CN109595167A - High reliablity, performance good three cylinder twin-stage positive displacement compressors and air conditioner - Google Patents

Abstract

The invention discloses a kind of high reliablity, performance good three cylinder second level positive displacement compressors and air conditioner.Wherein the three cylinder second level positive displacement compressors include: shell, upper flange, upper cylinder on crankshaft, the middle partition with inner cavity, middle cylinder, lower cylinder and the lower flange with inner cavity.Housing cavity is separated into two closed chambers up and down by upper flange, i.e., is second level high pressure gas chamber on the upside of upper flange, and on the downside of upper flange is intermediate cavity；Via the gas after lower cylinder, middle cylinder first compression, alternatively, via the gas after middle cylinder first compression, be discharged into intermediate cavity and with fill into gas mixing after, then via being discharged into second level high pressure gas chamber after upper cylinder second-compressed.Due to using intermediate cavity external structure, middle divider height is reduced, and the deformation of crankshaft reduces, and improves the reliability of compressor.The length for shortening middle pressure runner improves compressor performance so that high pressure cylinder air-breathing is more smooth.Cylinder block inside and outside differential pressure reduces, and the leakage rate of refrigerant reduces, and the refrigerating capacity or heating capacity of compressor is improved, to improve the performance of refrigeration system.

Description

High reliablity, performance good three cylinder twin-stage positive displacement compressors and air conditioner

Technical field

The present invention relates to roller compressor technical field more particularly to a kind of high reliablity, three cylinders haveing excellent performance double-click Positive displacement compressor and air conditioner.

Background technique

Three current cylinder twin-stage positive displacement compressors generally comprise the lower cylinder and middle cylinder and a high pressure of one or two of low pressure Upper cylinder control whether lower slide plate works usually using lower cylinder as transfiguration cylinder by pin and pin spring, have double Two kinds of operating modes of cylinder and three cylinders.The level-one discharge chamber of middle cylinder is arranged in the ontology of middle partition, is used as intermediate cavity, and lower gas The level-one discharge chamber of cylinder is arranged in the ontology of lower flange, is used as intermediate cavity.In in intermediate cavity and middle partition in lower flange Between chamber be connected to and be connected to the air entry of upper cylinder.That is the intermediate cavity of the lower flange and middle partition intermediate cavity that is embedding structure. Gas supplementing opening is connected to upper cylinder air entry, and level-one exhaust and tonifying Qi mixing are used as second level air-breathing, the compression exhaust shape through upper cylinder At secondary exhaust.

According to previous design experiences, to guarantee that compressor has good efficiency, the intermediate cavity volume in middle partition is necessary The discharge capacity of cylinder in greater than twice, therefore the thickness of the middle partition of three cylinder compressors is higher, leads to eccentric and lower bias on crankshaft Span it is larger, then the deformation of crankshaft will increase when compressor operating, and the reliability of compressor reduces.By lower cylinder and middle cylinder The gas of sucking is discharged after first compression to be vented for level-one, i.e., enters in the pump housing by the intermediate cavity level-one exhaust in lower flange It is mixed in the intermediate cavity of partition with the exhaust of middle cylinder level-one, is flowing through upper cylinder air entry again with tonifying Qi gas mixing, then by upper Cylinder second level air-breathing.That is the gas of upper cylinder second level sucking is by the exhaust of lower flange level-one, the exhaust of middle cylinder level-one and upper cylinder The gas of tonifying Qi composition.Since the runner of second level air-breathing is longer, runner flow resistance loss is larger, gas supplementing opening limited volume, and second level is inhaled Gaseous pulse is dynamic big, it will reduces the performance of compressor.The lower cylinder of low pressure and middle cylinder, inside and outside refrigerant pressure differential is larger, refrigerant Leakage rate it is larger, be easily reduced the refrigerating capacity or heating capacity of compressor, thus reduce refrigeration system performance.

Therefore, how to overcome the reliability of existing three cylinders double-stage compressor lower；The efficiency and refrigeration system of compressor The defect of reduced performance be industry urgent problem to be solved.

Summary of the invention

The present invention is in order to solve existing compressor since span eccentric on crankshaft and lower bias is larger；Second level air-breathing runner Length it is longer, low-pressure cylinder refrigerant is easy leakage and compressor reliability is caused to reduce and compressor and refrigeration system The technical issues of performance declines provides a kind of high reliablity, performance good three cylinder second level positive displacement compressors and air conditioner.

