A multi-stage compressor

Abstract

The present application relates to a multi-stage compressor, including a shell with at least three compression chambers, a rotor group rotatably installed in the compression chamber, and a driving mechanism used as a power source for the rotor group, wherein the outlet end of the rotor group is provided with a support bearing, and the inlet end of the rotor group for three or more stages of compression is also provided with a support bearing, and a pressure transmission device and a pressure balancing device are also provided, wherein the pressure balancing device is connected to the shell at the outlet end of the compression chamber, and the pressure balancing device balances the pressure transmitted by the pressure transmission device with the air pressure at the outlet end of the compression chamber. The pressure at the outlet end of the rotor group is transmitted to the pressure balancing device through the pressure transmission device, and then the transmitted pressure is balanced through the pressure balancing device, so that the unidirectional pressure borne by the inner ring of the support bearing at the outlet end of the rotor group is balanced, and the outer ring of the support bearing is not easy to be worn due to the rotation of the inner ring of the support bearing.

Description

Technical Field

[0001] The present application relates to the field of compressors, and in particular to a multi-stage compressor. Background Art

[0002] A screw compressor is a type of positive displacement compressor that compresses air by changing the volume between the teeth of the meshing yin and yang rotors in the compressor. It has high compression efficiency and low noise. Therefore, screw compressors are usually chosen as compression tools when gas needs to be compressed.

[0003] When the gas needs to be under high pressure, a multi-stage compression method is usually used to compress the gas. That is, multiple compression chambers are designed on the compressor, and the gas is compressed in multiple stages through multiple pairs of yin and yang rotors to compress the gas to a high-pressure gas state.

[0004] In multi-stage compression, the air first enters the first-stage compression chamber and undergoes the first-stage compression through the yin-yang rotors. The compressed gas is cooled by the cooling device and then enters the second-stage compression chamber for the second-stage compression. The gas after the second-stage compression is cooled by the cooling device and then enters the third-stage compression chamber for the third-stage compression. This process is repeated by analogy. After the gas is compressed in multiple stages in the above manner to reach the required air pressure, the output value load is reached.

[0005] A support bearing is provided at the outlet end of the yin-yang rotor to withstand the pressure difference between the outlet end and the inlet end of the yin-yang rotor. The support bearing usually adopts a four-point contact ball bearing so that it can withstand a larger axial load when a higher speed is required.

[0006] However, when performing gas compression at the third level or above, due to the excessively large pressure difference between the air inlet and air outlet ends of the yin-yang rotors, the inner ring of the support bearing of the yin-yang rotors, after being subjected to a large pressure, will cause the roller of the support bearing to provide excessive pressure to the outer ring of the support bearing due to the characteristics of the four-point contact ball bearing, resulting in a large friction between the roller of the support bearing and the outer ring of the support bearing. When the yin-yang rotors rotate, the inner ring of the support bearing will drive the outer ring of the support bearing to rotate synchronously, which will cause the outer ring of the support bearing to experience greater wear during operation, and the bearing seat used to install the support bearing and the locking surface of the outer ring of the support bearing will also experience greater wear. If the support bearing and the bearing seat are to be replaced, the yin-yang rotor must be disassembled as a whole before replacement can be performed. Frequent disassembly and replacement is not only troublesome, but also easily causes damage to the yin-yang rotors, resulting in a reduction in the service life of the yin-yang rotors. Summary of the invention

[0007] In order to solve the problem that the outer rings of the support bearings of the yin and yang rotors in the compression chambers of the third stage and above of the screw compressor are easily worn and need to be replaced frequently, the present application provides a multi-stage compressor.

[0008] The present application provides a multi-stage compressor adopting the following technical solution:

[0009] A multi-stage compressor, characterized in that it includes a shell with at least three compression chambers, a rotor group rotatably installed in the compression chamber for compressing gas, and a driving mechanism used as a power source for the rotor group, the outlet end of the rotor group is provided with a support bearing for bearing the pressure difference between the two ends of the rotor group, the inlet end of the rotor group for compressing the gas at three levels or more is also provided with a support bearing, and the inlet end of the rotor group is also provided with a pressure transmission device and a pressure balancing device, the pressure transmission device is used to transmit the pressure at the outlet end of the rotor group to the pressure balancing device, the pressure balancing device is connected to the shell at the outlet end of the compression chamber, and the pressure balancing device balances the pressure transmitted by the pressure transmission device with the gas pressure at the outlet end of the compression chamber.

