Oil inlet assembly, fan shell and reversing fan

Abstract

The utility model discloses an oil inlet assembly, a fan shell and a reversing fan, solves the problems that an oil inlet assembly used in an existing reversing fan is large in size and large in number of parts due to the fact that the internal structure is complex, and is used for reducing manufacturing cost and use cost. The oil inlet assembly comprises an oil inlet shaft, a bearing and a combined sealing piece, and is characterized in that the oil inlet shaft is provided with an oil inlet end, an oil outlet end, a bearing mounting section and a dynamic sealing section, and the bearing mounting section and the dynamic sealing section are located between the oil inlet end and the oil outlet end; the bearing is mounted on the bearing mounting section; the combined sealing piece is installed on the dynamic sealing section. According to the technology, the oil inlet assembly is redesigned, a combined body with the oil inlet shaft, the bearing, the combined sealing piece and the clamping spring as parts is formed, the structure is simple and efficient, the design of a shell of a rotary connector is omitted, the size of a product is reduced, and the oil inlet assembly and a front shell are directly installed.

Description

Technical Field

[0001] The utility model relates to the technical field of oil inlet components of hydraulic and pneumatic reversing fans. Background Art

[0002] Taking a hydraulic reversing fan as an example, in order to drive the reversing of the fan blades, a micro hydraulic oil pumping system needs to be configured. The micro hydraulic pumping system needs to pump hydraulic oil to the reversing fan through an oil pipe and a rotating hydraulic joint to achieve the drive for the reversing of the fan blades.

[0003] Representative examples of hydraulic rotary joints in this industry include: CN221482012U discloses an oil inlet assembly, which includes an oil inlet joint, a displacement sensor, an oil inlet pipeline, a rotary bearing, a sealing ring, and a float. The oil inlet pipeline is radially connected to the oil pipe via the oil inlet joint, the displacement sensor is threaded onto the oil inlet pipeline, and the float is embedded in the piston end face, forming a rotary sealed oil inlet passage. This oil inlet assembly is a separate assembly, mounted in a mounting hole via a retaining ring. This complex structure requires more parts and is more expensive to manufacture.

[0004] Based on the above problems, the present invention develops a new oil inlet assembly with a simpler and more practical structure. The oil inlet assembly is directly integrated with the fan housing, which reduces the number of parts used and the volume, and can be widely used in reversing fan design. Utility Model Content

[0005] In order to address the deficiencies of the prior art, the utility model provides an oil inlet assembly, a fan housing and a reversing fan, which solve the problem of large size and many parts of the oil inlet assembly used in the existing reversing fan due to its complex internal structure, and are used to reduce manufacturing costs and use costs.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] The oil inlet assembly includes an oil inlet shaft, a bearing and a combined seal, and is characterized in that the oil inlet shaft has an oil inlet end, an oil outlet end, and a bearing mounting section and a dynamic sealing section located between the oil inlet end and the oil outlet end; the bearing is mounted on the bearing mounting section; and the combined seal is mounted on the dynamic sealing section.

[0008] Shaft shoulders and retaining spring mounting grooves are provided on both sides of the bearing mounting section, and the shaft shoulders and retaining springs fix the inner ring of the bearing.

[0009] The combined sealing element comprises a polytetrafluoroethylene sealing ring and a rubber sealing ring, and the rubber sealing ring is installed in the installation groove of the polytetrafluoroethylene sealing ring.

[0010] An annular groove is provided on the side surface of the polytetrafluoroethylene sealing ring.

[0011] The fan housing has a mounting hole on the front shell, and the mounting hole is a through hole. It is characterized in that the oil inlet assembly is fixedly mounted in the mounting hole by external or internal installation.

[0012] The oil inlet assembly is installed by internal installation. An annular convex ring is arranged in the installation hole, a bearing is installed on the outer side of the convex ring, and a combined seal is installed on the inner side of the convex ring.

[0013] The oil inlet assembly is installed externally, a shoulder is provided in the installation hole, the combined seal rests on the shoulder, and an annular bearing pad is provided in the gap between the combined seal and the bearing.

[0014] There are two combined seals, and a bearing pad is provided in the gap between the two combined seals.

