JP2002062020A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator having a helical blade type compressor 100 in which temperature control range in the compartment can be widened. SOLUTION: Between a condenser 12 and an evaporator 20 in a refrigeration cycle 10 having a compressor 100, a refrigerant change-over valve 16 and a plurality of capillary tubes 18-1, 18-2, 18-3 and 18-4 are coupled. Flow rate of refrigerant to the evaporator 20 can be varied by changing over the refrigerant change-over valve 16 and temperature in the compartment can be controlled over a wide range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator equipped with a helical blade type compressor.

[0002]

2. Description of the Related Art Conventionally, there have been reciprocating compressors and rotary compressors. Recently, a helical blade compressor (hereinafter referred to as a helical comp) has been proposed (Japanese Patent Application Laid-Open No. Hei 4-58086). Kaihei 11-257265, etc.).

In the helical comp, a piston roller is eccentrically rotated by a DC motor in a cylinder provided inside a closed case. A blade is provided on the outer peripheral portion of the piston roller so as to spirally reduce the pitch thereof, and a refrigerant is gradually compressed in a compression chamber formed between the blade and the inner surface of the cylinder. .

[0004]

As a refrigeration cycle 200 using the above helical comp, FIG. 9 and FIG.
Refrigeration cycles 200 and 300 are conceivable.

[0005] A refrigeration cycle 200 shown in FIG.
4. Capillary tube 216, evaporator 218, and accumulator 220 are connected.

In the refrigerating cycle 200, when controlling the temperature inside the refrigerator, the helical comp 210 is used.
The number of rotations is varied to change the amount of refrigerant to be supplied, thereby controlling the internal temperature.

However, in this case, there is a problem that the controllable temperature range is limited.

The refrigeration cycle 300 shown in FIG. 10 is different from the refrigeration cycle 200 in that an evaporator for a refrigerator (hereinafter referred to as an evaporator) is provided.
R evaporator 222 (hereinafter referred to as F evaporator) 224 is connected in series, and a three-way valve 226 is provided at the outlet side of the dryer 214, and between the three-way valve 226 and R evaporator 222. A capillary tube for a refrigerator compartment 218 is provided, and a capillary tube for a freezer compartment 230 is provided between the other outlet side of the three-way valve 226 and the F eva 224.

In this case, since there are two evaporators,
Although it is possible to control the freezer compartment and the refrigerator compartment to the respective optimum internal temperatures, it is necessary to change the rotation speed of the helical comp 210 in the same manner as described above when controlling the internal temperatures. There is a problem that the temperature range that can be controlled is limited.

[0010] In view of the above problems, the present invention provides a refrigerator having a helical blade type compressor.
An object of the present invention is to provide a refrigerator capable of widening a control range of a refrigerator temperature.

[0011]

According to a first aspect of the present invention, a piston roller is eccentrically rotated in a cylinder provided in a closed case, and the pitch is spirally reduced on the outer periphery of the piston roller. In a refrigerator equipped with a helical blade type compressor that compresses a refrigerant in a compression chamber formed between a provided blade and the inner surface of the cylinder, the refrigeration cycle includes the compressor, a condenser, an evaporator, A refrigerator having an accumulator and a refrigerant flow variable means connected between the condenser and the evaporator.

According to a second aspect of the present invention, the piston roller is eccentrically rotated in a cylinder provided inside the closed case,
In a refrigerator having a helical blade type compressor mounted on a refrigeration cycle, which compresses a refrigerant in a compression chamber formed between a blade provided on the outer periphery of the piston roller and the inner surface of the cylinder so that the pitch thereof is narrowed in a spiral shape. The refrigeration cycle is a refrigerator comprising the compressor, a condenser, a plurality of evaporators, and an accumulator, and refrigerant flow variable means connected between the condenser and each of the evaporators.

According to a third aspect of the present invention, the refrigerant flow varying means connects a refrigerant switching valve having a plurality of refrigerant outlets to an outlet of the condenser, and the plurality of refrigerant outlets of the refrigerant switching valve have different flow resistances. 3. The refrigerator according to claim 1, wherein the refrigerant inlets of the capillary tubes are respectively connected, and the evaporator is connected to the refrigerant outlets of the capillary tubes.

A fourth aspect of the present invention is the refrigerator according to the third aspect, wherein the refrigerant switching valve has a flow shutoff function.

