A sealed water tank for a breathing machine and a breathing machine

Abstract

The present application relates to the technical field of breathing machine, and particularly relates to a sealed water tank for breathing machine and the breathing machine, which comprises a water tank upper shell (1), a water tank bottom shell (2) and a sealing ring (3); the water tank upper shell (1) comprises a water tank upper shell body (4) and an upper shell flange (6); the sealing ring (3) is used for filling the gap between the bottom surface of the water tank upper shell body (4) and the top surface of the water tank bottom shell (2) and the gap between the upper shell flange (6) and the sidewall of the water tank bottom shell (2); there is a gain angle between the bottom surface of the sealing ring (3) and the horizontal plane.

Description

Technical Field

[0001] This invention relates to the field of ventilator technology, and in particular to a sealed water tank for use in a ventilator and a ventilator. Background Technology

[0002] During operation, the water tank of a ventilator contains a certain amount of water and air, and is under a certain working pressure, thus requiring a reliable sealing structure. Furthermore, the water tank needs to be changed and cleaned, necessitating frequent disassembly and reassembly.

[0003] Generally, sealing methods (including but not limited to O-rings) are classified into axial seals and radial seals based on the placement of the sealing ring, the direction of its deformation, and the direction in which fluid flow is prevented. Radial seals (face seals) generally prevent radial fluid flow, while axial seals prevent axial fluid flow.

[0004] For end-face sealing, the upper shell of the water tank consists of an upper shell body and a flange extending axially below the upper shell body. The top of the side wall of the bottom shell is stepped, with a sealing ring placed at the notch of the step. The flange extends into the sealing ring and connects with the side wall of the bottom shell. By pressing the upper shell body downwards in the axial direction, the interference compression of the sealing ring seals the gap between the upper and bottom shells of the water tank. However, when the diameter of the sealing surface is large (e.g., Φ140), the compression deformation of the sealing ring is large. Even if the sealing ring is very soft (e.g., 25 degrees), a large axial pressure is required to ensure sufficient compression (interference) of the sealing ring to guarantee a sealing effect. When the sealing ring is compressed, there will be a rebound force. The greater the compression, the greater the rebound force. When the upper and lower shells are tightened into place, the compression must be greater than a certain value, which must be greater than the flatness tolerance and dimensional tolerance of the mating surfaces. Furthermore, the frictional force generated after the sealing ring is compressed must be greater than the internal pressure of the water tank to ensure a seal. During the compression of the sealing ring, the greater the compression, the greater the material density and the greater the elastic modulus; in other words, "the more it's compressed, the harder it becomes," and the greater the rebound force. Therefore, tools or external mechanisms are generally used to install and remove the water tank's upper shell. Manual operation would be quite difficult.

[0005] For radial seals, such as Figure 1As shown, the water tank's upper shell consists of an upper shell body and a flange extending radially below the upper shell body. A sealing ring is placed within the gap (inner and outer sleeve dimensional gap) between the flange and the side wall of the water tank's bottom shell. The upper shell body is in contact with the top of the side wall of the water tank's bottom shell. The gap between the flange and the side wall of the water tank's bottom shell is sealed by the sealing ring. To achieve a sealing effect, it is necessary to ensure that the sealing ring can fill this gap after interference compression, and that the frictional force between the sealing ring and the inner and outer sleeves is greater than the pressure inside the water tank. The compression of the sealing ring must also be greater than a certain value, which must be greater than the cylindricity tolerance and dimensional tolerance of the mounting surfaces. For sealing rings with a relatively large diameter d (e.g., d = 140 mm), even if the sealing ring is very soft, if axial pushing or rotational movement is required after the sealing ring enters the gap, the frictional force will be relatively large, making manual operation difficult.

[0006] Generally, sealing rings are made of solid silicone or nitrile rubber. When the material hardness is below 30 degrees, significant flash occurs during molding, severely affecting the installation accuracy and molding success rate of the sealing ring. Therefore, the hardness of solid silicone or nitrile rubber cannot be designed to be too low. Furthermore, the water tank of a ventilator experiences pressures of up to 20 hPa during operation, requiring a further increase in the compression of the sealing ring to ensure sufficient friction. Increased sealing ring hardness or compression further compresses the water tank manually, making manual disassembly and assembly more difficult.

