A fluid measuring box that is easy to install and maintain

Abstract

The present invention discloses a fluid measurement box that is easy to install and maintain, and belongs to the field of fluid measurement. A fluid measurement box that is easy to install and maintain includes a bottom plate, and also includes: a rectangular box with an opening downward, which is arranged at the upper end of the bottom plate, wherein a support vertical plate is fixedly connected to the middle of the bottom plate, and the support vertical plate is located in the rectangular box, and a lifting mechanism for driving the rectangular box to move up and down is provided on the bottom plate; a rectangular sealing plate is fixedly connected to the upper end of the bottom plate and cooperates with the inner wall of the lower port of the rectangular box, wherein a plurality of circular holes are provided at the lower end of the bottom plate; the present invention can make it more convenient for staff to install and maintain fluid detection equipment, and can also timely dissipate heat for the fluid detection equipment to ensure the working stability of the fluid detection equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid measurement, and in particular to a fluid measurement box which is easy to install and maintain. Background Art

[0002] The traditional temperature, pressure and flow integrated machine consists of an S-type pitot tube, a thermal resistor, a pressure / differential pressure transmitter, a backflush unit, etc. It is suitable for real-time continuous measurement of flue gas flow velocity, pressure, temperature and flow in the flue gas emission continuous monitoring system.

[0003] At present, the S-type Pitot tube, thermal resistor, pressure / differential pressure transmitter, backflush unit, etc. in the temperature-pressure-flow integrated machine are all installed in the measuring box, which can effectively isolate and protect the internal components. However, the overall structure of traditional equipment is cumbersome, and the layout of pipelines and lines is complicated, which will lead to cumbersome on-site installation and construction, and will also increase the difficulty of troubleshooting during later maintenance. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art that the overall structure of traditional equipment is cumbersome, the layout of pipelines and lines is complex, and it is not conducive to construction and maintenance, and to propose a fluid measurement box that is easy to install and maintain.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A fluid measuring box that is easy to install and maintain, includes a base plate, and also includes: a rectangular box with an opening facing downward, which is arranged at the upper end of the base plate, wherein a supporting vertical plate is fixedly connected to the middle of the base plate, and the supporting vertical plate is located in the rectangular box, and a lifting mechanism for driving the rectangular box to move up and down is provided on the base plate; a rectangular sealing plate, which is fixedly connected to the upper end of the base plate and cooperates with the inner wall of the lower port of the rectangular box, wherein a plurality of circular holes are provided at the lower end of the base plate.

[0007] In order to facilitate the lifting and lowering of the rectangular box, preferably, the lifting mechanism includes a driving motor fixedly mounted at the lower end of the base plate, and vertically upward device holes and guide holes are respectively provided on both sides of the upper end of the supporting vertical plate, wherein a reciprocating screw is rotatably connected in the device hole, and a reciprocating slider slidably connected to the inner wall of the device hole is threadedly connected to the outer wall of the reciprocating screw, and a guide rod fixedly connected to the top of the rectangular box is slidably connected in the guide hole, and the reciprocating slider is fixedly connected to the top of the rectangular box by a connecting rod; a driving gear is fixedly mounted on the output shaft of the driving motor, and a driven gear is mounted on the lower end of the reciprocating screw through a one-way bearing.

[0008] In order to dissipate heat for the fluid measuring equipment in the rectangular box, preferably, the supporting vertical plate is provided with symmetrically arranged air outlet holes and air inlet holes, and the lower ends of the air inlet holes and the air outlet holes extend to the lower end of the bottom plate, wherein the air outlet holes and the air inlet holes are connected to each other through a plurality of heat dissipation holes, and the lower port of the air outlet holes is provided with a negative pressure component for generating negative pressure.

[0009] In order to generate negative pressure at the lower port of the air outlet, preferably, the negative pressure component includes a rotating tube rotatably connected to the lower port of the air outlet, and a fan blade is fixedly installed on the inner wall of the rotating tube, wherein a ring gear is fixedly installed on the outer wall of the rotating tube, and the driving gear is meshingly connected with the ring gear, and a first filter is installed at the lower port of the rotating tube, and a second filter is installed at the lower port of the air inlet.

[0010] In order to automatically clean the second filter, preferably, the lower end of the base plate is slidably connected with a cleaning plate, the upper end of the cleaning plate is provided with a cleaning brush that cooperates with the second filter, and the lower end of the base plate is provided with a push-pull mechanism that drives the cleaning brush to move horizontally.

