A self-cleaning filter device and a drain cleaning truck

Abstract

This invention provides a self-cleaning filtration device and a drain cleaning cart. The device includes: a housing; a filter screen disposed within the housing; a perforated plate disposed within the filter screen, forming a clean water chamber; a wastewater inlet communicating with the wastewater chamber; a wastewater outlet communicating with the wastewater chamber; and a clean water outlet communicating with the clean water chamber and optionally connected to a clean water pipeline and an air pipeline. When connected to the clean water pipeline, clean water from the clean water chamber is output; when connected to the air pipeline, external air enters the clean water chamber through the air pipeline, forming a high-speed airflow. The high-speed airflow mixes with the clean water in the clean water chamber and passes through the perforated plate to form a high-pressure jet that washes the filter screen. The beneficial effects of this invention are: filtration operates under negative pressure inside the housing; when cleaning the filter screen is required, external air at normal pressure is introduced, creating a pressure difference between the clean water chamber and the wastewater chamber, thereby forming a jet through the perforated plate to wash the filter screen.

Description

Technical Field

[0001] This invention relates to the field of filtration equipment technology, and in particular to a filtration device and a dredging vehicle with self-cleaning function. Background Technology

[0002] Combined sewage cleaning trucks (sewer cleaning trucks) extend their cleaning time by using treated sewage from a continuous sewage filtration system as a cleaning water source, thereby significantly improving their overall work efficiency. Existing combined sewage cleaning trucks typically employ multi-layer, multi-stage filtration, resulting in low filtration efficiency, low filtration precision, and easy clogging of the filters, making cleaning difficult. To address the cleaning issues of sewage filtration systems, self-cleaning continuous sewage filtration devices are increasingly being applied to combined sewage cleaning trucks.

[0003] However, current self-cleaning sewage filtration devices applied to combined dredging trucks present some problems. For example, the sewage filtration devices involved in Chinese patents with application numbers 202111518250.0 and 201610880683.3 rely on brushes or scrapers contacting the filter screen surface, creating relative movement to clean the screen. However, the filter screen has a certain thickness, and the scraper or brush can only clean the surface, failing to clean the internal pores. Furthermore, due to the contact cleaning method, the brush or scraper and the filter screen are prone to wear, resulting in a short effective working time and unsatisfactory cleaning effect. Summary of the Invention

[0004] In view of this, in order to solve the cleaning problem of applying sewage filtration devices to combined dredging trucks, embodiments of the present invention provide a filtration device and a dredging truck with self-cleaning function.

[0005] An embodiment of the present invention provides a filter device with a self-cleaning function, comprising:

[0006] shell;

[0007] A filter screen, which is cylindrical, is disposed inside the outer casing to form a wastewater chamber between the filter screen and the outer casing;

[0008] A perforated plate, which is cylindrical in shape, is disposed on the filter screen, and a clear water cavity is formed inside the perforated plate;

[0009] A sewage inlet, which is connected to the sewage chamber, is used to input sewage into the sewage chamber;

[0010] A sewage outlet is connected to the sewage chamber to create negative pressure inside the outer shell, thereby drawing out the sewage from the sewage chamber and creating a negative pressure state inside the outer shell.

[0011] It also includes a clean water outlet, which is connected to the clean water chamber and can be optionally connected to a clean water pipeline and an air pipeline. When the clean water pipeline is connected, the clean water in the clean water chamber is output. When the air pipeline is connected, external air enters the clean water chamber through the air pipeline to form a high-speed airflow. The high-speed airflow mixes with the clean water in the clean water chamber and passes through the mesh plate to form a high-pressure jet to wash the filter screen.

[0012] Furthermore, a first check valve is provided on the clean water pipeline so that the clean water flowing out of the clean water outlet can flow along the clean water pipeline; a second check valve is provided on the air pipeline so that outside air can flow into the clean water outlet along the air pipeline.

[0013] Furthermore, it also includes a motor, a bearing, and a spacer, wherein one end of the filter screen is connected to the motor and the other end is connected to the outer ring of the bearing, and one end of the spacer is connected to the inner ring of the bearing and the other end is connected to the mesh plate.

