JP2012127328A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor that can improve a heating capacity of an air conditioning device, while suppressing the enlargement of the device.SOLUTION: An inlet port (3) which sucks a refrigerant into a box (2) is formed at one end of the box (2) which is possessed by the compressor, and a discharge port (5) which discharges the refrigerant sucked through the inlet port (3) to the outside of the box (2) is formed at the other end of the box (2). The compressor comprises: a compression mechanism (20) which is accommodated in the box (2), and compresses the refrigerant which is sucked into the box (2); an electric motor (10) which is arranged in the vicinity of the inlet port (3) rather than the compression mechanism (20) in the box (2), and provides the compression mechanism (20) with power; and a heating part (30) which is arranged in a space in which the refrigerant between the electric motor (10) and the compression mechanism (20) passes in the box (2), and heats the refrigerant.

Description

  The present invention relates to an electric compressor.

  Conventionally, in a vehicle air conditioner, a heat pump system has been used to cool the passenger compartment, and on the other hand, in order to heat the passenger compartment, a heater core that circulates and supplies cooling water of a radiator heated by the engine has been used. ing. However, in recent years, vehicles that use a motor as power, such as electric vehicles, fuel cell vehicles, and hybrid vehicles that use both an engine and a motor as power, have been researched and developed. In automobiles that use such motors, there is no cooling water for the engine, or even if an engine is installed, the cooling water is not sufficiently warmed because the engine is stopped during driving. There is. Therefore, the air conditioner cannot warm the conditioned air supplied to the vehicle interior using the heater core. Thus, it has been studied to use a heat pump system used for cooling for heating.

  However, the heating capacity of the heat pump system used in the vehicle air conditioner may not be able to sufficiently heat the vehicle interior in a very low temperature environment, for example, in an environment where the outside air temperature is -20 ° C. or lower. In particular, when HFC134a or HFO1234Yf, which is an alternative chlorofluorocarbon, is used as the refrigerant, the heating capacity of the heat pump system tends to be insufficient in a cryogenic environment.

  Therefore, between the refrigerant outlet of the vehicle interior evaporator and the refrigerant suction port of the compressor, the refrigerant flowing from the vehicle interior is generated by using the heat generated by the built-in sheathed heater that is heated by power supply from the on-vehicle power supply. There has been proposed an air conditioner for an electric vehicle in which an evaporator outside the vehicle compartment is disposed and heat generated from a sheathed heater is transmitted to a refrigerant pipe through which the refrigerant flows (for example, see Patent Document 1).

JP-A-10-203148

  However, as described above, in order to provide the refrigerant heating component separately from the components of the existing heat pump system, it is necessary to secure an extra space for installing the refrigerant heating component. However, since the space available for installation of the air conditioner is limited in the vehicle, it is not desirable to increase the size of the air conditioner in this way. Moreover, the cost of an air conditioner will also become high by providing separately the components for refrigerant | coolant heating.

  Then, the objective of this invention is providing the compressor which can improve the heating capability of an air conditioner, suppressing the enlargement of an apparatus.

According to the first aspect of the present invention, a compressor is provided as one aspect of the present invention. A suction port (3) for sucking refrigerant into the housing (2) is provided at one end of the housing (2) of the compressor, and the other end of the housing (2) is passed through the suction port (3). A discharge part (5) for discharging the sucked refrigerant to the outside of the housing (2) is provided. The compressor is housed in the housing (2) and compresses the refrigerant sucked into the housing (2), and the compressor (20) has a compression mechanism (20) that is more compact than the compression mechanism (20). An electric motor part (10) disposed near the suction port (3) and providing power to the compression mechanism part (20), and between the electric motor part (10) and the compression mechanism part (20) in the housing (2) And a heating section (30) for heating the refrigerant.
By having such a configuration, this compressor can improve the heating capacity of the air conditioner while suppressing an increase in size of the apparatus.

According to the second aspect of the present invention, the compressor is disposed closer to the suction port (3) than the heating unit (30) and close to the outer wall of the housing (2), and the heating unit (30) and It is preferable to further have a control part (40, 70) which controls an electric motor part (10).
By having such a configuration, this compressor can cool the control unit with the refrigerant before being heated by the heating unit.

