JP2003074944A - Refrigerant heating type cooler/heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerant heating type cooler/heater in which rising rate is enhanced at the time of heating. SOLUTION: If the outer air temperature is low and the refrigeration cycle temperature is low at the time of starting the heating operation, combustion rate of a combustor attached to a refrigerant heater 13 is increased over the maximum rated combustion rate at the time of normal heating operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant heating type cooling and heating apparatus provided with a refrigerant heater in a refrigeration cycle.

[0002]

2. Description of the Related Art A compressor, a four-way valve, an outdoor heat exchanger, a pressure reducer, and an indoor heat exchanger are connected by piping to form a refrigeration cycle, and a compressor is connected between the indoor heat exchanger and the pressure reducer. There is a refrigerant heating type cooling and heating device in which a refrigerant heater is connected by piping to the suction side.

The refrigerant heater is provided with a combustor,
The interior of the room can be heated by heating the refrigerant heater with the combustor.

[0004]

When the outside air temperature is low as in the winter, the refrigerant stagnates during the refrigeration cycle while the operation is stopped, and the temperature of the refrigerant in the compressor becomes considerably low.
Even if the heating operation is started in this state, it takes a long time to warm up the room.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a refrigerant heating type heating device capable of improving the rising speed during heating.

[0006]

In the refrigerant heating type heating apparatus of the invention according to the first aspect, at the start of heating operation, if the outside air temperature is low and the refrigeration cycle temperature is low, the detecting means outputs a detection signal. At this time, the combustion amount of the combustor is made higher than the maximum rated combustion amount during the normal heating operation for a predetermined time.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, an outdoor heat exchanger 3 is connected to a discharge port of a compressor 1 having a variable capacity via a four-way valve 2 by piping. An indoor heat exchanger 8 is connected to the outdoor heat exchanger 3 via a capillary tube 4, which is a pressure reducer, a check valve 5 for forming a cooling cycle, and packed valves 6 and 7. Then, the indoor heat exchanger 8 is pipe-connected to the suction port of the compressor 1 via the packed valves 9 and 10, the four-way valve 2 and the check valve 11.

An on-off valve (two-way valve) extending from the pipe between the check valve 5 and the packed valve 6 to the pipe on the suction side of the compressor 1.
Refrigerant heater 13 is connected via 12 through a pipe.

The refrigerant heater 13 is additionally provided with a combustor consisting of a gas burner 14, a proportional valve 15, and a blower fan 16, and heats the refrigerant by the combustion of the gas burner 14. The heating amount is controlled by adjusting the fuel supply amount (gas amount) to the gas burner 14 with the proportional valve 15. Further, the blower fan 16 supplies combustion air to the gas burner 14.

An outdoor fan 21 and an outside air temperature sensor 22 are provided near the outdoor heat exchanger 3. An indoor fan 23 and an indoor temperature sensor 24 are provided near the indoor heat exchanger 8.

A refrigerant temperature sensor 25 is attached to the inlet side pipe of the refrigerant heater 13. The refrigerant temperature sensor 26 is attached to the outlet side pipe of the refrigerant heater 13. Further, a refrigerant temperature sensor 27 is attached to the discharge side pipe of the compressor 1.

On the other hand, the control unit 30 is connected to an AC power source 32 via a step-down transformer 31. The control unit 30 performs overall control of the refrigerant heating and cooling system.

The control unit 30 includes a four-way valve 2 and an opening / closing valve 1.
2, the combustor, the outdoor fan 21, the outside air temperature sensor 2
2, the indoor fan 23, the indoor temperature sensor 24, the refrigerant temperature sensors 25 and 26, the inverter circuit 33, the operating portion 34, and the combustion amount adjusting switch 35 are connected.

The inverter circuit 33 rectifies the power supply voltage, converts it into a voltage having a frequency according to a command from the control unit 30, and outputs it. This output becomes the driving power of the compressor 1. The combustion amount adjusting switch 35 adjusts the combustor of the refrigerant heater 13 within a predetermined maximum combustion amount and minimum combustion amount range during installation or inspection of the device by an installer or a serviceman. It is operated from time to time, and is generally provided on the outdoor unit side where the refrigerant heater 13 is provided in order to confirm the combustion state of the combustor during operation and to improve the operation workability. The combustion amount adjustment switch 35 has a first adjustment mode and a second adjustment mode as setting contents.

