Piston type hydraulic energy accumulator with oil level indication function

Abstract

The invention belongs to the technical field of mechanical hydraulic pressure, and particularly relates to a piston type hydraulic energy accumulator with an oil level indication function. One side of a piston (26) is a hydraulic oil cavity, and the other side of the piston (26) is a nitrogen cavity; comprising a pull rope assembly and a hydraulic oil level indication assembly. One end of the pull rope assembly is fixedly connected with the center of the end face of the side, close to the hydraulic oil cavity, of the piston (26), the other end of the pull rope assembly is connected with the hydraulic oil level indicating assembly, and the oil level state of the hydraulic oil cavity is displayed in real time through the hydraulic oil level indicating assembly. According to the piston type hydraulic energy accumulator with the oil level indication function, the volume of oil in the hydraulic oil cavity in the piston type hydraulic energy accumulator can be judged according to the color scale position of the oil level indication sliding block on the hydraulic oil level indication color identification scale pipe shell.

Description

Technical Field

[0001] This invention belongs to the field of mechanical hydraulic technology, and in particular relates to a piston-type hydraulic accumulator with an oil level indicator. Background Technology

[0002] Piston-type hydraulic accumulators are crucial in aircraft hydraulic system design. The hydraulic system accumulator employs a piston-type structure. The nitrogen chamber of the piston-type hydraulic accumulator is filled with nitrogen at a certain pressure. The hydraulic oil chamber of the piston-type hydraulic accumulator is connected to the hydraulic system. When the hydraulic system pressure fluctuates or an emergency flow supply is needed, the piston inside the piston-type accumulator cylinder moves, changing the volume of the nitrogen chamber and the hydraulic oil chamber. The piston-type hydraulic accumulator replenishes the hydraulic oil in the hydraulic oil chamber to actuated components in the hydraulic system that are leaking oil, such as hydraulic tanks, hydraulic valves, and actuators, through piston movement.

[0003] The total volume and pre-charge pressure of a piston-type hydraulic accumulator determine its function and performance, and are closely related to the flow rate and pressure of the hydraulic system. The volume changes of the nitrogen chamber and hydraulic oil chamber are primarily indicated by the position of the internal piston. The piston's position is closely related to factors such as hydraulic system pressure pulse fluctuations and changes in gas pressure and temperature within the nitrogen chamber. Therefore, accurately determining the piston's position within the hydraulic accumulator is crucial. When hydraulic system depressurization is required, the piston-type hydraulic accumulator needs to be depressurized. During hydraulic oil chamber depressurization, the relative position of the piston within the cylinder must be accurately determined. When the piston is at the end of the hydraulic oil chamber within the accumulator cylinder, it indicates that the hydraulic oil has been completely drained. Similarly, when the piston is at the end of the nitrogen chamber within the accumulator cylinder, it indicates that the nitrogen gas has been completely drained. Furthermore, in the actual use of piston-type hydraulic accumulators, it is necessary to accurately identify the internal position of the piston, accurately grasp the actual application conditions of the piston-type hydraulic accumulator, monitor the operating status of the product in real time, and prevent the product from failing due to internal piston jamming.

[0004] When ground maintenance personnel perform maintenance, if the piston-type hydraulic accumulator is equipped with an oil level indicator, the piston's position inside the product can be easily and quickly determined. If the piston position of the piston-type hydraulic accumulator is abnormal, the risk can be identified in a timely manner and ground maintenance can be carried out. When the piston-type hydraulic accumulator needs to be inflated, in addition to the normal display of the gas pressure gauge through the nitrogen pump, it is also necessary to identify the real-time position of the inflation piston. By identifying the actual position of the piston inside the cylinder, the inflation status of the product can be determined, thereby identifying potential risks in the inflation process. For example, if the piston is stuck in a fixed position inside the cylinder, if the product is continuously inflated by the air pump, the excessive gas pressure will cause accidental damage to the cylinder and piston, and in severe cases, may even threaten the personal safety of ground operators.

[0005] Traditional oil level monitoring with linear variable differential transformers (LVDTs) has many problems, such as high cost, excessive weight and size, limited dynamic response frequency, temperature drift, high installation and alignment accuracy requirements, and susceptibility to electromagnetic interference and core hysteresis. Therefore, using LVDTs to monitor oil levels in aviation piston hydraulic accumulators would present many problems, with very high requirements for onboard or experimental installation, making it unsuitable for routine operating conditions. Summary of the Invention

[0006] The purpose of this invention is to provide a piston-type hydraulic accumulator with an oil level indicator to solve the above-mentioned problems.

[0007] The technical solution of the present invention: In order to achieve the above-mentioned objective, according to the first aspect of the present invention, a piston-type hydraulic accumulator with an oil level indicator is proposed. One side of the piston (26) is a hydraulic oil chamber and the other side is a nitrogen chamber. It includes a pull rope assembly and a hydraulic oil level indicator assembly. One end of the pull rope assembly is fixedly connected to the center of the end face of the piston (26) near the hydraulic oil chamber, and the other end is connected to the hydraulic oil level indicator assembly. The hydraulic oil level indicator assembly displays the oil level status of the hydraulic oil chamber in real time.

