JP2019007365A - Electric compressor and its manufacturing method - Google Patents

Abstract

To provide an electric compressor which can prevent the movement and the loosening of a cluster block to an axial direction, or can improve assembling performance, and its manufacturing method.SOLUTION: An electric compressor comprises: a refrigerant compression mechanism 3; an electric motor 5 for driving the compression mechanism; an electric motor drive circuit 9; and a hermetic terminal 21 (21A to 21C) which is mounted to the drive circuit, and in which a lead wire 17 connected to a stator coil 5d of the electric motor is connected to a tip of the electric motor which is exposed in an accommodation space 7d of the electric motor via a cluster block 19 (19A to 19C). The cluster block is arranged inside a radial direction rather than the stator coil, and the cluster block accommodation part for accommodating the cluster block has a receiving part 501 abutting on an end part 500 of the cluster block at the motor side in a motor axial direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a compressor for a refrigeration cycle that compresses a refrigerant, and more particularly, to an electric compressor using an electric motor as a power source and a manufacturing method thereof.

  The electric compressor includes a compression unit that compresses and discharges the refrigerant, an electric motor that is a drive source of the compression unit, and a motor drive circuit that drives the electric motor.

  In addition, the conductive terminal used to electrically connect the motor drive circuit and the electric motor and the lead wire drawn out from the electric motor are electrically connected via the connection terminal in the cluster block provided in the housing. (For example, refer to Patent Document 1).

JP 2001-295765 A

  By the way, in the electric compressor which concerns on the said prior art, the cluster block arrange | positioned inside a stator coil was being fixed by the fitting to an accommodating part.

  For this reason, there is a problem that the cluster block moves in the axial direction in the accommodating portion due to vibration of the electric motor or the like.

  In addition, when the cluster block is loosened in the accommodating portion, the cluster block may fall out of the accommodating portion.

  Furthermore, in order to suppress the movement and loosening of the cluster block in the axial direction, when increasing the terminal fitting force in the accommodating part, there is a possibility that an excessive force is applied to the glass part of the hermetic terminal at the time of assembly to cause a defect. .

  Further, when the fitting force to the cluster block is increased, a considerable force is required for press-fitting the cluster block into the terminal accommodating portion, and there is a disadvantage that the assembling property is also lowered.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an electric compressor capable of preventing movement and loosening of cluster blocks in the axial direction and improving assemblability, and a method for manufacturing the same. And

  To achieve the above object, an electric compressor according to the present invention is mounted on a refrigerant compression mechanism, an electric motor that drives the compression mechanism, a drive circuit for the electric motor, and the drive circuit. And a hermetic terminal to which a lead wire connected to the stator coil of the electric motor is connected via a cluster block at a tip exposed in the accommodation space, and the cluster block is radially inward of the stator coil. The gist of the cluster block storage portion that is disposed and that stores the cluster block has a receiving portion that abuts the end of the cluster block in the motor axial direction on the motor side.

  The method for manufacturing an electric compressor according to the present invention includes a step of fixing a motor stator to the motor housing, a step of installing the cluster block in the cluster block accommodating portion through the opening, and a step of attaching the cluster block to the cluster block. And a step of attaching the hermetic terminal.

  ADVANTAGE OF THE INVENTION According to this invention, the movement and loosening to the axial direction of a cluster block can be prevented, and the electric compressor which can improve assembly property, and its manufacturing method can be provided.

It is a front sectional view showing an electric compressor according to a comparative example. It is a side view of the motor case of the electric compressor which concerns on a comparative example. It is a front sectional view showing a main part of the electric compressor according to the present embodiment. It is the front sectional view which cut | disconnected the electric compressor shown in FIG. 3 by the EE line. FIG. 4 is an F arrow view of a main part of the electric compressor shown in FIG. 3. It is process drawing which shows the assembly process of the electric compressor which concerns on this Embodiment. FIG. 7 is a process diagram illustrating a continuation of the process illustrated in FIG. 6. FIG. 8 is a process diagram illustrating a continuation of the process illustrated in FIG. 7. FIG. 9 is a process diagram illustrating a continuation of the process illustrated in FIG. 8. It is explanatory drawing which shows the allowable line of the liquid refrigerant in the electric compressor which concerns on this Embodiment.

