WO2019189767A1 - Dispositif de chauffage, procédé de chauffage, et procédé de récupération de réfrigérant - Google Patents

Dispositif de chauffage, procédé de chauffage, et procédé de récupération de réfrigérant Download PDF

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Publication number
WO2019189767A1
WO2019189767A1 PCT/JP2019/014011 JP2019014011W WO2019189767A1 WO 2019189767 A1 WO2019189767 A1 WO 2019189767A1 JP 2019014011 W JP2019014011 W JP 2019014011W WO 2019189767 A1 WO2019189767 A1 WO 2019189767A1
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WIPO (PCT)
Prior art keywords
conductive film
refrigerant
accumulator
film heater
heating
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PCT/JP2019/014011
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English (en)
Japanese (ja)
Inventor
隆治 門井
勝也 谷口
亜加音 野村
昇 和田
Original Assignee
三菱電機ビルテクノサービス株式会社
三菱電機株式会社
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Application filed by 三菱電機ビルテクノサービス株式会社, 三菱電機株式会社 filed Critical 三菱電機ビルテクノサービス株式会社
Priority to JP2019568269A priority Critical patent/JP6789420B2/ja
Publication of WO2019189767A1 publication Critical patent/WO2019189767A1/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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • 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
    • F25B45/00—Arrangements for charging or discharging refrigerant

Definitions

  • the present invention relates to a heating device, a heating method, and a refrigerant recovery method.
  • a charge hose of the refrigerant recovery device is connected to a service port provided in the outdoor unit.
  • the service port is a connection port that connects an external recovery device or filling device to the refrigerant circuit when the refrigerant is recovered from the refrigerant circuit or when the refrigerant is charged.
  • This service port includes a liquid pipe service port (high pressure side port) provided in the liquid pipe of the refrigerant circuit and a gas pipe service port (low pressure side port) provided in the gas pipe of the refrigerant circuit.
  • the gas pipe service port is provided adjacent to the accumulator which is a liquid separator in the refrigerant circuit.
  • the refrigerant circuit is depressurized by extracting the refrigerant gas from the gas pipe service port. Accordingly, the accumulator provided in the refrigerant circuit is depressurized. As the pressure is reduced, the refrigerant liquid in the accumulator is vaporized. During this vaporization, the refrigerant gas loses heat of vaporization, and the temperature in the accumulator is lowered. As a result, vaporization of the refrigerant liquid in the accumulator slows down, and the refrigerant recovery operation is delayed.
  • the accumulator is heated when the refrigerant is recovered.
  • a silicon rubber heater is used as a heating device for the accumulator.
  • the silicon rubber heater is a heating body in which an electric wire such as a nichrome wire is covered with silicon rubber which is an insulator.
  • the silicon rubber heater has flexibility, and even if the accumulator has a saddle shape, the silicon rubber heater can be deformed into a shape that follows the shape. For this reason, a silicon rubber heater can heat an accumulator effectively compared with a flat and hard heater, for example.
  • an object of the present invention is to provide a heating device that can ensure appropriate heating even when the shape of the accumulator is changed to follow.
  • the present invention relates to a heating device that heats an accumulator provided in a refrigerant circuit during refrigerant recovery.
  • the said heating apparatus is provided with the electrically conductive film heater which heats an accumulator.
  • the conductive film heater may have a layered shape and may include a pair of electrodes that are separated in the axial short direction and extend in the axial long direction.
  • the conductive film heater may include a conductive film between a pair of electrodes.
  • a magnet layer attached to an accumulator having a magnetic member may be provided.
  • the magnet layer is laminated on the conductive film heater.
  • a protective layer for sandwiching the conductive film heater with the magnet layer may be provided.
  • the conductive film heater laminated on the magnet layer may be a flexible member.
  • the conductive film heater may have a smooth surface layer in contact with the accumulator.
  • a supply circuit for supplying power to the pair of electrodes may be provided.
  • the supply circuit supplies power
  • the conductive film generates heat.
  • a detection unit that detects the temperature of the conductive film heater and a circuit breaker that suppresses supply by the supply circuit when the temperature detected by the detection unit exceeds a predetermined value may be provided.
  • the conductive film heater may be composed of a plurality of conductive film heater units.
  • the magnet layer may be composed of a plurality of magnet layer segments.
  • the plurality of magnet layer segments may be juxtaposed in the axial direction.
  • a control unit that suppresses power supply by the supply circuit based on a current flowing through the supply circuit may be provided.
  • the control unit is supplied with power from the supply circuit.
  • the control unit suppresses power supply by the supply circuit when the current flowing through the supply circuit becomes less than the first threshold.
  • a control unit that suppresses power supply by the supply circuit based on a current flowing through the supply circuit may be provided.
  • power is supplied to the control unit from a circuit different from the supply circuit.
  • the control unit suppresses power supply by the supply circuit when the current flowing through the supply circuit is less than the first threshold and exceeds a second threshold that is lower than the first threshold and greater than or equal to 0A.
  • the present invention also relates to a heating method for heating an accumulator provided in a refrigerant circuit of an air conditioning system.
