An internal pressure type pre-filter with positive and back flushing functions

Abstract

This utility model relates to an internal pressure pre-filter with both forward and backwashing functions. The pre-filter body includes a head with inlet and outlet, a filter bottle, a filter element, a frame, and a drain component. The frame has a drain channel that communicates with the inlet end of the filter element. The bottom of the frame also has a drain channel switching mechanism for forward and backwashing. The drain channel switching mechanism has a first channel opening, and a second channel opening is provided between the drain channel switching mechanism and the filter element frame. The second channel opening can be opened or closed with the axial relative movement of the drain channel switching mechanism and the filter element frame. When the second channel opening is closed, a first drain channel is formed between the drain channel, the first channel opening, and the drain component, realizing backwashing. When the second channel opening is open, a second drain channel is formed between the drain channel, the second channel opening, the first channel opening, and the drain component, realizing forward washing. The drain channel switching mechanism and the filter element frame are directly or indirectly axially sealed.

Description

Technical Field

[0001] This utility model relates to an internal pressure pre-filter that has both forward and backwashing functions, belonging to the technical field of water purification equipment. Background Technology

[0002] Municipal tap water suffers from secondary pollution such as pipe corrosion and sediment, leading to deterioration of household water quality. Pre-filters are typically installed on the inlet pipes to improve water quality. Existing pre-filters typically include: a unit, a filter bottle connected to the unit at the top, and a drain ball valve connected to the bottom of the filter bottle. The filter bottle contains a filter screen frame, and the filter screen is fitted onto the outer wall of the frame; collectively, this is called the filtration mechanism. Pre-filters are classified into external pressure pre-filters and internal pressure pre-filters based on the direction of water inflow. In the external pressure type, water flows from the inlet of the unit into the gap between the filter bottle and the filter screen, is filtered by the screen, flows into the center of the filter screen frame, and then flows from the center of the frame to the outlet of the unit. In the internal pressure type, water flows from the inlet of the unit into the center of the filter screen frame, is filtered from the inside out, flows into the gap between the filter bottle and the filter screen, and then flows to the outlet of the unit.

[0003] Currently, most pre-filters on the market use a mesh or disc filter structure. Cleaning methods include forward flushing, backflushing, and siphon cleaning. These methods, because they do not require adjustment of the pre-filter's installation position, are often referred to as in-situ self-cleaning. However, due to structural limitations, existing pre-filters cannot switch their drainage channels according to operating conditions, resulting in a single cleaning method: either forward flushing (directly rinsing the filter surface through the inlet) or backflushing. There is no way to freely switch between forward and backflushing to thoroughly clean the filter mechanism.

[0004] The Chinese invention patent CN208244205U, published on December 18, 2018, describes an internal pressure pre-filter with forward and backwash functions. The pre-filter body includes a head, filter bottle, filter element, frame, and a drain component at the bottom of the filter bottle. The frame has a drain channel, and its top connects to the water inlet of the filter element. The bottom of the frame also has a drain channel switching mechanism for forward and backwash functions. This mechanism has a first channel opening and a second channel opening. The second channel opening can be opened or closed. When the second channel opening is closed, a first drain channel is formed between the drain channel outlet, the first channel opening, and the drain component. When the second channel opening is open, a second drain channel is formed between the second channel opening, the first channel opening, and the drain component. The inner wall of the filter bottle and the drain channel switching mechanism are directly or indirectly rotated and sealed below the second channel opening. This invention has a reasonable structural design, is easy to manufacture, and allows for convenient switching of the drain channel. However, it still has the following shortcomings: the sealing method of the pre-filter has certain defects that lead to water leakage, and the flow channel switching still needs to be optimized and improved to enhance the convenience and efficiency of flow channel switching, avoid interference between drainage channels, prevent the deposition of impurities, and thus improve the cleaning effect of forward flushing and backwashing. To address these issues, the researchers of this application, through structural optimization design and experimental simulation, developed an internal pressure pre-filter that combines forward flushing and backwashing functions, achieving good results and improving the service life and reliability of the pre-filter. Utility Model Content

