JPS60259867A - Refrigeration cycle device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a refrigeration cycle device that can achieve three different functions of cooling, refrigeration, and freezing with one compressor, and is suitable for use in automobiles. It is.

[Prior art]

Conventionally, air-conditioning devices installed in automobiles and freezing/refrigerating devices for cooling drinking water and the like have used separate refrigeration cycles. That is, as many compressors and condensers as there are refrigeration cycles are required.

However, when two systems are provided, one for cooling and one for refrigerating and freezing, an independent compressor is required for each cycle. Further, when a plurality of condensers are provided, an open space is required for the heat radiation of the condensers, and for example, in an automobile where installation space is limited, a problem arises in selecting an installation location. Furthermore, since there are multiple systems, there are drawbacks such as high manufacturing costs (2).

[Problem that the invention seeks to solve]

Therefore, the present invention relates to a refrigeration cycle device with one pressure wI.
The aim is to achieve three different functions, depending on the machine: cooling, refrigeration, and freezing.

c. Means to Solve Problem] In order to solve the above problem, in the present invention, at least an air-conditioning inlet, a refrigeration inlet, and a freezing inlet are provided independently, and the air flow from the three inlets is A compressor configured to compress each sucked refrigerant and discharge it from one discharge port, and a condenser configured to condense the gas refrigerant discharged from the compressor into liquid refrigerant; a cooling pressure reducing device and a cooling evaporator provided between the refrigerant outlet side of the condenser and the cooling suction port, and between the refrigerant outlet side of the condenser and the cooling suction port,
(3) A refrigeration pressure reduction device and a refrigeration evaporator provided between the refrigerant outlet side of the condenser and the refrigeration inlet; It consists of:

〔Example〕

Hereinafter, the present invention will be explained in detail based on specific examples.

Figure 1 shows a specific implementation (
? 1 is a refrigeration cycle diagram showing the configuration of FIG. compression! 21 is coupled to a drive shaft of an automobile engine (not shown) via an electromagnetic clutch 20.

This compressor 21 is a swash plate type with 10 cylinders, of which 8 cylinders are used for a compression section 21a for cooling, 1 cylinder of the remaining 2 cylinders is used for a compression section 21b for refrigeration, and the remaining 1 cylinder is used for refrigeration. It is used for the compression section 2tC. In this case, each of the compressor sections 21a, 21b, and 21C of the compressor 21 is connected to a cooling inlet 21a1, a refrigeration inlet 21b1, and a freezing inlet 21c1, respectively. Also, the cooling compression section 2
1a and the refrigerating compression section 21b are connected to the first series 1ffl path 21e.
are connected to the cooling compression section 21a and the freezing compression section 21c.
The refrigerants (R12) with different pressures are communicated through the second communication passage 21f and are inhaled from each suction (4) port.
The refrigerant is communicated with the communication passage 21e and the communication passage 21f before being compressed in each compression section, and after being raised to the pressure of the cooling refrigerant, is compressed in each compression section and discharged from a common discharge port 21d. It has become so.

Here, if the compressor 21 is a swash plate type compressor with 10 cylinders, 2.5 kg/- of refrigerant sucked from the cooling suction port 21al passes through a swash plate chamber (not shown), and passes through the 8 cylinders, which is the cooling compression section 21a. It is designed to be inhaled into each of the insides of the body. On the other hand, 1.2 kg/cd of refrigerant is sucked into the refrigeration compression section 21b from the refrigeration suction port 21b1, and 1.2 kg/cd of refrigerant is sucked into the refrigeration compression section 21C from the refrigeration suction port 21C1.
．． It is configured to suck 5 kg/- of refrigerant. Therefore, if slits corresponding to the communication passages 21e and 21f are provided near the bottom dead center of the cylinder, which is the compression part for refrigeration and freezing, when the cylinder reaches the slit part, the inside of the cylinder, which is the compression part 21b for refrigeration, The inside of the cylinder, which is the refrigeration compression section 2IC, communicates with the swash plate chamber (5) and has the same pressure as the refrigerant inside the swash plate chamber, that is, 2.5
kg/cJ.

