High-integration degree bottle valve for high-pressure hydrogen storage cylinder

Abstract

The present application belongs to the technical field of valve, and particularly relates to a high-integration degree bottle valve for high-pressure hydrogen storage cylinder. The present application comprises a main valve group at the cylinder mouth of the high-pressure hydrogen storage cylinder, which comprises a hydrogen supply pipeline, a hydrogen charging pipeline and a pressure relief pipeline with a safety valve SV; a common sub-pipeline of the hydrogen supply pipeline and the hydrogen charging pipeline is formed by the pipelines with a flow limiting valve TV and a cut-off valve V1, wherein: the hydrogen supply pipeline comprises the flow limiting valve TV, the cut-off valve V1, a hydrogen supply switch valve V2 and a hydrogen supply port arranged in sequence along the medium flow direction, and the inlet of the flow limiting valve TV is communicated with the high-pressure hydrogen storage cylinder; the hydrogen charging pipeline comprises a hydrogen charging port, a check valve CV, the cut-off valve V1 and the flow limiting valve TV arranged in sequence along the medium flow direction, and the medium flow direction of the check valve CV is the same as the medium flow direction of the hydrogen charging pipeline during operation. The present application has the characteristics of compact structure and convenient and flexible use, and can continuously and effectively ensure the high safety and high reliability of the hydrogen supply system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of valves, and particularly relates to a high-integration degree bottle valve for a high-pressure hydrogen storage cylinder. BACKGROUND

[0002] In a predictable period of time, hydrogen fuel vehicles will still mainly use high-pressure gaseous hydrogen storage as the main hydrogen storage mode, and will generally use high-pressure hydrogen storage cylinders with small heavy capacity and high pressure-bearing capacity for hydrogen storage. In order to meet the high endurance capability of hydrogen fuel vehicles, the filling hydrogen pressure in the high-pressure hydrogen storage cylinder is as high as 35-70 MPa. Due to the problems of high pressure, self-ignition and easy explosion of hydrogen, the safe and efficient use of hydrogen in the high-pressure hydrogen storage cylinder as a vehicle-mounted energy storage component obviously cannot do without a high-integration degree bottle valve and a corresponding hydrogen supply control system; the performance of the bottle valve is directly related to whether the entire hydrogen supply system can normally or efficiently work.

[0003] At present, the 70MPa-level bottle valve technology is not mature, there are few products, and there are many risk hidden dangers in functionality, safety, reliability and the like; for example, the layout of various functional components is unreasonable, the safety integrity level is low, and the like; the solution to the safety hidden danger of such a bottle valve also depends on auxiliary components, such as the design in Chinese Patent No. CN110345380A, which uses a gas manifold to support the hydrogen storage container to improve the safety level, and the like, so it can be seen that there is little improvement in the safety structure of the 70MPa-level bottle valve itself. Therefore, in order to steadily promote the industrialization process of hydrogen fuel cell vehicles and meet the application requirements of the 70MPa-level hydrogen storage and supply system, it is urgent to develop a bottle valve product with comprehensive functions, strict safety logic and high reliability. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a high-integration degree bottle valve for a high-pressure hydrogen storage cylinder, which has the characteristics of compact structure and convenient and flexible use, and can continuously and effectively ensure the high safety and high reliability of the hydrogen supply system.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] A high-integration degree bottle valve for a high-pressure hydrogen storage cylinder, characterized in that: a main valve group is located at the bottle mouth of the high-pressure hydrogen storage cylinder, and the main valve group comprises a hydrogen supply pipeline, a hydrogen filling pipeline and a pressure relief pipeline with a safety valve SV; the pipeline where a flow limiting valve TV and a cut-off valve V1 are located is a common sub-pipeline of the hydrogen supply pipeline and the hydrogen filling pipeline, wherein:

[0007] The hydrogen supply pipeline comprises, in sequence along the medium flow direction, the flow limiting valve TV, the cut-off valve V1, a hydrogen supply on-off valve V2 and a hydrogen supply port, and the inlet of the flow limiting valve TV is communicated with the high-pressure hydrogen storage cylinder;

[0008] The hydrogen filling pipeline comprises a hydrogen filling port, a check valve CV, a cut-off valve V1 and a flow limiting valve TV arranged in sequence along the medium flow direction, and the medium flow direction of the check valve CV is the same as the medium flow direction of the hydrogen filling pipeline during operation.

