CN115459511A

CN115459511A - Fixing structure of motor junction box

Info

Publication number: CN115459511A
Application number: CN202211227183.1A
Authority: CN
Inventors: 刘小艺
Original assignee: Dalian Xuanke Air Conditioning Compressor Co ltd
Current assignee: Dalian Xuanke Air Conditioning Compressor Co ltd
Priority date: 2022-10-09
Filing date: 2022-10-09
Publication date: 2022-12-09

Abstract

The invention discloses a fixing structure of a motor junction box.A stator comprises an insulating cover, wherein a first axial bulge part and a second axial bulge part are axially arranged at the edge of one end of the insulating cover, and the first axial bulge part and the second axial bulge part are positioned on the same arc; the junction box comprises a hole IV, a hole V, a hole VI, a mounting hole I and a mounting hole II, wherein the axial bulge I is inserted into the mounting hole I, a circumferential gap between the axial bulge I and the mounting hole is delta L, a radial gap between the axial bulge I and the mounting hole is delta r, the delta L is more than 1.5 delta r, the axial bulge II is inserted into the mounting hole II, and the gap relation between the axial bulge II and the mounting hole II is the same as the gap relation between the axial bulge I and the mounting hole I. The invention ensures that no acting force is applied to the sealing terminal even if the circumferential position precision of the stator is low, and can ensure the smooth connection of the motor and the frequency converter. Thus, the motor-driven compressor is reduced in weight, and the reliability of the motor-driven compressor is improved without applying pressure to the seal terminal.

Description

Fixing structure of motor junction box

Technical Field

The invention relates to the technical field of motors, in particular to a fixing structure of a motor junction box.

Background

The motor is typically fixed in the manner shown in fig. 6. Six bolt holes are formed in the stator 6, and the stator 6 is fixed in the axial direction and the circumferential direction through the six bolt holes by 6 bolts. The first axial convex part 604 and the second axial convex part 605 are arranged in the axial direction of the insulating sleeve 601 of the stator 6, and are respectively inserted into the first mounting hole 704 and the second mounting hole 705 which are arranged on the junction box 7 to fix the junction box 7. The relative relationship of the first axial projection 604, the second axial projection 605, and the first mounting hole 704 and the second mounting hole 705 is described with reference to FIG. 7. The circumferential lengths of the first mounting hole 704 and the second mounting hole 705 are L704 and L705 respectively; the circumferential lengths of the first axial projection 604 and the second axial projection 605 are L604 and L605 respectively. The circumferential gap between the axial protrusions and the mounting holes is substantially equal to the difference of the arc length, i.e. the gap is about equal to L704-L604 about L705-L605.

Such a connection method requires high positional accuracy of the stator 6 with respect to the housing, and when the positional accuracy is low, the position of the hole of the terminal box 7 and the terminal portion to which the sealed terminal of the inverter is connected are displaced, and the terminal cannot be inserted into the hole, or a force is applied to the sealed terminal at the time of insertion, and the sealed terminal is broken, causing failure modes such as leakage of electricity.

Disclosure of Invention

The present invention provides a fixing structure of a motor junction box to solve the above problems.

In order to solve the technical problems, the technical scheme of the invention is as follows: a fixing structure of a motor junction box comprises a stator, a junction box, a sealing terminal, a frequency converter substrate and a rotor, wherein the rotor is arranged in the stator, and the stator, the junction box, the sealing terminal and the frequency converter substrate are sequentially connected; the stator comprises an insulating cover, wherein a first axial bulge part and a second axial bulge part are axially arranged at the edge of one end of the insulating cover, and the first axial bulge part and the second axial bulge part are positioned on the same arc; the junction box comprises a fourth hole, a fifth hole, a sixth hole, a first mounting hole and a second mounting hole, wherein the first axial bulge is inserted into the first mounting hole, a circumferential gap between the first axial bulge and the first mounting hole is delta L, a radial gap between the first axial bulge and the first mounting hole is delta r, the delta L is larger than 1.5 delta r, the second axial bulge is inserted into the second mounting hole, and the gap relation between the second axial bulge and the second mounting hole is the gap relation between the first axial bulge and the first mounting hole.