[0015] A reversing fan includes a housing, a piston, a return spring, a blade shaft and blades, wherein the piston is installed in the piston cavity of the housing and has a propulsion action driven by the hydraulic oil of the oil inlet assembly, the return spring is installed in the opposite direction of the oil inlet assembly, and works together with the hydraulic oil to realize the reciprocating motion of the piston, and a slide groove is provided on the piston, and the slide groove is used to slide with the eccentric pin. The above-mentioned blade shaft is rotatably installed in the shaft hole of the housing through a bearing assembly, and the shaft hole is perpendicular to the axis of movement of the above-mentioned piston. The outer end of the blade shaft is installed with blades, and the inner end is located in the housing and fixedly installed with an eccentric pin. The eccentric pin has an eccentric position relative to the axis of the blade shaft. When the above-mentioned piston reciprocates, it drives the above-mentioned blade shaft to perform an angle adjustment action.

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

[0017] This technology redesigns the oil inlet assembly into a single component assembly consisting of an oil inlet shaft, bearing, combined seal, and retaining ring. This results in a simple and efficient structure. The housing design eliminates the need for a rotary joint, reducing the product's size and enabling direct mounting to the front housing. In this design, the fan's front housing serves as both the piston mounting point and the oil inlet assembly housing, making the fan's structural design more concise and efficient.

[0018] The oil inlet assembly in this structure can be installed in various ways to meet the different needs of interior and exterior installation.

[0019] In this technology, the structure of the combined seal is optimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the structural diagram of the oil inlet component.

[0021] Figure 2This is a way to install the oil inlet assembly in the front housing, showing the internal installation and double sealing structure.

[0022] Figure 3 This is an installation method of the oil inlet assembly in the front housing, showing the external installation and double seal structure.

[0023] Figure 4 This is a way to install the oil inlet assembly in the front housing, showing an internal installation and single seal structure.

[0024] Figure 5 This is an installation method for the oil inlet assembly in the front housing, showing an externally mounted, single-seal structure.

[0025] In the picture:

[0026] 10 oil inlet assembly, 11 oil inlet shaft, 111 oil inlet end, 112 oil outlet end, 12 bearing, 13 combined seal, 131 PTFE seal ring, 132 rubber seal ring, 133 groove, 14 retaining ring, 15 shaft shoulder,

[0027] 20 front housing, 21 convex ring, 22 bearing pad, 23 shoulder,

[0028] 30 pistons,

[0029] 40 return spring,

[0030] 50 fan blade shaft,

[0031] 60 eccentric pin. DETAILED DESCRIPTION

[0032] The oil inlet assembly 10 includes an oil inlet shaft 11, a bearing 12, a combined seal 13, and a retaining spring 14. The oil inlet shaft is a cylindrical machined component with an oil inlet passage defined therein. The oil inlet shaft is segmented and includes an oil inlet end 111, an oil outlet end 112, and a bearing mounting section and a dynamic seal section located between the two ends.

[0033] A shoulder 15 and a retaining spring mounting groove are provided on the outer side of the oil inlet shaft 11. The shoulder 15 is used for installing the bearing. Specifically, the shoulder 15 is used to position and fix the inner ring of the bearing, and at least two bearings 12 are installed on the oil inlet shaft between the shoulder 15 and the retaining spring mounting groove. A retaining spring 14 is installed in the retaining spring mounting groove. The retaining spring acts on the inner ring of the bearing to firmly fix the bearing on the bearing mounting section of the above-mentioned oil inlet shaft.

[0034] Furthermore, the two bearings 12 are deep groove ball bearings used in combination, preferably maintenance-free deep groove ball bearings with dust covers.

[0035] Furthermore, the two bearings 12 are deep groove ball bearings used in combination, preferably maintenance-free deep groove ball bearings with dust covers, and are arranged in a back-to-back or face-to-face combination.

[0036] Furthermore, the above-mentioned deep groove ball bearing can be replaced by other bearings with similar effects, which is also within the scope of protection of the present invention.

[0037] At least one set of combined seals 13 is installed on the dynamic sealing section of the oil inlet shaft. The combined seals are installed on the oil inlet shaft in a sleeve-type manner.

[0038] In a preferred embodiment, the combined seal 13 includes a polytetrafluoroethylene (PTFE) seal ring 131 and a rubber seal ring 132. The polytetrafluoroethylene (PTFE) seal ring has a certain thickness, which is theoretically no less than the radius of the oil inlet shaft and no less than 6 mm, to ensure axial rigidity. A mounting groove for the rubber seal ring is provided in the polytetrafluoroethylene (PTFE) seal ring 131. The rubber seal ring is installed in the mounting groove. After installation, the rubber seal ring and the polytetrafluoroethylene seal ring form an integral unit, i.e., the combined seal. This combined seal can be used in combination; for example, one or two sets can be mounted on the oil inlet shaft as needed.

