Airflow stabilizing device and breathing machine

Abstract

The utility model provides an airflow stabilizing device and a breathing machine. The whole device is of a hollow cylindrical structure. The side wall of the middle of the device is provided with an air inlet collecting port and an air outlet collecting port which are connected with the flow sensor. The inner wall of the device is provided with an air outlet extension tunnel which protrudes inwards and is of a hollow columnar structure, and the axis direction of the air outlet extension tunnel is parallel to the axis of the device. The starting end of the air outlet extension tunnel is closed, is positioned between the air outlet collection port and the air inlet collection port, is adjacent to the air outlet collection port and is communicated with the air outlet collection port; the terminating end opening is positioned on the inner side of one end of the device close to the air outlet collecting opening; a hollow cylindrical central rib plate and a plurality of sheet-shaped radial rib plates are arranged in the device; and the plurality of sheet-shaped radial rib plates are radially arranged from the axis of the device to the inner wall of the device. The method has the advantages that the flow loss is small; the method is not sensitive to flow fluctuation; the device is suitable for breathing machines with small sizes; functions are not reduced, the size is reduced, and assembling is easy.

Description

Technical Field

[0001] This application belongs to the fields of ventilators and flow monitoring, and specifically relates to a stable air flow device and a ventilator. Background Art

[0002] During the use of a ventilator, by accurately monitoring the air flow rate, accurate flow output can be provided to the user, thereby achieving more precise treatment and greatly improving the user experience.

[0003] The device for measuring flow rate in a ventilator is a flow sensor. The sensor has two ports in contact with the gas, and the ports collect the gas flow rate. To ensure accurate flow rate collection, a stable data relationship, such as linearity, positive direction, etc., should be formed between the flow rate at the collection point and the flow rate at other positions. The gas collected enters from one port of the flow sensor and exits from the other port, and the signal generated during this flow process can be converted into the true flow rate value. The pipeline in the flow meter is equivalent to a bypass in the pipeline where the flow rate is collected.

[0004] To make the air flow through the flow sensor stable, a flow stabilizer block device needs to be set up. The flow stabilizer block device is generally installed in the inlet or outlet pipeline of the fan, and the flow sensor is installed on the flow stabilizer block device.

[0005] As Figure 1 shown, for the existing flow stabilizer block device, generally, after passing through multiple small grids for rectification, a buffer cavity is added around the flow sensor measurement point for sufficient turbulent flow. The defects of the existing flow stabilizer block device are as follows:

[0006] 1. To prevent the air at the inlet and outlet of the flow sensor from interfering with each other, the existing flow stabilizer block device sets the two collection holes of the flow sensor far apart, and then connects the collection ports on the flow stabilizer block to the collection ports on the sensor with pipelines. This will increase the volume of the flow stabilizer block device and make it impossible to be used in devices with a small volume.

[0007] 2. In the prior art, the axial direction of the sensor sampling port is perpendicular to the main flow direction inside the flow stabilizer block, and the two flows will interfere with each other, which will increase the difficulty of calibrating the internal signal acquisition value of the later software.

[0008] 3. The existing flow stabilizer block device will add one or several independent parts at the front end of the collection port. These parts have many rib plates with the same direction as the flow direction, dividing the overall flow stabilizer block flow channel into several small channels, and adding a flow baffle in the channel where the sensor collection port is located to force the air in this channel to pass through the flow sensor. However, this will make the structure very complex, with many parts, and also increase the air resistance of the flow stabilizer block.

[0009] With the progress of ventilator technology, the volume of ventilators is getting smaller and smaller. There is an urgent need for a stable air flow device with a small volume and a simple structure to cooperate with a flow sensor for monitoring air flow. Summary of the Invention

[0010] The purpose of this application is to overcome the defects of the existing flow stabilizer block device, such as large volume, many parts and complex structure.

[0011] To achieve the above purpose, this application proposes a stable air flow device. The device is of a hollow cylindrical structure as a whole. The inlet end of the device is connected to the outlet of the fan, and the outlet end is connected to the ventilator pipeline joint.

[0012] The air intake collection port and the air outlet collection port of the hollow cylindrical structure penetrate through the side wall in the middle of the device. The connection line of the opening centers of the air intake collection port and the air outlet collection port on the inner wall of the device is parallel to the axis of the device.