According to a fifth aspect of the present invention, the refrigerant flow rate varying means is a refrigerant flow rate variable valve.
2. The refrigerator according to 2.

According to the present invention, by providing a refrigerant flow variable means between the condenser and the evaporator, the flow rate of the refrigerant supplied to the evaporator can be changed, and the evaporation temperature of the evaporator can be controlled widely. it can.

Accordingly, the control range of the refrigerator internal temperature can be widened.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A refrigerator according to a first embodiment of the present invention will be described with reference to FIGS.

The refrigerating cycle 10 of the refrigerator according to the present embodiment includes a high-pressure helical blade type compressor (hereinafter, referred to as a helical comp) 100.

(1) Outline of Helical Comp (1-1) Structure of High-Pressure Helical Comp 100 First, referring to FIGS.
The structure of 00 will be described.

As shown in FIG. 1, the casing of the high-pressure helical comp 100 is formed by a closed case 102.

On the left side of the sealed case 102, a DC motor 104 is provided. The DC motor 104 includes a stator 1 provided along the inner peripheral surface of the closed case 102.
06 and a rotor 108 rotating inside the stator 106
have. A cord 110 for supplying a motor current is connected from the stator 106, and extends to the outside of the sealed case 102 via a bushing 112.

The shaft 11 which is the rotation axis of the rotor 108
Reference numeral 4 extends to the right side inside the sealed case 102, and is rotatably supported by a main bearing 116 and a sub bearing 118 so as to be rotatable.

Incidentally, this shaft 114 is
As shown in FIG. 3A, the rotary shaft portion 120 is formed coaxially with the rotor 108 and an eccentric shaft portion 122. The eccentric shaft portion 122 is eccentric by the size of the rotary shaft portions 120 and e. A piston roller 124 made of aluminum is provided on the outer periphery of the eccentric shaft 122.

As shown in FIG. 2, a blade groove 126 is spirally formed on the outer periphery of the piston roller 124.
A blade 128 is arranged along the blade groove 126. The pitch P of the blade 128 is formed so as to become narrower toward the left side.

The piston roller 124 is inserted into a cylindrical cylinder 130 as shown in FIG. The cylinder 130 is fixed inside the closed case 102.

The piston roller 124 includes a cylinder 130
Thrust sheet 132, so that it can be eccentrically rotated on the inner surface
It is rotatably supported by an Oldham ring 134. The thrust sheet 132 is formed of a spring material, and is provided for improving sealing performance and abrasion resistance.
4 is provided to stop rotation so as not to rotate.

A suction pipe 152 is provided on the lower right side of the closed case 102 and communicates with a suction space 154 isolated from the inside of the closed case 102. As shown in FIG. 1, the suction space 154 is located on the right side of the cylinder 130, and has a structure in which the refrigerant flowing in the suction space 154 flows on the right side of the outer peripheral portion of the piston roller 124.

A discharge pipe 156 is provided on the upper right side of the sealed case 102.

(1-2) Lubricating Oil Supply Structure Since it is necessary to supply lubricating oil to the shaft 114,
A lubricating oil 136 is stored inside the closed case 102. Hereinafter, a structure for supplying the lubricating oil 136 to the shaft 114 will be described with reference to FIG.

The lubricating oil 136 stored at the bottom of the closed case 102 is supplied to the oil supply pipe 14 by a positive displacement pump 138.
It is sucked up from zero. This positive displacement pump 138 is shown in FIG.
As shown in (b), the inside of the pump chamber 1 has a circular cross section.
42 are provided, and the shaft 114 has a structure in which the shaft 114 can be eccentrically rotated. The shaft 114 is the pump chamber 1
When the eccentric rotation is performed at 42, the lubricating oil 136 is supplied from the oil supply pipe 140 as described above according to the same principle as the rotary engine.
Is sucked up and flows from the oil supply port 144 provided in the shaft 114 to the oil passage 146.

The oil passage 146 is provided in the axial direction of the shaft 114 as shown in FIG. 5 (a), and oil outlets 148 are provided at predetermined intervals, from which lubricating oil 136 is discharged. The discharged lubricating oil 136 flows around the shaft 114 through the oil groove 150. Thus, the lubricating oil 136 is supplied only by rotating the shaft 114.

(1-3) Operation state of high-pressure helical comp 100 A process in which the refrigerant is compressed by high-pressure helical comp 100 described above will be described below.

