JPS58128491A - Plural cylinder rotary compressor - Google Patents

Abstract

PURPOSE:To permit manufacture of the captioned compressor even by means of a conventional machining technique by offsetting the assembly error by means of a joint part installed onto the crank shaft of a compression element, in a rotary compressor equipped with a plurality of compression chambers, namely a plural-cylinder rotary compressor. CONSTITUTION:Each compression element 3a, 3b is independently assembled with each cylinder 26a, 26b, upper bearing 28a, 28b, lower bearing 27a, 17b, roller 5a, 5b which eccentrically moves in each compression chamber 16a, 16b composed of these above mentioned three parts descrived the above, and each crank shaft 6a, 6b used for the eccentric movement of the roller 5a, 5b. The rotor which is fixed onto the motor shaft formed integrally with the crank shaft of the compression element which is closest to a motor among a plurality of independent compression element 3a and 3b is supported, by said compression element, and said compression element is fixed onto a chamber, and other compression element are heaped-up successively onto the before mentioned compression element, and the power transmission between the contiguous compression elements is performed with the joint installed onto the crank shafts of the both compression elements, and thus the error is offset.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a rotary compressor having multiple compression chambers,
That is, it relates to a multiple cylinder rotary compressor.

In a refrigeration cycle, if the capacity is large or if the cycle has multiple stages of compression or expansion, multiple compressors are required to compress the refrigerant.

However, it is rare that a plurality of compressors are actually used, and in most cases, a plurality of cylinder compressors each having a plurality of compression chambers are used. The reason for this is that compared to using multiple compressors, a multiple cylinder compressor (1) has a lower cost, and (2) the hem requires less space, so the product can be made more compact. (3
) This is due to the advantage that there is only one chamber for storing refrigerating machine oil, so there is no problem with the balance of refrigerating machine oil.

As described above, the highly valuable multi-cylinder compressor is currently limited to the reciprocating type (that is, the multi-cylinder reciprocating compressor), and the multi-cylinder rotary compressor has not yet appeared on the market.

If a multi-cylinder rotary compressor is developed, it will have the following advantages over the multi-cylinder reciprocating compressor. (1) Excellent compression performance (
2) The cost is lower because there are fewer parts, and (3) it is smaller. - However, the reason why a multi-cylinder rotary compressor with such advantages has not appeared on the market will be explained using FIGS. 1 to 3.

Fig. 1 is a sectional view of a multi-cylinder rotor, υ type compressor considered at the level of the prior art, and Fig. 2 is a sectional view.

FIG. 3 is a perspective view showing the details of the upper crank and lower crank in FIG. 1, and FIG. 3 is a cross-sectional view showing the joint provided in the upper crank and lower crank in FIG. 2 in a resting state.

In FIG. 1, 1 is a chamber, 2a is a chamber upper cover, and 2b is a chamber lower cover, and these three components form a high pressure chamber.

The cylinder 4 is fitted into the chamber 1, and the cylinder 4
The refrigerant is compressed by eccentric movement of the upper opening 25a and the lower roller 5b. Here, the upper and lower rollers 5a,
Since it would be difficult to assemble the crankshaft for eccentrically moving the crankshaft 5b if it were an integral structure, a structure as shown in FIG. 2 may be considered.

In other words, the crankshaft and motor shaft are 10°□.

Upper eccentric portion 7 for eccentrically moving the upper roller 5a. and an upper crank 6a integrally molded with a convex joint 9a, and a concave joint 9b that engages with the convex joint 9a.

Lower eccentric portion 8 for eccentrically moving the lower roller 5b. and a lower crank 6b which is integrally molded with the shaft 13.

A rotor 11 is fixed to a motor shaft 10 that is integrated with the upper crank 6a, and this rotor 11 is connected to the upper crank 6a.
Rotate a. Further, the motor shaft 10 is rotatably supported by an upper bearing 12 that forms a compression chamber together with the cylinder 4. The shaft 13 of the lower crank 6b is rotatably supported by a lower bearing 14 that forms a compression chamber together with the cylinder 4. 15 is a partition plate that partitions the compression chamber into an upper compression amount 16a and a lower compression amount 16b;
It also serves as a bearing for b. Further, 17 is a stator core fitted into the chamber 1, and 18 is a coil.

