JP5589607B2 - Heat pump cycle equipment - Google Patents

Description

  The present invention relates to a heat pump cycle apparatus such as a heat pump hot / cold water / air conditioner or a heat pump hot water supply apparatus, and more particularly to a heat pump cycle apparatus that performs high-pressure protection of a compressor.

  Conventionally, a heat pump cycle apparatus has a refrigerant circuit in which a compressor, a four-way valve, a use-side heat exchanger, an electronic expansion valve, and an outdoor heat exchanger that is a heat source-side heat exchanger are sequentially connected by piping. doing. When performing heating operation or hot water supply operation with this heat pump cycle device, the refrigerant circuit becomes a heating cycle, and the refrigerant compressed into high-temperature and high-pressure gas by the compressor passes through the four-way valve and heats it with the use side heat exchanger. It is discharged to become liquid refrigerant, further reduced in pressure by the electronic expansion valve, evaporated in the outdoor heat exchanger, exchanged with outdoor air, and converted into gas and compressed again by the compressor. In the cooling / defrosting operation, the refrigerant circuit is in a cooling cycle in which the four-way valve is switched to flow in the direction opposite to the refrigerant flow described above.

  In such a heat pump cycle device, when the outside air temperature is low when the refrigerant circuit is operated in the heating cycle, there is a risk of frost forming on the outdoor heat exchanger, and when the outdoor heat exchanger is frosted, defrosting operation is performed. Need to do. During the defrosting operation, in order to raise the temperature of the outdoor heat exchanger, the refrigerant circuit is switched to the cooling cycle to circulate the refrigerant, and the use side heat exchanger becomes an evaporator, so the temperature increased during the heating cycle operation. The temperature of hot water or room air decreases. Therefore, it is necessary to operate the heat pump cycle device with high capacity in order to raise the temperature of the lowered hot water or room air again when the defrosting operation is canceled (at the time of heating cycle operation return).

  In order to operate the heat pump cycle device with high capacity, it is necessary to greatly increase the rotational speed of the compressor. However, if the rotational speed of the compressor is significantly increased after the defrosting operation, the discharge of the compressor There is a possibility that a phenomenon in which the pressure rapidly increases and temporarily exceeds the allowable pressure of the compressor, that is, so-called overshoot occurs.

  In order to solve the above problems, when the defrosting operation is completed and the heating cycle operation is resumed, the compressor discharge pressure is controlled so as not to significantly increase the compressor speed in a short time. There has been proposed a heat pump cycle device that prevents overshoot (see, for example, Patent Document 1).

  Patent Document 1 discloses a heat pump type hot water supply apparatus having a compressor, a heat exchanger for hot water supply that is a use side heat exchanger, an outdoor heat exchanger, and a control means. When the operation ends and the system returns to the hot water supply operation, even if the target operating frequency corresponding to the target compressor speed is set higher than the operating frequency of the compressor during the defrosting operation, the target operation After the frequency is raised to an operating frequency lower than the target operating frequency without increasing to the frequency at a stretch, the compressor is operated at this operating frequency for a predetermined time, and is increased to the target operating frequency after a predetermined time has elapsed.

As described above, since the operation frequency control of the compressor is performed when the defrosting operation is finished and the heating cycle operation is resumed, the discharge pressure of the compressor suddenly rises to prevent overshoot. Therefore, it is possible to improve the reliability by preventing wear of the mechanical portion of the compressor.
However, the heat pump cycle device as in Patent Document 1 has the following problems.

  Generally, in the heat pump cycle device, when returning to the heating cycle operation after the completion of the defrosting operation, it is necessary to significantly increase the rotation speed of the compressor as described above. Further, it is desirable to increase the rotational speed of the compressor to reach the target rotational speed at the fastest possible rising speed. However, regardless of the state of the refrigerant circuit of the heat pump cycle device, if the speed of increase in the rotation speed of the compressor is set as fast as possible, the water temperature just before the start of the defrosting operation is higher than when the water temperature is low, Since the difference between the discharge pressure of the compressor and the allowable pressure at the time of returning to the heating cycle operation is small, there is a possibility that overshoot occurs.

  With respect to the problems described above, in the heat pump hot water supply apparatus disclosed in Patent Document 1, when the defrosting operation is completed and the hot water supply operation is returned to the hot water supply operation, the rotation speed of the compressor is not increased to the target rotation speed for a predetermined time. The number of revolutions is lower than the number, and overshooting is prevented by taking a long time until the revolution number of the compressor reaches the target revolution number.