[0009] Preferably, the hydrogen filling nozzle is located at the end of the pipeline for connecting the high-pressure hydrogen storage cylinder, and the jetting direction of the hydrogen filling nozzle points to the cavity of the high-pressure hydrogen storage cylinder; the hydrogen filling nozzle comprises a closed nozzle tube, two or more groups of nozzle holes are arranged on the front end surface of the nozzle tube, the axis of each nozzle hole intersects with the axis of the nozzle tube, and each nozzle hole extends from the front end to the rear end of the nozzle tube and converges at the nozzle tube cavity; in the cross section perpendicular to the nozzle tube axis, each nozzle hole forms a vortex structure.

[0010] Preferably, the hydrogen filling nozzle is located at the end of the pipeline for connecting the high-pressure hydrogen storage cylinder, and the jetting direction of the hydrogen filling nozzle points to the cavity of the high-pressure hydrogen storage cylinder; the hydrogen filling nozzle comprises a closed nozzle tube, two or more groups of nozzle holes are arranged on the front end surface of the nozzle tube, the axis of each nozzle hole extends from the front end to the rear end of the nozzle tube and intersects with the axis of the nozzle tube at the same point.

[0011] Preferably, the flow limiting valve TV comprises a flow limiting valve body and a flow limiting valve core in the flow limiting valve body, and the design method of the flow limiting valve TV is as follows:

[0012] S1, a three-dimensional structure model of the flow limiting valve TV is established without considering the limiting structure of the flow limiting valve core according to the given design parameters;

[0013] S2, a flow field structure model of the flow limiting valve TV is established according to the three-dimensional structure model; the flow capacity of the flow limiting valve TV under each set flow limiting valve core stroke condition is compared and judged to determine the flow limiting valve core stroke L0 that meets the design flow capacity, and the rated stroke L of the flow limiting valve core is obtained by multiplying L0 by 120%. R ;

[0014] S3, the stress state of the flow limiting valve TV under each set flow limiting valve core stroke condition is analyzed by using analysis software according to the given flow limiting trigger condition and the flow field structure model, and a function of the comprehensive stress state of the flow limiting valve core changing with the flow limiting valve core stroke is established by fitting the test data under each flow limiting valve core stroke condition, that is:

[0015] F J =f(X)

[0016] In the formula:

[0017] X is the actual stroke of the flow limiting valve core;

[0018] F JThe comprehensive stress of the flow-limiting valve core under the action of the medium;

[0019] S4, a function of the stress change of the spring with the stroke of the flow-limiting valve core is established according to the spring mounting space reserved at the flow-limiting valve TV, that is,

[0020] F S =K*[B+(L R -X)]

[0021] In the formula,

[0022] B is the compression amount of the spring under the installation condition;

[0023] F S is the stress of the flow-limiting valve core under the action of the spring;

[0024] K is the stiffness coefficient of the spring;

[0025] L R is the rated stroke of the flow-limiting valve core;

[0026] When the actual stroke of the flow-limiting valve core is located in the range of (0, L0], F S <F J ; when the actual stroke of the flow-limiting valve core is located in the range of (L0, L R ], F S ≥F J .

[0027] Preferably, after the function of the stress change of the spring with the stroke of the flow-limiting valve core is established, whether the designed flow-limiting valve TV can meet the flow-limiting action requirement is verified by test according to the given flow-limiting trigger condition; if not, the spring is replaced by reducing the stiffness coefficient K by 5% each time, and steps S2-S5 are repeated until the design requirement is met.

[0028] Preferably, the analysis software is a CFD software.

[0029] Preferably, the flow-limiting valve core is arranged with a small flow hole in the axial direction, and a large flow hole is arranged in the radial direction of the flow-limiting valve core, and the medium flow of the large flow hole is greater than that of the small flow hole.

[0030] Preferably, the temperature sensor T1 located in the high-pressure hydrogen storage cylinder, the hydrogen supply switch valve V2 is a pilot type electromagnetic valve, and the circuit plug of the temperature sensor T1 is integrally injection molded with the circuit plug of the hydrogen supply switch valve V2.

[0031] Preferably, it further comprises a pressure sensor P1 for monitoring the pressure of the pressure relief pipeline and a diffuser valve BV connected to the pressure relief pipeline.

[0032] Preferably, the hydrogen supply filter and the hydrogen charging filter are further included, the hydrogen charging filter is arranged on a pipeline between the hydrogen charging port and the check valve CV, and the hydrogen supply filter is arranged on a pipeline between the flow limiting valve TV and the high-pressure hydrogen storage cylinder.

