WO2016194185A1 - Dispositif de cycle de réfrigération - Google Patents

Dispositif de cycle de réfrigération Download PDF

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Publication number
WO2016194185A1
WO2016194185A1 PCT/JP2015/066088 JP2015066088W WO2016194185A1 WO 2016194185 A1 WO2016194185 A1 WO 2016194185A1 JP 2015066088 W JP2015066088 W JP 2015066088W WO 2016194185 A1 WO2016194185 A1 WO 2016194185A1
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Prior art keywords
expansion device
refrigeration cycle
superheat degree
cycle apparatus
compressor
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PCT/JP2015/066088
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English (en)
Japanese (ja)
Inventor
秀弥 平野
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三菱電機株式会社
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Priority to PCT/JP2015/066088 priority Critical patent/WO2016194185A1/fr
Publication of WO2016194185A1 publication Critical patent/WO2016194185A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle

Definitions

  • the present invention relates to a refrigeration cycle apparatus, and more particularly to a refrigeration cycle apparatus that controls an opening degree of a throttle device provided in a refrigerant circuit based on a target superheat degree.
  • the refrigeration cycle apparatus includes, for example, a compressor, a condenser, a throttling device, and an evaporator, and includes a refrigerant circuit configured by connecting these via a refrigerant pipe.
  • the refrigeration cycle apparatus controls the opening degree of the throttle device so that the superheat degree of the refrigerant supplied to the suction side of the compressor becomes a preset value (target superheat degree) (for example, Patent Document 1).
  • target superheat degree is determined from the viewpoint of the energy efficiency of the refrigeration cycle apparatus and the liquid back.
  • the degree of superheat on the suction side of the compressor is too high, it is assumed that the amount of refrigerant passing through the evaporator is reduced accordingly, and the energy efficiency of the refrigeration cycle apparatus is reduced. Further, when the degree of superheat on the suction side of the compressor is too low, the amount of liquid refrigerant supplied to the suction side of the compressor increases, and the possibility that the compressor will fail increases. Therefore, in the refrigeration cycle device, when the degree of superheat is greater than the target superheat degree, the opening degree of the expansion device is increased, and when the degree of superheat is smaller than the target superheat degree, the opening degree of the expansion device is decreased. Control is taking place.
  • the expansion device of the refrigeration cycle apparatus determines the capacity of the expansion device in consideration of, for example, the circulation amount of the refrigerant in the refrigerant circuit when operating at the maximum capacity.
  • the larger the capacity of the expansion device the greater the change in the refrigerant state (pressure, etc.) before and after the opening degree control of the expansion device, and the greater the influence on the degree of superheat. This influence on the degree of superheat becomes more remarkable as the refrigeration cycle apparatus is operated at a lower capacity. This is because the opening degree control of the expansion device needs to be finely adjusted as the engine is operated at a lower capacity.
  • the operation of the expansion device is not stable when the superheat degree is brought close to the target superheat degree when operating at a low capacity. For example, when operating at a lower capacity, if the opening degree of the expansion device is increased so as to bring the superheat degree closer to the target superheat degree, the superheat degree greatly exceeds the target superheat degree, and the expansion device is opened. The degree will be reduced.
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a refrigeration cycle apparatus that can ensure the operational stability of the expansion device.
  • a refrigeration cycle apparatus includes a compressor, a condenser connected to a discharge side of the compressor, a first flow path connected to a downstream side of the condenser in a refrigerant flow direction, and a first flow A branch portion including a plurality of second flow paths branched from the path; a throttle device provided in each second flow path; and a downstream side of the plurality of second flow paths in the refrigerant flow direction.
  • the evaporator connected to the downstream side in the refrigerant flow direction of the junction, and the other connected to the suction side of the compressor.
  • a control device that performs opening degree control of the device.
  • the first flow path connected to the downstream side of the condenser in the refrigerant flow direction, and a branch portion including a plurality of second flow paths branched from the first flow path And a throttle device provided in each second flow path, and a merging portion connected to the downstream side in the refrigerant flow direction of the plurality of second flow paths,
  • the operational stability of the diaphragm device can be ensured over a wide range.
  • FIG. 1A is a refrigerant circuit configuration diagram of a refrigeration cycle apparatus 100 according to the present embodiment.
  • a schematic configuration of the refrigeration cycle apparatus 100 will be described with reference to FIG. 1A.
  • the refrigeration cycle apparatus 100 can be applied to, for example, a refrigeration apparatus and an air conditioner.
  • a case where the refrigeration cycle apparatus 100 is a refrigeration apparatus will be described as an example.
  • the refrigeration cycle apparatus 100 includes a compressor 1 that is used to convey a refrigerant, a condenser 2 that condenses the refrigerant, a throttling device 3 that depressurizes the refrigerant, and an evaporator 4 that evaporates the refrigerant. .
