JPS63272988A - Two stage compression type compressor - Google Patents

Abstract

PURPOSE:To reduce pressure loss in the low stage side by forming the inner diameter dimension of low stage side compression chamber larger than that of high stage side compression chamber while disposing a low stage side second discharge valve chamber on a specified position in an intermediate partition plate. CONSTITUTION:The respective low and high stage side compression mechanism 21, 22 are disposed above and below, and an intermediate partition plate 23 is disposed therebetween. And between the intermediate partition plate 23 and a main bearing 24 is disposed a low stage side cylinder 25 to form a low stage side compression chamber 26. On the other hand, a high stage side cylinder 28 is disposed between said plate 23 and a sub-bearing 27 to form a high stage side compression chamber 29. Thus, the inner diameter dimension D1 of low stage side compression chamber 26 is set larger than that D2 of high stage one 29. Also, said plate 23 is formed on a position corresponding to the outside of said chamber 29 with a second discharge valve chamber 32' in the low stage side, and a second discharge valve 32 is disposed in the inside of said chamber 32'.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a two-stage compression type compressor with an improved structure of a rotary compression mechanism section stacked in two stages.

(Prior Art) Generally, a two-stage compression type compressor has been developed as a compressor for an air conditioner, for example, which includes a pair of rotary pressure aIi1 structures stacked in two stages, upper and lower.

Figure 4 shows the configuration of the main parts of this type of two-stage compression type compressor, where 1 is the lower stage compression mechanism located on the upper side, and 2 is the higher stage compression mechanism located on the lower side. This is the mechanical part. In this case, an intermediate partition plate 3 is disposed between the low-stage compression #Mj 14 section 1 and the high-stage compression mechanism section 2. And main bearing 4
The cylinder 5 of the low-stage compression mechanism section 1 is disposed between the intermediate partition plate 3 and the compression v! of the low-stage compression II groove section 1. 6
is formed, and the cylinder 8 of the high-stage compression mechanism section 2 is arranged between the sub-bearing 7 and the intermediate partition plate 3 to form the compression chamber 9 of the high-stage compression mechanism section 2. .

Further, a gas suction hole 10 is formed in the peripheral wall surface of the cylinder 5 of the low-stage compression mechanism section 1, and a discharge valve chamber 11 of the low-stage compression mechanism section 1 is formed in the main bearing 4. , the discharge valve 1 of the low-stage compression n structure 1 is disposed in the discharge valve chamber 11.
2 are arranged.

Furthermore, a gas suction hole 13 is formed in the peripheral wall surface of the cylinder 8 of the high-stage compression mechanism section 2, and a sub-bearing 7
A discharge valve chamber 14 of the high-stage compression mechanism section 2 is formed in the discharge valve chamber 14, and a discharge valve 15 of the high-stage compression mechanism section 2 is disposed within the discharge valve chamber 14.

During operation of the compressor body, low-pressure gas such as refrigerant gas sucked into the compression chamber 6 of the low-stage compression mechanism section 1 through the gas suction hole 10 as shown by the arrow in FIG. After being compressed by the side compression mechanism 1, the gas is discharged from the low stage compression mechanism section 1 via the discharge valve 12 of the low stage compression mechanism section 1, and this discharged gas is then discharged from the high stage compression mechanism section 2. The gas is introduced into the compression chamber 9 of the high-stage compression mechanism section 2 through the gas suction hole 13, and this high-stage side pressure 1IIti
The compressed gas further compressed to a high pressure state by the structure 2 is discharged from the high stage compression mechanism section 2 via the discharge valve 15 of the high stage compression mechanism section 2.

By the way, in this type of device, the lower stage side compression mechanism section 1
The displacement volume of the compression chamber 6 is set to be larger than the displacement volume of the compression chamber 9 of the high-stage compression F11 structure 2. In this case, in the conventional configuration, the inner diameter dimension Ds of the compression chamber 6 of the lower stage compression mechanism section 1 and the inner diameter dimension D2 of the compression chamber 9 of the higher stage compression mechanism section 2 are formed to have approximately the same dimension. ing. Then, the height dimension H2 of the compression chamber 9 of the high stage compression mechanism section 2 is set lower than the height dimension H1 of the compression chamber 6 of the low stage compression mechanism section 1, or the height dimension H2 of the compression chamber 9 of the low stage compression mechanism section 1 is set lower. Is the high stage side pressure I compared to the eccentricity of the roller in the compression chamber 6 of No. 1? i!
By setting the eccentricity of the roller of the compression chamber 9 of the mechanism section 2 to be small, the displaced volume of the compression chamber 6 of the low stage side compression mechanism section 1 is made smaller than the displaced volume of the compression chamber 9 of the high stage side compression mechanism section 2. It was set to be large.

