Dry type oil-free screw air compressor

Abstract

The utility model relates to the technical field of air compressors, and discloses a dry-type oil-free screw air compressor, which is characterized in that positioning bearings are respectively sleeved on the outer walls of two ends of a positioning rotating shaft and a synchronous gear shaft, and a sealing rubber ring is inserted on the inner wall between a rear-end shell and the adjacent positioning bearing; a shaft seal is inserted in the inner wall of the end, close to the positioning rotating shaft, of the end cover, a sealing rubber ring and a spring shaft sleeve are sleeved on the outer wall of the end, close to the end cover, of the synchronous gear shaft, and the sealing rubber ring is located between the positioning bearing and the spring shaft sleeve. Through the arrangement of the positioning bearing, the sealing rubber ring and the spring shaft sleeve, the positioning bearing provides radial and axial support for the rotor shaft, mechanical friction during rotation is reduced, the sealing rubber ring reduces the pressure difference between the two sides of the bearing, the sealing rubber ring reduces the pressure difference between the two sides of the bearing, the shaft seal limits axial displacement, and the abrasion risk is reduced; the elastic pre-tightening force of the spring shaft sleeve can dynamically adjust the compression amount of the sealing rubber ring, and it is ensured that good sealing performance is kept in long-term operation.

Description

TECHNICAL FIELD

[0001] The utility model relates to air compressor technical field, concretely is a dry type oil -free screw air compressor. BACKGROUND

[0002] With the progress of society, in the field of higher quality gas requirement, such as textile, metallurgy, food, chemical industry, medicine, petroleum and air separation, the existing dry type oil -free screw air compressor can provide high quality compressed gas.

[0003] The utility model discloses a kind of dry type oil -free screw air compressor for compressed air.The energy consumption is high, the volume is big, the production cost is high and the problem of easy failure existing in the existing dry type oil -free screw air compressor, the utility model provides a kind of dry type oil -free screw air compressor, the dry type oil -free screw air compressor includes primary compressor and secondary compressor, and the compression host in the primary compressor and the secondary compressor and driving motor are all with direct drive connection.The compression host in the primary compressor and the secondary compressor and driving motor in the dry type oil -free screw air compressor of the utility model are all with direct drive connection, compared with the existing dry type oil -free screw air compressor, the connecting coupling is cancelled, volume effectively reduces, production cost reduces;There is no transmission energy consumption loss, and energy consumption can be effectively reduced;At the same time, there is no coupling and gear failure, and failure can be reduced.

[0004] The air compressor in the operation process, rotor shaft and shell due to temperature change produce thermal expansion and cold shrinkage difference, rigid seal and the contact pressure of shaft are not adjustable, possibly because too tight increases rotation resistance, reduces energy efficiency, or because too loose leads to leakage, and the structure has no elastic buffer, vibration is directly transmitted to sealing connection part, can accelerate sealing wear and tear, shorten sealing life. Utility model content

[0005] The purpose of the present application is to provide a dry type oil -free screw air compressor that solves the problem of high wear and tear of the sealing assembly during operation.

[0006] To solve the above technical problems, the utility model is realized by the following technical schemes:

[0007] The utility model discloses a kind of dry oil-free screw air compressors, including main casing and rotor shaft, the rotor shaft is installed on the inner wall of main casing, the main casing includes end cap and rear end shell, the inside upper and lower sides of end cap and rear end shell are respectively equipped with positioning shaft and synchronous gear shaft, positioning shaft and the outer wall of both ends of synchronous gear shaft are respectively equipped with positioning bearing, sealing rubber ring is inserted on the inner wall between rear end shell and adjacent positioning bearing, the inner wall of one end of end cap close to positioning shaft is inserted with shaft seal, the outer wall of one end of synchronous gear shaft close to end cap is equipped with sealing rubber ring and spring shaft sleeve, and sealing rubber ring is located between positioning bearing and spring shaft sleeve.The purpose of thus setting is, in the use process of the air compressor, external air enters by the air inlet flange of end cap top front end, flows into the air inlet cavity formed by middle shell, end cap and rear end shell, air in air inlet cavity enters Yin and Yang rotor screw group, positioning shaft drives male rotor, synchronous gear shaft drives female rotor, and the two meshing rotates, air is compressed, compressed air passes through the internal flow channel of middle shell and rear end shell bottom, and finally is discharged from the exhaust port of rear end shell bottom tail end, and main casing is connected by end cap, middle shell, rear end shell, bolt assembly and sealing sheet, when maintaining, just need to disassemble bolt, can separate each shell module, quickly contact internal Yin and Yang rotor screw group, positioning bearing and other core components, without overall disassembly equipment, greatly shorten maintenance time, when bearing, sealing element and other components are worn, corresponding bearing seat or sealing assembly can be directly disassembled, and are individually overhauled or replaced, avoid affecting other parts of main casing, bearing seat of end cap and rear end shell port, sealing assembly outside end cap are fixed by bolt, air inlet cavity is communicated with internal flow channel, optimizes air flow path, reduces airflow resistance, shaft seal blocks high-pressure gas axial leakage, sealing rubber ring isolates external pollutants and buffers vibration, together maintain the clean, stable operating environment of bearing, sealing rubber ring reduces pressure difference on both sides of bearing, shaft seal limits axial displacement, reduces wear risk, the elastic pretightening force of spring shaft sleeve can dynamically adjust the compression amount of sealing rubber ring, ensure that good sealing is maintained in long-term operation.

[0008] Further, positioning shaft and the middle part outer wall of synchronous gear shaft are equipped with Yin and Yang rotor screw group, and the two screws of Yin and Yang rotor screw group are meshed and connected.Thus, in the use process of the air compressor, air in air inlet cavity enters Yin and Yang rotor screw group, positioning shaft drives male rotor, synchronous gear shaft drives female rotor, and the two meshing rotates, air is compressed.

[0009] Further, the end cover and the rear end shell are respectively inserted with bearing seats, the end cover is covered with a sealing assembly on the outer wall of the side close to the outer end of the spring shaft sleeve, and the bearing seat and the sealing assembly are respectively fixed and installed on the two ends of the end cover and the rear end shell through bolt assemblies.

[0010] Further, an intermediate shell is arranged between the end cover and the rear end shell, sealing sheets are arranged on the outer walls of the two ends of the intermediate shell, and the end cover and the rear end shell extend to the inner walls of the two sides of the intermediate shell through the bolt assemblies installed on the inner walls and penetrating the sealing sheets. The purpose of such arrangement is that, during use of the air compressor, the main shell is connected by the end cover, the intermediate shell and the rear end shell through bolt assemblies and sealing sheets, and during maintenance, the shell modules can be separated by only disassembling the bolts, so that the core components such as the internal male and female rotor screw groups and the locating bearings can be quickly contacted, and the equipment does not need to be disassembled as a whole, so that the maintenance time is greatly shortened.

[0011] Further, the intermediate shell, the end cover and the rear end shell are connected to form an air inlet cavity, internal flow channels are arranged on the inner walls of the bottoms of the intermediate shell and the rear end shell, and the air inlet cavity and the internal flow channels are in communication. The purpose of such arrangement is that, during use of the air compressor, external air enters through the air inlet flange at the top front end of the end cover, flows into the air inlet cavity formed by the intermediate shell, the end cover and the rear end shell, and enters the male and female rotor screw groups to be meshed and rotated to compress air, and the air inlet cavity is in communication with the internal flow channels to optimize the air flow path and reduce air flow resistance.

[0012] Further, the end cover is provided with an air inlet flange at the top front end, the rear end shell is provided with an air outlet interface at the bottom tail end close to the internal flow channel, the air inlet flange is in communication with the inside of the male and female rotor screw groups, and the air outlet interface is in communication with the inside of the internal flow channel. The purpose of such arrangement is that, during use of the air compressor, the compressed air passes through the internal flow channels at the bottoms of the intermediate shell and the rear end shell and is finally discharged from the air outlet interface at the bottom tail end of the rear end shell.

[0013] The air compressor has the following beneficial effects:

[0014] (1) The utility model discloses a positioning bearing, the setting of sealing rubber ring and spring shaft sleeve, and positioning bearing provides radial and axial support for rotor shaft, reduces the mechanical friction when rotating, and sealing rubber ring reduces the pressure difference of bearing both sides, and shaft seal restricts axial displacement, reduces the abrasion risk, and the elastic pretightening force of spring shaft sleeve can dynamically adjust the compression amount of sealing rubber ring, to ensure that good sealing is maintained in long -term operation.

