Breathing machine

Abstract

The utility model discloses a breathing machine which comprises an air inlet, an air inlet channel, a flow detection device, a converging and flow guiding component and a fan bin. 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 first air inlet channel and the second air inlet channel are located below the fan bin. The confluence flow guide component guides the airflow to the flow detection device above the confluence flow guide component; 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 layout of the breathing machine is optimized, so that the breathing machine can better control noise; and meanwhile, the airflow at the position where the flow detection device is located has the characteristics of stability, regularity and few vortexes, and the detection and control accuracy of the breathing machine is improved.

Description

Technical Field

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

[0002] For portable ventilators, noise control and volume reduction are two factors that affect and restrict each other, and are also the key to the quality of portable ventilators. How to control noise while reducing volume is the focus of research and development.

[0003] 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 eddies 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 accurate control of the ventilator.

[0004] 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 deflector still has a poor effect on improving the stability of the gas. Content of the Utility Model

[0005] In order to overcome the problems existing in the prior art, the utility model provides a ventilator, which is beneficial to optimizing the structural layout of the ventilator and improving the stability of the intake airflow of the ventilator, so that the airflow has the characteristics of being stable, regular, and having few eddies before the flow sensor. The specific technical solutions are as follows.

[0006] A ventilator, comprising an air inlet, an air inlet channel, a flow detection device, and a fan chamber. The air inlet and the flow detection device are respectively located upstream and downstream of the air inlet channel. It is characterized in that:

[0007] It further comprises a confluence deflector component;

[0008] The air inlet channel comprises 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;

[0009] The first air inlet channel and the second air inlet channel are located below the fan chamber;

[0010] The confluence and diversion component is used to guide and converge the airflows in the first air inlet channel and the second air inlet channel together, and guide the airflow upward to the flow detection device; the confluence and diversion component is provided with arc-shaped diversion plates corresponding to the first air inlet channel and the second air inlet channel respectively.

[0011] By adopting the above technical solution, the layout of the ventilator is reasonably optimized. The air inlet channels (the first air inlet channel and the second air inlet channel) are arranged below the fan housing. The confluence and diversion component is used to guide the airflow below upward. After passing through the flow detection device, the airflow passes through the fan in the fan housing. Such a layout has several advantages: 1. The length of the air intake path is extended, that is, the air flow path between the air inlet and the fan is extended as low as possible, which is beneficial to reducing the fan noise discharged along the air intake path; 2. The traditional single air inlet channel is divided into two, and the first air inlet channel and the second air inlet channel can be flattened to a certain extent, and the height of the whole ventilator is reduced as much as possible while ensuring the cross-sectional area of the air intake; 3. The combination of the double air inlet channels and the confluence and diversion component is beneficial to improving the stability of the air intake airflow of the ventilator, making the airflow stable, regular and with less eddy current before entering the flow sensor.

[0012] Furthermore, the ventilator further includes a bottom case. The first air inlet channel and the second air inlet channel are located between the bottom case and the fan housing; a duct diversion block is arranged between the bottom case and the fan housing, and the first air inlet channel and the second air inlet channel are arranged around the duct diversion block. The duct diversion block is roughly located in the middle of the bottom case. By setting the external contour of the duct diversion block, the directions of the first air inlet channel and the second air inlet channel can be determined. The first air inlet channel and the second air inlet channel are arranged around the duct diversion block, which not only simplifies the design, but also extends the length of the air inlet channel. The bottom wall and the outer side wall of the first air inlet channel (the second air inlet channel) are the bottom case, the inner side wall is the duct diversion block, and the top wall is the fan housing.

[0013] Furthermore, a flow dividing plate is arranged downstream of the air inlet. The flow dividing plate is used to guide the airflow in the air inlet to the first air inlet channel and the second air inlet channel. Preferably, the flow dividing plate has at least one arc-shaped guiding surface.

[0014] Further, the confluence and diversion component further includes a linear guiding portion extending in the vertical direction. The linear guiding portion is located downstream of the arc-shaped diversion plate and is used to guide the air flow in the first air inlet passage and the second air inlet passage to move vertically upward. Preferably, the linear guiding portion is a diversion flat plate, and the diversion flat plate isolates the air flow in the first air inlet passage and the second air inlet passage. Preferably, the linear guiding portion is a cross plate, and the cross section of the cross plate is cross-shaped, and the cross plate divides the air flow in the first air inlet passage and the second air inlet passage into four parts. Preferably, the linear guiding portion is a star plate, and the cross section of the star plate is star-shaped, and the star plate divides the air flow in the first air inlet passage and the second air inlet passage into six parts.

[0015] Compared with the prior art, the utility model has the following beneficial effects.

[0016] 1. The layout of the ventilator is optimized, and the air inlet path is adjusted, so that the ventilator can better control the noise and will not cause a significant increase in the height of the ventilator.

[0017] 2. 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 the second air inlet passage, which is beneficial to reducing eddy currents.

