Pipeline valve connecting piece and boiler gas pipeline structure

Abstract

The utility model discloses a pipeline valve connecting piece and a boiler gas pipeline structure, and relates to the technical field of boiler pipelines, the pipeline valve connecting piece comprises a valve seat, one side of the valve seat is used for being connected with a gas downstream pipeline, and the other side of the valve seat is used for being connected with a gas upstream pipeline; one side of the first sealing shell is connected with one side of the valve seat, and the other side of the first sealing shell is used for being connected with the side wall of a gas downstream pipeline; the valve rod is connected with the valve seat; the fixing ring is connected with the first sealing shell, a sliding groove is formed in the side wall of the fixing ring, an air bag is arranged in the sliding groove, and the air bag is used for expanding and extending in the direction of the sliding groove; one end of the air bag is communicated with the first sealing shell, the other end of the air bag is connected with a sliding piece, and the sliding piece abuts against the valve rod.

Description

TECHNICAL FIELD

[0001] The utility model relates to a boiler pipeline technical field especially a pipeline valve connecting piece and boiler gas conveying pipeline structure. BACKGROUND

[0002] In the boiler gas conveying pipeline system, the pipeline valve connecting piece is a crucial component, and its performance and quality directly affect the safety, stability and reliability of the entire gas conveying system. The valve connecting piece plays a key role in connecting the pipeline and the valve, controlling the gas flow and flow direction, and ensuring the stable and efficient operation of the boiler.

[0003] With the continuous development of industrial production, the requirements for the boiler gas conveying pipeline system are also becoming higher and higher. On the one hand, in many industrial scenarios, the boiler gas conveying pipeline needs to work stably for a long time under harsh conditions such as high temperature and high pressure, which puts higher challenges on the sealing performance, pressure resistance and high temperature resistance of the pipeline valve connecting piece. Some existing pipeline valve connecting pieces have problems such as aging and deformation of the sealing structure under high temperature and high pressure, leading to gas leakage. At this time, if the valve cannot be closed in time, it may cause safety accidents. SUMMARY

[0004] To solve the problem of gas leakage at the connection between the gas downstream pipeline and the valve and the inability to close the valve in time in the prior art, the utility model provides a pipeline valve connecting piece and a boiler gas conveying pipeline structure.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] The first aspect of the present application provides a pipeline valve connecting piece, which comprises: a valve seat, one side of the valve seat being used for connecting a gas downstream pipeline, the other side of the valve seat being used for connecting a gas upstream pipeline; a first sealing shell, one side of the first sealing shell being connected with one side of the valve seat, the other side of the first sealing shell being used for connecting the side wall of the gas downstream pipeline; a valve rod, the valve rod being connected with the valve seat; a fixing ring, the fixing ring being connected with the first sealing shell, a sliding groove being provided on the side wall of the fixing ring, an air bag being provided in the sliding groove, the air bag being used for expanding and extending in the direction of the sliding groove; one end of the air bag being in communication with the first sealing shell, the other end of the air bag being connected with a sliding member, the sliding member abutting against the valve rod.

[0007] Preferably, the air bag comprises an expansion part, a containing part and an air inlet part, one end of the expansion part being connected with the sliding member, the other end of the expansion part being stacked and arranged in the containing part and connected with the air inlet part, the air inlet part being in communication with the first sealing shell.

[0008] Preferably, the second sealing shell is further provided, one side of the second sealing shell is connected with the other side of the valve seat, the other side of the second sealing shell is used for connecting the side wall of the gas upstream pipeline, and one end of the air bag is communicated with the second sealing shell.

[0009] Preferably, the one end of the air bag communicated with the first sealing shell comprises:

[0010] The first gas hole is arranged on the fixed ring, the second gas hole is arranged on the first sealing shell, the first gas hole is connected with the second gas hole through a first gas pipe, and the air inlet part is in sealing connection with the first gas pipe.

[0011] Preferably, the one end of the air bag communicated with the second sealing shell comprises:

[0012] The third gas hole is arranged on the second sealing shell, the third gas hole is connected with the first gas pipe through a second gas pipe, and the air inlet part is communicated with the second sealing shell through the first gas pipe and the second gas pipe.

[0013] Preferably, one side of the first sealing shell is in sealing connection with one side of the valve seat through a first connecting piece.

[0014] Preferably, one side of the second sealing shell is in sealing connection with the other side of the valve seat through a second connecting piece.

[0015] The second aspect of the present application provides a boiler gas pipeline structure, comprising the pipeline valve connecting piece, and further comprising a gas downstream pipeline and a gas upstream pipeline, one side of the gas downstream pipeline is connected with one side of the valve seat, and the other side of the gas upstream pipeline is connected with the other side of the valve seat.

