High-temperature steam medical disinfection cabinet with air purification circulation mechanism

Abstract

The invention belongs to the technical field of medical disinfection cabinets, and particularly discloses a high-temperature steam medical disinfection cabinet with an air purification circulation mechanism, which comprises a disinfection cabinet body, an air treatment box is arranged in the disinfection cabinet body, a main heater is arranged on the side edge of the bottom of the air treatment box, and an electrostatic hanging rod is arranged on one side of the air treatment box. A waste box arranged side by side with the main heater is arranged below the electrostatic hanging rod, and a high-temperature storage box is arranged above the main heater; the electrostatic adsorption and vibration self-cleaning technology is integrated, efficient air purification is achieved, and manual maintenance is reduced; heat recovery preheating and steam track optimization are adopted, and the heat efficiency is improved; water vapor compression separation and filter element dehydration design are combined, so that the humidity is accurately controlled; the double heaters cooperate with the heat storage module, heat energy is allocated according to needs, intelligent piezoelectric driving and multi-valve linkage are achieved, and it is guaranteed that disinfection is free of dead corners; the modular layout prolongs the service life of equipment and improves the space utilization rate.

Description

Technical Field

[0001] The present invention relates to the technical field of medical disinfection cabinets, in particular to a high-temperature steam medical disinfection cabinet with an air purification circulation mechanism. Background Art

[0002] High-temperature steam sterilization technology has become the mainstream method for sterilizing medical devices due to its high efficiency and environmental protection. The air purification circulation mechanism further ensures the stability of the sterile environment through high-efficiency filtration and circulating air supply. The combination of the two not only improves sterilization efficiency, but also avoids secondary contamination through waste gas treatment and circulating drying functions. It is widely used in key scenarios such as operating rooms, supply rooms and laboratories, providing solid protection for medical safety. However, despite its obvious advantages, the technology still faces challenges.

[0003] In conjunction with the above content, it should be noted that: For example, Chinese patent application number CN2018115774056 discloses a disinfection cabinet with an air purification module and a control method, which integrates the air purification module into the disinfection cabinet. Without affecting the disinfection function of the existing disinfection cabinet, it can not only purify the air inside the disinfection cabinet, but also purify the environment in which the disinfection cabinet is located, thereby enriching the function of the disinfection cabinet;

[0004] In fact, whether it is used in hospitals or homes, there are certain risks in the external installation of air purification modules. Affected by the size of the indoor space and the air flow environment, the role that the air purification module on a single disinfection cabinet can play is limited, and it is easy for the air purification module to be contaminated by dust accumulation in the indoor environment, resulting in a reduction in the high-temperature disinfection effect inside the disinfection cabinet. At the same time, when a disinfection cabinet with a high-temperature disinfection structure is used, the high-temperature gas passes through the external air purification module and causes heat leakage, which not only easily causes indoor safety hazards, but also continuously increases the energy consumption of the disinfection cabinet. Summary of the Invention

[0005] The object of the present invention is to provide a high-temperature steam medical disinfection cabinet with an air purification circulation mechanism to solve the problems raised.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a high-temperature steam medical disinfection cabinet with an air purification circulation mechanism, comprising a disinfection cabinet body, an air treatment box disposed inside the disinfection cabinet body, a main heater disposed on the bottom side of the air treatment box, an electrostatic hanging rod disposed on one side of the air treatment box, a waste box disposed below the electrostatic hanging rod and arranged side by side with the main heater, a high-temperature storage box disposed above the main heater, and an insulation inner cabinet disposed inside the disinfection cabinet body in contact with the air treatment box and the main heater;

[0007] Several groups of steam top boxes are arranged on the inner wall of the top of the thermal insulation inner cabinet, and a steam bottom box is arranged at the bottom of the steam top box. A middle filter rack is sleeved between the steam top box and the steam bottom box, and an exhaust valve is arranged at the center of the middle filter rack. A special-shaped filter element is sleeved on the outer periphery of the exhaust valve. A wastewater collection tank is arranged at the bottom of the thermal insulation inner cabinet, which is slidably sleeved with the bottom of the disinfection cabinet body, and several groups of steam nozzles are arranged on the inner wall of the thermal insulation inner cabinet.

