Roots screw vacuum system with easy oil change
Patent Information
- Application Number
- CN202522497068.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-25
- Publication Date
- 2026-09-29
- Estimated Expiration
- 2035-11-25
AI Technical Summary
现行罗茨泵普遍采用定期更换润滑油的方式进行维护，但传统换油方式存在显著弊端：首先，操作流程繁琐，需停机冷却后手动拧开注油塞和放油塞，依靠重力排油再行加注，效率低下且影响生产连续性，其次，操作安全性差，在系统未完全泄压或冷却时开启油塞，存在高温润滑油喷溅伤人的风险，再次，油位控制不精确，依赖人工观察油窗，易因油位过高导致润滑油窜入泵腔，或因油位过低导致润滑不足而损坏轴承、齿轮，最后，开放式操作易引入空气中的水分和杂质，污染润滑系统，影响真空度并缩短泵体寿命
[0013]本实用新型极致便捷，无需任何外部工具或设备，从新油注入到废油储存，全过程高度封闭，杜绝污染，具备数据记录和显示功能，便于实现预测性维护。
Smart Images
Figure CN224813993U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of Roots screw vacuum systems, specifically relating to a Roots screw vacuum system that facilitates lubrication oil replacement. Background Technology
[0002] As a key piece of equipment in the medium vacuum field, the reliable lubrication of the bearings and gears of the Roots vacuum pump is crucial for ensuring long-term stable operation. Currently, Roots pumps are generally maintained by periodically changing the lubricating oil. However, this traditional method has significant drawbacks: First, the operation is cumbersome, requiring manual unscrewing of the filler and drain plugs after the pump has cooled down, relying on gravity to drain the oil before refilling, which is inefficient and affects production continuity. Second, operational safety is poor; opening the oil plug before the system is fully depressurized or cooled poses a risk of injury from hot lubricating oil splashing. Third, oil level control is inaccurate, relying on manual observation of the oil window, which can easily lead to lubricating oil entering the pump chamber due to excessively high levels, or insufficient lubrication due to excessively low levels, damaging the bearings and gears. Finally, open operation easily introduces moisture and impurities from the air, contaminating the lubrication system, affecting vacuum levels, and shortening the pump's lifespan.
[0003] Therefore, it is urgent to develop a Roots screw vacuum system that can achieve safe, fast, accurate and clean oil changes. Utility Model Content
[0004] To achieve the above objectives, this utility model provides the following technical solution: a Roots screw vacuum system that facilitates lubrication oil replacement, comprising a Roots pump body, a drive motor, and a vacuum unit consisting of a back pump. The Roots pump body is provided with a rotor driven by bearings and gears and an oil chamber for lubrication. The system also includes a quick oil change device and an oil level monitoring device integrated on the Roots pump body.
[0005] The quick oil change device includes an integrated oil circuit module, which has a main oil chamber, an oil inlet channel communicating with the main oil chamber, and an oil outlet channel communicating with the oil chamber. The end of the oil inlet channel is connected to a quick oil inlet interface, which is connected to the oil chamber. The outlet end of the oil outlet channel is connected to a quick oil outlet interface, which is connected to the oil chamber.
[0006] The oil level monitoring device includes a level sensor installed in the oil chamber for real-time detection of the oil level and a controller installed in the integrated oil circuit module.
[0007] As a preferred embodiment of the Roots screw vacuum system of this utility model for easy replacement of lubricating oil, the oil discharge channel is equipped with a built-in oil discharge pump, the oil inlet channel is equipped with a built-in oil inlet pump, and the controller is signal-connected to the liquid level sensor, the built-in oil inlet pump, and the built-in oil discharge pump.
[0008] As a preferred embodiment of the Roots screw vacuum system of this utility model that facilitates lubrication oil replacement, the integrated oil circuit module is also equipped with an air filter. The system is equipped with a dual-way reversing valve, which has a first position and a second position. When in the first position, the lubricating oil circulates between the oil chamber of the Roots pump body and the main oil chamber. When in the second position, the main oil chamber is connected to the air filter.
[0009] As a preferred embodiment of the Roots screw vacuum system of this utility model that facilitates lubrication oil replacement, the quick oil inlet and quick oil outlet are leak-proof quick self-sealing connectors.
