Filter connecting structure for breathing machine

Abstract

The invention provides a filter connecting structure for a breathing machine, and belongs to the technical field of medical breathing machines, the filter connecting structure for the breathing machine comprises first connecting pipes located on the two sides of a filter, and a second connecting pipe connected to the breathing machine and an air conveying pipe; the first connecting pipes are respectively inserted into the corresponding second connecting pipes; a plurality of containing grooves are formed in the periphery of the peripheral face of the first connecting pipe, clamping blocks are arranged in the containing grooves in the radial direction of the second connecting pipe in a sliding mode, and a driving mechanism used for driving all the clamping blocks to slide outwards at the same time is arranged on the first connecting pipe. The outer surface of the clamping block in an initial state is flush with the opening of the accommodating groove; a plurality of clamping grooves allowing the outer ends of the corresponding clamping blocks to be inserted therein are formed in the inner circumferential face of the second connecting pipe. An elastic block is arranged in the clamping groove, and the outer surface of the elastic block in a natural state is flush with the opening of the clamping groove. The connecting structure can resist vibration generated when the breathing machine works, and the firmness degree and the disassembly and assembly efficiency of the filter connecting structure are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of medical ventilators, and more specifically, relates to a filter connection structure for a ventilator. Background Art

[0002] As an important life support device, the performance and reliability of the ventilator are crucial to the treatment effect of the patient. As a key component of the ventilator system, the design and performance of the connection structure of the ventilator filter directly affect the overall operating efficiency and filtering effect of the ventilator.

[0003] At present, the ends of the connecting pipes on both sides of the existing ventilator filter are both provided with threads, and the two sides of the filter are respectively connected to the connecting pipe and the air supply pipe of the ventilator through the threads.

[0004] However, the efficiency of assembly and disassembly of this type of connection is reduced, and the working vibration caused by long-term use of the ventilator can easily cause the filter connection to loosen, affecting the normal operation of the ventilator. Summary of the invention

[0005] The purpose of the present invention is to provide a filter connection structure for a respirator to solve the technical problems in the prior art that the existing filter connection method has reduced disassembly and assembly efficiency, and that the working vibration caused by long-term use of the respirator easily causes the filter connection to loosen, thereby affecting the normal operation of the respirator.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a filter connection structure for a ventilator, comprising a first connecting tube located on both sides of the filter, and a second connecting tube connected to the ventilator and the air supply pipe, the two first connecting tubes are respectively used to be inserted into the corresponding second connecting tubes; a plurality of accommodating grooves are provided on the circumference of the outer circumference of the first connecting tube, a card block is provided in the accommodating groove for radial sliding along the second connecting tube, and a driving mechanism for driving all the card blocks to slide outward at the same time is provided on the first connecting tube; the outer surface of the card block in the initial state is flush with the opening of the accommodating groove; a plurality of card slots for the outer ends of the corresponding card blocks to be inserted are provided on the inner circumference of the second connecting tube; an elastic block is provided in the card slot, and the outer surface of the elastic block in the natural state is flush with the opening of the card slot.

[0007] In combination with the above technical solution, in a possible implementation, the driving mechanism includes a rotating ring and a movable arc plate, the rotating ring is coaxially rotatably connected to the outside of the first connecting tube and has an internal thread, the outer peripheral surface of the first connecting tube is axially opened with a plurality of movable grooves connected to the corresponding accommodating grooves, the movable arc plate is laterally slidably arranged in the movable groove, the outer surface of one end of the movable arc plate is provided with a thread connected to the thread of the rotating ring, and the other end of the movable arc plate is located on the inner side of the clamping block; the outer surface of the movable arc plate has an inclined surface for squeezing the clamping block outward.

[0008] In combination with the above technical solution, in a possible implementation, the card block is made of ferromagnetic material, a reset magnet that always attracts the card block is provided at the bottom of the card slot, and the movable arc plate is located between the card block and the reset magnet.

