CN1308188A - Multi-stage blow-down valve for compressor system - Google Patents
Multi-stage blow-down valve for compressor system Download PDFInfo
- Publication number
- CN1308188A CN1308188A CN 00128191 CN00128191A CN1308188A CN 1308188 A CN1308188 A CN 1308188A CN 00128191 CN00128191 CN 00128191 CN 00128191 A CN00128191 A CN 00128191A CN 1308188 A CN1308188 A CN 1308188A
- Authority
- CN
- China
- Prior art keywords
- compressor
- pressure
- valve
- links
- import
- 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.)
- Pending
Links
Images
Landscapes
- Compressor (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
A multi-stage blowdown valve is provided that uses a single control signal to simultaneously decompress the interstage and the second stage in a compressor system. The valve uses a series of sliding spools located linearly within a single bore to either prevent or allow fluid communication between two isolated passageways each having an inlet port and a discharge port. The valve, when used as a two stage blowdown valve in a multi-stage compressor system, can prevent compressor failure from occurring by ensuring that both the interstage and the second stages are decompressed, not only the interstage.
Description
The application is people such as Centers in application on October 27th, 1998 and the sequence number owned together is 09/179, the part renewal application of 523 U.S. Patent application, described 09/179,523 U.S. Patent application is people such as Centers in application on October 28th, 1997 and the sequence number owned together is 60/066, the part renewal application of 008 U.S. Provisional Patent Application, these two the disclosed contents of application all are included in this article as a reference.
Present invention relates in general to a kind of control valve.Particularly relate to a kind of control valve that uses with compressor.Again specifically, the present invention relates to a kind of outlet valve that uses with one or more no oily two-stage screw formula compressors.
When compressor during, if the interior level (interstage) and second level release of pressure all then can obviously reduce the power consumption of two-stage dry type (not having oily) screw compressor in non-loaded down operation.But, two-stage all carried out the problem that release of pressure brought be, if second level outlet valve breaks down, then in the level outlet valve internally level carry out release of pressure and produce bigger pressure reduction in the second level.This bigger pressure reduction can make partial temperature raise, and may cause compressor failure.
Compressor is in the past avoided the problems referred to above by only all discharging with partial pressure release rather than with two stage pressures.But it is big when all discharging than two-stage that the shortcoming that only discharges second level pressure when the compressor running light is the power consumption of compressor.
Compressor valve device in the past can not solve the problem of simultaneously two isolation levels being carried out release of pressure fully.The U. S. Patent 3,260,444 of Williams discloses control valve unit 104 and 110, and they are also worked in an identical manner by same guide line 158 controls.For valve 104, for example, guide line 158 can mobile piston 130, is to be communicated with pipeline 113 or to be communicated with pipeline 102 with controlling plumbing fixtures 106.Adopt these valves as the shortcoming of the outlet valve of two stage compressor to be: if a valve breaks down, then another valve may still work on, and this may cause compressor failure.
Therefore, wish to have a kind of reliable apparatus that is used for two-stage dry-type spiral compressor, carry out release of pressure with an internal level outlet valve when second level outlet valve starts.
Therefore, main purpose of the present invention provides a kind of outlet valve that is used for the two-stage of multistage compressor, makes this valve internal reliably level to carry out release of pressure when the release of pressure of the second level.
Purpose of the present invention is realized that by following outlet valve this valve adopts an independent control signal with internal level release of pressure in the release of pressure of the second level.This valve adopts a series of sliding valve cores that are positioned at single hole and are in line and arrange, and is communicated with to prevent that two fluids between the channel isolation are communicated with or make it, and described two channel isolations all have an import and an exhaust port.This valve can be reliably as the two-stage outlet valve in the multistage compressor system.
Figure 1A and 1B all represent the isometric cross-sectional view of multi-stage blow-down valve of the present invention, and wherein, valve lays respectively at closed position and open position.
Fig. 2 A and 2B all represent second embodiment's of multi-stage blow-down valve of the present invention isometric cross-sectional view, and wherein, valve lays respectively at closed position and open position.
Fig. 3 A and 3B are respectively the elevational cross-sectional view and the side view cutaway drawings of valve shown in Fig. 2 A.
