KR20090115153A - Resonator arrangement for the cabinet of a refrigeration appliance - Google Patents

Abstract

The invention refers to a resonator arrangement for the cabinet of a refrigeration appliance, said cabinet (3) defining a housing (1) and carrying, in the latter, a compressor (2) presenting a hermetic casing (2a) and a defrost water evaporating tray (10) comprising: a bottom wall (11), to be seated onto an upper portion of the casing (2a) of the compressor (2); and a peripheral wall (12) superiorly projecting from the bottom wall (11), at least one of the peripheral wall (12) and bottom wall (11) of the evaporating tray (10) carrying a noise absorbing means turned to a noise generation region in said housing (1) and being dimensioned to define a certain reactive impedance and a certain dissipative impedance in the medium of the housing (1) for a determined frequency band.

Description

Resonator arrangement for cabinets in refrigeration plants {RESONATOR ARRANGEMENT FOR THE CABINET OF A REFRIGERATION APPLIANCE}

The present invention relates to a resonator arrangement provided in a cabinet of a refrigeration plant, in particular in its region for receiving a compressor of the refrigeration system of the refrigeration plant, the operation of the compressor and / or fan provided in the region of the housing. It is well known that noise is generated from the photonic acid. In a more particular method, the invention relates to a resonator arrangement provided in a thawed water evaporation tray of a refrigeration system of a refrigeration plant, wherein the evaporation tray is in the form of being attached on a casing of a hermetic compressor of the refrigeration system.

Noise emitted by the refrigerator can be limited to two regions in the spectrum: frequencies below about 2 kHz and those frequencies above this value.

In the first spectral region defined by the lower frequency, through excitation of the first acoustic resonance of the housing defined within the rear lower region of the refrigeration plant, to which the compressor of the refrigeration system of this refrigeration plant is mounted, There is a strong interaction between the refrigeration plant and the compressor. This frequency is fundamentally dependent on the dimensions of the housing of the compressor and the spectral composition of the noise emitted by the compressor. Another common source of noise in refrigeration plants is a fan that is generally located within the refrigeration plant in the housing in which the compressor is mounted. In addition to generating high frequency noises generated by turbulence, the fan provides strong radiation energy within the blade passage frequency, which calculates the number of blades by rotational frequency. .

In the second spectral region, where the frequency is generally above 2 kHz, the compressor emits noise directly, without much interference of the structure or form of the housing in which the compressor is mounted in the refrigeration plant.

Research reports vary in many examples and applications of noise control techniques. (Hansen, H. "Noise Control Engineering", 2003, Spawn Press; Lyon, R. H., "Machine Noise and Diagnostics", 1987, Butterworth Press; Munzal, M. L. "Acoustics of Ducts and Mufflers" ", Willy-International, New York, 1987).

In the known prior art, the housing 1 on which the compressor 2 is mounted is coated with soundproof material MA (FIG. 2), and the housing 1 is also in its inner side, as illustrated for example in FIG. 3. The walls can be closed by a plate P, which defines an end lid in which a soundproof material MA is provided therein for coating the housing which cannot accept the material. In this solution, the compressor is kept closed on the inside of the housing 1 by closing the housing 1.

When the control technique described above cannot be used, control must be made in the compressor, either by increasing the thickness of the casing or by adding dampening elements thereto.

Such techniques include the necessary functionality for a process for mounting and placing coating and closing elements of a housing surrounding a compressor in a refrigeration plant, including: high cost soundproof materials for coating or closing; The need to increase its cost to change the compressor; Increase in compressor temperature; Reduction in fan efficiency; Reduction in compressor efficiency; And such drawbacks as the requirement of additional steps in the process for obtaining the refrigeration plant.

[Purpose of invention]

It is a first object of the present invention to provide a resonator arrangement for a cabinet in a refrigeration plant that allows the frequencies radiated by the compressor to be effectively attenuated in a wide frequency band, both at low and high frequencies.

It is a second object of the present invention to provide a resonator arrangement as described above which allows for effective attenuation in a wide frequency band of noise generated by a fan mounted in a refrigeration installation in its region containing the compressor.

It is a third object of the present invention to provide a resonator arrangement as described above which allows for effective attenuation in a wide frequency band of noise radiated by the refrigeration system.

It is a fourth object of the present invention to provide a resonator arrangement as described above which allows for effective damping of the resonance inside the housing in which the compressor is mounted in the refrigeration plant.

It is a fifth object of the present invention to provide a resonator arrangement of the type described above which does not require a soundproof coating of the housing in which the compressor is mounted in the refrigeration plant, nor does it change the dimensions of the housing.

A sixth object of the present invention is to provide a resonator arrangement of the type described above that does not require changing the dimensions and / or thickness of the compressor casing.

[Summary of invention]

These and other objects of the present invention define a housing and include a cabinet supported within the housing, a compressor providing a sealed casing, and a thawed water evaporation tray, wherein the thawed water evaporation tray comprises a casing of the compressor. A bottom wall installed on the upper portion of the; And an upper peripheral wall projecting from the bottom wall, wherein at least one of the peripheral wall and the bottom wall of the evaporation tray supports the noise absorbing means as a whole in the at least one resonator conductor facing the noise generating area in the housing, the predetermined frequency For the band, it is obtained through the provision of a resonator arrangement for the cabinet of the refrigeration plant, dimensioned to define the desired reactive impedance and the desired dispersible impedance within the medium of the housing.

The invention will be described below with reference to the accompanying drawings, given by way of illustration of possible embodiments of the invention:

1 schematically shows a longitudinal cross-sectional view of a refrigerating installation defining from below a rear a housing on which a refrigeration compressor for supporting an evaporation tray from top to outside is mounted.

FIG. 2 diagrammatically shows the longitudinal cross section illustrated in FIG. 1, wherein the housing in which the refrigeration compressor is mounted is coated with a noise absorbing material according to the prior art.

FIG. 3 shows a partial side cross-sectional view of the refrigeration plant illustrated in FIG. 1 and shows having a refrigeration compressor housing closed by a noise absorbing wall constructed according to the prior art.

4 schematically shows an enlarged view of a refrigeration compressor supporting an evaporation tray, as illustrated in FIG. 1, but showing that the evaporation tray is configured according to the first structural choice of the invention. .

