CN114673648B - Compressor muffler and manufacturing process thereof - Google Patents
Compressor muffler and manufacturing process thereof Download PDFInfo
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- CN114673648B CN114673648B CN202210377505.4A CN202210377505A CN114673648B CN 114673648 B CN114673648 B CN 114673648B CN 202210377505 A CN202210377505 A CN 202210377505A CN 114673648 B CN114673648 B CN 114673648B
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- silencing
- chamber
- muffler
- injection molding
- cavity
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000001746 injection moulding Methods 0.000 claims abstract description 74
- 238000010438 heat treatment Methods 0.000 claims abstract description 58
- 238000003466 welding Methods 0.000 claims abstract description 45
- 238000002347 injection Methods 0.000 claims abstract description 34
- 239000007924 injection Substances 0.000 claims abstract description 34
- 239000002994 raw material Substances 0.000 claims abstract description 23
- 238000007689 inspection Methods 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 230000030279 gene silencing Effects 0.000 claims description 144
- 239000012768 molten material Substances 0.000 claims description 28
- 238000003780 insertion Methods 0.000 claims description 27
- 230000037431 insertion Effects 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 27
- 238000000465 moulding Methods 0.000 claims description 24
- 238000005192 partition Methods 0.000 claims description 17
- 238000000926 separation method Methods 0.000 claims description 17
- 230000003584 silencer Effects 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 15
- 239000008187 granular material Substances 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 9
- 230000007547 defect Effects 0.000 claims description 5
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 15
- 230000008030 elimination Effects 0.000 abstract description 15
- 238000003379 elimination reaction Methods 0.000 abstract description 15
- 230000009467 reduction Effects 0.000 abstract description 10
- 238000002360 preparation method Methods 0.000 abstract description 8
- 238000001035 drying Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 24
- 230000005540 biological transmission Effects 0.000 description 15
- 239000000463 material Substances 0.000 description 13
- 238000013016 damping Methods 0.000 description 11
- 239000003507 refrigerant Substances 0.000 description 11
- 238000009413 insulation Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 230000001743 silencing effect Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 239000010721 machine oil Substances 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0027—Pulsation and noise damping means
- F04B39/0083—Pulsation and noise damping means using blow off silencers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76498—Pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76655—Location of control
- B29C2945/76658—Injection unit
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76822—Phase or stage of control
- B29C2945/76859—Injection
Abstract
A compressor muffler and a manufacturing process thereof belong to the technical field of compressor assembly, and the manufacturing process of the compressor muffler comprises raw material drying treatment; heating the baked raw materials in sections; the muffler component performs high-pressure injection and low-pressure maintaining during injection molding; cooling, demolding, assembling and welding to form after injection molding; quality inspection; the invention has the beneficial effects that the preparation process of the muffler is standardized, the preparation period and the preparation cost of the finished product can be reduced by simple steps, the quality of the finished product is improved, and the performance index of the muffler can be improved; meanwhile, by changing the structure of the existing muffler, the range of the noise elimination frequency can be enlarged, and the noise elimination and noise reduction effects are improved.
Description
Technical Field
The invention relates to the technical field of compressor assembly, in particular to a compressor muffler and a manufacturing process thereof.
Background
Noise generated by a compressor is a main source of refrigerator noise, and the noise is one of important indexes for measuring the quality of the refrigerator compressor. Refrigerator compressor noise can be classified into pneumatic noise, mechanical noise, and electromagnetic noise, wherein the pneumatic noise has the greatest proportion. The pneumatic noise is mainly generated at the air inlet and outlet ends of the compressor, particularly the air suction noise is most prominent, the air suction process is discontinuous due to the existence of the valve plate, meanwhile, high-pressure expansion exists, in the pneumatic noise, the air flow pulsation becomes an important noise source, and the air suction noise is usually controlled by adopting an air suction muffler. It follows that the acoustic performance of the suction muffler has a significant impact on the quality of the refrigerator compressor.
In the process of processing and production, the existing suction muffler has the advantages of complex process steps, low preparation efficiency and high cost because the existing process has no certain process standard in the preparation process, and the prepared finished product has uneven quality, is mainly characterized by uneven wall thickness of the finished product, has poor heat and sound insulation effects, and cannot meet the process requirements of the existing muffler.
In addition, the structure of the existing suction muffler has certain defects, for example, the existing suction muffler needs to be designed into a 'through-air' structure for installation, namely, the muffler is provided with a left acoustic silencing cavity and a right acoustic silencing cavity, a first expansion chamber A is arranged on the left side, a second expansion chamber B is arranged on the right side, and a necking installation structure-through-air structure C is arranged at the joint between the first expansion chamber A and the second expansion chamber B. The length of the expansion chamber is reduced due to the 'through-air', the length of the expansion chamber is reduced, the noise elimination frequency range is reduced, meanwhile, the section of the refrigerant suddenly becomes smaller in the process of going from the first expansion chamber to the second expansion chamber due to the 'through-air', the pressure loss of the refrigerant is increased, and the pressure reduction amount generated before and after the air flow passes through the muffler is increased. The total pressure difference is increased, so that the total pressure loss is larger, the influence on the refrigerating capacity of the compressor is larger, and the compressor energy efficiency is lower; furthermore, because the silencing chamber is too small, the low-frequency silencing capability is weak due to structural defects, low-frequency sound of a specific frequency band cannot be eliminated at all, and the silencing frequency and silencing range are reduced due to the 'through' silencing cavity, so that users can complain due to poor sound quality caused by the fact that a plurality of frequency bands are out of range, particularly the low-frequency noise is out of range.
Disclosure of Invention
In order to solve the technical problems, the invention provides the compressor muffler and the manufacturing process thereof, and the manufacturing process of the muffler is standardized, so that the manufacturing period and the manufacturing cost of a finished product can be reduced by simple steps, the quality of the finished product is improved, and the performance index of the muffler can be improved; meanwhile, by changing the structure of the existing muffler, the range of the noise elimination frequency can be enlarged, and the noise elimination and noise reduction effects are improved.
