Safety pressure relief device driven by temperature

Abstract

The utility model discloses a safety pressure relief device driven by temperature, which comprises a valve body, a through channel is arranged in the valve body, a TPRD valve seat is arranged at one end of the through channel, a temperature sensing glass ball is arranged in the TPRD valve seat, an armored temperature sensor is arranged at the other end of the through channel, and a connecting rod is arranged in the through channel. The two ends of the connecting rod are in contact with the temperature sensing glass ball and the armored temperature sensor respectively, a check ring and a radial sealing ring are arranged on the connecting rod, the sides, close to the temperature sensing glass ball, of the check ring and the radial sealing ring are normal pressure areas, and the ends, close to the armored temperature sensor, of the check ring and the radial sealing ring are pressurized medium areas. And the armored temperature sensor pushes the connecting rod to cling to the temperature sensing glass ball under the action of the pressure medium area. In the normal use process, the sealing effect is achieved due to the medium pressure effect, under the abnormal condition, the whole structure can be driven to move due to the pressure, and gas media can also be discharged normally.

Description

Technical Field

[0001] The utility model relates to the field of hydrogen energy, in particular to a safety pressure relief device driven by temperature. Background Art

[0002] As a part of the hydrogen storage and supply unit, the hydrogen storage cylinder valve is an important component of a fuel cell vehicle. During hydrogen refueling, hydrogen is supplied to the hydrogen storage cylinder through the cylinder valve. During hydrogen supply, hydrogen is transported to the fuel cell by opening and closing the solenoid valve. When an abnormal situation occurs in the gas cylinder, pressure relief is required, that is, the gas is released into the atmosphere to reduce the pressure inside the gas cylinder. When operating the cylinder valve for pressure relief, necessary safety measures must be taken to ensure that there are no flammable substances or other dangerous substances in the environment.

[0003] For example: The patent application document with the application number 202311025669.1 discloses a vehicle hydrogen integrated cylinder valve, including a cylinder valve body and a pressure relief device. The pressure relief device is fixedly arranged on one side of the cylinder valve body. The pressure relief device further includes: a valve cover fixedly installed on the top of the pressure relief device; a temperature-sensitive glass bulb arranged inside the valve cover, with a temperature-sensitive liquid inside the temperature-sensitive glass bulb; a first valve rod arranged inside the pressure relief device, the outer side of the upper end of the first valve rod is closely attached to the inner side of the valve cover, and a first washer is arranged at the connection between the outer side of the upper end of the first valve rod and the inner side of the valve cover; a first O-ring sleeved on the bottom of the first valve rod for sealing; a discharge interface fixedly arranged on one side of the pressure relief device for discharging the medium.

[0004] In the above technical solution, by installing a temperature-sensitive glass bulb in the pressure relief device of the vehicle hydrogen integrated cylinder valve, when the ambient temperature exceeds an abnormal value, the temperature-sensitive liquid in the temperature-sensitive glass bulb expands in volume and breaks, the first valve rod is lifted by the medium pressure, the sealing of the first O-ring fails, and the medium is discharged through the discharge interface. Through double pressure relief of the pressure relief device and the discharge interface, the effect of quickly discharging the gas medium in case of an abnormal situation is achieved.

[0005] However, it still has the following problems:

[0006] 1. The temperature sensor probe set in it is in a high-pressure hydrogen environment for a long time and is easily damaged due to high pressure. In addition, the temperature sensor probe is in direct contact with hydrogen for a long time and is easily damaged.

[0007] 2. Its cylinder valve structure is compact and contains many components, and it is impossible to introduce a new structure by opening a new hole inside the cylinder valve, resulting in poor functional expandability.

[0008] 3. Its cylinder valve discharge diameter is small and cannot meet large-flow discharge.

[0009] Therefore, it is necessary to improve such a structure to overcome the above defects. Summary of the Invention

[0010] The purpose of the present utility model is to provide a temperature-driven safety relief device to solve the problems existing in the prior art.

[0011] The above technical purpose of the present utility model is achieved through the following technical solutions:

[0012] A temperature-driven safety relief device includes a valve body. A through-channel is provided inside the valve body. A TPRD valve seat is provided at one end of the through-channel. A heat-sensitive glass bulb is arranged inside the TPRD valve seat. An armored temperature sensor is provided at the other end of the through-channel. A connecting rod is arranged inside the through-channel. Two ends of the connecting rod are respectively in contact with the heat-sensitive glass bulb and the armored temperature sensor. A retaining ring and a radial sealing ring are arranged on the connecting rod. The side of the retaining ring and the radial sealing ring close to the heat-sensitive glass bulb is an atmospheric pressure area, and the end of the retaining ring and the radial sealing ring close to the armored temperature sensor is a pressurized medium area. The armored temperature sensor pushes the connecting rod to closely contact the heat-sensitive glass bulb under the action of the pressurized medium area.