Therefore, the refrigeration compression section 21b and the freezing compression section 21c
Since the refrigerant can be compressed by the piston from the same pressure as the cooling compression section 21a, the compressor 21 is
Because of the different suction pressure conditions, it saves power compared to compression.

In addition to the swash plate type multi-cylinder compressor as described above, a vane type compressor can also be applied. In that case,
Along the rotation direction of the rotor, in descending order of suction pressure: freezing inlet 21, CL refrigeration inlet 21b1, cooling inlet 2
If 1a1 is opened, each compression part 21C121b
, 21a can all start compression with the highest suction pressure of 2.5 kg/c+a. As described above, each compression section of the compressor 21 of this embodiment is provided with an independent suction port, and it is possible to make the suction pressure of each compression section independent.

The discharge port 21d of the compressor 21 is connected to a condenser 22, and the discharge side of the condenser 22 is connected to a receiver 23 (6). The discharge side of the receiver 23 is provided with a cooling pressure reducing device, in this example a temperature-operated expansion valve 24, and a cooling evaporator 25 connected thereto.
A cooling air blowing fan 50 is disposed on the upstream side of the air conditioner 5. The outlet of the evaporator 25 is connected to the cooling suction pipe 4
5 is connected to the main suction port 21a1 of the compressor 21. On the other hand, the evaporator 26 for refrigeration is connected to the expansion valve 24.
and is provided in parallel with the evaporator 25. The refrigeration evaporator 26 includes a constant pressure l11 tension valve 27, which is a specific example of a refrigeration pressure reducing device, a refrigeration evaporator 28 connected to this, and a check valve 29 that allows refrigerant gas to pass in only one direction. Become.

The discharge side of this check valve 29 is connected to the refrigeration suction port 21b1 of the compressor 21 through a refrigeration suction pipe 46. The constant pressure expansion valve 27 opens when the downstream pressure thereof, that is, the pressure of the refrigerating evaporator 28, drops below a set pressure, for example, 1.2 kg/cn.

A freezing evaporator 30 is provided in parallel with the refrigeration evaporator 26 (and). The refrigeration (7) evaporator 30 includes a constant pressure expansion valve 31, which is a specific example of a refrigeration pressure reducing device, a refrigeration evaporator 32 connected thereto, and a check valve 33 that allows refrigerant gas to pass in only one direction. It consists of

The discharge side of this check valve 33 is connected to the refrigeration suction port 21C1 of the compressor 21 by a refrigeration suction pipe 47. Further, the constant pressure expansion valve 31 opens when the downstream pressure thereof, that is, the pressure of the freezing evaporator 32, decreases to a set pressure, for example, 0.5 kg/- or less.

A first solenoid valve 48 is provided between the cooling suction pipe 45 and the refrigeration suction pipe 46, and the suction pipes 45 and 46 are brought into communication when the first solenoid valve is opened on the fourth day. Further, a second solenoid valve 49 is provided between the cooling suction pipe 45 and the freezing suction pipe 47, and when the second solenoid valve 49 is opened, the suction pipes 45 and 47 are brought into communication. .

Next, the electric circuit of the refrigeration cycle device configured as described above will be explained.

3 is an on-vehicle battery, and a cooling control box (8) 3 is connected to this battery 1 via an air conditioner switch 2. 4 is a refrigerator switch, which is connected to the battery 1 via the air conditioner switch 2;
A refrigerator control box 5 is connected to the refrigerator switch 4. Reference numeral 6 denotes a thermistor attached to the air outlet side of the cooling evaporator 25, which is connected to the cooling control box 3. Then, the resistance value increases,
The cooling control box 3 senses this change in resistance value and activates the electromagnetic clutch 20 to prevent the cooling evaporator from freezing.
The compressor 21 is turned off and the compressor 21 is stopped.