  • the method includes a step of attaching the conductive film heater to the accumulator and a step of heating the accumulator by the attached conductive film heater when recovering the refrigerant of the air conditioning system.
  • the present invention also relates to a refrigerant recovery method for recovering refrigerant of an air conditioning system.
  • the method includes a step of attaching the conductive film heater to the accumulator, a step of heating the accumulator with the attached conductive film heater, and a step of recovering the refrigerant through the accumulator heated by the conductive film heater.
  • the present invention it is possible to provide a heating apparatus that can ensure appropriate heating even when the accumulator is deformed so as to follow the shape of the accumulator.
  • the air conditioner 20 that is the target of refrigerant recovery
  • the air conditioner 20 that is the target of refrigerant recovery
  • the air conditioner 20 that is the target of refrigerant recovery
  • the air conditioner that is the target of refrigerant recovery may be a package type air conditioner, a commercial refrigeration showcase, a chiller, a turbo refrigerator, or the like.
  • symbol is attached
  • an operation example of the air-conditioning equipment during the cooling operation is shown.
  • FIG. 1 is a configuration diagram of the refrigerant recovery system 10.
  • the refrigerant recovery system 10 includes an air conditioner 20, a heating device 70, a refrigerant recovery device 100, a refrigerant recovery container 102, and a plurality of pipes that connect these components.
  • the refrigerant recovery system 10 recovers the refrigerant used in the air conditioner 20 in the refrigerant recovery container 102 using the refrigerant recovery apparatus 100.
  • the air conditioner 20 is an air conditioner that keeps the indoor environment of a building in a good state by circulating refrigerant compression, condensation, and evaporation.
  • the air conditioner 20 includes an outdoor unit 22 and an indoor unit 24.
  • the outdoor unit 22 and the indoor unit 24 are connected by a liquid pipe 26 and a gas pipe 28.
  • the indoor unit 24 includes an evaporator 30, an expansion valve 32, and a fan 34.
  • the high-temperature and high-pressure refrigerant liquid that has passed through the condenser 36 of the outdoor unit 22 reaches the expansion valve 32 from the liquid pipe 26.
  • the refrigerant liquid pressure is reduced by the throttle of the expansion valve 32, and is sent to the evaporator 30 as a low-temperature and low-pressure refrigerant liquid.
  • the evaporator 30 the room temperature air sent by the fan 34 and the refrigerant liquid exchange heat.
  • the refrigerant after heat exchange becomes low-temperature and low-pressure refrigerant vapor and is sent to the outdoor unit 22 via the gas pipe 28.
  • the outdoor unit 22 includes a condenser 36, a compressor 38, an accumulator 40, and a fan 44.
  • the refrigerant vapor sent from the gas pipe 28 to the outdoor unit 22 passes through the accumulator 40.
  • the accumulator 40 is a liquid separator that is provided in the refrigerant circuit and separates the liquid from the refrigerant vapor. The liquid is removed from the refrigerant vapor by the accumulator 40 in the front stage of the compressor 38, so that liquid compression in which the refrigerant liquid is compressed in the compressor 38 is prevented.
  • FIG. 2 illustrates a perspective view of the outdoor unit 22.
  • the casing 41 of the accumulator 40 is a pressure vessel, and is formed in, for example, a vertically long jade shape. That is, the upper end portion of the casing 41 has a hemispherical shape on the dome, and the lower end portion has a hemispherical shape that reverses this and draws an arch downward. Moreover, the intermediate part has a cylindrical shape so as to connect these hemispheres.
  • the casing 41 is made of a magnetic material (magnetic member) such as iron.
  • the refrigerant liquid is stored inside the casing 41 of the accumulator 40.
  • a heating device 70 (see FIG. 3) according to the present embodiment is attached to the outer surface of the casing 41 in order to heat the refrigerant liquid stored in the accumulator 40.
  • the refrigerant compressed by the compressor 38 reaches the condenser 36 as high-temperature and high-pressure refrigerant vapor.
  • the outside air sent by the fan 44 and the refrigerant vapor exchange heat.
  • the refrigerant after the heat exchange is sent to the liquid pipe 26 and the indoor unit 24 as a high-temperature and high-pressure refrigerant liquid.
  • the outdoor unit 22 includes a liquid pipe stop valve 46 and a gas pipe stop valve 48.
  • the outdoor unit liquid pipe 54 is connected to one port, and the liquid pipe 26 is connected to the other port.
  • a liquid pipe service port 50 is provided adjacent to the liquid pipe stop valve 46.
  • the liquid pipe service port 50 is a connection port that connects an external collection device or filling device to the refrigerant circuit when the refrigerant liquid is collected from the refrigerant circuit or filled with the refrigerant liquid.
  • a liquid pipe charge hose 58 for refrigerant liquid recovery is connected to the liquid pipe service port 50.
  • the outdoor unit gas pipe 56 is connected to one port, and the gas pipe 28 is connected to the other port.
  • a gas pipe service port 52 is provided adjacent to the gas pipe stop valve 48.