However, in the conventional configuration described above, only a single discharge valve 12.15 was provided in each of the low-stage compression mechanism section 1 and the high-stage compression 8N structure section 2; Since the pressure inside the mechanism section 1 is low, there is a problem that the specific volume is large and the pressure loss is large.

Therefore, either the discharge valve 12 of the low-stage compression mechanism section 1 is made larger, or the discharge valve 12 is added to the low-stage compression mechanism section 1 together with the discharge valve 12.
The second discharge valve 16 shown in FIG. 5 or the second discharge valve 16 shown in FIG.
It is considered that the pressure loss can be reduced by providing a discharge valve 17.

However, as shown in FIG.
A second discharge valve chamber 18 of the low stage compression mechanism part 1 is formed on the peripheral wall surface of the cylinder 5, and a second discharge valve 16 of the low stage compression mechanism part 1 is formed in the discharge valve chamber 18. If such a structure is adopted, there is a problem in that it is difficult to process the low-stage compression mechanism section 1, and there is also a problem in that the performance is poor because the top clearance volume is large. Further, as shown in FIG. 5, a second discharge valve chamber 19 of the low stage compression mechanism section 1 is formed in the partition plate 3 that partitions the low stage compression mechanism section 1 and the high stage side pressure I1 mechanism section 2. However, in the case where the second discharge valve 17 of the low-stage compression mechanism section 1 is arranged in the discharge valve chamber 19, the second discharge valve chamber 19 of the partition plate 3 and the high-stage compressor lI4
Since it is necessary to arrange the auxiliary partition plate 20 for sealing between the partition plate 2 and the part 2, there is a problem that the thickness of the partition plate 3 becomes thick.

(Problems to be Solved by the Invention) When only a single discharge valve 12 is provided in the low-stage compression mechanism section 1, the pressure inside the low-stage compression mechanism section 1 is low, so the specific volume is large. (There was a problem of large pressure loss. Also,
The second discharge valve chamber 18 of the low-stage compression mechanism section 1 is formed on the peripheral wall surface of the cylinder 5 of the low-stage compression mechanism section 1, and the second discharge valve chamber 18 of the low-stage compression mechanism section 1 is formed within this discharge valve chamber 18. If the configuration is such that the discharge valve 16 is disposed, there is a problem that it is difficult to process the low stage side pressure section iiw part 1, and since the top clearance volume is large, there is also a problem that the performance is poor. The second discharge valve chamber 1 of the low stage side pressure lI mechanism part 1 is inserted into the partition plate 3 that partitions between the low stage side pressure lI mechanism part 1 and the high stage side compression mechanism part 2.
9, and a low-stage compression mechanism section 1 is formed in this discharge valve chamber 19.
When the second discharge valve 17 is arranged, an auxiliary partition plate 20 for sealing is arranged between the second discharge valve chamber 19 of the partition plate 3 and the high-stage compressor 4F1 section 2. Therefore, there is a problem in that the thickness of the partition plate 3 becomes thick.

This invention can improve performance by reducing pressure loss in the low-stage compression mechanism part, and there is no risk that machining of the low-stage compression mechanism part will become particularly difficult. Two-stage compression expansion pressure 1i that eliminates the risk of increasing the thickness of the partition plate between the high-stage compression mechanism and the high-stage compression mechanism! The purpose is to provide opportunities.

[Structure of the Invention] (Means for Solving the Problems) The present invention is characterized in that the inner diameter of the compression chamber of the lower stage rotary compression mechanism is larger than the inner diameter of the compression chamber of the higher stage rotary compression mechanism. A low-stage compression mechanism is formed at a position corresponding to the outer part of the pressure 11 of the high-stage compression mechanism in the partition plate that partitions between the low-stage compression mechanism and the high-stage compression mechanism. A second discharge valve chamber of section 1 is provided.

(Function) By providing the second discharge valve chamber of the low stage compression mechanism section in the partition plate that partitions the low stage compression mechanism section and the high stage compression mechanism section a, the inside of the low stage compressor 11 is In addition to improving performance by reducing pressure loss in By reliably sealing the discharge valve chamber on the partition plate side of the compressor, there is no need for an auxiliary partition plate between the partition plate side discharge valve chamber of the low stage compression mechanism section and the high stage compression mechanism section. It is.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Figure 1 shows the schematic configuration of the main parts of a rotary two-stage compression compressor, in which 21 is a low-stage compression mechanism located on the upper side, and 22 is a high-stage compression mechanism located on the lower side. This is the side compression mechanism section.

