Air inlet silencing air filter of air compressor of commercial vehicle

Abstract

The invention provides an air inlet silencing air filter for an air compressor of a commercial vehicle, which belongs to the technical field of air filters and comprises an air filter body and a silencing cone. A primary filter element and a main filter element which are axially aligned and isolated from each other are arranged in the air filter body, an air inlet and an air outlet are formed in the two ends of the air filter body respectively, the air inlet is communicated with the isolated space outside the primary filter element, and the air outlet is communicated with an inner cavity of the main filter element. The silencing conical cylinder coaxially penetrates through the interior of the primary filter element, the conical bottom faces the main filter element and is in sealed connection with the inner cavity wall of the primary filter element, an inner cavity of the primary filter element is divided into a conical inner cavity and a conical outer cavity by the silencing conical cylinder, a first air hole is formed in the circumferential wall of the conical top of the silencing conical cylinder, and the conical inner cavity and the conical outer cavity are communicated through the first air hole; and the conical inner cavity is communicated with an isolation space outside the main filter element. According to the air inlet silencing air filter of the air compressor of the commercial vehicle, the compactness of an air inlet structure and the filtering and silencing effect of the air compressor of the commercial vehicle can be improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of air filters, and particularly relates to a commercial vehicle air compressor intake silencing air filter. BACKGROUND

[0002] Most commercial vehicles such as large passenger cars, heavy trucks, trucks and buses adopt air pressure braking mode, so the air compressor is an essential key component on the commercial vehicle, and the air intake of the air compressor needs to meet the cleanliness requirement to ensure the working efficiency and stability, therefore, the air intake of the air compressor needs to be installed with an air filter.

[0003] At present, the air filter for the air intake of the commercial vehicle air compressor is usually directly installed with a filter element in a shell, and a silencing device needs to be installed before the air filter to avoid the air intake noise of the air compressor. The air intake structure has the disadvantages that the single-stage filter element has poor filtering effect, and the effective service life of the filter element is short, and the filter element needs to be frequently maintained and replaced. In addition, since the silencing device occupies a large installation space, the air intake structure of the air compressor is not compact enough, which leads to difficult layout on the commercial vehicle. SUMMARY

[0004] The embodiment of the application provides a commercial vehicle air compressor intake silencing air filter, and aims to improve the compactness of the air intake structure of the commercial vehicle air compressor and the filtering and silencing effect.

[0005] To achieve the above object, the technical scheme adopted by the application is as follows: a commercial vehicle air compressor intake silencing air filter is provided, comprising: An air filter body is internally provided with an initial filter element and a main filter element which are axially aligned and isolated from each other, two ends of the air filter body are respectively provided with an air inlet and an air outlet, the air inlet is in communication with an isolated space outside the initial filter element, and the air outlet is in communication with an inner cavity of the main filter element; A silencing cone cylinder is coaxially arranged in the inner part of the initial filter element, and the bottom of the cone is directed towards the main filter element and is in sealing connection with the inner cavity wall of the initial filter element, the silencing cone cylinder divides the inner cavity of the initial filter element into a cone inner cavity and a cone outer cavity, the first gas hole is arranged on the top wall of the cone, the cone inner cavity and the cone outer cavity are in communication through the first gas hole, and the cone inner cavity is in communication with the isolated space outside the main filter element.

[0006] In a possible implementation manner, the air filter body comprises a shell, and the initial filter element and the main filter element; The inner part of the shell is provided with a partition plate and is divided into a first filter cavity and a second filter cavity, the center of the partition plate is provided with a positioning sleeve, one end of the positioning sleeve is open and extends into the first filter cavity, the other end of the positioning sleeve is closed and extends into the second filter cavity, and the second gas hole is arranged on the wall of the positioning sleeve extending into the second filter cavity; The conical bottom of the sound attenuation cone is sealingly inserted into the open end of the positioning sleeve; one end of the primary filter element is sealingly sleeved into the open end of the positioning sleeve, and the other end is sealingly connected to the end wall of the shell; one end of the main filter element is sealingly sleeved into the closed end of the positioning sleeve, and the other end is sealingly connected to the end wall of the shell.

[0007] In some embodiments, the shell comprises: an intermediate shell, an outer peripheral sleeve of which is sleeved with the base, one end of the intermediate shell being closed and forming a partition plate, and the other end of the intermediate shell being open; a first end shell, which is sealingly butted to the open end of the intermediate shell to form a primary filter cavity, the first end shell being provided with an air inlet opening upward, and the center of the first end shell being provided with a first insertion sleeve, which is sealingly inserted into the conical outer chamber; a second end shell, which is sealingly butted to the closed end of the intermediate shell to form a secondary filter cavity, the center of the second end shell being provided with an air outlet, and the center of the second end shell being provided with a second insertion sleeve, which is sealingly inserted into the main filter element.