  • the gas pipe service port 52 is a connection port that connects an external recovery device or filling device to the refrigerant circuit when the refrigerant gas is recovered from the refrigerant circuit or filled with the refrigerant gas.
  • a gas pipe charge hose 60 for refrigerant gas recovery is connected to the gas pipe service port 52.
  • the gas pipe stop valve 48 is provided in front of the accumulator 40 with the outdoor unit gas pipe 56 interposed therebetween. With such an arrangement, the accumulator 40 is depressurized when the refrigerant is recovered.
  • the refrigerant recovery apparatus 100, the refrigerant recovery container 102, and the gauge manifold 104 are used for recovering the refrigerant of the air conditioner 20.
  • the gauge manifold 104 is a refrigerant manifold provided in the middle of a pipe line connecting the liquid pipe service port 50 and the gas pipe service port 52 and the refrigerant recovery device 100, and is provided with a high pressure side pressure gauge and a low pressure side pressure gauge.
  • the recovery operator performs blocking or connection between the liquid pipe service port 50 and the gas pipe service port 52 and the refrigerant recovery apparatus 100 while looking at the indication value of the pressure gauge.
  • the air conditioner 20 includes a gaseous refrigerant and a liquid refrigerant, and a large amount of liquid refrigerant is recovered by using a well-known push-pull recovery method and sending the liquid refrigerant directly to the refrigerant recovery container 102. be able to.
  • the refrigerant collecting apparatus 100 receives the refrigerant gas from the air conditioner 20 via the gauge manifold 104. Further, the refrigerant recovery apparatus 100 compresses the received refrigerant gas and sends it to the refrigerant recovery container 102.
  • ⁇ Configuration of heating device> 3 and 4 illustrate perspective views of the heating device 70 according to the present embodiment.
  • FIG. 3 an angle heating device 70 whose contact surface that contacts the outer surface of the casing 41 of the accumulator 40 is on the upper side is illustrated, and in FIG. 4, an angle heating device 70 that is turned upside down is illustrated.
  • the heating device 70 has an elongated, substantially strip shape extending in a uniaxial direction, and a wiring 71 is connected to one end (rear end) of a long axis (A-axis direction in the drawing) along the extending direction.
  • the other end (front end) opposite to one end (rear end) to which the wiring 71 is connected becomes a front end portion 72 when the heating device 70 is inserted into the outdoor unit 22.
  • the heating device 70 is attached to the lower end of the accumulator 40 as will be described later.
  • the separation distance between the lowermost end of the accumulator 40 and the floor surface of the housing of the outdoor unit 22 is about 10 mm or less, and the heating device 70 is inserted into this gap. From this, the thickness of the heating device 70 is formed to be, for example, 10 mm or less, desirably 5 mm or less.
  • the front end portion 72 has a triangular shape in plan view, and is inclined with respect to the long axis (A axis) toward the center of the short axis (B axis) direction (width direction) perpendicular to the long axis (A axis). It is formed to intersect.
  • the tip 72 By providing the tip 72 with such a shape (pointed shape), the heating device 70 can be easily attached to the accumulator 40 as described later.
  • the tip 72 has a triangular shape, a magnet layer 73 described later is extended further forward than the front end of the conductive film heater 80 described later, as illustrated on the left side of FIG.
  • the front end of the heating device 70 ⁇ / b> A shown as a comparative example is rectangular, and the front end thereof is slightly forward from the front end of the conductive film heater 80.
  • the heating device 70 has a strong magnetic force at the center in the short axis (B-axis) direction. Therefore, as will be described later, when the heating device 70 is attached to the accumulator 40, even if the front portion of the tip 72 is peeled off, the back portion of the tip 72 is adsorbed by the accumulator 40.
  • the tip portion of the conductive film heater 80 at the back of the accumulator 40 is prevented from peeling off from the accumulator 40.
  • the pair of electrodes 81 ⁇ / b> A and 81 ⁇ / b> B is not disposed at the tip portion 72.
  • FIG. 6 illustrates an exploded perspective view of the heating device 70 having the angle shown in FIG.
  • the heating device 70 has a laminated structure, and includes a conductive film heater 80, a magnet layer 73, a protective layer 74, and a smooth surface layer 75.
  • the heating device 70 has flexibility as a whole, and can be deformed along the shape of the accumulator 40 to which it is attached.
  • each layer which comprises the heating apparatus 70 is provided with flexibility, and the heating apparatus 70 which is the laminated body is also provided with flexibility.
  • the conductive film heater 80 is a layered heater, and includes a pair of electrodes 81A and 81B, a conductive film 82, a thermostat 83, a current sensor 84 (see FIG. 7), a circuit breaker 85, a control unit 86, and an insertion plug 87. .
  • a supply circuit for supplying power from the commercial power supply 90 to the conductive film heater 80 is formed.
  • a plurality of conductive film heaters 80 may be provided in one heating device 70. By doing so, even if the conductive film 82 of one conductive film heater unit is damaged and the conduction is interrupted, the heating is maintained by the other conductive film heater unit.
  • the pair of electrodes 81A and 81B are isolated in the short axis direction (B axis direction) and extend in the long axis direction (A axis direction).
