CN101100999A

CN101100999A - Rotary compressor and refrigeration cycle device using the same

Info

Publication number: CN101100999A
Application number: CNA2007101274988A
Authority: CN
Inventors: 平山卓也; 知念武士
Original assignee: Toshiba Carrier Corp
Current assignee: Toshiba Carrier Corp
Priority date: 2006-07-03
Filing date: 2007-07-02
Publication date: 2008-01-09
Anticipated expiration: 2027-07-02
Also published as: KR20080003722A; KR100866439B1; CN100540901C; JP2008014150A; JP4864572B2

Abstract

The present invention provides a high efficiency rotary compressor. The rotary compressor is single cylinder type rotary compressor (2), the inner diameter of the single cylinder (12) is Dcy, the height of the cylinder (10) is H, the axis diameter of the eccentricity part (4c) of a rotary axis (4) is Dcr. When the contact length in axis direction of the eccentricity part (4c) of the rotary axis (4) and a roller (13) is L, the value of H/Hcy is below or equal to 0.4, and the value of L/Dcr is above or equal to 0.6.

Description

Rotary compressor and use the refrigerating circulatory device of this rotary compressor

Technical field

The present invention relates to a kind of rotary compressor and use the refrigerating circulatory device (refrigeration cycle apparatus) of this rotary compressor, relate in particular to rotary compressor that the structure to compressor section improves and the refrigerating circulatory device that uses this rotary compressor.

Background technique

The compressor that uses in air conditioner or refrigerator etc. is generally rotary compressor.This rotary compressor comprises: cylinder (cylinder); Be arranged in this cylinder, with the roller bearing (roller) of the eccentric rotation of eccentric part of running shaft; And with cylinder be divided into hyperbaric chamber and low pressure chamber, with the off-centre of above-mentioned roller bearing rotatablely move move back and forth cut air valve (vane).

On the other hand, in this type of rotary compressor, for realizing energy-conservationization (saving of energy), and require high compression rate,, must improve the efficient of compressor section for realizing this high compression rate.

For improving the efficient of this compressor section, the assembly that forms the pressing chamber of compressor section must be defined as and be accommodated in such yardstick (dimension) in the optimal design point.

The eliminating volume V of rotary compressor can be tried to achieve by following formula, and establishing cylinder chamber's internal diameter is Dcy, and the height of cylinder is H, and bent axle (crack) offset is e,

V≈πe(Dcy-e)H

In this formula, getting rid of under the certain situation of volume, constituting for example height H of cylinder of factor, then must change crankshaft eccentric amount e or the inside diameter D cy of cylinder chamber, be difficult to observe merely 1 influence that constitutes factor if change 1.

Therefore, proposing a kind of rotary compressor that improves compression efficiency in for example Japanese patent laid-open 8-144976 communique (hereinafter referred to as patent documentation 1), is D establishing cylinder chamber's internal diameter, and the height of cylinder is H, when making the offset of the running shaft of the eccentric rotation of roller bearing be e

0.07≤H/(Dcy·e)≤0.13

Yet, in the rotary compressor that proposes in the patent documentation 1, though considered the scope of H/D, but do not consider H/D and the relation of relation, H/D and blade (blade) slippage loss of leakage (leak) amount of the refrigeration agent that spills from sealed department (sealed portion) and the relation of L/Dcr (diameter of axle of the eccentric part of running shaft) and crank portion slippage loss, therefore the leeway of improvement still arranged for the raising of compression efficiency.

For example, in the goods of the reality of in the past rotary compressor, the different numbers of cylinder (single cylinder type (single cylinder type), two cylinder type (two-cylinder type)) and H/Dcy, the L/Dcr of different size are as shown in table 1, do not limit within the limits prescribed.

[table 1]

The H/Dcy of well-known rotary compressor and the value of L/Dcr

Single cylinder type			Two cylinder type
Single cylinder type			Two cylinder type			Specification	H/Dcy	L/Dcr	Specification	H/Dcy	L/Dcr
A	0.303	0.477	A	0.167	0.344	Specification	H/Dcy	L/Dcr	Specification	H/Dcy	L/Dcr
A	0.303	0.477	A	0.167	0.344	B	0.32	0.49	B	0.25	0.431
C	0.372	0.4	C	0.333	0.367	B	0.32	0.49	B	0.25	0.431
C	0.372	0.4	C	0.333	0.367	D	0.567	0.583	D	0.359	0.391
E	0.75	0.783	E	0.444	0.507	D	0.567	0.583	D	0.359	0.391

Therefore, the present invention has found that except that Dcy and H Dcr and L also can produce bigger influence to the compression efficiency of rotary compressor, can realize a kind of high efficiency rotary compressor by the scope that limits H/Dcy, L/Dcr.

