Bolted air filter, filter duct structure and air compressor

Abstract

The present application relates to the technical field of air compressor, and provides a bolt type air filter, a filter air duct structure and an air compressor.The bolt type air filter comprises a bolt type shell, a threaded rod with a cavity arranged therein, and a smooth section of the threaded rod is provided with a through hole communicating with the cavity; a filter core is accommodated in the cavity, and the filter core is provided with a filter cavity with one end open and the other end sealed, and the bolt type air filter has an air filtering channel passing through the filter core from the filter cavity to the through hole.The bolt type air filter has the functions of fastening and air filtering, and is arranged in the air duct of the air compressor, specifically in the air duct leading from the crank chamber to the air inlet storage cavity, so as to not only play the role of fixed connection, but also filter the oil-gas mixture discharged from the crank chamber, thereby ensuring the stable performance of the air compressor; and the bolt type air filter has simple structure, small size, and is convenient to process and assemble, and is flexible to use.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air compressors, in particular to a bolt type air filter, an air filtering passage structure and an air compressor. BACKGROUND

[0002] An air communication pipeline is arranged between the crankshaft working chamber and the air inlet chamber of the air compressor to maintain the crankshaft working chamber at atmospheric pressure. The crankshaft working chamber needs to be lubricated with engine oil. Under the action of high temperature, the engine oil forms an oil gas aerosol or an oil gas mixture (hereinafter collectively referred to as an oil gas mixture).

[0003] In the current air compressor, the air inlet of the air communication pipeline is arranged close to the oil tank (the oil tank is communicated with the crankshaft working chamber), which inevitably brings part of the oil gas mixture into the air inlet chamber, and the air inlet chamber supplies the oil gas mixture to the piston working chamber. Over time, the oil leakage of the air compressor increases, affecting the performance of the air compressor.

[0004] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0005] Therefore, the present application provides a bolt type air filter, an air filtering passage structure and an air compressor. The bolt type air filter has a fastening function and an air filtering function. The bolt type air filter is arranged in the air passage of the air compressor, specifically in the air passage leading from the crankshaft chamber to the air inlet chamber. The bolt type air filter not only has a fixed connection function, but also filters the oil gas mixture discharged from the crankshaft chamber, realizes air filtering and oil filtering, and ensures stable performance of the air compressor. In addition, the bolt type air filter has a simple structure, a small size, and is convenient to process and assemble, and is flexible to use.

[0006] According to one aspect of the present application, a bolt type air filter is provided, comprising: a bolt type housing comprising a threaded rod with an internal cavity, a smooth section of the threaded rod being provided with a through hole communicating with the cavity; a filter element accommodated in the cavity, the filter element being provided with a filter cavity with one open end and the other sealed end, the bolt type air filter having an air filtering passage passing through the filter element from the filter cavity to the through hole.

[0007] In some embodiments, the sealed end of the filter element extends to the position of the through hole.

[0008] In some embodiments, the outer diameter and the inner diameter of the filter element decrease from the open end to the sealed end of the filter element.

[0009] In some embodiments, the filter cartridge has a threaded connection portion that is threaded to an end of the threaded segment of the threaded rod.

[0010] In some embodiments, the filter cartridge further has a sintered brass body portion connected to the threaded connection portion.

[0011] In some embodiments, the through hole includes a plurality of through holes distributed along the smooth segment.

[0012] According to yet another aspect of the present application, there is provided a filter passage structure of an air compressor, comprising: an air filter passage built in a bolt-type air filter, through which an air intake chamber of the air compressor is fixed to the air compressor; the air intake chamber is communicated to a piston chamber of the air compressor, the piston chamber is communicated to the air filter passage through a crank chamber of the air compressor, and the air filter passage is communicated to the air intake chamber.

[0013] In some embodiments, the air filter passage is communicated to the air intake chamber, and the crank chamber is communicated to the air intake chamber, so that the air pressure of the crank chamber is maintained at atmospheric pressure.

