JP2002235666A - Hermetically sealed compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetically sealed compressor capable of securing lubrication efficiency by reducing the oil discharge quantity to the outside and capable of improving reliability with a structure causing no short circuit accident nor a grounding accident. SOLUTION: A motor part 3 and a compression mechanism part 4 connected to each other through a rotating shaft 2a are accommodated in a sealed case 1. The motor part is constituted of a rotator 6 fitted and fixed onto the rotating shaft, and a stator 7A equipped with an inner peripheral surface having a narrow space from a peripheral surface of the rotator and fitted and fixed on an inner periphery of the sealed case. The stator is provided with a stator iron core 11 wherein a coil 18 is wound around plural pole teeth 17 respectively, and a terminal plate 12 equipped with a lead wire 13 attached and fixed on an end surface of the stator iron core and electrically connected to the coil. A baffle plate S or a baffle cylinder Sa, which is an oil separation mechanism for separating lubricating oil contained in a high pressure gas compressed in the compression mechanism part and delivered to the sealed case is installed on the terminal plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor, and more particularly, to a method in which lubricating oil for lubricating a compression mechanism is discharged to the outside together with a compressed high-pressure gas. It relates to improvement of the suppression structure.

[0002]

2. Description of the Related Art FIG. 6 shows a hermetic compressor which is conventionally frequently used in, for example, a refrigeration cycle circuit. Here, an accumulator A and two refrigerant suction pipes a, a are shown.
Connected through.

In the hermetic compressor, an upper motor section 3 and a lower compression mechanism section 4 connected via a rotary shaft 2 are accommodated in a closed case 1. A lubricating oil reservoir 5 is formed at the inner bottom of the closed case 1, and the compression mechanism 4
Are partially immersed.

The electric motor section 3 has a rotor 6 fitted and fixed to the rotating shaft 2 and an inner peripheral surface having a small gap with the peripheral surface of the rotor 6. And a fixed stator 7.

Here, as the compression mechanism 4, a so-called twin rotary type having two cylinder chambers 8a and 8b is used. With the rotation of the rotary shaft 2, the compression mechanism 4 compresses the refrigerant gas and discharges the refrigerant gas into the closed case 1, and at the same time, sucks up the lubricating oil from the reservoir 5 and supplies the sliding parts of the compression mechanism 4 with oil. It is supposed to.

A part of the lubricating oil supplied to the compression mechanism 4 lubricates the sliding portions in the cylinder chambers 8a and 8b, and then mixes with the compressed and high-pressure gas.
It is discharged into the closed case 1.

That is, the lubricating oil floats and fills in the sealed case 1 together with high-pressure gas as fine oil droplets. If it is left as it is, it will be guided together with the high-pressure gas from the refrigerant discharge pipe b connected to the closed case 1 to the external refrigeration cycle equipment. The so-called oil discharge amount increases, and the amount of lubricating oil in the pool portion 5 decreases, eventually leading to a burning phenomenon of the sliding portion.

Therefore, an oil separating disk 9 is attached to the upper end of the rotating shaft 2. The air-fuel mixture of the high-pressure gas and the oil of the lubricating oil compressed by the compression mechanism unit 4 is formed by a gap between the rotor 6 and the stator 7 constituting the electric motor unit 4 and a winding of the stator 7. After rising through the gap, the oil separation disk 9
Collide with

Since the rotating shaft 2 is rotating at a high speed,
The centrifugal action acts on the oil separating disk 9 to separate high-pressure gas and oil from the air-fuel mixture. The high-pressure gas rises and is guided to the discharge refrigerant pipe b, and the oil scatters on the peripheral wall of the sealed case 1, and then flows down along an oil return passage (not shown) provided on the outer peripheral surface of the stator 7, and accumulates. To return to.

[0010]

However, since the oil separating disk 9 is mounted and fixed to the upper end of the rotating shaft 2 rotating at a high speed via a mounting tool, an extremely strong mounting is achieved. Necessary, leading to increased costs.

A lead wire c connected to the windings of the stator 7 is provided in the sealed case 1.
It is connected to a three-phase terminal D attached to the upper end.
Since the closed case 1 has a closed structure, it cannot be confirmed whether or not the lead wire c is in contact with the oil separation disk 9 in the assembled state.

