Settling type continuous discharging centrifugal dehydrator for kitchen waste

Abstract

A kitchen waste sedimentation type continuous discharging centrifugal dehydrator comprises a shell, a discharging screw, a rotary drum and a driving mechanism, the rotary drum is installed in the shell, the discharging screw is vertically installed in the rotary drum, and the driving mechanism drives the rotary drum and the discharging screw to rotate at a differential speed; a separation area is formed between the discharging screw and the rotary drum, a liquid outlet area is formed between the rotary drum and the shell, and a clear liquid opening is formed in the shell; a first water retaining ring is fixedly installed on the outer side of the discharging spiral and located in the area above the overflow opening, a second water retaining ring is fixedly installed on the outer side of the rotary drum and located on the lower portion of the rotary drum, and the second water retaining ring is used for retaining clear liquid and guiding the clear liquid to flow to the clear liquid opening. The rotary drum and the discharging screw are controlled to rotate at the differential speed through the driving mechanism, the structure is simple, the cost is low, the first water retaining ring and the second water retaining ring are arranged to conduct water retaining treatment on the upper end and the lower end respectively, clear liquid is prevented from entering the upper end, the lower end and the bearing, and the rotary drum type garbage dewatering device belongs to the technical field of garbage disposal dewatering.

Description

Technical Field

[0001] The utility model relates to the technical field of garbage treatment and dehydration, in particular to a sedimentation-type continuous unloading centrifugal dehydrator for kitchen garbage. Background Art

[0002] Catering waste includes perishable waste such as catering waste, kitchen waste, organic waste from farmers' markets, and organic waste from food processing plants. Catering waste includes food processing waste, discarded food, leftovers, and kitchen scraps generated by households and catering operations. Residential areas, restaurants, and canteens of various enterprises and institutions are the places where it is concentrated.

[0003] Kitchen waste accounts for more than 60% of the total amount of urban waste. Due to its particularity, during the storage, collection, transportation and landfill process, kitchen waste is very easy to rot and stink in a short period of time due to its high moisture content and organic matter content, and it breeds mosquitoes and flies, which greatly pollutes the surrounding environment. In addition, the disposal methods of urban waste are usually incineration and landfill. Landfilling, incineration power generation, and direct composting of kitchen waste all have great disadvantages. These characteristics of kitchen waste show that on the one hand, it has a high utilization value, and on the other hand, it must be properly treated to achieve the unity of social benefits, economic benefits and environmental benefits. In order to effectively reuse kitchen waste, it has become a consensus to treat kitchen waste separately at the source.

[0004] The dehydration equipment for food waste is the key equipment for its source treatment. The current dehydration methods include: screw extrusion dehydration, plate and frame extrusion filtration dehydration, roller filtration dehydration, filter screen drainage, screw unloading centrifugal dehydration (vertical and horizontal forms), etc. These dehydration equipments have their own advantages and disadvantages.

[0005] Among them, the existing vertical spiral unloading sedimentation centrifuge is mainly composed of a drum, a unloading spiral, a feed pipe, a bracket and a transmission device. It is a precise and expensive large-scale mechanical equipment, generally used for the centrifugal separation of high value-added products. Its spiral and drum axis are arranged vertically, generally with one end bearing support and one end suspended, which requires very high rotation accuracy and material uniformity of each rotating part of the centrifuge. When the centrifuge is performing dehydration, clarification, separation and other operations, the material enters the inside of the unloading spiral from the feed pipe, and then enters the drum from the feeding hole of the unloading spiral for centrifugal separation. For materials with uniform composition, the separation factor is high, the separation effect is good, the feeding is convenient, and the structure is compact. Centrifugal sedimentation dehydration has high energy consumption rate, high dehydration efficiency, compact structure, and is not easy to clog without a filter, but the current centrifugal dehydration equipment has some defects in the application of food waste dehydration. On the one hand, the existing vertical centrifuges generally use dual motors, one motor drives the drum and the other drives the discharge screw, and a control system is used to control the speed of the two motors to achieve a speed difference; or one motor uses a differential to achieve a speed difference between the drum and the discharge screw; the control structure is complex and the cost is high; on the other hand, in order to achieve high speed and high separation factor, the existing vertical centrifuge adopts a cantilever structure, which has high requirements on the uniformity of the material and is not suitable for materials with complex components such as food waste. Utility Model Content

