Natural gas purification production wastewater treatment device

Abstract

The utility model relates to the technical field of natural gas wastewater treatment, in particular to a natural gas purification production wastewater treatment device which comprises a filter cartridge, a filter cover and a cleaning assembly, the filter cover is arranged in the filter cartridge, and the two ends of the filter cover are rotationally connected with the two end faces of the filter cartridge respectively; the cleaning assembly is arranged in the filter cover and can move along the central axis of the filter cover, and the circumferential surface of the cleaning assembly is in contact with the inner side surface of the filter cover; according to the utility model, the cleaning assembly is arranged, and the cleaning assembly moves back and forth in the filter cover, so that a filtered object in the filter cover is shifted to the other side of the moving ring, and the filtered object in the filter cover is cleaned under the condition of not influencing the wastewater filtration of the filter cover, thereby ensuring that the wastewater can be continuously filtered.

Description

Technical Field

[0001] The invention relates to the technical field of natural gas wastewater treatment, and in particular to a natural gas purification production wastewater treatment device. Background Art

[0002] A large amount of wastewater is generated during the natural gas purification process. The commonly used wastewater treatment principle is flotation-hydrolysis acidification-anaerobic reaction-aerobic reaction-membrane filtration. When each process is completed and flows into the next process, in order to speed up the wastewater treatment efficiency, the treated wastewater needs to be filtered.

[0003] Therefore, a natural gas purification production wastewater treatment device divides the interior of the limit frame into a first water storage tank, a second water storage tank, a third water storage tank and a fourth water storage tank. After the wastewater is injected into the first water storage tank through the water injection port on the water injection seat, when the wastewater reaches a fixed capacity, it overflows into the second water storage tank through the filter net assembly, and similarly overflows into the third water storage tank and the fourth water storage tank. Then, through the filtering effect of the filter net assembly, the impurity content in the wastewater in the first water storage tank, the second water storage tank, the third water storage tank and the fourth water storage tank is different, which plays a role in classifying the wastewater, and then facilitates the classification and treatment of the wastewater, thereby improving the treatment efficiency of the wastewater;

[0004] However, after a long period of filtering, too much debris filtered on the surface of the filter component will affect the permeability, thus affecting the filtering effect of the wastewater. Therefore, it is necessary to observe and clear the filter component from time to time, so the continuous filtration treatment of the wastewater cannot be guaranteed. Summary of the invention

[0005] The technical problem to be solved by the present invention is that after a long period of filtering, too much debris filtered on the surface of the filter assembly will affect the permeability. The purpose is to provide a natural gas purification production wastewater treatment device, which can realize the cleaning of the filtered material in the filter cover without affecting the filtering of the wastewater by the filter cover.

[0006] The present invention is achieved through the following technical solutions:

[0007] A natural gas purification production wastewater treatment device, comprising:

[0008] A filter cartridge having a closed first end surface and a closed second end surface;

[0009] A filter cover is arranged inside the filter cartridge, and two ends of the filter cover are rotatably connected to two end surfaces of the filter cartridge respectively;

[0010] A cleaning assembly is disposed inside the filter housing and is movable along the central axis of the filter housing, wherein a circumferential surface of the cleaning assembly contacts an inner side surface of the filter housing;

[0011] The water inlet of the filter cartridge is arranged on the first end surface of the filter cartridge and communicates with the interior of the filter cover, and the water outlet of the filter cartridge is arranged on the second end surface of the filter cartridge and communicates with the cavity between the inner side surface of the filter cartridge and the outer side surface of the filter cover;

[0012] An extrusion tube communicating with the interior of the filter housing is disposed on the second end surface of the filter cartridge.

[0013] Specifically, the cleaning component includes:

[0014] A plurality of screw rods, each of which is arranged parallel to the central axis of the filter cover, and both ends of the plurality of screw rods are respectively connected to two end surfaces of the filter cartridge;

[0015] A moving ring is coaxially arranged in the filter housing, and a plurality of through holes corresponding to the screw rod are arranged on the moving ring, and the moving ring slides relative to the filter housing through the through holes and the screw rod;

[0016] A rotating ring is coaxially arranged with the movable ring, and the inner ring surface of the rotating ring is rotatably connected with the outer ring surface of the movable ring, and the outer ring surface of the rotating ring contacts the inner side surface of the filter cover.

[0017] Optionally, the plurality of screw rods are distributed in a circular array, one of the plurality of through holes is provided with an internal thread engaged with the screw rod, and the screw rod connected to the through hole provided with the internal thread extends outward and is connected to a driving shaft of a motor provided on the second end face of the filter cartridge.

