Oil-free vacuum pump water cooling structure and vacuum pump

Abstract

This invention relates to the field of vacuum pump technology, and discloses an oil-free vacuum pump water cooling structure and a vacuum pump. The cooling structure includes a first, second, and third water circuit unit that are sequentially connected within the motor end plate, cylinder, and rear end plate. The first water circuit unit has a first cooling water inlet and outlet, the second water circuit unit is a first cylinder water circuit that penetrates the cylinder, and the third water circuit unit has a second cooling water circuit and a drain connector. This structure achieves full-area cooling of the motor end plate, cylinder, rear end plate, and bearings without oil lubrication, reducing thermal resistance and avoiding high temperatures on the end plate. Eliminating oil lubrication reduces the risk of oil leakage, and the simplified water circuit design makes the vacuum pump structure more compact. With the addition of a circulating pump and an air-cooled radiator, the cooling efficiency is further improved, making it suitable for high-efficiency heat dissipation in oil-free vacuum pumps.

Description

Technical Field

[0001] This invention relates to the field of vacuum pump technology, and more particularly to an oil-free cooled vacuum pump, specifically to an oil-free vacuum pump water cooling structure and a vacuum pump. Background Technology

[0002] Vacuum pumps are widely used in industrial production and various equipment applications. Oil-free vacuum pumps, due to their oil-free exhaust pollution characteristics, have become the preferred equipment in various fields. During the operation of an oil-free vacuum pump, the bearings at the motor end plate, cylinder, and rear end plate continuously generate a large amount of heat. If this heat cannot be dissipated in time, it will cause the temperature of the equipment components to rise too high, affecting the operational stability and service life of the vacuum pump.

[0003] In existing technologies, to cool the vacuum pump cylinder, a single cooling water path is typically designed only on the cylinder. This design not only makes the overall structure of the vacuum pump bulky but also limits the cooling range to the cylinder. For bearing cooling, most vacuum pumps use oil lubrication, absorbing bearing heat through the flow of lubricating oil. This method requires a continuous consumption of large amounts of lubricating oil, resulting in high operating costs and the risk of lubricating oil leakage, which can easily cause equipment contamination and malfunctions. Furthermore, the motor end plate and rear end plate of existing vacuum pumps serve only as structural seals and bearing supports, and do not have cooling functions. In addition, the inherent thermal resistance between the end plate and the cylinder prevents the heat transferred from the vacuum pump exhaust end to the end plate from being effectively dissipated, causing the end plate to remain at a high temperature for extended periods. To ensure effective bearing cooling, the amount of lubricating oil used must be further increased, creating a vicious cycle.

[0004] Furthermore, a single cylinder cooling water circuit suffers from low heat dissipation efficiency, as heat cannot be dissipated in a coordinated manner between components, easily leading to localized overheating. In severe cases, this can cause the vacuum pump to shut down, failing to meet the demands of continuous production. Therefore, there is an urgent need for a vacuum pump cooling structure that can achieve oil-free lubrication, global cooling, and a compact design, overcoming many of the shortcomings of existing technologies. Summary of the Invention

[0005] To address the issues of high oil consumption and easy leakage in existing vacuum pumps due to oil cooling, this application provides an oil-free vacuum pump water cooling structure and vacuum pump. The water-cooled oil-free cooling structure replaces the existing oil cooling, fundamentally solving the potential risks of oil consumption and leakage. Furthermore, water cooling is significantly more efficient than existing oil cooling, effectively removing heat from the entire vacuum pump casing. By sequentially designing interconnected cooling water circuit units within the motor end plate, cylinder, and rear end plate, comprehensive cooling of the core heat-generating components of the vacuum pump is achieved. This is more comprehensive than existing oil-cooled cylinder cooling and provides more significant protection for the bearings.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: An oil-free vacuum pump water cooling structure includes a first water circuit unit, a second water circuit unit, and a third water circuit unit that are sequentially connected and disposed in the motor end plate, cylinder body, and rear end plate, respectively. The first water circuit unit includes a first cooling water circuit disposed inside the motor end plate for cooling water to circulate. The first cooling water circuit has a first cooling water inlet disposed on the side wall of the motor end plate and a first cooling water outlet disposed on the end face near the cylinder block for connecting to the second water circuit unit. The second water circuit unit includes a first cylinder water circuit that runs through the cylinder block, and the first cylinder water circuit is connected to a second cooling water circuit disposed in the rear end plate; The third water circuit unit includes a second cooling water circuit disposed in the rear end plate. The second cooling water circuit is connected to the first cylinder block water circuit through a second cooling water inlet. The second cooling water circuit is also connected to a drain connector disposed on the outer end face of the rear end plate.

