A lubricating oil circulating cooling device for an electric cylinder driving system

Abstract

The utility model relates to lubricating technical field of mechanical structure especially relates to a kind of lubricating oil circulating cooling device of electric cylinder driving system, including the oil pool consisting of shaft, bearing seat, shell and the sealing seat on bearing seat;The bottom of oil pool is also provided with oil storage structure, and the bottom of oil pool and oil storage structure is respectively provided with oil drain, and the circulating cooling device further includes oil pump, the inlet of oil pump is connected with two oil drains respectively, the outlet of oil pump is connected with oil pool, and cooler for cooling lubricating oil is further provided on input oil pipe and / or output oil pipe.Due to bearing is directly immersed in oil pool, therefore can better cool and lubricate bearing, and by the setting of oil pump and cooler, lubricating oil is always maintained at appropriate temperature, thereby solve the problem that the lubricating oil in the electric cylinder driving system in the prior art needs to be pumped into the lubrication position, which requires higher pumping speed.

Description

Technical Field

[0001] This utility model relates to the field of lubrication technology for mechanical structures, and in particular to a lubricating oil circulation cooling device for an electric cylinder drive system. Background Technology

[0002] To overcome the shortcomings of existing oilfield pumping units, which are bulky and energy-intensive, and to widely apply new technologies, it is necessary to redesign existing pumping units to achieve more efficient, energy-saving, and safer oil pumping operations. Electric cylinder pumping units are currently being vigorously promoted as an energy-saving, environmentally friendly, and efficient oil pumping method; improving electric cylinder pumping units can greatly assist in oil extraction.

[0003] For example, Chinese invention patent application CN113007060A discloses an electric cylinder drive device and a beam pumping unit containing the drive device. The electric cylinder drive device includes a motor, a ball screw driven by the motor, and nested inner and outer tubes. The motor is fixedly mounted on the outer tube, the ball screw is fixedly mounted on the output shaft of the motor, and the nut of the ball screw is fixedly mounted on the inner tube. When the motor rotates, it can drive the inner and outer tubes to move relative to each other, thereby changing the length of the inner and outer tubes, which facilitates the movement of the beam pumping unit.

[0004] In the above technical solution, the bearing requiring lubrication is located at the bottom of the oil sump. During use, lubricating oil needs to be pumped to the bearing at the top. The lubricating oil then flows down naturally and is recycled back into the oil sump by a recovery system for the next lubrication cycle. However, in this solution, the oil sump is far from the part requiring lubrication, necessitating pumping to the location. The pumping speed is related to the leakage rate at the lubrication point, and controlling the pumping speed at different rotational speeds is difficult. Utility Model Content

[0005] In view of this, the present invention provides a lubricating oil circulation cooling device for an electric cylinder drive system, which solves the problem in the prior art that the lubricating oil in the electric cylinder drive system needs to be pumped to the lubrication position, resulting in a high requirement for pumping speed.

[0006] A circulating cooling device for lubricating oil in an electric cylinder drive system includes an oil sump consisting of a shaft mounted in a bearing, a bearing housing, a housing fixedly connected to the bearing housing, and a sealing seat on the bearing housing. The bearing to be lubricated is immersed in the oil sump. The bottom of the oil sump is also provided with an oil storage structure for receiving lubricating oil leaking from the oil sump. The bottom of the oil sump and the oil storage structure are respectively provided with oil drain ports for lubricating oil to pass through. The circulating cooling device also includes an oil pump for pumping lubricating oil. The inlet of the oil pump is connected to two oil drain ports through an input oil pipe, and the outlet of the oil pump is connected to the oil sump through an output oil pipe. A cooler for cooling the lubricating oil is also provided on the input oil pipe and / or the output oil pipe.

[0007] Furthermore, the input oil pipe includes an input main pipe and an input branch pipe, and an oil drain connector is provided on the oil drain port; the oil drain connector is provided with an input branch pipe, the inlet of the oil pump is connected to the input main pipe, and the input branch pipe and the input main pipe are connected by a tee connector.

