Fracturing pump lubricating system and method

Abstract

The invention discloses a fracturing pump lubricating system and method.The system comprises an oil tank, a conveying drive and a fracturing pump which are sequentially and circularly communicated, a heater is arranged in the oil tank, the conveying drive is used for controlling the flow of lubricating oil, and a sensor assembly and a temperature adjusting assembly are arranged between the conveying drive and the fracturing pump; the temperature adjusting assembly comprises a first branch pipe, a second branch pipe, a cooler and a flow mixing valve, the first branch pipe and the second branch pipe are connected in parallel, the cooler is arranged on the first branch pipe, the output end of the first branch pipe and the output end of the second branch pipe are connected with the input end of the flow mixing valve, and the flow mixing valve is arranged on the cooler. The mixed flow valve is used for automatically adjusting the communicating proportion of the first branch pipe and the second branch pipe to the mixed flow valve according to the temperature of the lubricating oil; the method comprises the step of ensuring the stability of the temperature, the pressure and the flow of the lubricating oil flowing into the fracturing pump, so that the normal operation of the fracturing pump is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of fracturing pump lubrication, and in particular to a fracturing pump lubrication system and method. Background Art

[0002] Fracturing trucks are widely used in oil and gas fracturing sites. The stability and automatic control of the lubrication system during the use of the fracturing pump as its core equipment are the decisive factors to ensure the normal use of the pump. The stability of the lubrication system is achieved by matching the flow, temperature and pressure of the lubricating oil within a certain parameter range.

[0003] Regarding the stability control of the lubrication system in the prior art, see the patent number CN215174027U, a fracturing truck lubrication system and a fracturing truck, which separately provides hydraulic oil to the lubrication motor through the engine of the fracturing truck in combination with the power gear pump to ensure that the lubrication motor has a sufficient speed, so that the lubrication pump driven by the lubrication motor can output a sufficient flow of lubrication oil, thereby improving the lubrication effect on the power device. This prior art only considers the impact of the flow of lubrication oil on the lubrication pump, and the factors considered are single. Only controlling the flow of lubrication oil is not enough to ensure the stability of the operation of the lubrication system. Therefore, the prior art does not fully solve the stability problem of the lubrication system. Summary of the invention

[0004] The purpose of the invention is to provide a fracturing pump lubrication system and method, which solves the problem of how to control the stability of the lubricating oil entering the fracturing pump.

[0005] The present invention is implemented as follows: a fracturing pump lubrication system includes a control system and an oil tank, a delivery drive and a fracturing pump that are cyclically connected in sequence, a heater is provided in the oil tank, the delivery drive is used to control the flow of lubricating oil, a temperature control component and a sensor component are provided in sequence between the delivery drive and the fracturing pump, the temperature control component includes a first branch pipe, a second branch pipe, a cooler and a mixing valve, the first branch pipe is connected in parallel with the second branch pipe, the cooler is placed on the first branch pipe, the output ends of the first branch pipe and the second branch pipe are respectively connected to the input end of the mixing valve, and the mixing valve is used to automatically adjust the ratio of the first branch pipe and the second branch pipe to the mixing valve according to the temperature of the lubricating oil; the control system is electrically connected to the delivery drive, fracturing pump, heater, sensor assembly and temperature control assembly.

[0006] The lubricating oil in the oil tank is driven into the fracturing pump through the conveying drive, and then returns to the oil tank from the fracturing pump to complete the circulation of the lubricating oil. During this circulation process, the lubricating oil lubricates the lubrication end in the fracturing pump to ensure the normal operation of the fracturing pump. The stability of the lubrication system during the use of the fracturing pump plays a decisive role in the normal use of the fracturing pump. The present application aims at coordinating the temperature, pressure and flow rate of the lubricating oil entering the fracturing pump within a certain parameter range. Specifically, the heater performs the operation of opening and closing or adjusting the temperature according to the lubricating oil temperature; when the lubricating oil temperature is lower than the lower limit of the set range, the heater is turned on, the cooler on the first branch pipe is turned off, and the lubricating oil temperature in the first branch pipe and the second branch pipe rises synchronously; when the lubricating oil temperature reaches the set range, the cooler on the first branch pipe is opened, and at the same time, the degree of connectivity between the mixing valve and the first branch pipe and the second branch pipe is controllable, so that the hot oil in the second branch pipe and the first branch pipe can be connected to the mixing valve. The amount of cold oil coming out of the branch pipe mixed in the mixing valve is controllable, ensuring that the temperature of the mixed lubricating oil entering the fracturing pump is controllable; when the temperature of the lubricating oil is higher than the upper limit of the set range, the second branch pipe is not connected to the input end of the mixing valve, and all the lubricating oil enters the fracturing pump after being cooled by the cooler from the first branch pipe, thereby accurately and effectively regulating the temperature entering the fracturing pump; generally speaking, the higher the temperature, the lower the pressure of the lubricating oil, and the greater the flow rate. The pressure and flow rate of the lubricating oil are further adjusted by the conveying drive to ensure the stability of the temperature, pressure and flow rate of the lubricating oil flowing into the fracturing pump, thereby ensuring the normal operation of the fracturing pump; and the sensor assembly of the present invention detects the lubricating oil mixed in the mixing valve, rather than detecting before the mixing valve in the prior art, and then adjusting the opening of the mixing valve according to the detection result. Compared with the prior art, the present invention is more accurate in controlling the relevant parameters of the lubricating oil entering the fracturing pump.

