KR20220095980A - Filter showerhead having sterilization function - Google Patents

Abstract

The present invention relates to a filter shower having a sterilization function, which can perform antibacterial and sterilization treatment by completely removing various foreign substances or germs from water used in a shower in a bathroom or a sink in a kitchen, etc. The present invention provides the filter shower having a new type of sterilization function, which can semi-permanently and automatically sterilize various harmful bacteria propagating in a wet shower and a shower filter after taking a shower, and also can supply beneficial water to a human body by blocking formation of organic chlorine chemicals in water and generating magnetized hexagonal water containing strong magnetic energy to give elasticity to a scalp and skin. The filter shower includes a shower body, a filter assembly, a primary antibacterial and sterilization unit, and a secondary antibacterial and sterilization unit.

Description

Filter showerhead having sterilization function

The present invention relates to a filter shower having a sterilization function, and more particularly, to a filter shower having a sterilization function that completely removes and anti-sterilizes various foreign substances or bacteria in water used in a shower in a bathroom or a sink in a kitchen, etc. it's about

In general, due to water pollution caused by industrial development, instead of using tap water directly at home or work as drinking water, add barley, corn, omija, kale, peony, and goji to boil and then cool it to use it as drinking water or use a separate water purifier. Therefore, purified water is being used as drinking water.

As the environmental pollution becomes more serious, it is a recent trend to use purified water using a separate water purifier as drinking water instead of directly using tap water for drinking at home or at work.

Usually, a water purifier is a device that removes foreign substances contained in raw water by passing tap water supplied from a water faucet, that is, raw water through a separate filtration means, and has recently been widely used in entertainment establishments as well as households.

Such a water purifier is a general water purifier that has only a simple water purifying function that filters various impurities, bacteria, and heavy metals contained in the raw water by allowing the raw water to pass through several stages of filtration filters in turn, and a cooling device and heating device for the functions of a general water purifier. It can be divided into cold/hot water purifiers that provide cold water and hot water by adding and purifying raw water and then cooling or heating it immediately.

In general, households using a water purifier are installed in the kitchen, which is a location where raw water can be supplied, and it is particularly common to install the water purifier above or inside the sink.

Since such a sink is manufactured according to the size and shape of the kitchen and there is no separate space for installing the water purifier, there is a disadvantage in that some space of the sink cannot be used when the water purifier is installed and used.

As the level of hygiene and awareness of consumers has recently increased, products related to antibacterial and sterilization in daily necessities are establishing themselves as necessities in the era of Corona.

In addition, the biggest problem of filter showers as well as general showers is that after showering, the inside of the shower and the filter are always wet with moisture and the temperature is moderate, so more bacteria are detected than in the toilet.

In particular, the filter shower has a problem that, after rust, floating matter, and harmful substances in tap water are filtered through the filter, they become food and nutrients for bacteria and become a breeding ground for various bacteria.

In order to solve this problem, shower heads in the past have used sterilization methods using silver foam, silver nano balls, or antibacterial balls. It is true that silver powder or particles, which are heavy metals, may come off and become lodged in body cells when swallowed by infants or children while bathing or brushing teeth, and there is a risk of cellular mutation after several years.

Korean Patent Registration No. 10-1719522 Korean Patent Publication No. 10-2004-0080962 Korean Patent Publication No. 10-2004-0105186 Korea Registered Utility Model No. 20-0293011 Korea Registered Utility Model No. 20-0310203

Therefore, it is an object of the present invention to semi-permanently automatically sterilize various harmful bacteria propagating in the shower filter and inside the shower wet after showering, as well as blocking the generation of organic chlorine chemicals in water and providing strong magnetic energy. To provide a filter shower with a new type of sterilization function that can supply beneficial water to the human body, such as generating magnetic hexagonal water containing

In order to achieve the above object, the filter shower having a sterilization function provided by the present invention has the following characteristics.

