JP2004176654A - Compression device, and air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that uncooled air is blown into a room when blower delay control is executed to operate a blower at a prescribed time after starting a variable displacement compressor because delivery displacement is not sufficiently increased, which means that an air conditioner is not substantially started. <P>SOLUTION: When delivery pressure Pd becomes a prescribed value or more, it is taken that the delivery displacement of the compressor 1 reaches a prescribed capacity or more, that is the maximum capacity, and blower delay control is started. Blowing of uncooled air into the room can thus be securely prevented. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a compression device having a variable displacement compressor, and is effective when applied to a vehicle air conditioner.
[0002]
[Prior art]
Immediately after starting the air conditioner, that is, immediately after starting the compressor, the temperature of the indoor heat exchanger is not sufficiently reduced. Air may be blown into the room.
[0003]
Therefore, in a conventional vehicle air conditioner, after a predetermined time has elapsed from when the compressor is started, that is, when power is transmitted to the compressor by energizing the electromagnetic clutch, the blower is operated to blow air into the room. (For example, see Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent Publication No. 5-9285 [0005]
[Problems to be solved by the invention]
Incidentally, the invention described in Patent Document 1 relates to an air conditioner using a fixed displacement compressor in which the discharge capacity does not change. The invention described in Patent Document 1 relates to a variable displacement capable of changing the discharge capacity. When applied to an air conditioner using a type compressor, the following problems occur.
[0006]
Note that the discharge capacity refers to a geometric theoretical discharge amount discharged when the shaft makes one rotation.
[0007]
That is, in a variable displacement type swash plate type compressor (see FIG. 2), such as a swash plate type variable displacement compressor, which changes the stroke of a piston (see FIG. 2), the pressure in the swash plate chamber 1b is controlled so that the swash plate chamber 1b is controlled. The pressure in 1b changes the balance between the force acting on the piston 1c and the compression reaction force acting on the piston 1c, thereby changing the tilting moment for tilting the swash plate 1a and changing the stroke of the piston 1c to discharge. Change the capacity.
[0008]
Normally, the swash plate chamber 1b is always in communication with the suction side through a throttle means such as an orifice, and is in communication with the discharge side through a control valve capable of changing the throttle opening. The pressure in the swash plate chamber 1b is controlled by controlling the opening of the control valve.
[0009]
Normally, when the discharge capacity is maximized, the control valve is closed to reduce the pressure in the swash plate chamber 1b to substantially the suction pressure. On the other hand, when the discharge capacity is reduced, the control valve is opened and the pressure in the swash plate chamber 1b is reduced. Increase pressure. Therefore, when the discharge capacity is reduced, most of the discharged refrigerant flows into the swash plate chamber 1b.
[0010]
At this time, if the compressor is started with a large amount of liquid refrigerant accumulated in the swash plate chamber 1b, the swash plate 1a tilts in the liquid refrigerant in addition to the small differential pressure between the suction pressure and the discharge pressure. Therefore, the swash plate 1a cannot be quickly tilted due to the resistance of the liquid refrigerant, and the discharge capacity cannot be quickly increased.
[0011]
Therefore, even when the blower is operated after a predetermined time has elapsed from when the compressor is started, that is, when a signal to increase the discharge capacity is issued to the control valve, the discharge capacity is sufficiently increased. However, since the air conditioner has not been substantially activated, there is a problem that uncooled air is blown into the room.
[0012]
The present invention has been made in view of the above points, and has as its first object to provide a new air conditioner different from the conventional one, and second, to provide means capable of solving the above problem.
