A front filter device with double-layer filter screen inner pressure structure
The pre-filter device with a double-layer internal pressure structure solves the problems of clogging and difficulty in removing impurities in external pressure single-layer filters, achieving efficient filtration and cleaning, and extending the service life of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YUNFU RUNNING WATER CO LTD
- Filing Date
- 2025-06-26
- Publication Date
- 2026-07-14
AI Technical Summary
In existing technologies, external pressure single-layer pre-filters are prone to clogging, making it difficult to remove sediment and impurities. This is especially problematic in rural areas with poor water quality, where they cannot effectively filter water, thus affecting equipment lifespan and water quality.
It adopts a double-layer filter internal pressure structure, and the raw water is filtered from the inside to the outside. The coarse filter and the fine filter filter impurities of different particle sizes respectively. The impurities settle at the bottom of the device and are cleaned by the drain ball valve and knob to ensure the filter screen is clean.
It achieves efficient filtration of impurities of different particle sizes, reduces equipment clogging, extends service life, improves cleaning effect, and reduces cleaning frequency.
Smart Images
Figure CN224485167U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of double-layer filter internal pressure pre-filtration technology, and in particular to a pre-filtration device with a double-layer filter internal pressure structure. Background Technology
[0002] During transportation, tap water or surface-collected water is easily mixed with large particulate impurities such as silt, rust, and suspended solids, as well as pollutants such as residual colloids and algae. These impurities not only affect water quality, but long-term accumulation can also clog water pipes, damage faucets, water heaters, and other water-related equipment, reduce their lifespan, and even breed bacteria, endangering human health. Therefore, pre-filters, as the "first line of defense" for municipal or non-municipal rural water use, are of great significance in ensuring water safety and reducing equipment wear and tear.
[0003] Currently, the most widely used type is the conventional external pressure single-layer pre-filter, where raw water enters from the outside of the filter screen and fills the outlet from the inside. This type of device is prone to clogging of the filter and downstream precision water purification equipment, leading to equipment damage. Furthermore, the sedimented impurities are difficult to remove from the middle of the device. In particular, in some areas where residents still use rural non-municipal tap water with poor water quality, ordinary pre-filters cannot filter water properly. Therefore, a pre-filter with a double-layer filter screen structure from the inside out has been developed. Utility Model Content
[0004] To overcome the above shortcomings, this utility model provides a pre-filter device with a double-layer filter internal pressure structure, which aims to improve the problems in the prior art that easily cause equipment blockage and that it is difficult for precipitated impurities to be discharged from the middle of the device.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A pre-filter device with a double-layer filter screen and internal pressure structure includes a lower filter body, a filter assembly installed inside the lower filter body, and a sewage discharge assembly installed at the bottom of the filter assembly.
[0007] The filter assembly includes a fine filter screen installed inside the lower filter body. A coarse filter screen is installed inside the fine filter screen, and the coarse filter screen is located inside the fine filter screen. The coarse filter screen does not contact the middle of the fine filter screen.
[0008] As a further description of the above technical solution:
[0009] The sewage discharge assembly includes a coarse filter screen with sewage discharge holes, which are located at the bottom of the coarse filter screen.
[0010] As a further description of the above technical solution:
[0011] A drain ball valve is installed at the bottom of the lower filter body, and the drain ball valve is located at the bottom of the drain hole of the coarse filter screen;
[0012] As a further description of the above technical solution:
[0013] An upper filter body is installed on top of the lower filter body, and both the coarse filter screen and the fine filter screen are located inside the upper filter body;
[0014] As a further description of the above technical solution:
[0015] The top of the upper filter body is fixedly connected to a water inlet, which is located at the top of the fine filter screen;
[0016] As a further description of the above technical solution:
[0017] The top of the upper filter body is fixedly connected to a water outlet, which is located at the top of the fine filter screen;
[0018] As a further description of the above technical solution:
[0019] The inlet and outlet are equipped with venting knobs, which are located on the top of the device.
[0020] This utility model has the following beneficial effects:
[0021] 1. In this utility model, raw water flows into the middle of the filter screen from the inlet, and passes through the coarse filter screen and the fine filter screen to filter impurities of different particle sizes from the inside to the outside. The filtered water flows out from the top outlet. Impurities that are not intercepted by the coarse filter screen settle to the bottom of the device, and impurities that do not pass through the fine filter screen also accumulate there.
