Hydraulic oil dissolved air ultra-vacuum separation device and separation method thereof

Abstract

The invention discloses a hydraulic oil dissolved air ultra-vacuum separation device and a separation method thereof, and belongs to the technical field of hydraulic system oil purification. Comprising the steps that oil injection is conducted, an oil pump conveys crude oil from a negative-pressure crude oil tank into a separation oil cylinder, and by switching a first electromagnetic valve, oil inlet and oil discharge of a left cylinder and a right cylinder of the separation oil cylinder or oil inlet and oil discharge of the right cylinder and the left cylinder are achieved; after the separation oil cylinder is filled with the oil liquid, the first electromagnetic valve is closed, the oil charging and discharging pipeline is cut off, then the second electromagnetic valve is opened, and the air exhaust pipeline is communicated; measuring the gas content, injecting a small amount of separated hydraulic oil into the piston type oil gas content measurer, discharging the separated hydraulic oil to a negative pressure isolation oil tank, switching a first electromagnetic valve, switching on a third electromagnetic valve, and starting an oil pump; and after crude oil is injected into the right cylinder of the separation oil cylinder, oil in the left cylinder of the separation oil cylinder is discharged into the negative pressure isolation oil tank through the isolation piston ring. The method is simple to operate; discharge of extracted air can be achieved, and the air is prevented from flowing back into oil.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic system oil purification, and in particular relates to a hydraulic oil dissolved air ultra-vacuum separation device and a separation method thereof. Background Art

[0002] Since oil is produced and stored in the atmosphere, it will inevitably dissolve into the air. The dissolved air exists in the oil in an extremely tiny form that is invisible to the naked eye. Generally, 8% to 10% of dissolved air is dissolved in the oil. The adverse effects of dissolved air on oil are: first, it will reduce the bulk elastic modulus and rigidity of the oil, making the hydraulic system correspondingly worse; second, dissolved air will produce cavitation, aggravate the peeling and damage of the surface materials of high-speed rotating parts such as pump blades, and cause vibration and noise; third, in the closed hydraulic system of underwater buoyancy equipment, the dissolved air will cause uneven buoyancy and affect the diving work of the equipment. In the current production process, there is no equipment that can quickly and effectively separate the dissolved air in the oil, and there is no effective method to judge and identify the dissolved air. Therefore, the current production efficiency is low, and the oil quality is unstable, which further affects the use of the equipment.

[0003] In view of the above-mentioned prior art, the applicant has made a useful design, and the technical solution to be introduced below is produced in this context. Summary of the invention

[0004] The primary task of the present invention is to provide a hydraulic oil dissolved air ultra-vacuum separation device, which has good oil-gas separation effect, can be operated in batches and can realize oil-gas content monitoring.

[0005] Another task of the present invention is to provide a separation method of a hydraulic oil dissolved air ultra-vacuum separation device, which has simple operation steps and can ensure the full embodiment of the effect of the hydraulic oil dissolved air ultra-vacuum separation device.

[0006] In order to complete the primary task, the technical solution provided by the present invention is a hydraulic oil dissolved air ultra-vacuum separation device, including a separation cylinder, an excitation plate, a second pressure reducing valve, a second solenoid valve, an electric piston separator, a separator outward one-way valve, a separator negative pressure sensor, a measuring device negative pressure sensor, a piston type oil and gas content measuring device, a first ball valve, a second ball valve, a third solenoid valve, an oil pump, a negative pressure isolation oil tank, a negative pressure original oil tank, a first pressure reducing valve and a first solenoid valve. The separation cylinder is arranged on the excitation plate, including a left cylinder and a right cylinder isolated from each other. The left cylinder and the right cylinder respectively have oil circuit interfaces at the bottom and exhaust interfaces at the top. The first solenoid valve is a three-position four-way solenoid valve. The first oil port of the first solenoid valve is connected to the first oil port of the third solenoid valve, and the second oil port of the third solenoid valve is divided into two oil ports. , one of which is connected to the piston-type oil and gas content measuring device through a manual first ball valve, and the other is connected to the negative pressure isolation oil tank through a manual second ball valve, the third oil port of the third solenoid valve is connected to the negative pressure isolation oil tank, the second oil port of the first solenoid valve is connected to the oil circuit interface of the left cylinder of the separation cylinder, the fourth oil port of the first solenoid valve is connected to the oil circuit interface of the right cylinder of the separation cylinder, the third oil port of the first solenoid valve is connected to the first pressure reducing valve, the first pressure reducing valve is connected to the oil pump, the oil pump is connected to the negative pressure original oil tank, the exhaust interface of the left cylinder of the separation cylinder and the exhaust interface of the right cylinder are respectively connected to the first interface of the second pressure reducing valve through a pipeline provided with an outward one-way air valve, the second interface of the second pressure reducing valve is connected to the negative pressure isolation oil tank, the third interface of the second pressure reducing valve is connected to the first interface of the second solenoid valve, and the second interface of the second solenoid valve is connected to the electric piston separator.

[0007] In a specific embodiment of the present invention, the separation cylinder includes a left sealing end cover, an isolation piston ring, a tightening screw, a separation cylinder, a cylinder end cover sealing ring, a right sealing end cover, an oil circuit interface, a sensor fixing plate, a cylinder magnetic induction sensor, a guide ring, a cylinder magnetic ring, a piston sealing ring and a tightening stud. The left sealing end cover and the right sealing end cover are respectively arranged at the two ends of the separation cylinder. Cylinder end cover sealing rings are arranged between the separation cylinder and the left sealing end cover and the right sealing end cover. The left sealing end cover and the right sealing end cover are fastened by the cooperation of the tightening screw and the tightening stud. The left sealing end cover and the right sealing end cover are fastened together. The sealing end cover is respectively provided with an exhaust interface at the top and an oil circuit interface at the bottom. The isolation piston ring is arranged in the separation cylinder, and the isolation piston ring has three grooves distributed axially at intervals on the outer peripheral wall. The piston sealing ring, the cylinder magnetic ring and the guide ring are arranged in the three grooves from left to right in sequence. There are multiple cylinder magnetic induction sensors, and the multiple cylinder magnetic induction sensors are fixed on the outer wall of the separation cylinder through a sensor fixing plate and are evenly distributed along the axial direction of the separation cylinder. The cylinder magnetic ring cooperates with the cylinder magnetic induction sensor to realize the status display and position control of the isolation piston ring.