[0005] One of the purposes of this invention is to address the shortcomings of existing pre-filters by providing an internal pressure pre-filter that combines forward and backwashing functions. Through structural optimization and experimental simulation, it has achieved good results, effectively improving the sealing effect and flow channel switching effect, resulting in high flushing efficiency and extending the service life and reliability of the pre-filter.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] An internal pressure pre-filter with both forward and backwashing functions includes a pre-filter body. The pre-filter body includes a head with inlet and outlet ports, a filter bottle connected to the head, a filter element placed inside the filter bottle, a frame inside the filter element, and a drain component at the bottom of the filter bottle. The frame has a drain channel that communicates with the inlet end of the filter element. The bottom of the frame also has a drain channel switching mechanism for forward and backwashing. The drain channel switching mechanism has a first channel opening, and a second channel opening is provided between the drain channel switching mechanism and the filter element frame. The second channel opening can be opened or closed with the axial relative movement of the drain channel switching mechanism and the filter element frame. When the second channel opening is closed, a first drain channel is formed between the drain channel, the first channel opening, and the drain component, realizing backwashing. When the second channel opening is open, a second drain channel is formed between the drain channel, the second channel opening, the first channel opening, and the drain component, realizing forward washing. The drain channel switching mechanism and / or the filter element frame are directly or indirectly sealed to the inner wall of the filter bottle.

[0008] Preferably, the internal pressure pre-filter is further provided with a drive assembly, including a drive unit, an assembly unit and a sealing unit. The head is provided with a drive port. The drive unit and the drive port are rotatably and detachably connected. The filter element skeleton is sleeved on the assembly unit. The sealing unit is adapted to the sewage discharge channel of the sewage discharge component. The drainage channel switching mechanism is located on the lower side of the filter element skeleton and is fixed relative to the filter bottle. The drive assembly can drive the filter element skeleton to move axially relative to the drainage channel switching mechanism.

[0009] Preferably, the internal pressure pre-filter is further provided with a drive assembly, including a drive unit, an assembly unit and a sealing unit. The head is provided with a drive port, the drive unit and the drive port are rotatably and detachably connected, the filter element skeleton is sleeved on the assembly unit, the sealing unit is adapted to the sewage discharge channel of the sewage discharge component, the drainage flow channel switching mechanism is fixed to the lower end of the drive assembly, and the drive assembly can drive the drainage flow channel switching mechanism to run axially relative to the filter element skeleton.

[0010] Preferably, the drive port is provided with an internal thread, and the drive unit is provided with an external thread. The drive unit is a drive shaft that can be detachably connected by rotating through the cooperation of the internal and external threads.

[0011] Preferably, the assembly unit has a drive connection part at one end, which is detachably connected to the drive unit, and a first assembly part and a second assembly part at the other end opposite to the drive connection part. The first assembly part is used to fix the filter element frame or drainage channel switching mechanism to be driven, and the second assembly part is used to fix the sealing unit.

[0012] Preferably, the drive unit is the inner skeleton of the filter unit skeleton, and the inner skeleton is provided with at least one siphon flow channel and / or a scraping component in the axial direction; the sealing unit is composed of a sealing shaft and a sealing ring sleeved on the sealing shaft, and the sealing shaft includes a connecting part, a main body part and an end part, wherein the diameter of the end part is smaller than the diameter of the main body part.

[0013] Preferably, the filter element frame is provided with an axial limiting mechanism for controlling the axial movement distance of the drive assembly.

[0014] Preferably, the end of the drive shaft is provided with a drive interface, and the drive interface is fixedly provided with a manual drive component or an electric drive component.

[0015] Preferably, the assembly unit and the drainage channel switching mechanism are snap-fitted together or integrally injection molded.

[0016] Preferably, the machine head is provided with an isolation bushing that can isolate the machine head from water. The isolation bushing is made of an inert material or at least the surface in contact with water is coated with an inert material coating. The inert material is selected from any one of rubber, plastic and ceramic. The filter bottle is also provided with a water hammer structure. The filter element is a filter screen or a filter disc.

[0017] The beneficial effects of this utility model are: through structural optimization design and experimental simulation, good results have been achieved, which can effectively improve the sealing effect and flow channel switching effect. Through in-situ forward flushing and back flushing, the flushing efficiency is high, and the service life and reliability of the pre-filter are improved. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is an exploded view of the present invention;

[0020] Figure 3 This is a partial schematic diagram of the present invention;

[0021] Figure 4 This is a cross-sectional view of the present invention (in filtered state);

[0022] Figure 5 This is a cross-sectional view of the present invention (in the forward flushing state), where A indicates that the second channel is open and B indicates that the first channel is open;

[0023] Figure 6 This is a cross-sectional view of the present invention (in the backwashing state), where A indicates that the second channel is closed and B indicates that the first channel is open.

