Resid pump and resid processing equipment

Abstract

The utility model relates to the technical field of residual oil pumping, in particular to a residual oil pump and residual oil processing equipment, the residual oil pump includes balance pipe and the pump body for pumping residual oil, and the outside of pump body is equipped with pump inlet and pump outlet, the pump inlet is used for residual oil to flow into the inside of pump body, and the pump outlet is used for residual oil to flow out from the inside of pump body, the inside of pump body is equipped with rear end sealing cavity for containing seal oil, and the rear end sealing cavity is communicated with pump inlet through balance pipe to make the pressure of rear end sealing cavity reduce, and balance pipe is arranged at the outside of pump body, the residual oil pump of the utility model makes seal oil to be able to inject into rear end sealing cavity fully, prevents the problem that rear end sealing cavity cannot be effectively sealed with sufficient seal oil.

Description

Technical Field

[0001] This utility model relates to the field of residual oil pumping technology, specifically to a residual oil pump and residual oil processing equipment. Background Technology

[0002] Residual oil pumps are used to pump residual oil and are important pumping equipment in atmospheric and vacuum distillation units in the petrochemical industry. During the operation of residual oil pumps, sealing oil needs to be injected into both the front and rear sealing chambers simultaneously to maintain good sealing performance.

[0003] However, due to the internal structure of the sludge pump, during operation, the pressure in the rear sealing chamber is 0.7MPa~0.8MPa, while the pressure in the front sealing chamber is slightly negative. Therefore, the pressure in the rear sealing chamber is relatively higher, while the pressure in the front sealing chamber is relatively lower. During sealing oil injection, the injection pressure is only slightly higher than that in the rear sealing chamber, making injection more difficult in the rear chamber compared to the front chamber. This results in the rear sealing chamber often not receiving sufficient sealing oil for effective sealing. Utility Model Content

[0004] The purpose of this invention is to overcome the problem in the existing technology that the rear sealing cavity is prone to insufficient sealing oil for effective sealing.

[0005] To achieve the above objectives, this utility model provides a residual oil pump, which includes a balance pipe and a pump body for pumping residual oil. The outer side of the pump body is provided with a pump inlet and a pump outlet. The pump inlet is used for residual oil to flow into the interior of the pump body, and the pump outlet is used for residual oil to flow out of the interior of the pump body. The interior of the pump body is provided with a rear sealing cavity for accommodating sealing oil. The rear sealing cavity is connected to the pump inlet through the balance pipe to reduce the pressure in the rear sealing cavity. The balance pipe is located on the outside of the pump body.

[0006] In some embodiments, the balance pipe is fixedly connected to the outer side of the pump body.

[0007] In some embodiments, the balancing tube is provided with a pressure gauge capable of detecting the internal pressure.

[0008] In some embodiments, the balancing pipe is provided with a valve capable of adjusting the flow rate of the balancing pipe.

[0009] In some embodiments, the inner diameter of the balancing tube ranges from 10 mm to 30 mm.

[0010] In some embodiments, the balance tube is provided with a heating element for heating the balance tube.

[0011] In some embodiments, the heating element is a steam tracing pipe.

[0012] In some embodiments, the pump inlet is connected to the feed pipe, and one end of the balance pipe is connected to the feed pipe.

[0013] In some embodiments, a first mechanical seal is provided in the rear sealing cavity, which divides the rear sealing cavity into a first sealing cavity (14) and a second sealing cavity; the first sealing cavity is closer to the pump outlet than the second sealing cavity; the first sealing cavity is connected to the pump inlet through a balance pipe.

[0014] In another aspect, this utility model provides a residual oil processing device, which includes the residual oil pump described in the above embodiment.

