Oil injection system for CT tube

Abstract

This utility model discloses an oil injection system for CT X-ray tubes, belonging to the field of medical device technology. The oil injection system includes an oil storage tank, an ultrasonic gas separator, a vacuum negative pressure device, and an oil circulation device. The oil storage tank stores insulating oil; the ultrasonic gas separator is connected to the oil storage tank and is configured to remove gas from the insulating oil; the vacuum negative pressure device has a movable CT X-ray tube inside its cavity, connected to the ultrasonic gas separator, and connected to a negative pressure generator, configured to reduce the gas content inside the CT X-ray tube; the oil circulation device forms an oil injection circuit by connecting the CT X-ray tube and the oil storage tank, allowing insulating oil to be injected into the CT X-ray tube. Before being injected into the CT X-ray tube, the insulating oil passes through the ultrasonic gas separator, which removes gas from the insulating oil, thereby reducing the gas content and improving the imaging geometric accuracy of the CT X-ray tube.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an oil injection system suitable for CT tubes. Background Technology

[0002] The CT tube is the core component of a CT scanner. It generates X-rays by bombarding a target with a high-speed electron beam, but this process generates a lot of heat, so insulating oil is needed for heat dissipation. However, if gas molecules are present in the insulating oil, the bubbles reduce the dielectric strength of the insulating oil, causing partial discharge, electromagnetic interference, and image artifacts, which in turn affect the geometric accuracy of the image. Therefore, the insulating oil needs to be vented before it is injected to cool it.

[0003] In some existing oil injection and venting systems, the venting channels are often poorly designed in terms of gas separation. The routing and dimensions do not adequately consider insulation characteristics, flow characteristics, and bubble evacuation paths. Problems such as numerous bends and small pipe diameters result in high oil flow resistance and easy bubble retention. Therefore, existing oil injection and venting systems cannot meet the venting requirements of oil injection systems suitable for CT X-ray tubes. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an oil injection system suitable for CT tubes, which can effectively reduce the content of gas molecules in the insulating oil, thereby ensuring high imaging geometric accuracy.

[0005] According to an embodiment of the present invention, a CT tube lubrication system is available, comprising:

[0006] An oil storage tank, the oil storage tank being used to store insulating oil;

[0007] An ultrasonic gas separator is connected to the oil storage tank via a connecting pipe, and the ultrasonic gas separator is configured to separate and discharge the gas in the insulating oil.

[0008] A vacuum negative pressure device, wherein the inner cavity of the vacuum negative pressure device is provided with a movable CT tube, the CT tube is connected to the ultrasonic gas separation device through a connecting pipe, the vacuum negative pressure device is connected to a negative pressure generator, and the vacuum negative pressure device is configured to reduce the gas inside the CT tube;

[0009] An oil circulation device, wherein the oil circulation device is connected to the CT tube via a connecting pipe, and the oil circulation device forms an oil injection circuit by connecting the CT tube and the oil storage tank, so as to inject the insulating oil into the CT tube; and

[0010] A filtration device is provided, which is connected to the oil storage tank and the ultrasonic gas separator via connecting pipes. The filtration device is located between the oil storage tank and the ultrasonic gas separator and is configured to filter impurities in the insulating oil in the oil storage tank.

[0011] The oil injection system for CT tubes according to the present invention has at least the following beneficial effects: before the insulating oil is injected into the CT tube, it passes through the ultrasonic gas separation device, which can separate and discharge the gas in the insulating oil, thereby reducing the gas content of the insulating oil and improving the imaging geometric accuracy of the CT tube.

[0012] According to some embodiments of the present invention, the ultrasonic gas separation device includes an ultrasonic generator, a cooling oil channel, and a negative pressure chamber. The ultrasonic generator is disposed on the cooling oil channel and acts on the insulating oil in the cooling oil channel. One end of the cooling oil channel is connected to the oil storage tank through a connecting pipe, and the other end of the cooling oil channel is connected to the CT tube through a connecting pipe. An isolation membrane is provided between the negative pressure chamber and the cooling oil channel. The negative pressure chamber is connected to the negative pressure generator. The isolation membrane allows gas in the insulating oil to pass through the isolation membrane from the cooling oil channel into the negative pressure chamber.

[0013] According to some embodiments of this utility model, the separator is a polytetrafluoroethylene film.

[0014] According to some embodiments of the present invention, the ultrasonic gas separation device includes:

[0015] A separation sleeve, wherein the inner wall of the separation sleeve is provided with cooling oil channels, the cooling oil channels being arranged in a spiral groove configuration, and the ultrasonic generators are arranged in a ring on the outer wall of the separation sleeve; and

[0016] A fixed cylinder is inserted into the separation tube sleeve. An isolation membrane is provided between the fixed cylinder and the inner wall of the separation tube sleeve. A negative pressure cavity is provided at the center of the fixed cylinder. The fixed cylinder is provided with a connecting hole. The connecting hole connects the negative pressure cavity and the cooling oil passage. Gas in the cooling oil passage can pass through the isolation membrane and enter the negative pressure cavity in the fixed cylinder.

