JPH09236332A - Heat pump apparatus for air conditioning - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pump apparatus for air conditioning capable of properly reducing an overload of a compression part. SOLUTION: This air conditioning heat pump apparatus 100 cools indoor air by compressing a heat operation fluid in a compression part 2 to heat exchange the fluid with fresh air in a heat exchanger 5, and then heat exchanging the fluid with indoor air in a heat exchanger 81. When fresh air temperature flowing through the heat exchanger 5 is high, a driving source 1 of the compression part 2 is overloaded. An overload is reduced by reducing a flow rate of the heat operation fluid to the heat exchanger 81 by making use of a flow rate adjusting valve V1 and reducing an air volume from an air fan F1. In the case where a plurality of indoor machines 80 are disposed, those machines are subjected successively prior to the reduction of the overload from those having lower indoor air temperatures detected by a temperature sensor D6. Although in the case where the flow rate of the heat operation fluid is only reduced, condensation is produced at a portion located more behind in the course of the flow passage in the heat exchanger 81, provided both of the reduction of the flow rate and the reduction of the air volume are performed parallely, the flow passage is uniformly cooled from an inlet to an outlet without causing condensation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioning heat pump device for performing air conditioning in a room, such as cooling and heating, by a heat pump action of a heat-operated fluid.

[0002]

2. Description of the Related Art A heat pump device 100 for air conditioning.
For example, as shown in FIG. 7, a heat source for cooling, for example, a heat source for cooling, or a heat source for heating, for example, a heat source for heating, etc., is generated by the thermally operated fluid pressurized in the compression unit 2. A cooling load in which a heat source from the heat source device 10 for obtaining the heat source is placed in a room, or a heating load, for example, a configuration in which the cooling operation or the heating operation is performed by applying the heating source to the indoor unit 80 for air conditioning. It is well known.

However, the air-conditioning heat pump device according to the present invention may be a heat pump device adapted to perform only the above-described cooling operation, for example, a cooling load only for cooling equipment or a cooling display case for food or the like. It includes. In addition, in the present invention, the term "indoor" includes the inside of the enclosure such as the above cooling display case.

In FIG. 7, a circuit portion indicated by a thick line is a conduit of a heat-operated fluid for obtaining a heat source, for example, a refrigerant, and a circuit portion indicated by a thin line is an electric detection signal / control signal. And the heat source device 10 is
Since it is placed outdoors, it is also called an outdoor unit, but it may be placed indoors. Also, in general, one heat source unit 10
Is configured to supply a heat source to one indoor unit or a plurality of indoor units.

Then, a compressor of the compression section 2, for example, a rotary compressor is driven by a drive source 1 such as an engine to obtain a heat source, a heat-operated fluid such as Freon R.
22, refrigerant such as Freon R137, etc. is supplied to the flow path switching unit 3 via an oil separator (not shown) for separating the oil that has been mixed with the heat-operated fluid in the compressor, and the heat exchange described later. The heat-operated fluid whose pressure has been reduced after the required heat operation by the vessel 5 and the heat exchanger 81 is supplied to the compression section 2 again via an accumulator (not shown). An internal combustion engine or electric motor is used.

The flow path switching unit 3 cools the indoor unit 80,
For example, when performing the cooling operation, the heat exchanger 81 on the indoor unit 80 side is connected so as to operate as an endothermic heat exchanger, and the heat exchanger 5 on the heat source unit 10 side is connected to the heat radiating unit described above. When connecting the pipes so as to operate as an exchanger, and when performing the heating operation of the indoor unit 80, for example, the heating operation, the heat exchanger 5 on the heat source device 10 side is the heat absorbing heat exchanger. And the indoor unit 80
The heat exchanger 81 on the side is a portion that connects the respective pipe lines so as to operate as a heat radiating heat exchanger, and is, for example, a flow path switching mechanism that electrically operates a switching valve such as a four-way valve.

The heat exchanger 5 is a meandering pipe through which a heat-operated fluid is provided with a large number of fins and is provided with a blower F2 for blowing the outside air and venting the air in the direction of the arrow to radiate or release the outside air. Since it is a heat exchanger that absorbs heat from the outside and exchanges heat with the outdoor air, it is generally called an outdoor heat exchanger.

The heat exchanger 81 has the same structure as that of the heat exchanger 5, and provides the indoor air recirculation by ventilating in the direction of the arrow by the blower F1 to absorb heat from the indoor air during the cooling operation. The heat exchanger is designed to radiate heat to the room air during the heating operation, and heat is exchanged with the room air, so it is generally called an indoor heat exchanger.

During the cooling operation, the heat exchanger 5 operates as a condenser, and the heat exchanger 81 operates as an evaporator. During the heating operation, the heat exchanger 81 serves as a condenser and the heat exchanger 5 also.
Will operate as an evaporator.

On the heat source device 10 side, detected values of the temperature and pressure of required parts of the heat operating fluid on the heat source device 10 side, for example, the pressure of heat operation on the discharge side of the heat operating fluid of the compression part 2 are detected. Pressure detector D7 and a temperature detector D8 for detecting the temperature thereof, that is, a pressure detector D9 for detecting the pressure of the heat operating fluid of the compression section 2, that is, a pressure on the suction side, and a temperature for detecting the temperature thereof. Drive of detector D10, temperature detector D2 / temperature detector D3 for detecting each temperature of the inlet side and outlet side of the heat operation fluid in the heat exchanger 5, temperature detector D1 for detecting the temperature of the outside air, and compression unit 2 Each detection value by a rotation speed detector D11 or the like for detecting the rotation speed of the drive shaft of the source 1,
Each set value set from the setting operation unit 6 is given to the control unit 7.