The control unit 30 mainly includes the following functional means.

[1] The four-way valve 2 is set to the cooling mode and the on-off valve 12 is closed, whereby the compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the capillary tube 4, the check valve 5, and the indoor heat exchange are performed. The compressor 1 constitutes a closed cycle in which the compressor 8 is sequentially connected.
Is a control means for cooling operation for controlling the operation (controlling the output frequency F of the inverter circuit 33) in a capacity range from low operation capacity to maximum operation capacity.

[2] Switching the four-way valve 2 to open the on-off valve 12, whereby the compressor 1, the four-way valve 2, the indoor heat exchanger 8,
A closed cycle in which the on-off valve 12 and the refrigerant heater 13 are sequentially connected is configured to perform combustion control of the combustor (combustion control of the gas burner 14) and to set the maximum operating capacity value of the compressor 1 to the maximum operating capacity value for cooling operation. Control means for heating operation, which is set low and controls the operation of the compressor 1 with its capacity range.

[3] Overload protection means for detecting the overload of the compressor 1 and stopping the operation. For example, during the heating operation, when the temperature Teo detected by the refrigerant temperature sensor 26 rises to an abnormal temperature and reaches a set value, the operation of the compressor 1 and the combustion of the combustor are stopped.

[4] When the first adjustment mode is set by the combustion amount adjusting switch 35, the operating capacity of the compressor 1, the four-way valve 2, the on-off valve 12, and the combustor of the refrigerant heater 13 are used for adjusting the combustion amount. A means for setting a predetermined operating state. Specifically, the four-way valve 2 is switched to open the on-off valve 12, the compressor 1 and the combustor are further turned on, and the operating capacity of the compressor 1 is made higher than the maximum operating capacity during normal heating operation.

[5] A means for increasing the detection operation level of the overload protection means above the detection operation level during the normal heating operation when the first adjustment mode is set by the combustion amount adjustment switch 35.

[6] When the second adjustment mode is set by the combustion amount adjustment switch 35, the four-way valve 2 is set in the cooling mode and the on-off valve 12 is set in the heating mode (open), and the compressor 1 and the four-way valve are set. A means for forming a closed cycle in which the valve 2, the outdoor heat exchanger 3, the capillary tube 4, the check valve 5, the opening / closing valve 12, and the refrigerant heater 13 are sequentially connected.

[7] When the temperature of the refrigerant discharged from the compressor 1 (the temperature detected by the refrigerant temperature sensor 27) Td is not more than the set value T ₁ at the start of the heating operation, the combustion amount of the combustor is normally heated for a predetermined time. Heating start-up control means that raises the maximum rated combustion amount during operation.

[8] Indoor fan 23 at the start of heating operation
Means for rotating at high speed for a predetermined time.

Next, the operation of the above configuration will be described with reference to the flowcharts of FIGS. 2 and 3.

When the installation of the apparatus main body is completed, it is necessary to adjust the combustion amount of the combustor of the refrigerant heater 13. In making this adjustment, the operator operates the combustion amount adjustment switch 35 to set the first adjustment mode.

When the first adjustment mode is set, the four-way valve 2
To open the on-off valve 12 to turn on the compressor 1 and the combustor. This forms the same cycle as the heating operation.

Then, as shown in FIG. 4, the operating capacity of the compressor 1 (output frequency F of the inverter circuit 33) is increased to a level higher than the maximum operating capacity (Fmax) during normal heating operation. At the same time, the detection operation level of the overload protection means, that is, the release point, is shifted up to a position higher than the maximum operation capacity during normal heating operation.

In this way, by raising the operating capacity of the compressor 1 to a place higher than the maximum operating capacity during the normal heating operation, the heating rises faster. That is, even if the combustion amount of the combustor is increased to near the maximum, a cycle state commensurate with it is formed in a short time. Moreover, since the release point of the overload protection is shifted up, the overload protection does not operate unnecessarily, and the combustion amount of the combustor can be smoothly and quickly increased to the vicinity of the maximum.

The broken line in FIG. 4 shows changes in the overload protection detection temperature, the combustion amount, and the operating frequency F when the release point is not shifted up.

