JPS6017664A - Air-cooling refrigerator - 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 The present invention provides a cooling/refrigeration system characterized in that N1 rows of evaporator sections for freezing and/or refrigeration are connected to a refrigeration cycle forming a cooling device, and an auxiliary compression section is provided in the compressor. There is a type C that relates to refrigeration equipment and is suitable for use in automobiles.

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

However, if two refrigeration cycles are installed, one for cooling and one for refrigerating, an independent compressor is required for each cycle, and especially the pressure on the refrigerating and freezing side is 1i!
In order to obtain low pressure corresponding to its refrigerating and freezing function, the machine
A large compression ratio is inevitably required, and there is a problem in that the drive efficiency of the compressor decreases as a whole. Furthermore, when multiple condensers are provided, an open space is required for heat radiation from the condensers, which poses a problem in selecting an installation location in an automobile.

Furthermore, since it has multiple systems, it has drawbacks such as high manufacturing costs.

Therefore, in order to solve the drawback described in item 1, the present invention disposes a refrigeration evaporator in parallel with a cooling evaporator, and connects the compressor so that the compressor and condenser can be used in common. When divided into main compression section and sub-compression section, and when not performing refrigeration,
It is an object of the present invention to provide a cooling/refrigeration system that performs both cooling and refrigeration in which the main compression section and the auxiliary compression section of a compressor can be used for cooling.

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

FIG. 1 is a refrigeration cycle diagram showing the configuration of a specific embodiment in which the present invention is applied to an automobile air-conditioning/refrigeration system.

The compressor 21 is coupled via an electromagnetic clutch 20 to a drive shaft of an automobile engine (not shown). This compressor 21
is a swash plate type with 10 cylinders, of which 9 cylinders are used for the main compression section 21a for cooling, and only the remaining cylinder is used for the auxiliary compression section 2.
Use as 1b. In this case, the suction ports of the compressor 21 are a main suction port for the main compression section 21a and a main suction port for the sub compression section 21a.
1b and auxiliary suction ports 21d are provided independently, and the refrigerant compressed in each of the main compression section 21a and the auxiliary compression section 21b is discharged from a common discharge port 21e.

As shown in -1-, the auxiliary compression section 21 of the second compressor of this embodiment
In case b, only 10 cylinders are used, and the capacity of the compression space is considerably smaller than that of the main compression section 21a. Furthermore, each compression section is provided with an independent suction port, making it possible to make the suction pressure of each compression section independent.

Therefore, if the evaporator for cooling is connected to the main suction port 21c and the evaporator for refrigerating and freezing is connected to the sub-inlet 21d, the evaporation pressure inside the evaporator for refrigerating and freezing will be the same as that for the cooling device. It is possible to set it lower than the evaporation pressure in the evaporator. Therefore, the refrigerant temperature in the evaporator for refrigerator/freezer is
The temperature of the refrigerant in an evaporator for a cooling device can be lowered. For example, the refrigerant temperature in an evaporator for a cooling device is not set below 5"ckλ in order to prevent the fin surface from freezing. On the other hand, the refrigerant temperature in an evaporator for a refrigerator/freezer is set to lower the evaporation pressure. If the temperature is lower, for example, 0.5 kg/cJ, the temperature can be lowered to -21°C, and the refrigeration device can have an ice-making function.

A discharge port 21e of the compressor 21 is connected to a condenser 22, and a discharge side of the condenser 22 is connected to a receiver 23. On the discharge side of the receiver 23, a temperature-operated expansion valve 24 and a cooling evaporator 25 connected thereto are provided. It is connected to the main suction port 21c of the main compression section 21a by a suction pipe 45. On the other hand, an evaporation section 26 for freezing and refrigeration is provided in parallel with the expansion valve 24 and the evaporator 25. Evaporation section 26 for freezing and freezing
- Consists of a constant pressure expansion valve 27, which is a specific example of a pressure reducing device, an evaporator 28 connected thereto, and a check valve 29 that allows refrigerant gas to pass in only one direction. The discharge side of this check valve 29 is connected to the auxiliary compression section 2 by a suction pipe 46 for refrigeration and freezing.
It is connected to the sub-intake port 21d of 1b. The constant pressure expansion valve 27 opens when its downstream pressure, that is, the pressure of the evaporator 28, drops below a set pressure, for example, 0.5 kg/cffl.

