JP5328902B2 - Heat pump equipment - Google Patents

Abstract

It is aimed to provide a heat pump type hot-water supply outdoor apparatus that can control a temperature of a compressor shell, according to a water temperature of a water circuit and a temperature of the compressor. A heat pump type hot-water supply outdoor apparatus 1a includes a refrigeration cycle including a compressor 2, a water-refrigerant heat exchanger 3, an expansion valve 4, and an air heat exchanger 5, a water jacket 10 that is arranged on the shell of the compressor 2 and connected in the middle of a branch water circuit 8 branching in parallel to a main water circuit 7 which starts from a hot water storage tank 30 and returns to the hot water storage tank 30 through a water-refrigerant heat exchanger 3, a water flow valve 9 that is connected between a branch A and the water jacket 10 and regulates the quantity of water flow, according to a control signal, a shell temperature detection sensor 6 that senses a temperature of the shell of the compressor 2, a water temperature sensor 11 that is installed in the vicinity of the branch A and senses a temperature of the water flowing out of the hot water storage tank 30, and a control apparatus 20a that generates a control signal for controlling the water flow valve 9, based on the temperature sensed by the shell temperature detection sensor 6 and the temperature sensed by the water temperature sensor 11, and outputs it to the water flow valve 9.

Description

  The present invention relates to a heat pump type hot water supply outdoor unit.

  Since the compressor of a refrigerating cycle becomes high temperature during operation, it may be desired to be cooled (Patent Document 1). In addition, as a countermeasure against a state where the refrigerant has accumulated in the compressor (referred to as “sleeping”), it may be desired to heat the compressor (Patent Document 2).

(cooling)
In a conventional heat pump hot water supply outdoor unit, a water jacket connected to a flow path branched from a water circuit is wound around the compressor. The temperature of the water jacket is controlled by measuring the outlet temperature of the water jacket with a temperature sensor (for example, Patent Document 1).

(heating)
In addition, there is a technique in which a heating unit that uses hot water is provided in the lower part of the compressor, and the flow rate of the hot water to the heating unit is controlled based on the temperature detected by a temperature sensor that detects the outer temperature of the compressor (for example, Patent Document 2). ).

JP 2002-372318 A (page 5, FIG. 5) JP 2007-298254 A (page 11, FIG. 1)

  In Patent Document 1, the amount of water flowing into a water jacket used in a compressor of a heat pump hot water supply outdoor unit is controlled by the temperature detected by a temperature sensor provided at the outlet of the water jacket. For this reason, the subject that the temperature control of the compressor outer shell according to both the temperature of the water which flows in into a water jacket, and the temperature of a compressor outer shell cannot be performed occurred.

  Further, when the amount of water to the water jacket is controlled only by the outer temperature of the compressor, there is a problem that only one function of heating or cooling the compressor outer shell can be provided.

  An object of the present invention is to provide a heat pump hot water supply outdoor unit capable of controlling the temperature of the compressor shell according to the water temperature and the compressor temperature.

  Another object of the present invention is to provide a heat pump hot water supply outdoor unit having a switching function for switching between heating and cooling of the compressor shell.

The heat pump device of this invention is
A refrigeration cycle comprising a compressor, a condenser, an expansion valve, and an evaporator;
Branching in parallel to the main circuit from the branch on the inflow side and the branch on the outflow side of the main circuit that flows into the condenser from the hot water storage tank and flows out of the condenser and returns to the hot water storage tank A water jacket that is connected in the middle of the branch path and allows water that has flowed out of the hot water storage tank to pass therethrough, and is disposed on the outer shell of the compressor,
An adjustment valve that is connected in the middle of the branch path between the branch on the inflow side and the water jacket, and adjusts the flow rate of water according to the input control signal;
A first temperature sensor for detecting a temperature of the outer shell of the compressor;
A second temperature sensor installed upstream of the regulating valve and detecting the temperature of water flowing out of the hot water storage tank;
Control for generating the control signal for controlling the regulating valve based on the temperature detected by the first temperature sensor and the temperature detected by the second temperature sensor, and outputting the generated control signal to the regulating valve And an apparatus.

