Filter bag type quick-opening filter

Abstract

The invention discloses a filter bag type quick-opening filter which is characterized in that a mounting hole is provided with a filter cartridge, the filter cartridge is sleeved with a filter bag, a first sealing structure is arranged between a limiting groove and the outer side of a sealing ring, the sealing ring is provided with a pressing ring, a filter layer is arranged between the pressing ring and the sealing ring, and the sealing ring is provided with a guide rod; a first guide hole allowing the guide rod to penetrate through is formed in the pressing ring, the guide rod is sleeved with a spring, the top of the spring abuts against the bottom of the limiting rod, the bottom of the spring abuts against the pressing ring, rotary limiting devices are arranged on the portions, on the two sides of the mounting opening, of the filter plate, and the rotary limiting devices are matched with the two ends, in the length direction, of the limiting rod. And a second sealing structure which is rotationally sealed through the limiting rod is formed between the outer circumferential surface of the sealing ring and the mounting hole. The filter bag fixing device has the advantages of good filter bag fixing effect and convenience in disassembly.

Description

Technical Field

[0001] The invention relates to a filter structure, in particular to a filter bag type quick-opening filter. Background Art

[0002] The bag filter is a multi-purpose filtering equipment with novel structure, small size, convenient and flexible operation, energy saving and high efficiency, closed working and strong applicability. The inside of the bag filter is a filter bag supported by a metal mesh basket and arranged on the outside. The liquid flows in from the inlet, passes through the metal mesh basket, and then flows out from the filter bag after being filtered, intercepting impurities in the filter bag. After filtering for a certain period of time, it can continue to be used by replacing the filter bag.

[0003] In the prior art, a Chinese utility model patent with application number "201020558984.2" discloses a bag filter, in which the filter bag of the bag filter is fixed on the outside of the filter basket structure in a set manner, and then the filter basket is set on the filter plate in the middle of the filter. However, the fixing effect between the filter bag, the filter basket and the filter is poor, so a bag filter with good fixing effect and easy installation and disassembly is needed. Summary of the invention

[0004] The purpose of the present invention is to provide a filter bag type quick-opening filter, which has the advantages of good filter bag fixing effect and convenient disassembly.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: a filter bag type quick-opening filter, comprising a kettle body, a filter plate is arranged on the inner side of the kettle body, a liquid inlet cavity is formed on the kettle body above the filter plate, a liquid outlet cavity is formed on the kettle body below the filter plate, a liquid inlet pipe connected to the liquid inlet cavity is arranged on the kettle body above the filter plate, a liquid outlet pipe connected to the liquid outlet cavity is arranged on the kettle body below the filter plate, mounting holes are evenly distributed on the filter plate, a filter cartridge is arranged on the mounting holes, a filter bag is sleeved on the filter cartridge, an elastic ring is arranged in the opening of the filter bag, the filter cartridge comprises a liquid inlet arranged on the top, a sealing ring is arranged on the liquid inlet, a limiting groove matched with the elastic ring is arranged on the inner side of the liquid inlet of the filter cartridge, and a first sealing groove is arranged between the limiting groove and the outer side of the sealing ring. A sealing structure, a pressure ring is provided on the sealing ring, a filter layer is provided between the pressure ring and the sealing ring, a guide rod is provided on the sealing ring, a first guide hole for the guide rod to pass through is provided on the pressure ring, a limit rod extending in a horizontal direction is provided on the guide rod, a second guide hole for the guide rod to pass through is provided on the limit rod, a limit piece is provided on the top of the limit rod, a spring is sleeved on the guide rod, the top of the spring abuts against the bottom of the limit rod, and the bottom of the spring abuts against the pressure ring, and rotation limit devices are provided on both sides of the mounting port of the filter plate, the rotation limit devices cooperate with both ends of the limit rod in the length direction to limit the rotation and lifting of the limit rod, and a second sealing structure that is rotationally sealed by the limit rod is formed between the outer circumferential surface of the sealing ring and the mounting hole.

[0006] Preferably, an extension tube is concentrically arranged at the bottom of the sealing ring, and the extension tube extends downward along the axial direction of the sealing ring. A first transverse rod is arranged inside the sealing ring, and the top of the guide rod is connected to the top of the first transverse rod. Two guide rods are arranged in parallel on the first transverse rod, and a second transverse rod is arranged inside the pressure ring, and the first guide hole is arranged on the second transverse rod.

