An automatic alarm oil mirror structure and a vacuum pump

Abstract

The present invention relates to the technical field of vacuum pumps, and particularly relates to an automatic alarm oil mirror structure and a vacuum pump. The automatic alarm oil mirror structure includes: a base, made of a transparent material, the base includes a receiving groove and two support plates, and a fixing groove is formed at one end of the base opposite to the receiving groove in the height direction, and a magnetic switch is arranged in the fixing groove; a balance bracket, including a swing shaft and a rotating shaft arranged crosswise with the swing shaft; the rotating shaft is hinged to the two support plates; one end of the swing shaft close to the base extends into the receiving groove and forms a floating part; a magnet is arranged in the floating part, and the floating part is adapted to swing up and down in the height direction with the rotating shaft as the axis, and drive the magnet to approach or move away from the magnetic switch in the receiving groove in the height direction, so that the magnetic switch is switched between the on state and the off state. The automatic alarm oil mirror structure provided by the present invention can automatically alarm the liquid level, avoiding the lack of lubricating oil in the equipment caused by manual missed inspection.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum pumps, and particularly relates to an automatic alarm oil mirror structure and a vacuum pump. Background Art

[0002] In mechanical equipment, the lubrication system is extremely important. Most operating equipment requires lubricating oil for lubrication to ensure the normal operation of the equipment. If there is too little lubricating oil, the mechanical equipment cannot be well lubricated, which may lead to serious consequences such as jamming, shaft burning, and shutdown. Therefore, how to ensure sufficient lubricating oil is of crucial importance.

[0003] At present, most vacuum pumps mainly use ordinary oil mirrors. By observing the oil level regularly by hand, it is judged whether the normal operating conditions of the mechanical equipment are met. If it is not discovered in time or missed by manual inspection, the equipment is prone to serious consequences such as jamming, shaft burning, and shutdown due to lack of lubricating oil during operation, seriously affecting the safety of people and equipment.

[0004] The existing vacuum pump oil mirrors can only judge the oil level through manual observation and cannot alarm the liquid level. It is easy to cause lack of lubricating oil in the equipment due to manual missed inspection. Therefore, there is an urgent need for an oil mirror structure that can automatically alarm the liquid level and avoid lack of lubricating oil in the equipment due to manual missed inspection. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the existing vacuum pump oil mirrors in the prior art can only judge the oil level through manual observation, cannot alarm the liquid level, and are prone to lack of lubricating oil in the equipment due to manual missed inspection, so as to provide an automatic alarm oil mirror structure that can automatically alarm the liquid level and avoid lack of lubricating oil in the equipment due to manual missed inspection, and a vacuum pump having the same.

[0006] To solve the above technical problem, the automatic alarm oil mirror structure provided by the present invention includes:

[0007] A base, made of a transparent material, defining two end faces opposite to each other in the thickness direction of the base as a first base face and a second base face respectively. The base is recessed from the first base face towards the direction close to the second base face to form a receiving groove. The base extends from the first base face away from the second base face to form two support plates, and the two support plates are respectively located on both sides in the width direction of the receiving groove. A fixing groove is provided at one end of the base opposite to the receiving groove in the height direction, and a magnetic switch is arranged in the fixing groove.

[0008] A balance bracket, including a swing shaft and a rotating shaft arranged crosswise with the swing shaft; the rotating shaft is hinged to the two support plates; one end of the swing shaft close to the base extends into the receiving groove and forms a floating part.

[0009] The floating part is internally provided with a magnet. The floating part is adapted to swing up and down along the height direction with the rotation axis as the center, and drive the magnet to approach or move away from the magnetic switch along the height direction in the accommodation groove, so that the magnetic switch switches between the on state and the off state.

[0010] Optionally, in the working state, the floating part approaches or moves away from the magnetic switch along the height direction under the action of the buoyancy of the oil;

[0011] When the oil level drops, the floating part approaches the magnetic switch under the action of the buoyancy of the oil. When the oil level is not higher than the critical value of the safe oil level of the equipment, the magnet triggers the magnetic switch under the drive of the floating part, and the magnetic switch switches to the on state;

[0012] When the oil level rises, the floating part moves away from the magnetic switch under the action of the buoyancy of the oil. When the oil level is higher than the critical value of the safe oil level of the equipment, the magnetic switch switches to the off state.

