DE20102452U1 - Ventilation grille - Google Patents

Description

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Description
Ventilation grille

The invention relates to a ventilation grille for a housing with electrical components to be cooled and with at least one perforated air inlet area, wherein the ventilation grille has a slatted part and a filter mat.

There are ventilation grilles available on the market that have a ventilation grille bottom and a slatted top. The ventilation grille bottom is used to hold a filter mat. After the filter mat has been placed in the ventilation grille bottom, the slatted top is placed on the ventilation grille bottom.

When using such a ventilation grille in a housing with electrical components, particularly in a control cabinet, it has a corresponding opening for the housing. With this opening, the upper slatted part can also be used alone. If only one upper slatted part is used, a protection level is obtained for contact and foreign body protection (protection against solid foreign bodies 12.5 mm in diameter and size) and for water protection (protection against spray water). A higher protection level is only obtained if the ventilation grille lower part with filter mat is also used in addition to the upper slatted part. With this latter arrangement, a protection level of, for example, IP54 is obtained. If only the upper slatted part is used, a protection level of, for example, IP23 is obtained.

Cabinet-mounted converters are available commercially and are designed for various degrees of protection. In the case of a current intermediate circuit converter for drives up to 2600 kW (Siemens brochure "Simovert A", order no. A191000-E319-A375, printing note: PA8893.), the lower part of the

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A perforated air inlet area is arranged on the front door of the control cabinet of the power converter. This perforated air inlet area is made up of a number of rectangular recesses (gill embossing). The degree of protection is determined depending on the geometric dimensions of these recesses. With this perforated air inlet area, a degree of protection IP31 or IP32 is achieved.

If you want to increase the protection level for contact and foreign body protection, you must use a filter mat that is attached to the inside of the door using a ventilation grille (Siemens brochure "Variable-speed drives in practice", order no. A19100-E319-A365, page 48, March 1989). The filter mat increases the protection level to IP51 or IP52. However, a qualified specialist is required to change the filter mat, as the control cabinet must be opened to replace the filter mat.

In another commercially available converter (Siemens brochure "Simovert P" Order No. A19100-E319-A371, printing note: PA9895.), the lower part of the front door of the converter's control cabinet is provided with several openings that are covered by several ventilation grilles (consisting of a louvre top section and a ventilation grille bottom section). These louvre top sections only provide a level of protection against water, which for example is IP23. If a higher level of protection is to be achieved for the contact and foreign body protection area (dust protection - IP54), a filter mat is inserted in each of the ventilation grille bottom sections (Siemens brochure "Variable speed drive in practice", Order No. A191000-E319-A365, page 57, March '89).

Another commercially available converter (Siemens brochure "Simovert Masterdrives", order no.

E20002-K4065-A121-A1 and Siemens brochure "Simovert Masterdrives Vector Control", order no. E86060-K5165-A100-A1),

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The different protection levels in the lower part of the front door are achieved with two differently designed doors. The protection level IP20 is achieved with a perforated door, whereby this perforated air inlet area is formed from a number of rectangular recesses. The protection level is determined depending on the geometric dimensions of these recesses. A protection level >IP20 is achieved with several larger openings in the lower part of the front door, which are covered by several ventilation grilles, consisting of a slatted upper part and a ventilation grille lower part.

These commercially available converter devices achieve different degrees of protection, which cannot, however, be achieved simultaneously with the control cabinets. Different cabinet doors must always be available in order to meet customer requirements. In the version with the perforated air inlet area, only a degree of protection of IP20 or IP31 or IP32 can be achieved as the highest degree of protection. In the version with one or more large openings, a degree of protection with contact and foreign body protection is only possible in conjunction with a degree of protection for water protection. Furthermore, in certain applications (filter mat is in the

25- Cabinet) always have a qualified specialist change the filter mat.

From an older national application (official file number 100 38 821.3) a ventilation grille for a housing with electrical components to be cooled and with at least one perforated air inlet area is known, wherein the ventilation grille has a slatted upper part and a ventilation grille lower part, wherein the base of the ventilation grille lower part has a perforation corresponding to the perforated air inlet area of the housing and its frame has several locking hooks. The slatted upper part has at least two group pairs of several locking hooks which are arranged on the slats

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facing away. The locking hooks of the ventilation grille lower part and the slat upper part are assigned to different areas of the perforated air inlet area of the housing.
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The design of the ventilation grille base means that it can also be attached to the front of the cabinet door. The locking hooks on the ventilation grille base snap into a recess in the perforation of the housing door. Because the design of the ventilation grille base means that the filter mat can now also be attached to the front of the housing door, a qualified specialist is no longer required to change the filter. Furthermore, the slatted top can be snapped onto the ventilation grille base or onto the air inlet area of the housing door, depending on its different locking hooks. One group pair of several locking hooks locks the slatted top onto the perforated air inlet area of the housing door, while the other group pair of several locking hooks locks it onto the bottom of the ventilation grille base. If the slatted top is snapped onto the bottom of the ventilation grille base and a filter mat is inserted, the protection level changes from IP23 to IP54, for example.

The invention is based on the object of specifying a ventilation grille which can dispense with a ventilation grille base when increasing the degree of protection of a housing, in particular a control cabinet.

This object is achieved according to the invention with the characterizing feature of claim 1.