[0010] Through the above technical scheme, the pressure at the outlet end of the rotor group of the three-stage compression is transmitted to the pressure balancing device through the pressure transmission device, and then the transmitted pressure is balanced by the pressure balancing device, so that the unidirectional pressure borne by the inner ring of the support bearing at the outlet end of the rotor group is balanced, so that the inner ring of the support bearing will not apply excessive pressure to the roller and the outer ring, causing the outer ring of the support bearing to wear as the inner ring of the support bearing rotates. At the same time, since the pressure source of the pressure balancing device is the air pressure of the gas output from the outlet end of the rotor group, the reaction force applied by the pressure balancing device to the pressure transmission device for balancing the pressure always forms a dynamic balance with the pressure applied by the rotor group to the pressure transmission device, so that the pressure balancing device is not easy to apply excessive reaction force to the rotor group, resulting in reverse pressure on the support bearing, so that the outer ring of the support bearing rotates with the rotation of the inner ring of the support bearing due to excessive reverse friction.

[0011] Optionally, the pressure transmission device includes:

[0012] A pressing block is pressed against the outer ring of the support bearing, and is provided with an accommodating cavity for accommodating the end of the rotor group. A pressing surface pressed against the support bearing is provided with an avoidance hole, which is communicated with the accommodating cavity, and is used for allowing the end of the rotor group to penetrate into the accommodating cavity.

[0013] A support plate, pressed against the pressing block;

[0014] A support column has one end connected to the support plate and the other end pressed against the pressure balancing device and is located at the center between the support bearings.

[0015] Optionally, a connection hole is formed through the shell at the end of the compression chamber, and the support column is slidably installed in the connection hole.

[0016] Optionally, the pressure balancing device includes:

[0017] A push plate is slidably mounted on the connection hole, one side of which is pressed against the end face of the support column, and the other side of the plate is provided with an air pressure groove;

[0018] A sealing plate is arranged on the shell to seal the connecting hole, and an air inlet hole connected to the air pressure groove is opened on the sealing plate.

[0019] Optionally, a sealing ring is provided between the sealing plate and the shell, and the sealing ring abuts against the outer side of the push plate to form a seal.

[0020] Optionally, a drainage hole is formed through the sealing plate, and the drainage hole is connected to the air pressure groove.

[0021] Optionally, an exhaust hole is formed through the end surface of the support column, the exhaust hole penetrates the support plate, the exhaust hole is connected to the accommodating cavity, and a plurality of weight-reducing holes are formed on the side wall of the pressing block, and the weight-reducing holes are connected to the accommodating cavity.

[0022] Optionally, the push plate is provided with an exhaust groove, and the exhaust groove is connected to the exhaust hole.

[0023] Optionally, the end area of ​​the exhaust hole connected to the exhaust groove is smaller than the area of ​​the exhaust groove.

[0024] Optionally, the driving mechanism includes:

[0025] A driving gear is rotatably mounted in the housing;

[0026] A transmission gear set, provided with a plurality of gears corresponding to the rotor set, for transmission connection between the driving gear and the male rotor;

[0027] The gas outlet end of the rotor group for compressing the gas at the third level or above is drivingly connected to the transmission gear.

[0028] In summary, the present application balances the pressure transmitted by the outlet ends of the positive rotor and the negative rotor by arranging support bearings, pressure blocks, support covers, push plates and sealing plates on the shells of the air inlet ends of the negative rotor and the positive rotor that perform three or more levels of air compression, so that the mounting bearings of the positive rotor and the negative rotor are not easily excessively worn and shortened in service life due to the excessive pressure transmitted by the outlet ends of the positive rotor and the negative rotor during operation, and the air inlet hole of the sealing plate and the air outlet end of the compression chamber are connected by a pressure supply pipe, and the pressure on the air inlet ends of the positive rotor and the negative rotor is balanced by the output pressure of the air outlet ends of the positive rotor and the negative rotor, so that the pressure at both ends of the positive rotor and the negative rotor can be maintained in a balanced state, and the axial force borne by the mounting bearings of the positive rotor and the negative rotor is theoretically zero, thereby improving the service life of the mounting bearings of the positive rotor and the negative rotor, and at the same time, the water accumulated in the air pressure tank is discharged through the drain pipe, effectively preventing the push plate and the sealing plate from being corroded and rusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of one side of the compression chamber of the present application, and the connecting pipes between the compression chambers are not shown in the figure.

