Low-noise compressor

Abstract

The utility model belongs to the technical field of compressors, and particularly relates to a low-noise compressor. The low-noise compressor comprises a motor, a crankcase and a connecting part, wherein the crankcase comprises a box body, a crankshaft and a plurality of cylinders for compressing gas; the box body comprises an upper bottom surface, a lower bottom surface, a first side surface, a second side surface, a third side surface and a fourth side surface, two coaxial bearing seat holes are respectively formed in the first side surface and the second side surface, an air inlet hole is formed in the upper bottom surface, and the air cylinder is arranged on the third side surface and the fourth side surface; the crankshaft is arranged in the crankcase, and one end of the crankshaft penetrates out of the bearing seat hole in the first side face and is fixedly connected with a motor shaft of the motor through a connecting part. One end of a connecting rod of the cylinder is connected with a piston in the cylinder, and the other end of the connecting rod sleeves the crankshaft to form a crank-link mechanism; a noise reduction structure used for reducing noise in the box body is arranged on the inner wall of the box body. Noise generated by the compressor can be greatly reduced, and meanwhile safety and compression efficiency of the compressor are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to compressor technical field, especially relate to a low noise compressor. BACKGROUND

[0002] Reciprocating compressor as a kind of gas pressure lifting fluid machinery, in vehicle, petroleum, chemical industry and multiple fields play very important role.But reciprocating compressor in the operation process the huge noise not only will damage the physical and mental health of operator, influence production efficiency and production quality, also to workshop, factory environment has very big negative influence.

[0003] Reciprocating compressor produces many reasons of noise, if these noise reasons are classified according to parts, then there is no doubt that crankcase is an important part of noise generation.Crankcase as one of the key components of compressor, under the participation of crankshaft, it is cooperated with coupling guard, bearing seat, connecting rod to complete motor power transmission, converts crankshaft rotary motion into connecting rod reciprocating swing, cooperates with cylinder and piston to realize reciprocating motion, completes gas compression.

[0004] Crankcase is closely interacted with other components in compressor, as the carrier of moving parts, the box structure of crankcase is closed shell, in order to reduce the noise generated by compressor, the prior art often adds the thickness of the box of crankcase to reduce the noise generated by crankcase part and reduce the noise transmitted by crankcase part, thereby reducing the noise generated by compressor.But increasing the thickness of the box of crankcase, in addition to increasing the cost of compressor, also affects the heat dissipation of crankcase, so that the pressure in crankcase increases, once because of long-term bad driving conditions or overlong maintenance cycle causes the ventilation system in crankcase to be aged or partially blocked, it will not be timely pressure relief, cause the damage of gasket and sealing element, lead to compressor lubricant leakage, further increase noise, also affect the safe use of compressor, reduce compression efficiency. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the insufficient of prior art, provide a kind of low noise compressor, while greatly reducing the noise generated by compressor, guarantee the safe use and compression efficiency of compressor.

[0006] To achieve the above object, the utility model adopts the following technical scheme:

[0007] The utility model provides a low noise compressor, including motor, crankcase and connecting portion, the crankcase includes the box, crankshaft and a plurality of cylinder for compressing gas, the box includes upper bottom, lower bottom, first side, second side, third side and fourth side, two coaxial bearing seat holes are arranged on the first side and the second side respectively, the upper bottom is provided with the air inlet hole, and the cylinder is arranged on the third side and the fourth side, the crankshaft is arranged in the crankcase, and one end of the crankshaft passes out the bearing seat hole on the first side and is fixedly connected with the motor shaft of the motor through the connecting portion, the connecting rod one end of the cylinder is connected together with the piston in the cylinder, and the connecting rod other end is sleeved on the crankshaft and constitutes the crank connecting rod mechanism, and the inner wall of the box is provided with the noise reduction structure for reducing the noise in the box.

[0008] Preferably, the noise reduction structure includes reinforcing ribs and net pattern protrusions, the reinforcing ribs and the net pattern protrusions are arranged on the inner wall of the box, the reinforcing ribs include circular reinforcing ribs and strip reinforcing ribs, the circular reinforcing ribs are arranged around the holes, the strip reinforcing ribs on the first side and the second side pass through the center of the bearing seat hole, and the upper bottom, the third side and the fourth side are all provided with a plurality of strip reinforcing ribs parallel to the length direction of the crankshaft.

[0009] Preferably, the inner wall of the box, the reinforcing ribs and the net pattern protrusions are all provided with a sound absorption layer.

[0010] Preferably, the first side is provided with a first exhaust hole and a first primary cylinder guide hole, the first exhaust hole is arranged below, above or on the side away from the air inlet hole of the first primary cylinder guide hole, the fourth side is provided with a second exhaust hole and a second primary cylinder guide hole, the second exhaust hole is arranged below, above or on the side away from the air inlet hole of the second primary cylinder guide hole, and the first primary cylinder and the second primary cylinder are fixedly arranged in the first primary cylinder guide hole and the second primary cylinder guide hole in the length direction respectively.

[0011] Preferably, the third side is also provided with a first secondary cylinder guide hole, the first secondary cylinder guide hole is arranged on the side away from the air inlet hole of the first exhaust hole, the fourth side is also provided with a second secondary cylinder guide hole, the second secondary cylinder guide hole is arranged on the side close to the air inlet hole of the second primary cylinder guide hole, and the first secondary cylinder and the second secondary cylinder are fixedly arranged in the first secondary cylinder guide hole and the second secondary cylinder guide hole in the length direction respectively.

[0012] Preferably, the compressor further comprises a cooling part for reducing the temperature of the compressed gas, the cooling part being provided with a first-stage gas inlet end, a first-stage gas outlet end, a second-stage gas inlet end and a compressed gas outlet; the first-stage cylinder is connected to the exhaust hole on the corresponding side through the first-stage gas inlet pipe, and the first-stage cylinder is connected to the first-stage gas inlet end of the cooling part through the first-stage gas outlet pipe; the second-stage cylinder is connected to the first-stage gas outlet end of the cooling part through the second-stage gas inlet pipe, and the second-stage cylinder is connected to the second-stage gas inlet end of the cooling part through the second-stage gas outlet pipe.

[0013] Preferably, the gas feeding pipe extends into the box from the outside of the box through the gas inlet hole; the first-stage gas inlet pipe and the second-stage gas inlet pipe extend into the box from the outside of the box through the first exhaust hole and the second exhaust hole on the corresponding side, and the outer diameters of the pipes are the same as the diameters of the corresponding gas inlet hole or exhaust hole.

