Air flow meter

Abstract

The invention relates to the technical field of flow meters, in particular to an air flow meter which comprises a flow mechanism, the flow mechanism comprises a cylindrical shell, a mounting hole is formed in the circumferential surface of the shell, a mounting cylinder is fixedly connected in the mounting hole, an insertion core is detachably connected to the mounting cylinder, and the insertion core is detachably connected to the shell. One end of the shell is fixedly sleeved with a mounting ring, one end of the shell is connected with a connecting cylinder, a filter screen is detachably connected into the connecting cylinder, the connecting cylinder is located on the side, away from the mounting cylinder, of the mounting ring, the connecting cylinder is communicated with an air inlet end, and the end, away from the connecting cylinder, of the shell is communicated with an air outlet end; the air flow meter has the beneficial effects that the filter screen is detachably connected with the connecting cylinder, so that the filter screen can be detached from the connecting cylinder, the filter screen is convenient to replace, the filter screen is prevented from being blocked by dust in the long-time use process, air flow is prevented from being influenced, and a user can conveniently repair and maintain the air flow meter.

Description

Technical Field

[0001] The invention relates to the technical field of flow meters, and in particular to an air flow meter. Background Art

[0002] The air flow meter, also known as the air flow sensor, is one of the important sensors of the electronic fuel injection engine. It converts the inhaled air flow into an electrical signal and sends it to the electronic control unit (ECU). As one of the basic signals for determining fuel injection, it is a sensor for measuring the air flow inhaled into the engine. In order to obtain the best concentration of mixed gas under various operating conditions, the electronically controlled gasoline injection engine must correctly measure the amount of air inhaled into the engine at every moment, which is used as the main basis for the ECU to calculate (control) the amount of fuel injection. If the air flow sensor or circuit fails, the ECU cannot obtain the correct intake signal, and the fuel injection amount cannot be controlled normally, which will cause the mixture to be too rich or too lean, causing the engine to operate abnormally. There are many forms of air flow sensors for electronically controlled gasoline injection systems. Common air flow sensors can be divided into several types according to their structural types, such as blade (wing) type, core type, hot wire type, hot film type, and Karman vortex type.

[0003] At present, the commonly used one is the thermal film air flow meter. The thermal film air flow meter is provided with a filter at the inlet, which can filter the dust in the air. However, during long-term use, dust is easy to accumulate on the filter, affecting the air flow. The filter needs to be replaced regularly, which is troublesome to operate. The existing air flow meter, such as Chinese patent application CN201320000253.X, discloses a thermal mode air flow meter, which fixes the air flow meter housing and the air flow meter plug together with screws, so that the air flow meter housing can not only be reused, but also convenient for replacing the easily damaged air flow meter plug, and also convenient for cleaning the air flow meter housing; however, this technical solution only opens the housing, and cannot effectively handle the filter on the air flow meter.

[0004] Therefore, an air flow meter is needed to solve the above problems. Summary of the invention

[0005] In order to solve the above problem, that is, to solve the problem that the filter on the air flow meter is prone to accumulate dust and affect the air flow, the present invention provides an air flow meter.

[0006] An air flow meter comprises a flow mechanism, wherein the flow mechanism comprises a cylindrical shell, a mounting hole is opened on the circumferential surface of the shell, a mounting tube is fixedly connected in the mounting hole, a plug core is detachably connected to the mounting tube, a mounting ring is fixedly sleeved at one end of the shell, a connecting tube is connected to one end of the shell, a filter screen is detachably connected in the connecting tube, the connecting tube is located on a side of the mounting ring away from the mounting tube, the connecting tube is connected to an air inlet end, and an end of the shell away from the connecting tube is connected to an air outlet end.

[0007] Specifically, when in use, the insert is installed in the shell through the installation tube, and then the filter is installed on the connecting tube, and then the connecting tube is connected with the air inlet end, and the other end of the shell is connected with the air outlet end, and then the flow meter is installed on the body through the installation ring; when the flow meter needs to be repaired, the insert is removed from the installation tube, replaced with a new insert, and then the filter is removed from the connecting tube, and the new filter is installed in the connecting tube.