[0014] Furthermore, it also includes a hollow central shaft with an inner hole serving as the water outlet. One end of the central shaft is inserted into the inner ring of the bearing, and the other end extends out of the outer casing.

[0015] Furthermore, it also includes a limiting sleeve and a coupling. The limiting sleeve is disposed inside one end of the filter screen and is fixedly connected to the filter screen. The output end of the motor is connected to the coupling. The coupling is inserted into the limiting sleeve and connected to the limiting sleeve.

[0016] Furthermore, the interior of the outer shell is a cylindrical cavity, and the filter screen, the perforated plate, and the inner cavity of the outer shell are coaxially arranged.

[0017] Furthermore, the outer shell includes an outer cylinder and a side cover plate. One side of the outer cylinder is provided with a side opening. The side cover plate is fixedly connected to the side opening cover. An arc-shaped guide block is provided on the inner side of the side cover plate. A high-pressure nozzle is also provided through the side cover plate.

[0018] In addition, embodiments of the present invention also provide a dredging vehicle, including the above-mentioned filter device with self-cleaning function, and further including a sewage tank and a clean water tank, wherein the sewage inlet and the sewage outlet are respectively connected to the sewage tank through pipelines, and the clean water pipeline is connected to the clean water tank through pipelines.

[0019] Furthermore, the sewage outlet includes a first sewage outlet and a second sewage outlet, wherein the first sewage outlet is connected to the sewage tank through a sewage output pipeline, and a first valve is provided on the sewage output pipeline; the second sewage outlet is connected to the sewage output pipeline through a bypass pipeline, and a second valve is provided on the bypass pipeline.

[0020] Furthermore, the first valve is a manual ball valve, and the second valve is an automatic ball valve.

[0021] The beneficial effects of the technical solutions provided by the embodiments of the present invention are as follows:

[0022] 1. The present invention provides a self-cleaning filter device in which the filter works under negative pressure inside the outer shell. When the filter needs to be cleaned, external normal pressure air is introduced to form a pressure difference between the clean water chamber and the wastewater chamber, thereby forming a jet through the mesh plate to wash the filter, achieving deep cleaning of the filter. No auxiliary equipment such as brushes or scrapers are needed, and the filter will not be damaged.

[0023] 2. The present invention provides a dredging vehicle that filters sewage collected in the sewage pipe through a filter screen, and uses a negative pressure sewage tank to draw sewage from the sewage chamber and create a negative pressure state inside the outer shell. The filtered water is then returned to the clean water tank through a clean water pipeline. When the filter screen needs to be cleaned, sewage filtration is stopped, and external atmospheric pressure air is introduced. The pressure difference forms a jet to clean the filter screen. The filter screen can be cleaned on-site at the dredging vehicle's work site. It can adapt to different external working environments and achieve long-term continuous operation to improve work efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a filter device with self-cleaning function applied to a dredging vehicle according to an embodiment of the present invention;

[0025] Figure 2 This is the structural principle of a self-cleaning filter device according to an embodiment of the present invention. Figure 1 ;

[0026] Figure 3 This is the structural principle of a self-cleaning filter device according to an embodiment of the present invention. Figure 2 ;

[0027] Figure 4 This is a perspective view of a filter device with self-cleaning function according to an embodiment of the present invention;

[0028] Figure 5 This is a side view of a filter device with self-cleaning function according to an embodiment of the present invention;

[0029] Figure 6 This is a front view of a filter device with self-cleaning function according to an embodiment of the present invention;

[0030] Figure 7 This is an internal structural diagram of a filter device with self-cleaning function according to an embodiment of the present invention;

[0031] Figure 8This is a cross-sectional view of a filter device with self-cleaning function according to an embodiment of the present invention;

[0032] Figure 9 This is a 3D view of the side cover.