[0006] In view of the technical problems existing in the prior art, the purpose of the utility model is to provide a kitchen waste sedimentation type continuous unloading centrifugal dehydrator which can prevent clear liquid from leaking into the machine, has two end supports, a single motor, low cost and strong adaptability.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a kind of food waste sedimentation type continuous unloading centrifugal dehydrator, comprising a shell, a unloading screw, a drum and a driving mechanism, the drum is installed inside the shell, the unloading screw is vertically installed inside the drum, and the driving mechanism drives the drum and the unloading screw to rotate at differential speeds; a separation zone is formed between the unloading screw and the drum, and a liquid outlet zone is formed between the drum and the shell, a feed port is opened at the upper end of the shell, a feed channel is arranged inside the unloading screw, and a material distribution hole is arranged outside the unloading screw, the feed port is connected to the separation zone through the feed channel and the material distribution hole in sequence, an overflow port is arranged above the separation zone, a clear liquid port is opened in the shell, and the overflow port is connected to the clear liquid port through the liquid outlet zone; a first water retaining ring is fixedly installed on the outer side of the unloading screw, and the first water retaining ring is located in the upper area of ​​the overflow port, and a second water retaining ring is fixedly installed on the outer side of the drum, and the second water retaining ring is located at the lower part of the drum, and the second water retaining ring is used to block the clear liquid and guide the clear liquid to flow to the clear liquid port. The unloading screw and the drum are supported at both ends to enhance the adaptability to uneven materials.

[0008] After adopting this structure, the drum and the discharge screw are controlled by a driving mechanism to rotate differentially to achieve separation. The structure is simple and the cost is low. A first water retaining ring and a second water retaining ring are provided to retain water at the upper and lower ends respectively to prevent clear liquid from entering the upper and lower ends and the bearings.

[0009] As a preferred embodiment, the third water retaining ring is also included. The third water retaining ring is cylindrical and located in the lower area of ​​the second water retaining ring. The lower edge of the third water retaining ring is fixedly connected to the shell, and the upper edge height of the third water retaining ring is higher than the center height of the clear liquid outlet. The second water retaining ring is umbrella-shaped and surrounds the outer periphery of the drum. The lower edge height of the second water retaining ring is lower than the upper end height of the clear liquid outlet. The outer diameter of the third water retaining ring is smaller than the outer diameter of the second water retaining ring. After adopting this structure, the umbrella-shaped second water retaining ring can guide the clear liquid to flow to the clear liquid outlet without penetrating inward, and the third water retaining ring can further prevent the clear liquid from entering the inner side of the shell.

[0010] As a preferred embodiment, the first water retaining ring includes a water retaining plate and a plurality of blades, the water retaining plate is annular, and the plurality of blades are installed at the lower end of the water retaining plate. With this structure, when the first water retaining ring rotates with the unloading spiral, the plurality of blades push the clear liquid outward, and the clear liquid is sent out through the overflow port, which can effectively prevent the clear liquid from penetrating upward.

[0011] As a preferred embodiment, an overflow ring is fixedly connected to the upper end of the drum, the overflow port is opened on the side of the overflow ring, the lower end of the overflow ring is bent inward, and the first water retaining ring is fixedly connected to the upper end of the overflow ring. After adopting this structure, the overflow ring is designed to be separated from the drum, the overflow ring is detachable, and the corresponding specifications can be installed as needed. The height of the overflow ring controls the liquid flow rate, and then determines the water content of the solids. The liquid is discharged from the drum through the overflow hole at the upper end of the drum.

[0012] As a preferred embodiment, the discharge screw passes through the lower end of the drum, a discharge channel is formed between the lower end of the drum and the discharge screw, a discharge port is provided at the lower end of the shell, and the lower end of the separation zone is connected to the discharge port through the discharge channel. With this structure, the solid material passes through the discharge channel at the lower end and is sent out from the discharge port.

[0013] As a preferred embodiment, it further comprises a square frame, the shell is fixedly mounted on the square frame, and the lower end of the shell extends into the square frame. After adopting this structure, solid materials are sent out from the discharge port, the materials are not easy to splash, and the collection of materials is convenient.