[0008] Furthermore, the air treatment box is provided with a primary air cavity for hanging an electrostatic hanging rod, and a grille is provided on the side of the primary air cavity that penetrates the disinfection cabinet body. A return heat pipe connected to the high-temperature storage box is provided on the other side of the electrostatic hanging rod, and an auxiliary heater connected to the high-temperature storage box is provided on the side of the return heat pipe.

[0009] Furthermore, a middle chamber for installing a reflow heat pipe is provided between the electrostatic hanging rod and the auxiliary heater, a vibrating screen plate and an electric-controlled gate valve connected to the waste box are provided at the bottom of the middle chamber and the primary air cavity, and an air filter element is provided between the middle chamber and the primary air cavity.

[0010] Furthermore, a cross center frame is provided in the center of the inner insulation cabinet, several groups of partitions are provided on the top of both sides of the cross center frame, leakage racks are provided under the partitions, the steam nozzles are arranged on both sides of the partitions and the leakage racks, and a wastewater collection tank and a water collection tank are connected inside the cross center frame.

[0011] Furthermore, several groups of circular holes are set through the top of the steam top box, several groups of extrusion plates are set on the inner top wall of the steam top box, a downward pressure cylinder is set on the top of the extrusion plate and is sleeved in the circular hole, a water collecting groove is set in a depression on the inner bottom wall of the steam bottom box, and an air collecting groove is set in the edge groove of the outer bottom wall of the steam bottom box.

[0012] Furthermore, a flow-guiding rectangular frame which is clamped on the special-shaped filter element is provided on the outer periphery of the inner bottom wall of the middle filter frame, and a flow-guiding annular frame which divides the special-shaped filter element is provided on the outer periphery of the exhaust valve. The flow-guiding rectangular frame and the flow-guiding annular frame form an M-shaped airflow route with the exhaust valve and the frame of the middle filter frame.

[0013] Furthermore, a backflow valve sleeve penetrating the steam top box is provided on the top of the exhaust valve, an upflow groove connected to the special-shaped filter element is provided inside the exhaust valve, an inverted cone-shaped filter rack is provided inside the backflow valve sleeve, and a ring port connected to the upflow groove is provided on the outer inner wall of the top of the exhaust valve.

[0014] The beneficial effects of the present invention are:

[0015] 1. The present invention uses the electrostatic hanging rod ionization zone to charge and adsorb dust, and combines it with the air filter element to form a double filtration to ensure the cleanliness of the air entering the cabinet and prevent dust from contaminating the equipment. The vibration motor drives the electrostatic hanging rod to vibrate at a high frequency, and the air flow flushes to achieve automatic dust shedding. The dust is intercepted and collected into the waste box by the vibrating screen plate, which significantly reduces the frequency of manual maintenance and constitutes efficient air purification and dust control.

[0016] 2. The present invention uses a reflux heat pipe to recover the high-temperature hot steam from the insulated inner cabinet to preheat the pure air, thereby reducing the energy consumption of the main heater. The M-shaped airflow path and guide structure extend the steam residence time, improve the heat and moisture exchange efficiency, ensure that the residual water on the surface of the equipment is completely evaporated, and optimize the heat energy and steam cycle.

[0017] 3. The present invention uses a downward pressure cylinder to squeeze the filter element to discharge retained moisture, and cooperates with the exhaust valve to compress and spray to achieve secondary filtration of water vapor, effectively preventing steam condensation from causing secondary contamination of the equipment. The filter frame intercepts the unfiltered water vapor and guides it to the water collection tank, realizing closed-loop treatment of gas-liquid separation.