  • the refrigeration cycle apparatus 100 includes a branch portion 5 that branches the refrigerant that has flowed out of the condenser 2 and a junction portion 6 where the refrigerant branched by the branch portion 5 joins.
  • the refrigeration cycle apparatus 100 includes a blower 2 ⁇ / b> A that supplies air to the condenser 2 and a blower 4 ⁇ / b> A that supplies air to the evaporator 4.
  • the refrigeration cycle apparatus 100 includes a pressure sensor 11 that detects the pressure of refrigerant flowing on the suction side of the compressor 1, a temperature sensor 12 that detects the temperature of refrigerant flowing on the suction side of the compressor 1, and a pressure signal from the pressure sensor 11. And a control device 10 that calculates the degree of superheat using the temperature signal of the temperature sensor 12 and controls the opening degree of the expansion device 3 based on the calculated degree of superheat.
  • the compressor 1 compresses and discharges a gas refrigerant to high temperature and high pressure.
  • the compressor 1 has a refrigerant discharge side connected to the condenser 2 and a refrigerant suction side connected to the evaporator 4.
  • the condenser 2 (heat radiator) has an upstream side connected to the discharge side of the compressor 1 and a downstream side connected to the branch portion 5.
  • the condenser 2 can be constituted by, for example, a heat exchanger that exchanges heat between refrigerant and air.
  • the expansion device 3 depressurizes the refrigerant, and can be constituted by, for example, an electronic expansion valve that can adjust the opening degree.
  • the expansion device 3 includes a plurality of devices.
  • the aperture device 3 includes an aperture device 3A and an aperture device 3B.
  • the case where the refrigeration cycle apparatus 100 includes two throttle devices will be described as an example.
  • the present invention is not limited to this, and may be, for example, three or more.
  • the evaporator 4 evaporates the refrigerant into the gas refrigerant in the first connection state and the second connection state.
  • the evaporator 4 can be comprised with the heat exchanger which heat-exchanges a refrigerant
  • the branch portion 5 branches the refrigerant that has flowed out of the condenser 2.
  • the branch portion 5 can be constituted by a refrigerant pipe or the like.
  • the branch portion 5 includes a first flow path 5A whose upstream side is connected to the condenser 2, and a second flow path 5B1 and a second flow path 5B2 branched from the first flow path 5A.
  • 2nd flow path 5B1 and 2nd flow path 5B2 the upstream side is connected to 5 A of 1st flow paths, and the downstream side is connected to the junction part 6.
  • the second flow path 5B1 is provided with the expansion device 3A
  • the second flow path 5B2 is provided with the expansion device 3B.
  • the number of second flow paths corresponding to the number of expansion devices is provided.
  • the second flow path includes a second flow path 5B1 and a second flow path 5B2.
  • the junction 6 is a portion through which the refrigerant that has passed through the expansion device 3 flows.
  • the merging portion 6 has an upstream side connected to the second flow path 5B1 and the second flow path 5B2, and a downstream side connected to the evaporator 4.
  • the blower 2A is attached to the condenser 2, and the blower 4A is attached to the evaporator 4.
  • the refrigeration cycle apparatus 100 is an air conditioner, for example, the blower 2A is mounted on the outdoor unit together with the condenser 2, and the blower 4A is mounted on the indoor unit together with the evaporator 4.
  • the blower 2 ⁇ / b> A is used to supply air to the condenser 2 and promote heat exchange between the refrigerant flowing through the condenser 2 and air.
  • the blower 4 ⁇ / b> A is used to supply air to the evaporator 4 and promote heat exchange between the refrigerant flowing through the evaporator 4 and the air.
  • the pressure sensor 11 is a sensor provided in a refrigerant pipe connected to the suction side of the compressor 1, for example.
  • the pressure sensor 11 detects the pressure of the refrigerant flowing on the suction side of the compressor 1.
  • the pressure sensor 11 outputs a pressure signal to the control device 10.
  • the temperature sensor 12 is provided, for example, in a refrigerant pipe connected to the suction side of the compressor 1.
  • the temperature sensor 12 detects the temperature of the refrigerant flowing on the suction side of the compressor 1.
  • the temperature sensor 12 outputs a temperature signal to the control device 10.
  • the control device 10 is connected to the pressure sensor 11 and the temperature sensor 12, and can be configured by, for example, a microcomputer.
  • the control device 10 can calculate the degree of superheat on the suction side of the compressor 1 based on the pressure signal of the pressure sensor 11 and the temperature signal of the temperature sensor 12. And the control apparatus 10 performs opening degree control of the expansion
  • FIG. 1B is an explanatory diagram of the control device 10 included in the refrigeration cycle apparatus 100 according to the present embodiment.
  • the configuration and the like of the control device 10 will be described in detail with reference to FIG. 1B.
