Axial end bevel gear supercharging sealing device for high speed gear box

Abstract

A kind of high-speed gear box is with axle end inclined taper gear pressurization sealing device, belong to the non-contact sealing field of gear box, sealing ring seat is provided with the transition cavity and the opposite cavity that are connected through assembly gap around working shaft, the transition cavity is communicated with the outside of high-speed gear box by double-cavity buffer flow channel, double-cavity buffer flow channel is communicated with inclined taper gear pressurization structure, by the high-speed rotation of inclined taper gear pressurization structure, introduce external air and pressurize, then enter the different positions in transition cavity by double-cavity buffer flow channel after rectification, then enter the opposite cavity in assembly gap and collide with the high pressure in high-speed gear box.The present application relies on the pressurization airflow generated by the high-speed rotation of inclined taper gear rotating synchronously with working shaft to collide with the high pressure oil gas inside, realizes sealing, prevents the external leakage of oil gas;Since the inclined taper gear is installed in the sealing ring seat, no additional auxiliary equipment is introduced, and the overall size of the equipment does not change too much, and the difficulty and precision requirement of processing are also lower.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of non-contact sealing of gearboxes, in particular to a shaft end inclined bevel gear pressurization sealing device for high-speed gearboxes. BACKGROUND

[0002] During the operation of a high-speed gearbox, there is a large pressure difference between the inside and outside of the gearbox, and generally a seal is needed to prevent the oil-gas mixture from leaking from the gearbox. However, due to the high pressure of the internal oil-gas mixture, many forms of seals have the possibility of oil-gas leakage.

[0003] In order to solve this problem, the prior art generally introduces external gas into the sealing structure to balance the pressure difference and prevent leakage. However, this method of introducing external gas generally requires the use of additional equipment to increase the pressure of the introduced gas. This not only increases the cost of the seal, but also requires consideration of these additional structures during installation and use, resulting in a larger overall size of the device and higher precision requirements for production and processing. SUMMARY

[0004] In order to solve the problems of cost increase, larger overall size of the device, and higher precision requirements for production and processing caused by the existing method of relying on external auxiliary equipment to introduce external gas to balance the pressure difference inside and outside the high-speed gearbox, the present application provides a shaft end inclined bevel gear pressurization sealing device for high-speed gearboxes. By setting an inclined bevel gear that rotates synchronously with the working shaft in the sealing ring seat, the pressurized airflow generated by the high-speed rotation of the inclined bevel gear is used to counteract the high-pressure oil-gas inside, achieving sealing and preventing oil-gas leakage. Since the inclined bevel gear is installed in the sealing ring seat without introducing additional auxiliary equipment, the overall size of the device does not change much, and the difficulty and precision requirements for processing are lower.

[0005] The technical scheme adopted by the present application to solve the above technical problems is as follows: a shaft end inclined bevel gear pressurization sealing device for high-speed gearboxes, comprising a sealing ring seat arranged on the gearbox and sleeved on the end of the working shaft, the sealing ring seat and the working shaft having an assembly gap therebetween, the sealing ring seat being provided with a transition cavity and a counter-attack cavity surrounding the working shaft and communicating through the assembly gap, wherein the counter-attack cavity communicates with the inside of the high-speed gearbox through the assembly gap, the transition cavity communicates with the outside of the high-speed gearbox through a double-cavity buffer flow channel, and the double-cavity buffer flow channel communicates with an inclined bevel gear pressurization structure. Through the high-speed rotation of the inclined bevel gear pressurization structure, external air is introduced and pressurized, then enters the transition cavity at different positions through the double-cavity buffer flow channel for rectification, and then enters the counter-attack cavity through the assembly gap to counteract the high pressure in the high-speed gearbox.

[0006] As an optimization of the above-mentioned shaft-end bevel gear supercharging sealing device for high-speed gear box, the bevel gear supercharging structure comprises a bevel gear in the sealing ring seat and rotating synchronously with the working shaft, and the small-diameter end of the bevel gear is close to the inner side of the high-speed gear box, and the inclined direction of the bevel gear surface tooth is the same as the rotating direction.

