WO2019216834A1

WO2019216834A1 - Power supply wire connecting structure for hermetic compressor

Info

Publication number: WO2019216834A1
Application number: PCT/TH2018/000022
Authority: WO
Inventors: Mullika SUPPAYUNGTHONG; Nuttagun JENWEERAWAT
Original assignee: Siam Compressor Industry Co., Ltd.
Priority date: 2018-05-07
Filing date: 2018-05-07
Publication date: 2019-11-14

Abstract

The present invention discloses a power supply wire connecting structure (1) for a hermetic compressor (10) comprising: a glass terminal (30) including a circular cap shaped body (31), and a plurality of connection pins (32) which are held by the circular cap shaped body (31) and insulated from the circular cap shaped body (31) by glass, the glass terminal (30) is fixed to a sealed vessel (13); a terminal body (60) covering an entire surface of the glass terminal (30) which is exposed at an external side of the sealed vessel (13); and a seal member (50) surrounding a whole outer periphery of the glass terminal (30), the seal member (50) is sandwiched between a flat surface portion (11) of the sealed vessel (13) and the terminal body (60).

Description

TITLE OF THE INVENTION

POWER SUPPLY WIRE CONNECTING STRUCTURE FOR HERMETIC COMPRESSOR

FIELD OF INVENTION

The present invention relates to a power supply wire connecting structure for a hermetic compressor.

BACKGROUND OF THE INVENTION

A compressor is one of the components of a refrigeration cycle apparatus.

One of the functions of the compressor is to increase the pressure of the refrigerant in the system. The driving force of the compressor is transmitted through the glass terminal to an electric motor inside the compressor.

It is known that the compressor has a glass terminal on the side surface of the sealed vessel, as is disclosed in European Patent Application Publication No. EP2693056A1 (PTL1). Moreover, it is also known that there is also a compressor having the glass terminal on the upper surface of the sealed vessel, as is disclosed in European Patent Application Publication No. EP 1703133 A2 (PTL2). The glass terminal is attached to the sealed vessel by resistance welding.

The glass terminal includes a circular body to be welded to the sealed vessel and a plurality of metal connecting pins. Each of the connecting pins is attached to the circular body with glass which is an insulator interposed between them. The connecting pin passes through the circular body, and there is glass between the each connecting pin and the circular body. Since each of the connection pins are held by the glass, the occurrence of electrical short-circuit is prevented.

External power wires are connected to the connecting pins of the glass terminal. Thereby, electric power is supplied to the electric motor inside the compressor, and the compressor is driven.

The inside of the compressor is higher in pressure than outside of the compressor. If cracks occur at the glass portion of the glass terminal or a welded portion between the glass terminal and a sealed vessel for some reason, it is possibility that the refrigerant inside the compressor leaks to the outside of the compressor through the crack due to the pressure difference. Therefore, the development of the power supply wire connecting structure for the hermetic compressor capable to preventing the refrigerant from flowing out to the outside, even if the flammable refrigerant such as R32 refrigerant or R290 refrigerant leaks from the crack of the glass portion or the welded portion, is required.

CITATION LIST

Patent Literature

PTL 1 : European Patent Application Publication No. EP2693056A1

PTL 2: European Patent Application Publication No. EP1703133A2

SUMMARY OF THE INVENTION

It is an objective of the present invention to provide a highly reliable power supply wire connecting structure which prevents the leaked refrigerant from flowing out to the outside, even if the refrigerant leaks from the crack of the glass portion of the glass terminal or the crack of the welded portion between the glass terminal and the sealed vessel.

In order to achieve the above objective, an embodiment of the present invention provides a power supply wire connecting structure for a hermetic compressor comprising: a glass terminal including a circular cap shaped body, and a plurality of connection pins which are held by the circular cap shaped body and insulated from the circular cap shaped body by glass, the glass terminal is fixed to a sealed vessel of the hermetic compressor; a terminal body covering an entire surface of the glass terminal which is exposed at an external side of the sealed vessel; and a seal member surrounding a whole outer periphery of the glass terminal, the seal member is sandwiched between a flat surface portion of the sealed vessel and the terminal body.

According to the embodiment of the present invention, the seal member surrounds the whole outer periphery of the glass terminal and is sandwiched between the flat surface portion of the sealed vessel and the terminal body. Also, the terminal body covers the entire surface of the glass terminal, which is exposed at an external side of the sealed vessel.

