is started, the solenoid valve 23 is opened (435), and the freezing room cooling operation is shifted to the freezing room simultaneous cooling operation B, and the process moves to the symbol (D). .

If the refrigerator compartment temperature Tr is higher than the refrigerator compartment cooling start temperature Trs and the freezer compartment temperature Tf is higher than the freezer compartment cooling end temperature Tfe (434b), the operation of the refrigerator compartment fan 32 is started, and the solenoid valve 23 is activated. 26 is opened (436), and the operation proceeds from the freezing compartment independent cooling operation to the freezing compartment cooling room simultaneous cooling operation A, followed by reference numeral (B).

If the refrigerator compartment temperature Tr is lower than the refrigerator compartment cooling start temperature Trs and the freezer compartment temperature Tf is higher than the freezer compartment cooling end temperature Tfe (434c), the freezing compartment independent cooling operation is continued and the symbol (E) is reached. Return.

If the refrigerator compartment temperature Tr is lower than the refrigerator compartment cooling start temperature Trs and the freezer compartment temperature Tf is less than the freezer compartment cooling end temperature Tfe (434d), the compressor 10, the condenser fan 30, and the freezer compartment fan 31 Stop the operation, solenoid valve 2
After opening 3 and 26 (437), the freezer operation is terminated, and the process proceeds to the symbol (C).

The setting of the compressor rotation speed is, for example, the larger of the temperature difference between the refrigerator compartment temperature Tr and the refrigerator compartment cooling end temperature Tre and the temperature difference between the freezer compartment temperature Tf and the freezer compartment cooling termination temperature Tfe. The control is performed almost in proportion to the difference.

With respect to the defrosting operation control, for example, the operation time of the freezer compartment fan 31 is integrated, and when a predetermined time is reached,
The electric heaters 6 and 7 for defrosting are energized, and the evaporators 22 and 2 are turned on.
6 is defrosted and the surface temperature of the evaporator is measured by a temperature sensor 8
When the temperature is detected at 0 and 81, and the temperature of each evaporator becomes equal to or higher than a predetermined temperature, the power supply to the electric heaters 6 and 7 is stopped, and the defrosting operation is stopped.

When the user operates the rapid cooling button 90 on the operation panel 106 ', the cooling operation of the refrigerator compartment is performed preferentially. At this time, the cooling operation of the refrigerating compartment is forcibly set to be strong, and the temperatures of the refrigerating compartment and the freezing compartment are set accordingly. Then, the parallel cooling operation B of the freezing room and the refrigerating room in which the refrigerating capacity of the refrigerating room is larger than the freezing room refrigerating capacity is performed for a predetermined time. The rotation speed of the compressor is set substantially in proportion to the temperature difference between the refrigerator compartment temperature Tr and the refrigerator compartment cooling end temperature Tre, and this proportionality constant is set to a value larger than usual. As a result, the cooling capacity of the refrigeration cycle is greater than in the normal operation, and the refrigerator compartment is cooled in a shorter time and at a lower temperature.

When the user presses the quick freezing button 90 on the operation panel 106 ', the freezing operation of the freezing compartment is performed preferentially. At this time, the cooling operation of the freezer compartment is forcibly set to a high level, and the temperature of the freezer compartment is set accordingly. Then, the cooling operation of the freezing room alone is performed for a predetermined time. In this embodiment, the rotation speed of the compressor during this operation is set to the maximum rotation speed of the compressor.

As described above, in this embodiment, the power consumption of the refrigerator can be further reduced by properly using the three operation modes according to the load during the normal operation.

Further, by selecting an operation mode in accordance with a user's command, efficient operation can be performed.

The data of the effects of the refrigerator according to the above-described embodiment will be described below. FIG. 21 is a graph showing the power consumption of the refrigerator according to the embodiment of the present invention and the conventional refrigerator. As shown in FIG. 21, the power consumption when only the freezer compartment needs to be cooled is lower in the conventional example in which only the freezer compartment cooler simultaneous cooling operation is performed than in the present invention, as compared with the present invention. Input, fan input, etc.)
In addition, heater power consumption (equivalent to the cooling capacity of the refrigerator) for preventing the freezing of food in the refrigerator is required. Therefore, at this time, in the embodiment of the present invention, the power consumption is, for example, about one-third as compared with the conventional example, and the power consumption can be significantly reduced.

Although a direct object of the present invention is a refrigerator, the present invention can be applied to a refrigerating air conditioner other than a refrigerator having a plurality of evaporators having different evaporation temperatures and cooling a plurality of rooms.

