CN2692382Y

CN2692382Y - Bilayer dual expanding noise suppressor

Info

Publication number: CN2692382Y
Application number: CN 200420020963
Authority: CN
Inventors: 丁洪亮
Original assignee: Shanghai Hitachi Household Appliance Co Ltd
Current assignee: Shanghai Hitachi Household Appliance Co Ltd
Priority date: 2004-03-17
Filing date: 2004-03-17
Publication date: 2005-04-13
Anticipated expiration: 2014-03-17

Abstract

The utility model discloses a bilayer dual expanding noise suppressor. The body of the bilayer dual expanding noise suppressor is a circle base plate whose center is provided with a circular hole whose diameter is the same as that of the shaft of the compressor; the middle part of the base plate is convex upward; the periphery of the convex part is an irregular curve, which makes the diameter of the convex part great sometimes and small sometimes, and the convex part is divided into a plurality of expanding chambers having small capacities; at least one expanding chamber is provided with an air current outlet; the interior of the convex part is provided with a separator plate separating the convex part into an upper layer and a lower layer; the upper part and the lower part of the separator plate simultaneously forms a plurality of diffusion chambers; the separator plate is provided with two through holes which make the upper and the lower expanding chambers communicated; the upper expanding chamber, the lower expanding chamber, and air exhaust holes are respectively arranged in an approximately symmetrical mode. When the symmetrical expanding noise suppressor of the utility model is used, the noise suppressing frequency band is broadened, and the effect of the noise suppressing is reinforced; accordingly, the noise suppressing structure in the cylinder is cancelled, and the efficiency and the overall engine performance of the compressor are improved.

Description

Double-deck dual extension baffler

Affiliated technical field

The utility model relates to air-conditioning, refrigerator and the freezing rotary compressor of using, and specifically refers to the improvement to baffler in the air condition compressor.

Background technique

In compressor, compressed gas sprays at a high speed from the relief opening of cylinder, sends high frequency noise.For eliminating this noise, in the compressor specialized designs baffler.

In rotary compressor, baffler is located at the upper cylinder cover top of compresser cylinder, adopts the expanding structure substantially.The expanding baffler utilizes impedance noise-cancelling theory design, and its main structure feature is directly to export the expansion chamber B that has a volume bigger between the C at tubule footpath import A and tubule, as shown in Figure 3.Owing to after gas enters expansion chamber B from import A, can not discharge from outlet C immediately, can only in expansion chamber B, constantly reflect, thereby its energy is decayed.Studies show that each expansion chamber can only be eliminated the noise of a characteristic frequency section.Its noise reduction frequency is the natural reonant frequency of expansion chamber, and this resonant frequency is relevant with the length of expansion chamber B, and its sound-damping qualities is relevant with the ratio of flow outlet sectional area with the expansion chamber sectional area.

The main body of existing expanding baffler is one to be sheathed on compressor shaft and to be fixed on the circular substrate of cylinder upper cover top, this substrate middle part is to the one side projection, the periphery of this lug boss is irregular curve, little when big when making the diameter of lug boss, and lug boss is divided into some not isometric expansion chamber; Each expansion chamber is provided with flow outlet.Because the diameter of upper cylinder cover is limited, the baffler base plate can not be too big, and expansion chamber quantity can not be too many, the three chamber bafflers that generally are designed to have three expansion chamber at present, its airflow inlet is the relief opening of cylinder, and flow outlet is located on the sidewall of each expansion.After air-flow enters baffler, successively enter each expansion chamber, and discharge from each flow outlet.

As calculated with mensuration, the noise reduction frequency peak of this three chamber expanding bafflers is 798Hz, 1138Hz and 1164Hz, but find that through practical measurement the noise spectrum peak value of compressor is in 1600Hz and 2500Hz frequency range, and air-flow not exclusively flows through each expansion chamber in the existing baffler, so do not reach optimum efficiency, because the flow outlet of existing baffler is opened at the expansion chamber sidewall, exhaust has formed new noise source again herein simultaneously.In fact, because the effect of existing baffler is not ideal enough, so, often need to establish noise-reducing structure in compresser cylinder inside again.But the noise-reducing structure of this cylinder interior can increase clearance volume, influences the complete machine performance of compressor.

Summary of the invention

The purpose of this utility model is to propose a kind of double-deck dual extension baffler, adopt double layer construction to form the different many expansion chamber of resonant frequency, and utilize the symplex structure of expansion chamber and flow outlet, widen the noise reduction frequency band, strengthen erasure effect, to overcome narrow, the unconspicuous shortcoming of erasure effect of noise reduction frequency band of existing baffler.

Another purpose of the present utility model is the raising by erasure effect, realizes the noise-reducing structure in the cancellation cylinder, with the harmful effect to compressor performance that overcomes so bring.

A kind of double-deck dual extension baffler of the present utility model, its main body is a circular substrate, this substrate center have one with the isometrical circular hole of compressor shaft; Substrate middle part is to the one side projection, and the periphery of this lug boss is irregular curve, and is little when big when making the diameter of lug boss, and lug boss is divided into some not isometric expansion chamber; At least on some expansion chamber, be provided with flow outlet; It is characterized in that being processed with second lug boss on the described lug boss, between two-layer lug boss, have one should be divided into bilevel dividing plate by two-layer lug boss, form some expansion chamber simultaneously in the above and below of this dividing plate; This dividing plate is provided with the vent that upper and lower layers is communicated, and a certain expansion chamber is provided with flow outlet on the upper strata.