  On the other hand, when the water temperature immediately before the start of the defrosting operation is low, the difference between the discharge pressure of the compressor and the allowable pressure when returning to the heating cycle operation is large, and overshoot hardly occurs. There is no problem even if the number of rotations is quickly increased to the target number of rotations. Even in such a state of the refrigerant circuit, in the heat pump type hot water supply apparatus of Patent Document 1, the compressor is operated at a rotational speed lower than the target rotational speed for a predetermined time, and is then increased to the target rotational speed. The heat pump type hot water supply apparatus could not be operated at a high capacity with the shortest startup time corresponding to the state of the refrigerant circuit after completion.

Japanese Unexamined Patent Publication No. 2007-40555 (pages 4 to 5 and FIG. 4)

  The present invention solves the above-described problems and makes it possible to control the rotational speed of the compressor at an increasing speed of the rotational speed of the compressor according to the state of the refrigerant circuit after completion of the defrosting operation. An object is to provide an apparatus.

  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 and a control means, which can perform a defrosting operation of the heat source side heat exchanger, wherein the control means is a value of a plurality of condensing pressures in the use side heat exchanger or is used. The compressor has a compressor speed increase speed table that stores a compressor speed increase speed corresponding to a plurality of water temperature values flowing into the side heat exchanger.

In the compressor rotation speed increase speed table, at least two condensation pressure values or water temperature values having different values among a plurality of condensation pressure values or a plurality of water temperature values correspond to a large condensation pressure or water temperature. The increasing speed of the rotation speed of the compressor is set slower than the increasing speed of the rotation speed of the compressor corresponding to the condensation pressure or the water temperature having a small value. 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 refers to the compressor rotation speed increase speed table, and detects the compression detected based on the condensing pressure or the water temperature. The rotational speed of the compressor is increased to the target rotational speed at the increasing speed of the rotational speed of the machine. The condensing pressure in the compressor speed increasing speed table is detected by the condensing pressure detecting means immediately before starting the defrosting operation, and after the defrosting operation is finished, the determined increase in the compressor speed is increased. The speed of the compressor is increased to the target speed at a speed.

  When the heat pump cycle device of the present invention needs to operate the heat pump cycle device with high capacity after completion of the defrosting operation, the increase rate of the rotation speed of the compressor is determined according to the detected condensing pressure or water temperature. The rotational speed of the compressor is increased to the target rotational speed at the increased speed. As a result, it is possible to increase the compressor speed in the shortest time according to the state of the heat pump cycle device while preventing overshoot of the discharge pressure of the compressor. In addition, the heat pump cycle device can be put into a state of operating with high capacity.

  Further, since the condensation pressure in the rise speed table of the compressor rotation speed is detected by the condensation pressure detection means immediately before starting the defrost operation, the increase speed of the compressor rotation speed when the defrost operation is completed. With reference to the table, the rising speed of the compressor rotation speed can be determined immediately, and the operation of the compressor can be started quickly, so that the heat pump cycle device can be brought into a state of operating at a high capacity more rapidly.

It is a block diagram of the heat pump cycle apparatus in the Example of this invention. It is a raise speed table of the compressor rotation speed in the Example of this invention. It is a flowchart explaining the control by the Example of this invention. It is a raise speed table of compressor rotation speed in other examples of the present 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.
In the following description, the description will be made assuming that the discharge pressure allowable value (allowable pressure) of the compressor 1 is 4.2 megapascal (hereinafter referred to as MPa) or less.

  The use side heat exchanger 3 has a use side heat exchange temperature sensor 20 that detects the temperature of the refrigerant flowing through the refrigerant pipe 12, and an outdoor 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 a refrigerant discharge temperature is detected near the discharge port of the compressor 1, and a refrigerant temperature near the first expansion valve is detected between the use side heat exchanger 3 and the first expansion valve 4. Between the first expansion valve 4 and the outdoor heat exchanger 5, an outdoor heat exchanger temperature sensor 25 for detecting the temperature of the outdoor heat exchanger 5 is installed. Furthermore, a pressure sensor 30 serving as a condensation pressure detecting means is disposed 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 The heat-exchanged water is configured to circulate in the direction of the water flow 62 shown in FIG. Further, an inlet-side water temperature sensor 24, which is a water temperature detecting means, is provided near the water inlet of the use-side heat exchanger 3, and an outlet-side water temperature sensor 26, which is a water temperature detecting means, is provided near the water outlet of the use-side heat exchanger 3. Are installed.

