Breathing machine and flow sensor air resistor for breathing machine

Abstract

The utility model belongs to the technical field of medical equipment, and particularly relates to a breathing machine and a flow sensor air resistor for the breathing machine. The flow sensor air resistor for the breathing machine comprises an air resistor tube and an air resistor plate, the air resistor tube is provided with an inner cavity with openings in the two axial ends, and the air resistor plate is fixed in the inner cavity and divides the inner cavity into an air inlet cavity and an air outlet cavity which are distributed in the axial direction; a plurality of air resistance holes penetrating through the two side surfaces of the air resistance plate in the thickness direction are formed in the air resistance plate, the air resistance holes comprise the first air resistance hole located in the middle of the air resistance plate and the second air resistance holes located in the periphery of the air resistance plate, and the damping of the first air resistance hole is smaller than that of the second air resistance holes; an air inlet monitoring port correspondingly communicated with the air inlet cavity and an air outlet monitoring port correspondingly communicated with the air outlet cavity are formed in the pipe wall of the air resistance pipe. A stable and ordered air flow is obtained in the air outlet cavity, so that the front and back pressure difference of the air resistance plate is obvious and stable, the pressure difference measured by the pressure sensor is accurate, and the pressure difference value fluctuation of the air resistance of the flow sensor is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, in particular to a ventilator and a flow sensor air resistance for the ventilator. Background Art

[0002] A medical positive pressure ventilation machine is a type of ventilator. Its principle is to use a turbine to extract air to provide the user with ventilation of a set flow rate. Among them, flow monitoring is a key point in the performance of the ventilator equipment. Stable and reliable flow monitoring plays a very important role in patient safety.

[0003] In order to achieve flow monitoring, the flow in the air duct of the ventilator needs to be collected. The specific method is to install a flow sensor air resistor in the air duct of the ventilator, use the flow sensor air resistor to create a pressure difference before and after the airflow, then use the pressure sensor to measure the pressure difference value, and finally calculate the gas flow through the chip.

[0004] However, the flow sensor air resistance in the existing ventilator cannot provide a stable and orderly airflow, resulting in large fluctuations in the pressure difference value of the flow sensor air resistance, resulting in poor accuracy of the pressure difference measured by the pressure sensor, and further resulting in large fluctuations in the gas flow at the ventilator terminal and a poor user experience. Utility Model Content

[0005] The technical problem to be solved by the utility model is: to provide a ventilator and a flow sensor air resistance for the ventilator in view of the problem that the pressure difference value of the flow sensor air resistance in the existing ventilator fluctuates greatly.

[0006] In order to solve the above technical problems, on the one hand, the embodiment of the utility model provides a flow sensor air resistance for a ventilator, comprising an air resistance tube and an air resistance plate, wherein the air resistance tube has an inner cavity with two axial ends open, and the air resistance plate is fixed in the inner cavity and divides the inner cavity into an air inlet cavity and an air outlet cavity distributed along the axial direction;

[0007] The air resistance plate is provided with a plurality of air resistance holes penetrating through both side surfaces in the thickness direction thereof, the plurality of air resistance holes comprising a first air resistance hole located in the middle of the air resistance plate and a plurality of second air resistance holes located at the periphery of the air resistance plate, the damping of the first air resistance hole being smaller than the damping of the second air resistance hole;

[0008] An air inlet monitoring port connected to the air inlet cavity and an air outlet monitoring port connected to the air outlet cavity are provided on the tube wall of the air resistance tube. The air inlet monitoring port is used for a pressure sensor in the ventilator to measure the pressure of the air inlet cavity, and the air outlet monitoring port is used for the pressure sensor to measure the pressure of the air outlet cavity.

[0009] Optionally, two first air resistance holes are provided, and the two air resistance holes are symmetrically distributed about the center of the air resistance plate.

