JP2011257098A - Heat pump cycle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pump cycle device of high efficiency of heating operation by minimizing frequency of a defrosting operation in the heating operation.SOLUTION: As an allowable maximum rotational frequency of a compressor 1 is controlled to be changed according to detected condensation pressure, or detected water temperature and outside air temperature, the operation of the compressor 1 can be properly controlled according to an operating state of the heat pump cycle device 100, and the operation of the heat pump cycle device 100 can be efficiently controlled. In particular, under the outside air temperature at which the defrosting operation of an outdoor heat exchanger 5 is needed in the heating operation, as the allowable maximum rotational frequency of the compressor 1 is determined to suppress frost formation in the outdoor heat exchanger 5, and the compressor 1 is operated within the allowable maximum rotational frequency, the frequency of the defrosting operation is reduced, or a time of the defrosting operation is shortened, and further as the heating operation is performed for a long time in a state that the rotational frequency of the compressor 1 is increased as much as possible, the operation of the heat pump cycle device 100 can be more efficiently controlled.

Description

  The present invention relates to a heat pump cycle device such as a heat pump type hot / cold water / air conditioner, and more particularly to a heat pump cycle device that performs a more efficient heating operation by reducing the frequency of defrosting operation during heating operation as much as possible. .

  Conventionally, as a heat pump cycle device, there are a heat pump hot water supply device and a heat pump hot / cold water air conditioner. In such a heat pump cycle device, for example, when the outside air temperature is low and high, the operating capacity of the heat pump cycle device at the same compressor speed changes, so the outside air temperature is always detected and the outside air temperature changes. The ability of the compressor was changed by changing the rotation speed of the compressor.

  As such a heat pump cycle device, there has been proposed a heat pump cycle device that detects the outside air temperature at regular intervals and controls the rotation speed of the compressor and the opening of the expansion valve according to the detected change in the outside air temperature. (For example, refer to Patent Document 1).

  Patent Document 1 discloses a refrigeration cycle apparatus having a refrigerant circuit to which a compressor, a use side heat exchanger, an electric expansion valve, and an outdoor heat exchanger that is a heat source side heat exchanger are connected, and the refrigeration cycle. A hot water storage tank that stores hot water supplied by the device and the outside air temperature are detected at regular intervals, and the compression function force (number of rotations) and the opening of the electric expansion valve are detected according to a predetermined standard with respect to the detected change in the outside air temperature. A heat pump type hot water supply device provided with a control device for controlling the degree is described.

In this heat pump type hot water supply device, the control device detects the outside air temperature every predetermined time, for example, every 30 minutes, and detects the change in the outside air temperature. Then, the control device, in accordance with the detected change in the outside air temperature, a predetermined reference, for example, a table in which the outside air temperature measured in advance in a test or the like and stored in the control device is associated with the rotation speed of the compressor, etc. Accordingly, the operation of the heat pump type hot water supply apparatus can be efficiently controlled by controlling the compression function force and the opening degree of the electric expansion valve.
However, the heat pump cycle apparatus as described above has the following problems.

  During the heating operation of the heat pump cycle device, when the outside air temperature is low (about 5 ° C. to −10 ° C.), the outdoor heat exchanger (evaporator) may be frosted. Become. In general, the lower the outside air temperature, the lower the saturated water vapor pressure in the air, so the amount of frost formation in the outdoor heat exchanger decreases. In addition, when the outdoor air temperature is equal to or higher than a certain temperature (for example, 5 ° C.), the temperature of the outdoor heat exchanger is less than 0 ° C., so the amount of frost formation in the outdoor heat exchanger is reduced. Furthermore, since the amount of refrigerant flowing into the outdoor heat exchanger decreases as the compressor speed decreases, the amount of frost formation in the outdoor heat exchanger also decreases in this case.

In the conventional heat pump cycle device, control is generally performed to increase the rotational speed of the compressor with a decrease in the outside air temperature, but when the rotational speed of the compressor is simply increased by following the decrease in the outside air temperature, For example, compression is performed at a high compressor rotation speed when the temperature is low but the saturation water vapor pressure is relatively high, that is, the outside air temperature (about 5 ° C. to −10 ° C.) is likely to cause frost formation in the outdoor heat exchanger. When the machine is operated, the amount of frost formation on the outdoor heat exchanger increases. When the amount of frost on the outdoor heat exchanger increases, the defrosting operation must be performed frequently. As a result, the heating operation and the defrosting operation are frequently switched, resulting in an inefficient heating operation. It was.