  Further, the heat pump cycle apparatus 100 inputs the temperature detected by each temperature sensor and the condensation pressure detected by the pressure sensor 30, or the compressor 1 and the four directions according to the operation request from the user by a remote controller (not shown). Control means 10 is provided for controlling the heat pump cycle device 100 by controlling the drive of the valve 2, the circulation pump 17, the electromagnetic on-off valve 16, the first expansion valve 4 and the second expansion valve 15. 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, that is, during the heating cycle is indicated by an arrow 60, and the second expansion valve 15 and the electromagnetic opening / closing valve 16 are opened and the refrigerant flows into the injection pipe 14. The refrigerant flow direction is indicated by an arrow 61, and the hot water flow direction in the water pipe 13 is indicated by an arrow 62. In addition, the refrigerant flow direction during cooling operation or defrosting operation, i.e. during the cooling cycle, is opposite to the refrigerant flow direction during heating operation, but the refrigerant flow direction is indicated by arrows. Yes.

  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 controller 10 sets the current water temperature detected by the outlet-side water temperature sensor 26, that is, the temperature of the water heated by the use-side heat exchanger 3, as a target temperature for heating operation determined by the user. The compressor 1 is rotated so that the temperature of water corresponds to. 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.

  In addition, when the outside air temperature is low and a high water temperature is required during heating operation, the control means 10 opens the electromagnetic on-off valve 16 and adjusts the condensing pressure detected by the pressure sensor 30 and the rotation speed of the compressor 1. 2 Open the expansion valve at a predetermined opening to turn on the injection. 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 speed at which the rotation speed of the compressor 1 is increased at the end of the defrosting operation in this embodiment will be described with reference to FIGS. 1 to 3. The storage unit of the control means 10 stores a compressor speed increase speed table A shown in FIG. The compressor rotation speed increase speed table A shows the increase speed of the rotation speed of the compressor 1 (unit: rps / second, how many rps per second) corresponding to the condensation pressure during the heating operation immediately before the start of the defrosting operation. Compressor 1 when the condensing pressure is less than 3.0 MPa, the speed of increase in the rotational speed of the compressor 1 is 1 rps / sec, and the compressor 1 when the condensing pressure is 3.0 MPa or more. The speed of increase in the number of revolutions is set to 0.3 rps / second.

  Here, the reason why the condensing pressure in the rising speed table A of the compressor rotational speed is detected by the pressure sensor 30 during the heating operation immediately before the start of the defrosting operation and is taken into the control means 10 is as follows. . When returning from the defrosting operation to the heating operation, it is necessary to stop the operation of the compressor 1 in order to switch the four-way valve 2 from the cooling cycle to the heating cycle. When the operation of the compressor 1 is stopped, the pressure in the refrigerant circuit is in an equilibrium state, so the condensation pressure detected immediately after the return to heating operation is close to the pressure in the refrigerant circuit in the equilibrium state, It is different from the condensation pressure corresponding to the target water temperature during heating operation.

  On the other hand, during the defrosting operation, the refrigerant circuit is switched and the use side heat exchanger 3 becomes an evaporator, and the water temperature at the time of returning to the heating operation changes compared to the water temperature immediately before the start of the defrosting operation. Therefore, the water temperature will not change significantly. Accordingly, the compressor rotation speed is detected using the condensation pressure detected by the pressure sensor 30 and taken into the control means 10 during the heating operation immediately before the start of the defrosting operation without using the condensation pressure detected immediately after the heating operation is restored. The ascending speed table A is defined.

  The refrigerant circuit of the heat pump cycle apparatus 100 shown in FIG. 1 considers that the condensing pressure detected by the pressure sensor 30 is substantially the same as the discharge pressure of the compressor 1 in a state where a certain time has elapsed after starting operation. Good. Therefore, in the compressor rotation speed increase speed table A in FIG. 2, when the condensation pressure is less than 3.0 MPa, that is, when the discharge pressure of the compressor 1 is less than 3.0 MPa, it is the allowable pressure of the compressor 1. Since the value is small with respect to 4.2 MPa, and the risk of the discharge pressure exceeding 4.2 MPa is low even if the rotational speed of the compressor 1 is suddenly increased, the rising speed is increased to 1 rps / sec. The heat pump cycle device is operated with high capacity.