The second temperature sensor is
In the vicinity of the branch on the inflow side;
Near the branch path between the branch on the inflow side and the regulating valve;
Upstream of the regulating valve and in the vicinity of the regulating valve;
It is characterized by being installed at any one of the positions.

The heat pump device further includes:
A third temperature sensor for detecting the temperature of the outside air;
The control device includes:
The control signal is generated based on the detected temperature of the first temperature sensor, the detected temperature of the second temperature sensor, and the detected temperature of the third temperature sensor, and the generated control signal is sent to the adjustment valve. It is characterized by outputting.

The control device includes:
Based on the temperature detected by the third temperature sensor, an outside air temperature increase rate indicating an increase rate of the outside air temperature is calculated, and the temperature increase rate of the outer shell of the compressor is calculated based on the temperature detected by the first temperature sensor. A temperature rise rate dependent control signal that is a second control signal for controlling the regulating valve is generated based on the magnitude relationship between the outside temperature rise rate and the outline temperature rise rate. It is characterized by that.

The regulating valve control method of the present invention comprises:
A refrigeration cycle comprising a compressor, a condenser, an expansion valve, and an evaporator;
Branching in parallel to the main circuit from the branch on the inflow side and the branch on the outflow side of the main circuit that flows into the condenser from the hot water storage tank and flows out of the condenser and returns to the hot water storage tank A water jacket that is connected in the middle of the branch path and allows water that has flowed out of the hot water storage tank to pass therethrough, and is disposed on the outer shell of the compressor,
An adjustment valve that is connected in the middle of the branch path between the branch on the inflow side and the water jacket, and adjusts the flow rate of water by receiving control;
A first temperature sensor for detecting a temperature of the outer shell of the compressor;
A heat pump device provided upstream of the regulating valve and comprising a second temperature sensor for detecting the temperature of water flowing out of the hot water storage tank;
The control unit
The adjustment valve is controlled based on a temperature detected by the first temperature sensor and a temperature detected by the second temperature sensor.

  By this invention, the heat pump type hot water supply outdoor unit which can control the temperature of a compressor according to the water temperature of a water circuit and the temperature of a compressor can be provided.

1 is a configuration diagram of a heat pump hot water supply outdoor unit 1a according to Embodiment 1. FIG. FIG. 2 is a hardware configuration diagram of a control device 20a according to the first embodiment. FIG. 6 is a diagram illustrating control by the control device 20a in the first embodiment. 5 is a flowchart for explaining heating control of the compressor 2 by the control device 20a in the first embodiment. 6 is a flowchart for explaining cooling control of the compressor 2 by the control device 20a in the first embodiment. FIG. 3 is a diagram showing an arrangement of water temperature sensors in the first embodiment. The block diagram of the heat pump type hot-water supply outdoor unit 1b in Embodiment 2. FIG.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a heat pump hot water supply outdoor unit 1a (heat pump device) in the first embodiment.

(Refrigerant circuit side)
As shown in FIG. 1, the refrigerant circuit side through which the refrigerant circulates includes a water-refrigerant heat exchanger 3 (condenser), an expansion valve 4, and an air heat exchanger 5 (evaporator) from the discharge side of the compressor 2. Then, it is connected to the suction side of the compressor 2. The compressor 2, the water-refrigerant heat exchanger 3, the expansion valve 4, and the air heat exchanger 5 constitute a refrigeration cycle.

(Water circuit side)
The water circuit side through which the circulation pump 40 circulates water constitutes a main water circuit 7 (main circuit) that returns from the hot water storage tank 30 to the hot water storage tank 30 via the water-refrigerant heat exchanger 3. That is, the main water circuit 7 flows into the water-refrigerant heat exchanger 3 from the hot water storage tank 30 and flows out of the water-refrigerant heat exchanger 3 to return to the hot water storage tank 30.

