CN119223336B - An encoder suitable for extreme temperature environments - Google Patents
An encoder suitable for extreme temperature environments Download PDFInfo
- Publication number
- CN119223336B CN119223336B CN202411730955.2A CN202411730955A CN119223336B CN 119223336 B CN119223336 B CN 119223336B CN 202411730955 A CN202411730955 A CN 202411730955A CN 119223336 B CN119223336 B CN 119223336B
- Authority
- CN
- China
- Prior art keywords
- cavity
- annular
- temperature
- normal temperature
- sleeve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000009423 ventilation Methods 0.000 claims description 22
- 239000013307 optical fiber Substances 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 14
- 238000009413 insulation Methods 0.000 claims description 8
- 238000009434 installation Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000017525 heat dissipation Effects 0.000 description 4
- 239000003566 sealing material Substances 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/347—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells using displacement encoding scales
- G01D5/3473—Circular or rotary encoders
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
- H05K7/20145—Means for directing air flow, e.g. ducts, deflectors, plenum or guides
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Optical Transform (AREA)
Abstract
本发明涉及编码器相关技术领域，公开了一种适用极端温度环境的编码器，包括外壳和密封连接在外壳开口处的端盖，端盖的中心开设通孔，在通孔内转动设置第一轴套，第一轴套的伸入外壳内并连接有第二轴套，端盖具有第一常温腔，第一常温腔内设置激光发射件，外壳的内腔设置隔温环形筒，隔温环形筒具有环形腔，在环形腔的环形开口处密封设置透明环形盖，透明环形盖将外壳的内腔分隔为耐温腔和第二常温腔，耐温腔位于第一常温腔和第二常温腔之间，本装置切换到抗低温能力时，启动内循环，第一常温腔内部分气体通过进风口、流经加热电阻丝，并通过第二出风口回流到负压间隙内，热气在第一常温腔和第二常温腔内往复循环，为电子元件提供良好的工作温度。
The present invention relates to the technical field related to encoders, and discloses an encoder suitable for extreme temperature environments, including a shell and an end cover sealed and connected to an opening of the shell, a through hole is provided in the center of the end cover, a first shaft sleeve is rotatably arranged in the through hole, the first shaft sleeve extends into the shell and is connected to a second shaft sleeve, the end cover has a first normal temperature cavity, a laser emitting component is arranged in the first normal temperature cavity, a temperature insulating annular cylinder is arranged in the inner cavity of the shell, the temperature insulating annular cylinder has an annular cavity, a transparent annular cover is sealed and arranged at the annular opening of the annular cavity, the transparent annular cover separates the inner cavity of the shell into a temperature-resistant cavity and a second normal temperature cavity, the temperature-resistant cavity is located between the first normal temperature cavity and the second normal temperature cavity, when the device switches to low temperature resistance, the internal circulation is started, part of the gas in the first normal temperature cavity passes through the air inlet, flows through the heating resistor wire, and flows back to the negative pressure gap through the second air outlet, the hot gas circulates back and forth in the first normal temperature cavity and the second normal temperature cavity, providing a good working temperature for the electronic components.
Description
Technical Field
The invention belongs to the technical field of encoders, and particularly relates to an encoder suitable for an extreme temperature environment.
Background
The photoelectric encoder is a sensor for converting mechanical geometric displacement on an output shaft into pulse or digital quantity through photoelectric conversion, realizes conversion from displacement to digital by utilizing a grating diffraction principle, mainly comprises a code disc, a light-emitting element and a photosensitive element, is widely applied to various industrial automation systems and is used for measuring rotation angles or positions, detecting the rotation angles or positions by emitting light rays and receiving reflected light rays, and can receive and process generated electric signals by a control system to realize real-time monitoring and control of rotation speeds.
The photoelectric encoder is an angle measuring device which converts space angle information into digital information, however, the current photoelectric encoder is at most in the range of-40-100 ℃, but has the defects of extremely large temperature difference, microwave radiation, electromagnetic field interference and the like in environments such as antarctic drilling, deep wells in ten thousand meters, aerospace and the like, and the requirements are not satisfied. Therefore, it is necessary to study the structure and material of the code wheel of the photoelectric encoder, the material and sealing material of the sensor housing, the structure of the illuminant and the light path receiving component, the temperature resistance of the material, the transmission mode of the circuit system and the data, etc. in the high and low temperature environment, the following technical problems exist in the conventional photoelectric encoder:
the existing photoelectric encoder is not provided with any heat preservation mechanism, is limited by materials and structures, and can deform, stress strain and dissolve in a high-low temperature environment, so that the precision and normal operation of the encoder are affected.
Accordingly, in view of the above, research and improvement on the existing structure and the existing defects are performed, and an encoder suitable for an extreme temperature environment is provided, so as to achieve the purpose of more practicability and value.
Disclosure of Invention
The present invention provides an encoder adapted to an extreme temperature environment that overcomes the above-mentioned drawbacks of the prior art.
