A water-saving washing machine water-passing device

Abstract

The present invention discloses a water-saving washing machine water-flow device, which relates to the technical field of water-saving washing machines, and overcomes the defect of poor drainage of existing water-saving washing machines. The water-flow device comprises a water-flow inlet arranged on a rotating body, and is characterized in that: the water-flow inlet can be rotatably inserted into an upper water seal through the rotating body, the upper water seal is fixedly mounted on an upper shell body, the upper shell body is connected to a hollow lower shell body provided with a drainage port, and a positioning ring fixedly sealed and connected to a deceleration clutch of the washing machine is arranged in the middle of the lower part of the lower shell body; the water-flow device is an independent whole, and is provided with a shape that is matched and connected with an inner barrel, an outer barrel and a clutch of the washing machine and is installed on the washing machine; the product of the present invention can not only be arranged as an independent module to match with the inner barrel and the clutch of the washing machine, but can also be combined with the inner barrel or the clutch into a combination and then installed on the washing machine, which can quickly drain water, save time, and improve the use efficiency of the water-saving washing machine.

Description

Technical Field

[0001] The invention relates to the technical field of water-saving washing machines, and in particular to a water-passing device of a water-saving washing machine. Background Art

[0002] The current water-saving washing machines have very small drainage outlets, which not only causes poor drainage, but also causes the washing machine to be unable to drain due to blockage by dirt. How to set up a drainage device to drain water quickly and conveniently is a technical problem that we urgently need to solve.

[0003] In order to solve the water-saving and secondary pollution problems of fully automatic pulsator or drum washing machines, the industry has developed environmentally friendly washing machines, namely, hole-free washing drum washing machines. For example, the lower part of the inner drum of a pulsator washing machine is an integral design, and there is a circle of water-spraying holes only in the part of the barrel wall close to the balance ring, and there are no holes in other parts. During the washing process of this structure, the inner drum is filled with water, but there is no water between the inner drum and the casing, which can solve the problems of water-saving and secondary pollution.

[0004] Patent application JP07250989A discloses a dehydration washing machine, a washing machine / dehydration barrel (hereinafter referred to as inner barrel) with a pulsator rotatably mounted at the center of the bottom, the inner barrel rotatably mounted inside the outer barrel, the pulsator connected to the deceleration clutch through the washing shaft, the inner barrel assembled and connected to the washing shaft through the dehydration shaft, a coupling assembly is assembled on the inner barrel and the dehydration shaft, a vertical drainage hole is arranged on the coupling assembly, a sealing receiver is arranged at a position corresponding to the drainage hole below the coupling assembly, a water seal is arranged at the connection between the sealing receiver and the coupling assembly, the lower end of the sealing receiver is arranged on the upper surface of the bottom of the outer barrel, a sealing gasket is arranged at the connection between the sealing receiver and the bottom of the outer barrel, and a drainage port connected to the sealing receiver is arranged on the bottom of the outer barrel. This scheme discloses a washing barrel with no holes in the inner barrel, by arranging a coupling assembly at the bottom of the inner barrel to connect a sealing receiver and the inner barrel, and arranging a drainage hole on the coupling assembly, so as to realize the connection between the washing water in the inner barrel and the sealing receiver.

[0005] However, in this solution, there are the following technical problems:

[0006] .The connecting piece is connected to the upper sleeve and flange of the clutch. The diameter of the drainage hole set on the connecting piece must be much smaller than the distance between the end of the sealing receiver and the upper sleeve of the clutch, resulting in a very small flow area of ​​the drainage hole, which is easily blocked by hair or washing during the washing process.

[0007] During the assembly process, it is difficult to ensure the same coaxiality between the water seal and the coupling at the connection between the sealing receiver and the coupling. Although it is theoretically feasible, it is easy to cause mechanical wear during use, which may lead to failure of the seal of the water seal due to wear and tear, causing water leakage.

[0008] In order to increase the drainage efficiency of washing water, thereby increasing the diameter of the connecting piece and expanding the diameter of the drainage hole, it is necessary to increase the size of the oil seal set at the connection between the sealing receiver and the connecting piece. However, in actual application, the larger the size of the oil seal there is, the easier it is to leak.