Japanese Unexamined Patent Publication No. 2003-74970 (pages 3 to 5, FIGS. 2 and 3)

  An object of the present invention is to solve the above-described problems and to provide a heat pump cycle device with high heating operation efficiency by reducing the frequency of defrosting operation during heating operation as much as possible.

  The present invention solves the above-mentioned problem, and the heat pump cycle device of the present invention includes a refrigerant circuit having a compressor, a use side heat exchanger, an expansion valve, and a heat source side heat exchanger, and a condensation pressure detecting means. And / or a water temperature detection means, an outside air temperature detection means, and a control means, the control means corresponding to a plurality of condensing pressures or a plurality of water temperatures and an outside air temperature in the refrigerant circuit. A compressor rotation speed table storing the allowable maximum rotation speed. The control means detects the condensing pressure by the condensing pressure detecting means, or detects the water temperature by the water temperature detecting means, and detects the outside air temperature by the outside air temperature detecting means, and detects it by referring to the compressor rotation speed table. The rotational speed of the compressor is controlled within the allowable maximum rotational speed corresponding to the condensation pressure or the water temperature and the outside air temperature.

  The compressor rotation speed table has an outside air temperature range in which the outside air temperature is divided by a predetermined value, and the allowable maximum number of rotations of the compressor is set according to the outside air temperature range. Furthermore, the compressor rotation speed table includes a first outside air temperature range that requires the defrosting operation of the outdoor heat exchanger and a second outside air temperature range that does not require the defrosting operation of the outdoor heat exchanger. And the allowable maximum rotational speed of the compressor in the first outside air temperature range is set to a value lower than the allowable maximum rotational speed of the compressor in the second outside air temperature range.

  The heat pump cycle device of the present invention controls the operation of the compressor by changing the allowable maximum number of rotations of the compressor according to the detected condensing pressure or water temperature and the outside air temperature. Therefore, by appropriately controlling the operation of the compressor according to the operation state of the heat pump cycle device, the amount of frost formation in the heat source side heat exchanger can be suppressed, and the operation control of the heat pump cycle device can be performed efficiently. .

  In particular, at the outdoor temperature where the defrosting operation of the outdoor heat exchanger is necessary during heating operation, the maximum allowable rotation speed of the compressor is set to suppress the amount of frost formation in the outdoor heat exchanger, and within this allowable maximum rotation speed Since the compressor is operated, the frequency of performing the defrosting operation is reduced, and the heating operation can be performed with the rotation speed of the compressor being increased as much as possible. Therefore, the operation of the heat pump cycle device can be controlled more efficiently while appropriately performing the defrosting operation.

It is a block diagram of the heat pump cycle apparatus in the Example of this invention. It is a compressor rotation speed table in the Example of this invention. It is a flowchart explaining the control by the Example of this invention. It is a compressor rotation speed table in the other Example of this invention.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. As an example, a heat pump cycle device having an indoor unit such as a floor heating device or an indoor unit and performing heat exchange between water and refrigerant in a use side heat exchanger will be described as an example. The present invention is not limited to the following embodiments, and can be variously modified without departing from the gist of the present invention.

  FIG. 1 shows a configuration of a heat pump cycle apparatus according to the present invention. The heat pump cycle device 100 includes a compressor 1, a four-way valve 2, a use side heat exchanger 3 that performs heat exchange between refrigerant and water, a first expansion valve 4, an outdoor heat exchanger 5 that is a heat source side heat exchanger, The accumulator 6 is connected by the refrigerant | coolant piping 12 in order, and the refrigerant circuit is comprised, and it is comprised so that the refrigerant | coolant circulation direction may be switched via the four-way valve 2. FIG. Further, between the use side heat exchanger 3 of the refrigerant pipe 12 and the first expansion valve 4 and a refrigerant inlet (not shown) of the compressor 1, an injection having a second expansion valve 15 and an electromagnetic opening / closing valve 16. They are connected by a pipe 14.

  The use side heat exchanger 3 includes a heat exchange temperature sensor 20 that detects the temperature of the refrigerant flowing through the refrigerant pipe 12, and an outdoor air temperature sensor 21 that is an outside air temperature detection means in the vicinity of the outdoor heat exchanger 5. A discharge temperature sensor 22 for detecting the discharge temperature of the refrigerant is located near the discharge port 1, and a refrigerant for detecting the temperature of the refrigerant in the vicinity of the first expansion valve between the use-side heat exchanger 3 and the first expansion valve 4. Temperature sensors 23 are respectively arranged. Furthermore, a pressure sensor 30 serving as a condensation pressure detecting unit is installed on the refrigerant 1 discharge side of the refrigerant pipe 12 (between the four-way valve 2 and the use-side heat exchanger 3).