Further, on the indoor unit 80 side, detected values such as the temperature of the thermally operated fluid on the indoor unit 80 side and the temperature of the object, for example, the inlet side and the outlet side of the thermally operated fluid in the heat exchanger 81, respectively. Temperature detector D4 / temperature detector D5 for detecting temperature,
Each detection value of the temperature detector D6 that detects the temperature of the intake side of the indoor air in the heat exchanger 5 and each set value of the set temperature that is the control target of the cooling operation or the heating operation set from the setting operation unit 83, etc. To the control unit 7.

Further, the control section 7 and the control section 82 mutually transmit and receive required detection values and set values, and the control processing of the control section 7 is performed by these respective values. Depending on the function, a control signal for operating the compression unit 2
While controlling the operation by giving the drive source 1 from the control unit 7,
Control such as adjustment control of the flow rate adjusting unit 4 that adjusts the flow rate of the heat operation fluid sent to the indoor unit 80 side is performed.
The control processing function of the controller 82 controls the flow rate adjusting valve V1 and the blower F1 based on a command from the controller 82 itself or the controller 7.

The control unit 7 and the control unit 82 are mainly constituted by a control processing function (hereinafter referred to as CPU) by a microcomputer, and for example, as shown in FIG. 8, a commercially available CPU board is used. It is configured by using the (CPU / B) 70, and inputs each detection signal obtained by detecting the state of each part and each operation signal input by operating the setting operation part 6 or the setting operation part 83. It is obtained by taking in the data as input data from the input / output port 71 and storing it in the working memory 73, and performing the required control processing based on these input data and the program and control data of the processing flow stored in advance in the processing memory 72. Each control signal for controlling each unit is output from the input / output port 71.

If necessary, the clock circuit 74 measures the time required for the control process, and the display unit 75 is configured to display the operating state, control state, and setting state of each unit. A communication connection terminal 76 for transmitting and receiving control data and the like is provided by a communication path 77 between the control unit 7 and the control unit 82, for example, an extension line of a bus line or a communication cable. Connection terminal 7
6 is configured by a communication connection terminal using a communication IC such as RS485 standard, if necessary.

In the configuration of FIG. 7, one heat source device 10 is used.
To one indoor unit 80 (hereinafter, "1
It is called "indoor unit configuration", but one heat source unit 1
A configuration in which a plurality of indoor units 80 are connected to 0 (hereinafter,
"Multiple indoor unit configuration") is also well known. In the latter case, the entire control function is controlled by the control unit 7 of the heat source device 10.
There is a well-known configuration that is configured to be performed by the above and a configuration that is configured to be performed by an integrated control device that is separately provided.

The air conditioning heat pump device 10 as described above
In order to eliminate the adverse effects caused by the abnormal temperature rise and pressure rise of the thermal operation fluid on the discharge side of the compression section 2 which occurs when the temperature of the outside air becomes equal to or higher than a predetermined value during the cooling operation of 0,
Outside temperature temperature detector D1 and condensation temperature temperature detector D3
When the detected values of and become equal to or higher than the respective predetermined values, the flow rate of the flow rate adjusting valve V1 of the heat exchanger 81 on the indoor side is reduced and adjusted, and the drive speed of the drive source 1 of the compression unit 2, for example, A configuration (hereinafter, referred to as a first conventional technology) in which the rotational speed of an engine or an electric motor is reduced and adjusted is disclosed in Japanese Patent Application Laid-Open No. 3-177758 based on the prior application of the applicant of the present application.

[0017]

In the above-mentioned "1 indoor unit configuration", even when the heat operation capacity of the heat source unit 10 and the heat operation capacity of the indoor unit 80 have the same capacity, the cooling operation is performed. However, when the outside air temperature is high, or when the environment in which the heat exchanger 5 is placed is so bad that part of the heat radiated by the blower F2 is returned to the heat exchanger 5, the heat radiated by the heat exchanger 5 becomes insufficient. As a result, an overload condition occurs, the pressure of the heat-operated fluid on the discharge side of the compression unit 2 becomes too high, and the safety valve operates, or the drive source 1 of the compression unit 2, that is, the engine or the electric motor is overloaded. Then, there is an inconvenience that the entire apparatus stops.

In the case of the above-mentioned "plural indoor unit configuration", generally, the total heat operating capacity of each indoor unit is larger than the heat operating capacity of the heat source unit 10, for example, a maximum of 130.
Since the capacity is set to about%, the same overload state as described above is caused during the cooling operation even when the outside air temperature is relatively low, and the entire apparatus stops operating.

In order to solve the above-mentioned inconvenience, the flow rate of the flow rate adjusting valve V1 of the heat exchanger 81 is reduced and adjusted as in the above-mentioned first prior art, and the drive speed of the drive source 1 of the compression section 2 is reduced. Although it is effective to provide a configuration for reducing the flow rate, if the flow rate of the flow rate adjusting valve V1 of the heat exchanger 81 operating as the evaporator is reduced and adjusted, the following inconvenience occurs.

That is, when the flow rate of the flow rate adjusting valve V1 is in a steady state, the condensed heat-operated fluid is the heat exchanger 81.
Since the air is gradually evaporated from the inlet side to the outlet side, completely evaporated at the outlet side, and is discharged in a saturated gas state, the indoor air ventilated by the blower F1 into the heat exchanger 81 is There is an average cooling across the fins in 81.

