RU2281871C2 - Railway tank car shutoff-drain device - Google Patents

Abstract

FIELD: transport engineering.

SUBSTANCE: invention relates to devices for discharging liquid and viscous products from railway tank cars. Proposed shutoff-drain device has drain neck 9 with independently controlled main and backup rotary disk gates and end plug. In open position of main and backup disk gates, their working disks are arranged at different sides from axis of tank car drain neck. Barrel of tank is connected by flange 6 to flanged housing 7, 8 of main and backup rotary disk gates to form tank drain neck 9 by connected housings. Beads 12 and 13 are made on connecting surfaces of flange 6, and mating grooves 14 and 15 are made in housing 7 and 8 for mating with beads of flange through sealing gaskets 16 and 17. Shielding half-rings-lips 29 and 30 are secured in housing 7 and 8. Ring collector 35 of liquid product with directed draining device is secured on plug.

EFFECT: improved operation reliability and safety.

5 cl, 6 dwg

Description

The invention relates to transport machinery, in particular to devices for unloading liquid and viscous products from railway tanks.

In accordance with domestic and international rules for the transport of dangerous goods by rail, the conditions for storage and transportation of tanks are strictly regulated by the requirements for reliability and explosion safety. These requirements are ensured, inter alia, by the tightness and reliability of the shutoff valves used to drain the transported medium from the tanks.

Known locking and draining devices for railway tanks contain valves with poppet locking bodies (for example, patent RU 2161573, IPC ⁷ B 61 D 5/00, publication date 10.01.2001), cylindrical locking bodies (for example, patent RU 2179680, IPC ⁷ F 16 K 27/07, publication date - 02/20/2002), rotary disk locking bodies (e.g. patent EP 0455289, IPC 63 B 25/08, F 16 K 13/00, publication date - 11/06/1991), ball locking bodies (application US 2003121554, IPC F 16 K 11/085, publication date - 07/03/2003).

However, the presence of one shutter in the shut-off and drain device does not provide a sufficient degree of tightness of the tank during storage and transportation of combustible and environmentally hazardous liquid cargo.

It is recommended that the existing rules for the manufacture of tanks for explosive cargoes equip the tank with shut-off and drain devices, which are a system of three sequentially installed valves: the main internal valve controlled from above; a backup shutter controlled from below and an additional shutter, for example, in the form of an end cap.

Known locking and drain devices for railway tanks, containing two, three overlapping shutters, thereby providing greater tightness and reliability of the device.

Known locking and sleeping device for a tank, protected by patent RU 2154217, IPC ⁷ F 16 K 27/07, publication date - 08/10/2000. An analog device is designed for tanks with aggressive liquids and gases. It contains three sequentially installed shutters with independent from each other actuators: an internal shutter, an external shutter and an additional shutter. The internal shutter contains a locking body in the form of two plates, the main and preliminary. The preliminary plate is connected to a spring-loaded stem mounted in the sleeve. The rod is driven by a handle through the spindle and cam. The external shutter is made in the form of a ball valve. An additional shutter is made in the form of an end cap. Internal and external valves are installed in a monolithic housing.

By forced movement of the spring-loaded rod, the preliminary plate of the internal shutter is torn off the saddle and open the passage to the medium drained from the tank. After filling the drain pipe with medium, the main valve plate rises. The time required to fill the drain pipe is large enough and the response of the analog drain device occurs with a delay. In this case, the main shutter plate is in the flow path, as a result of which ripple may occur. The completeness of the discharge of the contents of the tank by the design of the analog device is not provided. Placing the main shutter drive below the tank is contrary to regulatory requirements, including international standards.

The prototype of the inventive locking and draining device is a locking and draining device for a railway tank, protected by patent RU 2182091, IPC ⁷ B 61 D 5/00, publication date - 05/10/2002.

