JP6416645B2 - Hermetic compressor - Google Patents

Description

  The present invention relates to a hermetic compressor.

Conventionally, a compressor unit and a motor unit for driving the compressor unit are accommodated in a sealed container, and a lead wire drawn out from the motor unit is connected to a power supply connection terminal provided on a side of the sealed container. A hermetic compressor in which the lead wire is covered with a tubular protective member is known (see, for example, Patent Document 1).
According to such a hermetic compressor, even if the lead wire comes into contact with the inner wall of the hermetic container due to the vibration of the driven motor part, the lead wire is covered with the protective member, thereby preventing an electrical short circuit accident. Can do.

Also, the stator side end of the lead wire connecting the stator as the electric element and the hermetic terminal provided on the upper end surface of the hermetic case is held by the holding tool provided on the stator, leading to the rotor side. A hermetic compressor that prevents the wire from falling is known (for example, see Patent Document 2).
According to this hermetic compressor, it is possible to prevent the lead wire from coming into contact with and damaging the rotor that rotates at high speed on the inner peripheral side of the stator.

JP-A-8-163804 JP-A-1-187393

  However, in a hermetic compressor in which a lead wire is covered with a tube-shaped protective member (see, for example, Patent Document 1), since the lead wire is not fixed in the hermetic container, refrigerant or refrigeration oil flowing in the hermetic container Will be moved by being beaten by. As a result, the protective member comes into contact with the inner wall of the motor unit or the sealed container and wears out, and an electrical short circuit accident may occur due to the contact between the lead wire and the motor unit or the sealed container.

  Further, in a hermetic compressor in which the end portion of the lead wire is held on the stator with a holder (see, for example, Patent Document 2), there is a possibility that the covering of the stator coil (wire) may be damaged by the holder. When the coating material is damaged, there is a problem that a rare short (interlayer short-circuit) occurs.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a highly reliable hermetic compressor that can more reliably protect the lead wire for supplying power to the stator and the coating material for the stator coil than before.

The present invention that has solved the above-mentioned problems is a hermetic compressor in which a compression mechanism unit that compresses refrigerant gas and an electric motor unit that drives the compression mechanism unit are housed in a hermetic container. A hermetic terminal provided on a side wall for supplying power to the motor unit; one end connected to the hermetic terminal via a contact and extending toward the motor unit side along the rotation axis direction of the motor unit; And the other end is connected to the stator of the electric motor part, and the contact is housed in a housing to form a connector, and the lead wire extends along the extending direction of the lead wire. disposed within a protective member having electrical insulation properties in extending the tubular, wherein said connector is a protected member is connected, rose to offset the unbalance of the mass in the rotating body of the compression mechanism Comprising a Suueito, the balance weight is characterized in that it is arranged within a range of extension of the protective member in the rotation axis direction of the motor unit.

  ADVANTAGE OF THE INVENTION According to this invention, the covering material of the lead wire which supplies power to a stator, and the covering material of the coil of a stator can be protected more reliably than before, and a highly reliable hermetic compressor can be provided.

1 is a longitudinal sectional view of a hermetic compressor according to an embodiment of the present invention. It is a partial expanded sectional view which expands and shows the state of the lead wire vicinity in the sealed compressor of FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 2. (A) is a partial expanded sectional view which expands and shows the state of the lead wire vicinity in the sealed compressor of a comparative example, and is a figure corresponding to FIG. (B) is IVb-IVb sectional drawing of (a), and is a figure corresponding to FIG. It is a partial expanded sectional view which expands and shows the mode of the lead wire vicinity in the hermetic compressor concerning other embodiments of the present invention, and is a figure corresponding to FIG.

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
The hermetic compressor of the present invention has a main characteristic feature in the mounting form of the lead wire that electrically connects the hermetic terminal provided on the side wall of the hermetic container and the motor part.

