CN215497517U

CN215497517U - Non-glass device for laser gyro connection exhaust platform

Info

Publication number: CN215497517U
Application number: CN202120192053.3U
Authority: CN
Inventors: 宋建文; 黄云; 黄宗升; 许光明; 饶谷音; 战德军; 孙志刚
Original assignee: Jiangxi Chiyu Photoelectric Technology Development Co ltd
Current assignee: Jiangxi Chiyu Photoelectric Technology Development Co ltd
Priority date: 2021-01-23
Filing date: 2021-01-23
Publication date: 2022-01-11
Anticipated expiration: 2031-01-23

Abstract

The utility model provides a non-glass device that is used for laser top to connect exhaust platform which characterized in that: the first corrugated pipe is in butt joint with the vacuum exhaust platform, the other end of the first corrugated pipe is connected to the three-way joint, the other end of the three-way joint is connected with the second corrugated pipe, a clamping sleeve joint of the second corrugated pipe is connected with the laser gyro, the laser gyro is electrically connected with the high-voltage power supply, a third port of the three-way joint is connected with the storage tank through a sealing joint, the storage tank is made of non-glass materials and is a hollow flat-bottom round cylinder with an opening at the upper end, and a getter is arranged on the flat bottom of an inner cavity of the storage tank. Utilize bellows, sealing joint, cutting ferrule to connect respectively to realize flexonics and sealed butt joint, make between laser gyro and the vacuum exhaust platform each part be connected, dismantle efficiency and compare the glass sintering and show the improvement, avoid the potential safety hazard of glass structure simultaneously, realize the fireless operation of laser gyro, safe convenient, the gas tightness is good, effectively reduces the thermal deformation with diverging device in addition and disturbs, improves the measurement accuracy of laser gyro, has higher practical value.

Description

Non-glass device for laser gyro connection exhaust platform

Technical Field

The utility model belongs to the technical field of inertial navigation equipment manufacturing, and particularly relates to a non-glass device for a laser gyro connected with an exhaust platform.

Background

The laser gyro is a sensor for measuring the angular rate of a moving object, is one of the commonly used sensor types in the modern inertial navigation technology, and is generally in the form of a circular helium-neon laser resonant cavity, wherein the commonly used laser resonant cavity has a quadrangle, a triangle and the like. As with a conventional He-Ne laser, a laser gyro is filled with a helium-neon (He-Ne) gas at a certain pressure, which is called a working substance, and the purity of the working substance is guaranteed to be the core of maintaining the service life of the laser gyro. Due to the large air pressure difference (about 0.9 atm) between the inside and the outside of the cavity of the laser gyro, it is a difficult challenge to the laser gyro manufacturing process to prevent the atmospheric leakage during the use and storage period of about 10 years. In addition, other non-working gas molecules attached to the inner surface of the microcrystalline glass cavity and the inner surface of the electrode can be slowly released to influence the purity of the working gas, and as a result, the gain of the laser gyroscope is reduced, the laser intensity is weakened, and even the laser intensity cannot reach the condition of laser generation, so that the laser gyroscope fails. Therefore, the increase of impurity gas is one of the key factors affecting the lifetime of the laser gyro. In order to overcome the influence of impurity gas on the service life of the laser gyro, the laser gyro needs to be provided with a getter, the getter generally comprises zirconium, aluminum and the like, and after high-temperature activation, the getter can adsorb impurity gas molecules at normal temperature without adsorbing helium neon gas. However, the getter is generally activated after the laser gyro is aged, so that an auxiliary getter is needed to absorb the impurity gas generated in the aging process during the aging process of the laser gyro connected with a vacuum exhaust platform.

