JPH05321840A - Sealed terminal device for compressor - Google Patents

Abstract

PURPOSE:To cover a terminal pin in a metal cap with an insulating plate and an insulating terminal case set in the metal cap for insulation. CONSTITUTION:A sealed terminal 18 fitted to a sealed container 1 is constituted of a metal cap 21 and a terminal pin 23 fixed to the metal cap 21 with a glass seal 22. An insulating plate 43 is set in the metal cap 2. A tube section 44 covering the root of the terminal pin 23 is provided on the insulating plate 43. The tube section 44 of the insulating plate 43 is inserted into the insertion hole of an insulating terminal case 24 when the insulating terminal case 24 is fitted to the terminal pin 23 of the sealed terminal 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed terminal device which improves the insulation performance of terminal pins.

[0002]

2. Description of the Related Art A conventional hermetic compressor is disclosed in, for example, Japanese Patent Application Laid-Open No. 62-62.
It is configured as shown in Japanese Patent No. 284972. Here, a conventional example will be described with reference to this publication. In FIG. 6, reference numeral 50 denotes an airtight container in which an electric element 51 is housed in the upper part and a compression element (not shown) is housed in the lower part. The electric element 51 includes a stator 52 and a rotor 53.
It consists of and. A sealed terminal 54 is attached to the upper wall of the sealed container 50. Sealed terminal 54
Is composed of a metal cap 55 and a terminal pin 57 penetrating the cap and fixed by a glass seal 56. The lead wire 58 drawn out from the stator 52 is connected to the terminal pin 57 from the inside of the hermetically sealed container 50 through a cluster 59 (an insulating terminal case that collectively accommodates terminal pin receiving connectors attached to the ends of the lead wires). Has been done.
The cluster 59 is formed in a size that closes the opening of the metal cap 55.

In the hermetic compressor of this structure, the hermetic container 50
By closing the opening of the metal cap 55 inside the container with a cluster, even if carbide is generated due to abnormal heating of the stator 52 or the like, the carbide is less likely to adhere to the terminal pin 56 in the metal cap 55 of the sealed terminal 54. There is.

[0004]

However, the conventional cluster 59 has the metal cap 5 of the sealed terminal 54.
Since it closes the opening of this cap by closely contacting with 5,
If not properly attached to the terminal pin 57, the metal cap 55
However, there is a problem that the carbide cannot penetrate into the cap and insulation failure occurs.

The present invention solves the above problems,
An object of the present invention is to provide a sealed terminal device in which a tubular portion of an insulating plate covering the inside of a metal cap is extended into an insertion hole into which a terminal pin of an insulating connection case is inserted.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a sealed terminal having a metal cap and a terminal pin is attached to a sealed container containing an electric element and a compression element, and the terminal is provided with an accommodating portion for connecting a lead wire of the electric element. In a sealed terminal device of a compressor provided with an insulating terminal case having an insertion hole for the terminal pin to be connected to this connector, arranged inside the metal cap between the insulating terminal case and the sealed terminal, An insulating plate having a covering portion that covers the inside of the cap and a cylindrical portion that is inserted into the insertion hole and that covers the base of the terminal pin is provided.

[0007]

The present invention is constructed as described above,
Between the sealed terminal and the insulated terminal case, the metal part of the terminal is covered with a cylindrical part that covers the base of the terminal pin of the insulating plate that extends inside the insertion hole of the insulated terminal case.
The terminal pins are covered with an insulating material in a metal cap.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiments shown in the drawings.

FIG. 1 is a vertical sectional view of a rotary compressor showing an embodiment of the present invention. FIG. 2 is a sectional view showing a state in which an insulating terminal case is attached to the sealed terminal of the present invention.
FIG. 3 is a perspective view showing a state in which lead wires are incorporated in the insulated terminal case of the present invention. FIG. 4 is an exploded perspective view showing the assembled state of the insulated terminal case and the lead wire of the present invention. FIG. 5 is an exploded perspective view of the insulated terminal case of the present invention seen from the side attached to the terminal pins.

Reference numeral 1 denotes a closed container in which an electric element 2 is housed on the upper side and a rotary compression element 3 driven by the electric element is housed on the lower side.

The electric element 2 is a stator 5 in which a winding 4 is wound.
And a rotor 6 disposed inside the stator, and a rotating shaft 7 inserted in the center of the rotor.
The winding 4 of the stator 5 is formed such that the outer diameter of the lower coil end 9 is smaller than that of the upper coil end 8.

The rotary compression element 3 is a cylindrical cylinder 10 fixed to the inner wall of the closed container 1, and an eccentric portion 11 of the rotary shaft 7.
A roller 12 that rotates in the cylinder 10, a vane 13 that contacts the roller to divide the cylinder 10 into a high pressure side and a low pressure side, an upper bearing 14 and a lower bearing 15 that seal the opening of the cylinder 7, and the upper bearing. And a cup body 17 that is fitted into the discharge muffler chamber 16 inside. The cup body 17 and the upper bearing 14 are arranged inside the lower coil end 9.