[0009] In this solution, the sealing receiver is arranged at the upper part of the bottom of the outer cylinder, so that the height difference between the inner cylinder and the outer cylinder has to be increased, which makes a large change to the assembly of the whole machine, which is not conducive to the actual production application. In addition, raising the height of the inner cylinder is not conducive to the stability of the connection of the inner cylinder.

[0010] How to increase the drainage volume of washing water when the outer diameter of the water seal at the connecting parts is the same is an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0011] The purpose of the present invention is to provide a water-saving washing machine water-passing device, by arranging a drainage device between the washing machine rotating body and the washing machine deceleration clutch, to quickly drain water and improve the use efficiency of the water-saving washing machine.

[0012] According to the above purpose, the technical solution of the present invention is: a water-saving washing machine water flow device, including a water flow inlet arranged on a rotating body, characterized in that: the water flow inlet can be rotatably inserted into the upper water seal through the rotating body, the upper water seal is fixedly installed on the upper shell body, the upper shell body is connected to the hollow lower shell body with a drain outlet, and the lower middle part of the lower shell body is provided with a positioning ring fixedly sealed and connected to the washing machine deceleration clutch.

[0013] The water-passing device is an independent whole, and is arranged on the washing machine in a shape that is matched and connected with the inner barrel, the outer barrel and the clutch of the washing machine.

[0014] The water-passing device is matched with the clutch or the outer tub to form an assembly, which is assembled and connected with the washing machine as a whole.

[0015] The rotating body is a flange of the inner drum of the washing machine or a steel bowl connected to the flange of the inner drum of the washing machine. The outer wall of the flange of the inner drum of the washing machine or the steel bowl is rotatably sealed with the inner lip of the upper water seal 1.

[0016] The fixed seal is a large water seal outer lip of a washing machine deceleration clutch, and the outer lip is a concave U-shaped groove.

[0017] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows: the product of the present invention, by arranging a drainage device between the rotating body of the washing machine and the deceleration clutch of the washing machine, can not only be arranged as an independent module to cooperate with the inner barrel and the clutch of the washing machine, but can also be combined with the outer barrel or the clutch into a combination and then installed on the washing machine, which can quickly drain water, save time, and improve the use efficiency of the water-saving washing machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work:

[0019] Figure 1 It is a cross-sectional structural schematic diagram of an embodiment of a water-saving washing machine water-passing device of the present invention;

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the water-saving washing machine water-passing device of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of the water-saving washing machine water-passing device of the present invention installed on the washing machine;

[0022] Figure 4 It is a sectional view of the three-dimensional structure of the water passing device of the present invention;

[0023] Figure 5 This is a schematic diagram of the specific structure of the water-passing device of the present invention installed on a washing machine;

[0024] Among them: 1. Upper water seal; 101. Positioning port; 102. Notch; 103. First convex part; 104. Second convex part; 2. Upper shell; 201. First connecting wall; 202. Second connecting wall; 203. Third connecting wall; 204. Middle through hole; 205. Fourth connecting wall; 3. Lower shell; 301. First connecting edge; 302. Step surface; 303. Second connecting edge; 304. Third connecting edge; 305. Fourth connecting edge; 306. Fifth connecting edge; 307. Sixth connecting edge; 4. Positioning ring; 5. Drainage port; 6. Inner barrel; 7. Flange; 8. Steel bowl; 9. Outer barrel; 10. Speed ​​reduction clutch; 11. Water flow cavity; 12. Positioning hole; 13. Drainage part; First accommodating wall; 1302. Second accommodating wall; 1303. Third accommodating wall; 1304. Fourth containment wall; 14. impeller; 15. flange drain hole; 16. water bowl; 17. circulation part. DETAILED DESCRIPTION