[0018] Optionally, a turbine blade is disposed on the first side of the rotating ring, and a brush is fixedly connected to the second side of the rotating ring, and the bristles of the brush are in contact with the inner side of the filter cover.

[0019] Optionally, a cylindrical protrusion adapted to the central through hole of the movable ring is disposed on the inner side of the second end surface of the filter cartridge, a cylindrical section without filter holes is disposed at the second end of the filter cover, and the extrusion tube communicates with the cavity between the cylindrical protrusion and the filter cover;

[0020] The movable ring is provided with a switch valve and an elastic one-way valve communicating with two side surfaces thereof.

[0021] Optionally, filter cotton is arranged in the valve body of the switch valve, and the connection direction of the elastic one-way valve is from the first side surface of the movable ring to the second side surface thereof.

[0022] Specifically, a drainage pipe communicating with the water outlet is disposed on the outer side of the second end surface of the filter cartridge, a water turbine is disposed inside the drainage pipe, and the shaft end of the water turbine extends into the filter cartridge and is fixedly connected to the gear ring assembly;

[0023] The filter cover is rotatably connected to the filter cartridge via an annular sliding assembly. The outer ring surface of the filter cover is provided with an outer wall toothed ring, which is meshed with the toothed ring assembly. The water turbine drives the filter cover to rotate.

[0024] Optionally, a stirring assembly is provided between the filter cartridge and the filter cover, the stirring assembly is rotationally connected to the filter cartridge via an annular sliding assembly, an inner wall gear ring is connected to the stirring assembly, the inner wall gear ring is meshed with the gear ring group, and the water turbine drives the stirring assembly to rotate.

[0025] Optionally, the stirring assembly includes: a plurality of levers and lever rings distributed in a ring array, two lever rings are respectively arranged at the two ends of the filter cylinder, and the two ends of the lever are respectively fixedly connected to the two lever rings, and the inner wall toothed ring is arranged on the lever ring.

[0026] Optionally, the annular sliding assembly includes: an annular sliding groove and an annular sliding edge, the annular sliding edge is arranged on the end surface or the inner side surface of the filter cylinder, and the annular sliding groove is arranged on the end surface of the filter cover or the stirring assembly.

[0027] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0028] The utility model provides a cleaning component, which is used to move back and forth in the filter cover to move the filtered material in the filter cover to the other side of the moving ring, thereby cleaning the filtered material in the filter cover without affecting the filtering of wastewater by the filter cover, thereby ensuring that the wastewater can be filtered continuously.

[0029] The utility model arranges a water turbine in the drain pipe. When draining water, the water turbine is forced to rotate and drive the gear ring group to rotate, so that the inner wall gear ring drives the lever to rotate, so that the filtered wastewater falling into the filter cartridge is secondary stirred, and the retention time of the wastewater in the filter cartridge is increased. Therefore, the reaction time of the wastewater and the flocculant can be increased, ensuring sufficient reaction and flocculation, and further ensuring the wastewater treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, are used to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention, and the accompanying drawings are included in and constitute a part of this specification and do not constitute a limitation of the embodiments of the present invention.

[0031] Figure 1 It is a schematic diagram of the external structure of a natural gas purification production wastewater treatment device according to the present invention.

[0032] Figure 2 It is an axial cross-sectional view of a natural gas purification production wastewater treatment device according to the present invention.

[0033] Figure 3 It is a cross-sectional view of a natural gas purification production wastewater treatment device according to the present invention.

[0034] Figure 4 It is an axial cross-sectional view of a natural gas purification production wastewater treatment device according to the present invention.

[0035] Figure 5 It is a partially enlarged schematic diagram of a natural gas purification production wastewater treatment device according to the present invention.

[0036] Figure numerals: 1-filter cartridge; 2-extrusion tube; 3-drain pipe; 4-filter cover; 5-screw rod; 6-push rod; 7-inner wall gear ring; 8-moving ring; 9-outer wall gear ring; 10-water turbine; 11-gear ring group; 12-swivel ring; 13-elastic one-way valve; 14-switch valve; 15-brush; 16-turbine blade. DETAILED DESCRIPTION

[0037] To make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and implementation methods. It is understood that the specific implementation methods described herein are only used to explain the relevant content, rather than to limit the present invention.

[0038] It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the drawings.

[0039] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] In the absence of conflict, the embodiments and features of the embodiments of the present invention may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] Embodiment 1

[0043] like Figure 1 and Figure 2 As shown, a natural gas purification production wastewater treatment device includes: a filter cartridge 1, a filter cover 4 and a cleaning component.