On the other hand, when the condensing pressure is 3.0 MPa or more, that is, when the discharge pressure of the compressor 1 is 3.0 MPa or more, since there is no room for the allowable pressure of the compressor 1 4.2 MPa, the compression is rapidly performed. Since there is a risk that the discharge pressure exceeds 4.2 MPa by increasing the number of revolutions of the machine 1, the increase speed is reduced compared with the case where the condensation pressure (discharge pressure) is less than 3.0 MPa, and the compressor While the high-pressure protection of 1 is performed, the operation capacity after restarting the heating operation is started as soon as possible.
Note that the speed of increase in the rotational speed of the compressor 1 stipulated in the speed-up table A of the rotational speed of the compressor is determined in advance by a test or the like.

  The operation of the heat pump cycle apparatus 100 that stores the compressor rotation speed increase speed table A described above is as follows. The heating operation of the heat pump cycle device 100 is started by the user operating a remote controller or the like or by starting the timer operation. The control means 10 determines whether or not it is necessary to perform the defrosting operation. If it is necessary to perform the defrosting operation, the controller 10 stops the compressor 1 after taking in and storing the condensation pressure detected by the pressure sensor 30. Then, the heating operation is stopped, and the four-way valve 2 is switched so that the refrigerant circuit is in the cooling cycle to start the defrosting operation.

  During the defrosting operation, the control means 10 takes in the temperature of the outdoor heat exchanger 5 detected by the outdoor heat exchanger temperature sensor 25, and if this temperature becomes equal to or higher than a predetermined temperature (for example, 15 ° C), the compressor 1 is turned on. Stop and stop the defrosting operation, and determine the speed of increase in the rotational speed of the compressor 1 corresponding to the stored condensing pressure immediately before the start of the defrosting operation with reference to the speed-up table A of the compressor speed. . Then, the four-way valve 2 is switched again to be in the heating cycle, and control is performed to increase the rotational speed of the compressor 1 to the target rotational speed corresponding to the set temperature during the heating operation at the determined rising speed.

  In this way, the control means 10 determines the increase speed of the compressor 1 according to the condensation pressure with reference to the compressor rotation speed increase table A, and compresses at this increase speed after resuming the heating operation. Since the rotational speed of the machine 1 is increased to the target rotational speed, it is possible to start up the operating capacity after resuming the heating operation as soon as possible while protecting the compressor 1 with high pressure.

  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 increase speed of the compressor rotation speed according to the present invention. This compressor rotation speed increase speed determination routine determines the increase speed of the compressor 1 rotation speed when the heating operation is resumed. In the main routine, when the heating operation is resumed when the defrosting operation is performed during the heating operation, the rotation speed of the compressor 1 is increased to the target rotation speed at this rising speed.

  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 exit side water temperature sensor 26 detected, ie, a water temperature value (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 the heating operation (ST3-Yes), the control means 10 sets the target compressor 1 so that the detected value of the outlet water temperature sensor 26 becomes the water temperature (target water temperature) corresponding to the set temperature. The rotation speed (target compressor rotation speed) is determined, the operation of the compressor 1 is controlled, and the heating operation is started or continued (ST4).

  Next, the control means 10 determines whether or not the defrosting operation start condition is satisfied (ST5). Specifically, when the temperature of the outdoor heat exchanger 5 detected and taken in by the outdoor heat exchanger temperature sensor 25 is equal to or lower than a predetermined temperature, for example, −5 ° C. or less where frost is generated, the control means 10 In addition, it is determined whether or not the defrosting operation is necessary, such as after a heating operation for a predetermined time.

  When the defrosting operation start condition is not satisfied (ST5-No), the process is returned to ST2. When the defrosting operation start condition is satisfied (ST5-Yes), the control means 10 executes a routine for determining the increase speed of the compressor speed shown in FIG. 3B (ST6), and the compressor speed. When the rising speed determination routine is completed, the process returns to ST2.