[0008] For example, the center of the partition plate is provided with a connecting sleeve, a connecting rod is arranged on the connecting sleeve, and the connecting rod coaxially passes through the center of the sound attenuation cone and the first end shell and is screwed to the fastening operating member.

[0009] For example, the partition plate is spaced apart along the circumference of the positioning sleeve and is provided with a plurality of limiting ribs, each limiting rib being connected between the positioning sleeve and the connecting sleeve; the end of the sound attenuation cone inserted into the positioning sleeve is provided with a plurality of rotation-stopping grooves, each rotation-stopping groove being correspondingly clamped to each limiting rib; and the sidewall of the sound attenuation cone inserted into the positioning sleeve is provided with an avoiding groove, which is aligned with the second air hole.

[0010] In a possible implementation, the open end of the intermediate shell is provided with a first ring groove, and the first end shell is sealingly inserted into the first ring groove; the closed end of the intermediate shell is provided with a second ring groove, and the second end shell is sealingly inserted into the second ring groove, and the second end shell and the closed end of the intermediate shell are connected through a plurality of fastening points arranged in the circumferential direction.

[0011] In some embodiments, the inner end wall of the first end shell is provided with a flow guide arc plate, the flow guide arc plate extends around the outer periphery of the primary filter element, and the flow guide arc plate and the inner peripheral wall of the first end shell form an air inlet channel; the first end shell is vertically provided with an air inlet pipe along the tangential direction thereof, and the air inlet pipe is communicated with the air inlet channel through the air inlet opening.

[0012] For example, the top end of the air inlet pipe is provided with a rainproof cap, and the inside of the rainproof cap is provided with a filter grid.

[0013] For example, the circumferential wall of the first end shell is symmetrically provided with two groups of dust discharge holes upward and downward, each group of dust discharge holes is connected with a flexible sealing disc, and the flexible sealing disc is used to block the dust discharge hole under the action of the air inlet negative pressure of the primary filter cavity.

[0014] In some embodiments, the air outlet is connected with an air outlet pipe, one end of the air outlet pipe extends towards the middle part of the inner cavity of the main filter element, the other end penetrates out of the air filter body and is connected with a negative pressure switch.

[0015] The commercial vehicle air compressor intake sound-absorbing air filter provided by the present application has the beneficial effects that: compared with the prior art, the commercial vehicle air compressor intake sound-absorbing air filter of the present application integrally arranges the primary filter element and the main filter element in an axial alignment series layout mode in the air filter body, and the external air enters the air filter body through the air inlet, first passes through the primary filter element to filter out coarse particulate dust such as sand and flocculent matter carried in the air, and then passes through the main filter element to filter out fine dust, thereby not only improving the filtering effect and ensuring the air intake cleanliness of the air compressor, but also reducing the burden of the main filter element by setting the primary filtering process, thereby prolonging the maintenance cycle and effective service life of the main filter element.

[0016] After primary filtering, the air first enters the outer cone chamber, then enters the inner cone chamber through the first air holes located in the top peripheral wall of the sound-absorbing cone cylinder, and then flows from the bottom of the inner cone chamber to the isolation space outside the main filter element. In the air flow process, the air first flows from the peripheral area of the bottom of the sound-absorbing cone cylinder to the peripheral area of the top of the sound-absorbing cone cylinder in the outer cone space, and then flows from the inner area of the top of the sound-absorbing cone cylinder to the inner area of the bottom of the sound-absorbing cone cylinder in the inner cone space. Both processes are from a small space to a large space, so the process of air entering the main filter element from the primary filter element undergoes two expansions, and the air speed and pressure are reduced after each expansion. In this process, the air flow path is lengthened by multiple reflections and detours, which is more conducive to energy dissipation compared to the direct entry of the primary filter into the main filter. Therefore, the air flow noise problem is effectively improved, and the inner and outer cone surfaces of the sound-absorbing cone cylinder as the air flow guide surface can improve the smoothness of air flow, which is conducive to avoiding air turbulence and promoting noise elimination, thereby reducing the air intake noise of the air compressor.

