Chamber communicating channel structure and ventilation treatment equipment

Abstract

The invention discloses a cavity communication channel structure which is used for communicating two adjacent cavities and comprises a hollow framework (3) and a flexible silencing pot (4), the hollow framework (3) is tubular, and the flexible silencing pot (4) wraps the hollow framework (3). The invention further discloses ventilation treatment equipment. The cavity communicating channel structure can form an impedance combined type silencer structure, and a good noise reduction and elimination effect can be achieved under the condition that it is guaranteed that the resistance of an air channel is small.

Description

Technical Field

[0001] The invention relates to a chamber communication channel structure and ventilation treatment equipment, belonging to the technical field of ventilation treatment equipment. Background Art

[0002] Ventilation therapy equipment, also known as ventilators, is mainly used to assist in the treatment of sleep apnea syndrome. Precisely because it is a device that assists sleep, the level of noise control is one of the most important performance indicators of the ventilator, and it has always been a design difficulty in the field of ventilator technology. Summary of the invention

[0003] In order to reduce the noise of ventilation therapy equipment, the present invention provides a chamber connecting channel structure and ventilation therapy equipment, and the specific technical scheme is as follows.

[0004] The chamber connecting channel structure is used to connect two adjacent chambers, and is characterized by comprising:

[0005] A hollow frame and a flexible silencer, wherein the hollow frame is tubular and the flexible silencer is wrapped around the outside of the hollow frame.

[0006] By adopting the above technical solution, the chamber communication channel formed by the combination of the hollow frame and the flexible silencer can first guide most of the airflow to flow between the two ends of the chamber communication channel, while allowing a small part of the airflow to penetrate the hollow frame and the flexible silencer. When the noise generated by the fan as the noise source is transmitted back along the above two airflow paths, the noise sound waves on the two paths have a certain phase difference, interfere with and offset each other, thereby achieving a noise reduction and silencing effect.

[0007] Furthermore, a reinforcing rib is provided at the center of the hollow frame, and the reinforcing rib extends along the extension direction of the hollow frame. Preferably, the cross section of the reinforcing rib is cross-shaped. The reinforcing rib is provided to help improve the structural strength of the entire chamber connecting channel structure and prevent deformation during use.

[0008] Furthermore, the flexible silencer is made of sponge or fabric, which are good sound-absorbing materials and can effectively reduce noise.

[0009] Based on the same inventive concept, the present invention also relates to a ventilation therapy device, which includes a first air inlet chamber, a second air inlet chamber and the above-mentioned chamber communication channel structure;

[0010] The chamber communication channel structure is used to communicate the first air inlet chamber and the second air inlet chamber, and at least a portion of the chamber communication channel structure is located in the second air inlet chamber.

[0011] Furthermore, one end of the chamber connecting channel structure is located at the junction of the first air inlet chamber and the second air inlet chamber, or extends to the interior of the first air inlet chamber; the second air inlet chamber also has an air outlet, which is arranged close to the end of the chamber connecting channel structure.

[0012] Furthermore, at the end position of the chamber connecting channel structure close to the first air inlet chamber, the diameter of the first air inlet chamber is larger than the diameter of the chamber connecting channel structure; at the end position of the chamber connecting channel structure close to the second air inlet chamber, the diameter of the second air inlet chamber is larger than the diameter of the chamber connecting channel structure. With this arrangement, as the diameter of the airway increases and decreases before and after the first air inlet chamber and the second air inlet chamber, the sound waves also suddenly expand and contract in the airway cross section, causing a sudden change in the acoustic impedance in the airway, thereby changing the propagation direction of the sound waves. The diameter refers to the cross-sectional area or diameter through which the airflow flows at the cross section.

[0013] The chamber communication channel structure of the present invention can be formed into an impedance composite silencer structure, which can achieve better noise reduction and silencing effects while ensuring that the airway resistance is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is an exploded schematic diagram of the ventilation therapy device of the present invention;

[0015] Figure 2 is a schematic diagram of the ventilation therapy device of the present invention (with the upper cover removed);

[0016] Figure 3 yes Figure 2 A top view of the view;

[0017] Figure 4 It is a schematic diagram of airflow direction;

[0018] Figure 5 This is a schematic diagram of the noise generated by the fan being transmitted back along the airflow;

[0019] Figure 6 is a simplified model schematic diagram of an air intake silencer airway of a ventilation therapy device of the present invention;

[0020] Figure 7 It is a schematic diagram of a hollow skeleton.

[0021] In the figure: 1-upper cover, 2-PCB board assembly, 3-hollow frame, 3.1-frame buckle, 3.2-reinforcement ribs, 4-flexible muffler, 5-lower cover, 5.1-air inlet, 5.2-first air inlet chamber, 5.3-second air inlet chamber, 5.4-fan compartment air inlet duct, 5.5-air outlet, 6-fan compartment, A-chamber connecting channel structure. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0023] See also Figure 1-Figure 7 The ventilation therapy device includes an upper cover 1, a PCB board assembly 2, a chamber connecting channel structure A and a lower cover 5. The upper cover 1, the PCB board assembly 2 and the lower cover 5 are combined together to form a plurality of relatively sealed chambers inside, and these chambers include a first air inlet chamber 5.2, a second air inlet chamber 5.3 and a fan compartment 6.

