Noise reduction fan for breathing machine and breathing machine using noise reduction fan

Abstract

The noise reduction fan comprises a shell, a motor, an impeller and an air outlet pipe, a first cavity capable of containing the motor, a second cavity capable of containing the impeller and a third cavity communicated with the second cavity and the air outlet pipe are arranged in the shell, and the air outlet pipe is communicated with the second cavity. The shell is of a shell-shaped structure, wherein the top of the second cavity is sealed, and the bottom of the first cavity is open downwards. A gap between the inner wall of the first cavity of the shell and the motor forms an air inlet flow channel for air to enter from the bottom of the shell, and the air inlet flow channel is communicated with the second cavity, so that an air flowing path which enters from the bottom of the shell and sequentially enters from the air inlet flow channel, the second cavity and the third cavity to the air outlet pipe is formed. The top inlet of a traditional fan is closed, so that sound cannot be transmitted out, noise generated when the breathing machine operates is reduced, top suction is changed into bottom suction, the air inlet is formed in the bottom of the shell, the noise can be prevented from being directly radiated out, and the purpose of reducing the using noise of the breathing machine is achieved.

Description

Technical Field

[0001] This utility model relates to the field of ventilator technology, specifically to a noise-reducing fan for a ventilator and a ventilator using the same. Background Technology

[0002] In modern clinical medicine, ventilators, as an effective means of artificially replacing spontaneous ventilation, are widely used for respiratory failure caused by various reasons, anesthetic respiratory management during major surgery, respiratory support therapy, and emergency resuscitation, and occupy a very important position in the field of modern medicine.

[0003] Currently, the designs of the fans used in ventilators on the market are largely similar, with the vast majority being ordinary centrifugal fans. The air inlet of most ventilator fans is a standard top-mounted type. Air enters through the top of the fan, reaches the center of the impeller, and is then circumferentially thrown out by centrifugal force. It then flows through the volute casing and exits at the outlet. The motor is located at the bottom of the volute casing, with its shaft extending out to mount and drive the impeller. This is the traditional air intake method for fans. (See...) Figure 1 As shown.

[0004] Because ventilators accelerate airflow by driving an impeller with a high-speed motor, they create noticeable pressure pulsations in the fan channel. These pressure pulsations are then transmitted to the user's ears as sound. The strong airflow noise can cause significant discomfort to the user. Moreover, the noise of traditional centrifugal fans is mainly transmitted through the top-suction volute inlet, directly reaching the patient's ears, which is especially unbearable for patients when using them, especially in the quiet of the night.

[0005] In view of this, how to solve the problem of excessive noise from the existing ventilator fan that is unbearable for users has become the subject of this invention. Summary of the Invention

[0006] The purpose of this invention is to provide a noise-reducing fan for a ventilator and a ventilator using the same, so as to reduce the noise of the ventilator fan from the perspective of noise source.

[0007] To achieve the above objectives, the first aspect of this utility model proposes a noise-reducing fan for a ventilator. The noise-reducing fan includes a housing, a motor, an impeller, and an air outlet pipe. The housing has a first chamber for accommodating the motor, a second chamber for accommodating the impeller, and a third chamber connecting the second chamber and the air outlet pipe. Its innovation lies in:

[0008] The housing is a shell-like structure with the top of the second chamber sealed and the bottom of the first chamber open downwards; the gap between the inner wall of the first chamber of the housing and the motor forms an air intake channel for air to enter from the bottom of the housing, and the air intake channel is connected to the second chamber, thereby forming an airflow path that enters through the bottom of the housing and sequentially flows from the air intake channel, the second chamber, the third chamber to the air outlet pipe.

[0009] The relevant contents of this utility model are explained as follows:

[0010] 1. In the above-mentioned technical solution of this utility model, in view of the problem of high noise during use of existing top-inhalation ventilator fans, a noise-reducing fan for ventilators with top sealing and bottom inhalation, and a ventilator using it are innovatively designed. Air enters through the bottom of the shell and sequentially flows from the air inlet channel, the second chamber, the third chamber to the air outlet pipe. The top inlet of the traditional fan is sealed to prevent sound from escaping. The top inhalation is changed to bottom inhalation. The air inlet is set at the bottom of the shell, which can prevent noise from being directly radiated out. The air inlet channel is set in the gap between the inner wall of the first chamber of the shell and the motor. The airflow can enter by wrapping around the surface of the motor and carrying the heat of the motor, which is conducive to the full heat dissipation of the motor. At the same time, this setting of the air inlet channel also helps to reduce noise.

