Dry screw compressor

Abstract

According to the technical scheme, the dry screw compressor is characterized in that the dry screw compressor comprises a shell, an upper shaft located above the shell and a pump body for extracting oil in the shell, and the upper shaft drives the pump body; the fan is installed outside the shell, and the upper shaft drives the fan; the radiator is installed outside the shell, and oil pumped by the pump body flows to the radiator through a pipeline and flows back into the shell; the fan blows heat dissipation gas towards the radiator, the shell is provided with the surrounding plate wrapping the side face of the radiator, the surrounding plate and the shell form the air guide channel allowing the heat dissipation gas to flow, the cooling effect on cooled oil liquid is improved, and therefore the temperature of the screw and the temperature of the whole machine are reduced.

Description

Technical Field

[0001] The present invention relates to a screw compressor, and more particularly to a dry screw compressor. Background Art

[0002] A dry screw compressor is a positive displacement twin-screw oil-injected compressor in which the medium in the compression chamber does not come into contact with the lubricating oil.

[0003] Dry screw compressors are relatively common. For example, a Chinese patent document with publication number CN114542464B records a dry screw compressor with an upper connection port. Existing screw compressors are cooled by increasing the contact surface between the oil and the drive shaft, but the screw compressor has a poor cooling effect on the cooling oil, resulting in an increase in the overall temperature of the oil. Summary of the invention

[0004] The object of the present invention is to provide a dry screw compressor, which can improve the cooling effect of the cooling oil, thereby reducing the temperature of the screw and the whole machine.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: A dry screw compressor comprises a shell and an upper shaft located on the upper part of the shell, including: a pump body for extracting oil in the shell, the upper shaft drives the pump body; a fan installed outside the shell, the upper shaft drives the fan; a radiator installed outside the shell, the oil extracted by the pump body flows to the radiator through a pipeline and flows back into the shell; the fan blows heat dissipating gas toward the radiator, the shell is provided with a baffle wrapping the side of the radiator, the baffle and the shell form an air guide channel for the heat dissipating gas to flow; the radiator comprises a heat dissipating group, the heat dissipating group is provided with a plurality of heat dissipating pipes for the flow of oil, the heat dissipating pipes are arranged, and heat dissipating air holes for the flow of heat dissipating gas are provided between the heat dissipating pipes; a corrugated plate for heat dissipation is provided in the heat dissipating pipe, and the pipe walls on both sides of the heat dissipating pipe are fitted and fixed on both sides of the corrugated pipe to divide the interior into a plurality of flow channels.

[0006] Preferably, the fan sleeve is provided with a volute, the air outlet of the volute is downward, and the radiator is located below the air outlet.

[0007] Preferably, there are two heat dissipation groups arranged vertically, and the two heat dissipation groups are sequentially connected in series in the return pipeline.

[0008] Preferably, the heat dissipation holes are arranged with upper and lower openings, and the outer wall of the heat dissipation pipe is provided with fins.

[0009] Preferably, the corrugated plate is arranged in a concave-convex bending shape.

[0010] Preferably, an oil extraction pipe connected to the pump body is provided in the shell, and a connecting hole is provided at the bottom of the shell; two sealing rings are installed on the inner wall of the connecting hole; a sealing cap is connected to the connecting hole from the outside to the inside thread, and a groove is provided on the outer wall of the sealing cap, and the sealing ring is sealed on the outer walls on the upper and lower sides of the groove to realize the groove and the connecting hole to form an oil delivery cavity; the oil extraction pipe is connected to the hole wall of the connecting hole to realize the connection between the oil extraction pipe and the oil delivery cavity; the sealing cap is fixed with a sieve cap protruding toward the inside of the shell, and the sieve cap and the sealing cap form a sieve cavity; the side wall of the sealing cap is provided with a through hole to realize the connection between the sieve cavity and the oil delivery cavity.

[0011] Preferably, the pump body is provided with a No. 1 outlet and a No. 2 outlet; the No. 1 outlet is connected to the radiator through a pipeline; the pump body is sleeved with an upper shaft, and a No. 1 sealing ring is provided between the pump body and the upper shaft for sealing and rotating; the shell includes a back shell plate, the back shell plate is sleeved on the upper shaft, and the back shell plate is located on the outside of the pump body, and a No. 2 sealing ring is provided between the back shell plate and the upper shaft for sealing and rotating; an oil passage chamber is formed between the No. 1 sealing ring and the No. 2 sealing ring, the upper shaft is a hollow shaft, the upper shaft is provided with an inlet hole connected to the oil passage chamber, the upper shaft is provided with an outlet hole, the inlet hole and the outlet hole are located at both ends of the upper shaft and are both connected to the hollow part of the upper shaft; the No. 2 outlet is connected to the oil passage chamber.