The flow of refrigerant in the multi-cylinder rotary compressor configured in this way is first guided into the compressor from the suction pipe 19, passes through the upper suction passage 20a and the lower suction passage 20b provided in the cylinder 4, and then flows through the upper and lower suction passages 20a and 20b, respectively. The compression amount 16a enters the lower compression chamber 16b, and after compression, from the upper compression chamber 16a passes through the upper discharge valve 21a to the outside of the compressor from the discharge pipe 2z, and from the lower compression amount 16b passes through the lower discharge valve 21b, It is once discharged into a discharge chamber 24 formed by the discharge cap 2.3 and the lower bearing 14, passes through a discharge passage 25 provided in the cylinder 4, and is discharged from the discharge pipe 22 to the outside of the compressor.

In the above explanation, the suction pipe 19. Although the description has been made of a multi-cylinder rotary compressor for one stage compression in which the discharge pipe 22 is common, a multi-cylinder rotary compressor for multi-stage compression in which suction pipes and discharge pipes are independent has the same basic structure.

However, a multi-cylinder rotary compressor, which can be considered at the level of the prior art, is difficult to realize with current manufacturing technology and, of course, has not appeared on the market. This is because in conventional single-cylinder rotary compressors, final manufacturing and assembly errors were absorbed when assembling the lower bearing, which has a structure that can move in a plane perpendicular to the axis of rotation. In the multi-cylinder rotary compressor shown in FIG. 1, the partition plate 15, which also serves as a bearing, needs to be assembled with the cylinder 4 on the order of microns. This is because it is not allowed.

It is also possible to design the partition plate 15 to have some slack to allow conventional manufacturing and assembly errors, but if the partition plate 15 has a large leakage between the upper compression amount 16a and the lower compression amount 16b, There is an abnormal noise when you hit it. Due to these drawbacks, it has not yet been put into practical use.

The object of the present invention is to provide a multi-cylinder rotary compressor that can be manufactured using conventional machining techniques.

A feature of the present invention is that a chamber includes one motor, at least a cylinder, a roller that rotates eccentrically within the cylinder, a crankshaft that rotates the roller eccentrically, a crankshaft that supports the crankshaft, and a cylinder that rotates eccentrically within the cylinder. A plurality of compression elements, each consisting of an upper bearing and a lower bearing constituting a compression chamber, are connected and housed in series, and the compression element closest to the motor is directly connected to the motor, and the compression element is fixed to the chamber. Located in cylinder rotary compressor.

More specifically, each compression element is assembled independently with a cylinder, an upper bearing, a lower bearing, a roller that moves eccentrically within the compression chamber made up of the above three parts, and a crankshaft that moves this roller eccentrically. Among the compressor elements that have been installed, the one closest to the motor supports the rotor that is fixed to the motor shaft that is integrated with the crankshaft of the compression element, and also fixes that compression element to the channel and supports other compression elements. The elements are loaded one after another into the compression element, and by transmitting power between adjacent compression elements using joints provided on the crankshafts of both compression elements, it is possible to eliminate assembly errors at the joints. It is possible, and current engineering technology is sufficient to make a multi-cylinder rotary compressor possible.

The present invention will be explained below with reference to Examples.

FIG. 4 is a sectional view of a multiple cylinder rotary compressor according to a first embodiment of the present invention.

In FIG. 4, the same parts as in FIG. 1 are denoted by the same numbers. The cylinder is the upper cylinder 26a.
and a lower cylinder 26b. The upper pressure line element 3a near the motor eccentrically rotates the upper cylinder 26a, the upper opening 25a that rotates eccentrically within the upper cylinder 26a, and the upper roller 5a. An upper crank 6a related to a crankshaft directly connected to the motor shaft of the motor (in this embodiment, the motor shaft and the upper crank 6a are integrated), supporting the upper crank 6a and an upper cylinder 26
It is composed of an upper cylinder circumferential upper bearing 28a and an upper cylinder downstream bearing 27a, which together with a constitute the upper compression amount 16a. On the other hand, the lower pressure line element 3b below the upper pressure line element 3a is connected to the lower cylinder '26b, this lower cylinder 26
The lower roller 5b rotates eccentrically within b, and the upper crank 6a
A lower crank 6b related to a crankshaft that rotates the lower roller 5b eccentrically (the means of power transmission will be described later) supports the lower crank 6b, and a lower cylinder 26b generates a lower compression amount 16b. It is composed of a lower cylinder circumferential bearing 28b and a lower cylinder lower bearing 27b.