[0013]
[Means for Solving the Problems]
To achieve the above object, according to the first aspect of the present invention, a control pressure chamber (1b) is controlled by controlling a pressure in a control pressure chamber (1b) communicating with a discharge side and a suction side. A variable displacement compressor (1) for changing the state of balance between the force acting on the piston (1c) from the side and the compression reaction force acting on the piston (1c) to change the displacement, and a control pressure chamber (1b). ), A discharge side, and a control valve (6) for controlling a communication state of at least one of the control pressure chamber (1b) and the suction side; and a pressure detecting means (7d) for detecting a discharge pressure of the compressor (1). A signal output means for, when the pressure detected by the pressure detecting means (7d) becomes equal to or more than a predetermined value, deeming that the discharge capacity of the compressor (1) has become equal to or more than the predetermined capacity and outputting a signal to that effect; And characterized in that:
[0014]
Thus, if the present invention is applied to an air conditioner, it is possible to reliably prevent uncooled air from being blown into a room.
[0015]
According to the second aspect of the present invention, by controlling the pressure in the control pressure chamber (1b) communicating with the discharge side and the suction side, the force acting on the piston (1c) from the control pressure chamber (1b) side and the piston A variable displacement compressor (1) for changing the state of balance with the compression reaction force acting on (1c) to change the displacement, a control pressure chamber (1b), a discharge side, and a control pressure chamber (1b). A control valve (6) for controlling the communication state of at least one of the compressor and the suction side, a pressure detecting means (7d) for detecting a discharge pressure of the compressor (1), and increasing a discharge capacity of the compressor (1). As described above, when the increasing width of the detected pressure of the pressure detecting means (7d) becomes equal to or more than a predetermined value based on the detected pressure of the pressure detecting means (7d) when the control valve (6) is operated, the compressor ( Assuming that the discharge capacity of 1) has exceeded the predetermined capacity, Characterized in that it comprises a signal output means for outputting a signal.
[0016]
Thus, if the present invention is applied to an air conditioner, it is possible to reliably prevent uncooled air from being blown into a room.
[0017]
According to the third aspect of the invention, by controlling the pressure in the control pressure chamber (1b) communicating with the discharge side and the suction side, the force acting on the piston (1c) from the control pressure chamber (1b) side and the piston A variable displacement compressor (1) for changing the state of balance with the compression reaction force acting on (1c) to change the displacement, a control pressure chamber (1b), a discharge side, and a control pressure chamber (1b). A control valve (6) for controlling at least one communication state between the compressor and the suction side, a discharge pressure detecting means (7d) for detecting a discharge pressure of the compressor (1), and detecting a suction pressure of the compressor (1) And a compressor (1) which detects when the pressure difference between the detected pressure of the discharge pressure detecting means (7d) and the detected pressure of the suction pressure detecting means (7d) becomes equal to or greater than a predetermined value. Is determined to be equal to or greater than the predetermined volume, and a signal to that effect is given. Characterized in that it comprises a signal output means for outputting.
[0018]
Thus, if the present invention is applied to an air conditioner, it is possible to reliably prevent uncooled air from being blown into a room.
[0019]
According to the fourth aspect of the present invention, by controlling the pressure in the control pressure chamber (1b) communicating with the discharge side and the suction side, the force acting on the piston (1c) from the control pressure chamber (1b) side and the piston A variable displacement compressor (1) for changing the state of balance with the compression reaction force acting on (1c) to change the displacement, a control pressure chamber (1b), a discharge side, and a control pressure chamber (1b). A control valve (6) for controlling a communication state of at least one of the compressor and the suction side, a temperature detecting means (7d) for detecting a temperature of refrigerant discharged from the compressor (1), and a detected temperature of the temperature detecting means (7d). And a signal output means for outputting a signal to the effect that the discharge capacity of the compressor (1) is equal to or greater than the predetermined capacity when the pressure is equal to or more than a predetermined value.
[0020]
Thus, if the present invention is applied to an air conditioner, it is possible to reliably prevent uncooled air from being blown into a room.