  Hereinafter, the hermetic compressor of the present invention will be described by taking a horizontal scroll compressor in which the rotating shaft of the electric motor unit is arranged in the horizontal direction as an example. As this horizontal scroll compressor, it is assumed that it is driven by a three-phase AC induction motor and uses, for example, an HFC refrigerant and an ether-based lubricant, but the present invention is not limited to this. The present invention can be implemented in various forms. In the following description, the vertical direction is based on the vertical direction of the arrow in FIG. 1 indicating the vertical direction when the horizontal scroll compressor is arranged in a predetermined refrigeration cycle.

FIG. 1 is a longitudinal sectional view of a scroll compressor S (sealed compressor) according to this embodiment.
The scroll compressor S includes a hermetic container (also referred to as a chamber) 1, an electric motor unit 2 disposed inside the hermetic container 1, and a compression mechanism unit 3 disposed inside the hermetic container 1 and driven by the electric motor unit 2. It is equipped with.

  The hermetic container 1 is composed of a cylindrical tube chamber 1a and lid chambers 1b and 1c that are arranged so as to close the openings at both ends of the tube chamber 1a and are welded. A space (also referred to as a discharge pressure space) 54 is formed.

  In addition, a suction pipe 7 attached to the suction port 4 of the compression mechanism unit 3 is fixedly disposed in the lid chamber 1b by welding or brazing. Further, the discharge port 5 of the compression mechanism unit 3 communicates with a chamber inner space (discharge pressure space) 54, and a discharge pipe 8 communicating the chamber inner space 54 and the outside is welded or brazed to the upper portion of the lid chamber 1c. It is attached and fixedly arranged. The scroll compressor S is a so-called high pressure chamber type compressor in which the chamber inner space 54 is in a high pressure atmosphere.

In addition, oil (lubricating oil) is enclosed in the sealed container 1 at an appropriate stage of assembly. As a result, an oil storage section 9 is formed at the bottom of the sealed container 1.
A hermetic terminal 16, which will be described in detail later, is provided on the upper portion of the cylindrical chamber 1 a of the sealed container 1.

  As described above, the electric motor unit 2 in the present embodiment is composed of a three-phase AC induction motor. The electric motor unit 2 includes a stator 2a and a rotor 2b that rotates around the drive shaft 6 inside the stator 2a.

The stator 2a is fixed to the sealed container 1 by press fitting, welding, or the like. The stator 2a includes a coil (not shown) made of a wound enamel-coated copper wire and a laminated portion (not shown) in which a large number of electromagnetic steel plates are laminated by welding or caulking. Incidentally, coil end portions 2c are formed at both ends of the stator 2a in the extending direction of the drive shaft 6, respectively.
The extending direction of the drive shaft 6 corresponds to the “rotational axis direction of the electric motor unit” in the claims. Hereinafter, the rotation axis direction D1 of the electric motor unit 2 may be simply referred to as “axial direction”.

An air gap (not shown) is formed between the rotor 2b and the stator 2a with a slight gap. The rotor 2b is fixed to the drive shaft 6 as described above, and rotates around the drive shaft 6 with an air gap (not shown) interposed between the rotor 2b and the stator 2a.
Incidentally, one end side of the drive shaft 6 is supported by the main bearing 13 a and the other end side is supported by the auxiliary bearing 10.
Further, the drive shaft 6 has a pin portion 6c, which will be described later, at the distal end on the compression mechanism portion 3 side described below.

  The compression mechanism unit 3 includes a turning scroll 11, a fixed scroll 12, a frame 13, and an Oldham ring 14.

  The orbiting scroll 11 includes a spiral orbiting scroll wrap 11a, a base plate 11b, and an orbiting bearing 11c into which the pin portion 6c that is an eccentric portion of the drive shaft 6 is inserted.

