Silent dry-type oil-free screw compressor

Abstract

The utility model belongs to the technical field of air compressors, and provides a silent dry-type oil-free screw compressor which comprises a case, a compression mechanism, an air inlet mechanism and a cooling mechanism, a first cavity, a second cavity and a third cavity are sequentially arranged in the machine box in the length extending direction in a separated mode. The compression mechanism comprises a main machine and a motor, the motor is arranged in the first cavity, the main machine is arranged in the second cavity, and the output end of the motor is in transmission connection with the main machine. The air inlet mechanism comprises an air inlet box and an air filter, the air inlet box is arranged in the first cavity, an air inlet is formed in one side of the air inlet box, a fresh air opening opposite to the air inlet is formed in one side of the first cavity, and a filtering cavity used for containing the air filter is formed in the air inlet box. A labyrinth air duct communicated with the air inlet and the filtering chamber is further arranged in the air inlet box, and the air filter is communicated with an air inlet valve of the main machine through an air guide pipe; the cooling mechanism comprises an air cooler which is arranged in the third cavity and is communicated with the exhaust hole of the main engine; and the exhaust hole is provided with a silencer.

Description

Technical Field

[0001] This utility model relates to the field of air compressor technology, and in particular to a silent dry oil-free screw compressor. Background Technology

[0002] Currently, the market has increasingly higher requirements for compressed air quality, and many air consumption scenarios require oil-free compressed air, significantly increasing the demand for oil-free compressors. The market demand for dry oil-free compressors is also increasing. Dry oil-free screw compressors typically operate at high speeds (10,000–30,000 rpm), generating significant high-frequency mechanical noise, particularly from the high-frequency gas flow. Current environmental regulations are stricter than before, with particular emphasis on noise control.

[0003] Currently, most dry oil-free screw compressors focus on exhaust noise reduction in their air ducts. However, improper configuration of the air intake duct and compressor unit can also lead to increased operating noise. Existing dry oil-free screw compressors have not paid enough attention to this, resulting in excessive noise.

[0004] The technical problem to be solved by this application is: how to provide a quiet dry oil-free screw compressor with simple structure and good noise reduction effect. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a silent dry oil-free screw compressor, which has the characteristics of simple structure and good quietness.

[0006] The technical solution adopted in this utility model is: a silent dry oil-free screw compressor, including a casing, a compression mechanism, an air intake mechanism and a cooling mechanism respectively built into the casing;

[0007] The inner wall of the chassis is lined with sound-absorbing cotton, and the interior of the chassis is divided into a first chamber, a second chamber and a third chamber in sequence along the length direction;

[0008] The compression mechanism includes a main unit and a motor. The motor is located in the first chamber, the main unit is located in the second chamber, and the output end of the motor is connected to the main unit for transmission.

[0009] The air intake mechanism includes an air intake box and an air filter built into the air intake box. The air intake box is built into the first chamber. The inner wall of the air intake box is lined with sound-absorbing cotton. An air inlet is provided on one side of the air intake box. A fresh air inlet is provided on one side of the first chamber, opposite to the air inlet. The air intake box has a filter chamber for accommodating the air filter. The air intake box also has a labyrinth duct connecting the air inlet and the filter chamber. The air filter is connected to the air intake valve of the main unit through a duct.

[0010] The cooling mechanism includes an air cooler built into the third chamber, which is connected to the exhaust port of the main unit. The exhaust port of the main unit is equipped with a silencer.