(Branch water circuit)
As shown in FIG. 1, the branch water circuit 8 (branch path) is connected to the main water circuit 7 in parallel. The branch water circuit 8 branches from the main water circuit 7 before flowing into the water-refrigerant heat exchanger 3 from the main water circuit 7. That is, the branch water circuit 8 branches in parallel to the main water circuit 7 from the branch A on the inflow side and the branch B on the outflow side with respect to the water-refrigerant heat exchanger 3. The branch water circuit 8 is branched from the main water circuit 7 in the branch A before flowing into the water-refrigerant heat exchanger 3, and the water flow valve 9 and the water jacket 10 are connected to flow out from the water-refrigerant heat exchanger 3. It merges into the later main water circuit 7 at branch B.

(Configuration of heat pump hot water supply outdoor unit 1a)
A heat pump hot water supply outdoor unit 1a includes a compressor 2, a water-refrigerant heat exchanger 3, an expansion valve 4, and an air heat exchanger 5, a water flow valve 9 (regulating valve), and a water jacket 10. And an outer shell temperature detection sensor 6 (first sensor), a water temperature sensor 11 (second sensor), and a control device 20a.

(1) The water jacket 10 is connected in the middle of the branch water circuit 8, and is disposed outside the compressor 2. The water jacket 10 allows water flowing from the hot water storage tank 30 to pass through a water flow path formed inside.
(2) The water flow valve 9 is connected in the middle of the branch water circuit 8 between the branch A on the inflow side and the water jacket 10, and adjusts the flow rate of water according to a control signal input from the control device 20a.
(3) The outer temperature detection sensor 6 detects the outer temperature of the compressor 2.
(4) The water temperature sensor 11 is installed upstream of the water flow valve 9 and before the main water circuit 7 flows into the water-refrigerant heat exchanger 3, and the water (water-refrigerant) discharged from the hot water storage tank 30. The temperature of water before flowing into the heat exchanger 3) is detected. FIG. 1 shows a case where the water temperature sensor 11 is installed in the vicinity of the branch A on the inflow side to the water-refrigerant heat exchanger 3.
(5) The control device 20a generates a control signal for controlling the water flow valve 9 based on the detected temperature of the outer temperature detection sensor 6 and the detected temperature of the water temperature sensor 11, and this control signal is used as the water flow valve 9 Output to.

(Hardware configuration of control device 20a)
FIG. 2 is a diagram illustrating a hardware configuration of the control device 20a. In FIG. 2, the control device 20a includes a CPU 810 (Central Processing Unit) that executes a program. The CPU 810 is connected to a ROM (Read Only Memory) 811, a RAM (Random Access Memory) 812, and an I / F (InterFace) unit 816 via the bus 825, and controls these hardware devices.

The ROM 811 is an example of a nonvolatile memory. The ROM 811 stores a program for executing the function of the control device 20a and set values T ₁ and T ₂ described later. The program stored in the ROM 811 is read and executed by the CPU 810. The RAM 812 is an example of a volatile memory. In the RAM 812, the detected temperature from the outer temperature detection sensor 6 and the water temperature sensor 11, the control signal transmitted to the water flow valve 9, the “determination result”, “calculation result”, “generation result”, “processing result” by the CPU 810. ", Data, signal values, variable values, parameters, and the like are stored. The ROM 811 and RAM 812 are examples of a storage device or a storage unit.

  The I / F unit 816 is an example of a communication unit. The I / F unit 816 is connected to the water flow valve 9, the outer shell temperature detection sensor 6, the water temperature sensor 11, and the like.

(Operation of heat pump hot water supply outdoor unit 1a)
Next, the operation of the heat pump type hot water supply outdoor unit 1a will be described with reference to FIG.

(Refrigerant flow)
In the heat pump hot water supply outdoor unit 1a, the high-temperature refrigerant 51 discharged from the compressor 2 flows into the water-refrigerant heat exchanger 3. The high-temperature refrigerant 51 heats the low-temperature water 61 of the main water circuit 7 and then returns to the suction side of the compressor 2 through the expansion valve 4 and the air heat exchanger 5 as the low-temperature refrigerant 52.

(Water flow)
As for the movement on the water side, the low-temperature water 61 flowing from the hot water storage tank 30 by the circulation pump 40 flows into the water-refrigerant heat exchanger 3, heat-exchanges with the high-temperature refrigerant 51, and is heated up. The hot water 62 having a high temperature is returned to the hot water storage tank 30.

