CN1312425C - Expansion type silencer, refrigeration cycle loop using expansion type silencer and manufacturing method thereof - Google Patents

Abstract

An expansion type silencer which attenuates the pulsation waveform of a fluid, reduces vibration and sound, is economical, and has high reliability. The expansion type silencer comprises: an inlet port through which a fluid flows, a muffler body that expands the fluid flowing in from the inlet port, and an outlet port through which the fluid from the muffler body is decompressed and flows out; the muffler body has muffler chambers of different lengths integrally formed with each other with a pressure reducing communication hole for reducing the pressure of the fluid interposed therebetween.

Description

The freeze cycle loop and the manufacture method thereof of expansion type muffler and this expansion type muffler of use

Technical field

The present invention relates to a kind of expansion type muffler, the freeze cycle loop of using this expansion type muffler and manufacture method of this expansion type muffler to relaxing owing to the pressure oscillation of the fluid of from the compressor of refrigerating circuit etc., discharging, sound that pulsation produces and vibration.

Background technique

Because in the expansion type muffler of uses such as existing freeze cycle loop, the pressure pulsation change that can produce the fluid (refrigeration agent) of discharging from compressor etc. causes to produce to be vibrated and sound, perhaps, if the frequency of the vibration of these generations and sound is consistent with the natural frequency of the various parts that constitute the loop, then produce resonance and sympathetic response, variety of issues such as big vibration and sound occur, therefore, developed various expansion type mufflers, prevented the above-described problem from occurring.

And, as representative existing expansion type muffler, it is configured to: the two ends of tubular outer tube have the connection mouth of diameter less than principal part, under the state in being embedded in the two ends connection mouth of this outer tube airtightly, by being provided with open bore on the inner interior pipe of establishing of above-mentioned outer tube, be drawn into fluid pressure, the expansion of interior pipe from the connection mouth of outer tube, and flow to outer tube by above-mentioned open bore, thereby, the vibration that produces in the refrigerating circuit of air-conditioning, especially resonance wait the big vibration cause producing to be used as target to decay.The expansion type muffler of this structure is disclosed (for example: with reference to patent documentation 1).

Patent documentation 1: TOHKEMY 2001-4250 communique (the 2-4 page or leaf, Fig. 1)

As mentioned above, for existing expansion type muffler, though owing to consider resonance that the baffler chamber prevents to produce by certain certain vibration of use, thereby can prevent the vibration resonance that certain is specific, but, have a problem, promptly, in the occasion of the frequency change of the fluid pulsation by this baffler, baffler can't be followed the frequency after this variation.

In addition, though the amplitude of the fluid pulsation waveform of certain characteristic frequency that can decay, because after not considering frequency change, the amplitude of the frequency after harmonious these variations that decay well, therefore, existence can't the harmonious problem that suppresses vibration, noise well.

In addition, because number of components is many, it is complicated that processing becomes, so the problem that exists cost to uprise.

Summary of the invention

The present invention finishes for addressing the above problem, its purpose is: be provided in the simple relatively structure, even the ripple frequency of loop inner fluid produces the amplitude of change, pulsating waveform and changes, also can change and correspondingly reduce to vibrate with economical, the expansion type muffler that reliability is high of sound and use the freeze cycle loop of this expansion type muffler and the manufacture method of this expansion type muffler with these.

The integrated expansion type muffler that this invention is related, possess: the inflow entrance that fluid flows into, make the above-mentioned fluid expansion that flows into from this inflow entrance columnar baffler chamber, the above-mentioned fluid from this baffler chamber is reduced pressure and makes the outflow opening of its outflow

In above-mentioned columnar baffler chamber, between above-mentioned inflow entrance and outflow opening, form the decompression intercommunicating pore that diameter diminishes, by forming this intercommunicating pore, above-mentioned columnar baffler chamber is forming the first different baffler chamber of length and the second baffler chamber respectively between above-mentioned inflow entrance and the intercommunicating pore and between intercommunicating pore and the outflow opening.

In addition, the ratio of each length of above-mentioned baffler chamber is set at the ratio of prime number.

And the cross-section area of above-mentioned decompression intercommunicating pore is greater than the cross-section area of above-mentioned inflow entrance or above-mentioned outflow opening.

Also having, staggers mutually in the center of above-mentioned inflow entrance and above-mentioned outflow opening.

