Gas replacement valve group of gas cylinder

Abstract

The utility model discloses a gas replacement valve group of a gas cylinder, which comprises a tee joint, a connecting pipe, a gas inlet pipe and a gas outlet pipe are respectively arranged at an opening of the tee joint, ports of the gas inlet pipe and the gas outlet pipe are sealed, a valve I and a gas inlet branch pipe are arranged on the gas inlet pipe, a check valve is arranged on the gas inlet branch pipe, and a valve II and a gas outlet branch pipe are arranged on the gas outlet pipe. And joints are arranged at ports of the connecting pipe, the air inlet branch pipe and the air outlet branch pipe. Compared with the prior art, the device is simple in structure, and hazardous gas in the gas cylinder can be rapidly and safely replaced.

Description

Technical Field

[0001] The utility model belongs to the field of hazardous waste treatment, and in particular relates to a replacement valve group for replacing hazardous gases in a gas cylinder. Background Art

[0002] Gas cylinders are often used to contain toxic, harmful, flammable, explosive, and asphyxiating gases. Gas cylinders are generally equipped with cylinder valves and pressure gauges. The cylinder valves are used to control the intake and exhaust of the cylinders, and the pressure gauges are used to monitor the pressure inside the cylinders.

[0003] During the disposal of hazardous waste cylinders, there is often some residual gas in the cylinders, and the composition is unknown. During the subsequent cylinder cutting operation, gas leakage can easily lead to safety risks such as poisoning and explosion. For this reason, the hazardous gas in the cylinder needs to be replaced and discharged as much as possible. At present, gas replacement equipment is mainly aimed at large containers, which have complex structures and are difficult to apply to gas cylinders. The existing method of replacing gas in gas cylinders is to manually repeatedly disconnect and connect the gas cylinder with the replacement gas pipe and the discharge pipe, and to fill and discharge the gas cylinder to complete the replacement of the gas in the gas cylinder. This method is more cumbersome to operate, and it is easy to cause gas leakage when replacing the pipeline, resulting in casualties. Utility Model Content

[0004] The utility model aims to overcome the problems of complicated operation and great potential safety hazards of existing gas cylinder gas replacement, and to provide a gas cylinder gas replacement valve group with convenient operation and high safety.

[0005] The utility model adopts a technical solution to solve the technical problem: a gas cylinder gas replacement valve group comprises a tee, a connecting pipe, an air inlet pipe and an air outlet pipe are respectively arranged at the opening of the tee, the ports of the air inlet pipe and the air outlet pipe are sealed, a valve I and an air inlet branch pipe are arranged on the air inlet pipe, a check valve is arranged on the air inlet branch pipe, a valve II and an air outlet branch pipe are arranged on the air outlet pipe, and joints are arranged at the ports of the connecting pipe, the air inlet branch pipe and the air outlet branch pipe.

[0006] Optionally, the ports of the air inlet pipe and the air outlet pipe are sealed by packing, and valve I and valve II are mainly composed of a valve flow port, a valve core and a valve stem. The valve flow port is fixed on the inner wall of the pipe, the valve core is located in the inner cavity of the pipe, one end of the valve stem is located in the inner cavity of the pipe and is fixedly connected to the valve core, and the other end of the valve stem passes through the packing and extends out of the pipe. A handwheel is provided on the valve stem, and the valve stem is threadedly connected to the packing. The valve stem drives the valve core to perform linear reciprocating motion in the inner cavity of the pipe, and the valve core opens and closes the valve flow port.

[0007] Optionally, a guide column is sleeved and fixed on the valve stem, a sealing ring is provided between the guide column and the inner wall of the tube, and the sealing ring is fixed on the guide column.

[0008] The use method of the utility model is as follows: when in use, first close valves I and II, connect the air inlet branch pipe with the replacement air pipe, connect the replacement air pipe with the replacement air source, connect the air outlet branch pipe with the discharge pipe, connect the discharge pipe with the gas processing equipment, then connect with the gas cylinder through the connecting pipe, open the gas cylinder valve of the gas cylinder; inflate the gas cylinder, open valve I, and the replacement gas enters the gas cylinder in sequence through the air inlet branch pipe, the check valve, the air inlet pipe, valve I, the three-way and the connecting pipe. As the replacement gas continuously enters the gas cylinder, the pressure in the gas cylinder increases continuously, and the pressure of the gas cylinder is observed by the pressure gauge on the gas cylinder. After the pressure rises to a certain value, close valve I; exhaust the gas cylinder and open valve II. The mixed gas in the gas cylinder is discharged through the connecting pipe, tee, outlet pipe, valve II and outlet branch pipe in sequence. As the mixed gas is continuously discharged from the gas cylinder, the pressure in the gas cylinder continues to decrease. After the pressure of the gas cylinder drops to a certain value as observed by the pressure gauge on the gas cylinder, close valve II; after repeating the gas cylinder inflation and exhaust operations a certain number of times, the dangerous gas in the gas cylinder is basically replaced. Then disconnect the gas cylinder from the connecting pipe and replace it with the next gas cylinder that needs to replace gas.