[0024] In the diagram: 1. Machine head, 2. Filter bottle, 3. Filter element, 4. Drainage component, 5. Drainage channel switching mechanism, 6. Inner frame, 7. Sealing unit, 8. Scraper component, 9. Siphon channel. Detailed Implementation

[0025] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0026] Example 1:

[0027] like Figure 1-6 As shown, an internal pressure pre-filter with both forward and backwashing functions includes a pre-filter body. The pre-filter body includes a head 1 with inlet and outlet ports, a filter bottle 2 connected to the head 1, a filter element 3 placed inside the filter bottle 2, a frame inside the filter element 3, and a drain component 4 at the bottom of the filter bottle 2. The frame has a drain channel that communicates with the inlet end of the filter element 3. The bottom of the frame also has a drain channel switching mechanism 5 for forward and backwashing. The drain channel switching mechanism 5 has a first channel opening. A second channel opening is provided between the structure 5 and the filter element 3 frame. The second channel opening can be opened or closed with the axial relative movement of the drainage channel switching mechanism 5 and the filter element 3 frame. When the second channel opening is closed, a first drainage channel is formed between the drainage channel, the first channel opening and the drainage component 4 to achieve backwashing. When the second channel opening is open, a second drainage channel is formed between the drainage channel, the second channel opening and the first channel opening and the drainage component 4 to achieve forward washing. The drainage channel switching mechanism 5 and / or the filter element 3 frame are directly or indirectly sealed with the inner wall of the filter bottle 2.

[0028] Specifically, the internal pressure pre-filter also includes a drive assembly, comprising a drive unit, an assembly unit, and a sealing unit. The head 1 has a drive port, and the drive unit is rotatably and detachably connected to the drive port. The filter element 3 frame is fitted onto the assembly unit. The sealing unit is adapted to the sewage discharge channel of the sewage discharge component. The drainage channel switching mechanism 5 is fixed to the lower end of the drive assembly. The drive assembly can drive the drainage channel switching mechanism 5 to move axially relative to the filter element 3 frame. The drive port has an internal thread, and the drive unit has an external thread. They are rotatably and detachably connected through the cooperation of the internal and external threads. The drive unit is a drive shaft.

[0029] Specifically, the assembly unit has a drive connection part at one end, which is detachably connected to the drive unit. The other end opposite to the drive connection part has a first assembly part and a second assembly part. The first assembly part is used to fix the filter element 3 frame or the drainage channel switching mechanism 5 to be driven, and the second assembly part is used to fix the sealing unit.

[0030] Specifically, the drive unit is the inner frame 6 of the filter unit 3 skeleton, and the inner frame is provided with at least one siphon flow channel 9 and / or a scraping component 8 in the axial direction; the sealing unit is composed of a sealing shaft and a sealing ring sleeved on the sealing shaft, and the sealing shaft includes a connecting part, a main body part and an end part, wherein the diameter of the end part is smaller than the diameter of the main body part.

[0031] Specifically, the filter element 3 has an axial limiting mechanism inside its frame to control the axial movement distance of the drive assembly.

[0032] Specifically, the end of the drive shaft is provided with a drive interface, and the drive interface is fixedly provided with a manual drive component or an electric drive component.

[0033] Specifically, the assembly unit and the drainage channel switching mechanism 5 are either snap-fitted together or integrally injection molded.

[0034] Specifically, the head 1 is provided with an isolation bushing that can isolate the head 1 from water. The isolation bushing is made of an inert material or at least the surface in contact with water is coated with an inert material coating. The inert material is selected from any one of rubber, plastic and ceramic. The filter bottle 2 is also provided with a water hammer structure. The filter element is a filter screen or filter disc.

[0035] The beneficial effects of this utility model are: through structural optimization design and experimental simulation, good results have been achieved, which can effectively improve the sealing effect and flow channel switching effect. Through in-situ forward flushing and back flushing, the flushing efficiency is high, and the service life and reliability of the pre-filter are improved.

[0036] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims. For example, as a parallel embodiment, the internal pressure pre-filter is further provided with a drive assembly, including a drive unit, an assembly unit, and a sealing unit. The head 1 is provided with a drive port, and the drive unit is rotatably and detachably connected to the drive port. The filter element 3 frame is fitted onto the assembly unit. The sealing unit is adapted to the drain channel of the drain component. The drain flow channel switching mechanism 5 is located below the filter element 3 frame and is fixed relative to the filter bottle 2. The drive assembly can drive the filter element 3 frame to move axially relative to the drain flow channel switching mechanism 5.