It is conceivable that the lead wire c contacts the oil separating disk 9. In this case, the rotating oil separation disk 9
The lead wire c may be entangled or the cover of the lead wire c may be shaved, which may eventually lead to a short circuit accident or a ground fault accident.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a configuration in which there is no possibility of a short-circuit accident or a ground fault accident of a lead wire,
It is an object of the present invention to provide a hermetic compressor capable of ensuring lubricity by reducing the amount of lubricating oil discharged to the outside and ensuring improved reliability.

[0014]

According to a first aspect of the present invention, there is provided a hermetic compressor comprising an electric motor section and a compression mechanism section which are connected via a rotary shaft in a closed case. In the hermetic compressor to be housed, the electric motor section includes:
A rotor fitted and fixed to the rotating shaft, and a stator fitted with an inner peripheral surface having a predetermined gap from the peripheral surface of the rotor and fixedly attached to the inner periphery of the sealed case, wherein the stator is fixed A stator body in which windings are concentratedly wound around a plurality of magnetic pole teeth of a child core, and a terminal plate having a lead wire attached and fixed to an upper end surface of the stator body and electrically connected to the windings. An oil separating means attached to the terminal plate for separating lubricating oil contained in the high-pressure gas compressed by the compression mechanism and discharged into the sealed case.

According to a second aspect of the present invention, in the hermetic compressor according to the first aspect, the oil separating means stops an air-fuel mixture of the high-pressure gas and the lubricating oil which is compressed by the compression mechanism and discharged into the closed case. It is characterized by being a baffle plate.

According to a third aspect of the present invention, in the hermetic compressor according to the first aspect, the oil separating means covers the opening end of the discharge pipe for leading the high-pressure gas from the closed case to the outside with a predetermined gap. It is characterized by being a cylindrical body.

According to the first to third aspects of the present invention, by adopting means for solving the above problems,
Since the oil separating means is attached to the terminal plate which is fixed to the stator main body, even if the lead wire contacts the oil separating means, there is no danger of a short circuit accident or a ground fault accident occurring. The lubrication is secured by reducing the amount of oil discharged to the outside, and the reliability can be improved.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. The hermetic compressor uses a closed case 1
Inside, the electric motor unit 3 and the compression mechanism unit 4 connected via the rotating shaft 2a are accommodated. A lubricating oil reservoir 5 is formed at the bottom of the closed case.

The lower end of the rotary shaft 2a is immersed in the lubricating oil of the reservoir 5, and the lower end of the rotary shaft 2a sucks up the lubricating oil of the reservoir 5 with the rotation of the rotary shaft 2a. An oil pump (not shown) for supplying oil to each sliding portion of the portion 4 is provided.

The compression mechanism 4 has two cylinder chambers 8
What is called a twin rotary type provided with a and 8b is used. Eccentric rollers 10a and 10b are accommodated in the respective cylinder chambers 8a and 8b so as to be eccentrically rotatable, respectively.
In addition, the tip of the vane is always in elastic contact with the peripheral surface of the eccentric roller.

The cylinder chambers 8a and 8b are provided with a suction port and a discharge port via vanes, and the vanes partition the cylinder chamber into a high pressure side and a low pressure side. A suction refrigerant pipe a, a extending from the accumulator A is provided at the suction port.
Is connected, and the discharge port communicates with the inside of the closed case 1.
(The vane, the suction port, and the discharge port are not shown in detail.) As the compression mechanism 4, a so-called twin rotary type is adopted, but the present invention is not limited to this, and a so-called scroll type compression is used. It may be a mechanism section or the like.

The motor section 3 includes a rotor 6 fitted and fixed to the rotating shaft 2a, and an inner peripheral surface having a small gap with the peripheral surface of the rotor. And a fixed stator 7A.

The stator 7A includes a stator main body 11 and a terminal plate 12 attached and fixed to an upper end face of the stator main body, as will be described later. 6 does not protrude from the upper end surface, and is immersed downward by a predetermined amount.

Further, an oil separating mechanism (oil separating means) S as a feature of the present invention is disposed further above the stator main body 11 and the terminal plate 12 constituting the stator 7A. Specifically, the oil separating mechanism S is a baffle plate attached to the terminal plate 12, and is a disk having a diameter slightly smaller than the inner diameter of the sealed case.

FIG. 2 shows a state before the terminal plate 12 is attached to the stator main body 11 and assembled in order to constitute the stator 7A. A plurality of lead wires 13 are wired to the terminal plate 12, and these lead wires 13 are bundled into one, and a power supply connector 14 is connected to the end.

The diameter of the baffle plate S is larger than the diameter of the terminal plate 12, and a plurality of holes 1
5 are provided, and a plurality of mounting legs 16 are protruded from the lower surface side at a predetermined interval.