Fig. 4 is the schematic representation that the multi-stage blow-down valve shown in expression Figure 1A and the 1B is used for compressor assembly.
Fig. 5 is the partial exploded view that has adopted the improvement of the Figure 1A and the compressor assembly shown in Figure 3 of multi-stage blow-down valve shown in the 1B to be connected.
Figure 1A and 1B have represented the preferred embodiment of multi-stage blow-down valve 50 of the present invention.Referring to these accompanying drawings, multi-stage blow-down valve 50 has 26,30 and two exhaust ports 28,32 of two imports.When valve 50 was positioned at closed position shown in Figure 1A, all mouths 26,28,30 and 32 were all isolated and circulating liquid not mutually.When valve 50 ' when being positioned at the open position shown in Figure 1B, import 26 only is communicated with exhaust port 28 fluids, and import 30 only is communicated with exhaust port 32 fluids.Clearly, valve 50 can make import 26,30 as exhaust port, and exhaust port 28,32 be as import with reverse operation.
Multi-stage blow-down valve 50 has a main aperture 68, and this hole can have single diameter, but preferably have three diameters 68 ', 68 ", 68 ." fluid that helps more volumes passes valve and has prolonged and encircles for 36 life-span bigger diameter 68.Therefore, for example when spool back and forth passes hole 14, repeat to contact with the edge of import 26 by avoiding, the life-span of the ring 36 on the spool 17 has prolonged.Less diameter 68 can help spring 24 centering in hole 68.
A plurality of spools 60,62 and 64 are arranged in the hole 68, they in the hole as the crow flies mutually against.Spool 60 and 64 all has a supporting leg part 42 that is connected by two heads 40.Spool 62 has a head 40 that is connected by two supporting leg parts 42.Contiguous spool is preferably by adopting tongue-and-groove to link to each other with joint tongue.For example, each supporting leg part 42 of spool 62 can have a joint tongue 44, is used for being assembled in the tongue-and-groove 46 of head of adjacent spool 60 and 64.
Each head 40 preferably also has one or more rubber rings 36 that are inserted in the respective annular grooves in the head, makes spool in the hole when mobile, each spool all with hole 14 airtight contacts.The ring that is used as the optimised form of the ring 36 on the spool 16-20 or 60,62 and 64 refers to V-ring or U-loop sometimes, promptly refers to when ring places the hole to fold.The beneficial characteristics of puckered ring design comprises: can reduce adhesion when spool moves in hole 14; Reduced sliding force, it makes, and control force is low also can be repeated; Improved the sealability of the ring that under pressure, launches; Improved the life-span, during this period, even the part ring has worn and torn, all desired properties of puckered ring still can keep.When the different diameter parts of spool in the hole moved, for example, from diameter 14 ' to 14 " or 68 ' to 68 " and when returning, the design form of above-mentioned puckered ring also provided reliable operation again.
Fig. 2 A, 2B, 3A and 3B represented multi-stage blow-down valve 10 of the present invention and 10 ' another embodiment.Fig. 2 B has represented outlet valve 10 ' be shown in an open position, and Fig. 2 A, 3A and 3B have represented that outlet valve 10 is in the closed position.Multi-stage blow-down valve 10 is different with multi-stage blow-down valve 50 substantially, and difference is that it has the spool 16-20 of different structure and is not having less hole near pressure spring 24 places.Form as an alternative, multi-stage blow-down valve 10 have one have two diameter parts 14 ' and 14 " main aperture 14.
Referring to Fig. 2 A, 2B, 3A and 3B, have a plurality of spool 16-20 in the hole 14, they in the hole as the crow flies mutually against.Each spool 16-20 has a supporting leg part 42 and a head 40.Adjacent spool is preferably by adopting tongue-and-groove to link to each other with joint tongue.For example, each head 40 of each spool 16-20 all can have a tongue-and-groove 46, is used for holding adjacent spool leg section with assembling and divides joint tongue 44 on 42.
