JP2021014817A - Refrigeration cycle device - Google Patents

Abstract

To prevent occurrence of leakage flow collision at intermediate positions of adjacent axial flow fans as the cause of increase in noise when using the axial flow fans in parallel.SOLUTION: Rotation is controlled so that the rotation directions of adjacent axial flow fans are opposite to each other and blades of an optional axial flow fan has and blades of the adjacent axial flow fan are in an alternate positional relation. As a result of this, leakage flow at the outer peripheral part of the optional axial flow fan alternately flow but do not occur any collision and thereby noise becomes smaller, and performance of a refrigeration cycle device is improved because air quantity in the same noise is increased.SELECTED DRAWING: Figure 5

Description

The present invention relates to a refrigeration cycle device that adjusts air temperature and water temperature using a refrigerant.

Conventionally, this type of refrigeration cycle device is mainly equipped with a heat exchanger that transfers heat between the outdoor air and the refrigerant filled in the device, and heat is generated by sending air to the heat exchanger. Promoting movement. The larger the air volume, the more heat is transferred. In order to increase the air volume, there are a method of increasing the rotation of the axial blower and a method of using the axial blower in parallel. Regarding the method of increasing the rotation speed, the forces applied to the axial blower are centrifugal force and aerodynamic force, both of which increase in proportion to the square of the rotation speed, so that it is extremely difficult to improve the strength. Therefore, it is often used in parallel. When used in parallel, the air volume increases, but if the rotation is in the same direction, the airflow collides with each other when the blades of the adjacent axial blowers pass each other, increasing noise. Therefore, a sound absorbing material may be provided in the flow path or adjacent. Noise was reduced by rotating the axial fan in the opposite direction. In addition, the performance of the refrigeration cycle apparatus has been improved by increasing the amount of air blown under the same noise condition (see, for example, Patent Document 1).

FIG. 21 shows the outdoor unit 22 of the conventional refrigeration cycle device described in the publication. The outdoor unit 22 is composed of a housing 63, an outdoor blower 61, and a plurality of blades 72 attached to the outdoor blower 61.

International Publication No. 2012/017481

However, in the conventional outdoor unit 22, the downstream side of the airflow from the outlet of the outdoor blower 61 is open to the atmosphere and the sound absorbing material cannot be attached, and the outdoor heat exchanger 41 is large in the housing and the sound absorbing material can be attached. It was necessary to reduce the generation of noise in the outdoor blower 61 because the effect was small and the effect was small. In the past, it was effective to rotate the adjacent outdoor blowers 61 in opposite directions, but in recent years, the housing 63 has become smaller and the distance between the outdoor blowers 61 has become narrower, so that the adjacent axial fan There is a problem that the collision of the leak flow at the intermediate position occurs and the noise increases on the contrary.

The present invention solves the conventional problems, and an object of the present invention is to provide a refrigeration cycle device in which the air blow noise of the outdoor unit 22 is reduced by further reducing the collision of the leak flow at the outer peripheral portion of the outdoor blower 61. And.

In order to solve the conventional problems, the refrigerating cycle apparatus of the present invention includes a blower having a plurality of axial flow fans and a bell mouth, and the axial flow fans are arranged adjacent to each other in a row, and the axial flow fan. Has multiple blades, the bellmouth surrounds the axial fan so that it partially overlaps in the axial direction of rotation, and the multiple axial fans rotate in opposite directions and are optional. This is a refrigeration cycle device in which the blades of the axial flow fan of the above are rotated while maintaining a positional relationship in which the blades of the adjacent axial flow fan are staggered with each other.

As a result, the blades are maintained at a predetermined distance or more, so that the collision of the airflow is further reduced. That is, the following changes occur. If the adjacent axial fan rotates only in the opposite direction, the blades will have no speed difference or a slight speed difference due to a predetermined rotation speed difference, but the minimum distance between the blades of the adjacent axial fans is narrow. , Leakage flow collides when the blades approach. On the other hand, the minimum distance of the blades is large by shifting the circumferential angle position of the blades so that the adjacent axial flow fans rotate in the opposite direction and maintain the positional relationship in which the blades are staggered. Therefore, the collision of airflow is further reduced.

Since the refrigeration cycle device of the present invention can reduce the collision of the leak flow at the intermediate position of the adjacent axial fan, it is possible to reduce the blowing noise depending on the rotation speed of the axial fan and the number of blades. Further, the amount of air blown can be increased under the same noise condition, and the amount of heat exchanged in the air-cooled heat exchanger can be increased, so that the performance of the refrigeration cycle apparatus can be improved.

