KR20100099859A - Electromotive compressor having inverter - Google Patents

Abstract

PURPOSE: An electric compressor with an inverter is provided to reduce the size of a mainboard using the bus bar assembly formed separately from the mainboard. CONSTITUTION: An electric compressor comprises an inverter. The inverter is installed in an inverter housing formed on one side of a compressor housing and changeably controls the rotation speed of a compressor drive motor. The inverter comprises a mainboard(110), bus bar assembly(120), a low power element, and a high power element. The mainboard supplies the power to the drive motor. The bus bar assembly comprises a bus bar(121) electrically connected to the mainboard and an insulator(122) covering the bus bar. The low power element is mounted on the mainboard. The high power element is mounted on the insulator and is connected to the bus bar.

Description

Electric compressor with inverter {ELECTROMOTIVE COMPRESSOR HAVING INVERTER}

The present invention relates to a motor-driven compressor, and more particularly, to a motor-driven compressor equipped with an inverter that can have a more compact appearance size by reducing the size of the printed circuit board constituting the inverter.

In general, a compressor applied to a refrigeration air conditioner has been developed and used in various ways such as a reciprocating type, a rotary type and a scroll type according to its operation.

In addition, the electric compressor using the electric motor as a power source of the compressor consists of a motor unit including a drive motor and a compression unit for compressing the refrigerant.

In general, an electric compressor has an inverter that adjusts the rotational speed of the drive motor in order to variably adjust the cooling efficiency of the refrigerating and air conditioning apparatus when the external load condition changes, and is installed on one side of the compressor housing.

Specifically, such an inverter is disposed inside the inverter housing provided on one side of the compressor housing, and includes a printed circuit board (PCB) on which various circuit elements are mounted.

Meanwhile, the circuit device may be divided into a low power device that requires less power when driving an inverter, and a high power device that requires a relatively higher power than the low power device.

The low power device may include an MCU including an IC in which an inverter operation program is stored, and the high power device may include a high voltage regulator, an inductor, and an input capacitor.

Conventionally, such a MCU, a high voltage regulator, an inductor and an input capacitor have been implemented on a single printed circuit board.

That is, the various circuit elements are self-inserted or inserted into the pattern lines on the printed circuit board to enable electrical connection.

Here, the widths of all the pattern lines are formed to be inconsistent. Specifically, the pattern lines connected to the high power devices are connected to the low power devices in order to prevent the pattern lines through which the high power is energized when the power is applied. Its width is relatively large.

In addition, in order to prevent electrical shorts between the pattern lines while satisfying the electrical safety standards such as KS, the distance between the pattern lines connected to the high power device and the pattern line connected to the high power device. And the distance between the pattern lines connected to the low power device is greater than the distance between the pattern lines connected to the low power device.

Therefore, when the low power and high power devices are mounted on one printed circuit board while satisfying the above conditions, the size of the entire printed circuit board is increased.

Furthermore, as the size of the printed circuit board increases, the size of the inverter housing also increases, and eventually, the overall size of the compressor increases.

An object of the present invention is to solve the above problems, it is possible to reduce the size of the inverter by configuring a configuration for applying the power to the high-power device separately from the printed circuit board, and furthermore a more compact appearance size It is to provide an electric compressor equipped with an inverter that may have.

Electric compressor equipped with an inverter of the present invention devised to achieve the object as described above, an electric compressor equipped with an inverter for variably adjusting the rotational speed of the compressor drive motor in the inverter housing formed on one side of the compressor housing The inverter comprises: an upper main board for supplying power to the drive motor; A lower busbar assembly including a bus bar electrically connected to the main board and an insulator surrounding the bus bar; A low power device mounted on the main board; And a high power device mounted on the insulator so as to be connected to the bus bar, and having a relatively high power compared to the low power device.

In addition, the bus bar assembly is fixed to the inner bottom surface of the inverter housing, characterized in that the suction refrigerant passes under the bottom surface of the inverter housing.

In addition, the bus bar assembly is characterized in that the fixed in contact with the inner surface of the inverter housing.

In addition, the bottom surface of the bus bar assembly is characterized in that the compound is attached.

The insulator may include a base part having a power input end for supplying external power to the bus bar at one end and a bent part bent upward from the other end of the base part.

