Gas filling safety protection system

Abstract

The utility model discloses a safety protection system for gas filling. The safety protection system comprises a liquid storage tank, a plunger pump, a gasifier, an electric contact pressure gauge, a residual liquid storage tank, a motor, a temperature sensor and a safety valve, an output port of the gasifier is connected with the main pipeline, the electric contact pressure gauge is arranged on the main pipeline, and a plurality of gas cylinder filling branch pipes are arranged at the tail end of the main pipeline; and a switching device is arranged on the gas cylinder filling branch pipe and comprises a buffer pressure relief bottle, a three-way pipe, a guide and change valve, a filling valve and a fastening support table. The switching device is arranged on the pipe body of the gas cylinder filling branch pipe, the buffer pressure relief bottle is used for storing excessive gas, the gas flow steering component is fixed through the buffer pressure relief bottle, other structural parts do not need to be additionally arranged on a gas cylinder opening, the cost and operation complexity are reduced, the structure is more stable and simpler, installation is easy, and use is convenient. And only the existing gas cylinder filling branch pipe needs to be cut off and connected into the switching device.

Description

Technical Field

[0001] The utility model relates to the technical field of gas filling, in particular to a gas filling safety protection system. Background Art

[0002] The gas filling system is used to gasify the liquid gas source and transport it into the gas cylinder. To ensure the safety and feasibility of the filling process, it is necessary to monitor the filling parameters such as pressure and temperature in real time.

[0003] At present, the pressure monitoring method of the gas filling system is mainly to set a pressure sensor on the pipeline. When the controller determines that the pipeline is over-pressured based on the detection parameters of the pressure sensor, the motor is controlled to cut off the power and stop working to prevent the filling equipment from continuing to supply gas. However, in actual application, technical personnel in this field have found that if the plunger pump continues to work due to reasons such as the hysteresis of the motor shutdown, it is easy to over-pressure, which in turn reduces the safety of filling. In order to solve the above technical problems, technical personnel in this field set an external exhaust pipe at the joint of the gas cylinder. If it is detected that the gas continues to be supplied after the shutdown, the gas is directly transported back to the residual liquid tank through the external exhaust pipe. Although the above method can solve the problem of abnormal overpressure in the pipeline, vibration will occur when the high-pressure gas switches the pipeline, which can easily cause the gas cylinder joint to separate from the gas cylinder and swing, causing personal injury. Summary of the invention

[0004] To solve the above technical problems, the utility model provides a gas filling safety protection system. In order to have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. This summary is not a general review, nor is it intended to identify key / important components or describe the scope of protection of these embodiments. Its only purpose is to present some concepts in a simple form as a preface to the detailed description that follows.

[0005] The utility model adopts the following technical solutions:

[0006] Provided is a gas filling safety protection system, comprising: a liquid storage tank, a plunger pump, a vaporizer and an electric contact pressure gauge, wherein the output port of the vaporizer is connected to a main pipeline, the electric contact pressure gauge is arranged on the main pipeline, and a plurality of gas cylinder filling branches are arranged at the end of the main pipeline;

[0007] A switching device is provided on the gas cylinder filling branch pipe;

[0008] The switching device includes: a buffer pressure relief bottle, a three-way pipe, a guide valve, a filling valve and a fastening support; a mounting platform is arranged at the bottle mouth of the buffer pressure relief bottle, the guide valve is arranged on the mounting platform, the fastening support is arranged on the buffer pressure relief bottle, and the three-way pipe is arranged on the fastening support; the first pipe mouth of the three-way pipe is connected with the guide valve, the second pipe mouth of the three-way pipe is connected with the gas cylinder filling branch pipe, the filling valve is arranged on the third pipe mouth of the three-way pipe, and the filling valve is connected with the gas cylinder filling branch pipe.