[0011] In order to drive the cleaning plate to move automatically, preferably, the push-pull mechanism includes a sleeve fixedly connected to the lower end of the base plate, a piston rod is slidably connected in the sleeve, and the end of the piston rod is fixedly connected to the cleaning plate, wherein a telescopic airbag is fixedly installed between the guide rod and the inner bottom of the guide hole, and the telescopic airbag is fixedly connected and communicated with the sleeve through a connecting tube.

[0012] In order to tilt the second filter screen, preferably, the lower port of the air inlet is fixedly connected to a fixed shaft, the second filter screen is rotatably connected to the fixed shaft, and a torsion spring is installed between the second filter screen and the fixed shaft.

[0013] In order to clean the inner walls of the air inlet and the air outlet, preferably, the air inlet and the air outlet are both provided with an annular plate that can move up and down, and the outer wall of the annular plate is provided with a brush that abuts against the inner walls of the air inlet and the air outlet.

[0014] In order to drive the annular plate to slide automatically, preferably, the inner top of the rectangular box is fixedly connected with two pull rods extending into the air inlet and the air outlet, and the two annular plates are respectively fixedly connected to the lower ends of the two pull rods.

[0015] In order to facilitate viewing of the interior of the rectangular box, further, a top plate is fixedly connected to the top of the rectangular box, and a transparent observation window is also provided on the front end surface of the rectangular box.

[0016] Compared with the prior art, the present invention provides a fluid measurement box that is easy to install and maintain, and has the following beneficial effects:

[0017] 1. The fluid measuring box which is easy to install and maintain, installs the detection equipment for detecting the fluid on the front and rear sides of the supporting vertical plate, and is used to connect the external pipe body through the circular hole. There is no obstruction on the front and rear sides of the supporting vertical plate, and the installation is extremely convenient. When the driving motor rotates forward, the rectangular box can be quickly separated from the fluid detection equipment, so that the staff can install and maintain the fluid detection equipment more conveniently.

[0018] 2. The fluid measuring box is easy to install and maintain. By reversing the driving motor, the rotating tube will allow the air inlet to inhale outside air. When the air passes through the air outlet, air inlet and heat dissipation holes, it will take away the heat on the supporting plate, thereby effectively dissipating the heat of the fluid detection equipment and preventing the fluid detection equipment from being in a high temperature state for a long time and affecting the measurement accuracy.

[0019] 3. The fluid measuring box which is easy to install and maintain can automatically clean the second filter by the guide rod sliding downward to press the telescopic airbag when the rectangular box moves downward, and the cleaning plate cleans the lower end of the second filter through the cleaning brush. When the guide rod slides upward with the rectangular box, the telescopic airbag will be stretched, and the cleaning plate slides in the opposite direction to reset, thereby cleaning the lower end of the second filter again.

[0020] 4. The fluid measuring box which is easy to install and maintain, when the driving motor rotates forward to make the second rectangular box slide upward and downward, the rotating tube will also rotate synchronously, so that the dust on the outer wall of the second filter can be blown off in the reverse direction. At this time, in combination with the moving cleaning brush, the self-cleaning effect of the second filter can be improved, and the first filter can prevent dust from entering the air outlet through the rotating tube.

[0021] 5. The fluid measuring box which is easy to install and maintain has a second filter that rotates and tilts on a fixed axis under the action of a torsion spring when the cleaning brush slides to the right end. The flowing air can also bring a small amount of dust that has entered the air outlet, air inlet and heat dissipation hole out of the air inlet, thereby ensuring the cleanliness of the inner walls of the air outlet, air inlet and heat dissipation hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the isometric structure of a fluid measuring box that is easy to install and maintain, as proposed by the present invention;

[0023] Figure 2 This is a schematic diagram of an axonometric cross-section structure of a fluid measurement box that is easy to install and maintain, as proposed by the present invention;

[0024] Figure 3 A schematic diagram of a partial axonometric structure of a fluid measuring box proposed by the present invention that is easy to install and maintain;

[0025] Figure 4This is a schematic diagram of the main cutaway structure of a fluid measuring box proposed by the present invention that is easy to install and maintain;

[0026] Figure 5 The present invention provides a fluid measuring box that is easy to install and maintain Figure 4 Enlarged view of part A;

[0027] Figure 6 The present invention provides a fluid measuring box that is easy to install and maintain Figure 4 Enlarged view of part B;

[0028] Figure 7 This is a schematic diagram of the cross-sectional structure of an annular plate of a fluid measuring box that is easy to install and maintain, as proposed by the present invention.

[0029] In the figure: 1. bottom plate; 2. rectangular box; 3. support plate; 4. driving motor; 5. installation hole; 6. guide hole; 7. guide rod; 8. reciprocating screw; 9. reciprocating slider; 10. connecting rod; 11. driving gear; 12. driven gear; 13. one-way bearing; 14. air outlet; 15. air inlet; 16. heat dissipation hole; 17. rotating tube; 18. fan blade; 19. ring gear; 20. round hole; 21. first filter screen; 22. fixed axis; 23. second filter screen; 24. cleaning plate; 25. sleeve; 26. piston rod; 27. cleaning brush; 28. telescopic airbag; 29. ​​connecting pipe; 30. torsion spring; 31. ring plate; 32. brush; 33. pull rod; 34. top plate; 35. rectangular sealing plate. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] Embodiment 1:

[0033] Reference Figure 1-Figure 7A fluid measuring box that is easy to install and maintain includes a bottom plate 1, and also includes: a rectangular box 2 with an opening facing downward, which is arranged at the upper end of the bottom plate 1, wherein a supporting vertical plate 3 is fixedly connected to the middle of the bottom plate 1, and the supporting vertical plate 3 is located in the rectangular box 2, and a lifting mechanism for driving the rectangular box 2 to move up and down is provided on the bottom plate 1; a rectangular sealing plate 35 is fixedly connected to the upper end of the bottom plate 1 and cooperates with the inner wall of the lower port of the rectangular box 2, wherein a plurality of circular holes 20 are provided at the lower end of the bottom plate 1, and the circular holes 20 are used to connect an external pipe body and a power source.

[0034] When in use, the detection equipment for detecting the fluid is installed on the front and rear sides of the supporting plate 3, and is used to connect the external pipe body through the circular hole 20. There is no obstruction on the front and rear sides of the supporting plate 3, and the installation will be extremely convenient. Then the rectangular box 2 is driven downward by the lifting mechanism. When the lower end of the rectangular box 2 is completely against the bottom plate 1, the supporting plate 3 and the fluid detection equipment can be covered in the rectangular box 2. When it is necessary to maintain and detect faults of the fluid detection equipment in the rectangular box 2, the rectangular box 2 is driven upward by the lifting mechanism again to slide it quickly from the fluid detection equipment, so that the staff can install and maintain the fluid detection equipment more conveniently.

[0035] Furthermore, a top plate 34 is fixedly connected to the top of the rectangular box 2, and a transparent observation window is also provided on the front face of the rectangular box 2. The top plate 34 can isolate and protect the top of the rectangular box 2, and the transparent observation window can facilitate the staff to observe the real-time situation inside the rectangular box 2.

[0036] Embodiment 2:

[0037] Reference Figure 2-Figure 6 , which is basically the same as Example 1, and further discloses a specific implementation scheme of the lifting mechanism.

[0038] The lifting mechanism includes a driving motor 4 fixedly mounted on the lower end of the base plate 1, and a vertically upward device hole 5 and a guide hole 6 are respectively provided on both sides of the upper end of the supporting vertical plate 3, wherein a reciprocating screw 8 is rotatably connected in the device hole 5, and a reciprocating slider 9 slidably connected to the inner wall of the device hole 5 is threadedly connected to the outer wall of the reciprocating screw 8. When the reciprocating screw 8 rotates, the reciprocating slider 9 will automatically slide back and forth along the outer wall of the reciprocating screw 8, and a guide rod 7 fixedly connected to the top of the rectangular box 2 is slidably connected in the guide hole 6, and the reciprocating slider 9 is fixedly connected to the top of the rectangular box 2 by a connecting rod 10; a driving gear 11 is fixedly mounted on the output shaft of the driving motor 4, and a driven gear 12 is mounted on the lower end of the reciprocating screw 8 through a one-way bearing 13.

[0039] When it is necessary to close the rectangular box 2, the driving motor 4 is rotated forward, and the driving motor 4 can drive the driven gear 12 to rotate through the active gear 11, and the driven gear 12 can drive the reciprocating screw 8 to rotate, and the reciprocating screw 8 can drive the reciprocating slider 9 to slide downward, and the reciprocating slider 9 can drive the rectangular box 2 to slide downward through the connecting rod 10. When the lower end of the rectangular box 2 is completely against the bottom plate 1, the driving motor 4 is turned off, and the supporting vertical plate 3 and the fluid detection equipment can be covered in the rectangular box 2. When it is necessary to maintain and detect faults of the fluid detection equipment in the rectangular box 2, the driving motor 4 is rotated forward again, and the reciprocating slider 9 at the lower end of the reciprocating screw 8 will start to slide upward, thereby driving the rectangular box 2 to slide upward, and the rectangular box 2 can be quickly separated from the fluid detection equipment, so that the staff can install and maintain the fluid detection equipment more conveniently.

[0040] Embodiment 3:

[0041] Reference Figure 4-Figure 6 , which is basically the same as Example 2, and further, a specific implementation scheme for dissipating heat for the fluid detection equipment in the rectangular box 2 is specifically added.

[0042] The supporting upright plate 3 is provided with symmetrically arranged air outlet holes 14 and air inlet holes 15, and the lower ends of the air inlet holes 15 and the air outlet holes 14 extend to the lower end of the bottom plate 1, wherein the air outlet holes 14 and the air inlet holes 15 are connected to each other through a plurality of heat dissipation holes 16, and the lower port of the air outlet hole 14 is provided with a negative pressure component for generating negative pressure, and the negative pressure component includes a rotating tube 17 rotatably connected to the lower port of the air outlet hole 14, and a fan blade 18 is fixedly installed on the inner wall of the rotating tube 17, wherein a ring gear 19 is fixedly installed on the outer wall of the rotating tube 17, and the driving gear 11 is meshedly connected with the ring gear 19, and a first filter screen 21 is installed at the lower port of the rotating tube 17, and a second filter screen 23 is installed at the lower port of the air inlet hole 15.

[0043] When the rectangular box 2 is installed to completely cover the upper end of the base plate 1, the driving motor 4 is reversed, and the active gear 11 will drive the driven gear 12 to reverse. Since the driven gear 12 is connected to the reciprocating screw 8 through the first one-way bearing 13, the reciprocating screw 8 will not reverse. At this time, the active gear 11 will also drive the ring gear 19 to rotate, and the ring gear 19 will drive the rotating tube 17 to rotate. The rotating tube 17 will allow the air inlet 15 to inhale external air, and the air will enter the air outlet 14 after passing through the heat dissipation hole 16, and then the rotating tube 17 at the lower end of the air outlet 14 will be discharged. When the air passes through the air outlet 14, the air inlet 15 and the heat dissipation hole 16, it will take away the heat on the supporting plate 3, and the supporting plate 3 will take away the temperature of the fluid detection equipment in the rectangular box 2, so that the fluid detection equipment can be well cooled to prevent the fluid detection equipment from being in a high temperature state for a long time and affecting the measurement accuracy. When the air enters the air inlet 15, the second filter 23 can filter the dust in the air.

[0044] Embodiment 4:

[0045] Reference Figure 2 , Figure 4 as well as Figure 6 , which is basically the same as Example 3, and further, a specific implementation plan for cleaning the second filter screen 23 is specifically added.

[0046] The lower end of the base plate 1 is slidably connected to a cleaning plate 24, the upper end of the cleaning plate 24 is provided with a cleaning brush 27 that cooperates with the second filter screen 23, and the lower end of the base plate 1 is provided with a push-pull mechanism that drives the cleaning brush 27 to move horizontally. The push-pull mechanism includes a sleeve 25 fixedly connected to the lower end of the base plate 1, and a piston rod 26 is slidably connected in the sleeve 25. The end of the piston rod 26 is fixedly connected to the cleaning plate 24, wherein a telescopic airbag 28 is fixedly installed between the guide rod 7 and the inner bottom of the guide hole 6, and the telescopic airbag 28 is fixedly connected and communicated with the sleeve 25 through a connecting tube 29.

[0047] When the rectangular box 2 moves downward, the rectangular box 2 will drive the guide rod 7 to slide downward in the guide hole 6, and the guide rod 7 will press the telescopic airbag 28. The telescopic airbag 28 will transport the internal air to the sleeve 25 through the connecting pipe 29. The piston rod 26 in the sleeve 25 will drive the cleaning plate 24 to slide over the lower end of the second filter screen 23 under the action of air pressure, and will eventually press on the left edge of the lower end of the second filter screen 23. The cleaning plate 24 will clean the lower end of the second filter screen 23 through the cleaning brush 27, and the automatic cleaning of the second filter screen 23 can be completed. When the guide rod 7 slides upward with the rectangular box 2, the telescopic airbag 28 will be stretched, and the cleaning plate 24 will slide in the opposite direction to reset, thereby cleaning the lower end of the second filter screen 23 again.