[0018] 4. The present invention uses a main heater to quickly heat up, a secondary heater to provide low-power heating to the reflux hot air, and a high-temperature storage box to realize on-demand heat allocation, thereby improving energy utilization. During the disinfection stage, high-temperature steam directly acts on the instrument, and during the preheating stage, hot air is recovered for air heating, forming a thermal cycle ecology; the steam bottom box gas collecting tank and the top box form a three-dimensional circulation, ensuring that all surfaces of the instrument are evenly heated and reducing blind spots in disinfection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0020] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention;

[0021] Figure 2 This is a structural diagram of the disinfection cabinet and the air treatment box of the present invention;

[0022] Figure 3 It is a structural schematic diagram of the gas treatment box of the present invention;

[0023] Figure 4 This is a schematic structural diagram of the thermal insulation inner cabinet of the present invention;

[0024] Figure 5 This is a schematic structural diagram of the steam top box and the middle filter frame of the present invention;

[0025] Figure 6 Schematic diagram of the structure of the steam top box of the present invention;

[0026] Figure 7 Schematic diagram of the structure of the filter support in the present invention;

[0027] Figure 8 It is a structural schematic diagram of the exhaust valve of the present invention.

[0028] Figure numerals: 1. Disinfection cabinet; 2. Insulated inner cabinet; 201. Partition; 202. Leakage rack; 203. Cross center rack; 3. Steam top box; 301. Down-pressure cylinder; 302. Steam bottom box; 303. Water collecting trough; 304. Extrusion plate; 305. Gas collecting trough; 4. Steam nozzle; 5. Wastewater collecting trough; 6. Gas treatment box; 601. High-temperature storage box; 602. Waste box; 603. Auxiliary heater; 604. Return heat pipe; 605. Air filter element; 606. Electrostatic hanging rod; 7. Middle filter rack; 701. Special-shaped filter element; 702. Guide rectangular rack; 703. Guide ring rack; 704. Exhaust valve; 705. Backflow valve sleeve; 706. Upflow trough; 8. Main heater. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Example 1: Please refer to Figure 1 - Figure 8 As shown, this embodiment is a high-temperature steam medical disinfection cabinet with an air purification circulation mechanism, including a disinfection cabinet body 1, an air treatment box 6 is provided inside the disinfection cabinet body 1, a main heater 8 is provided on the bottom side of the air treatment box 6, an electrostatic hanging rod 606 is provided on one side of the air treatment box 6, a waste box 602 is provided below the electrostatic hanging rod 606 and is arranged side by side with the main heater 8, and a high-temperature storage box 601 is provided above the main heater 8;

[0031] An insulated inner cabinet 2 in contact with the gas treatment box 6 and the main heater 8 is provided inside the disinfection cabinet 1. The medical instruments waiting for disinfection are placed on the partition 201 or the leakage rack 202 of the insulated inner cabinet 2. The doors of the insulated inner cabinet 2 and the disinfection cabinet 1 are closed one by one, so that the disinfection cabinet is temporarily closed inside and outside, and the device is started according to the disinfection needs.

[0032] The air treatment box 6 is provided with a primary air cavity for hanging an electrostatic hanging rod 606, and a grille penetrating the disinfection cabinet 1 is provided on the side of the primary air cavity. A return heat pipe 604 connected to the high-temperature storage box 601 is provided on the other side of the electrostatic hanging rod 606, and an auxiliary heater 603 connected to the high-temperature storage box 601 is provided on the side of the return heat pipe 604.

[0033] An air pump is provided inside the main heater 8, and the air pump is connected to the high-temperature storage box 601 and the middle chamber through a regulating valve. When the air pump is connected to the middle chamber through a pipeline, it is used to extract the air inside the primary air chamber. The negative pressure inside the primary air chamber draws the air outside the disinfection cabinet 1 along the grille. When the external air flows along the inside of the primary air chamber, it is adsorbed by the electric field of the ionization zone generated by the electrification of the electrostatic hanging rod 606, which is specifically like the electrostatic dust removal structure, but not limited to this. The dust particles in the air collide with the electrons or ions generated by the ionization, and the adsorbed charges become charged particles, and adhere to the surface of the electrostatic hanging rod 606. The external air passing through the area of ​​the electrostatic hanging rod 606 is then filtered by the air filter element 605 to obtain pure air.

