Filter device for breathing machine

Abstract

The present invention relates to the technical field of ventilators, and in particular to a filtering device for a ventilator, comprising a circular shell, a side of the circular shell being provided with a fan-shaped groove, the interior of the circular shell being rotatably connected to a rotating block, the upper circumferential surface of the rotating block being provided with two placement holes, the interiors of the placement holes being provided with an annular filter element, the top of the circular shell being fixedly connected to an air inlet pipe, and the side of the circular shell away from the fan-shaped groove being fixedly connected to an exhaust pipe; the present invention disconnects the air inlet pipe and the exhaust pipe from the placement shell through the action of a filter conversion mechanism, and reconnects the air inlet pipe and the exhaust pipe with a replaced annular filter element for filtration, thereby enabling the ventilator to replace the filter element in a working state, and ensuring normal filtration during the replacement process, thereby reducing the impact of the filter element replacement on the operation of the ventilator.

Description

Technical Field

[0001] The present invention relates to the technical field of ventilators, and in particular to a filtering device for ventilators. Background Art

[0002] In modern clinical medicine, ventilators, as an effective means of artificially replacing spontaneous ventilation, have been widely used in respiratory failure caused by various reasons, anesthesia respiratory management during major surgery, respiratory support therapy and emergency resuscitation, and they occupy a very important position in the field of modern medicine. During the working process of the ventilator, filtering equipment is needed to filter the airflow.

[0003] The patent document with announcement number CN112957829B announces a filtering device for a ventilator, including a left shell and a right shell, the right side wall of the left shell is in contact with the left side wall of the right shell, an annular plate is fixedly provided on the right end of the outer wall of the left shell, an annular groove is provided on the inner wall of the annular plate, and symmetrical limit blocks are fixedly provided on the left end of the outer wall of the right shell, the two limit blocks are slidably connected to the inner wall of the annular groove on one side away from the right shell, the two limit blocks are provided with cavities inside, and limiting mechanisms are fixedly provided inside the two cavities.

[0004] In the prior art, when filtering the airflow of a ventilator, the filter element is usually replaced by using the matching connection between the cannula and the sleeve. During the process of replacing the filter element, the airflow of the ventilator loses its filtering function, so that the airflow during the filter element replacement process cannot be filtered, affecting the normal operation of the ventilator. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a filter device for a breathing machine.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is: a filter device for a respirator, comprising a circular shell, a fan-shaped groove is provided on the side of the circular shell, a rotating block is rotatably connected inside the circular shell, two placement holes are provided on the rotating block along the circumferential direction, an annular filter element is provided inside the placement holes, and a limited position supporting mechanism is connected inside the placement holes;

[0007] An air intake pipe is fixedly connected to the top of the circular shell, and the air intake pipe is located above the corresponding placement hole. An exhaust pipe is fixedly connected to the side of the circular shell away from the fan-shaped groove. Two connecting holes are circumferentially provided on the side of the rotating block, and the connecting holes are respectively connected to the corresponding placement holes. One end of the exhaust pipe is connected to the corresponding connecting hole. A placement shell is arranged between the air intake pipe and the exhaust pipe, and a spare filter element is placed inside the placement shell. A filter conversion mechanism is connected to the placement shell.

[0008] Preferably, the filter conversion mechanism includes a first single-way tube and a second single-way tube, the first single-way tube is fixedly connected to one end of the placement shell, the first single-way tube is slidably inserted into the air intake pipe, a first through hole is provided on the first single-way tube, the first through hole is located inside the air intake pipe, an air intake hole is provided on the side of the first single-way tube close to the opening of the air intake pipe, the air intake hole is located at the bottom of the air intake pipe, the upper and lower sides of the air intake pipe are fixedly connected with first sealing rings, the first sealing rings are slidably sleeved on the first single-way tube, the second single-way tube is fixedly connected to the bottom of the placement shell, the second single-way tube is slidably inserted in On the exhaust pipe, a second through hole is formed on the second single-way pipe, the second through hole is located inside the exhaust pipe, an exhaust hole is formed on the side of the second single-way pipe close to the opening of the exhaust pipe, the exhaust hole is located at the bottom of the exhaust pipe, the upper and lower sides of the exhaust pipe are fixedly connected with second sealing rings, the second sealing rings are slidably mounted on the second single-way pipe, a sealing cover plate is threadedly connected to the opening at the other end of the placement shell, a mounting plate is fixedly connected to the circular shell, a hydraulic cylinder is fixedly installed on the mounting plate, a fixing bracket is fixedly connected to the placement shell, and the piston shaft of the hydraulic cylinder is fixedly connected to the bottom of the fixing bracket.

[0009] Preferably, a mounting strip is fixedly connected to the circular shell, a circular rod is fixedly connected to the top of the mounting strip, the circular rod is slidably inserted on the first single-way tube, a third through hole is opened on the circular rod, the third through hole is located at the top of the sliding insertion point of the circular rod and the first single-way tube, a third sealing ring is fixedly connected to the first single-way tube, the third sealing ring is slidably sleeved on the circular rod, and the third through hole is located inside the third sealing ring.