[0007] By adopting the above technical solution, the outer ring of the extension tube plays the role of abutting and pressing the liquid inlet of the filter bag, and the first transverse rod and the second transverse rod play the role of fixing the guide rod.

[0008] Preferably, the second sealing structure includes a first thread arranged on the outer circumferential surface of the sealing ring, the bottom of the mounting hole is provided with a step surface that cooperates with the top of the filter cartridge, and a second thread that cooperates with the first thread is provided in the mounting hole. The first thread and the second thread are sealed after rotating 180 degrees.

[0009] By adopting the above technical solution, the first thread and the second thread cooperate to press down and lock the top of the sealing ring.

[0010] Preferably, the first sealing structure includes a guide ring and a limit ring arranged on the outer circumferential surface of the extension tube, the longitudinal section of the limit groove is semicircular, at least two limit grooves are arranged in the height direction of the filter cartridge, the limit groove is concentrically arranged with the filter cartridge, the guide ring and the limit ring are concentrically arranged with the extension tube, the guide ring is arranged between the bottom of the extension tube and the adjacent limit groove, the longitudinal section of the guide ring is a right-angled trapezoid, the limit ring is arranged above the limit groove, and the cross-sectional shape of the limit ring is rectangular.

[0011] By adopting the above technical solution, the cross-sectional shape of the guide ring facilitates the downward pressing of the extension tube on the sealing ring, while the space formed between the limit ring and the guide ring allows the elastic ring to better embed into the limit groove.

[0012] Preferably, a guide column is provided on the top of the sealing ring, a third guide hole cooperating with the guide column is provided on the pressure ring, the guide columns are evenly distributed on the upper surface of the pressure ring, the guide columns extend upward along the axial direction of the filter cartridge, and a fourth guide hole for the guide column to pass through is provided on the filter cloth.

[0013] By adopting the above technical solution, the guide column plays a role in positioning the filter layer in the circumferential direction, and cooperates with the second guide hole to facilitate the installation of the pressure ring.

[0014] Preferably, the rotation limiting device includes a column, a transverse rod and a semicircular groove, the bottom of the column is connected to the top of the filter plate, the top of the column is connected to one end of the transverse rod, the other end of the transverse rod is opened outward, the semicircular groove cooperates with the end of the limiting rod and is arranged at the bottom of the transverse rod, and the column is rotationally symmetrical around the center of the mounting hole.

[0015] By adopting the above technical solution, the end of the limiting rod is embedded in the semicircular groove, and the column is arranged in rotational symmetry, which facilitates the limiting rod to rotate 180 degrees in the horizontal direction.

[0016] Preferably, a mounting port is provided on the top of the kettle body, the mounting port is downwardly connected to the liquid inlet cavity, a cover body is provided on the mounting port, a first flange is provided on the side of the cover body, and a second flange matching the first flange is provided on the side of the mounting port.

[0017] By adopting the above technical solution, the first flange and the second flange play the role of connecting the kettle body and the cover body.

[0018] Preferably, a rotating shaft is rotatably connected to the second flange, a connecting port matching the rotating shaft is provided on the first flange, a lifting ring is threadedly connected to the top of the rotating shaft, and a sealing ring is provided between the first flange and the second flange.

[0019] By adopting the above technical solution, the top of the rotating shaft is quickly connected to the lifting ring, and the sealing ring is pressed tightly, thereby achieving the effect of quick connection and sealing.

[0020] Preferably, an exhaust pipe is provided on the top of the cover body, and a vent pipe is provided on the bottom of the kettle body.

