Complex flow channel negative pressure type ultrasonic cleaning equipment and cleaning method

Abstract

The invention relates to the field of cleaning equipment, and discloses complex flow channel negative pressure type ultrasonic cleaning equipment and a cleaning method.The complex flow channel negative pressure type ultrasonic cleaning equipment comprises a vacuum cleaning tank, an ultrasonic cleaning device and an ultrasonic cleaning device, the ultrasonic vibrator is mounted on the outer wall of the vacuum cleaning tank; the vacuum pump system is connected with the vacuum cleaning tank and used for establishing a negative pressure environment in the tank; the cleaning nozzle is arranged in the vacuum cleaning tank, and the spraying end of the cleaning nozzle is positioned at the inlet of the workpiece runner; the gas supply channel penetrates through the side wall of the vacuum cleaning tank; the outlet end of the gas supply channel is communicated to the cleaning nozzle. According to the titanium alloy powder cleaning device, a gas-liquid mixture is driven by negative pressure to be sprayed at a high speed through the cleaning nozzle, the fluid pressure is increased through the Venturi mixing unit, the high-temperature gas-liquid mixture penetrates through a flow channel with strong impact force, powder impurities on the inner wall are deeply scoured, sticky matter formed by titanium alloy powder, cutting fluid and grease is melted, and the impurity removing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of cleaning equipment, and in particular to a complex flow channel negative pressure ultrasonic cleaning equipment and a cleaning method. Background Art

[0002] Ultrasonic cleaning technology, due to its efficient, non-contact cleaning capabilities, has become a key process in the post-processing of titanium alloy workpieces. This technology uses a piezoelectric transducer to convert high-frequency electrical energy into mechanical vibrations, inducing cavitation in the cleaning fluid. This generates transient high-pressure shock waves and microjets, physically stripping contaminants from the workpiece surface. Conventional ultrasonic equipment can effectively remove over 90% of loose powder and light oil contamination, and its standardized cleaning process has been integrated into mainstream production lines.

[0003] A search of the publication number CN108127116B discloses a method for cleaning the internal flow channels of a 3D printed cold plate. The method first uses mechanical vibration and vacuum suction to remove powder, then uses kerosene to flush, blows dry with a high-pressure air gun, and further cleans the workpiece by ultrasonic cleaning after machining, and finally uses high-pressure water to flush.

[0004] However, faced with the need to clean complex flow channels inside special-shaped titanium alloy workpieces (such as multi-level blind holes and micro-cross channels), existing cleaning equipment is unable to effectively remove powder and impurities in the flow channels inside the workpieces. The cavitation effect of ultrasound causes energy attenuation due to shielding of the flow channel structure, and is unable to effectively peel off and remove powder and impurities, restricting the mass production qualification rate of high-reliability workpieces. Summary of the Invention

[0005] In order to solve the problem that the above-mentioned cleaning equipment cannot effectively remove powder and impurities in the internal flow channel of the workpiece, the cavitation effect of the ultrasonic wave causes energy attenuation due to the shielding of the flow channel structure, and cannot effectively peel off and remove powder and impurities, thereby restricting the mass production qualification rate of high-reliability workpieces, the present invention is achieved through the following technical solution.

[0006] In one aspect, the present invention provides a complex flow channel negative pressure ultrasonic cleaning device, comprising:

[0007] A vacuum cleaning tank with a sealable and closable tank cover on the top;

[0008] An ultrasonic vibrator is installed on the outer wall of the vacuum cleaning tank;

[0009] A vacuum pump system connected to the vacuum cleaning tank to create a negative pressure environment in the tank;

[0010] A cleaning nozzle is arranged in the vacuum cleaning tank, with its spray end positioned at the inlet of the workpiece flow channel;

[0011] A gas supply channel running through the side wall of the vacuum cleaning tank, the outlet end of which is connected to the cleaning nozzle;

[0012] a liquid supply channel coaxially disposed within the gas supply channel, the outlet end of the liquid supply channel extending into the cleaning nozzle;

[0013] Among them, when the vacuum pump system is evacuating:

[0014] The cleaning nozzle sprays gas and liquid into the flow channel inlet under negative pressure drive;

[0015] The gas and liquid spray penetrate the flow channel and are discharged from the flow channel outlet, carrying powder and impurities away from the workpiece.