[0009] Furthermore, the gas filling safety protection system also includes: a first liquid main pipeline, a second liquid main pipeline and a return air pipeline; the two ends of the first liquid main pipeline are respectively connected to the liquid outlet of the liquid storage tank and the liquid inlet of the plunger pump; the two ends of the second liquid main pipeline are respectively connected to the inlet of the gasifier and the liquid outlet of the plunger pump; the two ends of the return air pipeline are respectively connected to the plunger pump and the return air port of the liquid storage tank.

[0010] Furthermore, the gas filling safety protection system also includes: a residual liquid storage tank; the liquid storage tank is connected to the residual liquid storage tank via a first discharge pipe; the buffer pressure relief bottle is connected to the residual liquid storage tank via a second discharge pipe.

[0011] Furthermore, the gas filling safety protection system also includes: a motor for driving the plunger pump; the control input end of the motor is connected to the control output end of the controller; the signal output end of the electric contact pressure gauge is connected to the signal input end of the controller; the control input end of the guide valve and the filling valve is connected to the control output end of the controller.

[0012] Furthermore, the gas filling safety protection system further includes: a temperature sensor, wherein the temperature sensor is arranged on the main pipeline, and a signal output end of the temperature sensor is connected to a signal input end of the controller.

[0013] Furthermore, the gas filling safety protection system further includes: a safety valve and a venting pipe; the venting pipe is connected to the main pipe, and the safety valve is arranged on the venting pipe.

[0014] Furthermore, the gas filling safety protection system further includes: a stop button, which is connected to the signal input terminal of the controller.

[0015] Furthermore, a branch pressure gauge is provided on each of the gas cylinder filling branch pipes and at the connection position between the main pipeline and each of the gas cylinder filling branch pipes.

[0016] Furthermore, the gas cylinder filling branch pipe includes: a front branch pipe and a rear branch pipe; the two ends of the front branch pipe are respectively connected to the end of the main pipeline and the second pipe opening of the three-way pipe; the two ends of the rear branch pipe are respectively connected to the filling valve and the filling connector.

[0017] Furthermore, the fastening support includes: a support body, a support rod and a clamp, the support body is arranged on the buffer pressure relief bottle, the support rod is arranged on the support body, and the clamp is arranged at the top of the support rod and connected to the three-way pipe.

[0018] The beneficial effects brought about by the utility model: the present application sets a switching device on the tube body of the gas cylinder filling branch pipe, uses a buffer pressure relief bottle to store excess gas, and uses the buffer pressure relief bottle to fix the airflow diverting component. First, there is no need to add other structural parts to the gas cylinder mouth, thereby reducing costs and operational complexity. Second, the buffer pressure relief bottle is used to fix the three-way pipe and the gas cylinder filling branch pipe, which makes the structure more stable and reduces the probability of the gas cylinder joint detaching and swinging. Third, the structure is simple and easy to install. It only requires cutting off the existing gas cylinder filling branch pipe and connecting it to the switching device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a structural schematic diagram of a gas filling safety protection system of the utility model;

[0021] Figure 2 It is a schematic diagram of the connection between the gas cylinder filling branch pipe and the switching device of the utility model. DETAILED DESCRIPTION

[0022] The following is a detailed description of the embodiments of the utility model in conjunction with the accompanying drawings. It should be clear that the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] like Figure 1-2 As shown, in some illustrative embodiments, a gas filling safety protection system is provided, including: a liquid storage tank 1, a plunger pump 2, a vaporizer 3, an electric contact pressure gauge 4, a residual liquid storage tank 5, a motor 6, a temperature sensor 7, a branch pressure gauge 8, a pipeline portion, and a safety valve 11.

[0024] The pipeline part includes: a first liquid main pipeline 121, a second liquid main pipeline 23, a return gas pipeline 122, a first discharge pipeline 15, a main pipeline 9, a gas cylinder filling branch pipe 10, and an emptying pipeline 111.