[0016] The present application has the beneficial effects that when gas leakage occurs at the connection between the gas downstream pipeline and the valve, the leaked gas first enters the first sealing shell. Since the first sealing shell is communicated with the air bag air inlet end, the gas rapidly enters the air bag, so that the air bag rapidly expands and extends along the sliding groove direction. The air bag pushes the sliding piece connected therewith, the sliding piece abuts against the valve rod, and then drives the valve rod to act, so that the valve is timely closed. In the initial stage of leakage, the gas continues to leak. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a top view structural schematic diagram of the embodiment one of the present application.

[0018] Figure 2 It is a top view sectional structure schematic diagram of the embodiment one of the present application with the first sealing shell.

[0019] Figure 3 It is a top view sectional structure schematic diagram of the embodiment one of the present application with the second sealing shell.

[0020] Figure 4 Figure 1 is a side view structural schematic diagram of the utility model embodiment one;

[0021] Figure 5 Figure 1 is a side view structural schematic diagram of the utility model embodiment one with first connecting piece, second connecting piece.

[0022] Reference signs: 1, valve seat; 2, gas downstream pipeline; 3, gas upstream pipeline; 4, first sealing shell; 401, second air hole; 5, valve stem; 6, fixed ring; 601, sliding groove; 602, first air hole; 7, air bag; 701, expansion part; 702, containing part; 703, air inlet part; 8, sliding member; 9, second sealing shell; 10, first air pipe; 11, second air pipe; 12, first connecting piece; 13, second connecting piece. DETAILED DESCRIPTION

[0023] To make the purpose, scheme and advantages of the utility model more clearly and clearly, the utility model is further explained in detail below by combining with embodiments and drawings, and the illustrative embodiment of the utility model and its explanation are only used to explain the utility model, and not as the limitation of the utility model.

[0024] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the utility model. However, it is apparent to those skilled in the art that the utility model can be practiced without these specific details. In other embodiments, well-known structures, circuits, materials or methods are not specifically described in order to avoid obscuring the utility model.

[0025] In the whole specification, the mention of "one embodiment", "embodiment", "one example" or "example" means that the specific features, structures or characteristics described in conjunction with the embodiment or example are included in at least one embodiment of the utility model. Therefore, the phrases "one embodiment", "embodiment", "one example" or "example" appearing in various places in the whole specification do not necessarily refer to the same embodiment or example. In addition, specific features, structures or characteristics can be combined in one or more embodiments or examples in any appropriate combination and / or subcombination. In addition, those skilled in the art should understand that the drawings provided herein are for illustrative purposes, and the drawings are not necessarily drawn to scale. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] In the description of the utility model, the terms "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the protection scope of the utility model.

[0027] Embodiment one provides a kind of pipeline valve connecting piece, as shown in Figure 1 One side of the valve seat 1 is used to connect the gas downstream pipeline 2, the other side of the valve seat 1 is used to connect the gas upstream pipeline 3;First sealing shell 4, one side of the first sealing shell 4 is connected with one side of the valve seat 1, the other side of the first sealing shell 4 is used to connect the side wall of gas downstream pipeline 2;Valve stem 5, the valve stem 5 is connected with the valve seat 1;Fixed ring 6, the fixed ring 6 is connected with the first sealing shell 4, sliding groove 601 is arranged on the side wall of the fixed ring 6, air bag 7 is arranged in the sliding groove 601, the air bag 7 is used to expand and extend along the direction of sliding groove 601;One end of the air bag 7 is communicated with the first sealing shell 4, the other end of the air bag 7 is connected with sliding part 8, the sliding part 8 is abutted with the valve stem 5.

[0028] Reference, in one possible example, valve seat 1 and gas downstream pipeline 2 can be connected by thread, valve seat 1 and gas upstream pipeline 3 can also be connected by thread, thread is processed at the interface of pipeline and valve, and the two are connected by rotating.

[0029] In another possible example, valve seat 1 and gas downstream pipeline 2 can be connected by flange, valve seat 1 and gas upstream pipeline 3 can also be connected by flange, flange connection is that flange plate is welded or cast at both ends of pipeline and valve respectively, and then the two flange plates are tightly connected together by bolt, and sealing gasket, such as rubber gasket or metal winding gasket, is usually placed in the middle to ensure sealing performance.

[0030] Reference, in one possible example, the first sealing shell 4 is made of stainless steel material, and one side is tightly connected with the valve seat 1 by welding process to ensure the firmness and sealing performance of connection;The other side is sealed and connected with the side wall of gas downstream pipeline 2 by sealing rubber ring.

[0031] Reference, in one possible example, the first sealing shell 4 is pre-processed with mounting hole matched with the fixed ring 6.In connection, stainless steel bolt is used to fix the fixed ring 6 with the first sealing shell 4.