  • a conductive film 82 is provided between the pair of electrodes 81A and 81B. That is, the pair of electrodes 81A and 81B are electrically connected by the conductive film 82.
  • the conductive film 82 is made of a metal oxide such as indium oxide (In 2 O 3 ), zinc oxide (ZnO), or tin oxide (SnO 2 ).
  • a metal oxide such as indium oxide (In 2 O 3 ), zinc oxide (ZnO), or tin oxide (SnO 2 ).
  • the conductive film 82 has conductivity over the entire surface. For example, as illustrated in FIG. 8, even if a crack 88 occurs in a part of the conductive film 82, the remaining parts cause the electrodes 81 ⁇ / b> A and 81 ⁇ / b> B. The continuity between them is maintained. Since the conductive film 82 is wider than a conventional electric wire, the conductive film 82 has a structure that is unlikely to be damaged such that conduction is interrupted even when the conductive film 82 is deformed to follow the shape of the accumulator 40. Therefore, appropriate heating can be ensured. As described above, in the present embodiment, by configuring the heater conductor from the conductive film 82, the heating effect can be sustained even if a part of the conductor of the heating device 70 is damaged.
  • thermostat 83 is disposed on an arbitrary region of conductive film 82.
  • the thermostat 83 is a detection unit that detects the temperature of the conductive film heater 80, and also functions as a circuit breaker that suppresses and cuts off the power supply by the supply circuit when the temperature exceeds a predetermined value.
  • the thermostat 83 is arranged so that the heat detection surface is in contact with the conductive film 82. Further, the thermostat 83 is disposed on the back surface of the conductive film 82 facing the surface facing the casing 41 of the accumulator 40. By disposing the thermostat 83 on the back surface, unevenness due to the thermostat 83 does not have to be formed on the surface of the heating device 70. That is, the surface of the heating device 70 can be configured to be flat (flat). Therefore, the entire surface including the region where the thermostat 83 is disposed can be brought into contact with the casing 41 of the accumulator 40.
  • the thermostat 83 is provided on a supply circuit that supplies power to the pair of electrodes 81A and 81B of the conductive film heater 80.
  • the width of the thermostat 83 in the short axis direction (B axis direction) is preferably shorter than the distance between the pair of electrodes 81A and 81B. Further, it is desirable to arrange the thermostat 83 so that the width in the axial direction (B-axis direction) is shorter than the width in the axial length direction (A-axis direction). As will be described later, the region of the magnet layer 73 that overlaps the thermostat 83 is cut out and becomes a region where the magnetic force does not reach.
  • the thermostat 83 When the thermostat 83 is heated to a predetermined temperature or higher, the internal conduction is cut off.
  • the thermostat 83 has a bimetal structure, and when the bimetal structure is heated to a predetermined temperature (for example, 40 ° C. or more), the thermostat 83 is switched from a conductive state to a cut-off state.
  • a predetermined temperature for example, 40 ° C. or more
  • the supply circuit for supplying power to the conductive film heater 80 is provided with a mechanism for cutting off the circuit in accordance with the supply current.
  • the current sensor 84 measures a current value flowing through the supply circuit. The measured current value is transmitted to the control unit 86.
  • the control unit 86 is composed of, for example, a circuit board equipped with a CPU and a memory.
  • the controller 86 determines whether or not the current value sent from the current sensor 84 is less than a predetermined threshold value. When the current value is less than the threshold value, there is a possibility that the conductive film 82 has been damaged. Therefore, the control unit 86 operates the circuit breaker 85 to switch from the conductive state to the cut-off state. This shuts off the supply circuit.
  • control flow is constructed so that the current value determination and the operation of the thermostat 83 do not interfere with each other. For example, when the thermostat 83 is switched from the conductive state to the cut-off state, the current value of the supply circuit becomes zero, which is reflected in the current value determination, and it may be erroneously determined that the conductive film 82 is damaged. Therefore, it is desirable that the control flow of the control unit 86 be constructed so that the current value determination is performed only when the thermostat 83 is in a conductive state (current is flowing).
  • the resin substrate 91 may be composed of, for example, a polyimide sheet having a pair of electrodes 81A and 81B and a conductive film 82 sandwiched (bonded) to each other.
  • a magnet layer 73 is laminated on the conductive film heater 80. Specifically, the magnet layer 73 is laminated on the back surface of the surface of the conductive film heater 80 facing the front surface facing the casing 41 of the accumulator 40. The magnet layer 73 adheres (adsorbs) to the casing 41 of the accumulator 40 via the conductive film heater 80, the protective layer 74, and the smooth surface layer 75.
  • the magnet layer 73 has flexibility, and is composed of, for example, a magnet sheet composed of a resin binder containing ferrite or a neodymium magnet flat sheet.
  • the thickness of the magnet layer 73 may be about 1 mm, for example.
  • the region of the magnet layer 73 that overlaps the thermostat 83 is opened, from which the thermostat 83 and the wires connected thereto are taken out and connected to the wiring 71.
  • the magnet layer 73 is composed of a single member (so-called one piece).
