Lubricating oil driven mechanical pump for wind turbine gearbox lubrication and cooling system and wind turbine gearbox lubrication and cooling system

Abstract

This utility model discloses an improved mechanical pump for lubricating oil driving in a wind turbine gearbox lubrication and cooling system, and a wind turbine gearbox lubrication and cooling system, solving the technical problem of ensuring the service life of the mechanical pump without eliminating the radial bearing at the output end of the branch gear shaft. It includes a pump housing and a rotating shaft mounted in the pump housing via a front rotating support and a rear rotating support. The rotating shaft is equipped with a mechanical booster mechanism that rotates with the shaft. The front end of the pump housing has a mounting interface. In use, the pump housing is mounted on the housing of the wind turbine gearbox through the mounting interface, and the input end of the rotating shaft extends out of the mounting interface and connects to the output end of the branch gear shaft in the wind turbine gearbox. A dynamic seal is installed between the rotating shaft and the mounting interface. The front rotating support includes a front rolling bearing installed between the rotating shaft and the mounting interface. The front rolling bearing serves as the only radial bearing from the output end of the branch gear shaft to the position on the rotating shaft where the rolling bearing is mounted.

Description

Technical Field

[0001] This utility model relates to the technical field of wind turbine gearbox lubrication and cooling systems, specifically to a mechanical pump for lubricating oil drive in a wind turbine gearbox lubrication and cooling system and a wind turbine gearbox lubrication and cooling system. Background Technology

[0002] The wind turbine gearbox lubrication and cooling system is an important component of the wind turbine generator set. Among them, the lubricating oil driven mechanical pump plays the role of providing lubricating oil circulation drive for the wind turbine gearbox lubrication and cooling system.

[0003] like Figure 1 As shown, the applicant's current lubricating oil driven mechanical pump mainly includes a pump housing 1 and a rotating shaft 2 mounted in the pump housing 1 via a front rotating support and a rear rotating support. The rotating shaft 2 is equipped with a mechanical booster mechanism that rotates with it. The structure and principle of the mechanical booster mechanism can be referenced to the "internal meshing gear pair" in patent document CN117703746A, but should not be construed as a limitation on the mechanical booster mechanism in this application. The pump housing 1 has a mounting interface 11 (specifically a flange) at its front end. In use, the pump housing 1 is mounted on the housing of a wind turbine gearbox via the mounting interface 11, and the input end of the rotating shaft 2 extends out of the mounting interface 11 and is connected to the output end of a branch gear shaft in the wind turbine gearbox via a coupling. A dynamic seal 3 is installed between the rotating shaft 2 and the mounting interface 11. Currently, the output end of the branch gear shaft is equipped with a radial bearing, which bears the radial force generated by the rotation of the branch gear shaft. The front rotating support in the mechanical pump uses a simple bearing bush. Since the radial force generated by the rotation of the branch gear shaft is borne by the radial bearing at the output end of the branch gear shaft, the bearing bush in the mechanical pump can meet the usage requirements.

[0004] During the use of the wind turbine gearbox lubrication and cooling system, the inventors noticed that the branch gear shaft has a large diameter, and the radial bearing at the output end of the branch gear shaft is actually a relatively complex and costly radial bearing. If the radial bearing at the output end of the branch gear shaft were eliminated, and the output end of the branch gear shaft were directly connected to the input end of the rotating shaft 2 via a coupling, the gearbox structure could be simplified and the manufacturing cost reduced. In putting this technical concept into practice, the inventors further discovered that when the radial bearing is not installed at the output end of the branch gear shaft, the radial force generated during the rotation of the branch gear shaft cannot be effectively supported inside the gearbox. This radial force is transmitted to the rotating shaft 2 of the mechanical pump through the coupling. The existing bearing bushes cannot effectively withstand this radial force, leading to faster wear of the dynamic seal 3, which in turn causes the mechanical pump to fail, affecting the reliability and service life of the wind turbine gearbox lubrication and cooling system. Utility Model Content

[0005] The purpose of this invention is to provide an improved mechanical pump for lubricating oil drive in a wind turbine gearbox lubrication and cooling system and a wind turbine gearbox lubrication and cooling system, so as to solve the technical problem of ensuring the service life of the mechanical pump when the radial bearing at the output end of the branch gear shaft is eliminated.