[0007] To avoid blockage of the cooling water path leading to obstructed cooling water circulation, and to increase the cooling water flow and improve heat exchange efficiency, preferably, two sets of non-interconnected first water path units are symmetrically arranged inside the motor end plate, two sets of non-interconnected second water path units are symmetrically arranged inside the cylinder, and two sets of non-interconnected third water path units are symmetrically arranged inside the rear end plate. The first, second, and third water path units located on the same side are sequentially connected to form a cooling passage with a first cooling water inlet and a drain connector.

[0008] To better dissipate heat from the first bearing housing, preferably, the motor end plate is provided with a first bearing housing for mounting the bearing, and the outer circumference of the first bearing housing is provided with a first cooling water channel for absorbing heat, and the angle of the first cooling water channel surrounding the first bearing housing is 270° to 360°.

[0009] To better dissipate heat from the second bearing housing, preferably, the rear end plate is provided with a second bearing housing for mounting the bearing, and the interior or periphery of the second bearing housing is provided with a second bearing housing cooling water channel for absorbing heat, and the angle of the second bearing housing cooling water channel surrounding the first bearing housing is 270°-360°.

[0010] To further improve the heat exchange efficiency of the cylinder block and increase the cooling water exchange efficiency between the motor end plate and the rear end plate, preferably, the motor end plate is also provided with a first branch connected to any of the first cooling water channels, the cylinder block is provided with a second cylinder block water channel, and the rear end plate is provided with a second branch connected to any of the second cooling water channels, wherein the first branch, the second cylinder block water channel and the second branch are connected in sequence.

[0011] The present invention also provides a water-cooling structure for cooling bearing housings. Specifically, a bearing cooling channel is provided between the second cooling water channel and the drain connector. The bearing cooling channel includes an outlet connector disposed on the rear end plate and connected to the second cooling water channel, a connecting pipe connected in sequence to the outlet connector, an inlet connector, a second bearing housing cooling water channel arranged in an annular shape inside the second bearing housing, and the drain connector.

[0012] This invention also provides an oil-free vacuum pump, which uses the above-mentioned oil-free vacuum pump water cooling structure to achieve water cooling heat dissipation. Specifically, it also includes a circulating pump and an air-cooled radiator. The first cooling water inlet of the vacuum pump is connected to the inlet of the circulating pump, the outlet of the circulating pump is connected to the inlet of the air-cooled radiator, and the outlet of the air-cooled radiator is connected to a drain connector. Beneficial effects

[0013] 1. The oil-free vacuum pump water cooling structure and vacuum pump of the present invention achieve full-area cooling of the core heat-generating components of the vacuum pump by sequentially designing interconnected cooling water circuit units in the motor end plate, cylinder body, and rear end plate. This breaks through the limitation of existing technologies that only cool the cylinder body, effectively eliminates the thermal resistance between the end plate and the cylinder body, promptly removes heat from the end plate, avoids high temperature phenomena in the end plate, fundamentally eliminates the cooling method of bearing oil lubrication, completely solves the technical problems of high lubricant consumption and oil leakage, realizes oil-free lubrication operation of the vacuum pump, and reduces equipment operating costs and maintenance difficulty.

[0014] 2. The cooling water circuit is designed to fit snugly against the bearing housing with an angle of 270° to 360°, which can maximize the absorption of heat generated by the bearing operation, ensure that the bearing operates at a low temperature, and extend the service life of the bearing; the two sets of independent cooling channels are symmetrically arranged, which can realize dual-channel synchronous cooling, greatly improve heat dissipation efficiency, and the other channel can continue to work in case of failure of one channel, thus improving the reliability of the cooling structure.

[0015] 3. The branch water channels added inside the motor end plate, cylinder body and rear end plate of this invention are connected to the main cooling channel to form an auxiliary cooling channel, which avoids the cooling failure problem caused by blockage of a single channel and further improves the stability of the cooling structure. At the same time, the cooling water channels are all integrated inside the motor end plate, cylinder body and rear end plate, eliminating the need for additional external cooling components, making the overall structure of the vacuum pump more compact and solving the problem of bulky equipment caused by the existing cooling water channel design.