The cavity of the laser gyroscope is generally processed by low-expansion microcrystalline glass, and elements such as electrodes, reflecting lenses and the like are arranged outside the cavity of the laser gyroscope. After the resonant cavity is tuned, the resonant cavity must be connected with a vacuum exhaust table, and after aging treatment for several days, the reflecting lens is stable in adapting to a low-pressure environment, and simultaneously, the microcrystalline glass cavity and other elements sealed on the microcrystalline glass cavity are subjected to plasma cleaning, so that non-working gas molecules attached to the surface are further released. The pumping anode of the laser gyroscope is sealed and connected on the cavity through indium wire heating, pressurizing and softening, the sealing and connection has weak tolerance to shearing acting force, and if the whole connecting device is of a rigid structure, tangential stress damage can be caused to the indium seal of the pumping anode; for a long time, the connection between the laser gyroscope and the vacuum exhaust platform is realized through the transition between the photoelectric hard glass tube and the kovar alloy, the connection process needs to be sintered by using high-temperature flame generated by combustion of oxyhydrogen mixed gas, an operator needs to blow air into the heated and softened glass tube through a glass port by using a nozzle during sintering, and the pipe diameter of the connection part is controlled by using the air pressure of the air blowing. The disadvantages of this connection process are mainly: the oral cavity is easy to pollute a vacuum system by blowing, and in addition, the use of hydrogen brings great difficulty to the safety production management of a working site and also enables an operator to bear great psychological pressure.

In recent years, the connection between the laser gyro and the vacuum exhaust platform is greatly improved at home and abroad, and the metal cold connection platform of the laser gyro and the vacuum exhaust platform is realized by means of a clamping sleeve or a VCR interface. These improvements greatly reduce the use of hydrogen gas, but do not completely eliminate the use of hydrogen gas because the glass material still exists in these docking devices. For example, the auxiliary getters used during aging are still enclosed in a glass bulb and then transition-bonded to the metal line through kovar. Once the auxiliary getter is used, a oxyhydrogen flame sintering process is used to replace the new auxiliary getter. In addition, due to the existence of glass in the system, the glass can not be prevented from being broken in the long-time aging process, so that the atmosphere leaks into the vacuum system, pollutes the laser gyro and damages a precise vacuum device in the exhaust platform. Such a glass and metal coexisting mount device does not completely solve the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

In view of the above problems in the prior art, the present invention provides a non-glass device for a laser gyro connection exhaust table, which aims to: the oxyhydrogen flame sintering process is completely abandoned in the connection process of the laser gyro and the vacuum exhaust platform, and complete metal cold connection is realized, so that the tolerance and the service life of the laser gyro system in aging and operation states are improved.

The technical scheme of the utility model is as follows: a non-glass device for connecting a laser gyroscope with an exhaust platform comprises a connecting device assembly, the laser gyroscope, a high-voltage power supply, a vacuum exhaust platform and an activation coil. The connecting device assembly comprises a first corrugated pipe, a second corrugated pipe, a partition assembly, a three-way joint, a butt joint pipe, a sealing joint, a storage tank and a getter; a flange interface of the first corrugated pipe is in butt joint with a flange of the vacuum exhaust table, so that flexible connection between the connecting device assembly and the vacuum exhaust table is formed; the other end of the first corrugated pipe is connected to the three-way joint through the partition assembly containing insulating non-glass materials, the other port of the three-way joint is connected with the second corrugated pipe, and the other end of the second corrugated pipe is connected with the air-extracting anode of the laser gyroscope through a clamping sleeve joint, so that flexible connection of the connecting device assembly and the laser gyroscope is formed; the cathode and the anode of the laser gyroscope are respectively electrically connected with the cathode and the anode of the high-voltage power supply; in addition, a third port of the three-way joint is in sealing connection with the sealing joint through the butt joint pipe, the storage tank is connected below the sealing joint, the storage tank is made of non-glass materials and is a hollow flat-bottom round cylinder with an open upper end, and the getter placed on the flat bottom of the storage tank is arranged in the inner cavity of the storage tank; the activation coil is arranged below the flat bottom of the storage tank, and the coil is perpendicular to the flat bottom of the storage tank around the axis and is superposed with the axis of the storage tank.

Furthermore, the connecting device assembly further comprises a shunt ring, the shunt ring is an annular body made of weak magnetic alloy or nonmagnetic alloy material, the inner diameter of the annular body is in interference fit or transition fit with the outer diameter of the storage tank, when the activation coil is used for activating the getter, the shunt ring is sleeved on the outer wall of the bottom of the storage tank, and when the getter is in an activated state, the shunt ring can be detached for independent heat dissipation.

Furthermore, a vacuum gauge is arranged on a pipeline between a vacuum pump system for generating negative pressure in the vacuum exhaust platform and the flange interface, and the measurement accuracy order of the vacuum gauge is less than 1 multiplied by 10^-6And the judgment standard of the activation state of the getter is that the vacuum gauge reading is increased by at least 2 orders of magnitude.

