Large-displacement safety valve for railway tank car

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By designing a large-displacement safety valve for railway tank cars, the problems of insufficient displacement and discharge pressure of existing safety valves are solved, high displacement and high discharge pressure are achieved, the structure is simple, the production cost is reduced, and it is suitable for heavy-load and large-volume railway tank cars.

CN223344787UActive Publication Date: 2025-09-16XI AN RAILWAY TRANSPORTATION EQUIP

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Patent Information

Application Number: CN202422778517.5
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-11-14
Publication Date: 2025-09-16
Estimated Expiration: 2034-11-14

AI Technical Summary

Technical Problem

The displacement and discharge pressure of existing safety valves for railway tank cars are relatively low, which cannot meet the demand for heavy-load and large-volume railway tank cars. In addition, the production cost is high, which limits the development of heavy-load and large-volume railway tank cars.

Method used

A large-displacement safety valve for railway tank cars is designed, including a valve body, valve disc, spring and guide frame. By setting a central through hole, an annular air duct, annular stepped mounting groove and guide groove on the valve body, high displacement and discharge pressure are achieved. It is fixed to the top of the tank car through threaded holes and bolts, with a simple structure and easy installation.

Benefits of technology

It achieves high displacement and high discharge pressure, has a simple structure, reduces production and procurement costs, is suitable for heavy-load and large-volume railway tank cars, and breaks the development limitations.

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Abstract

The utility model particularly relates to a large-displacement safety valve for a railway tank car, and aims to solve the problems that the existing safety valve for the railway tank car is smaller in displacement, lower in setting pressure and discharge pressure, higher in production cost and limited in development of large-load and large-volume railway tank cars. The guide frame is fixed on the valve body through a connecting bolt; the O-shaped sealing ring is arranged in a sealing groove in the upper end surface of the valve body; the sealing surface of the valve body is tightly attached to the O-shaped sealing ring; the spring is sleeved on the valve body; during use, the safety valve is mounted on a mounting seat arranged at the top of a tank car through mounting holes formed in the valve body, the upper parts of the valve body, the guide frame and the valve clack are positioned outside the car body, and the rest parts are positioned inside the car body; when the pressure in the tank car is increased, the part in the tank car is extruded by the gas, so that the sealing surface of the valve clack leaves the O-shaped sealing ring, and the gas in the tank car is discharged to the outside.

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Description

Technical Field

[0001] The utility model relates to a safety valve, in particular to a large-displacement safety valve for railway tank cars. Background Art

[0002] In recent years, as the volume of railway tank cars has increased, the requirements for the displacement and discharge pressure of the safety valves used on them have also become increasingly stringent. The safety valves currently commonly used on railway tank cars typically include a valve body, a valve disc disposed within the valve body, and a spring installed within the valve body to reset the valve disc. Their main disadvantages are: first, the set pressure and discharge pressure are low, making it difficult to meet the needs of heavy-load, large-volume railway tank cars, which can easily lead to safety accidents and, to a certain extent, restrict the development of heavy-load, large-volume railway tank cars; second, most existing large-displacement safety valves have complex structures, high prices, long delivery cycles when demand is high, and difficult to control production costs, making it difficult to meet current production needs. Utility Model Content

[0003] The main purpose of the utility model is to solve the problem that the existing safety valves for railway tank cars have small displacement, low set pressure and discharge pressure, and high production cost, which restricts the development of heavy-load and large-volume railway tank cars, and to provide a large-displacement safety valve for railway tank cars.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A large-displacement safety valve for railway tank cars comprises a valve body, a valve disc provided on the valve body, and a spring for resetting the valve disc. The special features of the valve valve are:

[0006] The valve body is provided with a central through hole, an annular air duct is provided on the outside of the central through hole; an annular stepped mounting groove is provided on the outside of the annular air duct; a plurality of connecting bosses are uniformly provided along the circumference of the outside of the mounting groove, each of which is provided with a threaded hole; a plurality of mounting holes are also provided on the valve body outside the connecting bosses for fixing the valve body to a mounting seat provided on the top of the tank truck; a spring limiting groove is provided on the lower end surface of the valve body;