[0025] The liquid storage tank 1 is used to store a gas source, which is a cryogenic liquid, such as liquid nitrogen, liquid oxygen, liquid argon and other liquids. The liquid storage tank 1 is connected to the plunger pump 2 through a first liquid main pipeline 121. Specifically, both ends of the first liquid main pipeline 121 are respectively connected to the liquid outlet of the liquid storage tank 1 and the liquid inlet of the plunger pump 2, and the connection method can be selected as a flange connection or a threaded connection.

[0026] The plunger pump 2 is used to provide power for the liquid to flow. The plunger pump 2 is connected to the vaporizer 3 through the second liquid main pipeline 23. Specifically, the two ends of the second liquid main pipeline 23 are respectively connected to the inlet of the vaporizer 3 and the liquid outlet of the plunger pump 2, and the connection method can be selected as flange connection or threaded connection.

[0027] The vaporizer 3 is a device for vaporizing liquid gas, mainly because of its large surface area. When filling the gas, the liquid gas source discharged from the liquid storage tank 1 is transported to the plunger pump 2 via the first liquid main pipeline 121, and then supplied to the vaporizer 3 by the plunger pump 2 via the second liquid main pipeline 23, and the vaporizer 3 converts the liquid gas source into a gaseous gas source. The two ends of the return gas pipeline 122 are respectively connected to the return gas port of the plunger pump 2 and the return gas port of the liquid storage tank 1. During the filling process, part of the gas source will be vaporized without being processed by the vaporizer 3. Therefore, this part of the gas is transported back to the liquid storage tank 1 by the plunger pump 2 via the return gas pipeline 122, and the return gas and the liquid gas in the liquid storage tank 1 are cooled and liquefied for recovery.

[0028] The liquid storage tank 1 is connected to the residual liquid storage tank 5 through the first discharge pipe 15. The pressure P1 of the liquid storage tank 1 needs to satisfy P1≤0.02MPa. When it is higher than 0.02MPa, it needs to be depressurized. At this time, it can be discharged to the residual liquid storage tank 5 through the first discharge pipe 15 to ensure the safety of the system.

[0029] The output port of the gasifier 3 is connected to the head end of the main pipeline 9, and a plurality of gas cylinder filling branches 10 are arranged at the end of the main pipeline 9, that is, the gas source of the gasifier 3 is transported by the main pipeline 9 and then distributed to each gas cylinder filling branch 10, and a gas cylinder joint is arranged at the end of the gas cylinder filling branch 10, and the gas cylinder joint is used to connect with the mouth of the gas cylinder to be filled. Each gas cylinder filling branch 10 can be switched.

[0030] The electric contact pressure gauge 4 is arranged on the main pipeline 9 to monitor the pressure value of the main pipeline 9. The temperature sensor 7 is arranged on the main pipeline 9, and the specific position is closer to the side of the vaporizer 3 than the electric contact pressure gauge 4, and is used to monitor the gas temperature in the pipeline. Branch pressure gauges 8 are arranged on each gas cylinder filling branch pipe 10, and at the connection position between the main pipeline 9 and each gas cylinder filling branch pipe 10, and the branch pressure gauges 8 are used to monitor the gas pressure in the gas cylinder filling branch pipe 10.

[0031] The motor 6 is used to drive the plunger pump 2 to work, and the two are connected in a chain action relationship, that is, when the motor 6 stops rotating, the plunger pump 2 also stops conveying the medium.

[0032] The venting pipe 111 is connected to the main pipe 9. According to the gas transmission direction, the venting pipe 111 is located at the rear side of the electric contact pressure gauge 4, and the safety valve 11 is arranged on the venting pipe 111. The set pressure of the safety valve 11 is 16.5MPa. When the pressure is higher than 16.5MPa, the valve will start to vent. The gas will be discharged through the venting pipe 111 to ensure the safety of the system.

[0033] The controller mentioned in this embodiment is used for data processing and the sending of control signals. Existing devices that can realize logical control functions can be used. In the following text, the control output terminal mentioned refers to the port where the device can output control signals, the control input terminal refers to the port where the device can receive control signals, the signal output terminal refers to the port that can output electrical signals containing information, and the signal input terminal refers to the port that can receive point signals containing information.