[0030] Figure 2 It is a three-dimensional structural schematic diagram of one side of the driving mechanism of the present application.

[0031] Figure 3 It is a cross-sectional view of the driving mechanism of the present application.

[0032] Figure 4 It is a cross-sectional view of the compression chamber for primary compression of air in the present application.

[0033] Figure 5 It is a cross-sectional view of the compression chamber of the present application for compressing air at the third level or above.

[0034] Figure 6 yes Figure 5 Enlarged schematic diagram of part A in the middle.

[0035] Figure 7 It is a schematic diagram of the explosion at the third-stage compression chamber of the present application.

[0036] Figure 8 It is a three-dimensional structural schematic diagram of the internal structure of the three-stage compression chamber of the present application, and the sealing plate and the support plate are not shown in the figure.

[0037] Fig. 9 It is a schematic diagram of the three-dimensional structure of the maintenance component of the present application.

[0038] Fig.10 is a cross-sectional view of the maintenance component of the present application.

[0039] Fig.11 yes Fig.10Enlarged schematic diagram of part B in the middle.

[0040] Those skilled in the art will appreciate that the elements in the drawings are shown for simplicity and clarity and are not necessarily drawn to scale. For example, the size and position of some elements in the drawings may be exaggerated relative to other elements to help improve understanding of the embodiments of the present invention.

[0041] Figure numerals: 1, shell; 11, compression chamber; 12, support bearing; 121, bearing seat; 13, connecting hole; 14, mounting groove; 15, three-stage compression chamber; 2, rotor group; 21, female rotor; 22, male rotor; 3, pressure transmission device; 31, pressure block; 311, avoidance hole; 312, accommodating chamber; 313, weight reduction hole; 32, support plate; 4, support column; 41, exhaust hole; 5, pressure balancing device; 51, push plate; 511, air pressure groove; 512, exhaust groove; 52, sealing plate; 521, air inlet hole; 522, drainage hole; 6, driving mechanism; 6 1. Driving gear; 611. Connecting shaft; 62. Transmission gear set; 7. Sealing ring; 71. Sealing ring; 8. Maintaining assembly; 81. Mounting tube; 811. First joint; 812. Second joint; 813. Connecting valve; 814. Mounting hole; 815. Slide; 816. Activated carbon; 82. First adjusting block; 821. Fixed groove; 83. Second adjusting block; 84. Fixed block; 841. Fixed hole; 85. Adjusting bolt; 86. Adjusting spring; 87. Indicator rod; 871. Mark; 88. Insert plate; 881. Push rod; 89. Fixed spring; 9. Plug. DETAILED DESCRIPTION

[0042] The following is combined with Figure 1 — Fig.11 This application is described in further detail.

[0043] The present application embodiment discloses a multi-stage compressor, referring to Figure 1 , Figure 2 and Figure 4 , including a shell 1 with three or more compression chambers 11 inside. The number of the compression chambers 11 is determined according to the number of compression stages required. In this embodiment, three-stage compression is adopted. According to the number of compression stages, three compression chambers 11 are arranged in the shell 1. A group of rotor groups 2 are arranged in each of the three compression chambers 11. The rotor group 2 includes a pair of male rotors 22 and female rotors 21. The male rotors 22 and the female rotors 21 are meshed with each other for compressing the gas.