Therefore, the operator can easily adjust the combustion amount at the maximum and minimum points by operating the combustion amount adjusting switch 35, and the combustion amount can be adjusted within a short time after the operation. Adjustment can be initiated.

By the way, the refrigerant heater 13 is installed on the outside of the room, and as shown in FIG.
There is a case where it is desired to adjust the combustion amount work in a state where the pipe connection on the indoor side beyond 0 is not completed yet.

In this case, the worker uses the combustion amount adjusting switch 3
Operate 5 to set the second adjustment mode.

When the second adjustment mode is set, the four-way valve 2
Is set in the cooling mode, the on-off valve 12 is opened, the compressor 1 and the combustor are turned on, and the cycle shown by the solid line arrow in FIG. 5 is formed.

Others are the same as the above-mentioned first adjustment mode.

That is, it is possible to easily adjust the combustion amount by operating the combustion amount adjusting switch 35 without requiring the connection of the piping on the inside of the room. Moreover, the combustion amount can be adjusted within a short time after the operation. The adjustment work of can be started.

Next, the operation when the installation is completed and the adjustment of the combustion amount is completed and the actual operation is performed will be described.

If the operation is stopped during the winter, the refrigerant will lie down during the refrigeration cycle. At this time, the temperature of the refrigerant in the compressor 1 is much lower than the set value T ₁ .

Therefore, as shown in the flow chart of FIG. 6, at the start of the heating operation, the temperature of the refrigerant discharged from the compressor 1 (the temperature detected by the refrigerant temperature sensor 27) Td is compared with the set value T ₁ (for example, 48 ° C.). To do.

If the discharge refrigerant temperature Td is lower than the set value T ₁ , the combustion amount of the combustor is increased over the maximum rated combustion amount during normal heating operation for a certain period of time, and the operating capacity of the compressor 1 during normal heating operation is increased. It should be higher than the maximum driving capacity of.

The combustion amount of the combustor is proportional to the opening of the proportional valve 15 as shown in FIG. 8, and the opening "63" of the proportional valve 15 corresponds to the maximum rated combustion amount during normal heating operation. To increase the combustion amount of the combustor above the maximum rated combustion amount during normal heating operation means to set the opening of the proportional valve 15 to, for example, "72" which is larger than "63". With the change in the combustion amount, the rotation speed of the blower fan 16 is increased as shown in FIG. 9, and the amount of combustion air supplied to the gas burner 14 is increased.

By doing so, the rise of heating becomes faster, and the room can be quickly warmed even if the discharge refrigerant temperature Td is low. Further, in order to further accelerate the rise of heating, the indoor fan 23 is rotated at high speed to increase the air volume. After a certain period of time,
Perform normal heating operation.

It is considered that the reason why the rising of the heating capacity is delayed is that, in addition to the decrease of the discharge refrigerant temperature Td, the decrease of the outside air temperature To and the temperature Tei of the refrigerant flowing into the refrigerant heater 13. The control using the outside air temperature To and the refrigerant temperature Tei is shown in the flowchart of FIG.

That is, at the start of the heating operation, the outside air temperature To detected by the outside air temperature sensor 22 is compared with the set value T _2, and the refrigerant temperature Tei detected by the refrigerant temperature sensor 25 is further compared.
And the set value T ₃ are compared.

When the outside air temperature To is lower than the set value T ₂ and the refrigerant temperature Tei is lower than the set value T ₃ , the combustion amount of the combustor is increased over the maximum rated combustion amount during the normal heating operation for a certain period of time. The operating capacity of the compressor 1 is set higher than the maximum operating capacity during normal heating operation.

By doing so, the rise of heating is accelerated, and the room can be quickly warmed even if the outside air temperature To and the refrigerant temperature Tei are low. Further, in order to further accelerate the rise of heating, the indoor fan 23 is rotated at high speed to increase the air volume. After a certain period of time, the normal heating operation is performed.

[0047]

As described above, according to the present invention,
A refrigerant heating type heating device capable of improving the rising speed during heating can be provided.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a refrigeration cycle and a control circuit according to an embodiment.

FIG. 2 is a flowchart for explaining the operation of the first adjustment mode of the same embodiment.

