Air inlet structure of breathing machine

Abstract

The utility model discloses an air inlet structure of a breathing machine, which comprises an air inlet, an air inlet channel, a converging flow guide component and a flow detection device, and the air inlet and the flow detection device are respectively positioned at the upstream and the downstream of the air inlet channel; the air inlet channel comprises a first air inlet channel and a second air inlet channel, and the upstream of the first air inlet channel and the upstream of the second air inlet channel communicate with the air inlet; the first air inlet channel and the second air inlet channel are converged through the converging flow guide component, and the flow detection device is located on the downstream of the converging flow guide component. The converging and flow guiding component is used for guiding and converging airflow in the first air inlet channel and the second air inlet channel; and arc-shaped flow guide plates are arranged on the converging flow guide part corresponding to the first air inlet channel and the second air inlet channel. According to the utility model, the airflow at the position of the flow detection device has the characteristics of stability, regularity and less eddy current, the detection and control accuracy of the breathing machine is improved, and the experience effect of a curer is better.

Description

Technical Field

[0001] The utility model relates to an air inlet structure of a ventilator, belonging to the technical field of ventilators. Background Art

[0002] At present, flow detection devices such as flow sensors or differential pressure sensors have been widely used in the field of medical ventilators, mainly for detecting respiratory airflow signals. To achieve accurate measurement and control, in addition to relatively high accuracy requirements for the flow devices themselves such as flow sensors or differential pressure sensors, it is also necessary to ensure that the airflow is relatively stable, regular, and has few vortices before entering the flow device. Therefore, there will be relatively large deviations in the data read by the flow device, which has a great impact on the precise control of the ventilator.

[0003] The prior art 1 (publication number: CN206566315U) discloses a ventilator that uses a deflector to improve the stability of the intake airflow of the ventilator. However, through actual tests, it is found that in this solution, the gas flow rate in the air inlet channel is relatively large, and the effect of the deflector on improving the gas stability is still not good. Summary of the Utility Model

[0004] In order to overcome the problems existing in the prior art, the utility model provides an air inlet structure of a ventilator, which is beneficial to improving the stability of the intake airflow of the ventilator, so that the airflow has the characteristics of being stable, regular, and having few vortices before the flow sensor. The specific technical solutions are as follows.

[0005] An air inlet structure of a ventilator includes an air inlet, an air inlet channel, and a flow detection device. The air inlet and the flow detection device are respectively located at the upstream and downstream of the air inlet channel. It is characterized in that:

[0006] It further includes a confluence deflector component;

[0007] The air inlet channel includes a first air inlet channel and a second air inlet channel. The upstream of the first air inlet channel and the second air inlet channel are both communicated with the air inlet; the first air inlet channel and the second air inlet channel are confluent through the confluence deflector component, and the flow detection device is located downstream of the confluence deflector component;

[0008] The confluence deflector component is used to guide and confluence the airflow in the first air inlet channel and the second air inlet channel together; the confluence deflector component is provided with arc-shaped deflectors corresponding to the first air inlet channel and the second air inlet channel.

[0009] Further, a flow splitter is provided downstream of the air inlet. The flow splitter is used to guide the airflow in the air inlet into the first air inlet channel and the second air inlet channel. Preferably, the flow splitter has at least one arc-shaped guiding surface.

[0010] Furthermore, the confluence and diversion component further includes a linear guiding portion, which is located downstream of the arc-shaped diversion plate and is used to guide the airflow in the first air inlet passage and the second air inlet passage to move along a straight line. Preferably, the linear guiding portion is a diversion flat plate, and the diversion flat plate isolates the airflow in the first air inlet passage and the second air inlet passage. Preferably, the linear guiding portion is a cross plate, the cross section of the cross plate is in a cross shape, and the cross plate divides the airflow in the first air inlet passage and the second air inlet passage into four parts. Preferably, the linear guiding portion is a star plate, the cross section of the star plate is in a star shape, and the star plate divides the airflow in the first air inlet passage and the second air inlet passage into six parts.

[0011] Furthermore, a first drainage rib plate is further arranged in the first air inlet passage and / or the second air inlet passage, and the first drainage rib plate is located at the bend of the first air inlet passage and / or the second air inlet passage. Preferably, two or more first drainage rib plates are arranged in parallel.

[0012] Furthermore, a second drainage rib plate is further arranged in the first air inlet passage and / or the second air inlet passage, and the second drainage rib plate is adjacent to the bend of the first air inlet passage and / or the second air inlet passage and is located downstream of the bend. Preferably, two or more second drainage rib plates are arranged in parallel.