[0044] Reference Figure 2 , Figure 3 and Figure 4The housing 1 is provided with a driving mechanism 6, which includes a driving gear 61 rotatably mounted in the housing 1 and three transmission gear sets 62. In this embodiment, the transmission gear set 62 uses a single gear with different numbers of teeth. The driving gear 61 is coaxially fixedly mounted with a connecting shaft 611, and is connected to the motor through the connecting shaft 611. The three transmission gear sets 62 are all rotatably mounted in the housing 1. The three male rotors 22 are respectively connected to the driving gear 61 through the three transmission gear sets 62. When working, the motor drives the driving gear 61 to rotate through the connecting shaft 611, and the driving gear 61 synchronously drives the three male rotors 22 to rotate through the three transmission gear sets 62. The rotation of the male rotor 22 drives the female rotor 21 to rotate to compress the gas.

[0045] Reference Figure 1 and Figure 2 The compression chamber 11 is provided on one side of the housing 1, and the driving mechanism 6 is provided on the other side of the housing 1. The side of the housing 1 provided with the compression chamber 11 is set as the front view, the leftmost side in the front view direction is the first-stage compression chamber 11, the rightmost side is the second-stage compression chamber 11, and the middle side is the third-stage compression chamber 15. The compression chambers 11 are all provided with an air inlet channel and an air outlet channel, and the cross-sectional area of ​​the air inlet channel is larger than the cross-sectional area of ​​the air outlet channel. The third-stage compression chamber 15 is named as the third-stage compression chamber 15.

[0046] Air enters the first-stage compression chamber 11 from the air inlet passage of the first-stage compression chamber 11 , is compressed by the rotor assembly 2 , and is output from the air outlet passage of the first-stage compression chamber 11 .

[0047] The output compressed air is transported to the cooler along the pipeline for cooling, and then input into the second-stage compression chamber 11 from the air inlet channel of the second-stage compression chamber 11 along the pipeline. After being compressed by the rotor group 2 in the second-stage compression chamber 11, it is output from the air outlet channel of the second-stage compression chamber 11.

[0048] The output compressed air is transported to the cooler along the pipeline for cooling, and then input into the three-stage compression chamber 15 from the air inlet channel of the three-stage compression chamber 15 along the pipeline. After being compressed by the rotor group 2 in the three-stage compression chamber 15, it is output from the air outlet channel of the three-stage compression chamber 15. The output compressed air is supplied to the load through the pipeline.

[0049] Reference Figure 4 and Figure 5 A support bearing 12 for bearing axial pressure is coaxially fixedly installed at the outlet ends of the male rotor 22 and the female rotor 21, and the support bearing 12 adopts a four-point contact ball bearing.

[0050] Reference Figure 4 and Figure 5The air inlet end of the male rotor 22 in the first-stage compression chamber 11 and the second-stage compression chamber 11 is connected to the driving gear 61 through the transmission gear set 62, and the air outlet end of the male rotor 22 in the third-stage compression chamber 15 is connected to the driving gear 61 through the transmission gear set 62.

[0051] Since the air pressure after the third stage compression is relatively high, the pressure difference between the air inlet and air outlet of the male rotor 22 and the female rotor 21 in the third stage compression chamber 15 is relatively high.

[0052] After the inner ring of the support bearing 12 at the air outlet end is subjected to a large pressure, due to the characteristics of the four-point contact ball bearing, the roller of the support bearing 12 will provide excessive pressure to the outer ring of the support bearing 12, resulting in a large friction between the roller of the support bearing 12 and the outer ring of the support bearing 12. When the female rotor 21 and the male rotor 22 rotate, the inner ring of the support bearing 12 will drive the outer ring of the support bearing 12 to rotate synchronously, which will cause the outer ring of the support bearing 12 to produce greater wear during operation.

[0053] Therefore, a support bearing 12 is also coaxially fixedly installed at the air inlet end of the rotor group 2 of the third stage compression. At the same time, a pressure balancing device 5 and a pressure transmission device 3 are provided at the air inlet end of the rotor group 2 of the third stage compression. The support bearing 12 transmits the pressure difference between the air outlet end and the air inlet end of the rotor group 2 to the pressure transmission device 3, and the pressure transmission device 3 transmits the pressure to the pressure balancing device 5. The pressure is balanced by the pressure balancing device 5, so that the pressure on the inner ring of the support bearing 12 at the air outlet end of the rotor group 2 is balanced, and the pressure applied by the inner ring to the roller and the outer ring is reduced, so that the outer ring will not rotate with the rotation of the inner ring.