[0008] In another specific embodiment of the present invention, the excitation plate includes an excitation plate, a wire rope isolator, a high-speed vibration motor, a vibration transmission frame, a motor fixing frame and a cylinder fixing frame. The separation cylinder and the electric piston separator are arranged on the front of the excitation plate. The high-speed vibration motor is fixed in the middle of the back side of the excitation plate through the motor fixing frame. The vibration transmission frame is U-shaped, and the arc-shaped part is clamped on the high-speed vibration motor. The two ends are fixedly installed on the bottom of the excitation plate. The vibration transmission frame and the motor fixing frame cooperate to transmit the high-frequency vibration to the excitation plate. There is a pair of wire rope isolators, which are arranged at both ends of the length direction of the bottom of the excitation plate. There is a pair of cylinder fixing frames, one of which is fixedly installed on the left sealing end cover of the separation cylinder, and the other is fixedly connected to the right sealing end cover of the separation cylinder. The bottom of the pair of cylinder fixing frames forms an installation fold, which is fixed to the excitation plate through the installation fold.

[0009] In another specific embodiment of the present invention, the electric piston separator includes a piston shaft sealing ring, a cylinder end cover sealing ring, a cylinder magnetic ring, a screw locking nut, a bearing locking nut, a screw, a screw motor, an upper sealing end cover, a cylinder, a plane thrust bearing, a bearing gasket, a wear-resistant ring, a cylinder piston YCC sealing ring, a lower end cover gasket, a lower sealing end cover, a separator piston and a cylinder magnetic sensor. The upper sealing end cover and the lower sealing end cover are respectively arranged at the top and the bottom of the cylinder, and the lower sealing end cover is provided with a lower end cover sealing ring on the outer side surface cooperating with the cylinder. The lower sealing end cover is provided with a lower end cover gasket on the contact surface with the bottom of the cylinder. The screw motor is installed on the upper sealing end cover through the motor seat. The separator piston is located in the cylinder to separate the cylinder into an upper cylinder and a lower cylinder. The upper end of the screw is connected to the screw motor. The separator piston is formed with a bearing accommodating cavity at the upper end, and a screw accommodating cavity is formed at the bottom of the bearing accommodating cavity. The plane thrust bearing is arranged in the bearing accommodating cavity. The bottom of the plane thrust bearing is padded with a bearing gasket. The bearing locking nut is threadedly connected to the outer wall of the bearing accommodating cavity to lock the plane thrust bearing. The thrust bearing is fixed, the lower end of the screw rod passes through the bearing locking nut and the plane thrust bearing and then extends into the screw rod accommodating chamber, the screw rod locking nut is threadedly connected to the lower end of the screw rod, the cylinder piston YCC sealing ring and the cylinder magnetic ring are sleeved on the piston at intervals, there is a pair of cylinder piston YCC sealing rings, the cylinder magnetic ring is located between the pair of cylinder piston YCC sealing rings, when the cylinder magnetic ring is equipped with a magnetic sensor, it is used to control the displacement of the separator piston, the wear-resistant ring is arranged outside the cylinder magnetic ring, and the lower sealing end cover is formed with a pipeline and the The second solenoid valve is connected to the intake channel, and two air pipes are extended to the left and right sides respectively, one of which is used for exhaust and is provided with a separator outward one-way valve, and the other air pipe is used as a pressure measuring port, which is connected to the separator negative pressure sensor through an inward one-way valve for measuring the pressure in the cylinder. The separator piston forms a piston shaft at the bottom, and the piston shaft is matched with the upper port of the intake channel of the lower sealing end cover. The piston shaft is provided with the piston shaft sealing ring, and a plurality of cylinder magnetic sensors are arranged at intervals along the height direction of the outer edge of the cylinder.

[0010] In another specific embodiment of the present invention, the piston-type oil and gas content meter includes an end cover transition plate, an oil-containing sleeve, a bottom sealing end cover, a meter cylinder, a meter magnetic ring, a meter piston YCC sealing ring, a top cover sealing ring, a top sealing end cover, a sealing buffer pad, a meter piston, a piston pull rod, a pull wire sensor fixing frame, a pull wire sensor, a connecting rod and a Y-type joint. The top sealing end cover and the bottom sealing end cover are respectively arranged at the top and bottom of the meter cylinder, and the top sealing end cover extends the meter oil pipe to the left and right sides respectively, one of which is connected to the third solenoid valve and the first ball valve through a pipeline, and the other meter oil pipe is connected to the meter negative pressure sensor, the top cover sealing ring is arranged on the contact surface between the top sealing end cover and the top of the meter cylinder, the bottom sealing end cover is supported on the end cover transition plate and passes through the end cover transition plate, and the meter piston is arranged In the measuring cylinder, there is a pair of YCC sealing rings of the measuring piston, which are sleeved on the measuring piston with intervals up and down. The measuring magnetic ring is sleeved on the measuring piston and located between a pair of top cover sealing rings. The piston pull rod is located below the measuring piston and the top end is fixedly connected to the measuring piston by a screw. The top sealing end cover is provided with the sealing buffer pad on the inner wall facing the screw. The bottom end of the piston pull rod extends downward through the oil-containing sleeve in the bottom sealing end cover and is connected to the Y-type joint. A gravity block is connected to the Y-type joint. The wire pull sensor fixing frame is fixedly connected to the end cover transition plate. The wire pull sensor is fixed on the wire pull sensor fixing frame. The bottom end of the piston pull rod is also connected to one end of the connecting rod. The other end of the connecting rod is connected to the wire pull head of the wire pull sensor. The wire pull sensor is used to collect the displacement data of the measuring piston.

[0011] In another specific embodiment of the present invention, it also includes a device fixing plate, and the separation cylinder, the excitation plate, the second pressure reducing valve, the second solenoid valve, the electric piston separator, the separator outward one-way valve, the separator negative pressure sensor, the measuring device negative pressure sensor, the piston-type oil and gas content measuring device, the first ball valve, the second ball valve, the third solenoid valve, the oil pump, the first pressure reducing valve and the first solenoid valve are arranged on the device fixing plate, and the wire rope vibration isolator is used to reduce the vibration transmitted to the device fixing plate.

[0012] To accomplish another task, the technical solution provided by the present invention is a separation method of a hydraulic oil dissolved air ultra-vacuum separation device, comprising the following steps: S1) Oil filling: the oil pump delivers crude oil from the negative pressure crude oil tank to the separation cylinder, and by switching the first solenoid valve, the separation cylinder is filled with oil from the left cylinder and discharged from the right cylinder, or filled with oil from the right cylinder and discharged from the left cylinder; S2) Vacuum separation and air extraction. When the oil fills the separation cylinder, close the first solenoid valve, cut off the oil charging and discharging pipeline, open the second solenoid valve, connect the air extraction pipeline, and the screw motor drives the separator piston to move upward. When the separation pressure is reached, the dissolved air in the oil is extracted. Then close the second solenoid valve, and the screw motor drives the separator piston in the reverse direction to discharge the extracted air from the cylinder. The separator piston moves up and down N times until the standard requirements are met; S3) measuring the gas content, injecting a small amount of separated hydraulic oil into the piston type oil gas content measuring device, recording the displacement of the wire displacement sensor at this moment, and then releasing the gravity block until the value of the negative pressure sensor of the measuring device reaches the set pressure value for the first time, reading the displacement of the wire displacement sensor, and obtaining the oil gas content; S4) Drain the oil to the negative pressure isolation tank, switch the first solenoid valve, connect the third solenoid valve, start the oil pump, and if the left cylinder of the separation cylinder is full of oil, inject the crude oil into the right cylinder of the separation cylinder and then discharge the oil in the left cylinder of the separation cylinder into the negative pressure isolation tank through the isolation piston ring.

