Aeration tank for sewage treatment

Abstract

The application discloses an aeration tank for sewage treatment and relates to the technical field of sewage treatment.The aeration tank comprises a tank body, a horizontal reciprocating moving mechanism and an aeration mechanism.The tank body is connected with a guide rail through a depth adjusting mechanism at the top.The guide rail is connected with a sliding seat through sliding connection.The bottom outer wall of the sliding seat is fixedly connected with a box.The aeration mechanism comprises a rotary driving assembly, a pipeline switching assembly, a water and air dual-purpose pump, a rotary pipe, an aeration head, an agitating impeller and a cleaning and anti-blocking assembly.The cleaning and anti-blocking assembly can automatically clean the inner wall of the aeration head in a continuous rotating state, thereby effectively avoiding the serious blocking of the air holes of the aeration head.The horizontal reciprocating moving mechanism can expand the aeration range of the aeration head and can uniformly distribute the aeration air into the sewage, thereby effectively improving the oxygenation effect of the sewage.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewage treatment technical field, especially to a sewage treatment aeration tank. BACKGROUND

[0002] The aeration tank is a device for sewage treatment by using the activated sludge method, air or oxygen is continuously introduced into the aeration tank to meet the oxygen demand of aerobic microorganisms, and the sewage stays in the aeration tank for a period of time, so that the oxygen, activated sludge and sewage in the aeration tank are fully contacted, thereby producing flocculation, which is convenient for sedimentation in the subsequent water treatment step. The existing aeration tank has the following problems in actual use:

[0003] Firstly, the flowability of the sewage in the aeration process is poor, which leads to a low oxygen dissolution rate in the aeration process, and the air holes on the surface of the aeration head are prone to be blocked, thereby affecting the aeration efficiency;

[0004] Secondly, the aeration head position is fixed, and the aeration treatment can only be carried out in one area, the aeration range is small, and the aeration air cannot be evenly distributed in the sewage, thereby leading to poor oxygenation effect of the sewage. SUMMARY

[0005] In view of the shortcomings of the prior art, the present application provides a sewage treatment aeration tank, which effectively solves the problems of the prior art that the flowability of the sewage in the aeration process is poor, which leads to a low oxygen dissolution rate in the aeration process, and the air holes on the surface of the aeration head are prone to be blocked, thereby affecting the aeration efficiency, and solves the problem that the aeration head position is fixed, the aeration treatment can only be carried out in one area, the aeration range is small, and the aeration air cannot be evenly distributed in the sewage, thereby leading to poor oxygenation effect of the sewage.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] A sewage treatment aeration tank, comprising a tank body, a horizontal reciprocating movement mechanism and an aeration mechanism, the top of the tank body is connected with a guide rail through a depth adjusting mechanism, a sliding seat is slidably connected on the guide rail, and a box body is fixedly connected to the bottom outer wall of the sliding seat;

[0008] The aeration mechanism comprises a rotary drive assembly, a pipeline adapter assembly, a water and gas dual-purpose pump fixedly installed on the rear outer wall of the sliding seat, a rotary pipe rotatably connected with the bottom of the box body, an aeration head concentrically fixedly connected to the bottom end of the rotary pipe, an impeller concentrically fixedly connected to the bottom of the aeration head, and a cleaning and anti-blocking assembly arranged in the aeration head;

[0009] The rotating driving assembly comprises a driving motor fixedly installed on the side wall of the box, a driving bevel gear fixedly sleeved on the output shaft of the driving motor and a driven bevel gear fixedly sleeved on the upper portion of the rotating pipe.

[0010] The cleaning anti-blocking assembly comprises a fixing frame connected with the outer wall of the rotating pipe through a connecting bearing, a brush roller rotatably installed on the fixing frame, a first spur gear fixedly sleeved on the lower portion of the rotating pipe and a second spur gear fixedly sleeved on the top end of the brush roller and engaged with the first spur gear.

[0011] As a preferred technical solution of the present application, the output shaft of the driving motor extends into the box, and the driving bevel gear and the driven bevel gear are engaged with each other and located in the box.