In addition, the expansion type muffler of the invention described above is configured on the pipe arrangement of discharge one side of compressor of discharge pulsating fluid in freeze cycle loop etc.

Above-mentioned compressor has the converter plant that changes its rotating speed.

In addition, the manufacture method of integrated expansion type muffler of the present invention has: the step that makes the rotation of baffler body;

Between the predefined initial position and end position of the baffler body of this rotation, apply external force by the roll that moves back and forth the amount of feed on the Vertical direction that has regulation simultaneously with constant speed in the horizontal direction, and with the outlet between initial position and the end position or loop as once extrusion process operation, along with the increase of this manufacturing procedure number of times, increase the amount of feed of Vertical direction of afore mentioned rules gradually and the step of pushing;

When the amount of feed after this increase reaches desired value, stop the step of above-mentioned extrusion process;

By above-mentioned extrusion process, form inflow entrance and the outflow opening of diameter less than this baffler body at baffler body two ends, and between these two ends, form the decompression intercommunicating pore of minor diameter, between this decompression intercommunicating pore and inflow entrance and outflow opening, form the different baffler chamber of length respectively by the diameter of baffler body.

Description of drawings

Fig. 1 is the concise and to the point sectional view of expansion type muffler in the embodiments of the present invention 1.

Fig. 2 (a)～Fig. 2 (c) is the performance plot of the frequency of fadings of expansion type muffler in the embodiments of the present invention 1.Wherein Fig. 2 (a) represents the 1st 1b of the anechoic chamber (attenuation-frequency characteristic that length L a) is located; The attenuation-frequency characteristic that Fig. 2 (b) expression the 2nd 1c of anechoic chamber (length L b) locates; Fig. 2 (c) expression attenuation-frequency characteristic that the 1st anechoic chamber+the 2nd 1c of anechoic chamber (length L c) locates.

Fig. 3 is the concise and to the point sectional view with embodiments of the present invention 1 corresponding existing expansion type muffler.

Fig. 4 is the concise and to the point sectional view with embodiments of the present invention 1 corresponding other existing expansion type mufflers.

Fig. 5 is the concise and to the point sectional view of expansion type muffler in the embodiments of the present invention 2.

Fig. 6 is the concise and to the point sectional view of expansion type muffler in the embodiments of the present invention 3.

Fig. 7 is the brief configuration figure in freeze cycle loop in the embodiments of the present invention 4.

Fig. 8 is the brief configuration figure of extruding machining apparatus in the embodiments of the present invention 5.

The concise and to the point pie graph of Fig. 9 when inflow entrance being carried out extrusion process in the embodiments of the present invention 5.

Figure 10 is the detailed working drawing of extrusion process in the embodiments of the present invention 5.

Embodiment

Mode of execution 1

With reference to Fig. 1 embodiments of the present invention 1 are described.Fig. 1 is the brief configuration sectional view of expansion type muffler, and is as shown in the drawing, and tubular expansion type muffler 1 of the present invention is by constituting with the bottom: the inflow entrance 1a that the pressure pulsation fluid flows into; The pulsating fluid that flows into from this inflow entrance 1a is expanded and make pulsating fluid produce the 1st baffler chamber 1b of the energy of diffuse reflection, absorption pressure change and pulsation at the noise reduction wall; By decompression intercommunicating pore 1d be made into to be connected with the 1st 1b of anechoic chamber and decay resonate at 1b place, the 1st anechoic chamber, the 2nd baffler chamber 1c of the pressure pulsation of resonance frequency; With the outflow opening 1e that is arranged at the effluent fluid on the 2nd baffler chamber 1c, these parts are made one.

Below, detailed narration is carried out in the action of the expansion type muffler of such formation.At first, if the pulsating fluid refrigeration agent of discharge flow into the 1st baffler chamber 1b by the inflow entrance 1a of expansion type muffler 1 from the compressor of air-conditioning etc., then the pulsating fluid of this inflow expands in the 1st baffler chamber 1b and releases energy, simultaneously, carry out diffuse reflection repeatedly with the noise reduction locular wall, by carrying out this diffuse reflection repeatedly and releasing energy the pulsating waveform of dampening fluid.

Promptly, decay the accordingly amplitude of pulsating waveform of the ratio that tube open cross-section long-pending with the open cross-section of inflow entrance 1a and the 1st baffler chamber 1b is amassed, the inconsistent frequency of length with the 1st baffler chamber 1b in the frequency of pulsating waveform is attenuated, thereby can suppress the vibration and the sound of pulsating fluid.

