Circulating fan capable of adding water below water tank

Abstract

A circulating fan capable of adding water below a water tank comprises the water tank and a circulating fan body, the circulating fan body is connected with the water tank, the water tank comprises a boss and a water tank, the boss is connected with an air inlet pipe, the air inlet pipe is provided with an internal channel and an air outlet, the water tank is connected with a top column and a valve bead top column, the valve bead top column is connected with a valve bead, and the top column is connected with a valve needle. The air inlet pipe is connected with a spring, the boss is provided with a through hole, the water tank is connected with an end cover, and the end cover is connected with a drainage module. According to the utility model, the inside of the water tank is communicated with the outside air flow through the additional arrangement of the exhaust pipe, so that the air entering the water tank is not in contact with the water body and is directly discharged into the air cavity in the water tank, thereby eliminating the grunt sound and improving the user experience, and the inside of the water tank is communicated with the outside air flow through the additional arrangement of the exhaust pipe. No regulating valve assembly or floating plate part needs to be added, the production process is simple and reliable, and water seepage in the machine body caused by failure of the regulating valve assembly or the floating plate assembly is avoided, so that the product quality is not influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of circulating fans, in particular to a circulating fan with water added under a water tank. Background Art

[0002] For an existing fan or humidifier with a humidification function, if the water tank is filled with water from the bottom, when the water tank is draining, the volume of the water tank filled with water will tend to be a vacuum state, and the internal air pressure will drop, causing some air to enter the drain port to form bubbles. When the bubbles rise, they will resonate with the water, and according to the formula pV=nRT, the water pressure becomes lower, causing the internal volume of the bubbles to increase. When the bubbles leave the water surface, they lose the tension provided by the water and burst, producing a "gurgling" noise, affecting the user experience.

[0003] If the water tank is filled with water from top, a regulating valve assembly and a floating plate part need to be added to the water tank to switch the water flow at the drain outlet. The regulating valve assembly has a complex structure and high requirements on the production process. If its quality is unstable, the water tank drain outlet may continue to drain water, causing water seepage inside the machine body, the product cannot work, and the product quality is affected. Utility Model Content

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a circulating fan with water added from the bottom of the water tank. When the water tank is drained by the bottom water adding method, some air will enter the water tank to form bubbles. When the bubbles rise, the water pressure they are subjected to becomes lower, causing the internal volume of the bubbles to become larger. When the bubbles leave the water surface, they lose the tension provided by the water and burst, producing a "gurgling" noise, which affects the user experience. If the water tank is filled with water from the top, a regulating valve assembly and a floating plate part need to be added to the water tank to switch the water flow at the drain port. The regulating valve assembly has a complex structure and high requirements on the production process. If its quality is unstable, it is easy for the water tank drain port to continue to drain water, resulting in water seepage inside the fuselage, the product cannot work, and the product quality is affected.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a circulating fan for adding water under a water tank, comprising a water tank and a circulating fan, the circulating fan being connected to the water tank, the water tank comprising a boss and a water trough, the boss being connected to an air inlet pipe, the air inlet pipe being provided with an internal passage and an air outlet, the water trough being connected to a top column and a valve ball top column, the valve ball top column being connected to a valve ball, the top column being connected to a valve needle, the air inlet pipe being connected to a spring, the boss being provided with a through hole, the water tank being connected to an end cover, and the end cover being connected to a drainage module.

[0006] As a further improvement of the utility model: a sealing ring is inserted into the limiting groove in the end cover.

[0007] As a further improvement of the utility model: the spring is assembled to the limiting rib in the air intake pipe.

[0008] As a further improvement of the utility model: the drainage module is provided with a drainage hole.

[0009] As a further improvement of the present invention: the diameter of the internal channel is 4.5MM.

[0010] As a further improvement of the utility model: the air intake pipe is provided with an air intake pipe screw hole, the end cover is provided with an end cover screw column, and the air intake pipe screw hole and the end cover screw column are fixedly connected by screws.

