Split type mixed flow pipe

Abstract

The utility model discloses a split type flow mixing pipe, which comprises a flow mixing pipe arranged in a shell, and is characterized in that the flow mixing pipe comprises a reducing pipe and a diverging pipe which are of a split structure, the air inlet end of the reducing pipe is connected with one end of the shell, the air outlet end of the diverging pipe is connected with the other end of the shell, and the flow mixing pipe is arranged in the shell. The air outlet end of the reducing pipe is inserted into the air inlet end of the increasing pipe, and an annular distance is formed between the inner surface of the air inlet end of the increasing pipe and the outer surface of the air outlet end of the reducing pipe; the air inlet end of the increasing pipe is connected with the air outlet end of the reducing pipe through a connecting piece; a first clamping groove right opposite to the diverging pipe is formed in the outer edge of one side of the connecting piece, a second clamping groove right opposite to the reducing pipe is formed in the outer edge of the other side of the connecting piece, the air inlet end of the diverging pipe is clamped in the first clamping groove, and the air outlet end of the reducing pipe is clamped in the second clamping groove. According to the utility model, the cost is reduced, and the disassembly and assembly convenience is improved.

Description

Technical Field

[0001] The utility model relates to a boiler, in particular to a split type mixed flow tube. Background Art

[0002] At present, the premixer used for gas mixing in the premix boiler generally uses a mixing tube to mix the gas and air when mixing the gas. When mixing, the air passes through the gradually shrinking pipe mouth (converging pipe) and the gradually increasing pipe mouth (expanding pipe), and a negative pressure will be generated at the throat (the smallest diameter), which will suck the gas entering the cavity from the gas inlet into the air flow channel, and the turbulence in the throat will initially mix the air and gas.

[0003] In the prior art, the mixing tube is basically an aluminum casting integrally formed structure, which is heavy and expensive. At the same time, if a certain section or a certain position has a problem, it needs to be disassembled and replaced or repaired as a whole, which is very inconvenient and the replacement cost is relatively high. Therefore, how to solve the above technical problems is the direction that technicians in this field need to work hard on. Summary of the invention

[0004] The utility model aims to provide a split type mixing flow pipe, by using the structure, the convenience of disassembly and assembly is improved, the cost is reduced, and the mixing effect is enhanced.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a split type mixing pipe, comprising a mixing pipe installed in a shell, the mixing pipe comprising a split structure of a converging pipe and a gradually expanding pipe, the air inlet end of the converging pipe is connected to one end of the shell, the air outlet end of the gradually expanding pipe is connected to the other end of the shell, the air outlet end of the converging pipe is inserted into the air inlet end of the gradually expanding pipe, and an annular spacing is formed between the inner surface of the air inlet end of the gradually expanding pipe and the outer surface of the air outlet end of the converging pipe;

[0006] The air inlet end of the gradually expanding tube is connected to the air outlet end of the gradually converging tube via a connecting piece;

[0007] A first slot facing the gradually expanding tube is provided at the outer edge of one side of the connecting piece, and a second slot facing the gradually contracting tube is provided at the outer edge of the other side of the connecting piece. The air inlet end of the gradually expanding tube is clamped in the first slot, and the air outlet end of the gradually contracting tube is clamped in the second slot.

[0008] In the above technical solution, the connecting member is a cross, the first slot is arranged on one end surface of the outer edge of the cross, and the second slot is arranged on the other end surface of the outer edge of the cross.

[0009] In the above technical solution, the shell is a hollow structure with a cavity inside, and the two ends of the cavity are respectively connected to the two ends of the shell; the gradually converging tube and the gradually expanding tube are coaxially arranged with the cavity;

[0010] And / or, the air outlet end of the gradually expanding tube seals one end of the cavity, and the air inlet end of the gradually converging tube seals the other end of the cavity.

[0011] In the above technical solution, a gas inlet is provided on the outer wall of the shell and is connected to the cavity, and the gas inlet is arranged opposite to the connection between the convergent tube and the divergent tube.

[0012] In the above technical solution, the outer diameter of the air inlet end of the convergent tube is larger than the outer diameter of the air outlet end of the convergent tube; the outer diameter of the air inlet end of the divergent tube is smaller than the outer diameter of the air outlet end of the divergent tube.