[0013] Optionally, a balance wheel is provided at one end of the swing shaft away from the base, and the balance wheel is adapted to balance the force of the floating part.

[0014] Optionally, an axial limiting part is provided at one end of the swing shaft away from the base, and the axial limiting part is adapted to limit the axial movement of the balance wheel on the swing shaft.

[0015] Optionally, the accommodation groove is an elliptical structure. The major semi-axis P1 of the accommodation groove is arranged along the height direction, and the minor semi-axis Q1 of the accommodation groove is arranged along the width direction; the floating part is an elliptical structure. The major semi-axis P2 of the floating part is arranged along the width direction, and the minor semi-axis Q2 of the floating part is arranged along the height direction. The length of the major semi-axis P2 of the floating part does not exceed the length of the minor semi-axis Q1 of the accommodation groove.

[0016] Optionally, swing limiting parts are respectively protruded at both ends of the floating part along the height direction. The swing limiting parts are adapted to selectively abut against the inner wall of the accommodation groove during the up and down swing of the floating part to limit the floating part in the height direction.

[0017] Optionally, a first sinking groove is formed in the floating part along the height direction, and the first sinking groove is adapted to accommodate the magnet; a second sinking groove corresponding to the first sinking groove is also formed in the floating part, and the second sinking groove is sealed by a plug cover, and the plug cover is adapted to fix the magnet in the first sinking groove.

[0018] Optionally, the magnetic switch includes a mounting connector adapted to be inserted into the fixing groove; the mounting connector is provided with a boss protruding radially, the boss is circumferentially arranged on the outer peripheral wall of the mounting connector, the base is further provided with a groove corresponding to the boss, the groove is circumferentially arranged on the inner peripheral wall of the fixing groove, and the groove is adapted to be snap-fitted with the boss.

[0019] Optionally, the base is further provided with a plum blossom angle mounting structure, which includes a plurality of mounting parts, and the plurality of mounting parts are circumferentially arranged on the outer peripheral wall of the base.

[0020] The present invention further provides a vacuum pump, comprising:

[0021] a vacuum pump body, and the automatic alarm oil mirror structure as described above.

[0022] The technical solution of the present invention has the following advantages:

[0023] 1. For the automatic alarm oil mirror structure provided by the present invention, the base is provided with a receiving groove, so that a gap suitable for the floating part to float up and down in the height direction is formed between the receiving groove and the floating part, so as to facilitate the floating part to float up and down with the change of the oil level height; the base is provided with a support plate, and thus is hinged to the rotating shaft of the balance bracket; the balance bracket is provided with a swing shaft, so that the swing shaft swings up and down in the height direction with the rotating shaft as the axis, thereby driving the magnet to approach or move away from the magnetic switch in the receiving groove in the height direction, so that the magnetic switch switches between the on state and the off state, thereby realizing automatic alarm of the oil level and avoiding lack of lubricating oil in the equipment due to manual omission of inspection.

[0024] 2. For the automatic alarm oil mirror structure provided by the present invention, the receiving groove is an elliptical structure, the major semi-axis P1 of the receiving groove is arranged in the height direction, the minor semi-axis Q1 of the receiving groove is arranged in the width direction, the floating part is an elliptical structure, the major semi-axis P2 of the floating part is arranged in the width direction, the minor semi-axis Q2 of the floating part is arranged in the height direction, and the length of the major semi-axis P2 of the floating part does not exceed the length of the minor semi-axis Q1 of the receiving groove, so as to leave enough space for the floating part to float up and down in the height direction, so that the floating part can float up and down in time with the rise and fall of the oil liquid level.

