Self-circulation cooling device and circulation cooling method for mechanical seal of multiphase multiphase pump

Abstract

The invention relates to the technical field of mechanical seal cooling, in particular to a self-circulation cooling device and method for a multi-phase multiphase pump mechanical seal, and the self-circulation cooling device for the multi-phase multiphase pump mechanical seal comprises a multi-phase multiphase pump and a liquid tank. A left end face mechanical sealing mechanism and a right end face mechanical sealing mechanism are arranged at the left end and the right end of the compression bin correspondingly, a left bearing and a right bearing are arranged at the left end and the right end of the pump shaft in a surrounding and supporting mode correspondingly, and a left bearing mechanical sealing mechanism and a right bearing mechanical sealing mechanism are arranged between the left bearing and the pump shell and between the right bearing and the pump shell correspondingly. A first cooling pipeline is arranged between the liquid tank and the right end face mechanical sealing mechanism, and a second cooling pipeline is communicated between the first cooling pipeline and the left end face mechanical sealing mechanism. All mechanical sealing mechanisms of the multiphase multiphase pump can be effectively and continuously cooled, operation is safe, cost input is low, and great safety guarantee and economic benefits are brought to oil and gas gathering and transportation enterprises.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical seal cooling, and is a self-circulation cooling device and a circulation cooling method for mechanical seal of a multiphase mixed conveying pump. BACKGROUND

[0002] In recent years, Xinjiang oilfield has carried out large-scale closed gathering and transportation process system for heavy oil exploitation. Due to the complexity of the closed gathering and transportation medium (high temperature, crude oil, water, sand, steam, natural gas, etc.), the comprehensive performance requirements of the conveying equipment are extremely high. Domestic conventional pumps, such as centrifugal pumps, plunger pumps and gear pumps, are not suitable for conveying such medium.

[0003] Generally, the leakage failure of the pump body is mainly due to the damage of the friction surface of the mechanical seal of the pump body due to long-term friction. The mechanical seal refers to a device for preventing fluid leakage, which is formed by at least one pair of end faces perpendicular to the rotation axis under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism and the cooperation of the auxiliary seal. The auxiliary seal of the compensation ring is a metal bellows, which is called bellows mechanical seal.

[0004] In order to ensure the operation of the oilfield closed gathering and transportation process system, single and double screw pumps are currently used, but they also struggle to support the closed gathering and transportation task. The pump body, rotor and mechanical seal mechanism of the double screw pump are easily worn under the sand-containing medium condition, and the average service life is about 3 months. The rubber stator of the single screw pump is easily softened and damaged at high temperature, and the average service life is 5 to 8 months. In order to maintain normal production of the oilfield, continuous maintenance and a large number of spare parts are needed to maintain the operation of the gathering and transportation process system. The short service life of single and double screw pumps, the difficulty, long duration and high cost of maintenance seriously affect the production and operation of the oilfield.

[0005] Therefore, Xinjiang oilfield has carried out a pilot test of using a blade type multiphase mixed conveying pump in the gathering and transportation process system. According to the field operation, the blade type multiphase mixed conveying pump can well solve the problems encountered by the single and double screw pumps. However, the high temperature wear between the mechanical seal mechanism of the blade type multiphase mixed conveying pump and the pump shaft directly affects the safe operation of the blade type multiphase mixed conveying pump, and in severe cases, it will cause the interruption of the oilfield gathering and transportation process system, causing great economic loss to the enterprise. SUMMARY

[0006] The present application provides a self-circulation cooling device and a circulation cooling method for mechanical seal of a multiphase mixed conveying pump, which overcomes the shortcomings of the prior art and effectively solves the problems of high failure rate and high maintenance cost of the mechanical seal mechanism of the pressurizing pump in the existing oil and gas field closed gathering and transportation system.