[0012] As a preferred technical solution of the present application, the pipeline switching assembly comprises a rotating joint and a tee joint, the rotating end of the rotating joint extends into the box and is sealingly and fixedly communicated with the top end of the rotating pipe, the fixed end of the rotating joint is sealingly and fixedly communicated with one end of the pipeline tee joint, the other two ends of the tee joint are sealingly and fixedly communicated with the air charging end and the liquid feeding end of the water-gas dual-purpose pump through pipelines respectively, and the other two ends of the tee joint are respectively provided with an air charging electromagnetic valve and a liquid feeding electromagnetic valve.

[0013] As a preferred technical solution of the present application, the top outer wall of the sliding seat is fixedly installed with a medicament storage tank, and the liquid pumping end of the water-gas dual-purpose pump is fixedly communicated with the medicament storage tank through a pipeline, the top of the medicament storage tank is provided with a filling pipe, and a sealing cover is threadedly connected to the filling pipe.

[0014] As a preferred technical solution of the present application, the surface of the aeration head is provided with uniformly distributed air holes, the lower portion of the rotating pipe is installed with a one-way valve, and the brush roller is in contact with the inner wall of the aeration head.

[0015] As a preferred technical solution of the present application, the horizontal reciprocating movement mechanism comprises a rack fixedly connected to the top outer wall of the guide rail, a first stepping motor fixedly installed on the front outer wall of the sliding seat and a transmission gear fixedly sleeved on the output shaft of the first stepping motor, the output shaft of the first stepping motor penetrates through the front edge of the sliding seat, and the transmission gear is engaged with the rack.

[0016] As a preferred technical solution of the present application, the depth adjusting mechanism comprises two symmetrically distributed threaded lifting assemblies, and each threaded lifting assembly comprises a hollow shell welded to the side wall of the pool body, a lead screw rotatably installed in the hollow shell, a lifting rod threadedly connected to the lead screw, a fixed cover fixedly connected to the side wall of the hollow shell, a second stepping motor fixedly installed on the top outer wall of the fixed cover, a driving synchronous wheel fixedly sleeved on the output shaft of the second stepping motor and a driven synchronous wheel fixedly sleeved on the lower portion of the lead screw.

[0017] As a preferred technical scheme of the present application, the output shaft of the second stepper motor penetrates through the top of the fixed cover, and the driving synchronous wheel and the driven synchronous wheel are connected by the same synchronous belt.

[0018] As a preferred technical scheme of the present application, the top of the hollow shell is provided with a lifting slide, the outer wall of the lifting rod is in sliding connection with the inner wall of the lifting slide, and the top end outer wall of the lifting rod is welded to the bottom outer wall of the guide rail.

[0019] As a preferred technical scheme of the present application, the upper outer wall of the pool body is fixed with a total controller through a support plate, the lower part of the pool body is fixedly connected with a discharge pipe, and a discharge electromagnetic valve is installed on the discharge pipe.

[0020] The present application has the following advantages:

[0021] 1. The present application can rotate the aeration head and the stirring impeller in the pool body, thereby being capable of aeration and oxygen supply to the sewage and stirring, which is beneficial to the turbulent flow and circulation flow of the sewage, facilitates the breaking and refining of the air bubbles in the air, thereby improving the oxygen dissolution rate in the aeration process, and the stirring is also beneficial to the mixing efficiency of the reagent and the sewage in the subsequent reagent spraying process.

[0022] 2. The present application can flexibly switch between aeration and reagent spraying work through the cooperation of the water-air pump, the inflation electromagnetic valve and the liquid sending electromagnetic valve, improves the diversity of sewage treatment, and the aeration holes with the porous structure can uniformly diffuse the gas or the liquid medicine into the sewage when rotating.

[0023] 3. The cleaning and anti-blocking assembly of the present application can automatically clean the inner wall of the aeration head in the continuous rotating state, thereby effectively avoiding the serious blockage of the air holes of the aeration head.

