Dry type connector for tank car and tank container

Abstract

The utility model discloses a dry-type joint for a tank car and a tank container, which comprises a valve body, a valve clack and a star-shaped guide rod, the star-shaped guide rod is fixed at the upper part in the valve body, the top of the valve clack is embedded in the star-shaped guide rod, a pressure spring is sleeved on the valve clack, and the bottom revolution surface of the valve clack and the inner revolution surface of the outlet end of the valve body are circular truncated cone revolution surfaces. The outer rotation surface of the bottom of the valve clack is matched with the inner rotation surface of the outlet end of the valve body, an O-shaped ring is arranged between the rotation surface of the bottom of the valve clack and the inner rotation surface of the outlet end of the valve body, a mounting groove for embedding the O-shaped ring is formed in the rotation surface of the bottom of the valve clack, the cross section of the mounting groove is in a circular arc shape, the diameter d of the circular arc is equal to the line diameter of the O-shaped ring, and the diameter D of the O-shaped ring is equal to the line diameter of the O-shaped ring. The diameter of the axial section of the mounting groove is D0, D is larger than D0, D-D0 is equal to D, and the value range of D is 1-4 mm; after the O-shaped ring is embedded into the installation groove, the O-shaped ring protrudes out of the rotation face of the bottom of the valve clack, the protruding amount of the O-shaped ring in the normal direction is f, and f ranges from 0.5 mm to 0.7 mm.

Description

Technical Field

[0001] The utility model belongs to accessories for transportation containers, and particularly relates to a dry joint for external connection during the loading and unloading of tank trucks and tank containers. Background Art

[0002] With the increasing improvement of technology, continuous economic development, and the booming development of all walks of life, the transportation industry is becoming increasingly prosperous. At the same time, the requirements for transportation containers are also gradually increasing. For different transportation media, the configurations of tank trucks and tank containers have been adjusted differently. Generally, the trend is to adjust towards convenient loading and unloading, operation, and safety. Among them, the part that can reflect convenient loading and unloading and operation is mainly the part for external connection during the loading and unloading of tank trucks and tank containers. This part is a joint with a connecting function. According to different connection forms, it usually includes: quick-connect joints, external thread joints, flange connections, and other joint structures. Basically, joints of such connection methods have the same defect: when the connection part is impacted by external force and the connection part becomes disengaged, the medium will leak severely without sealing, causing environmental pollution and even endangering personal safety.

[0003] Currently, dry joints on the market achieve a tight connection by installing an O-ring on the valve flap. However, the inner diameter of the O-ring is smaller than the diameter of the groove on the valve flap. After installing the O-ring in the groove, the O-ring will always be in a tight state and always be under tension. After long-term use, due to severe deformation of the O-ring, there is a risk of loose sealing, or even breakage and falling off, ultimately resulting in accidents such as environmental pollution and even endangering personal safety. Summary of the Utility Model

[0004] In view of the above-mentioned prior art, in order to effectively prevent accidents such as environmental pollution and endangering personal safety, the utility model provides a dry joint for tank trucks and tank containers, which improves the sealing structure to prevent medium leakage, environmental pollution, and even accidents endangering personal safety caused by loose sealing or breakage and leakage of the rubber ring.

[0005] To solve the above technical problems, a dry joint for a tank truck and a tank container proposed by the present utility model includes a valve body, a valve flap and a star-shaped guide rod. The star-shaped guide rod is fixed to the upper part inside the valve body. The top of the valve flap is embedded in the star-shaped guide rod. A pressure spring is sleeved on the valve flap. The bottom rotating surface of the valve flap and the inner rotating surface of the outlet end of the valve body are both conical rotating surfaces. The outer rotating surface at the bottom of the valve flap cooperates with the inner rotating surface at the outlet end of the valve body. An O-ring is provided between the bottom rotating surface of the valve flap and the inner rotating surface of the outlet end of the valve body. An installation groove for embedding the O-ring is provided on the bottom rotating surface of the valve flap. The cross-section of the installation groove is arc-shaped. The diameter d of the arc is equal to the wire diameter of the O-ring. The diameter of the O-ring is D. The axial section diameter of the installation groove is D0, and D > D0, △D - D0 = △D. The value range of △D is 1 - 4 mm. After the O-ring is embedded into the installation groove, the O-ring protrudes from the bottom rotating surface of the valve flap, and the protrusion amount in the normal direction is f, f = 0.5 - 0.7 mm.

[0006] Further, in the dry joint of the present utility model,

[0007] According to the specification dimensions of the dry joint, the value range of △D is as follows: when the specification of the dry joint is DN25 - DN50, △D = 1 - 2.5 mm; when the specification of the dry joint is greater than DN50, △D = 2.5 - 4 mm.

[0008] The top of the valve body is a flange integrated with the valve body, and a water line structure is provided on the flange end face.