A thermistor 7 is installed to sense the surface temperature of the regenerator 67 in which the refrigerating evaporator 28 is housed, and 8 is installed to sense the surface temperature of the regenerator 65 in which the freezing evaporator 32 is housed. Thermistors 7 and 8 are both controlled by the refrigerator control box 5.

The refrigerator control box 5 energizes the first solenoid valve 48 to open the first solenoid valve (9) 48 when the temperature sensed by the thermistor is below a set value. Further, when the temperature sensed by the thermistor 8 is below the set value, the second solenoid valve 49 is energized and the second solenoid valve 49 is energized.
8 to open the valve.

The control box 5 is adapted to turn on a display device such as a lamp or LED (not shown) based on the temperature detected by the thermistor 7.8.

Next, a specific structure of a vehicle-mounted refrigerator-freezer having the above-mentioned refrigerating evaporator 28 and freezing evaporator 32 will be described. FIG. 2 illustrates a specific structure of a refrigerator-freezer for a vehicle, and the refrigerator 60 according to the present invention has a so-called double wall structure using a double resin member made of polyethylene or polypropylene. There is. Furthermore, a heat insulating material such as hard polyurethane is injected between the double wall structures to improve heat insulation. Similarly to this, there are 2 in the refrigerator 60.
The refrigerator 60 has a door 61 that combines a heavy wall structure and a VFI thermal material such as hard polyurethane, and can be opened and closed using a hinge.
A rubber member with a built-in magnet is fixed to the periphery of the door 61, and this rubber member is securely attracted and fixed by magnetic force to a steel plate (not shown) fixed to the periphery of the door 61. It is now possible to do so. A lining layer made of a material such as aluminum or stainless steel with excellent thermal conductivity is arranged on the entire inner surface of the refrigerator 60 including the door 61. heat should be conducted to the lining layer ([J
A letter-shaped heat conductive gasket is attached. The inside of the refrigerator 60 is divided into upper and lower parts by a partition plate 62 made of a hard member with excellent thermal conductivity. A freezer 63 is installed in the upper left side of the interior of the refrigerator, which is above the partition plate 62, and is made of a double resin member similar to that of the refrigerator 60, with a resin insulation material injected inside. A door 64 having a similar double wall structure and a heat insulating material such as hard polyurethane is connected to the door 63 by a hinge so as to be openable and closable. The inner surface of the freezer 63 is provided with a lining layer having excellent thermal conductivity, similar to the inner surface of the refrigerator 60. Freezer 63
Deep inside, a refrigerating regenerator 65 made of a material with excellent thermal conductivity and contact resistance, such as stainless steel or aluminum, and having an appropriate internal capacity is arranged so that its outer surface is in contact with the lining layer. ing. Inside the freezing regenerator 65,
In order to maintain the freezing temperature for a long time, 400 g of a 24% solution of calcium chloride with a melting point of -11°C is used as a cold storage material for freezing, and a refrigerant evaporator made of copper pipe or the like is bent into a meandering shape. 32 are arranged. A constant pressure expansion valve 31 is provided on the refrigerant inlet side of the freezing refrigerant evaporator 32, and a check valve 33 is provided on the refrigerant outlet side. The interior of the freezer 63, excluding the freezing regenerator 65, is partitioned into two sections by a partition plate 66, and the upper and lower spaces are used to store objects A to be frozen. A refrigerating regenerator 67 having an appropriate capacity is installed inside the refrigerating regenerator 67, which is made of a member similar to the refrigerating regenerator 65, on the right side of the upper chamber of the partition plate 62. It is installed so as to be in contact with the lining layer arranged on the inner surface. Inside the refrigerating regenerator 67, 1000 g of water is sealed as the refrigerating regenerator 14, and a refrigerant evaporator 28, which is bent by a vibrator or the like and formed into a meandering shape, is installed. Refrigerant refrigerant evaporator 2
A constant pressure expansion valve 27 is provided on the refrigerant inlet side of 8, and a check valve 29 is provided on the refrigerant outlet side. The interior of the refrigerator 60 except for the freezer 63 and the refrigerating regenerator 67 is used as a space for storing objects B to be refrigerated.