Furthermore, the cutting ferrule connects including cutting ferrule nut, preceding cutting ferrule, back cutting ferrule, the main joint body, wherein the cutting ferrule nut box in on the positive pole of bleeding of laser gyroscope, preceding cutting ferrule, back cutting ferrule are the conical body to cup joint respectively from outside to interior on the positive pole of bleeding, wherein preceding cutting ferrule external diameter is greater than back cutting ferrule, makes when the external screw thread of the main joint body and the internal thread butt joint installation of cutting ferrule nut, the two compresses tightly preceding cutting ferrule, back cutting ferrule jointly and forms sealed space, and the other end seal of the main joint body is fixed in the end of bellows two.

Further, the sealing joint comprises a VCR joint, a VCR nut and a sealing washer, wherein the VCR joint is fixed to the butt joint pipe end, the VCR nut is sleeved at the VCR joint, and the VCR joint and the end of the storage tank are abutted against both ends of the sealing washer together by screwing the VCR nut into the external thread of the end of the storage tank, so as to form the sealing connection between the three-way joint and the storage tank.

Furthermore, the partition component comprises a ceramic pipe in the middle and metal pipes at two ends, the two metal pipes are fixed at two ends of the ceramic pipe through brazing, the metal pipe at one end is welded and fixed with a connecting pipe, and the other end of the connecting pipe is connected with the three-way joint.

Further, the getter is a zirconium-aluminum getter, and when the getter is activated, the activation coil is driven by 950-1100W of power to generate electromagnetic waves with the frequency of 1.5 +/-0.1 MHz; the activation coil is opened at intervals, the opening time is less than or equal to 25s each time, and the total duration time for keeping the activation temperature of the getter is 5-15 min by opening the activation coil for multiple times, so that the getter enters a fully activated state and performs a gas absorption function.

Furthermore, the number of the surrounding turns of the activating coil is 2-4, and when the activating coil works, the distance between the horizontal plane where the activating coil is located and the bottom surface of the getter is smaller than or equal to 50 mm.

Further, the getter is in a shape of a round cake, the difference between the inner diameter of the storage tank and the outer diameter of the getter is 0-3 mm, and the storage tank is made of 304 austenite nonmagnetic stainless steel or nonmagnetic alloy material.

Furthermore, the outer wall of the shunt ring is provided with convex shunt edges distributed in a snake-shaped routing path, and the snake-shaped routing path of the shunt edges is arranged around the axis of the shunt ring in a circle.

The utility model has the beneficial effects that:

1. the design of the non-glass material storage tank, the partition component and the corrugated pipe connecting structure is utilized, the use of glass materials is completely abandoned, the metal cold connection between the laser gyro and the vacuum exhaust platform is realized, the disassembly and the assembly are convenient, the sealing performance is good, the potential safety hazard caused by the use of hydrogen is thoroughly eliminated, and the pollution and the damage of the glass pipe breakage to a vacuum system and the laser gyro do not need to be worried; meanwhile, the getter in the storage tank can continuously generate a gas suction effect after various vacuum pumps in a vacuum exhaust system stop working, impurity gas generated in the aging process of the laser gyro is adsorbed, the flat-bottom structure of the storage tank is utilized to enable the activation coil to be calibrated from the outside, the electromagnetic activation efficiency and the working gas purity are effectively improved, fireless operation is realized by mounting and replacing the getter, safety and convenience are realized, the air tightness is good, and the running precision, the service life and the stability of the laser gyro device are greatly guaranteed.

2. The flexible connection of the corrugated pipe can effectively avoid the stress damage of rigid connection to the laser gyro and the air-extracting anode indium seal structure thereof, and meanwhile, the flexible assembly and disassembly and the tight sealing of the air suction device assembly are realized by the VCR connector and the ferrule connector, and the connection and disassembly efficiency of the connecting device assembly, the laser gyro and the vacuum exhaust platform is obviously improved compared with that of glass sintering, thereby having better practical value in the industry.

