Online detection device for breather valve

Abstract

The utility model relates to the technical field of breather valve detection equipment, in particular to a breather valve online detection device which comprises a first pipeline, the tail end of the first pipeline is connected with the air inlet end of a stop valve, and the air outlet end of the stop valve is connected with the air inlet end of a pressure reducing valve through a second pipeline. The air outlet end of the pressure reducing valve is connected with the air inlet end of a first three-way switching valve through a third pipeline, the first air outlet end of the first three-way switching valve is connected with the first air inlet end of a second three-way switching valve through a fourth pipeline, and the air outlet end of the second three-way switching valve is connected with the first air inlet end of a pressure stabilizing tank through a fifth pipeline. And a balance needle valve is arranged at the first air outlet end of the pressure stabilizing tank. The breather valve online detection device can perform online detection on the breather valve, and improves the efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of breathing valve detection equipment, in particular to an online breathing valve detection device. Background Art

[0002] The breather valve is a crucial accessory for protecting storage tanks. Installed on the top of the tank, it consists of a pressure valve and a vacuum valve. Its primary function is to maintain the tank's airtightness, maintain pressure balance, and reduce volatilization. The breather valve fully utilizes the tank's inherent pressure-bearing capacity to minimize media emissions. It utilizes the weight of the positive and negative pressure valve discs to control the tank's positive exhaust pressure and negative intake pressure. Automatic ventilation balances the internal and external pressures of the tank, ensuring its safety. According to the SYT 0511.1-2010 standard, "Petroleum Storage Tank Accessories Part 1: Breather Valves," breather valves must be inspected at least annually, and performance tests such as opening pressure and leakage are essential. The current offline calibration device for breathing valves is to disassemble the breathing valve, clamp it on a calibration table, use a calibration medium (such as nitrogen, compressed air, etc.) to drive the positive pressure opening of the breathing valve (i.e., the opening of the positive pressure valve disc in the breathing valve) and drive the negative pressure opening of the breathing valve (i.e., the opening of the negative pressure valve disc in the breathing valve) by vacuuming with a vacuum pump, and confirm the opening pressure value of the breathing valve by observing the micro pressure gauge. This offline detection method not only has a long detection cycle, high cost, and high labor intensity, but also affects safety. Utility Model Content

[0003] The utility model aims to provide an online detection device for a breathing valve, which can perform online detection on the breathing valve.

[0004] The utility model adopts the following technical solutions to achieve the above purpose:

[0005] A breathing valve online detection device comprises a first pipeline, wherein the end of the first pipeline is connected to the air inlet end of the stop valve, the air outlet end of the stop valve is connected to the air inlet end of the pressure reducing valve via a second pipeline, the air outlet end of the pressure reducing valve is connected to the air inlet end of a first three-way switching valve via a third pipeline, the first air outlet end of the first three-way switching valve is connected to the first air inlet end of a second three-way switching valve via a fourth pipeline, the air outlet end of the second three-way switching valve is connected to the first air inlet end of a pressure stabilizing tank via a fifth pipeline, and the first air outlet end of the pressure stabilizing tank is provided with a balancing needle valve.

[0006] Preferably, a first pressure gauge is provided on the first pipeline, a second pressure gauge is provided on the third pipeline, and a third pressure gauge is provided at the second gas outlet end of the pressure-surge tank.

[0007] Preferably, the second air outlet end of the first three-way switching valve is connected to the second air inlet end of the second three-way switching valve via a sixth pipeline, and a negative pressure generator is provided on the sixth pipeline.

[0008] Preferably, a first micro-pressure sensor is provided on the third pipeline; a third three-way switching valve is provided on the third air outlet end of the pressure-stabilizing tank, and a second micro-pressure sensor and a third micro-pressure sensor are respectively provided on the two air outlet ends of the third three-way switching valve.

[0009] Preferably, the fourth air outlet end of the pressure-surge tank is connected to the breathing valve via a seventh pipeline.

[0010] Preferably, the first end of the first pipeline is connected to a gas source.

[0011] Preferably, the pressure reducing valve is a precision pressure reducing valve.

