CN101666386A - Self-operated type three-way valve - Google Patents
Self-operated type three-way valve Download PDFInfo
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- CN101666386A CN101666386A CN200910093107A CN200910093107A CN101666386A CN 101666386 A CN101666386 A CN 101666386A CN 200910093107 A CN200910093107 A CN 200910093107A CN 200910093107 A CN200910093107 A CN 200910093107A CN 101666386 A CN101666386 A CN 101666386A
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- 238000013519 translation Methods 0.000 claims description 6
- 208000002925 dental caries Diseases 0.000 claims description 5
- 239000003507 refrigerant Substances 0.000 abstract description 29
- 238000005057 refrigeration Methods 0.000 abstract description 13
- 230000000903 blocking effect Effects 0.000 abstract 1
- 239000002826 coolant Substances 0.000 description 14
- 238000004891 communication Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 238000004378 air conditioning Methods 0.000 description 3
- 239000006200 vaporizer Substances 0.000 description 3
- 230000001746 atrial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
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Abstract
The invention relates to a self-operated type three-way valve which comprises a valve shell, a valve core, a compressed spring support seat, a compressed spring, a compressed spring blocking cylinder,a first capillary pipe, a second capillary pipe and a rotation preventing device. The self-operated type three-way valve is technically characterized in that a normally opened inlet, a normally closed inlet and an outlet are connected to the valve shell of the three-way valve, wherein the normally opened inlet is connected with a natural circulating mode, and the normally closed inlet is connected with a refrigerant refrigeration circulating mode; the outlet of a compressor is connected with a valve cavity at one side of the valve core by the capillary pipes, and the high pressure of the outlet of the compressor pushes the valve core to move, thereby changing a flow path of refrigerant and realizing the free switch of the natural circulating mode and the refrigerant refrigeration circulating mode without external force. The invention not only retains the function of switching the two working modes, but also leads the flow path of the refrigerant to convert by 90 DEG C on a plane. Theinvention guarantees the running performance of a special machine of a refrigerant natural circulating parallel usage type machine room, further improves the energy saving property and the reliabilityof a system and has the characteristics of reliable performance and automatic adjustment.
Description
Technical field
The present invention relates to a kind of self-operated three-way valve, it is a kind of autocontrol valve of two shared outlets of import, be applicable to the switching between the different condition lower pipeline, be particularly useful for the mode switching of coolant natural circulation type machine room special machine, belong to the valve design technical field.
Background technique
In recent years, communication network scale and userbase constantly enlarge, for building the working environment of communication apparatus, all need discharges heat from these environment the whole year, test result shows, the energy consumption of the air-conditioning equipment of the whole year operation of a large amount of communication base stations and module office reaches about 50% of total electricity consumption, has become the bottleneck that hinders telecommunications industry to develop in a healthy way.Therefore, the energy consumption problem of solution communications industry air-conditioning system has become the important topic of communication enterprise.
For reducing the air conditioning energy consumption of communication base station, as far back as 1985, Daikin Industrial Co., Ltd just develops " the coolant natural circulation type machine room special machine " that have the refrigerant natural circulation (referring to Sun Liying, horse is the best. the characteristic and the application of cryogen natural circulation air conditioner. and Harbin University of Commerce's journal (natural science edition), 2004,20 (6): 729-732.), its structure as shown in Figure 1.The structure and the working principle of this coolant natural circulation type machine room special machine are as follows: the coolant natural circulation type machine room special machine is made of outdoor unit 1, indoor units 2 two-part, constitutes an integral body by gas connection pipe 3 and liquid connecting tube 4; When outdoor temperature was low, solenoid valve 7, solenoid valve 8 were opened, and solenoid valve 9 cuts out, and machine room special machine converts the separate heat pipe system to, realizes room temperature lowering by natural circulation; When outdoor temperature was higher, solenoid valve 7, solenoid valve 8 were closed, and solenoid valve 9 is opened, and compressor 10 puts into operation, and machine room special machine is converted to refrigeration cycle, realizes the purpose of room temperature lowering.Machine room special machine is changed refrigeration cycle and natural circulation according to the height of room temperature, can reduce the energy consumption of room temperature lowering significantly.