  The outline of the basic operation of the heat pump type hot water supply outdoor unit 1a is as follows.

(Basic operation 1: Heating of compressor 2)
First, when the detected temperature T (11) of the water temperature sensor 11 is higher than the detected temperature T (6) of the outer shell temperature detecting sensor 6, the control device 20a,
T (6) <T (11) (Formula 1)
In this case, the water flow valve 9 is opened and water is allowed to flow through the water jacket 10. The compressor 2 is heated by flowing water through the water jacket 10. That is, the control device 20a inputs the detection temperatures (detection signals) of the outer shell temperature detection sensor 6 and the water temperature sensor 11, and compares T (6) and T (11).
T (6) <T (11)
If it is determined, a control signal instructing to open the water flow valve 9 is generated and output to the water flow valve 9.

  In this case, by warming the compressor 2 with heat on the water side, it is possible to prevent stagnation of the refrigerant in the compressor 2 and to improve the startup capability from a state where the outside air is low.

(Basic operation 2: Cooling of compressor 2)
On the other hand, when the detection temperature T (11) of the water temperature sensor 11 is lower than the detection temperature T (6) of the outer temperature detection sensor 6, that is,
T (6)> T (11) (Formula 2)
In this case, the compressor 2 is cooled by opening the water flow valve 9 and flowing water through the water jacket 10. That is, the control device 20a inputs the detected temperatures of the outer shell temperature detection sensor 6 and the water temperature sensor 11, compares T (6) and T (11),
T (6)> T (11)
If it is determined, a control signal instructing to open the water flow valve 9 is generated and output to the water flow valve 9.

  In the case of this basic operation 2, the heat dissipation loss of the compressor 2 can be effectively recovered by absorbing the heat dissipation loss from the compressor 2 and returning it to the main water circuit 7. Moreover, the abnormal overheating prevention of the compressor 2 is realizable without a special protective device.

Note that the control device 200a does not apply (Equation 1) and (Equation 2) as they are. (Formula 1) and (Formula 2) merely show an outline of control of heating and cooling of the compressor 2 by the control device 200a. If (Expression 1) and (Expression 2) are applied as they are, the control device 200a
T (6) = T (11)
In this case, the control for closing the water flow valve 9 is executed, and the control for opening the water flow valve 9 is executed otherwise.
Specifically, for example, the control device 200a executes the following control.

The detection temperature of the sensor is
T (6) <T (11) in the above (Formula 1)
Also satisfy the long set value above T ₁ with the detection temperature of the outer temperature detection sensor 6, not open water flow valve 9 even in the (more when the compressor does not want to heat with water) as good. That is, when there is a detected temperature of the outer temperature detection sensor 6 temperatures T ₁ or more,
That is,
T ₁ ≦ T (6) <T (11) (Formula 3)
In this case, it is not necessary to warm the compressor 2 and the water flow valve 9 is not opened.

Conversely,
T (6)> T (11)
Also satisfy the long set value T ₂ or less there is a detected temperature of the outer temperature detection sensor 6, not open water flow valve 9 even in the (more when the compressor does not want to cool with water) as Good.
T ₂ ≧ T (6)> T (11) (Formula 4)
In this case, it is not necessary to cool the compressor 2 and the water flow valve 9 cannot be opened.

FIG. 3 is a diagram schematically illustrating the cases of (Expression 3) and (Expression 4). The arrow indicates the temperature T. Fig.3 (a) has shown (Formula 3). If namely T (6) is a set value above _{T 1,}
T (6) <T (11)
Even if is established, the control device 20a does not open the water flow valve 9.
FIG. 3B shows (Equation 4). If namely T (6) set value _{T 2} or less,
T (6)> T (11)
Even if is established, the control device 20a does not open the water flow valve 9.

  FIG. 3C is a schematic diagram when the control device 20a performs control reflecting (Equation 3) and (Equation 4).

(T ₁ ≦ T (6) ≦ T ₂ range)
The control device 20a has T (6) as
T ₁ ≦ T (6) ≦ T ₂
In this range, the water flow valve 9 is kept closed regardless of the value of T (11).