A kind of three cylinders twin-stage positive displacement compressor proposed by the present invention comprising: shell, upper flange on crankshaft, on Cylinder, the middle partition with inner cavity, middle cylinder, lower cylinder and the lower flange with inner cavity.The upper flange will be in the shell Chamber is separated into two closed chambers up and down, i.e., is second level high pressure gas chamber on the upside of the described upper flange, and on the downside of the upper flange For intermediate cavity；Via the gas after the lower cylinder, middle cylinder first compression, alternatively, after via the middle cylinder first compression Gas, be discharged into the intermediate cavity and with fill into gas mixing after, then it is described via being discharged into after the upper cylinder second-compressed Second level high pressure gas chamber.

Preferably, the intermediate cavity on the downside of the upper flange is the cavity on the downside of upper flange between housing bottom pasta, institute The discharge capacity of the volume and the upper cylinder, middle cylinder and lower cylinder of stating intermediate cavity meets following relationship:

0.7 >=V1/(V2+V3) >=0.5；1≥V1/V2≥0.8；2.2≥V2/V3≥1.4；5 >=V4/(V2+V3) >=2；

7≥V4/V1≥4；Wherein:

V1 is the discharge capacity of upper cylinder, V2 is the discharge capacity of middle cylinder, V3 is lower cylinder discharge capacity, and V4 is the volume of intermediate cavity.

Preferably, the gas after the middle cylinder first compression is discharged into described via the inner cavity of the middle partition Between chamber；Gas after the lower cylinder first compression is discharged into the intermediate cavity via the inner cavity of the lower flange；The benefit Enter gas and is discharged into the intermediate cavity via the inner cavity of the lower flange.

Preferably, the upper flange is equipped with the high pressure gas group for being connected to the upper cylinder with the second level high pressure gas chamber Part.

Preferably, the upper cylinder is equipped with the air entry for being connected to the intermediate cavity.

Preferably, the inner cavity of the middle partition be equipped be connected to the first exhaust component of the middle cylinder be equipped with and be connected to described in The first through hole of intermediate cavity.

Preferably, the air inlet for filling into gas is additionally provided on the cylinder body of the lower cylinder.

Preferably, the inner cavity of the lower flange be equipped be connected to the second exhaust component of the lower cylinder be equipped with and be connected to described in Second through-hole of intermediate cavity；The inner cavity of the lower flange is additionally provided with and the tonifying Qi component for filling into gas connection.

Preferably, the side of the middle partition is equipped with groove, is equipped on the groove and is used as closed upper spacer, the closing Groove be the middle partition inner cavity.

Preferably, the back side of the lower flange is equipped with groove, is equipped on the groove and is used as closed lower cover plate, the closing Groove be the lower flange inner cavity.

The invention also provides a kind of air conditioners comprising the three cylinder twin-stage positive displacement compressors.

The present invention is set to the external structure between cylinder block and shell using intermediate cavity, so that the height of middle partition reduces, It shortens the eccentric span of crankshaft or more and improves the reliability of compressor so that the deformation of crankshaft reduces.Due to using intermediate The volume of chamber external structure, intermediate cavity greatly increases, so that intermediate cavity pressure oscillation reduces, makes cylinder and lower cylinder row in low pressure Gas is smooth, and high pressure upper cylinder pressure of inspiration(Pi) is steady, reduces level-one overcompression loss, reduces two-stage compression power consumption, improves compressor Performance.Intermediate cavity and the direct connection of upper cylinder second level air entry shorten the length of second level air-breathing (middle pressure) runner, reduce two The loss of suction of grade air-breathing runner flow resistance loss and high pressure cylinder, keeps high pressure cylinder air-breathing more smooth, reduces the work done during compression of upper cylinder, Improve compressor performance.After intermediate cavity external structure, the middle cylinder of low pressure and the outside of lower cylinder are medium pressure gas, cylinder Inside and outside pressure difference reduces, and the leakage rate of refrigerant reduces, and the refrigerating capacity or heating capacity of compressor is improved, to improve refrigeration The performance of system.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the embodiment of the present invention；

Fig. 2 is the schematic diagram of the pump assembly in Fig. 1；

Fig. 3 is the top view of the upper flange of the embodiment of the present invention；

Fig. 4 is the bottom view of the upper cylinder of the embodiment of the present invention；

Fig. 5 is the top view of the middle partition of the embodiment of the present invention；

Fig. 6 is the bottom view of the lower flange of the embodiment of the present invention.

