Plunger pump lubricating system

Abstract

The plunger pump lubricating system comprises an oil tank, a plunger pump, a detection element and a data acquisition diagnostor, the oil tank is provided with an oil supply port and an oil return port which are communicated with each other, and the plunger pump is provided with a first oil inlet, a second oil inlet and an oil outlet communicated with the first oil inlet and the second oil inlet. The first oil inlet and the second oil inlet are communicated with the oil supply port through an oil collection block, the oil outlet is communicated with the oil return port, the detection element is arranged in the oil tank and / or arranged on a pipeline connecting the oil tank and the plunger pump, and the data collection diagnostor is in communication connection with the detection element and the plunger pump and used for collecting data parameters detected by the detection element. And the data acquisition module is used for acquiring the data parameters and analyzing the data parameters, so that an operator can timely know the lubricating oil state of the plunger pump lubricating system in the working process, the lubricating oil can be timely replaced when the lubricating oil is seriously polluted or oxidized and the lubricating effect is poor, and the situation that the plunger pump is abraded and breaks down is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plunger pump lubrication, in particular to a plunger pump lubrication system. BACKGROUND

[0002] The plunger pump is the main equipment for pumping fracturing medium in the fracturing process of oil and gas fields. Its role is to pump high-pressure fracturing fluid into oil or gas wells to achieve the purpose of increasing oil production. In order to ensure the normal operation of the plunger pump, the crankshaft, pull rod, plunger and other key parts of the plunger pump need to be lubricated to reduce the wear between moving parts and prolong the service life of the equipment.

[0003] However, during the operation of the plunger pump, metal debris generated between moving parts or external water vapor can contaminate the lubricating oil, and if the plunger pump operates for a long time in a high-temperature environment or other harsh environments, the lubricating oil is also prone to oxidation, which reduces the performance of the lubricating oil. If the state of the lubricating oil cannot be obtained in time to replace the lubricating oil in time, it will cause serious damage to the plunger pump. The poor lubricating oil will increase the friction between the internal parts of the plunger pump, causing the wear speed between the parts of the plunger pump to increase, reducing the service life; and will cause the performance of the plunger pump to decline, affecting the normal operation of the entire oilfield production equipment. CONTENT OF THE INVENTION

[0004] Therefore, the purpose of the present application is to provide a plunger pump lubrication system that can detect the state of the lubricating oil in real time, replace the lubricating oil in time on the basis of the maximum use of the lubricating oil, and avoid the occurrence of wear and failure of the plunger pump due to contamination or oxidation of the lubricating oil.

[0005] According to one aspect of the present application, a plunger pump lubrication system is provided, comprising:

[0006] An oil tank for storing lubricating oil, the oil tank having an oil inlet and an oil return port in communication with each other;

[0007] A plunger pump having a first oil inlet and a second oil inlet, and having an oil outlet in communication with the first oil inlet and the second oil inlet; the first oil inlet and the second oil inlet are communicated with the oil inlet through an oil collecting block; the oil outlet is communicated with the oil return port;

[0008] At least two detection elements are arranged in the oil tank and / or on the pipeline connecting the oil tank and the plunger pump;

[0009] A data acquisition diagnostic device is communicatively connected to the detection element and the plunger pump, and is configured to acquire data parameters detected by the detection element and analyze the data parameters to monitor the running state of the plunger pump in real time.

[0010] In one of the embodiments, a filter is arranged between the oil collection block and the oil supply port of the oil tank, and a filter core safety valve is arranged on the filter, and the filter core safety valve is connected to the oil return port of the oil tank; the filter is configured to filter the lubricating oil flowing out of the oil supply port, and the filter core safety valve is configured to control the lubricating oil to flow back to the oil tank when the oil pressure at the inlet end of the filter exceeds a set value.

[0011] In one of the embodiments, the at least two detection elements include an oil pressure differential sensor arranged on the filter, and the oil pressure differential sensor is configured to monitor the pressure difference between the inlet and outlet of the filter.

[0012] In one of the embodiments, a thermostat and a radiator are arranged between the oil collection block and the filter, and the thermostat and the radiator are arranged in parallel.

[0013] When the temperature of the lubricating oil is within a set value, the thermostat controls the lubricating oil to flow to the oil collection block; when the temperature of the lubricating oil exceeds a set value, the thermostat controls the lubricating oil to flow to the radiator, and the radiator is configured to cool the lubricating oil whose temperature exceeds a set value.

