CN216381997U - Silencer for air inlet of fan - Google Patents

Abstract

The utility model discloses a silencer for an air inlet of a fan, which comprises a shell and a silencing structure arranged in the shell, wherein the silencing structure comprises a primary silencing body, a secondary silencing body and a tertiary silencing body, a silencing layer is embedded in the inner wall of the shell, the primary silencing body is provided with an inwards concave conical surface facing the air inlet, and the side surfaces of the secondary silencing body facing the air inlet and the air outlet are outwards convex conical surfaces. The utility model adopts multi-stage silencer layers to carry out silencing, and the effect is good; the primary noise reduction body firstly carries out primary noise reduction on noise, the periphery of the primary noise reduction body is thick, the middle of the primary noise reduction body is thin, and the concave conical surface gathers the noise in the middle; get into the second grade amortization body, second grade amortization body both ends are little, and the centre is big, and both sides terminal surface is conical, and the noise gathering is at second grade amortization body middle part, reduces the noise by a wide margin, comes the third grade amortization body at last, and is similar with the first grade amortization body, carries out the last elimination to the noise, and after tertiary elimination, the noise reduces by a wide margin.

Description

Silencer for air inlet of fan

Technical Field

The utility model belongs to the technical field of noise elimination, and particularly relates to a silencer for an air inlet of a fan.

Background

The fan increases the gas pressure and discharges the gas by means of the input mechanical energy. Fans are widely used in ventilation, dust extraction and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and draught of boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household appliance equipment, and the like.

However, the fan generates considerable noise during high-speed operation, and the noise interferes with normal work and rest of people. Various silencers are produced in the market, most of the silencers adopt honeycomb built-in silencers for silencing operation, and the influence of the shape of the silencers on the silencing effect is ignored.

SUMMERY OF THE UTILITY MODEL

The utility model provides a silencer for an air inlet of a fan, aiming at the current defects.

In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:

the utility model provides a fan air intake muffler, its characterized in that includes the casing and embeds noise cancelling structure in the casing, noise cancelling structure includes the one-level amortization body, second grade amortization body and the tertiary amortization body that set gradually from the air intake to the air outlet direction, shells inner wall inlays establishes the amortization layer, the one-level amortization body has the orientation the indent circular conical surface of air intake direction, the second grade amortization body orientation the air intake with the side of air outlet is the evagination circular conical surface, the tertiary amortization body with the one-level amortization body about second grade amortization body symmetry sets up.

Preferably, the shell is arranged in two halves and is connected through clamping bands arranged at two ends.

Preferably, the first-stage, second-stage and third-stage muffling bodies are connected with each other, at least one coaxial muffling hole is coaxially arranged among the first-stage, second-stage and third-stage muffling bodies, and a supporting pipe is arranged in the coaxial muffling hole in a penetrating mode.

Preferably, the coaxial muffling hole is arranged on the center line of the muffling structure.

Preferably, the support tube is provided with small holes on the periphery.

Preferably, the side surfaces of the first-level silencing body and the third-level silencing body facing the second-level silencing body are vertical surfaces, and one end of the second-level silencing body on the same side abuts against the center of the vertical surface.

Preferably, the structure is small at two ends and large in the middle.

Preferably, a filter screen is arranged at the air inlet.

The technical scheme can obtain the following beneficial effects:

the utility model adopts multi-stage silencer layers to carry out silencing, and the effect is good; the primary noise reduction body firstly carries out primary noise reduction on noise, the periphery of the primary noise reduction body is thick, the middle of the primary noise reduction body is thin, and the concave conical surface gathers the noise in the middle; get into the second grade amortization body, second grade amortization body both ends are little, and the centre is big, and both sides terminal surface is conical, and the noise gathering is at second grade amortization body middle part, reduces the noise by a wide margin, comes the third grade amortization body at last, and is similar with the first grade amortization body, carries out the last elimination to the noise, and after tertiary elimination, the noise reduces by a wide margin.

Drawings

FIG. 1 is a schematic of the present invention.

Fig. 2 is a schematic view of a sound deadening structure.

In the figure:

1. air intake, 2, air outlet, 3, clamp, 4, the first order amortization body, 41, indent circular conical surface, 42, vertical face, 5, the second grade amortization body, 51, outer convex circular conical surface, 6, the tertiary amortization body, 7, shell, 8, amortization layer, 9, bloop, 10, coaxial bloop, 11, stay tube.