  • the control device 10 uses information related to the load required for the refrigeration cycle device 100 to cool the cooling target when determining the opening degree of the expansion device 3.
  • the control device 10 uses the degree of superheat on the suction side of the compressor 1 as information related to the load. For example, since the first target superheat degree X1 and the expansion device 3A are associated with each other, when the superheat degree on the suction side of the compressor 1 is equal to or less than the first target superheat degree X1, the expansion device 3A is Will open.
  • the expansion device 3B since the expansion device 3B is associated with the second target superheat degree X2 that is larger than the first target superheat degree X1, it does not open even if the superheat degree reaches the first target superheat degree X1. Even when the expansion device 3A is fully opened, the increase in the superheat degree continues, and when the superheat degree reaches the second target superheat degree X2, the expansion device 3B is opened. That is, if the expansion of the capacity of the refrigeration cycle apparatus 100 cannot be covered only by opening the expansion device 3A, the expansion device 3B is also opened.
  • the control device 10 includes a superheat degree calculation unit 10A that calculates the degree of superheat, a target superheat degree switching unit 10B1 that determines the opening degree of the expansion device 3, and an opening / closing operation that calculates the opening / closing operation frequency of the expansion devices 3A and 3B.
  • An operation frequency calculation unit 10B2 and a storage unit 10C in which information such as a target superheat degree is stored in advance are provided.
  • the control device 10 includes a throttle device control unit 10D that controls the opening degree of the throttle device 3, a compressor control unit 10E that controls the compressor 1, and a blower that controls the blower 2A and the blower 4A. And a control unit 10F.
  • the superheat degree calculation unit 10 ⁇ / b> A calculates the superheat degree on the suction side of the compressor 1 based on the pressure signal of the pressure sensor 11 and the temperature signal of the temperature sensor 12.
  • the superheat degree calculated by the superheat degree calculation unit 10A is used by the target superheat degree switching unit 10B1.
  • the target superheat degree switching unit 10B1 has a function of switching a target superheat degree preset in each expansion device 3.
  • the target superheat degree switching unit 10B1 sets the one that operates based on the first target superheat degree X1 as the expansion device 3A, and restricts the one that operates based on the second target superheat degree X2.
  • Device 3B is set.
  • the target superheat degree switching unit 10B1 uses the second target superheat degree X2 when the superheat degree calculated by the superheat degree calculation unit 10A increases and reaches the second target superheat degree X2, and It is decided to use both the diaphragm device 3A and the diaphragm device 3B. At this time, the opening degree of the expansion device 3A is fully open. Therefore, the target superheat degree switching unit 10B1 determines the opening degree of the expansion device 3B so that the superheat degree calculated by the superheat degree calculation unit 10A becomes the second target superheat degree X2.
  • the opening / closing operation frequency calculation unit 10B2 calculates the frequency of the opening / closing operation by the expansion device 3A and the expansion device 3B. For example, when the opening degree of the expansion device 3A changes once, the opening / closing operation frequency calculation unit 10B2 adds once as the number of operations of the expansion device 3A.
  • the target superheat degree switching unit 10B1 opens the expansion devices 3A and 3B so that the opening / closing operation frequency of the expansion device 3A calculated by the open / close operation frequency calculation unit 10B2 and the opening / closing operation frequency of the expansion device 3B are leveled. Determine the degree.
  • the expansion device 3A set to the first target superheat degree X1 is the expansion device 3B set to the second target superheat degree X2. Open before. For this reason, unless the switching of the target superheat degree is performed for each expansion device 3, only the frequency of use of the expansion device 3A increases, and the expansion device 3A is likely to break down.
  • the target superheat degree switching unit 10B1 performs switching such as setting the expansion device 3A to the second target superheat degree X2 and setting the expansion device 3B to the first target superheat degree X1 at a preset timing. This is performed to suppress the failure of the expansion device 3. As a result, the frequency of opening / closing operation of the expansion device 3A only increases, and it is possible to avoid a failure due to concentration of a load on the expansion device 3A.
  • the target superheat degree corresponding to each expansion device 3 is stored in advance in the storage unit 10C.
  • two target superheat degrees first target superheat degree X1 and second target superheat degree X2 are stored.
  • the storage unit 10C also stores information related to the opening / closing operation of the diaphragm device 3A and the diaphragm device 3B.
  • the expansion device control unit 10D performs opening degree control of the expansion device 3A and the expansion device 3B so that the target superheat degree switching unit 10B1 reaches the target superheat degree set in each expansion device 3.
  • the expansion device control unit 10D controls, for example, an actuator that drives the valve body of the expansion device 3.
  • the expansion device control unit 10D adjusts the expansion device 3 so that the difference between the preset target superheat degree and the superheat degree calculated by the superheat degree calculation unit 10A becomes small. Execute the opening control.
