JPH068462Y2 - Refrigerant heating type heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a refrigerant heating type heater provided with a refrigerant heater in a refrigeration cycle for circulating a refrigerant.

(Prior Art) A refrigeration cycle of a refrigerant heating type heater is generally configured as shown in FIG. That is, 1 is a compressor, the discharge side of which is connected to an outdoor heat exchanger 3 via a four-way valve 2, and the outdoor heat exchanger 3 is connected to an indoor heat exchanger 5 via an electronic expansion valve 4. . Further, the indoor heat exchanger 5 is connected to the suction side of the compressor 1 via the four-way valve 2. Further, one end of a refrigerant heating circuit 6 is connected between the outdoor heat exchanger 3 and the electronic expansion valve 4,
The other end is connected between the four-way valve 2 and the suction side of the compressor 1. A refrigerant heater 7 is provided in the middle of the refrigerant heating circuit 6, and one end of a bypass circuit 8 is connected to the refrigerant heater 7 and the inlet side. The other end of the bypass circuit 8 is connected between the four-way valve 2 and the indoor heat exchanger 5, and an opening / closing valve 9 and a flow restrictor 10 are provided in the middle of the bypass circuit 8. Further, a first temperature sensor 11 is provided on the inlet side of the refrigerant heater 7 and a second temperature sensor 12 is provided on the outlet side thereof, and the temperature detection signals of the both temperature sensors 11, 12 are sent to the controller 14. Entered,
The on-off valve 9 is controlled to open and close.

Therefore, during the heating operation, the high-temperature high-pressure gas refrigerant discharged from the compressor 1 is guided to the indoor heat exchanger 5 via the four-way valve 2 and is radiated and condensed there. The liquefied refrigerant is guided to the refrigerant heater 7 through the electronic expansion valve 4, where it is heated and vaporized and returns to the compressor 1. At this time, when the opening / closing valve 9 is opened, the high-temperature high-pressure gas refrigerant introduced into the indoor heat exchanger 5 via the four-way valve 2 joins at the inlet of the refrigerant heater 7 via the bypass circuit 8. The on-off valve 9 is opened and closed by the temperature difference between the first and second temperature sensors 11 and 12. That is, the opening / closing valve 9 is opened when the temperature difference is small, and the opening / closing valve 9 is closed when the temperature difference is large.

However, if the on-off valve 9 is opened when the refrigerant recovery is insufficient, the circulation amount in the main circuit decreases, the outlet temperature of the refrigerant heater 7 rises sharply, and the temperature difference becomes larger than the set value. Then, the on-off valve 9 automatically closes, and then the temperature difference decreases and the on-off valve 9 opens again. A hunting phenomenon that repeats this occurs.

(Problems to be Solved by the Invention) As described above, conventionally, the on-off valve provided in the bypass circuit is frequently opened and closed, and there is a problem in the durability of the on-off valve.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a refrigerant heating type heating machine capable of performing stable heating operation by reducing the frequency of opening / closing of the on-off valve to eliminate the hunting phenomenon. Especially.

[Constitution of device]

(Means and Actions for Solving Problems) This invention is a refrigerant heating type heater in which high temperature step-down gas refrigerant discharged from a compressor is condensed in an indoor heat exchanger. With a bypass circuit having an on-off valve between the inlet side of the vessel,
Temperature sensors are provided on the inlet side and the outlet side of the refrigerant heater and the discharge side of the compressor, and the opening / closing valve is controlled to be opened / closed by a temperature detection signal from the temperature sensor and the opening / closing number of the opening / closing valve.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Since the basic refrigerating cycle has the same structure as the conventional one shown in FIG. The same number is assigned to each and the description is omitted.

In FIG. 1, 13 is a third temperature sensor, which is provided on the discharge side of the compressor 1 and detects the temperature of the discharged gas refrigerant. A detection signal is input to the control device 14 together with the first and second temperature sensors 11 and 12, and the third temperature sensor 13 opens and closes the on-off valve 9 provided as a bypass valve in the middle of the bypass circuit 8. The control and the opening of the electronic expansion valve 4 are controlled.

Next, the operation of the refrigerant heating type heater configured as described above will be described. First, when the compressor 1 is started with the on-off valve 9 closed, the high-temperature depressurized gas refrigerant discharged from the compressor 1 is guided to the indoor heat exchanger 5 via the four-way valve 2, where it radiates heat and is condensed. It The liquefied refrigerant is guided to the refrigerant heater 7 through the electronic expansion valve 4, where it is heated and vaporized and returns to the compressor 1.