[0011] 2. In the above technical solution, a plurality of vertically spaced ribs are provided on the periphery of the inner wall of the first cavity. These ribs serve to rectify the airflow, form a noise-absorbing duct, support the motor, and reduce vibration.

[0012] 3. In the above technical solution, at least some of the ribs are close to the outer wall of the motor to form multiple air intake channels between the inner wall of the first cavity of the housing and the motor, thereby forming a more effective noise reduction channel and further reducing the fan noise.

[0013] 4. In the above technical solution, the ribs are integrally formed with the shell. This reduces the number of parts, making assembly simpler and saving time.

[0014] 5. In the above technical solution, the rib is a strip structure made of soft rubber material, which abuts against and supports the motor, thereby improving the shock absorption effect and reducing motor vibration noise.

[0015] 6. In the above technical solution, the housing has an air inlet that gradually expands outward at the lower part of the inner wall of the first chamber to facilitate air intake.

[0016] 7. In the above technical solution, the air inlet has an arc-shaped curved surface extending upward to the ribs, making the air intake more uniform and stable.

[0017] 8. In the above technical solution, the housing is provided with a downwardly expanding connection port at the connection between the first chamber and the second chamber, so that the airflow drawn from the first chamber can enter the second chamber better after the impeller generates negative pressure.

[0018] 9. In the above technical solution, the connecting port has an arc-shaped curved surface or inclined surface extending downward to the rib, so as to make the airflow from the first chamber into the second chamber more uniform and stable, and reduce wind noise.

[0019] 10. In this utility model, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0020] 11. In this utility model, the terms “center”, “upper”, “lower”, “axial”, “bottom”, “inner”, “outer”, etc., indicate the orientation or positional relationship based on the orientation or positional assembly relationship shown in the drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] 12. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] Due to the application of the above solution, this utility model has the following advantages and effects compared with the prior art:

[0023] 1. The above-mentioned solution of this utility model, compared with the traditional centrifugal fan whose noise is mainly transmitted through the top suction volute inlet, seals the top inlet of the traditional fan to prevent sound from being transmitted, thereby reducing the noise of the ventilator during operation.

[0024] 2. The above-mentioned solution of this utility model reverses the impeller, changes the top suction to bottom suction, and sets the air intake at the bottom of the housing, which can prevent noise from being directly radiated out.

[0025] 3. In the above-mentioned solution of this utility model, the air intake channel is set in the gap between the inner wall of the first cavity of the housing and the motor. The airflow can enter the motor surface and carry the motor heat, which is conducive to the full heat dissipation of the motor. At the same time, this setting of the air intake channel is also conducive to reducing noise. Attached Figure Description

[0026] Figure 1 This is a cross-sectional schematic diagram of an existing ventilator fan;

[0027] Figure 2 This is a cross-sectional schematic diagram of a noise-reducing fan for a ventilator according to an embodiment of the present invention;

[0028] Figure 3 This is a three-dimensional cross-sectional schematic diagram of a noise-reducing fan for a ventilator according to an embodiment of the present invention;

[0029] Figure 4 This is a bottom view of a noise-reducing fan for a ventilator according to an embodiment of the present invention;

[0030] Figure 5 This is a schematic diagram of the airflow path in an embodiment of this utility model.

[0031] The parts shown in the above attached diagram are illustrated below:

[0032] 1. Shell

[0033] 101 First Chamber

[0034] 102 Second Chamber

[0035] 103 Third Chamber

[0036] 110 Intake Channel

[0037] 11. Ribs

[0038] 12 air intakes

[0039] 13 Unicom ports

[0040] 2 motors

[0041] 3 Impeller

[0042] 4. Air outlet pipe. Detailed Implementation

[0043] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0044] This invention addresses the problem of excessive noise in existing top-mounted ventilator fans by innovating a noise-reducing fan for ventilators with a closed top and bottom-mounted intake, as well as a ventilator using the same fan. This reduces the noise from the source of the noise and improves user comfort.