[0032] By way of reference, in one possible example, the shape of the air bag 7 matches the sliding groove 601. In normal circumstances, the air bag 7 is in a contracted state and is placed in the sliding groove 601. When gas leakage occurs at the connection between the gas downstream pipe 2 and the valve seat 1, the leaked gas enters the first sealing shell 4, and then enters the air bag 7 through the air inlet end of the air bag 7 which is in communication with the first sealing shell 4. As the gas continues to enter, the air bag 7 begins to expand, and due to the restriction of the sliding groove 601, the air bag 7 can only extend in the direction of the sliding groove 601. In order to ensure that the air bag 7 can smoothly expand and extend, the inner wall of the sliding groove 601 is polished to reduce friction. At the same time, a layer of lubricating grease is applied to the surface of the air bag 7 to further reduce frictional resistance. During the expansion of the air bag 7, the sliding member 8 connected to the other end of the air bag 7 moves with the extension of the air bag 7, and finally pushes the valve stem 5 to act, closing the valve.

[0033] By way of reference, in one possible example, the sliding member 8 can be a sliding block or a sliding rod, and the sliding member 8 and the valve abut when the valve is fully open.

[0034] In one possible implementation, as shown in Figure 2 the air bag 7 includes an expansion part 701, a containing part 702, and an air inlet part 703. One end of the expansion part 701 is connected to the sliding member 8, the other end of the expansion part 701 is stacked in the containing part 702 and connected to the air inlet part 703, and the air inlet part 703 is in communication with the first sealing shell 4.

[0035] By way of reference, in one possible example, a metal insert can be connected to one end of the expansion part 701, and a clamping groove matching the metal insert is processed on the sliding member 8. After the metal insert is inserted into the clamping groove, a bolt is used for fastening, to ensure that the expansion part 701 is firmly connected to the sliding member 8, and can effectively transmit the expansion force to the sliding member 8.

[0036] The expansion part 701 can be designed in a bellows shape. This structure can achieve a larger expansion amount in a limited space, and can maintain good directionality during expansion, which is more conducive to expansion in the direction of the sliding groove 601.

[0037] When gas leakage occurs at the connection between the gas downstream pipe 2 and the valve seat 1, the leaked gas enters the first sealing shell 4. Since the gas inlet part 703 is in communication with the first sealing shell 4, the gas enters the expansion part 701 through the filter screen of the gas inlet part 703. As the gas continues to flow in, the pressure in the expansion part 701 gradually increases, and the corrugated expansion part 701 begins to continuously expand in the containing part 702, expanding from the containing part 702 towards the sliding groove 601. Since the expansion part 701 is tightly connected to the sliding piece 8, the thrust generated by the expansion pushes the sliding piece 8 to move along the sliding groove 601. The sliding piece 8 abuts against the valve stem 5, thereby driving the valve stem 5 to act, so that the valve is closed in time to prevent the gas from continuing to leak.

[0038] In a possible implementation, as shown in Figure 3 , a second sealing shell 9 is further included, one side of the second sealing shell 9 is connected to the other side of the valve seat 1, the other side of the second sealing shell 9 is used to connect the side wall of the gas upstream pipe 3, and one end of the air bag 7 is in communication with the second sealing shell 9.

[0039] For reference, as shown in Figure 4 , one end of the air bag 7 in communication with the first sealing shell 4 includes:

[0040] The first gas hole 602 is arranged on the fixed ring 6, and the second gas hole 401 is arranged on the first sealing shell 4; the first gas hole 602 and the second gas hole 401 are connected through the first gas pipe 10, and the gas inlet part 703 is sealingly connected to the first gas pipe 10. One end of the air bag 7 in communication with the second sealing shell 9 includes: a third gas hole is arranged on the second sealing shell 9, the third gas hole is connected to the first gas pipe 10 through the second gas pipe 11, and the gas inlet part 703 is in communication with the second sealing shell 9 through the first gas pipe 10 and the second gas pipe 11.

[0041] When gas leakage occurs at the connection between the gas downstream pipe 2 and the valve seat 1 or at the connection between the gas upstream pipe 3 and the valve seat 1, the leaked gas enters the first sealing shell 4 and the second sealing shell 9, respectively. The gas entering the first sealing shell 4 enters the gas inlet part 703 of the air bag 7 through the second gas hole 401 and the first gas pipe 10. The gas entering the second sealing shell 9 also enters the gas inlet part 703 of the air bag 7 through the third gas hole, the second gas pipe 11 and the first gas pipe 10. As the gas continues to enter the air bag 7, the air bag 7 expands and pushes the sliding piece 8 connected thereto, the sliding piece 8 abuts against the valve stem 5 and drives the valve stem 5 to act, so that the valve is closed in time to prevent the gas from further leaking.

