JPH0481592A - rotary compressor - Google Patents

Abstract

PURPOSE:To make any deformation in a crankshaft reducible by connecting one inlet pipe to a compressive mechanical part from the opposite motor side of the compressive mechanical part. CONSTITUTION:A motor part composed of a stator 2 and a rotor 4 and a compressive mechanical part consisting of two sets of pump parts are installed in a hermetically sealed vessel 1, while torque of an electric motor is transmitted to the compressive mechanical part by a crankshaft 3, and a refrigerant gas is compressed alternately by these two-set pumps. Here, one inlet pipe 13 is pressed in a hole of an inlet gas passage 10a at the side of an auxiliary bearing 10 of the compressive mechanical part for connection's sake. Thus, since the inlet pipe 13 is not inserted into each side of cylinders 7, 9, these flat-formed cylinders 7, 9 are usable. With this constitution, a supporting span of the crankshaft 3 by both main and sub bearings 6, 10 becomes shortened, thus any possible deformation in the crankshaft 3 is restrainable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a rotary compressor having two sets of compression devices on the same rotating shaft, and particularly relates to, for example, an air conditioner.

Used in refrigerators and other freezers to reduce compressor vibration.

The present invention relates to a rotary compressor suitable for improving adiabatic efficiency.

[Prior art] A general two-cylinder rotary compressor is, for example,
Among the hermetic rotary compressors described in Japanese Patent No. 3-21383, one disclosed as a prior art is known. This conventional rotary compressor will be explained with reference to FIG.

FIG. 8 is a longitudinal sectional view of a conventional two-cylinder rotary compressor.

The vertical rotary compressor shown in FIG. 8 has an electric motor section housed in the L section and a compression mechanism section at the bottom in a closed container IA. The electric motor includes a stator 2 fixed to a closed container IA by shrink fitting or the like, and a rotor 4 fixed to a crankshaft 3. In the compression mechanism section located at the bottom, two sets of rotary compression devices (hereinafter referred to as pump sections) are installed on a pump holding plate 5 fixed to the closed container 1A by welding etc.)
Ru.

Among them, the first pump section is composed of a main bearing 6A that supports the crankshaft 3, a first cylinder 7A, and a partition plate 8A, and the second pump section is composed of the partition plate 8A, the second cylinder 9A, and the crankshaft. It is configured by an auxiliary bearing 10A that supports 3.

The crankshaft 3 has two eccentric parts 3a and 3b having a phase difference of 180' from each other, and rollers 1'4 associated with two rolling pistons fitted into these eccentric parts 3a and 3b.
a and 14b are the first cylinders 7A, respectively, as the crankshaft 3 rotates.

It rotates eccentrically within the second cylinder 9A.

The main bearing 6A, first cylinder 7A, partition plate 8A, second cylinder 9A, and sub-bearing 10A are fixed to the pump holding plate 5 with mounting bolts 11.

In such a two-cylinder rotary compressor, the discharge ports 12a, 12b and the suction lowers a, 9a provided in the two cylinders are installed at the same angle in the circumferential direction. Also,
Eccentric portion 3a of crankshaft 3.

3b are provided 180° apart from each other as described above, so that fluctuations in gas compression torque occurring in the two sets of pump sections are smoothed out and vibrations of the compressor are reduced.

1st. The suction lowers a and 9a of the second cylinders 7A and 9A are arranged at the same angle in a plane perpendicular to the axial direction of the crankshaft 3. Therefore, as shown in FIG. 8, a suction pipe 13A for supplying refrigerant is connected to the suction lower a of the first cylinder 7A by penetrating the closed container IA. Moreover, the suction port 9a and the suction lower a are communicated with the second cylinder 9A through the communication hole 8a of the partition plate 8.

A refrigerant gas suction passage is formed.

In addition, apart from the above-mentioned conventional technology, a technology in which suction pipes are connected to two cylinders from a direction perpendicular to the crankshaft is also known.

In addition, the horizontal two-cylinder rotary compressor is also the same as the vertical two-cylinder compressor.
It had a similar structure to a cylinder rotary compressor.

