JPH0623880Y2 - Heat pump device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to control of an outdoor blower at the start of heating operation in a heat pump device.

[Conventional technology]

A conventional device of this type is shown in FIG. In the figure
(1) is a compressor that sucks in, compresses and discharges the refrigerant gas, (2) is a four-way switching valve that switches the flow path of the refrigerant gas discharged from the compressor (1), and (3) is a condenser during heating. An indoor heat exchanger that exchanges heat between the refrigerant and the indoor air supplied from the compressor (1) that operates and operates as an evaporator during cooling, and (4) depressurizes the high-pressure refrigerant to a low-pressure refrigerant and the refrigerant flow rate. A throttle device for adjusting the, (5) an outdoor heat exchanger that operates as an evaporator during heating and also operates as a condenser during cooling, and exchanges heat between the refrigerant supplied from the compressor (1) and the outdoor air, (6) is an accumulator that separates the liquid refrigerant and the gas refrigerant and sucks only the gas refrigerant into the compressor (1), (7) and (8)
Are blowers for supplying air to the indoor heat exchanger (3) and the outdoor heat exchanger (5), respectively (9) is the indoor heat exchanger (3)
This is an indoor refrigerant temperature detecting device for detecting the temperature of the refrigerant flowing between the cooling device and the expansion device (4). In the figure, the solid line arrow indicates the refrigerant circulation direction during the heating operation for heating by the indoor heat exchanger (3), and the broken line arrow indicates the refrigerant circulation direction during the cooling operation.

Next, the operation will be described. Compressor during heating operation (1)
The high-temperature and high-pressure gas refrigerant discharged from is supplied to the indoor heat exchanger (3) via the four-way switching valve (2) and radiates heat to indoor air for heating and liquefies at the same time. This liquefied refrigerant is
It is decompressed by the expansion device (4) to become a low-temperature low-pressure gas-liquid mixed refrigerant, which then absorbs heat from the outdoor air in the outdoor heat exchanger (5) and is vaporized. In addition, the vaporized gas refrigerant is a four-way switching valve (2).
Flow into the accumulator (6) through the outdoor heat exchanger (5)
The liquid refrigerant that has not been completely vaporized and is separated here is separated, and only the low-pressure gas refrigerant is sucked into the compressor (1).

Further, during the heating operation described above, when the outdoor air temperature is low, moisture in the air adheres to the outdoor heat exchanger (5) in a frosted manner, and when the amount of frost increases, a predetermined heat exchange performance can be obtained. Disappear. Therefore, a so-called defrosting operation is performed in which the four-way switching valve (2) is switched for only a short time to remove frost.

On the other hand, during the cooling operation, as in the defrosting operation described above, the high-temperature and high-pressure gas refrigerant discharged from the compressor (1) is supplied to the outdoor heat exchanger (5) via the four-way switching valve (2). It is liquefied and decompressed by the expansion device (4), then it absorbs heat from the indoor air in the indoor heat exchanger (3) to cool it and vaporize it at the same time.
Return to compressor (1) via (2) and accumulator (6).

The indoor blower (7) is continuously operated during the cooling operation, but during the heating operation, the refrigerant temperature is detected by the indoor refrigerant temperature detection device (9) at a predetermined temperature (for example, 35 ° C.) or more in order to prevent discomfort caused by blowing cold air. Drive at. Also, an outdoor blower
(8) basically operates in conjunction with the compressor (1), but is controlled to stop during defrosting operation in order to perform defrosting efficiently and in a short time.

[Problems to be solved by the invention]

Since the conventional heat pump device is configured as described above, the indoor refrigerant temperature detection device is configured so that the start of operation of the indoor blower (7) is delayed compared to the operation of the compressor (1) during heating operation.
Since it is controlled by (9), when the outdoor air temperature is relatively high, the pressure of the refrigerant discharged from the compressor (1) rises sharply. Therefore, the detection of the indoor refrigerant temperature detection device (9) causes an operation delay that cannot follow the temperature rise due to the pressure rise, and in some cases, a protection device such as a high pressure switch or an overcurrent relay (not shown below). However, there was a problem in that the car would operate and become inoperable. In addition, the probability of occurrence of such a problem increases because the performance of the indoor heat exchanger (3) decreases as the usage period increases.