[0006] In a first aspect, a mechanical pump for driving lubricating oil in a wind turbine gearbox lubrication and cooling system includes a pump housing and a rotating shaft mounted in the pump housing via a front rotating support and a rear rotating support. The rotating shaft is provided with a mechanical boosting mechanism that rotates with the rotating shaft. The front end of the pump housing has a mounting interface. In use, the pump housing is mounted on the housing of the wind turbine gearbox via the mounting interface, and the input end of the rotating shaft extends out of the mounting interface and is connected to the output end of a branch gear shaft in the wind turbine gearbox. A dynamic seal is installed between the rotating shaft and the mounting interface. The front rotating support includes a front rolling bearing installed between the rotating shaft and the mounting interface. The front rolling bearing serves as the only radial bearing from the output end of the branch gear shaft to the position on the rotating shaft where the rolling bearing is mounted.

[0007] As an optimization and / or instantiation of the aforementioned mechanical pump for lubricating oil drive in the wind turbine gearbox lubrication and cooling system, further: the front rolling bearing is located in the front face of the mounting interface in front of the dynamic seal.

[0008] As an optimization and / or instance of the aforementioned mechanical pump for lubricating oil drive in the wind turbine gearbox lubrication and cooling system, further: the rear end of the pump housing has a sealed end cap, and the rear rotating support includes a rear rolling bearing mounted between the rotating shaft and the sealed end cap.

[0009] As an optimization and / or instantiation of the aforementioned mechanical pump for lubricating oil drive in the wind turbine gearbox lubrication and cooling system, further: the rear rolling bearing adopts a thrust ball bearing.

[0010] As an optimization and / or instantiation of the aforementioned mechanical pump for lubricating oil drive in the wind turbine gearbox lubrication and cooling system, further: the front rotating support also includes a bearing bush installed between the rotating shaft and the pump housing, the axial position of the bearing bush being located between the front rolling bearing and the mechanical supercharging mechanism.

[0011] As an optimization and / or instantiation of the aforementioned mechanical pump for driving lubricating oil in the wind turbine gearbox lubrication and cooling system, further: the mechanical booster mechanism is an internal meshing gear pair, with the inner rotor of the internal meshing gear pair mounted on a rotating shaft.

[0012] As an optimization and / or instantiation of the aforementioned mechanical pump for lubricating oil drive in the wind turbine gearbox lubrication and cooling system, further: the dynamic seal adopts a skeleton seal ring.

[0013] As an optimization and / or instantiation of the aforementioned mechanical pump for driving lubricating oil in the wind turbine gearbox lubrication and cooling system, further: the output end of the branch gear shaft is connected to the input end of the rotating shaft via a coupling without bearing support.

[0014] As an optimization and / or instance of the aforementioned mechanical pump for lubricating oil drive in the wind turbine gearbox lubrication and cooling system, further: the front rolling bearing adopts a deep groove ball bearing.

[0015] Secondly, a wind turbine gearbox lubrication and cooling system employs a mechanical pump for lubricating oil drive in the wind turbine gearbox lubrication and cooling system described in the first aspect above.

[0016] The mechanical pump for lubricating oil drive in the lubrication and cooling system of a wind turbine gearbox provided by this utility model achieves the following beneficial effects by setting a front rolling bearing in the front rotating support, making the front rolling bearing the only radial bearing from the output end of the branch gear shaft to the position where the rolling bearing is installed on the rotating shaft:

[0017] First, it effectively solves the problem of radial force support after removing the radial bearing at the output end of the branch gear shaft. When the radial bearing is not installed at the output end of the branch gear shaft, the radial force generated by the branch gear shaft during rotation is transmitted to the rotating shaft through the coupling. At this time, the front rolling bearing can effectively withstand this radial force, avoiding the mechanical pump failure problem caused by the original bearing shell being unable to withstand the radial force.

[0018] Secondly, it ensures the reliability and service life of the dynamic seals. By using the front rolling bearing to bear the radial force, the radial force is prevented from acting directly on the dynamic seals, thus preventing rapid wear of the dynamic seals and ensuring the sealing performance and service life of the mechanical pump.

[0019] Furthermore, it supports the simplification of gearbox structure and cost optimization. The mechanical pump of this invention can be adapted to gearbox designs where the radial bearing at the output end of the branch gear shaft is eliminated, thereby supporting the simplification of gearbox structure and the reduction of manufacturing costs.

[0020] Finally, the reliability of the entire wind turbine gearbox lubrication and cooling system was improved. Through reasonable radial force distribution and support, the stable operation of the lubricating oil-driven mechanical pump was ensured under the simplified gearbox design conditions, guaranteeing the reliability and service life of the entire lubrication and cooling system.