The filter shower having the sterilization function includes a shower body configured in an assembly form of a shower head having a water outlet at the top front for discharging water and a shower body having a water inlet at the bottom for water inlet, and the shower body is located inside the shower body. A cylindrical filter assembly that is connected to the shower head inlet of the shower head through the upper center while inducing a flow of water from the outer periphery toward the center to remove impurities in water, and is installed on the water inlet side of the shower body A magnetic ball freely flowing by the flow rate, a housing accommodating the magnetic ball, a primary anti-sterilization unit comprising a metal ring installed around the inner wall of the shower body and contacting the magnetic ball, and the shower head of the shower head A magnet ball installed at the inlet of the part and freely flowing by the flow rate of water, a housing for accommodating the magnet ball, and a secondary anti-sterilization part composed of a metal ring that is installed around the inner wall of the housing and comes into contact with the magnet ball characteristic.

In particular, the housing of the primary anti-sterilization unit has a circular cap shape with an open lower portion, and the opening and closing hole and the opening and closing hole located in the center while having a relatively small diameter compared to the diameter of the magnet ball on the upper plate of the housing A plurality of water discharge holes are formed along the periphery of the housing, and the upper plate of the housing has a plurality of legs radially disposed on the bottom surface and is in contact with each leg of the lower cap coupled to the lower end of the filter assembly. There is also a feature that can guide the water exiting the housing to the area between the outer periphery of the filter assembly and the inner wall of the shower body.

Here, the metal ring of the primary anti-sterilization unit and the secondary anti-sterilization unit may be made of a material such as gold, silver, brass, copper, zinc, aluminum, stainless steel, titanium, or the like.

In addition, the filter shower having the sterilization function is composed of a cylindrical filter box that can be opened and closed while having a plurality of holes on the front and back at positions adjacent to the water outlet in the shower head, and a nonwoven filter built into the filter box. It may further include an auxiliary filter unit.

The filter shower having a sterilizing function provided by the present invention has the following effects.

First, there is an effect of semi-permanent and fully automatic anti-bacterial action without chemicals due to the generation of metal ions and electromagnetism by a special rotating magnetic ball rotating by the flow rate and a brass ring with excellent electrical conductivity.

Second, by forming a strong magnetic field, it blocks the chemical bonding of organic matter and residual chlorine in water to block the generation of organic chlorine chemicals that are harmful to the human body, and generates strong magnetic hexagonal water to give elasticity to the scalp and skin and reduce shower time there is

Third, the inside of the shower and the shower filter, which are always wet with just one shower, are not disinfected in the sun every day, do not use any chemicals, and are automatically rotated by the flow rate of water pressure by a ring made of materials such as brass and copper. As an eco-friendly sterilization product that automatically sterilizes microorganisms due to the generation of electromagnetic fields, it is effective in reducing the sterilization reduction rate of 99.9% of harmful bacteria such as pneumococcus, Pseudomonas aeruginosa, Escherichia coli, and Staphylococcus aureus.

Fourth, many of the water pipes connected to homes in Korea are older than 20 years, and they have the effect of protecting sensitive skin from foreign substances in tap water, harmful bacteria invisible, residual chlorine, and all heavy metals including iron.

Fifth, because children can swallow water in the shower, using a disinfectant humidifier as a mirror, through years of research and experiments, it generates an electric/magnetic field with strong sterilization function that can be used semi-permanently inside the filter without using any artificial chemicals. After showering, it automatically sterilizes the inside and filter of the shower that is always wet, blocks the generation of organic chlorine chemicals, and generates magnetic hexagonal water containing powerful magnetic energy to give elasticity to the scalp and skin. effect that can be obtained.

Sixth, since it does not use any artificial chemical materials such as chlorine removal balls, vitamin gels, and aroma fragrances that have been used in general showers, children and the elderly as well as those who are sensitive to odors and foreign substances can use it with confidence. It is simple and convenient to use in the sink, and every moment you turn on water, an electric and magnetic field is generated by a rotating magnet and a brass ring to neutralize residual chlorine and sterilize harmful bacteria. effect that can be provided.

1 to 4 are a perspective view and a cross-sectional view showing a filter shower having a sterilization function according to an embodiment of the present invention;
5 is a cross-sectional view showing a use state of a filter shower having a sterilization function according to an embodiment of the present invention;

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 to 4 are a perspective view and a cross-sectional view showing a filter shower having a sterilization function according to an embodiment of the present invention.

As shown in FIGS. 1 to 4 , the filter shower having a sterilization function includes a shower body 14 configured in an assembly form of a shower head 11 and a shower body 13 .

The shower head 11 of the shower body 14 is a part that discharges cleanly purified and sterilized water (eg, purified and sterilized water from tap water). It is formed in the shape of an approximately “L” with a space penetrating through it.

