JPS6246152A - Air-conditioning machine - Google Patents

Abstract

PURPOSE:To prevent reduction of room temperature during defrosting operation by a method wherein an inverter control unit, inputting the signal of a defrosting condition detector for an outdoor heat exchanger and rising the revolving number of a compressor and the set room temperature of a room temperature detector before starting defrosting operation, is provided. CONSTITUTION:The constitution of a circuit is added with a micro-computer (hereinafter referred to micon) 16, the room temperature detector 17 and a waveform shaping unit 18. The detecting signal of the defrosting condition detector 10 is inputted into the input terminal IN1 of the micon 16 while the detecting signal of the room temperature detector 17 is inputted into the input terminal IN2 of the same. The waveform shaping unit 18 is connected between the terminals 15 of a control electric source and controls the revolving number of the compressor 1 by the output signal of output terminal OUT2 of the micon 16. The revolving number of the compressor 1 is increased by the inverter control unit inputting the signal of the defrosting condition detector 10 and when the increased temperature has been achieved, the defrosting operation is started. According to this method, the reduction of room temperature during defrosting operation may be prevented without complicating the device.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an air conditioner that defrosts frost adhering to an outdoor heat exchanger during heating operation.

[Conventional technology]

Figures 6 and 7 are for example Utility Model Application No. 57-490393
They are a refrigerant circuit diagram of a conventional Bee 1-pump type air conditioner shown as a conventional example in the publication, and an electrical throttling circuit diagram during defrosting. In FIG. 6, 1 is a compressor, 2 is a four-way valve, 3 is an indoor heat exchanger, 4 is a pressure reducing device, and 5 is an indoor heat exchanger. These compressor 1, four-way valve 2, indoor heat exchanger 3, pressure reducing device 4, and outdoor heat exchanger 5 are connected in an annular manner by a refrigerant pipe 6 to form a refrigerant circuit 7 through which refrigerant passes. Further, an indoor fan 8 is disposed opposite to the indoor heat exchanger 3, and an outdoor fan 9 is disposed also in the outdoor heat exchanger 5. A defrosting condition detector 10 whose temperature sensing portion is in contact with the inlet pipe of the outdoor heat exchanger 5 is disposed. Defrost condition detector 1
0 outputs a detection signal, contacts 11a and llb of the switching contact 11 shown in FIG. 7 are switched. The contact 11a of this switching contact 11 is normally closed,
When the defrosting condition detector IO outputs a detection signal, contact 11
It is designed to close b. The contact 11a is connected to one of the control power terminals 15 via the drive coil 2a of the four-way valve 2 and one contact of the heating switch 13. Similarly, the contact 11b is connected to one of the control power terminals 15 via the other contact of the relay 12 and the switch 13. A movable contact of the switching contact 11 is connected to the other control power terminal 15. A normally closed contact 12a of the relay 12 is connected between the control power terminals 15.
, indoor fan 8, and air blowing speed switch 14 are connected in series. Next, the operation will be explained. During heating, the heating switch 13 is closed, the drive coil 2a of the four-way valve is energized, and the four-way valve 2 is operated in a heating cycle. As a result, the high-temperature, high-pressure gas discharged from the compressor 1 passes through the four-way valve 2 as shown by the arrow, is cooled by the forced ventilation of the indoor fan 8 in the indoor heat exchange type 3, and becomes condensed liquid in the pressure reducing device 4. The refrigerant expands adiabatically and becomes a low-pressure refrigerant, which is heated by the forced ventilation of the outdoor fan 9 in the outdoor heat exchanger 5 and evaporates, becoming a low-pressure gas that passes through the four-way valve 2 and is sucked into the compressor 1. As the outside temperature decreases, the heat scene sucked up from the outdoor heat exchanger 5 into the refrigerant circuit Is7 decreases, and when the evaporation temperature decreases and becomes below the zero point temperature, frost will form on the outdoor heat exchanger 5. However, as a result, the ability to absorb heat decreases, and the input pipe temperature of the outdoor heat exchanger 5 further decreases.
The temperature is below the set temperature. This temperature is detected by the misting condition detector 10, and by opening the contact 11a of the switching contact 11°, the excitation of the drive coil 2a of the four-way valve is released, the four-way valve 2 is switched, and the refrigerant circuit 7 is put into cooling operation. becomes. At the same time, the relay 12 is energized by closing the contact 11b, and its normally closed contact 12a is opened, stopping the indoor fan 8 from blowing air, thereby preventing cold draft to the occupants. At this time, one of the blower speed switches 14 is turned on. In this way, by switching the four-way valve 2 and entering cooling operation, the high temperature and high pressure refrigerant gas discharged from the compressor 1 is
After passing through the switched four-way valve 2, the outdoor heat exchanger 5
The heat from the refrigerant melts the frost that has adhered to it. When the temperature of the temperature-sensing part of the defrosting condition detector 10 rises with the end of defrosting, the contact 11a of the switching contact 11 closes and the contact 11b opens, and the drive coil 2a of the four-way valve 2 is energized again. Valve 2 switches and returns to heating operation.