Further, according to the third aspect, the electric motor section (10) interacts with the stator (11) that generates a magnetic field according to the supplied power and the magnetic field generated by the stator (11). It has a rotating rotor (13), and the heating unit (30) preferably generates heat according to the supplied power. And a control part (40,70) is between the positive electrode side bus line (54) connected with the positive electrode of DC power supply (47), and the negative electrode side bus line (55) connected with the negative electrode of DC power supply (47). An electric motor drive circuit (41) that is connected and converts the DC power supplied from the DC power source (47) into AC power and supplies the AC power to the stator (11) to drive the motor unit (10); A heating unit drive circuit (42, 72) for supplying DC power supplied from the DC power source (47) to the heating unit (30) via the positive side bus (54) or stopping the supply of the DC power; The motor drive circuit (41) is controlled so that AC power for rotating the rotor (13) at a predetermined target rotational speed is supplied to the stator (11), and the heating unit (30) is controlled per unit time. In a predetermined cycle so as to generate a predetermined calorific value. DC power only during a period in a proportion having a control circuit for controlling the heating unit drive circuit (42, 72) so as to supply to the heating unit (30) (46).
As a result, this compressor can use one DC power source for driving the electric motor and supplying power to the heating unit, and can control both the driving circuit of the electric motor and the driving circuit of the heating unit with one control circuit. Therefore, the number of parts of the circuit of the control unit can be reduced.

  In addition, the code | symbol in the parenthesis attached | subjected to each said means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

It is a schematic structure figure of a compressor by one embodiment of the present invention. It is a circuit diagram of the control circuit of a compressor. FIG. 6 is a circuit diagram of a compressor control circuit according to another embodiment. It is a schematic block diagram of the vehicle-mounted air conditioner provided with the compressor by embodiment of this invention.

  Hereinafter, a compressor for an air conditioner according to an embodiment of the present invention will be described in detail with reference to the drawings. This compressor has a heater disposed in a space in which the refrigerant flows from an inlet for sucking the refrigerant into the compressor to an outlet for discharging the refrigerant. Improve the heating capacity of the device. Further, this compressor suppresses an increase in the number of parts by sharing a part of the heater drive circuit with the motor drive circuit of the compressor.

  FIG. 1 shows a schematic cross-sectional view of a compressor according to one embodiment of the present invention. The compressor 1 according to the present embodiment is a scroll compressor, and is provided outside the housing 2, the electric motor unit 10 provided in the housing 2, the compression mechanism unit 20, the heater 30, and the housing 2. And a control board 40.

  The housing 2 is a substantially cylindrical casing, and seals the refrigerant flowing into the interior by end walls 2a and 2b provided at both ends and a substantially cylindrical side wall 2c. In the vicinity of the end wall 2a, a suction port 3 for sucking the refrigerant recirculated from the heat pump circuit into the housing 2 is provided. The compressor 1 operates the compression mechanism 20 to make the housing 2 have an intake pressure atmosphere, and sucks the refrigerant into the housing 2 through the suction port 3. The refrigerant flowing into the housing 2 through the suction port 3 flows to the compression mechanism unit 20 through a space between the electric motor unit 10 and the side wall 2c of the housing 2.

The motor unit 10 is, for example, a three-phase AC induction motor or a three-phase AC synchronous motor. The stator 11 disposed on the inner wall of the housing 2 and the center of the side wall 2c in the inner space of the housing 2 surrounded by the stator 11 The rotating shaft 12 is disposed along the axis z, and the rotor 13 is fixedly attached to the rotating shaft 12.
One end of the rotary shaft 12 is rotatably supported by a main bearing 14 provided on the end wall 2a, while the rotary shaft 12 is provided with a bearing 15 provided near the other end of the rotary shaft 12. 12 is rotatably supported. The bearing 15 is supported between the rotor 13 and the compression mechanism portion 20 by a bearing support portion 16 whose periphery is fixed to the side wall 2 c of the housing 2. An oil return pipe 12a is formed at the center of the rotary shaft 12 for returning the oil that has flowed to the compression mechanism 20 side together with the refrigerant to the suction port 3 side.

The stator 11 of the electric motor unit 10 is formed of, for example, an electromagnet having a coil, and generates a magnetic field that varies according to a drive signal from a control board 40 described later. Thereby, the rotating shaft 12 rotates with the rotational speed according to a drive signal by the interaction of the magnetic field between the rotor 13 which has a permanent magnet, and the stator 11. FIG.
In addition, in order to ensure the space which arrange | positions the heater 30 mentioned later, the coil which the stator 11 has was along the rotating shaft 12 direction so that the length of the electric motor part 10 along the center axis z direction might become short. It is preferable that the coil end is configured by concentrated winding that can shorten the length of the coil end.

