TW201837408A - Machine with reactor capable of reducing vibration of the machine in which a metal material is arranged around the reactor - Google Patents

Abstract

The purpose of the invention is to reduce vibration of a machine in which a metal material is arranged around a reactor. The machine comprises: a control substrate; a reactor electrically connected to the control substrate; a control substrate accommodation section accommodated therein with the control substrate and the reactor; and a planar section or control substrate cover arranged to be substantially parallel to the control substrate, and formed by metal-containing material, which is characterized in that: leakage magnetic flux amount generated when current flows in the reactor is anisotropic so that the reactor is configured in a manner that the direction in which the planar portion or the control substrate cover is located becomes the direction in which the leakage magnetic flux amount is smaller.

Description

Machine with reactor

[0001] The present invention relates to a machine having a reactor.

[0002] It is known to provide a converter circuit that converts a commercial power source into a DC voltage for the purpose of variable speed of a compressor motor. In the converter circuit, a diode bridge and an electrolytic capacitor for smoothing are usually provided. However, it is difficult to reduce the influence of harmonic components only by providing an electrolytic capacitor for smoothing. Therefore, it is known that a reactor is provided before the diode bridge and the electrolytic capacitor for smoothing. [0003] However, this reactor generates leakage magnetic flux when it is energized, especially as it is reduced in size. When a plate-shaped metal is arranged near the reactor, for example, leakage magnetic flux may interfere with the metal and may generate noise. [0004] As a countermeasure against the noise caused by the leakage magnetic flux, Patent Document 1 discloses that a vibration-proof metal cover 14 is provided between the reactor and the substrate case cover 2. [Prior Art Document] [Patent Document] [0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 11-102825

[Problems to be Solved by the Invention] 0006 [0006] When a metal member different from the substrate case cover 2 is used as in Patent Document 1, the area where a reactor or the like is accommodated becomes large. When a reactor or the like is installed in a freezer, for example, there is a problem that the storage compartment area of the freezer is reduced. [Means for Solving the Problems] [0007] In view of the foregoing, the present invention is a machine including: a control board; a reactor electrically connected to the control board; and a control board storage section for storing the control board and the above. A reactor; and a planar portion or a control substrate cover, which is disposed substantially parallel to the control substrate and is formed of a metal material; characterized in that the leakage magnetic flux generated when a current flows into the reactor is anisotropic, The said reactor is arrange | positioned so that the direction in which the said plane part or the said control board cover is located becomes the direction where the said leakage magnetic flux is small.