Although the present invention has adopted a plurality of spools that are positioned at the hole, also can adopt single spool to realize identical functions.But, preferably adopt a plurality of independent spool 16-20 or 62,62 and 64, because they can form better sealing by having an effect with the internal pressure of pilot pressure and import generation.But, preferably adopt the spool 62,62 and 64 shown in Figure 1A and the 1B, because compare with the spool 16-20 of Fig. 2 A and structure shown in the 2B, during spool moved, its linearity deviation can be littler.
For a person skilled in the art, clearly, although valve described herein is used for two stage compressor, this valve also is applicable to three grades or multistage compressor.In order to form multi-stage blow-down valve, valve described here only needs longer hole, additional spool and extra import and exhaust port.
Fig. 3 and Fig. 4 have represented the multi-stage blow-down valve with 1002 uses of two stage compressor system.Two stage compressor system 1002 described here more clearly is described in 09/179,523 the U.S. Patent application.Multi-stage blow-down valve 10 serves many purposes and can use with multiple compressor assembly.Therefore, should be appreciated that compressor assembly 1002 described herein only is an example, is not determinate.
Now the working method of compressor assembly 1002 will be described briefly.Referring to Fig. 3, first order compressor 102 arrives about 30psi with air compression.Level pipeline 104 in pressurized air is sent to from first order compressor 102.Level cooler 106 in pressurized air flows into by pipeline 104.The air temperature that makes cooler 106 reduces about 300 Fahrenheits (300).Cooler 106 links to each other with the exhaust port of first order compressor 102 by a connecting plate 108.
Level cooler 106 was sent to level pipeline 112 in another in pressurized air passed.Pipeline 112 links to each other with a dehydrating breather 110 by connecting plate 108A.Dehydrating breather 110 links to each other with interior level pipeline, and this pipeline is directed to high stage compressor 114 by interior level pipe 116, and described interior level pipe 116 also links to each other with dehydrating breather 110 by connecting plate 108B.
Described pressurized air is sent to the import of high stage compressor 114.High stage compressor 102 recompresses about 70psi with air, and this just makes air compression arrive about 100psi.Pressurized air is sent to high stage compressor discharge conduit 118 from high stage compressor 114.Pipeline 118 links to each other with another discharge conduit 118A, and described discharge conduit 118A is connected to the discharge cooler 120 of compressor equipment.Cooler 120 makes the compressed-air actuated temperature by wherein reduce about 300 Fahrenheits (300) again.
An interior level pipe 116 has welding bung 150 thereon, and it is connected to interior level pipe 116 in the import 26 of multi-stage blow-down valve 10.Thisly form with being connected of import 26 by bend pipe 151, pipe coupling 152, pipe connection 153 and pipe coupling 154.Baffler 450 is installed on the exhaust port 28 of outlet valve 10.The effect of baffler 450 is to reduce issuable noise when the gas pressure of collecting is discharged into the atmosphere.
Discharge conduit 130B is installed on the dehydrating breather 126, and this pipeline has a T shape bung 170A who is welded on it, and assembling type temperature probe 2010 is arranged in pipeline.The end of T shape bung 170A links to each other with the end of bend pipe 128A.The other end of bend pipe 128A links to each other with discharge conduit 130A.A pipe coupling 171 links to each other with the other end of bung 170A, and it is screwed on the link 172, and this link links to each other with pipe coupling 173 again.The import 30 of multi-stage blow-down valve 10 links to each other with pipe coupling 173.The exhaust port 28 of valve 10 has a muffler 440 that is operably connected on it.Baffler 440 has reduced the noise of generation when the gas pressure of collecting is discharged into the atmosphere.
When two stage compressor 1002 cuts out or unloads, multi-stage blow-down valve 10 of the present invention will be discharged the pressure of all collections, and these pressure may accumulate in the interior level pipe 116, and may and accumulate in the discharge conduit 120 from high stage compressor 114.Because interior level and second level outlet valve integrate, so the interior level and the second level will the while releases of pressure.Therefore, if second level outlet valve breaks down and can not open, a then interior level outlet valve can not opened yet, thereby has avoided the contingent inefficacy of compressor.
