A sputum suction device that can automatically compensate for airflow

Abstract

This invention discloses a sputum suction device with automatic airflow compensation, comprising a housing and a high-frequency oscillator, a blower, and an exhaust platform disposed within the housing. The high-frequency oscillator has an air inlet protruding from the lower front end, with an air inlet hole in the center and a supplementary air hole communicating with the air inlet hole on its outer periphery. The exhaust platform has an air intake channel at one end communicating with the air inlet hole, and the other end communicating with the blower's air outlet. A flow booster is inserted into the air inlet hole, comprising a mixing pipe and a nozzle pipe, forming a mixing chamber communicating with the supplementary air hole between the mixing pipe and the nozzle pipe. A Laval nozzle protrudes from the inner end of the nozzle pipe, and a first valve flap is fitted around the outer periphery of the Laval nozzle. A first elastic diaphragm located inside the supplementary air hole is mounted on the first valve flap. This invention utilizes the flow booster to reduce the high-power operation time of the blower, thereby reducing the blower's energy consumption, lowering noise, and improving the utilization efficiency of wind energy.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to a sputum expectoration device that can automatically compensate for airflow. Background Technology

[0002] Currently, many diseases in the human body can lead to increased sputum secretion, including pneumonia, bronchiectasis, bronchial asthma, and pulmonary fibrosis. Timely promotion of airway secretion migration and clearance is essential, and external mechanical physical therapy for the chest is indispensable. High-frequency oscillation sputum clearance devices are the first choice in the medical field.

[0003] The high-frequency oscillation sputum clearance system in the sputum clearance equipment mainly uses a blower to deliver air into the high-frequency oscillator cavity, which in turn triggers a pressure sensor to send a signal to the control board. The control board then controls the high-frequency oscillator to operate, relying on the high-frequency oscillator to periodically inhale and exhale air, which stimulates the pulsation of airflow. The gas in the high-frequency oscillator cavity is input into the vest through the air duct, and the pulsating airflow generates mechanical vibration on the vest, similar to the action of a human hand patting the patient's back, thus assisting the patient in clearing sputum.

[0004] First, the air replenishment and exhaust processes of this sputum-clearing device have the following drawbacks:

[0005] (1) Short lifespan of blower: As a separate air source to supplement the airflow of high frequency oscillator, the blower needs to work continuously at high power for a long time in order to replenish the dynamic balance of airflow in the cavity of high frequency oscillator, and its lifespan and noise cannot be effectively controlled.

[0006] (2) Poor airflow circulation effect and high energy loss in the cavity: This is mainly because the air inlet of the high-frequency oscillator is directly connected to its cavity. When the elastic vibrating elements at both ends of the high-frequency oscillator work and squeeze the air in the cavity to flow out from the air outlet, the air inlet is affected by the compressed air flow in the cavity and there is a counteracting phenomenon, that is, the air inlet cannot effectively replenish air.

[0007] (3) The precision effect of the auxiliary expectoration treatment is not good and the comfort is poor: Due to the air supply and countercurrent phenomenon of the separate blower, the detection of the air pressure in the high frequency oscillator cavity by a single sensor will have a large error, resulting in an error in the pressure when the compressed air is output.

[0008] Secondly, in addition to the aforementioned issues related to replenishing qi, high-frequency oscillation sputum expectoration devices also have the following drawbacks during operation:

[0009] (1) The equipment has large vibration, high noise and short life: This is mainly because the existing high-frequency oscillation sputum suction equipment adopts a suspended structure with the high-frequency oscillator clamped in front and behind. Specifically, the high-frequency oscillator is suspended between the front and rear buffer support blocks. The front and rear buffer support blocks are fastened to the plastic back shell with screws. It is impossible to concentrate its mass in the rigid part of the equipment. The elastic modulus of the plastic back shell is low. Since the high-frequency oscillator is a dynamic equilibrium that is constantly changing, the cross-sectional size of the suspension is small. The mass of the entire vibration component is distributed on the contact surface of the elastic front and rear buffer support blocks. The vibration reduction support and constraint conditions are insufficient, the vibration reduction effect is not good, and the buffer support blocks are directly subjected to the dynamic equilibrium of the high-frequency oscillator, which is constantly changing. This can easily cause the equipment to shake, and even cause the table where the sputum suction equipment is placed to vibrate. Due to the large vibration, the structural noise is also more obvious. The plastic back shell is affected by the vibration for a long time, and its life is also short.

[0010] (2) The air outlet is directly connected to the exhaust port of the high-frequency oscillator. Without a sound-absorbing structure, the air duct connecting the vest and the air outlet vibrates greatly due to the influence of the airflow excitation force.

[0011] (3) The front shell where the display screen and touch screen of the device are located is directly fastened to the rear shell or frame by screws, and the air outlet directly contacts the front shell. Due to the excitation force in the air duct connected to the air outlet, a large mechanical vibration is generated, which causes the front shell to vibrate, resulting in a poor human-computer interaction experience for the display screen and touch screen. Summary of the Invention

[0012] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a sputum suction device that can automatically compensate for airflow. After the air flows through the flow booster and is boosted by negative pressure, it can draw in external air as a supplementary air source, forming a dual air source input structure. This can reduce the time when the blower operates at high power, reduce the energy consumption of the blower, reduce noise, and improve the utilization efficiency of wind energy.

[0013] To address the aforementioned technical problems, this invention provides a sputum expectoration device with automatic airflow compensation, comprising a housing and a high-frequency oscillator and a blower disposed within the housing. The housing also includes an exhaust platform located in front of the high-frequency oscillator. An air inlet is protruding from the lower front end of the high-frequency oscillator, with an air inlet hole penetrating through the center of the air inlet. At least one supplementary air hole communicating with the air inlet hole is penetrating through the outer periphery of the air inlet. The exhaust platform has an air intake channel at one end communicating with the air inlet hole, and the other end of the air intake channel communicating with… The blower's outlet is connected, and a flow booster is inserted into the air inlet. The flow booster includes a mixing pipe and a nozzle pipe spaced apart internally and externally. A mixing chamber connected to the air supply hole is formed between the mixing pipe and the nozzle pipe. The outer end of the nozzle pipe is connected to the air inlet channel. The inner end of the nozzle pipe has a protruding Laval nozzle facing the mixing pipe. A first valve flap is sleeved on the outer periphery of the Laval nozzle. At least one first elastic valve is extended rearward on the first valve flap, corresponding to the inner side of the air supply hole and blocking the air supply hole.