  Furthermore, an eccentric portion 12b that is eccentric with respect to the rotation center of the rotary shaft 12 is provided at the end of the rotary shaft 12 on the compression mechanism portion 20 side, and the compression mechanism portion 20 is configured by the eccentric portion 12b. The movable scroll 21 is fixed. Therefore, the movable scroll 21 is rotated by the rotation of the rotating shaft 12. A balancer 17 is attached to the end of the rotary shaft 12 on the compression mechanism portion 20 side so as to balance the movable scroll 21 with a weight so that the rotary shaft 12 is not eccentric.

The compression mechanism unit 20 includes the above-described movable scroll 21 and the fixed scroll 22 disposed so as to face the movable scroll 21.
The movable scroll 21 is provided on a substantially disc-shaped substrate 21a disposed so as to be substantially orthogonal to the rotary shaft 12, and a surface of the substrate 21a on the fixed scroll 22 side, is substantially orthogonal to the substrate 21a, and has an involute curve shape. It has a movable spiral plate 21b formed and a boss portion 21c provided on the surface of the substrate 21a on the electric motor 10 side. And the eccentric part 12b of the rotating shaft 12 is fitted by the boss | hub part 21c.

  On the other hand, the fixed scroll 22 is a fixed side formed by a substantially disc-shaped substrate 22a disposed so as to be substantially orthogonal to the rotating shaft 12, and a spiral groove provided on the movable scroll 21 side surface of the substrate 22a. A spiral groove 22b is provided. The movable scroll 21 and the fixed scroll 22 are arranged to face each other so that the movable side spiral plate 21b and the fixed side spiral groove 22b are engaged with each other, thereby forming a plurality of working chambers 23.

  In the space for accommodating the movable scroll 21 formed by the outermost peripheral edge portion 22 c of the fixed scroll 22, the rotation of the movable scroll 21 is in the space facing the inner side surface of the fixed scroll 22 on the outer edge side of the movable scroll 21. An Oldham ring may be interposed as a means for preventing rotation. Thereby, only the revolution of the movable scroll 21 is permitted.

  Since the movable scroll 21 is fixed to the eccentric portion 12b of the rotating shaft 12 as described above, when the rotating shaft 12 rotates, the movable scroll 21 is formed by meshing between the movable spiral plate 21b and the fixed spiral groove 22b. The volume of the plurality of working chambers 23 is reduced. Thereby, the compression mechanism part 20 compresses the refrigerant | coolant supplied to the suction chamber (not shown) connected to the outermost periphery side of the fixed side spiral groove 22b.

Further, a discharge port 22d penetrating the substrate 22a in the axial direction is provided at the center of the substrate 22a of the fixed scroll 22 of the compression mechanism unit 20.
The refrigerant compressed by the movable scroll 21 and the fixed scroll 22 is discharged from the discharge port 22d into the discharge chamber 4 through the discharge valve 24 for preventing backflow. Then, the refrigerant flows from the discharge chamber 4 toward the outside of the housing 2 into the oil / refrigerant separation device 5 formed so as to penetrate the housing 2.
The oil / refrigerant separation device 5 serving as a discharge unit separates the oil flowing in together with the refrigerant, supplies the refrigerant to the heat pump circuit, and returns the oil to the discharge chamber 4. After passing through the filter 6 provided in the discharge chamber 4, the oil is returned to the motor unit 10 side through an oil return port 22 e formed in the outer peripheral portion of the fixed scroll 22. The filter 6 removes impurities such as debris or dust from the oil flowing into the oil return port 22e.

The heater 30 which is a heating unit is installed in a space through which the refrigerant passes between the stator 11 of the electric motor unit 10 and the compression mechanism unit 20. For example, the heater 30 has a sheathed heater formed in an arc shape along the inner periphery of the side wall 2 c of the housing 2. Note that the heater 30 may have another heating element that generates heat by electric power and is suitable for heating the gas. The heater 30 generates heat according to the power supplied from the control board 40 and heats the refrigerant flowing from the electric motor unit 10 toward the compression mechanism unit 20.
Thus, since the heater 30 is installed in the space without the structure in the housing 2, the size of the compressor 1 can be made comparable with the size of the compressor by the prior art which does not have a heater. .

