A safety valve for a thin oil lubrication system

Abstract

The present invention provides a safety valve for a thin oil lubrication system, comprising: a valve assembly, the valve assembly comprising a valve body and a pressure relief mechanism. The safety valve for a thin oil lubrication system provided by the present invention has a pressure relief mechanism for blocking a safety pressure relief channel. When the pressure of the medium in the equipment or pipeline in the thin oil lubrication system rises to exceed a specified value, the pressure relief mechanism automatically switches on and discharges the medium to the outside of the thin oil lubrication system through the safety pressure relief channel to prevent the pressure of the medium in the pipeline or equipment from exceeding a specified value, thereby avoiding accidents such as explosions caused by excessive pressure in the equipment or pipeline in the thin oil lubrication system. The valve core adopts a floating structure and is not tightly fitted with the valve body, thereby reducing the fluid resistance of the safety valve under high-viscosity and high-flow media, improving the opening pressure ratio of the safety valve to more than 80%, and optimizing the starting and closing characteristics. At the same time, since the safety valve adopts a floating structure, contamination particles will not cause the valve core to become stuck, and the anti-pollution property is good.

Description

Technical Field

[0001] The invention relates to the field of thin oil lubrication systems, in particular to a safety valve of a thin oil lubrication system. Background Art

[0002] A thin oil lubrication system primarily includes a motor, oil pump, safety valve, filter, diverter, bypass lubrication device, piping, and accessories. When the pressure of the medium within the equipment or piping exceeds a specified value, the safety valve discharges the medium to prevent it from exceeding the specified value. Therefore, safety valves play a crucial role in protecting personnel and equipment operation.

[0003] In existing thin oil lubrication systems, safety valves often utilize direct-acting cartridge valves, commonly used in hydraulic systems. Compared to hydraulic systems, lubrication systems have higher media viscosity, higher system flow rates, and poorer media cleanliness. During system startup at -20°C, the viscosity of lubricating oil reaches over 20,000 Cst, with a flow rate of 600 Lpm. The media also contains metal abrasive particles generated by the gearbox. Hydraulic oil, on the other hand, typically has a viscosity below 64 Cst, a flow rate generally not exceeding 100 Lpm, and a higher cleanliness level after passing through the suction port filter. Therefore, due to the high viscosity and flow rate, existing safety valves in thin oil lubrication systems can cause system pressure to remain excessively high even after the safety valve opens, even exceeding 40% of the set opening pressure. This results in an opening pressure ratio below 60%, resulting in poor opening and closing characteristics. Furthermore, due to poor oil cleanliness, valve core seizure is common. The spool structure of these valves is known to be less resistant to contamination.

[0004] Therefore, a safety valve for a thin oil lubrication system is proposed. Summary of the Invention

[0005] The present invention aims to solve the problems raised in the background technology and provides a safety valve for a thin oil lubrication system.

[0006] The specific technical solutions are as follows:

[0007] A safety valve for a thin oil lubrication system, comprising:

[0008] A valve assembly used in a thin oil lubrication system, the valve assembly comprising a valve body and a pressure relief mechanism, wherein:

[0009] A safety pressure relief channel is provided through the valve body, and the pressure relief mechanism is installed on the valve body. The pressure relief mechanism is used to block the safety pressure relief channel. When the medium pressure in the equipment or pipeline in the thin oil lubrication system rises to exceed the specified value, the pressure relief mechanism automatically opens and discharges the medium to the outside of the thin oil lubrication system through the safety pressure relief channel to prevent the medium pressure in the pipeline or equipment from exceeding the specified value.

[0010] As a preferred solution of the present invention, the pressure relief mechanism includes a long bolt, a self-locking nut, a fixing plate, a valve core, a spring seat and a spring, the long bolt passes through the safety pressure relief channel and is coaxially arranged with the safety pressure relief channel, the long bolt has a smooth non-threaded section, the self-locking nut is threadedly sleeved on the long bolt, and the self-locking nut is located in front of the front end of the safety pressure relief channel, the fixing plate is movably sleeved on the long bolt, and the fixing plate is a hollow plate body, the fixing plate is located between the self-locking nut and the front end of the safety pressure relief channel, the valve core is slidably sleeved on the long bolt, and the valve core is located at the position of the smooth non-threaded section, the inner wall of the valve core is fitted with the side of the long bolt, the spring seat is movably sleeved on the long bolt, and the spring seat is located behind the rear end of the safety pressure relief channel, the spring is sleeved on the long bolt, one end of the spring is against the spring seat, and the other end of the spring is against the valve core.