[0014] In one of the embodiments, a one-way valve connected to the oil collection block is arranged at the outlet end of the filter, and the one-way valve is configured to be opened when the thermostat is blocked, so that the lubricating oil can directly flow to the oil collection block.

[0015] In one of the embodiments, a hot oil device is arranged between the filter and the oil supply port of the oil tank, and the hot oil device is configured to heat the lubricating oil when the temperature of the lubricating oil is below a certain temperature.

[0016] In one of the embodiments, a plunger pump safety valve is arranged at the first oil inlet and / or the second oil inlet, the plunger pump safety valve is connected to the oil return port of the oil tank through an oil return pipe, and the plunger pump safety valve is configured to control the lubricating oil to flow back to the oil tank through the oil return pipe when the oil pressure at the first oil inlet and / or the second oil inlet exceeds a set value.

[0017] In one of the embodiments, the at least two detection elements include an oil temperature sensor arranged on the oil return pipe, and the oil temperature sensor is configured to monitor the return temperature of the lubricating oil after completing lubrication and cooling of the plunger pump.

[0018] In one of the embodiments, the at least two detecting elements include pressure sensors installed at the positions of the first oil inlet and / or the second oil inlet, which are used to monitor the lubricating oil pressure data entering the plunger pump from the first oil inlet and / or the second oil inlet.

[0019] In addition, the at least two detecting elements further include one or more of water content sensors, oil quality sensors and metal wear particle sensors, which are arranged in the oil tank.

[0020] In one of the embodiments, the plunger pump has a main oil pipe connecting the first oil inlet and the second oil inlet, and a plurality of pairs of parts capable of relative movement, and each pair of parts capable of relative movement has a lubricating point connected to the main oil pipe.

[0021] The plunger pump lubrication system has the following advantages. Firstly, the at least two detecting elements arranged in the oil tank and / or between the oil tank and the plunger pump can detect the physical properties of the lubricating oil in real time, and the data acquisition and diagnosis device can be communicatively connected to the detecting elements and the plunger pump to acquire and analyze the data parameters detected by the detecting elements in real time and monitor the operation state of the plunger pump in real time, so that the operator can know the state of the lubricating oil in the plunger pump lubrication system in real time, and the lubricating oil can be replaced in time when the lubricating oil is seriously contaminated or oxidized to cause poor lubrication effect, thereby avoiding the wear and failure of the plunger pump and prolonging the service life of the plunger pump and ensuring the normal operation of the entire oilfield exploitation equipment.

[0022] Secondly, the oil collecting block arranged between the oil supply port of the oil tank and the plunger pump can divide the lubricating oil flowing out of the oil supply port into two paths, and the lubricating oil in the two paths enters the plunger pump through the first oil inlet and the second oil inlet of the plunger pump, respectively, so that the problem of poor lubrication of the plunger pump caused by insufficient supply of lubricating oil can be avoided, and the lubricating oil can enter the plunger pump quickly, thereby ensuring the timeliness of the lubricating oil delivery and the sufficiency of the lubricating oil amount and meeting the lubrication demand of the plunger pump. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The structure diagram of the plunger pump lubrication system according to one of the embodiments of the present application is shown.

[0024] Figure 2 The oil path layout diagram of the plunger pump lubrication system according to one of the embodiments of the present application is shown.

[0025] Figure 3Internal structure of a plunger pump provided by an embodiment of the present application Figure 1 .

[0026] Figure 4 Internal structure of a plunger pump provided by an embodiment of the present application Figure 2 .

[0027] Explanation of reference numerals:

[0028] 10, lubrication system of plunger pump; 100, oil tank; 101, oil inlet; 102, oil return; 200, oil pump; 300, plunger pump; 301, first oil inlet; 302, second oil inlet; 303, oil outlet; 304, first lubrication point; 305, second lubrication point; 306, third lubrication point; 307, fourth lubrication point; 308, fifth lubrication point; 309, sixth lubrication point; 310, driving gear; 320, driven gear; 330, crankshaft; 340, connecting rod; 350, crosshead; 360, gear bearing; 370, first bearing shell; 380, second bearing shell; 400, detection element; 410, oil pressure differential sensor; 420, pressure sensor; 430, oil temperature sensor; 440, water content sensor; 450, oil quality sensor; 460, metal wear particle sensor; 500, oil collecting block; 600, oil return pipe; 700, plunger pump safety valve; 800, filter; 900, filter element safety valve; 1000, thermostat; 1100, radiator; 1200, check valve; 1300, oil heater. DETAILED DESCRIPTION

[0029] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of ways other than those described herein without departing from the spirit of the present application, and it is understood that similar modifications of the present application will occur to the skilled in the art. Therefore, the present application is not intended to be limited to the specific embodiments disclosed below.

