A transmission shaft structure with backstop function

Abstract

The present invention discloses a transmission shaft structure with a non-return function, which relates to the technical field of transmission shaft structures, including a bevel gear, a middle shaft, a bearing assembly and a one-way clutch, wherein a bevel gear is arranged at one end of the middle shaft, and the other end is connected to a motor through a transmission shaft, and a bearing assembly and a one-way clutch are arranged on the middle shaft in sequence, the bevel gear is used to mesh with a gear in a reducer, and a bearing assembly is arranged between the reducer and the middle shaft, and the one-way clutch can prevent the middle shaft from reversing. The one-way clutch with a non-return function on the middle shaft of the present invention adds a non-return function to the input end of the cooling tower fan reducer, thereby ensuring that the fan will not reversely rotate when it is stopped, thereby achieving the purpose of protecting equipment and ensuring the safety of maintenance personnel.

Description

Technical Field

[0001] The invention relates to the technical field of transmission shaft structures, and in particular to a transmission shaft structure with a non-return function. Background Art

[0002] Industrial cooling tower is a kind of equipment which utilizes the contact between water and air to dissipate the waste heat generated in industry or refrigeration and air conditioning through evaporation. It adopts the operation mode of ordinary motor-drive shaft-reducer-drive fan. Its drive is the structure that the motor drives the gear reducer through the drive shaft and then drives the fan.

[0003] When the fan of an industrial cooling tower is shut down for maintenance, the reverse action of the hot and humid steam in the tower causes the fan to rotate in the opposite direction, which poses a great safety hazard to the maintenance personnel. At the same time, the reverse rotation will also cause varying degrees of damage to the transmission shaft, reducer gears, bearings and other equipment. Therefore, a transmission shaft structure with a backstop function is urgently needed to prevent the fan from rotating in the opposite direction. Summary of the invention

[0004] The object of the present invention is to provide a transmission shaft structure with a non-return function to solve the problems existing in the above-mentioned prior art, so that the fan cannot rotate in the reverse direction, thereby improving the safety of the fan when it is shut down for maintenance.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a transmission shaft structure with a reverse stop function, comprising a bevel gear, a middle shaft, a bearing assembly and a one-way clutch, wherein one end of the middle shaft is provided with the bevel gear, and the other end is connected to a motor through a transmission shaft, the bearing assembly and the one-way clutch are sequentially arranged on the middle shaft, the bevel gear is used to mesh with a gear in a reducer, the bearing assembly is arranged between the reducer and the middle shaft, and the one-way clutch can prevent the middle shaft from reversing.

[0007] Preferably, the bearing assembly includes a bearing support and a bearing, a plurality of stepped shafts are arranged on the central axis, and a bearing is respectively arranged on the spaced shaft sections of the central axis, and the bearing support is sleeved on the central axis and has a bearing clamped at both ends.

[0008] Preferably, an oil-slinging pan is provided between the large end surface of the bevel gear and the bearing at the inner end, and a plurality of notches are evenly distributed on the edge of the oil-slinging pan.

[0009] Preferably, a positioning nut is connected to the shaft section outside the bearing at the outer end, and a stop washer is arranged between the positioning nut and the inner ring of the bearing at the outer end.

[0010] Preferably, the bearing is a tapered roller bearing.

[0011] Preferably, the outer sleeve of the one-way clutch is provided with a sealing sleeve, one end of the sealing sleeve is plugged into the outer end of the bearing support and connected by bolts, and the other end is connected to the one-way clutch and the sealing end cover in sequence by bolts.

[0012] Preferably, an O-ring is provided between the sealing sleeve and the bearing support, and a lip-type sealing ring and a retaining ring are provided between the sealing sleeve and the central shaft.

[0013] Preferably, a lip-shaped sealing ring is provided between the sealing end cover and the central shaft, and a straight-through pressure-injection oil cup is provided on the sealing end cover.

[0014] Preferably, the one-way clutch is a wedge-type one-way clutch.