[0021]
According to the fifth aspect of the present invention, by controlling the pressure in the control pressure chamber (1b) communicating with the discharge side and the suction side, the force acting on the piston (1c) from the control pressure chamber (1b) side and the piston A variable displacement compressor (1) for changing the state of balance with the compression reaction force acting on (1c) to change the displacement, a control pressure chamber (1b), a discharge side, and a control pressure chamber (1b). A control valve (6) for controlling at least one communication state between the compressor and the suction side, a temperature detecting means (7d) for detecting a refrigerant temperature discharged from the compressor (1), and increasing a discharge capacity of the compressor (1). When the increase in the temperature detected by the temperature detecting means (7d) is equal to or greater than a predetermined value based on the temperature detected by the temperature detecting means (7d) when the control valve (6) is operated, the compressor is operated. Assuming that the discharge capacity of (1) has exceeded a predetermined capacity, Characterized in that it comprises a and a signal output means for outputting a signal indicating that.
[0022]
Thus, if the present invention is applied to an air conditioner, it is possible to reliably prevent uncooled air from being blown into a room.
[0023]
According to the sixth aspect of the present invention, by controlling the pressure in the control pressure chamber (1b) communicating with the discharge side and the suction side, the force acting on the piston (1c) from the control pressure chamber (1b) side and the piston A variable displacement compressor (1) for changing the state of balance with the compression reaction force acting on (1c) to change the displacement, a control pressure chamber (1b), a discharge side, and a control pressure chamber (1b). A control valve (6) for controlling a communication state of at least one of the compressor and the suction side, a discharge refrigerant temperature detecting means (7d) for detecting a temperature of a discharge refrigerant of the compressor (1), and a suction of the compressor (1) The temperature difference between the detected temperature of the suction refrigerant temperature detection means (7d) and the temperature detected by the suction refrigerant temperature detection means (7d) is equal to or greater than a predetermined value. The discharge capacity of the compressor (1) exceeds a predetermined capacity Since it is assumed, characterized in that it comprises a signal output means for outputting a signal to that effect.
[0024]
Thus, if the present invention is applied to an air conditioner, it is possible to reliably prevent uncooled air from being blown into a room.
[0025]
According to a seventh aspect of the present invention, a vapor compression refrigerator that sucks and compresses a refrigerant in the compression device according to any one of the first to sixth aspects, and blows air that exchanges heat with the refrigerant and blows out into the room. And a blower start control means for operating the blower (12) when a signal is issued by the signal output means.
[0026]
Thus, it is possible to reliably prevent uncooled air from being blown into the room.
[0027]
Incidentally, reference numerals in parentheses of the above-mentioned units are examples showing the correspondence with specific units described in the embodiments described later.
[0028]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
In this embodiment, the compression device according to the present invention is applied to an air conditioner for a vehicle, and FIG. 1 is a schematic diagram of the air conditioner for a vehicle.
[0029]
The vapor compression refrigerator, which is a main component of the vehicle air conditioner, exchanges heat between the high-temperature and high-pressure refrigerant compressed by the compressor 1 and the outside air to cool the refrigerant, and flows out of the radiator 2. 3 that separates the obtained refrigerant into a liquid-phase refrigerant and a gas-phase refrigerant and stores excess refrigerant as a liquid-phase refrigerant, a decompressor 4 that depressurizes the liquid-phase refrigerant supplied from the receiver 3, and a depressurized low-pressure / low-temperature The evaporator 5 and the like constitute an indoor heat exchanger that exchanges heat between the refrigerant and air blown into the room to evaporate the liquid-phase refrigerant.
[0030]
The compressor 1 operates by receiving power from an internal combustion engine serving as a driving source for traveling, that is, an engine 8, and is mechanically linked to start / stop of the engine 1 via a V-belt and a pulley 9. And work.
[0031]
The heater 10 heats the air blown into the room using the cooling water of the engine 8 as a heat source. The heating capacity of the heater 10 is controlled by adjusting the flow rate of the hot water supplied to the heater 10 by the flow control valve 11. The blower 12 blows the air blown into the room.
[0032]
Incidentally, in the present embodiment, a so-called reheat method is adopted in which the air that has passed through the evaporator 5 is heated, and the amount of the heated air is adjusted to adjust the temperature of the air blown into the room. The present invention is not limited to this, and a so-called air-mix type in which the temperature of air blown into the room is adjusted by adjusting the amount of warm air passing through the heater 10 and the amount of cool air bypassing the heater 10 may be adopted. Needless to say, it's good.