[0010] As a preferred embodiment of the Roots screw vacuum system of this utility model that facilitates lubrication oil replacement, the controller has a pre-stored standard oil level threshold and can receive feedback signals from the liquid level sensor. By controlling the opening and closing of the dual-way reversing valve, the oil level in the oil chamber is maintained at the standard oil level threshold.
[0011] As a preferred embodiment of the Roots screw vacuum system of this utility model that facilitates lubrication oil replacement, the end of the oil drain channel is connected to a waste oil tank, which is installed in an integrated oil circuit module.
[0012] Compared with the prior art, the beneficial effects of this utility model are:
[0013] This invention is extremely convenient, requiring no external tools or equipment. From new oil injection to waste oil storage, the entire process is highly enclosed, eliminating pollution. It also features data recording and display functions, facilitating predictive maintenance. Attached Figure Description
[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:
[0015] Figure 1 This is a schematic diagram of the main structure of this utility model.
[0016] Figure 2 This is a side view cross-section structural diagram of the present invention.
[0017] In the diagram: 1. Roots pump body, 2. Drive motor, 3. Backing pump, 4. Integrated oil circuit module, 41. Main oil chamber, 42. Oil inlet channel, 43. Oil outlet channel, 44. Air filter, 45. Waste oil tank, 5. Quick oil inlet interface, 6. Quick oil outlet interface, 7. Built-in oil outlet pump, 8. Liquid level sensor, 9. Controller, 10. Dual-way directional valve, 11. Oil chamber, 12. Built-in oil inlet pump. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0019] This utility model relates to a Roots screw vacuum system that facilitates lubrication oil replacement, such as... Figure 1-2 As shown, the system includes a Roots pump body 1, a drive motor 2, and a vacuum unit consisting of a backing pump 3. The Roots pump body 1 has a rotor driven by bearings and gears and an oil chamber 11 for lubrication. The system is characterized by the following: the system also includes a quick oil change device and an oil level monitoring device integrated on the Roots pump body 1. The quick oil change device includes an integrated oil circuit module 4, which has a main oil chamber 41, an oil inlet channel 42 communicating with the main oil chamber 41, and an oil outlet channel 43 communicating with the oil chamber 11. The end of the oil inlet channel 42 is connected to a quick oil inlet interface 5, which is connected to the oil chamber 11. The outlet end of the oil outlet channel 43 is connected to a quick oil outlet interface 6, which is connected to the oil chamber 11. The oil level monitoring device includes a level sensor 8 installed in the oil chamber 11 for real-time oil level detection and a controller 9 installed in the integrated oil circuit module 4.
[0020] The workflow of this utility model is as follows: During normal operation, the system is powered on, and the dual-way reversing valve 10 is de-energized and in the first position. During oil change, the operator performs the oil change operation via the oil change button on the controller 9.
[0021] Step 1: Oil Drainage: First, the dual-way reversing valve 10 is energized and switched to the second position, the oil change position, so that the oil chamber 11 is balanced with the atmosphere. This design ensures that the oil can be discharged smoothly without forming a vacuum blockage. The air entering the main oil chamber is filtered by the air filter 44 to prevent impurities from contaminating it. Then, the built-in oil drain pump 7 is started and runs for a period of time. The pump generates suction force to pump all the waste lubricating oil in the system into the integrated waste oil tank 45 through the oil drain channel 43 for temporary storage. After the level sensor 8 detects that the oil level has dropped to the threshold and is maintained for a period of time, the controller 9 determines that the oil drainage is complete, and then stops the built-in oil drain pump 7 and closes the quick oil drain port 6.
[0022] Step 2: Oil injection: Switch to the first station, start the built-in oil pump 12, and new oil flows from the main oil chamber 41 into the oil inlet channel 42 and the quick oil inlet interface 5, and finally into the oil chamber 11.
[0023] Step 3: Closed-loop control: Real-time monitoring of the liquid level sensor 8 signal. When the oil level reaches the preset level, the oil inlet pump 12 is immediately stopped.
[0024] Step 4 Recovery: De-energize the dual-way reversing valve 10, switch back to the second position, discharge the gas in the oil chamber 11, balance the oil chamber 11 with the atmosphere, close the oil inlet port 5 and switch back to the first position.
