JP5974751B2 - Electric compressor - Google Patents

Description

  The present invention relates to an electric compressor.

  In general, an electric compressor has a housing that houses a compression section that compresses and discharges a refrigerant, and an electric motor that drives the compression section, and one end wall (partition wall) of the housing has a cover that is open on one side. A member is attached. The housing space is defined by the one end wall of the housing and the cover member, and a motor drive circuit for driving the electric motor is housed in the housing space. The electric motor and the motor drive circuit are electrically connected via a terminal unit (airtight terminal) (see, for example, Patent Document 1).

  For example, as shown in FIG. 3, a through hole 80h is formed in one end wall 80a of the housing 80, and a terminal unit 81 is disposed in the through hole 80h. The terminal unit 81 includes a conductive terminal 82 used to electrically connect an electric motor (not shown) and a motor drive circuit (not shown), and holds the conductive terminal 82 via an insulator 83 and a storage space. The holding plate 85 is attached to the one end wall 80a of the housing 80 from the 84 side by a bolt (not shown), and the seal member 86 seals between the holding plate 85 and the one end wall 80a of the housing 80. Yes. The seal member 86 is annular and is disposed so as to surround the through hole 80h.

  Further, a lead wire 87 is drawn out from the electric motor, and the lead wire 87 and the conductive terminal 82 are electrically connected via a connection terminal 88 a in a cluster block 88 provided in the housing 80. Then, the electric power controlled by the motor drive circuit is supplied to the electric motor via the conductive terminal 82, the connection terminal 88a, and the lead wire 87, so that the electric motor is driven and the compression unit (not shown) is driven. It is supposed to be.

JP 2005-180292 A

  Incidentally, for example, in order to prevent foreign matter in the housing 80 from entering between the conductive terminal 82 and the cluster block 88 and short-circuiting the conductive terminal 82 and the housing 80 via the foreign matter, the cluster block 88 is prevented. Is partially inserted into the through hole 80h. According to this, compared with a case where a part of the cluster block 88 is not inserted into the through hole 80 h, foreign matter in the housing 80 is less likely to enter between the conductive terminal 82 and the cluster block 88.

  However, when the through hole 80h is formed in a size that allows a part of the cluster block 88 to be inserted into the through hole 80h, the seal member 86 is disposed so as to surround the through hole 80h. Therefore, the pressure receiving area of the pressure in the housing 80 through the through hole 80h on the inner side of the seal member 86 in the holding plate 85 is increased. As a result, in order to improve the pressure resistance of the holding plate 85, it is necessary to increase the thickness of the holding plate 85. By increasing the thickness of the holding plate 85, the size of the electric compressor increases, There was a problem that the weight of the compressor became heavy.

  The present invention has been made to solve the above-mentioned problems, and the object thereof is to suppress the entry of foreign matter in the housing between the conductive terminals and the cluster block, and the holding plate. It is an object of the present invention to provide an electric compressor capable of minimizing the pressure receiving area of the pressure in the housing through the through hole inside the seal member.

In order to achieve the above object, according to a first aspect of the present invention, a housing includes a cluster block including a compression portion, an electric motor, and a connection terminal electrically connected to a lead wire of the electric motor. And a terminal unit that is provided across the through hole formed in the housing and electrically connects the connection terminal and a motor drive circuit that drives the electric motor, the terminal unit comprising: a holding plate; The holding plate is held via an insulator and electrically connected to the connection terminal and the motor drive circuit, and the holding plate is attached to the outside of the housing with a seal member interposed therebetween. cage, an electric compressor the conductive terminal is inserted into the through hole, the through-hole, through a large opening, the step portion which opens into the housing A small hole portion that communicates with the large hole portion and opens to the outside of the housing, and a part of the cluster block is inserted into the large hole portion, and the seal member includes the small hole portion. The gist is that it is arranged around.