[Problems to be Solved by the Invention] As shown in FIG. 8, a conventional two-cylinder rotary compressor has a first pump unit that constitutes two sets of pump units. Second cylinder 7A
, 9A so that the inner walls of rollers 14a, 14b have appropriate clearance and the outer walls of rollers 14a, 14b are positioned, and then the main bearing 6A, first cylinder 7A, partition plate 8A, second cylinder 9A, A bearing 10A is fixed to the pump holding plate 5 with mounting bolts 11.

In this structure, compared to a 1-stroke + J rotary compressor, many parts are stacked in the direction of the rotation axis (crankshaft) and fastened with long mounting bolts 11, so that the parts perpendicular to the crankshaft 3 The position is likely to shift in this direction in response to the load.

However, in the above conventional technology, when connecting the suction pipe 13A to the first cylinder 7A, the first cylinder 7A and the suction pipe 13
In order to obtain sealing performance at the contact part with A, the suction pipe 13A
It is necessary to push the roller into the first cylinder 7A by press-fitting or the like, and there is a problem in that the clearance between the cylinder and the roller is shifted due to the load in the direction perpendicular to the crankshaft 3.

In particular, when connecting two separate suction pipes to two cylinders, the amount of misalignment between each part increases, and not only does the clearance between the cylinders and rollers not remain in the proper position, but the crankshaft There was also a risk that it would become unable to rotate.

On the other hand, when the refrigerant gas required for two cylinders is supplied from one suction pipe, it is necessary to use a suction pipe with a large diameter and increase the cross-sectional area of the refrigerant gas passage in order to minimize the suction loss of the refrigerant gas. There is. However, it has been difficult to make the diameter of the suction port provided in the cylinder sufficiently large due to restrictions on the thickness of the cylinder and problems with strength.

In addition, when connecting the suction pipe to the main bearing, partition plate, and sub-bearing from a direction perpendicular to the axial direction, there is a problem that the refrigerant gas suction passage is bent into a crank shape inside the sealed container, increasing suction loss. there were.

The present invention has been made to solve the problems of the prior art described above, and the suction pipe installation sometimes causes misalignment of each component in the compression mechanism in a direction perpendicular to the axis of rotation (crankshaft). It is an object of the present invention to provide a two-cylinder rotary compressor that prevents this and minimizes suction loss of refrigerant gas.

By the way, in a two-cylinder rotary compressor, the compression mechanism section becomes longer in the axial direction, so the support span of the crankshaft by the main bearing and the sub-bearing becomes longer, and the crankshaft is more likely to deform due to the compression pressure of the refrigerant gas. However, there was a problem in that bearings were prone to uneven contact and whirling vibration due to deflection.

Accordingly, another object of the present invention is to provide a two-cylinder rotary compressor that is highly reliable, compact, and reduces deformation of the crankshaft.

[Means for Solving the Problems] In order to achieve the above object, a rotary compressor according to the present invention includes, in a closed container, an electric motor section and a compression mechanism section consisting of two pump sections. In a rotary compressor that transmits the rotational force of an electric motor to a compression mechanism section through a crankshaft and compresses refrigerant gas alternately using two sets of pumps, one suction pipe is connected to the compression mechanism section from the side opposite to the electric motor of the compression mechanism section. It is connected to the section.

More specifically, in an airtight container, a motor part, a crankshaft having two eccentric parts that are directly connected to the motor and have a phase difference of 18 degrees from each other, and two eccentric parts fitted into the two eccentric parts. A rotary compressor comprising a rolling piston and two cylinders in which the two rolling pistons rotate eccentrically as the crankshaft rotates. From the electric motor side.

Main bearing, first cylinder, partition plate, second cylinder.

Each element of the sub-bearing is superimposed, one suction pipe is connected to the sub-bearing on the side opposite to the electric motor, and a refrigerant flow path communicating with this suction pipe is connected to the sub-bearing, the second cylinder, the partition plate, Each of the first cylinders is provided so as to form one linear refrigerant flow path.

