Vacuum oil injection system and method

Abstract

The application discloses a kind of vacuum oil injection system and oil injection method, it is related to while drilling surveying instrument technical field, to solve the problem that existing vacuum hydraulic oil injection device cannot quantitative injection, the system includes measuring tank, measuring tank is equipped with liquid level detector for real-time detection liquid level height in measuring tank, measuring tank is also equipped with vacuum gauge for real-time detection vacuum degree of oil liquid in measuring tank, measuring tank oil outlet connects the one end of oil inlet pipe, and outlet is equipped with first electromagnetic valve, the other end of oil inlet pipe is equipped with first joint, the one end of oil return pipe is connected to the oil return port of measuring tank, the other end of oil return pipe is equipped with the second joint of detachable connection with first joint, motor pump is equipped on oil inlet pipe, air pump is communicated with the air extraction port of measuring tank, controller is signal connected with liquid level detector, vacuum gauge, first electromagnetic valve, motor pump and air pump, thus, it is realized to the quantitative injection of hydraulic equipment while reducing the difficulty of emptying in the process of injection, improve injection efficiency.

Description

Technical Field

[0001] This invention relates to the field of measurement-while-drilling instruments, and more specifically, to a vacuum oil injection system and oil injection method. Background Technology

[0002] In recent years, with economic development, the demand for energy sources such as oil and natural gas has increased, leading to a surge in oil drilling workload. Rotary steerable systems can greatly improve drilling efficiency, and push-type rotary steerable drilling systems, as one of the most important types, have seen large-scale engineering applications. The hydraulic module is a key component of the push-type rotary steerable system. Its main function is to execute steerable commands, guiding drilling according to commands such as increasing azimuth, decreasing azimuth, increasing azimuth, decreasing azimuth, azimuth maintenance, and wellbore inclination maintenance, completing the wellbore trajectory drilling task according to the requirements of engineers and geologists. To ensure the hydraulic module can successfully complete steerable commands, its stability and reliability must be guaranteed. The stability and reliability of the hydraulic module unit depend not only on the performance of components and materials but also, to a large extent, on the vacuum degree of the injected hydraulic oil. If the hydraulic oil contains air bubbles, these bubbles will expand under the high temperature downhole, creating cavities. This causes accelerated wear of components and expansion and deformation of the rubber sleeve, resulting in elasticity in the push-type system, preventing it from rigidly completing the steerable function and even leading to wellbore inclination errors. Furthermore, this will significantly reduce the service life of the hydraulic module.

[0003] Patent application number 201921351264.6 discloses a vacuum hydraulic oil injection device for oil drilling, including a circulation system, a vacuum system, a balance system, and a control system. It can perform vacuum oil injection of a rotary guide hydraulic module. Secondly, it can ensure pressure balance during the oil injection process and achieve a certain degree of automatic control. However, the shortcomings are that the vacuum degree of the hydraulic oil is insufficient and the process is slow, and the hydraulic oil injection status cannot be known. Usually, continuous circulation oil injection for eight hours is considered to be completed. This not only results in low oil injection efficiency, but also fails to guarantee the vacuum degree. Even if a cavity is formed inside the hydraulic unit, it cannot be known.

[0004] Therefore, how to solve the problem that existing vacuum hydraulic oil injection devices cannot inject oil in a quantitative manner is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a vacuum oil injection system that can reduce the difficulty of venting during the oil injection process while realizing quantitative oil injection into hydraulic equipment, thereby greatly improving the oil injection efficiency of hydraulic equipment.

[0006] Another objective of this invention is to provide an oil injection method including the above-mentioned vacuum oil injection system, which can achieve quantitative oil injection into hydraulic equipment, while also reducing the difficulty of venting during the oil injection process and improving the oil injection efficiency of hydraulic equipment.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A vacuum oil injection system, comprising:

[0009] The metering tank is equipped with a level detector for real-time detection of the liquid level in the metering tank, and a vacuum gauge for real-time detection of the vacuum degree of the oil in the metering tank. The oil outlet of the metering tank is connected to one end of the oil inlet pipe, and the oil outlet is equipped with a first solenoid valve. The other end of the oil inlet pipe is equipped with a first connector. The oil return port of the metering tank is connected to one end of the oil return pipe, and the other end of the oil return pipe is equipped with a second connector that is detachably connected to the first connector. The oil inlet pipe is equipped with a motor pump.

[0010] An air pump is connected to the air extraction port of the metering tank;

[0011] The controller is connected to the level detector, vacuum gauge, first solenoid valve, motor pump, and air pump via signal connection.

[0012] Preferably, the metering tank is also equipped with a temperature sensor that is connected to the controller signal. The temperature sensor is used to detect the temperature of the oil in the metering tank in real time and send the measured temperature to the controller in real time.

[0013] Preferably, the metering tank includes a body and a heating element surrounding the body in the circumferential direction. The heating element extends along the height direction of the body, is signal-connected to a controller, and has a heat insulation structure on its exterior.

[0014] Preferably, the body has a cylindrical structure, and the body is also equipped with a level gauge for measuring and displaying the oil level inside the body.

[0015] Preferably, it also includes an oil tank, the oil inlet of which is connected to an oil supply device, and the oil outlet of which is connected to the oil inlet of a metering tank via an oil supply pipe.

