Filter connection structure for a breathing apparatus

Abstract

The application provides a filter connecting structure for a breathing machine, and belongs to the technical field of medical breathing machines.The filter connecting structure comprises first connecting pipes located on both sides of the filter, second connecting pipes connected to the breathing machine and the gas conveying pipe, and the first connecting pipes are respectively used for being inserted into the corresponding second connecting pipes; a plurality of accommodating grooves are circumferentially formed on the outer circumferential surface of the first connecting pipe, and clamping blocks are slidably arranged in the accommodating grooves along the radial direction of the second connecting pipe; a driving mechanism for driving all the clamping blocks to slide outward at the same time is arranged on the first connecting pipe; the outer surface of the clamping block in the initial state is flush with the opening of the accommodating groove; a plurality of clamping grooves for inserting the outer end of the corresponding clamping block are formed on the inner circumferential surface of the second connecting pipe; and elastic blocks are arranged in the clamping grooves, and the outer surface of the elastic block in the natural state is flush with the opening of the clamping groove.The connecting structure can resist the vibration of the breathing machine during work, and improves the firmness and dismounting efficiency of the filter connecting structure.

Description

Technical Field

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

[0002] As a vital life support device, the performance and reliability of a ventilator are crucial to the treatment outcome for patients. The ventilator filter, a key component of the ventilator system, directly impacts the overall operating efficiency and filtration effectiveness of the ventilator through its connection structure design and performance.

[0003] Currently, the ends of the connecting tubes on both sides of the filter used in ventilators are threaded, and the two sides of the filter are connected to the connecting tubes and the gas delivery tubes of the ventilator through the threads.

[0004] However, this method of connection reduces the efficiency of disassembly and assembly, and the long-term vibration of the ventilator during use can easily cause the filter connection to loosen, affecting the normal operation of the ventilator. Summary of the Invention

[0005] The purpose of this invention is to provide a filter connection structure for ventilators, so as to solve the technical problems of reduced disassembly and assembly efficiency of existing filter connection methods, and the fact that the filter connection is prone to loosening due to the long-term working vibration of the ventilator, which affects the normal operation of the ventilator.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a filter connection structure for a ventilator is provided, including a first connecting tube located on both sides of the filter and a second connecting tube connected to the ventilator and the air delivery tube. The two first connecting tubes are respectively used to insert into the corresponding second connecting tubes. A plurality of receiving grooves are formed on the outer circumference of the first connecting tube. A locking block is slidably disposed in the receiving groove along the radial direction of the second connecting tube. A driving mechanism is provided on the first connecting tube for driving all locking blocks to slide outward simultaneously. The outer surface of the locking block in the initial state is flush with the opening of the receiving groove. A plurality of slots are formed on the inner circumference of the second connecting tube for the outer end of the corresponding locking block to be inserted. An elastic block is disposed in the slot. The outer surface of the elastic block in the natural state is flush with the opening of the slot.

[0007] In one possible implementation, based on the above technical solutions, 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 pipe and has an internal thread. The outer circumferential surface of the first connecting pipe is axially provided with a plurality of movable slots communicating with the corresponding receiving slots. The movable arc plate is laterally slidably disposed in the movable slots. The outer surface of one end of the movable arc plate is provided with a thread that is threadedly connected to the rotating ring. The other end of the movable arc plate is located inside the clamping block. The outer surface of the movable arc plate has an inclined surface for pressing the clamping block outward.

[0008] In one possible implementation, based on the above technical solutions, the card block is made of ferromagnetic material, a reset magnet is provided at the bottom of the card slot to attract the card block, and the movable arc plate is located between the card block and the reset magnet.

[0009] In one possible implementation, based on the above technical solutions, a common rotating frame is connected between the rotating rings on the two first connecting pipes. When the rotating frame rotates around the filter, the moving arc plates on both sides of the filter move simultaneously away from or towards the filter. The filter is provided with a positioning mechanism for fixing the rotating frame in two positions. When the rotating frame is fixed in one position, the locking block is in its initial state. When the rotating frame is fixed in the other position, the locking block is simultaneously located in the receiving groove and the slot.

