CN101315235A - Valve core replaceable carbon dioxide refrigerating system throttling valve - Google Patents
Valve core replaceable carbon dioxide refrigerating system throttling valve Download PDFInfo
- Publication number
- CN101315235A CN101315235A CNA2008100407101A CN200810040710A CN101315235A CN 101315235 A CN101315235 A CN 101315235A CN A2008100407101 A CNA2008100407101 A CN A2008100407101A CN 200810040710 A CN200810040710 A CN 200810040710A CN 101315235 A CN101315235 A CN 101315235A
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- China
- Prior art keywords
- valve
- driver plate
- inlet channel
- valve seat
- channel member
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/36—Expansion valves with the valve member being actuated by bimetal elements or shape-memory elements influenced by fluids, e.g. by the refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2309/00—Gas cycle refrigeration machines
- F25B2309/06—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide
- F25B2309/061—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide with cycle highest pressure above the supercritical pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
- F25B2341/06—Details of flow restrictors or expansion valves
- F25B2341/063—Feed forward expansion valves
Abstract
A throttle valve with a renewable valve core is used for a carbon dioxide refrigeration system, and belongs to the refrigeration technology field. The throttle valve comprises a sleeve, a valve seat, a valve port, a valve needle, a drive plate, a shape memory spring, a drive plate connection rod, an inlet channel member, an inlet channel, a center hole, a ring-shaped groove, an inlet cavity, an outlet tube joint, an inlet tube, an outlet tube and a sealing block. The valve seat is press-mounted on the inner wall surface at the left end of the sleeve, and the left end of the valve seat is in threaded connection with the outlet tube joint; the right end of the sleeve is welded with the inlet tube; the valve port is positioned in the center of the valve seat; the inlet cavity communicates with the inlet tube via the inlet channel on the inlet channel member in a conductive manner; the shape memory spring is arranged in the center hole at the right end of the inlet channel member; the left end of the shape memory spring is in contact with the drive plate connection rod; and the drive plate connection rod is fixed in the center of the right lateral surface of the drive plate with the valve needle arranged on the left side. According to the different outlet temperatures of a gas cooler, the throttle valve can automatically regulate the pressure in the gas cooler to achieve the optimal pressure, and allow the energy efficiency ratio of the system operation to achieve the peak value.
Description
Technical field
The present invention relates to a kind of refrigeration system restricting element, specifically a kind of carbon dioxide refrigerating system throttling valve of valve core replaceable belongs to refrigeration technology field.
Background technology
At refrigeration technology field, carbon dioxide is a kind of environmental-friendly natural cold-producing medium, and it is also suitable with traditional freon refrigeration system as the performance of the critical-cross carbon dioxide refrigeration system of working medium, so carbon dioxide refrigerating system has very big development prospect.
In the critical-cross carbon dioxide kind of refrigeration cycle, what the high-pressure side cold-producing medium took place is not condensation process, but the cooling procedure of supercritical gas, its pressure and temperature are two independently variablees, although temperature is subjected to the qualification of cooling medium, pressure but directly is not restricted.In carbon dioxide refrigerating system, there is an optimum pressure value in high side pressure, and after high side pressure surpassed optimum pressure, refrigerating capacity was almost constant, and this moment, compressor horsepower increased, so COP can reduce; And when high side pressure was lower than optimum pressure, refrigerating capacity will obviously reduce, and this moment, compressor horsepower remained unchanged substantially, even can increase to some extent, caused COP significantly to descend.Therefore, the high side pressure in the critical-cross carbon dioxide refrigeration system need be controlled specially.In addition, in the critical-cross carbon dioxide refrigeration system, high side pressure can reach 70～150bar, is 7～10 times of refrigerating plant commonly used.Therefore no matter be to consider, in the critical-cross carbon dioxide refrigeration system, all can the device of directly high side pressure being regulated be set as common subcritical cycle refrigeration system from operational efficiency or from safety perspective.Controlled in order to guarantee critical-cross carbon dioxide refrigerating plant high side pressure, can adopt throttle mechanism to control on high-tension side pressure.When high side pressure is too high, increases the aperture of throttle mechanism, and when pressure is on the low side, then reduce aperture.