Furthermore, the sealing terminal comprises a sealing plate, the sealing plate is internally provided with a terminal in a sealing manner through a glass body, and the soldering lug I, the soldering lug II and the soldering lug III are respectively fixed on the three terminals; the three terminals are respectively inserted into the hole four, the hole five and the hole six.

Furthermore, the frequency converter substrate comprises a first hole, a second hole and a third hole, and the first hole, the second hole and the third hole are respectively connected with the first soldering lug, the second soldering lug and the third soldering lug.

The invention ensures that even if the circumferential position precision of the stator is low, acting force is not applied to the sealing terminal, and the smooth connection between the motor and the frequency converter can be ensured. Therefore, the weight of the electric compressor is reduced without using bolts or providing a boss on the stator, and the reliability of the electric compressor is improved without applying pressure to the seal terminal.

Drawings

FIG. 1 is a cross-sectional view of the structure of the present invention;

FIG. 2 is a schematic diagram of a transducer substrate;

FIG. 3 is a schematic view of a hermetic terminal;

FIG. 4 is a schematic view of a stator;

FIG. 5 is a relative positional relationship diagram;

FIG. 6 is a schematic view showing a connection mode of related parts of the background art;

FIG. 7 is a prior art axial boss and mounting hole relationship diagram.

Wherein: 1-a shell; 101-an air inlet; 2-end cap; 201-an exhaust port; 3-fixed scroll; 4-a rotating scroll; 5-a main shaft; 6-a stator; 601-an insulating cover; 604-axial lobe one; 605-axial boss two; 7-a junction box; 701-hole four; 702-hole five; 703-hole six; 704-mounting hole one; 705-mounting hole two; 8-a hermetic terminal; 801-soldering lug one; 802-bonding pad two; 803-soldering lug three; 804-sealing plate; 805-terminals; 806-vitreous body; 9-a transducer substrate; 901-hole one; 902-hole two; 903-hole three; 10-rotor.

Detailed Description

The following further describes embodiments of the present invention with reference to fig. 1-5.

A fixing structure of a motor junction box comprises a stator 6, a junction box 7, a sealing terminal 8, a frequency converter substrate 9 and a rotor 10, wherein the rotor 10 is installed in the stator 6, and the stator 6, the junction box 7, the sealing terminal 8 and the frequency converter substrate 9 are sequentially connected; the stator 6 comprises an insulating cover 601, a first axial bulge 604 and a second axial bulge 605 are axially arranged at one end edge of the insulating cover 601, and the first axial bulge 604 and the second axial bulge 605 are positioned on the same circular arc; the junction box 7 comprises four holes 701, kong Wu, six holes 703, a first mounting hole 704 and a second mounting hole 705, the first axial bulge 604 is inserted into the first mounting hole 704, the circumferential gap between the first axial bulge 604 and the first mounting hole 704 is delta L, the radial gap between the first axial bulge 604 and the first mounting hole 704 is delta r, the delta L is larger than 1.5 delta r, the second axial bulge 605 is inserted into the second mounting hole 705, and the gap relation between the second axial bulge 605 and the second mounting hole 705 is the gap relation between the first axial bulge 604 and the first mounting hole 704. The sealed terminal 8 comprises a sealing plate 804, a terminal 805 is hermetically mounted in the sealing plate 804 through a glass body 806, and a first soldering lug 801, a second soldering lug 802 and a third soldering lug 803 are respectively fixed on the three terminals 805; three terminals 805 are inserted into holes four 701, kong Wu, and six 703, respectively. The frequency converter substrate 9 includes a first hole 901, a second hole 902, and a third hole 903, and the first hole 901, the second hole 902, and the third hole 903 are respectively connected to the first bonding pad 801, the second bonding pad 802, and the third bonding pad 803.