[0016] Preferably, the top of the oil tank is equipped with an air extraction port, which is connected to an air extraction pump through an air extraction pipe.

[0017] Preferably, a second solenoid valve is provided on the oil supply pipe and a third solenoid valve is provided on the oil inlet pipe. Both the second and third solenoid valves are two-position three-way solenoid valves. The valve port C of the second solenoid valve is connected to the valve port F of the third solenoid valve through a return pipe. Both the second and third solenoid valves are connected to the controller signal.

[0018] Preferably, the oil tank is equipped with a liquid level sensor that is connected to the controller signal. The liquid level sensor is used to detect the height of the oil in the oil tank in real time and send the measured liquid level height to the controller in real time.

[0019] Preferably, a fourth solenoid valve is provided on the suction pipe connecting the suction pump to the oil tank, a fifth solenoid valve is provided on the suction pipe connecting the suction pump to the metering tank, and a sixth solenoid valve is provided on the pipe connecting the oil tank to the oil supply device. The fourth, fifth, and sixth solenoid valves are all connected to the controller signal and are all one-way solenoid valves. The fourth solenoid valve is a normally open solenoid valve, and the first, second, third, fifth, and sixth solenoid valves are all normally closed solenoid valves.

[0020] An oil injection method, applied to the aforementioned vacuum oil injection system, the oil injection method comprising:

[0021] Control the air pump and the sixth solenoid valve to open, so that the oil supply device supplies oil to the oil tank;

[0022] When the controller receives a signal that the oil level in the tank has reached the required level, it controls the second and fifth solenoid valves to open, and at the same time controls the fourth solenoid valve to close, so that the tank supplies oil to the metering tank.

[0023] When the controller receives a signal that the oil level in the metering tank has reached the required level, it controls the second and sixth solenoid valves to close.

[0024] When the controller receives a signal that the vacuum level of the oil in the metering tank has reached the standard, the controller calculates the volume V1 of the oil in the metering tank based on the current liquid level.

[0025] The controller controls the opening of valve ports D and E of the first and third solenoid valves, and simultaneously controls the motor pump to start. The oil in the metering tank enters the inlet pipe and return pipe in sequence, forming a closed circulation oil circuit between the inlet pipe, return pipe and metering tank.

[0026] When the oil circulates in the circulating oil circuit and the controller receives a signal that the vacuum level of the oil in the metering tank meets the standard, the controller calculates the volume V2 of the oil in the metering tank based on the current liquid level. The controller obtains the oil volume V3 lost by the oil inlet pipe and the oil return pipe through V3=V1-V2.

[0027] The controller closes the first and third solenoid valves and stops the motor pump. After the hydraulic equipment is connected to the inlet and return oil pipes, the controller opens the valve ports D and E of the first and third solenoid valves and starts the motor pump, so that the oil in the metering tank circulates between the inlet oil pipe, the hydraulic equipment, the return oil pipe and the metering tank.

[0028] When the controller receives a signal that the vacuum level of the oil in the metering tank has reached the standard, the controller calculates the volume V4 of the oil in the metering tank based on the current liquid level, controls the motor pump to stop running, and obtains the volume V5 of the oil injected into the hydraulic equipment through V5=V1-V3-V4. The controller compares this volume with the oil injection volume of the hydraulic equipment stored in the controller. If the two are consistent, the oil injection process of the hydraulic equipment is completed.

[0029] Preferably, after completing the oil injection process for the hydraulic equipment, the process further includes:

[0030] Control the motor pump to stop running;

[0031] After the hydraulic equipment is disassembled, the valve port F of the third solenoid valve and the valve ports A and C of the second solenoid valve are opened so that the residual oil in the inlet pipe, return pipe and metering tank can return to the oil tank through the return pipe.

[0032] The vacuum oil injection system provided by this invention includes a metering tank, a level detector, a vacuum gauge, a first solenoid valve, a motor pump, a vacuum pump, and a controller. Specifically, the controller is signal-connected to the level detector, vacuum gauge, first solenoid valve, motor pump, and vacuum pump. The controller controls the operating status of the level detector, vacuum gauge, first solenoid valve, motor pump, and vacuum pump. The vacuum gauge detects the vacuum degree and pressure of the oil in the metering tank in real time and sends the real-time detection data to the controller. The vacuum pump is connected to the vacuum port of the metering tank. The controller controls the operation of the vacuum pump to extract the vacuum contained in the oil in the metering tank, thereby increasing the vacuum degree of the oil in the metering tank. The metering tank is equipped with a level detector for real-time detection of the liquid level height in the metering tank. The level detector sends the real-time detected liquid level signal in the metering tank to the controller. The controller calculates the volume of the oil in the metering tank, thereby calculating the amount of oil output from the metering tank to the hydraulic equipment, so as to realize quantitative oil injection into the hydraulic equipment, thereby increasing the oil injection speed and shortening the oil injection time.

[0033] The metering tank's outlet is connected to one end of the inlet pipe, and the other end of the inlet pipe has a first connector. The metering tank's return port is connected to one end of the return pipe, and the other end of the return pipe has a second connector that is detachably connected to the first connector. The outlet is equipped with a first solenoid valve, and the inlet pipe is equipped with a motor pump. The first and second connectors are connected to the hydraulic equipment, forming a closed loop between the metering tank, the inlet pipe, the hydraulic equipment, and the return pipe. The motor pump is started to draw the oil in the metering tank sequentially into the inlet pipe, the hydraulic equipment, and the return pipe, and then returns to the metering tank from the return port, forming a closed circulation oil circuit between the inlet pipe, the hydraulic equipment, the return pipe, and the metering tank. When the oil circulates in the circulation oil circuit and the vacuum gauge measures the required vacuum level, the controller calculates the volume of oil in the metering tank under the current state. The controller compares this volume with the pre-input volume of the hydraulic equipment. If they match, it proves that the hydraulic equipment is full of oil.