[0017] According to some embodiments of the present invention, the cross-section of the cooling oil passage is a flat rectangle, and the length direction of the cross-section of the cooling oil passage extends along the axial direction of the separator sleeve.

[0018] According to some embodiments of the present invention, the inlet and outlet ends of the cooling oil passage extend along the tangential direction of the cooling oil passage, and the inlet and outlet ends of the cooling oil passage are respectively connected to the oil storage tank and the CT tube through connecting pipes.

[0019] According to some embodiments of the present invention, a heating layer is embedded in the separation sleeve, and the heating layer is used to heat the insulating oil in the cooling oil channel.

[0020] According to some embodiments of the present invention, a pulse valve is provided between the oil storage tank and the ultrasonic gas separation device, and the pulse valve is provided on the connecting pipe between the oil storage tank and the ultrasonic gas separation device.

[0021] According to some embodiments of the present invention, the CT tube is movably mounted on the vacuum negative pressure device via a mounting bracket.

[0022] According to some embodiments of the present invention, it also includes an oil replenishment tank, which is connected to the oil storage tank via a connecting pipe, and the oil replenishment tank can replenish insulating oil to the oil storage tank.

[0023] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0025] Figure 1 This is a schematic diagram of the oil injection system for CT X-ray tubes according to an embodiment of the present invention;

[0026] Figure 2 for Figure 1 A cross-sectional schematic diagram of an ultrasonic gas separation device is shown.

[0027] Figure 3 for Figure 2 A partial cross-sectional view of the ultrasonic gas separation device is shown (partial structure omitted).

[0028] Figure 4 for Figure 2 The diagram shown is a partially enlarged view.

[0029] Icon labels:

[0030] CT tube 1;

[0031] Oil storage tank 10; pulse valve 11; oil replenishment tank 12; filter device 13;

[0032] Ultrasonic gas separation device 20; ultrasonic generator 21; cooling oil passage 22; liquid inlet 221; liquid outlet 222; negative pressure chamber 23; isolation membrane 24; separation sleeve 25; fixed cylinder 26; connecting hole 27;

[0033] Vacuum negative pressure device 30;

[0034] Oil circulation device 40;

[0035] Negative pressure generator 50. Detailed Implementation

[0036] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] In the description of this utility model, the use of "first" and "second" is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features or the order of the technical features.

[0038] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0039] Reference Figure 1According to a first aspect of the present invention, an oil injection system for a CT X-ray tube includes an oil storage tank 10, an ultrasonic gas separator 20, a vacuum negative pressure device 30, an oil circulation device 40, and a filter device 13. The oil storage tank 10 stores insulating oil; the ultrasonic gas separator 20 is connected to the oil storage tank 10 via a connecting pipe (not shown in the figure), and is configured to separate and discharge / remove gas from the insulating oil; the vacuum negative pressure device 30 has a movable CT X-ray tube 1 inside its cavity, and the CT X-ray tube 1 is connected to the ultrasonic gas separator 20 via a connecting pipe; the vacuum negative pressure device 30 is connected to a negative pressure generator 50, and is configured to reduce the gas inside the CT X-ray tube 1; the oil circulation device 40 is connected to the CT X-ray tube 1 via a connecting pipe, and forms an oil injection circuit by connecting the CT X-ray tube 1 and the oil storage tank 10, so that insulating oil is injected into the CT X-ray tube 1. The filter device 13 is connected to the oil storage tank 10 and the ultrasonic gas separator 20 through connecting pipes. The filter device 13 is located between the oil storage tank 10 and the ultrasonic gas separator 20. The filter device 13 is configured to filter impurities in the insulating oil in the oil storage tank 10.

[0040] The oil injection system for CT tubes of this invention, through its unique design, effectively solves the problem of low imaging accuracy caused by the presence of gas molecules in the insulating oil of the CT tube, bringing about many significant benefits.

