Tubular filter element for candle filter

Abstract

The utility model relates to the related technical field of candle filters, and discloses a tubular filter element for a candle filter, which is characterized in that an inner-layer filter tube is arranged in an outer-layer filter tube, one end of the inner-layer filter tube is fixedly connected with a first fixed annular plate, and the other end of the inner-layer filter tube is fixedly connected with a second fixed annular plate; a stainless steel filtering hole pipe is fixedly installed on the outer side of the first fixed annular plate, a water inlet connector is fixedly connected to the end of the stainless steel filtering hole pipe, and a drainage connector is fixedly connected to the outer side of the second fixed annular plate; the mixture of the dirt and the liquid finally rises along the outer wall of the metal cylinder and enters the metal cylinder through the water inlet one-way valve, and then the liquid is filtered again through the inner-layer filter bag, is finally discharged from the first water discharging one-way valve and enters the box body; the arrangement of the water inlet one-way valve ensures that only preliminarily filtered water can enter the metal cylinder.

Description

Technical Field

[0001] The utility model belongs to the technical field related to candle filters, and more specifically, particularly relates to a tubular filter element for candle filters. Background Art

[0002] With the continuous development of industrial production, the requirements for liquid filtration are getting higher and higher. With its unique structure and efficient filtration performance, candle filters can meet the needs of various industrial fields for refined and efficient liquid filtration. Especially in the chemical, pharmaceutical, food and beverage industries, candle filters have become an indispensable filtration equipment.

[0003] As the candle filter accumulates dirt during use, the filter element will become more clogged, causing the pressure drop of the filter to increase. The increase in pressure drop will not only affect the filtration efficiency, but may also impose additional burdens on the equipment and even cause equipment damage. The accumulation of dirt may also limit the filtration efficiency of the candle filter and make it unable to effectively remove fine particles in the liquid, which may affect the quality and purity of the product.

[0004] Therefore, in view of this, the existing structure and defects are studied and improved, and a tubular filter element for a candle filter is provided, in order to achieve a more practical purpose. Utility Model Content

[0005] The utility model provides a tubular filter element for a candle filter, which is used to overcome the above-mentioned defects in the prior art.

[0006] The purpose and function of the tubular filter element for candle filter of the utility model are achieved by the following specific technical means:

[0007] A tubular filter element for a candle filter comprises: an outer filter tube, an inner filter tube is installed inside the outer filter tube, one end of the inner filter tube is fixedly connected with a first fixed annular plate, and the other end of the inner filter tube is fixedly connected with a second fixed annular plate, a stainless steel filter hole tube is fixedly installed on the outer side of the first fixed annular plate, an inlet joint is fixedly connected to the end of the stainless steel filter hole tube, a drainage joint is fixedly connected to the outer side of the second fixed annular plate, a cleaning collection device is installed inside the inner filter tube, the cleaning collection device comprises a box body, a metal cylinder and a cleaning assembly, a metal cylinder is connected above the box body, a cleaning assembly is provided on the outer side of the metal cylinder, a plurality of return spring members are fixedly connected to the outer side of the cleaning assembly, one end of the return spring member is connected to the inner wall of the first fixed annular plate, the cleaning assembly comprises a cleaning plate, the outer side of the cleaning plate is fixedly connected to the other end of the return spring member, and a second drainage check valve is installed on the cleaning plate.

[0008] A further technical solution is that a plurality of cleaning balls are arranged in an array at one end of the cleaning plate, and a U-shaped groove is arranged between each two of the cleaning balls in the array, a fixed base plate is fixedly installed in the U-shaped groove, a hammer assembly is fixedly installed on the fixed base plate, the hammer assembly includes a swing spring, a fixed block and a knocking hammer, one end of the swing spring is connected to the fixed base plate, the other end of the swing spring is connected to a fixed block, knocking hammers are fixedly installed on both sides of the fixed block, and the two knocking hammers point to the second fixed annular plates corresponding to the two sides.