Configuration diagram of the refrigeration cycle device according to the first embodiment of the present invention. Front view of the axial blower according to the first embodiment of the present invention. Configuration diagram of the electric motor according to the first embodiment of the present invention Waveform diagram of the comparator used for blower control in the second embodiment of the present invention Waveform diagram of the output signal of the electric motor according to the second embodiment of the present invention. Flow chart of control in Embodiment 2 of the present invention The figure which shows the combination of the hall sensor in Embodiment 3 of this invention The figure which shows the 1st example of the detail of the combination of Hall sensor in Embodiment 3 of this invention. The figure which shows the 2nd example of the detail of the combination of hall sensors in Embodiment 3 of this invention. The figure which shows the 3rd example of the detail of the combination of Hall sensor in Embodiment 3 of this invention. The figure which shows the 4th example of the detail of the combination of hall sensors in Embodiment 3 of this invention. The figure which shows the 5th example of the detail of the combination of Hall sensor in Embodiment 3 of this invention. The figure which shows the sixth example of the detail of the combination of hall sensors in Embodiment 3 of this invention. The figure which shows the 7th example of the detail of the combination of Hall sensor in Embodiment 3 of this invention. The figure which shows the 8th example of the detail of the combination of Hall sensor in Embodiment 3 of this invention. The figure which shows the 9th example of the detail of the combination of Hall sensor in Embodiment 3 of this invention. The figure which shows the tenth example of the detail of the combination of hall sensors in Embodiment 3 of this invention. The figure which shows the eleventh example of the details of the combination of hall sensors in Embodiment 3 of this invention. Flow chart of control in Embodiment 3 of the present invention Flow chart of control in Embodiment 4 of the present invention Front view of a conventional axial blower

The first invention includes a blower having a plurality of axial flow fans and a bell mouth, the axial flow fans are arranged adjacent to each other in a row, and the axial flow fan has a plurality of blades. The bell mouth surrounds the axial flow fans so as to partially overlap in the direction of the rotation axis, the plurality of axial flow fans rotate in opposite directions, and the blades of any axial flow fan are adjacent to each other. It is a refrigeration cycle device that rotates while maintaining a positional relationship that alternates with the blades of the flow fan. As a result, the blades are maintained at a predetermined distance or more, so that the collision of the airflow is further reduced, the ventilation noise can be reduced, and the performance of the refrigeration cycle device is improved under the same noise condition. be able to. That is, when adjacent axial fan rotates in the opposite direction, the blades have no speed difference or a slight speed difference due to a predetermined rotation speed difference, but the minimum distance between the blades of the adjacent axial fans. Since is narrow as in the case of rotating in the same direction, leakage flows collide when the blades approach each other. By shifting the inscribed angle positions of the blades so that the adjacent axial flow fans rotate in opposite directions and maintain the positional relationship in which the blades are staggered, the distance that the blades are closest to each other becomes large. Since the collision of the air flow can be further reduced and the collision of the leak flow at the intermediate position of the adjacent axial fan can be reduced, the blowing noise depending on the rotation speed of the axial fan and the number of blades can be reduced. Further, the amount of air blown can be increased under the same noise condition, and the amount of heat exchanged in the heat exchanger can be increased, so that the performance of the refrigeration cycle apparatus can be improved.

In the second invention, the blower uses a DC brushless electric motor as rotational power, the coil of the stator of the electric motor has three phases, and the rotation angle detection device utilizes the induced voltage generated in the coil of the stator of the electric motor. The refrigeration cycle device is characterized in that the position of the blades is corrected by using the output signal of the rotation angle detection device. As a result, by comparing the combination of each phase of the induced voltage generated in the motor, the blades of two adjacent axial-flow fans with three blades are required to have a staggered positional relationship. By clarifying the angle of rotation, it is not necessary to place a position detection device such as a hall sensor in a narrow part where the rotor and stator are intricate, and the manufacturing process is simplified and defects are reduced, so reliability can be improved. it can.

In the third invention, the blower uses the electric motor as the rotational power, uses one or more Hall sensors inside the electric motor as the rotation angle detection device, and uses the output signal of the rotation angle detection device to position the blades. It is a refrigeration cycle device characterized by performing the correction of. As a result, since the electric motor has a hall sensor, the rotation angle of the electric motor required to make the blades of two adjacent axial flow fans staggered is clarified, so that the height using an encoder or the like is used. Although it is accurate, it eliminates the need to use a motor, which is more expensive than a hall sensor, so the cost can be reduced.

In the fourth invention, the blower uses the electric motor as the rotational power, determines the reference position of the rotation angle by using the induced voltage of the electric motor, and corrects the position of the blade by using the output signal of the hall sensor. The refrigeration cycle device is characterized by this. The resolution of the rotation angle obtained by the induced voltage is low because it depends on the number of phases of the stator coil, and while the resolution of the Hall sensor is high, the signal is periodically repeated in one rotation depending on the number of poles of the rotor. The position during one rotation cannot be specified. On the other hand, the resolution is improved by first monitoring whether or not it is the reference position with the induced voltage and then detecting the rotation angle with the Hall sensor when it reaches the reference position, so it rotates at a high resolution at least once in one rotation. The angle can be detected. Therefore, it is possible to increase the combination of the number of blades of the axial fan and the specifications of the motor in which the blades are in a staggered positional relationship, and it is possible to reduce the collision of the leakage flow at the intermediate position of the adjacent axial fans. Blower noise can be reduced with various blowers.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the present embodiment.