[0041] Regarding improved imaging accuracy, the ultrasonic gas separation device 20 can precisely separate and remove gas molecules from the insulating oil, greatly reducing the absorption and scattering of X-rays in the insulating oil. This makes the intensity of X-rays actually reaching the detector more stable and uniformly distributed, effectively reducing image noise, significantly improving image contrast, and enabling clearer presentation of the details of the scanned object, providing more accurate and reliable image data for medical diagnosis and industrial inspection. From the perspective of ensuring the performance of the CT tube 1, the vacuum negative pressure device 30 reduces the gas inside the CT tube 1, and together with the ultrasonically degassed insulating oil, reduces the generation of air bubbles in the insulating oil. This not only ensures the continuity and uniformity of the insulating oil and greatly improves heat conduction efficiency, allowing the heat generated by the anode target surface to be quickly and evenly transferred away, maintaining the stability of the internal temperature of the CT tube 1, but also avoids damage such as deformation and melting of the anode target surface caused by local overheating, effectively extending the service life of the CT tube 1 and reducing equipment maintenance costs. In terms of system stability, the entire oil injection system forms an oil injection loop through the oil circulation device 40, realizing the circulation and continuous purification of the insulating oil. During the circulation process, the insulating oil continuously passes through the ultrasonic gas separation device 20, ensuring that the gas molecules in the insulating oil are always at a low level. This ensures that the cooling effect of the CT tube 1 is stable under different working conditions, while avoiding electrical faults such as partial discharge caused by gas molecule ionization, thus improving the overall operational stability and reliability of the CT system.

[0042] Specifically, in some embodiments, the oil injection system for CT tubes of this invention is used in a high-end medical CT device. The specific configuration and working process of each component of the system are as follows:

[0043] The oil storage tank 10 is made of high-pressure resistant and corrosion-resistant stainless steel with a volume of 50L. It can stably store insulating oil that has undergone strict screening and pretreatment, ensuring that the initial quality of the insulating oil meets the requirements.

[0044] The ultrasonic gas separation device 20 uses a 40kHz ultrasonic generator 21, paired with a customized degassing chamber. Insulating oil enters the degassing chamber from the oil storage tank 10 through a pipeline at a flow rate of 5L / min. Under the action of ultrasound, gas molecules in the insulating oil rapidly aggregate to form tiny bubbles, which float to the surface and are discharged through the exhaust port at the top. The vacuum negative pressure device 30 is a large, sealed chamber made of high-strength aluminum alloy. Inside, it houses a CT tube 1 mounting bracket (not shown in the figure) that can rotate 360 ​​degrees and vibrate, meeting the installation requirements of different models of CT tubes 1. After the CT tube 1 to be injected is installed on the bracket, the negative pressure generator 50 reduces the air pressure inside the chamber to below 0.01MPa, further expelling residual gas from the CT tube 1. Under negative pressure, the ultrasonically degassed insulating oil is injected into the CT tube 1 through a pipeline at a flow rate of 3L / min. Combined with rotation and vibration, this ensures that the insulating oil fully fills the internal space of the tube and prevents the formation of bubbles due to residual gas. The oil circulation device 40 consists of an oil pump, a filter, circulating oil pipes, and connecting pipes. A high-performance oil pump with a flow rate of 8 L / min and a head of 5 m is selected to ensure stable circulation of the insulating oil in the oil injection circuit. The filter uses a 1 μm filter element, which can effectively remove minute impurities and potentially re-evolved gas molecules from the insulating oil. After flowing out of the CT tube 1, the insulating oil is filtered, first entering the circulating oil tank for buffering, and then returning to the storage tank 10, forming a complete circulation loop. During the CT equipment's circulating oil injection operation, the oil circulation device 40 continuously operates to maintain the purity and cooling performance of the insulating oil. The filter device 13 is located between the storage tank 10 and the ultrasonic gas separator 20, and is configured to filter impurities in the insulating oil in the storage tank 10.

[0045] Therefore, it is understood that the oil injection system for CT tubes according to the first aspect of the present invention has at least the following beneficial effects: before the insulating oil is injected into the CT tube 1, it passes through the ultrasonic gas separation device 20, which can discharge the gas in the insulating oil, thereby reducing the gas content of the insulating oil and thus improving the imaging geometric accuracy of the CT tube 1.

[0046] Reference Figures 2 to 4In some embodiments of this utility model, the ultrasonic gas separation device 20 includes an ultrasonic generator 21, a cooling oil channel 22, and a negative pressure chamber 23. The ultrasonic generator 21 is disposed on the cooling oil channel 22 and acts on the insulating oil in the cooling oil channel 22. One end of the cooling oil channel 22 is connected to the oil storage tank 10 through a connecting pipe, and the other end of the cooling oil channel 22 is connected to the CT tube 1 through a connecting pipe. An isolation membrane 24 is disposed between the negative pressure chamber 23 and the cooling oil channel 22. The negative pressure chamber 23 is connected to the cooling oil channel 22 through the isolation membrane 24 and is connected to the negative pressure generator 50. The isolation membrane 24 allows gas molecules in the insulating oil to pass through the isolation membrane 24 from the cooling oil channel 22 and enter the negative pressure chamber 23.

