Hydraulic back-blowing fan rotating mechanism suitable for large air volume and high rotating speed

Abstract

The rotating mechanism comprises a lower end cover, an installation body, an upper end cover and a rotating connector, the installation body is located between the lower end cover and the upper end cover and is locked and fixed through a fixing bolt, a hydraulic cylinder is arranged between the upper end cover and the lower end cover, and the rotating connector is connected with the hydraulic cylinder. A connecting rod shaft assembly is rotatably connected to the mounting body, a reset spring is arranged between the hydraulic cylinder and the lower end cover, a rotating body is relatively fixed to the inner side of the upper end cover, and a rotating bearing, a needle bearing and a framework oil seal assembly are arranged in the inner side of the rotating body from top to bottom. The rotating connector penetrates through the rotating bearing, the needle bearing and the framework oil seal assembly and is fixed relative to the rotating bearing and the needle bearing, and the top end of the rotating connector is further connected with an oil pipe. The utility model has the advantages of simple structure, good sealing effect and long service life.

Description

Technical Field

[0001] The utility model relates to the field of agricultural diesel engines, in particular to a hydraulic back-blowing fan rotating mechanism suitable for large air volume and high speed. Background Art

[0002] A hydraulic back-blow fan is a device that relies on pneumatic or hydraulic methods to change the helix angle of the fan blades. This type of fan is mainly used in diesel engines in industries with harsh working environments and a lot of dust and debris, such as agriculture, forestry, mining, construction, garbage disposal, and power generation. It cools the engine water tank in the forward direction and removes debris covering the water tank in the reverse direction, reducing engine energy consumption losses. With the continuous development of the industrial and agricultural fields, the demand for efficient, energy-saving, and environmentally friendly ventilation equipment is increasing. Traditional mechanical reversing fans have disadvantages such as low efficiency, high energy consumption, and high noise, and cannot meet the needs of modern industry and agriculture. Therefore, hydraulic back-blow fans, as a new type of ventilation equipment, have great market potential;

[0003] The two important mechanisms of the hydraulic back-blowing fan are the rotating mechanism and the reversing mechanism. The rotating mechanism is the link and bridge for the transformation of the hydraulic and reversing back-blowing mechanisms. The components of this mechanism on the market are mainly rotating bodies, rotating joints, bearings, copper heads for end face sealing, elastic fixing pins, sealing rings, and support springs. The rotating mechanism of this structure has the following problems:

[0004] 1. The working end surface area of ​​the rotary joint is small, and the roughness, flatness, verticality of the outer circle of the bearing assembly and the working end surface are high, and the processing is difficult;

[0005] 2. The assembly process is complicated, the number of assembled parts is large, and improper assembly can easily damage the sealing hole at the lower end of the copper head, resulting in poor sealing and oil leakage;

[0006] 3. The fan runs at a high speed to obtain a large amount of air for cooling.

[0007] There is no fixed lubrication between the sealing copper heads. Due to the increase in the wind resistance of the fan blades and the end face friction pair, the end face of the sealing copper head wears prematurely, resulting in frequent oil leakage and customer complaints. Utility Model Content

[0008] The technical problem to be solved by the utility model is to provide a rotating mechanism for a hydraulic back-blowing fan with large air volume and high rotation speed, which has a simple structure, good sealing effect and long service life.

[0009] In order to solve the above problems, the utility model adopts the following technical solutions:

[0010] A rotating mechanism for a hydraulic back-blowing fan with large air volume and high speed, comprising a lower end cover, a mounting body, an upper end cover and a rotating joint, wherein the mounting body is located between the lower end cover and the upper end cover and is locked and fixed by fixing bolts, a hydraulic cylinder is built-in between the upper end cover and the lower end cover, a connecting rod shaft assembly is rotatably connected to the mounting body, a return spring is built-in between the hydraulic cylinder and the lower end cover, a rotating body is relatively fixed on the inner side of the upper end cover, a rotating bearing, a needle roller bearing and a skeleton oil seal assembly are built-in on the inner side of the rotating body from top to bottom, the rotating joint passes through the rotating bearing, the needle roller bearing and the skeleton oil seal assembly, and is relatively fixed to the rotating bearing and the needle roller bearing, and an oil pipe is also connected to the top of the rotating joint.