[0007] At least one water guide notch is symmetrically provided along the radial direction of the mounting groove, for connecting the annular air passage with the outside world;

[0008] The valve body is mounted with a guide frame, and a stepped guide groove is provided on the lower end surface of the guide frame, the shape of which matches the shape of the mounting groove provided on the valve body, for limiting the position of the guide frame; a plurality of mounting bosses are evenly arranged along the circumferential direction on the outer side surface of the guide frame, the number of which is the same as the number of connecting bosses provided on the valve body, and each of the mounting bosses is provided with a threaded hole; a plurality of connecting bolts pass through the mounting bosses and the threaded holes on the connecting bosses in sequence to fix the guide frame to the valve body;

[0009] A guide hole is provided at the center of the upper end surface of the guide frame, and a plurality of vent holes are uniformly provided on the outer side of the guide hole along the circumferential direction;

[0010] The sealing surface of the valve disc is sealed with the valve body. The size of the guide rod provided on the upper part of the valve disc is adapted to the size of the guide hole. The guide rod on the upper part of the valve disc passes through the guide hole, thereby limiting the valve disc and preventing it from shaking left and right. The lower outer wall of the pull rod provided on the lower part of the valve disc is provided with a thread.

[0011] The spring is sleeved on the pull rod, the top end of the spring is placed in the spring limiting groove, and the bottom end abuts against the upper end surface of the spring seat. The spring seat is sleeved on the pull rod through the spring seat mounting hole opened in the center thereof; the spring seat can move up and down along the pull rod, thereby adjusting the tension of the spring;

[0012] Two nuts with opposite tightening directions are also provided below the spring seat. Both nuts are threadedly connected to the pull rod to fix the spring seat in a desired position.

[0013] Furthermore, an annular sealing groove is provided on the upper end face of the valve body around the outside of the central through hole, and an O-ring is provided in the sealing groove; the annular ventilation channel is provided on the outside of the sealing groove; or, a sealing groove is provided on the sealing surface of the valve disc and the corresponding side of the valve body, the diameter of the sealing groove is larger than the diameter of the central through hole of the valve body, and an O-ring is provided in the sealing groove; the sealing surface of the valve disc and the valve body are sealed and connected by an O-ring.

[0014] Furthermore, a cotter pin located outside the nut and extending radially is provided at the end of the pull rod to prevent the nut from falling into the tank truck body when it is loosened.

[0015] Furthermore, the guide rod on the upper part of the valve disc adopts a split design, and the guide rod is screwed into the threaded hole opened at the upper end of the valve disc through the thread provided on the lower outer wall of the guide rod, and is locked and fixed using a locking nut.

[0016] Furthermore, the mounting boss is arranged at a lower portion of an outer side surface of the guide frame, or the mounting boss is arranged at an upper portion of an outer side surface of the guide frame.

[0017] Furthermore, an anti-loosening washer is provided between the nut and the spring seat.

[0018] Furthermore, the number of the mounting bosses, connecting bosses and connecting bolts is four.

[0019] Furthermore, the number of the mounting holes is eight.

[0020] Furthermore, there are two water guide notches, and the two water guide notches are arranged opposite to each other along the radial direction of the installation groove.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. The utility model provides a large-displacement safety valve for railway tank cars, which has a high displacement and discharge pressure. It can provide a safety accessory for large-load, large-volume railway tank cars and tank containers, breaking the limitations of the development of large-load, large-volume railway tank cars and tank containers.