[0033] In the diagram: 1-Self-cleaning filter, 2-Sewage tank, 3-Clean water tank, 4-Vacuum pump, 5-Normally open ball valve, 6-High-pressure sewage pump, 7-Clean water pipeline, 8-Air pipeline, 9-First check valve, 10-Second check valve, 11-Bypass pipeline, 12-Sewage output pipeline, 13-First valve, 14-Second valve, 15-Sewage input pipeline, 16-Sewage pipe, 17-Flushing pipeline;

[0034] 101-Outer shell, 102-Outer cylinder, 103-Side cover plate, 104-Motor, 105-Sewage inlet, 106-First sewage outlet, 107-Second sewage outlet, 108-Clear water outlet, 109-High pressure nozzle, 110-Filter screen, 111-Perforated plate, 112-Coupling, 113-Motor support, 114-Bearing, 115-Lower end cover, 116-Upper end cover, 117-Spacer sleeve, 118-Central shaft, 119-Guide block, 120-Guide hole, 121-Sewage chamber, 122-Clear water chamber, 123-Support ring, 124-Limit sleeve. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described below in conjunction with the accompanying drawings. The following description presents a preferred embodiment of the various possible embodiments of the present invention, intended to provide a basic understanding of the invention, but not intended to identify key or decisive elements of the invention or to limit the scope of protection sought.

[0036] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0037] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures. Also, it should be understood that, for ease of description, the dimensions of the various parts shown in the figures are not drawn to actual scale.

[0039] In the description of this invention, it should be noted that the circuits, electronic components, and modules involved in this invention are all prior art, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this invention does not involve improvements to the internal structure and methods.

[0040] It should be further noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] Please refer to Figure 2 and 3 The present invention provides a filter device 1 with a self-cleaning function, including a housing 101, a filter screen 110, a mesh plate 111, a sewage inlet 105, a sewage outlet and a clean water outlet 108.

[0042] like Figure 4 , 7 As shown in Figure 8, the outer shell 101 is hollow, with an internal cylindrical cavity. Specifically, the outer shell 101 mainly consists of an outer cylinder 102 and a side cover plate 103. The upper and lower ends of the outer cylinder 102 are sealed by an upper end cover 116 and a lower end cover 115, respectively. One side of the outer cylinder 102 has a side opening. The side cover plate 103 is fixedly connected to the side opening cover, so that a cylindrical closed internal cavity is formed inside the outer cylinder 102.

[0043] The filter screen 110 is cylindrical and is disposed inside the outer shell 101, specifically coaxially arranged with the inner cavity of the outer shell 101. A sewage chamber 121 is formed between the filter screen 110 and the outer shell 101.

[0044] The perforated plate 111 is also cylindrical and is disposed inside the filter screen 110, coaxially arranged with the filter screen 110. There is a gap between the outer wall of the perforated plate 111 and the inner hole of the filter screen 110, and a clear water cavity 122 is formed inside the perforated plate 111.

[0045] The filter screen 110 can be driven to rotate by a drive mechanism, thereby filtering sewage. As described in this embodiment, the drive mechanism mainly consists of a motor 101, a bearing 114, and a spacer 117. The upper end of the filter screen is connected to the motor 104, and the other end is connected to the outer ring of the bearing 114. One end of the spacer 117 is connected to the inner ring of the bearing 114, and the other end is connected to the mesh plate 111.

[0046] More specifically, such as Figure 5 , 6 As shown in Figure 7, the motor 101 is a hydraulic motor, which is mounted on a motor base 113. The motor base 113 is mounted on one end of the outer cylinder 102. The motor 104 and the filter screen 110 are connected by a limiting sleeve 124 and a coupling 112. The limiting sleeve 112 is disposed inside one end of the filter screen 110 and is fixedly connected to the filter screen 110. The output end of the motor 104 is connected to the coupling 112, and the coupling 112 is inserted into the limiting sleeve 124 and connected to the limiting sleeve.