  The fixed scroll 12 has a spiral fixed scroll wrap 12a and a base plate 12b. Moreover, the said suction inlet 4 is arrange | positioned at the outer peripheral part of the fixed scroll wrap 12a, and the said discharge outlet 5 is arrange | positioned in the center part of the fixed scroll wrap 12a.

  The orbiting scroll 11 is disposed to face the fixed scroll 12 so as to be rotatable, and a compression chamber 51 communicating with the suction port 4 is formed by meshing of the orbiting scroll wrap 11a and the fixed scroll wrap 12a.

  The outer peripheral side of the frame 13 is fixed to the inner wall surface of the sealed container 1 by welding, and includes the main bearing 13a that rotatably supports the main shaft of the drive shaft 6. The fixed scroll 12 is fastened and fixed to the frame 13 by bolts.

  The Oldham ring 14 is disposed between the orbiting scroll 11 and the frame 13, and a key portion (not shown) of the Oldham ring 14 includes an orbiting Oldham groove (not shown) formed in the orbiting scroll 11 and a frame. 13 is inserted into a frame Oldham groove (not shown). The Oldham ring 14 is a rotation restricting member that functions to cause the orbiting scroll 11 to orbit with respect to the fixed scroll 12 without causing it to rotate.

  A balance weight 15 is attached to the drive shaft 6 that is approximately in the middle between the electric motor unit 2 and the compression mechanism unit 3. The balance weight 15 cancels the unbalanced weight in which the center of gravity of the orbiting scroll 11 and the axis center of the rotor 2b do not match. The balance weight 15 rotates around the drive shaft 6.

  In such a scroll compressor S, when the rotor 2b rotates around the drive shaft 6, the pin portion 6c performs an eccentric rotational movement. When this eccentric rotation is transmitted to the orbiting scroll 11, the Oldham ring 14 causes the orbiting scroll 11 to rotate with respect to the fixed scroll 12 without rotating.

  In such a scroll compressor S, the orbiting scroll 11 is revolved through the drive shaft 6 by rotating the rotor 2 b of the electric motor unit 2. Thereby, the refrigerant sucked from the suction pipe 7 is compressed in the compression chamber 51 formed between the fixed scroll 12 and the orbiting scroll 11 via the suction port 4. Then, the compressed refrigerant is discharged into the chamber internal space (discharge pressure space) 54 through the discharge port 5. The discharged refrigerant passes through a passage provided on the outer periphery of the frame 13, cools the electric motor unit 2, and then is sent out from the discharge pipe 8 into a predetermined refrigeration cycle outside the sealed container 1.

Next, a mounting form of the lead wire 27 that electrically connects the hermetic terminal 16 and the electric motor unit 2 in the scroll compressor S will be described.
FIG. 2 is a partially enlarged cross-sectional view showing a partially enlarged view of the vicinity of the lead wire 27 in the scroll compressor S of FIG. 3 is a cross-sectional view taken along the line III-III in FIG.

  As shown in FIG. 2, in the scroll compressor S (see FIG. 1) according to the present embodiment, as described above, the electric motor on the inner side from the outside of the hermetic container 1 (see FIG. 1) via the hermetic terminal 16 is used. Power is supplied to the unit 2. Incidentally, the power source is a three-phase power source, and three lead wires 27 that supply power for each UVW phase of a coil (not shown) of the stator 2 a are connected to the hermetic terminal 16.

As shown in FIG. 2, the hermetic terminal 16 is provided on the upper side wall 1d of the sealed container 1 (cylinder chamber 1a).
The hermetic terminal 16 in the present embodiment is configured by having three pin members 17 penetrating in and out of the hermetic container 1 in an airtight seal member 18 provided on the upper side wall 1d.

As shown in FIG. 3, the three pin members 17 are arranged so as to be located at the apexes of an equilateral triangle in a plan view (back view) of the hermetic terminal 16.
As will be described later, the pin member 17 extends into the connector 19 (receptacle). A lead wire 27 is connected to the pin member 17 via a contact 23 described later.

