Open type safety non-return device

Abstract

The utility model relates to an open type safety non-return device which comprises a device body and a valve mechanism, the device body is provided with an air inlet channel, one end of the air inlet channel is provided with an air inlet, the other end of the air inlet channel is provided with an air outlet, and the valve mechanism comprises a valve installation piece, a valve plate and a rocker. One end of the rocker is rotatably connected with the valve mounting part, the other end of the rocker is connected with the valve plate, when the valve plate naturally droops under the action of gravity and a preset gap is formed between the valve plate and the air inlet, the open type safety check device is in an open state, and the valve plate is in a closed state under the action of air pressure in a downstream pipeline of the open type safety check device. And when moving towards the air inlet and blocking the air inlet, the open type safety non-return device is in a closed state. According to the open type safety non-return device, hydrogen does not need to eject the valve plate open through the pressure of the hydrogen, and the hydrogen feeding non-return requirement of a low-pressure hydrogen conveying system can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of check valves, in particular to an open safety check valve. Background Art

[0002] Hydrogen is light in weight and has strong permeability. It can penetrate between the layers of steel coils, giving full play to its high thermal conductivity and significantly improving the heat transfer efficiency. Therefore, the bell-type furnace currently uses 100% H2 as the protective gas, which can increase the circulation volume of the protective gas in the inner hood. Moreover, hydrogen, as a reducing gas, can reduce FeO to iron at high temperatures and significantly reduce the rolling oil brought by the cold rolling mill. At the same time, using pure hydrogen as the protective atmosphere can make the crystallization more uniform and the mechanical properties of the annealed products more uniform.

[0003] According to Article 4.4.9 of GB4962-2008 Technical Regulations for Safety in the Use of Hydrogen, a check valve should be installed between the hydrogen pipeline and the devices and equipment connected to it. However, some models of bell-type furnaces currently use a low-pressure hydrogen delivery system, with a maximum hydrogen flow rate of 30Nm 3 / h, the hydrogen main supply pressure of 1.5 kg is reduced to 10Kpa through a pressure reducing valve, and the single hydrogen-using equipment is reduced to 5Kpa for use in the inner cover. The existing hydrogen pressure of 5Kpa is too low to open the valve plate of the existing check valve, and hydrogen cannot pass through the check valve channel, so the hydrogen flow rate of the furnace cannot be met and cannot meet the production process requirements of the furnace. Utility Model Content

[0004] The purpose of the utility model is to provide an open type safety non-return device so as to meet the hydrogen delivery non-return requirement of a low-pressure hydrogen delivery system.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] An open type safety check device, comprising:

[0007] The device body is provided with an air inlet channel, one end of the air inlet channel is provided with an air inlet, and the other end of the air inlet channel is provided with an air outlet;

[0008] A valve mechanism, the valve mechanism includes a valve mounting part, a valve plate and a rocker arm, the valve mounting part is arranged at the inner top of the device body, one end of the rocker arm is rotatably connected to the valve mounting part, and the other end of the rocker arm is connected to the valve plate, when the valve plate naturally droops under the action of gravity and a preset gap is formed between the valve plate and the air inlet, the open safety check device is in an open state, and when the valve plate moves toward the air inlet and blocks the air inlet under the action of the air pressure in the downstream pipeline of the open safety check device, the open safety check device is in a closed state.

[0009] In one embodiment of the present application, the device body includes a valve body and a valve cover, the valve body is provided with the air inlet, the air outlet and the installation port, the installation port is connected to the air inlet channel, one end of the valve body provided with the installation port is detachably sealed and connected to the valve cover, and the valve mounting member is provided on the valve cover.

[0010] In one embodiment of the present application, the valve mounting member includes:

[0011] a mounting rod, the mounting rod comprising a screw portion and a mounting portion connected to each other, the screw portion being threadedly engaged with a threaded hole on the device body, and the mounting portion being rotatably connected to the rocker;

[0012] An adjusting nut is threadedly connected to the screw portion to adjust the length of the screw portion screwed into the threaded hole.

[0013] In one embodiment of the present application, the valve plate is rotatably disposed on the rocker within a preset angle.

[0014] In one embodiment of the present application, the valve plate and the rocker arm are connected by a threaded fastener, and the threaded fastener includes a fastening bolt and a fastening nut. The fastening bolt passes through the valve plate and the rocker arm and is threadedly engaged with the fastening nut to connect the valve plate to the rocker arm, and the valve plate can reciprocate a preset distance relative to the rocker arm along the axial direction of the fastening bolt.