As such, even if the refrigerant leaks from the crack of the glass portion of the glass terminal or the welded portion between the glass terminal and the sealed vessel, the leaked refrigerant is prevented from flowing out of a space surrounded by the structure of the flat surface portion of the sealed vessel and the terminal body and seal member.

Therefore, the power supply wire connecting structure for the hermetic compressor is capable of preventing the refrigerant from leaking to the outside through the crack of the glass portion of the glass terminal or the crack of the welded portion between the glass terminal and the sealed vessel. As result, it is possible to provide a highly reliable power supply wire connecting structure which prevents the leaked refrigerant from flowing out to the outside.

BRIEF DESCRIPTION OF DRAWINGS

The principle of the present invention and its advantages will become apparent in the following description taking in consideration with the accompanying drawings in which:

FIG.l is a schematic diagram of a refrigeration cycle apparatus including the hermetic compressor to which the power supply wire is connected by the power supply wire connecting structure for the hermetic compressor according to an embodiment 1 of the present invention;

FIG.2 is an external perspective view of the hermetic compressor shown in FIG. 1 ;

FIG.3 is a partially enlarged view around the glass terminal in FIG.2;

FIG.4 is a longitudinal section view of the glass terminal and the periphery thereof in

FIG.2;

FIG.5 is an external perspective view of the power supply wire connecting structure according to embodiment 1 of the present invention;

FIG.6 is an exploded perspective view of the power supply wire connecting structure shown in FIG.5;

FIG.7A to FIG.7C are views for explaining the terminal body shown in FIG.6, in which FIG.7A is an external view when viewed from the glass terminal side, FIG.7B is an external view when viewed from the opposite side of FIG.7A, and FIG.7C is a longitudinal section view of the socket pin portion;

FIG.8 is an exploded perspective view of the terminal body shown in FIG.6;

FIG.9 is a longitudinal section view of the power supply wire connecting structure according to embodiment 1 of the present invention;

FIG.10 is an external perspective view of the power supply wire connecting structure according to embodiment 2 of the present invention;

FIG.l 1 is an exploded perspective view of the power supply wire connecting structure shown in FIG.10;

FIG.12 is a longitudinal section view of the power supply wire connecting structure according to embodiment 2 of the present invention;

FIG.13 is an external perspective view of the power supply wire connecting structure according to embodiment 3 of the present invention; FIG.14A to FIG.14B are external perspective views of the terminal body covered with the terminal cover shown in FIG.13, in which FIG.14A is an external view when viewed from the glass terminal side, and FIG.14B is an external view when viewed from the opposite side of FIG.14B; and

FIG.15 is a longitudinal section view of the power supply wire connecting structure according to embodiment 3 of the present invention.

DETAILED DESCTIPTION OF EMBODIMENTS OF THE INVENTION

Hereinafter, the power supply wire connecting structures for the hermetic compressor according to embodiments of the invention will be described with reference to the drawings and the like. Here, in the drawings described below, portions or members designated by the same reference signs are the same or equivalent, and the same applies to embodiment described below.

[Embodiment 1]

As shown in FIG. 1 , an outdoor unit 400 includes a casing 401 in order to accommodate a fan 402, a hermetic compressor 10, and a power connector 201. The hermetic compressor 10 includes a sealed vessel 13 formed in a cylindrical shape, which accommodates a compression pump unit (not shown) and an electric motor 12 which are housed and installed in a state of being connected to each other via a drive shaft so that the compression pump unit is driven by rotation of the electric motor 12 to compress refrigerant in the refrigeration cycle circuit.

The sealed vessel 13 is formed to connect with a suction pipe 403 provided so as to pass through the sealed vessel 13 for sucking a refrigerant gas, a discharge pipe 404 for discharging a compressed refrigerant gas to outside.

Furthermore, the hermetic compressor 10 has a power supply wire connecting structure 1 A for supplying electric power from the power connector 201 to the electric motor 12. Electric power is supplied to the power connector 201 from the outside directly or via an indoor unit (not shown). The power supply wire connecting structure 1A connects to the power connector 201 by a power supply wire 80 which has a plurality of wiring cables 80a, 80b, 80c.

The structure of the power supply wire connecting structure 1A is described while referring to FIG. 2 through FIG. 9.