In the refrigerator of the first embodiment, as shown in FIG. 2, the refrigerator main body (box) has a structure in which a freezer compartment and a refrigerator compartment are integrated. Can be applied to a refrigerator composed of a plurality of boxes as separate boxes.

In the first embodiment, the compressor is
Roller part and vane part are formed integrally (the roller part of the piston that moves in the cylinder has a vane part)
Although described using a two-cylinder rotary compressor, the present invention relates to other compressors having two or more compression elements,
For example, a rotary compressor, a reciprocating compressor, or a scroll compressor in which the roller section and the vane section are separate bodies may be used. Further, a plurality of compressors having one compression element may be combined.

[0182]

As described above, according to the present invention,
A refrigerator that includes a cooler that individually cools a plurality of storage rooms and efficiently cools the inside of the refrigerator can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a configuration of a refrigeration cycle of a refrigerator according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view schematically showing a refrigerator using the refrigeration cycle of the embodiment shown in FIG.

FIG. 3 is a longitudinal sectional view showing a structure of a compressor included in the refrigeration cycle shown in FIG.

FIG. 4 is a perspective view showing a structure of a second cylinder, a partition plate, a first cylinder, an auxiliary bearing, and a first discharge chamber cover which are parts of the compressor shown in FIG.

FIG. 5 is a perspective view showing a structure of a valve which is a component of the compressor shown in FIG.

6 is a perspective view showing a structure of a main bearing, a second discharge chamber sub-cover, and a second discharge chamber main cover which are components of the compressor shown in FIG.

FIG. 7 is a cross-sectional view showing a structure of a second cylinder portion side in a cross section XX of the compressor shown in FIG. 3;

8 is a graph showing a pressure difference between a pressure in a compression chamber and a pressure in a closed vessel during one rotation when the compressor shown in FIG. 3 performs two-stage compression.

9 is a graph showing a pressure difference between a pressure in a compression chamber and a pressure in a closed vessel during one rotation when the compressor shown in FIG. 3 performs single-stage compression.

10 is an operation control flowchart of the refrigerator of FIG. 2;

FIG. 11 is a schematic diagram illustrating a configuration of a refrigeration cycle of a refrigerator according to a second embodiment of the present invention.

FIG. 12 is a table showing an opening / closing operation of a solenoid valve of the refrigeration cycle of FIG. 11;

FIG. 13 is a perspective view of a refrigerator schematically showing a refrigerating cycle of the refrigerator according to a third embodiment of the present invention.

FIG. 14 is a longitudinal sectional view schematically showing the refrigerator of FIG.

FIG. 15 is an operation panel of the refrigerator in FIG. 14;

FIG. 16 is a table showing an opening and closing operation of a solenoid valve of the refrigeration cycle of FIG.

FIG. 17 is a part of a flowchart showing the operation control flow of the refrigerator in FIG. 14;

FIG. 18 is a part of a flowchart showing the operation control flow of the refrigerator in FIG.

FIG. 19 is a part of a flowchart showing the operation control flow of the refrigerator in FIG. 14;

20 is a part of a flowchart showing the operation control flow of the refrigerator in FIG.

FIG. 21 is a graph showing the power consumption of the refrigerator according to the embodiment of the present invention and the conventional refrigerator.

[Description of Signs] 1,1 ': Refrigerator body 2, 2A, 2B ... Freezer room 3, 3A ... Refrigerator room 3B ... Vegetable room 6, 7 ... Electric heater for defrosting 8, 9 ... Temperature sensor 10, 10', 10 ″ compressor 11 low-stage compression element 11a ′ low-stage compression element suction pipe 11b ′ low-stage compression element discharge pipe 12 high-stage compression element 12a ′ high-stage compression element suction pipe 12b ′, 12b ′ '... High-stage compression element discharge pipe 12c ... Pressure forming passage in closed container 13a, 13b ... Check valve 20, 20A, 20B ... Condenser 21, 24 ... Capillary 22 ... Freezer evaporator 23,26,70a, 70b, 71a, 71b ... solenoid valve 25 ... refrigerator evaporator 27 ... intercooler 40 ... airtight container 42 ... crankshaft 44 ... main bearing 45, 47 ... cylinder 46 ... partition plate 48 ... sub-bearing 49, 50, 51 ... discharge chamber Cover 52,5 3. Roller 63 ... Oil pocket 101, 101 '... Control device 102, 103, 104, 105 ... Inverter 106, 106' ... Operation switch

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kenichi Oshima 800, Tomita, Ohira-machi, Ohira-machi, Shimotsuga-gun, Tochigi Prefecture Inside the Cooling and Refrigerating Business Dept., Hitachi, Ltd. (72) Inventor: Akihiko Ishiyama 800, Oda-machi, Ohira-machi, Shimotsuga-gun, Tochigi Prefecture Inside Hitachi, Ltd.Cooling Division (72) Inventor: Isao Hayase 502, Kandachicho, Tsuchiura-shi, Ibaraki Prefecture Hitachi, Ltd. Inside the Machinery Research Laboratory (72) Inventor Hiroaki Matsushima 502, Kandamachi, Tsuchiura-shi, Ibaraki Pref.