[0009] The upper part of the valve flap is a rod-shaped structure, and the lower part of the valve flap is a conical disk. An axial shoulder step surface is provided on the outer rotating surface of the star-shaped guide rod. The pressure spring is sleeved on the rod-shaped structure at the upper part of the valve flap. One end of the pressure spring abuts against the axial shoulder step surface of the star-shaped guide rod, and the other end abuts against the conical disk surface of the valve flap.

[0010] Compared with the prior art, the beneficial effects of the present utility model are:

[0011] In the present utility model, the cross-section of the installation groove designed on the valve flap for installing the O-ring is in conformity with the shape and size of the cross-section of the O-ring. Moreover, the diameter of the O-ring (the ring opening) is larger than the axial section diameter (i.e., the grooved diameter) of the installation groove. During the installation process, the O-ring is evenly clamped in the installation groove. Since the diameter of the O-ring's ring opening is larger than the grooved diameter of the valve flap, the O-ring and the groove on the valve flap adopt an extrusion assembly. After installation, the O-ring is in a contracted state in the entire circumferential direction, avoiding the O-ring being in a stretched state for a long time, without tensile force, thus prolonging the service life of the O-ring. At the same time, since the depth of the groove on the valve flap is controlled such that the O-ring protrudes from the bottom rotating surface of the valve flap, and the protrusion amount in the normal direction is f, where f = 0.5 - 0.7 mm, the sealing effect is optimized, effectively avoiding leakage of the dry joint caused by fatigue shedding of the O-ring. The present utility model improves the service life and stability of the product, and has effective and extensive practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic structural diagram of the dry joint of the present utility model;

[0013] Figure 2 is Figure 1 a partial cross-sectional view of the valve flap shown in

[0014] In the figure:

[0015] 1 - valve body, 2 - star-shaped guide rod, 3 - pressure spring, 4 - valve flap, 5 - O-ring, 6 - installation groove, 7 - water line structure DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following further describes the present utility model in conjunction with the accompanying drawings and specific embodiments, but the following embodiments are by no means any limitation to the present utility model.

[0017] As Figure 1 and Figure 2As shown in the figure, a dry joint for a tanker and a tank container proposed by the present utility model includes a valve body 1, a valve flap 4 and a star-shaped guide rod 2. The top of the valve body 1 is a flange integrally structured with the valve body, and a water line structure 7 is provided on the end face of the flange. The upper part of the valve flap 4 is a rod-shaped structure, and the lower part of the valve flap 4 is a frustum disc. The star-shaped guide rod 2 is fixed to the upper part inside the valve body 1, and a shoulder step surface is provided on the outer rotating surface of the star-shaped guide rod 2; the top of the valve flap 4 is embedded in the star-shaped guide rod 2, and a pressure spring 3 is sleeved on the valve flap 4. The pressure spring 3 is sleeved on the rod-shaped structure at the upper part of the valve flap 4, with one end abutted against the shoulder step surface of the star-shaped guide rod 2 and the other end abutted against the frustum disc surface of the valve flap 4. The bottom rotating surface of the valve flap 4 and the inner rotating surface of the outlet end of the valve body 1 are both frustum rotating surfaces. The outer rotating surface at the bottom of the valve flap 4 is matched with the inner rotating surface of the outlet end of the valve body 1. An O-ring 5 is provided between the bottom rotating surface of the valve flap 4 and the inner rotating surface of the outlet end of the valve body 1. An installation groove 6 for embedding the O-ring 5 is provided on the bottom rotating surface of the valve flap 4, as Figure 2 shown, the cross-section of the installation groove 6 is arc-shaped, the diameter d of the arc is equal to the wire diameter of the O-ring 5, the diameter of the O-ring 5 is D, the axial section diameter of the installation groove 6 is D0, and D > D0, △D - D0 = △D, and the value range of △D is 1 - 4 mm; as the specification of the dry joint increases, the difference △D between the O-ring diameter size and the grooved axial section diameter of the installation groove 6 will also increase. According to the specification size of the dry joint, the value range of △D is: when the specification of the dry joint is DN25 - DN50, △D = 1 - 2.5 mm; when the specification of the dry joint is greater than DN50, △D = 2.5 - 4 mm, and at this time, the sealing effect of the dry joint is the best.

[0018] Meanwhile, to ensure the best sealing effect, after the O-ring 5 is embedded in the installation groove 6 and the valve flap 4 and the O-ring 5 are assembled, the O-ring 5 protrudes from the bottom rotating surface of the valve flap 4, and the protrusion amount in the normal direction is f, and f = 0.5 - 0.7 mm.