In order to achieve the above purpose, the technical scheme adopted by the invention for solving the technical problems is as follows: the manufacturing process of the compressor muffler comprises the following steps:
step 1: roasting the injection molding solid raw materials and then putting the injection molding solid raw materials into a charging barrel of an injection molding machine;
step 2: the baked raw materials enter an injection molding machine barrel from a charging barrel to be heated in sections, and the raw materials are heated to a molten state;
step 3: when injection molding is started, the pressure applied to the molten material by the top of the screw of the injection molding machine is 80-100 MPa, the injection flow is 36-40 g/s, the pressure is maintained when the mass of the molten material in the injection molding machine reaches 10-20% of the initial position, the pressure is 42-50 MPa, the injection flow is 8-16 g/s, and the pressure maintaining time is 10-20 s;
step 4: injection molding the muffler component according to the methods of the step 1 and the step 2, cooling, demolding, assembling and welding to form;
step 5: performing quality inspection on the silencer forming part;
step 6: packaging and warehousing.
The injection molding solid raw material is set as PBT granules, the baking temperature of the PBT granules is 130-140 ℃, and the baking time is 4-5 h.
The injection molding machine barrel in the step 2 is sequentially provided with a heating section I, a heating section II, a heating section III, a heating section IV and a heating section V along the injection molding direction, wherein the temperature of the heating section I is 240-260 ℃, the temperature of the heating section II is 260-280 ℃, the temperature of the heating section III is 280-300 ℃, the temperature of the heating section IV is 295-315 ℃, the heating section V is positioned at a nozzle of the injection molding machine barrel, the temperature of the heating section V is 295-315 ℃, the heating proportion is 50-70%, and the heating time is 10-20 s.
The uniformity of the wall thickness of the silencer component obtained by injection molding according to the method of the step 1 and the step 2 is 90-100%, and the molding shrinkage is 1-2.3%.
And welding the muffler component by adopting a high-frequency welding machine, wherein the high-frequency welding temperature is 250-270 ℃, and the welding time is 4-7 s.
The quality inspection of the silencer molded part in the step 4 comprises tensile strength inspection and pipeline unblocked inspection, wherein the tensile strength inspection method is that after the tensile force of 180-210N is adopted for 4s, if no crack defect occurs at a welding line, the welding strength is qualified, otherwise, the welding strength is unqualified; the pipeline unblocked inspection method is that gas with the pressure of 0.35MPa is introduced into an air suction port of the muffler, if the gas outlet is detected to have the gas outlet pressure of 0.28-0.35 MPa, the pipeline is unblocked, and if the gas outlet is detected to have the gas outlet pressure of less than 0.28MPa, the pipeline is blocked and is unqualified.
The manufacturing process comprises an upper silencing chamber, a communicating device I, a lower silencing chamber and a communicating device II, wherein the upper silencing chamber is connected with the communicating device I to form a resonant cavity, the lower silencing chamber is connected with the communicating device II and then is welded with the upper silencing chamber to form a first silencing cavity and a second silencing cavity which are communicated with the resonant cavity, and the volume of the second silencing cavity close to the resonant cavity is smaller than that of the first silencing cavity.
The connector I comprises a partition board I in interference fit with the upper anechoic chamber, an insertion pipe I integrally formed with the partition board I is arranged on the partition board I, and the insertion pipe I is communicated with the second anechoic chamber and the resonance chamber.
The connector II comprises a partition board II in interference fit with the lower silencing chamber, an insertion pipe II and a wavelength pipe are arranged on the partition board II, the insertion pipe II is integrally formed with the partition board II, the first silencing cavity and the second silencing cavity are communicated with each other, the wavelength pipe is positioned at one end part of the first silencing cavity and is sealed, the length L=lambda/4 of the wavelength pipe is lambda of silencing frequency band wavelength; the separation ratio of the second silencing cavity to the first silencing cavity is 0.3-0.5.
The lower silencing chamber is provided with an air suction port communicated with the first silencing cavity, and the upper silencing chamber is provided with an air outlet communicated with the second silencing cavity;
the port of the upper silencing chamber is matched with the port of the lower silencing chamber in a clamping way and is connected with the port of the lower silencing chamber in a sealing and welding way through a welding wire ring;
an oil leakage hole I is formed in the connector II, an oil leakage hole II opposite to the oil leakage hole I is formed in the bottom of the lower silencing chamber, and an oil baffle plate is arranged on the lower silencing chamber at the bottom of the oil leakage hole II;
the inner walls of the upper silencing chamber and the lower silencing chamber are in uniform transition and have the same wall thickness.
The beneficial effects of the invention are as follows:
1. according to the invention, the solid raw material enters the injection molding machine barrel from the charging barrel to be heated in a segmented mode, the raw material can be heated to be in a molten state, the fluidity of injection is improved, when the muffler component is used for injection molding, the injection molding process is divided into two stages according to the quantity of the molten material in the injection molding machine, the high-pressure injection molding stage and the pressure maintaining stage are included, the molten material has a certain die speed in the high-pressure injection molding stage, the molten material can be compacted, and the thermal shrinkage rate is increased due to the fact that the injection pressure is large, so that the pressure maintaining is carried out when the quality of the molten material in the injection molding machine reaches 10-20% of the initial position, the compactness and the wall thickness uniformity of a finished product can be increased, the molding shrinkage rate of the finished product is reduced, and the heat insulation and sound insulation effects are good.