[0007] One of the technical solutions of the present application is realized by the following measures: a self-circulation cooling device of a mechanical seal of a multiphase mixed delivery pump, comprising a multiphase mixed delivery pump and a liquid tank, the multiphase mixed delivery pump comprising a motor, a pump shaft, bearings, a compression chamber and a pump shell, the motor being fixedly installed at the right end of the pump shaft, the compression chamber being provided with a left end face mechanical seal mechanism and a right end face mechanical seal mechanism at the left end and the right end respectively, the pump shaft being provided with a left bearing and a right bearing at the left end and the right end respectively, the left bearing and the right bearing being provided with a left bearing mechanical seal mechanism and a right bearing mechanical seal mechanism between the left bearing and the right bearing and the pump shell, the first liquid outlet of the lower part of the liquid tank being fixedly connected with the bottom liquid inlet of the right end face mechanical seal mechanism through a first cooling pipeline, the first cooling pipeline being fixedly connected with the bottom liquid inlet of the left end face mechanical seal mechanism through a second cooling pipeline, the first cooling pipeline between the first liquid outlet of the lower part of the liquid tank and the second cooling pipeline being fixedly connected with the bottom liquid inlet of the left bearing mechanical seal mechanism through a third cooling pipeline, the top liquid outlet of the left bearing mechanical seal mechanism being fixedly connected with the top liquid inlet of the right bearing mechanical seal mechanism through a fourth cooling pipeline, the top liquid outlet of the left end face mechanical seal mechanism being fixedly connected with the top first liquid inlet of the liquid tank through a first backflow pipeline, the top liquid outlet of the right end face mechanical seal mechanism being fixedly connected with the first backflow pipeline through a second backflow pipeline, and the bottom liquid outlet of the right bearing mechanical seal mechanism being fixedly connected with the first backflow pipeline between the second backflow pipeline and the top first liquid inlet of the liquid tank through a third backflow pipeline.

[0008] The following is a further optimization or / and improvement of one of the above-mentioned technical solutions: The left end face mechanical seal mechanism and the right end face mechanical seal mechanism are provided with a sealing packing box inside, the top inlet of the compression chamber is fixedly connected with a medium inlet pipeline, and the bottom outlet of the compression chamber is fixedly connected with a medium outlet pipeline.

[0009] The liquid tank is provided with a remote thermometer, a heater and a remote liquid level meter, the top of the liquid tank is provided with a second liquid inlet, the second liquid inlet is provided with a liquid adding filter, and the lower part of the liquid tank is fixedly connected with a liquid discharge pipeline.

[0010] The first cooling pipeline between the first liquid outlet of the lower part of the liquid tank and the third cooling pipeline is fixedly installed with a liquid outlet filter, a cooling pump, a first remote pressure gauge and a first flowmeter along the medium flow direction in sequence.

[0011] The first cooling pipeline between the top liquid outlet of the liquid tank, the cooling pump and the first remote pressure gauge is fixedly connected with a bypass circulation pipeline, and the bypass circulation pipeline is fixedly installed with a pressure control valve.

[0012] The device further comprises an energy accumulator, and the bottom outlet of the energy accumulator is fixedly connected with an energy storage pipeline between the first flowmeter and the first cooling pipeline of the third cooling pipeline.

[0013] The first cooling pipeline between the second cooling pipeline and the bottom liquid inlet of the right end face mechanical seal mechanism is sequentially fixedly installed with a second remote pressure gauge, a first regulating valve and a second flow meter in sequence along the medium flow direction, the second cooling pipeline is sequentially fixedly installed with a third remote pressure gauge, a second regulating valve and a third flow meter in sequence along the medium flow direction, and the third cooling pipeline is sequentially fixedly installed with a fourth remote pressure gauge, a third regulating valve and a fourth flow meter in sequence along the medium flow direction.

[0014] The first return pipeline between the top liquid outlet of the left end face mechanical seal mechanism and the second return pipeline, the second return pipeline and the third return pipeline are fixedly installed with a fourth regulating valve, a fifth regulating valve and a sixth regulating valve respectively, and the first return pipeline between the third return pipeline and the top first liquid inlet of the liquid tank is sequentially fixedly installed with a fifth remote pressure gauge, a fifth flow meter, an air cooler and a return filter in sequence along the medium flow direction.

[0015] The device further comprises a controller, and the motor, the remote temperature gauge, the heater, the remote liquid level gauge, the cooling pump, the first remote pressure gauge, the first flow meter, the pressure control valve, the second remote pressure gauge, the first regulating valve, the second flow meter, the third remote pressure gauge, the second regulating valve, the third flow meter, the fourth remote pressure gauge, the third regulating valve, the fourth flow meter, the fourth regulating valve, the fifth regulating valve, the sixth regulating valve, the fifth remote pressure gauge, the fifth flow meter, the air cooler and the return filter are electrically connected with the controller.

