Oil return device for small oil groove of industrial sewing machine

By adding oil return pipe 2 and installing oil pumping components in the small oil tank return device of the industrial sewing machine, the negative pressure reflow technology is used to solve the problem of oil throwing phenomenon of the sewing machine, and the stable return of oil in the small oil tank is achieved, avoiding overflow and pollution, and improving the quality of equipment and products.

CN222961728UActive Publication Date: 2025-06-10黄东申
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Patent Information

Application Number
CN202422166454.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-04
Publication Date
2025-06-10
Estimated Expiration
2034-09-04

AI Technical Summary

Technical Problem

The existing industrial sewing machines have oil fluttering in the shuttle design, which causes lubricating oil in the small oil tank to overflow, affect the lubricating effect of equipment and product quality, and may lead to increased operating risks for workers.

Method used

Design a small oil tank oil return device for industrial sewing machines, including a sewing machine oil pump, oil pump assembly and oil return connection. By adding a second oil return connection on the oil return connection and installing an oil pump assembly, the oil in the small oil tank is reflowed by negative pressure reflux technology to prevent oil from overflowing.

Benefits of technology

It effectively avoids oil overflow in small oil tanks, maintains the stable state of oil, prevents pollution of products and equipment, and improves maintenance convenience.

✦ Generated by Eureka AI based on patent content.

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    Figure CN222961728U_ABST
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Abstract

The utility model provides an industrial sewing machine small oil groove oil return device which comprises a sewing machine oil pump and an oil pumping assembly, a first oil return connecting pipe is arranged on the upper side of the sewing machine oil pump, and the upper end of the first oil return connecting pipe is fixedly connected with an external sewing machine oil return pipe. An oil return connecting pipe I is arranged on the oil return connecting pipe I, an oil pumping assembly is arranged on the oil return connecting pipe I, and a second oil return connecting pipe is vertically arranged on the side, close to the oil pump of the sewing machine, of one side wall of the oil return connecting pipe. When negative pressure is generated in the first oil return connecting pipe to return oil in the oil return pipe of the sewing machine, the interior of the second oil return connecting pipe is in a negative pressure state, oil thrown out by an oil shuttle in the small oil groove flows back through the oil pumping assembly, then the oil in the small oil groove is prevented from being continuously accumulated and overflowing, the state that the small oil groove has extremely little oil is kept all the time, and the service life of the sewing machine is prolonged. And oil in the small oil tank is prevented from overflowing to pollute products and equipment.
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Description

Technical Field

[0001] The utility model belongs to the technical field of industrial sewing machine equipment, and particularly relates to an oil return device for a small oil tank of an industrial sewing machine. Background Art

[0002] The problem existing in the existing industrial sewing machine in the design of the rotating hook is the oil throwing phenomenon, which will cause the lubricating oil in the small oil tank to overflow. This phenomenon first affects the lubrication effect of the equipment. Excessive lubricating oil will not only cause the accumulation of oil stains on the surface of machine parts, but also lead to the pollution of sewing products, affecting product quality. Secondly, after the lubricating oil overflows, it may form a slippery oil layer in the working environment, increasing the risk of worker operation and leading to accidents.

[0003] These disadvantages mainly stem from the working mechanism of the rotating hook. Its high-speed rotation generates centrifugal force, causing the lubricating oil to be thrown out of the oil tank. To address this problem, traditional methods include adjusting the capacity of the oil tank, adding an oil pump to enhance oil circulation, and designing a deeper oil tank to accommodate the excess oil. However, these methods do not fundamentally solve the problem. Adjusting the oil tank capacity may not meet the lubrication requirements under different operating conditions, and adding an oil pump increases the complexity and maintenance cost of the equipment, which may lead to an increase in the failure rate. Therefore, we hope to design an oil return device for a small oil tank of a sewing machine with a new structure to solve this problem. Summary of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide an oil return device for a small oil tank of an industrial sewing machine to solve the problems raised in the above background art.

[0005] The utility model is realized through the following technical solutions: an oil return device for a small oil tank of an industrial sewing machine, comprising: a sewing machine oil pump and an oil pumping component. A first oil return pipe is arranged on the upper side of the sewing machine oil pump, and the upper end of the first oil return pipe is fixedly connected with an external sewing machine oil return pipe;

[0006] A second oil return pipe is vertically arranged on a side wall of the first oil return pipe close to the sewing machine oil pump. The sewing machine oil pump is fixedly connected with the oil pumping component through the second oil return pipe;

[0007] The oil pumping component includes a threaded cap, a flexible circular pipe, a connecting part, a pressing part and a port part. A threaded cap is arranged at one end of the flexible circular pipe close to the second oil return pipe;

[0008] The end of the flexible circular pipe is threadedly connected with the connecting part. The lower end of the connecting part is threadedly connected with the pressing part, and the lower end of the pressing part is threadedly connected with the port part.