(Embodiment 1) FIG. 1 shows a configuration diagram of a refrigeration cycle device according to a first embodiment of the present invention.

FIG. 2 shows a front view of the axial blower according to the first embodiment of the present invention.

In FIG. 1, the refrigeration cycle device 20 includes a main circuit 21, a compressor 30, an outdoor heat exchanger 41, an indoor heat exchanger 42, a four-way valve 50, an outdoor expansion valve 55, and an indoor expansion valve 56. , The refrigerant storage tank 57, the outdoor blower 61, and the indoor blower 62 are provided, and the outdoor heat exchanger 41 dissipates heat and the indoor heat exchanger 42 absorbs heat, or the outdoor heat exchanger 41 absorbs heat. The structure is such that the operation of dissipating heat by the indoor heat exchanger 42 can be switched. For example, a device that uses the refrigeration cycle device 20 for the purpose of heating or cooling air is called an air conditioner, and a device that uses the refrigeration cycle device 20 for the purpose of heating or cooling water is called a chiller.

Further, as a form of the refrigeration cycle device 20, an outdoor unit 22 including a compressor 30, an outdoor heat exchanger 41, a four-way valve 50, an outdoor expansion valve 55, a refrigerant storage tank 57, and an outdoor blower 61. The unit may be separated by the indoor unit 23 including the indoor heat exchanger 42, the indoor expansion valve 56, and the indoor blower 62, and the outdoor unit 22 and the indoor unit 23 may be configured. It may be configured as an integrated unit. Further, even in the configuration in which the outdoor unit 22 and the indoor unit 23 are separated, there are cases where the number of outdoor units 22 and indoor units 23 is the same, and cases where the number of indoor units 23 is larger than that of the outdoor unit 22.

In the present embodiment, the outdoor unit 22 and the indoor unit 23 are separated, which is often seen in home air conditioners and store air conditioners, and the outdoor unit 22 and the indoor unit 23 are one each. Shown.

When the main circuit 21 dissipates heat in the outdoor heat exchanger 41 and absorbs heat in the indoor heat exchanger 42, the compressor 30, the first path 51 of the four-way valve 50, the outdoor heat exchanger 41, and the outdoor expansion A circuit in which a valve 55, a refrigerant storage tank 57, an indoor expansion valve 56, and an indoor heat exchanger 42 are connected in this order, and the indoor heat exchanger 42 returns to the compressor 30 via the second path 52 of the four-way valve 50. Is. The first path 51 of the compressor 30 and the four-way valve 50 flows through the flow path 91, the first path 51 of the four-way valve 50 and the outdoor heat exchanger 41 flow through the flow path 92, and the outdoor heat exchanger 41 and the outdoor expansion valve 55 flow. The outdoor expansion valve 55 and the refrigerant storage tank 57 are connected by the flow path 94, the refrigerant storage tank 57 and the indoor expansion valve 56 are connected by the flow path 95, and the indoor expansion valve 56 and the indoor heat exchanger 42 are connected by the flow path 96. The indoor heat exchanger 42 and the second path 52 of the four-way valve 50 are connected by a flow path 97, and the second path 52 of the four-way valve 50 and the compressor 30 are connected by a flow path 98. Further, when the outdoor heat exchanger 41 absorbs heat and the indoor heat exchanger 42 dissipates heat, the compressor 30, the third path 53 of the four-way valve 50, the indoor heat exchanger 42, and the indoor expansion valve 56, This is a circuit in which the refrigerant storage tank 57, the outdoor expansion valve 55, and the outdoor heat exchanger 41 are connected in this order, and the outdoor heat exchanger 41 returns to the compressor 30 via the fourth path 54 of the four-way valve 50. The third path 53 of the compressor 30 and the four-way valve 50 flows through the flow path 91, the third path 53 of the four-way valve 50 and the indoor heat exchanger 42 flow through the flow path 97, and the indoor heat exchanger 42 and the indoor expansion valve 56 flow. The indoor expansion valve 56 and the refrigerant storage tank 57 are connected by the flow path 95, the refrigerant storage tank 57 and the outdoor expansion valve 55 are connected by the flow path 94, and the outdoor expansion valve 55 and the outdoor heat exchanger 41 are connected by the flow path 93. The outdoor heat exchanger 41 and the fourth path 54 of the four-way valve 50 are connected by a flow path 92, and the fourth path 54 of the four-way valve 50 and the compressor 30 are connected by a flow path 98. The four-way valve 50 is used to switch the main circuit 21 depending on the operation of the refrigeration cycle device 20. The inside of the main circuit 21 is filled with a refrigerant typified by R32 and R410A and a compressor oil for lubricating the sliding portion of the compressor 30.

The compressor 30 is a rotary compressor, that is, a cylinder having a cylindrical internal space, a rotor arranged eccentrically with respect to the central axis inside the cylinder, and a slit provided on the cylinder wall surface so as to be slidably stored. It is provided with a sluice valve whose tip is always in contact with the cylindrical surface of the rotor, and communication holes to the main circuit 21 on both sides of the sluice valve in the cylinder.