[0007] As another optimization of the above-mentioned shaft-end bevel gear supercharging sealing device for high-speed gear box, the double-cavity buffer flow channel comprises a suction flow channel in communication with the outside, and the outside gas sucked by the suction flow channel is sent to the outer side and inner side of the transition cavity through the outer side annular cavity and the inner side annular cavity respectively, and the rectification is completed in the transition cavity.

[0008] As another optimization of the above-mentioned shaft-end bevel gear supercharging sealing device for high-speed gear box, the suction flow channel is in communication with the outer edge of the suction cavity around the working shaft in the sealing ring seat, and the suction cavity is in communication with the outside through the assembly gap.

[0009] As another optimization of the above-mentioned shaft-end bevel gear supercharging sealing device for high-speed gear box, the outer side annular cavity comprises an arc segment curved towards the working shaft, the two sides of the arc segment extend to the outer side to form a horizontal outlet segment in communication with the outer edge of the transition cavity and an inclined outward expansion segment in communication with the suction flow channel, and the width of the arc segment gradually decreases from the middle to the two sides.

[0010] As another optimization of the above-mentioned shaft-end bevel gear supercharging sealing device for high-speed gear box, the inner side annular cavity comprises a ring shaft segment formed by the outward expansion of the assembly gap and a vertical segment perpendicular to the assembly gap and in communication with the suction flow channel, wherein the width of the ring shaft segment gradually increases along the direction of the incoming outside gas, and the minimum forms a necking region, and the vertical segment is in communication with the necking region through an arc transition region.

[0011] As another optimization of the above-mentioned shaft-end bevel gear supercharging sealing device for high-speed gear box, a gas pressure self-adjusting mechanism is arranged in the sealing ring seat, the gas pressure self-adjusting mechanism comprises a variable diameter hole, the small-diameter end of the variable diameter hole is in communication with the transition cavity through a balance channel, the large-diameter end is in communication with the outside, an elastic blocking mechanism is arranged in the variable diameter hole, the elastic blocking mechanism comprises a blocking small ball supported by a compression spring, and the blocking small ball is tightly pressed in the middle of the variable diameter hole and cuts off the communication between the variable diameter hole and the outside.

[0012] As another optimization of the above-mentioned shaft-end bevel gear supercharging sealing device for high-speed gear box, the variable diameter hole comprises a cylindrical segment I, a variable diameter segment and a cylindrical segment II, wherein the diameter of the cylindrical segment I is smaller than the diameter of the cylindrical segment II, the diameter of the variable diameter segment gradually increases from one end connected to the cylindrical segment I to the other end connected to the cylindrical segment II, and when the compression spring is in the balance state, the blocking small ball is in the middle of the variable diameter segment.

[0013] As another optimization scheme of the above-mentioned shaft end inclined bevel gear supercharging sealing device for high-speed gear box, the free end of the compression spring is fixed on the adjusting screw, and the adjusting screw is threadedly connected with the open end of the variable-diameter hole.

[0014] As another optimization scheme of the above-mentioned shaft end inclined bevel gear supercharging sealing device for high-speed gear box, the sealing ring seat is provided with an oil return groove communicating with the counter-impingement cavity and the inside of the high-speed gear box.

[0015] The present application balances the high-pressure oil gas inside during operation by forming a reverse supercharged air flow through the high-speed rotation of the inclined bevel gear driven by the working shaft, thereby preventing the oil gas from leaking out.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] 1) The present application sets the inclined bevel gear rotating synchronously with the working shaft in the sealing ring seat, relies on the supercharged air flow generated by the high-speed rotation of the inclined bevel gear to counter-impinge the high-pressure oil gas inside, thereby achieving sealing and preventing the oil gas from leaking out.

[0018] 2) In the present application, the supercharged air flow formed by the high-speed rotation of the inclined bevel gear enters the transition cavity through the double-cavity buffer flow channel in two ways, wherein the outer annular cavity, which has a wide middle and narrow sides, can stabilize the inhaled external supercharged air, thereby stably outputting the air flow into the transition cavity; the inner annular cavity increases the radial contraction part on the basis of expanding the assembly gap of the working shaft, which can greatly reduce the influence of external air flow on the high-speed rotation working condition of the working shaft, improve the stability of the working shaft rotation, and reduce the loss of air pressure; the two cavities respectively output the air flow into the transition cavity through different positions, complete preliminary flow regulation, form a stable pressure and flow rate air flow, and then enter the counter-impingement cavity along the assembly gap to counter-impinge the high-pressure oil gas inside and prevent it from leaking out through the assembly gap.