[0009] In combination with the above technical solution, in a possible implementation, the same rotating frame is connected between the rotating rings on the two first connecting tubes, and when the rotating frame rotates around the filter, the movable arc plates on both sides of the filter move simultaneously in a direction away from or close to the filter; a positioning mechanism for fixing the rotating frame in two positions is provided on the filter, and when the rotating frame is fixed in one of the positions, the blocking block is in an initial state; when the rotating frame is fixed in the other position, the blocking block is in a state of being simultaneously located in the accommodating groove and the blocking groove.

[0010] In combination with the above technical solution, in a possible implementation, the positioning mechanism includes a positioning block and a positioning assembly, the positioning block has two and is fixed on the outer peripheral surface of the filter; the rotating frame is located between the two positioning blocks, and positioning grooves for inserting the corresponding positioning blocks are opened on both sides of the rotating frame. The positioning assembly is arranged on the rotating frame and the two positioning blocks, and the positioning assembly is used to fix the corresponding positioning block in the positioning groove or release the fixation.

[0011] In combination with the above technical solution, in a possible implementation, the positioning assembly includes an insert block and a positioning spring, the outer surface of the positioning block is provided with a groove, the positioning spring is arranged in the groove, and the insert block is slidably arranged at the opening of the groove; when the positioning spring is in a natural state, the outer end of the insert block protrudes from the groove opening, and the outer end of the insert block is inclined toward one side of the rotating frame; and a slot for inserting the outer end of the insert block is provided in the positioning groove on the rotating frame.

[0012] In combination with the above technical solution, in a possible implementation, the positioning assembly also includes a pressing rod, a pressing plate and a return spring, the rotating frame is provided with two sliding holes connected to the corresponding slots, one end of the pressing rod is slidably arranged in the sliding hole, and the pressing plate is fixed to the end of the pressing rod located on the outside of the rotating frame; the return spring is connected between the pressing plate and the rotating frame; when the return spring is in a natural state, the inner end of the pressing rod is located in the sliding hole.

[0013] In combination with the above technical solution, in a possible implementation method, a plurality of cavities connected to the corresponding accommodating grooves and the movable grooves are opened inside the first connecting tube, and an extrusion plate is slidably arranged in the cavity, and the side of the extrusion plate facing the blocking block is an inclined surface opposite to the inclined surface of the movable arc plate; a linkage component is arranged between the extrusion plate and the movable arc plate, and the linkage component is used to drive the extrusion plate to move in the opposite direction when the movable arc plate slides.

[0014] In combination with the above technical solution, in a possible implementation method, the linkage assembly includes a linkage gear and two linkage racks, the linkage gear is rotatably connected in the cavity, the linkage racks are respectively fixed on the movable arc plate and the extrusion plate, and the two linkage racks are respectively meshed on both sides of the linkage gear.

[0015] In combination with the above technical solution, in a possible implementation, the first connecting pipe is composed of a plurality of circumferentially distributed arc-shaped module plates, and adjacent arc-shaped module plates and the first connecting pipe and the filter are all detachably connected.

[0016] The beneficial effect of a filter connection structure for a respirator provided by the present invention is that: compared with the prior art, when connecting the filter, the present invention inserts the first connecting tube into the corresponding second connecting tube, so that the accommodating groove is directly opposite to the corresponding card slot, and then the card block is driven by the driving mechanism to be inserted into the card slot. At the same time, the elastic block is compressed to resist the vibration of the respirator when working, thereby improving the firmness of the filter connection structure. The first connecting tube and the second connecting tube are plug-in, and there is no need for repeated rotation, thereby improving the disassembly and assembly efficiency of the filter connection structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1A schematic structural diagram of a filter connection structure for a respirator provided in an embodiment of the present invention;

[0019] Figure 2 A partial cross-sectional view of a first connecting pipe and a second connecting pipe in a fixed state provided by an embodiment of the present invention;

[0020] Figure 3 for Figure 2 Part A of the figure provides a partial enlarged schematic diagram of the drive mechanism and linkage assembly;

[0021] Figure 4 A partial cross-sectional view of a rotating frame and a positioning mechanism provided in an embodiment of the present invention;

[0022] Figure 5 A cross-sectional view of a curved module plate provided in an embodiment of the present invention.