[0014] As a preferred embodiment, the driving mechanism includes a driving motor, which is connected to the unloading screw and the drum through toothed synchronous pulleys, and drives the unloading screw and the drum to rotate differentially. After adopting this structure, compared with the existing differential or dual-drive structure, the above-mentioned differential transmission is realized through toothed synchronous pulleys, which has a simple structure and low cost.

[0015] As a preferred embodiment, the unloading screw includes a central axis and spiral blades located on the periphery of the central axis, the feed channel is opened inside the central axis, the upper end of the unloading screw faces the feed port, the lower end of the feed port is fixedly connected with a feed pipe, and the feed pipe extends into the feed channel. After adopting this structure, the material enters the feed channel from the upper feed port through the feed pipe, which is convenient for feeding.

[0016] As a preferred embodiment, the central shaft is composed of an upper shaft section and a lower shaft section, the material distribution hole is located between the lower end of the upper shaft section and the upper end of the lower shaft section, and a conical material distribution hopper is provided at the upper end of the lower shaft section. With this structure, the number of material distribution holes can be one or more, the tip of the material distribution hopper faces upward, and when the material distribution hopper rotates with the entire central shaft, it can accelerate the material, the material is not easily blocked, and rapid material distribution is achieved.

[0017] As a preferred embodiment, the upper and lower parts of the drum are rotatably connected to the housing through a first upper bearing and a first lower bearing respectively, the upper part of the discharge screw is rotatably connected to the drum through a second upper bearing, and the lower part of the discharge screw is rotatably connected to the housing through a second lower bearing;

[0018] The first upper bearing and the second upper bearing are both located in the upper area of ​​the first water retaining ring, and the first lower bearing and the second lower bearing are both located in the lower area of ​​the third water retaining ring. With this structure, under the action of the three water retaining rings, clear liquid will not enter the bearing part, and the bearing can be protected from the influence of the liquid.

[0019] The working principle of the utility model is as follows: the material to be separated passes through the feed pipe from the feed channel inside the discharge screw, and then enters the separation area in the drum through the distribution hole. After being accelerated by the discharge screw, a liquid ring is formed under the action of centrifugal force. From the axis of rotation to the outside, the density of the material gradually increases, and the solid phase with higher density settles to the inner surface of the drum. The drum and the discharge screw are vertical to the ground, installed concentrically, supported by bearings, and driven separately by toothed synchronous pulleys. The speed difference between the discharge screw and the drum is achieved by matching the different tooth differences of the synchronous pulleys. The speed difference between the drum and the discharge screw enables the discharge screw to continuously and gradually push out the solids, which are compressed and dehydrated in the cone section at the bottom of the drum and discharged from the discharge port at the lower end of the drum.

[0020] In general, the utility model has the following advantages:

[0021] (1) The centrifugal dehydrator of the utility model adopts a toothed synchronous belt drive, which makes the transmission simple and convenient, and realizes the differential rotation of the drum and the discharge screw with a simple and easy structure.

[0022] (2) The utility model is designed with an independent and detachable overflow ring, and overflow rings of different specifications can be installed according to different processing objects to meet the needs of materials with different properties and different dehydration rates.

[0023] (3) The utility model adopts a vertical arrangement, with the drum and the discharge screw supported at both ends, thereby reducing the eccentric vibration caused by uneven material distribution.

[0024] (4) The utility model is designed with a discharge port for direct discharge of materials, which reduces the probability of the discharge port being blocked.

[0025] (5) The utility model designs three simple and practical water retaining rings, and replaces the parts that originally require dynamic sealing with water retaining rings, thereby reducing the sealing cost and maintaining reliable sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional structural diagram of the utility model.

[0027] Figure 2 It is a schematic diagram of the internal structure of the utility model.

[0028] Figure 3 This is a three-dimensional diagram of the connection between the overflow ring and the first water retaining ring.

[0029] Figure 4 It is a three-dimensional diagram of the first water retaining ring.

[0030] Figure 5 It is a three-dimensional diagram of the rotating drum.

[0031] Figure 6 This is a three-dimensional diagram of the unloading screw.

[0032] Figure 7 It is a three-dimensional diagram of the second water retaining ring.

[0033] Figure 8 This is a diagram of the internal material distribution of the utility model when it is working.