  The control board 40 controls the electric motor unit 10 and the heater 30 according to a control signal from a control circuit (not shown) of the in-vehicle air conditioner. In the present embodiment, the control board 40 is disposed close to the outside of the end wall 2a so that the circuit elements on the control board 40 are cooled by the refrigerant flowing into the housing 2.

  FIG. 2 is a circuit diagram of a drive circuit included in the control board 40. As shown in FIG. 2, the control board 40 includes an electric motor drive circuit 41, a heater drive circuit 42, a capacitor 43, a current sensor 44, a communication circuit 45, and a control circuit 46.

The motor drive circuit 41 is configured as an inverter circuit, converts DC power supplied from the DC power supply 47 into three-phase AC power according to a control signal input from the control circuit 46, and converts the three-phase AC power into the motor unit 10. Are output to the star-connected coils L _{1 to} L ₃ . Therefore, the motor drive circuit 41 is configured as an inverter circuit, and includes three sets of arms 51 corresponding to the U-phase coil L ₁ , W-phase coil L ₂ , and V-phase coil L ₃ of the motor unit 10, respectively. 52, 53. These arms 51, 52 and 53 are connected in parallel to the DC power supply 47. The arm 51 has switching elements SW1 and SW4 connected in series. Similarly, the arms 52 and 53 have switching elements SW2 and SW5 and SW3 and SW6 connected in series, respectively. Here, for convenience, the switching elements SW1 to SW3 are referred to as upper switching elements, and the switching elements SW4 to SW6 are referred to as lower switching elements.

  Each of the switching elements SW1 to SW6 includes, for example, a transistor and a diode connected in parallel with the transistor so that a current flows in a direction opposite to the direction in which the current flows through the transistor (for example, an emitter terminal and a diode of an NPN transistor) The anode terminal of the transistor is connected, and the collector terminal of the transistor and the cathode terminal of the diode are connected). As a transistor included in the switching element, for example, an insulated gate bipolar transistor (IGBT) or a power MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) can be used. Each of the switching elements SW1 to SW6 may have another configuration that can be switched on and off in accordance with the rotational speed of the rotor 13 of the electric motor unit 10.

In addition, with respect to the arm 51, one end of the switching element SW <b> 1 (on the cathode terminal side of the diode) is connected to the positive side bus 54 of the electric motor drive circuit 41. The other end of the switching element SW1, i.e., the midpoint T1 of the switching elements SW1 and SW4 are connected to one end of the U-phase coil L ₁ of the motor unit 10. One end of the switching element SW4 (on the anode terminal side of the diode) is connected to the negative-side bus 55. Similarly, with respect to the arm 52, one end of the switching element SW2 is connected to the positive-side bus 54 of the motor drive circuit 41. On the other hand, the midpoint T2 of the switching element SW2 and SW5 is connected to one end of the W-phase terminal coil L ₂ of the motor unit 10. One end of switching element SW5 is connected to negative electrode side bus 55. Further, with respect to arm 53, one end of switching element SW3 is connected to positive-side bus 54. On the other hand, the midpoint T3 of the switching elements SW3 and SW6 is connected to one end of the V-phase coil L ₃ of the motor unit 10. One end of switching element SW6 is connected to negative electrode side bus 55.

  Each of the switching elements SW1 to SW6 is switched on or off by a control signal from the control circuit 46. And, for example, when the upper switching element of any one arm and the lower switching element of the other arm are turned on and the other switching elements are turned off, a current flows through the motor unit 10 and the rotor 13 Rotate. Then, the switching elements that are turned on are sequentially switched for each arm, so that the rotor 13 rotates stably at the instructed speed.

  The heater drive circuit 42 is connected in parallel with the motor drive circuit 41 between the positive side bus 54 and the negative side bus 55. The heater drive circuit 42 is connected between the switching element SW7 connected between the positive-side bus 54 and one end of the heater 30 and the negative-side bus 55 and one end of the heater 30. Switching element SW8. That is, the switching element SW7, the heating element of the heater 30, and the switching element SW8 are connected in series between the positive side bus 54 and the negative side bus 55. Note that the switching elements SW7 and SW8 can have the same configuration as the switching elements SW1 to SW6, respectively.