The outdoor heat exchanger 41 and the indoor heat exchanger 42 are fin-and-tube heat exchangers, that is, aluminum plates having a thickness of about 0.1 mm having a plurality of round holes having a diameter of about 5 mm to 8 mm. It has fins with round holes bent like a collar and copper or aluminum tubes, and hundreds of fins are lined up to insert the tube into the round hole and spread the tube so that it adheres to the fins. It is configured.

The four-way valve 50 has a configuration capable of switching between the first path 51 and the second path 52, or the combination of the third path 53 and the fourth path 54 by using a valve provided inside.

The outdoor expansion valve 55 and the indoor expansion valve are configured to partially make it difficult for the refrigerant to flow by reducing the cross-sectional area of the path through which the refrigerant flows with respect to the main circuit 21 or switching between blocking and opening. ..

The refrigerant storage tank 57 includes a container and two communication holes for connecting to the main circuit 21, and a pipe extends from the communication holes to the lower part inside the container, and the liquid phase refrigerant accumulated in the lower part of the container. Is configured to return to the main circuit 21.

The indoor blower 62 generally uses a turbo fan, a sirocco fan, or a cross flow fan, but there is also one that uses an axial fan.

The outdoor blower 61 includes an axial fan 71, a bell mouth 81, and an electric motor 82. The outdoor heat exchanger 41, the electric motor 82, the axial fan 71, and the bell mouth 81 are arranged in this order in the direction from the upstream side to the downstream side of the air flow generated by the axial fan 71. .. The axial fan 71 is fixed to the rotating shaft of the electric motor 82. The electric motor 82 is fixed to the outdoor unit 22. The bell mouth 81 has a substantially cylindrical shape that surrounds the axial fan 71 with a predetermined gap in the circumferential direction with respect to the rotation axis of the axial fan 71, and at least partially in the rotation axis direction. It is arranged so as to overlap the axial fan 71 and fixed to the outdoor unit 22. The axial fan 71 has three blades at equal intervals around the rotating shaft.

In particular, the refrigeration cycle device 20 has two outdoor blowers 61, and the outdoor blowers 61 are adjacent to each other. The axial fan 71 constituting the outdoor blower 61 rotates in the opposite direction to each other, and has a mirror image shape so that the air can be blown in the same direction even if the rotary is reversed. It also has control software that operates the outdoor blower at an arbitrary rotation speed.

The operation and operation of the refrigerating cycle device 20 and the axial fan 71 configured as described above will be described below.

First, when the refrigeration cycle device 20 dissipates heat in the outdoor heat exchanger 41 and absorbs heat in the indoor heat exchanger 42, the refrigerant sealed in the main circuit 21 is in a low-temperature and low-pressure gas phase state in the main circuit 21. Is sucked into the compressor 30 and compressed into a high temperature and high pressure gas phase state by the compressor 30. The flow direction of the refrigerant is selected by the four-way valve 50 and flows to the outdoor heat exchanger 41, and the refrigerant dissipates heat by the outdoor heat exchanger 41 to enter a liquid phase of medium temperature and medium pressure. After the refrigerant is stored in the refrigerant storage tank 57, the amount of the refrigerant flowing is adjusted by the indoor expansion valve 56 and discharged, and the indoor heat exchanger 42 absorbs heat from the outside air and evaporates, resulting in a low-temperature and low-pressure gas phase. It returns and is compressed again by the compressor 30 into a high temperature and high pressure gas phase state. By this series of operations, the heat in the room is transferred to the outside through the refrigerant, which is the cooling operation in the air conditioner.

Further, when the refrigeration cycle device 20 absorbs heat in the outdoor heat exchanger 41 and dissipates heat in the indoor heat exchanger 42, in the main circuit 21, the refrigerant sealed in the main circuit 21 has a low-temperature and low-pressure gas phase. In this state, it is sucked into the compressor 30, and is compressed by the compressor 30 into a high-temperature and high-pressure gas phase state. The flow direction of the refrigerant is selected by the four-way valve 50, flows to the indoor heat exchanger 42, dissipates heat by the indoor heat exchanger 42, and becomes a medium-temperature, medium-pressure liquid-phase refrigerant. After the refrigerant is stored in the refrigerant storage tank 57, the amount of the refrigerant flowing is adjusted by the outdoor expansion valve 55 and discharged, and the refrigerant is radiated to the outside air in the outdoor heat exchanger 41 to evaporate, resulting in a low-temperature low-pressure gas phase. It returns and is compressed again by the compressor 30 into a high temperature and high pressure gas phase state. By this series of operations, the heat outside the room is transferred to the room through the refrigerant, which is a heating operation in the air conditioner.

