Greasing System of Plug Valve and Fracturing Equipment

Abstract

The present invention discloses a grease injection system for a plug valve and a fracturing device. The grease injection system is used to inject grease into the plug valve. The grease injection system includes a power mechanism and a flow control valve group. The power mechanism includes a driving motor, a hydraulic pump, and a hydraulic oil tank. The driving motor is connected to the hydraulic pump. The hydraulic pump has an oil inlet and a plurality of oil outlets. The oil inlet is communicated with the hydraulic oil tank. The flow control valve group includes a valve body and a control valve. The valve body has a first oil passage port, a second oil passage port, and a third oil passage port. The first oil passage port is communicated with the second oil passage port. The second oil passage port and the third oil passage port are communicated with one or more of the oil outlets. A control valve is arranged between the first oil passage port and the third oil passage port to control the communication or disconnection between the first oil passage port and the third oil passage port. The above solution can solve the problem of great difficulty in injecting grease into the plug valve.

Description

Technical Field

[0001] The present invention relates to the technical field of valve grease injection, and particularly to a grease injection system for a plug valve and a fracturing device. Background Art

[0002] Many plug valves are used in oil fracturing well sites. The viscosity of the grease for plug valves is very high and the fluidity is poor, so it is time-consuming and laborious to inject the grease.

[0003] The main form of injecting grease into plug valves is the direct manual application of grease, that is, when injecting grease, tools such as grease guns are used for manual pressing of grease. This injection method has low efficiency and high labor intensity. Therefore, it is difficult to inject grease into plug valves. Summary of the Invention

[0004] The present invention discloses a grease injection system for a plug valve and a fracturing device to solve the problem of great difficulty in injecting grease into plug valves.

[0005] To solve the above problems, the present invention adopts the following technical solutions:

[0006] A grease injection system for a plug valve, the grease injection system is used to inject grease into the plug valve, and the grease injection system includes:

[0007] A power mechanism, the power mechanism includes a driving motor, a hydraulic pump and a hydraulic oil tank. The driving motor is connected to the hydraulic pump. The hydraulic pump has an oil inlet and a plurality of oil outlets. The oil inlet is communicated with the hydraulic oil tank;

[0008] A flow control valve group, the flow control valve group includes a valve body and a control valve. The valve body has a first oil passage port, a second oil passage port and a third oil passage port. The first oil passage port is communicated with the second oil passage port. The second oil passage port and the third oil passage port are communicated with one or more of the oil outlets. A control valve is arranged between the first oil passage port and the third oil passage port to control the connection or disconnection between the first oil passage port and the third oil passage port;

[0009] A grease injection booster cylinder, the grease injection booster cylinder includes a cylinder body and a piston rod. The piston rod is movably located in the cylinder body. The cylinder body is provided with a piston extension control port and a piston retraction control port. The piston extension control port can be communicated with the first oil passage port to introduce hydraulic oil into the cylinder body to drive the piston rod to extend; the piston retraction control port can be communicated with the first oil passage port to introduce hydraulic oil into the cylinder body to drive the piston rod to retract;

[0010] When the piston rod extends, the first oil port communicates with the second oil port, and the first oil port is disconnected from the third oil port;

[0011] When the piston rod retracts, both the second oil port and the third oil port communicate with the first oil port.

[0012] A fracturing device includes a plug valve and the above-mentioned grease injection system, and the grease injection system is used to inject grease into the plug valve.

[0013] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0014] In the grease injection system disclosed by the present invention, the driving motor drives the hydraulic pump to pump oil from the hydraulic oil tank, and the hydraulic pump provides power for the grease injection booster cylinder, so as to inject grease into the plug valve. In this solution, by setting the driving motor and the hydraulic pump to provide the grease injection pressure, only manual operation of the driving motor is required to realize the automatic grease injection of the plug valve, thereby reducing the manual labor intensity and improving the grease injection efficiency of the plug valve. Therefore, the embodiments of the present application can reduce the difficulty of injecting grease into the plug valve. Description of the Drawings

[0015] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0016] Figure 1 is a schematic structural diagram of the grease injection system disclosed in the embodiment of the present invention;

[0017] Figure 2 is a schematic structural diagram of the hydraulic pump of the grease injection system disclosed in the embodiment of the present invention;

[0018] Figure 3 is a schematic structural diagram of the flow control valve group of the grease injection system disclosed in the embodiment of the present invention;

[0019] Figure 4 is a schematic structural diagram of the electromagnetic control valve group of the grease injection system disclosed in the embodiment of the present invention;

[0020] Figure 5 is a schematic structural diagram of the grease injection booster cylinder of the grease injection system disclosed in the embodiment of the present invention.

