Silencer

Abstract

The utility model relates to a silencer which comprises an upper shell and a lower shell which are sealed, and a first silencing cavity and a second silencing cavity are formed in the lower shell. A communicating channel is arranged between the upper shell and the lower shell and communicates with the first silencing cavity and the second silencing cavity. An air inlet channel and a silencing channel are arranged in the lower shell; the air inlet channel penetrates through the exterior of the lower shell and the silencing channel; and the upper shell and the lower shell are connected in an involution sealing manner. The included angle air inlet channel and the noise reduction channel are designed, and a partition plate is arranged between the first noise reduction cavity and the second noise reduction cavity, so that air can be subjected to noise reduction twice; an air inlet channel and a silencing channel are arranged in the silencer, so that the purpose of reducing the size of the silencer is achieved; therefore, the silencer provided by the utility model has the advantages of miniaturization and good noise elimination effect.

Description

Technical Field

[0001] The utility model belongs to the field of refrigeration equipment, and specifically relates to a silencer. Background Art

[0002] A compressor is a machine that boosts low-pressure gas into high-pressure gas as a driven fluid. It sucks in low-temperature and low-pressure refrigerant gas from the suction pipe, compresses it by driving a piston through the operation of an electric motor, and then discharges the high-temperature and high-pressure refrigerant gas to the exhaust pipe to provide power for the refrigeration cycle. A silencer is provided inside the compressor to reduce the noise during suction. In existing compressors, the silencers used inside are restricted by space and have a small volume, resulting in poor noise absorption effect. For example, in the comparative document CN209943038U, it includes an upper shell and a lower shell that are hermetically joined up and down. The lower shell is provided with a mating groove that is recessed upward, and the length extension direction of the mating groove is in the front-back direction of the through-component. The utility model in this comparative document has a small size and can meet the requirements of miniaturization of the compressor, but this comparative document cannot take into account both the miniaturized design and good silencing function at the same time. Summary of the Utility Model

[0003] In order to solve the problem that a miniaturized silencer cannot have a good noise reduction function, the utility model provides a silencer that combines a miniaturized design with a good silencing function.

[0004] A silencer includes a sealed upper shell and a lower shell. A first silencing cavity and a second silencing cavity are provided in the lower shell; a communication channel is provided between the upper shell and the lower shell, and the communication channel is respectively communicated with the first silencing cavity and the second silencing cavity; an air inlet channel and a silencing channel are provided inside the lower shell; the air inlet channel penetrates through the outside of the lower shell and the silencing channel. Both the first silencing cavity and the second silencing cavity play a role in silencing the noise; the communication pipe enables the gas to enter the second silencing cavity from the first silencing cavity; when the gas enters the silencing channel from the air inlet channel, the silencing channel can play a role in changing the sound propagation direction, and the sound wave is absorbed and reflected in the silencing channel, and the silencing channel plays a role in noise reduction; thus, the noise of the gas entering the inside of the lower shell is overall reduced, and it has a good silencing effect; the air inlet channel and the silencing channel are directly provided in the lower shell, canceling the complex external air inlet design, which can reduce the overall volume of the device, simplify the structure of the device, and reduce the number of components.

[0005] Preferably, the silencing channel is provided in the lower shell, and the silencing channel and the air inlet channel are arranged at a certain angle. There is an angle between the air inlet channel and the silencing channel, so when the gas enters the device from the air inlet channel and passes through the silencing channel, the propagation direction of the gas changes, and the propagation direction of the sound wave also changes. The silencing channel reflects and absorbs the sound wave, thereby playing a role in noise reduction and silencing.

[0006] Preferably, the included angle between the air inlet duct and the sound absorption duct is 45° to 135°. The sound absorption duct changes the propagation paths of the gas and the sound wave, restricts the diffusion direction and amplitude of the sound wave, and further reduces the propagation of noise.

[0007] Preferably, the upper housing and the lower housing are hermetically connected in an abutting manner.

[0008] Preferably, the upper housing is provided with an upper concave upper groove on the contact surface with the lower housing, and the lower housing is provided with an upper convex lower rib on the contact surface; the upper groove and the lower rib are adaptively inserted; an induction welding wire is clamped between the bottom of the upper groove and the top of the lower rib; the upper housing and the lower housing cooperate to form a communication channel. By connecting in this way, a good sealing purpose between the upper housing and the lower housing can be achieved, thus ensuring a good sound absorption effect; the upper housing and the lower housing are abutted to form a communication channel, and the communication channel plays a role in connecting the first sound absorption cavity and the second sound absorption cavity, which is directly formed by abutting, simplifies the structure of the device, and reduces the number of components.