[0010] In one possible implementation, based on the above technical solutions, the positioning mechanism includes positioning blocks and positioning components. The positioning blocks are two in number and fixed to the outer circumferential surface of the filter. The rotating frame is located between the two positioning blocks, and positioning slots for inserting the corresponding positioning blocks are provided on both sides of the rotating frame. The positioning components are disposed on the rotating frame and the two positioning blocks, and the positioning components are used to fix the corresponding positioning blocks in the positioning slots or to release them from fixation.

[0011] In one possible implementation, based on the above technical solutions, the positioning component includes an insert block and a positioning spring. The outer surface of the positioning block has a groove, the positioning spring is disposed in the groove, and the insert block is slidably disposed at the opening of the groove. When the positioning spring is in its natural state, the outer end of the insert block protrudes from the opening of the groove, and the outer end of the insert block is inclined toward one side of the rotating frame. The positioning groove on the rotating frame has a slot for the outer end of the insert block to be inserted.

[0012] In one possible implementation, based on the above technical solutions, the positioning component further includes a pressing rod, a pressing plate, and a return spring. The rotating frame has two sliding holes communicating with the corresponding slots. One end of the pressing rod is slidably disposed in the sliding hole. The pressing plate is fixed to the end of the pressing rod located outside the rotating frame. The return spring is connected between the pressing plate and the rotating frame. When the return spring is in its natural state, the inner end of the pressing rod is located in the sliding hole.

[0013] In one possible implementation, based on the above technical solutions, the first connecting pipe has multiple cavities connected to the corresponding receiving groove and moving groove. A pressing plate is slidably disposed in the cavity, and the side of the pressing plate facing the block is an inclined surface opposite to the inclined surface of the moving arc plate. A linkage component is provided between the pressing plate and the moving arc plate, and the linkage component is used to drive the pressing plate to move in the opposite direction when the moving arc plate slides.

[0014] In one possible implementation, based on the above technical solutions, the linkage component includes a linkage gear and two linkage racks. The linkage gear is rotatably connected within the cavity, and the linkage racks are respectively fixed to the movable arc plate and the extrusion plate. The two linkage racks are respectively meshed on both sides of the linkage gear.

[0015] In one possible implementation, based on the above technical solutions, the first connecting pipe is composed of multiple circumferentially distributed arc-shaped module plates, and the connections between adjacent arc-shaped module plates, as well as between the first connecting pipe and the filter, are detachable.

[0016] The beneficial effects of the filter connection structure for ventilators provided by the present invention are as follows: 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 receiving groove is aligned with the corresponding slot, and then drives the card block to be inserted into the slot through the driving mechanism. At the same time, the elastic block is compressed, which can resist the vibration during the operation of the ventilator and improve the firmness of the filter connection structure. In addition, the first connecting tube and the second connecting tube adopt the plug-in method, which does not require repeated rotation and improves the disassembly and assembly efficiency of the filter connection structure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1This is a schematic diagram of a filter connection structure for a ventilator provided in an embodiment of the present invention;

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

[0020] Figure 3 for Figure 2 A partially enlarged schematic diagram of the drive mechanism and linkage components provided in Part A;

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

[0022] Figure 5 This is a cross-sectional view of the arc-shaped module plate provided in an embodiment of the present invention.

