CN101761689B - A kind of electric expansion valve using corrugated tube - Google Patents
A kind of electric expansion valve using corrugated tube Download PDFInfo
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- CN101761689B CN101761689B CN200810173580.9A CN200810173580A CN101761689B CN 101761689 B CN101761689 B CN 101761689B CN 200810173580 A CN200810173580 A CN 200810173580A CN 101761689 B CN101761689 B CN 101761689B
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- expansion valve
- electric expansion
- corrugated tube
- opening travel
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Abstract
A kind of electric expansion valve using corrugated tube of disclosure, is characterized in its free aperture maximum opening travel less than this electric expansion valve.Preferably, the free aperture of described electric expansion valve also may be selected to be the 55%～100% of maximum opening travel.It is further preferred that free aperture is its maximum opening travel the 67%～86% of electric expansion valve.Preferably, when the maximum opening travel of described electric expansion valve is 0.7mm, the free aperture of described electric expansion valve is 0.4mm～0.7mm.Preferably, the maximum opening travel of described electric expansion valve is 0.7mm, and the free aperture of described electric expansion valve is 0.47mm～0.6mm.Instant invention overcomes the technology prejudice thinking that electronic expansion valve needle rollback fully relies on corrugated tube back stretch, make corrugated tube maximum tension amount diminish, the maximum stress in bend born reduces, life.
Description
Technical field
The present invention relates to a kind of electric expansion valve, be specifically related to a kind of electric expansion valve using corrugated tube.
Background technology
Electric expansion valve is that one occurred novel throttle element in recent years, and utilization rate within air-conditioning systems constantly increases.Major advantage is that of electric expansion valve accurately controls refrigerant flow such that it is able to accurately control evaporating temperature.Generally, higher local use is required at temperature-controlled precision.
Refer to Fig. 1, this illustrates the basic structure of a kind of motor electric expansion valve conventional at present.This electric expansion valve is used for controlling cold medium flux in convertible frequency air-conditioner.
Fig. 1 illustrates, this electric expansion valve has motor 1, and the output shaft of this motor 1 connects three grades of gear reduction units 2 slowed down, and by wire rod thread pair 5, the convert rotational motion of motor 1 becomes the rectilinear motion of screw mandrel 5-1.The nut of this feed screw nut pair 5 is fixed with valve body 11, and the rotation of described screw mandrel 5-1 makes it produce above-below direction rectilinear movement.The lower end of this screw mandrel 5-1 is connected to a steel ball 13, by being press-fitted to the lining 14 in valve rod 12, is exported by active force, makes the valve rod 12 being positioned at valve body 11 inner chamber produce to move up and down.The lower end of this valve rod 12 is provided with needle 9, the conical seal (contact) face of this needle 9 front portion just valve port 10 to valve body 11, moves up and down, by needle 9, the size controlling valve port 10 opening, makes the valve port 10 can in completely enclosed and change between fully opening.This valve port 10 is at inlet pipe and goes out between pipe, and its openings of sizes can control the flow of coolant.Also including corrugated tube 7 in this electric expansion valve, this corrugated tube 7 is enclosed within the cylinder of valve rod 12, and its upper end is fixed on the roof of valve body 11 inner chamber by pad 4, and lower end is closely knit fixing with the lobe of valve rod 12 periphery.This corrugated tube 7 has the effect of two aspects.First, refrigerant passage and moving component are separated by this corrugated tube 7, in case coolant leakage；Secondly, this corrugated tube 7 is as flexible member, and when valve port is closed, motor 1 drives screw mandrel 5-1 to move to Figure below, and screw mandrel 5-1 withstands valve rod 12 and drives needle 9 to move down, and corrugated tube 7 is now stretched；When valve port is opened, when motor 1 drives screw mandrel 5-1 to move upward, needle 9 constantly moves up under the drive of system pressure and corrugated tube 7 back stretch, follows screw mandrel 5-1 and rises, makes needle 9 can produce as requested to move up and down the size controlling flow.