[0013] Further, the inner surface of the through-channel at one end of the valve body is provided with internal threads, and the outer surface of the TPRD valve seat is provided with external threads, and the TPRD valve seat is connected and fixed to one end of the valve body through the cooperation of the external threads and the internal threads.

[0014] Further, the armored temperature sensor includes a stainless steel sleeve and a temperature-sensing element. The stainless steel sleeve is movably arranged in the through-channel and can move along the through-channel under the action of the pressurized medium area. The temperature-sensing element is arranged inside the stainless steel sleeve and is used to monitor the temperature of the pressurized medium area. The output end of the temperature-sensing element is connected with a wire harness, and the wire harness transmits the monitored temperature to the hydrogen controller through the internal channel of the connecting rod.

[0015] Further, a sealing section is arranged inside the through-channel. The retaining ring and the radial sealing ring are arranged at the connecting rod located in the sealing section. The inner diameter of the sealing section is smaller than the inner diameter of other positions of the through-channel. A discharge inlet is provided in the atmospheric pressure area on the side of the sealing section. One end of the discharge inlet is communicated with the through-channel, and the other end of the discharge inlet is communicated with a large-diameter discharge outlet.

[0016] Further, an end face sealing ring is arranged at the connection between the connecting rod and the armored temperature sensor, which is used to prevent the pressurized medium from entering the inside of the armored temperature sensor.

[0017] In summary, the present utility model has the following beneficial effects:

[0018] During normal use, it plays a sealing role due to the action of the medium pressure. In abnormal situations, the pressure can drive the overall structure to displace, and the gas medium can also be discharged normally, which can solve the drawbacks that conventional temperature probes cannot directly contact hydrogen, cannot withstand high pressure, and cannot be used for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the safety relief device described in the present utility model.

[0020] Figure 2 is a schematic diagram of the safety relief device described in the present utility model.

[0021] Figure 3 is an internal view of the safety relief device described in the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to make the technical means, creative features, achieved purposes and effects of the present utility model easy to understand, the present utility model will be further described below in conjunction with the drawings and specific embodiments.

[0023] As Figures 1 to 3 shown, a temperature-driven safety relief device proposed by the present utility model includes a valve body 6. A through-channel is provided inside the valve body 6. A TPRD valve seat 1 is provided at one end of the through-channel. A temperature-sensitive glass ball 2 is arranged inside the TPRD valve seat 1. An armored temperature sensor 9 is provided at the other end of the through-channel. A connecting rod 3 is arranged inside the through-channel. The two ends of the connecting rod 3 are respectively in contact with the temperature-sensitive glass ball 2 and the armored temperature sensor 9. A retaining ring 4 and a radial sealing ring 5 are arranged on the connecting rod 3. The side of the retaining ring 4 and the radial sealing ring 5 close to the temperature-sensitive glass ball 2 is an atmospheric pressure area, and the end of the retaining ring 4 and the radial sealing ring 5 close to the armored temperature sensor 9 is a pressurized medium area. The armored temperature sensor 9 pushes the connecting rod 3 to closely contact the temperature-sensitive glass ball 2 under the action of the pressurized medium area.

[0024] The inner surface of the through-channel at one end of the valve body 6 is provided with an internal thread, and the outer surface of the TPRD valve seat 1 is provided with an external thread, and is connected and fixed to one end of the valve body 6 through the cooperation of the external thread and the internal thread.

[0025] The armored temperature sensor 9 includes a stainless steel sleeve and a temperature-sensing element. The stainless steel sleeve is movably arranged in the through-channel and can move along the through-channel under the action of the pressurized medium area. The temperature-sensing element is arranged inside the stainless steel sleeve and is used to monitor the temperature of the pressurized medium area. The output end of the temperature-sensing element is connected with a wire harness 7, and the wire harness 7 transmits the monitored temperature to the hydrogen controller through the internal channel of the connecting rod 3.

[0026] A sealing section 10 is provided inside the through-channel, and a retaining ring 4 and a radial sealing ring 5 are provided at the connecting rod 3 located at the sealing section 10. The inner diameter of the sealing section 10 is smaller than the inner diameter of other positions of the through-channel; a discharge inlet 11 is provided in the normal pressure area on the side of the sealing section 10, one end of the discharge inlet 11 is connected to the through-channel, and the other end of the discharge inlet 11 is connected to a large-diameter discharge outlet 12.

