Overpressure, underpressure and overflow detection system for gas self-closing valve

Abstract

The utility model discloses an overpressure, underpressure and overflow detection system for a gas self-closing valve, which comprises a detection table which is sequentially connected with a first-stage pressure regulating valve, a second-stage pressure regulating valve, a gas flowmeter, a first low-pressure pressure regulating valve and a second low-pressure pressure regulating valve through pipelines. An overpressure throttle valve, an underpressure throttle valve and an overflow throttle valve are respectively connected behind the second low-pressure regulating valve through parallel pipelines; the front of the primary pressure regulating valve is connected with a gas source through a pipeline, and a to-be-tested gas self-closing valve is mounted between an outlet of the gas flow meter and the first low-pressure pressure regulating valve; and stop valves are respectively arranged on pipelines in front of the overpressure throttle valve, the underpressure throttle valve and the overflow throttle valve. The device can be simultaneously suitable for various safety detections of the gas self-closing valve, is convenient for pressure adjustment, and improves the testing efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to the detection technical field relates to the performance improvement of gas self -closing valve detection system, specifically to a kind of gas self -closing valve overpressure underpressure overcurrent detection system. BACKGROUND

[0002] Gas is the general term of gaseous fuel, it belongs to chemical energy, mainly through burning to release heat energy, for urban residents and industrial enterprises. There are many kinds of gas, mainly natural gas, artificial gas, liquefied petroleum gas and biogas. Since the 21st century, accordingly, the popularization rate of China gas industry has also been rapidly improved. Among them, natural gas is mainly composed of 85% of methane and a small amount of ethane, propane, nitrogen and butane, because of high calorific value, convenient to use, natural gas has become the main way of centralized supply of residential energy.

[0003] In order to ensure the safety of residential gas, the early natural gas pipe network installs gas alarm before entering the house. If natural gas leakage occurs, the gas alarm can issue a prompt sound to remind the user to pay attention to the safety of use. In addition, a small amount of odorant is usually added to natural gas, which reminds the user to use safety after natural gas leakage through taste. But the above-mentioned way is passive safety protection, and there is a certain safety protection deficiency. For example, it cannot provide protection under the conditions of natural gas overpressure, underpressure and overcurrent, and the overpressure, underpressure and overcurrent of natural gas pipeline cover the situation that the user forgets to turn off the stove, which is prone to fire. The current natural gas pipe network will install gas self -closing valve before the stove, by setting gas self -closing valve, when natural gas appears overpressure, underpressure and overcurrent, the natural gas pipe network is automatically closed, and the safety protection mode is active, so that the safety of residential gas can be improved.

[0004] After the production of gas self -closing valve, it is generally detected by sampling and then put into the market after passing the detection. The gas company will also conduct secondary detection on all gas self -closing valves before installation. Because the gas self -closing valve has the closing function under the condition of various gas pressures and flow rates, and the existing detection system for the valve can only detect different functions separately, and it is not easy to adjust and control during detection, resulting in low detection efficiency. UTILITY MODEL CONTENT

[0005] The utility model aims at providing a kind of gas self -closing valve overpressure underpressure overcurrent detection system, to solve the deficiency existing in the safety detection of existing gas self -closing valve.

[0006] In order to realize the purpose of the utility model, the following technical scheme is adopted:

[0007] The gas self-closing valve overpressure, underpressure and over-flow detection system comprises a detection table, a gas source, a first pressure regulating valve, a second pressure regulating valve, a gas flow meter, a first low-pressure pressure regulating valve, a second low-pressure pressure regulating valve, an overpressure throttle valve, an underpressure throttle valve and an over-flow throttle valve.

[0008] In order to further achieve the purpose of the utility model, the following technical solutions can also be used:

[0009] The gas self-closing valve overpressure, underpressure and over-flow detection system as described above, wherein the gas source is 680KPa compressed air provided by an air compressor.

[0010] The gas self-closing valve overpressure, underpressure and over-flow detection system as described above, wherein a total stop valve and a filter are installed on the pipeline between the first pressure regulator and the gas source inlet.

[0011] The gas self-closing valve overpressure, underpressure and over-flow detection system as described above, wherein a pressure relief valve is installed on the pipeline before the gas flow meter inlet.

[0012] The gas self-closing valve overpressure, underpressure and over-flow detection system as described above, wherein the pressure range of the overpressure automatic closing of the measured gas self-closing valve is 8KPa±2KPa, and the underpressure automatic closing pressure range is 0.8KPa±0.2KPa.

[0013] The gas self-closing valve overpressure, underpressure and over-flow detection system as described above, wherein the flow range of the over-flow automatic closing of the measured gas self-closing valve is 1.08m 3 / h-1.32m 3 / h.

[0014] The utility model has the advantages of:

[0015] The utility model can be suitable for the overpressure, underpressure and over-flow safety detection of the gas self-closing valve, and realizes the purpose of a system capable of detecting multiple functions of the gas self-closing valve. In addition, according to the different characteristics of the gas self-closing valve in the overpressure, underpressure and over-flow states, the first pressure regulating valve, the second pressure regulating valve, the first low-pressure pressure regulating valve and the second low-pressure pressure regulating valve can quickly adjust the test gas of the pipeline to a reasonable pressure, thereby greatly improving the test efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description.

[0017] Figure 1 is a system schematic diagram of the present application.