[0024] The lower cover 5 is provided with an air inlet 5.1, and the first air inlet chamber 5.2 is in the shape of a long strip and is connected to the air inlet 5.1; the second air inlet chamber 5.3 is located downstream of the first air inlet chamber 5.2, and the second air inlet chamber 5.3 and the first air inlet chamber 5.2 are connected through a chamber connecting channel structure A. The chamber connecting channel structure A includes a hollow frame 3 and a flexible muffler 4, the hollow frame 3 is tubular, and the flexible muffler 4 is wrapped outside the hollow frame 3. The chamber connecting channel structure A allows most of the airflow to flow into the second air inlet chamber 5.3 along the extension direction of the hollow frame 3, and a small part of the airflow penetrates the hollow frame 3 and the flexible muffler 4 and enters the second air inlet chamber 5.3.

[0025] Preferably, if Figure 2-Figure 3 As shown, the entire chamber connecting channel structure A is located in the second air inlet chamber 5.3. The hollow skeleton 3 has a skeleton buckle 3.1, and the hollow skeleton 3 can be snapped onto the junction of the first air inlet chamber 5.2 and the second air inlet chamber 5.3 during installation. The air outlet 5.5 of the second air inlet chamber 5.3 is arranged close to the junction of the first air inlet chamber 5.2 and the second air inlet chamber 5.3, or extends to the inside of the first air inlet chamber 5.2. This forms a fan compartment air inlet duct 5.4 next to the chamber connecting channel structure A. The flow direction of the airflow is as shown in FIG. Figure 4 As shown, the air in the environment enters the first air inlet chamber 5.2 through the air inlet 5.1, and then most of the airflow enters the second air inlet chamber 5.3 along the extension direction of the chamber connecting channel structure A, and a small part of the airflow penetrates the hollow skeleton 3 and the flexible silencer 4 in the chamber connecting channel structure A. The two parts of the airflow converge in the fan compartment air inlet duct 5.4, and then enter the fan compartment 6 together through the air outlet 5.5.

[0026] Preferably, if Figure 4-Figure 6As shown, at the end position of the chamber communication channel structure A close to the first air inlet chamber 5.2, the diameter of the first air inlet chamber 5.2 is larger than the diameter of the chamber communication channel structure A; at the end position of the chamber communication channel structure A close to the second air inlet chamber 5.3, the diameter of the second air inlet chamber 5.3 is larger than the diameter of the chamber communication channel structure A. With this arrangement, as the diameter of the airway increases and decreases before and after the first air inlet chamber 5.2 and the second air inlet chamber 5.3, the sound wave also suddenly expands and contracts in the airway cross section, causing a sudden change in the acoustic impedance in the airway, thereby changing the propagation direction of the sound wave.

[0027] Preferably, a reinforcing rib 3.2 is provided at the center of the hollow skeleton 3, and the reinforcing rib 3.2 extends along the extension direction of the hollow skeleton 3. Preferably, the cross section of the reinforcing rib 3.2 is cross-shaped. By providing the reinforcing rib 3.2, it is helpful to improve the structural strength of the entire chamber connecting channel structure A and prevent deformation during use. The flexible muffler 4 is preferably made of sponge or fabric. In another embodiment, the hollow skeleton 3 can be in the form of a coil spring.

[0028] The gas flow direction of the ventilation therapy device of the present invention is as follows: air enters from the air inlet 5.1, passes through the first air inlet silencer cavity 5.2 and enters the chamber communication channel structure A. In the chamber communication channel structure A, most of the air flows through the internal channel of the chamber communication channel structure A, enters the second air inlet silencer cavity 5.3, and then enters the air outlet 5.5 (that is, the air inlet of the fan chamber) through the fan chamber air inlet duct 5.4; while a small amount of air penetrates the hollow frame 3 and the flexible silencer 4, directly enters the fan chamber air inlet duct 5.4, and after merging with most of the air, enters the fan chamber 6 through the air outlet 5.5.

[0029] In the ventilation treatment device, the noise source is a turbine fan (not shown) located in the fan compartment 6, so the propagation direction of the sound wave in the air inlet duct is just opposite to the flow direction of the gas. Figure 5 The sound waves enter the second air inlet silencing chamber 5.3 from the air outlet 5.5, pass through the fan compartment air inlet duct 5.4 and the chamber connecting channel structure A in turn, enter the first air inlet silencing chamber 5.2, and finally pass into the environment through the air inlet 5.1.

[0030] The noise reduction principle of the ventilation therapy device of the present invention is as follows.