[0014] In some embodiments, the bolt-type air filter has a structure as described in any of the above embodiments.

[0015] In some embodiments, the bolt-type air filter has a filter cartridge through which gas passes and oil is blocked; the air filter passage filters the oil-gas mixture discharged from the crank chamber, so that the gas passes through the filter cartridge to the air intake chamber, and the oil flows back to the crank chamber.

[0016] In some embodiments, the air intake chamber is provided with an air suction port; when the air compressor sucks air, the gas flowing through the air filter passage to the air intake chamber is mixed with the gas sucked into the air intake chamber, and is supplied to the piston chamber.

[0017] In some embodiments, the filter passage structure further comprises: an air flow passage that communicates the air filter passage and the air intake chamber.

[0018] In some embodiments, the air filter passage and the air flow passage are both built in the air compressor.

[0019] In some embodiments, the filter passage structure further comprises: an air intake passage that communicates the air intake chamber and the piston chamber, the air intake passage is formed as a hose that leads from the air intake chamber to the piston chamber.

[0020] In some embodiments, the crankshaft chamber comprises a crankshaft working chamber and a crankshaft end chamber; the piston chamber communicates to the air filtering passage through the crankshaft working chamber and the crankshaft end chamber in sequence.

[0021] According to still another aspect of the present application, there is provided an air compressor, a filtering air passage structure of which is as described in any of the above embodiments.

[0022] The present application has at least the following advantages compared with the prior art:

[0023] The bolt type air filter of the present application realizes fastening effect through the bolt type shell and the threaded rod; realizes air filtering effect through the filter element accommodated in the cavity of the threaded rod, forming an air filtering passage from the filtering cavity of the filter element to the through hole of the threaded rod; and the overall structure of the bolt type air filter is simple and small in size, facilitating processing and assembly and flexible use.

[0024] The bolt type air filter is arranged in the air passage of the air compressor, specifically in the air passage of the crankshaft chamber leading to the air inlet storage chamber, which not only realizes fixed connection but also filters the oil-gas mixture discharged from the crankshaft chamber, realizes air filtering and oil filtering, reduces the oil leakage amount of the air compressor, and ensures stable performance of the air compressor.

[0025] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and are not limiting to the present application. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application. It is clear that the drawings described below are only some embodiments of the present application, and other drawings can be obtained from these drawings without creative labor for those skilled in the art.

[0027] Figure 1 Fig. 1 shows a structural schematic diagram of the bolt type air filter in the embodiment of the present application;

[0028] Figure 2 Fig. 2 shows a module schematic diagram of the filtering air passage structure of the air compressor in the embodiment of the present application;

[0029] Figure 3 and Figure 4 Fig. 3 shows an example schematic diagram of the filtering air passage structure of the air compressor in the embodiment of the present application. DETAILED DESCRIPTION

[0030] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to make this disclosure thorough and complete and to fully convey the concepts of the example embodiments to those skilled in the art.

[0031] The accompanying drawings are merely schematic illustrations of the present invention and are not necessarily drawn to scale. Identical reference numerals in the figures denote identical or similar parts, and thus repetitive descriptions thereof will be omitted. Some of the blocks shown in the accompanying drawings are functional entities that do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and features in different embodiments may be combined with each other.

[0033] Figure 1 The structure of the bolt-type air filter in the embodiment of the present invention is shown; Figure 1 As shown, the bolt-type air filter 10 provided in this embodiment mainly comprises:

[0034] The bolt-type housing 11 includes a threaded rod 12 with a cavity therein, and a through hole 121 communicating with the cavity is formed in a smooth section 12a of the threaded rod 12;

[0035] The filter element 13 is placed in the cavity, and one end of the filter element 13 is opened (with Figure 1 From the perspective shown, one end of the opening is the lower end of the filter element 13) and the other end is sealed (with Figure 1 As shown in the perspective, one end of the seal is the filter cavity 131 of the upper end of the filter element 13, and the bolt-type air filter 10 has an air filtration channel from the filter cavity 131 through the filter element 13 to the through hole 121.