[0054] Reference Figure 6 , Figure 7 and Figure 8 The pressure transfer device 3 includes a pressure block 31 , a support plate 32 , and a support column 4 integrally arranged on the support plate 32 .

[0055] The pressing block 31 is slidably mounted on the bearing seat 121 of the supporting bearing 12 via a positioning pin, and a blocking bolt is threadedly mounted on the pressing block 31 to prevent the positioning pin from sliding out.

[0056] The pressing block 31 is provided with two avoidance holes 311 which are coaxial with the male rotor 22 and the female rotor 21 respectively. At the same time, a receiving cavity 312 for receiving the ends of the male rotor 22 and the female rotor 21 is provided inside the pressing block 31. One end of the receiving cavity 312 is open and passes through the pressing block 31. A plurality of weight-reducing holes 313 are provided on the side wall of the receiving cavity 312. The weight-reducing holes 313 pass through the pressing block 31. By providing the weight-reducing holes 313, the weight of the pressing block 31 is reduced and the internal situation of the receiving cavity 312 is easier to observe.

[0057] The air inlet ends of the male rotor 22 and the female rotor 21 are coaxially passed through two avoidance holes 311 and are located in the accommodating cavity 312 , and the side of the pressing block 31 away from its open end is tightly fitted against the outer ring of the support bearing 12 at the air inlet ends of the male rotor 22 and the female rotor 21 .

[0058] Reference Figure 6 , Figure 7 and Figure 8 The side of the support plate 32 facing away from the support column 4 is in close contact with the end surface of the open end of the pressure block 31. A connecting hole 13 is provided through the shell 1 at one end of the three-stage compression chamber 15. The support column 4 is slidably installed in the connecting hole 13. The support plate 32 is radially limited by the connecting hole 13. At this time, the support column 4 is located at the center of the two support bearings 12, so that the support force of the support plate 32 and the pressure block 31 on the two support bearings 12 is relatively even.

[0059] Reference Figure 6 , Figure 7 and Figure 8 The pressure balancing device 5 includes a circular push plate 51, a circular sealing plate 52 and a sealing ring 7.

[0060] Reference Figure 6 , Figure 7 and Figure 8 The push plate 51 is slidably installed in the connection hole 13, one end face of the support column 4 is in close contact with the plate surface of the push plate 51, and a circular installation groove 14 is coaxially provided on the outer wall of the housing 1 and the connection hole 13, and the connection hole 13 is connected with the installation groove 14. The sealing ring 7 is fitted and embedded in the installation groove 14, and the sealing plate 52 is fixedly installed on the housing 1 by bolts and closes the installation groove 14 and the connection hole 13. The sealing ring 7 forms a seal between the sealing ring 71 and the sealing plate 52, between the sealing ring 71 and the push plate 51, and between the sealing ring 71 and the bottom of the installation groove 14.

[0061] Reference Figure 6 , Figure 7 and Figure 8 A circular air pressure groove 511 is coaxially formed on a side of the push plate 51 facing away from the support column 4 , and a circular exhaust groove 512 is formed on a side of the push plate 51 pressed against the support column 4 .

[0062] Reference Figure 6 , Figure 7 and Figure 8 The sealing plate 52 is provided with an air inlet hole 521 and a drain hole 522, the air inlet hole 521 is located directly above the drain hole 522, and both the air inlet hole 521 and the drain hole 522 are connected to the air pressure groove 511. Under normal conditions, both the air inlet hole 521 and the drain hole 522 are closed with a plug 9 to prevent external dust from entering.