Next, the operation of the device of this embodiment will be explained. FIG. 4 is an explanatory Mollier diagram of the refrigeration cycle for explaining the action. The cycle indicated by a solid line 80 in the figure is an operating characteristic curve showing the state of the refrigerant in a refrigeration cycle for cooling, the dashed-dotted line 82 is an operating curve of a refrigeration cycle for refrigeration, and the broken line 81 is
It is an operating characteristic curve of a refrigeration cycle for refrigeration. A current is passed through the field coil of the electromagnetic clutch 20, and the driving force of the engine is transmitted to the compressor 21 by its action, so that the compressor rotates and compresses the refrigerant gas.

At this time, turn on the operation switch 4 of the refrigerator, and turn on the regenerator 65.
．． 67 are -10.5°C and -20°C or higher, respectively, the first solenoid valve 48 and the second solenoid valve 49 are closed, and the refrigerant for cooling, refrigeration, and freezing is supplied to the compressor 21. The air is sucked into the compressor 21 through the suction ports 21al and (13) 21b1.21c.

Here, the refrigerating compression section 21b1 is at the end of the suction process, and the first
P communicates with the cooling compression section 21a through the communication path 21e.
6=Pa), the refrigeration compression section 21C1 communicates with the cooling compression section 21a through the second communication path 21f at the end of the suction process P8-P3), the cooling compression section 21a, the refrigeration compression section 21b, the freezing The pressure in all compression parts 21C is 2.5 kg/
Compress c+fl refrigerant.

The compressed refrigerant gases are mixed together, discharged from the compressor 21, and liquefied by the condenser 22.

(P, s→P+).

The liquefied refrigerant is stored in the receiver 23 and the constant pressure expansion valve 27.3
1 and the action of the temperature-operated chamber expansion valve 24 (Pl-P5, Pl
and PI-P2) in the evaporators 28, 31 and 25 (P5-P6, P7→P8 and P2
=P3). Here, point Pl represents the state of the refrigerant on the high pressure side of the temperature-operated expansion valve 24, P2 represents the state of the refrigerant on the discharge side of the expansion valve 24, and P3 represents the state of the refrigerant on the discharge side of the cooling compression section 21al (14). P4 represents the state of the refrigerant in the mouth, and P4 represents the state of the refrigerant at the discharge port 21d. In the refrigerating/freezing cycle, by appropriately setting the constant pressure expansion valve 27.31, the state of the refrigerant downstream of the constant pressure expansion valve 27.31 is set to P5 and P7. Specifically, the evaporation pressure of the evaporator 28 is increased to 1.2 kg/c+ by the action of the constant pressure expansion valve 27.31.
+! The evaporation pressure of the evaporator 32 is maintained at 0.5 kg.
/ct.

As mentioned above, by maintaining the evaporation pressure in the evaporator 28.32 for freezing and refrigerating at 1.2.0.5 kg/cJ,
It is possible to maintain the refrigerant temperature at -10.5°C and -21°C, respectively, and perform refrigeration and ice-making functions.

Here, when the temperature of the regenerator 65.67 falls below the set temperature (for example, -10.5°C for the regenerator 65 and -20°C for the regenerator 67), the resistance value of the thermistor 7.8 increases, which causes the refrigerator to The control box 5 includes a first solenoid valve 48,
The second solenoid valve 49 is energized and the solenoid valves 48 and 49 are opened 6 Therefore, the cooling refrigerant passes through the suction pipe 45 and from the cooling main suction [] 21a1 to the cooling compression part 21a of the compressor 21.
At the same time, the compressor 21 is introduced into the compression section 21b, 2]c through the refrigerating and freezer inlet 2]1)l, 21C1 through the suction piping 46.47, and the compressor 21 is : All 10 cylinders) can be used for cooling. In this case, when the suction pressure of the refrigeration/freezing compression section 211) and 21C rises to -, the check valve 29.33 closes and at the same time the refrigeration/freezing evaporator 2
8. When the pressure inside 32 begins to rise to -, the constant pressure expansion valve 27.
31 closes. In this way, by closing the valves at both ends, the pressure of the refrigerant in the evaporator 28, 32 is maintained at a low pressure, and the refrigerant remains at a low temperature for a while.