[0009] According to a further technical solution, a circular arc rubber head is provided at the other end of the cleaning plate, the cleaning ball is arranged at one side of the inner filter tube, and the circular arc rubber head is arranged at one side of the metal cylinder.

[0010] According to a further technical solution, a piston plate is provided inside the box body, and the piston plate divides the internal cavity of the box body into an extrusion cavity and a water collecting cavity, and the water collecting cavity is arranged above the extrusion cavity.

[0011] According to a further technical solution, an extrusion spring is fixedly installed inside the extrusion chamber, and the extrusion spring is arranged between the piston plate and the bottom wall of the box body.

[0012] A further technical solution is that two water spray outlets are provided on the box body, and a drainage device is installed in the water spray outlet, and the drainage device includes a vertical upright plate and an inclined block plug. A limiting inclined block is fixedly provided at the end of the vertical upright plate, and an inclined block plug is provided below the limiting inclined block. Baffles are fixedly provided on the two outer inclined surfaces of the inclined block plug, and the baffles are in contact with the limiting inclined block to control the water spraying effect of the water spray outlet.

[0013] According to a further technical solution, a connecting block is fixedly installed below the inclined block plug, a connecting rod is fixedly connected to the connecting block, and an end of the connecting rod is fixedly connected to the piston plate.

[0014] According to a further technical solution, a plurality of external convex points are arranged in a vertical array on the surface of the metal cylinder, and the external convex points are in contact with the arc rubber head.

[0015] According to a further technical solution, a water inlet check valve is fixedly installed at the open end of the metal cylinder, a first water discharge check valve is provided at the connection between the metal cylinder and the box body, an inner filter bag is fixedly installed inside the metal cylinder, and the inner filter bag is arranged between the water inlet check valve and the first water discharge check valve.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The utility model discloses a tubular filter element for candle filter, which is provided with a cleaning assembly and a hammer assembly. When the cleaning assembly moves downward, the cleaning ball is responsible for cleaning the inside of the inner filter tube, and the dirt generated during the cleaning process will be mixed into the liquid above the cleaning assembly. When the cleaning assembly moves downward, the arc rubber head at the other end thereof will contact the outer convex point, and this contact will cause the cleaning assembly to shake and bump.

[0018] As a result, the hammer assembly between the two cleaning balls will also shake. The swing spring on the upper part of the hammer assembly will drive the fixed block to swing after being bumped, and then the fixed block will drive the hammer to collide with the cleaning ball. This collision can make the stubborn dirt attached to the surface of the cleaning ball fall off, so as to achieve the best cleaning effect, and the cleaning ball directly acts on the inside of the inner filter tube to effectively remove the dirt, and the shaking and bumping design helps to loosen and remove the more difficult to handle stubborn dirt, thereby speeding up the cleaning process and enhancing the cleaning effect;

[0019] Through the interaction of the swing spring, fixed block and striking hammer in the hammer assembly, additional impacts are applied to the cleaning ball, which not only removes dirt on the surface, but also deeply cleans hard-to-reach areas, ensuring a more thorough and even cleaning effect.

[0020] The utility model discloses a tubular filter element for candle filter, which has the function of filtering and intercepting by providing an inner filter bag and a water inlet check valve arranged inside a metal cylinder. When the water body is located above the cleaning component and is filtered and discharged to the outside, since the drainage volume is less than the water inlet volume of the water inlet check valve, the water flow near the inner filter tube forms a negative pressure, and the fluidity is relatively slow; while the water flow far from the inner filter tube has a faster fluidity, thus forming a circulating flow of the liquid. The mixture of dirt and liquid will eventually rise along the outer wall of the metal cylinder and enter the inside of the metal cylinder through the water inlet check valve. Subsequently, these liquids are filtered again by the inner filter bag, and finally discharged from the first drainage check valve and enter the inside of the box. The setting of the water inlet check valve ensures that only water that has been initially filtered can enter the inside of the metal cylinder, which helps to prevent large particles of impurities from directly entering the filtering system, thereby extending the service life of the inner filter bag and improving the overall filtering efficiency. Through the design that the drainage volume is less than the water inlet volume, the water flow near the inner filter tube forms a negative pressure, and the fluidity is relatively slow, while the water flow far from the tube has a faster fluidity. This differentiated water flow dynamics promotes the circulation of liquid, helping to more effectively carry the dirt and liquid mixture to the outer wall of the metal cylinder and enter the cylinder through the water inlet check valve. As the dirt and liquid mixture rises along the outer wall of the metal cylinder and enters the cylinder through the water inlet check valve, they will be filtered again by the inner filter bag. This process not only helps remove impurities, but also realizes the self-cleaning of the system, reducing maintenance requirements.