Owing to the control of refrigeration system requires to improve constantly, make valve port 10 on-off action very frequent.Corrugated tube 7 also frequently stretches therewith.It addition, Novel cooling medium continually develops use, system pressure is also more and more higher.Such as, R410A coolant, system pressure can reach 4.2Mpa, and this makes the radial pressure that described corrugated tube 7 is subject to increasing, is very easy to cause the fracture damage of corrugated tube 7, and this becomes the key element determining electric expansion valve accident-free duration.
Summary of the invention
For drawbacks described above, present invention solves the technical problem that and be in that, it is provided that a kind of electric expansion valve using corrugated tube, the structural design of this electric expansion valve can make corrugated tube have longer service life.
A kind of electric expansion valve using corrugated tube of disclosure, the free aperture of this electric expansion valve is less than the maximum opening travel of this electric expansion valve.
Preferred in, free aperture is its maximum opening travel the 55%～100% of described electric expansion valve, this numerical range does not include 100%.
Preferably, free aperture is its maximum opening travel the 67%～86% of described electric expansion valve.
Preferably, the maximum opening travel of described electric expansion valve is 0.7mm, and the free aperture of described electric expansion valve is 0.4mm～0.7mm, and this numerical range is without 0.7mm.
Preferably, the maximum opening travel of described electric expansion valve is 0.7mm, and the free aperture of described electric expansion valve is 0.47mm～0.6mm.
In prior art, owing to thinking that the rollback of electronic expansion valve needle fully relies on the back stretch of corrugated tube, therefore, the free aperture of electric expansion valve is designed as the free opening travel more than described electric expansion valve, or identical with free opening travel.This makes the maximum tension amount free opening travel be more than or equal to electric expansion valve of corrugated tube.In this case, corrugated tube is operationally always at extended state and amount of tension is bigger.Due to the positively related relation that bending stress is acceleration that the tensile elongation of corrugated tube is born with its ripple, therefore, tensile elongation is long, and the possibility of corrugated tube ripple fracture will quickly increase, and this makes corrugated tube become the bottleneck affecting the electric expansion valve life-span.And in the technical program, the free aperture of this electric expansion valve is less than its free opening travel, so, during corrugated tube work in varied situations, it is possible to be in stretching and shrink two states.The maximum tension amount of corrugated tube diminishes so that it is the maximum stress in bend that ripple bears significantly reduces, its life.
According to test statistics, being the electric expansion valve of 0.7mm for free opening travel, select the free aperture of 0.4mm, corrugated tube can reach 160,000 times service life, and uses the free aperture of 0.7mm, then can only achieve 110,000 times.
Technical scheme overcomes the technology prejudice of prior art, hence it is evident that improve the number of times in service life of corrugated tube, and and then improve the bulk life time of electric expansion valve, it is contemplated that the application of this technology can bring significant commercial interest to enterprise.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of typical electric expansion valve；
Fig. 2 is the view that the needle of first embodiment of the invention electric expansion valve is in free position；
Fig. 3 is the view that the needle of first embodiment of the invention electric expansion valve is in maximum valve opening position；
Fig. 4 is the close-up schematic view that the needle of first embodiment of the invention electric expansion valve is in maximum valve opening position；
Fig. 5 is that first embodiment of the invention electric expansion valve is in the view closing valve position.
Detailed description of the invention
First embodiment of the invention provides a kind of electric expansion valve, and the bore of this electric expansion valve, between 1.3mm-6.4mm, uses the corrugated tube of 14 ripples.
Refer to Fig. 2, this figure is the state diagram that the needle 9 of electric expansion valve that first embodiment of the invention provides is in free position.Fig. 3 is the state diagram that the needle of electric expansion valve is in maximum valve opening position；Fig. 4 is the partial enlarged drawing that the needle of electric expansion valve is in maximum valve opening position；Fig. 5 is that electric expansion valve is in the state diagram closing valve position.
In the position described in Fig. 2, there is no system pressure, it addition, motor 1 also without providing the thrust making it to the motion of valve port 10 direction to needle 9, corrugated tube 7 is in free elongation state.Now, the sealing of needle 9 is H to the vertical dimension of valve port, and this vertical dimension H is called the free aperture of electric expansion valve.