[0031] The design of the integral air intake silencer airway in the ventilation therapy device of the present invention has a triple silencer effect:

[0032] 1. The hollow skeleton 3 and the flexible silencer 4 form a straight tube type resistive silencer. Since the hollow skeleton 3 is a hollow structure, when the sound wave passes through the airway wrapped by the flexible silencer 4, the sound wave can pass through the hollow of the hollow skeleton 3 and directly enter the flexible silencer 4. Since the flexible silencer 4 is a sound absorbing material, the sound wave will excite the air molecules in the small holes of the flexible silencer 4 to vibrate. This vibration consumes part of the sound energy to overcome friction and viscosity, and converts it into heat energy, thereby achieving the effect of noise elimination.

[0033] 2. After the sound waves enter the fan compartment air inlet duct 5.4 from the air outlet 5.5, part of the sound waves directly enter the second air inlet muffler cavity 5.3. However, since the flexible muffler 4 is a porous structure, another part of the sound waves will pass through the muffler sponge 4 and directly penetrate into the inlet hollow skeleton 3. This part of the sound waves and the sound waves passing through the second air inlet muffler cavity 5.3 meet in the hollow skeleton 3. By controlling the equivalent diameter and length of the second air inlet muffler cavity 5.3, as well as the thickness and density of the flexible muffler 4, the two sound waves have a certain phase difference, interfere with and offset each other, thereby achieving a certain noise reduction and silencing effect.

[0034] 3. If Figure 6 As shown, the design model of the air intake silencer airway of the ventilation therapy equipment is shown. From the air inlet 1 to the air outlet 5.5, it can be regarded as two sections of expansion chamber resistance silencer structure connected in series. In the entire air intake silencer airway, the first air intake silencer cavity 5.2 and the second air intake silencer cavity 5.3 can be regarded as expansion chambers, and the air inlet 5.1, the chamber connecting channel structure A and the air outlet 5.5 can be regarded as connecting airways. As the airway expands and contracts in diameter before and after the expansion chamber, the sound waves also suddenly expand and contract in the cross section of the airway, causing a sudden change in the acoustic impedance in the airway, thereby changing the propagation direction of the sound waves. The sound waves are emitted to the inner wall surface in the airway and reflected by the wall surface. Sound waves in different directions meet and interfere in the airway, thereby achieving the effect of silencer. However, since an expansion chamber of a specific length has a certain pass-through frequency for sound waves, that is, the silencing effect on sound waves with a specific frequency is zero, two expansion chambers with different lengths (i.e., the first air intake silencing chamber 5.2 and the second air intake silencing chamber 5.3) are connected in series in this design so that their respective pass-through frequencies are staggered, thereby improving the silencing frequency characteristics of the entire airway and enhancing the silencing effect.

[0035] The embodiments of the present invention are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention is not limited to the above-mentioned specific implementations, which are merely illustrative and not restrictive. Under the enlightenment of the present invention, those skilled in the art can also make many forms without departing from the scope of protection of the present invention and the claims, all of which belong to the protection scope of the present invention.

Claims

1. The chamber connecting channel structure is used to connect two adjacent chambers. It is characterized in that include: A hollow frame (3) and a flexible silencer (4), wherein the hollow frame (3) is tubular and the flexible silencer (4) is wrapped around the outside of the hollow frame (3).

2. The chamber communication channel structure according to claim 1, It is characterized in that A reinforcing rib (3.2) is provided at the center of the hollow frame (3), and the reinforcing rib (3.2) extends along the extension direction of the hollow frame (3).

3. The chamber communication channel structure according to claim 2, It is characterized in that The cross section of the reinforcing rib (3.2) is cross-shaped.

4. The chamber communication channel structure according to claim 1, It is characterized in that The flexible silencer (4) is made of sponge or fabric.

5. The chamber communication channel structure according to claim 1, It is characterized in that The hollow skeleton (3) adopts a spiral spring.

6. A ventilation therapy device comprising a first air inlet chamber, a second air inlet chamber and a chamber communication channel structure (A) as claimed in any one of claims 1 to 4; The chamber connecting channel structure (A) is used to connect the first air inlet chamber (5.2) and the second air inlet chamber (5.3), and at least a portion of the chamber connecting channel structure (A) is located in the second air inlet chamber (5.3).

7. The ventilation therapy device according to claim 6, It is characterized in that One end of the chamber connecting channel structure (A) is located at the junction of the first air inlet chamber (5.2) and the second air inlet chamber (5.3), or extends to the interior of the first air inlet chamber; the second air inlet chamber (5.3) also has an air outlet (5.5), and the air outlet (5.5) is arranged close to the end of the chamber connecting channel structure (A).

8. The ventilation therapy device according to claim 6, It is characterized in that At an end position of the chamber connecting channel structure (A) close to the first air inlet chamber (5.2), the diameter of the first air inlet chamber (5.2) is larger than the diameter of the chamber connecting channel structure (A); at an end position of the chamber connecting channel structure (A) close to the second air inlet chamber (5.3), the diameter of the second air inlet chamber (5.3) is larger than the diameter of the chamber connecting channel structure (A).

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