Reversing fan and reversing fan shell assembly

Abstract

The utility model discloses a reversing fan and a shell assembly. The problems that in the prior art, due to the fact that a shell is too many in component parts, the structure is complex, and disassembly and assembly difficulty is large are solved. A shell of the reversing fan comprises a front shell body and a rear shell body, the matching face of the front shell body and the rear shell body is thicker than the wall thickness of the shell body, semi-arc through grooves matched with each other are formed in the matching face of the front shell body and the rear shell body respectively, and after the front shell body and the rear shell body are matched in a butt joint mode, the two semi-arc through grooves are folded to form N shaft holes formed at equal intervals along the circumference. A fan blade shaft is installed at the position of the shaft hole through a thrust bearing and a shaft sleeve, the inner side of the fan blade shaft is connected with a piston through a pin shaft, and the outer side of the fan blade shaft is fixedly connected with fan blades. The technology can be suitable for a pneumatic reversing fan or a hydraulic reversing fan, and the three-section combined design of the annular fan shell is changed into the two-section design of the front shell and the rear shell, so that the part composition number of the shell is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of reversing fans for engine cooling fans. Background Art

[0002] At present, when traditional agricultural harvesters are working, after the stems and leaves of the crops to be harvested are cut off, they are easily sucked into the engine compartment by the engine cooling fan. If not cleaned in time, there is a risk of spontaneous combustion of the equipment. The current method is to use a reversing fan to change the direction of the fan. When changing the direction, it is necessary to wait for the fan blades to stop rotating before changing the rotation direction of the fan. Generally, the fan blades have a large diameter and a high rotation speed, and the stopping time of the fan is long. It is necessary to continuously stop and switch the rotation direction of the fan, which is a waste of time.

[0003] In existing reversing fans, the housing that makes up the main body of the fan is generally manufactured by an aluminum alloy die-casting process. Structurally, the housing is composed of three parts, namely a front housing, a rear housing, and a transition piece - an annular body installed between the front housing and the rear housing. Among them, the middle annular body is used to install the fan blade shaft assembly. A plurality of mounting shaft holes arranged circumferentially are provided on the annular body. By installing the mounting shaft of the fan blade shaft assembly at the mounting shaft holes, the reversing control of the fan blade shaft assembly is realized through an internal hydraulic or pneumatic control structure.

[0004] In any case, in the current technical situation in the field, the housing is composed of three parts: a front housing, a rear housing, and an annular body, and no other designs are seen.

[0005] The above-mentioned housing structure can refer to the following technical documents: WO2011 / 072381A1, CN211820036U show that in the technical field, the housing is composed of three parts: a front housing, a rear housing, and an annular body. The applicant also used this three-section design before, specifically refer to CN 220849829 U, and will not list them one by one.

[0006] The three-section design (front housing, rear housing, and annular body) has its advantages, such as simple structure and being conducive to reducing manufacturing costs. However, the three-section design also has its disadvantages, such as requiring higher assembly skills and being more cumbersome for the disassembly and assembly of the whole machine during later maintenance and repair. Summary of the Utility Model

[0007] In order to solve the deficiencies of the prior art, the utility model provides a reversing fan, a housing, and their combined structure, and solves the problems of complex structure and difficult disassembly and assembly caused by too many components of the housing in the prior art.

[0008] The technical solution adopted by the utility model to solve its technical problems is as follows:

[0009] A reversing fan, characterized in that the shell of the reversing fan includes a front shell and a rear shell, the mating surfaces of the front shell and the rear shell have a thickness thicker than the shell wall thickness, and semi-circular arc grooves that match each other are respectively arranged at the mating surfaces of the front shell and the rear shell. After the front shell and the rear shell are butt-fitted, the two semi-circular arc grooves are closed to form N axial holes arranged at equal intervals along the circumference, and the blade shaft is installed at the shaft hole through a bearing and a bushing, the inner side of the blade shaft is connected to the piston through a pin shaft, and the outer side of the blade shaft is fixedly connected to the blade.