[0011] A further technical solution is that the skeleton oil seal assembly includes a main frame and a sealing rubber and a supporting frame embedded inside the main frame, a tightening spring is also installed on the inside of the sealing rubber, the main frame and the supporting frame are DC material frames, the supporting frame and the sealing rubber embedded inside the main frame form a stable frame, and then a tightening spring is installed to ensure that the oil seal lip does not deform when subjected to hydraulic recoil and high-speed rotation, while improving the sealing performance.

[0012] A further technical solution is that the top of the main frame is provided with upwardly protruding limiting steps distributed along the circumference, so that even if the lower end of the skeleton oil seal assembly is subjected to hydraulic pressure recoil, the skeleton oil seal assembly can be prevented from being flushed out by rotating the bearing limiter.

[0013] A further technical solution is that vertical downward oil outlet holes are distributed in the rotary joint for the circulation of hydraulic oil.

[0014] A further technical solution is that a mounting joint is connected to the top of the rotary joint, the oil pipe and the mounting joint are interconnected, and the top of the rotary joint and the oil pipe are interconnected through the mounting joint.

[0015] A further technical solution is that elastic retaining rings are snapped in between the upper end cover and the rotating body and on the upper and lower sides of the rotating bearing in the rotating body, which are used to limit the rotating body and the rotating bearing in the rotating body.

[0016] The beneficial effects of the utility model are:

[0017] 1. The radial matching method between the outer circle of the rotary joint and the skeleton oil seal assembly is adopted for rotary sealing, which reduces the risk of oil leakage;

[0018] 2. The needle bearing is used to support the bottom of the rotary joint and is positioned at the same time as the front rotary bearing to ensure the smooth operation of the rotary joint under high-speed conditions, solving the problem of joint jumping under high-speed conditions;

[0019] 3. The needle bearing and the bottom end of the rotary joint are used for support, which reduces the impact force of part of the oil pressure through the matching gap between the mounting body and the rotary joint to impact the lip of the skeleton oil seal assembly, thereby increasing the service life of the skeleton oil seal assembly and ensuring the sealing performance.

[0020] 4. We have developed a skeleton oil seal assembly suitable for high pressure, which uses the main skeleton limiter and support skeleton support to perfectly combine with the sealing rubber to improve the pressure resistance and sealing performance of the oil seal itself and ensure reliability under high-speed conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a cross-sectional view of an existing hydraulic back-blowing fan rotating mechanism applicable to large air volume and high speed;

[0023] Figure 2 It is a cross-sectional view of a rotating body in an existing hydraulic back-blowing fan rotating mechanism applicable to large air volume and high speed;

[0024] Figure 3 This is a structural schematic diagram of a rotating mechanism of a hydraulic back-blowing fan suitable for large air volume and high speed in the utility model;

[0025] Figure 4 For this utility model Figure 3 Cross-sectional view in the FF direction;

[0026] Figure 5 This is a cross-sectional view of a rotating body in a rotating mechanism of a hydraulic back-blowing fan suitable for large air volume and high speed according to the utility model;

[0027] Figure 6 This is a cross-sectional view of a skeleton oil seal assembly in a rotating mechanism of a hydraulic back-blowing fan with a large air volume and a high speed according to the utility model;

[0028] Figure 7 The utility model is a schematic diagram of a rotary mechanism of a hydraulic back-blowing fan suitable for large air volume and high speed without a hydraulic cylinder and an upper end cover.