[0016] Preferably, the cleaning nozzle is provided with:

[0017] The venturi mixing unit comprises a mixing chamber, a throat and a diffusion port which are connected in sequence;

[0018] The outlets of the gas supply channel and the liquid supply channel meet in the mixing chamber;

[0019] The cross-sectional area of ​​the throat is smaller than the cross-sectional area of ​​the mixing chamber, so that the fluid pressure is increased and then ejected through the diffuser.

[0020] Preferably, the cleaning nozzle comprises:

[0021] An annular airbag coaxially sleeved on the outer edge of the diffuser;

[0022] an air storage chamber connected to the air bag through an inflation tube;

[0023] The air storage chamber is pre-filled with 0.15-0.8MPa inert gas. When the vacuum pump system is evacuated, the pressure difference drives the gas in the air storage chamber to be injected into the airbag to expand and form a dynamic seal at the flow channel entrance.

[0024] Preferably, the air storage chamber comprises:

[0025] The piston is installed in the air storage chamber. When the vacuum pump system evacuates the cleaning tank so that the pressure is lower than the pressure in the air storage chamber, the pressure difference drives the piston to move in the air storage chamber.

[0026] An elastic member, one end of which is mounted on the piston and the other end of which is mounted on the inner wall of the air storage chamber;

[0027] The distance sensor is installed on the inner wall of the air storage chamber, and is used to detect the moving distance of the piston.

[0028] Preferably, the cleaning nozzle further comprises:

[0029] a valve plate, mounted in the mixing chamber;

[0030] A gear is installed in the air storage chamber, and the valve plate is connected to the gear through a valve stem;

[0031] A moving plate is installed at one end of the piston, and a rack is installed on the moving plate. When the piston moves, the rack on the moving plate is driven to engage with the gear.

[0032] Preferably, the gas supply channel includes:

[0033] a delivery pipe, installed on the gas supply channel, for delivering gas to the gas supply channel;

[0034] The first automatic control valve is installed on the delivery pipe.

[0035] Preferably, the liquid supply channel includes:

[0036] a second automatic control valve installed in the liquid supply channel;

[0037] A water pump is installed on the outer wall of the vacuum cleaning tank, and the water outlet of the water pump is connected to the liquid supply channel;

[0038] The heater is installed on the outer wall of the vacuum cleaning tank, and the delivery pipe and the liquid supply channel are both connected to the heater.

[0039] Preferably, the vacuum cleaning tank comprises:

[0040] There are two linear slide rails, which are symmetrically arranged on the top of the vacuum cleaning tank, and the tank cover is arranged between the two linear slide rails;

[0041] Place the rack and install it in the vacuum cleaning tank.

[0042] Preferably, a support tube is installed on the inner wall of the vacuum cleaning tank, one end of the support tube is connected to the cleaning nozzle, and a gas supply channel is provided through the support tube.

[0043] On the other hand, the present invention also provides a complex flow channel negative pressure ultrasonic cleaning method, comprising the following steps:

[0044] S1. Establishment of negative pressure environment and dynamic sealing:

[0045] Close the tank cover on the top of the vacuum cleaning tank and start the vacuum pump system to evacuate the tank to a pressure of 10-50kPa;

[0046] Negative pressure triggers the water injection pipe to inject water into the tank, and at the same time drives the pre-charged gas in the air storage chamber to be injected into the annular airbag through the inflation pipe, causing it to expand and seal the workpiece flow channel entrance;

[0047] S2. Gas-liquid linkage control:

[0048] The pressure difference drives the piston to move, and the piston drives the moving plate and the rack to move. Through the meshing of the rack and the gear, the gear drives the valve stem and the valve plate to rotate, which can open the mixing chamber;

[0049] After the distance sensor detects that the piston displacement reaches a preset value, the first automatic control valve of the gas supply channel and the second automatic control valve of the liquid supply channel are opened;

[0050] S3. High temperature gas-liquid penetration cleaning:

[0051] After the gas and liquid are heated to 65±5℃ by the heater, they meet in the mixing chamber;

[0052] The fluid is pressurized 1.8-2.5 times through the throat and sprayed into the flow channel inlet from the diffuser;

[0053] The high-temperature gas-liquid jet penetrates the interior of the flow channel, melts and washes away the viscous mixture of titanium alloy powder and grease, and discharges it from the outlet carrying impurities;

[0054] S4. Ultrasound synergistic enhancement:

[0055] Start the ultrasonic vibrator to stimulate the cavitation effect in the liquid medium, causing the remaining impurities to fall off from the flow channel wall;

[0056] S5. Shutdown:

[0057] Close the first automatic control valve, the second automatic control valve, the vacuum pump system and the ultrasonic vibrator in sequence, open the slot cover and take out the workpiece.

