Heavy wax oil pump for delayed coking device

By designing a heavy wax oil pump with horizontal centerline support, twin-vortex chamber and symmetrical runner in the delay coking device, the problem of excessive flushing fluid pressure and excessive mechanical sealing temperature is solved, and the effect of reducing the pressure and temperature of the sealing chamber is achieved, and the sealing service life is extended.

CN222576902UActive Publication Date: 2025-03-07CHENYANG CHENGZHI FLUID EQUIPMENT CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202421463591.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-25
Publication Date
2025-03-07
Estimated Expiration
2034-06-25

AI Technical Summary

Technical Problem

In the delayed coking device, the flushing fluid pressure of the heavy wax oil pump is too high, resulting in an increase in the mechanical sealing temperature and affecting the sealing service life.

Method used

A heavy wax oil pump for delayed coking device is designed, using a horizontal centerline support installation method, using a twin-roll chamber and a symmetrically arranged flow channel to reduce the pressure difference between the front and rear covers, and by adjusting the inner diameter of the impeller port ring and increasing the area of ​​the balance hole, balance the axial force and reduce the pressure and temperature of the sealing chamber.

Benefits of technology

It effectively reduces the thrust bearing temperature, reduces the pressure and temperature of the sealing chamber, and extends the service life of mechanical seals.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN222576902U_ABST
    Figure CN222576902U_ABST
Patent Text Reader

Abstract

The utility model relates to the technical field of oil pumps, in particular to a heavy wax oil pump for a delayed coking device, which comprises an oil pump main body, a pressure relief sleeve, an impeller nut, a pump cover, impeller wear rings and a pump shaft are arranged in the oil pump main body, and the inner diameter of the impeller wear ring on the left side is smaller than that of the impeller wear ring on the right side. The oil pump main body is supported by a horizontal center line, an overflowing part of the oil pump main body adopts double volute chambers, runners are symmetrically arranged, an exhaust hole and a liquid discharge hole are respectively formed in the upper part and the lower part of the oil pump main body, a suction inlet and a discharge outlet are formed in the oil pump main body, and two impellers of the oil pump main body are symmetrically arranged; the residual axial force is balanced by a pair of ball bearings which are arranged at the free end in a back-to-back mode, rear cover plates of two impeller hubs are provided with impeller suction inlets and balance holes communicated with the impeller suction inlets, and the total area of the sections of all the balance holes is 5-6 times larger than the area of the section of the gap of the sealing ring; according to the utility model, the problems of overlarge flushing pressure and overhigh mechanical sealing temperature can be solved.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model relates to the technical field of oil pumps, in particular to a heavy wax oil pump for a delayed coking device. Background Art

[0002] The heavy wax oil pump in the delayed coking unit plays a vital role in the entire unit. During the operation of the oil pump, the pressure of the mechanical seal flushing liquid is sometimes lower than the pressure of the pump seal chamber, which causes the temperature of the mechanical seal to rise, seriously affecting the service life of the mechanical seal and even damaging the mechanical seal, causing difficulties in on-site operation and operation. Therefore, a heavy wax oil pump for a delayed coking unit is proposed to solve the problems of excessive flushing pressure and excessive mechanical seal temperature. Utility Model Content

[0003] In view of the problems in the prior art, the utility model provides a heavy wax oil pump for a delayed coking device.

[0004] The technical solution adopted by the utility model to solve its technical problems is a heavy wax oil pump for a delayed coking device, comprising an oil pump body, wherein a pressure relief sleeve, an impeller nut, a pump cover, an impeller mouth ring and a pump shaft are arranged in the oil pump body, the pressure relief sleeve is arranged on the pump shaft, the inner diameter of the impeller mouth ring on the left side is smaller than the inner diameter of the impeller mouth ring on the right side, the installation mode of the oil pump body is horizontal centerline support, the flow portion of the oil pump body adopts a double vortex chamber, the flow channels are symmetrically arranged, the upper and lower parts of the oil pump body are respectively provided with exhaust holes and drain holes, the oil pump body is provided with a suction port and a discharge port, the two impellers of the oil pump body are symmetrically arranged, the residual axial force is balanced by a pair of back-to-back mounted ball bearings arranged at the free end, the rear cover plates of the two impeller hubs are provided with a suction port and a balancing hole connected to the impellers, the total area of ​​all the balancing hole sections is greater than 5-6 times the cross-sectional area of ​​the sealing ring gap, and the coupling of the oil pump body adopts a diaphragm extended coupling.