[0033] The present application has the following advantages:

[0034] 1) In the hydrogen charging pipeline of the present application, a group of independent sub-pipelines is formed from the hydrogen charging port, the hydrogen charging filter to the check valve CV along the medium flow direction; another group of independent sub-pipelines is formed from the hydrogen supply switch valve V2 as the electromagnetic valve to the hydrogen supply port along the medium flow direction in the hydrogen supply pipeline; other overlapping parts outside the two independent sub-pipelines are common sub-pipelines, including the hydrogen supply filter, the flow limiting valve TV and the cut-off valve V1. Through this design, the process setting is more secure while ensuring the simplicity of the system, and the reliability is also higher. In the emergency working condition, the entire hydrogen supply pipeline and the hydrogen charging pipeline can be cut off by directly closing the cut-off valve V1, and the risk of medium leakage is avoided.

[0035] In addition, when the medium is over-temperature / over-pressure, the medium can be discharged to the downstream through the independent pressure relief pipeline to the pressure relief port, thereby avoiding the explosion of the high-pressure hydrogen storage cylinder. During hydrogen charging, the medium enters the high-pressure hydrogen storage cylinder through the hydrogen charging pipeline to continuously pressurize to reach the target value, at this time, the electromagnetic valve in the hydrogen supply pipeline is in the closed state, and the medium will not impact the downstream pipeline of the electromagnetic valve in the hydrogen supply pipeline; during hydrogen supply, the medium passes through the hydrogen supply pipeline to the hydrogen supply port to supply the downstream for use, at this time, the check valve CV in the hydrogen charging pipeline is in the closed state, and the medium will not leak to the hydrogen charging port. Therefore, the setting of each functional component in the present application meets the clear, safe and rigorous logic of the functions of hydrogen charging, hydrogen supply and safety pressure relief.

[0036] In summary, the present application has the characteristics of compact structure and convenient and flexible use, and can continuously and effectively ensure the high safety and high reliability of the hydrogen supply system.

[0037] 2) The hydrogen filling nozzle arranged at the end of the common sub-pipeline is another core point of the present application. Since the flow rate is relatively high during hydrogen filling, the medium flows into the high-pressure hydrogen storage cylinder through the hydrogen filling pipeline; in this way, on the one hand, due to the existence of the hydrogen filling nozzle, whether the nozzle hole is spiral or symmetrically bifurcated, the medium will spiral around the high-pressure hydrogen storage cylinder when flowing in, so that the medium in the cylinder can be quickly and uniformly mixed, avoiding the influence of uneven temperature distribution, and further improving the working safety and reliability. In other words, for the symmetrically bifurcated nozzle hole, when hydrogen is filled, the medium flows into the cylinder through the nozzle, at this time the velocity vector of the medium can be decomposed into axial and radial components, that is, the medium forms a stirring airflow in the cylinder through multiple nozzle holes, thereby quickly and uniformly mixing; for the spiral nozzle hole, when hydrogen is filled, the medium flows into the cylinder through the nozzle, at this time the velocity vector of the medium can be decomposed into axial, radial and circumferential components, then the medium can form a spiral stirring airflow around the cylinder through multiple nozzle holes, thereby more efficiently and uniformly mixing, ultimately eliminating the influence of uneven temperature, further improving the working safety and reliability. On the other hand, the special point of the hydrogen filling nozzle is that it is skillfully arranged at the end of the common sub-pipeline, breaking the conventional inherent concept that "filling and discharging cannot be compatible", taking advantage of the relatively low flow rate during hydrogen supply, thereby ensuring the feasibility of the common sub-pipeline, simplifying the pipeline structure, and ensuring that the nozzle hole arrangement will not have a throttling effect on the entire hydrogen supply pipeline, achieving multiple goals at once.

[0038] 3) The setting of the flow limiting valve TV, under normal working conditions, the flow limiting valve TV can normally transmit the medium through the large flow hole; and under emergency working conditions, when the hydrogen supply pipeline or the hydrogen filling pipeline has an accident and the medium suddenly leaks in large quantities, the flow limiting valve core can be quickly closed under the driving of large pressure difference flow, and the medium can only slowly leak through the small flow hole; thus, it can effectively avoid more serious secondary accidents caused by large leakage of the medium.

[0039] 4) The electromagnetic valve in the present application, i.e. the hydrogen supply on-off valve V2, adopts a flow-closing type structure of a pilot type, and the electromagnetic valve of the pilot type requires a smaller electromagnetic force to open, which is beneficial to the miniaturization and light weight of the integrated cylinder valve. The greater the medium pressure, the more conducive the flow-closing type structure is to sealing, and the effect is remarkable.

[0040] 5) When hydrogen is supplied, the medium needs to pass through the gas supply filter before being supplied to the downstream; if there are impurities in the high-pressure hydrogen storage cylinder, the impurities in the medium can be effectively filtered through the gas supply filter, avoiding the influence of the impurities on the pipeline equipment. When hydrogen is filled, the medium also needs to pass through the filling filter first, and then pass through the hydrogen filling pipeline into the high-pressure hydrogen storage cylinder; if there are impurities outside the hydrogen filling, the impurities in the medium can also be effectively filtered, avoiding the influence of the impurities on the pipeline equipment.