  • the magnet layer 73 is provided over the entire region excluding the opening for the thermostat 83 (shown in FIG. 6) or the entire region excluding the vicinity of the thermostat 83 and the wiring behind it.
  • the magnet layer 73 is disposed in the conductive film heater region from the thermostat 83 to the tip portion 72.
  • the protective layer 74 is laminated so as to sandwich the conductive film heater 80 together with the magnet layer 73. That is, the protective layer 74 is laminated on the surface of the conductive film heater 80 that faces the casing 41 of the accumulator 40.
  • the protective layer 74 is preferably a silicon sheet, for example.
  • the silicon sheet is flexible and more flexible than the resin substrate 91 that coats the conductive film heater 80. That is, the shape followability of the accumulator 40 to the casing 41 is improved by the silicon sheet.
  • a smooth surface layer 75 that contacts the casing 41 of the accumulator 40 is laminated on the conductive film heater 80.
  • the smooth surface layer 75 is laminated on the protective layer 74, for example.
  • the smooth surface layer 75 is a sheet member made of, for example, a polyimide sheet, and a material having a lower surface friction coefficient than the protective layer 74 is used.
  • the protective layer 74 and the smooth surface layer 75 are colored in different colors, before the conductive film heater 80 is exposed, the protective layer 74 of a different color is exposed from the torn portion of the smooth surface layer 75, and the worker is torn. It becomes possible to visually recognize the occurrence of. Accordingly, it is possible to take measures such as repairing the heating device 70 before further tearing proceeds.
  • a refrigerant recovery process using the heating device 70 according to the present embodiment will be described with reference to FIGS. 9 and 10.
  • a heating process using the heating device 70 is executed.
  • the refrigerant gas is sucked from the gas pipe service port 52 (see FIG. 1). Further, the refrigerant liquid is sucked from the liquid pipe service port 50. As the refrigerant gas is collected, the refrigerant circuit is depressurized. Accordingly, the accumulator 40 provided in the refrigerant circuit and adjacent to the gas pipe service port 52 is decompressed. Although the refrigerant liquid stored in the casing 41 is vaporized by this decompression, the heat in the casing 41 is taken away by the refrigerant gas as the heat of vaporization in the process of vaporizing the refrigerant liquid into the refrigerant gas.
  • the temperature in the casing 41 is lowered and the vaporization of the refrigerant liquid is delayed. Therefore, the stagnation of the vaporization of the refrigerant liquid is suppressed by heating the casing 41 using the heating device 70 according to the present embodiment.
  • FIG. 9 illustrates a flowchart of the refrigerant recovery process according to this embodiment.
  • the flowchart is executed by a refrigerant recovery operator, for example.
  • steps S16 and S18 correspond to the heating process according to the present embodiment.
  • the air conditioner 20 is stopped (S10). After a predetermined time has elapsed, the liquid tube charge hose 58 is connected to the liquid tube service port 50 (S12). Further, the gas pipe charge hose 60 is connected to the gas pipe service port 52 (S14).
  • the heating device 70 is attached to the casing 41 (S16). Since the refrigerant liquid is stored at the bottom inside the casing 41, the heating device 70 is attached to the hemispherical lower end of the casing 41. As described above, since the casing 41 is made of a magnetic material such as iron, the heating device 70 sticks to the lower end portion of the casing 41 (adsorption) by the magnet layer 73 laminated (backed) on the heating device 70. To do).
  • the accumulator 40 is installed at a slightly recessed position in the outdoor unit 22, and piping, wiring, etc. (not shown) are routed around it.
  • the heating device 70 is attached to the outer surface of the lower end of the casing 41 of the accumulator 40 so as to penetrate through these pipes and wires. Once the heating device 70 is attached to the casing 41, the heating device 70 is moved forward (moved along the Y-axis direction in FIG. 10).
  • the smooth surface layer 75 is provided on the contact surface of the heating device 70 with the casing 41, the heating device 70 can be smoothly slid on the outer surface of the casing 41.
  • the front end of the heating device 70 is the tip 72, when there are obstacles such as piping and wiring ahead of the traveling direction, after the tip 72 is once in contact with the obstacle, The direction of travel is changed to avoid this.
  • the heating device 70 is inserted into the outer surface of the casing 41 from the side that can be seen from the access side of the outdoor unit 22 to the back side that faces this and cannot be seen from the access side.
  • insertion is smoothly performed by changing the traveling direction so that the distal end portion 72 appropriately avoids an obstacle.
  • the plug 87 (see FIG. 7) at the end of the wiring 71 is inserted into the socket 89, whereby the conductive film is The heater 80 is heated (S18), and the casing 41 is heated accordingly. Further, when it is confirmed that the air conditioner 20 is in the operation stop state, the refrigerant recovery apparatus 100 is activated (S20), and the refrigerant is drawn out from the air conditioner 20.