[0027] An end face sealing ring 8 is provided at the connection between the connecting rod 3 and the armored temperature sensor 9 , which is used to prevent pressurized medium from entering the interior of the armored temperature sensor 9 .

[0028] The working principle of this utility model is as follows:

[0029] After installing the safety pressure relief device with the above structure at the port of the gas cylinder and tightening the TPRD valve seat 1, the armored temperature sensor 9, under the action of the pressurized medium, pushes the connecting rod 3 against the temperature-sensitive glass bulb 2, sealing the entire device. The output end of the armored temperature sensor 9 is connected to the wiring harness 7, which transmits the monitored temperature to the hydrogen controller through the internal channel of the connecting rod 3.

[0030] Under abnormal conditions (temperatures exceeding 110±5°C), the medium inside the temperature-sensing glass bulb 2 expands due to heat, causing the entire bulb 2 to rupture. The cylinder's gas pressure causes the connecting rod 3 to move upward, driving the armored temperature sensor 9 upward as a whole, ultimately causing the upper end face of the connecting rod 3 to directly contact the TPRD valve seat 1. During this process, the retaining ring 4 and radial sealing ring 5 move upward along with the connecting rod 3 and disengage from the sealing section 10, losing their seal with the retaining ring 4, radial sealing ring 5, and the inner wall of the through-passage. The gas inside the cylinder flows out of the through-passage at the discharge inlet 11 and ultimately into the atmosphere through a pipeline connected to the large-diameter discharge outlet 12.

[0031] In this document, the directions or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "vertical", and "horizontal" are based on the directions or positional relationships shown in the accompanying drawings and are only for the clarity of the technical solution and the convenience of description. Therefore, they should not be understood as limitations on the present invention.

[0032] As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion of elements other than the listed elements and may also include additional elements not specifically listed.

[0033] The foregoing has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above-mentioned embodiments. What is described in the above-mentioned embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A temperature-driven safety relief device, characterized in that, It includes a valve body (6) with a through-channel opened inside. At one end of the through-channel, there is a TPRD valve seat (1). A heat-sensitive glass bulb (2) is arranged inside the TPRD valve seat (1). At the other end of the through-channel, there is an armored temperature sensor (9). An adjusting rod (3) is arranged inside the through-channel. Two ends of the adjusting rod (3) are respectively in contact with the heat-sensitive glass bulb (2) and the armored temperature sensor (9). A retaining ring (4) and a radial sealing ring (5) are arranged on the adjusting rod (3). The side of the retaining ring (4) and the radial sealing ring (5) close to the heat-sensitive glass bulb (2) is an atmospheric pressure area, and the end of the retaining ring (4) and the radial sealing ring (5) close to the armored temperature sensor (9) is a pressurized medium area. The armored temperature sensor (9) pushes the adjusting rod (3) to closely contact the heat-sensitive glass bulb (2) under the action of the pressurized medium area.

2. The temperature-driven safety relief device according to claim 1, characterized in that The inner surface of the through-channel at one end of the valve body (6) is provided with internal threads, and the outer surface of the TPRD valve seat (1) is provided with external threads. The TPRD valve seat (1) is connected and fixed to one end of the valve body (6) by the cooperation of the external threads and the internal threads.

3. The temperature-driven safety pressure relief device according to claim 1, characterized in that, The armored temperature sensor (9) includes a stainless steel sleeve and a temperature sensing element. The stainless steel sleeve is movably arranged in the through-channel and can move along the through-channel under the action of the pressurized medium area. The temperature sensing element is arranged inside the stainless steel sleeve and is used to monitor the temperature of the pressurized medium area. The output end of the temperature sensing element is connected with a wire harness (7). The wire harness (7) transmits the monitored temperature to a hydrogen controller through the internal channel of the adjusting rod (3).

4. A temperature-driven safety relief device according to claim 1, characterized in that, A sealing section (10) is arranged inside the through-channel. The retaining ring (4) and the radial sealing ring (5) are arranged at the adjusting rod (3) located in the sealing section (10). The inner diameter of the sealing section (10) is smaller than the inner diameter of other positions of the through-channel. A discharge inlet (11) is arranged in the atmospheric pressure area on the side of the sealing section (10). One end of the discharge inlet (11) is communicated with the through-channel, and the other end of the discharge inlet (11) is communicated with a large-diameter discharge outlet (12).

5. The temperature-driven safety relief device according to claim 1, characterized in that, An end face sealing ring (8) is arranged at the connection between the adjusting rod (3) and the armored temperature sensor (9), which is used to prevent the pressurized medium from entering the inside of the armored temperature sensor (9).

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