The baffle plate S is mounted and fixed to the terminal plate 12 by inserting the mounting legs 16 into the terminal plate 12. In this state, the baffle plate S and the terminal plate 12 are designed to have a predetermined gap, and the hole 15 of the baffle plate S is completely open without being closed.

FIG. 3A shows the terminal plate 12 excluding the lead wires.
FIG. 3B shows a plan view of the stator main body 11. First, the stator body 11 will be described. A plurality of magnetic pole teeth 17 are integrally formed radially along the inner peripheral portion at a predetermined interval, and each magnetic pole tooth 17 of the annular stator core is formed of an insulating member. , And the winding 18 is concentratedly wound thereon.

A plurality of winding terminal receiving portions 19 are provided along the outer periphery of the upper surface of the stator core at predetermined intervals, and one winding terminal 18a drawn from the winding 18 starts winding. The terminal is mounted on the winding terminal receiving portion 19 as a terminal.

The winding 1 located at a position facing the winding 18
One of the winding terminals 18a drawn from the winding 8 is mounted on another winding terminal receiving portion 19 as a winding end terminal. After each winding terminal 18a is mounted on each winding terminal receiving portion 19, a stator connecting member (not shown) is inserted for fixing.

Next, the terminal plate 12 will be described. The terminal plate 12 is formed in an annular shape so as to fit on the upper surface of the stator main body 11, and a guide for superposing two lead wires 13 in a circumferential direction of the stator 7A. A groove 20 is provided.

A lead wire receiving portion 21 for accommodating a lead wire side connection member (not shown) is provided along the guide groove 20. The lead wire receiving portion 21 is connected to the terminal plate 1.
When mounting 2 on the upper surface of the stator core 11, it is located at a position facing the winding end receiving portion 19 on the upper surface of the stator core 11.

The lead wire 13 is routed around the guide groove 20,
One terminal is disposed in the lead wire receiving portion 21 and is fixed by the lead wire side connecting member. After each lead wire 13 is drawn out from the lead wire outlet 22, the terminal of the other lead wire 13 is connected to the power supply connector 14.
Connected to.

The terminal plate 12 thus assembled
Is attached to the upper surface of the stator main body 11. At the same time, the terminal of the winding 13 wound on the stator main body 11 and the lead wire 13 provided on the terminal plate 12 are electrically connected to each other.

Thereafter, mounting legs 16 projecting from the lower surface of the baffle plate S are attached to the terminal plate 12 to fix and hold the baffle plate S. The lead wire 13 is drawn out from the periphery of the baffle plate S, and the power supply connector 14 at the tip is fitted into a three-phase terminal portion D provided on the upper end surface of the sealed case 1. Note that an insertion hole for inserting the lead wire 13 into the baffle plate S may be provided. In any case, lead line 1
There is a possibility that the middle part of 3 will come into contact with the peripheral edge of the baffle plate S, but there is no hindrance to the lead wire 13 as described later.

As shown in FIG. 1 again, while the compression mechanism 4 is configured, a discharge refrigerant pipe b is connected to the upper surface of the closed case 1 and communicates with a condenser (not shown). A suction refrigerant pipe e is connected to an upper surface of the accumulator A and communicates with an evaporator (not shown).

An expansion mechanism is connected between the condenser and the evaporator, and constitutes a refrigeration cycle which sequentially communicates with the accumulator A via a sealed compressor-condenser-expansion mechanism-evaporator. Is done.

In the hermetic compressor constructed as described above, when the electric motor section 3 is energized, the rotating shaft 2a is driven to rotate, and the cylinder chamber 8 constituting the compression mechanism section 4 is rotated.
The eccentric rollers 10a and 10b eccentrically rotate within the positions a and 8b.

The refrigerant evaporated by the evaporator is guided from the accumulator A into the cylinder chambers 8a, 8b via the suction pipes a, a and the suction port. Eccentric rollers 10a, 1
By the eccentric rotation of 0b, the refrigerant gas sucked into the cylinder chambers 8a and 8b is gradually compressed.

When the eccentric rollers 10a and 10b make one rotation, the gas in the cylinder chambers 8a and 8b rises to a predetermined pressure and is discharged from the discharge port into the closed case 1. At the same time, the suction stroke in the cylinder chambers 8a and 8b proceeds,
And it changes to the compression process. The inside of the closed case 1 is filled with a high-pressure gas, and is discharged from the discharge refrigerant pipe b to the condenser.
Then, a known refrigeration cycle is configured.

