Air source pressure control system

Abstract

The utility model provides a gas source pressure control system, which comprises a gas cylinder group comprising at least two gas cylinders, each gas cylinder is respectively arranged on a branch and is used for providing a high-pressure gas source through a main path, and the branches are mutually connected in parallel and are connected to the main path; the switch valves are arranged at the gas cylinder outlets of the branches and are used for controlling the opening and closing of the gas cylinders on the branches; the electric pressure reducer is arranged on the main path, is connected with the gas cylinder group through the main path and is used for reducing the pressure of a gas source; and the control valve is arranged at the downstream of the electric pressure reducer on the main path and is used for controlling a switch of the main path gas source. The system can be dynamically adjusted according to the needed outlet pressure, pressure adjusting automation is achieved, and time and labor cost are effectively saved.

Description

Technical Field

[0001] The utility model relates to the field of gas cylinder gas supply systems, in particular to a gas source pressure control system. Background Art

[0002] The existing gas source control system requires manual operation on site, that is, the gas cylinder can only be connected to the gas supply system by manually opening the corresponding valve. In addition, during the pressure adjustment process of the gas supply system, the operator needs to observe the pressure gauge and manually adjust the number of gas supply cylinders to balance the pressure of low-pressure gas cylinders and high-pressure gas cylinders. When the gas supply pressure is higher than a certain value, the gas source pressure can be reduced to the required pressure by venting.

[0003] On the one hand, the existing gas source control system can make the entire pressure adjustment process more complicated, resulting in more gas waste, and the gas source pressure cannot be maintained at a certain pressure for a long time; on the other hand, the existing system cannot meet the requirements of frequent adjustment of gas source pressure. In addition, the operator's frequent adjustment of the number of gas cylinders will also increase safety risks and reduce gas supply efficiency.

[0004] In view of this, it is urgent to design a gas source pressure control system with high reliability and automatic pressure regulation. Utility Model Content

[0005] The utility model aims to overcome the deficiencies of the prior art and provide a gas source pressure control system.

[0006] The utility model provides a gas source pressure control system, comprising: a gas cylinder group, comprising at least two gas cylinders, each gas cylinder is respectively arranged on a branch road for providing a high-pressure gas source through a main road, wherein the branches are connected in parallel with each other and are all connected to the main road; a switch valve, arranged at the gas cylinder outlet of each branch road, for controlling the switch of the gas cylinder on the branch road; an electric pressure reducer, arranged on the main road and connected to the gas cylinder group through the main road, for reducing the pressure of the gas source; a control valve, arranged on the main road at the downstream of the electric pressure reducer, for controlling the switch of the main road gas source.

[0007] According to an embodiment of the utility model, the gas source pressure control system further comprises: an exhaust valve, which is arranged on an upstream branch road of the main road and is used to exhaust excess gas.

[0008] According to an embodiment of the utility model, the switch valve, the control valve and the exhaust valve are all solenoid valves.

[0009] According to an embodiment of the utility model, the gas source pressure control system further comprises: a filter, which is arranged on the main line upstream of the electric pressure reducer and is used to filter the gas.

[0010] According to an embodiment of the utility model, the gas source pressure control system further comprises: a first pressure sensor, which is arranged upstream of the electric pressure reducer and is used to monitor the gas source pressure before pressure reduction.

[0011] According to an embodiment of the present utility model, the gas source pressure control system further comprises: a second pressure sensor, which is arranged downstream of the electric pressure reducer and is used to monitor the gas source pressure after the pressure reduction.

[0012] According to one embodiment of the utility model, the gas source pressure control system further comprises: a one-way valve and an orifice plate, which are arranged in series downstream of the main path, wherein the one-way valve is used to prevent the gas source from flowing in reverse, and the orifice plate is used to measure the flow rate of the gas source.

[0013] According to an embodiment of the utility model, the switch valve, the control valve and the exhaust valve are all electrically connected to a programmable logic controller PLC through relays and receive digital outputs thereof.

[0014] According to an embodiment of the present utility model, the first pressure sensor and the second pressure sensor are electrically connected to the programmable logic controller PLC and input pressure signal analog quantities thereto.