Yet,, the Security of machine room special machine operation and reliability reduction, rate of fault rising, ride quality are reduced, so do not used well so far though adopt solenoid valve 7 and solenoid valve 9 can realize the switching of refrigerant refrigeration cycle and natural circulation.It is in particular in:
(1) because solenoid valve inside has seal ring, frequent movement or long-term work cause seal ring distortion or sex change easily in hot environment, make solenoid valve loss of seal performance, do not have and close effect; On the other hand, the working life of solenoid valve is limited, and after surpassing certain keying number of times, solenoid valve will lose efficacy, and cause the machine room special machine fault.
(2) solenoid valve needs electric power as power, and is charged all the time during unlatching, in vain consume electric power.
(3) valve port of solenoid valve is the local resistance parts that a refrigerant flows, and no matter is refrigeration cycle or natural circulation, all will cause the pressure of refrigerant to reduce, and influences the performance of machine room special machine; Particularly break down can not open the time when solenoid valve 9, compressor can not aspirate the gas in the vaporizer 6, and compressor 10 delivery temperatures will be raise, and burns compressor;
(4) when natural circulation, solenoid valve 7 is opened, and refrigerant vapor enters condenser 5 through liquid connecting tube 3, solenoid valve 7 from vaporizer 6, and inevitable some refrigerant enters in the compressor along compressor exhaust pipe, liquid hammer appears when causing compressor to start once more, the infringement compressor.
In view of the foregoing, really bring into play its energy-saving effect for making the coolant natural circulation type machine room special machine, must propose solve the solenoid valve 7 of above-mentioned four big defectives and the replacement scheme of solenoid valve 9, the brand-new refrigerant refrigeration cycle and the switching part of natural circulation promptly must be provided.
The best scheme of switching part that realizes the refrigerant commutation is to adopt three-way valve.Yet, at present the various three-way valve technological schemes that occur all are at the commutation problem that solves two outlets of an import, and are used for the refrigerant refrigeration cycle of coolant natural circulation type machine room special machine and three-way valve that natural circulation is switched is a kind of autocontrol valve with two shared outlets of import.
Summary of the invention
At above-mentioned the deficiencies in the prior art, the present invention proposes a kind of self-operated three-way valve, solve the refrigerant refrigeration cycle pattern of this kind coolant natural circulation type machine room special machine and the problem that natural circulation mode is switched and made things convenient for site operation to install, thereby further promote the energy saving and the reliability of complex machine group system.
Technological scheme of the present invention is as follows:
A kind of self-operated three-way valve comprises valve chest 13, spool 14, stage clip bearing 16, stage clip 17, stage clip retaining tube 18, first capillary tube 20, second capillary tube 21 and the anti-rotation device; Be connected with outlet C on the described valve chest 13, often drive mouthful E and normally closed import D into, described outlet C, normally closed import D and often drive a mouthful E into and be positioned at same plane, its middle outlet C and often drive mouthful E into and be positioned on the same straight line on the described plane, and on the vertical line of the described straight line of normally closed import D; Described stage clip bearing 16 is fixed on the spool 14, and stage clip 17 is fixed on stage clip bearing 16 and the stage clip retaining tube 18; Described spool 14 is provided with circular channel 23 and curved channel 24, and the distance between circular channel 23 and curved channel 24 axis equals the operating range of 18 in spool 14 and stage clip retaining tube; Described first capillary tube, 20 1 ends with often drive a mouthful E into and be communicated with, the other end is communicated with spool 14 1 side cavitys; Described second capillary tube, 21 1 ends are communicated with normally closed import D, and the other end is communicated with the opposite side cavity of spool 14; On the described valve chest 13 often drive into mouthful E under nature by circular channel on the spool 14 23 and outlet C conducting, normally closed import D is at normally closed import D, often drive into and have between mouthful E under the pressure reduction state by curved channel 24 and outlet C conducting.
