Combined valves suitable for venting in PEM water electrolysis hydrogen production systems

Abstract

This utility model discloses a combined valve suitable for venting in a PEM electrolysis water hydrogen production system. It includes a valve body, with a low-pressure venting chamber and a high-pressure venting chamber formed on the upper and lower sides of a piston within the valve cavity, respectively. A discharge port is located at the top of the valve body, and a high-pressure venting interface communicating with the high-pressure venting chamber is located at the lower end of the valve body. A low-pressure venting interface is located at the upper end of the valve body. The outlet of the high-pressure discharge channel within the valve body communicates with the low-pressure venting chamber. Under gravity, the piston is in a state where it is blocked by a lower limiting mechanism. In this state, the inlet of the high-pressure discharge channel is blocked by the piston, and the low-pressure venting interface communicates with the low-pressure venting chamber. When the pressure inside the high-pressure venting chamber increases and pushes the piston upward, connecting the inlet of the high-pressure discharge channel to the high-pressure venting chamber, the low-pressure venting interface is blocked by the piston. The advantages of this utility model are: simple and ingenious structure, practicality, and effective simplification of the venting pipeline structure.

Description

Technical Field

[0001] This utility model relates to the technical field of PEM electrolysis water production hydrogen system, specifically to a control valve for venting. Background Technology

[0002] The venting lines in a PEM water electrolysis hydrogen production system include a high-pressure venting line and a low-pressure venting line. The high-pressure and low-pressure venting lines are set up for two reasons: firstly, the pressures of high-pressure and low-pressure venting are different, thus requiring different venting lines to prevent high-pressure gas from entering the low-pressure side and damaging the low-pressure side equipment; secondly, the exhaust gas from the high-pressure venting also contains water.

[0003] Currently, the high-pressure venting pipeline and the low-pressure venting pipeline are separate, which is complicated. In addition, hydrogen is easily mixed in when the high-pressure venting pipeline is draining, which poses a risk to the safety of the venting. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a combined valve suitable for the venting of a PEM electrolysis water hydrogen production system, which integrates low-pressure venting and high-pressure venting, and can effectively simplify the pipeline structure.

[0005] To solve the above problems, the technical solution adopted by this utility model is: a combined valve suitable for venting in a PEM water electrolysis hydrogen production system, including a valve body, a valve chamber inside the valve body, a piston inside the valve chamber, a low-pressure venting chamber and a high-pressure venting chamber formed on the upper and lower sides of the piston inside the valve chamber, a discharge port communicating with the low-pressure venting chamber at the top of the valve body, a high-pressure venting port at the lower end of the valve body communicating with the high-pressure venting chamber, a low-pressure venting port at the upper end of the valve body, and a high-pressure discharge channel inside the valve body. The outlet of the high-pressure discharge channel is connected to the low-pressure venting chamber. A lower limiting mechanism is installed in the valve chamber. The lower limiting mechanism is located below the inlet of the high-pressure discharge channel. Under the action of gravity, the piston is blocked by the lower limiting mechanism. In this state, the inlet of the high-pressure discharge channel is blocked by the piston, and the low-pressure venting interface is exposed and connected to the low-pressure venting chamber. When the high-pressure venting gas enters the high-pressure venting chamber through the high-pressure venting interface, the pressure in the high-pressure venting chamber increases and pushes the piston upward, so that the inlet of the high-pressure discharge channel is exposed and connected to the high-pressure venting chamber. At this time, the low-pressure venting interface is blocked by the piston.

[0006] Furthermore, the aforementioned combined valve suitable for the venting of a PEM water electrolysis hydrogen production system includes a flame arrester installed at the discharge port.

[0007] Furthermore, in the aforementioned combined valve suitable for venting in a PEM water electrolysis hydrogen production system, a drainage mechanism is provided at the bottom of the valve body. The drainage mechanism includes a drainage pipe with a drainage valve installed on it.

[0008] Furthermore, the aforementioned combined valve suitable for venting in a PEM water electrolysis hydrogen production system includes a float switch assembly for monitoring water level within the high-pressure venting chamber. This float switch assembly comprises a float switch fixedly mounted at the bottom of the valve body and a float rod. An annular float is mounted on the float rod. When there is no liquid or the liquid level is low in the high-pressure venting chamber, gravity causes the float to press against the float switch. When the liquid level in the high-pressure venting chamber increases, the float moves upward along the float rod and disengages from the float switch to the drainage height position, at which point the float switch opens.