Reference numeral 18 denotes a sealed terminal, which is attached to a protruding portion 19 of the sealed container 1 facing the outer peripheral side of the lower coil end 9. This protruding portion is formed so as to protrude outward from the surface of the side wall of the hermetically sealed container 1 by push working, and further, the hole 20 is formed in the center. The sealing terminal 18 is provided with a metal cap 21 which is set in the hole 20 of the protruding portion 19 from the inside of the closed container 1 and is welded to the closed container, and a glass seal 22, 22, 22 for sealing which penetrates the metal cap 21. Fixed 3
It is formed by the terminal pins 23, 23, 23 of the book. The length of the terminal pin protruding inside the closed container 1 is shorter than the length of the terminal pin protruding outside the closed container 1.

Reference numeral 24 denotes an insulating terminal case attached to the sealed terminal 18, and this insulating terminal case is the case body 2.
5 and the case lid 26.

The case body 25 has three lead wires 27, 27, 27 drawn from the lower coil end 9 of the winding 4.
A first case 30 having a rectangular shape having recesses 29, 29, 29 for accommodating the connectors 28, 28, 28 attached to the tip of the second case, and a second case 31 having a circular shape housed in the metal cap 21. Are integrally formed. The recesses 29, 29, 29 of the first case 30 are arranged in three rows in the center by the partition wall 32, and the center lead wire 27 is drawn out to the side opposite to the outer lead wires 27, 27. The lead wires 27, 27,
Drawout port 29 formed with a gap narrower than the wire diameter of 27
a, 29a, 29a are provided. First case 3
At 0, first engaging holes 33, 33 and a first locking piece 34 are provided. The second case 31 includes lead wires 27, 27,
The first case 30 is provided on both sides orthogonal to the drawing direction of 27.
Formed larger. Further, insertion holes 35, 35, 35 through which the terminal pins 23, 23, 23 pass are formed in the second case. A glass seal 2 is placed around this insertion hole.
Recesses 36, 36 for letting out 2, 22, 22 are formed.

The case lid 26 has second locking pieces 37, 37 fitted in the first engaging holes 33, 33, and the first locking piece 3.
And a second engagement hole 38 for fitting 4 in.
An uneven surface 39 is formed on the outer surface of the case lid 26. Further, the case lid 26 has projecting pieces 40, 41 facing the second case 31 projecting from the first case 30, respectively.
Is provided. Of these projecting pieces, one projecting piece 41 and the second case facing the projecting piece are the lead wire 2 bent along the outer wall of the insulating terminal case 24.
7 is formed, and the protruding piece 41 is provided with a guide hole 42 for attaching the insulating terminal 24 to the sealed terminal 18 with a jig.

Reference numeral 43 denotes an insulating plate made of synthetic resin mounted inside the metal cap 21 of the hermetically sealed terminal 18. The insulating plate is made of polyethylene terephthalate (hereinafter referred to as PET) which is a material excellent in refrigerant resistance and oil resistance. Is becoming The insulating plate 43 is formed by a metal mold after heating a PET thin film plate near its melting point. And
The insulating plate 43 has a cylindrical portion 44, 4 that covers the inside of the metal cap 21, and the cylindrical portion 44, 4 through which the terminal pins 23, 23, 23 pass.
4 and 44, the cylindrical portion of which is formed by the terminal pins 23, 2
It is formed to have substantially the same size as 3, 23. Tubular portion 44,
44 and 44 are insulated terminal cases 24 and sealed terminals 18
Mounted on the insulation terminal case,
35, 35 is formed to have a length to fit inside.

Reference numeral 45 is a sleeve for protecting the three lead wires 27, 27, 27, and this sleeve is bound by a binding thread 46.

In the insulation connecting device having the above-described structure, a method of assembling the insulation terminal case 24 will be described.
The connection tools 28, 28, 28 attached to the tips of 7, 27 are set. Then, the case lid 26 is attached to the case body 25.
With the lead wires 27, 27, 27 covered with the case body and held by the case body and the case lid, the second locking pieces 37, 37 and the second engagement hole 38 of the case lid are attached to the first case 30. The first engaging holes 33, 33 and the first locking pieces 34 are slid and fitted together. Finally, one lead wire 2 in the middle
7 are bent along the outer wall of the insulating terminal case 24 and collected on the side of the lead wires 27, 27 that are drawn out from the outside, and the lead wires are covered with a sleeve 45 and bound with a binding thread 46 to be assembled.

The insulated terminal case 24 has a protruding piece 41.
A guide pin of a jig is inserted into the guide hole 42 of the above, and the jig is attached to the sealed terminal 18 in which the insulating plate 43 is set.

