A drainage structure with a built-in ball shaft reverse flow preventer without an outer pipe

Abstract

The present invention discloses a built-in, outer-tube-free, ball-shaft backflow preventer drainage structure, which relates to the field of valves and includes a main body, a water inlet and a water outlet, and a water inlet chamber, a middle chamber, and a water outlet chamber arranged in sequence from the water inlet to the water outlet in the main body; a drainage chamber is also provided in the main body for receiving a drainage valve seat, the inner chamber of the drainage valve seat is connected to the water inlet chamber, a drainage outlet is provided at the bottom of the inner chamber, and the inner chamber is controlled to open and close the drainage outlet by a drainage valve core; a plurality of channels are axially provided on the outer wall of the drainage valve seat, and an inner chamber connecting hole is provided at the end of each channel for connecting the drainage chamber and the inner chamber, and the drainage chamber and the middle chamber are connected by the middle chamber connecting hole. The present invention adds a drainage valve to the structure of a double-stage check valve to realize automatic water discharge and drainage, effectively preventing water pollution caused by backflow water; the valve stem can be locked in the positioning hole by means of a locking nut, so that the drainage valve core always maintains a seal against the drainage outlet, and is suitable for scenarios where automatic drainage is not required.

Description

Technical Field

[0001] The invention relates to the field of valves, and in particular to a drainage structure of a built-in ball-shaft backflow preventer without an outer tube. Background Art

[0002] At the end of the tap water supply pipeline, each household's water pipes are connected to multiple faucets, as well as water heaters, washing machines, bathroom tanks, and other water-using appliances. When these appliances are turned off, water accumulates in their cavities and pipes. If left unused for a long time, this accumulated water can breed bacteria. If water appliances that do not meet drinking water standards are used, it can also produce rusty and polluted water. When the tap water network in a certain area experiences an abnormality, such as a burst water pipe or a shut-off of the main water supply, this accumulated water in the cavities of faucets and other water-using appliances can flow back unimpeded into the drinking water network, causing widespread contamination of the area's drinking water sources and seriously damaging people's health.

[0003] Due to the small diameter of the terminal pipeline, the valve is generally connected with a threaded pipe. Currently, a single check valve or a two-stage check valve is commonly used to prevent water backflow. Although the check valve can prevent water backflow to a certain extent, it cannot prevent the pollution of backflow water because the check valve may cause instantaneous water pollution during the closing time.

[0004] Backflow preventers are effective devices for preventing backflow and contamination in piped water supply. For example, Chinese patent document CN211231721U discloses a backflow preventer with an annular built-in drain. The device comprises a valve body, within which a cylindrical drain sealing piston, an inlet valve disc, and an outlet valve disc are arranged in sequence from front to back, along the water inlet to the water outlet. A preload spring is provided between the drain sealing piston and the front inner end face of the valve body, and a main spring is provided between the outlet valve disc and the rear inner end face of the valve body. Both the drain sealing piston and the outlet valve disc have coaxial water passage holes in their central portions. The inlet valve disc is coaxially mounted on a guide sleeve within the valve body and has a stop step at its front end. The front and rear outer diameters of the inlet valve disc are both larger than the water passage hole, allowing it to slide and seal the water passage hole. The outer periphery of the guide sleeve forms an annular valve channel, the front outer periphery of the valve channel forming an annular drain channel separated by a cylindrical wall. A drain opening is provided around the drain channel, which is sealed when the drain sealing piston moves back to abut the front end face of the cylindrical wall. The following defects are common in the prior art using this structure as an example:

[0005] 1. The drainer only has a backflow drainage function. When used in scenarios where automatic drainage is not required, it cannot actively seal.

[0006] 2. The drain (or drain valve) uses the valve core to guide water instead of the valve seat. After long-term use, the valve core is prone to blockage or damage, resulting in failure of the backflow drainage function or valve leakage.

[0007] 3. Once the drainer or valve fails, the entire device must be replaced. The valve seat and valve core cannot be removed separately for replacement. Summary of the Invention

[0008] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a drainage structure with a built-in ball shaft backflow preventer without an outer tube. The channel on the outer wall of the valve seat is used to guide water, which has a better water guiding effect and a long service life. The drain outlet can be manually locked when automatic drainage is not required.