[0010] Furthermore, an annular groove for installing a thrust bearing is provided on the inner side of the semicircular arc groove corresponding to the shaft hole.

[0011] Furthermore, a sealing ring installation groove is provided in the semicircular arc through groove corresponding to the shaft hole, and a sealing ring is installed.

[0012] Furthermore, a wear-resistant sleeve is added at the sliding matching surface between the piston and the front shell, and the surface of the wear-resistant sleeve has at least one channel for medium to pass through.

[0013] A reversing fan housing assembly is characterized in that it includes a front shell and a rear shell, wherein the mating surfaces of the front shell and the rear shell have a thickness thicker than the housing wall thickness, and semi-circular arc grooves that match each other are respectively arranged on the mating surfaces of the front shell and the rear shell. After the front shell and the rear shell are butt-fitted, the two semi-circular arc grooves close together to form N axial holes arranged at equal intervals along the circumference, and the fan blade shaft is installed at the axial hole through a thrust bearing and a bushing.

[0014] Furthermore, an annular groove for installing a thrust bearing is provided in the semicircular arc groove corresponding to the shaft hole.

[0015] Furthermore, a sealing ring installation groove is provided in the semicircular arc through groove corresponding to the shaft hole, and a sealing ring is installed.

[0016] Furthermore, the fan blade shaft is a stepped shaft, and the base at the inner end of the fan blade shaft for fixing the pin shaft is designed as a cam.

[0017] The bearing is a thrust bearing.

[0018] The beneficial effects of the utility model are:

[0019] This technology can be applied to pneumatic reversing fans or hydraulic reversing fans. By changing the three-section design of the annular fan housing to a two-section design of the front and rear housings, the number of parts of the housing is reduced, and the manufacturing and subsequent maintenance costs are reduced by reducing the number of parts. At the same time, the mechanical installation of the housing is more reliable and the overall strength of the housing is improved by reducing the number of parts.

[0020] After the technical modification, the shaft hole is located at the mating surface of the front shell and the rear shell, which is more conducive to the assembly of the fan shaft assembly, which has positive significance for improving the assembly efficiency of the product. Brief Description of the Drawings

[0021] Figure 1 This is a full sectional view of the present utility model.

[0022] Figure 2 This is a perspective view of the front housing.

[0023] Figure 3 This is a perspective view of the rear housing.

[0024] Figure 4 This is a perspective view of the wear-resistant sleeve.

[0025] Figure 5 This is a perspective view of the fan blade.

[0026] Figure 6 This is a perspective view of the fan blade shaft.

[0027] Figure 7 This is Figure 6 a side view of

[0028] Figure 8 This is Figure 7 a conventional design schematic of

[0029] In the figure:

[0030] 100 front housing, 110 outer ring of the front housing annular groove, 120 positioning groove,

[0031] 200 rear housing, 210 positioning protrusion,

[0032] 300 mating surface, 310 semi-circular through groove, 320 fastener mounting hole, 330 high-strength bolt, 340 annular card slot, 350 sealing ring mounting groove,

[0033] 400 fan blade shaft, 410 thrust bearing, 420 base, 421 outward expansion structure, 422 pin shaft, 430 shaft sleeve,

[0034] 500 piston, 510 wear-resistant sleeve, 520 channel, 520' channel,

[0035] 600 fan blade, 610 windward rib,

[0036] 700 pneumatic or hydraulic oil rotary joint,

[0037] 800 return spring. Detailed Description of the Preferred Embodiment

[0038] A reversing fan, the housing of which is changed from the traditional three-section design to a front and rear two-part structure, reducing the number of parts and making assembly and disassembly more convenient.