[0041] 6) The pressure sensor P1 in this invention is directly connected to the inside of the high-pressure hydrogen storage cylinder through a pressure relief pipeline. The pressure detection pipeline is simple and direct, realizing real-time online monitoring of the internal pressure of the high-pressure hydrogen storage cylinder, and the risk of pressure monitoring failure is low.

[0042] 7) In actual design, the safety valve SV in this invention can simultaneously have two functions: overpressure relief and overtemperature relief. That is, regardless of whether an overpressure accident or fire accident occurs in the hydrogen storage / supply system, the hydrogen in the high-pressure hydrogen storage cylinder can be released in time to ensure that the high-pressure hydrogen storage cylinder does not explode or other dangerous situations. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the pipeline layout of the present invention;

[0044] Figure 2 and Figure 3 A schematic diagram of the hydrogen charging nozzle;

[0045] Figure 4 and Figure 5 This is a schematic diagram of two embodiments of the safety valve SV.

[0046] The actual correspondence between the reference numerals and component names in this invention is as follows:

[0047] 10-High-pressure hydrogen storage cylinder;

[0048] 21-Hydrogen supply port; 22-Hydrogen charging port;

[0049] 30-Hydrogen charging nozzle; 31-Nozzle; 32-Nozzle orifice; 33-Central flow channel;

[0050] 40 - Inflation filter; 50 - Air supply filter;

[0051] 61-Safety valve body; 62-Axial guide cavity; 63-Core; 64-Safety valve core; 65-End cap; 66-Temperature sensing glass bulb; 67-Fuse plug; 68-Top block; 69-Bending pin. Detailed Implementation

[0052] For ease of understanding, this section combines... Figures 1-5 The specific structure and operation of the present invention are further described below:

[0053] Example 1:

[0054] This invention includes a main valve assembly, and a flow-limiting valve TV, a manually controlled shut-off valve V1, a solenoid valve constituting a hydrogen supply switching valve V2, a check valve CV, and a safety valve SV, all mounted on the main valve assembly. The assembly states of each component are as follows: Figure 1 As shown.

[0055] When the application is in the hydrogen filling state, the hydrogen gas as the medium is filled into the high-pressure hydrogen storage cylinder 10 from the pressurized end such as a hydrogen filling machine through the hydrogen filling pipeline, i.e., the medium flows into the high-pressure hydrogen storage cylinder 10 in turn through the hydrogen filling port 22, the gas filling filter 40, the check valve CV, the cut-off valve V1, the flow limiting valve TV, and the gas supply filter 50. In this state, along the current medium flow direction, the check valve CV is in the opening state under the action of the medium, the compression spring of the check valve CV core is in the opening state; the cut-off valve V1 is in the normal opening state; the flow limiting valve TV core is in the opening state under the action of its own spring, and the medium flow direction is also conducive to the opening of the flow limiting valve TV, and the medium flows through the large flow hole.

[0056] When the application is in the hydrogen supply state, the medium is supplied from the high-pressure hydrogen storage cylinder 10 to the downstream use end such as a fuel cell stack through the hydrogen supply pipeline, i.e., the medium flows from the high-pressure hydrogen storage cylinder 10 in turn through the gas supply filter 50, the flow limiting valve TV, the cut-off valve V1, the hydrogen supply on-off valve V2, and the hydrogen supply port 21 to the downstream. In this state, along the current medium flow direction, due to the small pressure difference / flow rate of the hydrogen supply, the medium acting on the flow limiting valve core has a small closing force, and the flow limiting valve core still remains in the opening state under the joint action of the corresponding spring and the medium; the cut-off valve V1 is in the normal opening state; the electromagnetic valve is energized and in the opening state.

[0057] When the application is in the safe pressure relief state, the medium is released from the high-pressure hydrogen storage cylinder 10 to the downstream, such as directly discharged to the atmosphere, through the pressure relief pipeline, i.e., the medium flows from the high-pressure hydrogen storage cylinder 10 in turn through the safety valve SV and the pressure relief port to the downstream. In this state, along the current medium flow direction, when the medium overpressure or overtemperature occurs, the sensitive element of the safety valve SV will fail, and then the safety valve core can be opened under the action of the medium pressure, and the medium flows from the inside of the safety valve SV to the pressure relief port and is discharged to the downstream.