[0009] The objective of the present invention is achieved through the following technical solutions: this built-in outer tube-free ball shaft backflow preventer drainage structure includes a main body, a water inlet and a water outlet opposite to the water inlet are provided on the main body, and a water inlet chamber, a middle chamber and a water outlet chamber are sequentially arranged in the direction from the water inlet to the water outlet in the main body, the water inlet chamber and the middle chamber are controlled to be connected or sealed by an inlet valve flap, and the middle chamber and the water outlet chamber are controlled to be connected or sealed by an outlet valve flap; a drainage chamber is also provided in the main body, a drainage valve seat is placed in the drainage chamber, an inner chamber is provided through the drainage valve seat, the top of the inner chamber is connected to the water inlet chamber by a water inlet chamber connecting hole, a drainage outlet is provided at the bottom of the inner chamber, a drainage valve core is installed in the inner chamber of the drainage valve seat through a spring sliding, which is used to control the opening or closing of the drainage outlet at the bottom of the drainage valve seat; a plurality of channels are provided axially on the outer wall of the top of the drainage valve seat, and an inner chamber connecting hole is provided at the end of each channel for connecting the drainage chamber and the inner chamber, and the drainage chamber and the middle chamber are connected by the middle chamber connecting hole.

[0010] As a further technical solution, the drain valve core includes a valve stem, a sphere arranged on the top of the valve stem, and a piston arranged on the top of the sphere, and the piston slides up and down along the inner cavity wall; a sealing ring mounting groove and a spring mounting groove are sequentially opened on the inner cavity wall below the inner cavity communicating hole, and the drainage sealing ring is placed in the sealing ring mounting groove to cooperate with the sphere for sealing, thereby opening or closing the drain outlet, and one end of the spring is pressed against the sphere, and the other end is supported on the spring mounting groove, so that the drain outlet is in an open state in a natural state.

[0011] As a further technical solution, a positioning hole is provided at the center of the drain outlet for the valve stem to pass through and position, and a locking nut is threadedly connected to the lower end of the valve stem for locking the valve stem in conjunction with the positioning hole.

[0012] As a further technical solution, the drain valve seat is tightened in the drain cavity by a locking joint, and the locking joint sleeved on the outer periphery of the drain outlet is sealed and connected to the bottom of the drain cavity.

[0013] As a further technical solution, the outer circumference of the top of the drain valve seat is chamfered so that there is a gap between the top of the drain valve seat and the drain cavity, and each channel is connected to the connecting hole of the middle cavity through the gap.

[0014] As a further technical solution, a retaining ring groove is provided at the top of the inner cavity for inserting a retaining ring, and the retaining ring is used to stop the piston.

[0015] As a further technical solution, the channels are grooves or holes uniformly distributed along the outer circumference of the drain valve seat.

[0016] As a further technical solution, the ball and the valve stem are formed in one piece or connected by threads, and the piston and the ball are formed in one piece or have a split structure.

[0017] As a further technical solution, the main body includes a water inlet section and a water outlet section sealed and connected to the water inlet section, the water inlet is provided on the water inlet section, and the water outlet is provided on the water outlet section.

[0018] As a further technical solution, the water inlet valve disc is installed on the sealing surface of the water inlet chamber, and a support plate is sealed between the middle chamber and the water outlet chamber. One end of the water inlet valve disc spring is supported on the support plate, and the other end is installed on the water inlet valve disc; the water outlet valve disc is installed on the sealing surface of the support plate, and one end of the water outlet valve disc spring is installed on the water outlet valve disc, and the other end is supported on the inner wall of the water outlet section.

[0019] The beneficial effects of the present invention are:

[0020] 1. Add a drain valve to the structure of the double-stage check valve to achieve automatic water discharge and drainage, effectively preventing water pollution caused by backflow;

[0021] 2. The valve stem of the drain valve is guided and positioned using the positioning hole to ensure smooth operation of the drain valve. The valve stem can be locked in the positioning hole with the help of a locking nut, so that the drain valve core always maintains a seal on the drain outlet. It can be used as a conventional two-stage check valve and is suitable for scenarios where automatic drainage is not required.