[0015] The above-mentioned technical solution of this utility model has the following beneficial effects: The balance pipe connects the rear sealing cavity to the pump inlet. The slight negative pressure at the pump inlet affects the pressure in the rear sealing cavity, significantly reducing its pressure and thus lowering the difficulty of injecting sealing oil. This ensures that the sealing oil is fully injected into the rear sealing cavity, guaranteeing its sealing effect. Therefore, the sludge pump of this invention allows for sufficient injection of sealing oil into the rear sealing cavity, preventing the problem of insufficient sealing oil for effective sealing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a sludge pump in one embodiment of the present invention; Figure 2 This is a schematic diagram showing the distribution of the heating elements in one embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures 1. Pump body; 2. Housing; 3. Shaft; 4. Mechanical seal; 5. First mechanical seal; 6. Second mechanical seal; 7. Pump inlet; 8. Pump outlet; 9. Impeller working chamber; 10. Front sealing chamber; 11. Third sealing chamber; 12. Fourth sealing chamber; 13. Rear sealing chamber; 14. First sealing chamber; 15. Second sealing chamber; 16. Feed pipe; 17. Balance pipe; 18. Pressure gauge; 19. Valve; 20. Heating element; 21. Drive motor; 22. Bearing; 23. Oil injection device; 24. Oil injection pipe. Detailed Implementation

[0018] The features and exemplary embodiments of various aspects of this utility model will now be described in detail. To make the objectives, technical solutions, and advantages of this utility model clearer, the following description, in conjunction with the accompanying drawings and specific embodiments, will provide a further detailed description. It should be understood that the specific embodiments described herein are intended only to explain this utility model and not to limit it. For those skilled in the art, this utility model can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this utility model by illustrating examples of it.

[0019] To facilitate those skilled in the art to understand the technical solution of this utility model, this utility model first provides a brief introduction to the slag oil pump.

[0020] The residual oil pump includes a drive motor 21 and a pump body 1, wherein the pump body 1 further includes a housing 2, a rotating shaft 3, an impeller, and two mechanical seals 4. The outer side of the housing 2 has a pump inlet 7 and a pump outlet 8. The rotating shaft 3 is installed inside the housing 2, and its two ends are rotatably connected to the housing 2 via bearings 22. The impeller is fixed to the rotating shaft 3 and located inside the housing 2. The housing 2 has an impeller working chamber 9, a front sealing chamber 10, and a rear sealing chamber 13. The impeller working chamber 9 is located between the front sealing chamber 10 and the rear sealing chamber 13. The rotating shaft 3 passes sequentially through the front sealing chamber 10, the impeller working chamber 9, and the rear sealing chamber 13, with the impeller located within the impeller working chamber 9. The drive motor 21 drives the rotating shaft 3 to rotate, which in turn drives the impeller to rotate. When the impeller rotates, a pressure difference is created within the impeller working chamber 9, causing the residual oil to enter the low-pressure area of ​​the impeller working chamber 9 from the pump inlet 7, then move to the high-pressure area of ​​the impeller working chamber 9, and finally flow out from the pump outlet 8. Because the pump inlet 7 is connected to the low-pressure area of ​​the impeller working chamber 9, the pump inlet 7 is under a slightly negative pressure; while the pump outlet 8 is connected to the high-pressure area of ​​the impeller working chamber 9, thus the pump outlet 8 has a higher pressure. As a result, the front sealing chamber 10 is under a slightly negative pressure because it is close to the low-pressure area of ​​the impeller working chamber 9 and the pump inlet 7; while the rear sealing chamber 13 is under a higher pressure (0.7MPa~0.8MPa) because it is close to the high-pressure area of ​​the impeller working chamber 9 and the pump outlet 8.

[0021] Two mechanical seals 4 are respectively installed in the front sealing cavity 10 and the rear sealing cavity 13. The mechanical seals 4 are sleeved on the rotating shaft 3 and fixed to the housing 2. The mechanical seals 4 are used to prevent residual oil from seeping into the installation area of ​​the bearing 22. To improve the sealing effect, the sealing oil injection device 23 continuously injects sealing oil into the front sealing cavity 10 and the rear sealing cavity 13 through the oil injection pipe 24, so that the mechanical seals 4 can always be completely immersed in the sealing oil. Since the front sealing cavity 10 and the rear sealing cavity 13 are respectively connected to the impeller working cavity 9, some sealing oil will flow into the impeller working cavity 9 due to pressure and mix with the residual oil. On the one hand, the quality of the sealing oil is better than that of the residual oil, and the sealing oil will not have an adverse effect on the quality of the residual oil; on the other hand, the front sealing cavity 10 and the rear sealing cavity 13 can always hold a sufficient amount of sealing oil, so that the mechanical seals 4 can always be completely immersed in the sealing oil. Therefore, the situation of sealing oil flowing into the impeller working cavity 9 is permissible. However, due to the higher pressure in the rear sealing chamber 13 and the lower pressure in the front sealing chamber 10, and the fact that the sealing oil injection pressure is only slightly higher than that in the rear sealing chamber 13, it is difficult to fully inject the sealing oil into the high-pressure rear sealing chamber 13. This makes the rear sealing chamber 13 prone to a decrease in sealing performance due to insufficient sealing oil supply.