[0023] The labels for the attached figures are as follows:

[0024] 1. Filter; 2. First connecting pipe; 21. Receiving groove; 22. Locking block; 23. Moving groove; 24. Reset magnet; 25. Cavity; 26. Arc-shaped module plate; 3. Second connecting pipe; 31. Locking groove; 32. Elastic block; 4. Drive 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. Pressing rod; 624. Pressing plate; 625. Reset spring; 7. Extrusion plate; 8. Linkage assembly; 81. Linkage gear; 82. Linkage rack. Detailed Implementation

[0025] To make the technical problems, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are only a part of the embodiments of this application, not all of them. The specific embodiments described herein are only used to explain the invention and are not intended to limit the invention. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] It should be further noted that the accompanying drawings and embodiments of the present invention mainly describe the concept of the present invention. Based on this concept, some specific forms and arrangements of connection relationships, positional relationships and power mechanisms may not be fully described. However, under the premise that those skilled in the art understand the concept of the present invention, they can implement the above-mentioned specific forms and arrangements in a well-known manner.

[0027] When a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0028] The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself. The terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention 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 the present invention.

[0029] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0030] The terms "first" and "second" 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 one or more of that feature. In the description of this invention, "a plurality of" means two or more, and "several" means one or more, unless otherwise explicitly specified.

[0031] The present invention will now describe a filter connection structure for a ventilator.

[0032] like Figures 1 to 3As shown, one embodiment of the present invention provides a filter connection structure for a ventilator, including a first connecting pipe 2 located on both sides of the filter 1 and a second connecting pipe 3 connected to the ventilator and the air delivery tube. The two first connecting pipes 2 are respectively used to insert into the corresponding second connecting pipe 3. The outer circumference of the first connecting pipe 2 is provided with a plurality of receiving grooves 21. The receiving grooves 21 are provided with locking blocks 22 that slide radially along the second connecting pipe 3. The first connecting pipe 2 is provided with a driving mechanism 4 for driving all locking blocks 22 to slide outward simultaneously. The outer surface of the locking block 22 in the initial state is flush with the opening of the receiving groove 21. The inner circumference of the second connecting pipe 3 is provided with a plurality of locking slots 31 for the outer ends of the corresponding locking blocks 22 to be inserted. The locking slots 31 are provided with elastic blocks 32. The outer surface of the elastic blocks 32 in the natural state is flush with the opening of the locking slots 31.

[0033] This embodiment provides a filter connection structure for a ventilator. 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 receiving groove 21 is aligned with the corresponding slot 31. Then, the driving mechanism 4 drives the locking block 22 to be inserted into the slot 31, while the elastic block 32 is compressed. This can resist the vibration of the ventilator during operation, improve the firmness of the filter 1 connection structure, and thus ensure the normal operation of the ventilator. In addition, the first connecting tube 2 and the second connecting tube 3 are connected by plugging, eliminating the need for repeated rotation and improving the disassembly and assembly efficiency of the filter 1 connection structure.

[0034] like Figures 2 to 3 As shown, based on the above embodiments, the present invention provides another specific embodiment as follows:

[0035] The drive 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 pipe 2 and has an internal thread. The outer circumferential surface of the first connecting pipe 2 is axially provided with a plurality of movable grooves 23 that communicate with the corresponding receiving grooves 21. The movable arc plate 42 is laterally slidably disposed in the movable grooves 23. The outer surface of one end of the movable arc plate 42 is provided with a thread that is threadedly connected to the rotating ring 41. The other end of the movable arc plate 42 is located inside the locking block 22. The outer surface of the movable arc plate 42 has an inclined surface for pressing the locking block 22 outward.

[0036] By rotating the rotating ring 41, all the movable arc plates 42 on the same first connecting pipe 2 can move simultaneously, thereby causing the movable arc plates 42 to simultaneously press the locking block 22 and insert it into the locking slot 31. The movement of the locking block 22 can be precisely controlled, which facilitates the connection and separation operation of the first connecting pipe 2 and the second connecting pipe 3. Furthermore, the drive mechanism 4 is set in the moving groove 23 and other structures on the outer circumference of the first connecting pipe 2. Compared with some complex external drive devices, this structural design is compact and saves space around the connection structure.

[0037] like Figures 2 to 3 As shown, based on the above embodiments, the present invention provides another specific embodiment as follows:

[0038] The card block 22 is made of ferromagnetic material. The bottom of the card slot 31 is provided with a reset magnet 24 that always attracts the card block 22. The movable arc plate 42 is located between the card block 22 and the reset magnet 24.