[0058] When the application is in the hydrogen supply state and the system has an accident such as a broken hydrogen supply downstream pipeline, which causes the risk of a large amount of medium leakage, due to the large pressure difference / flow rate of the medium flow in the accident state, the medium acting force on the flow limiting valve core is greater than the spring force, and the flow limiting valve core is in the closing state under the joint action of its own spring and the medium, and the medium can only be slightly leaked to the downstream through the small flow hole.

[0059] In addition, in the hydrogen charging pipeline, along the medium flow direction, from upstream of the cut-off valve V1, the cut-off valve V1, the flow limiting valve TV, the gas supply filter 50 to the high-pressure hydrogen storage cylinder 10; in the hydrogen supply pipeline, along the medium flow direction, from the high-pressure hydrogen storage cylinder 10, the gas supply filter 50, the flow limiting valve TV, the cut-off valve V1 to downstream of the cut-off valve V1; at this time, the hydrogen charging pipeline and the hydrogen supply pipeline obviously have a shared sub-pipeline. When an emergency occurs and the high-pressure hydrogen storage cylinder 10 needs to be cut off by the application, the cut-off valve V1 in the shared sub-pipeline can be closed to achieve this.

[0060] The application also comprises a temperature sensor T1, which is an NTC thermistor, i.e., a negative temperature coefficient thermistor, and the outer layer is a metal shell. The metal shell is threadedly fastened with the transition sleeve in a sealed manner, the transition sleeve is threadedly fastened with the main valve group in a sealed manner, and the temperature sensor T1 is installed inside the high-pressure hydrogen storage cylinder 10, solving the sealing problem of the temperature detection pipeline, i.e., the high-pressure medium in the high-pressure hydrogen storage cylinder 10 cannot leak out through the connection between the temperature sensor T1 and the transition sleeve. Further, the connection end of the transition sleeve and the metal shell of the temperature sensor T1 can be right-handed threads, and the connection end with the main valve group can be left-handed threads; or the connection end of the transition sleeve and the metal shell of the temperature sensor T1 can be left-handed threads, and the connection end with the main valve group can be right-handed threads. The electrical circuit of the temperature sensor T1 passes through the internal pipeline of the transition sleeve and the independent pipeline of the main valve group to the electromagnetic valve coil installation position. Because the threads at both ends of the transition sleeve are of different directions, during installation, only by rotating the transition sleeve, the fastening connection of the temperature sensor T1, the transition sleeve and the main valve group can be achieved, avoiding damage to the circuit connection caused by multiple rotations of the temperature sensor T1.

[0061] The application also comprises a pressure sensor P1, and a corresponding installation port is arranged, which is arranged outside the high-pressure hydrogen storage cylinder 10 and directly connected with the pressure relief pipeline upstream of the safety valve SV. The pressure detection pipeline directly reaches the inside of the high-pressure hydrogen storage cylinder 10, realizing real-time online monitoring of the internal pressure of the high-pressure hydrogen storage cylinder 10, and the risk of pressure monitoring failure is low.

[0062] The application also comprises a bleeder valve BV, which is also directly connected with the pressure relief pipeline upstream of the safety valve SV. When the high-pressure hydrogen storage cylinder 10 installed in the system needs to release pressure, the bleeder valve BV can be connected through a special tool, so as to realize the release of the medium.

[0063] Example 2:

[0064] On the basis of the structure of the embodiment, the application also comprises a hydrogen charging nozzle 30 arranged in the shared sub-pipeline of the hydrogen charging pipeline and the hydrogen supply pipeline.

[0065] The hydrogen filling nozzle 30 is arranged at the pipeline end of the hydrogen filling pipeline, or the pipeline start end of the hydrogen supply pipeline. That is, along the medium flow direction during hydrogen filling, the medium flows through the cut-off valve V1, the flow limiting valve TV, the gas supply filter 50, the hydrogen filling nozzle 30 to the high-pressure hydrogen storage cylinder 10; along the medium flow direction during hydrogen supply, the medium flows from the high-pressure hydrogen storage cylinder 10 to the hydrogen filling nozzle 30, the gas supply filter 50, the flow limiting valve TV to the cut-off valve V1. Referring to Figures 2-3 As shown, along the medium flow direction during hydrogen filling, the medium flows into the central flow passage 33 of the hydrogen filling nozzle 30, that is, the lumen of the nozzle 31, and is dispersedly sprayed into the high-pressure hydrogen storage cylinder 10 through the plurality of nozzle holes 32 uniformly distributed around the axis of the central flow passage 33. The included angle between the axis of the nozzle hole 32 and the axis of the central flow passage 33 is an acute angle along the medium flow direction, and is recommended to be 15°-30°.