[0016] 4. The cooling circulation system, consisting of a circulating pump and an air-cooled radiator, enables the recycling and secondary heat dissipation of cooling water, keeping the cooling water at a low temperature and further improving cooling efficiency. This ensures that the vacuum pump remains at a suitable operating temperature during long-term continuous operation, significantly improving the operational stability and service life of the vacuum pump. It is suitable for the heat dissipation needs of various oil-free vacuum pumps and has high practical and promotional value. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a top view of the vacuum pump of the present invention.

[0019] Figure 2 yes Figure 1 Full sectional view with the central section symbol AA.

[0020] Figure 3 yes Figure 1 Full sectional view of the section symbol BB along the center line.

[0021] Figure 4 This is a right view of the vacuum pump of the present invention.

[0022] Figure 5 yes Figure 4 Full sectional view with the section symbol CC along the center line.

[0023] Figure 6 yes Figure 4 Full sectional view of the section symbol DD along the center line.

[0024] Figure 7 This is a partial sectional view of the vacuum pump of the present invention, viewed from below.

[0025] Figure 8 yes Figure 7 Enlarged view of area E in the middle.

[0026] Figure 9 This is an isometric drawing of a vacuum pump.

[0027] In the diagram: 1-Motor end plate; 2-Cylinder body; 3-Rear end plate; 4-Water passage plug; 5-Bearing; 6-First bearing housing; 7-First cooling water passage; 8-First cooling water inlet; 9-First cooling water outlet; 10-First cylinder body water passage; 11-Second cooling water inlet; 12-Second cooling water outlet; 13-Second cooling water passage; 14-Second bearing housing; 15-Second bearing housing cooling water passage; 16-Outlet connector; 17-Connecting pipe; 18-Inlet connector; 19-Cap; 20-Drain connector; 21-First branch; 22-Second cylinder body water passage; 23-Second branch. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this application, it should be noted that the use of terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These terms are used solely for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the use of terms such as "first" and "second" in the description of this application is only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this application does not imply that the component is required to be absolutely horizontal or suspended, but rather that it may be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but rather that it may be slightly tilted.

[0033] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] Example 1: As Figures 1-9 As shown, the oil-free vacuum pump water cooling structure provided in this embodiment includes a motor end plate 1, a cylinder 2, and a rear end plate 3. The motor end plate 1 is provided with a first water circuit unit, the cylinder 2 is provided with a second water circuit unit, and the rear end plate 3 is provided with a third water circuit unit. The first water circuit unit, the second water circuit unit, and the third water circuit unit are connected in sequence to form a cooling passage.

[0035] The first water circuit unit is a first cooling water circuit 7 located inside the motor end plate 1. The first cooling water circuit 7 supplies cooling water. A first cooling water inlet 8 is provided on the side wall of the motor end plate 1. The first cooling water inlet 8 is connected to the first cooling water circuit 7. The first cooling water circuit 7 can be arranged in multiple layers, either intersecting or bending, in the heat accumulation area of ​​the motor end plate 1 as needed to improve heat exchange efficiency. A first cooling water outlet 9 is provided on the side end face of the motor end plate 1 near the cylinder 2. The first cooling water outlet 9 is connected to the first cooling water circuit 7 and is used to connect the first water circuit unit with the second water circuit unit.

[0036] The second water circuit unit is the first cylinder water circuit 10 that runs through the cylinder block 2. One end of the first cylinder water circuit 10 is connected to the first cooling water outlet 9, and the other end of the first cylinder water circuit 10 is connected to the third water circuit unit.

[0037] The third water circuit unit is the second cooling water circuit 13 located in the rear end plate 3. The rear end plate 3 has a second cooling water inlet 11, which is connected to the other end of the first cylinder water circuit 10. The second cooling water inlet 11 is also connected to the second cooling water circuit 13. A drain connector 20 is installed on the outer end face of the rear end plate 3, which is connected to the second cooling water circuit 13.

[0038] The working principle of this embodiment is as follows: Cooling water enters the first cooling water passage 7 from the first cooling water inlet 8 on the side wall of the motor end plate 1. During the flow in the first cooling water passage 7, it absorbs the heat on the motor end plate 1. Then, the cooling water enters the first cylinder water passage 10 on the cylinder 2 through the first cooling water outlet 9. During the flow in the first cylinder water passage 10, it absorbs the heat generated by the operation of the cylinder 2. Next, the cooling water enters the second cooling water passage 13 in the rear end plate 3 through the second cooling water inlet 11. After absorbing the heat on the rear end plate 3, it is finally discharged through the drain connector 20. This structure realizes continuous cooling of the motor end plate 1, cylinder 2, and rear end plate 3, breaking the limitation of the prior art that only cools the cylinder, eliminating the thermal resistance between the end plate and the cylinder, avoiding high temperature of the end plate, eliminating the need to rely on oil lubrication to cool the bearing, solving the problems of oil leakage and lubricant consumption, and the cooling water passage is integrated inside each component, making the vacuum pump structure more compact.

