Porous depressurization hydrogen regulating valve

Abstract

The utility model relates to a porous depressurization hydrogen regulating valve, which comprises a valve body, and a valve cover, a valve rod, a valve core and a valve seat which are arranged in the valve body, the valve core is arranged at the middle position in the valve body, the valve cover is arranged right above the valve core, a through hole for the valve rod to pass through is arranged at the middle position of the valve cover, one end of the valve rod is connected with the valve core in the valve body, and the other end of the valve rod is connected with the valve seat. The valve element is located in the valve body and provided with a multi-hole pressure reduction throttling sleeve, a plurality of rows of throttling holes are formed in the vertical face of the sleeve, each row is provided with 2-3 oblong holes distributed at equal intervals, and the number of the oblong holes in each row is distributed in a staggered mode. The flow can be adjusted according to the number of throttling holes in the porous throttling sleeve which can be opened by moving up and down. One end of the multi-hole pressure reduction throttling sleeve abuts against the valve deck, the other end of the multi-hole pressure reduction throttling sleeve abuts against a valve seat arranged under the valve element, and a channel in the valve body is divided into a plurality of cavities. The utility model has the advantages of simple structure, practicability, convenience, good leakproofness, safety, high efficiency and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of regulating valves and hydrogen energy utilization, and relates to a multi-hole pressure-reducing hydrogen regulating valve. Background Art

[0002] In the field of industrial automation of power plants, hydrogen energy utilization fields such as hydrogen refueling stations, control valves are widely used to adjust process parameters such as pressure and flow of the medium. According to the control signal, the valve opening is automatically adjusted to achieve precise control and regulation to meet the requirements of the process flow.

[0003] With the vigorous development of hydrogen energy utilization in China, the production process in the fields of hydrogen production, hydrogenation and use has been continuously improved, the safety requirements for hydrogen have been increasingly valued, and the requirements for valves in hydrogen systems have become increasingly higher. Hydrogen system valves need to adapt to the working conditions of high pressure difference before and after the valve, reduce the erosion of the fluid on the valve core and valve seat, and improve the control accuracy.

[0004] Generally, a valve cage, valve stem, and valve core are installed coaxially in the internal flow channel of the regulating valve, which can adapt to various opening and closing conditions and have flexible movements. However, for high pressure difference working conditions, the control effect and control accuracy are not ideal, the flow rate of the flowing medium is fast, the valve stem and the valve seat are easy to deviate, and it is easy to cause vibration. The traditional labyrinth-type pressure reduction structure is complicated to process, and the flow channel is not very suitable for hydrogen medium. The medium of the regulating valve is hydrogen, which has a great influence on different metal materials and sealing, and is prone to hydrogen embrittlement, hydrogen corrosion, hydrogen bulging and hydrogen escape, which seriously affects the safety of use.

[0005] The source of hydrogen can be transported by high-pressure hydrogen long-tube trailers, with a delivery pressure of more than 20MPa, and even as high as 50MPa abroad. For different application scenarios, the working pressure of hydrogen at the outlet of the regulating valve is different. For large-scale gas turbine power plants, it is about 4.0~5.0MPa. The working pressure of the regulating valve and the maximum pressure difference before and after the valve are both high, which places high requirements on the structural form and strength design of the valve. In addition, when transporting hydrogen long-tube trailers, the hydrogen flow rate varies greatly, and the hydrogen storage capacity of each vehicle is about 4000Nm 3 / h, the maximum instantaneous gas discharge volume is about 1500Nm 3 / h. As the gas cylinders in the long tube trailer are continuously loaded and unloaded, the hydrogen flow rate continues to decrease, and the flow regulation characteristics of the valve are also required to be high, and precise flow regulation needs to be achieved.

[0006] Therefore, a porous decompression hydrogen regulating valve is designed to overcome and solve the above problems. Utility Model Content

[0007] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide a porous pressure-reducing hydrogen regulating valve with a simple structure, practical convenience, good airtightness, safety and high efficiency, and a long service life. The utility model solves the problems of unsatisfactory control accuracy of the existing regulating valves, easy deviation of the valve stem and the valve seat, and easy vibration of the valve due to high fluid flow rate. The pressure reducing principle of the high-pressure hydrogen regulating valve is throttling and pressure reduction. When the gas passes through the sudden contraction pipe, the effective flow cross-sectional area decreases sharply, and the gas accelerates sharply. According to the law of conservation of energy, the pressure energy is converted into kinetic energy at this time, so that the kinetic energy increases and the pressure drops sharply. Therefore, throttling and pressure reduction can be achieved after the high-pressure gas flows through the sudden contraction pipe.