[0012] Preferably, the pump body is a cycloid pump.

[0013] Preferably, a plug is connected from the outside to the inside thread at the bottom of the shell, and the plug is provided with a magnetic part extending into the shell.

[0014] Preferably, the plug is provided with a conical groove, and the magnetic member is located at the center of the conical groove.

[0015] In summary, the present invention has at least one of the following beneficial effects: (1) The radiator flow channel is separated by a wave plate, and the flow channel is refined to increase the contact surface between the heat sink and the oil. In combination with the directional heat dissipation airflow toward the radiator, the cooling efficiency of the cooling oil is improved, thereby reducing the temperature of the oil; the wave plate can be a metal heat sink.

[0016] (2) As the flow in the radiator becomes smaller and is prone to clogging, the screen cap filters the oil in the pump body to prevent impurities from entering the radiator, thereby improving the stability of the radiator's heat dissipation performance for the oil.

[0017] (3) The magnetic component attracts metal powder and debris, reducing the possibility of metal powder passing through the filter and entering the small flow channels of the radiator to cause blockage. Therefore, the magnetic component improves the stability of the radiator's oil heat dissipation performance.

[0018] (4) Oil is passed through the hollow upper shaft to cool the shaft itself, and the oil is transmitted to the other end to cool the parts inside the shell.

[0019] (5) Because the screw compressor will aerate the flour being transported, lowering the compressor temperature will help lower the temperature of the discharged gas and reduce the occurrence of flour deterioration caused by excessively high compressed gas temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the external structure of the dry screw compressor in the embodiment; Figure 2 is an exploded schematic diagram of a housing, a volute, and a shroud in an embodiment; Figure 3 is a cross-sectional view of a heat dissipation group in an embodiment; Figure 4 is a schematic diagram of the connection relationship between the back shell plate and the upper shaft in the embodiment; Figure 5 yes Figure 4 AA section view in; Figure 6 yes Figure 5 A magnified view of part B; Figure 7 Schematic diagram of the connection relationship between the upper shaft and the pump body in the embodiment; Figure 8 is a partial cross-sectional view of a compressor in an embodiment; Fig. 9 yes Figure 8 The enlarged view of the C part in FIG. Fig.10 is a cross-sectional schematic diagram showing the connection relationship between the oil pumping pipe, the oil outlet pipe and the pump body in the embodiment; Fig.11 is a schematic diagram of the position of the magnetic parts inside the shell in the embodiment; Fig.12 2 is a schematic diagram of the structure of the plug in the embodiment; Fig.13 Schematic diagram of the connection relationship between the plug and the magnetic rod in the embodiment.

[0021] In the figure: 1. Shell; 11. Back shell plate; 2. Upper shaft; 21. Inlet hole; 22. Outlet hole; 3. Pump body; 4. Hoarding; 41. Air guide channel; 51. Fan; 52. Volute; 6. radiator; 61. heat dissipation group; 62. heat dissipation pipeline; 63. corrugated plate; 64. flow channel; 65. heat dissipation pores; 66. fins; 71. Pumping pipe; 72. Oil outlet pipe; 81. sieve cap; 82. plugging cap; 83. groove; 84. sealing ring; 85. sieve cavity; 86. oil delivery cavity; 91, Exit 1; 92, Exit 2; 901, No. 1 sealing ring; 902, No. 2 sealing ring; 903, oil chamber; 101. Plug; 102. Magnetic member; 103. Conical groove; 104. Magnetic rod. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1-13 The present invention is described in further detail.

[0023] Example 1, a dry screw compressor, referring to Figure 1-Figure 4 , including a shell 1, an upper shaft 2 is installed on the upper part of the shell 1, and the upper shaft 2 is linked to the power take-off of the vehicle body; the upper shaft 2 provides a power source for the rotation of the compressor screw, and also provides a power source for the rotation of the fan 51 and the pump body 3.

[0024] Both ends of the upper shaft 2 pass through the housing 1 and are connected by bearings; One end of the upper shaft 2 located on one side of the back shell plate 11 is fixed to the center of the fan 51 , so the rotation of the upper shaft 2 drives the fan 51 to rotate.