Each expansion chamber of described lower floor relative one symmetrical axisymmetric is arranged.

Described dividing plate is provided with two vents that upper and lower layers is communicated, and the position of these two vents is away from cylinder exhaust port.

In the expansion chamber of upper strata, on the crowning of ventilating hole two expansion chamber far away, respectively be provided with a flow outlet respectively.

Two flow outlets relative one symmetrical axisymmetric on two vents on the described dividing plate, each expansion chamber of upper strata and upper strata is arranged.

The beneficial effects of the utility model are: because after adopting double-deck symmetrical expansion baffler, increased the quantity of expansion chamber, widened the noise reduction frequency band, simultaneously because two exhaust outlet positions of this baffler are upwards symmetrical, therefore the sound wave that gives out from these two exhaust outlets can be interfered mutually at its symmetry axis, makes most of sound wave along the propagation of compressor axial cylinder top and not directly to external diffusion.The actual measurement proof: the noise at 1600Hz, 2000Hz and each frequency band of 2500Hz all uses former baffler to reduce 5-10dB.In addition, because two flow outlets of this baffler are selected upwards symmetric arrays, the sound wave that sends from both will be interfered mutually and weaken at its symmetry axis.Because this baffler has reached the erasure effect of expection, therefore can cancel the noise-reducing structure in the cylinder, thereby improve compressor efficiency and complete machine performance.

Description of drawings

Fig. 1 is an an embodiment's of the present utility model plan view.

Fig. 2 is the sectional drawing of Fig. 1.

The structure characteristic schematic representation of Fig. 3 expanding baffler.

Among the figure: 1 substrate, 2 cylinder exhaust ports (airflow inlet), 3 explosion chambers, 4 flow outlets, 5 dividing plates, 6 upper stratas, 7 lower floors, 8 vents, 9 compressor shafts, 10 cylinder upper covers.

Embodiment

Now the utility model is further specified in conjunction with an embodiment and accompanying drawing thereof.

By Fig. 1, Fig. 2, the main body of baffler of the present utility model is for to be formed by a steel-sheet circular substrate 1 punching stretch, substrate center have one with the isometrical circular hole of compressor shaft; The substrate middle part is to the one side projection, and stretched again second layer projection 6 on first layer projection 7, the periphery of lug boss is irregular curve, little when big when making the diameter of lug boss, and the first layer lug boss is divided into the expansion chamber 3a-3f that 6 volume differences are symmetric arrays, second layer lug boss is divided into the expansion chamber 3g-3j that 4 volume differences are symmetric arrays; Have one this lug boss is divided into bilevel dividing plate 5 in the described lug boss, dividing plate 5 is provided with two the vent 8a, the 8b that are communicated with upper and lower layers.

6 expansion chamber of lower floor 7 are made near symmetrical with a symmetry axis XX and are arranged, and 4 expansion chamber on upper strata 6 are made symmetry with symmetry axis YY and arranged.

The position of two vents 8 on the described dividing plate 5 is away from airflow inlet, and promptly cylinder exhaust port 2, and makes symmetry with symmetry axis YY and arrange.

Go out 4a, 4b being respectively equipped with air-flow on dividing plate upper vent 8 two expansion chamber 3h in upper strata far away and 3j, two flow outlet 4 openings are upwards made symmetry with symmetry axis yy and are arranged.

When baffler was fixed on cylinder upper cover 10 tops, the relief opening 2 of cylinder became the airflow inlet of baffler just.The main flow that enters the air-flow of expansion chamber 3 from cylinder exhaust port 2 (airflow inlet) at a high speed enters the upper strata explosion chamber through vent 8a or 8b on the dividing plate 5 again through expansion chamber 3a, 3b, 3c or 3d, 3e, the 3f of lower floor 7 earlier, pass through explosion chamber 3g, 3h or 3i, the 3j on upper strata 6 then, after repeatedly reflecting, go out 4a or 4b discharge at each explosion chamber from air-flow.As seen from Figure 1, the two-way high velocity air is respectively through 5 expansion chamber ability exhaust silencers, and the design of the resonant frequency of these 5 expansion chamber is about 1600Hz and 2500Hz.

Claims

1. double-deck dual extension baffler, its main body is a circular substrate, this substrate center have one with the isometrical circular hole of compressor shaft; The substrate middle part is to the one side projection, and the periphery of this lug boss is irregular curve, and lug boss is divided into some not isometric expansion chamber; At least on some expansion chamber, be provided with flow outlet; It is characterized in that being processed with second lug boss on the described lug boss, between two-layer lug boss, have one should be divided into bilevel dividing plate by two-layer lug boss, form some expansion chamber simultaneously in the above and below of this dividing plate; This dividing plate is provided with the vent that upper and lower layers is communicated, and a certain expansion chamber is provided with flow outlet on the upper strata.

2. baffler according to claim 1 is characterized in that the relative one symmetrical axisymmetric arrangement of each expansion chamber of lower floor.

3. baffler according to claim 1 is characterized in that described dividing plate is provided with two vents that upper and lower layers is communicated, and the position of these two vents is away from cylinder exhaust port.

4. baffler according to claim 1 is characterized in that respectively being provided with a flow outlet respectively on ventilating hole on the described dividing plate two expansion chamber far away.

5. according to claim 1,2,3 or 4 described bafflers, it is characterized in that two flow outlets relative one symmetrical axisymmetric on two vents, each expansion chamber of upper strata and upper strata on the described dividing plate is arranged.