[0009] Furthermore, in the aforementioned combined valve suitable for use in a PEM water electrolysis hydrogen production system, the structure of the lower limiting mechanism includes a lower retaining step formed on the inner wall of the valve body.

[0010] Furthermore, the aforementioned combined valve suitable for venting in a PEM water electrolysis hydrogen production system also includes an upper limiting mechanism within the valve body. The upper limiting mechanism includes an upper blocking step located on the inner wall of the valve body, between the low-pressure venting interface and the high-pressure discharge channel outlet.

[0011] The advantages of this utility model are: This application provides a combined valve suitable for venting in a PEM electrolysis water hydrogen production system, which integrates high-pressure side venting gas discharge and low-pressure side venting gas discharge into one unit. The structure is simple, ingenious, and practical. The high-pressure side venting gas discharge and the low-pressure side venting gas discharge are independent of each other and do not interfere with each other, which effectively simplifies the venting pipeline structure. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the combined valve of the present invention, suitable for use in the venting state of a PEM electrolysis water hydrogen production system, in the low-pressure side venting state.

[0013] Figure 2 This is a schematic diagram of the combined valve of the present invention, suitable for use in the venting state of a PEM electrolysis water hydrogen production system, in the venting state on the high-pressure side. Detailed Implementation

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and preferred embodiments.

[0015] like Figure 1 , Figure 2 As shown, a combined valve suitable for venting in a PEM water electrolysis hydrogen production system includes a valve body 1, a valve chamber 2 within the valve body 1, and a piston 3 within the valve chamber 2. A low-pressure venting chamber 21 and a high-pressure venting chamber 22 are formed on the upper and lower sides of the piston 3 within the valve chamber 2, respectively. A discharge port 11 communicating with the low-pressure venting chamber 21 is provided at the top of the valve body 1. For safety, a flame arrester 111 is installed on the discharge port 11.

[0016] A high-pressure venting port 51 is provided at the lower end of the valve body 1, and the high-pressure venting port 51 is connected to the high-pressure venting chamber 22. A low-pressure venting port 4 is provided at the upper end of the valve body 1. A high-pressure discharge channel 6 is also provided inside the valve body 1, and the outlet 62 of the high-pressure discharge channel is connected to the low-pressure venting chamber 21. A lower limiting mechanism is provided inside the valve chamber 2, and the lower limiting mechanism is located below the inlet 61 of the high-pressure discharge channel. In this embodiment, the lower limiting mechanism is a lower blocking step 101 formed on the inner wall of the valve body 1. In order to limit the upward movement position of the piston 3, an upper limiting mechanism is also provided inside the valve body 1 in this embodiment. The upper limiting mechanism includes an upper blocking step 102 formed on the inner wall of the valve body 1, and the upper blocking step 102 is located between the low-pressure venting port 4 and the outlet 62 of the high-pressure discharge channel.

[0017] like Figure 1 As shown, piston 3 is blocked by the lower blocking step 101 under the action of gravity. In this state, the high-pressure discharge channel inlet 61 is blocked by piston 3, and the low-pressure venting interface 4 is exposed and connected to the low-pressure venting chamber 21; low-pressure venting can be carried out in this state. The low-pressure venting gas in the PEM water electrolysis hydrogen production system enters the low-pressure venting chamber 21 through the low-pressure venting interface 4, and then is discharged from the discharge port 11, which realizes the venting on the low-pressure side of the PEM water electrolysis hydrogen production system.

[0018] When the high-pressure venting gas enters the high-pressure venting chamber 22 through the high-pressure venting port 5, the pressure inside the high-pressure venting chamber 22 increases, pushing the piston 3 upward. This exposes the high-pressure discharge channel inlet 61, connecting it to the high-pressure venting chamber 22, while the low-pressure venting port 4 is blocked by the piston 3. Figure 2 As shown. High-pressure venting is possible in this state. The high-pressure venting gas in the PEM water electrolysis hydrogen production system enters the high-pressure venting chamber 22 through the high-pressure venting port 5, then passes through the high-pressure discharge channel inlet 61, the high-pressure discharge channel 6, and the low-pressure venting chamber 21 before being discharged from the discharge port 11. This achieves the venting of the high-pressure side of the PEM water electrolysis hydrogen production system. The high-pressure venting gas enters the high-pressure venting chamber 22. Because the high-pressure venting gas contains a certain amount of moisture, the moisture accumulates in the high-pressure venting chamber 22 under the influence of gravity.

