Liquid-floated gyroscope liquid injection control device and method for injecting liquid using the same

Abstract

The application provides a liquid-floated gyroscope liquid injection control device and a method for injecting liquid by using the device, and solves the technical problem that the liquid-floated quantity control mode of the existing liquid-floated gyroscope is relatively extensive, the liquid injection quantity is not suitable, and the overall performance of the gyroscope is unstable. The application is characterized in that a filling nozzle is arranged on the upper end cover of the shell of the liquid-floated gyroscope, the liquid injection and discharge are facilitated, a screw rod is arranged at the bottom of the liquid-floated gyroscope, and a nut and a baffle matched with the screw rod are added. Thus, the screw rod, the nut and the baffle jointly form an internal cavity volume adjusting mechanism of the gyroscope, the storage space in the gyroscope is adjusted, the excess liquid in the gyroscope can be discharged at high temperature, and the purpose of precisely controlling the liquid input quantity in the gyroscope is achieved.

Description

Technical Field

[0001] This invention belongs to the field of electromechanical inertial sensor technology, specifically relating to a liquid-floating gyroscope liquid injection control device and a method for injecting liquid using the device. Background Technology

[0002] Liquid-floated gyroscopes are core sensors in inertial navigation and control systems. They utilize the buoyancy generated by the floating liquid to reduce the weight of the float assembly on the supporting bearing, ultimately improving the gyroscope's accuracy. The gyroscope includes a housing, float, torque converter, signal transducer, float support bearing, and bellows. High-temperature oil leakage or insufficient volume of the floating liquid at low temperatures is one of the main failure modes of liquid-floated gyroscopes, which has long plagued gyroscope production. Precise control of the floating liquid volume remains a significant research challenge.

[0003] When a gyroscope is working, the ambient temperature varies within a certain range (e.g., -40℃ to 60℃). As the ambient temperature changes, the internal volume of the gyroscope expands and contracts. Normally, this change is compensated for by the bellows inside the gyroscope. However, during production, oil is typically filled at room temperature, and the bellows is generally in a freely open state. At this time, the internal cavity volume of the gyroscope reaches its maximum or minimum. Before the oil filling is completed, the volume of the internal fluid is controlled by pressurizing and observing the compression of the bellows. This method of controlling the fluid volume is rather crude, often resulting in situations where there is too much fluid, causing the bellows to rupture and leak at high temperatures or at welded joints of components; or, conversely, there is too little fluid, resulting in insufficient compensation from the bellows at low temperatures. All of these situations will lead to the gyroscope failing to meet performance standards.

[0004] To address the aforementioned issues, it is necessary to explore a liquid-floating gyroscope liquid injection control device and a method for injecting liquid using this device to ensure the accuracy of the liquid injection volume. Summary of the Invention

[0005] The purpose of this invention is to solve the technical problem that the existing liquid floatation control method of liquid floatation gyroscope is relatively crude and the amount of floatation injected is inappropriate, which leads to the overall unstable performance of the gyroscope. The invention provides a device and method for controlling the amount of input floatation liquid in a liquid floatation gyroscope.

[0006] To achieve the above objectives, the technical solution provided by this invention is:

[0007] A liquid-floating gyroscope liquid injection control device is characterized in that it is assembled on the housing of the liquid-floating gyroscope and includes an oil filling nozzle and an internal space adjustment mechanism of the gyroscope.

[0008] The oil filling nozzle is located at the original oil inlet on the upper end cover of the floating liquid gyroscope housing and is connected to the internal space of the gyroscope, that is, the floating liquid is injected through the oil filling nozzle when it is injected.

[0009] The internal space adjustment mechanism of the gyroscope includes a screw, a nut, and a baffle.

[0010] The baffle is installed at the lower end of the housing of the floating liquid gyroscope;

[0011] The screw passes vertically through the baffle and the lower end plate of the bellows inside the liquid-floating gyroscope and is connected to the bottom surface of the upper end plate of the bellows; the nut is located outside the baffle and cooperates with the screw to adjust the degree of expansion and contraction of the bellows. It is mainly used to assist in the injection of the floating liquid through the internal space adjustment mechanism of the gyroscope when the floating liquid is injected.