[0023] Among them, the reference numerals in the figures are as follows:

[0024] 1. Filter; 2. First connecting tube; 21. Accommodating groove; 22. Block; 23. Moving groove; 24. Reset magnet; 25. Cavity; 26. Arc module plate; 3. Second connecting tube; 31. Block; 32. Elastic block; 4. Driving mechanism; 41. Rotating ring; 42. Moving arc plate; 5. Rotating frame; 51. Positioning groove; 52. Slot; 53. Sliding hole; 6. Positioning mechanism; 61. Positioning block; 611. Groove; 62. Positioning assembly; 621. Insert block; 622. Positioning spring; 623. Press rod; 624. Press plate; 625. Reset spring; 7. Extrusion plate; 8. Linkage assembly; 81. Linkage gear; 82. Linkage rack. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of this application.

[0026] It should be further explained that the drawings and implementation modes of the present invention mainly describe the concept of the present invention. On the basis of this concept, the specific forms and settings of some connection relationships, positional relationships and power mechanisms may not be fully described. However, on the premise that those skilled in the art understand the concept of the present invention, those skilled in the art can implement the above-mentioned specific forms and settings in a well-known manner.

[0027] When an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0028] The directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself. The directions or positional relationships indicated by the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0029] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, and the spatially relative descriptions used here are interpreted accordingly.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, and "several" means one or more, unless otherwise clearly and specifically defined.

[0031] A filter connection structure for a breathing machine provided by the present invention is now described.

[0032] like Figures 1 to 3As shown, an embodiment of the present invention provides a filter connection structure for a ventilator, comprising a first connecting tube 2 located on both sides of a filter 1, and a second connecting tube 3 connected to the ventilator and the air supply pipe, wherein the two first connecting tubes 2 are respectively used to be inserted into the corresponding second connecting tubes 3; a plurality of receiving grooves 21 are provided on the circumference of the outer circumference of the first connecting tube 2, and a clamping block 22 is provided in the accommodating groove 21 for radial sliding along the second connecting tube 3, and a driving mechanism 4 for driving all the clamping blocks 22 to slide outward at the same time is provided on the first connecting tube 2; the outer surface of the clamping block 22 in the initial state is flush with the opening of the accommodating groove 21; a plurality of clamping grooves 31 for inserting the outer ends of the corresponding clamping blocks 22 are provided on the inner circumference of the second connecting tube 3; an elastic block 32 is provided in the clamping groove 31, and the outer surface of the elastic block 32 in the natural state is flush with the opening of the clamping groove 31.

[0033] The filter connection structure for a respirator provided in the present embodiment is compared with the prior art. When connecting the filter 1, the first connecting tube 2 is inserted into the corresponding second connecting tube 3, so that the accommodating groove 21 is directly opposite to the corresponding clamping groove 31, and then the clamping block 22 is driven by the driving mechanism 4 to be inserted into the clamping groove 31. At the same time, the elastic block 32 is compressed to resist the vibration of the respirator when working, thereby improving the firmness of the filter 1 connection structure, thereby ensuring the normal operation of the respirator. The first connecting tube 2 and the second connecting tube 3 are plug-in, and there is no need to rotate repeatedly, thereby improving the disassembly and assembly efficiency of the filter 1 connection structure.