[0016] The second technical scheme of the application is realized by the following measures: a circulating cooling method of a self-circulating cooling device of a mechanical seal of a multiphase mixed delivery pump, which is performed according to the following steps: In the first step, clean water or emulsion is added into the liquid tank as the cooling liquid of the device, the cooling liquid in the liquid tank is filtered through the liquid outlet filter first, and then the filtered cooling liquid enters the right end face mechanical seal mechanism, the left end face mechanical seal mechanism and the left bearing mechanical seal mechanism through the first cooling pipeline, the second cooling pipeline and the third cooling pipeline respectively, so as to cool and lower the temperature of the mechanical seal friction surfaces in the three mechanical seal mechanisms; In the second step, the cooling liquid in the left bearing mechanical seal mechanism enters the right bearing mechanical seal mechanism through the fourth cooling pipeline, so as to cool and lower the temperature of the mechanical seal friction surface in the right bearing mechanical seal mechanism; In the third step, the cooling liquid in the left end face mechanical seal mechanism returns to the liquid tank through the first return pipeline, the cooling liquid in the right end face mechanical seal mechanism returns to the liquid tank through the second return pipeline and the first return pipeline in sequence, and the cooling liquid in the right bearing mechanical seal mechanism returns to the liquid tank through the third return pipeline and the first return pipeline in sequence; In the fourth step, the cooling liquid in the liquid tank enters the right end face mechanical seal mechanism, the left end face mechanical seal mechanism, the left bearing mechanical seal mechanism and the right bearing mechanical seal mechanism respectively for circulating cooling.

[0017] This invention can effectively cool down all mechanical seal mechanisms of multiphase mixed-transfer pumps, ensuring that all mechanical seal mechanisms work under optimal pressure and flow conditions, improving cooling and lubrication effects, reducing the risk of stress deformation or damage to the mechanical seal mechanism body due to lack of cooling source, and the invention is safe to operate, low in cost, and has a low failure rate, providing strong safety assurance for oil and gas gathering and transportation companies. Attached Figure Description

[0018] Appendix Figure 1 This is a schematic diagram of the front half-section structure of the present invention.

[0019] Appendix Figure 2 For the appendix Figure 1 A cross-sectional view of the mechanical seal mechanism on the right end face.

[0020] Appendix Figure 3 For the appendix Figure 1 A cross-sectional view of the mechanical seal mechanism on the left end face.

[0021] Appendix Figure 4 For the appendix Figure 1 A cross-sectional view of the mechanical seal mechanism of the left bearing in the diagram.

[0022] Appendix Figure 5 For the appendix Figure 1 A cross-sectional view of the mechanical seal mechanism of the right bearing in the diagram.

[0023] The codes in the attached diagram are as follows: 1 for multiphase mixing pump, 2 for liquid tank, 3 for motor, 4 for pump shaft, 5 for compression chamber, 6 for pump casing, 7 for left end face mechanical seal mechanism, 8 for right end face mechanical seal mechanism, 9 for left bearing, 10 for right bearing, 11 for left bearing mechanical seal mechanism, 12 for right bearing mechanical seal mechanism, 13 for first cooling line, 14 for second cooling line, 15 for third cooling line, 16 for fourth cooling line, 17 for first return line, 18 for second return line, 19 for third return line, 20 for sealing stuffing box, 21 for gathering and transporting medium inlet line, 22 for gathering and transporting medium outlet line, 23 for remote thermometer, 24 for heater, 25 for remote level gauge, and 26 for second inlet... 27 is the liquid inlet, 28 is the liquid inlet filter, 29 is the liquid outlet filter, 30 is the cooling pump, 31 is the first remote pressure gauge, 32 is the first flow meter, 33 is the accumulator, 34 is the accumulator line, 35 is the second remote pressure gauge, 36 is the first regulating valve, 37 is the second flow meter, 38 is the third remote pressure gauge, 39 is the second regulating valve, 40 is the third flow meter, 41 is the fourth remote pressure gauge, 42 is the third regulating valve, 43 is the fourth flow meter, 44 is the fourth regulating valve, 45 is the fifth regulating valve, 46 is the sixth regulating valve, 47 is the fifth flow meter, 48 is the air cooler, 49 is the return filter, 50 is the bypass circulation line, 51 is the pressure control valve, and 52 is the fifth remote pressure gauge. Detailed Implementation