[0010] Optionally, the cross-sectional shape of the first air blocking hole is a trapezoid, and the lower side of the trapezoid is arranged close to the center of the air blocking plate.

[0011] Optionally, the air blocking plate is disc-shaped, and a plurality of the second air blocking holes are spaced apart along the circumferential direction of the air blocking plate, and a side of the second air blocking hole away from the first air blocking hole penetrates the radial outer side wall of the air blocking plate.

[0012] Optionally, the cross-sectional shape of the second air blocking hole is a rectangle, and the short side of the rectangle is perpendicular to the radial outer side wall of the air blocking plate.

[0013] Optionally, the multiple air resistance holes also include a plurality of third air resistance holes located between the first air resistance holes and the second air resistance holes, the multiple third air resistance holes are spaced apart along the circumferential direction of the air resistance plate and staggered with the second air resistance holes, and the damping of the third air resistance holes is smaller than the damping of the second air resistance holes and greater than the damping of the first air resistance holes.

[0014] Optionally, the cross-sectional shape of the third air resistance hole is circular.

[0015] Optionally, both axial ends of the gas resistance tube are folded outward to form expansion openings for guiding the flow direction of gas.

[0016] In the air resistance of the flow sensor for a ventilator of the utility model, after the airflow in the air inlet cavity rushes toward the air resistance plate, the center flow velocity of the airflow is less than the edge flow velocity. Since the damping of the first air resistance hole located in the middle of the air resistance plate is less than the damping of the second air resistance hole located at the periphery of the air resistance plate, the flow velocity of the center of the airflow after flowing through the first air resistance hole with relatively small damping and the flow velocity of the edge of the airflow after flowing through the second air resistance hole with relatively large damping can be balanced, and a stable and orderly airflow is obtained in the air outlet cavity to reduce the pressure difference fluctuation of the air resistance of the flow sensor, so that the pressure difference before and after the air resistance plate is obvious and stable, which is conducive to the accurate pressure difference measured by the pressure sensor.

[0017] On the other hand, an embodiment of the utility model provides a ventilator, comprising a housing, a pressure sensor and the above-mentioned flow sensor air resistor for the ventilator, wherein an air duct for gas circulation is formed in the housing, the flow sensor air resistor for the ventilator is installed in the air duct, and the pressure sensor can measure the pressure of the air inlet cavity and the pressure of the air outlet cavity.

[0018] Optionally, an air-blocking sealing ring is further included, and the air-blocking sealing ring is arranged between the air-blocking tube and the air duct. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a ventilator provided by an embodiment of the utility model;

[0020] Figure 2 yes Figure 1 Longitudinal section of

[0021] Figure 3 yes Figure 1 Exploded diagram of

[0022] Figure 4 yes Figure 3 Schematic diagram of the structure of the air resistance of the flow sensor;

[0023] Figure 5 yes Figure 4 The main view;

[0024] Figure 6 yes Figure 4 Longitudinal section of .

[0025] The reference numerals in the specification are as follows:

[0026] 100: ventilator;

[0027] 1. Outer shell; 11. Turbine shell; 111. First pressure transmission channel; 112. Second pressure transmission channel; 12. Bottom shell; 13. Air duct; 2. Flow sensor air resistance; 21. Air resistance tube; 22. Air resistance plate; 221. First air resistance hole; 222. Second air resistance hole; 223. Third air resistance hole; 23. Air inlet cavity; 24. Air outlet cavity; 25. Air inlet monitoring port; 26. Air outlet monitoring port; 3. Pressure sensor; 31. Air inlet pressure measuring interface; 32. Air outlet pressure measuring interface; 4. Air resistance sealing ring; 5. Sensor sealing ring; 6. Turbine. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0029] like Figure 1 and Figure 2 As shown, an embodiment of the utility model provides a ventilator, including a housing 1, a pressure sensor 3 and a flow sensor air resistor for the ventilator (hereinafter referred to as the flow sensor air resistor 2), an air duct 13 for gas circulation is formed in the housing 1, and the flow sensor air resistor 2 is installed in the air duct 13.