Summary of the invention

Consider above-mentioned situation, the object of the present invention is to provide a kind of high efficiency rotary compressor.

In addition, another object of the present invention is to provide a kind of high efficiency refrigerating circulatory device.

For achieving the above object, rotary compressor of the present invention is the single cylinder type rotary compressor with a compression mechanical part, described compression mechanical part comprises: be formed with the cylinder of cylinder chamber and engage with the eccentric part of running shaft and in cylinder chamber the roller bearing of eccentric rotation, it is characterized in that, if the internal diameter of described cylinder chamber is Dcy, the height of cylinder is H, the diameter of axle of the eccentric part of running shaft is Dcr, when the eccentric part of running shaft and roller bearing are L at axial contact length, H/Dcy≤0.4 and L/Dcr 〉=0.6.

Refrigerating circulatory device of the present invention is characterised in that, comprising: above-mentioned compressor, condenser, expansion gear and vaporizer.

Utilize rotary compressor of the present invention, a kind of high efficiency rotary compressor can be provided.

In addition, utilize refrigerating circulatory device of the present invention, a kind of high efficiency refrigerating circulatory device can be provided.

Description of drawings

Fig. 1 is the rotary compressor of the embodiment of the invention 1, the concept map of refrigerating circulatory device.

Fig. 2 is the H/D of rotary compressor of the embodiment of the invention 1 and the linear relationship chart of freezing medium leakage amount.

Fig. 3 is the linear relationship chart of the slippage loss of the H/D of rotary compressor of the embodiment of the invention 1 and blade.

Fig. 4 is the L/Dcr of rotary compressor of the embodiment of the invention 1 and the linear relationship chart of crank portion slippage loss.

Fig. 5 is the longitudinal sectional view of the rotary compressor of the embodiment of the invention 2.

Fig. 6 is the longitudinal sectional view of variation 1 of supplementary bearing of the rotary compressor of the embodiment of the invention 1.

Fig. 7 is the longitudinal sectional view of variation 2 of supplementary bearing of the rotary compressor of the embodiment of the invention 1.

Fig. 8 is the longitudinal sectional view of variation of compressor section of the rotary compressor of the embodiment of the invention 1.

(symbol description)

1 rotary compressor, 2 compressor sections

3 seal containers, 4 running shafts

4a main shaft part 4b countershaft portion

4c eccentric part 5 motor part

8 main bearings, 9 supplementary bearings

10 cylinders, 12 cylinder chamber

13 roller bearings, 15 blade grooves

16 blades, 21 refrigerating circulatory devices

22 condensers, 23 expansion gears

24 vaporizers

Embodiment

With reference to accompanying drawing to the rotary compressor of the embodiment of the invention 1 and use the refrigerating circulatory device of this rotary compressor to describe.

Fig. 1 is the rotary compressor of the embodiment of the invention 1 and the concept map that uses the refrigerating circulatory device of this rotary compressor.

As shown in Figure 1, refrigerating circulatory device 21 of the present invention forms for the circulation shape by rotary compressor 1, condenser 22, expansion gear 23 and vaporizer 24 connections with present embodiment 1.

Rotary compressor 1 is the single cylinder type with 1 rotary compression device (rotary-type compressionapparatus) 2, compressor section 2 is housed in bottom in the seal container (sealed case) 3, and will be housed in top by the motor part 5 of running shaft 4 Driven Compressor portions 2.

This motor part 5 contains: be pressed into and be fixed in the stator (stator) 6 in the seal container 3 and be housed in rotor (rotor) 7 in this stator 6.

On the running shaft 4 of support rotor 7, main shaft part 4a can be supported by the main bearing of compressor portion 2 (upper bearing (upper bearing)) 8 with rotating freely, and the 4b of countershaft portion can be supported by supplementary bearing 9 (lower bearing (lower bearing)) with rotating freely.

Main bearing 8 and supplementary bearing 9 are clamped cylinder (piston-cylinder unit (cylinder block)) 10 from both sides, be fixed in cylinder 10 thereby utilize screw 11 and cylinder 10 to screw togather.

In the cylinder 10 of compressor section 2, be formed with the cylinder chamber 12 that is divided into by cylinder block internal diameter (cylinder bore), contain roller bearing 13 in this cylinder chamber 12.Roller bearing 13 engages with the eccentric part 4c of running shaft 4, along with the rotation driving of running shaft 4, carries out the off-centre rotation on cylinder chamber 12 inner edge rolling limits.

Link the diameter of axle of the diameter of axle d of the 4b of countershaft portion that is provided with less than running shaft 4 (main shaft part 4a) with the bottom of eccentric part 4c, the opposition side outer circumferential face 4c1 of the eccentric side of eccentric part 4c is consistent with the outer circumferential face 4b1 of the 4b of countershaft portion.And the lower end surface of supplementary bearing 9 is provided with the thrust bearing part 14 that bears the thrust loading of running shaft 4 by the 4b of countershaft portion.

