Double-support single-side dynamic seal liquid ring pump

Abstract

The utility model belongs to the technical field of liquid ring pumps, in particular to a double-support single-side dynamic seal liquid ring pump, which is characterized in that two ends of a pump body are fixedly connected with a front distribution plate and a rear distribution plate respectively, the front end of the front distribution plate is fixedly connected with a front side cover, and the rear end of the rear distribution plate is fixedly connected with a rear side cover; a rolling bearing or a first sliding bearing and a dynamic seal are arranged between the bearing seat and the pump shaft, the front side cover and the rear side cover are respectively provided with an air inlet and an air outlet, a second sliding bearing is arranged between the rear side cover and the pump shaft and arranged in a sliding bearing cavity of the rear side cover, and a sliding bearing gland is arranged at the tail end of the pump shaft. A sealing gland is arranged at the rear end of the rear side cover and fixedly connected with the rear side cover, and a static seal is arranged between the sealing gland and the rear side cover. According to the utility model, a non-driving end is changed into static sealing, so that the sealing effect is better and the cost is low; and the sliding bearing can be fully lubricated and flushed, the heating of the bearing is reduced, and the service life of the sliding bearing is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to liquid ring pump technical field, especially a kind of double support single side dynamic sealing liquid ring pump. BACKGROUND

[0002] The existing liquid ring vacuum pump, in order to guarantee the rotation accuracy of shaft and the driving member on the shaft, is usually supported by two groups of rolling bearings to act on rotor, in the use process, both ends of pump are rolling bearings, and a long section of shaft of the front and rear sides of pump extends out of pump cavity, and in order to guarantee the sealing property of pump cavity, two sets of sealing systems are needed, and the cost of sealing system is higher, dynamic sealing is generally used, and the risk of dynamic sealing is greater than that of static sealing.

[0003] Some vacuum pumps change non-driving end into completely closed structure, and the problems are that the structure only has one side with air inlet and exhaust hole, greatly weakens the air inlet and exhaust function of liquid ring pump, causes the flow area of air inlet and exhaust passage to drop by half, seriously affects the performance of pump, thereby causing the decrease of pump air volume and the increase of shaft power. SUMMARY

[0004] In order to overcome the defects of the above prior art, the utility model provides a kind of double support single side dynamic sealing liquid ring pump, changes non-driving end into static sealing, and the sealing effect is better, and the performance of liquid ring pump is good.The technical problems to be solved by the utility model are realized through the following technical schemes:

[0005] A kind of double support single side dynamic sealing liquid ring pump, including pump body, impeller and pump shaft are arranged in pump body, and the front and rear distribution plates are fixedly connected with the two ends of pump body respectively, the front end of front distribution plate is fixedly connected with front side cover, the rear end of rear distribution plate is fixedly connected with rear side cover, front side cover is fixedly connected with bearing seat, rolling bearing or first sliding bearing and dynamic sealing are arranged between bearing seat and pump shaft, air inlet and exhaust port are arranged in front side cover and rear side cover, second sliding bearing is arranged between rear side cover and pump shaft, second sliding bearing is arranged in sliding bearing cavity of rear side cover, sliding bearing gland is arranged in the end of pump shaft, sealing gland is arranged in the rear end of rear side cover, sealing gland is fixedly connected with rear side cover, and static sealing is arranged between sealing gland and rear side cover.

[0006] Further, first overflow hole is arranged in rear side cover, second overflow hole is arranged in sliding bearing gland, the front end of first overflow hole is communicated with the cavity formed by rear side cover and rear distribution plate, first overflow hole is communicated with second overflow hole, and second overflow hole leads to second sliding bearing.

[0007] Further, the driving end of liquid ring pump rotor is supported by rolling bearing or first sliding bearing, and the non-driving end of liquid ring pump rotor is supported by second sliding bearing.

[0008] Specifically, the static sealing is sealing pad, sealing glue or sealing ring.

[0009] Specifically, dynamic seals can be mechanical seals, packing seals, or dry gas seals.

[0010] Even better, a protective bushing is provided between the second sliding bearing and the pump shaft.

[0011] Even better, the front cover can be replaced with the rear cover.