[0066] During hydrogen filling, the flow rate is relatively high, and the medium flows to the hydrogen filling nozzle 30 through the hydrogen filling pipeline, and flows into the high-pressure hydrogen storage cylinder 10 through the plurality of dispersed nozzle holes 32. Due to the specific design of the nozzle hole 32, the gas flows into the cylinder and spirally stirs around the cylinder, so that the medium in the cylinder is quickly mixed and uniform, and the influence of uneven temperature distribution is avoided. During hydrogen supply, the flow rate is relatively low, and the nozzle hole 32 has no throttling effect on the flow.

[0067] Further, the size of the hydrogen filling port 22 and the hydrogen supply port 21 can also be considered to be different, so that the present application can effectively prevent the occurrence of misconnection accidents when the hydrogen storage / supply system is assembled.

[0068] The electromagnetic valve in the hydrogen supply pipeline is a pilot type structure, and is a flow-closed type. When designing, the electromagnetic valve can include an electromagnetic coil, a valve cover, a switch spring, a pilot armature valve core and a main valve core. When the electromagnetic valve is powered off, the electromagnetic coil does not generate electromagnetic force. Due to the flow-closed type of the electromagnetic valve, under the action of the medium force and the spring force, the pilot armature valve core and the main valve core are in a closed state; when the electromagnetic valve is powered on, the pilot armature valve core is under the action of the electromagnetic force generated by the electromagnetic coil, that is, the electromagnetic force is greater than the force of the medium on the pilot armature valve core and part of the spring force, so that the pilot armature valve core compresses the switch spring to open a part of the stroke, and the medium flows to the downstream through the seal between the pilot armature valve core and the main valve core, so that the main valve core reaches a balanced state between the upstream and the downstream; at this time, the pilot armature valve core continues to compress the switch spring to open the full stroke under the action of the electromagnetic force, and drives the main valve core to open. The electromagnetic valve adopts a pilot type structure, and the required opening electromagnetic force is small, which is beneficial to the miniaturization and light weight of the present application. The greater the medium pressure, the more conducive to sealing the flow-closed type structure is.

[0069] The temperature sensor T1 of the present application is connected to the electromagnetic coil, and the circuit plug connector of the integrated temperature sensor T1 and the electromagnetic valve can be injection molded on the electromagnetic coil, the electrical circuit layout is simple, the injection molded plug connector can ensure the reliability of the circuit connection, and the risk of damage during installation, debugging and other links is reduced.

[0070] Embodiment 3:

[0071] On the basis of the above structure, the present application further comprises a safety valve SV. The safety valve SV can realize both overpressure relief and overtemperature relief functions, as shown in Figures 4-5

[0072] Figure 4 In one of the embodiments of the safety valve SV, the safety valve SV comprises a safety valve body 61 and an axial guide cavity 62 located in the safety valve body 61, and the bottom end of the axial guide cavity 62 is communicated with the high-pressure hydrogen storage cylinder 10. A valve assembly is arranged in the axial guide cavity 62, and the valve assembly comprises a core body 63 coaxially fixed in the axial guide cavity 62, and a safety valve core 64 coaxially and slidingly sealed in the sleeve cavity of the core body 63. The core body 63 is radially arranged with a flow channel hole, the flow channel hole penetrates the safety valve body 61 and is communicated with a pressure relief port; an end cover 65 is sealingly mounted at the top end of the core body 63, and the two ends of a temperature sensing glass bulb 66 located in the sleeve cavity of the core body 63 are abutted against the adjacent ends of the end cover 65 and the safety valve core 64, respectively. A retaining ring can be sleeved outside the temperature sensing glass bulb 66. In operation, the safety valve core 64 directly bears the medium pressure, and when the medium pressure reaches the overpressure relief design pressure, since the product of the pressure p and the valve core acting area S is greater than the temperature sensing glass bulb 66 breaking load Fp, that is, p×S>Fp, the force formed by the medium pressure borne by the safety valve core 64 is transmitted to the temperature sensing glass bulb 66, the temperature sensing glass bulb 66 breaks, the safety valve core 64 is opened under the action of the medium pressure, and the medium flows from the pipeline between the safety valve core 64, the core body 63 and the safety valve body 61 to the pressure relief port for discharge.

[0073] When the medium temperature reaches the overtemperature relief design temperature, since the temperature sensing glass bulb 66 reaches the specified temperature and breaks, the safety valve core 64 is opened under the action of the medium pressure, and the medium still flows from the pipeline between the safety valve core 64, the core body 63 and the safety valve body 61 to the pressure relief port for discharge.