[0015] Preferably, the wedge-type one-way clutch includes an inner ring, an outer ring, a wedge and a retaining frame, the inner ring is connected to the central shaft via a key, the outer ring is connected to the sealing sleeve of the bearing assembly, the retaining frame and the outer ring are sequentially sleeved on the outer side of the inner ring, the wedge is hinged on the retaining frame via a pin, the wedge is small on the outside and large on the inside, a torsion spring is provided on the wedge, the torsion spring is sleeved on the pin, and the torsion spring can reset the wedge.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] The one-way clutch with a check function on the central shaft of the present invention enables the cooling tower fan reducer to add a check function at the input end, ensuring that the fan will not rotate in the reverse direction when in a stopped state, thereby achieving the purpose of protecting equipment and ensuring the safety of maintenance personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of a transmission shaft structure with a non-return function in an embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of the assembly structure of the transmission shaft structure with a non-return function in an embodiment of the present invention;

[0021] Figure 3 It is a schematic diagram of the appearance structure of a transmission shaft structure with a non-return function in an embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the internal structure of a transmission shaft structure with a non-return function in an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the central axis in an embodiment of the present invention;

[0024] Figure 6 A schematic diagram of the structure of a bearing support in an embodiment of the present invention;

[0025] Figure 7 It is a schematic diagram of the structure of the sealing sleeve in an embodiment of the present invention;

[0026] Figure 8 It is a structural schematic diagram of the oil-slinging pan in an embodiment of the present invention;

[0027] Fig. 9 It is a schematic diagram of the overall structure of a one-way clutch in an embodiment of the present invention;

[0028] Fig.10 A schematic cross-sectional structure diagram of a one-way clutch in an embodiment of the present invention;

[0029] Fig.11 It is a schematic diagram of the end surface structure of the one-way clutch in an embodiment of the present invention;

[0030] Fig.12 For the embodiment of the present invention Fig.10 Schematic diagram of the local structure of AA Figure 1 ;

[0031] Fig.13 For the embodiment of the present invention Fig.10 Schematic diagram of the local structure of AA Figure 2 ;

[0032] In the figure: 1-bevel gear, 2-cylindrical pin, 3-oil-slinging plate, 4-central shaft, 5-bearing support, 6-tapered roller bearing, 7-sealing ring, 8-sealing sleeve, 9-bolt, 10-spring washer, 11-one-way clutch, 12-locating nut, 13-stop washer, 14-straight-through pressure-injected oil cup, 15-double round head flat key, 16-single round head flat key, 17-lip seal, 18-elastic retaining ring, 19-sealing end cover, 20-cage, 21-inner ring, 22-outer ring, 23-wedge, 24-torsion spring. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The purpose of the present invention is to provide a transmission shaft structure with a non-return function to solve the problems existing in the prior art, so that the fan cannot rotate in the reverse direction and the safety of the fan is improved when it is shut down for maintenance.

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Embodiment 1

[0037] like Figures 1 to 13 As shown, in this embodiment, a transmission shaft structure with a non-return function is provided, including a bevel gear 1, a middle shaft 4, a bearing assembly and a one-way clutch 11. One end of the middle shaft 4 is provided with a bevel gear 1, and the other end is connected to the motor through a transmission shaft. The middle shaft 4 is provided with a bearing assembly and a one-way clutch 11 in sequence. The bevel gear 1 is used to mesh with the gear in the reducer. A bearing assembly is provided between the reducer and the middle shaft 4. The one-way clutch 11 can prevent the middle shaft 4 from reversing.

[0038] As an optional solution, the bearing assembly in this embodiment includes a bearing support 5 and a bearing. A plurality of stepped shafts are arranged on the central axis 4, and a bearing is respectively arranged on the spaced shaft sections of the central axis 4. The bearing support 5 is sleeved on the central axis 4 and a bearing is respectively clamped at both ends, which plays a role in fixing and positioning the bearing installation.