(Range of T (6) <T ₁ )
Also,
T (6) <T ₁
In this case, it is necessary to heat the compressor 2. Therefore, under this condition,
T (6) <T (11),
When is established, the control device 20a performs control to open the water flow valve 9.
Also,
T (6)> T (11)
In this case, since the compressor 2 cannot be heated with a water flow, the control for closing the water flow valve 9 is performed.

(Range of T (6)> T ₂ )
T (6)> T ₂
In this case, the compressor 2 needs to be cooled.
Therefore,
T (6)> T (11),
When is established, the control device 20a performs control to open the water flow valve 9.
Also,
T (6) <T (11)
In this case, since the compressor 2 cannot be cooled with a water flow, the control for closing the water flow valve 9 is performed.

Further, temperature control of the compressor 2 by the control device 200a shown in FIG. 3 will be described with reference to FIGS.
FIG. 4 is a flowchart for heating the compressor 2 to prevent the refrigerant from stagnation when the operation of the compressor 2 is started.
FIG. 5 is a flowchart for cooling the compressor 2 to prevent overheating of the compressor 2 during operation of the compressor 2.
4 and 5, it is assumed that the water flow valve 9 is closed before the control by the control device 200a is started.

(In case of heating compressor 2)
First, with reference to FIG. 4, the case where the compressor 2 is heated by the control device 200a when the operation of the compressor 2 is started will be described. The outline of FIG. 4 is as follows. The detected temperature T of the shell temperature detection sensor 6 (6) (hereinafter, also referred to as outer temperature) or is lower than the set value T ₁ (if the compressor 2 is cold) is provided with a further outer temperature T (6) water temperature A detection temperature T (11) of the sensor 11 (hereinafter also referred to as a water temperature detection temperature) is compared. If the detected water temperature T (11) is higher than the outer shell temperature T (6), it can be heated, so the water flow valve 9 is opened and the compressor 2 is heated. Then, when the outer temperature T (6) exceeds the “set value T ₁ + α”, the water flow valve 9 is closed (heating is stopped). Hereinafter, the flowchart of FIG. 4 will be described.

  In S101, the compressor 2 is stopped. It is assumed that the water flow valve 9 is closed.

  In S102, the water flow control of the water jacket 10 by the control device 200a is started. This control prevents the refrigerant (refrigerant stagnation) in which the refrigerant in the refrigeration cycle is dissolved as the liquid refrigerant in the refrigerant oil of the compressor 2 that is stopped.

In S103, the control device 200a compares the outer temperature T (6) with a set value T ₁ (for example, 5 ° C.).
Outer temperature T (6) ≧ set value T ₁
In this case, since heating is not necessary, the control device 200a maintains the closed state of the water flow valve 9 (S109).
on the other hand,
Outer temperature T (6) <set value T ₁
In the case of (2), although heating is required, the controller 200a compares the outer shell temperature T (6) with the water temperature detection temperature T (11) in order to determine whether or not heating is possible by the water flow (S104).
Since heating cannot be performed when the outer shell temperature T (6) ≧ the water temperature detection temperature T (11), the control device 200a maintains the water flow valve 9 in the closed state (S110).
on the other hand,
Outer temperature T (6) <Water temperature detection temperature T (11)
In this case, since heating is possible, the control device 200a executes control to open the water flow valve 9 (S105).

In S106, the control device 200a compares the outer temperature T (6) with “set value T ₁ + α” (for example, T ₁ = 5 ° C., α = 5 ° C.). That is, the control device 200a determines whether or not the compressor 2 has been heated to a necessary temperature “set value T ₁ + α” (10 ° C.). The control device 200a executes control to close the water flow valve 9 when the outer temperature T (11) exceeds the “set value T ₁ + α” (determined that heating is completed) (S107), and the control process ends (S108). ).