[0007] A further technical solution of the present invention is: the mixing valve includes a valve block, the valve block is provided with a valve core installation channel and a channel group that can be connected to the valve core installation channel, a valve core is provided in the valve core installation channel, and the valve core movement is used to adjust the connection ratio between the channel groups; the valve core installation channel is provided with a temperature sensing component that can expand or contract according to temperature, and the temperature sensing component is used to drive the valve core to move axially along the valve core installation channel.

[0008] The valve core is movable, and the degree of channel connectivity with the channel groups can be adjusted during the movement, thereby adjusting the mixed flow ratio and ensuring that the temperature range of the liquid flowing out of the mixing valve is accurate. The movement of the valve core of the present invention is achieved based on the reaction of the temperature sensing component to the temperature of the liquid flowing through the valve core. Specifically, when the temperature of the liquid flowing into the valve core gradually increases, the temperature sensing component also gradually expands. During the gradual expansion of the temperature sensing component, the valve core is pushed to move, thereby adjusting the degree of connectivity between the pipeline groups. Conversely, the temperature sensing component contracts and drives the valve core to move in the opposite direction. Therefore, the present invention realizes pure mechanical adjustment of the mixed flow ratio of the mixing valve, has a wide range of applications, is not easy to be damaged, and has a long service life.

[0009] A further technical solution of the present invention is that the sensor assembly includes a second temperature sensor and / or a pressure sensor and / or a flow sensor disposed at the output end of the mixing valve. The sensor assembly of the present invention detects the lubricating oil after mixing in the mixing valve, rather than detecting before the mixing valve in the prior art, and then adjusting the opening of the mixing valve according to the detection result. Compared with the prior art, the present invention is more accurate in controlling the pressure and / or temperature and / or flow of the lubricating oil entering the fracturing pump.

[0010] A further technical solution of the present invention is: the control system is used to control the delivery drive to adjust the flow rate and / or pressure of the fluid at the output end of the mixing valve according to the data transmitted by the sensor component, and the control system controls the heater and / or temperature control component to adjust the temperature of the fluid.

[0011] The input end of the mixing valve in the present invention is used to connect cold and hot fluids respectively, and the output end is provided with a sensor assembly, which transmits the sensed temperature and / or pressure and / or flow to the control system. At this time, the relevant parameters sensed by the sensor assembly are the parameters of the lubricating oil after adjustment. Compared with the prior art, the present invention is more accurate in detecting the relevant parameters of the lubricating oil entering the fracturing pump. The control system adjusts the flow and / or pressure of the fluid at the output end of the mixing valve according to the detection data of the sensor assembly, and controls the opening of the heater and / or cooler to adjust the temperature. This not only ensures the stability of the control system for the temperature, pressure and flow of the lubricating oil flowing into the fracturing pump, but also ensures the accuracy.

[0012] A further technical solution of the present invention is: a liquid level sensor and / or a first temperature sensor is provided on the oil tank.

[0013] The liquid level sensor ensures that the oil level in the oil tank is within the required range. The first temperature sensor is used to sense the temperature in the oil tank and connect to the display to display the temperature.

[0014] A further technical solution of the present invention is that the lubrication system comprises at least two sets, which are respectively used to connect to the high-pressure lubrication end and the low-pressure lubrication end of the fracturing pump.

[0015] A further technical solution of the present invention is that the conveying drive includes a gear pump and a motor connected to the gear pump.

[0016] The control system can control the pumping amount of the lubricating oil by the gear pump by controlling the speed of the motor, thereby controlling the flow rate and pressure of the lubricating oil passing through the output end of the delivery drive.

[0017] A further technical solution of the present invention is: the lubrication system also includes a base, the fracturing pump is placed at one end of the base, the oil tank is placed at one side of the base, the conveying drive is placed at the other side of the base, the cooler is placed above the base, the temperature adjustment component and the sensor component are placed on the base and below the cooler, and the oil tank, conveying drive, temperature adjustment component, sensor component and fracturing pump are all connected through pipelines. The position design of each component is reasonable, the space is fully utilized, and the oil tank and conveying drive are on both sides of the base to facilitate later maintenance and subsequent work.

[0018] A further technical solution of the present invention is: a mixed flow area is provided in the valve core, and at least two openings are provided on the valve core for connecting the channel group and the mixed flow area. One end of the temperature sensing element is placed in the mixed flow area and connected to the valve core, and the other end of the temperature sensing element is fixedly arranged.

[0019] One end of the temperature sensing element is placed in the mixed flow area. The temperature sensing element adjusts the distance that the valve core moves according to the temperature of the liquid in the mixed flow area, so that the connection ratio between the mixed flow area and the channel group is adjusted. At the same time, the temperature sensing element is placed in the mixed flow area, which can effectively reduce the space occupation. The existing method of connecting the valve core and the motor not only occupies a large space, but also the motor is exposed and prone to failure. The present invention solves this problem well.