[0012] Meanwhile, the present invention also provides a method for injecting floating liquid using the above-mentioned liquid-floating gyroscope liquid injection control device, which is characterized by including the following steps:

[0013] 1) Assemble the above-mentioned liquid-floating gyroscope liquid injection control device onto the liquid-floating gyroscope;

[0014] 2) At room temperature, the bellows of the liquid-floating gyroscope is tightened by the cooperation of the nut and screw, so that the compression of the bellows is greater than or equal to the compression length L of the bellows. 压 The compression length is the amount of compression of the bellows by the floating liquid relative to the free state of the bellows when the liquid-floated gyroscope is used in the highest temperature environment.

[0015] 3) With the filling nozzle facing upwards, fill the internal cavity of the liquid-floated gyroscope with floating liquid until it is full at room temperature;

[0016] 4) Keep the oil filling nozzle facing upward and the bellows taut. Place the liquid-floated gyroscope in the highest temperature environment for its application and keep it warm until the temperature of the floating liquid is the same as that of the external environment, so that the internal temperature of the liquid-floated gyroscope can be stabilized.

[0017] 5) Under the highest temperature environment, cut off the oil filling nozzle and clamp and weld it shut; at this time, the volume of the internal floating liquid of the product is V. 高 That is, the volume V of the floating liquid can be injected. 液 Volume at high temperature;

[0018] 6) Unscrew the nut, remove the baffle, and cut off any excess screw. The floatation injection is now complete.

[0019] Furthermore, in step 2), the compression length L of the bellows... 压 Determined by the following method:

[0020] S1. Determine the volume V of the liquid that can be injected into the liquid-floating gyroscope. 液 ;

[0021] V 液 The calculation formula is as follows:

[0022]

[0023] Where: V0—total volume of the cavity of the liquid-floating gyroscope housing;

[0024] Vi—refers to the volume of other necessary components inside the liquid-float gyroscope (such as: signaler, torquer, float, bellows), i = 1, 2, 3....n; where the volume of the bellows is the volume in the free state, which can be estimated based on the diameter and height of the bellows installation space, and can be repaired later according to the selection, as long as it is within the allowable error of 10%.

[0025] S2. Determine the bellows compensation amount V 补偿 ;

[0026] The bellows compensation amount V 补偿 It equals the change in volume of the floating liquid, ΔV;

[0027] The formula for calculating the change in volume of the flotation liquid, ΔV, is as follows:

[0028] △V=V 高 -V 低

[0029] In the formula:

[0030] V 高 —Floating liquid V 液 Volume at high temperature;

[0031] V 低 —Floating liquid V 液 Volume at low temperatures;

[0032] The high and low temperatures are determined by the requirements of the application environment of the liquid-float gyroscope, and the calculation method is as follows:

[0033] V 高 =V 液 ·(1+k·(T 高 -T 常温 ))

[0034] V 低 =V 液 ·(1-k·(T 常温 -T 低 ))

[0035] In the formula:

[0036] k—coefficient of thermal expansion of the liquid volume, in cm⁻¹ 3 / ℃, refer to relevant flotation data for details;

[0037] T 高 —Highest operating temperature for liquid-float gyroscopes, ℃;

[0038] T 低 —Minimum operating temperature for liquid-float gyroscopes, °C;

[0039] S3. Calculate the compression length L 压

[0040] Based on the bellows compensation amount V obtained in step S2 补偿 Based on the installation space of the bellows in the liquid-floating gyroscope, and according to the bellows product manual, a suitable bellows model is initially determined. Those skilled in the art know how to select the model and length in the free state according to the product manual provided by the bellows product manufacturer based on the compensation amount and installation space, and determine the bellows extension length L (i.e., the difference between the longest length of the bellows in the stretched state and the shortest length in the compressed state, which can be determined according to the bellows product manual, the bellows model, and the length in the free state).

[0041] Bellows compression length L 压 The calculation formula is:

[0042] L 压 =L·(T 高 -T 常温 ) / (T 高 -T 低 )

[0043] in:

[0044] T 高 —Highest operating temperature for liquid-float gyroscopes, ℃;

[0045] T 低 —Minimum operating temperature for liquid-float gyroscopes, °C;

[0046] T 常温 —The typical operating temperature for liquid-floated gyroscopes is ℃.