[0015] (2) The utility model discloses the setting of end cover, intermediate casing and rear end casing, and the host computer casing is connected by bolt assembly and sealing sheet through end cover, intermediate casing, rear end casing, when maintaining, only need to disassemble bolt, can separate each casing module, and the quick contact internal male and female rotor screw rod group, positioning bearing and other core components do not need to be disassembled as a whole, and the maintenance time is greatly shortened.

[0016] Of course, any product implementing the utility model does not necessarily need to achieve all the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0018] Figure 1 It is the main body structure schematic diagram of the utility model;

[0019] Figure 2 It is the host computer casing section split structure schematic diagram of the utility model;

[0020] Figure 3 It is the section structure schematic diagram of the utility model;

[0021] Figure 4 It is the section part split structure schematic diagram of the utility model;

[0022] In the drawings, the component list represented by each sign is as follows:

[0023] In the drawing, 1, host computer casing;100, bolt assembly;101, intermediate casing;102, end cover;103, sealing sheet;104, rear end casing;105, air inlet flange;106, exhaust port;107, bearing seat;108, internal flow passage;109, sealing assembly;2, rotor shaft;200, air inlet cavity;201, positioning shaft;202, male and female rotor screw rod group;203, positioning bearing;204, sealing rubber ring;205, shaft seal;206, spring shaft sleeve;207, synchronous gear shaft. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0025] Please refer to Figures 1-4The utility model discloses a kind of dry oil-free screw air compressors, including main casing 1 and rotor shaft 2, rotor shaft 2 is installed on the inner wall of main casing 1, main casing 1 includes end cap 102 and rear end shell 104, end cap 102 and rear end shell 104 are equipped with positioning shaft 201 and synchronous gear shaft 207 respectively on the inside upper and lower sides, positioning shaft 201 and synchronous gear shaft 207 are respectively equipped with positioning bearing 203 on the outer wall of both ends, sealing rubber ring 204 is inserted on the inner wall between rear end shell 104 and adjacent positioning bearing 203, shaft seal 205 is inserted on the inner wall of one end of end cap 102 close to positioning shaft 201, sealing rubber ring 204 and spring shaft sleeve 206 are sleeved on the outer wall of one end of synchronous gear shaft 207 close to end cap 102, sealing rubber ring 204 is located between positioning bearing 203 and spring shaft sleeve 206. The purpose of such arrangement is that, during the use of the air compressor, external air enters through the air inlet flange 105 at the top front end of the end cap 102, flows into the intake cavity 200 formed by the intermediate casing 101, the end cap 102 and the rear end shell 104, and the air in the intake cavity 200 enters the yin-yang rotor screw group 202, the positioning shaft 201 drives the male rotor, the synchronous gear shaft 207 drives the female rotor, both are meshed and rotated, and the air is compressed, the compressed air passes through the internal flow channel 108 at the bottom of the intermediate casing 101 and the rear end shell 104, and is finally discharged from the exhaust port 106 at the tail end of the bottom of the rear end shell 104, the main casing is connected by the end cap 102, the intermediate casing 101, the rear end shell 104, the sealing sheet 103 and the bolt assembly 100, during maintenance, only the bolts need to be disassembled, and the shell modules can be separated, the core components such as the yin-yang rotor screw group 202 and the positioning bearing 203 can be quickly contacted, the equipment does not need to be disassembled as a whole, the maintenance time is greatly shortened, when the bearings, sealing elements and other components are worn, the corresponding bearing seat or sealing assembly can be directly disassembled for individual repair or replacement, without affecting other parts of the main casing, the bearing seat 107 at the port of the end cap 102 and the rear end shell 104 and the sealing assembly 109 outside the end cap are fixed by bolts, the intake cavity 200 is communicated with the internal flow channel 108, the air flow path is optimized, the air resistance is reduced, the shaft seal 205 blocks the axial leakage of high-pressure gas, the sealing rubber ring 204 isolates external pollutants and buffers vibration, and the clean and stable operating environment of the bearing 203 is maintained, the sealing rubber ring 204 reduces the pressure difference between the two sides of the bearing, the shaft seal 205 limits the axial displacement and reduces the risk of wear, the elastic pre-tightening force of the spring shaft sleeve 206 can dynamically adjust the compression amount of the sealing rubber ring 204, to ensure good sealing property in long-term operation.