[0007] In summary, the water tank of a ventilator must ensure the reliability of the seal while also reducing the tightening force required by hand operation. Existing radial and axial sealing structures are difficult to implement. Summary of the Invention

[0008] The purpose of this invention is to overcome the above-mentioned shortcomings of the prior art, thereby providing a sealed water tank for a ventilator and a ventilator.

[0009] To solve the above-mentioned technical problems, the technical solution of the present invention provides a sealed water tank for a ventilator, comprising: an upper shell 1, a bottom shell 2, and a sealing ring 3, wherein,

[0010] The upper shell 1 of the water tank includes: an upper shell body 4 and an upper shell flange 6 extending downward along the axial direction below the upper shell body 4; wherein,

[0011] The sealing ring 3 is used to fill the gap between the bottom surface of the upper shell body 4 and the top surface of the bottom shell 2 of the water tank and the gap between the upper shell flange 6 and the side wall of the bottom shell 2 of the water tank.

[0012] There is a gain angle between the bottom surface of the sealing ring 3 and the horizontal plane.

[0013] Preferably, the upper shell flange 6 is provided with a plurality of spiral protrusions 8 that are evenly distributed circumferentially and spiral upward in the axial direction and extend radially outward; the inner wall of the water tank bottom shell 2 is provided with spiral grooves that match the plurality of spiral protrusions 8; the sealing ring 3 is provided with a plurality of through holes 10; the plurality of spiral protrusions 8 extend through the through holes 10 to the spiral grooves of the water tank bottom shell 2.

[0014] Preferably, the upper shell flange 6 is provided with a plurality of external blocking protrusions 7 that are circumferentially evenly distributed and extend radially outward near its bottom end, and the sealing ring 3 is provided with a plurality of internal anti-detachment grooves 9, and the plurality of external blocking protrusions 7 are respectively installed into the internal anti-detachment grooves 9.

[0015] Preferably, the sealing ring 3 is composed of a first sealing ring 31, a second sealing ring 32, and a third sealing ring 33; wherein,

[0016] The first sealing ring 31 is used to fill the gap between the bottom surface of the upper shell body 4 of the water tank and the top surface of the bottom shell 2 of the water tank;

[0017] The second sealing ring 32 is used to fill the gap between the upper shell flange 6 and the side wall of the bottom shell 2 of the water tank, and is provided with several internal anti-detachment grooves 9 and several through holes 10;

[0018] The third sealing ring 33 and the second sealing ring 32 are combined to cover the bottom end of the upper shell flange 6. The angle between the bottom surface of the third sealing ring 33 and the horizontal plane is used as the gain angle, and the gain angle is an acute angle.

[0019] Preferably, the top of the side wall of the bottom shell 2 of the water tank is stepped, and the first sealing ring 31 fills the gap between the stepped notch and the bottom surface of the upper shell 1 of the water tank.

[0020] Preferably, the third sealing ring 33 includes a top 331 and a bottom 332, wherein,

[0021] The top 331 of the third sealing ring has an L-shaped cross section; the first surface 3311 of the top of the third sealing ring is located below a number of spiral protrusions 8 and external blocking protrusions 7, and its outer side is joined to the lower end of the second sealing ring 32; the second surface 3312 of the top of the third sealing ring is located inside the number of spiral protrusions 8 and external blocking protrusions 7.

[0022] The bottom 332 of the third sealing ring has a triangular cross-section; the bottom first surface 3321 of the third sealing ring is joined to the top first surface 3311 of the third sealing ring; the bottom second surface 3322 of the third sealing ring is parallel to the side wall of the bottom shell 2 of the water tank; the bottom third surface 3323 of the third sealing ring extends from the lower end of the bottom second surface 3322 of the third sealing ring to the inner end of the bottom first surface 3321 of the third sealing ring; the bottom third surface 3323 of the third sealing ring serves as the bottom surface of the sealing ring 3.

