Novel fracturing plunger pump power end lubricating system

Abstract

The utility model discloses a novel fracturing plunger pump power end lubricating system which comprises a lubricating oil tank, an oil return port of the lubricating oil tank is communicated with an oil outlet of a plunger pump power end through an oil return pipe; an oil inlet of the first oil pump is communicated with a first oil outlet of the lubricating oil tank, and an oil outlet of the first oil pump is communicated with an oil inlet of the power end of the plunger pump through a second oil inlet pipe; an oil inlet of the oil product monitoring device is communicated with the second oil inlet pipe through a first sampling pipe, and an oil outlet of the oil product monitoring device is communicated with the oil return pipe through a second sampling pipe; the water removal and purification device comprises a second oil pump, and an oil inlet of the second oil pump is communicated with a second oil outlet of the lubricating oil tank; the input end of the water and impurity removal filter communicates with the oil outlet of the second oil pump, and the output end of the water and impurity removal filter communicates with the oil inlet of the lubricating oil tank. According to the utility model, the functions of oil product monitoring, lubrication, water removal and purification are added in the original lubrication system, so that the oil product state of the lubrication system is monitored in real time, and the oil liquid in the system can be automatically subjected to water removal and purification according to the monitored data.

Description

Technical Field

[0001] The utility model relates to the field of fracturing equipment, and more specifically, to a novel lubrication system for the power end of a fracturing plunger pump. Background Art

[0002] During the fracturing operation of oil and gas wells, the function of the fracturing equipment is to pressurize the working fluid, and its core component is the fracturing plunger pump. In order to ensure the working performance of the fracturing plunger pump, a lubrication system is usually provided, which pumps lubricating oil through the lubrication pump to force lubrication of the plunger pump, and cooperates with a simple oil filter assembly to filter impurities in the lubricating oil. However, in the actual working process, water vapor and impurities in the air can easily enter the plunger pump housing. After combining with the lubricating oil, it will cause problems such as emulsification and contamination of the lubricating oil. Especially for harsh on-site environmental conditions and poor working conditions, the quality of the lubricating oil will directly affect the normal operation of the fracturing plunger pump, and then affect the working reliability and durability of the equipment. The conventional fracturing plunger pump lubrication system mainly considers the lubrication function, and cannot judge and control the state of the lubricating oil in real time. There is a risk of failure and shutdown of the fracturing plunger pump during operation.

[0003] In order to solve the above problems, it is necessary to design a new type of fracturing plunger pump power end lubrication system to effectively monitor and dewater the lubricating oil while ensuring lubrication efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide a new type of fracturing plunger pump power end lubrication system, which adds the functions of oil monitoring and water removal and purification to the original lubrication system, ensures that the oil status of the lubrication system is under real-time monitoring, and can automatically remove water and purify the oil in the system according to the monitoring data, thereby solving the problem that the existing lubrication system has poor adaptability to complex working conditions and cannot ensure the long-term stable operation of the fracturing plunger pump.

[0005] In order to achieve these purposes and other advantages according to the utility model, a novel fracturing plunger pump power end lubrication system is provided, comprising:

[0006] A lubricating oil tank, whose oil return port is connected to the oil outlet of the power end of the plunger pump through an oil return pipe;

[0007] a first oil pump, whose oil inlet is connected to the first oil outlet of the lubricating oil tank through a first oil inlet pipe, and whose oil outlet is connected to the oil inlet of the power end of the plunger pump through a second oil inlet pipe;

[0008] An oil quality monitoring device, whose oil inlet is connected to the second oil inlet pipe through a first sampling pipe, and whose oil outlet is connected to the oil return pipe through a second sampling pipe, and the oil quality monitoring device is configured to detect the property parameters of the oil and the parameters of the particles in the oil;

[0009] A water removal and purification device, comprising a second oil pump, whose oil inlet is connected to the second oil outlet of the lubricating oil tank through a first purification pipe; a water removal and impurity removal filter, whose input end is connected to the oil outlet of the second oil pump, and whose output end is connected to the oil inlet of the lubricating oil tank through a second purification pipe;

[0010] A controller is electrically connected to the oil product monitoring device and the water removal and purification device.