[0014] Preferably, a plane parallel to the upper bottom surface and perpendicular to the third side and passing through the center of the first first-stage cylinder guide hole is referred to as a first plane, a plane parallel to the upper bottom surface and perpendicular to the third side and passing through the center of the first second-stage cylinder guide hole is referred to as a second plane, a plane parallel to the upper bottom surface and perpendicular to the fourth side and passing through the center of the second first-stage cylinder guide hole is referred to as a third plane, and a plane parallel to the upper bottom surface and perpendicular to the fourth side and passing through the center of the second second-stage cylinder guide hole is referred to as a fourth plane, wherein the first plane and the second plane do not coincide, and the third plane and the fourth plane do not coincide.

[0015] Preferably, the cooling part comprises a first heat exchanger and a second heat exchanger; one end of the first heat exchanger is the first-stage gas inlet end, and the other end of the first heat exchanger is the first-stage gas outlet end; one end of the second heat exchanger is the second-stage gas inlet end, and the other end of the second heat exchanger is the compressed gas outlet; the second heat exchanger is fixedly arranged on the upper surface of the first heat exchanger, the first-stage gas outlet end is located directly below the compressed gas outlet, and the first-stage gas outlet end is located directly below the second-stage gas inlet end.

[0016] Preferably, the cooling part further comprises a fan, the other end of the crankshaft passes through the bearing seat hole on the second side and is fixedly connected with the fan blade shaft of the fan; the crankcase is located on the air inlet side of the fan, and the first heat exchanger and the second heat exchanger are located on the air outlet side of the fan.

[0017] The beneficial effects of the utility model lie in:

[0018] (1) The low-noise compressor can not only greatly reduce the noise generated by the compressor during operation, but also can safely and efficiently compress the gas and prolong the service life of the compressor.

[0019] (2) The crankcase in the low-noise compressor does not need to increase the thickness of the box body, the air inlet hole and the air outlet hole are arranged on the box body, the positions of the air inlet hole and the air outlet hole on the box body are limited, the two airflow directions in the box body are formed, heat in the box body and compressed gas leaked from the cylinder can be taken out of the box body in time in the working process, the air pressure and the temperature in the box body are always suitable and heat is dissipated in time, the safe operation of the compressor and the efficient compression of air are guaranteed, and the service life of the crankcase is also prolonged.

[0020] (3) The compressor as a whole has low noise, which is due to the fact that the crankcase in the compressor has good noise reduction effect, which is mainly embodied in the following aspects:

[0021] ① The eccentric design of the cylinder hole reduces the lateral force applied to the cylinder by the piston and reduces the noise generated when the crankcase assembly moves.

[0022] ② The inner wall of the box body is provided with a noise reduction structure including a reinforcing rib and a net pattern protrusion, and the noise reduction structure is provided with a sound absorbing layer, compared with the prior art of increasing the thickness of the crankcase as a whole, the noise reduction structure and the setting mode thereof in the utility model have very small space requirement, so the volume of the crankcase does not need to be increased and the internal rotation area will not be compressed, the space utilization rate in the crankcase is improved, the space occupied by the compressor is avoided to be increased, and the weight of the box body of the utility model is only slightly increased, but the strength and rigidity of the box body of the crankcase are greatly enhanced, and the noise generated by the crankcase and the noise transmitted from the crankcase are greatly reduced.

[0023] ③ The air supply pipe extends to the inner cavity of the box body from the outside of the box body through the air inlet hole, the first-stage air inlet pipe and the second-stage air inlet pipe extend to the inner cavity of the box body from the outside of the box body through the first air outlet hole and the second air outlet hole respectively, the air supply pipe, the first-stage air inlet pipe and the second-stage air inlet pipe and the box body are equivalent to two series of plug-in pipe type expansion chamber silencers in the propagation process of external noise, and the noise reduction structure provided with the sound absorbing layer and the inner wall of the box body make the whole inner cavity of the box body become a resistive silencer. That is, the utility model not only sets the box body into a resistive silencer on the basis of the expansion chamber silencer formed by the crankcase, the air supply pipe and the air inlet pipe, but also avoids the resonance of the crankcase leading to the increase of noise, and in the process of noise wave propagation in the box body, sound energy will be converted into heat energy due to friction, so that noise will attenuate with the propagation distance, and the heat generation in the friction process in the silencing process will be taken out of the box body by the airflow, so that the utility model of the crankcase can not only prevent external noise from being transmitted from the crankcase, but also ensure that the air pressure and temperature in the box body of the crankcase are always suitable.

[0024] (4) Compared with setting the first heat exchanger and the second heat exchanger separately in the cooling section, in order to prevent the ice blockage at the compressed gas outlet and the first-stage outlet in winter, two heaters need to be set separately. However, the way the first heat exchanger and the second heat exchanger are set in this utility model makes full use of the heat of the high-temperature first-stage compressed gas, while reducing the cooling burden of the first heat exchanger and ensuring the working efficiency of the compressor, achieving two goals at once.

[0025] (5) In the cooling section of this utility model, the fan blades are driven to rotate by the crankshaft. That is, during the operation of the compressor, the fan can be started without additional power supply to the fan to cool the first heat exchanger and the second heat exchanger, thereby improving the cooling efficiency of the cooling section. This arrangement makes the entire compressor structure compact and maximizes the space utilization.

[0026] (6) In this utility model, an air guide shroud is provided between the fan outlet side and the first heat exchanger and the second heat exchanger, which can reduce the situation of the fan outlet air escaping to the surroundings, further improve the cooling efficiency of the cooling section, and improve the working efficiency of the compressor.

[0027] (7) In this utility model, setting the gas-liquid separator on the secondary intake pipe can effectively improve the compression efficiency of the secondary cylinder and extend the compressor life. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the crankcase;

[0029] Figure 2 This is the front view of the crankcase;

[0030] Figure 3 This is a rear view of the crankcase;

[0031] Figure 4 This is the left view of the crankcase;

[0032] Figure 5 This is a top view of the crankcase;

[0033] Figure 6 This is a bottom view of the crankcase;

[0034] Figure 7 for Figure 5 AA section view in the middle;

[0035] Figure 8 for Figure 5 BB section view in the middle;

[0036] Figure 9 for Figure 2 CC section view in the middle;

[0037] Figure 10It is a schematic view of the rotating area in the crankcase.

[0038] Figure 11 It is a schematic view of the net convex;

[0039] Figure 12 It is Figure 7 The enlarged schematic view of F in it;

[0040] Figure 13 It is Figure 8 The enlarged schematic view of G in it;

[0041] Figure 14 It is Figure 9 The enlarged schematic view of H in it;

[0042] Figure 15 It is the first schematic view of the overall structure of the low-noise compressor;

[0043] Figure 16 It is the second schematic view of the overall structure of the low-noise compressor;

[0044] Figure 17 It is the third schematic view of the overall structure of the low-noise compressor;

[0045] Figure 18 It is the rear view of the low-noise compressor.