  According to this invention, since a part of the cluster block is inserted through the large hole portion of the through hole, the foreign matter in the housing is smaller than when a part of the cluster block is not inserted into the large hole portion. It is possible to suppress entry between the conductive terminal and the cluster block. Further, since the seal member is disposed around the small hole portion smaller than the large hole portion, the inner diameter of the seal member can be reduced as compared with the case where the small hole portion is not formed in the through hole. . As a result, the pressure receiving area of the pressure in the housing through the through hole on the inner side of the seal member in the holding plate can be minimized.

The gist of the invention described in claim 2 is that, in the invention described in claim 1, a part of the cluster block faces the step portion.
According to this invention, compared with the case where the cluster block does not face the stepped portion, it is possible to easily prevent the foreign matter in the housing from entering between the conductive terminal and the cluster block.

The gist of the invention described in claim 3 is that, in the invention described in claim 1 or 2, a part of the insulator is inserted into the cluster block.
According to the present invention, it is possible to further suppress the foreign matter in the housing from entering between the conductive terminal and the cluster block.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein a plurality of the conductive terminals are provided, and all the conductive terminals can be inserted into the housing. The gist is that one through hole is formed.

According to this invention, a manufacturing process can be simplified compared with the case where one through hole corresponding to each conductive terminal is formed in the housing.
The invention according to claim 5 is the invention according to any one of claims 1 to 3, wherein a plurality of the conductive terminals are provided, and the housing corresponds to each of the conductive terminals. The gist is that the through holes are formed one by one.

  According to the present invention, compared to the case where one through-hole through which each conductive terminal can be inserted is formed in the housing, the strength of the housing is increased because there is a part of the housing between each through-hole in the housing. Can be increased.

  According to the present invention, foreign matter in the housing can be prevented from entering between the conductive terminal and the cluster block, and the inside of the housing via the through hole inside the seal member in the holding plate can be suppressed. The pressure receiving area can be reduced as much as possible.

(A) is the fragmentary sectional view which shows the electric compressor in embodiment, (b) is the longitudinal cross-sectional view which expanded the periphery of the terminal unit. The longitudinal cross-sectional view which expanded the periphery of the terminal unit in another embodiment. The longitudinal cross-sectional view which expanded the periphery of the terminal unit in a prior art example.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIG.
As shown in FIG. 1A, the housing 10a of the electric compressor 10 is formed by joining a bottomed cylindrical suction housing 12 to a left-side covered cylindrical discharge housing 11 in FIG. 1A. Yes. A suction port 13 is formed on the bottom side of the peripheral wall of the suction housing 12 (upper right side in FIG. 1A), and the suction port 13 is connected to an external refrigerant circuit (not shown). A discharge port 14 is formed on the lid side of the discharge housing 11 (left side in FIG. 1A), and the discharge port 14 is connected to an external refrigerant circuit. In the suction housing 12, a compression unit 15 (shown by a broken line in FIG. 1A) for compressing the refrigerant and an electric motor 16 for driving the compression unit 15 are accommodated. In the present embodiment, although not particularly illustrated, the compression unit 15 is composed of a fixed scroll fixed in the suction housing 12 and a movable scroll disposed to face the fixed scroll.

  The electric motor 16 is disposed closer to the end wall 12a (right side in FIG. 1A) of the suction housing 12 than the compression portion 15. The electric motor 16 includes a rotor 18 (rotor) that rotates integrally with the rotary shaft 19, and a stator 17 (stator) that is fixed to the inner peripheral surface of the suction housing 12 so as to surround the rotor 18. Yes. The stator 17 is configured by winding a coil 17 b around a tooth (not shown) of a stator core 17 a fixed to the inner peripheral surface of the suction housing 12. The starting end of the U-phase, V-phase, and W-phase lead wires 20 is drawn out from the coil end of the coil 17b.

  An aluminum cover member 41 is attached to the end wall 12 a of the suction housing 12. An accommodation space 41 a is defined by the end wall 12 a and the cover member 41. A motor drive circuit 40 (indicated by a two-dot chain line in FIG. 1A) is attached to the outer surface of the end wall 12a in the accommodation space 41a. Therefore, in this embodiment, the compression part 15, the electric motor 16, and the motor drive circuit 40 are arrange | positioned along with the axial direction of the rotating shaft 19 in this order.