[0025] 3. The automatic alarm oil mirror structure provided by the present invention, both ends of the floating part protrude to form swing limiting parts along the height direction, so as to selectively abut against the inner wall of the receiving groove during the up and down swing of the floating part, so as to limit the floating part in the height direction and prevent the floating part from being sucked due to complete fitting with the inner wall of the receiving groove; when the floating part tends to the magnetic switch as the liquid level drops, by setting the swing limiting part, after the floating part and the magnetic switch are at the minimum distance in the height direction, it is prevented from being unable to float up as the liquid level rises due to excessive attraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 Isometric structural schematic diagram of the automatic alarm oil mirror structure of the present invention;

[0028] Figure 2 Exploded structural schematic diagram of the automatic alarm oil mirror structure of the present invention;

[0029] Figure 3 Side view structural schematic diagram of the automatic alarm oil mirror structure of the present invention;

[0030] Figure 4 For Figure 3 Cross-sectional structural schematic diagram of section A-A in

[0031] Figure 5 Working principle schematic diagram of the automatic alarm oil mirror structure of the present invention in the on state;

[0032] Figure 6 Working principle schematic diagram of the automatic alarm oil mirror structure of the present invention in the off state;

[0033] Figure 7 Cross-sectional structural schematic diagram of the base of the automatic alarm oil mirror structure of the present invention;

[0034] Figure 8 Isometric structural schematic diagram of the balance bracket of the automatic alarm oil mirror structure of the present invention;

[0035] Figure 9 Front view structural schematic diagram of the magnetic switch of the automatic alarm oil mirror structure of the present invention;

[0036] Figure 10This is a schematic diagram of the dimensions of the accommodation groove of the automatic alarm oil mirror structure of the present invention and the floating part of the balance bracket.

[0037] Description of the reference numerals:

[0038] 10. Base; 101. First base surface; 102. Second base surface; 11. Accommodation groove; 12. Support plate; 13. Fixed groove; 14. Groove; 15. Plum blossom angle mounting structure; 150. Mounting part;

[0039] 20. Magnetic switch; 21. Mounting connector; 210. Boss;

[0040] 30. Balance bracket; 31. Swing shaft; 311. Floating part; 312. Axial limiting part; 313. Swing limiting part; 314. First sink; 315. Second sink; 32. Rotating shaft;

[0041] 40. Magnet;

[0042] 50. Balance wheel;

[0043] 60. Plug cover. Detailed implementation manners

[0044] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0045] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0046] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mount", "connected", "connected" 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 directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0047] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] Embodiment 1

[0049] Combined Figures 1 - 10 As shown, the automatic alarm oil mirror structure provided in this embodiment includes:

[0050] A base 10, made of a transparent material, defining two end faces of the base 10 opposite to each other in the thickness direction as a first base face 101 and a second base face 102 respectively. The base 10 is recessed from the first base face 101 towards the second base face 102 to form a receiving groove 11. The base 10 extends from the first base face 101 away from the second base face 102 to form two support plates 12, and the two support plates 12 are respectively located on both sides of the width direction of the receiving groove 11. A fixing groove 13 is provided at one end of the base 10 opposite to the receiving groove 11 in the height direction, and a magnetic switch 20 is built in the fixing groove 13.

[0051] A balance bracket 30, including a swing shaft 31 and a rotating shaft 32 arranged crosswise with the swing shaft 31. The rotating shaft 32 is hinged to the two support plates 12. One end of the swing shaft 31 close to the base 10 extends into the receiving groove 11 and forms a floating part 311.

[0052] A magnet 40 is built in the floating part 311. The floating part 311 is adapted to swing up and down in the height direction with the rotating shaft 32 as the axis, and drive the magnet 40 to approach or move away from the magnetic switch 20 in the receiving groove 11 in the height direction, so that the magnetic switch 20 switches between an on state and an off state.

[0053] It should be noted that the base 10 is made of a transparent material to facilitate manual observation of the liquid level and quickly determine whether there is a lack of oil. The second base face 102 can be marked with the highest oil level and the lowest oil level to facilitate manual observation of the oil level. The base 10 is made of PPSU polyphenylsulfone material, which can withstand high temperatures of 200 °C, will not produce toxic and harmful substances, has a light weight, good chemical stability, and has the safety and transparency of glass, so as to facilitate manual observation of the oil level. Please refer to Figure 4 As shown, defining two end faces of the base 10 opposite to each other in the thickness direction as a first base face 101 and a second base face 102 respectively. The base 10 is recessed from the first base face 101 towards the second base face 102 to form a receiving groove 11. The receiving groove 11 is adapted to provide a space for the floating part 311 of the balance bracket 30 to float up and down. Please refer to Figure 3As shown, a gap suitable for the floating portion 311 to float up and down is formed between the accommodating groove 11 and the floating portion 311 in the height direction, so that the floating portion 311 can float up and down as the oil level rises and falls.