2. According to the invention, the existing silencer structure is improved, and the cavity structure formed by the upper silencing chamber and the lower silencing chamber is divided by the communicating device I and the communicating device II to form a first silencing cavity, a second silencing cavity and a resonant cavity which are communicated with each other, and after air flow enters the first silencing cavity through the air suction port, the length and the volume of the first silencing cavity are longer, so that the silencing effect of the first silencing cavity in a high frequency band is better; the air flow enters the second silencing cavity with longer length through the insertion pipe II on the communicating device II, and the peak value of specific middle-high frequency narrower-band noise can be weakened because the communicating device II is also provided with the wave length pipe with one closed end and the length of lambda/4; the air current gets into the resonant cavity through the inserted tube I on UNICOM ware I again, through length, internal diameter and the position of UNICOM ware I of adjusting inserted tube I, can carry out the noise elimination to the noise of specific lower frequency channel, has increased the frequency range of noise elimination, can obtain the transmission loss of more frequency channels, makes noise elimination noise reduction effect better.
3. According to the invention, the baffle I is in interference fit with the upper silencing chamber, the baffle II is in interference fit with the lower silencing chamber, so that the impact of pulsating air flow to the communicating device I and the communicating device II is avoided to generate regenerative noise, the interference fit around the baffle I also prevents sound waves from passing through the matching position of the baffle I and the communicating device II, so that the silencing effect is good, and meanwhile, the welding wire is used for welding the upper silencing chamber and the lower silencing chamber tightly together by high-frequency welding, so that the integral tensile strength is improved, and the reliability is better.
4. The first silencing cavity and the second silencing cavity designed by the invention are longer in length, wider in width, larger in whole volume, uniform in transition of inner wall and equal in wall thickness, air flow enters the first silencing cavity from the air suction port in a jet flow mode and is mixed with air with lower flow rate in the cavity, and a certain range of vortex and reflux are formed in the cavity, so that the speed distribution in the first silencing cavity is uneven, but the energy dissipation and loss are caused by the larger volume of the first silencing cavity, the pressure reduction amount of the refrigerant in the flowing process is reduced, the local resistance loss is small, the total pressure difference is reduced, and the total pressure loss is smaller.
Drawings
The contents of the drawings and the marks in the drawings of the present specification are briefly described as follows:
FIG. 1 is a schematic view of a prior art suction muffler;
FIG. 2 is a process flow diagram of the muffler process of the present invention;
FIG. 3 is a schematic structural view of the muffler of the present invention;
FIG. 4 is a full cross-sectional view of FIG. 3;
FIG. 5 is an exploded view of FIG. 3;
FIG. 6 is a simulation graph of the relationship between frequency and transmission loss obtained after modeling the muffler in examples 1, 2 and comparative examples 1, 3 of the present invention;
FIG. 7 is a simulation graph showing the relationship between frequency and transmission loss obtained after modeling the muffler in examples 2 and 3 and comparative examples 2 and 3 of the present invention;
the labels in the above figures are: 1. the welding wire ring welding machine comprises an upper silencing chamber, an air outlet, a 2-communicating device I, a 21-separating plate I, a 22-inserting pipe I, a 3-lower silencing chamber, a 31-air suction port, a 32-oil leakage hole II, a 33-oil baffle plate, a 4-communicating device II, a 41-separating plate II, a 42-inserting pipe II, a 43-wave tube, a 44-oil leakage hole I, a 5-resonant cavity, a 6-first silencing cavity, a 7-second silencing cavity, a 8-welding wire ring, a A-first expansion chamber, a B-second expansion chamber and a C-penetrating structure.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and the following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The specific embodiment of the invention is as follows: as shown in fig. 2, a manufacturing process of a muffler of a compressor includes the following steps:
step 1: the injection molding solid raw material is put into a charging barrel of an injection molding machine after being baked, wherein the injection molding solid raw material is PBT particles, the baking temperature of the PBT particles is 130-140 ℃ and the baking time is 4-5 hours, so as to fully bake the PBT particles and soften the PBT particles;
step 2: the baked raw materials enter an injection molding machine barrel from a charging barrel to be heated in a segmented mode, so that the raw materials are heated to a molten state: the injection molding machine barrel is sequentially provided with a heating section I, a heating section II, a heating section III, a heating section IV and a heating section V along the injection molding direction, wherein the temperature of the heating section I is 240-260 ℃, the temperature of the heating section II is 260-280 ℃, the temperature of the heating section III is 280-300 ℃, the temperature of the heating section IV is 295-315 ℃, the heating section V is positioned at a nozzle of the injection molding machine barrel, the temperature of the heating section V is 295-315 ℃, the heating proportion is 50-70%, the actual heating temperature at the nozzle is the product of the temperature of the heating section V and the heating proportion, and the injection molding machine barrel is halted and enters a heat preservation state after the heating proportion reaches the set proportion, and the heat preservation heating time is 10-20 s. The gradient heating of the raw materials can ensure that the baked raw materials are heated from low temperature to high temperature, thereby ensuring that the PBT granular material is heated to a fully molten state and improving the fluidity of injection.
Step 3: when injection molding is started, the pressure applied to the molten material by the top of the screw of the injection molding machine is 80-100 MPa, the injection flow rate is 36-40 g/s, no material is in the molding die in the initial injection molding state, when the injection pressure is increased, the flow resistance of PBT plastic material can be overcome, the molten material has a certain die speed, the shearing action of the material through a die gate is larger, the orientation degree is higher, therefore, the heat shrinkage rate is increased along with the increase of the injection pressure, in order to avoid the influence of the initial injection pressure on the molding shrinkage rate, the pressure is maintained when the mass of the molten material in the injection molding machine reaches 10-20% of the initial position, the pressure is maintained at 42-50 MPa, and the injection flow rate is 8-16 g%s, the dwell time is 10-20 s, the dwell pressure is the injection pressure when certain material exists in the mould die cavity, and the shearing action of material at the runner department is less than the initial pressure of moulding plastics at this moment, increases the dwell pressure and can make injection molding product compaction degree increase, and thermal contraction reduces, and elastic recovery increases simultaneously to make shaping shrinkage rate reduce. The magnetic dial indicator is adopted to test the dimensional change of the injection sample piece parallel to the material flow direction, and the formula is adoptedWherein M is the size of the mold cavity at room temperature, L is the size of a sample corresponding to the mold cavity, and the molding shrinkage rate is 1-2.3%. Therefore, the wall thickness of the silencer component can be guaranteed to be uniform by adopting high-pressure injection molding and pressure maintaining, the wall thickness of the silencer component can be extracted during testing, an oil gauge caliper is adopted to directly measure the wall thickness of the silencer component aiming at a flat surface, the arc-shaped area is intercepted by aiming at an arc-shaped surface, different positions are measured respectively by measuring the micrometer size of a sharp point to measure the wall thickness uniformity of the silencer component to be 90-100%, and the heat insulation and sound insulation effects are good.