[0021] Explanation of the reference numerals:

[0022] 110 - Driving motor, 120 - Hydraulic pump, 121 - Inlet port, 122 - Outlet port, 130 - Hydraulic oil tank, 200 - Flow control valve group, 210 - First oil passage port, 220 - Second oil passage port, 230 - Third oil passage port, 240 - Fourth oil passage port, 250 - Balance valve, 251 - Inlet oil port, 252 - Return oil port, 253 - Pilot port, 260 - First check valve, 270 - First relief valve, 300 - Grease injection booster cylinder, 310 - Cylinder block, 311 - Piston extension control port, 312 - Piston retraction control port, 313 - Grease filling space, 314 - First hydraulic oil filling space, 315 - Second hydraulic oil filling space, 316 - Grease outlet, 320 - Piston rod, 400 - Electromagnetic control valve group, 410 - Valve group inlet, 420 - Valve group outlet, 430 - First solenoid valve, 440 - Second solenoid valve, 450 - Third solenoid valve, 460 - Second check valve, 470 - Second relief valve, 510 - Suction filter, 520 - Suction check valve, 530 - Return oil filter, 540 - Return oil pipeline, 600 - Cock valve. Detailed implementation manners

[0023] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] The following will detail the technical solutions disclosed in each embodiment of the present invention with reference to the drawings.

[0025] As Figures 1 to 5 shown, an embodiment of the present invention discloses a grease injection system for a cock valve 600, and this grease injection system is used to inject grease into the cock valve 600. The disclosed grease injection system includes a power mechanism, a flow control valve group 200, and a grease injection booster cylinder 300.

[0026] The power mechanism is used to provide pressure for the grease of the grease injection system, so as to press the grease into the grease injection position of the plug valve 600. The power mechanism includes a driving motor 110, a hydraulic pump 120 and a hydraulic oil tank 130. The driving motor 110 is connected to the hydraulic pump 120, and the driving motor 110 is used to provide the power for pumping liquid for the hydraulic pump 120. The driving motor 110 can be a three-phase asynchronous motor or a servo motor. Of course, the driving motor 110 can also have other structures, which are not limited in this article. The hydraulic pump 120 can be a plunger pump, a gear pump or a vane pump. The specific type of the hydraulic pump 120 is not limited in this article. The hydraulic pump 120 has an oil inlet 121 and a plurality of oil outlets 122, and the oil inlet 121 is communicated with the hydraulic oil tank 130.

[0027] The flow control valve group 200 includes a valve body and a control valve. The valve body has a first oil passage port 210, a second oil passage port 220 and a third oil passage port 230. The first oil passage port 210 is communicated with the second oil passage port 220. The second oil passage port 220 and the third oil passage port 230 are communicated with one or more of the oil outlets 122. A control valve is arranged between the first oil passage port 210 and the third oil passage port 230, and is used to control the communication or disconnection between the first oil passage port 210 and the third oil passage port 230. At this time, the communication or disconnection between the first oil passage port 210 and the third oil passage port 230 is controlled by the control valve. The first oil passage port 210 and the second oil passage port 220 are in a normally open state.

[0028] The grease injection booster cylinder 300 presses the grease into the grease injection position of the plug valve 600 through the power provided by the hydraulic pump 120. The grease injection booster cylinder 300 includes a cylinder body 310 and a piston rod 320. The cylinder body 310 provides an installation base for other components of the grease injection booster cylinder 300. The piston rod 320 is movably located in the cylinder body 310. The cylinder body 310 is provided with a piston extension control port 311 and a piston retraction control port 312. The piston extension control port 311 can be communicated with the first oil passage port 210, and is used to introduce hydraulic oil into the cylinder body 310 to drive the piston rod 320 to extend. When the piston rod 320 extends, the piston rod 320 applies pressure to the grease, so as to press the grease into the grease injection position of the plug valve 600. The piston retraction control port 312 can be communicated with the first oil passage port 210, and is used to introduce hydraulic oil into the cylinder body 310 to drive the piston rod 320 to retract. When the piston rod 320 retracts, the piston rod 320 removes the pressure on the grease, so that the grease injection system can be refilled with grease. The extending direction and the retracting direction of the piston rod 320 are two parallel and opposite directions.

