Pneumatic pipeline garbage power system with dust removal and deodorization functions

Abstract

The utility model relates to the technical field of pneumatic type pipelines, in particular to a pneumatic type pipeline garbage power system with dedusting and deodorizing functions, which comprises a power mechanism and an air filtering mechanism, fan filtering components are fixedly mounted at the upper ends of three groups of power fans, fan control cabinets are correspondingly mounted on the outer sides of the power fans, and the fan control cabinets are connected with the air filtering mechanism. The upper end of the fan filtering assembly is fixedly connected with a pi-shaped pipe fitting, a check valve assembly is fixedly installed in the center of the pi-shaped pipe fitting, the ends of the two sides of the pi-shaped pipe fitting are fixedly connected with air pipelines, and silencer assemblies are arranged at the connecting positions of the air pipelines and the pi-shaped pipe fitting. And the other end of the air pipeline at the left end is fixedly connected with an air filtering mechanism. The power mechanism is arranged, a high-speed and stable fan power system is provided, and the problems that a traditional pneumatic system is insufficient in suction power, equipment and pipelines are not reasonably sealed and connected, and noise of a machine room is large are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic pipelines, in particular to a pneumatic pipeline garbage power system with dust removal and deodorization functions. Background Art

[0002] In the traditional garbage collection method, users usually put garbage into centralized collection points, which are then transported to processing plants by manpower for multiple times. In many links of the process, the odor of garbage is easy to spread, and the processing capacity of the manual collection method is small. Some conventional pipeline garbage collection methods on the market, such as gravity-based methods, deliver garbage through vertical pipelines, which also involve many safety hazards, and the odor is easily exposed during the collection process.

[0003] Conventional pipeline garbage collection is usually equipped with fan equipment and individual installation accessories. On the one hand, it lacks anti-backflow and filter screen components, and is not well connected with the pipelines in the machine room, which can easily cause airflow turbulence and low fan efficiency. On the other hand, there is a lack of noise reduction measures, and the high-speed suction force of high-power fans brings a great noise impact. Finally, there is a lack of effective air treatment measures, and large particles of dust and odors in the airflow cannot be effectively treated, and secondary environmental problems are prominent. For this reason, we proposed a pneumatic pipeline garbage power system with dust removal and deodorization functions to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a pneumatic pipeline garbage power system with dust removal and deodorization functions to solve the problems of turbulent air flow, low fan efficiency, high-speed suction force of high-power fans causing great noise impact, and inability to effectively deal with large particles of dust and odor in the air flow proposed in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pneumatic pipeline garbage power system with dust removal and deodorization functions, including a power mechanism and an air filtering mechanism, the power mechanism including a power fan, a fan control cabinet, a fan filter assembly, a "π"-shaped pipe fitting, a check valve assembly, a muffler assembly and an air duct, the upper ends of the three groups of power fans are fixedly installed with fan filter assemblies, the outer sides of the power fans are correspondingly installed with fan control cabinets, the upper ends of the fan filter assemblies are fixedly connected with "π"-shaped pipe fittings, the center of the "π"-shaped pipe fittings is fixedly installed with a check valve assembly, the two side ends of the "π"-shaped pipe fittings are fixedly connected with air ducts, the connection between the air duct and the "π"-shaped pipe fitting is provided with a muffler assembly, the other end of the air duct at the left end is fixedly connected with the air filtering mechanism,

[0006] The air filtering mechanism includes a protection box, a filter assembly and an auxiliary assembly. The lower end of the air duct on the left end is fixedly connected to the protection box, the filter assembly is arranged inside the protection box, the top of the protection box is arranged with an auxiliary assembly, the left side of the protection box is fixedly connected to the exhaust duct, the outer side of the protection box is fixedly installed with a special protection door, and a handle is movably connected inside the special protection door.