[0022] 2. In this utility model, opening the drain ball valve at the bottom of the device allows impurities in the filter screen to be discharged by water pressure. The drain hole below the coarse filter screen can assist in discharging impurities in the fine filter screen. The knob at the top of the device is used to vent air during filtration. When draining, it is convenient to insert a brush or introduce negative pressure to accelerate the cleaning of the filter screen, ensuring thorough cleaning while reducing the number of times the entire equipment needs to be disassembled for cleaning. Attached Figure Description
[0023] Figure 1 This is a three-dimensional schematic diagram of a pre-filter device with a double-layer filter screen internal pressure structure proposed in this utility model.
[0024] Figure 2 This is a schematic diagram of the inlet structure of a pre-filter device with a double-layer filter screen and internal pressure structure proposed in this utility model.
[0025] Figure 3 A cross-sectional view of the coarse filter screen of a pre-filter device with a double-layer filter screen internal pressure structure proposed in this utility model;
[0026] Figure 4 This is a cross-sectional view of the coarse filter screen drain hole of a pre-filter device with a double-layer filter screen internal pressure structure proposed in this utility model.
[0027] Figure 5 This is a schematic diagram of the drain ball valve of a pre-filter device with a double-layer filter internal pressure structure proposed in this utility model.
[0028] Legend:
[0029] 1. Water inlet; 2. Air vent knob; 3. Water outlet; 4. Upper filter body; 5. Lower filter body; 6. Drain ball valve; 7. Fine filter screen; 8. Coarse filter screen; 9. Coarse filter screen drain hole. Detailed Implementation
[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0031] Reference Figure 1 , Figure 3 and Figure 4 The present invention provides an embodiment of a pre-filter device with a double-layer filter screen and internal pressure structure, including a lower filter body 5. The lower filter body 5 has a cylindrical structure and is integrally molded with high-strength and corrosion-resistant engineering plastic. It has good pressure resistance and chemical stability and can adapt to different water quality environments and water pressure conditions. A filter component is installed inside the lower filter body 5, and a sewage discharge component is installed at the bottom of the filter component.
[0032] The filter assembly includes a fine filter screen 7, whose shape is adapted to the internal contour of the lower filter body 5. It is woven from stainless steel and can effectively intercept fine impurities such as silt, rust, and suspended solids in the water. The fine filter screen 7 is installed inside the lower filter body 5. Inside the fine filter screen 7 is a coarse filter screen 8, which is also made of stainless steel but has a larger mesh size. It is mainly used to filter larger particles of impurities in the water, such as tree branches and gravel, while preventing impurities from impacting and damaging the fine filter screen. The coarse filter screen 8 is located inside the fine filter screen 7. The coarse filter screen 8 and the fine filter screen 7 do not contact each other in the middle, and there is a gap between them. This gap design not only avoids the two filter screens from rubbing against each other and damage, but also provides sufficient flow space for water, which helps to improve filtration efficiency and reduce water flow resistance.
[0033] Reference Figures 3-5The sewage discharge assembly includes a coarse filter screen discharge hole 9, which is located at the bottom of the coarse filter screen 8. The coarse filter screen discharge hole 9 ensures that impurities inside the fine filter screen 7 can be discharged smoothly, and also prevents the filtration effect inside the coarse filter screen 8 from being affected by excessively fast water flow. The edges of the coarse filter screen discharge hole 9 are rounded, which has a certain anti-clogging effect. A sewage discharge ball valve 6 is installed at the bottom of the lower filter body 5. The sewage discharge ball valve 6 includes a valve body to accommodate internal components, a ball to control the on / off state, a valve stem to transmit operating force, an actuator to drive the ball to rotate, a sealing ring to ensure media sealing, and a sewage discharge port to discharge impurities, etc. This is existing technology and will not be described in detail hereafter. The sewage discharge ball valve 6 has good rust prevention and sealing performance and is located at the bottom of the coarse filter screen discharge hole 9.
