A safety valve capable of stable operation in high and low temperature environments

Abstract

A safe valve can work stably in high and low temperature environment. It relates to the field of safe valve. The existing safe valve causes the steel ball to be stuck due to unreasonable structure, which seriously affects the normal operation of the lubricating oil system. The utility model discloses a safe movable shell, a nut, a sealing ring, a spring, a steel ball, a spring seat, an oil inlet and an oil outlet. The safe movable shell is provided with an oil inlet and an oil outlet respectively. The safe movable shell is fixedly connected with the nut. The sealing ring is arranged between the safe movable shell and the nut. The spring seat is arranged on the end of the nut close to the steel ball. The spring seat is connected with the safe movable shell and the nut respectively. The spring is arranged between the spring seat and the steel ball. The steel ball is assembled in the oil inlet of the safe movable shell through clearance fit and between the spring. The steel ball is pushed by the lubricating oil pressure. The steel ball pushes the spring to compress the spring. The opening and closing of the oil inlet by the steel ball are realized. The utility model is applied to the field of safe valve of lubricating oil system.

Description

Technical Field

[0001] This utility model relates to the field of lubricating oil system valves. Specifically, it relates to a safety valve that can operate stably in high and low temperature environments. Background Technology

[0002] The safety valve of the aircraft engine lubrication system is an important component to ensure the safe operation of the aircraft engine lubrication system. The safety valve is an automatic valve that is mainly installed in the lubrication system near the outlet of the booster stage of the lubrication pump, and is mainly used to ensure the safety of the lubrication system.

[0003] Currently, issues such as steel ball jamming in safety valves due to unreasonable structure and insufficient machining precision are common. If the safety valve's structural design is flawed, such as an obstructed guide channel for the steel ball, an unreasonable angle, or excessively narrow space, the steel ball is easily subjected to abnormal forces during the lubrication system's operation. This can cause it to deviate from its normal trajectory and become stuck in the channel, unable to reset or move properly. Steel ball jamming can prevent the safety valve from opening or closing normally under the specified pressure, resulting in ineffective pressure control in the lubrication system. Therefore, safety valve jamming in the lubrication system can severely impact the normal operation of the system.

[0004] The content of this utility model

[0005] This invention aims to solve the problem of steel ball jamming caused by unreasonable structure of safety valves, which seriously affects the normal operation of the lubrication system, and provides a safety valve that can work stably in high and low temperature environments.

[0006] The technical solution of this utility model is:

[0007] A safety valve capable of stable operation in high and low temperature environments comprises a safety movable housing, a nut, a sealing ring, a spring, a steel ball, a spring seat, an oil inlet, and an oil outlet.

[0008] The safety movable housing is provided with an oil inlet and an oil outlet respectively. The tail of the safety movable housing is fixedly connected to a nut. A sealing ring is provided between the safety movable housing and the nut. The nut and the sealing ring prevent lubricating oil from leaking from the non-discharge port. A spring seat is provided at the end of the nut near the steel ball. The spring seat is connected to the safety movable housing and the nut respectively. A spring is installed between the spring seat and the steel ball. The end of the spring abuts against the surface of the steel ball.

[0009] The steel ball is fitted between the oil inlet and the spring of the safety movable housing with a clearance fit. The safety valve, which can work stably in high and low temperature environments, pushes the steel ball at the oil inlet with the lubricating oil pressure. The steel ball pushes the spring to compress the spring, thereby opening and closing the oil inlet.

[0010] Furthermore, the nut has a set of locking holes evenly distributed along the axial direction, and the nut has a post for inserting a spring on the side near the oil inlet of the safety movable housing. The post passes through the spring seat and is located inside the safety movable housing.

[0011] Furthermore, the nut and sealing ring seal the safety movable housing near the tail end.

[0012] Furthermore, the spring and spring seat support the steel ball, which seals the oil inlet when there is no pressure outside the safety movable housing.

[0013] Furthermore, the spring seat is horizontally fixed inside the safety movable housing by a nut and a steel ball, and the spring compression is controlled by the pressure at the oil inlet.

[0014] Furthermore, the oil inlet of the safety housing is connected to the lubricating oil pump interface.

[0015] Furthermore, the safety movable housing has a set of oil outlets symmetrically opened on its shaft diameter, which are used for depressurization and oil return.

[0016] Furthermore, the nut is connected to the safety valve housing by a threaded connection, which is used for replacing the nut on the safety valve housing.