[0039] As an optional solution, in this embodiment, an oil-slinging plate 3 is arranged between the large end face of the bevel gear 1 and the inner end bearing (connected by a cylindrical pin 2), and the edge of the oil-slinging plate 3 is evenly distributed with a number of notches. The bevel gear 1 drives the oil-slinging plate 3 to rotate together. Under the action of centrifugal force, the oil-slinging plate 3 throws the gear oil in the reducer housing into the oil groove at the top of the housing, and flows to the upper bearing through the oil path, so as to achieve the purpose of lubricating the bearing. Among them, the cylindrical pin 2 between the oil-slinging plate 3 and the central shaft 4 is used to clamp the oil-slinging plate 3, and the single round head flat key 16 is used to connect the transmission shaft between the motor and the reducer.

[0040] As an optional solution, in this embodiment, a positioning nut 12 is connected to the shaft section outside the bearing at the outer end, and a locking washer 13 is provided between the positioning nut 12 and the inner ring of the bearing at the outer end to prevent the positioning nut 12 from loosening due to vibration or friction. Among them, a keyway is provided on the central shaft 4 at the positioning nut 12, and the keyway is used to engage with the card on the locking washer 13. After being locked, the locking washer 13 cannot move relative to the shaft, thereby playing the role of locking itself and the nut.

[0041] As an optional solution, in this embodiment, the shaft 4 is supported by a tapered roller bearing 6, which can withstand relatively large radial and axial forces.

[0042] As an optional solution, in this embodiment, a sealing sleeve 8 is provided on the outside of the one-way clutch 11. One end of the sealing sleeve 8 is connected to the outer end of the bearing support 5 through a bolt 9 after being plugged in, and the other end is connected to the one-way clutch 11 and the sealing end cover 19 in sequence through the bolt 9. A lip seal 17 and an elastic retaining ring 18 are provided between the sealing end cover 19 and the one-way clutch 11, and a lip seal 17 is provided between the sealing end cover 19 and the central shaft 4. The sealing sleeve 8 can be connected and fixed to the outer ring 22 of the one-way clutch 11 on the reducer through the bolt 9. Among them, a spring washer 10 is provided on the bolt 9.

[0043] As an optional solution, in this embodiment, an O-ring 7 is provided between the sealing sleeve 8 and the bearing support 5, and a lip-shaped sealing ring 17 and an elastic retaining ring 18 are provided between the sealing sleeve 8 and the central shaft 4. The sealing ring 7 and the lip-shaped sealing ring 17 are installed on the sealing sleeve 8 to seal the lubricating oil in the reducer. Among them, the lip-shaped sealing ring 17 can also be replaced by an oil or dust seal. In this embodiment, the two inner lip-shaped sealing rings 17 are used to seal the lubricating oil in the reducer from leaking out, and the outer lip-shaped sealing ring 17 is used to prevent external dust from entering the reducer.

[0044] As an optional solution, in this embodiment, a lip-type sealing ring 17 is arranged between the sealing end cover 19 and the central shaft 4 to play a sealing role. A straight-through pressure injection oil cup 14 is arranged on the sealing end cover 19, and a gasket is arranged between the straight-through pressure injection oil cup 14 and the oil hole of the sealing end cover 19.

[0045] As an optional solution, the one-way clutch 11 in this embodiment is a wedge-type one-way clutch.

[0046] As an optional solution, the wedge 23 type one-way clutch 11 in this embodiment includes an inner ring 21, an outer ring 22, a wedge 23 and a retainer 20. The inner ring 21 is connected to the central shaft 4 through a double round head flat key 15, and the outer ring 22 is connected to the sealing sleeve 8 of the bearing assembly. The inner ring 21 is sleeved with the retainer 20 and the outer ring 22 in sequence. The retainer 20 is hinged with a wedge 23 through a pin shaft. The wedge 23 is small outside and large inside. A torsion spring 24 is provided on the wedge 23. The torsion spring 24 is sleeved on the pin shaft. The torsion spring 24 can reset the wedge 23. The torsion spring 24 is located on one side of the forward rotation direction of the wedge 23. Among them, the wedge 23 type one-way clutch 11 can also adopt other conventional structures in the art. The wedge 23 is hinged on the retainer 20, and the torsion spring 24 is connected to the middle rotating shaft of the wedge 23.