[0030] like Figure 4 and Figure 5As shown, the flow sensor air resistance 2 includes an air resistance tube 21 and an air resistance plate 22. The air resistance tube 21 has an inner cavity with openings at both axial ends. The air resistance plate 22 is fixed in the inner cavity. The outer wall of the air resistance plate 22 is connected to the hole wall of the air resistance plate 22. The air resistance plate 22 divides the inner cavity into an air inlet cavity 23 and an air outlet cavity 24 distributed along the axial direction.

[0031] The air resistance plate 22 is provided with a plurality of air resistance holes penetrating through the two side surfaces in the thickness direction thereof, and the plurality of air resistance holes include a first air resistance hole 221 located in the middle of the air resistance plate 22 and a plurality of second air resistance holes 222 located on the periphery of the air resistance plate 22, and the damping of the first air resistance hole 221 is smaller than the damping of the second air resistance hole 222. The gas flowing in the air duct 13 flows from the air inlet cavity 23 to the air outlet cavity 24 through the air resistance holes, and the flow velocity of the gas decreases due to the resistance when flowing through the air resistance plate 22, so that a pressure difference is formed on the front and rear sides of the air resistance plate 22, wherein the air inlet cavity 23 is a high-pressure cavity and the air outlet cavity 24 is a low-pressure cavity.

[0032] An air inlet monitoring port 25 correspondingly connected to the air inlet cavity 23 and an air outlet monitoring port 26 correspondingly connected to the air outlet cavity 24 are provided on the wall of the air resistance tube 21 . The air inlet monitoring port 25 and the air outlet monitoring port 26 are located on both sides of the air resistance plate 22 .

[0033] The pressure sensor 3 has an air inlet pressure measuring interface 31 and an air outlet pressure measuring interface 32, and a sensitive element for measuring gas pressure, such as a diaphragm, is arranged at the air inlet pressure measuring interface 31 and the air outlet pressure measuring interface 32. The air inlet pressure measuring interface 31 is connected to the air inlet monitoring port 25, and the air outlet pressure measuring interface 32 is connected to the air outlet monitoring port 26, so that the pressure in the air inlet cavity 23 and the pressure in the air outlet cavity 24 can act on the sensitive element at the corresponding pressure measuring interface, so that the sensitive element produces a micro displacement proportional to the air pressure, and the electronic circuit in the pressure sensor 3 detects this change and converts and outputs a standard measurement signal of the corresponding pressure, so that the pressure difference between the air inlet cavity 23 and the air outlet cavity 24 can be obtained, and the chip in the pressure sensor 3 calculates the corresponding gas flow through the pressure difference.

[0034] Since the airflow in the air duct 13 flowing to the air inlet cavity 23 is high-speed and disordered, the central velocity of the airflow after it rushes to the air resistance plate 22 is less than the edge velocity, and the damping of the first air resistance hole 221 on the air resistance plate 22 is less than the damping of the second air resistance hole 222 located on the periphery of the air resistance plate 22. Therefore, the velocity of the center of the airflow after flowing through the first air resistance hole 221 with relatively small damping and the velocity of the edge of the airflow after flowing through the second air resistance hole 222 with relatively large damping can be balanced, and a stable and orderly airflow is obtained in the air outlet cavity 24, so that the pressure difference before and after the air resistance plate 22 is obvious and stable, which is conducive to the accurate pressure difference measurement of the pressure sensor 3, so as to reduce the pressure difference value fluctuation of the flow sensor air resistance 2, thereby improving the accuracy of the detected gas flow.