  A refrigerant pipe 12 and a water pipe 13 are connected to the use-side heat exchanger 3, and a circulation pump 17 for circulating water is connected to the water pipe 13 so that the refrigerant and Heat exchanged water is circulated. Further, a water temperature sensor 24 that is a water temperature detecting means is installed in the vicinity of the water outlet of the use side heat exchanger 3.

  The heat pump cycle apparatus 100 takes in the temperature detected by each temperature sensor and the condensing pressure detected by the pressure sensor 30, or the compressor 1 and the four-way valve in response to an operation request from a user using a remote controller (not shown). 2, a circulation pump 17, an electromagnetic on-off valve 16, a first expansion valve 4, and a second expansion valve 15 are controlled to control the heat pump cycle device 100. The control means 10 controls the output frequency of the inverter (not shown) to control the rotational speed of the compressor 1, and the rotational speed of the compressor 1 is periodically stored as management data in a storage unit of the control means 10 (not shown). Yes.

  In FIG. 1, the refrigerant flow direction during heating operation is indicated by an arrow 60, and the refrigerant flow direction when the second expansion valve 15 and the electromagnetic on-off valve 16 are opened and the refrigerant flows into the injection pipe 14 is indicated by an arrow 61. The flow directions of the hot water in the piping 13 are indicated by arrows 62, respectively. Further, the refrigerant flow direction during the cooling operation or the defrosting operation is opposite to the refrigerant flow direction during the heating operation, but the description of the refrigerant flow direction by arrows is omitted.

  The operation of the heat pump cycle apparatus 100 having the above-described configuration will be described by taking a case where the heating operation is performed as an example. When the user operates the remote control or the like of the indoor unit 11 to turn on the switch, the heat pump cycle device 100 starts operation, and the control means 10 rotates the circulation pump 17 to connect the use side heat exchanger 3 and the indoor unit 11. Circulate water between them.

  At the same time, the control means 10 corresponds to the set temperature, which is the current temperature detected by the water temperature sensor 24, that is, the temperature of the water heated by the use-side heat exchanger 3, which is the target temperature of the heating operation determined by the user. The compressor 1 is rotated so that the temperature of the water to be reached is reached. The refrigerant that has become a high-temperature and high-pressure gas in the compressor 1 passes through the four-way valve 2, releases heat in the use side heat exchanger 3, becomes a liquid, and is further depressurized in the first expansion valve 4, and the outdoor heat exchanger 5. The process of evaporating and exchanging heat with outdoor air is repeated as a gas and compressed by the compressor 1 again. The four-way valve 2 is used to reverse the direction of refrigerant circulation during cooling and defrosting operations.

  Further, when a high water temperature is required in a state where the outside air temperature is low during the heating operation, the control means 10 opens the electromagnetic on-off valve 16 and responds to the condensation pressure detected by the pressure sensor 30 and the rotation speed of the compressor 1. Then, the second expansion valve is opened at a predetermined opening, and the injection is turned on. When the injection is turned on, liquid refrigerant is injected into the mechanical portion of the compressor 1 to lower the discharge temperature of the compressor 1 and increase the amount of refrigerant circulating in the use-side heat exchanger 3, so that the outside air temperature is high at a low temperature. Even when the water temperature is required, high heating capacity can be exhibited by increasing the refrigerant flow rate in the use side heat exchanger 3. During the cooling operation or the defrosting operation, the electromagnetic on-off valve 16 is kept closed, that is, the injection is OFF.

  Next, the principle and control for determining the allowable maximum number of rotations of the compressor 1 during the heating operation in the present embodiment will be described with reference to FIGS. 1 to 3. Note that the compressor 1 of the present embodiment will be described assuming that the performance limit rotational speed is 90 rps. A compressor speed table A shown in FIG. 2 is stored in the storage unit of the control means 10. The compressor rotation speed table A defines the allowable maximum rotation speed (unit: rps) of the compressor 1 at the condensation pressure and the outside air temperature during heating operation, and the item in the left column is the outside air temperature (unit: ° C.). ). Here, the outside air temperature is divided every 5 ° C. to form the outside air temperature range. As for the outside air temperature range, a range from −10 ° C. to less than 5 ° C., which is the outside air temperature that requires defrosting operation during heating operation, is divided every 5 ° C. Other than that, that is, when the outside air temperature is 5 ° C. or more and when it is less than −10 ° C., the second outside air temperature range is set.