3. According to the utility model, through the design that the shunt ring is sleeved on the outer wall of the bottom of the storage tank, by utilizing the skin effect of high-frequency alternating current, a large amount of induced eddy currents of the activation coil are respectively concentrated on the outer wall of the shunt ring and the thin surface of the bottom of the storage tank outside the activation getter, so that the influence of the eddy current heat effect on the side wall of the storage tank is effectively shared, the thermal deformation degree of the storage tank is reduced, the interference of heat conducted through the metal connecting piece to the laser gyro is prevented, and the measurement precision of the laser gyro is effectively improved; meanwhile, the parallel coupling of the outer wall eddy current is formed by the shunting edges arranged by the snake-shaped routing on the outer wall of the shunting ring, so that the concentration degree of the induced eddy current on the outer wall of the shunting ring is effectively inhibited, the self thermal deformation degree of the shunting ring is further reduced, the alignment precision and the activation efficiency of the activation coil on the getter are ensured, and the interference resistance of the whole device on the thermal deformation is improved.

Drawings

FIG. 1 is a schematic view of an assembly structure of the present invention;

FIG. 2 is a schematic view of the connecting device assembly of the present invention;

FIG. 3 is an exploded view of a portion of the partition assembly of the present invention;

figure 4 is an exploded view of the relevant structure of the ferrule-based fitting of the present invention;

FIG. 5 is an exploded view of the structure associated with the sealing joint of the present invention;

FIG. 6 is a schematic diagram of the operating state of the activation coil of the present invention;

FIG. 7 is a schematic view of the installation structure of the shunt ring and the storage tank according to the present invention;

FIG. 8 is a schematic view of the direction of the vortex flow of the diverging edges of the present invention;

FIG. 9 is a schematic diagram of finite element analysis of a storage tank under the effect of eddy current heat in accordance with the present invention;

FIG. 10 is a schematic diagram of a finite element analysis of the storage tank of the present invention after installation of the diverter ring under the thermal effect of eddy currents.

In the figure: 1-connecting device assembly, 11-bellows I, 111-flange interface, 12-bellows II, 121-ferrule connector, 121 a-ferrule nut, 121 b-front ferrule, 121 c-rear ferrule, 121 d-main connector body, 13-partition component, 131-ceramic tube, 132-metal tube, 133-connecting tube, 14-three-way connector, 15-butt-joint tube, 16-sealing connector, 161-VCR connector, 162-VCR nut, 163-sealing gasket, 17-storage tank, 18-getter, 19-shunt ring, 19a shunt edge, 2-laser gyroscope, 21-pumping anode, 22-cathode, 23-anode, 3-high voltage power supply, 4-vacuum exhaust platform, 41-vacuum pump system, 42-vacuum gauge, 5-activation coil.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples.