  In ST3, when the operation mode is not the heating operation, that is, when the operation is the cooling operation (ST3-No), the control means 10 detects the water temperature (target water temperature) corresponding to the detected value of the outlet side water temperature sensor 26 corresponding to the set temperature. ) To determine the target rotation speed of the compressor 1 (target compressor rotation speed) and control the operation of the compressor 1 to start or continue the cooling operation (ST7). Then, the process is returned to ST2.

  Next, the routine for determining the increase speed of the compressor speed shown in FIG. The control means 10 starts the process of the compressor speed increase speed determination routine, extracts the condensation pressure, stops the operation of the compressor 1 and stops the heating operation (ST11). Specifically, the control means 10 periodically takes in the condensing pressure detected by the pressure sensor 30 and stores it as management data, and extracts the condensing pressure taken in immediately before stopping the heating operation from this management data. .

  In addition to the condensing pressure detected by the pressure sensor 30, the control means 10 detects the outside air temperature detected by the outside air temperature sensor 21, the water temperature detected by the inlet side water temperature sensor 24 and the outlet side water temperature sensor 26, and the discharge temperature sensor 22. Various parameter values necessary for controlling the refrigeration cycle of the heat pump cycle apparatus 100, such as the discharge temperature detected by the outdoor heat exchanger, the temperature of the outdoor heat exchanger 5 detected by the outdoor heat exchanger temperature sensor 25, the number of rotations of the compressor 1, etc. Setting information such as the operation mode and temperature set by the user is stored in the storage unit as management data.

  Next, the control means 10 switches the refrigerant circuit from the heating cycle to the cooling cycle by switching the four-way valve 2 (ST12). Then, the control means 10 starts the defrosting operation with the rotation speed of the compressor 1 and the opening of the first expansion valve 4 as predetermined values (ST13). Specifically, the rotation speed (for example, 70 rps) of the compressor 1 at the time of the defrosting operation that is determined in advance and stored in the storage unit of the control means 10, the condensing pressure immediately before the start of the defrosting operation, and the outlet water temperature. The defrosting operation is performed with the opening degree of the first expansion valve 4 determined with reference to a table in which the opening degree of the first expansion valve 4 is determined according to the water temperature detected by the sensor 26.

  Next, the control means 10 extracts the current temperature of the outdoor heat exchanger 5 (ST14). Specifically, the control means 10 extracts the temperature of the outdoor heat exchanger 5 most recently taken in from the outdoor heat exchanger temperature sensor 25 from the management data described above, and recognizes it as the current temperature of the outdoor heat exchanger 5. ing.

  Next, the control means 10 determines whether or not the temperature of the taken-in outdoor heat exchanger 5 is equal to or higher than a predetermined temperature (a temperature at which no frost formation in the outdoor heat exchanger 5 is considered, for example, 15 ° C. or higher). Is determined (ST15). If the temperature of the outdoor heat exchanger 5 is not equal to or higher than the predetermined temperature (ST15-No), the control means 10 returns the process to ST15.

  If the temperature of the outdoor heat exchanger 5 is equal to or higher than a predetermined temperature (ST15-Yes), the control means 10 stops the operation of the compressor 1 and stops the defrosting operation, and switches the four-way valve 2 to change the refrigerant circuit. Is switched from the cooling cycle to the heating cycle (ST16).

  Next, the control means 10 refers to the compressor rotational speed increasing speed table A, and the rotational speed increasing speed of the compressor 1 corresponding to the condensation pressure taken in immediately before the start of the defrosting operation (taken in ST11). Is determined (ST17). Then, the control means 10 restarts the heating operation and increases the rotation speed of the compressor 1 to the target rotation speed at the determined increase speed (ST18). Then, the process ends.

  As described above, the speed of increase in the rotational speed of the compressor 1 is changed in accordance with the condensation pressure taken immediately before the start of the defrosting operation. Thus, it is possible to start up the operation capacity after resuming the heating operation as soon as possible.

  In the embodiment described above, in the compressor rotation speed increase speed table A in FIG. 2, the rotation speed increase speed of the compressor 1 is divided into 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 but less than 4.2 MPa / 4.2 MPa or more (corresponding to the performance limit discharge pressure of the compressor 1). The speed of increase in the rotational speed of the compressor 1 may be defined in three cases of (condensation pressure).