(Cooling of compressor 2)
Next, the case where the compressor 2 is cooled by the control device 200a during the operation of the compressor 2 will be described with reference to FIG. The outline of FIG. 5 is as follows. Outer temperature T (6) is higher than the set value T ₂ (compressor 2 is overheated) further compares the outer temperature T (6) the water temperature detected temperature T (11) of the water temperature sensor 11 and. If the detected water temperature T (11) is lower than the outer shell temperature T (6), the cooling is possible. Therefore, the water flow valve 9 is opened and the compressor 2 is cooled. Then, when the outer temperature T (6) becomes less than “set value T ₂ + β”, the water flow valve 9 is closed (cooling is stopped). Hereinafter, the flowchart of FIG. 5 will be described.

  In S201, the compressor 2 is in operation. It is assumed that the water flow valve 9 is closed.

  In S202, water flow control of the water jacket 10 by the control device 200a is started. By this control, overheating of the compressor 2 during operation is prevented.

In S203, the control device 200a compares the outer temperature T (6) with a set value T ₂ (for example, 90 ° C.).
Outer temperature T (6) ≦ set value T ₂
In this case, since cooling is not required, the control device 200a maintains the water flow valve 9 closed (S209).
on the other hand,
Outer temperature T (6)> set value T ₂
In the case of (2), although cooling is required, the control device 200a compares the outer shell temperature T (6) with the detected water temperature T (11) in order to determine whether or not cooling is possible by the water flow (S204).
Outer temperature T (6) ≦ Water temperature detection temperature T (11)
In this case, since the cooling cannot be performed, the control device 200a keeps the water flow valve 9 closed (S210).
on the other hand,
Outer T (6)> Water temperature detection temperature T (11)
In this case, since the cooling is possible, the control device 200a executes control to open the water flow valve 9 (S205).

In S206, the control device 200a compares the outer temperature T (6) with the “set value T ₂ + β” (for example, T = 90 ° C., β = −10 ° C.). That is, the control device 200a determines whether or not the compressor 2 has been cooled to the necessary temperature “set value T ₂ + β” (80 ° C.). The control device 200a executes the control to close the water flow valve 9 when the outer temperature T (11) becomes less than “set value T ₂ + β” (determined that the cooling is completed) (S207), and the control process ends (S207). S208).

(Installation position of water temperature sensor 11)
Next, the installation position of the water temperature sensor 11 will be described with reference to FIG. FIG. 6 is a diagram illustrating the installation position of the water temperature sensor 11. Although FIG. 1 shows the case where the water temperature sensor 11 is installed in the vicinity of the branch A on the inflow side to the water-refrigerant heat exchanger 3, the water temperature sensor 11 is not yet flowed into the water-refrigerant heat exchanger 3. What is necessary is just to detect the water temperature for water. Therefore, as shown as a water temperature sensor 11-1 in FIG. 6, the water temperature sensor is installed in the vicinity of the branch water circuit 8 between the branch A on the inflow side with respect to the water-refrigerant heat exchanger 3 and the water flow valve 9. May be. Alternatively, as shown as the water temperature sensor 11-2, the water temperature sensor may be installed upstream of the water flow valve 9 and in the vicinity of the water flow valve 9 in the branch water circuit 8.

  As described above, the control device 20 a determines the control of the water flow rate valve 9 that supplies water to the water jacket 10 based on the detected temperatures of the outer shell temperature detection sensor 6 and the water temperature sensor 11. For this reason, according to the compressor 2 (temperature of the compressor 2) and water temperature, the waste heat loss from the compressor 2 is collect | recovered, or the electric power for the heat insulation of the compressor 2 can be reduced (standby power reduction). . The outer shell temperature detection sensor 6 is a sensor that originally exists for refrigerant control, and the water temperature sensor 11 is also a sensor that originally exists for hot water temperature control. Therefore, the above-described effects can be obtained without the trouble of adding sensors and the cost increase associated with adding sensors.

Embodiment 2. FIG.
With reference to FIG. 7, the heat pump type hot water supply outdoor unit 1b of the second embodiment will be described. In the second embodiment, the heat pump hot water supply outdoor unit 1b further includes an external air temperature sensor 12 (third temperature sensor) for detecting the external air temperature in contrast to the heat pump hot water supply outdoor unit 1a of the first embodiment.

  In the first embodiment described above, the control device 20a determines the control of the water flow valve 9 from the detected temperature of the outer shell temperature detection sensor 6 and the detected temperature of the water temperature sensor 11. In the second embodiment, the control device 20b also uses the detected temperature of the outside air temperature sensor 12.