[0039] The reset magnet 24 can always attract the locking block 22. When the first connecting tube 2 is inserted into the second connecting tube 3, the reset magnet 24 can ensure the positional stability of the locking block 22 and prevent the locking block 22 from sliding outward and affecting the insertion of the first connecting tube 2 and the second connecting tube 3. When the first connecting tube 2 and the second connecting tube 3 are disassembled, the moving arc plate 42 gradually releases the pressure on the locking block 22. The reset magnet 24 can cooperate with the elastic block 32 to drive the locking block 22 to automatically reset to the initial state. This helps the filter 1 connection structure to be reused. 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, based on the above embodiments, the present invention provides another specific embodiment 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 moving arc plates 42 on both sides of the filter 1 move simultaneously away from or towards the filter 1. The filter 1 is provided with a positioning mechanism 6 for fixing the rotating frame 5 in two positions. When the rotating frame 5 is fixed in one position, the locking block 22 is in the initial state. When the rotating frame 5 is fixed in the other position, the locking block 22 is simultaneously located in the receiving groove 21 and the locking 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 move simultaneously in a direction away from or towards the filter 1. This ensures that the connection structures on both sides of the filter 1 can be connected or disassembled synchronously, making the operation more convenient and efficient. The positioning mechanism 6 fixes the rotating frame 5 in two different positions, corresponding to the initial state of the locking block 22 and the state of the locking block 22 being inserted into the locking slot 31, respectively. 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 preparing to disassemble, avoiding misoperation and improving the stability of the rotating frame 5 in both positions.

[0043] like Figure 4 As shown, based on the above embodiments, the present invention provides another specific embodiment as follows:

[0044] The positioning mechanism 6 includes positioning blocks 61 and positioning components 62. There are two positioning blocks 61 and they are fixed on the outer peripheral surface of the filter 1. The rotating frame 5 is located between the two positioning blocks 61. Positioning slots 51 for corresponding positioning blocks 61 to be inserted are opened on both sides of the rotating frame 5. The positioning components 62 are disposed on the rotating frame 5 and the two positioning blocks 61. The positioning components 62 are used to fix the corresponding positioning blocks 61 in the positioning slots 51 or to release them from fixation.

[0045] The positioning block 61 and positioning component 62 in the positioning mechanism 6 work together to stably fix the rotating frame 5 in two specific positions. The positioning block 61 is inserted into the positioning groove 51 of the rotating frame 5 and fixed by the positioning component 62 to prevent the rotating frame 5 from rotating accidentally during use, thereby ensuring the stability of the connection structure. Moreover, this positioning method makes the transition between the initial state and the connected state of the connection structure more precise. Only when the positioning component 62 is released can the rotating frame 5 rotate to another position to change the connection state, which helps to improve the reliability of the connection structure.

[0046] like Figure 4 As shown, based on the above embodiments, the present invention provides another specific embodiment as follows:

[0047] The positioning component 62 includes an insert block 621 and a positioning spring 622. The outer surface of the positioning block 61 has a groove 611, and the positioning spring 622 is disposed in the groove 611. The insert block 621 is slidably disposed at the opening of the groove 611. When the positioning spring 622 is in its 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 tilted toward one side of the rotating frame 5. The positioning groove 51 on the rotating frame 5 has a slot 52 for inserting the outer end of the insert block 621.

[0048] The positioning component 62 has a simple structure with no complex mechanical structure, which reduces the number of parts, lowers the probability of failure, and improves the reliability of the positioning mechanism 6.

[0049] like Figure 4 As shown, based on the above embodiments, the present invention provides another specific embodiment as follows:

[0050] The positioning assembly 62 also includes a pressing rod 623, a pressing plate 624, and a return spring 625. The rotating frame 5 has two sliding holes 53 that communicate with the corresponding slots 52. One end of the pressing rod 623 is slidably disposed 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 its natural state, the inner end of the pressing rod 623 is located in the sliding hole 53.

