Anti-splashing structure and roots vacuum pump

Abstract

The utility model relates to roots vacuum pump technical field discloses a kind of anti-splashing structure and roots vacuum pump.The anti-splashing structure is applied to roots vacuum pump, and it includes: partition, install in pump body, and between the air balance passage in pump body and the gear assembly in pump body;Oil baffle, set to the side of partition close to the gear assembly in pump body, and located above the gear assembly in pump body.The roots vacuum pump includes pump body and the anti-splashing structure in the first aspect, the pump body has first chamber and second chamber, gear assembly is set to first chamber, first chamber and second chamber are communicated by air balance passage, and the anti-splashing structure is installed in first chamber, and located between gear assembly and air balance passage.The utility model is through the above technical scheme, to solve the technical problem that the oil drop that the roots vacuum pump in relevant technology exists splashes easily flows reversely through air balance passage.

Description

Technical Field

[0001] This utility model relates to the field of Roots vacuum pump technology, and in particular to an anti-splash structure and a Roots vacuum pump. Background Technology

[0002] A Roots vacuum pump is a positive displacement vacuum pump whose core component is a pair of rotors rotating synchronously in opposite directions within the pump chamber. Extremely small gaps are maintained between these two rotors and between the rotors and the pump casing. Through high-speed rotation, gas is continuously pushed from the inlet to the outlet, thus achieving the pumping purpose. Roots vacuum pumps are widely used in metallurgy, chemical engineering, electronics, coating, and other industrial and scientific research fields due to their high pumping speed and efficiency in the medium vacuum range, and are one of the main pump types for achieving medium to high vacuum.

[0003] Currently, some Roots vacuum pumps have gas balance channels to balance the chamber pressure. However, this also makes it easy for splashed oil droplets to flow backward through the gas balance channel and enter the clean pump chamber of the Roots vacuum pump, resulting in waste of lubricating oil and affecting the service life of the Roots vacuum pump. Summary of the Invention

[0004] This application discloses an anti-splash structure and a Roots vacuum pump to solve the technical problem in related technologies where splashed oil droplets can easily flow backward through the gas balance channel in Roots vacuum pumps.

[0005] To solve the above problems, the present invention adopts the following technical solution: In a first aspect, this application discloses an anti-splash structure applied to a Roots vacuum pump, comprising: A partition plate is installed inside the pump body and is located between the air balance channel inside the pump body and the gear assembly inside the pump body. An oil baffle is located on the side of the partition plate near the gear assembly inside the pump body, and above the gear assembly inside the pump body.

[0006] In some designs, the anti-splash structure also includes an oil receiving assembly, which is located on top of the oil baffle corresponding to the oil filling port of the pump body. The oil receiving assembly is connected to the oil sump inside the pump body so that the lubricating oil added through the oil filling port enters the oil sump inside the pump body after passing through the oil receiving assembly.

[0007] In some designs, the oil receiving assembly includes a first connecting plate that is bent multiple times and forms an oil receiving space with the top of the oil baffle plate, which is open on one side and communicates with the oil sump inside the pump body through the opening.

[0008] In some designs, the oil receiving assembly includes multiple second connecting plates connected in sequence, forming an oil receiving space with the top of the oil baffle plate, which is open on one side and communicates with the oil sump inside the pump body through the opening.

[0009] In some designs, the opening is located on the side away from the gas balance channel inside the pump body.

[0010] In some designs, the baffle plate extends along its length toward the bottom of the pump body on both sides, and its projection along the length of the baffle plate at least partially overlaps with the gear assembly inside the pump body.

[0011] In some designs, the baffle plate extends along its width toward the side away from the gas balance channel inside the pump body, and its projection along the height of the pump body covers the gear assembly.

[0012] In some designs, the partition plate is threaded to the pump body.

[0013] Secondly, this application also discloses a Roots vacuum pump, including a pump body and the anti-splash structure in the first aspect. The pump body has a first chamber and a second chamber. A gear assembly is disposed in the first chamber. The first chamber and the second chamber are connected through a gas balance channel. The anti-splash structure is installed in the first chamber and is located between the gear assembly and the gas balance channel.

[0014] In some designs, the gear assembly comprises two meshing gears; And / or, the first chamber is provided with an oil filling port, which is connected to the oil sump inside the first chamber.