  • the recovery operator refers to the gauge manifold 104 (see FIG. 1) and other instruments to determine whether or not the recovery amount of the coolant recovered in the coolant recovery container 102 has become a predetermined set value abnormality. (S22). If the collection amount is less than the set value, the collection operation is continued (S24). If the recovery amount is equal to or greater than the set value, the refrigerant recovery device 100 is stopped (S26). Further, the liquid tube charge hose 58 is removed from the liquid tube service port 50 (S28). Further, the gas pipe charge hose 60 is removed from the gas pipe service port 52 (S30).
  • Heating device 70 can be used in the refrigerant recovery process and the heating process shown in FIG. 9 as in the above embodiment. 11 to 13, the same elements as those in FIGS. 1 to 10 are denoted by the same reference numerals, and redundant description is omitted.
  • FIG. 11 illustrates a heating device 70 having the same angle as FIG. 4, that is, the magnet layer 73 side facing upward.
  • FIG. 12 is an exploded perspective view similar to FIG. 5, that is, an exploded perspective view in which each component of the heating device 70 is exploded at the angle of FIG. 11.
  • the magnet layer 73 is composed of a plurality of magnet layer segments 73A to 73H.
  • the magnet layer segments 73A to 73H are obtained by dividing (subdividing) the magnet sheet, and are juxtaposed in the axial length direction (A-axis direction in FIG. 11). Further, it is desirable that adjacent magnet layer segments are arranged with a predetermined interval.
  • the magnet layer 73 is composed of the plurality of magnet layer segments 73A to 73H, so that the heating device can be prevented from being detached from the accumulator 40 when the heating device 70 is attached to the accumulator 40, as will be described later. It becomes.
  • the magnet layer segments 73A to 73H are separated from each other along the axial direction. Such a spaced arrangement suppresses heat transfer between adjacent magnet layer segments. That is, even if any one of the magnet layer segments 73A to 73H is overheated, heat transfer to the other adjacent magnet layer segments is suppressed. As a result, a decrease in magnetic force due to a temperature increase in the other magnet layer segment is suppressed.
  • FIG. 13 shows an example when the heating device 70 shown in FIGS. 11 and 12 is used in the refrigerant recovery process and the heating process shown in FIG.
  • the heating device 70 is attached to the casing 41 of the accumulator 40. Thereafter, the tip 72 and other parts may be detached from the outer surface of the casing 41 in the course of the advancement of the heating device 70.
  • the magnet layer 73 includes a plurality of magnet layer segments 73A to 73H as illustrated in FIG. Therefore, for example, even if the tip 72 is detached from the outer surface of the casing 41, the separation of the magnet layer segment 73 ⁇ / b> G that is separated from the outer surface of the casing 41 is adsorbed to the casing 41.
  • ⁇ Electrically conductive film heater according to another example of this embodiment> 14 to 18 illustrate a conductive film heater 80 according to a first alternative example of the present embodiment.
  • the conductive film heater 80 can be used in the refrigerant recovery process and the heating process shown in FIG. 9 as in the above embodiment.
  • FIG. 14 the same elements as those in FIG. 7 are denoted by the same reference numerals, and redundant description will be omitted as appropriate.
  • the conductive film heater 80 illustrated in FIG. This abnormality detection is performed according to a current value I flowing through a circuit that supplies power to the conductive film 82 (that is, a supply circuit).
  • the supply circuit is a circuit that connects the commercial power supply 90 and the conductive film 82, and includes the commercial power supply 90, power lines 96 and 98, electrodes 81A and 81B, and the conductive film 82.
  • a circuit breaker 85, a converter 94, a current sensor 84, a control unit 86, and a thermostat 83 are connected to this supply circuit.
  • a circuit breaker 85 is provided on the power line 96 that connects the plug 87 and the electrode 81A.
  • a converter 94, a current sensor 84, and a control unit 86 are connected to the power line 96 so as to straddle the circuit breaker 85.
  • the circuit breaker 85 is a circuit breaker different from the thermostat 83 and is normally maintained in the connected state, but can be switched to the interrupted state in accordance with a command from the control unit 86.
  • the converter 94 is a so-called AC / DC converter, and converts an alternating current supplied from the commercial power supply 90 into a direct current.
  • the converter 94 may be, for example, a transformer type or switching type converter.
  • the current sensor 84 detects the value of the direct current converted by the converter 94.
  • the current value I detected by the current sensor 84 is transmitted to the control unit 86.
  • the controller 86 determines whether or not the conductive film 82 is abnormal based on the current flowing through the supply circuit, and suppresses or interrupts the power supply by the supply circuit when it is determined as abnormal.
  • the control unit 86 is connected to a supply circuit, that is, a circuit connecting the commercial power supply 90 and the conductive film 82, and power is supplied from the supply circuit. Therefore, if the power supply of the supply circuit is interrupted, the control unit 86 is stopped. As will be described later, based on such characteristics of the control unit 86, erroneous determination of the control unit 86 at the time of power interruption by the thermostat 83 can be avoided.
  • FIG. 15 illustrates the hardware configuration of the control unit 86.
  • the control unit 86 can be realized by, for example, a general-purpose hardware configuration that has existed before, and is configured by a computer, for example.
  • the computer connects an HDD controller 86D to which a CPU 86A, a RAM 86B, a ROM 86C, a hard disk drive (HDD) 86E are connected, and a network controller 86F provided as a communication means to an internal bus 86G. Configured.