[0011] The silent dry-type oil-free screw compressor of this application, by placing the main unit in the second chamber in the middle of the casing, keeps the main unit as far away from the side wall of the casing as possible. Moreover, the second chamber is relatively independent from the first and third chambers, and the cavity wall of the second chamber forms a sound insulation wall, effectively blocking the noise emitted by the main unit from being transmitted to the first and third chambers. In conjunction with the sound-absorbing cotton on the inner wall of the casing, the noise emitted by the main unit can be effectively blocked from being transmitted to the outside. By setting a labyrinth air duct inside the air inlet box and placing sound-absorbing cotton on the inner wall of the air inlet box, the intake noise can be effectively reduced. Placing the air inlet box in the first chamber allows the air inlet to be far away from the main unit, which can avoid the intake air temperature being too high and increasing the working pressure of the cooling mechanism, allowing the cooling mechanism to operate smoothly at low power, thereby reducing the noise emitted by the cooling mechanism. The noise from the exhaust port can be absorbed by the silencer device. By combining multiple sound insulation and noise reduction methods, the noise of the compressor can be effectively reduced.

[0012] In some embodiments, a fresh air damper is provided at the fresh air inlet, and a plurality of air guide fins are spaced apart on the fresh air damper. The air guide fins include a first air guide plate and a second air guide plate. One end of the first air guide plate is connected to the fresh air damper, and the other end extends obliquely toward the interior of the first chamber and is connected to the second air guide plate. The other end of the second air guide plate extends obliquely toward the interior of the first chamber. The first air guide plate and the second air guide plate are arranged at an angle.

[0013] By adopting the above technical solution, the air guide fins are spaced apart to form a "V" shaped air duct, which can change the direction of airflow, avoid generating "wind howling" sound, and also reduce noise leakage through the "V" shaped air duct, which is conducive to reducing intake noise.

[0014] In some implementations, a sealing strip is provided at the edge of the fresh air damper.

[0015] By adopting the above technical solution, the sealing strip can enhance the sealing performance of the fresh air door panel and also play a role in shock absorption, reducing the vibration of airflow passing through the fresh air door panel, thereby reducing noise.

[0016] In some embodiments, a heat insulation board is provided between the first chamber and the second chamber, an air duct passes through the heat insulation board, and a ventilation board is provided on the heat insulation board.

[0017] By adopting the above technical solution, by setting heat insulation boards in the first chamber and the second chamber, the heat generated by the main unit can be prevented from entering the first chamber, thus avoiding affecting the temperature of the air inlet. At the same time, the heat insulation board can also act as a soundproof wall, blocking the noise generated by the main unit from being transmitted to the first chamber.

[0018] In some embodiments, the cooling mechanism further includes an oil cooler and a cooling fan built into the third chamber. The oil cooler is connected to the oil outlet and oil inlet of the main unit. The oil cooler and the air cooler are arranged side by side in the vertical direction to separate the second chamber and the third chamber. The cooling fan is located on the side of the oil cooler and the air cooler away from the main unit. Cooling air vents are provided on the cavity wall of the third chamber.

[0019] By adopting the above technical solution, the oil cooler and the air cooler are arranged vertically side by side, forming a soundproof wall. This simplifies the structure of the chassis, reduces costs, and blocks the transmission of noise from the host.

[0020] In some embodiments, the cooling air vent is located at the top of the third chamber, and the airflow direction of the cooling fan is perpendicular to the cooling air vent.

[0021] Using the above technical solution, the cooling fan uses a suction method to deliver air, and the cooling air outlet is perpendicular to the air delivery direction of the cooling fan, forming an "L"-shaped air duct, which can effectively block noise.

[0022] In some implementations, the main unit is a two-stage compressor main unit, with a first silencer installed at the first-stage exhaust port and a second silencer installed at the second-stage exhaust port.

[0023] By adopting the above technical solution, and by setting the first muffler and the second muffler at the primary exhaust port and the secondary exhaust port respectively, exhaust noise can be effectively reduced.

[0024] In some embodiments, the air cooler includes a primary cooler and a secondary cooler. The input end of the primary cooler is connected to a first muffler, the output end of the primary cooler is connected to the secondary air intake of the main unit, the input end of the secondary cooler is connected to a second muffler, and the output end of the secondary cooler is connected to an exhaust pipe.