[0021] To sum up, firstly, the filter bag is locked in the filter cartridge by the elastic ring, which plays the role of quickly fixing the filter bag, sealing and tightening the filter bag;

[0022] Second, by providing a first sealing structure between the filter cartridge liquid inlet and the sealing ring, it cooperates with the elastic ring to play a role of sealing and fastening;

[0023] Third, after the fluid enters the kettle through the liquid inlet pipe, it is first filtered through the filter layer, and then filtered twice through the filter bag on the filter cartridge;

[0024] Fourth, the rotation limit device cooperates with the limit rod, and under the action of the compression spring, the sealing ring is pressed downward to close the liquid inlet of the filter bag, which plays a role in fixing the filter bag. At the same time, combined with the action process of the spring pressing downward, the spring acts on the pressure ring at the same time to fix the filter layer;

[0025] Fifth, during the rotational locking action of the rotation limit device, the limit rod is not only for the operator to hold, but the linkage process of the limit rod not only plays the role of pressing down the spring and synchronously fixing the filter bag and the filter layer, and in the process of downward rotation, it not only buckles into the semicircular groove of the transverse rod, but also cooperates with the second sealing structure to play the role of threaded pressure fixing the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a cross-sectional schematic diagram of an embodiment;

[0027] Figure 2 yes Figure 1 An enlarged schematic diagram of part A is shown;

[0028] Figure 3 yes Figure 1 The enlarged schematic diagram of part B is shown;

[0029] Figure 4 It is a schematic diagram of the structure of the embodiment at the filter cartridge position;

[0030] In the figure, 1, kettle body; 11, liquid inlet cavity; 12, liquid outlet cavity; 13, liquid inlet pipe; 14, liquid outlet pipe; 15, installation port; 151, cover body; 152, first flange; 153, connecting port; 154, second flange; 155, rotating shaft; 156, lifting ring; 157, sealing ring; 16, exhaust pipe; 17, vent pipe; 2, filter plate; 21, installation hole; 22, second thread; 3, filter cartridge; 31, liquid inlet; 32, sealing ring; 321, first thread; 33. Limiting groove; 34. Extension tube; 35. Guide ring; 36. Limiting ring; 37. First transverse rod; 38. Guide column; 4. Filter bag; 41. Elastic ring; 51. Pressing ring; 52. Third guide hole; 53. Filter layer; 54. Fourth guide hole; 55. Second transverse rod; 56. First guide hole; 61. Guide rod; 62. Limiting rod; 63. Second guide hole; 64. Limiting piece; 65. Spring; 66. Column; 67. Transverse rod; 68. Semicircular groove. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0032] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0033] Example:

[0034] like Figures 1 to 4 As shown, a filter bag type quick-opening filter, the overall structure of the filter is, including a kettle body 1, the bottom of the kettle body 1 is supported by a bracket, a filter plate 2 is arranged above the inside of the kettle body 1, the kettle body 1 is formed with a liquid inlet cavity 11 above the filter plate 2, the kettle body 1 is a liquid outlet cavity 12 below the filter plate 2, the kettle body 1 is provided with a liquid inlet pipe 13 connected with the liquid inlet cavity 11 above the filter plate 2, the liquid inlet pipe 13 is arranged on the side of the kettle body 1, the kettle body 1 is provided with a liquid outlet pipe 14 connected with the liquid outlet cavity 12 below the filter plate 2, and the liquid outlet pipe 14 is arranged at the bottom of the kettle body 1 , and is bent in the horizontal direction. A mounting port 15 is provided on the top of the kettle body 1 above the filter plate 2. The mounting port 15 is downwardly connected to the liquid inlet chamber 11. A cover body 151 is provided on the mounting port 15. The cover body 151 is connected through a cantilever on the side of the kettle body 1. A first flange 152 is provided on the side of the bottom of the cover body 151. A second flange 154 matching the first flange 152 is provided on the side of the mounting port 15. An exhaust pipe 16 for exhausting the kettle body 1 is provided on the top of the cover body 151, and a vent pipe 17 is provided at the bottom of the kettle body 1.

[0035] like Figure 1 and Figure 3As shown, a rotating shaft 155 is rotatably connected to the second flange 154, a connecting port 153 cooperating with the rotating shaft 155 is provided on the first flange 152, a hanging ring 156 is threadedly connected to the top of the rotating shaft 155, a sealing ring 157 is provided between the first flange 152 and the second flange 154, and the sealing ring 157 is concentrically arranged with the kettle body 1. During the fixing process, the bottom of the rotating shaft 155 and the second flange 154 are rotated by the pin shaft. When the rotating shaft 155 is rotated to a vertical state, the first flange 152 is locked on the second flange 154 by rotating the hanging ring 156, so as to achieve the fixation between the cover body 151 and the kettle body 1.