[0011] As a further improvement of the utility model: the water tank is provided with a water tank screw hole, and the end cover screw column is fixedly connected to the water tank screw hole by screws.

[0012] As a further improvement of the present invention: the diameter of the drainage hole is 2MM.

[0013] As a further improvement of the utility model: the drainage module is provided with an external thread, the end cover is provided with an internal thread, and the external thread is screwed into the internal thread.

[0014] As a further improvement of the utility model: the valve ball is placed on the inclined surface inside the end cover, and the sealing gasket of the drainage module is tightly attached to the end surface of the end cover.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model provides a design scheme for controlling the water adding under the water tank, by adding an exhaust pipe so that the inside of the water tank is connected with the external airflow, and by utilizing the principle of water pressure difference, an air intake and water discharge circulation flow system is formed inside the water tank, so that the gas entering the water tank does not contact with the water body, but is directly discharged into the air cavity inside the water tank, thereby eliminating the "gurgling sound" and improving the user experience. By adding an exhaust pipe so that the inside of the water tank is connected with the external airflow, there is no need to add a regulating valve assembly and a floating plate part, the production process is simple and reliable, and the failure of the regulating valve assembly or the floating plate assembly will not cause water seepage inside the fuselage, thereby affecting the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 2 It is a cross-sectional structural schematic diagram of the utility model;

[0019] Figure 3 This is a schematic diagram of the exploded structure of the water tank of the utility model;

[0020] Figure 4It is a schematic diagram of the structure of the water tank part of the utility model;

[0021] Figure 5 This is a schematic diagram of the air intake pipe structure of the utility model;

[0022] Figure 6 This is a schematic diagram of the valve ball structure of the utility model;

[0023] Figure 7 It is a schematic diagram of the spring structure of the utility model;

[0024] Figure 8 This is a schematic diagram of the sealing ring structure of the utility model;

[0025] Fig. 9 This is a schematic diagram of the structure of the end cover of the utility model;

[0026] Fig.10 This is a schematic diagram of the cross-sectional structure of the drainage module of the utility model;

[0027] In the figure: 1. water tank; 2. air inlet pipe; 3. valve ball; 4. spring; 5. sealing ring; 6. end cover; 7. drainage module; 8. water tank; 11. boss; 13. through hole; 15. water tank screw hole; 21. internal channel; 22. air outlet; 23. limiting rib; 24. air inlet pipe screw hole; 61. limiting groove; 62. end cover screw column; 63. inclined surface; 65. internal thread; 66. end face; 73. drainage hole; 74. valve needle; 75. external thread; 76. sealing gasket; 81. water tank; 82. top column; 83. valve ball top column. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model and the corresponding drawings. 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.

[0029] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0031] The utility model is further described in conjunction with the accompanying drawings and embodiments: Figure 1-10 A circulating fan for adding water under a water tank is shown, comprising a water tank 1 and a circulating fan, wherein the circulating fan is connected to the water tank 1, the water tank 1 comprises a boss 11 and a water trough 8, the boss 11 is connected to an air inlet pipe 2, the air inlet pipe 2 is provided with an internal channel 21 and an air outlet 22, the water trough 8 is connected to a top column 82 and a valve ball top column 83, the valve ball top column 83 is connected to a valve ball 3, the top column 82 is connected to a valve needle 74, the air inlet pipe 2 is connected to a spring 4, the boss 11 is provided with a through hole 13, the water tank 1 is connected to an end cover 6, and the end cover 6 is connected to a drainage module 7.

[0032] As a preferred embodiment, the limiting groove 61 in the end cover 6 is inserted into the sealing ring 5 .

[0033] As a preferred embodiment, the spring 4 is assembled to the limiting rib 23 in the intake pipe 2 .

[0034] As a preferred embodiment, the drainage module 7 is provided with a drainage hole 73 .

[0035] As a preferred embodiment, the diameter of the internal channel 21 is 4.5MM.