[0025] The fan 51 is provided with a volute 52 on its exterior, and the volute 52 is mounted on the housing 1; Figure 2 In the figure, the air outlet of the volute 52 is downward, and the radiator 6 is located below the air outlet. The radiator 6 is used to cool the oil flow, and the fan 51 blows air unidirectionally toward the radiator 6 to enhance the cooling effect on the cooling oil.

[0026] The radiator 6 is installed on the back shell plate 11, and there is a gap between the back shell plate 11; the shell 1 is installed with a surrounding plate 4 that wraps the side of the radiator 6 by screws; the surrounding plate 4 is concave, and the surrounding plate 4 and the back shell plate 11 form an air guide channel 41 surrounding the radiator 6, so when the fan 51 above blows towards the radiator 6, the airflow can increase the contact time and contact area with the radiator 6, thereby enhancing the cooling effect on the radiator 6.

[0027] In order to further improve the heat dissipation effect on the oil, the radiator 6 is designed as follows.

[0028] The radiator 6 includes a plurality of radiator groups 61, which are arranged up and down, and the radiator groups 61 are connected in series from top to bottom, which is conducive to the oil passing through all the radiator groups 61. In this embodiment, two radiator groups 61 arranged up and down are used; Reference Figure 3 As for the heat dissipation group 61 structure, the heat dissipation group 61 is composed of a plurality of heat dissipation pipes 62 arranged in parallel. The heat dissipation pipes 62 are plate-shaped in shape. There are heat dissipation holes 65 between the heat dissipation pipes 62. The heat dissipation holes 65 are arranged vertically, so the gas blown downward by the fan 51 can continue to flow downward through the heat dissipation holes 65.

[0029] The outer wall of the heat dissipation pipe 62 is provided with fins 66 .

[0030] For the heat dissipation group 61, joints are provided at both ends thereof for connecting the ends of all heat dissipation pipes 62; Reference Figure 2 A stacking block is provided between the upper and lower heat dissipation groups 61, and the stacking block on one side serves as a connecting joint for connecting the oil between the upper and lower heat dissipation groups 61. Figure 2 The arrow in the diagram indicates the direction of oil flow.

[0031] Reference Figure 3 A corrugated plate 63 for heat dissipation is provided in the heat dissipation pipe 62. The pipe walls on both sides of the heat dissipation pipe 62 are attached and fixed on both sides of the corrugated pipe to divide the interior into multiple flow channels 64. For one heat dissipation pipe 62, multiple flow channels 64 are arranged up and down.

[0032] The wave plate 63 is bent in a concave-convex shape, and the two tube walls of the heat dissipation pipe 62 and the bending part of the wave plate 63 are fitted and fixed by welding; in other embodiments, the bending part of the wave plate 63 is rounded.

[0033] A pump body 3 is installed inside the back shell plate 11 to extract the oil in the inner shell 1. The pump body 3 is a cycloid pump. The upper shaft 2 penetrates the pump body 3 and drives the pump body 3 to rotate. Specifically, the pump body 3 pumps oil through the oil pumping pipe 71 , and then is connected to the radiator 6 in sequence through pipelines, and the oil after heat dissipation in the radiator 6 flows back to the inside of the housing 1 .

[0034] The pipeline includes an oil extraction pipe 71 and an oil outlet pipe 72 ; the oil extraction pipe 71 is an oil passage drilled inside the shell 1 ; the oil outlet pipe 72 includes an external copper pipe and an oil passage drilled inside the shell 1 .

[0035] Embodiment 2, a dry screw compressor, which is different from Embodiment 1 in that, referring to Figure 4-Figure 6 The housing 1 is provided with an oil extraction pipe 71 connected to the pump body 3, and the bottom of the housing 1 is provided with a connecting hole, and the oil extraction pipe 71 is connected to the connecting hole; Two sealing rings 84 are embedded and installed on the inner wall of the connecting hole; The connection hole is connected with a plugging cap 82 from the outside to the inside thread, and the plugging cap 82 is cylindrical in shape as a whole, and the plugging cap 82 is blocked at the bottom downward; The outer wall of the plugging cap 82 is provided with a circular groove 83, and the sealing ring 84 is fitted and sealed on the upper and lower sides of the groove 83 to achieve sealing of the upper and lower positions of the groove 83, so that the groove 83 and the hole wall of the connecting hole form an oil delivery cavity 86 for the solution oil; The oil extraction pipe 71 is connected to the connecting hole, so the oil extraction pipe 71 is connected to the oil delivery cavity 86; The blocking cap 82 is fixed with a screen cap 81 protruding toward the inside of the housing 1, and the screen cap 81 is a stainless steel mesh cap; The sieve cap 81 and the plugging cap 82 form a sieve cavity 85 , and a through hole is formed on the side wall of the plugging cap 82 to enable the sieve cavity 85 to communicate with the oil delivery cavity.