[0047] The ultrasonic generator 21 of the ultrasonic gas separation device 20 is an intelligent ultrasonic generator with adjustable power and a frequency range of 20kHz to 50kHz. During actual operation, the power and frequency of the ultrasonic generator 21 are flexibly adjusted via the control panel or preset program according to the initial gas content and viscosity of the insulating oil, as well as the specific requirements of the CT tube 1 for the purity of the insulating oil. For example, when a high gas content is detected in the insulating oil, the power of the ultrasonic generator 21 is appropriately increased to enhance the ultrasonic energy it generates, thereby more effectively promoting the aggregation of gas molecules in the insulating oil to form bubbles. Simultaneously, the frequency is adjusted according to the viscosity characteristics of the insulating oil; for insulating oils with higher viscosity, the frequency is appropriately reduced to increase the propagation depth and effect of the ultrasonic waves in the insulating oil, ensuring efficient degassing of insulating oils in different states.

[0048] The cooling oil channel 22 is constructed of high-strength, corrosion-resistant stainless steel, with its inner wall finely polished to reduce resistance to the insulating oil flow and prevent impurities from adhering. One end of the cooling oil channel 22 is tightly connected to the oil storage tank 10 via a connecting pipe and a high-precision sealing joint, ensuring smooth flow of insulating oil from the storage tank 10 into the cooling oil channel 22. A flow regulating valve (or pulse flow regulating valve) is installed at the connection point to precisely control the flow rate of insulating oil from the storage tank 10 into the cooling oil channel 22 according to the overall system operation requirements and the degassing progress of the insulating oil. The flow rate regulation range is set from 1L / min to 10L / min. The other end of the cooling oil channel 22 is also reliably sealed and connected to the CT tube 1, ensuring stable and leak-free injection of insulating oil into the CT tube 1 after degassing.

[0049] The negative pressure chamber 23 is made of high-strength aluminum alloy, possessing excellent sealing performance and structural stability. Its internal space is rationally designed to effectively collect the gas separated from the insulating oil during the degassing process. The negative pressure chamber 23 is connected to the cooling oil channel 22 via a separation membrane 24 with good flexibility and chemical stability. This separation membrane 24 is made of a specially formulated polytetrafluoroethylene film, its thickness precisely calculated and experimentally verified. It effectively isolates the insulating oil from the gas within the negative pressure chamber 23 under normal operating conditions, preventing insulating oil leakage into the chamber, while allowing gas molecules released from the insulating oil to pass through smoothly. In actual operation, under the influence of ultrasound, the separation membrane 24 vibrates slightly with the generation and movement of bubbles in the insulating oil, facilitating the faster passage of gas molecules through the membrane 24 into the negative pressure chamber 23.

[0050] The negative pressure chamber 23 is connected to the negative pressure generator 50 via a pressure-resistant pipe. The negative pressure generator 50 uses a high-performance rotary vane vacuum pump, whose pumping rate can be adjusted from 10L / s to 50L / s according to actual degassing requirements. Before the separation and degassing operations begin, the negative pressure generator 50 is started to evacuate the negative pressure chamber 23, rapidly reducing the pressure inside to a negative pressure state of 0.001MPa to 0.01MPa. As the insulating oil flows in the cooling oil channel 22, the ultrasonic waves generated by the ultrasonic generator 21 cause gas molecules in the insulating oil to aggregate and form bubbles. Under the pressure difference between the negative pressure chamber 23 and the cooling oil channel 22, these bubbles rapidly pass through the isolation membrane 24 into the negative pressure chamber 23 and are promptly extracted from the system by the negative pressure generator 50, thereby achieving efficient removal of gas from the insulating oil.

[0051] During actual operation of industrial CT inspection equipment, the ultrasonic gas separation device 20 operated continuously and stably. Regular sampling and testing of the insulating oil revealed a significant reduction in gas content, effectively ensuring the purity of the insulating oil after filling the CT tube 1. This, in turn, improved the imaging accuracy and system stability of the industrial CT inspection equipment, reduced detection errors caused by gas in the insulating oil, and provided reliable technical support for industrial product quality inspection.

[0052] Reference Figures 2 to 4In some embodiments of this utility model, the ultrasonic gas separation device 20 includes a separation sleeve 25 and a fixed cylinder 26. A cooling oil channel 22 is provided on the inner wall of the separation sleeve 25, and the cooling oil channel 22 is arranged in a spiral groove. An ultrasonic generator 21 is arranged in a ring on the outer wall of the separation sleeve 25. The fixed cylinder 26 passes through the middle of the separation sleeve 25, and an isolation membrane 24 is provided between the fixed cylinder 26 and the inner wall of the separation sleeve 25. A negative pressure cavity 23 is provided at the center of the fixed cylinder 26. The fixed cylinder 26 is provided with a connecting hole 27, which allows gas in the negative pressure cavity 23 and the cooling oil channel 22 to pass through the isolation membrane 24 and enter the negative pressure cavity 23 in the fixed cylinder 26.