[0024] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0025] The present invention will be further described below with reference to embodiments: Example 1: As shown in the attached document Figure 1 , 2As shown in Figures 3, 4, and 5, the self-circulating cooling device for the mechanical seal of the multiphase mixed-transfer pump is characterized by comprising a multiphase mixed-transfer pump 1 and a liquid tank 2. The multiphase mixed-transfer pump 1 includes a motor 3, a pump shaft 4, a compression chamber 5, and a pump casing 6. The motor 3 is fixedly installed on the right end of the pump shaft 4. A left end face mechanical seal mechanism 7 and a right end face mechanical seal mechanism 8 are fixedly installed on the left and right ends of the compression chamber 5, respectively. A left bearing 9 and a right bearing 10 are respectively arranged around and supported on the left and right ends of the pump shaft 4. A left bearing mechanical seal mechanism 11 and a right bearing mechanical seal mechanism 12 are fixedly installed between the left bearing 9 and the right bearing 10 and the pump casing 6, respectively. A first cooling pipeline 13 is fixed between the first liquid outlet at the bottom of the liquid tank 2 and the bottom liquid inlet of the right end face mechanical seal mechanism 8. The first cooling pipeline 13 is fixedly connected to the bottom liquid inlet of the left end face mechanical seal mechanism 7. A second cooling pipe 14 is provided. A first cooling pipe 13 between the first outlet at the bottom of the liquid tank 2 and the second cooling pipe 14 is fixedly connected to a third cooling pipe 15 between the bottom inlet of the left bearing mechanical seal mechanism 11. A fourth cooling pipe 16 is fixedly connected between the top outlet of the left bearing mechanical seal mechanism 11 and the top inlet of the right bearing mechanical seal mechanism 12. A first return pipe 17 is fixedly connected between the top outlet of the left end mechanical seal mechanism 7 and the first inlet at the top of the liquid tank 2. A second return pipe 18 is fixedly connected between the top outlet of the right end mechanical seal mechanism 8 and the first return pipe 17. A third return pipe 19 is fixedly connected between the bottom outlet of the right bearing mechanical seal mechanism 12, the second return pipe 18, and the first return pipe 17 between the top inlet of the liquid tank 2.

[0026] Example 2: As an optimization of the above examples, as shown in the appendix Figure 1 As shown, both the left end mechanical seal mechanism 7 and the right end mechanical seal mechanism 8 are equipped with sealing packing glands 20. The top inlet of the compression chamber 5 is fixedly connected to the collecting and transporting medium inlet pipeline 21, and the bottom outlet of the compression chamber 5 is fixedly connected to the collecting and transporting medium outlet pipeline 22.

[0027] As needed, in addition to the sealing packing gland 20, the mechanical seal mechanism 11 of the left bearing and the mechanical seal mechanism 12 of the right bearing also include other mechanical seal components.

[0028] As needed, gaseous or liquid media enter the compression chamber 5 through the gathering and transportation media inlet pipeline 21. Through the rotation of the blades on the pump shaft 4, the gaseous or liquid media is pressurized and input into the gathering and transportation media outlet pipeline 22. The gaseous or liquid media is then input to each gas or oil system through the gathering and transportation media outlet pipeline 22.

[0029] Example 3: As an optimization of the above examples, as shown in the appendix Figure 1As shown, a remote thermometer 23, a heater 24, and a remote level gauge 25 are fixedly installed on the liquid tank 2. A second liquid inlet 26 is provided on the top of the liquid tank 2, and a liquid filter 27 is provided on the second liquid inlet 26. A drain pipe 28 is fixedly connected to the second liquid outlet at the bottom of the liquid tank 2.

[0030] As needed, heater 24 can heat the cooling medium in liquid tank 2 in a timely manner. On the one hand, this can reduce the precipitation of solid salts in the cooling medium and avoid the risk of blockage of the circulating cooling channel caused by a large amount of solid salts adhering to the pipelines and equipment of the device. On the other hand, it can avoid the risk of freezing blockage of the circulating cooling medium when the device is operating in extremely cold environments.