[0024] 4. The present application is provided with a horizontal reciprocating movement mechanism, which drives the transmission gear to execute forward and reverse rotation through the first stepper motor, and then the sliding seat moves horizontally along the guide rail under the meshing transmission of the transmission gear and the rack, thereby being capable of expanding the aeration range of the aeration head, uniformly distributing the aeration air into the sewage, and effectively improving the oxygenation effect of the sewage.

[0025] 5. The present application is provided with a depth adjusting mechanism, which can flexibly adjust the aeration depth and the stirring position of the stirring impeller, thereby being capable of better ensuring the sufficient mixing of the sludge, the sewage and the oxygen in different depth levels, and improving the sewage treatment efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the specific embodiments or the prior art of the present application, the drawings required to be used in the specific embodiments or the prior art description will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual proportions.

[0027] Figure 1 is a schematic diagram of the three-dimensional structure of the present application;

[0028] Figure 2 is a schematic diagram of the vertical cross-sectional structure of the pool body in the present application;

[0029] Figure 3 is a schematic diagram of the three-dimensional enlarged structure of the connection between the rotating pipe, the aeration head and the stirring blade in the present application;

[0030] Figure 4 is a schematic diagram of the vertical cross-sectional structure of the aeration head in the present application;

[0031] Figure 5 is a schematic diagram of the three-dimensional enlarged structure of the cleaning and anti-blocking assembly in the present application;

[0032] Figure 6 is a schematic diagram of the three-dimensional enlarged structure of the local part of the present application;

[0033] Figure 7 is a schematic diagram of the front view structure of the present application; Figure 6

[0034] Figure 8 is a schematic diagram of the three-dimensional enlarged structure of the horizontal reciprocating movement mechanism in the present application;

[0035] Figure 9 is a schematic diagram of the vertical cross-sectional structure of the threaded lifting assembly in the present application;

[0036] Figure 10 is a schematic diagram of the three-dimensional enlarged structure of the local part of the threaded lifting assembly in the present application.

[0037] In the drawings: 1, pool body; 2, guide rail; 3, sliding seat; 4, box body; 5, water and air dual-purpose pump; 6, rotating pipe; 7, aeration head; 8, stirring impeller; 9, driving motor; 10, driving bevel gear; 11, driven bevel gear; 12, rotating joint; 13, three-way joint; 14, medicament storage box; 15, air hole; 16, fixing frame; 17, brush roller; 18, first spur gear; 19, second spur gear; 20, rack; 21, first stepper motor; 22, transmission gear; 23, hollow shell; 24, lead screw; 25, lifting rod; 26, fixing cover; 27, second stepper motor; 28, driving synchronous pulley; 29, driven synchronous pulley; 30, synchronous belt; 31, total controller; 32, discharge pipe.​ DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application.

[0039] Embodiment 1, refer to Figures 1-7 The sewage treatment aeration tank comprises a tank body 1, a horizontal reciprocating movement mechanism and an aeration mechanism, a total controller 31 is fixed on the upper outer wall of the tank body 1 through a support plate, the total controller 31 can control the operation of all electrical elements in the present application, a discharge pipe 32 is fixedly connected to the lower part of the tank body 1, a discharge electromagnetic valve is installed on the discharge pipe 32, after the sewage treatment is completed, the sewage in the tank body 1 can be automatically discharged by starting the discharge electromagnetic valve;

[0040] In the present embodiment, a guide rail 2 is connected to the upper part of the tank body 1 through a depth adjusting mechanism, a sliding seat 3 is slidingly connected to the guide rail 2, and a box body 4 is fixedly connected to the bottom outer wall of the sliding seat 3;

[0041] Specifically, the aeration mechanism comprises a rotary drive assembly, a pipeline adapter assembly, a water and air dual-purpose pump 5 fixedly installed on the outer wall of the rear side of the sliding seat 3, a rotary pipe 6 rotationally connected to the bottom of the box body 4, an aeration head 7 concentrically and fixedly connected to the bottom end of the rotary pipe 6, an impeller 8 concentrically and fixedly connected to the bottom of the aeration head 7, and a cleaning and anti-blocking assembly arranged in the aeration head 7;