[0029] When the piston rod 320 extends, the first oil port 210 is connected to the second oil port 220, and the first oil port 210 and the third oil port 230 are disconnected. At this time, only the hydraulic oil introduced through the second oil port 220 enters the first oil port 210, and the hydraulic oil introduced through the third oil port 230 does not enter the first oil port 210.

[0030] When the piston rod 320 retracts, both the second oil port 220 and the third oil port 230 are connected to the first oil port 210. At this time, both the hydraulic oil introduced through the second oil port 220 and the hydraulic oil introduced through the third oil port 230 enter the first oil port 210. Therefore, the flow rate of the hydraulic oil introduced when the piston rod 320 retracts is greater than the flow rate of the hydraulic oil introduced when the piston rod 320 extends. Therefore, the piston rod 320 can retract quickly when retracting.

[0031] During the specific grease injection operation, when injecting grease into the plug valve 600, the drive motor 110 is started, and the hydraulic pump 120 pumps hydraulic oil from the hydraulic oil tank 130. The hydraulic oil enters the hydraulic pump 120 through the oil inlet 121 of the hydraulic pump 120, and then the hydraulic oil is introduced into the second oil port 220 and the third oil port 230 through the oil outlet 122. Since the third oil port 230 is disconnected from the first oil port 210, only the hydraulic oil introduced through the second oil port 220 enters the first oil port 210, and then enters the cylinder body 310 of the grease injection booster cylinder 300 through the piston extension control port 311. The hydraulic oil provides pressure for the piston rod 320, thereby driving the piston rod 320 to extend.

[0032] After the grease injection is completed, it is necessary to drive the piston rod 320 of the grease injection booster cylinder 300 to the position before extension to prepare for the next grease injection and to facilitate the re - addition of grease to the grease injection system. The drive motor 110 is started, and the hydraulic pump 120 pumps hydraulic oil from the hydraulic oil tank 130. The hydraulic oil enters the hydraulic pump 120 through the oil inlet 121 of the hydraulic pump 120, and then the hydraulic oil is introduced into the second oil port 220 and the third oil port 230 through the oil outlet 122. At this time, the third oil port 230 is connected to the first oil port 210. Therefore, both the hydraulic oil introduced through the second oil port 220 and the third oil port 230 enter the first oil port 210, and then enter the cylinder body 310 of the grease injection booster cylinder 300 through the piston retraction control port 312. The hydraulic oil provides pressure for the piston rod 320, thereby driving the piston rod 320 to retract.

[0033] In the embodiments disclosed in the present application, a grease injection pressure is provided by setting a drive motor 110 and a hydraulic pump 120. Therefore, only manual operation of the drive motor 110 is required to achieve automatic grease injection for the plug valve 600, thereby reducing the labor intensity of workers and improving the grease injection efficiency of the plug valve 600. Therefore, the grease injection system provided by the embodiments of the present application can reduce the difficulty of injecting grease into the plug valve.

[0034] In addition, in the embodiments disclosed in the present application, when injecting grease into the plug valve 600, the flow rate of the hydraulic oil flowing into the grease injection booster cylinder 300 is small. Therefore, the extension movement speed of the piston rod 320 is slow, which is convenient for injecting grease into the plug valve 600. After the grease injection of the plug valve 600 is completed, the flow rate of the hydraulic oil flowing into the grease injection booster cylinder 300 is large. Therefore, the retraction movement speed of the piston rod 320 is fast, so that the piston rod 320 retracts quickly. Therefore, in the present application, a small flow rate is adopted when the piston rod 320 extends, and a large flow rate is adopted when retracting. Therefore, it can not only meet the grease injection requirements but also improve the grease injection efficiency.

[0035] In the above embodiments, the control valve can be a three-way valve. When the piston rod 320 extends, the third oil port 230 is connected to the hydraulic oil tank 130 through the three-way valve. Therefore, the hydraulic oil entering the third oil port 230 directly returns to the hydraulic oil tank 130. When the piston rod 320 retracts, the third oil port 230 is connected to the first oil port 210 through the three-way valve and is disconnected from the hydraulic oil tank 130. Therefore, the hydraulic oil introduced into the third oil port 230 is introduced into the first oil port 210.