Step 4: and (2) carrying out cooling, demolding, assembling and welding molding on the injection molded silencer component according to the methods in the step (1) and the step (2), and welding the silencer component by adopting a high-frequency welding machine during welding, wherein the high-frequency welding temperature is 250-270 ℃, and the welding time is 4-7 s.
Step 5: the quality inspection of the silencer forming part comprises the steps of tensile strength inspection and pipeline unblocked inspection, wherein the tensile strength inspection method comprises the steps of adopting 180-210N tensile force, maintaining for 4 seconds, and if no crack defect exists at a welding line, judging that the welding strength is qualified, otherwise, judging that the welding strength is unqualified; the method for checking the unblocked pipeline comprises the steps of introducing gas with the pressure of 0.35MPa into an air suction port 31 of the silencer, unblocking the pipeline if the gas outlet 11 detects that the gas outlet pressure is 0.28-0.35 MPa, and blocking the pipeline if the gas outlet 11 detects that the gas outlet pressure is less than 0.28MPa, and failing.
Step 6: packaging and warehousing.
As shown in fig. 3 to 5, the specific structure of the compressor muffler manufactured by the manufacturing process is as follows: the compressor muffler comprises an upper muffling chamber 1, a communicating device I2, a lower muffling chamber 3 and a communicating device II 4, wherein the upper muffling chamber 1 is connected with the communicating device I2 to form a resonant cavity 5, the lower muffling chamber 3 is connected with the communicating device II 4 and then is welded and connected with the upper muffling chamber 1 to form a first muffling cavity 6 and a second muffling cavity 7 which are communicated with the resonant cavity 5, the volume of the second muffling cavity 7 close to the resonant cavity 5 is smaller than that of the first muffling cavity 6, after the air flow enters the first muffling cavity 6, the length and the volume of the first muffling cavity 6 are longer, so that the muffling effect of the first muffling cavity 6 in a high frequency band is better, the air flow enters the second muffling cavity 7 from the first muffling cavity 6, the second muffling cavity 7 enters the resonant cavity 5 to muffle specific noise in a lower frequency band, the transmission loss of more frequency bands is increased, and the muffling effect is better.
The length of the first silencing cavity 6 and the second silencing cavity 7 are longer, the width of the first silencing cavity is wider, the whole volume of the first silencing cavity 6 and the second silencing cavity 7 is larger, the inner walls of the first silencing cavity 6 and the second silencing cavity 7 are in uniform transition, the wall thickness of the first silencing cavity is equal, air flow enters the first silencing cavity 6 in a jet flow mode through the air suction port 31 and is mixed with air with low flow velocity in the cavity, a certain range of vortex and reflux are formed in the cavity, the speed distribution in the first silencing cavity 6 is uneven, but the energy dissipation and loss are caused due to the fact that the volume of the first silencing cavity 6 is larger, the pressure reduction amount of a refrigerant in the flowing process is reduced, the local resistance loss is small, the total pressure loss is small due to the fact that the total pressure difference is small, meanwhile, more refrigerant can be collected due to the fact that the whole volume of the silencing cavity is larger, the air suction capacity is reduced, and the refrigerating capacity of a compressor is improved.
Specifically, the communicating vessel I2 comprises a partition board I21 in interference fit with the upper anechoic chamber 1, the periphery of the partition board I21 is 0.15-0.35 mm larger than the unilateral size of the matching surface of the upper anechoic chamber 1, an insertion pipe I22 integrally formed with the partition board I21 is arranged on the partition board I21, the insertion pipe I22 is used for communicating the second anechoic chamber 7 with the resonant chamber 5, one end of the insertion pipe I22 extends into the second anechoic chamber 7, and the other end extends into the resonant chamber 5.
The refrigerant is gas, and the mass m of the refrigerant in the insertion tube I22 is equal toThe volume V of the resonant cavity 5 constitutes a mass spring system whose muffling frequency formula is:wherein f 0 The sound elimination frequency of the resonant cavity 5 is c is sound velocity, S is the opening area of the insertion tube I22, V is the volume of the resonant cavity 5, t is the length of the insertion tube I22, and d is the correction amount of the opening end of the insertion tube I22; from this, it can be seen that the muffling frequency f of the resonant cavity 5 0 Is related to the opening area S of the insertion tube i 22, the volume V of the resonance chamber 5, and the length t of the insertion tube i 22.
Noise elimination frequency f of resonant cavity 5 0 When the lower frequency is required to be further muffled, the partition plate I21 can be moved downwards, so that the volume V of the resonant cavity 5 is increased, or the caliber of the insertion tube I22 is reduced, namely the opening area S of the insertion tube I22 is reduced, or the length t of the insertion tube I22 is prolonged, so that the resonant cavity 5 can muffle the lower frequency. Can be based on the frequency to be muffled according to the formula of muffling frequencyThe sound of specific frequency can be damped by changing the opening area S of the insertion tube I22, the volume V of the resonant cavity 5 and the length t of the insertion tube I22.