  The allowable maximum number of rotations of the compressor 1 corresponds to the outside air temperature range in each case of “condensation pressure: less than 3.0 MPa (megapascal, hereinafter referred to as MPa)” and “condensation pressure: 3.0 MPa or more”. When the condensation pressure is less than 3.0 MPa, the allowable maximum number of rotations of the compressor 1 in the first outside air temperature range is 75 rps when the outside air temperature is 0 ° C. or more and less than 5 ° C., and the outside air temperature. Is 80 rps when the temperature is −5 ° C. or more and less than 0 ° C., and 85 rps when the outside air temperature is −10 ° C. or more and less than −5 ° C. Further, the allowable maximum rotational speed of the compressor 1 in the second outdoor air temperature range is 90 rps, which is the performance limit rotational speed of the compressor 1, when the outdoor air temperature is 5 ° C. or higher or lower than −10 ° C. When the condensing pressure is 3.0 MPa or more, the maximum allowable rotational speed of the compressor 1 is 90 rps, which is the performance limit rotational speed of the compressor 1, regardless of the outside air temperature.

  When the outdoor temperature is as high as 5 ° C. or higher, the temperature of the outdoor heat exchanger 5 is also less than 0 ° C., and frost formation is unlikely to occur in the outdoor heat exchanger 5. Further, when the outside air temperature is as low as less than −10 ° C., the saturated water vapor pressure is low, so that frost formation is unlikely to occur in the outdoor heat exchanger 5. Therefore, in the case of the second outside air temperature range where the outside air temperature is 5 ° C. or higher or less than −10 ° C., the frequency of performing the defrosting operation is low. On the other hand, since the amount of refrigerant flowing into the outdoor heat exchanger 5 decreases as the rotational speed of the compressor 1 decreases, the temperature of the outdoor heat exchanger 5 decreases less than 0 ° C., and the outdoor heat exchanger 5 The amount of frost formation is reduced.

  In consideration of the above, in the compressor rotation speed table A of FIG. 2, when the condensation pressure is less than 3.0 MPa, for example, the target water temperature is low, that is, the set temperature during heating operation is relatively low, When the pressure is low, the allowable maximum rotational speed of the compressor 1 in the first outside air temperature range is less than 90 rps, which is the performance limit rotational speed of the compressor 1. This is because the maximum rotation speed of the compressor 1 is lowered and the amount of frost formation in the outdoor heat exchanger 5 is reduced so as not to be frequently switched to the defrosting operation, so that the heating operation time can be extended sufficiently. This is so that a sufficient heating capacity can be obtained.

  In the compressor rotation speed table A of FIG. 2, the allowable maximum rotation speed of the compressor 1 in the first outside air temperature range when the condensation pressure is less than 3.0 MPa is the performance limit rotation speed of the compressor 1. In the range below 90 rps, the value is increased as the outside air temperature range becomes lower. This is because the amount of frost formation in the outdoor heat exchanger 5 decreases as the outside air temperature decreases, so defrosting operation is frequently required even if the allowable maximum number of rotations of the compressor 1 is increased as the outside air temperature decreases. This is because it is considered that the amount of frost formation becomes difficult.

Further, in the compressor rotation speed table A of FIG. 2, when the condensation pressure is 3.0 MPa or more, the target water temperature is high, that is, when the set temperature during heating operation is relatively high and the condensation pressure is high, etc. Regardless of the outside air temperature, the rotational speed of the compressor 1 is allowed to rise to the performance limit of 90 rps so that the target set temperature (water temperature) is reached as quickly as possible.
The allowable maximum rotational speed defined in the compressor rotational speed table A is obtained in advance by a test or the like.

  The operation of the heat pump cycle apparatus 100 storing the compressor rotation speed table A described above is as follows. When the user starts the heating operation of the heat pump cycle apparatus 100 by operating a remote controller or the like or by starting the timer operation, the control means 10 has a current condensing pressure detected by the pressure sensor 30 of less than 3.0 MPa. Determine whether or not. When the condensation pressure is 3.0 MPa or more, the control means 10 extracts 90 rps, which is the performance limit speed of the compressor 1, with reference to the compressor speed table A of FIG. And decide. And the control means 10 controls the rotation speed of the compressor 1 within the allowable maximum rotation speed in accordance with the operation load of the indoor unit 11 and the like.