[0033]
FIG. 2 is a cross-sectional view of a variable capacity swash plate type compressor 1 which, as is well known, controls the pressure in a swash plate chamber (crankcase) 1b which forms a control pressure chamber. This compressor is capable of changing the displacement angle by changing the inclination angle of the plate 1a, that is, the stroke of the piston 1c.
[0034]
More specifically, the suction side of the compressor 1 and the swash plate chamber 1b are always in communication with each other through a throttle (not shown) that generates a predetermined pressure loss such as an orifice or a capillary tube. A pressure control valve 6 is provided for controlling the communication state of a pressure introduction passage (not shown) for communicating the pressure side with the swash plate chamber 1b. To increase the discharge capacity, the pressure introduction passage is narrowed or closed by narrowing or closing the pressure introduction passage. When reducing the pressure in the plate chamber 1b and reducing the discharge capacity, the pressure control valve 6 is opened to increase the pressure in the swash plate chamber 1b.
[0035]
Therefore, when the discharge capacity is at the maximum, the pressure in the swash plate chamber 1b is substantially equal to the suction pressure. On the other hand, when the discharge capacity is the minimum, the pressure in the swash plate chamber 1b is substantially equal to the discharge pressure.
[0036]
As shown in FIG. 1, the pressure control valve 6 is controlled by an electronic control unit (ECU) 7. During normal operation, the ECU 7 controls the pressure (evaporation temperature) in the evaporator 5 to a predetermined value. The duty control of the pressure control valve 6 is performed so that the value becomes a value.
[0037]
Since it is difficult to directly measure the evaporating temperature, in this embodiment, the pressure control valve 6 is controlled based on the air temperature immediately after passing through the evaporator 5, specifically, the temperature detected by the temperature sensor 7a. Controlling.
[0038]
Incidentally, in addition to the temperature sensor 7a, the ECU 7 detects signals of the air conditioning sensors 7b such as an outside air temperature sensor, an inside air temperature sensor, and a solar radiation sensor, the set values of the operation panel 7c operated and set by the occupant, and the discharge of the compressor 1. A discharge pressure sensor for detecting the pressure, a discharge refrigerant temperature sensor for detecting the discharge refrigerant temperature of the compressor 1, a suction pressure sensor for detecting the suction pressure of the compressor 1, and a suction refrigerant temperature sensor for detecting the suction refrigerant temperature of the compressor 1. And the like, the detection value of the compressor control parameter detection sensor 7d is input.
[0039]
Next, the characteristic operation of the present embodiment will be described based on the flowchart shown in FIG.
[0040]
This control flow is executed during the cooling operation. When the start switch (A / C switch) of the air conditioner or the blower switch for starting the blower 12 is turned on, the discharge pressure Pd of the compressor 1 is detected (monitored). ) (S11), and when the discharge pressure Pd becomes equal to or higher than a predetermined pressure P1 (for example, about 0.7 MPa at an outside air temperature of 20 ° C. or +0.1 MPa at a saturation pressure), the blower delay control is started. (S12, S13).
[0041]
Here, the blower delay control is a control for delaying the start of the blower 12 by a predetermined time T1 in order to prevent uncooled air from being blown into the room, and the discharge pressure Pd is reduced to a predetermined pressure P1. The measurement of the predetermined time T1 is started based on the above.
[0042]
When the A / C switch or the blower switch is shut off, it means that the air conditioner is stopped. Therefore, normally, when the A / C switch or the blower switch is turned on, the pressure control from the ECU 7 is performed. A signal to increase the discharge capacity to the maximum capacity is issued to the valve 6, and the pressure control valve 6 is operated so that the discharge capacity becomes the maximum capacity.
[0043]
Then, when the measured time is equal to or longer than the predetermined time T1, the blower 12 is started to start blowing air into the room (S14, S15). When the measurement time is shorter than the predetermined time T1, the blower 12 is not operated (S16).
[0044]
Next, the operation and effect of the present embodiment will be described.