At this moment, though because the length of the length of pulsating waveform and baffler is consistent, therefore the pulsating waveform that frequency is consistent with the length (La) of the fluid flow direction of the mat woven of fine bamboo strips 1 baffler chamber 1b produces resonance, sympathetic response and energy strengthen, but, the fluid of the pulsating waveform after this energy strengthens is depressurized at decompression intercommunicating pore 1d place, flow into the 2nd different baffler chamber 1c of next length (Lb), at 1c place, baffler chamber the 2nd, similarly expand and release energy with above-mentioned, owing on the noise reduction wall, carry out irreflexive while repeatedly, energy is absorbed and is attenuated, and therefore consequently: the vibration and the sound of fluid are suppressed, and fluid flows out from outflow opening 1e.

And, at this moment, because the pulsating fluid that from this outflow opening 1e, flows out, from inflow entrance 1a flow through the 1st baffler chamber 1b, decompression intercommunicating pore 1d, the 2nd baffler chamber 1c, repeatedly reduce pressure repeatedly continuously, expand, so when decompression intercommunicating pore 1d has to a certain degree big or small, the 1st baffler chamber 1b and the 2nd baffler chamber 1c have the function of a baffler by decompression intercommunicating pore 1d, therefore, with the summation (Lc) of the length (Lb) of the length (La) of the 1st baffler chamber 1b and the 2nd baffler chamber 1c accordingly, the frequency of waveform also is attenuated, and fluid flows out.

That is, each frequency band that solid line is represented among Fig. 2 (a), Fig. 2 (b), Fig. 2 (c) is attenuated.

In other words, if the length (La) of each baffler of frequency of fadings, (Lb) and (Lc) exist the multiple of same number (comprise integer or integer beyond number) to concern each other, then Shuai Jian frequency is same frequency, because the zone of frequency of fadings reduces, thereby, can not make each baffler length each other identical, perhaps make the length of a baffler become the integral multiple of the length of other message device.

Especially at this moment, because if make each length of baffler chamber is integer, the merchant of the greatest common divisor of these integers is made of prime number, then can make the length of each baffler and each silencer length addition gained total length is stably become difference respectively, a plurality of different frequencies can harmonious well and reliably decay, therefore, can obtain the expansion type muffler of harmonious each different frequency of decaying well.

And, in order to obtain aforesaid effect of the present invention, even the structure that the 1st baffler chamber 1b just as shown in Figure 3 and the 2nd baffler chamber 1c are connected by pipe arrangement, because decompression, the continuity that expands are lowered by this connecting pipings, so, also become and to decay by pipe arrangement with the corresponding frequency suitable of summation (Lc) of the length (Lb) of the length (La) of the 1st baffler chamber 1b and the 2nd baffler chamber 1c with it, therefore, can't obtain attenuating, and the pipe arrangement space enlargement, the degrees of freedom of PIPING DESIGN reduces.

In addition, as shown in Figure 4, can adopt dividing plate is set in baffler, the decompression intercommunicating pore is set on this dividing plate, the structure that reduces pressure repeatedly continuously, expands, but because so, not only need to be provided with in addition dividing plate, this dividing plate is fixed in processing difficulties in the baffler, and the fluid approximate right angle bump against behind this dividing plate by the decompression intercommunicating pore, flow to next baffler chamber, therefore, it is big that stream sound becomes, and is not good method.

As mentioned above, in the present invention, because baffler has: the inflow entrance that fluid flows into; Make from baffler chamber the 1st of the above-mentioned fluid expansion of this inflow entrance inflow; Be made into the different baffler chamber the 2nd of fluid flow direction length one, above-mentioned with this first baffler chamber by making decompression intercommunicating pore from the fluid pressure of baffler chamber the 1st; Be arranged at above-mentioned fluid is reduced pressure and makes the outflow opening of its outflow in the baffler chamber the 2nd, used simple structure, can continuously and successfully carry out decompression, the expansion of fluid repeatedly, by these a plurality of different frequencies of decay that reduce pressure repeatedly, expand, therefore, can obtain the high economical expansion type muffler of extinction efficiency.