[0035] In the ventilator of the utility model, after the airflow in the air inlet cavity 23 rushes toward the air resistance plate 22, the center velocity of the airflow is less than the edge velocity. Since the damping of the first air resistance hole 221 located in the middle of the air resistance plate 22 is less than the damping of the second air resistance hole 222 located at the periphery of the air resistance plate 22, the flow velocity of the center of the airflow after passing through the first air resistance hole 221 with relatively small damping and the flow velocity of the edge of the airflow after passing through the second air resistance hole 222 with relatively large damping can be balanced, and a stable and orderly airflow is obtained in the air outlet cavity 24, so that the pressure difference before and after the air resistance plate 22 is obvious and stable, which is conducive to the accurate pressure difference measured by the pressure sensor 3, so as to reduce the pressure difference value fluctuation of the flow sensor air resistance 2, thereby improving the accuracy of the detected gas flow, thereby reducing the gas flow fluctuation of the ventilator terminal, and improving the user experience.

[0036] In one embodiment, the air blocking plate 22 is disposed perpendicular to the axial direction of the air blocking tube 21 .

[0037] In one embodiment, the air blocking hole penetrates the air blocking plate 22 along the axial direction of the air blocking tube 21 .

[0038] In one embodiment, the ratio of the length to the diameter of the air resistance tube 21 is 2:1, and the air resistance plate 22 is located in the middle of the air resistance tube 21 in the axial direction of the air resistance tube 21 .

[0039] In one embodiment, if Figure 3 As shown, the housing 1 includes a top housing (not shown) and a bottom housing 12. A turbine 6 is installed in the housing 1. The turbine 6 can draw outside air and deliver ventilation of a set flow rate to the user. The outer cover of the turbine 6 is provided with a turbine shell 11, and the turbine shell 11 is fixed on the bottom housing 12. The turbine shell 11 and the bottom housing 12 enclose an installation room for the turbine 6 to be installed and an air intake duct 13 for outside air to flow to the inlet of the turbine 6. The flow sensor air block 2 is installed in the air intake duct 13. The outside air flows through the flow sensor air block 2 and then flows to the inlet of the turbine 6.

[0040] In one embodiment, the turbine shell 11 is provided with a first pressure transmission channel 111 and a second pressure transmission channel 112 which are spaced apart. One end of the first pressure transmission channel 111 passes through the top wall of the turbine shell 11, and the other end passes through the bottom wall of the turbine shell 11 and is in correspondence with the air inlet monitoring port 25. One end of the second pressure transmission channel 112 passes through the top wall of the turbine shell 11, and the other end passes through the bottom wall of the turbine shell 11 and is in correspondence with the air outlet monitoring port 26. The pressure sensor 3 is installed on the top of the turbine shell 11, and the air inlet pressure measuring interface 31 of the pressure sensor 3 is inserted into the first pressure transmission channel 111, and the air outlet pressure measuring interface 32 is inserted into the second pressure transmission channel 112, so that the pressure sensor 3 is installed outside the turbine shell 11 for easy installation.

[0041] In one embodiment, a sensor sealing ring 5 is further included. A sealing groove is provided on the top wall of the turbine housing 11. Two raised first bosses are provided on the bottom wall of the sensor sealing ring 5. The sensor sealing ring 5 is installed in the sealing groove, and the two first bosses are respectively inserted into the first pressure transmission channel 111 and the second pressure transmission channel 112. Two grooves are provided on the sensor sealing ring 5. The inlet pressure measuring interface 31 and the outlet pressure measuring interface 32 are respectively inserted into the two grooves. The bottom wall of the groove is provided with an opening connected to the corresponding pressure transmission channel.

[0042] In one embodiment, an air-blocking sealing ring 4 is further included, and the air-blocking sealing ring 4 is disposed between the air-blocking tube 21 and the air duct 13 .

[0043] Specifically, the air resistance sealing ring 4 is sleeved on the air resistance tube 21 and contacts the inner peripheral wall of the air duct 13 to improve the sealing performance between the air resistance tube 21 and the air duct 13 .