[0034] A middle chamber for installing a return heat pipe 604 is provided between the electrostatic hanging rod 606 and the auxiliary heater 603. The bottom of the middle chamber and the primary air cavity are both provided with a vibrating screen plate and an electrically controlled gate valve connected to the waste box 602. An air filter element 605 is provided between the middle chamber and the primary air cavity. Pure air is poured into the middle chamber and gathered in the middle chamber. The return heat pipe 604 is used to guide the high-temperature hot air recovered from the thermal insulation cabinet 2, and guide it into the return heat pipe 604 for preheating the pure air and then guiding it to the inside of the main heater 8. Accordingly, the heating energy consumption of the main heater 8 for the pure air is reduced.

[0035] A vibration motor is provided on the side of the vibrating screen plate, and the vibration motor is connected to the vibrating screen plate and the bottom of the electrostatic hanging rod 606 through an eccentric shaft for transmission. Accordingly, when no external air extraction is required, the vibration motor drives the electrostatic hanging rod 606 to vibrate, causing the dust particles attached thereto to fall off. The top of the primary air cavity and the inner wall of the electric control gate valve are both provided with exhaust ports connected to the main heater 8 pipeline, which use the excess heat inside the insulation inner cabinet 2 or the high-temperature storage box 601. The heat is discharged outwards to provide pressure inside the primary air cavity, causing the surface of the electrostatic hanging rod 606 to be vibrated and separated from the dust, which flows through the vibrating screen plate under the push of the air flow.

[0036] The exhaust from the electric control valve area is directed outward, guiding the airflow guided by the vibrating screen plate and the primary air cavity to pass through the vibrating screen plate and flow out along the gap opened by the electric control valve, while the dust is intercepted by the vibrating screen plate, and with the cooperation of the continuous vibration of the vibration motor, the dust is intercepted and shaken off into the waste box 602, which is used to keep the indoor environment of the disinfection cabinet 1 continuously clean, and reduce the impact of dust on the disinfection cabinet 1 and medical equipment.

[0037] A cross center frame 203 is provided at the center of the insulation inner cabinet 2, and several groups of partitions 201 are provided on the top of both sides of the cross center frame 203. A leakage rack 202 is provided under the partition 201, and the steam nozzle 4 is arranged on both sides of the partition 201 and the leakage rack 202. The cross center frame 203 is provided with a wastewater collection tank 5 and a water collection tank 303.

[0038] Embodiment 2: This embodiment is a high-temperature steam medical disinfection cabinet with an air purification circulation mechanism, including several groups of steam top boxes 3 arranged on the inner wall of the top of the thermal insulation inner cabinet 2, a steam bottom box 302 arranged at the bottom of the steam top box 3, a middle filter frame 7 is sleeved between the steam top box 3 and the steam bottom box 302, an exhaust valve 704 is arranged at the center of the middle filter frame 7, and a special-shaped filter element 701 is sleeved on the outer periphery of the exhaust valve 704, a wastewater collection tank 5 is provided at the bottom of the thermal insulation inner cabinet 2, which is slidably sleeved with the bottom of the disinfection cabinet body 1, and several groups of steam nozzles 4 are provided on the inner wall of the thermal insulation inner cabinet 2.

[0039] After preheating, the pure air enters the main heater 8, which heats it and then guides it into the steam nozzle 4 through a pipeline. The steam nozzle 4 is used to continuously guide the high-temperature hot air convection to spray toward the medical equipment placed on the partition 201 and the rack 202. As the high-temperature hot air continues to rise, it gathers in the steam bottom box 302 area.

[0040] Several groups of circular holes are set through the top of the steam top box 3, and several groups of extrusion plates 304 are set on the inner top wall of the steam top box 3. A downward pressure cylinder 301 is set on the top of the extrusion plate 304 and is sleeved in the circular hole. A water collecting trough 303 is set in a depression on the inner bottom wall of the steam bottom box 302, and an air collecting trough 305 is set in the edge groove of the outer bottom wall of the steam bottom box 302. The downward pressure cylinder 301 drives the extrusion plate 304 to slide down, and the extrusion plate 304 squeezes the special-shaped filter element 701 from top to bottom, so that the water retained in the special-shaped filter element 701 is squeezed and seeps into the water collecting trough 303. Pipes are set at the corners of the water collecting trough 303 and extend to the cross center frame 203. A through pipe connected to the wastewater collection tank 5 is set inside the cross center frame 203.