[0012] Beneficial effects of the utility model:

[0013] (1) The present invention provides an embodiment in which the pressure-reducing valve and the balancing needle valve are used to slowly adjust the air pressure in the pressure-regulating tank, thereby facilitating the subsequent detection of the breathing valve. A negative pressure generator is provided on the sixth pipeline. When the gas enters the negative pressure generator, negative pressure is generated, thereby generating a negative pressure in the pressure-regulating tank, thereby facilitating the negative pressure detection of the breathing valve.

[0014] (2) In one embodiment of the present invention, the first micro-pressure sensor can transmit the detected value to an external system for recording, and can detect and record the air pressure in the third pipeline in real time, thereby reducing errors. The second micro-pressure sensor is used to detect positive pressure values, and the third micro-pressure sensor is used to detect negative pressure values. The detected values can be transmitted to an external system for recording, and can detect and record the air pressure in the pressure-stabilizing tank in real time, thereby reducing errors.

[0015] The utility model can perform online detection on the breathing valve, thereby improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the present utility model.

[0017] In the figure: first pipeline 1, stop valve 2, second pipeline 3, pressure reducing valve 4, third pipeline 5, first three-way switching valve 6, fourth pipeline 7, second three-way switching valve 8, fifth pipeline 9, pressure regulating tank 10, balancing needle valve 11, first pressure gauge 12, second pressure gauge 13, third pressure gauge 14, sixth pipeline 15, negative pressure generator 16, seventh pipeline 17, breathing valve 18, air source 19, first micro-pressure sensor 20, third three-way switching valve 21, second micro-pressure sensor 22, third micro-pressure sensor 23. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] like Figure 1As shown, the present invention provides an embodiment, which provides an online detection device for a breathing valve, comprising a first pipeline 1, the end of the first pipeline 1 being connected to the air inlet of a stop valve 2, the air outlet of the stop valve 2 being connected to the air inlet of a pressure reducing valve 4 via a second pipeline 3, the air outlet of the pressure reducing valve 4 being connected to the air inlet of a first three-way switching valve 6 via a third pipeline 5, the first air outlet of the first three-way switching valve 6 being connected to the first air inlet of a second three-way switching valve 8 via a fourth pipeline 7, the air outlet of the second three-way switching valve 8 being connected to the first air inlet of a pressure stabilizing tank 10 via a fifth pipeline 9, the first air outlet of the pressure stabilizing tank 10 being provided with a balancing needle valve 11. The stop valve 2 is used to open or close the connection between the first pipeline 1 and the second pipeline 3, the first three-way switching valve 6 is used to open or close the connection between the third pipeline 5 and the fourth pipeline 7, and the second three-way switching valve 8 is used to open or close the connection between the fourth pipeline 7 and the fifth pipeline 9, to facilitate subsequent detection of the breathing valve 18. The air pressure in the pressure-surge tank 10 can be slowly adjusted by the pressure-reducing valve 4 and the balancing needle valve 11 , which facilitates the subsequent detection of the breathing valve 18 .

[0020] A first pressure gauge 12 is provided on the first pipeline 1 for detecting the pressure value in the first pipeline 1, a second pressure gauge 13 is provided on the third pipeline 5 for detecting the pressure value in the third pipeline 5, and a third pressure gauge 14 is provided on the second air outlet end of the pressure stabilizing tank 10 for detecting the pressure value in the pressure stabilizing tank 10.

[0021] The second air outlet end of the first three-way switching valve 6 is connected to the second air inlet end of the second three-way switching valve 8 through the sixth pipe 15. A negative pressure generator 16 is provided on the sixth pipe 15. After the gas enters the negative pressure generator 16, negative pressure will be generated, so that negative pressure will be generated in the pressure regulating tank 10, which is convenient for the negative pressure detection of the breathing valve 18.

[0022] The fourth air outlet end of the pressure-sustaining tank 10 is connected to the breathing valve 18 via the seventh pipe 17. When the pressure-sustaining tank 10 is tested in the forward direction, the seventh pipe 17 is connected to the air inlet end of the breathing valve 18. When the pressure-sustaining tank 10 is tested in the reverse direction, the seventh pipe 17 is connected to the air outlet end of the breathing valve 18.

[0023] The first end of the first pipe 1 is connected to a gas source 19 , which may be a nitrogen source 19 , but is not limited thereto.

