CN201425925Y - Return spring of air circuit breaker - Google Patents
Return spring of air circuit breaker Download PDFInfo
- Publication number
- CN201425925Y CN201425925Y CN2009200643532U CN200920064353U CN201425925Y CN 201425925 Y CN201425925 Y CN 201425925Y CN 2009200643532 U CN2009200643532 U CN 2009200643532U CN 200920064353 U CN200920064353 U CN 200920064353U CN 201425925 Y CN201425925 Y CN 201425925Y
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- spring
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- air circuit
- load
- steel wire
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Abstract
The utility model relates to a return spring of an air circuit breaker, which is composed of a cylindrical spring which is characterized in that: the steel wire diameter d of the cylindrical spring is4.3-4.7mm, the working coils are 5.5-6.5, the length L is 146-150mm, and outer diameter D is 48-52mm. on the premise of not changing the rigidity of the spring, the position of a working load point and loading size, the outer diameter and the free length L, by reducing the diameter of the steel wire and working coils, the compressible space of the spring is increased, thereby leading the positionof the working load point to be far away from the position of a lamming point as far as possible. After being detected by an applicant, the working load and solid load are 0.86 which is less than 0.9, the working stress is 747MPa, static strength safety factor is 1.36 which is more than or equal to 1.3, so as to be in accordance to the requirements of the static strength safety factor, the energyadsorption is 12544N.mm, and the adsorbed energy is 1/3 higher than the prior art, thereby being beneficial to buffering impact and greatly enhancing the reliability of the spring.
Description
Technical field
The utility model relates to a kind of air circuit, particularly a kind of recovery spring of air circuit.
Background technology
Air circuit is a most important electric component on railway electric locomotive and the motor train unit, and it has two effects greatly: the one, be used for connecting the high-tension circuit with disjunction locomotive or motor train unit, and be the power control switch of system; The 2nd, when locomotive or motor train unit break down, rapidly, safety, cut off general supply, protection operating personnel's personal safety and device security effectively.Therefore it has the dual-use function of control and protection.The recovery spring of its main disconnected arc control device is major parts.Circuit breaker is very easily refused branch and is refused to close, cut-off faults such as bad in the locomotive operation, the motorcycle safety reliability service is brought very big influence, reason is that the mechanical stress that each part of arc control device is produced in the main circuit breaker is bigger, air circuit enters arc control device by supporting the compressed air that comes on the porcelain vase, make moving contact to left movement, dynamic and static contact division.At this moment, the expansion and the contraction of gas flow, arc column in the air circuit, higher to contact action request in the arc control device, frequent contact disconnects, the closed mechanical stress that is produced is bigger, and the working stress that general main circuit breaker recovers spring is about about 590Mpa, and real work stress is greater than 700Mpa, do not reach corresponding requirements, be easy to generate fracture or lax so general main circuit breaker recovers spring, cause suspension of service, the locomotive accident takes place.It recovers spring is cylindrical spring, and material is for being generally 50CrVA, and it is 4.8mm that its specification is generally steel wire diameter d, the number of effective coils 10 circles, length L is 148mm, outer diameter D is 54.8mm, it is static load that the load kind is born by institute, Tensile strength δ b=1471Mpa, and its important technological parameters is:
1. rigidity P '=(9800 * 4.84)/50
3* 7.3) 5.7N/mm
2. also tight height H b=(10-0.5) * 4.8=45.6mm
3. also tight theoretical load Pb=(148-45.6) * 5.7=584N
Maximum working load P2=(148-49) * 5.7=564.3N
Press the spring design specification, spring maximum working load P2≤0.8 ~ 0.9Pb and tight load, and the maximum working load of above-mentioned spring is and the 0.966Pb of tight load, for undesirable.
4. the spring stress under maximum working load and the solid load
Maximum working load stress T2=(8 * 50 * 564.3)/(3.14 * 4.8
3)=650Mpa
Stress Tb=(8 * 50 * 584.0)/(3.14 * 4.8 when spring is also tight
3)=672.3Mpa
T2/δb＝650/1471＝0.44
Tb/δb＝672.3/1471＝0.457
Press the 50CrVA material, spring is at the maximum working stress T2≤590Mpa of II type load, ratio T2/ δ b≤0.4 of maximum working stress and Tensile strength, above two indexs all surpassed safe range.
5. static strength coefficient of safety
n＝(0.56×1471)/650＝1.267≤〔n〕≥1.3
Because above-mentioned spring is a static load, through the examination static strength, it is undesirable to calculate its coefficient of safety according to following formula.
This shows that there is following problem in the recovery spring of air circuit of the prior art:
1. the spring maximum working load does not conform to the relevant criterion requirement, and its position, working point has surpassed 95% of all deformation, and is not 20 ~ 80% of all deformation by Standard Selection, is no more than at most in 90% the scope.