[0019] 3) The sealing ring seat of the application is provided with a gas pressure self-adjusting structure, through which the gas pressure in the transition cavity can be automatically adjusted to keep it within a certain range, preventing the external gas from being pushed into the gear box to cause impact damage to the internal structure of the gear box. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the application;

[0021] Figure 2 is a schematic diagram of the internal structure of the sealing ring seat;

[0022] Figure 3 is a schematic diagram of the structure of the double-cavity buffer flow channel;

[0023] Figure 4 is a schematic diagram of the structure of the gas pressure self-adjusting mechanism and the elastic blocking mechanism;

[0024] Figure 5 is a schematic diagram of the structure of the variable-diameter hole in the gas pressure self-adjusting mechanism;

[0025] Figure 6 is a schematic diagram of the inclined bevel gear supercharging structure;

[0026] Reference signs: 1, sealing ring seat, 101, suction cavity, 102, transition cavity, 103, counter-attack cavity, 104, balance hole, 105, suction flow channel, 2, working shaft, 3, inclined bevel gear supercharging structure, 301, tooth gap of inclined bevel gear, 4, inner annular cavity, 401, vertical section, 402, arc-shaped transition zone, 403, necked-down zone, 404, ring shaft section, 5, outer annular cavity, 501, inclined outward-expanding section, 502, arc-shaped section, 503, horizontal outlet section, 6, gas pressure self-adjusting mechanism, 601, cylindrical section I, 602, variable-diameter section, 603, cylindrical section II, 7, elastic blocking mechanism, 701, blocking ball, 702, compression spring, 703, adjusting screw, 8, inner plug body. DETAILED DESCRIPTION

[0027] The technical solutions of the application will be further described below in combination with specific embodiments. Any part not described in the following embodiments of the application should be understood as existing technology known or should be known by those skilled in the art.

[0028] Example 1

[0029] A kind of high-speed gear box is used to the shaft end inclined bevel gear supercharging sealing device, such as Figure 1 and 2As shown, the sealing ring seat 1 is arranged on the box body and sleeved on the end of the working shaft 2, the sealing ring seat 1 is annular, the outer side is fixedly arranged on the box body, the inner side is sleeved on the end of the working shaft 2, and the inner side of the sealing ring seat 1 and the working shaft 2 have an assembly gap, so as not to affect the high-speed rotation of the working shaft 2; the sealing ring seat 1 is provided with a transition cavity 102 and a butt cavity 103 which surround the working shaft 2 and are communicated through the assembly gap, the transition cavity 102 and the butt cavity 103 are both annular cavities which are arranged on the inner side wall of the sealing ring seat 1, and the butt cavity 103 is closer to the inside of the gear box than the transition cavity 102, wherein the butt cavity 103 is communicated with the inside of the high-speed gear box through the assembly gap, the high-pressure oil gas in the inside can enter the butt cavity 103 through the assembly gap, the transition cavity 102 is communicated with the outside of the high-speed gear box through a double-cavity buffer flow channel, and the double-cavity buffer flow channel is communicated with a bevel gear supercharging structure 3, through the high-speed rotation of the bevel gear supercharging structure 3, the outside air is introduced and pressurized, and then flows into different positions in the transition cavity 102 through the double-cavity buffer flow channel, and then enters the butt cavity 103 through the assembly gap to resist the high pressure in the high-speed gear box; the sealing ring seat 1 is provided with an oil return groove 106 which communicates the butt cavity 103 and the inside of the high-speed gear box.

[0030] In the embodiment, the main body of the bevel gear supercharging structure 3 is a bevel gear, as shown in the figure. Figure 6 The so-called bevel gear means that the length direction of the tooth on the bevel gear is changed from a straight line parallel to the center axis to an inclined direction at a certain angle with the center axis.