Detailed Description

The utility model is further described below with reference to the accompanying drawings:

as shown in fig. 1 and 2, the utility model discloses a silencer for an air inlet of a fan, which comprises a shell 7 and a silencing structure arranged in the shell 7, wherein the silencing structure comprises a first-stage silencing body 4, a second-stage silencing body 5 and a third-stage silencing body 6 which are sequentially arranged from the air inlet 1 to the air outlet 2, a silencing layer 8 is embedded in the inner wall of the shell, the first-stage silencing body 4 is provided with an inner concave conical surface 41 facing the air inlet 1, the side surfaces of the second-stage silencing body 5 facing the air inlet 1 and the air outlet 2 are outer convex conical surfaces 41, and the third-stage silencing body 6 and the first-stage silencing body 4 are symmetrically arranged relative to the second-stage silencing body 5. Silencing holes 9 are uniformly distributed in the silencing body in the direction parallel to the axis of the silencer.

The noise gets into from air intake 1, fall and make an uproar through one-level amortization body 4, the indent circular conical surface 41 of one-level amortization body 4 collects the noise to the middle part, and one-level amortization body 4 is vertical face 42 towards the side of second grade amortization body 5, then 4 week sides of one-level amortization body are thick, and the middle part is thinner, week side noise reduction range is big, and middle part noise reduction range is little, the noise gets into second grade amortization body 5, the big both ends in second grade amortization body 5 middle are little, therefore, the noise reduction range of middle part is big, and stretch to week side gradually along second grade amortization body 5, gradually absorbed by second grade amortization body 5 at the in-process of stretching, come out from second grade amortization body 5 and arrive third grade amortization body 6 afterwards, third grade amortization body 6 is vertical face towards the side of second grade amortization body 5, the noise can wear out, further fall and make an uproar.

The silencer is a structure with two small ends and a large middle part, and the space at the position of the secondary silencing body 5 is large, so that main noise is digested at the position.

The casing 7 is arranged in two halves and is connected through the clamps 3 arranged at two ends, so that the internal silencing structure is convenient to install.

The first-stage, second-stage and third-stage muffling bodies 4, 5 and 6 are connected with each other, and two ends of the second-stage muffling body 5 are abutted against the center of the vertical surface 42 of the first-stage and second-stage muffling bodies. At least one coaxial muffling hole 9 is coaxially arranged between the three muffling bodies 5, and a supporting pipe 11 is arranged in the coaxial muffling hole 10 in a penetrating way. In this embodiment, the coaxial muffling holes 10 are provided on the center line of the muffling structure, maintaining the positional relationship between the muffling bodies.

The support tube 11 is provided with small holes on the periphery thereof through which noise can be absorbed by the silencer.

The air inlet 1 is provided with a filter screen 11 which can block impurities outside.

The above description is the preferred embodiment of the present invention, and it is within the scope of the appended claims to cover all modifications of the utility model which may occur to those skilled in the art without departing from the spirit and scope of the utility model.

Claims (8)

1. The utility model provides a fan air intake muffler which characterized in that: the silencer comprises a shell and a silencing structure arranged in the shell, wherein the silencing structure comprises a first-stage silencing body, a second-stage silencing body and a third-stage silencing body which are sequentially arranged from an air inlet to an air outlet, a silencing layer is embedded on the inner wall of the shell, the first-stage silencing body is provided with an inwards concave conical surface facing the air inlet, the second-stage silencing body faces the air inlet and the side face of the air outlet are outwards convex conical surfaces, and the third-stage silencing body and the first-stage silencing body are symmetrically arranged relative to the second-stage silencing body.

2. The silencer for the air inlet of the fan as claimed in claim 1, wherein: the casing sets up for two halves, sets up the clamp through both ends and connects.

3. The silencer for the air inlet of the fan as claimed in claim 1, wherein: the primary, secondary and tertiary muffling bodies are connected with each other, at least one coaxial muffling hole is coaxially arranged among the primary, secondary and tertiary muffling bodies, and a supporting tube is arranged in the coaxial muffling hole in a penetrating mode.

4. The silencer of claim 3 for the air inlet of the fan, wherein: the coaxial silencing hole is arranged on the central line of the silencing structure.

5. The silencer of claim 3 for the air inlet of the fan, wherein: the periphery of the supporting tube is provided with small holes.

6. The silencer for the air inlet of the fan as claimed in claim 1, wherein: the side surfaces of the first-level silencing body and the third-level silencing body, which face the second-level silencing body, are vertical surfaces, and one ends of the second-level silencing bodies, which are on the same side, are abutted against the center of the vertical surfaces.

7. The silencer for the air inlet of the fan as claimed in claim 1, wherein: the two ends are small and the middle is large.

8. The silencer for the air inlet of the fan as claimed in claim 1, wherein: a filter screen is arranged at the air inlet.

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