[0045] Example 1, as Figures 2 to 4 As shown, Embodiment 1 of this utility model discloses a noise-reducing fan for a ventilator. The noise-reducing fan includes a housing 1, a motor 2, an impeller 3, and an air outlet pipe 4. The housing 1 has a first chamber 101 that can accommodate the motor 2, a second chamber 102 that can accommodate the impeller 3, and a third chamber 103 that connects the second chamber 102 and the air outlet pipe 4. The housing 1 is a shell-like structure with the top of the second chamber 102 sealed and the bottom of the first chamber 101 open downwards. The gap between the inner wall of the first chamber 101 of the housing 1 and the motor 2 forms an air intake channel 110 that allows air to enter from the bottom of the housing 1. The air intake channel 110 connects to the second chamber 102, thereby forming an airflow path that enters from the bottom of the housing 1 and sequentially flows from the air intake channel 110, the second chamber 102, the third chamber 103, to the air outlet pipe 4.

[0046] The working principle and airflow path of Embodiment 1 of this utility model can be found by referring to... Figure 5 The arrows in the diagram indicate the direction of airflow. Motor 2 drives impeller 3 to rotate, and a negative pressure is formed at the center of impeller 3. Due to the pressure difference, the external airflow passes through the bottom of housing 1 and enters the second chamber 102 through the gap between motor 2 and housing 1 (air inlet channel 110). After being pressurized by impeller 3, it flows out through the third chamber 103 and outlet pipe 4.

[0047] Through the implementation of Embodiment 1 of this utility model, air enters through the bottom of the housing 1 and sequentially flows from the air inlet channel, the second chamber 102, the third chamber 103 to the air outlet pipe 4. The top inlet of the traditional fan is sealed to prevent sound from escaping. The top suction is changed to bottom suction, and the air inlet is set at the bottom of the housing 1, which can prevent noise from being directly radiated out. The air inlet channel 110 is set in the gap between the inner wall of the first chamber 101 of the housing 1 and the motor 2. The airflow can wrap around the surface of the motor 2 and enter, carrying the heat of the motor 2, which is conducive to the full heat dissipation of the motor 2. At the same time, this setting of the air inlet channel 110 is also conducive to reducing noise.

[0048] In the above embodiment of the present invention, a plurality of ribs 11 arranged at intervals in the vertical direction are provided on the periphery of the inner wall of the first chamber 101. The ribs 11 serve to form a sound-absorbing air duct, support the motor 2, and reduce vibration.

[0049] In the first embodiment of this utility model, at least some of the ribs 11 are close to the outer wall of the motor 2 to form multiple air intake channels 110 between the inner wall of the first chamber 101 of the housing 1 and the motor 2, thereby forming a more effective noise reduction air duct and further reducing fan noise. If all the ribs 11 are close to the outer wall of the motor 2, then refer to Figure 3 , Figure 4 As shown, nine ribs 11 are provided on the inner wall of the first chamber 101 of the housing 1, and nine air intake channels 110 are formed between each rib 11.

[0050] In the first embodiment of this utility model, the rib 11 is integrally formed with the housing 1. This reduces the number of parts, making assembly simpler and saving time. Alternatively, the rib 11 can be separate from the housing 1. When separate, the rib 11 is a strip-shaped structure made of soft rubber material, and it abuts against and supports the motor 2, thereby improving shock absorption and reducing vibration noise from the motor 2.

[0051] In the first embodiment of this utility model, the housing 1 has a downwardly expanding air inlet 12 on the lower part of the inner wall of the first chamber 101 to facilitate air intake. Specifically, the air inlet 12 has an arc-shaped curved surface extending upward to the rib 11, making the air intake more uniform and stable.

[0052] In the first embodiment of this utility model, a downwardly expanding connecting opening 13 is provided on the housing 1 at the connection between the first chamber 101 and the second chamber 102, so that the airflow drawn from the first chamber 101 can enter the second chamber 102 better after the impeller 3 generates negative pressure. Specifically, the connecting opening 13 has an arc-shaped curved surface or inclined surface extending downward to the rib 11, so as to make the airflow from the first chamber 101 into the second chamber 102 more uniform and stable, and reduce wind noise.