  Hereinafter, an electric compressor 100 according to a comparative example and an electric compressor 1 according to an embodiment of the present invention will be described with reference to the drawings.

(Electric compressor according to comparative example)
An electric compressor 100 according to a comparative example will be described with reference to the drawings. FIG. 1 is a front sectional view showing an electric compressor 100 according to a comparative example, and FIG. 2 is a side view of a motor case 11 of the electric compressor 100 according to the comparative example.

  An electric compressor 100 according to the comparative example shown in FIG. 1 accommodates a compression mechanism 3, an electric motor 5, an inverter circuit 9 that is a drive circuit for the electric motor 5, a compression mechanism 3, the electric motor 5, an inverter circuit 9, and the like. And a housing 7.

  The compression mechanism 3 includes a pair of side blocks 3a and 3b, a cylinder block 3c sandwiched between them, and a columnar rotor 3e accommodated in an elliptical cylinder chamber 3d formed inside the cylinder block 3c. doing. A plurality of vanes (not shown) are supported on the peripheral surface of the rotor 3e so as to appear and retract.

  When the rotor 3e is rotated in the cylinder chamber 3d by the electric motor 5, each vane of the rotor 3e appears and disappears following the inner peripheral surface of the cylinder chamber 3d, and the two vanes adjacent to the rotor 3e and the cylinder chamber 3d The volume of the configured space changes. Then, while the space volume increases, low-pressure refrigerant is sucked through a suction port (not shown) formed in the side block 3a, and the sucked refrigerant is compressed as the space volume decreases. The compressed high-pressure refrigerant is discharged from a discharge port (not shown) formed in the side block 3b.

  The housing 7 is formed of, for example, an aluminum die cast material, and includes a motor case 11 and a compressor case 13 that are fastened by bolts 15.

  The compressor case 13 has a cylindrical shape with one end closed. The compressor case 13 accommodates the compression mechanism 3 through the opening 13a, and a discharge chamber 7a sealed inside the compressor case 13 by the side block 3b of the accommodated compression mechanism 3 and the bottom of the compressor case 13 is provided. Is formed.

  The motor case 11 includes a partition wall 11c that includes a motor housing portion 11a that closes the opening 13a of the compressor case 13 and forms a suction chamber 7b therein, and a circuit housing portion 11b that forms a housing space 11d of the inverter circuit 9 inside. Are integrally connected. The suction chamber 7b and the accommodation space 11d of the inverter circuit 9 are partitioned by a partition wall 11c.

  The motor housing portion 11a has a bottomed cylindrical shape with the partition wall 11c as a bottom portion. An annular stator 5c of the electric motor 5 housed in the suction chamber 7b is attached to the inner peripheral surface 11e of the motor housing portion 11a by shrink fitting. A cylindrical rotor 5b is accommodated inside the stator 5c, and the rotating shaft 5a penetrating the rotation center of the rotor 5b is integrated with the rotor 3e of the compression mechanism 3 and is supported by a pair of side blocks 3a and 3b. ing.

  A cluster block 19 is caulked and connected to the tip of the lead wire 17 from the stator coil 5d wound around the stator 5c.

  The circuit accommodating portion 11b has a bottomed cylindrical shape with the partition wall 11c as a bottom portion. A plurality of mounting bosses (not shown) are erected on the peripheral edge portion of the partition wall 11c toward the circuit housing portion 11b, and the circuit of the inverter circuit 9 is provided on the inner side of each mounting boss in the circuit housing portion 11b. The board 9a is fixed with screws.

  On the circuit board 9a, a power switching element 9b such as an IGBT or a MOSFET constituting the inverter circuit 9 is mounted. The casing of the circuit board 9a is provided on the side of the circuit accommodating portion 11b of the partition wall 11c in order to improve the heat radiation efficiency. The surface is in surface contact. The circuit housing portion 11b is sealed by a cap 11g attached to the opening 11f.

  A terminal 9c is mounted on the circuit board 9a, and a base end 21a of the hermetic terminal 21 is press-fitted into the terminal 9c.