  As shown in FIG. 1B, one through hole 12 b is formed in the end wall 12 a of the suction housing 12. A terminal unit 42 is disposed in the through hole 12b. The terminal unit 42 is provided so as to straddle the through hole 12b, and includes three conductive terminals 43 used to electrically connect the electric motor 16 and the motor drive circuit 40, and each conductive terminal 43 is made of a glass insulator 44. A metal holding plate 45 that is held via a seal member, and a seal member 46 that seals between the holding plate 45 and the end wall 12a.

  The holding plate 45 is formed with holes 45h through which the respective conductive terminals 43 can pass. An insulator 44 is filled between each conductive terminal 43 and each hole 45h. Each insulator 44 ensures insulation between each conductive terminal 43 and the holding plate 45. Furthermore, the airtightness in the suction housing 12 is maintained by attaching the holding plate 45 to the end wall 12a from the accommodation space 41a side (outside the suction housing 12) with a bolt 47 with the seal member 46 interposed therebetween. . One end of each conductive terminal 43 is electrically connected to the motor drive circuit 40 via a cable 48. The other end of each conductive terminal 43 extends into the suction housing 12.

  The through hole 12b is formed of a large hole portion 122b that opens into the suction housing 12, and a small hole portion 121b that communicates with the large hole portion 122b through the step portion 12f and opens to the outside of the suction housing 12. The small hole portion 121b is formed in a size that allows each conductive terminal 43 and each insulator 44 to be inserted. The seal member 46 is annular and is disposed so as to surround the small hole portion 121b.

  A rectangular box-shaped cluster block 50 is provided in the suction housing 12. Three connection terminals 51 a are included in the cluster block 50. In addition, three insertion holes 511 are formed in the cluster block 50, and the start ends of the lead wires 20 are electrically connected to the connection terminals 51a via the insertion holes 511, respectively. Further, on the side opposite to the insertion hole 511 in the cluster block 50 (on the terminal unit 42 side), three cylindrical portions 512 protrude and the other end of each conductive terminal 43 extends inside the cylindrical portion 512. And electrically connected to each connection terminal 51a.

  A part of each cylindrical part 512 which is a part on the conductive terminal 43 side in the cluster block 50 is inserted into the large hole part 122b. That is, the large hole portion 122b is formed in a size that allows a part of each cylindrical portion 512 to be inserted. In addition, the end surfaces of both cylindrical portions 512 located on both outer sides of the three cylindrical portions 512 are opposed to the stepped portion 12f. Further, a part of each insulator 44 on the cluster block 50 side is inserted inside each cylindrical portion 512 (inside the cluster block 50).

  In the electric compressor 10 having the above-described configuration, the electric power controlled by the motor drive circuit 40 is controlled by being supplied to the electric motor 16 via the cable 48, the conductive terminal 43, the connection terminal 51 a, and the lead wire 20. The rotating shaft 19 is rotated together with the rotor 18 at the rotating speed so that the compression unit 15 is driven. By driving the compression unit 15, the refrigerant is sucked into the suction housing 12 from the external refrigerant circuit through the suction port 13, the refrigerant sucked into the suction housing 12 is compressed by the compression unit 15, and the compressed refrigerant is Discharge to the external refrigerant circuit via the discharge port 14 is performed.

Next, the operation of this embodiment will be described.
Since a part of each cylindrical part 512 which is a part on the conductive terminal 43 side in the cluster block 50 is inserted into the large hole part 122b, each cylindrical part 512 is not inserted into the large hole part 122b. In comparison, the foreign matter in the suction housing 12 is prevented from entering between the conductive terminals 43 and the cluster block 50. In addition, since the end surfaces of the two cylindrical portions 512 located on both outer sides of the three cylindrical portions 512 are opposed to the stepped portion 12f, the end surfaces of the two cylindrical portions 512 are compared with the case where the end surfaces are not opposed to the stepped portion 12f. Thus, it is easy to prevent foreign matter in the suction housing 12 from entering between the conductive terminals 43 and the cluster block 50. Further, since a part of each insulator 44 on the cluster block 50 side is inserted inside each cylindrical portion 512, foreign matter in the suction housing 12 enters between each conductive terminal 43 and the cluster block 50. It is further suppressed.

