CN110219803A - Compressor, air conditioner - Google Patents
Compressor, air conditioner Download PDFInfo
- Publication number
- CN110219803A CN110219803A CN201910649897.3A CN201910649897A CN110219803A CN 110219803 A CN110219803 A CN 110219803A CN 201910649897 A CN201910649897 A CN 201910649897A CN 110219803 A CN110219803 A CN 110219803A
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- CN
- China
- Prior art keywords
- compression unit
- compressor
- stage compression
- pressure stage
- pipeline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/008—Hermetic pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
- F04C29/025—Lubrication; Lubricant separation using a lubricant pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
- F04C29/026—Lubricant separation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2210/00—Fluid
- F04C2210/26—Refrigerants with particular properties, e.g. HFC-134a
- F04C2210/261—Carbon dioxide (CO2)
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Compressor (AREA)
Abstract
The present invention provides a kind of compressor, air conditioner.The compressor, including low-pressure stage compression unit, hiigh pressure stage compression unit, the hiigh pressure stage compression unit has first row air cavity, the first row air cavity and oil eliminator perforation connect, there is the oil eliminator oil outlet, the oil outlet and the hiigh pressure stage compression unit to be connected by the perforation of the first pipeline.A kind of compressor according to the present invention, air conditioner, can the moving component in effectively lubricating hiigh pressure stage compression unit rub secondary, the leakage of refrigerant in hiigh pressure stage compression unit is effectively reduced, promotes the volumetric efficiency and reliability of compressor.
Description
Technical field
The invention belongs to compressor manufacturing technical fields, and in particular to a kind of compressor, air conditioner.
Background technique
The CO of mainstream at present2The back pressure form of compressor mainly has middle back pressure and high back pressure both forms, wherein in back
Press the primary structure and working principle of compressor are as follows: after compressor start, the refrigerant of low-temp low-pressure is introduced into low-pressure stage pressure
The refrigerant of medium temperature and medium pressure is drained into enclosure interior after the compression of low-pressure stage compression unit by contracting unit, back pressure in formation, it
After shell is discharged, hiigh pressure stage compression unit is entered after intercooler is cooling, refrigerant is carried out in hiigh pressure stage compression unit
Compressor is discharged after two-stage compression.The bottom of compressor is freezing oil sump, and crankshaft is placed on compressor compresses partial interior, in song
There is oilhole inside axis, oil guide piece is installed in oilhole, the bottom of crankshaft is extend into oil sump.By aforementioned compressor structural principle
It influences, the lubricating system of such compressor is centrifugal fuel feeding, main operational principle are as follows: after compressor start, in centrifugal force
It under the collective effect of oil guide piece, will freeze in the oilhole inside oil pump to crankshaft, then by being connected with oilhole inside crankshaft
Radial direction oil hole, refrigeration oil is transported to the positions such as end face of flange, upper and lower roller end face and inside, slide plate head up and down.It is this
Lubricating system is in the field of business to be used widely, the lubrication form of this mode due to pressure difference effect, to hiigh pressure stage compression unit
Moving component friction lubricating effect it is bad, specifically, the internal refrigeration storage agent pressure due to hiigh pressure stage compression unit wants long-range
In the pumping pressure (pressure at expulsion that can be understood as low-pressure stage compression unit) of lubricating oil, lubricating oil is difficult in centrifugal force
In the lower hiigh pressure stage compression unit for entering higher pressure of effect, thus lead to the lack of lubrication in hiigh pressure stage compression unit, oil sealing
Effect difference leads to leakage of refrigerant, and then reduces the volumetric efficiency and reliability of compressor, is based on this deficiency, proposes this hair
It is bright.
Summary of the invention
It therefore, being capable of effectively lubricating high pressure the technical problem to be solved in the present invention is that providing a kind of compressor, air conditioner
Moving component friction in grade compression unit is secondary, and the leakage of refrigerant in hiigh pressure stage compression unit is effectively reduced, promotes compressor
Volumetric efficiency and reliability.
To solve the above-mentioned problems, the present invention provides a kind of compressor, including low-pressure stage compression unit, hiigh pressure stage compression list
Member, the hiigh pressure stage compression unit have a first row air cavity, and the first row air cavity and the hiigh pressure stage compression unit pass through the
The perforation connection of one pipeline.