[0022] This utility model proposes a solution to the problem that sealing oil is difficult to fully inject into the rear sealing cavity 13.

[0023] like Figure 1 As shown, this utility model provides a residual oil pump, which includes a balance pipe 17 and a pump body 1 for pumping residual oil. The outer side of the pump body 1 is provided with a pump inlet 7 and a pump outlet 8. The pump inlet 7 is used for residual oil to flow into the interior of the pump body 1 (residual oil flows from the pump inlet 7 into the impeller working chamber 9), and the pump outlet 8 is used for residual oil to flow out from the interior of the pump body 1 (residual oil flows from the impeller working chamber 9 into the pump outlet 8). The interior of the pump body 1 is provided with a rear sealing chamber 13 for accommodating sealing oil. The rear sealing chamber 13 is connected to the pump inlet 7 through the balance pipe 17 to reduce the pressure in the rear sealing chamber 13. The balance pipe 17 is located on the outside of the pump body 1.

[0024] Specifically, during the pumping of residual oil by pump body 1, the residual oil flows from pump inlet 7 into impeller working chamber 9 of pump body 1, and then flows out from pump outlet 8. The front sealing chamber 10, being close to the low-pressure area of ​​impeller working chamber 9 and pump inlet 7, is under a slightly negative pressure; the rear sealing chamber 13, being close to the high-pressure area of ​​impeller working chamber 9 and pump outlet 8, is under a higher pressure (0.7MPa~0.8MPa). However, the balance pipe 17 connects the rear sealing chamber 13 to pump inlet 7. The slightly negative pressure at pump inlet 7 affects the pressure in the rear sealing chamber 13, significantly reducing its pressure. This reduces the difficulty of injecting sealing oil into the rear sealing chamber 13, allowing the sealing oil to be fully injected and ensuring its sealing effect.

[0025] In this embodiment, the balance pipe 17 connects the rear sealing cavity 13 to the pump inlet 7. The slight negative pressure at the pump inlet 7 affects the pressure in the rear sealing cavity 13, significantly reducing its pressure and thus lowering the difficulty of injecting sealing oil into the rear sealing cavity 13. This ensures that the sealing oil is fully injected into the rear sealing cavity 13, guaranteeing its sealing effect. Therefore, by using the sludge pump of this invention, the sealing oil can be fully injected into the rear sealing cavity 13, preventing the problem of insufficient sealing oil for effective sealing in the rear sealing cavity 13.

[0026] It should be noted that during the injection of sealing oil into the rear sealing cavity 13, the sealing oil in the rear sealing cavity 13 also flows into the pump inlet 7 through the balance pipe 17. On the one hand, the quality of the sealing oil is higher than that of the residual oil, so it will not have a negative impact on the quality of the residual oil, nor will it affect the processing of the residual oil. On the other hand, since the rear sealing cavity 13 is connected to the pump inlet 7, the pressure in the rear sealing cavity 13 is significantly reduced, and the flow rate of the sealing oil in the balance pipe 17 will not be very large, so it will not interfere with the normal pumping of the residual oil.

[0027] It should also be noted that the pump body 1 of the sludge pump is a conventional device in this field. This utility model only briefly describes the housing 2, the rotating shaft 3, the impeller, and the two mechanical seals 4, so that those skilled in the art can understand this solution. Those skilled in the art can further refer to the prior art to understand the specific structural form of the pump body 1 of the sludge pump, which will not be described in detail here.

[0028] In some embodiments of this invention, the balance pipe 17 is fixedly connected to the outer side of the pump body 1. Preferably, the middle part of the balance pipe 17 is fixedly connected to the outer side of the pump body 1 via multiple connecting rods.

