JP2016109046A - Hermetic electric compressor and air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic electric compressor capable of keeping the reduced number of components and reduced assembling man-hours while suppressing occurrence of distortion in a fixed scroll in a mounting process of a back pressure control mechanism.SOLUTION: A hermetic electric compressor (scroll compressor S) includes a mounting hole (back pressure valve hole 43) disposed on a compression mechanism (fixed scroll 12), and a press-fit member 20 press-fitted so as to close an opening of the mounting hole. The press-fit member 20 has a press-fit portion 21 and a diameter-reduction portion 22 formed so that its outer diameter is reduced, formed toward a press-fitting direction to the mounting hole. In the press-fit member 20, a hole (counter-bored hole 25) longer than a length of the press-fit portion 21 in the press-fitting direction is formed from the press-fit portion 21 to the diameter reduction portion 22.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a hermetic electric compressor and an air conditioner including the same.

  Conventionally, as a scroll compressor that is a hermetic type electric compressor, a back pressure control mechanism that forms a compression chamber between a fixed scroll and a turning scroll and controls the pressure of a back pressure chamber provided at the back of the turning scroll. What is provided with is known. The back pressure control mechanism is configured by providing a back pressure control valve in the middle of the communication path formed in the fixed scroll so as to communicate the compression chamber and the back pressure chamber. The back pressure control valve is disposed through a back pressure valve hole formed in the fixed scroll so as to face the communication path. The back pressure valve hole after the back pressure control valve is disposed is closed by a closing member that is press-fitted from the opening side. The closing member is press-fitted into the back pressure valve hole by an interference fit with a tightening allowance of several tens of μm.

  By the way, the press-fitting of the closing member into the back pressure valve hole causes the fixed scroll to be distorted. And if the distortion which arose in the fixed scroll is large, the adhesiveness between the turning scroll which forms a compression chamber will be inhibited. In particular, under the operating conditions of the low speed and low pressure ratio, the scroll compressor has a reduced efficiency due to leakage loss.

Therefore, a scroll compressor is disclosed in which the closing member is divided into two members, a back pressure pin and a fitting part arranged adjacent to the back pressure control valve, and only the fitting part is press-fitted into the back pressure valve hole. (For example, refer to Patent Document 1).
According to such a scroll compressor, since only one fitting component divided into two members is press-fitted, distortion generated in the fixed scroll is reduced.

JP 2007-224839 A

However, in the conventional scroll compressor (for example, refer patent document 1), the number of parts of a closure member increases, and an assembly man-hour also increases.
Therefore, a hermetic electric compressor is desired that can suppress the occurrence of distortion in a compression mechanism such as a fixed scroll in the mounting process of a back pressure control mechanism such as a back pressure control valve and can keep the number of parts and assembly man-hours small. It is rare.

  Accordingly, an object of the present invention is to provide a hermetic electric compressor capable of maintaining a small number of parts and assembly man-hours while suppressing occurrence of press-fitting distortion in a compression mechanism, and an air conditioner including the same. is there.

  The hermetic electric compressor of the present invention that has solved the above problems includes a compression mechanism that compresses sucked refrigerant and discharges it into a refrigeration cycle, and an electric motor that drives the compression mechanism in a hermetic container, and a lubricating oil. Is a hermetic-type electric compressor that includes a mounting hole provided in the compression mechanism, and a press-fitting member that is press-fitted into the mounting hole, and the press-fitting member includes a press-fitting portion; A reduced diameter portion formed so as to have a smaller outer diameter is formed toward the press-fitting direction into the mounting hole, and the press-fitting member is longer than the length of the press-fitting portion in the press-fitting direction. A hole is formed from the press-fit portion to the reduced diameter portion.

  In addition, an air conditioner that solves the above-described problems includes a refrigerant circuit in which the hermetic electric compressor, the condenser, the expander, and the evaporator are sequentially connected in a ring shape and the refrigerant flows. And

  According to the present invention, it is an object to provide a hermetic electric compressor capable of maintaining a small number of parts and assembly man-hours while suppressing occurrence of press-fitting distortion in a compression mechanism, and an air conditioner including the same.