Claims

1. An internal pressure pre-filter with both forward and backwashing functions, comprising a pre-filter body, the pre-filter body comprising a head (1) with inlet and outlet, a filter bottle (2) connected to the head (1), a filter element (3) placed inside the filter bottle (2), a frame disposed inside the filter element (3), and a drain component (4) disposed at the bottom of the filter bottle (2), the frame having a drain channel and communicating with the inlet end of the filter element (3), characterized in that: The bottom of the frame is also provided with a drainage channel switching mechanism (5) for forward flushing and backflushing. The drainage channel switching mechanism (5) is provided with a first channel opening. A second channel opening is provided between the drainage channel switching mechanism (5) and the filter element (3) frame. The second channel opening can be opened or closed with the axial relative movement of the drainage channel switching mechanism (5) and the filter element (3) frame. When the second channel opening is closed, a first drainage channel is formed between the drainage channel, the first channel opening and the drainage component (4) to achieve backflushing. When the second channel opening is open, a second drainage channel is formed between the drainage channel, the second channel opening, the first channel opening and the drainage component (4) to achieve forward flushing. The drainage channel switching mechanism (5) and / or the filter element (3) frame are directly or indirectly sealed with the inner wall of the filter bottle (2). The internal pressure pre-filter is also provided with a drive assembly, which can drive the filter element (3) frame and the drainage channel switching mechanism (5) to move relative to each other axially.

2. The internal pressure pre-filter with both forward and backwashing functions according to claim 1, characterized in that, The drive assembly includes a drive unit, an assembly unit, and a sealing unit (7). The head (1) is provided with a drive port. The drive unit is rotatably and detachably connected to the drive port. The filter element (3) skeleton is fitted onto the assembly unit. The sealing unit (7) is adapted to the sewage discharge channel of the sewage discharge component. The drainage channel switching mechanism (5) is located on the lower side of the filter element (3) skeleton and is fixed relative to the filter bottle (2). The drive assembly can drive the filter element (3) skeleton to move axially relative to the drainage channel switching mechanism (5).

3. The internal pressure pre-filter with both forward and backwashing functions according to claim 1, characterized in that, The drive assembly includes a drive unit, an assembly unit and a sealing unit (7). The head (1) is provided with a drive port. The drive unit and the drive port are rotatably and detachably connected. The filter element (3) skeleton is fitted onto the assembly unit. The sealing unit (7) is adapted to the sewage discharge channel of the sewage discharge component. The drainage channel switching mechanism (5) is fixed to the lower end of the drive assembly. The drive assembly can drive the drainage channel switching mechanism (5) to run axially relative to the filter element (3) skeleton.

4. An internal pressure pre-filter with both forward and backwashing functions as described in claim 2 or 3, characterized in that, The drive port is provided with an internal thread, and the drive unit is provided with an external thread. They are detachably connected by rotation through the cooperation of the internal and external threads. The drive unit is a drive shaft.

5. An internal pressure pre-filter with both forward and backwashing functions as described in claim 2 or 3, characterized in that, The assembly unit is provided with a drive connection part at one end, which is detachably connected to the drive unit. The other end opposite to the drive connection part is provided with a first assembly part and a second assembly part. The first assembly part is used to fix the filter element (3) frame or drainage channel switching mechanism (5) to be driven, and the second assembly part is used to fix the sealing unit (7).

6. An internal pressure pre-filter with both forward and backwashing functions according to claim 5, characterized in that, The drive unit is the inner skeleton (6) of the filter element (3) skeleton, and the inner skeleton is provided with at least one siphon flow channel (9) and / or a scraping component (8) in the axial direction; the sealing unit (7) is composed of a sealing shaft and a sealing ring sleeved on the sealing shaft. The sealing shaft includes a connecting part, a main body part and an end part, wherein the diameter of the end part is smaller than the diameter of the main body part.

7. An internal pressure pre-filter with both forward and backwashing functions as described in claim 2 or 3, characterized in that, The filter element (3) has an axial limiting mechanism inside its frame, which is used to control the axial movement distance of the drive assembly.

8. An internal pressure pre-filter with both forward and backwashing functions according to claim 4, characterized in that, The end of the drive shaft is provided with a drive interface, and the drive interface is fixedly provided with a manual drive component or an electric drive component.

9. An internal pressure pre-filter with both forward and backwashing functions according to claim 3, characterized in that, The assembly unit and the drainage channel switching mechanism (5) are snapped together or integrally injection molded.

10. An internal pressure pre-filter with both forward and backwashing functions according to claim 1, characterized in that, The head (1) is provided with an isolation bushing that can isolate the head (1) from water. The isolation bushing is made of an inert material or at least the surface in contact with water is coated with an inert material coating. The inert material is selected from any one of rubber, plastic and ceramic. The filter bottle (2) is also provided with a water hammer structure. The filter element is a filter screen or a filter disc.

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