  The switching elements SW7 and SW8 are turned on or off by a control signal from the control circuit 46. When both of the switching elements SW7 and SW8 are on, the DC power from the DC power supply 47 is supplied to the heater 30. On the other hand, if either one of the switching elements SW7 and SW8 is off, The supply of DC power is stopped.

Capacitor 43 is connected between positive side bus 54 and negative side bus 55 in parallel with DC power supply 47. The positive electrode of the DC power supply 47 is connected to the positive electrode bus 54, and the negative electrode of the DC power supply 47 is connected to the negative electrode bus 55. DC power supply 47 outputs a power supply voltage to positive-side bus 54. Capacitor 43 stabilizes the voltage output from DC power supply 47 to positive side bus 54.
The capacitor 43 can be, for example, an electrolytic capacitor, a film capacitor, or a ceramic capacitor.
As the DC power supply 47, various power supplies that supply DC power can be used. For example, as the DC power supply 47, a lead storage battery, a lithium ion battery, a nickel hydrogen battery, or a fuel cell can be used.

Current sensor 44 detects a current flowing through negative electrode side bus 55. The current flowing through the negative electrode side bus 55 is the sum of the W-phase current, the V-phase current, and the U-phase current. U-phase current is the current flowing from the midpoint T1 to the U-phase coil L ₁ of the stator 11. W-phase current is the current flowing from the midpoint T2 to the W-phase coil L ₂ of the stator 11. V-phase current is the current flowing from the midpoint T3 to the V-phase coil L ₃ of the stator 11.
The current sensor 44 notifies the control circuit 46 of the detected current value.

  The communication circuit 45 is connected to the electronic control device 60 of the air conditioner via a signal line, receives control signals such as the target rotational speed and heater 30 on / off from the electronic control device 60, and receives the received signals as a control circuit. Pass to 46.

The control circuit 46 includes a processor, a memory, and its peripheral circuits, and controls the motor unit 10 and the heater 30 by executing a computer program for controlling the motor unit 10 and the heater 30 stored in the memory. .
For example, the control circuit 46 turns on / off each switching element of the motor drive circuit 41 based on the detection value of the current sensor 44 and the target rotational speed received from the electronic control device 60 of the air conditioner via the communication circuit 45. Control timing.

The control circuit 46 also has a heater driving circuit based on a control signal for turning on or off the heater 30 received from the electronic control unit 60 via the communication circuit 45 and a control signal representing a target heat generation amount per unit time of the heater 30. The on / off timing of each switching element 42 is controlled.
Therefore, for example, when the heater 30 warms the refrigerant, the control circuit 46 turns on the switching element SW7. In addition, the control circuit 46 controls the ratio of the period during which the switching element SW8 is turned on during a predetermined period, that is, the period during which power is supplied to the heater 30 in the predetermined period by the pulse width modulation (PWM) method. Thus, the amount of heat generated by the heater 30 per unit time is controlled. Therefore, the control circuit 46 lengthens the period during which the switching element SW8 is turned on as the heat generation amount per unit time of the heater 30 is increased. Note that a reference table representing the relationship between the length of the period during which the switching element SW8 is turned on during the predetermined period and the amount of heat generated per unit time of the heater 30 is stored in advance in the memory included in the control circuit 46. When notified of the target heat generation amount from the electronic control unit 60, the control circuit 46 refers to the reference table to determine a period during which the switching element SW8 corresponding to the target heat generation amount is turned on.

Further, when there is a possibility that the positive electrode bus 54 and the negative electrode bus 55 are short-circuited, for example, when the switching element SW8 fails, the control circuit 46 turns off the switching element SW7 to thereby turn off the positive electrode bus. 54 and the negative electrode side bus 55 are prevented from being short-circuited.
Further, the control circuit 46 switches on / off of the heater 30 depending on whether or not the switching element SW8 is turned on, and controls the switching element SW7 by the PWM method, thereby controlling the heat generation amount per unit time of the heater 30. May be.

  In this way, the motor drive circuit 41 and the heater drive circuit 42 use a common control circuit, and these circuits are configured to supply power to both the motor drive circuit 41 and the heater drive circuit 42 from one power source. By configuring this, the number of component parts of the circuit of the compressor 1 can be reduced.

  FIG. 3 is a circuit diagram of a control board 70 according to a modification. In FIG. 3, each component of the control board 70 is assigned the same reference number as that of the corresponding component of the control board 40 shown in FIG. 2. 3 is different from the control board 40 shown in FIG. 2 in the configuration of the heater drive circuit 72.