  When the condensing pressure is less than 3.0 MPa, the control means 10 recognizes the current outside air temperature detected by the outside air temperature sensor 21, and refers to the compressor rotation speed table A in FIG. The allowable maximum number of rotations of the compressor 1 is determined accordingly. And the control means 10 controls the rotation speed of the compressor 1 within the allowable maximum rotation speed in accordance with the operation load of the indoor unit 11 and the like.

  Next, the flow of processing in the control means 10 will be described using a control flowchart of the heat pump cycle apparatus 100 shown in FIG. FIG. 3A shows a main routine of the heat pump cycle apparatus 100. FIG. 3B is a routine for determining the maximum allowable number of rotations of the compressor 1 during the heating operation according to the present invention. This allowable maximum rotational speed determination routine operates in parallel with the main routine, and determines the maximum rotational speed allowed by the compressor 1 during heating operation. In the main routine, the rotational speed of the compressor 1 is controlled in accordance with the operating load of the indoor unit 11 within the maximum rotational speed during the heating operation.

  In the flowchart of FIG. 3, ST represents a step, and the number following this represents a step number. In FIG. 3, the processing according to the present invention is mainly described, and descriptions of general processing such as user setting operation processing and detailed water temperature control are omitted.

  As shown in FIG. 3 (A), when the heat pump cycle device 100 starts operation, the control means 10 starts the rotation of the circulation pump 17 and supplies water between the use side heat exchanger 3 and the indoor unit 11. Circulate (ST1). And the control means 10 takes in the temperature of the circulating water which the water temperature sensor 24 detected (ST2).

  Next, the control means 10 determines whether or not the operation mode of the heat pump cycle device 100 is set to the heating operation (ST3). When the operation mode is not the heating operation, that is, when the operation is the cooling operation or the defrosting operation (ST3-No), the control unit 10 controls the compressor 1 so that the detected value of the water temperature sensor 24 becomes the target water temperature. The number of rotations is determined to control the operation of the compressor 1 (ST5). Then, the process is returned to ST2.

  When the operation mode is the heating operation (ST3-Yes), the control means 10 determines that the detected value of the water temperature sensor 24 is within the allowable maximum rotational speed determined by the allowable maximum rotational speed determination routine of the compressor 1 to be described later. The number of rotations of the compressor 1 is determined so that the water temperature becomes the following, and operation of the compressor 1 is controlled (ST4). Then, the process is returned to ST2.

  Next, the allowable maximum rotational speed determination routine shown in FIG. When the operation mode of the heat pump cycle device 100 is set to the heating operation, the control means 10 extracts the current condensation pressure (ST11). Specifically, the control means 10 periodically takes in the condensation pressure detected by the pressure sensor 30 and stores it as management data in a storage unit of the control means 10 (not shown). Is extracted and recognized as the current condensation pressure.

  In addition to the condensing pressure, the control means 10 includes an outside air temperature detected by an outside air temperature sensor 21 described later, a rotation speed of the compressor 1, a water temperature detected by the water temperature sensor 24, a discharge temperature detected by the discharge temperature sensor 22, and the like. Various parameter values necessary for controlling the refrigeration cycle of the heat pump cycle apparatus 100 are captured and stored in the storage unit as management data.

  Next, the control means 10 determines whether or not the extracted condensation pressure is less than 3.0 MPa (ST12). When the condensation pressure is less than 3.0 MPa (ST12-Yes), the control means 10 extracts the current outside air temperature (ST13). Specifically, the control means 10 periodically takes in the outside air temperature detected by the outside air temperature sensor 21 and stores it as management data in a storage unit (not shown), and extracts the latest outside air temperature from this management data, It is recognized as the current outside air temperature.

Next, the control means 10 refers to the compressor rotation speed table A stored in the storage unit and determines the allowable maximum rotation speed of the compressor 1 (ST14). Specifically, the current condensation pressure extracted in ST11 (in this case, less than 3.0 MPa) and the allowable maximum number of rotations of the compressor 1 corresponding to the current outside air temperature extracted in ST13 are shown in FIG. Extraction is made with reference to the machine speed table A, and this is determined as the allowable maximum speed.
The control means 10 which finished the process of ST14 returns a process to ST11.

  In ST12, when the condensing pressure is 3.0 MPa or more (ST12-No), the control means 10 refers to the compressor rotational speed table A shown in FIG. 90 rps is extracted, and this is determined as the allowable maximum rotational speed (ST15). Then, the process returns to ST11.

