A sealing structure of a T-shaped ductile cast iron pipe

Abstract

The utility model provides a kind of interface sealing structure of T type nodular cast iron pipe, including first T type nodular cast iron pipe, second T type nodular cast iron pipe and Y type main sealing ring, first T type nodular cast iron pipe right end is equipped with first flange interface, second T type nodular cast iron pipe left end is equipped with second flange interface, annular step groove is opened in the right end surface of first flange interface, the design solves the interface sealing structure of original T type nodular cast iron pipe actually only rely on two rubber rings to seal, its sealing effect is almost completely dependent on the compression rebound force of rubber ring initial, sealing performance needs to be improved, and cannot carry out real-time monitoring to its sealing state problem, the utility model uses combined elastic sealing structure, utilizes miniature spring compensation elastic sealing, redesigns detection inner cavity and resistance type diaphragm pressure sensor, for real-time monitoring cavity pressure, indirectly reflects the sealing state of Y type main sealing ring, provides the possibility for realizing predictive maintenance.

Description

Technical Field

[0001] This utility model relates to an interface sealing structure for a T-shaped ductile iron pipe, belonging to the field of pipeline sealing technology. Background Technology

[0002] T-type ductile iron pipes (i.e., slip-in T-type joint pipes) are widely used in pressure pipeline projects such as water supply and drainage due to their convenient installation and good sealing performance. Their existing known structure mainly consists of a socket, a spigot, and a T-shaped rubber sealing ring placed in a groove inside the socket. During installation, the spigot is pushed into the socket, and the rubber sealing ring undergoes elastic deformation under compression, filling the gap between the socket and the spigot, thus achieving a seal. However, the existing known T-type joint sealing structure suffers from limitations such as a single sealing pressure and poor adaptability to long-term aging.

[0003] For example, Chinese patent CN219734554U proposes an interface sealing structure for T-shaped ductile iron pipes. This structure significantly improves the sealing effect during installation and connection through triple sealing, allowing for rapid connection between two T-shaped ductile iron pipes. During the connection process, the protrusion enters the groove for a primary seal; the first and second rubber rings are pressed together for a secondary seal; and the contact between the first and second connecting parts is a tertiary seal. While this greatly enhances sealing performance, it relies almost entirely on the initial compression and rebound force of the rubber rings for the actual seal. Over time, the rubber material inevitably ages and relaxes, reducing its elastic recovery force and weakening the sealing pressure, leading to a risk of leakage. Furthermore, once the interface is installed, its sealing status cannot be detected, making it impossible to provide early warning of even minor leaks. Therefore, there is an urgent need for an interface sealing structure for T-shaped ductile iron pipes to address these problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide an interface sealing structure for T-type ductile iron pipes, thereby solving the problems mentioned in the background section. This invention adopts a combined elastic sealing structure, utilizes a micro spring to compensate for the elastic seal, and designs an internal cavity detection and resistive thin-film pressure sensor to monitor the cavity pressure in real time, indirectly reflecting the sealing status of the Y-type main sealing ring, thus providing the possibility for predictive maintenance.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a sealing structure for the interface of a T-shaped ductile iron pipe, comprising a first T-shaped ductile iron pipe, a second T-shaped ductile iron pipe, and a Y-shaped main sealing ring. The first T-shaped ductile iron pipe has a first flange interface at its right end, and the second T-shaped ductile iron pipe has a second flange interface at its left end. An annular stepped groove is formed on the right end face of the first flange interface, and an annular protrusion is integrally formed on the right end face of the first flange interface. An annular groove is formed on the left end face of the second flange interface. A detection cavity is formed at the contact point between the first flange interface and the second flange interface. A Y-shaped main sealing ring is installed in the annular stepped groove. Multiple micro springs are installed in the Y-shaped groove of the Y-shaped main sealing ring. A filling compensation ring is longitudinally connected to the right end of the multiple micro springs. The filling compensation ring is fixed to the right side of the inside of the Y-shaped groove of the Y-shaped main sealing ring by sealant. An annular stepped protrusion is fixed on the left end face of the second flange interface. A water-swellable auxiliary ring is filled in the detection cavity, and a resistive thin-film pressure sensor is installed inside the water-swellable auxiliary ring.

[0006] Furthermore, the first flange interface and the second flange interface are fixed together by multiple bolts.

[0007] Furthermore, the annular protrusion is engaged within the annular groove.

[0008] Furthermore, the annular step protrusion is engaged in the annular step groove, and the protrusion at the left end of the annular step protrusion is engaged in the Y-shaped groove of the Y-shaped main sealing ring and abuts against the filling compensation ring.

[0009] Furthermore, a corrosion-resistant rubber tube is installed at the lower end of the first T-shaped ductile iron pipe, and a connecting wire is installed inside the corrosion-resistant rubber tube.

[0010] Furthermore, the left side of the resistive thin-film pressure sensor passes through the first flange interface and is connected to a connecting wire, the left end of which is connected to an external terminal.