It is composition explanatory drawing of the air conditioner which concerns on embodiment of this invention. 1 is a cross-sectional view of a hermetic electric compressor according to an embodiment of the present invention. FIG. 3 is a partial enlarged cross-sectional view around a back pressure control mechanism in the hermetic electric compressor of FIG. 2. It is sectional drawing of the press-fitting member press-fitted so that the opening of an attachment hole may be plugged up. It is sectional drawing of the press-fit member which concerns on the 1st modification of the press-fit member of FIG. It is sectional drawing of the press fit member which concerns on the 2nd modification of the press fit member of FIG. It is sectional drawing of the press-fit member which concerns on the 3rd modification of the press-fit member of FIG. It is a graph which shows the magnitude | size of the distortion which generate | occur | produces in a compression mechanism when a press-fit member is press-fitted in the attachment hole of a compression mechanism.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In the present embodiment, a hermetic electric compressor will be described taking a scroll compressor as an example.
As will be described in detail later, this scroll compressor has a structure in which the press-fitting distortion of the fixed scroll is reduced, and a predetermined press-fitting member for press-fitting into a back pressure valve hole (mounting hole) drilled in the fixed scroll. It has the main features in the press-fit structure.
Below, after demonstrating the whole structure of an air conditioner provided with this scroll compressor, a scroll compressor is demonstrated.

<Overall configuration of air conditioner>
FIG. 1 is a diagram illustrating the configuration of an air conditioner 101 according to the present embodiment.
As shown in FIG. 1, an air conditioner 101 includes a scroll compressor S, a four-way valve 102, an air conditioner / throttle device 103 such as an expander, an indoor heat exchanger 104, and an outdoor heat exchanger 105 in a predetermined pipe 106. It is connected to the.

  This air conditioner 101 is a cooling operation that uses the indoor heat exchanger 104 as an evaporator and the outdoor heat exchanger 105 as a condenser by switching the four-way valve 102, and the indoor heat exchanger 104 as a condenser and an outdoor heat exchange. This is a heat pump type that performs heating operation using the vessel 105 as an evaporator. In FIG. 1, a solid line arrow X indicates the refrigerant circulation direction during the cooling operation, and a broken line arrow Y indicates the refrigerant circulation direction during the heating operation.

  For example, in the air conditioner 101 during cooling operation, the high-temperature and high-pressure refrigerant compressed by the scroll compressor S passes through the four-way valve 102 and flows into the outdoor heat exchanger 105, and dissipates heat by exchanging heat with air. And condense. Thereafter, the refrigerant is expanded by equal enthalpy by the air conditioning and expansion device 103 and flows into the indoor heat exchanger 104 as a gas-liquid two-phase flow in which a gas refrigerant and a liquid refrigerant are mixed at a low temperature and a low pressure. Then, the liquid refrigerant in the indoor heat exchanger 104 is vaporized into a gas refrigerant by an endothermic action from the air. That is, when the liquid refrigerant is vaporized, the indoor heat exchanger 104 cools the surrounding air, whereby the air conditioner 101 exhibits a cooling function. Next, the refrigerant that has exited the indoor heat exchanger 104 returns to the scroll compressor S and is compressed to a high temperature and a high pressure, and the four-way valve 102, the outdoor heat exchanger 105, the cooling / heating expansion device 103, and the indoor heat exchanger 104 are again connected. Circulate. That is, a refrigeration cycle is configured by repeating this circulation.

<Scroll compressor>
FIG. 2 is a cross-sectional view of the scroll compressor S according to the present embodiment.
As shown in FIG. 2, the scroll compressor S is a vertical scroll compressor and uses, for example, R32 refrigerant as a refrigerant (working fluid).

  The scroll compressor S includes an airtight container (also referred to as a chamber) 1, an electric motor 2 disposed inside the airtight container 1, a scroll compression mechanism 3 disposed inside the airtight container 1 and driven by the electric motor 2, and an electric motor 2 and a crankshaft 6 for transmitting the rotational power of 2 to the scroll compression mechanism 3. The press-fit structure as a main feature of the scroll compressor S according to the present embodiment will be described in detail later together with the description of the back pressure control valve 45 (back pressure control mechanism 40) constituting the scroll compression mechanism 3. To do.

  The sealed container 1 includes a cylindrical tube chamber 1a, a lid chamber 1b welded to the upper portion of the tube chamber 1a, and a bottom chamber 1c welded to the lower portion of the tube chamber 1a, and is sealed inside. A chamber internal space (also referred to as a discharge pressure space) 54 is formed.