[0017] The sound-absorbing cone cylinder integrally installed in the primary filter element replaces the role of the traditional external sound-absorbing device, thereby saving the space occupied by the external sound-absorbing device, improving the compactness of the commercial vehicle air compressor intake structure, and improving the installation layout flexibility and convenience. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The three-dimensional structure schematic diagram of the commercial vehicle air compressor intake sound-absorbing air filter provided by the embodiment of the present application; Figure 2 The half-section structure schematic diagram of the commercial vehicle air compressor intake sound-absorbing air filter provided by the embodiment of the present application; Figure 3 The cross-sectional structure schematic diagram along the A-A line of the embodiment of the present application; Figure 2 Figure 4 The three-dimensional structure schematic diagram of the sound-absorbing cone cylinder adopted by the embodiment of the present application;​ Figure 5 This is a three-dimensional structural diagram of the first end shell used in an embodiment of the present invention; Figure 6 This is a three-dimensional structural diagram of the intermediate shell used in an embodiment of the present invention; Figure 7 This is a three-dimensional structural diagram of the intermediate shell used in an embodiment of the present invention at another angle; Figure 8 This is a three-dimensional structural diagram of the second end shell used in an embodiment of the present invention.

[0019] In the diagram: 10. Air filter body; 101. Primary filter chamber; 102. Secondary filter chamber; 11. Intermediate shell; 111. Partition plate; 112. Positioning sleeve; 1121. Second air hole; 1122. Stepped stop surface; 1123. Chamfer; 113. Connecting sleeve; 114. Connecting rod; 115. Fastening operating component; 116. Limiting rib; 117. First annular groove; 118. Second annular groove; 12. Base; 13. First end shell; 131. First insert sleeve; 132. Guide arc plate; 133. Inlet channel; 134. 135. Air tube; 135. Rain cap; 1351. Filter grid; 136. Dust discharge hole; 137. Flexible sealing plate; 138. First support rib; 14. Second end shell; 141. Second insert; 142. Fastening point; 143. Air outlet tube; 144. Negative pressure switch; 145. Second support rib; 20. Primary filter element; 30. Main filter element; 40. Silencing cone; 401. Cone inner chamber; 402. Cone outer chamber; 403. First air hole; 404. Anti-rotation groove; 405. Clearance groove; 406. Perforation; 50. Sealing ring. Detailed Implementation

[0020] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0021] It should be noted that when an element is referred to as being "set on" or "connected to" another element, it can be directly on or indirectly on the other element. It should be understood that the terms "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0022] Please refer to the following: Figures 1 to 8 The present invention will now describe the air intake silencer air filter for commercial vehicle air compressors. The commercial vehicle air compressor intake silencer air filter includes an air filter body 10 and a silencer cone 40. The air filter body 10 has an axially aligned and mutually isolated primary filter element 20 and main filter element 30. The air filter body 10 has an air inlet and an air outlet at both ends. The air inlet is connected to the isolation space outside the primary filter element 20, and the air outlet is connected to the inner cavity of the main filter element 30. The silencer cone 40 is coaxially inserted inside the primary filter element 20, with the cone bottom facing the main filter element 30 and sealed to the inner cavity wall of the primary filter element 20. The silencer cone 40 divides the inner cavity of the primary filter element 20 into an inner cone chamber 401 and an outer cone chamber 402. The cone top peripheral wall of the silencer cone 40 has a first air hole 403. The inner cone chamber 401 and the outer cone chamber 402 are connected through the first air hole 403, and the inner cone chamber 401 is connected to the isolation space outside the main filter element 30.

[0023] It should be noted that in this embodiment, both the pre-filter 20 and the main filter 30 can be paper filters. The micropores on the filter paper utilize physical filtration mechanisms such as interception, inertial impaction, and adsorption to trap dust. The micropore size of the pre-filter 20 is larger than that of the main filter 30. By using the pre-filter 20, coarse dust particles in the air can be intercepted, thereby significantly reducing the burden on the main filter 30. This not only helps extend the effective lifespan and maintenance cycle of the main filter 30 but also allows the main filter 30 to focus more on intercepting fine dust, increasing the filtration efficiency to over 99%, thus improving the filtration effect.