4a schematically illustrates a variant of the first structural choice for an evaporation tray according to the invention, as illustrated in FIG. 4.

FIG. 5 is a diagram schematically showing a plan view of the evaporation tray illustrated in FIG. 4.

FIG. 6 is a schematic illustration of a longitudinal cross-sectional view of the evaporation tray illustrated in FIG. 5 taken along the line VI-VI indicated in FIG. 5 above.

FIG. 7 is a diagrammatic view of a diagram for a second structural selection of the invention, as illustrated in FIG. 5.

FIG. 8 is a diagram schematically showing the view taken along the second line VIII-VIII indicated in FIG. 7, as illustrated in FIG. 6.

FIG. 9 is a diagrammatic view of the drawings for the third and fourth structural selections of the invention, as illustrated in FIG. 5.

FIG. 9A is a diagram schematically illustrating a diagram of a structural variant of the third and fourth structural selections illustrated in FIG. 9, as illustrated in FIG. 9.

FIG. 10 is a diagrammatic view of the diagram as illustrated in FIG. 8 taken along the second line X-X indicated in FIG. 9.

FIG. 11 is a diagram schematically illustrating a diagram for a fourth structural selection of the present invention, as illustrated in FIG. 9.

FIG. 12 is a diagram schematically showing a view taken along the second line XII-XII indicated in FIG. 11, as illustrated in FIG. 10.

FIG. 13 is a diagram schematically illustrating a diagram for a fifth structural selection of the present invention, as illustrated in FIG. 9.

FIG. 14 is a diagram schematically showing a view taken along the second line XIX-XIX indicated in FIG. 13, as illustrated in FIG. 13.

FIG. 15A is a diagrammatic view of a diagram for a sixth structural selection of the present invention, as illustrated in FIG. 8.

FIG. 15B is a diagram schematically showing a variant of a sixth structural selection of the present invention, as illustrated in FIG. 15A.

FIG. 15C is a diagrammatic view of another variant of the sixth structural selection of the present invention, as illustrated in FIG. 15A.

FIG. 15D is a diagram schematically showing a diagram for the seventh structural selection of the present invention, as illustrated in FIG. 15A.

FIG. 16A is a diagrammatic view of a diagram of an eighth structural selection of the invention taken along the second line XVI-XVI indicated in FIG. 9, as illustrated in FIG. 10.

FIG. 16B is a diagram schematically illustrating a diagram of a variant of the eighth structural selection of the present invention, as illustrated in FIG. 16A.

FIG. 16C is a diagrammatic view of a diagram of another variant of the eighth structural selection of the present invention, as illustrated in FIG. 16A.

FIG. 17A is a diagrammatic view of a ninth structural selection of the invention taken along the lines XVII-XVII indicated in FIG. 9, as illustrated in FIG. 10.

FIG. 17B is a diagram schematically illustrating a diagram of a first variant of the ninth structural selection of the present invention, as illustrated in FIG. 17A.

FIG. 17C is a diagram schematically illustrating a diagram for a second variant of the ninth structural selection of the present invention, as illustrated in FIG. 17A.

FIG. 17D is a diagram schematically illustrating a diagram of a third variant of the ninth structural selection of the present invention, as illustrated in FIG. 17A.

FIG. 17E is a diagrammatic view of a diagram of a fourth variant of the ninth structural selection of the present invention, as illustrated in FIG. 17A.

<Description of the Illustrated Embodiments>

The present invention provides a solution for attenuating noise generated in the region of the housing 1 described above, which is provided in the rear lower region of the cabinet 3 of the refrigeration plant (eg in the form of a refrigerator or freezer). .

The housing 1 is defined by a recess in the rear wall 3a of the cabinet 3 of the refrigeration plant.

As illustrated, the compressor 2 has an evaporation tray 4 dimensioned for receiving and storing water from the defrost process of the refrigeration system of the refrigeration plant, the evaporation tray 4 being It is attached to the sealed casing (2a) of the compressor (2) of the refrigeration system.

In this structural solution, placing the evaporation tray 4 on the casing 2a of the compressor 2 is to expose it to the heat generated by the compressor 2 during the first operation, thereby promoting the evaporation of the collected water. The evaporation tray 4 is supported by the compressor 2 by suitable means, such as glue, adhesive or the like, which is not a feature of the solution of the present invention.

As shown in the figure, in a possible configuration, the evaporation tray 4 is produced from a high-resistance plastic material, such as highly-resistant polypropylene, of which thawed water is required by the refrigeration system to which it is applied. It is injection molded into its final form with a bottom wall 4a which houses a peripheral wall 4b having a height sufficient to limit the collection amount. As a structural choice, the evaporation tray 4 is formed as a single piece.

The bottom wall 4a of the evaporation tray 4 has a lower recess (not shown), which is defined as an overall lower surface, dimensioned to be placed on a predetermined extension of the end face of the casing 2a of the compressor 2. Is provided. The lower recess installs and positions the evaporation tray 4 on the upper portion of the casing 2a of the compressor 2, increases the stability of positioning on the casing 2a, and the compressor 2 It is to be understood that in order to increase heat exchange with, it can be formed and dimensioned to follow the contour of the upper part of the casing 2a of the compressor 2.

According to the invention, noise attenuation in the housing 1 is obtained by providing a facility of the evaporation tray 10 having noise absorbing means arranged in the housing 1 towards the noise generating area, The noise absorbing means are dimensioned to define a predetermined reactive impedance and a predetermined dissipative impedance in the medium of the housing 1 for at least one determined specific frequency band or for all frequencies at which noise occurs. The noise absorbing means possessed by the evaporation tray 10 may take different structural forms within the concepts presented herein, some of which will be described below.

As described below, the invention allows attenuation of noise emitted by the compressor 2 mounted in the housing 1 of the refrigeration plant or by another source such as, for example, fans. Moreover, the noise absorbing means of the present invention can also be used to partially or partially cancel out the effect of resonances which occur in the housing 1 of the cabinet 3 of the refrigeration plant.