In addition, compressor section 2 is formed with the blade groove 15 that extends to radial direction foreign side from the inner peripheral surface of cylinder block internal diameter (cylinder inner peripheral surface), contain blade 16 in this blade groove 15, thereby this blade 16 is by spring 17 application of forces pushing roller bearing 13, and this blade 16 is divided into all not shown suction side room (chamber) and compression side room with cylinder chamber 12.

The both sides of clamping blade groove (blade slot) 15 on the cylinder 10 are provided with the suction port (not shown) that is communicated with suction pipe 18, and main bearing 8 is provided with exhaust port 19.

Next, the diameter of axle Dcr of the height H of the inside diameter D cy of cylinder chamber 12, cylinder 10, eccentric part 4c and eccentric part 4c and roller bearing 13 are described at relation and each yardstick of axial contact length L.

According to inventor's etc. research as can be known, as shown in Figure 2, the relation of the H/Dcy in the rotary compressor of same eliminating volume, same offset and the leakage rate of refrigeration agent is, along with the increase of H/Dcy, leakage rate increases with straight line roughly.Its reason is, if H/Dcy increases, then roller bearing and the seal length between cylinder as reigning leakage portion increases, and makes the leakage rate of this part increase.

In addition, as can be known, the relation of the H/Dcy in the rotary compressor of same eliminating volume, same offset and the slippage loss of blade side and front end is that along with the increase of H/Dcy, the slippage loss of blade is with roughly straight line increase among Fig. 3.Its reason is that if H/Dcy increases, the load that then acts on the blade side and the back side increases, and the slippage loss that reaches the blade front end between blade and blade groove is increased.

On the other hand, as shown in Figure 4, the relation of L/Dcr and eccentric axial portion slippage loss is that along with L/Dcr reduces, slippage loss sharply increases.

Particularly, as shown in Figure 2,, can reduce the leakage rate between roller bearing and cylinder by making H/Dcy≤0.4, as shown in Figure 3, by making H/Dcy≤0.4, can reduce the slippage loss of blade, in addition, as shown in Figure 4, by making L/Dcr 〉=0.6, can significantly reduce the eccentric axial portion slippage loss.

According to these knowledge, can finish the present invention, the relation of Dcy, H, Dcr, L is set at

[formula 1]

H/Dcy≤0.4，L/Dcr≥0.6。

In order to raise the efficiency, L/Dcr is increased to a certain degree, if H/Dcy is reduced, then can be difficult to make the problem of L/Dcr increase, yet utilize the present invention, can under the situation that does not cause efficient to reduce, set the reduction of the leakage rate between realization roller bearing and cylinder, the reduction of the slippage loss of blade and the reduction of eccentric axial portion slippage loss, thereby the high efficiency of realization rotary compressor to the value of Dcy, L, Dcr.

Utilize the rotary compressor of present embodiment 1, can realize high efficiency rotary compressor.

In addition, utilize refrigerating circulatory device of the present invention, can realize high efficiency refrigerating circulatory device.

Next, the rotary compressor to the embodiment of the invention 2 describes.

With respect to embodiment 1 the single cylinder type with 1 compressor section, present embodiment 2 is the rotary compressors with two cylinder type of 2 compressor sections.

For example, as shown in Figure 5, the rotary compressor 1A of present embodiment 2 is provided with 2 groups of compression mechanical part 2A1,2A2 of same structure across partition member 25A.

Compression mechanical part 2A2 with downside is that example describes, and the diameter of axle Dcr of the height H of the inside diameter D cy of cylinder chamber 12, cylinder 10, eccentric part 4c and eccentric part 4c and roller bearing 13 are carried out following setting at relation and each yardstick of axial contact length L.

[formula 2]

H/Dcy≤0.3，L/Dcr≥0.5。

In the rotary compressor of present embodiment 2, owing to have 2 cylinders 10, therefore compare with single cylinder type and become 2 times (under the identical situations of cylinder shape) in essence with respect to the H of Dcy.Therefore, in order to obtain high efficiency, must make H/Dcy become littler.Yet, under the situation that H/Dcy is reduced, be difficult to make L/Dcr to increase, therefore in the rotary compressor of present embodiment 2, H/Dcy and L/Dcr are set at H/Dcy≤0.3, higher efficient can be realized in L/Dcr 〉=0.5 o'clock.

Other structure is identical with rotary compressor shown in Figure 1, therefore marks prosign and has omitted explanation.

In addition, the variation 1 to embodiment 1 supplementary bearing describes.

The supplementary bearing that bears countershaft portion with respect to embodiment 1 is sliding bearing (plain bearing), is provided with rolling bearing in this variation 1 on supplementary bearing.