[0009] As a preferred embodiment, the connecting portion includes a first threaded pipe and an installation cylinder. The upper end of the installation cylinder is integrally provided with the first threaded pipe, and the upper end of the first threaded pipe is threadedly connected to the end of the flexible circular pipe.

[0010] The inner cavity is arranged inside the lower end of the installation cylinder, and the inner wall of the inner cavity is provided with a first internal thread. In actual use, the connecting portion and the pressing portion are both made of plastic materials, while the port portion is made of metal materials. This makes the lower end of the entire oil pumping assembly heavier and not prone to tipping over. This also enables the port portion to be vertical inside the small oil tank of the sewing machine, ensuring its stable oil return.

[0011] As a preferred embodiment, the pressing portion includes a clamping cylinder, a second threaded pipe, a third threaded pipe, and a first filter screen. The diameter and inner diameter of the clamping cylinder are both matched with the diameter and inner diameter of the installation cylinder. The upper end of the clamping cylinder is integrally provided with the third threaded pipe.

[0012] The upper end of the clamping cylinder is threadedly connected to the installation cylinder through the third threaded pipe, the first internal thread, and the inner cavity.

[0013] As a preferred embodiment, the lower end of the clamping cylinder is integrally provided with the second threaded pipe, and the lower end of the second threaded pipe is fixed with the first filter screen. The inner diameters of the second threaded pipe and the third threaded pipe are both matched with the inner diameter of the clamping cylinder.

[0014] As a preferred embodiment, the port portion includes an end cap and a second filter screen. An inner cavity two is arranged inside the upper end of the end cap, and the inner wall of the inner cavity two is provided with a second internal thread. The upper end of the end cap is threadedly connected to the second threaded pipe through the inner cavity two and the second internal thread. The functions of the first filter screen and the second filter screen are to limit and extrude the filter cotton mass, thereby reducing the volume and ensuring that the entire port portion can stably contact the bottom of the small oil tank.

[0015] As a preferred embodiment, the oil pumping assembly further includes a filter cotton mass. The filter cotton mass is placed inside the end cap, and the lower end of the filter cotton mass abuts against the upper side of the second filter screen, and the upper end of the filter cotton mass abuts against the lower side of the first filter screen.

[0016] After adopting the above technical solution, the beneficial effect of the present utility model is that by adding a second oil return pipe to the first oil return pipe of the sewing machine oil pump and configuring an oil pumping assembly, when a negative pressure is generated inside the first oil return pipe to return the oil liquid inside the sewing machine oil return pipe, it will also make the inside of the second oil return pipe in a negative pressure state, and the oil pumped out by the oil shuttle in the small oil tank is returned through the oil pumping assembly, thereby avoiding the continuous accumulation and overflow of the oil liquid in the small oil tank, keeping it in a state with very little oil liquid all the time, and avoiding the oil liquid in the small oil tank from overflowing and polluting the products and equipment.

[0017] The connection part, the pressing part and the port part are arranged, and the connection part, the pressing part and the port part are connected to each other by threads. In the subsequent use by users, the users can open the connection part, the pressing part and the port part by screwing, which greatly improves the convenience of subsequent maintenance, facilitates the cleaning and replacement of the filter cotton mass, and improves the convenience of use of the whole oil pumping assembly. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the overall structure of an oil return device for a small oil sump of an industrial sewing machine according to the present invention.

[0020] Figure 2 It is a schematic diagram of the connection structure of the connection part, the pressing part and the port part of an oil return device for a small oil sump of an industrial sewing machine according to the present invention.

[0021] Figure 3 It is a schematic diagram of the pressing part structure of an oil return device for a small oil sump of an industrial sewing machine according to the present invention.