[0042] Further, the rotary drive assembly comprises a drive motor 9 fixedly installed on the side wall of the box body 4, a driving bevel gear 10 fixedly sleeved on the output shaft of the drive motor 9, and a driven bevel gear 11 fixedly sleeved on the upper part of the rotary pipe 6, the output shaft of the drive motor 9 extends through the box body 4, and the driving bevel gear 10 and the driven bevel gear 11 are in meshing relationship and are located in the box body 4;

[0043] Further, the cleaning and anti-blocking assembly comprises a fixing frame 16 connected to the outer wall of the rotary pipe 6 through a connecting bearing, a brush roller 17 rotationally installed on the fixing frame 16, a first spur gear 18 fixedly sleeved on the lower part of the rotary pipe 6, and a second spur gear 19 fixedly sleeved on the top end of the brush roller 17 and in meshing relationship with the first spur gear 18;

[0044] Further, the pipeline adapter assembly comprises a rotary joint 12 and a three-way joint 13, the rotary end of the rotary joint 12 penetrates into the box body 4 and is in sealed and fixed communication with the top end of the rotary pipe 6, the fixed end of the rotary joint 12 is in sealed and fixed communication with one end of the pipeline three-way joint 13, the other two ends of the three-way joint 13 are in sealed and fixed communication with the air charging end and the liquid feeding end of the water and air dual-purpose pump 5 through pipelines respectively, and the other two ends of the three-way joint 13 are respectively provided with an air charging electromagnetic valve and a liquid feeding electromagnetic valve;

[0045] Further, the top outer wall of the sliding seat 3 is fixedly provided with a medicament storage tank 14, the liquid suction end of the water-air dual-purpose pump 5 is fixedly communicated with the medicament storage tank 14 through a pipeline, the top of the medicament storage tank 14 is provided with a filling pipe, a sealing cover is threadedly connected to the filling pipe, the required sewage treatment medicament can be added into the medicament storage tank 14 through the filling pipe by opening the sealing cover, the surface of the aerator head 7 is provided with uniformly distributed air holes 15, the lower part of the rotating pipe 6 is provided with a one-way valve, and the brush roller 17 is in contact with the inner wall of the aerator head 7;

[0046] The use mode of the embodiment is as follows: firstly, the driving motor 9 drives the driving bevel gear 10 to rotate, then the driven bevel gear 11 engaged with the driving bevel gear 10 drives the rotating pipe 6 to rotate, and then the aerator head 7 at the bottom end of the rotating pipe 6 and the stirring impeller 8 rotate together; secondly, the air charging electromagnetic valve is started and air charging is performed through the air charging end of the water-air dual-purpose pump 5, the gas enters into the rotating pipe 6 through the rotating joint 12, and then diffuses out of the uniformly distributed air holes 15 on the surface of the aerator head 7 to aerate and oxygenate the sewage, and when it is necessary to spray the medicament, the air charging electromagnetic valve is closed and the liquid feeding electromagnetic valve is started, at this time, the water-air dual-purpose pump 5 is automatically switched to the water pumping mode, and then the medicament in the medicament storage tank 14 can be pumped out and fed into the rotating pipe 6 through the rotating joint 12, and then diffused into the sewage through the uniformly distributed air holes 15 on the surface of the aerator head 7 for treatment; finally, since the fixed frame 16 is connected to the outer wall of the rotating pipe 6 through the connecting bearing, the fixed frame 16 does not rotate when the rotating pipe 6 rotates, but the first spur gear 18 rotates, and then the second spur gear 19 engaged with the first spur gear 18 drives the brush roller 17 to rotate, and then the inner wall of the aerator head 7 in the continuous rotating state can be automatically cleaned, so that the air holes 15 of the aerator head 7 are effectively prevented from being seriously blocked;

[0047] In summary: the embodiment can aerate and oxygenate the sewage and also stir the sewage, the stirring is beneficial to make the sewage produce violent turbulent flow and circulating flow, facilitates the air bubbles in the air to be broken and refined, thereby improving the oxygen dissolution rate in the aeration process, and the stirring is also beneficial to improve the mixing efficiency of the medicament and the sewage in the medicament spraying process.