[0005] By adopting the above technical scheme, the installation method of the oil pump body is horizontal centerline support to minimize the deformation and displacement caused by thermal expansion and contraction. The flow part adopts a double vortex chamber, and the flow channel is symmetrically arranged. The oil pump body can exhaust by itself. The axial force of the oil pump body is balanced by the symmetrical arrangement of two impellers. The inner diameter of the impeller mouth ring on the left is smaller than the inner diameter of the impeller mouth ring on the right to reduce the pressure difference between the front and rear cover plates, so as to achieve the purpose of reducing the axial force and effectively reduce the temperature of the thrust bearing. The total area of ​​all balancing hole sections is greater than 5-6 times the cross-sectional area of ​​the sealing ring gap, so that the medium in the oil pump body returns to the inlet pipe from the balancing hole and will not leak into the machine seal cavity, thereby reducing the pressure and temperature of the seal cavity.

[0006] Specifically, the suction port and the discharge port of the oil pump body are both arranged vertically upward.

[0007] Specifically, the suction port and the discharge port of the oil pump body are cast integrally with the oil pump body.

[0008] Specifically, the pump cover is connected to the oil pump body through bolts.

[0009] Specifically, the two impellers are connected to the pump shaft of the oil pump body through impeller nuts.

[0010] Beneficial effects of the utility model:

[0011] (1) The heavy wax oil pump for a delayed coking device described in the utility model replaces the right mouth ring of the first-stage impeller and reduces the inner diameter of the mouth ring. Because the impeller nuts on both sides generate a pressure difference in the axial direction pointing to the driving side, and the original design also has a corresponding difference in the diameters of the left and right impeller mouth rings at the first-stage impeller, the accumulated difference causes the front cover plate of the impeller to be subjected to a large force and the rear cover plate to be subjected to a small force, which generates an axial force pointing to the driving side. The axial force is too large, which causes the temperature of the thrust bearing to rise. Now, the inner diameter of the mouth ring is reduced to reduce the pressure difference between the front and rear covers, thereby achieving the purpose of reducing the axial force and effectively reducing the temperature of the thrust bearing.

[0012] (2) The utility model discloses a heavy wax oil pump for a delayed coking device, wherein the inner diameter of the impeller mouth ring on the left side is smaller than the inner diameter of the impeller mouth ring on the right side, so as to reduce the pressure difference between the front and rear cover plates, thereby reducing the axial force and effectively reducing the temperature of the thrust bearing. The total cross-sectional area of ​​all the balancing holes is 5-6 times greater than the cross-sectional area of ​​the sealing ring gap, so that the medium in the oil pump body returns to the inlet pipe through the balancing holes and will not leak into the machine seal chamber, thereby reducing the pressure and temperature of the seal chamber.

[0013] (3) The heavy wax oil pump designed in the utility model enlarges the balance hole of the pump cover, lengthens the axial clearance between the throat bushing and the impeller nut, and reduces the radial throttling clearance between the throat bushing and the impeller nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1 It is a cross-sectional view of the utility model;

[0016] Figure 2 It is a cross-sectional view of the impeller of the utility model.

[0017] In the figure: 1. Pressure relief sleeve; 2. Impeller nut; 3. Pump cover; 4. Impeller mouth ring; 5. Impeller; 6. Balance hole. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0019] In order to solve the problem of excessive flushing pressure and excessive mechanical seal temperature, as an embodiment of the utility model, Figure 1 , Figure 2 As shown, a heavy wax oil pump for a delayed coking device described in the utility model comprises an oil pump body, wherein a pressure relief sleeve 1, an impeller nut 2, a pump cover 3, an impeller mouth ring 4 and a pump shaft are arranged in the oil pump body, the pressure relief sleeve 1 is sleeved on the pump shaft, the inner diameter of the impeller mouth ring 4 on the left side is smaller than the inner diameter of the impeller mouth ring 4 on the right side, the installation mode of the oil pump body is horizontal centerline support, the flow portion of the oil pump body adopts a double vortex chamber, and the flow channels are symmetrically arranged, the upper and lower parts of the oil pump body are respectively provided with exhaust holes and drain holes, the oil pump body is provided with a suction port and a discharge port, the two impellers 5 of the oil pump body are symmetrically arranged, the residual axial force is balanced by a pair of back-to-back mounted ball bearings arranged at the free end, the rear cover plates of the two impeller 5 hubs are provided with a suction port and a balance hole 6 connected to the impeller, the total area of ​​the cross section of all the balance holes 6 is greater than 5-6 times the cross-sectional area of ​​the sealing ring gap, and the coupling of the oil pump body adopts a diaphragm extension coupling.