Preferably, oil eliminator is provided on first pipeline, the oil eliminator has oil outlet, the oil outlet
It penetrates through and connects with the hiigh pressure stage compression unit.
Preferably, the first regulating valve is provided on first pipeline.
Preferably, lubricating oil cooling-part is additionally provided on first pipeline, the lubricating oil cooling-part is in described
Between oil outlet and first regulating valve.
Preferably, the hiigh pressure stage compression unit includes the first flange being axially successively provided adjacent to along crankshaft, the first cylinder
Body, partition are configured with the first oil inlet pipe on the partition, so that lubricating oil enters in first cylinder body.
Preferably, the first air intake passage, lubricating oil pumping passage, the grease pump are also configured in the first flange
Channel is sent to penetrate through first air intake passage and the lubricating oil bath in the first flange far from first cylinder body side.
Preferably, the oil outlet is also connected with the low-pressure stage compression unit by the perforation of the second pipeline.
Preferably, first pipeline is in parallel with second pipeline, alternatively, second pipeline is series at described first
After pipeline.
Preferably, the second regulating valve is provided on second pipeline.
Preferably, the low-pressure stage compression unit includes the partition being axially successively provided adjacent to along crankshaft, the second cylinder body, the
Two flanges are configured with the second oil inlet pipe in the second flange, so that lubricating oil enters in second cylinder body.
Preferably, the compressor includes shell, and the oil outlet is penetrated through by the inner cavity of third pipeline and the shell
Connection.
Preferably, the compressor is middle back pressure Dual-level enthalpy adding compressor.
The present invention also provides a kind of air conditioners, including above-mentioned compressor.
A kind of compressor provided by the invention, air conditioner, the lubricating oil isolated in the oil eliminator is described first
It is forced into the hiigh pressure stage compression unit under the high pressure effect of discharge chamber, this is effectively prevented in the prior art by institute
The problem of stating lack of lubrication caused by hypertonia bring lubricating oil in hiigh pressure stage compression unit is difficult to enter, makes the high pressure
Moving component friction in grade compression unit secondary (such as the mating surface between roller and first flange or partition, slide plate end
With the contact surface of roller surface etc.) lubrication it is more abundant, the leakage of refrigerant in hiigh pressure stage compression unit is effectively reduced, is promoted
The volumetric efficiency and reliability of compressor.
Detailed description of the invention
Fig. 1 is the structural schematic diagram (principle containing air-conditioning system) of the compressor of the embodiment of the present invention；
Fig. 2 is the schematic perspective view of the second flange in Fig. 1；
Fig. 3 is the schematic perspective view of the partition in Fig. 1；
Fig. 4 is the schematic perspective view of the first flange in Fig. 1；
Fig. 5 is the partial structural diagram of the compressor of another embodiment of the present invention；
Fig. 6 is the partial structural diagram of the compressor of further embodiment of this invention.
Appended drawing reference indicates are as follows:
11, first row air cavity；12, oil eliminator；121, oil outlet；122, gas outlet；21, the first regulating valve；22, second
Regulating valve；23, lubricating oil cooling-part；100, crankshaft；101, first flange；1011, the first air intake passage；1012, lubricating oil
Pumping passage；102, the first cylinder body；103, partition；1031, the first oil inlet pipe；104, lubricating oil bath；105, the second cylinder body；
106, second flange；1061, the second oil inlet pipe；107, shell；1071, level-one exhaust outlet；108, cover board；109, driving group
Part；200, First Heat Exchanger；201, economizer；202, throttle part；203, the second heat exchanger；204, the first air entry；205,
Gas supplementing opening；206, cooling during rolling component.