The invention discloses a coder suitable for an extreme temperature environment, which is realized by the following specific technical means: an encoder suitable for extreme temperature environment comprises a shell and an end cover which is connected with an opening of the shell in a sealing way, wherein a through hole is formed in the center of the end cover, a first shaft sleeve is arranged in the through hole in a rotating way, the first shaft sleeve stretches into the shell and is connected with a second shaft sleeve, the end cover is provided with a first normal temperature cavity, a laser emitting part is arranged in the first normal temperature cavity, the inner cavity of the shell is provided with a heat insulation annular cylinder which is provided with an annular cavity, a transparent annular cover is arranged at the annular opening of the annular cavity in a sealing way, the inner cavity of the shell is divided into a temperature resistant cavity and a second normal temperature cavity by the transparent annular cover, the temperature resistant cavity is positioned between the first normal temperature cavity and the second normal temperature cavity, a coded disc is arranged in the temperature resistant cavity, an inner ring of the coded disc is fixedly sleeved on the first shaft sleeve, a light emitting end of the laser emitting part is connected with an optical fiber, the optical fiber extends from the first normal temperature cavity to the temperature resistant cavity, the optical fiber is close to the end part of the code wheel, an annular circuit board is arranged in a second normal temperature cavity, the first normal temperature cavity is provided with an annular opening facing the first shaft sleeve, the diameter of the first shaft sleeve is expanded at the annular opening to form an annular convex body, the first shaft sleeve is provided with a first central cavity, an air outlet groove is arranged in the annular convex body, the air outlet groove is used for communicating the first central cavity with the first normal temperature cavity, a heating resistance wire is arranged in the wall body of the first normal temperature cavity, one side of the second normal temperature cavity facing the second shaft sleeve is provided with a first air outlet, the second shaft sleeve is provided with a second central cavity communicated with the first central cavity, the wall body of the second central cavity is provided with an air inlet, the diameter of the second shaft sleeve at the air inlet is smaller than the diameter of the first shaft sleeve at the annular convex body, the air inlet is communicated with the first air outlet, the wall body of the first normal temperature cavity is provided with a first flow passage, a second runner is formed in the wall body of the second normal-temperature cavity and is communicated with the first runner.
Further technical scheme, the inner wall fixed connection spacing ring in first normal atmospheric temperature chamber, the spacing ring extends towards annular convex body to the spacing ring has interior conical surface, and annular convex body has with interior conical surface complex outer conical surface, forms the negative pressure clearance between interior conical surface and the outer conical surface, has the cavity that holds the heating resistance wire in the spacing ring, and air intake and second air outlet are seted up to the wall body of cavity, and the air intake communicates with first normal atmospheric temperature chamber, and second air outlet communicates with the negative pressure clearance.
Further technical scheme sets up the center pin in the first center chamber, form the air current clearance between center pin and the first center chamber, the one end of first axle sleeve extends to the outside of shell and fixed cover establishes annular dish, annular dish has centrifugal air exit, set up the first ventilation recess of intercommunication centrifugal air exit and first center chamber on the first axle sleeve, the center pin is located the fixed switching open loop that sets up in position of first ventilation recess, switching open loop has the second ventilation recess, switching open loop rotates with the center pin in order to seal or open first ventilation recess, the diameter of annular dish is greater than the diameter of annular convex body.
Further technical scheme, the center pin passes first central chamber and continues to stretch into the second central intracavity, and the air inlet blind hole is seted up to the one end of center pin, and the ventilation hole is seted up to the wall of air inlet blind hole, and the ventilation hole communicates air inlet blind hole and second central chamber, and the opening intercommunication external atmosphere of air inlet blind hole, the fixed afterbody sleeve that sets up in the second central chamber, afterbody telescopic inner wall is sunken in order to form the arc recess, and the center pin rotates in the afterbody sleeve in order to make the ventilation hole align the arc recess or make the arc recess stagger of ventilation hole.
Further technical scheme, the outside of center pin is fixed to be set up the slider, and the second sleeve has the spacing inslot, and the slider is limited at the spacing inslot, and center pin and first axle sleeve threaded connection, the one end that the end cover was kept away from to the shell sets up spacing telescopic link, and the axle head of spacing telescopic link can support the second sleeve in order to restrict the rotation of second sleeve, still sets up the elasticity reset piece that promotes the slider and reset in the spacing inslot.
According to a further technical scheme, a head sleeve is arranged at the opening of the first shaft sleeve, the head sleeve is provided with first internal threads, a central shaft is provided with first external threads matched with the first internal threads, a tail sleeve is fixedly arranged at the opening of the second shaft sleeve, the tail sleeve is provided with second internal threads, and the central shaft is provided with second external threads matched with the second internal threads.
Further technical scheme still includes temperature sensor and control unit, and temperature sensor installs in first normal atmospheric temperature intracavity, and control unit sets up on annular circuit board, and temperature sensor's signal output part is connected with control unit's signal receiving terminal electricity, and control unit's signal output part is connected with spacing telescopic link electricity.