[0008] Through the detachable connection between the filter and the connecting tube, the filter can be removed from the connecting tube, which is convenient for replacing the filter and avoids the filter being clogged by dust during long-term use, affecting the flow of air, making it convenient for users to repair and maintain the air flow meter.

[0009] Preferably, the connecting cylinder is connected with a replacement mechanism, which includes a connecting pipe connected to the air inlet end, the connecting pipe is connected to the connecting cylinder, and the replacement mechanism also includes a motor, the output end of the motor is fixedly connected to a fixing rod, the two ends of the fixing rod are respectively fixedly connected to the connecting cylinder, and a filter is detachably connected in each of the connecting cylinders.

[0010] Specifically, in the initial state, the connecting cylinder located at the lower end of the fixed rod is connected to the connecting pipe and the shell; when the flow meter is used for a long time, the motor is started, and the output end of the motor drives the fixed rod to rotate °, so that the connecting cylinder on the lower side rotates to the upper side, and the connecting cylinder on the lower side rotates to the lower side, so that the new connecting cylinder is connected to the connecting pipe and the shell, so that the new filter filters the air.

[0011] By setting up the replacement mechanism, the new connecting cylinder and the filter can be rotated to the lower side by the rotation of the motor, so that the new connecting cylinder and the filter are connected with the connecting pipe and the shell to filter the air, thereby realizing the replacement of the filter that has been used for a long time and reducing the impact of filter blockage on air flow.

[0012] Preferably, a closing piece is provided on the connecting tube, and the closing piece includes a closing ring slidably sleeved on both ends of the connecting tube, and a fixing block is symmetrically fixedly connected to the connecting tube, and two rod sleeves are symmetrically fixedly connected to the fixing block, and a sliding rod is slidably connected in each of the rod sleeves, and a spring is connected between the sliding rod and the rod sleeve, and the sliding rod is fixedly connected to the adjacent closing ring, and a bidirectional electric push rod is fixedly connected to the fixed rod, and the output ends of the bidirectional electric push rod are respectively fixedly connected with connecting rods, and the two connecting rods are respectively fixedly connected to the two rod sleeves.

[0013] Specifically, when in use, when the connecting tube needs to be rotated between the shell and the connecting tube, the two-way electric push rod is started, and the output end of the two-way electric push rod contracts. The output end of the two-way electric push rod drives the two closed rings to move toward each other through the two connecting rods, and the closed ring drives the sliding rod into the rod sleeve and compresses the spring; when the connecting tube is rotated between the shell and the connecting tube, the two-way electric push rod is started, and the output end of the two-way electric push rod drives the two closed rings to move away from each other through the two connecting rods, so that the two closed rings respectively close the gap between the connecting tube and the connecting tube and the gap between the shell and the connecting tube.

[0014] By setting the closing piece, after a new connecting tube is replaced between the connecting tube and the shell, the two closing rings can close the gap between the connecting tube, the connecting tube and the shell to prevent a large amount of air from flowing out from the gap and affecting the air intake of the machine body. In addition, by setting the bidirectional electric push rod, the two closing rings can be contracted when the connecting tube is replaced to facilitate the removal of the connecting tube from between the connecting tube and the shell.

[0015] Furthermore, the bidirectional electric push rod is a prior art and will not be described in detail.

[0016] Preferably, a mounting bracket is fixedly provided on the motor, the mounting bracket is fixedly connected to the machine body, a processing piece is arranged on the mounting bracket, and the processing piece includes a support rod fixedly connected to the mounting bracket, a first processing plate is fixedly connected to the top end of the support rod, a brush is arranged on a side of the first processing plate close to the upper connecting tube, the brush on the first processing plate contacts the filter in the connecting tube, a connecting bracket is fixedly connected to the top end of the first processing plate, a second processing plate is fixedly connected to the connecting bracket, the upper connecting tube is located between the first processing plate and the second processing plate, and a brush is arranged on a side of the second processing plate close to the upper connecting tube.

[0017] Specifically, when in use, when the lower connecting tube rotates upward, the connecting tube enters the gap between the first processing plate and the second processing plate, the filter in the connecting tube contacts the brushes on the first processing plate and the second processing plate, and the brush processes the dust on the filter.

[0018] Through the setting of the processing part, when replacing the connecting tube, the old connecting tube can be inserted between the first processing plate and the second processing plate, so that the brushes on the first processing plate and the second processing plate can process the filter on the old connecting tube, thereby reducing the dust on the filter, so that the connecting tube can be used subsequently.

[0019] Preferably, the first processing plate and the second processing plate are arc-shaped.

[0020] The arc-shaped arrangement of the first processing plate and the second processing plate enables the connecting tube to be in contact with more brushes on the first processing plate and the second processing plate during the rotation process.

[0021] Preferably, the processing member further comprises a cavity opened in the first processing plate, a side wall of the cavity close to the second processing plate is provided with a plurality of air holes, and a plurality of air holes are penetrated through the second processing plate.

[0022] Specifically, when in use, when the connecting tube enters between the first processing plate and the second processing plate, air is supplied to the cavity, and the gas in the cavity is blown onto the filter through the air holes, and the dust on the filter is processed with the help of a brush, and then the gas is blown out through the air holes.

[0023] By setting the cavity and the air holes, when the brushes on the first processing plate and the second processing plate process the dust on the filter, the gas blown out of the air holes processes the dust on the filter, so that the filter is processed more thoroughly and the processing effect is guaranteed.

[0024] Preferably, the processing member further comprises an air pipe fixedly arranged on the first processing plate, the air pipe is communicated with the cavity, the other end of the air pipe is communicated with the connecting pipe, and a solenoid valve is arranged in the air pipe.

[0025] Specifically, when it is needed to supply gas to the cavity during use, the solenoid valve is opened, and the gas in the connecting pipe enters the cavity through the air pipe and the solenoid valve; when the filter is replaced, the solenoid valve is closed.

[0026] By setting the air pipe, the gas can enter the cavity from the connecting pipe through the air pipe, and by setting the solenoid valve, the on and off of the air pipe can be controlled to ensure the normal operation of the flow meter.

[0027] Furthermore, the solenoid valve is a prior art and will not be described in detail.

[0028] Preferably, the mounting bracket comprises a mounting ring fixedly sleeved on the motor, two mounting rods are symmetrically arranged on the mounting ring, and a connecting fork is fixedly connected to the end of each mounting rod, and a connecting hole is opened on the connecting fork.

[0029] Specifically, when in use, the bolt is passed through the connecting hole, and then the bolt is connected to the machine body.

[0030] The mounting frame is mounted on the machine body by setting the connecting holes.

[0031] Preferably, a mounting groove is provided in the fixing rod, and the bidirectional electric push rod is fixedly connected in the mounting groove.

[0032] The bidirectional electric push rod can be installed by setting the installation groove.

[0033] Furthermore, the connecting pipe is fixedly connected to the machine body, and the shell is fixedly connected to the machine body.

[0034] The beneficial effects of the present invention are: 1. Through the detachable connection between the filter and the connecting tube, the filter can be removed from the connecting tube, which is convenient for replacing the filter and avoids the filter being blocked by dust during long-term use, affecting the flow of air, making it convenient for users to repair and maintain the air flow meter.

[0035] 2. By setting up the replacement mechanism, the new connecting cylinder and the filter can be rotated to the lower side by the rotation of the motor, so that the new connecting cylinder and the filter are connected with the connecting pipe and the shell to filter the air, thereby realizing the replacement of the filter that has been used for a long time and reducing the influence of the filter blockage on the air flow.

[0036] 3. By setting the sealing part, after the new connecting tube is replaced between the connecting tube and the shell, the two sealing rings can seal the gap between the connecting tube, the connecting tube and the shell to prevent a large amount of air from flowing out from the gap and affecting the air intake of the machine body. In addition, by setting the two-way electric push rod, the two sealing rings can be contracted when the connecting tube is replaced, so as to facilitate the removal of the connecting tube from between the connecting tube and the shell.

[0037] 4. Through the setting of the processing part, when replacing the connecting tube, the old connecting tube can be inserted between the first processing plate and the second processing plate, so that the brushes on the first processing plate and the second processing plate can process the filter on the old connecting tube, thereby reducing the dust on the filter, so that the connecting tube can be used subsequently.

[0038] 5. Through the setting of the cavity and the air hole, when the brushes on the first processing plate and the second processing plate process the dust on the filter, the gas blown out from the air hole processes the dust on the filter, so that the filter is processed more thoroughly and the processing effect is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ; Figure 2For the present invention Figure 1 The main view; Figure 3 For the present invention Figure 2 Isometric section view at AA; Figure 4 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ; Figure 5 For the present invention Figure 4 The main view; Figure 6 For the present invention Figure 5 Isometric section view at the middle BB; Figure 7 For the present invention Figure 6 A partial enlarged view of point C in the middle; Figure 8 For the present invention Figure 4 Left view of Fig. 9 For the present invention Figure 8 Isometric section view at mid DD; Fig.10 For the present invention Figure 8 Isometric section view at EE; Fig.11 For the present invention Fig.10 A partial enlarged view of point F in the middle.

[0040] In the figure: 1. Flow mechanism; 11. Shell; 12. Mounting tube; 13. Insert core; 14. Mounting ring; 15. Connecting tube; 16. Filter screen; 2. Replacement mechanism; 21. Connecting pipe; 22. Motor; 23. Fixing rod; 24. Closing piece; 241. Closing ring; 242. Fixing block; 243. Rod sleeve; 244. Sliding rod; 245. Spring; 246. Two-way electric push rod; 247. Connecting rod; 25. Mounting frame; 26. Processing piece; 261. Support rod; 262. First processing plate; 263. Connecting frame; 264. Second processing plate; 265. Cavity; 266. Air hole; 267. Air vent; 268. Air pipe; 269. Solenoid valve. DETAILED DESCRIPTION

[0041] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0042] like Figure 1 , 2As shown in Figure 3, an embodiment of the present invention discloses an air flow meter, including a flow mechanism 1, wherein the flow mechanism 1 includes a cylindrical shell 11, a mounting hole is opened on the circumferential surface of the shell 11, a mounting cylinder 12 is fixedly connected in the mounting hole, a plug core 13 is detachably connected to the mounting cylinder 12, a mounting ring 14 is fixedly sleeved on one end of the shell 11, a connecting cylinder 15 is connected to one end of the shell 11, a filter screen 16 is detachably connected to the connecting cylinder 15, the connecting cylinder 15 is located on a side of the mounting ring 14 away from the mounting cylinder 12, the connecting cylinder 15 is connected to an air inlet end, and an end of the shell 11 away from the connecting cylinder 15 is connected to an air outlet end.

[0043] Specifically, when in use, the insert 13 is installed in the shell 11 through the installation tube 12, and then the filter 16 is installed on the connecting tube 15, and then the connecting tube 15 is connected with the air inlet end, and the other end of the shell 11 is connected with the air outlet end, and then the flow meter is installed on the body through the installation ring 14; when the flow meter needs to be repaired, the insert 13 is removed from the installation tube 12 and replaced with a new one, and then the filter 16 is removed from the connecting tube 15, and the new filter 16 is installed in the connecting tube 15.

[0044] Through the detachable connection between the filter 16 and the connecting tube 15, the filter 16 can be removed from the connecting tube 15, which is convenient for replacing the filter 16, avoiding the filter 16 being clogged by dust during long-term use, affecting the flow of air, and facilitating the user to repair and maintain the air flow meter.

[0045] like Figure 4 , 6 As shown in , 9, the connecting cylinder 15 is connected to a replacement mechanism 2, and the replacement mechanism 2 includes a connecting pipe 21 connected to the air inlet end, and the connecting pipe 21 is connected to the connecting cylinder 15. The replacement mechanism 2 also includes a motor 22, and the output end of the motor 22 is fixedly connected to a fixing rod 23, and both ends of the fixing rod 23 are respectively fixedly connected to the connecting cylinder 15, and each of the connecting cylinders 15 is detachably connected to a filter screen 16.