In this case, the low stage side compression mechanism section 21 and the high stage side pressure 1i! An intermediate partition plate 23 is provided between the mechanism section 22 and the mechanism section 22 .

A cylinder 25 of the low-stage compression mechanism section 21 is disposed between the main bearing 24 and the intermediate partition plate 23, and these main bearings 24. Intermediate partition plate 23 and cylinder 2
A compression chamber 26 of the low-stage compression mechanism section 21 is formed between the two. Further, the cylinder 28 of the high-stage compression mechanism section 22 is disposed between the sub-bearing 27 and the intermediate partition plate 23, and these sub-bearings 27. A compression chamber 29 of the high-stage compression mechanism section 22 is formed between the intermediate partition plate 23 and the cylinder 28 . In this case, the height dimension H1 of the compression chamber 26 of the low-stage compression mechanism section 21 and the compression π2 of the high-stage compression mechanism section 22 are determined.
9 is formed to have approximately the same height dimension H2, and the inner diameter dimension D1 of the compression chamber 26 of the low-stage compression mechanism section 21.
is the inner diameter dimension D2 of the compression chamber 29 of the high stage side pressure miIM section 22
It is formed with a larger diameter.

Furthermore, a gas suction hole 30 is formed in the peripheral wall surface of the cylinder 25 of the low-stage compression mechanism section 21 .

Further, the low-stage compression mechanism section 21 is provided with a first discharge valve 31g3 disposed on the main bearing 24 and a second discharge valve 32 disposed on the intermediate partition plate 23, respectively. In this case, the intermediate partition plate 23 includes the high-stage compression mechanism section 2.
A second discharge valve chamber 33 of the low-stage compression mechanism section 21 is formed at a position corresponding to the outer side of the second compression chamber 29. A second discharge valve 32 of section 21 is provided. Further, a discharge valve chamber 34 of W41 of the low stage compression mechanism section 21 is formed in the main bearing 24 at a position vertically spaced apart and opposite to the second discharge valve chamber 33 of the intermediate partition plate 23. 1 discharge valve chamber 34
A first discharge valve 31 of the low-stage compression mechanism section 21 is disposed inside.

On the other hand, the cylinder 28 of the high-stage compression mechanism section 22 also has a gas suction hole 35 formed in its peripheral wall surface, as shown in FIG. Roughly speaking, a discharge valve chamber 36 of the high-stage compression mechanism section 22 is formed in the secondary bearing 27, and a discharge valve 37 of the high-stage compression section 22 is disposed within this discharge valve chamber 36. There is.

During operation of the compressor main body, low-pressure gas such as refrigerant gas sucked into the compression chamber 26 of the low-stage compression mechanism section 21 through the gas suction hole 30 is compressed by the low-stage compression mechanism section 21. , is discharged from the low stage compression mechanism section 21 through the first discharge valve 31 and second discharge valve 32 of the low stage side pressure m mechanism section 21, respectively, and this discharged gas is further discharged from the high stage side pressure sin mechanism section 22. The gas suction hole 35 is introduced into the compression chamber 29 of the high-stage compression mechanism section 22, and the compressed gas compressed to an even higher pressure state by the high-stage compression mechanism section 22 is introduced into the compression chamber 29 of the high-stage compression mechanism section 22. Lateral pressure IIi! The air is discharged from the higher stage compression mechanism section 22 via the discharge valve 37 of the mechanism section 22.

Therefore, in the above configuration, the low stage compression 111 section 21 is provided with the first discharge valve 31 and the second discharge valve 32, so that the low stage compression mechanism section 21 has a single discharge valve. 12
Compared to the case where only one (as shown in FIG. 4) is provided, pressure loss in the lower stage compression mechanism section 21 can be reduced and performance can be improved.