[0036] As a preferred embodiment, the air intake pipe 2 is provided with an air intake pipe screw hole 24, and the end cover 6 is provided with an end cover screw column 62, and the air intake pipe screw hole 24 is fixedly connected with the end cover screw column 62 by screws.

[0037] As a preferred embodiment, the water tank 1 is provided with a water tank screw hole 15, and the end cover screw column 62 is fixedly connected to the water tank screw hole 15 by screws.

[0038] As a preferred embodiment, the diameter of the drainage hole 73 is 2MM.

[0039] As a preferred embodiment, the drainage module 7 is provided with an external thread 75 , the end cover 6 is provided with an internal thread 65 , and the external thread 75 is screwed into the internal thread 65 .

[0040] As a preferred embodiment, the valve ball 3 is placed on the inclined surface 63 inside the end cover 6 , and the sealing gasket 76 of the drainage module 7 is in close contact with the end surface 66 of the end cover 6 .

[0041] The working principle of this utility model:

[0042] The utility model provides a design scheme for controlling the water adding under the water tank, by adding an exhaust pipe so that the inside of the water tank is connected with the external airflow, and by utilizing the principle of water pressure difference, an air intake and water discharge circulation flow system is formed inside the water tank, so that the gas entering the water tank does not contact with the water body, but is directly discharged into the air cavity inside the water tank, thereby eliminating the "gurgling sound" and improving the user experience. By adding an exhaust pipe so that the inside of the water tank is connected with the external airflow, there is no need to add a regulating valve assembly and a floating plate part, the production process is simple and reliable, and the failure of the regulating valve assembly or the floating plate assembly will not cause water seepage inside the fuselage, thereby affecting the product quality.

[0043] Implementation case 1:

[0044] like Figure 1-10 A circulating fan for adding water under a water tank is shown, comprising a water tank 1 and a circulating fan, wherein the circulating fan is connected to the water tank 1, the water tank 1 comprises a boss 11 and a water trough 8, the boss 11 is connected to an air inlet pipe 2, the air inlet pipe 2 is provided with an internal channel 21 and an air outlet 22, the water trough 8 is connected to a top column 82 and a valve ball top column 83, the valve ball top column 83 is connected to a valve ball 3, the top column 82 is connected to a valve needle 74, the air inlet pipe 2 is connected to a spring 4, the boss 11 is provided with a through hole 13, the water tank 1 is connected to an end cover 6, and the end cover 6 is connected to a drainage module 7.

[0045] The limiting groove 61 in the end cover 6 is inserted into the sealing ring 5, the spring 4 is assembled to the limiting rib 23 in the intake pipe 2, the drainage module 7 is provided with a drainage hole 73, the diameter of the internal channel 21 is 4.5MM, the intake pipe 2 is provided with an intake pipe screw hole 24, the end cover 6 is provided with an end cover screw column 62, the intake pipe screw hole 24 and the end cover screw column 62 are fixedly connected by screws, the water tank 1 is provided with a water tank screw hole 15, the end cover screw column 62 and the water tank screw hole 15 are fixedly connected by screws, the diameter of the drainage hole 73 is 2MM, the drainage module 7 is provided with an external thread 75, the end cover 6 is provided with an internal thread 65, the external thread 75 is screwed into the internal thread 65, the valve ball 3 is placed on the inclined surface 63 in the end cover 6, and the sealing gasket 76 of the drainage module 7 is close to the end face 66 of the end cover 6.

[0046] In this embodiment, the sealing ring 5 is first inserted into the limiting groove 61 in the end cover 6, and then the spring 4 is assembled to the limiting rib 23 in the air intake pipe 2, and the valve ball 3 is placed on the inclined surface 63 in the end cover 6, and then the screw hole 24 in the air intake pipe 2 is fixedly connected to the screw column 67 in the end cover 6 by screwing. Under the action of the spring 4, the valve ball 3 will be sealed and tightly attached to the inclined surface 63 in the end cover 6, thereby achieving the fixation of the valve ball 3 and the spring 4. Then, the external thread 75 in the drainage module 7 is screwed into the internal thread 65 in the end cover 6, and the sealing gasket 76 on the drainage module 7 is sealed and tightly attached to the end surface 66 on the end cover 6, and finally the screw column 62 in the end cover 6 is fixed to the screw hole 15 in the water tank 1 by screwing, thereby completing the assembly of the water tank assembly.