Find by prior art documents: the Chinese patent publication number is CN1580672A, open day is on February 16th, 2005, patent name is: critical-cross carbon dioxide refrigeration system fully mechanical throttling controlling organization, propose a kind of throttling controlling organization of regulating the high side pressure and the evaporator outlet degree of superheat, mainly comprise: choke valve, gas-liquid separator, blender, heating power expansion valve, high pressure control valve.Wherein high pressure control valve comprises: high voltage control valve regulation stream, high pressure control valve primary flow path, air inlet control piston, air inlet control spring, adjusting bolt, adjusting rod control piston, adjusting rod control spring, adjusting rod.The control of high side pressure is to control the gas quantity of refrigerant that enters the heating power expansion valve import by high pressure control valve to realize.High voltage control valve arrangement in this scheme is very complicated, and the kind of element is more and be not universal component, needs specialized designs, and manufacturing cost is higher, and reliability is bad.Aspect applicability, this throttling controlling organization can not effectively adjust corresponding high-pressure side optimum pressure when the gas cooler range of temperature is big.
In addition, common throttling arrangement commonly used all is to divide different specifications again in the different product line of branch, the different series, with the refrigeration system of coupling different capabilities demand, when promptly refrigerant system capacity need change, must change whole throttling arrangement.
Up to the present, the critical-cross carbon dioxide refrigeration system does not also appear being applicable to, adopt novel temperature-sensing element to adjust system optimal pressure automatically at different gas cooler exit temperature, simple in structure, easy accessibility, can be according to the adjustable throttle mechanism of power system capacity demand removable parts core assembly.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of carbon dioxide refrigerating system throttling valve of valve core replaceable is provided, core assembly can be changed according to the power system capacity demand, and can be with the variation automatic regulating system high-pressure side optimum pressure of gas cooler exit temperature.
The present invention is achieved by the following technical solutions, and the carbon dioxide refrigerating system throttling valve of the valve core replaceable that the present invention proposes comprises: sleeve pipe, valve seat, valve port, needle, driver plate, memory spring, driver plate connecting rod, inlet channel member, air inlet duct, centre bore, annular groove, inlet chamber, escape pipe joint, air inlet pipe, escape pipe, sealing block.Sleeve pipe left end point vicinity is by extrusion process, form an annular groove in the periphery, be used for the valve seat and the inlet channel member at its two ends are located, whole choke valve adopts detachable assembling, concrete mode is: be embedded with the 3rd sealing ring in the valve seat periphery, valve seat is fitted on the sleeve pipe left end internal face, valve port is positioned at the center of valve seat, be provided with the 4th sealing ring between valve seat and the annular groove, the valve seat left end is connected with the escape pipe joint screw thread that has escape pipe, be provided with the 6th sealing ring between escape pipe joint and the sleeve pipe, memory spring is placed in the right-hand member centre bore of inlet channel member, its right-hand member is near the step of centre bore right-hand member, left end contacts with the driver plate connecting rod, the driver plate periphery is embedded with first sealing ring, sealing block hole Nei Chu is embedded with the 5th sealing ring, driver plate and inlet channel member inner chamber wall closely cooperate, driver plate connecting rod and centre bore and sealing block closely cooperate, the valve seat of above-described band valve port, needle, driver plate, memory spring and driver plate connecting rod have constituted the core assembly of choke valve, this assembly is detachably changed, after specifically valve seat can being disassembled from sleeve pipe, according to the different system capacity requirement, change the valve port and the needle of different-diameter respectively, the memory spring of different size.Needle is fixed on driver plate left surface center, the driver plate connecting rod is fixed on driver plate right flank center, inlet chamber is by being arranged at air inlet duct and the air inlet pipe conducting on the inlet channel member, on the right side of sleeve pipe inlet end and left side escape pipe internal face, assemble inlet end filter screen and outlet side filter screen respectively, sleeve pipe right-hand member and air inlet pipe welding.
Be evenly equipped with an air inlet duct on the circumference of inlet channel member, its total circulation area is greater than the area of the valve port on the valve seat, inlet channel member periphery is embedded with second sealing ring, the inlet channel member is fitted on the internal face of sleeve pipe, and the confined space that inlet channel member and driver plate and driver plate connecting rod constitute is a vacuum state.Power and inlet chamber pressure that the memory spring compressive deformation produces act on driver plate simultaneously, and driver plate is stressed and drive the needle move left and right, to close or to open valve port.
Described memory spring adopts marmem to make, and all is in compressive state in the operating condition scope.Marmem is a kind of specific alloy material with memory characteristic, and memory spring can flexiblely automatically be institute's memorized shape under different temperatures.Selected memory spring is optimum pressure---the temperature characterisitic according to the outlet of carbon dioxide refrigerating system gas cooler among the present invention, deformation to memory spring---temperature characterisitic designs, and makes it be installed in the active force that is produced by compressive deformation in the choke valve under uniform temperature and length and can make the carbon dioxide refrigerating system high-pressure side reach optimum pressure.