[0058] The present invention provides a complex flow channel negative pressure ultrasonic cleaning device and cleaning method. Compared with the existing technology, it has the following advantages:

[0059] This solution uses negative pressure to drive the gas-liquid mixture to spray at high speed through the cleaning nozzle. The Venturi mixing unit increases the fluid pressure, allowing the high-temperature gas-liquid mixture to penetrate the flow channel with strong impact force, deeply flushing the powder impurities on the inner wall, and melting the titanium alloy powder and cutting fluid and grease to form a viscous substance, thereby improving the impurity removal efficiency.

[0060] Through the design of the gas storage chamber and the annular airbag, when the vacuum pump is evacuated, the pressure difference drives the inert gas pre-filled in the gas storage chamber to be injected into the airbag, causing it to expand and form a dynamic seal, effectively preventing the gas-liquid mixture from leaking from the flow channel inlet. The dynamic sealing mechanism not only ensures pressure stability during the cleaning process, but also maintains the impact force of the gas-liquid injection;

[0061] By setting an ultrasonic vibrator on the outer wall of the vacuum cleaning tank and combining the synergistic effect of the negative pressure environment and gas-liquid injection, when the ultrasonic wave propagates in the liquid medium, the tiny bubbles generated by cavitation collapse to generate a strong impact force, which continuously acts on the inner wall of the flow channel, enhancing the ability to strip and remove impurities, ensuring that impurities in all parts of the flow channel can fall off and be discharged with the gas-liquid mixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 This is a schematic diagram of the three-dimensional structure proposed by the present invention.

[0063] Figure 2 This is a schematic diagram of a three-dimensional structure from another perspective proposed by the present invention.

[0064] Figure 3 This is a schematic cross-sectional view of the vacuum cleaning tank proposed in the present invention.

[0065] Figure 4 This is a schematic diagram of the cleaning nozzle, air nozzle, liquid nozzle and support tube structure proposed in the present invention.

[0066] Figure 5 This is a schematic structural diagram of the cleaning nozzle, heater, first automatic control valve and second automatic control valve proposed in the present invention.

[0067] Figure 6 This is a schematic cross-sectional view of the cleaning nozzle proposed in the present invention.

[0068] Figure 7 This is a cross-sectional schematic diagram of the cleaning nozzle, air nozzle and liquid nozzle proposed in the present invention.

[0069] Figure 8 This is an enlarged partial cross-sectional view of the cleaning nozzle proposed in the present invention.

[0070] Figure 9 This is a schematic cross-sectional view of the cleaning nozzle and airbag proposed in the present invention.

[0071] The reference numerals in the figures are:

[0072] 100. Vacuum cleaning tank; 101. Linear guide rail; 102. Tank cover; 103. Storage rack;

[0073] 200, ultrasonic vibrator;

[0074] 300. Vacuum pump system;

[0075] 400, cleaning nozzle; 401, air bag; 402, air storage chamber; 403, piston; 404, inflation tube; 405, mixing chamber; 406, throat; 407, diffuser; 408, valve plate; 409, gear; 410, movable plate; 411, rack; 412, distance sensor; 413, elastic member;

[0076] 500, gas supply channel; 501, liquid supply channel; 502, delivery pipe; 503, heater; 504, first automatic control valve; 505, second automatic control valve; 506, support pipe. DETAILED DESCRIPTION

[0077] The present invention is further described below with reference to specific examples. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of protection of the present invention.

[0078] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention.

[0079] Example 1: Reference Figures 1-9 A complex flow channel negative pressure ultrasonic cleaning equipment includes a vacuum cleaning tank 100, an ultrasonic vibrator 200, a vacuum pump system 300, a cleaning nozzle 400, a gas supply channel 500 and a liquid supply channel 501. The top of the vacuum cleaning tank 100 is provided with a sealable tank cover 102 to provide a closed space for forming a negative pressure environment; the ultrasonic vibrator 200 is installed on the outer wall of the vacuum cleaning tank 100, and generates ultrasonic waves to induce cavitation in the liquid medium, thereby enhancing the cleaning ability of impurities; the vacuum pump system 300 is connected to the vacuum cleaning tank 100 to establish a negative pressure environment in the tank. The negative pressure environment is the key power source for driving the injection of the gas-liquid mixture and achieving efficient cleaning.