[0011] As a preferred solution of the present invention, under the action of the spring, one end face of the valve core away from the spring collides with the inner side of the front end of the safety pressure relief channel. At the same time, under the action of the spring, one side face of the fixing plate away from the self-locking nut collides with the outer side of the front end of the safety pressure relief channel.

[0012] As a preferred solution of the present invention, when one end face of the valve core is away from the spring and collides with the inner side of the front end of the safety pressure relief channel, and at the same time, one side face of the fixing plate is away from the self-locking nut and collides with the outer side of the front end of the safety pressure relief channel, the safety pressure relief channel is not conductive; when one end face of the valve core is away from the spring and is separated from the inner side of the front end of the safety pressure relief channel, the safety pressure relief channel is conductive.

[0013] As a preferred solution of the present invention, an annular groove is provided on the inner wall of the valve core, an O-shaped rubber sealing ring is installed in the annular groove, and the inner ring surface of the O-shaped rubber sealing ring is fitted with the side surface of the long bolt.

[0014] As a preferred solution of the present invention, the pressure relief mechanism further includes a limiting sleeve, which is movably mounted on the long bolt and is located on the inner side of the spring and between the valve core and the spring seat.

[0015] As a preferred solution of the present invention, one end of the limiting sleeve away from the valve core is fixedly connected to the spring seat.

[0016] As a preferred solution of the present invention, a limiting groove for accommodating the spring is provided on an end surface of the valve core facing the spring seat.

[0017] As a preferred solution of the present invention, a plurality of fixing bolts are installed through the valve body, and the screw rods of the fixing bolts are arranged toward the fixing plate.

[0018] As a preferred solution of the present invention, a plurality of positioning holes are formed on a side surface of the valve body facing away from the fixing plate.

[0019] The present invention has the following beneficial effects:

[0020] 1. The safety valve for a thin oil lubrication system provided by the present invention mainly comprises a valve body and a pressure relief mechanism. The pressure relief mechanism is provided to block a safety pressure relief passage. When the pressure of the medium in the equipment or pipeline of the thin oil lubrication system rises above a specified value, the pressure relief mechanism automatically opens and discharges the medium through the safety pressure relief passage to the outside of the thin oil lubrication system, thereby preventing the pressure of the medium in the pipeline or equipment from exceeding the specified value. This can avoid accidents such as explosions caused by excessive pressure in the equipment or pipeline of the thin oil lubrication system.

[0021] 2. The valve core of the safety valve of the thin oil lubrication system provided by the present invention adopts a floating structure and is not tightly fitted with the valve body, so that the fluid resistance of the safety valve is reduced under high-viscosity and large-flow media, the opening pressure ratio of the safety valve is increased to more than 80%, and the opening and closing characteristics are optimized. At the same time, since the safety valve adopts a floating structure, contaminants will not cause the valve core to get stuck, and the anti-pollution characteristics are good. The several fixing bolts provided on the safety valve form a flange structure, which can be directly installed in the middle of the discharge pipeline or at the connection of the discharge pipeline without changing the original product structure, which is convenient for on-site installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the structure of the safety valve of the thin oil lubrication system provided by the embodiment of the present invention Figure 1 ;

[0023] Figure 2 Schematic diagram of the structure of the safety valve of the thin oil lubrication system provided by the embodiment of the present invention Figure 2 ;

[0024] Figure 3 Schematic diagram of the structure of the safety valve of the thin oil lubrication system provided by the embodiment of the present invention Figure 3 ;

[0025] Figure 4 Schematic diagram of the structure of the safety valve of the thin oil lubrication system provided by the embodiment of the present invention Figure 4 ;

[0026] Figure 5 For the Figure 4 Schematic diagram of the cross-sectional structure of the AA section;

[0027] Figure 6 It is a schematic diagram of the enlarged structure at view A in 5;

[0028] Figure 7 for Figure 5 Schematic diagram of the three-dimensional structure;

[0029] Figure 8 A simulated diagram of the pressure relief screen of a safety valve of a thin oil lubrication system provided by an embodiment of the present invention;

[0030] Figure 9 A curve diagram showing the relationship between the resistance and flow rate of a safety valve of a thin oil lubrication system provided in an embodiment of the present invention.