[0014] Furthermore, the inner end of the mixing tube is placed inside the high-frequency oscillator, and the middle pipe of the mixing tube includes, from the inside out, a stabilizing section with a uniform orifice diameter, a contracting section with a gradually decreasing orifice diameter, and a flared drainage section with a gradually increasing orifice diameter; the stabilizing section is connected to the interior of the high-frequency oscillator, and the inner end of the Laval nozzle extends into the drainage section and is placed in the middle of the drainage section.

[0015] Furthermore, the flow booster also includes a second valve flap fitted outside the mixing tube and a fixed cover fitted at the rear end of the mixing tube. The high-frequency oscillator has a stop portion inside that abuts against the rear end of the fixed cover. The inner end of the mixing tube has two exhaust holes that are both connected to the stabilizing section and face the two ends of the high-frequency oscillator respectively. The second valve flap has two second elastic valves that are correspondingly located outside the exhaust holes and block the exhaust holes.

[0016] Furthermore, the first elastic valve has a slot extending through one end near the first valve flap, and the outer side of the second elastic valve has a flat lug that is arranged along the axial direction of the mixing tube.

[0017] Furthermore, the rear end of the flow stabilizing section is provided with a sealing baffle, the baffle is located behind the exhaust port, and the front end of the baffle is provided with a cone.

[0018] Furthermore, the sputum expectoration device with automatic airflow compensation also includes a control board disposed within the housing. The control board is electrically connected to the blower and the high-frequency oscillator respectively. The control board is provided with a first air pressure sensor and a second air pressure sensor. The upper end of the high-frequency oscillator is provided with a first air nozzle communicating with its interior. The first air nozzle is connected to the first air pressure sensor through an air pipe. The rear end of the mixing tube is also provided with a pressure measuring hole communicating with the flow stabilization section. The bottom of the high-frequency oscillator is provided with a second air nozzle corresponding to and communicating with the pressure measuring hole. The second air nozzle is connected to the second air pressure sensor through an air pipe.

[0019] Furthermore, a dustproof net covering the outside of the air inlet is provided around the air inlet; the rear end of the exhaust platform has a protruding air outlet that is fitted over the air inlet and presses against the dustproof net; a connecting nozzle is protruding on one side of the exhaust platform; the connecting nozzle is connected to the air outlet of the blower through a hose or telescopic tube; and a right-angled air inlet channel is provided between the connecting nozzle and the air outlet.

[0020] Furthermore, the sputum suction device with automatic airflow compensation also includes a hollow metal frame and a vibration isolation platform within the frame. The outer shell is fitted onto the outside of the frame. The high-frequency oscillator, blower, and exhaust platform are all located within the frame. The exhaust platform and vibration isolation platform are located on the front and rear sides of the high-frequency oscillator and encircle it. The bottom of the exhaust platform and vibration isolation platform are provided with support feet that abut against the inner bottom of the frame. The upper and lower ends of the high-frequency oscillator are respectively provided with a first groove and a second groove. The lower front end of the vibration isolation platform has a protruding support part that fits into the second groove. The upper front end of the vibration isolation platform has a protruding clamping part that fits into the first groove. The upper end of the frame is provided with an adjusting bolt that presses down on the clamping part by means of a threaded connection. The front and upper ends of the clamping part are provided with protruding limiting blocks, and a right-angled metal gasket is fitted between the two limiting blocks.

[0021] Furthermore, the exhaust platform includes a front end and a back end, arranged front and rear. The front end of the high-frequency oscillator has two air outlets, and the back end has two air inlets that are fitted one-to-one with the air outlets. The rear side of the front end has two semi-circular first exhaust channels, and the front side of the back end has two semi-circular second exhaust channels. The first and second exhaust channels are assembled one-to-one to form two circular exhaust channels. One end of each exhaust channel is connected to one of the two air inlets. The air inlets are located on the back end. The front end of the front end has two exhaust outlets that are connected to the other end of the exhaust channels. A guide pipe extending outward from the outer shell is inserted into the exhaust outlet. A muffler is provided in the middle of the exhaust channel. The muffler includes an annular body and a circular shuttle located at the center of the body via a connecting plate. Multiple air channels are formed between the body, the connecting plate, and the circular shuttle, extending along their axial direction. At least one annular air cavity is recessed on the outer periphery of the body, and the annular air cavity has several air holes that communicate with the air channels.

[0022] Furthermore, the outer shell includes a front shell fitted at the front end of the frame and a rear shell fitted at the rear end of the frame. Both the front shell and the rear shell are fixed to the frame by screws, and an elastic vibration isolation ring is provided between the screws and the front shell, the rear shell, or the frame. The lower end of the front shell is provided with a hollow groove, and a cover plate covering the hollow groove is also fitted at the lower end of the front shell. An elastic vibration isolation pad is provided between the cover plate and the front shell. The cover plate is provided with two through holes for the air ducts to pass through one-to-one.

[0023] Furthermore, the lower end of the front shell is provided with a hollow groove, and the lower end of the front shell is also fitted with a cover plate that covers the hollow groove. An elastic vibration damping pad is provided between the cover plate and the front shell, and the cover plate is provided with two through holes for the air guide pipes to pass through one by one.

[0024] The present invention has the following beneficial effects:

[0025] (1) By adding a booster at the air inlet, when the blower inputs airflow to the high-frequency oscillator, the airflow flows through the Laval nozzle of the nozzle tube. Due to the smaller cross-sectional area of ​​the Laval nozzle section, the airflow forms a jet, generating a suction flow. Under the action of the suction flow, the gas around the mixing chamber is sucked into the mixing tube, causing the atmospheric pressure at the mixing chamber to decrease, forming an internal and external atmospheric pressure difference. The first elastic valve deforms inward under the action of the external atmospheric pressure and opens the air inlet. External air flows into the mixing chamber through the air inlet, that is, the negative pressure is used to automatically compensate the airflow inward, so that external air can be sucked in as a supplementary air source, continuously supplying air source to the mixing tube and the high-frequency oscillator. Together with the air source supplied by the blower, a dual air source input structure is formed, which reduces the amount of gas input required by the blower, thereby reducing the time when the blower operates at high power, reducing the energy consumption of the blower, reducing noise, and improving the utilization efficiency of wind energy.

[0026] (2) Two exhaust holes with different orientations and a second valve flap that cooperates with them are provided on the inner end of the mixing tube. When the initial gas is replenished, the two second elastic valve flaps on the second valve flap deform outward and open the exhaust holes after being pressured by the input gas. When the elastic vibrating element at one end of the high-frequency oscillator squeezes the gas in the cavity to the other side, the second elastic valve flap in the same direction is subjected to the gas pressure and makes it stick to the outer periphery of the mixing tube and close the exhaust hole corresponding to it. The other second elastic valve flap in the opposite direction is not subjected to the gas pressure in the cavity and remains open. The airflow flowing through the mixing tube quickly replenishes the high-frequency oscillator cavity from the opened exhaust hole. Therefore, the airflow collision phenomenon at the air inlet of the high-frequency oscillator can be eliminated and the effect of airflow circulation in the cavity can be improved.

[0027] (3) By setting two air pressure sensors to detect the pressure in the high-frequency oscillator cavity and the pressure in the steady flow section of the mixing tube respectively, the working condition of the blower can be controlled more accurately through the pressure difference between the two air pressure sensors, and the detection error is reduced, improving energy efficiency and patient comfort.

[0028] (4) A metal frame is added inside the outer shell, and a vibration isolation platform and an exhaust platform are designed inside the frame. The two form an encircling space, in which the high-frequency oscillator is placed. The support feet at the bottom of the vibration isolation platform and the exhaust platform abut against the bottom of the inner side of the frame. When the high-frequency oscillator is working, the vibration is first buffered and damped by the vibration isolation platform and the exhaust platform, absorbing most of the vibration energy, and then transmitted to the frame. The frame stabilizes the entire vibration, so that the vibration is not directly transmitted to the outer shell. Therefore, the mechanical vibration of the whole machine and the noise caused by mechanical vibration can be reduced, and the service life of the equipment can be extended.

[0029] (5) Grooves are provided at the upper and lower ends of the high-frequency oscillator, and a support and clamping part are provided on the vibration isolation platform to cooperate with the two grooves, so that the vibration isolation platform forms a U-shaped ring structure. When the high-frequency oscillator is put into the vibration isolation platform, the adjusting bolt is tightened downwards. The adjusting bolt will press the clamping part downwards, so that the clamping part is pressed into the groove at the upper end of the high-frequency oscillator. The upper and lower ends of the high-frequency oscillator are subjected to pressure from the clamping part and the support part, respectively, and the front and rear are subjected to the clamping force of the vibration isolation platform and the exhaust platform. That is, the high-frequency oscillator is fastened to the frame through multiple fixed points on the upper, lower, left and right sides, so that the mass of the high-frequency oscillator is concentrated on the rigid frame. The vibration generated by the high-frequency oscillator during operation is damped by the vibration isolation platform and the exhaust platform, and then the entire high-frequency oscillator is stabilized by the rigid frame, reducing the outward transmission of vibration, making the vibration reduction and noise reduction effect of the equipment obvious and improving the service life of the equipment.

[0030] (6) A silencer was added to the exhaust channel. When the air compressed by the high-frequency oscillator flows outward, it needs to flow through the silencer before flowing outward. This improves the vibration of the compressed air excitation force and disperses it into vibrations of different flow velocities, thereby reducing the vibration of the air tube connected to the vest and improving the patient's comfort.

[0031] (7) An elastic vibration isolation ring is provided between the screw and the front shell, rear shell or frame. The elastic vibration isolation ring completely isolates the rigid connection between the shell and the frame, so that the frame and the shell form an elastic connection to reduce the vibration force transmitted from the frame to the shell. An elastic vibration isolation pad is also provided between the cover plate and the front shell to reduce vibration and absorb vibration energy. This can reduce the vibration force on the front shell when the air pipe vibrates, reduce the shaking during human-machine interaction, and improve the user's comfort.

[0032] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of the invention. Attached Figure Description

[0033] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, do not constitute an undue limitation of the invention. In the drawings:

[0034] Figure 1 This is a schematic diagram of the sputum suction device in the embodiment;

[0035] Figure 2 This is a schematic diagram of the interior of the sputum suction device after half-section of the outer shell in the embodiment;

[0036] Figure 3 This is an exploded view of the sputum suction device in the embodiment;

[0037] Figure 4 This is a cross-sectional view of the sputum suction device after the airway tube has been removed in the embodiment;

[0038] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0039] Figure 6 This is a schematic diagram of the sputum suction device after the outer casing has been removed in the embodiment;

[0040] Figure 7 for Figure 6 A schematic diagram after the air tube has been removed;

[0041] Figure 8 This is a schematic diagram of the sputum suction device after removing the outer shell, air duct, and frame in the embodiment.

[0042] Figure 9 This is an exploded view of the flow booster in the embodiment;

[0043] Figure 10 This is a cross-sectional view of the flow booster in the embodiment;

[0044] Figure 11 This is a schematic diagram of the high-frequency oscillator in the embodiment;

[0045] Figure 12 This is a schematic diagram of the high-frequency oscillator from another perspective in the embodiment;

[0046] Figure 13 This is a schematic diagram of the control system used in the sputum suction device in another specific implementation case;

[0047] Figure 14 This is an exploded view of the exhaust platform in the embodiment;

[0048] Figure 15 This is an exploded view of the exhaust platform from another perspective in the embodiment;

[0049] Figure 16 This is a schematic diagram of the vibration isolation platform in the embodiment;

[0050] Figure 17 This is a schematic diagram of the muffler in the embodiment;

[0051] Figure 18 This is a front view of the muffler in the embodiment;

[0052] Figure 19 This is a side view of the muffler in the embodiment.

[0053] Figure 20 This is an exploded view of the front shell and cover plate in the embodiment;

[0054] Figure 21 This is a schematic diagram of the interior of a high-frequency oscillator after the housing has been removed in one embodiment. Detailed Implementation

[0055] To better understand the technical content of the present invention, the present invention will be further introduced and described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the use of terms such as "first" and "second" in the text is for distinguishing different components, and does not represent the order of events, nor does it limit "first" and "second" to different types.

[0056] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0057] Example

[0058] like Figures 1 to 21 As shown in this embodiment, the sputum suction device with automatic airflow compensation includes a hollow metal frame 1, a high-frequency oscillator 2 and a blower 13 housed within the frame 1, and a housing 3 fitted over the frame 1. The frame 1 also includes an exhaust platform 4 and a vibration isolation platform 5, respectively located on the front and rear sides of the high-frequency oscillator 2 and surrounding it. The rear shape of the exhaust platform 4 and the front shape of the vibration isolation platform 5 match the shape of the high-frequency oscillator 2, forming a surrounding clamping structure. The bottom of both the exhaust platform 4 and the vibration isolation platform 5 has support feet 50 that abut against the inner bottom of the frame 1. Thus, the frame 1 is used to support the exhaust platform 4 and the vibration isolation platform 5. The high-frequency oscillator 2 is supported between the two. Here, a metal frame is added inside the shell, and a vibration isolation platform and an exhaust platform are designed inside the frame. The two form an enclosing space in which the high-frequency oscillator is placed, and the support feet at the bottom of the vibration isolation platform and the exhaust platform abut against the bottom of the inner side of the frame. When the high-frequency oscillator is working, the vibration is first buffered and damped by the vibration isolation platform and the exhaust platform, absorbing most of the vibration energy, and then transmitted to the frame. The frame stabilizes the entire vibration, so that the vibration is not directly transmitted to the outer shell. Therefore, the mechanical vibration of the whole machine and the noise caused by mechanical vibration can be reduced, and the service life of the equipment can be extended.

[0059] In one embodiment, such as Figure 6 and Figure 7 As shown, a vertically installed fixing plate 6 is fixed inside the rear end of the frame by welding, and the vibration isolation platform 5 is fixed to the front side of the fixing plate 6 by screws.

[0060] In one embodiment, such as Figures 1 to 15As shown, the exhaust platform 4 includes a front platform 41 and a back platform 42 arranged front and rear. The front end of the high-frequency oscillator 2 has two air outlets 23. The back platform 42 has two air inlets 43 that are fitted into the air outlets 23 one by one. The rear side of the front platform 41 has two semi-circular first exhaust channels 45, and the front side of the back platform 42 has two semi-circular second exhaust channels 46. The first exhaust channels 45 and the second exhaust channels 46 are assembled in a one-to-one correspondence to form two circular exhaust channels. That is, two circular exhaust channels with one end connected to the air inlets 42 are formed between the front platform 41 and the back platform 42. The front end of the front platform 41 has two other exhaust channels connected to the exhaust channels. One end is connected to the exhaust port 44. An air guide tube 40 extending outward from the outer shell 3 is inserted at the exhaust port. The air guide tube 40 is connected to the vest worn by the user to replenish the vest with air. A silencer 7 with a matching shape is provided in the middle of the exhaust channel. The air compressed by the high-frequency oscillator 2 flows outward after passing through the air outlet 23, the air inlet 43, the silencer 7 and the exhaust port 44 in sequence. Here, the silencer is added in the exhaust channel. When the air compressed by the high-frequency oscillator flows outward, it must flow through the silencer before flowing outward. This improves the vibration of the compressed air excitation force and disperses it into vibrations of different flow velocities, thereby reducing the vibration of the air guide tube connected to the vest and improving the patient's comfort.

[0061] Preferably, the muffler is cylindrical and matches the exhaust passage.

[0062] As a preferred option, such as Figures 17 to 19 As shown, the muffler 7 includes an annular body 71 and a shuttle 73 located at the center of the body 71 via three connecting plates 72. Three air channels 74 are formed between the body 71, the connecting plates 72 and the shuttle 73, extending along their axial direction. At least one annular air cavity 75 is recessed on the outer periphery of the body 71, and several air holes 76 communicating with the air channels 74 are provided on the annular air cavity 75.

[0063] As a preferred option, such as Figures 14 to 15 As shown, the front seat 41 and the back seat 42 are clamped and fixed by the front clamp 47 and the rear clamp 48 arranged in front and back, and the bottom of the front clamp 47 is fixed to the inner bottom of the frame 1 by screws.

[0064] In one embodiment, such as Figures 1 to 12As shown, the lower front end of the high-frequency oscillator 2 has a protruding air inlet 25, with an air inlet hole 24 penetrating through the center of the air inlet 25. Two symmetrically arranged supplementary air holes 26, connected to the air inlet hole 24, penetrate the outer periphery of the air inlet 25. The back seat 42 has an air intake channel 49, one end of which is connected to the air inlet hole 24, and the other end of which is connected to the air outlet of the blower 13. A flow booster 8 is inserted into the air inlet hole 24. The flow booster 8 includes a mixing pipe 81 and a nozzle pipe 82 spaced apart internally and externally. A mixing chamber 83 is formed between the pipe 81 and the nozzle pipe 82, which communicates with the air supply hole 26. That is, the position of the mixing chamber 83 corresponds to the air supply hole 26. The outer end of the nozzle pipe 82 is connected to the air intake channel 49. The inner end of the nozzle pipe 82 is provided with a Laval nozzle 821 facing the mixing pipe 81. A first valve flap 84 is sleeved on the outer periphery of the Laval nozzle 821. Two first elastic valves 841 are provided on the first valve flap 84, which are correspondingly located inside the two air supply holes 26 and block the air supply holes 26.

[0065] In the above-mentioned normal un-replenished state, the first elastic valve 841 is used to seal the air inlet 26, keeping it in a closed state. However, when the blower replenishes air into the high-frequency oscillator, the airflow input through the air inlet channel 49 flows through the Laval nozzle 821 of the nozzle pipe 82. Due to the reduced cross-sectional area of ​​the Laval nozzle section, the airflow forms a jet, generating entrainment flow. Under the action of entrainment flow, the gas around the mixing chamber is drawn into the mixing pipe, causing the atmospheric pressure at the mixing chamber to decrease, forming an internal and external atmospheric pressure difference. Under the action of external atmospheric pressure, the elastic valve deforms inward and opens the air inlet. External air flows into the mixing chamber through the air inlet, which automatically compensates for the airflow by using negative pressure. This allows for the additional intake of external air as a supplementary air source, continuously supplying air to the mixing tube and high-frequency oscillator. This forms a dual air source input structure with the air source supplied by the blower, reducing the amount of gas input required by the blower. This reduces the time the blower operates at high power, reduces the energy consumption of the blower, lowers noise, and improves the utilization efficiency of wind energy.

[0066] As a preferred option, such as Figures 5 to 10As shown, the flow booster 8 also includes a second valve disc 85 fitted outside the mixing pipe 81 and a fixing cover 86 fitted at the rear end of the mixing pipe 81 and pressing against the second valve disc 85 outward. The second valve disc 85 and the fixing cover 86 are both located inside the high-frequency oscillator 2. The high-frequency oscillator 2 has a stop part 27 that abuts against the rear end of the fixing cover 86. The middle pipe of the mixing pipe 81 includes, from the inside out, a flow stabilizing section 811 with a uniform orifice diameter, a contracting section 812 with a gradually decreasing orifice diameter, and a flared drainage section 813 with a gradually increasing orifice diameter. This multi-segment structure can improve the airflow velocity through the mixing tube; the inner end of the Laval nozzle 821 extends into the guide section 813 and is placed in the middle of the guide section 813; the inner end of the mixing tube 81 is provided with two exhaust holes 814 for connecting the flow stabilization section and the cavity space of the high-frequency oscillator, and the two exhaust holes face the two ends of the high-frequency oscillator 2 respectively, that is, the two exhaust holes are arranged in opposite directions; the second valve disc 85 is provided with two second elastic valves 851 that are correspondingly arranged outside the exhaust holes 814 and block the exhaust holes 814.

[0067] In the above-mentioned normal un-replenished state, the second elastic valve 851 is used to close the exhaust port 814, keeping it in a closed state. However, when the blower replenishes the high-frequency oscillator with gas, the two second elastic valves on the second valve disc deform outward and open the exhaust port after being pressured by the input gas. When the elastic vibrating element at one end of the high-frequency oscillator squeezes the gas in the cavity to the other side, the second elastic valve in the same direction is subjected to the gas pressure, causing it to press tightly against the outer periphery of the mixing tube and close its corresponding exhaust port. The other second elastic valve in the opposite direction is not subjected to the gas pressure in the cavity and remains open. The airflow flowing through the mixing tube quickly replenishes the high-frequency oscillator cavity from the opened exhaust port. Therefore, the airflow collision phenomenon at the air inlet of the high-frequency oscillator can be eliminated, and the effect of airflow circulation in the cavity can be improved.

[0068] Specifically, such as Figure 10 As shown, the orifice diameter at the Laval nozzle outlet is D1, the minimum orifice diameter at the contraction section is D2, and the orifice diameter at the steady flow section is D3. From fluid mechanics, the continuity equation for incompressible air (gas flowing at low speeds can be approximated as incompressible air) is:

[0069] A1V1=A2V2=A3V3,A 1＝ π(D1 / 2) 2 A 2＝ π(D² / 2) 2 A 3＝ π(D3 / 2) 2

[0070] In the formula, A1, A2, and A3 represent the cross-sectional areas of the pipe, in meters (m²). 2

[0071] V1, V2, V3 — airflow velocities, in m / s

[0072] From the above equation, we can see that as the cross-section increases, the flow velocity decreases; as the cross-section decreases, the flow velocity increases. Therefore, A3>A2>A1, V1>V2>V3.

[0073] For horizontal pipelines, according to Bernoulli's ideal energy equation for incompressible air:

[0074] P1+(1 / 2)ρv1 2 =P2+(1 / 2)ρv2 2 =P3+(1 / 2)ρv3 2

[0075] In the formula, P1, P2, and P3 represent the corresponding pressures at sections A1, A2, and A3, respectively, in Pa.

[0076] V1, V2, V3 — the corresponding flow velocities at cross sections A1, A2, and A3, in m / s.

[0077] ρ — density of air, in kg / m³ 3

[0078] From the above equation, we can see that as the pressure decreases, the flow velocity increases. Therefore, P3>P2>P1, V1>V2>V3. Because the cross-sectional area of ​​the Laval nozzle section decreases, the airflow forms a jet, generating entrainment flow. The gas around the mixing chamber is drawn into the mixing tube, the first elastic valve opens, and external air is replenished into the mixing chamber and transported into the mixing tube, thereby increasing the airflow velocity at the inlet section, which is A.

[0079] As the cross-sectional area of ​​the steady flow section increases, the airflow velocity decreases rapidly, resulting in an increase in the pressure difference across the mixing tube, which further increases the airflow velocity at the diversion section, hence B.

[0080] When the elastic vibrating element at one end of the high-frequency oscillator squeezes the gas in the cavity to the other side, the second elastic valve in the same direction is subjected to gas pressure, causing it to press tightly against the outer periphery of the mixing tube and close its corresponding exhaust port. The second elastic valve in the opposite direction remains in a pushed-away state, meaning that the other exhaust port on the mixing tube is in an open state. The airflow flowing through the mixing tube quickly passes through this open exhaust port and replenishes the high-frequency oscillator cavity, thus eliminating the airflow collision phenomenon at the oscillator inlet. Since one of the two exhaust ports in the mixing tube is closed at this time, the total cross-sectional area of ​​the exhaust ports used for outputting airflow becomes smaller, thereby further accelerating the airflow velocity in the mixing tube, which is C.

[0081] In summary, the structure described at points A, B, and C in this embodiment can achieve a three-stage acceleration automatic airflow compensation scheme.

[0082] As a preferred option, such as Figures 5 to 10 As shown, a slot 842 is provided through one end of the first elastic valve 841 near the first valve disc 84. The slot 842 reduces the strength of the first elastic valve 841, making it easier for it to elastically deform and open the air inlet after being compressed. The outer side of the second elastic valve 851 has a flat lug 852 that is arranged along the axial direction of the mixing pipe 81, which increases the contact area between the second elastic valve 851 and the airflow, making it easier for the second elastic valve 851 to open and close after being compressed.

[0083] Preferably, the rear end of the flow stabilizing section 811 is provided with a sealing baffle 815. The baffle 815 is located behind the exhaust port 814, so that the gas can only flow out through the exhaust port 814. The front end of the baffle 815 is provided with a cone, so that the airflow diffuses from the center to the surrounding area.

[0084] In one embodiment, such as Figures 5 to 15 As shown, a dustproof net 251 covering the outside of the air inlet 25 and the air supply hole 26 is provided on the outer periphery to prevent dust from entering; the rear end of the back seat 42 has a protruding air outlet 421 that is fitted on the outside of the air inlet 25 and pressed against the dustproof net 251; a connecting nozzle 422 is protruding on one side of the back seat 42; the connecting nozzle 422 is connected to the air outlet of the blower 13 through a hose or telescopic pipe 15; a right-angled air intake channel 49 is formed between the connecting nozzle 422 and the air outlet 421; that is, during processing, holes are drilled at the axis of the connecting nozzle 422 and the air outlet 421, and the inner ends of the drilled holes are connected to form the air intake channel 49. This structure facilitates production and processing.

[0085] In one embodiment, such as Figures 8 to 10 As shown, the sputum suction device also includes a control board 9 located within the frame. The control board 9 is electrically connected to the blower 13 and the high-frequency oscillator 2. The control board 9 is equipped with a first air pressure sensor 91 and a second air pressure sensor 92. The upper end of the high-frequency oscillator 2 is equipped with a first air nozzle 28 that communicates with its interior. The first air nozzle 28 is connected to the first air pressure sensor 91 via an air tube 281 and is used to detect the pressure inside the high-frequency oscillator 2. The bottom of the rear end of the mixing tube 81 is also equipped with a pressure measuring hole 816 that communicates with the flow stabilization section 811. The bottom of the high-frequency oscillator 2 is equipped with a second air nozzle 29 that corresponds to and communicates with the pressure measuring hole 816. The second air nozzle 29 is connected to the second air pressure sensor 92 via an air tube 281 and is used to detect the pressure at the flow stabilization section 811. Thus, the working condition of the blower can be more accurately controlled by the pressure difference between the two air pressure sensors, i.e., the power of the blower can be dynamically adjusted, and the detection error can be reduced, improving energy efficiency and patient comfort.

[0086] In a specific implementation case, when initial air replenishment is performed and the first air pressure sensor detects that the pressure inside the high-frequency oscillator cavity has reached the pressure value required for operation, the high-frequency oscillator starts to work to compress the gas inside the cavity. At this time, the second air pressure sensor starts to work to monitor the pressure at the steady flow section. When the pressure difference between the two air pressure sensors is greater than the preset value, the working power of the blower is increased, and when the pressure difference between the two air pressure sensors is less than or equal to the preset value, the working power of the blower is reduced.

[0087] In another specific implementation case, such as Figure 13 As shown, this sputum suction device employs a closed-loop control system: the system continuously monitors the air pressure inside the high-frequency oscillator cavity and the air pressure in the steady-flow section through a first air pressure sensor, and feeds the real-time data back to the control unit. Upon initial system startup, the blower delivers gas into the high-frequency oscillator cavity. When the first air pressure sensor detects the target air pressure value p for the selected mode (at this time, p = r(t)), the high-frequency oscillator compresses the internal gas to expel it. At this time, the second air pressure sensor activates, feeding back the monitored pressure data c(t) to the control unit on the control board. The control unit then compares the new pressure value c(t) with the previous pressure value r(t) to obtain the deviation value e(t). Using a proportional-integral-derivative (PID) control algorithm, the control unit calculates a new signal u(t) and feeds it back to the blower, adjusting the blower's output power. This constitutes one cycle of blower output adjustment. The system operates for multiple cycles, thus forming a closed-loop control system.

[0088] Specifically, proportional (P) control adjusts the control output based on the current error magnitude. The characteristics of proportional control are rapid and direct action, and its output is proportional to the error; the proportional gain (Kp) determines the strength of the proportional action.

[0089] Proportional (P) control formula: P = Kp × e(t)

[0090] Where e(t) is the pressure error at time t, and Kp is the proportional gain.

[0091] Integral (I) control works by integrating the error to eliminate the steady-state error. The integral action takes into account the cumulative effect of the error; even if the error is small, as long as it persists, the integral control will eventually accumulate enough control action to eliminate it.

[0092] Integral (I) control formula:

[0093] Where Ki is the integral gain. It is the integral of the error from the initial moment to time t.

[0094] The function of derivative (D) control is to adjust the control output based on the rate of change of the error (i.e., the derivative of the error). The derivative action can predict the development trend of the error, helping to reduce or prevent overshoot and improve the dynamic performance of the system.

[0095] Differential (D) control formula:

[0096] Where Kd is the differential gain, It is the derivative of the error e(t).

[0097] The total output of the PID control unit is the sum of the proportional, integral, and derivative components:

[0098]

[0099] The control unit adopts a proportional-integral-derivative (PID) control algorithm, which automatically adjusts the output power of the blower according to the deviation between the set value and the actual value to maintain stable air pressure, reduce the blower's long-term high-power operation, reduce noise, improve lifespan, and improve energy efficiency.

[0100] As a preferred option, such as Figures 2 to 16 As shown, the high-frequency oscillator 2 has a first groove 21 and a second groove 22 respectively at the middle of its upper and lower ends. The lower front end of the vibration isolation platform 5 has a protruding support part 51 that fits into the second groove 22, and the upper front end of the vibration isolation platform 5 has a protruding clamping part 52 that fits into the first groove 21. The upper end of the frame 1 has an adjusting bolt 11 that presses the clamping part 52 downwards via a threaded connection. Here, grooves are provided at the upper and lower ends of the high-frequency oscillator, and the vibration isolation platform has a support part and a clamping part that cooperate with the two grooves, forming a U-shaped encircling structure. When the high-frequency oscillator is fitted into the vibration isolation platform, it... Tighten the adjusting bolt, which will push the clamping part downwards, pressing it into the first groove at the top of the high-frequency oscillator. The upper and lower ends of the high-frequency oscillator are subjected to pressure from the clamping part and the support part, respectively, while the front and rear are subjected to clamping forces from the vibration isolation platform and the exhaust platform. In other words, the high-frequency oscillator is fixed to the frame by multiple fixed points on the top, bottom, left, and right, so that the mass of the high-frequency oscillator is concentrated on the rigid frame. The vibration generated by the high-frequency oscillator during operation is damped by the vibration isolation platform and the exhaust platform, and then the rigid frame stabilizes the entire high-frequency oscillator, reducing the outward transmission of vibration. This makes the vibration reduction and noise reduction effect of the equipment obvious and improves the service life of the equipment.

[0101] As a preferred option, such as Figures 2 to 16As shown, the surfaces of the second groove 22 and the support 51 that are in contact with each other, as well as the surfaces of the first groove 21 and the pressing part 52 that are in contact with each other, are all flat, which can increase the clamping area between the three and improve the clamping force. The front end and the upper end of the pressing part 52 are provided with protruding limiting blocks 53, and a right-angled metal gasket 54 is fitted between the two limiting blocks 53. A locking seat 10 that is threadedly connected to the adjusting bolt 11 is welded to the middle of the upper end of the frame. When the adjusting bolt 11 is tightened downwards, the force is applied to the metal gasket 54, which can balance the pressure and improve the strength of the pressing part, and avoid the problem of damage to the pressing part 52 after being subjected to force.

[0102] In one embodiment, such as Figures 2 to 7 As shown, the blower 13 is fixed inside the frame 1 by the fixing bracket 12. Several through holes 30 are provided on both sides of the outer shell 3. A fan 14 corresponding to the through hole 30 is fixed on both sides of the frame 1. The fan 14 is electrically connected to the control board and is used for ventilation and heat dissipation. In use, one fan can draw in air and the other fan can blow air out to form a convection structure, or both fans can blow air out.

[0103] In one embodiment, such as Figures 1 to 2 As shown, the sputum suction device also includes two air guide tubes 40 respectively fitted at the two exhaust ports 44, through which compressed air is delivered to the outer vest; preferably, the air guide tube 40 is a telescopic air guide tube.

[0104] In one embodiment, such as Figures 2 to 6 As shown, the outer shell 3 includes a front shell 31 fitted at the front end of the frame 1 and a rear shell 32 fitted at the rear end of the frame 1. Both the front shell 31 and the rear shell 32 are fixed to the frame 1 by screws, and elastic vibration isolation rings 33 are provided between the screws and the front shell 31, the rear shell 32 and / or the frame 1. That is, elastic vibration isolation rings 33 are fitted at the holes in the front shell and the rear shell for the screws to pass through and / or at the holes in the frame 1 for the screws to pass through, so that the frame and the front shell and the rear shell are elastically connected to reduce the vibration force transmitted from the frame to the outer shell.

[0105] In one embodiment, such as Figures 2 to 20As shown, a display screen 38 is provided on the inner side of the upper end of the front shell 31, and a touch panel 39 corresponding to the display screen 38 is provided on the upper end of the front shell 31. The display screen and the touch panel are electrically connected to the control board respectively. A hollow groove 34 is provided at the lower end of the front shell 31, and a cover plate 35 covering the hollow groove 34 is also fitted on the lower end of the front shell 31. An elastic vibration damping pad 36 is provided between the cover plate 35 and the front shell 31. The cover plate 35 is provided with two through holes 37 for the air duct 40 to pass through one-to-one. When the air duct 40 vibrates, the vibration force will be transmitted to the cover plate 35. The elastic vibration damping pad plays a role in shock absorption and vibration energy absorption, which can reduce the vibration force on the front shell when the air duct vibrates, reduce the shaking during human-computer interaction, and improve the user's comfort.

[0106] In other embodiments, such as Figure 5 As shown, a sealing ring 817 is provided between the nozzle pipe 82 and the mixing pipe 81 and the air inlet 24.

[0107] In other embodiments, the frame is made of a metal with a high modulus of elasticity, such as stainless steel.

[0108] In other embodiments, the front shell, rear shell, and cover plate are thermoplasticized from plastic sheets.

[0109] In other embodiments, both the vibration isolation platform and the exhaust platform are made of elastic high-damping materials, such as rubber and silicone.

[0110] In other embodiments, the hose or telescopic tube is made of an elastic material, such as soft rubber.

[0111] In other embodiments, the high-frequency oscillator is a high-frequency vibrator.

[0112] In other embodiments, such as Figure 21 As shown, the high-frequency oscillator 2 has flexible elastic vibrating elements 200 at both ends of its housing. The inner ends of the two elastic vibrating elements 200 are each provided with a connecting rod 201. The rear end of the high-frequency oscillator 2 is provided with a motor 202. The rotating shaft of the motor 202 is located in the middle of the cavity of the high-frequency oscillator 2, and an eccentric rotor 203 is provided on the rotating shaft. A fixed rod 204 extends outward from one side of the front end of the eccentric rotor 203. The free end of the connecting rod 201 is rotatably mounted on the fixed rod 204 through a bearing 205. Thus, during the rotation of the eccentric rotor, the fixed rod 204 alternately pulls the two elastic vibrating elements 200 to compress air inward, that is, the direction of each inward air compression is opposite.

[0113] The technical solutions provided by the embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of the present invention. The descriptions of the embodiments above are only for helping to understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A sputum expectoration device capable of automatically compensating for airflow, comprising a housing and a high-frequency oscillator and a blower disposed within the housing, characterized in that, The housing also includes an exhaust platform located in front of the high-frequency oscillator. The lower front end of the high-frequency oscillator has a protruding air inlet, and an air inlet hole is provided through the middle of the air inlet. At least one air replenishment hole communicating with the air inlet hole is provided through the outer periphery of the air inlet. The rear end of the exhaust platform has an air intake channel with one end communicating with the air inlet hole. The other end of the air intake channel is connected to the air outlet of the blower. A flow booster is inserted in the air inlet hole. The flow booster includes a mixing pipe and a nozzle pipe arranged at intervals. A mixing chamber communicating with the air replenishment hole is formed between the mixing pipe and the nozzle pipe. The outer end of the nozzle pipe is connected to the air intake channel. The inner end of the nozzle pipe has a protruding Laval nozzle facing the mixing pipe. A first valve flap is sleeved on the outer periphery of the Laval nozzle. At least one first elastic valve is provided on the first valve flap, which is correspondingly located inside the air replenishment hole and blocks the air replenishment hole. The inner end of the mixing tube is placed inside the high-frequency oscillator. The middle section of the mixing tube includes, from the inside out, a stabilizing section with a uniform orifice diameter, a contracting section with a gradually decreasing orifice diameter, and a flared drainage section with a gradually increasing orifice diameter. The stabilizing section is connected to the interior of the high-frequency oscillator. The inner end of the Laval nozzle extends into the drainage section and is placed in the middle of the drainage section. The flow booster also includes a second valve flap fitted outside the mixing tube and a fixed cover fitted at the rear end of the mixing tube. The high-frequency oscillator has a stop portion inside that abuts against the rear end of the fixed cover. The inner end of the mixing tube has two exhaust holes that are both connected to the stabilizing section and face the two ends of the high-frequency oscillator respectively. The second valve flap has two second elastic valves that are correspondingly located outside the exhaust holes and block the exhaust holes.

2. The sputum expectoration device with automatic airflow compensation as described in claim 1, characterized in that, The first elastic valve has a slot through one end near the first valve flap, and the outer side of the second elastic valve has a flat lug that is arranged along the axial direction of the mixing tube.

3. The sputum expectoration device with automatic airflow compensation as described in claim 2, characterized in that, The rear end of the flow stabilizing section is provided with a sealing baffle, which is located behind the exhaust port, and the front end of the baffle is provided with a cone.

4. The sputum expectoration device with automatic airflow compensation as described in claim 3, characterized in that, It also includes a control board located inside the housing, which is electrically connected to the blower and the high-frequency oscillator respectively. The control board is provided with a first air pressure sensor and a second air pressure sensor. The upper end of the high-frequency oscillator is provided with a first air nozzle that communicates with its interior. The first air nozzle is connected to the first air pressure sensor through an air pipe. The bottom of the rear end of the mixing tube is also provided with a pressure measuring hole that communicates with the flow stabilization section. The bottom of the high-frequency oscillator is provided with a second air nozzle that corresponds to and communicates with the pressure measuring hole. The second air nozzle is connected to the second air pressure sensor through an air pipe.

5. The sputum suction device with automatic airflow compensation as described in any one of claims 1-4, characterized in that, The air inlet is covered with a dustproof net that covers the outside of the air supply hole; the rear end of the exhaust platform has a protruding air outlet that is fitted over the air inlet and presses against the dustproof net; one side of the exhaust platform has a protruding connecting nozzle that is connected to the air outlet of the blower through a hose or telescopic tube; and a right-angled air inlet channel is provided between the connecting nozzle and the air outlet.

6. The sputum expectoration device with automatic airflow compensation as described in claim 5, characterized in that, It also includes a hollow metal frame and a vibration isolation platform inside the frame. The outer shell is fitted onto the outside of the frame. The high-frequency oscillator, blower, and exhaust platform are all located inside the frame. The exhaust platform and vibration isolation platform are located on the front and rear sides of the high-frequency oscillator and surround the high-frequency oscillator. The bottom of the exhaust platform and vibration isolation platform are provided with support feet that abut against the inner bottom of the frame. The upper and lower ends of the high-frequency oscillator are respectively provided with a first groove and a second groove. The lower front end of the vibration isolation platform has a protruding support part that fits into the second groove. The upper front end of the vibration isolation platform has a protruding clamping part that fits into the first groove. The upper end of the frame is provided with an adjusting bolt that presses down on the clamping part by means of a threaded connection. The front end and upper end of the clamping part are provided with protruding limiting blocks. A right-angled metal gasket is fitted between the two limiting blocks.

7. The sputum expectoration device with automatic airflow compensation as described in claim 6, characterized in that, The exhaust platform includes a front end and a back end, arranged front and rear. The front end of the high-frequency oscillator has two air outlets, and the back end has two air inlets that are fitted one-to-one with the air outlets. The rear side of the front end has two semi-circular first exhaust channels, and the front side of the back end has two semi-circular second exhaust channels. The first and second exhaust channels are assembled one-to-one to form two circular exhaust channels. One end of each exhaust channel is connected to one of the two air inlets. The air inlets are located on the back end. The front end of the front end has two exhaust ports that are connected to the other end of the exhaust channels. A guide pipe extending outward from the outer shell is inserted into the exhaust port. A muffler is provided in the middle of the exhaust channel. The muffler includes an annular body and a circular shuttle located at the center of the body via a connecting plate. Multiple air channels are formed between the body, the connecting plate, and the circular shuttle, extending along their axial direction. At least one annular air cavity is recessed on the outer periphery of the body, and the annular air cavity has several air holes that communicate with the air channels.

8. The sputum expectoration device with automatic airflow compensation as described in claim 7, characterized in that, The outer shell includes a front shell fitted at the front end of the frame and a rear shell fitted at the rear end of the frame. Both the front shell and the rear shell are fixed to the frame by screws, and an elastic vibration isolation ring is provided between the screws and the front shell, the rear shell, or the frame. The lower end of the front shell is provided with a hollow groove, and a cover plate covering the hollow groove is also fitted at the lower end of the front shell. An elastic vibration isolation pad is provided between the cover plate and the front shell. The cover plate is provided with two through holes for the air ducts to pass through one-to-one.

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