[0031] As needed, the remote thermometer 23 can monitor the temperature of the medium stored in the liquid tank 2 in real time, and the remote level gauge 25 can monitor the liquid level of the medium stored in the liquid tank 2 in real time. The real-time liquid level value in the liquid tank 2 shall not be lower than 75% of the total liquid level height in the liquid tank 2. When the liquid level and temperature of the medium stored in the liquid tank 2 do not meet the process parameter requirements of the device, it is necessary to fill the tank or cool it down in time.

[0032] As needed, the liquid addition filter 27 is a 150LB model, which can be used not only for liquid addition filtration, but also for filtering outside air impurities after liquid addition is completed, so as to prevent outside air impurities from entering the liquid tank 2.

[0033] Example 4: As an optimization of the above embodiments, as shown in the appendix Figure 1 As shown, a liquid outlet filter 29, a cooling pump 30, a first remote pressure gauge 31, and a first flow meter 32 are sequentially fixedly installed on the first cooling pipeline 13 between the first liquid outlet at the lower part of the liquid tank 2 and the third cooling pipeline 15 along the medium flow direction.

[0034] As required, the liquid outlet filter 29 is a Y-type filter. The liquid outlet filter 29 can effectively filter out impurities in the circulating cooling medium of the device, reducing the risk of blockage in the pipelines and equipment inlet and outlet of the device.

[0035] The flow rate of cooling pump 30 can reach 5m³ / h as needed. 3 / h, a cable is fixedly connected between the motor 3 and the cooling pump 30, and a frequency converter is fixedly installed on the cable, which makes full use of the output power of the motor 3, improves the energy utilization rate, and also simplifies the layout space of the device.

[0036] Example 5: As an optimization of the above embodiments, as shown in the appendix Figure 1 As shown, a bypass circulation line 50 is fixedly connected between the liquid outlet at the top of the liquid tank 2 and the first cooling pipeline 13 between the cooling pump 30 and the first remote pressure gauge 31. A pressure control valve 51 is fixedly installed on the bypass circulation line 50.

[0037] As needed, the pressure control valve 51 can indirectly regulate and protect the flow and pressure of the first cooling pipeline 13, reducing the probability of the device malfunctioning and increasing the safety of the circulating cooling process system. When the device is running, the working pressure of the cooling medium in the bypass circulation pipeline 50 is maintained at 1.6MPa by adjusting the pressure control valve 51.

[0038] Example 6: As an optimization of the above embodiments, as shown in the appendix Figure 1 As shown, the device also includes an energy storage device 33, and an energy storage pipeline 34 is fixedly connected between the bottom outlet of the energy storage device 33 and the first cooling pipeline 13 between the first flow meter 32 and the third cooling pipeline 15.

[0039] Depending on the requirements, the accumulator 33 can be of various structural types, such as diaphragm type, piston type, etc. The accumulator 33 not only eliminates pressure pulsations of the cooling medium in the pipelines and equipment, reducing cooling medium flow noise, but also reduces the erosion damage caused by the circulating cooling medium to vulnerable parts of the pipelines and equipment. Furthermore, in the event of a power outage or motor 3 failure, the accumulator 33 can serve as an emergency energy source to ensure the normal circulation of the cooling medium in the device.

[0040] Example 7: As an optimization of the above embodiments, as shown in the appendix Figure 1 As shown, a second remote pressure gauge 35, a first regulating valve 36, and a second flow meter 37 are sequentially fixedly installed on the first cooling pipeline 13 between the second cooling pipeline 14 and the bottom liquid inlet of the mechanical seal mechanism 8 on the right end face, along the direction of medium flow. A third remote pressure gauge 38, a second regulating valve 39, and a third flow meter 40 are sequentially fixedly installed on the second cooling pipeline 14 along the direction of medium flow. A fourth remote pressure gauge 41, a third regulating valve 42, and a fourth flow meter 43 are sequentially fixedly installed on the third cooling pipeline 15 along the direction of medium flow.