[0008] Furthermore, the sealing seat is disposed at the bottom of the bearing housing, and the oil drain port includes a first oil drain port disposed on the bearing housing and a second oil drain port disposed on the oil storage structure.

[0009] Furthermore, the circulating cooling device also includes a filter located upstream of the oil pump to filter the lubricating oil in the circulation.

[0010] Furthermore, a filter is installed on the input main pipe between the tee joint and the oil pump, and the cooler is installed on the output oil pipe.

[0011] Furthermore, the oil storage structure includes an oil slinger located at the bottom of the sealing seat and fixedly mounted on the shaft, and an oil receiving plate fixedly mounted on the sealing seat, wherein the oil receiving plate is provided with an annular cavity for receiving lubricating oil.

[0012] The beneficial effects of the lubricating oil circulation cooling device for the electric cylinder drive system in this utility model are as follows: This utility model includes an oil sump consisting of a shaft installed in the bearing, a bearing housing, a housing fixedly connected to the bearing housing, and a sealing seat on the bearing housing. This allows the bearing to be immersed in the oil sump, facilitating direct lubrication of the bearing to be lubricated. At this time, the lubricating oil in the oil sump is in direct contact with the bearing to be lubricated, and the lubricating oil can continuously lubricate the bearing. Furthermore, since the oil sump is in direct contact with the bearing, the heat generated by the bearing during operation can also be directly carried away by the lubricating oil in the oil sump. As the usage time increases, the heat in the oil sump will inevitably increase, causing the temperature of the lubricating oil to rise. Therefore, a cooler is also provided to cool down the lubricating oil. Through the action of the drain joint and the oil pump, the lubricating oil is continuously circulated. During the circulation process, the cooler cools down the oil, ultimately providing continuous lubrication and cooling for the bearing. This solves the problem in the prior art where the lubricating oil in the electric cylinder drive system needs to be pumped to the lubrication position, resulting in high requirements for pumping speed. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the electric cylinder drive system in this utility model; Figure 2 This is a schematic diagram of an embodiment of the lubricating oil circulation cooling device for the electric cylinder drive system of this utility model; Figure 3 This is a schematic diagram of the lubricating oil flow path of an embodiment of the lubricating oil circulation cooling device for the electric cylinder drive system of this utility model.

[0015] The labels in the diagram represent the following: 11. Motor; 12. Coupling; 13. Bearing housing; 14. Electric cylinder swing seat; 15. Electric cylinder inner sleeve; 16. Electric cylinder outer sleeve; 17. Bearing; 18. Lead screw; 19. Lead screw nut; 2. Oil sump; 31. Sealing seat; 32. Oil slinger; 33. Oil receiving pan; 34. First oil drain connector; 35. Second oil drain connector; 41. Oil pump; 42. Filter; 43. Cooler; 51. First input branch pipe; 52. Second input branch pipe; 53. Input main pipe; 54. Output oil pipe; 55. T-connector. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the present utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present utility model.

[0017] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0018] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms and should not be construed as indicating or implying relative importance. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0019] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0021] In the following description, the use of suffixes such as "module," "part," or "unit" to denote elements is solely for the purpose of illustrating this invention and has no specific meaning in itself. Therefore, "module" and "part" can be used interchangeably.

[0022] To better understand the technical solution of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings.