[0047] Furthermore, this method allows for precise control of the injection volume of the liquid-floated gyroscope. For a given model of liquid-floated gyroscope, after one injection using this method, the mass of the liquid can be calculated based on the final volume of injected liquid. This mass can then be used to control the injection of liquid for the same model of liquid-floated gyroscope. The mass can be calculated using m = ρV, where ρ is the specific gravity of the liquid (g / cm³). 3 .

[0048] The advantages of this invention are:

[0049] 1. This invention provides an oil filling nozzle on the upper end cover of the liquid-floated gyroscope housing to facilitate the injection and discharge of the floating liquid. A screw is provided at the bottom of the liquid-floated gyroscope, along with a matching nut and baffle. Thus, the screw, nut, and baffle together form an internal cavity volume adjustment mechanism (i.e., an internal space adjustment mechanism for the gyroscope), achieving the purpose of adjusting the internal storage space of the gyroscope. It can also be used to overflow excess floating liquid inside the gyroscope at high temperatures, achieving the purpose of precisely controlling the amount of floating liquid input inside the gyroscope.

[0050] 2. By using the control device and injection method of the present invention to inject the floating liquid, the injection volume of the floating liquid inside the liquid-floating gyroscope can be precisely controlled, thereby determining the injection volume of the floating liquid in a certain model of liquid-floating gyroscope.

[0051] 3. The method of this invention ensures that, under high-temperature conditions, the internal cavity volume of the liquid-floated gyroscope is maximized when the liquid-floated liquid is fully filled, and the liquid volume also reaches its maximum value. Conversely, under low-temperature conditions, the internal cavity volume is minimized when the bellows expands, allowing the liquid to fully fill the cavity, preventing any internal cavities. This ensures that under high-temperature conditions, the expansion of the liquid will not cause cracking or leakage at the welded joints of components, and under low-temperature conditions, there will be no internal cavities that would affect product performance. Attached Figure Description

[0052] Figure 1 A schematic diagram illustrating the precise control of the internal float volume of a gyroscope.

[0053] Figure 2 A schematic diagram of the bellows after the internal space adjustment mechanism of the gyroscope is assembled.

[0054] The attached icons are numbered as follows:

[0055] 1-House, 2-Float, 3-Bottom plate, 4-Baffle, 5-Nut, 6-Screw, 7-Torquer, 8-Cavity, 9-Signal device, 10-End cap, 11-Oil filling nozzle, 12-Bellwall, 13-End plate. Detailed Implementation

[0056] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0057] like Figure 1-2As shown, a liquid-floating gyroscope liquid injection control device is assembled on the liquid-floating gyroscope housing, including an oil filling nozzle and an internal space adjustment mechanism for the gyroscope. The oil filling nozzle is located at the original oil inlet on the upper end cover of the liquid-floating gyroscope housing and communicates with the internal space of the gyroscope, i.e., the liquid is injected through the oil filling nozzle when injecting the liquid. The internal space adjustment mechanism for the gyroscope includes a screw, a nut, and a baffle. The baffle is welded to the lower end of the liquid-floating gyroscope housing to support and position the process nut. The screw vertically passes through the baffle and the lower end plate (i.e., end piece) of the internal bellows of the liquid-floating gyroscope and connects with the internal space adjustment mechanism. The upper end plate (i.e., the bottom plate) of the bellows is connected to the center of the bottom surface (the bellows is welded to the bottom plate and the end plate to form a bellows assembly, and the end plate is also welded to the shell to form an internal cavity for filling with float liquid. During the design, it is ensured that the length of the bellows at low temperature is less than the axial length of the bellows installation space. Holes for the screw to pass through are opened on the baffle and the holes are all located in the center); the nut is located on the outside of the baffle and is threaded to the screw to adjust the degree of expansion and contraction of the bellows. That is, when the float liquid is injected, the size of the internal space of the gyroscope is adjusted by tightening the bellows to precisely control the amount of float liquid injected.