  The distal end 21b of the hermetic terminal 21 penetrates the partition wall 11c and is exposed to the motor accommodating portion 11a side, and is a terminal accommodating portion (cluster) formed at a substantially central portion of the partition wall 11c facing the distal end of the rotating shaft 5a. It is arranged inside the block housing portion) 11h.

  The cluster block 19 at the tip of the lead wire 17 is inserted into the terminal housing portion 11h, and the cluster block 19 is connected to the tip 21b of the hermetic terminal 21 in the terminal housing portion 11h.

  Thereby, the cluster block 19 is arranged together with the hermetic terminal 21 on the center side of the motor case 11 with respect to the stator 5c. A part of the cluster block 19 is arranged inside the stator 5c with respect to the stator coil 5d.

  As shown in FIG. 2, three lead wires 17 and hermetic terminals 21 are provided corresponding to the phases U, V, and W of the electric motor 5, and three terminals 9c of the circuit board 9a are also provided. ing.

  Here, in the electric compressor 100 according to the comparative example, the cluster block 19 is fitted into the terminal accommodating portion 11 h and fixed by filling the resin 300.

  However, in the electric compressor 100 according to the comparative example, the cluster block 19 is not provided with a retaining structure for preventing the cluster block 19 from coming off from the terminal accommodating portion 11h in the axial direction (A direction).

  Therefore, when the cluster block 19 is loosened in the terminal accommodating portion 11h due to vibration of the electric motor 5 or the like and is displaced in the A direction, various problems may occur.

  That is, there is a possibility that the terminals provided in the cluster block 19 are loosened and the contact resistance increases. Further, when the fitting force with respect to the cluster block 19 is increased in order to suppress loosening, an excessive force is applied to the insulating portion (glass portion) of the hermetic terminal 21 at the time of assembling, which may cause a defect such as a defect. There is. Furthermore, when the fitting force with respect to the cluster block 19 is increased, a considerable force is required for press-fitting the cluster block 19 into the terminal accommodating portion 11h, and there is also a disadvantage that the assembling property is lowered.

(Electric compressor according to the embodiment)
With reference to FIGS. 3-5, the structural example of the electric compressor 1 which concerns on this Embodiment is demonstrated.

  In addition, about the structure similar to the electric compressor 100 which concerns on the above-mentioned comparative example, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  Here, FIG. 3 is a front sectional view showing an essential part of the electric compressor 1 according to the present embodiment, FIG. 4 is a front sectional view of the electric compressor 1 shown in FIG. 3 cut along the line EE, FIG. These are F arrow views of the principal part of the electric compressor 1 shown in FIG.

  The main difference between the electric compressor 1 according to the present embodiment and the electric compressor 100 according to the comparative example is that, in the terminal accommodating portion 11h, the end portion 500 of the cluster block 19 and the receiving portion (wall portion) of the terminal accommodating portion 11h. ) 501 prevents the cluster block 19 from moving in the axial direction.

  Further, the positioning of the cluster block 19 at the time of assembling is performed by providing positioning means comprising a convex portion 19a formed at the end portion 500 of the cluster block 19 and a concave portion 111a for supporting the convex portion 19a on the receiving portion 501. Can do.

  More specifically, on the end 500 side of the cluster block 19, the wall 111 constituting the receiving portion 501 that comes into contact with the end 500 is raised.

  Here, in the electric compressor 1 according to the present embodiment, as shown in FIGS. 4 and 5, three hermetic terminals 21 </ b> A, 21 </ b> B, 21 </ b> C are associated with the U, V, W phases of the electric motor 5. Is provided.

  And in the structural example shown in FIG. 4, the convex part 19a is formed in the two edge parts 500 of the cluster blocks 19A and 19C of the hermetic terminal 21A and 21C located in both ends, and the wall part which comprises the receiving part 501 A recess 111 a is provided at a corresponding portion of 111.

  With such a configuration, the end portion 500 at the position where the cluster block 19 is installed and the receiving portion 501 of the terminal accommodating portion 11h come into contact with each other, and the movement of the cluster block 19 in the axial direction can be prevented.

  Further, by engaging the convex portion 19a of the cluster block 19 with the concave portion 111a on the receiving portion 501 side, the positioning of the cluster block 19 in the terminal accommodating portion 11h can be easily performed, and the assemblability can be improved. it can.