[0021] The utility model discloses a tubular filter element for a candle filter, which is provided with a water collecting chamber. When the liquid enters the interior of the box, it will first flow into the water collecting chamber. As the amount of liquid increases, the water collecting chamber will expand, and then squeeze the piston plate therein to make it descend. The descent of the piston plate will drive the inclined block plug to descend together. When the inclined block plug descends to a certain position, the baffles on both sides thereof will separate from the limiting inclined block, thereby forming a gap between them, allowing the water body to be discharged from the gap. Since the liquid discharged from the water collecting chamber is pressurized, when the pressurized liquid is discharged into the cavity below the cleaning component, the cavity will be pressurized and recoiled. This pressurized recoil effect can increase the filtering speed and effectively prevent the occurrence of blockage. Through the expansion of the water collecting chamber and the linkage effect of the piston plate and the inclined block plug, the discharge of the liquid can be efficiently controlled. When the liquid reaches a certain amount, it is automatically discharged through the gap, avoiding the overflow or leakage problem caused by excessive liquid, and the pressurized liquid discharged from the water collecting chamber can pressurize and recoil the cavity below the cleaning component. This recoil action can effectively flush out the dirt and impurities in the cavity, improve the filtration efficiency and ensure smooth operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall appearance structure of the utility model.

[0023] Figure 2 It is a schematic diagram of the overall front view structure of the utility model.

[0024] Figure 3 It is a schematic diagram of the overall top view structure of the utility model.

[0025] Figure 4 It is a schematic diagram of the overall front section structure of the utility model.

[0026] Figure 5 It is a schematic diagram of the overall structure of the cleaning collection device of the utility model.

[0027] Figure 6 This utility model Figure 5 A in the figure is an enlarged structural diagram.

[0028] Figure 7 This utility model Figure 6 The enlarged structural diagram at B in FIG.

[0029] Figure 8 This utility model Figure 5 The enlarged structural diagram at C in the figure.

[0030] Fig. 9 This utility model Figure 7 The enlarged structural diagram at D in the figure.

[0031] Description of reference numerals:

[0032] Outer filter tube 11, stainless steel filter hole tube 12, water inlet joint 13, drain joint 14, inner filter tube 15, cleaning collection device 16, reset spring member 17, metal cylinder 18, outer convex point 19, inner filter bag 20, water inlet check valve 21, first drain check valve 22, first fixed annular plate 23, box body 24, extrusion chamber 25, water collecting chamber 26, piston plate 27, extrusion spring 28, drain device 29, cleaning assembly 30, cleaning plate 31, cleaning ball 32, second drain check valve 33, second fixed annular plate 34, hammer assembly 35, vertical plate 36, limiting inclined block 37, inclined block plug 38, connecting block 39, connecting rod 40, U-shaped groove 41, fixed bottom plate 42, fixed block 43, swing spring 44, knocking hammer 45, arc rubber head 46. DETAILED DESCRIPTION

[0033] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0034] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example

[0036] As attached Figure 1 To Attachment Fig. 9 As shown:

[0037] The utility model provides a tubular filter element for a candle type filter.