[0009] The principle of the utility model is to connect three ends (gas cylinder, replacement gas pipe and discharge pipe) through a connecting pipe, an air inlet branch pipe and an air outlet branch pipe, and to form different airways by opening and closing valves I and II, so as to realize multiple charging and degassing of the gas cylinder more conveniently, quickly and safely, thereby completing the replacement of dangerous gases in the gas cylinder. The cooperation of the check valve and valve I can effectively avoid the pollution of the replacement gas in the air inlet branch pipe.

[0010] Compared with the prior art, the utility model has at least the following beneficial effects: the utility model has a simple structure and can replace the dangerous gas in the gas cylinder more quickly and safely. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the longitudinal section structure of the utility model;

[0012] The components described in the accompanying drawings are marked as follows: tee 1, connecting pipe 2, inlet pipe 3, outlet pipe 4, valve Ⅰ5, inlet branch pipe 6, check valve 7, valve Ⅱ8, outlet branch pipe 9, connector 10, packing 11, valve flow port 12, valve core 13, valve stem 14, handwheel 15, guide column 16, sealing ring 17. DETAILED DESCRIPTION

[0013] Embodiment 1, below combines Figure 1To further illustrate the utility model, a gas cylinder gas replacement valve group comprises a tee 1, a connecting pipe 2, an air inlet pipe 3 and an air outlet pipe 4 are respectively provided at the opening of the tee, the tee, the connecting pipe, the air inlet pipe and the air outlet pipe are integrally formed, the ports of the air inlet pipe and the air outlet pipe are sealed, a valve I 5 and an air inlet branch pipe 6 are provided on the air inlet pipe, the valve I is installed on the air inlet pipe, the air inlet branch pipe is welded on the air inlet pipe and connected therewith, the air inlet branch pipe is located at the front end (air inlet end) of the valve I, a check valve 7 is installed on the air inlet branch pipe, a valve II 8 and an air outlet branch pipe 9 are provided on the air outlet pipe, the valve II is installed on the air outlet pipe, the air outlet branch pipe is welded on the air outlet pipe and connected therewith, the air outlet branch pipe is located at the rear end (air outlet end) of the valve II, and joints 10 are provided at the ports of the connecting pipe, the air inlet branch pipe and the air outlet branch pipe, and the joints can be pipe connectors such as threads and quick joints.

[0014] In order to improve the overall sealing performance of the pipeline, the ports of the air inlet pipe and the air outlet pipe are sealed by packing 11. Valve I and valve II are mainly composed of a valve flow port 12, a valve core 13 and a valve stem 14. The valve flow port is fixed on the inner wall of the pipe, the valve core is located in the inner cavity of the pipe, one end of the valve stem is located in the inner cavity of the pipe and is fixedly connected to the valve core, the other end of the valve stem passes through the packing and extends out of the pipe, a handwheel 15 is fixed on it, the valve stem is threadedly connected to the packing, the valve stem drives the valve core to perform a linear reciprocating motion in the inner cavity of the pipe, the valve core opens and closes the valve flow port, a guide column 16 is sleeved and fixed on the valve stem, a sealing ring 17 is provided between the guide column and the inner wall of the pipe, and the sealing ring is fixed on the guide column through an annular groove provided on the guide column.

[0015] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A gas cylinder gas displacement valve assembly, comprising a tee (1), characterized in that: A connecting pipe (2), an air inlet pipe (3) and an air outlet pipe (4) are respectively provided at the opening of the tee, the ports of the air inlet pipe and the air outlet pipe are sealed, a valve I (5) and an air inlet branch pipe (6) are provided on the air inlet pipe, a check valve (7) is provided on the air inlet branch pipe, a valve II (8) and an air outlet branch pipe (9) are provided on the air outlet pipe, and joints (10) are provided at the ports of the connecting pipe, the air inlet branch pipe and the air outlet branch pipe.

2. The gas cylinder gas replacement valve assembly according to claim 1, characterized in that: The ports of the air inlet pipe and the air outlet pipe are sealed by packing (11). The valve I and valve II are mainly composed of a valve flow port (12), a valve core (13) and a valve stem (14). The valve flow port is fixed to the inner wall of the pipe, the valve core is located in the inner cavity of the pipe, one end of the valve stem is located in the inner cavity of the pipe and is fixedly connected to the valve core, and the other end of the valve stem passes through the packing and extends out of the pipe. A hand wheel (15) is provided on the valve stem. The valve stem is threadedly connected to the packing. The valve stem drives the valve core to perform linear reciprocating motion in the inner cavity of the pipe, and the valve core opens and closes the valve flow port.

3. The gas cylinder gas replacement valve assembly according to claim 2, characterized in that: A guide column (16) is sleeved and fixed on the valve stem, and a sealing ring (17) is provided between the guide column and the inner wall of the tube, and the sealing ring is fixed on the guide column.

Images