Then, the motor, the upper pressure line element 3a, and the lower pressure line element 3b are connected and housed in the chamber 1 (the means of connection will be described later), and the upper cylinder 2 of the upper pressure line element 3a is housed.
6a is fixed to the chamber 1.

The upper pressure line element 3a and the lower pressure line element 3b are connected by fixing the lower cylinder peripheral bearing 28b to the upper cylinder downstream bearing 27H by a port 29'.

Further, the means for transmitting power from the upper pressure line element 3a to the lower pressure line element 3b is a convex joint 9a provided on the upper crank 6a, similar to the upper crank 6a and lower crank 6b according to FIG. This is done in combination with a concave joint 9b provided on the lower crank 6b.

The multi-cylinder rotary compressor 3 configured in this manner can be manufactured with conventional machining accuracy for the following reason.

That is, the upper cylinder 26a that constitutes the upper pressure line element 3a
,,The upper opening 25a, the upper crank 6a to which the motor rotor 11 is fixed, the upper cylinder upper bearing 28a, and the upper cylinder lower bearing 27H are manufactured and assembled using the conventional single cylinder There is no difference from a rotary compressor. Similarly, the lower cylinder 26b and the lower roller 5b constituting the lower pressure line element 3b
.

Lower crank 6b, lower cylinder upper bearing 28b.

The machining and assembly of the lower cylinder lower bearing 27b is performed independently of the above-mentioned upper pressure line element 3a, and the machining accuracy is naturally the same as before.

The upper cylinder lower bearing 27a of the upper pressure line element 3a assembled in this way and the lower cylinder circumferential upper bearing 28b of the lower pressure line element 3b are fastened and connected with bolts 29. At this time, as in the case of the upper crank, the joints 9a, 9b are used in combination to improve the machining accuracy of the upper and lower cranks 5a, (i
Make sure to escape at the joint part b. Each compression element 3a, 3
The machining accuracy of b is much higher than that of the joints 9a and 9b, so it is an extremely effective means to reduce the machining accuracy at the joints.

In this embodiment, the upper and lower cranks 5a, (5
An uneven joint 9a is provided at the joint part b.

9b is used, but the joint is not limited to a convex-concave joint, and a spline-type joint or the like may be used.

Furthermore, in this embodiment, the means for connecting the upper pressure line element 3a and the lower pressure line element 3b is to connect the upper cylinder lower bearing 27a with the lower cylinder circumferential upper bearing 28b using bolts.
9, but the lower cylinder 26b is fixed to the upper cylinder lower bearing 27a, the lower cylinder circumferential upper bearing 28b is fixed to the upper cylinder 26a, or the lower cylinder 26b is fixed to the upper cylinder 26a. may be fixed.

FIG. 5 is a sectional view of a multiple cylinder rotary compressor according to a second embodiment of the present invention, and FIG. 6 is an example of a refrigeration cycle incorporating the multiple cylinder rotary compressor according to FIG. This is a cycle configuration diagram showing the following.

In FIG. 5, the same parts as in FIG. 4 are denoted by the same numbers. In the embodiment according to FIG. 4,
Although only one suction pipe 19 is required, in this embodiment, each compression element is provided with an independent suction passage. That is, the upper compression amount 16a of the upper pressure line element 32a
An upper suction passage 30a that leads the refrigerant to the upper cylinder suction pipe 31a connected to this, and a lower suction passage 30b that leads the refrigerant to the lower compression amount 16b of the lower pressure line element 32b and the lower cylinder suction pipe 31b connected thereto. There will be something that will be established.