[0039] Example 2: As Figures 1-9 As shown, the oil-free vacuum pump water cooling structure of this embodiment, based on embodiment 1, has two sets of non-interconnected first water circuit units symmetrically arranged in the motor end plate 1, two sets of non-interconnected second water circuit units symmetrically arranged in the cylinder 2, and two sets of non-interconnected third water circuit units symmetrically arranged in the rear end plate 3. The first, second, and third water circuit units located on the same side are connected in sequence to form an independent cooling passage. Each cooling passage is provided with a first cooling water inlet 8 and a drain connector 20.

[0040] The working principle of this embodiment is as follows: Cooling water is simultaneously introduced into two independent cooling channels. The cooling water flows in its respective first cooling water channel 7, first cylinder water channel 10, and second cooling water channel 13, respectively. At the same time, it dissipates heat from both sides of the motor end plate 1, cylinder 2, and rear end plate 3, and finally discharges through their respective drain connectors 20. The dual independent cooling channels achieve dual-channel synchronous cooling of the core components of the vacuum pump, significantly improving the overall heat dissipation efficiency. Moreover, the two channels do not interfere with each other. When one channel becomes blocked or malfunctions, the other channel can continue to perform the cooling function, avoiding vacuum pump cooling failure due to a single-channel failure. This effectively improves the operational reliability and stability of the cooling structure and meets the heat dissipation requirements of the vacuum pump during long-term continuous operation. It is worth noting that this embodiment provides a layout of two sets distributed left and right. Alternatively, two sets can be arranged in the same area, meaning that the areas cooled by the two independent cooling structures are the same. Even if one cooling structure malfunctions or becomes blocked, it will not cause heat accumulation in the corresponding area. For example, if two sets of parallel and adjacent cooling structures are used, the heat exchange efficiency is twice that of a single set when the two sets are running synchronously. Even if one cooling structure becomes blocked, it will only reduce the heat dissipation efficiency, but there will be no problem of local high temperature or heat dissipation blind spots.

[0041] Example 3: As Figures 1-9 As shown, in this embodiment, the oil-free vacuum pump water cooling structure has a first water circuit unit in the motor end plate 1, a second water circuit unit in the cylinder 2, and a third water circuit unit in the rear end plate 3. The first water circuit unit, the second water circuit unit, and the third water circuit unit are connected in sequence. The first water circuit unit includes a first cooling water circuit 7 opened inside the motor end plate 1, a first cooling water inlet 8 on the side wall of the motor end plate 1, and a first cooling water outlet 9 on the end face of the motor end plate 1 near the cylinder 2. The second water circuit unit is a first cylinder water circuit 10 that penetrates the cylinder 2. The third water circuit unit includes a second cooling water circuit 13 opened inside the rear end plate 3, and the rear end plate 3 has a second cooling water inlet 11 and a drain connector 20.

[0042] A first bearing housing 6 is installed on the motor end plate 1. The first bearing housing 6 is used to install the bearing 5. A first cooling water channel 7 is arranged around the circumference of the first bearing housing 6. The angle of the first cooling water channel 7 surrounding the first bearing housing 6 is 270° to 360°. A second bearing housing 14 is installed on the rear end plate 3. The second bearing housing 14 is used to install the bearing 5. A second bearing housing cooling water channel 15 is provided inside or around the circumference of the second bearing housing 14. The angle of the second bearing housing cooling water channel 15 surrounding the first bearing housing 6 is 270° to 360°.