[0026] The middle outer wall of the positioning shaft 201 and the synchronous gear shaft 207 is provided with a male and female rotor screw set 202, and the two screws of the male and female rotor screw set 202 are meshed and connected with each other. The purpose of such arrangement is that, during use of the air compressor, air in the air inlet cavity 200 enters the male and female rotor screw set 202, the positioning shaft 201 drives the male rotor, and the synchronous gear shaft 207 drives the female rotor, and the two are meshed and rotated to compress air.

[0027] The ports of the end cover 102 and the rear end shell 104 are respectively provided with bearing seats 107, the outer wall of the side of the end cover 102 close to the outer end of the spring shaft sleeve 206 is covered with a sealing assembly 109, and the bearing seat 107 and the sealing assembly 109 are respectively fixedly installed on the two ends of the end cover 102 and the rear end shell 104 by the bolt assembly 100. The purpose of such arrangement is that, during use of the air compressor, the bearing seat 107 of the port of the end cover 102 and the rear end shell 104 and the sealing assembly 109 on the outer side of the end cover are fixed by bolts, and when the bearing, the sealing member and other components are worn, the corresponding bearing seat or sealing assembly can be directly disassembled for individual repair or replacement, thereby avoiding affecting other parts of the main shell.

[0028] The intermediate shell 101 is arranged between the end cover 102 and the rear end shell 104, the outer wall of the two ends of the intermediate shell 101 is provided with sealing sheets 103, and the end cover 102 and the rear end shell 104 extend to the inner walls of the two sides of the intermediate shell 101 through the sealing sheets 103 by the bolt assembly 100 installed on the inner walls. The purpose of such arrangement is that, during use of the air compressor, the main shell is connected by the end cover 102, the intermediate shell 101 and the rear end shell 104 through the bolt assembly 100 and the sealing sheet 103, and during maintenance, only the bolts need to be disassembled to separate the shell modules, so that the core components such as the male and female rotor screw set 202 and the positioning bearing 203 can be quickly contacted, and the equipment does not need to be disassembled as a whole, thereby greatly shortening the maintenance time.

[0029] The intermediate shell 101, the end cover 102 and the rear end shell 104 are connected to form an air inlet cavity 200, the inner walls of the bottoms of the intermediate shell 101 and the rear end shell 104 are provided with internal flow channels 108, and the cavities of the air inlet cavity 200 and the internal flow channels 108 are in communication. The purpose of such arrangement is that, during use of the air compressor, external air enters through the air inlet flange 105 at the top front end of the end cover 102, flows into the air inlet cavity 200 formed by the intermediate shell 101, the end cover 102 and the rear end shell 104, the air in the air inlet cavity 200 enters the male and female rotor screw set 202 to mesh and rotate to compress air, and the air inlet cavity 200 is in communication with the internal flow channels 108 to optimize the air flow path and reduce air flow resistance.

[0030] The top front end of the end cover 102 is provided with an air inlet flange 105, and the bottom tail end of the rear end shell 104 close to the internal flow channel 108 is provided with an exhaust interface 106. The air inlet flange 105 is in flow communication with the interior of the male and female rotor screw group 202, and the exhaust interface 106 is in flow communication with the interior of the internal flow channel 108. The purpose of such arrangement is that, during use of the air compressor, the compressed air passes through the internal flow channel 108 at the bottom of the intermediate shell 101 and the rear end shell 104, and is finally discharged from the exhaust interface 106 at the bottom tail end of the rear end shell 104.

[0031] In use, during use of the air compressor, external air enters through the air inlet flange 105 at the top front end of the end cover 102, flows into the air inlet cavity 200 formed by the intermediate shell 101, the end cover 102 and the rear end shell 104, and the air in the air inlet cavity 200 enters the male and female rotor screw group 202. The positioning shaft 201 drives the male rotor, and the synchronous gear shaft 207 drives the female rotor. The two are meshed and rotated to compress the air. The compressed air passes through the internal flow channel 108 at the bottom of the intermediate shell 101 and the rear end shell 104, and is finally discharged from the exhaust interface 106 at the bottom tail end of the rear end shell 104.