[0030] In the description of the present application, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or piece referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In addition, the terms "first", "second", and the like, if any, are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or implicating the number of indicated technical features. Thus, a feature defined with "first" or "second" can include at least one of the features explicitly or implicitly. In the description of the present application, the term "plurality" means at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0032] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be interpreted broadly. For example, it can be fixedly connected, or detachably connected, or integrated; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication or interaction of two parts, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In the present application, unless otherwise explicitly specified and limited, if there is a description of the first feature "on" or "under" the second feature and the like, it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "on", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or only indicate that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or only indicate that the first feature is lower than the second feature in horizontal height.

[0034] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only implementation.

[0035] As described in the background, the plunger pump is the main equipment for pumping fracturing medium at high pressure in the fracturing process of oil and gas fields, which pumps the fracturing fluid at high pressure into the oil or gas well to realize the rupture of the production bottom layer, thereby achieving the purpose of increasing the production of oil fields. In order to ensure the normal operation of the plunger pump, it is necessary to use lubricating oil to lubricate the internal parts of the plunger pump to reduce the wear between moving parts, prolong the service life of the equipment, and by using lubricating oil to circulate lubrication inside the plunger pump, a layer of oil film can be formed on the metal surface of the internal parts of the plunger pump to prevent direct contact of metal and avoid corrosion and rust; Moreover, it can also reduce the impact and vibration of the moving parts of the plunger pump, thereby reducing the noise of the plunger pump.

[0036] However, during the operation of the plunger pump, especially during the initial running-in of the new pump, metal debris will be generated between the moving parts in the plunger pump during running-in, and inevitably, the metal debris will enter the lubricating oil and affect the cleanliness of the lubricating oil; Moreover, during the operation of the plunger pump, if the position of the oil seal or sealing strip fails, water from the outside will also enter the inside of the plunger pump, causing pollution to the lubricating oil and leading to abnormality such as emulsification of the lubricating oil; On the other hand, if the plunger pump operates for a long time in a high temperature environment or other harsh environments, the lubricating oil is also prone to oxidation, causing the performance of the lubricating oil to decrease. If the lubricating oil of the plunger pump is not replaced in time, it will cause serious damage to the plunger pump, and the poor lubricating oil will increase the friction between the internal parts of the plunger pump, causing the wear speed between the parts of the plunger pump to increase, thereby reducing the service life of the plunger pump; Moreover, the poor lubricating oil will cause the performance of the plunger pump to decrease and cause abnormal noise during the operation of the plunger pump, thereby affecting the normal operation of the entire oil field production equipment and the normal operation and judgment of the operating personnel.

[0037] Therefore, the present application provides a plunger pump lubrication system, which can enable the operating personnel to know the state of the lubricating oil and the working state of the plunger pump in real time, and on the basis of the maximum use of the lubricating oil, the lubricating oil can be replaced in time to avoid the plunger pump from being worn and damaged due to poor lubrication of the lubricating oil, thereby prolonging the service life of the plunger pump, reducing downtime loss, and improving the production efficiency of the plunger pump.

[0038] In the following, the structure of the plunger pump lubrication system provided by the present application will be described by taking the application of the plunger pump lubrication system to the fracturing equipment for increasing the production of oil and gas fields as an example. The present embodiment is only used as an example for illustration and will not limit the technical scope of the present application. It can be understood that in other embodiments, the plunger pump lubrication system of the present application is not limited to being applied only to the fracturing equipment for increasing the production of oil and gas fields, but can also be used in any equipment with a plunger pump, which is not limited herein.