Further technical scheme, the bottom of thermal-insulated annular section of thick bamboo is fixed to be set up a plurality of spliced poles, and the tip and the annular circuit board of spliced pole are connected in order to make annular circuit board unsettled ground connect in second normal atmospheric temperature intracavity, and second normal atmospheric temperature intracavity wall sets up the heat preservation, and the inner wall in first normal atmospheric temperature chamber sets up the heat preservation.
Further technical scheme, the through-hole department at end cover center outwards protrudes and forms the bearing installation shell, sets up head bearing in the bearing installation shell, and first axle sleeve passes through head bearing's inner ring, sets up sealing gasket between head bearing and the inner wall of bearing installation shell, and the tip of spacing ring is close to head bearing and extends in order to form the butt portion, and the butt portion sets up sealing gasket with the part of head bearing butt.
According to a further technical scheme, the inner wall of the shell is provided with an annular groove, the tail bearing is arranged in the annular groove, the second shaft sleeve stretches into the inner ring of the tail bearing and is fixedly connected with the inner ring of the tail bearing, and a sealing ring is arranged at the opening of the annular groove.
Compared with the prior art, the invention has the following beneficial effects:
According to the invention, through setting the internal circulation and the external circulation, the device can adapt to the working conditions of high temperature and low temperature, when the device is switched to the low temperature resistance, only the internal circulation is started, the first shaft sleeve is driven by the central shaft to rotate at high speed, the first shaft sleeve drives the annular convex body to rotate, the gas in the air outlet groove is subjected to the centrifugal effect due to the larger diameter of the annular convex body, the gas in the air outlet groove has the tendency of flowing outwards into the first normal temperature cavity, the gas in the second normal temperature cavity is pumped into the first normal temperature cavity through the first central cavity, and the gas in the first normal temperature cavity is complemented into the second normal temperature cavity through the first flow channel and the second flow channel in sequence, so that the complete internal circulation is formed, and the gas in the first normal temperature cavity is heated by the heating resistance wire in the circulation process, so that the temperature in the first normal temperature cavity and the second normal temperature cavity is kept to be close to the normal temperature, and the effect of resisting low temperature is achieved; the annular convex body rotates at a high speed, the air and the surface of the annular convex body have certain viscosity, the rotation of the annular convex body can drive partial gas in the negative pressure gap to flow out towards the first normal temperature cavity, negative pressure is formed in the negative pressure gap, under the action of the negative pressure, partial gas in the first normal temperature cavity flows through the air inlet and the heating resistance wire and flows back into the negative pressure gap through the second air outlet, a heating cycle is completed, hot gas circulates back and forth in the first normal temperature cavity and the second normal temperature cavity, good working temperature is provided for electronic elements, the temperature in the temperature resistant cavity is influenced by the first normal temperature cavity and the second normal temperature cavity at two sides, the temperature can also be adaptively improved, and the temperature can also be adaptively improved by arranging the temperature resistant cavity and arranging the optical fiber and the code disc with low temperature resistance in the temperature resistant cavity, so that the volume of the cavity for heating can be reduced, and the energy consumption is reduced.
When the device is switched to a heat dissipation state, the internal circulation and the external circulation are started simultaneously, the first shaft sleeve drives the annular disc to rotate at a high speed, the gas is pumped outwards under the centrifugal action of the gas in the centrifugal air outlet, the external gas sequentially passes through the air inlet blind hole, the vent hole, the arc-shaped groove, the first central cavity, the second vent groove, the first vent groove and the centrifugal air outlet, flowing gas is formed in the first central cavity, the air flow path is the external circulation, meanwhile, the heating resistance wire cuts off the power supply, the internal circulation between the first normal temperature cavity and the second normal temperature cavity is also synchronously performed, and the internal circulation and the external circulation share the same channel, namely the first central cavity and the second central cavity, so that cold air which is externally supplemented to the first central cavity and the second central cavity can flow through the internal circulation to cool, and hot air which flows into the second central cavity from the air inlet can also be discharged to the outside through the first central cavity and the centrifugal air outlet, so that a good heat dissipation function is realized.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive effort for a person skilled in the art.
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a side view of the present invention at a connector;
FIG. 3 is an isometric three-dimensional schematic of the present invention;
FIG. 4 is a cross-sectional view of A-A of FIG. 2;
FIG. 5 is an enlarged partial schematic view of FIG. 4;
FIG. 6 is a schematic diagram of the path of the gas internal circulation in the present invention;
FIG. 7 is an enlarged schematic view of the structure at the annular boss of the present invention;
FIG. 8 is a schematic diagram of the path of the gas in the present invention when the gas inner and outer loops are co-acting;
FIG. 9 is a cross-sectional view taken at B-B of FIG. 4;
FIG. 10 is a cross-sectional view of the present invention at a limiting groove;
fig. 11 is a cross-sectional view of the present invention at an arcuate recess.