When the outdoor heat exchanger 41 dissipates heat or absorbs heat, the efficiency of the outdoor unit 22 is improved by using the axial fan 71 together. That is, when the axial flow fan 71 is not used together, the outdoor heat exchanger 41 dissipates heat by the natural air flow that the hot air moves vertically upward or downward, so that the air exchange is small and the efficiency of the outdoor unit 22 is low. On the other hand, when the axial flow fan 71 is used in combination, the outdoor heat exchanger 41 dissipates heat by the air flow generated by the axial flow fan 71, so that the air is often replaced and the efficiency of the outdoor unit 22 can be improved. ..

In particular, the two adjacent axial fan 71s of the outdoor blower 61 are rotated in opposite directions by the control software, and the rotation speed is adjusted to maintain the blades in a staggered positional relationship.

As described above, in the present embodiment, the outdoor blower 61 having a plurality of axial flow fans 71 and the bell mouth 81 is provided, and the axial flow fans 71 are arranged adjacent to each other in a row. The 71 has a plurality of blades 72, and the bell mouth 81 surrounds the axial flow fan 71 so as to partially overlap in the rotation axis direction, and the plurality of axial flow fans 71 rotate in opposite directions to each other. In addition, the refrigerating cycle device 20 that rotates while maintaining the positional relationship in which the blades 72 of the arbitrary axial flow fan 71 are staggered with the blades 72 of the adjacent axial flow fan 71 operates as follows. However, the effect of improving the performance of the refrigerating cycle device 20 can be obtained.

As shown in FIG. 2, when the adjacent axial flow fan 71 rotates in the opposite direction, the blades 72 have no speed difference or a slight speed difference due to a predetermined rotation speed difference. Since the minimum distance between the blades 72 of the adjacent axial flow fans 71 is narrow as in the case of rotating in the same direction, the leakage flows collide at the intermediate point 89 when the blades 72 approach each other. On the other hand, by maintaining the positional relationship in which the adjacent axial flow fans 71 rotate in the opposite direction and the blades 72 are staggered, that is, the blades 72 operate by shifting the circumferential angle positions of the blades 72. Will be maintained at a predetermined distance or more, so that the collision of airflow can be further reduced. That is, since the pressure fluctuation depending on the rotation speed of the axial fan 71 and the number of blades can be reduced, the blowing noise can be reduced. Further, since the amount of air blown can be increased under the same noise condition and the amount of heat exchanged by the outdoor heat exchanger 41 can be increased, the performance of the refrigeration cycle device 20 can be improved.

(Embodiment 2) FIG. 3 shows a configuration diagram of an electric motor according to a second embodiment of the present invention.

FIG. 4 shows a waveform diagram of a comparator used for blower control according to the second embodiment of the present invention.

FIG. 5 shows a waveform diagram of an output signal of the electric motor according to the second embodiment of the present invention.

FIG. 6 shows a flow chart of control according to the second embodiment of the present invention. Note that FM in FIG. 6 means a fan motor (not shown). The same applies to the following drawings.

In FIG. 3, the electric motor 82 includes a stator 84, a rotor 83, a rotating shaft 87, and a D-cut 88. Further, the electric motor 82 includes a hall sensor (not shown), a comparator, and a bearing. The rotating shaft 87 is fixed to the rotor 83. Further, the rotating shaft 87 is rotatably held in the housing via bearings, and one bearing is attached to each side of the rotor 83. The rotor 83 is arranged as the inside of a concentric double cylinder that can rotate freely with respect to the stator 84. The stator 84 is composed of a coil and an iron core, and has four sets of three-phase star connections in which coils are wound in multiple layers on the iron core. The rotor 83 is composed of permanent magnets and has four pairs of north and south poles. Further, the rotary shaft 87 has a D-cut 88 so that the axial fan 71 does not slide in the rotational direction, and the arrangement of the D-cut 88 of the rotary shaft 87 and the magnet of the rotor 83 is always at the same position regardless of the individual. It is a relationship. The Hall sensor 74 is fixed to the housing in the vicinity of the rotor 83 with a predetermined inscribed angle interval. The comparator 73 is connected to the Hall sensor 74 as an electric circuit, and is also connected to a control board (not shown) at the same time. Further, the comparator 73 is connected to each of the three phases of the coil, and is also connected to the control board at the same time.

The operation and operation of the refrigerating cycle device 20 and the axial fan 71 configured as described above will be described below.

The rotational speed of the axial fan 71 having three blades is controlled by using the induced voltage generated in the electric motor 82.

In the electric motor 82, when two of the three phases of the coil of the stator 84 are energized, the rotor 83 rotates and moves to a predetermined rotation angle by electromagnetic induction. The rotor 83 rotates by periodically switching the two phases energized by the frequency oscillator.

In FIG. 4, the comparator 73 connected to the coil of the stator 84 converts the induced voltage generated in one non-energized phase into a digital signal. The combination of digital signals output from the comparator 73 is analyzed by control software to detect the rotation angle of the rotor 83, and the rotation speed is controlled by feeding it back to the frequency oscillator.

The control for maintaining the blades 72 of the adjacent axial flow fans 71 in a staggered positional relationship will be described.