[0046] The actual corresponding relationship between the various labels and component names of the utility model is as follows:

[0047] 001, motor; 002, crankcase; 003, connecting part; 004, air filter; 005, cooling part; 006, gas-liquid separator;

[0048] 1, bearing seat hole;

[0049] 2, box body;

[0050] 31, first exhaust hole; 32, first primary cylinder guide hole;

[0051] 41, second exhaust hole; 42, second primary cylinder guide hole;

[0052] 5, air inlet hole;

[0053] 61, first secondary cylinder guide hole; 62, second secondary cylinder guide hole;

[0054] 7, top mounting hole; 71, first top mounting hole; 72, second top mounting hole;

[0055] 9, bottom mounting hole;

[0056] 101, reinforcing rib; 102, net convex;

[0057] 005a, first heat exchanger; 005b, second heat exchanger; 005c, fan; 005d, heater; 005e, air deflector. DETAILED DESCRIPTION

[0058] In order to make the technical scheme of the utility model more clear and explicit, the utility model is described clearly and completely below in combination with the drawings, and the technical features of the technical scheme of the utility model obtained by equivalent replacement and routine inference of the ordinary skilled in the art without creative labor fall within the protection scope of the utility model.

[0059] As shown in the figure, it is a low-noise compressor overall structure schematic diagram at three different angles, wherein Figures 15 to 17 is the angle from the upper left to the lower right of the low-noise compressor, Figure 15 is the angle from the upper right to the lower left of the low-noise compressor, Figure 16 is the low-noise compressor overall structure schematic diagram at the angle of looking up, Figure 17 is the low-noise compressor overall structure schematic diagram at the angle of looking up. Figure 18 is the rear view of the low-noise compressor.

[0060] A low-noise compressor, comprising a motor 001, a connecting part 003, a crankcase 002 and a cooling part 005.

[0061] Figure 1 is the low-noise compressor overall structure schematic diagram, Figures 2 to 6 is the various views of the crankcase, wherein Figure 4 is the left view of the crankcase, and the right view of the crankcase is the same as Figure 4 .

[0062] The crankcase 002 comprises a box body 2, a crankshaft and one or more than one cylinder. The box body 2 is a hexahedron, two opposite sides of which are respectively provided with bearing seat holes 1, the two bearing seat holes 1 are coaxially arranged, the box body 2 is provided with a crankshaft, one end of the crankshaft passes out of the bearing seat hole 1 and is fixedly connected with one end of the connecting part 003, and the other end of the connecting part 003 is connected with a motor shaft of the motor 001. The sides of the box body 2 where the two bearing seat holes 1 are located are respectively recorded as a first side and a second side.

[0063] Start the motor 001, the motor shaft in the motor 001 rotates, and drives the crankshaft in the box body 2 to rotate through the connecting part 003.

[0064] The connecting part 003 comprises a shaft coupling and a shaft coupling cover, the shaft coupling is arranged inside the shaft coupling cover, and the two ends of the shaft coupling are respectively connected with the crankshaft and the motor shaft. Figures 15 to 16 Only the shaft coupling cover can be seen, and the shaft coupling in the shaft coupling cover is not separately drawn.

[0065] Optionally, the coupling in the connecting part 003 is an elastic coupling, which can adjust different shaft errors caused by assembly of the motor shaft and the crankshaft, reduce vibration caused by different shafts, and ensure smooth transmission of driving force to the crankshaft.

[0066] The upper bottom surface of the box body 2 is provided with a top mounting hole 7 and an air inlet hole 5, and the lower bottom surface of the box body 2 is provided with a bottom mounting hole 9.

[0067] In the embodiment, the top mounting hole 7 includes a first top mounting hole 71 and a second top mounting hole 72, and the specific number of the top mounting hole 7 is not limited to the utility model.

[0068] After the installation of the crankshaft and the cylinder and other components in the box body 2 is completed, the top mounting hole 7 and the bottom mounting hole 9 are closed by a cover plate to prevent dust from entering, and further avoid the noise in the box body 2 from being transmitted to the outside of the box body 2 through the top mounting hole 7 and the bottom mounting hole 9. Figures 15 to 18 In the embodiment, the top mounting hole 7 and the bottom mounting hole 9 are closed.

[0069] In addition to the first side and the second side, the box body 2 further includes a third side and a fourth side arranged oppositely, and the third side is provided with a first exhaust hole 31 and a first primary cylinder guide hole 32.

[0070] Optionally, the first exhaust hole 31 is arranged directly below the first primary cylinder guide hole 32 or directly above the first primary cylinder guide hole 32, or on a side of the first primary cylinder guide hole 32 away from the air inlet hole 5.

[0071] Optionally, the third side is further provided with a first secondary cylinder guide hole 61.

[0072] Optionally, the first secondary cylinder guide hole 61 is arranged on a side of the first exhaust hole 31 away from the air inlet hole 5.

[0073] Optionally, the fourth side is provided with a second exhaust hole 41 and a second primary cylinder guide hole 42.

[0074] Optionally, the second exhaust hole 41 is arranged directly below the second primary cylinder guide hole 42 or directly above the second primary cylinder guide hole 42, or on a side of the second primary cylinder guide hole 42 away from the air inlet hole 5.

[0075] Optionally, the fourth side is further provided with a second secondary cylinder guide hole 62.

[0076] Optionally, the second secondary cylinder guide hole 62 is arranged on a side of the second primary cylinder guide hole 42 close to the air inlet hole 5.

[0077] Optionally, the distance between the bearing seat hole 1 and the first exhaust hole 31, or the distance between the bearing seat hole 1 and the second exhaust hole 41, is the closest or farthest distance between the bearing seat hole 1 and the air inlet hole 5.

[0078] Optionally, the outer surface of the box 2 where the bearing seat hole 1, the first exhaust hole 31, the first primary cylinder guide hole 32, the second exhaust hole 41, the second primary cylinder guide hole 42, the air inlet hole 5, the first secondary cylinder guide hole 61, the second secondary cylinder guide hole 62, the top mounting hole 7, and the bottom mounting hole 9 are located are partially thickened. Because the local strength of the box 2 is reduced after the holes are opened, the deformation at the opening position will increase when stressed, and the local thickening can reduce the deformation at the opening position and avoid excessive stress at the opening position due to excessive stress. If not thickened, the opening position may be damaged due to fatigue under continuous action.

[0079] In this embodiment, there are two levels of cylinders, two primary cylinders, and two secondary cylinders. The diameter of the secondary cylinder is smaller than that of the primary cylinder.

[0080] The first primary cylinder is fixedly arranged in the first primary cylinder guide hole 32 along its length direction, i.e., a part of the first primary cylinder is located in the inner cavity of the box 2, and the other part is located outside the box 2. The second primary cylinder is fixedly arranged in the second primary cylinder guide hole 42 along its length direction, the first secondary cylinder is fixedly arranged in the first secondary cylinder guide hole 61 along its length direction, and the second secondary cylinder is fixedly arranged in the second secondary cylinder guide hole 62 along its length direction.