  Further, a suction pipe 7 attached to the suction port 4 of the scroll compression mechanism 3 (fixed scroll 12) is fixedly disposed in the lid chamber 1b by welding or brazing. Further, the discharge port 5 of the scroll compression mechanism 3 (fixed scroll 12) communicates with a chamber inner space (discharge pressure space) 54, and a discharge pipe communicates between the chamber inner space 54 and the outside on the side surface of the cylindrical chamber 1a. 8 is fixedly arranged by welding or brazing. 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.

  The electric motor 2 includes a stator 2a and a rotor 2b. The stator 2a is fixed to the sealed container 1 by shrink fitting or welding. The rotor 2b is rotatably arranged in the stator 2a. A crankshaft 6 is fixed to the rotor 2b.

  The crankshaft 6 includes a main shaft and a pin portion 6c that is an eccentric portion. The main shaft of the crankshaft 6 is supported by a main bearing 13 a provided on a frame 13 described later, and the lower side is supported by a lower bearing 10. When the electric motor 2 is driven and the crankshaft 6 is rotated, the pin portion 6c is eccentrically rotated with respect to the main shaft. Further, the crankshaft 6 is provided with an oil supply vertical hole 6a and an oil supply horizontal hole 6b for supplying the oil in the oil storage part 9 to the main bearing 13a, the lower bearing 10 and the swing bearing part 11c described later.

  The scroll compression mechanism 3 includes a turning scroll 11, a fixed scroll 12, a frame 13, an Oldham ring 14, a release valve device 15, and a back pressure control valve 45 that is a component of the back pressure control mechanism 40. ing.

  The orbiting scroll 11 has a spiral orbiting scroll wrap 11a, an orbiting end plate 11b, and an orbiting bearing portion 11c into which a pin portion 6c that is an eccentric portion of the crankshaft 6 is inserted.

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

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

  The outer peripheral side of the frame 13 is fixed to the inner wall surface of the sealed container 1 by welding, and includes a main bearing 13a that rotatably supports the main shaft of the crankshaft 6. The fixed scroll 12 is fastened and fixed to the frame 13 by bolts. A back pressure chamber 53 is formed between the orbiting scroll 11 and the frame 13.

  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.

  The release valve device 15 is for releasing pressure from the compression chamber 51 to the chamber inner space 54 so that the pressure in the compression chamber 51 does not become too high.

(Back pressure control mechanism)
FIG. 3 is a partially enlarged sectional view around the back pressure control mechanism 40 of FIG.
As shown in FIG. 3, the back pressure control mechanism 40 includes a back pressure valve communication passage 41 that communicates the compression chamber 51 and the back pressure chamber 53, and back pressure control that is disposed in the middle of the extension of the back pressure valve communication passage 41. The valve 45 is mainly provided. The back pressure control valve 45 corresponds to a “component of the back pressure control mechanism” in the claims.

  The back pressure valve communication passage 41 includes an outer circumferential relief groove 12d, a bay-shaped recess 12e, a back pressure valve inflow hole 42, and a back pressure valve outflow passage 44.

  The back pressure valve inflow hole 42 is a vertical hole extending upward from the fixed end plate 12 c of the fixed scroll 12, the lower opening 42 a communicates with the bay-shaped recess 12 e, and the upper communicates with the back pressure valve hole 43. Here, the opening 42 a of the back pressure valve inflow hole 42 is always covered with the orbiting end plate 11 b of the orbiting scroll 11 that revolves in the state where the orbiting scroll 11 is engaged with the fixed scroll 12. Do not open directly. The back pressure valve inflow hole 42 and the back pressure chamber 53 communicate with each other through an outer peripheral relief groove 12 d and a bay-shaped recess 12 e formed in the fixed end plate 12 c of the fixed scroll 12.

The back pressure control valve 45 includes a valve body 45a and a coiled spring 45b.
The valve body 45a is formed of a plate and is disposed so as to close the upper end opening of the back pressure valve inflow hole 42, that is, the opening on the opposite side of the opening 42a.

  The coiled spring 45b is an elastic spring and is disposed between the valve body 45a and a press-fitting member 20 described later. One end of the coiled spring 45 b is supported by the press-fitting member 20 to urge the valve body 45 a disposed on the other end toward the upper end opening of the back pressure valve inflow hole 42.

  According to such a back pressure control valve 45, when the pressure in the back pressure chamber 53 rises beyond a predetermined pressure difference from the pressure in the compression chamber 51, the valve body 45a is attached to the coiled spring 45b. It is lifted and opened against the power. The back pressure control valve 45 controls the pressure (back pressure) of the back pressure chamber 53 by communicating the back pressure chamber 53 and the compression chamber 51 by this valve opening operation.