In addition, expansion type muffler for the invention described above, the baffler that will have the structure of the 1st baffler chamber 1b and the 2nd baffler chamber 1c is illustrated as typical example, but the present invention is not limited only to this structure, also can be again one to be made in turn by the decompression intercommunicating pore in baffler chamber the 3rd, the 4th, further carry out the structure of the decompression and the expansion of fluid.

Mode of execution 2

Describe with reference to 5 pairs of these mode of executions 2 of figure.In this mode of execution 2, the cross-section area of the decompression intercommunicating pore 1d of expansion type muffler 1 is greater than the cross-section area of inflow entrance 1a or outflow opening 1e in the mode of execution 1.

In addition, if make the cross-section area of decompression intercommunicating pore 1d become big as mentioned above, then the differentiation between the 1st baffler chamber 1b and the mat woven of fine bamboo strips 2 baffler chamber 1c is relaxed, the attenuation of each frequency from solid line shown in Figure 2 to dotted lines.Promptly, by with the 1st and the 2nd baffler chamber 1b, the length (La) of 1c, (Lb) consistent frequency (for example: the F11 of Fig. 2, F12, F13) sympathetic response, reduce energy enhancing amount, simultaneously, the frequency of fadings of summation (Lc) decision of the length by baffler chamber the 1st and the 2nd, F11, F12, F13 decay significantly.

So, if each frequency of fadings is known, can determine the size of baffler chamber length and decompression intercommunicating pore with these frequency of fadings accordingly, each frequency well then can harmony decays, therefore, especially night, the occasion of the air-conditioning that has frequency variator that slows down, undisturbedly turns round at the rotating speed of compressor etc. becomes effectively.

Mode of execution 3

Describe with reference to 6 pairs of these mode of executions 3 of figure.In this mode of execution 3, as shown in Figure 6, stagger mutually in the center of the inflow entrance 1a of expansion type muffler 1 cylindraceous and the center of outflow opening 1e.

So, improve, therefore, can obtain pipe arrangement configuration expansion type muffler easy, easy to use owing to be connected in the design freedom of the pipe arrangement of expansion type muffler 1.

Mode of execution 4

Describe with reference to 7 pairs of these mode of executions 4 of figure.In this mode of execution 4, as shown in Figure 7, in the refrigerating circuit of air-conditioning etc., particularly on the pipe arrangement of discharge one side of the compressor of this refrigerating circuit, disposed any expansion type muffler 1 in the above-mentioned mode of execution 1 to 3.

So, because the generation from pulsing, that is, the fluid of discharging from compressor (refrigeration agent) can be decayed before flowing into the parts of refrigerating circuit, therefore can carry out attenuate pulsations effectively.

Promptly, because the freeze cycle loop is complicated loop, and there are a plurality of parts that constitute this complicated loop with various natural frequencys, so if fluid flow into these parts, the pulsation by this fluid may cause resonance and sympathetic response, therefore, in order to prevent the generation of this resonance and sympathetic response, configuration expansion type muffler 1 on the pipe arrangement of discharge one side of compressor, thus can prevent the resonance and the sympathetic response that produce by fluid pulsation.

In addition, compressor 2 for the refrigerating circuit of air-conditioning etc., in the occasion of compressor 2 with certain rotation speed operation, though if use length and the corresponding baffler of above-mentioned rotating speed (frequency), can eliminate resonance and sympathetic response substantially, but, occasion at compressor with the transformable frequency variator of rotating speed, especially the ripple frequency owing to fluid (refrigeration agent) changes by change in rotational speed, and the corresponding most frequency field of needs, therefore if any expansion type muffler in the mode of execution 1 to 3 is installed, promptly, if the baffler of a plurality of different frequencies of decay is installed, then can obtain effectively to prevent by the sympathetic response of fluid pulsation generation and the freeze cycle loop of resonance.

Mode of execution 5

With reference to figure 8 to Figure 10 this mode of execution 5 is described.This mode of execution 5 relates to a kind of manufacture method of expansion type muffler, and as shown in Figure 8, this expansion type muffler has: the inflow entrance 1a that fluid flows into; Make the baffler body 1 that constitutes by copper pipe etc. of the above-mentioned fluid expansion that flows into from this inflow entrance 1a; Above-mentioned fluid from this body is reduced pressure and makes the outflow opening 1e of its outflow, be made into the different baffler chamber of length on the fluid flow direction separately of one across the decompression intercommunicating pore 1d that convection cell reduces pressure in the middle of the baffler body 1 that is made of copper pipe etc. has.