[0041] As required, since the medium outlet pressure at the bottom right end of the compression chamber 5 is higher than the medium inlet pressure at the top left end, the axial pressure at the right end of the compression chamber 5 is higher than that at the left end. Therefore, the wear and leakage failure rate of the mechanical seal mechanism 8 at the right end is higher than that of the mechanical seal mechanism 7 at the left end. When the device is running, the operating parameters of the second remote pressure gauge 35 and the second flow meter 37 are higher than those of the third remote pressure gauge 38 and the third flow meter 40, ensuring that more cooling medium flow is given to the mechanical seal mechanism 8 at the right end, so as to achieve an effective cooling effect.

[0042] Example 8: As an optimization of the above embodiments, as shown in the appendix Figure 1As shown, a fourth regulating valve 44, a fifth regulating valve 45, and a sixth regulating valve 46 are respectively fixedly installed on the first return pipeline 17, the second return pipeline 18, and the third return pipeline 19 between the top liquid outlet of the mechanical seal mechanism 7 on the left end face and the second return pipeline 18. A fifth remote pressure gauge 52, a fifth flow meter 47, an air cooler 48, and a return filter 49 are fixedly installed sequentially along the medium flow direction on the first return pipeline 17 between the third return pipeline 19 and the first liquid inlet on the top of the liquid tank 2.

[0043] As needed, the air cooler 48 can cool the return medium in the first return pipeline 17 in real time, thereby ensuring that the circulating cooling medium in the device is kept at a low temperature in real time, and improving the cooling effect on the left end mechanical seal mechanism 7, the right end mechanical seal mechanism 8, the left bearing mechanical seal mechanism 11, and the right bearing mechanical seal mechanism 12.

[0044] As required, the model of the reflux filter 49 is RMHF-P050-40EP. The reflux filter 49 not only has a filtration function but also a signal acquisition function. When the outlet pressure drop of the reflux filter 49 is too large, it will automatically sound an alarm, at which point the filter element inside the reflux filter 49 needs to be replaced promptly. The accuracy of the reflux filter 49 is higher than that of the outlet filter 29, and the accuracy of the fifth flow meter 47 is higher than that of the first flow meter 32.

[0045] Example 9: As an optimization of the above embodiments, as shown in the appendix Figure 1 As shown, it also includes a controller, motor 3, remote thermometer 23, heater 24, remote level gauge 25, cooling pump 30, first remote pressure gauge 31, first flow meter 32, pressure control valve 53, second remote pressure gauge 35, first regulating valve 36, second flow meter 37, third remote pressure gauge 38, second regulating valve 39, third flow meter 40, fourth remote pressure gauge 41, third regulating valve 39, fourth flow meter 43, fourth regulating valve 44, fifth regulating valve 45, sixth regulating valve 46, fifth remote pressure gauge 52, fifth flow meter 47, air cooler 48, and return filter 49, all of which are electrically connected to the controller.

[0046] Example 10: As an optimization of the above embodiments, as shown in the appendix Figure 1As shown, a circulating cooling method for a self-circulating cooling device of a multiphase mixed-transfer pump mechanical seal is carried out according to the following steps: First, clean water or emulsion is added to the liquid tank 2 as the coolant for the device. The coolant in the liquid tank 2 is first filtered through the outlet filter 29, and the filtered coolant then enters the right end face mechanical seal mechanism 8, the left end face mechanical seal mechanism 7, and the left bearing mechanical seal mechanism 11 through the first cooling pipeline 13, the second cooling pipeline 14, and the third cooling pipeline 15, respectively. The coolant cools the friction surfaces of the mechanical seals in the right end face mechanical seal mechanism 8, the left end face mechanical seal mechanism 7, and the left bearing mechanical seal mechanism 11. During this process, the accumulator 33 reduces the pressure pulsation and flow noise of the cooling medium in the first cooling pipeline 13, and also provides circulation power to the cooling medium flowing in the first cooling pipeline 13. Second, the coolant in the left bearing mechanical seal mechanism 11 enters the right bearing mechanical seal mechanism 11 through the fourth cooling pipeline 16. In the sealing mechanism 12, the coolant cools the friction surface of the mechanical seal in the right bearing mechanical seal mechanism 12. In the third step, the coolant in the left end mechanical seal mechanism 7 flows back to the liquid tank 2 through the first return line 17, the coolant in the right end mechanical seal mechanism 8 flows back to the liquid tank 2 through the second return line 18 and the first return line 17 in sequence, and the coolant in the right bearing mechanical seal mechanism 12 flows back to the liquid tank 2 through the third return line 19 and the first return line 17 in sequence. During this process, the air cooler 48 cools the return cooling medium in the first return line 17, and the return filter 49 filters the return cooling medium in the first return line 17 to ensure that the coolant returning to the liquid tank 2 is at a low temperature and free of impurities. In the fourth step, the coolant in the liquid tank 2 then enters the right end mechanical seal mechanism 8, the left end mechanical seal mechanism 7, the left bearing mechanical seal mechanism 11, and the right bearing mechanical seal mechanism 12 for circulation cooling.

