Air compressor air inlet device capable of replacing filter screen on line

Abstract

The utility model relates to an air compressor air inlet device capable of replacing a filter screen on line. An air inlet and an air outlet are formed in an air inlet pipeline; the filter screen assembly comprises a filter screen frame and a first air inlet filter screen detachably installed on the filter screen frame. The bypass pipeline is connected to the two ends of the filter screen assembly of the air inlet pipeline, first electric control valves are arranged at the joints of the bypass pipeline and the air inlet pipeline, a second air inlet filter screen is installed in the bypass pipeline, and second electric control valves are further arranged at the joints of the air inlet pipeline and the two ends of the bypass pipeline. The monitoring device is used for monitoring gas pressure or flow before and after the filter screen assembly in the gas inlet pipeline in real time; the control system comprises a microprocessor, a storage unit and a communication unit, the microprocessor receives signals of the monitoring device and processes the signals according to a preset program in the storage unit, and the communication unit is in signal connection with the first electric control valve and the second electric control valve. The online replacement of the air inlet filter screen of the air compressor is realized, and the use requirements of industries with high continuous requirements in the production process are met.

Description

Technical Field

[0001] The present application relates to the technical field of air compressors, and in particular to an air compressor air intake device with an online replaceable filter screen. Background Art

[0002] An air compressor is a device used to compress gas. It can be reciprocating piston, rotary vane, or rotary screw. Screw compressors are a type of air compressor. However, existing screw compressors have some shortcomings. They fail to filter and purify the air before extracting and compressing it, failing to improve the quality of the compressed air. This can lead to damage to the equipment caused by impurities, acidic and alkaline substances, and large particles in the air, resulting in defects.

[0003] Chinese patent CN220890449U discloses an air compressor intake connection structure, including an air compressor intake pipe, a limit frame, an outer frame, screws and a latch, wherein the air compressor intake pipe is provided with a first mounting hole, the outer portion of the limit frame is fixedly connected to a mounting plate, the mounting plate is provided with a second mounting hole, the outer frame can be plugged into the interior of the limit frame, the front side of the outer frame is fixedly connected to a positioning plate, the positioning plate is provided with a second positioning hole, the air compressor intake pipe is provided with a first positioning hole, and the latch can be plugged into the interior of the first positioning hole and the second positioning hole. The air compressor intake connection structure inserts the latch into the second positioning hole on the positioning plate and the first positioning hole on the air compressor intake pipe, and causes the first magnetic block and the second magnetic block to be magnetically attracted to each other, allowing the outer frame and the filter body to be quickly installed, and the outer frame and the filter body to be quickly disassembled by pulling out the latch, facilitating quick replacement of the filter.

[0004] In the existing patent, a filter that can be quickly removed is installed in the air intake connection structure of the air compressor. After long-term use or accumulation of a large amount of impurities on the filter, the air intake effect will be affected. Currently, the filter can only be replaced by regular shutdown, which cannot meet the use requirements of various environments. When working in a space with a lot of impurities, the ventilation condition of the filter cannot be discovered in time and the filter needs to be shut down when replacing the filter. It cannot meet the use needs of industries with high requirements for continuity in the production process. Utility Model Content

[0005] In order to overcome the problems existing in the prior art, the present application provides an air compressor air intake device with an online replaceable filter.

[0006] The present application provides an air compressor air intake device with an online filter replacement screen, which adopts the following technical solutions:

[0007] 1. The ventilator of claim 1 , wherein the ventilator is configured to vent the compressed air from the air intake duct to the compressor body, wherein the ventilator is configured to vent the compressed air from the air intake duct to the compressor body. The ventilator is configured to vent the compressed air from the air intake duct to the compressor body, wherein the ventilator is configured to vent the compressed air from the air intake duct to the compressor body. The ventilator is configured to vent the compressed air from the air intake duct to the compressor body, wherein the ventilator is configured to vent the compressed air from the air intake duct to the compressor body.