The evaporation tray 10 of the present invention provides a bottom wall 11 and a peripheral wall 12 arranged in a structure having a shape similar to that of the evaporation tray 4 of the known art. In the method of carrying out the invention, the noise absorbing means is provided in the evaporation tray 10 and at least one arranged along at least one extension of the bottom wall 11 and the peripheral wall 12 of the evaporation tray 10. A resonator conductor 20 of which the resonator conductor 20 arranged in the evaporation tray 10 has a first end 21 of the resonator conductor 20 generating noise in the housing 1. It is formed so as to face the area. Resonator conductor 20 also provides a second end 22 spaced at regular intervals away from the first end 21.

Although the object of the present invention can be achieved with one resonator conductor 20, the structural forms described and illustrated in FIGS. 4 to 14 are characterized by at least the bottom wall 11 and the peripheral wall 12. In one, there is provided an evaporation tray 10 having noise absorbing means having a plurality of resonator conductors 20, at least a portion of which provides the arrangement described above, wherein each first of each of the resonator conductors 20 is provided. The end 21 is arranged to face the noise generating area in the housing 1. Each resonator conductor 20 has a defined length and a determined diameter calculated to define a predetermined reactive impedance and a predetermined dispersive impedance within the medium of the housing 1 for at least one determined frequency band. Dimensioned to provide. The length of the resonator conductor 20 is calculated taking into account the frequency or frequency band at which it is desired to be attenuated, and the difference between the lengths of the resonator conductors 20 is to be considered for each case, i.e. of each housing 1. It depends on the attenuation and frequency band width required for the characteristic.

In accordance with the present invention, at least a portion of the resonator conductors 20 in any of the structures described herein can provide a constant or varying cross section along their length, the contour and behavior of the cross section being to be obtained. Function as damping effect, and facilility for forming them. Some of the possible cross sections within the preferred damping concept are, as in the case of fibrous material pores, in terms of deformation: cylindrical, conical, exponential or stepped, and in terms of contours. : Regular or even irregular such as rectangular, circular, polygonal.

In order to achieve the desired effect, the resonator conductor 20 must be tuned at a frequency or frequency band that provides the desired level of control, which tuning, whether closed or open, of the second end of each resonator conductor 20 Obtained through the length and shape of the distal end of (22).

In a preferred form of the invention, the second end 22 of each resonator conductor 20 is closed. However, according to the invention, the second end 22 can be open, and the condition is such as the tubular sleeve 30 or the peripheral ring 40 to be described in and / or below the evaporation tray 10. In other bodies supporting such resonator conductors 20 are also defined as the function of the arrangement of each resonator conductor 20 and the desired damping characteristics.

The quantity of resonator conductor 20 is calculated taking into account its tuning at different frequencies in order to offset the noise radiated by the compressor 2 at several different frequencies. Such frequencies may be separated or closed to form an attenuation band.

The evaporation tray 10 is one of at least one inner and outer surface of its bottom wall 11 and its peripheral wall 12, as illustrated, for example, in FIGS. 4, 4A, 7 and 8. By being embedded therein, in the form of a resonator conductor 20, in this specification, each resonator conductor 20 has a noise absorbing means, or each resonator conductor 20 is also evaporated, as illustrated in FIGS. 5 and 6. It is formed on either side in the thickness of the bottom wall 11 or the peripheral wall 12 (or both) of the tray 10.

Each resonator conductor 20 is an adjacent surface portion of each bottom wall 11 and / or peripheral wall 12 of the evaporation tray 10 providing a resonator conductor 20, for example the resonator. In the case of defining at least a portion of the length of the conductor 20 as a single piece, as in the case where the resonator conductor 20 is formed partially or at the thickness of each wall of the evaporation tray 10 (Fig. 11 to 14), as a whole (FIG. 4, FIG. 4A, FIG. 7 and FIG. 8). In this case, the part which complements the cross section of the resonator conductor 20 is mounted by using the tubular sleeve 30, the peripheral ring 40, or also attached to the resonator conductor 20 formed in the evaporation tray 10, said Each resonator conductor 20 complements the peripheral contour of the resonator conductor 20, which occurs in its closed cross section, along at least the length of the resonator conductor 20 for attenuating noise in the designed frequency band. By coupling the complementary member to each resonator conductor 20 by appropriate means, it can be defined by one of the structural forms described below.

Using the resonator conductor 20, in view of the distribution of the noise to be attenuated in the housing 1 in order to construct the noise absorbing means herein, the present invention provides for the differentiation of the resonator conductor 20 in the evaporation tray 10. With the arrangement of the arrangement and the quantity of resonator conductors 20 of the same arrangement, the same dimensions and arrangement characteristics of the evaporation tray 10 are such that the highest noise is detected in the housing 1 and that it will be attenuated in this region. It is calculated as a function of the frequency band. In the method of carrying out the invention, the resonator conductor 20 provides at least one of the diameter and length parameters having the same value. However, it should be understood that the dimensions of the resonator conductor 20 may be the same or different depending on the result of the intended attenuation. Thus, if it is desirable to widen the frequency band to be attenuated, such dimensions are different, although only slightly different from each other. If the attenuation should be greater in the intended narrower frequency band, the resonator conductor 20 should have the same dimensions.

Resonator conductor 20 is supported by evaporation tray 10 to prevent or attenuate the transmission of sound waves and to reflect or disperse these sound waves. Such resonator conductor 20 changes the impedance locally. When applied in the region of maximum modal pressure, the resonator conductor 20 acts to withdraw (dissipate) energy from the region of the housing 1, reducing the effect of resonance. In a general manner, the resonator conductor 20 increases the acoustic attenuation of the sound in the frequency at which they are tuned.

The evaporation tray 10 is directly defined, at least in part, at least one of the bottom wall 11 and the peripheral wall 12, as described above, or through the tubular sleeve 30 or the peripheral ring 40. It should be understood that the resonator conductor 20 can be supported.

As a function of setting the dimensions of the housing 1 of the cabinet 3 of the refrigerating plant, the resonator conductor 20 preferably evaporates for all possible forms in which the evaporation tray 10 supports the resonator conductor 20. In maximum agreement with the upper edge of the tray 10, they should have their ends disposed above on the evaporation tray 10 without relatively protruding from the upper edge of the evaporation tray 10. The end of each resonator conductor 20 disposed below on the evaporation tray 10 may be positioned beyond the range of the lower contour of the peripheral wall 12 of the evaporation tray 10, the protruding position being refrigerated It does not interfere with the arrangement of the evaporation tray 10 on the compressor 1, nor does it interfere with the dimensions and operation of the refrigeration compressor 1.