[0054] It should be noted that the magnetic switch 20 switches between the on state and the off state through the magnetic field of the magnet 40; the magnetic switch 20 can be a reed switch type magnetic switch, and the magnetic switch 20 includes a glass tube and a first reed and a second reed located in the glass tube, and the first reed and the second reed are in a normally open state; when the magnet 40 approaches the magnetic switch 20, the first reed and the second reed are magnetized and attracted to each other under the magnetic field of the magnet 40, and the magnetic switch 20 is switched to the on state at this time; when the magnet 40 is away from the magnetic switch 20, the magnetic field is weakened and almost disappears, and the first reed and the second reed are separated due to their own elasticity, and the magnetic switch 20 is switched to the off state at this time.

[0055] Please note that, see Figure 8 As shown, the balancing bracket 30 includes a swing shaft 31 and a rotating shaft 32 arranged crosswise with the swing shaft 31; see Figure 1 As shown, the rotating shaft 32 is hinged with the two support plates 12; the end of the swing shaft 31 close to the base 10 extends into the receiving groove 11 and forms a floating portion 311; the floating portion 311 is suitable for swinging up and down along the height direction with the rotating shaft 32 as the axis, so as to approach or move away from the magnetic switch 20 along the height direction; see Figure 4 As shown, the floating part 311 has a built-in magnet 40, and the floating part 311 is suitable for swinging up and down in the height direction with the rotating shaft 32 as the axis, and driving the magnet 40 in the receiving groove 11 to approach or move away from the magnetic switch 20 in the height direction, so that the magnetic switch 20 switches between the on state and the off state. The magnetic switch 20 is electrically connected to the PLC controller. When the magnetic switch 20 is in the on state, the PLC controller sends a shutdown signal to the equipment and stops the equipment from running. When the magnetic switch 20 is in the off state, the PLC controller controls the equipment to operate normally.

[0056] In this embodiment, the base 10 is provided with a receiving groove 11, so that a gap suitable for the floating part 311 to float up and down in the height direction is formed between the receiving groove 11 and the floating part 311, facilitating the floating part 311 to float up and down with the height of the oil level; the base 10 is provided with a support plate 12, thereby being hinged to the rotating shaft 32 of the balance bracket 30; the balance bracket 30 is provided with a swing shaft 31, so that the swing shaft 31 swings up and down in the height direction with the rotating shaft 32 as the axis, thereby driving the magnet 40 to approach or move away from the magnetic switch 20 in the receiving groove 11 in the height direction, so that the magnetic switch 20 switches between the on state and the off state, thereby realizing automatic alarm of the oil level and avoiding lack of lubricating oil in the equipment due to manual missed inspection.

[0057] Specifically, in the working state, the floating part 311 approaches or moves away from the magnetic switch 20 in the height direction under the buoyancy of the oil;

[0058] When the oil level drops, the floating part 311 approaches the magnetic switch 20 under the buoyancy of the oil. When the oil level is not higher than the critical value of the safe oil level of the equipment, the magnet 40 triggers the magnetic switch 20 driven by the floating part 311, and the magnetic switch 20 switches to the on state;

[0059] When the oil level rises, the floating part 311 moves away from the magnetic switch 20 under the buoyancy of the oil. When the oil level is higher than the critical value of the safe oil level of the equipment, the magnetic switch 20 switches to the off state.

[0060] It should be noted that the balance bracket 30 is made of PPSU polysulfone material, which can withstand high temperature of 200 °C, will not produce toxic and harmful substances, has good chemical stability, and is light in weight, thus facilitating the buoyancy of the oil on the floating part 311, enabling the floating part 311 to approach or move away from the magnetic switch 20 in the height direction under the buoyancy of the oil.