  Further, since the seal member 46 is disposed around the small hole portion 121b that is smaller than the large hole portion 122b, the inner diameter of the seal member 46 is larger than when the small hole portion 121b is not formed in the through hole 12b. Is getting smaller. Thereby, the pressure receiving area of the pressure in the suction housing 12 through the through hole 12b on the inner side of the seal member 46 in the holding plate 45 is minimized. As a result, it is not necessary to increase the thickness of the holding plate 45 in order to improve the pressure resistance in the holding plate 45, and by increasing the thickness of the holding plate 45, the size of the electric compressor 10 can be increased. It is avoided that the electric compressor 10 becomes heavy.

In the above embodiment, the following effects can be obtained.
(1) The through-hole 12b is formed of a large hole portion 122b that opens into the suction housing 12, and a small hole portion 121b that communicates with the large hole portion 122b through the step portion 12f and opens to the outside of the suction housing 12. . A part of each cylindrical portion 512 of the cluster block 50 was inserted into the large hole portion 122b, and the seal member 46 was disposed around the small hole portion 121b. According to this, since a part of each cylindrical part 512 of the cluster block 50 is inserted into the large hole part 122b, the suction is performed as compared with the case where each cylindrical part 512 is not inserted into the large hole part 122b. It is possible to prevent foreign matter in the housing 12 from entering between the conductive terminals 43 and the cluster block 50. Further, since the seal member 46 is disposed around the small hole portion 121b that is smaller than the large hole portion 122b, the inner diameter of the seal member 46 is larger than when the small hole portion 121b is not formed in the through hole 12b. Can be reduced. As a result, the pressure receiving area of the pressure in the suction housing 12 via the through hole 12b on the inner side of the seal member 46 in the holding plate 45 can be minimized.

  (2) The end surfaces of both cylindrical portions 512 located on both outer sides of the three cylindrical portions 512 are made to face the stepped portion 12f. According to this, compared with the case where the end surfaces of both the cylindrical portions 512 are not opposed to the stepped portion 12 f, it is possible to prevent foreign matter in the suction housing 12 from entering between the conductive terminals 43 and the cluster block 50. Can be made easier.

  (3) A part of each insulator 44 on the cluster block 50 side is inserted inside each cylindrical portion 512. According to this, it is possible to further prevent foreign matters in the suction housing 12 from entering between the conductive terminals 43 and the cluster block 50.

  (4) One through hole 12b through which each conductive terminal 43 can be inserted is formed in the end wall 12a of the suction housing 12. According to this, a manufacturing process can be simplified compared with the case where the through-hole corresponding to each conductive terminal 43 is formed one by one in the end wall 12a.

  (5) One through hole 12b through which each conductive terminal 43 can be inserted is formed in the end wall 12a of the suction housing 12. According to this, one through hole corresponding to each conductive terminal 43 is formed in the end wall 12a, and each conductive terminal 43 is more conductive than the case where each conductive terminal 43 is inserted into each through hole. The insertion work to the through hole 12b in the terminal 43 can be easily performed.

  (6) According to the present embodiment, the pressure receiving area of the pressure in the suction housing 12 through the through hole 12b on the inner side of the seal member 46 in the holding plate 45 can be reduced as much as possible. There is no need to increase the thickness of the holding plate 45 in order to improve pressure resistance. As a result, by increasing the thickness of the holding plate 45, it is possible to avoid an increase in the size of the electric compressor 10 or an increase in the weight of the electric compressor 10.

  (7) The end surfaces of both cylindrical portions 512 located on both outer sides of the three cylindrical portions 512 are made to face the stepped portion 12f. According to this, the movement of the cluster block 50 to the outside of the suction housing 12 can be restricted by the contact between the end surfaces of both the cylindrical portions 512 and the stepped portion 12f.

