JPS5895138A - Heat pump type air conditioner - Google Patents

Abstract

PURPOSE:To improve efficiency by defrosting at the time of build-up of heating in the following morning, by so constituting that a defrosting operation is made to do forcibly for a fixed period of time directly after starting of a heating operation. CONSTITUTION:When a heating operation is started at a point B1 a defrosting operation is made to do up to a point B2 for a fixed period of time irrespective of a temperature of an outdoor heat exchanger, and then a heating and a defrosting operations are carried out through a variation of the temperature and a time of the outdoor heat exchanger. Defrosting can be done more sufficiently when a device is so constituted that during the defrosting operation up to the point B2 the temperature 13 of the outdoor heat exchanger is sensed and the defrosting operation is made to do until a temperature 11 for completion of the defrosting. When the point B1 is in an atmosphere which is more than the temperatue for completion of the defrosting, the defrosting operation at the time of build-up of heating is not carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat pump type air conditioner.

A conventional heat pump type air conditioner will be explained with reference to FIG. 1, FIG. 2, and FIG. FIG. 1 is a refrigeration cycle system diagram of a heat pump air conditioner, in which solid arrows indicate the flow direction of refrigerant during heating operation, and dashed arrows indicate the flow direction of refrigerant during cooling operation. FIG. 2 shows the operating state of heating operation in the refrigeration cycle system diagram of FIG. 1.

In FIG. 1, 1 is a compressor, 2 is a four-way valve that switches the flow of refrigerant during cooling and heating, and 6 is an indoor heat exchanger, which functions as an evaporator during cooling and as a condenser during heating. 4 is an outdoor heat exchanger, which acts as a condenser during cooling and as an evaporator during heating.

Reference numeral 5 designates a cavity retriever that operates during cooling, and 6 designates a cavity retriever that operates during heating. 7 is a check valve;
This allows the refrigerant to flow in only one direction. In FIG. 1, during cooling, the refrigerant flows as indicated by the dashed arrow, and a well-known cooling operation is performed. Also, during heating, the four-way valve 2 is switched to flow the refrigerant in the direction of the solid arrow to perform heating operation. When the heating operation is performed, the box adheres to the outdoor heat exchanger 4. Particularly in low temperature and high humidity, the amount of adhesion increases. Therefore, the amount of heat absorbed by the outdoor heat exchanger 4 decreases, and the heating capacity decreases. Therefore, the conventional heat pump type air conditioner melts the sardine adhering to the outdoor heat exchanger 4. That is, in the defrosting operation, the four-way valve 2 is switched and operated in a cold Jyt cycle to flow high temperature refrigerant to the outdoor heat exchanger 4 to melt the frost.

This defrosting 'J◆ rotation during heating is controlled by the temperature of the outdoor heat exchanger 4 and the heating operation time. FIG. 2 shows the B net period during heating, where AI is the starting point of heating operation, A2. A4 is the start point of the defrosting operation, and A3 and A5 are the end points of the defrosting operation. 8 and 9 indicate temperature changes in the outdoor heat exchanger 4, 10 is the defrosting operation start temperature, and 11 is the defrosting operation end temperature. A2 for a certain period of time after heating operation starts
In the timing switch, even if the temperature of the outdoor heat exchanger 4 drops as shown in 9, the defrosting operation is prohibited and the heating operation is forced.
The rise characteristics during heating are taken into account. After that, use an outdoor heat exchanger. However, when the heating operation is stopped at point A6, frost has adhered to the outdoor heat exchanger 4. If you start heating operation the next morning in this state,
Since the defrosting operation is not performed until the point A2 for a certain period of time, the amount of frost adhering further increases, the amount of heat absorbed by the outdoor heat exchanger 4 decreases, the heating capacity decreases, and the heating operation becomes inefficient. Therefore, especially on cold mornings, the heating of the room was delayed, causing discomfort to the people in the room. Another drawback was that the timer mechanism for automatically starting the heating operation was not utilized effectively.

An object of the present invention is to provide a heat pump type air conditioner that efficiently heats air by melting frost that has formed on an outdoor heat exchanger at the end of heating operation before starting heating operation the next morning.