The clearance between each roller and cylinder in the two sets of pump parts is adjusted to the appropriate position, and the main bearing, first cylinder, partition plate, second cylinder, and sub-bearing are fixed with mounting bolts, etc. After that, the suction pipe is connected from the sub-bearing side in the axial direction of the crankshaft by press-fitting or the like.

At this time, the load is applied in the direction in which the mounting bolts in the compression mechanism are tightened, so the many parts do not shift in the direction perpendicular to the crankshaft, and the clearance between the rollers and cylinders is maintained appropriately. Retained.

In addition, since the suction pipe is connected to the sub-bearing, the suction pipe is connected in advance to a part of the compression mechanism such as the sub-bearing or a soundproof cover fixed to the sub-bearing, and then the main bearing, the first cylinder, the partition Since the compressor can be assembled by fixing the pump parts such as the plate, the second cylinder, and the sub-bearing with mounting bolts or the like and inserting them into the closed container, no positional shift occurs within the compression mechanism.

Since the refrigerant gas supplied to each cylinder is sucked straight to the inlet of each cylinder, the suction loss of the refrigerant gas is reduced.

Furthermore, in the present invention, since the suction pipe is not inserted into the side of the cylinder, a flat-shaped cylinder can be used, so the crankshaft support span by the main bearing and the sub-bearing is shortened, which has been a problem in the past. Crankshaft deformation peculiar to two cylinders can be suppressed, and the heat receiving area of the refrigerant gas can be reduced, making it possible to achieve high efficiency.

[Embodiments] Each embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

FIG. 1 is a longitudinal sectional view of a two-cylinder horizontal rotary compressor according to an embodiment of the present invention, and FIGS. 2 and 3 are views.

4 and 5 are perspective views of the first cylinder, partition plate, second cylinder, and sub-bearing, which are the parts shown in FIG. 1, respectively.

First, FIG. 1 shows the configuration of a two-cylinder horizontal rotary compressor in this embodiment. In FIG. 1, the same reference numerals as in FIG. 8 indicate parts equivalent to the prior art.

The horizontal rotary compressor shown in FIG.
A compression mechanism section consisting of a set of pump sections is housed.

The electric motor section includes a stator 2 fixed to a closed container 1 by shrink fitting or the like, and a rotor 4 to which a crankshaft 3 is fitted.

The compression mechanism section has two sets of rotary compression devices i (pump sections), and the first pump section has a main bearing 6. The second pump section is composed of the first cylinder 7 and the partition plate 8. Second cylinder9.
It is constituted by an auxiliary bearing 10 that supports the crankshaft 3. The main bearing 6 is fixed to the closed container 1 by welding or the like.

The crankshaft 3 has two eccentric parts 3a and 3b having a phase difference of 18 degrees from each other, and a roller 14 associated with two rolling pistons fitted into these eccentric parts 3a and 3b.
a and 14b are adapted to eccentrically rotate within the first cylinder 7 degrees and the second cylinder 9, respectively, as the crankshaft 3 rotates. Following the rotation of these rollers 14a and 14b, vanes (not shown) reciprocate within each cylinder 7.9, thereby alternately compressing the refrigerant gas.

Here, the first cylinder 7 which is a component used in the compression mechanism section
, partition plate 8. Second cylinder9. 2, 3, 4, and 5, respectively, and the configuration and assembly method of the compression mechanism section will be described in detail.

In the first cylinder 7 shown in FIG. 2, 7a is a notch for the refrigerant gas passage related to the refrigerant flow path, 7b is the two mounting holes,
7v indicates a groove in which a vane (not shown) is mounted and reciprocated. Note that although no reference numeral is attached, there is a partition plate 8. Second
Cylinder 9. A hole for fastening to the main bearing 6 together with the sub-bearing 10 and the like is also drilled.

In the partition plate 8 shown in FIG. 3, 8a is a communication hole related to the refrigerant flow path, and although no symbol is attached, the first cylinder 7,
Second cylinder9. A hole for fastening to the main bearing 6 together with the sub-bearing 10 and the like is also drilled.