  Further, in the compressor speed increasing speed table A in FIG. 2, the case where the rising speed is a constant speed has been described. For example, when the condensing pressure is 3.0 MPa or more, the speed of the compressor 1 is changed. While the speed is increased at 0.3 rps / sec, a predetermined time is provided for operating the compressor 1 at a speed lower than the target speed, and after the predetermined time has elapsed, the speed of the compressor 1 is set to 0. 0 again. You may make it raise at 3 rps / sec. Controlling the increase in the rotational speed of the compressor 1 in this way can more reliably prevent the discharge pressure of the compressor 1 from exceeding the allowable pressure due to overshoot.

  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 for controlling the rising speed of the compressor speed, and the effect of changing the rising speed of the compressor speed 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 speed of increase in the rotational speed of the compressor 1 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, so the water temperature corresponding to the condensation pressure (the water temperature uses the value detected by the inlet side water temperature sensor 24). ), The compressor speed increasing speed table B shown in FIG. 4 is stored in the storage unit of the control means 10 to control the speed of increasing the compressor 1 speed. In the compressor rotation speed increase speed table B, the rotation speed increase speed of the compressor 1 (unit: rps / second, indicating how many seconds it is increased by 1 rps) corresponding to the water temperature is defined. When the water temperature is lower than 40 ° C., the speed of increase in the rotational speed of the compressor 1 is 1 rps / second, and when the water temperature is 40 ° C. or higher, the speed of increase in the rotational speed of the compressor 1 is 0.3 rps / second. Yes.

  Further, the control means 10 stores a table in which the water temperature and the condensation pressure obtained in advance by a test or the like correspond to each other (for example, a table having a condensation pressure of 3.0 MPa when the water temperature is 40 ° C.) in the storage unit. I remember it.

  The refrigerant circuit of the heat pump cycle apparatus 100 shown in FIG. 1 may be considered that the condensing pressure estimated from the water temperature is substantially the same as the discharge pressure of the compressor 1 in a state where a certain time has elapsed after starting operation. Therefore, in the compressor rotation speed increase speed table B in FIG. 4, when the water temperature is less than 40 ° C., that is, when the discharge pressure of the compressor 1 is estimated to be less than 3.0 MPa, it is the allowable pressure of the compressor 1. The value is small compared to 4.2 MPa, and even if the number of revolutions of the compressor 1 is suddenly increased and overshoot occurs, the risk of the discharge pressure exceeding 4.2 MPa is low, so the rate of increase is 1 rps / sec. And quickly start up the operating capacity after resuming heating operation.

On the other hand, when the water temperature is 40 ° C. or higher, that is, when the discharge pressure of the compressor 1 is estimated to be 3.0 MPa or higher, there is a possibility that the discharge pressure is close to 4.2 MPa which is the allowable pressure of the compressor 1. If there is a risk that the discharge pressure will exceed 4.2 MPa if the rotation speed of the compressor 1 is suddenly increased and the discharge pressure exceeds 4.2 MPa, the ascent rate is slowed down to 0.3 rps / sec. While maintaining high-pressure protection, start up the operating capacity after resuming the heating operation as soon as possible.
Note that the speed of increase in the rotational speed of the compressor 1 defined in the speed-up table B of the rotational speed of the compressor is obtained in advance by a test or the like.

  The operation of the heat pump cycle apparatus 100 storing the compressor rotation speed increase speed table B described above is as follows. The heating operation of the heat pump cycle device 100 is started by the user operating a remote controller or the like or by starting the timer operation. The control means 10 determines whether or not it is necessary to perform the defrosting operation, and if it is necessary to perform the defrosting operation, the compressor 1 is stopped and the heating operation is stopped, and the refrigerant circuit enters the cooling cycle. The four-way valve 2 is switched to start the defrosting operation.

  During the defrosting operation, the control means 10 takes in the temperature of the outdoor heat exchanger 5 detected by the outdoor heat exchanger temperature sensor 25, and if this temperature becomes equal to or higher than a predetermined temperature (for example, 15 ° C), the compressor 1 is turned on. Stop and stop the defrosting operation. Next, the control means 10 extracts the latest water temperature from the management data stored in the storage unit, and refers to the compressor rotation speed increase speed table B, and the rotation speed of the compressor 1 corresponding to the extracted water temperature. Determine the rate of ascent. Then, the four-way valve 2 is switched again to be in the heating cycle, control is performed to increase the rotational speed of the compressor 1 to the target rotational speed at the determined rising speed, and the heating operation is resumed.