Specific embodiment

The present invention will be described in detail with reference to the accompanying drawings and examples.

As shown in Figure 1, an embodiment of three cylinders twin-stage positive displacement compressor proposed by the present invention comprising: by cover assembly 16, the compressor housing that cylinder 12 and lower cover 11 are constituted, is set to the intracorporal electric machine assembly 15 of the shell and pump assembly 14.Set on shell Dispenser component 10, the lower flange into pump assembly 14 that external middle cylinder, lower cylinder with pump assembly 14 is connected to Inner cavity fill into the increasing enthalpy component 13 of gas.As shown in Fig. 2, the pump assembly 14 includes successively being set on crankshaft 20 Upper flange 21, upper spacer 23, the middle partition 24 with inner cavity, middle cylinder 25, lower clapboard 26, lower cylinder 27, has upper cylinder 22 The lower flange 28 and lower cover plate 29 of inner cavity.The ontology of lower flange 28 is equipped with pin spring 31 and pin 30, in pin spring 31 Elastic force effect under, pin 30 blocks the slide plate 32 in lower cylinder 27.Upper spacer 23, which is closed in, to be set on reeded middle partition 24 Side, so as to the inner cavity of partition in constituting.Upper cover plate 29, which is closed in, sets reeded 28 back side of lower flange, to constitute lower flange Inner cavity.Fig. 1 please be read, the outer circle of the upper flange 21 and the inner circle of compressor housing are fitted close, so that housing cavity is divided into Upper and lower two closed chambers.That is the closed chamber of 21 upside of upper flange is second level high pressure gas chamber 110,21 downside of upper flange and shell bottom Cavity between portion's pasta is intermediate cavity 100.Middle cylinder 25 and lower cylinder are respectively enterd by the low-pressure gas that dispenser 10 sucks 27, the gas in after 25 first compression of cylinder is discharged into intermediate cavity 100 via the inner cavity of middle partition；It is once pressed through lower cylinder 27 Gas after contracting is discharged into intermediate cavity 100 via the inner cavity of lower flange；Gas is filled into via lower flange 28 from increasing enthalpy component 13 Inner cavity enter intermediate cavity 100 and mixed with the level-one exhaust from middle cylinder 25 and lower cylinder 27, then sucked by upper cylinder 22 Second-compressed is carried out, and second level high pressure gas chamber 110 is discharged by upper flange 21.Alternatively, lower cylinder 25 does not work, cylinder 25 in Gas after first compression is discharged into intermediate cavity 100 via the inner cavity of middle partition；Gas is filled under from increasing enthalpy component 13 The inner cavity of flange 28 enters intermediate cavity 100 and mixes with the level-one exhaust from middle cylinder 25, then is gone forward side by side by the sucking of upper cylinder 22 Row second-compressed, and second level high pressure gas chamber 110 is discharged by upper flange 21.

As shown in Figure 1 and Figure 2, the discharge capacity of the volume Yu upper cylinder 22, middle cylinder 25 and lower cylinder 27 of intermediate cavity 100 meets Following relationship: 0.7 >=V1/(V2+V3) >=0.5；1≥V1/V2≥0.8；2.2≥V2/V3≥1.4；5 >=V4/(V2+V3) >=2； 7≥V4/V1≥4；Wherein: V1 is the discharge capacity of upper cylinder, V2 is the discharge capacity of middle cylinder, V3 is lower cylinder discharge capacity, and V4 is centre The volume of chamber.The discharge capacity of the volume and upper cylinder 22, middle cylinder 25 and lower cylinder 27 that guarantee intermediate cavity 100 meets relation above, Refrigerating capacity or heating capacity can be improved, so that the efficiency of compressor increases.

In the present embodiment, as shown in figure 3, upper flange 21 is equipped with the compression chamber of upper cylinder 22 and second level high pressure gas chamber The high pressure gas component 211 of 110 connections.As shown in figure 4, upper cylinder 22 is equipped with the air entry of connection intermediate cavity 100.Such as Fig. 5 institute Show, the inner cavity of middle partition 24 is equipped with the first exhaust component 241 of 25 compression chamber of cylinder in connection, and the inner cavity of middle partition 24 is additionally provided with It is connected to the first through hole 242 of intermediate cavity 100.It is connected to referring to Fig. 1, being additionally provided on the right side of 27 cylinder body of lower cylinder with increasing enthalpy component 13 The air inlet for filling into gas.As shown in fig. 6, the inner cavity of lower flange 28 is equipped with the second exhaust group of connection 27 compression chamber of lower cylinder Part 281, the inner cavity of lower flange 28 are equipped with the second through-hole 283 of connection intermediate cavity 100；The inner cavity of lower flange 28 is additionally provided with and lower gas The tonifying Qi component 282 of the air inlet connection for filling into gas on 27 cylinder body of cylinder.