[0008] By adopting the above technical solution, the air intake duct introduces external air into the air compressor body, wherein the air inlet and the air outlet are connected to the outside and the air compressor inlet respectively. The filter assembly located on the air intake duct can filter out impurities in the air, thereby preventing the air containing impurities from affecting the air compressor body. The filter assembly on both sides of the air intake duct is connected to the two ends of the bypass duct respectively, and the bypass duct end at the connection is provided with a first electrically controlled valve, and the end of the air intake duct contacting the bypass duct is provided with a second electrically controlled valve. In addition, the monitoring device provided before and after the filter assembly cooperates with the control system installed on the air intake duct. When the monitoring device detects that the difference in gas pressure or flow before and after the filter assembly is too large and reaches a set value, the communication unit of the control system transmits a signal to the first electrically controlled valve and the second electrically controlled valve. At this time, the first electrically controlled valve is opened and the second electrically controlled valve is closed. The position of the filter assembly is sealed, and the air is filtered through the second air intake filter in the bypass duct and enters the air compressor. At this time, the first air intake filter on the filter assembly can be replaced. After the replacement is completed, the operator manually operates the control system or automatically opens the second electronically controlled valve and closes the first electronically controlled valve according to the time set in the storage unit in the control system to restore normal air intake.

[0009] Preferably, the filter frame in the filter assembly is detachably connected to the first air intake filter, wherein the filter frame includes a mounting frame fixedly connected to the air intake pipe and a mounting frame sealed to the mounting frame, wherein the first air intake filter is installed in the mounting frame, and a sealing structure is provided between the mounting frame and the mounting frame.

[0010] A clamping block is installed at the bottom of the mounting frame, and a clamping groove for fixing the clamping block is installed on the mounting frame. The clamping groove adopts a spherical structure, and the spherical structure includes two sets of hemispherical structures that are rotatably connected at the bottom. An opening with a diameter smaller than the inner diameter of the spherical structure is provided at the top of the clamping groove, and an outward-inclined guide plate is provided on the opening.

[0011] An elastic piece is installed on the outer side of the hemispherical structure, and the outer diameter of the clamping block is the same as the inner diameter of the clamping groove.

[0012] A quick locking mechanism is installed on the top of the filter assembly, including a locking assembly located on the mounting frame and a locking hole on the top of the mounting frame. The locking assembly unlocks and unlocks the locking rod and the locking hole by driving the adjusting knob thereon. The adjusting knob is located in the groove body at the top of the mounting frame, and the locking rod is slidably installed in the through-holes around the groove body. The adjusting knob is annularly distributed with locking grooves and unlocking grooves, and a transition slope is provided between the locking groove and the unlocking groove.

[0013] The locking rod is provided with a buffer spring located inside the buffer hole, and a support ring is distributed in an annular manner on the locking rod to abut against the inner side of the buffer spring. The other end of the buffer spring abuts against the end of the buffer hole inside the through hole. The buffer spring and the support ring are both located in the buffer hole.

[0014] By adopting the above technical solution, the filter frame in the filter assembly is detachably connected to the first air intake filter, wherein the mounting frame in the filter frame is fixedly connected to the air intake pipe body, and the first air intake filter is fixedly installed in the mounting frame. When replacing the first air intake filter, it is only necessary to remove the mounting frame from the mounting frame for replacement to achieve the replacement of the first air intake filter, and a sealing structure is provided between the mounting frame and the mounting frame. The sealing structure adopts an annular sealing ring provided on both sides of the mounting frame and the contact surface of the mounting frame to ensure the sealing of the filter assembly. When the bottom of the mounting frame is connected to the mounting frame, the clamping block installed at the bottom is introduced along the guide plate at the top of the clamping groove. The clamping block squeezes the hemispherical structures on both sides and compresses the elastic member on the outside of the hemispherical structure. When the clamping block completely enters the clamping groove of the spherical structure, the elastic member resets, confining the clamping block within the clamping groove, thereby achieving the fixation of the bottom of the mounting frame and the mounting frame. After the bottom is fixed, the quick locking mechanism on the top of the filter assembly is operated to guide the locking rod abutting on the adjustment knob from the unlocking groove along the transition slope into the locking groove. The locking rod slides outward along the perforation to the locking hole inside the mounting bracket. The support ring on the locking rod compresses the spring located in the buffer hole, thereby achieving the fixation of the mounting frame and the mounting bracket by the quick locking mechanism. When removing the first air intake filter, the adjustment knob is turned to move the position abutting against the locking rod from the locking groove to the unlocking groove. At this time, the spring in the buffer hole acts on the support ring on the locking rod, guiding the locking rod out of the locking hole in the mounting bracket to complete the unlocking. Then, the mounting frame with the bottom clamping block clamped in the clamping groove is lifted upward. The clamping block squeezes the hemispherical mechanisms on both sides of the clamping groove, thereby achieving the unlocking of the mounting frame on the mounting bracket.

[0015] Preferably, the monitoring device is a pressure sensor or a flow sensor, wherein the monitoring device is arranged in the air intake duct near the front and rear sides of the filter assembly.

[0016] By adopting the above technical solution, the monitoring device monitors the data on the front and rear sides of the filter assembly through pressure sensors and flow sensors. When the data difference becomes larger and larger, it means that more and more impurities on the first air intake filter affect the air circulation. According to the value set by the control system, when the difference is reached, the filter frame is replaced.

[0017] Preferably, an observation window is installed on the side of the filter assembly, and the observation window is opened on the side located in front and behind the filter assembly.

[0018] By adopting the above technical solution, the observation window can intuitively observe the situation inside the air intake duct, which is convenient for timely and accurate understanding of the installation and working conditions of the filter assembly.

[0019] In summary, this application includes at least one of the following beneficial technical effects:

[0020] 1. This application installs a bypass pipe next to the air intake pipe. When the filter in the filter assembly needs to be replaced, air can be introduced into the air compressor through the bypass pipe, easily realizing the online replacement of the air compressor intake filter, meeting the needs of industries with high requirements for continuous production processes;

[0021] 2. This application provides a quick locking mechanism in the filter assembly, which pre-fixes the filter in the installation frame and can be installed and removed from the installation frame on the air intake pipe, thereby achieving rapid replacement of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of an air compressor intake device with an online replaceable filter;

[0023] Figure 2 yes Figure 1 An enlarged view of the upper structure of the quick locking mechanism;

[0024] Figure 3 yes Figure 1 An enlarged view of the lower structure of the quick locking mechanism;

[0025] Figure 4 This is a three-dimensional structural view of the upper structure of the quick locking mechanism in the air intake device of an air compressor with online filter replacement;

[0026] Figure 5 The present invention is a schematic diagram of the structure of a quick locking mechanism installed on the top of a frame in an air intake device of an air compressor with an online replaceable filter.

[0027] Explanation of reference numerals: 1. Inlet pipe; 11. Inlet port; 12. Outlet port; 13. Second electrically controlled valve; 2. Filter assembly; 21. Filter frame; 22. First inlet filter; 23. Quick locking mechanism; 24. Observation window; 3. Bypass pipe; 31. First electrically controlled valve; 32. Second inlet filter; 4. Monitoring device; 5. Control system; 6. Mounting frame; 61. Snap-fit groove; 611. Hemispherical structure Structure; 6111, elastic member; 612, opening; 613, guide plate; 62, locking hole; 7, mounting frame; 71, snap-in block; 72, locking assembly; 721, adjusting knob; 73, slot body; 731, through-hole; 7311, buffer hole; 732, locking slot; 733, unlocking slot; 734, transition slope; 74, locking rod; 741, buffer spring; 742, support ring; 8, sealing structure. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-5 This application is described in further detail.

[0029] An embodiment of the present application discloses an air compressor air intake device with an online replaceable filter.

[0030] Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 , an air compressor intake device with an online replaceable filter, comprising an intake pipe 1, the intake pipe 1 is used to transport the air to be compressed into the air compressor body, and an air inlet 11 and an air outlet 12 are provided on the intake pipe 1; a filter assembly 2, the filter assembly 2 is installed on the intake pipe 1, and comprises a filter frame 21 and a first intake filter 22 detachably mounted on the filter frame 21, wherein the first intake filter 22 and the filter frame 21 are sealed; a bypass pipe 3, the bypass pipe 3 is connected to both ends of the filter assembly 2 of the intake pipe 1, and the connection between the bypass pipe 3 and the intake pipe 1 has a first An electrically controlled valve 31 is provided, and a second air intake filter 32 is installed in the bypass pipe 3. A second electrically controlled valve 13 for sealing the two ends of the filter assembly 2 is also provided at the connection between the air intake pipe 1 and the bypass pipe 3. A monitoring device 4 is provided, and the monitoring device 4 is used to monitor the gas pressure or flow before and after the filter assembly 2 in the air intake pipe 1 in real time. A control system 5 is provided, and the control system 5 includes a microprocessor, a storage unit, and a communication unit, wherein the microprocessor receives the signal from the monitoring device 4 and processes it according to a preset program in the storage unit, and the communication unit is connected to the first electrically controlled valve 31 and the second electrically controlled valve 13. The air intake pipe 1 introduces the outside air into the air compressor body, wherein the air inlet 11 and the air outlet 12 are connected to the outside and the air compressor air inlet 11 respectively. The filter assembly 2 located on the air intake pipe 1 can filter out impurities in the air, thereby preventing the air containing impurities from affecting the air compressor body. The two sides of the filter assembly 2 of the intake duct 1 are connected to the two ends of the bypass duct 3. A first electrically controlled valve 31 is installed at the end of the bypass duct 3 at the connection point. A second electrically controlled valve 13 is installed at the end of the intake duct 1 where it contacts the bypass duct 3. Monitoring devices 4, located before and after the filter assembly 2, cooperate with a control system 5 installed on the intake duct 1. When the monitoring device 4 detects that the difference in gas pressure or flow before and after the filter assembly 2 is too large and reaches a set value, the communication unit of the control system 5 transmits a signal to the first electrically controlled valve 31 and the second electrically controlled valve 13, opening the first electrically controlled valve 31 and closing the second electrically controlled valve 13. The filter assembly 2 is then sealed, and air is filtered through the second intake filter 32 in the bypass duct 3 before entering the air compressor. At this time, the first intake filter 22 of the filter assembly 2 can be replaced. After replacement, the operator manually operates the control system 5 or automatically opens the second electrically controlled valve 13 and closes the first electrically controlled valve 31 according to a time set in a storage unit of the control system 5, restoring normal air intake.