[0036] like Figure 1 , Figure 2 and Figure 4 As shown, the filter plate 2 is evenly distributed with mounting holes 21, which are arranged in steps. A filter cartridge 3 is arranged on the mounting hole 21, and a filter bag 4 is arranged on the outer sleeve of the filter cartridge 3. An elastic ring 41 is arranged in the opening of the filter bag 4. The elastic ring 41 referred to in the embodiment is a rubber telescopic rope, and two elastic rings 41 are arranged at the opening position of the filter bag 4. The filter cartridge 3 includes a liquid inlet 31 arranged at the top of the filter cartridge 3, and a sealing ring 32 is arranged on the liquid inlet 31. A limiting groove 33 cooperating with the elastic ring 41 is arranged on the inner side of the liquid inlet 31 of the filter cartridge 3, and a first sealing structure is arranged between the limiting groove 33 and the outer side of the sealing ring 32.

[0037] like Figure 2 As shown, the first sealing structure plays a role in sealing and fixing the opening position of the filter bag 4. The first sealing structure includes a guide ring 35 and a limit ring 36 arranged on the outer circumferential surface of the extension tube 34. The longitudinal section of the limit groove 33 is semicircular. The limit groove 33 is provided with at least two in the height direction of the filter cartridge 3. The limit groove 33 is concentrically arranged with the filter cartridge 3. The guide ring 35 and the limit ring 36 are concentrically arranged with the extension tube 34. The guide ring 35 is arranged between the bottom of the extension tube 34 and the adjacent limit groove 33. The longitudinal section of the guide ring 35 is a right-angled trapezoid. The limit ring 36 is arranged above the limit groove 33. The cross-sectional shape of the limit ring 36 is rectangular. When one side of the elastic ring 41 is embedded in the limit groove 33, the other side of the elastic ring 41 is limited by the guide ring 35 and the limit ring 36.

[0038] like Figure 2 and Figure 4 As shown, an extension tube 34 is concentrically arranged at the bottom of the sealing ring 32, a limiting groove 33 is arranged on the outer wall of the extension tube 34, the extension tube 34 is concentrically arranged with the sealing ring 32, the extension tube 34 extends downward along the axial direction of the sealing ring 32, a first transverse rod 37 is radially arranged inside the sealing ring 32, a pressure ring 51 is arranged directly above the sealing ring 32, and a second transverse rod 55 is arranged inside the pressure ring 51.

[0039] like Figure 4As shown, in order to achieve compression and fixation of the sealing ring 32, a guide rod 61 is provided on the sealing ring 32, the top of the guide rod 61 is connected to the top of the first transverse rod 37, two guide rods 61 are arranged in parallel on the first transverse rod 37, a limit rod 62 extending in the horizontal direction is provided on the guide rod 61, and a second guide hole 63 for the guide rod 61 to pass through is provided on the limit rod 62. A limit member 64 is provided on the top of the limit rod 62 of the guide rod 61, and the limit member 64 is a nut, which plays the role of locking the maximum stroke of the limit rod 62. A spring 65 is sleeved on the guide rod 61, and the top of the spring 65 abuts against the bottom of the limit rod 62. The bottom abuts against the pressure ring 51, and the filter plate 2 is provided with a rotation limit device on both sides of the installation port 15. The rotation limit device cooperates with the two ends of the limit rod 62 in the length direction to limit the rotation and lifting of the limit rod 62. The rotation limit device includes a column 66, a transverse rod 67 and a semicircular groove 68. The rotation limit device is rotationally symmetrical around the center of the installation hole 21. The bottom of the column 66 is connected to the top of the filter plate 2, the top of the column 66 is connected to one end of the transverse rod 67, and the other end of the transverse rod 67 is opened outward. The semicircular groove 68 cooperates with the end of the guide rod 61 and is arranged at the bottom of the transverse rod 67. The column 66 is rotationally symmetrical around the center of the installation hole 21.