[0022] In the figure, 100 - sewing machine oil pump, 110 - first oil return pipe, 120 - second oil return pipe;

[0023] 200 - oil pumping assembly, 210 - threaded cap, 220 - flexible round tube, 230 - connection part, 231 - first inner cavity, 232 - first threaded pipe, 233 - mounting cylinder, 240 - pressing part, 241 - first filter screen, 242 - second threaded pipe, 243 - clamping cylinder, 244 - third threaded pipe, 250 - port part, 251 - end cover, 252 - second filter screen, 253 - second inner cavity, 260 - filter cotton mass. Detailed Embodiment

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0025] Please refer to Figures 1 to 3, the present utility model provides a technical solution: an oil return device for a small oil tank of an industrial sewing machine, including: a sewing machine oil pump 100, an oil pumping assembly 200. An oil return connection pipe one 110 is arranged on the upper side of the sewing machine oil pump 100, and the upper end of the oil return connection pipe one 110 is fixedly connected to the external sewing machine oil return pipe;

[0026] On the side wall of the oil return connection pipe one 110 close to the sewing machine oil pump 100, an oil return connection pipe two 120 is vertically arranged, and the sewing machine oil pump 100 is fixedly connected to the oil pumping assembly 200 through the oil return connection pipe two 120;

[0027] The oil pumping assembly 200 includes a threaded cap 210, a flexible circular tube 220, a connecting part 230, a pressing part 240 and a port part 250. A threaded cap 210 is arranged at one end of the flexible circular tube 220 close to the oil return connection pipe two 120;

[0028] The end of the flexible circular tube 220 is threadedly connected to the connecting part 230, the lower end of the connecting part 230 is threadedly connected to the pressing part 240, and the lower end of the pressing part 240 is threadedly connected to the port part 250.

[0029] As the first embodiment of the present utility model, by adding an oil return connection pipe two 120 to the oil return connection pipe one 110 of the sewing machine oil pump 100 (the structure and working principle of the sewing machine oil pump 100 are the same as those of the computer sewing machine oil pump 100 on the existing market), and configuring the oil pumping assembly 200. In actual use, after the sewing machine oil pump 100 is installed, the sewing machine oil return pipe is connected to the oil return connection pipe one 110, then the flexible circular tube 220 is fixedly connected to the oil return connection pipe two 120 through the threaded cap 210, and the whole formed by the connecting part 230, the pressing part 240 and the port part 250 at the end of the oil pumping assembly 200 is placed in the small oil tank of the sewing machine. The inside of the oil return connection pipe two 120 and the oil return connection pipe one 110 is a communicating structure. When a negative pressure is generated inside the oil return connection pipe one 110 to return the oil in the sewing machine oil return pipe, it will also make the inside of the oil return connection pipe two 120 in a negative pressure state, and the oil thrown out by the oil shuttle in the small oil tank is returned through the oil pumping assembly 200, thereby avoiding the continuous accumulation and overflow of the oil in the small oil tank, making it always maintain a state with very little oil, and avoiding the oil in the small oil tank from overflowing and polluting the products and equipment.

[0030] Please refer to Figures 1 to 3 , the connecting part 230 includes a threaded pipe one 232 and an installation cylinder 233. The threaded pipe one 232 is integrally arranged at the upper end of the installation cylinder 233, and the upper end of the threaded pipe one 232 is threadedly connected to the end of the flexible circular tube 220;

[0031] There is an inner cavity inside the lower end of the installation cylinder 233, and a first internal thread is provided on the inner wall of the inner cavity. In actual use, both the connection part 230 and the pressing part 240 are made of plastic material, while the port part 250 is made of metal material. This makes the lower end of the entire oil pumping assembly 200 heavier and not prone to tipping over, which also enables the port part 250 to be vertical inside the small oil tank of the sewing machine, ensuring stable oil return.

[0032] The pressing part 240 includes a clamping cylinder 243, a second threaded pipe 242, a third threaded pipe 244, and a first filter screen 241. The diameter and inner diameter of the clamping cylinder 243 are both matched with the diameter and inner diameter of the installation cylinder 233. A third threaded pipe 244 is integrally provided at the upper end of the clamping cylinder 243;

[0033] The upper end of the clamping cylinder 243 is threadedly connected to the installation cylinder 233 through the third threaded pipe 244, the first internal thread, and the inner cavity.

[0034] A second threaded pipe 242 is integrally provided at the lower end of the clamping cylinder 243, and a first filter screen 241 is fixed at the lower end of the second threaded pipe 242. The inner diameters of the second threaded pipe 242 and the third threaded pipe 244 are both matched with the inner diameter of the clamping cylinder 243.

[0035] The port part 250 includes an end cover 251 and a second filter screen 252. There is a second inner cavity 253 inside the upper end of the end cover 251, and a second internal thread is provided on the inner wall of the second inner cavity 253. The upper end of the end cover 251 is threadedly connected to the second threaded pipe 242 through the second inner cavity 253 and the second internal thread. The functions of the first filter screen 241 and the second filter screen 252 are to limit and extrude the filter cotton mass 260, thereby reducing its volume and ensuring that the entire port part 250 can stably contact the bottom of the small oil tank.

