A gas cross-flow prevention device for binary or multi-element gas distribution systems

Abstract

This invention provides an anti-gas-crossing device for binary or multi-element gas distribution systems. It solves the problem that during gas distribution, when the shut-off valve is closed, effective sealing cannot be achieved, leading to leakage and the seepage of high-pressure gas into low-pressure gas, resulting in gas cross-flow. The medium- and low-pressure gas pipeline of this invention also includes a third shut-off valve, a differential pressure gauge, and a solenoid valve. The third shut-off valve, the solenoid valve, and the first shut-off valve are arranged sequentially along the airflow direction of the medium- and low-pressure gas pipeline. The two detection terminals of the differential pressure gauge are connected to the inlet and outlet terminals of the third shut-off valve, respectively. The anti-gas-crossing device also includes an electronic control element electrically connected to the differential pressure gauge and the solenoid valve. This element receives the differential pressure signal from the differential pressure gauge and controls the opening or closing of the solenoid valve based on the differential pressure signal. The advantage of this invention is that by installing differential pressure gauges at both ends of the third shut-off valve for real-time monitoring, once a differential pressure is detected, the solenoid valve immediately activates to prevent gas cross-flow.

Description

Technical Field

[0001] This utility model belongs to the technical field of mixed gas filling equipment, and relates to an anti-gas cross-flow device for binary or multi-element gas distribution systems. Background Technology

[0002] Binary or multi-component gas mixing is a technique for precisely mixing two or more gases to prepare a gas mixture of a specific concentration. Its core principle is the precise control of the partial pressure or flow rate of each component gas to ensure that the final gas mixture has an accurate, uniform, and stable concentration.

[0003] Gas mixing process: Low-pressure gas flows into the gas cylinder through pipeline one, with shut-off valve one controlling the opening and closing of pipeline one; high-pressure gas flows into the gas cylinder through pipeline two, with shut-off valve two controlling the opening and closing of pipeline two. During the gas mixing process, due to human error or prolonged operation of the shut-off valve, shut-off valve one may fail to achieve an effective seal when closed, resulting in gas leakage. This can lead to high-pressure gas seeping into low-pressure gas, causing gas cross-contamination and reducing the purity of the gas mixing raw materials. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in existing binary or multi-component gas mixing processes by proposing an anti-gas leakage device that can prevent high-pressure gas from leaking into low-pressure gas.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] An anti-gas cross-flow device for a binary or multi-element gas distribution system includes a high-pressure gas pipeline, one or more medium- and low-pressure gas pipelines, and several gas cylinders connecting the high-pressure gas pipeline and the medium- and low-pressure gas pipelines. Each medium- and low-pressure gas pipeline is equipped with a shut-off valve 1 to control its on / off state, and the high-pressure gas pipeline is equipped with a shut-off valve 2 to control its on / off state.

[0007] The device is characterized in that a third shut-off valve, a differential pressure gauge, and a solenoid valve are also provided on the medium-low pressure gas pipeline. The third shut-off valve, the solenoid valve, and the first shut-off valve are arranged sequentially along the airflow direction of the medium-low pressure gas pipeline. The two detection ends of the differential pressure gauge are respectively connected to the inlet end and the outlet end of the third shut-off valve. The anti-gas leakage device also includes an electronic control element, which is electrically connected to the differential pressure gauge and the solenoid valve. It is used to receive the differential pressure signal from the differential pressure gauge and control the solenoid valve to open or close according to the differential pressure signal.

[0008] In the aforementioned anti-gas cross-flow device for a binary or multi-element gas distribution system, the differential pressure gauge controls the solenoid valve to open when it detects that the differential pressure signal exceeds a set threshold.

[0009] In the aforementioned anti-gas-crossing device for a binary or multi-element gas distribution system, the solenoid valve is installed on the pipeline between the third shut-off valve and the first shut-off valve, and the diameter of this pipeline section is smaller than the diameter of the other pipelines.