The cylindrical housing 1 that houses the stator 6 is provided with an air inlet 101 that sucks in a refrigerant. The housing 1 and the stator 6 are fixed to each other by shrink fitting using the thermal expansion properties of the materials. The main shaft 5 is press-fitted into the rotor 10, and both ends thereof are supported by two bearings to rotate, and one end of the main shaft 5 is mounted on the rotary scroll 4. Engaged with the rotary scroll 4 is a fixed scroll 3. When the main shaft 5 rotates, the rotary scroll 4 compresses the refrigerant sucked from the inlet port 101 into the head cover 2 by a revolution motion. The end cover 2 is provided with an exhaust port 201, and the refrigerant discharged from the fixed scroll 3 enters the air conditioning system through the exhaust port 201. The opposite side of the main shaft 5 is provided with a frequency converter assembly which drives the rotor 10 to move.

The inverter module is provided with an inverter board 9 for control. The frequency converter substrate 9 and the sealing terminal 8 are connected and electrified, and the sealing terminal 8 and the stator 6 are connected and electrified through the junction box 7 in the axial direction.

The first hole 901, the second hole 902 and the third hole 903 connected to the hermetic terminal 8 are formed in the inverter board 9. The first hole 901, the second hole 902, and the third hole 903 are connected to the first tab 801, the second tab 802, and the third tab 803 on the hermetic terminal 8, respectively, and the hermetic terminal 8 is fixed on the inverter board 9 by soldering or the like.

A sealing plate 804 for sealing the terminal 8 is provided with a circular hole through which the columnar terminal 805 is inserted, and a sealing glass 806 is provided to prevent short-circuiting between the terminals 805. The sealing plate 804 is connected to the case for fixing the inverter board 9 by a sealing member such as a gasket.

On the junction box 7 connected to the stator 6, there are provided a hole four 701, a hole five 702, and a hole six 703 connected to the terminal 805 of the hermetic terminal 8. The first hole 901-the first soldering lug 801-the fourth hole 701, the second hole 902-the second soldering lug 802-the fifth hole 702 and the third hole 903-the third soldering lug 803-the sixth hole 703 are respectively connected in sequence to form an electric path. In order to connect this electrical path, the positions of the inverter board 9 and the junction box 7 are important for the hermetic terminal 8. If the position is deviated, the glass body 806 on the hermetic terminal 8 is broken by an external force when the hole one 901-tab one 801-hole four 701, the hole two 902-tab two 802-hole five 702, and the hole three 903-tab three 803-hole six 703 are connected to each other.

The stator 6 is provided with an insulating cover 601 on the side facing the converter substrate 9. The insulating cover 601 is provided with a first axial projection 604 and a second axial projection 605 in the axial direction. In addition, the first mounting hole 704 and the second mounting hole 705 are arranged on the junction box 7. The first axial projection 604, the second axial projection 605 and the first mounting hole 704, the second mounting hole 705 are connected so that the terminal block 7 is fixed in the axial direction of the stator 6.

The first axial convex part 604 and the second axial convex part 605 of the insulating cover 601 of the stator 6 are distributed on the same circular arc by taking the center of the outer diameter circle of the stator 6 as the center of a circle. When the second axial bulge 605 is inserted into the first mounting hole 704, the second mounting hole 705 and the first axial bulge 604 of the junction box 7, the first mounting hole 704 and the second mounting hole 705 are distributed on the same arc by taking the circle center of the outer diameter of the stator 6 as the circle center; the first axial convex portion 604, the second axial convex portion 605, the first mounting hole 704 and the second mounting hole 705 are all distributed on the same arc, so that the junction box 7 can move in the circumferential direction around the outer diameter center of the stator 6.