In order to use, also need compressor assembly 1002 is done other improvement with multi-stage blow-down valve 10 of the present invention.Originally the bend pipe 180 that was installed on the dehydrating breather 126 to be installed to reciprocal a detection on the valve 492 now.A side that back and forth detects valve 492 is connected on the dehydrating breather 126 by pipe assembly parts 494.The opposite side that back and forth detects valve 492 is connected on the bend pipe 490, and described bend pipe 490 is connected on the pipe 488.The other end of pipe 488 is connected with an elbow 480, and described elbow 480 links to each other with first end of pipe T junction 460.In the past, pipe assembly parts 190 were operably connected to and detected on the valve 128, but now then linked to each other with second end of pipe T junction 460.The 3rd end of pipe T junction 460 links to each other with detection valve 128A by pipe assembly parts 470.
In normal work period, one of advantage of the low pressure ratio of maintenance process high stage compressor is the operating temperature that can reduce in the high stage compressor.Double detection of letting out scheme is shown during normal periodic duty, the standard excretory system makes high stage compressor discharge gas to have temperature up to 360 Fahrenheits.In identical periodic duty, the maximum temperature that the double system of letting out makes high stage compressor discharge gas reaches 295 Fahrenheits.In this experiment, the double system of letting out is than modular system temperature low 22%.This owing to the lower operating temperature that adopts double air valve 10,50 to obtain can make the life-span of compressor longer.
Should be understood that above-mentioned explanation only is illustrative and nonrestrictive, for a person skilled in the art, under the situation that does not break away from spirit of the present invention, can make tangible improvement.Therefore, should mainly determine scope of the present invention referring to this paper appended claim rather than above-mentioned specification.
Claims (20)
1. valve by the single control signal control of compressor assembly, described valve comprises:
A hole;
A plurality of spools that are positioned at the hole as the crow flies, when control signal was in first state, described a plurality of spools had primary importance, and when control signal was in second state, described a plurality of spools had the second place;
The spring assembly that is used for the described a plurality of spools of bias voltage;
First import, when control signal is in second state, it and one first exhaust port fluid communication, when control signal is in first state, first import and the first exhaust port fluid isolation; With
Second import, when control signal is in second state, it and one second exhaust port fluid communication, when control signal is in first state, second import and the second exhaust port fluid isolation;
Wherein, first import and first exhaust port and second import and second exhaust port fluid isolation all.
2. valve as claimed in claim 1 is characterized in that described control signal comprises air pressure.
3. valve as claimed in claim 1 is characterized in that, described spring assembly comprises a pressure spring, and wherein, first and second states of described control signal comprise lowpressure and highpressure respectively, and pressure spring is pressed in primary importance with described a plurality of spools.
4. valve as claimed in claim 1 is characterized in that, described spring assembly comprises an extension spring, and wherein, first and second states of described control signal comprise highpressure and lowpressure respectively, and extension spring is biased to the second place with described a plurality of spools.
5. valve as claimed in claim 1 is characterized in that, each all passes through to adopt tongue-and-groove with joint tongue and linear linking to each other to adjacent spool.
6. valve as claimed in claim 1 also comprises a two stage compressor system that does not have oil, and this system has an interior stage compressor and a high stage compressor, and wherein said valve links to each other with compressor assembly.
7. valve as claimed in claim 6 also comprises:
First baffler that links to each other with first exhaust port; And
Second baffler that links to each other with second exhaust port;
Wherein, first import effectively links to each other with interior stage compressor, and second import effectively links to each other with high stage compressor.
8. an origin is from the outlet valve of the single air pressure signal control of compressor assembly, and described compressor assembly has an interior stage compressor and a high stage compressor, and wherein air pressure signal can be low pressure or high pressure, and described valve comprises:
A hole;
A plurality of spools that are positioned at the hole as the crow flies, when air pressure signal was low pressure, described a plurality of spools had primary importance, and when air pressure signal was high pressure, described a plurality of spools had the second place;
A pressure spring that is used for described a plurality of spools are pressed in closed position;
One first import, when air pressure signal is high pressure, it and one first exhaust port fluid communication, when air pressure signal is low pressure, first import and the first exhaust port fluid isolation;
One second import, when air pressure signal is high pressure, it and one second exhaust port fluid communication, when air pressure signal is low pressure, second import and the second exhaust port fluid isolation;
First baffler that links to each other with first exhaust port; And
Second baffler that links to each other with second exhaust port;
Wherein first import effectively links to each other with interior stage compressor, and second import effectively links to each other with high stage compressor;
Wherein, first import and first exhaust port and second import and second exhaust port fluid isolation all.