[0011] Preferably, the novel fracturing plunger pump power end lubrication system further includes an oil filter, which is arranged on the second oil inlet pipe and located between the connection node between the first sampling pipe and the second oil inlet pipe and the oil outlet of the first oil pump.

[0012] Preferably, in the lubrication system of the power end of the novel fracturing plunger pump, a one-inlet-two-outlet three-way valve is provided at the connection node between the first sampling pipe and the second oil inlet pipe, the inlet of which is connected to the oil outlet of the first oil pump, and the two outlets are respectively connected to the oil inlet of the power end of the plunger pump and the oil quality monitoring device; a two-inlet-one-outlet three-way valve is provided at the connection node between the second sampling pipe and the oil return pipe, the two inlets of which are respectively connected to the oil outlet of the power end of the plunger pump and the oil quality monitoring device, and the outlet is connected to the oil return port of the lubricating oil tank.

[0013] Preferably, in the new fracturing plunger pump power end lubrication system, the first oil outlet and the oil return port of the lubricating oil tank are relatively arranged on both sides of the upper part of the tank body, and the second oil outlet and the oil inlet are relatively arranged on both sides of the lower part of the tank body, the first oil outlet and the oil inlet are located on the same side of the tank body, and the second oil outlet and the oil return port are located on the same side of the tank body.

[0014] Preferably, in the power end lubrication system of the novel fracturing plunger pump, the oil monitoring device comprises a monitoring pipeline, both ends of which are respectively connected to the first sampling tube and the second sampling tube; an oil detection sensor and a particle detection sensor are arranged at intervals on the monitoring pipeline, the oil detection sensor is arranged to detect the viscosity, density, water activity, water content, dielectric constant and temperature of the oil, and the particle detection sensor is arranged to detect the content of wear particles in the oil and the degree of oil contamination.

[0015] Preferably, in the novel fracturing plunger pump power end lubrication system, the oil product monitoring device further comprises a pressure reducing valve and a flow regulating valve, which are arranged at intervals on one end of the monitoring pipeline close to the first sampling pipe.

[0016] Preferably, in the power end lubrication system of the new fracturing plunger pump, the water removal and purification device also includes a pressure gauge and an electric transmitter, which are arranged at the input end of the water removal and impurity removal filter, the pressure gauge is configured to detect the liquid pressure of the input pipe port of the water removal and impurity removal filter, and the electric transmitter is electrically connected to the pressure gauge and the controller; a relief valve, whose liquid inlet and liquid outlet are respectively connected to the oil outlet and oil inlet of the second oil pump.

[0017] The utility model at least has the following beneficial effects:

[0018] The utility model is based on the original lubrication system and is equipped with an oil monitoring device and a water removal and purification device, so that the oil status in the lubrication system is always under real-time monitoring, and when the lubricating oil performance is lower than the set threshold, the controller can quickly respond to the monitoring data and start the water removal and purification device to automatically remove water from the oil in the system, so that the lubricating oil acting on the power end of the pressure plunger pump is in a high-quality state for a long time, ensuring the lubrication efficiency and lubrication effect, and solving the problem that the existing lubrication system has poor adaptability to complex working conditions and cannot ensure the long-term stable operation of the fracturing plunger pump.

[0019] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a novel fracturing plunger pump power end lubrication system according to one embodiment of the utility model;

[0021] Figure 2 is a schematic diagram of the structure of the oil product monitoring device described in the above embodiment;

[0022] Figure 3 It is a schematic diagram of the structure of the water removal and purification device described in the above embodiment.