[0010] Preferably, two extrusion pins are slidably inserted into the end of the placement shell away from the sealing cover plate, one end of the extrusion pin is fixedly connected to a sliding bar, and two movable grooves are provided on the fixed bracket, one end of the sliding bar is slidably connected to the corresponding inside of the movable groove, and the inside of the movable groove is fixedly connected to a light rod, the light rod is slidably inserted on the corresponding sliding bar, and a first spring is sleeved on the light rod, and the first spring is fixedly connected between the corresponding sliding bar and the end of the movable groove away from the sealing cover plate.

[0011] Preferably, two first positioning holes are opened on the top of the rotating block along the circumferential direction, a first T-shaped frame is fixedly connected to the fixed bracket, a first positioning pin is fixedly connected to the first T-shaped frame, and the bottom end of the first positioning pin passes through the top of the circular shell and extends to the interior of the circular shell and is located in the corresponding first positioning hole.

[0012] Preferably, a second positioning pin is provided inside the fan-shaped groove, a second T-shaped frame is fixedly connected to the top of the second positioning pin, two limit pins are slidably inserted on the second T-shaped frame, the limit pins are fixedly connected to the top of the circular shell, a second spring is sleeved on the limit pin, the second spring is fixedly connected between the second T-shaped frame and the corresponding top end of the limit pin, two second positioning holes are opened in the circumferential direction on the top of the rotating block, and the bottom end of the second positioning pin is located inside the corresponding second positioning hole.

[0013] Preferably, the limiting support mechanism includes two rotating trays, and the two rotating trays are respectively rotatably connected at the bottom of the two placement holes, and the tops of the rotating trays are fixedly connected with cross limiting frames, and the bottoms of the annular filter elements are provided with cross grooves, and the cross limiting frames are respectively located in the corresponding cross grooves, and the rotating trays are connected with a driving rotation mechanism.

[0014] Preferably, the driving rotation mechanism includes an annular slide rail, which is fixedly connected to the bottom surface inside the circular shell, and an arc groove is provided on the annular slide rail, and the arc groove is located below the connection between the air intake pipe and the circular shell, and a matching slide rail is provided inside the arc groove, and the two rotating trays are respectively slidably connected to the annular slide rail and the matching slide rail, and a circular plate is fixedly connected to the bottom of the matching slide rail, and a circular groove is provided at the bottom of the circular shell, and the circular plate is rotatably connected to the inside of the circular groove, and a motor is fixedly installed on the bottom of the circular shell, and the output shaft of the motor is fixedly connected to the bottom of the circular plate.

[0015] Preferably, a circular groove is provided on the side surface of the top of the rotating tray, and two lifting grooves are provided on the side surface of the rotating block along the circumferential direction, the lifting grooves are communicated with the corresponding placement holes, a supporting bar is slidably connected to the inside of the lifting groove, one end of the supporting bar extends to the inside of the placement hole and is fixedly connected to a lifting ring, and the lifting ring is located in the circular groove.

[0016] Preferably, the other end of the supporting bar extends to the outside of the rotating block, and an annular clearance groove is provided on the inner side of the circular shell.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Through the action of the filter conversion mechanism, the air inlet pipe and the exhaust pipe are disconnected from the placement shell, and the air inlet pipe and the exhaust pipe are reconnected with the replaced annular filter element for filtration, so that the filter element can be replaced while the ventilator is in working state, and normal filtration is guaranteed during the replacement process, reducing the impact of the filter element replacement on the operation of the ventilator.

[0019] 2. When the air inlet hole and the air exhaust hole completely enter the interior of the air inlet pipe and the exhaust pipe respectively, the first through hole and the second through hole are respectively located inside the first sealing ring and the second sealing ring above for sealing and blocking, and the air inlet pipe and the exhaust pipe are connected with the placement shell under the action of the first single-way tube and the second single-way tube, and the airflow is filtered by the spare filter element placed inside the shell, thereby completing the filtration conversion.

[0020] 3. When the air inlet hole and the exhaust hole move toward the inside of the air inlet pipe and the exhaust pipe respectively and are connected, the first single-way tube moves upward synchronously along the sliding insertion point of the circular rod, so that the first single-way tube and the third through hole on the circular rod are connected, and the connection restriction between the first single-way tube and the placement shell is released to achieve normal connection, and the circular rod is slidably sealed by the third sealing ring, thereby ensuring the sealing during the connection between the third through hole and the inside of the first single-way tube.