[0036] Reference Figure 1 In the air filtration channel indicated by the dotted arrow, the gas to be filtered enters the filter cavity 131 from the open end 13a of the filter element 13, then passes through the filter element 13, and the filtered gas is discharged from the bolt-type air filter 10 through the through hole 121.

[0037] The bolt type air filter 10 is fastened by the bolt type shell 11 and the threaded rod 12, and the filter element 13 accommodated in the cavity of the threaded rod 12 forms the air filtering passage through which the filtering cavity 131 of the filter element 13 passes to the through hole 121 of the threaded rod 12 to realize the air filtering function. The through hole 121 is arranged on the smooth section 12a of the threaded rod 12, and will not affect the gas flow due to the screwing of the bolt type air filter 10, so that the bolt type air filter 10 can have the functions of fastening and air filtering. In addition, the overall structure of the bolt type air filter 10 is simple, small in size, convenient to process and assemble, and flexible to use.

[0038] In one embodiment, the sealed end 13b of the filter element 13 extends to the position of the through hole 121. Thus, when the gas enters the filtering cavity 131 and flows along the filtering cavity 131 to the sealed end 13b of the filter element 13, it can pass through the filter element 13 and be smoothly discharged from the through hole 121.

[0039] In one embodiment, the outer diameter and the inner diameter of the filter element 13 decrease from the open end 13a to the sealed end 13b. Thus, the filter element 13 is formed in a tapered structure from the open end 13a to the sealed end 13b, so that a certain gap is reserved between the portion near the sealed end 13b and the inner wall of the cavity of the threaded rod 12, facilitating the discharge of the gas from the sealed end 13b. In addition, the filter element 13 is formed in a tapered structure from the open end 13a to the sealed end 13b, which can also guide the gas entering the filtering cavity 131 to flow along the filtering cavity 131 to the sealed end 13b for discharge.

[0040] In one embodiment, the through hole 121 includes a plurality of through holes distributed on the smooth section 12a. Preferably, the plurality of through holes 121 can be uniformly distributed on the smooth section 12a, so that the gas discharged from the sealed end 13b can be uniformly discharged from the bolt type air filter 10 through the plurality of through holes 121.

[0041] In one embodiment, the filter element 13 has a threaded connection portion 132 which is screwed to the end of the threaded section 12b of the threaded rod 12. That is, in this embodiment, in addition to the outer wall of the threaded rod 12 being provided with external threads to realize the fastening function of the bolt type air filter 10, the inner wall of the end thereof is also provided with internal threads for screwing the threaded connection portion 132, so as to stably accommodate the filter element 13 in the threaded rod 12.

[0042] In one embodiment, the filter element 13 also has a sintered brass body portion 133 connected to the threaded connection portion 132. Thus, in this embodiment, the main body portion of the filter element 13 is formed by sintered brass, which can utilize the structural characteristics of sintered brass in filtering small molecules and blocking large molecules, to achieve the air venting and oil filtering functions of the bolt-type air filter 10, i.e., to make the gas pass through the filter element 13 and be discharged, while the oil molecules are blocked by the filter element 13 and flow back through the open end 13a.

[0043] In summary, the bolt-type air filter 10 of the present application, by virtue of its bolt-type shape and the built-in air filtering passage, can achieve both fastening and air filtering functions, and can be applied to any device that needs to filter gas, to achieve fastening connection while serving as an air flow passage and filtering the air flowing therethrough. Moreover, the bolt-type air filter 10 of the present application has a simple overall structure, small size, and is convenient to process and assemble, and flexible to use.