[0015] According to an embodiment of the present utility model, the electric pressure reducer is electrically connected to the programmable logic controller PLC and receives its analog output.

[0016] In this application, the on-off valve and the control valve can be used to control the on-off of the gas source on the branch and the main line, and the pressure of the gas source outlet is automatically adjusted by an electric pressure reducer, which is dynamically adjusted according to the required outlet pressure to achieve automatic pressure regulation, effectively saving time and labor costs.

[0017] It should be understood that the above general description and the following specific embodiments are only exemplary and illustrative and are not intended to limit the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The following drawings are a part of the specification of the present utility model, which illustrate exemplary embodiments of the present utility model. The attached drawings and the description of the specification are used to explain the principle of the utility model.

[0019] Figure 1 It is a schematic diagram of a gas source pressure control system according to an embodiment of the utility model;

[0020] Figure 2 is a schematic diagram of an air source pressure control system of another embodiment of the utility model;

[0021] Figure 3 It is a schematic diagram of an air source pressure control system according to another embodiment of the utility model.

[0022] Reference numerals:

[0023] 100-gas cylinder group, 101-gas cylinder, 200-switch valve, 300-electric pressure reducer, 301-first pressure sensor, 302-second pressure sensor, 400-control valve, 500-exhaust valve, 600-filter, 700-check valve, 800-orifice plate. DETAILED DESCRIPTION

[0024] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are used to illustrate the principles of the present invention, and are not configured to limit the present invention. In addition, the structural components in the drawings are not necessarily drawn to scale. For example, the sizes of some structural components or areas in the drawings may be enlarged for other structural components or areas to help understand the embodiments of the present invention.

[0025] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the embodiments of the utility model. In the description of the utility model, it should be noted that, unless otherwise specified, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0026] In addition, the terms "include", "comprise", "have" or any other variations thereof are intended to cover non-exclusive inclusion, so that a structure or component including a series of elements includes not only those elements, but also other mechanical elements that are not explicitly listed or inherent in the structure or component. In the absence of more restrictions, the elements defined by the sentence "include..." do not exclude the existence of other identical elements in the article or device including the elements.

[0027] Spatially related terms such as "below", "beneath", "under", "low", "above", "on", "high", etc. are used to facilitate description to explain the positioning of one element relative to a second element, indicating that these terms are intended to cover different orientations of the device in addition to orientations different from those shown in the figures. In addition, for example, "one element is above / below another element" can mean that the two elements are in direct contact, or that there are other elements between the two elements. In addition, terms such as "first", "second", etc. are also used to describe various elements, regions, parts, etc., and should not be regarded as limiting. Similar terms represent similar elements throughout the description.

[0028] For those skilled in the art, the present invention can be implemented without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present invention by showing examples of the present invention.

[0029] Figure 1 It is a schematic diagram of a gas source pressure control system according to an embodiment of the utility model; Figure 2 is a schematic diagram of an air source pressure control system of another embodiment of the utility model; Figure 3 It is a schematic diagram of an air source pressure control system according to another embodiment of the utility model.

[0030] like Figure 1 As shown, the utility model provides a gas source pressure control system, including: a gas cylinder group 100, including at least two gas cylinders 101, each gas cylinder 101 is respectively arranged on a branch road for providing a high-pressure gas source through a main road, wherein the branches are connected in parallel to each other and are all connected to the main road; a switch valve 200, arranged at the outlet of the gas cylinder 101 of each branch road, for controlling the switch of the gas cylinder 101 on the branch road; an electric pressure reducer 300, arranged on the main road and connected to the gas cylinder group 100 through the main road, for reducing the pressure of the gas source; a control valve 400, arranged on the main road downstream of the electric pressure reducer 300, for controlling the switch of the main road gas source.

[0031] Specifically, the gas cylinders 101 of the gas cylinder group 100 are connected to the gas inlet of the switch valve 200 of each gas cylinder 101 through a pipeline, and the gas source is connected to the main road through the gas outlet of the switch valve 200 through a pipeline, and the gas source is decompressed to a set pressure value through the electric pressure reducer 300 on the main road. The electric pressure reducer 300 is connected to the gas inlet of the control valve 400, and the decompressed gas source reaches the gas source application system through the gas outlet of the control valve 400.

