CN210760416U - Multifunctional livestock and poultry transport vehicle - Google Patents

Abstract

The utility model discloses a multi-functional beasts and birds transport vechicle relates to the transportation equipment field, including the carriage body, carriage body front portion is provided with driver's cabin, carriage body bottom is provided with the wheel, the articulated carriage door that is provided with in carriage body rear portion, be provided with air filter on the carriage body, warm up rising temperature device, deodorizing device, the air intake has been seted up on the carriage body is close to the one end lateral wall of driver's cabin, a plurality of gas vents have been seted up on the carriage body is close to the lateral wall of carriage door, it is provided with back type mounting bracket to correspond the air intake position on the carriage body inner wall, possesses filtration processing, the interior stable advantage of temperature of carriage.

Description

Multifunctional livestock and poultry transport vehicle

Technical Field

The utility model relates to a transportation equipment field especially relates to a multi-functional beasts and birds transport vechicle.

Background

Along with the development of urban and rural economy, the living standard of people is higher and higher, the meat demand is higher and higher, so the transportation volume of livestock and poultry is increased, in order to achieve good ventilation effect, a common livestock and poultry transport vehicle is a cage frame formed by welding iron rods which are arranged in a criss-cross mode, but the cage frame with the structure cannot shield wind and rain for the livestock and poultry in long-distance transportation, and the livestock and poultry are easy to catch cold and even die; in addition, the transport vehicle inevitably has some jolts in the walking process, and the long-time jolt can bring certain influence on the health and mental state of the livestock and poultry; the internal space of the body of a common livestock and poultry transport vehicle is limited, and large livestock, such as cattle, sheep, pigs and the like are easy to be extruded and trampled, and even die. In conclusion, the ordinary livestock and poultry transport vehicle is used for transporting livestock and poultry, which is easy to cause diseases in the midway or casualties caused by crowding and trampling, so that the existing ordinary livestock and poultry transport vehicle cannot meet the special requirements of long-distance transportation of livestock and poultry.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome not enough among the prior art, provide a multi-functional beasts and birds transport vechicle, possess stable temperature's advantage in filtration processing, the carriage.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a multifunctional livestock and poultry transport vehicle comprises a carriage body, wherein a cab is arranged at the front part of the carriage body, wheels are arranged at the bottom of the carriage body, a carriage door is hinged at the rear part of the carriage body, an air filtering device, a floor heating and warming device and a deodorizing device are arranged on the carriage body, an air inlet is formed in the outer side wall of one end, close to the cab, of the carriage body, a plurality of air outlets are formed in the outer side wall, close to the carriage door, of the carriage body, a first mounting frame is arranged on the inner wall of the carriage body, corresponding to the position of,

the air filtering device comprises a fixing frame, a primary filter, a high-efficiency filter and a fan wall, wherein the fixing frame is arranged in the carriage body and close to an air inlet, the primary filter is arranged on a first mounting frame, the high-efficiency filter is arranged on the fixing frame, activated carbon honeycomb filter cotton is embedded in the primary filter, non-woven chemical fiber filter materials are filled in the high-efficiency filter, the fan wall is arranged at the position, corresponding to the air outlet end of a secondary filter, in the carriage, the fan wall is uniformly provided with drainage holes, and a drainage fan is arranged on the fan wall and corresponds to the drainage holes;

the floor heating device comprises a combined type profile frame arranged on a bottom plate of a carriage body, a plurality of cavities are formed in the combined type profile frame, snake-shaped heat conducting pipelines are arranged on the combined type profile frame corresponding to the cavities, pipeline supports used for fixing the heat conducting pipelines are arranged in the cavities corresponding to the snake-shaped heat conducting pipelines, the heat conducting pipelines are connected with a circulating pump and a fuel oil heater, and heat conducting media are filled in the heat conducting pipelines;

deodorizing device includes water tank, atomizer, water pump, the water tank sets up on the carriage body, the water tank intussuseption is filled with the deodorant, the atomizer equipartition sets up on the carriage inner wall and connects gradually water pump, water tank through the pipeline, it is provided with two ripples ultraviolet tube to correspond the air exit position on the carriage body, it is provided with electronic shutter to correspond the gas vent position on the carriage body lateral wall.