[0039] Referring to Figure 1 and Figure 2 , Figure 1Fig. 1 shows a structural schematic diagram of a lubricating system 10 of a plunger pump in an embodiment of the present application, Figure 2 Fig. 1 shows a structural schematic diagram of a lubricating system 10 of a plunger pump in an embodiment of the present application, The plunger pump lubricating system 10 provided by the embodiment of the present application comprises an oil tank 100, an oil pump 200, a plunger pump 300, at least two detection elements 400 and a data acquisition diagnostic device (not shown in the figure), wherein the plunger pump 300 is used for high-pressure pumping of liquid (such as fracturing medium), the oil tank 100 and the plunger pump 300 are connected to each other through pipelines; the oil tank 100 stores lubricating oil, the lubricating oil can be pumped out of the oil tank 100 under the power provided by the oil pump 200, enter the plunger pump 300 through the pipelines and lubricate the plunger pump 300, so as to ensure that the plunger pump 300 can work normally; all the detection elements 400 are arranged in the oil tank 100 and / or on the pipelines connecting the oil tank 100 and the plunger pump 300, so as to detect physical properties of the lubricating oil (such as one or more properties of the lubricating oil, such as oil temperature, oil pressure, viscosity, pH value, metal content, water content, etc.); the data acquisition diagnostic device is communicatively connected to the detection elements 400 and the plunger pump 300, which is used for acquiring data parameters detected by the detection elements 400 and analyzing the data parameters to monitor the running state of the plunger pump 300 in real time, so that the operator can know the state of the lubricating oil in real time, the lubricating oil can be replaced in time when the lubricating oil is seriously contaminated or oxidized to cause poor lubrication effect, the wear and failure of the plunger pump 300 can be avoided, the service life of the plunger pump 300 can be prolonged, and the normal operation of the entire oilfield exploitation equipment can be ensured.

[0040] Specifically, as shown in Figs. 1 to 3, Figure 1 and Figure 2 Specifically, as shown in Figs. 1 to 3, The oil tank 100 has an oil inlet 101 and an oil return port 102 which are communicated with each other, the plunger pump 300 has a first oil inlet 301 and a second oil inlet 302 arranged at opposite ends thereof, and has an oil outlet 303 which is communicated with the first oil inlet 301 and the second oil inlet 302, the first oil inlet 301 and the second oil inlet 302 are communicated with the oil inlet 101 through a oil collecting block 500, and the oil outlet 303 is communicated with the oil return port 102 of the oil tank 100.

[0041] Specifically, the oil collecting block 500 is similar to a three-way valve, and can divide the lubricating oil flowing out of the oil supply port 101 into two paths, one of which enters the plunger pump 300 from the first oil inlet port 301, and the other of which enters the plunger pump 300 from the second oil inlet port 302. In this way, the problem of poor lubrication of the plunger pump 300 due to insufficient lubricating oil supply can be avoided, so that the lubricating oil can quickly enter the plunger pump 300, ensuring the timeliness of lubricating oil delivery and the sufficiency of lubricating oil amount, and meeting the lubrication demand of the plunger pump 300. Moreover, since the oil outlet port 303 is in communication with the oil return port 102 of the oil tank 100, the lubricating oil can return to the oil tank 100 from the oil return port 102 of the oil tank 100 after lubricating the plunger pump 300, thereby forming a circulating oil path, so that the lubricating oil can circulate and flow, and thus the plunger pump 300 is not only circularly lubricated, but also circularly cooled.

[0042] Preferably, the plunger pump safety valve 700 is arranged at the position of the first oil inlet port 301 and / or the second oil inlet port 302, and is in communication with the oil return port 102 of the oil tank 100 through the oil return pipe 600. The plunger pump safety valve 700 is used to control the lubricating oil to return to the oil tank 100 through the oil return pipe 600 when the oil pressure at the position of the first oil inlet port 301 and / or the second oil inlet port 302 exceeds a set value, that is, when the oil pressure is too large when the lubricating oil enters the plunger pump 300 from the first oil inlet port 301 and / or the second oil inlet port 302, the plunger pump safety valve 700 is opened, so that the lubricating oil can return to the oil tank 100 through the oil return pipe 600, thereby ensuring that the oil pressure of the lubricating oil entering the plunger pump 300 is stable within the required oil pressure range, and avoiding damage to the plunger pump lubrication system 10 caused by overpressure of the oil pressure.

[0043] Further, please continue to refer to Figure 1 and Figure 2 On the basis of the above embodiment, the filter 800 is arranged between the oil collecting block 500 and the oil supply port 101 of the oil tank 100, and is used to filter the lubricating oil flowing out of the oil supply port 101, so as to ensure that the filtering precision of the filtered lubricating oil meets the use demand of the plunger pump 300. Moreover, the filter core safety valve 900 in communication with the oil return port 102 is arranged at the position of the inlet end of the filter 800. The purpose of arranging the filter core safety valve 900 is to ensure that the oil pressure of the lubricating oil entering the filter 800 is stable within the required lubricating oil pressure, and also to avoid damage to the plunger pump lubrication system 10 caused by overpressure of the oil pressure. Similar to the action principle of the plunger pump safety valve 700, when the oil pressure at the inlet end position of the filter 800 exceeds a set value, the filter core safety valve 900 is opened, and the lubricating oil returns to the oil tank 100, thereby achieving the purpose of stabilizing the oil pressure.