[0047] The spacer 117 is disposed between the upper part of the bearing 114 and the lower end of the perforated plate 111. A support ring 123 is provided inside the lower end of the perforated plate 111 and is connected to a central shaft 118. The upper end of the central shaft 118 is inserted into both the inner ring of the bearing 114 and the support ring 123. The lower end of the central shaft 118 extends out of the outer shell 101, and the lower end of the spacer 117 is fitted onto the central shaft 118. When the motor 104 drives the filter screen 110 to rotate, the perforated plate 111 remains stationary.

[0048] The sewage inlet 105 is connected to the sewage chamber 121. For example... Figure 1 , 2 As shown in Figure 4, in this embodiment, the sewage inlet 105 is located on the upper part of the side wall of the outer cylinder 102. The sewage inlet 105 is connected to the sewage input pipe 15. The sewage input pipe 15 is equipped with a high-pressure sewage pump 6 to input the sewage to be filtered into the sewage chamber 121.

[0049] The wastewater outlet is connected to the wastewater chamber 121. For example... Figure 1 , 2 As shown in Figure 4, in this embodiment, the sewage outlet is located at the lower part of the side wall of the outer cylinder 102. The sewage outlet is connected to a negative pressure pipeline to draw negative pressure into the outer shell 101 so that the sewage in the sewage chamber 121 is drawn out and the outer shell 101 is in a negative pressure state.

[0050] The clean water outlet 108 is connected to the clean water chamber 122, and can optionally be connected to the clean water pipe 7 and the air pipe 8. For example... Figure 1 , 4As shown in Figure 7, in this embodiment, the central shaft 118 is hollow, with its inner hole serving as the clean water outlet 108. The clean water outlet 108 is connected to both the clean water pipeline 7 and the air pipeline 8. The clean water pipeline 7 is equipped with a first one-way valve 9, allowing the clean water flowing from the clean water outlet 108 to flow along the pipeline. The air pipeline 8 is equipped with a second one-way valve 10, allowing external air to flow into the clean water outlet 108 along the air pipeline 8. Here, one of the first one-way valve 9 or the second one-way valve 10 is open, enabling the clean water outlet 108 to be selectively connected to both the clean water pipeline 7 and the air pipeline 8.

[0051] The above-mentioned self-cleaning filter device 1 has two working states: filtration and cleaning.

[0052] Filtration operation: Wastewater to be filtered is input into the wastewater chamber 121 through the wastewater inlet 105. The filter screen 110 filters the wastewater, retaining impurities in the wastewater in the wastewater chamber 121, and filtered clean water is obtained in the clean water chamber 122. At the same time, the motor 104 drives the filter screen 110 to rotate, generating centrifugal force. The clean water in the clean water chamber 122 is discharged from the clean water outlet 108 and flows along the clean water pipeline 7 to the atmospheric pressure container. The first one-way valve 9 is opened, the second one-way valve 10 is closed, and under the action of negative pressure, the wastewater in the wastewater chamber 121 is discharged from the wastewater outlet 106 or 107.

[0053] Cleaning operation status: Sewage is stopped from being input into the sewage chamber 121 through the sewage inlet 105. After some of the clean water in the clean water chamber 122 is discharged through the clean water outlet 108, external air can enter through the air pipe 8. Under the action of atmospheric pressure, the second one-way valve 10 is pushed open, while the first one-way valve 9 remains closed. The air enters the clean water chamber 122 along the clean water outlet 108, thereby forming a high-pressure airflow in the clean water chamber 122. The high-pressure airflow mixes with some of the remaining clean water in the clean water chamber 122 and forms a high-pressure jet through the mesh plate 111. The high-pressure jet is sprayed onto the filter screen 110 to achieve rinsing of the filter screen 110.

[0054] The self-cleaning filter 1 can intermittently input sewage into the sewage chamber 121 through the sewage inlet 105, so that it alternates between filtration and cleaning modes. During the filtration process, the self-cleaning filter 1 is cleaned at a predetermined cleaning frequency. The appropriate cleaning frequency can be determined through multiple tests based on the actual working conditions.