In order to further optimize the utility model discloses, can prefer following technical scheme for use:

preferably, the combined type section bar frame comprises a second mounting frame which is spliced with each other, a U-shaped clamping groove is formed in the end face of one side of the second mounting frame, and a protrusion which is matched and inserted with the U-shaped clamping groove is formed in the end face of the other side of the two opposite clamping grooves of the second mounting frame.

Preferably, the second mounting frame is made of aluminum section plates which are spliced with one another, and the heat conduction pipeline is made of PE-RT pipes.

Preferably, the upper end face of the combined section bar frame is uniformly provided with anti-skid convex strips, and the height range of the anti-skid convex strips is 2.5-3 mm.

Preferably, a polyurethane heat-insulation composite plate is arranged on the inner wall of the carriage body.

Preferably, a fan protection cover is arranged on the carriage body corresponding to the exhaust fan, a hook is arranged on the fan protection cover, and the ultraviolet lamp tube is arranged on the hook.

Preferably, it is provided with the accuse wind mechanism that is used for controlling air intake department air volume to correspond the air intake position on the carriage body, accuse wind mechanism includes the deep bead, the deep bead cover is established the air intake position on the carriage body, the deep bead top is provided with the hangers, be provided with the haulage rope on the hangers, correspond the position directly over the deep bead on the carriage body and be provided with the pulley, the haulage rope is walked around the pulley and is connected with the drive handle, the drive handle sets up and is used for controlling the deep bead lift on the carriage body.

Preferably, the bottom of the carriage body is further provided with a standby power supply, a plurality of side ventilation doors for ventilating with the outside are arranged on the outer side wall of the carriage body, and a transparent object viewing window is embedded in one of the side ventilation doors.

Preferably, two interlayer plates are arranged in the carriage body, the inner part of the carriage body is divided into a storage and transportation chamber by the interlayer plates, and one end, close to the side wall of the carriage body, of each interlayer plate is hinged to the carriage body.

Preferably, the first mounting bracket is of a square-shaped structure, the ventilation area in the first mounting bracket gradually decreases along the gas flow direction, the high-efficiency filter comprises a first-stage filter and a second-stage filter which are sequentially connected, the first-stage filter adopts an APP coarse-effect plate type filter, and the second-stage filter adopts a dense-pleated filter.

The beneficial effects of the utility model reside in that:

the utility model discloses an all-aluminum beasts and birds transport vechicle with filtration system, PLC temperature and humidity control system, warm up warming mechanism and deodorizing device, filtration system includes air inlet primary filter and a secondary filter, filtration system adopts primary filter and adds the primary filter and add the secondary filter to constitute, is that the air of air intake to fan air outlet filters through three, progressively filters the evolution and forms clean air, fan PLC temperature and humidity control system has realized effectively that the transport vechicle realizes controlling fan rotational speed fast slow through the temperature in the real-time supervision carriage to the purpose of working in high temperature place can wide application in places such as livestock-raising, beasts and birds transportation, and air filter performance is good, has reached the requirement of country to the industry transportation environment, and commercial value is huge, is worth wide popularization and application. The livestock and poultry transport vehicle is specially designed and produced for places with poor air quality and unsmooth ventilation in the livestock and poultry transport process, and can be safely applied to transport operation in places with potential dirty gas, high temperature and severe cold, such as the animal husbandry, the transport industry and the like.

Drawings

FIG. 1 is a schematic view of the overall structure of a livestock and poultry transporter in embodiment 1;

FIG. 2 is a schematic view of the overall structure of the car body;

FIG. 3 is a side view of the interior structure of the vehicle compartment;

FIG. 4 is a top view of the floor heating device;

fig. 5 is a side view of the floor heating device;

FIG. 6 is an enlarged view of the structure at A;

FIG. 7 is a top view of the interior structure of the passenger compartment;

FIG. 8 is a schematic view of the overall structure of the air filter device;

FIG. 9 is a schematic view of the overall structure of the wind control mechanism;

FIG. 10 is a schematic view of a fan mounting plate configuration;