As shown in FIG.2 to FIG.6 and FIG.9, the sealed vessel 13 has at its curved surface a flat surface portion 1 1 formed by sheet metal working. The flat surface portion 11 has a circular flat surface with a hole at its center so as to connect with the power supply wire connecting structure 1A. The power supply wire connecting structure 1A includes a glass terminal 30 having a circular cap shaped body 31 and a plurality of connection pins 32, a terminal body 60, and a seal member 50.

As shown in FIG.4 and FIG.9, the circular cap shaped body 31 is formed in a cap shape so as to open on one side thereof, and is formed to be larger in cross section on an opening side.

When the circular cap shaped body 31 is installed into the sealed vessel 13, the opening side with the larger diameter is positioned inside the sealed vessel 13 for the purpose of preventing the circular cap shaped body 31 from passing through the hole of the flat surface portion 1 1.

The periphery of the circular cap shaped body 31 of the glass terminal 30 is fitted in the hole of the flat surface portion 1 1. And a welded portion 34 is formed there by resistance welding. Each of the connection pins 32 is integrally held in the circular cap shaped body 31 with a glass portion 33 interposed therebetween.

That is, the glass portion 33 exists between the connection pins 32 and the circular cap shaped body 31. Because the glass portion 33 is made of glass with an insulation property, even if the circular cap shaped body 31 and the connection pins 32 are both made of metal, each of the connection pins 32 is protected against short circuits. In the hermetic compressor 10, a lead wire 85 is connected to the end portion of each connection pin 32 protruding into the sealed vessel 13.

A terminal box 40 is positioned over the periphery of the glass terminal 30 so as to support the terminal body 60 which is connecting to the glass terminal 30, as illustrated in FIGs.5 and 9. The terminal box 40 having a two open end cylindrical shape includes a first end face 40a and a second end face 40b, as illustrated in FIG.9.

As shown in FIGs. 6 and 9, the first end face 40a of the terminal box 40 has a plurality of screw holes 41. The second end face 40b having a flat surface is fixed to the flat surface portion 1 1 of the sealed vessel 13 by arc welding or other means. It may be advantageous to weld the second end face 40b and the flat surface portion 1 1 by arc spot welding, for instance, three- point arc spot welding. In the case of three-point arc spot welding, evolution of strain and distortion near the welding zone of the sealed vessel 13 is not occurred. Therefore, the glass portion 33 of the glass terminal 30 is prevented from breakage.

Referring to FIGs. 6 and 7, the terminal body 60 covering an entire surface of the glass terminal 30 which is exposed at an external side at the sealed vessel 13. The terminal body 60 comprises a body base 62 having a circular shape and a seal pressing protrusion 63 having an annular shape.

As shown in FIG.9, the body base 62 has a front surface 62a facing the first end face 40a of the terminal box 40, a back surface 62b positioning in an opposite direction to the front surface 62a, and a plurality of bolt through holes 68.

Each of the bolt through holes 68 is penetrating the body base 62 in parallel with the protruding direction of the seal pressing protrusion 63 and is provided at a position corresponding to each screw hole 41 of the first end face 40a of the terminal box 40. A fixing bolt 300 passes through each of the bolt through holes 68. Thus, the configuration is made such that the terminal body 60 can be tightened and fixed to the terminal box 40 with the seal member 50 interposed therebetween by passing each fixing bolt 300 through the bolt through hole 68 and the screw hole 41. Each fixing bolt 300 is tightened with a specified torque.

The seal member 50 has an annular flat plate shape and is located inside the terminal box 40 and surrounds a whole outer periphery of the glass terminal 30. The seal member 50 is sandwiched between the flat surface portion 1 1 of the sealed vessel 13 and the terminal body 60. The seal member 50 is not limited to the annular flat plate shape. The seal member 50 may have any shape as long as it is located inside the terminal box 40 and surrounds the periphery of the glass terminal 30.

As such, even if the refrigerant leaks from the crack of the glass portion 33 of the glass terminal 30 or the welded portion 34 between the glass terminal 30 and the sealed vessel 13, the leaked refrigerant is prevented from flowing out from a space formed inside the seal pressing protrusion 63 of the terminal body 60 and the seal member 50.

Therefore, the power supply wire connecting structure 1 A for the hermetic compressor 10 is capable of preventing the refrigerant from leaking to the outside through the crack of the glass portion 33 of the glass terminal 30 or the welded- portion 34 between the glass terminal 30 and the sealed vessel 13. As a result, it is possible to provide a highly reliable power supply wire connecting structure 1 A which prevents the leaked refrigerant from flowing out to the outside.

