Anti-flow tee pipe fitting for PP-R pipe

Abstract

The utility model discloses a PP -R pipe anti -backflow tee pipe fitting belongs to building water supply pipe fitting technical field, its integrated setting has the filter assembly and the anti -backflow assembly of automatic opening and closing in the integrally formed tee pipe body and can pull from the pipe wall sealing groove, the filter assembly includes the pull -out frame of handle and filter screen, and the anti -backflow assembly includes the fixed sealing ring and spring return mechanism of movable ball cooperation, the utility model aims at solving the problem of long structure, complicated installation, space occupation, maintenance difficulty and high leakage risk caused by the separation of tee, filter, check valve in the prior art, has the beneficial effect that the function is highly integrated, the structure is compact, can purify water quality effectively, can prevent backflow pollution automatically, and can conveniently maintain the filter screen on line without disassembling the pipeline.

Description

Technical Field

[0001] This utility model relates to the field of building water supply pipe fittings technology, and in particular to a PP-R pipe anti-backflow tee fitting. Background Technology

[0002] Due to its advantages such as corrosion resistance, hygiene and non-toxicity, and reliable connection, pipes have become the mainstream choice for modern building water supply systems. In PP-R pipe systems, tee fittings are the basic components for realizing pipe branching and changing fluid flow direction, and are widely used.

[0003] However, in actual water supply networks, water flow inevitably carries solid impurities such as silt and rust. If these impurities directly enter the downstream, they can easily cause wear or blockage to the precision components of subsequent water-using equipment such as valves, water heaters, and water purifiers, affecting their normal operation and shortening their service life. To solve the above problems, the existing technology usually adopts a solution of independently installing a filter in the downstream pipeline of the tee fitting.

[0004] In addition, the stability and safety of the water supply system are also key considerations in pipeline design. When the main pipeline is shut down or the pressure drops suddenly, a pressure difference will form inside and outside the pipeline, which may cause water to backflow in the downstream branch pipe. This will not only pollute the water quality of the main pipeline, but also bring health and safety hazards. For this reason, technicians usually add an independent check valve in the pipeline to achieve unidirectional flow of fluid and prevent backflow.

[0005] Therefore, in an application scenario that requires both pipeline branching and impurity filtration while preventing backflow, existing technologies require the sequential installation of three independent components—the tee fitting, filter, and check valve—in series. This combination not only makes the entire pipeline system lengthy and space-consuming, but also significantly increases installation complexity and cost due to the presence of multiple connection points. More importantly, each connection point is a potential leak point, reducing the long-term reliability of the entire pipeline system. To address these issues, a PP-R anti-backflow tee fitting is proposed. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides a PP-R pipe anti-backflow tee fitting, which aims to improve the problems of existing water supply pipeline systems, such as single function, long and complex structure, inconvenient installation and difficult maintenance, due to the need to install tees, filters and check valves separately.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a PP-R pipe anti-backflow tee fitting, comprising: a main pipe and a secondary pipe connected to the main pipe; and a filter assembly disposed in the main pipe and an anti-backflow assembly disposed at the junction of the main pipe and the secondary pipe.

[0008] The filter assembly includes a pull-out frame that can be slidably installed in a sealing groove opened in the main pipe wall, and a filter screen fixed on the pull-out frame.

[0009] The anti-backflow assembly includes a fixed sealing ring and a retaining bead that can be movably abutted against or separated from the sealing ring.

[0010] Preferably, the outer periphery of the pull-out frame is provided with a sealing strip that mates with the sealing groove to enhance the sealing performance after installation.

[0011] Preferably, the pull-out frame is provided with rubber clips for securing it to the main pipe to prevent it from loosening under the impact of water flow.

[0012] Preferably, the pull-out frame is equipped with a handle for pull-out operation to facilitate maintenance of the filter assembly.

[0013] Preferably, the anti-backflow assembly further includes a connecting rod and a variable diameter spring. One end of the connecting rod is connected to the retaining bead, and the other end abuts against the variable diameter spring to achieve automatic reset of the retaining bead.

[0014] Preferably, as a further limitation of the above solution, the anti-backflow assembly also includes a stop that provides support for the variable diameter spring and the connecting rod.