Specifically, the connector II 4 comprises a baffle II 41 in interference fit with the lower anechoic chamber 3, the periphery of the baffle II 41 is 0.15-0.35 mm larger than the unilateral size of the matching surface of the lower anechoic chamber 3, an insertion pipe II 42 and a wavelength pipe 43 which are integrally formed with the baffle II 41 are arranged on the baffle II 41, the insertion pipe II 42 is used for communicating the first anechoic chamber 6 with the second anechoic chamber 7, the wavelength pipe 43 is positioned at one end part of the first anechoic chamber 6 and is a 1/4 wavelength pipe, the 1/4 wavelength pipe is a passive muffler, after sound waves enter the wavelength pipe 43 from the second anechoic chamber 7, the sound waves with certain frequencies are reflected back to the second anechoic chamber 7 by the closed end of the wavelength pipe 43, and the sound waves with the same frequencies in the second anechoic chamber 7 are mutually offset due to opposite phases, so that the purpose of eliminating sound waves with specific frequencies is achieved. Evaluation of waves Using Transmission lossThe silencing effect of the long tube 43 is expressed by the equation of the transmission loss of the wavelength tube 43 L is the length of the wavelength tube 43, m is the ratio of the cross-sectional area of the wavelength tube 43 to the cross-sectional area of the second acoustic cavity 7, and λ is the acoustic wave length. When->When (n is a natural number), the transmission loss of the wave tube 43 is maximized. At this time, the liquid crystal display device,resonance frequency of the wave tube 43->The higher the muffling frequency L of the wavelength tube 43, the shorter the muffling frequency L of the wavelength tube 43, and the longer the muffling frequency L. The length of the wave tube 43 is determined according to the muffling frequency band,/->L is the length of the wavelength tube 43, n is the order of the sound wave, λ is the wavelength of the sound wave, and when n=1, ">I.e. the length of the wave length tube 43 is +.>The peak value of specific middle-high frequency narrower-band noise can be weakened.
According to the invention, the baffle I21 is in interference fit with the upper silencing chamber 1, the baffle II 41 is in interference fit with the lower silencing chamber 3, so that the impact of pulsating air flow to the communicating devices I2 and II 4 is avoided to generate regenerative noise, and the interference fit around the baffle I21 also prevents sound waves from passing through the matching position with the communicating devices II 4, so that the silencing effect is good.
Specifically, the length and width of the second silencing cavity 7 and the first silencing cavity 6 are equal, the separation ratio of the second silencing cavity 7 and the first silencing cavity 6 is 0.3-0.5, namely the separation ratio H1/H of the second silencing cavity 7 and the first silencing cavity 6 is 0.3-0.5, and preferably 0.4, and because the wavelength of high-frequency noise is shorter, reflection and interference are easy to occur on a discontinuous interface, so that the purpose of noise reduction is achieved, and when the height of the second silencing cavity 7 is smaller than that of the first silencing cavity 6, the high-frequency noise with shorter wavelength is sufficiently silenced in the first silencing cavity 6; the medium-high frequency noise with longer wavelength enters the second silencing cavity 7, after the sound wave enters the wave length tube 43 from the second silencing cavity 7, the sound wave is reflected back to the second silencing cavity 7 by the closed end of the wave length tube 43, and the sound wave with specific frequency and the sound wave with the same frequency in the second silencing cavity 7 are mutually counteracted due to opposite phases, so that silencing of the medium-high frequency noise sound wave with specific frequency is realized; the low-frequency noise sound wave with longer wavelength enters the resonant cavity 5 to carry out noise elimination on noise in a specific lower frequency band, so that the frequency range of noise elimination is increased, the transmission loss of more frequency bands can be obtained, and the noise elimination and noise reduction effect is better.
In addition, be provided with the induction port 31 that is linked together with first sound-damping chamber 6 on wherein down the sound-damping chamber 3, be provided with the gas outlet 11 that is linked together with second sound-damping chamber 7 on going up the sound-damping chamber 1, go up the port department of sound-damping chamber 1 and the port department joint cooperation of lower sound-damping chamber 3, go up sound-damping chamber 1 port circumference and be provided with the ring channel promptly, lower sound-damping chamber 3 port circumference is provided with the boss with the ring channel joint, go up sound-damping chamber 1's port department and set up welding wire circle 8, make sound-damping chamber and lower sound-damping chamber 3 joint back seal welding link to each other, the structural strength of whole muffler has been improved.
The oil leakage hole I44 is formed in the communicating device II 4, the oil leakage hole II 32 opposite to the oil leakage hole I44 is formed in the bottom of the lower silencing chamber 3, the oil baffle 33 is arranged on the lower silencing chamber 3 at the bottom of the oil leakage hole II 32, and because the refrigerant and the refrigerating machine oil are completely mutually dissolved, when the refrigerant is sucked into each silencing cavity, the oil is also brought into each silencing cavity, because the density of the oil is large, when the silencing cavities pass through more and more refrigerant, more oil can be brought into the silencing cavities to form oil drops with larger mass, finally the oil drops fall to the bottom of the lower silencing chamber 3 through the oil leakage hole I44, the oil drops are discharged outwards from the oil leakage hole II 32 on the lower silencing chamber 3 and are guided outwards through the oil baffle 33, and the refrigerating machine oil cannot be sucked into the lower silencing chamber 3 again through the oil leakage hole II 32, so that the refrigerating machine oil is prevented from entering the compressor system through the air outlet 11 of the upper silencing chamber 1, and the faults such as valve plate damage caused by wet compression and compressor blockage and noise caused by impurities are avoided in the compression process.
Example 1
As shown in fig. 3 to 5, in the compressor muffler of the above-described structure, the separation ratio of the second muffler chamber 7 and the first muffler chamber 6 is 0.3, the length of the first muffler chamber 6 is 63mm, the width is 25mm, the height is 45mm, the length of the second muffler chamber 7 is 63mm, the width is 25mm, the height is 13.5mm, the length of the corrugated tube is 20mm, and the opening area S of the insertion tube i 22 is 12.56mm 2 The volume V of the resonant cavity 5 is 1920mm 3 The length t of the insertion tube I22 is 6mm.
Example 2
The difference from embodiment 1 is that the separation ratio of the second sound-deadening chamber 7 to the first sound-deadening chamber 6 is 0.4, the height of the first sound-deadening chamber 6 is 42mm, and the height of the second sound-deadening chamber 7 is 16.8mm.