Therefore, since the dehumidification of the indoor air ventilated in the heat exchanger 81 is also performed on average, there is no dew condensation, but if the flow rate of the flow rate adjusting valve V1 is reduced and adjusted, the heat-operated fluid will be removed. Evaporation is exhausted in the part that does not reach the outlet side, and from that point onward to the outlet side, it will be in the form of high-temperature superheated gas and flow, so dehumidification is insufficient at the part near the outlet side. Because,
Condensation will occur, and the condensed water will drip into the room,
Accident such as dew condensation rots and causes mold.

Therefore, there is a problem that it is desired to provide a heat pump device for air conditioning without such inconvenience.

[0023]

SUMMARY OF THE INVENTION According to the present invention, a condensed heat-operated fluid obtained by condensing a required heat-operated fluid pressurized in a compression section as described above by heat exchange with the outside air is exchanged with room air. Performs a cooling operation to cool the indoor air by giving it to a heat exchanger that performs heat exchange and evaporating it, and when the compression section is overloaded, an overload to reduce this overload. In an air conditioning heat pump device that performs a reduction operation,

By reducing the flow rate of the condensation heat operating fluid flowing through the heat exchanger and reducing the flow rate of the indoor air flowing through the heat exchanger in parallel, the above-mentioned overload reduction is achieved. A first configuration for providing an overload reducing means for operating,

In the air conditioning heat pump device having the same structure as the first structure, the temperature difference between the heat operating fluids on the inlet side and the outlet side of the heat exchanger exceeds the first predetermined value and the second predetermined value. Within the range until reaching, the flow rate of the condensation heat operating fluid flowing through the heat exchanger is reduced, and the flow rate of the indoor air flowing through the heat exchanger is reduced in parallel. First overload reducing means for performing the overload reducing operation of

When the temperature difference reaches the second predetermined value, the overload reducing operation is performed only by reducing the flow rate of the indoor air flowing through the heat exchanger. A second configuration including an overload reducing means,

The condensed heat-operated fluid obtained by condensing the required heat-operated fluid pressurized in the compression section by heat exchange with the outside air is supplied to a plurality of heat exchangers for heat exchange with the room air to evaporate. While performing the cooling operation to cool the indoor air by doing, when the compression unit is overloaded, in the air conditioning heat pump device for performing an overload reduction operation for reducing this overload,

Among the plurality of heat exchangers described above, the heat exchanger having the lowest temperature of the indoor air is preferentially selected and sequentially subjected to the above-mentioned overload reducing operation. Reduction means,

Within the range in which the temperature difference between the inlet and outlet sides of the heat-operated fluid of the heat exchanger selected by the above selection exceeds the first predetermined value and reaches the second predetermined value,
A reduction in the flow rate of the condensed heat operating fluid flowing through the heat exchanger, and a reduction in the flow rate of the indoor air flowing through the heat exchanger in parallel with the first overload reduction operation, That is, a first overload reducing unit that performs the first reducing operation,

When the temperature difference of the heat exchanger selected by the above selection reaches the second predetermined value, only by reducing the flow rate of the room air flowing through the heat exchanger. A third configuration in which a second overload reducing operation, that is, a second overload reducing unit that performs a second reducing operation is provided;

In addition to the third structure, when releasing the above reduction, the temperature of the room air is highest among the above plurality of units, and the heat reducing the second reduction operation is performed. Among the plurality of units, the temperature of the indoor air is highest and the first reducing operation is performed after the exchanger is selected preferentially and the second reducing operation is sequentially canceled. The above problem is solved by a fourth configuration in which the heat exchanger is preferentially and sequentially provided with load reduction canceling means for canceling the first reduction operation.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION As an embodiment of the present invention, an embodiment in which the present invention is applied to the air conditioning heat pump device 100 shown in FIG. 7 will be described.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to FIGS.
1 to 6, portions indicated by the same reference numerals as those in FIGS. 7 and 8 are portions having the same functions as the portions having the same reference numerals described in FIGS. 7 and 8. Further, the portions indicated by the same reference numerals in FIGS. 1 to 6 are portions having the same functions as the portions of the same reference numerals described in any of FIGS.

[First Embodiment] First, a first embodiment will be described with reference to FIGS. The configuration of FIG. 1 is similar to that of the configuration of FIG.
-The blower F2, the heat exchanger 81, the blower F1 and the like are shown in a more specific configuration, and the control unit 7, the control unit 82, the setting operation unit 6 and the setting operation unit 83 are omitted. It is a thing.

In FIG. 1, the heat exchanger 5 and the blower F2 are arranged such that two sets of heat exchangers 5 are opposed to each other with the blower F2 inside and the one side is surrounded by a blocking plate 5C.
By ventilating as shown by the arrow, the heat exchange between the heat exchanger 5 and the outside air can be performed more effectively.

Further, the flow rate adjusting section 4 includes a flow rate adjusting valve V2
The check valve V3 and the storage tank 4A are provided, and the flow path switching unit 3 passes through the flow path indicated by the broken line in the heating operation,
In the case of the cooling operation, the switching operation is performed by the control unit 7 (not shown) so as to pass through the flow path indicated by the solid line.