[0080] The cleaning nozzle 400 is disposed within the vacuum cleaning tank 100, with its spray tip positioned at the workpiece flow channel entrance. It is the core component for achieving the cleaning function. A gas supply channel 500 runs through the sidewall of the vacuum cleaning tank 100, with its outlet connected to the cleaning nozzle 400 for conveying gas. A liquid supply channel 501 is coaxially disposed within the gas supply channel 500, with its outlet extending into the cleaning nozzle 400 for conveying liquid. When the vacuum pump system 300 is evacuated, the cleaning nozzle 400, driven by negative pressure, sprays gas and liquid into the flow channel entrance. The gas and liquid jets penetrate the interior of the flow channel and are discharged from the flow channel outlet, carrying powder impurities away from the workpiece.

[0081] The cleaning nozzle 400 is provided with a Venturi mixing unit, comprising a mixing chamber 405, a throat 406 and a diffuser 407, which are connected in sequence. The outlets of the gas supply channel 500 and the liquid supply channel 501 converge at the mixing chamber 405, where the gas and liquid are initially mixed. The cross-sectional area of ​​the throat 406 is reduced to 30-50% of the mixing chamber 405. According to the principles of fluid mechanics, when the fluid flows through the throat 406 with a smaller cross-sectional area, the flow rate will increase and the pressure will decrease. The subsequent diffuser 407 will further reduce the flow rate and increase the pressure, thereby increasing the fluid pressure by 1.8-2.5 times before being ejected through the diffuser 407. This design enables the gas-liquid mixture to be sprayed into the flow channel at high speed and high pressure, enhancing the impact and flushing ability on impurities.

[0082] The cleaning nozzle 400 also includes an airbag 401 and an air storage chamber 402 connected to the airbag 401 via an air filling tube 404. The air storage chamber 402 is pre-filled with 0.15-0.8 MPa of inert gas. When the vacuum pump system 300 is evacuated, because the pressure in the cleaning tank is lower than that in the air storage chamber 402, the pressure difference drives the gas in the air storage chamber 402 into the airbag 401, causing it to expand. This forms a dynamic seal at the entrance of the workpiece flow channel, effectively preventing the gas-liquid mixture from leaking from the entrance, ensuring pressure stability and cleaning effectiveness during the cleaning process. The use of inert gas also avoids chemical reactions with the cleaning fluid or the workpiece.

[0083] A piston 403, an elastic member 413, and a distance sensor 412 are provided within the air storage chamber 402. The elastic member 413 is a spring, or an elastic band. The piston 403 is mounted within the air storage chamber 402. When the vacuum pump system 300 evacuates the cleaning tank, causing the pressure within the cleaning tank to fall below that within the air storage chamber 402, the pressure differential drives the piston 403 to move within the air storage chamber 402. The elastic member 413 has one end mounted on the piston 403 and the other end mounted on the inner wall of the air storage chamber 402. Its function is to assist in resetting the piston 403 when the pressure returns to equilibrium after cleaning. The distance sensor 412, mounted on the inner wall of the air storage chamber 402, is used to detect the distance moved by the piston 403, thereby determining whether a preset state has been reached and thereby controlling subsequent operations such as gas and liquid injection.

[0084] The cleaning nozzle 400 further includes:

[0085] The valve plate 408, gear 409, valve stem, and movable plate 410 are mounted on a rack 411. The valve plate 408 is mounted in the mixing chamber 405, and the gear 409 is mounted in the gas storage chamber 402. The valve plate 408 is connected to the gear 409 via the valve stem. The movable plate 410 is mounted on one end of the piston 403, and the rack 411 is mounted on the movable plate 410. When the piston 403 moves, it drives the rack 411 on the movable plate 410 to engage with the gear 409. The gear 409 transmits the power, causing the valve stem to control the opening or closing of the valve plate 408 in the mixing chamber 405, thus achieving precise control of the gas-liquid mixing process and ensuring that the gas-liquid jet cleaning is carried out at the appropriate time.

[0086] The gas supply channel 500 includes a delivery pipe 502 and a first automatic control valve 504. The delivery pipe 502 is used to deliver gas to the gas supply channel 500. The first automatic control valve 504 is installed on the delivery pipe 502 and can control the on-off and flow rate of the gas as needed; the liquid supply channel 501 includes a second automatic control valve 505, a water pump and a heater 503. The second automatic control valve 505 is installed in the liquid supply channel 501 and is used to control the on-off of the liquid; the water pump is installed on the outer wall of the vacuum cleaning tank 100, and its water outlet is connected to the liquid supply channel 501 to provide power for liquid delivery; the heater 503 is installed on the outer wall of the vacuum cleaning tank 100, and the delivery pipe 502 and the liquid supply channel 501 are both connected to the heater 503 to heat the gas and liquid to a suitable temperature (such as 65±5°C). The high-temperature gas-liquid mixture can melt the viscous substance formed by the mixture of titanium alloy powder attached to the flow channel wall and cutting fluid and grease, further improving the cleaning effect.