[0023] Preferably, the spacing between any two adjacent external blocking protrusions 7 is the same; the spacing between any two spiral protrusions 8 is the same.

[0024] Preferably, a spiral protrusion 8 is provided every two of the external blocking protrusions 7.

[0025] Preferably, the sealing ring 3 and the component in contact with it have a zero-clearance fit or an interference fit.

[0026] As another object of the present invention, the present invention also provides a ventilator, including the above-described sealed water tank for a ventilator.

[0027] Compared with the prior art, the advantages of the present invention are that the sealed water tank and ventilator provided by the present invention can achieve both a reliable sealing effect and the convenience of manual operation. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a sealed water tank for a ventilator using existing technology.

[0029] Figure 2 A cross-sectional view of a sealed water tank for a ventilator provided by the present invention;

[0030] Figure 3 This is a cross-sectional view of the upper shell 1 of the water tank of the present invention;

[0031] Figure 4 This is a side view of the upper shell 1 of the water tank of the present invention;

[0032] Figure 5 This is a bottom view of the upper shell 1 of the water tank of the present invention;

[0033] Figure 6 This is a perspective view of the upper shell 1 of the water tank of the present invention;

[0034] Figure 7 This is a perspective view of the sealing ring 3 of the present invention;

[0035] Figure 8 This is a cross-sectional view of the sealing ring 3 of the present invention;

[0036] Figure 9This is a partial bottom view of the sealing ring 3 of the present invention;

[0037] Figure 10 This is a partial side view of the sealing ring 3 of the present invention;

[0038] Figure 11 This is a partial installation diagram of the sealing ring 3 and the upper shell 1 of the water tank;

[0039] Figure 12 This is a schematic diagram illustrating the sealing principle of the sealed water tank for a ventilator provided by the present invention.

[0040] Attached Figure Labels

[0041] 1. Upper shell of water tank 2. Bottom shell of water tank 3. Sealing ring

[0042] 4. Water tank upper shell body; 5. Water tank upper shell handle; 6. Upper shell flange.

[0043] 7. External blocking protrusions; 8. Spiral protrusions; 9. Internal anti-detachment grooves.

[0044] 10. Through hole; 11. Handle on bottom shell of water tank; 31. First sealing ring.

[0045] 32. Second sealing ring; 33. Third sealing ring; 331. Top of the third sealing ring

[0046] 332, bottom of the third sealing ring; 3311, top of the third sealing ring; 3312, first and second surfaces of the top of the third sealing ring.

[0047] 3321, Bottom of the third sealing ring; 3322, Bottom of the third sealing ring; 3323, First surface, second surface, and third surface of the bottom of the third sealing ring. Detailed Implementation

[0048] The technical solutions provided by the present invention will be further illustrated below with reference to the embodiments.

[0049] This embodiment provides a sealed water tank for a ventilator and a ventilator having the sealed water tank. The sealed water tank can achieve both a reliable sealing effect and the convenience of manual operation.

[0050] like Figure 2 As shown, a shaped sealing ring 3 is installed between the upper shell 1 and the bottom shell 2 of the water tank to achieve a seal between them. The shaped sealing ring can be made of silicone or other biocompatible polymer elastic materials such as PU. During installation, the seal is achieved through material compression and deformation. Figure 3 and 4As shown, the upper shell 1 of the water tank is provided with a water tank upper shell body 4. An axially upward extending handle 5 is provided above the water tank upper shell body 4, and an axially downward extending upper shell flange 6 is provided below the water tank upper shell body 4. Figure 4 and Figure 5 As shown, near its bottom end, the upper shell flange 6 has several external blocking protrusions 7 extending radially outward; these external blocking protrusions 7 are evenly distributed circumferentially, and can also be located near the bottom end of the upper shell flange 6. In this embodiment, a total of 8 external blocking protrusions 7 are provided, with the same spacing between any two adjacent external blocking protrusions 7. In this embodiment, the external blocking protrusions 7 on the upper shell 1 of the water tank are located at the lowest part of the upper shell 1, closest to the interference deformation position below the sealing ring 3. This maximizes structural support for the interference position below the sealing ring 3, preventing deformation during tightening.