[0048] Embodiment 2, refer to Figure 1 and Figure 8 The embodiment is optimized on the basis of the embodiment 1, specifically: the horizontal reciprocating movement mechanism comprises a rack 20 fixedly connected to the top outer wall of the guide rail 2, a first stepping motor 21 fixedly installed on the front outer wall of the sliding seat 3, and a transmission gear 22 fixedly sleeved on the output shaft of the first stepping motor 21, the output shaft of the first stepping motor 21 penetrates through the front edge of the sliding seat 3, and the transmission gear 22 is engaged with the rack 20;

[0049] The use mode of the embodiment is: the transmission gear 22 is driven to rotate reversely and forwardly by the first stepping motor 21, then the sliding seat 3 moves horizontally along the guide rail 2 under the meshing transmission of the transmission gear 22 and the rack 20, so that the aeration range of the aeration head 7 can be expanded, the aeration air can be evenly distributed in the sewage, and the oxygenation effect of the sewage is effectively improved.

[0050] Embodiment 3, refer to Figure 2 and Figures 9-10 The embodiment is optimized on the basis of the embodiment 1, specifically: the depth adjusting mechanism comprises two symmetrically distributed screw lifting assemblies, each screw lifting assembly comprises a hollow shell 23 welded to the side wall of the pool body 1, a lead screw 24 rotatably installed in the hollow shell 23, a lifting rod 25 screw-connected to the lead screw 24, a fixed cover 26 fixedly connected to the side wall of the hollow shell 23, a second stepping motor 27 fixedly installed on the top outer wall of the fixed cover 26, a driving synchronous pulley 28 fixedly sleeved on the output shaft of the second stepping motor 27, and a driven synchronous pulley 29 fixedly sleeved on the lower part of the lead screw 24.

[0051] Further, the output shaft of the second stepping motor 27 penetrates the top of the fixed cover 26, the driving synchronous pulley 28 and the driven synchronous pulley 29 are drivingly connected through the same synchronous belt 30, the top of the hollow shell 23 is provided with a lifting slide, the outer wall of the lifting rod 25 is slidingly connected with the inner wall of the lifting slide, and the top end outer wall of the lifting rod 25 is welded to the bottom outer wall of the guide rail 2.

[0052] The use mode of the embodiment is: the transmission gear 22 is driven to rotate reversely and forwardly by the first stepping motor 21, then the sliding seat 3 moves horizontally along the guide rail 2 under the meshing transmission of the transmission gear 22 and the rack 20, so that the aeration range of the aeration head 7 can be expanded, the aeration air can be evenly distributed in the sewage, and the oxygenation effect of the sewage is effectively improved.

[0053] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device.

[0054] The above description is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art within the technical range disclosed by the present application, according to the technical solution and inventive concept of the present application, makes equivalent replacement or change, which should be covered within the protection scope of the present application.

Claims

1. An aeration tank for wastewater treatment, comprising a tank body (1), characterized in that, It also includes a horizontal reciprocating movement mechanism and an aeration mechanism. The upper part of the pool body (1) is connected to a guide rail (2) through a depth adjustment mechanism. A sliding seat (3) is slidably connected on the guide rail (2), and a box body (4) is fixedly connected to the bottom outer wall of the sliding seat (3). The aeration mechanism includes a rotary drive assembly, a pipe adapter assembly, a water-air dual-purpose pump (5) fixedly installed on the outer wall of the rear side of the sliding seat (3), a rotary pipe (6) rotatably connected to the bottom of the box (4), an aeration head (7) concentrically fixedly connected to the bottom end of the rotary pipe (6), a stirring impeller (8) concentrically fixedly connected to the bottom of the aeration head (7), and a cleaning and anti-clogging assembly provided in the aeration head (7); The rotary drive assembly includes a drive motor (9) fixedly installed on the side wall of the housing (4), a driving bevel gear (10) fixedly mounted on the output shaft of the drive motor (9), and a driven bevel gear (11) fixedly mounted on the upper part of the rotary tube (6). The cleaning and anti-clogging assembly includes a fixed frame (16) connected to the outer wall of the rotating tube (6) via a connecting bearing, a brush roller (17) rotatably mounted on the fixed frame (16), a first spur gear (18) fixedly mounted on the lower part of the rotating tube (6), and a second spur gear (19) fixedly mounted on the top of the brush roller (17) and meshing with the first spur gear (18).