[0087] The vacuum cleaning tank 100 includes two linear guide rails 101 and a placement rack 103. Two linear guide rails 101 are symmetrically arranged at the top of the vacuum cleaning tank 100, and a tank cover 102 is positioned between the two linear guide rails 101 to facilitate opening and closing of the tank cover 102. The placement rack 103 is installed within the vacuum cleaning tank 100 and is used to place workpieces to be cleaned. Furthermore, a support tube 506 is installed on the inner wall of the vacuum cleaning tank 100. One end of the support tube 506 is connected to the cleaning nozzle 400, and a gas supply channel 500 is provided through the support tube 506. The support tube 506 serves to secure and support the cleaning nozzle 400, ensuring its stable operation.

[0088] In this embodiment, the linear guide rail 101 adopts the ABBA guide rail produced by Taiwan Linear Technology Co., Ltd., model BRH20A;

[0089] The vacuum pump system 300 uses a 2XZ-1 rotary vane vacuum pump manufactured by Wuhan Glemo Testing Equipment Co., Ltd.

[0090] The heater 503 is an electromagnetic induction heater 503 or a far infrared electric heater 503;

[0091] The distance sensor 412 is a laser distance sensor 412 or an infrared distance sensor 412;

[0092] The first automatic control valve 504 and the second automatic control valve 505 are electromagnetic automatic control valves.

[0093] This embodiment combines gas cleaning and liquid cleaning. Under a negative pressure environment, the gas supply channel 500 and the liquid supply channel 501 are used to transport gas and liquid respectively, and they intersect in the mixing chamber 405 of the cleaning nozzle 400. The pressure of the gas-liquid mixture is increased by the Venturi mixing unit, so that it is sprayed into the flow channel at high speed. The high-temperature gas-liquid mixture can not only impact and flush impurities, but also melt viscous substances. Combined with the cavitation effect of the ultrasonic vibrator 200, efficient and thorough cleaning of complex flow channels can be achieved, ensuring the sealing of the flow channel inlet and precise control of the cleaning process.

[0094] Example 2: This example has a similar overall equipment structure to that of Example 1, with the main difference being that only a gas supply channel 500 is provided, and a liquid supply channel 501 is not included. It includes a vacuum cleaning tank 100, an ultrasonic vibrator 200, a vacuum pump system 300, a cleaning nozzle 400, and a gas supply channel 500. The top of the vacuum cleaning tank 100 is provided with a sealable tank cover 102 for forming a closed space to establish a negative pressure environment; the ultrasonic vibrator 200 is installed on the outer wall of the vacuum cleaning tank 100 and can generate ultrasonic waves, and utilizes the cavitation effect induced by ultrasonic waves in the liquid medium to assist cleaning; the vacuum pump system 300 is connected to the vacuum cleaning tank 100 and is the core component for establishing a negative pressure environment in the tank, providing power for the cleaning process.

[0095] The cleaning nozzle 400 is arranged in the vacuum cleaning tank 100, and its injection end is precisely positioned at the entrance of the workpiece flow channel, and plays the key role of spraying gas into the flow channel. The gas supply channel 500 runs through the side wall of the vacuum cleaning tank 100, and the outlet end is directly connected to the cleaning nozzle 400. A delivery pipe 502 and a first automatic control valve 504 are installed on the channel. The delivery pipe 502 is used to deliver gas, and the first automatic control valve 504 can control the on-off and flow of the gas as needed.

[0096] Based on the principle of negative pressure, the vacuum pump system 300 creates a negative pressure within the vacuum cleaning tank 100. This pressure differential forces gas into the cleaning nozzle 400 through the gas supply channel 500. The Venturi mixing unit boosts the gas pressure, allowing it to be ejected at high speed into the flow channel, impact-removing impurities. The coordination of the gas storage chamber 402, airbag 401, and piston 403 achieves dynamic sealing of the flow channel entrance and air path control. Ultrasonic waves generated by the ultrasonic transducer 200 enhance the cleaning effect.