  Further, the engagement between the concave portion 111a and the convex portion 19a of the cluster block 19 prevents the cluster blocks 19A to 19C from vibrating and loosening in the terminal accommodating portion 11h due to vibration of the electric motor 5 or the like. be able to.

  Therefore, it is possible to avoid a situation in which the contact resistance is increased due to loosening of the terminals of the cluster block 19 as in the electric compressor 100 according to the comparative example.

  Further, according to the electric compressor 1 according to the present embodiment, since it is not necessary to increase the fitting force with respect to the cluster block 19 in order to suppress loosening of the cluster block 19, the attachment of the cluster block 19 to the terminal accommodating portion 11h. Can be carried out smoothly, and the assemblability can be improved.

  As shown in FIGS. 3 and 4, in the electric compressor 1 according to the present embodiment, the hermetic terminal 21 (21A to 21C) is fixed to the groove 201 formed in the partition wall 11c. This is done by the ring 200. Accordingly, the hermetic terminal 21 can be smoothly attached to the terminal accommodating portion 11h from the direction D2, and the hermetic terminal 21 can be securely fixed by the insertion of the C-ring 200.

  In addition, in FIG. 3 etc., the code | symbol 121 is a glass part as an insulating member.

  Moreover, as shown in FIGS. 3-5, the terminal accommodating part (cluster block accommodating part) 11h has the opening part 160 which can insert the cluster block 19 from the accommodating space 7b side of the electric motor 5, and the cluster block in an installation state. 19 is formed on the upper side.

  Thereby, since the cluster block 19 can be accommodated in the terminal accommodating part 11h via the opening part 160, an assembly property can be improved. Further, the allowable amount of the liquid refrigerant can be increased by setting the connection position of the terminal accommodating portion 11h to the motor accommodating space as high as possible (see FIG. 10 described later).

  The opening 160 is formed across the circumferential wall 112 and the axial end wall 111 of the terminal housing (cluster block housing) 11h. The opening 160 having such a configuration can be manufactured at a reduced cost because it can be formed integrally with other components by die cutting with a mold.

  The motor housing 11a that houses the electric motor 5 has a bottomed cylindrical shape, the motor housing 11a has an opening on the compression mechanism 3 side, and the hermetic terminal 21 is provided at the bottom of the motor housing 11a. (See FIG. 1 etc.). With such a configuration, the hermetic terminal 21 can be installed even after the electric motor 5 is fixed to the motor housing 11a, and assemblability can be improved.

(Method for Manufacturing Electric Compressor According to Embodiment)
An example of a method for manufacturing the electric compressor 1 according to the present embodiment will be described with reference to the process diagrams of FIGS.

  In addition, about the same part as the structure of the electric compressor 1 shown in FIGS. 3-5, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  6 to 9, the cluster block 19B located in the center in FIGS. 4 and 5 will be described as an example.

  First, in the process illustrated in FIG. 6, the cluster block 19 (19 </ b> B) is housed by being lowered from the direction D <b> 1 through the opening 160 in the housing space 7 b of the terminal housing portion 11 h.

  Then, as shown in FIG. 7, the end portion 500 of the cluster block 19B is brought into contact with the receiving portion 501 on the wall 111 side. Thereby, the movement of the cluster block 19 (19B) in the axial direction is prevented.

  Although not shown, the convex portion 19a of the end portion 500 of the cluster block 19 (19A, 19C) is engaged with the concave portion 111a of the wall portion 111. As a result, alignment of the cluster blocks 19 (19A to 19C) is performed, and vibrations in the circumferential direction of the cluster blocks 19 (19A to 19C) are suppressed and loosening is prevented.

  Next, as shown in FIG. 8, the hermetic terminal 21 (21B) is inserted into the terminal accommodating portion 11h from the direction D2, and the tip portion 21b is inserted into the cluster block 19 (19B).

  Similarly, the other hermetic terminals 21A and 21C are inserted into the terminal accommodating portion 11h from the direction D2, and the tip end portion 21b is inserted into the cluster blocks 19A and 19C.

  Next, as shown in FIG. 9, the C-ring 200 is fitted into the groove 201 formed in the partition wall 11c. Thereby, the hermetic terminal 21 can be reliably fixed.