[0081] In the box 2, one end of the connecting rod of each cylinder is connected to the piston in the cylinder, and the other end is sleeved on the crankshaft to form a crank connecting rod mechanism. The motor 001 outside the box 2 drives the crankshaft to rotate after being energized, and the crank connecting rod mechanism converts the rotary motion of the crankshaft into the reciprocating linear motion of the connecting rod, driving the piston in the cylinder to also perform reciprocating linear motion, and the air in the cylinder is compressed.

[0082] The cooling part 005 is provided with a primary air inlet end, a primary air outlet end, a secondary air inlet end, and a compressed gas outlet.

[0083] The cylinder head of each cylinder is located outside the box 2.

[0084] The cylinder head of each primary cylinder is connected to the exhaust hole on the corresponding side through a primary intake pipe, i.e. the cylinder head of the first primary cylinder is connected to the first exhaust hole 31 on the third side through a primary intake pipe, and the cylinder head of the second primary cylinder is connected to the second exhaust hole 41 on the fourth side through a primary intake pipe. The cylinder head of each primary cylinder is also connected to the primary intake end of the cooling part 005 through a primary exhaust pipe, i.e. the cylinder head of the first primary cylinder is also connected to the primary intake end of the cooling part 005 through a primary exhaust pipe, and the cylinder head of the second primary cylinder is also connected to the primary intake end of the cooling part 005 through a primary exhaust pipe.

[0085] The primary intake end includes more than one intake port.

[0086] In this embodiment, the primary intake end includes two intake ports, which are respectively connected to two different primary exhaust pipes.

[0087] The primary exhaust end of the cooling part 005 is connected to the cylinder head of each secondary cylinder through a secondary intake pipe, i.e. the primary exhaust end of the cooling part 005 is connected to the cylinder head of the first secondary cylinder and the cylinder head of the second secondary cylinder through a secondary intake pipe.

[0088] Optionally, the secondary intake pipe is provided with a gas-liquid separator 006.

[0089] The cylinder head of each secondary cylinder is also connected to the secondary intake end of the cooling part 005 through a secondary exhaust pipe, i.e. the cylinder head of the first secondary cylinder is also connected to the secondary intake end of the cooling part 005 through a secondary exhaust pipe, and the cylinder head of the second secondary cylinder is also connected to the secondary intake end of the cooling part 005 through a secondary exhaust pipe.

[0090] The secondary intake end includes more than one intake port.

[0091] In this embodiment, the secondary intake end also includes two intake ports, which are respectively connected to two different secondary exhaust pipes.

[0092] The intake hole 5 is connected to the external environment through a gas delivery pipe.

[0093] Optionally, the intake hole 5 can also be connected to an air filter 004 through a gas delivery pipe outside the box 2, and the air filter 004 inhales and filters the air in the external environment.

[0094] The primary cylinder and the secondary cylinder on the same side have opposite piston movement directions.

[0095] Taking air as an example, the air at normal temperature and pressure in the environment enters the inside of the box 2 from the intake hole 5 after being filtered by the air filter 004. The air filter 004 can improve the purity of the air, filter out the dust in the air, and prolong the service life of the compressor.

[0096] When each primary cylinder is inhaling, the air at normal temperature and pressure in the box 2 flows out from each air outlet hole, flows into the corresponding primary cylinder through the primary air inlet pipe, is compressed into high-temperature primary compressed gas in the primary cylinder, and then flows out from the primary air outlet pipe. The high-temperature primary compressed gas has higher temperature and pressure than the air at normal temperature and pressure. After the high-temperature primary compressed gas enters the cooling part 005 through the primary air inlet end of the cooling part 005, it is cooled and becomes low-temperature primary compressed gas. The low-temperature primary compressed gas flows out from the primary air outlet end of the cooling part 005. In this embodiment, the high-temperature primary compressed gas flowing out from the first primary cylinder and the second primary cylinder is mixed and equalized in pressure before being cooled in the cooling part 005.

[0097] The temperature of the low-temperature primary compressed gas is much lower than that of the high-temperature primary compressed gas, but the pressure of the low-temperature primary compressed gas is basically the same as that of the high-temperature primary compressed gas.

[0098] The low-temperature primary compressed gas flowing out from the primary air outlet end of the cooling part 005 flows into the secondary air inlet pipe, becomes dry low-temperature primary compressed gas after flowing through the gas-liquid separator 006, and then enters each secondary cylinder. After the high-temperature primary compressed gas is cooled and cooled in the cooling part 005, some water vapor is separated out, so the low-temperature primary compressed gas carries water vapor. If the low-temperature primary compressed gas carrying water vapor directly enters the secondary cylinder for a long time, the service life of the compressor will be shortened, and the compression efficiency of the secondary cylinder will be reduced. The gas-liquid separator 006 arranged on the secondary air inlet pipe can effectively improve the compression efficiency of the secondary cylinder and prolong the service life of the compressor.

[0099] When each secondary cylinder is inhaling, the dry low-temperature primary compressed gas enters the corresponding secondary cylinder through the secondary air inlet pipe, is compressed into high-temperature secondary compressed gas in the secondary cylinder, and then flows out from the secondary air outlet pipe. The high-temperature secondary compressed gas has higher temperature and pressure than the low-temperature primary compressed gas. After the high-temperature secondary compressed gas enters the cooling part 005 through the secondary air inlet end of the cooling part 005, it is cooled and becomes low-temperature secondary compressed gas. The low-temperature secondary compressed gas flows out from the compressed gas outlet of the cooling part 005.

[0100] In this embodiment, the high-temperature secondary compressed gas flowing out from the first secondary cylinder and the second secondary cylinder is mixed and equalized in pressure before being cooled in the cooling part 005.

[0101] In this embodiment, the secondary air inlet pipe at the outlet of the gas-liquid separator 006 is in the form of a three-way pipe.

[0102] The temperature of the low-temperature secondary compressed gas is much lower than that of the high-temperature secondary compressed gas, but the pressure of the low-temperature secondary compressed gas is basically the same as that of the high-temperature secondary compressed gas.

[0103] The low-temperature secondary compressed gas is stored for standby or is used to provide power for a pneumatic production device.

[0104] In the low-noise compressor, for the same side, when the primary cylinder inhales, the secondary cylinder compresses gas and discharges high-temperature secondary compressed gas; when the primary cylinder compresses gas and discharges high-temperature primary compressed gas, the secondary cylinder inhales; the above process is repeated to complete two-stage compression of the gas.