The present invention has been made to solve the above problems, and it is an object of the present invention to obtain a heat pump device that can prevent the operation of a protection device that may occur at the start of heating operation and can smoothly start heating operation. To aim.

[Means for solving problems]

In the heat pump device according to the present invention, the compressor,
A refrigerant circuit in which a four-way switching valve, an outdoor heat exchanger, an indoor heat exchanger, and a throttle device are sequentially connected by piping, an indoor blower that introduces indoor air into the indoor heat exchanger, and an outdoor air is introduced into the outdoor heat exchanger. In the heat pump device having an outdoor blower that does, and an indoor refrigerant temperature detection device that detects the temperature of the refrigerant that flows between the indoor heat exchanger and the expansion device, an outdoor that detects the temperature of the refrigerant that flows between the outdoor heat exchanger and the expansion device. A refrigerant temperature detection device, and a timer means for detecting that a predetermined time has elapsed from the start of operation of the compressor, at the start of heating operation, the indoor blower when the refrigerant temperature from the indoor heat exchanger reaches a predetermined value or more With the start of
Start the operation of the outdoor blower when the temperature of the refrigerant supplied to the outdoor heat exchanger falls below a predetermined value or when a predetermined time has elapsed from the start of the compressor regardless of the temperature of the refrigerant supplied to the outdoor heat exchanger. It was done like this.

[Action]

The heat pump device according to the present invention operates the outdoor blower when the outdoor refrigerant temperature is equal to or lower than a predetermined temperature at the start of the heating operation or when a predetermined time elapses after starting the compression regardless of the temperature of the refrigerant supplied to the outdoor heat exchanger. Since it is controlled to start, even when heating is performed under conditions of high outdoor air temperature, it is possible to suppress a rapid increase in high pressure at the beginning of operation due to a delay in the operation of the indoor blower to prevent cold air blowout, and to prevent transient Prevent activation of the protective device under certain conditions. In addition, the low heating capacity with the outdoor blower stopped does not result in long-term operation.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. First
FIG. 1 is an overall configuration diagram of a heat pump device according to an embodiment of the present invention. In the figure, the same reference numerals as in FIG.
Since (9) is exactly the same as the conventional heat pump device, its explanation is omitted. In the figure, (10) is an outdoor refrigerant temperature detection device for detecting the temperature of the refrigerant flowing between the expansion device (4) and the outdoor heat exchanger (5).

FIG. 2 is an electric circuit diagram of the heat pump device shown in FIG. In the figure, (11) is an operation switch, (12) is a heating / cooling changeover switch, (21) is a contactor coil that controls the operation / stop of the compressor (1), and (22) is a four-way switching valve (2) electromagnetic coil. , (23) and
(25) is the contactor coil that controls the operation and stop of the indoor blower (7) and the outdoor blower (8), (25a) is the normally open contact of the outdoor blower contactor, and (31) is the excitation during heating operation. Coil of the auxiliary relay, (31a) and (31b) are the normally open and normally closed contacts of the auxiliary relay, respectively (32) is the contactor coil (21)
A timer connected in parallel with, (32a) is its normally open contact,
(9a) and (10a) are the indoor refrigerant temperature detecting device (9) and the contact points of the outdoor refrigerant temperature detecting device, (33) is the contact point of the room thermometer that operates by detecting the indoor temperature, and (34b) is the defrost control It is a contact for use.

Next, the operation of this embodiment will be described. Since the operation on the refrigerant circuit side is the same as that of the conventional heat pump device, detailed description thereof will be omitted, but the operation of each device during heating will be described using the electric circuit diagram shown in FIG.