FIG. 3 is a flowchart for explaining the operation of the second adjustment mode of the same embodiment.

FIG. 4 is a detection temperature for overload protection, a combustion amount,
The figure which shows the change of operating frequency.

FIG. 5 is a diagram showing a refrigerant flow in a second adjustment mode of the same embodiment.

FIG. 6 is a flowchart for explaining an operation at the time of starting heating according to the same embodiment.

FIG. 7 is a flowchart for explaining a modified example of the operation at the time of starting heating in the same embodiment.

FIG. 8 is a diagram showing a relationship between a proportional valve opening degree and a combustion amount according to the same embodiment.

FIG. 9 is a diagram showing a relationship between a combustion amount and a rotation speed of a blower fan in the same embodiment.

[Explanation of symbols]

1 ... Compressor with variable capacity, 2 ... Four-way valve, 3 ... Outdoor heat exchanger, 4 ... Capillary tube (pressure reducer), 8 ... Indoor heat exchanger, 12 ... Open / close valve, 13 ... Refrigerant heater, 14 ... Gas burner , 15 ... Proportional valve, 16 ... Blower fan, 25, 2
6, 27 ... Refrigerant temperature sensor, 30 ... Control unit, 33 ... Inverter circuit.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takeshi Sato             336 Tatehara, Fuji City, Shizuoka Prefecture Toshiba Corporation             Inside the Fuji factory F-term (reference) 3L060 AA06 CC03 CC04 CC08 DD02                       DD05 EE04 EE05 EE07

Claims (5)

[Claims] 1. A compressor with variable capacity, a four-way valve, an outdoor heat exchanger, a pressure reducer, an indoor heat exchanger, an on-off valve, a refrigeration cycle having a refrigerant heater, a combustor for heating the refrigerant heater, It is equipped with an outdoor fan and an indoor fan, and controls the four-way valve and on-off valve of the refrigeration cycle so that the compressor, four-way valve, outdoor heat exchanger, pressure reducer, and indoor heat exchanger are connected in sequence during cooling operation. A cooling operation control means that configures a cycle to control the operation of the compressor in a capacity range from low operation capacity to maximum operation capacity, a compressor, a four-way valve during heating operation,
Combustion control of the combustor is performed by forming a closed cycle in which an indoor heat exchanger and a refrigerant heater are sequentially connected, and the maximum operating capacity value of the compressor is set lower than the maximum operating capacity value for cooling operation and compression is performed within that capacity range. Heating operation control means for controlling the operation of the machine,
In a refrigerant heating type cooling and heating apparatus equipped with, a detection means for detecting a state in which the outside air temperature is low and the refrigeration cycle temperature is low, and the detection signal of this detection means causes the combustion of the combustor for a predetermined time at the start of heating operation. A heating / cooling control device for heating a refrigerant, the heating start-up control means for increasing the amount of combustion above the maximum rated combustion amount during normal heating operation. 2. The refrigerant heating and cooling apparatus according to claim 1, wherein the heating start-up control means further comprises means for increasing the operating capacity of the compressor above the maximum operating capacity during normal heating operation. Refrigerant heating type air conditioner. 3. The refrigerant heating and cooling apparatus according to claim 1 or 2, wherein the detection means is composed of a refrigerant temperature sensor that detects a refrigerant temperature discharged from the compressor, and when the heating operation is started, If the detected temperature of the refrigerant temperature sensor is equal to or lower than a set value, a detection signal is output, and the refrigerant heating type cooling and heating apparatus is characterized. 4. The refrigerant heating and cooling apparatus according to claim 1 or 2, wherein the detecting means detects an outside air temperature sensor for detecting an outside air temperature and a temperature of the refrigerant flowing into the refrigerant heater. Consists of a refrigerant temperature sensor,
A refrigerant heating type cooling and heating apparatus, which is configured to output a detection signal when the temperature detected by the outside air temperature sensor and the temperature detected by the refrigerant temperature sensor are both set values or less at the start of heating operation. 5. The refrigerant heating and cooling apparatus according to claim 1 or 2, further comprising heating start-up control means for rotating the indoor fan at a high speed for a predetermined time at the start of heating operation. Refrigerant heating type air conditioner.