[0044] Further, the oil collecting block 500 and the filter 800 are further provided with a thermostat 1000 and a radiator 1100, the thermostat 1000 and the radiator 1100 are connected in parallel, the thermostat 1000 controls the flow path of the lubricating oil according to the oil temperature of the lubricating oil, so that the oil temperature of the lubricating oil can be controlled within the required range, when the oil temperature entering the thermostat 1000 is within the set value, the thermostat 1000 controls the lubricating oil to flow directly to the oil collecting block 500, when the oil temperature entering the thermostat 1000 exceeds the set value, the thermostat 1000 controls the lubricating oil to flow to the radiator 1100, and then the lubricating oil after heat dissipation flows into the oil collecting block 500, and then the lubricating oil with suitable temperature flows from the oil collecting block 500 to the plunger pump 300.

[0045] It is worth noting that in some extreme cases, the thermostat 1000 may be blocked, at this time, in order to make the lubricating oil still flow normally to the oil collecting block 500, avoid the oil pressure rising in the system due to the oil passage being blocked, the outlet end of the filter 800 is further provided with a one-way valve 1200 connected to the oil collecting block 500, the one-way valve 1200 opens when the thermostat 1000 is blocked, so that the lubricating oil can flow directly to the one-way valve 1200, avoiding the oil pressure rising in the system due to the oil passage being blocked, thereby avoiding damage to the plunger pump lubrication system 10.

[0046] In this way, the flow of lubricating oil in the entire plunger pump lubrication system 10 is as follows: the oil pump 200 pumps lubricating oil from the oil supply port 101 of the oil tank 100, the lubricating oil flows through the filter 800, the thermostat 1000 and the oil collecting block 500 in turn, and then flows into the plunger pump 300 from the first oil inlet port 301 and the second oil inlet port 302 to lubricate the plunger pump 300, and then flows back to the oil return port 102 of the oil tank 100 through the oil return pipe 600 after lubrication, thereby realizing the circulation of the oil. In this process, if the oil pressure of the lubricating oil is too high at the inlet of the filter 800, the lubricating oil can flow back to the oil tank 100 under the control of the safety valve of the filter 800; if the oil temperature of the lubricating oil is too high when flowing to the thermostat 1000, the lubricating oil will flow to the radiator 1100 under the control of the thermostat 1000, and then flow to the oil collecting block 500 after being cooled by the radiator 1100, and when the lubricating oil reaches the position of the first oil inlet port 301 and / or the second oil inlet port 302, if the oil pressure is too high, the lubricating oil can also flow back to the oil tank 100 under the control of the plunger pump safety valve 700, thereby ensuring the safe operation of the plunger pump lubrication system 10, and making the lubricating oil circulate within the appropriate pressure and temperature range.

[0047] In addition, the plunger pump 300 may be operated in a cold environment, and the lubricating oil may not flow due to the low ambient temperature. In order to solve this problem, in a more preferred embodiment, a heater 1300 is arranged between the filter 800 and the oil supply port 101 of the oil tank 100. The heater 1300 can be used to heat the lubricating oil when the temperature of the lubricating oil flowing out of the oil tank 100 is below a certain temperature, so as to improve the flowability of the lubricating oil, and ensure that the plunger pump 300 or other parts in the lubricating system are not damaged due to the excessive viscosity and insufficient flowability of the lubricating oil.

[0048] For the specific types of the detection element 400 mentioned above, please refer to the following Figure 2 In the embodiment shown in the figure, the detection element 400 includes an oil pressure differential sensor 410, a pressure sensor 420, an oil temperature sensor 430, a water content sensor 440, an oil quality sensor 450, and a metal wear particle sensor 460, etc. The oil pressure differential sensor 410 is installed on the filter 800, which is used to monitor the pressure difference at the inlet and outlet positions of the filter 800. By monitoring the pressure difference at the inlet and outlet positions of the filter 800, the state of the filter element in the filter 800 or the oil quality of the lubricating oil can be determined. If the pressure difference at the inlet and outlet positions of the filter 800 exceeds a certain value, the data acquisition diagnostic device will prompt the filter element alarm, and the instruction manual indicates that the lubricating oil pressure drop through the filter 800 is relatively large, so it can be determined that a large amount of impurities has accumulated in the filter element of the filter 800, and the filter element needs to be replaced in time. If the filter element alarm occurs frequently in a short period of time during the operation of the plunger pump 300, it can be determined that the oil quality of the lubricating oil is poor (i.e. the content of metal impurities in the lubricating oil is relatively high, and the lubricating oil needs to be replaced in time).