[0038] See attached Figure 1 To Attachment Fig. 9, comprising: an outer filter tube 11, an inner filter tube 15 is installed inside the outer filter tube 11, one end of the inner filter tube 15 is fixedly connected with a first fixed annular plate 23, the other end of the inner filter tube 15 is fixedly connected with a second fixed annular plate 34, a stainless steel filter hole tube 12 is fixedly installed on the outer side of the first fixed annular plate 23, an inlet joint 13 is fixedly connected at the end of the stainless steel filter hole tube 12, a drainage joint 14 is fixedly connected on the outer side of the second fixed annular plate 34, a clean collection joint is installed inside the inner filter tube 15 Device 16, the cleaning collection device 16 includes a box body 24, a metal cylinder 18 and a cleaning assembly 30, the metal cylinder 18 is connected to the top of the box body 24, the cleaning assembly 30 is provided on the outside of the metal cylinder 18, a plurality of return spring members 17 are fixedly connected to the outside of the cleaning assembly 30, one end of the return spring member 17 is connected to the inner wall of the first fixed annular plate 23, the cleaning assembly 30 includes a cleaning plate 31, the outer side of the cleaning plate 31 is fixedly connected to the other end of the return spring member 17, and a second drainage one-way valve 33 is installed on the cleaning plate 31.

[0039] Preferably, see Attachment Figure 5 To Attachment Fig. 9 A plurality of cleaning balls 32 are arranged in an array at one end of the cleaning plate 31, and a U-shaped groove 41 is arranged between each of the two cleaning balls 32 in the array. A fixed base plate 42 is fixedly installed in the U-shaped groove 41, and a hammer assembly 35 is fixedly installed on the fixed base plate 42. The hammer assembly 35 includes a swing spring 44, a fixed block 43 and a knocking hammer 45. One end of the swing spring 44 is connected to the fixed base plate 42, and the other end of the swing spring 44 is connected to the fixed base plate 42. Knocking hammers 45 are fixedly installed on both sides of the fixed block 43, and the two knocking hammers 45 point to the second fixed annular plate 34 corresponding to the two sides.

[0040] Preferably, see Attachment Figure 5 And attached Figure 6 The other end of the cleaning plate 31 is provided with an arc rubber head 46 , the cleaning ball 32 is arranged on one side of the inner filter tube 15 , and the arc rubber head 46 is arranged on one side of the metal cylinder 18 .

[0041] Preferably, see Attachment Figure 5 A piston plate 27 is provided inside the box body 24 , and the piston plate 27 divides the internal cavity of the box body 24 into an extrusion cavity 25 and a water collecting cavity 26 . The water collecting cavity 26 is arranged above the extrusion cavity 25 .

[0042] Preferably, see Attachment Figure 5A pressing spring 28 is fixedly installed inside the pressing chamber 25 , and the pressing spring 28 is arranged between the piston plate 27 and the bottom wall of the box body 24 .

[0043] Preferably, see Attachment Figure 5 And attached Figure 8 Two water spray outlets are provided on the box body 24, and a drainage device 29 is installed in the water spray outlet. The drainage device 29 includes a vertical upright plate 36 and an inclined block plug 38. A limiting inclined block 37 is fixedly provided at the end of the vertical upright plate 36, and an inclined block plug 38 is provided below the limiting inclined block 37. Baffles are fixedly provided on the two outer inclined surfaces of the inclined block plug 38. The baffles are in contact with the limiting inclined block 37 to control the water spraying effect of the water spray outlet.

[0044] Preferably, see Attachment Figure 5 And attached Figure 8 A connecting block 39 is fixedly installed below the inclined block plug 38 , and a connecting rod 40 is fixedly connected to the connecting block 39 , and an end of the connecting rod 40 is fixedly connected to the piston plate 27 .

[0045] Preferably, see Attachment Figure 5 The surface of the metal cylinder 18 is provided with a plurality of external protrusions 19 in a vertical array, and the external protrusions 19 are in contact with the arc rubber head 46 .

[0046] Preferably, see Attachment Figure 5 A water inlet check valve 21 is fixedly installed at the open end of the metal cylinder 18, a first water discharge check valve 22 is provided at the connection between the metal cylinder 18 and the box body 24, an inner filter bag 20 is fixedly installed inside the metal cylinder 18, and the inner filter bag 20 is arranged between the water inlet check valve 21 and the first water discharge check valve 22.