[0009] Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. In the embodiment, although a freezer is described as an example of a machine having a control board and a reactor, as long as it has a control board and a reactor, and has a control board housing section or a control formed of a metal material, for example, The substrate cover is sufficient, and the machine is not particularly limited. [Embodiment 1] [0010] FIG. 1 is a front view of the freezer 1 of this embodiment, FIG. 2 is an X-X sectional view of the freezer 1, and FIG. 3 is an exploded perspective view of the control substrate 7 and the mounting structure of the control substrate 7. (2) The freezer 1 includes a plurality of storage rooms for storing food. In this embodiment, a refrigerator compartment 2, a vegetable compartment 3, and a freezer compartment 4 are provided. Inside the back surface of the freezer 1, for example, a compressor 5 driven by a motor capable of applying three-phase AC power, a fan motor 6 for circulating the cooling air in the freezer 1, a motor for the compressor 5 or a fan motor 6 A control board 7 for driving and controlling, an indoor temperature sensor that detects the temperature of each storage room, and a refrigeration cycle element are configured. [0011] The refrigeration cycle elements are composed of a compressor 5, a condenser, an expansion valve, an evaporator, and a refrigerant piping as is well known, and their constituent elements are mainly arranged on the back side and the side of the freezer 1. [0012] [Control Board Storage Unit 10] The freezer 1 includes a back plate 11 made of a metal material on the back side. A control board storage portion 10 is provided on the back plate 11. The control board storage portion 10 includes a flat portion 101 that can be formed as a region in which a part of the back plate 11 is recessed toward the front side, and is substantially parallel to a plane direction of a control substrate 7 described later; and a side that is substantially perpendicular to the flat portion 101.周 部 102。 102. The planar portion 101 is, for example, a quadrangular shape, and the side peripheral portion 102 may be, for example, a ring shape having a smaller size than the planar portion 101. In the vicinity of the frequency of the leakage magnetic flux generated by the reactor 8 to be described later, the side peripheral portion 102 has a shape that is less likely to generate resonance than the flat portion 101. The frequency of this leakage magnetic flux is the same as the frequency range of the AC current flowing into the reactor 8. [0013] In a region where the control substrate storage portion 10 is provided, the flat portion 101, the frame 9, the control substrate 7, the reactor 8, and the control substrate cover of the control substrate storage portion 10 are sequentially installed from the front side of the freezer 1. 12. As such, the control substrate storage portion 10 is located on one side of the reactor 8, and the control substrate cover 12 is located on the other side of the reactor 8. The control board storage section 10 and the control board cover 12 are formed of a metal material, for example, a sheet metal material, and are provided substantially parallel to the control board 7. [0014] The frame 9 may be formed of a resin material, the control substrate 7 is mounted on the control substrate arrangement portion 91, and the reactor 8 is mounted on the reactor arrangement portion 92. The reactor 8 is arranged in the reactor arrangement portion 92 so that a part of the reactor 8 overlaps with the inside of the control substrate 7, that is, it is arranged beside the control substrate 7. The reactor 8 is engaged with the claws provided in the frame 9. As described later, in this embodiment, the direction in which the leakage magnetic flux of the reactor 8 is large is set to the side peripheral portion 102 side. Therefore, it is preferable that the distance from the reactor 8 to the side peripheral portion 102 is longer than that of the reactor 8 to the plane. The distance between the parts 101 is long. [0015] The distance from the reactor 8 to the control substrate cover 12 and the distance from the reactor 8 to the plane portion 101 can be preferably set by adjusting the thickness of the frame 9. If the flat surface portion 101 is compared with the control substrate cover 12, the flat surface portion 101 is supported by a foamed heat insulation material or a vacuum insulation material. On the other hand, the control substrate cover 12 is disposed in a relatively free state. Therefore, the control substrate cover 12 is more likely to cause vibration. Based on this, in this embodiment, the distance from the reactor 8 to the control substrate cover 12 is set to be longer than the distance from the reactor 8 to the flat portion 101. In this way, the leakage magnetic flux to the control substrate cover 12 can be relatively reduced, and thus vibration can be suppressed. [0016] [Electrical System] FIG. 4 is a block diagram of an electrical system including a control board 7 according to this embodiment. [0017] The control board 7 is provided with a converter circuit 16, an inverter circuit 18, a control power circuit 19, a load control circuit 22 in the library, and a compressor control circuit 23. [0018] (Converter Circuit 16) The converter circuit 16 can convert the AC power of the commercial power source 13 into DC power. The converter circuit 16 includes two diodes 141 and 142, and two smoothing electrolytic capacitors 151 and 152 connected in series between the two diodes 141 and 142. [0019] The positive side of the diode 141 is electrically connected to one end of a reactor 8 disposed outside the control substrate 7, and the other end of the reactor 8 is electrically connected to one end of a commercial power source 13. The negative electrode side of the diode 141 is electrically connected to one end of the smoothing electrolytic capacitor 151. [0020] The other end of the smoothing electrolytic capacitor 151 is electrically connected to the other end of the commercial power source 13 and one end of the smoothing electrolytic capacitor 152. [0021] The positive side of the diode 142 is electrically connected to the other end of the smoothing electrolytic capacitor 152, and the negative side is electrically connected to the negative side of the diode 141 and one end of the reactor 8. [0022] The negative and positive sides of the diode 141 are electrically connected to the input terminals of the inverter circuit 18 and the control power circuit 19, respectively. The commercial power source 13 has, for example, an AC waveform of 100 V / 50 Hz. [0023] According to the converter circuit 16 thus configured, the AC power of the commercial power source 13 is converted into a high-voltage DC voltage 17. [0024] In order that the AC power of the commercial power source 13 is preferably formed into a DC high-voltage DC voltage 17, a smoothing electrolytic capacitor 15 is used. Only when the applied voltage from the commercial power source 13 is greater than the respective