[0029] Specifically, the pump body 1 further includes a housing 2, and the balance pipe 17 is fixedly connected to the housing 2 to stabilize the position of the balance pipe 17 and prevent the balance pipe 17 from shaking.

[0030] In some embodiments, the first end of the balance tube 17 passes through the housing 2 and extends to the rear sealing cavity 13, so that the balance tube 17 communicates with the rear sealing cavity 13. At the same time, the first end of the balance tube 17 is welded to the housing 2 to seal the first end of the balance tube 17 and the housing 2.

[0031] In other embodiments, the housing 2 is provided with a connecting hole that communicates with the rear sealing cavity 13, and the head end of the balance tube 17 communicates with the connecting hole. Simultaneously, the head end of the balance tube 17 is welded to the housing 2 to seal the connection between the head end of the balance tube 17 and the housing 2.

[0032] like Figure 1As shown, in some embodiments of this utility model, the balance tube 17 is provided with a pressure gauge 18 capable of detecting its internal pressure.

[0033] Specifically, by setting pressure gauge 18, the pressure of the sealing oil in the balance pipe 17 can be detected in real time, which helps to understand whether the sealing oil in the balance pipe 17 is flowing normally.

[0034] like Figure 1 As shown, in some embodiments of this utility model, the balance pipe 17 is provided with a valve 19 that can adjust the flow rate of the balance pipe 17.

[0035] Specifically, when valve 19 is opened, the sealing oil in the rear sealing chamber 13 can flow into the pump inlet 7 through the balance pipe 17; when valve 19 is closed, the balance pipe 17 is no longer connected, and the sealing oil in the rear sealing chamber 13 will not flow into the pump inlet 7. Adjusting the opening of valve 19 regulates the flow rate of the sealing oil in the balance pipe 17. By setting valve 19, the sludge pump can be adapted to more operating conditions. Preferably, valve 19 can be a gate valve conventional in the art.

[0036] In some embodiments of this utility model, the inner diameter of the balance tube 17 is in the range of 10mm to 30mm, which can reduce the flow rate of sealing oil in the balance tube 17 without affecting the pressure reduction of the rear sealing cavity 13.

[0037] like Figure 2 As shown, in some embodiments of this utility model, the balance tube 17 is provided with a heating element 20 for heating the balance tube 17.

[0038] Specifically, the heating element 20 can heat the balance tube 17 to prevent the sealing oil in the balance tube 17 from condensing and solidifying, thereby avoiding the sealing oil from clogging the balance tube 17.

[0039] In some embodiments of this utility model, the heating element 20 is a steam heat tracing pipe.

[0040] Specifically, the steam tracing pipe is wound around the balance pipe 17, and the steam supply device can supply high-temperature steam to the steam tracing pipe to heat the balance pipe 17.

[0041] In some embodiments, the heating element 20 can also be an electric heating tape, which is wound around the balance tube 17. When the electric heating tape is energized, it can heat the balance tube 17. Of course, the heating element 20 can also be other heating devices, and this invention is not limited thereto.

[0042] like Figure 1 As shown, in some embodiments of this utility model, the pump inlet 7 is connected to the feed pipe 16, and one end of the balance pipe 17 is connected to the feed pipe 16.

[0043] Specifically, by setting up the feed pipe 16, it is convenient to connect the end of the balance pipe 17 and to connect the end of the balance pipe 17 to the pump inlet 7. Of course, since the feed pipe 16 is connected to the pump inlet 7, it is also in a slightly negative pressure state.

[0044] like Figure 1 As shown, in some embodiments of this utility model, a first mechanical seal 5 is provided in the rear sealing cavity 13, and the first mechanical seal 5 divides the rear sealing cavity 13 into a first sealing cavity 14 and a second sealing cavity 15; the first sealing cavity 14 is closer to the pump outlet 8 than the second sealing cavity 15; the first sealing cavity 14 is connected to the pump inlet 7 through a balance pipe 17.