[0036] In the above embodiments, the cylinder block 310 can be provided with an accommodation space. The piston rod 320 can be located in the accommodation space. The accommodation space can include a first hydraulic oil filling space 314 and a second hydraulic oil filling space 315 that are arranged separately along the telescopic direction of the piston rod 320. The piston extension control port 311 is connected to the second hydraulic oil filling space 315. When the piston rod 320 extends, the hydraulic oil is introduced into the second hydraulic oil filling space 315 through the piston extension control port 311. The piston retraction control port 312 is connected to the first hydraulic oil filling space 314. When the piston rod 320 retracts, the hydraulic oil is introduced into the first hydraulic oil filling space 314 through the piston retraction control port 312.

[0037] In the above solution, when the piston rod 320 extends, it is necessary to introduce hydraulic oil into the second hydraulic oil filling space 315, and at the same time, it is also necessary to discharge the first hydraulic oil filling space 314. In order to simplify the grease injection booster cylinder 300, when the piston rod 320 extends, the piston retraction control port 312 can be used to discharge the hydraulic oil in the first hydraulic oil filling space 314. At this time, the piston retraction control port 312 can be used for oil return to return the hydraulic oil to the hydraulic oil tank 130.

[0038] Similarly, when the piston rod 320 retracts, the piston extension control port 311 can be used to discharge the hydraulic oil in the second hydraulic oil filling space 315. At this time, the piston extension control port 311 can be used for oil return to return the hydraulic oil to the hydraulic oil tank 130.

[0039] This solution does not require a separate port for oil return to be opened on the cylinder block 310. The piston extension control port 311 and the piston retraction control port 312 are both used as oil return ports.

[0040] In the above embodiment, the volumes of the first hydraulic oil filling space 314 and the second hydraulic oil filling space 315 change as the piston rod 320 moves.

[0041] In another alternative embodiment, the control valve may include a first one-way valve 260. The first oil passage port 210 and the third oil passage port 230 can be connected through the first one-way valve 260. When the pressure at the first oil passage port 210 is greater than or equal to the pressure at the third oil passage port 230, the first one-way valve 260 opens; when the pressure at the first oil passage port 210 is less than the pressure at the third oil passage port 230, the first one-way valve 260 closes. The pressure at the first oil passage port 210 here refers to the reaction force of the hydraulic oil on the piston rod 320. When the piston rod 320 extends, the grease has a greater reaction force on the piston rod 320. Therefore, the piston rod 320 has a greater acting force on the hydraulic oil that drives its movement.

[0042] When the piston rod 320 extends, the reaction force of the grease on the piston rod 320 is greater. Therefore, the pressure at the third oil passage port 230 is greater than or equal to the pressure at the first oil passage port 210, causing the first one-way valve 260 to close. Thus, the first oil passage port 210 is disconnected from the third oil passage port 230. When the piston rod 320 retracts, the piston rod 320 presses out the hydraulic oil in the above-mentioned second hydraulic oil filling space 315. Therefore, the reaction force on the piston rod 320 is the hydraulic oil in the second hydraulic oil filling space 315. Therefore, the reaction force on the piston rod 320 is smaller. Therefore, the pressure at the first oil passage port 210 is smaller. The pressure at the first oil passage port 210 is less than the pressure at the third oil passage port 230. Therefore, the first one-way valve 260 opens, and the first oil passage port 210 is connected to the third oil passage port 230.

[0043] In this solution, by the different pressures received when the piston rod 320 extends and retracts, the first one-way valve 260 is used to control the connection and disconnection between the first oil passage port 210 and the third oil passage port 230, thus simplifying the structure of the grease injection system and facilitating the control of the grease injection system. In addition, the automation performance of the grease injection system is further improved.

[0044] In another alternative embodiment, the valve body may further have a fourth oil port 240, and the fourth oil port 240 may communicate with the hydraulic oil tank 130. The control valve may further include a balance valve 250. The balance valve 250 has an inlet port 251, an oil return port 252, and a pilot port 253. The third oil port 230 may be connected to the inlet port 251. The oil return port 252 may be connected to the fourth oil port 240. The pilot port 253 is connected to the first oil port 210. The pilot port 253 is used to measure the pressure of the first oil port 210.

[0045] When the piston rod 320 extends, the reaction force of the grease on the piston rod 320 is relatively large. Therefore, the pressure of the first oil port 210 is relatively large, and the pressure of the pilot port 253 is relatively large. When the pressure of the pilot port 253 is greater than or equal to the first preset pressure, the inlet port 251 is connected to the oil return port 252. At this time, the hydraulic oil introduced from the third oil port 230 returns to the hydraulic oil tank 130 through the inlet port 251, the oil return port 252, and the fourth oil port 240.

