JPS6014073A - Air conditioner - 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 relates to an air conditioner, and particularly to an air conditioner suitable for conditioning the air in a room in which goods to be transported, called a refrigerated container, are stored.

An example of a conventional air conditioner for a refrigerated container is shown in Fig. 1, where (10) is a chamber in which goods to be transported are stored, and indoor air is supplied by a blower (12+) as indicated by the white arrow in the figure. As shown, the refrigerant gas is circulated through the evaporator (4) and the heater 0υ. (1) is a refrigerant compressor, and the high temperature and high pressure refrigerant gas discharged from the refrigerant compressor (1) is circulated through the condenser (2). I entered the room and was cooled down.

It is condensed and liquefied, then enters the throttle (3) where it also expands adiabatically, and then enters the evaporator (4) where it becomes a chamber (I).
The air circulating through I is cooled, and the air itself is heated and evaporated into gas, returning to the compressor (1). Compressor (1)
By opening the valve (5) during operation, a portion of the high-temperature, high-pressure refrigerant gas discharged from the compressor (1) bypasses the condenser (2) and the throttle (3) and radiates heat. The cooling capacity of the evaporator (4)K can be reduced, and the cooling capacity can be controlled steplessly by adjusting the opening degree of the valve (5).

(8) is a temperature sensor that detects the temperature of the return air (6) from the room (all I), (9) is the evaporator (4), and the heater aI
) is a temperature sensor that detects the temperature of the blown air (7) that is cooled or heated through the temperature sensor selection means. When this signal is sent to the temperature sensor (9)
It is selected to use the temperature of the return air (6) detected by the temperature sensor (8) in response to the signal of the air temperature detected by the temperature sensor (8) for control.

A is a deviation calculating device that compares the detected temperature selected by the temperature detector selection means (14) with the set temperature set by the temperature setting means a9, calculates the deviation between the two, and calculates the deviation between the two, and calculates the deviation between the two. Output to (b). αη is a thermostat selection means, and when the set temperature set by the temperature setting means αω is the refrigeration condition, upon receiving this signal, the refrigeration thermostat is selected.
18), and when the set temperature is in the freezing condition, receives this signal and selects the freezing thermostat (1!1).The operation instruction device (20) compares the deviation output from the deviation calculation device Q (to). Thermostat selection means
The compressor (
1) Issue a command to operate the valve (5), heater (11), and blower a4.

When storing frozen products in a room GO) and maintaining the room temperature below -18°C, set the temperature setting means (15) to -18°C.
When set, the temperature sensor selection means I selects the temperature sensor (8) based on the signal from now on, and the thermostat selection means Qη selects the refrigeration thermostat) (1→.The temperature detected by the temperature sensor (8) The detected temperature of the return air (6) is the set temperature set by the temperature setting means 09, that is, -18.
℃, this deviation is input to the operation instruction device (a) via the deviation calculation device aω, where it is compared with the deviation set at refrigeration thermostat) (19), and if the former is greater than the latter, , Start the refrigerant compressor (1) and the air blower m (1'2+) according to the instructions from the operation instruction device (a),
The air circulating in the chamber (10) is cooled by the evaporator (4). When the air temperature decreases and the deviation between the detected temperature and the set temperature becomes equal to or less than the deviation set in the refrigeration thermostat a9, the refrigerant compressor (11) is stopped by the instruction from the operation instruction device (201), and the above-mentioned By repeating starting and stopping, the temperature inside the room aO) is maintained at -18° C. set by the temperature setting means α9.

Further, in order to store refrigerated items in the room GO), when the temperature setting means a5 is set to, for example, 0°C, the temperature sensor selection means (14) selects the temperature sensor (9), and the thermostat selection means αD select the refrigerator thermostat)Q8). The blown air detected by the temperature detector (9) (if the detected temperature of the force is higher than the set temperature, that is, 0°C, this deviation is the refrigeration thermostat) (if the deviation is greater than the deviation set in Igl, the operation instruction device (20 ), the compressor (1) and blower a2 are driven to cool the air, the temperature inside the room (10) drops, and the deviation between the detected temperature and the set temperature becomes the refrigeration thermostat (18). When the deviation is below the set value, the valve (5) is opened in response to an instruction from the operation instruction device (20) to reduce the cooling capacity of the evaporator (4). After that, while continuing to operate the compressor (1), the valve (
The cooling capacity of the evaporator (4) is adjusted by adjusting the opening degree of the operation instruction device 4J (21) 5) according to instructions from the l.
When the heat load of the room 00) exceeds the limit set by the valve (5), the heater (11) is energized according to the instruction from the operation instruction device (20) to reduce the heat load of the housework and the evaporator ( 4) Maintaining equilibrium with the cooling capacity. In addition, if the deviation between the detected temperature and the set temperature is less than the deviation set in the refrigeration thermostat (18), the heater (11) and air blower ma2) are started without starting the compressor (1). This heats the circulating air, and starts the compressor (1) when the temperature in the room a0 rises and the deviation between the detected temperature and the set humidity exceeds the set deviation by the refrigeration thermostat Q81.