The low-pressure refrigerant that has entered the suction pipe 150 flows from the suction space 154 to a compression chamber 158 formed between the piston roller 124 and the cylinder 130. As shown in FIGS. 3A and 4A, the compression chamber 158 is formed in a spiral shape, and has a structure that becomes narrower toward the left side.

When a motor current flows through the DC motor 104, the shaft 114 rotates, and accordingly, the eccentric shaft 1
22 performs eccentric rotation inside the cylinder 130. This state is shown in FIGS. 3 and 4.

When the piston roller 124 rotates, the refrigerant present in the compression chamber 158 gradually moves to the left and is gradually compressed because the interval between the compression chambers 158 is reduced. Then, the refrigerant compressed to a high pressure is discharged from the discharge port 160 shown in FIG. The high-pressure refrigerant flows inside the closed case 102 and is discharged from a discharge pipe 156 located on the right side of the closed case 102.

(1-4) Structure of Low-Pressure Helical Comp The helical comp 100 includes a low-pressure helical comp in addition to the high-pressure helical comp 100 described above.

The difference from the high-pressure helical comp 100 is as follows.
In the flow of the refrigerant.

That is, in the high pressure type, the suction pipe 15
2 flows into the suction space 154 isolated from the closed case 102 and is sent to the compression chamber 158 from there. Then, the air is discharged from the compression chamber 158 into the closed case 102.

However, in the low-pressure helical comp, the refrigerant sucked from the suction pipe 152 is
2 and is sent to the compression chamber 158 from there. Thereafter, the refrigerant is sent from the compression chamber 158 to a discharge space separated from the inside of the sealed case 102, and the refrigerant is discharged from the discharge space via a discharge pipe 156.

(1-5) Modification Example Having Check Valve As shown in FIG. 6, the suction side of the helical comp 100,
That is, the check valve 30 may be provided on the low pressure side of the refrigeration cycle 10 to prevent the refrigerant from flowing backward.

(2) Structure of Refrigeration Cycle 10 FIG. 7 shows the structure of the refrigeration cycle of the refrigerator of this embodiment.

As shown in FIG. 7, the refrigeration cycle 10
Helical comp 100, condenser 12, dryer 1
4 are connected in order.

At the outlet of the dryer 14, a switching valve 16 having four refrigerant outlets is provided.

The refrigerant outlets of the switching valve 16 are provided with capillary tubes 18-1 and 18-2 having different flow resistance specifications.
18-3 and 18-4 are connected.

Here, the capillary tube 18-1 is
The specification of the high temperature zone (5 ° C. to 15 ° C.) in which wine or the like can be stored, the capillary tube 18-2 has the specification of the normal refrigeration temperature zone (0 ° C. to 5 ° C.), and the capillary tube 18-3 has the specification. , A semi-freezing temperature range (0 ° C. to −10 ° C.), and the capillary tube 18-4 has a freezing temperature range (−
(10 ° C. or less).

These four capillary tubes 18-1
The refrigerant outlets Nos. To 18-4 become one and are connected to the inlet of the evaporator 20.

The accumulator 2 is located at the outlet side of the evaporator 20.
2 is connected, and the accumulator 22 is connected to the suction side of the helical comp 100.

In the refrigeration cycle 10 described above, the switching valve 16 selects the capillary tube 18 through which the refrigerant is sent, so that one evaporator 20 can switch from a high temperature zone to a refrigeration temperature zone in multiple stages. In addition, it is possible to control the temperature in the refrigerator in a wide range.

In this case, by changing the rotation speed of the helical comp 100, the flow rate of the refrigerant is changed.
It is also possible to perform temperature control more finely.

(Modification of First Embodiment) The helical compressor 100 is provided by adding a flow rate cutoff function for completely shutting off the flow rate of the refrigerant to the switching valve 16 of the refrigeration cycle 10.
To prevent the refrigerant from flowing back to the discharge side.

<Second Embodiment> Next, a refrigeration cycle 50 according to a second embodiment will be described with reference to FIG.

The refrigeration cycle 10 according to the first embodiment and the refrigeration cycle 50 according to the present embodiment are different from each other in that an evaporator 52 (hereinafter referred to as R-eva) for a refrigerator in a refrigerator and an evaporator 52 for a refrigerator ( (Hereinafter referred to as F eva) 54 in series.