In the second cylinder 9 shown in FIG. 4, 9a is a notch for the refrigerant gas passage related to the refrigerant flow path, 9C is a hole for two installations, and 9v is a vane (not shown) installed for reciprocating movement. Showing grooves. Note that although no code is attached, the first cylinder 7
, partition plate 8. A hole for fastening to the main bearing 6 together with the sub-bearing 10 and the like is also drilled.

In the sub-bearing 10 shown in FIG. 5, 10a represents a refrigerant gas flow path related to a refrigerant flow path, and 10d represents four mounting holes.

When assembling the compression mechanism, first insert the crankshaft 3 into the main bearing 6 shown in FIG. 1 with the roller 14a fitted into the eccentric part 3a, and then insert the crankshaft 3 into the main bearing 6 shown in FIG. After adjusting the clearance between the first cylinder 7 and the outer wall of the roller 14a to be appropriate, the two first cylinders 7 are bolted to the main bearing 6 using the holes 7b.

Next, partition plate 8. The second cylinders 9 are stacked one on top of the other, and the roller 14 is fitted into the second eccentric portion 3b of the crankshaft 3.
After properly adjusting the clearance between the outer wall of the second cylinder 9 and the inner wall of the second cylinder 9, the two second cylinders 9 are attached to the main bearing 6.b with bolts using the holes 9c. The first cylinder 7, the partition plate 8° and the second cylinder 9 are fastened and fixed.

Thereafter, after overlapping the secondary bearing 10 and the secondary bearing cover 15, the four pieces are attached via the holes 10d to the entire compression mechanism, that is, the secondary bearing cover 15° and the secondary bearing 10. Second cylinder9. Partition plate 8. The first cylinder 7 and the main bearing 6 are fastened and fixed in the direction of the crankshaft.

The suction pipe 13 is press-fitted into the hole of the suction gas flow path 10a on the sub-bearing 10 side of the compression mechanism fixed in this way, and is assembled into the closed container 1, and the stator 2 is fixed to the closed container 1 by shrink fitting or the like. The main bearing 6 and the closed container 1 are fixed by welding or the like.

When the compression mechanism is assembled using the method described above, the suction pipe 1
3 into the secondary bearing 10 is applied in the direction of bolt tightening, so all the parts in the compression mechanism do not shift in the direction perpendicular to the fine details of the crankshaft, ensuring sufficient assembly accuracy. be done.

More preferably, the suction pipe 13 is connected to the secondary bearing 10 in advance before assembling the compression mechanism section. By connecting it to a part of the pump section, such as the sub-bearing cover 15, the positional accuracy of each component after the compression mechanism section is assembled becomes higher.

Note that the compression mechanism section may be assembled in a manner other than that described above. That is, even if the first cylinder 7 and the main bearing 6 are fixed after positioning, the second cylinder 9 and the sub-bearing 10 are fixed independently after positioning, and then the open parts are fitted together. The above effects are fully guaranteed.

Now, when refrigerant gas is supplied into each cylinder with the configuration of this embodiment, the cross-sectional area of the refrigerant gas passage can be made sufficiently large. That is, after the refrigerant gas passes through the suction pipe 13, it passes through the suction pipe 13 as shown in FIGS.

It flows as shown by the arrows in FIGS. 3 and 2 and is supplied to each cylinder. Therefore, by setting the suction gas passage 10a of the secondary bearing 1° and the notch 7a of the second cylinder 9 large and press-fitting the large diameter suction pipe 13, the cross-sectional area of the refrigerant gas passage can be made large enough for two cylinders. Nari, 1
Suction losses can be minimized in the book passage. This is because the diameter of the suction passage is not restricted by the lateral length of each component of the pump section.

Also, the suction gas passage 10a of the sub-bearing 10.

Notch 9a of second cylinder 9, communication hole 8a of partition plate 8,
It is preferable that the notch 7a of the first cylinder 7 is arranged in line with the suction pipe 13, that is, parallel to the axis of the crankshaft 3, so that the refrigerant gas can flow into the first cylinder 7. It is supplied linearly to each second cylinder 7.9, and the effect of reducing suction loss is increased.