[0015] In one embodiment of the present application, the rocker arm includes a first connecting portion and a second connecting portion that are connected to each other, the end of the first connecting portion away from the second connecting portion is connected to the valve mounting member, and the end of the second connecting portion away from the first connecting portion is connected to the valve plate, the angle between the first connecting portion and the second connecting portion is an obtuse angle, and the first connecting portion is inclined toward the air inlet from the end connected to the valve mounting member.

[0016] In one embodiment of the present application, a valve seat is further included, which is nested in one side of the air inlet located in the device body. When the open safety check device is in a closed state, the valve seat is in sealing contact with the valve plate.

[0017] In one embodiment of the present application, the valve seat includes a sleeve portion and an end portion, the outer diameter of the end portion is larger than the outer diameter of the sleeve portion, and at least the sleeve portion is nested in the air inlet, and when the open safety check device is in a closed state, the end portion contacts and cooperates with the valve plate.

[0018] In one embodiment of the present application, at least one of the valve seat and the valve plate is provided with a sealing structure, and when the open safety check device is in a closed state, the valve seat and the valve plate are sealed by the sealing structure.

[0019] In one embodiment of the present application, the sealing structure includes a sealing ring groove provided on the valve seat and / or the valve plate and a sealing ring partially embedded in the sealing ring groove.

[0020] It can be seen from the above technical scheme that the utility model discloses an open safety check device, which includes a device body and a valve mechanism, wherein the device body is provided with an air inlet channel, an air inlet is provided at one end of the air inlet channel, and an air outlet is provided at the other end, and the valve mechanism includes a valve mounting part, a valve plate and a rocker arm, the valve mounting part is provided at the inner top of the device body, one end of the rocker arm is rotatably connected to the valve mounting part, and the other end of the rocker arm is connected to the valve plate, and when the valve plate naturally droops under the action of gravity and a preset gap is formed between the valve plate and the air inlet, the open safety check device is in an open state, and when the valve plate is moved toward the air inlet and blocks the air inlet under the action of the air pressure in the downstream pipeline of the open safety check device, the open safety check device is in a closed state.

[0021] During use, the air pressure on both sides of the valve plate is the same in the initial state, and the valve plate sags naturally only under the action of gravity. At this time, there is a gap between the valve plate and the air inlet, and the open safety check device is in the open state. Hydrogen can flow through the open safety check device unimpeded, normally ensuring the normal production needs of downstream hydrogen equipment. When a safety abnormality occurs in the hydrogen equipment downstream of the open safety check device, such as a deflagration, the downstream hydrogen equipment will deflagrate and backfire, causing the pressure in the downstream pipeline of the open safety check device to surge and act on the valve plate. Under the force of this action, the valve disc moves toward the air inlet until it blocks the air inlet, thereby cutting off the gas flow. This ensures the gas safety of the hydrogen pipeline equipment. It can be seen that the open safety check device provided in this case does not require hydrogen to use its own pressure to push open the valve plate, and can meet the hydrogen delivery check requirements of the low-pressure hydrogen transmission system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic structural diagram of an open safety check device provided in an embodiment of the present utility model;

[0024] Figure 2 A schematic structural diagram of the device body of the open type safety check device provided by an embodiment of the utility model;

[0025] Figure 3 A schematic structural diagram of a valve body of an open safety check device provided by an embodiment of the present utility model;

[0026] Figure 4 This is a structural schematic diagram of the valve mechanism of the open type safety check device provided in an embodiment of the utility model.

[0027] In the picture:

[0028] 1 is the device body; 110 is the valve body; 120 is the valve cover; 130 is the air inlet channel; 1a is the air inlet; 1b is the air outlet; 1c is the installation port; 1d is the installation threaded hole; 1e is the sealing ring groove;

[0029] 2 is a valve mechanism; 210 is a valve mounting part; 211 is a screw portion; 212 is a mounting portion; 213 is an adjusting nut; 220 is a rocker; 221 is a first connecting portion; 222 is a second connecting portion; 230 is a valve plate; 240 is a valve seat; 241 is a sleeve portion; 242 is an end portion; 250 is a threaded fastener; 251 is a fastening bolt; 252 is a fastening nut. DETAILED DESCRIPTION

[0030] The core of the utility model is to provide an open safety non-return device, the structural design of which satisfies the hydrogen delivery non-return requirement of a low-pressure hydrogen delivery system.