[0034] Among them, 1 is the shell, 2 is the drum, 3 is the unloading screw, 4 is the driving mechanism, 5 is the square frame, 6 is the first water retaining ring, 7 is the second water retaining ring, 8 is the third water retaining ring, 9 is the first upper bearing, 10 is the first lower bearing, 11 is the second upper bearing, 12 is the second lower bearing, 13 is the overflow port, 14 is the discharge port, 15 is the clear liquid port, 16 is the overflow ring, 17 is the material distribution hole, 18 is the feed port, 19 is the distribution hopper, 20 is the first driving pulley, 21 is the first driven pulley, 22 is the second driving pulley, and 23 is the second driven pulley. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] Embodiment 1

[0037] like Figures 1 to 7As shown, a food waste sedimentation type continuous discharge centrifugal dehydrator comprises a shell 1, a discharge screw 3, a drum 2 and a driving mechanism 4, wherein the drum 2 is installed inside the shell 1, the discharge screw 3 is vertically installed inside the drum 2, and the driving mechanism 4 drives the drum 2 and the discharge screw 3 to rotate at a differential speed; a separation zone is formed between the discharge screw 3 and the drum 2, and a liquid outlet zone is formed between the drum 2 and the shell 1, a feed port 18 is opened at the upper end of the shell 1, a feed channel is provided inside the discharge screw 3, and a cloth is provided on the outer side of the discharge screw 3. The material hole 17 and the feed port 18 are connected to the separation zone via the feed channel and the material distribution hole 17 in sequence. An overflow port 13 is provided above the separation zone. The outer shell 1 is provided with a clear liquid port 15. The overflow port 13 is connected to the clear liquid port 15 via the liquid outlet area. A first water retaining ring 6 is fixedly installed on the outer side of the unloading spiral 3. The first water retaining ring 6 is located in the upper area of ​​the overflow port 13. A second water retaining ring 7 is fixedly installed on the outer side of the drum 2. The second water retaining ring 7 is located at the lower part of the drum 2. The second water retaining ring 7 is used to block the clear liquid and guide the clear liquid to flow to the clear liquid port 15.

[0038] It also includes a third water retaining ring 8, which is cylindrical and located in the lower area of ​​the second water retaining ring 7, the lower edge of the third water retaining ring 8 is fixedly connected to the shell 1, and the upper edge height of the third water retaining ring 8 is higher than the center height of the clear liquid port 15; the second water retaining ring 7 is umbrella-shaped and surrounds the outer periphery of the drum 2, the lower edge height of the second water retaining ring 7 is lower than the upper end height of the clear liquid port 15, and the outer diameter of the third water retaining ring 8 is smaller than the outer diameter of the second water retaining ring 7. After adopting this structure, the umbrella-shaped second water retaining ring 7 can guide the clear liquid to flow to the clear liquid port 15 without infiltration, and the third water retaining ring 8 can further prevent the clear liquid from entering the inner side of the shell 1.

[0039] The centrifuge is provided with three water retaining rings, which are fixed on the discharge screw 3, the drum 2 and the outer shell 1 respectively. When the centrifuge is working, the liquid will not enter the bearing part under the action of centrifugal force; when the centrifuge is not working, the liquid can be guided into the outlet part to protect the bearing from the influence of the liquid.

[0040] The first water retaining ring 6 comprises a water retaining plate and a plurality of blades. The water retaining plate is annular and the plurality of blades are mounted on the lower end of the water retaining plate.

[0041] An overflow ring 16 is fixedly connected to the upper end of the drum 2 . The overflow port 13 is opened on the side of the overflow ring 16 . The lower end of the overflow ring 16 is bent inward. The first water retaining ring 6 is fixedly connected to the upper end of the overflow ring 16 .

[0042] The discharge screw 3 passes through the lower end of the drum 2, and a discharge channel is formed between the lower end of the drum 2 and the discharge screw 3. A discharge port 14 is provided at the lower end of the shell 1, and the lower end of the separation zone is connected to the discharge port 14 through the discharge channel.

[0043] The drum 2 comprises a cylindrical section at the upper part and a conical section at the lower part, and the conical section is in a cone shape that contracts downward.

[0044] It also includes a square frame 5 , on which the outer shell 1 is fixedly mounted, and the lower end of the outer shell 1 extends into the square frame 5 .