FIG. 11 is a schematic view of a fan;

FIG. 12 is an enlarged view of the structure at B;

wherein: 1-carriage body, 2-cab, 3-carriage door, 4-air filtering device, 5-exhaust port, 6-electric shutter, 7-standby power supply, 8-fuel heater, 9-mounting rack II, 10-anti-skid convex strip, 11-pipeline support, 12-heat conducting medium, 13-heat conducting pipeline, 14-U-shaped clamping groove, 15-convex strip, 16-L-shaped angle iron, 17-storage and transportation chamber, 18-drainage fan, 19-interlayer plate, 20-supporting plate, 21-hinge pin shaft, 22-pipeline, 23-atomizing nozzle, 24-water tank, 25-solid deodorant, 27-fixing clamp, 28-side ventilating door, 29-object viewing window, 30-top ventilating door, 31-ventilating window, 32-transparent window, 101-fixing frame, 102-mounting frame I, 103-primary filter, 104-front compartment plate, 105-air control mechanism, 106-primary filter, 107-secondary filter, 108-air inlet, 109-air baffle, 110-steering pulley, 111-ear, 112-traction rope, 113-rotating handle, 114-fan wall, 115-drainage hole, 116-draught fan mounting frame, 117-polyurethane cotton heat-insulating composite plate, 118-fan protective cover, 119-exhaust fan, 120-hook, 121-ultraviolet lamp tube, 122-fan mounting groove and 123-fixing screw.

Detailed Description

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1

As shown in fig. 1-12, a multi-functional beasts and birds transport vechicle, including carriage body 1, carriage body forward portion installs driver's cabin 2, carriage body installs the wheel bottom, carriage body rear portion articulates installs the railway carriage or compartment door 3, carriage body installs two interlayer boards in, the interlayer board separates into upper, middle, lower three warehousing and transportation room 17 with carriage body inside, enlarge the bearing volume of carriage body through interlayer board 19 and improve the warehousing and transportation volume, install on carriage body through articulated round pin axle 21 near carriage body lateral wall department one end in the interlayer board intermediate position, guarantee that the interlayer board can realize the upset function, and then be convenient for the staff and clear up and maintain, in order to guarantee the structural strength of interlayer board, install backup pad 20 corresponding to the position under the interlayer board on carriage body, support the interlayer board through the backup pad. Install the top ventilation door 30 that is used for the ventilation at the top of carriage body, install three 1800mm, the side ventilation door 28 of width 700mm on the lateral wall about the carriage body respectively, wherein 5 are the entity door, have one above install the thing window 29 of looking of transparent acrylic plate seat, the condition in the carriage is observed for the road administration personnel under the condition of contactless carriage body to the thing window 29 that looks, reduce the epidemic propagation of germ, through top ventilation door 30 and side ventilation door, can guarantee to realize quick ventilation function under the emergency. Install air filter 4 on the carriage body, warm up rising temperature device, deodorizing device, seted up air intake 108 on the carriage body is close to the one end lateral wall of driver's cabin, seted up a plurality of gas vents 5 on the carriage body is close to the lateral wall of railway carriage or compartment door, correspond air intake 108 position on the carriage body inner wall and install back type mounting bracket 102, mounting bracket one is back the type, and draught area diminishes gradually along the gas flow direction in the mounting bracket one.