[0046] When the piston rod 320 retracts, the pressure on the piston rod 320 is relatively small. Therefore, the pressure at the first oil port 210 is relatively small, and the pressure of the pilot port 253 is relatively small. When the pressure of the pilot port 253 is less than the first preset pressure, the inlet port 251 is disconnected from the oil return port 252.

[0047] In this solution, the pressure of the first oil port 210 is measured through the pilot port 253 of the balance valve 250, and the connection and disconnection between the third oil port 230 and the hydraulic oil tank 130 are controlled according to the pressure of the pilot port 253, thereby further improving the automation performance of the grease injection system.

[0048] Specifically, the first preset pressure can be flexibly selected according to the pressure guiding ratio of the balance valve 250. The pressure guiding ratio of the balance valve 250 in this application can be 3:1. When the set pressure of the balance valve 250 is A, the first preset pressure is A / 3. For example, the set pressure of the balance valve 250 can be 3000 psi, and the first preset pressure can be 1000 psi.

[0049] Further, the control valve may further include a first overflow valve 270. The first oil port 210 may be connected to the fourth oil port 240 through the first overflow valve 270. When the pressure of the first oil port 210 is greater than the second preset pressure, the first overflow valve 270 opens to connect the first oil port 210 and the fourth oil port 240. When the pressure of the first oil port 210 is less than the second preset pressure, the first overflow valve 270 closes to disconnect the first oil port 210 and the fourth oil port 240. Among them, the second preset pressure may be greater than the first preset pressure.

[0050] The second preset pressure here can be the highest pressure set for the grease injection system, that is, the highest pressure that the grease injection system can withstand. When the pressure exceeds this value, the grease injection system is prone to damage due to overload. Therefore, when the pressure at the first oil passage port 210 is greater than the second preset pressure, the first overflow valve 270 opens, thereby relieving the pressure of the grease injection system to ensure the safety and reliability of the grease injection system.

[0051] In the above embodiment, the grease injection system may further include a grease storage container for storing grease. The grease storage container can be connected to the grease injection booster cylinder 300. The grease injection booster cylinder 300 applies pressure to the grease in the grease storage container, and the grease in the grease storage container is pushed out of the grease storage container and enters the cock valve 600 to complete the grease injection operation.

[0052] In the above solution, the grease injection system needs to be provided with a grease storage container and a pipeline connecting the grease storage container to the grease injection booster cylinder 300. Therefore, the grease injection system has more components and the connection is relatively cumbersome.

[0053] Based on this, in another alternative embodiment, the accommodation space may further include a grease filling space 313. The grease filling space 313, the first hydraulic oil filling space 314, and the second hydraulic oil filling space 315 are arranged in isolation in sequence along the telescopic direction of the piston rod 320. That is to say, the grease filling space 313, the first hydraulic oil filling space 314, and the second hydraulic oil filling space 315 are not connected to each other. The cylinder block 310 is also provided with a grease outlet 316, and the grease outlet 316 is connected to the grease filling space 313. During the telescopic process of the piston rod 320, the volumes of the grease filling space 313, the first hydraulic oil filling space 314, and the second hydraulic oil filling space 315 change.

[0054] During the specific working process, when the second hydraulic oil filling space 315 is filled with hydraulic oil, the piston rod 320 extends, thereby compressing the grease filling space 313, and further pressing the grease out of the grease outlet 316. When the first hydraulic oil filling space 314 is filled with hydraulic oil, the piston rod 320 retracts, thereby increasing the grease filling space 313. Therefore, the grease filling space 313 can be refilled with grease.

[0055] In this solution, the grease injection booster cylinder 300 itself is provided with a space for storing grease, so there is no need to separately provide a grease storage container, which simplifies the structure of the grease injection system and makes the structure of the grease injection system simpler.

[0056] In another alternative embodiment, the grease injection system may further include an electromagnetic control valve group 400. The flow control valve group 200 and the grease injection booster cylinder 300 may be connected through the electromagnetic control valve group 400. In this solution, the electromagnetic control valve group 400 is used to control the conduction or disconnection between the flow control valve group 200 and the grease injection booster cylinder 300. Therefore, the overall grease injection operation control of the grease injection system can be realized, further improving the automatic operation of the grease injection system, and further reducing the manual labor intensity.