  As described above, since the speed of increase in the rotational speed of the compressor 1 is changed in accordance with the taken-in water temperature, the compressor can be used even in a heat pump cycle apparatus that does not have the condensation pressure detection means (pressure sensor 30 in FIG. 1). While performing the high-pressure protection of 1, the operation capacity after resuming the heating operation as soon as possible can be started in accordance with the state of the refrigerant circuit.

  In the embodiment described above, in the compressor rotation speed increase speed table B in FIG. 4, the increase speed of the rotation speed of the compressor 1 is defined in two cases where the water temperature is less than 40 ° C./more. However, the water temperature is less than 40 ° C./40° C. or more and less than 60 ° C./60° C. or more (water temperature corresponding to the performance limit discharge pressure of the compressor 1). You may prescribe | regulate the raise speed of the rotation speed of the compressor 1 according to a case.

  In the compressor rotation speed increase speed table B in FIG. 4, the case where the increase speed is a constant speed has been described. For example, when the water temperature is 40 ° C. or higher, the rotation speed of the compressor 1 is set to 0. While the speed is increased at 3 rps / sec, a predetermined time is set for operating the compressor 1 at a speed lower than the target speed, and after a predetermined time has elapsed, the speed of the compressor 1 is again set to 0.3 rps / sec. It may be raised in seconds. Controlling the increase in the rotational speed of the compressor 1 in this way can more reliably prevent the discharge pressure of the compressor 1 from exceeding the allowable pressure due to overshoot.

  As described above, according to the present invention, when it is necessary to operate the heat pump cycle device with high capacity after completion of the defrosting operation, the speed of increase in the rotational speed of the compressor is determined according to the detected condensing pressure or water temperature. Then, the rotational speed of the compressor is increased to the target rotational speed at the determined rising speed. As a result, it is possible to increase the compressor speed in the shortest time according to the state of the heat pump cycle device while preventing overshoot of the discharge pressure of the compressor. In addition, the heat pump cycle device can be put into a state of operating with high capacity.

  Further, since the condensation pressure in the rise speed table of the compressor rotation speed is detected by the condensation pressure detection means immediately before starting the defrost operation, the increase speed of the compressor rotation speed when the defrost operation is completed. With reference to the table, the rising speed of the compressor rotation speed can be determined immediately, and the operation of the compressor can be started quickly, so that the heat pump cycle device can be brought into a state of operating at a high capacity more rapidly.

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 DESCRIPTION OF SYMBOLS 20 Use side heat exchange temperature sensor 21 Outside air temperature sensor 22 Discharge temperature sensor 23 Refrigerant temperature sensor 24 Inlet side water temperature sensor 25 Outdoor heat exchange temperature sensor 26 Outlet side water temperature sensor 30 Pressure sensor 100 Heat pump cycle apparatus

Claims (3)

A heat pump cycle device 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, and a control means,
The control means, for at least two condensing pressures of a plurality of condensing pressure values in the use-side heat exchanger, the increasing speed of the compressor rotation speed corresponding to the condensing pressure having a large value is: A compressor rotation speed increase speed table set slower than the compressor rotation speed increase speed corresponding to a small condensation pressure ;
The control means detects the condensing pressure by the condensing pressure detecting means, refers to the compressor speed increasing speed table, and performs defrosting at an increasing speed of the compressor speed corresponding to the condensing pressure. A heat pump cycle device, wherein the rotational speed of the compressor after the operation is ended is increased to a target rotational speed. In the heat pump cycle device according to claim 1,
The condensation pressure in the compressor speed increase speed table is detected by the condensation pressure detection means immediately before starting the defrosting operation,
After completion of the defrosting operation, the heat pump cycle device increases the rotation speed of the compressor to a target rotation speed at the determined increase speed of the rotation speed of the compressor. A heat pump cycle device 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, and a control means,
The control means, for at least two water temperatures having different values out of a plurality of water temperature values flowing into the use side heat exchanger, has an increase rate of the rotational speed of the compressor corresponding to a large water temperature value. A compressor speed increase speed table set slower than the compressor speed increase speed corresponding to a small water temperature ,
The control means detects the water temperature by the water temperature detection means, refers to the compressor rotation speed increase speed table, and at the increase speed of the compressor rotation speed corresponding to the water temperature, after the completion of the defrosting operation. The heat pump cycle apparatus characterized by raising the rotation speed of the compressor to a target rotation speed.