[0061] It should be noted that in the working state, the floating part 311 approaches or moves away from the magnetic switch 20 in the height direction under the buoyancy of the oil; please refer to Figure 5 As shown, when the oil level drops, the floating part 311 approaches the magnetic switch 20 under the buoyancy of the oil. When the oil level is not higher than the critical value of the safe oil level of the equipment, the magnet 40 triggers the magnetic switch 20 driven by the floating part 311, and the magnetic switch 20 switches to the on state and feeds back the signal of too low oil level to the PLC controller. After receiving the signal of too low oil level, the PLC controller sends a shutdown signal to the equipment and stops the operation of the equipment; please refer to Figure 6As shown, when the oil level rises, the floating part 311 moves away from the magnetic switch 20 under the buoyancy of the oil. When the oil level is higher than the critical value of the safe oil level of the equipment, the magnetic switch 20 switches to the off state. At this time, the oil level is normal, and the PLC controller controls the equipment to operate normally.

[0062] Specifically, a balance wheel 50 is provided at one end of the swing shaft 31 away from the base 10, and the balance wheel 50 is adapted to balance the force of the floating part 311.

[0063] It should be noted that the floating part 311 is not only affected by the buoyancy of the oil, but also by its own gravity and the attraction between the magnetic switch 20 and the magnet 40. By providing a balance wheel 50 at one end of the swing shaft 31 away from the base 10, the force of the floating part 311 is balanced, so as to avoid being unable to float with the rise of the liquid level due to excessive attraction after the minimum distance in the height direction between the floating part 311 and the magnetic switch 20.

[0064] Specifically, an axial limiting part 312 is provided at one end of the swing shaft 31 away from the base 10, and the axial limiting part 312 is adapted to limit the axial movement of the balance wheel 50 on the swing shaft 31.

[0065] It should be noted that the balance wheel 50 is made of 316L stainless steel material to avoid the attachment of magnetized iron pins on the balance wheel 50 and affect the balance; there is a clearance fit between the balance wheel 50 and the swing shaft 31 so that the balance wheel 50 can rotate circumferentially relative to the swing shaft 31; after the balance wheel 50 and the swing shaft 31 are assembled, a hot melt machine is used to melt and press the exposed end face of the swing shaft 31 extending outside the balance wheel 50 to form the axial limiting part 312, thereby effectively preventing the balance wheel 50 from falling off during use.

[0066] Specifically, the receiving groove 11 is an elliptical structure, the major semi-axis P1 of the receiving groove 11 is arranged in the height direction, and the minor semi-axis Q1 of the receiving groove 11 is arranged in the width direction; the floating part 311 is an elliptical structure, the major semi-axis P2 of the floating part 311 is arranged in the width direction, the minor semi-axis Q2 of the floating part 311 is arranged in the height direction, and the length of the major semi-axis P2 of the floating part 311 does not exceed the length of the minor semi-axis Q1 of the receiving groove 11.

[0067] It should be noted that, please refer to Figure 10As shown, the receiving groove 11 is an elliptical structure. The major axis P1 of the receiving groove 11 is arranged in the height direction, and the minor axis Q1 of the receiving groove 11 is arranged in the width direction. The floating part 311 is an elliptical structure. The major axis P2 of the floating part 311 is arranged in the width direction, and the minor axis Q2 of the floating part 311 is arranged in the height direction. The length of the major axis P2 of the floating part 311 does not exceed the length of the minor axis Q1 of the receiving groove 11, so as to leave enough space for the floating part 311 to float up and down in the height direction, enabling the floating part 311 to float up and down in time with the rise and fall of the oil level.

[0068] Specifically, both ends of the floating part 311 in the height direction respectively protrude to form swing limiting parts 313. The swing limiting parts 313 are adapted to selectively abut against the inner wall of the receiving groove 11 during the up and down swing of the floating part 311 to limit the floating part 311 in the height direction.