Owing to used memory spring as temperature-sensing control element, choke valve of the present invention can tackle that the variation of gas cooler exit temperature transfers to optimum pressure with high side pressure automatically in the kind of refrigeration cycle, than other throttle mechanism, choke valve of the present invention relies on the pressure of system self to drive fully, and built-in temperature-sensing control element automatically adjusts.When throttle valve adjustment ability of the present invention can not satisfy the power system capacity demand, do not need the choke valve integral replacing,, change the valve port and the needle of different-diameter as long as valve seat is disassembled from escape pipe one end, and the memory spring of different size, to satisfy the coupling requirement of refrigeration system.Like this, by disassembled simply and change corresponding core assembly, make that most parts of choke valve of the present invention are all reusable, this environmental protection design form has been saved the use cost of this choke valve, has widened its range of application.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the schematic diagram of the inlet channel member 8 of choke valve of the present invention inside.
Fig. 3 is an A-A cutaway view shown in Figure 2.
Among Fig. 1: valve body 1, valve seat 2, valve port 3, needle 4, driver plate 5, memory spring 6, driver plate connecting rod 7, inlet channel member 8, air inlet duct 9, centre bore 10, annular groove 11, the first sealing rings 12, step 13, inlet end filter screen 14a, outlet side filter screen 14b, the second sealing ring 15a, the 3rd sealing ring 15b, the 4th sealing ring 15c, inlet chamber 16, escape pipe joint 17, air inlet pipe 18, escape pipe 19, sealing block 20, the five sealing rings 21, the six sealing rings 22.
Among Fig. 2-3: inlet channel member 8, air inlet duct 9, centre bore 10, the second sealing ring 15a, sealing block 20, the five sealing rings 21.
The specific embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described further.
As shown in Figure 1, the present invention includes: sleeve pipe 1, valve seat 2, valve port 3, needle 4, driver plate 5, memory spring 6, driver plate connecting rod 7, inlet channel member 8, air inlet duct 9, centre bore 10, annular groove 11, inlet chamber 16, escape pipe joint 17, air inlet pipe 18, escape pipe 19, sealing block 20.
Sleeve pipe 1 left end point vicinity is by extrusion process, form an annular groove 11 in the periphery, be used for the valve seat 2 and the inlet channel member 8 at its two ends are located, whole choke valve adopts detachable assembling, concrete mode is: be embedded with the 3rd sealing ring 15b in valve seat 2 peripheries, valve seat 2 is fitted on the sleeve pipe 1 left end internal face, valve port 3 is positioned at the center of valve seat 2, be provided with the 4th sealing ring 15c between valve seat 2 and the annular groove 11, valve seat 2 left ends are threaded with the escape pipe joint 17 that has escape pipe 19, be provided with the 6th sealing ring 22 between escape pipe joint 17 and the sleeve pipe 1, memory spring 6 is placed in the right-hand member centre bore 10 of inlet channel member 8, its right-hand member is near the step 13 of centre bore 10 right-hand members, left end contacts with driver plate connecting rod 7, driver plate 5 peripheries are embedded with first sealing ring 12, sealing block 20 hole Nei Chu are embedded with the 5th sealing ring 21, driver plate 5 closely cooperates with inlet channel member 8 inner chamber walls, driver plate connecting rod 7 closely cooperates with centre bore 10 and sealing block 20, the valve seat 2 of above-described band valve port 3, needle 4, driver plate 5, memory spring 6 and driver plate connecting rod 7 have constituted the core assembly of choke valve, this assembly is detachably changed, after specifically valve seat 2 can being disassembled from sleeve pipe 1, according to the different system capacity requirement, change the valve port 3 and the needle 4 of different-diameter respectively, the memory spring 6 of different size.Needle 4 is fixed on driver plate 5 left surface centers, driver plate connecting rod 7 is fixed on driver plate 5 right flank centers, inlet chamber 16 is by being arranged at the air inlet duct 9 and air inlet pipe 18 conductings on the inlet channel member 8, memory spring 6 adopts marmem to make, in the operating condition scope, all be in compressive state, inlet end filter screen 14a and outlet side filter screen 14b are assemblied in respectively on the right side inlet end and left side escape pipe 19 internal faces of sleeve pipe 1, sleeve pipe 1 right-hand member and air inlet pipe 18 welding.
Be evenly equipped with 12 air inlet ducts 9 on the circumference of the inlet channel member 8 shown in Fig. 2,3, its total circulation area is greater than the area of the valve port on the valve seat 23, inlet channel member 8 peripheries are embedded with the second sealing ring 15a, inlet channel member 8 is fitted on the internal face of sleeve pipe 1, and inlet channel member 8 is a vacuum state with the confined space that driver plate 5 and driver plate connecting rod 7 constitute.