  As described above, the allowable maximum number of rotations of the compressor 1 is changed according to the condensation pressure, and further, the allowable maximum number of rotations of the compressor 1 is also changed according to the outside air temperature. Therefore, the outdoor heat exchanger 5 When the heating operation is performed at an outside temperature (4 ° C. to −10 ° C. in this embodiment) where frost formation is likely to occur, the outdoor heat exchanger 5 reduces the amount of frost formation and the compressor 1 as much as possible. Heating operation can be performed by increasing the number of revolutions. As a result, the defrosting operation can be performed appropriately, and the defrosting operation interval time becomes longer, so that the heat pump cycle device 100 can be efficiently controlled so that the heating operation capacity does not decrease.

  In the embodiment described above, in the compressor rotation speed table A in FIG. 2, the allowable maximum rotation speed of the compressor 1 is defined in two cases where the condensation pressure is less than 3.0 MPa / more. However, the condensation pressure is less than 3.0 MPa / 3.0 MPa or more and less than 6.0 MPa / 6.0 Mpa or more (6.0 MPa is, for example, the performance limit discharge pressure of the compressor 1. The allowable maximum number of rotations of the compressor 1 may be defined in three cases: the condensation pressure corresponding to

  Further, in the compressor rotation speed table A of FIG. 2, the outside temperature range is set every 5 ° C. However, for example, even if the range width is changed such that the outside temperature range is set every 4 ° C. Good. In the compressor rotation speed table A of FIG. 2, the allowable maximum rotation speed of the compressor 1 is varied for each outside air temperature range. For example, the compressor when the outside air temperature range is 0 ° C. or more and less than 5 ° C. The allowable maximum number of revolutions of 1 and the allowable maximum number of revolutions of the compressor 1 when the outside temperature range is −5 ° C. or more and less than 0 ° C. are set to the same 75 rps. An allowable maximum rotational speed of 1 may be set.

  Furthermore, in the compressor rotation speed table A of FIG. 2, the outside air temperature range is set for a temperature range in which the outside air temperature is higher than −10 ° C. For example, the outside air temperature is set to a temperature range higher than −15 ° C. When the range is −15 ° C. or more and less than −10 ° C., when the condensation pressure is less than 3.0 MPa, the allowable maximum number of rotations of the compressor 1 is 85 rps, and when the outside temperature is less than −15 ° C., the condensation pressure is 3. When the temperature is less than 0 MPa, the allowable maximum number of rotations of the compressor 1 is 90 rps (the condensing pressure is 90 rps when the condensing pressure is 3.0 MPa or more). It is good also as the heating operation time table which increased the range.

  Next, a second embodiment of the heat pump cycle apparatus according to the present invention will be described. In this embodiment, the configuration of the heat pump cycle device, the refrigerant circuit, the flow of control of the allowable maximum rotational speed of the compressor, and the effect of controlling the allowable maximum rotational speed of the compressor are the same as in the first embodiment. Since there is, explanation is omitted. The difference from the first embodiment is that the water temperature is used instead of the condensing pressure, and the allowable maximum rotation speed of the compressor is changed according to the water temperature.

  In the heat pump cycle apparatus 100 shown in FIG. 1, when the pressure sensor 30 is not provided, the condensation pressure cannot be detected. Therefore, the water temperature detected by the water temperature sensor 24 is used instead of the condensation pressure, and the compressor shown in FIG. The rotational speed table B is stored in the storage unit of the control means 10 to control the maximum allowable rotational speed of the compressor 1. The compressor rotation speed table B defines the allowable maximum rotation speed (unit: rps) of the compressor 1 at the water temperature and the outside air temperature during heating operation, and the item in the left column is the outside air temperature (unit: ° C.). It has become. Here, the outside air temperature at which the outdoor heat exchanger 5 is likely to be frosted during the heating operation, that is, the range of −10 ° C. to less than 5 ° C., which is the outside air temperature that requires the defrosting operation, is divided every 5 ° C. The outside air temperature range. As for the outside air temperature range, a range from −10 ° C. to less than 5 ° C., which is the outside air temperature that requires defrosting operation during heating operation, is divided every 5 ° C. Other than that, that is, when the outside air temperature is 5 ° C. or more and when it is less than −10 ° C., the second outside air temperature range is set.