[0043] The working principle of this embodiment is as follows: Cooling water enters the first cooling water passage 7 from the first cooling water inlet 8. Because the first cooling water passage 7 surrounds the first bearing housing 6 at 270° to 360°, the cooling water can fully absorb the heat generated by the operation of the bearing 5 in the first bearing housing 6 while flowing, and at the same time absorb the heat from the motor end plate 1. Then, the cooling water enters the first cylinder water passage 10 through the first cooling water outlet 9 to absorb the heat from the cylinder 2, and then enters the second cooling water passage 13 through the second cooling water inlet 11. When the cooling water flows in the second cooling water passage 13, it works with the second bearing housing cooling water passage 15 to absorb the heat generated by the operation of the bearing 5 in the second bearing housing 14, and at the same time absorbs the heat from the rear end plate 3. Finally, it is discharged through the drain connector 20. This structure achieves precise cooling of the bearings 5 ​​at both ends of the vacuum pump. The large-angle surround design allows the cooling water to fully contact the bearing housing, maximizing the absorption of the heat generated by the bearing operation, ensuring that the bearing 5 operates at low temperature, extending the bearing service life, and achieving full-area cooling of the motor end plate 1, cylinder 2, and rear end plate 3, completely eliminating the need for oil lubrication cooling, and further improving the operational stability of the vacuum pump.

[0044] Example 4: Figures 1-9As shown, in this embodiment, the oil-free vacuum pump water cooling structure has a first water circuit unit in the motor end plate 1, a second water circuit unit in the cylinder 2, and a third water circuit unit in the rear end plate 3. The first water circuit unit, the second water circuit unit, and the third water circuit unit are connected in sequence. The first water circuit unit includes a first cooling water circuit 7 opened inside the motor end plate 1, a first cooling water inlet 8 on the side wall of the motor end plate 1, and a first cooling water outlet 9 on the end face of the motor end plate 1 near the cylinder 2. The second water circuit unit is a first cylinder water circuit 10 that penetrates the cylinder 2. The third water circuit unit includes a second cooling water circuit 13 opened inside the rear end plate 3, and the rear end plate 3 has a second cooling water inlet 11 and a drain connector 20.

[0045] The motor end plate 1 is provided with a first branch 21, which is connected to the first cooling water passage 7. The cylinder body 2 is provided with a second cylinder water passage 22. The rear end plate 3 is provided with a second branch 23, which is connected to the second cooling water passage 13. The first branch 21, the second cylinder water passage 22, and the second branch 23 are connected in sequence to form an auxiliary cooling channel. The rear end plate 3 is provided with a second bearing housing 14, and a bearing 5 is installed in the second bearing housing 14. A bearing cooling channel is provided between the second cooling water passage 13 and the drain connector 20. The bearing cooling channel includes an outlet connector 16 installed on the rear end plate 3. The outlet connector 16 is connected to the second cooling water passage 13. A connecting pipe 17 is connected to the outlet connector 16. The end of the connecting pipe 17 away from the outlet connector 16 is connected to an inlet connector 18. The second bearing housing 14 is provided with a ring-shaped second bearing housing cooling water passage 15. The inlet connector 18 is connected to the second bearing housing cooling water passage 15. The second bearing housing cooling water passage 15 is connected to the drain connector 20.

[0046] The working principle of this embodiment is as follows: After the cooling water enters the first cooling water passage 7 from the first cooling water inlet 8, part of it flows along the main cooling passage through the first cooling water outlet 9, the first cylinder water passage 10, and the second cooling water inlet 11 into the second cooling water passage 13. The other part flows through the first branch 21 into the second cylinder water passage 22, and then through the second branch 23 into the second cooling water passage 13. The main and auxiliary channels simultaneously achieve heat dissipation, avoiding cooling failure caused by blockage of a single channel. The cooling water entering the second cooling water passage 13 enters the connecting pipe 17 through the outlet connector 16, and then enters the annular second bearing housing cooling water passage 15 in the second bearing housing 14 through the inlet connector 18. When the cooling water flows in the annular water passage, it fully surrounds the bearing 5, maximizing the absorption of the operating heat of the bearing 5, and finally discharges through the drain connector 20. The auxiliary cooling channel added to this structure improves the fault resistance of the cooling structure. The annular second bearing housing cooling water passage 15 allows for more sufficient heat exchange between the cooling water and the bearing 5, further improving the bearing cooling effect, while achieving full-area heat dissipation, ensuring that all components of the vacuum pump are at a suitable operating temperature.

[0047] Example 5: Figures 1-9 As shown, the oil-free vacuum pump of this embodiment includes the above-mentioned oil-free vacuum pump water cooling structure, and is also equipped with a circulating pump and an air-cooled radiator. The first cooling water inlet 8 of the vacuum pump is connected to the inlet of the circulating pump, the outlet of the circulating pump is connected to the inlet of the air-cooled radiator, and the outlet of the air-cooled radiator is connected to the drain connector 20 of the vacuum pump, forming a closed cooling circulation system.