[0045] The driving mechanism 4 includes a driving motor, which is connected to the unloading screw 3 and the rotating drum 2 through toothed synchronous pulleys, and drives the unloading screw 3 and the rotating drum 2 to rotate at a differential speed.

[0046] The toothed synchronous pulley includes a first driving pulley 20, a first driven pulley 21, a second driving pulley 22 and a second driven pulley 23. The output end of the driving motor is connected to a driving shaft. The first driving pulley 20 and the second driving pulley 22 are respectively sleeved on the driving shaft. The first driving pulley 20 and the first driven pulley 21 are driven by a toothed belt, and the second driving pulley 22 and the second driven pulley 23 are driven by a toothed belt. The first driven pulley 21 is sleeved on the outer side of the drum 2 and drives the drum 2 to rotate synchronously. The second driven pulley 23 is sleeved on the outer side of the unloading screw and drives the unloading screw 3 to rotate synchronously.

[0047] The speed difference between the unloading screw 3 and the drum 2 can be adjusted by the transmission ratio between the first driving pulley 20 and the first driven pulley 21, and the transmission ratio between the second driving pulley 22 and the second driven pulley 23. In this embodiment, the speed of the unloading screw 3 is 5% lower than that of the drum 2.

[0048] The unloading screw 3 includes a central axis and spiral blades located on the periphery of the central axis. The feed channel is opened inside the central axis. The upper end of the unloading screw 3 faces the feed port 18. The lower end of the feed port 18 is fixedly connected with a feed pipe, which extends into the feed channel.

[0049] The middle shaft is composed of an upper shaft section and a lower shaft section, and a feeding hole 17 is located between the lower end of the upper shaft section and the upper end of the lower shaft section, and a conical material distribution hopper 19 is provided at the upper end of the lower shaft section. The feeding hole 17 is located in the middle of the middle shaft, and the material (kitchen waste) is transported downward from the feeding channel and sent out from the feeding hole 17 to the separation area.

[0050] The upper and lower parts of the drum 2 are rotatably connected to the housing 1 through the first upper bearing 9 and the first lower bearing 10 respectively, the upper part of the discharge screw 3 is rotatably connected to the drum 2 through the second upper bearing 11, and the lower part of the discharge screw 3 is rotatably connected to the housing 1 through the second lower bearing 12;

[0051] The first upper bearing 9 and the second upper bearing 11 are both located in the upper region of the first water retaining ring 6 , and the first lower bearing 10 and the second lower bearing 12 are both located in the lower region of the third water retaining ring 8 .

[0052] The working process of the above centrifuge is as follows: when dehydrating food waste, the food waste is first crushed, and the water-slag mixture is transported to the centrifuge by the sewage pump and input from the feed port 18. The driving motor drives the screw of the discharge screw 3 and the drum 2 to rotate through the toothed belt, and the speed of the discharge screw 3 is 5% lower than that of the drum 2. The slag-water mixture flows in through the feed channel inside the discharge screw 3, is accelerated by the distribution hopper 19, and enters the separation area inside the drum 2 from the distribution hole 17. In the drum 2, the slag-water mixture has concentric columnar layers due to different specific gravities and different centrifugal forces. Figure 8 The material distribution diagram at this time is shown, in which larger particles represent solid phases with larger specific gravity, and smaller particles represent liquid phases with smaller specific gravity. The solid phases with larger specific gravity are in the outer layer, and the liquid phases with smaller specific gravity are in the middle. The lighter liquid phase goes up over the overflow ring 16 and is discharged from the drain port. The height of the overflow ring 16 controls the liquid phase flow rate, which in turn affects the dehydration rate of the solid phase. The solid phase is pushed downward by the unloading screw 3, and is further squeezed and dehydrated in the cone section at the bottom of the drum 2, and finally discharged from the discharge port 14.

[0053] The above embodiments are preferred implementation modes of the utility model, but the implementation modes of the utility model are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the utility model should be equivalent replacement methods and are included in the protection scope of the utility model.