[0015] The technical solution adopted in this utility model can achieve the following beneficial effects: The anti-splash structure of this application uses a partition plate as a physical barrier, directly installed between the gear assembly and the air balance channel. This effectively blocks oil droplets agitated and splashed by the high-speed rotating gear assembly, preventing oil droplets from directly and in large quantities entering the inlet of the air balance channel. This significantly reduces the risk of lubricating oil being directly pumped into the clean pump chamber, reducing oil waste. The partition plate ensures the cleanliness of the main pump chamber, avoiding increased rotor running resistance, decreased vacuum performance, and potential jamming risks caused by oil contamination. This effectively extends the service life of the Roots vacuum pump and improves operational reliability. The oil baffle plate directly intercepts oil droplets splashed from the high-speed rotating gear assembly or centrifugally ejected, preventing oil splashing. Furthermore, the oil baffle plate effectively captures and guides oil droplets back to the oil sump before they come into contact with and may cross the partition plate, greatly reducing the oil-blocking pressure on the partition plate and thus lowering the probability of oil droplets entering the clean pump chamber through the air balance channel. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0017] Figure 1 This is a schematic diagram of the anti-splash structure and the installation of the Roots vacuum pump disclosed in some embodiments of this application. Figure 1 ; Figure 2 This is a schematic diagram of the anti-splash structure and the installation of the Roots vacuum pump disclosed in some embodiments of this application. Figure 2 ; Figure 3 This is an isometric view of the splash-proof structure disclosed in some embodiments of this application; Figure 4 This is a cross-sectional view of a Roots vacuum pump disclosed in some embodiments of this application; Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0018] In the picture: 100-Splashproof structure, 110-Oil baffle, 120-Divider plate, 130-Oil receiving assembly, 131-Oil receiving space, 132-Opening; 200-Roots vacuum pump, 210-Pump body, 211-First chamber, 212-Second chamber, 220-Gear assembly, 230-Gas balance channel, 240-Oil filler port, 250-Rotor. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0021] The inventors discovered during use that a few Roots vacuum pumps have an air balance channel in order to balance the chamber pressure. However, because there is lubricating oil in the gearbox, the high-speed rotating gears will continuously agitate and carry up a large number of oil droplets. The oil droplets carried up can easily enter the clean pump chamber of the Roots vacuum pump through the air balance channel, resulting in the waste of lubricating oil and affecting the service life of the Roots vacuum pump.

[0022] The following is in conjunction with the appendix Figures 1 to 5 The present application provides a detailed description of an anti-splash structure and a Roots vacuum pump through specific embodiments and application scenarios.

[0023] Some embodiments of this application disclose a splash-proof structure 100 applied to a Roots vacuum pump 200, including a partition plate 120, an oil baffle plate 110, and an oil receiving assembly 130.

[0024] like Figures 1-3 As shown, the partition plate 120 is installed inside the pump body 210, located between the air balance channel 230 and the gear assembly 220 within the pump body 210. Acting as a physical barrier, the partition plate 120, directly installed between the gear assembly 220 and the air balance channel 230, effectively blocks oil droplets agitated and splashed by the high-speed rotating gear assembly 220, preventing oil droplets from directly and in large quantities entering the inlet of the air balance channel 230. This significantly reduces the risk of lubricating oil being directly pumped into the clean pump chamber, reducing oil waste. The partition plate 120 ensures the cleanliness of the main pump chamber, avoiding increased rotor 250 operating resistance, decreased vacuum performance, and potential jamming risks caused by oil contamination. This effectively extends the service life of the Roots vacuum pump and improves operational reliability.

[0025] It should be noted that the gear assembly 220 includes two meshing gears.

[0026] like Figures 1-3As shown, the oil baffle 110 is disposed on the side of the partition plate 120 near the gear assembly 220 inside the pump body 210, and is located above the gear assembly 220 inside the pump body 210. The oil baffle 110 can directly intercept oil droplets splashing from the high-speed rotating gear assembly 220 or centrifugally ejected, preventing oil droplet splashing. Furthermore, the oil baffle 110 effectively captures and guides oil droplets back to the oil sump before they come into contact with and may cross the partition plate 120, greatly reducing the oil-blocking pressure on the partition plate 120, thereby reducing the probability of oil droplets entering the clean pump chamber through the air balance channel 230.

[0027] It should be noted that the pump body 210 contains an oil sump for storing lubricating oil to lubricate the gear assembly 220. Based on this structure, the oil baffle 110 located above the gear assembly 220 can quickly guide most of the oil droplets that are directly intercepted back into the oil sump below by gravity. This not only effectively prevents lubricating oil from splashing into the air balance channel 230, but also achieves immediate recovery and recycling of lubricating oil, minimizing oil loss and ensuring that the gear assembly 220 continuously receives sufficient lubrication. Thus, while solving the contamination problem, it also guarantees the reliability and lifespan of the transmission system.