[Problems to be solved by the invention]

However, in the conventional air conditioner described above, heating is not performed for a while during the defrosting operation and after returning to the heating operation, and the indoor temperature decreases, causing discomfort to the occupants. The present invention was made to solve this problem, and an object of the present invention is to provide an air conditioner that can control the room temperature setting so as not to lower the indoor temperature during defrosting operation.

[Means to solve the problem]

The air conditioner according to the present invention includes an inverter control section that receives a signal from a defrosting condition detector of an outdoor heat exchanger as input and increases the rotation speed of the compressor and the set room temperature of the room temperature detector before starting defrosting. It is something that

[For use]

In this invention, the rotation speed of the pressure w1 machine is increased by the inverter control section before the start of defrosting as a signal input to the defrosting condition detector, and when the upper limit temperature is reached, the defrosting operation is started. It acts to cause

【Example】

Embodiments of the air conditioner of the present invention will be described below based on the drawings. FIG. 1 is an electrical circuit diagram of one embodiment. In FIG. 1, parts that are the same as those in FIG. 7 are given the same reference numerals, and a description of the structure thereof will be omitted, and the explanation will mainly focus on the parts that are different from FIG. 7. In FIG. 1, a microcomputer (hereinafter referred to as microcomputer) 16, a room temperature detector 17, and a waveform shaping section 18 are newly added to the circuit configuration of FIG. That is, the microcomputer 16 has input terminals INI and IN2, output terminals 0UTI and 0UT2, and has a program ROM and data RAM 5ALU (arithmetic unit) inside. The defrosting condition detector 1 is connected to the input terminal INI of the microcomputer 16.
A detection signal of 0 is allowed to be input. This defrosting condition detector 10 is the same as that shown in FIG. In addition, a room temperature detector 1 is connected to the input terminal IN2 of the microcomputer 16.
7 detection signals are input. The room temperature detector 17 detects the room temperature of the living room. The microcomputer 16 reads the detection signals input to these input terminals INI and IN2 and outputs an output signal from the output terminal OUT 1 to the switching contact 11 that performs defrosting operation, and also outputs an output signal from the output terminal 0UT2. An output signal is output to the waveform shaping section 18. This waveform shaping section 18 is connected between the control tjE power supply terminals 15, and controls the rotation speed of the compressor 1 based on the output signal from the output terminal 0UT2 of the microcomputer 16. This waveform shaping section 18 is a device for driving a general induction motor. Next, the operation of this embodiment will be explained with reference to FIGS. 2 and 3. FIG. 2 is a flowchart showing the operation contents of the microcomputer 16 operated by the detection signal of the defrosting condition detector 10, and FIG. 3 shows its control section. First, at step 20 in FIG.
When the NI command is input, the process moves from step 21 to step 22, where the rotational speed of the compressor 1 is increased by ΔF as shown in FIG. Please give this command and continue heating operation. Then, the room temperature detector 17 sets the newly set room temperature (T
+ΔT), the process moves from step 24 to step 25, and defrosting operation is started. This defrosting operation process is the same as the conventional one, but in step 26, the pressure wI machine 1 is operated at a rotation speed F2 specially designated in the defrosting operation mode. Next, the defrosting condition detector 10 finishes defrosting and outputs the detection signal to the input terminal INI of the microcomputer 16, and the process moves from step 27 to step 28, returning to the original heating operation. The process of completing defrosting and returning to the original heating operation is the same as before. Next, in step 29, the rotation speed of the compressor 1 is set to F3 (Fig. 3), which is arbitrarily determined in the heating operation mode, and in step 30, the original setting room 6T is specified to the room temperature detector 17. and return to the initial heating operation state. Immediately before the start of defrosting operation, the rotation speed of the compressor 1 increases by ΔF to (Ft + ΔF), and the room temperature increases by ΔT (T + ΔT).
), but immediately after the defrosting operation ends, the room temperature does not drop below the original WT. The settings of the increased rotational speed ΔF of the pressure tfJ machine 1 and the increased temperature ΔT of the room temperature detector 10 may be arbitrarily changed according to the indoor load. In the above embodiment, the rotation speed of the compressor 1 is increased to (F++ΔF) immediately before the start of the defrosting operation, and the indoor temperature is raised to (T+
ΔT), but after the rotation speed of the pressure wJ machine 1 and the room temperature setting are increased, the defrosting operation is started after a certain period of time ΔS has elapsed in the diagram showing the time change of the room temperature in Figure 5. Even in control, the same effects as in the above embodiments are achieved. A flowchart showing the operation in this case is shown in FIG. In this FIG. 4, even if the room temperature does not reach the set room temperature (T + △T) in step 24, after the room temperature setting has been increased, 65
When the time has elapsed, step 31 enters the defrosting operation of step 25. The time S may be set to a time when the upper limit of the room temperature increases frost formation on the outdoor heat exchanger 50 and the heating capacity is extremely reduced.