[0025] Embodiment 1, combination Figure 1, is a schematic diagram of the structure of an embodiment of a water-saving washing machine water-passing device of the present invention, which includes a water-passing inlet arranged on a rotating body, the water-passing inlet can be rotatably inserted into an upper water seal 1 through a rotating body, the upper water seal 1 is fixedly mounted on an upper shell 2, the upper shell 2 is connected to a hollow lower shell 3 provided with a drain port 5, and a positioning ring 4 fixedly sealed and connected to a deceleration clutch of the washing machine is provided in the middle of the lower part of the lower shell 3; the water-passing device is an independent whole, and is provided with a shape mounting member that cooperates with an inner barrel 6, an outer barrel 9 and a clutch 10 of the washing machine. On the washing machine; or, it is also possible that the water flow device is combined with the clutch 10 or the outer barrel 9 to form an assembly, which is assembled and connected to the washing machine as a whole; the rotating body is the inner barrel flange 7 of the washing machine or the steel bowl 8 connected to the inner barrel flange 7 of the washing machine, and the outer wall of the inner barrel flange 7 or the steel bowl 8 of the washing machine is rotationally sealed with the inner lip of the upper water seal 1; the fixed seal is the large water seal outer lip of the washing machine deceleration clutch 10, and the outer lip is a concave U-shaped groove, which plays a positioning and water sealing role; an annular sealing space is formed between the upper shell 2 and the upper water seal 1 and the lower shell 3 and the large water seal of the clutch 10, the upper part of which can be rotationally sealed with the steel bowl 8, and the lower part can be rotationally sealed with the upper sleeve of the clutch 10, thereby forming a water flow device with one end rotating and the other end fixed.

[0026] Embodiment 2:

[0027] like Figures 1-2 As shown, the present invention discloses a water-saving washing machine water-flow device, the water-flow device comprises a water-flow inlet arranged on a rotating body, the water-flow inlet is rotatably inserted into an upper water seal 1 through the rotating body, the upper water seal 1 is fixedly mounted on an upper shell 2, the upper shell 2 is connected to a hollow lower shell 3 provided with a drain port 5, the drain port 5 is connected to a drain pipeline, and a positioning ring 4 fixedly sealed and connected to a deceleration clutch of the washing machine is provided in the middle of the lower part of the lower shell 3.

[0028] The water flow device described in the present invention is an independent entity, and the water flow device is installed on the washing machine through a shape that cooperates with the inner drum 6, the outer drum 9 and the clutch 10 of the washing machine; or, the water flow device can also be combined with the clutch 10 or the outer drum 9 to form an assembly, which is assembled and connected to the washing machine as a whole; the washing water of the washing machine flows into the hollow space formed by the upper shell 2 and the lower shell 3 through the water flow inlet. In the washing state, the drain port 5 is connected to the drainage management, the drainage pipeline is closed, and the washing water is stored in the inner drum and fills the entire space of the water flow device; when draining, the drainage pipeline is opened, and the washing water flows into the drainage pipeline through the drain port 5, and then flows out of the washing machine through the drainage pipeline; when drying, the inner drum and the impeller rotate at high speed, and the water flow device is relatively stationary. The water flow device ensures the sealing of the water inlet of the water flow device under the washing and drying conditions through the upper water seal.

[0029] Preferably, as some embodiments of the present invention, a receiving groove is provided on the upper shell body 2, and the upper water seal 1 is arranged in the space of the receiving groove. A positioning port 101 is formed on the other side of the upper water seal 1, and the positioning port 101 contacts the water inlet of the rotating body and can rotate relatively.

[0030] Furthermore, a notch 102 is formed inside the upper water seal 1, which further ensures the sealing performance of the upper water seal to the water inlet of the water flow device during washing and drying.

[0031] Furthermore, the upper water seal 1 is formed with one or more protrusions on one side of the positioning opening 101. As some embodiments of the present invention, it includes a first protrusion and a second protrusion. This arrangement further improves the sealing performance of the contact connection between the upper water seal 1 and the rotating body, thereby improving the reliability of the present invention during use.

[0032] Preferably, the upper shell 2 includes a first connecting wall 201, a second connecting wall 202, a third connecting wall 203, and a fourth connecting wall 205. The second connecting wall 202 is arranged on one side of the first connecting wall 201. The first connecting wall 201 and the second connecting wall 202 form a receiving groove that can accommodate the upper water seal 1. A middle through hole 204 is formed in the middle part of the first connecting wall 201. The middle through hole 204 is configured to be assembled and connected with the deceleration clutch and the water inlet of the rotating body. The third connecting wall 203 is arranged on the other side of the first connecting wall 201. The other end of the third connecting wall 203 is connected to the fourth connecting wall 205. The third connecting wall 203 and the fourth connecting wall 205 are assembled with the lower shell 3 or the fourth connecting wall 205 is assembled with the lower shell 3.