[0034] The vacuum oil injection system designed in the above manner, compared with the existing method of considering oil injection complete after eight hours of continuous circulation, can achieve quantitative oil injection of hydraulic equipment, can monitor the oil injection status in real time, and can also improve the vacuum degree of the oil injection process, greatly increasing the oil injection speed and shortening the oil injection time. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the vacuum oil injection system provided by the present invention;

[0037] Figure 2 This is a schematic diagram of the oil extraction process using the metering tank provided by the present invention;

[0038] Figure 3 This is a schematic diagram of the pipe loss correction process of the vacuum oil injection system provided by the present invention;

[0039] Figure 4 This is a schematic diagram of the process of injecting oil into hydraulic equipment using the vacuum oil injection system provided by the present invention;

[0040] Figure 5 This is a schematic diagram of the residual oil reinjection process of the vacuum oil injection system provided by the present invention;

[0041] Figure 6 This is a flowchart illustrating the steps of the oil injection method for the vacuum oil injection system provided by the present invention.

[0042] Figure label:

[0043] 01-Hydraulic equipment;

[0044] 1-Metering tank, 2-Level detector, 3-Vacuum gauge, 4-Inlet pipe, 5-First solenoid valve, 6-Return pipe, 7-Motor pump, 8-Air pump, 9-Controller, 10-Temperature sensor, 11-Oil tank, 12-Oil supply pipe, 13-Second solenoid valve, 14-Third solenoid valve, 15-Return pipe, 16-Level sensor, 17-Fourth solenoid valve, 18-Fifth solenoid valve, 19-Sixth solenoid valve. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] The core of this invention is to provide a vacuum oil injection system that, while achieving quantitative oil injection into the hydraulic device 01, reduces the difficulty of venting during the oil injection process, thereby greatly improving the oil injection efficiency of the hydraulic device 01. Another core aspect of this invention is to provide an oil injection method including the aforementioned vacuum oil injection system, which can achieve quantitative oil injection into the hydraulic device 01, while also reducing the difficulty of venting during the oil injection process and improving the oil injection efficiency of the hydraulic device 01.

[0048] Please refer to Figure 1 A vacuum oil injection system includes a metering tank 1, a liquid level detector 2, a vacuum gauge 3, an oil inlet pipe 4, a first solenoid valve 5, an oil return pipe 6, a motor pump 7, a vacuum pump 8, and a controller 9.

[0049] Specifically, the controller 9 is signal-connected to the level detector 2, vacuum gauge 3, first solenoid valve 5, motor pump 7, and vacuum pump 8. The controller 9 controls the operating status of the level detector 2, vacuum gauge 3, first solenoid valve 5, motor pump 7, and vacuum pump 8. The vacuum gauge 3 detects the vacuum degree and pressure of the oil in the metering tank 1 in real time and sends the real-time detection data to the controller 9. The vacuum pump 8 is connected to the air extraction port of the metering tank 1. The controller 9 controls the operation of the vacuum pump 8 to extract the vacuum contained in the oil in the metering tank 1 to improve the vacuum degree of the oil in the metering tank 1. The metering tank 1 is equipped with a level detector 2 for real-time detection of the liquid level in the metering tank 1. The level detector 2 sends the real-time detected liquid level signal in the metering tank 1 to the controller 9. The controller 9 calculates the volume of the oil in the metering tank 1, thereby calculating the amount of oil output from the metering tank 1 to the hydraulic equipment 01, so as to realize the quantitative oil injection of the hydraulic equipment 01, thereby improving the oil injection speed and shortening the oil injection time.

[0050] The oil outlet of metering tank 1 is connected to one end of oil inlet pipe 4, and the other end of oil inlet pipe 4 is equipped with a first connector. The oil return port of metering tank 1 is connected to one end of oil return pipe 6, and the other end of oil return pipe 6 is equipped with a second connector that is detachably connected to the first connector. The oil outlet is equipped with a first solenoid valve 5, and oil inlet pipe 4 is equipped with a motor pump 7. The first connector and the second connector are respectively connected to hydraulic equipment 01, so that a closed circuit is formed between metering tank 1, oil inlet pipe 4, hydraulic equipment 01 and oil return pipe 6. The motor pump 7 is started to control the oil in metering tank 1 to be sequentially pumped into oil inlet pipe. 4. The hydraulic equipment 01 and the return oil pipe 6 return from the return oil port of the metering tank 1 back into the metering tank 1, forming a closed circulation oil circuit between the oil inlet pipe 4, the hydraulic equipment 01, the return oil pipe 6 and the metering tank 1. When the oil circulates in the circulation oil circuit and the data measured by the vacuum gauge 3 reaches the required vacuum degree, the controller 9 calculates the volume of oil in the metering tank 1 under the current state. The controller 9 compares this volume with the oil filling volume of the hydraulic equipment 01 that has been pre-input to the controller 9. If the two are consistent, it proves that the hydraulic equipment 01 has been filled with oil.