[0051] like Figure 4 and Figure 6 As shown, near its bottom end, the upper shell flange 6 is provided with a plurality of radially extending spiral protrusions 8. These spiral protrusions 8 are evenly distributed circumferentially. A spiral groove is provided on the inner side of the bottom shell 2 near the top to secure the spiral protrusions 8. The spiral groove spirals upwards axially, guiding the spiral protrusions 8 to be secured to the target position. In this embodiment, one spiral protrusion 8 is provided every two external blocking protrusions 7, for a total of four spiral protrusions 8. The spacing between any two spiral protrusions 8 is the same. There are no special requirements regarding the positional relationship between the external blocking protrusions 7 and the spiral protrusions 8. The spiral protrusions 8 also facilitate the fixation of the sealing ring.

[0052] like Figure 2 As shown, the water tank bottom shell 2 has a water tank bottom shell side wall and a water tank bottom shell handle 11. (As...) Figure 7-12 As shown, sealing ring 3 is an irregularly shaped sealing ring. (As indicated...) Figure 7-8 As shown, the sealing ring 3 is divided into a first sealing ring 31, a second sealing ring 32 and a third sealing ring 33. The sealing ring is an integral structure, or it can be designed separately and then fixed together.

[0053] like Figure 2 and Figure 12 As shown, the sealing ring 3 is used to fill the gap between the bottom surface of the upper shell 1 and the top surface of the lower shell 2. Specifically, the top of the side wall of the lower shell 2 is stepped. Figure 7-8 The first sealing ring 31 shown extends to the gap between the notch of the step and the bottom surface of the upper shell 1 of the water tank.

[0054] like Figure 2 and Figure 12 As shown, the sealing ring 3 also fills the gap between the upper shell flange 6 of the upper shell 1 and the side wall of the bottom shell 2 of the water tank. Specifically, as... Figure 7-8 The second sealing ring 32 shown engages with the inner side of the first sealing ring 31. The second sealing ring 32 is used to fill the gap between the upper shell flange 6 of the upper shell 1 and the side wall of the bottom shell 2 of the water tank, such as... Figure 7 and Figure 9 As shown, the second sealing ring 32 is provided with an internal anti-detachment groove 9 that mates with the external blocking protrusion 7 of the upper shell 1 of the water tank, making the seal 3 less prone to deformation. During installation, each internal anti-detachment groove 9 is fitted onto the corresponding external blocking protrusion 7. When the upper shell 1 of the water tank is loosened, the irregular sealing ring 3 is subjected to downward frictional force, and the external blocking protrusion 7 on the upper shell 1 of the water tank locks into the internal anti-detachment groove 9 of the irregular sealing ring 3, which can prevent the irregular sealing ring 3 from coming off the upper shell 1 of the water tank.

[0055] like Figure 7 and Figure 9 As shown, the second sealing ring 32 is also provided with several through holes 10. One end of several spiral protrusions 8, located at the upper flange 6 of the water tank upper shell 1, extends outward from the through holes 10. This embodiment has four spiral protrusions 8. Each spiral protrusion 8 extends outward from the second sealing ring 32. At the mating surface between the water tank upper shell 1 and the irregular sealing ring 3, the four spiral protrusions 8 are exposed. Figure 11 As shown, the four exposed spiral protrusions 8 are fitted with the sealing ring 3 with zero clearance or interference fit. Other exposed contact surfaces also use zero clearance or interference fit, eliminating sealing grooves, other assembly recesses, and gaps, making cleaning convenient. This prevents external water vapor and other dirt from penetrating the mating surfaces, facilitating overall cleaning.

[0056] like Figure 8 As shown, the third sealing ring 33 has a top 331 and a bottom 332.