[0013] Due to the adoption of the above structure, the present invention has the following beneficial effects compared with the prior art: firstly, batch operation can be realized by switching the separation cylinder left and right; secondly, the exhaust of the extracted air can be realized through the cooperation of the electric piston separator, the solenoid valve and the one-way valve, thereby preventing the air from flowing back into the oil; thirdly, by installing the separation cylinder on the excitation plate, on the one hand, the agitation of the oil is accelerated to increase the release of air from the oil, and on the other hand, the friction of the oil molecules is accelerated to prevent the air from dissolving back into the oil quickly after the oil contacts the air; fourthly, the online monitoring function of the oil and gas content is added, integrating operation and detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the principle diagram of the present invention; Figure 2 It is a structural schematic diagram of the present invention; Figure 3 This is a principle block diagram of the state of the left cylinder filling with oil and the right cylinder draining oil according to the present invention; Figure 4 It is a block diagram of the state and detection principle of the right cylinder filling oil and the left cylinder draining oil according to the present invention; Figure 5 It is a structural schematic diagram of the separation oil cylinder of the present invention; Figure 6 It is a structural schematic diagram of the excitation plate of the present invention; Figure 7 is a cross-sectional view of the electric piston separator of the present invention; Figure 8 It is a cross-sectional view of the piston type oil and gas content measuring device described in the present invention.

[0015] In the figure: 1. Separation cylinder, 101. Left sealing end cover, 102. Isolation piston ring, 1021. Groove, 103. Tension screw, 104. Separation cylinder, 105. Cylinder end cover sealing ring, 106. Right sealing end cover, 107. Oil circuit interface, 108. Sensor fixing plate, 109. Cylinder magnetic induction sensor, 110. Guide ring, 111. Cylinder magnetic ring, 112. Piston sealing ring, 113. Tension stud, 114 exhaust interface; 2. Excitation plate, 201. Excitation plate, 202. Wire rope vibration isolator, 203. High-speed vibration motor, 2 04. Vibration transmission frame, 205. Motor fixing frame, 206. Cylinder fixing frame, 2061. Installation folding edge; 3. Second pressure reducing valve; 4. Second solenoid valve; 5. Electric piston separator, 501. Piston shaft sealing ring, 502. Cylinder end cover sealing ring, 503. Cylinder magnetic ring, 504. Screw locking nut, 505. Bearing locking nut, 506. Screw, 507. Screw motor, 508. Upper sealing end cover, 509. Cylinder, 510. Plane thrust bearing, 511. Bearing gasket, 512. Wear-resistant ring, 513. Cylinder piston YC C sealing ring, 514. Lower end cover gasket, 515. Lower sealing end cover, 5151. Cylinder air intake channel, 5152. Air pipe, 516. Separator piston, 5161. Bearing accommodating chamber, 5162. Screw accommodating chamber, 5163. Piston shaft, 517. Cylinder magnetic sensor; 6. Outward one-way valve; 7. Separator negative pressure sensor; 8. Measuring device negative pressure sensor; 9. Piston oil and gas content measuring device, 901. End cover transition plate, 902. Oil-containing shaft sleeve, 903. Bottom sealing end cover, 904. Measuring device cylinder, 905. Measuring device magnetic ring, 90 6. Measuring device piston YCC sealing ring, 907. Top cover sealing ring, 908. Top sealing end cover, 9081. Measuring device oil pipe, 909. Sealing buffer pad, 910. Measuring device piston, 911. Piston pull rod, 912. Pull wire sensor fixing bracket, 913. Pull wire sensor, 914. Connecting rod, 915. Y-type connector; 10. First ball valve; 11. Second ball valve; 12. Third solenoid valve; 13. Oil pump; 14. Negative pressure isolation oil tank; 15. Negative pressure crude oil tank; 16. First pressure reducing valve; 17. First solenoid valve; 18. Device fixing plate. DETAILED DESCRIPTION

[0016] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but the description of the embodiments is not a limitation of the technical solution. Any changes in form rather than substance based on the concept of the present invention should be regarded as the protection scope of the present invention.

[0017] In the following description, all concepts related to directionality (or orientation) such as up, down, left, right, front and back are referring to the position state of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be understood as special limitations on the technical solution provided by the present invention.

[0018] The present invention relates to a hydraulic oil dissolved air ultra-vacuum separation device, which utilizes piston movement to form ultra-vacuum suction to achieve a hydraulic oil dissolved air separation pressure of 100-6700 Pa, thereby separating the dissolved air from the hydraulic oil, and then utilizing various valves to isolate the dissolved air from the hydraulic oil. The present invention is mainly used to process hydraulic oil to separate the dissolved air therein, to prevent the precipitation of dissolved air during subsequent use and cause instability of the hydraulic system. The present invention shares commonality with common hydraulic oil processing devices in terms of overall functional objectives, both of which are intended to purify hydraulic oil.

[0019] See Figure 1 and Figure 2 The present invention includes a hydraulic oil dissolved air ultra-vacuum separation device, including a device fixing plate 18 and a separation cylinder 1, an excitation plate 2, a second pressure reducing valve 3, a second solenoid valve 4, an electric piston separator 5, a separator outward one-way valve 6, a separator negative pressure sensor 7, a measuring device negative pressure sensor 8, a piston-type oil and gas content measuring device 9, a first ball valve 10, a second ball valve 11, a third solenoid valve 12, an oil pump 13, a first pressure reducing valve 16 and a first solenoid valve 17, and also includes a negative pressure isolation oil tank 14 and a negative pressure original oil tank 15.