[0012] This invention replaces the non-driving end with a static seal, resulting in better sealing performance, improved liquid ring pump performance, and the elimination of a sealing device, thus reducing costs. Furthermore, it allows the sliding bearing to receive sufficient lubrication and flushing, reducing bearing heat generation and extending the sliding bearing's lifespan. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0014] Figure 2 This is a schematic diagram showing the connection between the rear cover and the sliding bearing cover;

[0015] Figure 3 This is a structural schematic diagram of Embodiment 2 of the present invention. Detailed Implementation

[0016] Example 1

[0017] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present utility model; as shown Figure 1 As shown, a double-supported single-sided dynamic seal liquid ring pump includes a pump body 1, an impeller 2 and a pump shaft 3 inside the pump body 1. The pump body 1 is fixedly connected to a front distribution plate 4 and a rear distribution plate 5 at both ends, respectively. The front end of the front distribution plate 4 is fixedly connected to a front side cover 6, and the rear end of the rear distribution plate 5 is fixedly connected to a rear side cover 7. The front side cover 6 is fixedly connected to a bearing seat 8. A rolling bearing or a first sliding bearing 9 and a dynamic seal 10 are provided between the bearing seat 8 and the pump shaft 3. Both the front side cover 6 and the rear side cover 7 are provided with an air inlet and an exhaust outlet. A second sliding bearing 11 is provided between the rear side cover 7 and the pump shaft 3. The second sliding bearing 11 is located in the sliding bearing cavity of the rear side cover 7. A sliding bearing cover 12 is provided at the end of the pump shaft 3. A sealing cover 13 is provided at the rear end of the rear side cover 7. The sealing cover 13 is fixedly connected to the rear side cover 7. A static seal 14 is provided between the sealing cover 13 and the rear side cover 7.

[0018] The main difference between double support and single-end sealed cantilever liquid ring pumps is that the rotor of such pumps is supported by a bearing on only one side, and the other side has no shaft extension, making it a fully enclosed structure. The double support of this utility model refers to the fact that the driving end of the liquid ring pump rotor is supported by a rolling bearing or a first sliding bearing, and the non-driving end of the liquid ring pump is supported by a second sliding bearing.

[0019] Figure 2 This is a schematic diagram showing the connection between the rear cover and the sliding bearing cover, as shown below. Figure 2 As shown, a first flow hole 7.1 is provided on the rear cover 7, and a second flow hole 12.1 is provided on the sliding bearing cover 12. The front end of the first flow hole 7.1 is connected to the cavity formed by the rear cover 7 and the rear distribution plate 5. The first flow hole 7.1 is connected to the second flow hole 12.1, and the second flow hole 12.1 leads to the second sliding bearing 11.

[0020] In conventional liquid ring pumps, the liquid level typically cannot reach the upper end of the sliding bearing. The working fluid adheres to the shaft and is carried to the upper end of the sliding bearing for lubrication and flushing during rotation. Although the sliding bearing is primarily stressed at the lower end, various operating conditions, rotor vibrations, and other factors mean that the bearing may experience stress in all directions. Insufficient lubrication and flushing of the sliding bearing can lead to overheating and reduced lifespan. Furthermore, the liquid ring pump forms a liquid ring during operation, which is often eccentric to the rotor. In conventional pumps, the liquid surface of the sliding bearing and the liquid ring may not make contact, preventing subsequent cleaning and lubrication of the sliding bearing. Overheating can cause partial liquid film failure, and may even lead to dry friction between the sliding bearing and the bearing or sleeve contact surfaces, severely impacting lifespan and stability.

[0021] Therefore, the functions of the first flow passage 7.1 and the second flow passage 12.1 are to ensure that the second sliding bearing 11 is adequately lubricated and flushed, extending its lifespan and reducing bearing overheating. When the liquid ring pump starts, the sealed cavity can store a certain amount of working fluid, providing lubrication and flushing to the sliding bearing for a period of time after startup. The working fluid forms a liquid ring under centrifugal force. The liquid ring enters the cavity formed by the rear cover 7 and the rear distribution plate 5 through the upper opening of the rear distribution plate 5, and is guided along the first flow passage 7.1 and the second flow passage 12.1 to the right end of the second sliding bearing 11. Under water pressure, some of the working fluid is squeezed into the gap between the second sliding bearing 11 and the pump shaft 3, and discharged from the left end of the second sliding bearing 11. Under centrifugal force, the liquid ring is reformed along the impeller 2, which enhances the sealing inside the pump. Excess working fluid will flow to the sealing cap 13, which contains a certain amount of working fluid. The level of the working fluid in the sealing cap 13 can cover most of the second sliding bearing 11, so that the second sliding bearing 11 is flushed and lubricated more fully.

[0022] The static seal 14 of this utility model is a sealing gasket, sealing adhesive or sealing ring, and the dynamic seal 10 is a mechanical seal, packing seal or dry gas seal; the drive end can use grease lubrication, oil lubrication or self-lubrication roller or sliding bearing, which can bear radial force and axial force at the same time, ensuring shaft support and shaft positioning. The sliding bearing at the non-drive end is a water lubrication bearing, which can bear radial load, and the sliding bearing can be lubricated and cooled by the working fluid in the liquid ring pump.