voltages of the smoothing electrolytic capacitors 151 and 152, a current flows into the smoothing electrolytic capacitor 15 in a form that compensates the discharge energy of the smoothing electrolytic capacitor 15, and therefore, it contains a high voltage. Sub-harmonic current waveform. Therefore, the reactor 8 provided as a component for suppressing higher harmonics is arranged in front of the smoothing electrolytic capacitor 15 (converter circuit 16). The mounting structure of the reactor 8 will be described later. [0025] (Inverter circuit 18) The inverter circuit 18 can issue a control signal for variable-speed driving of the compressor 5. In order to perform variable-speed driving of the motor of the compressor 5, it is necessary to apply an AC voltage waveform corresponding to the number of rotations. [0026] The high-voltage DC voltage 17 formed by the converter circuit 16 is converted into an arbitrary AC waveform by the inverter circuit 18. Which AC waveform is formed is controlled by a command from the compressor control circuit 23. [0027] As such, the high-voltage DC voltage 17 is converted into an arbitrary AC waveform by an inverter circuit 18 (three-phase AC generating circuit) using six semiconductor power elements such as IGBTs, and is output to the compressor 5 . [0028] (Control Power Circuit 19) The high-voltage DC voltage 17 is supplied not only to the inverter circuit 18, but also to the control power circuit 19. The control power circuit 19 steps down the high-voltage DC voltage 17 and generates a low-voltage DC voltage 20 of, for example, 12V or 5V. The low-voltage DC voltage 20 is used to drive the fan motor 6 or to supply the power supply voltage of the load control circuit 22 in the library to which information of the various temperature sensors 21 and temperature sensors 21 is input and which controls each part. [0029] (Reactor 8) FIG. 5 is a perspective view of (a) a reactor 8 and (b) a perspective view of an iron core 80 inside the reactor 8 in this embodiment. [0030] The reactor 8 includes an iron core 80, a winding wire 84 wound around the iron core 80, and a bobbin 83 that houses the winding wire 84. The iron core 80 includes an E-shaped iron core 81 and an I-shaped I iron core 82. The I iron core 82 is located on the right side of the "E" shape (the "≡" portion) of the E iron core 81 with a gap of 24, and faces the left portion of the "E" shape, that is, the rod portion (the "|" ) Extends in a direction substantially parallel. The two ends of the winding wire 84 respectively extend from the outer part of the reactor 8, and the through terminals can be installed in the control substrate 7, which should be connected to the winding wire 84. [0031] A gap 24 is formed between the E iron core 81 and the I iron core 82 to prevent a reduction in inductance caused by magnetic saturation. The gap 24 may be formed by air or a sheet. The sheet may use an insulator. [0032] It is easy to avoid magnetic saturation by the gap 24, but on the other hand, magnetic flux also easily leaks from the gap 24. If the leakage magnetic flux interferes with the control substrate cover 12 or the control substrate storage portion 10, the control substrate cover 12 or the control substrate storage portion 10 (particularly the flat portion 101) made of metal material will vibrate and become a main cause of noise. The leakage magnetic flux caused by the reactor 8 in this embodiment is anisotropic, and there are a direction in which the leakage magnetic flux is more (multiple leakage direction) and a direction in which there is less (the direction of less leakage). That is, the relationship of (leakage magnetic flux in the multiple leakage direction)> (leakage magnetic flux in the small leakage direction) holds. [0033] (Position relationship between the reactor 8 and the control substrate cover 12 and the flat portion 101) 中 In this embodiment, the reactor 8 is arranged independently of the control substrate 7, and further connected to the control substrate through a terminal of a winding 84 7, so the direction of the reactor 8 can be adjusted more freely. [0034] FIG. 6 is a comparative example, (a) shows a state where the multiple leakage directions of the reactor 8 are arranged substantially parallel to the perpendicular lines of the control substrate cover 12 and the flat portion 101, and (b) shows a leakage magnetic flux. A radar chart drawn in various directions relative to this state. FIG. 7 is a diagram of the present embodiment, (a) shows a state where the multiple leakage directions of the reactor 8 are arranged substantially parallel to the control substrate cover 12 and the flat portion 101, and (b) shows a state where the leakage magnetic flux is relative to the state Radar chart drawn in all directions. [0035] Among the core shapes used in the comparative example and this example, the directions toward the left and right sides of the “E” shape of the E core 81 (directions 1 and 5 in FIG. 6 (b), and the paper surface in FIG. 7 (b) The vertical direction of the leakage magnetic flux is in the direction of the "E" shape (3 and 7 directions in Fig. 6 (b), 3 and 7 directions in Fig. 7 (b)) and the vertical direction on the paper surface ( The paper surface in FIG. 6 is perpendicular to the direction, and directions 1 and 5 in FIG. 7 (b) are large. [0036] Therefore, when the reactor 8 is arranged as in the comparative example, the magnetic flux in the multiple leakage direction is incident substantially perpendicularly to the control substrate cover 12 or the flat portion 101. That is, the leakage magnetic flux generated in the perpendicular direction of the control board cover 12 or the flat portion 101 is large, and it can be seen that it is an arrangement that easily interferes with the sheet metal member. [0037] On the other hand, when the reactor 8 is arranged as in this embodiment, the magnetic flux in the direction of less leakage is incident substantially perpendicularly to the control substrate cover 12 or the flat portion 101. That is, the leakage magnetic flux generated in the perpendicular direction of the control substrate cover 12 or the flat surface portion 101 is small, and it can be seen that it is an arrangement that does not easily interfere with the sheet metal member. [0038] In addition, the multi-leakage direction and the little-leakage direction are not necessarily limited to being substantially orthogonal to each other, and depend on how the core is formed. For example, the direction of the small leakage may also be considered to be 0.7 of the leakage magnetic flux in the direction in which the leakage magnetic flux is the largest Times below the direction. [0039] As described above, according to this embodiment, as shown in FIG. 7, the distribution of the leakage magnetic flux generated by the reactor 8 is grasped, and the reactance is arranged in a direction in which the leakage magnetic flux does not easily interfere with the surrounding sheet metal components. According to this, the noise generated by the leakage magnetic flux of the reactor can be reduced.

