Roots vacuum pump with differential pressure elimination

Abstract

The utility model relates to roots vacuum pump technical field discloses a roots vacuum pump of eliminating pressure difference, include: gear chamber, install a pair of intermeshing gear group, pump body chamber, install a pair of rotor, and gear group still is connected with rotor, intermediate plate, set up between gear chamber and pump body chamber to divide apart gear chamber and pump body chamber, among them, intermediate plate is equipped with balance passage, and balance passage links gear chamber and pump body chamber, the utility model discloses through above technical scheme, to solve the technical problem that the lubricating oil in gear chamber in the roots vacuum pump of related art can possibly enter into the pump body chamber.

Description

Technical Field

[0001] This utility model relates to the field of Roots vacuum pump technology, and in particular to a Roots vacuum pump that eliminates pressure differential. 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, where it is then drawn away by the backing pump, 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] When using a Roots vacuum pump, lubricating oil in the gear chamber may enter the pump body chamber, causing lubricating oil waste, affecting the backing pump, and impacting the service life of the Roots vacuum pump. Summary of the Invention

[0004] This application discloses a Roots vacuum pump that eliminates pressure differential, in order to solve the technical problem in related technologies where lubricating oil in the gear chamber may enter the pump body chamber.

[0005] To solve the above problems, the present invention adopts the following technical solution: A Roots vacuum pump for eliminating pressure differential includes: The gear chamber contains a pair of meshing gear sets. The pump body chamber contains a pair of rotors, and the gear set is also connected to the rotors; An intermediate plate is positioned between the gear chamber and the pump body chamber to separate them. The intermediate plate is equipped with a balance channel, which connects the gear chamber and the pump chamber.

[0006] In some designs, the Roots vacuum pump that eliminates pressure differential also includes a splash guard, which is installed in the gear chamber to prevent lubricating oil from splashing from the gear set.

[0007] In some designs, the splash guard assembly includes a partition plate and an oil baffle plate, with the partition plate located in the gear chamber and connected to the intermediate plate corresponding to the balance channel; The oil baffle is positioned above the gear set and is connected to the partition plate.

[0008] In some designs, the gear chamber is provided with an oil filling port, and the anti-splash assembly also includes an oil receiving tray. The oil receiving tray is located on the top of the oil baffle plate corresponding to the oil filling port, and an opening is provided on one side of the oil receiving tray. The lubricating oil in the oil receiving tray enters the oil sump in the gear chamber through the opening.

[0009] In some designs, the opening is located on the side away from the balancing channel.

[0010] In some designs, the middle plate has a protrusion, and the partition plate is positioned on the protrusion to create a gap between the partition plate and the balance channel.

[0011] In some designs, an air balance nozzle is provided on the side of the intermediate plate corresponding to the gear chamber, and the air balance nozzle has an intermediate channel connecting the gear chamber and the balance channel.

[0012] In some designs, one end of the central channel is located on the circumferential wall of the air balance nozzle.

[0013] In some designs, the partition plate is connected to a raised thread.

[0014] In some designs, the oil baffle extends towards the bottom of the gear chamber on both sides along its length, and the oil baffle at least partially overlaps with the gear set along its projection along its length. And / or, the oil baffle extends along its width toward the side away from the balance channel, and along its projection in the height direction of the gear chamber, the oil baffle covers the gear set.

[0015] The technical solution adopted in this utility model can achieve the following beneficial effects: The pressure differential elimination Roots vacuum pump of this application effectively balances the huge pressure difference between the gear chamber and the pump body chamber by setting a balance channel in the intermediate plate. This prevents the lubricating oil in the gear chamber from entering the pump body chamber under the action of pressure difference, ensuring the high cleanliness of the pump body chamber, extending the service life of the Roots vacuum pump, and also saving lubricating oil. 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 cross-sectional view of a Roots vacuum pump for eliminating pressure differentials disclosed in some embodiments of this application; Figure 2 yes Figure 1 Enlarged view of point A in the middle; Figure 3 yes Figure 2 Enlarged view of point B in the middle; Figure 4 This is a schematic diagram of the installation of the splash-proof assembly and the intermediate plate disclosed in some embodiments of this application. Figure 1 ; Figure 5 This is a schematic diagram of the installation of the splash-proof assembly and the intermediate plate disclosed in some embodiments of this application. Figure 2 ; Figure 6 This is an isometric view of some embodiments of the splash-proof components disclosed in this application; Figure 7 This is an isometric view of the air balance nozzle disclosed in some embodiments of this application.