[0031] Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5The filter frame 21 in the filter assembly 2 is detachably connected to the first air intake filter 22, wherein the filter frame 21 includes a mounting bracket 6 fixedly connected to the air intake duct 1 and a mounting frame 7 sealed to the mounting bracket 6, wherein the first air intake filter 22 is mounted in the mounting frame 7, and a sealing structure 8 is provided between the mounting bracket 6 and the mounting frame 7. A clamping block 71 is mounted at the bottom of the mounting frame 7, and a clamping groove 61 for fixing the clamping block 71 is mounted on the mounting bracket 6. The clamping groove 61 adopts a spherical structure, and the spherical structure includes two groups of hemispherical structures 611 that are rotatably connected at the bottom. The top of the clamping groove 61 is provided with an opening 612 with a diameter smaller than the inner diameter of the spherical structure, and the opening 612 is provided with an outwardly inclined guide plate 613. An elastic member 6111 is mounted on the outside of the hemispherical structure 611, and the outer diameter of the clamping block 71 is the same as the inner diameter of the clamping groove 61. A quick locking mechanism 23 is installed on the top of the filter assembly 2, including a locking assembly 72 located on the mounting frame 7 and a locking hole 62 on the top of the mounting frame 6, wherein the locking assembly 72 realizes the unlocking and unlocking of the locking rod 74 and the locking hole 62 by driving the adjusting knob 721 thereon, and the adjusting knob 721 is located in the groove body 73 at the top of the mounting frame 7, and the locking rod 74 is slidably installed in the through-hole 731 around the groove body 73, and the adjusting knob 721 is annularly distributed with locking grooves 732 and unlocking grooves 733, and a transition slope 734 is provided between the locking groove 732 and the unlocking groove 733. A buffer spring 741 is mounted on the locking rod 74 and positioned inside the buffer hole 7311. A support ring 742 is annularly arranged on the locking rod 74, abutting the inside of the buffer spring 741. The other end of the buffer spring 741 abuts the end of the buffer hole 7311 inside the through-hole 731, and both the buffer spring 741 and the support ring 742 are positioned within the buffer hole 7311. The filter frame 21 in the filter assembly 2 is detachably connected to the first air intake filter 22. The mounting bracket 6 in the filter frame 21 is fixedly connected to the intake pipe body, and the first air intake filter 22 is fixedly mounted within the mounting frame 7. To replace the first air intake filter 22, simply remove the mounting bracket 7 from the mounting bracket 6. A sealing structure 8 is provided between the mounting bracket 6 and the mounting frame 7. The sealing structure 8 utilizes an annular sealing ring disposed on both sides of the mounting bracket 7, contacting the mounting bracket 6, to ensure the sealing of the filter assembly 2. When the bottom of the mounting frame 7 is connected to the mounting bracket 6, the clamping block 71 installed at the bottom is introduced along the guide plate 613 at the top of the clamping groove 61. The clamping block 71 squeezes the hemispherical structures 611 on both sides and compresses the elastic member 6111 on the outside of the hemispherical structure 611. When the clamping block 71 completely enters the clamping groove 61 of the spherical structure, the elastic member 6111 resets and restricts the clamping block 71 in the clamping groove 61, thereby achieving the fixation of the bottom of the mounting frame 7 and the mounting bracket 6.After the bottom is fixed, by operating the quick locking mechanism 23 on the top of the filter assembly 2, the locking rod 74 abutting the adjusting knob 721 is introduced from the unlocking groove 733 along the transition slope 734 into the locking groove 732, and the locking rod 74 slides outward along the through-hole 731 to the locking hole 62 on the inner side of the mounting bracket 6. The support ring 742 on the locking rod 74 compresses the spring located in the buffer hole 7311, thereby realizing the fixation between the mounting frame 7 and the mounting bracket 6 by the quick locking mechanism 23. When disassembling the first air intake filter 22, turn the adjusting knob 721 to move the position abutting the locking rod 74 from the locking groove to the unlocking groove 733. At this time, the spring in the buffer hole 7311 acts on the support ring 742 on the locking rod 74, and guides the locking rod 74 out of the locking hole 62 in the mounting bracket 6 to complete the unlocking. Then, the mounting frame 7 in the mounting groove 61 with the bottom clamping block 71 clamped therein is lifted upward, and the clamping block 71 squeezes the hemispherical mechanism on both sides of the clamping groove 61 to unlock the mounting frame on the mounting bracket 6.

[0032] Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 Monitoring device 4 employs a pressure sensor or a flow sensor and is positioned within intake duct 1 near the front and rear sides of filter assembly 2. Monitoring device 4 uses the pressure and flow sensors to monitor data from both sides of filter assembly 2. A growing difference in the data indicates that impurities on first intake filter 22 are increasing, impacting air circulation. When the difference reaches a certain value, control system 5 determines that filter frame 21 is replaced.

[0033] Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 , an observation window 24 is installed on the side of the filter assembly 2, and the observation window 24 is opened on the side of the filter assembly 2. The observation window 24 can intuitively observe the situation inside the air intake pipe 1, which is convenient for timely and accurate understanding of the installation and working conditions of the filter assembly 2.

[0034] Working principle: When the air compressor is working, the air outlet 12 of the air intake pipe 1 is connected to the air intake 11 of the air compressor. The filter assembly 2 located on the air intake pipe 1 can filter out impurities in the air. When the monitoring device 4 before and after the filter assembly 2 detects that the difference in flow before and after the filter assembly 2 is too large and reaches a set value, the communication unit of the control system 5 transmits a signal to the first electrically controlled valve 31 and the second electrically controlled valve 13. At this time, the first electrically controlled valve 31 is opened and the second electrically controlled valve 13 is closed. The position of the filter assembly 2 is sealed, and the air is filtered through the second air intake filter 32 in the bypass pipe 3 and enters the air compressor. At this time, the first air intake filter 22 on the filter assembly 2 can be replaced. After the replacement is completed, the operator manually operates the control system 5 or the second electrically controlled valve 13 is automatically opened and the first electrically controlled valve 31 is closed according to the time set in the storage unit of the control system 5 to restore normal air intake.

[0035] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An air compressor air intake device with online filter replacement, characterized by: include An air intake pipe (1), the air intake pipe (1) is used to transport air to be compressed into the air compressor body, and the air intake pipe (1) is provided with an air inlet (11) and an air outlet (12); A filter assembly (2), the filter assembly (2) being mounted on the air intake duct (1), comprising a filter frame (21) and a first air intake filter (22) detachably mounted on the filter frame (21), wherein the first air intake filter (22) and the filter frame (21) are sealed together; A bypass pipe (3), the bypass pipe (3) being connected to both ends of the filter assembly (2) of the intake pipe (1), a first electrically controlled valve (31) being provided at the connection between the bypass pipe (3) and the intake pipe (1), a second intake filter (32) being installed in the bypass pipe (3), and a second electrically controlled valve (13) for sealing both ends of the filter assembly (2) being provided at the connection between the intake pipe (1) and the bypass pipe (3); A monitoring device (4), the monitoring device (4) is used to monitor the gas pressure or flow before and after the filter assembly (2) in the intake pipe (1) in real time; A control system (5), the control system (5) comprising a microprocessor, a storage unit and a communication unit, wherein the microprocessor receives a signal from the monitoring device (4) and processes the signal according to a program preset in the storage unit, and the communication unit is connected to the first electrically controlled valve (31) and the second electrically controlled valve (13) via signals.

2. The air compressor air intake device with online filter replacement according to claim 1, characterized in that: The filter frame (21) in the filter assembly (2) is detachably connected to the first air intake filter (22), wherein the filter frame (21) comprises a mounting frame (6) fixedly connected to the air intake duct (1) and a mounting frame (7) sealed to the mounting frame (6), wherein the first air intake filter (22) is mounted in the mounting frame (7), and a sealing structure (8) is provided between the mounting frame (6) and the mounting frame (7).

3. The air compressor air intake device with online filter replacement according to claim 2, characterized in that: A clamping block (71) is installed at the bottom of the mounting frame (7), and a clamping groove (61) for fixing the clamping block (71) is installed on the mounting frame (6). The clamping groove (61) adopts a spherical structure, and the spherical structure includes two groups of hemispherical structures (611) that are rotatably connected at the bottom. The top of the clamping groove (61) is provided with an opening (612) whose diameter is smaller than the inner diameter of the spherical structure, and the opening (612) is provided with a guide plate (613) inclined outward.

4. The air compressor air intake device with online filter replacement according to claim 3, characterized in that: An elastic member (6111) is installed on the outside of the hemispherical structure (611), and the outer diameter of the clamping block (71) is the same as the inner diameter of the clamping groove (61).

5. The air compressor air intake device with online filter replacement according to claim 4, characterized in that: A quick locking mechanism (23) is installed on the top of the filter assembly (2), comprising a locking assembly (72) located on the mounting frame (7) and a locking hole (62) at the top of the mounting frame (6), wherein the locking assembly (72) realizes unlocking and unlocking of the locking rod (74) and the locking hole (62) by driving an adjusting knob (721) thereon, wherein the adjusting knob (721) is located in a groove (73) at the top of the mounting frame (7), and the locking rod (74) is slidably installed in a through-hole (731) around the groove (73), and a locking groove (732) and an unlocking groove (733) are annularly distributed on the adjusting knob (721), and a transition slope (734) is provided between the locking groove (732) and the unlocking groove (733).

6. The air compressor air intake device with online filter replacement according to claim 5, characterized in that: The locking rod (74) is provided with a buffer spring (741) located inside the buffer hole (7311), and a support ring (742) is distributed in an annular shape on the locking rod (74) and abuts against the inside of the buffer spring (741). The other end of the buffer spring (741) abuts against the end of the buffer hole (7311) inside the through hole (731). The buffer spring (741) and the support ring (742) are both located in the buffer hole (7311).

7. The air compressor air intake device with online filter replacement according to claim 1, characterized in that: The monitoring device (4) adopts a pressure sensor or a flow sensor, wherein the monitoring device (4) is arranged in the air intake pipe (1) near the front and rear sides of the filter assembly (2).

8. The air compressor air intake device with online filter replacement according to claim 7, characterized in that: An observation window (24) is installed on the side of the filter assembly (2), and the observation window (24) is opened on the side surfaces located in front and behind the filter assembly (2).

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