[0007] Preferably, the filtering assembly includes a dust removal chamber, a primary filter, a secondary filter, a deodorization chamber, a drawer-type deodorization granular carbon box and an exhaust chamber. The primary filter is fixedly installed in the protective box, the secondary filter is fixedly connected to the left side of the primary filter, and a drawer-type deodorization granular carbon box is fixedly installed on the left side of the secondary filter in the protective box. The primary filter and the drawer-type deodorization granular carbon box separate the protective box from right to left into a dust removal chamber, a deodorization chamber and an exhaust chamber respectively.

[0008] Preferably, the auxiliary components include channel steel reinforcement ribs, inner pipe interfaces, outer pipe interfaces, trachea interfaces, explosion-proof lighting lamps and ultraviolet lamps; four groups of channel steel reinforcement ribs are fixedly installed at the four corners of the bottom of the protective box; the top of the protective box is fixedly connected to the inner pipe interface; the top left of the protective box is fixedly connected to the outer pipe interface; the upper surface of the protective box is fixedly installed with a trachea interface between the inner pipe interface and the outer pipe interface; explosion-proof lighting lamps are fixedly installed at equal distances on the top of the inner wall of the protective box; an ultraviolet lamp is fixedly installed on the outside of the explosion-proof lighting lamp in the protective box; the explosion-proof lighting lamp and the ultraviolet lamp are staggered with the inner pipe interface and the outer pipe interface.

[0009] Preferably, the check valve assembly includes an indicator arrow, a flange connecting plate, a valve disc fixing part and a compressed air inlet, the inner side of the "π"-shaped pipe fitting is connected to the check valve assembly via a flange connecting plate, an indicator arrow is provided on the outer surface of the check valve assembly, a valve disc fixing part is fixedly connected to the outer side of the check valve assembly on the right side of the indicator arrow, and a compressed air inlet is fixedly connected to the top of the check valve assembly.

[0010] Preferably, the muffler assembly includes a honeycomb channel, a glass rock wool sound-absorbing filler and an outer shell, the honeycomb channels are equidistantly arranged in the muffler assembly, the outer side of the muffler assembly is fixedly connected to the outer shell, and the outer side of the honeycomb channel is fixedly installed with a glass rock wool sound-absorbing filler in the outer shell.

[0011] Preferably, the fan filter assembly includes a pull-out fixed connecting piece and a screen, the pull-out fixed connecting piece is fixedly installed on the outside of the fan filter assembly, the screen is fixedly connected inside the fan filter assembly, a sealing rubber ring is fixedly connected to the top of the fan filter assembly, the other end of the sealing rubber ring is fixedly connected to a "π"-shaped pipe fitting, and the bottom inner side of the fan filter assembly is fixedly connected to a vertical pipe.

[0012] Preferably, a fixed pressure strip is fixedly connected to the outer side of the primary filter, the primary filters are fixedly connected via a movable pressing plate, U-shaped grooves are equidistantly fixedly connected inside the drawer-type deodorizing granular carbon box, and sealing plates are fixedly installed between the U-shaped grooves.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The utility model provides a high-speed and stable fan power system, frequency conversion control, series bypass arrangement of the unit, effective connection with the front and rear end pipelines, and pipeline silencers at both ends for noise reduction, so as to solve the problems of insufficient suction power of the traditional pneumatic system, unreasonable sealing connection between equipment and pipelines, and high noise in the machine room.

[0015] 2. The utility model is equipped with an air filtering mechanism. In view of the characteristics of daily garbage such as high dust particles, easy odor and volatility, it cooperates with a new pneumatic pipeline collection system and equipment to provide two-stage multi-group dust removal sections and multiple deodorizing and adsorbing activated carbon boxes to reduce the secondary environmental pollution problem after centralized garbage collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 It is a schematic top view of the structure of the utility model;

[0019] Figure 3 This is a structural schematic diagram of the air filtering mechanism of the utility model;

[0020] Figure 4 It is a front view schematic diagram of the structure of the primary filter of the utility model;

[0021] Figure 5This is a front view of the structure of the drawer-type deodorizing particle carbon box of the utility model;

[0022] Figure 6 This is a structural schematic diagram of the fan filter assembly of the utility model;

[0023] Figure 7 It is a structural schematic diagram of the check valve assembly of the utility model;

[0024] Figure 8 It is a structural schematic diagram of the muffler assembly of the utility model.

[0025] In the figure: 10, power fan; 11, fan control cabinet; 12, fan filter assembly; 101, vertical pipe; 102, sealing rubber ring; 121, pull-out fixing connector; 122, screen; 13, π-type pipe fitting; 14, check valve assembly; 141, indicator arrow; 142, flange connector; 143, valve disc fixing; 144, compressed air inlet; 15, muffler assembly; 151, honeycomb channel; 152, glass rock wool muffler filler; 153, shell; 16, air duct; 1 7. Exhaust duct; 18. Special protection door; 19. Handle; 20. Protection box; 21. Dust removal cabin; 22. Primary filter; 221. Fixed pressure strip; 222. Movable pressure piece; 23. Intermediate filter; 24. Deodorization cabin; 25. Drawer-type deodorization granular carbon box; 251. U-shaped groove; 252. Sealing plate; 26. Exhaust cabin; 201. Channel steel reinforcement rib; 202. Inner pipe interface; 203. Outer pipe interface; 204. Air pipe interface; 205. Explosion-proof lighting; 206. Ultraviolet lamp. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] See also Figure 1-8The utility model provides an embodiment: a pneumatic pipeline garbage power system with dust removal and deodorization functions, including a power mechanism and an air filtering mechanism, the power mechanism includes a power fan 10, a fan control cabinet 11, a fan filter assembly 12, a "π" type pipe fitting 13, a check valve assembly 14, a muffler assembly 15 and an air duct 16. According to the length of the pipeline and the collection and transportation situation, 2 to 3 power fans 10 are permanently installed, which are standby for each other and can meet the garbage suction of an area with a radius of 1.5 kilometers. The power fan 10 is a horizontal installation with upper inlet and upper outlet. The top of the power fan 10 is fixedly connected with the sealing rubber ring 102DN500, and both are tightened with a vertical pipe 101 clamp to avoid leakage. The fan filter assembly 12 is arranged on the air inlet section of the sealing rubber ring 102. The assembly is a plate-type structure, with a pull-out fixed connector 121 on the front, and a large-spacing filter screen 122 in the middle of the check valve assembly 14 to prevent light floating objects such as plastic bags from entering the fan cabin. The top ends of the two sealing rubber rings 102 are connected to the "π"-shaped pipe fitting 13, which is mainly used to switch the wind direction. A check valve assembly 14 is arranged in the middle of the pipe fitting, which is mainly used for bypass and coordination of operation strategies. The check valve assembly 14 is a transverse cylindrical structure, and its two ends are connected to the "π"-shaped pipe fitting 13 by flange connecting plates 142. A wind direction indication arrow 141 is arranged on the front, and the valve plate is arranged in the internal cylindrical cabin. The two sides are supported by valve disc fixings 143. The check valve assembly 14 is driven by compressed air, and a compressed air inlet 144 is arranged on the top end, which is connected to the central station building fan control cabinet 11.

[0028] The air filtering mechanism includes a protection box 20, a filter assembly and an auxiliary assembly. The lower end of the left air duct 16 is fixedly connected with the protection box 20, the filter assembly is arranged inside the protection box 20, the top of the protection box 20 is arranged with an auxiliary assembly, the outer side of the protection box 20 is fixedly installed with a special protection door 18, and the special protection door 18 is movably connected with a handle 19;

[0029] The device solves the problems of turbulent airflow, low fan efficiency, great noise caused by the high-speed suction force of the high-power fan, and inability to effectively deal with large dust particles and odors in the airflow by arranging a power mechanism and an air filtering mechanism.

[0030] Further, such as Figure 3 As shown, after passing through the main outlet pipe of the power mechanism, it is connected to the air filter mechanism protection box 20. The protection box 20 is a rectangular parallelepiped structure, the main body is welded with 3.75mm carbon steel plates, and the main beams and columns are equipped with channel steel reinforcement ribs 201; the upper right area of ​​the top of the protection box 20 is provided with an internal pipeline interface The upper left area is equipped with an external pipeline interface The front side has three special protective doors 18 with fire protection certification, and the corresponding internal cabins are (intake direction) dust removal cabin 21, deodorization cabin 24, and exhaust cabin 26. The top of each internal cabin is equipped with 3 explosion-proof lighting lamps 205 and 6 ultraviolet lamps 206 (for sterilization and disinfection of the cabin). In the dust removal cabin 21, 21 plate-type G4 primary filters 22 (595x595mm) are provided in 4 rows and 3 columns in the front matrix. After the G4 primary filters 22, 21 bag-type F8 intermediate filters 23 (595x595mm) are provided in 4 rows and 3 columns in the corresponding middle matrix. Both ends of the above-mentioned primary filters 22 and intermediate filters 23 are fixed with fixed pressure strips 221, and the corresponding two filters are connected by two movable pressing plates 222. Users can flexibly shift the position of the movable pressing plates 222 up and down according to actual use.

[0031] Further, such as Figure 5 As shown, the dust removal chamber 21, the primary filter 22 and the intermediate filter 23 are connected to the deodorization chamber 24. The deodorization chamber 24 is provided with a primary granular activated carbon adsorption material, and an equidistant drawer-type deodorization granular carbon box 25 is used. The rear end of the carbon box is limited by 4 sealing plates 252 arranged at an equal distance, and the front end is fixed with 7 groups of U-shaped grooves 251. The 3 sealing plates 252 and 6 U-shaped grooves 251 at the bottom are arranged in a horizontal direction in a 1-to-2 arrangement (a total of three groups), and the top 1 sealing plate 252 is equipped with 1 U-shaped groove 251, totaling 7 rows x 3 columns = 21 deodorization carbon boxes. Due to the staggered arrangement, the air enters horizontally, and after the primary granular activated carbon in the drawer-type deodorization granular carbon box 25 absorbs the odor from top to bottom, it enters the exhaust chamber 26, and then passes through the top connection port to exhaust outdoors. Explosion-proof lighting lamps 205 are installed on the top of the dust removal cabin 21, deodorization cabin 24 and exhaust cabin 26 to meet the needs of daily lighting and maintenance; ultraviolet lamps 206 are installed on the top of each cabin to sterilize and disinfect the cabin and reduce the spread of bacteria carried by the garbage airflow.

[0032] Further, such as Figure 3 As shown, an air pipe interface 204 is fixedly installed on the top of the dust removal cabin 21 and the primary filter 22, and a pressure sensor is set on the inner wall of the protective box 20 to detect the pressure inside the cabin. When the pressure difference before and after is too large, it is determined that the primary filter 22 and the intermediate filter 23 have absorbed a lot of dust particles and need to be cleaned or replaced.

[0033] Further, such as Figure 8 As shown, after the wind direction is switched by the "π"-shaped pipe fitting 13, the total inlet and outlet transverse air ducts on both sides of the power fan 10 are provided to the duct silencer assembly 15 to reduce the noise impact of the high-speed airflow. The silencer assembly 15 is a transverse cylindrical structure, and the protruding bodies at both ends are connecting parts with the transverse DN500, and the middle is a silencer section wrapped by an outer shell 153. A plurality of parallel and equidistant honeycomb channels 151 are arranged in the inner cabin of the silencer section, and a glass rock wool silencer filler 152 is filled between the honeycomb channel 151 and the outer shell 153 to evenly distribute air and achieve a noise reduction effect.