  • the opening degree control of the expansion device 3A is executed based on the difference between the superheat degree and the first target superheat degree X1. Further, when the superheat degree reaches the second target superheat degree X2, the opening degree control of the expansion device 3B is executed based on the difference between the superheat degree and the second target superheat degree X2.
  • the control software for the diaphragm apparatus 3A and the control software for the diaphragm apparatus 3B are the same. Therefore, if the difference between the superheat degree and the target superheat degree is the same, the opening degree is the same.
  • the compressor control unit 10E controls the number of revolutions of the compressor 1 according to the capacity required by the refrigeration cycle apparatus 100.
  • the blower control unit 10 ⁇ / b> F controls the rotation speeds of the blower 2 ⁇ / b> A and the blower 4 ⁇ / b> A according to the capacity required for the refrigeration cycle apparatus 100.
  • FIG. 2 is an explanatory diagram of the relationship between the change in the degree of superheat of the refrigeration cycle apparatus 100 according to the present embodiment and the opening degree of the expansion device 3.
  • the vertical axis indicates the degree of superheat on the suction side of the compressor 1
  • the horizontal axis indicates the capacity of the refrigeration cycle apparatus 100. That is, the curve in FIG. 2A shows the change in the degree of superheat when the capacity of the refrigeration cycle apparatus 100 is increased with time.
  • the vertical axis indicates the opening degree of the expansion device 3B
  • the horizontal axis is the same as that in FIG.
  • FIG. 2C the vertical axis indicates the opening of the expansion device 3A, and the horizontal axis is the same as in FIG.
  • the X1 in FIG. 2A indicates a first target superheat degree X1.
  • the first target superheat degree X1 is a superheat degree set for the expansion device 3A.
  • the second target superheat degree X2 is a superheat degree set for the expansion device 3B.
  • the control device 10 executes the opening degree control of the expansion device 3A so that the superheat degree does not deviate from the first target superheat degree X1. If the capacity of the refrigeration cycle apparatus 100 increases, the control device 10 increases the opening of the expansion device 3A so that the superheat degree does not exceed the first target superheat degree X1. Go.
  • the control device 10 executes the opening degree control of the expansion device 3B so that the superheat degree does not depart from the second target superheat degree X2.
  • the degree of superheat is greater than the first target degree of superheat X1, and the expansion device 3A remains fully open. Therefore, if the capacity of the refrigeration cycle apparatus 100 increases, the control device 10 increases the opening degree of the expansion device 3B so that the superheat degree exceeds the second target superheat degree X2. Therefore, the opening degree of the expansion device 3B is increased.
  • a plurality of target superheat degrees are set according to the capacity required for the refrigeration cycle apparatus 100.
  • the required capacity is a load required for the refrigeration cycle apparatus 100 to cool the object to be cooled.
  • this load increases as the temperature of the cooling target increases.
  • the user inputs a temperature controller or the like and sets the temperature to be cooled to be changed from the first temperature to the second temperature.
  • the refrigeration cycle apparatus 100 increases the capacity so that the temperature to be cooled can be lowered from the first temperature to the second temperature.
  • the control device 10 In order to increase the capacity of the refrigeration cycle apparatus 100, for example, when the rotational speed of the compressor 1 is increased, the control device 10 also increases the degree of superheat on the suction side of the compressor 1 and increases the opening degree of the expansion device 3. Execute control to Actually, the rotational speed of the blower 4A may be changed, but here, for convenience of explanation, a case where the rotational speed of the compressor 1 is increased when the capacity of the refrigeration cycle apparatus 100 is increased will be described.
  • the control apparatus 10 first increases only the opening degree of the expansion device 3A and keeps the expansion device 3B closed. This is because the control device 10 sets the first target superheat degree X1 for the expansion device 3A, and sets the second target superheat degree X2 larger than the first target superheat degree X1 for the expansion device 3B. This is because.
  • the control device 10 further increases the rotation speed of the compressor 1 and further increases the opening of the expansion device 3A, for example, in order to further increase the capacity of the refrigeration cycle device 100. Increase (see area A in FIG. 2).
  • the opening degree of the expansion device 3A is controlled such that the calculated superheat degree is equal to the preset first target superheat degree X1.
  • the case where not only the expansion device 3A but also the expansion device 3B is opened is a case where the calculated superheat degree reaches a second target superheat degree X2 which is larger than the first target superheat degree X1 (FIG. 2). (See area C).
  • the opening degree of the expansion device 3A and the expansion device 3B increases with time in the process of increasing the capacity of the refrigeration cycle apparatus 100.
  • capacitance of a expansion apparatus is large and fine adjustment of a superheat degree is carried out.
  • the refrigeration cycle apparatus 100 includes the branching unit 5, the expansion device 3, and the merging unit 6, and can stabilize the opening / closing operation.
  • the operation when the capacity of the refrigeration cycle apparatus 100 is increased has been mainly described.