The back pressure control valve 45 is attached to the fixed scroll 12 through the back pressure valve hole 43 formed in the fixed scroll 12 so as to face the extending portion of the back pressure valve communication passage 41. The back pressure valve hole 43 corresponds to an “attachment hole” in the claims.
The back pressure valve hole 43 after the back pressure control valve 45 is disposed at a predetermined position is closed by the press-fitting member 20 being press-fitted through the opening.

(Press-fit structure)
Next, the press-fitting structure of the press-fitting member 20 into the back pressure valve hole 43 will be described.
As shown in FIG. 3, the back pressure valve hole 43 in the present embodiment is such that the end plate of the fixed scroll 12 is perforated from the upper surface side so as to face the connection portion between the back pressure valve inflow hole 42 and the back pressure valve outflow passage 44. It is formed. The back pressure valve hole 43 is formed in a cylindrical space.
4 is a cross-sectional view of the press-fitting member 20 that is press-fitted so as to close the opening of the back-pressure valve hole 43 to which the back-pressure control valve 45 (see FIG. 3) as a component of the back-pressure control mechanism 40 (see FIG. 3) is attached. FIG. In FIG. 4, the fixed scroll 12 and the back pressure valve hole 43 formed in the fixed scroll 12 are indicated by phantom lines (two-dot chain lines).

As shown in FIG. 4, the press-fitting member 20 is formed so that the press-fitting part 21 and the reduced diameter part 22 are integrated in this order toward the press-fitting direction P into the back pressure valve hole 43. The press-fitting member 20 has a substantially cylindrical shape.
The press-fit portion 21 has an outer diameter larger than the inner diameter of the back pressure valve hole 43.
The reduced diameter portion 22 has an outer diameter smaller than the inner diameter of the back pressure valve hole 43.
Further, a tapered portion 23 is formed between the press-fit portion 21 and the reduced diameter portion 22 so that the outer diameter gradually decreases.

  A spring support portion 24 is formed on the distal end side of the press-fitting member 20 in the press-fitting direction P. The spring support portion 24 includes a substantially cylindrical spring insertion portion 24a having an outer diameter smaller than the inner diameter of the coil spring 45b (see FIG. 3), and a spring seat 24b.

One end of a coiled spring 45b (see FIG. 3) is inserted into the spring insertion portion 24a.
The spring seat 24b is formed at the base end portion of the spring support portion 24 on the reduced diameter portion 22 side, and supports one end side of the coiled spring 45b (see FIG. 3).

  The press-fitting part 21, the taper part 23, the reduced diameter part 22, and the spring insertion part 24a in the press-fitting member 20 are arranged so as to be coaxially arranged.

The press-fitting member 20 is formed with a countersink hole 25 in the press-fitting direction P with a countersink depth B longer than the length A of the press-fitting part 21 in the press-fitting direction P. The counterbore 25 corresponds to a “hole” in the claims.
The counterbore 25 has a cylindrical first space 25 a formed coaxially with the press-fit portion 21 and the reduced diameter portion 22.

Further, the counterbore hole 25 is configured to have a second space 25b that further bulges in the press-fitting direction P from the cylindrical first space 25a.
The second space 25b corresponds to a “bulging space” in the claims. Incidentally, the second space 25b in the present embodiment has a conical shape whose bottom surface is the end surface of the cylindrical first space 25a.

  The length B (columnar height B) in the press-fitting direction P in the first space 25a, that is, the countersink depth B is longer than the length A of the press-fitting part 21 in the press-fitting direction P as described above. It is set to be.

  The range of the ratio (C / D) of the inner diameter C of the counterbore 25 to the outer diameter D of the press-fit portion 21 is desirably 80% or more. The upper limit of the ratio (C / D) range is desirably less than 100%, but assuming that the first space 25a is provided up to the reduced diameter portion 22 that is reduced in diameter from the press-fit portion 21, 90 is assumed. Less than% is more desirable.

  In addition, the radial thickness of the reduced diameter portion 22 in which the first space 25 a is formed is desirably thinner than the radial thickness of the press-fit portion 21.

  As a material of such a press-fitting member 20, a material smaller than the Young's modulus of the material of the fixed scroll 12 is desirable. That is, it is desirable that the press-fitting member 20 be more easily elastically deformed than the fixed scroll 12. The fixed scroll 12 portion in which the back pressure valve hole 43 is formed corresponds to a “portion provided with an attachment hole” in the claims.

