JPH0619809U - Filter for ventilation fan - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of the present invention is to eliminate oil dripping, which is the greatest drawback of conventional punching filters, and to improve oil collection efficiency. [Structure] By providing an oil recovery groove by press working in the vertical direction of the center of the punching hole of the punching filter, the oil collected in the punching hole is collected in the oil recovery container without collecting in this part. It is a thing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a grease filter using a punching hole for a range hood.

[0002]

[Prior art]

 Conventionally, grease filters used for range hoods and the like have the following drawbacks. a) The punching filter is the filter that has the best cleaning properties, but in order to improve the oil collection efficiency, it is necessary to keep an eye on the fact that the ventilation resistance is increased to some extent and to reduce the opening ratio. The biggest drawback is that oil drops occur during use. b) The lath net type filter has been used for a long time together with punching, and the oil collection efficiency is better than the punching type, but the cleanability is the worst and it is impossible to clean. Is high. c) A filter made by cutting and raising slits in a thin metal plate is a filter that has recently begun to be used as a filter to replace punching. Cleanability is worse than punching because it has a cut-and-raised part. The oil collection efficiency is also better than conventional punching due to its balance with ventilation resistance. However, with this type of filter, dust in the air adheres to the oil collected in the slits when the range hood is not used, and becomes grease-like, causing the slits that are ventilation holes to become clogged. . This clogging is a drawback that punching does not have.

[0003]

[Problems to be solved by the device]

 The problem to be solved by this invention is to improve the punching filter, which has the best cleaning performance, and the oil collected in the punching holes, which causes oil dripping, is not collected in this part. This is the problem to be solved by the present invention.

[0004]

[Means for Solving the Problems]

 As a means for solving this problem, in the present invention, a groove for oil recovery by press working is provided in the central part of the punching hole in the vertical direction, so that the oil in the punching hole is gradually recovered by the recovery groove. By collecting the oil from the inside, we try to eliminate the oil dripping, which was the biggest drawback of the past.

[0005]

【Example】

 Referring to the drawings of the present invention, what is shown in FIG. 1 is an improved type of a filter 2 which uses a round hole, a vertically elongated hole, and a punching hole 1 in which the round hole and the vertically elongated hole are combined. In the grease filter, the open area ratio, the air flow resistance and the oil collection efficiency are closely related. If the open area ratio is increased, the air flow resistance is reduced, but the oil collection efficiency is reduced. If the aperture ratio is reduced, the ventilation resistance is increased but the oil collection efficiency is increased. On the other hand, the present invention maximizes the oil collection efficiency in a state where the ventilation resistance is low, and at the same time, eliminates the oil dripping, which is the biggest drawback of conventional punching filters. . In order to prove this, a comparative measurement is actually performed, and the measurement data will be used for explanation. For this measurement, a punching filter having an opening ratio of 50% (hereinafter referred to as A) and a filter having a groove 3 for oil recovery provided in the longitudinal direction of the central portion of the punching hole 1 of the filter (hereinafter referred to as B) are used. , And a filter (hereinafter referred to as C) in which a metal thin plate is cut and raised to have slits are comparatively measured. The graph shown in FIG. 2 is a measurement of the ventilation resistance of a punching filter having an opening ratio of 50%, and is the same for AB. On the other hand, the graph shown in FIG. 3 is a measurement of the ventilation resistance of C. Now, in the order of ABC, the oil collection efficiency is measured when the installation angle of the measurement filter is 11 degrees. If it is A, the oil collection efficiency due to the adhesion of the filter is 15.8%. Efficiency 5.0% Total 20.8% In this case, there was oil dripping during the measurement. On the other hand, in the case of B, oil collection efficiency due to the attachment of the filter 15.0% Oil recovery efficiency of the oil recovery container 15.2% 30.2% No oil dripping during measurement. In the case of C, the oil collection efficiency due to the attachment of the filter was 17.4%, the oil recovery efficiency of the oil recovery container was 4.3%, and the total was 21.7%. There was no oil dripping during the measurement, and some clogging was observed. As can be seen from this, even if the punching filter 2 has the same opening ratio of 50%, by providing the oil collecting groove 3 in the longitudinal direction of the central portion of the punching hole 1, the groove 3 is formed in the groove 3 during measurement. In addition, the oil collected in the punching hole 1 was gradually collected in the collection container, the oil dripping was eliminated, and the oil collection efficiency was increased as a whole. Compared to the C type filter that has recently been used, it has no clogging, has a good oil collection efficiency, and has good cleaning performance. As with the C type, the cut-and-raised part cuts hands during cleaning. It is excellent without any trouble. Although this measurement requires a mounting angle of 11 degrees as a condition, if it is set to 45 degrees, the efficiency will be further improved, and if two filters are stacked, the efficiency will be further improved.

[0006]

[Effect of device]

 The effect of the invention is a grease filter with good cleaning performance, no oil dripping, no clogging, low air resistance, and excellent oil collection efficiency.

[Brief description of drawings]

Fig. 1 Enlarged view of the grease filter part of the present invention

[Fig. 2] Ventilation resistance characteristics of a punching filter with an opening ratio of 50%.

[Fig.3] Ventilation resistance characteristics of the type in which a thin metal plate is cut and raised.

[Explanation of symbols]

 1 punching hole 2 grease filter 3 oil recovery groove

Claims (1)

[Scope of utility model registration request] 1. A grease filter 2 having a round hole, a vertically long hole punching hole, and a punching hole 1 having a combination of a round hole and a vertically long hole. A ventilation fan filter provided with a collecting groove 3.