[0031] In the attached figure:

[0032] 1. Self-locking nut; 2. Fixing plate; 3. Valve body; 4. Valve core; 5. Spring; 6. Limit sleeve; 7. Long bolt; 8. Spring seat; 9. Safety pressure relief channel; 10. Fixing bolt; 11. Annular groove; 12. O-ring rubber seal. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0034] Among them, the drawings are only used for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting this patent; in order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0035] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inside", "outside" and the like indicate an orientation or position relationship based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0036] In the description of the present invention, unless otherwise expressly specified or limited, when the term "connection" or the like appears to indicate a connection relationship between components, such term should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be internal communication between two components or an interaction between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood in specific circumstances.

[0037] Example

[0038] The safety valve of the thin oil lubrication system provided in this embodiment is as follows: Figures 1-9 As shown, it includes: a valve assembly used in a thin oil lubrication system, the valve assembly includes a valve body 3 and a pressure relief mechanism.

[0039] Among them, a safety pressure relief channel 9 is provided through the valve body 3, and the pressure relief mechanism is installed on the valve body 3, and the pressure relief mechanism is used to block the safety pressure relief channel 9. When the medium pressure in the equipment or pipeline in the thin oil lubrication system rises above the specified value, the pressure relief mechanism automatically conducts and discharges the medium to the outside of the thin oil lubrication system through the safety pressure relief channel 9 to prevent the medium pressure in the pipeline or equipment from exceeding the specified value, thereby avoiding accidents caused by explosions due to excessive pressure in the equipment or pipeline in the thin oil lubrication system.

[0040] Specifically, in this embodiment, the pressure relief mechanism includes a long bolt 7, a self-locking nut 1, a fixing plate 2, a valve core 4, a spring seat 8 and a spring 5. The long bolt 7 is arranged to pass through the safety pressure relief channel 9, and the long bolt 7 is coaxially arranged with the safety pressure relief channel 9. The long bolt 7 has a smooth non-threaded section. The self-locking nut 1 is threadedly sleeved on the long bolt 7, and the self-locking nut 1 is located in front of the front end of the safety pressure relief channel 9. The fixing plate 2 is movably sleeved on the long bolt 7, and the fixing plate 2 is a hollow plate body. The fixing plate 2 is located between the self-locking nut 1 and the front end of the safety pressure relief channel 9. The valve core 4 is slidably sleeved on the long bolt 7, and the valve core 4 is located at the position of the smooth non-threaded section. The inner wall of the valve core 4 is fitted with the side of the long bolt 7. The spring seat 8 is movably sleeved on the long bolt 7, and the spring seat 8 is located behind the rear end of the safety pressure relief channel 9. The spring 5 is sleeved on the long bolt 7, one end of the spring 5 is against the spring seat 8, and the other end of the spring 5 is against the valve core 4.

[0041] Among them, under the action of the spring 5, the end face of the valve core 4 away from the spring 5 conflicts with the inner side of the front end of the safety pressure relief channel 9. At the same time, under the action of the spring 5, the side face of the fixing plate 2 away from the self-locking nut 1 conflicts with the outer side of the front end of the safety pressure relief channel 9.

[0042] Among them, when the end face of the valve core 4 away from the spring 5 conflicts with the inner side of the front end of the safety pressure relief channel 9, and at the same time, the side face of the fixing plate 2 away from the self-locking nut 1 conflicts with the outer side of the front end of the safety pressure relief channel 9, the safety pressure relief channel 9 is not conductive. When the end face of the valve core 4 away from the spring 5 is separated from the inner side of the front end of the safety pressure relief channel 9, the safety pressure relief channel 9 is conductive.