[0040]

1‧‧‧freezer

2‧‧‧ freezer

3‧‧‧ Vegetable Room

4‧‧‧ freezer

5‧‧‧compressor

6‧‧‧fan motor

7‧‧‧Control Board

8‧‧‧Reactor

80‧‧‧ Iron core

81‧‧‧E Iron Core

82‧‧‧I Iron Core

9‧‧‧ frame

10‧‧‧Control board storage section

101‧‧‧Plane Department

102‧‧‧side perimeter

11‧‧‧ back panel

12‧‧‧Control board cover

13‧‧‧Commercial Power

141, 142‧‧‧diodes

151, 152‧‧‧ smoothing electrolytic capacitors

16‧‧‧ converter

17‧‧‧ high voltage DC voltage

18‧‧‧Inverter circuit

19‧‧‧Control power circuit

20‧‧‧ low voltage DC voltage

21‧‧‧Temperature sensors

22‧‧‧Load control circuit in the library

23‧‧‧compressor control circuit

24‧‧‧ Clearance

[0008] [FIG. 1] A front view of the freezer of Embodiment 1. [Fig. 2] X-X sectional view of the freezer of Example 1. [Fig. 3] An exploded perspective view of the control substrate and the mounting structure of the control substrate in the first embodiment. [Fig. 4] A block diagram of an electrical system provided in a control board according to the first embodiment. [Fig. 5] (a) An oblique view of the reactor of Example 1 and (b) An oblique view of an iron core inside the reactor. [Fig. 6] (a) of the comparative example is a diagram showing a state where a reactor is installed, and (b) is a radar diagram of leakage magnetic flux generated in each direction when the reactor is installed. [FIG. 7] (a) of the first embodiment is a diagram showing a state where a reactor is installed, and (b) is a radar diagram of leakage magnetic flux generated in each direction when the reactor is installed.

Claims (4)

A machine having: a control board; a reactor electrically connected to the control board; a control board storage section for storing the control board and the reactor; and a flat section or a control board cover substantially parallel to the control board It is provided and is made of a metal material. It is characterized by: The leakage magnetic flux generated when current flows into the reactor is anisotropic, so that the direction of the plane portion or the position of the control substrate cover is smaller than the leakage magnetic flux. The above-mentioned reactors are configured in a direction of the direction. For example, the machine according to the first patent application range, wherein the control board storage portion has a side peripheral portion that is less prone to resonance than the flat portion in at least one of the frequencies of the AC current flowing into the reactor; The reactor is arranged such that a direction in which the leakage magnetic flux is large is directed to the side peripheral portion, and a direction in which the leakage magnetic flux is small is directed to the flat surface portion or the control substrate cover. For example, the machine for which the scope of the patent application is item 1 or 2, in which the reactor is independent of the control board and can be adjusted in direction. For example, the machine according to any one of claims 1 to 3 has the above-mentioned plane portion and the above-mentioned control substrate cover; The above-mentioned plane portion and one of the above-mentioned control substrate cover have an AC current flowing into the reactor compared to the other. Resonance is more likely to occur in at least one of the frequencies; The distance from the reactor to the one is shorter than the distance from the reactor to the other.