As shown in FIG.7A and FIG.7C and FIG.8, the power supply wire connecting structure 1 A further comprises a plurality of conductive socket pins 70 which are formed in a bottomed cylindrical shape. The conductive socket pin 70 has a fixing portion 71 and a pin connecting portion 72 which is electrically connected with the connection pin 32.

The fixing portion 71 has a screw hole 71a which opens to the end face, and a plurality of annular grooves and a plurality of annular ridges at the outer periphery between two end faces. As shown in FIG.7C and FIG.9, the pin connecting portion 72 having a hollow cylindrical shape is formed in a manner to extend from the fixing portion 71 toward the seal pressing protrusion 63. The connection pin 32 of the glass terminal 30 is fitted inside the pin connection portion 72, and the pin connection portion 72 is connected to the connection pin 32. However, the shape of the pin connecting portion 72 is not limited to this. Any shape may be used as long as the connection pin 32 can be connected and positioned inside.

The outer periphery of the fixing portion 71 of the conductive socket pin 70 is integrated with the terminal body 60 by insert molding. The conductive socket pins 70 are incorporated into the terminal body 60 during the resin molding stage. Therefore, the outer periphery of the fixing portion 71 and the terminal body 60 are in close contact with each other, and there is no gap between them.

However, the seal between the fixing portion 71 of the conductive socket pin 70 and the terminal body 60 is not limited to being obtained by insert molding. A certain seal member such as an O-ring may be interposed between the fixing portion 71 and the terminal body 60 so as to seal between them.

According to the embodiment of the present invention, since the outer periphery of the conductive socket pin 70 is integrated with the terminal body 60, the whole outer periphery of the fixing portion 71 of the conductive socket pin 70 is sealed by the terminal body 60 without any gap therebetween.

Therefore, even if the leaked refrigerant try to flow out through the outer periphery of the conductive socket pin 70, the power supply wire connecting structure 1 A certainly prevents the refrigerant from leaking to the outside through between the fixing portion 71 of the conductive socket pin 70 and the terminal body 60.

In addition, as shown in FIG. 8, the back surface 62b of the body base 62 are indented to form a plurality of wire guide grooves 67. The back surface 62b is on an opposite side surface of the glass terminal 30. The wire guide grooves 67 extends from the position which the screw holes 7la of the conductive socket pins 70 are exposed toward the outer periphery of the body base 62.

The plurality of the power supply wires 80 are arranged inside the wire guide grooves 67 and electrically connected with the connection pins 32 and led out in the same direction each other. For example, FIG. 8 shows three wiring cables 80a, 80b, 80c as the power supply wire 80 which are crimped with a round terminal 81 at the tip thereof. Each round terminal 81 is fixed to the conductive socket pin 70 with a bolt 90 which a washer 91 is interposed between the bolt 90 and the round terminal 81. The bolt 90 is screwed into the screw hole 71a of the fixing portion 71.

Since the wire guide grooves 67 are formed on an opposite side surface of the glass terminal 30 and the plurality of the power supply wires 80 are arranged inside the wire guide grooves 67, it is possible to enhance insulation between the power supply wires 80 and the sealed vessel 13 of the hermetic compressor 10 without needing any additional member.

Additionally, since the plurality of the power supply wires 80 are arranged inside the wire guide grooves 67 and electrically connected with the connection pins 32 and led out in the same direction to each other, the plurality of the power supply wires 80 can be easily led from the outer periphery of the body base 62.

The seal pressing protrusion 63 having an annular shape is formed to protrude from the front surface 62a of the body base 62 toward the glass terminal 30, when the terminal body 60 is attached to the hermetic compressor 10. The maximum outer diameter of the seal pressing protrusion 63 is formed smaller than the inner diameter of the terminal box 40, so that the seal pressing protrusion 63 is inserted into the terminal box 40. The end surface of the seal pressing protrusion 63 is a seal surface 63a which will press the seal member 50, as shown in FIG.9.

Further, the terminal body 60 has a discharge prevention wall 66 formed on the inner periphery side of the seal pressing projection 63. The discharge prevention wall 66 is formed between the conductive socket pins 70 so as to surround the periphery of each pin connecting portion 72. The discharge prevention wall 66 is resin molded integrally with the terminal body 60 and has insulation properties.