[0023] Description of reference numerals:

[0024] 1. Plunger pump power end; 2. Lubricating oil tank; 3. First oil pump; 4. Oil filter; 5. Oil monitoring device; 51. Monitoring pipeline; 52. Oil detection sensor; 53. Particle detection sensor; 54. Pressure reducing valve; 55. Flow regulating valve; 6. Water removal and purification device; 61. Second oil pump; 62. Water removal and impurity removal filter; 63. Overflow valve; 64. Pressure gauge; 65. Electric transmitter; 7. Controller; 8. First oil inlet pipe; 9. Second oil inlet pipe; 10. Oil return pipe; 11. First sampling pipe; 12. Second sampling pipe; 13. First purification pipe; 14. Second purification pipe; 15. Control signal line. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0026] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0027] like Figure 1-3 As shown, the utility model provides a new type of fracturing plunger pump power end lubrication system, including:

[0028] The lubricating oil tank 2, whose oil return port is connected with the oil outlet of the plunger pump power end 1 through the oil return pipe 10;

[0029] A first oil pump 3, whose oil inlet is connected to the first oil outlet of the lubricating oil tank 2 through a first oil inlet pipe 8, and whose oil outlet is connected to the oil inlet of the plunger pump power end 1 through a second oil inlet pipe 9;

[0030] An oil quality monitoring device 5, whose oil inlet is connected to the second oil inlet pipe 9 through a first sampling pipe 11, and whose oil outlet is connected to the oil return pipe 10 through a second sampling pipe 12, and the oil quality monitoring device 5 is configured to detect the property parameters of the oil and the parameters of the particles in the oil;

[0031] The water removal and purification device 6 comprises a second oil pump 61, whose oil inlet is connected to the second oil outlet of the lubricating oil tank 2 through a first purification pipe 13; a water removal and impurity removal filter 62, whose input end is connected to the oil outlet of the second oil pump 61, and whose output end is connected to the oil inlet of the lubricating oil tank 2 through a second purification pipe 14;

[0032] The controller 7 is electrically connected to the oil product monitoring device 5 and the water removal and purification device 6 .

[0033] In the above technical solution, the lubricating oil tank 2 is provided with two outlets (first oil outlet and second oil outlet) and two inlets (return oil port and oil inlet). The lubricating system mainly includes two groups of oil circulation loops, one group of oil circulation loops corresponds to the first oil outlet and the return oil port, and is used for the normal supply of lubricating oil to the plunger pump power end 1. The oil is driven by the first oil pump 3 in the circulation loop and passes through the first oil inlet pipe 8, the second oil inlet pipe 9 and the return oil pipe 10 in sequence; the other group of oil circulation loops corresponds to the second oil outlet and the oil inlet, and is used for the dewatering and purification device 6 to dewater and purify the oil in the lubricating oil tank 2. The oil is driven by the second oil pump 61 in the circulation loop and passes through the first purification pipe 13 and the second purification pipe 14 in sequence. The lubricating system is also provided with pipelines for oil quality monitoring (first sampling pipe 11 and second sampling pipe 12), which are connected in parallel on both sides of the plunger pump power end 1 to detect the quality of the oil entering the plunger pump power end more accurately and in real time. The corresponding oil inlets and outlets of the above two sets of oil circulation loops on the lubricating oil tank 2 are independent of each other, so that the oil monitoring and water removal and purification functions can be adaptively integrated into the lubrication system without affecting the implementation efficiency of its original lubrication function and ensuring the implementation effect of the lubrication function.