Claims

1. A kitchen waste sedimentation type continuous unloading centrifugal dehydrator, characterized in that: It includes a shell, a discharge screw, a drum and a driving mechanism, wherein the drum is installed inside the shell, the discharge screw is vertically installed inside the drum, and the driving mechanism drives the drum and the discharge screw to rotate at a differential speed; A separation zone is formed between the discharge screw and the drum, and a liquid outlet zone is formed between the drum and the shell. A feed port is provided at the upper end of the shell, a feed channel is provided inside the discharge screw, and a distribution hole is provided outside the discharge screw. The feed port is connected to the separation zone through the feed channel and the distribution hole in sequence. An overflow port is provided above the separation zone, and a clear liquid port is provided in the shell. The overflow port is connected to the clear liquid port through the liquid outlet zone. A first water retaining ring is fixedly installed on the outside of the unloading screw, and the first water retaining ring is located in the upper area of ​​the overflow port. A second water retaining ring is fixedly installed on the outside of the drum, and the second water retaining ring is located at the lower part of the drum. The second water retaining ring is used to block the clear liquid and guide the clear liquid to flow to the clear liquid port.

2. A kitchen waste sedimentation type continuous unloading centrifugal dehydrator according to claim 1, characterized in that: It also includes a third water retaining ring, which is cylindrical and located in the lower area of ​​the second water retaining ring, the lower edge of the third water retaining ring is fixedly connected to the shell, and the upper edge height of the third water retaining ring is higher than the center height of the clear liquid outlet; The second water retaining ring is umbrella-shaped and surrounds the outer circumference of the drum. The lower edge height of the second water retaining ring is lower than the upper end height of the clear liquid outlet. The outer diameter of the third water retaining ring is smaller than the outer diameter of the second water retaining ring.

3. A kitchen waste sedimentation type continuous unloading centrifugal dehydrator according to claim 1, characterized in that: The first water retaining ring comprises a water retaining plate and a plurality of blades. The water retaining plate is annular and the plurality of blades are mounted on the lower end of the water retaining plate.

4. A kitchen waste sedimentation type continuous unloading centrifugal dehydrator according to claim 1, characterized in that: The upper end of the drum is fixedly connected with an overflow ring, the overflow port is opened on the side of the overflow ring, the lower end of the overflow ring is bent inward, and the first water retaining ring is fixedly connected with the upper end of the overflow ring.

5. A kitchen waste sedimentation type continuous unloading centrifugal dehydrator according to claim 1, characterized in that: The discharge screw passes through the lower end of the drum, and a discharge channel is formed between the lower end of the drum and the discharge screw. The lower end of the shell is provided with a discharge port, and the lower end of the separation zone is connected to the discharge port through the discharge channel.

6. A kitchen waste sedimentation type continuous unloading centrifugal dehydrator according to claim 5, characterized in that: The utility model also comprises a square frame, on which the outer shell is fixedly installed, and the lower end of the outer shell extends into the square frame.

7. A kitchen waste sedimentation type continuous unloading centrifugal dehydrator according to claim 1, characterized in that: The driving mechanism comprises a driving motor, which is respectively connected to the unloading screw and the rotating drum through toothed synchronous pulleys, and drives the unloading screw and the rotating drum to rotate at a differential speed.

8. A kitchen waste sedimentation type continuous unloading centrifugal dehydrator according to claim 1, characterized in that: The unloading screw includes a central axis and spiral blades located on the periphery of the central axis. The feed channel is opened inside the central axis. The upper end of the unloading screw faces the feed port. The lower end of the feed port is fixedly connected with a feed pipe, which extends into the feed channel.

9. A kitchen waste sedimentation type continuous unloading centrifugal dehydrator according to claim 8, characterized in that: The middle shaft consists of an upper shaft section and a lower shaft section. The material distribution hole is located between the lower end of the upper shaft section and the upper end of the lower shaft section. A conical material distribution hopper is arranged at the upper end of the lower shaft section.

10. A kitchen waste sedimentation type continuous unloading centrifugal dehydrator according to claim 2, characterized in that: The upper part and the lower part of the drum are rotatably connected to the housing through the first upper bearing and the first lower bearing respectively, the upper part of the discharge screw is rotatably connected to the drum through the second upper bearing, and the lower part of the discharge screw is rotatably connected to the housing through the second lower bearing; The first upper bearing and the second upper bearing are both located in the upper region of the first water retaining ring, and the first lower bearing and the second lower bearing are both located in the lower region of the third water retaining ring.

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