Since the discharge prevention wall 66 is formed between the conductive socket pins 70 and has insulation properties, insulation between the conductive socket pins 70 are enhanced in comparison with the case not having the discharge prevention wall 66. Furthermore, since the discharge prevention wall 66 is formed inside the seal pressing projection 63 so as to be connected to the seal pressing projection 63, the rigidity of the terminal body 60 is also enhanced.

Next, the operation of the power supply wire connecting structure 1 A will be provided with reference to FIG.9.

As mentioned above, the seal member 50 is placed on the flat surface portion 1 1. The terminal body 60 is fixed to the terminal box 40 with the plurality of fixing bolts 300. Each fixing bolt 300 passes through the bolt through hole 68 formed in the body base 62 and is screwed into the screw hole 41. Also, the pin connecting portions 72 of the conductive socket pins 70 and the connection pins 32 of the glass terminal 30 are connected. When electric power is supplied to the power supply wires 80, the electric power is transmitted to the lead wire 85 via the round terminal 81, the conductive socket pin 70, the connection pin 32, and then is supplied to the electric motor 12.

In the power supply wire connecting structure 1A, the seal member 50 is sandwiched between the flat surface portion 11 of the sealed vessel 13 and the seal surface 63a of the seal pressing protrusion 63, and is brought into close contact with each other by fastening the fixing bolt 300. Thus, a closed space 120 is formed among the seal member 50, the seal pressing protrusion 63 of the terminal body 60, and the glass terminal 30.

As shown in FIG. 9, since there is no gap between the outer periphery of the fixing portion 71 of the conductive socket pin 70 and the terminal body 60 by the insert molding, whenever the refrigerant leaks from the glass portion 33 of the glass terminal 30 or the welded portion 34 between the glass terminal 30 and the sealed vessel 13, the leaked refrigerant will stay in the closed space 120 and will not flow out to outside because there is no gap between the flat surface portion 1 1 and the seal member 50 and the seal pressing protrusion 63 and between the outer periphery of the fixing portion 71 of the conductive socket pin 70 and the terminal body 60.

The outer periphery of the fixed portion 71 and the terminal body 60 are in close contact with each other by insert molding, and there is a clearance between the outer periphery of the pin connecting portion 72 and the terminal body 60. If there is no clearance around the outer periphery of the pin connecting portion 72, the connection pins 32 of the glass terminal 30 cannot be inserted into the pin connection part 72.

Moreover, as shown in FIG. 7B, three wire guide grooves 67 are provided in the terminal body 60 for each of the three wiring cables 80a, 80b, and 80c so that three wiring cables 80a, 80b, and 80c are guided in the same direction. Therefore, three wiring cables 80a, 80b, and 80c are lined up, and the worker can easily perform the wiring work.

Furthermore, as shown in FIG. 7A, the discharge prevention wall 66 is provided inside the seal pressing protrusion 63 of the terminal body 60 while maintaining a gap with the pin connecting portion 72 of the conductive socket pin 70.Thus, even if the pin connecting portions 72 are respectively connected to the connection pins 32 of the glass terminal 30 and electric power is supplied, the sufficient insulating distance is maintained by the discharge prevention wall 66. Therefore, it is possible to prevent the occurrence of discharge between the pin connecting portions 72.

[Embodiment 2]

A power supply wire connecting structure 1 B according to second embodiment of the present invention will be describe with reference to FIG. 10 to FIG. 12.

The difference of the second embodiment from the first embodiment described above is a washer sheet 100 which is fixed on the terminal body 60 at the back surface 62b so as to cover the wire guide grooves 67, as illustrated in FIGs. 10 to 12. The washer sheet 100 is made of a metal material such as stainless steel.

The washer sheet 100 has an annular shape, and the outer diameter thereof is substantially the same as the outer diameter of the body base 62. However, the shape of the washer sheet 100 is not limited to those described above. It may be a circular shape without a hole in the center.

As shown in FIG.l 1, the washer sheet 100 is provided with a plurality of bolt through holes 103. The washer sheet 100 can be fixed to the back surface 62b of the body base 62 by passing each fixing bolt 300 through the bolt through hole 103, the bolt through hole 68 of the body base 62, and the screw hole 41 of the first end face 40a, and then tightening each fixing bolt 300 with a specified torque.