  • the operation when the capacity is decreased is reversed. That is, in the case where the expansion device 3A is fully opened and the opening degree of the expansion device 3B is controlled, if the capacity is reduced, the expansion device 3B is closed and the expansion device 3B is fully closed. Reduce the opening of 3A.
  • FIG. 3 is an explanatory diagram of the operation and the like when the refrigeration cycle apparatus 100 according to the present embodiment changes the target superheat degree of the expansion device 3.
  • 3 (a) corresponds to FIG. 2 (a)
  • FIG. 3 (b) corresponds to FIG. 2 (b)
  • FIG. 3 (c) corresponds to FIG. 2 (c). That is, in FIG. 3A, the vertical axis indicates the degree of superheat on the suction side of the compressor 1, and the horizontal axis indicates the capacity of the refrigeration cycle apparatus 100. That is, the curve of FIG. 3A shows the change in the degree of superheat when the capacity of the refrigeration cycle apparatus 100 is increased with time.
  • FIG. 3A shows the change in the degree of superheat when the capacity of the refrigeration cycle apparatus 100 is increased with time.
  • the vertical axis indicates the opening degree of the expansion device 3B, and the horizontal axis is the same as that in FIG.
  • the vertical axis indicates the opening of the expansion device 3A
  • the horizontal axis is the same as FIG. 3A.
  • the opening / closing operation frequency calculation unit 10B2 calculates the frequency of the opening / closing operation of the expansion device 3A and the expansion device 3B. Then, the target superheat degree switching unit 10B1 is configured so that the opening / closing operation frequency of the expansion device 3A calculated by the opening / closing operation frequency calculation unit 10B2 and the opening / closing operation frequency of the expansion device 3B are equalized.
  • the target superheat degree of 3B is set. That is, when the opening / closing operation frequency of the expansion device 3A having a low target superheat degree increases, the control device 10 changes the target superheat degree of the expansion device 3A to a larger one. That is, the first target superheat degree X1 is set in the expansion device 3B, and the second target superheat degree X2 is set in the expansion device 3A.
  • the controller 10 first increases only the opening of the expansion device 3B and closes the expansion device 3A.
  • the control device 10 further increases the rotation speed of the compressor 1 and further increases the opening of the expansion device 3B, for example, in order to further increase the capacity of the refrigeration cycle device 100. Increase (see area A in FIG. 3).
  • the opening degree of the expansion device 3B is controlled so that the calculated superheat degree is equal to the preset first target superheat degree X1.
  • FIG. 4 is an explanatory diagram of operations and the like when the normal operation throttle device (throttle device 3A) of Modification 1 of the refrigeration cycle apparatus 100 according to the present embodiment fails.
  • FIG. 5 is an explanatory diagram of the operation and the like of the backup diaphragm device (throttle device 3B) of a modification of the refrigeration cycle apparatus 100 according to the present embodiment.
  • 4 (a) and 5 (a) correspond to FIG. 2 (a)
  • FIG. 4 (b) and FIG. 5 (b) correspond to FIG. 2 (b)
  • FIG. 4 (c) and FIG. (C) corresponds to FIG. 2 (c). That is, in FIG. 4A and FIG.
  • the vertical axis indicates the degree of superheat on the suction side of the compressor 1, and the horizontal axis indicates the capacity of the refrigeration cycle apparatus 100.
  • the curve of Fig.4 (a) and Fig.5 (a) has shown the change of the superheat degree when the capability of the refrigerating-cycle apparatus 100 is increased with time.
  • the vertical axis indicates the opening degree of the expansion device 3B, and the horizontal axis is the same as in FIGS. 4 (a) and 5 (a).
  • 4 (c) and 5 (c) the vertical axis indicates the opening of the expansion device 3A, and the horizontal axis is the same as in FIGS. 4 (a) and 5 (a).
  • the device used for normal operation is the expansion device 3A
  • the device used for backup is the expansion device 3B.
  • the opening degree of the expansion device 3A is controlled so that the superheat degree becomes the first target superheat degree X1.
  • the calculated degree of superheat increases (see area D in FIG. 5A).
  • the control device 10 determines that the expansion device 3A has failed and executes the opening degree control of the expansion device 3B.
  • the expansion device 3B performs opening degree control so that the calculated target superheat degree becomes the second target superheat degree X2 (see area E in FIG. 5A).
  • the control device 10 of the refrigeration cycle apparatus 100 determines the failure of the expansion device 3A based on the calculated superheat degree and the second target superheat degree X2. For this reason, the cost increase of the refrigeration cycle apparatus 100 can be suppressed.
  • FIG. 6 is a refrigerant circuit configuration diagram of Modification 2 of the refrigeration cycle apparatus 100 according to the present embodiment.
  • a modification 2 of the refrigeration cycle apparatus 100 will be described with reference to FIG.