[0051] The positioning assembly 62 includes a pressing rod 623, a pressing plate 624, and a return spring 625. These components allow the operator to easily release the positioning by pressing the pressing plate 624, which in turn causes the pressing rod 623 to press against the insert block 621. The return spring 625 automatically resets the pressing rod 623 after the operation, facilitating the next positioning operation.

[0052] Furthermore, in this 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, making the operation more convenient.

[0053] like Figures 2 to 3 As shown, based on the above embodiments, the present invention provides another specific embodiment as follows:

[0054] The first connecting pipe 2 has multiple cavities 25 inside that connect to the corresponding receiving groove 21 and the moving groove 23. A pressing plate 7 is slidably arranged in the cavity 25. The side of the pressing plate 7 facing the locking block 22 is an inclined surface opposite to the inclined surface of the moving arc plate 42. A linkage component 8 is provided between the pressing plate 7 and the moving arc plate 42. The linkage component 8 is used to drive the pressing plate 7 to move in the opposite direction when the moving arc plate 42 slides.

[0055] When the moving arc plate 42 slides, it can drive the pressing plate 7 to move in the opposite direction through the linkage component 8. Both sides of the bottom of the card block 22 can be simultaneously forced to move downward into the card slot 31, avoiding damage to the card block 22 due to uneven force or difficulty in inserting it into the card slot 31, and without the need to add a power source or additional steps.

[0056] like Figures 2 to 3 As shown, based on the above embodiments, the present invention provides another specific embodiment 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, and the linkage racks 82 are fixed on the movable arc plate 42 and the pressing plate 7 respectively. The two linkage racks 82 are respectively meshed on both sides of the linkage gear 81.

[0058] The linkage gear 81 and the two linkage racks 82 can accurately convert the movement of the moving arc plate 42 into the reverse movement of the pressing plate 7, which can effectively transmit force and make the small displacement of the moving arc plate 42 accurately converted into the corresponding displacement of the pressing 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, based on the above embodiments, the present invention provides another specific embodiment as follows:

[0060] The first connecting pipe 2 is composed of multiple circumferentially distributed arc-shaped module plates 26, and the connections between adjacent arc-shaped module plates 26 and between the first connecting pipe 2 and the filter 1 are detachable.

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

[0062] This allows for individual maintenance or replacement when a 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, thus reducing maintenance costs.

[0063] The above are merely 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 within the protection scope of the present invention.

[0064] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0065] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

Claims

1. A filter connection structure for a breathing apparatus, comprising a first connection pipe (2) on both sides of a filter (1), a second connection pipe (3) connected to a breathing apparatus and a gas delivery pipe, characterized in that, Two first connecting pipes (2) are respectively inserted into corresponding second connecting pipes (3); a plurality of accommodating grooves (21) are circumferentially formed on the outer circumferential surface of the first connecting pipe (2), a clamping block (22) is slidably arranged in the accommodating groove (21) along the radial direction of the second connecting pipe (3), and a driving mechanism (4) for driving all clamping blocks (22) to slide outward simultaneously is arranged on the first connecting pipe (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 end of the corresponding clamping block (22) are formed on the inner circumferential surface of the second connecting pipe (3); an elastic block (32) is arranged 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); The driving mechanism (4) comprises a rotating ring (41) and a moving arc plate (42), the rotating ring (41) is coaxially and rotationally connected to the outside of the first connecting pipe (2) and has an internal thread, a plurality of moving grooves (23) which are in communication with the corresponding accommodating grooves (21) are axially formed on the outer circumferential surface of the first connecting pipe (2), the moving arc plate (42) is transversely and slidably arranged in the moving groove (23), the outer surface of one end of the moving arc plate (42) is provided with a thread which is threadedly connected with the rotating ring (41), and the other end of the moving arc plate (42) is located on the inner side of the clamping block (22); the outer surface of the moving arc plate (42) has an inclined surface for extruding the clamping block (22) outward; 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 moving arc plates (42) on both sides of the filter (1) simultaneously move away from or close to the filter (1); a positioning mechanism (6) for fixing the rotating frame (5) at two positions is arranged on the filter (1), when the rotating frame (5) is fixed at one of the two positions, the clamping block (22) is in the initial state, and when the rotating frame (5) is fixed at the other position, the clamping block (22) is in a state of simultaneously being located in the accommodating groove (21) and the clamping groove (31).