[0020] A further technical solution of the present invention is that a spring is provided between the valve core and the valve core installation passage.

[0021] The spring can effectively ensure the valve core is reset and the accuracy of the mixing valve is guaranteed.

[0022] A further technical solution of the present invention is: the channel group includes a first input channel, a second input channel and an output channel, the mixed flow area is connected to the output channel, and the valve core moves to adjust the connection ratio between the mixed flow area and the first input channel and the second input channel.

[0023] The cold oil of the first branch pipe and the hot oil of the second branch pipe are mixed in the mixed flow area of ​​the valve core through the first input channel and the second input channel, and then flow into the fracturing pump from the output channel. During the movement of the valve core, the mixed flow area moves accordingly, so that the ratio of the lubricating oil in the first input channel and the second input channel entering the mixed flow area increases and decreases, thereby achieving accurate adjustment of the temperature of the lubricating oil in the mixed flow area and ensuring the stability of the temperature of the lubricating oil flowing out of the mixing flow valve to the fracturing pump.

[0024] A further technical solution of the present invention is: a pressure measuring joint is provided on the mixing valve, and the pressure measuring joint is connected to the mixing area for testing the pressure of the lubricating oil in the mixing area. The structural design is reasonable, and the pressure of the lubricating oil entering the fracturing pump is effectively and accurately monitored; the pressure measuring joint is integrated on the valve block, which can timely detect the pressure of the liquid and make full use of the space of the valve block.

[0025] A further technical solution of the present invention is: one end of the valve core installation channel is open, and the open end is provided with a stopper connected to the temperature sensing element. One end of the valve core installation channel is open, which is convenient for installing and replacing the valve core, and the stopper is installed at the open end, which can effectively seal the valve core installation channel.

[0026] A further technical solution of the present invention is: the valve block is a cubic structure, the channel group includes a first input channel, a second input channel and an output channel, the first input channel, the second input channel and the output channel are all connected to the valve core installation channel and are respectively placed on different end faces of the valve block.

[0027] The first input channel, the second input channel and the third input channel are located on different end surfaces of the valve block, which effectively reduces the volume requirement of the valve block.

[0028] A further technical solution of the present invention is that the first input channel and the output channel are placed on opposite sides of the valve block, and the second input channel is placed on a surface perpendicular to the valve core installation channel. This arrangement makes the channel group easier to process and the channels are shorter, requiring a smaller volume for the valve block.

[0029] A further technical solution of the present invention is: the output channel is connected to the fracturing pump through a pipe fitting, and the sensor assembly is placed on the pipe fitting.

[0030] The working principle of the mixing valve is that when the oil temperature is lower than the set opening temperature, the temperature sensing component has not reached the expansion point, the valve core is in a fully open state and does not move, and the cold oil goes directly from the oil tank to each lubrication point; when the temperature is higher than the set opening temperature, the temperature sensing component begins to expand, the valve core enters the working stroke and closes, and the hot oil from the oil tank and the cold oil cooled from the cooler are mixed to each lubrication point; when the set maximum opening temperature is reached, the temperature sensing component expands completely, the valve core is in a fully closed state, and the hot oil passes through the cooler before reaching each lubrication point; the start and stop of the cooler is controlled by the temperature of the mixed oil measured by the temperature sensor to ensure that the oil temperature entering each lubrication point is within the required range.

[0031] The present invention also provides a fracturing pump lubrication method, based on the lubrication system, comprising the following steps:

[0032] S1, the lubricating oil enters the fracturing pump from the oil tank through the conveying drive, the temperature regulating component, and the sensor component in sequence;

[0033] S2 When the sensor assembly detects that the parameters of the lubricating oil are not within the set range, the heating temperature of the heater in the oil tank, the delivery amount of the delivery drive, the start and stop of the cooler, and the ratio of the lubricating oil entering the mixing valve from the second branch pipe and the first branch pipe are adjusted, so that the lubricating oil temperature, pressure and flow sensed by the sensor assembly are within the set range;

[0034] S3. The lubricating oil flows through the fracturing pump and returns to the oil tank, thus completing the cycle.

[0035] A further technical solution of the present invention is: in the step S2, the heater is turned on and off or the temperature is adjusted according to the lubricating oil temperature, specifically including:

[0036] S21, when the sensor assembly detects that the lubricating oil temperature is lower than the lower limit of the set range, the heater is turned on, the cooler on the first branch pipe is turned off, and the lubricating oil temperatures in the first branch pipe and the second branch pipe rise synchronously;

[0037] S22, when the sensor assembly detects that the parameters of the lubricating oil have reached the set range, the cooler on the first branch pipe is turned on, and the mixing valve automatically adjusts the ratio of the first branch pipe and the second branch pipe connected to the mixing valve according to the temperature of the lubricating oil;

[0038] S23. When the sensor assembly detects that the lubricating oil temperature is higher than the maximum upper limit value of the set range, the second branch pipe and the input end of the mixing valve are closed, and the lubricating oil enters the fracturing pump after being cooled through the cooler from the first branch pipe.