[0049] The pressure sensor 420 is installed at the position of the first oil inlet 301 and / or the second oil inlet 302, which is used to monitor the lubricating oil pressure data entering the plunger pump 300 from the first oil inlet 301 and / or the second oil inlet 302. The oil pressure of the lubricating oil is a key parameter monitored in the plunger pump lubricating system 10. By monitoring the change of the oil pressure of the lubricating oil, the problems inside the plunger pump 300 can be found in time, such as the blockage of the lubricating system, the wear of the bearing or the bearing bush, etc. Optionally, the pressure sensor 420 can be an inductance pressure gauge, or a direct inductance pressure gauge. The direct inductance pressure gauge can directly measure the oil pressure value of the lubricating oil, and the inductance pressure gauge indirectly measures the pressure by the change of the inductance of the inductance coil. Therefore, the direct inductance pressure gauge is suitable for general working environments, while the inductance pressure gauge is more suitable for environments with strong electromagnetic interference or environments requiring remote signal transmission. The direct inductance pressure gauge and the inductance pressure gauge can also be installed at the same time, and they can be used together to verify each other, so as to improve the accuracy and reliability of the measurement, and thus to adapt to the needs of more working environments.

[0050] The oil temperature sensor 430 is installed on the return oil pipe 600, which is used to monitor the return oil temperature of the lubricating oil after completing the lubrication and cooling of the plunger pump 300. The oil temperature of the lubricating oil is also a key parameter in the plunger pump lubrication system 10. An excessively high oil temperature value detected by the oil temperature sensor 430 can also indicate that the plunger pump 300 may have abnormal problems such as bush burning, wear, or poor lubrication.

[0051] The water content sensor 440, the oil quality sensor 450, and the metal wear particle sensor 460 are all installed in the oil tank 100. Specifically, the water content in the oil is a key parameter monitored in the plunger pump lubrication system 10. If the water content in the lubricating oil increases, it will cause abnormal emulsification of the lubricating oil of the plunger pump 300, and the performance of the lubricating oil will be severely degraded, which will have a serious impact on the plunger pump 300. The water content sensor 440 is sensitive to changes in the water content in the lubricating oil and can accurately monitor the free water and emulsified water in the lubricating oil in real time and continuously, providing comprehensive real-time online water monitoring for the lubricating oil. By monitoring the water content in the oil using the water content sensor 440, it can be diagnosed that the plunger pump 300 has a problem of poor sealing at the sealing position, so the relevant sealing parts can be replaced in time.

[0052] Similarly, the oil quality is a comprehensive parameter of the deterioration of the oil product, which can represent the state of the oil product, such as acidity, viscosity, wear particles, mechanical impurities, water content, and additive cracking. If the lubricating oil deteriorates, the lubricating effect of the lubricating oil will decrease, and the lubrication and cooling requirements of the moving parts of the plunger pump 300 cannot be met, which will seriously affect the service life of the plunger pump 300. The oil quality sensor 450 is extremely sensitive to changes in the quality of the lubricating oil, and monitoring the oil quality using the oil quality sensor 450 can continuously reflect the changes in the state of the lubricating oil of the plunger pump 300 in real time.

[0053] For the metal wear particle sensor 460, the metal wear particle sensor 460 can monitor the number and size distribution of ferromagnetic particles and non-ferromagnetic particles in the lubricating oil at the same time, which is crucial for monitoring the wear state of the plunger pump 300. This is because the internal moving parts of the plunger pump 300 will produce wear during operation, resulting in metal debris such as copper debris. These metal debris are ferromagnetic particles or non-ferromagnetic particles. If the number of ferromagnetic particles monitored increases, it can be determined that the plunger pump 300 has abnormal metal wear. If the non-ferromagnetic particles monitored show an abnormal upward trend, it indicates that the wear of the moving parts inside the plunger pump 300 is abnormal. At this time, the operator can stop the machine in time for processing, so as to avoid serious damage to the plunger pump 300.