[0008] In one possible embodiment, the pull rope assembly includes a hydraulic oil level indicator initial end sliding rope (19), a hydraulic oil level indicator initial end pulley mechanism (20), and a hydraulic oil level indicator middle end pulley mechanism (14); the pulley shaft of the hydraulic oil level indicator initial end pulley mechanism (20) is fixed to the piston (26), one end of the hydraulic oil level indicator initial end sliding rope (19) is fixedly connected to the center of the piston (26), the hydraulic oil level indicator initial end sliding rope (19) passes around the hydraulic oil level indicator initial end pulley mechanism (20), the pulley shaft of the hydraulic oil level indicator middle end pulley mechanism (14) is fixed to the inner cavity of the piston-type hydraulic accumulator, and the hydraulic oil level indicator initial end sliding rope (19) passes around the hydraulic oil level indicator middle end pulley mechanism (14) and exits the piston-type hydraulic accumulator cavity to connect with the hydraulic oil level indicator assembly.

[0009] In one possible embodiment, the hydraulic level indicator assembly includes an outer housing (30) with a hydraulic level indicator, a hydraulic level indicator mid-end connecting sealing sliding block (8), a hydraulic level indicator color-coded scale tube (1), a hydraulic level indicator sliding block (3), a hydraulic level indicator spring (4), and a hydraulic level indicator end sliding rope (5); the open end of the outer housing (30) with the hydraulic level indicator communicates with the piston-type hydraulic accumulator cavity, and the hydraulic level indicator mid-end connecting sealing sliding block (8) is disposed at the communication point and communicates with the hydraulic level indicator. The outer housing (30) of the indicator is sealed and slidingly fitted. The hydraulic oil level indicator color mark scale tube (1) is fixed inside the outer housing (30) of the indicator with hydraulic oil level indicator. One end of the hydraulic oil level indicator end sliding rope (5) is fixedly connected to the hydraulic oil level indicator middle end sealing sliding block (8), and the other end is connected to the hydraulic oil level indicator sliding block (3). One end of the hydraulic oil level indicator spring (4) abuts against the inner wall of the hydraulic oil level indicator color mark scale tube (1), and the other end abuts against the hydraulic oil level indicator sliding block (3).

[0010] In one possible embodiment, the hydraulic oil level indicator color marking scale tube shell (1) is arranged parallel to the piston-type hydraulic accumulator. The hydraulic oil level indicator assembly also includes a hydraulic oil level indicator end pulley mechanism (6). The pulley shaft of the hydraulic oil level indicator end pulley mechanism (6) is fixed to the outer housing (30) of the indicator with hydraulic oil level indication. The hydraulic oil level indicator end sliding rope (5) passes around the hydraulic oil level indicator end pulley mechanism (6) to achieve a 90-degree angle change.

[0011] In one possible embodiment, the hydraulic oil level indicator color marking scale shell (1) is provided with a first color segment, a second color segment, and a third color segment in sequence.

[0012] In one possible embodiment, a hydraulic accumulator piston limiting block (18) with an oil level indicator is also included. The hydraulic accumulator piston limiting block (18) with an oil level indicator is annular and fixed to the inner wall of the hydraulic oil chamber on one side of the piston-type hydraulic accumulator. Due to the action of the hydraulic accumulator piston limiting block (18) with an oil level indicator, the piston assembly of the piston-type hydraulic accumulator with an oil level indicator will not move to the right indefinitely, and will eventually stop at the right limit position of the outer cylinder (17) of the piston-type hydraulic accumulator with an oil level indicator.

[0013] In one possible embodiment, a hydraulic oil level indicator sliding block limiter (7) is also included, which is fixed inside the outer housing (30) of the indicator with hydraulic oil level indicator and is used to limit the sliding of the sealing sliding block (8) connected to the middle of the hydraulic oil level indicator.

[0014] According to a second aspect of the invention, an aircraft hydraulic system is provided, comprising the aforementioned piston-type hydraulic accumulator with an oil level indicator.

[0015] Beneficial effects of the present invention Compared with the prior art, the present invention has the following advantages: 1. Piston-type hydraulic accumulators with oil level indicators have a hydraulic oil level indication function. These accumulators can determine the volume of hydraulic fluid in their internal chambers by observing the position of the oil level indicator slider on the color-coded scale of the hydraulic oil level indicator. When the oil level indicator slider is in the red position of the scale, it indicates a low oil level; when it is in the yellow position, it indicates a medium oil level; and when it is in the green position, it indicates a high oil level.

[0016] 2. Piston-type hydraulic accumulators with oil level indicators can reflect the real-time position of the piston assembly within the long, deep-hole outer cylinder of the piston-type hydraulic accumulator. When the oil level indicator slider is within the red scale range of the hydraulic oil level indicator color marking on the casing, it indicates that the hydraulic accumulator piston assembly is in a position close to the right limit; when the oil level indicator slider is within the yellow scale range of the hydraulic oil level indicator color marking on the casing, it indicates that the hydraulic accumulator piston assembly is in a position in the middle of the outer cylinder of the hydraulic accumulator; when the oil level indicator slider is within the green scale range of the hydraulic oil level indicator color marking on the casing, it indicates that the hydraulic accumulator piston assembly is in a position close to the left limit.

[0017] 3. The nitrogen chamber safety protection component of the piston-type hydraulic accumulator with oil level indication can effectively ensure the safety of the nitrogen chamber and can provide pressure relief protection when the nitrogen gas pressure in the nitrogen chamber exceeds the safety threshold.