[0022] 3. The drain valve seat is installed in the drain cavity through a locking joint, which is convenient for disassembling the drain valve core and the drain valve seat. At the same time, the ball, valve stem and piston can adopt a split or integral structure, which can be flexibly replaced when the drainer or valve fails. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0024] Figure 2 for Figure 1 AA cross-sectional view.

[0025] Figure 3 It is a schematic diagram of the main structure of the water inlet section in the present invention.

[0026] Figure 4 for Figure 3 BB cross-sectional view.

[0027] Figure 5 It is a schematic diagram of the three-dimensional structure of the drain valve seat in the present invention.

[0028] Figure 6 It is a schematic diagram of the top structure of the drain valve seat in the present invention.

[0029] Figure 7 for Figure 6 CC cross-sectional view.

[0030] Figure 8 This is a cross-sectional view of the drainage valve seat structure using a groove-type channel in the present invention.

[0031] Figure 9 for Figure 8 DD cross-sectional view.

[0032] Figure 10 for Figure 8 EE cross-sectional view.

[0033] Figure 11 for Figure 8 FF cross-sectional view.

[0034] Figure 12 This is a cross-sectional view of the drainage valve seat structure using a hole-type channel in the present invention.

[0035] Figure 13 for Figure 12 GG cross-sectional view.

[0036] Figure 14 for Figure 12 HH cross-sectional view.

[0037] Figure 15 This is a schematic diagram of the split ball and valve stem structure used in the present invention.

[0038] Figure 16 This is a schematic diagram of the integrated ball and valve stem structure used in the present invention.

[0039] Figure 17 This is a schematic diagram of the split drainage valve core structure used in the present invention.

[0040] Figure 18 This is a schematic diagram of the integrated drainage valve core structure used in the present invention.

[0041] Figure 19 This is a schematic diagram of water flow when the present invention is working.

[0042] Figure 20 for Figure 19 A partial enlarged schematic diagram of area I in the middle (there is pressure and water at the water inlet).

[0043] Figure 21for Figure 19 A partial enlarged schematic diagram of area I in the middle (no pressure and no water at the water inlet).

[0044] Figure 22 for Figure 19 A partial enlarged schematic diagram of area I in the middle (drain outlet sealed state).

[0045] Explanation of the accompanying drawings: main body 1, retaining ring groove 2, piston 3, drain valve core 4, drain valve seat 5, spring 6, locking joint 7, retaining ring 8, drain sealing ring 9, water inlet chamber connecting hole 10, middle chamber connecting hole 11, locking nut 12, sphere 13, valve stem 14, chamfer 15, channel 16, water inlet 17, water outlet 18, water inlet valve disc 19, water outlet valve disc 20, water inlet section 21, water outlet section 22, sealing ring mounting groove 23, spring mounting groove 24, water inlet chamber 25, middle chamber 26, water outlet chamber 27, inner chamber connecting hole 28, drain outlet 29, positioning hole 30, inner chamber 31, support plate 32, water inlet valve disc spring 33, water outlet valve disc spring 34, drain chamber 35. DETAILED DESCRIPTION

[0046] The present invention will be described in detail below with reference to the accompanying drawings:

[0047] Example: As shown in the attached Figures 1 to 22 As shown, this built-in ball-shaft backflow preventer drainage structure without an outer tube includes a main body 1, a retaining ring groove 2, a piston 3, a drain valve core 4, a drain valve seat 5, a spring 6, a locking joint 7, a retaining ring 8, a drain sealing ring 9, a water inlet chamber communicating hole 10, a middle chamber communicating hole 11, a locking nut 12, a sphere 13, a valve stem 14, a chamfer 15, a channel 16, a water inlet 17, a water outlet 18, a water inlet valve disc 19, a water outlet valve disc 20, a water inlet section 21, a water outlet section 22, a sealing ring mounting groove 23, a spring mounting groove 24, a water inlet chamber 25, a middle chamber 26, a water outlet chamber 27, an inner chamber communicating hole 28, a drain outlet 29, a positioning hole 30, an inner chamber 31, a support plate 32, a water inlet valve disc spring 33, a water outlet valve disc spring 34 and a drain chamber 35.