[0020] The separation oil cylinder 1 is arranged on the excitation plate 2, and includes a left cylinder and a right cylinder isolated from each other. The left cylinder and the right cylinder have an oil circuit interface 107 at the bottom and an exhaust interface 114 at the top. The first solenoid valve 17 is a three-position four-way solenoid valve, the second solenoid valve 4 is a two-position two-way solenoid valve, the third solenoid valve 12 is a two-position three-way solenoid valve, and the first pressure reducing valve 16 and the second pressure reducing valve 3 are one-in-one-out valves. The first oil port of the first solenoid valve 17 is connected to the first oil port of the third solenoid valve 11, and the second oil port of the third solenoid valve 11 is divided into two paths, one of which is connected to the piston-type oil and gas content measuring device 9 through the first ball valve 10, and the other is connected to the negative pressure isolation oil tank 14 through the second ball valve 11. The third oil port of the third solenoid valve 12 is connected to the negative pressure isolation oil tank 14, the second oil port of the first solenoid valve 17 is connected to the oil circuit interface 107 of the left cylinder of the separation oil cylinder 1, the fourth oil port of the first solenoid valve 17 is connected to the oil circuit interface 107 of the right cylinder of the separation oil cylinder 1, and the first oil port of the first solenoid valve 17 is connected to the oil circuit interface 107 of the right cylinder of the separation oil cylinder 1. The three oil ports are connected to the first pressure reducing valve 16, the first pressure reducing valve 16 is connected to the oil pump 13, the oil pump 13 is connected to the negative pressure crude oil tank 15, the exhaust interface 114 of the left cylinder of the separation oil cylinder 1 and the exhaust interface 114 of the right cylinder are connected to the three-way connection through the sleeve and then connected to the first interface of the second pressure reducing valve 3 through the outward one-way air valve, the second interface of the second pressure reducing valve 3 is connected to the negative pressure isolation oil tank 14, the third interface of the second pressure reducing valve 3 is connected to the first interface of the second solenoid valve 4, and the second interface of the second solenoid valve 4 is connected to the electric piston separator 5. The second solenoid valve 4 is opened when pumping air and closed when exhausting air.

[0021] In this embodiment, a first pressure reducing valve 15 is installed at the rear end of the oil pump 13, and the pressure is set to 1.5Mpa, which is used to control the pressure of the input oil to prevent damage to the separation cylinder 1. A second pressure reducing valve 3 is set between the separation cylinder 1 and the electric piston separator 5, and the pressure is set to 1Mpa, which is used to expel the trapped air in the separation cylinder 1 when the separation cylinder 1 is filled with oil. The hydraulic oil in the negative pressure original oil tank 15 can be pumped into the separation cylinder 1 by the oil pump 13. The first solenoid valve 17 is equivalent to a reversing valve, which is controlled by the control system and is used to change the direction of the oil circuit and inject it into the left cylinder or the right cylinder of the separation cylinder 1. The separation cylinder 1 can be as follows Figure 3 The left cylinder is shown as oil inlet and the right cylinder is shown as oil outlet. Figure 4The right cylinder shown in the figure enters oil and the left cylinder exits oil. Taking the left cylinder of the separation oil cylinder 1 as an example, the specific oil path is that the hydraulic oil in the negative pressure original oil tank 15 enters the first pressure reducing valve 16 via the oil pump 13, and then from the first pressure reducing valve 16 to the first solenoid valve 17. The second oil port of the first solenoid valve 17 sends the hydraulic oil to the left cylinder of the separation oil cylinder 1, and the oil outlet of the right cylinder of the separation oil cylinder 1 is sent to the fourth oil port of the first solenoid valve 17. The first solenoid valve 17 sends the separated hydraulic oil to the third solenoid valve 12 through the first oil port. Then, the following three paths will appear: First, the hydraulic oil enters the negative pressure isolation oil tank 14 from the third solenoid valve 12; second, the hydraulic oil enters the negative pressure isolation oil tank 14 from the third solenoid valve 12 via the second ball valve 11; third, the hydraulic oil enters the piston oil and gas content meter 9 from the third solenoid valve 12 via the first ball valve 10.

[0022] See Figure 5The separation oil cylinder 1 comprises a left sealing end cover 101, an isolating piston ring 102, a tightening screw 103, a separation cylinder 104, a cylinder end cover sealing ring 105, a right sealing end cover 106, an oil circuit interface 107, a sensor fixing plate 108, a cylinder magnetic induction sensor 109, a guide ring 110, a cylinder magnetic ring 111, a piston sealing ring 112 and a tightening stud 113. The left sealing end cover 101 and the right sealing end cover 106 are respectively arranged at both ends of the separation cylinder 104, and a cylinder end cover sealing ring 105 is arranged between the separation cylinder 104 and the left sealing end cover 101 and the right sealing end cover 106, and the left sealing end cover 101 and the right sealing end cover 106 are fastened by the cooperation of the tightening screw 103 and the tightening stud 113. The cylinder end cover seal ring 105 at the left sealing end cover 101 and the right sealing end cover 106 uses two O-rings of different specifications, thereby achieving axial and radial double sealing. The left sealing end cover 101 and the right sealing end cover 106 are respectively provided with an exhaust interface 114 at the top, and a one-way valve is installed at the exhaust interface 114 to prevent the oil and gas of the left and right cylinders from being mixed, and the reverse flow gas when the piston of the electric piston separator 5 is pressed down returns to the hydraulic oil. The left sealing end cover 101 and the right sealing end cover 106 are respectively provided with an oil circuit interface 107 at the bottom. In order not to affect the vibration effect of the excitation plate 2, the oil and air pipes of the separation cylinder 1 are both made of high-pressure hoses, and the other high-pressure parts are connected with stainless steel oil pipes. The isolation piston ring 102 is arranged in the separation cylinder 104. The isolation piston ring 102 has three grooves 1021 spaced apart in the axial direction on the outer peripheral wall. The piston sealing ring 112, the oil cylinder magnetic ring 111 and the guide ring 110 are arranged in the three grooves 1021 from left to right. There are multiple oil cylinder magnetic induction sensors 109. The multiple oil cylinder magnetic induction sensors 109 are fixed on the outer wall of the separation cylinder 104 through the sensor fixing plate 108 and are evenly distributed along the axial direction of the separation cylinder 104. The oil cylinder magnetic ring 111 cooperates with the oil cylinder magnetic induction sensor 109 to locate the position of the isolation piston ring 102, so as to realize the state display and position control of the isolation piston ring 102. In this embodiment, there are 5 oil cylinder magnetic induction sensors 109. The separation cylinder 104 is a circular cylinder body made of transparent acrylic, which is convenient for observing the position of the isolation piston ring 102 and the oil state of the left and right cylinders. When hydraulic oil is injected into the left cylinder, the hydraulic oil pushes the isolation piston ring 102 to move rightward, and the hydraulic oil of the right cylinder is discharged from the separation cylinder 104. When hydraulic oil is injected into the right cylinder, the hydraulic oil pushes the isolation piston ring 102 to move leftward, and the hydraulic oil of the left cylinder is discharged from the separation cylinder 104. A peristaltic sensor is installed on the pressure relief hose of the second pressure reducing valve 3. When the magnetic sensor signal and the peristaltic sensor signal are detected when the piston of the separation oil cylinder 1 moves to one end, the pump can be automatically stopped.