[0045]
In the present embodiment, when the discharge pressure Pd becomes equal to or more than a predetermined value, it is considered that the discharge capacity of the compressor 1 is equal to or more than a predetermined capacity, that is, the maximum capacity, and the blower delay control is started. It is possible to reliably prevent the air that has not been blown into the room.
[0046]
(2nd Embodiment)
In the first embodiment, the blower delay control is started when the discharge pressure Pd becomes equal to or higher than a predetermined value. However, in the present embodiment, the discharge capacity of the compressor 1 is increased as shown in FIG. When the pressure control valve 6 is actuated, that is, when the ECU 7 sends a signal to the pressure control valve 6 to increase the discharge capacity to the maximum capacity, the rise width ΔP of the discharge pressure Pd is a predetermined value based on the discharge pressure Pd. When ΔP1 (for example, about 0.1 MPa when the outside air temperature is 20 ° C.) or more, the blower delay control is started.
[0047]
Thus, also in the present embodiment, it is possible to reliably prevent uncooled air from being blown into the room.
[0048]
In addition, in the flowchart shown in FIG. 4, except for S22, it is the same as the first embodiment.
[0049]
(Third embodiment)
In the second embodiment, when the increase width ΔP of the discharge pressure Pd is equal to or more than a predetermined value ΔP1 based on the discharge pressure Pd when the pressure control valve 6 is operated so as to increase the discharge capacity of the compressor 1, Although the blower delay control is started, in the present embodiment, as shown in FIG. 5, the differential pressure ΔPs between the suction pressure Ps and the discharge pressure Pd of the compressor 1 is equal to or more than a predetermined value ΔPs1 (for example, 0.15 MPa). When this happens, the blower delay control is started.
[0050]
Thus, also in the present embodiment, it is possible to reliably prevent uncooled air from being blown into the room.
[0051]
Note that, in the flowchart shown in FIG. 5, the steps other than S32 are the same as those in the first embodiment.
[0052]
(Fourth embodiment)
Since the discharge pressure Pd and the discharge refrigerant temperature Td of the compressor 1 have a correlation, in the present embodiment, the blower delay control is performed using the discharge refrigerant temperature Td as a parameter. Hereinafter, the characteristic control of the present embodiment will be described with reference to FIG.
[0053]
At the same time when the A / C switch or the blower switch is turned on, the discharge refrigerant temperature Td of the compressor 1 starts to be detected (monitored) (S41), and when the discharge refrigerant temperature Td is a predetermined temperature Td1 (for example, when the outside air temperature is 20 ° C.) The blower delay control is started on the basis of when the temperature is about 30 ° C. or higher (S42, S43).
[0054]
Then, when the measurement time becomes equal to or longer than the predetermined time T1, the blower 12 is started to start blowing air into the room (S44, S45). When the measurement time is less than the predetermined time T1, the blower 12 is not operated (S46).
[0055]
Next, the operation and effect of the present embodiment will be described.
[0056]
In the present embodiment, when the discharge refrigerant temperature Td becomes equal to or higher than a predetermined value, it is considered that the discharge capacity of the compressor 1 is equal to or higher than the predetermined capacity, that is, the maximum capacity, and the blower delay control is started. It is possible to reliably prevent uncooled air from being blown into the room.
[0057]
(Fifth embodiment)
In the fourth embodiment, the blower delay control is started when the discharge refrigerant temperature Td becomes equal to or higher than a predetermined value. However, in the present embodiment, as shown in FIG. 7, the discharge capacity of the compressor 1 is increased. When the pressure control valve 6 is activated, that is, when the ECU 7 issues a signal to the pressure control valve 6 to increase the discharge capacity to the maximum capacity, the rise width ΔT of the discharge refrigerant temperature Td based on the discharge refrigerant temperature Td at the time of reference. Is greater than or equal to a predetermined value ΔT1 (for example, about 10 ° C. when the outside air temperature is 20 ° C.), the blower delay control is started.
[0058]
Thus, also in the present embodiment, it is possible to reliably prevent uncooled air from being blown into the room.