[0018] 3. After the first air inlet passage and the second air inlet passage are guided and confluenced by the confluence and diversion component and then pass through the flow detection device, the air flow at the position where the flow detection device is located has the characteristics of being stable, regular, and having few eddy currents, improving the accuracy of detection and control of the ventilator and making the treatment experience better for the user. Description of the Drawings

[0019] Figure 1 is an exploded schematic view of the ventilator of the utility model;

[0020] Figure 2 is a schematic view of the air inlet structure of the ventilator of the utility model;

[0021] Figure 3 is a schematic view of the air flow path of the air inlet structure of the ventilator of the utility model;

[0022] Figure 4 is a partial schematic view of the confluence and diversion component of the utility model;

[0023] Figure 5 is a schematic view of the confluence and diversion component guiding the air flow of the utility model;

[0024] Figure 6 is a partial cross-sectional view of the ventilator of the utility model.

[0025] In the figure: ventilator housing 1, bottom shell 2, fan chamber 3, fan 3.1, through hole 3.2.1, air guiding member 3.2, air inlet 4, flow detection device 5, first air inlet channel 6, second air inlet channel 7, confluence and diversion member 8, arc-shaped diversion plate 8.1, linear guiding portion 8.2, linear guiding portion 8.2, flow dividing 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, air duct diversion block 14, sound-absorbing cotton 15. Detailed implementation mode

[0026] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0027] See Figures 1-6 , in which 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 3 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;

[0028] 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 converged through a confluence and diversion member 8, and the flow detection device 5 is located downstream of the confluence and diversion member 8; the first air inlet channel 6 and the second air inlet channel 7 are located below the fan chamber 3;

[0029] The confluence and diversion member 8 is used to guide and converge the air flows in the first air inlet channel 6 and the second air inlet channel 7 together, and guide the air flow upward to the flow detection device 5; the confluence and diversion member 8 is provided with arc-shaped diversion plates 8.1 corresponding to the first air inlet channel 6 and the second air inlet channel 7.

[0030] Wherein, a fan 3.1 and an air guiding member 3.2 located around the fan 3.1 are arranged in the fan chamber 3, and the air guiding member 3.2 is provided with a plurality of through holes 3.2.1, and the through holes 3.2.1 communicate the air inlet of the fan with the downstream of the air inlet channel. The gas enters the fan chamber 3 from the downstream of the air inlet channel, and converges at the air inlet of the fan 3.1 through the plurality of through holes 3.2.1 of the air guiding member 3.2 and then enters the fan 3.1.

[0031] The first air inlet passage 6 and the second air inlet passage 7 are located between the bottom shell 2 and the fan housing 3; an air duct guide block 14 is arranged between the bottom shell 2 and the fan housing 3, and the first air inlet passage 6 and the second air inlet passage 7 are arranged around the air duct guide block 14. The air duct guide block 14 is roughly located in the middle of the bottom shell 2. By setting the outer contour of the air duct guide block 14, the orientations of the first air inlet passage 6 and the second air inlet passage 7 can be determined. The first air inlet passage 6 and the second air inlet passage 7 are arranged around the air duct guide block 14, which not only simplifies the design but also extends the length of the air inlet passage. A sound-absorbing cotton 15 is arranged on the bottom shell 2, and the air duct guide block 14 is located between the sound-absorbing cotton 15 on the bottom shell 2 and the bottom of the fan housing 3. With such an arrangement, most of the walls of the first air inlet passage 6 and the second air inlet passage 7 are sound-absorbing cotton, which is beneficial to noise reduction. That is, the bottom wall of the first air inlet passage 6 (the second air inlet passage 7) is the sound-absorbing cotton 15 (which can also be the bottom shell 2) arranged on the bottom shell 2, the inner side wall is the air duct guide block 14, and the top wall is the bottom of the fan housing 3.

[0032] In this embodiment, the upstream and downstream are relative to the gas flow path, and the gas (air) flows from the upstream along the air inlet passage to the downstream. The up-down direction and the vertical direction refer to the relative positions of each component in the up-down direction when the ventilator is in use. The air inlet 4 is a sleeve component, and the air outside the ventilator enters the interior of the ventilator from the air inlet 4 under the suction force of the fan 3.1. The flow detection device 5 is used to detect the gas flow rate, usually using a flow sensor or a differential pressure sensor, which is a prior art in the technical field of ventilators.

[0033] Further, a flow dividing plate 9 is arranged downstream of the air inlet 4, and the flow dividing plate 9 is used to divide the air flow in the air inlet 4 into two strands 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.