The shower body part 13 of the shower body 14 is a part for introducing water, and has a hollow cylindrical shape.

The shower head unit 11 and the shower body unit 13 can be assembled in a structure that can be disassembled and coupled to each other by a screw fastening structure.

And, on one side of the inside of the shower head 11, for example, at the boundary between the front part and the lower part, on the inside one side of the lower part, the shower head part inlet 15 serving as a passage for communicating water coming up from the bottom to the front ) is formed, and the secondary anti-sterilization unit 21 can be installed at the shower head inlet 15 thus formed.

In particular, the water outlet 10 serving to finally discharge water is mounted on the front of the upper end of the shower head 11, that is, on the front of the front of the shower head, and the lower end of the shower body 13 is equipped with water. The water inlet 12 in the form of a screw tube that serves to introduce It is converted into water in the made state and can be discharged through the water outlet 10 .

Here, the water outlet 10 is composed of a water outlet plate 30 for spraying water, a silicone ring 31 for airtight maintenance, and a head cap 32 as a finishing member.

The water outlet plate 30 is in the form of a thin disk made of a stainless steel material, and the water outlet plate 30 has a number of holes formed over the entire area, and is located inside the back surface of the head cap 32 and the head cap It is installed in a structure to be seated on the locking jaws 33 formed along the inner circumferential circumference.

The silicone ring 31 is installed inside the head cap 32 in a structure interposed between the back surface of the water outlet plate 30 and the front surface of the filter box 27 of the auxiliary filter unit 29, and the silicone ring installed in this way The ring 31 serves to prevent water from leaking into the screw fastening portion of the head cap 32 fastened to the shower head unit 11 .

And, the head cap 32 is installed in a structure that is fastened to the screw portion formed on the outer circumferential surface of the front portion of the shower head 11 using the screw portion of the inner circumferential surface. As the 32 is fastened, the water outlet plate 30 and the silicone ring 31 as well as the auxiliary filter unit 29 on the back side thereof do not fall out of the shower head unit 11 .

At this time, the shower body 14 composed of the assembled form of the shower head 11 and the shower body 13 uses the water inlet 12 formed in the shower body 13 to the shower side of the bathroom. It can be connected and installed on the side of the sink faucet to which the pipe or water pipe is connected.

At this time, the shower head 11 and the shower body 13 of the shower body 14 are preferably made of a material such as polycarbonate that is harmless to the human body and takes safety and durability into consideration.

In addition, the filter shower having a sterilization function includes an auxiliary filter unit 29 as a means for removing impurities, foreign substances, and the like in water.

The auxiliary filter unit 29 is composed of a cylindrical filter box 27 having a plurality of holes 26 on the front and rear surfaces, which can be opened and closed, and a nonwoven filter 28 built into the filter box 27 .

The nonwoven fabric filter 28 is formed in a circular block shape in which a thin circular nonwoven fabric is laminated and bonded in multiple layers, and is disposed inside the filter box 27 to filter impurities or foreign substances contained in water. will play a role

The filter box 27 is composed of a box body 27a in the shape of a circular case having a hole in the front, and a box cap 27b in the shape of a circle closing the front open portion of the box body 27a.

At this time, a plurality of holes 26 for the passage of water are formed in the box body 27a and the box cap 27b, and thus the box body 27a is passed through the holes 26 formed in the box body 27a. ), after passing through the non-woven fabric filter 28, the water can escape out of the box body 27a through the hole 26 formed in the box cap 27b.

In particular, the box body 27a and the box cap 27b of the filter box 27 are assembled in a structure that can be separated and coupled to each other, and at this time, the box body 27a and the box cap 27b are screwed together. A coupling structure, a coupling structure using grooves and protrusions, etc. can be assembled into a structure that can be separated and combined.

Accordingly, when the head cap 32 including the silicone ring 31 is separated from the shower head 11 and the water outlet plate 30 is removed, the filter box 27 of the auxiliary filter unit 29 is removed. Since it can be easily removed and the box body 27a and the box cap 27b can be opened continuously, the nonwoven fabric filter 15 can be easily replaced.