The air filtering device 4 comprises a fixing frame, a primary filter, a secondary filter and a fan wall 114, the fixing frame 101 is installed in the carriage body and close to an air inlet, the primary filter is installed on a first square-shaped mounting frame 102, the primary filter and the secondary filter are sequentially installed on the fixing frame 101 along the air flowing direction, activated carbon honeycomb filter cotton is embedded in the primary filter 103, the air filtering device has the functions of large dust holding capacity, good adsorption performance, large air permeability and convenience in disassembly, and non-woven chemical fiber filter materials are filled in the primary filter 106 and the secondary filter 107; the primary filter adopts an APP coarse-effect plate filter, has a reliable structure, is convenient for washing and replacing filter materials, and the secondary filter adopts a dense-pleat filter, has large effective filter area, low resistance, long service life, environment-friendly integral structure and good dustproof filter effect; meanwhile, the fixing frame adopts a KF type filter mounting frame, the KF type filter mounting frame is simple in unit structure and strong in universality, and a multi-layer air filtering system is adopted to ensure that air outside a carriage is filtered by the filtering system when entering the carriage, so that some particulate pollutants are prevented from entering the carriage, meanwhile, the air entering the carriage of the transport vehicle is clean air according to the principle of layer-by-layer filtering, a fan wall 114 is arranged at the position, corresponding to the air outlet end of a secondary filter, in the carriage body, drainage holes 115 are uniformly distributed on the fan wall, a drainage fan 18 is arranged on the fan wall 114 corresponding to the drainage hole, an induced fan mounting frame 116 is arranged on the fan wall corresponding to the drainage fan position; in addition correspond the front carriage board 104 of air intake position on the carriage body and install the accuse wind mechanism 105 that is used for controlling air intake department air volume, accuse wind mechanism includes deep bead 109, the deep bead cover is established the air intake position on the carriage body, hangers 111 is installed at the deep bead top, install the haulage rope on the hangers 111, correspond the position directly over the deep bead on the carriage body and install deflector pulley 110, haulage rope 112 is walked around deflector pulley 110 and is connected with rotatory handle, rotatory handle 113 is installed and is used for controlling the deep bead and go up and down on the carriage body, can realize the effect of inlet channel on-off control through accuse wind mechanism, and then guarantee the inside leakproofness in whole carriage, waterproof nature.

The floor heating device comprises a combined type section bar frame arranged on a bottom plate of a carriage body, a plurality of cavities are arranged on the combined type section bar frame, anti-skid convex strips are uniformly arranged on the upper end face of the combined type section bar frame, the height range of the anti-skid convex strips 10 is 2.5mm, the stability of the whole structure is improved through the anti-skid convex strips 10, snake-shaped heat conducting pipelines are arranged on the combined type section bar frame corresponding to the cavities, the combined type section bar frame comprises two mutually-spliced mounting frames 9, the two mounting frames 9 are made of mutually-spliced aluminum section bar plates, the whole strength can be guaranteed on the basis of reducing the whole weight, U-shaped clamping grooves are arranged on the end face of one side of the two mounting frames 9, convex strips 15 matched and inserted with the U-shaped clamping grooves 14 are arranged on the end face of the other side of the two mounting frames; the bottom of the mounting frame is provided with an L-shaped angle iron 16 which is fixed at the bottom of the carriage body through the L-shaped angle iron 16; the pipeline support that is used for fixed heat conduction pipeline is installed to the snake type heat conduction pipeline position in the cavity, and heat conduction pipeline is connected with circulating pump, fuel oil heater 8, and heat conduction medium 12 is filled in heat conduction pipeline 13 intussuseption, and after fuel oil heater 8 led to 24VDC electricity, motor one end drove combustion-supporting fan high-speed rotatory, and the other end drove high-pressure oil pump and makes the fuel oil circulate in the oil circuit. The electromagnetic valve is opened, the high-pressure oil mist sprayed by the oil nozzle and the combustion-supporting air are fully mixed and then are ignited by the high-pressure electrode, and the heat generated by combustion is transferred to the circulating liquid in the heat exchanger through the cooling fins. The heated circulating liquid is sent to a heat dissipation device PE-RT heat conduction pipeline in the automobile under the action of a water pump, and the heat is transferred to the aluminum profile through the PE-RT heat conduction pipeline and then is transferred to the environment in the carriage and livestock and poultry. The temperature of a liquid outlet of the fuel oil heater 8 can reach 60-70 ℃, heat is transferred through the heat conducting pipeline and the aluminum profile, and the average temperature of the earth surface in the carriage can reach 23-30 ℃; the ground heating heat conduction pipelines are arranged in a shape of a Chinese character 'hui', the heat conduction pipelines are arranged in an aluminum section plate at intervals of 100mm, the heat conduction pipelines and the aluminum section are fixed by adopting heat conduction pipeline brackets 11, and the heat conduction pipeline brackets 11 are spot-welded at two ends of the aluminum section; the heat conduction and heat conduction pipeline adopts a PE-RT pipe, so that the transmission effect can be ensured; the polyurethane cotton heat-insulation composite plate 117 is arranged on the inner wall of the carriage body, and the polyurethane cotton heat-insulation composite plate can prevent excessive heat dissipation in the carriage; when the fuel oil heater 8 heats the heat-conducting medium to a specified temperature, liquid is transmitted into the heat-conducting pipeline by a pump and circulates in the heat-conducting pipeline, the heat-conducting pipeline transmits heat to the surface of the aluminum profile with the edges, as is well known, the heat transfer coefficient of the aluminum is 10W/square meter K, the heat power of the fuel oil heater 8 is 35Kw., and the area of one layer of storage and transportation room of a carriage is about 20 square meters (the length is 8.3 meters, and the width is 2.5 meters), and the aluminum profile and the support adopting the shape have the advantages that: the temperature rise speed in the carriage is high, the temperature loss of liquid in the heat conduction pipeline is small, and the temperature rise in the carriage can be easily used to reach the specified temperature. The design mainly solves the problems that the temperature of live poultry in a carriage is low in winter and the live poultry are easy to be frozen in the transportation process, and the traditional air heater, the liquid fin type heater, the fan heater and the like are difficult to reach the temperature suitable for the livestock and poultry.