When refrigeration system is moved, cold or the supercritical fluid of the mistake that is flowed out by gas cooler flows into choke valve of the present invention by air inlet pipe 18, lower amount of refrigerant flows into centre bore 10, refrigerant pressure acts on the right flank of driver plate connecting rod 7, memory spring 6 is experienced the refrigerant temperature that is flowed into by gas cooler, and also the right side to driver plate connecting rod 7 produces pressure.Simultaneously, a large amount of cold-producing mediums flow into inlet chamber 16 by air inlet duct 9, and cavity pressure acts on the left side of driver plate 5.When gas cooler exports under a certain temperature and pressure, driver plate 5 left sides are stressed stressed less than the right side, valve port 3 is in closed condition, continuous operation along with the system compresses machine, gas cooler internal high pressure gas pressure meets and exceeds optimum pressure with rising, the pressure of the inlet chamber 16 that equate with high side pressure this moment also raises gradually, make the stressed suffered active force in right side that meets and exceeds in driver plate 5 left sides, needle 4 will move right and open valve port 3 this moment, feasible flow by choke valve increases rapidly, high side pressure will be reduced gradually by elevated pressures, when the pressure of inlet chamber 16 during less than optimum pressure, driver plate 5 will drive needle 4 and re-move to valve port 3, make choke valve be in closed condition, when the pressure of inlet chamber 16 was elevated to optimum pressure once more with gas cooler pressure, valve port 3 began again to open, continue to repeat to open and close the process of valve port 3, make the interior pressure of gas cooler can reach the optimum pressure under the corresponding outlet temperature.When throttle valve adjustment ability of the present invention can not satisfy the power system capacity demand, can earlier escape pipe joint 17 be screwed off from valve seat 2 from escape pipe 19 1 ends, again valve seat 2 is extracted, change the valve port 3 and the needle 4 of different-diameter, and the memory spring 6 of different size, to satisfy the coupling requirement of refrigeration system.
The present invention has used memory spring that shape memory alloy material makes as temperature-sensing control element, with system self pressure as driving force, in carbon dioxide refrigerating system, can reach optimum pressure, make the Energy Efficiency Ratio of system's operation reach maximum at the pressure in the automatic adjustments of gas cooler of different gas cooler exit temperature.Global design of the present invention is flexible, and is simple in structure, can change core assembly according to user's request, and valve seal is good, has higher reliability and economy.
Claims (6)
1, a kind of carbon dioxide refrigerating system throttling valve of valve core replaceable, comprise: sleeve pipe (1), valve seat (2), valve port (3), needle (4), driver plate (5), memory spring (6), driver plate connecting rod (7), inlet channel member (8), air inlet duct (9), centre bore (10), annular groove (11), inlet chamber (16), escape pipe joint (17), air inlet pipe (18), escape pipe (19), sealing block (20), it is characterized in that: sleeve pipe (1) left end point periphery forms an annular groove (11), be used for the valve seat (2) and the inlet channel member (8) at its two ends are located, be embedded with the 3rd sealing ring (15b) in valve seat (2) periphery, valve seat (2) is fitted on sleeve pipe (1) the left end internal face, valve port (3) is positioned at the center of valve seat (2), be provided with the 4th sealing ring (15c) between valve seat (2) and the annular groove (11), valve seat (2) left end is threaded with the escape pipe joint (17) that has escape pipe (19), be provided with the 6th sealing ring (22) between escape pipe joint (17) and the sleeve pipe (1), needle (4) is fixed on driver plate (5) left surface center, driver plate connecting rod (7) is fixed on driver plate (5) right flank center, memory spring (6) is placed in the right-hand member centre bore (10) of inlet channel member (8), its right-hand member is near the step (13) of centre bore (10) right-hand member, left end contacts with driver plate connecting rod (7), inlet chamber (16) is by being arranged at the air inlet duct (9) and air inlet pipe (18) conducting on the inlet channel member (8), driver plate (5) periphery is embedded with first sealing ring (12), sealing block (20) hole Nei Chu is embedded with the 5th sealing ring (21), driver plate (5) closely cooperates with inlet channel member (8) inner chamber wall, driver plate connecting rod (7) closely cooperates with centre bore (10) and sealing block (20), the valve seat (2) of above-described band valve port (3), needle (4), driver plate (5), memory spring (6) and driver plate connecting rod (7) have constituted the core assembly of choke valve, and this core assembly is detachably changed.