[0021] 4. When replacing the spare filter element, the sealing cover is removed by rotating, so that the spare filter element loses the limit of the sealing cover, and the elastic extension of the first spring causes one end of the squeezing pin to squeeze the spare filter element, so that the spare filter element pops out along the opening of the housing, making it convenient for the staff to take and replace the spare filter element placed inside the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 For the present invention Figure 1 A schematic diagram of the structure enlargement at point A;

[0024] Figure 3 For the present invention Figure 1 A schematic diagram of the structure at B in FIG.

[0025] Figure 4 It is a schematic diagram of the first cross-sectional structure of the present invention;

[0026] Figure 5 For the present invention Figure 4 A schematic diagram of the structure at position C in FIG.

[0027] Figure 6 For the present invention Figure 4 A schematic diagram of the structure at D in FIG.

[0028] Figure 7 It is a schematic diagram of the second cross-sectional structure of the present invention;

[0029] Figure 8 For the present invention Figure 7 A schematic diagram of the structure at position E in FIG.

[0030] Fig. 9 It is a schematic diagram of the matching structure of the circular housing, the rotating block and the annular filter element of the present invention (the circular housing and the rotating block are cut);

[0031] Fig.10 For the present invention Fig. 9 A magnified schematic diagram of the structure at F in FIG.

[0032] Fig.11 It is a schematic diagram of the matching structure of the annular slide rail, the matching slide rail and the circular plate of the present invention;

[0033] Fig.12 It is an exploded schematic diagram of the first matching structure of the annular filter element, the rotating tray and the lifting ring of the present invention;

[0034] Fig.13 It is an exploded schematic diagram of the second matching structure of the annular filter element, the rotating tray and the lifting ring of the present invention.

[0035] In the figure: 1, circular shell; 2, fan-shaped groove; 3, rotating block; 4, placement hole; 5, annular filter element; 6, air inlet pipe; 7, exhaust pipe; 8, connecting hole; 9, placement shell; 10, spare filter element; 11, first single-way pipe; 12, second single-way pipe; 13, first through-hole; 14, air inlet hole; 15, first sealing ring; 16, second through-hole; 17, exhaust hole; 18, second sealing ring; 19, sealing cover plate; 20, mounting plate; 21, hydraulic cylinder; 22, fixing bracket; 23, mounting strip; 24, circular rod; 25, third through-hole; 26, third sealing ring; 27, Extrusion pin; 28, sliding bar; 29, movable groove; 30, bare rod; 31, first spring; 32, first positioning hole; 33, first T-frame; 34, first positioning pin; 35, second positioning pin; 36, second T-frame; 37, limit pin; 38, second spring; 39, second positioning hole; 40, rotating tray; 41, cross limit frame; 42, cross groove; 43, annular slide rail; 44, arc groove; 45, matching slide rail; 46, circular plate; 47, circular groove; 48, motor; 49, annular groove; 50, lifting groove; 51, supporting bar; 52, annular give way groove; 53, lifting ring. DETAILED DESCRIPTION

[0036] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0037] like Figures 1 to 13 A filter device for a respirator shown in the figure comprises a circular shell 1, a fan-shaped groove 2 is provided on the side of the circular shell 1, a rotating block 3 is rotatably connected inside the circular shell 1, two placement holes 4 are circumferentially provided on the rotating block 3, an annular filter element 5 is provided inside the placement holes 4, and a limited position supporting mechanism is connected inside the placement holes 4;

[0038] The top of the circular shell 1 is fixedly connected with an air inlet pipe 6, which is located above the corresponding placement hole 4. The side of the circular shell 1 away from the fan-shaped groove 2 is fixedly connected with an exhaust pipe 7. The side of the rotating block 3 is provided with two connecting holes 8 along the circumferential direction (such as Figure 3 and Fig.10 As shown, the connecting holes 8 are respectively connected to the corresponding placement holes 4, one end of the exhaust pipe 7 is connected to the corresponding connecting hole 8, a placement housing 9 is provided between the intake pipe 6 and the exhaust pipe 7, and a spare filter element 10 (as shown in FIG. Figure 5As shown), a filter conversion mechanism is connected to the placement shell 9; when working, the prior art usually uses the matching connection between the cannula and the sleeve to replace the filter element when filtering the airflow of the ventilator. In the process of replacing the filter element, the airflow of the ventilator loses its filtering function, so that the airflow during the filter element replacement process cannot be filtered, affecting the normal operation of the ventilator; the technical solution can solve the above problems, and the specific working method is as follows: the air intake pipe 6 and the exhaust pipe 7 are fixedly connected to the air intake end and the exhaust end of the ventilator respectively, and the airflow enters the interior of the circular shell 1 along the air intake pipe 6, and enters the corresponding annular filter element 5 along the placement hole 4 inside the circular shell 1. After the airflow is filtered by the annular filter element 5, it is discharged from the side of the annular filter element 5 and enters the exhaust pipe 7 along the corresponding connecting hole 8, thereby filtering the airflow. When the filtering effect of the annular filter element 5 inside the circular shell 1 is reduced and needs to be replaced, the airflow is filtered by the annular filter element 5. The filter conversion mechanism connects the air intake pipe 6 and the exhaust pipe 7 to the placement shell 9, and filters the airflow through the spare filter element 10 inside the placement shell 9, and as the air intake pipe 6 and the exhaust pipe 7 connect to the placement shell 9, the air intake pipe 6 and the exhaust pipe 7 are disconnected from the corresponding annular filter element 5, thereby performing a filter conversion, and after the filter conversion is completed, the positions of the two placement holes 4 are interchanged by rotating the rotating block 3, thereby replacing the annular filter element 5 and replacing the discarded annular filter element 5 through the fan-shaped groove 2, and when the replacement of the annular filter element 5 is completed, the air intake pipe 6 and the exhaust pipe 7 are disconnected from the placement shell 9 through the action of the filter conversion mechanism, and the air intake pipe 6 and the exhaust pipe 7 are reconnected with the replaced annular filter element 5 for filtration, so that the ventilator can replace the filter element in the working state, and ensure normal filtration during the replacement process, thereby reducing the impact of the filter element replacement on the operation of the ventilator.