[0053] The separation sleeve 25 of the ultrasonic gas separation device 20 is made of high-strength, corrosion-resistant, and thermally conductive copper alloy. Its outer diameter is 150mm, inner diameter is 120mm, and overall length is 500mm (specific parameters of the separation sleeve 25 are not specifically limited). A spiral groove cooling oil channel 22 is embedded in the inner wall of the separation sleeve 25. The spiral pitch of the cooling oil channel 22 is 30mm, and the number of spiral turns is 10 (specific parameters of the cooling oil channel 22 are not specifically limited). This spiral design greatly extends the flow path of the insulating oil within the separation sleeve 25, allowing the insulating oil to more fully contact the ultrasonic waves generated by the ultrasonic generator 21, effectively increasing the degassing time and the effective area, and improving the degassing efficiency. The ultrasonic generator 21 uses a 500W ring-shaped ultrasonic transducer group with an adjustable frequency range of 30kHz to 45kHz, with a total of 8 groups evenly distributed in a ring on the outer wall of the separation sleeve 25. Each ultrasonic transducer is equipped with an independent power adjustment module and frequency adjustment module, which can be adjusted in real time according to the actual detected state of the insulating oil (such as gas content, viscosity, etc.). For example, at the initial stage of the oil injection system startup, the insulating oil may contain a lot of gas. At this time, the power of the ultrasonic generator 21 is adjusted to a higher level (such as 450W) and the frequency is set to 35kHz to quickly promote the aggregation of gas molecules to form bubbles. As the degassing process proceeds, the gas content in the insulating oil gradually decreases, and the power can be appropriately reduced (such as 350W) and the frequency finely adjusted (such as 40kHz) to ensure the degassing effect while reducing energy consumption and minimizing the impact on other properties of the insulating oil.

[0054] The fixing cylinder 26 is made of the same copper alloy as the separating sleeve 25, with an outer diameter of 80mm, an inner diameter of 50mm, and a length of 500mm, the same as the separating sleeve 25. The fixing cylinder 26 is precisely machined and assembled into the middle of the separating sleeve 25, maintaining coaxiality with it. A special elastic sealant is used to tightly fix the separator 24 between the fixing cylinder 26 and the inner wall of the separating sleeve 25. The separator 24 is a 0.1mm thick polytetrafluoroethylene composite membrane. This composite membrane not only has excellent chemical stability and corrosion resistance, effectively resisting the erosion of chemicals that may be present in the insulating oil, but also has good flexibility and permeability, ensuring that gas molecules released from the insulating oil can pass through smoothly while preventing leakage. A negative pressure cavity 23 is formed in the central area of ​​the fixing cylinder 26. Multiple connecting holes 27 with a diameter of 5mm are evenly distributed on the side wall of the fixing cylinder 26, with a total of 20 (or more) connecting holes 27. These connecting holes 27 connect the negative pressure chamber 23 to the space inside the isolation membrane 24. When the negative pressure generator 50 is started, a negative pressure environment is formed inside the negative pressure chamber 23 (the air pressure can be reduced to 0.005 MPa). Under the action of ultrasound, gas molecules in the insulating oil aggregate to form bubbles. Under the action of pressure difference, the bubbles pass through the isolation membrane 24 and quickly enter the negative pressure chamber 23 through the connecting holes 27. The negative pressure chamber 23 is connected to the negative pressure generator 50 (using a rotary vane vacuum pump with a pumping rate of 30 L / s) through a pressure-resistant rubber hose. The gas entering the negative pressure chamber 23 is promptly extracted from the system, thereby achieving efficient removal of gas from the insulating oil.

[0055] Of course, it is also understandable that, referring to Figure 2 as well as Figure 4 It can be seen that the fixing cylinder 26 in this embodiment of the present invention can also be set as a cylindrical fixing net. The cylindrical fixing net can facilitate the passage of gas in the cooling oil channel through the isolation membrane 24, thereby facilitating the separation of insulating oil gas.

[0056] In actual operation of medical CT equipment, the ultrasonic gas separation device 20 demonstrated excellent performance. Regular analysis of the insulating oil revealed a significant reduction in gas content after treatment by this device. Simultaneously, due to the synergistic effect of the spiral cooling oil channel 22 and the annularly distributed ultrasonic generator 21, the insulating oil flows uniformly within the separation sleeve 25, ensuring consistent ultrasonic action and guaranteeing the uniformity and stability of oil degassing. This not only effectively improves the cooling effect of the CT tube 1 and extends its service life, but also significantly enhances the imaging quality of CT images, providing clearer and more accurate image data for clinical diagnosis.