[0105] After the crankshaft, the cylinder and other components are installed into the crankcase, all the holes of the crankcase are in a sealed state except the air inlet hole 5 and the first and second exhaust holes 31 and 41. However, the compressed gas in the cylinder will enter the crankcase 2 along the inner wall of the piston and the cylinder body. If the air inlet hole 5 and the first and second exhaust holes 31 and 32 are also sealed, the temperature and pressure in the crankcase will gradually increase, which not only reduces the viscosity of the lubricant on the crankshaft, thereby reducing the lubrication performance and increasing the wear of the crankshaft and related components, but also accelerates the oxidation and carbonization of the lubricant due to the increase in the temperature in the crankcase, thereby further increasing the wear of the crankshaft and related components and directly affecting the gas compression efficiency of the compressor. Even when the temperature and pressure in the crankcase are too high, the risk of explosion of the crankcase is also increased.

[0106] Therefore, the air inlet hole 5 and the first and second exhaust holes 31 and 41 are formed on the crankcase 2 of the crankcase 002, the air supply pipe extends into the inner cavity of the crankcase 2 from the outside of the crankcase 2 through the air inlet hole 5, the primary and secondary air inlet pipes extend into the inner cavity of the crankcase 2 from the outside of the crankcase 2 through the first and second exhaust holes 31 and 41, respectively, the outer diameters of all the pipes are the same as the diameters of the corresponding air inlet / exhaust holes, and all the pipes are sealed at the corresponding air inlet holes or exhaust holes. The inner cavity of the crankcase 2 is in a negative pressure relative to the atmospheric environment outside the crankcase 2, and the normal-temperature gas enters the inner cavity of the crankcase 2 from the air inlet hole 5 and is discharged from the first or second exhaust hole 31 or 41, thereby maintaining the negative pressure in the inner cavity of the crankcase 2 and removing the heat in the inner cavity of the crankcase 2. Even if the compressed gas in the cylinder enters the crankcase 2 along the inner wall of the piston and the cylinder body, the temperature and pressure in the crankcase 2 will not increase.

[0107] After the technical personnel's many experiments, the crankcase box 002 of the utility model makes special limitation on the position setting of the intake hole and the exhaust hole: relative to the same bearing seat hole 1, the spacing between the intake hole 5 and the bearing seat hole 1 is minimum or maximum, in order to facilitate the description, taking the minimum spacing between the intake hole 5 and the same bearing seat hole 1 as an example: the first exhaust hole 31 on the third side is closer to the intake hole 5 relative to the second exhaust hole 41 on the fourth side, then the airflow direction in the box 2 has two kinds: ① flowing into the box 2 from the intake hole 5, and then flowing out from the first exhaust hole 31, ② flowing into the box 2 from the intake hole 5, and then flowing out from the second exhaust hole 41.

[0108] For the first airflow direction, the first secondary cylinder guide hole 61 is arranged on the side of the first exhaust hole 31 away from the intake hole 5, the first exhaust hole 31 is arranged directly below the first primary cylinder guide hole 32 or directly above the first primary cylinder guide hole 32, or on the side of the first primary cylinder guide hole 32 away from the intake hole 5; therefore, on the third side, according to the order from near to far to the intake hole 5, the first exhaust hole 31 and the first primary cylinder guide hole 32 are arranged in parallel, then the first secondary cylinder guide hole 61; or the first primary cylinder guide hole 32, then the first exhaust hole 31, and finally the first secondary cylinder guide hole 61; or the first primary cylinder guide hole 32, then the first secondary cylinder guide hole 61, and finally the first exhaust hole 31. For the second airflow direction, the second secondary cylinder guide hole 62 is arranged on the side of the second primary cylinder guide hole 42 close to the intake hole 5, the second exhaust hole 41 is arranged directly below the second primary cylinder guide hole 42 or directly above the second primary cylinder guide hole 42, or on the side of the second primary cylinder guide hole 42 away from the intake hole 5; therefore, on the fourth side, according to the order from near to far to the intake hole 5, the second secondary cylinder guide hole 62, then the second exhaust hole 41 and the second primary cylinder guide hole 42; or the second secondary cylinder guide hole 62, then the second primary cylinder guide hole 42, and finally the second exhaust hole 41.

[0109] Therefore, the crankcase 002 in the utility model can guarantee that the heat and the compressed gas leaked from the cylinder are taken out of the crankcase 2 efficiently, so that the air pressure and temperature in the crankcase 2 are always suitable, and the safe operation of the compressor and the efficient compression of air are further guaranteed.

[0110] There are mainly two types of reasons for the noise generated in the crankcase: pneumatic noise and mechanical noise. The pneumatic noise is mainly the noise generated by the gas flow and gas leakage, for example, the pneumatic noise is generated at the gas valve on the cylinder or the crankcase, and the pneumatic noise enters the crankcase 2 through the cylinder guide hole and the air inlet hole and the exhaust hole, and for example, the pneumatic noise is also generated when the airflow flows through the crankcase 2. The mechanical noise is mainly the noise generated by mechanical collision and mechanical friction, for example, the mechanical noise is generated by the piston and the cylinder during the movement of the piston, or the mechanical noise is generated by the crankshaft driving the crank connecting rod mechanism during the rotation of the crank connecting rod mechanism; and for example, the precision control is performed on the crankcase, a single component, so that there is an unsuitable tolerance between the crankcase and the bearing seat and other components, and under the cumulative tolerance, the original single size tolerance of the crankcase is affected by the tolerance of multiple components, so that the original design tolerance and the actual assembly tolerance are seriously mismatched, which indirectly affects the positional relationship of the friction pairs, so that the friction pairs are unevenly worn, the local wear is increased, and the mechanical noise is also increased. Whether the pneumatic noise or the mechanical noise in the crankcase is transmitted from the crankcase to the outside.

[0111] Optionally, a plane parallel to the upper bottom surface and perpendicular to the third side and passing through the center of the first primary cylinder guide hole 32 is recorded as a first plane; a plane parallel to the upper bottom surface and perpendicular to the third side and passing through the center of the first secondary cylinder guide hole 61 is recorded as a second plane; a plane parallel to the upper bottom surface and perpendicular to the fourth side and passing through the center of the second primary cylinder guide hole 42 is recorded as a third plane; and a plane parallel to the upper bottom surface and perpendicular to the fourth side and passing through the center of the second secondary cylinder guide hole 62 is recorded as a fourth plane; the first plane and the second plane are not coincident, and the third plane and the fourth plane are not coincident.

[0112] For the convenience of description, this case is called eccentric design of cylinder bore, the eccentric design of cylinder bore in the utility model can indeed reduce the lateral force applied by the piston to the cylinder, not only prolongs the service life of the friction pair between the cylinder and the piston, but also effectively reduces the noise generated when the crankcase assembly moves. Subsequent comparison tests by technical personnel confirmed that the crankcase 002 with eccentric design of cylinder bore and the compressor in which the crankcase is located have smaller noise in use under the condition that other specifications of the crankcase 002 are unchanged.