[0018] In the picture: 100 - Gear chamber, 110 - Gear set, 120 - Oil filler port; 200 - Pump body chamber; 210 - Rotor; 300 - Middle plate, 310 - Balance channel, 320 - Protrusion; 400-Splash protection assembly, 410-Oil baffle, 420-Divider plate, 430-Oil tray, 431-Opening; 500 - Air balance nozzle, 510 - Middle channel. 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 the use of the Roots vacuum pump that when the pump chamber is evacuated, a significant pressure difference is created between it and the gear chamber, which contains oil mist. The shaft seal, used to isolate the gear chamber and the pump chamber, inevitably experiences minor wear or aging under long-term high-speed operation, creating tiny gaps. Under the pressure difference, lubricating oil can seep into the pump chamber along the shaft surface, resulting in oil waste. Furthermore, the lubricating oil entering the pump chamber increases operating resistance and wear, leading to a deterioration of the ultimate vacuum, a decrease in pumping speed, and consequently, a significant shortening of the Roots vacuum pump's service life.

[0022] The following is in conjunction with the appendix Figures 1 to 7 The present application provides a detailed description of a Roots vacuum pump for eliminating pressure differentials through specific embodiments and application scenarios.

[0023] Some embodiments of this application provide a Roots vacuum pump for eliminating pressure differential, including a gear chamber 100, a pump body chamber 200, an intermediate plate 300, and an anti-splash assembly 400.

[0024] like Figure 2 As shown, a pair of meshing gear sets 110 are installed in the gear chamber 100, and a pair of rotors 210 are installed in the pump body chamber 200. The gear sets 110 are also connected to the rotors 210. The gear sets 110 transmit the power of the external motor to the rotors 210, thereby driving the two rotors 210 to rotate. Through high-speed rotation, the gas is continuously pushed from the air inlet to the air outlet, thereby achieving the purpose of air extraction.

[0025] like Figure 1 and Figure 2 As shown, an intermediate plate 300 is disposed between the gear chamber 100 and the pump body chamber 200 to separate them. By setting the intermediate plate 300, a physical barrier is formed, effectively preventing oil mist in the gear chamber 100 from diffusing into the high-vacuum pump body chamber 200. This is a fundamental structural guarantee for ensuring the cleanliness of the pump body chamber 200 and maintaining high pumping speed and excellent ultimate vacuum.

[0026] like Figures 1-3 As shown, the intermediate plate 300 is provided with a balance channel 310, which connects the gear chamber 100 and the pump body chamber 200. By providing the balance channel 310 in the intermediate plate 300, the large pressure difference between the gear chamber 100 and the pump body chamber 200 is effectively balanced, thereby preventing lubricating oil in the gear chamber 100 from entering the pump body chamber 200 under the influence of the pressure difference. This ensures high cleanliness within the pump body chamber 200, extends the service life of the Roots vacuum pump, and also saves lubricating oil.

[0027] like Figure 2 , Figure 4 and Figure 6As shown, the anti-splash component 400 is installed in the gear chamber 100 corresponding to the gear set 110 to block the lubricating oil splashed by the gear set 110. The anti-splash component 400, installed in the gear chamber 100 corresponding to the gear set 110, physically blocks the lubricating oil splash caused by the violent agitation during the high-speed rotation of the gear set 110, significantly reducing the concentration of diffuse oil mist in the gear chamber 100. This directly reduces the amount of oil flowing towards the balance channel 310, lowers the probability of lubricating oil flowing backward through the balance channel 310, and maintains the cleanliness of the pump body chamber 200.

[0028] like Figure 4 and Figure 6 As shown, the splashing assembly includes a partition plate 420 and an oil baffle plate 410. The partition plate 420 is located in the gear chamber 100 and is connected to the balance channel 310 and the intermediate plate 300. The partition plate 420 acts as a physical barrier, directly installed between the gear set 110 and the balance channel 310. It effectively blocks oil droplets stirred and splashed by the high-speed rotating gear set 110, preventing oil droplets from directly and in large quantities entering the inlet of the balance channel 310. This significantly reduces the risk of lubricating oil being directly pumped into the pump body chamber 200, reducing lubricating oil waste. The partition plate 420 ensures the cleanliness of the pump body chamber 200, avoiding increased rotor 210 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.

[0029] like Figures 4-6 As shown, the oil baffle 410 is positioned above the gear set 110 and connected to it. The oil baffle 410 can directly intercept oil droplets splashing from the high-speed rotating gear set 110 or flying out centrifugally, preventing oil droplet splashing. Furthermore, the oil baffle 410 effectively captures and guides oil droplets back to the oil sump before they come into contact with and may cross the partition plate 420, greatly reducing the oil-blocking pressure on the partition plate 420, thereby reducing the probability of oil droplets entering the pump chamber 200 through the balance channel 310.