[0025] By adopting the above technical solution, and by setting the first muffler and the second muffler at the first-stage exhaust port and the second-stage exhaust port respectively, exhaust noise can be effectively reduced.

[0026] In some embodiments, the air intake mechanism further includes a vent pipe and a third silencer, one end of which is connected to the air intake valve and the other end of which is connected to the filter chamber, and the third silencer is connected to the end of the vent pipe near the filter chamber.

[0027] By adopting the above technical solution and installing a third silencer on the vent pipe, the noise generated by the main unit's venting can be effectively reduced.

[0028] In some implementations, an vent box is provided on one side of the air inlet box, the vent box is connected to the filter chamber, and the third silencer is built into the vent box.

[0029] By adopting the above technical solution, the vent box can protect the third muffler, and since the third muffler is built into the vent box, the sound insulation and noise reduction effect can be further improved. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a silent dry oil-free screw compressor according to a preferred embodiment of the present invention;

[0031] Figure 2 for Figure 1 The diagram shows a structural schematic of a silent dry oil-free screw compressor from another perspective; the top cover of the housing is not shown.

[0032] Figure 3 for Figure 1 The diagram shows a structural schematic of a silent dry oil-free screw compressor from another perspective, in which the top cover and side panels of the housing are not shown.

[0033] Figure 4 for Figure 3 The diagram shows a structural schematic of a silent dry oil-free screw compressor from another perspective, in which the top cover and side panels of the housing are not shown.

[0034] Figure 5 for Figure 1 The diagram shows the structure of the fresh air damper in a silent dry oil-free screw compressor.

[0035] Figure 6 for Figure 3 The diagram shows the structure of the compression mechanism and the air intake mechanism in a silent dry oil-free screw compressor.

[0036] In the diagram: 100, Silent dry oil-free screw compressor; 10, Chassis; 11, First chamber; 111, Fresh air inlet; 112, Fresh air damper; 113, Air guide fins; 12, Second chamber; 13, Third chamber; 131, Cooling air outlet; 14, Heat insulation plate; 15, Ventilation plate; 20, Compression mechanism; 21, Main unit; 211, First silencer; 212, Second silencer; 22, Motor; 30, Air intake mechanism; 31, Air intake box; 311, Air inlet; 312, Filter chamber; 313, Labyrinth duct; 32, Air filter; 33, Air duct; 34, Vent pipe; 35, Third silencer; 36, Vent box; 40, Cooling mechanism; 41, Air cooler; 411, Primary cooler; 412, Secondary cooler; 42, Oil cooler; 43, Cooling fan. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. When the number of elements is referred to as "multiple," it can be any number of two or more. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] Please see Figures 1 to 6A preferred embodiment of the present invention provides a silent dry oil-free screw compressor 100, comprising a housing 10, a compression mechanism 20, an air intake mechanism 30, and a cooling mechanism 40 respectively housed within the housing 10; the inner wall of the housing 10 is provided with sound-absorbing cotton, and the interior of the housing 10 is sequentially divided into a first chamber 11, a second chamber 12, and a third chamber 13 along its length; the compression mechanism 20 includes a main unit 21 and a motor 22, with the motor 22 located in the first chamber 11 and the main unit 21 located in the second chamber 12, the output end of the motor 22 being drively connected to the main unit 21; the air intake mechanism 30 includes an air intake box 31 and an air filter 32 housed within the air intake box 31, for intake... The air inlet box 31 is built into the first chamber 11. The inner wall of the air inlet box 31 is provided with sound-absorbing cotton. An air inlet 311 is provided on one side of the air inlet box 311. A fresh air inlet 111 is provided on one side of the first chamber 11, which is opposite to the air inlet 311. The air inlet box 31 is provided with a filter chamber 312 for accommodating the air filter 32. The air inlet box 31 is also provided with a labyrinth air duct 313 connecting the air inlet 311 and the filter chamber 312. The air filter 32 is connected to the air intake valve of the main unit 21 through the air duct 33. The cooling mechanism 40 includes an air cooler 41 built into the third chamber 13. The air cooler 41 is connected to the exhaust port of the main unit 21. The exhaust port of the main unit 21 is provided with a silencer.