In a structure in which the evaporation tray 10 supports the tubular sleeve 30, the tubular sleeve 30 has one of the bottom wall 11 and the peripheral wall 12 of the evaporation tray 10 therein or external thereto. At least one resonator provided adjacent and disposed around the entire peripheral contour of the adjacent bottom wall 11 or peripheral wall 12 and defined by the components of the evaporation tray 10 and the tubular sleeve 30. The cross section of the conductor is partially defined in each of the parts.

The tubular sleeve 30 surrounds at least a portion of the longitudinal extension of the wall of the evaporation tray 10 supporting it, each resonator conductor 20 of the tubular sleeve 30 and the wall of the evaporation tray 10. It has a portion of the cross section defined opposite one of the adjacent surfaces.

In this method of carrying out the invention, at least a portion of the resonator conductor 20 provides at least a portion of their length defined from the complementation of the two components: one component is defined at the wall of the evaporation tray 10 and The other part is defined by the tubular sleeve 30 supported by the evaporation tray 10.

In the illustrated structure, the tubular sleeve 30 provides a predetermined wall thickness predefined as a function of structural strength, the cross section of the conductor which it defines in part, wherein the tubular sleeve 30 is an adjacent surface of the evaporation tray 10. It provides an inner surface facing away, the contour and cross section of the resonator conductor 20 being defined in part at each of the adjacent opposing surfaces of the tubular sleeve 30 and the adjacent wall of the evaporation tray 10.

According to the invention, at least one of the resonator conductors 20, in the form of a vertical or curved line, has a peripheral wall 12 and / or a tubular sleeve of each bottom wall 11 and / or evaporation tray 10. At least a portion of its length extending along the extension of 30). In the method of carrying out the invention, the resonator conductors 20 are formed with at least a portion of their extensions perpendicular. In the method of carrying out the invention, the resonator conductors 20 are formed vertically in at least part of their extensions.

In a structural variant of the invention, at least two resonator conductors 20 are parallel to each other or parallel to each other in sets of resonator conductors 20, the resonator conductors 20 being evaporated tray 10 and And / or arranged vertically or horizontally in each portion of the tubular sleeve 30. The arrangement of at least a portion of the resonator conductor 20 may also be inclined with respect to the wall of the evaporation tray 10 and / or the longitudinal length of the tubular sleeve 30 provided with at least a portion of the resonator conductor 20. The arrangement is for example formed diagonally with respect to the wall on which the resonator conductor 20 is provided. These structural arrangements with different inclination of the resonator conductor 20 with respect to the adjacent wall of the evaporation tray 10 also allow the resonator conductor 20 to be partially supported by the tubular sleeve 30 or by the peripheral ring 40. Or in a fully supported structure.

For example, the shape of the resonator conductor 20 that is parallel, horizontal, vertical, inclined, straight, curved, or a combination thereof requires that the resonator conductor 20 be carried out within the housing 1. It depends on the desired attenuation effect and / or on the direction of the noise generating region of at least one first end of the resonator conductor 20.

In the illustrated embodiment of FIG. 4A, the resonator conductor 20 is disposed horizontally on the peripheral wall 12 of the evaporation tray 10, and the others are disposed vertically. In the part supporting them, it should be understood that the arrangement of the resonator conductors 20 is limited as a function of the necessary orientation of the resonator conductors 20 relative to the area of the housing 1 where the noise is attenuated. Thus, a possible structure with bundles of resonator conductors 20 arranged in different directions on the evaporation tray 10 and / or tubular sleeve 30 is also possible for each bundle of resonator conductors of the resonator conductor 20. The first end 21 of 20 is defined to be oriented to the determined area of the housing 1 to be attenuated, wherein the bundles of the resonator conductor 20 are each directed towards the bundle of the first end 21. The dimension is set as a function of the frequency band to be attenuated in the region.

The arrangement of the resonator conductors 20 of the present invention tunes each resonator conductor at a different frequency, but in order to result in a wider frequency band to be attenuated by the arrangement of the resonator conductors 20, eg another resonator conductor 20, eg For example, it is located very close to that of the adjacent resonator conductor 20.

In a structural form in which resonator conductors 20 are at least partially supported by adjacent surface portions of each wall of evaporation tray 10, these resonator conductors 20 attach to the wall surface portions of evaporation tray 10. Or a pipe may define a portion of the cross section of the resonator conductor 20, while the other portion is in the portions of the evaporation tray 10 and the tubular sleeve 30. In order to achieve a peripheral contour of each resonator conductor 20 defined by it, it is defined by adjacent opposing surface portions of the tubular sleeve 30 disposed on the evaporation tray 10. In this structural choice, each resonator conductor 20 is defined by the recess described above, formed in at least one of the opposing surfaces of the evaporation tray 10 and the tubular sleeve 30.

In the structural selection illustrated in FIGS. 4 to 6, the resonator conductor 20 is defined in a single piece with the evaporation tray 10, for example during the formation of the evaporation tray 10, the resonator conductor ( 20 is previously defined in the mold forming the evaporation tray 10. However, the resonator conductor 20 is provided after formation of the evaporation tray 10, for example by mounting a plurality of pipes, each defining a resonator conductor 20, for at least a portion of its peripheral wall 12. Can be. In this structural variant, the peripheral wall 12 may be hollow in which the resonator conductor 20 is received and / or maintained, or supports adjacent peripheral edge portions of each resonator conductor 20 and evaporates the evaporation. It may support the entirety of the peripheral contour of the peripheral wall 12 of the tray 10 or the peripheral flange peripheral portion.