[0046] Specifically, in the initial state, the connecting cylinder 15 located at the lower end of the fixed rod 23 is connected to the connecting pipe 21 and the shell 11; when the flow meter is used for a long time, the motor 22 is started, and the output end of the motor 22 drives the fixed rod 23 to rotate 180°, so that the lower connecting cylinder 15 rotates to the upper side, and the lower connecting cylinder 15 rotates to the lower side, so that the new connecting cylinder 15 is connected to the connecting pipe 21 and the shell 11, so that the new filter 16 filters the air.

[0047] By setting up the replacement mechanism 2, the new connecting cylinder 15 and the filter 16 can be rotated to the lower side by the rotation of the motor 22, so that the new connecting cylinder 15 and the filter 16 are connected with the connecting pipe 21 and the shell 11, and the air is filtered, thereby realizing the replacement of the filter 16 that has been used for a long time and reducing the influence of the blockage of the filter 16 on the air flow.

[0048] like Figure 4 , 7 As shown in Figure 11, a closing piece 24 is provided on the connecting tube 15, and the closing piece 24 includes a closing ring 241 slidably sleeved on both ends of the connecting tube 15, and a fixing block 242 is symmetrically fixedly connected to the connecting tube 15, and two rod sleeves 243 are symmetrically fixedly connected to the fixing block 242, and a sliding rod 244 is slidably connected in each of the rod sleeves 243, and a spring 245 is connected between the sliding rod 244 and the rod sleeve 243, and the sliding rod 244 is fixedly connected to the adjacent closing ring 241, and a bidirectional electric push rod 246 is fixedly connected to the fixed rod 23, and the output ends of the bidirectional electric push rod 246 are respectively fixedly connected with connecting rods 247, and the two connecting rods 247 are respectively fixedly connected to the two rod sleeves 243.

[0049] Specifically, when in use, when the connecting tube 15 needs to be rotated to between the shell 11 and the connecting tube 21, the two-way electric push rod 246 is started, and the output end of the two-way electric push rod 246 contracts. The output end of the two-way electric push rod 246 drives the two closed rings 241 to move toward each other through the two connecting rods 247, and the closed ring 241 drives the sliding rod 244 to enter the rod sleeve 243 and compresses the spring 245; when the connecting tube 15 is rotated to between the shell 11 and the connecting tube 21, the two-way electric push rod 246 is started, and the output end of the two-way electric push rod 246 drives the two closed rings 241 to move away from each other through the two connecting rods 247, so that the two closed rings 241 respectively close the gap between the connecting tube 21 and the connecting tube 15 and the gap between the shell 11 and the connecting tube 15.

[0050] By setting the closing piece 24, after the new connecting tube 15 is replaced between the connecting tube 21 and the shell 11, the two closing rings 241 can close the gap between the connecting tube 15 and the connecting tube 21 and the shell 11 to prevent a large amount of air from flowing out from the gap and affecting the air intake of the machine body. In addition, by setting the bidirectional electric push rod 246, the two closing rings 241 can be contracted when the connecting tube 15 is replaced, so as to facilitate the removal of the connecting tube 15 from between the connecting tube 21 and the shell 11.

[0051] Furthermore, the bidirectional electric push rod 246 is a prior art and will not be described in detail.

[0052] like Figure 4 , 5As shown in Figure 6, a mounting frame 25 is fixedly sleeved on the motor 22, and the mounting frame 25 is fixedly connected to the body. A processing member 26 is arranged on the mounting frame 25, and the processing member 26 includes a support rod 261 fixedly connected to the mounting frame 25, and a first processing plate 262 is fixedly connected to the top of the support rod 261, and a brush is arranged on a side of the first processing plate 262 close to the upper connecting tube 15, and the brush on the first processing plate 262 contacts the filter screen 16 in the connecting tube 15, and a connecting frame 263 is fixedly connected to the top of the first processing plate 262, and a second processing plate 264 is fixedly connected to the connecting frame 263, and the upper connecting tube 15 is located between the first processing plate 262 and the second processing plate 264, and a brush is arranged on the side of the second processing plate 264 close to the upper connecting tube 15.

[0053] Specifically, during use, when the lower connecting tube 15 rotates upward, the connecting tube 15 enters into the gap between the first processing plate 262 and the second processing plate 264, and the filter 16 in the connecting tube 15 contacts the brushes on the first processing plate 262 and the second processing plate 264, and the brush processes the dust on the filter 16.

[0054] Through the setting of the processing part 26, when replacing the connecting cylinder 15, the old connecting cylinder 15 can enter between the first processing plate 262 and the second processing plate 264, so that the brushes on the first processing plate 262 and the second processing plate 264 can process the filter 16 on the old connecting cylinder 15, thereby reducing the dust on the filter 16, so that the connecting cylinder 15 can be used subsequently.

[0055] like Figure 4 , 5 As shown, the first processing plate 262 and the second processing plate 264 are arc-shaped.

[0056] The arc-shaped arrangement of the first processing plate 262 and the second processing plate 264 enables the connecting tube 15 to come into contact with more brushes on the first processing plate 262 and the second processing plate 264 during the rotation process.

[0057] like Figure 6 As shown, the processing member 26 further includes a cavity 265 opened in the first processing plate 262 , a side wall of the cavity 265 close to the second processing plate 264 is provided with a plurality of air holes 266 , and a plurality of air holes 267 are penetrated through the second processing plate 264 .

[0058] Specifically, when in use, when the connecting tube 15 enters between the first processing plate 262 and the second processing plate 264, air is supplied to the cavity 265, and the gas in the cavity 265 is blown onto the filter 16 through the air hole 266, and the dust on the filter 16 is processed with a brush, and then the gas is blown out through the air hole 267.

[0059] By setting the cavity 265 and the air hole 266, when the brushes on the first processing plate 262 and the second processing plate 264 process the dust on the filter 16, the gas blown out from the air hole 266 processes the dust on the filter 16, making the processing of the filter 16 more thorough and ensuring the processing effect.

[0060] like Figure 6 As shown, the processing member 26 further includes an air pipe 268 fixedly disposed on the first processing plate 262 , the air pipe 268 is connected to the cavity 265 , the other end of the air pipe 268 is connected to the connecting pipe 21 , and an electromagnetic valve 269 is disposed in the air pipe 268 .

[0061] Specifically, when it is necessary to supply gas to the cavity 265 during use, the solenoid valve 269 is opened, and the gas in the connecting pipe 21 enters the cavity 265 through the air pipe 268 and the solenoid valve 269; when the filter 16 is replaced, the solenoid valve 269 is closed.

[0062] By setting the air pipe 268, the gas can enter the cavity 265 from the connecting pipe 21 through the air pipe 268, and by setting the solenoid valve 269, the on-off of the air pipe 268 can be controlled to ensure the normal operation of the flow meter.

[0063] Furthermore, the solenoid valve 269 is a prior art and will not be described in detail.

[0064] like Figure 4 As shown, the mounting bracket 25 includes a mounting ring fixedly sleeved on the motor 22, and two mounting rods are symmetrically arranged on the mounting ring. The end of each mounting rod is fixedly connected to a connecting fork, and the connecting fork is provided with a connecting hole.

[0065] Specifically, when in use, the bolt is passed through the connecting hole, and then the bolt is connected to the machine body.

[0066] By setting the connecting holes, the mounting bracket 25 is mounted on the machine body.

[0067] like Fig. 9 As shown, a mounting groove is provided in the fixing rod 23, and the bidirectional electric push rod 246 is fixedly connected in the mounting groove.

[0068] By setting the mounting groove, the bidirectional electric push rod 246 can be installed.

[0069] Furthermore, the connecting pipe 21 is fixedly connected to the machine body, and the shell 11 is fixedly connected to the machine body.

[0070] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0071] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0072] The term "comprise" or any other similar term is intended to cover a non-exclusive inclusion, such that a process, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, article, or apparatus / device.

[0073] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. An air flow meter, characterized in that: The flow mechanism (1) comprises a cylindrical shell (11), a mounting hole being provided on the circumferential surface of the shell (11), a mounting tube (12) being fixedly connected to the mounting hole, a plug core (13) being detachably connected to the mounting tube (12), a mounting ring (14) being fixedly sleeved on one end of the shell (11), a connecting tube (15) being connected to one end of the shell (11), a filter screen (16) being detachably connected to the connecting tube (15), the connecting tube (15) being located on a side of the mounting ring (14) away from the mounting tube (12), the connecting tube (15) being connected to an air inlet end, and an end of the shell (11) away from the connecting tube (15) being connected to an air outlet end.

2. An air flow meter according to claim 1, characterized in that: The connecting cylinder (15) is connected to a replacement mechanism (2), the replacement mechanism (2) comprising a connecting pipe (21) connected to the air inlet end, the connecting pipe (21) being connected to the connecting cylinder (15), the replacement mechanism (2) further comprising a motor (22), the output end of the motor (22) being fixedly connected to a fixing rod (23), the two ends of the fixing rod (23) being fixedly connected to the connecting cylinder (15), respectively, and a filter screen (16) being detachably connected to each connecting cylinder (15).

3. An air flow meter according to claim 2, characterized in that: The connecting tube (15) is provided with a closing member (24), the closing member (24) comprising closing rings (241) slidably sleeved on both ends of the connecting tube (15), the connecting tube (15) is symmetrically fixedly connected with a fixing block (242), the fixing block (242) is symmetrically fixedly connected with two rod sleeves (243), each of the rod sleeves (243) is slidably connected with a sliding rod (244), a spring (245) is connected between the sliding rod (244) and the rod sleeve (243), the sliding rod (244) is fixedly connected to the adjacent closing ring (241), the fixing rod (23) is fixedly connected with a bidirectional electric push rod (246), the output ends of the bidirectional electric push rod (246) are respectively fixedly connected with connecting rods (247), and the two connecting rods (247) are respectively fixedly connected to the two rod sleeves (243).

4. An air flow meter according to claim 3, characterized in that: A mounting frame (25) is fixedly sleeved on the motor (22), the mounting frame (25) being fixedly connected to the machine body, a processing member (26) being arranged on the mounting frame (25), the processing member (26) comprising a support rod (261) fixedly connected to the mounting frame (25), a first processing plate (262) being fixedly connected to the top end of the support rod (261), a brush being arranged on a side of the first processing plate (262) close to the upper connecting tube (15), the brush on the first processing plate (262) being in contact with the filter screen (16) in the connecting tube (15), a connecting frame (263) being fixedly connected to the top end of the first processing plate (262), a second processing plate (264) being fixedly connected to the connecting frame (263), the upper connecting tube (15) being located between the first processing plate (262) and the second processing plate (264), the second processing plate (264) being provided with a brush on a side of the upper connecting tube (15).

5. An air flow meter according to claim 4, characterized in that: The first processing plate (262) and the second processing plate (264) are arc-shaped.

6. An air flow meter according to claim 5, characterized in that: The processing element (26) further comprises a cavity (265) formed in the first processing plate (262), a side wall of the cavity (265) close to the second processing plate (264) being provided with a plurality of air holes (266), and a plurality of air holes (267) being provided through the second processing plate (264).

7. An air flow meter according to claim 6, characterized in that: The processing element (26) further comprises an air pipe (268) fixedly arranged on the first processing plate (262), wherein the air pipe (268) is in communication with the cavity (265), and the other end of the air pipe (268) is in communication with the connecting pipe (21), and a solenoid valve (269) is arranged in the air pipe (268).

8. An air flow meter according to claim 7, characterized in that: The mounting frame (25) comprises a mounting ring fixedly sleeved on the motor (22), two mounting rods being symmetrically arranged on the mounting ring, a connecting fork being fixedly connected to the end of each mounting rod, and a connecting hole being provided on the connecting fork.

9. An air flow meter according to claim 8, characterized in that: The fixing rod (23) is provided with a mounting groove, and the bidirectional electric push rod (246) is fixedly connected in the mounting groove.

10. An air flow meter according to claim 9, characterized in that: The connecting pipe (21) is fixedly connected to the machine body, and the shell (11) is fixedly connected to the machine body.

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