  The above-described scroll compressor S shown in FIG. 2 is manufactured by incorporating the electric motor 2 and the scroll compression mechanism 3 in the sealed container 1. At this time, the fixed scroll 12 constituting the scroll compression mechanism 3 is disposed after the back pressure valve hole 43 is formed in the fixed scroll 12 before the back pressure control mechanism 40 is provided. Is pressed into the back pressure valve hole 43, the sliding surface with the orbiting scroll 11 (the lower surface of the fixed scroll 12) is polished. Further, the sliding surface 12f (see FIG. 3) with the orbiting scroll 11 is further polished after the press-fitting member 20 is press-fitted into the back pressure valve hole 43.

Next, the refrigerant compression operation of the scroll compressor S will be described with reference mainly to FIG.
When the electric motor 2 is driven and the crankshaft 6 rotates, the pin portion 6c of the crankshaft 6 rotates eccentrically. The orbiting scroll 11 in which the pin portion 6 c is inserted into the orbiting bearing portion 11 c is orbitally driven while being restricted by the Oldham ring 14. By this series of operations, the refrigerant gas sucked from the suction pipe 7 (suction port 4) is compressed in the compression chamber 51 of the orbiting scroll 11 and the fixed scroll 12, and is discharged from the discharge port 5 into the chamber that is the discharge pressure space. It is discharged into the space 54. The refrigerant in the chamber inner space 54 circulates in the refrigeration cycle of the air conditioner 101 (see FIG. 1) from the discharge pipe 8 and is returned from the suction pipe 7 to the scroll compressor S again.

Next, the refueling operation of the scroll compressor S will be described with reference mainly to FIG.
The pressure in the back pressure chamber 53 is maintained at a back pressure that is an intermediate pressure between the discharge pressure and the suction pressure by the back pressure control valve 45. For this reason, a differential pressure is generated between the oil reservoir 9 and the back pressure chamber 53. With this differential pressure, the oil in the oil storage section 9 passes from the oil supply piece fixedly arranged at the lower end of the crankshaft 6 through the oil supply vertical hole 6a, through the oil supply horizontal hole 6b and the slit portion (not shown) provided in the crankshaft 6. Then, the lubricant flows into the back pressure chamber 53 while lubricating the swing bearing portion 11c and the main bearing 13a.

  The oil that has flowed into the back pressure chamber 53 flows into the compression chamber 51 through the back pressure valve communication passage 41 provided with the back pressure control valve 45 in the middle due to the differential pressure between the back pressure chamber 53 and the compression chamber 51. The oil that has flowed into the compression chamber 51 is discharged into the chamber inner space 54 from the discharge port 5 together with the refrigerant while improving the sealing performance of the compression chamber 51. The oil discharged from the discharge port 5 is separated from the refrigerant in the chamber inner space 54 and returns to the oil storage section 9 formed in the lower portion of the chamber inner space 54.

Next, the effect which the scroll compressor S which concerns on this embodiment show | plays is demonstrated.
As shown in FIG. 4, the press-fitting member 20 of the scroll compressor S has a press-fit portion 21 having an outer diameter larger than the inner diameter of the back pressure valve hole 43 (mounting hole) and a reduced diameter smaller than the inner diameter of the back pressure valve hole 43. The portion 22 is formed so as to be integrated in this order toward the press-fitting direction P.
Therefore, the press-fitting member 20 is sequentially inserted into the back-pressure valve hole 43 from the reduced diameter portion 22 with a small diameter to the press-fit portion 21 with a large diameter. Therefore, according to the scroll compressor S, the press-fitting process of the press-fitting member 20 into the back pressure valve hole 43 can be easily performed.

  Moreover, according to the scroll compressor S, since the press-fitting member 20 has the taper part 23 between the press-fit part 21 and the reduced diameter part 22, the press-fitting process can be performed more easily.

Moreover, in the conventional scroll compressor (for example, refer patent document 1), as above-mentioned, while a closure member is divided into two members, a back pressure pin and a fitting component, only a fitting component is press-fitted in a back pressure valve hole. On the other hand, in the scroll compressor S according to the present embodiment, the press-fitting member 20 is formed so that the press-fitting part 21, the reduced diameter part 22, and the spring support part 24 are integrated.
Therefore, according to the scroll compressor S, unlike the conventional scroll compressor (for example, refer patent document 1), the number of parts and assembly man-hours can be maintained small.