[0034] Reference Figure 1 and Figure 2 The upper filter body 4 is installed on the top of the lower filter body 5. A silicone sealing ring is set between the upper filter body 4 and the lower filter body 5 to ensure the overall sealing of the device and prevent water leakage. The coarse filter screen 8 and the fine filter screen 7 are both located inside the upper filter body 4. The upper filter body 4 provides a stable installation space for the filter components and also plays a certain role in protecting the filter screens from external factors. The top of the upper filter body 4 is fixedly connected to the water inlet 1. The diameter of the water inlet 1 matches that of common household water pipes and adopts a standard threaded interface design for easy connection with the water inlet pipe. The water inlet 1 is located on top of the fine filter screen 7. The top of the upper filter body 4 is fixedly connected to the water outlet 3. The water outlet 3 also adopts a standard threaded interface and is connected to the water outlet pipe. The water outlet 3 is located on top of the fine filter screen 7. The top of the water inlet 1 and the water outlet 3 are equipped with an exhaust knob 2, which adopts a rotary switch design. During filtration, residual air inside the device can be expelled by rotating the exhaust knob 2 to prevent air resistance from affecting the water flow rate. During the sewage discharge process, not only can the filter screen be manually cleaned by inserting the brush through the exhaust knob 2, but a negative pressure device can also be connected to introduce negative pressure gas. The negative pressure suction will remove stubborn impurities attached to the surface of the filter screen, greatly improving the cleaning effect of the filter screen and extending its service life. The exhaust knob 2 is located on the top of the device.
[0035] Working principle: First, raw water enters the middle of the filter screen through the inlet 1 and then enters the device from the inside to the outside. It flows out from the inside of the coarse filter screen 8 and the fine filter screen 7 respectively, filtering impurities of different particle sizes in the water. The filtered raw water fills the device and flows out through the outlet 3 at the top, achieving filtration of different particle sizes. Impurities that do not pass through the coarse filter screen 8 settle and accumulate at the bottom drain of the device, and impurities that do not pass through the fine filter screen settle and accumulate at the bottom drain of the device.
[0036] Secondly, filter impurities are discharged through the drain ball valve 6 at the bottom of the device. By opening the valve knob, the impurities accumulated inside the coarse filter screen 8 and the fine filter screen 7 are discharged by the water impact. The coarse filter screen 8 has drain holes 9 around its bottom, which facilitates the discharge of impurities stored inside the fine filter screen 7. A knob is located at the top of the device, which can be used to vent air during filtration. During the draining process, it is easy to insert a brush or introduce negative pressure air to clean the filter screen, which helps to remove dirt.
[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A pre-filter device with a double-layer filter screen and internal pressure structure, comprising a lower filter body (5), characterized in that: The lower filter body (5) is equipped with a filter assembly, and a sewage discharge assembly is installed at the bottom of the filter assembly; The filter assembly includes a fine filter (7) installed inside the lower filter body (5). A coarse filter (8) is installed inside the fine filter (7). The coarse filter (8) is located inside the fine filter (7) and does not contact the middle of the fine filter (7).
2. The pre-filter device with a double-layer filter screen internal pressure structure according to claim 1, characterized in that: The sewage discharge assembly includes a coarse filter screen discharge hole (9), which is located at the bottom of the coarse filter screen (8).
3. The pre-filter device with a double-layer filter internal pressure structure according to claim 2, characterized in that: A drain ball valve (6) is installed at the bottom of the lower filter body (5), and the drain ball valve (6) is located at the bottom of the drain hole (9) of the coarse filter screen.
4. The pre-filter device with a double-layer filter internal pressure structure according to claim 1, characterized in that: The upper filter body (4) is installed on the top of the lower filter body (5), and the coarse filter screen (8) and the fine filter screen (7) are both located inside the upper filter body (4).
5. A pre-filter device with a double-layer filter internal pressure structure according to claim 4, characterized in that: The top of the upper filter body (4) is fixedly connected to an inlet (1), which is located on top of the fine filter screen (7).
6. A pre-filter device with a double-layer filter screen internal pressure structure according to claim 5, characterized in that: The top of the upper filter body (4) is fixedly connected to a water outlet (3), which is located on top of the fine filter screen (7).
7. A pre-filter device with a double-layer filter internal pressure structure according to claim 6, characterized in that: The inlet (1) and outlet (3) are equipped with venting knobs (2), which are located on the top of the device.