[0041] The steam bottom box 302 guides the gathered high-temperature hot air into the steam top box 3 through the air collecting groove 305. This part of the high-temperature steam evaporates the residual water cleaned on the surface of the medical equipment. During the period when the high-temperature hot air flows inward from the outside of the air flow route along the M-line trajectory, the high-temperature hot air flows from bottom to top, and after being blocked by the inner bottom wall of the steam top box 3, it flows to the edge surface of the special-shaped filter element 701, and flows along the gap between the bottom of the guide rectangular frame 702 and the steam bottom box 302. The high-temperature hot air retained in this area is blocked by the guide annular frame 703 and the bottom wall of the steam bottom box 302, which prompts the high-temperature hot air to flow upward. After crossing the guide annular frame 703, it flows downward again to the air inlet near the bottom of the exhaust valve 704, prompting the high-temperature hot air to obtain a curved extended flow trajectory in a small range, so that the moisture inside the high-temperature hot air is fully absorbed by the special-shaped filter element 701.

[0042] A flow-guiding rectangular frame 702 is provided on the outer periphery of the inner bottom wall of the middle filter frame 7, which is clamped on the special-shaped filter element 701. A flow-guiding annular frame 703 is provided on the outer periphery of the exhaust valve 704, which divides the special-shaped filter element 701. The flow-guiding rectangular frame 702 and the flow-guiding annular frame 703, together with the exhaust valve 704 and the frame of the middle filter frame 7, form an M-shaped airflow route.

[0043] During the period when the high-temperature hot gas is guided and transported outward through the exhaust valve 704, it is affected by the internal aperture of the exhaust valve 704, causing the high-temperature hot gas to be compressed and sprayed toward the filter rack, and filtered by the filter rack, intercepting the water vapor that has not been completely filtered out. The gas flows upward along the outer periphery of the filter rack, accompanied by the intermittent exhaust of the gas, causing the water vapor retained on the inner wall of the filter rack to gather and drip into the ring mouth, and then flows along the ring mouth into the water collection tank 303. The top of the exhaust valve 704 is connected to the main heater 8 and multiple exhaust ports through a pipeline.

[0044] A backflow valve sleeve 705 that passes through the steam top box 3 is provided on the top of the exhaust valve 704, and an upflow groove 706 connected to the special-shaped filter element 701 is provided inside the exhaust valve 704. An inverted cone-shaped filter rack is provided inside the backflow valve sleeve 705, and a ring port connected to the upflow groove 706 is provided on the outer inner wall of the top of the exhaust valve 704. The exhaust valve 704 guides part of the high-temperature hot air to flow along the return heat pipe 604. After preheating the pure air, the return heat pipe 604 guides it to the auxiliary heater 603 for low-power heating treatment of the refluxed high-temperature hot air, and stores the excess high-temperature hot air in the high-temperature storage box 601 for timely extraction and allocation of the high-temperature steam disinfection requirements of various areas in the thermal insulation cabinet 2.

[0045] Combining Example 1 and Example 2, it can be seen that efficient air purification is achieved and manual maintenance is reduced by integrating electrostatic adsorption and vibration self-cleaning technology; heat recovery preheating and steam trajectory optimization are used to improve thermal efficiency by about 40%; combined with water vapor compression separation and filter element dehydration design, humidity is precisely controlled; dual heaters cooperate with heat storage modules to allocate thermal energy on demand; intelligent piezoelectric drive and multi-valve linkage ensure disinfection without dead angles; modular layout extends equipment life and improves space utilization, achieving an overall triple breakthrough in energy efficiency optimization, intelligent maintenance, and environmental cleanliness, making it suitable for high-frequency medical device processing scenarios.