[0040] like Figure 2 and Figure 4 As shown, a second sealing structure is formed between the outer circumferential surface of the sealing ring 32 and the mounting hole 21, which is sealed by the limiting rod 62. During the rotation of the limiting rod 62, the second sealing structure simultaneously plays a locking role. The second sealing structure includes a first thread 321 arranged on the outer circumferential surface of the sealing ring 32, and the bottom of the mounting hole 21 is provided with a step surface that cooperates with the top of the filter cartridge 3. A second thread 22 that cooperates with the first thread 321 is provided in the mounting hole 21. The first thread 321 and the second thread 22 are sealed after rotating 180 degrees.

[0041] A secondary filtration is formed at the position of the filter cartridge 3, and a pressure ring 51 is arranged on the top of the sealing ring 32. A filter layer 53 is arranged between the pressure ring 51 and the sealing ring 32. The filter layer 53 is a filter cloth. A first guide hole 56 for the guide rod 61 to pass through is arranged on the pressure ring 51, that is, the first guide hole 56 is arranged on the second transverse rod 55; at the same time, in order to improve the fixing effect of the filter layer 53, a guide column 38 is arranged on the top of the sealing ring 32, and a third guide hole 52 cooperating with the guide column 38 is arranged on the pressure ring 51. The guide columns 38 are evenly distributed on the upper surface of the pressure ring 51, and the guide columns 38 extend upward along the axial direction of the filter cartridge 3, and a fourth guide hole 54 for the guide column 38 to pass through is arranged on the filter cloth.

[0042] Working principle:

[0043] During the installation of the filter cartridge 3, the fourth guide hole 54 around the filter layer 53 is passed through the guide column 38, and then the third guide hole 52 on the pressure ring 51 is aligned with the guide column 38, and at the same time, the first guide hole 56 on the pressure ring 51 is installed corresponding to the guide rod 61, and after the spring 65 is inserted, the guide rod 61 is passed through the limit rod 62, and finally the top of the guide rod 61 is locked and limited by the nut; the filter bag 4 is put on the filter cartridge 3, and the elastic ring 41 at the opening position of the filter bag 4 is buckled into the position of the liquid inlet 31 of the filter cartridge 3, The filter cartridge 3 is installed into the installation opening 15 so that the limiting groove 33 is engaged with the elastic ring 41. By pressing down the limiting rod 62 and the spring 65, the limiting rod 62 is close to the column 66 and rotated 180 degrees clockwise to lock the first thread 321 into the second thread 22 to achieve outer sealing. At the same time, the guide ring 35, the limiting ring 36, the elastic ring 41 and the limiting groove 33 achieve inner sealing. The limiting rod 62 is limited in height by the transverse rod 67. Under the action of the spring 65, the pressure ring 51 is pressed against the filter layer 53.

Claims

1. A filter bag type quick-opening filter, comprising a kettle body (1), characterized in that: A filter plate (2) is arranged on the inner side of the kettle body (1); a liquid inlet cavity (11) is formed on the kettle body (1) above the filter plate (2); a liquid outlet cavity (12) is formed on the kettle body (1) below the filter plate (2); a liquid inlet pipe (13) communicating with the liquid inlet cavity (11) is arranged on the kettle body (1) above the filter plate (2); a liquid outlet pipe (14) communicating with the liquid outlet cavity (12) is arranged on the kettle body (1) below the filter plate (2); mounting holes (21) are evenly distributed on the filter plate (2); and mounting holes (21) are arranged on the mounting holes (21). A filter cartridge (3) is provided, a filter bag (4) is sleeved on the filter cartridge (3), an elastic ring (41) is provided in the opening of the filter bag (4), the filter cartridge (3) comprises a liquid inlet (31) provided at the top, a sealing ring (32) is provided on the liquid inlet (31), a limiting groove (33) cooperating with the elastic ring (41) is provided on the inner side of the liquid inlet (31) of the filter cartridge (3), a first sealing structure is provided between the limiting groove (33) and the outer side of the sealing ring (32), and a pressure ring (51) is provided on the sealing ring (32) A filter layer (53) is provided between the pressure ring (51) and the sealing ring (32); a guide rod (61) is provided on the sealing ring (32); a first guide hole (56) is provided on the pressure ring (51) for the guide rod (61) to pass through; a limit rod (62) extending in a horizontal direction is provided on the guide rod (61); a second guide hole (63) is provided on the limit rod (62) for the guide rod (61) to pass through; a limit member (64) is provided on the top of the limit rod (62); A spring (65) is sleeved on the guide rod (61), the top of the spring (65) abuts against the bottom of the limiting rod (62), and the bottom of the spring (65) abuts against the pressure ring (51). The filter plate (2) is provided with rotation limiting devices on both sides of the mounting opening (15), and the rotation limiting devices cooperate with the two ends of the limiting rod (62) in the length direction to limit the rotation and lifting of the limiting rod (62). A second sealing structure is formed between the outer circumferential surface of the sealing ring (32) and the mounting hole (21), which is rotationally sealed by the limiting rod (62).