[0058] The method for injecting the floating liquid using the aforementioned liquid-floating gyroscope liquid injection control device is characterized by the following steps:

[0059] 1) Assemble the above-mentioned liquid-floating gyroscope liquid injection control device onto the liquid-floating gyroscope;

[0060] 2) At room temperature, the bellows of the liquid-floating gyroscope is tightened by the cooperation of the nut and screw, so that the compression of the bellows is greater than or equal to the compression length L of the bellows. 压 The compression length is the amount of compression of the bellows by the floating liquid relative to the free state of the bellows when the liquid-floated gyroscope is used in the highest temperature environment.

[0061] The compressed length L of the bellows 压 Determined by the following method:

[0062] S1. Determine the volume V of the liquid that can be injected into the liquid-floating gyroscope. 液 ;

[0063] V 液 The calculation formula is as follows:

[0064]

[0065] Where: V0—total volume of the cavity of the liquid-floating gyroscope housing;

[0066] Vi—refers to the volume of other necessary components inside the liquid-float gyroscope (such as: signaler, torque generator, float, bellows), i = 1, 2, 3....n;

[0067] S2. Determine the bellows compensation amount V补偿 ;

[0068] The bellows compensation amount V 补偿 It equals the change in volume of the floating liquid, ΔV;

[0069] The formula for calculating the change in volume of the flotation liquid, ΔV, is as follows:

[0070] △V=V 高 -V 低

[0071] In the formula:

[0072] V 高 —Floating liquid V 液 Volume at high temperature;

[0073] V 低 —Floating liquid V 液 Volume at low temperatures;

[0074] The high and low temperatures are determined by the requirements of the application environment of the liquid-float gyroscope, and the calculation method is as follows:

[0075] V 高 =V 液 ·(1+k·(T 高 -T 常温 ))

[0076] V 低 =V 液 ·(1-k·(T 常温 -T 低 ))

[0077] In the formula:

[0078] k—coefficient of thermal expansion of the liquid volume, in cm⁻¹ 3 / ℃, refer to relevant flotation data for details;

[0079] T 高 —Highest operating temperature for liquid-float gyroscopes, ℃;

[0080] T 低 —Minimum operating temperature for liquid-float gyroscopes, °C;

[0081] S3. Calculate the compression length L 压

[0082] Based on the bellows compensation amount V obtained in step S2 补偿 Based on the installation space of the bellows in the liquid-floating gyroscope, the appropriate bellows model is initially determined according to the bellows product manual. Those skilled in the art know how to select the model and length in the free state from the product manual provided by the bellows product manufacturer based on the compensation amount and installation space, and determine the bellows extension length L.

[0083] Bellows compression length L 压 The calculation formula is:

[0084] L 压 =L·(T 高 -T 常温 ) / (T 高 -T 低 )

[0085] in:

[0086] T 高 —Highest operating temperature for liquid-float gyroscopes, ℃;

[0087] T 低 —Minimum operating temperature for liquid-float gyroscopes, °C;

[0088] T 常温 —The typical operating temperature for liquid-floated gyroscopes is ℃;

[0089] Simultaneously satisfy:

[0090] L = L 压 +L 低

[0091] L is the expansion and contraction length of the bellows. 压 It is the compressed length of the bellows, L 低 It is the elongation of the bellows at low temperature;

[0092] L2≥L 低 That is, L2≥L0-L 压 ,

[0093] L2 is the distance from the bottom of the bellows to the bottom of the bellows installation space at room temperature, i.e. Figure 2 Distance in;

[0094] 3) With the filling nozzle facing upwards, fill the internal cavity of the liquid-floated gyroscope with floating liquid until it is full at room temperature;

[0095] 4) Keep the oil filling nozzle facing upward and the bellows taut. Place the liquid-floated gyroscope in the highest temperature environment for its application and keep it warm until the temperature of the floating liquid is the same as that of the external environment, so that the internal temperature of the liquid-floated gyroscope can be stabilized.

[0096] 5) Under the highest temperature environment, cut off the oil filling nozzle and clamp and weld it shut; at this time, the volume of the internal floating liquid of the product is V. 高 ;

[0097] 6) Unscrew the nut, remove the baffle, and cut off any excess screw. The floatation injection is now complete.