[0024] This embodiment provides two detection methods: forward detection and reverse detection. When using forward detection online, the shutoff valve on the pipe connecting the storage tank and the breathing valve 18 must be closed. Due to the high cost of shutoff valves, they are generally not installed on the pipe connecting the storage tank and the breathing valve 18. Therefore, forward detection is suitable for pipes connecting the storage tank and the breathing valve 18 with a shutoff valve, while reverse detection is suitable for pipes connecting the storage tank and the breathing valve 18 without a shutoff valve.

[0025] The breathing valve 18 has a positive pressure valve disc and a negative pressure valve disc. The positive pressure detection is used to detect the opening pressure of the positive pressure valve disc, and the negative pressure detection is used to detect the opening pressure of the negative pressure valve disc.

[0026] 1. Forward Detection

[0027] (1) Positive pressure detection: The gas is introduced into the first pipeline 1 through the nitrogen source 19, the stop valve 2 is slowly opened, and then the pressure reducing valve 4 is slowly adjusted so that the gas in the first pipeline 1 is introduced into the third pipeline 5. Then the first three-way switching valve 6 and the second three-way switching valve 8 are adjusted so that the gas passes from the first outlet end of the first three-way switching valve 6 and the first inlet end of the second three-way switching valve 8, and finally enters the pressure stabilizing tank 10 along the fifth pipeline 9. Then, by adjusting the pressure reducing valve 4 and the balancing needle valve 11, the air pressure in the pressure stabilizing tank 10 is slowly increased until the positive pressure valve disc is opened. When the positive pressure valve disc is opened, the value displayed on the third pressure gauge 14 is the pressure value of the positive pressure opening of the breathing valve.

[0028] (2) Negative pressure detection: The gas is introduced into the first pipeline 1 through the nitrogen source 19, the stop valve 2 is slowly opened, and then the pressure reducing valve 4 is slowly adjusted so that the gas in the first pipeline 1 is introduced into the third pipeline 5. Then the first three-way switching valve 6 and the second three-way switching valve 8 are adjusted so that the gas passes through the second outlet end of the first three-way switching valve 6 and enters the sixth pipeline 15. Subsequently, the gas enters the negative pressure generator 16 and generates negative pressure, so that negative pressure is also generated in the pressure stabilizing tank 10. Then, by adjusting the pressure reducing valve 4 and the balancing needle valve 11, the negative air pressure in the pressure stabilizing tank 10 is slowly increased until the negative pressure valve disc is opened. When the negative pressure valve disc is opened, the value displayed on the third pressure gauge 14 is the pressure value of the negative pressure opening of the breathing valve.

[0029] 2. Reverse Detection

[0030] (1) Positive pressure detection: The gas is introduced into the first pipeline 1 through the nitrogen source 19, the stop valve 2 is slowly opened, and then the pressure reducing valve 4 is slowly adjusted so that the gas in the first pipeline 1 is introduced into the third pipeline 5. Then the first three-way switching valve 6 and the second three-way switching valve 8 are adjusted so that the gas passes from the second outlet end of the first three-way switching valve 6 into the sixth pipeline 15. Then the gas enters the negative pressure generator 16 to generate negative pressure, so that negative pressure is also generated in the pressure regulating tank 10. Then, by adjusting the pressure reducing valve 4 and the balancing needle valve 11, the negative air pressure in the pressure regulating tank 10 is slowly increased until the negative pressure valve disc opens. When the positive pressure valve disc opens, the value displayed on the third pressure gauge 14 is: the sum of the pressure value of the positive pressure opening of the breathing valve and the basic pressure value in the storage tank; then this value is subtracted from the basic pressure value in the storage tank to obtain the pressure value of the positive pressure opening of the breathing valve.

[0031] (2) Negative pressure detection: The gas is introduced into the first pipeline 1 through the nitrogen source 19, the stop valve 2 is slowly opened, and then the pressure reducing valve 4 is slowly adjusted so that the gas in the first pipeline 1 is introduced into the third pipeline 5, and then the first three-way switching valve 6 and the second three-way switching valve 8 are adjusted so that the gas passes from the first outlet end of the first three-way switching valve 6 and the first inlet end of the second three-way switching valve 8, and finally enters the pressure regulating tank 10 along the fifth pipeline 9, and then the pressure reducing valve 4 and the balancing needle valve 11 are adjusted to slowly increase the air pressure in the pressure regulating tank 10 until the negative pressure valve disc is opened. When the negative pressure valve disc is opened, the value displayed on the third pressure gauge 14 is: the sum of the pressure value of the negative pressure opening of the breathing valve and the basic pressure value in the storage tank; then the basic pressure value in the storage tank is subtracted from this value to obtain the pressure value of the negative pressure opening of the breathing valve.