[0069] Please refer to Figure 8 As shown, in this embodiment, both ends of the floating part 311 in the height direction respectively protrude to form swing limiting parts 313 to selectively abut against the inner wall of the receiving groove 11 during the up and down swing of the floating part 311 to limit the floating part 311 in the height direction and prevent the floating part 311 from being sucked due to complete fitting with the inner wall of the receiving groove 11; when the floating part 311 tends to the magnetic switch 20 as the liquid level drops, by providing the swing limiting parts 313, after the floating part 311 and the magnetic switch 20 are at the minimum distance in the height direction, it can prevent the floating part 311 from being unable to float up with the rise of the liquid level due to excessive attraction.

[0070] Specifically, a first sunk groove 314 is formed in the floating part 311 in the height direction. The first sunk groove 314 is adapted to accommodate the magnet 40; a second sunk groove 315 corresponding to the first sunk groove 314 is also formed in the floating part 311. The second sunk groove 315 is sealed by a plug cover 60, and the plug cover 60 is adapted to fix the magnet 40 in the first sunk groove 314.

[0071] Optionally, the plug cover 60 is made of PTFE (polytetrafluoroethylene) material and has high temperature resistance.

[0072] Please refer to Figure 8As shown, a first sunk groove 314 is formed in the floating part 311 in the height direction. The magnet 40 is adapted to be accommodated in the first sunk groove 314. The floating part 311 is further provided with a second sunk groove 315 corresponding to the first sunk groove 314. The second sunk groove 315 is coaxially arranged with the first sunk groove 314. The second sunk groove is threadedly connected with the plug cover 60, so as to fix the magnet 40 in the first sunk groove 314.

[0073] Specifically, the magnetic switch 20 includes a mounting connector 21, and the mounting connector 21 is adapted to be inserted into the fixing groove 13. A boss 210 protrudes radially from the mounting connector 21. The boss 210 is circumferentially arranged on the outer peripheral wall of the mounting connector 21. The base 10 is further provided with a groove 14 corresponding to the boss 210. The groove 14 is circumferentially arranged on the inner peripheral wall of the fixing groove 13. The groove 14 is adapted to be engaged with the boss 210.

[0074] Optionally, the cross section of the boss 210 is semicircular, the groove 14 is a semicircular structure, and the groove 14 is axially limited to the magnetic switch 20 by being engaged with the boss 210.

[0075] Optionally, the mounting connector 21 is made of PPSU polyphenylsulfone material, and the mounting connector 21 and the body of the magnetic switch 20 are fixedly connected by a sealant.

[0076] Specifically, the base 10 is further provided with a plum blossom angle mounting structure 15. The plum blossom angle mounting structure 15 includes a plurality of mounting parts 150. The plurality of mounting parts 150 are circumferentially arranged on the outer peripheral wall of the base 10.

[0077] Optionally, the base 10 is connected to the outer wall of the fuel tank through the plum blossom angle mounting structure 15, so as to enhance the heat dissipation effect.

[0078] Embodiment Two

[0079] This embodiment provides a vacuum pump, specifically a dry vacuum pump, including:

[0080] A vacuum pump body, and an automatic alarm oil mirror structure as described above.

[0081] Optionally, the automatic alarm oil mirror structure is arranged on the reduction gearbox of the vacuum pump body, and the automatic alarm oil mirror structure is adapted to monitor the oil level in the reduction gearbox.

[0082] Obviously, the above embodiments are merely examples given for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or alterations can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. And the obvious changes or alterations derived therefrom still fall within the protection scope of the present invention.