FIG. 6 shows a control flowchart when the induced voltage is used. The D-cut 88 of the rotating shaft 87 and the magnet of the rotor 83 have a predetermined positional relationship, and the rotation angle of the axial fan 71 can be detected by detecting the rotation angle of the rotor 83. However, since the output of the comparator 73 is a digital signal and has a certain angle range when it is ON or OFF, it is difficult to detect the rotation angle at an arbitrary time, and the blades 72 have a staggered positional relationship. Requires the following control.

First, the first electric motor 82a and the second electric motor 82b are operated at an arbitrary rotation speed. Immediately after starting the control, the variable m_INIT_FM1 for identifying the rotation angle is set to 0 in the control software only once. The rotation angle of m_INIT_FM1 is set at any time in the loop of the control software.

The induced voltage of the first electric motor 82a is acquired as a digital signal via the comparator 73. As shown in FIG. 4, in one of the three phases of the stator 84, the induced voltage becomes one cycle in one rotation, and ON and OFF are in steps of 180 degrees. Since the three phases slide equally in the induced voltage, as shown in FIG. 5, the signal pattern when the respective signals are combined in increments of 60 degrees is determined. That is, the rotation angle can be detected in increments of 60 degrees. However, it means that the acquired rotation angle is within a certain range. Therefore, it is determined that the moment when the signal representing the rotation angle is switched is that angle. If the previous rotation angle, that is, m_INIT_FM1 at a sufficiently short time interval is not 0 degrees at a certain time point, and the current rotation angle is 0 degrees, it means that the time point is 0 degrees.

The control of the second electric motor 82b is started with reference to the time when the first electric motor 82a is 0 degrees. The blades 72 are maintained in a staggered positional relationship by continuously correcting the rotation speed of the second electric motor 82b with reference to the first electric motor 82a. That is, when the first electric motor 82a is 0 degrees, the rotation angle of the second electric motor 82b is acquired, and if the rotation angle of the second electric motor 82b is 360 ÷ (number of blades × 2) or more, that is, the second electric motor 82b Is behind the first electric motor 82a by a predetermined angle, the second electric motor 82b is accelerated. On the contrary, if the second electric motor 82b is ahead of the predetermined angle with respect to the first electric motor 82a, the second electric motor 82b is decelerated. By constantly repeating this operation and continuing to correct it, the position of the second motor 82b with respect to the first motor 82a is maintained.

As described above, in the present embodiment, the outdoor blower 61 uses the DC brushless type electric motor 82 as rotational power, the stator 84 of the electric motor 82 has three phases, and is generated in the coil of the stator 84 of the electric motor 82. The refrigeration cycle device 20 is characterized in that it is used as a rotation angle detection device by utilizing the induced voltage and the position of the blade 72 is corrected by using the output signal of the rotation angle detection device. As a result, by comparing the combination of each phase of the induced voltage generated in the electric motor 82, it is necessary to make the blades 72 of two adjacent axial flow fans 71 having three blades staggered. Since the rotation angle of the electric motor 82 is clarified, it is not necessary to arrange a position detection device such as a hall sensor 74 in a narrow portion where the rotor 83 and the stator 84 are intricate, and the manufacturing process is simplified and defects are reduced, so that reliability is achieved. Can be improved.

(Embodiment 3) FIG. 7 shows a list of the resolution and period of the arrangement of the Hall sensor and the detection of the rotation angle in the third embodiment of the present invention.

8 to 18 show the arrangement and output signal of the Hall sensor in the third embodiment of the present invention.

FIG. 19 shows a control flowchart according to a third embodiment of the present invention.

As shown in FIG. 12, the number of poles of the rotor 83 is 6, and one hall sensor 74 is arranged in the vicinity of the rotor 83. The Hall sensor 74 is connected to the control board via a comparator 73.

The operation and operation of the refrigerating cycle device 20 and the axial fan 71 configured as described above will be described below.

The rotation angle is detected by using the hall sensor 74 built in the electric motor 82, and the rotation speed of the axial fan 71 is controlled. The Hall sensor 74 is a sensor that detects a magnetic force and converts it into a voltage, outputs a wave-shaped voltage following the rotation of a permanent magnet provided in the rotor 83, and is converted into a digital signal by a comparator 73.

In FIG. 7, when the number of poles of the rotor 83 is 2 or 6 poles, the period is a multiple of 120 degrees, and some have a resolution of 60 degrees depending on the arrangement of the hall sensor 74, which is used in the 3-blade axial fan 71. it can. In addition, it can be used when the resolution is 15 degrees or 30 degrees, which is a common divisor of 60 degrees. Further, when the number of poles of the rotor 83 is 4 or 8 poles, the period is a multiple of 90 degrees and the resolution is 45 degrees, which can be used in the 4-blade axial fan 71. In addition, it can be used when the resolution is 15 degrees, which is a common divisor of 45 degrees.