Since the washer sheet 100 is fixed on the terminal body 60 by the fixing bolts 300, it is possible to prevent the fixing bolts 300 fastening the terminal body 60 to the terminal box 40 from loosening. Therefore, the sealing effect provided by the seal member 50 is maintained for a long period, and the sealing capacity of the closed space 120 is also maintained.

Moreover, since the washer sheet 100 covers the back surface of the main body base 62, it is possible to reduce the opportunity to damage each member including the plurality of power supply wires 80.

Additionally, since the washer sheet 100 is fixed on the terminal body 60 so as to cover the wire guide grooves 67, the plurality of the power supply wires 80 are fixed in a predetermined position inside the wire guide grooves 67. Therefore, since the one assembly is integrated, it is easy to install on the predetermined position the glass terminal 30 and the sealed vessel 13.

As described above, the power supply wire connecting structure IB of the second embodiment further improves reliability as compared with the power supply wire connecting structure 1 A of the first embodiment by adding the washer sheet 100.

[Embodiment 3] A power supply wire connecting structure 1C according to third embodiment of the present invention will be describe with reference to FIG. 13 to FIG. 16.

The third embodiment differs from the second embodiment in the point that there is a terminal cover 110 which is made of rubber, as shown in FIG. 13. The terminal cover 110 covers the terminal body 60, the washer sheet 100 and the power supply wires 80 so as to integrate the terminal body 60, the washer sheet 100 and the power supply wires 80, as shown in FIG. 14 and FIG. 15.

However, although the terminal cover 110 covers the front surface 62a of the body base 62 which faces the end face 40a of the terminal box 40, it does not cover the seal pressing protrusion 63 of the terminal body 60. So, the terminal cover 110 is interposed between the end face 40a of the terminal box 40 and the front surface 62a of the body base 62. The power supply wire 80 is not entirely covered by the terminal cover 110. Only a part of the power supply wire 80 which is close to the terminal body 60 is covered.

The terminal cover 110 is manufactured by insert molding by placing the terminal body 60 containing the conductive socket pin 70, the washer sheet 100, and the power supply wires

80, into a mold cavity and performing insert molding them with rubber. As a result, the terminal cover 110 is in close contact with the outer peripheral surface of the terminal body 60 and the washer sheet 100, and the washer sheet 100 and the back surface 62b of the terminal body 60 are brought into close contact.

Since the terminal body 60, the washer sheet 100 and the power supply wires 80 are integrated by the terminal cover 110, the integrated assembly which is covered by the terminal cover 110 is hardly destroyed.

Additionally, the integrated assembly which is covered by the terminal cover 110 is able to be more easily installed on the predetermined position the glass terminal 30 and the sealed vessel 13.

As such, it is possible to improve the workability of attaching the integrated assembly to the hermetic compressor 10 and further reduce the opportunity to damage each member inside the integrated assembly.

A plurality of grooves are formed in a portion of the terminal cover 110 which covers a part of the power supply wires 80 on the outside of the terminal body 60 to constitute a flexible structural portion 1 12.

The flexible structure portion 112 is flexible and can be bent, and it is possible to bend the power supply wires 80 gently even if it is covered with rubber. As shown in FIG. 15, a connecting point 405 of the power supply wire connecting structure 1C is a point where each round terminal 81 of the power supply wires 80 is fixed to the conductive socket pin 70 with the bolt 90, which the washer 91 is interposed between the bolt 90 and the round terminal 81. Unlike the power supply wire connecting structure 1 A of the first embodiment and the power supply wire connecting structure IB of the second embodiment, in this power supply wire connecting structure 1C, all of the connecting points 405 are covered by the terminal cover 110 made of rubber and are not exposed to the outside.

Therefore, adhesion between dust particles and water droplets to the connecting point 405 can be prevented, and occurrence of short circuit or electric leakage can be avoided.

In addition, since the terminal body 60 is covered with the terminal cover 1 10 made of rubber, it is protected from a shock caused by a slight contact.

Since the rubber terminal cover 1 10 also covers a part of the power supply wire 80 coming out from the terminal body 60, the power supply wire 80 is not bent abruptly. Therefore, stress concentration caused by extreme bending is avoided. However, since the flexible structural portion 1 12 is formed in the portion where the terminal cover 110 covers the power supply wire 80, the power supply wire 80 can be gently bent.

In the terminal cover 110, there is no rubber in each portion where the three fixing bolts 300 are located. Therefore, as shown in FIG. 15, the heads of the respective fixing bolts 300 contact the back surface of the washer sheet 100 directly and press it, so that loosening of the respective fixing bolts 300 is prevented, and the sealing effect provided by the seal member 50 and the sealing capacity of the closed space 120 is maintained for a long period.