[0024] The air intake path of the commercial vehicle air compressor intake silencer air filter provided in this embodiment is as follows: outside air enters the isolation space outside the primary filter element 20 through the air intake port, and then passes through the primary filter element 20 into the outer cone chamber 402 (during this process, coarse particles such as sand and flocculent dust are blocked). The air flows along the outer cone wall of the silencer cone 40 in the outer cone chamber 402 and enters the first air hole 403 (during this process, the air expands for the first time as it flows from the small space to the large space in the outer cone chamber 402, and the speed and pressure decrease, resulting in reduced noise). The air enters the inner cone chamber through the first air hole 403. 401. Air moves towards the bottom of the silencer cone 40 within the cone chamber 401 and enters the isolation space outside the main filter element 30 from the bottom region of the silencer cone 40 (during this process, air flows from a small space to a large space within the cone chamber 401, undergoing a second expansion, further reducing speed and pressure, thus reducing noise again). Air then enters the interior of the main filter element 30 from the isolation space outside the main filter element 30 for secondary filtration (during this process, fine dust is filtered out). Finally, crystalline air forms in the inner cavity of the main filter element 30 and is discharged from the outlet to the air compressor's intake end. The entire intake path undergoes two filter boxes and two expansions for silencing, thereby improving the air compressor's intake silencing and filtration effects.

[0025] Compared with the prior art, the air filter for commercial vehicle air compressors provided in this embodiment integrates a pre-filter element 20 and a main filter element 30 in a series arrangement with axial alignment inside the air filter body 10. After the outside air enters the air filter body 10 through the air inlet, it first passes through the pre-filter element 20 to filter out coarse dust particles such as sand and flocculent matter carried in the air, and then passes through the main filter element 30 to filter out fine dust. This not only improves the filtration effect and ensures the cleanliness of the air intake of the air compressor, but also reduces the burden on the main filter element 30 by setting the pre-filtration process, thereby extending the maintenance cycle and effective life of the main filter element 30.

[0026] After primary filtration, the air first enters the outer chamber 402 of the cone, then enters the inner chamber 401 of the cone through the first air hole 403 located on the circumferential wall of the cone apex of the silencer cone 40, and then flows from the bottom of the inner chamber 401 to the isolation space outside the main filter element 30. During the airflow process, the air first flows from the outer region of the cone bottom to the outer region of the cone apex in the outer space of the silencer cone 40, and then flows from the inner region of the cone apex to the inner region of the cone bottom in the inner space of the silencer cone 40. Both of these processes are from a small space to a large space, so the air flows from the initial filtration... The process of filter element 20 entering the main filter element 30 involves two expansions. Each expansion reduces air velocity and pressure, and the airflow path is lengthened through multiple reflections and detours. This process is more conducive to energy dissipation than the method of directly entering the main filter after the primary filter, thereby effectively improving the airflow noise problem. At the same time, the inner and outer conical surfaces of the silencer cone 40 serve as airflow guiding surfaces, which can improve the smoothness of airflow, help avoid air turbulence, and promote noise elimination, thereby reducing the intake noise of the air compressor.

[0027] The use of a silencer cone 40 integrated inside the primary filter element 20 replaces the function of a traditional external silencer, thereby saving the space occupied by the external silencer and improving the compactness of the air intake structure of the commercial vehicle air compressor, as well as enhancing the flexibility and convenience of the installation layout.

[0028] In some embodiments, see Figure 2 , Figure 6 and Figure 7 The air filter body 10 includes a housing, a primary filter element 20, and a main filter element 30. The housing is divided into a primary filter chamber 101 and a secondary filter chamber 102 by a partition 111. A positioning sleeve 112 is provided at the center of the partition 111. One end of the positioning sleeve 112 is open and extends into the primary filter chamber 101, and the other end is closed and extends into the secondary filter chamber 102. A second air hole 1121 is provided on the peripheral wall of the positioning sleeve 112 extending into the secondary filter chamber 102. The bottom of the silencing cone 40 is sealed and inserted into the open end of the positioning sleeve 112. One end of the primary filter element 20 is sealed and sleeved into the open end of the positioning sleeve 112, and the other end is sealed and connected to the end wall of the housing. One end of the main filter element 30 is sealed and sleeved into the closed end of the positioning sleeve 112, and the other end is sealed and connected to the end wall of the housing.

[0029] The housing is equipped with a partition 111, which allows the exterior of the primary filter element 20 and the exterior of the main filter element 30 to each form a sealed isolation space. These two isolation spaces are the space of the primary filter chamber 101 located outside the primary filter element 20 and the space of the secondary filter chamber 102 located outside the main filter element 30, respectively, thereby preventing air from entering the secondary filter chamber 102 directly without primary filtration.

[0030] The two ends of the positioning sleeve 112 set in the center of the partition 111 can be used as the installation positioning of the primary filter element 20 and the main filter element 30 respectively. At the same time, it can also be inserted and fixed with the cone bottom of the silencer cone 40, i.e. the port of the cone inner chamber 401, thereby improving the overall integrity and compactness of the assembly of the primary filter element 20, the main filter element 30 and the silencer cone 40.