[0039] As a further embodiment of the present invention, the filter conversion mechanism includes a first single-way tube 11 and a second single-way tube 12. The first single-way tube 11 is fixedly connected to one end of the housing 9 (such as Figure 5 As shown), the first single-way tube 11 is slidably inserted on the intake pipe 6, and a first through hole 13 is opened on the first single-way tube 11, and the first through hole 13 is located inside the intake pipe 6. An intake hole 14 is opened on the side of the first single-way tube 11 close to the opening of the intake pipe 6, and the intake hole 14 is located at the bottom of the intake pipe 6. The upper and lower sides of the intake pipe 6 are fixedly connected with first sealing rings 15, and the first sealing rings 15 are slidably sleeved on the first single-way tube 11. The second single-way tube 12 is fixedly connected to the bottom of the placement shell 9, and the second single-way tube 12 is slidably inserted on the exhaust pipe 7 (as shown Figure 6As shown, a second through hole 16 is provided on the second single-way tube 12, and the second through hole 16 is located inside the exhaust pipe 7. An exhaust hole 17 is provided on the side of the second single-way tube 12 close to the opening of the exhaust pipe 7, and the exhaust hole 17 is located at the bottom of the exhaust pipe 7. The upper and lower sides of the exhaust pipe 7 are fixedly connected with second sealing rings 18, and the second sealing rings 18 are slidably sleeved on the second single-way tube 12. A sealing cover plate 19 (as shown) is threadedly connected to the opening at the other end of the housing 9. Figure 2 As shown in the figure), a mounting plate 20 is fixedly connected to the circular shell 1, a hydraulic cylinder 21 is fixedly installed on the mounting plate 20, a fixing bracket 22 is fixedly connected to the placement shell 9, and the piston shaft of the hydraulic cylinder 21 is fixedly connected to the bottom of the fixing bracket 22; when working, the opening of the placement shell 9 is sealed by the sealing cover plate 19 to prevent airflow leakage, and the connection between the first through hole 13 and the intake pipe 6 and the second through hole 16 and the exhaust pipe 7 is ensured to be connected with the annular filter element 5 and the airflow is normally filtered, and the placement shell 9 is driven to rise vertically by the upward movement of the piston shaft of the hydraulic cylinder 21, so that the first single-way pipe 11 and the second single-way pipe 12 move upward along the sliding insertion positions of the intake pipe 6 and the exhaust pipe 7 respectively. , so that the first through hole 13 and the second through hole 16 move upward along the sliding insertion position of the intake pipe 6 and the exhaust pipe 7 respectively and gradually release the connection with the annular filter element 5, and at the same time, the intake hole 14 and the exhaust hole 17 move to the inside of the intake pipe 6 and the exhaust pipe 7 respectively and connect. When the intake hole 14 and the exhaust hole 17 completely enter the inside of the intake pipe 6 and the exhaust pipe 7 respectively, the first through hole 13 and the second through hole 16 are respectively located inside the first sealing ring 15 and the second sealing ring 18 above for sealing and blocking, and the intake pipe 6 and the exhaust pipe 7 are connected with the placement shell 9 under the action of the first single-way tube 11 and the second single-way tube 12, and the airflow is filtered by the spare filter element 10 placed inside the shell 9, thereby completing the filtration conversion.