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Additional aspects and advantages of the present invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice. Attached Figure Description

[0022] The accompanying drawings, which form part of this specification, are used to aid in understanding the present invention. The contents provided in the drawings and their related descriptions in this specification can be used to explain the present invention, but do not constitute an undue limitation on the present invention.

[0023] Figure 1 This is a structural schematic diagram of a lubricating oil-driven mechanical pump currently being manufactured by the applicant.

[0024] Figure 2 This is a schematic diagram of the structure of the lubricating oil driven mechanical pump according to Embodiment 1 of this utility model.

[0025] The following are marked in the diagram: Pump casing 1; Mounting interface 11; Sealing end cover 12; Rotary shaft 2; Dynamic seal 3; Front rolling bearing 41; Bearing shell 42; Rear rolling bearing 51; Internal meshing gear pair 6. Detailed Implementation

[0026] The present invention will now be clearly and completely described in conjunction with the accompanying drawings. Those skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly noted that:

[0027] The technical solutions and features provided in the various sections, including the following description, can be combined with each other without conflict. Furthermore, where possible, these technical solutions, features, and related combinations can be given specific technical subject matter and protected by relevant patents.

[0028] The embodiments of the present invention described below are generally only some embodiments and not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of patent protection.

[0029] Regarding the terminology and units in this specification: The terms "comprising," "including," and any variations thereof in this specification, the corresponding claims, and related sections are intended to cover non-exclusive inclusion. Other related terms and units can be reasonably interpreted based on the relevant content provided in this specification.

[0030] Example 1

[0031] like Figure 2As shown in Embodiment 1 of this utility model, the mechanical pump for driving lubricating oil in the lubrication and cooling system of a wind turbine gearbox includes a pump housing 1 and a rotating shaft 2 mounted in the pump housing 1 via a front rotating support and a rear rotating support. The rotating shaft 2 is provided with a mechanical boosting mechanism that rotates with the rotating shaft 2. The front end of the pump housing 1 has a mounting interface 11. In use, the pump housing 1 is mounted on the housing of the wind turbine gearbox through the mounting interface 11, and the input end of the rotating shaft 2 extends out of the mounting interface 11 and is connected to the output end of the branch gear shaft in the wind turbine gearbox. A dynamic seal 3 is installed between the rotating shaft 2 and the mounting interface 11.

[0032] In this embodiment, the front rotating support includes a front rolling bearing 41 installed between the rotating shaft 2 and the mounting interface 11. The front rolling bearing 41 serves as the sole radial bearing from the output end of the branch gear shaft to the position on the rotating shaft 2 where the rolling bearing 41 is installed. This arrangement is intended to effectively withstand the radial force transmitted from the branch gear shaft through the coupling, ensuring the normal operation of the mechanical pump.

[0033] Specifically, the front rolling bearing 41 is positioned in front of the dynamic seal 3, located in the front end face of the mounting interface 11. This arrangement allows the front rolling bearing 41 to directly withstand the radial force from the branch gear shaft, preventing the radial force from being transmitted to the dynamic seal 3, thereby protecting the dynamic seal 3 from the influence of the radial force.

[0034] The pump casing 1 has a sealing end cover 12 at its rear end, and the rear rotating support includes a rear rolling bearing 51 installed between the rotating shaft 2 and the sealing end cover 12. The rear rolling bearing 51 is a thrust ball bearing, which mainly bears the axial force of the rotating shaft 2 and works with the front rolling bearing 41 to provide full support for the rotating shaft 2.

[0035] The front rotating support also includes a bearing shell 42 installed between the rotating shaft 2 and the pump housing 1. The axial position of the bearing shell 42 is located between the front rolling bearing 41 and the mechanical supercharging mechanism. In this embodiment, the bearing shell 42 plays an auxiliary supporting role. Since the main radial force is borne by the front rolling bearing 41, the bearing shell 42 mainly bears a smaller radial load.

[0036] The mechanical supercharging mechanism consists of an internal meshing gear pair 6, with its inner rotor mounted on a rotating shaft 2. Driven by the rotating shaft 2, the internal meshing gear pair 6 rotates to achieve the functions of pressurizing and delivering lubricating oil. The structure and principle of the internal meshing gear pair 6 can be found in patent document CN117703746A, but should not be construed as limiting the mechanical supercharging mechanism in this application.

[0037] The dynamic seal 3 uses a skeleton seal ring, which is set between the rotating shaft 2 and the mounting interface 11 to prevent lubricating oil from leaking from inside the mechanical pump.