In the structural variant illustrated in FIGS. 4, 4 a, 7 and 8, the resonator conductor 20 is, as described above, for example, during the formation of the evaporation tray 10, with the evaporation tray 10. Together provided as a single piece, or the resonator conductor 20 is attached to the outer surface of the peripheral wall 12 by suitable means. The structural form of the evaporation tray 10 incorporating the resonator conductor 20 provides the advantage of facilitating the formation of the resonator conductor 20 at a reduced cost, while mounting and / or attaching the evaporation tray. The structural form supporting the resonator conductor 20 at 10 is for a determined area of the housing 1 that is likely to have a higher amount of noise to be attenuated, and to one or more frequency bands to be locally attenuated. It offers the advantage of higher flexibility in the preferred form of the resonator arrangement described above. Another advantage of this structure is that such an arrangement can also be provided in an already commercially available evaporation tray.

In another structural selection of the present invention, described below, the evaporation tray 10 is configured to resonate the resonator conductor 20 entirely (at least in part around the contour of its peripheral wall 12) (FIGS. 9, 9A and Resonator conductor 20 is supported by mounting a tubular sleeve 30, which is defined in FIG. 10 or in part (FIGS. 11-14).

In the structural form illustrated in FIG. 9A, the tubular sleeve 30 has an inner surface facing the outer surface of the peripheral wall 12 of the evaporation tray 10 in which the tubular sleeve 30 is provided adjacent thereto. So that it is mounted around the entire contour of the adjacent peripheral wall 12 of the evaporation tray 10. In this structure, the tubular sleeve 30 coincides with that of the peripheral wall 12 of the evaporation tray 10, or in accordance with the radial gap already defined in this design, so as to be firmly installed around it. It is formed to provide a profile.

In the structure illustrated in FIG. 9, the evaporation tray 10 is a male-female type fittings, clamps, adhesive provided on the evaporation tray 10 and the portions of the tubular sleeve 30. Supported by such suitable means, or other suitable means, around the tubular sleeve 30 attached to the evaporation tray 10, a portion of the contour of the peripheral wall 12 thereof. In this illustrated structure, the fixing of the tubular sleeve 30 to the evaporation tray 10 is achieved by installing an inner flange (not shown) against the adjacent edge of the peripheral wall 12 of the evaporation tray 10. The installation is maintained through such suitable fastening means as mechanical interference, clamps, screws and the like. The tubular sleeve 30 provides an upper flange 30a that peripherally defines the edge of the tubular sleeve 30 externally to the resonator conductor 20.

In the structural selections illustrated in FIGS. 11-14, the peripheral contours of each resonator conductor 20 define the cross section of the tubular sleeve 30 such that the complementary relationship of the contours defines the cross section of each resonator conductor 20. It is defined in part by adjacent opposing surfaces and in part by the peripheral wall 12 of the evaporation tray 10.

In the structural variant illustrated in FIGS. 11 and 12, the tubular sleeve 30 is each resonator conductor, for example in the form of a recess 33 defining an arcuate portion of each resonator conductor 20. It is formed to define a portion of (20), and adjacent end surfaces of the peripheral wall 12 of the evaporation tray 10 define a contour enclosed by a straight line for each resonator conductor 20. In this structural variant, the evaporation tray 10 provides the same structure as a conventional evaporation tray 4, with the volume of each resonator conductor 20 defined by the shape of the tubular sleeve 30. Although a structure is illustrated in which the contour of each resonator conductor 20 is arcuate, it should be understood that other forms of contour are possible within the concepts provided herein.

In this structure, the tubular sleeve 30 is provided with an arcuate recess 33, for example, each defining a portion of each resonator conductor 20.

Each recess 33 is provided along the length of each peripheral wall 12 of the evaporation tray 10, or with respect to the plane of the rear wall of the cabinet 3 of the refrigeration plant in which the housing 1 is defined. Can be tilted.

In the structural variant illustrated in FIGS. 13 and 14, the inner surface of the tubular sleeve 30 and the outer surface of the evaporation tray 10 are formed to define a portion of the contour of each resonator conductor. In this structure, each portion of the evaporation tray 10 and the tubular sleeve 30 is provided with respective recesses 13, 33, as described above, which is each of the contours of the resonator conductor 20. Qualify part. In this structural choice, each recess 13, 33 defines a portion of the arcuate contour of each resonator conductor 20.

The resonator conductor 20 may only be provided in a portion of the extension of the evaporator tray 10 and / or the peripheral wall 12 of the tubular sleeve 30, and the positioning of the resonator conductor 20 may also be noise or determined desired. It should be understood that it can be defined in a given direction for specific attenuation of the frequency band. This structure allows for a specific controlled arrangement of the resonator conductor 20 in the region of the housing 1, depending on the detected need.

According to the invention, at least one of the bottom wall 11 and parts of the peripheral wall 12 of the evaporation tray 10 of the tubular sleeve 30 and the at least one resonator conductor 20, this defines small holes. So long as it can also be defined in porous or fibrous materials (FIG. 15D). In this solution, the defined part of the porous material can be obtained, for example, by direct injection in the porous material. In the case of the porous evaporation tray 10, it is injected in a single piece, for example in a polymer or fibrous material. In a structure in which the evaporation tray 10 defines a single piece with a resonator conductor 20, the resonator conductor 20 can also be obtained during the injection of the porous material, which also defines the noise absorbing means of the present invention. .

However, it should be understood that the desired noise damping effect can be obtained with at least one of the above parts coated with a porous material (FIGS. 15A-15C). The coating can be obtained, for example, on a piece in the form of a plate of porous or fibrous material added to each part by suitable fixing means, the coating material being limited as a function of the area providing the noise to be attenuated. It can be arranged in this part in position and structure.

Some of the above-mentioned parts may be coated with a porous material, while others define, for at least one predetermined frequency band, a predetermined reactive impedance and / or a predetermined dispersive impedance in the medium of the housing 1. It can be provided directly from the porous material having the desired noise absorption properties.

In order to have the desired effect, the part provided with the small holes must be manufactured or coated so that the holes of the surface in contact with the water provided in the evaporation tray 10 are closed, while the opposite surface has open holes. Small holes are obtained by a specific manufacturing process, for example, must have dimensions greater than 20 micrometers.

In the process of carrying out the invention, the porous material contemplated is defined by such materials as polystyrene polymers, polystyrene and metallic materials, for example aluminum. In a structure using a non-metallic porous material, at least some of the small holes of the material are open. However, in the structure of the metallic porous material, the small holes of the material are closed.