[0034] like Figures 2 to 3 As shown, the present invention provides a specific implementation method based on the above implementation method as follows:

[0035] The driving mechanism 4 includes a rotating ring 41 and a movable arc plate 42. The rotating ring 41 is coaxially rotatably connected to the outside of the first connecting tube 2 and has an internal thread. The outer peripheral surface of the first connecting tube 2 is axially opened with a plurality of movable grooves 23 connected to the corresponding accommodating grooves 21. The movable arc plate 42 is laterally slidably arranged in the movable grooves 23. The outer surface of one end of the movable arc plate 42 is provided with a thread threadedly connected to the rotating ring 41. The other end of the movable arc plate 42 is located on the inner side of the clamping block 22. The outer surface of the movable arc plate 42 has an inclined surface for squeezing the clamping block 22 outward.

[0036] By rotating the rotating ring 41, all the movable arc plates 42 on the same first connecting tube 2 can be moved at the same time, so that the movable arc plates 42 can squeeze the block 22 at the same time to insert it into the slot 31. The movement of the block 22 can be accurately controlled, which facilitates the connection and separation operations of the first connecting tube 2 and the second connecting tube 3; and the driving mechanism 4 is arranged in the structure such as the movable groove 23 on the outer peripheral surface of the first connecting tube 2. Compared with some external complex driving devices, this structural design is compact and saves space around the connecting structure.

[0037] like Figures 2 to 3 As shown, the present invention provides a specific implementation method based on the above implementation method as follows:

[0038] The clamping block 22 is made of ferromagnetic material. A reset magnet 24 is disposed at the bottom of the clamping slot 31 to always attract the clamping block 22 . The movable arc plate 42 is located between the clamping block 22 and the reset magnet 24 .

[0039] The reset magnet 24 can always attract the block 22. When the first connecting tube 2 is inserted into the second connecting tube 3, the reset magnet 24 can ensure the position stability of the block 22 and prevent the block 22 from sliding outward and affecting the connection between the first connecting tube 2 and the second connecting tube 3; and when the first connecting tube 2 and the second connecting tube 3 are disassembled, the movable arc plate 42 gradually cancels the squeezing of the block 22, and the reset magnet 24 can cooperate with the elastic block 32 and drive the block 22 to automatically reset to the initial state, which is conducive to the reuse of the connection structure of the filter 1. No additional reset operation is required when connecting next time, which improves the convenience of use.

[0040] like Figure 1 and Figure 4 As shown, the present invention provides a specific implementation method based on the above implementation method as follows:

[0041] The same rotating frame 5 is connected between the rotating rings 41 on the two first connecting pipes 2. When the rotating frame 5 rotates around the filter 1, the movable arc plates 42 on both sides of the filter 1 move simultaneously in a direction away from or close to the filter 1; a positioning mechanism 6 for fixing the rotating frame 5 at two positions is provided on the filter 1. When the rotating frame 5 is fixed at one of the positions, the clamping block 22 is in an initial state; when the rotating frame 5 is fixed at the other position, the clamping block 22 is in a state of being located in both the accommodating groove 21 and the clamping groove 31.

[0042] When the rotating frame 5 rotates around the filter 1, the movable arc plates 42 on both sides of the filter 1 can be simultaneously moved away from or close to the filter 1. In this way, the connection structures on both sides of the filter 1 can be connected or disassembled synchronously, making the operation more convenient and efficient. The rotating frame 5 is fixed in two different positions by the positioning mechanism 6, corresponding to the initial state of the block 22 and the state of the block 22 inserted into the card slot 31. This allows the operator to clearly know the current state of the connection structure, whether it is in a state of preparing to connect, already connected or ready to be disassembled, to avoid misoperation, and can improve the stability of the rotating frame 5 in two positions.

[0043] like Figure 4 As shown, the present invention provides a specific implementation method based on the above implementation method as follows:

[0044] The positioning mechanism 6 includes a positioning block 61 and a positioning assembly 62. The positioning block 61 has two and is fixed to the outer peripheral surface of the filter 1. The rotating frame 5 is located between the two positioning blocks 61. Positioning grooves 51 for inserting the corresponding positioning blocks 61 are opened on both sides of the rotating frame 5. The positioning assembly 62 is arranged on the rotating frame 5 and the two positioning blocks 61. The positioning assembly 62 is used to fix the corresponding positioning block 61 in the positioning groove 51 or release the fixation.