[0023] 2. The utility model provides a large-displacement safety valve for railway tank cars, which has a simple structure and is easy to produce and install. It can greatly reduce the production and procurement costs of large-displacement safety valves for railway tank cars, thereby improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the three-dimensional structure of an embodiment of a large-displacement safety valve for a railway tank car according to the utility model;

[0025] Figure 2 This is a schematic cross-sectional view of an embodiment of a large-displacement safety valve for a railway tank car according to the present utility model;

[0026] Figure 3 This is a schematic diagram of the three-dimensional structure of a guide frame in an embodiment of a large-displacement safety valve for a railway tank car of the present utility model;

[0027] Figure 4 This is a schematic cross-sectional view of a guide frame in an embodiment of a large-displacement safety valve for a railway tank car according to the present invention;

[0028] Figure 5 This is a schematic diagram of the three-dimensional structure of a valve body in an embodiment of a large-displacement safety valve for railway tank cars of the present utility model;

[0029] Figure 6 This is a schematic cross-sectional view of a valve body in an embodiment of a large-displacement safety valve for railway tank cars according to the present invention;

[0030] Figure 7 This is a schematic diagram of the three-dimensional structure of a valve disc in an embodiment of a large-displacement safety valve for a railway tank car of the present utility model;

[0031] Figure 8 This is a schematic diagram of the three-dimensional structure of a spring seat in an embodiment of a large-displacement safety valve for a railway tank car of the present utility model;

[0032] Description of reference numerals:

[0033] 1-Guide frame; 11-Vent hole; 12-Guide hole; 13-Guide groove; 14-Mounting boss; 2-Connecting bolt; 3-Valve body; 31-Mounting groove; 32-Sealing groove; 33-Water guide notch; 34-Annular vent; 35-Mounting hole; 36-Connecting boss; 37-Spring limit groove; 4-Spring; 5-Valve disc; 51-Guide rod; 52-Pull rod; 6-Spring seat; 61-Spring seat mounting hole; 7-Nut; 8-Cotter pin; 9-O-ring; 10-Lock washer. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0035] A large displacement safety valve for railway tank cars, the overall structure of which is as follows Figure 1 、 Figure 2 As shown, a valve flap 5 is provided in a through hole opened in the center of the valve body 3, and a spring 4 is sleeved on the valve flap 5;

[0036] like Figure 5 、 Figure 6 As shown, the upper end surface of the valve body 3 is provided with an annular sealing groove 32, which is located on the outside of the central through hole of the valve body 3, and an O-ring 9 is provided in the sealing groove 32; an annular annular air duct 34 is provided on the outside of the annular air duct 34; an annular stepped mounting groove 31 is provided on the outside of the mounting groove 31; four connecting bosses 36 are provided on the outside of the mounting groove 31 along the circumferential direction, and each connecting boss 36 is provided with a threaded hole; a plurality of mounting holes 35 are also provided on the outside of the connecting boss 36 for fixing the valve body 3 on the mounting seat provided on the top of the tank truck, and each of the mounting holes 35 is a through hole; a spring limiting groove 37 is provided on the lower end surface of the valve body 3;

[0037] Two water guide notches 33 are symmetrically provided along the radial direction on the mounting groove 31, which are used to connect the annular vent 34 with the outside world, drain rainwater that falls into the annular vent 34, and prevent rainwater from entering the tanker;

[0038] The guide frame 1 is fixedly mounted on the valve body 3. Figure 3 、 Figure 4As shown, the lower end surface of the guide frame 1 is provided with a stepped guide groove 13, the shape of which matches the shape of the mounting groove 31 provided on the valve body 3; four mounting bosses 14 are evenly arranged along the circumference of the lower portion of the outer side surface of the guide frame 1, and each mounting boss 14 is provided with a threaded hole; during the installation process, four connecting bolts 2 are used to pass through the threaded holes on the mounting bosses 14 and the connecting bosses 36 in sequence to fix the guide frame 1 to the valve body 3;

[0039] A guide hole 12 is provided at the center of the upper end surface of the guide frame 1, and three vent holes 11 are evenly provided on the outer side of the guide hole 12 along the circumferential direction;

[0040] like Figure 2 、 Figure 7 As shown, the sealing surface of the valve disc 5 is in close contact with the O-ring 9 provided in the sealing groove 32. The size of the guide rod on the upper part of the valve disc 5 is adapted to the size of the guide hole 12. The upper part of the guide rod 51 passes through the guide hole 12. The lower outer wall of the pull rod 52 on the lower part of the valve disc 5 is threaded.