[0018] 4. The hydraulic oil chamber safety protection component of the piston-type hydraulic accumulator with oil level indication can effectively ensure the safety of the hydraulic oil chamber and can provide pressure relief protection when the hydraulic oil pressure in the hydraulic oil chamber exceeds the safety threshold. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a piston-type hydraulic accumulator with an oil level indicator according to a preferred embodiment of the present invention. Figure 2 This is a schematic diagram of an existing piston-type hydraulic accumulator. Figure 3 This is a schematic diagram of the working principle of a piston-type hydraulic accumulator with an oil level indicator in actual use. Figure 4 This is a cross-sectional view of the oil level indicator component according to a preferred embodiment of the present invention; Figure 5 This is a longitudinal sectional view of the oil level indicator component according to a preferred embodiment of the present invention; Figure 6 This is a detailed diagram of the hydraulic oil level indicator end pulley mechanism 6 according to a preferred embodiment of the present invention. Figure 7 This is a detailed internal view of the hydraulic oil level indicator color marking scale tube shell 1 according to a preferred embodiment of the present invention; Figure 8 This is a detailed view of the connection portion of the pull rope assembly and the hydraulic oil level indicator assembly according to a preferred embodiment of the present invention; Figure 9 This is a three-dimensional detail view of the hydraulic oil level indicator color marking scale tube shell 1 according to a preferred embodiment of the present invention; Figure 10 This is a schematic diagram of the piston 26 of the piston-type hydraulic accumulator with oil level indicator and the hydraulic oil level indicator initial end pulley mechanism 20 in a preferred embodiment of the present invention. Figure 11 This is a detailed diagram showing the connection between the hydraulic oil level indicator initial end sliding rope 19, the piston-type hydraulic accumulator piston 26 with oil level indicator, and the hydraulic oil level indicator initial end pulley mechanism 20 in a preferred embodiment of the present invention. Figure 12 This is a cross-sectional view of the connection between the piston 26 of the piston-type hydraulic accumulator with oil level indicator and the hydraulic oil level indicator initial end pulley mechanism 20 according to a preferred embodiment of the present invention. Figure 13 This is a partially enlarged view of the connection between the piston 26 of the piston-type hydraulic accumulator with oil level indicator and the hydraulic oil level indicator initial end pulley mechanism 20 according to a preferred embodiment of the present invention. Figure 14This is a detailed view of the connection between the hydraulic oil level indicator pulley mechanism 14 and the piston-type hydraulic accumulator outer cylinder 17 with oil level indicator in a preferred embodiment of the present invention. Figure 15 This is a schematic diagram illustrating the design principle of the length of the sliding rope 19 at the initial end of the hydraulic oil level indicator according to a preferred embodiment of the present invention.

[0021] In the diagram: 1- Hydraulic oil level indicator color-coded scale housing; 2- Hydraulic oil level indicator sliding block support ring; 3- Oil level indicator sliding block; 4- Hydraulic oil level indicator spring; 5- Hydraulic oil level indicator end sliding rope; 6- Hydraulic oil level indicator end pulley mechanism; 7- Hydraulic oil level indicator sliding block limiter; 8- Hydraulic oil level indicator middle connecting sealing sliding block; 9- First hydraulic oil level indicator sliding block support ring; 10- Hydraulic oil level indicator sliding block combination sealing ring; 11- Second hydraulic oil level indicator sliding block support ring; 12- Hydraulic oil level indicator device fixed connector; 13- Hydraulic oil chamber overflow valve; 14- Hydraulic oil level indicator. 15-Hydraulic oil filter; 16-Hydraulic oil chamber pipe joint for piston-type hydraulic accumulator; 17-Outer cylinder of piston-type hydraulic accumulator; 18-Piston limit block of hydraulic accumulator with oil level indicator; 19-Sliding rope at the initial end of hydraulic oil level indicator; 20-Pulley mechanism at the initial end of hydraulic oil level indicator; 21-First piston support ring of piston-type hydraulic accumulator; 22-Piston combination seal ring of first piston-type hydraulic accumulator; 23-Piston support ring of second piston-type hydraulic accumulator; 24-Piston combination seal ring of second piston-type hydraulic accumulator; 25-Piston support ring of third piston-type hydraulic accumulator. ; 26- Piston of a piston-type hydraulic accumulator with oil level indicator; 27- Nitrogen chamber connector of a piston-type hydraulic accumulator with oil level indicator; 28- Nitrogen gas filter; 29- Nitrogen chamber overflow valve; 30- Outer housing of a position indicator with hydraulic oil level indicator; 31- Hydraulic oil level indicator color-coded scale tube housing gasket; 32- Nitrogen chamber connector; 33- Accumulator outer cylinder; 34- First piston support ring; 35- Piston combination seal ring; 36- Second piston support ring; 37- Piston; 38- Hydraulic oil chamber connector; 39- Nitrogen chamber shut-off valve; 40- Hydraulic solenoid valve; 41- Hydraulic oil filter; 42- - Constant pressure variable pump; 43- Hydraulic oil tank; 44- Flange fixing bolts; 45- Flange mounting plate; 46- Hydraulic oil level indicator end pulley pin; 47- Hydraulic oil level indicator end pulley; 48- Hydraulic oil level indicator end pulley bracket; 49- End connection threaded plug; 50- Middle connection threaded end plug; 51- Middle connection threaded first plug; 52- Initial end threaded plug; 53- Hydraulic oil level indicator fixing pin; 54- Hydraulic oil level indicator initial end fixing bracket; 55- Hydraulic oil level indicator middle end fixing bracket; 56- Hydraulic oil level indicator middle end pulley; 57- Hydraulic oil level indicator middle end fixing pin. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0024] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] This invention provides a piston-type hydraulic accumulator with an oil level indicator, such as... Figure 1 and Figure 3As shown, the device includes a piston-type hydraulic accumulator nitrogen chamber pipe connector 27 with oil level indication, a piston-type hydraulic accumulator hydraulic oil chamber pipe connector 16 with oil level indication, a hydraulic oil chamber safety protection component, a nitrogen chamber safety protection component, a piston-type hydraulic accumulator piston assembly with oil level indication, a piston-type hydraulic accumulator outer cylinder 17 with oil level indication, an indicator outer housing 30 with hydraulic oil level indication, a hydraulic oil level indicator color marking scale housing 1, a hydraulic oil level indicator sliding block 3, a second hydraulic oil level indicator sliding block support ring, a hydraulic oil level indicator spring 4, a hydraulic oil level indicator end sliding rope 5, a hydraulic oil level indicator initial end sliding rope 19, a hydraulic oil level indicator end pulley mechanism 6, a hydraulic oil level indicator middle pulley mechanism 14, a hydraulic oil level indicator initial end pulley mechanism 20, a hydraulic oil level indicator sliding block limiter 7, a hydraulic oil level indicator middle end connecting sealing sliding block 8, and a hydraulic oil level indicator device fixed connector 1. 2. A hydraulic accumulator piston limiting block 18 with oil level indicator, a hydraulic oil level indicator sliding block combination sealing ring 10, a first hydraulic oil level indicator sliding block support ring 9, a second hydraulic oil level indicator sliding block support ring 11, a hydraulic oil level indicator sliding block support ring 3, 23, etc.

[0026] In one embodiment, the piston assembly of the piston-type hydraulic accumulator with oil level indication includes: a piston-type hydraulic accumulator piston 26 with oil level indication, a piston-type hydraulic accumulator piston support ring 21, a piston-type hydraulic accumulator piston support ring 23, a piston-type hydraulic accumulator piston support ring 25, a piston-type hydraulic accumulator piston combination seal ring 22, and a piston-type hydraulic accumulator piston combination seal ring 24.

[0027] In one embodiment, the hydraulic oil chamber safety protection component includes a hydraulic oil chamber overflow valve 13 and a connecting fuse, etc.; the nitrogen chamber safety protection component includes a nitrogen chamber overflow valve 29 and a connecting fuse, etc. The hydraulic oil chamber overflow valve 13 is mainly used for overload pressure relief protection when the hydraulic oil chamber is overpressurized. The hydraulic oil filter 15 is mainly used to filter external impurities during pressure relief protection to prevent them from entering the hydraulic oil chamber and contaminating the product oil, thereby preventing contamination of the aircraft hydraulic system oil. Similarly, the nitrogen chamber overflow valve 29 is mainly used for overload pressure relief protection when the nitrogen chamber is overpressurized. The nitrogen gas filter 28 is mainly used to filter external impurities during pressure relief protection to prevent them from entering the nitrogen chamber and contaminating the nitrogen gas inside the product.

[0028] In one embodiment, before the piston-type hydraulic accumulator with oil level indicator is used, the nitrogen chamber of the product needs to be filled with gas at a certain pressure using a nitrogen gas source pump, so that the gas pressure in the nitrogen chamber reaches a certain value. At this time, the piston assembly of the piston-type hydraulic accumulator with oil level indicator is pushed to the limit position of the hydraulic oil chamber under the action of gas pressure. Due to the action of the piston limiting block 18 of the hydraulic accumulator with oil level indicator, the piston assembly of the piston-type hydraulic accumulator with oil level indicator will not move to the right indefinitely, and will eventually stop at the right end limit position of the outer cylinder 17 of the piston-type hydraulic accumulator with oil level indicator. At this time, the hydraulic oil level indicator slider 3 reaches the end of the red scale on the left side of the oil level indicator under the pushing action of the hydraulic oil level indicator spring 4. At this time, the oil level inside the piston hydraulic accumulator reaches the lowest value. The movement of the oil level indicator slider 3 is synchronized with the movement of the piston assembly of the piston hydraulic accumulator with oil level indication through the pulley mechanism. When the oil level is low, the piston hydraulic accumulator is at its weakest in terms of the ability of the hydraulic system to resist instantaneous pressure shocks, absorb pressure pulsations, and replenish leaked oil inside the hydraulic product.

[0029] In one embodiment, when the piston-type hydraulic accumulator with oil level indicator is connected to the aircraft hydraulic system through the hydraulic oil chamber connector 16 of the piston-type hydraulic accumulator with oil level indicator, the oil pressure in the hydraulic oil chamber will be consistent with the pressure of the aircraft hydraulic system. At this time, the piston 26 of the piston-type hydraulic accumulator with oil level indicator will move towards the nitrogen chamber under the action of the system oil pressure. The piston 26 of the piston-type hydraulic accumulator with oil level indicator is fixedly connected to the oil level indicating sliding block 3 of the oil level indicating device through the hydraulic oil level indicator end sliding rope 5, the hydraulic oil level indicator initial end sliding rope 19, the hydraulic oil level indicator end pulley mechanism 6, the hydraulic oil level indicator middle pulley mechanism 14, and the hydraulic oil level indicator initial end pulley mechanism 20.

[0030] In one embodiment, the lower end of the hydraulic oil level indicator connecting sealing sliding block 8 is fixedly connected to the piston 26 of the piston-type hydraulic accumulator with oil level indication via the hydraulic oil level indicator initial end sliding rope 19, and the upper end of the hydraulic oil level indicator connecting sealing sliding block 8 is fixedly connected to the oil level indicator sliding block 3 via the hydraulic oil level indicator end sliding rope 5.

[0031] In one embodiment, the movements of the three components—the oil level indicating sliding block 3, the hydraulic oil level indicating mid-end connecting sealing sliding block 8, and the piston 26 of the piston-type hydraulic accumulator with oil level indication—are highly correlated. Specifically, when the piston 26 of the piston-type hydraulic accumulator with oil level indication moves to the left, the hydraulic oil chamber is filled with oil, and oil from the hydraulic system enters the hydraulic oil chamber of the piston-type hydraulic accumulator, increasing the amount of oil in the hydraulic oil chamber. The oil level indicating sliding block 3 moves towards the green mark on the hydraulic oil level indicator color-coded scale shell 1, indicating that the amount of oil in the hydraulic oil chamber is gradually increasing. When the piston 26 of the piston-type hydraulic accumulator with oil level indication moves to the right, oil is released from the hydraulic oil chamber, and oil stored in the piston-type accumulator enters the hydraulic system, decreasing the amount of oil in the hydraulic oil chamber. The oil level indicating sliding block 3 moves towards the red mark on the hydraulic oil level indicator color-coded scale shell 1, indicating that the amount of oil in the hydraulic oil chamber is gradually decreasing.

[0032] In one embodiment, the oil level indicating slider 3 bears the elastic force of the hydraulic oil level indicating spring 4, the frictional force between the hydraulic oil level indicating slider support ring 2 and the hydraulic oil level indicating color mark scale tube shell 1, and the tensile force of the hydraulic oil level indicating end sliding rope 5.

[0033] In one embodiment, the piston 26 of the piston-type hydraulic accumulator with oil level indicator is fixedly connected to the sealing sliding block 8 at the middle end of the hydraulic oil level indicator via a sliding rope 19 at the initial end of the hydraulic oil level indicator. The oil level indicator sliding block 3 is fixedly connected to the sealing sliding block 8 at the middle end of the hydraulic oil level indicator via a sliding rope 5 at the end of the hydraulic oil level indicator. During operation, the bottom of the sealing sliding block 8 at the middle end of the hydraulic oil level indicator bears the pressure load of the hydraulic oil chamber. The area on the right side of the piston-type hydraulic accumulator piston 26 with oil level indicator that bears the hydraulic oil pressure load is larger than the area on the lower part of the sealing sliding block 8 at the middle end of the hydraulic oil level indicator that bears the hydraulic oil pressure load.

[0034] In one embodiment, the piston 26 of the piston-type hydraulic accumulator with oil level indicator is subjected to various forces, including the nitrogen gas pressure in the nitrogen chamber, the pressure in the right hydraulic oil chamber, the friction between the piston assembly of the piston-type hydraulic accumulator with oil level indicator and the outer cylinder 17 of the piston-type hydraulic accumulator with oil level indicator, and the tension of the sliding rope 19 at the initial end of the hydraulic oil level indicator. Under the action of these various forces, the piston 26 of the piston-type hydraulic accumulator with oil level indicator is in a state of dynamic equilibrium.

[0035] In one embodiment, the hydraulic oil level indicator initial end pulley mechanism 20 is fixedly connected to the piston 26 of the piston-type hydraulic accumulator by welding.

[0036] In one embodiment, the hydraulic oil level indicator initial end pulley mechanism 20 is connected to the middle position of the piston 26 of the piston-type hydraulic accumulator, which helps to ensure the centering and stability of the piston 26 of the piston-type hydraulic accumulator during operation inside the piston-type hydraulic accumulator outer cylinder 17 with oil level indicator.

[0037] In one embodiment, the hydraulic oil level indicator pulley mechanism 14 is fixedly connected to the outer cylinder 17 of the piston-type hydraulic accumulator by welding.

[0038] In one embodiment, the hydraulic oil level indicator end pulley mechanism 6 is fixedly connected to the outer housing 30 of the indicator with hydraulic oil level indication by welding.

[0039] In one embodiment, the hydraulic accumulator piston limit block 18 with oil level indicator is fixedly connected to the outer cylinder 17 of the piston-type hydraulic accumulator by welding.

[0040] In one embodiment, the hydraulic oil level indicator sliding block limiter 7 is fixedly connected to the outer housing 30 of the indicator with hydraulic oil level indication by welding.

[0041] Furthermore, the outer housing 30 of the indicator with hydraulic oil level indication is fixedly connected to the hydraulic oil level indicator head 12 by a threaded connection.

[0042] In one embodiment, the hydraulic oil level indicator fixed connector 12 is fixedly connected to the outer cylinder 17 of the piston-type hydraulic accumulator with oil level indication by welding.

[0043] In one embodiment, the outer housing 30 of the indicator with hydraulic oil level is fixedly connected to the outer cylinder 17 of the piston hydraulic accumulator by a threaded connection. The threaded joint adopts a detachable structure. If the piston accumulator does not require the oil level indication function, the part with the oil level indication is removed and then tightened with an aviation plug with threaded seal. The threads of the aviation plug are coated with sealing and anti-loosening glue. If the aviation plug is used for sealing for a long time, further anti-loosening treatment is required.

[0044] In one embodiment, the first piston support ring 21 of the piston-type hydraulic accumulator is made of carbon fiber-filled polytetrafluoroethylene reinforced composite material.