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] See also Figures 1 to 3 , Figure 1 This is a schematic structural diagram of an open safety check device provided by an embodiment of the utility model. Figure 2 This is a schematic structural diagram of the device body of the open type safety check device provided by an embodiment of the utility model. Figure 3 This is a schematic structural diagram of the valve body of the device body of the open type safety check device provided by an embodiment of the utility model. Figure 4 This is a structural schematic diagram of the valve mechanism of the open type safety check device provided in an embodiment of the utility model.

[0033] An embodiment of the utility model discloses an open type safety check device, which includes a device body 1 and a valve mechanism 2.

[0034] Among them, the device body 1 is provided with an air inlet channel 130, an air inlet 1a is provided at one end of the air inlet channel 130, and an air outlet 1b is provided at the other end. Hydrogen enters the device body 1 from the air inlet 1a and flows out of the device body 1 from the air outlet 1b. The device body 1 is made of high-pressure resistant and corrosion-resistant materials.

[0035] The valve mechanism 2 includes a valve mounting part 210, a valve plate 230 and a rocker arm 220. The valve mounting part 210 is arranged at the inner top of the device body 1. One end of the rocker arm 220 is rotatably connected to the valve mounting part 210, and the other end of the rocker arm 220 is connected to the valve plate 230. The diameter of the valve plate 230 is larger than the diameter of the air inlet 1a. When the valve plate 230 naturally droops under the action of gravity and a preset gap is formed between the valve plate 230 and the air inlet 1a, the open safety check device is in an open state. At this time, the gap between the valve plate 230 and the air inlet 1a forms a channel for gas to pass through. When the valve plate 230 moves toward the air inlet 1a and blocks the air inlet 1a under the action of the air pressure in the downstream pipeline of the open safety check device and blocks the air inlet 1a, the open safety check device is in a closed state. To ensure that the valve plate 230 can timely block the air inlet 1a, when the open safety check device is in the open state, the preset gap between the valve plate 230 and the air inlet 1a is about 5 mm.

[0036] Compared to the prior art, the open safety check device provided in the embodiment of the present invention, when in use, initially has the same air pressure on both sides of the valve plate 230. The valve plate 230 sags naturally only under the action of gravity. At this time, a gap exists between the valve plate 230 and the air inlet 1a, and the open safety check device is in the open state. Hydrogen can flow through the open safety check device unimpeded, ensuring the normal production needs of downstream hydrogen-using equipment. However, if a safety anomaly occurs in the downstream hydrogen-using equipment, such as a deflagration or flashback, the pressure in the downstream pipeline of the open safety check device will increase sharply, acting on the valve plate 230. This force pushes the valve disc toward the air inlet 1a until it blocks the air inlet 1a, thereby cutting off the gas flow. This ensures the safety of hydrogen pipeline equipment. Therefore, the open safety check device provided in this case does not require hydrogen to use its own pressure to push open the valve plate 230, and can meet the hydrogen delivery check requirements of low-pressure hydrogen transmission systems.

[0037] To facilitate production and assembly, in one embodiment of the present application, Figure 2 and Figure 3 As shown, the device body 1 includes a valve body 110 and a valve cover 120. The valve body 110 is provided with an air inlet 1a, an air outlet 1b and a mounting port 1c. The air inlet 1a and the air outlet 1b are respectively located at both ends and the air inlet 1a and the air outlet 1b are preferably coaxially arranged. The opening direction of the mounting port 1c intersects with the axis of the air inlet 1a and the air outlet 1b. The mounting port 1c is communicated with the air inlet channel 130. One end of the valve body 110 provided with the mounting port 1c is detachably sealed and connected to the valve cover 120, and the valve mounting member 210 is arranged on the valve cover 120.

[0038] A sealing ring groove 1e is provided on one of the mating surfaces of the valve cover 120 and the valve body 110, and a sealing ring is provided in the sealing ring groove 1e. When the valve cover 120 and the valve body 110 are installed together, the valve cover 120 and the valve body 110 squeeze the sealing ring to achieve sealing. One or more sealing rings can be provided.

[0039] like Figure 1 and Figure 4 As shown, in one embodiment of the present application, the valve mounting member 210 includes a mounting rod and an adjusting nut 213, wherein the mounting rod includes a screw portion 211 and a mounting portion 212 that are connected to each other, the screw portion 211 is threadedly connected to the mounting threaded hole 1d on the device body 1, the mounting portion 212 is rotatably connected to the rocker 220, and the adjusting nut 213 is threadedly connected to the screw portion 211 to adjust and lock the length of the screw portion 211 screwed into the mounting threaded hole 1d. By adjusting the length of the screw portion 211 screwed into the mounting threaded hole 1d, the position of the valve plate 230 can be adjusted and positioned during the installation process, so that the valve plate 230 is aligned with the air inlet 1a.