Claims (20)

[Claims] 1. A compressor having a first evaporator for cooling a freezer compartment, a second evaporator for cooling a refrigerator compartment, and a first compression element and a second compression element for compressing a refrigerant. A refrigerator provided with a refrigeration cycle connected to a condenser, wherein the first evaporator and the first compression element are in communication with each other.
, A second refrigerant flow path communicating the first compression element to the second compression element, and a second flow path communicating the second evaporator and the second refrigerant path. 3. A refrigerator comprising: 2. A compressor having a first evaporator for cooling a freezer compartment, a second evaporator for cooling a refrigerator compartment, and a first compression element and a second compression element for compressing a refrigerant. A refrigerator connected to a condenser and having a refrigeration cycle in which a refrigerant flows from the condenser to the first and second evaporators separately, wherein the first evaporator communicates with the first compression element. The first
, A second refrigerant flow path communicating the first compression element to the second compression element, and a second flow path communicating the second evaporator and the second refrigerant path. A refrigerator comprising: a refrigerant flow path of No. 3; and means for suppressing a flow of refrigerant from the condenser to the second evaporator. 3. An operation in which the refrigerant flows from the first and second evaporators through the flow paths of the first, second and third refrigerants, and an operation of the refrigerant flowing from the condenser to the second evaporator. 3. The refrigerator according to claim 1, further comprising an operation in which a flow is suppressed and a refrigerant flows through the first evaporator to the compressor. 4. 4. The refrigerator according to claim 3, wherein a flow of the refrigerant from the condenser to the first evaporator is suppressed, and the refrigerant flows to the compressor through the second evaporator. 5. A compressor having a first evaporator for cooling a freezer compartment, a second evaporator for cooling a refrigerator compartment, and a first compression element and a second compression element for compressing a refrigerant. A refrigerator having a refrigerating cycle connected to a condenser, wherein the refrigerant flows in the order of the first evaporator, the first compression element, the second compression element, and the second evaporator, A flow of a first refrigerant flowing in the order of two compression elements, and a flow of a second refrigerant in which the refrigerant flows through the first evaporator to the compressor. A refrigerator that operates by switching the flow of the second refrigerant. 6. The refrigerator according to claim 5, wherein the refrigerator is operated by switching to a flow of a third refrigerant in which the refrigerant flows through the second evaporator to the compressor. 7. When the refrigerant flows through the first evaporator to the first and second compression elements, the refrigerant flows in parallel with the first compression element and the second compression element. The refrigerator according to claim 5 or 6, wherein the flow is carried out. 8. An operation means provided on a door of the refrigerator, the operation means being capable of being operated by a user to adjust the operation of the refrigerator, and
Alternatively, a refrigerator capable of selecting any one of the operations based on the flow of the second or third refrigerant. 9. An adjusting means for variably adjusting the rotation of an electric motor for driving the compressor, and an operation by the flow of the second refrigerant is selected by operating the operating means, and the compression means is selected by the adjusting means. Refrigerator with increased rotation speed. 10. A first cooler for cooling a first storage chamber, a second cooler for cooling a second storage chamber, a compressor having first and second compression elements, and a condenser. A refrigerator having a refrigeration cycle connected to a condenser, a refrigerant pipe connected to a discharge passage from the first compression element and an inlet of the condenser, an outlet of the condenser, and a first cooler. And a refrigerant pipe connected to the second cooler, a first suction passage connected to the first cooler and the first compression element, a second cooler and the second cooler. Refrigerant flowing from the first suction passage to the second suction passage provided in a second suction passage connected to the second compression passage and a passage connected to the first and second suction passages; First valve means for stopping pressure, a discharge passage from the first compression element and the second valve means.
A second valve means provided in a passage connected to a discharge passage from the compression element for stopping a flow of refrigerant from a discharge passage of the first compression element to a discharge passage of the second compression element;
A connection passage between a discharge passage from the second compression element and the first suction passage, a flow of a refrigerant passing through the first cooler and the first suction passage, and a flow of the refrigerant from the second compression element. A refrigerator comprising an adjusting means for adjusting a flow of a refrigerant flowing through a first compression element. 11. The condenser according to claim 11, wherein said adjusting means comprises:
And a branch portion provided on a refrigerant pipe connecting the first and second coolers, and branching the refrigerant pipe to the first and second coolers, and a refrigerant between the branch portion and the first cooler. First adjusting means provided on the tube for adjusting the flow of the refrigerant in the tube;