The filter box 27 accommodating the nonwoven fabric filter 28 is disposed in front of the inside of the shower head 11 and the outer circumferential surface of the filter box 17 is in close contact with the inner wall of the shower head 11, In this state, since the filter box 27 is fixed by the close contact of the water outlet plate 30 in the front and the fastening of the head cap 32 , the auxiliary filter unit 29 is stably placed in front of the inside of the shower head unit 11 . can be installed.

In addition, the filter shower having a sterilization function includes a filter assembly 16 as a means of removing impurities as well as harmful components in water.

The filter assembly 16 is in the form of a hollow cylindrical tube, and is manufactured in the form of a cylindrical tube by coating or applying carbon particles to a cotton material, or a compressed fiber material through which water can pass, or compressed paper. It consists of a filter body 34 made of a material, non-woven material, etc. in the form of a cylindrical tube shape, and an upper cap 35 and a lower cap 25 coupled to the upper and lower ends of the filter body 34 . do.

At this time, the upper cap 35 has a hole in the center, and the water inside the filter body 34 escapes upward and is sent to the shower head 11 side, and the lower cap 25 . As a closed shape, it serves to prevent the water entering the water inlet 12 of the shower body 13 from directly entering the inside of the filter body 34 .

In addition, a plurality of legs 24 that are radially arranged and spaced apart from each other are formed protruding from the lower surface of the lower cap 25, and thus the lower cap 25 is coupled to the lower end of the filter assembly 16. Since each leg 24 of the primary anti-sterilization unit 20 comes into contact with the upper surface of the housing 18a, the water flowing out of the housing 18a is guided between the respective legs 24. It is allowed to flow into the area between the outer perimeter of the filter assembly 16 and the inner wall of the shower body 13 .

Such a filter assembly 16 is disposed in the shower body 13 to form a coaxial structure, and in this state, the secondary anti-sterilization unit 21 through the upper cap 35 and the lower cap 25 It can be installed in a structure that is sandwiched between the lower surface of the housing 18b and the upper surface of the housing 18a of the primary antibacterial/sterilizing unit 20 to be supported.

Therefore, the water flows into the inside of the filter body 34 after passing through the filter body 34 on the outer periphery of the filter body 34 of the filter assembly 16, and the water thus introduced is continuously discharged from the upper side. Through the hole in the upper cap 35, the water can be sent to the secondary anti-sterilization unit 21 installed on the shower head inlet 15 side of the shower head 11, and in this way, the water is filtered through the filter body. While passing through (34), harmful components and impurities in the water can be removed.

In addition, the filter shower having the sterilization function generates a strong electric and magnetic field through a combination of a rotating magnet and metal, for example brass or copper, to sterilize various bacteria, and also uses a strong magnetic field to remove organic matter and residue in water A primary anti-sterilization unit (20) and a secondary anti-sterilization unit (21) as a means to block the chemical bonding of chlorine and to block the generation of organic chlorine chemicals harmful to the human body and to generate magnetized hexagonal water containing strong magnetic energy includes

The primary anti-sterilization part 20 is installed on the water inlet 12 side of the shower body part 13, and a magnet ball 17a freely flowing by the flow rate of water, a housing accommodating the magnet ball 17a (18a), a metal ring (19a) which is installed around the inner wall of the shower body part (13) and comes into contact with the magnet ball (17a).

Here, the housing 18a of the primary anti-sterilization unit 20 has a circular cap shape with an open lower portion, and the upper plate of the housing 18a has a relative diameter compared to the diameter of the magnet ball 17a. The opening/closing hole 22 located in the center while having a small diameter and a plurality of water discharge holes 23 located at the outer portion along the periphery of the opening/closing hole 22, for example, 4 arranged at intervals of 90° The water discharge holes 23 are formed.

The upper plate of the housing 18a of the primary anti-sterilization unit 20 comes into contact with each leg 24 of the lower cap 25 coupled to the lower end of the filter assembly 16, and accordingly, the housing 18a The water that has escaped can be led to a region between the outer periphery of the filter assembly 16 and the inner wall of the shower body 13 .

In addition, the metal ring 19a may be made of a material such as gold, silver, brass, copper, zinc, aluminum, stainless, titanium, or the like, and the metal ring 19a is located inside the shower body adjacent to the water inlet 12 . It is installed in a structure that is fitted to the wall of the shower body at the lower end, and the magnetic ball 17a can be positioned in the inner region of the metal ring 19a installed in this way.