The deodorizing device comprises a water tank 24, atomizing nozzles, a water pump and an exhaust fan, wherein the water tank is arranged on a carriage body, a deodorant is filled in the water tank, the atomizing nozzles 23 are uniformly arranged on the inner wall of the carriage and are connected with the water tank through a pipeline 22, the exhaust fan 119 is arranged on a fan mounting groove 122 corresponding to the exhaust port 55 on the carriage body, in order to ensure the stability of the position of the exhaust fan, the deodorizing device is arranged in the fan mounting groove 122 in a mode of adopting a fixing screw 123, a fan protection cover 118 is arranged on the carriage body corresponding to the exhaust fan, an ultraviolet lamp tube is arranged on the carriage body corresponding to the position of the air inlet of the exhaust fan, a hook 120 is arranged on the fan protection cover, the ultraviolet lamp tube is arranged on the hook 120, a double-wave ultraviolet lamp tube (40W of each window) is, the lamp tube and the fan are controlled in a linkage way and are started and stopped simultaneously; correspond 5 positions in the gas vent on the carriage body lateral wall and install electronic shutter 6, through add 1 in water tank 24: 500 plant type deodorization germicide, through the atomizer blowout, utilize it to adsorb and react the foul smell molecule to at gas vent 5 through fixation clamp 27 installation solid deodorant 25, react the foul smell molecule in the exhaust gas, make the gas that changes the pig car combustion gas clean pollution-free, do not spread foul smell and germ, install two ripples ultraviolet tube in carriage left side board right side board fan exit, drive the air discharge car of disinfecting with ultraviolet tube 121 through the fan. A standby power supply 7 is further installed at the bottom of the carriage body, all parts in the carriage body are powered through the standby power supply 7, the power supply can be switched when the carriage body stops working, and therefore the stability of the inside of the whole carriage body is guaranteed.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims (10)

1. The utility model provides a multi-functional beasts and birds transport vechicle, includes the carriage body, and carriage body front portion is provided with the driver's cabin, carriage body bottom is provided with the wheel, the articulated railway carriage or compartment door that is provided with in carriage body rear portion, its characterized in that: the carriage body is provided with an air filtering device, a floor heating device and a deodorizing device, the outer side wall of one end of the carriage body, which is close to the cab, is provided with an air inlet, the outer side wall of the carriage body, which is close to the carriage door, is provided with a plurality of air outlets, the inner wall of the carriage body is provided with a first mounting frame corresponding to the position of the air inlet,