In addition, since the second discharge valve chamber 33 of the low-stage compression mechanism section 21 is provided in the partition plate 23 that partitions between the low-stage compression mechanism section 21 and the high-stage compression mechanism section 22, the low-stage compression mechanism section 21 Mechanism part 21
The second side of the lower stage compression mechanism section 21 is attached to the peripheral wall surface of the cylinder 25.
Compared to the case where the discharge valve chamber 18 (shown in FIG. 5) is formed, the processing of the lower stage compression mechanism section 21 can be made easier. Furthermore, the inner diameter dimension D1 of the compression chamber 26 of the lower stage side compression mechanism section 21 is formed to be larger than the inner diameter dimension D2 of the compression chamber 29 of the higher stage side compression mechanism section 22, and the lower stage side compression ll
The second part of the low stage compression mechanism part 21 is located at a position corresponding to the outer side of the compression v29 of the high stage side pressure m mechanism part 22 on the partition plate 23 that partitions between the N structure part 21 and the high stage compression mechanism part 22.
Since the discharge valve chamber 33 is disposed, an appropriate gap δ can be formed between the second discharge valve chamber 33 of the partition plate 23 and the compression chamber 29 of the high-stage compression mechanism section 22. Therefore,
Since the second discharge valve chamber 18 of the low stage compression mechanism section 21 can be reliably sealed by the outer part of the compression chamber 29 of the high stage compression mechanism section 22, the second discharge valve chamber 18 of the low stage side pressure wBtlIs section 21 can be reliably sealed. There is no need to specifically provide an auxiliary partition plate 20 (shown in FIG. 6) that seals between the discharge valve chamber 18 and the high-stage compression mechanism section 22, and the low-stage compression mechanism section 21 and the high-stage compression mechanism section It is possible to prevent the thickness of the partition plate 23 between the partition plate 23 and the portion 22 from increasing.

Note that this invention is not limited to the above embodiments. For example, the high stage compression mechanism 822 is replaced by the low stage compression mechanism section 2.
1 may be arranged above. -Also, as shown in FIG. 3, the first. The second discharge valve 31, 32 and the discharge valve 37 of the high-stage compression mechanism section 22
may each be formed into an arc shape with a radius R along the arc shape of the inner peripheral surface of the compression chamber 26.29 of the compression mechanism section 21.22. Furthermore, it goes without saying that various other modifications can be made without departing from the gist of the invention.

[Effects of the Invention] According to this invention, the inner diameter of the compression chamber of the lower stage rotary pressure mi structure is formed to be larger than the inner diameter of the compression chamber of the higher stage rotary compression mechanism, and A second discharge valve chamber of the low-stage compression mechanism is located at a position corresponding to the outer side of the compression chamber of the high-stage pressure m mechanism on the partition plate that partitions the stage-side compression mechanism and the high-stage compression mechanism. , it is possible to reduce pressure loss in the low stage side pressure ts11 structure and improve performance, and there is no risk that machining of the low stage side compression mechanism will become particularly difficult. It is possible to prevent the thickness of the partition plate between the compressor groove portion and the high-stage compression mechanism portion from increasing.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a vertical cross-sectional view showing the schematic structure of the compression mechanism of a two-stage compression l, and FIG. 2 is the same as that shown in FIG. ■-■ line sectional view, 3rd
FIG. 4 is a plan view showing another actual example; FIGS. 4 to 6 show a conventional example; FIG. Figure 5 is a $1 sectional view of the main part showing the state in which the second discharge valve of the low stage compression mechanism is provided on the peripheral wall surface of the cylinder of the low stage compression mechanism, and Figure 6 is a $1 sectional view of the main part of the low stage compression mechanism. FIG. 7 is a longitudinal cross-sectional view of the main part showing a state in which the second discharge valve of the mechanism section is provided on the partition plate. 21... Low-stage compression mechanism section, 22... High-stage compression mechanism section, 23... Intermediate partition plate, 26.29... Compression chamber, 32... Second discharge valve, 33 ...Second discharge valve chamber. Applicant's agent Patent attorney Takehiko Suzue 32 Tomi 2 ot Idei Figure 1 Figure 2 Figure 3 Figure 4 Kasumi Figure 5 Figure 6

Claims (2)

[Claims] (1) In a two-stage compression type compressor in which rotary compression mechanism sections are stacked in two stages, and a fluid to be compressed is compressed in two stages by a low-stage compression mechanism section and a high-stage compression mechanism section, the low-stage compression mechanism section The inner diameter of the compression chamber of the compression mechanism section is larger than the inner diameter of the compression chamber of the high-stage compression mechanism section, and a space between the low-stage compression mechanism section and the high-stage compression mechanism section is formed. A two-stage compression type compression device, characterized in that a second discharge valve chamber of the low-stage compression mechanism section is disposed at a position corresponding to an outer part of the compression chamber of the high-stage compression mechanism section on the partition plate. Machine. (2) The low-stage compression mechanism section includes a first discharge valve disposed on either the main bearing or the sub-bearing of the compressor main body, the low-stage compression mechanism section, and the high-stage compression mechanism section. A two-stage compression type compressor according to claim 1, characterized in that the second discharge valve is provided on a partition plate that partitions the two-stage compression type compressor.