[0017] Compared with the prior art, this application has the following advantages:

[0018] This utility model is a safety valve that can work stably in high and low temperature environments. Its simple and stable structure ensures stable performance and low cost, and can effectively protect fly-offs from damage at critical moments.

[0019] This utility model is installed near the booster stage outlet of the lubricating oil pump in the lubricating oil system to ensure the safety of the lubricating oil system. It solves the problems of steel ball jamming caused by unreasonable structure and insufficient machining precision in previous safety valves, reduces flight safety hazards, and improves the environmental adaptability of the safety valve.

[0020] This invention features a set of oil outlets symmetrically positioned along the shaft diameter of the safety movable housing for oil return during pressure relief. Locking holes are also designed at the ends of the safety movable housing for easy fixing to other components. To prevent oil leakage from the non-discharge ports after the safety valve is opened, nuts and sealing rings are installed inside the safety movable housing for sealing. A steel ball is installed inside the safety movable housing, contacting and engaging with the safety valve housing to determine the valve's open position. Springs and spring seats within the safety movable housing support the steel ball, ensuring effective sealing of the valve when there is no external pressure. The oil pressure at the oil inlet pushes the steel ball at the inlet, causing the steel ball to compress the spring, thus opening and closing the oil inlet. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 yes Figure 1 Schematic diagram of the structure in direction A;

[0023] Figure 3 This is a structural schematic diagram of the safety movable shell;

[0024] Figure 4 yes Figure 3 A schematic diagram of the structure along direction B in the middle;

[0025] Figure 5 This is a schematic diagram of the nut structure;

[0026] Figure 6 yes Figure 5 Top view;

[0027] Figure 7 It is the CC section view in 5;

[0028] Figure 8 This is a schematic diagram of the sealing ring structure;

[0029] Figure 9 This is a schematic diagram of the spring structure;

[0030] In the diagram: 1. Safety housing, 2. Nut, 3. Sealing ring, 4. Spring, 5. Steel ball, 6. Spring seat, 7. Oil inlet, 8. Oil outlet. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.

[0032] Specific implementation method one: Combining Figure 1 and Figure 2 This embodiment describes a safety valve that can operate stably in high and low temperature environments. The safety valve includes a safety movable housing 1, a nut 2, a sealing ring 3, a spring 4, a steel ball 5, a spring seat 6, an oil inlet 7, and an oil outlet 8.

[0033] The safety movable housing 1 is provided with an oil inlet 7 and an oil outlet 8 respectively. The tail of the safety movable housing 1 is fixedly connected to the nut 2. A sealing ring 3 is provided between the safety movable housing 1 and the nut 2. The nut 2 and the sealing ring 3 prevent lubricating oil from leaking from the non-discharge port. A spring seat 6 is provided at the end of the nut 2 near the steel ball 5. The spring seat 6 is connected to the safety movable housing 1 and the nut 2 respectively. A spring 4 is installed between the spring seat 6 and the steel ball 5. The end of the spring 4 abuts against the surface of the steel ball 5.

[0034] The steel ball 5 is fitted between the oil inlet 7 and the spring 4 of the safety movable housing 1 with a clearance fit. The safety valve, which can work stably in high and low temperature environments, pushes the steel ball 5 at the oil inlet 7 through the lubricating oil pressure. The steel ball 5 pushes the spring 4 to compress the spring 4, thereby realizing the opening and closing of the oil inlet 7 by the steel ball 5.

[0035] The non-metallic materials used in the safety valves, which can operate stably in high and low temperature environments, are high-temperature alloy materials with technical characteristics such as salt spray resistance, mildew resistance, and acid atmosphere resistance. The selected high-temperature alloy materials are different from the previous stainless steel and heat-resistant steel materials. They are suitable for operation and oil sealing under various aviation synthetic lubricating oil media conditions, and have high strength and corrosion resistance. Tests have verified that they can operate stably under high temperature conditions of 100℃, 130℃, 160℃ and low temperature conditions of -10℃, -20℃, -30℃, and -40℃.

[0036] Under a pressure of 1.4–1.5 MPa, the leakage should not exceed 5 ml within 2 minutes; the valve opening pressure should be (1.8–1.9) MPa; when the valve inlet pressure is 2.5 MPa, the flow rate through the valve should not be less than 38.2 L / min; the safety valve should ensure stable operation under high temperature conditions of 100℃, 130℃, 160℃, and low temperature conditions of -10℃, -20℃, -30℃, and -40℃; the safety valve should undergo 2400 opening and closing tests, and the pressure drop after the tests should not exceed 0.01 MPa. The safety valve should be designed accordingly.