In addition, the base portion is formed with a chamfer between the edge of the inverter housing, the main board and the bus bar assembly is a connection pin provided to be connected to the bus bar to the chamfer, or bus bar protruding from the upper surface of the bent portion It is characterized in that it is electrically connected through.

According to the electric compressor equipped with an inverter according to the present invention described above, by having a bus bar assembly formed separately from the main board, the bus bar for power supply to a high-power device can be concentrated and at the same time the size of the main board than before. It is effective to provide a compressor having a more compact appearance size by reducing the.

In addition, the bus bar assembly is brought into contact with the inner bottom surface of the inverter housing to cool the high heat generated from the high power device by the low temperature refrigerant in the compressor housing to improve the circuit safety.

In addition, the bus bar assembly can be brought into close contact with the inner surface of the inverter housing to enable a more compact configuration, thereby increasing space utilization.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic cross-sectional view showing an electric compressor equipped with an inverter according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing an electric compressor equipped with an inverter according to an embodiment of the present invention, and FIG. 4 is a plan view showing a part of an open state of the cover, and FIG. 4 is a cross-sectional view taken along line II of FIG.

As shown in FIG. 1, an inverter 100 is installed at one side of a compressor according to the present invention.

The compressor is a component constituting the air conditioner, and the drive shaft is rotated by a drive motor mounted inside the compressor housing, not a method in which the drive shaft inside is rotated by receiving power from a separate power generator, that is, an engine. It is an electric compressor.

That is, the compressor is provided with a compression unit 150 having a configuration for compressing the refrigerant therein and a drive unit 160 having a drive motor for operating the compression unit, the inverter 100 is a drive motor An outer circumferential surface of the compressor housing 170 adjacent to the portion to be disposed, specifically, is formed on one side of the outer circumferential surface and is installed inside the inverter housing 190 in which the upper opening is closed by the cover 180.

At this time, a suction flow path 200 through which a refrigerant of low temperature and low pressure flows is formed at the bottom of the inverter housing 190 and inside the compressor.

Here, the inverter 100 is for controlling the circulation amount of the refrigerant circulating along the air conditioner cycle by varying the rotational speed of the drive motor, it is to be electrically connected to the drive motor by three terminals.

The inverter 100 includes a printed circuit board (PCB) on which various circuit elements are mounted and other connection wires. More specifically, the circuit element may include a low power element that requires less power when driving an inverter, and Compared to a low power device, it can be divided into a high power device that requires relatively high power.

The low power device may include an MCU including an IC in which an inverter operation program is stored, and the high power device may include an inductor and an input capacitor.

1 to 4, in the embodiment of the present invention, the inverter 100 includes a main board 110 and a bus bar assembly 120.

The main board 110 is a printed circuit board for supplying power and a signal to the drive motor to rotate the rotational axis of the drive motor and to adjust the rotational speed thereof variably. The main board 110 and the drive motor are inverters. It is electrically connected through the three terminals 130 provided on one side of the housing 190.

In the main board 110, various circuit elements including the aforementioned low power device are self-inserted and inserted.

On the other hand, as shown in Figure 4, the insulating layer 111 is additionally attached to the bottom surface of the main board 110 to insulate the main board 110 with respect to the peripheral configuration such as the bus bar assembly 120 to be described later The insulating layer 111 may be applied as a varnish made of any one of epoxy, formalin, and silicon.

In addition, the main board 110 may be fixed by coupling a bolt to the fastening hole 191 formed on the bottom surface of the inverter housing 190.

Meanwhile, the bus bar assembly 120 includes a bus bar 121 to which power is input from the outside and an insulator 122 surrounding the bus bar 121.

That is, the plurality of bus bars 121 for power supply are installed in the insulator 122 to be spaced apart from each other to prevent a short from occurring. Therefore, the insulator 122 is used for applying power to a high power device. It has an effect that can aggregate a plurality of bus bars 121.

In addition, the insulator 122 is preferably made of a material such as plastic synthetic resin that does not melt by the heat generated from the bus bar 121.

In addition, high-power devices such as capacitor C and inductor I are inserted or inserted into the insulator 122 so as to be connected to the bus bar 121.

On the other hand, the entire high-power device mounted on the insulator 122 may be molded in a separate resin for the insulation.

In more detail with respect to the insulator 122, the insulator 122 includes a base portion 124 and a bent portion 125.