[0041] like Figure 2 As shown, the spring 4 is sleeved on the pull rod 52, the top end of the spring 4 is set in the spring limiting groove 37, and the bottom end is placed on the upper end surface of the spring seat 6, and the spring seat 6 is sleeved on the pull rod 52 through the spring seat mounting hole 61 opened in its center; two nuts 7 with opposite tightening directions are also provided under the spring seat 6, and the two nuts 7 are threadedly connected to the pull rod 52; during use, the operator can adjust the position of the spring seat 6 according to actual needs, thereby adjusting the tension of the spring 4, use the nut 7 to fix the spring seat 6 in the desired position, and set an anti-loosening washer 10 between the nut 7 and the spring seat 6 to adjust the technical parameters of the utility model; the end of the pull rod 52 is also provided with a cotter pin 8 extending radially. When the nut 7 threadedly connected to the pull rod is loose, the cotter pin 8 can be used to block the nut 7 to prevent it from falling into the interior of the tank truck body; the specific structure of the spring seat 6 is as shown in FIG. Figure 8 shown.

[0042] The present invention also has a variety of different preferred solutions. For example, the sealing groove 32 can also be provided on the sealing surface of the valve disc 5. In this case, the diameter of the sealing groove 32 should be larger than the diameter of the central through hole of the valve body 3. The O-ring 9 is disposed in the sealing groove 32 and is in close contact with the upper end surface of the valve body 3.

[0043] In another preferred embodiment, the valve disc 5 can be designed as a split type, that is, the guide rod 51 is screwed into the threaded hole provided on the upper end surface of the valve disc 5 through the thread provided on the outer wall of the lower portion thereof, and is further fixed using a locking nut;

[0044] In addition, the mounting boss 14 can also be set on the upper part of the outer side of the guide frame 1, and a stud with a fixing nut on the top is used to pass through the threaded holes opened on the mounting boss 14 and the connecting boss 36 in sequence to fix the guide frame 1 on the valve body 3.

[0045] The specific working process and principle of this utility model are as follows:

[0046] During assembly, the large-displacement safety valve for railway tank cars proposed in this utility model is mounted on a mounting base provided on the top of the tank car. The mounting base is provided with eight threaded holes evenly distributed along the circumference, corresponding to the mounting holes 35 on the valve body 3. The safety valve is then fixed to the mounting base using bolts. At this point, the valve body 3, the guide frame 1, and the guide rod 51 on the upper portion of the valve disc 5 are all located outside the tank car body, while the remaining portion is located inside the tank car body. Simultaneously, the spring seat is fixed to the appropriate position by rotating the nut 7 as needed, ensuring that the spring 4 maintains a specific tension. When the pressure inside the tank car increases, the portion of the safety valve located inside the tank car is squeezed upward. Because the valve disc 5 and its lower pull rod 52 are an integral structure, when the safety valve is squeezed, the sealing surface of the valve disc 5 separates from the O-ring 9. At this time, the gas inside the tank car leaks out through the gap between the valve disc 5 and the upper end surface of the valve body 3 into the annular vent 34, and then out through the three vent holes 11 provided on the upper end surface of the guide frame 1 to the outside, thereby balancing the pressure inside the tank car body.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. For ordinary professional and technical personnel in this field, the specific technical solutions recorded in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions protected by the present invention.