[0023] The front cover 6 and the rear cover 7 of this utility model have the same shape, except that the rear cover 7 has an additional flow hole inside. Therefore, the front cover 6 can be replaced by the rear cover 7. After replacement, the flow hole of the rear cover 7 will be blocked by the dynamic sealing body at the front end, and the working fluid will not leak out. Therefore, it does not affect the replacement use. The parts have strong versatility and are convenient for production and use. The rear cover 7 is provided with an air intake and exhaust channel, and also serves as a support frame. The rear cover 7 is supported on the ground, and its reliability is significantly better than the structure that is suspended and supported by a bearing seat. The rear distribution plate 5 is provided with an air intake and exhaust channel, and also serves as a sealing end face, resulting in better performance of the liquid ring pump.

[0024] The second sliding bearing 11 is installed in the gap between the rear cover 7 and the pump shaft 3. The second sliding bearing 11 is set in the sliding bearing cavity 7.1 of the rear cover 7, without the need to be set on a separate bearing seat. The main stress point is on the side cover. The sliding bearing cover 12 plays a fixing role, which makes the support more stable and makes maintenance and replacement simpler. The second sliding bearing 11 can be maintained and replaced by removing the sealing cover 13 and the sliding bearing cover 12. Compared with the existing liquid ring pump, the right side of this utility model is changed from dynamic seal to static seal, which not only saves a sealing device, but also reduces the risk of leakage.

[0025] Example 2

[0026] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of this utility model; as shown Figure 3 As shown, in Embodiment 2, a protective bushing 15 is provided between the second sliding bearing 11 and the pump shaft 3, and a round nut 16 is fitted onto the end of the pump shaft 3. The other settings in Embodiment 2 are the same as in Embodiment 1, and will not be described again here.

[0027] In Embodiment 2, a protective bushing 15 is added at the contact position between the second sliding bearing 11 and the pump shaft 3, and it is fixed with a round nut 16. This optimized design prevents the second sliding bearing 11 from directly contacting the pump shaft 3. The friction generated by the second sliding bearing 11 during operation will not directly wear the pump shaft 3, thus extending the service life of the pump shaft 3.

[0028] In summary, this invention replaces the non-driving end with a static seal, resulting in better sealing performance, improved liquid ring pump performance, and the elimination of a sealing device, thus reducing costs. Furthermore, it enables the sliding bearing to receive sufficient lubrication and flushing, reducing bearing heat generation and extending the lifespan of the sliding bearing.

Claims

1. A double-supported, single-sided dynamic seal liquid ring pump, comprising a pump body, wherein an impeller and a pump shaft are disposed within the pump body, and a front distribution plate and a rear distribution plate are fixedly connected to both ends of the pump body respectively; the front end of the front distribution plate is fixedly connected to a front side cover, and the rear end of the rear distribution plate is fixedly connected to a rear side cover; the front side cover is fixedly connected to a bearing housing; a rolling bearing or a first sliding bearing and a dynamic seal are disposed between the bearing housing and the pump shaft; and an air inlet and an exhaust outlet are provided on both the front and rear side covers. The pump body is characterized in that... A second sliding bearing is provided between the rear cover and the pump shaft. The second sliding bearing is located in the sliding bearing cavity of the rear cover. A sliding bearing cover is provided at the end of the pump shaft. A sealing cover is provided at the rear end of the rear cover. The sealing cover is fixedly connected to the rear cover. A static seal is provided between the sealing cover and the rear cover.

2. The double-supported single-sided dynamic sealing liquid ring pump according to claim 1, characterized in that, A first flow hole is provided on the rear side cover, and a second flow hole is provided on the sliding bearing cover. The front end of the first flow hole is connected to the cavity formed by the rear side cover and the rear distribution plate. The first flow hole is connected to the second flow hole, and the second flow hole leads to the second sliding bearing.

3. The double-supported single-sided dynamic sealing liquid ring pump according to claim 1, characterized in that, The driving end of the liquid ring pump rotor is supported by a rolling bearing or a first sliding bearing, while the non-driving end of the liquid ring pump rotor is supported by a second sliding bearing.

4. The double-supported single-sided dynamic sealing liquid ring pump according to claim 1, characterized in that, The static seal is a gasket, sealant, or sealing ring.

5. The double-supported single-sided dynamic sealing liquid ring pump according to claim 1, characterized in that, The dynamic seal is a mechanical seal, a packing seal, or a dry gas seal.

6. The double-supported single-sided dynamic sealing liquid ring pump according to claim 1, characterized in that, A protective bushing is provided between the second sliding bearing and the pump shaft.

7. The double-supported single-sided dynamic sealing liquid ring pump according to claim 1, characterized in that, The front cover can be replaced by the rear cover.

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