Example one

As shown in figures 1-6, a non-glass device for connecting a laser gyro 2 with an exhaust platform comprises a connecting device assembly 1, the laser gyro 2, a high-voltage power supply 3, a vacuum exhaust platform 4 and an activation coil 5. The connecting device assembly 1 comprises a first corrugated pipe 11, a second corrugated pipe 12, a partition component 13, a three-way joint 14, a butt joint pipe 15, a sealing joint 16, a storage tank 17 and a getter 18; the flange interface 111 of the bellows I11 is in butt joint with the flange of the vacuum exhaust platform 4, so that flexible connection between the connecting device assembly 1 and the vacuum exhaust platform 4 is formed, a vacuum gauge 42 is arranged on a pipeline between a vacuum pump system 41 for generating negative pressure in the vacuum exhaust platform 4 and the flange interface 111, and the measurement of the vacuum gauge 42 is realizedThe magnitude of the accuracy of the quantity is 1 × 10^-7(ii) a The other end of the first bellows 11 is connected to the three-way joint 14 through the partition assembly 13, the partition assembly 13 includes a ceramic tube 131 in the middle and a metal tube 132 fixed at two ends thereof by brazing, wherein the metal tube 132 at one end is welded and fixed with a connecting tube 133, and the other end of the connecting tube 133 is connected with the three-way joint 14; the other end of the three-way joint 14 is connected with the second corrugated pipe 12, the ferrule joint 121 at the other end of the second corrugated pipe 12 is connected with the air extraction anode 21 of the laser gyroscope 2, thereby forming the flexible connection between the connecting device assembly 1 and the laser gyroscope 2, wherein the ferrule joint 121 comprises a ferrule nut 121a, a front ferrule 121b, a rear ferrule 121c and a main joint body 121d, the ferrule nut 121a is sleeved on the pumping anode 21 of the laser gyroscope 2, the front cutting ferrule 121b and the rear cutting ferrule 121c are both conical bodies and are respectively sleeved on the air extraction anode 21 from outside to inside, wherein the outer diameter of the front ferrule 121b is larger than that of the rear ferrule 121c, so that when the external thread of the main fitting body 121d is butt-jointed with the internal thread of the ferrule nut 121a, the front ferrule 121b and the rear ferrule 121c are compressed by the two parts together to form a sealed space, and the other end of the main joint body 121d is hermetically fixed at the end of the second corrugated pipe 12; the cathode 22 and the anode 23 of the laser gyroscope 2 are respectively and electrically connected with the cathode and the anode of the high-voltage power supply 3; in addition, the third port of the three-way joint 14 forms a sealing connection with the sealing joint 16 through the butt joint pipe 15, the sealing joint 16 comprises a VCR joint 161, a VCR nut 162 and a sealing washer 163, wherein the VCR joint 161 is fixed at the butt joint pipe 15 end, the VCR nut 162 is sleeved at the VCR joint 161, and the VCR joint 161 and the storage tank 17 end are abutted against both ends of the sealing washer 163 by screwing the VCR nut 162 into the external end thread of the storage tank 17, so as to form a sealing connection between the three-way joint 14 and the storage tank 17; the storage tank 17 is made of 304 austenite nonmagnetic stainless steel and is a hollow flat-bottom round cylinder with an opening at the upper end, the getter 18 placed on the flat bottom is arranged in the inner cavity of the storage tank 17, the getter 18 is a round cake-shaped zirconium-aluminum getter 18, and the outer diameter of the getter is 2mm smaller than the inner diameter of the storage tank 17; the activation coil 5 is arranged below the flat bottom of the storage tank 17, and the coil surrounds the axis and the storage tank 17The flat bottom is vertical and coincides with the axis of the reservoir 17.

The working steps of this embodiment are as follows:

the method comprises the following steps: before the getter 18 is put into the storage tank 17, the threaded joint needs to be detached, then the flat bottom of the getter 18 is downwards slid into the bottom plane along the inner wall of the storage tank 17, the flat bottom and the bottom plane are jointed, then the components are connected and installed as described above, and the sealing tightness of the joint parts of the ferrule joint 121, the sealing joint 16 and the like is checked, so that the air tightness of the device is ensured.

Step two: starting the vacuum pump system 41 to pump air, maintaining the low-pressure state of the system operation, then starting the high-voltage power supply 3, discharging and starting the glow between the cathode 22 and the anode 23, wherein the glow starting voltage is up to thousands of volts, and maintaining the voltage to hundreds of volts after the current is stabilized. Since the extraction anode 21 is not only an electrode of the laser gyro 2 but also a connection port between the laser gyro 2 and the vacuum exhaust stage 4, insulation is ensured by the ceramic tube 131 of the partition member 13 in the connection device assembly 1. Insulation blocking is formed between the anode of the high-voltage power supply 3 and the 132 metal pipes of the vacuum exhaust table 4, so that the safety of equipment and operators is guaranteed; meanwhile, the flexible connection of the first corrugated pipe 11 and the second corrugated pipe 12 is utilized to effectively prevent the indium seal structure of the pumping anode 21 from being damaged by stress.