[0023] See Figure 6The excitation plate 2 includes an excitation plate 201, a wire rope vibration isolator 202, a high-speed vibration motor 203, a vibration transmission frame 204, a motor fixing frame 205 and a cylinder fixing frame 206. The separation cylinder 1 and the electric piston separator 3 are arranged on the front of the excitation plate 201. The high-speed vibration motor 203 is fixed in the middle of the back of the excitation plate 201 through the motor fixing frame 205. The vibration transmission frame 204 is U-shaped, and the arc-shaped part is hooped on the high-speed vibration motor 203, and the two ends are fixedly installed with the bottom of the excitation plate 201. The vibration transmission frame 204 and the motor fixing frame 205 cooperate to transmit high-frequency vibration to the excitation plate 2. There is a pair of wire rope vibration isolators 202, which are arranged at both ends of the length direction of the bottom of the excitation plate 201 to reduce the vibration transmission to the device fixing plate 18. There is a pair of cylinder fixing frames 206, one of which is fixedly mounted on the left sealing end cover 101 of the separation cylinder 1, and the other is fixedly connected to the right sealing end cover 106 of the separation cylinder 1. The bottom of the pair of cylinder fixing frames 206 forms a mounting fold 2061, which is fixed to the excitation plate 201 through the mounting fold 2061. While the electric piston separator 5 is working, the high-speed vibration motor 203 is turned on to vibrate the separation cylinder 104, accelerating the extraction of dissolved air and accelerating the release of tension between oil molecules.

[0024] See Figure 7The electric piston separator 5 includes a piston shaft seal ring 501, a cylinder end cover seal ring 502, a cylinder magnetic ring 503, a screw locking nut 504, a bearing locking nut 505, a screw 506, a screw motor 507, an upper seal end cover 508, a cylinder 509, a plane thrust bearing 510, a bearing gasket 511, a wear-resistant ring 512, a cylinder piston YCC seal ring 513, a lower end cover gasket 514, a lower seal end cover 515, a separator piston 516 and a cylinder magnetic sensor 517. The cylinder 509 is a circular cylinder, and the upper seal end cover 508 and the lower seal end cover 515 are respectively arranged at the top and the bottom of the cylinder 509, wherein the lower seal end cover 515 is an acrylic transparent end cover for observing the oil and gas state in the cylinder 509. The lower sealing end cover 515 is provided with a lower end cover sealing ring 502 on the outer side surface matched with the cylinder 509, and the lower sealing end cover 515 is provided with a lower end cover gasket 514 on the contact surface with the bottom of the cylinder 509. The screw motor 507 is installed on the upper sealing end cover 508 through the motor seat, and the separator piston 516 is located in the cylinder 509 to separate the cylinder 509 into an upper cylinder and a lower cylinder, and the upper end of the screw 506 is connected to the screw motor 507. The separator piston 516 is formed with a bearing accommodating cavity 5161 at the upper end, and a screw accommodating cavity 5162 is formed at the bottom of the bearing accommodating cavity 5161. The plane thrust bearing 510 is arranged in the bearing accommodating cavity 5161, and the bottom of the plane thrust bearing 510 is padded with a bearing gasket 511, and the bearing locking nut 505 is threadedly connected with the outer wall of the bearing accommodating cavity 5161 to fix the plane thrust bearing 510. The lower end of the screw rod 506 passes through the bearing locking nut 505 and the plane thrust bearing 510 and then extends into the screw rod accommodating chamber 5162. The screw rod locking nut 504 is threadedly connected to the lower end of the screw rod 506. The cylinder piston YCC sealing ring 513 and the cylinder magnetic ring 503 are sleeved on the piston 516 at intervals. There is a pair of cylinder piston YCC sealing rings 513. The cylinder magnetic ring 503 is located between the pair of cylinder piston YCC sealing rings 513, and the wear-resistant ring 512 is wrapped outside the cylinder magnetic ring 503. The cylinder magnetic ring 503 can be matched with a magnetic sensor 517 to control the displacement of the separator piston 516. The rotational motion of the screw rod 506 is converted into the linear reciprocating motion of the cylinder piston YCC sealing ring 513. The lower sealing end cover 515 is formed with an air inlet channel 5151 in the middle along the longitudinal direction, and two air pipes 5152 are extended to the left and right sides respectively, one of which is used for exhaust, and a separator outward check valve 6 is arranged on it, and the other air pipe 5152 is used as a pressure measurement port, which is connected to the separator negative pressure sensor 7 through the inward check valve, and is used to measure the pressure in the cylinder 509. The air inlet channel 5151 is connected to the exhaust port 114 of the separation cylinder 1 via the second solenoid valve 4 and the second pressure reducing valve 4.The separator piston 516 forms a piston shaft 5163 at the bottom, and the piston shaft 5163 is matched with the upper port of the air inlet channel 5151 of the lower sealing end cover 515, and the piston shaft sealing ring 501 is arranged on the piston shaft 5163. The piston shaft sealing ring 501 and the cylinder end cover sealing ring 502 cooperate to seal the lower cylinder of the cylinder 509, and the piston shaft sealing ring 501 has a buffering effect. A plurality of cylinder magnetic sensors 517 are arranged at intervals along the height direction of the outer edge of the cylinder 509, and two are used here.

[0025] The screw motor 507 drives the separator piston 516 to move upward in the cylinder 509, so as to extract the dissolved air in the separation cylinder 1. When the separator piston 516 moves to the upper limit or the separator negative pressure sensor 7 measures the set pressure value, which is -0.095pa in this embodiment, the screw motor 507 stops rotating, waits for 30 seconds, closes the second solenoid valve 4, and the screw motor 507 rotates in the opposite direction, driving the separator piston 516 to rotate downward, and exhausts the air from the outward one-way valve 6 at the exhaust port of the electric piston separator 5. Repeat the above actions N times again until the oil gas content detection is qualified.