[0063] Reference Figure 6 , Figure 7 and Figure 8 The air inlet 521 is connected to the air outlet end of the three-stage compression chamber 15 through a pipeline, so that the air pressure at the air outlet end of the three-stage compression chamber 15 is transmitted to the air pressure groove 511 to support the push plate 51, and the pressure generated by the air pressure is transmitted to the outer ring of the support bearing 12 at the air inlet end of the rotor group 2 along the push plate 51, the support column 4, the support plate 32, and the pressure block 31 in turn. Since the support bearing 12 adopts a four-point contact ball bearing, the pressure of the outer ring of the bearing will be transmitted to the inner ring of the bearing along the roller, and then transmitted to the rotor group 2. The pressure continues to be transmitted along the rotor group 2 to the inner ring of the support bearing 12 at the air outlet end of the rotor group 2, and the pressure on the inner ring of the support bearing 12 at the air outlet end of the rotor group 2 is balanced, reducing the pressure of the inner ring of the support bearing 12 on the roller and the outer ring, thereby reducing the friction between the inner ring and the roller and the outer ring, so that the outer ring of the inner ring of the support bearing 12 at the air outlet end of the rotor group 2 is not easy to rotate when the inner ring rotates, and thus the outer ring is not easy to wear.

[0064] Reference Figure 6 , Figure 7 and Figure 8 The length of the support column 4 plus the thickness of the push plate 51 is greater than the length of the connection hole 13, so that the support column 4 and the support plate 32 will not press against the inner wall of the housing 1 when supporting the pressing block 31, causing support failure. At the same time, a gap is provided between the push plate 51 and the sealing plate 52, so that the push plate 51 will not press against the sealing plate 52, causing support failure.

[0065] Reference Figure 6 , Figure 7 and Figure 8 The drainage hole 522 of the sealing plate 52 is sealedly connected to the shell 1 at the air inlet end of the three-stage compression chamber 15 through a pipeline. The compressed gas enters the air pressure groove 511 through the air inlet hole 521 to provide pressure to the push plate 51, and then is discharged along the drainage hole 522 to the air inlet end of the three-stage compression chamber 15 for reuse. While flowing, the air flow brings out the moisture in the air pressure groove 511, so that it is not easy for moisture to accumulate in the air pressure groove 511 and cause corrosion of the push plate 51 and the sealing plate 52.

[0066] Reference Fig. 9 , Fig.10 and Fig.11 A maintenance assembly 8 is provided on the pipe of the drain hole 522, and the maintenance assembly 8 includes a mounting pipe 81, a first adjustment block 82 sealingly and slidingly mounted in the mounting pipe 81, a second adjustment block 83 threadedly mounted at one end of the mounting pipe 81, and a fixing block 84. One end of the mounting pipe 81 is closed, and the other end of the mounting pipe 81 is closed by the second adjustment block 83.

[0067] Reference Fig. 9 , Fig.10 and Fig.11 The side wall of the mounting tube 81 is fixedly mounted with a first joint 811 and a second joint 812. The mounting tube 81 is connected to the drainage pipe of the drainage hole 522 through the first joint 811 and the second joint 812. The gas discharged from the drainage hole 522 enters the mounting tube 81 through the first joint 811 and is discharged from the mounting tube 81 through the second joint 812.

[0068] Reference Fig. 9 , Fig.10 and Fig.11 A connecting valve 813 is fixedly installed on the side wall of the installation tube 81. The connecting valve 813 is sealed and connected to the pressure supply pipe through a pipeline. The first regulating block 82 is located between the connecting valve 813 and the second joint 812, which divides the internal space of the installation tube 81 into two parts. The first joint 811 and the second joint 812 are located on the same side. After the installation tube 81 is connected to the housing 1, the present application is started. When the air pressure on both sides of the first regulating block 82 is equal, the second joint 812 is opened to discharge air. At this time, the connecting valve 813 is closed to keep the air pressure in the installation tube 81 on the side of the connecting valve 813 stable.

[0069] Reference Fig. 9 , Fig.10 and Fig.11 When the air pressure on one side of the first joint 811 and the second joint 812 is less than the specified value due to excessive air outlet from the air outlet valve, the compressed gas on the side of the connecting valve 813 will push the first adjusting plate to block and close the second joint 812 to increase the air pressure at the air pressure groove 511 until it reaches the specified value.

[0070] Reference Fig. 9 , Fig.10 and Fig.11 A mounting hole 814 is provided on the inner wall of the mounting tube 81, and a fixing block 84 is slidably installed in the mounting hole 814. One end of the fixing block 84 is hemispherical, and a fixing groove 821 is provided on the side wall of the first adjusting block 82 to be embedded with the fixing block 84. An adjusting bolt 85 is sealed and threadedly installed on the side wall of the mounting tube 81, and one end of the adjusting bolt 85 is coaxially inserted into the mounting hole 814. An adjusting spring 86 is provided between the adjusting bolt 85 and the fixing block 84, and the two ends of the adjusting spring 86 are respectively pressed against the end surface of the adjusting bolt 85 and the end surface of the fixing block 84.