[0059]
Note that, in the flowchart shown in FIG. 7, except for S52, is the same as the fourth embodiment.
[0060]
(Sixth embodiment)
In the fifth embodiment, the increase width ΔT of the discharge refrigerant temperature Td is equal to or more than a predetermined value ΔP1 based on the discharge refrigerant temperature Td when the pressure control valve 6 is operated so as to increase the discharge capacity of the compressor 1. At this time, the blower delay control is started, but in the present embodiment, as shown in FIG. 8, the differential pressure ΔTs between the suction refrigerant temperature Ts and the discharge refrigerant temperature Td of the compressor 1 becomes a predetermined value ΔTs1 (for example, the outside air temperature). When the temperature is equal to or higher than about 15 ° C. at 20 ° C.), the blower delay control is started.
[0061]
Thus, also in the present embodiment, it is possible to reliably prevent uncooled air from being blown into the room.
[0062]
Note that, in the flowchart shown in FIG. 8, except for S62, is the same as the fourth embodiment.
[0063]
(Other embodiments)
In the above-described embodiment, the control device that controls the blower 12 and the control device that controls the compressor 1 are integrated. However, the present invention is not limited to this. The compressor device is separated from the air conditioning control device that controls the blower 12 and the like, and a signal indicating that the discharge capacity of the compressor 1 has exceeded a predetermined capacity is transmitted from the compressor device to the air conditioning control device, and the signal is received. May start the blower delay control.
[0064]
In the above-described embodiment, the ECU 7 corresponds to a “signal output unit” described in the claims.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a vehicle air conditioner (vapor compression refrigerator) according to an embodiment of the present invention.
FIG. 2 is a sectional view of a variable displacement type swash plate type compressor according to the embodiment of the present invention.
FIG. 3 is a flowchart illustrating control of the compression device according to the first embodiment of the present invention.
FIG. 4 is a flowchart illustrating control of a compression device according to a second embodiment of the present invention.
FIG. 5 is a flowchart illustrating control of a compression device according to a third embodiment of the present invention.
FIG. 6 is a flowchart illustrating control of a compression device according to a fourth embodiment of the present invention.
FIG. 7 is a flowchart illustrating control of a compression device according to a fifth embodiment of the present invention.
FIG. 8 is a flowchart illustrating control of a compression device according to a sixth embodiment of the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 compressor, 2 radiator, 3 receiver, 4 decompressor, 5 evaporator,
6 ... pressure control valve, 7 ... electronic control device.

Claims (7)

By controlling the pressure in the control pressure chamber (1b) communicating with the discharge side and the suction side, the force acting on the piston (1c) from the control pressure chamber (1b) side and the compression acting on the piston (1c). A variable displacement compressor (1) for changing the state of balance with the reaction force to change the discharge capacity;
A control valve (6) for controlling a communication state of at least one of the control pressure chamber (1b) and the discharge side, and at least one of the control pressure chamber (1b) and the suction side;
Pressure detection means (7d) for detecting a discharge pressure of the compressor (1);
When the pressure detected by the pressure detecting means (7d) becomes equal to or more than a predetermined value, it is considered that the discharge capacity of the compressor (1) has become equal to or more than a predetermined capacity, and a signal indicating that is output. Means. By controlling the pressure in the control pressure chamber (1b) communicating with the discharge side and the suction side, the force acting on the piston (1c) from the control pressure chamber (1b) side and the compression acting on the piston (1c). A variable displacement compressor (1) for changing the state of balance with the reaction force to change the discharge capacity;
A control valve (6) for controlling a communication state of at least one of the control pressure chamber (1b) and the discharge side, and at least one of the control pressure chamber (1b) and the suction side;
Pressure detection means (7d) for detecting a discharge pressure of the compressor (1);
Based on the pressure detected by the pressure detecting means (7d) when the control valve (6) is operated to increase the discharge capacity of the compressor (1), the pressure detected by the pressure detecting means (7d) is And a signal output means for outputting a signal indicating that the discharge capacity of the compressor (1) has become equal to or greater than a predetermined capacity when the increase width is equal to or more than a predetermined value. Compressor equipment. By controlling the pressure in the control pressure chamber (1b) communicating with the discharge side and the suction side, the force acting on the piston (1c) from the control pressure chamber (1b) side and the compression acting on the piston (1c). A variable displacement compressor (1) for changing the state of balance with the reaction force to change the discharge capacity;