The prototype device is located in the bottom of the railway tank and contains sequentially located in the casing and independently controlled valves, the main of which is installed in the internal volume of the tank boiler in the area of the exit window, made in the form of a ball valve with three nozzles and kinematically connected with a control rotary rod, longitudinally oriented to the filler neck of the tank. The control rod is equipped with a folding rotary mechanism in the form of a control winch mounted on an arm in the neck of the tank loading hatch. The gate is connected to the rod by means of a rotary sleeve. At the end of the outer part of the housing of the locking and draining device, a plug with a hinged bracket and a clamping screw is installed. Above the end cap in the housing of the shut-off-drain device, a backup shutter is located in the form of a rotary damper interacting with a non-metallic sealing seat.

The use of a ball valve in a shut-off and prototype device makes the device heavier, complicates its construction and makes it difficult to maintain due to the inaccessibility of the sealing surfaces of the ball valve for inspection without disassembling the device. Regulation of the sealing force in the shutoff of the ball valve of the device. The regulation of the sealing force in the shutter of the ball valve is also impossible without draining the product from the tank.

The claimed invention solves the technical problem of increasing the operational reliability and safety of a locking and draining device, mainly for railway tanks, reducing its weight and facilitating maintenance.

The claimed technical result is achieved in a locking and drain device, mainly for a railway tank, including a drain neck with sequentially installed, independently controlled main and duplicate butterfly valves and end caps. The main and duplicate butterfly valves are made disk, in the open position of the main and duplicate butterfly valves their working disks are located on different sides from the axis of the drain neck of the tank. The boiler of the tank is equipped with a flange for connecting to it from inside and outside the flange bodies of the main and backup rotary butterfly valves and forming from the connected bodies the drain neck of the tank. Flanges are made on the inner and outer connecting surfaces of the flange, and reciprocal recesses are made in the connected cases of the main and backup rotary butterfly valves for interfacing through the gaskets with the flange collars. In the main and backup rotary butterfly valve housings, shielding half-rings visors are fixed. An annular collector of liquid product with a device for its directed discharge is fixed on the plug.

The invention is illustrated in the drawing:

figure 1 - General view of the tank with a locking and drain device;

figure 2 - view And the locking-drain device, the General layout;

figure 3 is a cross section BB of the tank; main rotary butterfly valve - in the closed position;

figure 4 - section bb of the tank; main rotary butterfly valve - in the open position;

5 is a cross-section GG locking and draining device in the closed position;

6 is a cross section DD ball retainer hinged stub on the body of the backup rotary butterfly valve.

The inventive locking and draining device, mainly for a railway tank 1, is located in the bottom of its boiler 2 and contains sequentially installed and independently controlled main 3, duplicating 4 butterfly valves and end cap 5.

The boiler 2 of the tank 1 is equipped with a flange 6 for connecting inside and outside the flange bodies 7 and 8, respectively, of the main 3 and duplicating 4 butterfly valves and the formation of the drain neck 9 of the boiler 2. On the inner 10 and outer 11 connecting surfaces of the flange 6 the collars 12 and 13 are made, and in the cases 7 and 8, respectively, the recesses 14 and 15 for interfacing through the gaskets 16 and 17 with the collars 12 and 13 of the flange 6.

The main rotary butterfly valve 3 comprises a seat 18 in the housing 7 and a working disk 21 mounted on the rotary shaft 19 and the rotary axis 20. The seal in the valve 3 is provided by an elastic ring 22.

The duplicate rotary butterfly valve 4 comprises a seat 23 in the housing 8 and a working disk 26 located on the rotary shaft 24 and the rotary axis 25. The seal in the valve 4 is provided by an elastic ring 27. The rotary shaft 24 is connected to the drive handle 28.

In the open position of the main 3 and the backup 4 of the butterfly valve, their working disks 21 and 26 are located on opposite sides of the axis of the drain neck 9 of the boiler 2. In the cases 7 and 8 of the main and the backup butterfly valve of 3 and 4, shielding half rings visors 29 and thirty.