As shown in FIG. 2, when looking at the bottom of the inverter housing 190, the base portion 124 is formed in a substantially '-' shape, and one end is supplied with power to the bus bar 121. A power input terminal 126 connected to an external power cable is provided.

On the other hand, the bent portion 125 is bent upward from the other end of the base portion 124.

The bus bar 121 may be exposed on the upper surface of the bent portion 125 for electrical connection with the main board 110.

However, the present disclosure is not limited thereto, and the bus bar assembly may include a connection pin 127 connected to the bus bar 121 at the base 124 and a connection pin 127 and the main board 110. The external power applied to the 120 may be transferred to the main board 110 through the connection pin 127.

In FIG. 2, the inductor I is mounted on the base part 124, and the capacitor C is mounted on the bent part 125, but the mounting position is not necessarily limited.

In addition, the chamfer 128 may be formed in the base 124 with the edge of the inverter housing 190 interposed therebetween so as to facilitate mounting into the inverter housing 190.

In an embodiment of the invention, as shown in FIGS. 3 and 4, the busbar assembly 120 has an inner bottom of the inverter housing 190 for dissipating heat generated from the inductor I and the capacitor C. FIG. It is preferable to be fixed to face.

Specifically, the bus bar assembly 120 may be in close contact with the inner bottom surface of the inverter housing 190 to cool the high power device having a relatively high heat generation more efficiently than the low power device mounted on the main board 110. .

That is, by allowing the low temperature heat formed on the suction passage 200 to be directly conducted to the bus bar assembly 120 via the compressor housing 170, the cooling effect can be increased while suppressing the sustained high temperature heat generation of the high power device. .

In addition, the above-described cooling effect may be further enhanced by bringing the busbar assembly 120 into contact with the inner surface of the inverter housing 190 to increase the contact area through which the low temperature heat of the low temperature refrigerant is transferred.

Meanwhile, a compound 123 may be additionally attached to the bottom of the bus bar assembly 120 to improve insulation performance.

Of course, in this case, the compound 123 needs to have excellent thermal conductivity.

Although the preferred embodiments of the present invention have been described above, the scope of the present invention is not limited to such specific embodiments, and those skilled in the art may appropriately change within the scope described in the claims of the present invention. Or modifications may be possible.

1 is a schematic cross-sectional view showing an electric compressor equipped with an inverter according to an embodiment of the present invention.

2 is an exploded perspective view showing an electric compressor equipped with an inverter according to an embodiment of the present invention.

3 is a plan view showing a part of an open state of the cover in FIG.

4 is a cross-sectional view taken along the line II of FIG. 3.

*** Explanation of symbols for the main parts of the drawing ***

100: inverter 110: main board

111: insulating layer 120: busbar assembly

121: busbar 122: insulator

123: compound 124: base portion

125: bend portion 126: power input terminal

127: connecting pin 128: chamfer

130: terminal 150: compression unit

160: drive unit 170: compressor housing

180: cover 190: inverter housing

191: fastening hole 200: suction flow path

C: Condenser I: Inductor

Claims (6)

In the electric compressor equipped with an inverter for variably adjusting the rotational speed of the compressor drive motor in the inverter housing formed on one side of the compressor housing, The inverter, An upper main board for supplying power to the drive motor; A lower busbar assembly including a bus bar electrically connected to the main board and an insulator surrounding the bus bar; A low power device mounted on the main board; And And a high power device mounted on the insulator so as to be connected to the bus bar, wherein the high power device takes a relatively high power compared to the low power device. The method of claim 1, The bus bar assembly is fixed in contact with the inner bottom surface of the inverter housing, the electric compressor equipped with an inverter, characterized in that the suction refrigerant passes under the bottom of the inverter housing. The method of claim 1, And the busbar assembly is fixed in contact with the inner surface of the inverter housing. The method of claim 2, An electric compressor equipped with an inverter, characterized in that a compound is attached to the bottom of the bus bar assembly. The method according to any one of claims 1 to 3, The insulator is, A base unit having a power input terminal for supplying external power to the bus bar at one end thereof; And a bent portion bent upward from the other end of the base portion. The method of claim 5, The base portion is formed with a chamfer between the edge of the inverter housing, And the main board and the bus bar assembly are electrically connected to each other by a connection pin provided to be connected with the bus bar to the chamfer, or a bus bar protruding from the upper surface of the bent portion.

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