[0010] In the aforementioned anti-gas-crossing device for a binary or multi-element gas distribution system, the length of the connecting pipeline between the solenoid valve and the first shut-off valve is less than the length of the connecting pipeline between the solenoid valve and the third shut-off valve.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. Anti-gas cross-flow devices can be applied to binary or multi-element gas automatic distribution systems. By installing an automatic control system on each valve, automatic gas distribution and automatic alarm functions can be achieved. Binary gas distribution systems install an anti-gas cross-flow device on one medium- or low-pressure gas pipeline, while multi-element gas distribution systems require anti-gas cross-flow devices on each medium- or low-pressure gas pipeline.

[0013] 2. The core function of the anti-gas leakage device is to prevent high-pressure gas from leaking into medium and low-pressure pipelines and avoid gas leakage, thereby preventing the purity of gas raw materials from decreasing due to gas mixing and ensuring stable gas quality.

[0014] By installing differential pressure gauges at both ends of the third shut-off valve for real-time monitoring, minute leaks caused by the failure of the seal of the first shut-off valve can be detected with extreme sensitivity. Once the pressure difference is detected, the solenoid valve immediately activates, fundamentally preventing high-pressure gas from contaminating the low-pressure gas source and upstream pipelines, thus ensuring the purity and quality of the gas distribution raw materials.

[0015] 3. By placing a faster-responding solenoid valve closer to the leak point (stop valve one), and using a smaller diameter pipe section between stop valve three and stop valve one, the differential pressure gauge can capture the pipeline pressure in a timely manner, ensuring the timeliness and accuracy of pressure detection. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of existing technology;

[0017] Figure 2 This is a schematic diagram of the anti-gas leakage device of this utility model;

[0018] In the diagram, 1 is a high-pressure gas pipeline; 2 is a medium- and low-pressure gas pipeline; 3 is a gas cylinder; 4 is a shut-off valve one; 5 is a shut-off valve two; 6 is a shut-off valve three; 7 is a differential pressure gauge; and 8 is a solenoid valve. Detailed Implementation

[0019] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0020] like Figure 1 As shown, the existing binary gas distribution system includes a high-pressure gas pipeline 1, a medium-low pressure gas pipeline 2, and several gas cylinders 3 connecting the high-pressure gas pipeline 1 and the medium-low pressure gas pipeline 2. The medium-low pressure gas pipeline 2 is equipped with a shut-off valve 4 to control its on / off state, and the high-pressure gas pipeline 1 is equipped with a shut-off valve 5 to control its on / off state. The arrows in the figure indicate the airflow direction.

[0021] During the binary gas distribution process, due to human error or long-term operation of the shut-off valve, the shut-off valve 4 may fail to achieve effective sealing when closed, resulting in gas leakage. This can lead to high-pressure gas seeping into low-pressure gas, causing gas cross-contamination and reducing the purity of the gas distribution raw materials.

[0022] like Figure 2 As shown, the present invention discloses an anti-gas-crossing device for a binary or multi-element gas distribution system, comprising a high-pressure gas pipeline 1, one or more medium- and low-pressure gas pipelines 2, and several gas cylinders 3 connecting the high-pressure gas pipeline 1 and the medium- and low-pressure gas pipelines 2. Each medium- and low-pressure gas pipeline 2 is equipped with a shut-off valve 4 to control its on / off state, and the high-pressure gas pipeline 1 is equipped with a shut-off valve 5 to control its on / off state. The medium- and low-pressure gas pipelines 2 are also equipped with a shut-off valve 6, a differential pressure gauge 7, and a solenoid valve 8, arranged sequentially along the airflow direction of the medium- and low-pressure gas pipelines 2. The two detection ends of the differential pressure gauge 7 are respectively connected to the inlet and outlet ends of the shut-off valve 6. The anti-gas-crossing device also includes an electronic control element electrically connected to the differential pressure gauge 7 and the solenoid valve 8, used to receive the differential pressure signal from the differential pressure gauge 7 and control the solenoid valve 8 to open or close according to the differential pressure signal. The arrows in the figure indicate the airflow direction.