[0071] Reference Fig. 9 , Fig.10 and Fig.11When the first adjusting block 82 closes the second joint 812, the adjusting spring 86 pushes the fixing block 84 to fit into the fixing groove 821. When the air pressure on the first joint 811 side reaches the specified value again, at this time, due to the expansion of the space of the mounting pipe 81 on the side of the connecting valve 813 and the decrease of the air pressure therein, the air pressure on the first joint 811 side can push the first adjusting block 82 to push the fixing block 84 back into the mounting hole 814, and then continue to push the first adjusting block 82 to slide to open the second joint 812. At this time, the air pressure on both sides of the first adjusting block 82 is equal, and the first adjusting block 82 stops sliding.

[0072] Reference Fig. 9 , Fig.10 and Fig.11 When the air pressure in the mounting tube 81 on one side of the first joint 811 drops to a specified value, the first adjusting block 82 closes the second joint 812 by different specified values. The elastic force of the adjusting bolt 85 can be increased or decreased by rotating the adjusting bolt 85 to adapt.

[0073] Reference Fig. 9 , Fig.10 and Fig.11 Since the air pressure of the compressed gas entering the installation pipe 81 on the side of the first joint 811 will be lost to a certain extent, after the connection valve 813 is closed, the inner cavity volume of the installation pipe 81 on the side of the connection valve 813 is adjusted by rotating the second adjustment block 83, thereby adjusting the air pressure in the installation pipe 81 on the side of the connection valve 813. An indicator rod 87 is fixedly provided on the side wall of the first adjustment block 82, one end of which is sealed and passes through the closed end of the installation pipe 81, and a mark 871 is provided on the indicator rod 87. When the mark 871 is aligned with the end surface of the installation pipe 81, the air pressure on both sides of the first adjustment block 82 is equal.

[0074] Reference Fig. 9 , Fig.10 and Fig.11 A sliding groove 815 is provided on the side wall of the mounting tube 81, and a plug plate 88 is slidably installed in the sliding groove 815. A fixing spring 89 is provided between one end of the sliding groove 815 and the plug plate 88. The two ends of the fixing spring 89 are respectively pressed against the end surface of the sliding groove 815 and the end surface of the plug plate 88. A fixing hole 841 that slidably cooperates with the plug plate 88 is provided on the side wall of the fixing block 84. When the fixing block 84 completely enters the mounting hole 814, the fixing spring 89 pushes one end of the plug plate 88 to be inserted into the fixing hole 841 to complete the fixing of the fixing block 84, so that the first adjusting block 82 will not be affected by the fixing block 84 when moving.

[0075] Reference Fig. 9 , Fig.10 and Fig.11A push rod 881 is integrally provided on the side wall of the plug plate 88, and one end of the push rod 881 extends out of the slide groove 815. When the first adjusting block 82 closes the second joint 812, the first adjusting block 82 pulls the plug plate 88 out of the fixing hole 841 through the push rod 881, and the fixing block 84 is embedded in the fixing groove 821.

[0076] Reference Fig. 9 , Fig.10 and Fig.11 , activated carbon 816 is placed in one side of the installation pipe 81 having a first joint 811 for absorbing moisture in the passing gas.

[0077] Reference Fig. 9 , Fig.10 and Fig.11 A vent hole 41 is coaxially formed on the cylindrical end of the support cover, the vent hole 41 is communicated with the cover-shaped end of the support cover, and the vent groove 512 is communicated with the vent hole 41. Since the sealing degree among the push plate 51, the sealing ring 7 and the support cover is relatively high, when the push plate 51 is installed, some air is easily compressed and remains between the push plate 51, the sealing ring 7 and the support cover, causing the push plate 51 to fail to fit with the end surface of the support cover, thereby affecting the support effect of the support cover.