[0036] The oil pumping assembly 200 further includes a filter cotton mass 260. The filter cotton mass 260 is placed inside the end cover 251, and the lower end of the filter cotton mass 260 abuts against the upper side of the second filter screen 252, and the upper end of the filter cotton mass 260 abuts against the lower side of the first filter screen 241.

[0037] As the second embodiment of the present invention, based on the above first embodiment, in actual use, since the filter cotton mass 260 is fixed between the pressing part 240 and the port part 250 through the first filter screen 241 and the second filter screen 252, the filtering effect of the oil liquid in the small oil tank is greatly improved, avoiding the sewing machine oil pump 100 and other lubricating components from being contaminated and damaged due to more impurities in the reflux oil liquid. At the same time, the connection part 230, the pressing part 240, and the port part 250 are threadedly connected to each other. In subsequent use, the user can open the connection part 230, the pressing part 240, and the port part 250 by screwing, which greatly improves the convenience of subsequent maintenance, facilitates the cleaning and replacement of the filter cotton mass 260, and improves the use convenience of the entire oil pumping assembly 200.

[0038] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An oil return device for a small oil tank of an industrial sewing machine, comprising: A sewing machine oil pump (100) and an oil pumping assembly (200), characterized in that an oil return pipe (110) is provided on the upper side of the sewing machine oil pump (100), and the upper end of the oil return pipe (110) is fixedly connected to an external sewing machine oil return pipe; A second oil return pipe (120) is vertically arranged on a side wall of the first oil return pipe (110) close to the sewing machine oil pump (100), and the sewing machine oil pump (100) is fixedly connected to the oil pumping assembly (200) via the second oil return pipe (120); The oil pumping assembly (200) comprises a threaded cap (210), a flexible round tube (220), a connecting portion (230), a pressing portion (240) and a port portion (250); a threaded cap (210) is provided at one end of the flexible round tube (220) close to the second oil return pipe (120); The end of the flexible circular tube (220) is threadedly connected to the connecting portion (230), the lower end of the connecting portion (230) is threadedly connected to a pressing portion (240), and the lower end of the pressing portion (240) is threadedly connected to a port portion (250).

2. The small oil tank oil return device for an industrial sewing machine as claimed in claim 1, characterized in that: The connecting portion (230) comprises a threaded tube (232) and a mounting tube (233); the upper end of the mounting tube (233) is integrally provided with the threaded tube (232); the upper end of the threaded tube (232) is threadedly connected to the end of the flexible circular tube (220); An inner cavity is provided inside the lower end of the installation cylinder (233), and an inner wall of the inner cavity is provided with an internal thread.

3. The small oil tank oil return device for an industrial sewing machine as claimed in claim 2, characterized in that: The pressing portion (240) comprises a clamping tube (243), a second threaded tube (242), a third threaded tube (244) and a first filter screen (241); the diameter and inner diameter of the clamping tube (243) match the diameter and inner diameter of the mounting tube (233); and the upper end of the clamping tube (243) is integrally provided with a third threaded tube (244); The upper end of the clamping cylinder (243) is threadedly connected to the installation cylinder (233) via a threaded tube three (244), an internal thread one, and an inner cavity.

4. The small oil tank oil return device for an industrial sewing machine as claimed in claim 3, characterized in that: The lower end of the clamping tube (243) is integrally provided with a second threaded tube (242), the lower end of the second threaded tube (242) is fixed with a filter screen (241), and the inner diameters of the second threaded tube (242) and the third threaded tube (244) both match the inner diameter of the clamping tube (243).

5. The small oil tank oil return device for an industrial sewing machine as claimed in claim 4, characterized in that: The port portion (250) comprises an end cover (251) and a second filter screen (252); a second inner cavity (253) is provided inside the upper end of the end cover (251); an inner wall of the second inner cavity (253) is provided with a second internal thread; the upper end of the end cover (251) is threadedly connected to the second threaded pipe (242) via the second inner cavity (253) and the second internal thread.

6. The small oil tank oil return device for an industrial sewing machine as claimed in claim 1, characterized in that: The oil extraction assembly (200) further comprises a filter cotton ball (260), the filter cotton ball (260) being placed inside the end cover (251), and the lower end of the filter cotton ball (260) being in contact with the upper side of the second filter screen (252), and the upper end of the filter cotton ball (260) being in contact with the lower side of the first filter screen (241).