At the start of heating, the refrigerant circulation amount is small, so the outlet temperature of the refrigerant heater 7 rises sharply as shown in FIG. 2, but after a while, the circulation amount stabilizes and the outlet temperature falls. First and second
A control signal is input from the control device 14 to the electronic expansion valve 4 to adjust the temperature difference between the temperature sensors 11 and 12 set to the set value ΔTs, and the opening thereof is adjusted. And the first and second
When the difference between the temperatures detected by the temperature sensors 11 and 12 becomes smaller than the set value ΔTs, the open / close valve 9 opens, and when the temperature detected by the second temperature sensor 12 rises to TEO, the valve closes. When the on-off valve 9 is opened, the high temperature step-down gas refrigerant introduced into the indoor heat exchanger 5 via the four-way valve 2 merges at the inlet of the refrigerant heater 7 via the bypass circuit 8, but the refrigerant gas recovery Is insufficient, when the on-off valve 9 opens, the temperature detected by the second temperature sensor 12 rapidly rises to TEO and the on-off valve 9 closes again. Since this repetition is repeated many times, the number of times the opening / closing valve 9 is opened / closed is counted, and when the operation is repeated 3 times, the opening / closing valve 9 is forcibly closed by the control signal from the control device 14. Therefore, with the on-off valve 9 closed, the heating operation continues and the indoor temperature rises, and the compressor 1
Is increased, the temperature of the discharged gas refrigerant rises and reaches TD ₁ , which is detected by the third temperature sensor 13, and the first and second temperature sensors 11, 12 are detected.
When the temperature difference is smaller than the set value ΔTs, the forced closing of the on-off valve 9 is released and the normal control is resumed.

That is, the inlet temperature of the refrigerant heater 7 is T ₁ , and the outlet temperature thereof is T ₁ .
₂ , the discharge temperature is T ₃ , the set temperature difference is ΔTs, and the upper limit of the discharge temperature is TD ₁ , T ₂ −T ₁ ≦ Ts ... the open / close valve 9 is open T ₂ ≧ TEO. Valve Closing When this operation is repeated three times, the opening / closing valve 9 is forcibly closed and the above restriction is released with T ₃ ≧ TD ₁ and T ₂ −T ₁ ≦ ΔTs.

In addition, in the said one Example, although the refrigerant heating type cooling / heating machine was demonstrated, it may be a heating machine exclusive machine and is not limited to the said refrigeration cycle.

[Effect of device]

As described above, according to the present invention, the temperature sensor for detecting the inlet temperature, the outlet temperature of the refrigerant heater, and the discharge temperature of the compressor is provided, and the number of times of opening / closing of the on-off valve is counted, and these are input to open / close. Since the valve is controlled to open and close, the opening and closing operation of the opening and closing valve is about 2 to 3 times at startup, and it does not open and close in the steady state, so the durability of the opening and closing valve can be improved and stable heating operation without hunting phenomenon is possible. It will be possible.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram showing a refrigerating cycle of a refrigerant heating type air conditioner showing an embodiment of the present invention, FIG. 2 is an explanatory diagram showing heating starting characteristics, and FIG. It is a systematic diagram which shows the refrigeration cycle of a refrigerant heating type air conditioner. 1 ... Compressor, 5 ... Indoor heat exchanger, 7 ... Refrigerant heater, 8 ... Bypass circuit, 9 ... Open / close valve, 11, 1
2, 13 ... Temperature sensor, 14 ... Control device.

Claims (1)

[Scope of utility model registration request] 1. A high temperature discharged from the compressor, wherein the discharge side of the compressor is connected to an inlet side of a refrigerant heater through an indoor heat exchanger, and the outlet side of the refrigerant heater is connected to a suction side of the compressor. In a refrigerant heating type heater configured to radiate high pressure gas refrigerant in an indoor heat exchanger, a bypass circuit having an on-off valve is provided between the discharge side of the compressor and the inlet side of the refrigerant heater, and the refrigerant heating Temperature sensors are provided on the inlet side and the outlet side of the container and the discharge side of the compressor, and a control device for controlling the opening / closing of each of the temperature sensors and the number of opening / closing of the opening / closing valve as an input signal is provided. Refrigerant heating type heater.