Second adjusting means provided on a connection passage between the discharge passage from the second compression element and the first suction passage for adjusting the flow of the refrigerant in the passage, and the first and second adjustments 11. A refrigerator according to claim 10, comprising control means for adjusting the means. 12. The apparatus according to claim 1, wherein said first or second adjusting means is an electromagnetic valve, and said control means adjusts said electromagnetic valve.
The refrigerator according to claim 1. 13. A heat exchanger provided on a connecting passage between a discharge passage from the second compression element and the first suction passage, and a discharge from the heat exchanger and the second compression element. 13. The refrigerator according to claim 11, further comprising the second adjusting means provided between the refrigerator and a passage. 14. A compressor having a first cooler for cooling a first storage chamber, a second cooler for cooling a second storage chamber, a compressor having first and second compression elements, and a condenser. A refrigerator having a refrigeration cycle connected to a condenser, a refrigerant pipe connected to a discharge passage from the first compression element and an inlet of the condenser, an outlet of the condenser, and a first cooler. And a refrigerant pipe connected to the second cooler, a first suction passage connected to the first cooler and the first compression element, a second cooler and the second cooler. A second suction passage connected to the second compression element, a connection passage between the discharge passage from the second compression element and the first suction passage, the first compression element and the second compression element. Provided with an airtight container arranged inside, and an opening communicating with the first suction passage and a space in the airtight container. refrigerator. 15. A first valve means provided in a passage connected to the first and second suction passages for stopping a flow of refrigerant from the first suction passage to the second suction passage, and the first valve means; The refrigerant flowing from the discharge passage of the first compression element to the discharge passage of the second compression element is provided in a passage connected to a discharge passage from the first compression element and a discharge passage from the second compression element. A second valve means for stopping flow, a refrigerant flow passing through the first cooler and the first suction passage and a refrigerant flow flowing from the second compression element to the first compression element are adjusted. 15. The refrigerator according to claim 14, further comprising an adjusting means for adjusting the temperature. 16. An operation in which the refrigerant supplied to the second cooler passes through the first and second compression elements in order, and the refrigerant supplied to the second cooler is The refrigerator according to any one of claims 10 to 15, wherein an operation of diverting and passing the first compression element and the second compression element is switched. 17. An operation in which the refrigerant supplied to the second cooler passes through the first and second compression elements in order, and the controller supplies the refrigerant supplied to the second cooler. An operation in which the refrigerant is divided into the first compression element and the second compression element and passes therethrough;
The refrigerator according to any one of claims 10 to 15, wherein the operation is switched to the operation that passes only the compression element. 18. A first evaporator and a second evaporator for cooling a room, a first compression element for compressing a refrigerant, and a second evaporator.
A refrigerating and air-conditioning apparatus having a refrigerating cycle in which a compressor having a compression element and a condenser are connected, wherein a first evaporator and a first compression element are communicated with each other.
, A second refrigerant flow path communicating the first compression element to the second compression element, and a second flow path communicating the second evaporator and the second refrigerant path. A refrigeration / air-conditioning apparatus comprising: 19. A first evaporator and a second evaporator for cooling a room, a first compression element for compressing a refrigerant, and a second evaporator.
A compressor having a compression element and a condenser,
In a refrigeration / air-conditioning apparatus provided with a refrigeration cycle in which refrigerant flows separately from the condenser to the first and second evaporators, a first refrigeration system in which the first evaporator and a first compression element are communicated with each other.
, A second refrigerant flow path communicating the first compression element to the second compression element, and a second flow path communicating the second evaporator and the second refrigerant path. A refrigeration / air-conditioning apparatus comprising: a refrigerant flow path of No. 3; and means for suppressing a flow of the refrigerant from the condenser to the second evaporator. . 20. The method according to claim 19, wherein the first and second evaporators are connected to the first evaporator.
And an operation in which the refrigerant flows through the flow paths of the second and third refrigerants;
20. The refrigerating and air-conditioning apparatus according to claim 18, further comprising: an operation in which a flow of the refrigerant from the condenser to the second evaporator is suppressed, and the refrigerant flows through the first evaporator to the compressor.