[0040] As a further embodiment of the present invention, a mounting bar 23 (such as Figure 2 As shown, the top of the mounting bar 23 is fixedly connected to a round rod 24, the round rod 24 is slidably inserted on the first single-pass tube 11, and the round rod 24 is provided with a third through hole 25 (as shown in FIG. Figure 5As shown in the figure, the third through hole 25 is located at the top of the sliding insertion place of the circular rod 24 and the first single-way tube 11, and the first single-way tube 11 is fixedly connected with a third sealing ring 26, and the third sealing ring 26 is slidably sleeved on the circular rod 24, and the third through hole 25 is located inside the third sealing ring 26; during operation, when the first through hole 13 and the second through hole 16 are respectively connected with the inside of the intake pipe 6 and the exhaust pipe 7, the sliding insertion of the first single-way tube 11 by the circular rod 24 blocks the inside of the first single-way tube 11, so that when the intake pipe 6 and the exhaust pipe 7 are connected with the annular filter element 5, the connection between the placement housing 9 and the intake pipe 6 is limited, thereby reducing the use time and probability of the spare filter element 10, and during the filtration conversion and passing the spare filter element 10, the filter element 10 is used to filter the exhaust pipe 7 and the exhaust pipe 7. When filtering with the filter element 10, the filtering effect of the spare filter element 10 is guaranteed, when the first single-way tube 11 and the second single-way tube 12 move upward along the sliding insertion positions of the intake pipe 6 and the exhaust pipe 7 respectively, and the intake hole 14 and the exhaust hole 17 move toward the inside of the intake pipe 6 and the exhaust pipe 7 respectively and connect, the first single-way tube 11 moves upward synchronously along the sliding insertion position of the circular rod 24, so that the first single-way tube 11 and the third through hole 25 on the circular rod 24 are connected, the connection restriction between the first single-way tube 11 and the placement shell 9 is released and normal connection is performed, and the circular rod 24 is slidably sealed by the third sealing ring 26, so as to ensure the sealing during the internal connection between the third through hole 25 and the first single-way tube 11.

[0041] As a further embodiment of the present invention, two extrusion pins 27 are slidably inserted at one end of the housing 9 away from the sealing cover plate 19, and one end of the extrusion pin 27 is fixedly connected to a sliding bar 28 (such as Figure 8As shown in the figure, two movable grooves 29 are provided on the fixed bracket 22, one end of the sliding bar 28 is slidably connected to the corresponding movable groove 29, and a light rod 30 is fixedly connected to the inside of the movable groove 29, and the light rod 30 is slidably inserted on the corresponding sliding bar 28. A first spring 31 is sleeved on the light rod 30, and the first spring 31 is fixedly connected between the corresponding sliding bar 28 and the end of the movable groove 29 away from the sealing cover 19; when working, the spare filter element 10 is placed inside the placement housing 9 and the opening of the placement housing 9 is sealed by the sealing cover 19, and one end of the sealing cover 19 pushes the spare filter element 10 into the placement housing 9, and the spare filter element 10 One end of the squeezing pin 27 contacts and squeezes one end of the two squeezing pins 27, so that the squeezing pin 27 moves along the sliding plug-in part of the placement shell 9, and drives one end of the sliding bar 28 to move along the inside of the movable groove 29, and squeezes the first spring 31 on the light rod 30 to produce compression deformation. When the spare filter element 10 is replaced, the sealing cover plate 19 is removed by rotating, and the spare filter element 10 loses the limit of the sealing cover plate 19, and the elastic extension of the first spring 31 makes one end of the squeezing pin 27 squeeze the spare filter element 10, so that the spare filter element 10 pops out along the opening of the placement shell 9, which is convenient for the staff to take and replace the spare filter element 10 placed inside the shell 9.

[0042] As a further embodiment of the present invention, two first positioning holes 32 are formed on the top of the rotating block 3 along the circumferential direction (such as Figure 3 and Fig.10 As shown, a first T-shaped frame 33 (as shown in FIG. Figure 2 As shown in the figure, a first locating pin 34 is fixedly connected to the first T-shaped frame 33, and the bottom end of the first locating pin 34 passes through the top of the circular shell 1 and extends to the inside of the circular shell 1 and is located in the corresponding first locating hole 32; when working, the piston axis of the hydraulic cylinder 21 moves upward to drive the placement shell 9 to rise vertically, so that the intake pipe 6 and the exhaust pipe 7 are connected with the placement shell 9 under the action of the first single-way tube 11 and the second single-way tube 12, and the fixed bracket 22 is driven to move upward through the placement shell 9, so that the first T-shaped frame 33 drives the first locating pin 34 to rise and disengage from the corresponding first locating hole 32, thereby releasing the rotation limit of the rotating block 3 inside the circular shell 1, so that the rotating block 3 can be rotated and the annular filter element 5 can be replaced only after the filtering conversion is completed, preventing the staff from making misoperations when the spare filter element 10 is not filtering, and ensuring the normal filtering.