[0031] In the embodiment, the supercharging principle of the bevel gear supercharging structure 3 is that, because the gap between the bevel gear and the sealing ring seat is very small, generally 0.1-0.2mm, when the bevel gear rotates at high speed and meets the rotation direction requirement, a pressure difference is formed at the small diameter end and the large diameter end, so that the outside air is continuously sucked in, and the flow rate and pressure of the sucked air are increased.

[0032] The above is the basic embodiment of the application, which can be further improved, optimized and limited on the basis of the above, so as to obtain the following embodiments:

[0033] Embodiment 2

[0034] The main body structure of the embodiment is the same as that of embodiment 1, and the difference lies in the detailed description of the bevel gear supercharging structure 3 on the basis of embodiment 1, wherein the bevel gear supercharging structure 3 includes a bevel gear which is in the sealing ring seat 1 and rotates synchronously with the working shaft 2, as shown in the figure. Figure 6As shown in the figure, and the small diameter end of the bevel gear is close to the inside of the high speed gearbox, the tilt direction of the bevel gear surface tooth is the same as the rotation direction, the so-called same means, from the direction of the small diameter end of the bevel gear to the large diameter end, if the working shaft 2 rotates clockwise, the bevel gear surface tooth is right-handed, if the working shaft 2 rotates counterclockwise, the bevel gear surface tooth is left-handed.

[0035] Embodiment 3

[0036] The main structure of this embodiment is the same as that of embodiment 1, the difference lies in the detailed description of the double-cavity buffer flow channel based on embodiment 1, which includes a suction flow channel 105 communicating with the outside, as shown in the figure. Figure 3 As shown in the figure, and the outside gas sucked by the suction flow channel 105 is sent to the outside and inside of the transition cavity 102 through the outer annular cavity 5 and the inner annular cavity 4 respectively, and the rectification is completed in the transition cavity 102, the so-called outside and inside of the transition cavity 102 means that the transition cavity 102 is an annular cavity, the inside is the position close to the inner ring side wall, and the outside is the position close to the outer ring side wall.

[0037] Embodiment 4

[0038] The main structure of this embodiment is the same as that of embodiment 3, the difference lies in the detailed description of the structure of the suction flow channel 105 based on embodiment 3, as shown in the figure. Figure 2 As shown in the figure, the suction flow channel 105 communicates with the outer edge of the suction cavity 101 arranged around the working shaft 2 in the seal ring seat 1, the suction cavity 101 is an annular cavity, the bevel gear supercharging structure 3 is arranged in the annular cavity, the large diameter end face of the bevel gear supercharging structure 3 forms the suction cavity 101 with the inner wall of the seal ring seat 1, and the suction cavity 101 communicates with the outside through the assembly gap.

[0039] Embodiment 5

[0040] The main structure of this embodiment is the same as that of embodiment 3, the difference lies in the description of the structure of the outer annular cavity 5 based on embodiment 3, as shown in the figure. Figure 3 As shown in the figure, the outer annular cavity 5 includes an arc segment 502 curved towards the working shaft 2, the two sides of the arc segment 502 extend outward to form a horizontal outlet segment 503 communicating with the outer edge of the transition cavity 102, and an inclined outward expansion segment 501 communicating with the suction flow channel 105, and the width of the arc segment 502 gradually decreases from the middle to both sides, that is, the width of the finally formed outer annular cavity 5 is wide in the middle and narrow in the gas inlet and outlet areas on both sides.

[0041] Embodiment 6

[0042] The main structure of this embodiment is the same as that of embodiment 3, the difference lies in the description of the structure of the inner annular cavity 4 based on embodiment 3, as shown in the figure.Figure 3 As shown, the inner annular cavity 4 comprises a ring shaft section 404 formed by expanding the assembly gap and a vertical section 401 perpendicular to the assembly gap and communicating with the suction flow passage 105, wherein the width of the ring shaft section 404 gradually increases along the direction of the incoming external gas, and the minimum forms a necked region 403, and the vertical section 401 communicates with the necked region 403 through an arc-shaped transition region 402.

[0043] In this embodiment, the ring shaft section 404 is formed by expanding the assembly gap of the inner ring of the seal ring seat 1, so that the originally small assembly gap between the seal ring seat 1 and the working shaft 2 becomes large, thereby forming the ring shaft section 404.