[0033] Furthermore, the lower shell 3 is formed with a step surface 302 at the assembly position with the upper shell 2 , and this arrangement further ensures the reliability and sealing of the connection between the upper shell 2 and the lower shell 3 .

[0034] Furthermore, the bottom edge of the lower shell 3 has a tendency to be concave upward from both sides to the center, and the positioning ring 4 is arranged in the middle of the lower part of the lower shell 3. The lower plane elevation of the positioning ring 4 is not lower than the lowest elevation of the lower shell 3. This arrangement ensures the assembly between the inner drum, outer drum and clutch of the washing machine on the one hand. The lowest point of the lower shell 3 is supported by the large plate of the deceleration clutch 10, and a lower water seal is arranged between the large plate, the positioning ring 4 and the outer sleeve of the clutch. A water flow chamber 11 is formed between the hollow structure of the lower water seal, the positioning ring 4, the lower shell 3, and the upper shell 2 and the outer sleeve of the clutch. The water flow chamber 11 is connected to the water inlet on the rotating body. This arrangement facilitates the supporting effect of the large plate on the water flow device, ensures the stability of the placement of the water flow device, and improves the sealing and reliability of the connection between the water flow device and the outer sleeve of the clutch.

[0035] Specifically, the lower shell 3 includes a first connecting edge 301 and a second connecting edge 303, the second connecting edge 303 is arranged below the first connecting edge 301, the second connecting edge 303 and the first connecting edge 301 form a step surface 302 at the connection, the step surface 302 is used to cooperate to support the upper shell 2, the other end of the second connecting edge 303 is connected to the third connecting edge 304, the second connecting edge 303 and the third connecting edge 304 are configured to be supported by a large plate at the connection, therefore, the shape of the second connecting edge 303 and the third connecting edge 304 at the connection is coordinated with the shape of the large plate, preferably, the connection between the second connecting edge 303 and the third connecting edge 304 is horizontally arranged; the third connecting edge 304 is arranged with an upward tilting trend, the other end of the third connecting edge 304 is connected to the fourth connecting edge 305, and the fourth connecting edge 305 is fixedly connected to the positioning ring 4.

[0036] Preferably, the center axis of the positioning ring 4 is arranged to be colinear with the center axis of the water flow chamber 11, a positioning hole 12 is formed on the inner side of the positioning ring 4, the clutch outer sleeve of the deceleration clutch 10 passes through the positioning hole 12, and a lower water seal is arranged on the lower shell 3, the positioning ring 4 and the clutch outer sleeve, so that the clutch outer sleeve and the lower part of the water flow chamber 11 form a sealing structure, so that the water in the water flow chamber can only be discharged to the drainage pipe through the drain port 5. As some embodiments of the present invention, the fourth connecting edge 305 is horizontally arranged, the positioning ring 4 and the fourth connecting edge 305 are vertically arranged, and the lower plane elevation of the positioning ring 4 is higher than the lowest elevation of the second connecting edge 303 and the third connecting edge 304 at the connection. On the one hand, this arrangement facilitates the assembly of the water passing device, and on the other hand, it also ensures the stability and reliability of the water flow of the water passing device.

[0037] Preferably, the drain port 5 is formed on the lower shell 3 , and the drain port 5 is formed on a side away from the positioning ring 4 . The drain port 5 is formed at the lowest structural position of the water flow chamber 11 .

[0038] As some embodiments of the present invention, the lower shell 3 forms a circulation portion 17 and a drainage portion 13 at the position of the drainage port, and the cross-sectional area of ​​the drainage portion 13 is larger than the cross-sectional area of ​​the circulation portion 17. This arrangement facilitates the discharge of washing water and effectively improves the discharge efficiency.