[0032] The main shell is connected by the end cover 102, the intermediate shell 101, the rear end shell 104 and the sealing sheet 103 through the bolt assembly 100. During maintenance, only the bolts need to be disassembled to separate the shell modules, quickly access the core components such as the internal male and female rotor screw group 202 and the positioning bearing 203, without the need to disassemble the entire device, greatly shortening the maintenance time. The bearing seats 107 at the ports of the end cover 102 and the rear end shell 104 and the sealing assembly 109 on the outer side of the end cover are fixed by bolts. When the bearings, sealing elements and other components are worn, the corresponding bearing seat or sealing assembly can be directly disassembled for individual repair or replacement, avoiding affecting other parts of the main shell.

[0033] The air inlet cavity 200 is in communication with the internal flow channel 108, optimizing the air flow path and reducing air flow resistance. The shaft seal 205 blocks the axial leakage of high-pressure gas, and the sealing rubber ring 204 isolates external contaminants and buffers vibration, together maintaining a clean and stable operating environment for the bearing 203. The sealing rubber ring 204 reduces the pressure difference between the two sides of the bearing, the shaft seal 205 limits the axial displacement and reduces the risk of wear, and the elastic pre-tightening force of the spring shaft sleeve 206 can dynamically adjust the compression amount of the sealing rubber ring 204, ensuring good sealing performance in long-term operation.

[0034] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A dry-type oil-free screw air compressor, comprising a main housing (1) and a rotor shaft (2), characterized in that: The rotor shaft (2) is mounted on the inner wall of the main housing (1). The main housing (1) includes an end cover (102) and a rear housing (104). The upper and lower sides of the interior of the end cover (102) and the rear housing (104) are respectively provided with a positioning shaft (201) and a synchronous gear shaft (207). Positioning bearings (203) are respectively fitted on the outer walls of both ends of the positioning shaft (201) and the synchronous gear shaft (207). The rear housing (104) A sealing rubber ring (204) is inserted on the inner wall between the end cap (102) and the adjacent positioning bearing (203). A shaft seal (205) is inserted on the inner wall of the end cap (102) near the positioning shaft (201). A sealing rubber ring (204) and a spring bushing (206) are fitted on the outer wall of the end cap (207) near the end cap (102). The sealing rubber ring (204) is located between the positioning bearing (203) and the spring bushing (206).

2. The dry oil-free screw air compressor according to claim 1, characterized in that: The positioning shaft (201) and the synchronous gear shaft (207) are equipped with male and female rotor screw assemblies (202), and the two screws of the male and female rotor screw assemblies (202) are meshed with each other.

3. A dry oil-free screw air compressor according to claim 1, characterized in that: Bearing seats (107) are respectively inserted into the ports of the end cap (102) and the rear housing (104). A sealing assembly (109) is covered on the outer wall of the end cap (102) near the outer end of the spring bushing (206). The bearing seats (107) and the sealing assembly (109) are fixedly installed at both ends of the end cap (102) and the rear housing (104) by bolt assemblies (100).

4. A dry oil-free screw air compressor according to claim 3, characterized in that: An intermediate housing (101) is provided between the end cap (102) and the rear housing (104). Sealing plates (103) are arranged on the outer walls of both ends of the intermediate housing (101). The end cap (102) and the rear housing (104) extend to the inner walls of the intermediate housing (101) through the sealing plates (103) via bolt assemblies (100) installed on their inner walls.

5. A dry oil-free screw air compressor according to claim 4, characterized in that: The intermediate housing (101), end cap (102) and rear housing (104) are connected to form an air intake chamber (200). The bottom inner walls of the intermediate housing (101) and the rear housing (104) are provided with internal flow channels (108), and the air intake chamber (200) and the internal flow channels (108) are in communication.

6. A dry oil-free screw air compressor according to claim 5, characterized in that: The end cap (102) has an air inlet flange (105) at the top front end, and the rear end housing (104) has an exhaust port (106) at the bottom end near the internal flow channel (108). The air inlet flange (105) communicates with the interior of the male and female rotor screw assembly (202), and the exhaust port (106) communicates with the interior of the internal flow channel (108).

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