In the connector of the drain neck 9 of the tank and plug 5, a main 31 and a backup seal 32 are installed, for example in the form of an annular sealing gasket and an elastic sealing ring. The sealing force in the connector is created by a hinged bracket 33 and a clamping screw 34. An annular collector 35 of the liquid product with a device 36 for directed discharge is secured to the plug 5. On the housing 8 of the duplicate rotary disk shutter 4, a ball lock 37 of the hinged bracket 33 is provided in the open position of the plug 5.

The site of manual remote control of the shaft 19 of the main rotary butterfly valve 3 is mounted in the filler neck 38 of the boiler 2. It includes a retractable rotary column 40 with a folding manual drive 41 connected to the shaft 19 through the rotary rod 42, the articulated sleeve 43 and the bevel gear 44. manual remote control of the shaft 19 is also equipped with a locking device 39 of the position of the shaft. The filler neck 38 is provided with a lid 45.

The inventive locking and drain device operates as follows.

When the shut-off and drain device is closed, the operational reliability and safety of the tank 1 are ensured both by the tightness of the butterfly valves 3 and 4, and by their reliable connection to the flange 6 of the boiler 2. Leakage from the boiler 2 into the environment is possible only through at least a double seal : either through the main rotary butterfly valve 3 with the sealing ring 22 and the sealing gasket 17, or through two sealing gaskets 16 and 17. The connector "drain neck 9 - plug 5" is sealed in the closed position comb the initiation of the seal 31 and the seal ring 32. When loosening the tightness of the seal 31, the tightness of the connector provides the seal ring 32.

The presence on the plug 5 of the annular collector 35 for directed discharge of the liquid product when opening the plug 5 increases the safety and ease of operation of the shut-off and drain device.

To open the inventive device and drain the contents of the tank 1, the lid 45 of the filler neck 38 is lifted and, by rotating the hand drive 41 in a horizontal plane, rotate the rotary rod 42, which through the articulated clutch 43 and bevel gear 44 transmits rotation to the shaft 19 of the working disk 21 of the main rotary disk shutter 3. The shutter is opened and held open by a locking device.

The clamping screw 34 is unscrewed, the hinged bracket 33 together with the end cap 5 and the clamping screw 34 are turned and pushed aside to the stop, locking them in the open position on the housing 8 with a ball lock 37. Then, the drain hose (not shown) is connected to the lower end locking and drain device.

The rotation of the drive handle 28 drives the shaft 24 of the working disk 26 of the backup rotary butterfly valve 4.

The implementation of the main and backup butterfly valves 3 and 4 disk allows you to increase operational reliability and safety, reduce the weight of the shut-off and drain device. The location of the working discs in the open position on different sides of the axis of the drain neck of the boiler simplifies the inspection of the sealing surfaces of the shutters and facilitates the maintenance of the shut-off and drain device.

The presence in the housings 7 and 8 of the main and backup rotary butterfly valves 3 and 4 of the shielding half-rings visors 29 and 30 allows you to protect the working disks 21 and 26 from the abrasive effects of the flow of the product drained from the boiler 2.

Closing the shut-off and drain device is carried out in the reverse sequence, after unloading the shaft position lock 19.

Claims (5)

1. Shut-off and drain device mainly for railway tanks, including a drain neck with sequentially independently controlled main and duplicate butterfly valves and end plugs installed in it, characterized in that the main and duplicate butterfly valves are made of disk, and in the open position of the main and duplicate butterfly valves shutters their working disks are located on different sides from the axis of the drain neck of the tank. 2. Shut-off and drain device according to claim 1, characterized in that the tank boiler is equipped with a flange for attaching to it from inside and outside the flange bodies of the main and backup rotary butterfly valves and forming from the connected bodies the drain neck of the tank. 3. Shut-off and drain device according to claim 2, characterized in that collars are made on the inner and outer connecting surfaces of the flange, and reciprocal recesses are made in the connected cases of the main and backup rotary butterfly valves for interfacing through the gaskets with the collars of the flange. 4. Shut-off and drain device according to claim 2, characterized in that shielding half-rings visors are fixed in the main and duplicate rotary butterfly valves. 5. Lock-drain device according to claim 1, characterized in that an annular collector of liquid product with a device for its directed discharge is fixed to the plug.

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