[0019] In the present utility model, some geometric dimensions of the valve flap 4 are as Figure 2 shown, where D0 is the grooved axial section diameter of the installation groove 6, D1 is the small head diameter of the lower frustum disc of the valve flap 4, D2 is the large head diameter of the lower frustum disc of the valve flap 4, H is the height of the frustum disc, h is the height from the grooved cross-section of the installation groove 6 to the end face of the small head of the frustum disc, d is the arc diameter of the installation groove 6, and f is the protrusion amount in the normal direction of the O-ring 5 protruding from the frustum disc rotating surface after the O-ring 5 is installed in the installation groove 6. According to the specification of the dry joint, relevant design dimensions can be determined by professionals in the industry.

[0020] In the present utility model, the star-shaped guide rod 2 can have a clamping feature during rotation and can guide the valve flap 4. Without external extrusion, the pressure spring 3 can push the valve flap 4 to reset by relying on the restoring force of the pressure spring 3 to achieve natural sealing.

[0021] In the present utility model, the valve body 4 is integrally formed by casting stainless steel. Its inlet end is a flange surface and has a waterline structure 7 for sealing. The outlet end has a grooved snap ring for facilitating locking with the female head or dust cover. The sealing method adopts O-ring extrusion sealing. The valve flap 4 reciprocates in the inner cavity of the valve body under the action of the star-shaped guide rod 2 and the pressure spring 3 to achieve opening and closing. At the same time, it is ensured that the dry joint automatically closes without external extrusion.

[0022] The dry joint of the present utility model has a self-sealing function and is used in connection with the female head. When the joint is quickly connected to the female head, the external female head is rotated. The female head catches the snap ring outside the joint to form an external seal. At the same time, the ejecting part inside the female head pushes open the valve flap inside the joint, and the valve flap 4 of the dry joint is pushed open, and the pipeline forms a passage to achieve discharging. After discharging is completed, when the female head is removed by rotation, the valve flap 4 of the dry joint will rebound under the action of the pressure spring 3 and the internal pressure of the tank body to seal with the valve body to prevent medium leakage. Under the action of the spring, the valve flap completes sealing to achieve an effective quick-connection sealing method.

[0023] In summary, the dry joint of the present utility model is a joint that can achieve quick installation and an automatic sealing system, is applicable to tank container transportation, and minimizes property losses. It provides a design idea for the development of joints with similar requirements in the future.

[0024] Although the present utility model has been described above in conjunction with the accompanying drawings, the present utility model is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present utility model, those of ordinary skill in the art can also make many improvements and changes without departing from the purpose of the present utility model, and these all fall within the protection scope of the present utility model.

Claims

1. A dry joint for a tank truck or tank container, comprising a valve body (1), a valve flap (4) and a star-shaped guide rod (2), wherein the star-shaped guide rod (2) is fixed to the upper part of the valve body (1), the top of the valve flap (4) is embedded in the star-shaped guide rod (2), a pressure spring (3) is mounted on the valve flap (4), the bottom rotating surface of the valve flap (4) and the inner rotating surface of the outlet end of the valve body (1) are both truncated cone rotating surfaces, the bottom outer rotating surface of the valve flap (4) cooperates with the inner rotating surface of the outlet end of the valve body (1), an O-ring (5) is arranged between the bottom rotating surface of the valve flap (4) and the inner rotating surface of the outlet end of the valve body (1), and a mounting groove (6) for embedding the O-ring (5) is arranged on the bottom rotating surface of the valve flap (4), characterized in that: The cross section of the installation groove (6) is in the shape of an arc, the diameter d of the arc is equal to the wire diameter of the O-ring (5), the diameter of the O-ring (5) is D, the axial cross-section diameter of the installation groove (6) is D0, D>D0, ΔD-D0=ΔD, and the value range of ΔD is 1 to 4 mm; After the O-ring (5) is embedded in the installation groove (6), the O-ring (5) protrudes from the bottom rotation surface of the valve disc (4) and the protrusion amount in the normal direction is f, where f=0.5-0.7 mm.

2. The dry type joint for tank trucks and tank containers according to claim 1, characterized in that: According to the specifications of the dry joint, the value range of △D is: when the specifications of the dry joint are DN25~DN50, △D=1~2.5mm; when the specifications of the dry joint are greater than DN50, △D=2.5~4mm.

3. The dry type joint for tank trucks and tank containers according to claim 1, characterized in that: The top of the valve body (1) is a flange that is an integral structure with the valve body, and the end surface of the flange is provided with a waterline structure (7).

4. The dry type joint for tank trucks and tank containers according to claim 1, characterized in that: The upper part of the valve flap (4) is a rod-shaped structure, the lower part of the valve flap (4) is a truncated cone disk, and the outer rotating surface of the star-shaped guide rod (2) is provided with a shoulder step surface; the pressure spring (3) is sleeved on the rod-shaped structure at the upper part of the valve flap (4), one end of the pressure spring is pressed against the shoulder step surface of the star-shaped guide rod (2), and the other end is pressed against the truncated cone disk surface of the valve flap (4).

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