[0048] The working principle of this embodiment is as follows: The circulating pump delivers cooling water to the first cooling water inlet 8 of the vacuum pump. After entering the cooling water circuit structure, the cooling water sequentially absorbs heat from the motor end plate 1, cylinder 2, bearing housing, and rear end plate 3. The heated cooling water is discharged through the drain connector 20 and enters the air-cooled radiator. The air-cooled radiator forces the heated cooling water to cool down. The cooled cooling water then re-enters the circulating pump and is delivered back to the first cooling water inlet 8, completing the recycling of the cooling water. This vacuum pump integrates a highly efficient water cooling structure, achieving oil-free lubrication and full-area cooling, solving the problems of oil leakage, lubricant consumption, and localized overheating. The matching closed-loop cooling circulation system realizes the recycling of cooling water, eliminating the need for continuous replenishment of cooling water, reducing operating costs. Furthermore, the air-cooled radiator provides secondary heat dissipation for the cooling water, ensuring that the cooling water is always at a low temperature, further improving cooling efficiency, allowing the vacuum pump to operate continuously and stably for a long time, effectively extending the overall service life of the vacuum pump, and making it suitable for various oil-free vacuum operation scenarios. Of course, depending on the application scenario, the air-cooled radiator can also be replaced with a water tank or any other metal structure that can dissipate heat naturally, such as a finned structure or a heat sink.

[0049] Example 6: As Figures 1-9As shown, the oil-free vacuum pump water cooling structure of this embodiment, based on embodiment 4, optimizes the mechanical structure of the cooling water channel structure, the water connection structure of each component, and the adaptation structure of the bearing housing cooling water channel. It also adds a water channel anti-blocking and flow guiding structure. The specific technical solution is as follows: A first water channel unit is provided in the motor end plate 1, a second water channel unit is provided in the cylinder 2, and a third water channel unit is provided in the rear end plate 3. The first, second, and third water channel units are connected sequentially. The first water channel unit includes a first cooling water channel 7, a first cooling water inlet 8, and a first cooling water outlet 9. The second water channel unit includes a first cylinder water channel 1. 0. The third water circuit unit includes a second cooling water circuit 13, a second cooling water inlet 11, and a drain connector 20; a first branch circuit 21 connected to the first cooling water circuit 7 is opened in the motor end plate 1, a second cylinder water circuit 22 is opened in the cylinder 2, and a second branch circuit 23 connected to the second cooling water circuit 13 is opened in the rear end plate 3. The first branch circuit 21, the second cylinder water circuit 22, and the second branch circuit 23 are connected in sequence; a second bearing seat 14 is provided on the rear end plate 3, and a bearing cooling channel is provided between the second cooling water circuit 13 and the drain connector 20. The bearing cooling channel includes an outlet connector 16, a connecting pipe 17, an inlet connector 18, and a second bearing seat cooling water circuit 15. Based on this, the flow channels of the first cooling water channel 7 and the second cooling water channel 13 both adopt a gradually changing cross-sectional structure. The cross-sectional area of ​​the flow channel decreases linearly from the inlet end to the outlet end, and the inner wall of the flow channel is polished. Annular sealing guide grooves are provided at the connection between the motor end plate 1 and the cylinder body 2, and at the connection between the cylinder body 2 and the rear end plate 3. These annular sealing guide grooves are connected to the corresponding cooling water outlet / inlet, and elastic sealing gaskets are embedded within the grooves. Spiral guide ribs are coaxially fixed within the first cylinder body water channel 10 and the second cylinder body water channel 22, providing spiral guidance. The ribs and the inner wall of the cylinder water passage form a spiral flow channel; the second bearing housing cooling water passage 15 adopts a double-ring nested ring structure, with the inner ring water passage and the outer ring water passage connected to each other, and the inner wall of the double ring water passage is evenly distributed with several arc-shaped guide fins; the inlet ends of the first cooling water inlet 8 and the second cooling water inlet 11 are equipped with conical anti-clogging filters, and the filters can be detachably fixed to the inner wall of the inlet through a snap-fit ​​structure; the outlet end of the drain connector 20 is equipped with a water flow buffer chamber, which is a spherical structure, and the connection between the buffer chamber and the second cooling water passage 13 is equipped with an oblique guide port. Meanwhile, the first cooling water channel 7 around the first bearing housing 6 adopts a segmented wrapping structure, dividing the 270°~360° wrapping water channel into three independent flow channels. The inlet end of each of the three flow channels is connected to the first cooling water inlet 8, and the outlet end merges and connects to the first cooling water outlet 9. The connecting pipe 17 adopts a bendable metal corrugated structure, and the connection between the connecting pipe 17 and the outlet connector 16 and the inlet connector 18 is equipped with a rotary quick-connect sleeve.