Therefore, during the heating operation, the heat-operated fluid is transferred from the compressor 2A to the flow path switching unit 3 to the heat exchanger 81 to the flow rate adjusting valve V1 to the storage tank 4A to the flow rate adjusting valve V2 to the heat exchanger 5. The flow passage switching unit 3 → the accumulator 2B → the compressor 2A is circulated in the path, and during the cooling operation, the heat operation fluid, that is, the refrigerant, is compressed from the compressor 2A → the flow passage switching unit 3 →
Heat exchanger 5-> check valve V3-> storage tank 4A-> flow control valve V1
→ heat exchanger 81 → flow path switching unit 3 → accumulator 2B →
It circulates in the path of the compressor 2A.

Further, the flow rate adjusting valve V1 and the flow rate adjusting valve V2
In both cases, the flow rate can be adjusted by adjusting the opening / closing in steps of about 500 steps from the closed state to the fully open state of the valve. In the steady cooling operation, the temperature difference (T2-T1) between the detected temperature value T1 of the temperature detector D4 and the detected temperature value T2 of the temperature detector D5 is set to a predetermined value of 0 to 1 ° C in the flow rate control valve V1. When the temperature difference exceeds a predetermined value, the opening degree of the flow rate adjusting valve V1 is increased by a predetermined step amount, for example, +1 step, and when the temperature difference is less than the predetermined value, the flow rate adjusting valve V1 is opened. The opening degree is controlled to be reduced by a predetermined step amount, for example, -1 step. The control operation in the following description does not include the control operation of the flow rate adjusting valve V2. Therefore, the flow rate adjusting valve V2 is required to perform the above heating operation, that is,
Other types of valves may be used as long as they can operate as an expansion valve.

The blower F1 and the blower F2 are both
From the state of the blast stop to the maximum wind force state, for example,
The air flow rate can be adjusted in about 50 steps, and for example, it is an air blower having an automatic transformer type tap switching or a drive voltage variable configuration by triac control.

Although not shown in FIG. 1, the outdoor unit 10 and each indoor unit 80 are provided with the control unit 7.82 and the setting operation unit 6.83 described with reference to FIGS. The control process flow for performing the normal cooling operation and the heating operation, and the temperature detection of the outside air temperature detector D1 and the condensation temperature, respectively, similarly to the configuration described in the first prior art. When the detected values of the device D3 and the detected values become equal to or more than the respective predetermined values, the flow rate control valve V1 of the indoor heat exchanger 81
The control processing flow for reducing and adjusting the flow rate of, and reducing and adjusting the drive rotation speed of the drive source 1 of the compression unit 2, and the data of each predetermined value are stored in each processing memory 72.
In this control processing, the outside air temperature detected by the temperature detector D1 and the discharge pressure of the heat-operated fluid from the compression unit 2 detected by the pressure detector D7 are the same as the [outside air temperature / compression discharge pressure characteristic] in FIG. Since it changes like a pressure change, the safety valve operates and the entire device is shut down.
For example, the pressure limit point PL before reaching 2.6 MPa,
For example, it is controlled so as not to exceed 2.3 to 2.4 MPa.

Further, in order to achieve the object of the present invention, a program of a control processing flow for performing the cooling operation described later with reference to FIGS. 2 and 3 and data of a predetermined value are stored in each processing memory 72. When the compression section 2 is in an overloaded state, the air flow rate of the blower F1 and the flow rate of the flow rate adjusting valve V1 are adjusted to reduce the overload.

[Determination of Overload State] “Determination of overload state” in the control processing flow of FIG. 2 is performed using, for example, one of the following two determination methods.

In the first overload state judging method, the detection value of the pressure detector D7 is [outside air temperature / compression discharge pressure characteristic] in FIG.
When the pressure limit point PL is reached, it is determined that the compression unit 2 is in the overload state.

The second method for determining the overload state is to use the compressor 2 as shown in [compression drive rotation speed / compression drive output characteristic] in FIG.
The relationship between the drive output PS of the drive source 1 of A, for example, the drive shaft of the engine or the electric motor, and the drive output PS, that is, the data of the drive output change obtained in advance is stored in the processing memory 72 of the control unit 7. , The current drive output PS is obtained from the current rotational speed rpm detected by the rotational speed detector D11, and each detected value detected by the pressure detector D7, the pressure detector D9, the temperature detector D8, and the temperature detector D10, etc. An arithmetic expression for obtaining the required driving force PSA from, for example, an empirical equation is stored in the processing memory 72 of the control unit 7, and the required driving force PSA obtained from this arithmetic expression is a safe value of the drive output PS, for example, When the limit value PSL of 90% of the drive output PS is reached, it is a method of determining that the compression unit 2 is in the overload state.

[Order of Overload Reduction] The overload reduction in the control process flow of FIG. 2 is configured to perform a two-step reduction process of a first reduction and a second reduction.

In the steady cooling operation, the temperature difference between the inlet side and the outlet side of the condensed heat-operated fluid flowing through the heat exchanger 81, that is, the detection value T1 of the temperature detector D4 and the detection of the temperature detector D5. Although the temperature difference (T2-T1) from the value T2 is controlled to fall within the range of 0 to 1 ° C, for example, when the compression unit 2 becomes overloaded, first the primary reduction is performed. When further overload reduction is required, control processing is performed so as to perform the secondary reduction.

In the first reduction, the value of the temperature difference (T2-T1) is the first predetermined value TA, for example, 1 °.
By controlling so as to reduce the opening degree of the flow rate adjusting valve V1 and reduce the air volume of the blower F1 in parallel in a range exceeding C and reaching a second predetermined value TB, for example, 10 ° C. The overload of the compression unit 2 is reduced by setting the amount and temperature of the heat operation fluid returning to the compression unit 2 to steady values.