the air filtering device comprises a fixing frame, a primary filter, a high-efficiency filter and a fan wall, wherein the fixing frame is arranged in the carriage body and close to an air inlet, the primary filter is arranged on a first mounting frame, the high-efficiency filter is arranged on the fixing frame, activated carbon honeycomb filter cotton is embedded in the primary filter, non-woven chemical fiber filter materials are filled in the high-efficiency filter, the fan wall is arranged at the position, corresponding to the air outlet end of a secondary filter, in the carriage, the fan wall is uniformly provided with drainage holes, and a drainage fan is arranged on the fan wall and corresponds to the drainage holes;

the floor heating device comprises a combined type profile frame arranged on a bottom plate of a carriage body, a plurality of cavities are formed in the combined type profile frame, snake-shaped heat conducting pipelines are arranged on the combined type profile frame corresponding to the cavities, pipeline supports used for fixing the heat conducting pipelines are arranged in the cavities corresponding to the snake-shaped heat conducting pipelines, the heat conducting pipelines are connected with a circulating pump and a fuel oil heater, and heat conducting media are filled in the heat conducting pipelines;

deodorizing device includes water tank, atomizer, water pump, the water tank sets up on the carriage body, the water tank intussuseption is filled with the deodorant, the atomizer equipartition sets up on the carriage inner wall and connects gradually water pump, water tank through the pipeline, it is provided with two ripples ultraviolet tube to correspond the air exit position on the carriage body, it is provided with electronic shutter to correspond the gas vent position on the carriage body lateral wall.

2. The multifunctional livestock and poultry transport vehicle according to claim 1, characterized in that: the combined type section bar frame comprises a second mounting frame which is spliced with each other, a U-shaped clamping groove is formed in the end face of one side of the mounting frame, and a protrusion which is matched with the U-shaped clamping groove in a plug-in mounting mode is arranged on the end face of the other side of the opposite clamping groove of the mounting frame.

3. The multifunctional livestock and poultry transport vehicle according to claim 2, characterized in that: the second mounting rack is made of aluminum section plates which are spliced with one another, and the heat conducting pipeline is made of PE-RT pipes.

4. The multifunctional livestock and poultry transport vehicle according to claim 1, characterized in that: the combined type section bar frame is characterized in that anti-skid convex strips are uniformly distributed on the upper end face of the combined type section bar frame, and the height range of the anti-skid convex strips is 2.5-3 mm.

5. The multifunctional livestock and poultry transport vehicle according to claim 1, characterized in that: and a polyurethane heat-insulation composite plate is arranged on the inner wall of the carriage body.

6. The multifunctional livestock and poultry transport vehicle according to claim 1, characterized in that: a fan protection cover is arranged on the carriage body corresponding to the position of the exhaust fan, a hook is arranged on the fan protection cover, and the double-wave ultraviolet lamp tube is arranged on the hook.

7. The multifunctional livestock and poultry transport vehicle according to claim 1, characterized in that: the wind control mechanism who is used for controlling air intake department air volume is provided with corresponding air intake position on the carriage body, wind control mechanism includes the deep bead, the deep bead covers establishes the air intake position on the carriage body, the deep bead top is provided with the hangers, be provided with the haulage rope on the hangers, correspond the position directly over the deep bead on the carriage body and be provided with the pulley, the haulage rope is walked around the pulley and is connected with the drive handle, the drive handle sets up and is used for controlling the deep bead on the carriage body and go up and down.

8. The multifunctional livestock and poultry transport vehicle according to claim 1, characterized in that: the emergency power supply is further arranged at the bottom of the carriage body, a plurality of side ventilation doors used for ventilating with the outside are arranged on the outer side wall of the carriage body, and a transparent object viewing window is embedded in one of the side ventilation doors.

9. The multifunctional livestock and poultry transport vehicle according to claim 1, characterized in that: the compartment body is internally provided with two interlayer plates, the interior of the compartment body is divided into storage and transportation chambers by the interlayer plates, and one end of each interlayer plate, which is close to the side wall of the compartment body, is hinged to the compartment body.

10. The multifunctional livestock and poultry transport vehicle according to claim 1, characterized in that: the first type that is back of mounting bracket, ventilation area steadilys decrease along the gas flow direction gradually in the mounting bracket, high efficiency filter is including consecutive primary filter, secondary filter, the primary filter adopts the thick board-like filter of APP, secondary filter adopts close pleat formula filter.

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