  The heater drive circuit 72 has one switching element SW9 connected between the positive-side bus 54 and one end of the heating element of the heater 30. The other end of the heating element of the heater 30 is connected to the intermediate point T1 of the U-phase arm of the electric motor drive circuit 41. That is, the switching element SW9 and the heating element of the heater 30 are connected in series between the positive-side bus 54 and the intermediate point T1. The switching element SW9 can have the same configuration as the switching elements SW1 to SW6.

The switching element SW9 is turned on or off by a control signal from the control circuit 46. For example, when the heater 30 warms the refrigerant, the control circuit 46 controls the amount of heat generated per unit time of the heater 30 by controlling the period during which the switching element SW9 is turned on during a predetermined period by the PWM method.
By configuring the heater drive circuit in this way, the number of switching elements included in the heater drive circuit becomes one, so that the number of parts on the control board of the compressor can be further reduced.
The other end of the heating element of the heater 30 only needs to be connected to the intermediate point of any one phase arm, for example, the intermediate point T2 of the W phase or the intermediate point T3 of the V phase. Good.
Further, the connection order of the heating element of the heater 30 and the switching element SW9 may be switched. Furthermore, one end of the switching element SW9 may be connected to the negative electrode bus 55 instead of being connected to the positive electrode bus 54.

In FIG. 4, the schematic block diagram of the vehicle-mounted air conditioner 100 which has a compressor by said embodiment is shown. The in-vehicle air conditioner 100 includes a heat pump circuit 101 and an electronic control device 110. The heat pump circuit 101 includes a compressor 102, a condenser 103, a receiver 104, an expansion valve 105, an evaporator 106, and a four-way valve 107.
The compressor 102 is a compressor according to the above-described embodiment, and compresses the refrigerant into a high-temperature and high-pressure gas. The refrigerant flows through the heat pump circuit 101 during cooling as described below.
The gaseous refrigerant flows into the condenser 103 through the four-way valve 107. The condenser 103 cools and liquefies the high-temperature and high-pressure refrigerant gas sent from the compressor 102. The receiver 104 stores the liquefied refrigerant gas. Further, in order to prevent the cooling performance from being deteriorated, gaseous bubbles contained in the liquefied refrigerant are removed, and only the completely liquefied refrigerant is sent to the expansion valve 105. The expansion valve 105 adiabatically expands the liquefied refrigerant to lower the temperature and pressure, and sends the refrigerant to the evaporator 106. The evaporator 106 performs heat exchange between the low-temperature and low-pressure refrigerant and the air sent to the evaporator 106 by a blower fan (not shown) and cools the air. The cooled air is blown out into the passenger compartment and cools the passenger compartment. On the other hand, the refrigerant warmed by the heat exchange in the evaporator 106 flows into the compressor 102 again.

  During heating, the four-way valve 107 is switched by control from the electronic control unit 110, and the refrigerant flows along a route indicated by a dotted line in FIG. That is, the gaseous refrigerant discharged from the compressor 102 is guided to the evaporator 106 via the four-way valve 107, and the refrigerant from the condenser 103 is guided to the compressor 102 via the four-way valve 107. Then, the high-temperature and high-pressure refrigerant warms the air introduced into the passenger compartment in the evaporator 106.

  The electronic control unit (air conditioning ECU) 110 includes an embedded microprocessor, a memory, a communication circuit, and its peripheral circuits. The electronic control unit 110 controls the operation of each part of the air conditioner including the compressor 102 according to the target room temperature, the detected room temperature, and the like by a program that runs on the microprocessor. The electronic control unit 110 transmits a control signal for turning off the heater included in the compressor 102 to the compressor 102 during cooling. In addition, the electronic control unit 110 transmits a control signal for turning on the heater of the compressor 102 and a control signal for instructing a heat generation amount per unit time to the compressor 102 during heating.

  As described above, the compressor according to the present invention improves the heating capacity while preventing the compressor from becoming large by installing the heater at a position that does not interfere with the electric motor and the compression mechanism in the housing. it can. In addition, this compressor can reduce the number of parts by sharing a part of the circuit for controlling the electric motor and the circuit for controlling the heater.