Incorporated by reference to Fig. 1 ~ Fig. 6, compressor is passed through medium pressure gas on pin 30, is forced pin with three cylinder working mode operations Nail 30 glides and is detached from slide plate 32.Middle cylinder 25 and lower cylinder 27 suck low-pressure gas by dispenser 10 respectively.The cylinder in The level-one exhaust that 25 first compressions are formed, via the first exhaust component 241 of middle partition 24 enter in partition inner cavity, then by the One through-hole 242 enters intermediate cavity 100；The level-one exhaust formed through 27 one stage of compression of lower cylinder, via the second row of lower flange 28 Pneumatic module 281 enters the inner cavity of lower flange, then enters intermediate cavity 100 by the second through-hole 283；Gas is filled into from increasing enthalpy component 13 Body by lower flange 28 tonifying Qi component 282 enter lower flange inner cavity, then by the second through-hole 283 enter intermediate cavity 100 and with Mixing composition second level is vented from the level-one of middle cylinder 25 and lower cylinder 27 and sucks gas, is inhaled by the air entry 221 of upper cylinder 22 Enter to carry out second-compressed, and forms secondary exhaust and be discharged into second level high pressure gas chamber from the high pressure gas component 211 of upper flange 21 110, it is finally discharged by the gas vent of the cover assembly of compressor 16, into air-conditioning system.

Incorporated by reference to Fig. 1 ~ Fig. 6, compressor is passed through air-breathing low-pressure gas with the operation of twin-tub operating mode on pin 30, Pin 30 blocks slide plate 32 under the effect of pin spring 31, and lower cylinder 27 does not work at this time.Middle cylinder 25 is sucked by dispenser 10 Low pressure air suction forms the inner cavity of partition in the entrance of first exhaust component 241 that level-one exhaust passes through middle partition 24 through first compression, Intermediate cavity 100 is entered by first through hole 242 again；The tonifying Qi component for filling into gas and passing through lower flange 28 from increasing enthalpy component 13 282 enter the inner cavity of lower flange, then are entered intermediate cavity 100 by the second through-hole 283 and be vented with the level-one from middle cylinder 25 mixed It is combined into second level sucking gas, second-compressed is carried out by the sucking of air entry 221 of upper cylinder 22, and form secondary exhaust from upper method The high pressure gas component 211 of orchid 21 is discharged into second level high pressure gas chamber 110, finally by the row of exhausting-gas hole of the cover assembly of compressor 16 Out, into air-conditioning system.

The invention also provides a kind of air conditioners comprising the three cylinder twin-stage positive displacement compressors.

Illustrate performance of the invention by the embodiment of the compressor of three kinds of different displacements below.

As shown in table 1, there are three types of the compressors of different model A, B, C.Wherein, intermediate cavity volume V4 and each discharge capacity meet with Lower relationship: 0.7 >=V1/(V2+V3) >=0.5；1≥V1/V2≥0.8；2.2≥V2/V3≥1.4；5 >=V4/(V2+V3) >=2；7 ≥V4/V1≥4.The efficiency of compressor is shown in Table 2.

Table 1(discharge capacity and intermediate cavity volume unit are cubic centimetre)

As shown in Fig. 2, span L is the eccentric distance for arriving lower bias on crankshaft.Span of the invention is about prior art 0.9 times, the span L of three kinds of model compressors, e.g., 0.9La, 0.9Lb, 0.9Lc, i.e. span reduce.