[0032] In one embodiment of the present invention, which is based on the previous embodiment, a first micro-pressure sensor 20 is provided on the third pipe 5. The first micro-pressure sensor 20 can transmit the detected value to an external system for recording, and can detect and record the air pressure in the third pipe 5 in real time to reduce errors.

[0033] The third air outlet end of the pressure-stabilizing tank 10 is provided with a third three-way switching valve 21, and the two air outlet ends of the third three-way switching valve 21 are respectively provided with a second micro-pressure sensor 22 and a third micro-pressure sensor 23. The second micro-pressure sensor 22 is used to detect positive pressure values, and the third micro-pressure sensor 23 is used to detect negative pressure values. The detected values can be transmitted to an external system for recording, and the air pressure in the pressure-stabilizing tank 10 can be detected and recorded in real time to reduce errors.

[0034] When performing positive pressure detection in the forward direction and negative pressure detection in the reverse direction, the third three-way switching valve 21 switches to the second micro-pressure sensor 22, so that the second micro-pressure sensor 22 detects the pressure inside the pressure-stabilizing tank 10; when performing negative pressure detection in the forward direction and positive pressure detection in the reverse direction, the third three-way switching valve 21 switches to the third micro-pressure sensor 23, so that the third micro-pressure sensor 23 detects the pressure inside the pressure-stabilizing tank 10.

[0035] In one embodiment of the present invention, which is based on any one of the above embodiments, the pressure reducing valve 4 is a precision pressure reducing valve 4 that can precisely regulate the air pressure in the pressure stabilizing tank 10 .

[0036] The stop valve, three-way switching valve, balancing needle valve, pressure gauge, negative pressure generator, micro-pressure sensor, and precision pressure reducing valve in the present invention are all existing technologies, which are clearly understood by those skilled in the art and will not be described in detail here.

[0037] The above description is only a preferred embodiment of the present invention and should not be understood as limiting the present application. All equivalent changes and modifications made within the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A breathing valve online detection device, characterized in that: The invention comprises a first pipeline, the end of the first pipeline is connected to the air inlet end of the stop valve, the air outlet end of the stop valve is connected to the air inlet end of the pressure reducing valve via a second pipeline, the air outlet end of the pressure reducing valve is connected to the air inlet end of the first three-way switching valve via a third pipeline, the first air outlet end of the first three-way switching valve is connected to the first air inlet end of the second three-way switching valve via a fourth pipeline, the air outlet end of the second three-way switching valve is connected to the first air inlet end of the pressure stabilizing tank via a fifth pipeline, and the first air outlet end of the pressure stabilizing tank is provided with a balancing needle valve.

2. The breathing valve online detection device according to claim 1, characterized in that: The first pipeline is provided with a first pressure gauge, the third pipeline is provided with a second pressure gauge, and the second gas outlet end of the pressure-surge tank is provided with a third pressure gauge.

3. The breathing valve online detection device according to claim 1, characterized in that: The second air outlet end of the first three-way switching valve is connected to the second air inlet end of the second three-way switching valve via a sixth pipeline, and a negative pressure generator is provided on the sixth pipeline.

4. The breathing valve online detection device according to claim 1, characterized in that: The third pipeline is provided with a first micro-pressure sensor; the third gas outlet end of the pressure-stabilizing tank is provided with a third three-way switching valve, and the two gas outlet ends of the third three-way switching valve are respectively provided with a second micro-pressure sensor and a third micro-pressure sensor.

5. The breathing valve online detection device according to claim 1, characterized in that: The fourth gas outlet end of the pressure-sustaining tank is connected to the breathing valve via a seventh pipeline.

6. The breathing valve online detection device according to claim 1, characterized in that: The first end of the first pipeline is connected to a gas source.

7. The breathing valve online detection device according to claim 1, characterized in that: The pressure reducing valve is a precision pressure reducing valve.

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