Reference numerals illustrate:
10 outer shell, 11 connecting frame, 13 locking lug, 14 fixing lug, 16 end cover, 17 installation vertical face, 18 locking bolt, 19 tail bearing, 20 head bearing, 21 first shaft sleeve, 22 second shaft sleeve, 23 central shaft, 25 heat insulation annular cylinder, 26 transparent annular cover, 27 first normal temperature cavity, 28 temperature resistant cavity, 29 second normal temperature cavity, 30 laser emitting piece, 31 optical fiber, 32 transparent mirror, 33 code disc, 34 dividing rule, 35 photosensitive element, 37 annular circuit board, 40 limit groove, 42 sealing ring, 43 first runner, 44 second runner, 45 first air outlet, 46 air inlet, 47 first central cavity, 48 air outlet groove, 49 annular convex body, 50 air inlet, 51 heating resistance wire, 52 limit ring, 55 negative pressure gap, 56 second air outlet, 57 annular disc, 58 centrifugal air outlet, 59 head sleeve, 60 first groove, 61 second air inlet groove, 62 switching open loop, 63 air inlet blind hole, 64 vent, 65 tail sleeve, 66 arc groove, 67 slide block, 70 temperature sensor, 71 limit telescopic rod, 72 second central cavity, 73 connecting column.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings and examples. The following examples are illustrative of the invention but are not intended to limit the scope of the invention.
In the description of the present invention, unless otherwise indicated, the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", etc., refer to the orientation or positional relationship as indicated on the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and manipulated in a specific orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected" and "connected" are to be construed broadly, and for example, they may be fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1 to 11, an encoder suitable for extreme temperature environment comprises a housing 10 and an end cover 16 hermetically connected to an opening of the housing 10, wherein a through hole is formed in the center of the end cover 16, a first shaft sleeve 21 is rotatably arranged in the through hole, the first shaft sleeve 21 stretches into the housing 10 and is connected with a second shaft sleeve 22, the end cover 16 is provided with a first normal temperature cavity 27, a laser emitting part 30 is arranged in the first normal temperature cavity 27, a heat insulation annular cylinder 25 is arranged in an inner cavity of the housing 10, the heat insulation annular cylinder 25 is provided with an annular cavity, a transparent annular cover 26 is hermetically arranged at the annular opening of the annular cavity, the inner cavity of the housing 10 is divided into a heat resistant cavity 28 and a second normal temperature cavity 29 by the transparent annular cover 26, the heat resistant cavity 28 is positioned between the first normal temperature cavity 27 and the second normal temperature cavity 29, a code wheel 33 is arranged in the heat resistant cavity 28, an inner ring of the code wheel 33 is fixedly sleeved on the first shaft sleeve 21, the light emitting end of the laser emitting member 30 is connected with an optical fiber 31, the optical fiber 31 extends from a first room temperature cavity 27 to a temperature resistant cavity 28, the end of the optical fiber 31 close to the code wheel 33 is provided with a transparent mirror 32, an annular circuit board 37 is arranged in a second room temperature cavity 29, the first room temperature cavity 27 is provided with an annular opening facing the first shaft sleeve 21, the diameter of the first shaft sleeve 21 expands at the annular opening to form an annular convex body 49, the first shaft sleeve 21 is provided with a first central cavity 47, an air outlet groove 48 is arranged in the annular convex body 49, the air outlet groove 48 communicates the first central cavity 47 with the first room temperature cavity 27, a heating resistance wire 51 is arranged in the wall of the first room temperature cavity 27, a first air outlet 45 is arranged at one side of the second room temperature cavity 29 facing the second shaft sleeve 22, the second shaft sleeve 22 is provided with a second central cavity 72 communicated with the first central cavity 47, the wall of the second central cavity 72 is provided with an air outlet 46, the diameter of the second shaft sleeve 22 at the air guiding opening 46 is smaller than that of the first shaft sleeve 21 at the annular convex body 49, the air guiding opening 46 is communicated with the first air outlet 45, the wall body of the first normal temperature cavity 27 is provided with a first flow passage 43, the wall body of the second normal temperature cavity 29 is provided with a second flow passage 44, and the second flow passage 44 is communicated with the first flow passage 43.
In the present embodiment, the code wheel 33 is made of high-purity high-temperature resistant quartz, the working temperature of the code wheel is maintained at-100 ℃ to 1100 ℃, the optical fiber 31 is made of sapphire optical fiber as a light guide material, the temperature is resistant to-100 ℃ to 1000 ℃,
The laser emitting part 30 adopts 450-460 nm collimated laser, a sealing material is arranged at the joint of the device and is used for sealing the first normal temperature cavity 27, the temperature resistant cavity 28 and the second normal temperature cavity 29, and the sealing material adopts polyimide materials, and the temperature resistant range of the sealing material is-200-400 ℃.
The annular circuit board 37 is provided with a photosensitive element 35, an index scale 34 is further arranged between the photosensitive element 35 and the code wheel 33, the side face of the end cover 16 is provided with mutually opposite mounting vertical faces 17, the end cover 16 is further provided with a connecting frame 11, the side edges of the connecting frame 11 are symmetrically provided with fixing lugs 14, two symmetrical fixing lugs 14 are clamped outside the mounting vertical faces 17, the fixing lugs 14 are locked on the mounting vertical faces 17 by adopting locking bolts 18, and the side edges of the connecting frame 11 are further provided with two opposite locking lugs 13.
