CN111579154A - Fan vibration quantity measuring clamp - Google Patents
Fan vibration quantity measuring clamp Download PDFInfo
- Publication number
- CN111579154A CN111579154A CN202010641506.6A CN202010641506A CN111579154A CN 111579154 A CN111579154 A CN 111579154A CN 202010641506 A CN202010641506 A CN 202010641506A CN 111579154 A CN111579154 A CN 111579154A
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- China
- Prior art keywords
- base
- measuring
- fan
- measuring platform
- vibration
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- 229920000642 polymer Polymers 0.000 claims abstract description 26
- 229920001296 polysiloxane Polymers 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 12
- 238000002955 isolation Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 238000012938 design process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/14—Determining imbalance
- G01M1/16—Determining imbalance by oscillating or rotating the body to be tested
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention provides a fan vibration quantity measuring clamp which comprises a first base, a second base and a measuring platform, wherein the second base is arranged above the first base, a spring is arranged between the second base and the first base, the measuring platform is arranged above the second base, and a high polymer elastic column is arranged between the measuring platform and the second base. The invention can improve the accuracy of fan measurement.
Description
Technical Field
The invention relates to a fan detection device, in particular to a fan vibration quantity measuring clamp.
Background
It should be noted that the description in this section does not represent that it is prior art.
The vibration of the fan is the reflection of the dynamic balance effect of the fan blades, and if the vibration exceeds the standard requirement, the service life of the bearing is reduced and external equipment is affected, so that the vibration of the fan needs to be measured.
As shown in fig. 1, the fan vibration amount measuring jig includes a base 102, a supporting column 103 disposed on the base 102, and a measuring platform 104 disposed above the supporting column 103, wherein a spring 105 is disposed between the measuring platform 104 and the supporting column 103, a fan 201 to be measured is fixed on an upper surface of the measuring platform 104, and a vibration amount generated during rotation of the fan 201 is detected by a sensor 106, so that the vibration amount of the fan 201 is measured.
Under the unit volume, the vertical stiffness of spring is less, usually along with transverse stiffness also less, transverse stability when testing can weaken, make measuring platform sway easily, based on this, can be preferred to satisfy testing platform's transverse stability in conventional design process, if select the big spring of vertical stiffness as the vibration isolation component, then can lead to testing platform's natural resonant frequency to rise, the vibration isolation coefficient of high frequency channel descends, the dynamic rigidity of spring can rise and grow along with the frequency after exceeding the resonance region, also can cause the vibration isolation coefficient of high frequency channel to descend equally, so that when measuring platform does the forced vibration, can produce two phenomena: 1. weak high-frequency vibration energy of the fan to be measured is transmitted to the base on the measuring platform through the spring, so that measuring sensitivity is reduced; 2. high-frequency interference vibration from the ground is transmitted to the measuring platform through the base and the vibration isolation elements, so that unknown interference components are superposed in the vibration quantity.
The above phenomena may cause that the vibration data obtained by the measuring platform cannot reflect the vibration characteristics of the actually measured fan, especially the vibration characteristic measurement of the small high-speed fan.
Disclosure of Invention
In view of this, it is necessary to provide a fan vibration amount measuring jig which improves the accuracy of fan measurement.
The invention provides a fan vibration quantity measuring clamp which comprises a first base, a second base and a measuring platform, wherein the second base is arranged above the first base, a spring is arranged between the second base and the first base, the measuring platform is arranged above the second base, and a high polymer elastic column is arranged between the measuring platform and the second base.
Furthermore, the polymer elastic column body is silica gel.
Furthermore, the polymer elastic cylinder is a circular truncated cone.
Further, the measuring platform also comprises a supporting column used for enabling the measuring platform to reach a certain height.
Further, the support column is arranged between the first base and the second base, and the spring is connected with the support column.
Furthermore, the support column is arranged between the second base and the measuring platform, and the high polymer elastic column body is connected with the support column.
Further, the ratio of the weight of the second base to the sum of the weight of the measuring platform and the weight of the fan is not lower than 30%.