[0043] Among them, the long bolt 7 is a hexagon socket head bolt, which is convenient for adjusting the distance between the spring seat 8 and the fixed plate 2 by turning the long bolt 7 with an hexagon socket wrench. The preload of the spring 5 can be adjusted, and the opening pressure of the safety valve can be changed to adapt to different usage requirements.

[0044] In order to improve the sealing between the valve core 4 and the long bolt 7 and avoid leakage between the valve core 4 and the long bolt 7, an annular groove 11 is opened on the inner wall of the valve core 4, and an O-shaped rubber sealing ring 12 is installed in the annular groove 11. The inner ring surface of the O-shaped rubber sealing ring 12 is fitted with the side surface of the long bolt 7.

[0045] In order to limit the valve core 4 to avoid excessive opening of the valve core 4, the pressure relief mechanism also includes a limiting sleeve 6. The limiting sleeve 6 is movably mounted on the long bolt 7, and the limiting sleeve 6 is located on the inner side of the spring 5. The limiting sleeve 6 is located between the valve core 4 and the spring seat 8. The provided limiting sleeve 6 is used to limit the valve core 4.

[0046] In order to prevent the limiting sleeve 6 from moving around between the valve core 4 and the spring seat 8 , one end of the limiting sleeve 6 away from the valve core 4 is fixedly connected to the spring seat 8 .

[0047] In order to prevent the end of the spring 5 that contacts the valve core 4 from sliding relative to the valve core 4 , a limiting groove for accommodating the spring 5 is provided on one end surface of the valve core 4 facing the spring seat 8 .

[0048] In order to facilitate the installation of the safety valve on equipment or pipelines in the thin oil lubrication system, a plurality of fixing bolts 10 are installed through the valve body 3 , and the screws of the fixing bolts 10 are arranged toward the fixing plate 2 .

[0049] In order to position the safety valve, a plurality of positioning holes 13 are provided on the side of the valve body 3 facing away from the fixing plate 2 .

[0050] In summary, the safety valve of the thin oil lubrication system provided in this embodiment has the following advantages:

[0051] The safety valve of the thin oil lubrication system is mainly composed of a valve body 3 and a pressure relief mechanism. The pressure relief mechanism is used to block the safety pressure relief channel 9. When the medium pressure in the equipment or pipeline in the thin oil lubrication system rises to exceed the specified value, the pressure relief mechanism automatically conducts and discharges the medium to the outside of the thin oil lubrication system through the safety pressure relief channel 9 to prevent the medium pressure in the pipeline or equipment from exceeding the specified value, thereby avoiding accidents such as explosions caused by excessive pressure in the equipment or pipeline in the thin oil lubrication system.

[0052] When in use, the fixing plate 2 of the safety valve is connected to the pressure side of the equipment or pipeline in the thin oil lubrication system, the spring seat 8 is set on the discharge side, and then the fixing bolt 10 is used to fix the safety valve to the pressure side of the equipment or pipeline in the thin oil lubrication system. The preload of the spring 5 can be adjusted by rotating the long bolt 7 to change the opening pressure of the safety valve. When the pressure in the thin oil lubrication system exceeds the preload set by the spring 5, the medium directly acts on the valve core 4 through the hole on the fixing plate 2. After the valve core 4 is opened, the medium is discharged through the annular flow channel formed between the valve core 4 and the safety pressure relief channel 9.

[0053] The safety valve core 4 adopts a floating structure and is not tightly fitted with the valve body 3, which reduces the fluid resistance of the safety valve in high-viscosity and high-flow media. Figure 8 Simulated screen and Figure 9 The experimental data show that the opening pressure ratio of the safety valve is increased to more than 80%, and the opening and closing characteristics are optimized. At the same time, since the safety valve adopts a floating structure, pollution particles will not cause the valve core 4 to get stuck, and the anti-pollution property is good. The several fixing bolts 10 provided in the safety valve form a flange structure, which can be directly installed in the middle of the discharge pipeline or at the connection of the discharge pipeline without changing the original product structure, which is convenient for on-site installation.