In addition, you may change the said embodiment as follows.
As shown in FIG. 2, one through hole 62 b corresponding to each conductive terminal 43 may be formed in the end wall 12 a of the suction housing 12. Each through hole 62b is formed of a large hole portion 622b that opens into the suction housing 12, and a small hole portion 621b that communicates with the large hole portion 622b through the stepped portion 62f and opens to the outside of the suction housing 12. . Each small hole portion 621b is formed in a size that allows each conductive terminal 43 and each insulator 44 to be inserted therethrough. The seal member 46 is disposed so as to surround the small hole portion 121b of the through hole 62b located on the outermost side of the three through holes 62b. A part of each cylindrical portion 512 of the cluster block 50 is inserted through each large hole portion 622b. That is, each large hole part 622b is formed in the magnitude | size in which a part of each cylinder part 512 can each be inserted. Moreover, the end surface of each cylinder part 512 is facing each step part 12f.

  According to this, the same effects as the effects (1) to (3), (6), and (7) of the above embodiment can be obtained. Furthermore, as compared with the case where one through hole through which each conductive terminal 43 can be inserted is formed in the end wall 12a, a part of the end wall 12a exists between the through holes 62b in the end wall 12a. Therefore, the strength of the end wall 12a can be increased.

In the embodiment, the end surfaces of both the cylinder portions 512 may not face the step portion 12f.
In the embodiment, a part of each insulator 44 on the cluster block 50 side may not be inserted inside each cylindrical portion 512.

In the embodiment, the number of conductive terminals 43 is not particularly limited.
In the embodiment, the shape and material of the holding plate 45 are not particularly limited. In short, it is sufficient that the conductive terminal 43 can be held and attached to the housing 10a.

In the embodiment, the motor drive circuit 40 may be attached to the cover member 41 in the accommodation space 41a.
In embodiment, the cover member 41 may be attached to the outer peripheral surface of the suction housing 12, for example. The motor drive circuit 40 may be accommodated in an accommodation space defined by the outer peripheral surface of the suction housing 12 and the cover member 41.

In the embodiment, the compression unit 15 may be, for example, a piston type or a vane type.
Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.

  (A) The compression unit, the electric motor, and the motor drive circuit are arranged in this order along the axial direction of the rotary shaft. The electric compressor according to item.

  DESCRIPTION OF SYMBOLS 10 ... Electric compressor, 10a ... Housing, 12b, 62b ... Through-hole, 12f, 62f ... Step part, 15 ... Compression part, 16 ... Electric motor, 20 ... Lead wire, 40 ... Motor drive circuit, 42 ... Terminal unit, 43 ... conductive terminal, 44 ... insulator, 45 ... holding plate, 46 ... sealing member, 50 ... cluster block, 51a ... connection terminal, 121b, 621b ... small hole, 122b, 622b ... large hole.

Claims (5)

The housing contains a cluster block containing a compression portion, an electric motor, and a connection terminal electrically connected to the lead wire of the electric motor, and is provided across a through hole formed in the housing. A terminal unit that electrically connects the connection terminal and a motor drive circuit that drives the electric motor, the terminal unit being held by the holding plate via an insulator and the connection terminal and the motor drive; An electric compressor having a conductive terminal electrically connected to a circuit, wherein the holding plate is attached to the outside of the housing with a seal member interposed , and the conductive terminal is inserted into the through hole Because
The through hole has a large hole portion that opens into the housing, and a small hole portion that communicates with the large hole portion via a step portion and opens to the outside of the housing,
A part of the cluster block is inserted into the large hole portion, and the seal member is disposed around the small hole portion.   The electric compressor according to claim 1, wherein a part of the cluster block faces the stepped portion.   The electric compressor according to claim 1 or 2, wherein a part of the insulator is inserted into the cluster block. A plurality of the conductive terminals are provided,
The electric compressor according to any one of claims 1 to 3, wherein the housing is formed with one through hole into which all the conductive terminals can be inserted. A plurality of the conductive terminals are provided,
The electric compressor according to any one of claims 1 to 3, wherein the housing is formed with one through hole corresponding to each conductive terminal.