[0045] The cooperation of the positioning block 61 and the positioning assembly 62 in the positioning mechanism 6 can stably fix the rotating frame 5 at two specific positions. The positioning block 61 is inserted into the positioning slot 51 of the rotating frame 5 and fixed by the positioning assembly 62 to prevent the rotating frame 5 from accidentally rotating during use, thereby ensuring the stability of the connection structure; and this positioning method makes the connection structure more accurate in the conversion between the initial state and the connection state of the clamping block 22. Only when the positioning assembly 62 is released, the rotating frame 5 can be rotated to another position to achieve the change of the connection state, which helps to improve the reliability of the connection structure.

[0046] like Figure 4 As shown, the present invention provides a specific implementation method based on the above implementation method as follows:

[0047] The positioning assembly 62 includes an insert block 621 and a positioning spring 622. A groove 611 is provided on the outer surface of the positioning block 61. The positioning spring 622 is arranged in the groove 611. The insert block 621 is slidably arranged at the opening of the groove 611. When the positioning spring 622 is in a natural state, the outer end of the insert block 621 protrudes from the opening of the groove 611, and the outer end of the insert block 621 is inclined toward one side of the rotating frame 5. A slot 52 is provided in the positioning groove 51 on the rotating frame 5 for the outer end of the insert block 621 to be inserted.

[0048] The arrangement of the insert block 621 and the positioning spring 622 in the positioning assembly 62 enables the insert block 621 to protrude from the opening of the groove 611 under normal conditions. When the positioning block 61 is inserted into the positioning groove 51, the insert block 621 can be automatically inserted into the slot 52 of the rotating frame 5 to achieve positioning. The structure is simple and there is no complex mechanical structure, which reduces the number of parts and components, reduces the probability of failure, and improves the reliability of the positioning mechanism 6.

[0049] like Figure 4 As shown, the present invention provides a specific implementation method based on the above implementation method as follows:

[0050] The positioning assembly 62 also includes a pressing rod 623, a pressing plate 624 and a return spring 625. Two sliding holes 53 connected to the corresponding slots 52 are provided on the rotating frame 5. One end of the pressing rod 623 is slidably set in the sliding hole 53. The pressing plate 624 is fixed to the end of the pressing rod 623 located on the outside of the rotating frame 5; the return spring 625 is connected between the pressing plate 624 and the rotating frame 5; when the return spring 625 is in a natural state, the inner end of the pressing rod 623 is located in the sliding hole 53.

[0051] The arrangement of the pressing rod 623, pressing plate 624 and reset spring 625 in the positioning assembly 62 allows the operator to easily release the positioning by pressing the pressing plate 624 to drive the pressing rod 623 to squeeze the insert block 621. The reset spring 625 can automatically reset the pressing rod 623 after the operation, facilitating the next positioning operation.

[0052] Furthermore, in the present embodiment, there is only one pressing plate 624, and both ends of the pressing plate 624 are fixed to the outer ends of the two pressing rods 623 at the same time, so the operation is more convenient.

[0053] like Figures 2 to 3 As shown, the present invention provides a specific implementation method based on the above implementation method as follows:

[0054] A plurality of cavities 25 connected to the corresponding accommodating grooves 21 and the movable grooves 23 are provided inside the first connecting tube 2, and an extrusion plate 7 is slidably arranged in the cavity 25, and the side of the extrusion plate 7 facing the block 22 is an inclined surface opposite to the inclined surface of the movable arc plate 42; a linkage assembly 8 is arranged between the extrusion plate 7 and the movable arc plate 42, and the linkage assembly 8 is used to drive the extrusion plate 7 to move in the opposite direction when the movable arc plate 42 slides.

[0055] When the movable arc plate 42 slides, the extrusion plate 7 can be driven to move in the opposite direction through the linkage assembly 8, and the two sides of the bottom of the block 22 can be forced to move toward the lower slot 31 at the same time, avoiding the block 22 from being damaged or difficult to insert into the slot 31 due to uneven force, without adding a power source or additional steps.