[0054] The above are only preferred embodiments of the present invention and do not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A safety valve for a thin oil lubrication system, characterized in that: include: A valve assembly for a thin oil lubrication system, comprising a valve body (3) and a pressure relief mechanism, wherein: The valve body (3) is provided with a safety pressure relief passage (9) running through it. The pressure relief mechanism is installed on the valve body (3) and is used to block the safety pressure relief passage (9). When the pressure of the medium in the equipment or pipeline in the thin oil lubrication system rises to exceed a specified value, the pressure relief mechanism automatically conducts and discharges the medium to the outside of the thin oil lubrication system through the safety pressure relief passage (9) to prevent the pressure of the medium in the pipeline or equipment from exceeding the specified value. The pressure relief mechanism comprises a long bolt (7), a valve core (4), a spring (5), a spring seat (8) and a limiting sleeve (6); the long bolt (7) is arranged to pass through the safety pressure relief channel (9), and the long bolt (7) and the safety pressure relief channel (9) are arranged coaxially, and the long bolt (7) has a smooth non-threaded section; the valve core (4) is slidably sleeved on the long bolt (7), and the valve core (4) is located at the position of the smooth non-threaded section, and there is no tight fit between the valve body (3), and the inner wall of the valve core (4) is fitted with the side of the long bolt (7); the spring seat (8) is movably sleeved on the long bolt (7), and the spring seat (8) is located behind the rear end of the safety pressure relief channel (9), and the spring (5) The spring (5) is sleeved on the long bolt (7), one end of the spring (5) is against the spring seat (8), and the other end of the spring (5) is against the valve core (4); an annular groove (11) is provided on the inner wall of the valve core (4), an O-shaped rubber sealing ring (12) is installed in the annular groove (11), the inner ring surface of the O-shaped rubber sealing ring (12) is arranged to fit the side of the long bolt (7), the limiting sleeve (6) is movably sleeved on the long bolt (7), and the limiting sleeve (6) is located on the inner side of the spring (5), the limiting sleeve (6) is located between the valve core (4) and the spring seat (8), and the end of the limiting sleeve (6) away from the valve core (4) is fixedly connected to the spring seat (8); The pressure relief mechanism further comprises a self-locking nut (1) and a fixing plate (2), wherein the self-locking nut (1) is threadedly sleeved on the long bolt (7), and the self-locking nut (1) is located in front of the front end of the safety pressure relief channel (9), and the fixing plate (2) is movably sleeved on the long bolt (7), and the fixing plate (2) is a hollow plate body, and the fixing plate (2) is located between the self-locking nut (1) and the front end of the safety pressure relief channel (9); Under the action of the spring (5), the end face of the valve core (4) away from the spring (5) comes into contact with the inner side of the front end of the safety pressure relief channel (9), and at the same time, under the action of the spring (5), the side face of the fixing plate (2) away from the self-locking nut (1) comes into contact with the outer side of the front end of the safety pressure relief channel (9); When one end face of the valve core (4) is away from the spring (5) and contacts the inner side of the front end of the safety pressure relief channel (9), and at the same time, one side face of the fixing plate (2) is away from the self-locking nut (1) and contacts the outer side of the front end of the safety pressure relief channel (9), the safety pressure relief channel (9) is not conductive. When one end face of the valve core (4) is away from the spring (5) and is separated from the inner side of the front end of the safety pressure relief channel (9), the safety pressure relief channel (9) is conductive.

2. The safety valve of the thin oil lubrication system according to claim 1, characterized in that: A limiting groove for accommodating the spring (5) is provided on one end surface of the valve core (4) facing the spring seat (8).

3. The safety valve of the thin oil lubrication system according to claim 2, characterized in that: A plurality of fixing bolts (10) are installed through the valve body (3), and the screw rods of the fixing bolts (10) are arranged toward the fixing plate (2).

4. The safety valve of the thin oil lubrication system according to claim 3, characterized in that: A plurality of positioning holes (13) are provided on a side surface of the valve body (3) facing away from the fixing plate (2).

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