[0011] The beneficial effects of this utility model are as follows: The interface sealing structure of the T-type ductile iron pipe of this utility model has a reasonable structure due to the addition of annular protrusions, annular stepped protrusions, Y-type main sealing rings, miniature springs, filling compensation rings, water-expanding auxiliary rings, and resistive thin-film pressure sensors. It adopts a combined elastic sealing structure, utilizes miniature springs to compensate for elastic sealing, and further designs the detection cavity and resistive thin-film pressure sensors for real-time monitoring of cavity pressure, indirectly reflecting the sealing status of the Y-type main sealing ring. This provides the possibility of predictive maintenance and is highly practical. Attached Figure Description

[0012] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0013] Figure 1 This is a schematic diagram of the interface sealing structure of a T-shaped ductile iron pipe according to the present invention;

[0014] Figure 2 This is a cross-sectional schematic diagram of the interface sealing structure of a T-shaped ductile iron pipe according to the present invention.

[0015] Figure 3 This is a partially enlarged schematic diagram of the Y-type main sealing ring of the interface sealing structure of a T-type ductile iron pipe according to this utility model.

[0016] Figure 4 This is a schematic diagram of the Y-shaped main sealing ring disassembled in the interface sealing structure of a T-shaped ductile iron pipe according to this utility model.

[0017] In the diagram: 1-First T-type ductile iron pipe, 2-Second T-type ductile iron pipe, 3-First flange interface, 4-Second flange interface, 5-Annular protrusion, 6-Annular groove, 7-Annular stepped protrusion, 8-Annular stepped groove, 9-Y-type main sealing ring, 10-Miniature spring, 11-Filling compensation ring, 12-Detection inner cavity, 13-Water-swellable auxiliary ring, 14-Resistive diaphragm pressure sensor, 15-Corrosion-resistant rubber tube, 16-Connecting wire. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0019] Please see Figures 1-4This utility model provides a technical solution: a sealing structure for the interface of a T-shaped ductile iron pipe, including a first T-shaped ductile iron pipe 1, a second T-shaped ductile iron pipe 2, and a Y-shaped main sealing ring 9. The first T-shaped ductile iron pipe 1 has a first flange interface 3 at its right end, and the second T-shaped ductile iron pipe 2 has a second flange interface 4 at its left end. The right end face of the first flange interface 3 has an annular stepped groove 8 and an annular protrusion 5 integrally formed thereon. The left end face of the second flange interface 4 has an annular groove 6. A detection cavity 12 is formed at the contact point between the first flange interface 3 and the second flange interface 4. The Y-shaped main sealing ring 9 is installed inside the annular stepped groove 8. Multiple miniature springs 10 are installed inside the 9Y-shaped groove. The right end of the multiple miniature springs 10 is longitudinally connected to a filling compensation ring 11. The filling compensation ring 11 is fixed to the right side of the Y-shaped main sealing ring 9Y-shaped groove by sealant. An annular stepped protrusion 7 is fixed to the left end face of the second flange interface 4. The detection cavity 12 is filled with a water-swellable auxiliary ring 13. A resistive diaphragm pressure sensor 14 is installed inside the water-swellable auxiliary ring 13. This design solves the problem that the original T-type ductile iron pipe interface sealing structure actually relies on only two rubber rings for sealing. Its sealing effect almost entirely depends on the initial compression rebound force of the rubber rings, the sealing performance needs to be improved, and the sealing status cannot be monitored in real time.

[0020] As the first embodiment of this utility model: the first flange interface 3 and the second flange interface 4 are connected and fixed by multiple bolts, and the annular protrusion 5 is inserted into the annular groove 6. Through the precise cooperation between the added annular protrusion 5 and the annular groove, the first physical barrier and positioning structure of the interface are formed, which can effectively resist external radial force and realize the rapid centering and initial sealing of the interface.

[0021] The annular step protrusion 7 is inserted into the annular step groove 8, and the protrusion at the left end of the annular step protrusion 7 is inserted into the Y-shaped groove of the Y-shaped main sealing ring 9 and abuts against the filling compensation ring 11. Through the added multi-level nested structure, during the pressing process, the end of the annular step protrusion 7 directly acts on the filling compensation ring 11, thereby compressing the micro spring 10 and squeezing the lip of the Y-shaped main sealing ring 9, so that it produces the expected elastic deformation, thereby forming a tight main seal.

[0022] The lower end of the first T-shaped ductile iron pipe 1 is equipped with a corrosion-resistant rubber tube 15. The corrosion-resistant rubber tube 15 contains a connecting wire 16. The added corrosion-resistant rubber tube provides reliable physical and chemical protection for the connecting wire 16, ensuring that the signal transmission line can work stably for a long time in harsh pipeline environments.

[0023] The resistive thin-film pressure sensor 14 is connected to the connecting wire 16 through the first flange interface 3 on the left side. The left end of the connecting wire 16 is connected to an external terminal. Through the added signal connection structure, the resistive thin-film pressure sensor 14 embedded in the detection cavity 12 can transmit the sensed pressure signal to the external monitoring terminal in real time, providing a hardware foundation for realizing online monitoring of the sealing status.