[0034] Specifically, the working principle of the lubrication system of the power end of the novel fracturing plunger pump is as follows: when the plunger pump starts working, the lubrication function of the lubrication system is started synchronously, that is, the first oil pump 3 works, driving the lubricating oil in the lubricating oil tank 2 to move along a group of oil circulation loops corresponding to the first oil outlet and the return oil port of the lubricating oil tank 2. In this process, when the lubricating oil passes through the connection node between the second oil inlet pipe 9 and the first sampling pipe 11, it will automatically be diverted and flow into the first sampling pipe 11 under the action of the oil pressure in the pipe, and after passing through the entire oil quality monitoring device 5, it is merged into the main circulation loop (return oil pipe 10) through the second sampling pipe 12, that is, the online monitoring function of the oil quality is realized at the same time. The real-time detection data obtained by the oil monitoring device 5 is fed back to the controller 7 through the control signal line 15. The controller 7 judges and warns a variety of control indicators according to preset control thresholds. The control indicators include the water content of the oil, the particulate matter content, etc. When the water content or the impurity particle content in the oil exceeds the set threshold range, the controller 7 issues a warning and controls the water removal and purification device 6 to work according to the corresponding warning data, that is, the second oil pump 61 starts to work, driving the lubricating oil in the lubricating oil tank 2 to move along a group of oil circulation loops corresponding to the second oil outlet and oil inlet of the lubricating oil tank 2. The lubricating oil enters the water removal and impurity removal filter 62 through the first purification pipe 13 for filtration, and the purified oil flows back to the lubricating oil tank 2 through the second purification pipe 14. The controller 7 can divide the warning level according to the degree to which the detection data exceeds the control threshold. When the warning level is not high, the two groups of oil circulation loops work at the same time, that is, the oil is purified without affecting the normal lubrication work of the lubrication system; after a period of time, if the oil pollution situation is effectively controlled and each control index returns to the set threshold range, the water removal and purification device 6 can be shut down; if the oil pollution situation continues to worsen to the warning level exceeding the range allowing the normal operation of the lubrication system, it is necessary to shut down the first oil pump 3 and / or the fracturing plunger pump to prevent heavily contaminated oil from continuing to enter the fracturing plunger pump and affecting its normal operation, and then perform oil change, maintenance and other operations on the lubrication system and the fracturing plunger pump.

[0035] In this embodiment, the oil monitoring device can use a multifunctional oil sensor to detect various property indicators of the oil; the water removal and impurity removal filter can use cellulose with hydrophilic water absorption characteristics as the filter element material to filter impurities such as water and iron filings in the oil. In this embodiment, the filter element of the water removal and impurity removal filter has a dirt holding capacity of 2500g and a water absorption capacity of 780ml. The controller 7 is connected to the oil monitoring device 5 and the water removal and purification device 6 through the control signal line 15, and bidirectional signal transmission between the controller 7 and the oil monitoring device 5 and the water removal and purification device 6 can be realized.

[0036] The existing fracturing plunger pump lubrication system simply pumps lubricating oil through the lubrication pump to force lubricate the plunger pump, and at the same time filters the impurities in the lubricating oil through conventional coarse filter components such as oil filters, and cannot monitor the state of the lubricating oil in real time, and the quality of the filtered oil cannot be guaranteed. There are risks such as lubricating oil and condensed water emulsification, and fine wear particles mixed into the lubricating oil to cause pollution, which in turn affects the working reliability and durability of the fracturing plunger pump. On the basis of the original lubrication system, the utility model adds an oil monitoring device and a water removal and purification device, and integrates and controls its control signals, so that the lubrication system has the functions of oil monitoring and water removal and purification. The oil state of the lubrication system is always under real-time monitoring, and when the lubricating oil performance is lower than the set threshold, the controller can quickly respond to the monitoring data and start the water removal and purification device to automatically remove water from the oil in the system, so that the lubricating oil acting on the power end of the pressure plunger pump is in a high-quality state for a long time, ensuring the lubrication efficiency and lubrication effect, and solving the problem that the existing lubrication system has poor adaptability to complex working conditions and cannot ensure the long-term stable operation of the fracturing plunger pump.