[0015] Preferably, as a further limitation on the scheme including the connecting rod and the variable diameter spring, the anti-backflow assembly also includes a limiting block for restricting the movement range of the retaining ball to ensure the accuracy of its sealing action.

[0016] Preferably, as a specific implementation, the pull-out frame is equipped with a rubber locking block and a handle for pulling out, thus achieving a combination of stable fixation and convenient operation.

[0017] This utility model has the following beneficial effects:

[0018] 1. In this utility model, the filtration function is directly integrated into the inside of the tee fitting, which can effectively intercept solid impurities such as mud and rust in the water supply pipeline, purify the water quality from the source, avoid the blockage and damage caused by impurities to subsequent water-using equipment, and extend the service life of the entire pipeline system.

[0019] 2. In this utility model, the pipe fitting can realize one-way water flow function through the built-in anti-backflow component. When the water supply pressure is unstable or the water supply is suddenly stopped, the channel can be automatically and quickly closed to effectively prevent the downstream used water or potentially contaminated water from flowing back into the main network, avoid cross-contamination, and ensure the safety and hygiene of the water supply system. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of a PP-R pipe anti-backflow tee fitting proposed in this utility model;

[0021] Figure 2 This is a schematic diagram of the internal structure of the secondary pipe of a PP-R pipe anti-backflow tee fitting proposed in this utility model;

[0022] Figure 3 This is a structural schematic diagram of the anti-backflow component of a PP-R pipe anti-backflow tee fitting proposed in this utility model;

[0023] Figure 4 This is a schematic diagram of the internal structure of the anti-backflow tee fitting for PP-R pipes proposed in this utility model;

[0024] Figure 5 This is a schematic diagram of the filter assembly of a PP-R pipe anti-backflow tee fitting proposed in this utility model.

[0025] Legend:

[0026] 1. Main pipe; 2. Secondary pipe; 3. Anti-backflow assembly; 301. Sealing ring; 302. Clamping bead; 303. Limiting block; 304. Support seat; 305. Connecting rod; 306. Variable diameter spring; 4. Filter assembly; 401. Pull-out frame; 402. Filter screen; 403. Sealing strip; 404. Handle; 405. Rubber clamp; 406. Sealing groove. Detailed Implementation

[0027] 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.

[0028] Reference Figures 1-5 The present invention provides an embodiment of a PP-R pipe anti-backflow tee fitting, which includes a main pipe 1 and a secondary pipe 2. The main pipe 1 and the secondary pipe 2 are integrally formed into a tee pipe structure. The fitting also includes a filter assembly 4 disposed inside the main pipe 1 and an anti-backflow assembly 3 disposed at the junction of the main pipe 1 and the secondary pipe 2.

[0029] The main pipe 1 has a sealing groove 406 for installing the filter assembly 4. The filter assembly 4 includes a pull-out frame 401, which is slidably installed in the sealing groove 406. A filter screen 402 for filtering impurities in the water is fixedly installed in the inner frame of the pull-out frame 401. A sealing strip 403 for waterproof sealing is embedded in the outer peripheral wall of the pull-out frame 401. The sealing strip 403 is tightly fitted to the inner wall of the sealing groove 406. A rubber clip 405 for securely locking the pull-out frame 401 is also fixedly installed. The rubber clip 405 is detachably engaged with a corresponding clip on the main pipe 1. A handle 404 for easy pull-out operation is also fixedly connected to the outer end of the pull-out frame 401.

[0030] The anti-backflow assembly 3 is installed inside the main pipe 1. It includes a sealing ring 301 fixed on the inner wall of the pipe and a movable retaining bead 302. The retaining bead 302 can abut against the port of the sealing ring 301 to form a seal or separate to form a passage. One end of the retaining bead 302 is fixedly connected to one end of a connecting rod 305. The other end of the connecting rod 305 abuts against a variable diameter spring 306 for providing a reset spring force. A support seat 304 is also fixedly installed inside the pipe to provide stable support for the variable diameter spring 306 and the connecting rod 305. A limiting block 303 is fixedly installed on the moving path of the retaining bead 302 to limit its sealing position.