[0051] The vacuum oil injection system designed in the above manner, compared with the existing method of considering oil injection complete after eight hours of continuous circulation, can achieve quantitative oil injection of hydraulic equipment 01, can monitor the oil injection status in real time, can improve the vacuum degree of the oil injection process, greatly improve the oil injection speed, and shorten the oil injection time.

[0052] In the above embodiment, the metering tank 1 is also provided with a temperature sensor 10 that is connected to the controller 9. The temperature sensor 10 is used to detect the temperature of the oil in the metering tank 1 in real time and send the measured temperature to the controller 9 in real time.

[0053] It should be noted that the temperature of the oil in the metering tank 1 is detected in real time by the temperature sensor 10, and the actual measured temperature is sent to the controller 9, which displays the temperature of the oil in the metering tank 1.

[0054] In the above case, the metering tank 1 includes a body and a heating element surrounding the body. The heating element extends along the height direction of the body. The heating element is signal connected to the controller 9. The heating element is provided with a heat insulation structure on its exterior.

[0055] It is understandable that the temperature sensor 10 detects the temperature of the oil in the metering tank 1 in real time and sends the actual measured temperature to the controller 9. When the actual measured temperature is lower than the required temperature, the controller 9 controls the heating element to heat the oil in the metering tank 1. When the actual measured temperature is not lower than the required temperature, the controller 9 controls the heating element to stop heating the oil in the metering tank 1. Through the cooperation of the temperature sensor 10, the heating element and the controller 9, constant temperature control of the oil can be achieved.

[0056] The heating element can be either an electric heating wire or a heating rod; there are no restrictions on which one is used, as long as the aforementioned technical effect can be achieved.

[0057] Furthermore, the main body has a cylindrical structure and is also equipped with a level gauge for measuring and displaying the oil level inside the body.

[0058] It should be noted that the body is set as a cylindrical structure to facilitate the calculation of the volume of oil inside the body. The calculation formula of the cylinder is pre-input into the controller 9, and the diameter of the body is also input. The controller 9 calculates the volume of oil in the metering tank 1 based on the liquid level height detected by the liquid level detector 2.

[0059] The main body is also equipped with a level gauge, which is used to physically measure the liquid level inside the main body and display it, allowing staff to directly observe the changes and data of the liquid level inside the main body.

[0060] In the above embodiment, an oil tank 11 is also included. The oil inlet of the oil tank 11 is connected to the oil supply device, and the oil outlet of the oil tank 11 is connected to the oil inlet of the metering tank 1 through the oil supply pipe 12.

[0061] It is understandable that oil is supplied to oil tank 11 through the oil supply device, and oil is supplied to metering tank 1 through oil tank 11. When the liquid level detector 2 detects that the liquid level in metering tank 1 has reached a low level, the controller 9 controls the valve port A and valve port B of the second solenoid valve 13 to open, so that the oil in oil tank 11 enters metering tank 1 through oil supply pipe 12. When the liquid level detector 2 detects that the liquid level in metering tank 1 has reached a high level, the controller 9 controls the valve port A and valve port B of the second solenoid valve 13 to close, so as to stop the oil supply from oil tank 11 to metering tank 1.

[0062] Based on the above embodiment, the top of the oil tank 11 is provided with an air extraction port, which is connected to the air extraction pump 8 through an air extraction pipe.

[0063] It should be noted that during the process of the oil supply device supplying oil to the oil tank 11 and the process of the oil tank 11 supplying oil to the metering tank 1, the vacuum pump 8 is controlled by the controller 9 to extract the vacuum in the oil tank 11 and the metering tank 1, so as to improve the vacuum degree during the oil filling process of the oil tank 11 and the metering tank 1.

[0064] In the above embodiment, a second solenoid valve 13 is provided on the oil supply pipe 12, and a third solenoid valve 14 is provided on the oil inlet pipe 4. Both the second solenoid valve 13 and the third solenoid valve 14 are two-position three-way solenoid valves. The valve port C of the second solenoid valve 13 is connected to the valve port F of the third solenoid valve 14 through the return pipe 15. Both the second solenoid valve 13 and the third solenoid valve 14 are signal connected to the controller 9.

[0065] Understandably, when oil tank 11 supplies oil to metering tank 1, controller 9 controls the second solenoid valve 13 to open valve port A and valve port B, thereby creating an oil passage between oil tank 11 and metering tank 1. Figure 2 As shown, the oil in tank 11 flows to metering tank 1 via supply pipe 12 in the direction of the arrow; when metering tank 1 supplies oil to hydraulic equipment 01, controller 9 controls the valve ports D and E of the third solenoid valve 14 to open, so that an oil passage is formed between metering tank 1 and hydraulic equipment 01, as shown. Figure 4 As shown, the oil in metering tank 1, driven by motor pump 7, flows through inlet pipe 4 in the direction of arrow to hydraulic equipment 01 until the oil in hydraulic equipment 01 overflows and flows back to metering tank 1 through return pipe 6. When hydraulic equipment 01 is disassembled, and it is necessary to collect the remaining oil in inlet pipe 4, return pipe 6, and metering tank 1 into oil tank 11, controller 9 controls the valve port F of the third solenoid valve 14 to open, and simultaneously controls the valve port B of the second solenoid valve 13 to close, causing the valve port C of the second solenoid valve 13 to open, so that the oil in inlet pipe 4, return pipe 6, and metering tank 1 flows back to oil tank 11 through the third solenoid valve 14 and return pipe 15. Figure 5 As shown.