In another structural form of the invention, the noise absorbing means has a peripheral ring 40 supported by the evaporation tray 10 either inward or outward with respect to its peripheral wall 12 and of the type already described above. It is provided with at least one resonator conductor 20. In the structures illustrated in FIGS. 9, 9A, and 17A-17E, the peripheral ring 40 supports a number of resonator conductors 20.

In accordance with the present invention, the peripheral ring 40 provides a predetermined predetermined thickness at which a portion of the resonator conductor 20 supported by the peripheral ring 40 can be formed. In the method of carrying out the invention, the peripheral ring 40 is provided with the evaporation tray 10 in its injection process. In this process, the resonator conductors 20 can also be provided by injection all in a single piece. However, each portion of the evaporation tray 10, the peripheral ring 40 and the resonator conductor 20 may be obtained separately by injection or other suitable technique, or may be a single piece with portions defined by the same mold and material. It is to be understood that the pieces can be formed and the other pieces later joined by appropriate means.

The structure of the peripheral ring 40 is, for example, around its peripheral wall 12, after its acquisition or after mounting of the peripheral ring 40 on the evaporation tray 10, the peripheral ring 40. Permits to form an array of resonator conductors 20 mounted in the array. The resonator conductor 20 in the peripheral ring 40 as well as the installation and support of the peripheral ring 40 to the evaporation tray 10 can be, for example, adhesive, clamps, welding, mechanical interference. ), And the like.

In the illustrated structural form, the peripheral ring 40 is formed separately from the evaporation tray 10, and then of the peripheral ring 40 defining cradles to receive a plurality of resonator conductors 20. At least a portion is mounted to the evaporation tray 10, for example, adjacent to the upper edge of the peripheral wall 12, outside the peripheral wall 12 of the evaporation tray 10. In this structure, the peripheral ring 40 supports each resonator conductor 20 at the top. However, it should be understood that this structure is not limitative, but merely a method of carrying out the invention illustrated herein. In another structure, the peripheral ring 40 is provided centrally around the peripheral wall 12 of the evaporation tray 10, and the resonator conductor 20 is in relation to the upper edge of the evaporation tray 10, at the top thereof. Depending on the preferred positioning of the end and the length of the resonator conductor 20, it is supported by the peripheral ring 40 supported at the center or at the top.

In another method of carrying out this solution, the peripheral ring 40 is defined, for example, from the peripheral flange 10a as a single piece with the evaporation tray 10, and the peripheral wall of the evaporation tray 10 ( Protrude radially from 12). In this structural choice, the peripheral flange 10a projects outwardly and upwardly from the peripheral wall 12. Although not illustrated, the peripheral contour of each resonator conductor 20 may be partly defined by the peripheral ring 40 and partly by the peripheral wall 12 of the evaporation tray 10, and thus the contour. Their complementary relationship defines the cross section of each resonator conductor 20. For this structure, the peripheral ring 40 is each resonator conductor 20 in the form of a recess, as previously described above, which defines, for example, the arcuate portion of each resonator conductor 20. Is defined to define a portion of the contour.

As already described above for the structure with the tubular sleeve 30, the solution for providing the peripheral ring 40 can be applied to an evaporation tray having a conventional shape and already commercialized, for the resonator conductor 20 Structural shapes are also those previously described. In this case, the peripheral ring 40 has here a fully matched resonator conductor 20, or in case of partial matching, each resonator conductor 20 is a peripheral wall 12 of the evaporation tray 10. Has a portion of its contour defined by the adjacent and opposing outer surface portions of the &lt; RTI ID = 0.0 &gt;

Like the tubular sleeve 30, the peripheral ring 40 is supported on the evaporation tray 10 by such suitable supporting means such as adhesives, welding, clamps, pins, mechanical interference, and the like.

According to the invention, at least one of the bottom wall 11 of the evaporation tray 10 of the peripheral ring 40 and portions of the peripheral wall 12 and at least one resonator conductor 20 are defined by a porous material. However, it should be understood that the desired noise damping effect can be obtained in at least one of the above parts coated with the porous material. Some of the above-mentioned parts may be coated with a porous material, while others may be produced directly from the porous material which provides the desired noise absorption properties for at least one predetermined frequency band, and in the medium of the housing 1 It should further be considered that it may define a given reactive impedance and / or a given dispersible impedance.

In the process of carrying out the invention, the porous materials considered are defined by polystyrene polymers, polypropylene and metallic materials, for example aluminum. In a structure using a nonmetallic porous material, at least some of the small holes of the material can be opened. However, in the structure using the metallic porous material, the small holes of the material are closed.

In another method of carrying out the invention, the noise absorbing means is defined by a plurality of small holes 50, each small hole 50 having a noise generating area of the housing 1 in which the evaporation tray 10 is arranged. A first end portion 51 open toward and a second end portion 52 spaced away from the first end portion 51 in an opposite direction, each small hole 50 in the predetermined frequency band. With respect, the dimensions are set to provide a predetermined inner portion 5 calculated to define a predetermined reactive impedance and a predetermined dispersible impedance in the medium of the housing 1.

The eyelets 50 are limited to a porous material or form at least a portion of the evaporation tray 10, for example at least one of the peripheral wall 12 and the bottom wall 11 of the evaporation tray 10. For example at least one of the peripheral wall 12 and the bottom wall 11 of the evaporation tray 10, the porous material being a material selected from polystyrene polymer, polypropylene and metallic material, for example aluminum. Is made.

However, a desirable noise attenuation effect can be obtained in some of the above-mentioned parts coated with a porous material, while others, for at least one predetermined frequency band, have a desired reactive impedance and / or at the media of the housing 1. Or it can be produced directly from a porous material that provides the desired noise absorption properties that limit the desired dispersion impedance.

In a structure using a nonmetallic porous material, at least a portion of the small holes of the material can be opened. However, in a structure using a metallic porous material, the small holes of the material are closed.

Although only a portion of the above structures are illustrated, it should be understood that the above concept is not limited to the above examples.

One of the advantages of the present invention is to increase the attenuation in the region of the housing 1 of the cabinet 3 of the refrigeration plant at discrete frequencies or frequency bands at which defects are detected.