[0043] As a further embodiment of the present invention, a second positioning pin 35 (such as Figure 3As shown in the figure, the top of the second positioning pin 35 is fixedly connected with a second T-shaped frame 36, and two limiting pins 37 are slidably inserted on the second T-shaped frame 36. The limiting pins 37 are fixedly connected to the top of the circular shell 1. A second spring 38 is sleeved on the limiting pin 37. The second spring 38 is fixedly connected between the second T-shaped frame 36 and the top of the corresponding limiting pin 37. Two second positioning holes 39 are circumferentially provided on the top of the rotating block 3, and the bottom end of the second positioning pin 35 is located inside the corresponding second positioning hole 39. When working, when the first T-shaped frame 33 drives the first positioning pin 34 to rise and releases the rotation restriction of the rotating block 3, the staff moves the second T-shaped frame 33 upwards to release the rotation restriction of the rotating block 3. The T-shaped frame 36 causes the second T-shaped frame 36 to move along the sliding insertion of the limit pin 37 and squeeze the second spring 38 to produce compression deformation, so that the bottom end of the second positioning pin 35 is disengaged from the corresponding second positioning hole 39, and then the rotating block 3 is rotated and the annular filter element 5 is replaced. After the replacement, the second T-shaped frame 36 is released and the second positioning pin 35 is moved to another second positioning hole 39 under the elastic extension action of the second spring 38 to position the rotating block 3 again, ensuring that the first T-shaped frame 33 can accurately move to the corresponding first positioning hole 32 when driving the first positioning pin 34 to return to the initial position, thereby reducing equipment damage caused by work errors.

[0044] As a further embodiment of the present invention, the position limiting support mechanism includes two rotating trays 40 (such as Fig.10 As shown, two rotating trays 40 are respectively rotatably connected to the lower part of the two placement holes 4, and the tops of the rotating trays 40 are fixedly connected to a cross limit frame 41 (as shown in FIG. Fig.12 As shown), a cross groove 42 is provided at the bottom of the annular filter element 5, and a cross limiting frame 41 is respectively located in the corresponding cross groove 42, and a driving rotation mechanism is connected to the rotating tray 40; when working, the bottom of the annular filter element 5 in the placement hole 4 is supported and limited by the rotating tray 40, and the cross limiting frame 41 is used to limit the cross groove 42 at the bottom of the annular filter element 5. When the annular filter element 5 is located inside the circular shell 1 and connected with the intake pipe 6 and the exhaust pipe 7, the annular filter element 5 in the connected state is rotated by the action of the driving rotation mechanism, so that the side filter holes of the annular filter element 5 can rotate close to the corresponding connecting hole 8 during the rotation process to participate in the air flow filtration, thereby improving the filtering effect of the annular filter element 5.

[0045] As a further embodiment of the present invention, the driving rotation mechanism includes an annular slide rail 43, which is fixedly connected to the bottom surface inside the circular shell 1. An arc groove 44 is provided on the annular slide rail 43. The arc groove 44 is located below the connection between the air inlet pipe 6 and the circular shell 1. A matching slide rail 45 is provided inside the arc groove 44. Two rotating trays 40 are respectively slidably connected to the annular slide rail 43 and the matching slide rail 45. A circular plate 46 is fixedly connected to the bottom of the matching slide rail 45. A circular groove 47 is provided at the bottom of the circular shell 1. The circular plate 46 is rotatably connected to the inside of the circular groove 47. A motor 48 is fixedly installed at the bottom of the circular shell 1, and the output shaft of the motor 48 is fixedly connected to the bottom of the circular plate 46. When working, when the rotating tray 40 is slidably connected to the annular slide rail 43 and the matching slide rail 45, a circular plate 46 is fixedly connected to the bottom of the circular groove 47. On the matching slide rail 45, the circular plate 46 is driven to rotate inside the circular groove 47 through the rotation of the output shaft of the motor 48, and the matching slide rail 45 is driven to rotate inside the arc groove 44 through the circular plate 46. Through the sliding connection between the matching slide rail 45 and the corresponding rotating tray 40, the rotating tray 40 is rotated inside the placement hole 4, and the corresponding annular filter element 5 is synchronously rotated by limiting the cross groove 42 through the cross limit frame 41. Before the rotating block 3 rotates and the annular filter element 5 is replaced, the matching slide rail 45 is driven to rotate to the initial position through the output shaft of the motor 48, so that the matching slide rail 45 and the annular slide rail 43 form a complete circular shape, so that the two rotating trays 40 can move along the sliding connection and complete the position exchange.

[0046] As a further embodiment of the present invention, a circular groove 49 (such as Fig.12 As shown, two lifting grooves 50 are provided on the side of the rotating block 3 along the circumferential direction (as shown in FIG. Figure 1 As shown in the figure, the lifting groove 50 is connected with the corresponding placement hole 4, and the interior of the lifting groove 50 is slidably connected with a supporting bar 51, and one end of the supporting bar 51 extends to the interior of the placement hole 4 and is fixedly connected with a lifting ring 53, and the lifting ring 53 is located in the annular groove 49; when working, the supporting bar 51 is moved upward along the lifting groove 50, so that one end of the supporting bar 51 drives the lifting ring 53 to move upward from the annular groove 49, thereby supporting the bottom of the annular filter element 5 and lifting it upward, so that the annular filter element 5 moves upward along the corresponding placement hole 4, which is convenient for the staff to take and replace the annular filter element 5.