Claims

1. A large-displacement safety valve for a railway tank car, comprising a valve body (3), a valve flap (5) disposed on the valve body (3), and a spring (4) for returning the valve flap (5), characterized in that: The valve body (3) is provided with a central through hole, and an annular air passage (34) is provided on the outer side of the central through hole; an annular stepped mounting groove (31) is provided on the outer side of the annular air passage (34); a plurality of connecting bosses (36) are uniformly provided along the circumferential direction on the outer side of the mounting groove (31), and each connecting boss (36) is provided with a threaded hole; a plurality of mounting holes (35) are also provided on the valve body (3) on the outer side of the connecting boss (36); a spring limiting groove (37) is provided on the lower end surface of the valve body (3); At least one water guide notch (33) is evenly arranged in the radial direction on the installation groove (31) for connecting the annular air passage (34) with the outside world; The valve body (3) is fixedly mounted with a guide frame (1), and a stepped guide groove (13) is provided on the lower end surface of the guide frame (1), the shape of which matches the shape of the mounting groove (31) provided on the valve body (3); a plurality of mounting bosses (14) are evenly provided on the outer side surface of the guide frame (1) along the circumference, the number of which is the same as the number of the connecting bosses (36) provided on the valve body (3), and each of the mounting bosses (14) is provided with a threaded hole; a plurality of connecting bolts (2) pass through the threaded holes provided on the mounting bosses (14) and the connecting bosses (36) in sequence to fix the guide frame (1) on the valve body (3); A guide hole (12) is provided at the center of the upper end surface of the guide frame (1), and a plurality of vent holes (11) are uniformly provided on the outer side of the guide hole (12) along the circumferential direction; The sealing surface of the valve flap (5) is sealed with the valve body (3); the size of the guide rod (51) on the upper part of the valve flap (5) matches the size of the guide hole (12), and the upper part of the guide rod (51) passes through the guide hole (12); the lower outer wall of the pull rod (52) provided at the lower part of the valve flap (5) is threaded; The spring (4) is sleeved on the pull rod (52) at the lower part of the valve disc (5), the top end of the spring (4) is set in the spring limit groove (37), and the bottom end abuts against the upper end surface of the spring seat (6); the spring seat (6) is sleeved on the pull rod (52) through the spring seat mounting hole (61) opened in the center thereof; Two nuts (7) with opposite tightening directions are further provided below the spring seat (6). Both nuts (7) are threadedly connected to the pull rod (52) for fixing the spring seat (6) at a desired position.

2. A large-displacement safety valve for railway tank cars according to claim 1, characterized in that: An annular sealing groove (32) is provided on the upper end surface of the valve body (3) around the outer side of the central through hole, and an O-type sealing ring (9) is provided in the sealing groove (32); the annular air passage (34) is provided on the outer side of the sealing groove (32); or, a sealing groove (32) is provided on the sealing surface of the valve flap (5) on the side corresponding to the valve body (3), the diameter of the sealing groove (32) is larger than the diameter of the central through hole of the valve body (3), and an O-type sealing ring (9) is provided in the sealing groove (32); The sealing surface of the valve flap (5) and the valve body (3) are sealed via an O-type sealing ring (9).

3. The large-displacement safety valve for railway tank cars according to claim 1, characterized in that: The end of the pull rod (52) is also provided with a split pin (8) located outside the nut (7) and extending radially, for preventing the nut (7) from falling into the tank truck body when loosened.

4. The large-displacement safety valve for railway tank cars according to claim 1, characterized in that: The guide rod (51) on the upper part of the valve disc (5) adopts a split design. The guide rod (51) is screwed into the threaded hole provided on the upper end surface of the valve disc (5) through the thread provided on the lower outer wall thereof and is locked and fixed using a locking nut.

5. The large-displacement safety valve for railway tank cars according to claim 1, characterized in that: The mounting boss (14) is arranged at the lower portion of the outer side surface of the guide frame (1); or, the mounting boss (14) is arranged at the upper portion of the outer side surface of the guide frame (1).

6. A large-displacement safety valve for a railway tank car according to any one of claims 1 to 5, characterized in that: An anti-loosening washer (10) is also provided between the nut (7) and the spring seat (6).

7. A large-displacement safety valve for railway tank cars according to claim 6, characterized in that: The number of the mounting boss (14), the connecting boss (36) and the connecting bolt (2) is four.

8. The large-displacement safety valve for railway tank cars according to claim 7, characterized in that: The number of the mounting holes (35) is eight.

9. The large-displacement safety valve for railway tank cars according to claim 8, characterized in that: There are two water guide notches (33), and the two water guide notches (33) are arranged opposite to each other along the radial direction of the installation groove (31).