The arrangement of the resonator conductor 20 of the present invention is achieved by means of a compressor and a fan mounted in the housing 1 of the refrigeration plant (as a result of the blade frequency passage and turbulence between the air and these blades) and known techniques. With reduced cost in connection with this, it allows to attenuate the noise formed by the refrigeration system, which further attenuates resonances (and their negative effects) which may be present in the housing 1.

The structure in which the resonator conductor 20 is provided as a single piece with the evaporation tray 10 further provides the advantage of not adding parts or other materials in the housing 1. In this configuration, the provision of a resonator conductor 20 that opens each second end also allows each of the resonator conductors 20 to act as thawed water accumulators.

Resonator conductor 20 allows using various frequencies, or other lengths that allow attenuation of a wider band. The diameter of each resonator conductor 20 and the shape of each cross section can be selected according to the manufacturing process and the need for damping and dimensions. Definitions by diameters up to 1 millimeter or larger define the damping action of the resonator conductor between the overall dispersive (smaller diameter) and the overall reactive (larger diameter).

The resonator conductor 20 can be distributed along the contour of the peripheral wall 12, so that its length is distributed stepwise in a direction to attenuate the determined or any frequency band, if no particular frequency is attenuated, The frequency is also optionally present in the housing 1.

Although not illustrated, the resulting noise reduction can range from 5 dB to 20 dB, in tuning frequency, in the resonator arrangement of the present invention.

While certain features of the invention have been described with reference to the accompanying drawings for convenience only, each feature may be combined with other features in accordance with the invention. Other embodiments are recognized by those skilled in the art, which are intended to be included within the scope of the claims. Accordingly, the above description should be construed as illustrative of the scope of the invention and not of limitation. All such obvious changes and modifications fall within the scope of the patent as defined by the appended claims.

Claims (47)