In the radial direction, the inner diameter of the first mounting hole 704 is smaller than the inner diameter of the first axial bulge 604, and the outer diameter is larger by a difference Δ r. In the circumferential direction, the size of the first mounting hole 704 is larger than the circumferential size of the first axial bulge 604, the difference between the two is DeltaL, and DeltaL is larger than 1.5 Deltar. Similarly, the second mounting hole 705 and the second axial projection 605 have the above-mentioned clearance relationship.

That is, the movement of the terminal block 7 in the radial direction is limited with respect to the stator 6, while the circumferential direction possesses 1.5 times the degree of freedom in the radial direction. Thus, the terminal block 7 is axially movable with respect to the stator 6, and when the positional accuracy of the stator 6 in the housing 1 is insufficient, the terminal block 7 has a certain degree of freedom, and can be connected to the hermetic terminal 8 without receiving a large external force from the glass body 806.

By adopting the above configuration, the terminal box 7 has a certain degree of freedom in the circumferential direction with respect to the first axial projection 604 and the second axial projection 605 provided on the stator 6, and absorbs the positional accuracy of the stator 6 in the circumferential direction at the time of shrink fitting, thereby enabling smooth connection with the hermetic terminal 8. Further, since the stator 6 is fixed by shrink fitting, it is not necessary to provide a boss portion in the outer diameter direction of the stator 6 by using a bolt, and the weight of the electric compressor is reduced, and the reliability of the electric compressor is improved without applying pressure to the hermetic terminal 8.

The above description has introduced a compression mechanism for compressing a refrigerant by providing a pair of scrolls. However, the configuration of the compression mechanism can provide a corresponding effect regardless of the configuration. In the present embodiment, the stator fixing system is a shrink fit system, but the structure of the present invention can improve the degree of freedom in the circumferential direction of the terminal box and improve the assembling property of the seal terminal even in the bolt fixing system that is generally used. The structure of the present invention is also applicable to other stator fixing methods.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.

Claims

1. A fixing structure of a motor junction box is characterized by comprising a stator (6), a junction box (7), a sealing terminal (8), a frequency converter substrate (9) and a rotor (10), wherein the rotor (10) is installed in the stator (6), and the stator (6), the junction box (7), the sealing terminal (8) and the frequency converter substrate (9) are sequentially connected; the stator (6) comprises an insulating cover (601), a first axial bulge part (604) and a second axial bulge part (605) are arranged at the edge of one end of the insulating cover (601) along the axial direction, and the first axial bulge part (604) and the second axial bulge part (605) are positioned on the same circular arc; the junction box (7) comprises four holes (701), kong Wu (702), six holes (703), a first mounting hole (704) and a second mounting hole (705), wherein the first axial bulge (604) is inserted into the first mounting hole (704), the circumferential gap between the first axial bulge (604) and the first mounting hole (704) is delta L, the radial gap between the first axial bulge (604) and the first mounting hole (704) is delta r, the delta L is larger than 1.5 delta r, the second axial bulge (605) is inserted into the second mounting hole (705), and the gap relation between the second axial bulge (605) and the second mounting hole (705) is the same as the gap relation between the first axial bulge (604) and the first mounting hole (704).

2. The fixing structure of the motor junction box according to claim 1, wherein the sealing terminal (8) comprises a sealing plate (804), the sealing plate (804) is internally provided with a terminal (805) in a sealing way through a glass body (806), and a first soldering lug (801), a second soldering lug (802) and a third soldering lug (803) are respectively fixed on the three terminals (805); the three terminals (805) are inserted into the holes four (701), kong Wu (702), and six (703), respectively.

3. The fixing structure of the motor junction box according to claim 2, wherein the inverter substrate (9) comprises a first hole (901), a second hole (902), and a third hole (903), and the first hole (901), the second hole (902), and the third hole (903) are respectively connected to the first bonding pad (801), the second bonding pad (802), and the third bonding pad (803).