[0034] As Figures 3-6As shown, the confluence and diversion component 8 further includes a linear guiding portion 8.2 extending in the vertical direction. The linear guiding portion 8.2 is located downstream of the arc-shaped diversion plate 8.1, and the linear guiding portion 8.2 is used to guide the airflows in the first air inlet passage 6 and the second air inlet passage 7 to move vertically upward. Preferably, the arc-shaped diversion plate 8.1 and the linear guiding portion 8.2 are integrally formed. The linear guiding portion 8.2 is used to guide the airflows in the first air inlet passage 6 and the second air inlet passage 7 to move linearly. A wind resistance piece 10 is provided downstream of the air inlet passage, and the flow rate detection device 5 is respectively connected to the upstream and downstream of the wind resistance piece 10. Specifically, the wind resistance piece 10 is provided downstream of the linear guiding portion 8.2, and collection holes are provided both upstream and downstream of the wind resistance piece 10, and the flow rate detection device 5 is connected to the two collection holes. Figure 6 The wind resistance piece 10 in it 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.

[0035] In one embodiment, as Figure 4 shown, the linear guiding portion 8.2 is a diversion flat plate, and the diversion flat plate isolates 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 together after passing through the linear guiding portion 8.2.

[0036] In one embodiment, as Figure 2 , Figure 3 , Figure 6 shown, the linear guiding portion 8.2 is a cross plate, and 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 (where 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 the airflows converge together after passing through the cross plate, and the airflows in each part will move roughly linearly along the cross plate, avoiding eddy currents caused by local airflow instability. Those skilled in the art can understand that: the linear guiding portion 8.2 can be a star plate, and 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 portion 8.2 is a structure in other centrosymmetric forms.

[0037] Furthermore, as Figures 2-3As shown, a first drainage rib plate 11 is further provided in the second air inlet passage 7, and the first drainage rib plate 11 is located at the bend of the first air inlet passage 6 and / or the second air inlet passage 7. Preferably, there are two or more first drainage rib plates 11 arranged in parallel. Here, being arranged in parallel means that the distance between the two is approximately 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 does not concentrate on the outer side of the corner to form eddy currents, but flows evenly downstream, ensuring uniform gas distribution in the flow passage. Those skilled in the art can understand that a similar first drainage rib plate 11 can also be provided in the first air inlet passage 6.

[0038] Further, as Figures 2-3 shown, a second drainage rib plate 12 is further provided in the first air inlet passage 6 and the second air inlet passage 7, and the second drainage rib plate 12 is adjacent to the bend of the first air inlet passage 6 and the second air inlet passage 7. The second drainage rib plate 12 can be located upstream and / or downstream of the bend it is adjacent to. Preferably, there are two or more second drainage rib plates 12 arranged in parallel. The setting of the second drainage rib plate 12 can make the air flow distribution more uniform and prevent eddy currents from appearing downstream of the bend.

[0039] Further, as Figure 3 shown, a soundproof chamber 13 is included, and the soundproof chamber 13 is communicated with the first air inlet passage 6 through a gap 13.1. According to the Helmholtz soundproof principle, the first air inlet passage 6 can be regarded as the main pipe, and the 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, a 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 soundproof chamber 13, causing the air in the soundproof cavity 18 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 soundproof chamber 13 extends from the top to the left 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 soundproof chamber 13.

[0040] The first air inlet passage 6, the second air inlet passage 7, and the soundproof chamber 13 can all be formed by structures such as a housing and / or sound-absorbing cotton, which will not be elaborated here.

[0041] 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 only 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. These all belong to the protection scope of the present invention.

Claims

1. A ventilator, comprising an air inlet (4), an air inlet channel, a flow detection device (5) and a fan compartment (3), 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 first air inlet channel (6) and the second air inlet channel (7) are located below the fan compartment (3); The merging guide component (8) is used to guide the airflow in the first air inlet channel (6) and the second air inlet channel (7) to merge together, and to guide the airflow toward the flow detection device (5) above; 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. A ventilator according to claim 1, characterized in that: The ventilator further comprises a bottom shell (2), wherein the first air inlet channel (6) and the second air inlet channel (7) are located between the bottom shell (2) and the fan compartment (3); an air duct guide block (14) is arranged between the bottom shell (2) and the fan compartment (3), and the first air inlet channel (6) and the second air inlet channel (7) are arranged around the air duct guide block (14).

3. A ventilator according to claim 1, characterized in that: The fan compartment (3) comprises a fan (3.1) and an air guide (3.2) located around the fan (3.1); the air guide (3.2) is provided with a plurality of through holes (3.2.1); the through holes (3.2.1) connect the fan air inlet and the downstream of the air inlet channel.

4. 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).

5. 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).

6. A ventilator according to claim 5, characterized in that: The diverter plate (9) has at least one arc-shaped guide surface.

7. A ventilator according to claim 1, characterized in that: The converging guide component (8) further comprises a straight guide portion (8.2) extending in the vertical direction, wherein the straight guide portion (8.2) is located between the arc-shaped guide plate ( 8.1), the straight 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 vertically upward.

8. A ventilator according to claim 7, 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).

9. A ventilator according to claim 7, 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.

10. A ventilator according to claim 7, 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).

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