Preferably, the inner wall of the first room temperature cavity 27 is fixedly connected with a limiting ring 52, the limiting ring 52 extends towards the annular convex body 49, the limiting ring 52 is provided with an inner conical surface, the annular convex body 49 is provided with an outer conical surface matched with the inner conical surface, a negative pressure gap 55 is formed between the inner conical surface and the outer conical surface, a cavity for accommodating the heating resistor wire 51 is formed in the limiting ring 52, an air inlet 50 and a second air outlet 56 are formed in the wall of the cavity, the air inlet 50 is communicated with the first room temperature cavity 27, and the second air outlet 56 is communicated with the negative pressure gap 55.
Preferably, the central shaft 23 is disposed in the first central cavity 47, an air flow gap is formed between the central shaft 23 and the first central cavity 47, one end of the first shaft sleeve 21 extends to the outside of the casing 10 and is fixedly sleeved with the annular disc 57, the annular disc 57 is provided with a centrifugal air outlet 58, the first shaft sleeve 21 is provided with a first ventilation groove 60 which is communicated with the centrifugal air outlet 58 and the first central cavity 47, a switching open loop 62 is fixedly disposed at the position of the central shaft 23 located in the first ventilation groove 60, the switching open loop 62 is provided with a second ventilation groove 61, the switching open loop 62 rotates along with the central shaft 23 to close or open the first ventilation groove 60, and the diameter of the annular disc 57 is larger than that of the annular convex body 49.
Preferably, the central shaft 23 passes through the first central cavity 47 and continues to extend into the second central cavity 72, the air inlet blind hole 63 is formed at one end of the central shaft 23, the vent hole 64 is formed in the wall body of the air inlet blind hole 63, the air inlet blind hole 63 is communicated with the second central cavity 72 through the vent hole 64, the opening of the air inlet blind hole 63 is communicated with the outside atmosphere, the tail sleeve 65 is fixedly arranged in the second central cavity 72, the inner wall of the tail sleeve 65 is recessed to form an arc-shaped groove 66, and the central shaft 23 rotates in the tail sleeve 65 to enable the vent hole 64 to be opposite to the Ji Huxing groove 66 or enable the vent hole 64 to be staggered from the arc-shaped groove 66.
Preferably, the slide block 67 is fixedly arranged on the outer side of the central shaft 23, the second shaft sleeve 22 is provided with a limit groove 40, the slide block 67 is limited in the limit groove 40, the central shaft 23 is in threaded connection with the first shaft sleeve 21, a limit telescopic rod 71 is arranged at one end of the shell 10 far away from the end cover 16, the shaft end of the limit telescopic rod 71 can prop against the second shaft sleeve 22 to limit the rotation of the second shaft sleeve 22, and an elastic reset piece for pushing the slide block 67 to reset is further arranged in the limit groove 40.
Preferably, the opening of the first shaft sleeve 21 is provided with a head sleeve 59, the head sleeve 59 is provided with a first internal thread, the central shaft 23 is provided with a first external thread matched with the first internal thread, the opening of the second shaft sleeve 22 is fixedly provided with a tail sleeve 65, the tail sleeve 65 is provided with a second internal thread, and the central shaft 23 is provided with a second external thread matched with the second internal thread.
Preferably, the temperature sensor 70 and the control unit are further included, the temperature sensor 70 is installed in the first normal temperature cavity 27, the control unit is arranged on the annular circuit board 37, the signal output end of the temperature sensor 70 is electrically connected with the signal receiving end of the control unit, and the signal output end of the control unit is electrically connected with the limiting telescopic rod 71.
Preferably, the bottom of the thermal insulation annular cylinder 25 is fixedly provided with a plurality of connecting columns 73, the end parts of the connecting columns 73 are connected with the annular circuit board 37 so that the annular circuit board 37 is connected in the second normal temperature cavity 29 in a suspending manner, the inner wall of the second normal temperature cavity 29 is provided with an insulating layer, and the inner wall of the first normal temperature cavity 27 is provided with an insulating layer.
Preferably, the through hole in the center of the end cover 16 protrudes outwards to form a bearing installation shell, the head bearing 20 is arranged in the bearing installation shell, the first shaft sleeve 21 passes through the inner ring of the head bearing 20, a sealing gasket is arranged between the head bearing 20 and the inner wall of the bearing installation shell, the end part of the limiting ring 52 is close to the head bearing 20 and extends to form an abutting part, and the abutting part is provided with the sealing gasket with the abutting part of the head bearing 20.
Preferably, the inner wall of the housing 10 has an annular groove in which the tail bearing 19 is disposed, the second sleeve 22 extends into the inner ring of the tail bearing 19 and is fixedly connected with the inner ring of the tail bearing 19, and a sealing ring 42 is disposed at the opening of the annular groove.