[0048] Reference Attachment Figure 2On the left side of the main body 1 is the water inlet section 21 (with a water inlet 17), and on the right side of the main body 1 is the water outlet section 22 (with a water outlet 18 opposite the water inlet 17). The water inlet section 21 and the water outlet section 22 are threadedly connected and sealed with a sealing ring. From left to right (from the water inlet 17 to the water outlet 18), the main body 1 is provided with an inlet chamber 25, a middle chamber 26, and a water outlet chamber 27. The inlet valve disc 19 is mounted on the sealing surface of the water inlet chamber 25, and a support plate 32 is sealed between the middle chamber 26 and the water outlet chamber 27. The right end of the inlet valve disc spring 33 is supported on the support plate 32 by a bracket, and the left end of the inlet valve disc spring 33 is mounted on the inlet valve disc 19. The outlet valve disc 20 is mounted on the sealing surface of the support plate 32. The left end of the outlet valve disc spring 34 is mounted on the outlet valve disc 20, and the right end of the outlet valve disc spring 34 is supported on the inner wall of the outlet section 22. When water pressure is applied at water inlet 17, water flows into water inlet chamber 25 and pushes water inlet valve flap 19. Water inlet valve flap spring 33 is gradually compressed, opening the sealing surface of water inlet chamber 25 and allowing water to flow into middle chamber 26. Water then continues to push water outlet valve flap 20. Water outlet valve flap spring 34 is gradually compressed, opening the sealing surface of support plate 32. Water then flows into water outlet chamber 27 and out through water outlet 18. When the water pressure at water inlet 17 disappears, water inlet valve flap spring 33 and water outlet valve flap spring 34 automatically return to their original positions, closing the sealing surfaces and achieving a double-stage check valve.

[0049] like Figure 4 、 5 As shown in FIG. 7 , a drainage cavity 35 is further provided in the main body 1 , into which a drainage valve seat 5 is placed. The drainage valve seat 5 has an inner cavity 31 extending through its center. Figure 20 As shown, the top (upper opening) of the inner cavity 31 is connected to the water inlet cavity 25 by the water inlet cavity connecting hole 10, and a drain outlet 29 is provided at the bottom of the inner cavity 31. The inner cavity 31 of the drain valve seat 5 is slidably mounted with a drain valve core 4 through a spring 6. The drain valve core 4 can control the drain outlet 29 at the bottom of the drain valve seat 5 to open or close. Figure 5 As shown, four channels 16 are axially opened on the outer wall of the top of the drain valve seat 5, and an inner cavity connecting hole 28 is opened at the end of each channel 16 to connect the drain cavity 35 and the inner cavity 31. The drain cavity 35 and the middle cavity 26 are connected by the middle cavity connecting hole 11.

[0050] For further information, see the attached Figure 20 The drain valve core 4 includes a valve stem 14, a ball 13 disposed on the top of the valve stem 14, and a piston 3 disposed on the top of the ball. The piston 3 can slide up and down along the inner wall of the inner cavity 31. Figure 7As shown, a sealing ring mounting groove 23 and a spring mounting groove 24 are sequentially formed on the wall of the inner cavity 31 below the inner cavity communication hole 28. The drain sealing ring 9 is placed in the sealing ring mounting groove 23 and can cooperate with the ball 13 to seal, thereby opening or closing the drain port 29. The upper end of the spring 6 presses against the ball 13, and the lower end is supported by the spring mounting groove 24. Therefore, in the natural state (i.e., when there is no pressure on the piston 3), the ball 13 is separated from the drain sealing ring 9 by the action of the spring 6, leaving the drain port 29 in the open state.

[0051] like Figure 11 As shown, a positioning hole 30 is provided at the center of the drain outlet 29 for the valve stem 14 to pass through and position. A locking nut 12 is threadedly connected to the lower end of the valve stem 14. After tightening the locking nut 12, the valve stem 14 can be locked in the positioning hole 30 and cannot move upward. At this time, the ball 13 is always in contact and sealed with the drain sealing ring 9, and the drain outlet 29 is in a normally sealed state.

[0052] Reference Attachment Figure 5 、 7 A chamfer 15 is provided on the outer circumference of the top of the drain valve seat 5, so that there is a gap between the top of the drain valve seat 5 and the drain cavity 35. Each channel 16 can be connected with the middle cavity communicating hole 11 through the gap. The water in the middle cavity 26 enters the inner cavity 31 along the middle cavity communicating hole 11, the channel 16, and the inner cavity communicating hole 28, so that it can be discharged from the drain outlet 29.