[0029] Figure 1-7In: 1-reset spring, 2-connecting rod shaft assembly, 3-fixing bolt, 4-lower end cover, 5-rotating body, 6-rotating joint, 7-mounting joint, 8-oil pipe, 9-rotating bearing, 10-skeleton oil seal assembly, 11-needle bearing, 12-mounting body, 13-oil outlet hole, 14-locating pin, 15-pad, 16-hydraulic cylinder, 17-upper end cover, 18-elastic retaining ring, 19-connecting rod shaft bearing, 20-mounting hole, 21-connecting rod shaft fixing plate, 22-countersunk screw, 101-limiting step, 102-main frame, 103-sealing rubber, 104-fastening spring, 105-support frame. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0031] See also Figures 1 to 7 As shown, a rotating mechanism of a hydraulic back-blowing fan suitable for large air volume and high speed includes a lower end cover 4, a mounting body 12, an upper end cover 17 and a rotating joint 6. The mounting body 12 is located between the lower end cover 4 and the upper end cover 17 and is locked and fixed by fixing bolts 3. A hydraulic cylinder 16 is built between the upper end cover 17 and the lower end cover 4. A connecting rod shaft assembly 2 is rotatably connected to the mounting body 12. A return spring 1 is built between the hydraulic cylinder 16 and the lower end cover 4. A rotating body 5 is relatively fixed on the inner side of the upper end cover 17. A rotating bearing 9, a needle roller bearing 11 and a skeleton oil seal assembly 10 are built inside the rotating body 5 from top to bottom. The rotating joint 6 penetrates the rotating bearing 9, the needle roller bearing 11 and the skeleton oil seal assembly 10, and is relatively fixed to the rotating bearing 9 and the needle roller bearing 11. An oil pipe 8 is also connected to the top of the rotating joint 6.

[0032] The skeleton oil seal assembly 10 includes a main skeleton 102, a sealing rubber 103 and a supporting skeleton 105 embedded inside the main skeleton 102, a tightening spring 104 is also installed inside the sealing rubber 103, the main skeleton 102 and the supporting skeleton 105 are DC01 material skeletons, the supporting skeleton 105 and the sealing rubber 103 embedded inside the main skeleton 102 form a stable frame, and then the limiting spring 104 is installed to ensure that the oil seal lip does not deform when subjected to hydraulic recoil and high-speed rotation, while improving the sealing performance. The top of the main skeleton 102 is distributed along the circumference with upwardly protruding limiting steps 101, even if the lower end of the skeleton oil seal assembly 10 is subjected to hydraulic recoil, the skeleton oil seal assembly 10 can be limited by the rotating bearing 9 to ensure that it is not flushed out. There are also vertical downward oil outlet holes 13 distributed in the rotary joint 6 for the circulation of hydraulic oil. The top of the rotary joint 6 is connected to a mounting joint 7, and the oil pipe 8 is in communication with the mounting joint 7, so that the top of the rotary joint 6 and the oil pipe 8 are in communication with each other through the mounting joint 7. Elastic retaining rings 18 are also buckled between the upper end cover 17 and the rotary body 5 and on the upper and lower sides of the rotary bearing 9 in the rotary body 5, which are used to limit the position of the rotary body 5 and the position of the rotary bearing 9 in the rotary body 5.

[0033] In this embodiment, if Figure 3 and Figure 7 As shown, the connecting rod shaft assembly 2 is rotatably connected to the mounting body 12 through the connecting rod shaft bearing 19, the connecting rod shaft assembly 2 is located at the outer end of the mounting body 12 and is connected to the external fan blades, and the connecting rod shaft assembly 2 is located at the inner side end of the mounting body 12 and is fixed with a positioning pin 14, and the other end of the positioning pin 14 is fixed with a cushion block 15, and the outer circumferential side of the return spring 1 is also sleeved with a connecting rod shaft fixing plate 21, and the connecting rod shaft fixing plate 21 is also provided with a countersunk screw 22, the countersunk screw 22 penetrates the connecting rod shaft fixing plate 21 and is threadedly connected to the outermost bottom end of the hydraulic cylinder 16, and the cushion block 15 is located between the connecting rod shaft fixing plate 21 and the outermost bottom end of the hydraulic cylinder 16, so the up and down movement of the hydraulic cylinder 16 will drive the cushion block 15 located between the connecting rod shaft fixing plate 21 and the outermost bottom end of the hydraulic cylinder 16 to move up and down; when working, through the external The hydraulic device in the upper part transmits oil pressure through the oil pipe 8 into the rotary joint 6, flows out from the bottom of the oil outlet 13 in the direction of the arrow and pushes the hydraulic cylinder 16 to move downward, and then pushes the hydraulic cylinder 16 and compresses the return spring 1. The hydraulic cylinder 16 moves downward, and during the movement, it drives the cushion block 15 to move. The cushion block 15 drives the connecting rod shaft assembly 2 to start rotating through the locating pin 14, and the fan blades connected to the outside of the connecting rod shaft assembly 2 start to reverse. When the bottom of the hydraulic cylinder 16 contacts the upper end surface of the lower end cover 4, the fan blades together with the connecting rod shaft assembly 2 have rotated into place. At this time, the fan blade reversal is completed and backblowing begins to realize the water tank cleaning work. When the hydraulic pressure is disconnected, the return spring 1 is reset, prompting the hydraulic cylinder 16 to move upward, and re-drive the connecting rod shaft assembly 2 to start rotating, and the fan blades return to the previous initial position to cool the engine water tank.