[0054] Of course, the type of detection element 400 is not limited to the above-mentioned series of sensors, and can also be other types of sensors, such as sensors for monitoring the viscosity and pH of lubricating oil, etc., and is not particularly limited herein.

[0055] It should be noted that the plunger pump lubrication system 10 described above can be increased or decreased in the number of filters 800, thermostats 1000, radiators 1100, oil collecting blocks 500, and detection elements 400 according to actual needs to meet the actual use requirements of the field.

[0056] In addition, the plunger pump 300 has a main oil pipe (not shown in the figure) communicating the first oil inlet 301 and the second oil inlet 302, and a plurality of pairs of parts capable of relative movement, and each pair of parts capable of relative movement has a lubrication point communicating with the main oil pipe. These lubrication points are positions where the parts inside the plunger pump 300 are prone to wear due to relative movement during operation. By connecting the lubrication points to the main oil pipe, the lubricating oil can flow from the main oil pipe to each lubrication point, thereby lubricating and cooling each lubrication point to ensure the normal operation of the plunger pump 300.

[0057] For example Figure 3 and Figure 4 The internal structure of the plunger pump 300 of an embodiment is shown, which includes a driving gear 310, a driven gear 320, a crankshaft 330, a connecting rod 340, a crosshead 350, and a sliding sleeve (not shown in the figure). The driving gear 310 is connected to the motor, the driven gear 320 is engaged with the driving gear 310, the crankshaft 330 is connected to the driven gear 320, the connecting rod 340 has a large end and a small end, the large end is eccentrically rotatable to the crankshaft 330, and the small end is rotatably connected to the crosshead 350. The sliding sleeve is interference-fitted in the power end housing of the plunger pump 300, and the sliding sleeve is sleeved on the crosshead 350. Under the drive of the motor, the driving gear 310 rotates, causing the driven gear 320 to also rotate and drive the connecting rod 340 to move, thereby driving the crosshead 350 to perform reciprocating linear motion, and thereby realizing high-pressure pumping of fracturing medium.

[0058] In order to reduce friction and make rotation more smooth when the moving parts rotate relatively, the gear shaft sleeve of the driving gear is provided with a gear bearing 360, the end of the crankshaft 330 is also sleeved with a crankshaft bearing (not shown in the figure), the large end of the connecting rod 340 is sleeved with a first bearing bush 370, and the small end is sleeved with a second bearing bush 380. Therefore, for the above structure, the meshing part of the driving gear 310 and the driven gear 320, the contact part of the driving gear 310 and the gear bearing 360, the contact part of the crankshaft 330 and the crankshaft bearing, the contact part of the large end of the connecting rod 340 and the first bearing bush 370, the contact part of the small end of the connecting rod 340 and the second bearing bush 380, and the contact part of the cross head 350 and the sliding sleeve are all positions that will produce relative wear during the operation of the plunger pump 300, so the above positions can be lubricated by lubricating oil, so that Figure 3 and Figure 4 As shown in the first lubricating point 304 formed at the meshing part of the driving gear 310 and the driven gear 320, the second lubricating point 305 formed at the contact part of the driving gear 310 and the gear bearing 360, the third lubricating point 306 formed at the contact part of the crankshaft 330 and the crankshaft bearing, the fourth lubricating point 307 formed at the contact part of the large end of the connecting rod 340 and the first bearing bush 370, the fifth lubricating point 308 formed at the contact part of the small end of the connecting rod 340 and the second bearing bush 380, and the sixth lubricating point 309 formed at the contact part of the cross head 350 and the sliding sleeve, the lubrication of the above lubricating points by using lubricating oil can ensure the normal operation of the plunger pump 300.

[0059] In summary, the plunger pump lubrication system provided by the application can monitor the key data of lubricating oil temperature, oil pressure, viscosity, pH value, metal content, water content, filter pressure difference, etc. in real time, and then transmit the monitoring data to the data acquisition and diagnosis system in real time, and realize the monitoring and fault diagnosis of the plunger pump operation state through big data and cloud computing.

[0060] Thus, on one hand, scientific data support is provided for the oil change period of the plunger pump, the timeliness of the lubricating oil change of the plunger pump and the use economy of the lubricating oil are met, the lubricating oil can be changed in time on the basis of being used to the maximum extent, wear and failure of the plunger pump caused by poor lubrication are avoided, the service life of the plunger pump is prolonged, downtime loss is reduced, and the productivity of the plunger pump is improved; on the other hand, the failure of the plunger pump device can be predicted through abnormal data fluctuation, downtime loss is reduced, productivity is improved, and the wear state of the device can be reflected, potential failure signals can be found in time, timely maintenance can be arranged, and serious wear and failure of the plunger pump can be avoided; on the other hand, remote monitoring, data analysis and failure diagnosis of the plunger pump device are realized, abnormal conditions can be found in time and corresponding measures can be taken, production safety is ensured, and the production efficiency of oilfield site operation and the management level of the device are improved.