[0037] In another technical solution, the novel fracturing plunger pump power end lubrication system further includes an oil filter 4, which is arranged on the second oil inlet pipe 9 and is located between the connection node of the first sampling pipe 11 and the second oil inlet pipe 9 and the oil outlet of the first oil pump 3. Among them, the oil filter 4 can be selected from conventional commercial models, and an oil filter for coarse filtration is added to the oil inlet pipeline, which can filter out large particles in the oil before the oil enters the power end of the plunger pump, which is conducive to ensuring the long-term and stable operation of the plunger pump and avoiding the frequent start-up of the water removal and purification device 6; and when the plunger pump faces harsh working environments and complex working conditions, the oil filter 4 and the water removal and purification device 6 can filter impurities in two different oil circulation loops respectively, effectively improving the oil purification efficiency and purification effect. The oil filter 4 is arranged in front of the connection node of the first sampling pipe 11 and the second oil inlet pipe 9, which can ensure that the oil entering the power end of the plunger pump and the oil entering the oil quality monitoring device 5 are of the same quality state, thereby ensuring the authenticity and effectiveness of the monitoring results.

[0038] In another technical solution, in the novel fracturing plunger pump power end lubrication system, a one-in-two-out type three-way valve is provided at the connection node between the first sampling pipe 11 and the second oil inlet pipe 9, the inlet of which is connected to the oil outlet of the first oil pump 3, and the two outlets are respectively connected to the plunger pump power end and the oil inlet of the oil product monitoring device 5; a two-in-one-out type three-way valve is provided at the connection node between the second sampling pipe 12 and the oil return pipe 10, the two inlets of which are respectively connected to the plunger pump power end and the oil outlet of the oil product monitoring device 5, and the outlet is connected to the oil return port of the lubricating oil tank 2. Specifically, the one-in-two-out type three-way valve and the two-in-one-out type three-way valve are both electric valves, which are electrically connected to the controller 7, so that the connection state of each inlet and outlet of the above two three-way valves can be adjusted by the controller 7, making the switching of the working state of the lubrication system more convenient and flexible. When the lubrication system is operating normally, the three pipe ports of the one-inlet and two-outlet three-way valve are all in an open state and can be used as a diverter valve, and the three pipe ports of the two-inlet and one-outlet three-way valve are all in an open state and can be used as a combining valve; when the plunger pump needs to be adjusted or overhauled, the valve outlet of the one-inlet and two-outlet three-way valve connected to the power end of the plunger pump and the valve outlet of the two-inlet and one-outlet three-way valve adjacent to the power end of the plunger pump can be disconnected to maintain online monitoring and / or purification of the oil in the lubricating oil tank; similarly, when the oil monitoring device needs to be overhauled but the plunger pump has no faults, the valve outlets corresponding to the oil monitoring device on the two three-way valves can be disconnected separately to maintain the normal operation of the lubrication component and avoid the impact of the maintenance work on the lubrication system.

[0039] In another technical solution, in the novel fracturing plunger pump power end lubrication system, the first oil outlet and the oil return port of the lubricating oil tank 2 are relatively arranged on both sides of the upper part of the tank body, and the second oil outlet and the oil inlet are relatively arranged on both sides of the lower part of the tank body, the first oil outlet and the oil inlet are located on the same side of the tank body, and the second oil outlet and the oil return port are located on the same side of the tank body. Figure 1The pipeline connections on the components shown only indicate the difference in pipelines, and do not represent the distribution positions of the inlets and outlets (pipe ports) on the components. During use, impurity particles (water, iron filings and other impurities) in the oil tend to sink in the oil tank. The second oil outlet and the oil inlet are relatively arranged at the lower part of the box body, which can more quickly and effectively send the oil mixed with impurities to the water removal purification device 6 for purification, which is beneficial to improve the purification efficiency and purification effect; at the same time, the first oil outlet and the oil return port are relatively arranged at the upper part of the box body, which maximizes the quality of the oil sent to the power end of the plunger pump for lubrication, which is beneficial to ensure the long-term, stable and reliable operation of the plunger pump. In addition, the first oil outlet and the oil inlet are arranged on the same side of the casing, and the second oil outlet and the oil return port are arranged on the same side of the casing, so that the purified oil can enter the lubricating oil tank 2 from the oil inlet and cover the area near the first oil outlet as soon as possible, and cause the remaining unpurified oil to move to the other side (the direction of the second oil outlet) for subsequent purification. Thus, the oil output through the first oil outlet (i.e., the oil that has just entered the power end of the plunger pump) is in a high-quality, low-pollution state as much as possible, avoiding the wear particles, moisture, etc. in the oil impurities that have a negative impact on the working stability and reliability of the power end of the plunger pump.