[0026] See Figure 8The piston type oil and gas content measuring instrument 9 comprises an end cover transition plate 901, an oil-containing shaft sleeve 902, a bottom sealing end cover 903, a measuring cylinder 904, a measuring magnetic ring 905, a measuring piston YCC sealing ring 906, a top cover sealing ring 907, a top sealing end cover 908, a sealing cushion 909, a measuring piston 910, a piston rod 911, a wire sensor fixing frame 912, a wire sensor 913, a connecting rod 914 and a Y-type joint 915. The measuring cylinder 904 is a circular hydraulic cylinder, and the top sealing end cover 908 and the bottom sealing end cover 903 are respectively arranged at the top and the bottom of the measuring cylinder 904, wherein the top sealing end cover 908 is an acrylic transparent end cover, which is used to observe the oil and gas state in the measuring cylinder 904. The top sealing end cover 908 extends measuring device oil pipes 9081 to the left and right sides respectively, one of which is connected to the first ball valve 10 and the third solenoid valve 12 through a pipeline, and the other measuring device oil pipe 9081 is connected to the measuring device negative pressure sensor 8. The top cover sealing ring 907 is arranged on the contact surface between the top sealing end cover 908 and the top of the measuring device cylinder 904, the bottom sealing end cover 903 is supported on the end cover transition plate 901 and penetrates the end cover transition plate 901, the measuring device piston 910 is arranged in the measuring device cylinder 904, the measuring device piston YCC sealing ring 906 has a pair, which is sleeved on the measuring device piston 910 with an interval between the upper and lower parts, and the measuring device magnetic ring 905 is sleeved on the measuring device piston 910 and is located between a pair of measuring device piston YCC sealing rings. Between the sealing rings 906, the piston rod 911 is located below the measuring device piston 910 and the top end is fixedly connected to the measuring device piston 910 by a screw. The top sealing end cover 908 is provided with the sealing buffer pad 909 on the inner wall facing the screw. The bottom end of the piston rod 911 extends downward through the oil-containing sleeve 902 in the bottom sealing end cover 903 and is connected to the Y-type joint 915. The Y-type joint 915 is connected with a standard gravity block, and the gravity of the gravity block itself pulls the piston rod 911 downward. The pull-wire sensor fixing frame 912 is fixedly connected to the end cover transition plate 901, and the pull-wire sensor 913 is fixed on the pull-wire sensor fixing frame 912. The bottom end of the piston rod 911 is also connected to one end of the connecting rod 914, and the other end of the connecting rod 914 is connected to the pull-wire head of the pull-wire sensor 913. The pull-wire sensor 913 is used to collect the displacement data of the measuring device piston 910 for subsequent calculation of the oil and gas content.

[0027] The separated oil is injected into the measuring cylinder 904 through the logic control of the solenoid valve. The system clicks to start measuring, slowly releases the gravity block, and gradually increases the weight until the negative pressure sensor 8 of the measuring device reaches -0.095pa. The displacement of the wire sensor 913 is read by the system, and the gas content α of the oil can be obtained through the volume change conversion formula:

[0028] Among them, V1 is the changed volume, V2 is the volume after extraction and pressure, S is the measuring cylinder area, L1 is the initial position of the pull-wire sensor 913, and L2 is the position of the pull-wire sensor 913 after extraction and pressure.

[0029] Furthermore, the negative pressure isolation oil tank 14 comprises an oil tank, an isolation piston, an ultrasonic vibrator, an air pump, and a negative pressure gauge. The air in the negative pressure isolation oil tank 14 is pumped to below -0.6Mpa by the oil pump 13, and the air in the tank is isolated from contacting the oil again by the isolation piston. The oil can be vibrated by the ultrasonic vibrator to release the tension between the oil molecules again. Fifth, by using the negative pressure isolation oil tank 14, the separated oil is injected into the negative pressure isolation oil tank 14, which can isolate the oil from long-term contact with the air. The air pump and the isolation piston can prevent the air from dissolving into the oil again. At the same time, the effect of the ultrasonic vibrator is also conducive to releasing the tension of the oil molecules, preventing the air from dissolving back into the hydraulic oil quickly during subsequent use.

[0030] The separation method of the hydraulic oil dissolved air ultra-vacuum separation device comprises the following steps.

[0031] Step S1) is oil injection, specifically: S11) Oil filling preparation, select left cylinder oil filling, the system automatically opens the left channel of the first solenoid valve 17, closes the second solenoid valve 4, and opens the third solenoid valve 12; S12) start oil injection, turn on the oil pump 13, the oil pump 13 injects the hydraulic crude oil that has not been separated from the oil and gas in the negative pressure crude oil tank 15 into the left cylinder of the separation cylinder 1, and at the same time, through the action of the piston in the cylinder, the separated oil after the oil and gas separation in the right cylinder of the separation cylinder 1 is discharged into the negative pressure isolation oil tank 14, and when the cylinder piston moves to the specified position, the pump is automatically stopped; S13) Fluid replenishment, select the left cylinder fluid replenishment, the system automatically opens the left channel of the first solenoid valve 17, closes the second solenoid valve 4 and the third solenoid valve 12, and can forcibly start the oil pump 13 to pump hydraulic oil into the left cylinder of the separation cylinder 1 to drive out the air in the left cylinder; Step S2) is vacuum separation and exhaust, specifically: S21) In preparation for air extraction, the system automatically closes the first solenoid valve 17 and the third solenoid valve 12, and opens the second solenoid valve 4; S22) Separate and exhaust gas, start the screw motor 507 of the electric piston separator 5, drive the separator piston 516 to move up and down N times, use the oil-gas separation pressure of 100-6700pa, when the separator negative pressure sensor 7 reaches -0.095Mpa or the screw motor 507 moves to the upper limit, the separator piston 516 stops moving upward, closes the second solenoid valve 4, and after a pause of n seconds, the separator piston 516 starts to move slowly downward. Due to the action of the outward one-way valve 6, the extracted air is discharged outward through the lateral discharge one-way valve of the electric piston separator 5; S23) Accelerate the disturbance, and automatically open the high-frequency excitation plate 2 while separating and pumping air, so that the hydraulic oil is fully disturbed to release the dissolved air; Step S3) is to measure the gas content. S31) Measurement preparation, all valves are automatically closed; S32) Oil filling, open the right channel of the first solenoid valve 17, start the oil pump 13 after 2 seconds, pump the crude oil into the right cylinder of the separation cylinder 1, and squeeze out the separation oil in the left cylinder to the scale line position of the piston type oil and gas content measuring device 9, and automatically close all the solenoid valves; S33) measurement, close the first ball valve 11 at the left end of the piston type oil and gas content measuring instrument 9, release the gravity block until the pressure detected by the negative pressure sensor 8 of the measuring instrument is less than -0.095pa, measure the displacement of the measuring instrument piston 910 by the pull wire sensor 913, automatically calculate the dissolved air content in the hydraulic oil, and judge whether it is qualified.

[0032] Step S4) is to discharge the oil to the negative pressure isolation oil tank 14, specifically: S41)) In preparation for oil discharge, the system automatically opens the right channel of the first solenoid valve 17 and the third solenoid valve 12, and closes the second solenoid valve 4; S42) Start the oil injection, start the oil pump 13, and inject the hydraulic crude oil that has not been separated from the oil and gas into the right cylinder of the separation cylinder 1. At the same time, through the action of the isolation piston ring 102 in the cylinder, the separated oil after the oil and gas separation in the left cylinder of the separation cylinder 1 is discharged into the negative pressure isolation oil tank 14. When the isolation piston ring 102 of the separation cylinder 1 moves to the specified position, the pump is automatically stopped.

[0033] The above is to complete the oil-gas separation process of the left cylinder hydraulic oil of the separation cylinder 1. The right cylinder hydraulic oil repeats the above action. After the oil-gas separation adjustment is stable, the parameters can be set and the negative pressure isolation oil tank 14 can be automatically operated until it reaches a full liquid state, and the oil is stored statically. The automatic control of the present invention is realized through the control system and the control panel equipped therewith.