Because the slatted part has a surrounding frame with several locking hooks on the side facing away from the slats, which serves as a holding device for a filter mat

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The degree of protection can be increased without the need for a ventilation grille base. This slatted part according to the invention can be snapped onto the perforated area of a control cabinet door from the outside together with a filter mat. A qualified specialist is no longer required to change the filter mat, as the control cabinet remains closed when the filter mat is changed.

In an advantageous embodiment of the ventilation grille according to the invention, the frame of the slatted part is designed to accommodate a seal on the side facing away from the slats. This allows the degree of protection against water to be increased even further.

Advantageous embodiments of the ventilation grille according to the invention can be found in subclaims 3 and 4.

To further explain the invention, reference is made to the drawing, in which the ventilation grille according to the invention is schematically illustrated.

FIG 1 shows a longitudinal section through a slat part of the ventilation grille according to the invention, FIG 2 illustrates an exploded view of the ventilation grille according to the invention and in FIG

FIG 3 shows an assembled ventilation grille according to the invention.

FIG. 1 shows a longitudinal section through a slat part 2 of the ventilation grille according to the invention. This slat part 2 according to the invention differs from a slat upper part according to the prior art described at the beginning in that this slat part has a peripheral edge 4. This peripheral edge 4 is designed in such a way that it forms a receiving device 20 for a filter mat 18, which is not shown in more detail in this illustration.

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is shown. In addition, this peripheral edge 4 has a plurality of spring-loaded locking hooks 8 on the side of the slat part 2 facing away from the slats 6. These locking hooks 8 are arranged on the peripheral edge 4 of the slat part 2 in such a way that they can snap into recesses in the perforated air inlet area 10 of the switch cabinet door 12 of a switch cabinet.

In order to further increase the level of protection against water, a sealing ring 14 is used which is previously inserted or molded into a circumferential recess 16 of the edge 4. This seal 14 can be a rubber seal which is punched out of a rubber plate as a ring, with one side of this rubber plate being self-adhesive in particular. The seal 14 can also be a rubber bead which is inserted into the circumferential recess 16 or a seal which is molded onto the front side of the circumferential edge. For example, a groove is provided as the recess which is simply milled into the front surface of the circumferential edge 4 of the slat part 2.

By using a filter mat 18, which is inserted into the receiving device 20 formed by the peripheral edge 4, the degree of protection against foreign bodies and water is increased. In conjunction with the filter mat 18, a degree of protection IP54 is achieved, although the ventilation grille only has one slat part 2.

FIG. 2 shows an exploded view of an assembly of the ventilation grille according to the invention, with FIG. 3 showing the operational state of this ventilation grille. In this exploded view, all parts 2, 18 and 14 are arranged outside a control cabinet (not shown). These parts 2, 18 and 14 are assembled one after the other in the order shown, with the slatted part 2 being placed on the perforated air inlet area 10 after the filter mat 18 and the sealing ring 14 have been received.

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the control cabinet door 12. If the slatted part 2 and the sealing ring 14 are a single unit, only the filter mat 18 needs to be inserted. Using the sealing ring 14 increases the level of protection against water even further. If, for example, a rubber seal is used as the sealing ring 14, which is punched as a ring from a rubber sheet, one side of which is self-adhesive, no holder 16 is required in the front side of the surrounding edge 4. This self-adhesive rubber seal can be glued directly onto the front side of the surrounding edge 4. If a circumferential groove is made in the surrounding edge 4 as a holder 16 for a sealing ring 14, the assembly of this sealing ring 14 is simplified. A sprayed-on sealing compound that is applied to the front side of the surrounding edge can also serve as a seal.

FIG 3 shows that the slatted part 2 is snapped onto the perforated air inlet area 10 of the control cabinet door 12 of a control cabinet (not shown in detail) by means of locking hooks 8. The locking hooks 8 are designed in such a way that they lock into recesses in the perforation of the air inlet area 10 of the control cabinet door 12. For this purpose, these locking hooks are designed to be spring-loaded. So that the slatted part 2 can be removed from the air inlet area 10 in order to replace the filter mat 18, the length of the locking hook 8 is smaller than the length in the longitudinal direction of the cuboid-shaped recesses in the perforation of the air inlet area 10. In addition, the hook of this spring-loaded locking hook 8 is designed on the inside in such a way that the hook can be moved out of the locked state without excessive force when the slatted part 2 is moved in the longitudinal direction of the cabinet door 12. Due to this design of the locking hook 8, the slat part 2 can be removed from the air inlet area 10 and reattached at any time by any person for the purpose of replacing the filter mats.

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Thanks to the inventive design of the slat part 2, a protection level of IP54 can now be achieved without the need to use a ventilation grille base. This makes the ventilation grille much simpler, which also makes handling much easier.

Claims (4)

1. Ventilation grille for a housing with electrical components to be cooled and with at least one perforated air inlet area ( 10 ), the ventilation grille having a slatted part ( 2 ) and a filter mat ( 18 ), characterized in that the slatted part ( 2 ) has, on the side facing away from the slats ( 6 ), a peripheral edge ( 4 ) with a plurality of locking hooks ( 8 ), which is designed as a receiving device ( 20 ) for the filter mat ( 18 ). 2. Ventilation grille according to claim 1, characterized in that the edge ( 4 ) of the slat part ( 2 ) on the side facing away from the slats ( 6 ) is designed to receive a seal ( 14 ). 3. Ventilation grille according to claim 2, characterized in that a circumferential groove is provided to accommodate a seal ( 14 ). 4. Ventilation grille according to claim 1 or 2, characterized in that the locking hooks ( 8 ) are resilient.