[0018] Reference signs:

[0019] 1 - total stop valve, 2 - filter, 3 - primary pressure regulating valve, 4 - secondary pressure regulating valve, 5 - pressure relief valve, 6 - gas flow meter, 7 - gas self-closing valve, 8 - first low pressure regulating valve, 9 - second low pressure regulating valve, 10 - overpressure throttle valve, 11 - underpressure throttle valve, 12 - over-flow throttle valve. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical scheme in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments.

[0021] In the description of the embodiments of the present application, unless otherwise explicitly limited, the words such as setting, installing and connecting should be understood in a broad sense, and the skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0022] As shown in the description of the embodiments of the present application, a gas self-closing valve 7 overpressure underpressure over-flow detection system disclosed by the present embodiment includes a detection table, a plurality of pipe supports are installed on the detection table, and the corresponding valve body is fixedly installed above the detection table through the pipe supports. Figure 1 The primary pressure regulating valve 3, the secondary pressure regulating valve 4, the gas flow meter 6, the first low pressure regulating valve 8 and the second low pressure regulating valve 9 are connected in sequence through pipes in sequence. The primary pressure regulating valve 3 is connected to a gas source through a pipe in front of the primary pressure regulating valve 3, and the gas source is 680KPa compressed air provided by an air compressor. The pressure regulating range of the primary pressure regulating valve 3 is 800KPa-50KPa.

[0023] The second low pressure regulating valve 9 is connected to the overpressure throttle valve 10, the underpressure throttle valve 11 and the over-flow throttle valve 12 through parallel pipes respectively after the second low pressure regulating valve 9; and the gas self-closing valve 7 to be detected is installed between the outlet of the gas flow meter 6 and the first low pressure regulating valve 8.

[0024]

[0025] ​The range of the secondary pressure regulating valve 4 is 60KPa-6KPa, the pressure regulating range of the first low pressure regulating valve 8 is 3KPa-1KPa, and the pressure regulating range of the second low pressure regulating valve 9 is 1KPa-0.6KPa.

[0026] In order to ensure the purity of the gas source, a total stop valve 1 and a filter 2 are installed on the pipeline between the primary pressure regulator and the gas source inlet.

[0027] In order to control the gas supply pressure after the secondary pressure regulating valve 4, a pressure relief valve 5 is installed on the pipeline before the gas flow meter 6 inlet.

[0028] In the utility model, the pressure range of the self-closing valve 7 for measuring gas is automatically closed under overpressure is 8KPa±2KPa, and the self-closing valve 7 should be closed when the upper limit of the pressure range is exceeded to protect the safety of gas use. 3 The flow range of the self-closing valve 7 for measuring gas is automatically closed under over-flow is 1.08m 3 / h-1.32m 3 / h, and the self-closing valve 7 should be closed when the upper limit of the flow range is exceeded.

[0029] When testing, under the overpressure condition of the self-closing valve 7 for measuring gas, the primary pressure regulating valve 3 and the secondary pressure regulating valve 4 are used for gas pressure regulation, at this time, the overpressure throttle valve 10 is opened, and the underpressure throttle valve 11 and the over-flow throttle valve 12 are closed through the respective stop valves.

[0030] The technical contents not described in the utility model are known technologies.

Claims

1. A gas self-closing valve overpressure, underpressure, and overcurrent detection system, comprising a detection platform, characterized in that, The testing platform is connected in sequence via pipes to a primary pressure regulating valve, a secondary pressure regulating valve, a gas flow meter, a first low-pressure regulating valve, and a second low-pressure regulating valve. After the second low-pressure regulating valve, parallel pipes connect to an overpressure throttling valve, an underpressure throttling valve, and an overflow throttling valve, respectively. A gas source is connected before the primary pressure regulating valve via a pipe. A self-closing valve for the gas to be tested is installed between the outlet of the gas flow meter and the first low-pressure regulating valve. The pressure regulating range of the primary pressure regulating valve is 800 kPa-50 kPa, the range of the secondary pressure regulating valve is 60 kPa-6 kPa, the pressure regulating range of the first low-pressure regulating valve is 3 kPa-1 kPa, and the pressure regulating range of the second low-pressure regulating valve is 1 kPa-0.6 kPa. Shut-off valves are installed on the pipes before the overpressure throttling valve, the underpressure throttling valve, and the overflow throttling valve, respectively.

2. The gas self-closing valve overpressure, underpressure, and overcurrent detection system according to claim 1, characterized in that, The air source is 680 kPa compressed air supplied by an air compressor.

3. The gas self-closing valve overpressure, underpressure, and overcurrent detection system according to claim 1, characterized in that, A main shut-off valve and a filter are installed at intervals on the pipeline between the primary pressure regulator and the gas source inlet.

4. The gas self-closing valve overpressure, underpressure, and overcurrent detection system according to claim 1, characterized in that, A pressure-reducing and venting valve is installed on the pipeline before the gas flow meter inlet.

5. The gas self-closing valve overpressure, underpressure, and overcurrent detection system according to claim 1, characterized in that, The pressure range for automatic shut-off of the gas under test valve when overpressure is 8 kPa ± 2 kPa, and the pressure range for automatic shut-off when underpressure is 0.8 kPa ± 0.2 kPa.

6. The gas self-closing valve overpressure, underpressure, and overcurrent detection system according to claim 1, characterized in that, The flow rate range for the automatic shut-off valve of the gas under test due to overflow is 1.08m³. 3 / h-1.32m 3 / h.

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