[0047] Implementation case 2:

[0048] like Figure 1-10 A circulating fan for adding water under a water tank is shown, comprising a water tank 1 and a circulating fan, wherein the circulating fan is connected to the water tank 1, the water tank 1 comprises a boss 11 and a water trough 8, the boss 11 is connected to an air inlet pipe 2, the air inlet pipe 2 is provided with an internal channel 21 and an air outlet 22, the water trough 8 is connected to a top column 82 and a valve ball top column 83, the valve ball top column 83 is connected to a valve ball 3, the top column 82 is connected to a valve needle 74, the air inlet pipe 2 is connected to a spring 4, the boss 11 is provided with a through hole 13, the water tank 1 is connected to an end cover 6, and the end cover 6 is connected to a drainage module 7.

[0049] The limiting groove 61 in the end cover 6 is inserted into the sealing ring 5, the spring 4 is assembled to the limiting rib 23 in the intake pipe 2, the drainage module 7 is provided with a drainage hole 73, the diameter of the internal channel 21 is 4.5MM, the intake pipe 2 is provided with an intake pipe screw hole 24, the end cover 6 is provided with an end cover screw column 62, the intake pipe screw hole 24 and the end cover screw column 62 are fixedly connected by screws, the water tank 1 is provided with a water tank screw hole 15, the end cover screw column 62 and the water tank screw hole 15 are fixedly connected by screws, the diameter of the drainage hole 73 is 2MM, the drainage module 7 is provided with an external thread 75, the end cover 6 is provided with an internal thread 65, the external thread 75 is screwed into the internal thread 65, the valve ball 3 is placed on the inclined surface 63 in the end cover 6, and the sealing gasket 76 of the drainage module 7 is close to the end face 66 of the end cover 6.

[0050] When the user adds water to the water tank 1, the drainage module 7 needs to be removed first, and then water can be added to the water tank 1. When the water tank 1 is placed on the fuselage after being filled with water, the water level of the water tank 1 will be lower than the boss 11 on the water tank 1, so that the air outlet 22 in the air inlet pipe 2 is exposed above the water surface. At the same time, the top columns 82 and 83 in the water tank 8 will simultaneously push out the valve needle 74 and the valve ball 3, and the water tank 1 is provided with a through hole 13 connected to the outside, so that the internal channel 21 of the air inlet pipe 2, the internal channel size of the air inlet pipe 2 is ф4.5mm in diameter, is also connected to the external airflow, so that the gas enters the water tank 1. At the same time, the water inside the water tank 1 will pass through the drainage hole 73 in the drainage module 7, the size of the drainage hole 73 is ф2mm in diameter, and flow into the water tank 8 until the water level in the water tank 8 reaches the end surface 66 in the end cover 6 to seal the air inlet pipe 2. At this time, the interior of the air inlet pipe 2 is no longer connected to the external airflow, and a communicating vessel will be formed inside the water tank 1. Under the action of atmospheric pressure, the water in the water tank 8 will be sucked into the interior of the air inlet pipe 2, and the water level inside the air inlet pipe 2 will be level with the water level in the water tank 1, and at the same time, the water tank 1 will stop draining water into the water tank 8.