A housing (3) defining a housing (1), having a cabinet (3) supported in the housing (1), a compressor (2) providing a sealed casing (2a), and a thawed water evaporation tray (10); The water evaporation tray 10 has a bottom wall 11 installed on the upper portion of the casing 2a of the compressor 2; And a resonator arrangement for a cabinet of a refrigeration plant having a peripheral wall 12 protruding upward from the bottom wall 11, At least one of the peripheral wall 12 and the bottom wall 11 of the evaporation tray 10 supports the noise absorbing means 20, 30, 40, 50 toward the noise generating area in the housing 1, and at a predetermined frequency A resonator arrangement for a cabinet in a refrigeration plant, characterized in that for the band, dimensions are set to define a predetermined reactive impedance and a predetermined dispersible impedance within the medium of the housing (1). The method of claim 1, The resonator arrangement for a cabinet of a refrigerating installation, characterized in that the noise absorbing means comprises at least one resonator conductor (20) extending along an extension of each wall (11, 12) of the evaporation tray (10). The method of claim 2, Each resonator conductor 20 provides a first end 21 that opens toward a noise generating area in the housing 10, and a second end 22 spaced in an opposite direction from the first end 21. Each resonator conductor 20 is dimensioned to provide, for a predetermined frequency band, a predetermined length and predetermined diameter calculated to define a predetermined reactive impedance and a predetermined dispersible impedance within the medium of the housing 1. Resonator arrangement for the cabinet of the refrigeration plant, characterized in that. The method of claim 3, At least one resonator conductor (20) is formed at least in part in a single piece together with adjacent surface portions of each wall (11, 12) of the evaporation tray (10). The method of claim 4, wherein At least a portion of the length of each resonator conductor (20) is formed at the thickness of each wall (11, 12) of the evaporation tray (10). The method of claim 5, The evaporation tray 10 supports the tubular sleeve 30 and the cross section of the resonator conductor 20 is defined in part at each of the portions of the evaporation tray 10 and the tubular sleeve 30 of the refrigeration plant. Resonator array for the cabinet. The method of claim 6, The tubular sleeve 30 provides a surface facing the adjacent wall surfaces 11, 12 of the evaporation tray 10, with each resonator conductor 20 having an adjacent wall 11, 12 of the evaporation tray 10. A resonator arrangement for a cabinet of a refrigeration plant, characterized by a recess (13, 33) formed in at least one opposing surface of the tubular sleeve (30). The method of claim 7, wherein The tubular sleeve (30) occupies one of the inner and outer positions with respect to the peripheral wall (12) of the evaporation tray (10). The method of claim 8, At least one of the portions of the peripheral wall 12 and the bottom wall 11 of the evaporation tray 10 of the tubular sleeve 30 and at least one resonator conductor 20 is characterized in that it is defined by a porous or fibrous material. Resonator arrangement for cabinets in refrigeration plants. The method of claim 8, At least one of the portions of the peripheral wall 12 and the bottom wall 11 of the evaporation tray 10 of the tubular sleeve 30 and at least one resonator conductor is characterized in that it is coated with a porous or fibrous material. Resonator array for the cabinet. The method according to any one of claims 9 and 10, The porous material is a resonator array for a cabinet of a refrigeration plant, characterized in that it is defined by a material selected from polystyrene polymer, polypropylene and metallic material. The method of claim 11, A resonator arrangement for a cabinet in a refrigeration plant, characterized in that the porous material provides a plurality of closed small holes (50). The method according to any one of claims 9 and 10, The porous material is defined by a material selected from polystyrene polymer and polypropylene, the porous material providing a plurality of small holes 50, wherein at least a portion of the small holes 50 are opened. Resonator arrangement for the cabinet of the installation. The method of claim 3, Evaporator tray 10 is a resonator arrangement for a cabinet of a refrigeration plant, characterized in that it supports a peripheral ring (40) provided with a plurality of resonator conductors (20). The method of claim 14, The peripheral ring (40) has a predetermined thickness, wherein at least a portion of the resonator conductor (20) is formed in the wall thickness of the peripheral ring (40). The method of claim 14, A peripheral ring (40) occupies one of the inner and outer positions with respect to the peripheral wall (12) of the evaporation tray (10). The method of claim 16, At least one of the portions of the peripheral wall 12 and the bottom wall 11 of the evaporation tray 10 of the peripheral ring 40 and the at least one resonator conductor 20 are characterized in that they are defined by a porous or fibrous material. Resonator arrangement for cabinets in refrigeration plants. The method of claim 16, At least one of the portions of the peripheral wall 12 and the bottom wall 11 of the evaporation tray 10 of the peripheral ring 40 and at least one resonator conductor 20 is characterized in that it is coated with a porous or fibrous material Resonator arrangement for cabinets in refrigeration plants. The method according to any one of claims 17 and 18, The porous material is a resonator array for a cabinet of a refrigeration plant, characterized in that it is defined by a material selected from polystyrene polymer, polypropylene and metallic material. The method of claim 19, A resonator arrangement for a cabinet in a refrigeration plant, characterized in that the porous material provides a plurality of closed small holes (50). The method according to any one of claims 17 and 18, The porous material is defined by a material selected from polystyrene polymer and polypropylene, and resonator arrangement for a cabinet of a refrigeration plant, characterized in opening at least a portion of the small holes. The method of claim 3, The resonator conductor 20 is a resonator arrangement for a cabinet of a refrigeration plant, characterized in that at least a portion of their extension is formed vertically. The method of claim 22, Resonator arrangement for a cabinet of a refrigeration plant, characterized in that at least two resonator conductors 20 are parallel to each other. The method of claim 22, Resonator arrangement for a cabinet of a refrigeration plant, characterized in that at least one of the resonator conductors (20) is vertical. The method of claim 22, Resonator arrangement for a cabinet of a refrigeration plant, characterized in that at least one of the resonator conductors (20) is horizontal. The method of claim 22, The resonator conductor (20) is a resonator arrangement for a cabinet of a refrigeration plant, characterized in that it is provided at an angle with respect to the axis of the wall on which they are provided. The method of claim 3, The resonator arrangement for a cabinet of a refrigeration plant, characterized in that the second end (22) of each resonator conductor (20) is closed. The method of claim 3, Resonator arrangement for a cabinet of a refrigeration plant, characterized in that at least a portion of the resonator conductors 20 provide a constant cross section along their length. The method of claim 3, Resonator arrangement for a cabinet of a refrigeration plant, characterized in that at least a portion of the resonator conductors (20) provide cross sections that vary along their length. The method of claim 29, Resonator arrangement for a cabinet of a refrigeration plant, characterized in that at least a portion of the resonator conductor (20) provides a stepped cross section. The method of claim 29, Resonator arrangement for a cabinet of a refrigeration plant, characterized in that at least a portion of the resonator conductor (20) provides a conical cross section. The method of claim 29, Resonator arrangement for a cabinet of a refrigeration plant, characterized in that at least a portion of the resonator conductor (20) provides an exponential cross-section. The method according to any one of claims 28 to 32, A resonator arrangement for a cabinet of a refrigeration plant, characterized in that at least a portion of the resonator conductor 20 has one of circular and polygonal cross sections. The method of claim 1, Resonator arrangement for a cabinet of a refrigeration plant, characterized in that the noise absorbing means provide a plurality of small holes (50). The method of claim 34, wherein Each of the small holes 50 has a first end portion 51 which opens in the housing 1 toward the noise generating region and a second end portion 52 which is spaced in an opposite direction from the first end 21. Each eyelet 50 is dimensioned to provide a predetermined inner portion calculated to define a predetermined reactive impedance and a predetermined dispersive impedance within the media of the housing 1 for a predetermined frequency band. Resonator arrangement for the cabinet of the refrigeration plant, characterized in that. The method of claim 34, wherein Resonator arrangement for a cabinet of a refrigeration plant, characterized in that at least one of the peripheral wall (12) and the bottom wall (11) of the evaporation tray (10) is defined by a porous or fibrous material. The method of claim 34, wherein Resonator arrangement for a cabinet of a refrigeration plant, characterized in that at least one of the peripheral wall (12) and the bottom wall (11) of the evaporation tray (10) is coated with a porous or fibrous material. 38. A compound according to any one of claims 36 and 37, The porous material is a resonator array for a cabinet of a refrigeration plant, characterized in that it is defined by a material selected from polystyrene polymer, polypropylene and metallic material. The method of claim 38, Resonator arrangement for a cabinet of a refrigeration plant, characterized in that the small holes (50) are closed. 38. A compound according to any one of claims 36 and 37, The porous material is defined by a material selected from polystyrene polymer and polypropylene, and resonator arrangement for a cabinet of a refrigeration plant, characterized in that opening at least a portion of the small holes (50). The method of claim 1, The noise absorbing means is characterized in that it comprises at least one resonator conductor 20 which extends along the extension of each wall 11, 12 of the evaporation tray 10 and provides a plurality of small holes 50. Resonator arrangement for cabinets in refrigeration plants. The method of claim 41, wherein Each resonator conductor 20 provides a first end 21 that opens in the housing 1 toward the noise generating area and a second end 22 spaced opposite from the first end 21. Each resonator conductor 20 is dimensioned to provide, for a predetermined frequency band, a predetermined length and predetermined diameter calculated to define a predetermined reactive impedance and a predetermined dispersible impedance within the medium of the housing 1. Resonator arrangement for the cabinet of the refrigeration plant, characterized in that set. The method of claim 41, wherein Resonator for a cabinet of a refrigeration plant, characterized in that at least one of the portions of the peripheral wall 12 and the bottom wall 11 of the evaporation tray 10 and at least one resonator conductor 20 are defined by a porous or fibrous material. Arrangement. The method of claim 41, wherein Resonator for a cabinet of a refrigeration plant, characterized in that at least one of the peripheral wall 12 and parts of the bottom wall 11 and at least one resonator conductor 20 of the evaporation tray 10 is coated with a porous or fibrous material. Arrangement. The method according to any one of claims 42 and 43, The porous material is a resonator array for a cabinet of a refrigeration plant, characterized in that it is defined by a material selected from polystyrene polymer, polypropylene and metallic material. The method of claim 44, A resonator arrangement for a cabinet in a refrigeration plant, characterized in that the porous material provides a plurality of closed small holes (50). The method according to any one of claims 42 and 43, The porous material is defined by a material selected from polystyrene polymer and polypropylene, and resonator arrangement for a cabinet of a refrigeration plant, characterized in that opening at least a portion of the small holes (50).

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