[0039] Beneficial effects of the present invention: The present invention coordinates the temperature, pressure and flow rate of the lubricating oil entering the fracturing pump within a certain parameter range. Specifically, the heater is turned on and off or adjusts the temperature according to the lubricating oil temperature; when the lubricating oil temperature is lower than the lower limit of the set range, the heater is turned on, the cooler on the first branch is turned off, and the lubricating oil temperatures in the first branch and the second branch rise synchronously; when the lubricating oil temperature reaches the set range, the cooler on the first branch is turned on, and at the same time, the degree of connectivity between the mixing valve and the first branch and the second branch is controllable, so that the amount of hot oil in the second branch and the cold oil coming out of the first branch mixed in the mixing valve is controllable, ensuring that the temperature of the mixed lubricating oil entering the fracturing pump is controllable; when the lubricating oil temperature is higher than the upper limit of the set range When the limit value is reached, the second branch pipe is not connected to the input end of the mixing valve, and all the lubricating oil enters the fracturing pump after being cooled by the cooler from the first branch pipe, so as to accurately and effectively regulate the temperature entering the fracturing pump; generally speaking, the higher the temperature, the smaller the pressure of the lubricating oil, and the larger the flow rate. The pressure and flow rate of the lubricating oil are further adjusted by the conveying drive to ensure the stability of the temperature, pressure and flow rate of the lubricating oil flowing into the fracturing pump, thereby ensuring the normal operation of the fracturing pump; and the sensor assembly of the present invention detects the lubricating oil mixed by the mixing valve, instead of detecting before the mixing valve in the prior art, and then adjusting the opening of the mixing valve according to the detection result. Compared with the prior art, the present invention has more precise control over the relevant parameters of the lubricating oil entering the fracturing pump.

[0040] The valve core of the present invention is movable, and the degree of channel connectivity with the channel groups can be adjusted during the movement, thereby adjusting the mixed flow ratio and ensuring that the temperature range of the liquid flowing out of the mixing valve is accurate; the movement of the valve core of the present invention is achieved based on the reaction of the temperature sensing component to the temperature of the liquid flowing through the valve core. Specifically, when the temperature of the liquid flowing into the valve core gradually increases, the temperature sensing component also gradually expands. During the gradual expansion of the temperature sensing component, the valve core is pushed to move, thereby adjusting the degree of connectivity between the pipeline groups. Conversely, the temperature sensing component contracts and drives the valve core to move in the opposite direction. Therefore, the present invention realizes pure mechanical adjustment of the mixed flow ratio of the mixing valve, has a wide range of applications, is not easy to be damaged, and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a structural schematic diagram of a fracturing pump lubrication system provided by the present invention;

[0042] Figure 2 It is a structural schematic diagram of a fracturing pump lubrication system provided by the present invention from another perspective;

[0043] Figure 3 is a schematic diagram of a fracturing pump lubrication system provided by the present invention;

[0044] Figure 4is a schematic diagram of a temperature control assembly provided by the present invention;

[0045] Figure 5 is an exploded view of the mixing valve provided by the present invention;

[0046] Figure 6 It is a structural schematic diagram of the mixing flow valve provided by the present invention;

[0047] Figure 7 is the AA cross-sectional view provided by the present invention;

[0048] Figure 8 It is a structural schematic diagram of the valve core provided by the present invention;

[0049] Fig. 9 It is a BB cross-sectional view provided by the present invention.

[0050] Figure numerals: 1. oil tank, 2. heater, 3. liquid level sensor, 4. first temperature sensor, 5. installation valve, 6. delivery drive, 7. filter, 8. cooler, 9. mixing valve, 90. valve block, 91. valve core installation channel, 92. first input channel, 93. second input channel, 94. output channel, 95. valve core, 96. temperature sensing component, 97. spring, 98. block, 99. mixing zone, 10. second temperature sensor, 11. pressure sensor, 12. flow sensor, 13. fracturing pump, 14. pipeline, 15. pressure measuring joint, 101. first branch pipe, 102. second branch pipe, 19. pipe fittings. DETAILED DESCRIPTION

[0051] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0052] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0053] Embodiment 1:

[0054] Figure 1-9 A fracturing pump lubrication system is shown, including a control system and an oil tank 1, a delivery drive 66 and a fracturing pump 13 that are cyclically connected in sequence. A heater 22 is provided in the oil tank 1. The delivery drive 66 is used to control the flow rate of the lubricating oil. A temperature control component and a sensor component are provided in sequence between the delivery drive 66 and the fracturing pump 13. The temperature control component includes a first branch pipe 101, a second branch pipe 102, a cooler 88 and a mixing valve 99. The first branch pipe 101 is connected in parallel with the second branch pipe 102. The cooler 88 is placed on the first branch pipe 101. The output ends of the first branch pipe 101 and the second branch pipe 102 are respectively connected to the input end of the mixing valve 99. The mixing valve 99 is used to automatically adjust the proportion of the first branch pipe 101 and the second branch pipe 102 connected to the mixing valve 99 according to the temperature of the lubricating oil. The control system is electrically connected to the delivery drive 6, the fracturing pump 13, the heater 2, the sensor component and the temperature control component.