[0042] In a possible implementation, as shown in Figure 5As shown, one side of the first sealing shell 4 is sealingly connected with one side of the valve seat 1 through a first connecting piece 12. One side of the second sealing shell 9 is sealingly connected with the other side of the valve seat 1 through a second connecting piece 13.

[0043] For reference, the inner diameter of the first sealing shell 4 and the second sealing shell 9 is slightly larger than the outer diameter of the gas downstream pipeline 2 and the gas upstream pipeline 3, facilitating the sleeving through the pipeline. The first connecting piece 12 and the second connecting piece 13 can adopt a stainless steel flange plate for connection with the sealing shell.

[0044] In the specific implementation process, the first sealing shell 4 is sleeved through the gas downstream pipeline 2, and the side close to the valve seat 1 is aligned with the flange plate of the first connecting piece 12. Fluorine rubber sealing gaskets are placed on the sealing surfaces of the two, and then bolts are passed through the bolt holes on the sealing shell and the first connecting piece 12 and tightened with nuts. The bolts are tightened in the same diagonal order step by step to ensure the sealing effect. The second sealing shell 9 is installed in the same way as the first sealing shell 4, that is, the second sealing shell 9 is sleeved through the gas upstream pipeline 3, connected with the flange plate of the second connecting piece 13, and the sealing gaskets are installed and the bolts are tightened.

[0045] The second embodiment provides a boiler gas pipeline structure, which comprises the pipeline valve connecting piece described above, further comprises a gas downstream pipeline and a gas upstream pipeline, the gas downstream pipeline is connected with one side of the valve seat, and the gas upstream pipeline is connected with the other side of the valve seat.

[0046] The above-described embodiments only express the specific implementation of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application.

Claims

1. A pipe valve connector, characterized in that, The utility model relates to a pipeline valve connecting piece, including: Valve seat (1), one side of valve seat (1) is used for connecting gas downstream pipeline (2), the other side of valve seat (1) is used for connecting gas upstream pipeline (3); First sealing shell (4), one side of first sealing shell (4) is connected with one side of valve seat (1), the other side of first sealing shell (4) is used for connecting the lateral wall of gas downstream pipeline (2); Valve stem (5) is connected with valve seat (1); Fixed ring (6) is connected with first sealing shell (4), and sliding groove (601) is arranged on the lateral wall of fixed ring (6), air bag (7) is arranged in sliding groove (601), air bag (7) is used for extending in the direction of sliding groove (601) and is inflated;One end of air bag (7) is communicated with first sealing shell (4), and the other end of air bag (7) is connected with sliding piece (8), and sliding piece (8) is abutted with valve stem (5).

2. A plumbing valve connector according to claim 1, wherein, Air bag (7) includes inflation part (701), containing portion (702) and intake portion (703), one end of inflation part (701) is connected with sliding piece (8), the other end of inflation part (701) is stacked in containing portion (702) and is connected with intake portion (703), and intake portion (703) is communicated with first sealing shell (4).

3. A pipe valve connector according to claim 2, wherein, It further includes second sealing shell (9), one side of second sealing shell (9) is connected with the other side of valve seat (1), the other side of second sealing shell (9) is used for connecting the lateral wall of gas upstream pipeline (3), and one end of air bag (7) is communicated with second sealing shell (9).

4. A plumbing valve connector according to claim 3, wherein, One end of air bag (7) and first sealing shell (4) are communicated, including: First air hole (602) is arranged on fixed ring (6), and second air hole (401) is arranged on first sealing shell (4);First air pipe (10) is connected between first air hole (602) and second air hole (401) support, and intake portion (703) is sealingly connected with first air pipe (10).

5. A plumbing valve connector according to claim 4, wherein, One end of air bag (7) and second sealing shell (9) are communicated, including: Third air hole is arranged on second sealing shell (9), and third air hole is connected with first air pipe (10) through second air pipe (11), and intake portion (703) is communicated with second sealing shell (9) through first air pipe (10) and second air pipe (11).

6. A plumbing valve connector according to claim 1, wherein One side of first sealing shell (4) and one side of valve seat (1) are sealingly connected through first connecting piece (12).

7. A plumbing valve connector according to claim 3, wherein One side of second sealing shell (9) and the other side of valve seat (1) are sealingly connected through second connecting piece (13).

8. A boiler gas delivery duct structure, characterized by, The pipeline valve connecting piece of any one of claims 1-7 further includes a gas downstream pipeline and a gas upstream pipeline, the gas downstream pipeline is connected with one side of the valve seat, and the gas upstream pipeline is connected with the other side of the valve seat.

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