The refrigerating/freezing suction pipe 46 and the cooling suction pipe are communicated through a communication pipe 47.

A solenoid valve 48 is disposed in the communication pipe 47, and when energized, it closes and blocks the flow of refrigerant in the communication pipe 47. A reed switch 49 for detecting the cooling state inside the refrigerator is installed inside a refrigerator (not shown) that includes a built-in evaporator 28 for refrigerating and freezing. This reed switch 49 is configured to close at a temperature higher than a set temperature (for example, 5° C.). A refrigerator operating switch 50 is connected in series to this reed switch 49, and when both the operating switch 50 and the reed switch 49 are closed, the solenoid valve 48 is energized and closed. Note 5
1 is the car basnoteri.

Next, the specific configuration of the compressor 21 is shown in FIGS. 2 and 3. The compressor 21 of this embodiment is of a swash plate type in which the rotational force of a shaft driven by an automobile engine is converted into reciprocating motion of a piston using a swash plate. 5 for 10 cylinders
It has two pistons, and when one side of each piston is on the compression stroke, the other side is on the suction stroke.

In Fig. 2, 1 is a shaft, 2 is a swash plate that is fixed to the shaft 4/foot 1 with a key and rotates together with the shaft 1, and 5 is a piston whose surface is coated with a resin material such as Teflon. This rotation of the swash plate 2 causes the piston 5 to reciprocate through the shoes 3 and balls 4. 6
is a cylinder that supports the reciprocating movement of the piston 5.
It's Tsuku.

21C is a main suction port that communicates with the evaporator 25 and introduces the refrigerant in the cylinder block 6; 8 is a housing located on both sides of the cylinder block 6; It communicates with the board room 12. 9a is a suction boat provided on the valve plates 1 and 9, and 10 is a suction valve formed of an elastic metal plate. Reference numeral 11 denotes an oil chamber, which is normally filled with lubricating oil.

As shown in FIG. 3, the housing 8 has a suction chamber 8b and a discharge chamber 8C for cooling refrigerant formed by a partition wall 8a, and is attached to the cylinder block 6 with bolts 53. In addition, in FIG. 3, broken lines A,
B, C, and D each indicate the position of the cylinder, and 9a and 54 indicate a suction boat and a discharge boat provided in the valve plates 1 and 9, respectively, and the discharge boat 54 is opened and closed by a discharge valve (not shown). Further, the sub-suction chamber 8d in the rear A portion of the five cylinder positions is provided independently from the cooling refrigerant suction chamber 8b by a partition wall 8e. An auxiliary suction port 21d is opened in the auxiliary suction chamber 8d, and the refrigerant sucked from the auxiliary suction port 21d passes through a suction port 9a and is compressed in the cylinder interior 6a shown in FIG. That is, only 6a of the 10 cylinders becomes the sub-compression section.

On the other hand, the refrigerant introduced through the main suction port 21c first flows into the swash plate chamber 12, and then flows into the suction chamber 8b through the gap between the bolt 53 and the bolt hole 55.

The refrigerant compressed in the sub-compression section 6a and the main compression section 21a inside the other cylinder flows from the discharge boat 54 into the discharge chamber 8C via the discharge valve, and flows from the discharge port (not shown) through the connection port 8d. It is designed to be discharged.

Next, the operation of the device of this embodiment will be explained. FIG. 3 is an explanatory Mollier diagram of the refrigeration cycle for explaining the action. A cycle indicated by a solid line 60 in the figure is an operating characteristic curve indicating the state of the refrigerant in a refrigeration cycle for cooling, and a broken line 61 is an operating characteristic curve of a refrigeration cycle for freezing and refrigeration. When 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 2, the compressor rotates and compresses the refrigerant gas.

At this time, turn on the operation switch 50 of the refrigerator, and if the temperature inside the refrigerator is 5°C or higher, the electric valve 48 closes Z゛,
3. Refrigerant for cooling and lθ medium for refrigerating and freezing are supplied to
211) into the compressor 21, and the main compression part 2
1aD)3・■)4) and sub-compression section (P6-・1-'
-7).