[0013] An air outlet extension tunnel protruding inward is arranged on the inner wall of the device. The air outlet extension tunnel is of a hollow cylindrical structure, and its axis direction is parallel to the axis of the device. The starting end of the air outlet extension tunnel is closed, and the ending end is open. The starting end is located between the air outlet collection port and the air intake collection port, adjacent to the air outlet collection port and communicated with the air outlet collection port. The ending end is located inside the outlet end of the device.

[0014] As an improvement of the above device, 1 hollow cylindrical central rib plate and multiple sheet-shaped radial rib plates are arranged inside the device. The axis of the cylindrical central rib plate coincides with the axis of the device. The multiple sheet-shaped radial rib plates are radially arranged from the axis of the device to the inner wall of the device, with one end connected to the central rib plate and the other end connected to the inner wall of the device.

[0015] As an improvement of the above device, the outer shell of the air outlet extension tunnel is a flow tunnel rib plate.

[0016] There are 5 radial rib plates. The angle between the two radial rib plates sandwiching the flow tunnel rib plate in the middle is 120°, and the angle between the other 4 groups of adjacent two radial rib plates is 60°.

[0017] As an improvement of the above device, the starting end of the central rib plate is located outside the inlet end of the device, protruding from the inlet end of the device, and the ending end is located inside the outlet end of the device.

[0018] The starting ends and ending ends of the sheet-shaped radial rib plates are flush with the starting end and ending end of the central rib plate.

[0019] As an improvement of the above device, the starting end of the sheet-shaped radial rib plate has a chamfer from the central rib plate to the side wall of the device.

[0020] The present application also provides a ventilator, which includes the above-mentioned stable air flow device.

[0021] Compared with the prior art, the advantages of the present application are as follows:

[0022] 1. The rib plate structure for eliminating turbulence is cancelled, which can make the flow loss smaller.

[0023] 2. The internal signal acquisition value of the flow meter is very large, and it is not sensitive to flow fluctuations.

[0024] 3. It is suitable for ventilators with smaller sizes.

[0025] 4. The flow channel and the flow stabilizing device are combined into one, with the same function, smaller size, simple assembly, and no additional production difficulties. Description of the Drawings

[0026] Figure 1 Shown is the structure diagram of the existing stable air flow device;

[0027] Figure 2 Shown is the overall structure diagram of the stable air flow device and the connected fan and ventilator pipeline;

[0028] Figure 3 Shown is the slope diagram of the stable air flow device;

[0029] Figure 4 Shown are the front, rear and side views of the stable air flow device;

[0030] Figure 5 Shown is the schematic diagram of air flow when the stable air flow device is in use; wherein, the small arrows represent the gas flow direction through the flow sensor, and the large arrows represent the gas flow direction through other positions of the stable air flow device.

[0031] Reference Signs

[0032] 1. Stable air flow device

[0033] 101. Intake air collection port 102. Exhaust air collection port

[0034] 103. Exhaust air extension tunnel 104. Exhaust air extension collection port

[0035] 105. Central rib plate 106. Radial rib plate

[0036] 107. Flow tunnel rib plate 108. Central through hole

[0037] 109. Edge through hole 110. Tunnel outer through hole

[0038] 2. Ventilator pipeline joint 3. Silicone sleeve for wrapping the pump

[0039] 4. Fan outlet 5. Flow sensor Specific implementation mode

[0040] The technical solution of the present application will be described in detail below with reference to the accompanying drawings.

[0041] Embodiment 1

[0042] As Figure 2 shown, the present application provides a stable air flow device, which is integrally a hollow cylindrical structure. Its inlet end is connected to the fan outlet 4, and its outlet end is connected to the ventilator pipeline joint 2. A pump silica gel sleeve 3 is sleeved outside the connection part between the inlet end and the fan outlet 4 for sealing.