[0019] In this embodiment, a drainage mechanism is provided at the bottom of the valve body 1. The drainage mechanism includes a drainage pipe 12, on which a drainage valve 121 is provided. A float switch assembly 7 for monitoring the water level is also provided in the high-pressure venting chamber 22. The float switch assembly 7 includes a float switch 71 fixedly installed at the bottom of the valve body 1 and a float rod 72. An annular float 73 is provided on the float rod 72. When there is no liquid or the liquid level is low in the high-pressure venting chamber 5, gravity causes the float 73 to press against the float switch 71. When the liquid level in the high-pressure venting chamber 5 increases, the float 73 moves upward along the float rod 72 and disengages from the float switch 71 to the drainage height position, at which point the float switch 71 opens. The purpose of providing the float switch assembly 7 in this embodiment is to monitor the water level in the high-pressure venting chamber 22. When the float 73 reaches the drainage height position, the float switch 71 outputs a drainage signal, at which point the drainage valve 121 opens to discharge water.

[0020] As can be seen from the above, this application provides a combined valve suitable for venting in a PEM water electrolysis hydrogen production system. It integrates high-pressure side venting gas discharge and low-pressure side venting gas discharge into one unit. The structure is simple, ingenious, and practical. The high-pressure side venting gas discharge and the low-pressure side venting gas discharge are independent of each other and do not interfere with each other, which effectively simplifies the venting pipeline structure.

Claims

1. A combined valve suitable for use in a PEM water electrolysis hydrogen production system, comprising a valve body, wherein a valve cavity is provided within the valve body, characterized in that: A piston is installed inside the valve chamber. The upper and lower sides of the piston form a low-pressure venting chamber and a high-pressure venting chamber, respectively. A discharge port communicating with the low-pressure venting chamber is located at the top of the valve body, and a high-pressure venting interface is located at the lower end of the valve body, communicating with the high-pressure venting chamber. A high-pressure discharge channel is also installed inside the valve body, with its outlet communicating with the low-pressure venting chamber. A lower limiting mechanism is installed inside the valve chamber, located below the inlet of the high-pressure discharge channel. Under gravity, the piston is blocked by the lower limiting mechanism. In this state, the inlet of the high-pressure discharge channel is blocked by the piston, while the low-pressure venting interface is exposed and communicating with the low-pressure venting chamber. When high-pressure venting gas enters the high-pressure venting chamber through the high-pressure venting interface, the pressure inside the high-pressure venting chamber increases, pushing the piston upwards and exposing the inlet of the high-pressure discharge channel, thus communicating with the high-pressure venting chamber. At this point, the low-pressure venting interface is blocked by the piston.

2. The combined valve suitable for venting in a PEM water electrolysis hydrogen production system according to claim 1, characterized in that: A flame arrester is installed on the discharge port.

3. The combined valve suitable for venting in a PEM water electrolysis hydrogen production system according to claim 1, characterized in that: The bottom of the valve body is equipped with a drainage mechanism, which includes a drain pipe and a drain valve.

4. The combined valve suitable for venting in a PEM water electrolysis hydrogen production system according to claim 3, characterized in that: The high-pressure venting chamber is also equipped with a float switch assembly for monitoring the water level. The float switch assembly includes a float switch fixedly installed at the bottom of the valve body and a float rod. The float rod is equipped with an annular float. When there is no liquid or the liquid level is low in the high-pressure venting chamber, gravity causes the float to press against the float switch. When the liquid level in the high-pressure venting chamber increases, the float moves upward along the float rod and moves away from the float switch to the drainage height position, at which point the float switch opens.

5. The combined valve suitable for venting in a PEM water electrolysis hydrogen production system according to claim 1, characterized in that: The structure of the lower limiting mechanism includes: a lower blocking step formed on the inner wall of the valve body.

6. The combined valve suitable for venting in a PEM electrolysis water hydrogen production system according to claim 1, characterized in that: The valve body is also provided with an upper limiting mechanism, which includes an upper blocking step set on the inner wall of the valve body. The upper blocking step is located between the low-pressure venting port and the high-pressure discharge channel outlet.

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