[0045] In one embodiment, the piston support ring 23 of the second piston-type hydraulic accumulator is made of carbon fiber-filled polytetrafluoroethylene reinforced composite material.

[0046] Furthermore, the piston support ring 25 of the third piston-type hydraulic accumulator is made of polytetrafluoroethylene reinforced composite material filled with carbon fiber.

[0047] In one embodiment, the first hydraulic level indicating sliding block support ring 9 is a carbon fiber-filled polytetrafluoroethylene reinforced composite material.

[0048] In one embodiment, the second hydraulic level indicator sliding block support ring 11 is a carbon fiber-filled polytetrafluoroethylene reinforced composite material.

[0049] In one embodiment, the hydraulic oil level indicator sliding block support ring 2 is made of carbon fiber-filled polytetrafluoroethylene reinforced composite material.

[0050] In one embodiment, the piston assembly seal 22 of the first piston-type hydraulic accumulator is made of EPDM rubber material resistant to aviation hydraulic oil.

[0051] In one embodiment, the piston assembly seal 24 of the second piston-type hydraulic accumulator is made of EPDM rubber material resistant to aviation hydraulic oil.

[0052] In one embodiment, the hydraulic oil level indicator sliding block combination seal ring 10 is made of EPDM rubber material resistant to aviation hydraulic oil.

[0053] In one embodiment, the hydraulic oil level indicator end pulley mechanism 6, the hydraulic oil level indicator middle pulley mechanism 14, and the hydraulic oil level indicator initial pulley mechanism 20 are made of corrosion-resistant stainless steel material that is resistant to aviation hydraulic oil.

[0054] In one embodiment, the piston 26 of the piston-type hydraulic accumulator is made of aluminum alloy, with the outer surface hard anodized and the inner surface sulfuric acid anodized.

[0055] In one embodiment, the hydraulic oil level indicator is connected to a sealing sliding block 8 made of aluminum alloy, with the outer surface hard anodized and the inner surface sulfuric acid anodized.

[0056] In one embodiment, the oil level indicator slider 3 is made of aluminum alloy, with the outer surface hard anodized and the inner surface sulfuric acid anodized.

[0057] In one embodiment, both the initial sliding rope 19 and the final sliding rope 5 of the hydraulic oil level indicator are made of composite materials that are resistant to aviation hydraulic oil for a long time.

[0058] In one embodiment, the hydraulic oil level indicator color marking scale housing 1 is painted with different colors of paint. The surface scale lines are processed by laser engraving. First, the scale line surface is coated with primer, and finally, different colors of topcoat are coated. During the spraying process, color transition is allowed between adjacent surfaces.

[0059] In one embodiment, the nitrogen chamber connector 27 of the piston-type hydraulic accumulator is made of stainless steel.

[0060] In one embodiment, the hydraulic oil chamber connector 16 of the piston-type hydraulic accumulator is made of stainless steel.

[0061] In one embodiment, the outer cylinder 17 of the piston-type hydraulic accumulator is made of ultra-high strength steel.

[0062] In one embodiment, the outer housing 30 of the indicator with hydraulic oil level indication is made of aluminum alloy, with the outer surface hard anodized and the inner surface sulfuric acid anodized.

[0063] Furthermore, the hydraulic oil level indicator color marking scale tube shell 1 is made of aluminum alloy material, with the outer surface subjected to hard anodizing treatment and the inner surface subjected to sulfuric acid anodizing treatment.

[0064] In one embodiment, the first piston support ring 21, the second piston support ring 23, the third piston support ring 25, the first piston piston combination seal ring 22, and the second piston piston combination seal ring 24 of the piston-type hydraulic accumulator are placed in the corresponding annular rectangular mounting grooves of the piston piston 26 with an oil level indicator. The annular rectangular mounting grooves need to undergo fine treatment such as surface polishing, and special assembly tools are used to install the seal rings and support rings and other parts to prevent damage to the seal rings and support rings and other parts during installation.

[0065] In one embodiment, the hydraulic oil level indicator sliding block support ring 2 is placed in the corresponding annular rectangular mounting groove of the oil level indicator sliding block 3. The annular rectangular mounting groove needs to be refined by surface polishing and other fine treatments, and special assembly tools are used to install parts such as the sealing ring and support ring to prevent damage to the sealing ring and support ring during the installation process.

[0066] In one embodiment, the first hydraulic oil level indicating sliding block support ring 9, the hydraulic oil level indicating sliding block combination sealing ring 10, and the second hydraulic oil level indicating sliding block support ring 11 are placed in the corresponding annular rectangular mounting groove of the hydraulic oil level indicating middle connecting sealing sliding block 8 in a top-to-bottom order. The annular rectangular mounting groove needs to be refined by surface polishing and other fine treatments, and special assembly tools are used to install the sealing ring and support ring and other parts to prevent damage to the sealing ring and support ring and other parts during the installation process.

[0067] In one embodiment, before use, the piston-type hydraulic accumulator with oil level indicator needs to be filled with nitrogen gas at a certain pressure through the nitrogen chamber pipe connector 27 of the piston-type hydraulic accumulator with oil level indicator.

[0068] In one embodiment, the piston-type hydraulic accumulator with oil level indicator is connected to the hydraulic lines of the aircraft hydraulic system via the hydraulic oil chamber connector 16 of the piston-type hydraulic accumulator with oil level indicator during use.