[0043] As Figure 3 shown, a hollow cylindrical air intake collection port 101 and an air outlet collection port 102 are arranged at the middle side wall position of the stable air flow device. One end of the air intake collection port 101 and the air outlet collection port 102 penetrates through the side wall of the stable air flow device, and the other ends are respectively connected to the air inlet and the air outlet of the flow sensor 5. The connection line of the opening centers of the air intake collection port 101 and the air outlet collection port 102 on the inner wall of the stable air flow device is parallel to the axis of the stable air flow device. An inwardly protruding air outlet extension tunnel 103 is arranged on the inner side wall of the stable air flow device. The air outlet extension tunnel 103 is a hollow cylindrical structure, and its axis direction is parallel to the axis of the stable air flow device. Its starting end is closed and its ending end is open. The starting end is located between the air outlet collection port 102 and the air intake collection port 101, adjacent to the air outlet collection port 102, and is communicated with the air outlet collection port 102. The ending end is located inside the outlet end of the stable air flow device. An open air outlet extension collection port 104 is arranged between the ending end and the outlet end of the stable air flow device.

[0044] The actual pressure of the air outlet collection port 102 in the stable air flow device is approximately equal to the pressure of the air outlet extension collection port 104. As Figure 3 shown, the distance between the air intake collection port 101 and the air outlet extension collection port 104 is much larger than the distance between the air intake collection port 101 and the air outlet collection port 102, and the pressure difference will also be much larger. Such a "turning tunnel" is beneficial to increasing the internal signal acquisition value, so as to make the flow display more stable.

[0045] The direction of the air outlet extension tunnel 103 is consistent with the axis direction of the stable air flow device. Therefore, the air flow direction at the outlet of the air outlet extension tunnel 103 is parallel to the air flow direction at other positions, and there will be no too much interference with each other.

[0046] The stability of the internal signal acquisition value of the flow sensor 5 is also related to the surrounding laminar flow state. When there is too much surrounding turbulence, the fluctuation of the internal signal acquisition value will be particularly obvious. The internal rib plate of the stable air flow device provided by the present application is very close to the fan outlet 4 (asFigure 2 As shown, the size is 17.45 mm). Since the pressure at the outlet 4 of the fan is high, the wind speed is high, and the turbulence situation is very serious, some special structures are needed to form a laminar flow at the two collection ports of the stable air flow device.

[0047] As Figure 4 As shown, a "sunflower"-shaped rib plate is arranged inside the stable air flow device, including a central rib plate 105 in the shape of a hollow cylinder, five sheet-shaped radial rib plates 106, and a flow tunnel rib plate 107 forming an air outlet extension tunnel 103. The axis of the central rib plate 105 in the shape of a cylinder coincides with the axis of the stable air flow device. The five sheet-shaped radial rib plates 106 are radially arranged from the axis of the stable air flow device to the inner wall of the stable air flow device, with one end connected to the central rib plate 105 and the other end connected to the inner wall of the stable air flow device. The included angle between the radial rib plates 106 can be configured according to the effect of turbulence elimination. Preferably, the angle between the two radial rib plates 106 sandwiching the flow tunnel rib plate 107 in the middle is 120°, and the angle between the other four groups of adjacent radial rib plates 106 is 60°. The starting end of the central rib plate 105 is located outside the inlet end of the stable air flow device, protruding from the inlet end of the stable air flow device, and the terminating end is located inside the outlet end of the stable air flow device. The starting ends and terminating ends of the five sheet-shaped radial rib plates 106 are flush with the central rib plate 105, and the starting ends of the radial rib plates 106 have a chamfer from the central rib plate 105 to the side wall of the stable air flow device.

[0048] The "sunflower"-shaped rib plate forms six corresponding independent "small pipes" inside the stable air flow device, including one outer tunnel through-hole 110 between the two radial rib plates 106 sandwiching the flow tunnel rib plate 107 in the middle, four edge through-holes 109 between the other four groups of adjacent radial rib plates 106, and one central through-hole 108 formed by the central rib plate 105. The "sunflower"-shaped rib plate can effectively eliminate the turbulence interference between different pipes. There is no "blocking rib plate" in the traditional flow stabilizer block, which can effectively reduce the flow loss. The stable air flow device of the present application is suitable for ventilators with a small flow rate and can achieve the purpose of eliminating turbulence within a limited structural space.