[0024] As a second embodiment of this utility model: In actual installation and use, the Y-type main sealing ring 9 is first securely placed in the annular stepped groove 8 of the first flange interface 3. Then, the second flange interface 4 of the second T-type ductile iron pipe 2 is aligned with the first flange interface 3, ensuring that the annular stepped protrusion 7 on it is accurately aligned with the annular stepped groove 8.

[0025] The first flange interface 3 and the second flange interface 4 are connected by bolts. During the tightening process, the annular stepped protrusion 7 is gradually pressed into the annular stepped groove 8, and its left end protrusion is simultaneously embedded into the Y-shaped groove of the Y-shaped main sealing ring 9, continuously compressing and filling the compensation ring 11. The compensation ring 11 transmits pressure to multiple evenly distributed micro springs 10 behind it. After being compressed, the micro springs 10 generate a continuous and stable reverse force. This force, through the compensation ring 11, keeps the annular stepped protrusion 7 pressed against it, and forces the lip of the Y-shaped main sealing ring 9 to maintain a very high degree of fit with the contact surface, thus forming a strong and compensating main seal. The core function of the micro springs 10 is to compensate for the permanent deformation or stress relaxation of the Y-shaped main sealing ring 9 caused by long-term use and material aging, ensuring the durability of the sealing pressure. At the same time, the cooperation between the annular protrusion 5 and the annular groove 6 forms an arc-shaped sealing structure, forming an effective first line of defense. The detection cavity 12 formed by the contact surfaces of the two flange interfaces is filled with a water-swellable auxiliary ring 13. If a trace amount of fluid breaches the first two seals and enters the detection cavity 12, the water-expanding auxiliary ring 13 will rapidly absorb water and expand, automatically sealing the leakage path and forming an intelligent emergency sealing barrier. At this time, the resistive diaphragm pressure sensor 14 installed inside the detection cavity 12 monitors the pressure changes within the cavity in real time. Under normal sealing conditions, the pressure inside the detection cavity 12 is stable. If the main seal fails, fluid intrusion will cause the pressure inside the cavity to rise. This change is captured by the resistive diaphragm pressure sensor 14 and transmitted to the external monitoring terminal via the connecting wire 16, issuing a timely leak warning. This enables predictive maintenance and greatly improves the safety and reliability of pipeline operation.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0027] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sealing structure for the interface of a T-shaped ductile iron pipe, comprising a first T-shaped ductile iron pipe (1), a second T-shaped ductile iron pipe (2), and a Y-shaped main sealing ring (9), characterized in that: The first T-shaped ductile iron pipe (1) has a first flange interface (3) at its right end, and the second T-shaped ductile iron pipe (2) has a second flange interface (4) at its left end. The right end face of the first flange interface (3) has an annular stepped groove (8), and the right end face of the first flange interface (3) has an integrally formed annular protrusion (5). The left end face of the second flange interface (4) has an annular groove (6). The mating part of the first flange interface (3) and the second flange interface (4) has a detection cavity (12). A Y-shaped... The main sealing ring (9) has multiple miniature springs (10) installed in the Y-shaped groove of the Y-shaped main sealing ring (9). The right end of the multiple miniature springs (10) is longitudinally connected to a filling compensation ring (11). The filling compensation ring (11) is fixed to the right side of the Y-shaped groove of the Y-shaped main sealing ring (9) by sealant. The left end face of the second flange interface (4) is fixed with an annular step protrusion (7). The detection cavity (12) is filled with a water-swellable auxiliary ring (13). A resistive thin film pressure sensor (14) is installed inside the water-swellable auxiliary ring (13).

2. The interface sealing structure of a T-shaped ductile iron pipe according to claim 1, characterized in that: The first flange interface (3) and the second flange interface (4) are connected and fixed by multiple bolts.

3. The interface sealing structure of a T-type ductile iron pipe according to claim 1, characterized in that: The annular protrusion (5) is inserted into the annular groove (6).

4. The interface sealing structure of a T-shaped ductile iron pipe according to claim 1, characterized in that: The annular step protrusion (7) is inserted into the annular step groove (8), and the protrusion at the left end of the annular step protrusion (7) is inserted into the Y-shaped groove of the Y-shaped main sealing ring (9) and abuts against the filling compensation ring (11).

5. The interface sealing structure of a T-shaped ductile iron pipe according to claim 1, characterized in that: The first T-shaped ductile iron pipe (1) is equipped with a corrosion-resistant rubber pipe (15) at its lower end, and the corrosion-resistant rubber pipe (15) is provided with a connecting wire (16).

6. The interface sealing structure of a T-shaped ductile iron pipe according to claim 5, characterized in that: The resistive thin-film pressure sensor (14) is connected to the connecting wire (16) through the first flange interface (3) on the left side, and the left end of the connecting wire (16) is connected to an external terminal.

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