Moreover, in the conventional scroll compressor (for example, refer patent document 1), as above-mentioned, while a closure member is divided into two members, a back pressure pin and a fitting component, only a fitting component is press-fitted in a back pressure valve hole. Therefore, the back pressure pin in the back pressure valve hole is not sufficiently supported, and the operation of the back pressure control valve disposed adjacent to the back pressure pin may become unstable.
On the other hand, in the scroll compressor S according to the present embodiment, the press-fit portion 21, the reduced diameter portion 22, and the spring support portion 24 are integrated, so that the spring support portion 24 is provided with a coiled spring 45b (FIG. 3). The operational stability of the back pressure control valve 45 supported via the reference is further improved.

Further, the press-fitting member 20 of the scroll compressor S is formed with a countersink hole 25 (see FIG. 4) in the press-fitting direction P with a countersink depth B longer than the length A of the press-fitting part 21 in the press-fitting direction P. Yes.
Therefore, in this scroll compressor S, when the press-fitting member 20 is press-fitted into the back pressure valve hole 43, it becomes easy to displace toward the center of the counterbore hole 25. Thereby, in the scroll compressor S, when the press-fitting member 20 is press-fitted into the back pressure valve hole 43, occurrence of distortion in the fixed scroll 12 in which the back pressure valve hole 43 is formed can be suppressed.

  In the scroll compressor S, the radial thickness of the reduced diameter portion 22 is thinner than the radial thickness of the press-fit portion 21, so that the press-fit member 20 is press-fitted into the back pressure valve hole 43. It becomes easier to displace toward the center of the counterbore 25. Thus, the scroll compressor S can reliably suppress the occurrence of distortion in the fixed scroll 12 when the press-fitting member 20 is press-fitted into the back pressure valve hole 43.

  In the scroll compressor S, the ratio (C / D) of the inner diameter C of the countersink hole 25 to the outer diameter D of the press-fit portion 21 is set to be 80% or more and less than 100%, so that the press-fit member 20 Is more easily displaced toward the center of the counterbore hole 25 when being press-fitted into the back pressure valve hole 43. Thereby, the scroll compressor S can more reliably suppress the occurrence of distortion in the fixed scroll 12 when the press-fitting member 20 is press-fitted into the back pressure valve hole 43.

Further, in the scroll compressor S, the counterbore 25 is configured to have a second space (a bulging space) that further bulges from the columnar first space 25a in the press-fitting direction P. Is more easily displaced toward the center of the counterbore hole 25 when being press-fitted into the back pressure valve hole 43. Thereby, the scroll compressor S can more reliably suppress the occurrence of distortion in the fixed scroll 12 when the press-fitting member 20 is press-fitted into the back pressure valve hole 43.
In addition, by using a material having a smaller Young's modulus than the material of the fixed scroll 12 as the material of the press-fitting member 20, the occurrence of distortion in the fixed scroll 12 can be further reliably suppressed.

  According to the scroll compressor S and the air conditioner 101 including the scroll compressor S as described above, the compression distortion of the fixed scroll 12 is reduced, and the refrigerant compression efficiency is improved, so the coefficient of performance of the air conditioner ( COP) can be improved. Further, in the scroll compressor S, the sliding surface of the fixed scroll 12 in which the press-fitting member 20 is press-fitted into the back pressure valve hole 43 (mounting hole) is polished, so that the refrigerant compression efficiency is further improved. .

  Moreover, according to the above scroll compressor S and the air conditioner 101 provided with this, since a number of parts and an assembly man-hour can be maintained small, simplification of a manufacturing process can be achieved.

As mentioned above, although this embodiment was described, this invention is not limited to the said embodiment, It can implement with a various form.
FIG. 5 is a cross-sectional view of a press-fitting member according to a first modification of the press-fitting member of FIG. 6 is a cross-sectional view of a press-fitting member according to a second modification of the press-fitting member of FIG. FIG. 7 is a cross-sectional view of a press-fitting member according to a third modification of the press-fitting member of FIG. In the first to third modifications shown in FIGS. 5 to 7, the same components as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIG. 5, the press-fitting member 20 according to the first modified example has a countersink hole 25 formed only by a cylindrical first space 25 a and has the conical second space 25 b in the above embodiment. Not.
According to the scroll compressor S (see FIG. 2) having the press-fitting member 20 according to the first modification, the structure of the press-fitting member 20 can be simplified.