[0032] Among them, the switch valve 200 and the control valve 400 in the gas source pressure control system in this embodiment can control the on and off of the gas source on the branch and the main road. The pressure of the gas source outlet is adjusted by the electric pressure reducer 300, which can be dynamically adjusted according to the required outlet pressure, realizing the automation of pressure regulation, effectively saving time and labor costs, and having safe, reliable performance and high efficiency.

[0033] like Figure 2 As shown, according to one embodiment of the present utility model, the gas source pressure control system further includes an exhaust valve 500, which is arranged on the upstream branch of the main road for exhausting excess gas.

[0034] According to an embodiment of the present invention, the switch valve 200 , the control valve 400 and the exhaust valve 500 are all solenoid valves.

[0035] According to an embodiment of the present invention, the gas source pressure control system further includes a filter 600, which is arranged upstream of the electric pressure reducer 300 on the main line and is used to filter the gas.

[0036] According to an embodiment of the present invention, the air source pressure control system further includes a first pressure sensor 301 , which is disposed upstream of the electric pressure reducer 300 and is used to monitor the air source pressure before pressure reduction.

[0037] According to an embodiment of the present invention, the air source pressure control system further includes a second pressure sensor 302 , which is disposed downstream of the electric pressure reducer 300 and is used to monitor the air source pressure after the pressure is reduced.

[0038] According to one embodiment of the utility model, the gas source pressure control system also includes a one-way valve 700 and an orifice plate 800, which are arranged in series downstream of the main path, wherein the one-way valve 700 is used to prevent the gas source from flowing in reverse, and the orifice plate 800 is used to measure the flow rate of the gas source.

[0039] like Figure 3 As shown, according to one embodiment of the present invention, the switch valve 200, the control valve 400 and the exhaust valve 500 are all electrically connected to the programmable logic controller PLC through relays and receive the digital output thereof.

[0040] According to an embodiment of the present invention, the first pressure sensor 301 and the second pressure sensor 302 are electrically connected to a programmable logic controller PLC and input pressure signal analog quantities thereto.

[0041] According to an embodiment of the present invention, the electric pressure reducer 300 is electrically connected to a programmable logic controller PLC and receives its analog output.

[0042] Specifically, the switch valve 200 can be connected to the tee of the main road through the air supply branch, one side outlet of the tee is connected to the exhaust valve 500, and the other side outlet of the tee is connected to the air inlet of the filter 600, and the air outlet of the filter 600 is connected to the air inlet of the electric pressure reducer 300. A first pressure sensor 301 for monitoring the air source before decompression is added between the filter 600 and the electric pressure reducing valve. The air outlet of the electric pressure reducer 300 is connected to the control valve 400, and a second pressure sensor 302 for monitoring the air source after decompression is added between the electric pressure reducer 300 and the control valve 400, and the control valve 400 is connected to the air source test system through the one-way valve 700 and the orifice plate 800.

[0043] The analog output signals of the first pressure sensor 301 and the second pressure sensor 302 are connected to the analog input terminals of the programmable logic controller PLC. The digital output terminals of the programmable logic controller PLC are connected to and control the coils of the switch valve 200, the exhaust valve 500, and the control valve 400 through the solid-state relay K, wherein the switch valve 200, the control valve 400, and the exhaust valve 500 are all solenoid valves. The analog output signal of the programmable logic controller PLC is connected to the electric pressure reducer 300 through the terminal.

[0044] In one embodiment, a touch screen M can be added to connect to a programmable logic controller PLC via Ethernet, and the touch screen M can be arranged at multiple points in the factory area or the measurement and control building to achieve remote control. The programmable logic controller PLC can collect the pressure values ​​of the first pressure sensor 301 and the second pressure sensor 302 to achieve pressure regulation automation by controlling the electric pressure reducer 300.

[0045] In specific operation, the electric pressure reducer 300 is composed of a straight-stroke electric actuator and a low-resistance straight-through single-seat valve, wherein the electric actuator is an electronic integrated structure with an amplifier inside and can be remotely controlled. In such an electric pressure reducer 300, the input control signal can control the opening of the low-resistance straight-through single-seat valve in the electric pressure reducer 300 through the action of the electric actuator, thereby adjusting the pressure working condition parameters.