[0113] In the inner cavity of the box body 2, as shown in the sectional view, Figures 7 to 9 , the inner wall of the box body 2 is provided with a noise reduction structure, which comprises a reinforcing rib 101 and a mesh protrusion 102. For the convenience of viewing and distinguishing from the sectional view, only the reinforcing rib 101 is drawn in the sectional view of Figures 7 to 9 , and the mesh protrusion 102 is not drawn; the mesh protrusion 102 is shown in the enlarged schematic view of F, G and H, i.e. Figures 12 to 14 , and the mesh protrusion enlarged schematic view as shown in Figure 11 . In Figures 12 to 14 , the mesh protrusion is represented by two different sizes of grids, because the large grid represents the mesh protrusion 102 provided on the inner wall of the box body, and the small grid represents the mesh protrusion 102 provided on the reinforcing rib 101. In the drawings of the utility model, only for the convenience of viewing, but the grids represented by the grids are mesh protrusions 102.

[0114] In this embodiment, the box body 2 is a hexahedron, in the space rectangular coordinate system, the upper and lower bottom surfaces of the box body 2 are located in the X-axis direction; the length direction of the crankshaft is located in the Z-axis direction, i.e. the side surface on which the two bearing seat holes 1 are located is located in the Z-axis direction; the third side surface and the fourth side surface on which the two cylinder guide holes are located are oppositely arranged and located in the Y-axis direction.

[0115] The reinforcing rib 101 is fixedly arranged on the inner wall of the box body 2, and the reinforcing rib 101 comprises a circular reinforcing rib and a strip-shaped reinforcing rib. The circular reinforcing rib is arranged around each hole, and the extension line of the strip-shaped reinforcing rib on the side surface on which the two bearing seat holes 1 are located will pass through the center of the bearing seat hole 1. In addition, a plurality of strip-shaped reinforcing ribs parallel to the length direction of the crankshaft are arranged on the side surface on which the two bearing seat holes 1 are located. The circular reinforcing rib makes the position of the inner surface of the box body 2 corresponding to each hole locally thickened, i.e. the inner surface and the outer surface of the box body 2 corresponding to each hole on the box body 2 are locally thickened. The reinforcing rib 101 is made of aluminum alloy.

[0116] The mesh protrusion 102 is arranged on the inner wall of the box body 2 without the reinforcing rib 101. The mesh in the mesh protrusion 102 can be diamond-shaped, circular, etc., and the mesh shape is not limited to the utility model.

[0117] Optionally, the mesh protrusion 102 is also arranged on the reinforcing rib 101.

[0118] Optionally, the sound-absorbing material is sprayed on the inner wall of the box body 2, the reinforcing rib 101 and the net-shaped protrusion 102 to form a sound-absorbing layer. In the embodiment, the sound-absorbing material is a Teflon composite sound-absorbing material.

[0119] In the embodiment, the height h1 of the reinforcing rib 101 is less than or equal to 5 mm, and the height h2 of the net-shaped protrusion 102 is less than or equal to 2 mm.

[0120] The noise reduction structure of the utility model is arranged on the inner wall of the box body 2, and the noise reduction structure comprises the reinforcing rib 101 and the net-shaped protrusion 102. When the reinforcing rib 101 is arranged alone, the structural strength and rigidity of the box body 2 can be increased. When the net-shaped protrusion 102 is arranged alone, the local strength and rigidity of the position arranged in the box body 2 can be increased. It is found through multiple detections and tests of technical personnel that the strength and rigidity of the position of the reinforcing rib 101 are further increased, the local strength and rigidity of the position of the net-shaped protrusion 102 around the reinforcing rib 101 are also further increased, and the overall structural strength and rigidity of the box body 2 are greatly improved. Furthermore, part of the high-frequency noise is directly absorbed by the sound-absorbing layer, and the noise reduction structure sprayed with the sound-absorbing material and the inner wall of the box body 2 make the whole inner cavity of the box body 2 become a resistive sound-absorbing part. Not only is the noise increase caused by the resonance of the crankcase 002 avoided, but also the noise sound wave will be converted into heat energy due to friction during the propagation process in the box body 2, so that the noise will be attenuated with the propagation distance, achieving the effect of reducing noise. At the same time, the heat generated in the sound-absorbing process will be taken out of the crankcase 002 by the airflow from the exhaust hole.

[0121] The inside of the box body 2 is shown as Figure 10 a middle rectangle from the side of the bearing seat hole 1, Figure 10 and the middle circular area is a rotation area which must be left for the rotation movement of the crankshaft and other components. The air supply pipe and the air inlet pipe extending into the inside of the box body 2 are both outside the rotation area (i.e. the shadow area). Compared with the prior art of thickening the whole crankcase, the prior art not only greatly increases the weight of the crankcase, but also can only increase the volume of the crankcase to ensure that the rotation area in the crankcase is not compressed. This directly leads to the further increase of the volume of the compressor equipped with the crankcase, and the increase of the space occupied by the compressor. The noise reduction structure and the arrangement method thereof in the utility model have very small space requirements, so the volume of the box body 2 does not need to be increased and the rotation area inside the box body 2 will not be compressed, improving the space utilization rate in the box body 2 and avoiding the increase of the space occupied by the compressor. Moreover, the resistive sound-absorbing part in the box body 2 of the utility model only slightly increases the weight of the crankcase 002, but greatly enhances the strength and rigidity of the box body of the crankcase 002, greatly reduces the noise generated by the crankcase 002 and the noise transmitted from the crankcase 002, and greatly reduces the overall noise of the compressor. The noise reduction structure in the utility model also saves the amount of materials and reduces the manufacturing cost compared with the prior art.

[0122] The one end of the air delivery pipe is connected with the outside environment or the air filter 004, and the other end of the air delivery pipe extends to the inside of the box 2, and the one end of each air inlet pipe also extends to the inside of the box 2, and the other end of each air inlet pipe is connected to the cylinder head of the compressor cylinder, the noise generated by other parts of the compressor mainly enters the box 2 from the one end of the air inlet pipe connected to the cylinder head along the air inlet pipe, and then is transmitted to the air along the air delivery pipe, in this process, the noise entering the crankcase belongs to the noise in the crankcase, and the noise transmitted from the crankcase belongs to the noise transmitted from the crankcase, although they are not actually generated in the crankcase 002 and transmitted, in order to facilitate description, the noise of the propagation path is recorded as extraneous noise. Because the cross-sectional area of the inside of the box 2 in any direction is greater than or equal to the circumferential cross section of the air delivery pipe or the air inlet pipe, and the change of the cross-sectional area is abrupt, the structural acoustic impedance is changed, so that the reflection and interference of the sound wave are generated, so the air delivery pipe, the air inlet pipe and the box 2 in the propagation process of the extraneous noise are equivalent to two series of internal tube type expansion chamber mufflers (air inlet pipe→inside of the box 2, inside of the box 2→air delivery pipe), that is, on the basis of the box 2, the air delivery pipe and the air inlet pipe forming the expansion chamber muffler, the inside of the box 2 is also provided with a resistive noise reduction part, which can well prevent the extraneous noise from being transmitted from the inside of the box 2.