[0055] The lubricating oil in the oil tank 1 enters the fracturing pump 13 through the conveying drive 6, and then returns to the oil tank 1 from the fracturing pump 13, thereby completing the circulation of the lubricating oil. During this circulation process, the lubricating oil lubricates the lubrication end in the fracturing pump 13 to ensure the normal operation of the fracturing pump 13; the stability of the lubrication system during the use of the fracturing pump 13 plays a decisive role in the normal use of the fracturing pump 13. The present application aims at coordinating the temperature, pressure and flow rate of the lubricating oil entering the fracturing pump 13 within a certain parameter range. Specifically, the heater 2 turns on or off or adjusts the temperature of the heater according to the lubricating oil temperature detected by the sensor component; when the lubricating oil temperature is lower than the lower limit of the set range, the heater 2 is turned on, the cooler 8 on the first branch pipe 101 is turned off, and the lubricating oil temperatures in the first branch pipe 101 and the second branch pipe 102 rise synchronously; when the lubricating oil temperature reaches the set range When the temperature of the lubricating oil is within the range set, the cooler 8 on the first branch pipe 101 is opened, and the degree of connectivity between the mixing valve 9 and the first branch pipe 101 and the second branch pipe 102 is controllable, so that the amount of hot oil in the second branch pipe 102 and the cold oil from the first branch pipe 101 mixed in the mixing valve 9 is controllable, ensuring that the temperature of the mixed lubricating oil entering the fracturing pump 13 is controllable; when the temperature of the lubricating oil is higher than the upper limit of the set range, the second branch pipe 102 is not connected to the input end of the mixing valve 9, and all the lubricating oil enters the fracturing pump 13 after being cooled by the cooler 8 from the first branch pipe 101, and the temperature entering the fracturing pump 13 is accurately and effectively regulated; generally speaking, the higher the temperature, the lower the pressure of the lubricating oil, and the greater the flow rate, the pressure and flow rate of the lubricating oil are further adjusted by the conveying drive 6 to ensure the stability of the temperature, pressure and flow rate of the lubricating oil flowing into the fracturing pump 13, thereby ensuring the normal operation of the fracturing pump 13. Moreover, the sensor assembly of the present invention detects the lubricating oil mixed in the mixing valve 9, instead of detecting before the mixing valve as in the prior art, and then adjusting the opening of the mixing valve according to the detection result. Compared with the prior art, the present invention controls the relevant parameters of the lubricating oil entering the fracturing pump 13 more accurately.

[0056] In this embodiment, the control system can receive transmission data from the sensor component, and control the speed of the motor in the conveying drive 6, the start and stop of the fracturing pump 13, the start and stop of the heater 2, and the start and stop of the cooler 8 in the temperature control component according to the data of the sensor component, thereby ensuring the stability and accuracy of the temperature, pressure and flow rate of the lubricating oil flowing into the fracturing pump 13, thereby ensuring the normal operation of the fracturing pump 13.

[0057] In this embodiment, the sensor assembly includes a second temperature sensor 10 , a pressure sensor 11 and a flow sensor 12 disposed at the output end of the mixing valve 9 , and is used to detect the pressure, temperature and flow of the lubricating oil entering the fracturing pump 13 .

[0058] In this embodiment, a liquid level sensor 3 and a first temperature sensor 4 are provided on the oil tank 1 .

[0059] The liquid level sensor 3 ensures that the oil level in the oil tank 1 is within the required range. The first temperature sensor 4 is used to sense the temperature in the oil tank 1 and is connected to a display to display the temperature.

[0060] In this embodiment, the lubrication system further includes a safety valve 5 connected in parallel with the conveying drive 6. The safety valve 5 is electrically connected to the control system. The safety valve 5 ensures that the oil pressure in the lubrication system does not exceed a limit value in any state.

[0061] In this embodiment, the input end of the temperature regulating component is provided with a filter 7. The filter 7 ensures that the lubricating oil entering the fracturing pump 13 is clean, and the filter 7 can be a single-stage filter or a multi-stage filter.

[0062] In this embodiment, the lubrication system includes at least two sets, which are respectively used to connect to the high-pressure lubrication end and the low-pressure lubrication end of the fracturing pump 13 .

[0063] In this embodiment, there are at least two lubrication systems, and the motors of the two gear pumps can both be variable frequency motors, or the high-pressure lubrication end can be a variable frequency motor and the low-pressure lubrication end can be a fixed frequency motor.

[0064] In this embodiment, the conveying drive 6 includes a gear pump and a motor connected to the gear pump.

[0065] The control system can control the pumping amount of the lubricating oil by the gear pump by controlling the speed of the motor, thereby controlling the flow rate and pressure of the lubricating oil passing through the output end of the delivery drive 6.

[0066] In this embodiment, the lubrication system also includes a base, the fracturing pump 13 is placed at one end of the base, the oil tank 1 is placed on one side of the base, the conveying drive 6 is placed on the other side of the base, the cooler 8 is placed above the base, the temperature control component and the sensor component are placed on the base and below the cooler 8, and the oil tank 1, the conveying drive 6, the temperature control component, the sensor component and the fracturing pump 13 are all connected through a pipeline 14. The position design of each component is reasonable, and the space is fully utilized. The oil tank 1 and the conveying drive 6 are on both sides of the base to facilitate later maintenance and subsequent work. The layout method provided in this embodiment is only one of the lubrication systems. The layout position of each component can also be adjusted according to actual needs, and the adjusted layout is also within the protection scope of the present invention.