Since the number of poles of the rotor 83 is 6 and the number of hall sensors 74 is 1, a combination of a period of 120 degrees and a resolution of 60 degrees is used to realize a staggered positional relationship with a 3-blade axial fan. There is.

When the Hall sensor 74 is used, it is controlled as shown in FIG. First, the first electric motor 82a and the second electric motor 82b are operated at an arbitrary rotation speed. Immediately after starting the control, the variable m_INIT_FM1 for identifying the rotation angle is set to 0 in the control software only once. The rotation angle of m_INIT_FM1 is set at any time in the loop of the control software.

The output voltage of the Hall sensor 74 of the first electric motor 82a is acquired as a digital signal via the comparator 73. However, it means that the acquired rotation angle is within a certain range. Therefore, it is determined that the moment when the signal representing the rotation angle is switched is that angle. For example, the determination is made as follows. The rotation angle is always substituted for m_INIT_FM1. If the previous rotation angle, that is, m_INIT_FM1 at a sufficiently short time interval is not 0 degrees at a certain time point, and the current rotation angle is 0 degrees, it means that the time point is 0 degrees.

The control of the second electric motor 82b is started with reference to the time when the first electric motor 82a is 0 degrees. The blades 72 are maintained in a staggered positional relationship by continuously correcting the rotation speed of the second electric motor 82b with reference to the first electric motor 82a. That is, when the first electric motor 82a is 0 degrees, the rotation angle of the second electric motor 82b is acquired, and if the rotation angle of the second electric motor 82b is 360 ÷ (number of blades × 2) or more, that is, the second electric motor 82b Is behind the first electric motor 82a by a predetermined angle, the second electric motor 82b is accelerated. On the contrary, if the second electric motor 82b is ahead of the predetermined angle with respect to the first electric motor 82a, the second electric motor 82b is decelerated. By constantly repeating this operation and continuing to correct it, the position of the second motor 82b with respect to the first motor 82a is maintained.

As described above, in the present embodiment, the outdoor blower 61 uses the electric motor 82 as the rotational power, and one or more Hall sensors 74 inside the electric motor 82 as the rotation angle detection device to detect the rotation angle. The refrigeration cycle device is characterized in that the position of the blade 72 is corrected by using the output signal of the device. As a result, since the electric motor 82 has the hole sensor 74, the rotation angle of the electric motor 82 required for the blades 72 of the two adjacent axial flow fans 71 to be in a staggered positional relationship becomes clear, and an inexpensive hole is used. By using the sensor 74, it is possible to reduce the cost because it is not necessary to use an expensive motor while having high accuracy using an encoder or the like.

(Embodiment 4) FIG. 20 shows a control flowchart when the induced voltage and the Hall sensor are used together in the fourth embodiment of the present invention.

The axial fan 71 has three blades. The electric motor 82 has eight rotor poles and has three hall sensors 74. A comparator 73 is connected to each of the coils of the Hall sensor 74 and the stator 84, and the comparator 73 is connected to the control board.

The operation and operation of the refrigerating cycle device 20 and the axial fan 71 configured as described above will be described below.

In FIG. 7, the number of controllable blades is a multiple of 3 because the period is 120 degrees when the number of rotor poles is 6 and a multiple of 4 because the period is 90 degrees when the number of rotor poles is 8. The number of rotor poles is usually eight, and the three-blade axial flow fan 71 is controlled in a staggered positional relationship.

First, the first electric motor 82a and the second electric motor 82b are operated at an arbitrary rotation speed. After the operation starts, m_INIT_FM1, which is a variable for identifying the rotation angle, is set to 0 in the control software only once at the beginning of the control. The rotation angle of m_INIT_FM1 is set at any time in the loop of the control software.

The induced voltage of the first electric motor 82a is acquired as a digital signal via the comparator 73. However, it means that the acquired rotation angle is within a certain range. Therefore, it is determined that the moment when the signal representing the rotation angle is switched is that angle. For example, the determination is made as follows. The rotation angle is always substituted for m_INIT_FM1. If the previous rotation angle, that is, m_INIT_FM1 at a sufficiently short time interval is not 0 degrees at a certain time point, and the current rotation angle is 0 degrees, it means that the time point is 0 degrees.

When the first motor 82a is 0 degrees, the rotation angle of the second motor 82b is acquired from the induced voltage, and the rotation angle of the second motor 82b is larger than 0 degrees and smaller than 360 ÷ (number of blades × 2). For example, the output of the hall sensor 74 of the second electric motor 82b is acquired. If the rotation angle of the second electric motor 82b is larger than 360 ÷ (the number of blades × 2), that is, if the second electric motor 82b lags behind the first electric motor 82a by a predetermined angle, the second electric motor 82b is accelerated. .. On the contrary, if the second electric motor 82b is ahead of the predetermined angle with respect to the first electric motor 82a, the second electric motor 82b is decelerated. By constantly repeating this operation and continuing to correct it, the position of the second motor 82b with respect to the first motor 82a is maintained.