Multiple cylinder rotary compressor 32 configured in this way
In this case, the refrigerant sucked from the upper cylinder suction pipe 31a passes through the upper suction passage 30a and enters the upper compression amount 16a, and after being compressed, is discharged from the upper discharge valve 21a. Further, the refrigerant sucked from the lower cylinder suction pipe 31b passes through the lower suction passage 30b and enters the lower compression amount 16b, and after being compressed,
The refrigerant is once discharged from the lower discharge valve 21b to a discharge chamber 24 composed of a discharge cap 23 and a lower cylinder lower bearing 27b, passes through a discharge passage 25, and is discharged together with the refrigerant discharged from the upper discharge valve 21a. It is discharged from the pipe 22 to the outside of the compressor.

An example of a refrigeration cycle incorporating this multi-cylinder rotary compressor 32 will be explained using FIG. 6.

In FIG. 6, the same parts as in FIG. 5 are denoted by the same numbers. Set 4 is a condenser, 35a is an evaporator for the upper cylinder, 35b is an evaporator for the lower cylinder, 36a is a pressure reducer for the upper cylinder, and 36b is a pressure reducer for the lower cylinder.

To explain the flow of the refrigerant, the high-pressure gas refrigerant discharged from the discharge pipe 22 is condensed in the condenser 34 to become a liquid refrigerant. Next, it is separated into two systems, one of which is the pressure reducer 36 for the soil cylinder.
After being evaporated in the upper cylinder evaporator 35a, the upper cylinder suction pipe 31a
and goes to the upper pressure line element 32a of the multi-cylinder rotary compressor 32. The other side is depressurized by the lower cylinder pressure reducer 36b, evaporated by the lower cylinder evaporator 35b, and then passes through the lower cylinder suction pipe 31b to the lower pressure line element 32b.

The refrigeration cycle described above is capable of two-temperature evaporation, and has extremely high utility value in heat recovery cycles from different temperature levels, refrigerator-freezers, and the like.

FIG. 7 is a sectional view of a multiple cylinder rotary compressor according to a third embodiment of the present invention, and FIG. 8 is an example of a refrigeration cycle incorporating the multiple cylinder rotary compressor according to FIG. It is a cycle block diagram shown.

In FIG. 7, the same numbers as in FIG. 4 indicate the same parts.

The multiple cylinder rotary compressor 33 of this embodiment is provided with an upper suction passage 30a, a lower suction passage 33a, and a lower pressure line element 33b with low suction pressure, and an upper pressure line element 33a.
The upper suction passage 30a is provided with a communication passage 38 for guiding the discharge gas of the lower pressure line element 33b.

Multiple cylinder rotary compressor 33 configured in this way
At this time, the refrigerant sucked from the lower cylinder suction pipe 31b passes through the lower suction passage 30b, enters the lower compression amount 16b, and after being compressed, the refrigerant flows into the lower discharge valve 21b. Next, the upper suction path 30
The refrigerant sucked from the upper cylinder suction pipe 31a passes through the communication passage 38 that opens in the middle of the upper cylinder suction pipe 31a, passes through the upper suction passage 3oa, enters the upper compression amount 16a, and after being compressed, the upper discharge valve 21a is discharged from the discharge pipe 22 to the outside of the compressor.

An example of a refrigeration cycle incorporating this multi-cylinder rotary compressor 33 will be described using FIG. 8.

In FIG. 8, the same parts as in FIG. 7 are denoted by the same numbers. And 34 is a condenser.

37 is a first pressure reducer, 39 is an evaporator, 40 is a second pressure reducer,
41 is a gas-liquid separator.

To explain the flow of the refrigerant, the high-pressure gas refrigerant discharged from the discharge pipe 22 is condensed in the condenser 34 and becomes a liquid refrigerant.

Next, the first pressure reducer 37 reduces the pressure to an intermediate pressure, resulting in a two-phase state, and the gas-liquid separator 41 separates the refrigerant into gas refrigerant and liquid refrigerant. The gas refrigerant passes through the upper cylinder suction pipe 31a,
Directly led to the upper pressure line element 33a, the liquid refrigerant was further reduced in pressure in the second pressure reducer 40, evaporated in the evaporator 39, passed through the lower cylinder suction pipe 31b, and compressed in the lower pressure line element 33b. Thereafter, it passes through the communication path 38 and is guided to the upper pressure line element 33a.