Example 3
The difference from embodiment 1 is that the separation ratio of the second sound-deadening chamber 7 to the first sound-deadening chamber 6 is 0.5, the height of the first sound-deadening chamber 6 is 40mm, and the height of the second sound-deadening chamber 7 is 20mm.
Comparative example 1
The difference from embodiment 1 is that the separation ratio of the second sound-deadening chamber 7 to the first sound-deadening chamber 6 is 0.25, the height of the first sound-deadening chamber 6 is 48mm, and the height of the second sound-deadening chamber 7 is 12mm.
Comparative example 2
The difference from embodiment 1 is that the separation ratio of the second sound-deadening chamber 7 to the first sound-deadening chamber 6 is 0.55, the height of the first sound-deadening chamber 6 is 38mm, and the height of the second sound-deadening chamber 7 is 20.9mm.
Comparative example 3
As shown in FIG. 1, in the muffler of the related art, the volume of the first expansion chamber is 8726mm 3 The volume of the second expansion chamber is 10423mm 3 A first expansion chamberThe "through-air" bottom between the second expansion chambers had a width of 27mm and a height of 30mm.
As shown in fig. 6 and 7, the abscissa is frequency f/Hz, the ordinate is transmission loss TL/dB, and simulation graphs of the relationship between frequency and transmission loss are obtained after modeling the silencers in the above examples 1 to 3 and comparative examples 1 to 3 in LMS virtual. The invention increases the volume of each stage of silencing cavity, sets the separation ratio of the second silencing cavity 7 and the first silencing cavity 6, increases the wavelength tube 43, the resonant cavity 5 and the like, and compared with the prior art, the silencing range is wider, and the silencing effect is obviously improved in each high frequency range.
Comparing the simulation diagrams of examples 1 to 3 and comparative examples 1 and 2, it can be seen that when the separation ratio of the second sound-deadening chamber 7 to the first sound-deadening chamber 6 is 0.4, the sound-deadening effects of the high frequency bands 1000 to 2000Hz,2300 to 2800Hz are best, and the noises of these two high frequency bands are most common among the sound-deadening devices, and when the separation ratio of the second sound-deadening chamber 7 to the first sound-deadening chamber 6 is 0.25 and 0.55, the transmission losses of the high frequency bands 1000 to 2000Hz are equivalent to the transmission losses of the separation ratios of 0.3, 0.4 and 0.5, and the transmission losses of the high frequency bands 2300 to 2800Hz are significantly lower than the transmission losses of the separation ratios of 0.3, 0.4 and 0.5, and therefore, when the separation ratio of the second sound-deadening chamber 7 to the first sound-deadening chamber 6 is 0.3 to 0.5, the sound-deadening effects of the high frequency bands are better, especially when the separation ratio is 0.4.
Example 4
The manufacturing process of the compressor muffler comprises the following steps:
step 1: and (5) material feeding inspection: including the detection of the type, weight and water content of the raw materials.
Step 2: drying the raw materials: and (3) baking the PBT granules for 4-5 hours at the temperature of 130-140 ℃ by using a baking oven, and fully drying and softening the PBT granules.
Step 3: heating the baked raw materials in a sectional manner: the baked PBT granules enter an injection molding machine barrel from a charging barrel, the injection molding machine barrel is sequentially provided with a heating section I, a heating section II, a heating section III, a heating section IV and a heating section V along the injection molding direction, the PBT granules are subjected to gradient heating along the injection molding direction, the heating temperature is 250 ℃, 270 ℃, 290 ℃, 305 ℃, the heating temperature near a nozzle is 305 ℃, the heating proportion is 68%, the heating time is 18s, and the PBT granules are heated to be in a molten state.
Step 4: injection molding of the muffler assembly: sequentially injecting an upper silencing chamber 1, a communicating device I2, a lower silencing chamber 3 and a communicating device II 4, and cooling and demoulding after injection.
The injection molding method of the muffler assembly is as follows: 1) When injection molding is started, the pressure applied to the molten material at the top of the screw of the injection molding machine is 80MPa, the injection flow rate is 38g/s, the pressure maintaining is carried out when the mass (volume) of the molten material in the injection molding machine reaches 15% of the initial position, the pressure maintaining pressure is 42MPa, the injection flow rate is 12g/s, and the pressure maintaining time is 15s. 2) After the pressure maintaining is finished, cooling is carried out for 10 seconds, and demoulding is carried out.
Step 5: assembling a muffler assembly: according to the size of the silencing frequency, the communicator I2 is pressed at a position set in the upper silencing chamber 1, so that the communicator I2 is in interference fit with the upper silencing chamber 1; the communicating device II 4 is pressed and assembled at a position set in the lower silencing chamber 3, so that the communicating device II 4 is in interference fit with the lower silencing chamber 3, and the separation ratio of the formed second silencing cavity 7 and the first silencing cavity 6 is 0.4.
Step 6: welding muffler assembly: the welding wire ring 8 is placed in the upper silencing chamber 1, the ports of the upper silencing chamber 1 and the lower silencing chamber 3 are in butt joint connection, then the ports of the upper silencing chamber 1 and the lower silencing chamber 3 are welded through a high-frequency welding machine, and the high-frequency welding temperature is 250-270 ℃ and the welding time is 4-7 s.
Step 7: and (3) carrying out quality inspection on the silencer forming part:
tensile strength test: and (3) pulling the upper silencing chamber 1 and the lower silencing chamber 3 by using a tensile strength tester with a tensile force of 180-210N, and after maintaining for 4 seconds, finding that no crack defect exists at a welding line, wherein the welding strength is qualified.
And (3) pipeline unblocking inspection: the air with the pressure of 0.35MPa is introduced into the air suction port 31 of the muffler, the air outlet pressure of 0.3MPa is detected at the air outlet 11, and the pipeline is smooth.
Step 8: packaging and warehousing.