[0123] The skilled person compares the effects of the prior art crankcase and the crankcase 002 of the utility model in various aspects while keeping the total volume of the crankcase unchanged, the prior art crankcase reduces noise by thickening the crankcase body, the crankcase 002 of the utility model is provided with a noise reduction structure reinforcing rib and a sound absorbing layer, so that the weight increase of the crankcase 002 of the utility model is-11% compared with the prior art crankcase, the stiffness increase is-0.12%, and the noise reduction of the crankcase 002 around is 10.56% under the same working condition. It can be seen that the crankcase 002 of the utility model greatly reduces the weight and noise of the crankcase while keeping the same stiffness compared with the prior art crankcase, and the manufacturing cost is saved.

[0124] The crankcase 002 of the utility model does not need to increase the thickness of the box 2, sets the air inlet hole and the air outlet hole on the box 2 and limits the positions of the air inlet hole and the air outlet hole on the box, and makes the heat in the box 2 and the compressed gas leaked from the cylinder be taken out of the box 2 in time in the working process, so that the air pressure and temperature in the box 2 are always suitable and heat dissipation is timely, air is compressed efficiently, and the service life of the crankcase 002 is prolonged.

[0125] Therefore, the crankcase 002 of the utility model will not cause the case 2 to be in the case of excessive pressure, and the damage and oil leakage of the gasket and the sealing element caused by the excessive pressure in the case 2 are avoided.

[0126] The compressor has low overall noise, and the crankcase 002 has good noise reduction effect, which is mainly embodied in the following aspects:

[0127] ①The eccentric design of the cylinder hole reduces the lateral force applied to the cylinder by the piston and reduces the noise generated when the crankcase assembly moves.

[0128] ②The inner wall of the box body 2 is provided with a noise reduction structure including a reinforcing rib 101 and a net pattern protrusion 102, and the noise reduction structure is provided with a sound absorbing layer. Compared with the prior art of thickening the crankcase as a whole, the noise reduction structure and the setting mode thereof in the utility model have very small space requirement, so the volume of the crankcase does not need to be increased and the internal rotation area is not compressed, the space utilization rate in the crankcase is improved, the space occupied by the compressor is avoided to be increased, and the weight of the box body 2 of the utility model is only slightly increased, but the box body strength and rigidity of the crankcase 002 are greatly enhanced, and the noise generated by the crankcase 002 and the noise transmitted from the crankcase 002 are greatly reduced.

[0129] ③The air supply pipe extends into the inner cavity of the box body 2 from the outside of the box body 2 through the air inlet hole 5, the first-stage air inlet pipe and the second-stage air inlet pipe extend into the inner cavity of the box body 2 from the outside of the box body 2 through the first exhaust hole 31 and the second exhaust hole 41 respectively, and the air supply pipe, the first-stage air inlet pipe and the second-stage air inlet pipe and the box body 2 are equivalent to two series-connected plug-in pipe type expansion chamber silencers in the propagation process of external noise. The noise reduction structure provided with the sound absorbing layer and the inner wall of the box body 2 make the entire inner cavity of the box body 2 become a resistive sound absorbing part. That is, the utility model is based on the expansion chamber silencer formed by the crankcase, the air supply pipe and the air inlet pipes, and the inner cavity of the box body 2 is also set as a resistive sound absorbing part. Not only is the noise increase caused by the resonance of the crankcase avoided, but also the noise sound wave is converted into heat energy due to friction during the propagation process in the box body 2, so that the noise attenuates with the propagation distance. The timely heat dissipation function of the box body of the utility model crankcase 002 can also ensure that the friction heat generated during the sound absorbing process is taken out of the inner cavity of the box body 2 by the airflow from the exhaust hole, so that the utility model crankcase can not only prevent external noise from being transmitted from the crankcase 002, but also ensure that the air pressure and temperature in the box body of the crankcase 002 are always suitable.

[0130] The cooling part 005 includes a first heat exchanger 005a and a second heat exchanger 005b. One end of the first heat exchanger 005a is a first-stage air inlet end, and the other end is a first-stage air outlet end. The first-stage air inlet end and the first-stage air outlet end are oppositely arranged, and the temperature of the first-stage air outlet end is lower than that of the first-stage air inlet end. One end of the second heat exchanger 005b is a second-stage air inlet end, and the other end is a compressed gas outlet. The second-stage air inlet end and the compressed gas outlet are oppositely arranged, and the temperature of the compressed gas outlet is lower than that of the second-stage air inlet end.

[0131] Optionally, as Figure 18As shown, the second heat exchanger 005b is fixedly arranged on the upper surface of the first heat exchanger 005a, the first-stage gas inlet end is located directly below the compressed gas outlet, and the first-stage gas outlet end is located directly below the second-stage gas inlet end. The second heat exchanger 005b will be cooled due to the high-temperature secondary compressed gas, so that water vapor or liquid droplets are generated at the compressed gas outlet, and in cold winter, the water vapor or liquid droplets at the compressed gas outlet are prone to condense into ice, causing ice blocking at the compressed gas outlet, reducing the discharge efficiency of the low-temperature secondary compressed gas, reducing the working efficiency of the compressor, and further increasing the gas pressure in the flow channel of the second heat exchanger 005b, reducing the safety of the second heat exchanger 005b. In the utility model, the gas inlet directions of the flow channels in the two heat exchangers arranged above and below are 180 degrees, the first-stage gas outlet end is located directly below the second-stage gas inlet end, and the temperature of the high-temperature first-stage compressed gas is much higher than that of the low-temperature secondary compressed gas. Therefore, the high-temperature first-stage compressed gas can heat the compressed gas outlet, avoid ice blocking at the compressed gas outlet, and ensure the working efficiency of the compressor.

[0132] In the embodiment, the first heat exchanger 005a and the second heat exchanger 005b are both plate-fin heat exchangers.

[0133] Optionally, the first-stage gas outlet end of the first heat exchanger 005a is further provided with a heater 005d. In winter, the heater 005d can be started according to actual needs, so as to avoid ice blocking at the first-stage gas outlet end.

[0134] Compared with separately arranging the first heat exchanger 005a and the second heat exchanger 005b, in order to prevent ice blocking at the compressed gas outlet and the first-stage gas outlet end in winter, two heaters need to be arranged respectively. However, the arrangement mode of the first heat exchanger 005a and the second heat exchanger 005b in the utility model fully utilizes the heat of the high-temperature first-stage compressed gas, and at the same time, reduces the cooling burden of the first heat exchanger 005a, achieving two goals at once.