[0037] Specific Implementation Method Two: Combining Figure 3 and Figure 4This embodiment describes a safety valve that can operate stably in high and low temperature environments. The nut 2 has a set of locking holes evenly distributed along the axial direction. The nut 2 has a post for inserting a spring 4 on the side near the oil inlet 7 of the safety movable housing 1. The post passes through the spring seat 6 and is disposed inside the safety movable housing 1.

[0038] The outer contour structure and dimensions of the safety movable housing 1 are designed according to the lubricating oil pump interface size. The size of the oil inlet 7 is calculated based on the lubricating oil flow rate. The oil outlet 8 is designed at the symmetrical position of the shaft diameter of the safety movable housing 1 for use when depressurizing and returning oil.

[0039] Specific implementation method three: Combining Figure 1 — Figure 9 This embodiment describes a safety valve that can operate stably in high and low temperature environments. The nut 2 and the sealing ring 3 seal the safety movable housing 1 near the tail end.

[0040] The sealing ring 3 is a non-metallic part, and the material of the sealing ring 3 is selected to work stably in high and low temperature environments. It effectively avoids problems such as material softening, aging, expansion, deformation or oxidation caused by high temperature, thinning of lubricating oil and reduction of lubrication effect, and material embrittlement, hardening or shrinkage caused by low temperature, thickening of lubricating oil and increase of friction and resistance. It effectively improves the working stability of the safety valve and the working quality in high and low temperature environments.

[0041] Specific Implementation Method Four: Combination Figure 1 — Figure 9 This embodiment describes a safety valve that can operate stably in high and low temperature environments. The spring 4 and spring seat 6 support the steel ball 5, and the steel ball 5 seals the oil inlet 7 when there is no pressure outside the safety movable housing 1.

[0042] Steel ball 5 is fitted between oil inlet 7 and spring with a clearance fit. The diameter of steel ball 5 is calculated based on the lubricating oil flow area. When the pressure at oil inlet 7 increases, the lubricating oil pushes steel ball 5 to compress spring 4, thereby opening the safety valve. Compared to commonly used conical safety valves, the sealing method is optimized from ring-type contact to line contact, improving the product's responsiveness and allowing it to withstand greater eccentricity and runout.

[0043] Specific Implementation Method Five: Combination Figure 1 — Figure 9 This embodiment describes a safety valve that can operate stably in high and low temperature environments. The spring seat 6 is horizontally fixed inside the safety movable housing 1 by the nut 2 and the steel ball 5, and the spring 4 is compressed by the pressure at the oil inlet 7.

[0044] Spring 4 and spring seat 6 are horizontally fixed in the safety movable housing 1 by nut 2 and steel ball 5. The compression of spring 4 is controlled by oil inlet pressure. The size and elastic force of spring 4 are confirmed after calculation and verification to ensure that the required flow rate is achieved under the specified pressure.

[0045] Specific Implementation Method Six: Combination Figure 1 — Figure 9 This embodiment describes a safety valve that can operate stably in high and low temperature environments. The oil inlet 7 of the safety movable housing 1 is connected to the lubricating oil pump interface.

[0046] Set the overpressure threshold as required, calculate the deformation under the working load of the spring, the axial structure and dimensions of the safety movable housing 1, and calculate the lubricating oil flow area based on the design steel ball 5 diameter, etc., to ensure that the safety valve will not malfunction under normal working conditions. When the system exceeds this threshold, the safety valve will quickly open to release the pressure and reach the required flow value.

[0047] Specific Implementation Method Seven: Combination Figure 1 — Figure 9 This embodiment describes a safety valve that can operate stably in high and low temperature environments. The safety movable housing 1 has a set of oil outlets 8 symmetrically opened on its shaft diameter. The oil outlets 8 are used for pressure relief and oil return.

[0048] The outer dimensions of the safety valve housing are designed based on the lubricating oil pump interface dimensions to ensure compatibility with the pump. Material selection is based on the safety valve's operating environment (ambient temperature, temperature change rate, etc.), working medium (medium temperature, temperature change rate, pressure, compatibility, etc.), flight altitude, pressure requirements, tri-proof (water, electricity, gas, and air resistance) requirements, and domestic production considerations. To ensure efficient and stable operation of the safety valve, a sealing structure using a steel ball and pointed edge is specifically chosen. The safety valve housing contains a nut 2, a sealing ring 3, a spring seat 6, a spring 4, and a steel ball 5. The safety valve opens and closes by controlling the compression of spring 4 through lubricating oil pressure, which in turn controls the movement of steel ball 5.