[0044] The embodiments of the present application also provide a filter air passage structure of an air compressor, which is equipped with the bolt-type air filter. The air compressor is specifically a piston-type air compressor, and the bolt-type air filter can be the bolt-type air filter 10 described in any of the above embodiments. The structure and principle of the bolt-type air filter 10 described in any of the above embodiments can be applied to the following embodiments of the filter air passage structure of the air compressor. In the following embodiments of the filter air passage structure of the air compressor, the structure and principle of the bolt-type air filter 10 that have been described will not be repeated.

[0045] Figure 2 is a schematic diagram of a module of the filter air passage structure of the air compressor in the embodiments of the present application, Figure 3 and Figure 4 is a schematic diagram of an example of the filter air passage structure of the air compressor in the embodiments of the present application; wherein, Figure 3 mainly shows the air filtering passage of the air compressor and the air passage portion connected to the air filtering passage, Figure 4 mainly shows the air passage portion connected to the air inlet storage cavity of the air compressor; Figure 3 and Figure 4 in which the flow direction of the gas in the air compressor is shown by the dashed arrows.

[0046] In combination with Figures 1 to 4 shown, the filter air passage structure of the air compressor provided by the embodiments of the present application mainly includes:

[0047] an air filtering passage 25, which is built in the bolt-type air filter 10, and the air inlet storage cavity 21 of the air compressor 20 is fixed to the air compressor 20 through the bolt-type air filter 10;

[0048] The intake air storage chamber 21 is connected to the piston chamber 23 of the air compressor 20 . The piston chamber 23 is connected to the air filter passage 25 via the crank chamber 24 of the air compressor 20 . The air filter passage 25 is connected to the intake air storage chamber 21 .

[0049] It should be noted that the described interconnectedness of intake air reservoir chamber 21 → piston chamber 23 → crankshaft chamber 24 → air filter passage 25 → intake air reservoir chamber 21 corresponds to the filter air passage structure associated with bolt-on air filter 10 in air compressor 20. In the overall air passage structure of air compressor 20, most of the compressed air in piston chamber 23 is output through the air outlet of air compressor 20 to the vehicle's air reservoir for use by the vehicle. In addition, a small amount of gas in piston chamber 23 inevitably enters crankshaft chamber 24, where it is further filtered through air filter passage 25 and returned to intake air reservoir chamber 21.

[0050] Thus, a filtering air passage with filtering function of the air compressor 20 is formed through the air filtering passage 25: intake air storage chamber 21 → piston chamber 23 → crankshaft chamber 24 → air filtering passage 25 → intake air storage chamber 21.

[0051] By setting the bolt-type air filter 10 in the air duct of the air compressor 20, the air filtration channel 25 built into the bolt-type air filter 10 is connected to the air duct from the crankshaft chamber 24 to the intake air storage chamber 21, which can not only play the role of fixed connection, but also filter the oil-air mixture discharged from the crankshaft chamber 24, realize ventilation and oil filtration, thereby reducing the oil blowby amount of the air compressor 20 and ensuring the stable performance of the air compressor 20.

[0052] In one embodiment, as the air filter passage 25 is connected to the intake air storage chamber 21 , the crank chamber 24 is connected to the intake air storage chamber 21 , so that the air pressure of the crank chamber 24 is maintained at atmospheric pressure.

[0053] Through the air filter channel 25, a passage is formed between the crankshaft chamber 24 and the intake air storage chamber 21, ensuring that the crankshaft can maintain normal operation under atmospheric pressure.

[0054] In one embodiment, the bolt-type air filter 10 has a filter element 13 for allowing gas to pass through and blocking oil; the air filter channel 25 filters the oil-gas mixture discharged from the crankshaft chamber 24, allowing the gas to pass through the filter element 13 and flow to the air intake storage chamber 21, thereby realizing the recycling of the gas and allowing the oil to flow back to the crankshaft chamber 24 to achieve lubrication of the crankshaft.

[0055] In one embodiment, the air intake cavity 21 is provided with an air suction port 210; when the air compressor 20 inhales, the gas flowing to the air intake cavity 21 through the air filtering channel 25 mixes with the gas sucked into the air intake cavity 21 from the air suction port 210, and is supplied to the piston chamber 23.