[0047] Unless otherwise specified, all equipment and devices used in this invention are existing and commonly known in the art.

[0048] Depending on the needs, the pipelines and equipment of the self-circulating cooling device for the mechanical seal of this multiphase mixed-transfer pump can also be equipped with conventional valves, thermometers, and pressure gauges known in the art, according to production requirements. The controller is a DCS controller, model CMRC-JS-3-220.

[0049] In summary, this invention can effectively cool and reduce the temperature of all mechanical seal mechanisms in a multiphase mixed-transfer pump, ensuring that all mechanical seal mechanisms operate under optimal pressure and flow conditions. It improves cooling and lubrication effects, reduces the risk of stress deformation or damage to the mechanical seal mechanism body due to lack of cooling source, and provides a strong safety guarantee for oil and gas gathering and transportation enterprises.

[0050] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A self-circulating cooling device for mechanical seals of multiphase mixed flow pumps, characterized in that The utility model provides a kind of multi-phase mixed pump, liquid tank, the multi-phase mixed pump includes motor, pump shaft, bearing, compression bin, pump shell, and the right end of pump shaft is fixedly installed with motor, and the left end and right end of compression bin are respectively provided with left end face mechanical seal mechanism, right end face mechanical seal mechanism, and the left end and right end of pump shaft are respectively supported and are provided with left bearing, right bearing, and left bearing and right bearing are provided with left bearing mechanical seal mechanism, right bearing mechanical seal mechanism between pump shell, and the first cooling pipeline between the first liquid outlet of liquid tank lower part and the bottom liquid inlet of right end face mechanical seal mechanism is fixed, and the first cooling pipeline between the first liquid outlet of liquid tank lower part and the bottom liquid inlet of left end face mechanical seal mechanism is fixedly connected with second cooling pipeline, and the first cooling pipeline between the first liquid outlet of liquid tank lower part and second cooling pipeline is fixedly connected with third cooling pipeline between the bottom liquid inlet of left bearing mechanical seal mechanism, and the fourth cooling pipeline is fixedly connected between the top liquid outlet of left bearing mechanical seal mechanism and the top liquid inlet of right bearing mechanical seal mechanism, and the first return pipeline is fixedly connected between the top liquid outlet of left end face mechanical seal mechanism and the top first liquid inlet of liquid tank, and the second return pipeline is fixedly connected between the top liquid outlet of right end face mechanical seal mechanism and first return pipeline, and the third return pipeline is fixedly connected between the bottom liquid outlet of right bearing mechanical seal mechanism and the first return pipeline between second return pipeline and the top first liquid inlet of liquid tank.

2. The self-circulating cooling device for a mechanical seal of a multiphase mixed-flow pump according to claim 1, characterized in that Left end face mechanical seal mechanism and right end face mechanical seal mechanism are provided with sealing packing box inside, and the top inlet of compression bin is fixedly connected with medium inlet pipeline, and the bottom outlet of compression bin is fixedly connected with medium outlet pipeline.

3. A self-circulating cooling device for a mechanical seal of a multiphase mixed-flow pump according to claim 1 or 2, characterized in that Remote thermometer, heater, remote liquid level meter are respectively fixedly arranged on the liquid tank, and the second liquid inlet is arranged on the top of the liquid tank, and the liquid inlet filter is arranged on the second liquid inlet, and the liquid discharge pipeline is fixedly connected with the second liquid outlet of the lower part of the liquid tank.