The specific application method of the invention comprises the following steps:
The connecting frame 11 is installed on equipment to be tested, for example, the connecting frame 11 and the shell 10 are installed at the tail part of a motor by using bolts, the shaft of the motor is fixedly connected with the central shaft 23 of the device coaxially, the motor is started and drives the central shaft 23 to rotate, the central shaft 23 drives the code wheel 33 to rotate in the temperature resistant cavity 28 through the first shaft sleeve 21, the laser emitting piece 30 is started and emits laser, the laser passes through the code wheel 33 through the optical fiber 31 and the light-transmitting mirror 32, and the laser further enters the second normal-temperature cavity 29 through the transparent annular cover 26 and is finally detected by the photosensitive element 35 so as to realize the basic function of the encoder.
The device has low temperature resistance, and the specific working process is as follows:
When the ambient temperature is lower than a set value, the control unit sends a signal to the limiting telescopic rod 71, the limiting telescopic rod 71 stretches to abut against the first shaft sleeve 21, the central shaft 23 continues to rotate under the drive of the motor, the central shaft 23 and the first shaft sleeve 21 rotate relatively, so that the first ventilation groove 60 and the second ventilation groove 61 are staggered, the communication between the centrifugal air outlet 58 and the first central cavity 47 is cut off, the ventilation hole 64 and the arc-shaped groove 66 are also staggered synchronously, the communication between the second central cavity 72 and the air inlet blind hole 63 is cut off, and thus the communication between the first central cavity 47 and the outside is completely cut off, so that preparation is made for subsequent internal heating circulation.
The first shaft sleeve 21 rotates at a high speed under the drive of the central shaft 23, the first shaft sleeve 21 drives the annular convex body 49 to rotate, the air in the air outlet groove 48 is subjected to centrifugal action due to the larger diameter of the annular convex body 49, the air in the second normal temperature cavity 29 is pumped into the first normal temperature cavity 27 through the first central cavity 47, the air in the first normal temperature cavity 27 is complemented into the second normal temperature cavity 29 through the first flow channel 43 and the second flow channel 44 in sequence, so that a complete internal circulation is formed, the air in the first normal temperature cavity 27 is heated by the heating resistance wire 51 in the circulation process, and the temperature in the first normal temperature cavity 27 and the second normal temperature cavity 29 is kept to be close to the normal temperature, so that the effect of resisting low temperature is achieved.
As shown in fig. 6, the annular convex body 49 rotates at a high speed, the air and the surface of the annular convex body 49 have certain viscosity, the rotation of the annular convex body 49 can drive the gas in the negative pressure gap 55 to flow out towards the first normal temperature chamber 27, negative pressure is formed in the negative pressure gap 55, and under the action of the negative pressure, part of the gas in the first normal temperature chamber 27 flows through the heating resistor wire 51 through the air inlet 50 and the second air outlet 56 and flows back into the negative pressure gap 55, so that a heating cycle is completed.
The device has high-temperature heat dissipation capacity at the same time, and the specific working process is as follows:
The temperature sensor 70 detects the ambient temperature, when the ambient temperature is higher than the set value, the control unit sends a signal to the limiting telescopic rod 71, the limiting telescopic rod 71 stretches to be separated from the first shaft sleeve 21, the sliding block 67 drives the central shaft 23 to rotate relative to the second shaft sleeve 22 to reset under the pushing of the elastic reset piece, so that the first ventilation groove 60 and the second ventilation groove 61 are aligned, the centrifugal air outlet 58 is communicated with the first central cavity 47, the ventilation hole 64 and the arc-shaped groove 66 are also synchronously aligned, and the second central cavity 72 is communicated with the air inlet blind hole 63.
The first shaft sleeve 21 drives the annular disc 57 to rotate at a high speed, the air in the centrifugal exhaust port 58 is subjected to centrifugal action, the air is pumped outwards, the external air sequentially passes through the air inlet blind hole 63, the vent hole 64, the arc-shaped groove 66, the first central cavity 47, the second air inlet groove 61, the first air inlet groove 60 and the centrifugal exhaust port 58, flowing air is formed in the first central cavity 47, the air flow path is an external circulation, meanwhile, the heating resistance wire 51 cuts off the power supply, the internal circulation between the first normal temperature cavity 27 and the second normal temperature cavity 29 is also synchronously performed, the internal circulation and the external circulation share the same channel, namely the first central cavity 47 and the second central cavity 72, so that cold air which is externally supplemented to the first central cavity 47 and the second central cavity 72 can flow through the internal circulation to cool, and hot air which flows into the second central cavity 72 from the air inlet 46 can also be discharged to the outside through the first central cavity 47 and the centrifugal exhaust port 58, so that a good heat dissipation function is realized.