[0028] like Figures 1-3 As shown, the oil receiving assembly 130 is positioned on top of the oil baffle 110, corresponding to the oil filling port 240 of the pump body 210. The oil receiving assembly 130 is connected to the oil sump inside the pump body 210, allowing the lubricating oil added through the oil filling port 240 to enter the oil sump inside the pump body 210 after passing through the oil receiving assembly 130. Integrating the oil receiving assembly 130 on top of the oil baffle 110 and aligning it with the oil filling port 240 provides a controlled flow path for the added lubricating oil. This allows the newly added lubricating oil to be smoothly introduced into the oil sump through the oil receiving assembly 130, rather than directly impacting the high-speed rotating gear assembly 220. This effectively avoids lubricating oil splashing, foaming, and oil mist diffusion caused by the agitation of the gear assembly 220 during the refueling process. This prevents the risk of lubricating oil leakage through the air balance channel 230 from the source, while ensuring the accuracy of oil level management in the oil sump and the stability of the lubrication system, improving the convenience and safety of maintenance operations.

[0029] In some embodiments, the oil receiving assembly 130 includes a first connecting plate, which is bent multiple times to form an oil receiving space 131 with an opening 132 on one side, together with the top of the oil baffle 110. The oil receiving space 131 communicates with the oil sump inside the pump body 210 through the opening 132. By bending the first connecting plate multiple times, it together with the top of the oil baffle 110 forms an oil receiving space 131 with an opening 132 on one side, creating a controlled buffer drainage path. The oil receiving space 131 smoothly converges and is guided to the oil sump through the lateral opening 132, suppressing splashing, foaming, and oil mist generation caused by direct impact of oil on the oil surface and gear assembly 220. This cuts off the possibility of lubricating oil tending towards the gas balance channel 230 due to splashing at the source during the refueling process, further preventing oil droplets from flowing backward through the gas balance channel 230.

[0030] In some embodiments, the oil receiving assembly 130 includes a plurality of second connecting plates, which are connected in sequence and form an oil receiving space 131 with an opening 132 on one side with the top of the oil baffle 110. The oil receiving space 131 communicates with the oil sump inside the pump body 210 through the opening 132. The connection of the plurality of second connecting plates together with the top of the oil baffle 110 forms an oil receiving space 131 with an opening 132 on one side, creating a controlled buffer drainage path. The oil receiving space 131 smoothly converges and is guided to the oil sump through the lateral opening 132, suppressing splashing, foaming, and oil mist generation caused by direct impact of oil on the oil surface and gear assembly 220. This cuts off the possibility of lubricating oil tending towards the gas balance channel 230 due to splashing at the source during the refueling process, further preventing oil droplets from flowing backward through the gas balance channel 230.

[0031] like Figure 2 and Figure 3 As shown, the opening 132 is located on the side away from the air balance channel 230 inside the pump body 210. By placing the opening 132 of the oil receiving space 131 on the side away from the air balance channel 230, the lubricating oil is actively guided to the area away from the air balance channel 230 through directional isolation of physical position. This greatly increases the difficulty for the lubricating oil to reach the air balance channel 230 and further reduces the possibility of the lubricating oil flowing backward through the air balance channel 230.

[0032] like Figure 1 , Figure 2 , Figure 3 and Figure 5As shown, the oil baffle 110 extends downwards along its length towards the bottom of the pump body 210, and its projection along its length at least partially overlaps with the gear assembly 220 inside the pump body 210. By extending downwards along its length and with its projection at least partially overlapping the gear assembly 220, a three-dimensional enclosed protective structure is constructed, increasing the effective coverage area of ​​the oil baffle 110. This effectively blocks oil droplets splashed out from the gear assembly 220 during rotation due to centrifugal force, achieving all-round coverage of the oil-stirring area of ​​the gear assembly 220 and ensuring that splashed oil droplets are effectively guided back to the oil sump.

[0033] In this embodiment, the length direction of the oil baffle 110 is as follows: Figure 2 As shown in L.

[0034] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the oil baffle 110 extends along its width toward the side away from the gas balance channel 230 inside the pump body 210, and its projection along the height direction of the pump body 210 covers the gear assembly 220. By extending the oil baffle 110 along its width toward the side away from the gas balance channel 230 and completely covering the gear assembly 220 in its vertical projection, the anti-splash performance of the oil baffle 110 is further increased, thereby minimizing the possibility of oil droplets splashing to the outside of the oil baffle 110.

[0035] In this embodiment, the width direction of the oil baffle 110 is as follows: Figure 2 As shown in W, the height direction of pump body 210 is as follows: Figure 5 As shown in H in the diagram.

[0036] The separator plate 120 is threadedly connected to the pump body 210. This threaded connection provides reliable preload, ensuring the separator plate 120 remains stable in the vibrating environment of the high-speed operation of the gear assembly 220. Simultaneously, when cleaning oil stains accumulated on the separator plate 120 or replacing parts, the threaded connection allows for non-destructive disassembly and reinstallation, greatly improving the convenience and economy of maintenance operations. This ensures the entire oil-blocking system maintains good long-term reliability and maintainability.