[0031] Based on this, the second air hole 1121 set on the periphery of the positioning sleeve 112 can connect the inner cavity of the silencing cone 40 to the space outside the main filter element 30 in the secondary filter chamber 102, so that the air after primary filtration can smoothly enter the secondary filter chamber 102 from the cone bottom position of the inner cavity 401. At the same time, the closed end of the positioning sleeve 112 completes the sealing of the inner cavity ports of the primary filter element 20 and the main filter element 30, thereby further improving the compactness of the overall structure.

[0032] It should be noted that, in order to ensure the installation stability and convenience of the pre-filter element 20 and the main filter element 30, both ends of the positioning sleeve 112 are provided with stepped stop surfaces 1122, and the outer edges at both ends are chamfered 1123. The stepped stop surfaces 1122 are used to axially limit the pre-filter element 20 and the main filter element 30, thereby preventing axial movement that would affect the insertion seal and thus ensuring the filtration effect. The chamfers 1123 facilitate the fitting of the inner cavity ports of the pre-filter element 20 and the main filter element 30 onto the positioning sleeve 112, thereby improving the ease of operation for disassembling and replacing the pre-filter element 20 and the main filter element 30.

[0033] As one specific embodiment of the aforementioned housing, please refer to Figures 2 to 8 The housing includes an intermediate shell 11, a first end shell 13, and a second end shell 14. A base 12 is fitted around the outer periphery of the intermediate shell 11. One end of the intermediate shell 11 is closed and forms a partition 111, while the other end of the intermediate shell 11 is open. The first end shell 13 is sealed and connected to the open end of the intermediate shell 11 to form a primary filter chamber 101. An air inlet is provided on the upper side of the first end shell 13, and a first insert 131 is provided at the center of the first end shell 13. The first insert 131 is sealed and connected to the outer conical chamber 402. The second end shell 14 is sealed and connected to the closed end of the intermediate shell 11 to form a secondary filter chamber 102. An air outlet is provided at the center of the second end shell 14, and a second insert 141 is provided at the center of the second end shell 14, which is wrapped around the outer periphery of the air outlet. The second insert 141 is sealed and connected to the main filter element 30.

[0034] The outer peripheral housing 11 is fitted with a base 12 and fixed to the installation position of the commercial vehicle. The first end housing 13 and the second end housing 14 are respectively installed on both sides of the intermediate housing 11, thereby meeting the need to disassemble the first end housing 13 and the second end housing 14 to replace the primary filter element 20 and the main filter element 30.

[0035] The closed end face of the intermediate shell 11 serves as a partition 111, which causes the first end shell 13 and the second end shell 14 to form mutually isolated primary filter chamber 101 and secondary filter chamber 102 based on the partition 111, thereby ensuring structural compactness.

[0036] The first insert 131 and the positioning sleeve 112, located at the center of the first end shell 13, are respectively sealed and inserted into both ends of the primary filter element 20, thereby ensuring the installation stability of the primary filter element 20. Furthermore, a first support rib 138 can be provided on the first end shell 13 to press against the end face of the primary filter element 20. The first support rib 138, in conjunction with the stepped stop surface 1122 on the positioning sleeve 112, jointly achieves axial positioning of the primary filter element 20, further improving the installation stability of the primary filter element 20.

[0037] Similarly, the second end shell 14 has a second insert 141 and a positioning sleeve 112 at its center, which are respectively sealed and inserted into both ends of the main filter element 30. This allows both ends of the main filter element 30 to be radially constrained, thereby improving the installation stability of the main filter element 30. Furthermore, the second end shell 14 can be provided with a second support rib 145 that presses against the end face of the main filter element 30. The second support rib 145, together with the stepped stop surface 1122 on the positioning sleeve 112, achieves axial positioning of the main filter element 30, further enhancing the installation stability of the main filter element 30.

[0038] For some possible implementations, please refer to [link / reference]. Figure 2 and Figure 6 A connecting sleeve 113 is provided at the center of the partition 111. A connecting rod 114 is provided on the connecting sleeve 113. The connecting rod 114 coaxially passes through the center of the silencer cone 40 and the first end shell 13 and is screwed and fastened to the operating component 115.