[0013] Furthermore, a soundproof chamber is included, and the soundproof chamber is communicated with the first air inlet passage and / or the second air inlet passage through a gap.

[0014] Compared with the prior art, the utility model has the following beneficial effects.

[0015] 1. The existing single air inlet passage is divided into two air inlet passages, thereby reducing the gas flow rate in a single first air inlet passage and second air inlet passage, which is beneficial to reducing eddy currents.

[0016] 2. After the first air inlet passage and the second air inlet passage are guided to converge through the confluence and diversion component and then pass through the flow detection device, the airflow at the position of the flow detection device can have the characteristics of being stable, regular, and having few eddy currents, improving the accuracy of the detection and control of the ventilator and making the treatment experience better for the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is an exploded schematic view of the ventilator of the utility model;

[0018] Figure 2 is a schematic view of the air inlet structure of the ventilator of the utility model;

[0019] Figure 3It is a schematic diagram of the air flow path of the air inlet structure of the ventilator of the present utility model;

[0020] Figure 4 It is a partial schematic diagram of the confluence and diversion component of the present utility model;

[0021] Figure 5 It is a schematic diagram of the confluence and diversion component of the present utility model guiding air flow;

[0022] Figure 6 It is a partial cross-sectional view of the air inlet structure of the ventilator of the present utility model.

[0023] In the figure: ventilator housing 1, bottom shell 2, fan chamber 3, fan 3.1, air inlet 4, flow detection device 5, first air inlet channel 6, second air inlet channel 7, confluence and diversion component 8, arc-shaped diversion plate 8.1, straight guiding part 8.2, straight guiding part 8.2, shunt plate 9, straight plate side 9.1, bent plate side 9.2, air resistance piece 10, first drainage rib plate 11, second drainage rib plate 12, sound insulation chamber 13, gap 13.1, wall 13.2. Detailed implementation mode

[0024] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0025] Refer to Figure 1-6 , where the arrows show the direction of gas flow. The ventilator includes a ventilator housing 1, a bottom shell 2 and a fan chamber 3, and the fan chamber is located inside the housing 1 and the bottom shell 2. The air inlet structure of the ventilator includes an air inlet 4, an air inlet channel and a flow detection device 5, and the air inlet 4 and the flow detection device 5 are respectively located upstream and downstream of the air inlet channel;

[0026] The air inlet channel includes a first air inlet channel 6 and a second air inlet channel 7, and the upstream of both the first air inlet channel 6 and the second air inlet channel 7 is communicated with the air inlet 4; the first air inlet channel 6 and the second air inlet channel 7 are confluent through a confluence and diversion component 8, and the flow detection device 5 is located downstream of the confluence and diversion component 8;

[0027] The confluence and diversion component 8 is used to guide and confluence the air flows in the first air inlet channel 6 and the second air inlet channel 7 together; the confluence and diversion component 8 is provided with arc-shaped diversion plates 8.1 corresponding to both the first air inlet channel 6 and the second air inlet channel 7.

[0028] Among them, a fan 3.1 is arranged in the fan chamber 3, and a sound insulation structure (such as sound insulation cotton) is arranged in the fan chamber 3.

[0029] In this embodiment, the upstream and downstream are defined relative to the gas flow path, and the gas (air) flows from the upstream along the air inlet passage to the downstream. The air inlet 4 is a sleeve component, and the air outside the ventilator enters the interior of the ventilator through the air inlet 4 under the suction force of the fan 3.1. The flow rate detection device 5 is used to detect the gas flow rate, usually a flow sensor or a differential pressure sensor, which is prior art in the field of ventilator technology.

[0030] Further, a flow dividing plate 9 is provided downstream of the air inlet 4. The flow dividing plate 9 is used to divide the air flow in the air inlet 4 into two streams and guide them into the first air inlet passage 6 and the second air inlet passage 7. As Figure 2 shown, the flow dividing plate 16 includes a straight plate side 9.1 and a bent plate side 9.2 (with an arc-shaped guiding surface). The straight plate side 9.1 is provided to allow the air entering from the air inlet 4 to directly enter the second air inlet passage 7; the bent plate side 9.2 is provided to prevent the air entering the first air inlet passage 6 from forming a vortex at the right angle and enable the air flow to evenly flow into the first air inlet passage 6. Those skilled in the art can understand that according to the different layouts of the first air inlet passage 6, the second air inlet passage 7 and the air inlet 4, the flow dividing plate 9 can be arranged in various forms. Preferably, the flow dividing plate 9 has at least one arc-shaped guiding surface to guide the air flow in the air inlet 4 into the first air inlet passage 6 and the second air inlet passage 7, and keep the air flows in the first air inlet passage 6 and the second air inlet passage 7 approximately equal as much as possible.