[0098] As can be seen, during oil filling, this invention utilizes a gyroscope internal space adjustment mechanism formed by a screw, nut, and baffle to tighten the bellows, maximizing the amount of liquid inside the gyroscope. After filling, the same mechanism is used again to tighten the bellows to its maximum, maximizing the oil storage space inside the gyroscope. The gyroscope is then placed in a high-temperature environment for a certain period to stabilize the internal oil temperature. Excess liquid overflows from the filling nozzle. The filling nozzle is then clamped and welded shut, and the nut and baffle are removed. This prevents the bellows from bursting and leaking oil when the gyroscope operates at its highest temperature, while also ensuring maximum liquid volume at low temperatures, thus guaranteeing low-temperature performance. This method is simple in structure and easy to implement. Furthermore, it is applicable to volume control of various liquids and can be directly verified and applied in production.

[0099] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the scope of the technology disclosed in the present invention, and such modifications or substitutions should all be covered within the scope of protection of the present invention.

Claims

1. A method for injecting a liquid into a liquid floated gyroscope using a liquid injection control device, characterized by, The method comprises the following steps: 1) installing a liquid-floated gyroscope liquid injection control device on a liquid-floated gyroscope shell; The liquid-floated gyroscope liquid injection control device comprises a filling nozzle and a gyroscope internal space adjusting mechanism; The filling nozzle is arranged at an original oil injection port of an upper end cover of the liquid-floated gyroscope shell and is in communication with a gyroscope internal space; The gyroscope internal space adjusting mechanism comprises a screw rod, a nut and a baffle; The baffle is installed at a lower end of the liquid-floated gyroscope shell; The screw rod vertically penetrates the baffle and a lower end plate of a liquid-floated gyroscope internal bellows and is connected with a bottom surface of an upper end plate of the bellows; The nut is located outside the baffle and cooperates with the screw rod to adjust an extension degree of the bellows; 2) Under the room temperature environment, the corrugated tube of the liquid floated gyroscope is pulled tight by the nut and screw rod cooperation, so that the compression amount of the corrugated tube is greater than or equal to the compression length L of the corrugated tube 压 ; The compressed length L of the bellows 压 Determined by the following method: S1. Determining the volume of the floatable liquid V that can be injected inside the liquid floated gyroscope 液 ; V 液 The calculation formula is as follows: In the formula, V0 is a total volume of a cavity of the liquid-floated gyroscope shell; Vi is a volume of other components in the liquid-floated gyroscope, i=1, 2, 3,..., n; S2. Determine the amount of bellows compensation V 补偿 ; The bellows compensation amount V 补偿 is equal to the change in the volume of the float ΔV; A calculation formula of the liquid volume change amount AV is as follows: In the formula, V 高 —float V 液 Volume at high temperature; V 低 —float V 液 Volume at low temperature; The high and low temperatures are determined by the requirements of the liquid floated gyroscope application environment, and V 高 and V 低 The calculation method is as follows: In the formula, k is a thermal expansion coefficient of the liquid volume, which is obtained by referring to relevant liquid data; T 高 — Liquid floating gyroscope application environment maximum temperature; T 低 Minimum temperature of the application environment of the liquid floated gyroscope; T 常温 Liquid floated gyroscope application environment normal temperature; S3. Calculate the compressed length L 压 The bellows compensation amount V obtained according to step S2 补偿 In combination with the installation space of the bellows in the liquid floated gyroscope, the appropriate bellows model and the length in free state are preliminarily determined according to the bellows product manual, and the bellows extension length L is determined. The corrugated tube compression length L 压 The calculation formula is: ； 3) filling the liquid into the cavity of the liquid-floated gyroscope through the filling nozzle in an upward direction under a room temperature environment until the cavity is filled; 4) keeping the filling nozzle in the upward direction and keeping the bellows in a tensioned state, placing the liquid-floated gyroscope in a highest temperature environment for heat preservation until a temperature in the liquid-floated gyroscope reaches stability; 5) cutting off the filling nozzle and clamping and welding a seal under the highest temperature environment; 6) unscrewing the nut, removing the baffle, cutting off the excess screw rod, and completing the liquid injection.

2. The liquid injection method according to claim 1, characterized in that: The method can accurately control an injection amount of the liquid-floated gyroscope.

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