[0040] In another technical solution, the new fracturing plunger pump power end lubrication system, the oil monitoring device 5 includes a monitoring pipeline 51, the two ends of which are respectively connected to the first sampling tube 11 and the second sampling tube 12; an oil detection sensor 52 and a particle detection sensor 53, which are arranged on the monitoring pipeline 51 at intervals, the oil detection sensor 52 is configured to detect the viscosity, density, water activity, water content, dielectric constant and temperature of the oil, and the particle detection sensor 53 is configured to detect the content of wear particles in the oil and the oil contamination. Among them, the oil detection sensor can use a commercially available multi-parameter oil state sensor, which can monitor the oil's viscosity, density, water activity, water content, dielectric constant and temperature and other property parameters; the particle detection sensor can use a commercially available oil metal abrasive particle sensor, which can respectively detect the content of ferromagnetic and non-ferromagnetic wear particles in the oil and obtain the oil contamination level. The controller can set a variety of control indicators according to the detection data of the above oil monitoring device, such as wear particle content, contamination, viscosity, water saturation (water content, water activity), dielectric constant, temperature, etc., and set the control threshold (warning value) of each control indicator according to the operation requirements of the plunger pump. When the real-time data of the control indicator exceeds the control threshold, the excess data is output and displayed on the control panel so that the staff can take corresponding measures according to the warning indicators and specific excess conditions. When the abnormal control indicators are wear particle content, contamination, viscosity, and water saturation, they can be controlled by starting the water removal and purification device. When the dielectric constant indicator is abnormal, there are two situations. The value of the dielectric constant can indicate the aging degree of the lubricating oil, and the rate of change of the dielectric constant can indicate the life percentage of the lubricating oil. When the above indicators alarm, it is necessary to consider replacing the lubricating oil. When the temperature indicator is abnormal, it means that the operating temperature of the lubricating oil is too high at this time, and a high temperature warning is required; in addition, a pressure detection component (such as a pressure gauge, etc.) can be integrated in the oil monitoring device and the oil pressure can be set as a control indicator. When the oil pressure indicator in the pipeline exceeds the control threshold, an alarm is issued to ensure the safety of system operation.

[0041] In this embodiment, the detection items and related parameters of the oil monitoring device 5 are shown in Table 1:

[0042] Table 1 Main technical indicators

[0043]

[0044]

[0045] Correspondingly, the control indicators and control thresholds set in the controller are as follows:

[0046] 1. Real-time monitoring of the water saturation of the oil entering the power end of the plunger pump. When the water content is greater than or equal to 500ppm and the water activity is greater than or equal to 0.9aw, an alarm will be triggered;

[0047] 2. Real-time monitoring of the aging degree of the oil entering the power end of the plunger pump, and an alarm will be triggered when the dielectric constant is greater than or equal to 2.7;

[0048] 3. Real-time monitoring of the viscosity of the oil entering the power end of the plunger pump, and an alarm will be triggered when the viscosity is less than or equal to 56cp;

[0049] 4. Real-time monitoring of the operating temperature of the oil entering the power end of the plunger pump, and an alarm will be sounded when the temperature is greater than or equal to 80 degrees Celsius;

[0050] 5. Automatically calculate the hydraulic oil life percentage through comprehensive monitoring data, and alarm when the dielectric constant change rate is greater than or equal to plus or minus 15%;

[0051] 6. Real-time monitoring of the wear particle content of the oil entering the power end of the plunger pump, and an alarm will be triggered when the number of ferromagnetic wear particles or non-ferromagnetic wear particles is greater than 100;

[0052] 7. Real-time monitoring of the oil pressure in the oil monitoring device, the minimum pressure is 0bar and the maximum pressure is 40bar.