9. outlet valve as claimed in claim 8 is characterized in that, each all passes through to adopt tongue-and-groove with joint tongue and linear linking to each other to adjacent spool.
10. one kind is used for electronic control system single or the no oily two stage compressor equipment of a cover, it operationally links to each other with a pressure system, pressure in the described pressure system will remain in the pressure range of an expectation, be used to control the operation of a described single or cover compressor equipment, described system comprises:
Measuring device, it operationally links to each other with first and second compressor stages, is used to measure the pressure of discharging from first and second compressor stages;
Treatment device, it operationally links to each other with measuring device, is used to receive the signal from measuring device, and will make comparisons from first compressor stage and second compressor stage mensuration pressure of discharging and the viable pressure scope of being scheduled to;
Device, it operationally links to each other with treatment device with no oily two stage compressor equipment, is used for close compressor equipment before compressor equipment is damaged;
A valve is used for discharging simultaneously the pressure from first and second compressor stages, and described valve is controlled by single control signal.
11. system as claimed in claim 10 is characterized in that, if the air pressure of discharging from first and second compressor stages is higher than the prespecified range of viable pressure, control system is equipped close compressor.
12. system as claimed in claim 11, it is characterized in that, determine from the air pressure of first and second compressor stages discharge by calculating a numerical value, this numerical value obtains by measuring high stage compressor head pressure and first order compressor discharge pressure, make in during about 3 seconds, effectively high stage compressor head pressure and the ratio of effective first order compressor discharge pressure were greater than 3.5 o'clock, and alarm buzzer is reported to the police and control system close compressor equipment.
13. system as claimed in claim 10 also comprises:
Measuring device, it operationally links to each other with first and second compressor stages, be used to measure the gas temperature of discharging from first and second compressor stages, wherein, treatment device will be made comparisons from first compressor stage and second compressor stage mensuration temperature of discharging and the temperature extremes of being scheduled to;
Device, it operationally links to each other with treatment device with no oily two stage compressor equipment, is used for when discharge temperature surpasses this predetermined temperature close compressor equipment before compressor equipment is damaged.
14. system as claimed in claim 13 is characterized in that, the predetermined temperature limit of the gas of discharging from first compressor stage and second compressor stage approximately is set to 435 Fahrenheits (435).
15. system as claimed in claim 13 is characterized in that, the predetermined temperature limit and the compressor equipment discharge temperature that enter the air of high stage compressor are set in about about 120 Fahrenheits (120).
16. system as claimed in claim 13 is characterized in that, behind close compressor equipment, control system notes which is the main cause of close compressor equipment in the four measuring temperature value, and notes it and when close with the date.
17. system as claimed in claim 10 also comprises:
At least one cooling unit, it operationally between first order compressor and high stage compressor, is used for cooled gas before gas enters high stage compressor;
At least one second cooling unit, it operationally between high stage compressor outlet and compressor equipment outlet, is used for cooled gas before gas enters terminal use's gas system;
Device, it operationally links to each other with each cooling unit, is used to from the gas temperature of each cooling unit discharge and sets up a predetermined high temperature limit;
Measuring device, it operationally links to each other with each cooling unit, is used to measure the gas temperature of discharging from each cooling unit;
Device, it operationally links to each other with treatment device with each measuring device, is used for when discharge temperature surpasses predetermined high temperature limit closes compression machine equipment before compressor apparatus damages.
18. system as claimed in claim 10 also comprises:
Lubrication oil storage, it operationally is positioned at first order compressor and high stage compressor, is used for lubricated parts of isolating with each compressor compresses chamber;
Measuring device, it operationally links to each other with each lubrication oil storage, is used to measure its oil pressure;
Device, it operationally links to each other with measuring device with each lubrication oil storage and links to each other with treatment device, is used to set up the operating range of oil pressure; With
Device, it operationally links to each other with treatment device with each measuring device, is used for when oil pressure departs from predetermined oil pressure scope, and close compressor is equipped before the equipment damage.