[0039] Furthermore, the above-mentioned rubber sealing ring is an O-shaped rubber sealing ring, or a sealing ring made of other materials with similar effects.

[0040] Furthermore, the side of the aforementioned PTFE seal ring 131 is provided with an annular groove 133, which effectively improves the elasticity of the PTFE seal ring, allowing it to maintain sufficient elastic contact with the surface of the oil inlet shaft. This has a positive effect on compensating for deformation of the PTFE seal ring after the temperature rises.

[0041] A fan housing has a mounting hole for an oil inlet assembly on the front housing 20. The mounting hole is a through hole for mounting the oil inlet assembly. Four scenarios are described below based on the different mounting methods of the oil inlet assembly on the front housing:

[0042] Method 1, reference Figure 2 The oil inlet assembly is installed using an internally mounted, dual-seal structure. The so-called internal mounting refers to the following: an annular raised ring 21 is positioned within the mounting hole. The outer side of this raised ring 21 is mounted to mate with the bearing, with the outer ring of the bearing resting against the raised ring. A retaining spring mounting groove is provided in the mounting hole on the outer side of the raised ring, and a retaining spring 14 is installed therein, securing the bearing. Two sets of combined seals are installed from the inside of the mounting hole on the other side of the raised ring. These are then fitted onto the oil inlet shaft and initially positioned by the rubber sealing ring. The two sets of combined seals are spaced a certain distance apart.

[0043] Method 2, reference Figure 3 The oil inlet assembly is installed using an external, dual-seal structure. External installation refers to the installation of a shoulder 23 within the mounting hole, with the oil inlet assembly installed from the outside. The combined seal rests against this shoulder 23, and a retaining spring 14 is used at the outer end of the mounting hole to quickly secure the oil inlet assembly. This installation method is faster and more efficient than the wall method. It should be noted that in this method, an annular bearing pad 22 is installed in the gap between the two combined seals and between the combined seal and the bearing to maintain a predetermined spacing between them. This installation method requires only a single retaining spring for quick installation from the outside.

[0044] Method 3, reference Figure 4 , the oil inlet assembly is installed with an internal installation and a single sealing structure. The so-called internal installation means that an annular convex ring 21 is provided in the mounting hole, and the outer side of the convex ring is installed to cooperate with the bearing, that is, the outer ring of the bearing is against the convex ring, and a retaining ring mounting groove is provided at the mounting hole on the outer side of the convex ring and a retaining ring 14 is installed to achieve fixed installation of the above-mentioned bearing. A group of combined seals are installed from the inside into the mounting hole on the other side of the convex ring 21, and are mounted on the above-mentioned oil inlet shaft and are initially positioned under the action of the rubber sealing ring. An annular retaining ring 24 is provided on both sides of the combined seal. The annular retaining ring is preferably a metal retaining ring. The two annular retaining rings limit the axial displacement of the combined seal and have a limiting effect. Refer to Figure 4 One of the annular retaining rings is clamped in the retaining ring mounting groove of the mounting hole using a retaining ring.

[0045] Method 4, reference Figure 5 The oil inlet assembly is installed using an external, single-seal structure. External installation means that a shoulder 23 is positioned within the mounting hole, the oil inlet assembly is installed from the outside, the combined seal rests against this shoulder 23, and a retaining spring is used at the outer end of the mounting hole to quickly secure the oil inlet assembly. This installation method is faster and more efficient than the wall-mounted method. It is important to note that in this method, an annular bearing washer 22 is placed in the gap between the combined seal and the bearing to maintain a predetermined spacing between them. This installation method requires only a single retaining spring for quick installation from the outside.