Table 2

The intermediate cavity of prior art described in table 2 is embedding structure, and compared with the present invention, input power is big, refrigerating capacity Small instead, compressor efficiency is lower.The present invention is set to the external structure between cylinder block and shell using intermediate cavity, shortens song The deformation of eccentric span L above and below axis, crankshaft reduce, and improve the reliability of compressor.Intermediate cavity is external, so that its volume increases Greatly, intermediate cavity pressure oscillation is reduced, so that cylinder and lower cylinder smooth in exhaust in low pressure, high pressure upper cylinder pressure of inspiration(Pi) is flat Surely, level-one overcompression loss is reduced, two-stage compression power consumption is reduced, improves the performance of compressor.Intermediate cavity and upper cylinder second level are inhaled The direct connection of gas shortens the length of middle pressure runner, the loss of suction of runner flow resistance loss and high pressure cylinder is pressed in reduction, makes high pressure Cylinder air-breathing is more smooth, reduces the work done during compression of upper cylinder, improves compressor performance.In being outside cylinder and lower cylinder in low pressure It calms the anger body, pressure difference processed reduces inside and outside cylinder body, and the leakage rate of refrigerant reduces, the refrigerating capacity or heating capacity of compressor are improved, from And improve the performance of refrigeration system.

Above-described embodiment is merely to illustrate a specific embodiment of the invention.It should be pointed out that for the general of this field For logical technical staff, without departing from the inventive concept of the premise, several deformations and variation can also be made, these deformations and Variation all should belong to protection scope of the present invention.

Claims (11)

1. a kind of three cylinder twin-stage positive displacement compressors, including shell, upper flange, upper cylinder on crankshaft, in inner cavity Partition, middle cylinder, lower cylinder and the lower flange with inner cavity, which is characterized in that the upper flange separates the housing cavity At upper and lower two closed chambers, i.e., it is second level high pressure gas chamber on the upside of the described upper flange, and is centre on the downside of the upper flange Chamber；

Gas after the lower cylinder, middle cylinder first compression, alternatively, the gas after the middle cylinder first compression, row Enter the intermediate cavity and with fill into gas mixing after, then the high pressure of second level is discharged into after the upper cylinder second-compressed Air cavity.

2. three cylinders twin-stage positive displacement compressor as described in claim 1, which is characterized in that the intermediate cavity on the downside of the upper flange is Cavity on the downside of upper flange between housing bottom pasta, the volume of the intermediate cavity and the upper cylinder, middle cylinder and lower gas The discharge capacity of cylinder meets following relationship:

0.7 >=V1/(V2+V3) >=0.5；1≥V1/V2≥0.8；2.2≥V2/V3≥1.4；5 >=V4/(V2+V3) >=2；7≥ V4/V1≥4；Wherein:

V1 is the discharge capacity of upper cylinder, V2 is the discharge capacity of middle cylinder, V3 is lower cylinder discharge capacity, and V4 is the volume of intermediate cavity.

3. three cylinders twin-stage positive displacement compressor as described in claim 1, which is characterized in that the upper flange is equipped with the upper gas The high pressure gas component that cylinder is connected to the second level high pressure gas chamber.

4. three cylinders twin-stage positive displacement compressor as described in claim 1, which is characterized in that the upper cylinder, which is equipped with, to be connected in described Between chamber air entry.

5. three cylinders twin-stage positive displacement compressor as described in claim 1, which is characterized in that the inner cavity of the middle partition is equipped with connection The first exhaust component of the middle cylinder with equipped with the first through hole for being connected to the intermediate cavity.

6. three cylinders twin-stage positive displacement compressor as described in claim 1, which is characterized in that be additionally provided on the cylinder body of the lower cylinder The air inlet for filling into gas.

7. three cylinders twin-stage positive displacement compressor as described in claim 1, which is characterized in that the inner cavity of the lower flange is equipped with connection The second exhaust component of the lower cylinder with equipped with the second through-hole for being connected to the intermediate cavity；The inner cavity of the lower flange is additionally provided with With the tonifying Qi component for filling into gas connection.

8. three cylinders twin-stage positive displacement compressor as described in claim 1, which is characterized in that after the middle cylinder first compression Gas is discharged into the intermediate cavity via the inner cavity of the middle partition；Gas after the lower cylinder first compression, via institute The inner cavity for stating lower flange is discharged into the intermediate cavity；The gas that fills into is discharged into the centre via the inner cavity of the lower flange Chamber.

9. three cylinders twin-stage positive displacement compressor as described in claim 1, which is characterized in that the side of the middle partition is equipped with recessed Slot, closed upper spacer is equipped on the groove, which is the inner cavity of the middle partition.

10. three cylinders twin-stage positive displacement compressor as described in claim 1, which is characterized in that the back side of the lower flange is equipped with recessed Slot, closed lower cover plate is equipped on the groove, which is the inner cavity of the lower flange.

11. a kind of air conditioner, which is characterized in that including the described in any item three cylinders twin-stage transfiguration compressions of such as claim 1 ~ 10 Machine.