[0050] The working principle of this embodiment is as follows: When cooling water enters from the first cooling water inlet 8, the conical anti-clogging filter screen first filters impurities in the water to avoid water blockage. The filtered cooling water enters the gradually decreasing cross-section flow channel of the first cooling water channel 7. As the cross-section gradually decreases, the water flow velocity increases linearly, enhancing the heat exchange efficiency with the motor end plate 1 and the first bearing seat 6. The segmented wrapping flow channel of the first cooling water channel 7 allows the cooling water to wrap around the first bearing seat 6 from multiple directions. Combined with the polished inner wall of the flow channel to reduce water flow resistance, the heat absorption is more uniform. Subsequently, the cooling water is accurately introduced into the first cylinder water channel 10 and the second cylinder water channel 22 through the annular sealed guide groove at the connection between the motor end plate 1 and the cylinder 2. The elastic sealing gasket effectively prevents water leakage at the water channel connection. The spiral guide ribs in the cylinder water channel force the cooling water to form a spiral flow state, prolonging the residence time of the cooling water in the cylinder 2, fully absorbing the working heat of the cylinder 2, and increasing the heat exchange area between the water flow and the inner wall of the cylinder water channel. After entering the second cooling water passage 13 through the annular sealed guide groove of cylinder 2 and rear end plate 3, part of the cooling water completes auxiliary heat dissipation through the second branch 23. The main cooling water accelerates its flow after entering the second cooling water passage 13 with a gradually changing cross section, absorbing the heat of the rear end plate 3. Then, it enters the flexible corrugated metal connecting pipe 17 through the outlet connector 16. The corrugated connecting pipe can flexibly adjust the bending angle according to the vacuum pump assembly space to adapt to different installation scenarios. The rotary quick-connect sleeve makes the disassembly and assembly of the connecting pipe more convenient. The cooling water enters the double-ring nested cooling water passage of the second bearing housing 14 through the inlet connector 18. The connecting structure of the inner and outer rings allows the cooling water to fill the entire cooling area of ​​the bearing housing. The arc-shaped guide fins disrupt the water flow state, forming turbulence, enhancing heat exchange with the bearing 5, and maximizing the absorption of bearing operating heat. The cooling water that has completed heat exchange flows into the spherical water flow buffer chamber of the drain connector 20. The angled guide port allows the high-speed water flow to enter the buffer chamber smoothly, reducing the noise and pressure loss caused by water flow impact. Finally, it is discharged through the drain connector 20. The detachable conical anti-clogging filter can be disassembled and cleaned regularly to ensure long-term unobstructed water flow. The polished inner wall of the flow channel, the gradient cross-section structure, the spiral guide ribs, the double-ring nested water channel, and the arc-shaped guide fins optimize the water flow state from a mechanical structure perspective, achieving triple heat exchange enhancement through increased flow, increased range, and increased turbulence. The annular sealing guide groove and elastic sealing gasket improve the sealing performance and flow guidance accuracy of the water channel connection. The segmented bearing seat wraps around the water channel for more uniform cooling. The bendable corrugated connecting pipe and quick-connect sleeve improve the assembly compatibility and maintenance convenience of the cooling structure.

[0051] The beneficial effects of this embodiment are as follows: By optimizing the mechanical structure of the cooling water channel, connecting structure, and bearing housing cooling structure, without adding external heat exchange components, the simultaneous improvement of water flow velocity, heat exchange time, and heat exchange area is achieved simply by changing the mechanical shape of the water channel itself. The formation of turbulent flow allows for more complete heat exchange between the cooling water and the heat-generating components, resulting in a significant improvement in cooling efficiency compared to the original structure. The gradient cross-section and polished inner wall reduce water flow resistance and energy consumption, preventing water accumulation and scale buildup in the water channel. The detachable anti-clogging filter structurally solves the water channel blockage problem and extends the maintenance cycle of the cooling structure. The annular sealing guide groove and elastic sealing gasket completely eliminate the risk of leakage at the water channel connection, improving efficiency. The structure's sealing and reliability have been improved; the segmented enclosed water circuit and double-ring nested bearing water circuit allow for more uniform bearing cooling, preventing localized overheating and further extending the service life of bearing 5; the bendable corrugated connecting pipe and quick-connect sleeve make the assembly, debugging, and maintenance of the cooling structure more convenient, adapting to the assembly requirements of different specifications of oil-free vacuum pumps. The overall structure is still integrated inside the motor end plate 1, cylinder 2, and rear end plate 3, maintaining the compact structure advantage of the vacuum pump. Based on the original full-area cooling and oil-free lubrication, multiple optimizations have been achieved at the mechanical structure level, including high-efficiency heat exchange, low resistance and low consumption, leak-proof sealing, strong adaptability, and convenient maintenance, significantly improving the comprehensive performance and practical value of the cooling structure.