[0047] The working principle of the wedge-type one-way clutch to prevent reverse rotation in this embodiment is as follows: when the fan is operating normally, the motor drives the gear in the reducer through the transmission shaft to transmit, and drives the fan impeller to rotate through the output shaft. At this time, the wedge 23 installed on the one-way clutch 11 in this embodiment overcomes the elastic force of the torsion spring 24 under the action of centrifugal force and disengages from the outer ring 22, breaking away from the restraint of the outer ring 22, so that the inner ring 21 and the central axis 4 rotate normally together; when the machine is stopped, after the wedge 23 loses the centrifugal force, it returns to its original position under the action of the torsion spring 24 and contacts the outer ring 22, while the outer ring 22 is fixed to the bearing support 5 by bolts 9 and cannot rotate, so that the wedge 23 clamps the inner and outer rings 22 and forms a whole, so that the bevel gear 1 cannot rotate, thereby achieving the purpose of reverse braking.

[0048] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A transmission shaft structure with a backstop function, characterized in that: It includes a bevel gear, a central shaft, a bearing assembly and a one-way clutch. The bevel gear is arranged at one end of the central shaft, and the other end is connected to the motor through a transmission shaft. The bearing assembly and the one-way clutch are arranged on the central shaft in sequence. The bevel gear is used to mesh with the gear in the reducer. The bearing assembly is arranged between the reducer and the central shaft. The one-way clutch can prevent the central shaft from reversing.

2. The transmission shaft structure with a non-return function according to claim 1, characterized in that: The bearing assembly includes a bearing support and a bearing. A plurality of stepped shafts are arranged on the central shaft. A bearing is arranged on each of the spaced shaft sections of the central shaft. The bearing support is sleeved on the central shaft and has a bearing clamped at both ends.

3. The transmission shaft structure with a non-return function according to claim 2, characterized in that: An oil-slinging pan is arranged between the large end surface of the bevel gear and the bearing at the inner end, and a plurality of notches are evenly distributed on the edge of the oil-slinging pan.

4. The transmission shaft structure with a non-return function according to claim 2, characterized in that: A positioning nut is connected to the shaft section outside the bearing at the outer end, and a stop washer is arranged between the positioning nut and the inner ring of the bearing at the outer end.

5. The transmission shaft structure with a non-return function according to claim 2, characterized in that: The bearing is a tapered roller bearing.

6. The transmission shaft structure with a non-return function according to claim 2, characterized in that: The outer sleeve of the one-way clutch is provided with a sealing sleeve, one end of the sealing sleeve is plugged with the outer end of the bearing support and connected by bolts, and the other end is connected to the one-way clutch and the sealing end cover in sequence by bolts.

7. The transmission shaft structure with a non-return function according to claim 6, characterized in that: An O-type sealing ring is arranged between the sealing sleeve and the bearing support, and a lip-shaped sealing ring and a retaining ring are arranged between the sealing sleeve and the central shaft.

8. The transmission shaft structure with a non-return function according to claim 6, characterized in that: A lip-shaped sealing ring is arranged between the sealing end cover and the central shaft, and a straight-through pressure-injection oil cup is arranged on the sealing end cover.

9. The transmission shaft structure with a non-return function according to claim 1, characterized in that: The one-way clutch is a wedge-type one-way clutch.

10. The transmission shaft structure with a non-return function according to claim 9, characterized in that: The wedge-type one-way clutch includes an inner ring, an outer ring, a wedge and a retaining frame. The inner ring is connected to the central shaft via a key, the outer ring is connected to the sealing sleeve of the bearing assembly, the retaining frame and the outer ring are sequentially sleeved on the outer side of the inner ring, the retaining frame is hinged with the wedge via a pin shaft, the wedge block is small on the outside and large on the inside, a torsion spring is arranged on the wedge block, the torsion spring is sleeved on the pin shaft, and the torsion spring can reset the wedge block.

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