The above-mentioned refrigeration cycle is conventionally called a multi-acting cycle and has been put into practical use with two independent compressors, but in this embodiment, one multi-cylinder rotary compressor 33 is used. And this can be achieved.

FIG. 9 is a sectional view of a multiple seven cylinder rotary compressor according to a fourth embodiment of the present invention, and FIG. 10 is a sectional view.

10 is a cycle configuration diagram showing an example of a refrigeration cycle incorporating the multiple cylinder/double rotary compressor according to FIG. 9. FIG.

In FIG. 9, the same parts as in FIG. 4 are denoted by the same numbers.

The multiple cylinder rotary compressor 44 of this embodiment has an upper pressure line element 44a and a lower compression element 44b provided with an upper suction passage 30a and a lower suction passage 30b, which are independent suction passages, respectively.
Upper compression amount 16a and lower compression chamber 16 related to each compression chamber
It is configured so that the gas discharged from b is independently discharged to the outside of the machine.

Multiple cylinder rotary compressor 44 configured in this way
At this time, the refrigerant sucked from the upper cylinder suction pipe 31a passes through the upper suction passage 30a.

It is guided to the upper compression amount 16a. After compression, the upper discharge valve 2
1a, and is discharged outside the compressor from the upper cylinder discharge pipe 43a.

The refrigerant sucked from the lower cylinder suction pipe 31b is
It passes through the lower suction passage 30b and is led to the lower compression amount 16b. After compression, a discharge chamber 2 consisting of a discharge cap 23 and a lower cylinder downstream bearing 27b is discharged from the lower discharge valve 21b.
4, and then passes through the lower cylinder discharge passage 42 and is discharged from the lower cylinder discharge pipe 43b to the outside of the compressor.

An example of a refrigeration cycle incorporating this multi-cylinder rotary compressor 44 will be described using FIG. 10.

In this FIG. 1θ, the same parts as in FIG. 9 are denoted by the same numbers. And 34 is the condenser% 37 is the first
A pressure reducer, 39 is an evaporator, 40 is a second pressure reducer, and 45 is an intermediate heat exchanger consisting of a low pressure side 46 and a high pressure side 47 thereof.

To explain the flow of refrigerant, the upper cylinder discharge pipe 43
The high-pressure gas refrigerant discharged from a is condensed in the condenser 34 and becomes liquid refrigerant. Next, the pressure is reduced to an intermediate pressure by the first pressure reducer 37, heat is absorbed by the low temperature side 46 of the intermediate heat exchanger 45, and the cycle of returning from the upper cylinder suction pipe 31a to the upper pressure line element 44a is repeated. The intermediate pressure gas refrigerant discharged from the lower cylinder discharge pipe 43b radiates heat on the high temperature side 47 of the intermediate heat exchanger 45 and becomes a liquid refrigerant. Next, the pressure is reduced to a low pressure in the second pressure reducer 40, evaporated in the evaporator 39, and the cycle of returning from the lower cylinder suction pipe 31b to the lower pressure line element 44b is repeated.

The above-mentioned refrigeration cycle was conventionally called a cascade cycle and was put into practical use with two independent compressors, but in this Example-7, one
This can be achieved with a multi-cylinder rotary compressor 44.

According to each of the embodiments described above, there are the following effects.

(1) A multi-cylinder rotary compressor can be manufactured using conventional machining techniques.

Therefore, in a refrigeration cycle that conventionally used a multi-cylinder reciprocating compressor, by using the multi-cylinder rotary compressor of the present invention in place of the compressor, nine parts whose compression performance is improved. Since there are fewer points, the cost is lower. It has the advantage of being small.

(2) Multiple cylinder rotary compressor 32 according to Fig. 5
By using this in the refrigeration cycle, two levels of evaporation temperature can be obtained.

(3) Multiple cylinder rotary compressor 33 according to Fig. 7
By using this in the refrigeration cycle, a single compressor can achieve a multi-cycle cycle.