Furthermore, in the structure of this embodiment, the suction pipe is not inserted from the side of the cylinder (in the direction perpendicular to the crankshaft center).
A flat cylinder can be used. Therefore, the support span of the crankshaft by the main bearing 6 and the sub-bearing 10 is shortened, and it is possible to suppress deformation of the crankshaft 3, which has conventionally been a problem especially in two-cylinder engines.

As described above, this embodiment has the following effects.

1) Since the suction pipe can be installed without causing misalignment of each part of the 2-cylinder rotary compressor pump part, which has many parts overlapped and fixed, the assembly accuracy of the 2-cylinder rotary compressor is guaranteed. .

2) Without being limited by the axial thickness of the cylinder,
Since a suction pipe with a large diameter sufficient to supply each cylinder can be connected from the axial direction, the cross-sectional area of the refrigerant gas passage can be increased, reducing suction loss of refrigerant gas and increasing efficiency. .

3) Since a flat cylinder can be used, crankshaft deformation peculiar to two cylinders can be suppressed.

4) Vibrations caused by whirling of the crankshaft can be reduced, and the overall length of the compressor can be reduced to make it more compact.

Next, FIG. 6 is a longitudinal cross-sectional view of a compression mechanism section of a two-cylinder horizontal rotary compressor according to another embodiment of the present invention, and FIG. FIG. 2 is a longitudinal sectional view of a cylinder vertical rotary compressor. In each figure, the same reference numerals as in FIG. 1 indicate equivalent parts, and the explanation thereof will be omitted.

In the embodiment shown in FIG. 6, an adiabatic suction pipe 16 is connected to the pump section in place of the suction pipe 13 in the previous embodiment shown in FIG.

The insulating suction pipe 16 is inserted along the refrigerant flow path from the sub-bearing 10 side to the main bearing-side cylinder, and is inserted along the refrigerant flow path from the sub-bearing 10 side to the main bearing-side cylinder. Second
An opening is formed in the tube wall of the adiabatic suction tip corresponding to the cylinder 7.9.

As shown in FIG. 6, the tip of the heat insulating suction pipe 16 is inserted and fixed until it passes through the second cylinder 9 and the partition plate 8 and reaches the inside of the first cylinder 7.

A good way to fix it is to press-fit the insulating suction pipe 16 into the suction inlet 1Oe of the sub-bearing 10. In this case, the refrigerant gas is sealed between the inlet 10e of the sub-bearing 10 and the outer wall of the insulating suction pipe 16. will be done. The openings provided in the wall of the tube are located in the first cylinder 7 and the second cylinder 9,
The refrigerant gas flows through each cylinder 7.9 along the path shown by the arrow in Fig. 6.
supplied within. Therefore, the wall of the adiabatic suction pipe 16 inserted into the cylinder suppresses the temperature of the suction refrigerant gas from rising due to the cylinder being heated to a high temperature, thereby increasing the adiabatic efficiency.

Note that the outer wall of the heat insulating suction pipe 16, the first cylinder 7, and the partition plate 8. It is preferable to provide a gap between the second cylinder 9 and the like, thereby further enhancing the above-mentioned effects.

This is because the thermal conductivity of the voids is lower than that of the solid.

In this way, according to the embodiment shown in FIG. 6, in addition to achieving the same effects as in the previous embodiment, the adiabatic suction pipe also serves as a heat insulator to suppress overheating of the refrigerant gas supplied in each cylinder. As a result, there is an effect unique to this embodiment that the adiabatic efficiency of the compressor is improved.

In addition, although each of the above-mentioned embodiments has been described with respect to a two-cylinder horizontal rotary compressor, the present invention is not limited to a horizontal rotary compressor.
Needless to say, the present invention can be similarly applied to a two-cylinder vertical rotary compressor as shown in FIG.

Further, in the above-described embodiment, a method was described in which the main bearing 6 was welded to the closed container 1 as a means for fixing the compression mechanism section in the closed container 1, but the present invention is not limited to this, and the first cylinder 7, Partition plate 8. Second cylinder9. Even if any part of the secondary bearing 10 is fixed to a closed container, the effects of the present invention are guaranteed.