Claims

1. An automatic alarm oil mirror structure, characterized in that, Comprising: A base (10) made of a transparent material, defining two end faces of the base (10) opposite to each other in the thickness direction as a first base face (101) and a second base face (102) respectively. The base (10) is recessed from the first base face (101) towards the second base face (102) to form a receiving groove (11). The base (10) extends from the first base face (101) away from the second base face (102) to form two support plates (12), and the two support plates (12) are respectively located on both sides of the receiving groove (11) in the width direction. A fixing groove (13) is formed at one end of the base (10) opposite to the receiving groove (11) in the height direction, and a magnetic switch (20) is disposed in the fixing groove (13). A balance bracket (30) comprising a swing shaft (31) and a rotating shaft (32) disposed crosswise to the swing shaft (31). The rotating shaft (32) is hinged to the two support plates (12). One end of the swing shaft (31) close to the base (10) extends into the receiving groove (11) to form a floating portion (311). A balance wheel (50) is disposed at the end of the swing shaft (31) away from the base (10), and the balance wheel (50) is adapted to balance the force of the floating portion (311). A magnet (40) is disposed in the floating portion (311). The floating portion (311) is adapted to swing up and down in the height direction with the rotating shaft (32) as the axis, and drive the magnet (40) to approach or move away from the magnetic switch (20) in the receiving groove (11) in the height direction, so that the magnetic switch (20) switches between an on state and an off state. The receiving groove (11) is an elliptical structure. The major axis P1 of the receiving groove (11) is disposed in the height direction, and the minor axis Q1 of the receiving groove (11) is disposed in the width direction. The floating portion (311) is an elliptical structure. The major axis P2 of the floating portion (311) is disposed in the width direction, and the minor axis Q2 of the floating portion (311) is disposed in the height direction. The length of the major axis P2 of the floating portion (311) does not exceed the length of the minor axis Q1 of the receiving groove (11).

2. The automatic alarm oil mirror structure according to claim 1, characterized in that, In the working state, the floating portion (311) approaches or moves away from the magnetic switch (20) in the height direction under the buoyancy force of the oil. When the oil level drops, the floating portion (311) approaches the magnetic switch (20) under the buoyancy force of the oil. When the oil level is not higher than the critical value of the safe oil level of the equipment, the magnet (40) triggers the magnetic switch (20) under the drive of the floating portion (311), and the magnetic switch (20) switches to the on state. When the oil level rises, the floating portion (311) moves away from the magnetic switch (20) under the buoyancy force of the oil. When the oil level is higher than the critical value of the safe oil level of the equipment, the magnetic switch (20) switches to the off state.

3. The automatic alarm oil mirror structure according to claim 1, characterized in that, One end of the swing shaft (31) far from the base (10) is provided with an axial limiting portion (312), and the axial limiting portion (312) is adapted to limit the axial movement of the balance wheel (50) on the swing shaft (31).

4. The automatic alarm oil mirror structure according to claim 1, characterized in that, Both ends of the floating portion (311) in the height direction respectively protrude to form swing limiting portions (313), and the swing limiting portions (313) are adapted to selectively abut against the inner wall of the receiving groove (11) during the up-and-down swing of the floating portion (311) to limit the floating portion (311) in the height direction.

5. The automatic alarm oil mirror structure according to claim 1, characterized in that, The floating portion (311) is provided with a first sinking groove (314) in the height direction, and the first sinking groove (314) is adapted to accommodate the magnet (40); the floating portion (311) is further provided with a second sinking groove (315) corresponding to the first sinking groove (314), and the second sinking groove (315) is covered by a plug cover (60), and the plug cover (60) is adapted to fix the magnet (40) in the first sinking groove (314).

6. The automatic alarm oil mirror structure according to claim 4, characterized in that, The magnetic switch (20) includes a mounting connector (21), and the mounting connector (21) is adapted to be inserted into the fixing groove (13); a boss (210) is radially protruded from the mounting connector (21), and the boss (210) is circumferentially arranged on the outer peripheral wall of the mounting connector (21), and the base (10) is further provided with a groove (14) corresponding to the boss (210), and the groove (14) is circumferentially arranged on the inner peripheral wall of the fixing groove (13), and the groove (14) is adapted to be engaged with the boss (210).

7. The automatic alarm oil mirror structure according to any one of claims 1-6, characterized in that, The base (10) is further provided with a plum blossom angle mounting structure (15), and the plum blossom angle mounting structure (15) includes a plurality of mounting portions (150), and the plurality of mounting portions (150) are circumferentially arranged on the outer peripheral wall of the base (10).

8. A vacuum pump, characterized in that, Comprising: A vacuum pump body, and an automatic alarm oil mirror structure according to any one of the above claims 1-7.

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