That is, in the first reduction, although the flow rate of the heat-operated fluid flowing through the heat exchanger 81 becomes too small, the flow rate of the room air flowing through the cooling fins of the heat exchanger 81 is also reduced. The heat-operated fluid is transferred to the heat exchanger 8
The evaporation does not end in the middle of the flow path in 1 and ends in the vicinity of the outlet of the flow path, so that dew condensation does not occur on the cooling fins in the latter half of the flow path.

This first reduction is due to the temperature difference (T2-
When the value of (T1) reaches a second predetermined value TB, for example, 10 ° C, the control shifts to the secondary reduction, and in the secondary reduction, control is performed so that only the blower F1 is reduced, Exchanger 81
By reducing the flow rate of the room air flowing through the cooling fins, the heat operating fluid is prevented from completely evaporating in the flow path in the heat exchanger 81, and the amount of the heat operating fluid returning to the compression unit 2 is reduced. The temperature is set to a steady value to reduce the overload of the compression unit 2.

[Description of Control Process Flow] The control process flow of FIG. 2 will be described below. This processing flow is configured as a subroutine attached to the main control processing flow for performing the control processing in the steady cooling operation and the heating operation for the entire heat source unit 10 and the indoor unit 80, and the cooling operation The control processing flow is arranged to shift to this control processing flow at predetermined time intervals, for example, every 5 seconds.

In step SP1, data of each required detection value is fetched, and the process proceeds to the next step SP2. In step SP2, it is determined whether or not the vehicle is in the overload state by the above [discrimination of the overload state]. If it is in the overload state, the process proceeds to the next step SP3, and if not, the process proceeds to step SP10.

At step SP3, the value obtained by causing the control unit 82 on the side of each indoor unit 80 to obtain the temperature difference (T2-T1) between the detected value T1 of the temperature detector D4 and the detected value T2 of the temperature detector D5 is By determining whether it is less than the second predetermined value TB, that is, less than 10 ° C., it is determined whether it is within the first reduction range. If it is less than the second predetermined value TB, the process proceeds to the next step SP4, and if not, that is, if the second predetermined value TB is reached, the process proceeds to step SP6.

In step SP4, as the first reduction, the opening degree of the flow rate adjusting valve V1 is reduced by one step, that is,
(-1 step), and set the air volume of blower F1 to 1
After the reduction by only one step, that is, (-1 step), the data indicating that the first reduction is performed is stored in the working memory 73 of the control unit 7, and the process returns to the predetermined step of the main control processing flow.

In step SP5, the temperature difference (T
2−T1) reaches the second predetermined value TB and reaches the value, that is, 10 ° C., thereby determining whether or not it is within the range of the second reduction. To do. Second
If it is the predetermined value TB of, the process proceeds to the next step SP4. If not, that is, if it is a value lower than the second predetermined value TB, the process proceeds to step SP7.

In step SP6, as the second reduction, the air volume of the blower F1 is reduced by one step, that is, (-
After one step), the data indicating that the second reduction has been performed is stored in the working memory 73 of the control unit 7, and the process returns to the predetermined step of the main control processing flow.

In step SP7, an alarm indicating "abnormal overload" is displayed on each display unit 75 attached to the control unit 7 / control unit 82, and a step for abnormally stopping the main control processing flow is performed. Move to.

◆ In step SP10, "load margin",
That is, the current load state of the compressor 2A is below the pressure limit point PL of [outside air temperature / compression discharge pressure characteristic] in FIG. 3, or [compression drive rotation speed / compression drive output in FIG. 3]. [Characteristic]] is below the limit value PSL. When there is a "load margin", the process proceeds to the next step SP11, and when not, that is, the pressure limit point P described above.
When it matches L or the limit value PSL, the process returns to a predetermined step of the main control processing flow.

In step SP11, step SP6
Then, it is determined whether or not the second reduction is performed.
When the second reduction is performed, the next step SP1
2, and otherwise moves to step SP14. This determination is made based on the data stored in the working memory 73 of the control unit 7 in step SP6.

In step SP12, it is determined whether or not the second predetermined reduction has been canceled last time, that is, the first predetermined time t1, for example, 3 minutes has elapsed since the cancellation in step SP13 described later. This determination is made by the second step SP13 described later, which is stored in the work memory 73 of the control unit 7.
The second reduction cancellation data must be stored, and the second
It is determined that the time data measured by the clock circuit 74 from the time when the next reduction is released has passed the first predetermined time t1.

In step SP13, as the secondary reduction cancellation, the air volume of the blower F1 is increased by one step, that is,
After (+1 step), the data indicating that the second reduction cancellation is performed is stored in the working memory 73 of the control unit 7,
It returns to the predetermined step of the main control processing flow.

◆ In step SP14, step SP4
Then, it is determined whether or not the first reduction is performed.
When the first reduction is being performed, the next step SP1
If not, the process returns to a predetermined step of the main control processing flow. This determination is made based on the data stored in the work memory 73 of the control unit 7 in step SP4.

In step SP12, it is determined whether or not a second predetermined time t2, for example, 10 minutes has elapsed since the last cancellation of the secondary reduction, that is, the cancellation in step SP13 described later. This determination is based on the fact that the data of the primary reduction cancellation in step SP16, which will be described later, stored in the working memory 73 of the control unit 7 is stored, and the time elapsed from the time of the primary reduction cancellation is calculated by the clock circuit. It is determined that the time data measured at 74 has passed the second predetermined time t2.