[0040] It is foreseeable that the valve plate 230 needs to rotate with the rocker 220. During this process, if the valve plate 230 cannot rotate relative to the rocker 220, it is easy for the valve plate 230 to fail to fully block the air inlet 1a. This requires that the initial installation angle of the valve plate 230 must be adjusted according to the rotation angle of the rocker 220 during the installation of the valve plate 230. This brings inconvenience to the installation and requires repeated debugging during the installation process. To avoid this problem, in one embodiment of the present application, the valve plate 230 can be rotatably set on the rocker 220 within a preset angle. By allowing the valve plate 230 to rotate relative to the rocker 220, when the rocker 220 drives the valve plate 230 to rotate to a position that cooperates with the air inlet 1a, the valve plate 230 can rotate relative to the rocker 220, thereby automatically adjusting its own angle to achieve the purpose of effectively blocking the air inlet 1a.

[0041] Specifically, in one embodiment of the present application, Figure 1 and Figure 4 As shown, the valve plate 230 and the rocker 220 are connected by a threaded fastener 250, and the threaded fastener 250 includes a fastening bolt 251 and a fastening nut 252. The valve plate 230 and the rocker 220 are provided with a through hole or a threaded hole for the fastening bolt 251 to pass through. The fastening bolt 251 passes through the valve plate 230 and the rocker 220 and is threadedly engaged with the fastening nut 252 to connect the valve plate 230 to the rocker 220, and the valve plate 230 can reciprocate relative to the rocker 220 along the axial direction of the fastening bolt 251 to a preset Distance, in order to ensure the sealing performance of the valve plate 230, in a specific embodiment, a threaded hole is provided on the valve plate 230, and a through hole is provided on the rocker 220. The diameter of the through hole is larger than the diameter of the fastening bolt 251. The fastening bolt 251 is threadedly engaged with the threaded hole and then passes through the through hole on the rocker 220 and is threadedly engaged with the fastening nut 252. This can ensure the sealing between the fastening bolt 251 and the valve plate 230, and at the same time enable the valve plate 230 to move back and forth relative to the rocker 220 while swinging within a preset angle.

[0042] like Figure 4 As shown, in a specific embodiment of the present application, the rocker arm 220 includes a first connecting portion 221 and a second connecting portion 222 that are connected to each other, the end of the first connecting portion 221 away from the second connecting portion 222 is connected to the valve mounting member 210, and the end of the second connecting portion 222 away from the first connecting portion 221 is connected to the valve plate 230, and the angle between the first connecting portion 221 and the second connecting portion 222 is an obtuse angle, and the first connecting portion 221 is inclined toward the air inlet 1a starting from the end connected to the valve mounting member 210.

[0043] Since the valve plate 230 needs to be in contact with the valve body 110 when closed, in order to reduce the damage of the valve plate 230 to the valve body 110 and to facilitate the valve plate 230 to close the air inlet 1a, in one embodiment of the present application, the open safety check device also includes a valve seat 240, and the valve seat 240 is nested in one side of the air inlet 1a located in the device body 1. When the open safety check device is in a closed state, the valve seat 240 is in sealing contact with the valve plate 230.

[0044] Specifically, if Figure 1 and Figure 4 As shown, the valve seat 240 includes a sleeve portion 241 and an end portion 242. The outer diameter of the end portion 242 is larger than the outer diameter of the sleeve portion 241, and at least the sleeve portion 241 is nested in the air inlet 1a. When the open safety check device is in a closed state, the end portion 242 contacts and cooperates with the valve plate 230.

[0045] To further optimize the above technical solution, in one embodiment of the present application, a sealing structure is provided on at least one of the valve seat 240 and the valve plate 230. When the open safety check device is in a closed state, the valve seat 240 and the valve plate 230 are sealed by the sealing structure, thereby avoiding gas leakage when the open safety check device is in a closed state.

[0046] Preferably, in one embodiment of the present application, the sealing structure includes a sealing ring groove 1e provided on the valve seat 240 and / or the valve plate 230 and a sealing ring partially embedded in the sealing ring groove 1e.

[0047] The open safety check device provided in the above embodiment can be applied not only to low-pressure hydrogen supply systems, but also to other low-pressure gas supply systems with check requirements, which is not limited here.

[0048] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0049] It should be understood that the use of "system," "device," "unit," and / or "module" in this application is merely a method for distinguishing different components, elements, parts, portions, or assemblies at different levels. However, if other terms can achieve the same purpose, the terms may be replaced by other expressions.