[0053] Example 2: This utility model discloses a ventilator that uses the noise-reducing fan described in this utility model embodiment.

[0054] Example 3: This utility model discloses a ventilator, which includes a noise-reducing fan. The noise-reducing fan includes a housing 1, a motor 2, an impeller 3, and an air outlet pipe 4. The housing 1 has a first chamber 101 that can accommodate the motor 2, a second chamber 102 that can accommodate the impeller 3, and a third chamber 103 that connects the second chamber 102 and the air outlet pipe 4. To match the air intake, the impeller 3 is reversed compared to a conventional fan, and the air inlet 12 of the impeller 3 is moved to the bottom of the housing 1 to achieve bottom air intake. The housing 1 is a shell-like structure with a sealed top in the second chamber 102 and an open bottom in the first chamber 101. Multiple vertically spaced ribs 11 are arranged on the periphery of the inner wall of the first chamber 101, and these ribs 11 are close to the outer wall of the motor 2 to form multiple air intake channels 110 between the inner wall of the first chamber 101 of the housing 1 and the motor 2. The housing 1 has a downwardly expanding air inlet at the lower part of the inner wall of the first chamber 101. 12. The air inlet 12 has an arc-shaped curved surface extending upward to the rib 11. The air inlet channel 110 is connected to the second chamber 102. The housing 1 is provided with a downwardly expanding connecting port 13 at the connection between the first chamber 101 and the second chamber 102. The connecting port 13 has an arc-shaped curved surface or inclined surface extending downward to the rib 11. The air flow path enters through the bottom of the housing 1 and sequentially flows from the air inlet channel 110, the second chamber 102, the third chamber 103 to the air outlet pipe 4.

[0055] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A noise-reducing fan for a ventilator, the noise-reducing fan comprising a housing (1), a motor (2), an impeller (3), and an air outlet pipe (4), wherein the housing (1) has a first chamber (101) capable of accommodating the motor (2), a second chamber (102) capable of accommodating the impeller (3), and a third chamber (103) connecting the second chamber (102) and the air outlet pipe (4), characterized in that: The housing (1) is a shell-like structure with the top of the second chamber (102) sealed and the bottom of the first chamber (101) open downwards; the gap between the inner wall of the first chamber (101) of the housing (1) and the motor (2) forms an air intake channel (110) for air to enter from the bottom of the housing (1), and the air intake channel (110) is connected to the second chamber (102), thereby forming an air flow path that enters from the bottom of the housing (1) and sequentially flows from the air intake channel (110), the second chamber (102), the third chamber (103) to the air outlet pipe (4).

2. The noise-reducing fan for a ventilator according to claim 1, characterized in that: The inner wall of the first chamber (101) is provided with a plurality of ribs (11) arranged at intervals in the vertical direction.

3. The noise-reducing fan for a ventilator according to claim 2, characterized in that: At least a portion of the ribs (11) are close to the outer wall of the motor (2) to form a plurality of air intake channels (110) between the inner wall of the first chamber (101) of the housing (1) and the motor (2).

4. The noise-reducing fan for a ventilator according to claim 2, characterized in that: The rib (11) is integrally formed with the shell (1).

5. The noise-reducing fan for a ventilator according to claim 2, characterized in that: The rib (11) is a strip structure made of soft rubber material.

6. The noise-reducing fan for a ventilator according to claim 2, characterized in that: The housing (1) has an air inlet (12) that gradually expands outwards downward on the lower part of the inner wall of the first chamber (101).

7. The noise-reducing fan for a ventilator according to claim 6, characterized in that: The air inlet (12) has an arc-shaped surface that extends upward to the rib (11).

8. The noise-reducing fan for a ventilator according to claim 2, characterized in that: The housing (1) has a downwardly expanding connection port (13) at the connection between the first chamber (101) and the second chamber (102).

9. The noise-reducing fan for a ventilator according to claim 8, characterized in that: The connecting port (13) has an arc-shaped curved surface or inclined surface extending downward to the rib (11).

10. A ventilator, characterized in that: The ventilator uses a noise-reducing fan as described in any one of claims 1 to 9.

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