In step SP16, as the first reduction release, the opening degree of the flow rate adjusting valve V1 is increased by one step, that is, (+1 step), and the air volume of the blower F1 is increased by one step, that is, ( (+1 step), the data indicating that the first reduction cancellation is performed is sent to the control unit 7
Stored in the work memory 73, and returns to a predetermined step in the main control processing flow.

[Summary of Configuration of First Embodiment] To summarize the configuration of the first embodiment described above, the required heat-operated fluid pressurized in the compression section 2 is exchanged with the outside air, for example, the heat exchanger 5. A heat exchanger for performing heat exchange with the indoor air, for example, a heat exchanger 81 for condensing the condensate heat-treated fluid obtained by condensation by heat exchange with In the air-conditioning heat pump device 100, which performs the operation and when the compression unit 2 is overloaded, for example, determines the overload in step SP2 and performs the overload reduction operation to reduce the overload,

For example, in step SP4, the flow rate of the condensation heat operating fluid flowing through the heat exchanger 81 is reduced by reducing the flow rate of the flow rate adjusting valve V1, and the air volume of the blower F1 is adjusted to be reduced. A first configuration in which an overload reducing unit that performs the above-described overload reducing operation is provided in parallel with the reduction of the flow rate of the indoor air flowing through the heat exchanger 81.

In the air-conditioning heat pump device 100 having the same structure as the first structure, for example, the above-mentioned heat exchangers, that is, the above-mentioned heat operations on the inlet side and the outlet side of the heat exchanger 81 are carried out at step SP3 and step SP4. Fluid temperature difference,
For example, within a range in which the temperature difference (T1-T2) due to the detected values of the temperature detector D4 and the temperature detector D5 exceeds the first predetermined value (TA) and reaches the second predetermined value (TB), The flow rate of the condensation heat operating fluid flowing through the heat exchanger 81 is reduced by adjusting the flow rate of the regulating valve V1 and the flow rate of the blower F1 is reduced by adjusting the flow rate of the heat exchanger 81. First overload reducing means for performing the above-mentioned overload reducing operation in parallel with the above-mentioned reduction of the indoor air flow rate,

For example, step SP5 and step SP6
Thus, when the temperature difference (T1-T2) reaches the second predetermined value (TB), the above-mentioned flow of heat to the heat exchanger 81 by adjusting the air volume of the blower F1 is reduced. The second configuration includes the second overload reducing means that performs the above-described overload reducing operation only by reducing the flow rate of the indoor air.

[Second Embodiment] Next, a second embodiment will be described with reference to FIGS. In the second embodiment, a plurality of indoor units 80 in the first embodiment, for example, No. 1 unit, No. 2 unit,
It is an example of an air conditioning heat pump device 100 having a "plural indoor unit configuration" configured as a No. 3 unit, and is different from the first example in that overload reduction of the compression unit 2 and heat exchanger of each indoor unit 80 are different. Of the 81, the one with the lowest indoor temperature is preferentially selected to sequentially perform the first overload reduction and the second overload reduction, and when canceling the overload reduction, each indoor unit Of the heat exchangers 81 of 80, the one having the highest indoor temperature is preferentially selected, and the second overload reduction is canceled sequentially, and then the first overload reduction is canceled. In order to perform the control processing based on such determination, the processing memory 72 of the control unit 7 stores the program and the predetermined value data according to the control processing flow as shown in FIG.
Is remembered.

[Description of Control Process Flow] The control process flow of FIG. 5 will be described below. 5 is different from the control processing flow of FIG. 2 in the control processing flow for overload reduction on the left side of FIG. 5 where the indoor air temperature of the heat exchanger 81 of each indoor unit 80 is the lowest. A step SP2A for preferentially selecting a heat exchanger, and a step SP3A and a step SP5A for determining whether to perform the first reduction or the second reduction for the selected heat exchanger 81. It is a place.

Further, in the control processing flow for releasing the overload reduction on the right side of FIG. 5, step SP12A for preferentially selecting the one with the highest indoor temperature among the heat exchangers 81 of each indoor unit 80 This is the place of step SP15A.

Therefore, here, only the steps SP2A, step SP3A, step SP5A, step SP12A, and step SP15A will be described, and the description of the other steps will be omitted.

Incidentally, step SP2A and step SP3
A. The control processing by step SP6A is, for example, as shown in FIG.
The selection and control as described in [Minimum temperature indoor unit selection control procedure] are performed.

◆ In step SP2A, each heat exchanger 81
Among them, the one having the lowest temperature value TC of the indoor air detected by the temperature detector D6 is selected, and the process proceeds to step SP3A. Here, when there are plural temperature values TC that are the same, the one with the smaller temperature difference (T2-T1) is selected.

This selection procedure will be described with reference to FIG. 6. For example, in the first reduction step, the temperature value TC is 1
The second unit is selected in the second stage, the second unit is selected in the third stage, the first unit is selected in the nth stage, the second unit is selected in the n + 1th stage, and the second unit is selected in the n + 2nd stage.

In step SP3A, step SP2
For the heat exchanger 81 selected in A2, it is determined whether or not the primary reduction is to be performed. If the first reduction is to be performed, the process proceeds to the next step SP4, and if not, the process proceeds to step SP5A. Here, in the first reduction, the temperature difference (T2-T1) is the first predetermined value TA, for example, 1 ° C.
Since it is performed for the value exceeding the second predetermined value TB and less than 10 ° C, for example, it is determined whether or not there is a corresponding value.