Two switching valves 56 and 58 are provided at the outlet of the dryer 14 in parallel. Between the switching valve 56 and the R-Eva 52, three refrigerating room capillary tubes (hereinafter, referred to as different) having different flow resistance specifications. R Capillary tube)
60-1, 60-2, and 60-3 are provided. Also, between the switching valve 58 and the F-Eva 54, there are three freezing chamber capillary tubes (hereinafter, referred to as different) having different flow resistance specifications.
62-1, 62-2, 6)
2-3 are provided.

Since the refrigeration cycle 50 has the R capillary tubes 60-1, 60-2, and 60-3, the refrigerant flow rate flowing through the R
, And the evaporation temperature can be changed respectively.

Also, since the F-eva 54 also has three F-capillary tubes 62, three different evaporation temperatures can be changed.

Therefore, by switching the switching valve 56 and the switching valve 58, the control range of the internal temperature of the refrigerator compartment and the freezer compartment can be controlled widely.

In this case, by changing the rotation speed of the helical comp 100 to change the refrigerant flow rate,
Temperature control can be performed more finely.

(Modification of the Second Embodiment) By providing the switching valve 56 and the switching valve 58 having the above-described structure with a function of shutting off the refrigerant flow, it is possible to prevent the refrigerant from flowing back into the helical comp 100.

<Modifications> In the above two embodiments, the switching valve and the plurality of capillary tubes are provided to change the refrigerant flow rate. Instead, the refrigerant flow rate can be changed by changing the refrigerant flow rate. Even if a valve is used, it is possible to control the temperature inside the refrigerator over a wide range.

[0061]

As described above, according to the refrigerator of the present invention, the temperature inside the refrigerator can be controlled over a wider range by connecting the refrigerant flow variable means between the condenser and the evaporator.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a low-pressure helical comp.

FIG. 2 is a perspective view of a piston roller.

FIG. 3 is a view showing an operation state of a piston roller inside a cylinder, where (a) is a longitudinal sectional view from the side,
(B) is a sectional view from the front.

4A and 4B show the operation state of the piston roller inside the cylinder, wherein FIG. 4A is a longitudinal sectional view from the side, and FIG. 4B is a longitudinal sectional view from the front.

5A is a side view of a shaft, and FIG. 5B is a longitudinal sectional view of a positive displacement pump.

FIG. 6 is a partially enlarged longitudinal sectional view of a low-pressure helical comp with a built-in check valve.

FIG. 7 is a configuration diagram of a refrigeration cycle showing a first embodiment of the present invention.

FIG. 8 is a configuration diagram of a refrigeration cycle showing a second embodiment.

FIG. 9 is a configuration diagram of a conventional first refrigeration cycle.

FIG. 10 is a configuration diagram of a second conventional refrigeration cycle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Refrigeration cycle 12 Condenser 14 Dryer 16 Switching valve 18 Capillary tube 20 Evaporator 22 Accumulator 100 Helical comp

Claims (5)

[Claims] An eccentric rotation of a piston roller in a cylinder provided in a closed case, between a blade provided on the outer periphery of the piston roller and the inner surface of the cylinder so as to spirally reduce the pitch. In a refrigerator equipped with a helical blade type compressor that compresses refrigerant in a compression chamber formed in a refrigeration cycle, the refrigeration cycle includes the compressor, a condenser,
A refrigerator having one evaporator and an accumulator, wherein refrigerant flow variable means is connected between the condenser and the evaporator. 2. The method according to claim 1, wherein the piston roller is eccentrically rotated in a cylinder provided inside the closed case, and a blade provided on the outer periphery of the piston roller and the inner surface of the cylinder are spirally formed so that the pitch is narrowed. In a refrigerator equipped with a helical blade type compressor for compressing a refrigerant in a compression chamber formed in a refrigeration cycle, the refrigeration cycle includes the compressor, a condenser,
A refrigerator comprising a plurality of evaporators and accumulators, wherein refrigerant flow variable means is connected between the condenser and each of the evaporators. 3. The refrigerant flow varying means connects a refrigerant switching valve having a plurality of refrigerant outlets to an outlet of the condenser, and a refrigerant inlet of a capillary tube having a different flow resistance to each of the refrigerant outlets of the refrigerant switching valve. 3. The refrigerator according to claim 1, wherein the evaporator is connected to a refrigerant outlet of each of the capillary tubes. 4. 4. The refrigerator according to claim 3, wherein the refrigerant switching valve has a flow rate cutoff function. 5. The refrigerator according to claim 1, wherein said refrigerant flow variable means is a refrigerant flow variable valve.