[0066] In a preferred embodiment, the oil tank 11 is equipped with a liquid level sensor 16 that is connected to the controller 9. The liquid level sensor 16 is used to detect the height of the oil in the oil tank 11 in real time and send the measured liquid level height to the controller 9 in real time.

[0067] It should be noted that the liquid level sensor 16 detects the liquid level in the oil tank 11 in real time and sends the measured liquid level to the controller 9. When the liquid level sensor 16 detects that the liquid level in the oil tank 11 has reached a low level, the controller 9 controls the sixth solenoid valve 19 to open so that the oil supply device can supply oil to the oil tank 11. When the liquid level sensor 16 detects that the liquid level in the oil tank 11 has reached a high level, the controller 9 controls the sixth solenoid valve 19 to close so as to stop the oil supply device from supplying oil to the oil tank 11.

[0068] In the above situation, a fourth solenoid valve 17 is provided on the air extraction pipe connecting the air pump 8 to the oil tank 11, a fifth solenoid valve 18 is provided on the air extraction pipe connecting the air pump 8 to the metering tank 1, and a sixth solenoid valve 19 is provided on the pipe connecting the oil tank 11 to the oil supply device. The fourth solenoid valve 17, the fifth solenoid valve 18 and the sixth solenoid valve 19 are all connected to the controller 9 by signal, and all of them are one-way solenoid valves. The fourth solenoid valve 17 is a normally open solenoid valve, and the first solenoid valve 5, the second solenoid valve 13, the third solenoid valve 14, the fifth solenoid valve 18 and the sixth solenoid valve 19 are all normally closed solenoid valves.

[0069] Understandably, when the oil supply device supplies oil to the oil tank 11, the controller 9 controls the fourth solenoid valve 17 to open, thereby removing the vacuum from the oil in the oil tank 11. When the oil tank 11 supplies oil to the metering tank 1, the controller 9 controls the fourth solenoid valve 17 to close, and simultaneously controls the fifth solenoid valve 18 to open, thereby removing the vacuum from the oil in the metering tank 1 to increase the vacuum level of the oil.

[0070] In this embodiment, the oil supply pipe 12, oil inlet pipe 4, oil return pipe 6, and return pipe 15 are all transparent pipes to facilitate observation of the state of the oil inside the pipes.

[0071] Please refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 An oil injection method, applied to the aforementioned vacuum oil injection system, the oil injection method comprising:

[0072] Step S1: Control the air pump 8 and the sixth solenoid valve 19 to open so that the oil supply device supplies oil to the oil tank 11;

[0073] Step S2: When the controller 9 receives the signal that the oil level in the oil tank 11 has reached the target, it controls the second solenoid valve 13 and the fifth solenoid valve 18 to open, and at the same time controls the fourth solenoid valve 17 to close, so that the oil tank 11 supplies oil to the metering tank 1.

[0074] Step S3: When the controller 9 receives the signal that the oil level in the metering tank 1 has reached the target, it controls the second solenoid valve 13 and the sixth solenoid valve 19 to close.

[0075] Step S4: When the controller 9 receives the signal that the vacuum level of the oil in the metering tank 1 has reached the standard, the controller 9 calculates the volume V1 of the oil in the metering tank 1 based on the current liquid level.

[0076] Step S5: The controller 9 controls the valve ports D and E of the first solenoid valve 5 and the third solenoid valve 14 to open, and at the same time controls the motor pump 7 to start. The oil in the metering tank 1 enters the oil inlet pipe 4 and the oil return pipe 6 in sequence, so that the oil inlet pipe 4, the oil return pipe 6 and the metering tank 1 form a closed circulation oil circuit.

[0077] Step S6: When the oil is circulating in the circulating oil circuit and the controller 9 receives the signal that the vacuum degree of the oil in the metering tank 1 meets the standard, the controller 9 calculates the volume V2 of the oil in the metering tank 1 according to the current liquid level. The controller 9 obtains the volume V3 of the oil lost by the oil inlet pipe 4 and the oil return pipe 6 through V3=V1-V2.

[0078] Step S7: Controller 9 controls the first solenoid valve 5 and the third solenoid valve 14 to close, and at the same time controls the motor pump 7 to stop running. After the hydraulic equipment 01 is connected to the oil inlet pipe 4 and the oil return pipe 6, controller 9 controls the valve ports D and E of the first solenoid valve 5 and the third solenoid valve 14 to open again, and at the same time controls the motor pump 7 to start, so that the oil in the metering tank 1 circulates between the oil inlet pipe 4, the hydraulic equipment 01, the oil return pipe 6 and the metering tank 1.

[0079] Step S8: When the controller 9 receives the signal that the vacuum degree of the oil in the metering tank 1 has reached the standard, the controller 9 calculates the volume V4 of the oil in the metering tank 1 according to the current liquid level, controls the motor pump 7 to stop running, and the controller 9 obtains the volume V5 of the oil injected into the hydraulic device 01 through V5=V1-V3-V4, and compares it with the oil injection volume of the hydraulic device 01 stored in the controller 9. If the two are consistent, the oil injection process of the hydraulic device 01 is completed.