A control valve (6) for controlling a communication state of at least one of the control pressure chamber (1b) and the discharge side, and at least one of the control pressure chamber (1b) and the suction side;
Discharge pressure detecting means (7d) for detecting a discharge pressure of the compressor (1);
Suction pressure detecting means (7d) for detecting a suction pressure of the compressor (1);
When the pressure difference between the detected pressure of the discharge pressure detecting means (7d) and the detected pressure of the suction pressure detecting means (7d) becomes equal to or more than a predetermined value, the discharge capacity of the compressor (1) becomes equal to or more than a predetermined capacity. And a signal output means for outputting a signal to that effect. By controlling the pressure in the control pressure chamber (1b) communicating with the discharge side and the suction side, the force acting on the piston (1c) from the control pressure chamber (1b) side and the compression acting on the piston (1c). A variable displacement compressor (1) for changing the state of balance with the reaction force to change the discharge capacity;
A control valve (6) for controlling a communication state of at least one of the control pressure chamber (1b) and the discharge side, and at least one of the control pressure chamber (1b) and the suction side;
Temperature detection means (7d) for detecting the temperature of the refrigerant discharged from the compressor (1);
When the temperature detected by the temperature detecting means (7d) becomes equal to or higher than a predetermined value, it is considered that the discharge capacity of the compressor (1) has become equal to or higher than a predetermined capacity, and a signal indicating that is output. Means. By controlling the pressure in the control pressure chamber (1b) communicating with the discharge side and the suction side, the force acting on the piston (1c) from the control pressure chamber (1b) side and the compression acting on the piston (1c). A variable displacement compressor (1) for changing the state of balance with the reaction force to change the discharge capacity;
A control valve (6) for controlling a communication state of at least one of the control pressure chamber (1b) and the discharge side, and at least one of the control pressure chamber (1b) and the suction side;
Temperature detection means (7d) for detecting the temperature of refrigerant discharged from the compressor (1);
Based on the temperature detected by the temperature detecting means (7d) when the control valve (6) is operated so as to increase the discharge capacity of the compressor (1), the temperature detected by the temperature detecting means (7d) is determined. And a signal output means for outputting a signal indicating that the discharge capacity of the compressor (1) has become equal to or greater than a predetermined capacity when the increase width is equal to or more than a predetermined value. Compressor equipment. By controlling the pressure in the control pressure chamber (1b) communicating with the discharge side and the suction side, the force acting on the piston (1c) from the control pressure chamber (1b) side and the compression acting on the piston (1c). A variable displacement compressor (1) for changing the state of balance with the reaction force to change the discharge capacity;
A control valve (6) for controlling a communication state of at least one of the control pressure chamber (1b) and the discharge side, and at least one of the control pressure chamber (1b) and the suction side;
Discharge refrigerant temperature detection means (7d) for detecting the temperature of the refrigerant discharged from the compressor (1);
A suction refrigerant temperature / pressure detecting means (7d) for detecting a temperature of the suction refrigerant of the compressor (1);
When the temperature difference between the temperature detected by the discharge refrigerant temperature detecting means (7d) and the temperature detected by the suction refrigerant temperature detecting means (7d) becomes equal to or more than a predetermined value, the discharge capacity of the compressor (1) becomes predetermined. A compressor that includes a signal output unit that outputs a signal indicating that the capacity is exceeded. A vapor compression refrigerator that sucks and compresses a refrigerant by the compression device according to any one of claims 1 to 6,
A blower (12) for exchanging heat with the refrigerant and blowing air blown into the room;
An air conditioner comprising: blower start control means for operating the blower (12) when the signal is issued by the signal output means.

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