[0044] In one embodiment, if Figure 4 As shown, the air resistance tube 21 forms an air intake monitoring interface extending radially outward at the air intake monitoring port 25 , and forms an air outlet monitoring interface protruding radially outward at the air outlet monitoring port 26 .

[0045] Two raised second bosses are provided on the outer wall of the air resistance sealing ring 4, and the two second bosses are respectively inserted into the first pressure transmission channel 111 and the second pressure transmission channel 112, and the two second bosses are both provided with through holes extending along the radial direction of the air resistance tube 21, and the air intake monitoring interface and the air outlet monitoring interface are respectively inserted into the through holes of the two second bosses.

[0046] In other embodiments, the pressure sensor 3 may be installed in the turbine housing 11 , the intake pressure measuring interface 31 of the pressure sensor 3 may be directly inserted into the intake monitoring port 25 , and the outlet pressure measuring interface 32 may be directly inserted into the outlet monitoring port 26 .

[0047] In one embodiment, two first air blocking holes 221 are provided, and the two air blocking holes are symmetrically distributed about the center of the air blocking plate 22 .

[0048] In one embodiment, the cross-sectional shape of the first air blocking hole 221 is a trapezoid, and the lower side of the trapezoid is disposed close to the center of the air blocking plate 22 .

[0049] In one embodiment, the air blocking plate 22 is disc-shaped, and a plurality of second air blocking holes 222 are spaced apart along the circumference of the air blocking plate 22 . The second air blocking holes 222 penetrate the radial outer wall of the air blocking plate 22 on one side away from the first air blocking holes 221 .

[0050] In one embodiment, the cross section of the second air blocking hole 222 is a rectangle, and the short side of the rectangle is perpendicular to the radial outer side wall of the air blocking plate 22 .

[0051] In one embodiment, the multiple air resistance holes also include a plurality of third air resistance holes 223 located between the first air resistance hole 221 and the second air resistance hole 222. The multiple third air resistance holes 223 are spaced apart along the circumferential direction of the air resistance plate 22 and staggered with the second air resistance holes 222. The damping of the third air resistance holes 223 is smaller than the damping of the second air resistance holes 222 and greater than the damping of the first air resistance holes 221.

[0052] In one embodiment, the cross-sectional shape of the third air blocking hole 223 is circular.

[0053] In one embodiment, if Figure 5 As shown, the side of the second air resistance hole 222 with a rectangular cross-sectional shape close to the center of the air resistance plate 22 includes two arc segments, which are bent toward the side of the adjacent third air resistance hole 223. The two arc segments are connected and form a sharp angle set corresponding to the interval between the two third air resistance holes 223.

[0054] In one embodiment, if Figure 6 As shown, both axial ends of the gas resistance tube 21 are folded outward to form expansion openings for guiding the flow of gas, so that the gas flows toward the gas inlet cavity 23 and out of the gas outlet cavity 24 .

[0055] In other embodiments, only one first air blocking hole 221 may be provided.

[0056] In other embodiments, the cross-sectional shape of the first air blocking hole 221 may be an ellipse or a rectangle, and two long sides of the rectangle are arranged in parallel and spaced apart along the radial direction of the air blocking plate 22 .

[0057] In other embodiments, the cross-sectional shape of the second air blocking hole 222 is a waist-shaped hole, and two long sides of the waist-shaped hole are spaced apart along the radial direction of the air blocking plate 22 .

[0058] In other embodiments, the cross-section of the air blocking plate 22 may be a polygon, such as a square, a hexagon, a dodecagon, etc. The edges and corners of the air blocking plate 22 are connected to the inner wall of the air blocking tube 21, and there is a gap between the side of the air blocking plate 22 and the inner hole wall of the air blocking tube 21 to form an air blocking hole.

[0059] In other embodiments, the third air blocking hole 223 may be an elliptical hole or a hole of other irregular shapes.