[0057] Specifically, the electromagnetic control valve group 400 may include a valve group inlet 410, a valve group outlet 420, at least one first electromagnetic valve 430, at least one second electromagnetic valve 440, at least one third electromagnetic valve 450, at least one second one-way valve 460, and at least one second overflow valve 470. The first electromagnetic valve 430 and the second overflow valve 470 are connected in parallel between the valve group inlet 410 and the valve group outlet 420. The valve group inlet 410 may be connected to the first oil port 210, and the valve group outlet 420 may be connected to the hydraulic oil tank 130. At this time, both the first electromagnetic valve 430 and the second overflow valve 470 can be used for the pressure relief of the hydraulic pump 120. When the first electromagnetic valve 430 is de-energized, the hydraulic oil introduced at the valve group inlet 410 directly reaches the valve group outlet 420, thereby realizing the unloading of the hydraulic pump 120. When the first electromagnetic valve 430 is energized, the hydraulic oil introduced at the valve group inlet 410 can build pressure at the inlets of the downstream electromagnetic valves. For example, pressure can be built at the inlets of the electromagnetic valves such as the second one-way valve 460, the second electromagnetic valve 440, and the third electromagnetic valve 450 in the following text. When the pressure of the grease injection system exceeds the maximum pressure, the pressure relief operation can be performed through the second overflow valve 470.

[0058] A second one-way valve 460, a second electromagnetic valve 440, and a third electromagnetic valve 450 may be provided between the valve group inlet 410 and the grease injection booster cylinder 300. The second one-way valve 460 is used to prevent the piston rod 320 from retracting under the action of the internal grease expansion force of the grease injection booster cylinder 300. At the same time, the position locking of the grease injection booster cylinder 300 can be realized during the grease injection process. The second electromagnetic valve 440 is used to control the connection or disconnection between the valve group inlet 410 and the piston extension control port 311, and the third electromagnetic valve 450 is used to control the connection or disconnection between the valve group inlet 410 and the piston retraction control port 312. Among the second electromagnetic valve 440 and the third electromagnetic valve 450 connected to the same grease injection booster cylinder 300, only one of them is energized and the other is de-energized at the same time.

[0059] In this solution, through the first electromagnetic valve 430, the second electromagnetic valve 440, the third electromagnetic valve 450, the second one-way valve 460, and the second overflow valve 470, more precise control operations can be performed on the grease injection system, thereby further improving the automatic performance of the grease injection system.

[0060] Of course, the electromagnetic control valve group 400 in the grease injection system is not limited to the several solenoid valves mentioned above, and may also include other solenoid valves, which are not restricted in this article.

[0061] Optionally, the first solenoid valve 430 may be a two-way two-position solenoid valve, and the second solenoid valve 440 and the third solenoid valve 450 may be two-way three-position solenoid valves. Of course, the specific types of the first solenoid valve 430, the second solenoid valve 440, and the third solenoid valve 450 can be flexibly selected according to the actual working conditions, which are not restricted in this article.

[0062] In another alternative embodiment, the grease injection system may further include an oil suction filter 510 and an oil suction check valve 520, and the oil suction filter 510 and the oil suction check valve 520 may be arranged between the oil inlet 121 and the hydraulic oil tank 130. In this solution, the oil suction filter 510 can filter the hydraulic oil sucked by the hydraulic pump 120, thereby preventing impurities in the hydraulic oil from clogging the components of the grease injection system, and thus further improving the safety of the grease injection system. In addition, the oil suction check valve 520 prevents the phenomenon of back suction between the hydraulic pump 120 and the hydraulic oil tank 130, further improving the reliability of the grease injection system.

[0063] In another alternative embodiment, the grease injection system may further include an oil return filter 530 and an oil return pipeline 540, and the oil return pipeline 540 is used to return the hydraulic oil to the hydraulic oil tank 130, and the above-mentioned oil return ports are all connected to the hydraulic oil tank 130 through the oil return pipeline 540. The oil return filter 530 may be arranged in the oil return pipeline 540. In this solution, the oil return filter 530 can filter the hydraulic oil returned to the hydraulic oil tank 130, thereby preventing impurities carried in the hydraulic oil from entering the hydraulic oil tank 130, and further extending the service life of the hydraulic oil.

[0064] In order to improve the grease injection efficiency, in another alternative embodiment, each flow control valve group 200 is connected to a plurality of grease injection intensifying cylinders 300, and the number of flow control valve groups 200 may be multiple. This solution can simultaneously inject grease into multiple cock valves 600 or can use multiple grease injection intensifying cylinders 300 to simultaneously inject grease into the same cock valve 600 at multiple positions, which can further improve the grease injection efficiency.