[0097] Example 3: This example is similar in structure to Example 1, with the main difference being that only a liquid supply channel 501 is provided, and no gas supply channel 500 is included. The structure and function of the vacuum cleaning tank 100, ultrasonic vibrator 200, vacuum pump system 300, and cleaning nozzle 400 are consistent with those of Example 1. The liquid supply channel 501 is coaxially arranged at the original location of the gas supply channel 500, with one end connected to a water pump or a cleaning liquid storage container and the other end extending into the cleaning nozzle 400. A second automatic control valve 505 is installed in the liquid supply channel 501 to control the flow of liquid. The water pump is installed on the outer wall of the vacuum cleaning tank 100, and its outlet is connected to the liquid supply channel 501 to provide power for liquid transportation. At the same time, a heater 503 can be provided as needed to heat the liquid to enhance the cleaning effect.

[0098] A negative pressure environment is established in the vacuum cleaning tank 100 by the vacuum pump system 300, and a water pump is used to provide power. Under the combined action of the pressure difference and the water pump power, the liquid enters the cleaning nozzle 400 through the liquid supply channel 501. The Venturi mixing unit increases the liquid pressure, causing it to be ejected at high speed into the flow channel for cleaning. The cavitation effect of the ultrasonic vibrator 200 further enhances the cleaning effect.

[0099] Example 4: A complex flow channel negative pressure ultrasonic cleaning method, comprising the following steps:

[0100] Close the sealable tank cover 102 on the top of the vacuum cleaning tank 100, start the vacuum pump system 300, and perform a vacuum operation on the inside of the vacuum cleaning tank 100 to gradually reduce the air pressure in the tank to form a negative pressure environment. During this process, the water injection pipe at the bottom of the vacuum cleaning tank 100 is opened. Under the action of negative pressure, the water in the water injection pipe is injected into the cleaning tank. The pressure in the air storage chamber 402 is higher than the pressure in the vacuum cleaning tank 100. The gas in the air storage chamber 402 is injected into the air bag 401 through the inflation tube 404, causing it to expand, forming a dynamic seal at the entrance of the workpiece flow channel to prevent the gas-liquid mixture from leaking from the entrance, thereby ensuring the cleaning effect. At the same time, the pressure difference drives the piston 403 to move in the air storage chamber 402, and the piston 403 drives the rack 411 on the movable plate 410 to engage with the gear 409, and controls the valve plate 408 in the mixing chamber 405 to open through the valve stem, preparing for subsequent gas-liquid injection.

[0101] The distance sensor 412 detects the moving distance of the piston 403. When the preset value is reached, the first automatic control valve 504 on the gas supply channel 500 delivery pipe 502 is opened to allow the gas to enter the cleaning nozzle 400 through the gas supply channel 500; at the same time, the water pump is started, and the second automatic control valve 505 in the liquid supply channel 501 is opened to allow the liquid to flow into the cleaning nozzle 400 through the liquid supply channel 501. The heater 503 heats the gas and liquid to 65±5℃. After heating, the gas and liquid meet in the mixing chamber 405 of the cleaning nozzle 400.

[0102] By utilizing the Venturi mixing unit of the cleaning nozzle 400, the cross-sectional area of ​​the throat 406 is reduced to 30-50% of the mixing chamber 405, so that the pressure of the fluid after intersection is increased by 1.8-2.5 times, and then it is sprayed into the workpiece flow channel inlet through the diffuser 407 in a high-speed jet state. Driven by negative pressure, the high-temperature gas-liquid mixture penetrates the interior of the flow channel, impacting and flushing the powder impurities on the inner wall of the complex flow channel, and can melt the viscous substance formed by the mixture of titanium alloy powder and cutting fluid and grease attached to the flow channel wall, and discharge the powder impurities from the flow channel outlet.

[0103] The ultrasonic vibrator 200 installed on the outer wall of the vacuum cleaning tank 100 is activated to generate ultrasonic waves. The ultrasonic waves propagate in the liquid medium in the vacuum cleaning tank 100, further enhancing the cleaning ability of impurities in the complex flow channel. Through cavitation, the impurities are removed from the flow channel wall and discharged with the gas-liquid mixture.

[0104] First, close the first automatic control valve 504 of the gas supply channel 500 and the second automatic control valve 505 of the liquid supply channel 501 to stop the gas and liquid supply; then turn off the vacuum pump system 300, open the tank cover 102 of the vacuum cleaning tank 100, and take out the cleaned workpiece.

[0105] In summary, compared with the existing technology, it has the following beneficial effects:

[0106] This solution uses negative pressure to drive the gas-liquid mixture to spray at high speed through the cleaning nozzle 400. The Venturi mixing unit increases the fluid pressure, allowing the high-temperature gas-liquid mixture to penetrate the flow channel with strong impact force, deeply flushing the powder impurities on the inner wall, and melting the viscous substance formed by the titanium alloy powder and cutting fluid and grease, thereby improving the impurity removal efficiency.