  • the second modification is different from the refrigeration cycle apparatus 100 according to the present embodiment in that the second flow path 5B3 is added to the branching section 5 and the expansion device 3C is added to the expansion device 3.
  • Other configurations are the same.
  • the opening / closing operations of the expansion device 3A and the expansion device 3B are the same as those of the refrigeration cycle apparatus 100 according to the present embodiment.
  • the refrigeration cycle apparatus 100 includes a compressor 1, a condenser 2 connected to the discharge side of the compressor 1, and a first flow connected to the downstream side of the condenser 2 in the refrigerant flow direction.
  • a branch section 5 including a path 5A, a second flow path 5B1 and a second flow path 5B2 branched from the first flow path 5A, and a throttling device 3 provided in each second flow path;
  • the merging portion 6 connected to the downstream side in the refrigerant flow direction of the second flow path 5B1 and the second flow path 5B2, and one is connected to the downstream side in the refrigerant flow direction of the merging section 6, and the other is the compressor 1.
  • the evaporator 4 connected to the suction side of the compressor 1 and the control device 10 for controlling the opening degree of each expansion device 3 based on the target superheat degree on the suction side of the compressor 1 are provided.
  • FIG. 7 is a refrigerant circuit configuration diagram of a conventional refrigeration cycle apparatus 200.
  • FIG. 8 is an explanatory diagram of the relationship between the change in the degree of superheat of the conventional refrigeration cycle apparatus 200 and the opening of the expansion device.
  • FIG. 8A corresponds to FIG. 2A
  • FIG. 8B corresponds to FIG. 2B and FIG.
  • the horizontal axis represents time, unlike FIGS.
  • the conventional refrigeration cycle apparatus 200 has a configuration in which one expansion device 3 is arranged for one evaporator 4. Therefore, the opening / closing operation of the expansion device 3 is not stable in a state where the load generated in the cooling target is small and the rotation speed of the compressor 1 is low. Specifically, the capacity of the expansion device 3 is increased so that the single expansion device 3 can cover the maximum capacity of the refrigeration cycle apparatus 200. Therefore, when the opening degree of the expansion device 3 is adjusted, the influence of the degree of superheat tends to be large.
  • the expansion device 3 when the expansion device 3 performs the opening degree control in the state where the refrigeration cycle apparatus 200 is operating with a low capacity, the degree of superheat tends to greatly deviate from the target degree of superheat ( (See arrow AR1 in FIG. 8A). For example, for this reason, the expansion device 3 executes control for reducing the opening degree even though the opening degree is increased, and the operation is not stable (see the arrow AR2 in FIG. 8B).
  • the refrigeration cycle apparatus 100 according to the present embodiment has the above-described configuration, it is possible to ensure the operational stability of the expansion device 3 in a wide range of operating capacity of the refrigeration cycle apparatus 100. it can.
  • both the expansion device 3A and the expansion device 3B are set to one target superheat degree and the same control software is used.
  • the superheat degree cannot be finely adjusted as in the conventional refrigeration cycle apparatus.
  • a means for setting both the expansion device 3A and the expansion device 3B to one target superheat degree and providing individual control software for each of the expansion device 3A and the expansion device 3B can be considered. That is, individual control software is provided for each expansion device 3 so that the operation of each expansion device 3 is not necessarily the same, so that the superheat degree can be finely adjusted. However, in this case, individual control software is required for each combination of the diaphragm devices 3. Here, the combination is determined by the capacity, specifications, number, etc. of the diaphragm device 3.
  • the control software executes, for example, calculation such as how to set the opening degree of the expansion device 3 at a certain degree of superheat.
  • a plurality of target superheat degrees (first target superheat degree X1 and second target superheat degree X2) are provided to be shifted, and each target superheat degree is set for each expansion device. ing. For this reason, it is possible to finely adjust the superheat degree only by providing one control software. Thereby, refrigeration cycle apparatus 100 concerning this embodiment can aim at unification of control software used for control device 10, and can control an increase in cost.
  • the control device 10 of the refrigeration cycle apparatus 100 is configured such that the number of the expansion devices 3 to be opened varies depending on the target degree of superheat. For example, when the target superheat degree is the first target superheat degree X1, the expansion device 3A or the expansion device 3B is opened, and when the target superheat degree is the second target superheat degree X2, Both the diaphragm device 3A and the diaphragm device 3B are opened. More specifically, the control device 10 of the refrigeration cycle apparatus 100 according to the present embodiment includes a target superheat degree (first target superheat degree X1 and second target superheat degree) used for execution of opening / closing control of the expansion device 3.
  • a target superheat degree first target superheat degree X1 and second target superheat degree
  • the number of the expansion devices 3 that are opened differs depending on the magnitude of the target superheat degree. For example, when the expansion device 3A executes control based on the first target superheat degree X1, and the expansion device 3B executes control based on the second target superheat degree X2, the control device 10 As the rotational speed of the compressor 1 increases, first, the compressor 3A is opened.