In addition, in an automobile air conditioner, the compressor 21 is controlled intermittently by various signals as is well known, but when the compressor 21 is stopped by this intermittent control, the evaporation pressure in the cooling evaporator 25 is gradually rises, but the pressure inside the evaporator 28, 32, which is used as a substitute for refrigeration and cold 1, does not rise, as in Section 2. The present invention is not limited to the embodiments described above, and various modifications can be made as described below.

(If the compressor 11 is a swash plate type multi-10-cylinder compressor, the number of refrigerating or freezing evaporators 21b and 2ICs is not limited to one cylinder, but may be increased depending on the capacity required for the refrigerator.

(2) The thermistor 7.8 that detects the temperature of the refrigerator-freezer may detect the temperature inside the refrigerator-freezer, or a leet switch or the like may be used instead of the thermistor.
The same method can be implemented by detecting the evaporation pressure of the evaporators 2B and 32 instead of the temperature of the evaporator 32.

(3) In addition to the constant pressure expansion valve 27, a temperature-operated ordinary expansion valve, or a combination of a solenoid valve and a fixed throttle can be used as the pressure reducing device on the refrigeration/freezer side.

〔Effect of the invention〕

As described above, the present invention provides a cooling inlet, a refrigeration inlet, and a refrigeration inlet independently in the suction part of the compressor. ,
A refrigeration cycle and a freezing cycle having a refrigeration evaporator and a refrigeration evaporator can be realized (17). In other words, one compressor can achieve three different cooling functions: air conditioning, refrigeration, and freezing.
This eliminates the need for compressors for refrigeration and freezing, which previously had to be installed, and has the significant effect of reducing the number of parts, weight, and cost.

In addition, the evaporator for refrigeration and the evaporator for freezing can be installed independently so that the evaporation temperature is different, that is, the cooling temperature is different, due to the independent inlet ports mentioned in -. As a result, the optimum temperature can be obtained, and the function as a refrigerator-freezer is improved.

[Brief explanation of drawings]

The drawings all show embodiments of the present invention; FIG. 1 is a refrigeration cycle and an electric circuit diagram, FIG. 2 is a perspective view showing the structure of a refrigerator-freezer, and FIG. 3 is a Molière diagram of the refrigeration cycle. 21... Compressor, 21a... Compression section for air conditioning, 21a
1... Cooling suction 0.21b... Refrigeration compression section, 2
1b1...Refrigerating inlet, 21C...Freezing compression section, 21cl...Freezing inlet, 21d...Discharge port,
21e...first communication hole, 21f...second communication hole, 2
2... Condensing (18) vessel, 23... Liquid receiver, 24... Temperature-operated expansion valve,
25... Evaporator for cooling, 27... Constant pressure expansion valve, 28
...Refrigerating evaporator, 29...Check valve 231...Constant pressure expansion valve. 32... Refrigeration evaporator, 33... Check valve. Representative patent attorney Takashi Okabe (19)

Claims (1)

[Scope of Claims] A cooling suction port, a refrigerating suction port, and a freezing suction port are provided independently, and the refrigerant sucked from each of the three suction ports is compressed and discharged from one discharge port. a condenser configured to condense gas refrigerant discharged from the compressor into liquid refrigerant; and a condenser provided between the refrigerant outlet side of the condenser and the cooling inlet. between the cooling pressure reducing device and the cooling evaporator, and the refrigerant outlet side of the condenser and the refrigeration inlet,
a refrigeration pressure reduction device and a refrigeration evaporator provided; a refrigeration pressure reduction device and a refrigeration evaporator provided between the condenser and the refrigeration inlet; The refrigeration pressure reducing device, (1) The refrigeration cycle device is characterized in that the refrigeration pressure reducing device is set so that the pressure of the refrigerant to be depressurized is successively lowered in the above order.