The present invention has the following advantages and the high-lighting effect:
A kind of self-operated three-way valve provided by the invention, do not need external force can realize the refrigerant refrigeration cycle pattern of coolant natural circulation type machine room special machine and freely switching of natural circulation mode, the energy saving and the reliability of machine room special machine have been promoted, for the power savings advantages of giving full play to the coolant natural circulation type machine room special machine provides the key technology measure.Be embodied in:
1. during natural circulation, stage clip is in free state, and the through hole of spool makes two often to drive a mouthful E, outlet C conducting into, refrigerant vapor through this self-operated three-way valve often drive a mouthful E into, outlet C enters condenser; During the refrigerant refrigeration cycle, compressor start, its higher exhaust pressure promotes spool and moves, and makes normally closed import D and outlet C conducting, and refrigerant vapor enters condenser through normally closed import D, the outlet C of three-way valve, and spool makes and often drives a mouthful E closure into simultaneously.Owing to only rely on the elastic force of stage clip and the suction and discharge pressure reduction of compressor to realize freely switching of natural circulation mode and refrigeration cycle pattern, therefore, improved the reliability of unit operation, reduced rate of fault.
2. self-operated three-way valve of the present invention does not need any external force, so have energy-saving effect.
3. self-operated three-way valve of the present invention only has reciprocal two states, and no matter be often drive mouthful E and outlet C conducting into, or when normally closed import D and outlet C conducting, the resistance of valve is all very little, has improved the performance of machine room special machine.
4. during natural circulation, this self-operated three-way valve often drive mouthful E and outlet C conducting into, make normally closed import D place pipe be in airtight cut-off state simultaneously, stoped refrigerant to enter in the compressor exhaust pipe, can not cause the compressor liquid hit phenomenon to take place.
Above-mentioned self-operated three-way valve technological scheme by the present invention's proposition, coolant natural circulation type machine room special machine shown in Figure 1 is carried out technological improvement, form novel coolant natural circulation type machine room special machine shown in Figure 2, keep and have the function of switching two kinds of patterns, and make refrigerant flow under not needing external force, remain in the plane 90 ° conversion, made things convenient for the site operation installation, effectively strengthened the energy saving and the reliability of system, significant for the Performance And Reliability that improves machine room special machine.
Description of drawings
Fig. 1 is the structure principle chart of prior art " coolant natural circulation type machine room special machine ".
Fig. 2 is the structure principle chart of " coolant natural circulation type machine room special machine " behind application the present invention.
Fig. 3 is the structural principle schematic representation (stereogram) of self-operated three-way valve disclosed by the invention.
Fig. 4 is the structural principle schematic representation (complete section plan view when E, C conducting) of self-operated three-way valve disclosed by the invention.
Fig. 5 is the structural principle schematic representation (left side sectional view when E, C conducting) of self-operated three-way valve disclosed by the invention.
Fig. 6 is the structural principle schematic representation (partly cuing open plan view when D, C conducting) of self-operated three-way valve disclosed by the invention.
Fig. 7 is the structural principle schematic representation (left side sectional view when D, C conducting) of self-operated three-way valve disclosed by the invention.
Fig. 8 is the structural principle schematic representation (plan view) of self-operated three-way valve disclosed by the invention.
Fig. 9 is the structural principle schematic representation (left view) of self-operated three-way valve disclosed by the invention.
Figure 10 is the structural principle schematic representation (plan view) of self-operated three-way valve disclosed by the invention.
Figure 11, Figure 12, Figure 13 are three kinds of implementation figure of the anti-rotation device of self-operated three-way valve disclosed by the invention.
Among Fig. 1～Fig. 8: the outdoor unit of 1-; The 2-indoor units; The 3-gas connection pipe; 4-liquid connecting tube; The 5-condenser; The 6-vaporizer; The 7-solenoid valve; The 8-solenoid valve; The 9-solenoid valve; The 10-compressor; The 11-throttle mechanism; The 12-self-operated three-way valve; The 13-valve chest; The 14-spool; 16-stage clip bearing; The 17-stage clip; 18-stage clip retaining tube; 20-first capillary tube; 21-second capillary tube; The 22-locating stud; The 23-circular channel; The 24-curved channel; 25a-first groove; 25b one second groove; The C-outlet; The normally closed import of D-; E-often drives mouth into.