Step three: the axis of the activating coil 5 is aligned to the center of the circular bottom surface of the storage tank 17, the distance between the center of the section of the activating coil 5 and the bottom surface of the storage tank 17 is ensured to be 15mm, the difference between the inner diameter of the storage tank 17 and the design size of the round cake-shaped outer diameter of the getter 18 is only 2mm, the prior glass shell is not needed for visual calibration, and the axis of the activating coil 5 can be aligned to the axis of the storage tank 17 only; then, the activating coil 5 with 4 turns of winding is driven with 1000W power to generate electromagnetic wave with frequency of 1.5MHz, the coil power supply is suspended after the first start-up for 25s, then the activating coil 5 is started for a plurality of times at certain intervals, the activating coil 5 is started for each time to keep the getter 18 at a constant activating temperature, the operation mode lasts for 5-12 min at the intervals, if the magnitude of the indication of the vacuum gauge 42 is 10 in the process^-7Is raised to 10^-5Can ensure the getter 18 has entered the stimulated inspiration state and then the coil power supply is turned off. Because the activation adopts an electromagnetic induction heating mode, high-frequency alternating current is enabled to generate a high-frequency electromagnetic field through a coil, a magnetic induction line penetrates through the cake-shaped getter 18, eddy current is generated in the getter 18, and a heat effect is triggered, so that high temperature is achieved, the air suction substance is activated, and impurity gas in the inner cavity of the whole device is adsorbed. Meanwhile, because the storage tank 17 is made of metal, a certain degree of eddy current effect is generated to generate heat, as shown in fig. 7, the parameters are simulated by a multi-physical field interface in simulation software COMSOL Multiphysics finite element analysis, the temperature of the bottom surface of the storage tank 17 is 350 ℃ and the temperature of the side wall close to the bottom end is about 200 ℃ when the activation coil 5 lasts for 25s, and the thermal deformation degree of the storage tank 17 can be ensured to meet the requirement of the use range because the deformation temperature range of the stainless steel is 900-1150 ℃, so that the alignment degree of the activation coil 5 is further maintained; meanwhile, the parameters and the structure are tested by production practice in actual production, the air tightness is good, the leakage rate is extremely low, the high reliability is shown in high-temperature baking, and the measurement precision of the laser gyroscope 2 is guaranteed.

Step four: and (3) periodically activating the getter 18 according to the operation in the step three, and releasing a large number of gas molecules (the number of the vacuum gauge 42 is increased by two orders of magnitude) in the periodic heating degassing process, so that the purpose of absorbing the impurity gas is achieved in the aging process of the laser gyroscope 2, and the service life of the laser gyroscope 2 in long-term operation is prolonged.

Example two

The difference between the present embodiment and the first embodiment is: the connecting device assembly 1 further comprises a shunt ring 19, wherein the shunt ring 19 is made of a non-magnetic alloy material and is an annular body, and the inner diameter of the annular body is in interference fit with the outer diameter of the storage tank 17.

When the activation of the adsorbent 18 by the activation coil 5 is performed, the shunt ring 19 is fitted over the outer wall of the bottom of the reservoir 17 so that the bottom surface of the shunt ring 19 is flush with the bottom surface of the reservoir 17, as shown in fig. 7. At this time, the activation coil 5 is started according to the same parameters and method described in the third step of the first embodiment, and by using the skin effect of the high-frequency alternating current, a large amount of induced eddy currents of the activation coil 5 are respectively concentrated on the outer wall of the shunt ring 19 and the thin surface of the bottom of the storage tank 17 outside the activated getter 18, so that the influence of the eddy current thermal effect on the side wall of the storage tank 17 is effectively shared. As shown in fig. 10, the storage tank 17 with the shunt ring 19 is simulated by the multi-physics interface in the simulation software COMSOL Multiphysics finite element analysis, and the temperature of the bottom surface of the storage tank 17 is 350 ℃ and the temperature of the side wall close to the bottom end is about 50 ℃ when the coil 5 is activated for 25s, which is calculated to be obviously lower than the temperature (200 ℃) of the side wall of the bottom measured in the first embodiment, and the addition of the shunt ring 19 has obvious effect on the temperature reduction of the side wall of the storage tank 17.

Induction temperature/mounting structure	Single storage pot (fig. 9)	Storage tank + shunting ring (fig. 10)
			Temperature (. degree.C.) of bottom surface of storage tank	350	350
Storage tank bottom side wall temperature (. degree. C.)	200	50
			Temperature (. degree.C.) of the middle side wall of the storage tank	100	25

As is apparent from fig. 10, the sidewall of the storage tank 17 is hardly affected by the eddy current thermal effect, and the heat generated by the induction heating is mainly concentrated on the bottom surface of the storage tank 17 and the getter 18 disposed on the bottom surface, so as to effectively reduce the thermal deformation degree of the storage tank 17 in the axial direction, prevent the thermal interference to the laser gyro 2 caused by the heat conducted through the metal connecting member, and improve the measurement accuracy of the laser gyro 2 and the calibration accuracy of the activation coil 5.