[0031] As Figures 3-6 shown, the converging and guiding component 8 further includes a straight guiding portion 8.2. The straight guiding portion 8.2 is located downstream of the arc-shaped guiding plate 8.1. Preferably, the arc-shaped guiding plate 8.1 and the straight guiding portion 8.2 are integrally formed. The straight guiding portion 8.2 is used to guide the air flows in the first air inlet passage 6 and the second air inlet passage 7 to move along a straight line. A wind resistance piece 10 is provided downstream of the air inlet passage. The flow rate detection device 5 is connected to the upstream and downstream of the wind resistance piece 10 respectively. Specifically, the wind resistance piece 10 is provided downstream of the straight guiding portion 8.2, and collection holes are provided upstream and downstream of the wind resistance piece 10. The flow rate detection device 5 is connected to the two collection holes. Figure 6 The wind resistance piece 10 in [[ ]] is located inside the fan housing 3, but those skilled in the art can understand that the wind resistance piece 10 can also be located outside the fan housing 3. Although Figures 3-6 the straight guiding portion 8.2 in [[ ]] extends vertically upward, those skilled in the art can understand that the straight guiding portion 8.2 can also extend in other directions.

[0032] In one embodiment, as Figure 4As shown, the linear guiding part 8.2 is a diversion flat plate. The diversion flat plate separates the airflows in the first air inlet passage 6 and the second air inlet passage 7. The airflows in the first air inlet passage 6 and the second air inlet passage 7 converge after passing through the linear guiding part 8.2.

[0033] In one embodiment, as Figure 2 , Figure 3 , Figure 6 shown, the linear guiding part 8.2 is a cross plate. The cross section of the cross plate is in a cross shape. The cross plate divides the airflows in the first air inlet passage 6 and the second air inlet passage 7 into four parts (wherein the airflows in the first air inlet passage 6 and the second air inlet passage 7 are respectively divided into two parts). The four parts of airflows converge after passing through the cross plate. The airflows in each part will move roughly linearly along the cross plate, avoiding the eddy current caused by the instability of the local airflow. Those skilled in the art can understand that: the linear guiding part 8.2 can be a star plate, the cross section of the star plate is in a star shape, and the star plate divides the airflows in the first air inlet passage 6 and the second air inlet passage 7 into six parts; or the linear guiding part 8.2 is a structure in other centrosymmetric forms.

[0034] Further, as Figures 2-3 shown, a first diversion rib plate 11 is further arranged in the second air inlet passage 7. The first diversion rib plate 11 is located at the bend of the first air inlet passage 6 and / or the second air inlet passage 7. Preferably, two or more first diversion rib plates 11 are arranged in parallel. Here, being arranged in parallel means that the distance between them is roughly the same, and it doesn't mean they can't be bent. When bent, they also have corresponding arcs. Such an arrangement can ensure that the air entering the second air inlet passage 7 doesn't concentrate on the outer side of the corner to form an eddy current, but flows evenly downstream, ensuring uniform gas distribution in the flow channel. Those skilled in the art can understand that similar first diversion rib plates 11 can also be arranged in the first air inlet passage 6.

[0035] Further, as Figures 2-3 shown, second diversion rib plates 12 are further arranged in the first air inlet passage 6 and the second air inlet passage 7. The second diversion rib plates 12 are adjacent to the bends of the first air inlet passage 6 and the second air inlet passage 7. The second diversion rib plates 12 can be located upstream and / or downstream of the bends adjacent to them. Preferably, two or more second diversion rib plates 12 are arranged in parallel. The arrangement of the second diversion rib plates 12 can make the airflow distribution more uniform and prevent the appearance of eddy currents downstream of the bends.