2. The aeration tank for wastewater treatment according to claim 1, characterized in that, The output shaft of the drive motor (9) extends through into the housing (4), and the driving bevel gear (10) and the driven bevel gear (11) mesh with each other and are both located inside the housing (4).

3. The aeration tank for wastewater treatment according to claim 1, characterized in that, The pipe adapter assembly includes a rotary joint (12) and a tee joint (13). The rotating end of the rotary joint (12) extends into the housing (4) and is sealed and fixedly connected to the top of the rotary pipe (6). The fixed end of the rotary joint (12) is sealed and fixedly connected through one end of the pipe tee joint (13). The other two ends of the tee joint (13) are sealed and fixedly connected to the air-filling end and the liquid-filling end of the water-air dual-purpose pump (5) through pipes, respectively. The other two ends of the tee joint (13) are respectively equipped with an air-filling solenoid valve and a liquid-filling solenoid valve.

4. The aeration tank for wastewater treatment according to claim 1, characterized in that, A medicine storage tank (14) is fixedly installed on the top outer wall of the sliding seat (3), and the liquid extraction end of the water-air dual-purpose pump (5) is fixedly connected to the medicine storage tank (14) through a pipe. The top of the medicine storage tank (14) is provided with a filling pipe, and a sealing cap is threaded onto the filling pipe.

5. An aeration tank for wastewater treatment according to claim 1, characterized in that, The surface of the aeration head (7) is provided with evenly distributed air holes (15), a one-way valve is installed at the lower part of the rotating tube (6), and the brush roller (17) is in contact with the inner wall of the aeration head (7).

6. An aeration tank for wastewater treatment according to claim 1, characterized in that, The horizontal reciprocating moving mechanism includes a rack (20) fixedly connected to the top outer wall of the guide rail (2), a first stepper motor (21) fixedly installed on the front outer wall of the sliding seat (3), and a transmission gear (22) fixedly mounted on the output shaft of the first stepper motor (21). The output shaft of the first stepper motor (21) passes through the front of the sliding seat (3), and the transmission gear (22) meshes with the rack (20).

7. An aeration tank for wastewater treatment according to claim 1, characterized in that, The depth adjustment mechanism includes two symmetrically distributed threaded lifting components, and each threaded lifting component includes a hollow shell (23) welded to the side wall of the pool body (1), a lead screw (24) rotatably installed in the hollow shell (23), a lifting rod (25) threadedly connected to the lead screw (24), a fixed cover (26) fixedly connected to the side wall of the hollow shell (23), a second stepper motor (27) fixedly installed on the top outer wall of the fixed cover (26), an active synchronous wheel (28) fixedly mounted on the output shaft of the second stepper motor (27), and a driven synchronous wheel (29) fixedly mounted on the lower part of the lead screw (24).

8. An aeration tank for wastewater treatment according to claim 7, characterized in that, The output shaft of the second stepper motor (27) passes through the top of the fixed cover (26), and the driving synchronous pulley (28) and the driven synchronous pulley (29) are connected by the same synchronous belt (30).

9. An aeration tank for wastewater treatment according to claim 7, characterized in that, The top of the hollow shell (23) is provided with a lifting slide, the outer wall of the lifting rod (25) is slidably connected to the inner wall of the lifting slide, and the top outer wall of the lifting rod (25) is welded to the bottom outer wall of the guide rail (2).

10. An aeration tank for wastewater treatment according to claim 1, characterized in that, The upper outer wall of the pool body (1) is fixed with a main controller (31) by a support plate, and the lower part of the pool body (1) is fixedly connected to a discharge pipe (32), and a discharge solenoid valve is installed on the discharge pipe (32).

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