[0044] The filter cartridge 1 has a closed first end face and a second end face (hereinafter, the first end and the second end are used to replace the direction of the entire wastewater treatment device); the filter cover 4 is arranged inside the filter cartridge 1, and the two ends of the filter cover 4 are rotatably connected to the two end faces of the filter cartridge 1 respectively;

[0045] The cleaning component is arranged inside the filter cover 4 and can move along the central axis of the filter cover 4, and the circumferential surface of the cleaning component contacts the inner side surface of the filter cover 4;

[0046] The water inlet of the filter cartridge 1 is arranged on the first end face of the filter cartridge 1 and is connected to the interior of the filter cover 4. The water outlet of the filter cartridge 1 is arranged on the second end face of the filter cartridge 1 and is connected to the cavity between the inner side face of the filter cartridge 1 and the outer side face of the filter cover 4. An extrusion tube 2 connected to the interior of the filter cover 4 is arranged on the second end face of the filter cartridge 1.

[0047] The unfiltered water is passed into the filter cover 4, and the impurities are retained inside the filter cover 4 through the filter holes on the filter cover 4. The filtered water flows between the filter cover 4 and the filter cartridge 1, and then is discharged from the water outlet, thereby achieving separation of the internal filtered materials.

[0048] Therefore, impurities will adhere to the inner side of the filter cover 4. By sliding the cleaning component axially inside the filter cover 4, the impurities on the inner side of the filter cover 4 can be scraped off and discharged from the extrusion tube 2, thereby cleaning the inside of the filter cover 4.

[0049] like Figure 2 , Figure 3and Figure 4 As shown, the cleaning assembly includes: a lead screw, a moving ring 8 and a rotating ring 12.

[0050] Multiple screw rods 5 are arranged parallel to the central axis of the filter cover 4, and the two ends of the multiple screw rods 5 are respectively connected to the two end faces of the filter cylinder 1; the movable ring 8 is coaxially arranged in the filter cover 4, and the movable ring 8 is provided with multiple through holes corresponding to the screw rods 5, and the movable ring 8 slides relative to the filter cover 4 through the through holes and the screw rods 5; the swivel ring 12 is coaxially arranged with the movable ring 8, and the inner ring surface of the swivel ring 12 is rotatably connected to the outer ring surface of the movable ring 8, and the outer ring surface of the swivel ring 12 contacts the inner side surface of the filter cover 4.

[0051] Multiple screw rods 5 are distributed in a circular array, one of the multiple through holes is provided with an internal thread engaged with the screw rod 5, and the screw rod 5 connected to the through hole provided with the internal thread extends outward and is connected to the driving shaft of the motor arranged on the second end surface of the filter cartridge 1.

[0052] The cleaning component can be a filter cover 4 that works simultaneously. When the filter cover 4 is filtering, one of the screw rods 5 rotates to realize that the movable ring 8 is separated from the second end of the filter cartridge 1, and slides in the filter cover 4 toward the water inlet direction of the filter cartridge 1 (i.e., the first end). During the sliding process, the rotating ring 12 on the outer side slides along the inner wall of the filter cover 4 to clean the inner wall of the filter cover 4, thereby playing a role in clearing the filter cover 4, and impurities enter the other side (the second end side) of the movable ring 8 through the central through hole of the movable ring 8. Then the movable ring 8 is reset, and when it moves away from the water inlet direction (the second end) of the filter cartridge 1, it will drive the filtered material on the second end side of the movable ring 8 to move, and the impurities can be discharged from the extrusion tube 2.

[0053] In order to prevent impurities from flowing back from the central through hole of the filter ring to the first end side, a cylindrical protrusion adapted to the central through hole of the movable ring 8 is provided on the inner side of the second end surface of the filter cylinder 1, and a cylindrical section without filter holes is provided at the second end of the filter cover 4, and the extrusion tube 2 connects the cavity between the cylindrical protrusion and the filter cover 4; the movable ring 8 is provided with a switch valve 14 and an elastic one-way valve 13 connecting its two side surfaces.

[0054] Filter cotton is arranged in the valve body of the switch valve 14, and the connection direction of the elastic one-way valve 13 is from the first side surface of the movable ring 8 to the second side surface thereof.

[0055] The movable ring 8 moves continuously toward the second end. After the movable ring 8 is plugged into the cylindrical protrusion at one end of the filter cartridge 1, the opened switch valve 14 continues to move toward the second end to extrude and dehydrate the accumulated filtrate. Then, the switch valve 14 is closed, the extrusion tube 2 is opened, and the filtrate after extrusion and dehydration is taken out, while the other parts of the filter cover 4 continue to filter the wastewater.