[0039] The connecting rod 114 can be a screw rod, with one end screwed into the inner hole of the connecting sleeve 113, and the other end passing through the first end shell 13 and then screwed into the fastening operating member 115, such as a hand-tightening nut. The cone top of the muffler cone 40 is provided with a through hole 406 suitable for the connecting rod 114 to pass through. The inner diameter of the through hole 406 matches the diameter of the connecting rod 114. Thus, the cone top of the muffler cone 40 can be radially positioned using the connecting rod 114, and the cone bottom of the muffler cone 40 can also be radially positioned by inserting it into the positioning sleeve 112. Therefore, both ends of the muffler cone 40 are achieved. A stable connection is achieved by using the fastening operating member 115 to abut against the outer wall of the first end shell 13, thereby driving the first end shell 13 to be tightly connected with the intermediate shell 11. This ensures the stable installation of the first end shell 13, resulting in a highly compact structure. Considering the short maintenance and replacement cycle of the primary filter element 20, the first end shell 13 can be removed simply by selecting the fastening operating member 115. After replacing the primary filter element 20, the first end shell 13 can be reinstalled and the fastening operating member 115 screwed on, thus ensuring the convenience of maintenance and replacement of the primary filter element 20.

[0040] It should be noted that, in order to prevent air leakage at the part where the connecting rod 114 protrudes from the first end shell 13, a sealing gasket can be installed between the fastening operating member 115 and the outer end wall of the first end shell 13.

[0041] For details, please refer to Figure 2 , Figure 4 and Figure 6 The aforementioned partition 111 has multiple limiting ribs 116 spaced apart along the circumference of the positioning sleeve 112, and each limiting rib 116 is connected between the positioning sleeve 112 and the connecting sleeve 113; the end of the silencing cone 40 inserted into the positioning sleeve 112 is provided with multiple anti-rotation grooves 404, and each anti-rotation groove 404 is respectively engaged with each limiting rib 116; wherein, the side wall inside the silencing cone 40 inserted into the positioning sleeve 112 is provided with a relief groove 405, and the relief groove 405 is aligned with the second air hole 1121.

[0042] The limiting rib 116 can establish a connection between the positioning sleeve 112 and the connecting sleeve 113, thereby improving the overall structural strength. At the same time, the limiting rib 116 can be engaged with the anti-rotation groove 404 opened on the muffler cone 40 to restrict the rotational freedom of the muffler cone 40, thereby improving the installation stability of the muffler cone 40 and preventing the muffler cone 40 from rotating and causing the clearance groove 405 to misalign with the second air hole 1121, thus ensuring the smooth flow of air.

[0043] It should be noted that, see Figure 2 , Figure 6 and Figure 7 In this embodiment, the open end of the intermediate shell 11 is provided with a first annular groove 117, and the first end shell 13 is sealed and inserted into the first annular groove 117; the closed end of the intermediate shell 11 is provided with a second annular groove 118, and the second end shell 14 is sealed and inserted into the second annular groove 118, and the second end shell 14 is connected to the closed end of the intermediate shell 11 through a plurality of fastening points 142 arranged circumferentially.

[0044] To ensure the sealing of the joint, the first annular groove 117 and the second annular groove 118 can be fitted with sealing rings 50. The first end shell 13 is inserted into the end face of the first annular groove 117 and the second end shell 14 is inserted into the end face of the second annular groove 118 to compress the corresponding sealing rings 50 and improve the sealing of the joint surface.

[0045] Considering that setting a pre-filter before the main filter element 30 can significantly extend the effective life of the main filter element 30, the main filter element 30 has a long maintenance and replacement cycle. In this case, the connection between the second end shell 14 and the intermediate shell 11 prioritizes reliability, so a fastening point 142 connection method is adopted. Specifically, several lugs can be arranged on the closed end peripheral wall of the intermediate shell 11 and the peripheral wall of the second end shell 14 as fastening points 142. The corresponding lugs are fastened together by bolts, thereby realizing the connection between the second end shell 14 and the intermediate shell 11 and ensuring the reliability of the connection.

[0046] In some embodiments, such as Figure 3 and Figure 5 As shown, the inner end wall of the first end shell 13 is provided with a flow guide arc plate 132, which extends around the outer periphery of the primary filter element 20, and forms an air intake channel 133 between the flow guide arc plate 132 and the inner peripheral wall of the first end shell 13; the first end shell 13 is vertically provided with an air intake pipe 134 along its tangential direction, and the air intake pipe 134 and the air intake channel 133 are connected through an air intake port.

[0047] By setting the guide arc plate 132, a curved and meandering air intake channel 133 can be formed, which can increase the resistance to sound wave propagation compared with the straight air intake method, thereby playing a role in noise reduction. On this basis, the air intake pipe 134 is set tangentially along the peripheral wall of the first end shell 13, so that the outside air can flow smoothly to the surface of the guide arc plate 132 after passing through the air intake pipe 134, thereby avoiding the problem of intake turbulence noise.