[0008] The utility model is realized through the following technical scheme: a porous decompression hydrogen regulating valve, comprising a valve body and a valve cover, a valve stem, a valve core and a valve seat arranged in the valve body, a valve core is arranged in the middle position of the valve body, a valve cover is arranged just above the valve core, the valve cover is connected to the valve body through bolts on both sides, a through hole for the valve stem to pass through is arranged in the middle position of the valve cover, one end of the valve stem is connected to the valve core in the valve body, and the other end thereof is connected to an actuator outside the valve body, and a power source for valve movement is provided through the actuator, at least one side of the valve core is located in the valve body and a porous decompression throttling sleeve is installed, one end of the porous decompression throttling sleeve is abutted against the valve cover, and the other end thereof is abutted against a valve seat arranged just below the valve core, so that the internal channel of the valve body is divided into a plurality of chambers; an input end is arranged on one side of the valve body, and an output end is arranged on the opposite other side thereof, and hydrogen from an upstream gas source end is sequentially input to the input end, the internal channel of the valve body and the output end, and then transmitted to the downstream.

[0009] Preferably, the porous pressure-reducing and throttling sleeve divides the internal flow channel of the valve body into a first chamber, a second chamber and a third chamber from left to right, and a valve core is installed at the position of the second chamber.

[0010] Preferably, a plurality of rows of throttling holes are arranged on the side of the porous pressure-reducing throttling sleeve, which are oblong holes and are staggered. The valve stem drives the valve core to move so as to adjust the opening number of the plurality of rows of throttling holes on the side of the porous pressure-reducing throttling sleeve, so as to achieve precise matching and adjustment of pressure and flow. An O-ring for sealing is installed between the valve core and the upper part of the throttling sleeve to avoid hydrogen leakage.

[0011] Preferably, a shift flange is provided between the porous pressure-reducing and throttling sleeve and the valve body for fixing the porous pressure-reducing and throttling sleeve.

[0012] Preferably, the porous pressure-reducing throttling sleeve and the upper portion of the throttling sleeve are made of 316L stainless steel.

[0013] Preferably, the input end and the output end of the valve body are connected to the external pipeline via flanges, welding or threads.

[0014] Preferably, the valve body and the valve cover are fastened together by nuts, studs and metal spiral wound gaskets to ensure reliable sealing between the two and avoid leakage of the medium.

[0015] Preferably, the actuator is pneumatic or electric.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1) When using the utility model, the user selects the number of rows, number of holes, diameter, and spacing angle of the throttling holes in the throttling sleeve according to his own needs, according to the requirements of hydrogen flow, parameters, and pressure drop. The valve port is a staggered structure of oblong holes, and the precise adjustment of hydrogen pressure and flow is achieved according to the opening and closing of the valve core at different openings up and down. At the same time, the temperature rise caused by the drop in hydrogen pressure is very small, and the noise is almost negligible;

[0018] 2) The working medium of this regulating valve is hydrogen. Due to the particularity of hydrogen embrittlement and hydrogen corrosion, the regulating valve body and internal components are made of 316L, and there are no sharp or convex parts. It adopts a cage-type structure, and the oblong regulating hole is smooth and clean, and the edge wall is not easily damaged, which prolongs the service life;

[0019] 3) The cage-type valve port structure and the arrangement of multiple groups of long circular holes allow the regulated hydrogen to scatter in a circular direction, which will not cause high pressure on one side of the valve port or pressure imbalance, causing little damage to the valve body and making the regulating valve safer to use;

[0020] 4) Hydrogen molecules are very small and have a strong tendency to escape hydrogen, especially when all valves are closed. The cage-type structure facilitates the design of the sealing structure. The valve core seal adopts the latest structure for upper and lower end face sealing, and the internal valve port adopts a bipolar O-ring seal. This sealing method can effectively prevent tiny hydrogen leaks, and the structural sealing level can reach V level, ensuring the safe use of the control valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the utility model.

[0022] Figure 2 It is an enlarged schematic diagram of the inner cylinder valve core in the utility model.

[0023] Figure 3 It is a front view of the multi-hole pressure-reducing and throttling sleeve in the utility model.

[0024] Figure 4 It is a flow regulation principle diagram of the multi-hole pressure-reducing and throttling sleeve in the utility model.

[0025] Figure 5 It is a stereoscopic diagram of the multi-hole pressure-reducing and throttling sleeve in the utility model.

[0026] Figure 6 It is a stereogram of the utility model.

[0027] Figure 7 It is the flow characteristic curve and Cv value curve of the hydrogen regulating valve. DETAILED DESCRIPTION

[0028] In order to enable ordinary technicians in the field to more clearly understand the purpose, technical solutions and advantages of the utility model, the utility model is further explained below in conjunction with the accompanying drawings and embodiments.

