JPS61223456A - Auxiliary heater controller for heat pump type 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 Field of Industrial Application The present invention relates to an auxiliary heater control device for a heat pump type air conditioner.

BACKGROUND OF THE INVENTION Conventionally, heat pump air conditioners have a heating capacity that decreases when the temperature drops during heating.

For this reason, an auxiliary electric heater is often provided to supplement the heating capacity. In other words, for a heat pump refrigeration cycle whose main components are a compressor, four-way valve, outdoor heat exchanger, expansion mechanism, and indoor heat exchanger, an auxiliary heater is installed on the windward side of the indoor heat exchanger, and when heating The operation switch for the auxiliary heater is turned on by manual operation to compensate for the lack of heating capacity caused by the heat pump refrigeration cycle. The heat pump type refrigeration cycle is equipped with a high-pressure pressure regulating valve (DPR), and when the discharge pressure from the compressor exceeds a predetermined set pressure value, the high-pressure pressure regulating valve is opened and the refrigerant is bypassed from the discharge side to the suction side. and lower the discharge pressure. In addition to the pressure reduction device of the refrigeration cycle, a high-pressure switch is provided that stops the compressor if the pressure becomes abnormal, to prevent the discharge pressure from reaching a value dangerous to the product.

Problems to be Solved by the Invention In such a conventional configuration, an electric auxiliary heater is provided on the windward side of the indoor heat exchanger, and a high-pressure pressure regulating valve and a high-pressure pressure switch are provided in the refrigeration cycle to increase the pressure Ii.
! We are trying to protect the machine and compensate for the uncertain heating capacity.
Since the auxiliary heater is used on the windward side of the indoor heat exchanger, the discharge pressure tends to increase, which is exacerbated by the need for protection devices such as the high-pressure switch, and the capacity of the auxiliary heater also increases. Limited to certain values. That is, the capacity of the auxiliary heater is limited to a small one so that overload operation does not occur immediately. Along with this, there is a problem in that the efficiency of the heat pump decreases as the number of times the refrigerant is bypassed from the discharge side to the suction side increases. The reason for providing the auxiliary heater on the windward side is to prevent the resin grill from deforming.

The present invention solves these problems and aims to protect the heat pump type refrigeration cycle during heating, regardless of the capacity of the auxiliary heater.

Means for Solving the Problems In order to solve this problem, the present invention provides a heat pump type refrigeration cycle in which a compressor, a four-way valve, an outdoor heat exchanger, an expansion mechanism, an indoor heat exchanger, etc. are sequentially installed, and It is equipped with an auxiliary heater installed on the windward side of the indoor heat exchanger and a contact located at the end of this auxiliary heater that opens and closes by sensing the discharge pressure or temperature, and when the discharge pressure or temperature exceeds a predetermined value. The contact point of the auxiliary heater is placed between the two.

With this configuration, the contacts of the auxiliary heater installed upwind 111M of the indoor heat exchanger are opened and closed depending on the discharge pressure or temperature, so the auxiliary heater is turned off when the discharge pressure or temperature exceeds a predetermined value. , which eliminates the promotion of increase in discharge pressure.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings.

In the figure, 1 is a compressor, 2 is a four-way valve that switches the flow of refrigerant between cooling and heating, and 3 is an outdoor heat exchanger, which acts as a condenser during cooling and as an evaporator during heating.

4 is an expansion valve serving as an expansion mechanism, and 5 is an indoor heat exchanger, which functions as an evaporator during cooling and as a condenser during heating. 6
An auxiliary heater is provided on the windward side of the indoor heat exchanger 5, and one end is connected to the electric rA 7, and the other end is connected to a contact 10 that is opened and closed by a pressure detection detection section 9 provided in the discharge pipe 8. 11 is an operation switch for operating the auxiliary heater 6. Reference numeral 12 denotes an indoor blower, in which air is sucked in through an inlet 13, passes through an auxiliary heater 6, an indoor heat exchanger 5, and is blown out through an outlet 14.

In the above configuration, during heating, the refrigerant is circulated through the compressor 1, the four-way valve 2, the indoor heat exchanger 5 acting as a condenser, the expansion valve 4, and the outdoor heat exchanger 3 acting as an evaporator, and indoor heat exchange is performed. Heating is performed by the heat of condensation in the vessel 5. or,
At the same time, the operation switch 11 of the auxiliary heater 6 is also turned on, and when the discharge pressure is normal, the detection unit 9 detects the contact 1.
0 is closed, the auxiliary heater 6 is energized, and the indoor blower 12 is operated to exchange heat from the auxiliary heater 6 with the indoor heat exchanger 5.
Heating is performed by the condensation heat of If the indoor air temperature rises or the outside air temperature rises during this heating, the temperature passing through the indoor heat exchanger 5 will further increase due to the auxiliary heater 6, so that the discharge pipe 8
pressure increases. When this increased pressure becomes higher than a predetermined pressure, it is detected by the detection unit 9 and the contact 10
is opened, power to the auxiliary heater 6 is cut off, and heating is performed using only the condensed heat of the indoor heat exchanger 5 itself. Therefore, the capacity of the auxiliary heater 6 can be a specific capacity, that is, a capacity greater than the heating capacity of the indoor heat exchanger 5 and the pressure measured.

In this embodiment, the contact 10 is opened and closed based on the discharge pressure, but this may be done by detecting the humidity of the discharge pipe 8.

Effects of the Invention As described above, according to the present invention, in an indoor unit in which an auxiliary heater must be provided on the windward side of the indoor heat exchanger,
Since the discharge pressure or humidity is detected and the auxiliary heater is controlled based on this pressure or temperature, the heat pump type refrigeration cycle can be protected regardless of the capacity of the auxiliary heater. When the temperature rises, bypassing from the discharge pipe side to the suction pipe side is not performed, so that the efficiency of the heat pump does not decrease.

[Brief explanation of the drawing]

The drawing is a configuration diagram showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Compressor, 2... Four-way valve, 3... Outdoor heat exchanger, 4... Expansion valve, 5... Indoor heat exchanger, 6...
Auxiliary heater, 8...Discharge pipe, 9...Detection section, 10
...Contact, 11...Operation switch, 12...Indoor delivery ff1lj! Agent Yoshihiro Morimoto 5-Indoor heat exchange gain 6-M1 cut-der 9--1 detection BP 10-Maturity

Claims (1)

[Claims] 1. A heat pump refrigeration cycle in which a compressor, a four-way valve, an outdoor heat exchanger, an expansion mechanism, an indoor heat exchanger, etc. are installed in sequence, an auxiliary heater installed on the windward side of the indoor heat exchanger, and the auxiliary heater. A heat pump type air conditioner comprising a contact located at an end that opens and closes by sensing discharge pressure or temperature, and configured to open the contact of the auxiliary heater when the discharge pressure or temperature exceeds a predetermined value. Auxiliary heater control device for the machine.