[0049] Specific Implementation Method Eight: Combination Figure 1 — Figure 9 This embodiment describes a safety valve that can operate stably in high and low temperature environments. The nut 2 is connected to the safety valve housing 1 by a threaded connection, which facilitates maintenance and replacement of the nut 2 and the safety valve housing 1.

[0050] Nut 2 and sealing ring 3 provide a seal to prevent lubricating oil from leaking from the non-discharge port after the safety valve is opened. Steel ball 5 contacts and engages with the safety valve housing 1 to indicate the valve's open position. Spring 4 and spring seat 6 support the steel ball, ensuring effective sealing of the valve when there is no external pressure. The nut and safety valve housing 1 are connected by a threaded connection for easy maintenance and replacement. The safety valve housing contains nut 2, sealing ring 3, spring seat 6, spring 4, and steel ball 5. The safety valve opens and closes by controlling the compression of spring 4 through lubricating oil pressure, which in turn controls the movement of steel ball 5.

[0051] The above description is merely a preferred embodiment of this application and is not intended to limit this application in any way. Although this application has disclosed the preferred embodiment as above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments without departing from the technical solution of this application, based on the technical essence of this application and within the spirit and principles of this application, shall still fall within the protection scope of the technical solution of this application.

Claims

1. A safety valve capable of stable operation in high and low temperature environments, characterized in that: Its components include, The safety valve that can work stably in high and low temperature environments includes a safety movable shell (1), a nut (2), a sealing ring (3), a spring (4), a steel ball (5), a spring seat (6), an oil inlet (7), and an oil outlet (8); The safety movable housing (1) is provided with an oil inlet (7) and an oil outlet (8) respectively. The tail of the safety movable housing (1) is fixedly connected to the nut (2). A sealing ring (3) is provided between the safety movable housing (1) and the nut (2). The nut (2) and the sealing ring (3) prevent lubricating oil from leaking from the non-discharge port. A spring seat (6) is provided at the end of the nut (2) near the steel ball (5). The spring seat (6) is connected to the safety movable housing (1) and the nut (2) respectively. A spring (4) is installed between the spring seat (6) and the steel ball (5). The end of the spring (4) abuts against the surface of the steel ball (5). The steel ball (5) is fitted between the oil inlet (7) and the spring (4) of the safety movable housing (1) with a clearance fit. The safety valve that can work stably in high and low temperature environments pushes the steel ball (5) at the oil inlet (7) by the lubricating oil pressure. The steel ball (5) pushes the spring (4) to compress the spring (4), thereby realizing the opening and closing of the steel ball (5) at the oil inlet (7).

2. The safety valve that can operate stably in high and low temperature environments according to claim 1, characterized in that: The nut (2) has a set of locking holes evenly distributed along the axial direction. The nut (2) has a plug for inserting the spring (4) on the side near the oil inlet (7) of the safety movable housing (1). The plug passes through the spring seat (6) and is set inside the safety movable housing (1).

3. The safety valve that can operate stably in high and low temperature environments according to claim 2, characterized in that: The nut (2) and the sealing ring (3) seal the safety movable housing (1) near the tail side.

4. The safety valve that can operate stably in high and low temperature environments according to claim 2, characterized in that: The spring (4) and spring seat (6) support the steel ball (5), which seals the oil inlet (7) when there is no pressure outside the safety movable housing (1).

5. The safety valve that can operate stably in high and low temperature environments according to claim 4, characterized in that: The spring seat (6) is horizontally fixed inside the safety movable housing (1) by the nut (2) and the steel ball (5), and the spring (4) is compressed by the pressure at the oil inlet (7).

6. The safety valve that can operate stably in high and low temperature environments according to claim 5, characterized in that: The oil inlet (7) of the safety housing (1) is connected to the lubricating oil pump interface.

7. The safety valve that can operate stably in high and low temperature environments according to claim 6, characterized in that: The safety housing (1) has a set of oil outlets (8) symmetrically opened on its shaft diameter. The oil outlets (8) are used for pressure relief and oil return.

8. The safety valve that can operate stably in high and low temperature environments according to claim 3 or 5, characterized in that: The nut (2) is connected to the safety valve housing (1) by a threaded connection, and is used for replacing the nut (2) on the safety valve housing (1).

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