[0044] In this embodiment, the small-diameter end face of the bevel gear in the bevel gear supercharging structure 3 is adjacent to the vertical section 401, and there is a gap between the tooth surface of the bevel gear and the inner wall of the seal ring seat 1, which does not affect the rotation of the bevel gear. At this time, the tooth gap 301 between the adjacent two bevel gears on the surface of the bevel gear cooperates with the gap to form the suction flow passage 105, and the cylindrical part end face formed by the large-diameter end of the bevel gear has a gap with the inner wall of the seal ring seat 1, forming the suction cavity 101.

[0045] Embodiment 7

[0046] This embodiment is a detailed description of an embodiment of the double-cavity buffer flow passage, as shown in Figure 2 and 3 As shown, the double-cavity buffer flow passage is formed by the inner plug body 8 arranged around the working shaft 2 cooperating with the inner wall of the seal ring seat 1. The inner plug body 8 is also a ring-shaped structure arranged on the working shaft 2. The outer side surface of the inner plug body 8 and the inner wall surface of the seal ring seat 1 are connected as an integral structure by a plurality of connecting pieces. The connecting pieces are cylindrical rod-shaped pieces, which are small in size and generally 4 to 6 in number, and are uniformly distributed around the working shaft 2. The inner side surface of the inner plug body 8 and the working shaft 2 form the ring shaft section 404 and the necked region 403, and the outer side surface of the inner plug body 8 and the inner wall surface of the seal ring seat 1 cooperate to form the outer annular cavity 5. The end face of the inner plug body 8 away from the butt cavity 103 cooperates with the small-diameter end face of the bevel gear in the bevel gear supercharging structure 3 to form the vertical section 401.

[0047] Embodiment 8

[0048] This embodiment is an improved scheme based on Embodiment 1, and the main structure is the same as Embodiment 1. The improvement lies in that a gas pressure self-adjusting mechanism 6 is arranged in the seal ring seat 1, as shown in Figure 4 and 5As shown, the air pressure self-adjusting mechanism 6 comprises a variable diameter hole, which is generally horizontal, the small diameter end of the variable diameter hole is communicated with the transition cavity 102 through a balance hole 104, the large diameter end is communicated with the outside, and an elastic blocking mechanism 7 is arranged in the variable diameter hole, the elastic blocking mechanism 7 comprises a blocking ball 701 supported by a compression spring 702, and the blocking ball 701 is tightly pressed in the middle of the variable diameter hole and cuts off the communication between the variable diameter hole and the outside; when the air pressure in the transition cavity 102 is too large, the blocking ball 701 can be pushed to move outward to overcome the elastic force of the compression spring 702, so as to buffer and adjust the air pressure in the transition cavity 102.

[0049] Embodiment 9

[0050] The main structure of this embodiment is the same as that of embodiment 7, the difference lies in that the structure of the variable diameter hole is described on the basis of embodiment 7, as shown in Figure 5 As shown, the variable diameter hole comprises a cylindrical section I 601, a variable diameter section 602 and a cylindrical section II 603, wherein the cylindrical section I 601 and the cylindrical section II 603 are cylindrical holes, the variable diameter section 602 is a conical hole with one end large in diameter and the other end small in diameter, the diameter of the cylindrical section I 601 is smaller than that of the cylindrical section II 603, the diameter of the variable diameter section 602 gradually increases from the end connected with the cylindrical section I 601 to the end connected with the cylindrical section II 603, and the blocking ball 701 is in the middle of the variable diameter section 602 when the compression spring 702 is in the balanced state; the free end of the compression spring 702 is fixed on an adjusting screw 703, and the adjusting screw 703 is screwed with the opening end of the variable diameter hole, and by screwing the adjusting screw 703, the pre-tightening force of the compression spring 702 can be adjusted to meet the different rotating speed conditions of the working shaft 2.

