Washing device for triphenylphosphine production

Abstract

The utility model discloses a washing device for triphenylphosphine production, and relates to the technical field of chemical production equipment. The washing device comprises a washing tank, the top of the washing tank is fixedly connected with a tank cover, a cleaning cylinder is arranged in the washing tank through a rotating assembly, and a drying assembly is further arranged on the tank cover; a rotating plate in the rotating assembly is rotationally connected to the bottom of the inner side of the washing box, a lead screw is rotationally connected into a sliding groove in the rotating plate, the outer wall of the lead screw is sleeved with a first sliding block in a threaded mode, and a mounting disc is fixedly connected to the top of the first sliding block. According to the triphenylphosphine crystal cleaning device, the bottom of the cleaning cylinder is magnetically adsorbed to the mounting disc through a magnetic suction plate in the rotating assembly, the problem that in the prior art, the cleaning cylinder is inconvenient to assemble and disassemble rapidly is solved, and hot air in the heating box is input into the cleaning cylinder through an air outlet cover and a telescopic hose in the drying assembly to dry washed triphenylphosphine crystals; the problem that in the prior art, washed crystals cannot be dried rapidly and conveniently is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical production equipment, in particular to a water washing device for triphenylphosphine production. Background Art

[0002] With the development of society, people's daily life and production have an increasing demand for various compounds, which leads to an increasing production volume of various compounds. The production of various compounds is inseparable from production equipment. Among them, the water washing device is a relatively common chemical production equipment, which is mainly used to wash the concentrated crystals in the production process. It is often used in the production of triphenylphosphine, o-chlorobenzonitrile and other compounds. The overall structure of the water washing device of various compounds is the same, and the difference lies in the different types of solvents used;

[0003] The existing document with publication number CN219503342U discloses a water washing device for o-chlorobenzonitrile crystals, comprising: a water bucket, mounting platforms are fixedly installed on both sides of the water bucket, mounting shafts are fixedly connected to the sides of the two mounting platforms away from each other, and an inner gear ring is fixedly installed on the top of the water bucket; a frame, fixing plates are fixedly installed on both sides of the top of the frame, and the two fixing plates are respectively rotatably sleeved on the outer sides of the corresponding mounting shafts; a rotating plate, which is arranged on the inner wall of the bottom of the water bucket; two washing buckets, which are respectively rotatably arranged on both sides of the top of the rotating plate, and a plurality of through holes are opened on the outer sides of the washing buckets, and a driven gear ring is fixedly sleeved on the outer sides of the washing buckets;

[0004] However, it still has the following disadvantages in actual use:

[0005] In the above-mentioned water washing device, the two washing buckets are rotatably arranged on both sides of the top of the rotating plate, and the rotating plate is rotatably installed at the bottom of the water bucket. The rotating plate drives the two groups of washing buckets to rotate, thereby completing the washing work of the crystal products in the washing buckets. However, it is not convenient to quickly install and disassemble the washing buckets, resulting in inconvenience in replacing the washing buckets when they are damaged. At the same time, it is also not convenient to choose to use one or two groups of washing buckets to wash the crystal products according to the production volume;

[0006] In the water washing device mentioned above, the water bucket is rotatably installed between two groups of mounting platforms, and two groups of washing buckets are rotatably installed inside the water bucket through a rotating plate. The washing buckets are driven to rotate inside the water bucket by the rotating plate, thereby completing the washing of crystalline products such as triphenylphosphine and o-chlorobenzonitrile. However, it lacks a structure for quickly drying the washed crystalline products, resulting in residual washing solvent on the crystalline products.

[0007] For this reason, we provide a kind of water washing device of triphenylphosphine production, in order to solve the above-mentioned problem. Utility Model Content

[0008] The utility model aims to provide a water washing device for producing triphenylphosphine, wherein the bottom of a washing cylinder is magnetically adsorbed on a mounting plate by a magnetic attraction plate in a rotating assembly, thereby solving the existing problem that it is inconvenient to quickly load and unload the washing cylinder, and hot air in a heating box is input into the washing cylinder by an air outlet hood and a telescopic hose in a drying assembly to dry the washed triphenylphosphine crystals, thereby solving the existing problem that it is inconvenient to quickly dry the washed crystals.

[0009] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0010] The utility model discloses a water washing device for producing triphenylphosphine, comprising a water washing box, a box cover is fixedly connected to the top of the water washing box, a washing cylinder is arranged inside the water washing box through a rotating component, and a drying component is also arranged on the box cover;

[0011] The rotating plate in the rotating assembly is rotatably connected to the inner bottom of the washing box, the sliding groove on the rotating plate is rotatably connected to a screw rod, a first slider is threadedly sleeved on the outer wall of the screw rod, the top of the first slider is fixedly connected to a mounting plate, and a magnetic suction plate is fixedly connected to the groove on the top of the mounting plate;

[0012] The second slider in the drying assembly is movably connected to both sides of the through groove on the top of the box cover, the bottom of the second slider is fixedly connected to a fixed plate, the bottom of the fixed plate is fixedly connected to an air outlet hood, a telescopic hose passes through the top of the air outlet hood, and the end of the telescopic hose away from the air outlet hood passes through the fixed plate, the second slider and both sides of the heating box at the rear end of the top of the box cover in turn and extends to the bottom of the interior of the heating box, and the first fan and the electric radiation tube are fixedly connected to the upper and lower parts of the interior of the heating box respectively.

[0013] The utility model is further configured as follows: a rotating rod is fixedly connected to the lower surface of the rotating plate, the bottom end of the rotating rod rotates through the bottom of the washing box and extends to the bottom of the washing box, a second drive motor is fixedly connected to the rear end surface of the washing box through a motor frame, and a synchronous wheel is sleeved on the bottom end of the rotating rod and the output shaft of the second drive motor, and the synchronous wheels are connected by belt transmission.

[0014] The utility model is further configured as follows: a plurality of groups of supporting legs are welded to the bottom of the water washing box, and the supporting legs are distributed in a circular array.

[0015] The utility model is further configured as follows: the slide grooves are respectively opened at the front and rear ends of the upper surface of the rotating plate in the transverse direction, a waterproof shell is fixedly connected to one side of the interior of the slide groove, a first drive motor is fixedly connected to the interior of the waterproof shell, an output shaft of the first drive motor is fixedly connected to one end of the screw rod, and the other end of the screw rod is rotatably connected to the inner wall on the other side of the slide groove.

[0016] The utility model is further configured as follows: a plurality of through holes are evenly arranged on the outer side of the cleaning cylinder, positioning holes are arranged around the bottom of the cleaning cylinder, positioning columns are gap-fitted inside the positioning holes, and the bottom ends of the positioning columns are respectively welded around the top of the mounting plate.

[0017] The utility model is further configured as follows: the through slot is horizontally opened at the top center of the box cover, both sides of the box cover are fixedly connected with electric push rods, and the piston shafts of the electric push rods are fixedly connected to the outer wall of the second sliding block on the side away from each other.

[0018] The utility model is further configured as follows: both sides of the lower surface of the fixing plate are fixedly connected with fixing rods, the bottom ends of the fixing rods are respectively welded to both sides of the top of the air outlet cover, and a filter screen is clamped inside the air outlet cover.

[0019] The utility model is further configured as follows: a second fan is fixedly connected to the rear end face of the box cover, a first connecting pipe is fixedly connected to the air outlet end of the second fan, an end of the first connecting pipe away from the second fan passes through the rear end face of the heating box and extends to the upper part of the interior of the heating box, a second connecting pipe is fixedly connected to the air inlet end of the second fan, an end of the second connecting pipe away from the second fan passes through one side of the rear end face of the box cover and is fixedly connected to an air inlet hood, and the air inlet hood is located on the inner side of the box cover.

[0020] The utility model has the following beneficial effects:

[0021] The utility model provides a rotating component, and the bottom of the cleaning cylinder is magnetically attracted by the magnetic force of the magnetic attraction plate, so that the cleaning cylinder can be installed on the rotating plate, and the cleaning cylinder is driven to rotate inside the washing box by the rotating plate, so that the triphenylphosphine crystals in the cleaning cylinder can be washed, and the installation and disassembly of the cleaning cylinder is convenient, and then it is convenient to inspect and replace it, and it is also convenient to unload the washed triphenylphosphine crystals.

[0022] The utility model provides a drying component, heats the air in the heating box through the electric radiation tube, and uses the first fan to send the hot air in the heating box through the telescopic hose and the air outlet cover to the inner side of the cleaning cylinder, thereby achieving the drying of the triphenylphosphine crystals after washing in the cleaning cylinder, and at the same time, the air in the water washing box is re-introduced into the heating box through the second fan for secondary heating, thereby achieving the circulation of hot air in the water washing box, thereby increasing the contact time between the hot air and the triphenylphosphine crystals and improving the drying effect.

[0023] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are 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 creative work.

[0025] Figure 1 It is a schematic diagram of the overall structure of a water washing device for producing triphenylphosphine;

[0026] Figure 2 This is a schematic diagram of the structure of the water washing box of the utility model;

[0027] Figure 3 It is a structural schematic diagram of the rotating assembly of the utility model;

[0028] Figure 4 It is a structural schematic diagram of the screw rod of the utility model;

[0029] Figure 5 This is a structural disassembly diagram of the installation plate of the utility model;

[0030] Figure 6 This is a schematic diagram of the structure of the cleaning cylinder of the utility model;

[0031] Figure 7 This is a schematic diagram of the structure of the drying component of the utility model;

[0032] Figure 8 This is a schematic diagram of the structure of the air outlet cover of the utility model;

[0033] Fig. 9 It is a structural schematic diagram of the second fan of the utility model.

[0034] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0035] 1-washing box, 101-supporting foot, 2-box cover, 201-through slot, 3-rotating assembly, 301-turn plate, 301a-rotating rod, 301b-synchronous wheel, 301c-belt, 301d-slideway, 302-screw, 302a-waterproof shell, 302b-first drive motor, 303-first slider, 304-mounting plate, 304a-groove, 304b-positioning column, 305-magnetic plate, 306-second drive motor , 306a-motor frame, 4-cleaning cylinder, 401-through hole, 402-positioning hole, 5-drying component, 501-second slider, 502-fixing plate, 503-air outlet cover, 503a-fixing rod, 503b-filter, 504-telescopic hose, 505-heating box, 506-first fan, 507-electric radiation tube, 508-second fan, 508a-first connecting pipe, 508b-second connecting pipe, 508c-air inlet cover. DETAILED DESCRIPTION

[0036] 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 of 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. Specific embodiment 1

[0037] See also Figure 1-6 As shown, it is the first embodiment of the utility model, which provides a water washing device for producing triphenylphosphine, including a water washing box 1, a box cover 2, a rotating component 3 and a cleaning cylinder 4, and the rotating component 3 includes a rotating plate 301, a screw rod 302, a first slider 303, a mounting disk 304 and a magnetic plate 305. The bottom of the cleaning cylinder 4 is magnetically adsorbed on the mounting disk 304 through the magnetic plate 305, which solves the existing problem of inconvenience in installing and disassembling the cleaning cylinder 4.

[0038] Specifically, the rotating plate 301 is rotatably connected to the inner bottom of the washing box 1, and the guide groove 301d on the rotating plate 301 is rotatably connected to the screw rod 302, and the outer wall of the screw rod 302 is threadedly sleeved with a first slider 303, and the top of the first slider 303 is fixedly connected to a mounting disk 304, and the groove 304a at the top of the mounting disk 304 is fixedly connected to a magnetic plate 305. The rotating plate 301 is used to drive the mounting disk 304 to rotate on the inner side of the washing box 1, and at the same time, the screw rod 302 and the first slider 303 are used to adjust the position of the mounting disk 304 on the rotating plate 301, and the mounting disk 304 and the magnetic plate 305 are used to fix the cleaning cylinder 4.

[0039] Furthermore, a rotating rod 301a is fixedly connected to the lower surface of the rotating plate 301, and the bottom end of the rotating rod 301a rotates through the bottom of the washing tank 1 and extends to the bottom of the washing tank 1. The second driving motor 306 is fixedly connected to the rear end surface of the washing tank 1 through a motor frame 306a. The bottom end of the rotating rod 301a and the output shaft of the second driving motor 306 are both sleeved with a synchronous wheel 301b, and the synchronous wheels 301b are connected by a belt 301c. The rotating rod 301a is used to movably install the rotating plate 301 on the inner side of the washing tank 1 and drive the rotating plate 301 to rotate. The synchronous wheel 301b and the belt 301c are used to drive the rotating rod 301a to rotate, and the synchronous wheel 301b is driven to rotate by the second driving motor 306. The motor frame 306a is used to install the second driving motor 306.

[0040] A plurality of support legs 101 are welded to the bottom of the water washing box 1. The support legs 101 are arranged in a circular array. The support legs 101 are used to support the water washing box 1. The water washing box 1 is also provided with a drain pipe and a drain valve to discharge the washing solvent in the water washing box 1.

[0041] The slide grooves 301d are respectively opened at the front and rear ends of the upper surface of the rotating plate 301 in the transverse direction, and the inner side of the slide grooves 301d is fixedly connected with the waterproof shell 302a, and the inner side of the waterproof shell 302a is fixedly connected with the first drive motor 302b, and the output shaft of the first drive motor 302b is fixedly connected to one end of the screw rod 302, and the other end of the screw rod 302 is rotatably connected to the inner wall of the other side of the slide groove 301d. The slide groove 301d is used to install the screw rod 302, and the screw rod 302 is driven to rotate by the setting of the first drive motor 302b, and the waterproof shell 302a is used to protect the first drive motor 302b to prevent the first drive motor 302b from contacting the washing solvent in the washing box 1;

[0042] A plurality of through holes 401 are evenly arranged on the outer surface of the cleaning cylinder 4, and positioning holes 402 are arranged around the bottom of the cleaning cylinder 4. Positioning posts 304b are loosely fitted inside the positioning holes 402, and the bottom ends of the positioning posts 304b are respectively welded around the top of the mounting plate 304. The through holes 401 are used to introduce the washing solvent in the washing box 1 into the inner side of the cleaning cylinder 4. The positioning holes 402 and the positioning posts 304b realize the positioning between the cleaning cylinder 4 and the mounting plate 304.

[0043] The operation process of this embodiment is as follows: first, open the box cover 2, and put the triphenylphosphine crystal into the cleaning cylinder 4, then place the cleaning cylinder 4 on both sides of the inside of the water washing box 1, and position the cleaning cylinder 4 and the mounting plate 304 through the clearance fit between the positioning column 304b and the positioning hole 402. When the cleaning cylinder 4 is positioned, the power of the magnetic attraction plate 305 is turned on, so that the bottom of the cleaning cylinder 4 is magnetically attracted by the magnetism generated by the magnetic attraction plate 305 after power is turned on, and the installation of the cleaning cylinder 4 is completed. Finally, add washing solvent to the inside of the water washing box 1 and close the box cover 2, and start the second drive motor 306 at the same time. The output shaft of the second drive motor 306 drives the rotating rod 301a and the rotating plate 301 to rotate through the transmission connection between the synchronous wheel 301b and the belt 301c, so that the cleaning cylinder 4 rotates on the inner side of the water washing box 1, thereby realizing the washing of the triphenylphosphine crystals. Specific embodiment 2

[0044] See also Figure 7-9 As shown, it is the second embodiment of the utility model, which is based on the previous embodiment, but is different from the previous embodiment in that: a drying component 5 is also arranged on the box cover 2, and the drying component 5 includes a second slider 501, an air outlet hood 503, a heating box 505, a first fan 506 and an electric radiation tube 507. The air in the heating box 505 is heated by the electric radiation tube 507, and the heated air is sent into the cleaning cylinder 4 through the air outlet hood 503 and the first fan 506 to dry the washed triphenylphosphine crystals, thereby solving the existing problem of inconvenience in quickly drying the washed crystals.

[0045] Specifically, the second slider 501 is movably connected to both sides of the through slot 201 at the top of the box cover 2, the bottom of the second slider 501 is fixedly connected to a fixed plate 502, the bottom of the fixed plate 502 is fixedly connected to an air outlet hood 503, the top of the air outlet hood 503 is penetrated by a telescopic hose 504, and the end of the telescopic hose 504 away from the air outlet hood 503 sequentially penetrates the fixed plate 502, the second slider 501 and both sides of the heating box 505 located at the rear end of the top of the box cover 2 and extends to the bottom of the interior of the heating box 505, and the top and bottom of the interior of the heating box 505 are respectively fixedly connected to the first fan 506 and the electric fan 507. The radiation tube 507 and the second slider 501 are used to drive the air outlet hood 503 to move so that the air outlet hood 503 is consistent with the cleaning tube 4. The fixing plate 502 is used to install the air outlet hood 503, and the hot air is completely sent into the cleaning tube 4 through the setting of the air outlet hood 503. The telescopic hose 504 is used to connect the air outlet hood 503 and the heating box 505, and a valve is provided on the telescopic hose 504. The heating box 505 and the electric radiation tube 507 are used to heat the air. The first fan 506 is used to send the hot air into the air outlet hood 503.

[0046] Furthermore, the through slot 201 is horizontally opened at the top center of the box cover 2, and electric push rods are fixedly connected to both sides of the box cover 2. The piston shaft of the electric push rod is fixedly connected to the outer wall of the second slider 501 away from each other. The electric push rod is used to apply an external force to the second slider 501, so that the second slider 501 drives the air outlet cover 503 to slide on the inner side of the box cover 2.

[0047] Both sides of the lower surface of the fixing plate 502 are fixedly connected with fixing rods 503a, the bottom ends of the fixing rods 503a are respectively welded to the top sides of the air outlet cover 503, and the inside of the air outlet cover 503 is clamped with a filter 503b. The setting of the fixing rods 503a is used to fix the air outlet cover 503 below the fixing plate 502, and the setting of the filter 503b prevents dust in the heating box 505 from entering the cleaning cylinder 4;

[0048] A second fan 508 is fixedly connected to the rear end face of the box cover 2, and a first connecting pipe 508a is fixedly connected to the air outlet end of the second fan 508. One end of the first connecting pipe 508a away from the second fan 508 passes through the rear end face of the heating box 505 and extends to the upper part of the interior of the heating box 505. A second connecting pipe 508b is fixedly connected to the air inlet end of the second fan 508. One end of the second connecting pipe 508b away from the second fan 508 passes through one side of the rear end face of the box cover 2 and is fixedly connected to an air inlet cover 508c. The air inlet cover 508c is located on the inner side of the box cover 2. The setting of the second fan 508 realizes the introduction of air in the washing box 1 into the inner side of the heating box 505. The setting of the first connecting pipe 508a and the second connecting pipe 508b realizes the mutual penetration of the internal space of the washing box 1 and the internal space of the heating box 505. A valve is also provided on the second connecting pipe 508b. The setting of the air inlet cover 508c facilitates the collection of air in the washing box 1.

[0049] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0050] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A water washing device for producing triphenylphosphine, comprising a water washing box (1), the top of which is fixedly connected with a box cover (2), characterized in that: The washing box (1) is provided with a cleaning cylinder (4) via a rotating assembly (3), and a rotating plate (301) in the rotating assembly (3) is rotatably connected to the inner bottom of the washing box (1), a screw rod (302) is rotatably connected to the inside of a slide groove (301d) on the rotating plate (301), and a first sliding block (303) is threadedly sleeved on the outer wall of the screw rod (302), a mounting plate (304) is fixedly connected to the top of the first sliding block (303), and a magnetic attraction plate (305) is fixedly connected to the inside of a groove (304a) at the top of the mounting plate (304); The box cover (2) is also provided with a drying assembly (5), and the second slider (501) in the drying assembly (5) is movably connected to the inner sides of the through slot (201) at the top of the box cover (2), the bottom of the second slider (501) is fixedly connected to a fixing plate (502), and the lower side of the fixing plate (502) is fixedly connected to an air outlet hood (503), the top of the air outlet hood (503) is penetrated by a telescopic hose (504), and the end of the telescopic hose (504) away from the air outlet hood (503) sequentially penetrates the fixing plate (502), the second slider (501) and the two sides of the heating box (505) located at the rear end of the top of the box cover (2) and extends to the lower side of the interior of the heating box (505), and the upper side and the lower side of the interior of the heating box (505) are fixedly connected to the first fan (506) and the electric radiation tube (507), respectively.

2. A water washing device for producing triphenylphosphine according to claim 1, characterized in that: A rotating rod (301a) is fixedly connected to the lower surface of the rotating plate (301), and the bottom end of the rotating rod (301a) rotates through the bottom of the washing box (1) and extends to the bottom of the washing box (1). A second drive motor (306) is fixedly connected to the rear end surface of the washing box (1) via a motor frame (306a), and a synchronous wheel (301b) is sleeved on the bottom end of the rotating rod (301a) and the output shaft of the second drive motor (306), and the synchronous wheels (301b) are connected to each other via a belt (301c).

3. A water washing device for producing triphenylphosphine according to claim 2, characterized in that: A plurality of groups of supporting legs (101) are welded to the bottom of the water washing box (1), and the supporting legs (101) are distributed in a circular array.

4. A water washing device for producing triphenylphosphine according to claim 1, characterized in that: The slide groove (301d) is respectively opened at the front and rear ends of the upper surface of the rotating plate (301) in the transverse direction, and a waterproof shell (302a) is fixedly connected to one side of the interior of the slide groove (301d), and a first drive motor (302b) is fixedly connected to the interior of the waterproof shell (302a), and the output shaft of the first drive motor (302b) is fixedly connected to one end of the screw rod (302), and the other end of the screw rod (302) is rotatably connected to the inner wall on the other side of the slide groove (301d).

5. A water washing device for producing triphenylphosphine according to claim 1, characterized in that: The outer surface of the cleaning cylinder (4) is evenly provided with a plurality of through holes (401), and the bottom of the cleaning cylinder (4) is provided with positioning holes (402) on all sides, and positioning columns (304b) are loosely fitted inside the positioning holes (402), and the bottom ends of the positioning columns (304b) are respectively welded to the top of the mounting plate (304) on all sides.

6. A water washing device for producing triphenylphosphine according to claim 1, characterized in that: The through slot (201) is laterally opened at the top center position of the box cover (2), and electric push rods are fixedly connected to both sides of the box cover (2), and the piston shafts of the electric push rods are fixedly connected to the outer wall of the second sliding block (501) on the side away from each other.

7. A water washing device for producing triphenylphosphine according to claim 1, characterized in that: Both sides of the lower surface of the fixing plate (502) are fixedly connected with fixing rods (503a), and the bottom ends of the fixing rods (503a) are respectively welded to both sides of the top of the air outlet cover (503), and a filter screen (503b) is clamped inside the air outlet cover (503).

8. A water washing device for producing triphenylphosphine according to claim 1, characterized in that: A second fan (508) is fixedly connected to the rear end surface of the box cover (2), and a first connecting pipe (508a) is fixedly connected to the air outlet end of the second fan (508); an end of the first connecting pipe (508a) away from the second fan (508) passes through the rear end surface of the heating box (505) and extends to the upper part of the interior of the heating box (505); an air inlet end of the second fan (508) is fixedly connected to the second connecting pipe (508b); an end of the second connecting pipe (508b) away from the second fan (508) passes through one side of the rear end surface of the box cover (2) and is fixedly connected to an air inlet cover (508c); and the air inlet cover (508c) is located on the inner side of the box cover (2).

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