The embodiments of the invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (10)
1. An encoder suitable for extreme temperature environment, includes shell and sealing connection in the end cover of shell opening part, its characterized in that: the center of the end cover is provided with a through hole, a first shaft sleeve is rotationally arranged in the through hole, the first shaft sleeve stretches into the shell and is connected with a second shaft sleeve, the end cover is provided with a first normal temperature cavity, a laser emitting part is arranged in the first normal temperature cavity, the inner cavity of the shell is provided with a heat insulation annular cylinder, the heat insulation annular cylinder is provided with an annular cavity, the annular opening of the annular cavity is hermetically provided with a transparent annular cover, the inner cavity of the shell is divided into a temperature resistant cavity and a second normal temperature cavity by the transparent annular cover, the temperature resistant cavity is positioned between the first normal temperature cavity and the second normal temperature cavity, a coded disc is arranged in the temperature resistant cavity, an inner ring of the coded disc is fixedly sleeved on the first shaft sleeve, a light emitting end of the laser emitting part is connected with an optical fiber, the optical fiber extends from the first normal temperature cavity to the temperature resistant cavity, the optical fiber is close to the end part of the code wheel, an annular circuit board is arranged in the second normal temperature cavity, the first normal temperature cavity is provided with an annular opening facing the first shaft sleeve, the diameter of the first shaft sleeve expands at the annular opening to form an annular convex body, the first shaft sleeve is provided with a first central cavity, an air outlet groove is arranged in the annular convex body, the air outlet groove communicates the first central cavity with the first normal temperature cavity, a heating resistance wire is arranged in the wall of the first normal temperature cavity, a first air outlet is arranged on one side of the second normal temperature cavity facing the second shaft sleeve, the second shaft sleeve is provided with a second central cavity communicated with the first central cavity, an air inlet is arranged on the wall of the second central cavity, the diameter that the second sleeve is located the induced air mouth department is less than the diameter that the first sleeve is located annular convex body department, induced air mouth intercommunication first air outlet, first runner is seted up to the wall in first normal atmospheric temperature chamber, the second runner is seted up to the wall in second normal atmospheric temperature chamber, the second runner with first runner intercommunication.
2. The encoder of claim 1, wherein the inner wall of the first room temperature chamber is fixedly connected with a limiting ring, the limiting ring extends towards the annular convex body, the limiting ring is provided with an inner conical surface, the annular convex body is provided with an outer conical surface matched with the inner conical surface, a negative pressure gap is formed between the inner conical surface and the outer conical surface, the limiting ring is provided with a cavity for accommodating a heating resistance wire, the wall body of the cavity is provided with an air inlet and a second air outlet, the air inlet is communicated with the first room temperature chamber, and the second air outlet is communicated with the negative pressure gap.
3. The encoder of claim 1, wherein a central shaft is disposed in the first central cavity, an air flow gap is formed between the central shaft and the first central cavity, one end of the first shaft sleeve extends to the outside of the housing and is fixedly sleeved with an annular disc, the annular disc is provided with a centrifugal air outlet, a first ventilation groove communicated with the centrifugal air outlet and the first central cavity is formed in the first shaft sleeve, a switching open loop is fixedly arranged at a position of the central shaft located in the first ventilation groove, the switching open loop is provided with a second ventilation groove, the switching open loop rotates along with the central shaft to close or open the first ventilation groove, and the diameter of the annular disc is larger than that of the annular convex body.
4. An encoder suitable for extreme temperature environments according to claim 3 wherein said central shaft extends through said first central cavity and continues to extend into said second central cavity, an air inlet blind hole is formed in one end of said central shaft, a vent hole is formed in a wall of said air inlet blind hole, said vent hole communicates said air inlet blind hole with said second central cavity, an opening of said air inlet blind hole communicates with the outside atmosphere, a tail sleeve is fixedly disposed in said second central cavity, an inner wall of said tail sleeve is recessed to form an arc-shaped groove, and said central shaft rotates in said tail sleeve to align said vent hole with said arc-shaped groove or stagger said vent hole from said arc-shaped groove.
5. The encoder of claim 4, wherein a sliding block is fixedly arranged on the outer side of the central shaft, the second shaft sleeve is provided with a limiting groove, the sliding block is limited in the limiting groove, the central shaft is in threaded connection with the first shaft sleeve, a limiting telescopic rod is arranged at one end of the shell, which is far away from the end cover, the shaft end of the limiting telescopic rod can prop against the second shaft sleeve to limit the rotation of the second shaft sleeve, and an elastic reset piece for pushing the sliding block to reset is further arranged in the limiting groove.
6. An encoder for an extreme temperature environment as defined in claim 5, wherein a head sleeve is mounted at the opening of said first sleeve, said head sleeve has a first internal thread, said central shaft has a first external thread mated with said first internal thread, said tail sleeve is fixedly mounted at the opening of said second sleeve, said tail sleeve has a second internal thread, and said central shaft has a second external thread mated with said second internal thread.
7. The encoder for extreme temperature environments according to claim 5, further comprising a temperature sensor and a control unit, wherein the temperature sensor is installed in the first normal temperature cavity, the control unit is arranged on the annular circuit board, a signal output end of the temperature sensor is electrically connected with a signal receiving end of the control unit, and a signal output end of the control unit is electrically connected with the limiting telescopic rod.