As shown in FIG. 6, the press-fit member 20 according to the second modification has an annular groove 26 that circulates along the inner peripheral surface of the reduced diameter portion 22. Specifically, it is formed on a conical slope that partitions the second space 25b.
According to the scroll compressor S having the press-fitting member 20 according to the second modified example (see FIG. 2), the press-fitting member 20 further moves toward the center of the counterbore hole 25 when being press-fitted into the back pressure valve hole 43. It becomes easy to displace. Thereby, the scroll compressor S can more reliably suppress the occurrence of distortion in the fixed scroll 12 when the press-fitting member 20 is press-fitted into the back pressure valve hole 43.

As shown in FIG. 7, the press-fitting member 20 according to the third modification has an annular groove portion 26 that circulates along the inner peripheral surface of the columnar first space 25 a in the reduced diameter portion 22.
According to the scroll compressor S having the press-fitting member 20 according to the third modification (see FIG. 2), when the press-fitting member 20 is press-fitted into the back pressure valve hole 43, the press-fitting portion 21 is particularly selected among the press-fitting members 20. It is easy to displace the countersink hole 25 to the center. Thereby, the scroll compressor S can more reliably suppress the occurrence of distortion in the fixed scroll 12 when the press-fitting member 20 is press-fitted into the back pressure valve hole 43.

  In the above embodiment, the hermetic electric compressor has been described by taking the scroll compressor S as an example. However, the hermetic electric compressor of the present invention can also be applied to a rotary compressor. And what press-fits the said press-fitting member 20 to the attachment hole formed in the proper place of the compression mechanism comprised including a cylinder, a roller, etc. is mentioned.

Next, the Example which verified the effect of the scroll compressor S of this invention is described.
Example 1
In Example 1, when the press-fitting member 20 was press-fitted into the back pressure valve hole 43 of the fixed scroll 12 illustrated in FIG. 4, the magnitude of distortion generated in the fixed scroll 12 was evaluated.

The inner diameter of the back pressure valve hole 43 is 8.985 mm, the outer diameter of the press-fit portion 21 (see FIG. 4) is 9.013 mm, and the outer diameter of the reduced diameter portion 22 (see FIG. 4) is 8.800 mm. Met.
The difference (B−A) between the counterbore depth B (see FIG. 4) and the length A (see FIG. 4) of the press-fit portion 21 was 1 mm.

The evaluation of the magnitude of the distortion is based on the flatness (μm) on the lower surface (sliding surface with the orbiting scroll 11) of the end plate (fixed end plate 12c) of the fixed scroll 12 after press-fitting the press-fitting member 20 into the back pressure valve hole 43. Measured and performed.
The flatness (μm) is a value obtained by measuring the roundness of the circumference (outer periphery) on the lower surface (the sliding surface with the orbiting scroll 11) of the end plate of the fixed scroll 12 using a table rotating roundness measuring machine. It is. The flatness in this example was 1.93 μm. The result is shown in FIG.

  FIG. 8 is a graph showing the magnitude of distortion generated in the fixed scroll 12 when the press-fitting member 20 is press-fitted into the back pressure valve hole 43 of the fixed scroll 12. 8, the horizontal axis represents the difference (B−A) between the countersink depth B of the press-fitting member 20 (see FIG. 4) and the length A of the press-fit portion 21 (see FIG. 4). “B-A (mm)” is written. The vertical axis represents the flatness (μm) on the lower surface of the end plate (fixed end plate 12c) of the fixed scroll 12, and is denoted as “end plate flatness (μm)” in FIG.

(Comparative Example 1)
Comparative Example 1 is the same as Example 1 except that the difference (B−A) between the counterbore depth B (see FIG. 4) and the length A (see FIG. 4) of the press-fit portion 21 is −1 mm. Thus, the press-fitting member 20 was press-fitted into the back pressure valve hole 43 of the fixed scroll 12, and the magnitude of the distortion generated in the fixed scroll 12 was evaluated.
The flatness in Comparative Example 1 was 2.35 μm. The result is shown in FIG.