[0053] Preferably, a retaining ring groove 2 is provided at the top of the inner cavity 31 for receiving a retaining ring 8. The retaining ring 8 can stop the piston 3 and limit the upward movement of the piston 3. The drain valve seat 5 is tightened in the drain cavity 35 by a locking joint 7. The locking joint 7 is sleeved around the outer periphery of the drain port 29 and is sealed (threaded) to the bottom of the drain cavity 35.

[0054] like Figure 9 、 10 As shown, the four channels 16 are groove-shaped structures uniformly distributed along the outer circumference of the drain valve seat 5, and the lower ends of the groove-shaped structures are connected to the inner cavity communication holes 28. Figure 13 、 14 As shown, the four channels 16 may also be hole-type structures uniformly distributed along the outer circumference of the drain valve seat 5 , and the lower ends of the hole-type structures are connected to the inner cavity communication holes 28 .

[0055] Preferably, refer to the attached Figure 15 The ball 13 and the valve stem 14 are connected by threads, and the valve stem 14 is a stud bolt. Figure 16 As shown, the ball 13 and the valve stem 14 can also be an integrated structure, and an external thread is provided at the lower end of the valve stem 14 to facilitate the installation of the locking nut 12. Figure 17 、 18As shown, the piston 3 and the ball 13 are formed in one piece or in a split structure, which can be flexibly selected according to actual needs.

[0056] The working process of the present invention is as follows: Figure 19 、 20 As shown (the direction indicated by the arrow in the figure is the direction of water flow), when there is pressure and water at the water inlet 17, the water flows into the water inlet chamber 25 and pushes the water inlet valve disc 19. The water inlet valve disc spring 33 is gradually compressed, causing the sealing surface of the water inlet chamber 25 to open, and the water flows into the middle chamber 26. Then, the water flow continues to push the water outlet valve disc 20. The water outlet valve disc spring 34 is gradually compressed, causing the sealing surface of the support plate 32 to open, and the water flows into the water outlet chamber 27 and flows out from the water outlet 18. At the same time, part of the water flows into the inner cavity 31 of the drain valve seat 5 through the water inlet chamber connecting hole 10, and pushes the piston 3, causing the steel ball 13 to contact and seal with the drain sealing ring 9. The drain outlet 29 is automatically sealed, that is, when the water is discharged normally, no water is discharged from the drain outlet 29.

[0057] When there is no pressure or water at the water inlet 17, the water inlet valve flap spring 33 and the water outlet valve flap spring 34 automatically return to their original positions, closing the sealing surface to achieve a double-stage check. Figure 21 As shown, at this time, the spring 6 is reset, and the piston 3 moves upward under the action of the ball 13 until it is stopped by the retaining spring 8. The ball 13 disengages from the drainage sealing ring 9, and the drain outlet 29 is opened; the residual water in the middle cavity 26 flows along the middle cavity connecting hole 11, the channel 16, and the inner cavity connecting hole 28 into the inner cavity 31 and is finally discharged from the drain outlet 29.

[0058] like Figure 22 As shown, by manually tightening the locking nut 12, the valve stem 14 can be locked in the positioning hole 30 and cannot move upward. At this time, the ball 13 is always in contact and sealed with the drainage sealing ring 9, and the drain outlet 29 is in a normally sealed state, which is suitable for scenarios where automatic drainage is not required.

[0059] It is understandable that for those skilled in the art, any equivalent replacement or change to the technical solution and inventive concept of the present invention should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A drainage structure with a built-in ball-shaft backflow preventer without an outer tube, characterized by: The invention comprises a main body (1), wherein a water inlet (17) and a water outlet (18) opposite to the water inlet (17) are provided on the main body (1); a water inlet chamber (25), a middle chamber (26) and a water outlet chamber (27) are sequentially provided in the main body (1) in the direction from the water inlet (17) to the water outlet (18); the water inlet chamber (25) and the middle chamber (26) are connected or sealed by a water inlet valve flap (19); the middle chamber (26) and the water outlet chamber (27) are connected or sealed by a water outlet valve flap (20); a drainage chamber (35) is further provided in the main body (1); a drainage valve seat (5) is installed in the drainage chamber (35); and the drainage valve seat (5) is provided with a valve seat (5) extending therethrough. The inner cavity (31) is connected to the water inlet cavity (25) through the water inlet cavity communicating hole (10). The inner cavity (31) is provided with a drain port (29) at the bottom. The inner cavity (31) of the drain valve seat (5) is slidably mounted with a drain valve core (4) via a spring (6) for controlling the opening or closing of the drain port (29) at the bottom of the drain valve seat (5). A plurality of channels (16) are provided on the outer wall of the top of the drain valve seat (5) along the axial direction. The inner cavity communicating hole (28) is provided at the end of each channel (16) for connecting the drain cavity (35) and the inner cavity (31). The drain cavity (35) is connected to the middle cavity (26) through the middle cavity communicating hole (11).