The housing 18a can be stacked in a coaxial structure directly above the metal ring 19a installed in this way.

Accordingly, the magnetic ball 17a can flow while intermittently colliding with the metal ring 19a at this time in the space surrounded by the metal ring 19a by the flow rate of water, and the operation of the magnetic ball 17a Due to the characteristics and material characteristics of the metal ring 19a, strong magnetic energy for generating magnetic hexagonal water as well as the electromagnetic fields necessary for sterilization of various harmful bacteria can be generated.

In addition, in the case of the magnetic ball (17a), in a state in which water is continuously supplied, it continuously flows and makes a rattling sound, and as the user can visually see the movement of the magnetic ball (17a), It is possible to provide a visual effect as well as an auditory effect to the user.

The secondary anti-sterilization unit 21 is installed at the shower head inlet 15 of the shower head 11 to accommodate the magnetic ball 17b and the magnetic ball 17b that freely flow by the flow rate of water. The housing 18b includes a metal ring 19b installed around the inner wall of the housing 18b and in contact with the magnet ball 17b.

The housing 18b has an open upper end and a lower end is closed except for the opening and closing hole 22 at the center, for example, the opening and closing hole 22 having a relatively small diameter compared to the diameter of the magnet ball 17b. In the form of a cap, it is installed in a structure coupled to the lower end of the shower head inlet 15 of the shower head 14 .

At this time, the opening/closing hole 22 of the housing 18b communicates with the inside of the filter assembly 16 , that is, the inside of the filter body 34 , and accordingly, the water flowing out of the filter body 34 is immediately transferred to the housing. It is possible to enter the interior of (18b).

The magnetic ball 17b is located in the inner space of the housing 18b, that is, the inner space of the shower head inlet 19 formed as the housing 18b is coupled to the shower head inlet 15, It flows freely and comes into contact with water.

In addition, the metal ring 19b may be made of a material such as gold, silver, brass, copper, zinc, aluminum, stainless steel, titanium, or the like, and the metal ring 19b has a housing 18b adjacent to the opening/closing hole 22 . It is installed in a structure that is fitted to the inner wall of the , and the magnet ball 17b can be positioned in the inner region of the metal ring 19b installed in this way.

Accordingly, the magnetic ball 17b is able to flow while intermittently colliding with the metal ring 19b at this time in the space surrounded by the metal ring 19b by the flow rate of water, and the operation of the magnetic ball 17b Due to the characteristics and material characteristics of the metal ring 19b, strong magnetic energy for generating magnetized hexagonal water as well as electromagnetic fields necessary for sterilization of various harmful bacteria can be generated.

In addition, in the case of the magnetic ball 17b, when water is continuously supplied, it continuously flows and makes a rattling sound, and the user can visually see the movement of the magnetic ball 17b, It is possible to provide a visual effect as well as an auditory effect to the user.

On the other hand, as the magnetic balls 17a and 17b freely flow on the path through which the water flows and are in continuous contact with water, the water molecular structure is converted into ion-activated water, that is, a magnetized hexagonal water by the very strong magnetic force of the magnet. be able to

In other words, water particles (clusters) are fine and , it is possible to provide functional water having a high dissolved oxygen content, rich in minerals, weak alkaline water, and hexagonal water having a hexagonal ring structure.

5 is a cross-sectional view showing a use state of a filter shower having a sterilization function according to an embodiment of the present invention.

As shown in Fig. 5, the filter shower having the sterilization function can be used by being connected to the faucet fitting in the bathroom or the faucet fitting in the sink.

For example, when the water inlet 12 of the shower body 13 is connected to a water pipe extending toward the faucet of the bathroom, and the tap water is turned on by operating the lever of the faucet in the bathroom, the tap water at this time has a sterilization function. After being purified and sterilized through a filter shower, it can be used as shower water after being purified.

Here, the tap water supplied from the faucet side of the bathroom is the water inlet 12 → inside the housing 18a of the primary anti-sterilization unit 20 → the space area between the filter assembly 16 and the shower body 13 → The inside of the filter assembly 16 → the inside of the housing 18b of the secondary antibacterial/sterilizing part 21 → the inside of the shower head 11 → the non-woven fabric filter 28 of the auxiliary filter 29 → the water outlet 10 ), so that the user can take a bath with shower water.