2. A filter connection structure for a respirator as defined in claim 1, wherein The clamping block (22) is made of ferromagnetic material, a reset magnet (24) for attracting the clamping block (22) at all times is arranged at the bottom of the clamping groove (31), and the moving arc plate (42) is located between the clamping block (22) and the reset magnet (24).

3. A filter connection structure for a respirator as defined in claim 1, wherein The positioning mechanism (6) comprises positioning blocks (61) and a positioning assembly (62), the positioning blocks (61) are fixed on the outer circumferential surface of the filter (1); the rotating frame (5) is located between the two positioning blocks (61), and positioning grooves (51) for inserting the corresponding positioning blocks (61) are formed on the two sides of the rotating frame (5); and the positioning assembly (62) is arranged on the rotating frame (5) and the two positioning blocks (61), and is used for fixing or releasing the corresponding positioning blocks (61) in the positioning grooves (51).

4. A filter connection structure for a respirator according to claim 3, wherein The positioning assembly (62) comprises an insertion block (621) and a positioning spring (622), a groove (611) is formed on the outer surface of the positioning block (61), the positioning spring (622) is arranged in the groove (611), and the insertion block (621) is slidingly arranged at the opening of the groove (611); when the positioning spring (622) is in a natural state, the outer end of the insertion block (621) protrudes out of the opening of the groove (611), and the outer end of the insertion block (621) is obliquely arranged towards one side of the rotating frame (5); and an insertion groove (52) for inserting the outer end of the insertion block (621) is formed in the positioning groove (51) on the rotating frame (5).

5. A filter connection structure for a respirator as defined in claim 4, wherein The positioning assembly (62) further comprises a pressing rod (623), a pressing plate (624) and a reset spring (625), two slide holes (53) which are communicated with the corresponding insertion grooves (52) are formed on the rotating frame (5), one end of the pressing rod (623) is slidingly arranged in the slide hole (53), and the pressing plate (624) is fixed to the end of the pressing rod (623) which is located outside the rotating frame (5); the reset spring (625) is connected between the pressing plate (624) and the rotating frame (5); and when the reset spring (625) is in a natural state, the inner end of the pressing rod (623) is located in the slide hole (53).

6. A filter connection structure for a respirator as defined in claim 1, wherein A plurality of cavities (25) which are communicated with the corresponding containing grooves (21) and moving grooves (23) are formed in the first connecting pipe (2), a pressing plate (7) is slidingly arranged in the cavity (25), the side of the pressing plate (7) which faces the clamping block (22) is a slope which is opposite to the inclined surface of the moving arc plate (42); a linkage assembly (8) is arranged between the pressing plate (7) and the moving arc plate (42), and the linkage assembly (8) is used for driving the pressing plate (7) to move reversely when the moving arc plate (42) slides.

7. A filter connection structure for a respirator as defined in claim 6, wherein The linkage assembly (8) comprises a linkage gear (81) and two linkage racks (82), the linkage gear (81) is rotationally connected in the cavity (25), the linkage racks (82) are respectively fixed on the moving arc plate (42) and the pressing plate (7), and the two linkage racks (82) are respectively engaged on the two sides of the linkage gear (81).

8. A filter connection structure for a respirator as defined in claim 7, wherein The first connecting pipe (2) is composed of a plurality of circumferentially distributed arc-shaped module plates (26), and the adjacent arc-shaped module plates (26) and the first connecting pipe (2) and the filter (1) are detachably connected.

Images