The compressed and refrigerant residue is mixed in the compressor 21.
Karakawa, let out (P4 ”P8+ P6-P7), le j
It is liquefied by assembly 22. (P e - "P I) The liquefied refrigerant is stored in the receiver 23 and the actions of the constant pressure expansion valve 27 and the temperature working chamber expansion valve 24 (II), 4P5 and PI
"P2)" evaporates in the evaporators 28 and 25 (Ps=P6 and P2-/P3).Here, the cooling evaporator 25 always maintains the average value of the evaporation pressure in order to prevent the fins from freezing. An evaporation pressure regulating valve 30 is provided on the downstream side of the evaporator to prevent the pressure from falling below 2 kg/cnl.Here, 11 points represent the state of the refrigerant on the high pressure side of the temperature-operated expansion valve 24, and P2 represents the state of the refrigerant on the high pressure side of the temperature-operated expansion valve 24. P4 represents the state of the refrigerant on the discharge side of the main compression section 21a, and P4 represents the state of the refrigerant on the suction side of the main compression section 21a.
Represents the state of the refrigerant at In the refrigerating/freezing cycle, by appropriately setting the constant pressure expansion valve 27, the state of the refrigerant in the first flow of the constant pressure expansion valve f'27 is set to 1)5. The evaporator 28
It is possible to maintain the evaporation pressure of 0.5 kg/cf. Also, 1) 6 points (J indicates the state of the refrigerant entering the suction port of the auxiliary compression section 21b, and P7 indicates the state of the refrigerant at the discharge boat 54 of the auxiliary compression section 21b. , the evaporation pressure in the evaporator 2B for freezing and refrigeration is 0.5 kg/c+
By maintaining the temperature at J, it is possible to maintain the refrigerant temperature at -21°C 2 and perform the ice-making operation.

Here, when the temperature inside the refrigerator falls below a set temperature (for example, 5° C.), the reed switch 49 opens, the electromagnetic valve 48 is de-energized, and the communication pipe 47 is opened. Therefore, the refrigerant for cooling is introduced into the main compression part 21a of the compressor 21 from the main suction L] 21C through the suction pipe 45, and at the same time is introduced into the main compression part 21a from the sub suction port 21d through the suction pipe 46.
The compressor 21 (in this embodiment, all 10 cylinders) can be used for cooling. Further, in this case, when the suction pressure of the sub-compression section increases by 7≦, the check valve 29 closes, and at the same time, when the pressure inside the refrigerating/refrigerating evaporator 28 begins to rise by ≈1, the constant pressure expansion valve 27 closes.

In this way, by closing the valves at both ends, the C evaporator 2
The pressure of the refrigerant in 8 is maintained at a low pressure, and the low temperature is maintained 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 Although the temperature rises gradually, the pressure inside the evaporator 28 for freezing and refrigerating does not rise by 1 in the same way as above. The present invention is not limited to the above-mentioned embodiments, and various modifications can be made as described below.

The auxiliary compression section 21b of the +11 compressor 21 is not limited to - cylinders, but may be increased as needed. For example, 10
Two of the cylinders may be used as the sub-compression section 21b, and the remaining eight cylinders may be used as the main compression section 21a.

As you can see, by increasing the capacity of the sub-compression section 211), the refrigerating and freezing capacity is also improved, making it possible to apply it to the refrigeration system of a refrigerated vehicle.

(2) Constant pressure expansion 'Jt2 as a pressure reducing device on the freezing and refrigeration side
In addition to 7, a normal temperature-operated expansion valve or a combination of a solenoid valve and a fixed throttle can be used.

(3) The reed switch 49 that detects the temperature inside the refrigerator may detect the surface temperature of the evaporator 28, and the solenoid valve 48 is controlled by a temperature sensing element such as a thermistor and its control circuit instead of the reed switch 49. You can do it like this. Further, the same method can be implemented by detecting the evaporation pressure of the evaporator 28 instead of the temperature of the evaporator 28.

(4) It goes without saying that the present invention is not limited to use in automobiles, but can be applied to household cooling and refrigeration equipment.

As described above, the present invention makes it possible to easily create a sub-compression section where only the suction side is independent at a low cost by simply providing the sub-intake L1 in addition to the conventional main suction port provided in the cooling compressor. This sub-compression section makes it possible to realize a refrigerating/freezing cycle having a refrigerating/freezing evaporator having a different evaporation pressure from that of the cooling evaporator.

Furthermore, two different functions, cooling and refrigerating, can be achieved with one compressor, eliminating the need for a compressor and a compressor for refrigerating and freezing, which conventionally required separate installation. This has the advantage of reducing loading space.

