FI77164C - Air Purifier - Google Patents

Description

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Air cleaner Luftrenare

The invention relates to an evening cleaner which is intended for use, for example, in a so-called as a grease filter in the exhaust air systems of institutional, bar, barbecue and restaurant kitchens or similar premises, the air purifier comprising a purifier section formed of the chambers and a frame-5 structure.

One important area of use of the air purifier is the so-called grease filters. Air polluted during cooking is sucked in through the grease filters. In professional gardens, such as restaurant, grill bar and institutional kitchens, air pollution during cooking is a particular problem.

The grease filter separates grease and soil impurities from the fumes and soils generated during cooking and thus prevents these flammable and otherwise harmful substances from entering the air conditioning system. The grease filter is usually placed in an exhaust air device above the stove or the like. Multiple grease filters can be used side by side.

20 The purpose of grease filters is to prevent contamination of ductwork and fans, thus reducing the need to clean the air conditioning system and improving fire safety and hygiene. The grease filter is set e.g. following requirements. Naturally good filtration efficiency. The degree of self-cleaning based on filter grease runoff should be as good as possible. The cleaning interval of the filter should be long without increasing the resistivity of the filter or changing the cleaning efficiency. The filter should be easy to maintain and inspect. The filter must be as fireproof and hygienic as possible. The filter must also be durable and user-friendly.

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Today, the so-called grease filter is commonly used as a so-called collision filters consisting of overlapping metal mesh or netting and a metal fiber mat. The disadvantage of such filters is that the resolution is usually too low. The filter often requires maintenance because the 5 grease adheres to the filter material and does not drain into the gutter. Cleaning is difficult. These disadvantages also result in an increase in the risk of fire as well as a significant increase in the loss of ominals compared to a clean filter, which reduces the amount of combustion air and the quality of the indoor air. The service life of such filters is relatively short. 10 They are easily damaged during installation, use or cleaning.

The so-called grease filter is also used. centrifugal filters. The resolution of current centrifugal filters is also relatively low due to their structure. For example, U.S. Pat. No. 3,834,135, U.S. Pat. No. 3,910,782 and U.S. Pat. No. 3,566,585 can be mentioned as an inappropriate form of elements in a grease filter. Their structure is also unnecessarily complicated, which makes the filter relatively expensive. In practice, the resolution of center exhaust filters as well as collision filters varies greatly depending on the magnitude of the air flow. Efforts have been made to eliminate this drawback with adjustable filters. When several differently adjustable filters are used in the same kitchen, the problem is the risk of them getting mixed up, eg after washing.

However, centrifugal filters achieve certain advantages. The service life of centrifugal-25 filters is usually practically unlimited. Filter efficiency is also not reduced with washes as with fiber filters. The fire safety of a centrifugal filter is also better than that of fiber filters. The centrifugal filter also does not bind flowing grease to the filter, as the separated grease drains away effectively.

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Currently, there are also grease filters that use two filters in a row. Such so-called two-false filters are good in principle, but if both stages in both filters filter the same particle size as in the current solutions, 35 the latter stage is practically quite inefficient.

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A problem with kitchen ventilation is those particle sizes that contaminate ducts and fans and significantly increase the risk of fire. The development of existing grease filters has apparently not taken this into account. critical particle sizes, making their structure and function quite 5 inappropriate.

Ko. of particle size it can be said that there is no particular particular size but the boundary is "sliding". However, particles with a size greater than 5 μm cause more significant fouling. At present, mechanical separators 10 cannot separate particles smaller than a certain particle size (about 2-4 μm), which is also not necessary in grease filters.

It is an object of the invention to provide a better filter than current grease filters. A detailed object of the invention is an air purifier which is very useful in the so-called a coarse filter to which, for example, current grease filters are assigned. The object of the invention is to provide an air purifier having a sufficiently good resolution, thus preventing contamination of the ducts and fans. Yet another object of the invention is to provide an air purifier which is also easy to maintain, non-flammable, reliable and substantially prolongs the service life of fine filters if, in addition to coarse filters, a fine filter is also used in the solution.

The objects of the invention are achieved by an air purifier, which is mainly characterized in that the purifier section has a plurality of lamellae extending from its front or inflow surface to its rear or discharge surface.

According to claim 2, two parallel lamellae delimit a flow passage through the cleaning section, from which the air flow is arranged to flow substantially without distribution.

According to claim 3, the lamella has an inlet side forming the front surface 35 of the cleaning section and, on the other hand, a discharge side forming the rear surface of the cleaning section, which are of different shapes.

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According to claim 4, the lamellae have two or more cam grinders adapted to provide vortices in the air flow to enhance air cleaning.

According to claim 5, the lamellae are S-shaped in cross section or have an S-shaped part.