The selection procedure will be described with reference to FIG. 6. For example, in the first unit in the first stage of the reduction stage, the temperature difference (T2-T
1) is 1.5 ° C and less than the second predetermined value TB, that is,
Since it is less than 10 ° C, it corresponds to the target of the first reduction, and similarly, the second stage No. 2 machine, the third stage No. 2 machine, n + 1
Unit 2 at the stage will be the target of the first reduction.

In step SP5A, step SP2
For the heat exchanger 81 selected in A2, it is determined whether or not the secondary reduction is to be performed. If the second reduction is to be performed, the process proceeds to the next step SP6, and if not, the process proceeds to step SP7. Here, in the second reduction, the temperature difference (T2-T1) is the second predetermined value TB, for example, 10 ° C.
Since it is performed for those that have reached, it will be determined whether or not there is a corresponding one.

The selection procedure will be described with reference to FIG. 6. For example, in the n-th stage No. 1 machine of the reduction stage, the temperature difference (T2-T
1) is 10 ° C, and a second predetermined value TB, for example, 10 °
Since it has reached C, it corresponds to the target of the second reduction, and similarly, the second vehicle in the (n + 2) th stage corresponds to the target of the second reduction.

In step SP12A, the temperature difference (T2
The heat exchanger 81 having the highest −T1) is selected, and the process proceeds to the next step SP13. ◆ In step SP15A,
The heat exchanger 81 having the highest temperature difference (T2-T1) is selected, and the process proceeds to the next step SP16.

[Summary of Configuration of Second Embodiment] To summarize the configuration of the second embodiment, the required heat-operated fluid pressurized in the compression section 2 is exchanged with the outside air, for example, the heat exchanger 5. The condensed operating fluid obtained by condensing by the heat exchange by means of is given to a plurality of heat exchangers that exchange heat with the indoor air, for example, a plurality of heat exchangers 81 to cool the indoor air. A heat pump device for air conditioning that performs a cooling operation for reducing the overload and reduces the overload when the compression unit 2 is overloaded, for example, by determining the overload in step SP2. At 100,

For example, in step SP2A, the heat exchanger 81 having the lowest temperature of the indoor air, for example, the temperature value TC detected by the temperature detector D6 among the plurality of heat exchangers 81 is selected. Select preferentially and sequentially,
Low temperature priority overload reducing means for performing the above-mentioned overload reducing operation,

For example, in step SP3A, the temperature difference between the heat operation fluids on the inlet side and the outlet side of the heat exchanger 81 selected by the above selection, for example, detection by the temperature detector D4 and the temperature detector D5. Temperature difference due to value (T1-T
2) exceeds the first predetermined value (TA) and the second predetermined value (T)
Within the range until reaching B), the flow rate of the condensation heat operating fluid flowing through the heat exchanger 81 is reduced by adjusting the flow rate of the flow rate adjusting valve V1, and the air volume of the blower F1 is adjusted to be reduced. The first overload reducing operation, that is, the first reducing operation is performed in parallel with the reduction of the flow rate of the indoor air flowing through the heat exchanger 81.
Overload reducing means,

For example, in step SP5A, the temperature difference (T) of the heat exchanger 81 selected by the above selection is
2-T1) has reached the second predetermined value (TB), only the flow rate of the indoor air flowing through the heat exchanger 81 is reduced by adjusting the air volume of the blower F1. And a second configuration for providing a second overload reducing operation, that is, a second overload reducing means for performing the second reducing operation,

In addition to the third configuration, when canceling the above reduction, for example, step SP11 / step SP
12A-Step SP13 preferentially selects the above-mentioned heat exchanger 81 in which the temperature of the indoor air is highest among the above-mentioned plurality of units and which is performing the above-mentioned second reduction operation, and sequentially After canceling the second reducing operation, the heat exchanger having the highest indoor air temperature among the plurality of units and performing the first reducing operation in step SP14, step SP15A, and step SP16. In other words, the fourth configuration is provided in which the load reduction canceling means for canceling the first reduction operation is sequentially provided with priority to 81.

[Modification Implementation] The present invention includes the following modifications and implementations. (1) It is configured by being applied to an air conditioning heat pump device configured to perform only a cooling operation.

[0086]

According to the present invention, even when the temperature of the outside air flowing through the heat exchanger on the heat source unit side is high and the operating condition is such that the compressor is easily overloaded during the cooling operation, the heat on the indoor unit side is reduced. The temperature difference of the heat operating fluid flowing through the exchanger is expanded to a predetermined value that is larger than the steady state, and the flow rate of the heat operating fluid flowing through the heat exchanger and the flow rate of the indoor air are reduced in parallel. After reducing the load and further reaching the above-mentioned predetermined value, only the flow rate of the indoor air flowing through the heat exchanger is reduced to reduce the overload of the compression unit, so that it is wide. Appropriate overload reduction can be performed for overload conditions over a range.

Further, since the reduction of the flow rate of the heat operation fluid flowing through the heat exchanger and the reduction of the flow rate of the room air are performed in parallel, the evaporation of the heat operation fluid is uniform from the inlet to the outlet of the heat exchanger. Since it is performed on average, there is a feature that it is possible to provide an air conditioning heat pump device in which the dew condensation in the latter half portion near the outlet side of the heat exchanger that occurs when overloaded is eliminated.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention, and FIG.
-Fig. 8 shows a conventional technique, and the contents of each diagram are as follows.

FIG. 1 is an overall block configuration diagram.

FIG. 2 is a flowchart of a main part control processing.

FIG. 3 is a control characteristic diagram of main parts.