[0107] Through the design of the air storage chamber 402 and the annular airbag 401, when the vacuum pump is evacuated, the pressure difference drives the pre-filled inert gas in the air storage chamber 402 to be injected into the airbag 401, causing it to expand and form a dynamic seal, effectively preventing the gas-liquid mixture from leaking from the flow channel inlet. The dynamic sealing mechanism not only ensures pressure stability during the cleaning process, but also maintains the impact force of the gas-liquid injection.

[0108] By arranging an ultrasonic vibrator on the outer wall of the vacuum cleaning tank 100 and combining the synergistic effect of the negative pressure environment and the gas-liquid injection, when the ultrasonic wave propagates in the liquid medium, the tiny bubbles generated by cavitation collapse to generate a strong impact force, which continuously acts on the inner wall of the flow channel, thereby enhancing the ability to strip and remove impurities, ensuring that impurities in all parts of the flow channel can fall off and be discharged with the gas-liquid mixture.

[0109] The distance sensor 412 monitors the movement distance of the piston 403 in real time and accurately controls the timing of gas-liquid injection. The automatic control valve can flexibly adjust the gas and liquid flow. The piston 403 drives the rack 411 to engage with the gear 409, accurately controlling the opening of the valve plate 408 to achieve precise regulation of gas-liquid mixing. The precise control capability enables the equipment to adapt to the complex flow channel cleaning needs of special-shaped titanium alloy workpieces of different specifications.

[0110] Thus, although the invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are contemplated within the foregoing disclosure, and it should be understood that in some cases, some features of the invention will be employed without the corresponding use of other features without departing from the scope and spirit of the claimed invention. Thus, many modifications may be made to adapt a particular environment or material to the true scope and spirit of the invention. The invention is not intended to be limited to the specific terminology used in the claims below and / or to the specific embodiments disclosed as the best mode contemplated for carrying out the invention, but the invention is intended to include any and all embodiments and equivalents falling within the scope of the appended claims. Thus, the scope of the invention will be determined solely by the appended claims.

Claims

1. A complex flow channel negative pressure ultrasonic cleaning device, comprising a vacuum cleaning tank (100), the top of which is provided with a tank cover (102) that can be sealed and opened and closed, characterized in that: Also includes: An ultrasonic vibrator (200) is installed on the outer wall of the vacuum cleaning tank (100); A vacuum pump system (300) connected to the vacuum cleaning tank (100) is used to establish a negative pressure environment in the tank; A cleaning nozzle (400) is disposed in the vacuum cleaning tank (100), with its spray end positioned at the inlet of the workpiece flow channel; A gas supply channel (500) running through the side wall of the vacuum cleaning tank (100), the outlet end of which is connected to the cleaning nozzle (400); a liquid supply channel (501) coaxially arranged in the gas supply channel (500), the outlet end of which extends into the cleaning nozzle (400); When the vacuum pump system (300) is evacuated: The cleaning nozzle (400) sprays gas and liquid into the flow channel inlet under negative pressure driving; The gas and liquid spray penetrate the flow channel and are discharged from the flow channel outlet, carrying powder and impurities away from the workpiece.

2. The complex flow channel negative pressure ultrasonic cleaning equipment according to claim 1, characterized in that: The cleaning nozzle (400) is provided with: The venturi mixing unit comprises a mixing chamber (405), a throat (406) and a diffusion port (407) which are connected in sequence; The outlets of the gas supply channel (500) and the liquid supply channel (501) meet in the mixing chamber (405); The cross-sectional area of ​​the throat (406) is smaller than the cross-sectional area of ​​the mixing chamber (405), so that the fluid pressure is increased and then ejected through the diffusion port (407).

3. The complex flow channel negative pressure ultrasonic cleaning equipment according to claim 2, characterized in that: The cleaning nozzle (400) comprises: an annular air bag (401) coaxially sleeved on the outer edge of the diffuser (407); An air storage chamber (402) communicated with the air bag (401) via an air inflation tube (404); The gas storage chamber (402) is pre-filled with 0.15-0.8 MPa inert gas. When the vacuum pump system (300) is evacuated, the pressure difference drives the gas in the gas storage chamber (402) to be injected into the air bag (401) to expand and form a dynamic seal at the flow channel entrance.

4. The complex flow channel negative pressure ultrasonic cleaning equipment according to claim 3, characterized in that: The air storage chamber (402) comprises: The piston (403) is installed in the air storage chamber (402). When the vacuum pump system (300) evacuates the air so that the pressure in the cleaning tank is lower than the pressure in the air storage chamber (402), the pressure difference drives the piston (403) to move in the air storage chamber (402). An elastic member (413), one end of which is mounted on the piston (403) and the other end of which is mounted on the inner wall of the air storage chamber (402); The distance sensor (412) is installed on the inner wall of the air storage chamber (402). The distance sensor (412) is used to detect the moving distance of the piston (403).

5. The complex flow channel negative pressure ultrasonic cleaning equipment according to claim 4, characterized in that: The cleaning nozzle (400) further comprises: a valve plate (408) mounted in the mixing chamber (405); A gear (409) is installed in the air storage chamber (402), and a valve plate (408) is connected to the gear (409) via a valve stem; A movable plate (410) is installed at one end of the piston (403), and a rack (411) is installed on the movable plate (410). When the piston (403) moves, the rack (411) on the movable plate (410) is driven to engage with the gear (409).

6. The complex flow channel negative pressure ultrasonic cleaning equipment according to claim 1, characterized in that: The gas supply channel (500) comprises: a delivery pipe (502), installed on the gas supply channel (500), for delivering gas to the gas supply channel (500); The first automatic control valve (504) is installed on the delivery pipe (502).

7. The complex flow channel negative pressure ultrasonic cleaning equipment according to claim 6, characterized in that: The liquid supply channel (501) comprises: A second automatic control valve (505) is installed in the liquid supply channel (501); A water pump is installed on the outer wall of the vacuum cleaning tank (100), and the water outlet of the water pump is connected to the liquid supply channel (501); The heater (503) is installed on the outer wall of the vacuum cleaning tank (100), and the delivery pipe (502) and the liquid supply channel (501) are both connected to the heater (503).

8. The complex flow channel negative pressure ultrasonic cleaning equipment according to claim 1, characterized in that: The vacuum cleaning tank (100) comprises: There are two linear slide rails (101) symmetrically arranged on the top of the vacuum cleaning tank (100), and a tank cover (102) is arranged between the two linear slide rails (101); The placement rack (103) is installed in the vacuum cleaning tank (100).

9. The complex flow channel negative pressure ultrasonic cleaning equipment according to claim 1, characterized in that: A support tube (506) is installed on the inner wall of the vacuum cleaning tank (100), one end of the support tube (506) is connected to the cleaning nozzle (400), and a gas supply channel (500) is provided through the support tube (506).

10. The cleaning method of the complex flow channel negative pressure ultrasonic cleaning equipment according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Establishment of negative pressure environment and dynamic sealing: Close the tank cover (102) on the top of the vacuum cleaning tank (100), start the vacuum pump system (300) to evacuate the tank to a pressure of 10-50 kPa; Negative pressure triggers the water injection pipe to inject water into the tank, and at the same time drives the pre-charged gas in the gas storage chamber (402) to be injected into the annular airbag (401) through the gas charging pipe (404), causing it to expand and seal the workpiece flow channel entrance; S2. Gas-liquid linkage control: The pressure difference drives the piston (403) to move, and the piston (403) drives the moving plate (410) and the rack (411) to move. The rack (411) and the gear (409) are engaged, and the gear (409) drives the valve stem and the valve plate (408) to rotate, thereby opening the mixing chamber (405); After the distance sensor (412) detects that the displacement of the piston (403) reaches a preset value, the first automatic control valve (504) of the gas supply channel (500) and the second automatic control valve (505) of the liquid supply channel (501) are opened; S3. High temperature gas-liquid penetration cleaning: The gas and liquid are heated to 65±5°C by the heater (503) and then meet in the mixing chamber (405); The fluid is pressurized through the throat (406) and sprayed into the flow channel inlet from the diffuser (407); The high-temperature gas-liquid jet penetrates the interior of the flow channel, melts and washes away the viscous mixture of titanium alloy powder and grease, and discharges it from the outlet carrying impurities; S4. Ultrasound synergistic enhancement: activating the ultrasonic vibrator (200) to stimulate a cavitation effect in the liquid medium, causing residual impurities to fall off the flow channel wall; S5. Shutdown: The first automatic control valve (504), the second automatic control valve (505), the vacuum pump system (300) and the ultrasonic vibrator (200) are closed in sequence, and the tank cover (102) is opened to remove the workpiece.

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