In the above conventional device, the compressor (1) is constantly operated during refrigeration.
The cooling capacity is continuously increased and decreased by steplessly increasing and decreasing the opening of the valve (5), and highly accurate temperature control is performed to minimize fluctuations in the air temperature inside the chamber Oα. ing.

Therefore, even when the compressor (1) does not need to be operated, such as when the heat load in the room a0 decreases during refrigeration or when the air temperature in the room (10) needs to be heated, the compressor (1) is always operated. Since the operation continues and the power for driving the compressor (1) is wasted, there is a problem that energy consumption efficiency is poor.

In order to deal with the above problems, the present invention includes at least two temperature detectors for detecting the temperature of the air inside the refrigerator compartment cooled by the cooling device, extracts two or more representative outputs from the temperature detectors, and extracts the two or more representative outputs from the temperature detectors. An air conditioner characterized in that the representative output used to start and stop the cooling device and the representative output used to control the cooling capacity of the cooling device are separate, the purpose of which is to When the air in the refrigerator room needs to be cooled, highly accurate temperature control is performed by adjusting the cooling capacity. By stopping the operation of
This aims to reduce power consumption due to wasteful operation of the cooling device and improve energy consumption efficiency.

The present invention will be specifically described below with reference to an embodiment shown in FIG. In Figure 2, (22) is a refrigerating thermostat), (2,1) is a freezing thermostat, (
C) is a driving instruction device.

During freezing, that is, when the set temperature set in the temperature setting means α9 is under the freezing condition, the deviation between the detected temperature of the temperature sensor (8) and the set temperature is similar to the conventional one shown in FIG. This is compared with the setting deviation set in the refrigeration thermostat H4), and depending on the comparison result, the operation instruction device (25) instructs the compressor (1) to operate and stop.

During refrigeration, that is, when the set temperature set in the temperature setting means is the refrigeration condition, for example, o'c, control is performed as follows. Temperature detector selection means (14)) Temperature detector (8)
and (9), and the thermostat selection means αη selects the refrigeration thermostat (22). The deviation calculation means aO calculates the deviation between the detected temperature of the temperature sensor (87) and the set temperature, 0°C, set in the temperature setting means αω, and also calculates the deviation between the detected temperature of the temperature sensor (9) and the set temperature. Temperature ℃
The difference between the two is also calculated. Deviation calculation means (when the deviation between the detected temperature of the temperature detector (8) calculated at t61 and the set temperature of 0°C exceeds a predetermined deviation set in the refrigeration thermostat 4, an operation instruction is given.

The compressor (1) starts operating according to a command from the device (c), and the air circulating in the room GO) is cooled by the evaporator (4).

As a result of this cooling effect, the temperature detected by the temperature sensor (8) and
When the deviation from the set temperature of 0°C reaches a predetermined deviation set in the refrigeration thermostat (2), the operation instruction device (25+) issues a command to the valve (5) to open the cooling device. The cooling capacity is reduced.The opening degree of the valve (5) is
Temperature detector (9) calculated by deviation calculation device (16)
Proportional control is performed so that the difference between the detected temperature and the set temperature becomes a predetermined value. As the operation continues in this state, the temperature in the room (10) further decreases, and the deviation between the temperature detected by the temperature detector (8) and the set temperature increases.
When the hot water reaches a set value, for example zero, the operation instruction device (25) instructs the compressor (1) to stop its operation, and also instructs the valve (5) to close. Let's do it. During this cessation of cooling action, the blower (12+
The temperature of the chamber (aO) increases due to the power required to operate the chamber (10), heat intrusion into the chamber (10) from the outside, etc., and the temperature sensor (8) increases.
) and the set temperature exceeds the deviation set in the refrigeration thermostat (22+), the operation instruction device (25) commands the compressor (1) to start operating again and also closes the valve. (5) is instructed to open the valve, and the cooling operation is restarted.By repeating the above actions, the temperature in the chamber (10) is maintained almost constant.Meanwhile, the outside air temperature decreases. When the temperature in room ao decreases even though the compressor (1) is stopped, the deviation between the temperature detected by the temperature sensor (81 and the set temperature) is detected.
When the value falls below the negative deviation set in the refrigerator thermostat (22) and becomes even more negative, the heater (Il+) starts to be energized, and the heater (11) and the blower (12) are energized.
A heating operation is performed by operation 1. As a result of this heating operation, when the deviation between the temperature detected by the temperature detector (8) and the set temperature exceeds a predetermined deviation set in the refrigeration thermostat (22), the power supply to the heater a11 is stopped.