When the cooling / heating switch (12) is turned on to the heating side, the four-way switching valve coil (22) and auxiliary relay coil (31)
Is excited, the four-way switching valve (2) switches to the heating side,
The refrigerant discharged from the compressor (1) is guided to the indoor heat exchanger (3). The normally open contact (31a) of the auxiliary relay is closed, and the normally closed contact (31b) of the auxiliary relay is open. From the above state, when the operation switch (11) is turned on, the contactor coil (21) is excited when the room thermoelectric contact (33) is closed, so the compressor (1) starts operation. . Further, the contactor coil (23) for the indoor blower is connected in series with the normally open contact (31a) and the contact (9a) of the indoor refrigerant temperature detecting device (9), so immediately after the operation switch (11) is turned on. , The temperature of the indoor refrigerant has not risen sufficiently, so the contact (9a) is open and the coil
The indoor blower (7) is not operated because (23) is demagnetized.
When the operation of the compressor (1) is continued in such a state, the high pressure discharged gradually increases, and the temperature of the refrigerant to which the indoor refrigerant temperature detecting device (9) is attached rises accordingly. Therefore, when the above-mentioned refrigerant temperature reaches a predetermined value (for example, 35 ° C) or more, the contact (9a) is closed, so that the contactor coil (23)
Is excited, the operation of the indoor blower (7) is started, and the function of so-called cold air prevention is achieved.

On the other hand, the contactor coil (25) of the outdoor blower (8) has an operation switch (11), a room thermo contact (33), a defrosting contact (34b), a normally open contact (31a) and each contact (10a) during heating operation. ) (25a) (32
It is connected in series with the parallel circuit of a). The contact (10a) of the outdoor refrigerant temperature detection device (10) is closed at a predetermined temperature (for example, 5 ° C.) or lower. In such a configuration, when the operation switch (11) is turned on, when the outdoor air temperature is relatively low, the contact (10a) is closed immediately after the start of operation, so that the outdoor blower contactor coil (25) is immediately excited. Therefore, the outdoor blower (8) starts operation in a relatively short time. Also, when the outdoor air temperature is high, the contact (10a) is open for a while after the compressor (1) is started, and the outdoor blower (8) is not operating. (10) The temperature of the mounting part gradually decreases, reaching the specified temperature or lower, and the contact (10a)
Closes. Since the contactor coil (25) for the outdoor blower is excited according to the closed circuit of the contact (10a), the contact (25a) is closed and the contactor coil (25) holds itself, so the outdoor blower is closed.
The outdoor blower (8) continues to operate even when the open circuit of the outdoor refrigerant temperature detection device contact (10a) occurs due to the operation of (8). That is, the outdoor blower is operated regardless of the outdoor refrigerant temperature once it is started, thereby preventing deterioration of component reliability due to frequent start and stop of the outdoor blower. Continuing heating without operating the outdoor blower (8) causes a decrease in capacity and a decrease in the coefficient of performance. Therefore, the operation of the timer (32) causes the operation as described above for a predetermined time (for example, 5 to 8 minutes) or less. I have to.

During defrosting, the contact (34b) is opened, so the outdoor blower contactor coil (25) and the four-way switching valve coil (22) are demagnetized, so the outdoor unit blower (8) is stopped and the refrigerant open circuit is on the cooling side. Switch to.

In addition, during cooling operation, the cooling / heating switch (12) is turned on to the cooling side, so the auxiliary relay (31) is demagnetized, so the normally closed contact (31b) is closed and the normally open contact (31a) is It is open circuit. Therefore, when the operation switch (11) is turned on, the indoor blower contactor coil (23) is constantly excited to continuously operate the indoor blower (7). Since the outdoor blower contactor coil (25) is in parallel with the compressor contactor coil (21) via the room thermo-contact (33), the compressor (1) and the outdoor blower (8) are interlocked. To do.