8. The encoder of claim 1, wherein a plurality of connecting columns are fixedly arranged at the bottom of the heat insulation annular cylinder, the end parts of the connecting columns are connected with the annular circuit board so that the annular circuit board is connected in the second normal-temperature cavity in a suspending manner, an insulating layer is arranged on the inner wall of the second normal-temperature cavity, and an insulating layer is arranged on the inner wall of the first normal-temperature cavity.
9. An encoder suitable for extreme temperature environments according to claim 2 wherein the through hole in the center of the end cover protrudes outwards to form a bearing mounting shell, a head bearing is arranged in the bearing mounting shell, the first shaft sleeve passes through the inner ring of the head bearing, a sealing gasket is arranged between the head bearing and the inner wall of the bearing mounting shell, the end part of the limiting ring extends close to the head bearing to form an abutting part, and the abutting part is provided with the sealing gasket.
10. The encoder of claim 1, wherein the inner wall of the housing has an annular groove, a tail bearing is disposed in the annular groove, the second sleeve extends into and is fixedly connected with the inner ring of the tail bearing, and a sealing ring is disposed at the opening of the annular groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411730955.2A CN119223336B (en) | 2024-11-29 | 2024-11-29 | An encoder suitable for extreme temperature environments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411730955.2A CN119223336B (en) | 2024-11-29 | 2024-11-29 | An encoder suitable for extreme temperature environments |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN119223336A CN119223336A (en) | 2024-12-31 |
| CN119223336B true CN119223336B (en) | 2025-03-18 |
Family
ID=94070524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202411730955.2A Active CN119223336B (en) | 2024-11-29 | 2024-11-29 | An encoder suitable for extreme temperature environments |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN119223336B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103968877A (en) * | 2014-05-16 | 2014-08-06 | 中国科学院长春光学精密机械与物理研究所 | Vacuum experiment device for satellite-borne photo-electric axial angle encoder |
| CN113383209A (en) * | 2018-12-06 | 2021-09-10 | 谐波传动系统有限公司 | Double absolute type encoder |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0763184A1 (en) * | 1994-06-01 | 1997-03-19 | Stridsberg Innovation Ab | Position transducer |
| CN208606771U (en) * | 2018-08-10 | 2019-03-15 | 长春顺为科技有限公司 | A kind of photoelectric encoder and a kind of encoder |
| CN212058813U (en) * | 2020-03-24 | 2020-12-01 | 靖江特殊钢有限公司 | High temperature environment encoder air cooling device |
-
2024
- 2024-11-29 CN CN202411730955.2A patent/CN119223336B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103968877A (en) * | 2014-05-16 | 2014-08-06 | 中国科学院长春光学精密机械与物理研究所 | Vacuum experiment device for satellite-borne photo-electric axial angle encoder |
| CN113383209A (en) * | 2018-12-06 | 2021-09-10 | 谐波传动系统有限公司 | Double absolute type encoder |
Also Published As
| Publication number | Publication date |
|---|---|
| CN119223336A (en) | 2024-12-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211565962U (en) | Robot joint structure and robot | |
| US20190049149A1 (en) | Next Generation Bare Wire Water Heater | |
| CN119223336B (en) | An encoder suitable for extreme temperature environments | |
| US3217539A (en) | Turbine flow meter | |
| CN111239435A (en) | Wind speed and wind direction integrated detection sensor | |
| CN219760838U (en) | Novel magnetic coupler structure | |
| CN212311149U (en) | Laser output head, laser and laser processing equipment | |
| CN115096340B (en) | Easy-to-maintain sensor for optical detection and use method thereof | |
| CN104864914A (en) | Method and system for online detection of air pressure and temperature of air cylinder based on optical fiber sensing | |
| CN110190508B (en) | Miniaturized narrow linewidth semiconductor laser | |
| CN113075421A (en) | Hot-wire type wind speed sensor, preparation method and wind speed detection system | |
| CN116252984B (en) | Light spherical photoelectric pod | |
| CN202092949U (en) | Miniature high-resolution infrared gas sensor | |
| CN216122114U (en) | Hollow shaft motor structure for communication | |
| CN115638880A (en) | Radiation temperature probe structure | |
| JPS5855802A (en) | Device for detecting rotary displacement and linearly moving displacement | |
| CN209329897U (en) | steering gear | |
| CN114992194B (en) | An online synchronous detection device for oil cleanliness and viscosity and its working method | |
| CN221707287U (en) | A laser gas sensor with high anti-interference performance | |
| CN2669210Y (en) | A Novel Tunable Fabry-Perot Cavity Filter | |
| CN112032495A (en) | A simple cloud platform | |
| CN216595180U (en) | Multi-angle laser high-altitude wind measuring device | |
| CN209945988U (en) | High-temperature-resistant non-contact laser gas sensing measurement air chamber | |
| CN218243272U (en) | High-precision brushless motor encoder | |
| CN111649797A (en) | A fast identification camera remote water meter reading system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |