JPS61128062A - Refrigerator using rotary type compressor - 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] a. Field of Industrial Application The present invention relates to a refrigeration system using a rotary compressor.
In particular, the present invention relates to novel improvements for improving the refrigeration efficiency of rotary compressors.

b. Conventional technology Reciprocating type compressors are used in refrigerators, ice makers, and other refrigerators with conventional configurations, but recently, configurations using rotary type compressors have begun to be proposed in order to save space. .

C0 Problems to be Solved by the Invention In general, rotary compressors have a structure in which the inside of the shell is on the high pressure side, so refrigeration oil (lubricating oil) is charged on the high pressure side, and when the compressor is stopped, If you leave it alone,
It is generally known that the refrigerant is mixed with the oil of the compressor and becomes stagnant. In this way, if the operation is started with the refrigerant trapped in the oil, the oil chamber of the compressor will not be depressurized like in the conventional reciprocating type, so the operation will start with the refrigerant trapped, causing problems during the refrigerant cycle. When there is a shortage of refrigerant (machines with a small amount of refrigerant charge have a large effect), the high pressure does not rise easily, and as a result of this high pressure being difficult to rise, the low pressure also drops extremely. At the same time, the amount of refrigerant circulating becomes extremely small due to the vacuum operation phenomenon.

Furthermore, one of the reasons why the compressor's high pressure rises slowly is that when the compressor is at room temperature, it has a large heat volume, so it cools the refrigerant gas, and because the inside of the compressor shell is on the high pressure side. This is due to the large amount of heat dissipated from the shell surface.

Due to the above-mentioned phenomenon, particularly when the ambient temperature is low, the cooling characteristics during the initial start-up operation are poor, resulting in a long-time freezing or ice-making operation, resulting in large energy losses. Furthermore, when ice-making operation is performed in the above-mentioned state, for example, the shape of the ice on the ice-making plate differs greatly between the inlet side and the outlet side of the evaporator, and this is because the low pressure becomes abnormally low from the time ice making starts.

The temperature on the evaporator inlet side (evaporation temperature) becomes extremely low,
On the other hand, the temperature on the outlet side does not decrease fundamentally, resulting in a superheated state with poor temperature balance between the inlet and outlet of the evaporator. As a result, the shape of the ice on the inlet side and the outlet side of the ice making plate was significantly different and skewed, resulting in an extremely low product yield.

The above phenomenon becomes more obvious as the machine surrounding (environment) temperature is lower, but it can sometimes occur even when the room temperature is around 700℃.
This occurrence at room temperature IOC exceeds the detection temperature of the deicing detection thermometer <ec~rC), which is used as a means to detect the completion of the conventional deicing cycle. Even if a cycle start is performed, the above problem cannot be solved. In other words, if the set temperature of the deicing thermometer is set high, the deicing time will be longer even during normal operation, resulting in time loss, and the low pressure during deicing may become abnormally high, causing the compressor There is a problem with the durability of.

In addition, rotary compressors have the advantage of being lighter and more compact than reciprocating compressors, but in ice makers that perform hot gas defrosting (removal of ice),
Although it is lightweight, it has a disadvantage of having a small heat volume. In other words, in the ice maker's de-icing cycle, the ice formed in the evaporator is heated to remove it from the ice-making chamber. During this de-icing cycle, the refrigerant gas is condensed and is sucked into the compressor as a large amount of liquid refrigerant. However, the compressor is cooled by this liquid refrigerant. In this case, the rotary type compressor, which has a smaller heat volume than the conventional reciprocating type compressor, cools down faster and has extremely weak hot gas power compared to the reciprocating type. Therefore, it will have a great negative effect on the deicing ability at low temperatures.

Means for solving the d0 problem The present invention provides an extremely suitable means for quickly eliminating the above-mentioned drawbacks. In particular, it improves the cooling capacity at the initial stage of refrigeration operation, and in the case of ice making machines, it improves the cooling capacity at low temperatures. The purpose is to prevent the ice shape from differing greatly between the inlet and outlet sides of the evaporator during the initial ice-making process, to prevent the initial ice-making cycle from becoming abnormally long, and to improve energy efficiency. The gist of this is a refrigeration system in which a rotary compressor, a condenser, a capillary tube, and an evaporator are connected in a series ring, and a bypass circuit is provided for returning hot gas from the compressor to the compressor. , a refrigeration system using a rotary compressor, which includes a detection unit for detecting the temperature or pressure of gas in the rotary compressor, and a control circuit unit for switching the refrigeration system to cooling operation or bypass operation. be.

00 action When the detected value such as temperature or pressure detected by the detection section is below a predetermined value, the control circuit section switches the refrigeration system to bypass operation and performs temperature raising operation of the rotary compressor, and then It performs cooling operation.

f. Embodiments Hereinafter, preferred embodiments of a refrigeration system using a rotary compressor according to the present invention will be described in detail with reference to the drawings.

Fig. 1 shows the refrigeration circuit section, and Fig. 1 shows the control circuit section, where the symbol l is a rotor 17 having a heat insulating material la on its outer surface - an expansion compressor (hereinafter referred to as a compressor). The first connecting means connected to the outlet pipe /b of this compressor is connected to a condenser J having a cooling fan, and this condenser J passes through a capillary 5 and an evaporator 6 to the above-mentioned It is connected to the inlet pipe /c of the compressor l via a first connecting means 7. A detection section g provided in the first connection means λ, which is a high-pressure pipe near the outlet pipe 1b, is connected to a switch device (consisting of a thermostat, electronic temperature switch, pressure switch, etc.), and this detection section g The refrigerant gas temperature or refrigerant gas pressure is detected, and the switch is operated in accordance with the detected value.

Further, one end of the hot gas pipe/co having a hot gas valve/l is connected to the first branch part 10 provided with the first connecting means 2Vc, and the other end of the hot gas pipe/co is connected to the first branch part 10 provided with the first connecting means 2Vc. and the evaporator 6, and this hot gas pipe constitutes a bypass circuit 13.
The first contact 9a of this switch is connected to the contacts /a and /jl) and the ice maker control circuit /j17c, and the contact /ja is connected in series to the hot gas valve //. In addition, the contact point IRB is connected in series to the cooling fan. The first contact v of the switch 9
b is connected in series to the hot gas valve 11, and the compressor l is connected to the power source via a water storage switch/6.

In the above configuration, a case will be described in which the refrigeration system according to the present invention is operated.

When the water storage switch/6 installed in the water storage (not shown) detects that there is no certain amount of ice in the water storage, the water storage switch/6 is turned on, the compressor/ starts operating, and the water storage switch/6 is turned on. Operation continues until it is turned off. At this time,
If the temperature or pressure, etc. of the detection part t of the switch is higher than the set value (in the case of temperature, 500 to l#0C), the second contact?
b is open and the first contact? a is turned on and the normal ice making cycle continues. However, if the temperature of the detection part g is below the set value, the first contact 9b is on, the hot gas valve // is opened, and the first bypass circuit 13 is opened. , compressor l, hot gas valve/
/ and the refrigeration system is switched to the hot gas circuit connected to the evaporator 6 to perform bypass operation. During cycle operation), the cooling fan that cools the condenser J is stopped, and the compressor is in bypass operation due to the heat generated by the compressor's motor and the heat generated by the refrigerant gas compression process. , the entire compressor 1 is heated, and the temperature can be effectively increased by combining with the heat retention effect of the heat insulating material 1a. In other words, this is due to the opening of the hot gas valve 11.
This is because even when the refrigerant gas pressure is low, the flow rate of the refrigerant is larger than that of the cavity 171, and the amount of work of the compressor also increases.

Therefore, when the temperature of the compressor increases (9%), the temperature or pressure of the refrigerant gas also increases, and the temperature or pressure of the detection part g exceeds the set value, the first contact ?a of the switch 9 turns on, 2
Contact vb is turned off and the ice making cycle begins again. At the time of starting ice making, the high pressure of the refrigerant is also at a normal value, so in the case of an ice making machine, ice with a good shape can be obtained from the first cycle of ice making.

In this embodiment, the detection section is installed on the high pressure side of the refrigeration circuit, but the same effect can be obtained even if the detection section is installed on the low pressure side to detect temperature and pressure.

Furthermore, the configurations of the refrigeration circuit section and control circuit section shown in FIG. 3 and FIG. , a bypass circuit 13 consisting of a bypass connecting pipe/circle having a bypass valve/l is provided for directly connecting the outlet pipe/b and the inlet pipe 1c of the compressor l, and the control circuit section l shown in FIG.
Unlike Hiroshi, only the bypass valve 17 has the second contact q.
Further, a reverse valve/de is connected between the evaporator 6 and the inlet pipe IC of the compressor l. This regurgitation valve l? The refrigerant heated when the bypass valve 17 is opened to raise the temperature of the compressor flows back through the large diameter connecting means 7, which is a low pressure pipe, and is cooled by the evaporator. Similar to the first embodiment, the bypass valve provided to prevent the above-described bypass valve has the same effect when using a valve that opens and closes depending on temperature or pressure. Refrigeration equipment can similarly improve cooling efficiency when used in either a refrigerator or an ice maker.

g9 Effects of the invention The refrigeration system using the rotary compressor according to the invention is as follows:
With the structure and operation described above, even if the compressor is at room temperature, the compressor is rapidly heated and the shell temperature is raised before moving to ice-making operation, so the high pressure is maintained in the normal cycle. This means that there is no extremely low pressure drop at the start of ice making, and in the case of an ice maker, the shape of the ice produced at the inlet and outlet of the evaporator does not differ, and the same shape of ice with high commercial value is produced. obtained, and the yield can be sufficiently improved. Furthermore, ice making operation can be performed within the normal ice making time from the first ice making cycle, improving energy efficiency. Furthermore, in refrigerators, air conditioners, car air conditioners, etc., the dehumidifying effect, defrosting effect, and cooling effect at startup can be rapidly improved, and a remarkable cooling effect can be achieved.

Brief explanation of the etiology The drawings are for showing a refrigeration system using a rotary compressor according to the present invention, and FIGS. 1 and 2 show a refrigeration circuit and control circuit showing the first embodiment, and FIG. Figures 1 and 1 are a refrigeration circuit and a control circuit showing the embodiment.

/ is a rotary compressor, 1a is a heat insulator, /b is an outlet pipe, 1c is an inlet pipe, ko is a first connection means, J is a condenser, Hiro is a cooling fan, j is a capillary, 6 is an evaporator, 7 is a connection means, g is a detection unit, 9 is a switch, /l is a hot gas valve, / is a hot gas pipe, 13 is a bypass circuit, /da is a control circuit, /! is the ice maker control circuit, /6 is the water storage switch, 17 is the bypass valve, /l is the bypass connection pipe, /9
is a regurgitation valve.

Figure 1 Figure 2 Figure 3 Figure 4

Claims (5)

[Claims] (1) A rotary compressor (1), a condenser (3), a capillary (5), and an evaporator (6) are connected in series in an annular manner,
In a refrigeration system having a bypass circuit (13) for returning hot gas from the compressor (1) to the compressor (1), detection for detecting the temperature or pressure of gas in the rotary compressor (1). A control circuit section (1) for switching the refrigeration system to cooling operation or bypass operation.
4), when a detected value such as temperature or pressure detected by the detection section (8) is below a predetermined value, the bypass circuit (
13) A refrigeration system using a rotary compressor configured to perform a cooling operation after performing a temperature increasing operation of the rotary compressor. (2) The rotary compressor according to claim 1, wherein the temperature increasing operation is achieved by a bypass cycle operation in which a hot gas valve (11) in the bypass circuit (13) is opened. Refrigeration equipment using a machine. (3) The temperature increasing operation is controlled by detecting the temperature or pressure of the refrigerant during the bypass cycle operation by the detection unit (8), and controlling the temperature increasing operation on and off. A refrigeration system using the rotary compressor according to claim 1. (4) A heat insulating material (
1a) A refrigeration system using a rotary compressor according to claim 1. (5) Outlet pipe (1b) of the rotary compressor (1)
and the inlet pipe (1c).
7) A refrigeration system using a rotary compressor according to claim 1.