[0036] Therefore, the oil can enter the oil extraction pipe 71 after being filtered by the sieve cap 81 .

[0037] For the pipe connection of pump body 3, refer to the attached Figure 7-Figure 10 .

[0038] The pump body 3 is sleeved on the upper shaft 2, and the two are connected by a key, and the housing 1 of the pump body 3 is fixed inside the housing 1 by screws; The pump body 3 is provided with a first outlet 91 and a second outlet 92. The first outlet 91 is connected to the oil outlet pipe 72 of the radiator 6, and the pump body 3 outputs oil through the oil outlet pipe 72. A No. 1 sealing ring 901 is provided between the pump body 3 and the upper shaft 2 for sealing and rotating; The housing 1 includes a back shell plate 11, which is sleeved on the upper shaft 2 and located outside the pump body 3. A second sealing ring 902 for sealing and rotating is provided between the back shell plate 11 and the upper shaft 2. An oil passage cavity 903 is formed between the No. 1 sealing ring 901 and the No. 2 sealing ring 902 , and the oil passage cavity 903 is an annular cavity surrounding the upper shaft.

[0039] The second outlet 92 of the pump body 3 points to and is connected to the oil chamber 903 , so the pump body 3 delivers oil to the oil chamber 903 .

[0040] The upper shaft 2 is a hollow shaft, and is provided with an inlet hole 21 connected to the oil chamber 903, and an outlet hole 22, which are located at both ends of the upper shaft 2 and are both connected to the hollow part of the upper shaft 2; Therefore, the pump body 3 inputs the oil into the interior of the upper shaft 2 through the second outlet 92, and then transports the oil to the other end of the upper shaft 2 for discharge.

[0041] Reference Figure 11-Figure 12 The bottom of the housing 1 is connected with a plug 101 through an external to internal thread. The plug 101 is provided with a magnetic member 102 extending into the housing 1, and the magnetic member 102 is a column. The plug 101 is provided with a conical groove 103, and the magnetic column is located at the center of the conical groove 103. Therefore, the metal powder in the oil will be accumulated in the conical groove 103 after being magnetically attracted by the magnetic column, thereby reducing the metal powder and metal debris being washed away by the flowing oil. The magnetic column is located directly below the gear, and the oil that contacts the gear contacts as much of the magnetic column as possible.

[0042] Embodiment 3, a dry screw compressor, which is different from Embodiment 2 in that, with reference to Figure 11-13, the upper end of the magnetic member 102 is hinged with a magnetic rod 104, and the magnetic rod 104 rotates up and down around the hinge point; When inserted into the housing 1 , the magnetic rod 104 is vertically upward, and the magnetic rod 104 is inserted into the housing 1 . Then, under the action of gravity, the magnetic rod 104 rotates downward and contacts the bottom of the housing 1 .

[0043] The design of the magnetic rod 104 greatly increases the contact area between the magnetic absorption surface and the oil, and improves the efficiency and ability of removing metal powder in the oil; and the oil accumulates at the bottom of the housing 1, and the magnetic rod 104 is attached to the oil. When the compressor vibrates up and down, due to the viscosity of the oil, the magnetic rod 104 can be stably placed at the bottom of the housing 1. The number of magnetic rods 104 on the magnetic member 102 can be 2 or 4, etc.

[0044] Furthermore, inside the housing 1 , there is a gap between the vertical state of the magnetic rod 104 and the gear inside the housing 1 , so whether the magnetic rod 104 swings or not will not affect the normal operation of the gear inside the housing 1 .

[0045] When the plug 101 is removed, the magnetic rod 104 is abutted by the edge of the hole in the housing 1, so that the magnetic rod 104 is folded upward, which facilitates the removal of the magnetic rod 104 from the inside of the housing 1 and the cleaning and replacement of the magnet.