  • the ROM 86C or the hard disk drive 86E as storage means stores a threshold current value Ith1, Ith2 described later and a program capable of executing a conductive film abnormality detection flow illustrated in FIG. By executing the program, a functional block as illustrated in FIG.
  • control unit 86 includes a current comparison unit 86H, a command unit 86I, and a threshold storage unit 86J. The operation of these functional units will be described with reference to FIGS.
  • FIG. 17 illustrates a time chart illustrating the abnormality detection process of the conductive film 82 by the control unit 86
  • FIG. 18 illustrates a flowchart illustrating the abnormality detection process.
  • whether or not the conductive film 82 is abnormal is determined based on the current value I of the supply circuit.
  • the conductive film heater 80 if a crack occurs in a part of the conductive film 82, the resistance increases as the entire conductive film 82 increases, and the current value I decreases. Therefore, the presence or absence of abnormality of the conductive film 82 is determined based on the decrease in the current value I.
  • a temperature change graph of the thermostat 83 is illustrated.
  • the thermostat 83 has a function of a detector that detects the temperature of the conductive film heater 80 and a circuit breaker that suppresses or cuts off the power supply by the supply circuit.
  • the horizontal axis represents time
  • the vertical axis represents the temperature of the thermostat 83, which is a representative value of the temperature of the conductive film heater 80.
  • the temperature Toff is an off temperature value at which the thermostat 83 switches from the connected state to the disconnected state
  • the temperature Ton is an on temperature value at which the thermostat 83 switches from the disconnected state to the connected state.
  • a time change graph of the current value I measured by the current sensor 84 is illustrated.
  • time is plotted on the horizontal axis and current value [A] is plotted on the vertical axis.
  • the horizontal axis (time axis) is synchronized with the horizontal axis in the upper part of FIG.
  • the current value Ith1 is a first threshold value for determining that the conductive film 82 is abnormal.
  • an on / off time change graph of the control unit 86 is illustrated.
  • time is plotted on the horizontal axis and on / off of the control unit 86 is plotted on the vertical axis.
  • the horizontal axis (time axis) is synchronized with the upper and middle horizontal axes in FIG.
  • control unit 86 determines that the conductive film 82 has an abnormality. To do. Further, the control unit 86 outputs a cutoff command to the circuit breaker 85 to suppress or cut off the power supply of the supply circuit (time t5).
  • the power supply to the control unit 86 is also cut off at the same time as the thermostat 83 is cut off. Therefore, the control unit 86 is connected to the thermostat 83, that is, a period during which power is supplied from the supply circuit. Only when the conductive film 82 is abnormal. In other words, when the thermostat 83 is cut off and power is not supplied to the supply circuit, the abnormality determination by the control unit 86 is interrupted. As a result, when the current value I drops due to interruption of the thermostat 83, the control unit 86 (not supplied with power) does not determine that an abnormality has occurred in the conductive film 82, and erroneous determination is prevented.
  • FIG. 18 illustrates a flow of the abnormality detection. This flow is executed when power is supplied from the supply circuit, and is interrupted every time the power supply is cut off. When the power supply is resumed, the flow is executed from the start point (Start).
  • the current comparison unit 86H of the control unit 86 acquires the current value I sent from the current sensor 84, acquires the first threshold value Ith1 from the threshold storage unit 86J, and compares the two (S40).
  • the current comparison unit 86H continues to monitor the current value I without transmitting a signal to the command unit 86I (S42). On the other hand, when the current value I is less than the first threshold value Ith1, the current comparison unit 86H transmits a signal to that effect to the command unit 86I.
  • the command unit 86I When the command unit 86I receives the signal from the current comparison unit 86H, the command unit 86I outputs an operation signal to the circuit breaker 85 to switch from the connected state to the disconnected state (S44).
  • FIG. 19 and 20 illustrate a conductive film heater 80 according to a second example of the present embodiment.
  • the thermostat 83 is omitted as a difference from FIG.
  • the same elements as those in FIG. 14 are denoted by the same reference numerals, and redundant description will be omitted as appropriate.
  • the control unit 86 constantly monitors the current value I detected by the current sensor 84 until the plug 87 is inserted into the socket 89 and then pulled out or until the circuit breaker 85 is driven to be cut off halfway through. It is possible.
  • FIG. 20 illustrates a time chart in the abnormality detection process of the conductive film 82 by the control unit 86 according to the second example.
  • the flowchart in FIG. 18 is used as the flowchart in this process.
  • the flowchart according to FIG. 18 is executed when power is supplied from the supply circuit.
  • the control unit 86 performs the flow shown in FIG. 18 until the insertion plug 87 is inserted into the socket 89 and then pulled out or until the circuit breaker 85 is driven to be cut off in the middle (S44). Specifically, a loop between step S40 and step S42 can be continuously executed.