The maximum allowable number of rotations of the compressor 1 is specified for each of the cases of “water temperature: less than 40 ° C.” and “water temperature: 40 ° C. or more” when the water temperature is less than 40 ° C. The allowable maximum number of rotations of the compressor 1 in the first outside air temperature range is 75 rps when the outside air temperature is 0 ° C. or more and less than 5 ° C., 80 rps when the outside air temperature is −5 ° C. or more and less than 0 ° C., and the outside air temperature When the temperature is -10 ° C or higher and lower than -5 ° C, it is 85 rps. Further, the allowable maximum rotational speed of the compressor 1 in the second outdoor air temperature range is 90 rps, which is the performance limit rotational speed of the compressor 1, when the outdoor air temperature is 5 ° C. or higher or lower than −10 ° C. When the water temperature is 40 ° C. or higher, the allowable maximum rotational speed of the compressor 1 is 90 rps, which is the performance limit rotational speed of the compressor 1, regardless of the outside air temperature.
The allowable maximum rotational speed defined in the compressor rotational speed table B is obtained in advance by a test or the like.

  The operation of the heat pump cycle apparatus 100 storing the compressor rotation speed table B described above is as follows. When the user starts the heating operation of the heat pump cycle device 100 by operating a remote controller or the like or by starting the timer operation, the control means 10 takes in the current water temperature detected by the water temperature sensor 24, and the water temperature is less than 40 ° C. It is determined whether or not. When the water temperature is 40 ° C. or higher, the control means 10 refers to the compressor rotation speed table B in FIG. To do. And the control means 10 controls the rotation speed of the compressor 1 within the allowable maximum rotation speed in accordance with the operation load of the indoor unit 11 and the like.

  When the water temperature is lower than 40 ° C., the control means 10 takes in the current outside air temperature detected by the outside air temperature sensor 21 and refers to the compressor rotation speed table B in FIG. Determine the maximum number of revolutions allowed. And the control means 10 controls the rotation speed of the compressor 1 within the allowable maximum rotation speed in accordance with the operation load of the indoor unit 11 and the like.

  As described above, the allowable maximum number of rotations of the compressor 1 is changed according to the water temperature, and further, the allowable maximum number of rotations of the compressor 1 is also changed according to the outside air temperature. When heating operation is performed at an outside temperature (4 ° C. to −10 ° C. in the present embodiment) where frost formation is likely to occur, the amount of frost formation in the outdoor heat exchanger 5 is reduced, and as much as possible of the compressor 1 Heating operation can be performed by increasing the rotation speed. Thereby, even in a heat pump cycle device that does not have the condensation pressure detection means (pressure sensor 30 in FIG. 1), the defrosting operation can be performed appropriately, and the defrosting operation interval time becomes longer, so that the heating operation capability The heat pump cycle apparatus 100 can be efficiently controlled so that the temperature does not decrease.

  In the embodiment described above, the case where the allowable maximum number of revolutions of the compressor 1 is defined in the compressor revolution number table B of FIG. 4 is divided into two cases where the water temperature is less than 40 ° C./more. However, this is three or more, for example, a water temperature of less than 40 ° C./40° C. or more and less than 60 ° C./60° C. or more (60 ° C. is, for example, a water temperature corresponding to the performance limit discharge pressure of the compressor 1). You may prescribe | regulate the permissible maximum rotation speed of the compressor 1 separately in the case of a street.

  Moreover, in the compressor rotation speed table B of FIG. 4, the outside air temperature range is set every 5 ° C. However, even if the range width is changed, for example, the outside air temperature range is set every 4 ° C. Good. In the compressor rotation speed table B of FIG. 4, the allowable maximum rotation speed of the compressor 1 is varied for each outside air temperature range. For example, the compressor when the outside air temperature range is 0 ° C. or more and less than 5 ° C. The allowable maximum number of revolutions of 1 and the allowable maximum number of revolutions of the compressor 1 when the outside temperature range is −5 ° C. or more and less than 0 ° C. are set to the same 75 rps. An allowable maximum rotational speed of 1 may be set.

  Furthermore, in the compressor rotation speed table B of FIG. 4, the outside air temperature range is set for a temperature range in which the outside air temperature is higher than −10 ° C. For example, this is set to a temperature range higher than −15 ° C. When the range is -15 ° C or more and less than -10 ° C, when the water temperature is less than 40 ° C, the allowable maximum number of rotations of the compressor 1 is 85 rps, and when the outside air temperature is less than -15 ° C, In the heating operation, the maximum allowable number of revolutions of the compressor 1 is set to 90 rps (in the case where the water temperature is 40 ° C. or higher, both are 90 rps), and the outside air temperature range is increased in consideration of the case where the outside air temperature is lower. It may be a time table.