[0060] In addition, an embodiment of the utility model provides a flow sensor air resistor 2 for a ventilator, and its structure is the same as the structure of the flow sensor air resistor 2 in any of the above embodiments, which will not be repeated here.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flow sensor air resistance for a ventilator, characterized in that: It comprises an air resistance tube (21) and an air resistance plate (22), wherein the air resistance tube (21) has an inner cavity with two axial ends open, and the air resistance plate (22) is fixed in the inner cavity and divides the inner cavity into an air inlet cavity (23) and an air outlet cavity (24) distributed along the axial direction; The air blocking plate (22) is provided with a plurality of air blocking holes penetrating through the two side surfaces thereof in a thickness direction, the plurality of air blocking holes comprising a first air blocking hole (221) located in the middle of the air blocking plate (22) and a plurality of second air blocking holes (222) located on the periphery of the air blocking plate (22), and the damping of the first air blocking hole (221) is smaller than the damping of the second air blocking hole (222); An air intake monitoring port (25) correspondingly connected to the air intake cavity (23) and an air outlet monitoring port (26) correspondingly connected to the air outlet cavity (24) are provided on the tube wall of the air resistance tube (21); the air intake monitoring port (25) is used for a pressure sensor (3) in the ventilator to measure the pressure of the air intake cavity (23); and the air outlet monitoring port (26) is used for the pressure sensor (3) to measure the pressure of the air outlet cavity (24).

2. The air resistance of the flow sensor for a ventilator according to claim 1, characterized in that: Two first air blocking holes (221) are provided, and the two air blocking holes are symmetrically distributed about the center of the air blocking plate (22).

3. The air resistance of the flow sensor for a ventilator according to claim 2, characterized in that: The cross-sectional shape of the first air blocking hole (221) is a trapezoid, and the lower side of the trapezoid is arranged close to the center of the air blocking plate (22).

4. The air resistance of the flow sensor for a ventilator according to claim 1, characterized in that: The air blocking plate (22) is disc-shaped, and a plurality of the second air blocking holes (222) are spaced apart along the circumferential direction of the air blocking plate (22), and the second air blocking hole (222) penetrates the radial outer wall of the air blocking plate (22) on a side away from the first air blocking hole (221).

5. The air resistance of the flow sensor for a ventilator according to claim 4, characterized in that: The cross-sectional shape of the second air blocking hole (222) is a rectangle, and the short side of the rectangle is perpendicular to the radial outer side wall of the air blocking plate (22).

6. The air resistance of the flow sensor for a ventilator according to claim 4, characterized in that: The plurality of air resistance holes further include a plurality of third air resistance holes (223) located between the first air resistance hole (221) and the second air resistance hole (222); the plurality of third air resistance holes (223) are spaced apart along the circumferential direction of the air resistance plate (22) and are staggered with the second air resistance holes (222); the damping of the third air resistance holes (223) is smaller than the damping of the second air resistance holes (222) and larger than the damping of the first air resistance holes (221).

7. The air resistance of the flow sensor for a ventilator according to claim 6, characterized in that: The cross-sectional shape of the third air resistance hole (223) is circular.

8. The air resistance flow sensor for a ventilator according to any one of claims 1 to 7, characterized in that: The two axial ends of the gas resistance tube (21) are folded outwards to form expanded openings for guiding the flow direction of gas.

9. A ventilator, characterized in that: It comprises a housing (1), a pressure sensor (3) and a flow sensor air resistor (2) for a ventilator as claimed in any one of claims 1 to 8, wherein an air duct (13) for gas circulation is formed in the housing (1), the flow sensor air resistor (2) for a ventilator is installed in the air duct (13), and the pressure sensor (3) is capable of measuring the pressure of the air inlet cavity (23) and the pressure of the air outlet cavity (24).

10. The ventilator according to claim 9, characterized in that: It also comprises an air-blocking sealing ring (4), wherein the air-blocking sealing ring (4) is arranged between the air-blocking tube (21) and the air duct (13).

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