[0039] The following will be described in conjunction with the accompanying drawings of the specification Figure 1To the attached description Figure 8 A more refined introduction to the structure, principle, and function of the present utility model will be given. Specifically, the housing of the commutation fan is composed of a front housing 100, a rear housing 200, and fasteners. The preferred process for the front housing and the rear housing is aluminum alloy die casting. An innovative widened design is made at the mating surface 300 of the front housing and the rear housing, that is, at the mating surface 300 of the front housing and the rear housing, there is a thickness thicker than the wall thickness of the housing, and a semi-circular through groove 310 is provided at the mating surface of the front housing and the rear housing, and fastener mounting holes 320 are provided. After the front housing and the rear housing are butt-jointed and fitted, the two semi-circular through grooves are combined into a circular shaft hole, and this shaft hole is also the shaft hole of the fan blade shaft. And, after the front housing and the rear housing are butt-jointed and fitted, fasteners are used to fasten the front housing and the rear housing to form an integral body. Preferably, the fasteners for fastening the front housing and the rear side in this embodiment are preferably high-strength bolts 330.

[0040] Furthermore, a thrust bearing 410 is sleeved on the fan blade shaft 400. An annular clamping groove 340 is provided on the inner side of the periphery of the shaft hole formed by the front housing and the rear housing. There is a thrust bearing mounting surface in the annular clamping groove 340, and the thrust bearing 410 is arranged between the base and the annular clamping groove, bearing the axial centrifugal force generated during the operation of the fan blade.

[0041] Furthermore, a sealing ring mounting groove 350 is machined at a position near the outer side of the shaft hole for mounting a sealing ring, including but not limited to a rubber sealing ring.

[0042] Furthermore, on the inner edge of the mating surface between the above-mentioned front housing and rear housing, positioning protrusions and positioning grooves are provided. For example, in one case, the positioning groove 120 is provided on the inner edge of the front housing 100, and the positioning protrusion 210 is provided on the inner edge of the rear housing 200. The cooperation between the two has a centering effect and is used for the rapid positioning of the front housing and the rear housing during assembly.

[0043] Furthermore, the above-mentioned fan blade shaft 400 is a stepped shaft. In the installed state, from the inner end to the outer end along the axial direction, there are a base 420, a thrust bearing installation section, a bushing installation section, and a fan blade installation section in sequence. Among them, the base 420 of the fan blade shaft is located inside the housing and is movably fitted with the piston 500 of the fan through an eccentric pin shaft. The thrust bearing 410 is arranged between the fan blade shaft and the inner wall of the housing to form an axial force-bearing component. A bushing 430 is sleeved on the fan blade shaft and is embedded in the shaft hole formed after the front housing and the rear housing are fitted. The fan blade shaft 400 and the bushing are preferably made of wear-resistant alloy, and there is a wear-resistant characteristic between the two, so that it can operate without maintenance for a long time.

[0044] In this embodiment, the fan blade shaft 400 is connected to the fan blade 600. The inner end of the fan blade shaft is fixedly connected with a base 420. An eccentric pin shaft hole is fixedly connected to the base. Specifically, to reduce the volume of the base, the contour where the base 420 is located is designed as a smaller circle, and the part where the pin shaft hole is located extends to one side, forming a partially outward-expanded structure 420. The base has a cam contour design when viewed from the side. Refer to Figure 6 and Figure 7 , and a pin shaft hole is arranged at the position of the outward-expanded structure 421, and a pin shaft 422 is installed here. That is, the miniaturized design of the local part of the fan blade shaft can be realized. Of course, the base being in a disc shape or an eccentric structure is within the protection scope of the present invention. The effect refers to Figure 8 .

[0045] The front shell and the rear shell form a housing, and there is an installation cavity for the piston inside. The design of the middle annular body is omitted in this embodiment. The shaft holes for installing the fan blade shafts are evenly distributed around the circumferences of the connection positions of the front and rear shells, and the fan blade shafts are installed in the shaft holes. The outer side of the fan blade shaft is connected to the fan blade, and the inner side is slidably matched with the piston through the eccentrically designed pin shaft 422, which simplifies the component composition of the housing and makes the shaft holes located at the mating surface of the front and rear shells, facilitating the assembly and disassembly of the variable-direction fan. Therefore, the assembly process is optimized, which is also one of the innovations of this technology.