[Effects of the Invention] As explained in detail above, according to the present invention, when installing the suction pipe, each component in the compression mechanism is sometimes connected to the rotating shaft (crankshaft).
It is possible to provide a two-cylinder rotary compressor that prevents misalignment in the direction perpendicular to the axis of the rotary compressor and minimizes suction loss of refrigerant gas.

Furthermore, it is possible to provide a highly reliable and compact two-cylinder rotary compressor with reduced deformation of the crankshaft.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a two-cylinder horizontal rotary compressor according to an embodiment of the present invention, and FIGS. 2 and 3 are views. 4 and 5 are perspective views of the first cylinder, partition plate, second cylinder, and secondary bearing, which are the parts shown in FIG. 1, respectively, and FIG. 6 is a perspective view of another embodiment of the present invention. FIG. 7 is a vertical cross-sectional view of a compression mechanism section of a two-cylinder horizontal rotary compressor, and FIG. 8 is a vertical cross-sectional view of a two-cylinder vertical rotary compressor according to yet another embodiment of the present invention. FIG. 2 is a longitudinal sectional view of a conventional two-cylinder rotary compressor. DESCRIPTION OF SYMBOLS 1... Airtight container, 2... Stator, 3... Crankshaft, 3a, 3b... Eccentric part, 4... Rotor, 6...
・Main bearing. 7... First cylinder, 7a... Notch, 8... Partition plate, 8a... Communication hole, 9... Second cylinder, 9a
... Notch, 10 ... Sub bearing, 10a ... Suction gas passage, 13 ... Suction pipe, 14a, 14b ... Roller, 16 ... Heat insulation suction pipe. Fig. 1...-... Sealed container 2-...
・・・・・・・・・Stator 3・・・・・・・・・・・・・・・・・・Crankshaft 4・・・・・・・・・・・・・・・・・・・Rotor 6-
・・・・・・・・・・・・・・・Main bearing 7・・・・・・・
・・・－・・・・・・17th S/Da 8・・・・・・・・・
・・・Partition plate 9・ ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・Suction pipe 14a, 14b-o-ra Diagram insulation Suction pipe 0a Suction waste passage

Claims (1)

[Claims] 1. An electric motor section and a compression mechanism section consisting of two sets of pump sections are provided in a closed container, the rotational force of the electric motor is transmitted to the compression mechanism section by a crankshaft, and the two sets of pumps are A rotary compressor that compresses refrigerant gas alternately in a rotary compressor, characterized in that one suction pipe is connected to the compression mechanism from the side opposite to the electric motor of the compression mechanism. 2. In a sealed container, an electric motor part, a crankshaft having two eccentric parts that are directly connected to the electric motor and have a phase difference of 180 degrees from each other, and two rolling pistons fitted into the two eccentric parts. , a compression mechanism section comprising two cylinders in which two rolling pistons rotate eccentrically as the crankshaft rotates, wherein the compression mechanism section includes, from the electric motor side, The main bearing, first cylinder, partition plate, second cylinder, and sub-bearing are stacked one on top of the other, and one suction pipe is connected to the sub-bearing on the side opposite to the motor, and the refrigerant is communicated with this suction pipe. A rotary compressor characterized in that a flow path is provided in each of the sub bearing, the second cylinder, the partition plate, and the first cylinder so as to form one linear refrigerant flow path. 3. The suction pipe is connected to the compression mechanism section parallel to the crankshaft, and a refrigerant flow path passing through the sub-bearing, the second cylinder, the partition plate, and the first cylinder in the compression mechanism section is formed parallel to the crankshaft. The rotary compressor according to claim 1 or 2, characterized in that: 4. The suction pipe is an insulated suction pipe that is inserted along the refrigerant flow path from the auxiliary bearing side to the inside of the main bearing side cylinder, and the refrigerant gas is injected into the walls of the insulated suction pipes corresponding to the first and second cylinders. 4. The rotary compressor according to claim 1, further comprising an opening for supplying air to the rotary compressor.