Specific embodiment
In conjunction with referring to shown in Fig. 1 to 6, according to an embodiment of the invention, a kind of compressor is provided, especially a kind of middle back pressure
Dual-level enthalpy adding compressor, including shell 107, the shell 107 are internally provided with low-pressure stage compression unit, hiigh pressure stage compression list
Member, the low-pressure stage compression unit and hiigh pressure stage compression unit are operated under the action of driving assembly 109 and are realized to refrigerant
(such as CO2) compression, it is to be understood that the low-pressure stage compression unit and hiigh pressure stage compression unit are for twin-stage pressure
The compression unit of low-pressure stage compression unit and hiigh pressure stage is respectively corresponded for contracting machine, more specifically, refrigerant is by described low
It can be again introduced into after compression unit of arbitrarily downgrading compression after the hiigh pressure stage compression unit is compressed and form high temperature and high pressure gas participation
Into air-conditioning system, the hiigh pressure stage compression unit has first row air cavity 11, and the first row air cavity 11 passes through the first pipeline
It penetrates through and connects with the hiigh pressure stage compression unit, so as to introduce the hiigh pressure stage with being mixed with the refriger-ant section of lubricating fluid
Sufficient lubrication is carried out to it in compression unit, more specifically, oil eliminator 12, the oil are provided on first pipeline
There is oil outlet 121 and gas outlet 122 from device 12, wherein the oil outlet 121 and the hiigh pressure stage compression unit pass through first
Pipeline perforation connection, and the gas outlet 122 then penetrates through with the First Heat Exchanger 200 in air-conditioning system and connects.Using the skill
Art scheme, the lubricating oil isolated in the oil eliminator 12 be oppressed under the high pressure effect of the first row air cavity 11 into
Enter the hiigh pressure stage compression unit, this is effectively prevented in the prior art due to hypertonia band in the hiigh pressure stage compression unit
The problem of lack of lubrication caused by the lubricating oil come is difficult to enter, makes the moving component in the hiigh pressure stage compression unit rub secondary
(such as mating surface, slide plate end and contact surface of roller surface between roller and first flange 101 or partition 103 etc.)
It lubricates more abundant, the leakage of refrigerant in hiigh pressure stage compression unit is effectively reduced, promote the volumetric efficiency of compressor and reliable
Property.
A kind of specific embodiment as above-mentioned air-conditioning system is as shown in Figure 1, be configured with level-one row on the shell 107
Port 1071, compressed refrigerant enters cooling during rolling via the level-one exhaust outlet 1071 in the low-pressure stage compression unit
Component 206 carries out after cooling down through entering the hiigh pressure stage by the first air intake passage 1011 (a specifically such as individual air intake duct)
Compression unit is compressed again, and the refrigerant of final high temperature and pressure enters the oil eliminator via the first row air cavity 11
12, entering the First Heat Exchanger 200 via gas outlet 122 by isolated gaseous refrigerant (is room such as under refrigerating state
External condenser), enter economizer 201 later, refrigerant is divided into two-way, wherein refrigerant all the way enters via gas supplementing opening 205
In the shell 107, realizes and the Gas-supplying enthalpy-increasing of compressor is acted on；Another way then via the reducing pressure by regulating flow of throttle part 202 after
It flows into the second heat exchanger 203 (corresponding to evaporator) to freeze, finally enters the low-pressure stage pressure via the first air entry 204
Contracting unit, to realize the refrigeration cycle of air-conditioning system.
In order to carry out controllable adjustment to the lubricating oil for entering the hiigh pressure stage compression unit, it is preferable that described first
The first regulating valve 21 is provided on pipeline, it is to be appreciated that first regulating valve 21 is to the lubricating oil in first pipeline
The adjusting of pressure, while its flow that necessarily can also adjust lubricating oil in first pipeline are carried out, specifically for example, it can
To be realized using pressure-regulating valve, naturally it is also possible to be realized by flow control valve.Further, it is also set on first pipeline
Have a lubricating oil cooling-part 23, the lubricating oil cooling-part 23 be in the oil outlet 121 and first regulating valve 21 it
Between, the lubricating oil cooling-part 23 can cool down the profit in first pipeline for example, by using usual oil cooler
Lubricating oil prevents the adverse effect of lubricating oil high-temp coking or the sealing element to pipeline and compressor relevant portion.
The hiigh pressure stage compression unit includes along the axial first flange 101 being successively provided adjacent to of crankshaft 100, the first cylinder body
102, partition 103 are configured with the first oil inlet pipe 1031 on the partition 103, so that lubricating oil enters first cylinder body 102
It is interior, it has been merely given as a kind of specific pattern of a kind of first pipeline and hiigh pressure stage compression unit perforation herein, the
One oil inlet pipe 1031 can also be arranged in certainly on first cylinder body 102 or in first flange 101, and the present invention does not make
It is particularly limited to, further, first oil inlet pipe 1031 has radial passage and axial duct, the radial passage and institute
The first piping connection is stated, and the axial duct is then penetrated through with the hiigh pressure stage compression unit.