The embodiments described above are for explaining the present invention, and the present invention is not limited to these embodiments. For example, any of various inverter-type motor drive circuits may be applied as the motor drive circuit included in the control board. For example, a step-up / step-down circuit for stepping up or stepping down a voltage supplied from a direct-current power source between a direct-current power source and a capacitor, and a positive side bus and a negative side bus, and a positive side between the step-up / down circuit and the motor drive circuit A voltmeter may be provided that measures the voltage between the bus and the negative-side bus and notifies the control circuit of the voltage value. In this case, the control circuit controls the step-up / step-down circuit and the motor drive circuit according to the current flowing through the negative-side bus, the voltage between the positive-side bus and the negative-side bus, and the target rotational speed of the motor unit. Such a booster circuit is well known as disclosed in, for example, Japanese Patent Application Laid-Open No. 2010-268627, and a detailed description thereof will be omitted.
In addition, the control board is not limited to the position close to the end wall on the suction port side, but is positioned closer to the suction port than the heater and close to the outer wall such as the end wall or side wall of the housing. May be.

  As described above, those skilled in the art can make various modifications within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Compressor 2 Housing 2a, 2b End wall 2c Side wall 3 Intake port 4 Discharge chamber 5 Oil / refrigerant separation device 6 Filter 10 Electric motor part 11 Stator 12 Rotating shaft 13 Rotor 14 Main bearing 15 Bearing 16 Bearing support part 17 Balancer 12a Oil return pipe 12b Eccentric part 20 Compression mechanism part 21 Movable scroll 21a Substrate 21b Movable side spiral plate 21c Boss part 22 Fixed scroll 22a Substrate 22b Fixed side spiral groove 22c Outer peripheral edge part 22d Discharge port 22e Oil return port 23 Working chamber 24 Discharge valve 30 Heater 40, 70 Control board 41 Motor drive circuit 42, 72 Heater drive circuit 43 Capacitor 44 Current sensor 45 Communication circuit 46 Control circuit 47 DC power supply 51-53 Arm 54 Positive electrode side bus 55 Negative electrode side bus
SW1 to SW9 Switching element 60 Electronic control unit 100 On-vehicle air conditioner 101 Heat pump circuit 102 Compressor 103 Condenser 104 Receiver 105 Expansion valve 106 Evaporator 107 Four-way valve 110 Electronic control unit

Claims (3)

A housing (2) provided at one end of the housing (2), provided at an inlet (3) for sucking refrigerant into the housing (2), and at the other end of the housing (2); A housing (2) having a discharge part (5) for discharging the refrigerant sucked through the suction port (3) to the outside of the housing (2);
A compression mechanism (20) for compressing the refrigerant contained in the housing (2) and sucked into the housing (2);
An electric motor section (10) disposed closer to the suction port (3) than the compression mechanism section (20) in the housing (2) and providing power to the compression mechanism section (20);
A heating unit (30) that is arranged in a space through which the refrigerant passes between the electric motor unit (10) and the compression mechanism unit (20) in the housing (2), and warms the refrigerant;
The compressor characterized by having.   It is arranged near the suction port (3) and closer to the outer wall of the housing (2) than the heating unit (30), and outputs a drive signal to the heating unit (30) and the electric motor unit (10). The compressor according to claim 1, further comprising a control unit (40, 70). The electric motor section (10) includes a stator (11) that generates a magnetic field according to supplied electric power, and a rotor (13) that rotates by interacting with the magnetic field generated by the stator (11). Have
The heating unit (30) generates heat according to the supplied power,
The control unit (40, 70)
Connected between a positive side bus (54) connected to the positive electrode of the DC power source (47) and a negative side bus (55) connected to the negative electrode of the DC power source (47), from the DC power source (47) An electric motor drive circuit (41) for driving the electric motor section (10) by converting the supplied direct current power into alternating current power and supplying the alternating current power to the stator (11);
A heating unit drive circuit (42, 72) that supplies DC power supplied from the DC power source (47) to the heating unit (30) via the positive bus (54) or stops supply of the DC power. )When,
Controlling the electric motor drive circuit (41) such that AC power for rotating the rotor (13) of the electric motor unit (10) at a predetermined target rotational speed is supplied to the electric motor unit (10), and The heating unit so that the DC power is supplied to the heating unit (30) only during a period that occupies a first ratio of a predetermined cycle so that the heating unit (30) generates a predetermined calorific value per unit time. A control circuit (46) for controlling the drive circuits (42, 72);
The compressor according to claim 2.

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