Further, the weight of the second base is the sum of the weights of the measuring platform and the fan.
Furthermore, a limiting rod is further arranged above the second base and extends to the measuring platform to limit the vibration of the measuring platform.
Furthermore, the limiting rod comprises a limiting groove, the periphery of the measuring platform is arranged in the limiting groove, and the periphery of the measuring platform can move within a certain range in the limiting groove.
According to the invention, the vibration energy of the low frequency band is isolated by the spring, and the vibration energy of the high frequency band is isolated by the polymer elastic cylinder, so that the vibration energy isolation effects are superposed, and the accuracy of fan measurement is improved.
Drawings
Fig. 1 is a schematic structural diagram of a fan vibration measurement jig of the related art.
Fig. 2 is a schematic structural diagram of a fan vibration amount measuring jig according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention. It is to be understood that the drawings are provided solely for the purposes of reference and illustration and are not intended as a definition of the limits of the invention. The connection relationships shown in the drawings are for clarity of description only and do not limit the manner of connection.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also be noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; either mechanically or electrically, and may be internal to both elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
It should be noted that in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be configured in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 2, an embodiment of the invention provides a fan vibration measurement fixture, which includes a first base 111, a second base 112, a supporting column 113, a measurement platform 114, a spring 115, an acceleration sensor 116, a limiting rod 117, and a polymer elastic column 118.
The second base 112 is disposed above the first base 111, the spring 115 is disposed between the second base 112 and the first base 111, the measuring platform 114 is disposed above the second base 112, and the polymer elastic cylinder 118 is disposed between the measuring platform 114 and the second base 112.
The spring 115 directly connects the first base 111 and the second base 112. The support column 113 is located measurement platform 114 and between the second base 112, be used for making measurement platform 114 reaches certain height so that measure fan vibration volume, and it includes first cylinder 1131 and second cylinder 1132, wherein, the bottom lug connection of first cylinder 1131 second base 112, first cylinder 1131 with second cylinder 1132 passes through polymer elastic cylinder 118 connects, the top lug connection of second cylinder 1132 measurement platform 114.
In other embodiments, the polymer elastic cylinder 118 may be directly connected to the second base 112 or directly connected to the measuring platform 114. In other embodiments, the supporting column 113 may be disposed between the first base 111 and the second base 112, and is connected to the spring 115.
The limiting rod 117 is disposed on the second base 112 and parallel to the supporting column 113, and is disposed at an outer side of the supporting column 113. The acceleration sensor 116 is disposed on the measuring platform 114, and is used for detecting a vibration amount of the fan 211 and the measuring platform 114.
The limiting rod 117 extends to the measuring platform 114 to limit the vibration of the measuring platform 114. Specifically, the limit rod 117 includes a limit groove 1171, the periphery of the measuring platform 114 is disposed in the limit groove 1171, and the periphery of the measuring platform 114 can move within a certain range in the limit groove 1171, so as to avoid exceeding the allowable displacement range of the polymer elastic cylinder 118 during the horizontal and vertical movements of the measuring platform 114 caused by vibration, and avoid damaging the polymer elastic cylinder 118.
The natural resonant frequency of the polymer elastic column 118 is higher than that of the spring 115, the filtering effect on low-frequency vibration energy is not as good as that of the spring 115, the spring 115 is arranged between the first base 111 and the second base 112, the polymer elastic column 118 is arranged between the measuring platform 114 and the second base 112, the polymer elastic column 118 has high rigidity and high damping in a low-frequency vibration range below the natural resonant frequency, has excellent transverse stability and suppresses the resonance vibration energy at the natural resonant frequency, the polymer elastic column 118 has low rigidity and low damping in a high-frequency vibration range above the natural resonant frequency, has the capability of isolating higher-frequency vibration energy relative to the spring 115, and combines the effect of the spring 115 on isolating low-frequency vibration energy, the vibration energy isolation effects are superposed, and the accuracy of the fan 211 measurement is improved.