In the above embodiment, the electric circuit is achieved by the relay sequence, but the control algorithm may be configured in the same manner as in the embodiment using a microcomputer.

[Effect of device]

As described above, according to the present invention, when the temperature of the refrigerant supplied to the outdoor heat exchanger falls below a predetermined value at the start of the heating operation by the outdoor refrigerant temperature detection device and the timer means, the outdoor heat exchanger. Regardless of the temperature of the refrigerant supplied to the compressor, when the specified time has elapsed from the start of the compressor, the operation of the outdoor blower is always started and the control of the outdoor blower is continued once it is started. When the compressor is started under relatively high conditions, the outdoor blower does not start immediately after the compressor starts. Therefore, it is possible to suppress a rapid increase in the high pressure due to the decrease in the low pressure, so even if you delay the start of operation of the indoor blower and prevent the cold air from blowing out, you can prevent the transient activation of the protective device immediately after startup. can do.

Further, since the outdoor blower is controlled to continue to operate after the outdoor blower is activated, the reliability of parts does not deteriorate due to frequent start and stop of the outdoor blower.

Further, since the heating operation time in the state where the outdoor blower is stopped is limited by the timer means, the heating operation is not performed for a long time with the low heating capacity.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a heat pump device according to an embodiment of the present invention, FIG. 2 is an electric circuit diagram of essential parts of a heat pump device according to an embodiment of the present invention, and FIG. 3 is an overall configuration diagram of a conventional heat pump device. Is. In the figure, (1) is a compressor, (2) is a four-way switching valve, (3) is an indoor exchanger, (4) is a throttle device, (5) is an outdoor heat exchanger, (8) is an outdoor blower, and ( Reference numeral 10) is an outdoor refrigerant temperature detecting device, (10a) is a contact of the outdoor refrigerant temperature device (10), (32) is a timer means, (32a) is a timer contact, and (25) is an outdoor fan contactor coil. The same reference numerals in the drawings indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Mitsunori Kurachi, 6-5-66, Tehira, Wakayama, Wakayama Sanryo Electric Co., Ltd. Wakayama Plant (72) Shuichi Tani, 6-tepe, Wakayama, Wakayama 5-66 Sanrishi Electric Co., Ltd. Wakayama Works (72) Inventor Hiroki Masui 6-5-6 Tehira, Wakayama City, Wakayama Prefecture Sanryo Electric Co., Ltd. Wakayama Works (72) Inventor Yoshinobu Igarashi Wakayama Wakayama Prefecture 6-5-6 Ichidaira Sanryo Electric Co., Ltd. Wakayama Plant (56) References: 59-23074 (JP, U) Actual: 53-145751 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A refrigerant circuit in which a compressor, a four-way switching valve, an outdoor heat exchanger, an indoor heat exchanger and a throttle device are sequentially connected by piping, an indoor blower for introducing indoor air into the indoor heat exchanger, and the outdoor. An outdoor blower that introduces outdoor air into a heat exchanger, and a heat pump device having an indoor refrigerant temperature detection device that detects the temperature of the refrigerant flowing between the indoor heat exchanger and the expansion device, between the outdoor heat exchanger and the expansion device. An outdoor refrigerant temperature detection device for detecting the temperature of the refrigerant flowing through the device, and a timer means for detecting that a predetermined time has elapsed from the start of operation of the compressor, and at the start of heating operation, the refrigerant temperature from the indoor heat exchanger is predetermined. When the value exceeds the value, the operation of the indoor blower is started, and when the temperature of the refrigerant supplied to the outdoor heat exchanger drops below a predetermined value, or the temperature of the refrigerant supplied to the outdoor heat exchanger is reached. When a predetermined time has elapsed after the compressor starts unchanged, always after once started and starts the operation of the outdoor fan is heat pump device being characterized in that so as to continue the operation of the outdoor blower.