[0074] The present application ingeniously utilizes two attributes of the temperature sensing glass bulb 66, i.e. temperature sensing breaking and load breaking, and accurately matches the breaking load value of the temperature sensing glass bulb 66 by the pressure bearing area of the safety valve core 64 and the design overpressure relief pressure, so as to realize that the safety valve SV simultaneously has both overpressure relief and overtemperature relief functions, and further improves the safety.

[0075] Figure 5 Another embodiment of the safety valve SV can also realize both overpressure relief and overtemperature relief functions. ​

[0076] As shown in Figure 5 The safety valve SV comprises a safety valve body 61 and an axial guide cavity 62 in the safety valve body 61, the axial guide cavity 62 is communicated with the high-pressure hydrogen cylinder 10 at the bottom end; a valve assembly is arranged in the axial guide cavity 62, the valve assembly comprises a core body 63 coaxially fixed in the axial guide cavity 62, a safety valve core 64 is coaxially and slidingly sealed in the sleeve cavity of the core body 63; the flow channel hole is radially arranged in the core body 63, the flow channel hole penetrates the safety valve body 61 and is communicated with the pressure relief port; at this time, the aforementioned end cover 65 is a fusible plug, and a top block 68 is arranged below the fusible plug, and the two ends of the bent pin 67 in the sleeve cavity of the core body 63 are respectively abutted against the top block 68 and the adjacent end of the safety valve core 64.

[0077] When the medium pressure reaches the overpressure relief design pressure, the force formed by the medium pressure borne by the safety valve core 64 is transmitted to the bent pin 67, the bent pin 67 is bent under the force, the safety valve core 64 is opened under the action of the medium pressure, and the medium flows from the pipeline between the safety valve core 64, the core body 63 and the safety valve body 61 to the pressure relief port for discharge. When the medium temperature reaches the over-temperature relief design temperature, the fusible plug is melted, the medium pressure borne by the safety valve core 64 is transmitted to the fusible plug through the bent pin 67, so that the fusible plug is extruded, the safety valve core 64 is opened under the action of the medium pressure, and the medium flows from the pipeline between the safety valve core 64, the core body 63 and the safety valve body 61 to the pressure relief port for discharge.

[0078] The present application ingeniously combines the function attributes of the bent pin 67 and the fusible plug, and sets the fusible plug at the force-external side end of the bent pin 67, thereby avoiding the risk of easy blockage when the fusible alloy melts during over-temperature relief, that is, avoiding the risk of affecting the safety relief. The organic combination of the function attributes of the bent pin 67 and the fusible plug enables the safety valve SV to simultaneously have the functions of overpressure relief and over-temperature relief, and further improves the safety.

[0079] Of course, for those skilled in the art, the present application is not limited to the details of the above exemplary embodiments, but also includes the same or similar structures that can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0080] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

[0081] The technologies, shapes, and structural parts not described in detail in the present application are well-known technologies.

Claims

1. A high-integration bottle valve for a high-pressure hydrogen storage cylinder, characterized in that: The main valve group is arranged at the bottle mouth of the high-pressure hydrogen storage cylinder (10), and the main valve group comprises a hydrogen supply pipeline, a hydrogen filling pipeline and a pressure relief pipeline with a safety valve SV; the pipeline with a flow limiting valve TV and a cut-off valve V1 is a common sub-pipeline of the hydrogen supply pipeline and the hydrogen filling pipeline, wherein: The hydrogen supply pipeline comprises, in sequence along the medium flow direction, a flow limiting valve TV, a cut-off valve V1, a hydrogen supply switch valve V2 and a hydrogen supply port (21), and the inlet of the flow limiting valve TV is connected to the high-pressure hydrogen storage cylinder (10); The hydrogen filling pipeline comprises, in sequence along the medium flow direction, a hydrogen filling port (22), a check valve CV, a cut-off valve V1 and a flow limiting valve TV, and the medium flow direction of the check valve CV is the same as the medium flow direction of the hydrogen filling pipeline during operation; The flow limiting valve TV comprises a flow limiting valve body and a flow limiting valve core in the flow limiting valve body, and the design method of the flow limiting valve TV is as follows: S1, a three-dimensional structure model of the flow limiting valve TV is established without considering the limiting structure of the flow limiting valve core according to the given design parameters; S2, according to the three-dimensional structure model, a flow field structure model of the flow limiting valve TV is established; the flow capacity of the flow limiting valve TV under each set flow limiting valve core stroke condition is compared and judged to determine the flow limiting valve core stroke under the design flow capacity L 0 , the flow limiting valve core stroke under the design flow capacity is determined L 0 , and the rated stroke of the flow limiting valve core is obtained after being multiplied by 120% L R ​ S3, according to the given flow limiting trigger condition, the stress state of the flow limiting valve TV under each set flow limiting valve core stroke condition is analyzed by using analysis software in combination with the flow domain structure model, and a function of the comprehensive stress state of the flow limiting valve core changing with the flow limiting valve core stroke is established by fitting the test data under each flow limiting valve core stroke condition, that is: F J =f(X) In the formula: X for the actual stroke of the flow restriction spool; F J To limit the flow of the valve core under the action of the medium; S4, according to the spring installation space reserved at the flow limiting valve TV, a function of the spring stress change changing with the flow limiting valve core stroke is established, that is: F S =K [B+(L R -X)] In the formula: B Compression amount under the installation condition of the spring; F S The force of the flow limiting valve core under the action of the spring; K K is the stiffness coefficient of the spring; L R is the rated stroke of the flow restriction spool; When selecting the spring, the actual travel of the flow-restricting spool is within the range of 0,L 0 ] when F S < F J the actual travel of the flow-restricting spool is within the range of L 0 ,L R ] when F S ≥ F J .