[0067] In this embodiment, the mixing valve 9 includes a valve block 90, on which is provided a valve core installation channel 91 and a channel group that can be connected to the valve core installation channel 91, a valve core 95 is provided in the valve core installation channel 91, and the valve core 95 is used to adjust the connection ratio between the channel groups; the valve core installation channel 91 is provided with a temperature sensing component 96 that can expand or contract according to temperature, and the temperature sensing component 96 is used to drive the valve core 95 to move axially along the valve core installation channel 91.

[0068] In this embodiment, the temperature sensing element 96 is a temperature bulb.

[0069] In this embodiment, a mixing zone 99 is provided in the valve core 95, and at least two openings are provided on the valve core 95 for connecting the channel group and the mixing zone 99. One end of the temperature sensing element 96 is placed in the mixing zone 99 and connected to the valve core 95, and the other end of the temperature sensing element 96 is fixedly arranged.

[0070] As another embodiment, one end of the valve core 95 is always in communication with the output channel 94 in the channel group, and the valve core 95 is provided with at least two openings communicating with the mixed flow area 99, and the openings can be communicated with the input channel.

[0071] In this embodiment, both ends of the valve core 95 are open, and the temperature sensing element 96 is disposed in the valve core 95 and one end of the temperature sensing element 96 extends out of the valve core 95 and is fixedly connected to the stopper 98 .

[0072] In this embodiment, the valve core 95 is provided with three openings, which are respectively used for connecting the first input channel 92 , the second input channel 93 , and the output channel 94 in the channel group with the mixed flow area 99 .

[0073] In this embodiment, one end of the temperature sensing element 96 is fixed to the stopper 98 and the other end is connected to the valve core 95. When the temperature sensing element 96 expands or contracts, it can drive the valve core 95 to reciprocate.

[0074] In this embodiment, a spring 97 is provided between the valve core 95 and the valve core installation passage 91 .

[0075] In this embodiment, the spring 97 is placed between the temperature sensing member 96 and the end of the valve core installation channel 91. Specifically, the spring 97 is placed at one end of the temperature sensing member 96 away from the stopper 98. The spring 97 is used to reset the temperature sensing member 96 by using its elasticity when no adjustment is required.

[0076] In this embodiment, the channel group includes a first input channel 92, a second input channel 93 and an output channel 94, the mixed flow zone 99 is connected to the output channel 94, and the valve core 95 moves to adjust the connection ratio between the mixed flow zone 99 and the first input channel 92 and the second input channel 93.

[0077] The cold oil in the first branch pipe 101 and the hot oil in the second branch pipe 102 are mixed in the mixing zone 99 of the valve core 95 through the first input channel 92 and the second input channel 93, and then flow into the fracturing pump 13 from the output channel. During the movement of the valve core 95, the mixing zone moves accordingly, so that the ratio of the lubricating oil in the first input channel 92 and the second input channel 93 entering the mixing zone 99 increases and decreases, thereby achieving accurate adjustment of the temperature of the lubricating oil in the mixing zone 99 and ensuring the stability of the temperature of the lubricating oil flowing out of the mixing valve 9 to the fracturing pump 13.

[0078] In this embodiment, the mixing valve 9 is provided with a pressure measuring joint 15, which is connected to the mixing area for testing the pressure of the lubricating oil in the mixing area. The structural design is reasonable, and the pressure of the lubricating oil entering the fracturing pump 13 is effectively and accurately monitored.

[0079] In this embodiment, one end of the valve core installation passage 91 is open, and a stopper 98 connected to the temperature sensing element 96 is provided at the open end.

[0080] In this embodiment, the stopper 98 may be sealedly connected to the open end of the valve core installation passage 91 .

[0081] In this embodiment, the stopper 98 is fixedly connected to one end of the temperature sensing element 96 .

[0082] In this embodiment, the valve block 90 is a cubic structure, and the channel group includes a first input channel 92, a second input channel 93 and an output channel 94. The first input channel 92, the second input channel 93 and the output channel 94 are all connected to the valve core installation channel 91 and are respectively placed on different end faces of the valve block 90.

[0083] In this embodiment, the first input channel 92 and the output channel 94 are disposed on opposite surfaces of the valve block 90 , and the second input channel 93 is disposed on a surface perpendicular to the valve core installation channel 91 .

[0084] In this embodiment, the output channel 94 is connected to the fracturing pump 13 via a pipe 19 , and the sensor assembly is placed on the pipe 19 .

[0085] The working principle of the mixing valve 9 is that when the oil temperature is lower than the set opening temperature, the valve core 95 and the temperature sensing element 96 have not reached the expansion point, the valve core 95 is in a fully open state and does not move, and the cold oil goes directly from the oil tank 1 to each lubrication point; when the temperature is higher than the set opening temperature, the temperature sensing element 96 starts to expand, the valve core 95 enters the working stroke and closes, and the hot oil from the oil tank 1 and the cold oil cooled from the cooler 8 are mixed to each lubrication point; when the set maximum opening temperature is reached, the temperature sensing element 96 is fully expanded, the valve core 95 is in a fully closed state, and the hot oil passes through the cooler 8 before reaching each lubrication point; the start and stop of the cooler 8 is controlled by the mixed oil temperature and the measurement value of the second temperature sensor 10 to ensure that the oil temperature entering each lubrication point is within the required range.