As can be analyzed by comparing fig. 10 and fig. 9, although the temperature reduction effect of the shunt ring 19 on the sidewall of the storage tank 17 is large, the temperature caused by the bottom surface of the storage tank 17 does not change significantly, so it can be determined that the interference degree of the shunt ring 19 on the electromagnetic field at the central portion of the activation coil 5 is low, and therefore, the high-frequency electromagnetic field at the annular central portion of the activation coil 5 can pass through the getter 18 on the bottom surface of the storage tank 17 as usual, so as to perform the activation operation normally.

After the intermittent activation operation lasting for 5-12 min is completed, the indication of the vacuum gauge 42 changes obviously, which indicates that the getter 18 reaches an activated state, the power supply of the activation coil 5 is turned off, the storage tank 17 is kept still for a moment, residual high temperature on the bottom surface of the storage tank 17 is transferred upwards to the shunt ring 19, and then the shunt ring 19 is dismounted by a tool to reduce independent isolation and heat dissipation, so that most of induction heat energy is ensured to be absorbed by the shunt ring 19, the influence of thermal interference on the whole device is reduced, and the measurement accuracy of the laser gyro 2 is improved.

EXAMPLE III

The difference between this embodiment and the first embodiment is: the connector assembly 1 further includes a shunt ring 19, and the present embodiment is different from the second embodiment in that: the outer wall of the shunt ring 19 is provided with convex shunt ridges 19a distributed in a serpentine routing path, and the serpentine routing path of the shunt ridges 19a is arranged around the axis of the shunt ring 19.

As shown in fig. 7, the shunt ring 19 with the shunt ribs 19a is fitted over the outer wall of the bottom of the storage tank 17 so that the bottom surface of the shunt ring 19 is flush with the bottom surface of the storage tank 17, and then the activation coil 5 is activated according to the same parameters and method as described in the second embodiment.

As shown in fig. 8, when the excitation coil generates a high-frequency electromagnetic field to act on the shunt ring 19 to generate a high-frequency induced eddy current, the induced eddy current is concentrated on the thin sheet of the conductor surface due to the skin effect of the high-frequency current, so that the induced eddy current propagates along the serpentine routing path of the shunt edge 19a, and the current directions on any two adjacent edges of the shunt edge 19a are opposite to each other, so as to divide a plurality of magnetic field regions with opposite adjacent directions (as shown in fig. 8, the magnetic field direction of the symbol "×" points to the axis of the shunt edge 19a, and the magnetic field direction of the symbol "·" points away from the axis of the shunt edge 19 a), therefore, when the eddy current varies with the variation of the alternating electromagnetic field, the edge current of each magnetic field region in fig. 8 is suppressed by the induced current generated by the adjacent opposite magnetic fields, and similarly, by the parallel coupling among a plurality of edges, the shunt edge 19a can be equivalent to a circular filter inductor as a whole, therefore, the current intensity of the high-frequency eddy current on the surface of the diverter ring 19 is reduced, meanwhile, the diverter edge 19a can play a role in auxiliary heat dissipation, and through the mode, the self thermal deformation degree of the diverter ring 19 is further reduced, so that the alignment accuracy and the activation efficiency of the activation coil 5 on the getter 18 are ensured, and the anti-interference capability of the whole device on the thermal deformation is improved.

The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form, and it should be understood that other modifications, changes and equivalents may occur to those skilled in the art, which uses the features of the present invention claimed herein, and they should fall within the scope of the present invention.

Claims

1. The utility model provides a non-glass device for laser gyro connects exhaust platform, includes connecting device assembly, laser gyro, high voltage power supply, vacuum exhaust platform, activation coil, its characterized in that: the connecting device assembly comprises a first corrugated pipe, a second corrugated pipe, a partition assembly, a three-way joint, a butt joint pipe, a sealing joint, a storage tank and a getter, wherein a flange interface of the first corrugated pipe is in butt joint with a flange of the vacuum exhaust table so as to form flexible connection of the connecting device assembly and the vacuum exhaust table, the other end of the first corrugated pipe is connected to the three-way joint through the partition assembly containing insulating non-glass materials, the other port of the three-way joint is connected with the second corrugated pipe, the other end of the second corrugated pipe is connected with an air suction anode of the laser gyro so as to form flexible connection of the connecting device assembly and the laser gyro, a cathode and an anode of the laser gyro are respectively and electrically connected with a cathode and an anode of the high-voltage power supply, and in addition, a third port of the three-way joint is in sealing connection with the sealing joint through the butt joint pipe, the storage tank is connected below the sealing joint, the storage tank is made of non-glass materials and is a hollow flat-bottom round cylinder with an opening at the upper end, the getter is arranged in the inner cavity of the storage tank and placed on the flat bottom of the storage tank, the activation coil is arranged below the flat bottom of the storage tank, and the coil surrounds the axis and is vertical to the flat bottom of the storage tank and is superposed with the axis of the storage tank.