[0030] like Figure 2 As shown, the gear chamber 100 is provided with a filler port 120. By providing the filler port 120, the daily replenishment and replacement of lubricating oil can be completed without any complicated disassembly of the gear chamber 100, thus shortening maintenance time.

[0031] like Figures 4-6As shown, the anti-splash assembly 400 also includes an oil receiving tray 430, which is positioned on top of the oil baffle 410 corresponding to the oil filling port 120. An opening 431 is provided on one side of the oil receiving tray 430, through which the lubricating oil in the oil receiving tray 430 enters the oil sump of the gear chamber 100. The oil receiving tray 430, positioned corresponding to the oil filling port 120, effectively catches any splashes and overflows that may occur due to the drop height when adding lubricating oil. The side opening 431 guides the lubricating oil back to the oil sump in an orderly and stable manner, preventing additional oil mist from being generated in the gear chamber 100 due to liquid impact during the filling process, and further preventing the lubricating oil from flowing backward through the balance channel 310.

[0032] In some embodiments, the oil receiving tray 430 includes a first connecting plate, which is bent multiple times to form an oil receiving space with the top of the oil baffle 410, having an opening 431 on one side. The oil receiving space communicates with the oil sump in the gear chamber 100 through the opening 431. By bending the first connecting plate multiple times, it and the top of the oil baffle 410 together form an oil receiving space with an opening 431 on one side, creating a controlled buffer drainage path. The oil receiving space smoothly converges and is guided to the oil sump through the lateral opening 431, suppressing splashing, foaming, and oil mist generation caused by direct impact of oil on the oil surface and gear set 110. This cuts off the possibility of lubricating oil tending towards the balance channel 310 due to splashing at the source during the refueling process, further preventing oil droplets from flowing backward through the balance channel 310.

[0033] In some embodiments, the oil receiving tray 430 includes a plurality of second connecting plates, which are connected in sequence and form an oil receiving space with the top of the oil baffle 410, having an opening 431 on one side. The oil receiving space communicates with the oil sump in the gear chamber 100 through the opening 431. The connection of the plurality of second connecting plates together with the top of the oil baffle 410 forms an oil receiving space with an opening 431 on one side, creating a controlled buffer drainage path. The oil receiving space smoothly converges and is guided to the oil sump through the lateral opening 431, suppressing splashing, foaming, and oil mist generation caused by direct impact of oil on the oil surface and gear set 110. This cuts off the possibility of lubricating oil tending towards the balance channel 310 due to splashing at the source during the refueling process, further preventing oil droplets from flowing backward through the balance channel 310.

[0034] like Figure 5 and Figure 6 As shown, the opening 431 is located on the side away from the balance channel 310. By placing the opening 431 of the oil receiving pan 430 on the side away from the balance channel 310, the lubricating oil is actively guided to the area away from the balance channel 310 through directional isolation of physical position. This greatly increases the difficulty for the lubricating oil to reach the balance channel 310 and further reduces the possibility of the lubricating oil flowing backward through the balance channel 310.

[0035] like Figure 4 As shown, the intermediate plate 300 has a protrusion 320, and the partition plate 420 is disposed on the protrusion 320 to create a gap between the partition plate 420 and the balance channel 310. The protrusion 320 serves as a natural positioning and installation reference for the partition plate 420, simplifying the assembly process and ensuring installation accuracy and consistency. Secondly, the protrusion 320 creates a gap between the partition plate 420 and the balance channel 310, which facilitates the installation of the partition plate 420 while allowing the balance channel 310 to connect to the gear chamber 100 through the gap.

[0036] like Figure 3 and Figure 5 As shown, an air balance nozzle 500 is provided on one side of the intermediate plate 300 corresponding to the gear chamber 100. The air balance nozzle 500 has an intermediate channel 510 connecting the gear chamber 100 and the balance channel 310. The intermediate channel 510 establishes a gas pressure tap extending into the gear chamber 100 for the balance channel 310 to ensure that the gear chamber 100 and the pump body chamber 200 are connected.

[0037] like Figure 7 As shown, one end of the intermediate channel 510 is located on the circumferential wall of the air balance nozzle 500. By placing one end of the intermediate channel 510 on the circumferential wall of the air balance nozzle 500, the physical property that the inertia of oil mist particles is much greater than that of gas is utilized. When the oil mist-rich airflow flows through the smooth circumferential wall, the oil droplets are difficult to change their flow direction and enter the channel quickly due to their large inertia, while the gas can easily flow in radially. This achieves the initial purification of the balanced airflow and significantly reduces the risk of lubricating oil entering the pump chamber 200 with the balanced airflow.