[0065] In a specific embodiment, as shown in the appendix Figure 2As shown, the hydraulic pump 120 can be a radial piston pump. The radial piston pump includes an oil inlet 121 and five oil outlets 122, which are P1, P2, P3, P4, and P5 respectively. Each oil outlet 122 serves as an independent hydraulic source. The flow rate of the hydraulic oil output from each oil outlet 122 can be the same or different. The number of the flow control valve groups 200 can be two. The second oil passage port 220 of one flow control valve group 200 is connected to P1, and the third oil passage port 230 is connected to P2. The second oil passage port 220 of the other flow control valve group 200 is connected to P4, and the third oil passage port 230 is connected to P5. P3 is connected to the hydraulic oil tank 130. At this time, the piston corresponding to P3 basically does not do work, so the power consumption is relatively low.

[0066] When the pressure at the first oil passage port 210 is lower than the first preset pressure, the flow rate output from the first oil passage port 210 is the confluence of the flow rates of the piston pumps P1, P2 or P4, P5 at this time. When the pressure at the first oil passage port 210 is higher than or equal to the first preset pressure, the first oil passage port 210 only outputs the flow rate of the piston pump P1 or P5 at this time. The flow rates of the piston pumps P2 or P4 directly flow into the hydraulic oil tank 130, that is, the pistons corresponding to the piston pumps P2 or P4 basically do not do work, and the power consumption thereof is very low. In this way, it can be ensured that the motor has more power to be distributed to the pistons corresponding to the P1 or P5 ports, so as to make the P1 or P5 ports reach a higher pressure. When the pressure at the first oil passage port 210 is lower than the first preset pressure, the confluence of P1 and P2 or P4 and P5 can provide a larger flow rate for the low-load actuating components, so as to reach a higher moving speed.

[0067] In the above embodiment, P1, P2 or P4, P5 can be respectively connected to the corresponding flow control valve groups 200. Therefore, more grease can be injected into the corresponding plug valves 600, further improving the greasing efficiency.

[0068] Optionally, the valves between the valve groups and the ports in the above embodiment can be connected through high-pressure pipelines. The high-pressure pipelines can be flexible pipelines or rigid pipelines, and this is not limited in this article.

[0069] Based on the greasing system of any one of the above embodiments of the present application, the present application also discloses a fracturing device, and the disclosed fracturing device has the greasing system of any one of the above embodiments.

[0070] The pressure device disclosed in the present application can be a skid-mounted fracturing device or a vehicle-mounted fracturing device, and this is not limited in this article.

[0071] In the above embodiments of the present invention, the differences between the various embodiments are mainly described. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a more optimal embodiment. For the sake of brevity in writing, they will not be elaborated here.

[0072] The above are only the embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A grease injection system for a plug valve, characterized in that, The grease injection system is used to inject grease into the plug valve (600), and the grease injection system includes: A power mechanism, the power mechanism includes a driving motor (110), a hydraulic pump (120) and a hydraulic oil tank (130), the driving motor (110) is connected to the hydraulic pump (120), the hydraulic pump (120) has an oil inlet (121) and a plurality of oil outlets (122), and the oil inlet (121) is communicated with the hydraulic oil tank (130); A flow control valve group (200), the flow control valve group (200) includes a valve body and a control valve, the valve body has a first oil passage port (210), a second oil passage port (220) and a third oil passage port (230), the first oil passage port (210) is communicated with the second oil passage port (220), the second oil passage port (220) and the third oil passage port (230) are communicated with one or more of the oil outlets (122), and a control valve is arranged between the first oil passage port (210) and the third oil passage port (230) for controlling the communication or disconnection between the first oil passage port (210) and the third oil passage port (230); A grease injection booster cylinder (300), the grease injection booster cylinder (300) includes a cylinder body (310) and a piston rod (320), the piston rod (320) is movably located in the cylinder body (310), the cylinder body (310) is provided with a piston extension control port (311) and a piston retraction control port (312), the piston extension control port (311) can be communicated with the first oil passage port (210) for introducing hydraulic oil into the cylinder body (310) to drive the piston rod (320) to extend; the piston retraction control port (312) can be communicated with the first oil passage port (210) for introducing hydraulic oil into the cylinder body (310) to drive the piston rod (320) to retract; When the piston rod (320) extends, the first oil passage port (210) is communicated with the second oil passage port (220), and the first oil passage port (210) and the third oil passage port (230) are disconnected; When the piston rod (320) retracts, both the second oil passage port (220) and the third oil passage port (230) are communicated with the first oil passage port (210).