[0086] In this embodiment, the flow sensor 12 controls the minimum oil volume when the fracturing pump 13 is started, and the fracturing pump is stopped immediately when the flow rate is insufficient during operation.

[0087] Embodiment 2:

[0088] like Figure 1-7 A fracturing pump lubrication method is shown, based on the lubrication system described in Example 1, comprising the following steps:

[0089] S1, lubricating oil from oil tank 1 passes through conveying drive 6, temperature regulating component, sensor component and enters fracturing pump 13 in sequence;

[0090] S2, the sensor assembly adjusts the start and stop and / or heating temperature of the heater 2 in the oil tank 1, the delivery amount of the delivery drive 6, the start and stop of the cooler 8, and the ratio of the lubricating oil entering the mixing valve 9 from the second branch pipe 102 and the first branch pipe 101 according to the detected parameters of the lubricating oil, so that the temperature, pressure and flow of the lubricating oil sensed by the sensor assembly are within the set range;

[0091] S3. The lubricating oil flows through the fracturing pump 13 and then returns to the oil tank 1, thus completing the cycle.

[0092] In this embodiment, the lubrication system controls the motor speed of the conveying drive 6, the switch of the heater 2, and the switch of the cooler 8 through the linkage of oil pressure and flow.

[0093] In this embodiment, in step S2, the heater is turned on or off or the temperature is adjusted according to the lubricating oil temperature, specifically including:

[0094] S21, when the sensor assembly detects that the lubricating oil temperature is lower than the lower limit of the set range, the heater 2 is turned on, the cooler 8 on the first branch pipe 101 is turned off, and the lubricating oil temperatures in the first branch pipe 101 and the second branch pipe 102 rise synchronously;

[0095] S22, when the sensor assembly detects that the parameters of the lubricating oil have reached the set range, the cooler 8 on the first branch pipe 101 is turned on, and the mixing valve 9 automatically adjusts the ratio of the first branch pipe 101 and the second branch pipe 102 connected to the mixing valve 9 according to the temperature of the lubricating oil;

[0096] S23, when the sensor assembly detects that the lubricating oil temperature is higher than the maximum upper limit value of the set range, the second branch pipe 102 and the input end of the mixing valve 9 are closed, and the lubricating oil enters the fracturing pump 13 after being cooled from the first branch pipe 101 through the cooler 8.

[0097] In this embodiment, the lubrication system needs to ensure sufficient pressure and flow. When the oil temperature is too low and the flow is not met, the heater 2 can be used to heat the lubricating oil in the oil tank 1. When the flow is met, the heater 2 is turned off. The heater 2 can be multiple sets or a single set. When the oil temperature reaches a certain temperature, the cooler 8 is turned on to ensure that the oil temperature of the lubricating oil entering the lubrication point of the fracturing pump 13 is within the required range. The cooler 8 can be a multiple system or a single set.

[0098] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A fracturing pump lubrication system, comprising a control system and an oil tank (1), a delivery drive (6) and a fracturing pump (13) which are cyclically connected in sequence, wherein a heater (2) is provided in the oil tank (1), and the system is characterized in that: The delivery drive (6) is used to control the flow rate of the lubricating oil. A temperature control component and a sensor component are arranged in sequence between the delivery drive (6) and the fracturing pump (13). The temperature control component comprises a first branch pipe (101), a second branch pipe (102), a cooler (8) and a mixing valve (9). The first branch pipe (101) and the second branch pipe (102) are connected in parallel. The cooler (8) is placed on the first branch pipe (101). The output ends of the first branch pipe (101) and the second branch pipe (102) are respectively connected to the input end of the mixing valve (9). The mixing valve (9) is used to automatically adjust the ratio of the first branch pipe (101) and the second branch pipe (102) to the mixing valve (9) according to the temperature of the lubricating oil. The control system is electrically connected to the conveying drive (6), the fracturing pump (13), the heater (2), the sensor component and the temperature control component.

2. A fracturing pump lubrication system according to claim 1, characterized in that: The sensor assembly comprises a second temperature sensor (10) and / or a pressure sensor (11) and / or a flow sensor (12) disposed at the output end of the mixing valve (9).

3. A fracturing pump lubrication system according to claim 1, characterized in that: The control system is used to control the delivery drive (6) to adjust the flow rate and / or pressure of the fluid at the output end of the mixing valve (9) according to the data transmitted by the sensor component, and the control system controls the heater (2) and / or the temperature control component to adjust the temperature of the fluid.

4. A fracturing pump lubrication system according to claim 1, characterized in that: The oil tank (1) is provided with a liquid level sensor (3) and / or a first temperature sensor (4).