[0052] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A water-cooled structure for an oil-free vacuum pump, characterized in that: It includes a first water circuit unit, a second water circuit unit, and a third water circuit unit that are respectively installed in the motor end plate (1), the cylinder body (2), and the rear end plate (3) and connected in sequence; The first water circuit unit includes a first cooling water circuit (7) provided inside the motor end plate (1) for cooling water to flow through. The first cooling water circuit (7) has a first cooling water inlet (8) provided on the side wall of the motor end plate (1) and a first cooling water outlet (9) provided on the end face near the cylinder (2) for connecting to the second water circuit unit. The second water circuit unit includes a first cylinder water circuit (10) that runs through the cylinder block (2), and the first cylinder water circuit (10) is connected to a second cooling water circuit (13) disposed in the rear end plate (3); The third water circuit unit includes a second cooling water circuit (13) disposed in the rear end plate (3). The second cooling water circuit (13) is connected to the first cylinder water circuit (10) through the second cooling water inlet (11). The second cooling water circuit (13) is also connected to a drain connector (20) disposed on the outer end face of the rear end plate (3).

2. The water cooling structure for an oil-free vacuum pump according to claim 1, characterized in that: The motor end plate (1) is symmetrically provided with two sets of first water circuit units that are not connected to each other, the cylinder (2) is symmetrically provided with two sets of second water circuit units that are not connected to each other, and the rear end plate (3) is symmetrically provided with two sets of third water circuit units that are not connected to each other. The first water circuit unit, the second water circuit unit and the third water circuit unit located on the same side are connected in sequence to form a cooling passage with a first cooling water inlet (8) and a drain connector (20).

3. The water cooling structure for an oil-free vacuum pump according to claim 1, characterized in that: The motor end plate (1) is provided with a first bearing seat (6) for mounting the bearing (5). The outer circumference of the first bearing seat (6) is provided with a first cooling water channel (7) for absorbing heat. The angle of the first cooling water channel (7) surrounding the first bearing seat (6) is 270° to 360°.

4. The water cooling structure for an oil-free vacuum pump according to claim 1, characterized in that: The rear end plate (3) is provided with a second bearing seat (14) for mounting the bearing (5). The interior or periphery of the second bearing seat (14) is provided with a second bearing seat cooling water channel (15) for absorbing heat. The angle at which the second bearing seat cooling water channel (15) wraps around the first bearing seat (6) is 270°-360°.

5. The water cooling structure for an oil-free vacuum pump according to claim 1 or 2, characterized in that: The motor end plate (1) is also provided with a first branch (21) connected to any of the first cooling water channels (7), the cylinder (2) is provided with a second cylinder water channel (22), and the rear end plate (3) is provided with a second branch (23) connected to any of the second cooling water channels (13). The first branch (21), the second cylinder water channel (22), and the second branch (23) are connected in sequence.

6. The water cooling structure for an oil-free vacuum pump according to claim 4, characterized in that: A bearing cooling channel is also provided between the second cooling water channel (13) and the drain connector (20). The bearing cooling channel includes an outlet connector (16) provided on the rear end plate (3) and connected to the second cooling water channel (13), a connecting pipe (17) connected to the outlet connector (16) in sequence, an inlet connector (18), a second bearing seat cooling water channel (15) arranged in a ring shape in the second bearing seat (14), and the drain connector (20).

7. An oil-free vacuum pump, characterized in that: Includes the water cooling structure as described in any one of claims 1-6.

8. The oil-free vacuum pump according to claim 7, characterized in that: It also includes a circulating pump and an air-cooled radiator. The first cooling water inlet (8) of the vacuum pump is connected to the inlet of the circulating pump, the outlet of the circulating pump is connected to the inlet of the air-cooled radiator, and the outlet of the air-cooled radiator is connected to the drain connector (20).

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