2. when spring was subjected to static load, the static strength coefficient of safety was on the low side.
Because the position of live load point makes spring when being subjected to impact load near pressing and point, rigidity increases, and stress increases, and surpasses the yield limit of material, and its static load coefficient of safety is on the low side again.Reduce greatly the useful life of spring like this, even cause the unexpected fracture of spring or lax, cause the air circuit can't operate as normal, cause train air circuit arc control device to burst, locomotive can't normally be moved.
Therefore, the recovery spring of air circuit needs further to improve in the prior art.
Summary of the invention
The purpose of this utility model is to provide a kind of recovery spring of air circuit, and it is strong that it has a capacity of resisting impact load, and long service life can avoid locomotive because of recovering the advantage that spring breakage has an accident.
The technical solution of the utility model is:
A kind of recovery spring of air circuit, it is a cylindrical spring, it is characterized in that: the steel wire diameter d of described cylindrical spring is 4.3～4.7mm, the number of effective coils 5.5～6.5 circles.
As to further improvement of the utility model, the length L of described cylindrical spring is 146-150mm, and outer diameter D is 48～52mm.
The beneficial effects of the utility model are:
The utility model is not changing spring rate, under the position of live load point, payload, external diameter and the free height L prerequisite, by reducing the steel wire diameter and the number of effective coils, the compressible space of spring is increased, thereby the position that makes live load point as far as possible away from and the position of tightly putting.Detect through the applicant, live load and solid load are 0.86＜0.9, and working stress is 747Mpa, the static strength coefficient of safety is 1.36 〉=1.3 to meet the requirement of spring static strength coefficient of safety, energy be absorbed as 12544Nmm, the energy of its absorption is higher than 1/3 than prior art, helps relaxing impacting.The reliability of spring is strengthened greatly.
After testing, the utility model particular product performance parameters is as follows:
Position, working point: from also tightly putting 15.25mm
Live load and solid load: 0.86＜0.9 (meeting the requirements)
Working stress: 747Mpa
The static strength coefficient of safety: 1.36＞1.3 meet the requirements
The absorption of energy: 12544Nmm
The useful life of spring: 〉=10
6Inferior.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
Fig. 1 is a front view of the present utility model.
Among the figure: 1. steel wire
Embodiment
A kind of recovery spring of air circuit, it is the cylindrical spring 1 that the steel wire of 55CrSi is made for material, the steel wire diameter d of cylindrical spring 1 is 4.5mm, the number of effective coils 6 circles, the length L of cylindrical spring is 148mm, outer diameter D is 50mm.
Embodiment 2
A kind of recovery spring of air circuit, it is the cylindrical spring 1 that the steel wire of 55CrSi is made for material, the steel wire diameter d of cylindrical spring 1 is 4.3mm, the number of effective coils 5.5 circles, the length L of cylindrical spring is 146mm, outer diameter D is 48mm.
Embodiment 3
A kind of recovery spring of air circuit, it is the cylindrical spring 1 that the steel wire of 55CrSi is made for material, the steel wire diameter d of cylindrical spring 1 is 4.7mm, the number of effective coils 6.5 circles, the length L of cylindrical spring is 150mm, outer diameter D is 52mm.
Claims (3)
1, a kind of recovery spring of air circuit, it is a cylindrical spring, it is characterized in that: the steel wire diameter d of described cylindrical spring is 4.3～4.7mm, the number of effective coils 5.5～6.5 circles.
2, the recovery spring of air circuit according to claim 1 is characterized in that: described cylindrical spring length L is 146-150mm, and outer diameter D is 48～52mm.
3, the recovery spring of air circuit according to claim 2 is characterized in that: the steel wire diameter d of described cylindrical spring is 4.5mm, the number of effective coils 6 circles, and described cylindrical spring length L is 148mm, outer diameter D is 50mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200643532U CN201425925Y (en) | 2009-05-11 | 2009-05-11 | Return spring of air circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200643532U CN201425925Y (en) | 2009-05-11 | 2009-05-11 | Return spring of air circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201425925Y true CN201425925Y (en) | 2010-03-17 |
Family
ID=42025379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200643532U Expired - Fee Related CN201425925Y (en) | 2009-05-11 | 2009-05-11 | Return spring of air circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201425925Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107507441A (en) * | 2017-07-11 | 2017-12-22 | 赵妍 | A kind of solar traffic light |
-
2009
- 2009-05-11 CN CN2009200643532U patent/CN201425925Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107507441A (en) * | 2017-07-11 | 2017-12-22 | 赵妍 | A kind of solar traffic light |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100317 Termination date: 20140511 |