Claims

1. A hydraulic oil dissolved air ultra-vacuum separation device, characterized in that: The invention comprises a separation oil cylinder (1), an excitation plate (2), a second pressure reducing valve (3), a second solenoid valve (4), an electric piston separator (5), a separator outward check valve (6), a separator negative pressure sensor (7), a measuring device negative pressure sensor (8), a piston type oil and gas content measuring device (9), a first ball valve (10), a second ball valve (11), a third solenoid valve (12), an oil pump (13), a negative pressure isolation oil tank (14), a negative pressure crude oil tank (15), a first pressure reducing valve (16) and a first solenoid valve (17). The separation oil cylinder (1) is arranged on the excitation plate (2), and includes a left cylinder and a right cylinder isolated from each other. The left cylinder and the right cylinder respectively have an oil circuit interface (107) at the bottom and an exhaust interface (114) at the top. The first solenoid valve (17) is a three-position four-way solenoid valve. The first oil port of the first solenoid valve (17) is connected to the first oil port of the third solenoid valve (12). The second oil port of the third solenoid valve (12) is divided into two paths, one of which is connected to the piston oil and gas content through the manual first ball valve (10). The measuring device (9) is connected to the negative pressure isolation oil tank (14) through the manual second ball valve (11), the third oil port of the third solenoid valve (12) is connected to the negative pressure isolation oil tank (14), the second oil port of the first solenoid valve (17) is connected to the oil circuit interface (107) of the left cylinder of the separation oil cylinder (1), the fourth oil port of the first solenoid valve (17) is connected to the oil circuit interface (107) of the right cylinder of the separation oil cylinder (1), the third oil port of the first solenoid valve (17) is connected to the first pressure reducing valve (16), and the first pressure reducing valve (16) is connected to the oil pump ( 13), the oil pump (13) is connected to the negative pressure oil tank (15), the exhaust interface (114) of the left cylinder and the exhaust interface (114) of the right cylinder of the separation oil cylinder (1) are respectively connected to the first interface of the second pressure reducing valve (3) through pipelines provided with an outward one-way air valve, the second interface of the second pressure reducing valve (3) is connected to the negative pressure isolation oil tank (14), the third interface of the second pressure reducing valve (3) is connected to the first interface of the second solenoid valve (4), and the second interface of the second solenoid valve (4) is connected to the electric piston separator (5).

2. The hydraulic oil dissolved air ultra-vacuum separation device according to claim 1, characterized in that: The separation oil cylinder (1) comprises a left sealing end cover (101), an isolating piston ring (102), a tightening screw (103), a separation cylinder (104), an oil cylinder end cover sealing ring (105), a right sealing end cover (106), an oil circuit interface (107), a sensor fixing plate (108), an oil cylinder magnetic induction sensor (109), a guide ring (110), an oil cylinder magnetic ring (111), a piston sealing ring (112) and a tightening stud (11 3), the left sealing end cover (101) and the right sealing end cover (106) are respectively arranged at the two ends of the separation cylinder (104), and a cylinder end cover sealing ring (105) is arranged between the separation cylinder (104) and the left sealing end cover (101) and the right sealing end cover (106). The left sealing end cover (101) and the right sealing end cover (106) are fastened by the cooperation of the tightening screw (103) and the tightening stud (113). The cover (101) and the right sealing end cover (106) are respectively provided with an exhaust interface (114) at the top and an oil circuit interface (107) at the bottom. The isolation piston ring (102) is arranged in the separation cylinder (104). The isolation piston ring (102) has three grooves (1021) distributed axially on the outer peripheral wall. The piston sealing ring (112), the oil cylinder magnetic ring (111) and the guide ring (110) are arranged in the three grooves (1021) from left to right. There are multiple oil cylinder magnetic induction sensors (109). The multiple oil cylinder magnetic induction sensors (109) are fixed on the outer wall of the separation cylinder (104) through a sensor fixing plate (108) and are evenly distributed along the axial direction of the separation cylinder (104). The oil cylinder magnetic ring (111) cooperates with the oil cylinder magnetic induction sensor (109) to realize the state display and position control of the isolation piston ring (102).

3. The hydraulic oil dissolved air ultra-vacuum separation device according to claim 1, characterized in that: The excitation plate (2) comprises an excitation plate (201), a wire rope vibration isolator (202), a high-speed vibration motor (203), a vibration transmission frame (204), a motor fixing frame (205) and a cylinder fixing frame (206). The front of the excitation plate (201) is provided with the separation cylinder (1) and the electric piston separator (3). The high-speed vibration motor (203) is fixed to the middle of the back of the excitation plate (201) through the motor fixing frame (205). The vibration transmission frame (204) is U-shaped, and the arc-shaped portion is hooped on the high-speed vibration motor (203). The two ends are fixedly installed with the bottom of the excitation plate (201). The guide frame (204) and the motor fixing frame (205) cooperate to transmit high-frequency vibration to the vibration plate (2). The steel wire rope vibration isolators (202) are provided in a pair and are arranged at both ends of the length direction of the bottom of the vibration plate (201). The oil cylinder fixing frames (206) are provided in a pair, one of which is fixedly installed with the left sealing end cover (101) of the separation oil cylinder (1), and the other oil cylinder fixing frame (206) is fixedly connected with the right sealing end cover (106) of the separation oil cylinder (1). The bottom of the pair of oil cylinder fixing frames (206) forms an installation folding edge (2061), and is fixed to the vibration plate (201) through the installation folding edge (2061).