  FIG. 7 is a configuration diagram of the heat pump hot water supply outdoor unit 1b according to the second embodiment. FIG. 7 differs from FIG. 1 of the first embodiment in that an outside air temperature sensor 12 is arranged. Accordingly, the function of the control device 20b is slightly different from that of the control device 20a. That is, the control device 20b controls the water flow valve 9 for flowing water through the water jacket 10 according to three types of detection temperature: the detection temperature of the outer temperature detection sensor 6, the detection temperature of the water temperature sensor 11, and the detection temperature of the outside air temperature sensor 12. The determination is based on the detected temperature. That is, the control device 20 b generates a control signal for the water flow valve 9 based on the detected temperatures of the three types of sensors and outputs the control signal to the water flow valve 9.

  In addition to the generation of the control signal in the first embodiment, the control device 20b generates the following control signal (temperature rise rate dependent control signal) and outputs it to the water flow valve 9. That is, the control device 20b determines that the increase rate of the outside temperature per unit time (detected by the outside temperature sensor 12) is the increase rate per unit time of the outside temperature of the compressor 2 (detected by the outside temperature detection sensor 6). If it is faster, it is determined that the amount of refrigerant stagnation in the compressor 2 is large, and a control signal for instructing the OPEN to the water flow valve 9 is generated and output to the water flow valve 9. That is, in this case, not the magnitude of the detected temperature, but the rising speed (speed) of each detected temperature is set as a determination target.

  By this control, it is possible to provide a heat pump hot water supply outdoor unit that is further excellent in reliability. Since the outside air temperature sensor 12 is also a sensor that originally exists for refrigerant control, the above-described effects can be obtained without increasing the cost of the sensor or adding the sensor.

This will be described more specifically. The stagnation of the refrigerant occurs only when the compressor 2 is stopped.
When the compressor 2 starts moving in a state in which the refrigerant has stagnation while the compressor 2 is stopped (a state in which the lubricating oil in the compressor is diluted with the refrigerant), seizure or the like occurs due to poor lubrication of the sliding portion of the compressor 2. While the compressor is stopped, the refrigerant in the refrigerant circuit condenses in the coolest part of the refrigerant circuit and collects as a liquid (sleeps). When the outer temperature of the compressor 2 is low, it is certain that the refrigerant easily stagnates into the compressor 2, but strictly speaking, it is not an absolute value of the compressor outer temperature. The parts where the temperature rise speed of each part of the refrigerant circuit is slower than the rise speed of the outside air temperature (ambient temperature) are cooler at that time, so the refrigerant tries to gather there. Note that these phenomena are only during the stop of the compressor 2. In general, the compressor 2 has a large heat capacity (not easily warmed) among the refrigerant circuit components, so that the refrigerant collects (sleeps) in the compressor 2. Therefore, by adding the outside air temperature sensor 12, if it becomes possible to detect the difference between the rising speeds of the outside air temperature and the outside temperature of the compressor 2, it is determined whether or not the refrigerant is likely to stagnate in the compressor 2. Can be determined. That is, in the case of Embodiment 2, the control device 20b first compares the temperature change width per unit time between the outside air temperature and the compressor outer temperature. When the outside air temperature has a larger variation width in the direction of temperature rise than the outer temperature of the compressor 2, the control device 20 b
That is,
If the temperature rise rate of the outside air temperature is greater than the temperature rise rate of the compressor outer shell, it can be determined that the refrigerant 2 is likely to stagnate in the compressor 2 (the region to be heated). carry out.
However, regarding the detection temperature T (6) of the outer temperature detection sensor 6 and the detection temperature T (11) of the water temperature sensor 11,
T (6)> T (11)
In this case, since the compressor 2 cannot be heated even if the water flow valve 9 is opened, the control device 20b performs control for closing the water flow valve 9 in this case.