[0047] Specific usage of this utility model:

[0048] When using the utility model, first place the device into the container to be filtered, then connect the water inlet joint 13 of the device to the water inlet pipe, and connect the drainage joint 14 to the water outlet pipe. After the connection is completed, the device can be used for filtering. When in use, the liquid in the filter cavity will enter the inner filter tube 15, so that the inner filter tube 15 is filled with liquid.

[0049] After the liquid flows in from the water inlet joint 13, it will first enter the stainless steel filter perforated tube 12. Then, the liquid will further enter the inner filter tube 15 through the stainless steel filter perforated tube 12. When the liquid enters the inner filter tube 15, it will encounter a certain resistance, thereby pushing the cleaning components 30 on both sides of the metal cylinder 18 to move downward. As the cleaning component 30 descends, it will push the liquid below to be discharged. At the same time, the liquid entering from the stainless steel filter perforated tube 12 will be discharged above the cleaning component 30, achieving a preliminary filtering effect.

[0050] When the cleaning assembly 30 moves to its maximum bearing range, the reset spring 17 will work to reset the cleaning assembly 30. During the reset and recovery process, the cleaning ball 32 at one end of the cleaning assembly 30 will clean the inside of the inner filter tube 15. The cleaned dirt will be mixed in the liquid above the cleaning assembly 30.

[0051] During the downward movement of the cleaning assembly 30, the arc rubber head 46 at the other end of the cleaning ball 32 will contact the outer convex point 19, causing the cleaning assembly 30 to shake and bump. This bump will cause the hammer assembly 35 disposed between the two cleaning balls 32 to shake. When the swing spring 44 provided in the hammer assembly 35 is bumped, it will drive the fixed block 43 to swing. The swing of the fixed block will further drive the percussion hammer 45 to collide with the cleaning ball 32, so that the stubborn dirt attached to the surface of the cleaning ball 32 will fall off, achieving the best cleaning effect.

[0052] In addition, the water inlet check valve 21 provided on the inner side of the metal cylinder 18 can achieve the effect of filtering and intercepting. When the water above the cleaning component 30 is filtered and discharged to the outside, since the water discharge volume is less than the water intake volume of the water inlet check valve 21, the water flow close to the side of the inner filter tube 15 will form a negative pressure and the fluidity is slower; while the water flow away from the side of the inner filter tube 15 has a faster fluidity. This difference causes the water flow to form a circulation flow inside the metal cylinder 18. The dirt mixed liquid will eventually climb along the outer wall of the metal cylinder 18 and enter the inside of the metal cylinder 18 from the water inlet check valve 21. Subsequently, these liquids will be intercepted by the inner filter bag 20 to achieve the effect of re-filtration. Finally, the filtered liquid will be discharged from the first drainage check valve 22 and enter the inside of the box 24.

[0053] When the liquid enters the interior of the housing 24, it will first flow into the water collecting chamber 26. As the amount of liquid increases, the water collecting chamber 26 will expand and squeeze the piston plate 27 therein, causing it to descend. The descent of the piston plate will further drive the inclined block plug 38 to descend. When the inclined block plug 38 descends, the baffles on both sides thereof will disengage from the limiting inclined block 37, thereby allowing the water to be discharged from the detached gap. Since the liquid discharged from the water collecting chamber 26 is pressurized, when these pressurized liquids are discharged into the cavity below the cleaning component 30, the cavity will be pressurized and recoiled. This pressurized recoil effect can increase the filtration speed and effectively prevent the occurrence of blockage.