2. The high-integration cylinder valve for high-pressure hydrogen storage cylinder according to claim 1, characterized in that: The hydrogen filling nozzle (30) is arranged at the end of the pipeline of the common sub-pipeline for connecting the high-pressure hydrogen storage cylinder (10), and the jetting direction of the hydrogen filling nozzle (30) points to the bottle cavity of the high-pressure hydrogen storage cylinder (10); the hydrogen filling nozzle (30) comprises a spray pipe (31) with a closed front end, two or more groups of nozzle holes (32) are arranged on the front end surface of the spray pipe (31), the axis of each nozzle hole (32) intersects with the axis of the spray pipe (31) in a different plane, and each nozzle hole (32) extends from the front end to the rear end of the spray pipe (31) and converges in the pipe cavity of the spray pipe (31); on the cross section perpendicular to the axis of the spray pipe (31), each nozzle hole (32) is combined to form a vortex structure.

3. The high-integration cylinder valve for high-pressure hydrogen storage cylinder according to claim 1, characterized in that: The hydrogen filling nozzle (30) is arranged at the end of the pipeline of the common sub-pipeline for connecting the high-pressure hydrogen storage cylinder (10), and the jetting direction of the hydrogen filling nozzle (30) points to the bottle cavity of the high-pressure hydrogen storage cylinder (10); the hydrogen filling nozzle (30) comprises a spray pipe (31) with a closed front end, two or more groups of nozzle holes (32) are arranged on the front end surface of the spray pipe (31), the axis of each nozzle hole (32) extends from the front end to the rear end of the spray pipe (31) and intersects with the axis of the spray pipe (31) at the same point.

4. The high-integration cylinder valve for high-pressure hydrogen storage cylinder according to claim 1, characterized in that: After the function of the spring stress change changing with the flow limiting valve core stroke is established, whether the designed flow limiting valve TV can meet the flow limiting action requirement is verified according to the given flow limiting trigger condition; if not, the spring is replaced by reducing the stiffness coefficient K by 5% each time, and steps S2-S5 are repeated until the design requirement is met.

5. The high-integration cylinder valve for high-pressure hydrogen storage cylinder according to claim 1, characterized in that: The analysis software is CFD software.

6. The high-integration cylinder valve for high-pressure hydrogen storage cylinder according to claim 1, characterized in that: The flow limiting valve core is arranged with a small flow hole in the axial direction, and a large flow hole is arranged in the radial direction of the flow limiting valve core, and the medium flow of the large flow hole is greater than that of the small flow hole.

7. The high-integration cylinder valve for high-pressure hydrogen storage cylinder according to claim 1 or 2 or 3, characterized in that: The temperature sensor T1 is also arranged in the high-pressure hydrogen storage cylinder (10), the hydrogen supply switch valve V2 is a pilot electromagnetic valve, and the circuit connector of the temperature sensor T1 is integrally injection molded with the circuit connector of the hydrogen supply switch valve V2.

8. The high-integration cylinder valve for high-pressure hydrogen storage cylinder according to claim 1 or 2 or 3, characterized in that: The pressure sensor P1 for monitoring the pressure at the pressure relief pipeline and the diffusion valve BV connected to the pressure relief pipeline are also included.

9. A high-integration cylinder valve for high-pressure hydrogen storage cylinders according to claim 1 or 2 or 3, characterized in that: The gas supply filter (50) and the inflation filter (40) are also included, the inflation filter (40) is arranged on a section of pipeline between the hydrogen filling port (22) and the check valve CV, and the gas supply filter (50) is arranged on a section of pipeline between the flow limiting valve TV and the high-pressure hydrogen storage cylinder (10).

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