[0039] Specifically, the circulation portion 17 includes a fifth connection edge 306 and a sixth connection edge 307 forming the water flow cavity 11. The fifth connection edge 306 is assembled and connected with the upper shell 2. The sixth connection edge 307 It is connected with the positioning ring 4 to form a circulation portion 17 in the space between the fifth connecting edge 306 and the sixth connecting edge 307. The circulation portion 17 is connected to the drainage portion 13. The drainage portion 13 includes a first containing wall 1301 and a third containing wall 1303. The first containing wall 1301 is connected to the fifth connecting edge 306, and the other end of the first containing wall 1301 is connected to the second containing wall 1302; the third containing wall 1303 is fixedly connected to the sixth connecting edge 307, and the other end of the third containing wall 1303 is fixedly connected to the fourth containing wall 1304. The drain port 5 is formed at the end of the second containing wall 1302 and the fourth containing wall 1304. As some embodiments of the present invention, the length of the first containing wall 1301 is greater than the length of the third containing wall 1303. This arrangement facilitates the discharge of washing water in the inner drum 6 and the water flow cavity 11.

[0040] As some embodiments of the present invention, Figure 3 As shown, the rotating body is a steel bowl 8 configured to be in contact with the upper water seal 1, the steel bowl 8 is detachably connected to the flange 7, the flange 7 is arranged at the bottom of the inner drum 6 and fixedly connected to the inner drum 6, the flange 7 is fixedly connected to the clutch outer sleeve, and a flange drain hole 15 is arranged on the flange 7. The flange 7, the clutch outer sleeve, and the steel bowl 8 form a water inlet cavity, and the water inlet cavity is connected to the water flow cavity 11, so that the washing water in the inner drum 6 can flow into the water flow cavity 11 through the water inlet cavity.

[0041] Preferably, the height of the flange 7 at the connection with the clutch outer sleeve is higher than the height of the upper plane of the bottom of the inner cylinder, and the lowest point of the flange drainage hole 15 formed on the flange 7 is not higher than the upper plane of the bottom of the inner cylinder. This arrangement makes it easy for all the water in the inner cylinder 6 to be discharged to the water flow chamber 11 during drainage.

[0042] Specifically, the bottom of the inner drum 6 is arranged horizontally, and an opening is arranged at the bottom of the inner drum near the center of the deceleration clutch 10. The flange 7 is arranged along the outer side of the bottom of the inner drum 6, and extends into the inner drum 6 at the opening of the bottom of the inner drum. The part extending into the flange of the bottom of the inner drum is arranged at a right angle. The vertical edge of the right-angle flange is arranged to be vertically connected to the flange outside the bottom of the inner drum, and is arranged to contact the end of the central opening of the bottom of the inner drum. The upper end of the vertical edge of the right-angle flange is the horizontal edge of the right-angle flange, and the horizontal edge of the right-angle flange is fixedly connected to the clutch outer shaft sleeve. The flange drainage hole 15 runs through the entire right-angle flange extending into the inner drum. This arrangement enables the washing water in the inner drum 6 to be completely discharged into the water flow cavity 11 along the flange drainage hole 15 under drainage conditions, and then discharged from the washing machine.

[0043] As some embodiments of the present invention, Figure 4 As shown, the rotating body is a steel bowl 8 configured to be in contact with the upper water seal 1, the steel bowl 8 is detachably connected to the flange 7, a water bowl 16 is arranged between the flange 7 and the steel bowl 8, the flange 7 is arranged at the bottom of the inner cylinder 6 and fixedly connected to the inner cylinder 6, the flange 7 is fixedly connected to the clutch outer sleeve, a flange drain hole 15 is arranged on the flange 7, and a drain hole adapted to the flange drain hole 15 is arranged on the water bowl 16, the flange 7, the clutch outer sleeve and the steel bowl 8 form a water inlet cavity, and the water inlet cavity is connected to the water flow cavity 11, so that the washing water in the inner cylinder 6 can flow into the water flow cavity 11 through the water inlet cavity.