[0056] The filter cotton provided can squeeze and dehydrate the filtrate accumulated on the other side of the movable ring 8 when the switch valve 14 is opened and the movable ring 8 moves away from the water inlet of the filter cartridge 1. The design of the cylindrical section without filter holes is convenient for squeezing and dehydrating the filtrate.

[0057] The multiple elastic one-way valves 13 can allow water to flow from the first side to the second side of the moving ring 8 , but cannot flow back, thereby accelerating the speed at which impurities enter the second side of the moving ring 8 .

[0058] like Figure 3 , Figure 4 and Figure 5 As shown, a turbine blade 16 is disposed on a first side of the rotating ring 12 , and a brush 15 is fixedly connected to a second side of the rotating ring 12 , and the bristles of the brush 15 are in contact with the inner side of the filter cover 4 .

[0059] When the movable ring 8 moves toward the water inlet of the filter cartridge 1, the turbine blades 16 drive the rotating ring 12 and the brush 15 to rotate under the action of the water flow. When the turbine blades 16 rotate, a small vortex is formed near the inner wall of the filter cover 4. The small vortex draws out the filtered material in the sieve holes of the filter cover 4 and flows along the inclined surface to the other side of the movable ring 8. The rotation of the brush 15 can clear the cleared surface of the filter cover 4 for a second time.

[0060] Embodiment 2

[0061] A drainage pipe 3 connected to the water outlet is disposed on the outer side of the second end surface of the filter cartridge 1. A water turbine 10 is disposed inside the drainage pipe 3. The shaft end of the water turbine 10 extends into the filter cartridge 1 and is fixedly connected to the gear ring assembly 11.

[0062] The filter cover 4 is rotatably connected to the filter cartridge 1 via an annular sliding assembly. The outer ring surface of the filter cover 4 is provided with an outer wall toothed ring 9, which is meshed with a toothed ring assembly 11. The water turbine 10 drives the filter cover 4 to rotate.

[0063] The waste water filtered by the filter cover 4 is discharged along the drain pipe 3, and the water turbine 10 is driven to rotate during the discharge process, thereby realizing the rotation of the gear ring group 11, and the gear ring group 11 drives the outer wall gear ring 9 to rotate, thereby realizing the corresponding rotation of the filter cover 4. The rotation direction of the filter cover 4 is preferably opposite to the rotation direction of the rotating ring 12, which can increase the cleaning speed of the filter cover 4.

[0064] At the same time, a stirring assembly is provided between the filter cartridge 1 and the filter cover 4. The stirring assembly is rotationally connected to the filter cartridge 1 through an annular sliding assembly. An inner wall gear ring 7 is connected to the stirring assembly. The inner wall gear ring 7 is meshed with the gear ring group 11. The water turbine 10 drives the stirring assembly to rotate.

[0065] The stirring assembly includes: a plurality of levers 6 and lever rings distributed in a ring array, two lever rings are respectively arranged at the two ends of the filter cartridge 1, and the two ends of the lever 6 are respectively fixedly connected to the two lever rings, and the inner wall toothed ring 7 is arranged on one of the lever rings.

[0066] The toothed ring group 11 simultaneously drives the outer wall toothed ring 9 and the inner wall toothed ring 7 to rotate, thereby realizing the corresponding rotation of the filter cover 4 and the lever 6, so that the wastewater passes through the side of the filter cover 4 evenly under the action of gravity. In addition, by rotating a number of levers 66, the wastewater in the filter cartridge 1 can be slowly stirred for a second time, and the flow rate is reduced, thereby increasing the mixing reaction time of the flocculant and the filtered wastewater, thereby ensuring the flocculation effect.

[0067] Finally, because both the filter cover 4 and the stirring assembly need to be rotatably connected to the filter cartridge 1, an annular sliding assembly structure is provided, including: an annular sliding groove and an annular sliding edge, the annular sliding edge is arranged on the end face or inner side face of the filter cartridge 1, and the annular sliding groove is arranged on the end face of the filter cover 4 or the stirring assembly.

[0068] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments / methods or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0069] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0070] It should be understood by those skilled in the art that the above embodiments are only for the purpose of clearly illustrating the present invention, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above invention, and these changes or modifications are still within the scope of the present invention.