[0051] Implementation case three:

[0052] like Figure 1-10 A circulating fan for adding water under a water tank is shown, comprising a water tank 1 and a circulating fan, wherein the circulating fan is connected to the water tank 1, the water tank 1 comprises a boss 11 and a water trough 8, the boss 11 is connected to an air inlet pipe 2, the air inlet pipe 2 is provided with an internal channel 21 and an air outlet 22, the water trough 8 is connected to a top column 82 and a valve ball top column 83, the valve ball top column 83 is connected to a valve ball 3, the top column 82 is connected to a valve needle 74, the air inlet pipe 2 is connected to a spring 4, the boss 11 is provided with a through hole 13, the water tank 1 is connected to an end cover 6, and the end cover 6 is connected to a drainage module 7.

[0053] The limiting groove 61 in the end cover 6 is inserted into the sealing ring 5, the spring 4 is assembled to the limiting rib 23 in the intake pipe 2, the drainage module 7 is provided with a drainage hole 73, the diameter of the internal channel 21 is 4.5MM, the intake pipe 2 is provided with an intake pipe screw hole 24, the end cover 6 is provided with an end cover screw column 62, the intake pipe screw hole 24 and the end cover screw column 62 are fixedly connected by screws, the water tank 1 is provided with a water tank screw hole 15, the end cover screw column 62 and the water tank screw hole 15 are fixedly connected by screws, the diameter of the drainage hole 73 is 2MM, the drainage module 7 is provided with an external thread 75, the end cover 6 is provided with an internal thread 65, the external thread 75 is screwed into the internal thread 65, the valve ball 3 is placed on the inclined surface 63 in the end cover 6, and the sealing gasket 76 of the drainage module 7 is close to the end face 66 of the end cover 6.

[0054] In this embodiment, when the user starts the humidification function, the water in the water tank 8 gradually decreases while the atomizer continues to work. When the water level in the water tank 8 drops to a certain level, the adhesion formed by the surface tension of the water near the end face 66 becomes invalid. At this time, the inside of the air intake pipe 2 will be connected to the external air flow again, so that the gas will continue to enter the inside of the air intake pipe 2 and push the liquid inside the air intake pipe 2 to spray out. When the liquid passes through the multiple micropores with a diameter of 1 mm in the air intake pipe 2, it will be divided into multiple small water columns, resulting in a deceleration process, and then tilted to fall on the inner wall of the side of the water tank 1 to prevent noise. When the liquid in the air intake pipe is separated from the air intake pipe 2, the air intake pipe 2 will discharge the gas again, and the gas will be released into the cavity inside the water tank 1 without passing through the water surface, so no noise will be generated. At the same time, when there is a pressure difference between the air intake pipe 2 and the drainage module 7, according to P=ρGh, the drainage module 7 will drain water into the water tank 8 again.

[0055] Implementation Case 4:

[0056] like Figure 1-10 A circulating fan for adding water under a water tank is shown, comprising a water tank 1 and a circulating fan, wherein the circulating fan is connected to the water tank 1, the water tank 1 comprises a boss 11 and a water trough 8, the boss 11 is connected to an air inlet pipe 2, the air inlet pipe 2 is provided with an internal channel 21 and an air outlet 22, the water trough 8 is connected to a top column 82 and a valve ball top column 83, the valve ball top column 83 is connected to a valve ball 3, the top column 82 is connected to a valve needle 74, the air inlet pipe 2 is connected to a spring 4, the boss 11 is provided with a through hole 13, the water tank 1 is connected to an end cover 6, and the end cover 6 is connected to a drainage module 7.

[0057] The limiting groove 61 in the end cover 6 is inserted into the sealing ring 5, the spring 4 is assembled to the limiting rib 23 in the intake pipe 2, the drainage module 7 is provided with a drainage hole 73, the diameter of the internal channel 21 is 4.5MM, the intake pipe 2 is provided with an intake pipe screw hole 24, the end cover 6 is provided with an end cover screw column 62, the intake pipe screw hole 24 and the end cover screw column 62 are fixedly connected by screws, the water tank 1 is provided with a water tank screw hole 15, the end cover screw column 62 and the water tank screw hole 15 are fixedly connected by screws, the diameter of the drainage hole 73 is 2MM, the drainage module 7 is provided with an external thread 75, the end cover 6 is provided with an internal thread 65, the external thread 75 is screwed into the internal thread 65, the valve ball 3 is placed on the inclined surface 63 in the end cover 6, and the sealing gasket 76 of the drainage module 7 is close to the end face 66 of the end cover 6.