As described above, the power supply wire connecting structure 1C of the third embodiment further improves reliability and workability as compared with the power supply wire connecting structure 1A of the first embodiment and the power supply wire connecting structure 1 B of the second embodiment by adding the terminal cover 1 10.

Although specific embodiments of the invention have been disclosed and described as well as illustrated in the companying drawings, it is simply for the purpose of better understanding of the principle of the present invention and it is not as a limitation of the scope and spirit of the teaching of the present invention. Adaption and modification to various structures such as design or material of the invention are possible and apparent to a skilled person without departing from the scope of the present invention which is to be determined by the claims.

List of reference: 1 A : Power supply wire connecting structure of the first embodiment IB : Power supply wire connecting structure of the second embodiment 1C : Power supply wire connecting structure of the third embodiment 10 : Hermetic compressor

11 : Flat surface portion

12 : Electric motor

13 : Sealed vessel

30 : Glass terminal

31 : Circular cap shaped body

32 : Connection Pin

33: Glass portion

34 : Welded portion

40 : Terminal box

40a: First end face

40b: Second end face

41 : Screw hole

50 : Seal member

60 : Terminal body

62 : Body base

62a: Front surface

62b: Back surface

63: Seal pressing protrusion

63a : seal surface

66 : Discharge prevention wall

67 : Wire guide groove

68 : Bolt through hole

70 : Conductive socket pin

71 : Fixing portion

71a : Screw hole

72 : Pin connecting portion

80 : Power supply wire

80a, 80b, 80c : Wiring cable

81 : Round terminal 85 : Lead wire

90 : Bolt

91 : Washer

100 : Washer sheet

103 : Bolt through hole

110 : Terminal cover

112 : Flexible structural portion 120 : Closed space

201 : Power connector 300 : Fixing bolt

400 : Outdoor unit

401 : Casing

402 : Fan

403 : Suction pipe

404 : Discharge pipe

405 : Connecting point

Claims

1. A power supply wire connecting structure for a hermetic compressor comprising: a glass terminal including a circular cap shaped body, and a plurality of connection pins which are held by the circular cap shaped body and insulated from the circular cap shaped body by glass, the glass terminal is fixed to a sealed vessel of the hermetic compressor;

a terminal body covering an entire surface of the glass terminal which is exposed at an external side of the sealed vessel; and

a seal member surrounding a whole outer periphery of the glass terminal, the seal member is sandwiched between a flat surface portion of the sealed vessel and the terminal body.

2. The power supply wire connecting structure for the hermetic compressor of claim 1, wherein the power supply wire connecting structure further comprises a plurality of conductive socket pins which respectively are electrically connected with the connection pins, each of the conductive socket pins has a fixing portion, and an outer periphery of the fixing portion is sealed to the terminal body.

3. The power supply wire connecting structure for the hermetic compressor of claim 2, wherein the power supply wire connecting structure further comprises a terminal box positioned over the periphery of the glass terminal so as to support the terminal body, wherein the seal member is located inside the terminal box, and wherein a closed space is formed around the glass terminal by the terminal body and the terminal box.

4. The power supply wire connecting structure for the hermetic compressor of any one of preceding claims 1 to 3, wherein the terminal body includes a wire guide groove which is formed on an opposite side surface of the glass terminal, and wherein a plurality of power supply wires are arranged inside the wire guide groove and electrically connected with the connection pins and led out in the same direction.

5. The power supply wire connecting structure for the hermetic compressor of claim 4, wherein the terminal body includes a seal pressing projection which is formed in an annular shape and presses the seal member, and a discharge prevention wall which is formed on the inner peripheral side of the seal pressing projection and formed between the plurality of conductive socket pins, and

wherein the discharge prevention wall has insulation properties.

6. The power supply wire connecting structure for the hermetic compressor of claim 4 or 5,

wherein the power supply wire connecting structure further comprises a washer sheet which is fixed on the terminal body by bolts so as to cover the wire guide grooves.

7. The power supply wire connecting structure for the hermetic compressor of claim 6, wherein the power supply wire connecting structure further comprises a terminal cover which covers the terminal body, the washer sheet and a part of the power supply wires so as to integrate the terminal body , the washer sheet and the power supply wires.