[0009] Preferably, high-frequency induction welding is suitable for use between the upper housing and the lower housing.

[0010] Preferably, a communication channel is provided between the upper housing and the lower housing, and the communication channel connects the first chamber and the second chamber. The communication channel connects the first sound absorption cavity and the second sound absorption cavity, and the gas can be sound-absorbed twice.

[0011] Preferably, the first sound absorption cavity and the second sound absorption cavity are isolated by a partition board, and the upper housing is provided with a partition board installation groove for the partition board. The partition board divides the interior of the present utility model into a first sound absorption cavity and a second sound absorption cavity; when the gas enters the first sound absorption cavity, the partition board can sound-absorb the gas once; when it enters the second sound absorption cavity, the partition board can also sound-absorb the gas once; the partition board installation groove determines the position of the partition board and limits the volume ratio of the first sound absorption cavity and the second sound absorption cavity.

[0012] Preferably, through oil drain holes are provided at the bottom surfaces of the first sound absorption cavity and the second sound absorption cavity in the lower housing; the lower surface of the lower housing is inclined towards the oil drain holes. The bottom of the lower housing is in an inclined shape, which is beneficial for the oil liquid inside the lower housing to flow out through the oil drain holes, providing cleaner gas for the compressor; it can also ensure that the cavity volumes of the first sound absorption cavity and the second sound absorption cavity remain unchanged, ensure that the resonance frequency in the sound absorption cavity is basically stable, and continuously play a sound absorption role.

[0013] Preferably, a filter screen installation groove is provided on the upper housing, and a filter screen is installed inside the filter screen installation groove; an air outlet hole is provided in the upper housing; the gas flows to the air outlet hole through the filter screen. The filter screen installation groove fixes the position of the filter screen, and the filter screen can filter out the impurities mixed in the gas, preventing the impurities from entering the compressor through the air outlet hole and avoiding the situation where the compressor cannot work properly, which is beneficial to extending the service life of the product and ensuring the stability and reliability of the compressor during operation.

[0014] The beneficial effects of the present invention are: an included angle air inlet passage and a sound absorption passage are designed, and a partition is provided between the first sound absorption cavity and the second sound absorption cavity, so that the gas can be sound-absorbed twice; the inside of the muffler is provided with an air inlet passage and a sound absorption passage, achieving the purpose of reducing the volume of the muffler; thus, the present invention is a muffler that takes into account miniaturization and good noise reduction effect. Brief Description of the Drawings

[0015] Figure 1 It is the front view of the present invention.

[0016] Figure 2 It is the left view of the present invention.

[0017] Figure 3 It is the sectional view taken along A-A of the middle part of the present invention.

[0018] Figure 4 It is the sectional view taken along B-B of the middle part of the present invention.

[0019] Wherein: 1. Upper housing; 2. Lower housing; 3. Induced welding wire; 4. Filter screen; 5. Air inlet passage; 6. Partition; 7. Air outlet; 8. First sound absorption cavity; 9. Second sound absorption cavity; 10. Sound absorption passage; 11. Communication channel; 12. Oil drain hole; 13. Filter screen installation groove; 14. Partition installation groove. Detailed Description of the Invention

[0020] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0021] Embodiment 1:

[0022] As shown in the specification appendix Figures 1 to 4A muffler as shown in the figure includes a sealed upper housing 1 and a lower housing 2. A first muffling chamber 8 and a second muffling chamber 9 are arranged in the lower housing; a communication channel 11 is arranged between the upper housing and the lower housing, and the communication channel is respectively communicated with the first muffling chamber and the second muffling chamber; an air inlet channel 5 and a muffling channel 10 are arranged inside the lower housing; the air inlet channel penetrates through the outside of the lower housing and is communicated with the muffling channel. The muffling channel is arranged in the lower housing, and the muffling channel and the air inlet channel are arranged at a certain angle. The angle between the air inlet channel and the muffling channel is 90°. The upper housing and the lower housing are hermetically connected in a butting manner. The upper housing is provided with an upper concave upper groove on the contact surface with the lower housing, and the lower housing is provided with an upper convex lower rib on the contact surface; the upper groove and the lower rib are adaptively inserted; an induction welding wire 3 is clamped between the bottom of the upper groove and the top of the lower rib; the upper housing and the lower housing cooperate to form a communication channel. The first muffling chamber and the second muffling chamber are isolated by a partition 6, and the upper housing is provided with a partition mounting groove 14 for the partition. Drain holes 12 are arranged through the bottom surfaces of the first muffling chamber and the second muffling chamber in the lower housing; the lower surface of the lower housing is inclined towards the drain holes. The upper housing is provided with a filter screen mounting groove 13, and a filter screen 4 is installed inside the filter screen mounting groove; an air outlet hole 7 is arranged in the upper housing; the gas flows through the filter screen to the air outlet hole.