[0049] As Figure 5 As shown, when the gas passes through the stable air flow device, a part of the gas will pass through the collection port of the flow sensor 5 (as Figure 5 the small arrows in the figure), forming a sensor bypass air flow. This part of the gas will cause the flow sensor 5 to transmit an internal signal acquisition value proportional to the bypass flow rate. Through the data processing of the host system, a flow display value is finally formed.

[0050] There needs to be a reasonable conversion relationship between the sensor bypass air flow and the overall air flow passing through the stable air flow device so that the final flow display value is within an acceptable error range. In some special cases, this flow conversion relationship should ensure a certain stability. For example, in the case of different fan speeds but the same flow rate, this conversion relationship should not change. The stable air flow device provided in this application solves this problem well.

[0051] The sensor bypass air flow cannot be too small, otherwise the relative proportion of the air flow fluctuation will be very large, and the internal signal acquisition value will also fluctuate greatly, making data acquisition impossible. To maintain a relatively large air flow in the sensor bypass, a relatively large pressure difference needs to be formed between the two acquisition ports of the flow sensor 5 to drive the sensor bypass air flow. However, the structural size of the ventilator is very small, and the selected flow sensor 5 is also very small, and the distance between the two acquisition ports of the flow sensor 5 is very short (as Figure 2 shown, the size is 4.3 mm). If the sensor acquisition ports directly extend into the stable air flow device, the formed pressure difference will be very small, while the stable air flow device provided in this application has an air outlet extension tunnel 103 that can maintain a relatively large pressure difference between the two acquisition ports, meeting the flow detection requirements of small-sized ventilators.

[0052] Embodiment 2

[0053] This application also provides a ventilator, including the above-mentioned stable air flow device.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and not to limit them. Although this application has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that any modification or equivalent replacement of the technical solutions of this application does not depart from the spirit and scope of the technical solutions of this application, and they should all be covered by the scope of the claims of this application.

Claims

1. A stable air flow device, characterized in that: The whole device is of a hollow cylindrical structure; the inlet end of the device is connected to the outlet of the fan (4), and the outlet end is connected to the ventilator pipeline joint (2); The air intake collection port (101) and the air outlet collection port (102) of the hollow cylindrical structure penetrate through the side wall in the middle of the device; the connection line of the centers of the openings of the air intake collection port (101) and the air outlet collection port (102) on the inner wall of the device is parallel to the axis of the device; An air outlet extension tunnel (103) protruding inwards is arranged on the inner wall of the device; the air outlet extension tunnel (103) is of a hollow cylindrical structure, and its axis direction is parallel to the axis of the device; the starting end of the air outlet extension tunnel (103) is closed, and the ending end is open; the starting end is located between the air outlet collection port (102) and the air intake collection port (101), adjacent to the air outlet collection port (102), and communicates with the air outlet collection port (102); the ending end is located inside the outlet end of the device.

2. The stable air flow device according to claim 1, characterized in that: One hollow cylindrical central rib plate (105) and a plurality of sheet-shaped radial rib plates (106) are arranged inside the device; the axis of the cylindrical central rib plate (105) coincides with the axis of the device; the plurality of sheet-shaped radial rib plates (106) are radially arranged from the axis of the device to the inner wall of the device, one end is connected to the central rib plate (105), and the other end is connected to the inner wall of the device.

3. The stable air flow device according to claim 2, characterized in that: The outer shell of the air outlet extension tunnel (103) is a flow tunnel rib plate (107); There are 5 radial rib plates (106); the angle between the two radial rib plates (106) sandwiching the flow tunnel rib plate (107) in the middle is 120°, and the angle between the other 4 groups of adjacent two radial rib plates (106) is 60°.

4. The stable air flow device according to claim 2 or 3, characterized in that: The starting end of the central rib plate (105) is located outside the inlet end of the device, protruding beyond the inlet end of the device, and the ending end is located inside the outlet end of the device; The starting end and the ending end of the sheet-shaped radial rib plate (106) are flush with the starting end and the ending end of the central rib plate (105).

5. The stable air flow device according to claim 4, characterized in that: The starting end of the sheet-shaped radial rib plate (106) has a chamfer from the central rib plate (105) to the side wall of the device.

6. A ventilator, characterized in that, The ventilator includes the stable air flow device according to any one of claims 1-5.

Images