[0061] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but it should be considered that any combination of the technical features is within the scope of the present disclosure, as long as the combination does not result in contradictions.

[0062] The above-described embodiments only express several implementation manners of the present application, and the description is specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these are within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A lubrication system for a plunger pump, characterized by The application relates to a lubricating oil system, comprising: an oil tank for storing lubricating oil, the oil tank having an oil inlet and an oil return; a plunger pump having a first oil inlet and a second oil inlet, and having an oil outlet communicating with the first oil inlet and the second oil inlet; the first oil inlet and the second oil inlet communicating with the oil inlet through a collecting block; the oil outlet communicating with the oil return; at least two detecting elements arranged in the oil tank and / or arranged on a pipeline connecting the oil tank and the plunger pump; a data acquisition diagnostic device in communication with the detecting elements and the plunger pump, the data acquisition diagnostic device being used for acquiring data parameters detected by the detecting elements and being used for analyzing the data parameters to monitor the running state of the plunger pump in real time.

2. The lubrication system for a plunger pump according to claim 1, characterized in that A filter is arranged between the collecting block and the oil inlet of the oil tank, a filter core safety valve is arranged on the filter, the filter core safety valve communicates with the oil return of the oil tank; the filter is used for filtering the lubricating oil flowing out of the oil inlet, and the filter core safety valve is used for controlling the lubricating oil to flow back into the oil tank when the oil pressure at the inlet position of the filter exceeds a set value.

3. The lubrication system for a plunger pump of claim 2, wherein, The at least two detecting elements comprise an oil pressure differential sensor arranged on the filter, and the oil pressure differential sensor is used for monitoring the pressure differential value at the inlet and outlet positions of the filter.

4. The lubrication system for a plunger pump of claim 2, wherein, A thermostat and a radiator are arranged between the collecting block and the filter, and the thermostat and the radiator are arranged in parallel; When the temperature of the lubricating oil is within a set value, the thermostat controls the lubricating oil to flow to the collecting block; When the lubricating oil exceeds a set value, the thermostat controls the lubricating oil to flow to the radiator, and the radiator is used for cooling the lubricating oil whose temperature exceeds a set value.

5. The lubrication system for a plunger pump of claim 4, wherein, A one-way valve communicating with the collecting block is arranged at the outlet end of the filter, and the one-way valve is used for being opened when the thermostat is blocked to enable the lubricating oil to directly flow to the collecting block.

6. The lubrication system for a plunger pump of claim 2, wherein, A hot oil device is arranged between the filter and the oil inlet of the oil tank, and the hot oil device is used for heating the lubricating oil when the lubricating oil is below a certain temperature.

7. The lubrication system for a plunger pump of claim 1, wherein, The first oil inlet and / or the second oil inlet are provided with a plunger pump safety valve, the plunger pump safety valve communicates with the oil return of the oil tank through a return pipe, and the plunger pump safety valve is used for controlling the lubricating oil to flow back into the oil tank through the return pipe when the oil pressure at the first oil inlet and / or the second oil inlet exceeds a set value.

8. The lubrication system for a plunger pump of claim 7, wherein, The at least two detecting elements comprise an oil temperature sensor arranged on the return pipe, and the oil temperature sensor is used for monitoring the return temperature of the lubricating oil after completing lubrication and cooling of the plunger pump.

9. The lubrication system for a plunger pump of claim 1, wherein, The at least two detecting elements comprise a pressure sensor arranged at the first oil inlet and / or the second oil inlet, and the pressure sensor is used for monitoring the lubricating oil pressure data entering the plunger pump from the first oil inlet and / or the second oil inlet. And / or, the at least two detection elements further comprise one or more of a water content sensor, an oil quality sensor, and a metal wear particle sensor, which are disposed in the oil tank.

10. The lubrication system for a plunger pump of claim 1, wherein, The plunger pump has a main oil pipe communicating the first oil inlet and the second oil inlet, and a plurality of pairs of parts capable of relative motion, and each pair of parts capable of relative motion has a lubrication point communicating the main oil pipe.

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