[0046] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high-temperature steam medical disinfection cabinet with an air purification circulation mechanism, comprising a disinfection cabinet body (1), characterized in that: An air treatment box (6) is provided inside the disinfection cabinet (1), a main heater (8) is provided on the side of the bottom of the air treatment box (6), an electrostatic hanging rod (606) is provided on one side of the air treatment box (6), a waste box (602) is provided below the electrostatic hanging rod (606) and is arranged side by side with the main heater (8), a high-temperature storage box (601) is provided above the main heater (8), and an insulation inner cabinet (2) is provided inside the disinfection cabinet (1) and is in contact with the air treatment box (6) and the main heater (8); The top inner wall of the thermal insulation inner cabinet (2) is provided with a plurality of steam top boxes (3), the bottom of the steam top box (3) is provided with a steam bottom box (302), a middle filter frame (7) is sleeved between the steam top box (3) and the steam bottom box (302), an exhaust valve (704) is provided at the center of the middle filter frame (7), and a special-shaped filter element (701) is sleeved on the outer periphery of the exhaust valve (704), a wastewater collection tank (5) is provided at the bottom of the thermal insulation inner cabinet (2) and is slidably sleeved with the bottom of the disinfection cabinet body (1), and a plurality of steam nozzles (4) are provided on the inner wall of the thermal insulation inner cabinet (2).

2. The high-temperature steam medical disinfection cabinet with an air purification circulation mechanism according to claim 1, characterized in that: The gas treatment box (6) is provided with a primary air cavity for hanging an electrostatic hanging rod (606), and a grille penetrating the disinfection cabinet (1) is provided on the side of the primary air cavity. A return heat pipe (604) connected to the high-temperature storage box (601) is provided on the other side of the electrostatic hanging rod (606), and a secondary heater (603) connected to the high-temperature storage box (601) is provided on the side of the return heat pipe (604).

3. The high-temperature steam medical disinfection cabinet with an air purification circulation mechanism according to claim 2, characterized in that: A middle chamber for installing a reflux heat pipe (604) is provided between the electrostatic hanging rod (606) and the auxiliary heater (603); a vibrating screen plate and an electrically controlled gate valve connected to a waste box (602) are provided at the bottom of the middle chamber and the primary air cavity; and an air filter element (605) is provided between the middle chamber and the primary air cavity.

4. The high-temperature steam medical disinfection cabinet with an air purification circulation mechanism according to claim 1, characterized in that: A cross center frame (203) is provided at the center of the heat-insulating inner cabinet (2), a plurality of partitions (201) are provided on the tops of both sides of the cross center frame (203), a drain frame (202) is provided below the partitions (201), and the steam spray pipes (4) are arranged on both sides of the partitions (201) and the drain frame (202).

5. The high-temperature steam medical disinfection cabinet with an air purification circulation mechanism according to claim 1, characterized in that: The top of the steam top box (3) is provided with a plurality of groups of circular holes, the inner top wall of the steam top box (3) is provided with a plurality of groups of extrusion plates (304), the top of the extrusion plate (304) is provided with a downward pressure cylinder (301) sleeved in the circular hole, the inner bottom wall of the steam bottom box (302) is provided with a water collecting groove (303) in a depression, and the outer bottom wall edge groove of the steam bottom box (302) is provided with an air collecting groove (305).

6. The high-temperature steam medical disinfection cabinet with an air purification circulation mechanism according to claim 1, characterized in that: The outer periphery of the inner bottom wall of the middle filter frame (7) is provided with a flow guiding rectangular frame (702) clamped on the special-shaped filter element (701); the outer periphery of the exhaust valve (704) is provided with a flow guiding annular frame (703) for dividing the special-shaped filter element (701); the flow guiding rectangular frame (702) and the flow guiding annular frame (703) together with the exhaust valve (704) and the frame of the middle filter frame (7) form an M-shaped airflow route.

7. The high-temperature steam medical disinfection cabinet with an air purification circulation mechanism according to claim 1, characterized in that: The top of the exhaust valve (704) is provided with a backflow valve sleeve (705) that penetrates the steam top box (3); the interior of the exhaust valve (704) is provided with an upflow groove (706) that communicates with the special-shaped filter element (701); the interior of the backflow valve sleeve (705) is provided with an inverted conical filter frame; and a ring opening that communicates with the upflow groove (706) is provided on the outer inner wall of the top of the exhaust valve (704).

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