  The contacts 23 are accommodated in the cluster housing 20 and constitute a connector 19 together with the cluster housing 20. The cluster housing 20 corresponds to a “housing” in the claims.

The contact 23 is formed by bending a conductive metal plate.
As shown in FIG. 3, the contact 23 in the present embodiment includes a lead wire holding portion 24, a lead wire energizing portion 25, and a pin member insertion portion 26.

  The lead wire holding portion 24 caulps and holds the coating portion 29 of the lead wire 27, and the lead wire energizing portion 25 caulks and holds the core material 28 of the lead wire 27. Further, the pin member insertion portion 26 is formed by bending the plate body into an annular shape so that the pin member 17 can be fitted.

  As shown in FIGS. 2 and 3, the outer shape of the cluster housing 20 is thin in the radial direction (thickness direction of the upper side wall 1d shown in FIG. 2) of the hermetic container 1 (see FIG. 2) and is axial (motor unit 2). In the direction of the rotation axis D1).

  Further, as shown in FIG. 3, three arrangement holes 21 for arranging the three lead wires 27 are formed inside the cluster housing 20. The three arrangement holes 21 are formed so as to correspond to the three pin members 17, and the three arrangement holes 21 are along the short direction of the cluster housing 20 (the short direction which is not the thickness direction). Are formed in parallel.

Further, as shown in FIG. 2, the pin member 17 is inserted into the upper surface of the cluster housing 20 (the surface facing the inner peripheral surface of the sealed container 1) at a position corresponding to each pin member 17 of the hermetic terminal 16. An insertion hole 22 is formed. The insertion hole 22 communicates with the arrangement hole 21.
Such a cluster housing 20 can be formed using, for example, an electrically insulating resin such as polyester or fluorine resin.

  As shown in FIG. 3, the lead wire 27 includes a core material 28 made of copper and a coating portion 29 that covers the surface of the core material 28. As the coating part 29, for example, an electrically insulating resin such as polyester can be used.

One end of the lead wire 27 is connected to the pin member 17 of the hermetic terminal 16 via the contact 23 as described above.
Further, the lead wire 27 extends toward the electric motor unit 2 along the rotation axis direction D1 of the electric motor unit 2.
The other end of the lead wire 27 is connected to the stator 2a of the electric motor unit 2 as described above.

Moreover, the lead wire 27 in this embodiment is arrange | positioned in the cylindrical protection member 30, as shown in FIG.2 and FIG.3. The protection member 30 in the present embodiment has a quadrangular prism outer shape.
The protection member 30 is connected to the extending end side of the lead wire 27 in the cluster housing 20.

  In the present embodiment, the cluster housing 20 and the protection member 30 are joined by fitting the ends of the cluster housing 20 and the protection member 30 to each other. Incidentally, in this embodiment, although the cluster housing 20 is inserted inside the protective member 30, the protective member 30 can be inserted inside the cluster housing 20. Further, the joining of the cluster housing 20 and the protection member 30 is not limited to the fitting, and may be another joining by adhesion, welding, or the like.

  Further, as shown in FIG. 2, a detachment preventing mechanism 31 is formed at the joint between the cluster housing 20 and the protection member 30. The detachment prevention mechanism 31 in the present embodiment includes, for example, a convex portion 32 formed on the outer side of the end portion of the cluster housing 20 and a concave portion formed on the inner side of the end portion of the protection member 30 to receive the convex portion 32. 33. The detachment prevention mechanism 31 is not limited to this, and any mechanism can be employed as long as it is a locking mechanism between the cluster housing 20 and the protection member 30.

Further, the protection member 30 extends from the cluster housing 20 side toward the stator 2a side. Specifically, the protection member 30 is disposed along the axial direction (the rotational axis direction D1 of the electric motor unit 2) from the cluster housing 20 side.
Incidentally, the protection member 30 in the present embodiment extends to the vicinity of the coil end portion 2c.