[0056] Thus, the partial gas in the air compressor 20 is recycled: from the piston chamber 23 to the crankshaft chamber 24, discharged from the crankshaft chamber 24 and filtered through the air filtering channel 25 to remove oil molecules, into the air intake cavity 21, and with the inhaled gas to the piston chamber 23 for compression and into the vehicle air supply system (the vehicle equipped with the air compressor 20).

[0057] In one embodiment, the filtering air passage structure of the air compressor 20 further comprises: an air flow channel 26, which is connected to the air filtering channel 25 and the air intake cavity 21. The air filtering channel 25 and the air intake cavity 21 are connected to form a passage through the air flow channel 26.

[0058] Further, in one embodiment, the air filtering channel 25 and the air flow channel 26 are both built-in in the air compressor. Thus, the built-in filtering air passage of the air compressor 20 is formed: air intake cavity 21→piston chamber 23→crankshaft chamber 24→air filtering channel 25→air flow channel 26→air intake cavity 21, which can simplify the peripheral arrangement of the air compressor 20 and reduce the occupied volume of the air compressor 20.

[0059] In one embodiment, the filtering air passage structure of the air compressor 20 further comprises: an air inlet channel 22, which is connected to the air intake cavity 21 and the piston chamber 23. The air inlet channel 22 can be formed as a hose leading from the air intake cavity 21 to the piston chamber 23.

[0060] In one embodiment, the crankshaft chamber 24 includes a crankshaft working chamber 241 and a crankshaft end chamber 242; then the piston chamber 23 is connected to the air filtering channel 25 through the crankshaft working chamber 241 and the crankshaft end chamber 242 in sequence.

[0061] The embodiment of the present application also provides an air compressor, and the filtering air passage structure of the air compressor is as described in any of the above embodiments, which will not be repeated here.

[0062] The working process of the air compressor 20 will be described below in conjunction with Figures 2 to 4 The working process of the air compressor 20 will be described below in conjunction with

[0063] In the primary compression process of the air compressor 20, the crankshaft 2 in the crankshaft working chamber 241 drives the movement of the piston in the piston chamber 23 (located in the inner cavity of the cylinder 1) to compress the air supplied into the piston chamber 23; at this time, a small part of the high-temperature compressed air in the piston chamber 23 will leak into the crankshaft working chamber 241 through the gap between the piston and the cylinder 1. Since the inner wall of the cylinder 1 and the journal of the crankshaft 2 are both lubricated by lubricating oil, after the high-temperature compressed air enters the crankshaft working chamber 241, it will mix with oil molecules to form an oil-gas mixture. Then, the oil-gas mixture in the crankshaft end chamber 242 enters the air filter passage 25 and the airflow passage 26, and the filtered oil molecules in the air filter passage 25 are blocked and only gas is allowed to enter the airflow passage 26. After that, the gas entering the airflow passage 26 passes through the air inlet of the air storage chamber 21 and enters the air storage chamber 21; and the filtered oil molecules accumulate in the crankshaft end chamber 242 to form oil liquid which flows back to the crankshaft working chamber 241 through the oil return hole to continue to lubricate the crankshaft 2 and the piston.

[0064] The gas entering the air storage chamber 21 is recycled and enters the piston chamber 23 through the air inlet passage 22 during the next air suction process of the air compressor 20, and becomes high-pressure gas by compressing the air with the piston and is sent to the vehicle air supply system.