[0038] In the application scenario of this embodiment, the output end of the branch gear shaft is connected to the input end of the rotating shaft 2 via a coupling without bearing support. This connection method simplifies the structural design of the gearbox and reduces manufacturing costs.

[0039] The front rolling bearing 41 is a deep groove ball bearing, which has good radial load capacity and high speed adaptability, and can meet the requirements of the wind turbine gearbox lubrication and cooling system.

[0040] This invention also provides a wind turbine gearbox lubrication and cooling system, which employs the aforementioned mechanical pump for driving lubricating oil in a wind turbine gearbox lubrication and cooling system. This wind turbine gearbox lubrication and cooling system can operate normally without the radial bearing at the output end of the branch gear shaft, achieving structural simplification and cost optimization.

[0041] Example 2

[0042] The mechanical pump for lubricating oil drive in the wind turbine gearbox lubrication and cooling system provided in Embodiment 2, based on the mechanical pump for lubricating oil drive in the wind turbine gearbox lubrication and cooling system in Embodiment 1, eliminates the bearing 42. This design further simplifies the structure of the mechanical pump and reduces manufacturing costs.

[0043] The foregoing has described the relevant content of this utility model. Those skilled in the art will be able to implement this utility model based on these descriptions. All other embodiments obtained by those skilled in the art based on the foregoing content of this specification without inventive effort should fall within the scope of patent protection.

Claims

1. A mechanical pump for driving lubricating oil in a wind turbine gearbox lubrication and cooling system, comprising a pump housing (1) and a rotating shaft (2) mounted in the pump housing (1) via a front rotating support and a rear rotating support, wherein the rotating shaft (2) is provided with a mechanical boosting mechanism that rotates with the rotating shaft (2), the front end of the pump housing (1) has an installation interface (11), and in use, the pump housing (1) is mounted on the housing of the wind turbine gearbox via the installation interface (11), and the input end of the rotating shaft (2) extends out of the installation interface (11) and is connected to the output end of the branch gear shaft in the wind turbine gearbox, wherein a dynamic seal (3) is installed between the rotating shaft (2) and the installation interface (11), characterized in that: The front rotating support includes a front rolling bearing (41) mounted between the shaft (2) and the mounting interface (11). The front rolling bearing (41) serves as the only radial bearing from the output end of the branch gear shaft to the position on the shaft (2) where the rolling bearing (41) is mounted.

2. A mechanical pump for driving the lubricating oil of a wind turbine gearbox lubricating and cooling system according to claim 1, characterized in that: The front rolling bearing (41) is located in front of the dynamic seal (3) in the front end face of the mounting interface (11).

3. A mechanical pump for driving the lubricating oil of a wind turbine gearbox lubricating and cooling system according to claim 1, characterized in that: The pump housing (1) has a sealing end cap (12) at its rear end, and the rear rotating support includes a rear rolling bearing (51) installed between the rotating shaft (2) and the sealing end cap (12).

4. A mechanical pump for driving the lubricating oil of a wind turbine gearbox lubricating and cooling system according to claim 3, characterized in that: The rear rolling bearing (51) is a thrust ball bearing.

5. A mechanical pump for driving the lubricating oil of a wind turbine gearbox lubricating and cooling system according to claim 1, characterized in that: The front rotating support also includes a bearing (42) installed between the rotating shaft (2) and the pump housing (1), with the bearing (42) located axially between the front rolling bearing (41) and the mechanical supercharging mechanism.

6. A mechanical pump for driving the lubricating oil of a wind turbine gearbox lubricating and cooling system according to claim 1, characterized in that: The mechanical booster mechanism is an internal meshing gear pair (6), and the inner rotor of the internal meshing gear pair (6) is mounted on the rotating shaft (2).

7. A mechanical pump for driving the lubricating oil of a wind turbine gearbox lubricating and cooling system according to claim 1, characterized in that: The dynamic seal (3) adopts a skeleton seal ring.

8. The mechanical pump for lubricating oil drive in the wind turbine gearbox lubrication and cooling system as described in claim 1, characterized in that: The output end of the branch gear shaft is connected to the input end of the rotating shaft (2) via a coupling without bearing support.

9. A mechanical pump for driving the lubricating oil of a wind turbine gearbox lubricating and cooling system according to any of the claims 1-8, characterized in that: The front rolling bearing (41) is a deep groove ball bearing.

10. A wind turbine gearbox lubrication cooling system characterised in that: It employs a mechanical pump for lubricating oil drive in the wind turbine gearbox lubrication and cooling system as described in any one of claims 1-9.

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