Described electric expansion valve also has maximum opening travel S, and this maximum opening travel S is that needle 9 moves to the stroke of the maximum valve opening position shown in Fig. 3 from the valve position that closes shown in Fig. 5.The exemplary value of the trip is 0.7mm.This segment distance can meet electric expansion valve instructions for use in systems.
Under prior art, always free aperture H is designed as with maximum opening travel S-phase with or slightly larger than maximum opening travel.This be due to, it is generally acknowledged, when motor 1 obtains reverse impulse rollback, why described needle 9 can follow valve rod 12 rollback thus opening valve port 10, it is dependent on the back stretch that corrugated tube 7 provides to valve rod 12, completely enclose, owing to corrugated tube 7 can only achieve distance valve port 10 in a free state, the distance that position is free aperture H, just cannot provide back stretch higher than this distance corrugated tube 7；So, prior art is thought, only free aperture H and maximum opening travel S-phase with or during more than maximum opening travel S, just can ensure that and make needle 9 reliable movement in the distance scale of maximum opening travel S, do not have the back stretch deficiency owing to corrugated tube 7 provides and cause needle 9 cannot return to the maximum valve opening position shown in Fig. 3.
Under the guidance of above-mentioned thought, corrugated tube 7 is almost surely stretched power after installing.It is designed as at free aperture H same with maximum opening travel S-phase, and when needle 9 is in maximum valve opening position, corrugated tube 7 is only possible to and is in its naturalness, not tension stretch.Extended state almost it is in all the time so that it is each ripple is subject to bending stress laterally all the time due to corrugated tube 7.In electric expansion valve use procedure, owing to corrugated tube 7 pulling action is frequent, often other element still can normal operation time, this corrugated tube 7 ruptures so that it is become the bottleneck affecting the electric expansion valve life-span.
The design adopted in the embodiment of the present invention is to be designed as free aperture H less than maximum opening travel S.This is because, when corrugated tube 7 works, be always subjected to be in the effect of its outside coolant, owing to currently used coolant pressure is very big, the pressure of coolant can apply enough strength to corrugated tube 7 completely so that it is produces to shrink, and drives needle 9 rollback.Under this design, corrugated tube 7 is along with the difference of valve port opening degree, and it is likely to be operated in the state stretching or shrinking, rather than is only operated at extended state.This design creates the good effect of two aspects, and first, the maximum tension amount of corrugated tube 7 reduces so that it is the maximum stress in bend that ripple bears is greatly reduced so that it is service life, number of times increased；Secondly, corrugated tube 7 is operated in stretching and two kinds of duties of compression, and it is in free state and the neighbouring position time is longer, minimum in these position corrugated tube 7 stress, so also promotes its number of times increase in service life.
In a preferred version of the present embodiment, maximum opening travel S is 0.7mm, and described free aperture H is chosen as 0.5mm, then described corrugated tube 7 is in the trip, and the scope having 0.5mm is operated in extended state, has the scope of 0.2mm to be operated in compressive state.Actual tests proves, under this design, this corrugated tube life-span number of times reaches 160,000 times, and free aperture H is designed as 0.7mm, then the life-span number of times of corrugated tube is at about 110,000 times.Visible this design has been obviously prolonged corrugated tube service life, and accordingly, the service life of electric expansion valve also can be obviously prolonged.
In preferred version of the present invention, when maximum opening travel S is 0.7mm, described free aperture H is in 0.4mm～0.7mm scope (without 0.7mm)；In further preferred version, described free aperture H is 0.47mm～0.6mm.
Each item data of first embodiment above is based on the occasion of the electric expansion valve of the corrugated tube using wave number to be 14, and the maximum opening travel of this electric expansion valve is 0.7mm.It is the occasion between 1.3mm～6.4mm that this electric expansion valve is used in bore.When bore is not in above-mentioned numerical range, the corrugated tube wave number that this electric expansion valve uses is it can also happen that change, the maximum opening travel of corrugated tube also can change, in these cases, equally possible selection realizes, less than the free aperture of corresponding maximum opening travel, the effect that above-mentioned first embodiment obtains.Accordingly, its preferred free open range can adopt the ratio accounting for its maximum opening travel to describe.Through a large amount of correlation tests, it has been found that free aperture H accounts for described maximum opening travel scope can obtain the effect significantly extending corrugated tube number of times in service life in 55%～100% (without 100%)；Further test data shows, free aperture H accounts for described maximum opening travel scope can obtain optimum efficiency between 67%～86%.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention; can also making some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (5)
1. the electric expansion valve using corrugated tube, it is characterised in that the free aperture of this electric expansion valve is less than the maximum opening travel of this electric expansion valve, so that corrugated tube is along with the difference of valve port opening degree, it is possible to be operated in the state stretching or shrinking.