【Effect of the invention】

As explained above, this invention increases the rotational speed of the compressor to raise the room temperature before starting the defrosting operation, and when the increased temperature is reached, the fogging operation starts, so that the device can be operated. It is possible to prevent the room temperature from dropping during defrosting operation without making it complicated, and it is effective in providing a comfortable living space.

[Brief explanation of the drawing]

Fig. 1 is an electrical control circuit diagram during defrosting in an embodiment of the air conditioner of the present invention, Fig. 2 is a flowchart showing the flow of operation of the electrical control circuit in the same air conditioner, and Fig. 3
Fig. 4 is a flowchart showing the operation flow of the electric control circuit of another embodiment of the air conditioner of the present invention, and Fig. 5 is a diagram of the change in room temperature of the air conditioner according to the above embodiment. FIG. 6 is a diagram of changes in room temperature over time, FIG. 6 is a refrigerant circuit diagram of a conventional air conditioner, and FIG. 7 is an electrical control circuit diagram of a conventional air conditioner during defrosting. 1 compressor, 2 four-way valve, 2a four-way valve drive coil,
3 indoor heat exchanger, 4 pressure reducing device, 5 outdoor heat exchanger, 6 refrigerant piping, 7 refrigerant circuit, 8 indoor fan, 9
Outdoor fan, 10 defrosting condition detector, 11 switching contact, 12 relay, 13 heating switch, 16 microcomputer, 17 room temperature detector, 18 waveform shaping section. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa (and 2 others) Fig. 1 12F Shinatsugu 12: SO L-18, Sucking beast moza Fig. 2 Fig. 4 Fig. 6 Fig. 7 Town 0 Inventor Matsuoka Yu Fumi Kamakura City Ofuna 2
] 8-1-1 Mitsubishi Electric Corporation Chuo Research Center 14-4 Mitsubishi Electric Corporation Product Research Institute Procedural Amendment (Voluntary) Showa Year Month Day 1, Incident Indication Patent Application No. 184905 No. 1884-2,
Title of invention Air conditioner 30. Relationship with the person making the amendment Patent applicant address 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Mitsubishi Electric Corporation Representative Moriya Shiki 4o Agent address 2-chome Marunouchi, Chiyoda-ku, Tokyo 2 No. 3 No. 5
, Subject of amendment (1) Column 6 of detailed explanation of the invention in the specification, ? ltlCorrect contents (1) On the 10th line of page 2 of the specification cylinder, "5 is the indoor heat exchanger"
The statement "5 is an outdoor heat exchanger" is corrected. (2) On page 7, line 12, the statement ``17 is in the living room'' is corrected to ``17 is in the living space.''

Claims (2)

[Claims] (1) A refrigerant circuit configured to connect a compressor, a four-way valve, an indoor heat exchanger, a pressure reducing device, and an outdoor heat exchanger in a ring shape through refrigerant piping to allow refrigerant to pass therethrough; room temperature detection for detecting indoor temperature; a defrosting condition detector for detecting the defrosting conditions of the outdoor heat exchanger; a detection signal from the defrosting condition detector increases the rotational speed of the compressor before starting the defrosting operation and detects the room temperature; An air conditioner equipped with a means to raise the set room temperature of the device. (2) The means for increasing the rotation speed of the compressor and the set room temperature of the room temperature detector is controlled so that the defrosting operation is started after a predetermined time has elapsed from the time when the determination is started. Air conditioner as described in section.