[0046] A reversing fan includes a housing, a piston 30, a return spring 40, a blade shaft 50, blades, an eccentric pin 60, etc., wherein the piston 30 is installed in the piston cavity of the housing and has a propulsion action under the drive of the hydraulic oil of the oil inlet assembly. The return spring is installed in the opposite direction of the oil inlet assembly and acts together with the hydraulic oil to realize the reciprocating motion of the piston. A slide groove is provided on the piston, and the slide groove is used to slide with the eccentric pin. The above-mentioned blade shaft is rotatably installed in the shaft hole of the housing through a bearing assembly. The shaft hole is perpendicular to the axis of movement of the above-mentioned piston. The outer end of the blade shaft is equipped with blades, and the inner end is located in the housing and is fixedly installed with an eccentric pin. The eccentric pin has an eccentric position relative to the axis of the blade shaft. When the above-mentioned piston reciprocates, it drives the above-mentioned blade shaft to perform an angle adjustment action. The housing of the reversing fan consists of two parts, a front housing and a rear housing, that is, a two-part design. It can also be designed to consist of three parts, a front part, a rear part, and a middle part, that is, a three-part design according to needs. All of these are within the scope of application of this oil inlet assembly and should be protected. Whether it is a two-part design or a three-part design,

[0047] The front housing has a mounting hole for the oil inlet assembly. The mounting method of the oil inlet assembly and the front housing can refer to the above description and will not be repeated here.

[0048] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements to the present invention by relevant technical personnel in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. An oil inlet assembly comprising an oil inlet shaft (11), a bearing (12) and a combined seal (13), characterized in that: The oil inlet shaft comprises an oil inlet end, an oil outlet end, and a bearing mounting section and a dynamic sealing section located between the oil inlet end and the oil outlet end; the bearing is mounted in the bearing mounting section; and the combined seal (13) is mounted in the dynamic sealing section.

2. The oil inlet assembly according to claim 1, characterized in that: Shaft shoulders and retaining spring mounting grooves are provided on both sides of the bearing mounting section, and the shaft shoulders and retaining springs fix the inner ring of the bearing.

3. The oil inlet assembly according to claim 1, characterized in that: The combined sealing element (13) comprises a polytetrafluoroethylene sealing ring (131) and a rubber sealing ring (132), wherein the rubber sealing ring (132) is installed in a mounting groove of the polytetrafluoroethylene sealing ring (131).

4. The oil inlet assembly according to claim 3, characterized in that: An annular groove (133) is provided on the side surface of the polytetrafluoroethylene sealing ring (131).

5. A fan housing, wherein the front shell (20) of the fan housing has a mounting hole, the mounting hole being a through hole, characterized in that: The oil inlet assembly according to any one of claims 1 to 4 is fixedly installed in the mounting hole by external or internal installation.

6. The fan housing according to claim 5, characterized in that The oil inlet assembly is installed by internal installation, and an annular convex ring (21) is arranged in the installation hole, a bearing is installed on the outside of the convex ring (21), and a combined seal is installed on the inside of the convex ring.

7. The fan housing according to claim 5, wherein: The oil inlet assembly is installed externally, a shoulder (23) is provided in the installation hole, the combined seal rests on the shoulder (23), and an annular bearing pad (22) is provided in the gap between the combined seal and the bearing.

8. The fan housing according to claim 6 or 7, characterized in that: There are two combined seals, and a bearing pad (22) is provided in the gap between the two combined seals.

9. A reversing fan, comprising a housing, a piston (30), a return spring (40), a fan shaft (50) and fan blades, characterized in that: The front shell (20) of the housing has a mounting hole, which is a through hole. The oil inlet assembly is fixedly mounted in the mounting hole by external or internal mounting. The oil inlet assembly includes an oil inlet shaft (11), a bearing (12) and a combined seal (13). The oil inlet shaft has an oil inlet end, an oil outlet end, and a bearing mounting section and a dynamic sealing section located between the oil inlet end and the oil outlet end; the bearing is mounted in the bearing mounting section; and the combined seal (13) is mounted in the dynamic sealing section.

10. The reversing fan according to claim 9, characterized in that: The piston is installed in the piston cavity of the housing and has a propulsion action driven by the hydraulic oil of the oil inlet assembly. The return spring is installed in the opposite direction of the oil inlet assembly and works together with the hydraulic oil to realize the reciprocating motion of the piston. A slide groove is provided on the piston, which is used to slide with the eccentric pin. The fan shaft is rotatably mounted in an axial hole of the housing through a bearing assembly, the axial hole being perpendicular to the piston movement axis. The fan blade is mounted on the outer end of the fan shaft, and the inner end is located in the housing and fixedly mounted with an eccentric pin. The eccentric pin has an eccentric position relative to the axis of the fan shaft. When the piston reciprocates, it drives the fan shaft to adjust its angle.

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