[0053] In another technical solution, the novel fracturing plunger pump power end lubrication system, the oil monitoring device 5 further includes a pressure reducing valve 54 and a flow regulating valve 55, which are arranged at intervals on the monitoring pipeline 51 near one end of the first sampling pipe 11. That is, after the oil enters the oil monitoring device 5 (monitoring pipeline 51) from the first sampling pipe 11, it first passes through the pressure reducing valve 54 and the flow regulating valve 55 in sequence, and then flows to the oil detection sensor 52 and the particle detection sensor 53 for detection. Since the oil pressure in the main circulation pipeline (the second oil inlet pipe 9) is relatively large, the lubricating oil diverted from the second oil inlet pipe 9 into the first sampling pipe 11 also has a certain pressure. The pressure reducing valve 54 and the flow regulating valve 55 are arranged in front of the sensor assembly (the oil detection sensor 52 and the particle detection sensor 53), which can adjust the oil pressure and flow in the monitoring pipeline to a detection state suitable for the sensor assembly, improve the accuracy of the detection data, and effectively avoid the problems of damage to the sensor assembly and inaccurate detection caused by excessive hydraulic pressure and flow in the monitoring pipeline.

[0054] In another technical solution, in the power end lubrication system of the new fracturing plunger pump, the water removal and purification device 6 also includes a pressure gauge 64 and an electric transmitter 65, which are arranged at the input end of the water removal and impurity removal filter 62, and the pressure gauge 64 is configured to detect the liquid pressure of the input pipe port of the water removal and impurity removal filter 62, and the electric transmitter 65 is electrically connected to the pressure gauge 64 and the controller 7; the overflow valve 63, whose liquid inlet and liquid outlet are respectively connected to the oil outlet and oil inlet of the second oil pump 61.

[0055] In the above technical solution, the pressure gauge 64 determines the blockage degree of the filter element of the dewatering and impurity removing filter 62 by monitoring the pressure of the input pipe port, and the electric transmitter 65 can identify the pressure signal transmitted by the pressure gauge 64. When the pressure value reaches the set threshold value, the electric transmitter 65 automatically sends an alarm signal to the controller 7, and the controller 7 outputs an alarm message, indicating that the blockage degree of the filter element of the dewatering and impurity removing filter 62 has reached the set upper limit and needs to be processed or replaced. In addition, a relief valve 63 is also arranged in parallel at the second oil pump 61, which is a normally closed valve with one-way conduction. The liquid inlet of the relief valve 63 is connected to the oil outlet of the second oil pump 61 through the liquid inlet pipeline (that is, it is connected to the oil transmission pipeline between the second oil pump 61 and the dewatering and impurity removing filter 62), and the liquid outlet of the relief valve 63 is connected to the oil inlet of the second oil pump 61 through the liquid outlet pipeline (that is, it is connected to the first purification pipe 13). When the liquid pressure at the input pipe port of the water-removing and impurity-removing filter 62 is relatively small, the oil pressure at the liquid inlet of the overflow valve 63 is also relatively small, and the overflow valve 63 is in a non-conducting state; when the liquid pressure at the input pipe port of the water-removing and impurity-removing filter 62 increases to a certain extent, the oil between the second oil pump 61 and the water-removing and impurity-removing filter 62 flows back to the oil inlet of the second oil pump 61 through the overflow valve 63 under the action of pressure, and then re-enters the normal oil circulation (in the first purification pipe 13), thereby effectively balancing the oil pressure on both sides of the second oil pump 61 when the filter element is blocked, alleviating the oil pressure at the input end of the water-removing and impurity-removing filter 62, and avoiding problems such as excessive pipeline pressure at this location causing damage to components when the filter element is seriously blocked, further ensuring the stable operation of the lubrication system.