[0041] The silent dry oil-free screw compressor 100 of this application, by placing the main unit 21 in the second chamber 12 located in the middle of the casing 10, makes the main unit 21 as far away from the side wall of the casing 10 as possible. Moreover, the second chamber 12 is relatively independent from the first chamber 11 and the third chamber 13. The cavity wall of the second chamber 12 forms a sound insulation wall, effectively blocking the noise emitted by the main unit 21 from being transmitted to the first chamber 11 and the third chamber 13. In conjunction with the sound-absorbing cotton on the inner wall of the casing 10, the noise emitted by the main unit 21 can be effectively blocked from being transmitted to the outside. The air intake box 31 is equipped with a labyrinth air duct 313 and sound-absorbing cotton is installed on the inner wall of the air intake box 31, which can effectively reduce the intake noise. The air intake box 31 is located in the first chamber 11, which can keep the air inlet 311 away from the main unit 21. This can prevent the intake air temperature from being too high and increasing the working pressure of the cooling mechanism 40, so that the cooling mechanism 40 can operate smoothly at low power, thereby reducing the noise emitted by the cooling mechanism 40. The noise from the exhaust port can be absorbed by the silencer. By combining a variety of sound insulation and noise reduction methods, the noise of the compressor can be effectively reduced.

[0042] Furthermore, the top and side panels of the enclosure have been thickened to enhance the structural strength of the enclosure, effectively prevent resonance between the top and side panels, and reduce noise.

[0043] like Figure 1 and Figure 2As shown, a fresh air damper 112 is provided at the fresh air inlet 111, and a plurality of air guide fins 113 are spaced apart on the fresh air damper 112. Preferably, as shown... Figure 5 As shown, the air guide fins 113 include a first air guide plate and a second air guide plate. One end of the first air guide plate is connected to the fresh air damper plate 112, and the other end extends obliquely into the first chamber 11 and is connected to the second air guide plate. The other end of the second air guide plate extends obliquely into the first chamber 11. The first air guide plate and the second air guide plate are set at an angle. The air guide fins 113 are spaced apart to form a "V" shaped air duct, which can change the direction of airflow, avoid generating "wind howling" sound, and also reduce noise leakage through the "V" shaped air duct, which helps to reduce intake noise.

[0044] In one embodiment, a sealing strip is provided on the edge of the fresh air damper panel 112. The sealing strip can enhance the sealing performance of the fresh air damper panel 112, and at the same time, it can play a shock absorption role, reducing the vibration of airflow passing through the fresh air damper panel 112, thereby reducing noise.

[0045] Furthermore, sealing strips are also provided along the edges of other movable door panels. Preferably, the sealing strips are D-shaped sealing strips, and sound-absorbing cotton is also attached to the back side of the door panel.

[0046] In one embodiment, such as Figures 2 to 4 As shown, a heat insulation plate 14 is provided between the first chamber 11 and the second chamber 12, and the air duct 33 passes through the heat insulation plate 14. A ventilation plate 15 is provided on the heat insulation plate 14. By providing the heat insulation plate 14 between the first chamber 11 and the second chamber 12, the heat generated by the main unit 21 can be prevented from entering the first chamber 11, thus avoiding affecting the temperature of the air inlet 311. At the same time, the heat insulation plate 14 can also act as a soundproof wall, blocking the noise generated by the main unit 21 from being transmitted to the first chamber 11.