[0135] Optionally, the cooling part 005 further comprises a fan 005c, one end of a crankshaft penetrates through the first side surface and is fixedly connected with one end of the connecting part 003 outside the box body 2, the other end of the crankshaft penetrates through the second side surface and is fixedly connected with a fan blade shaft of the fan 005c, the crankshaft box 002 is located on the air inlet side of the fan 005c, and the first heat exchanger 005a and the second heat exchanger 005b are located on the air outlet side of the fan 005c. That is, the fan blades of the fan 005c are driven to rotate by the crankshaft, that is, during the working process of the compressor, the fan 005c can be started without additional power supply, so as to air cool the first heat exchanger 005a and the second heat exchanger 005b, improve the cooling efficiency of the cooling part 005, and maximize the space utilization rate.

[0136] Optionally, a wind deflector 005e is arranged between the fan 005c and the first heat exchanger 005a and the second heat exchanger 005b, which can reduce the situation that the air outlet of the fan 005c is scattered to the surroundings, and further improve the cooling efficiency of the cooling part 005.

[0137] In conclusion, the low-noise compressor can not only greatly reduce the noise generated by the compressor during operation, but also safely and efficiently compress the gas and prolong the service life of the compressor.

[0138] The technical, shape and structure parts not described in detail in the utility model are all known technologies.

[0139] The above is only a preferred embodiment of the utility model creation, and is not used to limit the utility model creation, and any modification, equivalent replacement and improvement within the spirit and principles of the utility model creation should be included in the protection scope of the utility model creation.

Claims

1. A low-noise compressor, comprising a motor (001), a crankcase (002), and a connecting part (003), characterized in that: The crankcase (002) includes a housing (2), a crankshaft, and several cylinders for compressing gas. The housing (2) includes an upper bottom surface, a lower bottom surface, a first side surface, a second side surface, a third side surface, and a fourth side surface. Two coaxial bearing seat holes (1) are respectively provided on the first side surface and the second side surface. An air inlet hole (5) is provided on the upper bottom surface. The cylinders are provided on the third side surface and the fourth side surface. The crankshaft is provided inside the crankcase (002). One end of the crankshaft passes through the bearing seat hole (1) on the first side surface and is fixedly connected to the motor shaft of the motor (001) through a connecting part (003). One end of the connecting rod of the cylinder is connected to the piston inside the cylinder, and the other end of the connecting rod is sleeved on the crankshaft to form a crank-connecting rod mechanism. A noise reduction structure for reducing noise inside the housing is provided on the inner wall of the housing (2).

2. A low-noise compressor according to claim 1, characterized in that: The noise reduction structure includes reinforcing ribs (101) and textured protrusions (102), both of which are set on the inner wall of the housing (2). The reinforcing ribs (101) include two types: circular reinforcing ribs and strip reinforcing ribs. The circular reinforcing ribs are arranged around each hole. The extension lines of the strip reinforcing ribs on the first and second sides pass through the center of the bearing seat hole (1). Several strip reinforcing ribs parallel to the length direction of the crankshaft are provided on the top surface, the third side and the fourth side.

3. A low-noise compressor according to claim 2, characterized in that: The inner wall of the enclosure (2), the reinforcing ribs (101) and the textured protrusions (102) are all provided with sound-absorbing layers.

4. A low-noise compressor according to claim 1, characterized in that: The third side has a first exhaust port (31) and a first stage cylinder guide hole (32). The first exhaust port (31) is located directly below, directly above, or on the side of the first stage cylinder guide hole (32) away from the air inlet (5). The fourth side has a second exhaust port (41) and a second stage cylinder guide hole (42). The second exhaust port (41) is located directly below, directly above, or on the side of the second stage cylinder guide hole (42) away from the air inlet (5). The first stage cylinder and the second stage cylinder are fixedly installed in the first stage cylinder guide hole (32) and the second stage cylinder guide hole (42) in their respective length directions.

5. A low-noise compressor according to claim 4, characterized in that: The third side is also provided with a first and second stage cylinder guide hole (61), which is located on the side of the first exhaust hole (31) away from the intake hole (5); the fourth side is also provided with a second and second stage cylinder guide hole (62), which is located on the side of the second stage cylinder guide hole (42) close to the intake hole (5); the first and second stage cylinders are fixedly installed in the first and second stage cylinder guide holes (61) and (62) respectively along their length.

6. A low-noise compressor according to claim 5, characterized in that: The compressor also includes a cooling section (005) for reducing the temperature of compressed gas. The cooling section (005) is provided with a primary inlet end, a primary outlet end, a secondary inlet end, and a compressed gas outlet. The primary cylinder is connected to the exhaust port on the corresponding side through a primary inlet pipe, and the primary cylinder is connected to the primary inlet end of the cooling section (005) through a primary outlet pipe. The secondary cylinder is connected to the primary outlet end of the cooling section (005) through a secondary inlet pipe, and the secondary cylinder is connected to the secondary inlet end of the cooling section (005) through a secondary outlet pipe.

7. A low-noise compressor according to claim 6, characterized in that: The air supply pipe extends from the outside of the housing (2) through the air inlet (5) into the housing (2); the first-stage air inlet pipe and the second-stage air inlet pipe extend from the outside of the housing (2) through the first exhaust hole (31) and the second exhaust hole (41) on the corresponding side to the housing (2), respectively, and the outer diameter of each pipe is the same as the diameter of the corresponding air inlet or exhaust hole.

8. A low-noise compressor according to any one of claims 5-7, characterized in that: The plane that is parallel to the top surface, perpendicular to the third side surface, and passes through the center of the first-stage cylinder guide hole (32) is called the first plane. The plane that is parallel to the top surface, perpendicular to the third side surface, and passes through the center of the first-stage cylinder guide hole (61) is called the second plane. The plane that is parallel to the top surface, perpendicular to the fourth side surface, and passes through the center of the second-stage cylinder guide hole (42) is called the third plane. The plane that is parallel to the top surface, perpendicular to the fourth side surface, and passes through the center of the second-stage cylinder guide hole (62) is called the fourth plane. The first plane and the second plane do not coincide, and the third plane and the fourth plane do not coincide.

9. A low-noise compressor according to claim 6, characterized in that: The cooling unit (005) includes a first heat exchanger (005a) and a second heat exchanger (005b); one end of the first heat exchanger (005a) is a primary air inlet, and the other end of the first heat exchanger (005a) is a primary air outlet; one end of the second heat exchanger (005b) is a secondary air inlet, and the other end of the second heat exchanger (005b) is a compressed gas outlet; the second heat exchanger (005b) is fixedly installed on the upper surface of the first heat exchanger (005a), with the primary air outlet located directly below the compressed gas outlet and the primary air outlet located directly below the secondary air inlet.

10. A low-noise compressor according to claim 9, characterized in that: The cooling unit (005) also includes a fan (005c), with the other end of the crankshaft passing through the bearing seat hole (1) on the second side and fixedly connected to the fan blade shaft of the fan (005c); the crankcase (002) is located on the intake side of the fan (005c), and the first heat exchanger (005a) and the second heat exchanger (005b) are located on the exhaust side of the fan (005c).

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