[0046] In this embodiment, the piston is installed in the front shell and moves axially, and drives the fan blade shaft to swing at an angle through the eccentrically designed pin shaft, realizing the commutation of the fan blade.

[0047] As a whole electromechanical product, the variable-direction fan is further improved as the above technical solution:

[0048] To reduce the direct sliding wear between the piston 500 and the front shell, a wear-resistant sleeve 510 is added between the piston and the front shell. The outer diameter of the piston is matched with the outer ring 110 of the annular groove of the front shell for axial sliding. A channel 520 is arranged on the outer ring 110 of the annular groove of the front shell, and there are multiple channels 520' on the wear-resistant sleeve 510 to ensure that the pressure source acts on the large surface of the piston through the channels.

[0049] Figure 1 The return spring 800 in

[0050] is a conventional configuration and will not be elaborated.

[0051] Further, in this embodiment, the fan blade 600 can be a conventional fan blade or a stiffened fan blade. The so-called stiffened fan blade means that the fan blade includes a main working surface and a secondary working surface, and at least one windward rib 610 is provided on the secondary working surface. The windward rib includes a flat portion and a bent portion. The flat portion is arranged along the length direction of the fan blade, and the bent portion bends towards the fixed seat and contacts the fixed seat to strengthen the strength. The width of the bent portion gradually decreases from the connecting portion with the flat portion to the contact portion with the fixed seat. The height of the flat portion is greater than the height of the fixed seat protruding from the secondary working surface. This kind of ribbed design not only increases the air volume of the secondary working surface but also can increase the strength of the fan blade.

[0052] A pneumatic or hydraulic oil rotary joint 700 is mechanically assembled on the front shell for connecting to a power source. The pneumatic or hydraulic oil rotary joint 700 is a general conventional functional component in this industry and belongs to the scope of the prior art, so it will not be elaborated herein.

[0053] The above-described embodiments are only descriptions of the preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those skilled in the relevant art to the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A reversing fan, characterized in that: The shell of the reversing fan includes a front shell and a rear shell. Semicircular arc grooves that match each other are respectively arranged at the mating surfaces of the front shell and the rear shell. After the front shell and the rear shell are butt-fitted, the two semicircular arc grooves close together to form N axial holes arranged at equal intervals along the circumference. The fan blade shaft is installed at the axial hole through a bearing and a sleeve. The inner side of the fan blade shaft is connected to the piston through a pin shaft, and the outer side of the fan blade shaft is fixedly connected to the fan blade.

2. The reversing fan according to claim 1, characterized in that: An annular groove for installing a thrust bearing is arranged inside the semicircular arc groove corresponding to the shaft hole.

3. The reversing fan according to claim 2, characterized in that: A sealing ring installation groove is arranged in the semicircular arc through groove corresponding to the shaft hole, and a sealing ring is installed therein.

4. The reversing fan according to claim 3, characterized in that: A wear-resistant sleeve is added at the sliding matching surface between the piston and the front shell, and the surface of the wear-resistant sleeve has at least one channel for medium to pass through.

5. The reversing fan according to claim 1, characterized in that: The bearing is a thrust bearing.

6. A reversing fan housing assembly, characterized in that: It comprises a front shell and a rear shell, and semi-circular arc grooves matched with each other are respectively arranged at the mating surfaces of the front shell and the rear shell. After the front shell and the rear shell are butt-jointed, the two semi-circular arc grooves are closed to form N axial holes arranged at equal intervals along the circumference.

7. The reversing fan housing assembly according to claim 6, characterized in that: An annular groove for installing a thrust bearing is arranged in the semicircular arc through groove corresponding to the shaft hole.

8. The reversing fan housing assembly according to claim 7, characterized in that: A sealing ring installation groove is arranged in the semicircular arc through groove corresponding to the shaft hole, and a sealing ring is installed therein.

Images