[0034] The control input end of the motor 6 is connected to the control output end of the controller, and the controller sends a control signal to the motor, which is used to control the start / stop of the motor 6. The signal output end of the electric contact pressure gauge 4 is connected to the signal input end of the controller, and the information collected by the electric contact pressure gauge 4 is uploaded to the controller, and the controller processes the data. The pressure of the electric contact pressure gauge is ≤16.5MPa. When it is higher than 16.5MPa, the motor 6 is powered off and the pump is stopped. The signal output end of the temperature sensor 7 is connected to the signal input end of the controller, and the information collected by the temperature sensor 7 is uploaded to the controller. The controller processes the data. The outlet temperature of the vaporizer 3 is ≥-15.0℃. When it is lower than -15.0℃, the motor 6 is powered off and the pump is stopped. The stop button 12 is connected to the signal input end of the controller. When the stop button 12 is pressed when the gauge pressure exceeds 16.5MPa, the motor 6 is powered off and the pump is stopped.

[0035] A switching device 100 is provided on the cylinder filling branch pipe 10. After the controller sends a control signal to the motor 6, if the motor continues to work, the electric contact pressure gauge 4 will collect information that the pressure in the main pipeline continues to rise. At this time, the switching device changes the gas delivered from the cylinder filling branch pipe 10 to the cylinder to the buffer pressure relief bottle to reduce the system pressure. In addition, after taking the pressure relief measures, if the pressure in the main pipeline continues to rise, the gas in the system can also be delivered to the buffer pressure relief bottle to achieve the record pressure relief.

[0036] The switching device 100 includes: a buffer pressure relief bottle 101, a three-way pipe 102, a guide valve 103, a filling valve 104, a mounting platform 105 and a fastening support platform.

[0037] A mounting platform 105 is provided at the bottle mouth of the buffer pressure relief bottle 101. The mounting platform 105 is a metal annular structure for mounting the pilot valve 103. The pilot valve 103 can be any existing electrically controlled valve. The pilot valve 103 is connected to the mounting platform 105 by threaded connection. The fastening support is provided on the buffer pressure relief bottle 101, and the three-way pipe 102 is provided on the fastening support. The three-way pipe 102 is an airflow steering component and is prone to vibration, shaking, etc. The function of the fastening support is to use the buffer pressure relief bottle 101 as a base to support and fix the three-way pipe 102 to ensure the structural connection stability when switching the airflow.

[0038] The fastening support includes: a support body 106, a support rod 107 and a clamp 108. The support body 106 is arranged on the buffer pressure relief bottle 101, specifically around the bottle mouth of the buffer pressure relief bottle 101. The number of support rods 107 is 2 or 4, which are evenly arranged on the support body 106 and gathered upward. The clamp 108 is arranged at the top of the support rod 107 and connected to the tee 102. The connection means that the clamp 108 binds the tee 102 to the top of the support rod 107 to achieve the reinforcement and fixation of the tee 102.

[0039] The first pipe opening of the three-way pipe 102 is connected to the guide valve 103; the third pipe opening of the three-way pipe 102 is connected to the filling valve 104; the second pipe opening of the three-way pipe 102 is connected to the gas cylinder filling branch pipe 10.

[0040] The cylinder filling branch pipe 10 includes: a front branch pipe 1001 and a rear branch pipe 1002. One end of the front branch pipe 1001 is connected to the end of the main pipeline 9, and the other end is connected to the second pipe opening of the three-way pipe 102. One end of the rear branch pipe 1002 is connected to the filling valve 104, and the other end is connected to the filling joint.

[0041] The control input ends of the switching valve 103 and the filling valve 104 are both connected to the control output end of the controller. When the pressure of the cylinder filling branch pipe 10 increases abnormally, the filling valve 104 is closed, the switching valve 103 is opened, and the pressure relief is carried out to the buffer pressure relief bottle 101. When the pressure relief measures of the cylinder or pipeline fail, the filling valve 104 is opened or closed, and the switching valve 103 is opened to relieve pressure to the buffer pressure relief bottle 101. During normal filling, the switching valve 103 is closed.