FIG. 4 is an overall block configuration diagram.

FIG. 5 is a flow chart of main part control processing.

FIG. 6 is a control processing selection diagram.

FIG. 7 is an overall block configuration diagram.

FIG. 8 is a block diagram of a main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drive source 2 Compressor 2A Compressor 2B Accumulator 3 Flow path switching part 4 Flow rate adjusting part 4A Storage tank 5 Heat exchanger 5C Blocking plate 6 Setting operation part 7 Control part 10 Heat source device 70 CPU / B 71 Input / output port 72 Processing Memory 73 Working memory 74 Clock circuit 75 Display unit 76 Communication connection terminal 77 Communication path 80 Indoor unit 81 Heat exchanger 82 Control unit 83 Setting operation unit 100 Air conditioning heat pump device D1 Temperature detector D2 Temperature detector D3 Temperature detector D4 Temperature Detector D5 Temperature detector D6 Temperature detector D7 Pressure detector D8 Temperature detector D9 Pressure detector D10 Temperature detector F1 Blower F2 Blower V1 Flow rate control valve V2 Flow rate control valve V3 Check valve

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area F25B 13/00 F25B 13/00 K 104 104 104

Claims (4)

[Claims] 1. A condensed heat-operated fluid obtained by condensing a required heat-operated fluid pressurized in a compression section by heat exchange with outside air is supplied to a heat exchanger for heat exchange with indoor air to be evaporated. A heat pump device for air conditioning, which performs a cooling operation for cooling the indoor air by performing an overload reduction operation for reducing the overload when the compression unit is overloaded. An overload reducing unit that performs the overload reducing operation in parallel with reducing the flow rate of the condensate heat operating fluid flowing through the heat exchanger and reducing the flow rate of the indoor air flowing through the heat exchanger. Characteristic heat pump device for air conditioning. 2. A condensed heat-operated fluid obtained by condensing a required heat-operated fluid pressurized in a compression section by heat exchange with outside air is supplied to a heat exchanger for heat exchange with indoor air to evaporate. A heat pump device for air conditioning, which performs a cooling operation for cooling the indoor air by performing an overload reduction operation for reducing the overload when the compression section is overloaded, by the heat exchanger of the heat exchanger. The flow rate of the condensed heat-operated fluid flowing through the heat exchanger is reduced within a range in which the temperature difference between the inlet-side and outlet-side heat-operated fluids exceeds a first predetermined value and reaches a second predetermined value. And a first overload reducing unit that performs the overload reducing operation in parallel with reducing the flow rate of the indoor air flowing through the heat exchanger, and the temperature difference reaches the second predetermined value. When the flow of the indoor air flowing through the heat exchanger Air-conditioning heat pump apparatus characterized by comprising a second overload reducing means for performing the overload reduction operation by a reduction only. 3. A condensed heat-operated fluid obtained by condensing a required heat-operated fluid pressurized in a compression section by heat exchange with outside air is supplied to a plurality of heat exchangers for heat exchange with indoor air. A heat pump device for air conditioning, which performs a cooling operation for cooling the indoor air by evaporating the air and also performs an overload reducing operation for reducing the overload when the compression section is overloaded, Of the base heat exchangers, the heat exchanger having the lowest temperature of the indoor air is preferentially selected and sequentially, low temperature priority overload reducing means for performing the overload reducing operation, and selected by the selection. Within the range in which the temperature difference between the heat operating fluid on the inlet side and the outlet side of the heat exchanger exceeds a first predetermined value and reaches a second predetermined value, the condensation heat operation flowing through the heat exchanger. Reduce the flow rate of the fluid and First in parallel and reducing the flow rate of the room air
And a first overload reducing unit that performs the overload reducing operation, and when the temperature difference between the heat exchangers selected by the selection has reached the second predetermined value, the heat exchanger that flows into the heat exchanger An air-conditioning heat pump device comprising: a second overload reducing unit that performs a second overload reducing operation only by reducing a flow rate of indoor air. 4. A condensed heat-operated fluid obtained by condensing a required heat-operated fluid pressurized in a compression section by heat exchange with outside air is provided to a plurality of heat exchangers for heat exchange with indoor air. A heat pump device for air conditioning, which performs a cooling operation for cooling the indoor air by evaporating the air and also performs an overload reducing operation for reducing the overload when the compression section is overloaded, Among the heat exchangers of the base, the heat exchanger with the lowest temperature of the indoor air is preferentially selected and sequentially, low-temperature priority overload reducing means for performing the overload reducing operation, and the selection selected by the selection. Within the range in which the temperature difference between the inlet side and the outlet side of the heat exchanger fluid exceeds a first predetermined value and reaches a second predetermined value, the condensed heat operating fluid flowing through the heat exchanger. Flow rate of the The parallel and reduction of the flow rate of the room air 1
A first overload reducing means for performing the overload reducing operation (hereinafter, referred to as a first reducing operation), and when the temperature difference between the heat exchangers selected by the selection has reached the second predetermined value. A second overload reducing operation (hereinafter referred to as a second reducing operation) only by reducing the flow rate of the indoor air flowing through the heat exchanger,
Overload reducing means, and when canceling the reduction, preferentially select the heat exchanger in which the temperature of the indoor air is highest among the plurality of groups and performing the second reducing operation, and sequentially. , After the second reducing operation is released, the heat exchanger having the highest indoor air temperature among the plurality of units and performing the first reducing operation is preferentially and sequentially given the first reducing operation. A heat pump device for air conditioning, comprising: