Differential pressure flow sensor of medical oxygen generator

Abstract

The invention relates to the technical field of oxygen generators, and discloses a medical oxygen generator differential pressure flow sensor which comprises a bottom plate, a sensor, a connecting pipe, an air pipe and a stabilizing device, the sensor is fixed to the upper surface of the bottom plate, the connecting pipe is fixed to the upper surface of the sensor, the air pipe is inserted into the upper surface of the connecting pipe, and the stabilizing device is arranged on the upper surface of the sensor. The stabilizing device comprises a stand column, the stand column is fixed to the upper surface of the sensor, a rectangular plate is fixedly connected to the position over the stand column, a mounting plate is fixedly connected to the upper surface of the rectangular plate, a threaded rod is rotatably connected to the surface of the mounting plate, a rotary knob is fixedly connected to the surface of the threaded rod, and a sliding hole is formed in the surface of the rectangular plate. According to the invention, reliable fixation of the gas pipe and the sensor connecting pipe can be realized, connecting pipe loosening and gas leakage caused by operation vibration of an oxygen generator or gas flow pressure fluctuation are reduced, a stable gas flow pressure difference environment required by detection of the differential pressure flow sensor is ensured, and distortion of a flow detection signal is prevented.

Description

Technical Field

[0001] This invention relates to the field of oxygen concentrator technology, specifically to a differential pressure flow sensor for a medical oxygen concentrator. Background Technology

[0002] Medical oxygen concentrators are devices that produce high concentrations of oxygen using air separation technology. They are widely used in medical institutions and home oxygen therapy to provide oxygen support for patients with respiratory and cardiovascular diseases. Flow monitoring is the core link to ensure the safety of oxygen supply. The differential pressure flow sensor of a medical oxygen concentrator is a key detection component of the device. By monitoring the pressure difference generated when oxygen flows through a specific structure, the differential pressure signal is converted into an electrical signal and transmitted to the control system to achieve accurate flow measurement and real-time monitoring. It usually has temperature compensation and low zero-point drift characteristics. When the flow is abnormal, it can trigger an alarm to avoid insufficient or excessive oxygen supply. It is an important component to ensure the effect of oxygen therapy and the safety of patients. However, when the differential pressure flow sensor is connected to the oxygen concentrator's air pipe, vibrations generated during the operation of the oxygen concentrator, such as compressor vibrations, minor collisions during equipment handling, or long-term airflow pressure fluctuations, can easily cause axial displacement or radial loosening at the pipe connection. This can lead to connection seal failure and gas leakage. The leakage will directly disrupt the stable airflow pressure difference environment required for the differential pressure flow sensor to detect the flow, causing distortion of the flow detection signal output by the sensor. This can then cause the oxygen concentrator's control system to misjudge the oxygen supply status, triggering abnormal adjustments to the oxygen supply concentration or unnecessary shutdown protection, thus affecting the patient's normal oxygen use. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a differential pressure flow sensor for medical oxygen concentrators. This solves the problem that existing differential pressure flow sensors, when connected to the oxygen concentrator's tubing, are prone to axial displacement or radial loosening at the connection point due to vibrations generated during oxygen concentrator operation (such as compressor vibrations, minor collisions during equipment handling, or long-term airflow pressure fluctuations). This leads to seal failure and gas leakage, directly disrupting the stable airflow pressure differential environment required for sensor detection. This distortion causes the sensor's output flow detection signal to be inaccurate, resulting in the oxygen concentrator control system misjudging the oxygen supply status, triggering abnormal oxygen concentration adjustments or unnecessary shutdown protection, and ultimately affecting the patient's normal oxygen use.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A differential pressure flow sensor for a medical oxygen concentrator, comprising a base plate, a sensor, a connecting pipe, an air tube, and a stabilizing device. The sensor is fixed to the upper surface of the base plate, the connecting pipe is fixed to the upper surface of the sensor, the air tube is inserted into the upper surface of the connecting pipe, and the stabilizing device is disposed on the upper surface of the sensor. The stabilizing device includes a column fixed to the upper surface of the sensor. A rectangular plate is fixedly connected to the top of the column. A mounting plate is fixedly connected to the upper surface of the rectangular plate. A threaded rod is rotatably connected to the surface of the mounting plate, and a knob is fixedly connected to the surface of the threaded rod. A sliding hole is formed on the surface of the rectangular plate, and a clamping ring is slidably connected to the inner wall of the sliding hole on the surface of the rectangular plate. One end of the sensor is fixedly connected to a bracket, and a sleeve is fixedly connected to the surface of the bracket. The sleeve and the clamping ring are symmetrically arranged. By setting a stabilizing device, the air tube and the sensor connection can be reliably fixed, reducing the loosening of the connection and gas leakage caused by vibration of the oxygen concentrator or fluctuation of airflow pressure. This ensures a stable airflow pressure difference environment required for differential pressure flow sensor detection, prevents distortion of flow detection signals, and reduces oxygen supply abnormalities or shutdown protection caused by misjudgment of oxygen supply status by the oxygen concentrator control system, ensuring stable oxygen use for patients. At the same time, fixing and disassembling can be completed by simply turning the knob forward and backward. The operation is simple and does not require complicated tools, reducing equipment maintenance costs and operational complexity. It can also reduce wear on the connection interface caused by long-term loosening and extend the service life of the sensor and air tube components.

[0005] Preferably, one end of the clamping ring is fixedly connected to a threaded sleeve, and the threaded rod is threadedly connected to the threaded sleeve. By setting the threaded rod, the rotational motion of the knob is converted into the linear motion of the threaded sleeve. The threaded sleeve is driven to move axially through the threaded transmission, thereby pushing the clamping ring closer to the clamping sleeve to clamp the air tube, or driving the threaded sleeve and clamping ring away from the clamping sleeve to release the air tube when rotating in the opposite direction. At the same time, its threaded structure can provide a self-locking effect, ensuring that the clamping ring is not easily loosened by external forces such as vibration after clamping the air tube, thereby realizing the reliable fixation and convenient disassembly of the air tube and the sensor connector, and ensuring the stable and effective clamping function of the stabilizing device.

[0006] Preferably, there are two clamping rings arranged symmetrically. A knob is fixedly connected to the middle of the threaded rod. By rotating the knob clockwise or counterclockwise, the threaded rod is rotated, which in turn drives the threaded sleeve to move. This causes the threaded sleeve to press the clamping ring closer to the clamping sleeve to hold and fix the air tube, or to move the clamping ring away from the clamping sleeve to release the air tube. This enables quick fixing and convenient disassembly of the air tube and the sensor connector, ensuring a stable connection and easy operation.

[0007] Preferably, a protective device is provided at one end of the base plate. The protective device includes a retainer, which is fixedly connected to the base plate. A retaining sleeve is rotatably connected to the surface of the retainer. A joint plate is rotatably connected to one end of the retaining sleeve. A sliding sleeve is provided at one end of the sensor. A vertical rod is slidably connected to the inner wall of the sliding sleeve. By providing the protective device, the retaining sleeve can effectively shield the pins when the sensor is not in a wiring maintenance state, preventing the pins from being damaged by collisions or contaminated by dust and impurities during transportation, storage, or use, thus ensuring the stability of the sensor circuit connection. Furthermore, pulling the vertical rod left or right can quickly expose the pins. After releasing, the shielding is automatically reset by the pressure spring and the return spring, without the need to disassemble the protective structure. The operation is convenient and efficient, without affecting the normal wiring and use of the pins, while continuously protecting the pins and extending the overall service life of the sensor.

[0008] Preferably, there are two joint plates, which are symmetrically arranged. By setting the joint plates, when the vertical rod and the sliding sleeve move, they are squeezed by the joint plates, which in turn causes the ferrule to flip, so as to open the ferrule to expose the pin or cover the pin again when resetting. This plays the role of connecting the vertical rod, the sliding sleeve and the ferrule and transmitting motion to control the opening and closing state of the ferrule.

[0009] Preferably, a pulley is rotatably connected to the lower surface of the vertical rod and the sliding sleeve. The pulley contacts the base plate. By setting the pulley, when the vertical rod and the sliding sleeve are pulled left and right, the friction during the movement of the vertical rod and the sliding sleeve is reduced through rolling contact with the vertical rod, the sliding sleeve and the mounting base. This makes the movement of the vertical rod and the sliding sleeve smoother and less strenuous, avoids jamming, and ensures that the vertical rod and the sliding sleeve can flexibly and smoothly drive the joint plate to squeeze the sleeve to complete the flip or reset under the action of the spring, thus ensuring the convenience and reliability of the protective device operation.

[0010] Preferably, the two ends of the vertical rod and the sliding sleeve are rotatably connected to the joint plates on both sides, and a pressure spring is fixedly connected to the inner wall of the sliding sleeve. The end of the pressure spring away from the sliding sleeve is fixedly connected to the vertical rod. By setting the pressure spring, when the vertical rod and the sliding sleeve are pulled left and right to expose the sensor pins, they will be in a restrained state. After the vertical rod and the sliding sleeve are released, the pressure spring can quickly release the stored elastic force and actively pull the vertical rod back to the initial position. The reset of the vertical rod will indirectly relieve the pressure on the joint plates, providing the necessary conditions for the reset spring to push the sleeve to flip and reset, and to re-cover and protect the sensor pins. This ensures that when the sensor is not in a wiring maintenance state, the pins can automatically return to the protected state without manual adjustment of the vertical rod position. This not only ensures the timeliness and continuity of protection, but also further improves the convenience of operation of the protective device. It also avoids the situation where the sleeve cannot effectively cover the pins due to the vertical rod not being able to reset, thereby preventing the pins from being exposed, damaged, or contaminated with impurities.

[0011] Preferably, a return spring is fixedly connected to one end of the sleeve, and the end of the return spring away from the sleeve is fixedly connected to the base plate. By setting the return spring, when the vertical rod and the sliding sleeve are released, the return spring generates elastic force to squeeze the sleeve, causing the sleeve to return from the flipped state exposing the pins to the initial position, and re-covering the sensor pins. This continuously protects the pins in the non-wiring maintenance state, preventing them from being damaged by collisions or contaminated by dust and impurities, which could lead to poor contact and ensure the stability of the sensor circuit connection.

[0012] Preferably, the surface of the trachea is provided with a separation device, which includes a filter screen fixed in the inner wall of the trachea. The filter screen is inclined, and one end of the trachea has a through hole. A pull rod is slidably connected to the inner wall of the through hole at one end of the trachea. The pull rod passes through the trachea and is fixedly connected to a push plate. By setting up the separation device, the filter screen can be used to filter impurities from the gas entering the sensor, preventing impurities from clogging the sensor detection channel or contaminating sensitive components. This reduces the decrease in detection accuracy and sensor malfunction caused by channel blockage. At the same time, the inclined filter screen facilitates the natural flow of impurities to the empty tube. The pull rod, together with the push plate, can actively clean impurities from the surface of the filter screen. Rotating the threaded cap can open the empty tube to clean impurities without disassembling the sensor or filter screen. Maintenance and operation are simple, and the cleanliness of the gas entering the sensor can be continuously guaranteed, maintaining the stable detection performance of the sensor, reducing the frequency of sensor repair and replacement due to impurity contamination, and lowering the cost of use.

[0013] Preferably, one end of the air tube is fixedly connected to an empty tube, and one end of the empty tube is threadedly connected to a threaded cap. The empty tube is connected to the air tube. By setting the empty tube, impurities filtered by the filter screen are prevented from accumulating on the filter screen surface or re-entering the gas flow channel to contaminate the sensor detection channel. At the same time, the empty tube provides an independent storage space for impurities, preventing impurities from adhering to the filter screen again and affecting the filtration efficiency. Furthermore, the empty tube can be easily opened by rotating the threaded cap to clean impurities without disassembling the sensor or filter screen, reducing maintenance difficulty.

[0014] In summary, the technical effects and advantages of this invention are as follows: 1. In this invention, by setting a stabilizing device, after the trachea is inserted into the connecting pipe, rotating the knob drives the threaded rod to rotate. Simultaneously, the threaded rod drives the threaded sleeve, which compresses the clamping ring until the clamping ring holds the trachea between the clamping ring and the sleeve. At this point, the trachea is difficult to move, thus completing the fixation. When it is necessary to remove the trachea, rotating the knob in the opposite direction will move the clamping ring away from the sleeve, allowing the trachea to be pulled out. By setting a stabilizing device, reliable fixation of the trachea and sensor connecting pipe can be achieved, reducing the loosening of the connecting pipe and gas leakage caused by vibration of the oxygen concentrator or fluctuations in airflow pressure. This ensures a stable airflow pressure differential environment required for differential pressure flow sensor detection, preventing distortion of the flow detection signal. This, in turn, reduces oxygen supply abnormalities or shutdown protection caused by misjudging the oxygen supply status in the oxygen concentrator control system, ensuring stable oxygen supply for patients. Furthermore, fixing and disassembling can be completed by simply rotating the knob in both directions, making operation simple and requiring no complex tools. This reduces equipment maintenance costs and operational complexity, and also reduces wear on the connecting pipe interface caused by long-term loosening, extending the service life of the sensor and trachea components.

[0015] 2. In this invention, by setting up a protective device, the vertical rod and sliding sleeve are pulled left and right. The vertical rod and sliding sleeve move in conjunction with the pulley. During the movement, the vertical rod and sliding sleeve press against the joint plate. The joint plate causes the retaining sleeve to flip, at which point the sensor pins are exposed. When the vertical rod and sliding sleeve are released, the pressure spring loses its restraint and generates elastic force to pull the vertical rod back to its original position. At the same time, the return spring presses the retaining sleeve back to its original position and re-covers and protects the pins. By setting up a protective device, the retaining sleeve can effectively cover the pins in the non-wiring maintenance state of the sensor, preventing the pins from being damaged by collisions or contaminated by dust and impurities during transportation, storage, or use, thus ensuring the stability of the sensor circuit connection. Moreover, pulling the vertical rod left and right quickly exposes the pins, and after releasing, the pressure spring and return spring automatically reset the cover. There is no need to disassemble the protective structure, making the operation convenient and efficient. It does not affect the normal wiring and use of the pins, and can continuously protect the pins, extending the overall service life of the sensor.

[0016] 3. In this invention, by setting up a separation device, when gas is injected into the sensor through the gas tube, the gas passes through a filter screen, which filters out impurities in the gas. The gas then passes through the filter screen and enters the sensor. Because the filter screen is set at an angle, impurities will flow into the empty tube, or squeeze the pull rod, which drives the push plate to push the impurities on the surface of the filter screen into the empty tube. The empty tube can be opened by rotating the threaded cap. By setting up a separation device, the filter screen can be used to filter impurities in the gas entering the sensor, preventing impurities from clogging the sensor detection channel or contaminating sensitive components, reducing the decrease in detection accuracy and sensor failure caused by channel blockage. At the same time, the angled filter screen facilitates the natural flow of impurities into the empty tube. With the pull rod driving the push plate, impurities on the surface of the filter screen can be actively cleaned. The empty tube can be opened by rotating the threaded cap to clean the impurities. There is no need to disassemble the sensor or filter screen, making maintenance and operation simple. It can continuously ensure the cleanliness of the gas entering the sensor, maintain the stability of the sensor detection performance, reduce the frequency of sensor maintenance and replacement due to impurity contamination, and reduce the cost of use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a differential pressure flow sensor for a medical oxygen concentrator according to the present invention; Figure 2 This is a side view schematic diagram of the differential pressure flow sensor for a medical oxygen concentrator according to the present invention; Figure 3 This is a schematic diagram of the stabilization device for a differential pressure flow sensor in a medical oxygen concentrator according to the present invention. Figure 4 This is a schematic diagram of the protective device structure for a differential pressure flow sensor in a medical oxygen concentrator according to the present invention; Figure 5 This invention relates to a differential pressure flow sensor for a medical oxygen concentrator. Figure 4 A magnified structural diagram at point A; Figure 6 This is a schematic diagram of the separation device structure of a differential pressure flow sensor for a medical oxygen generator according to the present invention.

[0018] In the diagram: 1. Base plate; 2. Sensor; 3. Connecting pipe; 4. Air pipe; 5. Stabilizing device; 51. Column; 52. Bracket; 53. Clip; 54. Clamping ring; 55. Rectangular plate; 56. Mounting plate; 57. Threaded sleeve; 58. Threaded rod; 59. Knob; 6. Protective device; 61. Slip sleeve; 62. Vertical rod; 63. Sliding sleeve; 64. Pulley; 65. Pressure spring; 66. Return spring; 67. Joint plate; 68. Card seat; 7. Separation device; 71. Pull rod; 72. Push plate; 73. Filter screen; 74. Empty pipe; 75. Threaded cap. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] refer to Figures 1-6 The differential pressure flow sensor for a medical oxygen concentrator shown includes a base plate 1, a sensor 2, a connecting pipe 3, an air tube 4, and a stabilizing device 5. The sensor 2 is fixed to the upper surface of the base plate 1, the connecting pipe 3 is fixed to the upper surface of the sensor 2, the air tube 4 is inserted into the upper surface of the connecting pipe 3, and the stabilizing device 5 is disposed on the upper surface of the sensor 2. The stabilizing device 5 includes a column 51, which is fixed to the upper surface of the sensor 2. A rectangular plate 55 is fixedly connected to the top of the column 51, and a mounting plate 56 is fixedly connected to the upper surface of the rectangular plate 55. A threaded rod 58 is rotatably connected to the surface of the mounting plate 56, and a knob 59 is fixedly connected to the surface of the threaded rod 58. A sliding hole is formed on the surface of the rectangular plate 55, and a clamping ring 54 is slidably connected to the inner wall of the sliding hole on the surface of the rectangular plate 55. One end of the sensor 2 is fixed. A bracket 52 is connected, and a sleeve 53 is fixedly connected to the surface of the bracket 52. The sleeve 53 and the clamping ring 54 are symmetrically arranged. By setting the stabilizing device 5, the air tube 4 and the sensor 2 connecting pipe 3 can be reliably fixed, reducing the loosening of the connecting pipe 3 and gas leakage caused by vibration of the oxygen concentrator or fluctuation of airflow pressure. This ensures a stable airflow pressure difference environment required for the differential pressure flow sensor 2 to detect, prevents the flow detection signal from being distorted, and reduces the oxygen supply abnormality or shutdown protection caused by the oxygen concentrator control system misjudging the oxygen supply status, ensuring stable oxygen use for patients. At the same time, the forward and reverse knob 59 can be used to fix and disassemble the device. The operation is simple and does not require complicated tools, reducing equipment maintenance costs and operational complexity. It can also reduce wear caused by long-term loosening of the connecting pipe 3 interface and extend the service life of the sensor 2 and air tube 4 components.

[0021] One end of the clamping ring 54 is fixedly connected to a threaded sleeve 57, and the threaded rod 58 is threadedly connected to the threaded sleeve 57. By setting the threaded rod 58, the rotational motion of the knob 59 is converted into the linear motion of the threaded sleeve 57. Through the threaded transmission, the threaded sleeve 57 is driven to move axially, thereby pushing the clamping ring 54 closer to the clamping sleeve 53 to clamp the air tube 4, or when rotating in the opposite direction, it drives the threaded sleeve 57 and the clamping ring 54 away from the clamping sleeve 53 to release the air tube 4. At the same time, its threaded structure can provide a self-locking effect, ensuring that the clamping ring 54 is not easy to loosen due to external forces such as vibration after clamping the air tube 4, thereby realizing the reliable fixation and convenient disassembly of the air tube 4 and the sensor 2 connecting pipe 3, and ensuring the stable and effective clamping function of the stabilizing device 5.

[0022] There are two clamping rings 54, which are symmetrically arranged. A knob 59 is fixedly connected to the middle of the threaded rod 58. By rotating the knob 59 forward or backward, the threaded rod 58 is rotated, which in turn drives the threaded sleeve 57 to move. The threaded sleeve 57 squeezes the clamping ring 54 closer to the clamping sleeve 53 to clamp and fix the air tube 4, or moves the clamping ring 54 away from the clamping sleeve 53 to release the air tube 4. This enables the air tube 4 to be quickly fixed and easily disassembled from the sensor 2 connecting pipe 3, ensuring a stable connection and simple operation.

[0023] The base plate 1 has a protective device 6 at one end, which includes a retainer 68 fixedly connected to the base plate 1. A retainer 61 is rotatably connected to the surface of the retainer 68, and a joint plate 67 is rotatably connected to one end of the retainer 61. A sliding sleeve 63 is provided at one end of the sensor 2, and a vertical rod 62 is slidably connected to the inner wall of the sliding sleeve 63. By setting the protective device 6, the retainer 61 can effectively shield the pins when the sensor 2 is not in a wiring maintenance state, preventing the pins from being damaged by collisions or contaminated by dust and impurities during transportation, storage or use, thus ensuring the stability of the circuit connection of the sensor 2. The pins can be quickly exposed by pulling the vertical rod 62 left and right. After releasing, the shielding is automatically reset by the pressure spring 65 and the return spring 66. There is no need to disassemble the protective structure, making the operation convenient and efficient. It does not affect the normal wiring and use of the pins, and can continuously protect the pins, extending the overall service life of the sensor 2.

[0024] There are two joint plates 67, which are symmetrically arranged. When the vertical rod 62 and the sliding sleeve 63 move, they are squeezed by the joint plates 67, which in turn causes the retaining sleeve 61 to flip. This allows the retaining sleeve 61 to open and expose the pins or to cover the pins again when it is reset. It serves to connect the vertical rod 62, the sliding sleeve 63 and the retaining sleeve 61 and transmit motion to control the opening and closing state of the retaining sleeve 61.

[0025] Among them, the lower surfaces of the vertical rod 62 and the sliding sleeve 63 are rotatably connected to a pulley 64. The pulley 64 contacts the base plate 1. By setting the pulley 64, when the vertical rod 62 and the sliding sleeve 63 are pulled left and right, the friction of the vertical rod 62 and the sliding sleeve 63 during the movement is reduced through rolling contact with the vertical rod 62, the sliding sleeve 63 and the mounting base. This makes the movement of the vertical rod 62 and the sliding sleeve 63 smoother and less strenuous, avoids jamming, and ensures that the vertical rod 62 and the sliding sleeve 63 can flexibly and smoothly drive the joint plate 67 to squeeze the sleeve 61 to complete the flipping or reset under the action of the spring, thus ensuring the convenience and reliability of the operation of the protective device 6.

[0026] The vertical rod 62 and the sliding sleeve 63 are rotatably connected to the joint plates 67 on both sides. A pressure spring 65 is fixedly connected to the inner wall of the sliding sleeve 63. The end of the pressure spring 65 away from the sliding sleeve 63 is fixedly connected to the vertical rod 62. By setting the pressure spring 65, when the vertical rod 62 and the sliding sleeve 63 are pulled left and right to expose the sensor 2 pin, they will be in a restrained state. After the vertical rod 62 and the sliding sleeve 63 are released, the pressure spring 65 can quickly release the stored elastic force and actively pull the vertical rod 62 back to its initial position. The position indirectly relieves the pressure on the joint plate 67, providing the necessary conditions for the return spring 66 to push the sleeve 61 to flip and reset, and to re-cover and protect the sensor 2 pins. This ensures that when the sensor 2 is not in a wiring maintenance state, the pins can automatically return to the protected state without the need to manually adjust the position of the vertical rod 62. This not only ensures the timeliness and continuity of protection, but also further improves the ease of operation of the protective device 6. It also prevents the sleeve 61 from being unable to effectively cover the pins due to the vertical rod 62 failing to reset, thereby preventing the pins from being exposed, damaged, or contaminated with impurities.

[0027] One end of the sleeve 61 is fixedly connected to a return spring 66, and the end of the return spring 66 away from the sleeve 61 is fixedly connected to the base plate 1. By setting the return spring 66, when the vertical rod 62 and the sliding sleeve 63 are released, the return spring 66 generates elastic force to squeeze the sleeve 61, causing the sleeve 61 to return from the flipped state with exposed pins to the initial position, and re-covering the pins of the sensor 2. This continuously protects the pins in the non-wiring maintenance state, preventing them from being damaged by collisions or contaminated by dust and impurities, which could lead to poor contact and ensure the stability of the circuit connection of the sensor 2.

[0028] The gas tube 4 is equipped with a separation device 7, which includes a filter screen 73. The filter screen 73 is fixed in the inner wall of the gas tube 4 and is inclined. One end of the gas tube 4 has a through hole, and a pull rod 71 is slidably connected to the inner wall of the through hole at one end of the gas tube 4. The pull rod 71 passes through the gas tube 4 and is fixedly connected to a push plate 72. By setting up the separation device 7, the filter screen 73 can be used to filter impurities in the gas entering the sensor 2, preventing impurities from clogging the detection channel of the sensor 2 or contaminating sensitive components, reducing the decrease in detection accuracy and sensor 2 malfunction caused by channel blockage. At the same time, the inclined filter screen 73 facilitates the natural flow of impurities to the empty tube 74. With the pull rod 71 driving the push plate 72, impurities on the surface of the filter screen 73 can be actively cleaned. The empty tube 74 can be opened by rotating the threaded cover 75 to clean impurities without disassembling the sensor 2 or the filter screen 73. The maintenance and operation are simple, which can continuously ensure the cleanliness of the gas entering the sensor 2, maintain the stable detection performance of the sensor 2, reduce the frequency of sensor 2 maintenance and replacement due to impurity contamination, and reduce the cost of use.

[0029] One end of the air tube 4 is fixedly connected to an empty tube 74, and the other end of the empty tube 74 is threadedly connected to a threaded cap 75. The empty tube 74 is connected to the air tube 4. By setting the empty tube 74, the impurities filtered by the filter screen 73 are prevented from accumulating on the surface of the filter screen 73 or re-entering the gas flow channel to contaminate the detection channel of the sensor 2. At the same time, the empty tube 74 provides an independent storage space for impurities, preventing impurities from adhering to the filter screen 73 again and affecting the filtration efficiency. Furthermore, the empty tube 74 can be easily opened by rotating the threaded cap 75 to clean the impurities without disassembling the sensor 2 or the filter screen 73, thus reducing the difficulty of maintenance.

[0030] Working principle of this invention: By setting up a stabilizing device 5, after the air tube 4 is inserted into the connecting pipe 3, rotating the knob 59 causes the threaded rod 58 to rotate. Simultaneously, the threaded rod 58 rotates, causing the threaded sleeve 57 to move. The threaded sleeve 57 compresses the clamping ring 54 until the clamping ring 54 clamps the air tube 4 between the clamping sleeve 53 and the clamping ring 54. At this point, the air tube 4 is difficult to move, thus achieving fixation. When it is necessary to remove the air tube 4, rotating the knob 59 in the opposite direction will move the clamping ring 54 away from the clamping sleeve 53, allowing the air tube 4 to be pulled out. By setting up the stabilizing device 5, the air tube 4 and the connecting pipe 3 of the sensor 2 can be reliably connected. By fixing the pipe, the vibration of the oxygen concentrator or the airflow pressure fluctuation caused by the operation of the oxygen concentrator can be reduced, which may lead to loosening of the pipe 3 and gas leakage. This ensures a stable airflow pressure difference environment required for the differential pressure flow sensor 2 to detect the flow rate and prevents the flow detection signal from being distorted. In this way, the oxygen supply abnormality or shutdown protection caused by the oxygen concentrator control system misjudging the oxygen supply status can be reduced, ensuring stable oxygen supply for patients. At the same time, fixing and disassembling can be completed by turning the forward and reverse knob 59. The operation is simple and does not require complicated tools, which reduces the equipment maintenance cost and operation complexity. It can also reduce the wear of the pipe 3 interface caused by long-term loosening and extend the service life of the sensor 2 and the air pipe 4. By setting up the protective device 6, the vertical rod 62 and the sliding sleeve 63 are pulled left and right. The vertical rod 62 and the sliding sleeve 63 move in conjunction with the pulley 64. During the movement, the vertical rod 62 and the sliding sleeve 63 press the joint plate 67. The joint plate 67 drives the retaining sleeve 61 to flip. At this time, the pins of the sensor 2 are exposed. When the vertical rod 62 and the sliding sleeve 63 are released, the pressure spring 65 loses its restraint and generates elastic force to pull the vertical rod 62 back to its original position. At the same time, the return spring 66 presses the retaining sleeve 61 to reset and re-cover the pins for protection. By setting up the protective device 6, the retaining sleeve 61 can effectively cover the pins in the non-wiring maintenance state of the sensor 2, preventing the pins from being damaged by collisions or contaminated by dust and impurities during transportation, storage or use, thus ensuring the stability of the circuit connection of the sensor 2. Moreover, pulling the vertical rod 62 left and right can quickly expose the pins. After releasing, the pressure spring 65 and the return spring 66 automatically reset the cover. There is no need to disassemble the protective structure. The operation is convenient and efficient. It does not affect the normal wiring and use of the pins, and can continuously protect the pins and extend the overall service life of the sensor 2. By setting up the separation device 7, when gas is injected into sensor 2 through gas pipe 4, the gas passes through filter screen 73, which filters out impurities in the gas. The gas then passes through filter screen 73 and enters sensor 2. Because filter screen 73 is tilted, impurities flow into empty pipe 74. Alternatively, by squeezing pull rod 71, pull rod 71 drives push plate 72, pushing impurities on the surface of filter screen 73 into empty pipe 74. Rotating threaded cap 75 opens empty pipe 74. By setting up the separation device 7, filter screen 73 can be used to filter impurities from the gas entering sensor 2, preventing impurities from clogging sensor 2. The detection channel or sensitive components are contaminated, reducing the decrease in detection accuracy and sensor 2 malfunction caused by channel blockage. At the same time, the inclined filter screen 73 facilitates the natural flow of impurities to the empty tube 74. With the help of the pull rod 71, the push plate 72 can actively clean the impurities on the surface of the filter screen 73. Rotating the threaded cover 75 can open the empty tube 74 to clean the impurities. There is no need to disassemble the sensor 2 or the filter screen 73, which simplifies maintenance and operation. It can continuously ensure the cleanliness of the gas entering the sensor 2, maintain the stable detection performance of the sensor 2, reduce the frequency of sensor 2 maintenance and replacement due to impurity contamination, and reduce the cost of use.

[0031] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power, and the main controller can be a conventional known device such as a computer that can control it.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A differential pressure flow sensor for a medical oxygen concentrator, comprising a base plate (1), a sensor (2), a connecting pipe (3), an air pipe (4), and a stabilizing device (5), characterized in that: The sensor (2) is fixed to the upper surface of the base plate (1), the connecting pipe (3) is fixed to the upper surface of the sensor (2), the air pipe (4) is inserted into the upper surface of the connecting pipe (3), and the stabilizing device (5) is set on the upper surface of the sensor (2). The stabilizing device (5) includes a column (51), which is fixed to the upper surface of the sensor (2). A rectangular plate (55) is fixedly connected to the top of the column (51), and a mounting plate is fixedly connected to the upper surface of the rectangular plate (55). Mounting plate (56), the surface of mounting plate (56) is rotatably connected to threaded rod (58), the surface of threaded rod (58) is fixedly connected to knob (59), the surface of rectangular plate (55) is provided with sliding hole, the inner wall of sliding hole on the surface of rectangular plate (55) is slidably connected to clamping ring (54), one end of sensor (2) is fixedly connected to bracket (52), the surface of bracket (52) is fixedly connected to sleeve (53), the sleeve (53) and clamping ring (54) are symmetrically arranged.

2. The differential pressure flow sensor for a medical oxygen concentrator according to claim 1, characterized in that: One end of the clamping ring (54) is fixedly connected to a threaded sleeve (57), and the threaded rod (58) is threadedly connected to the threaded sleeve (57).

3. The differential pressure flow sensor for a medical oxygen concentrator according to claim 2, characterized in that: There are two clamping rings (54), which are arranged symmetrically, and a knob (59) is fixedly connected in the middle of the threaded rod (58).

4. The differential pressure flow sensor for a medical oxygen concentrator according to claim 1, characterized in that: A protective device (6) is provided at one end of the base plate (1). The protective device (6) includes a card holder (68), which is fixedly connected to the base plate (1). A sleeve (61) is rotatably connected to the surface of the card holder (68). A joint plate (67) is rotatably connected to one end of the sleeve (61). A sliding sleeve (63) is provided at one end of the sensor (2). A vertical rod (62) is slidably connected to the inner wall of the sliding sleeve (63).

5. A differential pressure flow sensor for a medical oxygen concentrator according to claim 4, characterized in that: There are two articulated plates (67), and the two articulated plates (67) are arranged symmetrically.

6. A differential pressure flow sensor for a medical oxygen concentrator according to claim 5, characterized in that: The vertical rod (62) and the lower surface of the sliding sleeve (63) are rotatably connected to a pulley (64), and the pulley (64) contacts the base plate (1).

7. A differential pressure flow sensor for a medical oxygen concentrator according to claim 6, characterized in that: The two ends of the vertical rod (62) and the sliding sleeve (63) are rotatably connected to the joint plates (67) on both sides respectively. A pressure spring (65) is fixedly connected to the inner wall of the sliding sleeve (63), and the end of the pressure spring (65) away from the sliding sleeve (63) is fixedly connected to the vertical rod (62).

8. A differential pressure flow sensor for a medical oxygen concentrator according to claim 7, characterized in that: One end of the sleeve (61) is fixedly connected to a return spring (66), and the end of the return spring (66) away from the sleeve (61) is fixedly connected to the base plate (1).

9. A differential pressure flow sensor for a medical oxygen concentrator according to claim 1, characterized in that: The surface of the trachea (4) is provided with a separation device (7), the separation device (7) includes a filter screen (73), the filter screen (73) is fixed in the inner wall of the trachea (4), the filter screen (73) is inclined, one end of the trachea (4) is provided with a through hole, and a pull rod (71) is slidably connected to the inner wall of the through hole at one end of the trachea (4), the pull rod (71) passes through the trachea (4) and is fixedly connected to a push plate (72).

10. A differential pressure flow sensor for a medical oxygen concentrator according to claim 9, characterized in that: One end of the trachea (4) is fixedly connected to an empty tube (74), and one end of the empty tube (74) is threadedly connected to a threaded cap (75). The empty tube (74) is connected to the trachea (4).

Images