Embodiment
A kind of self-operated three-way valve disclosed by the invention is described as follows in conjunction with the accompanying drawings and embodiments.
Fig. 2 is the application schematic representation of the present invention in the coolant natural circulation type machine room special machine.Outlet C links to each other with condenser 5 inlets, and normally closed import D links to each other with compressor 10 outlets, often drives mouthful E into and links to each other with gas connection pipe 3.Under the natural circulation mode, often drive a mouthful E, outlet C conducting into, refrigerant vapor is by often driving mouthful E circular channel 23 in the spool 14 of flowing through into, and C flows out to condenser 5 through outlet.Under the refrigerant refrigeration cycle pattern, compressor 10 starts, discharge pressurized gas, pressure is reached in the spool 14 left side cavitys by the connection of second capillary tube 21, and then make the pressure in spool 14 left sides greater than right atrial pressure, promoting spool 14 moves to right, until normally closed import D, outlet C conducting, this drives a mouthful E often into, outlet C ends, and refrigerant is by flow through curved channel 24 in the spool 14 of normally closed import D, C flows out to condenser 5 through outlet, realizes the switching of refrigerant pipeline.
Fig. 4 is the structural principle schematic representation (complete section plan view when E, C conducting) of self-operated three-way valve provided by the invention.This self-operated three-way valve comprises valve chest 13, spool 14, stage clip bearing 16, stage clip 17, stage clip retaining tube 18, first capillary tube 20, second capillary tube 21 and the anti-rotation device; Be connected with outlet C on the described valve chest 13, often drive mouthful E and normally closed import D into, described outlet C, normally closed import D and often drive a mouthful E into and be positioned at same plane, its middle outlet C and often drive mouthful E into and be positioned on the same straight line on the described plane, and on the vertical line of the described straight line of normally closed import D; Described stage clip bearing 16 is fixed on the spool (14), and stage clip 17 is fixed on stage clip bearing 16 and the stage clip retaining tube 18; Described spool 14 is provided with circular channel 23 and curved channel 24, and the distance between circular channel 23 and curved channel 24 axis equals the operating range of 18 in spool 14 and stage clip retaining tube; Described first capillary tube, 20 1 ends with often drive a mouthful E into and be communicated with, the other end is communicated with spool 14 1 side cavitys; Described second capillary tube, 21 1 ends are communicated with normally closed import D, and the other end is communicated with the opposite side cavity of spool 14; On the described valve chest 13 often drive into mouthful E under nature by circular channel on the spool 14 23 and outlet C conducting, normally closed import D is at normally closed import D, often drive into and have between mouthful E under the pressure reduction state by curved channel 24 and outlet C conducting.Under the normal state, refrigerant pressure reduction is less in the pipeline, and this drives a mouthful E, outlet C conducting often into, and refrigerant is by often driving mouthful E circular channel 23 in the spool 14 of flowing through into, and C flows out through outlet.