19. system as claimed in claim 10 also comprises:
Device, it operationally links to each other with treatment device, is used to measure the air pressure of discharging from compressor equipment after the cooling unit of the second level;
Device, it operationally links to each other with treatment device, is used to measure the gas temperature of discharging from compressor equipment after the cooling unit of the second level;
Device, it operationally links to each other with treatment device, is used for determining the scope of compressor equipment discharge temperature and pressure; And
Device, it operationally links to each other with manometer with the equipment discharge temperature, be used for when temperature or pressure during above preset limit close compressor equip.
20. system as claimed in claim 19 is characterized in that, the equipment head pressure is used to determine when two compressor stages is unloaded and load.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/422,284 US6283716B1 (en) | 1997-10-28 | 1999-10-21 | Multistage blowdown valve for a compressor system |
| US09/422,284 | 1999-10-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1308188A true CN1308188A (en) | 2001-08-15 |
Family
ID=23674188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00128191 Pending CN1308188A (en) | 1999-10-21 | 2000-10-20 | Multi-stage blow-down valve for compressor system |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN1308188A (en) |
| CA (1) | CA2323389A1 (en) |
| MX (1) | MXPA00010091A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112360814A (en) * | 2020-10-09 | 2021-02-12 | 江苏大学 | Stomach type suction tube non-uniform inflow active control device and pump |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011089089B4 (en) * | 2011-12-19 | 2017-11-02 | Thyssenkrupp Marine Systems Gmbh | Device for soundproofing |
-
2000
- 2000-10-16 MX MXPA00010091 patent/MXPA00010091A/en active IP Right Grant
- 2000-10-17 CA CA 2323389 patent/CA2323389A1/en not_active Abandoned
- 2000-10-20 CN CN 00128191 patent/CN1308188A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112360814A (en) * | 2020-10-09 | 2021-02-12 | 江苏大学 | Stomach type suction tube non-uniform inflow active control device and pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2323389A1 (en) | 2001-04-21 |
| MXPA00010091A (en) | 2002-04-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20100163765A1 (en) | Pneumatic valve actuator having integral status indication | |
| US20130233165A1 (en) | Monitoring system for reciprocating pumps | |
| CN110331965B (en) | Continuous circulation supercharging gas production equipment | |
| CN110793860A (en) | High-pressure hydrogen testing system and method | |
| MY123318A (en) | Compressor arrangement | |
| US20030019211A1 (en) | Hydraulic pressure booster cylinder | |
| US6190136B1 (en) | Diaphragm failure sensing apparatus and diaphragm pumps incorporating same | |
| US20100054958A1 (en) | Oil-free air compressor system with inlet throttle | |
| CN1308188A (en) | Multi-stage blow-down valve for compressor system | |
| US4596267A (en) | Piston-driven valves | |
| CN114576132A (en) | Compressed air booster | |
| US6371731B2 (en) | Multistage blowdown valve for a compressor system | |
| CN108591023B (en) | Supercharging system of oilless mute ultrahigh pressure inflator pump | |
| EP1126202A3 (en) | Valve assembly for gas cylinder | |
| CN1734105A (en) | Manually operated piloted control-reliable lockout valve | |
| CN1682061A (en) | Pipe coupling | |
| CN208169656U (en) | A kind of pneumatic valve device | |
| CN1174293A (en) | Double diaphragm pump | |
| US5674055A (en) | Piston sealing arrangement for a sampling pump system | |
| GB2613287A (en) | Configurable fluid compression apparatus, control, and associated methods | |
| US20210164499A1 (en) | Cylinder device | |
| CN1839285A (en) | Vacuum device | |
| CN219034952U (en) | Gas compression device and compressor unit | |
| US20230417239A1 (en) | Method and apparatus for recovery of leaking gases from compression and regulation systems | |
| CN217300804U (en) | Compressed air booster |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| AD01 | Patent right deemed abandoned | ||
| C20 | Patent right or utility model deemed to be abandoned or is abandoned |