[0023] In Embodiment 1 of the electric cylinder drive system lubricating oil circulation cooling device (hereinafter referred to as the circulation cooling device) of this utility model: In this invention, a circulating cooling device is installed in the electric cylinder drive system to lubricate and cool the bearings and lead screw structure within the system. Specifically, for example... Figure 1 As shown, the electric cylinder drive system includes a motor 11 located at the bottom and a housing outside the motor 11. The housing includes a large-diameter electric cylinder swing frame at the bottom and an outer tube of the electric cylinder located at the top of the swing frame and fixedly connected to it. A bearing seat 13 for mounting a bearing 17 is fixedly installed on the outer tube. A shaft fixedly connected to the output shaft of the motor 11 is installed in the bearing seat 13 via the bearing 17. In this embodiment, the shaft is a lead screw 18, which moves in conjunction with a lead screw nut 19. The lead screw nut 19 is fixedly installed on the inner tube of the electric cylinder. When the motor 11 rotates, the motor 11 drives the lead screw 18 to rotate through the coupling 12. Due to the fixation of the bearing 17, the lead screw 18 can only rotate and cannot move up and down. The lead screw nut 19 can make linear motion in the up and down direction under the drive of the lead screw 18. Since the lead screw nut 19 is fixedly connected to the inner tube of the electric cylinder, the inner tube and the outer tube of the electric cylinder can move relative to each other, thereby driving other components to move. During the operation of the electric cylinder drive system, the bearing 17 must rotate, thus requiring lubrication. Therefore, a lubricating oil is also provided for lubricating the bearing 17.

[0024] Specifically, such as Figure 2 As shown, this embodiment includes an oil bath 2 consisting of a shaft installed in the bearing 17, a bearing housing 13, a housing fixedly connected to the bearing housing 13, and a sealing seat 31 on the bearing housing 13. The bearing 17 to be lubricated and the lead screw nut 19 are directly immersed in the oil bath 2. At this time, the lubricating oil in the oil bath 2 can directly contact the bearing 17 and the lead screw nut 19, facilitating direct supply of lubricating oil to the bearing 17 for lubrication. It also facilitates the absorption of heat generated by the bearing 17 during operation into the lubricating oil, thus cooling the bearing 17 and extending its service life.

[0025] The sealing seat 31 is fixedly installed at the bottom of the bearing housing 13, including a base fixedly connected to the bearing housing 13. A skeleton seal is provided between the base and the shaft, and a PTFE oil retainer ring is provided above the skeleton seal. This arrangement helps to retain lubricating oil in the oil sump 2. The sealing seat 31 plays a sealing role during contact with the shaft. As the usage time increases, its wear intensifies, and oil leakage inevitably occurs. Therefore, an oil storage structure is also provided at the bottom of the oil sump 2 to receive lubricating oil leaking from the bearing 17. Specifically, the oil storage structure includes an oil slinger 32 located at the bottom of the sealing seat 31 and fixedly mounted on the shaft, and an oil receiving pan 33 fixedly mounted on the sealing seat 31. The oil receiving pan 33 has an annular cavity for receiving lubricating oil. The sealing seat 31 minimizes oil leakage, and for any actual leakage, the oil slinger 32 concentrates the lubricating oil into the annular cavity of the oil receiving pan 33. In actual use, the lubricating oil is mainly concentrated in the oil sump 2 and the oil receiving pan 33.

[0026] like Figure 2 and Figure 3 As shown, to facilitate the circulation of lubricating oil, the oil drain port includes a first oil drain port on the bearing housing 13 and a second oil drain port on the oil storage structure, specifically the second oil drain port is located on the oil receiving tray 33. A first oil drain connector 34 is provided on the first oil drain port, and a second oil drain connector 35 is provided on the second oil drain port. The oil drain connectors allow the lubricating oil in the oil sump 2 and the oil storage structure to flow out. To provide power for the oil movement, the circulating cooling device also includes an oil pump 41. A first input branch pipe 51 is connected to the first oil drain connector 34, and a second input branch pipe 52 is connected to the second oil drain connector 35. The first input branch pipe 51 and the second input branch pipe 52 are connected to the input main pipe 53 through a tee connector 55. The input main pipe 53 is then connected to the oil pump 41, enabling the oil sump 2 and the oil storage structure to supply oil to the oil pump 41. The outlet of the oil pump 41 is also connected to an output oil pipe 54, which is connected to the oil sump 2. It is worth noting that although the drain connector allows lubricating oil to flow down, it is necessary to maintain a certain level of lubricating oil in the oil sump 2 at all times. Specifically, the drain connector can be a one-way valve or a drain connector with an internal hexagonal pin and a built-in spring. Of course, it can also be other drain connectors that can meet the function of retaining a certain amount of lubricating oil. Alternatively, a pilot valve or other structure can be set in the oil circuit to control the oil circuit opening and closing. Alternatively, in other embodiments, if the oil pump 41 is a multi-inlet oil pump 41, the three-way connector 55 can be omitted, and the first input branch pipe 51 and the second input branch pipe 52 can be directly connected to the oil pump 41.