[0023] The gas enters from the air inlet channel 5, flows through the muffling channel 10, the propagation direction of the gas and the sound wave changes, and the sound wave is reflected due to the muffling channel; the gas flows into the first muffling chamber 8 from the muffling channel and performs the first step of muffling; through the communication channel 11 connecting the first muffling chamber and the second muffling chamber 9, the gas enters the second muffling chamber and performs secondary muffling; finally, the gas passes through the air outlet hole 7, flows through the filter screen 4 and enters the compressor.

[0024] Compared with the cross-sectional area of the muffling channel 10 communicated with the air inlet channel 5, the cross-sectional area of the first muffling chamber 8 is larger, so it can reflect the sound wave, and the reflection of the sound wave will generate transmission loss, which is beneficial to reducing the noise generated when the compressor operates.

[0025] The bottom surface of the lower housing 2 has a curvature, and the middle of the bottom is convex downward. The angle between the bottom surface and the horizontal line is 3° to 7°, that is, the positions on both sides of the lower housing are higher. Two drain holes 12 are also arranged on the bottom surface, respectively arranged on both sides of the partition, specifically one in the first muffling chamber 8 and one in the second muffling chamber 9, both located at the center position of the bottom surface, that is, the convex downward position; the oil can flow out through the drain holes to avoid polluting the gas in the cavity and provide cleaner gas for the compressor; arranging the drain holes can ensure that the cavity volume inside the first muffling chamber and the second muffling chamber remains unchanged, so as to ensure that the resonance frequency between the muffling chambers is basically stable and continuously play a muffling role.

[0026] An air inlet 5 is provided on one side of the lower shell 2, and the air inlet 5 is connected to the silencer 10, and the angle between them is 90°. When the gas enters the air inlet and flows into the silencer, the flow direction of the gas changes by 90°, and the propagation direction of the sound wave also changes due to the existence of the silencer. The sound wave is absorbed due to the change in propagation direction, which plays a role in noise reduction. At the same time, because there is an angle between the air inlet and the silencer, the flow rate of the gas is also slowed down, the energy of the air flow is consumed, and the effect of air flow pulsation is weakened, thereby reducing the disturbance of the air flow in the silencer cavity, thereby ensuring the silencer effect of the silencer. The air inlet and the silencer are both straight pipes, and the two are connected in a T-shape.

[0027] The partition 6 and the lower shell 2 are fixedly connected and formed as one piece; thereby reducing the number of parts in the device, simplifying the assembly and subsequent disassembly process steps of the silencer, effectively improving the efficiency of the assembly and disassembly of the silencer, and thereby reducing the cost of production and maintenance.

[0028] Whether to install the filter 4 can be determined according to different application environments. The filter can filter out impurities mixed in the gas, prevent impurities from entering the compressor through the air outlet, and avoid the compressor from failing to work properly. This is beneficial to extending the service life of the product and can ensure the stability and reliability of the compressor during operation.

[0029] The upper shell 1 and the lower shell 2 are directly matched to form a connecting channel, which reduces the number of required parts; the upper shell and the lower shell are designed as an integral molding, and are designed with the shape of a connecting channel 11. When the upper shell and the lower shell are sealed, a connecting channel connecting the first silencing chamber 8 and the second silencing chamber 9 is formed inside the device, which simplifies the installation steps, reduces the production cost, and ensures the processing accuracy. The position of the connecting channel is also reserved on the partition, and the position of the connecting channel is also reserved on the installation groove of the partition in the upper shell.