[0055] Since determining the cleaning frequency requires multiple tests, an unreasonable cleaning frequency set during the testing process can cause the filter screen 110 to become clogged. Therefore, in this embodiment, the side cover plate 103 is also provided with a through-hole high-pressure nozzle 109. After the filter screen 110 becomes clogged, high-pressure water is introduced through the high-pressure nozzle 109 for cleaning, thus avoiding the need to disassemble the outer shell 101 and the filter screen 110.

[0056] Preferably, Figure 9 As shown, the inner side of the side cover plate 103 is provided with an arc-shaped guide block 119. The surface of the guide block 119 guides the water flow in a circular motion, which is beneficial for the centrifugal separation of impurities. In addition, the guide block 103 is also provided with two guide holes 120, one of which is connected to the sewage inlet 104 and the other of which is connected to the first sewage outlet 106.

[0057] In addition, such as Figure 1 As shown, an embodiment of the present invention also provides a dredging truck, including the above-mentioned filter device 1 with self-cleaning function, and also including a sewage tank 2 and a clean water tank 3, that is, the above-mentioned filter device 1 with self-cleaning function is applied to the dredging truck.

[0058] The sewage tank 2 is a negative pressure sewage tank, which is maintained at a stable negative pressure inside by a vacuum pump 4. Generally, the sewage tank 2 is connected to a sewage pipe 16, through which sewage from the underground water network is drawn into the sewage tank 2.

[0059] The clean water tank 3 is an atmospheric pressure water storage container, and its top is equipped with a normally open ball valve 5, so that the inside of the clean water tank 3 is always at atmospheric pressure. The clean water tank 3 is connected to a flushing pipe 17, through which clean water from the clean water tank 3 is output to flush the underground water pipe network.

[0060] In this embodiment, the self-cleaning filter device is connected to both the sewage tank 2 and the clean water tank 3. It filters the sewage in the sewage tank 2 to obtain clean water and inputs the clean water into the clean water tank 3.

[0061] Specifically, the sewage inlet 104 and the sewage outlet are respectively connected to the sewage tank 2 via pipelines, and the clean water outlet 108 is connected to the clean water tank 3 via a pipeline. As in this embodiment, the sewage inlet 104 is connected to the sewage tank 2 via a sewage input pipeline 15, and the clean water pipeline 7 is connected to the clean water tank 3.

[0062] The wastewater outlet includes a first wastewater outlet 106 and a second wastewater outlet 107. The first wastewater outlet 106 is connected to the wastewater tank 2 via a wastewater output pipeline 12, which is equipped with a first valve 13. The second wastewater outlet 107 is connected to the wastewater output pipeline 12 via a bypass pipeline 11, which is equipped with a second valve 14. The first valve 13 is specifically a manual ball valve, and the second valve 14 is specifically an automatic ball valve.

[0063] The opening degree of the first valve 13 is related to the required flow rate of clean water in the clean water tank 3 and the position of the clean water tank 3, and is generally determined by the actual working environment. When the required flow rate of clean water is greater and the height difference between the clean water tank 3 and the outer shell is greater, the opening degree of the first valve 13 is smaller. At this time, the clean water pressure is higher and the flow rate is greater, and the amount of sewage recycled into the sewage tank 2 is smaller. Conversely, the larger the opening degree of the first valve 13, the smaller the clean water flow rate and pressure, and the greater the amount of sewage recycled into the sewage tank 2.

[0064] When the dredging vehicle is working, the self-cleaning filter device 1 is in the filtration working state, and the amount of sewage collected into the sewage tank 2 is generally small. The second valve 14 is automatically closed. However, when it is in the cleaning working state, the second valve 14 is automatically opened, so that the sewage in the sewage chamber 121 is discharged as soon as possible, shortening the cleaning time.

[0065] Furthermore, the dredging vehicle can control the self-cleaning filter 1 to alternate between filtration and cleaning states. Generally, the filtration state lasts longer, while the cleaning state lasts shorter. In this embodiment, the filtration state is set to 30 seconds, and the cleaning state is set to 5 seconds. The switching between the working states is controlled by the timing control of the electronic control system. The control system is simple; it only needs to control the high-pressure sewage pump to stop working, that is, to control the high-pressure sewage pump to stop working for 5 seconds every 30 seconds. The cleaning process is carried out automatically by the gas pressure difference without additional power. When the high-pressure sewage pump 6 starts working, the internal pressure of the outer casing 101 increases, the cleaning process stops automatically, and the filtration state starts.