[0056] like Figures 2 to 3 As shown, the present invention provides a specific implementation method based on the above implementation method as follows:

[0057] The linkage assembly 8 includes a linkage gear 81 and two linkage racks 82 . The linkage gear 81 is rotatably connected in the cavity 25 . The linkage racks 82 are respectively fixed on the moving arc plate 42 and the extrusion plate 7 . The two linkage racks 82 are respectively meshed on both sides of the linkage gear 81 .

[0058] The setting of the linkage gear 81 and the two linkage racks 82 can accurately convert the movement of the movable arc plate 42 into the reverse movement of the extrusion plate 7, and can effectively transmit force, so that the smaller displacement of the movable arc plate 42 can be accurately converted into the corresponding displacement of the extrusion plate 7, thereby improving the response speed and collaborative work efficiency between the internal components of the connection structure.

[0059] like Figure 2 and Figure 5 As shown, the present invention provides a specific implementation method based on the above implementation method as follows:

[0060] The first connecting pipe 2 is composed of a plurality of circumferentially distributed arc-shaped module plates 26 , and adjacent arc-shaped module plates 26 and the first connecting pipe 2 and the filter 1 are all detachably connected.

[0061] Specifically, the corresponding blocks 22, movable arc plates 42, extrusion plates 7 and linkage components 8 are located on the same arc module plate 26; the adjacent arc module plates 26 and the first connecting pipe 2 and the filter 1 are bonded, magnetically connected or other structures that can achieve detachable connection.

[0062] It is convenient to perform separate maintenance or replacement when a certain component is damaged. For example, if the structure on a certain arc-shaped module plate 26 is damaged, the module plate can be replaced separately without replacing the entire first connecting pipe 2, thereby reducing maintenance costs.

[0063] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0064] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0065] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

Claims

1. A filter connection structure for a breathing machine, comprising a first connecting pipe (2) located on both sides of a filter (1), and a second connecting pipe (3) connected to the breathing machine and an air supply pipe, characterized in that: The two first connecting tubes (2) are respectively used to be inserted into the corresponding second connecting tubes (3); a plurality of receiving grooves (21) are provided on the circumference of the outer circumference of the first connecting tube (2); a clamping block (22) is provided in the said accommodating groove (21) to slide radially along the second connecting tube (3); a driving mechanism (4) is provided on the first connecting tube (2) to drive all the clamping blocks (22) to slide outward at the same time; the outer surface of the clamping block (22) in the initial state is flush with the opening of the said accommodating groove (21); a plurality of clamping grooves (31) for the outer ends of the corresponding clamping blocks (22) to be inserted are provided on the inner circumference of the second connecting tube (3); an elastic block (32) is provided in the said clamping groove (31); the outer surface of the elastic block (32) in the natural state is flush with the opening of the said clamping groove (31).

2. A filter connection structure for a breathing machine as claimed in claim 1, characterized in that: The driving mechanism (4) comprises a rotating ring (41) and a movable arc plate (42); the rotating ring (41) is coaxially rotatably connected to the outside of the first connecting tube (2) and has an internal thread; the outer peripheral surface of the first connecting tube (2) is axially provided with a plurality of movable grooves (23) connected to the corresponding accommodating grooves (21); the movable arc plate (42) is laterally slidably arranged in the movable grooves (23); the outer surface of one end of the movable arc plate (42) is provided with a thread threadedly connected to the rotating ring (41); the other end of the movable arc plate (42) is located on the inner side of the clamping block (22); the outer surface of the movable arc plate (42) has an inclined surface for pressing the clamping block (22) outward.

3. A filter connection structure for a breathing machine as claimed in claim 2, characterized in that: The card block (22) is made of ferromagnetic material, a reset magnet (24) is provided at the bottom of the card slot (31) for always attracting the card block (22), and the movable arc plate (42) is located between the card block (22) and the reset magnet (24).