In other words, the frost that had formed on the heat pump air conditioner at the end of the heating operation is forced to defrost for a certain period of time immediately after the heating operation starts the next morning to melt it, and then the heating operation is started. It heats up the room quickly.

An embodiment of the present invention will be described below with reference to FIG. 1.6. The same reference numerals as in the conventional example indicate the same parts. B1 is the starting point of the heating operation, and is also still the starting point of the defrosting operation. B2. B4.
B6 is the end point of the defrosting operation, B6 and B5 are the starting points of the defrosting operation, and B7 is the stop of the heating operation. 12.13 is the temperature change of the outdoor heat exchanger. When the heating operation is started at point B1, first, the defrosting operation is forcibly performed for a certain period of time up to B2, regardless of the temperature 12 of the outdoor heat exchanger. After that, heating operation or defrosting operation is performed depending on the temperature change of the outdoor heat exchanger 4 and the time. When the heating operation is stopped at the 87th point, there is frost on the outdoor heat exchanger 4, but when the heating operation is started the next day, the defrosting operation is forced to the 82nd point and the outdoor heat exchanger 4 is cooled. Heating operation is performed after the frost has melted. In addition, the defrosting time up to point B2 is determined by sensing the temperature 13 of the outdoor heat exchanger, and by detecting the defrosting end temperature 11.
If you do this for any amount of time until it reaches , you can sufficiently melt the frost. Of course, the temperature of the outdoor heat exchanger 4 is B
When the defrosting operation end temperature at one point is 11 or higher, the heating operation is started from the 52° point without performing the defrosting operation. Furthermore, in a heat pump air conditioner with a timer mechanism that can automatically start heating operation, if the timer set time is the same as point B2, the net heating time and the timer set time will match. I can do it.

As described above, according to the present invention, since the frost adhering to the outdoor heat exchanger is melted before heating operation is performed the next morning, the heating operation is performed, so that the amount of heat absorbed by the outdoor heat exchanger 4 is not reduced. Enables efficient heating operation. Because of this, there is no delay in warming up the room, especially on cold mornings, and it does not cause discomfort to the people in the room. Also, heating operation will start automatically.

The timer mechanism can also be used effectively.

According to the present invention, in a heat pump 7 air conditioner, frost adhering to the outdoor heat exchanger 4 is automatically removed for a certain period of time or by temperature change 13 of the outdoor heat exchanger 4 before heating operation is performed the next morning. Accordingly, a timer mechanism that automatically starts the heating operation is used to melt the frost before starting the heating operation, which enables efficient heating operation and has the effect of speeding up the warming of the room.

[Brief explanation of the drawing]

Figure 1 is a refrigeration cycle system diagram of a heat pump air conditioner, Figure 2 is a diagram of the heating and defrosting operation of Figure 1, and Figure 6 is a diagram of the heating and defrosting operation state of Figure 1.
The figure is a diagram of the heating and defrosting operation according to the present invention shown in FIG. 1. 1... Compressor, 2... Four-way valve, 5... Indoor heat exchanger, 4... Outdoor heat exchanger, 5... Capillary tube for cooling, 6... Capillary tube for heating -B, 7...
Check valve, 8/9...Temperature change curve of outdoor heat exchanger, 1
0...Defrosting start temperature, 11...Defrosting end temperature, 12
・13...Temperature change curve of outdoor heat exchanger.

Claims (1)

[Claims] 1. Compressor (1), four-way valve (2), indoor heat exchanger (3)
,'! External heat exchanger (4), cooling capillary tube (
5) In a heat pump type air conditioner that connects a heating capillary tube (-6), a check valve (7), etc. in sequence, the defrosting operation is automatically performed for a certain period of time immediately after starting the heating operation. 2. A patent claim that detects the gear of the outdoor heat exchanger (4) and performs defrosting operation until the temperature of the outdoor heat exchanger (4) reaches a certain temperature or higher. A heat pump air conditioner according to scope 1. 6. The heat pump air conditioner according to claim 1, wherein the defrosting operation is automatically performed a certain period of time before the heating operation is started.