[0030] Embodiment 2:

[0031] As shown in Appendix 1 to 4 of the manual, Figures 1 to 4A muffler as shown includes a sealed upper housing 1 and a lower housing 2. A first muffling chamber 8 and a second muffling chamber 9 are provided in the lower housing; a communication channel 11 is provided between the upper housing and the lower housing, and the communication channel is respectively communicated with the first muffling chamber and the second muffling chamber; an air inlet channel 5 and a muffling channel 10 are provided inside the lower housing; the air inlet channel penetrates through the outside of the lower housing and is communicated with the muffling channel. The muffling channel is provided in the lower housing, and the muffling channel and the air inlet channel are arranged at a certain angle. The angle between the air inlet channel and the muffling channel is 90°. The upper housing and the lower housing are hermetically connected in a butting manner. The upper housing is provided with an upper concave upper groove on the contact surface with the lower housing, and the lower housing is provided with an upper convex lower rib on the contact surface; the upper groove and the lower rib are adaptively inserted; an induction welding wire 3 is clamped between the bottom of the upper groove and the top of the lower rib; the upper housing and the lower housing cooperate to form a communication channel. The first muffling chamber and the second muffling chamber are isolated by a partition 6, and a partition mounting groove 14 for the partition is provided on the upper housing. Through holes 12 are provided at the bottom surfaces of the first muffling chamber and the second muffling chamber in the lower housing; the lower surface of the lower housing is inclined towards the through holes 12. A filter screen mounting groove 13 is provided on the upper housing, and a filter screen 4 is installed inside the filter screen mounting groove; an air outlet hole 7 is provided in the upper housing; gas flows to the air outlet hole through the filter screen.

[0032] Sound-absorbing materials are provided inside the first muffling chamber and the second muffling chamber, thereby improving the muffling effect.

[0033] The bottom surface of the lower housing 2 has a curvature, and the middle of the bottom is convex downward. The angle between the bottom surface and the horizontal line is 5°, that is, the positions on both sides of the lower housing are higher. Two oil drain holes 12 are also provided on the bottom surface, respectively arranged on both sides of the partition. Specifically, there is one in the first muffling chamber 8 and one in the second muffling chamber 9, both located at the center position of the bottom surface, that is, the convex downward position; oil can flow out through the oil drain holes, avoiding polluting the gas in the chamber and providing cleaner gas for the compressor; setting the oil drain holes can ensure that the cavity volume inside the first muffling chamber and the second muffling chamber remains unchanged, thereby ensuring that the resonance frequency between the muffling chambers is basically stable and continuously playing a muffling role.

[0034] The sound-absorbing materials can make the noise propagating in the muffling chamber attenuate as the distance in the muffling chamber extends, thereby achieving the purpose of muffling. Among them, the sound-absorbing materials include glass fiber, low-carbon steel wire, felt, etc. High-frequency induction welding is suitable between the upper housing and the lower housing.

[0035] The lower housing 2 is directly divided into a first muffling chamber 8 and a second muffling chamber 9 by using a partition 6, such a structure is convenient for disassembly; the volumes of the first muffling chamber and the second muffling chamber can change according to the position where the partition is placed, and the resonance between the two can change according to the position of the partition; the partition and the lower housing are connected together by fasteners to form a stable connection structure.

[0036] Since the gaseous medium contains substances such as gaseous lubricating oil, the gaseous lubricating oil gradually turns into liquid lubricating oil due to cooling during the process of flowing through the muffler, and the liquid lubricating oil flows out of the muffler cavity through the oil drain hole. Specifically, the oil drain hole 12 is located at the bottom of the muffler cavity. Since each muffler cavity is provided with an oil drain hole, it can ensure that the liquid lubricating oil can flow out of the muffler through the oil drain hole. Specifically, each muffler cavity is provided with at least one oil drain hole to ensure the effectiveness and feasibility of oil drainage.

[0037] Embodiment 3:

[0038] As shown in the Figures 1 to 4 A muffler as shown in the specification appendix, including a sealed upper housing 1 and a lower housing 2. A first muffler cavity 8 and a second muffler cavity 9 are arranged in the lower housing; a communication channel 11 is arranged between the upper housing and the lower housing, and the communication channel is respectively communicated with the first muffler cavity and the second muffler cavity; an air inlet channel 5 and a muffler channel 10 are arranged inside the lower housing; the air inlet channel penetrates through the outside of the lower housing and the muffler channel. The muffler channel is arranged in the lower housing, and the muffler channel and the air inlet channel are arranged at a certain angle. The angle between the air inlet channel and the muffler channel is 90°. The upper housing and the lower housing are hermetically connected in a butting manner. The upper housing is provided with an upper concave upper groove on the contact surface with the lower housing, and the lower housing is provided with an upper convex lower rib on the contact surface; the upper groove and the lower rib are adaptively inserted; an induction welding wire 3 is clamped between the bottom of the upper groove and the top of the lower rib; the upper housing and the lower housing cooperate to form a communication channel. The first muffler cavity and the second muffler cavity are isolated by a partition plate 6, and a partition plate installation groove 14 for the partition plate is arranged on the upper housing. Through oil drain holes 12 are arranged at the bottom surfaces of the first muffler cavity and the second muffler cavity in the lower housing; the lower surface of the lower housing is inclined towards the oil drain hole. A filter screen installation groove 13 is arranged on the upper housing, and a filter screen 4 is installed inside the filter screen installation groove; an air outlet hole 7 is arranged in the upper housing; the gas flows to the air outlet hole through the filter screen.