[0047] As a further embodiment of the present invention, the other end of the support bar 51 extends to the outside of the rotating block 3, and an annular clearance groove 52 is provided on the inner side of the circular shell 1; when working, the support bar 51 extends out of one end of the rotating block 3 to facilitate the staff to grasp and move the support bar 51 (such as Figure 1As shown), when the supporting bar 51 rotates with the rotating block 3 through the annular clearance groove 52 opened on the circular shell 1, one end of the supporting bar 51 extending out of the rotating block 3 can move inside the annular clearance groove 52 to ensure the normal rotation of the rotating block 3.

[0048] Working principle of the present invention:

[0049] The air intake pipe 6 and the exhaust pipe 7 are fixedly connected to the air intake end and the exhaust end of the ventilator respectively. The airflow enters the interior of the circular shell 1 along the air intake pipe 6, and enters the corresponding annular filter element 5 along the placement hole 4 inside the circular shell 1. The airflow is filtered by the annular filter element 5 and then discharged from the side of the annular filter element 5, and enters the exhaust pipe 7 along the corresponding connecting hole 8, thereby filtering the airflow. When the filtering effect of the annular filter element 5 inside the circular shell 1 is reduced and needs to be replaced, the air intake pipe 6 and the exhaust pipe 7 are connected to the placement shell 9 through the action of the filter conversion mechanism, and the airflow is filtered by the spare filter element 10 inside the placement shell 9, and as the air intake pipe 6 and the exhaust pipe 7 are connected to the placement shell 9 is connected, and the connection between the air intake pipe 6 and the exhaust pipe 7 and the corresponding annular filter element 5 is disconnected, thereby performing a filtering conversion, and after the filtering conversion is completed, the positions of the two placement holes 4 are interchanged by rotating the rotating block 3, so that the annular filter element 5 is replaced and the discarded annular filter element 5 is replaced through the fan-shaped groove 2. When the replacement of the annular filter element 5 is completed, the air intake pipe 6 and the exhaust pipe 7 are disconnected from the placement shell 9 through the action of the filtering conversion mechanism, and the air intake pipe 6 and the exhaust pipe 7 are reconnected with the replaced annular filter element 5 for filtering, so that the ventilator can replace the filter element in the working state, and ensure normal filtration during the replacement process, thereby reducing the impact of the filter element replacement on the operation of the ventilator.

[0050] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may have various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention to be protected, and the scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A filter device for a breathing machine, comprising a circular housing (1), characterized in that: A fan-shaped groove (2) is provided on the side of the circular shell (1), a rotating block (3) is rotatably connected inside the circular shell (1), two placement holes (4) are provided on the rotating block (3) along the circumferential direction, an annular filter element (5) is provided inside each of the placement holes (4), and a limited position supporting mechanism is connected inside the placement holes (4); The top of the circular shell (1) is fixedly connected to an air intake pipe (6), the air intake pipe (6) is located above the corresponding placement hole (4), the side of the circular shell (1) away from the fan-shaped groove (2) is fixedly connected to an exhaust pipe (7), the side of the rotating block (3) is provided with two connecting holes (8) along the circumferential direction, the connecting holes (8) are respectively connected to the corresponding placement holes (4), one end of the exhaust pipe (7) is connected to the corresponding connecting hole (8), a placement shell (9) is arranged between the air intake pipe (6) and the exhaust pipe (7), a spare filter element (10) is placed inside the placement shell (9), and a filter conversion mechanism is connected to the placement shell (9); The filter conversion mechanism comprises a first single-way tube (11) and a second single-way tube (12); the first single-way tube (11) is fixedly connected to one end of the placement shell (9); the first single-way tube (11) is slidably inserted into the intake pipe (6); a first through hole (13) is provided on the first single-way tube (11); the first through hole (13) is located inside the intake pipe (6); an intake hole (14) is provided on a side of the first single-way tube (11) close to the opening of the intake pipe (6); the intake hole (14) is located at the bottom of the intake pipe (6); first sealing rings (15) are fixedly connected to the upper and lower sides of the intake pipe (6); the first sealing rings (15) are slidably sleeved on the first single-way tube (11); the second single-way tube (12) is fixedly connected to the bottom of the placement shell (9); the second single-way tube (12) is slidably inserted into the exhaust pipe (7), a second through hole (16) is provided on the second single-way tube (12), the second through hole (16) is located inside the exhaust pipe (7), an exhaust hole (17) is provided on the side of the second single-way tube (12) close to the opening of the exhaust pipe (7), the exhaust hole (17) is located at the bottom of the exhaust pipe (7), the upper and lower sides of the exhaust pipe (7) are fixedly connected with second sealing rings (18), the second sealing rings (18) are slidably sleeved on the second single-way tube (12), a sealing cover plate (19) is threadedly connected to the opening at the other end of the placement shell (9), a mounting plate (20) is fixedly connected to the circular shell (1), a hydraulic cylinder (21) is fixedly mounted on the mounting plate (20), a fixed bracket (22) is fixedly connected to the placement shell (9), and the piston shaft of the hydraulic cylinder (21) is fixedly connected to the bottom of the fixed bracket (22); The limit support mechanism comprises two rotating trays (40), the two rotating trays (40) are respectively rotatably connected to the lower part of the two placement holes (4), the top of each rotating tray (40) is fixedly connected to a cross limit frame (41), the bottom of each annular filter element (5) is provided with a cross groove (42), the cross limit frame (41) is respectively located in the corresponding cross groove (42), and the rotating tray (40) is connected to a driving rotation mechanism; The driving rotation mechanism comprises an annular slide rail (43), the annular slide rail (43) being fixedly connected to the bottom surface inside the circular shell (1), the annular slide rail (43) being provided with an arc groove (44), the arc groove (44) being located below the connection point between the air intake pipe (6) and the circular shell (1), a matching slide rail (45) being provided inside the arc groove (44), the two rotating trays (40) being slidably connected to the annular slide rail (43) and the matching slide rail (45) respectively, a circular plate (46) being fixedly connected to the bottom of the matching slide rail (45), a circular groove (47) being provided at the bottom of the circular shell (1), the circular plate (46) being rotatably connected to the inside of the circular groove (47), a motor (48) being fixedly installed at the bottom of the circular shell (1), and an output shaft of the motor (48) being fixedly connected to the bottom of the circular plate (46).