[0078] Reference Fig. 9 , Fig.10 and Fig.11 , and by designing the exhaust hole 41, the air between the push plate 51, the sealing ring 7 and the support cover is discharged, so that the push plate 51 can fit tightly against the end surface of the support cover, so that the support of the support cover by the push plate 51 is more stable and the support position accuracy is higher. At the same time, by providing the exhaust groove 512, when the push plate 51 is installed, the air can more easily flow out from between the push plate 51, the sealing ring 7 and the support cover, which can reduce the amount of air residue between the push plate 51, the sealing ring 7 and the support cover as much as possible, greatly improving the support effect of the push plate 51 on the support cover, and then can effectively reduce the wear of the mounting bearing of the rotor group 2 during operation.

[0079] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A multi-stage compressor, characterized in that: The invention comprises a housing (1) provided with at least three compression chambers (11), a rotor group (2) rotatably mounted in the compression chamber (11) for compressing gas, and a driving mechanism (6) used as a power source for the rotor group (2); a support bearing (12) is provided at the outlet end of the rotor group (2) for bearing the pressure difference between the two ends of the rotor group (2); a support bearing (12) is also provided at the inlet end of the rotor group (2) for compressing gas at three levels or more; and a pressure transmission device (3) and a pressure balancing device (5) are also provided at the inlet end of the rotor group (2); the pressure balancing device (5) is connected to the housing (1) at the outlet end of the compression chamber (11) where it is located; and the pressure balancing device (5) balances the pressure transmitted by the pressure transmission device (3) with the gas pressure at the outlet end of the compression chamber (11); The pressure transmission device (3) comprises: A pressing block (31) is pressed against the outer ring of the support bearing (12), and is provided with an accommodation cavity (312) for accommodating the end of the rotor group (2). A avoidance hole (311) is provided on the pressing surface pressed against the support bearing (12), and the avoidance hole (311) is communicated with the accommodation cavity (312). The avoidance hole (311) is used to allow the end of the rotor group (2) to penetrate into the accommodation cavity (312); A support plate (32) pressed against the pressing block (31); A support column (4), one end of which is connected to the support plate (32), and the other end of which is pressed against the pressure balancing device (5) and is located at the center between the support bearings (12); A connection hole (13) is formed through the shell (1) at the end of the compression chamber (11), and the support column (4) is slidably mounted in the connection hole (13); The pressure balancing device (5) comprises: A push plate (51) is slidably mounted on the connection hole (13), one side of which is pressed against the end surface of the support column (4), and the other side of the plate is provided with an air pressure groove (511); A sealing plate (52) is provided on the housing (1) to seal the connection hole (13), and is provided with an air inlet hole (521) connected to the air pressure groove (511); An exhaust hole (41) is formed through the end surface of the support column (4), the exhaust hole (41) penetrates the support plate (32), the exhaust hole (41) is connected to the accommodating cavity (312), a plurality of weight-reducing holes (313) are formed on the side wall of the pressing block (31), the weight-reducing holes (313) are communicated with the accommodating cavity (312); an exhaust groove (512) is formed on the push plate (51), and the exhaust groove (512) is connected to the exhaust hole (41).

2. A multi-stage compressor according to claim 1, characterized in that: A sealing ring (7) is provided between the sealing plate (52) and the housing (1), and the sealing ring (7) abuts against the outer side of the push plate (51) to form a seal.

3. A multi-stage compressor according to claim 1, characterized in that: The sealing plate (52) is provided with a drainage hole (522) extending therethrough, and the drainage hole (522) is connected to the air pressure groove (511).

4. A multi-stage compressor according to claim 1, characterized in that: The area of ​​one end of the exhaust hole (41) connected to the exhaust groove (512) is smaller than the area of ​​the exhaust groove (512).

5. A multi-stage compressor according to claim 1, characterized in that: The driving mechanism (6) comprises: A driving gear (61) rotatably mounted in the housing (1); A transmission gear set (62), provided with a plurality of gears corresponding one to one with the rotor set (2), and used for transmission connection between the driving gear (61) and the male rotor (22); The gas outlet end of the rotor group (2) for performing three-stage or higher-stage compression of gas is in driving connection with the transmission gear group (62).

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