[0039] The muffler channel communicated with the air inlet channel 5 is a serpentine pipe. The serpentine pipe can slow down the flow velocity of the gas passing through the pipe. The sound waves of the noise are reflected multiple times by the pipe wall, and the energy of the sound waves is weakened multiple times, thereby reducing the disturbance of the air flow in the muffler cavity, and thus ensuring the muffling effect of the muffler. Among them, the serpentine pipe is longer and has more bends, and the noise will be reflected multiple times and the direction of the sound wave will be changed multiple times; a sound-absorbing material is arranged in the serpentine pipe, so that the noise propagating in the muffler cavity can be attenuated as the distance in the muffler cavity increases, so as to achieve the purpose of muffling.

[0040] The angle between the air inlet channel 5 and the muffler channel 10 can also be set to 120°. According to the different sizes and shapes of the air inlet channel and the muffler channel, the installation is carried out so that the propagation path of the sound wave in the air inlet channel and the muffler channel is the farthest, so as to achieve the best muffling effect.

[0041] The inclination angle of the lower surface of the lower housing 2 towards the oil drain hole 12 is 3°. The oil carried by the incoming air will flow along the inclined direction and into the oil drain hole from the surface of the lower housing. The side surface of the lower housing is a vertical plane, which can enable the oil to slide down quickly and flow into the lower surface, so that no excess oil remains inside the muffler, and the step of cleaning the oil is also saved, reducing the workload of the staff.

[0042] Both the upper housing 1 and the lower housing 2 are integrally formed. When the installation is completed, they directly cooperate to form the communication channel 11, eliminating the need to separately provide a communication channel in the existing muffler, simplifying the installation steps and reducing the components constituting the present utility model, making the device structure simpler, production faster, and saving production costs. The integral formation ensures the sealing performance of the device, with no gap between the upper housing and the lower housing.

[0043] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present utility model.

Claims

1. A muffler, comprising a sealed upper shell (1) and a lower shell (2), characterized in that: A first silencing chamber (8) and a second silencing chamber (9) are provided in the lower shell; A communication channel (11) is provided between the upper shell and the lower shell, and the communication channel is respectively communicated with the first silencing chamber and the second silencing chamber; An air inlet passage (5) and a muffler passage (10) are provided inside the lower shell; The air inlet duct passes through the outside of the lower shell and the muffler duct.

2. The muffler according to claim 1, characterized in that: The silencer duct (10) is arranged in the lower shell body (2), and is arranged at a certain angle to the air inlet duct (5).

3. The muffler according to claim 2, characterized in that: The included angle between the air inlet duct (5) and the muffler duct (10) is 45° to 135°.

4. The muffler according to claim 1, characterized in that: The upper shell (1) and the lower shell (2) are hermetically connected.

5. The muffler according to claim 4, characterized in that: The upper shell (1) is provided with an upper concave groove on the contact surface with the lower shell (2), and the lower shell is provided with an upper convex lower convex strip on the contact surface; the upper groove and the lower convex strip are adapted to be plugged in.

6. The muffler according to claim 4, characterized in that: An induction welding wire (3) is clamped between the bottom of the upper groove and the top of the lower convex strip.

7. The muffler according to claim 4, characterized in that: The upper shell and the lower shell cooperate to form a communication channel (11).

8. The muffler according to claim 1, characterized in that: The first silencing chamber (8) and the second silencing chamber (9) are isolated by a partition (6), and a partition mounting groove (14) of the partition is provided on the upper shell (1).

9. The silencer according to any one of claims 1 to 8, characterized in that: The bottom surfaces of the first muffler chamber (8) and the second muffler chamber (9) in the lower shell (2) are both provided with through oil drain holes (12); The lower surface of the lower shell is inclined toward the oil drain hole.

10. The silencer according to any one of claims 1 to 8, characterized in that: A filter screen installation groove (13) is provided on the upper shell body, and a filter screen (4) is installed inside the filter screen installation groove; An air outlet hole (7) is provided in the upper shell; The gas passes through the filter (4) and flows to the gas outlet.

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