2. The drainage structure of the built-in ball-shaft backflow preventer without an outer tube according to claim 1, characterized in that: The drain valve core (4) comprises a valve stem (14), a sphere (13) arranged on the top of the valve stem (14), and a piston (3) arranged on the top of the sphere, and the piston (3) slides up and down along the wall of the inner cavity (31); a sealing ring installation groove (23) and a spring installation groove (24) are sequentially opened on the wall of the inner cavity (31) below the inner cavity communicating hole (28); a drain sealing ring (9) is placed in the sealing ring installation groove (23) for cooperating with the sphere (13) to perform sealing, thereby opening or closing the drain outlet (29); one end of the spring (6) is pressed against the sphere (13), and the other end is supported in the spring installation groove (24), so that the drain outlet (29) is in an open state in a natural state.

3. The drainage structure of the built-in ball-shaft backflow preventer without an outer tube according to claim 2, characterized in that: A positioning hole (30) is provided at the center of the drain port (29) for the valve stem (14) to pass through and position. A locking nut (12) is threadedly connected to the lower end of the valve stem (14) for cooperating with the positioning hole (30) to lock the valve stem (14).

4. The drainage structure of the built-in ball-shaft backflow preventer without an outer tube according to claim 3, characterized in that: The drain valve seat (5) is pressed tightly against the drain cavity (35) via a locking joint (7), and the locking joint (7) sleeved on the outer periphery of the drain port (29) is sealed and connected to the bottom of the drain cavity (35).

5. The drainage structure of the built-in ball-shaft backflow preventer without an outer tube according to claim 4, characterized in that: The outer circumference of the top of the drain valve seat (5) is provided with a chamfer (15), so that a gap exists between the top of the drain valve seat (5) and the drain cavity (35), and each channel (16) is connected to the middle cavity communication hole (11) through the gap.

6. The drainage structure of the built-in ball-shaft backflow preventer without an outer tube according to claim 5, characterized in that: A retaining ring groove (2) is provided at the top of the inner cavity (31) for inserting a retaining ring (8), and the retaining ring (8) is used to stop the piston (3).

7. The drainage structure of the built-in ball-shaft backflow preventer without an outer tube according to claim 6, characterized in that: The channels (16) are grooves or holes uniformly distributed along the outer circumference of the drain valve seat (5).

8. The drainage structure of a built-in ball-shaft backflow preventer without an outer tube according to claim 7, characterized in that: The sphere (13) and the valve stem (14) are formed in one piece or connected by threads, and the piston (3) and the sphere (13) are formed in one piece or have a split structure.

9. The drainage structure of the built-in ball-shaft backflow preventer without an outer tube according to claim 8, characterized in that: The main body (1) comprises a water inlet section (21) and a water outlet section (22) sealedly connected to the water inlet section (21); the water inlet (17) is provided on the water inlet section (21); and the water outlet (18) is provided on the water outlet section (22).

10. The drainage structure of the built-in ball-shaft backflow preventer without an outer tube according to claim 9, characterized in that: The water inlet valve disc (19) is mounted on the sealing surface of the water inlet cavity (25); a support disc (32) is sealed between the middle cavity (26) and the water outlet cavity (27); one end of the water inlet valve disc spring (33) is supported on the support disc (32), and the other end is mounted on the water inlet valve disc (19); the water outlet valve disc (20) is mounted on the sealing surface of the support disc (32); one end of the water outlet valve disc spring (34) is mounted on the water outlet valve disc (20), and the other end is supported on the inner wall of the water outlet section (22).

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