[0031] Water flows in from the main pipe 1 and first passes through the filter screen 402 to filter impurities. Then, the clean water flows into the retaining bead 302, pushing the connecting rod 305 to compress the variable diameter spring 306, causing the retaining bead 302 to separate from the sealing ring 301 to form a passage, allowing the water to flow smoothly. When the water flows backward, the reverse water pressure and the elastic force of the variable diameter spring 306 push the retaining bead 302 together, and under the positioning action of the limit block 303, it tightly abuts against the sealing ring 301 to close the passage and achieve the anti-backflow function. When maintenance is required, the rubber retaining block 405 can be removed from the slot by holding the handle 404, and the entire pull-out frame 401 can be pulled out along the sealing groove 406 to clean or replace the filter screen 402.

[0032] The main body of the pipe fitting in this embodiment can be manufactured using PP-R material through injection molding. The specific process is well-known in the field and will not be described in detail here.

[0033] Working principle: When water flows normally from the inlet of the main pipe 1, it first passes through the filter component 4, where the filter screen 402 intercepts impurities in the water. After preliminary purification, the water continues to impact the retaining bead 302 of the anti-backflow component 3. The kinetic energy and pressure of the water push the retaining bead 302 and move it together with the connecting rod 305 at its rear end, thereby compressing the variable diameter spring 306 that is pressed against the seat 304. This displacement creates a gap between the retaining bead 302 and the sealing ring 301, forming a passage, so that the water can flow smoothly to the outlet of the main pipe 1 and the secondary pipe 2.

[0034] When pressure fluctuations occur in the pipeline or upstream water outages cause water to attempt backflow, the reverse water flow pressure acts on the retaining bead 302. At the same time, the compressed variable diameter spring 306 releases its elastic energy. The two work together to push the connecting rod 305 and the retaining bead 302 to quickly return to the direction of the sealing ring 301 until the movement of the retaining bead 302 is blocked by the limiting block 303 and tightly abuts against the port of the sealing ring 301, thereby instantly sealing the water flow channel and effectively preventing water backflow.

[0035] When the filter 402 needs maintenance, the user only needs to hold the handle 404 and apply force outward to make the rubber block 405 elastically disengage from the slot of the main pipe 1. The entire pull-out frame 401 can then be smoothly pulled out along the sealing groove 406 for cleaning or replacement of the filter 402. After the operation is completed, push it back into place until the rubber block 405 is re-engaged and fixed.

Claims

1. A PP-R pipe anti-backflow tee fitting, comprising: The main pipe (1) and the secondary pipe (2) connected to the main pipe (1) are characterized in that they further include: The filter assembly (4) is installed in the main pipe (1). The main pipe (1) has a sealing groove (406) on its wall for the filter assembly (4) to be installed and removed. The filter assembly (4) includes a pull-out frame (401) slidably installed in the sealing groove (406) and a filter screen (402) installed on the pull-out frame (401). An anti-backflow assembly (3) is provided at the junction of the main pipe (1) and the secondary pipe (2). The anti-backflow assembly (3) includes a fixed sealing ring (301) and a retaining bead (302) that can move and abut or separate from the sealing ring (301).

2. The PP-R pipe anti-backflow tee fitting according to claim 1, characterized in that, The outer periphery of the pull-out frame (401) is provided with a sealing strip (403) that cooperates with the sealing groove (406).

3. The PP-R pipe anti-backflow tee fitting according to claim 1 or 2, characterized in that, The pull-out frame (401) is provided with a rubber clip (405) for fixing it to the main tube (1).

4. The PP-R pipe anti-backflow tee fitting according to claim 1, characterized in that, The pull-out frame (401) is connected to a handle (404) for pulling out the pull-out frame (401).

5. The PP-R pipe anti-backflow tee fitting according to claim 1, characterized in that, The anti-backflow assembly (3) also includes a connecting rod (305) and a variable diameter spring (306); one end of the connecting rod (305) is connected to the retaining bead (302), and the other end abuts against the variable diameter spring (306).

6. The PP-R pipe anti-backflow tee fitting according to claim 5, characterized in that, The anti-backflow assembly (3) also includes a stop (304) that provides support for the variable diameter spring (306) and the connecting rod (305).

7. The PP-R pipe anti-backflow tee fitting according to claim 5, characterized in that, The anti-backflow component (3) also includes a limiting block (303) for limiting the movement range of the ball (302).

8. The PP-R pipe anti-backflow tee fitting according to claim 3, characterized in that, The pull-out frame (401) is also connected to a handle (404) for pulling out the pull-out frame (401).

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