Then, the manufacture method to this expansion type muffler describes.At first, the baffler body 1 that is made of copper pipe etc. is installed in an end of fixing this baffler body 1, is pressed in rotatably on the mounting fixture 10a of extruding machining apparatus 10 of its other end freely, makes said fixing anchor clamps 10a rotation, thereby makes the copper pipe rotation.

Then, because the 10b of roll portion of processing device 10 applies the external force of regulation to the end position of extrusion process, with certain first vertical feed amount (for example 2mm) from the extruding initial position of this rotation copper pipe 1, move along substantially horizontal with certain speed simultaneously, therefore, be accomplished to the processing in (a) stage of Figure 10.

At this moment,, rotates on the copper pipe 10b of roll portion, so rotation because being pressed against.

After above-mentioned process finishing, because the first vertical feed quantitative change of the 10b of roll portion is become approximately for example 2 times (for example 4mm), when the 10b of roll portion applies the external force of regulation to copper pipe, move along substantially horizontal to the initial position from the extrusion process end position, therefore, proceed to the processing in (b) stage of Figure 10.

Then, following extrusion process is also identical, will be from the initial position to the process finishing position, perhaps the extrusion process from the process finishing position to the initial position is as 1 time manufacturing procedure, the number of times of this manufacturing procedure be multiply by the value of first vertical feed amount gained or greater than the value of vertical feed last time amount vertical feed amount as the 10b of squeezing roll portion, when applying the external force of regulation to copper pipe with this vertical feed amount, push repeatedly, if process repeatedly by this, the vertical feed amount of the 10b of roll portion reaches target vertical feed amount, that is, reach the decompression intercommunicating pore size of appointment, then extrusion process operation is finished.

When this extrusion process is finished, the 10b of roll portion in next initial position or the process finishing position stop.

Then, in the extrusion process of finishing above-mentioned baffler body 1, in the outflow opening 1e that inflow entrance 1a that not little than this body diameter fluid flows in this baffler body 1 and fluid flow out, as shown in Figure 9, oral area in the side of not processing inflow entrance 1a or outflow opening 1e of baffler body 1, the iron core of the off-centre when suppressing extrusion process of packing into, the inflow entrance 1a of this iron core one side of not packing into or the extrusion process of outflow opening 1e are same as described above, the 10b of roll portion from the extruding the initial position to the end of copper pipe (end position), apply the external force of regulation on one side, only little by little increase the vertical feed amount on one side with its each amount of finish, push simultaneously, this amount of compression reaches the target amount of compression, that is, when reaching the size of the inflow entrance 1a of appointment or outflow opening 1e, extrusion process is finished.

Make expansion type muffler if carry out aforesaid extrusion process, because when the wall thickness of press section reaches roughly uniformly the wall thickness state, fluid flows to target decompression intercommunicating pore, slowly after the decompression, slowly expand, therefore can obtain the intensity height, the manufacture method of the little expansion type muffler of sound that flows.

In the above description, though made expansion type muffler by extrusion process,, the mould of also the baffler body can being packed into adds high pressure oil, thereby makes expansion type muffler of the present invention in the baffler body of this mould of packing into.

The present invention's expansion type muffler as mentioned above possesses: the inflow entrance that fluid flows into; Make from the baffler body of the above-mentioned fluid expansion of this inflow entrance inflow; Above-mentioned fluid from this baffler body is reduced pressure and makes the outflow opening of its outflow, in the middle of having, above-mentioned baffler body is made into the different baffler chamber of length separately of one across the decompression intercommunicating pore that makes above-mentioned fluid pressure, thereby, by simple structure, can be in the decompression of also carrying out fluid continuously smoothly repeatedly, expansion, therefore a plurality of different frequency bands of decaying, can obtain the high economical expansion type muffler of extinction efficiency.

In addition, because each length of above-mentioned baffler chamber is integer, the merchant of the greatest common divisor of these integers is made of prime number, thereby, can be harmonious well and reliably decay be not less than a plurality of different frequency of the number of baffler chamber, therefore, can obtain harmonious well and the expansion type muffler of decaying effectively.

In addition, because the area of above-mentioned decompression intercommunicating pore, therefore can obtain harmonious well and effectively the decay by the expansion type muffler of the frequency of fadings of the length decision of each baffler chamber greater than the area of above-mentioned inflow entrance or above-mentioned outflow opening.