For example, as shown in Figure 6, be provided with the rolling bearing 9Ba that bears the 4b of countershaft portion among the supplementary bearing 9B of this variation 1.

Satisfy H/Dcy≤0.4, L/Dcr 〉=0.6 must dwindle the diameter of axle Dcr with respect to the eccentric part 4c of load, if Dcr reduces, then for roller bearing 13 is engaged with eccentric shaft 4a, the diameter of axle d of the 4b of countershaft portion is also dwindled.If this diameter of axle d is dwindled, then sliding bearing wear away easily, heating etc., cause reliability decrease.By using the bearing of rolling bearing 9Ba as the 4b of countershaft portion, make lubricity good, friction factor reduces, and prevents abrasion, heating etc., thereby reduces also can not reduce the high efficiency rotary compressor of reliability even realize a kind of diameter of axle d.As rolling bearing, except that illustrated ball bearing (ball bearing), also can adopt roller bearing (roller bearing), needle bearing (needleroller bearing) etc.

In this variation 2, be coated with cylindric sleeve (cylindricalbushing) in embodiment 1 countershaft portion outside.

For example, as shown in Figure 7, be provided with bigbore bearing 9Ca among the supplementary bearing 9C of this variation 2, this bigbore bearing 9Ca bears the cylindric sleeve 4Bb that is covered in countershaft portion 4b outside.At this moment, after making roller bearing 13 and the eccentric part 4c of running shaft 4 engaging, cylindric sleeve 4Bb is covered in countershaft portion 4b outside, thereby can produce harmful effect the assembling operation of roller bearing 13

Thus, can obtain the identical effect of scheme with the diameter of axle that enlarges the 4b of countershaft portion in essence, even adopt sliding bearing 9Ca also can improve reliability.

Variation to embodiment 1 compressor section describes below.

Have main bearing, these 2 bearings of supplementary bearing among the embodiment 1, and removed supplementary bearing in this variation, only kept main bearing.

For example, as shown in Figure 8, on the running shaft 4D of the compressor section 2D of this variation countershaft is not set, the supplementary bearing that bears countershaft portion is not set yet.Be provided with the inaccessible plate 26D that delimit cylinder chamber 12 and bear the thrust (thrust force) of running shaft 4D and substitute supplementary bearing, and main bearing 8D compares with embodiment 1 main bearing, has sufficient bearing bore and length.

Thus, can realize a kind ofly guaranteeing reliability, utilize the single-shaft configuration of no supplementary bearing make the design of the diameter of axle of countershaft portion unrestricted in case satisfy H/Dcy≤0.4, L/Dcr 〉=0.6, high efficiency, rotary compressor cheaply.

In addition, being example with embodiment 1 rotary compressor is illustrated variation 1, the variation 2 of supplementary bearing and the variation of removing the compressor section of supplementary bearing, yet also can be applicable to embodiment 2 rotary compressor.

Claims

1, a kind of rotary compressor, it is single cylinder type rotary compressor with a compression mechanical part, described compression mechanical part comprises: be formed with the cylinder of cylinder chamber and engage with the eccentric part of running shaft and in cylinder chamber the roller bearing of eccentric rotation, it is characterized in that

If the internal diameter of described cylinder chamber is Dcy, the height of cylinder is H, and the diameter of axle of the eccentric part of running shaft is Dcr, when the eccentric part of running shaft and roller bearing are L at axial contact length, and H/Dcy≤0.4 and L/Dcr 〉=0.6.

2, a kind of rotary compressor, be two cylinder type rotary compressors with two compression mechanical parts, described compression mechanical part comprises: be formed with the cylinder of cylinder chamber and engage with the eccentric part of running shaft and in cylinder chamber the roller bearing of eccentric rotation, it is characterized in that

If the internal diameter of described cylinder chamber is Dcy, the height of cylinder is H, and the diameter of axle of the eccentric part of running shaft is Dcr, when the eccentric part of running shaft and roller bearing are L at axial contact length, and H/Dcy≤0.3 and L/Dcr 〉=0.5.

3, rotary compressor as claimed in claim 1 or 2 is characterized in that, comprises the main bearing of the main shaft part that supports described running shaft and the supplementary bearing of the countershaft portion that supports described running shaft, has rolling bearing between countershaft portion and supplementary bearing.

4, rotary compressor as claimed in claim 1 or 2, it is characterized in that, comprise the main bearing of the main shaft part that supports described running shaft and the supplementary bearing of the countershaft portion that supports described running shaft, the eccentric part engaging of described running shaft has roller bearing, and the countershaft portion outside of described running shaft is coated with sleeve cylindraceous.

5, a kind of refrigerating circulatory device is characterized in that, comprising: each described compressor, condenser, expansion gear and vaporizer in the claim 1 to 4.