At this time, when water flows into the first anti-sterilization unit 20 and the secondary anti-sterilization unit 21, the magnetic balls 17a and 17b collide with the surroundings due to the water pressure at this time and make a clicking sound. In other words, it flows strongly while colliding with the surroundings in the inner region of the metal ring (19a, 19b) made of copper or brass material, and eventually the electric and magnetic field by the flow (rotation) of these magnetic balls (17a, 17b) As this occurs, microorganisms and various harmful bacteria included in the water can be sterilized.

In other words, the magnetic balls (17a, 17b) rotating by the flow rate and the metal rings (19a, 19b) made of brass with excellent electrical conductivity generate semi-permanent anti-bacterial action through the generation of metal ions and electromagnetic fields. do.

And, by passing the tap water through the filter assembly 16 and the auxiliary filter unit 29, as well as the primary anti-sterilization unit 20 and the secondary anti-sterilization unit 21, it is purified and various bacteria are removed, Magnetized hexagonal water that is rich in minerals and beneficial to human skin can be obtained.

As described above, in the present invention, it is possible to semi-permanently automatically sterilize various harmful bacteria propagating in the shower filter and inside the shower wet after showering, and it also blocks the generation of organic chlorine chemicals in the water and contains strong magnetic energy. By providing a new filter shower that can generate magnetic hexagonal water, it is possible to supply beneficial water to the human body when drinking as well as showering.

10: water outlet
11: shower head
12: water inlet
13: shower body part
14: shower body
15: shower head entrance
16 : filter assembly
17a, 17b: magnetic ball
18a, 18b : housing
19a, 19b: metal ring
20: Primary anti-sterilization unit
21: Secondary anti-sterilization unit
22: opening and closing hole
23: water discharge hole
24 : leg
25: lower cap
26: Hall
27 : filter box
28: non-woven filter
29: auxiliary filter unit
30: outgoing edition
31: silicone ring
32: head cap
33: jamming jaw
34: filter body
35: upper cap

Claims (3)

The shower body 14 is composed of an assembly type of a shower head 11 having a water outlet 10 at the top front for discharging water and a shower body 13 having a water inlet 12 at the bottom for water inflow. );
While being located inside the shower body 13, it is connected to the shower head inlet 15 of the shower head 11 through the upper center and induces a flow of water from the outer periphery toward the center to remove impurities in the water. cylindrical filter assembly 16;
A magnetic ball 17a installed on the water inlet 12 side of the shower body 13 and freely flowing by the flow rate of water, a housing 18a accommodating the magnetic ball 17a, and the shower body (13) while being installed around the inner wall of the primary anti-sterilization unit 20 consisting of a metal ring (19a) in contact with the magnetic ball (17a);
A magnet ball 17b installed at the shower head inlet 15 of the shower head 11 and freely flowing by the flow rate of water, a housing 18b accommodating the magnetic ball 17b, and the housing ( 18b) while being installed around the inner wall of the secondary anti-sterilization portion 21 consisting of a metal ring (19b) in contact with the magnetic ball (17b);
includes,
The housing 18a of the primary anti-sterilization unit 20 has a circular cap shape with an open lower part, and has a relatively small diameter compared to the diameter of the magnet ball 17a on the upper plate of the housing 18a. The opening/closing hole 22 located in the center and a plurality of water discharge holes 23 located at the outer portion along the periphery of the opening/closing hole 22 are formed, and the upper plate of the housing 18a is radially disposed on the bottom surface of the housing 18a. While having a plurality of legs 24 arranged as A filter shower having a sterilization function, characterized in that the water from the filter assembly (16) can be guided to an area between the outer periphery of the filter assembly (16) and the inner wall of the shower body (13).
The method according to claim 1,
The metal rings 19a and 19b of the primary anti-sterilization unit 20 and the secondary anti-sterilization unit 21 are made of any one material selected from gold, silver, brass, copper, zinc, aluminum, stainless, and titanium. Filter shower having a sterilization function, characterized in that consisting of.
The method according to claim 1,
Inside the shower head unit 11, a cylindrical filter box 27 having a plurality of holes 26 on the front and back sides adjacent to the water outlet 10 and opening and closing, and the filter box 27 Filter shower having a sterilization function, characterized in that it further comprises an auxiliary filter unit (29) composed of a built-in nonwoven filter (28).

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