[0048] Embodiment 5:

[0049] Reference Figure 4-Figure 7 , which is basically the same as Example 4, and further, a specific implementation scheme for self-cleaning the air inlet 15, the air outlet 14 and the heat dissipation hole 16 is specifically added.

[0050] The lower port of the air inlet 15 is fixedly connected to the fixed shaft 22, and the second filter 23 is rotatably connected to the fixed shaft 22, and a torsion spring 30 is installed between the second filter 23 and the fixed shaft 22; when the driving motor 4 rotates forward to make the second rectangular box 2 slide upward and downward, the rotating tube 17 will also rotate synchronously, and will make the rotating tube 17 suck air into the air outlet 14, so that the lower port of the air inlet 15 is exhausted, so that the dust on the outer wall of the second filter 23 can be blown off in the reverse direction. At this time, in cooperation with the movable cleaning brush 27, the self-cleaning effect of the second filter 23 can be improved, and the first filter 21 can prevent dust from entering the air outlet 14 from the rotating tube 17.

[0051] Furthermore, an annular plate 31 that can move up and down is sleeved in the air inlet 15 and the air outlet 14, and a brush 32 is provided on the outer wall of the annular plate 31 to abut against the inner wall of the air inlet 15 and the air outlet 14. Two tie rods 33 extending into the air inlet 15 and the air outlet 14 are fixedly connected to the inner top of the rectangular box 2, and the two annular plates 31 are fixedly connected to the lower ends of the two tie rods 33 respectively;

[0052] When the cleaning brush 27 slides to the right end, the second filter 23 is no longer pressed by the cleaning brush 27, and the second filter 23 will rotate and tilt on the fixed shaft 22 under the action of the torsion spring 30. At this time, the exhaust resistance of the air inlet 15 is reduced, and the flowing air can also bring a small amount of dust entering the air outlet 14, the air inlet 15 and the heat dissipation hole 16 out of the air inlet 15, thereby ensuring the cleanliness of the inner walls of the air outlet 14, the air inlet 15 and the heat dissipation hole 16. When the cleaning brush 27 moves to the left, that is, after the rectangular box 2 slides downward, the cleaning brush 27 will flatten the second filter 23 and press the left end of the second filter 23, thereby completing the blocking of the air inlet 15, and the second filter 23 can continue to filter the dust entering the air inlet 15.

[0053] The fluid measuring box which is easy to install and maintain is used. When in use, the detection equipment for detecting the fluid is installed on the front and rear sides of the supporting vertical plate 3, and the external pipe body is connected through the circular hole 20. There is no obstruction on the front and rear sides of the supporting vertical plate 3, so the installation will be extremely convenient. Then, the driving motor 4 is rotated forward, and the driving motor 4 can drive the driven gear 12 to rotate through the driving gear 11, and the driven gear 12 can drive the reciprocating screw 8 to rotate, and the reciprocating screw 8 can drive the reciprocating slider 9 to slide downward, and the reciprocating slider 9 can drive the rectangular box 2 to slide downward through the connecting rod 10. When the lower end of the rectangular box 2 is completely against the bottom plate 1, the driving motor 4 is turned off, and the supporting vertical plate 3 and the fluid detection equipment can be covered in the rectangular box 2. When it is necessary to maintain and detect faults of the fluid detection equipment in the rectangular box 2, the driving motor 4 is rotated forward again, and the reciprocating slider 9 located at the lower end of the reciprocating screw 8 will start to slide upward, thereby driving the rectangular box 2 to slide upward, and the rectangular box 2 can be quickly separated from the fluid detection equipment, so that the staff can install and maintain the fluid detection equipment more conveniently.

[0054] When the rectangular box 2 is installed to completely cover the upper end of the base plate 1, the driving motor 4 is reversed, and the active gear 11 will drive the driven gear 12 to reverse. Since the driven gear 12 is connected to the reciprocating screw 8 through the first one-way bearing 13, the reciprocating screw 8 will not reverse. At this time, the active gear 11 will also drive the ring gear 19 to rotate, and the ring gear 19 will drive the rotating tube 17 to rotate. The rotating tube 17 will allow the air inlet 15 to inhale external air, and the air will enter the air outlet 14 after passing through the heat dissipation holes 16, and then the rotating tube 17 at the lower end of the air outlet 14 will be discharged. When the air passes through the air outlet 14, the air inlet 15 and the heat dissipation holes 16, it will take away the heat on the supporting plate 3, and the supporting plate 3 will take away the temperature of the fluid detection equipment in the rectangular box 2, so that the fluid detection equipment can be well cooled to prevent the fluid detection equipment from being in a high temperature state for a long time and affecting the measurement accuracy.

[0055] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A fluid measuring box that is easy to install and maintain, comprising a base plate (1), characterized in that: Also includes: A rectangular box (2) with a downward opening is arranged at the upper end of the bottom plate (1). The middle part of the bottom plate (1) is fixedly connected to a supporting upright plate (3), the supporting upright plate (3) is located in the rectangular box (2), and a lifting mechanism for driving the rectangular box (2) to move up and down is provided on the bottom plate (1); A rectangular sealing plate (35) is fixedly connected to the upper end of the bottom plate (1) and cooperates with the inner wall of the lower port of the rectangular box (2). Wherein, a plurality of circular holes (20) are provided at the lower end of the bottom plate (1); The lifting mechanism comprises: a driving motor (4) fixedly mounted on the lower end of the base plate (1); a mounting hole (5) and a guide hole (6) facing upward are respectively provided on both sides of the upper end of the supporting upright plate (3); A reciprocating screw (8) is rotatably connected in the device hole (5), a reciprocating slider (9) is threadedly connected to the outer wall of the device hole (5) and is slidably connected to the inner wall of the device hole (5), a guide rod (7) is slidably connected in the guide hole (6) and is fixedly connected to the inner top of the rectangular box (2), and the reciprocating slider (9) is fixedly connected to the inner top of the rectangular box (2) via a connecting rod (10); A driving gear (11) is fixedly mounted on the output shaft of the driving motor (4), and a driven gear (12) is mounted on the lower end of the reciprocating screw (8) via a one-way bearing (13); The supporting upright plate (3) is provided with symmetrically arranged air outlet holes (14) and air inlet holes (15), and the lower ends of the air inlet holes (15) and the air outlet holes (14) extend to the lower end of the bottom plate (1). The air outlet (14) and the air inlet (15) are connected via a plurality of heat dissipation holes (16), and a negative pressure component for generating negative pressure is provided at the lower end of the air outlet (14); The negative pressure component comprises: The rotating tube (17) connected to the lower end of the air outlet (14) is rotated, and the inner wall of the rotating tube (17) is fixedly mounted with a fan blade (18). A ring gear (19) is fixedly mounted on the outer wall of the rotating tube (17), the driving gear (11) is meshingly connected with the ring gear (19), a first filter screen (21) is mounted on the lower end of the rotating tube (17), and a second filter screen (23) is mounted on the lower end of the air inlet hole (15); The lower end of the bottom plate (1) is slidably connected to a cleaning plate (24), the upper end of the cleaning plate (24) is provided with a cleaning brush (27) that cooperates with the second filter screen (23), and the lower end of the bottom plate (1) is provided with a push-pull mechanism that drives the cleaning brush (27) to move horizontally.

2. A fluid measuring box that is easy to install and maintain according to claim 1, characterized in that: The push-pull mechanism comprises: A sleeve (25) is fixedly connected to the lower end of the bottom plate (1), a piston rod (26) is slidably connected in the sleeve (25), and the end of the piston rod (26) is fixedly connected to the cleaning plate (24). A telescopic airbag (28) is fixedly mounted between the guide rod (7) and the inner bottom of the guide hole (6), and the telescopic airbag (28) is fixedly connected and communicated with the sleeve (25) via a connecting tube (29).

3. A fluid measuring box that is easy to install and maintain according to claim 1, characterized in that: The lower end of the air inlet (15) is fixedly connected to a fixed shaft (22), the second filter screen (23) is rotatably connected to the fixed shaft (22), and a torsion spring (30) is installed between the second filter screen (23) and the fixed shaft (22).

4. A fluid measuring box that is easy to install and maintain according to claim 3, characterized in that: The air inlet (15) and the air outlet (14) are both sleeved with an annular plate (31) that can move up and down, and the outer wall of the annular plate (31) is provided with a brush (32) that abuts against the inner walls of the air inlet (15) and the air outlet (14).

5. A fluid measuring box that is easy to install and maintain according to claim 4, characterized in that: Two tie rods (33) extending into the air inlet (15) and the air outlet (14) are fixedly connected to the inner top of the rectangular box (2), and the two annular plates (31) are respectively fixedly connected to the lower ends of the two tie rods (33).

6. A fluid measuring box that is easy to install and maintain according to claim 1, characterized in that: A top plate (34) is fixedly connected to the top of the rectangular box (2), and a transparent observation window is also provided on the front face of the rectangular box (2).

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