In addition, owing to stagger mutually in the center of above-mentioned inflow entrance and above-mentioned outflow opening, therefore can obtain pipe arrangement configuration expansion type muffler easy and easy to use.

And, because any above-mentioned expansion type muffler of technological scheme 1 to 4 is configured on the pipe arrangement of discharge one side of compressor of discharge pulsating fluid in freeze cycle loop etc., thereby, can be before fluid flow into a plurality of parts with various natural frequencys of refrigerating circuit the pulsating waveform of dampening fluid, therefore can obtain to have suppressed the freeze cycle loop of vibration and sound.

In addition, because above-mentioned compressor has the converter plant that changes its rotating speed, thereby, especially at night,, also can quietly turn round even the rotating speed of compressor is slack-off, therefore can obtain to vibrate the freeze cycle loop little with sound.

In addition, owing to have: the step that makes the rotation of baffler body; Between the predefined initial position and end position of the baffler body of this rotation, in vertical direction with certain amount of feed, the step that applies regulation external force that moves back and forth with certain speed in the horizontal direction; With the outlet between above-mentioned initial position and the end position or loop as once extrusion process operation, in each this manufacturing procedure, increase the step of above-mentioned certain amount of feed; When reaching the target amount of compression, the amount of feed after this increase stops the step of above-mentioned extrusion process, be provided with the baffler chamber that accompanies the decompression intercommunicating pore each other in the above-mentioned baffler body, therefore, by the baffler body being carried out repeatedly reciprocating extrusion processing, wall thickness is roughly even, and, fluid flows to the decompression intercommunicating pore, slowly after the decompression, slowly expand, thereby can obtain the intensity height, the manufacture method of the little expansion type muffler of sound that flows.

Claims (7)

1. integrated expansion type muffler possesses: the inflow entrance that fluid flows into, make the above-mentioned fluid expansion that flows into from this inflow entrance columnar baffler chamber, the above-mentioned fluid from this baffler chamber is reduced pressure and makes the outflow opening of its outflow,

It is characterized in that: in above-mentioned columnar baffler chamber, between above-mentioned inflow entrance and outflow opening, form the decompression intercommunicating pore that diameter diminishes, by forming this intercommunicating pore, above-mentioned columnar baffler chamber is forming the first different baffler chamber of length and the second baffler chamber respectively between above-mentioned inflow entrance and the intercommunicating pore and between intercommunicating pore and the outflow opening.

2. according to the expansion type muffler of claim 1, it is characterized in that: the ratio of each length of above-mentioned baffler chamber is set at the ratio of prime number.

3. according to the expansion type muffler of claim 1, it is characterized in that: the cross-section area of above-mentioned decompression intercommunicating pore is greater than the cross-section area of above-mentioned inflow entrance or above-mentioned outflow opening.

4. according to the expansion type muffler of claim 1, it is characterized in that: staggers mutually in the center of above-mentioned inflow entrance and above-mentioned outflow opening.

5. freeze cycle loop is characterized in that: any expansion type muffler of claim 1 to 4 is configured on the pipe arrangement of discharge one side of compressor of discharge pulsating fluid in freeze cycle loop.

6. according to the freeze cycle loop of claim 5, it is characterized in that: above-mentioned compressor has the converter plant that changes its rotating speed.

7. the manufacture method of an integrated expansion type muffler is characterized in that: have: the step that makes the rotation of baffler body;

Between the predefined initial position and end position of the baffler body of this rotation, apply external force by the roll that moves back and forth the amount of feed on the Vertical direction that has regulation simultaneously with constant speed in the horizontal direction, and with the outlet between above-mentioned initial position and the end position or loop as once extrusion process operation, along with the increase of this manufacturing procedure number of times, increase the amount of feed of Vertical direction of afore mentioned rules gradually and the step of pushing;

When the amount of feed after this increase reaches desired value, stop the step of above-mentioned extrusion process;

By above-mentioned extrusion process, form inflow entrance and the outflow opening of diameter less than this baffler body at baffler body two ends, and between these two ends, form the decompression intercommunicating pore of minor diameter, between this decompression intercommunicating pore and inflow entrance and outflow opening, form the different baffler chamber of length respectively by the diameter of baffler body.

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