[0057] Reference Figure 4In some embodiments of the utility model, the cross-section of the cooling oil channel 22 is a flat rectangle, and the length direction of the cross-section of the cooling oil channel 22 extends along the axial direction of the separating sleeve 25. The spiral-shaped cooling oil channel 22 in the separating sleeve 25 not only prolongs the contact time between the cooling insulating oil and the ultrasonic waves, but also increases the contact area between the cooling insulating oil and the ultrasonic waves through the flat design of the rectangular cross-section. That is, a full-layer oil flow is formed at all points in the cooling oil channel 22, increasing the contact area between the oil and the ultrasonic waves, thereby further improving the bubble removal efficiency.

[0058] Reference Figures 2 to 3 In some embodiments of this utility model, the inlet end 221 and the outlet end 222 of the cooling oil passage 22 both extend along the tangential direction of the cooling oil passage 22, and the inlet end and the outlet end of the cooling oil passage 22 are respectively connected to the oil storage tank 10 and the CT tube 1 through connecting pipes.

[0059] The inlet end 221 of the cooling oil channel 22 is manufactured using precision machining technology, customized according to the parameters of the spiral structure of the cooling oil channel 22. The inlet end 221 is a 50mm long circular tube with an inner diameter consistent with the inner diameter of the cooling oil channel 22, both being 10mm. The extension direction of the inlet end 221 strictly follows the tangent direction at the beginning of the spiral of the cooling oil channel 22, and it is connected to the beginning section of the spiral cooling oil channel 22 through a smooth arc transition with a radius of 15mm. This design can minimize the flow resistance and turbulence of the insulating oil when entering the spiral cooling oil channel 22. Before the actual oil filling operation begins, the insulating oil in the oil storage tank 10 enters the inlet end 221 at a stable flow rate of 5L / min driven by the oil pump. Because the inlet end 221 extends tangentially, the insulating oil can flow smoothly and steadily into the spiral cooling oil channel 22. Its initial flow direction matches the internal flow field direction of the spiral cooling oil channel 22, avoiding energy loss and local pressure fluctuations caused by sudden changes in flow velocity or direction. This ensures the insulating oil maintains a stable flow state before entering the degassing area, creating favorable conditions for subsequent efficient ultrasonic degassing. The outlet end 222 of the cooling oil channel 22 also uses the same precision machining process as the inlet end 221. Its structure is a 60mm long circular tube with an inner diameter of 10mm. The outlet end 222 extends tangentially at the end of the spiral of the cooling oil channel 22 and connects to the subsequent CT tube 1 via a smooth arc transition with a radius of 20mm. After the insulating oil completes ultrasonic degassing, it flows out of the spiral cooling oil channel 22 and into the outlet end 222. Because the outlet end 222 is tangentially positioned, the insulating oil can flow out of the spiral cooling oil channel 22 with a relatively straight flow trajectory, reducing eddies and backflow at the outlet. Actual testing showed that, compared to the traditional structure that does not use a tangentially extended outlet end 222, this outlet end 222 design reduces pressure loss and improves flow rate stability during the outflow process.

[0060] In some embodiments of this invention, a heating layer (not shown in the figure) is embedded in the separating sleeve 25. This heating layer is used to heat the insulating oil in the cooling oil channel 22. The heating layer is a flexible silicone rubber heating film with excellent thermal conductivity, and its thickness is precisely controlled at 2mm. This ensures good heating effect without affecting the overall structure and spatial layout of the separating sleeve 25 due to excessive thickness. The heating film is uniformly and tightly embedded in the middle of the wall thickness of the separating sleeve 25, and is fixed and sealed with high-strength, high-temperature resistant epoxy resin, ensuring no gaps between the heating film and the separating sleeve 25, preventing leakage of insulating oil and heat loss. The size of the heating film is customized according to the external dimensions of the separating sleeve 25, with a length of 480mm and a width of 130mm, completely covering the area where the cooling oil channel 22 is located, to ensure uniform heating of the insulating oil within the cooling oil channel 22. The heating layer is equipped with an intelligent temperature control system, which consists of a temperature sensor, a temperature control chip, and a power adjustment module. The temperature sensor is a high-precision platinum resistance temperature sensor with a measurement accuracy of ±0.1℃. It is installed in the cooling oil channel 22 near the outlet 222 to monitor the temperature of the insulating oil in real time and accurately. The temperature control chip uses a high-performance microcontroller with a built-in preset temperature control program, which can set different target temperature ranges according to the characteristics of different insulating oils in different CT equipment.