(4) By using the multiple cylinder rotary compressor 44 according to FIG. 9 in a refrigeration cycle, a cascade cycle can be realized with one compressor.

Although each of the above embodiments has been described for the case where there are two compression elements, the present invention can be similarly applied to the case where there are three or more compression elements.

As described above in detail, according to the present invention, a chamber includes one motor, at least a cylinder, a roller that rotates eccentrically within the cylinder, a crankshaft that rotates the roller eccentrically, and a crankshaft that supports the crankshaft. At the same time,
A plurality of compression elements consisting of an upper bearing and a lower bearing, which together with the cylinder constitute a compression chamber, are connected in series and housed.

Since the compression element closest to the motor is directly connected to the motor and is fixed to the chamber, it is possible to provide a multi-cylinder rotary compressor that can be manufactured using conventional manufacturing techniques.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a multi-cylinder rotary compressor considered at the level of the prior art, and FIG. 2 is a sectional view. FIG. 3 is a perspective view showing the details of the upper crank and lower crank in FIG. 5 is a sectional view of a multiple cylinder rotary compressor according to a second embodiment of the present invention, and FIG. 6 is a sectional view of a multiple cylinder rotary compressor according to a second embodiment of the present invention. FIG. 7 is a cycle configuration diagram showing an example of a refrigeration cycle incorporating a multiple cylinder rotary compressor according to a third embodiment of the present invention; FIG. 9 is a cycle configuration diagram showing an example of a refrigeration cycle incorporating the multiple cylinder rotary compressor according to FIG. 7, and FIG. 9 is a cycle configuration diagram showing an example of a refrigeration cycle incorporating the multiple cylinder rotary compressor according to the fourth embodiment of the present invention. The sectional view, FIG. 10, is a cycle configuration diagram showing an example of a refrigeration cycle incorporating the multiple cylinder rotary compressor according to FIG. 9. 1... Chamber, 5a... Upper roller, 5b... Lower roller, 6a... Upper crank, 6b... Lower crank, 9a... Convex joint, 9b... Concave joint, 10...
・Motor shaft. 11...Rotor, 16a...Upper compression amount, 16b...
・Lower pressure power supply, 17... Stator core, 3, 32, 33
゜44...Multi-cylinder rotary compressor, 3a. 32 a, 33 a, 44 a--upper pressure line element, 3b
. 32b, 33b, 44b - lower pressure line element, 26a - upper cylinder, 26b - lower cylinder, 27a - upper cylinder downstream bearing, 27b - lower cylinder downstream bearing, 28a - upper cylinder circumference Upper bearing, 1st country 2nd figure early 4 country 3α -＼ 5th prisoner 6 country 2 7th figure early 8 country

Claims (1)

[Claims] 1. At least one motor within the chamber. A cylinder, a roller that rotates eccentrically within this cylinder, a crankshaft that rotates this roller eccentrically, a plurality of compression elements that support this crankshaft and consist of an upper bearing and a lower bearing that together with the cylinder constitute a compression chamber. Store them by connecting them in series. A multiple cylinder rotary compressor, characterized in that a compression element closest to the motor is directly connected to the motor and fixed to the chamber. 2. The connection between adjacent compression elements is fixed by fixing the upper bearing of the other compression element to the lower bearing of the compression element closer to the motor, and the power transmission between the two compression elements is controlled by the connection between the two compression elements. The multiple cylinder rotary compressor according to claim 1, wherein the compressor is operated by a joint provided on the crankshaft. 3. A multiple cylinder rotary compressor according to claim 1, wherein each compression element is provided with an independent suction passage. 4. Each compression element is provided with an independent suction passage, so that the gas discharged from each compression chamber of the compression element is independently discharged to the outside of the machine. multiple cylinder rotary compressor. 5. A communication path in which a compression element with a high suction pressure and a compression element with a low suction pressure are provided, each having a suction passage, and the discharge gas of the compression element with a low suction pressure is introduced into the suction passage of the compression element with a high suction pressure. A multi-cylinder rotary compressor according to claim 1, which is provided with: