Induced draft fan

Abstract

The invention relates to the technical field of induced draft fans, in particular to an induced draft fan which is mainly characterized in that a connecting pipeline is arranged at the connecting position of a smoke suction port of the induced draft fan and a boiler, an auxiliary mechanism is further arranged in the connecting pipeline, a filtering mechanism in the auxiliary mechanism filters sucked smoke, impurities in the smoke are prevented from being accumulated in the induced draft fan as much as possible, and the smoke suction port of the induced draft fan is communicated with the boiler. The stable operation of the induced draft fan is ensured; in addition, a cooling assembly is arranged, namely a water conveying opening is used in cooperation with a circulation main pipe, a communicating branch pipe and a capillary network, so that a cooling effect is provided for filtered smoke, and the influence of high temperature on the work of the induced draft fan is avoided; on the basis that the capillary network provides cooling, the capillary network and the filtering mechanism further work in a matched mode, the capillary network can further provide a filtering assisting function, the filtering mechanism is arranged on the bearing frame, the bearing frame is detachably arranged in the bearing box, dismounting and mounting are convenient, and the cooling effect is good. And subsequent maintenance work such as cleaning and replacement is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of induced draft fans, in particular to induced draft fans. Background Art

[0002] An induced draft fan is a device that generates negative pressure by rotating its impeller and then extracts air from the system (equipment). It is usually installed at the tail end of the boiler to extract hot flue gas from the furnace. In daily life, fans are usually divided into induced draft fans (used under negative pressure) and blowers (used under positive pressure) according to their positive or negative pressure usage.

[0003] The existing document with publication number CN110857695A discloses an induced draft fan for a boiler, which includes a turbine housing, a ventilation mesh cover and a protective cover. An air outlet is provided above the turbine housing, the protective cover and the turbine housing are fixedly connected, screws are provided on the outer surface of the insulation flange, a fan is provided on the inner surface of the motor, an air inlet is provided below the turbine housing, and a fixing screw is provided on the outer surface of the fixed connecting plate. The provided rubber pad, thermal insulation flange and screws can increase the friction resistance between the equipment and the ground, thereby improving the overall stability of the equipment, and can also separate the motor and turbine housing to prevent heat from being transferred to the motor, thereby achieving a good thermal insulation and heat dissipation effect; furthermore, the document with publication number CN114526253A discloses a small boiler induced draft fan, which includes a volute, an impeller and a driving device for outputting rotational power; the driving device is directly or indirectly fixedly connected to the volute; the impeller is arranged in the inner cavity of the volute and is fixedly connected to the rotating output end of the driving device; the volute is provided with an induced draft inlet and an induced draft outlet, and the impeller is fixedly provided with impeller blades, and the impeller blades push the air as the impeller rotates to keep the air away from the rotation axis of the impeller; its solution prevents the hot air discharged from the boiler from passing through the driving device, thereby preventing the driving device from being damaged by high temperature.

[0004] In the prior art, the induced draft fan equipment used in the boiler draws the smoke in the boiler out from the smoke intake port and then discharges it from the smoke exhaust port. In order to improve its environmental friendliness, a corresponding filtering device is generally provided at the smoke exhaust port. On the one hand, the existing filtering device generally has a simple filter net with a single function; on the other hand, there is a lack of a corresponding filtering mechanism at the smoke intake port, which causes impurities in the smoke to accumulate inside the induced draft fan. After working for a long time, it has a certain impact on the normal operation of the induced draft fan; furthermore, the heat in the smoke will also affect its operation when passing through the induced draft fan; and the disassembly, cleaning and maintenance of the later filtering device are relatively inconvenient, and corresponding improvements and optimizations are required.

[0005] To this end, the present invention proposes an induced draft fan to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide an induced draft fan to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions: an induced draft fan, comprising an induced draft fan body, a smoke extraction port, a smoke exhaust port, a connecting pipe and an auxiliary mechanism; The induced draft fan body is provided with a smoke intake port and a smoke exhaust port; The connecting end of the smoking port is fixedly provided with a frame-shaped connecting flange, and the smoking port is connected to the connecting pipe; frame-shaped docking flanges are symmetrically fixedly provided at both ends of the connecting pipe, and a bearing box body is provided on the connecting pipe; An auxiliary mechanism is arranged in the carrying box body.

[0008] Preferably, a mounting slot is provided at the top of the carrying box body, and a threaded groove is provided in the mounting slot.

[0009] Preferably, the auxiliary mechanism includes a loading assembly and a filtering mechanism; wherein the loading assembly includes a mounting card, a lifting handle, a cooling water pipe, a water port, a sealing slot, a positioning plate, a connecting nozzle, a sealing clamp ring, a supporting frame and a cooling assembly; a lifting handle is fixedly provided on the top surface of the mounting card, and the water port is symmetrically provided in the mounting card, the top end of the water port is connected with a cooling water pipe, and the bottom end of the water port is provided with a sealing slot, the positioning plate is fixedly provided at the top side position of the supporting frame, and the positioning plate is fixedly connected to the mounting card by screws, the mounting card is adapted to be clamped in the mounting slot, and the mounting card is fixed by screws.

[0010] Preferably, a connecting nozzle is provided at the top of the supporting frame, a sealing clamp is sleeved on the connecting nozzle, and a cooling assembly is provided inside the supporting frame; the connecting nozzle is adapted to be plugged in with the water inlet, the sealing clamp and the sealing slot are provided with the same number of groups, and the two are sealed and plugged in.

[0011] Preferably, the cooling assembly comprises a circulation main pipe, a connecting branch pipe and a capillary network; the circulation main pipe is connected to the connecting nozzle, and a connecting branch pipe is provided on one side of the circulation main pipe, and the connecting branch pipe is connected to the capillary network.

[0012] Preferably, the filtering mechanism is arranged on one side of the carrying frame, and the filtering mechanism includes a loading slot, a carrying plate, a loading card plate, an auxiliary handle, a accommodating slot and auxiliary accessories; the loading slot is arranged at a frame opening position on one side of the carrying frame, and a threaded groove is arranged in the loading slot, a loading card plate is fixedly arranged at the side position of the carrying plate, the loading card plate is clamped in the loading slot and fixed by screws, an auxiliary handle is fixedly arranged on the carrying plate, and accommodating slots are equidistantly arranged in the carrying plate, and auxiliary accessories are arranged in the accommodating slots.

[0013] Preferably, the bearing plate body corresponds to the setting position of the capillary network, the capillary network is set in the middle position of the bearing frame body, and the bearing plate body is set at one end position of the bearing frame body.

[0014] Preferably, the auxiliary accessories include a limit slot, a first magnetic ring, an auxiliary pipe fitting, a limit stop ring, a second magnetic ring, an internal threaded connecting groove, an external threaded connecting ring body, an auxiliary cap body and a filter hole body; the limit slot is arranged at a notch position at one end of the accommodating groove body, a limit stop ring is fixedly arranged at one end of the auxiliary pipe fitting, an internal threaded connecting groove is arranged on the inner side wall of the other end of the auxiliary pipe fitting, the internal threaded connecting groove is threadedly connected with the external threaded connecting ring body, the external threaded connecting ring body is fixedly arranged at one end of the auxiliary cap body, and filter holes are evenly arranged in the auxiliary cap body.

[0015] Preferably, a first magnetic ring is fixedly disposed in the limit slot, and a second magnetic ring is fixedly disposed on one side of the limit stop ring. The second magnetic ring and the first magnetic ring are disposed at corresponding positions and in the same number of groups, and the two attract each other.

[0016] Preferably, the auxiliary pipe fitting is placed in the accommodating slot body, and one auxiliary pipe fitting is arranged in the accommodating slot body, and the pipe diameter of the auxiliary pipe fitting is set equal to the slot diameter of the accommodating slot body; the filtering hole body is set to be a frustum shape, that is, the large mouth end of the filtering hole body is set at the inner end of the auxiliary cap body, and the small mouth end of the filtering hole body is set at the outer end of the auxiliary cap body.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The induced draft fan designed by the present invention mainly has a connecting pipe arranged at the connection position between the smoke exhaust port of the induced draft fan and the boiler, and an auxiliary mechanism is arranged in the connecting pipe. The filtering mechanism in the auxiliary mechanism filters the extracted flue gas to avoid the accumulation of impurities in the flue gas inside the induced draft fan as much as possible, thereby ensuring the stable operation of the induced draft fan; furthermore, a cooling effect is provided for the filtered flue gas through the coordinated use of the water delivery port, the circulation main pipe, the connecting branch pipe, and the capillary network, thereby avoiding the high temperature from affecting the operation of the induced draft fan; on the basis of providing cooling, the capillary network and the filtering mechanism also have a coordinated work, and the capillary network can also provide an auxiliary filtering effect to further improve its filtering effect; and the filtering mechanism is arranged on the bearing frame, and the bearing frame in the present invention is detachably arranged in the bearing box body, and is convenient to disassemble and assemble, thereby facilitating subsequent cleaning, replacement and other maintenance work. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structural connection of the induced draft fan of the present invention; Figure 2It is a lateral schematic diagram of the structure connection of the induced draft fan of the present invention; Figure 3 It is a schematic diagram of the connection between the exhaust port of the induced draft fan and the connecting pipe and the auxiliary mechanism structure of the present invention; Figure 4 This is a schematic diagram of the connection between the connecting pipeline and the auxiliary mechanism structure of the present invention; Figure 5 It is a top view of the connection between the loading assembly and the filtering mechanism structure of the present invention; Figure 6 For the present invention Figure 5 A magnified schematic diagram of the structural connection at center A; Figure 7 A bottom view of the connection between the loading assembly and the filtering mechanism structure of the present invention; Figure 8 For the present invention Figure 7 A magnified schematic diagram of the structural connection at B in the middle; Fig. 9 It is a schematic diagram of the connection between the filter mechanism and the bearing frame structure of the present invention; Fig.10 For the present invention Fig. 9 A magnified schematic diagram of the structural connection at C in the middle; Fig.11 It is a schematic diagram of the connection of the load-bearing plate structure of the present invention; Fig.12 It is a partial schematic diagram of the connection between the load-bearing plate body and the auxiliary accessory structure of the present invention; Fig.13 This is a schematic diagram of the connection of the auxiliary accessory structure of the present invention; Fig.14 For the present invention Fig.13 Enlarged schematic diagram of the structural connection at point D in the middle.

[0019] In the figure: induced draft fan body 1, smoke extraction port 2, frame-type connecting flange 21, smoke exhaust port 3, connecting pipe 4, frame-type docking flange 41, carrying box body 42, mounting slot 43, mounting card plate 501, lifting handle 502, cooling water pipe 503, water delivery port 504, sealing slot 505, positioning plate 506, connecting nozzle 507, sealing clamp ring 508, carrying frame 509, circulation main pipe 601, connecting branch pipe 602, capillary network 603, loading slot 701, carrying plate body 702, loading card plate 703, auxiliary handle 704, accommodating slot body 705, limiting slot 801, first magnetic ring 802, auxiliary pipe fitting 803, limiting retaining ring 804, second magnetic ring 805, internal thread connecting slot 806, external thread connecting ring body 807, auxiliary cap body 808, filtering hole body 809. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention are described clearly and completely below. The embodiments of the present invention and all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0021] Example 1: Please refer to Figure 1-Figure 14 The induced draft fan comprises an induced draft fan body 1, a smoke intake port 2, a smoke exhaust port 3, a connecting pipe 4 and an auxiliary mechanism; wherein the induced draft fan body 1 is provided with a smoke intake port 2 and a smoke exhaust port 3; wherein a frame-type connecting flange 21 is fixedly provided at the connecting end of the smoke intake port 2, and the smoke intake port 2 is connected to the connecting pipe 4; frame-type docking flanges 41 are symmetrically fixedly provided at both ends of the connecting pipe 4, and a carrying box body 42 is provided on the connecting pipe 4; an auxiliary mechanism is provided in the carrying box body 42; an installation slot 43 is provided at the top of the carrying box body 42, and a threaded groove is provided in the installation slot 43, wherein the frame-type docking flange 41 at one end of the connecting pipe 4 is connected to the smoke intake port 2, and the other end of the connecting pipe 4 is connected to the boiler.

[0022] Therefore, the present invention mainly sets a connecting pipe 4 at the connection position between the smoke outlet 2 of the induced draft fan and the boiler, and sets an auxiliary mechanism in the connecting pipe 4. The filtering mechanism in the auxiliary mechanism filters the extracted flue gas to avoid the accumulation of impurities in the flue gas inside the induced draft fan as much as possible, thereby ensuring the stable operation of the induced draft fan; furthermore, a cooling effect is provided for the filtered flue gas through the setting of a cooling component, that is, through the coordinated use of the water inlet 504 with the circulation main pipe 601, the connecting branch pipe 602, and the capillary network 603, thereby avoiding the high temperature from affecting the operation of the induced draft fan; on the basis of providing cooling, the capillary network 603 and the filtering mechanism also have a coordinated work, and the capillary network 603 can also provide an auxiliary filtering effect to further improve its filtering effect.

[0023] Example 2: Based on Example 1, please refer to Figure 4-Figure 14, the auxiliary mechanism here includes a loading assembly and a filtering mechanism; wherein the loading assembly includes a mounting card plate 501, a lifting handle 502, a cooling water pipe 503, a water port 504, a sealing slot 505, a positioning plate 506, a connecting nozzle 507, a sealing clamp ring 508, a bearing frame 509 and a cooling assembly; the top surface of the mounting card plate 501 is fixedly provided with a lifting handle 502, and the mounting card plate 501 is symmetrically provided with a water port 504, the top of the water port 504 is connected with a cooling water pipe 503, the bottom of the water port 504 is provided with a sealing slot 505, the positioning plate 506 is fixedly provided at the top side position of the bearing frame 509, and the positioning plate 506 is fixedly connected to the mounting card plate 501 by screws , the mounting card plate 501 is adapted to be snap-fitted with the mounting card slot 43, and the mounting card plate 501 is fixed by screws; a connecting nozzle 507 is provided at the top of the bearing frame 509, a sealing clamp ring 508 is sleeved on the connecting nozzle 507, and a cooling component is provided on the inner side of the bearing frame 509; the connecting nozzle 507 is adapted to be plugged in with the water delivery port 504, the sealing clamp ring 508 and the sealing card slot 505 are provided with the same number of groups, and the two are sealed and plugged; the cooling component here includes a circulation main pipe 601, a connecting branch pipe 602 and a capillary network 603; the circulation main pipe 601 is connected to the connecting nozzle 507, and a connecting branch pipe 602 is provided on one side of the circulation main pipe 601, and the connecting branch pipe 602 is connected to the capillary network 603.

[0024] The filtering mechanism here is arranged on one side of the supporting frame 509, and the filtering mechanism includes a loading slot 701, a supporting plate 702, a loading card plate 703, an auxiliary handle 704, a receiving slot 705 and auxiliary accessories; the loading slot 701 is arranged at a frame opening position on one side of the supporting frame 509, and a threaded groove is arranged in the loading slot 701, a loading card plate 703 is fixedly arranged at the side position of the supporting plate 702, the loading card plate 703 is stuck in the loading slot 701 and fixed by screws, an auxiliary handle 704 is fixedly arranged on the supporting plate 702, and receiving slots 705 are equidistantly arranged in the supporting plate 702, and auxiliary accessories are arranged in the receiving slots 705; wherein the supporting plate 702 corresponds to the setting position of the capillary network 603, the capillary network 603 is arranged in the middle position of the supporting frame 509, and the supporting plate 702 is arranged at one end position of the supporting frame 509.

[0025] The auxiliary accessories here include a limit slot 801, a first magnetic ring 802, an auxiliary pipe 803, a limit retaining ring 804, a second magnetic ring 805, an internal thread connection slot 806, an external thread connection ring body 807, an auxiliary cap body 808 and a filter hole body 809; the limit slot 801 is arranged at a notch position at one end of the accommodating slot body 705, a limit retaining ring 804 is fixedly arranged at one end of the auxiliary pipe 803, an internal thread connection slot 806 is arranged on the inner side wall of the other end of the auxiliary pipe 803, the internal thread connection slot 806 is threadedly connected with the external thread connection ring body 807, the external thread connection ring body 807 is fixedly arranged at one end of the auxiliary cap body 808, and the filter hole body 809 is evenly arranged in the auxiliary cap body 808. Hole body 809; wherein a first magnetic ring 802 is fixedly arranged in the limit slot 801, and a second magnetic ring 805 is fixedly arranged on one side of the limit stop ring 804, the second magnetic ring 805 and the first magnetic ring 802 are arranged at corresponding positions, the same number of groups are arranged, and the two attract each other; the auxiliary pipe fitting 803 here is placed in the accommodating slot body 705, and an auxiliary pipe fitting 803 is arranged in one accommodating slot body 705, and the pipe diameter of the auxiliary pipe fitting 803 is set equal to the slot diameter of the accommodating slot body 705; the filter hole body 809 is set to be a frustum shape, that is, the large mouth end of the filter hole body 809 is set at the inner end of the auxiliary cap body 808, and the small mouth end of the filter hole body 809 is set at the outer end of the auxiliary cap body 808.

[0026] In this embodiment, the smoke is filtered mainly by the filter mechanism, and the smoke passes through the auxiliary pipe 803 in the supporting plate body 702. An auxiliary cap body 808 is set at one end of the auxiliary pipe 803 to filter the impurity particles in the smoke. The auxiliary pipe 803 is also equivalent to a storage structure, which stores the filtered impurity particles for subsequent centralized cleaning. When the filter mechanism needs to be disassembled and cleaned later, it is only necessary to take out the supporting frame 509 from the supporting box body 42, and then take out the supporting plate body 702 from one end of the supporting frame body 509. Yes, it is easy to disassemble; when disassembling and cleaning, the auxiliary pipe fitting 803 can be taken out from the accommodating groove 705, that is, the auxiliary pipe fitting 803 can be directly pushed out with fingers or auxiliary tools, and the auxiliary pipe fitting 803 is positioned by the mutual attraction between the first magnetic ring 802 and the second magnetic ring 805; the auxiliary cap body 808 arranged at one end of the auxiliary pipe fitting 803 can also be disassembled, and the auxiliary cap body 808 is fixed by threading the external threaded connecting ring body 807 and the internal threaded connecting groove 806. Disassembling the auxiliary cap body 808 alone can make it more convenient to clean and remove impurities.

[0027] After the filter mechanism filters the flue gas, the gas passes through the capillary network 603, which provides a cooling function for the gas. The coolant enters from one of the water inlets 504, then enters from one of the connecting nozzles 507, and then enters the circulation main pipe 601. Then, it fills the capillary network 603 through the connecting branch pipe 602, and then flows out from another connecting nozzle 507, and then flows out from another cooling water pipe 503, forming a circulating cooling effect. On this basis, the capillary network 603 also has a certain filtering effect on the flue gas, and also has a filtering effect on fine dust. The capillary network 603 provides an auxiliary filtering function for the filter mechanism.

[0028] When cooling water is used in the cooling water pipe 503 for cooling, the cooling water not only cools the flue gas but also has a recovery effect on the heat absorbed by it. By absorbing the heat in the flue gas, the water with increased temperature can be used in other aspects, thereby improving resource utilization.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Induced draft fan, characterized in that: It comprises an induced draft fan main body (1), a smoke extraction port (2), a smoke exhaust port (3), a connecting pipe (4) and an auxiliary mechanism; The induced draft fan body (1) is provided with a smoke intake port (2) and a smoke exhaust port (3); A frame-shaped connecting flange (21) is fixedly provided at the connecting end of the smoking port (2), and the smoking port (2) is connected to the connecting pipe (4); frame-shaped docking flanges (41) are symmetrically fixedly provided at both ends of the connecting pipe (4), and a carrying box body (42) is provided on the connecting pipe (4); An auxiliary mechanism is provided in the carrying box body (42); The top end of the carrying box body (42) is provided with a mounting slot (43), and a threaded slot is provided in the mounting slot (43); The auxiliary mechanism comprises a loading assembly and a filtering mechanism; wherein the loading assembly comprises a mounting plate (501), a lifting handle (502), a cooling water pipe (503), a water inlet (504), a sealing slot (505), a positioning plate (506), a connecting nozzle (507), a sealing clamp ring (508), a bearing frame (509) and a cooling assembly; the top surface of the mounting plate (501) is fixedly provided with a lifting handle (502), and the mounting plate (501) is symmetrically provided with a water inlet (503). The water delivery port (504) is connected to a cooling water delivery pipe (503) at the top end of the water delivery port (504), and a sealing slot (505) is provided at the bottom end of the water delivery port (504). The positioning plate (506) is fixedly arranged at the top side of the supporting frame (509), and the positioning plate (506) is fixedly connected to the mounting card plate (501) by screws. The mounting card plate (501) is adapted to be snap-fitted with the mounting slot (43), and the mounting card plate (501) is fixed by screws.

2. The induced draft fan according to claim 1, characterized in that: A connecting nozzle (507) is provided at the top of the supporting frame (509), a sealing clamp (508) is sleeved on the connecting nozzle (507), and a cooling assembly is provided inside the supporting frame (509); the connecting nozzle (507) is adapted to be plugged in with the water delivery port (504), the sealing clamp (508) and the sealing slot (505) are provided with the same number of groups, and the two are sealed and plugged in.

3. The induced draft fan according to claim 1, characterized in that: The cooling component comprises a main circulation pipe (601), a connecting branch pipe (602) and a capillary network (603); the main circulation pipe (601) is connected to a connecting nozzle (507), and a connecting branch pipe (602) is provided on one side of the main circulation pipe (601); the connecting branch pipe (602) is connected to the capillary network (603).

4. The induced draft fan according to claim 3, characterized in that: The filtering mechanism is arranged on one side of the bearing frame (509), and comprises a loading card slot (701), a bearing plate (702), a loading card plate (703), an auxiliary handle (704), a receiving slot (705) and an auxiliary accessory; the loading card slot (701) is arranged at a frame opening position on one side of the bearing frame (509), and a threaded groove is arranged in the loading card slot (701), a loading card plate (703) is fixedly arranged at a side position of the bearing plate (702), the loading card plate (703) is clamped in the loading card slot (701) and fixed by screws, an auxiliary handle (704) is fixedly arranged on the bearing plate (702), and a receiving slot (705) is arranged equidistantly in the bearing plate (702), and an auxiliary accessory is arranged in the receiving slot (705).

5. The induced draft fan according to claim 4, characterized in that: The bearing plate body (702) and the capillary network (603) are arranged at corresponding positions. The capillary network (603) is arranged at a middle position of the bearing frame body (509), and the bearing plate body (702) is arranged at one end position of the bearing frame body (509).

6. The induced draft fan according to claim 4, characterized in that: The auxiliary accessory comprises a limit slot (801), a first magnetic ring (802), an auxiliary pipe (803), a limit retaining ring (804), a second magnetic ring (805), an internally threaded connection slot (806), an externally threaded connection ring body (807), an auxiliary cap body (808) and a filtering hole body (809); the limit slot (801) is arranged at a notch position at one end of the accommodating slot body (705); a limit retaining ring (804) is fixedly arranged at one end of the auxiliary pipe (803); an internally threaded connection slot (806) is arranged on the inner side wall of the other end of the auxiliary pipe (803); the internally threaded connection slot (806) is threadedly connected to the externally threaded connection ring body (807); the externally threaded connection ring body (807) is fixedly arranged at one end of the auxiliary cap body (808); and filtering holes (809) are evenly arranged in the auxiliary cap body (808).

7. The induced draft fan according to claim 6, characterized in that: A first magnetic ring (802) is fixedly arranged in the limit slot (801), and a second magnetic ring (805) is fixedly arranged on one side of the limit stop ring (804); the second magnetic ring (805) and the first magnetic ring (802) are arranged at corresponding positions and in the same number of groups, and the two attract each other.

8. The induced draft fan according to claim 6, characterized in that: The auxiliary pipe fitting (803) is placed in the receiving tank body (705), and one auxiliary pipe fitting (803) is arranged in one of the receiving tank bodies (705), and the pipe diameter of the auxiliary pipe fitting (803) is set equal to the diameter of the slot of the receiving tank body (705); the filtering hole body (809) is set to be a frustum, that is, the large end of the filtering hole body (809) is arranged at the inner end of the auxiliary cap body (808), and the small end of the filtering hole body (809) is arranged at the outer end of the auxiliary cap body (808).

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