[0058] In this embodiment, when the water tank 1 drains water until the water level in the water tank 8 reaches the end surface 66, a communicating vessel is formed again inside the water tank. Under the action of atmospheric pressure, the water in the water tank will be sucked into the air inlet pipe 2 again, and the water level inside the air inlet pipe 2 will be level with the water level in the water tank. This whole process will be repeated until there is no water in the water tank.

[0059] The main functions of this utility model:

[0060] The utility model provides a design scheme for controlling the water adding under the water tank, by adding an exhaust pipe so that the inside of the water tank is connected with the external airflow, and by utilizing the principle of water pressure difference, an air intake and water discharge circulation flow system is formed inside the water tank, so that the gas entering the water tank does not contact with the water body, but is directly discharged into the air cavity inside the water tank, thereby eliminating the "gurgling sound" and improving the user experience. By adding an exhaust pipe so that the inside of the water tank is connected with the external airflow, there is no need to add a regulating valve assembly and a floating plate part, the production process is simple and reliable, and the failure of the regulating valve assembly or the floating plate assembly will not cause water seepage inside the fuselage, thereby affecting the product quality.

[0061] In summary, after reading the utility model document, ordinary technicians in this field can make various other corresponding transformation schemes based on the technical scheme and technical concept of the utility model without creative mental labor, which all fall within the scope of protection of the utility model.

[0062] In the description of the present utility model, it needs to be understood that the orientations or positional relationships indicated by terms such as "upper end face", "lower end face", "top", "bottom", "left" and "right" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present utility model. Therefore, they cannot be understood as limitations on the actual use direction of the present utility model.

[0063] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and should all be included in the scope of the claims and specification of the present invention.

Claims

1. A circulating fan with water added under a water tank, characterized in that: It includes a water tank and a circulation fan, the circulation fan is connected to the water tank, the water tank includes a boss and a water tank, the boss is connected to the air inlet pipe, the air inlet pipe is provided with an internal channel and an air outlet, the water tank is connected to the top column and the valve ball top column, the valve ball top column is connected to the valve ball, the top column is connected to the valve needle, the air inlet pipe is connected to the spring, the boss is provided with a through hole, the water tank is connected to the end cover, and the end cover is connected to the drainage module.

2. A circulating fan with water added under the water tank according to claim 1, characterized in that: The limiting groove in the end cover is sleeved with a sealing ring.

3. A circulating fan with water added under the water tank according to claim 1, characterized in that: The spring is assembled to the limiting rib in the air intake pipe.

4. A circulating fan with water added under a water tank according to claim 1, characterized in that: The drainage module is provided with a drainage hole.

5. A circulating fan with water added under the water tank according to claim 1, characterized in that: The diameter of the internal channel is 4.5MM.

6. A circulating fan with water added under the water tank according to claim 1, characterized in that: The air intake pipe is provided with an air intake pipe screw hole, and the end cover is provided with an end cover screw column, and the air intake pipe screw hole and the end cover screw column are fixedly connected by screws.

7. A circulating fan with water added under the water tank according to claim 5, characterized in that: The water tank is provided with a water tank screw hole, and the end cover screw column is fixedly connected with the water tank screw hole by screws.

8. A circulating fan with water added under a water tank according to claim 4, characterized in that: The diameter of the drainage hole is 2MM.

9. A circulating fan with water added under a water tank according to claim 1, characterized in that: The drainage module is provided with an external thread, and the end cover is provided with an internal thread, and the external thread is screwed into the internal thread.

10. A circulating fan with water added under a water tank according to claim 1, characterized in that: The valve ball is placed on the inclined surface inside the end cover, and the sealing gasket of the drainage module is tightly attached to the end surface of the end cover.

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