As shown in FIG. 2, the balance weight 15 is disposed within the range in which the protection member 30 extends in the rotation axis direction D <b> 1 of the electric motor unit 2.
Such a protective member 30 can be formed of an electrically insulating resin such as polyester or fluororesin.

Next, the effects obtained by the scroll compressor S according to the present embodiment will be described with reference mainly to FIGS. 2 and 3 while comparing with the comparative example.
FIG. 4A is a partially enlarged cross-sectional view showing a partially enlarged view of the vicinity of the lead wire 27 of the comparative example, and corresponds to FIG. 4B is a cross-sectional view taken along the line IVb-IVb of FIG. 4A and corresponds to FIG.

  First, the mounting form of the lead wire 27 in the comparative example will be described. As shown in FIG. 4A, in this comparative example, unlike the present embodiment (see FIGS. 2 and 3), the connector 19 (see FIGS. 3) and the protective member 30 (see FIGS. 2 and 3).

  Further, in this comparative example, as shown in FIG. 4B, unlike the present embodiment (see FIG. 3), the lead wire 27 extending from the hermetic terminal 16 side to the stator 2a of the electric motor unit 2 is rotated. It does not extend along the axial direction D1. In other words, the lead wire 27 extending from the hermetic terminal 16 side has a circumferential direction D2 (see FIG. 4B) of the upper side wall 1d (see FIG. 4A) of the sealed container 1 (see FIG. 4A) on the motor unit 2 side. ))).

In such a comparative example, the lead wire 27 is not fixed to the sealed container 1 (see FIG. 4A) in the middle of extending from the hermetic terminal 16 side toward the motor unit 2 side. 1 (see FIG. 4 (a)) and is moved by being struck by refrigerant or lubricating oil flowing through it. As a result, the lead wire 27 comes into contact with a rotating body such as the rotor 2b (see FIG. 1), the balance weight 15 (see FIG. 4A), or the upper side wall 1d of the sealed container 1 (see FIG. 4A). The lead wire 27 comes into contact with (see FIG. 4A). In particular, if the lead wire 27 is biased so as to be displaced in the circumferential direction D2 (see FIG. 4B) of the sealed container 1, the lead wire 27 is likely to rub against the sealed container 1.
Therefore, in such a comparative example, the coating film (not shown) of the lead wire 27 is worn, and the core wire (not shown) may be exposed to cause an electrical short circuit accident.

On the other hand, in the present embodiment, the lead wire 27 is extended along the axial direction (the rotational axis direction D1 of the electric motor unit 2) to electrically connect the hermetic terminal 16 and the stator 2a, and The existing lead wire 27 is covered with the protective member 30. In general, the connector 19 used for preventing electric shock at the joint portion of the lead wire 27 is used to support the protective member 30 in the sealed container 1 that is not directly touched by the human body in this embodiment. ing. That is, the lead wire 27 and the hermetic terminal 16 are electrically connected via the connector 19 attached to the hermetic terminal 16, and the cluster housing 20 and the protection member 30 are supported by the connector 19. And are joined.
Therefore, according to the present embodiment, the coating member 29 (see FIG. 3B) of the lead wire 27 can be reliably protected by the protection member 30.

  Moreover, according to this embodiment, since the protection member 30 can be supported by the sealed container 1 via the connector 19 and the hermetic terminal 16, the protection member 30 and the lead wire 27 accommodated in the protection member 30 are provided. Interference with rotors such as the rotor 2b (see FIG. 1) and balance weight 15 can be avoided.

  Moreover, in this embodiment, since the lead wire 27 is supported by the airtight container 1 via the protective member 30, the connector 19, and the hermetic terminal 16, the conventional sealing which hold | maintained the edge part of the lead wire on the stator with the holder. Unlike the mold compressor (for example, refer to Patent Document 2), the covering material of the stator coil (enamel-coated copper wire) is not damaged by the holder. That is, according to the present embodiment, it is possible to avoid the occurrence of rare shorts due to damage to the coil covering material.