[0042] The buffer pressure relief bottle 101 is connected to the residual liquid storage tank 5 through the second discharge pipe 1015. The buffer pressure relief bottle 101 delivers the pressure relief gas to the residual liquid storage tank 5 for further processing.

[0043] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A gas filling safety protection system, It is characterized in that include: A liquid storage tank, a plunger pump, a vaporizer and an electric contact pressure gauge, wherein the output port of the vaporizer is connected to the main pipeline, the electric contact pressure gauge is arranged on the main pipeline, and a plurality of gas cylinder filling branches are arranged at the end of the main pipeline; A switching device is provided on the gas cylinder filling branch pipe; The switching device includes: a buffer pressure relief bottle, a three-way pipe, a guide valve, a filling valve and a fastening support; a mounting platform is arranged at the bottle mouth of the buffer pressure relief bottle, the guide valve is arranged on the mounting platform, the fastening support is arranged on the buffer pressure relief bottle, and the three-way pipe is arranged on the fastening support; the first pipe mouth of the three-way pipe is connected with the guide valve, the second pipe mouth of the three-way pipe is connected with the gas cylinder filling branch pipe, the filling valve is arranged on the third pipe mouth of the three-way pipe, and the filling valve is connected with the gas cylinder filling branch pipe.

2. A gas filling safety protection system according to claim 1, It is characterized in that Also includes: A first liquid main pipeline, a second liquid main pipeline and a return air pipeline; the two ends of the first liquid main pipeline are respectively connected to the liquid outlet of the liquid storage tank and the liquid inlet of the plunger pump; the two ends of the second liquid main pipeline are respectively connected to the inlet of the vaporizer and the liquid outlet of the plunger pump; the two ends of the return air pipeline are respectively connected to the plunger pump and the return air port of the liquid storage tank.

3. A gas filling safety protection system according to claim 2, It is characterized in that Also includes: Residual liquid storage tank; the liquid storage tank is connected to the residual liquid storage tank through a first discharge pipe; the buffer pressure relief bottle is connected to the residual liquid storage tank through a second discharge pipe.

4. A gas filling safety protection system according to claim 3, It is characterized in that Also includes: A motor for driving the plunger pump; a control input end of the motor is connected to a control output end of the controller; The signal output end of the electric contact pressure gauge is connected to the signal input end of the controller; the control input ends of the pilot valve and the filling valve are connected to the control output end of the controller.

5. A gas filling safety protection system according to claim 4, It is characterized in that Also includes: A temperature sensor is arranged on the main pipeline, and a signal output end of the temperature sensor is connected to a signal input end of a controller.

6. A gas filling safety protection system according to claim 5, It is characterized in that Also includes: A safety valve and a venting pipeline; the venting pipeline is connected to the main pipeline, and the safety valve is arranged on the venting pipeline.

7. A gas filling safety protection system according to claim 6, It is characterized in that Also includes: A stop button is connected to the signal input terminal of the controller.

8. A gas filling safety protection system according to claim 7, It is characterized in that Branch pressure gauges are provided on each of the gas cylinder filling branch pipes and at the connection positions between the main pipeline and each of the gas cylinder filling branch pipes.

9. A gas filling safety protection system according to claim 8, It is characterized in that The gas cylinder filling branch pipe includes: a front branch pipe and a rear branch pipe; the two ends of the front branch pipe are respectively connected to the end of the main pipeline and the second pipe opening of the three-way pipe; the two ends of the rear branch pipe are respectively connected to the filling valve and the filling joint.

10. A gas filling safety protection system according to claim 9, It is characterized in that The fastening support comprises: a support body, a support rod and a clamp, the support body is arranged on the buffer pressure relief bottle, the support rod is arranged on the support body, and the clamp is arranged on the top end of the support rod and connected to the three-way pipe.

Images