Fig. 6 is the structural principle schematic representation (partly cuing open plan view when D, C conducting) of self-operated three-way valve disclosed by the invention.This self-operated three-way valve comprises valve chest 13, spool 14, stage clip bearing 16, stage clip 17, stage clip retaining tube 18, first capillary tube 20, second capillary tube 21 and the anti-rotation device; Be connected with outlet C on the described valve chest 13, often drive mouthful E and normally closed import D into, described outlet C, normally closed import D and often drive a mouthful E into and be positioned at same plane, its middle outlet C and often drive mouthful E into and be positioned on the same straight line on the described plane, and on the vertical line of the described straight line of normally closed import D; Described stage clip bearing 16 is fixed on the spool 14, and stage clip 17 is fixed on stage clip bearing 16 and the stage clip retaining tube 18; Described spool 14 is provided with circular channel 23 and curved channel 24, and the distance between circular channel 23 and curved channel 24 axis equals the operating range of 18 in spool 14 and stage clip retaining tube; Described first capillary tube, 20 1 ends with often drive a mouthful E into and be communicated with, the other end is communicated with spool 14 1 side cavitys; Described second capillary tube, 21 1 ends are communicated with normally closed import D, and the other end is communicated with the opposite side cavity of spool 14; On the described valve chest 13 often drive into mouthful E under nature by circular channel on the spool 14 23 and outlet C conducting, normally closed import D is at normally closed import D, often drive into and have between mouthful E under the pressure reduction state by curved channel 24 and outlet C conducting.When normally closed import D with often drive that pressure reduction is increased to a certain degree among mouthful E into, connection by second capillary tube 21, the pressure in spool 14 left sides is greater than right atrial pressure, and then promote spool 14 and move to right, until normally closed import D, outlet C conducting, this drives a mouthful E often into, outlet C ends, refrigerant is by flow through curved channel 24 in the spool 14 of normally closed import D, C flows out through outlet, realizes the switching of refrigerant pipeline, and then realizes the switching of two kinds of mode of operations.
Figure 11 is one of three kinds of implementations of the anti-rotation device of a kind of self-operated three-way valve disclosed by the invention.Anti-rotation device is made up of the locating stud 22 and the first groove 25a that is arranged on the spool 14, and wherein locating stud is fixed on the valve chest 13, and agrees with in the groove on spool 14, makes the spool 14 can only translation, and can not rotate.
Figure 12 be a kind of self-operated three-way valve disclosed by the invention anti-rotation device three kinds of implementations two.Anti-rotation device is made up of the locating stud 22 and the second groove 25b that is arranged on the valve chest 13, and wherein locating stud 22 is fixed on the spool 14, and agrees with in the second groove 25b on valve chest 13, makes the spool 14 can only translation, and can not rotate.
Figure 13 be a kind of self-operated three-way valve disclosed by the invention anti-rotation device three kinds of implementations three.Anti-rotation device is made up of locating stud 22, the first groove 25a and the second groove 25b that are separately positioned on spool 14 and the valve chest 13, and locating stud 22 is not fixed on spool 14 and the valve chest 13, makes the spool 14 can only be in translation, and can not rotate.
Claims (4)
1. self-operated three-way valve is characterized in that: self-operated three-way valve comprises valve chest (13), spool (14), stage clip bearing (16), stage clip (17), stage clip retaining tube (18), first capillary tube (20), second capillary tube (21) and anti-rotation device; Be connected with outlet C on the described valve chest (13), often drive mouthful E and normally closed import D into, described outlet C, normally closed import D and often drive a mouthful E into and be positioned at same plane, its middle outlet C and often drive mouthful E into and be positioned on the same straight line on the described plane, and on the vertical line of the described straight line of normally closed import D; Described stage clip bearing (16) is fixed on the spool (14), and stage clip (17) is fixed on stage clip bearing (16) and the stage clip retaining tube (18); Described spool (14) is provided with circular channel (23) and curved channel (24), and the distance between circular channel (23) and curved channel (24) axis equals spool (14) and stage clip retaining tube
(18) operating range between; Described first capillary tube (20) one ends with often drive a mouthful E into and be communicated with, the other end is communicated with spool (14) one side cavitys; Described second capillary tube (21) one ends are communicated with normally closed import D, and the other end is communicated with the opposite side cavity of spool (14); On the described valve chest (13) often drive into mouthful E under nature by circular channel (23) on the spool (14) and outlet C conducting, normally closed import D is at normally closed import D, often drive into and have between mouthful E under the pressure reduction state by curved channel (24) and outlet C conducting.
2. according to the described a kind of self-operated three-way valve of claim 1, it is characterized in that: described anti-rotation device is made up of locating stud (22) and the groove (25a) that is arranged on the spool (14), wherein locating stud is fixed on the valve chest (13), and agree with in the groove (25a) on spool (14), make the spool (14) can only translation, and can not rotate.