  Further, the rotating shaft 5a is inserted from the D3 direction. Thus, electric compressor 1 concerning this embodiment is assembled.

  According to the electric compressor 1 having such a configuration, the liquid refrigerant allowable line L2 can be set higher than the conventional allowable line L1 as a secondary effect of forming the wall 111.

  Thereby, it can suppress more effectively that a liquid refrigerant leaks in D4 direction.

  Although the invention made by the present inventor has been specifically described based on the embodiments, the embodiments disclosed herein are illustrative in all respects and are not limited to the disclosed technology. Should not be considered. That is, the technical scope of the present invention should not be construed restrictively based on the description in the above embodiment, but should be construed according to the description of the scope of claims. All the modifications within the scope of the claims and the equivalent technique to the described technique are included.

DESCRIPTION OF SYMBOLS 1,100 ... Electric compressor 3 ... Compression mechanism 3a, 3b ... Side block 3c ... Cylinder block 3d ... Cylinder chamber 3e, 5b ... Rotor 5 ... Electric motor 5a ... Rotating shaft 5c ... Stator 5d ... Stator coil 7 ... Housing 7a ... Discharge Chamber 7b ... Suction chamber (accommodating space for electric motor)
9 ... Inverter circuit (drive circuit)
DESCRIPTION OF SYMBOLS 9a ... Circuit board 9b ... Electric power switching element 9c ... Terminal 11 ... Motor case 11a ... Motor accommodating part (motor housing)
11b: Circuit housing part (circuit housing)
11c: Partition wall 11d: Inverter circuit housing space 11e: Inner peripheral surface of motor housing section 11f: Circuit housing section opening 11g: Cap 11h: Terminal housing section (cluster block housing section)
DESCRIPTION OF SYMBOLS 13 ... Compressor case 13a ... Compressor case opening 17 ... Lead wire 19 (19A-19C) ... Cluster block 19a ... End part (convex part)
21 (21A-21C) ... Hermetic terminal 21a ... Hermetic terminal base end 21b ... Hermetic terminal tip 23 ... Resin material (insulation coating material)
111 ... Axial end wall portion 112 ... Wall portion (circumferential wall portion)
111a ... receiving part (concave part)
160 ... opening 200 ... C-ring 201 ... groove 500 ... end 501 ... receiving part

Claims (7)

A refrigerant compression mechanism;
An electric motor for driving the compression mechanism;
A drive circuit for the electric motor;
A hermetic terminal, which is mounted on the drive circuit and is connected to a leading end exposed in the accommodation space of the electric motor via a cluster block connected to a stator coil of the electric motor;
With
The cluster block is disposed radially inward of the stator coil,
The cluster block storage portion for storing the cluster block has a receiving portion that abuts against an end portion of the cluster block on the motor side in the motor axial direction. A convex portion is formed at the end portion of the cluster block, and a concave portion engageable with the convex portion is formed at the receiving portion,
The electric compressor according to claim 1, wherein the convex portion and the concave portion constitute positioning means for the cluster block with respect to the cluster block storage portion.   2. The cluster block storage portion according to claim 1, wherein an opening into which the cluster block can be inserted from the storage space side of the electric motor is formed above the cluster block in the installed state. Item 3. The electric compressor according to Item 2.   The electric compressor according to claim 3, wherein the opening is formed across a circumferential wall portion and an axial end wall portion of the cluster block storage portion. The motor housing that houses the electric motor has a bottomed cylindrical shape,
The motor housing has an opening on the compression mechanism side,
The electric compressor according to any one of claims 1 to 4, wherein the hermetic terminal is provided at a bottom portion of the motor housing. It is a manufacturing method of the electric compressor according to claim 5,
Fixing a motor stator to the motor housing;
Installing the cluster block in the cluster block housing through the opening;
Attaching the hermetic terminal to the cluster block;
The manufacturing method of the electric compressor characterized by having.   When the cluster block is installed in the cluster block housing portion, a step of engaging and positioning a convex portion formed at the end of the cluster block into the concave portion on the receiving portion side constituting the positioning means. The method of manufacturing an electric compressor according to claim 6, further comprising:

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