As a result of the above operations, the temperature of the chamber GO) is maintained at a substantially constant temperature.

Therefore, in the above embodiment, during refrigeration, the compressor (1) is operated/stopped using the temperature detected by the temperature detector (8), and the opening/closing of the valve (5), that is, the control of the cooling capacity is controlled by the temperature. This can be done using the temperature detected by the detector (9). In this way, when the load on the chamber aO decreases during refrigeration, or when it is necessary to heat the silver inside the chamber (10), the operation of the compressor (1) can be controlled using the temperature detected by the temperature sensor (8). By stopping the compressor (1), wasteful power consumption of the compressor (1) can be reduced and energy consumption efficiency can be improved.

In addition, in the above embodiment, the refrigeration thermostat 0
When using the valve (5), the opening degree of the valve (5) is determined by the temperature sensor (
Although 5 proportional control was performed so that the difference between the detected temperatures in 8) and (9) was constant, this does not necessarily have to be a constant temperature difference. In addition, instructions to start and stop the compressor (1) are given to the return air (6
), and when controlling the cooling capacity of the cooling device, the temperature detected by the temperature sensor (9) that detects the temperature of the blown air (7) is used to control the cooling capacity of the cooling device. The opening degree of the valve (5) may be adjusted so that the temperature is lower than the set temperature by a predetermined temperature.

In addition, in the above embodiment, if used for temperature control, it is possible to use the higher value, the lower value, or even the average value of both, which is different from simply using only one of them for temperature control. Combination use is also possible.

Furthermore, in the above embodiment, as an example of controlling the cooling capacity of the cooling device, an example was shown in which the bypass amount of hot gas was controlled. The cooling capacity may be controlled by controlling the amount of circulating refrigerant by setting a variable throttle device or by controlling the amount of circulating refrigerant.
1) Capacity control of itself

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an example of a conventional air conditioner for a refrigerated container, and FIG. 2 is a system diagram showing an embodiment in which the present invention is applied to a refrigerated container. Cooling device・・・(1)(2)(3n(4)(51)
, Temperature detector...(819), Refrigerator room...aω. Sub-agent Patent attorney Shige Okamoto Three outsiders Figure 1 Figure 2 Figure 2 24 Amendment of procedure January 11, 1980 Commissioner of the Japan Patent Office Kazuo Wakasugi 1, Indication of the case 1988 Patent application No. 120301 2, Title of the invention Air conditioner OJ system 3, Relationship with the case of the person making the amendment Patent applicant name (620) Mitsubishi Heavy Industries, Ltd. 4, Sub-agent specification (1) Page 3 Correct "selected detected temperature" in the 3rd and 4th lines to "detected temperature of selected temperature sensor (8) or (9)". (2) Page 3, lines 18 to 19, “The room temperature...
...Temperature setting means" is corrected to "For example, temperature setting means when maintaining the room temperature below a predetermined temperature." (3) On page 10, lines 19 and 20, change “Temperature sensor......detected temperature” to “Temperature sensor (9)”.
The detected temperature and set temperature are corrected. (4) “This is...” from the first line to the second line of the 11th purchase.
...Also," is corrected to "This does not necessarily have to be the temperature difference from the set temperature.In other words,". (5) Change the “Set temperature” on page 11, line 6 to “Temperature detector (
8) Detected temperature”.

Claims (1)

[Claims] At least two or more temperature detectors are provided for detecting the temperature of the air in the refrigerator compartment cooled by the cooling device, and two or more representative outputs are extracted from the temperature detectors, and representative outputs are used to operate and stop the cooling device. and a representative output used for controlling the cooling capacity of the cooling device are separate.