2, the carbon dioxide refrigerating system throttling valve of valve core replaceable according to claim 1, it is characterized in that described inlet channel member (8) periphery is embedded with second sealing ring (15a), inlet channel member (8) is fitted on the internal face of sleeve pipe (1), sleeve pipe (1) right-hand member and air inlet pipe (18) welding.
3, the carbon dioxide refrigerating system throttling valve of valve core replaceable according to claim 1 and 2, it is characterized in that being evenly equipped with 12 air inlet ducts (9) on the circumference of described inlet channel member (8), its total circulation area is greater than the area of the valve port (3) on the valve seat (2).
4, the carbon dioxide refrigerating system throttling valve of valve core replaceable according to claim 1 is characterized in that described memory spring (6) adopts marmem to make, and all is in compressive state in the operating condition scope.
5, the carbon dioxide refrigerating system throttling valve of valve core replaceable according to claim 1 is characterized in that described inlet channel member (8) and the confined space that driver plate (5) and driver plate connecting rod (7) constitute are vacuum state.
6, the carbon dioxide refrigerating system throttling valve of valve core replaceable according to claim 1 is characterized in that being respectively equipped with inlet end filter screen (14a) and outlet side filter screen (14b) on the right side inlet end of described sleeve pipe (1) and left side escape pipe (19) internal face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008100407101A CN100549571C (en) | 2008-07-17 | 2008-07-17 | The carbon dioxide refrigerating system throttling valve of valve core replaceable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2008100407101A CN100549571C (en) | 2008-07-17 | 2008-07-17 | The carbon dioxide refrigerating system throttling valve of valve core replaceable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101315235A true CN101315235A (en) | 2008-12-03 |
| CN100549571C CN100549571C (en) | 2009-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2008100407101A Expired - Fee Related CN100549571C (en) | 2008-07-17 | 2008-07-17 | The carbon dioxide refrigerating system throttling valve of valve core replaceable |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101846201A (en) * | 2010-05-21 | 2010-09-29 | 重庆长安汽车股份有限公司 | Expansion valve of carbon dioxide automobile air conditioning system |
| CN104422211A (en) * | 2013-09-05 | 2015-03-18 | 珠海格力电器股份有限公司 | Air conditioner and short tube throttle valve thereof |
| CN109372470A (en) * | 2018-11-28 | 2019-02-22 | 美钻深海能源科技研发（上海）有限公司 | A kind of fixed restrictive valve and its spool replacing options of novel practical |
| CN110361171A (en) * | 2018-04-03 | 2019-10-22 | 宁波方太厨具有限公司 | Water outlet connector component resistance test tooling |
| CN111404061A (en) * | 2020-04-24 | 2020-07-10 | 魏冉冉 | Transformer substation heat dissipation device |
| CN112692089A (en) * | 2020-12-28 | 2021-04-23 | 滁州沃博自动化科技有限公司 | Valve seat of aluminum vehicle-mounted pendulum oil-free air compressor and manufacturing method thereof |
-
2008
- 2008-07-17 CN CNB2008100407101A patent/CN100549571C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101846201A (en) * | 2010-05-21 | 2010-09-29 | 重庆长安汽车股份有限公司 | Expansion valve of carbon dioxide automobile air conditioning system |
| CN104422211A (en) * | 2013-09-05 | 2015-03-18 | 珠海格力电器股份有限公司 | Air conditioner and short tube throttle valve thereof |
| CN104422211B (en) * | 2013-09-05 | 2016-08-24 | 珠海格力电器股份有限公司 | Air-conditioner and short-tube throttle valve thereof |
| CN110361171A (en) * | 2018-04-03 | 2019-10-22 | 宁波方太厨具有限公司 | Water outlet connector component resistance test tooling |
| CN109372470A (en) * | 2018-11-28 | 2019-02-22 | 美钻深海能源科技研发（上海）有限公司 | A kind of fixed restrictive valve and its spool replacing options of novel practical |
| CN109372470B (en) * | 2018-11-28 | 2023-09-26 | 美钻深海能源科技研发（上海）有限公司 | Novel practical fixed throttle valve and valve core replacement method thereof |
| CN111404061A (en) * | 2020-04-24 | 2020-07-10 | 魏冉冉 | Transformer substation heat dissipation device |
| CN112692089A (en) * | 2020-12-28 | 2021-04-23 | 滁州沃博自动化科技有限公司 | Valve seat of aluminum vehicle-mounted pendulum oil-free air compressor and manufacturing method thereof |
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| Publication number | Publication date |
|---|---|
| CN100549571C (en) | 2009-10-14 |
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