[0047] like Figure 3 and Figure 4 As shown, the cooling mechanism 40 also includes an oil cooler 42 and a cooling fan 43 built into the third chamber 13. The oil cooler 42 connects to the oil outlet and oil inlet of the main unit 21. The oil cooler 42 and the air cooler 41 are arranged side by side in a vertical direction to separate the second chamber 12 and the third chamber 13. The cooling fan 43 is located on the side of the oil cooler 42 and the air cooler 41 away from the main unit 21. Cooling air vents 131 are provided on the cavity wall of the third chamber 13. By arranging the oil cooler 42 and the air cooler 41 vertically side by side, the oil cooler 42 and the air cooler 41 form a soundproof wall, which simplifies the structure of the chassis 10, reduces costs, and blocks the noise transmission of the main unit 21.

[0048] Furthermore, the cooling vent 131 is located at the top of the third chamber 13, and the airflow direction of the cooling fan 43 is perpendicular to the cooling vent 131. The cooling fan 43 uses a suction method to deliver air, and the cooling vent 131 is perpendicular to the airflow direction of the cooling fan 43, forming an "L"-shaped air duct, which can effectively block noise.

[0049] In this embodiment, the main unit 21 is a two-stage compressor main unit 21. The first-stage exhaust port of the main unit 21 is equipped with a first muffler 211, and the second-stage exhaust port of the main unit 21 is equipped with a second muffler 212. By setting the first muffler 211 and the second muffler 212 at the first-stage exhaust port and the second-stage exhaust port respectively, exhaust noise can be effectively reduced.

[0050] Furthermore, the air cooler 41 includes a primary cooler 411 and a secondary cooler 412. The input end of the primary cooler 411 is connected to the first muffler 211, and the output end of the primary cooler 411 is connected to the secondary air intake of the main unit 21. The input end of the secondary cooler 412 is connected to the second muffler 212, and the output end of the secondary cooler 412 is connected to the exhaust pipe. By setting the first muffler 211 and the second muffler 212 at the primary exhaust port and the secondary exhaust port respectively, exhaust noise can be effectively reduced.

[0051] Preferably, the first muffler 211 is an impedance composite muffler, and the second muffler 212 is a muffler combining resistive and porous diffusion silencing.

[0052] In one embodiment, the air intake mechanism 30 further includes a vent pipe 34 and a third silencer 35. One end of the vent pipe 34 is connected to the air intake valve, and the other end is connected to the filter chamber 312. The third silencer 35 is connected to the end of the vent pipe 34 near the filter chamber 312. By providing a third silencer 35 on the vent pipe 34, the noise generated by the main unit 21 during air exhaust can be effectively reduced.

[0053] Furthermore, an vent box 36 is provided on one side of the air inlet box 31. The vent box 36 is connected to the filter chamber 312, and the third silencer 35 is built into the vent box 36. The vent box 36 can protect the third silencer 35, and since the third silencer 35 is built into the vent box 36, the sound insulation and noise reduction effect can be further improved.

[0054] The silent dry oil-free screw compressor 100 of this application incorporates noise reduction and sound absorption designs in various aspects, including the position of the main unit 21 inside the casing 10, intake noise reduction, exhaust noise reduction, front and rear partitioning of the main unit 21, air intake channel, cooling and heat dissipation channel, door panel sound-absorbing material thickness, plate thickness, and sealing strip, effectively reducing the overall noise of the machine.