2. A non-glass apparatus for a laser gyro interface exhaust station as claimed in claim 1 wherein: the connecting device assembly further comprises a shunt ring, the shunt ring is an annular body made of weak magnetic alloy or nonmagnetic alloy materials, the inner diameter of the annular body is in interference fit or transition fit with the outer diameter of the storage tank, when the activation coil is used for activating the getter, the shunt ring is sleeved on the outer wall of the bottom of the storage tank, and when the getter is in an activated state, the shunt ring can be detached for independent heat dissipation.

3. A non-glass apparatus for a laser gyro interface exhaust station as claimed in claim 1 wherein: a vacuum gauge is arranged on a pipeline between a vacuum pump system for generating negative pressure in the vacuum exhaust table and the flange interface, and the measurement precision order of the vacuum gauge is less than 1 multiplied by 10^-6And the judgment standard of the activation state of the getter is that the vacuum gauge reading is increased by at least 2 orders of magnitude.

4. A non-glass apparatus for a laser gyro interface exhaust station as claimed in claim 1 wherein: the clamping sleeve joint comprises a clamping sleeve nut, a front clamping sleeve, a rear clamping sleeve and a main joint body, wherein the clamping sleeve nut is sleeved on the air exhaust anode of the laser gyroscope, the front clamping sleeve and the rear clamping sleeve are conical bodies and are sleeved on the air exhaust anode from outside to inside respectively, the outer diameter of the front clamping sleeve is larger than that of the rear clamping sleeve, when the external thread of the main joint body is in butt joint with the internal thread of the clamping sleeve nut, the front clamping sleeve and the rear clamping sleeve are compressed together by the front clamping sleeve and the rear clamping sleeve to form a sealing space, and the other end of the main joint body is fixed at the end of the corrugated pipe II in a sealing mode.

5. A non-glass apparatus for a laser gyro interface exhaust station as claimed in claim 1 wherein: the sealing joint comprises a VCR joint, a VCR nut and a sealing gasket, wherein the VCR joint is fixed at the end head of the butt joint pipe, the VCR nut is sleeved at the VCR joint, and the VCR joint and the end head of the storage tank are propped against the two ends of the sealing gasket together by screwing the VCR nut into the external thread position of the end head of the storage tank to form the sealing connection between the three-way joint and the storage tank.

6. A non-glass apparatus for a laser gyro interface exhaust station as claimed in claim 1 wherein: the partition component comprises a ceramic pipe in the middle and metal pipes at two ends, the two metal pipes are fixed at the two ends of the ceramic pipe through brazing, the metal pipe at one end is welded and fixed with a connecting pipe, and the other end of the connecting pipe is connected with the three-way joint.

7. A non-glass apparatus for a laser gyro interface exhaust station as claimed in claim 1 wherein: the getter is a zirconium-aluminum getter.

8. A non-glass apparatus for a laser gyro interface exhaust station as claimed in claim 1 wherein: the number of the surrounding turns of the activating coil is 2-4, and when the activating coil works, the distance between the horizontal plane where the activating coil is located and the bottom surface of the getter is not more than 50 mm.

9. A non-glass apparatus for a laser gyro interface exhaust station as claimed in claim 1 wherein: the getter is in a round cake shape, the difference value between the inner diameter of the storage tank and the outer diameter of the getter is 0-3 mm, and the storage tank is made of 304 austenite nonmagnetic stainless steel or nonmagnetic alloy materials.

10. A non-glass apparatus for a laser gyro interface exhaust station as claimed in claim 2 wherein: the outer wall of the shunting ring is provided with convex shunting ridges distributed in a snake-shaped routing path, and the snake-shaped routing path of the shunting ridges surrounds the axis of the shunting ring for one circle to be arranged.