  • the superheat degree reaches the first target superheat degree X1 as the rotation speed of the compressor 1 increases, but the throttle device is gradually increased so that the superheat degree does not exceed the first target superheat degree X1.
  • the expansion device 3B is fully closed. Even when the expansion device 3A is fully opened, if the heating degree increases, the expansion device 3B is then opened. That is, the control device 10 opens the expansion device 3B when the superheat degree reaches the second target superheat degree X2, and the control device 10 sets the expansion device 3B so that the superheat degree does not exceed the second target superheat degree X2. Increase the opening.
  • the control device 10 of the refrigeration cycle apparatus 100 switches the target superheat degree set for each expansion device 3 so that the opening / closing operation frequency of each expansion device 3 is leveled. Is. That is, when considering the case of gradually increasing the capacity of the refrigeration cycle apparatus 100, the expansion device 3A set to the first target superheat degree X1 is the throttle set to the second target superheat degree X2. Open before device 3B. For this reason, unless switching of the target superheat degree is performed for each expansion device 3, only the use frequency of the expansion device 3A increases, and the possibility that the expansion device 3A breaks down increases.
  • the refrigeration cycle apparatus 100 executes, for example, setting the expansion device 3A to the second target superheat degree X2, setting the expansion device 3B to the first target superheat degree X1, and the like. It is possible to suppress the failure of the diaphragm device 3.
  • the control device 10 of the refrigeration cycle apparatus 100 calculates the opening / closing operation frequency of each expansion device 3 when the compressor 1 is stopped, and switches the target superheat degree from among the plurality of expansion devices. Is determined.
  • the control device 10 of the refrigeration cycle apparatus 100 according to the present embodiment calculates the opening / closing operation frequency of the expansion device 3A and the expansion device 3B, and the timing of the compressor 1 is reflected as the timing to reflect the calculated opening / closing operation frequency. The stop time is used.
  • the target superheat degree of the expansion device 3A and the target superheat degree of the expansion device 3B are interchanged, and the operating frequencies of the expansion device 3A and the expansion device 3B are leveled at an appropriate timing. be able to.
  • the control device 10 of the refrigeration cycle apparatus 100 opens or closes another throttling device that is fully closed or fully open after fully opening or closing one of the plurality of throttling devices.
  • the expansion devices 3 have the same capacity.
  • the control device 10 opens the expansion device 3B after fully opening the expansion device 3A. As described above, since one of the throttling devices 3 is fully opened and the other throttling devices 3 are opened, it is possible to avoid performing calculations for determining the opening degrees of the plurality of throttling devices 3 in parallel. And the calculation load of the control device 10 can be suppressed.
  • the refrigeration cycle apparatus 100 includes at least two or more normal operation throttle devices that are used during normal operation, and at least one backup throttle device that is closed during normal operation, When at least one of the normal operation throttle devices fails and cannot be opened, the control device 10 opens the backup throttle device and continues the operation of the compressor 1. Thereby, the refrigeration cycle apparatus 100 can continue the operation without the emergency stop of the compressor 1 even if any of the expansion devices 3 breaks down.
  • the refrigeration cycle apparatus 100 further includes a temperature sensor 12 that detects a temperature on the suction side of the compressor 1 and a pressure sensor 11 that detects a pressure on the suction side of the compressor 1, and includes a control device 10.
  • the pressure signal of the pressure sensor 11 and the temperature signal of the temperature sensor 12 are output, and the opening degree control of each expansion device 3 is executed based on the target superheat degree and the superheat degree based on the pressure signal and the temperature signal.
  • the control device 10 calculates the degree of superheat based on the pressure signal from the pressure sensor 11 and the temperature signal from the temperature sensor 12.
  • the expansion device 3A in which the first target superheat degree X1 is set is opened, and the second target superheat degree X2 is reached.
  • the expansion device 3B set to the second target superheat degree X2 is also opened.
  • the opening / closing operation frequency calculation unit 10B2 automatically calculates the opening / closing operation frequency of the expansion device 3 and switches the target degree of superheat set in each expansion device 3. It is not limited to that. An administrator of the refrigeration cycle apparatus 100 may be able to manually switch each target superheat degree set in each expansion device 3 as appropriate.
  • the control device 10 may calculate the size of the operating rate of each expansion device 3.
  • this Embodiment demonstrated the case where the opening / closing operation frequency of each expansion device 3 was calculated when the compressor 1 stopped, it is not limited to it.