[0048] To prevent rainwater and larger debris from falling into the intake pipe 134, such as Figure 2 and Figure 3 As shown, the top of the air intake pipe 134 is provided with a rain cap 135, and the interior of the rain cap 135 is provided with a filter grid 1351. The filter grid 1351 can be a louvered structure composed of inclined baffles arranged in a staggered manner along the circumference of the air intake pipe 134. A gap is formed between adjacent inclined baffles to allow air to flow. This structure can meet the air intake requirements while blocking debris and rainwater across the entire cross section, thereby reducing the probability of external dust, suspended matter, lint, etc. being sucked into the air filter body 10.

[0049] Among the possible implementation methods, please combine... Figure 3 and Figure 5 It is understood that two sets of dust discharge holes 136 are symmetrically arranged on the upper and lower periphery of the first end shell 13. Each set of dust discharge holes 136 is connected to a flexible sealing plate 137. The flexible sealing plate 137 is used to block the dust discharge holes 136 under the negative pressure of the air intake of the first-stage filter chamber 101.

[0050] The flexible sealing disc 137 can be a disc structure made of flexible silicone rubber. A connecting rod 114 is set at the center of the flexible sealing disc 137. The connecting rod 114 slides through the shell wall of the first end shell 13. When the air compressor intakes air, a negative pressure is formed inside the air filter body 10. Therefore, the flexible sealing disc 137 is tightly pressed against the peripheral wall of the first end shell 13 under the action of negative pressure extraction, thus sealing the dust discharge hole 136. This can prevent outside air from entering the primary filter chamber 101 through the dust discharge hole 136. When the air compressor stops working and there is a lot of dust inside the first end shell 13, the dust falls onto the flexible sealing disc 137 through the dust discharge hole 136 and drives the flexible sealing disc 137 to deform downward under the gravity of the dust, thereby expelling the dust from the first end shell 13. This avoids the long-term accumulation of dust inside the first end shell 13, which would affect the filtration effect and the effective life of the primary filter element 20.

[0051] The reason for providing two sets of dust discharge holes 136 on the support is that the first end shell 13 can be installed at an angle that can be selected based on actual installation requirements (either the air intake pipe 134 faces upwards or downwards), and ensure that the downward-facing dust discharge hole 136 provides dust discharge capability at the selected installation angle.

[0052] Considering that the upward-facing dust discharge hole 136 is a spare or optional structure, in this embodiment, the upward-facing dust discharge hole is encapsulated with a cover, which seals the primary filter chamber 101 to ensure its airtightness.

[0053] It should be noted that you should refer to [link / reference]. Figure 1 and Figure 2 In this embodiment, the air outlet is connected to an air outlet pipe 143. One end of the air outlet pipe 143 extends toward the middle of the inner cavity of the main filter element 30, and the other end passes through the air filter body 10 and is connected to a negative pressure switch 144.

[0054] The function of the air outlet pipe 143 is twofold: firstly, to facilitate connection with the air inlet pipe 134 of the air compressor; and secondly, to form a longer air outlet channel by extending into the main filter element 30, thereby further extending the air intake path of the air compressor, thus dissipating sound wave energy and reducing noise.

[0055] The negative pressure switch 144 is an electrical switch that controls the on / off state of a circuit by sensing pressure changes. Here, the negative pressure switch 144 can be connected to the control system of a vehicle or air compressor. When the negative pressure switch 144 is triggered, the alarm circuit of the control system is activated, issuing an alarm and thus forming an intake blockage warning mechanism. Specifically, the negative pressure switch 144 can be preset with a critical pressure value. When the negative pressure value in the outlet pipe 143 exceeds this critical pressure value, the negative pressure switch 144 will be triggered, thereby reminding personnel to clean or replace the pre-filter 20 or the main filter 30 in a timely manner to prevent the air compressor's performance from deteriorating or even being damaged.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A commercial vehicle air compressor intake sound deadening air filter characterized by, The application relates to an air filter body, which comprises an initial filter core and a main filter core arranged in axial alignment and isolated from each other, an air inlet and an air outlet arranged at two ends of the air filter body respectively, the air inlet being communicated with an isolated space outside the initial filter core, and the air outlet being communicated with an inner cavity of the main filter core. The application further discloses an air silencing cone, which is coaxially arranged in the initial filter core, and the bottom of the cone is connected with the inner cavity wall of the initial filter core in a sealing mode and faces the main filter core, the inner cavity of the initial filter core is divided into a cone inner cavity and a cone outer cavity by the air silencing cone, a first air hole is arranged on the top wall of the cone, the cone inner cavity and the cone outer cavity are communicated through the first air hole, and the cone inner cavity is communicated with the isolated space outside the main filter core. The air filter body comprises a shell, the initial filter core and the main filter core.