  In addition, the scroll compressor S according to the present embodiment exhibits the above-described effects, so that at the time of start-up, the horizontal type in which the lubricating oil is easily wound up in the sealed container 1 by the rotation of the rotor 2b and the balance weight 15, and the rotation This has great significance in that the present invention can be applied to one in which the balance weight 15 is disposed within the extending range of the protection member 30 in the axial direction D1.

As mentioned above, although this embodiment was described, this invention is not limited to the said embodiment, It can implement with a various form.
In the above embodiment, the protective member 30 and the cluster housing 20 are described as separate members, but the present invention is not limited to this.

  FIG. 5 is a partially enlarged cross-sectional view showing a state in the vicinity of the lead wire 27 in a scroll compressor S (see FIG. 1) according to another embodiment of the present invention, and corresponding to FIG. It is. In FIG. 5, the same components as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

In this other embodiment, as shown in FIG. 5, the protection member 30 and the cluster housing 20 are integrally formed.
According to such an embodiment, the number of parts can be reduced.
In FIG. 5, reference numeral 1 is a sealed container, reference numeral 2 is an electric motor part, reference numeral 16 is a hermetic terminal, reference numeral 17 is a pin member, reference numeral 19 is a connector, Reference numeral 23 denotes a contact.

  Moreover, in the said embodiment, although the protection member 30 has a quadrangular prism-shaped external shape, in this invention, it is not limited to this, Polygon other than circular, an ellipse, and a rectangle is shown by sectional view. It can also be a cylindrical body.

  Moreover, in the said embodiment, although the protection member 30 is formed in a cylinder shape and the three lead wires 27 are stored together inside the protection member 30, the protection member 30 provides a partition inside the protection member 30. The three lead wires 27 can be configured to be stored individually.

1 Sealed container 1d Upper side wall (side wall)
DESCRIPTION OF SYMBOLS 2 Electric motor part 2a Stator 2b Rotor 2c Coil end part 3 Compression mechanism part 6 Drive shaft 6c Pin part 7 Suction pipe 8 Discharge pipe 9 Oil storage part 10 Sub bearing 11 Orbiting scroll 12 Fixed scroll 13 Frame 13a Main bearing 14 Oldham ring 15 Balance weight 16 Hermetic terminal 17 Pin member 19 Connector 20 Cluster housing (housing)
23 Contact 27 Lead wire 28 Core material 29 Coating part 30 Protective member 31 Desorption prevention mechanism 51 Compression chamber D1 Rotating shaft direction S Scroll compressor

Claims (4)

A hermetic compressor that houses a compression mechanism portion that compresses refrigerant gas and an electric motor portion that drives the compression mechanism portion in a sealed container,
A hermetic terminal that is provided on a side wall of the sealed container and supplies power to the motor unit;
A lead wire having one end connected to the hermetic terminal via a contact and extending toward the electric motor unit along the rotation axis direction of the electric motor unit and the other end connected to the stator of the electric motor unit; With
The contacts are housed in a housing to form a connector;
The lead wire is disposed within a protective member having an electrical insulating property in a cylindrical shape extending along the extending direction of the lead wire,
The connector and the protective member are connected ,
A balance weight that cancels out the mass imbalance in the rotating body of the compression mechanism section;
The hermetic compressor is characterized in that the balance weight is disposed within a range in which the protection member extends in a rotation axis direction of the electric motor unit .   The hermetic compressor according to claim 1, wherein the connector and the protection member are connected by being fitted to each other.   The hermetic compressor according to claim 1, wherein the connector and the protection member are connected by being integrally formed.   2. The hermetic compressor according to claim 1, wherein the hermetic compressor is a horizontal compressor disposed so that a rotating shaft of the electric motor unit extends along a horizontal direction.

Images