In order to further ensure the lubricant effect to the hiigh pressure stage compression unit, further, the first flange 101
On be also configured with the first air intake passage 1011, lubricating oil pumping passage 1012, the lubricating oil pumping passage 1012 penetrates through described
First air intake passage 1011 and lubricating oil bath 104 in the first flange 101 far from 102 side of the first cylinder body,
This mode is particularly suitable for the compressor of middle back pressure, specifically, the lubricating oil bath 104 is in the shell 107, and institute
The exhaust for stating low-pressure stage compression unit will initially enter in shell 107, in this way, the pressure of the lubricating oil bath 104 is equal to described
The pressure at expulsion of low-pressure stage compression unit, and the pressure of refrigerant is then due in the centre in first air intake passage 1011
The pressure at expulsion of the low-pressure stage compression unit it has been lower than under the action of cooling-part 206 to a certain extent, therefore, in pressure difference
Under the action of, the lubricating oil is pumped in first air intake passage 1011 via the lubricating oil pumping passage 1012
And as refrigerant enters the hiigh pressure stage compression unit, high-efficiency lubricating, further, first air intake passage 1011 are realized
The refrigerant at place flow velocity under the action of the hiigh pressure stage compression unit is fast, and the refrigerant of high flow rate will be pumped in the lubricating oil
The exit in channel 1012 generates vacuum degree, and under the action of this vacuum degree, the lubricating oil in lubricating oil bath 104 will be also forced into
In first air intake passage 1011.
The hiigh pressure stage compression unit can also include cover board 108, and the cover board 108 is covered in the first flange 101
Towards the side of the lubricating oil bath 104, at this point, as a kind of enforceable mode, on the cover board 108 with the lubricating oil
Pumping passage 1012 is configured with corresponding channel on corresponding position, to guarantee the normal pumping of lubricating oil.
The oil outlet 121 can also be connected with the low-pressure stage compression unit by the perforation of the second pipeline.That is, described
The lubricating oil isolated in oil eliminator 12 can also be transported in the low-pressure stage compression unit and be lubricated.Song at this time
Axis 100 can guarantee the low-pressure stage compression without the corresponding axial input oil groove of processing or circumferential input oil groove and oil guide piece
The sufficient lubrication of unit and hiigh pressure stage compression unit, this is undoubtedly capable of the difficulty of processing of the reduction crankshaft of high degree.
Preferably, first pipeline is in parallel with second pipeline, alternatively, second pipeline is series at described first
After pipeline namely lubricating oil that the oil eliminator 12 is separated can be simultaneously via first pipeline, the second pipeline
Specific aim oil transportation lubrication is carried out to hiigh pressure stage compression unit, low-pressure stage compression unit respectively, lubricating oil can also be made first to flow through the
The second pipeline is again flowed through after one pipeline realizes oil transportation lubrication.Best, the second regulating valve 22 is provided on second pipeline,
Second regulating valve 22 can be consistent or inconsistent with first regulating valve 21.
Preferably, the low-pressure stage compression unit includes along the axial partition 103, second being successively provided adjacent to of crankshaft 100
Cylinder body 105, second flange 106 are configured with the second oil inlet pipe 1061 in the second flange 106, so that lubricating oil enters institute
State in the second cylinder body 105, it is to be understood that the low-pressure stage compression unit and the hiigh pressure stage compression unit share it is described every
Plate 103, to realize the structurally reasonable of the compressor.
It is connected as shown in fig. 6, the oil outlet 121 can also be penetrated through by the inner cavity of third pipeline and the shell 107,
It can guarantee that the lubricating oil separated in the oil eliminator 12 is back in time in the shell 107 at this time.
First regulating valve 21 above-mentioned, the second regulating valve 22 can be by first pipeline or the second pipelines, third pipe
The pressure of lubricating oil in road is adjusted to the pressure of a little higher than object space, lubrication caused by capable of preventing pressure difference excessive in this way
The problem of oil mass much refrigerant volume for occupying compression unit.The adjustment of aforementioned pressure can be by selecting electrohydraulic pressure control valve
Or flow valve is realized, control signal then derives from corresponding pressure sensor, such as the confession to low-pressure stage compression unit
Oil pressure general control is 0.1 to 0.3Mpa.Furthermore it is also possible to simultaneously or separately control first regulating valve 21, second
The aperture of regulating valve 22.