[0034] Reference Figure 5 As shown, the seal of the utility model is mainly the cooperation of the rotary joint 6 and the skeleton oil seal assembly 10. The radial outer circle seal is generated by the rotary joint 6 rotating to contact the skeleton oil seal assembly 10, which ensures that the oil pressure entering the oil pipe 8 pushes the hydraulic cylinder 16 to move, and by assembling the needle bearing 11, the stability of high-speed operation and the impact of less oil pressure recoil on the skeleton oil seal assembly 10 are ensured, which greatly improves the product life.

[0035] Among them, the rotating body 5 as the core component only needs to add a mounting hole 20 on the inner side of the rotating body 5 to install the rotating bearing 9 and the needle bearing 11. Compared with the original technology, the rotating joint 6 only needs to increase the length, and the size of the skeleton oil seal assembly 10 adopts external cylindrical grinding and polishing technology to meet the roughness requirements.

[0036] The above is only a specific implementation of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included in the protection scope of the present utility model.

Claims

1. A rotating mechanism for a hydraulic back-blowing fan with large air volume and high speed, comprising a lower end cover, a mounting body, an upper end cover and a rotating joint, characterized in that: The mounting body is located between the lower end cover and the upper end cover and is fixed by fixing bolts, a hydraulic cylinder is built-in between the upper end cover and the lower end cover, a connecting rod shaft assembly is rotatably connected to the mounting body, a return spring is built-in between the hydraulic cylinder and the lower end cover, a rotating body is relatively fixed on the inner side of the upper end cover, a rotating bearing, a needle roller bearing and a skeleton oil seal assembly are built-in inside the rotating body from top to bottom, the rotating joint passes through the rotating bearing, needle roller bearing and the skeleton oil seal assembly, and is relatively fixed to the rotating bearing and the needle roller bearing, and an oil pipe is also connected to the top of the rotating joint.

2. According to claim 1, a hydraulic back-blowing fan rotating mechanism suitable for large air volume and high speed, characterized in that: The skeleton oil seal assembly comprises a main skeleton, a sealing rubber embedded inside the main skeleton, and a supporting skeleton, and a fastening spring is also installed inside the sealing rubber.

3. According to claim 2, a hydraulic back-blowing fan rotating mechanism suitable for large air volume and high speed, characterized in that: The top of the main frame is provided with upwardly protruding limiting steps distributed along the circumference.

4. According to claim 1, a hydraulic back-blowing fan rotating mechanism suitable for large air volume and high speed, characterized in that: The rotary joint is also provided with vertical downward oil outlet holes.

5. According to claim 1, a hydraulic back-blowing fan rotating mechanism suitable for large air volume and high speed, characterized in that: The top end of the rotary joint is connected with a mounting joint, and the oil pipe is communicated with the mounting joint.

6. The large air volume and high speed hydraulic back-blowing fan rotating mechanism according to claim 1 is characterized in that: Elastic retaining rings are also buckled between the upper end cover and the rotating body and inside the rotating body at the upper and lower sides of the rotating bearing.

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