2. A filter device for a breathing machine according to claim 1, characterized in that: The circular shell (1) is fixedly connected to a mounting bar (23), the top of the mounting bar (23) is fixedly connected to a circular rod (24), the circular rod (24) is slidably inserted on the first single-way tube (11), a third through hole (25) is opened on the circular rod (24), the third through hole (25) is located at the top of the location where the circular rod (24) and the first single-way tube (11) are slidably inserted, a third sealing ring (26) is fixedly connected to the first single-way tube (11), the third sealing ring (26) is slidably sleeved on the circular rod (24), and the third through hole (25) is located inside the third sealing ring (26).

3. A filter device for a breathing machine according to claim 1, characterized in that: Two extrusion pins (27) are slidably inserted at one end of the placement shell (9) away from the sealing cover plate (19), one end of the extrusion pin (27) is fixedly connected to a sliding bar (28), and two movable grooves (29) are provided on the fixed bracket (22), one end of the sliding bar (28) is slidably connected to the inside of the corresponding movable groove (29), and a light rod (30) is fixedly connected inside the movable groove (29), and the light rod (30) is slidably inserted on the corresponding sliding bar (28), and a first spring (31) is sleeved on the light rod (30), and the first spring (31) is fixedly connected between the corresponding sliding bar (28) and the end of the movable groove (29) away from the sealing cover plate (19).

4. A filter device for a breathing machine according to claim 1, characterized in that: Two first positioning holes (32) are formed on the top of the rotating block (3) along the circumferential direction; a first T-shaped frame (33) is fixedly connected to the fixed bracket (22); a first positioning pin (34) is fixedly connected to the first T-shaped frame (33); the bottom end of the first positioning pin (34) passes through the top of the circular shell (1) and extends into the interior of the circular shell (1) to be located in the corresponding first positioning hole (32).

5. A filter device for a breathing machine according to claim 4, characterized in that: A second positioning pin (35) is arranged inside the fan-shaped groove (2), the top of the second positioning pin (35) is fixedly connected to a second T-shaped frame (36), two limit pins (37) are slidably inserted on the second T-shaped frame (36), the limit pins (37) are fixedly connected to the top of the circular shell (1), a second spring (38) is sleeved on the limit pin (37), the second spring (38) is fixedly connected between the second T-shaped frame (36) and the top of the corresponding limit pin (37), the top of the rotating block (3) is provided with two second positioning holes (39) along the circumferential direction, and the bottom end of the second positioning pin (35) is located inside the corresponding second positioning hole (39).

6. A filter device for a breathing machine according to claim 1, characterized in that: A circular groove (49) is provided on the side surface of the top of the rotating tray (40), and two lifting grooves (50) are provided on the side surface of the rotating block (3) along the circumferential direction. The lifting grooves (50) are connected to the corresponding placement holes (4), and a supporting bar (51) is slidably connected inside the lifting groove (50). One end of the supporting bar (51) extends to the inside of the placement hole (4) and is fixedly connected to a lifting ring (53). The lifting ring (53) is located in the circular groove (49).

7. A filter device for a breathing machine according to claim 6, characterized in that: The other end of the supporting bar (51) extends to the outside of the rotating block (3), and an annular clearance groove (52) is provided on the inner side of the circular shell (1).

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