With the compression action on the refrigerant gas,
The lubricating oil collected at the inner bottom of the closed case 1 is sucked up by an oil pump provided at the lower end of the rotating shaft 2a.
Then, it is guided to each sliding portion via an oil supply passage formed in the rotating shaft 2a, and the lubricity is maintained.

A part of the lubricating oil supplied to the compression mechanism 4 is guided to the cylinder chambers 8a and 8b to lubricate the sliding parts, and then forms a mist in the compressed and high-pressure gas. They are mixed and discharged into the closed case 1.

As shown in FIG. 4, a mixture of high-pressure gas and oil droplets of lubricating oil (solid arrows) is wound around the gap between the rotor 6 and the stator 7A constituting the motor unit 3 and around the stator 7A. It rises through the gap between the windings 18 to be mounted.

Then, the air-fuel mixture collides with the baffle S at a position above the stator 7A. Hole 15 provided in baffle S
Is not provided at a position facing the gap between the rotor 6 and the stator 7A through which the air-fuel mixture passes, and is not provided at a position facing the gap between the windings 18 of the stator 7A. The mixture is stopped by the baffle S.

Since the pressure of the air-fuel mixture is high, the air-fuel mixture collides with the baffle S at a considerable airflow velocity. Therefore, a centrifugal action acts on the air-fuel mixture in the baffle S, and the air-fuel mixture is separated into high-pressure gas and oil.

The separated high-pressure gas (broken-line arrow) flows along the baffle plate S and rises through the hole 15 from a place where the specific gravity is light. Thereafter, the refrigerant is guided from the discharge refrigerant pipe b to an external condenser.

On the other hand, the separated lubricating oil (alternate long and short dash line) flows along the baffle plate S and drops from a portion having a high specific gravity. Then, the oil flows down the oil return passage 23 provided on the outer peripheral surface of the stator 7A, and returns to the above-described reservoir 5.

As described above, since the baffle plate S as an oil separating mechanism is attached to the terminal plate S of the stator 7A, which is a fixed portion,
Unlike a conventional configuration in which an oil separation disk is mounted on a rotating shaft, centrifugal force and imbalance do not become a problem, and a strong and highly accurate mounting and fixing is not required.

Lead wire 1 extending from terminal plate 12
Even if 3 is in contact with the periphery of the baffle S, the baffle S is fixed, so there is no problem with the lead wire 13 and there is no danger of a short circuit or ground fault.

An oil separating mechanism (oil separating means) Sa as shown in FIG. 5 may be used. The electric motor unit 3 and the compression mechanism unit 4 connected via the rotary shaft 2a are housed in the closed case 1, and the electric motor unit 3 is connected to the rotor 6 fitted and fixed to the rotary shaft 2a. The compression mechanism 4 includes a stator 7A fitted and fixed to the inner periphery of the case 1, and the compression mechanism 4 is a so-called twin rotary type.

The stator 7A has been described with reference to FIGS.
As described in (A) and (B), the stator body 11 in which the windings 18 are concentratedly wound around the plurality of magnetic pole teeth 17 of the stator core, respectively, and the stator body 11 is attached and fixed to the upper end surface of the stator body 11 and wound. The same applies to the provision of the terminal plate 12 having the lead wire 13 electrically connected to the wire 18.

The oil separating mechanism Sa is a baffle cylinder which is attached and fixed to the inner peripheral portion of the terminal plate 12 by appropriate means, and is integrally formed with a cylindrical portion n having a predetermined inner diameter and a lower end of the cylindrical portion n. And a flange m formed in

Here, the discharge refrigerant pipe b1 connected to the upper end surface of the closed case 1 is formed so as to protrude into the closed case 1 by a predetermined amount. The protruding portion of the discharge refrigerant pipe b1 in the case 1 is inserted into the cylindrical portion n that forms the obstructing cylindrical body Sa.

As compared with the outer diameter of the discharge refrigerant pipe b1, the inner diameter of the cylindrical portion n of the baffle cylindrical body Sa is formed to be large, and there is a narrow gap between them. In addition, the flange m of the cylinder Sa for disturbing
A sufficient space is formed between the outer diameter and the inner diameter of the terminal plate 12.