The performance of the muffler assembly obtained by the above process was tested to obtain: the uniformity of the wall thickness of the upper anechoic chamber 1 is 90-93%, and the molding shrinkage is 1.6-2.3%; the uniformity of the wall thickness of the lower anechoic chamber 3 is 91-93%, and the molding shrinkage is 1.7-2.1%.
Example 5
The difference from example 4 is that: the injection molding method of the muffler assembly is as follows: 1) When injection molding is started, the pressure applied to the molten material at the top of the screw of the injection molding machine is 90MPa, the injection flow rate is 38g/s, the pressure maintaining is carried out when the mass (volume) of the molten material in the injection molding machine reaches 15% of the initial position, the pressure maintaining pressure is 46MPa, the injection flow rate is 12g/s, and the pressure maintaining time is 15s. 2) After the pressure maintaining is finished, cooling is carried out for 10 seconds, and demoulding is carried out.
Further testing the performance of the muffler assembly obtained by the above process, resulted in: the uniformity of the wall thickness of the upper silencing chamber 1 is 95-97%, and the molding shrinkage rate is 1.4-1.5%; the uniformity of the wall thickness of the lower anechoic chamber 3 is 95-98%, and the molding shrinkage is 1.3-1.5%.
It is clear from examples 4 and 5 that when the injection pressure is low, it is inconvenient to drive the molten material of the barrel into the cavity of the mold, so that the molten material is fully contacted with the cavity, and because of a certain injection proportion, after most of the molten material is driven into the cavity, the wall thickness of the basic molding and silencing cavity has a certain deviation due to objective space position and temperature distribution of the mold, such as low pressure, and it is inconvenient to fill the wall thickness. Therefore, the wall thickness of the muffler is unevenly distributed, the sound insulation effect of a thin place is poor, the heat insulation effect is poor, and the muffler is easy to exchange heat with the refrigerant collected by the shell, so that the refrigerating capacity is reduced. Through increasing injection pressure, the PBT melting material of being convenient for spreads the mould, and whole mould face has full of PBT melting material, under certain pressurize condition, makes PBT melting material flow well with the mould face, and abundant melting makes whole silencer wall thickness even unanimous, and it is effectual to insulate against heat, sound insulation, fall the noise, and increase injection pressure makes the compactness of PBT goods increase moreover, and the heat shrinkage rate reduces, and elasticity is replied and is increased to make shaping shrinkage rate reduce.
Example 6
The difference from example 4 is that: the injection molding method of the muffler assembly is as follows: 1) When injection molding is started, the pressure applied to the molten material at the top of the screw of the injection molding machine is 90MPa, the injection flow rate is 40g/s, the pressure maintaining is carried out when the mass (volume) of the molten material in the injection molding machine reaches 15% of the initial position, the pressure maintaining pressure is 46MPa, the injection flow rate is 16g/s, and the pressure maintaining time is 2s. 2) After the pressure maintaining is finished, cooling for 10s, and demoulding;
detecting the performance of the muffler assembly to obtain: the uniformity of the wall thickness of the upper silencing chamber 1 is 96-98%, and the molding shrinkage rate is 1-1.3%; the uniformity of the wall thickness of the lower anechoic chamber 3 is 97-99%, and the molding shrinkage is 1-1.2%.
According to the embodiment 4 and the embodiment 6, the PBT melting material is convenient to spread the die by increasing the injection flow, the PBT melting material flows well on the die surface under a certain pressure maintaining condition, the thickness of the whole silencer wall is uniform and consistent, the heat insulation, sound insulation and noise reduction effects are good, and the increase of the injection flow is equivalent to the increase of the injection rate, so that the material temperature is reduced slowly, the pressure transmission and the pressure maintaining are facilitated, and the molding shrinkage rate is reduced.
Comparative example 4
The difference from example 5 is that: when the mass (volume) of the melt in the injection molding machine reached 5% of the initial position, the pressure was maintained at 46MPa, the injection flow rate was 12g/s, and the dwell time was 15s.
Detecting the performance of the muffler assembly to obtain: the uniformity of the wall thickness of the upper silencing chamber 1 is 76-86%, and the molding shrinkage rate is 2.5-4.8%; the uniformity of the wall thickness of the lower anechoic chamber 3 is 78-84%, and the molding shrinkage is 2.8-3.6%.
Comparative example 5
The difference from example 4 is that: when the mass (volume) of the melt in the injection molding machine reached 30% of the initial position, the pressure was maintained at 46MPa, the injection flow rate was 12g/s, and the dwell time was 15s.
Detecting the performance of the muffler assembly to obtain: the uniformity of the wall thickness of the upper anechoic chamber 1 is 72-83%, and the molding shrinkage is 3.2-5.4%; the uniformity of the wall thickness of the lower anechoic chamber 3 is 75-86%, and the molding shrinkage is 4.1-6.2%.
Therefore, it is apparent from examples 5, 4 and 5 that the time at which the pressure maintaining starts has a great influence on the uniformity of the wall thickness of the anechoic chamber and the molding shrinkage, and that when the mass (volume) of the melt in the injection molding machine reaches 10 to 20% of the initial position, the uniformity of the wall thickness of the obtained product is 90 to 100% and the molding shrinkage is 1 to 2.3% at a certain injection pressure, pressure maintaining pressure and injection flow rate. When the ratio of the mass of the molten material in the injection molding machine to the mass of the initial position is smaller than 10%, more molten material is injected into the mold due to the smaller amount of the molten material in the injection molding machine, the amount of the molten material participating in pressure maintaining is smaller, the molten material cannot rebound fully, the wall thickness uniformity and the molding shrinkage of the product are reduced, and when the ratio of the mass of the molten material in the injection molding machine to the mass of the initial position is larger than 20%, the amount of the molten material in the injection molding machine is larger, only less molten material is injected into the mold, the pressure of the later injection molding cannot be reached, and the wall thickness uniformity and the molding shrinkage of the product are reduced.