[0029] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "horizontal" and "vertical" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate or imply that the device or component referred to must have a specific direction and therefore should not be understood as a limitation on the present invention.

[0030] The utility model will be described in detail below with reference to the accompanying drawings: Figure 1 As shown, a porous decompression hydrogen regulating valve comprises a valve body 1 and a valve cover 4, a valve stem 6, a valve core 7 and a valve seat 8 arranged in the valve body 1. The valve core 7 is arranged in the middle of the valve body 1, and the valve cover 4 is arranged just above the valve core 7. The valve cover 4 is connected to the valve body 1 through bolts 5 on both sides. A through hole for the valve stem 6 to pass through is arranged in the middle of the valve cover 4. One end of the valve stem 6 is connected to the valve core 7 in the valve body 1, and the other end is connected to the actuator 16 outside the valve body 1. 16 provides a power source for the valve movement. At least one side of the valve core 7 is provided with a porous pressure-reducing throttling sleeve 9 in the valve body 1. One end of the porous pressure-reducing throttling sleeve 9 abuts against the valve cover 4, and the other end thereof abuts against the valve seat 8 arranged just below the valve core 7, so as to divide the internal channel of the valve body 1 into a plurality of chambers. An input end 2 is provided on one side of the valve body 1, and an output end 3 is provided on the other side thereof. The hydrogen from the upstream gas source end is sequentially input into the input end 2, the internal channel of the valve body 1 and the output end 3, and then transmitted to the downstream.

[0031] There are two porous pressure-reducing and throttling sleeves 9, which are symmetrically arranged on the left and right sides of the valve core 7, and divide the internal flow channel of the valve body 1 into a first chamber 11, a second chamber 12 and a third chamber 13 from left to right. The valve core 7 is installed at the position of the second chamber 12.

[0032] The side of the porous pressure-reducing throttling sleeve 9 is provided with multiple rows of throttling holes, and the valve stem 6 drives the valve core 7 to move so as to adjust the number of openings of the multiple rows of throttling holes 17 on the side of the porous pressure-reducing throttling sleeve 9, thereby achieving precise matching and adjustment of pressure and flow. An O-ring 14 for sealing is installed between the valve core 7 and the porous pressure-reducing throttling sleeve 9, which can effectively prevent tiny leakage of hydrogen and ensure the safe use of the regulating valve.

[0033] A sealing gasket 15 is provided between the porous pressure-reducing and throttling sleeve 9 and the valve body 1 to fix the porous pressure-reducing and throttling sleeve 9 in a horizontal direction.

[0034] The porous pressure-reducing and throttling sleeve 9 is made of 316L stainless steel.

[0035] The input end 2 and the output end 3 of the valve body 1 are connected to the external pipeline by flange, welding or thread. More specifically, when the outer diameter of the connecting pipeline is greater than 28 mm, the input end 2 and the output end 3 are preferably connected to the external pipeline by flange connection, and the flange should comply with the relevant provisions of HG / T 20592~20635. When the outer diameter of the connecting pipeline is less than or equal to 28 mm, the input end 2 and the output end 3 can be connected to the external pipeline by double ferrule joint, welding or tapered pipe thread connection, and the double ferrule joint should comply with the provisions of GB 3765. The composite sealing material and gasket of the pipe joint are selected from materials suitable for hydrogen such as polytetrafluoroethylene.

[0036] The valve body 1 and the valve cover 4 are fastened together by nuts, studs and metal spiral wound gaskets to ensure reliable sealing between the two and avoid leakage of the medium.

[0037] The actuator 16 provides a power source for the valve action, which is a common structure. The actuator can be pneumatic or electric (explosion-proof). The stroke display 10 can display the stroke position in real time.

[0038] The enlarged structure diagram of the inner tube valve core is as follows Figure 2 shown.

[0039] like Figure 3 As shown, 10 rows of throttling holes are arranged on the vertical surface of the multi-porous pressure-reducing throttling sleeve, and each row is provided with 2 or 3 Φ20mm long circular holes with a center spacing of 30mm, totaling 25 holes. The number and diameter of the throttling holes are calculated and determined according to the hydrogen flow rate and parameters. The number of throttling holes in the multi-porous pressure-reducing throttling sleeve can be opened by moving up and down to adjust the flow rate. Figure 4 The figure shows the flow cross-section diagram of the hydrogen regulating valve at different openings (red represents the open cross-section). The dimensions in the figure are only for the embodiment. Figure 5 This is a flow regulation principle diagram of the multi-hole pressure-reducing and throttling sleeve in the utility model.