[0080] It should be noted that before use, the sixth solenoid valve 19 is opened to inject oil into the oil tank 11 through the oil supply device to ensure sufficient oil volume. After injection, the sixth solenoid valve 19 is closed. Under normal circumstances, the fourth solenoid valve 17 is always open, and the vacuum pump 8 continuously pumps air to reduce the vacuum level of the oil in the oil tank 11. During use, when the level sensor 16 detects that the oil level in the oil tank 11 has reached the high level, the oil injection into the oil tank 11 is completed. At this time, the sixth solenoid valve 19 does not need to be closed. The controller 9 directly controls the valve ports A and B of the second solenoid valve 13 to open, while simultaneously controlling the fourth solenoid valve 17 to close and the fifth solenoid valve 18 to open. The vacuum pump 8 creates a pressure difference to force the oil in the oil tank 11 into the metering tank 1. When the level detector 2 detects that the oil in the metering tank 1 has reached a high level, the oil filling of the metering tank 1 is completed. After the oil tank 11 has finished filling the metering tank 1, the valve ports A and B of the sixth solenoid valve 19 and the second solenoid valve 13 are closed, but the fifth solenoid valve 18 is not closed, so that the vacuum pump 8 continues to draw a vacuum, reducing the air content in the oil to be injected into the hydraulic equipment 01. The vacuum degree of the oil in the metering tank 1 is detected in real time by the vacuum gauge 3 of the metering tank 1, and the measured result is sent to the controller 9 in real time. The result is displayed in real time on the display screen of the controller 9 so as to observe the change in the vacuum degree of the oil in the metering tank 1. When the air pressure in the metering tank 1 is less than the atmospheric pressure, the purging is considered to be over. The vacuum gauge 3 can also be used to detect the air pressure. At this time, the controller 9 records the height of the hydraulic oil in the metering tank 1 and calculates the volume of the hydraulic oil V1. It controls the valve ports D and E of the first solenoid valve 5 and the third solenoid valve 14 to open, and at the same time controls the motor pump 7 to run. The cycle continues for a period of time until a circulating oil circuit is formed between the oil inlet pipe 4, the oil return pipe 6 and the metering tank 1, and the circulating oil circuit is filled with hydraulic oil and there are no air bubbles. That is, when the oil is circulating in the circulating oil circuit and the controller 9 receives the signal that the vacuum degree of the oil in the metering tank 1 has reached the standard, the height of the hydraulic oil in the metering tank 1 is recorded again, and the controller 9 calculates the oil volume V2 of the current liquid level. The difference between the two is the pipe loss, which is recorded as V3. That is, the controller 9 obtains the oil volume V3 lost by the oil inlet pipe 4 and the oil return pipe 6 through V3=V1-V2.

[0081] Furthermore, the valve ports D and E of the first solenoid valve 5 and the third solenoid valve 14 are closed, and the motor pump 7 is stopped. The hydraulic equipment 01 to be injected with oil is connected to the circulation oil circuit. The oil inlet at the bottom of the hydraulic equipment 01 is connected to the first connector of the oil inlet pipe 4, and the oil outlet at the top of the hydraulic equipment 01 is connected to the second connector of the return oil pipe 6, so that a closed circulation loop is formed between the metering tank 1, the oil inlet pipe 4, the hydraulic equipment 01, and the return oil pipe 6. Then, the valve ports D and E of the first solenoid valve 5 and the third solenoid valve 14 are opened, and the motor pump 7 is turned on to start injecting oil into the hydraulic equipment 01. When the hydraulic equipment 01 is full, the return oil pipe 6 begins to fill with hydraulic oil, forming a circulation oil circuit. At this time, the hydraulic oil falls from the return oil port at the top of the metering tank 1. At the same time, the air pump 8 continuously removes the air from the metering tank 1, achieving a better venting effect.

[0082] When the controller 9 receives a signal that the vacuum level of the oil in the metering tank 1 has reached the standard, it records the height of the hydraulic oil in the metering tank 1 again. The controller 9 calculates the oil volume V4 at the current liquid level and controls the motor pump 7 to stop running. The controller 9 obtains the oil volume V5 injected into the hydraulic device 01 through V5 = V1 - V3 - V4, which is the internal cavity volume V5 of the hydraulic device 01. When injecting oil into the hydraulic device 01 of the same specification, V5 is measured according to the above process and compared with the oil injection volume of the hydraulic device 01 stored in the controller 9. If the two are consistent, the oil injection process of the hydraulic device 01 is completed and the oil injection is considered to be finished.

[0083] In the above embodiments, after completing the oil filling process of the hydraulic equipment 01, the process further includes:

[0084] Control pump 7 to stop running;

[0085] After the hydraulic equipment 01 is disassembled, the valve port F of the third solenoid valve 14 and the valve ports A and C of the second solenoid valve 13 are opened so that the residual oil in the oil inlet pipe 4, the oil return pipe 6 and the metering tank 1 returns to the oil tank 11 through the return pipe 15.

[0086] Understandably, the final step involves stopping the motor pump 7, disassembling the first and second connectors, removing the hydraulic equipment 01, and pumping the remaining hydraulic oil back into the oil tank 11. The valve port F of the third solenoid valve 14 and the valve ports A and C of the second solenoid valve 13 are then opened. Simultaneously, the motor pump 7 is turned on. Once a pressure difference is established, the first and second connectors are opened. The remaining oil is then forced back into the oil tank 11 by relying on the pressure difference between the air pump 8 and the motor pump 7. After completion, all solenoid valves are closed.