2. The filter bag type quick-opening filter according to claim 1, characterized in that: An extension tube (34) is concentrically arranged at the bottom of the sealing ring (32), and the extension tube (34) extends downwardly along the axial direction of the sealing ring (32). A first transverse rod (37) is arranged inside the sealing ring (32), and the top of the guide rod (61) is connected to the top of the first transverse rod (37). Two guide rods (61) are arranged in parallel on the first transverse rod (37). A second transverse rod (55) is arranged inside the pressure ring (51), and the first guide hole (56) is arranged on the second transverse rod (55).

3. The filter bag type quick-opening filter according to claim 2, characterized in that: The second sealing structure comprises a first thread (321) arranged on the outer circumferential surface of the sealing ring (32); the bottom of the mounting hole (21) is provided with a step surface that matches with the top of the filter cartridge (3); a second thread (22) that matches with the first thread (321) is provided in the mounting hole (21); the first thread (321) and the second thread (22) are sealed after being rotated 180 degrees.

4. The filter bag type quick-opening filter according to claim 3, characterized in that: The first sealing structure comprises a guide ring (35) and a limit ring (36) arranged on the outer circumferential surface of the extension tube (34); the longitudinal section of the limit groove (33) is semicircular; at least two limit grooves (33) are arranged in the height direction of the filter cartridge (3); the limit groove (33) is arranged concentrically with the filter cartridge (3); the guide ring (35) and the limit ring (36) are arranged concentrically with the extension tube (34); the guide ring (35) is arranged at the bottom of the extension tube (34) and between the adjacent limit grooves (33); the longitudinal section of the guide ring (35) is a right-angled trapezoid; the limit ring (36) is arranged above the limit groove (33); the cross-sectional shape of the limit ring (36) is rectangular.

5. The filter bag type quick-opening filter according to claim 2, characterized in that: A guide column (38) is arranged on the top of the sealing ring (32), a third guide hole (52) cooperating with the guide column (38) is arranged on the pressure ring (51), the guide columns (38) are evenly distributed on the upper surface of the pressure ring (51), the guide columns (38) extend upward along the axial direction of the filter cartridge (3), and a fourth guide hole (54) for the guide column (38) to pass through is arranged on the filter cloth.

6. The filter bag type quick opening filter according to claim 3, characterized in that: The rotation limiting device comprises a column (66), a transverse rod (67) and a semicircular groove (68); the bottom of the column (66) is connected to the top of the filter plate (2); the top of the column (66) is connected to one end of the transverse rod (67); the other end of the transverse rod (67) is opened outward; the semicircular groove (68) cooperates with the end of the limiting rod (62) and is arranged at the bottom of the transverse rod (67); the column (66) is rotationally symmetrical around the center of the mounting hole (21).

7. The filter bag type quick opening filter according to claim 1, characterized in that: The top of the kettle body (1) is provided with a mounting opening (15), the mounting opening (15) is downwardly connected to the liquid inlet cavity (11), a cover body (151) is provided on the mounting opening (15), a first flange (152) is provided on the side of the cover body (151), and a second flange (154) matching with the first flange (152) is provided on the side of the mounting opening (15).

8. The filter bag type quick-opening filter according to claim 7, characterized in that: The second flange (154) is rotatably connected to a rotating shaft (155); the first flange (152) is provided with a connecting port (153) that cooperates with the rotating shaft (155); the top of the rotating shaft (155) is threadedly connected to a hanging ring (156); and a sealing ring (157) is provided between the first flange (152) and the second flange (154).

9. The filter bag type quick opening filter according to claim 7, characterized in that: An exhaust pipe (16) is provided at the top of the cover body (151), and a vent pipe (17) is provided at the bottom of the kettle body (1).

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