5. A fracturing pump lubrication system according to claim 1, characterized in that: The lubrication system comprises at least two sets, which are respectively used to be connected to the high-pressure lubrication end and the low-pressure lubrication end of the fracturing pump (13).

6. A fracturing pump lubrication system according to claim 1, characterized in that: The lubrication system further comprises a base, the fracturing pump (13) is placed at one end of the base, the oil tank (1) is placed at one side of the base, the conveying drive (6) is placed at the other side of the base, the cooler (8) is placed above the base, the temperature control component and the sensor component are placed on the base and below the cooler (8), and the oil tank (1), the conveying drive (6), the temperature control component, the sensor component and the fracturing pump (13) are all connected via a pipeline (14).

7. A fracturing pump lubrication system according to any one of claims 1 to 6, characterized in that: The mixing valve (9) comprises a valve block (90), the valve block (90) being provided with a valve core installation channel (91) and a channel group connectable to the valve core installation channel (91), a valve core (95) being provided in the valve core installation channel (91), the valve core (95) being used to adjust the connection ratio between the channel groups; a temperature sensing element (96) being provided in the valve core installation channel (91) and capable of expanding or contracting according to temperature, the temperature sensing element (96) being used to drive the valve core (95) to move axially along the valve core installation channel (91).

8. A fracturing pump lubrication system according to claim 7, characterized in that: A mixed flow area (99) is provided in the valve core (95), and at least two openings are provided on the valve core (95) for connecting the channel group and the mixed flow area (99). One end of the temperature sensing element (96) is placed in the mixed flow area (99) and connected to the valve core (95), and the other end of the temperature sensing element (96) is fixedly arranged.

9. A fracturing pump lubrication system according to claim 8, characterized in that: A spring (97) is provided between the valve core (95) and the valve core installation passage (91).

10. A fracturing pump lubrication system according to claim 8, characterized in that: The channel group includes a first input channel (92), a second input channel (93) and an output channel (94); the mixed flow area (99) is connected to the output channel (94); the valve core (95) moves to adjust the communication ratio between the mixed flow area (99) and the first input channel (92) and the second input channel (93).

11. A fracturing pump lubrication system according to claim 8, characterized in that: The mixing valve (9) is provided with a pressure measuring joint (15), and the pressure measuring joint (15) is connected to the mixing area (99) for testing the pressure of the lubricating oil in the mixing area (99).

12. A fracturing pump lubrication system according to claim 7, characterized in that: One end of the valve core installation passage (91) is open, and a stopper (98) connected to the temperature sensing element (96) is provided at the open end.

13. A fracturing pump lubrication system according to claim 7, characterized in that: The valve block (90) is a cubic structure, and the channel group comprises a first input channel (92), a second input channel (93) and an output channel (94); the first input channel (92), the second input channel (93) and the output channel (94) are all connected to the valve core installation channel (91) and are respectively placed on different end surfaces of the valve block (90).

14. A fracturing pump lubrication system according to claim 13, characterized in that: The first input channel (92) and the output channel (94) are disposed on opposite surfaces of the valve block (90), and the second input channel (93) is disposed on a surface perpendicular to the valve core installation channel (91).

15. A fracturing pump lubrication system according to claim 13, characterized in that: The output channel (94) is connected to the fracturing pump (13) via a pipe (19), and the sensor assembly is placed on the pipe (19).

16. A fracturing pump lubrication method, based on the lubrication system according to any one of claims 1 to 15, characterized in that: The following steps are included: S1, lubricating oil enters the fracturing pump (13) from the oil tank (1) through the conveying drive (6), the temperature regulating component, and the sensor component in sequence; S2, the sensor assembly adjusts the start and stop of the heater (2) in the oil tank (1) and / or the heating temperature, adjusts the delivery amount of the delivery drive (6), adjusts the start and stop of the cooler (8), and adjusts the ratio of the lubricating oil entering the mixing valve (9) from the second branch pipe (102) and the first branch pipe (101) according to the parameters of the lubricating oil detected, so that the temperature, pressure and flow rate of the lubricating oil sensed by the sensor assembly are within the set range; S3. The lubricating oil flows through the fracturing pump (13) and then returns to the oil tank (1), thus completing the cycle.

17. A method for lubricating a fracturing pump according to claim 16, characterized in that: In step S2, the heater is turned on or off or the temperature is adjusted according to the lubricating oil temperature, which specifically includes: S21, when the sensor component detects that the lubricating oil temperature is lower than the lower limit of the set range, the heater (2) is turned on, the cooler (8) on the first branch pipe (101) is turned off, and the lubricating oil temperature in the first branch pipe (101) and the second branch pipe (102) rises synchronously; S22, when the sensor assembly detects that the parameters of the lubricating oil have reached a set range, the cooler (8) on the first branch pipe (101) is opened, and the mixing valve (9) automatically adjusts the ratio of the first branch pipe (101) and the second branch pipe (102) connected to the mixing valve (9) according to the temperature of the lubricating oil; S23. When the sensor assembly detects that the lubricating oil temperature is higher than the maximum upper limit value of the set range, the second branch pipe (102) and the input end of the mixing valve (9) are closed, and the lubricating oil flows from the first branch pipe (101) through the cooler (8) to enter the fracturing pump (13) after being cooled.

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