As described above, in the present embodiment, the axial blower uses the electric motor 82 as the rotational power, determines the reference position of the rotation angle by using the induced voltage of the electric motor 82, and outputs the output signal of the hall sensor 74. The refrigeration cycle device 20 is characterized in that the position of the blade 72 is corrected by utilizing the above. As a result, the resolution of the rotation angle obtained by the induced voltage is low because it depends on the number of phases of the coils of the stator 84, and the Hall sensor 74 has a high resolution but is periodic in one rotation depending on the number of poles of the rotor 83. Since the signal is repeated, the position during one rotation cannot be specified, but the induced voltage is used to monitor whether or not the position is the reference position, and when the reference position is reached, the Hall sensor 74 detects the rotation angle to improve the resolution. .. As a result, the rotation angle can be detected with high resolution at least once in one rotation, so that the number of blades of the axial flow fan 71 and the combination of the electric motor 82 that make the blades 72 staggered can be increased. Therefore, the collision of the leak flow at the intermediate position of the adjacent axial flow fan 71 can be reduced, so that the ventilation noise can be reduced by various outdoor blowers 61.

The refrigeration cycle device 20 may have the following configuration with respect to the first embodiment.

The compression type of the compressor 30 may be a rotary type, a scroll type, a reciprocating type, or a turbo type. The power of the compressor 30 may be an electric motor provided inside the compressor 30, an electric motor independent of the compressor may be used as the power source, or a prime mover may be used as the power source instead of the electric motor. Any type or power can be used as long as the mechanism can compress the gas phase refrigerant.

The indoor unit 23 may be a chiller module that controls the temperature of water instead of controlling the temperature of the air in the room, and is integrated into a chemical substance fractionation facility or the like without taking the form of a single housing. It may be. As long as the configuration allows heat exchange from the main circuit 21 to the outside, the target and form of temperature control do not matter.

The indoor heat exchanger 42 is a heat exchanger in which flat tubes are arranged, or a heat exchanger in which cylindrical tubes having different diameters are arranged coaxially. The tubes are arranged inside the container. It may be a heat exchanger. Any type can be used as long as it is configured to transfer heat between fluids.

The outdoor heat exchanger 41 may be a heat exchanger in which flat tubes are arranged side by side. Any type can be used as long as the heat exchange can be promoted by passing the air flow generated by the axial fan 71.

The refrigerant sealed in the main circuit 21 may be CO2 or the like that does not undergo a phase change, and the type of the refrigerant does not matter.

As described above, since the refrigeration cycle apparatus according to the present invention has low noise and high performance, it can be applied not only to air conditioners but also to applications such as chillers. Further, since the axial-flow blower and the control method used in the refrigeration cycle device according to the present invention are highly versatile, a cooling fan that uses a plurality of axial-flow blowers in parallel in a computer, a stabilized power supply, or the like as an axial-flow blower, or It can also be applied to applications such as circulators and ventilation devices in which small fans are arranged in parallel to save space, and smoke exhaust devices in tunnels where multiple small fans are often installed in one place.

20 Refrigeration cycle device 21 Main circuit 22 Outdoor unit 23 Indoor unit 30 Compressor 41 Outdoor heat exchanger 42 Indoor heat exchanger 50 Four-way valve 51 1st route 52 2nd route 53 3rd route 54 4th route 55 Outdoor expansion valve 56 Indoor expansion valve 57 Refrigerant storage tank 61 Outdoor blower 62 Indoor blower 63 Housing 71 Axial flow fan 72 Blade 73 Comparator 74 Hall sensor 81 Bellmouth 82 Electric motor 82a 1st electric motor 82b 2nd electric motor 83 Rotor 84 stator 87 Rotating shaft 88 D Cut 89 Midpoint 91-98 Channel

Claims (4)

Equipped with a blower with multiple axial fans and bell mouths,
The axial fans are arranged adjacent to each other in a row.
The axial fan has a plurality of blades and has a plurality of blades.
The bell mouth surrounds the axial fan so as to partially overlap in the direction of the rotation axis.
A refrigeration cycle in which a plurality of the axial-flow fans rotate in opposite directions, and the blades of any of the axial-flow fans rotate while maintaining a positional relationship in which the blades of the adjacent axial-flow fans alternate with the blades of the adjacent axial-flow fans. apparatus. The blower uses a DC brushless electric motor as rotational power.
The motor stator has three phases.
It is used as a rotation angle detection device by utilizing the induced voltage generated in the stator coil of the electric motor.
The refrigeration cycle device according to claim 1, wherein the position of the blade is corrected by using the output signal of the rotation angle detection device. The blower uses the electric motor as rotational power,
One or more Hall sensors are used as the rotation angle detection device inside the electric motor.
The refrigeration cycle device according to claim 1, wherein the position of the blade is corrected by using the output signal of the rotation angle detection device. The blower uses the electric motor as rotational power,
The reference position of the rotation angle is determined by using the induced voltage of the electric motor.
The refrigeration cycle apparatus according to claim 1, wherein the position of the blade is corrected by using the output signal of the hall sensor.

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