4. The hydraulic oil dissolved air ultra-vacuum separation device according to claim 1, characterized in that: The electric piston separator (5) comprises a piston shaft sealing ring (501), a cylinder end cover sealing ring (502), a cylinder magnetic ring (503), a screw locking nut (504), a bearing locking nut (505), a screw (506), a screw motor (507), an upper sealing end cover (508), a cylinder (509), a plane thrust bearing (510), a bearing gasket (511), a wear-resistant ring (512), a cylinder piston YCC sealing ring (513), a lower end cover gasket (514), a lower sealing end cover (515), a separator piston (516) and a cylinder magnetic sensor (517). The upper sealing end cover (508) and the lower sealing end cover (515) are respectively arranged at the top and the bottom of the cylinder (509). The lower sealing end cover (515) is provided with a lower end cover sealing ring (502) on the outer side surface matched with the cylinder (509), and the lower sealing end cover (515) is provided with a lower end cover gasket (514) on the contact surface with the bottom of the cylinder (509). The screw motor (507) is installed on the upper sealing end cover (508) through the motor seat. The separator piston (516) is located in the cylinder (509) to separate the cylinder (509) into an upper cylinder and a lower cylinder. The upper end of the screw (506) is connected to the screw motor (507). The separator piston (516) is formed with a bearing accommodating cavity (5161) at the upper end, and a screw accommodating cavity (5162) is formed at the bottom of the bearing accommodating cavity (5161). The plane The thrust bearing (510) is arranged in the bearing accommodating cavity (5161), the bottom of the plane thrust bearing (510) is padded with a bearing gasket (511), the bearing locking nut (505) is threadedly connected to the outer wall of the bearing accommodating cavity (5161) to fix the plane thrust bearing (510), the lower end of the screw rod (506) passes through the bearing locking nut (505) and the plane thrust bearing (510) and then extends into the screw rod accommodating cavity (5162), the screw rod locking nut (504) is threadedly connected to the lower end of the screw rod (506), the cylinder piston YCC sealing ring (513) and the cylinder magnetic ring (503) are spaced and sleeved on the piston (516), and the cylinder piston YCC sealing ring (513) has a Yes, the cylinder magnetic ring (503) is located between a pair of cylinder piston YCC sealing rings (513). When the cylinder magnetic ring (503) is equipped with a magnetic sensor, it is used to control the displacement of the separator piston (516). The wear-resistant ring (512) is wrapped around the cylinder magnetic ring (503). The lower sealing end cover (515) is formed with an intake channel (5151) connected to the second solenoid valve (4) through a pipeline in the middle along the longitudinal direction, and two air pipes (5152) are extended to the left and right sides respectively, one of which is used for exhaust and is provided with a separator outward one-way valve (6), and the other air pipe (5152) is used as a pressure measurement port, which is connected to the separator negative pressure sensor (7) through an inward one-way valve.Used to measure the pressure in the cylinder (509), the separator piston (516) forms a piston shaft (5163) at the bottom, the piston shaft (5163) is matched with the upper port of the air inlet channel (5151) of the lower sealing end cover (515), the piston shaft sealing ring (501) is arranged on the piston shaft (5163), and a plurality of cylinder magnetic sensors (517) are arranged at intervals along the height direction outside the cylinder (509).

5. The hydraulic oil dissolved air ultra-vacuum separation device according to claim 1, characterized in that: The piston type oil and gas content measuring device (9) comprises an end cover transition plate (901), an oil-containing shaft sleeve (902), a bottom sealing end cover (903), a measuring device cylinder (904), a measuring device magnetic ring (905), a measuring device piston YCC sealing ring (906), a top cover sealing ring (907), a top sealing end cover (908), a sealing cushion (909), a measuring device piston (910), a piston pull rod (911), a wire sensor fixing frame (912), a wire sensor (913), a connecting rod (914) and a Y-type joint (915), wherein the top sealing end cover (908) and the bottom sealing end cover (903) are The top sealing end cover (908) is separately arranged at the top and bottom of the measuring device cylinder body (904), and the top sealing end cover (908) extends the measuring device oil pipe (9081) to the left and right sides respectively. One of the measuring device oil pipes (9081) is connected to the third solenoid valve (12) and the first ball valve (10) through a pipeline, and the other measuring device oil pipe (9081) is connected to the measuring device negative pressure sensor (8). The top cover sealing ring (907) is arranged on the contact surface between the top sealing end cover (908) and the top of the measuring device cylinder body (904). The bottom sealing end cover (903) is supported on the end cover transition plate (901) and penetrates the end cover transition plate (901). The measuring device piston (910) is arranged in the measuring cylinder (904), the measuring piston YCC sealing ring (906) has a pair, which is sleeved on the measuring piston (910) with an interval between the upper and lower parts, the measuring magnetic ring (905) is sleeved on the measuring piston (910) and is located between a pair of top cover sealing rings (907), the piston pull rod (911) is located below the measuring piston (910) and the top end is fixedly connected to the measuring piston (910) by a screw, the top sealing end cover (908) is provided with the sealing buffer pad (909) on the inner wall facing the screw, and the bottom end of the piston pull rod (911) passes through the bottom sealing end cover ( The oil-containing shaft sleeve (902) in the piston rod (903) extends downward and is connected to the Y-type joint (915), and a gravity block is connected to the Y-type joint (915). The pull-wire sensor fixing frame (912) is fixedly connected to the end cover transition plate (901), and the pull-wire sensor (913) is fixed on the pull-wire sensor fixing frame (912). The bottom end of the piston pull rod (911) is also connected to one end of the connecting rod (914), and the other end of the connecting rod (914) is connected to the pull-wire head of the pull-wire sensor (913). The pull-wire sensor (913) is used to collect displacement data of the measuring device piston (910).

6. The hydraulic oil dissolved air ultra-vacuum separation device according to claim 1, characterized in that: It also includes a device fixing plate (18), on which the separation cylinder (1), the excitation plate (2), the second pressure reducing valve (3), the second solenoid valve (4), the electric piston separator (5), the separator outward check valve (6), the separator negative pressure sensor (7), the measuring device negative pressure sensor (8), the piston oil and gas content measuring device (9), the first ball valve (10), the second ball valve (11), the third solenoid valve (12), the oil pump (13), the first pressure reducing valve (16) and the first solenoid valve (17) are arranged, and the wire rope vibration isolator (202) is used to reduce the vibration transmitted to the device fixing plate (18).

7. A separation method of a hydraulic oil dissolved air ultra-vacuum separation device as claimed in claim 1, characterized in that: The steps include: S1) oil filling, the oil pump (13) transports crude oil from the negative pressure crude oil tank (15) to the separation cylinder (1), and by switching the first solenoid valve (17), the separation cylinder (1) is filled with oil from the left cylinder and discharged from the right cylinder, or filled with oil from the right cylinder and discharged from the left cylinder; S2) Vacuum separation and air extraction. After the oil fills the separation cylinder (1), the first solenoid valve (17) is closed to cut off the oil filling and discharging pipelines. The second solenoid valve (4) is then opened to connect the air extraction pipeline. The screw motor (507) drives the separator piston (516) to move upward. When the separation pressure is reached, the dissolved air in the oil is extracted. The second solenoid valve (4) is then closed. The screw motor (507) drives the separator piston (516) in the opposite direction to discharge the extracted air from the cylinder (509). The separator piston (516) moves up and down N times until the standard requirements are met. S3) measuring the gas content, injecting a small amount of separated hydraulic oil into the piston type oil gas content measuring device (9), recording the displacement of the wire displacement sensor (913) at this moment, and then releasing the gravity block until the value of the negative pressure sensor (8) of the measuring device reaches the set pressure value for the first time, reading the displacement of the wire displacement sensor (913), and obtaining the oil gas content; S4) discharges oil to the negative pressure isolation oil tank (14), switches the first solenoid valve (17), connects the third solenoid valve (12), starts the oil pump (13), and if the left cylinder of the separation oil cylinder (1) is full of oil, then injects crude oil into the right cylinder of the separation oil cylinder (1), and then discharges the oil in the left cylinder of the separation oil cylinder (1) into the negative pressure isolation oil tank (14) through the isolation piston ring (102).

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