[0056] The novel fracturing plunger pump power end lubrication system of the utility model can greatly improve the reliability of related equipment, and after mature application, it can be promoted to pump lubrication systems in other fields, not limited to the technical field of fracturing plunger pumps, and has broad application prospects.

[0057] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A new type of fracturing plunger pump power end lubrication system, characterized in that: include: A lubricating oil tank, whose oil return port is connected to the oil outlet of the power end of the plunger pump through an oil return pipe; a first oil pump, whose oil inlet is connected to the first oil outlet of the lubricating oil tank through a first oil inlet pipe, and whose oil outlet is connected to the oil inlet of the power end of the plunger pump through a second oil inlet pipe; An oil quality monitoring device, whose oil inlet is connected to the second oil inlet pipe through a first sampling pipe, and whose oil outlet is connected to the oil return pipe through a second sampling pipe, and the oil quality monitoring device is configured to detect the property parameters of the oil and the parameters of the particles in the oil; A water removal and purification device, comprising a second oil pump, whose oil inlet is connected to the second oil outlet of the lubricating oil tank through a first purification pipe; a water removal and impurity removal filter, whose input end is connected to the oil outlet of the second oil pump, and whose output end is connected to the oil inlet of the lubricating oil tank through a second purification pipe; A controller is electrically connected to the oil product monitoring device and the water removal and purification device.

2. The novel fracturing plunger pump power end lubrication system according to claim 1 is characterized in that: It also includes an oil filter, which is arranged on the second oil inlet pipe and is located between the connection node between the first sampling pipe and the second oil inlet pipe and the oil outlet of the first oil pump.

3. The novel fracturing plunger pump power end lubrication system according to claim 1 is characterized in that: A one-in-two-outlet three-way valve is provided at the connection node between the first sampling pipe and the second oil inlet pipe, wherein the inlet thereof is connected to the oil outlet of the first oil pump, and the two outlets are respectively connected to the power end of the plunger pump and the oil inlet of the oil quality monitoring device; a two-in-one-outlet three-way valve is provided at the connection node between the second sampling pipe and the oil return pipe, wherein the two inlets thereof are respectively connected to the power end of the plunger pump and the oil outlet of the oil quality monitoring device, and the outlet is connected to the oil return port of the lubricating oil tank.

4. The novel fracturing plunger pump power end lubrication system according to claim 1 is characterized in that: The first oil outlet and the oil return port of the lubricating oil tank are relatively arranged on both sides of the upper part of the tank body, and the second oil outlet and the oil inlet are relatively arranged on both sides of the lower part of the tank body. The first oil outlet and the oil inlet are located on the same side of the tank body, and the second oil outlet and the oil return port are located on the same side of the tank body.

5. The novel fracturing plunger pump power end lubrication system according to claim 1 is characterized in that: The oil monitoring device includes a monitoring pipeline, whose two ends are respectively connected to the first sampling tube and the second sampling tube; an oil detection sensor and a particle detection sensor, which are arranged on the monitoring pipeline at intervals, the oil detection sensor is configured to detect the viscosity, density, water activity, water content, dielectric constant and temperature of the oil, and the particle detection sensor is configured to detect the content of wear particles in the oil and the degree of oil contamination.

6. The novel fracturing plunger pump power end lubrication system as claimed in claim 5 is characterized in that: The oil product monitoring device further comprises a pressure reducing valve and a flow regulating valve, which are arranged at intervals on the monitoring pipeline close to one end of the first sampling pipe.

7. The novel fracturing plunger pump power end lubrication system according to claim 1 is characterized in that: The dewatering and purification device further comprises a pressure gauge and an electric transmitter, which are arranged at the input end of the dewatering and impurity removing filter, the pressure gauge is arranged to detect the liquid pressure of the input pipe port of the dewatering and impurity removing filter, and the electric transmitter is electrically connected to the pressure gauge and the controller; The overflow valve has a liquid inlet and a liquid outlet connected to the oil outlet and the oil inlet of the second oil pump respectively.

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