[0087] To improve control efficiency, controller 9 is used to implement the above process, which is divided into five modes: oil intake from oil tank 11, oil intake from metering tank 1, pipe loss correction, oil injection into hydraulic equipment 01, and residual oil return to the tank. The process is completely consistent with the above. All solenoid valves in the system can be remotely controlled by controller 9 to achieve automated control of the opening direction of the solenoid valves, while displaying process parameters such as oil injection temperature and vacuum degree.

[0088] In summary, the vacuum oil injection system provided by this invention, before connecting to the hydraulic equipment 01, first detects the initial height of the oil in the metering tank 1 through the level detector 2 and transmits the data to the controller 9. The controller 9 calculates and stores the volume of the oil in the metering tank 1 in the initial state. Then, the first connector is connected to the second connector, and the controller 9 controls the first solenoid valve 5 to open. At the same time, it controls the motor pump 7 and the vacuum pump 8 to run, drawing the oil in the metering tank 1 sequentially into the inlet pipe 4 and the return pipe 6, and returning it to the metering tank 1 from the return port, forming a closed circulation oil circuit between the inlet pipe 4, the return pipe 6, and the metering tank 1. Simultaneously, the vacuum in the oil in the metering tank 1 is extracted through the vacuum pump 8 and the vacuum pipe to increase the vacuum degree of oil injection. The metering tank 1 is also equipped with a vacuum gauge 3 for real-time detection of the vacuum degree and pressure of the oil in the metering tank 1. The vacuum gauge 3 sends the real-time detected vacuum degree and pressure of the oil in the metering tank 1 to the controller 9. When the oil is circulating... When the oil circulation in the loop is complete and the vacuum gauge 3 measures the required vacuum level, the controller 9 calculates and stores the volume of oil in the metering tank 1 under the current state. This allows the controller to calculate the volume of oil in the inlet pipe 4 and the return pipe 6. Then, the controller shuts off the motor pump 7, disconnects the first and second connectors, connects the hydraulic device 01, and then starts the motor pump 7. The oil in the metering tank 1 is sequentially pumped into the inlet pipe 4, the hydraulic device 01, and the return pipe 6, returning to the metering tank 1 through the return port. This creates a closed loop between the inlet pipe 4, the hydraulic device 01, the return pipe 6, and the metering tank 1. When the oil circulates in the loop and the vacuum gauge 3 measures the required vacuum level, the controller 9 calculates and stores the volume of oil in the metering tank 1 under the current state. This allows the controller to calculate the volume of oil in the hydraulic device 01. This volume matches the volume of the inner cavity of the hydraulic device 01, indicating that the hydraulic device 01 is full of oil.

[0089] This system enables quantitative oil injection into the hydraulic device, further enhancing the vacuum level during injection, significantly increasing injection speed, and shortening injection time. It utilizes air pressure difference and the motor pump 7 to recover residual oil, solving the problem of difficult residual oil recovery. By adding a metering tank 1 and disconnecting the oil path between it and the oil tank 11, the system reduces the difficulty of emptying the hydraulic oil while simultaneously controlling its volume, increasing the emptying speed, and facilitating observation, thus greatly improving the oil injection efficiency of the hydraulic equipment 01. Furthermore, the system's ease of observation makes it easier to identify problems during the injection process, which will contribute to future improvements to the hydraulic equipment 01.

[0090] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0091] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0092] The present invention provides a detailed description of a vacuum oil injection system and method. Specific examples have been used to illustrate the principles and implementation methods of the invention. These embodiments are merely illustrative and are intended to aid in understanding the method and core concepts of the invention. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims.

Claims

1. A vacuum oil injection system, characterized in that, include: Metering tank (1), the metering tank (1) is equipped with a liquid level detector (2) for real-time detection of the liquid level in the metering tank (1), the metering tank (1) is also equipped with a vacuum gauge (3) for real-time detection of the vacuum degree of the oil in the metering tank (1), the oil outlet of the metering tank (1) is connected to one end of the oil inlet pipe (4), and the oil outlet is equipped with a first solenoid valve (5), the other end of the oil inlet pipe (4) is equipped with a first connector, the oil return port of the metering tank (1) is connected to one end of the oil return pipe (6), the other end of the oil return pipe (6) is equipped with a second connector that is detachably connected to the first connector, and the oil inlet pipe (4) is equipped with a motor pump (7). An air pump (8) is connected to the air extraction port of the metering tank (1); The controller (9) is signal connected to the liquid level detector (2), the vacuum gauge (3), the first solenoid valve (5), the motor pump (7), and the air pump (8).

2. The vacuum oil injection system according to claim 1, characterized in that, The metering tank (1) is also equipped with a temperature sensor (10) that is connected to the controller (9) in real time. The temperature sensor (10) is used to detect the temperature of the oil in the metering tank (1) in real time and send the measured temperature to the controller (9) in real time.

3. The vacuum oil injection system according to claim 2, characterized in that, The metering tank (1) includes a body and a heating element surrounding the body. The heating element extends along the height of the body and is signal-connected to the controller (9). The heating element is provided with a heat insulation structure on its exterior.