In the present embodiment, the polymer elastic column 118 is preferably silica gel, which has a better isolation capability against high-frequency vibration energy. The polymer elastic cylinder 118 is preferably a circular truncated cone, the diameter of the top end of the polymer elastic cylinder is smaller, and the diameter of the bottom end of the polymer elastic cylinder is larger, so that the polymer elastic cylinder 118 having a circular truncated cone structure has better stability in the transverse direction than the polymer elastic cylinder 118 having a circular cylindrical shape.
The applicant has found that when the fan 211 is measured, the whole fixture has a resonance region, which causes a large measurement error if the frequency of the effective vibration energy on the measuring platform 114 is in the resonance region, if the weight ratio of the weight of the second base 112 to the total weight of the measuring platform 114 and the fan 211 is larger, the resonance region moves to a lower frequency, and if the weight ratio is smaller, the resonance region moves to a higher frequency, if the resonance region moves to a higher frequency, the frequency range of the effective vibration energy on the measuring platform is approached, and if the ratio of the weight of the second base 112 to the total weight of the measuring platform 114 and the fan 211 is greater than or equal to 30%, the resonance region can be completely avoided, the vibration isolation effect of the fixture is better, especially when the weight of the second base 112 is equal to the total weight of the measuring platform 114 and the fan 211, the vibration isolating effect can be considered, and the cost problem due to the weight and the space occupation problem due to the volume of the second base 112 can be considered.
Throughout the description and claims of this application, the words "comprise/comprises" and the words "have/includes" and variations of these are used to specify the presence of stated features, values, steps or components but do not preclude the presence or addition of one or more other features, values, steps, components or groups thereof.
Some features of the invention, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, certain features of the invention, which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable combination in different embodiments.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a fan vibration volume measuring jig, its characterized in that includes first base, second base and measuring platform, the second base is located first base top, the second base with be equipped with the spring between the first base, measuring platform locates second base top, measuring platform with be equipped with polymer elasticity cylinder between the second base.
2. The jig for measuring the amount of vibration of a fan as defined in claim 1, wherein the polymer elastic cylinder is silicone.
3. The jig for measuring the amount of vibration of a fan according to claim 1, wherein the polymer elastic cylinder is a circular truncated cone.
4. The fan vibration measuring jig according to claim 1, further comprising a support pillar for making the measuring platform a certain height.
5. The fan vibration amount measuring jig according to claim 4, wherein the support column is provided between the first base and the second base, and the spring is connected to the support column.
6. The jig for measuring fan vibration amount according to claim 4, wherein the support pillar is provided between the second base and the measuring platform, and the polymer elastic cylinder is connected to the support pillar.
7. The fan vibration amount measuring jig according to claim 4, wherein a ratio of the weight of the second base to the sum of the weights of the measuring platform and the fan is not less than 30%.
8. The fan vibration amount measuring jig according to claim 5, wherein the weight of the second base is the sum of the weight of the measuring platform and the weight of the fan.
9. The fan vibration amount measuring jig according to any one of claims 1 to 8, wherein a stopper rod is further provided above the second base, the stopper rod extending to the measuring platform to limit the measuring platform when vibrating.
10. The fan vibration amount measuring jig according to claim 9, wherein the stopper rod includes a stopper groove, a periphery of the measuring platform is provided in the stopper groove and the periphery of the measuring platform can move within a certain range in the stopper groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010641506.6A CN111579154A (en) | 2020-07-06 | 2020-07-06 | Fan vibration quantity measuring clamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010641506.6A CN111579154A (en) | 2020-07-06 | 2020-07-06 | Fan vibration quantity measuring clamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111579154A true CN111579154A (en) | 2020-08-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010641506.6A Pending CN111579154A (en) | 2020-07-06 | 2020-07-06 | Fan vibration quantity measuring clamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111579154A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI757995B (en) * | 2020-12-02 | 2022-03-11 | 財團法人金屬工業研究發展中心 | Vibration force measuring device |
-
2020
- 2020-07-06 CN CN202010641506.6A patent/CN111579154A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI757995B (en) * | 2020-12-02 | 2022-03-11 | 財團法人金屬工業研究發展中心 | Vibration force measuring device |
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