[0037] Some embodiments of this application also disclose a Roots vacuum pump 200, including a pump body 210 and a splash-proof structure 100.

[0038] like Figure 4As shown, the pump body 210 has a first chamber 211 and a second chamber 212. A gear assembly 220 is disposed in the first chamber 211, and the first chamber 211 and the second chamber 212 are connected by an air balance channel 230. When the second chamber 212 is evacuated, a pressure difference is formed between the first chamber 211 and the second chamber 212. After prolonged use, the sealing parts between the first chamber 211 and the second chamber 212 are prone to aging, which can cause lubricating oil in the first chamber 211 to permeate into the second chamber 212 under the influence of the pressure difference, affecting the service life of the Roots vacuum pump 200. Therefore, by connecting the first chamber 211 and the second chamber 212 through the air balance channel 230, the pressure difference between the first chamber 211 and the second chamber 212 is eliminated, thus preventing lubricating oil in the first chamber 211 from permeating into the second chamber 212 under the influence of the pressure difference when the second chamber 212 is evacuated.

[0039] It should be noted that the second chamber 212 is equipped with two rotors 250, which are respectively connected to the gear assembly 220. When the two rotors 250 rotate, they continuously form and isolate closed gas spaces on the inlet side, and then transport these gas spaces to the exhaust side, where the gas is discharged by the pressure difference created by the forepump. This process is repeated continuously, thereby achieving the purpose of gas removal and vacuum.

[0040] like Figure 5 As shown, the anti-splash structure 100 is installed in the first chamber 211 and located between the gear assembly 220 and the air balance channel 230. Installing the anti-splash structure 100 in the first chamber 211 and between the gear assembly 220 and the air balance channel 230 directly and effectively blocks oil droplets stirred up by the high-speed rotating gear assembly 220, preventing them from reaching the inlet channel of the air balance channel 230 without obstruction. This intercepts the lubricating oil at the beginning of its path to the second chamber 212 (main pump chamber), reducing the possibility of lubricating oil entering the second chamber 212.

[0041] like Figure 5 As shown, the first chamber 211 is provided with a filler port 240, which is connected to the oil sump inside the first chamber 211. By providing the filler port 240, daily replenishment and replacement of lubricating oil can be completed without any complicated disassembly of the pump body 210, thus shortening maintenance time.

[0042] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0043] Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0044] The above description is only a specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A splash-proof structure applied to a Roots vacuum pump, characterized by, include: A partition plate is installed inside the pump body and is located between the air balance channel inside the pump body and the gear assembly inside the pump body. An oil baffle is disposed on the side of the partition plate near the gear assembly inside the pump body, and is located above the gear assembly inside the pump body.

2. The anti-splashing structure according to claim 1, wherein The anti-splash structure also includes an oil receiving component, which is located on the top of the oil baffle corresponding to the oil filling port of the pump body. The oil receiving component is connected to the oil sump inside the pump body so that the lubricating oil added through the oil filling port enters the oil sump inside the pump body after passing through the oil receiving component.

3. A splash guard according to claim 2, wherein, The oil receiving assembly includes a first connecting plate, which is bent multiple times and forms an oil receiving space with the top of the oil baffle plate, with an opening on one side. The oil receiving space is connected to the oil sump inside the pump body through the opening.

4. The anti-splash structure according to claim 2, characterized in that, The oil receiving assembly includes multiple second connecting plates, which are connected in sequence and form an oil receiving space with the top of the oil baffle plate, with an opening on one side. The oil receiving space is connected to the oil sump inside the pump body through the opening.

5. A splash-proof structure according to claim 3 or 4, characterized in that, The opening is located on the side away from the gas balance channel inside the pump body.

6. The anti-splash structure according to claim 1, characterized in that, The oil baffle extends towards the bottom of the pump body on both sides along its length, and its projection along the length of the oil baffle at least partially overlaps with the gear assembly inside the pump body.

7. The anti-splash structure according to claim 1, characterized in that, The oil baffle extends along its width toward the side away from the gas balance channel in the pump body, and its projection along the height direction of the pump body covers the gear assembly.

8. The anti-splash structure according to claim 1, characterized in that, The partition plate is threadedly connected to the pump body.

9. A Roots vacuum pump, characterized in that, The device includes a pump body and an anti-splash structure as described in any one of claims 1-8, wherein the pump body has a first chamber and a second chamber, the gear assembly is disposed in the first chamber, the first chamber and the second chamber are connected by an air balance channel, and the anti-splash structure is installed in the first chamber and located between the gear assembly and the air balance channel.

10. A Roots vacuum pump according to claim 9, characterized in that, The gear assembly includes two meshing gears; And / or, the first chamber is provided with an oil filling port, which is connected to the oil sump inside the first chamber.

Images