[0020] When in use, the installation method of the oil pump body is horizontal centerline support to minimize the deformation and displacement caused by thermal expansion and contraction. The flow part adopts a double vortex chamber, and the flow channel is symmetrically arranged. The oil pump body can exhaust by itself. The axial force of the oil pump body is balanced by the symmetrical arrangement of two impellers 5. The inner diameter of the impeller mouth ring 4 on the left is smaller than the inner diameter of the impeller mouth ring 4 on the right to reduce the pressure difference between the front and rear cover plates, so as to achieve the purpose of reducing the axial force and effectively reduce the temperature of the thrust bearing. The total cross-sectional area of ​​all the balancing holes 6 is greater than 5-6 times the cross-sectional area of ​​the sealing ring gap, so that the medium in the oil pump body returns to the inlet pipe from the balancing hole 6 and will not leak into the machine seal cavity, thereby reducing the pressure and temperature of the seal cavity.

[0021] The suction port and the discharge port of the oil pump body are both arranged vertically upward.

[0022] The suction port and the discharge port of the oil pump body are cast integrally with the oil pump body.

[0023] The pump cover 3 is connected to the oil pump body by bolts.

[0024] The two impellers 5 are connected to the pump shaft of the oil pump body through the impeller nut 2.

[0025] When the utility model is in use, the installation mode of the oil pump body is horizontal centerline support to reduce the deformation and displacement caused by thermal expansion and contraction to a minimum. The flow passage part adopts a double vortex chamber, and the flow passage is symmetrically arranged. The oil pump body can exhaust by itself, and the axial force of the oil pump body is balanced by the symmetrical arrangement of the two impellers 5;

[0026] The inner diameter of the impeller ring 4 on the left side is smaller than that of the impeller ring 4 on the right side, so as to reduce the pressure difference between the front and rear cover plates, thereby reducing the axial force and effectively reducing the temperature of the thrust bearing;

[0027] The total cross-sectional area of ​​all the balancing holes 6 is 5-6 times greater than the cross-sectional area of ​​the sealing ring gap, so that the medium in the oil pump body returns to the inlet pipe through the balancing holes 6 and will not leak into the machine seal chamber, thereby reducing the pressure and temperature of the seal chamber.

[0028] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the description in the specification are only to illustrate the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements fall within the scope of protection claimed by the utility model. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents. The contents not described in detail in the utility model belong to the prior art known to those skilled in the art.

Claims

1. A heavy wax oil pump for a delayed coking device, characterized in that: The invention comprises an oil pump body, wherein a pressure relief sleeve (1), an impeller nut (2), a pump cover (3), an impeller mouth ring (4) and a pump shaft are arranged in the oil pump body. The pressure relief sleeve (1) is sleeved on the pump shaft. The inner diameter of the impeller mouth ring (4) on the left side is smaller than the inner diameter of the impeller mouth ring (4) on the right side. The installation mode of the oil pump body is horizontal centerline support. The flow passage part of the oil pump body adopts a double vortex chamber, and the flow passage is symmetrically arranged. The upper part and the lower part of the oil pump body are respectively provided with an exhaust hole and a drain hole. The oil pump body is provided with a suction port and a discharge port. The two impellers (5) of the oil pump body are symmetrically arranged. The residual axial force is balanced by a pair of back-to-back mounted ball bearings arranged at the free end. The rear cover plates of the two impeller (5) hubs are provided with a suction port and a balance hole (6) connected to the impeller. The total cross-sectional area of ​​all the balance holes (6) is greater than 5-6 times the cross-sectional area of ​​the sealing ring gap. The coupling of the oil pump body adopts a diaphragm extension coupling.

2. A heavy wax oil pump for a delayed coking device according to claim 1, characterized in that: The suction port and the discharge port of the oil pump body are both arranged vertically upward.

3. A heavy wax oil pump for a delayed coking device according to claim 2, characterized in that: The suction port and the discharge port of the oil pump body are cast integrally with the oil pump body.

4. A heavy wax oil pump for a delayed coking device according to claim 1, characterized in that: The pump cover (3) is connected to the oil pump body via bolts.

5. A heavy wax oil pump for a delayed coking device according to claim 1, characterized in that: The two impellers (5) are connected to the pump shaft of the oil pump body through an impeller nut (2).