[0023] The solenoid valve 8 is installed in the pipeline between the third shut-off valve 6 and the first shut-off valve 4. The diameter of this pipeline section is smaller than that of other pipelines, and the length of this pipeline section is minimized as much as possible. This allows the differential pressure gauge to capture the pipeline pressure in a timely manner, ensuring the timeliness and accuracy of pressure detection. The length of the connecting pipeline between the solenoid valve 8 and the first shut-off valve is shorter than the length of the connecting pipeline between the solenoid valve 8 and the third shut-off valve 6.

[0024] Set the inlet end of the shut-off valve 6 to a and the outlet end of the shut-off valve 6 to b. When the differential pressure gauge 7 detects that the differential pressure signal exceeds the set threshold, it controls the solenoid valve 8 to open. The accuracy setting of the differential pressure gauge can be appropriately reduced. When the pressure at point b is slightly greater than that at point a, a signal can be sent to open the solenoid valve 8.

[0025] The binary gas mixing process of this utility model is as follows:

[0026] When shut-off valve 2 (5) is closed, shut-off valve 3 (6) and shut-off valve 1 (4) are opened, low-pressure gas is first introduced into gas cylinder 3. After the low-pressure gas has been introduced into the cylinder, shut-off valve 3 (6) and shut-off valve 1 (4) are closed, and shut-off valve 2 (5) is opened, high-pressure gas is introduced into gas cylinder 3.

[0027] During the high-pressure gas filling process, when the differential pressure gauge 7 detects that the gas pressure value at point b is greater than the gas pressure value at point a, it indicates that there is a gas leakage in the shut-off valve 4. The electronic control component sends a signal to the solenoid valve 8, and the solenoid valve 8 opens to release the gas in point b, preventing high-pressure gas from leaking into low-pressure gas and ensuring the purity of low-pressure gas.

[0028] It should be understood that in the claims and description of this utility model, all instances of "comprising..." should be understood as having an open meaning, that is, their meaning is equivalent to "containing at least...", and should not be understood as having a closed meaning, that is, their meaning should not be understood as "containing only...".

[0029] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An anti-gas cross-flow device for a binary or multi-element gas distribution system, comprising a high-pressure gas pipeline (1), one or more medium- and low-pressure gas pipelines (2), and several gas cylinders (3) connecting the high-pressure gas pipeline (1) and the medium- and low-pressure gas pipelines (2), wherein each medium- and low-pressure gas pipeline (2) is provided with a shut-off valve (4) for controlling its opening and closing, and the high-pressure gas pipeline (1) is provided with a shut-off valve (5) for controlling its opening and closing; characterized in that The medium-low pressure gas pipeline (2) is also equipped with a shut-off valve three (6), a differential pressure gauge (7) and a solenoid valve (8). The shut-off valve three (6), the solenoid valve (8) and the shut-off valve one (4) are arranged in sequence along the airflow direction of the medium-low pressure gas pipeline (2). The two detection ends of the differential pressure gauge (7) are respectively connected to the inlet end and the outlet end of the shut-off valve three (6). The anti-gas leakage device also includes an electronic control element, which is electrically connected to the differential pressure gauge (7) and the solenoid valve (8) to receive the differential pressure signal from the differential pressure gauge (7) and control the solenoid valve (8) to open or close according to the differential pressure signal.

2. A device for preventing gas crossflow according to claim 1, wherein When the differential pressure gauge (7) detects that the differential pressure signal exceeds the set threshold, it controls the solenoid valve (8) to open.

3. A device for preventing gas crossflow for binary or multi-component gas distribution systems according to claim 1, characterized in that The shut-off valve 1 (4) and shut-off valve 3 (6) are linked for control, so that they open and close at the same time.

4. A device for preventing gas crossflow according to claim 1, wherein The solenoid valve (8) is installed on the pipeline between the third shut-off valve (6) and the first shut-off valve (4), and the diameter of this pipeline is smaller than the diameter of the other pipelines.

5. A device for preventing gas crossflow according to claim 1, wherein The length of the connecting pipe between the solenoid valve (8) and the first stop valve (4) is less than the length of the connecting pipe between the solenoid valve (8) and the third stop valve (6).

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