[0046] In one embodiment, the programmable logic controller PLC opens the switch valves 200 of two of the gas cylinders 101, allowing the two gas cylinders 101 to be connected to the main pipeline. After the pressure in the main pipeline is stabilized, the programmable logic controller PLC starts to perform PID regulation on the outlet pressure through the set pressure value and the actual pressure fed back by the outlet pressure sensor. The programmable logic controller PLC adjusts the opening of the electric pressure reducer 300 through analog output until the outlet pressure reaches the set pressure.

[0047] In an optional embodiment, when the programmable logic controller PLC initially opens the control valve 400, or when the outlet gas consumption is large, the pressure value fed back by the second pressure sensor 302 becomes smaller, and the programmable logic controller PLC continuously adjusts the opening of the low-flow resistance straight-through single-seat valve in the electric pressure reducer 300 through PID regulation to stabilize the outlet pressure near the set pressure value.

[0048] Exemplarily, when the pressure difference between the first pressure sensor 301 and the second pressure sensor 302 is less than the set value, the programmable logic controller PLC determines that the gas cylinder 101 currently in use cannot meet the current operating conditions. In this case, the programmable logic controller PLC shuts down the two previously used gas cylinders 101 and opens the other two new gas cylinders 101. When shutting down the gas cylinders 101, the pressure values ​​of the first two gas cylinders 101 when shutting down are recorded. When the pressure value required by the operating condition is lower than the pressure value when the first two gas cylinders 101 are shut down, the programmable logic controller PLC will give priority to using the first two gas cylinders 101 so that the entire system reaches the optimal gas usage state.

[0049] The gas source pressure control system in the present application can be applied to a variety of gas source media, such as high-pressure oxygen, high-pressure methane, high-pressure nitrogen, compressed air, etc. Among them, if the system is applied in a high-pressure oxygen environment, a valve made of nickel-based alloy material is required.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas source pressure control system, characterized in that: include: A gas cylinder group, comprising at least two gas cylinders, each gas cylinder being arranged on a branch line for providing a high-pressure gas source through a main line, wherein the branches are connected in parallel to each other and are all connected to the main line; A switch valve is arranged at the outlet of the gas cylinder of each branch to control the switch of the gas cylinder on the branch; An electric pressure reducer, arranged on the main road and connected to the gas cylinder group through the main road, for reducing the pressure of the gas source; A control valve is arranged on the main line at the downstream of the electric pressure reducer and is used to control the switch of the main line gas source.

2. The air source pressure control system according to claim 1, characterized in that: Also includes: An exhaust valve is arranged on the upstream branch of the main path to exhaust excess gas.

3. The air source pressure control system according to claim 2, characterized in that: The switch valve, the control valve and the exhaust valve are all solenoid valves.

4. The air source pressure control system according to claim 1, characterized in that: Also includes: A filter is arranged on the main line upstream of the electric pressure reducer and is used for filtering gas.

5. The air source pressure control system according to claim 3, characterized in that: Also includes: The first pressure sensor is arranged upstream of the electric pressure reducer to monitor the gas source pressure before pressure reduction.

6. The air source pressure control system according to claim 5, characterized in that: Also includes: The second pressure sensor is arranged downstream of the electric pressure reducer to monitor the pressure of the gas source after the pressure is reduced.

7. The air source pressure control system according to claim 1, characterized in that: Also includes: A one-way valve and an orifice plate are arranged in series downstream of the main path, wherein the one-way valve is used to prevent the gas source from flowing in reverse, and the orifice plate is used to measure the flow rate of the gas source.

8. The air source pressure control system according to claim 6, characterized in that: The switch valve, the control valve and the exhaust valve are all electrically connected to a programmable logic controller (PLC) through relays and receive digital outputs thereof.

9. The air source pressure control system according to claim 8, characterized in that: The first pressure sensor and the second pressure sensor are electrically connected to the programmable logic controller PLC and input pressure signal analog quantities thereto.

10. The air source pressure control system according to claim 9, characterized in that: The electric pressure reducer is electrically connected to the programmable logic controller PLC and receives its analog output.

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