The insulated terminal case 24 has recesses 29, 29, 2
By pulling out the lead wire 27 of the connector 28 housed in the middle recess 29 out of the two terminal pins 23, 23 among the connectors 28, 28, 28 housed in the recess 29, The size of the array of 29, 29 is set so that it can be accommodated in the metal cap 21. Therefore, the case body 25 is fitted in the metal cap 21.
Moreover, the case body 25 is attached to the metal cap 21 so as to be substantially in close contact with the second case 31 by setting the insulating plate 43 in the metal cap 21 while making the second case 31 into a circular shape, and the case body is inserted. Holes 35,35,3
When the insulating terminal case 24 is attached, the terminal pins 23 and 2323 are covered with the insulating material by inserting the cylindrical portions 44, 44 and 44 of the insulating plate 43 into the metal cap 5, so that metal powder, oil sludge, etc. can be removed from the metal cap 21. Inside terminal pins 23, 23, 2
I try not to stick to 3.

The insulating plate 43 is formed of a film-shaped PET with a metal mold and has substantially the same thickness.
The cylindrical portions 44, 44, 44 can be fitted in the insertion holes 35, 35, 35 of each other with no gaps, and metal powder or oil sludge is prevented from entering the insulating terminal case 24 through the insertion holes. .. Further, the insulating plate 43 does not reduce the insulation resistance of the sealed terminal 18 even when it is used in a compressor that uses a refrigerant of R-22 having a small insulation resistance.

Since the insulating terminal case 24 is housed in the metal cap 21, the thickness in the radial direction at the time of mounting is reduced, and the insulating terminal case 24 is mounted on the outer periphery of the lower coil end 9 of the electric element 2 with a secured insulating distance. .. Moreover, the insulating terminal case 24 has the insertion holes 35, 3 through which the terminal pins 23, 23, 23 pass.
Recesses 36 around which the glass seal 22 escapes,
By forming 36, 36, it is possible to fit the sealing terminal 18 so as to substantially eliminate the dead space in the metal cap 21.

The lead wire 27 bent along the outer wall of the insulating terminal case 24 is held by the second case 31 which is larger than the first case 30 and the projecting piece 40 of the case lid 26, so that the sealed terminal 18 is connected. It is designed so as not to come into contact with the closed container 1 even when it is attached or loosened after attachment. Further, the lead wires 27, 27, 27 are covered with a protective sleeve 45 and are bound with a binding thread 46 so that they are not damaged even if they come into contact with a high temperature portion.

The case lid 26 has an uneven surface 39 on the outer surface.
By forming the case lid, the case main body 25
It becomes easier to slide the insulating terminal case 24, and the assembling property of the insulated terminal case 24 can be improved.

Since the lead wire 27 is bent in the opposite direction along the outer wall of the insulating terminal case 24, the case lid 26 is prevented from falling off from the case body 25 by this lead wire.

[0027]

As described above, according to the present invention, a sealed terminal having a metal cap and a terminal pin is attached to a sealed container accommodating an electric element and a compression element, and a connector for connecting a lead wire of the electric element is attached to this terminal. A sealed terminal device for a compressor, comprising: an insulating terminal case having a housing and an insertion hole for the terminal pin connected to the connector, wherein a metal cap is provided between the insulating terminal case and the sealed terminal. Since the insulating plate having the covering portion which is disposed inside the cap and the cylindrical portion which is inserted into the insertion hole and covers the base of the terminal pin is provided, the terminal pin inside the metal cap is provided. By simply attaching the insulating terminal case to the, the cylindrical part of the insulating plate can be inserted into the insertion hole of this insulating terminal case, and the terminal pin in the metal cap can be disconnected from the insulating terminal case. Can cover in wood, it can be such that the terminal pins and the metal cap is not electrically short-circuited by the metal powder and oil sludge or the like.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a rotary compressor showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which an insulating terminal case is attached to the sealed terminal of the present invention.

FIG. 3 is a perspective view of a lead wire incorporated in the insulated terminal case of the present invention.

FIG. 4 is an exploded perspective view showing an assembled state of the insulated terminal case and the lead wire of the present invention.

FIG. 5 is an exploded perspective view of the insulated terminal case of the present invention seen from the side where it is attached to a terminal pin.

FIG. 6 is a cross-sectional view of essential parts showing a state in which an insulating terminal case is attached to a sealed terminal of a conventional compressor.

[Explanation of symbols]

 1 Airtight Container 2 Electric Element 3 Rotating Compression Element 18 Sealing Terminal 21 Metal Cap 23 Terminal Pin 24 Insulating Terminal Case 25 Case Body 26 Case Lid 27 Lead Wire 28 Connector 33, 38 Engagement Hole 34, 37 Locking Piece 40, 41 Projection 43 Insulation plate 43a Cover 44 Cylindrical

Claims (1)

[Claims] 1. A sealed terminal having a metal cap and a terminal pin is attached to a closed container containing an electric element and a compression element, and the terminal for connecting a lead wire connector of the electric element and the connector are connected to the terminal. In a sealed terminal device of a compressor, comprising: an insulating terminal case having an insertion hole for the terminal pin; disposed inside a metal cap between the insulating terminal case and the sealed terminal, and covering the inside of the cap. A hermetically sealed terminal device for a compressor, comprising: an insulating plate having a covering portion and a tubular portion that is inserted into the insertion hole and covers the root of the terminal pin.