With such a structure, the mixture of the high-pressure gas and the oil droplets of the lubricating oil discharged from the compression structure 4 is formed by the gap between the rotor 6 and the stator 7A constituting the motor unit 3. Alternatively, it rises through the gap between the windings 18 of the stator 7A, and further rises between the terminal plate 12 and the baffle cylinder Sa.

Then, the air-fuel mixture is guided from the position where the obstruction cylinder Sa is present to the upper portion of the closed case 1 without being short-circuited to the discharge refrigerant pipe b1. The oil component of the lubricating oil having a large specific gravity collides with the inner surface of the sealed case 1, flows down along the inner surface, and only the refrigerant gas is discharged from the discharge refrigerant pipe b1.

Only the completely separated oil is supplied to the oil return passage 23 provided on the outer peripheral surface of the stator 7A shown in FIG.
, And returns to the above-mentioned pool portion 5.

Also in this case, the terminal plate 1 constituting the stator 7A
Since the baffle cylinder Sa as the oil separating mechanism is mounted on the second unit 2, the problem of centrifugal force and unbalance can be avoided, and a rigid and highly accurate mounting and fixing is not required.

Even if the lead-out line 13 extending from the terminal plate 12 is in contact with the baffle cylinder Sa, the draw-out line 13 does not cause any trouble because the baffle cylinder Sa is fixed. There is no danger of a short circuit of the lead wire 13 or occurrence of a ground fault accident.

In the above embodiment, the baffle plate S and the baffle cylinder Sa are separate from the terminal plate 12, but the present invention is not limited to this.
a may be made of synthetic resin and integrally formed with the terminal plate 12.

[0061]

As described above, according to the present invention, since the oil separating means is mounted on the terminal plate of the stator constituting the motor section, if the centrifugal force or imbalance caused by mounting on the rotating shaft is a problem. This eliminates the need for a rigid and highly accurate mounting and fixing, thereby reducing costs.

Even if the lead wire extending from the terminal plate is in contact with the oil separating means, since the oil separating means is fixed, there is no danger of a short circuit of the lead wire or occurrence of a ground fault, and the reliability is improved. This has the effect of improving the performance.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a hermetic compressor provided with an oil separating mechanism, showing an embodiment of the present invention.

FIG. 2 is an exploded view of a stator core constituting a stator of an electric motor unit and a terminal plate to which an oil separating mechanism is attached, showing the embodiment.

FIG. 3 is a perspective view of a terminal plate and a plan view of a stator core, showing the same embodiment.

FIG. 4 is a view illustrating the same embodiment and illustrating an oil separating function of a baffle plate.

FIG. 5 is a schematic cross-sectional view of a hermetic compressor provided with an oil separation mechanism, showing another embodiment.

FIG. 6 is a schematic sectional view of a conventional hermetic compressor having an oil separation disk.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Closed case, 2a ... Rotating shaft, 3 ... Electric motor part, 4 ... Compression mechanism part, 6 ... Rotor, 7A ... Stator, 18 ... Winding, 11 ... Stator iron core, 13 ... Lead wire, 12 ... Terminal Plate, S: baffle plate, Sa: cylinder for baffle.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F04C 29/02 351 F04C 29/02 351A F-term (Reference) 3H003 AA05 AB04 AC03 BH06 CF01 CF04 3H029 AA05 AA09 AA13 AA21 AB03 AB08 BB05 BB35 BB47 CC09 CC25 CC44

Claims (3)

[Claims] 1. A hermetic compressor in which a motor portion and a compression mechanism portion connected via a rotating shaft are housed in a sealed case, wherein the motor portion is fixedly fitted to the rotating shaft. And a stator provided with an inner peripheral surface having a predetermined gap with the rotor peripheral surface, the stator being fitted and fixed to the inner periphery of the sealed case, wherein the stator has a plurality of magnetic pole teeth of a stator core. A stator body in which each winding is concentratedly wound, and a terminal plate provided with a lead wire attached and fixed to an end face of the stator body and electrically connected to the winding, A hermetic compressor characterized by comprising an oil separating means mounted thereon for separating lubricating oil contained in the high-pressure gas compressed by the compression mechanism and discharged into the sealed case. 2. The oil separating means according to claim 1, wherein said oil separating means is a baffle plate for stopping a mixture of high-pressure gas and lubricating oil which is compressed by said compression mechanism and discharged into a closed case. 2. The hermetic compressor according to 1. 3. The baffle cylinder as set forth in claim 1, wherein the oil separating means covers a predetermined gap from an opening end of a discharge pipe for leading high-pressure gas from the sealed case to the outside.
The hermetic compressor as described.