[0054] The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A tubular filter element for a candle filter, comprising an outer filter tube (11), an inner filter tube (15) installed inside the outer filter tube (11), a first fixed annular plate (23) fixedly connected to one end of the inner filter tube (15), a second fixed annular plate (34) fixedly connected to the other end of the inner filter tube (15), a stainless steel filter hole tube (12) fixedly installed on the outer side of the first fixed annular plate (23), a water inlet joint (13) fixedly connected to the end of the stainless steel filter hole tube (12), a drainage joint (14) fixedly connected to the outer side of the second fixed annular plate (34), characterized in that: A cleaning collection device (16) is installed inside the inner filter tube (15), and the cleaning collection device (16) comprises a box body (24), a metal cylinder (18) and a cleaning assembly (30). The metal cylinder (18) is connected to the top of the box body (24), and the cleaning assembly (30) is arranged on the outside of the metal cylinder (18). A plurality of return spring members (17) are fixedly connected to the outside of the cleaning assembly (30), and one end of the return spring member (17) is connected to the inner wall of the first fixed annular plate (23); The cleaning assembly (30) comprises a cleaning plate (31), the outer side of the cleaning plate (31) is fixedly connected to the other end of the return spring member (17), and a second drainage one-way valve (33) is installed on the cleaning plate (31).

2. The tubular filter element for candle filter according to claim 1, characterized in that: A plurality of cleaning balls (32) are arranged in an array at one end of the cleaning plate (31), a U-shaped groove (41) is arranged between each of the two cleaning balls (32) arranged in the array, a fixed bottom plate (42) is fixedly installed in the U-shaped groove (41), and a hammer assembly (35) is fixedly installed on the fixed bottom plate (42); The hammer assembly (35) comprises a swing spring (44), a fixed block (43) and a knock hammer (45), one end of the swing spring (44) is connected to the fixed base plate (42), the other end of the swing spring (44) is connected to the fixed block (43), the knock hammers (45) are fixedly mounted on both sides of the fixed block (43), and the two knock hammers (45) point to the second fixed annular plates (34) corresponding to the two sides.

3. The tubular filter element for candle filter according to claim 2, characterized in that: The other end of the cleaning plate (31) is provided with an arc rubber head (46), the cleaning ball (32) is arranged on one side of the inner filter tube (15), and the arc rubber head (46) is arranged on one side of the metal cylinder (18).

4. The tubular filter element for candle filter according to claim 1, characterized in that: A piston plate (27) is provided inside the box body (24), and the piston plate (27) divides the internal cavity of the box body (24) into an extrusion cavity (25) and a water collecting cavity (26), and the water collecting cavity (26) is arranged above the extrusion cavity (25).

5. The tubular filter element for candle filter according to claim 4, characterized in that: An extrusion spring (28) is fixedly installed inside the extrusion chamber (25), and the extrusion spring (28) is arranged between the piston plate (27) and the bottom wall of the box body (24).

6. The tubular filter element for candle filter according to claim 5, characterized in that: The box body (24) is provided with two water spraying ports, and a drainage device (29) is installed in the water spraying ports. The drainage device (29) comprises a vertical upright plate (36) and an inclined block plug (38). A limiting inclined block (37) is fixedly provided at the end of the vertical upright plate (36), and an inclined block plug (38) is provided below the limiting inclined block (37). Baffles are fixedly provided on two outer inclined surfaces of the inclined block plug (38), and the baffles are in contact with the limiting inclined block (37) to control the water spraying effect of the water spraying port.

7. The tubular filter element for candle filter according to claim 6, characterized in that: A connecting block (39) is fixedly installed below the inclined block plug (38), a connecting rod (40) is fixedly connected to the connecting block (39), and an end of the connecting rod (40) is fixedly connected to the piston plate (27).

8. The tubular filter element for candle filter according to claim 3, characterized in that: The surface of the metal cylinder (18) is provided with a plurality of external protrusions (19) in a vertical array, and the external protrusions (19) are in contact with the arc rubber head (46).

9. The tubular filter element for candle filter according to claim 8, characterized in that: A water inlet check valve (21) is fixedly installed at the open end of the metal cylinder (18), a first water discharge check valve (22) is provided at the connection between the metal cylinder (18) and the box body (24), an inner filter bag (20) is fixedly installed inside the metal cylinder (18), and the inner filter bag (20) is arranged between the water inlet check valve (21) and the first water discharge check valve (22).

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