4. A filter connection structure for a breathing machine as claimed in claim 2, characterized in that: A same rotating frame (5) is connected between the rotating rings (41) on the two first connecting pipes (2); when the rotating frame (5) rotates around the filter (1), the movable arc plates (42) on both sides of the filter (1) simultaneously move in a direction away from or close to the filter (1); a positioning mechanism (6) is provided on the filter (1) for fixing the rotating frame (5) at two positions; when the rotating frame (5) is fixed at one of the positions, the clamping block (22) is in an initial state; when the rotating frame (5) is fixed at the other position, the clamping block (22) is in a state of being located in both the containing groove (21) and the clamping groove (31).

5. A filter connection structure for a breathing machine as claimed in claim 4, characterized in that: The positioning mechanism (6) comprises a positioning block (61) and a positioning assembly (62); the positioning block (61) has two and is fixed to the outer peripheral surface of the filter (1); the rotating frame (5) is located between the two positioning blocks (61); positioning grooves (51) for inserting the corresponding positioning blocks (61) are provided on both sides of the rotating frame (5); the positioning assembly (62) is arranged on the rotating frame (5) and the two positioning blocks (61); the positioning assembly (62) is used to fix the corresponding positioning block (61) in the positioning groove (51) or release the fixation.

6. A filter connection structure for a breathing machine as claimed in claim 5, characterized in that: The positioning assembly (62) comprises an insert block (621) and a positioning spring (622); a groove (611) is provided on the outer surface of the positioning block (61); the positioning spring (622) is arranged in the groove (611); the insert block (621) is slidably arranged at the opening of the groove (611); when the positioning spring (622) is in a natural state, the outer end of the insert block (621) protrudes out of the opening of the groove (611), and the outer end of the insert block (621) is inclined toward one side of the rotating frame (5); and a slot (52) is provided in the positioning groove (51) on the rotating frame (5) for the outer end of the insert block (621) to be inserted.

7. A filter connection structure for a breathing machine as claimed in claim 6, characterized in that: The positioning assembly (62) also includes a pressing rod (623), a pressing plate (624) and a return spring (625); the rotating frame (5) is provided with two sliding holes (53) connected to the corresponding slots (52); one end of the pressing rod (623) is slidably arranged in the sliding hole (53); the pressing plate (624) is fixed to the end of the pressing rod (623) located on the outside of the rotating frame (5); the return spring (625) is connected between the pressing plate (624) and the rotating frame (5); when the return spring (625) is in a natural state, the inner end of the pressing rod (623) is located in the sliding hole (53).

8. A filter connection structure for a breathing machine as claimed in claim 4, characterized in that: A plurality of cavities (25) are provided inside the first connecting tube (2) and are connected to the corresponding accommodating grooves (21) and the movable grooves (23). An extrusion plate (7) is slidably arranged in the cavity (25). The side of the extrusion plate (7) facing the clamping block (22) is an inclined surface opposite to the inclined surface of the movable arc plate (42). A linkage component (8) is provided between the extrusion plate (7) and the movable arc plate (42). The linkage component (8) is used to drive the extrusion plate (7) to move in the opposite direction when the movable arc plate (42) slides.

9. A filter connection structure for a breathing machine as claimed in claim 8, characterized in that: The linkage assembly (8) comprises a linkage gear (81) and two linkage racks (82); the linkage gear (81) is rotatably connected in the cavity (25); the linkage racks (82) are respectively fixed on the movable arc plate (42) and the extrusion plate (7); and the two linkage racks (82) are respectively meshed on both sides of the linkage gear (81).

10. A filter connection structure for a breathing machine as claimed in claim 9, characterized in that: The first connecting pipe (2) is composed of a plurality of circumferentially distributed arc-shaped module plates (26), and adjacent arc-shaped module plates (26) and the first connecting pipe (2) and the filter (1) are all detachably connected.

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