2. the electric expansion valve of use corrugated tube according to claim 1, it is characterised in that free aperture is its maximum opening travel the 55%～100% of described electric expansion valve, this numerical range does not include 100%.
3. the electric expansion valve of use corrugated tube according to claim 2, it is characterised in that free aperture is its maximum opening travel the 67%～86% of described electric expansion valve.
4. the electric expansion valve of use corrugated tube according to claim 1, it is characterised in that the maximum opening travel of described electric expansion valve is 0.7mm, the free aperture of described electric expansion valve is 0.4mm～0.7mm, and this numerical range is without 0.7mm.
5. the electric expansion valve of use corrugated tube according to claim 4, it is characterised in that the maximum opening travel of described electric expansion valve is 0.7mm, the free aperture of described electric expansion valve is 0.47mm～0.6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810173580.9A CN101761689B (en) | 2008-11-06 | 2008-11-06 | A kind of electric expansion valve using corrugated tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810173580.9A CN101761689B (en) | 2008-11-06 | 2008-11-06 | A kind of electric expansion valve using corrugated tube |
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| Publication Number | Publication Date |
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| CN101761689A CN101761689A (en) | 2010-06-30 |
| CN101761689B true CN101761689B (en) | 2016-07-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200810173580.9A Active CN101761689B (en) | 2008-11-06 | 2008-11-06 | A kind of electric expansion valve using corrugated tube |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102563086B (en) * | 2010-12-17 | 2015-04-08 | 浙江三花股份有限公司 | Electronic expansion valve and valve body device thereof |
| CN102913676A (en) * | 2011-08-01 | 2013-02-06 | 浙江三花股份有限公司 | Electronic expansion valve and processing method thereof |
| CN103453201B (en) * | 2012-06-04 | 2017-03-08 | 浙江三花智能控制股份有限公司 | A kind of electric expansion valve and combinations thereof method |
| CN103883748B (en) * | 2012-12-24 | 2016-05-11 | 艾默生环境优化技术(苏州)有限公司 | Valve needle assembly and electronic expansion valve comprising same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1310305A (en) * | 2000-01-21 | 2001-08-29 | 昭和电工株式会社 | Halogen corrosive gas valve and its producing method |
| CN2531214Y (en) * | 2001-10-31 | 2003-01-15 | 浙江大学 | Bellow sealing valve |
| CN1786602A (en) * | 2004-12-06 | 2006-06-14 | 三星电子株式会社 | Multi-air conditioning system and valve opening controlling method thereof |
| JP4385179B2 (en) * | 2004-03-10 | 2009-12-16 | 株式会社ニッキ | Electronically controlled throttle device |
-
2008
- 2008-11-06 CN CN200810173580.9A patent/CN101761689B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1310305A (en) * | 2000-01-21 | 2001-08-29 | 昭和电工株式会社 | Halogen corrosive gas valve and its producing method |
| CN2531214Y (en) * | 2001-10-31 | 2003-01-15 | 浙江大学 | Bellow sealing valve |
| JP4385179B2 (en) * | 2004-03-10 | 2009-12-16 | 株式会社ニッキ | Electronically controlled throttle device |
| CN1786602A (en) * | 2004-12-06 | 2006-06-14 | 三星电子株式会社 | Multi-air conditioning system and valve opening controlling method thereof |
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| CN101761689A (en) | 2010-06-30 |
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Address after: 312500 Shaoxing City, Zhejiang province Xinchang Qixing street under the Liquan Patentee after: Zhejiang three flower intelligent control Limited by Share Ltd Address before: 312500 Zhejiang County in Xinchang Province town of Liquan Patentee before: Zhejiang Sanhua Group Co., Ltd. |
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