The present invention also provides a kind of air conditioners, including above-mentioned compressor.
Those skilled in the art will readily recognize that above-mentioned each advantageous manner can be free under the premise of not conflicting
Ground combination, superposition.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all in spirit of the invention and
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within principle.Above only
It is the preferred embodiment of the present invention, it is noted that for those skilled in the art, do not departing from this hair
Under the premise of bright technical principle, several improvements and modifications can also be made, these improvements and modifications also should be regarded as guarantor of the invention
Protect range.
Claims (13)
1. a kind of compressor, which is characterized in that including low-pressure stage compression unit, hiigh pressure stage compression unit, the hiigh pressure stage compression
Unit has first row air cavity (11), and the first row air cavity (11) and the hiigh pressure stage compression unit are penetrated through by the first pipeline
Connection.
2. compressor according to claim 1, which is characterized in that oil eliminator (12) are provided on first pipeline,
The oil eliminator (12) has oil outlet (121), and the oil outlet (121) and hiigh pressure stage compression unit perforation connect.
3. compressor according to claim 2, which is characterized in that be provided with the first regulating valve on first pipeline
(21)。
4. compressor according to claim 3, which is characterized in that be additionally provided with lubricating oil cooling-part on first pipeline
(23), the lubricating oil cooling-part (23) is between the oil outlet (121) and first regulating valve (21).
5. compressor according to claim 1, which is characterized in that the hiigh pressure stage compression unit includes along crankshaft (100)
The axial first flange (101) being successively provided adjacent to, the first cylinder body (102), partition (103) are configured on the partition (103)
First oil inlet pipe (1031), so that lubricating oil enters in first cylinder body (102).
6. compressor according to claim 5, which is characterized in that be also configured with the first suction on the first flange (101)
Gas channel (1011), lubricating oil pumping passage (1012), it is logical that the lubricating oil pumping passage (1012) penetrates through first air-breathing
Road (1011) and the lubricating oil bath (104) for being in the first flange (101) separate first cylinder body (102) side.
7. the compressor according to any one of claim 2 to 6, which is characterized in that the oil outlet (121) also with it is described
Low-pressure stage compression unit passes through the perforation connection of the second pipeline.
8. compressor according to claim 7, which is characterized in that first pipeline is in parallel with second pipeline, or
Person, second pipeline are series at after first pipeline.
9. compressor according to claim 8, which is characterized in that be provided with the second regulating valve on second pipeline
(22)。
10. compressor according to claim 7, which is characterized in that the low-pressure stage compression unit includes along crankshaft (100)
Axial partition (103), the second cylinder body (105), second flange (106) being successively provided adjacent to, structure on the second flange (106)
The second oil inlet pipe (1061) are made, so that lubricating oil enters in second cylinder body (105).
11. compressor according to claim 2, which is characterized in that the compressor includes shell (107), described fuel-displaced
Mouth (121) is penetrated through by the inner cavity of third pipeline and the shell (107) and is connected.
12. compressor according to claim 1, which is characterized in that the compressor is middle back pressure Dual-level enthalpy adding compressor.
13. a kind of air conditioner, including compressor, which is characterized in that the compressor is described in any one of claims 1 to 12
Compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910649897.3A CN110219803A (en) | 2019-07-18 | 2019-07-18 | Compressor, air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910649897.3A CN110219803A (en) | 2019-07-18 | 2019-07-18 | Compressor, air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110219803A true CN110219803A (en) | 2019-09-10 |
Family
ID=67813604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910649897.3A Pending CN110219803A (en) | 2019-07-18 | 2019-07-18 | Compressor, air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110219803A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111577601A (en) * | 2020-05-27 | 2020-08-25 | 广东美芝精密制造有限公司 | Compressor and refrigerating system with same |
| CN115217760A (en) * | 2021-10-15 | 2022-10-21 | 广州市德善数控科技有限公司 | Low pressure chamber rotary compressor and air conditioner |
-
2019
- 2019-07-18 CN CN201910649897.3A patent/CN110219803A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111577601A (en) * | 2020-05-27 | 2020-08-25 | 广东美芝精密制造有限公司 | Compressor and refrigerating system with same |
| CN115217760A (en) * | 2021-10-15 | 2022-10-21 | 广州市德善数控科技有限公司 | Low pressure chamber rotary compressor and air conditioner |
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