[0061] The power adjustment module is connected to the heating film and precisely adjusts the heating power of the heating film according to the instructions of the temperature control chip. The rated power of the heating film is 800W, the power adjustment range is 0 to 800W, and the adjustment accuracy can reach ±10W. During actual operation, the temperature sensor collects the temperature data of the insulating oil in real time and transmits the data to the temperature control chip. The temperature control chip compares and analyzes the collected temperature value with the preset target temperature. If the insulating oil temperature is lower than the lower limit of the target temperature, the temperature control chip sends an instruction to the power adjustment module to increase the heating power of the heating film, so that the insulating oil temperature rises rapidly. When the insulating oil temperature reaches the upper limit of the target temperature, the temperature control chip controls the power adjustment module to reduce the heating power or stop heating to maintain the insulating oil temperature within the set target range. Through actual testing and long-term operation monitoring, the temperature stability of the insulating oil in the oil injection system suitable for CT tubes has been significantly improved after adopting this split sleeve 25 structure with embedded heating layer. During continuous oil filling, the temperature fluctuation range of the insulating oil is always controlled within ±1.5℃, which effectively avoids problems such as increased viscosity and poor fluidity caused by excessively low insulating oil temperature. This ensures that the gas bubbles in the insulating oil are always kept in the optimal state, facilitating the release of gas molecules from the insulating oil.

[0062] Reference Figure 1In some embodiments of this utility model, a pulse valve 11 is provided between the oil storage tank 10 and the ultrasonic gas separation device 20. The pulse valve 11 is located on the connecting pipe between the oil storage tank 10 and the ultrasonic gas separation device 20. This pulse valve 11 is a high-performance, corrosion-resistant electromagnetic pulse valve with a 316L stainless steel body to adapt to the slightly corrosive environment that the insulating oil may present, ensuring long-term stable operation. The interface size of the pulse valve 11 matches the oil outlet of the oil storage tank 10 and the pipe size of the cooling oil channel 22 inlet 221 in the ultrasonic gas separation device 20. A high-precision compression fitting connection is used at the interface, along with an oil-resistant rubber sealing ring to ensure a tight and leak-free connection. The sealing ring is made of fluororubber, which has excellent oil resistance and high-temperature resistance, and can withstand oil temperatures up to 150℃. The pulse valve 11 is equipped with an intelligent control module, which communicates with the control system of the CT detection equipment. This module can precisely control the opening and closing of the pulse valve 11 according to the equipment's operating status, detection tasks, and the required amount of insulating oil. The intelligent control module has a built-in pulse width modulation (PWM) control algorithm, which can flexibly adjust the duration (pulse width) of the pulse valve 11 opening and the interval (pulse period) between two openings.

[0063] During actual oil injection, when the CT detection equipment is started and ready to perform detection, the control system sends an oil injection command to the intelligent control module of the pulse valve 11. According to a preset program, the intelligent control module first sets the pulse width of the pulse valve 11 to 0.5 seconds and the pulse period to 3 seconds, meaning the pulse valve 11 opens for 0.5 seconds every 3 seconds, allowing insulating oil to be injected intermittently from the oil storage tank 10 into the cooling oil channel 22 of the ultrasonic gas separator 20. This intermittent pulse oil injection method has several advantages: Firstly, compared to continuous oil injection, intermittent pulse oil injection reduces the impact force of the insulating oil in the pipeline, reducing pipeline vibration and noise, while avoiding a sudden increase in the processing pressure of the ultrasonic gas separator 20 due to excessive insulating oil flow, ensuring the stability and efficiency of the degassing process; secondly, by precisely controlling the pulse width and period, the amount of insulating oil entering the ultrasonic gas separator 20 can be precisely adjusted, flexibly adjusting the oil injection rate in conjunction with the pulse period of the ultrasonic gas separator 20. During the operation of the CT detection equipment, the intelligent control module also has real-time monitoring and feedback adjustment functions. The flow and pressure data of the insulating oil are collected in real time by flow and pressure sensors installed in the cooling oil channel 22, and the data is transmitted to the intelligent control module. If the insulating oil flow is too high or the pressure rises abnormally, the intelligent control module will automatically reduce the pulse width or increase the pulse period to reduce the oil injection rate; conversely, if the flow is too low or the pressure is insufficient, it will automatically increase the pulse width or decrease the pulse period to increase the oil injection rate, thus maintaining the stable flow of insulating oil in the pipeline and the efficient operation of the ultrasonic gas separator 20. After actual testing and long-term operation verification, the structure with pulse valve 11 has improved the oil injection accuracy of the oil injection system suitable for CT tubes, shortened the degassing time of the insulating oil in the ultrasonic gas separator 20, and effectively avoided problems such as excessive temperature fluctuations in the CT tube 1 and unstable detection image quality caused by unstable oil injection. This significantly improves the overall performance and reliability of the small portable industrial CT inspection equipment, providing a strong guarantee for rapid and accurate detection in industrial fields.