[0069] In one embodiment, the nitrogen chamber safety protection component is fixedly connected to the outer cylinder 17 of the piston-type hydraulic accumulator with an oil level indicator by means of a threaded connection tail expansion plug of the nitrogen chamber overflow valve 29.

[0070] In one embodiment, the hydraulic oil chamber safety protection component is fixedly connected to the outer cylinder 17 of the piston-type hydraulic accumulator with an oil level indicator by means of a threaded connection tail expansion plug of the hydraulic oil chamber overflow valve 13.

[0071] Its specific working mechanism is as follows: A piston-type hydraulic accumulator with an oil level indicator: Nitrogen gas at a certain pressure is introduced into the nitrogen chamber of the piston-type accumulator, and the nitrogen chamber shut-off valve 38 is closed. The hydraulic oil chamber connector of the piston-type hydraulic accumulator is connected to the aircraft hydraulic system. If the oil pressure in the hydraulic oil chamber... P t1 Greater than the nitrogen gas pressure in the pre-filled nitrogen chamber P t2 Then, the hydraulic accumulator piston assembly will move towards the nitrogen chamber under the pressure of the hydraulic oil, and the nitrogen gas pressure in the nitrogen chamber will increase. P t2 The pressure will gradually increase until the piston 26 of the piston-type hydraulic accumulator with oil level indicator reaches the hydraulic oil pressure. P t1 and nitrogen gas pressure in the nitrogen chamber P t2 Under the influence of the system, the system is in a certain equilibrium position, thereby achieving the purpose of storing energy in the hydraulic system.

[0072] The constant pressure variable pump 42 draws hydraulic oil from the hydraulic oil tank 43. The constant pressure variable pump 42 converts mechanical energy into hydraulic energy and outputs high-pressure hydraulic oil. After passing through the hydraulic oil filter 40 to filter impurities, the clean hydraulic oil flows through the open hydraulic solenoid valve and enters the hydraulic oil chamber of the piston-type hydraulic accumulator with oil level indication through the hydraulic oil chamber pipe joint 16 of the piston-type hydraulic accumulator with oil level indication.

[0073] Because nitrogen gas is pre-filled into the nitrogen chamber, the hydraulic oil chamber pressure is low. Therefore, the piston assembly of the piston accumulator will move to the right until it reaches the limit position of the hydraulic accumulator piston limit block 18 with oil level indication. At this time, the oil level indicator slider 3 is located at the leftmost position of the red scale on the hydraulic oil level indicator color marking tube shell 1. In this state, the hydraulic oil level in the piston hydraulic accumulator is at its lowest.

[0074] Constant pressure variable pump 42 output pressure P s As the pressure gradually increases, the piston 26 of the piston-type hydraulic accumulator with oil level indicator moves to the left. At this time, the hydraulic oil chamber is filled with oil, and the oil in the hydraulic system enters the hydraulic oil chamber of the piston-type hydraulic accumulator. The amount of oil in the hydraulic oil chamber increases, and the oil level indicator slider 3 moves towards the green mark on the hydraulic oil level indicator scale shell 1, indicating that the amount of oil in the hydraulic oil chamber is gradually increasing. After the hydraulic solenoid valve 39 is closed, the piston assembly of the piston-type hydraulic accumulator will eventually reach a constant state.

[0075] Constant pressure variable pump 42 output pressure P s As the hydraulic level gradually decreases, when the piston 26 of the piston-type hydraulic accumulator with oil level indicator moves to the right, oil is released from the hydraulic oil chamber. The oil stored in the piston-type accumulator enters the hydraulic system, reducing the amount of oil in the hydraulic oil chamber. At this time, the piston-type hydraulic accumulator replenishes oil to the hydraulic system, and the oil level indicator slider 3 moves towards the red mark on the hydraulic oil level indicator scale shell 1, indicating that the amount of oil in the hydraulic oil chamber is gradually decreasing. After closing the hydraulic solenoid valve 39, the piston assembly of the piston-type hydraulic accumulator will eventually reach a constant state.

[0076] Constant pressure variable pump 42 output pressure P s When a certain value is reached, the piston 26 of the piston-type hydraulic accumulator with oil level indicator is in the middle range, and the oil level indicator sliding block 3 moves within the yellow scale range of the hydraulic oil level indicator color mark tube shell 1.

[0077] In the aircraft's entire hydraulic system The high-pressure hydraulic oil pressure of the constant pressure variable pump 42 is P s ; The hydraulic pressure in the hydraulic chamber of the piston-type hydraulic accumulator with oil level indicator is: P t1 The piston-type hydraulic accumulator with oil level indicator has a piston 26 and a hydraulic oil pressure action area of ​​[area missing]. A t1 ; The nitrogen gas pressure in the nitrogen chamber of the piston-type hydraulic accumulator with oil level indicator is:P t2 The piston-type hydraulic accumulator with oil level indicator has a piston 26 and a nitrogen gas pressure action area of ​​[area missing]. A t2 ; The combined force of the tension of the sliding rope 19 at the initial end of the hydraulic oil level indicator on the piston 26 of the piston-type hydraulic accumulator with oil level indication, the sealing ring, the support ring, and the frictional resistance of the outer cylinder 17 of the piston-type hydraulic accumulator with oil level indication is: ; When a piston-type hydraulic accumulator with an oil level indicator is in a state of dynamic equilibrium in the hydraulic system, its internal force balance expression is as follows: (1) The hydraulic oil chamber pressure of the piston-type hydraulic accumulator with oil level indication is: (2) The spring force on the oil level indicator slider 3 is The calculation formula is: (3) In formula 3 k The spring constant of the hydraulic oil level indicating spring 4 is... x The elastic deformation of the hydraulic oil level indicating spring 4.