2. The commercial vehicle air compressor intake sound attenuation air filter of claim 1, wherein, The inner part of the shell is provided with a partition plate, and is divided into a first filter cavity and a second filter cavity, the center of the partition plate is provided with a positioning sleeve, one end of the positioning sleeve is open and extends into the first filter cavity, the other end of the positioning sleeve is closed and extends into the second filter cavity, and a second air hole is arranged on the wall of the positioning sleeve extending into the second filter cavity. The bottom of the air silencing cone is sealingly inserted into the open end of the positioning sleeve, one end of the initial filter core is sealingly sleeved on the open end of the positioning sleeve, and the other end of the initial filter core is sealingly connected with the end wall of the shell; one end of the main filter core is sealingly sleeved on the closed end of the positioning sleeve, and the other end of the main filter core is sealingly connected with the end wall of the shell. The shell comprises:

3. The commercial vehicle air compressor intake sound attenuation air filter of claim 2 wherein, an intermediate shell, a base is sleeved on the outer periphery of the intermediate shell, one end of the intermediate shell is closed and forms the partition plate, and the other end of the intermediate shell is open; a first end shell, which is sealingly connected with the open end of the intermediate shell to form the first filter cavity, the first end shell is provided with the air inlet, and the center of the first end shell is provided with a first inserting sleeve which is sealingly inserted into the cone outer cavity; a second end shell, which is sealingly connected with the closed end of the intermediate shell to form the second filter cavity, the center of the second end shell is provided with the air outlet, and the center of the second end shell is provided with a second inserting sleeve which is sleeved on the outer periphery of the air outlet and is sealingly inserted into the main filter core. The center of the partition plate is provided with a connecting sleeve, a connecting rod is arranged on the connecting sleeve, and the connecting rod is coaxially arranged in the center of the air silencing cone and the first end shell and is screw-fastened with a fastening operation member.

4. The commercial vehicle air compressor intake sound attenuation air filter of claim 3 wherein, The partition plate is provided with a plurality of limiting ribs which are spaced apart along the periphery of the positioning sleeve, each limiting rib is connected between the positioning sleeve and the connecting sleeve, the end of the air silencing cone inserted into the positioning sleeve is provided with a plurality of rotation-stopping grooves, each rotation-stopping groove is correspondingly connected with each limiting rib, and the side wall of the air silencing cone inserted into the positioning sleeve is provided with an avoiding groove which is aligned with the second air hole.

5. The commercial vehicle air compressor intake sound attenuation air filter of claim 4 wherein, The open end of the intermediate shell is provided with a first ring groove, the first end shell is sealingly inserted into the first ring groove, the closed end of the intermediate shell is provided with a second ring groove, the second end shell is sealingly inserted into the second ring groove, and the second end shell and the closed end of the intermediate shell are connected through a plurality of fastening points arranged in a circumferential direction.

6. The commercial vehicle air compressor intake sound attenuation air filter of claim 4 wherein, ​ 7. The commercial vehicle air compressor intake sound attenuation air filter of claim 3 wherein, The inner end wall of the first end shell is provided with a flow guide arc plate, which extends around the outer periphery of the primary filter element, and forms an air inlet channel between the flow guide arc plate and the inner peripheral wall of the first end shell; the first end shell is vertically provided with an air inlet pipe along its tangential direction, and the air inlet pipe is communicated with the air inlet channel through the air inlet.

8. The commercial vehicle air compressor intake sound-attenuating air filter of claim 7 wherein, The top end of the air inlet pipe is provided with a rainproof cap, and the inside of the rainproof cap is provided with a filter grid.

9. The commercial vehicle air compressor intake sound-attenuating air filter of claim 3 wherein, The circumferential wall of the first end shell is symmetrically provided with two groups of dust discharge holes, and each group of the dust discharge holes is connected with a flexible sealing disc, which is used to block the dust discharge hole under the action of the air inlet negative pressure of the primary filter cavity.

10. The commercial vehicle air compressor intake sound-attenuating air filter of any one of claims 1-9, wherein, The air outlet is connected with an air outlet pipe, one end of the air outlet pipe extends towards the middle part of the inner cavity of the main filter element, the other end of the air outlet pipe penetrates out of the air filter body and is connected with a negative pressure switch.

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