[0045] Specifically, the pump body 1 further includes two mechanical seals 4, namely a first mechanical seal 5 and a second mechanical seal 6. The first mechanical seal 5 is disposed in the rear sealing cavity 13, and is sleeved on the rotating shaft 3 and fixed to the housing 2. The first mechanical seal 5 divides the rear sealing cavity 13 into a first sealing cavity 14 and a second sealing cavity 15. The first sealing cavity 14 is located between the second sealing cavity 15 and the impeller working cavity 9, so the first sealing cavity 14 is adjacent to the impeller working cavity 9. The first sealing cavity 14 is under a relatively high pressure (0.7MPa~0.8MPa) due to its proximity to the high-pressure area of ​​the impeller working cavity 9 and the pump outlet 8. The sealing oil injection device 23 injects sealing oil into the first sealing cavity 14 to achieve sealing. The first sealing cavity 14 is connected to the pump inlet 7 through the balance pipe 17, thereby reducing the pressure in the first sealing cavity 14.

[0046] In some embodiments, such as Figure 1 As shown, the second mechanical seal 6 is disposed in the front sealing cavity 10, and is sleeved on the rotating shaft 3 and fixed to the housing 2. The second mechanical seal 6 divides the rear sealing cavity 13 into a third sealing cavity 11 and a fourth sealing cavity 12. The third sealing cavity 11 is located between the fourth sealing cavity 12 and the impeller working cavity 9, so the third sealing cavity 11 is adjacent to the impeller working cavity 9. The third sealing cavity 11 is in a slightly negative pressure state due to its proximity to the low-pressure area of ​​the impeller working cavity 9 and the pump inlet 7. The sealing oil injection device 23 injects sealing oil into the third sealing cavity 11, so that the third sealing cavity 11 is sealed. In addition, the fourth sealing cavity 12 and the second sealing cavity 15 are sealed by other sealing systems, so that the front sealing cavity 10 and the rear sealing cavity 13 achieve a two-stage seal.

[0047] This utility model also provides a residual oil processing device, which includes the residual oil pump described in the above embodiment.

[0048] Specifically, since the residual oil processing equipment uses the residual oil pump described in the above embodiment, it can also achieve the above-mentioned technical effects.

[0049] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The above examples are only for the purpose of helping to understand the method and core ideas of this utility model. The above are only preferred embodiments of this utility model. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this utility model, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the concept and technical solution of this utility model to other occasions without modification, should all be considered within the protection scope of this utility model.

Claims

1. A residual oil pump, characterized in that, The pump body (1) includes a balance pipe (17) and a pump body (1) for pumping residual oil. The pump body (1) has a pump inlet (7) and a pump outlet (8) on its outer side. The pump inlet (7) is used for residual oil to flow into the interior of the pump body (1), and the pump outlet (8) is used for residual oil to flow out of the interior of the pump body (1). The interior of the pump body (1) is provided with a rear sealing cavity (13) for accommodating sealing oil. The rear sealing cavity (13) is connected to the pump inlet (7) through the balance pipe (17) to reduce the pressure in the rear sealing cavity (13). The balance pipe (17) is located outside the pump body (1).

2. The residual oil pump according to claim 1, characterized in that, The balance pipe (17) is fixedly connected to the outer side of the pump body (1).

3. The residual oil pump according to claim 1, characterized in that, The balance tube (17) is equipped with a pressure gauge (18) capable of detecting its internal pressure.

4. The residual oil pump according to claim 1, characterized in that, The balance pipe (17) is provided with a valve (19) that can adjust the flow rate of the balance pipe (17).

5. The residual oil pump according to claim 1, characterized in that, The inner diameter of the balance tube (17) ranges from 10mm to 30mm.

6. The residual oil pump according to claim 1, characterized in that, The balance tube (17) is provided with a heating element (20) for heating the balance tube (17).

7. The residual oil pump according to claim 6, characterized in that, The heating element (20) is a steam tracing pipe.

8. The residual oil pump according to claim 1, characterized in that, The pump inlet (7) is connected to the feed pipe (16), and one end of the balance pipe (17) is connected to the feed pipe (16).

9. The residual oil pump according to claim 1, characterized in that, The rear sealing cavity (13) is provided with a first mechanical seal (5), which divides the rear sealing cavity (13) into a first sealing cavity (14) and a second sealing cavity (15). The first sealing cavity (14) is closer to the pump outlet (8) than the second sealing cavity (15). The first sealing cavity (14) is connected to the pump inlet (7) through the balance pipe (17).

10. A residual oil processing device, characterized in that, The residual oil pump included in any one of claims 1-9.

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