[0064] In some embodiments of this invention, the CT tube 1 is movably mounted on the vacuum negative pressure device 30 via a mounting bracket (not shown in the figure). Specifically, in embodiments of an oil filling system suitable for CT tubes, the CT tube 1 is movably connected to the vacuum negative pressure device 30 via the mounting bracket. The mounting bracket includes a tube clamping mechanism and a support mechanism connected to the vacuum negative pressure device 30. The clamping mechanism is movably mounted on the support mechanism, which can drive the clamping mechanism to move via a drive mechanism, so that the CT tube 1 moves synchronously with the oil filling process. The tube clamping mechanism adopts a double rotary gear drive structure, which drives the clamping mechanism to rotate in opposite directions via a rotating shaft to facilitate clamping or releasing the tube; the clamping surface is covered with a sponge pad to prevent damage to the tube surface. During vacuum treatment, the clamping mechanism fixes the tube with a constant clamping force, while the oil-resistant and negative pressure-resistant pipe is connected to the tube's oil filling hole via a quick connector. To ensure system stability, a three-stage damping structure (not shown in the figure) can be installed at the connection between the mounting bracket and the vacuum negative pressure device: a silicone damping pad is embedded between the mounting plate and the support plate, a spring damper is installed between the fixed plate and the scanning rotating frame, and a memory foam buffer layer is used at the tube clamping part.

[0065] Reference Figure 1 In some embodiments of this utility model, the system further includes an oil replenishment tank 12, which is connected to the oil storage tank 10 via a connecting pipe. The oil replenishment tank 12 can replenish insulating oil to the oil storage tank 10. The oil outlet of the oil replenishment tank 12 is connected to the oil filling port of the oil storage tank 10 via a connecting channel. An oil replenishment solenoid valve is installed on the oil replenishment pipeline between the oil outlet of the oil replenishment tank 12 and the oil filling port of the oil storage tank 10. The oil replenishment solenoid valve can control the opening and closing of the oil replenishment pipeline.

[0066] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. An oil injection system suitable for a CT tube, characterized in that, The application relates to an oil tank, an ultrasonic gas separation device, a vacuum negative pressure device, an oil circulation device and a filter device. The application relates to an oil tank, an ultrasonic gas separation device, a vacuum negative pressure device, an oil circulation device and a filter device. The ultrasonic gas separation device comprises an ultrasonic generator, a cooling oil channel and a negative pressure cavity, the ultrasonic generator is arranged on the cooling oil channel, the ultrasonic generator acts on the insulating oil in the cooling oil channel, one end of the cooling oil channel is communicated with the oil tank through a connecting pipeline, the other end of the cooling oil channel is communicated with the CT tube through a connecting pipeline, a separation membrane is arranged between the negative pressure cavity and the cooling oil channel, the negative pressure cavity is communicated with the negative pressure generator, and the separation membrane allows the gas in the insulating oil to pass through the separation membrane and enter the negative pressure cavity from the cooling oil channel. The separation membrane is a polytetrafluoroethylene film. The ultrasonic gas separation device comprises: a separation pipe sleeve, an inner side wall of the separation pipe sleeve is provided with the cooling oil channel, the cooling oil channel is arranged in a spiral groove, and the ultrasonic generator is arranged in an annular mode on an outer side wall of the separation pipe sleeve; and a fixing cylinder, the fixing cylinder is arranged in the separation pipe sleeve, the separation membrane is arranged between the fixing cylinder and the inner side wall of the separation pipe sleeve, the negative pressure cavity is arranged in the center of the fixing cylinder, and the fixing cylinder is provided with a communication hole, the communication hole communicates the negative pressure cavity and the gas in the cooling oil channel which can pass through the separation membrane and enter the negative pressure cavity in the fixing cylinder.

2. The oil injection system for CT tube according to claim 1, wherein The cross section of the cooling oil channel is in a flat rectangular shape, and the length direction of the cross section of the cooling oil channel extends along the axial direction of the separation pipe sleeve.

3. The oil injection system for CT tube according to claim 2, wherein The liquid inlet end and the liquid outlet end of the cooling oil channel extend along the tangent direction of the cooling oil channel, and the liquid inlet end and the liquid outlet end of the cooling oil channel are respectively connected with the oil tank and the CT tube through connecting pipelines.

4. The oil injection system for CT tube according to claim 2, wherein A heating layer is embedded in the separation pipe sleeve, and the heating layer is used for heating the insulating oil in the cooling oil channel. A pulse valve is arranged between the oil tank and the ultrasonic gas separation device, and the pulse valve is arranged on the connecting pipeline between the oil tank and the ultrasonic gas separation device. ​ 5. The oil filling system for CT tube according to claim 4, wherein, ​ 6. The oil filling system for CT tube according to claim 4, wherein, ​ 7. The oil filling system for CT tube according to claim 4, wherein, ​ 8. The oil filling system for CT tube according to claim 1, wherein, ​ 9. The oil filling system for CT tube according to claim 1, wherein, The CT tube is movably arranged on the vacuum negative pressure device through a mounting frame.

10. The oil filling system for CT tube according to claim 1, wherein, The oil supplementing tank is connected with the oil storage tank through a communication pipeline, and can supplement insulating oil to the oil storage tank.

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