[0055] Finally, it should be noted that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A silent dry-type oil-free screw compressor, comprising a casing (10), a compression mechanism (20), an air intake mechanism (30), and a cooling mechanism (40) respectively built into the casing (10), characterized in that: The inner wall of the chassis (10) is provided with sound-absorbing cotton, and the interior of the chassis (10) is sequentially divided into a first chamber (11), a second chamber (12) and a third chamber (13) along the length extension direction; The compression mechanism (20) includes a main unit (21) and a motor (22). The motor (22) is located in the first chamber (11), and the main unit (21) is located in the second chamber (12). The output end of the motor (22) is connected to the main unit (21) in a transmission connection. The air intake mechanism (30) includes an air intake box (31) and an air filter (32) built into the air intake box (31). The air intake box (31) is built into the first chamber (11). The inner wall of the air intake box (31) is provided with sound-absorbing cotton. An air inlet (311) is provided on one side of the air intake box (31). A fresh air inlet (111) is provided on one side of the first chamber (11) opposite to the air inlet (311). The air intake box (31) is provided with a filter chamber (312) for accommodating the air filter (32). The air intake box (31) is also provided with a labyrinth duct (313) connecting the air inlet (311) and the filter chamber (312). The air filter (32) is connected to the air intake valve of the main unit (21) through the air duct (33). The cooling mechanism (40) includes an air cooler (41) built into the third chamber (13), the air cooler (41) being connected to the exhaust port of the main unit (21), and the exhaust port of the main unit (21) being provided with a silencer.

2. The silent dry oil-free screw compressor according to claim 1, characterized in that, A fresh air damper plate (112) is provided at the fresh air inlet (111). A plurality of air guide fins (113) are provided on the fresh air damper plate (112) at intervals. The air guide fins (113) include a first air guide plate and a second air guide plate. One end of the first air guide plate is connected to the fresh air damper plate (112), and the other end extends obliquely into the first chamber (11) and is connected to the second air guide plate. The other end of the second air guide plate extends obliquely into the first chamber (11). The first air guide plate and the second air guide plate are set at an angle.

3. The silent dry oil-free screw compressor according to claim 2, characterized in that, The edge of the fresh air door panel (112) is provided with a sealing strip.

4. The silent dry oil-free screw compressor according to claim 1, characterized in that, A heat insulation plate (14) is provided between the first chamber (11) and the second chamber (12), and the air duct (33) passes through the heat insulation plate (14). A ventilation plate (15) is provided on the heat insulation plate (14).

5. The silent dry oil-free screw compressor according to claim 1, characterized in that, The cooling mechanism (40) also includes an oil cooler (42) and a cooling fan (43) built into the third chamber (13). The oil cooler (42) is connected to the oil outlet and oil inlet of the main unit (21). The oil cooler (42) and the air cooler (41) are arranged side by side in the vertical direction to separate the second chamber (12) and the third chamber (13). The cooling fan (43) is located on the side of the oil cooler (42) and the air cooler (41) away from the main unit (21). The third chamber (13) has a cooling air vent (131) on its cavity wall.

6. The silent dry oil-free screw compressor according to claim 5, characterized in that, The cooling air vent (131) is located at the top of the third chamber (13), and the air supply direction of the cooling fan (43) is perpendicular to the cooling air vent (131).

7. The silent dry oil-free screw compressor according to claim 1, characterized in that, The host (21) is a two-stage compressor host (21). The first stage exhaust port of the host (21) is equipped with a first silencer (211), and the second stage exhaust port of the host (21) is equipped with a second silencer (212).

8. The silent dry oil-free screw compressor according to claim 7, characterized in that, The air cooler (41) includes a primary cooler (411) and a secondary cooler (412). The input end of the primary cooler (411) is connected to the first muffler (211), the output end of the primary cooler (411) is connected to the secondary air inlet of the host (21), the input end of the secondary cooler (412) is connected to the second muffler (212), and the output end of the secondary cooler (412) is connected to the exhaust pipe.

9. The silent dry oil-free screw compressor according to claim 1, characterized in that, The air intake mechanism (30) also includes a vent pipe (34) and a third silencer (35). One end of the vent pipe (34) is connected to the air intake valve, and the other end is connected to the filter chamber (312). The third silencer (35) is connected to the end of the vent pipe (34) near the filter chamber (312).

10. The silent dry oil-free screw compressor according to claim 9, characterized in that, An vent box (36) is provided on one side of the air inlet box (31), the vent box (36) is connected to the filter chamber (312), and the third silencer (35) is built into the vent box (36).

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