  In the first embodiment, the water temperature in the hot water storage tank 30 may be affected (temperature decrease) by flowing water through the water jacket 10, and in order to flow the water through the water jacket 10 (to its channel resistance) Since it may be necessary to increase the output of the circulation pump 40 (to overcome), it is conceivable that the power consumption of the entire system increases. In this case, by adding the outside air temperature sensor 12, it is possible to determine whether or not the refrigerant 2 is likely to stagnate in the compressor 2 as compared with the case where two sensors of the outer temperature detection sensor 6 and the water temperature sensor 11 are used. Can be improved. Thereby, while being able to suppress the influence on the water temperature in the hot water storage tank 30, the increase in the power consumption of the circulation pump 40 can be suppressed.

  In the first and second embodiments described above, the water flow valve 9 has been described as a stop valve that performs “close / open”, but this is an example. The function of the water flow valve 9 may be a function capable of adjusting the flow rate of water in multiple stages. The control device 20a (or the control device 20b) generates and outputs a control signal corresponding to multiple stages based on the detected temperature of the sensor. What control signal is generated is programmed in advance. Further, the function of the water flow valve 9 may be a function capable of continuously adjusting the flow rate of water. Also in that case, the control device 20a (or the control device 20b) generates and outputs a control signal corresponding to the continuous adjustment based on the detected temperature of the sensor. What control signal is generated is programmed in advance.

Although the heat pump device has been described in the first and second embodiments, this heat pump device can also be grasped as a regulating valve control method in which the control device controls the water flow valve (regulating valve). That is,
A refrigeration cycle comprising a compressor, a condenser, an expansion valve, and an evaporator;
Water jacket 10;
Connected in the middle of the branch path between the branch on the inflow side and the water jacket, and according to the input control signal, a water flow valve 9;
Outer temperature detection sensor 6;
For a heat pump device equipped with a water temperature sensor 11,
Based on the detected temperature of the outer shell temperature detection sensor 6 and the detected temperature of the water temperature sensor 11, the control device can be grasped as an adjustment valve control method for controlling the water flow rate valve 9.

  1a, 1b Heat pump hot water supply outdoor unit, 2 compressor, 3 water-refrigerant heat exchanger, 4 expansion valve, 5 air heat exchanger, 6 outer temperature detection sensor, 7 main water circuit, 8 branch water circuit, 9 water flow rate Valve, 10 Water jacket, 11 Water temperature sensor, 12 Outside air temperature sensor, 20a, 20b Control device, 30 Hot water storage tank, 40 Circulation pump.

Claims (2)

A refrigeration cycle comprising a compressor, a condenser, an expansion valve, and an evaporator;
Branching in parallel to the main circuit from the branch on the inflow side and the branch on the outflow side of the main circuit that flows into the condenser from the hot water storage tank and flows out of the condenser and returns to the hot water storage tank A water jacket that is connected in the middle of the branch path and allows water that has flowed out of the hot water storage tank to pass therethrough, and is disposed on the outer shell of the compressor,
An adjustment valve that is connected in the middle of the branch path between the branch on the inflow side and the water jacket, and adjusts the flow rate of water according to the input control signal;
A first temperature sensor for detecting a temperature of the outer shell of the compressor;
A second temperature sensor installed upstream of the regulating valve and detecting the temperature of water flowing out of the hot water storage tank;
Control for generating the control signal for controlling the regulating valve based on the temperature detected by the first temperature sensor and the temperature detected by the second temperature sensor, and outputting the generated control signal to the regulating valve Equipment ,
A third temperature sensor for detecting the temperature of the outside air;
With
The controller is
Based on the temperature detected by the third temperature sensor, an outside air temperature increase rate indicating an increase rate of the outside air temperature is calculated, and the temperature increase rate of the outer shell of the compressor is calculated based on the temperature detected by the first temperature sensor. A temperature rise rate dependent control signal that is a second control signal for controlling the regulating valve is generated based on the magnitude relationship between the outside temperature rise rate and the outline temperature rise rate. A heat pump device characterized by that. Before Symbol control device,
The control signal is generated based on the detected temperature of the first temperature sensor, the detected temperature of the second temperature sensor, and the detected temperature of the third temperature sensor, and the generated control signal is sent to the adjustment valve. The heat pump device according to claim 1, wherein the heat pump device outputs the heat pump device.

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