[0027] Iron filings may be generated during the operation of the shaft system components. These iron filings mixed in the oil can accelerate wear on the shaft system components. Therefore, a filter 42 is provided to filter iron filings and other impurities. Specifically, the filter 42 is installed on the inlet manifold 53, filtering impurities within it. This not only filters impurities but also protects the oil pump 41 by being positioned before it. To cool the lubricating oil, a cooler 43 is installed on the outlet manifold, facilitating cooling and ensuring the lubricating oil in the oil sump 2 remains at a low temperature and is pure. Alternatively, in other embodiments, the position of the cooler can be changed, such as placing it before the oil pump. Of course, as in this application, placing the cooler after the oil pump also dissipates the heat generated by the pump, further lowering the oil temperature.

[0028] When the electric cylinder drive system is working, the bearing 17 is rotating. Since the bearing 17 is immersed in the oil sump 2, the lubricating oil can lubricate and cool the bearing 17. Afterwards, the lubricating oil in the oil sump 2 is supplied to the oil pump 41 through the first input branch pipe 51 and the lubricating oil in the oil storage structure through the second input branch pipe 52. After passing through the cooler 43 and filter 42 in the oil circuit, the lubricating oil is cooled and cooled down. Finally, it is pumped back to the oil sump 2 by the oil pump 41 for the next cycle.

[0029] It should be understood that the described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A lubricating oil circulation cooling device for an electric cylinder drive system, characterized in that: The device includes an oil sump consisting of a shaft installed in the bearing, a bearing housing, a housing fixedly connected to the bearing housing, and a sealing seat on the bearing housing. The bearing to be lubricated is immersed in the oil sump. The bottom of the oil sump is also provided with an oil storage structure for receiving lubricating oil leaking from the oil sump. The bottom of the oil sump and the oil storage structure are respectively provided with oil drain ports for lubricating oil to pass through. The circulating cooling device also includes an oil pump for pumping lubricating oil. The inlet of the oil pump is connected to two oil drain ports through an input oil pipe, and the outlet of the oil pump is connected to the oil sump through an output oil pipe. A cooler for cooling the lubricating oil is also provided on the input oil pipe and / or the output oil pipe.

2. The lubricating oil circulation cooling device for an electric cylinder drive system according to claim 1, characterized in that: The input oil pipe includes an input main pipe and an input branch pipe, and an oil drain connector is provided on the oil drain port; the oil drain connector is provided with an input branch pipe, the inlet of the oil pump is connected to the input main pipe, and the input branch pipe and the input main pipe are connected by a T-connector.

3. The lubricating oil circulation cooling device for an electric cylinder drive system according to claim 2, characterized in that: The sealing seat is located at the bottom of the bearing housing, and the oil drain port includes a first oil drain port located on the bearing housing and a second oil drain port located on the oil storage structure.

4. The lubricating oil circulation cooling device for an electric cylinder drive system according to any one of claims 1-3, characterized in that: The circulating cooling system also includes a filter located upstream of the oil pump to filter the lubricating oil in the circulation.

5. The lubricating oil circulation cooling device for an electric cylinder drive system according to claim 2, characterized in that: A filter is installed on the input main pipe between the tee joint and the oil pump, and the cooler is installed on the output oil pipe.

6. The lubricating oil circulation cooling device for an electric cylinder drive system according to claim 3, characterized in that: The oil storage structure includes an oil slinger located at the bottom of the sealing seat and fixedly mounted on the shaft, and an oil receiving plate fixedly mounted on the sealing seat. The oil receiving plate is provided with an annular cavity for receiving lubricating oil.

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