  • the conductive film 82 is in a normal state, that is, a state in which no crack is generated. Further, after time t11, the conductive film 82 is cracked and gradually enlarged, so that the current value I detected by the current sensor 84 gradually decreases. For example, the deterioration progresses due to the concentration of electric power around the first crack, and the crack is enlarged. Further, at time t12, when the current comparison unit 86H (see FIG. 16) determines that the current value I is less than the first threshold value Ith1 (S40 in FIG.
  • the command unit 86I causes the circuit breaker 85 to On the other hand, an operation signal for switching from the connected state to the blocked state is output (S44). Thereby, the power supply by the supply circuit connecting the commercial power supply 90 and the conductive film 82 is suppressed or cut off.
  • FIG. 21 to 23 illustrate a conductive film heater 80 according to a third modification of the present embodiment.
  • the control unit 86 connects the supply circuit, that is, the commercial power supply 90 and the conductive film 82, and includes the thermostat 83 and the circuit breaker 85. Power is supplied from different circuits.
  • the same elements as those in FIG. 14 are denoted by the same reference numerals, and redundant description will be omitted as appropriate.
  • the control unit 86 is connected to a power line 97 branched from the power line 96 and connected to the power line 98. As shown in FIG. 21, no device other than the control unit 86 is connected to the power line 97, and the control unit 86 is provided in a circuit different from the circuit breaker 85 and the thermostat 83.
  • the control unit 86 can monitor the current of the supply circuit even when the thermostat 83 is in the cut-off state and the breaker 85 is in the cut-off state. Therefore, in order to separate the current drop caused by the interruption of the thermostat 83 and the current drop caused by the abnormality in the conductive film 82, the second threshold value Ith2 as illustrated in FIG. 22 is used.
  • FIG. 22 is an example of a thermostat temperature change graph.
  • the graph is the same as the upper part of FIG.
  • the lower part of FIG. 22 illustrates a time change graph of the current value I measured by the current sensor 84 and received by the control unit 86.
  • time is plotted on the horizontal axis and current value [A] is plotted on the vertical axis.
  • the horizontal axis (time axis) is synchronized with the horizontal axis in the upper part of FIG.
  • a second threshold value Ith2 is determined for the vertical axis (current axis).
  • the second threshold value Ith2 is a threshold value for separating the current drop due to the interruption of the thermostat 83 and the current drop due to the occurrence of an abnormality in the conductive film 82, and is a value that is less than the first threshold value Ith1 and exceeds 0A. Is set.
  • FIG. 23 illustrates a flowchart in the abnormality detection process of the conductive film 82 according to the present embodiment.
  • step S46 using the second threshold value Ith2 is inserted between step S40 and step S44.
  • the current comparison unit 86H of the control unit 86 acquires the current value I sent from the current sensor 84 and the first threshold Ith1 from the threshold storage unit 86J. Are compared (S40). As a result of this comparison, when the current value I is equal to or greater than the first threshold value Ith1, the current comparison unit 86H continues to monitor the current value I without transmitting a signal to the command unit 86I (S42).
  • the current comparison unit 86H When the current value I is less than the first threshold value Ith1 at time t21, the current comparison unit 86H further determines whether or not the current value I exceeds the second threshold value Ith2 (S46). If the current value I is equal to or less than the second threshold value Ith2, the current comparison unit 86H continues to monitor the current value I without transmitting a signal to the command unit 86I (S42).
  • a loop composed of steps S40 and S42 (time t20 to t21, time t22 to t23) and a loop composed of steps S40, S46 and S42 (time t21 to t22, time t23 to t24) are repeated.
  • the command unit 86I An operation signal for switching from the connected state to the blocked state is output (S44). Thereby, the power supply by the supply circuit connecting the commercial power supply 90 and the conductive film 82 is suppressed or cut off.
  • the first threshold Ith1 and the second threshold Ith2 are used to determine whether the conductive film 82 is abnormal. Instead of the second threshold Ith2, a thermostat 83 is used.
  • the relay signal may be used.
  • the control unit 86 receives a relay signal from the thermostat 83.
  • the relay signal refers to a signal that becomes a predetermined positive voltage value when the thermostat 83 is in a connected state (on state), and becomes 0 [V] when in a cut-off state (off state).
  • the second threshold value Ith2 is used to determine whether the cause of the decrease in the current value I is due to the occurrence of an abnormality in the conductive film 82 or the interruption of the thermostat 83.
  • this may be replaced with a relay signal sent from the thermostat 83 to the control unit 86.
  • the control unit 86 determines that an abnormality such as a crack has occurred in the conductive film 82 and operates the circuit breaker 85. (S44).

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Air-Conditioning For Vehicles (AREA)

Abstract

L'invention concerne un dispositif de chauffage (70) qui est équipé d'un dispositif de chauffage à film conducteur (80) permettant de chauffer un accumulateur (40). Ainsi, il est possible de maintenir un effet de chauffage même si une partie d'un corps conducteur d'un dispositif de chauffage permettant de chauffer un accumulateur d'un dispositif de climatisation est endommagée.
PCT/JP2019/014011 2018-03-29 2019-03-29 Dispositif de chauffage, procédé de chauffage, et procédé de récupération de réfrigérant WO2019189767A1 (fr)

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