(Comparative Example 2)
In Comparative Example 2, the same as in Example 1 except that the difference (B−A) between the counterbore depth B (see FIG. 4) and the length A (see FIG. 4) of the press-fit portion 21 is 0 mm. Then, the press-fitting member 20 was press-fitted into the back pressure valve hole 43 of the fixed scroll 12, and the magnitude of the distortion generated in the fixed scroll 12 was evaluated.
The flatness in Comparative Example 1 was 2.03 μm. The result is shown in FIG.

(Evaluate the magnitude of distortion)
As shown in FIG. 8, Comparative Example 1 in which the length A (see FIG. 4) of the press-fit portion 21 is longer than the countersink depth B (see FIG. 4) of the press-fit member 20, In Comparative Example 2 in which the length A of the press-fit portion 21 is equal, the end plate flatness (μm) exceeded 2.0 μm.

On the other hand, in Example 1, in which the countersink depth B was longer than the length A of the press-fit portion 21, the end plate surface flatness (μm) showed a low value of 1.93 μm.
That is, the scroll compressor S of the present invention having a longer countersink depth B than the length A of the press-fit portion 21 is compared with a scroll compressor in which the countersink depth B is equal to or greater than the length A of the press-fit portion 21. Thus, it was verified that the distortion generated in the fixed scroll 12 is small.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Electric motor 2a Stator 2b Rotor 3 Scroll compression mechanism 4 Suction port 5 Discharge port 6 Crankshaft 7 Suction pipe 8 Discharge pipe 9 Oil storage part 10 Lower bearing 11 Orbiting scroll 11a Orbiting scroll wrap 12 Fixed scroll (compression mechanism)
12a Fixed scroll wrap 12c Fixed end plate 13 Frame 13a Main bearing 14 Oldham ring 15 Release valve device 20 Press-fit member 21 Press-fit part 22 Reduced diameter part 23 Taper part 24 Spring support part 24a Insertion part 25 Countersink hole (hole)
25a 1st space 25b 2nd space 26 Groove part 40 Back pressure control mechanism 41 Back pressure valve communication path 42 Back pressure valve inflow hole 43 Back pressure valve hole (mounting hole)
44 Back pressure valve outflow passage 45 Back pressure control valve 45a Valve body 51 Compression chamber 53 Back pressure chamber 101 Air conditioner 102 Four-way valve 103 Heating / cooling throttle device 104 Indoor heat exchanger 105 Outdoor heat exchanger 106 Pipe C Cylinder bore diameter D Press-fit outer diameter P Press-fit direction S Scroll compressor (sealed electric compressor)

Claims (9)

A hermetic electric compressor that stores a compression mechanism that compresses sucked refrigerant and discharges it into a refrigeration cycle, and an electric motor that drives the compression mechanism in a hermetic container, and stores lubricating oil in the hermetic container. And
A mounting hole provided in the compression mechanism;
A press-fitting member press-fitted into the mounting hole;
With
The press-fit member is formed with a press-fit portion and a reduced diameter portion formed so that the outer diameter is reduced toward the press-fitting direction into the mounting hole,
The hermetic electric compressor, wherein the press-fitting member is longer than a length of the press-fitting part in the press-fitting direction and has a hole extending from the press-fitting part to the reduced diameter part.   The press-fit portion and the reduced-diameter portion have a cylindrical shape arranged coaxially, and the radial thickness of the reduced-diameter portion is thinner than the radial thickness of the press-fit portion. The hermetic electric compressor according to 1.   The hermetic electric compressor according to claim 2, wherein a tapered portion whose outer diameter is gradually reduced is formed between the press-fit portion and the reduced diameter portion.   The hole has a cylindrical space formed coaxially with the press-fitting portion and the reduced diameter portion, and a bulging space further bulging from the cylindrical space in the press-fitting direction. The hermetic electric compressor according to claim 1.   The hermetic electric compressor according to claim 4, wherein a groove portion that circulates along an inner peripheral surface of the hole in the reduced diameter portion is formed.   2. The hermetic electric compressor according to claim 1, wherein a Young's modulus of the press-fitting member is smaller than a Young's modulus of a portion where the mounting hole is provided.   The hermetic electric compressor according to claim 1, wherein the hermetic electric compressor is a scroll compressor.   The hermetic electric compressor according to claim 1, wherein the hermetic electric compressor is a rotary compressor.   The hermetic electric compressor according to any one of claims 1 to 8, a four-way valve, a cooling / heating throttle device, an indoor heat exchanger, and an outdoor heat exchanger are annularly formed with predetermined piping. An air conditioner comprising a refrigerant circuit that is connected and through which refrigerant flows.

Images