[0038] The separator plate 420 is threadedly connected to the protrusion 320. This threaded connection provides reliable preload, ensuring the separator plate 420 remains stable in the vibrating environment of the high-speed operation of the gear set 110. Simultaneously, when cleaning oil stains accumulated on the separator plate 420 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 maintainability while guaranteeing long-term operational reliability.

[0039] like Figure 4 and Figure 6As shown, the oil baffle 410 extends towards the bottom of the gear chamber 100 on both sides along its length, and its projection along the length of the oil baffle 410 at least partially overlaps with the gear set 110. By extending downwards on both sides of the oil baffle 410 along its length and having its projection at least partially overlap with the gear set 110, a three-dimensional surrounding protective structure is constructed, increasing the effective coverage area of ​​the oil baffle 410. This effectively blocks oil droplets splashed out from the gear set 110 during rotation due to centrifugal force, achieving all-round coverage of the oil-stirring area of ​​the gear set 110 and ensuring that splashed oil droplets are effectively guided back to the oil sump as much as possible.

[0040] In this embodiment, the length direction of the oil baffle 410 is as follows: Figure 5 As shown in L.

[0041] like Figures 4-6 As shown, the oil baffle 410 extends along its width toward the side away from the balance channel 310, and its projection along the height direction of the gear chamber 100 covers the gear set 110. By extending along its width toward the side away from the balance channel 310 and completely covering the gear set 110 in its vertical projection, the anti-splash performance of the oil baffle 410 is further increased, thereby minimizing the possibility of oil droplets splashing to the outside of the oil baffle 410.

[0042] In this embodiment, the width direction of the oil baffle 410 is as follows: Figure 5 As shown in W, the height direction of pump body 210 is as follows: Figure 2 As shown in H in the diagram.

[0043] 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.

[0044] 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.

[0045] The above description is only a specific embodiment of this utility model, but the protection scope of this 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 this utility model should be included within the protection scope of this utility model.

Claims

1. A Roots vacuum pump for eliminating pressure differential, characterized in that, include: The gear chamber contains a pair of meshing gear sets. The pump body chamber contains a pair of rotors, and the gear set is also connected to the rotors; An intermediate plate is disposed between the gear chamber and the pump body chamber to separate the gear chamber and the pump body chamber; The intermediate plate is provided with a balancing channel, which connects the gear chamber and the pump chamber.

2. The Roots vacuum pump for eliminating pressure differential according to claim 1, characterized in that, The Roots vacuum pump for eliminating pressure differential also includes an anti-splash assembly, which is installed in the gear chamber corresponding to the gear set and is used to block the lubricating oil splashed by the gear set.

3. A Roots vacuum pump for eliminating pressure differential according to claim 2, characterized in that, The splash-proof assembly includes a partition plate and an oil baffle plate. The partition plate is located in the gear chamber and is connected to the intermediate plate corresponding to the balance channel. The oil baffle is positioned above the gear set and is connected to the partition plate.

4. A Roots vacuum pump for eliminating pressure differential according to claim 3, characterized in that, The gear chamber is provided with an oil filling port, and the anti-splash assembly also includes an oil receiving tray. The oil receiving tray is disposed on the top of the oil baffle plate corresponding to the oil filling port, and an opening is provided on one side of the oil receiving tray. The lubricating oil in the oil receiving tray enters the oil sump of the gear chamber through the opening.

5. A Roots vacuum pump for eliminating pressure differential according to claim 4, characterized in that, The opening is located on the side away from the balancing channel.

6. A Roots vacuum pump for eliminating pressure differential according to claim 3, characterized in that, The intermediate plate has a protrusion, and the partition plate is disposed on the protrusion so that there is a gap between the partition plate and the balance channel.

7. A Roots vacuum pump for eliminating pressure differential according to claim 3, characterized in that, The intermediate plate is provided with an air balance nozzle on one side corresponding to the gear chamber, and the air balance nozzle has an intermediate channel connecting the gear chamber and the balance channel.

8. A Roots vacuum pump for eliminating pressure differential according to claim 7, characterized in that, One end of the intermediate channel is located on the circumferential wall of the air balance nozzle.

9. A Roots vacuum pump for eliminating pressure differential according to claim 6, characterized in that, The partition plate is connected to the protruding thread.

10. A Roots vacuum pump for eliminating pressure differential according to claim 4, characterized in that, The oil baffle extends toward the bottom of the gear chamber on both sides along its length, and its projection along the length of the oil baffle at least partially overlaps with the gear set. And / or, the oil baffle extends along its width toward the side away from the balance channel, and along the projection of the gear chamber height, the oil baffle covers the gear set.

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