[0057] The top 331 of the third sealing ring has an L-shaped cross-section. The first surface 3311 of the top of the third sealing ring is located below the spiral protrusions 8 and the outer blocking protrusions 7, and its outer side engages with the lower end of the second sealing ring 32. The second surface 3312 of the top of the third sealing ring is located inside the spiral protrusions 8 and the outer blocking protrusions 7, which can further fix the sealing ring. The third sealing ring 33 is combined with the second sealing ring 32.

[0058] The bottom 332 of the third sealing ring has a triangular cross-section. The first bottom surface 3321 of the third sealing ring is joined to the first top surface 3311 of the third sealing ring. The second bottom surface 3322 of the third sealing ring is parallel to the side wall of the bottom shell 2 of the water tank. The third bottom surface 3323 of the third sealing ring extends from the lower end of the second bottom surface 3322 to the inner end of the first bottom surface 3321 of the third sealing ring. Figure 10As shown, there is a gain angle between the bottom third surface 3323 of the third sealing ring and the horizontal plane. This gain angle is acute; the larger the angle, the more beneficial it is for sealing. Preferably, the gain angle can be between 40 and 50 degrees.

[0059] like Figure 2 As shown, when the upper shell 1 of the water tank is tightened, the spiral protrusion 8 screws into the spiral groove of the lower shell 2, forming a spiral stroke. Thus, when the upper shell 1 and the lower shell 2 are tightened and untightened, the rotational friction is much less than the friction during linear up-and-down movement (i.e., during traditional radial sealing). This is more effective in preventing deformation during the tightening process.

[0060] The irregularly shaped sealing ring is first installed on the upper shell of the water tank, and then the upper shell is installed on the lower shell.

[0061] After installation, as Figure 12 As shown, the irregularly shaped sealing ring will form two interference fits (each interference fit includes, but is not limited to, one point). The lower interference fit is provided by the third sealing ring 33, which is used to seal the upper shell 1 and the lower shell 2 of the water tank. The upper interference fit is provided by the first sealing ring 31, which is used to cushion the impact when the upper shell 1 and the lower shell 2 of the water tank are tightened, making the tightening feel better.

[0062] When the water tank is tightened, the third surface 3323 at the bottom of the third sealing ring is in direct contact with the air inside the bottom shell 2 of the water tank. Without any hard object supporting it, it will not harden further under pressure. Therefore, the deformation rebound force is only caused by the strength of the sealing ring 3 material itself and will not be too great. Thus, even if the interference fit is increased, whether it is rotational or axial movement, the tightening force will not be too high.

[0063] When the water tank is loosened, because the third sealing ring 33 provides interference below, and the third surface 3323 at the bottom of the third sealing ring is not supported by any hard object, even if the interference is increased, the tightening force will not be too large, whether it is rotational or axial movement.

[0064] The rebound force generated by the linear deformation of the sealing ring is also close to linear. This means that there will be no large sudden changes in resistance whether tightening or loosening, which is more user-friendly.

[0065] When the ventilator's water tank is in operation, there will be a certain pressure inside (e.g., 20 hPa). In this embodiment, the sealing ring is in the direction of the pressure it bears, as shown below. Figure 12As shown, the arrows indicate the direction of the force exerted by the internal air pressure of the water tank on the sealing ring. The pressure in the first direction is the main cause of leakage. When this pressure is too high and exceeds the frictional force generated by the rebound force of the interference fit below the sealing ring 3, leakage will occur. However, the pressure in the second direction is beneficial, making the water tank seal in this embodiment more tight. Regarding the interference fit below the sealing ring, the third surface 3323 at the bottom of the third sealing ring directly contacts the air inside the water tank bottom shell 2, and the pressure inside the water tank causes the bottom 332 of the third sealing ring to compress towards the tank wall, thus optimizing the sealing effect using the internal pressure of the water tank. Specifically, the second direction will generate a component force perpendicular to the leakage direction. This component force is beneficial to increase the interference fit below the sealing ring 3, which will increase the frictional force preventing leakage. When the increase in frictional force is greater than the impact force in the second direction, theoretically, even if the internal pressure is infinitely high, leakage will not occur, if the strength of the involved parts is not considered.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A sealed water tank for a ventilator, comprising: The water tank upper shell (1), water tank bottom shell (2), and sealing ring (3) are characterized in that, The upper shell of the water tank (1) includes: an upper shell body (4) and an upper shell flange (6) extending downward along the axial direction below the upper shell body (4); wherein, The sealing ring (3) is used to fill the gap between the bottom surface of the upper shell body (4) and the top surface of the bottom shell (2) of the water tank and the gap between the upper shell flange (6) and the side wall of the bottom shell (2) of the water tank; There is a gain angle between the bottom surface of the sealing ring (3) and the horizontal plane; The sealing ring (3) is composed of a first sealing ring (31), a second sealing ring (32), and a third sealing ring (33); wherein, The first sealing ring (31) is used to fill the gap between the bottom surface of the upper shell body (4) of the water tank and the top surface of the bottom shell (2) of the water tank; The second sealing ring (32) is used to fill the gap between the upper shell flange (6) and the side wall of the bottom shell (2) of the water tank, and is provided with several internal anti-detachment grooves (9) and several through holes (10). The third sealing ring (33) and the second sealing ring (32) are combined to cover the bottom end of the upper shell flange (6). The angle between the bottom surface of the third sealing ring (33) and the horizontal plane is used as the gain angle, which is an acute angle.