[0066] In this document, the directional terms such as front, back, top, and bottom are defined based on the position of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that these are relative concepts and can vary depending on different methods of use and placement; the use of these directional terms should not limit the scope of protection claimed in this application.

[0067] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A filter device with a self-cleaning function, characterized in that, include: shell; A filter screen, which is cylindrical, is disposed inside the outer casing to form a wastewater chamber between the filter screen and the outer casing; A perforated plate, which is cylindrical in shape, is disposed on the filter screen, and a clear water cavity is formed inside the perforated plate; A sewage inlet, which is connected to the sewage chamber, is used to input sewage into the sewage chamber; A sewage outlet is connected to the sewage chamber to create negative pressure inside the outer shell, thereby drawing out the sewage from the sewage chamber and creating a negative pressure state inside the outer shell. It also includes a clean water outlet, which is connected to the clean water chamber and can be selectively connected to a clean water pipeline and an air pipeline. When the clean water pipeline is connected, clean water from the clean water chamber is output. When the air pipeline is connected, external air enters the clean water chamber through the air pipeline to form a high-speed airflow. The high-speed airflow mixes with the clean water in the clean water chamber and passes through the mesh plate to form a high-pressure jet that washes the filter screen. The clean water pipeline is equipped with a first one-way valve so that the clean water flowing out of the clean water outlet can flow along the clean water pipeline; the air pipeline is equipped with a second one-way valve so that outside air can flow into the clean water outlet along the air pipeline.

2. The filter device with self-cleaning function as described in claim 1, characterized in that: It also includes a motor, a bearing, and a spacer, wherein one end of the filter screen is connected to the motor and the other end is connected to the outer ring of the bearing, and one end of the spacer is connected to the inner ring of the bearing and the other end is connected to the mesh plate.

3. A filter device with self-cleaning function as described in claim 2, characterized in that: It also includes a hollow central shaft, the inner hole of which is the water outlet, one end of which is inserted into the inner ring of the bearing, and the other end extends out of the outer shell.

4. A filter device with self-cleaning function as described in claim 2, characterized in that: It also includes a limiting sleeve and a coupling. The limiting sleeve is disposed inside one end of the filter screen and is fixedly connected to the filter screen. The output end of the motor is connected to the coupling. The coupling is inserted into the limiting sleeve and connected to the limiting sleeve.

5. A filter device with self-cleaning function as described in claim 1, characterized in that: The interior of the outer shell is a cylindrical cavity, and the filter screen, the perforated plate, and the inner cavity of the outer shell are coaxially arranged.

6. A filter device with self-cleaning function as described in claim 5, characterized in that: The outer shell includes an outer cylinder and a side cover plate. The outer cylinder has a side opening on one side. The side cover plate is fixedly connected to the side opening cover. The inner side of the side cover plate has an arc-shaped guide block. The side cover plate also has a through-hole high-pressure nozzle.

7. A dredging vehicle, characterized in that: The device includes a self-cleaning filter as described in any one of claims 1 to 6, and further includes a wastewater tank and a clean water tank, wherein the wastewater inlet and the wastewater outlet are respectively connected to the wastewater tank via pipelines, and the clean water pipeline is connected to the clean water tank.

8. A dredging vehicle as described in claim 7, characterized in that: The wastewater outlet includes a first wastewater outlet and a second wastewater outlet, wherein the first wastewater outlet is connected to the wastewater tank through a wastewater output pipeline and a first valve is provided on the wastewater output pipeline, and the second wastewater outlet is connected to the wastewater output pipeline through a bypass pipeline and a second valve is provided on the bypass pipeline.

9. A dredging vehicle as described in claim 8, characterized in that: The first valve is a manual ball valve, and the second valve is an automatic ball valve.

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