2. The grease injection system according to claim 1, wherein The control valve includes a first check valve (260), and the first oil passage port (210) and the third oil passage port (230) are communicated through the first check valve (260); When the pressure of the first oil passage port (210) is greater than or equal to the pressure of the third oil passage port (230), the first check valve (260) opens; when the pressure of the first oil passage port (210) is less than the pressure of the third oil passage port (230), the first check valve (260) closes.

3. The grease injection system according to claim 2, wherein The valve body also has a fourth oil passage port (240), and the fourth oil passage port (240) is communicated with the hydraulic oil tank (130); The control valve further includes a balance valve (250), the balance valve (250) having an inlet port (251), an oil return port (252), and a pilot port (253). The third oil passage port (230) is in communication with the inlet port (251), the oil return port (252) is in communication with the fourth oil passage port (240), and the pilot port (253) is in communication with the first oil passage port (210). When the pressure at the pilot port (253) is greater than or equal to a first preset pressure, the inlet port (251) is in communication with the oil return port (252). When the pressure at the pilot port (253) is less than the first preset pressure, the inlet port (251) is disconnected from the oil return port (252).

4. The greasing system according to claim 3, characterized in that, The control valve further includes a first relief valve (270), the first oil passage port (210) and the fourth oil passage port (240) being in communication through the first relief valve (270). When the pressure at the first oil passage port (210) is greater than a second preset pressure, the first relief valve (270) opens to put the first oil passage port (210) and the fourth oil passage port (240) in communication. When the pressure at the first oil passage port (210) is less than the second preset pressure, the first relief valve (270) closes to disconnect the first oil passage port (210) from the fourth oil passage port (240). Wherein, the second preset pressure is greater than the first preset pressure.

5. The greasing system according to claim 1, characterized in that The cylinder block (310) is provided with an accommodation space, the piston rod (320) being located within the accommodation space. The accommodation space includes a grease filling space (313), a first hydraulic oil filling space (314), and a second hydraulic oil filling space (315) that are sequentially arranged in isolation along the telescopic direction of the piston rod (320). The cylinder block (310) is further provided with a grease outlet (316), the grease outlet (316) being in communication with the grease filling space (313). The piston extension control port (311) is in communication with the second hydraulic oil filling space (315), and the piston retraction control port (312) is in communication with the first hydraulic oil filling space (314).

6. The grease injection system according to claim 1, characterized in that, The grease injection system further includes an electromagnetic control valve group (400), the flow control valve group (200) and the grease injection booster cylinder (300) being connected through the electromagnetic control valve group (400).

7. The greasing system according to claim 6, characterized in that, The electromagnetic control valve group (400) includes a valve group inlet (410), a valve group outlet (420), at least one first solenoid valve (430), at least one second solenoid valve (440), at least one third solenoid valve (450), at least one second check valve (460) and at least one second relief valve (470). The first solenoid valve (430) and the second relief valve (470) are connected in parallel between the valve group inlet (410) and the valve group outlet (420). The valve group inlet (410) is communicated with the first oil port (210). The valve group outlet (420) is communicated with the hydraulic oil tank (130). A second check valve (460), a second solenoid valve (440) and a third solenoid valve (450) are arranged between the valve group inlet (410) and the grease injection booster cylinder (300). The second solenoid valve (440) is used to control the connection or disconnection between the valve group inlet (410) and the piston extension control port (311). The third solenoid valve (450) is used to control the connection or disconnection between the valve group inlet (410) and the piston retraction control port (312).

8. The greasing system according to claim 1, characterized in that, The grease injection system further includes an oil suction filter (510) and an oil suction check valve (520). The oil suction filter (510) and the oil suction check valve (520) are arranged between the oil inlet (121) and the hydraulic oil tank (130).

9. The greasing system according to claim 1, wherein, The grease injection system further includes an oil return filter (530) and an oil return pipeline (540). The oil return pipeline (540) is used to return hydraulic oil to the hydraulic oil tank (130). The oil return filter (530) is arranged on the oil return pipeline (540).

10. The greasing system according to claim 1, characterized in that, Each of the flow control valve groups (200) is connected to a plurality of the grease injection booster cylinders (300), and the number of the flow control valve groups (200) is plural.

11. A fracturing device, characterized in that, It includes a plug valve (600) and the grease injection system according to any one of claims 1 to 10. The grease injection system is used to inject lubricating grease into the plug valve (600).

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