  • the timing when the compressor 1 stops it may be a timing for every operation of the refrigeration cycle apparatus 100, a timing for each day, or a timing for each month.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

La présente invention a pour objet de fournir un dispositif de cycle de réfrigération qui peut assurer la stabilité de fonctionnement d'un dispositif d'étranglement. Le dispositif de cycle de réfrigération (100) selon la présente invention est équipé : d'un compresseur (1) ; d'un condenseur (2) qui est raccordé au côté refoulement du compresseur ; d'une partie de ramification (5) qui comprend un premier trajet d'écoulement (5A) raccordé au côté aval du condenseur dans la direction d'écoulement d'agent réfrigérant et une pluralité de seconds trajets d'écoulement (5B1, 5B2) qui se ramifient depuis le premier trajet d'écoulement ; de dispositifs d'étranglement (3) qui sont disposés dans les seconds trajets d'écoulement ; d'une partie de fusion (6) qui est raccordée au côté aval de la pluralité de seconds trajets d'écoulement dans la direction d'écoulement d'agent réfrigérant ; d'un évaporateur (4), dont un côté est raccordé au côté aval de la partie de fusion dans la direction d'écoulement d'agent réfrigérant, et dont l'autre côté est raccordé au côté admission du compresseur ; et d'un dispositif de commande (10) qui commande l'ouverture de chaque dispositif d'étranglement sur la base du degré de surchauffe cible côté admission du compresseur.
PCT/JP2015/066088 2015-06-03 2015-06-03 Dispositif de cycle de réfrigération WO2016194185A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017211099A (ja) * 2016-05-23 2017-11-30 株式会社鷺宮製作所 冷凍装置
WO2020144843A1 (fr) * 2019-01-11 2020-07-16 三菱電機株式会社 Appareil de climatisation

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JPS61181271U (fr) * 1985-04-27 1986-11-12
JPS6288256U (fr) * 1985-11-22 1987-06-05
JPS6373060A (ja) * 1986-09-13 1988-04-02 ダイキン工業株式会社 冷凍装置
JPH02146466A (ja) * 1988-11-28 1990-06-05 Mitsubishi Electric Corp 冷媒回路
JPH03217771A (ja) * 1990-01-22 1991-09-25 Sanyo Electric Co Ltd 空気調和装置
WO2003064940A1 (fr) * 2002-01-28 2003-08-07 Toshiba Carrier Corporation Conditionneur d'air
JP2006525907A (ja) * 2003-05-09 2006-11-16 クノール−ブレームス レール システムス （ユーケー） リミテッド 鉄道車両用制動制御システム
US20080289346A1 (en) * 2004-08-09 2008-11-27 Linde Kaeltetechanik Gmbh & Co. Kg Refrigeration Circuit and Method of Operating a Refrigeration Circuit
JP2010501826A (ja) * 2006-09-01 2010-01-21 チャンジョ ２１ シーオー．，エルティディ． 通信装備用冷房装置
JP2010230274A (ja) * 2009-03-27 2010-10-14 Mitsubishi Electric Corp 浴室用乾燥暖房機および浴室用乾燥暖房機の制御方法
JP2012251730A (ja) * 2011-06-03 2012-12-20 Azbil Corp 室圧制御システム
JP2013002740A (ja) * 2011-06-17 2013-01-07 Saginomiya Seisakusho Inc 電子膨張弁の制御装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61181271U (fr) * 1985-04-27 1986-11-12
JPS6288256U (fr) * 1985-11-22 1987-06-05
JPS6373060A (ja) * 1986-09-13 1988-04-02 ダイキン工業株式会社 冷凍装置
JPH02146466A (ja) * 1988-11-28 1990-06-05 Mitsubishi Electric Corp 冷媒回路
JPH03217771A (ja) * 1990-01-22 1991-09-25 Sanyo Electric Co Ltd 空気調和装置
WO2003064940A1 (fr) * 2002-01-28 2003-08-07 Toshiba Carrier Corporation Conditionneur d'air
JP2006525907A (ja) * 2003-05-09 2006-11-16 クノール−ブレームス レール システムス （ユーケー） リミテッド 鉄道車両用制動制御システム
US20080289346A1 (en) * 2004-08-09 2008-11-27 Linde Kaeltetechanik Gmbh & Co. Kg Refrigeration Circuit and Method of Operating a Refrigeration Circuit
JP2010501826A (ja) * 2006-09-01 2010-01-21 チャンジョ ２１ シーオー．，エルティディ． 通信装備用冷房装置
JP2010230274A (ja) * 2009-03-27 2010-10-14 Mitsubishi Electric Corp 浴室用乾燥暖房機および浴室用乾燥暖房機の制御方法
JP2012251730A (ja) * 2011-06-03 2012-12-20 Azbil Corp 室圧制御システム
JP2013002740A (ja) * 2011-06-17 2013-01-07 Saginomiya Seisakusho Inc 電子膨張弁の制御装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017211099A (ja) * 2016-05-23 2017-11-30 株式会社鷺宮製作所 冷凍装置
WO2020144843A1 (fr) * 2019-01-11 2020-07-16 三菱電機株式会社 Appareil de climatisation

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