[0078] The force balance calculation formula for oil level indicator slider 3 is as follows: (4) The force balance calculation formula for the hydraulic oil level indicator's intermediate connecting sealing sliding block 8 is as follows: (5) like Figure 15 As shown, the total stroke of the hydraulic oil level indicator initial end sliding rope 19 is such that the total length of the hydraulic oil level indicator initial end sliding rope 19 is greater than its total stroke. The specific length of the hydraulic oil level indicator initial end sliding rope 19 can be flexibly adjusted according to the actual application scenario. (6) Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope 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 technical scope disclosed in the present invention, and these modifications or substitutions should be covered within the protection scope of the present invention.

Claims

1. A piston-type hydraulic accumulator with an oil level indicator, wherein one side of the piston (26) is a hydraulic oil chamber and the other side is a nitrogen chamber; characterized in that, It includes a pull rope assembly and a hydraulic oil level indicator assembly; one end of the pull rope assembly is fixedly connected to the center of the end face of the piston (26) near the hydraulic oil chamber, and the other end is connected to the hydraulic oil level indicator assembly, which displays the oil level status of the hydraulic oil chamber in real time.

2. A piston-type hydraulic accumulator with oil level indication according to claim 1, characterized in that, The pull rope assembly includes a hydraulic oil level indicator initial end sliding rope (19), a hydraulic oil level indicator initial end pulley mechanism (20), and a hydraulic oil level indicator middle end pulley mechanism (14). The pulley shaft of the hydraulic oil level indicator initial end pulley mechanism (20) is fixed to the piston (26). One end of the hydraulic oil level indicator initial end sliding rope (19) is fixedly connected to the center of the piston (26). The hydraulic oil level indicator initial end sliding rope (19) passes around the hydraulic oil level indicator initial end pulley mechanism (20). The pulley shaft of the hydraulic oil level indicator middle end pulley mechanism (14) is fixed to the inner cavity of the piston-type hydraulic accumulator. The hydraulic oil level indicator initial end sliding rope (19) passes around the hydraulic oil level indicator middle end pulley mechanism (14) and exits the piston-type hydraulic accumulator cavity to connect with the hydraulic oil level indicator assembly.

3. A piston-type hydraulic accumulator with oil level indication according to claim 1, characterized in that, The hydraulic oil level indicator assembly includes an outer housing (30) of the indicator with hydraulic oil level indication, a middle connecting sealing sliding block (8) of the hydraulic oil level indicator, a color-coded scale tube housing (1) of the hydraulic oil level indicator, a hydraulic oil level indicator sliding block (3), a hydraulic oil level indicator spring (4), and a sliding rope (5) at the end of the hydraulic oil level indicator; the open end of the outer housing (30) of the indicator with hydraulic oil level indication is connected to the cavity of the piston-type hydraulic accumulator, and the middle connecting sealing sliding block (8) of the hydraulic oil level indicator is disposed at the connection point and is connected to the indicator with hydraulic oil level indication. The outer housing (30) of the device is sealed and slidingly fitted. The hydraulic oil level indicator color mark scale tube (1) is fixed inside the outer housing (30) of the indicator with hydraulic oil level indicator. One end of the hydraulic oil level indicator end sliding rope (5) is fixedly connected to the hydraulic oil level indicator middle end sealing sliding block (8), and the other end is connected to the hydraulic oil level indicator sliding block (3). One end of the hydraulic oil level indicator spring (4) abuts against the inner wall of the hydraulic oil level indicator color mark scale tube (1), and the other end abuts against the hydraulic oil level indicator sliding block (3).

4. A piston-type hydraulic accumulator with oil level indication according to claim 3, characterized in that, The hydraulic oil level indicator color marking scale tube shell (1) is arranged parallel to the piston-type hydraulic accumulator. The hydraulic oil level indicator assembly also includes a hydraulic oil level indicator end pulley mechanism (6). The pulley shaft of the hydraulic oil level indicator end pulley mechanism (6) is fixed to the outer shell (30) of the indicator with hydraulic oil level indication. The hydraulic oil level indicator end sliding rope (5) passes around the hydraulic oil level indicator end pulley mechanism (6).

5. A piston-type hydraulic accumulator with oil level indication according to claim 3, characterized in that, The hydraulic oil level indicator color marking scale tube shell (1) is provided with a first color segment, a second color segment, and a third color segment in sequence.

6. A piston-type hydraulic accumulator with oil level indication according to claim 2, characterized in that, It also includes a hydraulic accumulator piston limiting block (18) with an oil level indicator. The hydraulic accumulator piston limiting block (18) with an oil level indicator is annular and fixed on the inner wall of the hydraulic oil chamber on one side of the piston-type hydraulic accumulator.

7. A piston-type hydraulic accumulator with oil level indication according to claim 3, characterized in that, It also includes a hydraulic oil level indicator sliding block limiter (7), which is fixed inside the outer housing (30) of the indicator with hydraulic oil level indicator, and is used to limit the sliding of the sealing sliding block (8) connected to the middle of the hydraulic oil level indicator.

8. An aircraft hydraulic system comprising a piston-type hydraulic accumulator with an oil level indicator as described in any one of claims 1-7.

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