Claims

1. A natural gas purification production wastewater treatment device, characterized in that: include: A filter cartridge (1) having a closed first end surface and a closed second end surface; A filter cover (4) is arranged inside the filter cartridge (1), and two ends of the filter cover (4) are rotatably connected to two end surfaces of the filter cartridge (1) respectively; A cleaning component is arranged inside the filter cover (4) and is movable along the central axis of the filter cover (4), the circumferential surface of the cleaning component being in contact with the inner side surface of the filter cover (4); The water inlet of the filter cartridge (1) is arranged on a first end surface of the filter cartridge (1) and is in communication with the interior of the filter cover (4); the water outlet of the filter cartridge (1) is arranged on a second end surface of the filter cartridge (1) and is in communication with the cavity between the inner side surface of the filter cartridge (1) and the outer side surface of the filter cover (4); An extrusion tube (2) communicating with the interior of the filter cover (4) is provided on the second end surface of the filter cartridge (1).

2. A natural gas purification production wastewater treatment device according to claim 1, characterized in that: The cleaning component comprises: A plurality of screw rods (5), wherein the plurality of screw rods (5) are arranged parallel to the central axis of the filter cover (4), and the two ends of the plurality of screw rods (5) are respectively connected to the two end surfaces of the filter cartridge (1); a moving ring (8) coaxially arranged in the filter cover (4), and the moving ring (8) is provided with a plurality of through holes corresponding to the screw rod (5), and the moving ring (8) slides relative to the filter cover (4) through the through holes and the screw rod (5); A rotating ring (12) is coaxially arranged with the movable ring (8), and the inner ring surface of the rotating ring (12) is rotatably connected with the outer ring surface of the movable ring (8), and the outer ring surface of the rotating ring (12) contacts the inner side surface of the filter cover (4).

3. A natural gas purification production wastewater treatment device according to claim 2, characterized in that: The plurality of screw rods (5) are distributed in a circular array, one of the plurality of through holes is provided with an internal thread meshing with the screw rod (5), and the screw rod (5) connected to the through hole provided with the internal thread extends outwardly and is connected to a drive shaft of a motor provided on the second end face of the filter cartridge (1).

4. A natural gas purification production wastewater treatment device according to claim 2, characterized in that: The first side surface of the rotating ring (12) is provided with turbine blades (16), and the second side surface of the rotating ring (12) is fixedly connected with a brush (15), and the bristles of the brush (15) are in contact with the inner side surface of the filter cover (4).

5. A natural gas purification production wastewater treatment device according to claim 2, characterized in that: A cylindrical protrusion adapted to the central through hole of the movable ring (8) is arranged on the inner side of the second end surface of the filter cartridge (1); a cylindrical section without filter holes is arranged at the second end of the filter cover (4); and the extrusion tube (2) is connected to the cavity between the cylindrical protrusion and the filter cover (4); The movable ring (8) is provided with a switch valve (14) and an elastic one-way valve (13) which communicate with the two side surfaces thereof.

6. A natural gas purification production wastewater treatment device according to claim 5, characterized in that: Filter cotton is arranged in the valve body of the switch valve (14), and the connection direction of the elastic one-way valve (13) is from the first side surface of the movable ring (8) to the second side surface thereof.

7. A natural gas purification production wastewater treatment device according to claim 1, characterized in that: A drainage pipe (3) communicating with the water outlet is arranged on the outer side surface of the second end surface of the filter cartridge (1), a water turbine (10) is arranged inside the drainage pipe (3), and the shaft end of the water turbine (10) extends into the filter cartridge (1) and is fixedly connected to a gear ring assembly (11); The filter cover (4) is rotatably connected to the filter cartridge (1) via an annular sliding assembly; an outer wall toothed ring (9) is provided on the outer ring surface of the filter cover (4); the outer wall toothed ring (9) is meshed with the toothed ring group (11); and the water turbine (10) drives the filter cover (4) to rotate.

8. A natural gas purification production wastewater treatment device according to claim 7, characterized in that: A stirring assembly is provided between the filter cartridge (1) and the filter cover (4); the stirring assembly is rotationally connected to the filter cartridge (1) via an annular sliding assembly; an inner wall toothed ring (7) is connected to the stirring assembly; the inner wall toothed ring (7) is meshed with the toothed ring group (11); and the water turbine (10) drives the stirring assembly to rotate.

9. A natural gas purification production wastewater treatment device according to claim 8, characterized in that: The stirring assembly comprises: a plurality of shifting rods (6) and shifting rings distributed in a ring array, two of the shifting rings being respectively arranged at the two ends of the filter cartridge (1), and the two ends of the shifting rod (6) being respectively fixedly connected to the two shifting rings, and the inner wall toothed ring (7) being arranged on the shifting rings.

10. A natural gas purification production wastewater treatment device according to claim 8, characterized in that: The annular sliding assembly comprises an annular sliding groove and an annular sliding edge, wherein the annular sliding edge is arranged on the end surface or the inner side surface of the filter cartridge (1), and the annular sliding groove is arranged on the end surface of the filter cover (4) or the stirring assembly.

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