[0044] Preferably, the flange 7 is arranged horizontally as a whole, and the flange 7 is arranged upwardly inclined near the clutch and extends into the inner tube 6. The flange drainage hole 15 is arranged at the inclined part of the flange, and the lowest end of the flange drainage hole 15 is not higher than the upper plane of the bottom of the inner tube.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A water-saving washing machine water-passing device, comprising a water-passing inlet arranged on a rotating body, characterized in that: The water inlet is rotatably inserted into the upper water seal (1) through a rotating body. The upper water seal (1) is fixedly mounted on the upper shell (2). The upper shell (2) is connected to a hollow lower shell (3) provided with a water discharge port (5). A positioning ring (4) fixedly and sealingly connected to a washing machine deceleration clutch (10) is provided in the middle of the lower part of the lower shell (3). The lowest part of the lower shell (3) is supported by a large plate of the deceleration clutch (10). A lower water seal is provided between the large plate, the positioning ring (4) and the clutch outer sleeve. The water-passing device is an independent entity, and is provided with a shape that is matched and connected with the inner barrel (6), the outer barrel (9) and the clutch (10) of the washing machine, and is installed on the washing machine; or, the water-passing device and the clutch (10) are matched and combined into an assembly, and the assembly is connected to the washing machine as a whole; The rotating body is a steel bowl (8) connected to the flange (7) of the inner drum of the washing machine. The outer wall of the steel bowl (8) is rotatably sealed with the inner lip of the upper water seal (1). The steel bowl (8) and the flange (7) are detachably connected. The flange (7) is arranged at the bottom of the inner drum (6) and is fixedly connected to the inner drum (6). The flange (7) is fixedly connected to the clutch outer shaft sleeve. A flange drain hole (15) is arranged on the flange (7). The flange (7), the clutch outer shaft sleeve and the steel bowl (8) form a water inlet cavity. A water flow cavity (11) is formed between the hollow structure of the positioning ring (4), the lower water seal, the lower shell (3) and the upper shell (2) and the clutch outer shaft sleeve. The water inlet cavity is connected to the water flow cavity (11), so that the washing water in the inner drum (6) flows into the water flow cavity (11) through the water inlet cavity. The height of the flange (7) at the connection point with the clutch outer sleeve is higher than the height of the upper plane of the bottom of the inner tube, and the lowest point of the flange drainage hole (15) formed on the flange (7) is not higher than the upper plane of the bottom of the inner tube; The bottom of the inner barrel (6) is arranged horizontally, and an opening is arranged at the bottom of the inner barrel near the center of the deceleration clutch (10). The flange (7) is arranged along the outer side surface of the bottom of the inner barrel (6) and extends into the inner barrel (6) at the opening of the bottom of the inner barrel. The portion extending into the flange of the bottom of the inner barrel is arranged at a right angle. The vertical side of the right-angle flange is vertically connected to the flange on the outer side of the bottom of the inner barrel and is arranged in contact with the end of the central opening of the bottom of the inner barrel. The upper end of the vertical side of the right-angle flange is the horizontal side of the right-angle flange. The horizontal side of the right-angle flange is fixedly connected to the outer shaft sleeve of the clutch. The flange drainage hole (15) runs through the entire right-angle flange extending into the inner barrel.

2. A water-saving washing machine water-passing device according to claim 1, characterized in that: The fixed seal is a large water seal outer lip of a washing machine deceleration clutch (10), and the outer lip is a concave U-shaped groove.

3. A water-saving washing machine water-passing device according to claim 1, characterized in that: The upper shell (2) is provided with a receiving groove, the upper water seal (1) is arranged in the space of the receiving groove, and a positioning opening (101) is formed on the other side of the upper water seal (1), the positioning opening (101) is in contact with the water inlet of the rotating body and can rotate relatively thereto.

4. A water-saving washing machine water-passing device according to claim 1, characterized in that: The lower shell (3) is formed with a step surface (302) at the assembly position with the upper shell (2).

5. The water-saving washing machine water-passing device according to claim 1, characterized in that: The bottom edge of the lower shell (3) is arranged to be concave upward from both sides toward the center, the positioning ring (4) is arranged in the middle of the lower part of the lower shell (3), and the elevation of the lower plane of the positioning ring (4) is not lower than the elevation of the lowest point of the lower shell (3).

6. A water-saving washing machine water-passing device according to claim 1 or 5, characterized in that: The drain port (5) is formed on the lower shell (3), the drain port (5) is formed on a side away from the positioning ring (4), the drain port (5) is formed at the lowest structural position of the water flow chamber (11), the lower shell (3) forms a circulation portion (17) and a drainage portion (13) at the position of the drain port, and the cross-sectional area of ​​the drainage portion (13) is larger than the cross-sectional area of ​​the circulation portion (17).

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