4. A self-circulating cooling device for a mechanical seal of a multiphase mixed-flow pump according to claim 1 or 2 or 3, characterized in that The first cooling pipeline between the first liquid outlet of the lower part of the liquid tank and the third cooling pipeline is fixedly installed with liquid discharge filter, cooling pump, first remote pressure gauge, first flowmeter along the direction of medium flow.

5. The self-circulating cooling arrangement for a mechanical seal of a multiphase mixed-flow pump according to claim 4, characterized in that The bypass circulation pipeline is fixedly connected between the first cooling pipeline between the top liquid outlet of the liquid tank and the cooling pump and the first remote pressure gauge, and the pressure control valve is fixedly installed on the bypass circulation pipeline.

6. A self-circulating cooling device for a mechanical seal of a multiphase mixed-flow pump according to claim 4 or 5, characterized in that It also includes an accumulator, and the accumulator bottom outlet is fixedly connected with the first cooling pipeline between the first flowmeter and the third cooling pipeline.

7. The self-circulating cooling arrangement for a mechanical seal of a multiphase mixed-flow pump according to claim 6, characterized in that The first cooling pipeline between the second cooling pipeline and the bottom liquid inlet of right end face mechanical seal mechanism is fixedly installed with second remote pressure gauge, first regulating valve, second flowmeter along the direction of medium flow, and the second cooling pipeline is fixedly installed with third remote pressure gauge, second regulating valve, third flowmeter along the direction of medium flow, and the third cooling pipeline is fixedly installed with fourth remote pressure gauge, third regulating valve, fourth flowmeter along the direction of medium flow.

8. The self-circulating cooling arrangement for a mechanical seal of a multiphase mixed-flow pump according to claim 7, characterized in that The first return pipeline between the top liquid outlet of the left end face mechanical seal mechanism and the second return pipeline, the second return pipeline and the third return pipeline are respectively fixedly installed with a fourth regulating valve, a fifth regulating valve and a sixth regulating valve, and the first return pipeline between the third return pipeline and the top first liquid inlet of the liquid tank is sequentially fixedly installed with a fifth remote pressure gauge, a fifth flowmeter, an air cooler and a return filter along the medium flow direction.

9. The self-circulating cooling arrangement for a mechanical seal of a multiphase mixed-flow pump according to claim 8, characterized in that The controller, the motor, the remote thermometer, the heater, the remote liquid level gauge, the cooling pump, the first remote pressure gauge, the first flowmeter, the pressure control valve, the second remote pressure gauge, the first regulating valve, the second flowmeter, the third remote pressure gauge, the second regulating valve, the third flowmeter, the fourth remote pressure gauge, the third regulating valve, the fourth flowmeter, the fourth regulating valve, the fifth regulating valve, the sixth regulating valve, the fifth remote pressure gauge, the fifth flowmeter, the air cooler and the return filter are electrically connected with the controller.

10. A method of circulating cooling according to the apparatus of any one of claims 1 to 9, characterized by The following steps are performed: In the first step, clean water or emulsion is added into the liquid tank as the cooling liquid of the device. The cooling liquid in the liquid tank is filtered through the liquid outlet filter first, and then the filtered cooling liquid enters the right end face mechanical seal mechanism, the left end face mechanical seal mechanism and the left bearing mechanical seal mechanism through the first cooling pipeline, the second cooling pipeline and the third cooling pipeline respectively, so as to cool and lower the temperature of the mechanical seal friction surfaces in the three mechanical seal mechanisms; In the second step, the cooling liquid in the left bearing mechanical seal mechanism enters the right bearing mechanical seal mechanism through the fourth cooling pipeline, so as to cool and lower the temperature of the mechanical seal friction surface in the right bearing mechanical seal mechanism; In the third step, the cooling liquid in the left end face mechanical seal mechanism returns to the liquid tank through the first return pipeline, the cooling liquid in the right end face mechanical seal mechanism returns to the liquid tank through the second return pipeline and the first return pipeline in sequence, and the cooling liquid in the right bearing mechanical seal mechanism returns to the liquid tank through the third return pipeline and the first return pipeline in sequence; In the fourth step, the cooling liquid in the liquid tank enters the right end face mechanical seal mechanism, the left end face mechanical seal mechanism, the left bearing mechanical seal mechanism and the right bearing mechanical seal mechanism respectively for circulating cooling.

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