[0034] Working principle: Figure 1 and Figure 2 As shown, first, each power fan 10 corresponds to an independent variable frequency fan control cabinet 11. The fan control cabinet 11 and the check valve assembly 14 are electrically connected to the central control center and remotely controlled by the control center. Through the "π"-shaped pipe fitting 13, it is stably and reliably connected to the machine room pipeline system. When the front-end user delivers garbage through the delivery device, or regularly cleans the temporary storage node at the bottom of the air duct 16, the control center issues a command to open the air intake valve and the discharge valve at the check valve assembly 14 of the system, and then according to the location of the temporary storage point to be sucked, when the suction pipeline is long, all the power fans 10 equipment are turned on; when the suction path is short, only individual power fans 10 are turned on. When the corresponding power fan 10 is turned on, as shown in Figure 6 and Figure 7 As shown, the check valve assembly 14 at the top is in a closed state to prevent air backflow; the fan filter assembly 12 of the sealing rubber ring 102 can block some floating objects, thereby improving the overall operation stability of the power system. The pipe muffler assembly 15 at both ends of the power system is provided with multiple parallel honeycomb channels 151, which are equidistantly and symmetrically arranged to reduce the noise impact caused by high-speed suction.

[0035] like Figure 3 As shown, after the sucked air passes through the fan power system, it goes to the air filtration mechanism protection box 20 for dust removal and deodorization; after entering the dust removal cabin 21, it first passes through the front matrix 4 rows x 3 columns of G4 primary filter 22 to perform primary dust removal on the micro-large particles in the sucked airflow; then the air flows through the F8 intermediate filter 23, and the bag-shaped components with 4 rows x 3 columns are distributed along the airflow direction, which can collect and remove relatively small particles to reduce the particulate matter attached to the sucked air flow; after two stages of dust removal, it goes to the front end of the deodorization cabin 24, where pressure sensors are provided on the top of the dust removal cabin 21 and the deodorization cabin 24. The control center detects the front and rear pressure difference. When the data difference is too large or abnormal, it reminds the manager to replace or clean the primary filter 22 and the intermediate filter 23. The deodorization cabin 24 uses a drawer-type deodorizing particle carbon box 25 for deodorization. Figure 5 As shown, the 7 rows x 3 columns are arranged in a matrix, and the U-shaped grooves 251 and the sealing plates 252 are arranged in a staggered manner to ensure that the air flow completely passes through the carbon box assembly to avoid the spread of odor of the suctioned garbage airflow;

[0036] Then, the air after dust removal and deodorization treatment is discharged outdoors through the exhaust duct 17 at the external duct interface 203 after the equipment is installed and debugged and tested to be qualified. The outdoor discharge point of the exhaust duct 17 is usually a pipe well and a roof or a rooftop to reduce the impact on other places and pedestrian passages. The above is the entire working principle of the utility model.

[0037] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A pneumatic pipeline garbage power system with dust removal and deodorization functions, characterized by: The invention comprises a power mechanism and an air filtering mechanism, wherein the power mechanism comprises a power fan (10), a fan control cabinet (11), a fan filter assembly (12), a "π"-shaped pipe fitting (13), a check valve assembly (14), a muffler assembly (15) and an air duct (16). The upper ends of the three groups of power fans (10) are fixedly mounted with a fan filter assembly (12), the outer sides of the power fans (10) are correspondingly mounted with a fan control cabinet (11), the upper ends of the fan filter assemblies (12) are fixedly connected with a "π"-shaped pipe fitting (13), the center of the "π"-shaped pipe fitting (13) is fixedly mounted with a check valve assembly (14), the two side ends of the "π"-shaped pipe fitting (13) are fixedly connected with air ducts (16), the connection between the air duct (16) and the "π"-shaped pipe fitting (13) is provided with a muffler assembly (15), and the other end of the air duct (16) at the left end is fixedly connected with an air filtering mechanism. The air filtering mechanism comprises a protection box (20), a filter assembly and an auxiliary assembly. The lower end of the air duct (16) at the left end is fixedly connected to the protection box (20), a filter assembly is arranged inside the protection box (20), an auxiliary assembly is arranged on the top of the protection box (20), an exhaust duct (17) is fixedly connected to the left side of the protection box (20), a special protection door (18) is fixedly installed on the outside of the protection box (20), and a handle (19) is movably connected inside the special protection door (18).

2. A pneumatic pipeline garbage power system with dust removal and deodorization function according to claim 1, characterized in that: The filtering assembly comprises a dust removal chamber (21), a primary filter (22), an intermediate filter (23), a deodorization chamber (24), a drawer-type deodorization granular carbon box (25) and an exhaust chamber (26); the primary filter (22) is fixedly installed in the protection box (20); the intermediate filter (23) is fixedly connected to the left side of the primary filter (22); the drawer-type deodorization granular carbon box (25) is fixedly installed on the left side of the intermediate filter (23) in the protection box (20); the primary filter (22) and the drawer-type deodorization granular carbon box (25) divide the protection box (20) into the dust removal chamber (21), the deodorization chamber (24) and the exhaust chamber (26) from right to left in sequence.

3. The pneumatic pipeline garbage power system with dust removal and deodorization function according to claim 1 is characterized by: The auxiliary components include channel steel reinforcement ribs (201), an inner pipe interface (202), an outer pipe interface (203), an air pipe interface (204), an explosion-proof lighting lamp (205) and an ultraviolet lamp (206); four groups of channel steel reinforcement ribs (201) are fixedly installed at the four corners of the bottom of the protection box (20); the top of the protection box (20) is fixedly connected to the inner pipe interface (202); the left side of the top of the protection box (20) is fixedly connected to the outer pipe interface (203); the protection box (2 A trachea interface (204) is fixedly installed on the upper surface of the protective box (20) between the inner pipe interface (202) and the outer pipe interface (203); explosion-proof lighting lamps (205) are fixedly installed at equal intervals on the top of the inner wall of the protective box (20); an ultraviolet lamp (206) is fixedly installed outside the explosion-proof lighting lamp (205) in the protective box (20); and the positions of the explosion-proof lighting lamp (205) and the ultraviolet lamp (206) are staggered with the inner pipe interface (202) and the outer pipe interface (203).

4. The pneumatic pipeline garbage power system with dust removal and deodorization function according to claim 1 is characterized by: The check valve assembly (14) comprises an indication arrow (141), a flange connection plate (142), a valve disc fixing member (143) and a compressed air inlet (144); the inner side of the "π"-shaped pipe fitting (13) is connected to the check valve assembly (14) via the flange connection plate (142); an indication arrow (141) is provided on the outer surface of the check valve assembly (14); the outer side of the check valve assembly (14) is fixedly connected to the valve disc fixing member (143) on the right side of the indication arrow (141); and the top of the check valve assembly (14) is fixedly connected to the compressed air inlet (144).

5. The pneumatic pipeline garbage power system with dust removal and deodorization function according to claim 1 is characterized by: The muffler assembly (15) comprises a honeycomb channel (151), a glass rock wool sound-absorbing filler (152) and an outer shell (153); the honeycomb channels (151) are equidistantly arranged in the muffler assembly (15); the outer side of the muffler assembly (15) is fixedly connected to the outer shell (153); and the outer side of the honeycomb channel (151) is fixedly installed with a glass rock wool sound-absorbing filler (152) in the outer shell (153).

6. The pneumatic pipeline garbage power system with dust removal and deodorization function according to claim 1 is characterized by: The fan filter assembly (12) comprises a pull-out fixed connection piece (121) and a screen (122); the pull-out fixed connection piece (121) is fixedly installed on the outer side of the fan filter assembly (12); the screen (122) is fixedly connected inside the fan filter assembly (12); a sealing rubber ring (102) is fixedly connected to the top of the fan filter assembly (12); the other end of the sealing rubber ring (102) is fixedly connected to a "π"-shaped pipe fitting (13); and the inner side of the bottom of the fan filter assembly (12) is fixedly connected to a vertical pipe (101).

7. The pneumatic pipeline garbage power system with dust removal and deodorization function according to claim 2 is characterized by: A fixed pressure strip (221) is fixedly connected to the outer side of the primary filter (22), the primary filters (22) are fixedly connected to each other via a movable pressure sheet (222), U-shaped grooves (251) are fixedly connected at equal intervals inside the drawer-type deodorizing granular carbon box (25), and a sealing plate (252) is fixedly installed between the U-shaped grooves (251).

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