[0050] As used in this application and the claims, unless the context clearly indicates an exception, the terms "a," "an," "an," and / or "the" are not intended to refer to the singular and may include the plural, unless the context clearly indicates otherwise. Generally speaking, the terms "comprises" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements. The phrase "comprises a..." does not preclude the presence of additional identical elements in the process, method, product, or apparatus that includes the elements.

[0051] In the description of the embodiments of this application, unless otherwise specified, " / " represents or. For example, A / B can represent A or B. "And / or" in this article is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of this application, "plurality" means two or more than two.

[0052] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0053] If a flow chart is used in this application, the flow chart is used to illustrate the operations performed by the system according to the embodiments of the application. It should be understood that the previous or subsequent operations are not necessarily performed in exact order. Instead, the steps can be processed in reverse order or simultaneously. At the same time, other operations can be added to these processes, or one or more operations can be removed from these processes.

[0054] It should also be noted that, in this document, terms such as "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that an article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such article or device. In the absence of further limitations, elements defined by the phrase "comprises a ..." do not exclude the presence of other identical elements in the article or device comprising the above elements.

[0055] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help you understand the core concept of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An open safety check device, characterized in that: include: The device body is provided with an air inlet channel, one end of the air inlet channel is provided with an air inlet, and the other end of the air inlet channel is provided with an air outlet; A valve mechanism, the valve mechanism includes a valve mounting part, a valve plate and a rocker arm, the valve mounting part is arranged at the inner top of the device body, one end of the rocker arm is rotatably connected to the valve mounting part, and the other end of the rocker arm is connected to the valve plate, when the valve plate naturally droops under the action of gravity and a preset gap is formed between the valve plate and the air inlet, the open safety check device is in an open state, and when the valve plate moves toward the air inlet and blocks the air inlet under the action of the air pressure in the downstream pipeline of the open safety check device, the open safety check device is in a closed state.

2. The open type safety check device according to claim 1, characterized in that: The device body includes a valve body and a valve cover. The valve body is provided with the air inlet, the air outlet and the installation port. The installation port is connected to the air inlet channel. One end of the valve body provided with the installation port is detachably sealed with the valve cover, and the valve mounting member is provided on the valve cover.

3. The open type safety check device according to claim 1, characterized in that: The valve mounting assembly comprises: a mounting rod, the mounting rod comprising a screw portion and a mounting portion connected to each other, the screw portion being threadedly engaged with a mounting threaded hole on the device body, and the mounting portion being rotatably connected to the rocker; An adjusting nut is threadedly connected to the screw portion to adjust the length of the screw portion screwed into the mounting threaded hole.

4. The open type safety check device according to claim 1, characterized in that: The valve plate is rotatably arranged on the rocker within a preset angle.

5. The open type safety check device according to claim 4, characterized in that: The valve plate and the rocker are connected by a threaded fastener, which includes a fastening bolt and a fastening nut. The fastening bolt passes through the valve plate and the rocker and engages with the fastening nut thread to connect the valve plate to the rocker, and the valve plate can reciprocate a preset distance relative to the rocker along the axial direction of the fastening bolt.

6. The open type safety check device according to any one of claims 1 to 5, characterized in that: The rocker arm includes a first connecting portion and a second connecting portion that are connected to each other, wherein an end of the first connecting portion away from the second connecting portion is connected to the valve mounting member, and an end of the second connecting portion away from the first connecting portion is connected to the valve plate, and an angle between the first connecting portion and the second connecting portion is an obtuse angle, and the first connecting portion is inclined toward the air inlet from the end connected to the valve mounting member.

7. The open type safety check device according to any one of claims 1 to 5, characterized in that: It also includes a valve seat, which is nested in one side of the air inlet located in the device body. When the open safety check device is in a closed state, the valve seat is in sealing contact with the valve plate.

8. The open type safety check device according to claim 7, characterized in that: The valve seat includes a sleeve portion and an end portion, the outer diameter of the end portion is larger than the outer diameter of the sleeve portion, and at least the sleeve portion is nested in the air inlet, and when the open safety check device is in a closed state, the end portion contacts and cooperates with the valve plate.

9. The open type safety check device according to claim 7, characterized in that: At least one of the valve seat and the valve plate is provided with a sealing structure, and when the open safety check device is in a closed state, the valve seat and the valve plate are sealed by the sealing structure.

10. The open type safety check device according to claim 9, characterized in that: The sealing structure includes a sealing ring groove provided on the valve seat and / or the valve plate and a sealing ring partially embedded in the sealing ring groove.

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