Claims

1. A shaft-end helical bevel gear pressure-increasing sealing device for a high-speed gearbox, comprising a sealing ring seat (1) disposed on the gearbox body and sleeved on the end of a working shaft (2), wherein the sealing ring seat (1) and the working shaft (2) have an assembly gap, characterized in that: The sealing ring seat (1) is provided with a transition cavity (102) and a counter-impact cavity (103) that surround the working shaft (2) and are connected through an assembly gap. The counter-impact cavity (103) is connected to the inside of the high-speed gearbox through the assembly gap. The transition cavity (102) is connected to the outside of the high-speed gearbox through a double-cavity buffer channel. The double-cavity buffer channel is connected to a bevel gear booster structure (3). Through the high-speed rotation of the bevel gear booster structure (3), external air is introduced and boosted. After being rectified, it enters different positions in the transition cavity (102) through the double-cavity buffer channel and then enters the counter-impact cavity (103) through the assembly gap to impact the high pressure in the high-speed gearbox. The dual-cavity buffer channel includes an intake channel (105) connected to the outside, and the external gas intake through the intake channel (105) is sent to the outside and inside of the transition cavity (102) through the outer annular cavity (5) and the inner annular cavity (4), respectively, and the rectification is completed in the transition cavity (102). The outer annular cavity (5) includes an arc-shaped segment (502) that bends toward the working shaft (2). The two sides of the arc-shaped segment (502) extend outward to form a horizontal outlet segment (503) that communicates with the outer edge of the transition cavity (102) and an inclined outward expansion segment (501) that communicates with the suction channel (105). The width of the arc-shaped segment (502) gradually decreases from the middle to both sides.

2. The shaft end helical bevel gear pressure-increasing sealing device for a high-speed gearbox according to claim 1, characterized in that: The inclined bevel gear booster structure (3) includes an inclined bevel gear located inside the sealing ring seat (1) and rotating synchronously with the working shaft (2), and the small diameter end of the inclined bevel gear is close to the inner side of the high-speed gearbox. The inclination direction of the surface teeth of the inclined bevel gear is the same as the rotation direction.

3. The shaft end helical bevel gear pressure-increasing sealing device for a high-speed gearbox according to claim 1, characterized in that: The suction channel (105) is connected to the outer edge of the suction chamber (101) arranged around the working shaft (2) inside the sealing ring seat (1), and the suction chamber (101) is connected to the outside through the assembly gap.

4. The shaft end helical bevel gear pressure-increasing sealing device for a high-speed gearbox according to claim 1, characterized in that: The inner annular cavity (4) includes an annular shaft section (404) formed by expanding the assembly gap and a vertical section (401) perpendicular to the assembly gap and connected to the suction flow channel (105). The width of the annular shaft section (404) gradually increases along the direction of external gas entry, and a necking region (403) is formed at the minimum point. The vertical section (401) is connected to the necking region (403) through an arc-shaped transition region (402).

5. The shaft end helical bevel gear pressure-increasing sealing device for a high-speed gearbox according to claim 1, characterized in that: The sealing ring seat (1) is provided with a pressure self-regulating mechanism (6). The pressure self-regulating mechanism (6) includes a variable diameter hole. The small diameter end of the variable diameter hole is connected to the transition cavity (102) through a balance channel (104), and the large diameter end is connected to the outside. An elastic blocking mechanism (7) is provided in the variable diameter hole. The elastic blocking mechanism (7) includes a blocking ball (701) supported by a compression spring (702). The blocking ball (701) is pressed against the middle of the variable diameter hole and cuts off the connection between the variable diameter hole and the outside.

6. The shaft end helical bevel gear pressure-increasing sealing device for a high-speed gearbox according to claim 5, characterized in that: The variable diameter hole includes cylindrical section I (601), variable diameter section (602) and cylindrical section II (603), wherein the diameter of cylindrical section I (601) is smaller than the diameter of cylindrical section II (603), and the diameter of variable diameter section (602) gradually increases from the end connected to cylindrical section I (601) to the end connected to cylindrical section II (603). When the compression spring (702) is in equilibrium, the blocking ball (701) is located in the middle of the variable diameter section (602).

7. The shaft end helical bevel gear pressure-increasing sealing device for a high-speed gearbox according to claim 5, characterized in that: The free end of the compression spring (702) is fixed on the adjusting screw (703), and the adjusting screw (703) is threadedly connected to the open end of the variable diameter hole.

8. The shaft end helical bevel gear pressure-increasing sealing device for a high-speed gearbox according to claim 1, characterized in that: The sealing ring seat (1) is provided with an oil return groove (106) that connects the anti-flush chamber (103) and the inside of the high-speed gearbox.

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