[0065] In summary, the air compressor 20 can achieve the following beneficial effects through the air storage chamber 21→air inlet passage 22→piston chamber 23→crankshaft chamber 24→air filter passage 25→airflow passage 26→built-in filter airway of the air storage chamber 21:

[0066] The air filter passage 25 and the airflow passage 26 are built-in in the air compressor 20, without the need to set up external air connecting pipelines, which can simplify the peripheral arrangement of the air compressor 20 and reduce the occupied volume of the air compressor 20;

[0067] The bolt-type air filter 10 with the built-in air filter passage 25 has both fastening and air filtering functions, which can not only fix the air storage chamber 21 but also filter the gas discharged from the crankshaft chamber 24, reduce the oil leakage of the air compressor 20, realize gas recycling, and avoid direct discharge of oil-gas into the atmosphere to pollute the environment; and the bolt-type air filter 10 is small in size and flexible to use;

[0068] The air connection pipeline is externally arranged, and due to limited layout space, the air inlet is close to the oil tank, so that a large amount of oil gas mixture is inhaled; the air filter passage 25 is internally arranged, the internal space of the air compressor 20 is fully utilized, the air inlet of the air filter passage 25 can be far away from the oil tank, and in combination with the air filtering and oil filtering function of the air filter passage 25, the oil leakage amount of the air compressor 20 can be greatly reduced, so that the air compressor 20 can normally operate and be stable in performance.

[0069] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, a number of simple deductions or substitutions can be made without departing from the concept of the present application, and all of them shall be regarded as falling within the protection scope of the present application.

Claims

1. An air compressor filter duct structure, characterized by, The application relates to an air filter channel built in a bolt air filter arranged in an air passage of a crank chamber of an air compressor to an air inlet chamber of the air compressor, wherein the bolt air filter comprises a bolt shell with a threaded rod with a smooth section and a through hole communicating with a cavity in the threaded rod, and a filter core for passing air and blocking oil in the cavity, wherein the filter core is provided with a filter cavity with one open end and the other sealed end, and the air filter channel passes through the filter core from the filter cavity to the through hole. The air inlet chamber is communicated to a piston chamber of the air compressor, the piston chamber is communicated to the air filter channel through the crank chamber of the air compressor, and the air filter channel is communicated to the air inlet chamber, so that the air filter channel filters the oil-gas mixture discharged from the crank chamber, and the air passes through the filter core to the air inlet chamber, and the oil returns to the crank chamber. The sealed end of the filter core extends to the position of the through hole. The outer diameter and the inner diameter of the filter core decrease from the open end to the sealed end.

2. The filtering airway structure of claim 1, wherein, The filter core is provided with a threaded connection part screwed to the end of the threaded section of the threaded rod.

3. The filtering airway structure of claim 1, wherein, The filter core is further provided with a sintered brass main part connected to the threaded connection part.

4. The filtering airway structure of claim 1, wherein, The through hole comprises a plurality of through holes distributed in the smooth section.

5. A filtering airway structure as claimed in claim 4, wherein The air filter channel is communicated to the air inlet chamber, the crank chamber is communicated to the air inlet chamber, and the air pressure of the crank chamber is maintained at atmospheric pressure.

6. The filtering airway structure of claim 1, wherein, The air inlet chamber is provided with an air inlet; 7. The filtering airway structure of claim 1, wherein When the air compressor inhales, the air flowing through the air filter channel to the air inlet chamber is mixed with the air inhaled by the air inlet chamber, and is supplied to the piston chamber.

8. The filtering airway structure of claim 1, wherein, The application further relates to an air flow channel communicating the air filter channel and the air inlet chamber. The air filter channel and the air flow channel are built in the air compressor.

9. The filtering airway structure of claim 1, wherein, The application further relates to an air inlet channel communicating the air inlet chamber and the piston chamber, and the air inlet channel is formed as a hose from the air inlet chamber to the piston chamber. The crank chamber comprises a crank working chamber and a crank end chamber.

10. The filtering airway structure of claim 9, wherein, The piston chamber is communicated to the air filter channel through the crank working chamber and the crank end chamber.

11. The filtering airway structure of claim 1, wherein The filter air passage structure of the air compressor is as described in any one of claims 1-12. ​ 12. The filtering airway structure of claim 1, wherein, ​ ​ 13. An air compressor characterized by, ​

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