[0046] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A dry screw compressor, comprising a housing (1) and an upper shaft (2) located on the upper part of the housing (1), characterized in that: include: A pump body (3) for extracting oil from the housing (1), wherein the upper shaft (2) drives the pump body (3); A fan (51) is mounted outside the housing (1), and the upper shaft (2) drives the fan (51); A radiator (6) is installed outside the housing (1), and the oil extracted by the pump body (3) flows to the radiator (6) through a pipeline and flows back into the housing (1); The fan (51) blows cooling gas toward the radiator (6); the housing (1) is provided with a panel (4) wrapping around the side of the radiator (6); the panel (4) and the housing (1) form an air guide channel (41) for the cooling gas to flow; The radiator (6) comprises a heat dissipation group (61), the heat dissipation group (61) is provided with a plurality of heat dissipation pipes (62) for oil flow, the heat dissipation pipes (62) are arranged in an array, and heat dissipation holes (65) for heat dissipation gas flow are provided between the heat dissipation pipes (62); A corrugated plate (63) for heat dissipation is provided in the heat dissipation pipe (62), and the pipe walls on both sides of the heat dissipation pipe (62) are fitted and fixed on both sides of the corrugated pipe to divide the interior into a plurality of flow channels (64).

2. The dry screw compressor according to claim 1, characterized in that: The fan (51) is sleeved with a volute (52), the air outlet of the volute (52) is downward, and the radiator (6) is located below the air outlet.

3. The dry screw compressor according to claim 2, characterized in that: There are two heat dissipation groups (61) arranged vertically, and the two heat dissipation groups (61) are sequentially connected in series to the return pipeline.

4. The dry screw compressor according to claim 3, characterized in that: The heat dissipation holes (65) are arranged with upper and lower openings, and the outer wall of the heat dissipation pipe (62) is provided with fins (66).

5. The dry screw compressor according to claim 1, characterized in that: The wave plate (63) is arranged in a concave-convex bending manner.

6. The dry screw compressor according to claim 1, characterized in that: An oil extraction pipe connected to the pump body (3) is provided in the housing (1), and a connecting hole is provided at the bottom of the housing (1); Two sealing rings (84) are installed on the inner wall of the connecting hole; The connection hole is connected with a plugging cap (82) through an external to internal thread, the outer wall of the plugging cap (82) is provided with a groove (83), and a sealing ring (84) is fitted and sealed on the outer walls of the groove (83) at both upper and lower sides to realize that the groove (83) and the connection hole form an oil delivery cavity (86); The oil extraction pipe (71) is connected to the hole wall of the connecting hole to achieve communication between the oil extraction pipe (71) and the oil delivery cavity (86); The blocking cap (82) is fixed with a sieve cap (81) protruding toward the interior of the housing (1), and the sieve cap (81) and the blocking cap (82) form a sieve cavity (85); A through hole is provided on the side wall of the blocking cap (82) to enable the sieve cavity (85) to communicate with the oil delivery cavity.

7. The dry screw compressor according to claim 1, characterized in that: The pump body (3) is provided with a first outlet (91) and a second outlet (92); The first outlet (91) is connected to a pipeline of the radiator (6); The pump body (3) is sleeved with the upper shaft (2), and a No. 1 sealing ring (901) is provided between the pump body (3) and the upper shaft (2) for sealing and rotating; The housing (1) comprises a back shell plate (11), the back shell plate (11) is sleeved on the upper shaft (2), and the back shell plate (11) is located outside the pump body (3), and a second sealing ring (902) for sealing and rotating is provided between the back shell plate (11) and the upper shaft (2); An oil passage chamber (903) is formed between the first sealing ring (901) and the second sealing ring (902); the upper shaft (2) is a hollow shaft; the upper shaft (2) is provided with an inlet hole (21) connected to the oil passage chamber (903); the upper shaft (2) is provided with an outlet hole (22); the inlet hole (21) and the outlet hole (22) are located at two ends of the upper shaft (2) and are both connected to the hollow portion of the upper shaft (2); The second outlet (92) is communicated with the oil passage chamber (903).

8. The dry screw compressor according to claim 1, characterized in that: The pump body (3) is a cycloid pump.

9. The dry screw compressor according to claim 1, characterized in that: A plug (101) is connected to the bottom of the shell (1) via an external to internal thread, and the plug (101) is provided with a magnetic part (102) extending into the shell (1).

10. The dry screw compressor according to claim 9, characterized in that: The plug (101) is provided with a tapered groove (103), and the magnetic member (102) is located at the center of the tapered groove (103).

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