[0036] Further, as Figure 3As shown in the figure, it includes an anechoic chamber 13, and the anechoic chamber 13 is connected to the first air inlet passage 6 through a gap 13.1. According to the Helmholtz noise reduction principle, the first air inlet passage 6 can be regarded as the main duct, and this gap 13.1 can be regarded as the neck. When the incident sound wave propagates in the first air inlet passage 6 and reaches the gap 13.1, part of the sound wave is reflected back, and the other part is divided into two paths. One path of the sound wave enters the anechoic chamber 13, causing the air in the anechoic chamber 13 to move and be converted into other energy and dissipated. The other path of the sound wave continues to propagate in the first air inlet passage 6 to form a transmitted wave. Optionally, the wall 13.2 between the first air inlet passage 6 and the anechoic chamber 13 extends leftward from the top to form an extension plate parallel to the gap 13.1, so as to extend the length of the gap 13.1 and increase the noise reduction effect of the anechoic chamber 13.

[0037] The first air inlet passage 6, the second air inlet passage 7 and the anechoic chamber 13 can all be formed by structures such as a housing and / or sound-absorbing cotton, etc., which will not be elaborated here.

[0038] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. Without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the purpose of the present invention and the scope protected by the claims. All these are within the protection scope of the present invention.

Claims

1. An air inlet structure of a ventilator, comprising an air inlet (4), an air inlet channel and a flow detection device (5), wherein the air inlet (4) and the flow detection device (5) are respectively located upstream and downstream of the air inlet channel, and characterized in that: It also includes a converging and guiding component (8); The air inlet channel comprises a first air inlet channel (6) and a second air inlet channel (7), wherein the upstream of the first air inlet channel (6) and the second air inlet channel (7) are both connected to the air inlet (4); the first air inlet channel (6) and the second air inlet channel (7) are merged through the merging guide component (8), and the flow detection device (5) is located downstream of the merging guide component (8); The merging guide component (8) is used to guide and merge the airflows in the first air inlet channel (6) and the second air inlet channel (7); the merging guide component (8) is provided with arc-shaped guide plates (8.1) corresponding to the first air inlet channel (6) and the second air inlet channel (7).

2. The air inlet structure of a ventilator according to claim 1, characterized in that: A splitter plate (9) is provided downstream of the air inlet (4), and the splitter plate (9) is used to guide the airflow in the air inlet (4) to the first air inlet channel (6) and the second air inlet channel (7).

3. The air inlet structure of a ventilator according to claim 2, characterized in that: The diverter plate (9) has at least one arc-shaped guide surface.

4. The air inlet structure of a ventilator according to claim 1, characterized in that: The converging guide component (8) further comprises a straight guide portion (8.2), wherein the straight guide portion (8.2) is located between the arc-shaped guide plate ( 8.1), the straight line guide portion (8.2) is used to guide the airflow in the first air inlet channel (6) and the second air inlet channel (7) to move along a straight line.

5. The air inlet structure of a ventilator according to claim 4, characterized in that: The straight guide portion (8.2) is a guide plate, and the guide plate isolates the airflow in the first air inlet channel (6) and the second air inlet channel (7).

6. The air inlet structure of a ventilator according to claim 4, characterized in that: The linear guide portion (8.2) is a cross plate, the cross-section of the cross plate is cross-shaped, and the cross plate divides the airflow in the first air inlet channel (6) and the second air inlet channel (7) into four parts; Alternatively, the linear guide portion (8.2) is a cross-sectional plate having a cross-sectional shape, and the cross-sectional plate divides the airflow in the first air inlet channel (6) and the second air inlet channel (7) into six parts.

7. The air inlet structure of a ventilator according to claim 4, characterized in that: A wind resistance sheet (10) is provided downstream of the air inlet channel, and the flow detection device (5) is respectively connected to the upstream and downstream of the wind resistance sheet (10).

8. The air inlet structure of a ventilator according to claim 1, characterized in that: A first drainage rib plate (11) is also provided in the first air inlet channel (6) and / or the second air inlet channel (7), and the first drainage rib plate (11) is located at a bend of the first air inlet channel (6) and / or the second air inlet channel (7), and more than two first drainage rib plates (11) are provided in parallel.

9. The air inlet structure of a ventilator according to claim 1, characterized in that: A second drainage rib plate (12) is also provided in the first air inlet channel (6) and / or the second air inlet channel (7), the second drainage rib plate (12) is adjacent to the bend of the first air inlet channel (6) and / or the second air inlet channel (7), and more than two second drainage rib plates (12) are provided in parallel.

10. The air inlet structure of a ventilator according to claim 1, characterized in that: It comprises a muffler chamber (13), wherein the muffler chamber (13) is connected to the first air inlet channel (6) and / or the second air inlet channel (7) via a gap (13.1).

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