3. according to the described a kind of self-operated three-way valve of claim 1, it is characterized in that: described anti-rotation device is made up of locating stud (22) and the groove (25b) that is arranged on the valve chest (13), wherein locating stud (22) is fixed on the spool (14), and agree with in the groove on valve chest (13), make the spool (14) can only translation, and can not rotate.
4. according to the described a kind of self-operated three-way valve of claim 1, it is characterized in that: described anti-rotation device is made up of locating stud (22), first groove (25a) and second groove (25b) that are separately positioned on spool (14) and the valve chest (13), and locating stud (22) is not fixed on spool (14) and the valve chest (13), make the spool (14) can only be, and can not rotate in translation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100931074A CN101666386B (en) | 2009-09-18 | 2009-09-18 | Self-operated type three-way valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100931074A CN101666386B (en) | 2009-09-18 | 2009-09-18 | Self-operated type three-way valve |
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| Publication Number | Publication Date |
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| CN101666386A true CN101666386A (en) | 2010-03-10 |
| CN101666386B CN101666386B (en) | 2012-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009100931074A Expired - Fee Related CN101666386B (en) | 2009-09-18 | 2009-09-18 | Self-operated type three-way valve |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769393A (en) * | 2010-03-17 | 2010-07-07 | 北京水木能环节能技术有限公司 | Self-operated type tee valve |
| CN101975419A (en) * | 2010-11-26 | 2011-02-16 | 哈尔滨工业大学 | Heating system using self-operated three-way water-mixing temperature regulating valve |
| CN106032846A (en) * | 2015-03-17 | 2016-10-19 | 浙江盾安禾田金属有限公司 | Self-operated three-way valve and air-conditioning system thereof |
| CN113431927A (en) * | 2021-07-09 | 2021-09-24 | 姜林 | Rotary butterfly type three-way pressure reducing valve |
| CN113464692A (en) * | 2021-07-16 | 2021-10-01 | 浙江启尔机电技术有限公司 | Quick exhaust valve with overvoltage protection function |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL3483692T3 (en) * | 2017-11-14 | 2023-06-12 | Frese A/S | A differential pressure control valve |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3894561A (en) * | 1974-03-14 | 1975-07-15 | Controls Co Of America | Four-way reversing valve with differential area operator |
| CN1267799A (en) * | 1999-03-22 | 2000-09-27 | 徐灿 | Four-way change valve |
| CN101245864B (en) * | 2008-03-17 | 2010-09-22 | 时代嘉华（中国）科技有限公司 | Self-operated three-way valve used for coolant circulating type machine room special machine |
-
2009
- 2009-09-18 CN CN2009100931074A patent/CN101666386B/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769393A (en) * | 2010-03-17 | 2010-07-07 | 北京水木能环节能技术有限公司 | Self-operated type tee valve |
| CN101975419A (en) * | 2010-11-26 | 2011-02-16 | 哈尔滨工业大学 | Heating system using self-operated three-way water-mixing temperature regulating valve |
| CN101975419B (en) * | 2010-11-26 | 2012-08-15 | 哈尔滨工业大学 | Heating system using self-operated three-way water-mixing temperature regulating valve |
| CN106032846A (en) * | 2015-03-17 | 2016-10-19 | 浙江盾安禾田金属有限公司 | Self-operated three-way valve and air-conditioning system thereof |
| CN106032846B (en) * | 2015-03-17 | 2019-12-24 | 浙江盾安禾田金属有限公司 | Self-operated three-way valve and air conditioning system thereof |
| CN113431927A (en) * | 2021-07-09 | 2021-09-24 | 姜林 | Rotary butterfly type three-way pressure reducing valve |
| CN113464692A (en) * | 2021-07-16 | 2021-10-01 | 浙江启尔机电技术有限公司 | Quick exhaust valve with overvoltage protection function |
| CN113464692B (en) * | 2021-07-16 | 2023-04-18 | 浙江启尔机电技术有限公司 | Quick exhaust valve with overvoltage protection function |
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|---|---|
| CN101666386B (en) | 2012-01-18 |
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Granted publication date: 20120118 |