2. The sealed water tank for a ventilator according to claim 1, characterized in that, The upper shell flange (6) is provided with a plurality of spiral protrusions (8) that are evenly distributed circumferentially and spirally upward in the axial direction and extend radially outward; the inner wall of the water tank bottom shell (2) is provided with spiral grooves that match the plurality of spiral protrusions (8); the sealing ring (3) is provided with a plurality of through holes (10); the plurality of spiral protrusions (8) extend through the through holes (10) to the spiral grooves of the water tank bottom shell (2).

3. The sealed water tank for a ventilator according to claim 2, characterized in that, The upper shell flange (6) is provided with a number of external blocking protrusions (7) that are evenly distributed in the circumference and extend outward in the radial direction near its bottom end. The sealing ring (3) is provided with a number of internal anti-detachment grooves (9). The number of external blocking protrusions (7) are respectively installed into the internal anti-detachment grooves (9).

4. The sealed water tank for a ventilator according to claim 1, characterized in that, The top of the side wall of the bottom shell (2) of the water tank is stepped, and the first layer of sealing ring (31) fills the gap between the stepped notch and the bottom surface of the upper shell (1) of the water tank.

5. The sealed water tank for a ventilator according to claim 3, characterized in that, The third sealing ring (33) includes a top (331) and a bottom (332) of the third sealing ring, wherein, The top (331) section of the third sealing ring is L-shaped; the first surface (3311) of the top of the third sealing ring is located below a number of spiral protrusions (8) and an external blocking protrusion (7), and its outer side is joined to the lower end of the second sealing ring (32); the second surface (3312) of the top of the third sealing ring is located inside the number of spiral protrusions (8) and the external blocking protrusion (7). The bottom (332) of the third sealing ring has a triangular cross section; the bottom first surface (3321) of the third sealing ring is joined with the top first surface (3311) of the third sealing ring; the bottom second surface (3322) of the third sealing ring is set parallel to the side wall of the bottom shell (2) of the water tank; the bottom third surface (3323) of the third sealing ring extends from the lower end of the bottom second surface (3322) of the third sealing ring to the inner end of the bottom first surface (3321) of the third sealing ring; the bottom third surface (3323) of the third sealing ring serves as the bottom surface of the sealing ring (3).

6. The sealed water tank for a ventilator according to claim 5, characterized in that, The spacing between any two adjacent external blocking protrusions (7) is the same; the spacing between any two spiral protrusions (8) is the same.

7. The sealed water tank for a ventilator according to claim 5, characterized in that, A spiral protrusion (8) is provided every two of the external blocking protrusions (7).

8. The sealed water tank for a ventilator according to claim 1, characterized in that, The sealing ring (3) and the parts in contact with it have a zero clearance fit or an interference fit.

9. A ventilator, characterized in that, Includes the sealed water tank for a ventilator as described in any one of claims 1-8.

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