4. The vacuum oil injection system according to claim 3, characterized in that, The body is a cylindrical structure, and the body is also equipped with a level gauge for measuring and displaying the oil level inside the body.

5. The vacuum oil injection system according to claim 4, characterized in that, It also includes an oil tank (11), the oil inlet of which is connected to an oil supply device, and the oil outlet of which is connected to the oil inlet of the metering tank (1) via an oil supply pipe (12).

6. The vacuum oil injection system according to claim 5, characterized in that, The top of the oil tank (11) is provided with an air extraction port, which is connected to the air extraction pump (8) through an air extraction pipe.

7. The vacuum oil injection system according to claim 6, characterized in that, The oil supply pipe (12) is provided with a second solenoid valve (13), and the oil inlet pipe (4) is provided with a third solenoid valve (14). The second solenoid valve (13) and the third solenoid valve (14) are both two-position three-way solenoid valves. The valve port C of the second solenoid valve (13) is connected to the valve port F of the third solenoid valve (14) through the return pipe (15). The second solenoid valve (13) and the third solenoid valve (14) are both signal connected to the controller (9).

8. The vacuum oil injection system according to claim 7, characterized in that, The oil tank (11) is equipped with a liquid level sensor (16) that is connected to the controller (9) in signal. The liquid level sensor (16) is used to detect the height of the oil in the oil tank (11) in real time and send the measured liquid level height to the controller (9) in real time.

9. The vacuum oil injection system according to claim 8, characterized in that, A fourth solenoid valve (17) is provided on the air extraction pipe connecting the air pump (8) to the oil tank (11). A fifth solenoid valve (18) is provided on the air extraction pipe connecting the air pump (8) to the metering tank (1). A sixth solenoid valve (19) is provided on the pipeline connecting the oil tank (11) to the oil supply device. The fourth solenoid valve (17), the fifth solenoid valve (18), and the sixth solenoid valve (19) are all signal-connected to the controller (9) and are all one-way solenoid valves. The fourth solenoid valve (17) is a normally open solenoid valve. The first solenoid valve (5), the second solenoid valve (13), the third solenoid valve (14), the fifth solenoid valve (18), and the sixth solenoid valve (19) are all normally closed solenoid valves.

10. An oil injection method, characterized in that, The oil injection method, applied to the vacuum oil injection system of claim 9, comprises: Control the air pump (8) and the sixth solenoid valve (19) to open so that the oil supply device supplies oil to the oil tank (11); When the controller (9) receives the signal that the oil level in the oil tank (11) is in place, it controls the second solenoid valve (13) and the fifth solenoid valve (18) to open, and at the same time controls the fourth solenoid valve (17) to close, so that the oil tank (11) supplies oil to the metering tank (1); When the controller (9) receives a signal that the oil level in the metering tank (1) has reached the required level, it controls the second solenoid valve (13) and the sixth solenoid valve (19) to close. When the controller (9) receives a signal that the vacuum level of the oil in the metering tank (1) meets the standard, the controller (9) calculates the volume V1 of the oil in the metering tank (1) based on the current liquid level. The controller (9) controls the valve ports D and E of the first solenoid valve (5) and the third solenoid valve (14) to open, and at the same time controls the motor pump (7) to start. The oil in the metering tank (1) enters the oil inlet pipe (4) and the oil return pipe (6) in sequence, so that a closed circulation oil circuit is formed between the oil inlet pipe (4), the oil return pipe (6) and the metering tank (1). When the oil circulates in the circulating oil circuit and the controller (9) receives a signal that the vacuum degree of the oil in the metering tank (1) meets the standard, the controller (9) calculates the volume V2 of the oil in the metering tank (1) according to the current liquid level. The controller (9) obtains the volume V3 of the oil lost by the oil inlet pipe (4) and the oil return pipe (6) through V3=V1-V2. The controller (9) controls the first solenoid valve (5) and the third solenoid valve (14) to close, and at the same time controls the motor pump (7) to stop running. After the hydraulic equipment (01) is connected to the oil inlet pipe (4) and the oil return pipe (6), the controller controls the valve ports D and E of the first solenoid valve (5) and the third solenoid valve (14) to open again, and at the same time controls the motor pump (7) to start, so that the oil in the metering tank (1) forms a circulation between the oil inlet pipe (4), the hydraulic equipment (01), the oil return pipe (6) and the metering tank (1). When the controller (9) receives a signal that the vacuum level of the oil in the metering tank (1) has reached the standard, the controller (9) calculates the volume V4 of the oil in the metering tank (1) according to the current liquid level height, controls the motor pump (7) to stop running, and the controller (9) obtains the volume V5 of the oil injected into the hydraulic device (01) through V5=V1-V3-V4, and compares it with the oil injection volume of the hydraulic device (01) stored in the controller (9). If the two are consistent, the oil injection process of the hydraulic device (01) is completed.

11. The oil injection method according to claim 10, characterized in that, After the oil injection process of the hydraulic equipment (01) is completed, the process further includes: Control the motor pump (7) to stop running; After the hydraulic equipment (01) is disassembled, the valve port F of the third solenoid valve (14), the valve port A and the valve port C of the second solenoid valve (13) are opened so that the residual oil in the oil inlet pipe (4), the oil return pipe (6) and the metering tank (1) returns to the oil tank (11) through the return pipe.

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