In conclusion, the preparation process of the muffler is standardized, so that the preparation period and the preparation cost of a finished product can be reduced by simple steps, the quality of the finished product is improved, and the performance index of the muffler can be improved; meanwhile, by changing the structure of the existing muffler, the range of the noise elimination frequency can be enlarged, and the noise elimination and noise reduction effects are improved.
The foregoing is provided by way of illustration of the principles of the present invention, and is not intended to be limited to the specific constructions and applications illustrated herein, but rather to all modifications and equivalents which may be utilized as fall within the scope of the invention as defined in the claims.
Claims (8)
1. The manufacturing process of the muffler of the compressor is characterized by comprising the following steps of:
step 1: roasting the injection molding solid raw materials and then putting the injection molding solid raw materials into a charging barrel of an injection molding machine; step 2: the baked raw materials enter an injection molding machine barrel from a charging barrel to be heated in sections, and the raw materials are heated to a molten state; step 3: when injection molding is started, the pressure applied to the molten material by the top of the screw of the injection molding machine is 80-100 MPa, the injection flow is 36-40 g/s, the pressure is maintained when the mass of the molten material in the injection molding machine reaches 10-20% of the initial position, the pressure is 42-50 MPa, the injection flow is 8-16 g/s, and the pressure maintaining time is 10-20 s; step 4: injection molding the muffler component according to the methods of the step 1 and the step 2, cooling, demolding, assembling and welding to form; step 5: performing quality inspection on the silencer forming part; step 6: packaging and warehousing;
the injection molding machine barrel in the step 2 is sequentially provided with a heating section I, a heating section II, a heating section III, a heating section IV and a heating section V along the injection molding direction, wherein the temperature of the heating section I is 240-260 ℃, the temperature of the heating section II is 260-280 ℃, the temperature of the heating section III is 280-300 ℃, the temperature of the heating section IV is 295-315 ℃, the heating section V is positioned at a nozzle of the injection molding machine barrel, the temperature of the heating section V is 295-315 ℃, the heating proportion of the heating section V is 50-70%, and the heating time of the heating section V is 10-20 s;
the uniformity of the wall thickness of the silencer component obtained by injection molding according to the methods of the step 1 and the step 2 is 90-100%, and the molding shrinkage rate is 1-2.3%.
2. The process for manufacturing a muffler for a compressor according to claim 1, wherein: the injection molding solid raw material is set to be PBT granules, the baking temperature of the PBT granules is 130-140 ℃, and the baking time is 4-5 hours.
3. The process for manufacturing a muffler for a compressor according to claim 1, wherein: and welding the muffler assembly by adopting a high-frequency welding machine, wherein the high-frequency welding temperature is 250-270 ℃, and the welding time is 4-7 s.
4. The process for manufacturing a muffler for a compressor according to claim 1, wherein: the quality inspection of the sound eliminator forming part in the step 5 comprises tensile strength inspection and pipeline smoothness inspection, wherein the tensile strength inspection method comprises the steps of adopting 180-210N tensile force, maintaining for 4 seconds, and if no crack defect exists at a welding line, judging that the welding strength is qualified, otherwise, judging that the welding strength is unqualified; the pipeline unblocking inspection method is that gas with the pressure of 0.35MPa is introduced into an air suction port of the muffler, if the gas outlet is detected to have the gas outlet pressure of 0.28-0.35 MPa, the pipeline is unblocked, and if the gas outlet is detected to have the gas outlet pressure of less than 0.28MPa, the pipeline is blocked and is unqualified.
5. A compressor muffler, employing the manufacturing process according to any one of claims 1 to 4, characterized in that: the device comprises an upper silencing chamber, a communicating device I, a lower silencing chamber and a communicating device II, wherein the upper silencing chamber is connected with the communicating device I to form a resonant cavity, the lower silencing chamber is connected with the communicating device II and then is welded with the upper silencing chamber to form a first silencing cavity and a second silencing cavity which are communicated with the resonant cavity, and the volume of the second silencing cavity close to the resonant cavity is smaller than that of the first silencing cavity.
6. The compressor muffler of claim 5, wherein: the connector I comprises a partition board I in interference fit with the upper anechoic chamber, an insertion pipe I integrally formed with the partition board I is arranged on the partition board I, and the insertion pipe I is communicated with the second anechoic chamber and the resonance chamber.
7. The compressor muffler of claim 5, wherein: the connector II comprises a partition board II in interference fit with the lower silencing chamber, an insertion pipe II and a wavelength pipe are arranged on the partition board II, the insertion pipe II is integrally formed with the partition board II, the first silencing cavity and the second silencing cavity are communicated with each other, the wavelength pipe is positioned at one end part of the first silencing cavity and is sealed, the length L=lambda/4 of the wavelength pipe is lambda of silencing frequency band wavelength; the separation ratio of the second silencing cavity to the first silencing cavity is 0.3-0.5.
8. The compressor muffler of claim 5, wherein: the lower silencing chamber is provided with an air suction port communicated with the first silencing cavity, and the upper silencing chamber is provided with an air outlet communicated with the second silencing cavity;
the port of the upper silencing chamber is matched with the port of the lower silencing chamber in a clamping way and is connected with the port of the lower silencing chamber in a sealing and welding way through a welding wire ring;
an oil leakage hole I is formed in the connector II, an oil leakage hole II opposite to the oil leakage hole I is formed in the bottom of the lower silencing chamber, and an oil baffle plate is arranged on the lower silencing chamber at the bottom of the oil leakage hole II;
the inner walls of the upper silencing chamber and the lower silencing chamber are in uniform transition and have the same wall thickness.
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| CN108915997A (en) * | 2018-08-24 | 2018-11-30 | 珠海格力节能环保制冷技术研究中心有限公司 | Silencer, compressor assembly and refrigerator |
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| CN201818348U (en) * | 2010-07-30 | 2011-05-04 | 广西柳工机械股份有限公司 | Hydraulic muffler for excavator |
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