  As described above, according to the present invention, the operation of the compressor is controlled by changing the allowable maximum rotational speed of the compressor in accordance with the detected condensing pressure or water temperature and the outside air temperature. Therefore, by appropriately controlling the operation of the compressor according to the operation state of the heat pump cycle device, the amount of frost formation in the heat source side heat exchanger can be suppressed, and the operation control of the heat pump cycle device can be performed efficiently. .

  In particular, at the outdoor temperature where the defrosting operation of the outdoor heat exchanger is necessary during heating operation, the maximum allowable rotation speed of the compressor is set to suppress the amount of frost formation in the outdoor heat exchanger, and within this allowable maximum rotation speed Since the compressor is operated, the frequency of performing the defrosting operation is reduced, and the heating operation can be performed with the rotation speed of the compressor being increased as much as possible. Therefore, the operation of the heat pump cycle device can be controlled more efficiently while appropriately performing the defrosting operation.

DESCRIPTION OF SYMBOLS 1 Compressor 2 Four-way valve 3 Use side heat exchanger 4 1st expansion valve 5 Outdoor heat exchanger 6 Accumulator 10 Control means 11 Indoor unit 12 Refrigerant piping 13 Water piping 14 Injection piping 15 2nd expansion valve 16 Electromagnetic on-off valve 20 Heat Exchange Temperature Sensor 21 Outside Air Temperature Sensor 22 Discharge Temperature Sensor 23 Refrigerant Temperature Sensor 24 Water Temperature Sensor 30 Pressure Sensor 100 Heat Pump Cycle Device

Claims (6)

A heat pump cycle apparatus comprising a refrigerant circuit having a compressor, a use side heat exchanger, an expansion valve, and a heat source side heat exchanger, a condensation pressure detection means, an outside air temperature detection means, and a control means,
The control means includes a compressor rotation speed table storing a maximum allowable rotation speed of the compressor in correspondence with a plurality of condensing pressures and an outside air temperature in the refrigerant circuit,
The control means detects the condensation pressure by the condensation pressure detection means, detects the outside air temperature by the outside air temperature detection means, and detects the condensation pressure and the outside air detected with reference to the compressor rotation speed table. A heat pump cycle device that controls the number of rotations of the compressor within the maximum allowable number of rotations corresponding to a temperature. In the heat pump cycle device according to claim 1,
The compressor rotation speed table has an outside air temperature range in which the outside air temperature is divided by a predetermined value, and an allowable maximum rotation speed of the compressor is set according to the outside air temperature range. apparatus. In the heat pump cycle device according to claim 2,
The compressor rotation speed table includes a first outside air temperature range that requires a defrosting operation of the outdoor heat exchanger and a second outside air temperature range that does not require a defrosting operation of the outdoor heat exchanger. And the allowable maximum number of rotations of the compressor in the first outside air temperature range is lower than the maximum allowable number of rotations of the compressor in the second outside air temperature range. Cycle equipment. A heat pump cycle apparatus comprising a refrigerant circuit having a compressor, a use side heat exchanger, an expansion valve, and a heat source side heat exchanger, a water temperature detection means, an outside air temperature detection means, and a control means,
The control means includes a compressor rotation speed table storing a maximum allowable rotation speed of the compressor in correspondence with a plurality of water temperatures and outside air temperatures in the refrigerant circuit,
The control means detects the water temperature by the water temperature detection means, detects the outside air temperature by the outside air temperature detection means, and corresponds to the water temperature and the outside air temperature detected with reference to the compressor rotation speed table. A heat pump cycle device that controls the rotation speed of the compressor within the allowable maximum rotation speed. In the heat pump cycle device according to claim 4,
The compressor rotation speed table has an outside air temperature range in which the outside air temperature is divided by a predetermined value, and an allowable maximum rotation speed of the compressor is set according to the outside air temperature range. apparatus. In the heat pump cycle device according to claim 5,
The compressor rotation speed table includes a first outside air temperature range that requires a defrosting operation of the outdoor heat exchanger and a second outside air temperature range that does not require a defrosting operation of the outdoor heat exchanger. And the allowable maximum number of rotations of the compressor in the first outside air temperature range is lower than the maximum allowable number of rotations of the compressor in the second outside air temperature range. Cycle equipment.

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