In addition, the second aspect of the present invention is to provide a solenoid valve in the middle of the communication path that communicates the refrigerant suction path for cooling and the refrigerant suction path for refrigerator/freezer, and when the refrigerator/freezer side is not operated, the solenoid valve is provided. By opening the communication passage, the sub-J compression section of the compressor can be used for cooling, making it possible to improve the cooling capacity. In short, the present invention provides a single compressor with two independent compression sections and can be used for cooling and refrigeration as needed, making it extremely practical as an air-conditioning and freezing device that performs cooling and refrigeration. It has the effect of being able to provide

[Brief explanation of the drawing]

The drawings all show embodiments of the present invention, and FIG. 1 is a refrigeration cycle diagram, FIG. 2 is a sectional view in the axial direction of the compressor, and FIG. 3 is a plan view of the compressor housing as seen from the cylinder side of the compressor. FIG. 4 is a Mollier diagram of the refrigeration cycle. 21... Compressor, 21a... Main compression section, 21b...
- Sub-compression section, 21C...Main suction 0.21d...Sub-intake port. 22... Condenser, 24... Constant pressure expansion valve for cooling, 25
... Evaporator for cooling, 27... Constant pressure expansion valve for refrigerating and freezing, 28... Evaporator for refrigerating and freezing, 29... Check valve, 4
5... Refrigerant suction pipe for cooling, 46... Refrigerant suction pipe for refrigeration/freezing, 47... Communication pipe, 48... Solenoid valve. Representative Patent Attorney Takashi Okabe Commissioner of the Patent Office Procedural Amendments ■ Case Indication 1982 Patent Application No. 125733 2 Name of Invention Cooling Refrigeration Device 3 Relationship with the Amendment Case Patent Applicant Showa, Kariya City, Aichi Prefecture 1-1 Showa-cho, Kariya-shi, Aichi (426) Nippondenso Co., Ltd. Representative Kengo Toda 4th 1-1-5 Showa-cho, Kariya-shi, Aichi Prefecture 448 Detailed description of the invention in the specification subject to amendment

Claims (2)

[Claims] (1) A compressor having a main compression section and a sub-compression section, the two compression sections being provided independently only on the suction side, and having a common discharge side; a condenser configured to convert a gas refrigerant into a liquid refrigerant; a cooling pressure reduction device configured to expand the liquid refrigerant into a mist refrigerant; and a cooling pressure reducing device installed to evaporate the atomized refrigerant into ambient air. a cooling evaporator for cooling the cooling evaporator; a cooling refrigerant suction passage connecting the cooling evaporator to the suction side of the main compression section; A decompression device for refrigeration and freezing installed in parallel with the decompression device;
A refrigeration/freezing evaporator is provided in parallel with the cooling evaporator to evaporate the atomized refrigerant from the refrigeration/freezing pressure reducing device to perform refrigeration/freezing; A cooling refrigeration device comprising: a refrigerant suction passage for refrigeration connected to a suction side of a sub-compression section. (2) A compressor having a main compression section and a sub-compression section, in which both the compression sections are provided independently only on the suction side, and the discharge side is common; a condenser configured to convert a gas refrigerant into a liquid refrigerant; a cooling pressure reduction device configured to expand the liquid refrigerant into a mist refrigerant; and a cooling pressure reducing device installed to evaporate the atomized refrigerant into ambient air. a cooling evaporator for cooling the cooling evaporator; a cooling refrigerant suction passage connecting the cooling evaporator to the suction side of the main compression section; A decompression device for refrigeration and freezing installed in parallel with the decompression device;
A refrigeration/freezing evaporator is provided in parallel with the cooling evaporator to evaporate the atomized refrigerant from the refrigeration/freezing pressure reducing device to perform refrigeration/freezing, and a refrigerant in the refrigeration/freezing evaporator is provided. a valve disposed on the outflow side so as to allow refrigerant gas to pass only in one direction downstream, and a refrigerant suction passage for connecting the valve to the suction side of the auxiliary compression section; ” It is characterized by comprising a communication passage provided so that the refrigerating/freezing suction passage marked L is communicated with the cooling suction passage marked 011, and a solenoid valve provided so as to open and close this communication passage. Cooling and freezing equipment.