[0025] For waste oil disposal, maintenance personnel can open the drain plug under the module every quarter to discharge and recycle the waste oil accumulated in the waste oil tank 45.
[0026] The advantages of this implementation method are its extreme convenience, requiring no external tools or equipment. From new oil injection to waste oil storage, the entire process is highly enclosed, eliminating pollution. It also has data recording and display functions, facilitating predictive maintenance.
[0027] Both the built-in inlet pump 12 and the built-in outlet pump 7 of this utility model are miniature stainless steel gear pumps driven by 24V DC, and are directly installed on the flow channel interface of the module via flanges. The dual-way reversing valve 10 is a two-position, three-position normally closed solenoid valve, and its valve body is directly screwed into the machined threaded hole of the module. The air filter 44 is a precision type with replaceable filter element and a filtration accuracy of 0.3μm, screwed on the inside of the module. The quick inlet port 5 and the quick outlet port 6 are quick self-sealing connectors made of brass with a nominal diameter of 1 / 2 inch, which are connected to the pipeline.
[0028] In the electrical integration section, the level sensor 8 is a magnetostrictive level sensor. Its probe is directly mounted on the side wall of the oil chamber 11 of the Roots pump body 1 via a G1 / 2 thread, providing a high-precision 4-20mA current signal. The controller 9 uses a small PLC with enough I / O points to control two pumps, one solenoid valve, and receive level signals. The PLC and a 4.3-inch touchscreen are integrated into a waterproof control box on the side of the module.
[0029] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A Roots screw vacuum system with easy-to-change lubricating oil, comprising a Roots pump body (1), a drive motor (2), and a vacuum unit consisting of a backing pump (3), wherein the Roots pump body (1) is provided with a rotor driven by bearings and gears and an oil chamber (11) for lubrication, characterized in that: The system also includes a quick oil change device and an oil level monitoring device integrated on the Roots pump body (1); The quick oil change device includes an integrated oil circuit module (4), which has a main oil chamber (41), an oil inlet channel (42) connected to the main oil chamber (41), and an oil outlet channel (43) connected to the oil chamber (11). The end of the oil inlet channel (42) is connected to a quick oil inlet interface (5), which is connected to the oil chamber (11). The outlet end of the oil outlet channel (43) is connected to a quick oil outlet interface (6), which is connected to the oil chamber (11). The oil level monitoring device includes a level sensor (8) installed in the oil chamber (11) for real-time detection of the oil level and a controller (9) installed in the integrated oil circuit module (4).
2. The Roots screw vacuum system with easy lubrication oil replacement according to claim 1, characterized in that: The drain channel (43) is equipped with a built-in drain pump (7), and the inlet channel (42) is equipped with a built-in inlet pump (12). The controller (9) is connected to the liquid level sensor (8), the built-in inlet pump (12) and the built-in drain pump (7).
3. A Roots screw vacuum system for easy lubrication oil replacement according to claim 2, characterized in that: The integrated oil circuit module (4) is also equipped with an air filter (44). The system is equipped with a dual-way reversing valve (10). The dual-way reversing valve (10) has a first position and a second position. When it is in the first position, the lubricating oil circulates between the oil chamber (11) of the Roots pump body (1) and the main oil chamber (41). When it is in the second position, the main oil chamber (41) is connected to the air filter (44).
4. A Roots screw vacuum system for easy lubrication oil replacement according to claim 3, characterized in that: The controller (9) is connected to the dual-way reversing valve (10) for controlling its station switching.
5. A Roots screw vacuum system for easy lubrication oil replacement according to claim 4, characterized in that: The quick oil inlet port (5) and quick oil outlet port (6) are leak-proof quick self-sealing connectors.
6. A Roots screw vacuum system for easy lubrication oil replacement according to claim 5, characterized in that: The controller (9) has a pre-stored standard oil level threshold and can receive feedback signals from the liquid level sensor (8). By controlling the start and stop of the dual-way reversing valve (10), the oil level in the oil chamber (11) is maintained at the standard oil level threshold.
7. A Roots screw vacuum system for easy lubrication oil replacement according to claim 6, characterized in that: The end of the oil drain channel (43) is connected to a waste oil tank (45), which is installed in the integrated oil circuit module (4).