According to claim 6, the lamellae have a Y-shaped cross section or a Y-shaped part.

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According to claim 7, the lamellae are attached to the frame structure on both the inflow and outlet sides.

The air purifier according to the invention achieves all the desired properties required for a good grease filter. The filtration efficiency of the air purifier according to the invention is good, the air purifier is very reliable, because, for example, even a large amount of soiling does not change the air volumes and does not cause a large frost loss.

The invention will be explained in detail with reference to an embodiment of the invention shown in the figures of the accompanying drawings, to which, however, the invention is not intended to be exclusively limited.

Figure 1 shows a front view of a preferred embodiment of an air purifier according to the invention.

Figure 2 shows a top view of the air purifier according to Figure 1.

Figure 3 shows a side view of the air cleaner according to Figure 1.

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Figure 4 shows a section along the line IV-IV in Figure 1.

Figure 5 shows in cross section a lamellar structure used in an air cleaner according to the invention.

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In the embodiment according to Figures 1-3, the air cleaner according to the invention is generally indicated by the reference number 10. In this embodiment, the air cleaner 10 comprises a filter part 11, a lower collar 12, an upper collar 13 and side collars 14a and 14b. The position of the hand-5 in the side collars 14a and 14b is denoted by reference numeral 15. In this embodiment, both the lower collar 12 and the upper collar 13 are provided with a plurality of spaced holes 16 through which fat exits into the grease groove below the lower collar 12. Of course, it is not necessary to provide the upper collar 13 with holes 16, but the embodiment shown is advantageous in the sense that it does not matter during installation whether the lower collar 12 comes down or up, since both collars 12 and 13 are provided with holes 16.

According to Figure 4, the air cleaner consists of a plurality of lamellae 15, generally indicated by reference numeral 17. A more detailed structure of the lamella structure 17 is shown in Figure 5. In this embodiment, the lamella structure 17 includes four cam-like members 18a, 18b, 18c and 18d. As can be seen from Fig. 4, the fat-containing air flow indicated by the arrow A flows through the lamellae 17 of the fat filter so that the through air flow A11 is distributed as it flows through the lamellae 17. As airflow A flows through, vortices are formed at the locations shown in Figure 4, indicated by arrows B. The fat involved in the airflow is separated from airflow A at locations 19, 19 'and 19 "in Figure 4. Most of the fat is separated in the inter-vortex space." "19.

In the embodiment according to Figure 4, the separation of the fat from the air flow A takes place between two lamellae 17 placed in each other. The lamellae 17 are attached to the upper and lower collars 12 and 13 of the air cleaner 10 on both sides.

Although the lamellar structure 17 shown in Fig. 5 comprises four cam-like members 18a, 18b, 18c and 18d, the air flow A according to the invention is also achieved with a lamellar structure 17 comprising only cam-like members 18a and 18b. However, it is preferred to use one with waves 17 having at least three cam-like portions that provide vortices B to enhance fat separation.

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The lamellae 17 are preferably S- or Y-shaped in cross section or have an S- or Y-shaped part. The lamellae 17 have an inlet side forming the front surface of the cleaning section 11 and a discharge side forming the rear surface of the cleaning section 11, which are of different shapes from each other.

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Only one preferred embodiment of the invention has been described above, and it will be clear to a person skilled in the art that numerous modifications can be made to it within the scope of the inventive idea set out in the appended claims.

Claims (7)

1. Air purifiers intended to be used, for example, as so-called air purifiers. grease fields in open-air systems in plant, bar, grill and reetauran kitchens or similar spaces, to which air purifiers have a renner part (11) formed (11) and a body structure (12,13,14a, 14b) known as -characterized by the fact that the cleaner part (11) has several slats (17) extending from its front or inflow surface to its rear or outer surface. 10 1 Patent claim Air purifier according to claim 1, characterized in that two wide lamellae (17) are located limiting a flow passage through the rendering section, from which an air stream (A) Mr arranged to flow substantially without dividing. 15 Air purifier according to claim 2, characterized in that the slats (17) have a longitudinal slit which forms the front surface of the riser part (11) and, on the other hand, an outlet side which forms the rear surface of the renter part, which slides have a different shape. 20 Air cleaner according to any of claims 1-3, characterized in that the louvers (17) have two or more beak-shaped parts (18a, 18b, 18c, 18d) which Mr arranged to provide swirls (B) in the air flow for power delivery. of the air purification. 25 An air cleaner according to any of claims 1-4, characterized in that the slats (17) are of the S-shaped cross section or have an S-shaped part. An air cleaner according to any of claims 1-4, characterized in that the slats (17) Mr of the cross-section are Y-shaped or have a Y-shaped part. Air purifier according to any of claims 1-6, characterized in that the louvers (17) are attached to the body structure (12, 13) which bite into the instrumentation and outflow chamber.