[0040] like Figure 6 The figure shows a stereoscopic view of the multi-porous pressure-reducing hydrogen regulating valve involved in the utility model. Example

[0041] In this embodiment, the hydrogen flow rate is about 15000Nm 3 / h calculation, select the control valve diameter as DN150, the control valve flow characteristics and Cv curve are as follows Figure 7 As shown, it can be seen that the curve is continuous and close to linear, and the flow rate can be continuously and accurately controlled by changing the valve opening. When the valve opening is 100%, the hydrogen flow rate is 15000Nm 3 / h; when the valve opening is 75%, the hydrogen flow rate is about 12750Nm 3 / h; when the valve opening is 50%, the hydrogen flow rate is about 9300Nm 3 / h; when the valve opening is 25%, the hydrogen flow rate is about 5260 Nm 3 / h.

[0042] Since the small holes of the sleeve are arranged in the form of oblong holes and the oblong holes are arranged in a staggered manner, when the valve opening changes from 100% to 20%, the flow cross-sectional area can be increased from 15000mm 2 Continuously reduced to 5300mm 2 The flow characteristic curve is smooth, the flow cross-sectional area changes continuously, and the hydrogen flow rate can be continuously adjusted with the change of valve opening.

[0043] The specific embodiments described herein are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A porous pressure-reducing hydrogen regulating valve, comprising a valve body (1) and a valve cover (4), a valve stem (6), a valve core (7) and a valve seat (8) arranged in the valve body (1), characterized in that: A valve core (7) is arranged in the middle of the valve body (1), and a valve cover (4) is arranged directly above the valve core (7). The valve cover (4) is connected to the valve body (1) via bolts (5) on both sides. A through hole for a valve stem (6) to pass through is arranged in the middle of the valve cover (4). One end of the valve stem (6) is connected to the valve core (7) in the valve body (1), and the other end of the valve stem (6) is connected to the actuator (16) outside the valve body (1). The actuator (16) provides a power source for the valve movement. A multi-hole pressure-reducing throttling sleeve (9) is installed in the valve body (1) on at least one side, one end of the multi-hole pressure-reducing throttling sleeve (9) abuts against the valve cover (4), and the other end of the multi-hole pressure-reducing throttling sleeve (9) abuts against the valve seat (8) arranged directly below the valve core (7), thereby dividing the internal passage of the valve body (1) into a plurality of chambers; an input end (2) is arranged on one side of the valve body (1), and an output end (3) is arranged on the other side opposite thereto, and hydrogen from an upstream gas source is sequentially input into the input end (2), the internal passage of the valve body (1), and the output end (3), and then output to the downstream.

2. The porous pressure-reducing hydrogen regulating valve according to claim 1, characterized in that: The porous pressure-reducing throttling sleeve (9) divides the internal flow passage of the valve body (1) into a first chamber (11), a second chamber (12) and a third chamber (13) from left to right, and a valve core (7) is installed at the position of the second chamber (12).

3. The porous pressure-reducing hydrogen regulating valve according to claim 2, characterized in that: A plurality of rows of throttling holes (17) are arranged on the vertical surface of the sleeve, and each row is provided with 2 to 3 oblong holes that are equidistantly distributed. The number of oblong holes in each row is staggered, and the number of throttling holes (17) in the porous pressure-reducing throttling sleeve (9) that can be opened by moving up and down can be used to adjust the flow rate; an O-ring (14) for sealing is installed between the valve core (7) and the upper part (10) of the throttling sleeve to prevent hydrogen leakage.

4. The porous pressure-reducing hydrogen regulating valve according to claim 3 is characterized in that: A shift flange (19) is provided between the porous pressure-reducing and throttling sleeve (9) and the valve body (1) and is used to fix the porous pressure-reducing and throttling sleeve (9).

5. The porous pressure-reducing hydrogen regulating valve according to claim 4 is characterized in that: The porous pressure-reducing throttling sleeve (9) and the throttling sleeve upper part (10) are made of 316L stainless steel.

6. The porous pressure-reducing hydrogen regulating valve according to claim 4, characterized in that: The input end (2) and the output end (3) of the valve body (1) are connected to the external pipeline via flanges, welding or threads.

7. The porous pressure-reducing hydrogen regulating valve according to claim 6, characterized in that: The valve body (1) and the valve cover (4) are fastened together by nuts, studs, and metal spiral wound gaskets to ensure reliable sealing between the two and prevent leakage of the medium.

8. The porous decompression hydrogen regulating valve according to claim 7, characterized in that: The actuator (16) is pneumatic or electric.

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