[0013] In the above technical solution, a first flange is provided at the outer edge of the end of the shell at the air inlet end of the reducer;

[0014] A first annular extension plate extending outward is provided at the outer edge of the air inlet end of the reducer, and a first pressure ring is provided at the outer end surface of the first annular extension plate. The first annular extension plate is arranged between the first flange and the first pressure ring, and the first pressure ring is connected to the first flange by passing through the first annular extension plate via bolts, and the first pressure ring limits the first annular extension plate on the first flange.

[0015] In the above technical solution, a second flange is provided at the outer edge of the outer end surface of the first flange;

[0016] A first annular gap is provided between the outer edge surface of the first annular extension plate and the inner edge surface of the second flange, and a first sealing ring is installed in the first annular gap.

[0017] In the above technical solution, a third flange is provided at the outer edge of the end of the shell at the gas outlet end of the gradually expanding tube;

[0018] A second annular extension plate extending outward is provided at the outer edge of the gas outlet end of the gradually expanding tube.

[0019] A spoiler impeller is provided at the outlet end of the gradually diverging pipe, the second annular extension plate is arranged between the third flange and the spoiler impeller, the outer edge of the spoiler impeller is connected to the third flange through bolts passing through the second annular extension plate, and the spoiler impeller limits the second annular extension plate on the third flange.

[0020] In the above technical solution, a fourth flange is provided at the outer edge of the outer end surface of the third flange;

[0021] A second annular gap is provided between the outer edge surface of the second annular extension plate and the inner edge surface of the fourth flange, and a second sealing ring is installed in the second annular gap.

[0022] In the above technical solution, the gradually converging tube and the gradually expanding tube are made of plastic, stainless steel or cast aluminum;

[0023] And / or, the housing is made of plastic or stainless steel.

[0024] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0025] 1. The converging tube and the expanding tube in the utility model adopt a split structure, and the connection between the two is clamped and limited by the clamping groove of the connecting piece, and the other end is fixed to the shell. In this way, the connecting piece can be used to control the relative position between the converging tube and the expanding tube to ensure the consistency of the channel. In addition, the mixing tube with a split structure is easy to disassemble and assemble, and each component can be repaired and replaced separately, which makes installation, disassembly and maintenance more convenient, and can effectively reduce costs;

[0026] 2. The gas outlet end of the reducer pipe in the utility model is inserted into the gas inlet end of the expander pipe, and there is an annular gap between the inner surface of the gas inlet end of the expander pipe and the outer surface of the gas outlet end of the reducer pipe, and there is a partial overlap between the reducer pipe and the expander pipe, which can prevent the gas from directly entering the throat of the connection between the reducer pipe and the expander pipe from the gap, thereby improving the mixing effect of the gas and the air;

[0027] 3. The mixed flow tube in the utility model can be made of plastic, or stainless steel or cast aluminum which is not easy to generate static electricity, and the cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the first embodiment of the present utility model;

[0029] Figure 2 It is a schematic diagram of the three-dimensional structure in the first embodiment of the utility model;

[0030] Figure 3 It is a schematic cross-sectional view of the structure of the first embodiment of the present utility model;

[0031] Figure 4 yes Figure 3 Local zoom in Figure Ⅰ ;

[0032] Figure 5 yes Figure 3 Local zoom in Figure II ;

[0033] Figure 6 yes Figure 3Local zoom in Figure III .

[0034] Wherein: 1. Shell; 2. Gradually converging tube; 3. Gradually expanding tube; 4. Annular spacing; 5. Connector; 6. First slot; 7. Second slot; 8. Cavity; 9. First flange; 10. First annular extension plate; 11. First pressure ring; 12. Second flange; 13. First sealing ring; 14. Third flange; 15. Second annular extension plate; 16. Turbine impeller; 17. Fourth flange; 18. Second sealing ring; 19. Gas inlet. DETAILED DESCRIPTION

[0035] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0036] Example 1: See Figures 1 to 6 As shown, a split type mixing pipe comprises a mixing pipe installed in a shell 1, the mixing pipe comprises a split structure of a convergent pipe 2 and a divergent pipe 3, the air inlet end of the convergent pipe 2 is connected to one end of the shell 1, the air outlet end of the divergent pipe 3 is connected to the other end of the shell 1, the air outlet end of the convergent pipe 2 is inserted inside the air inlet end of the divergent pipe 3, and an annular spacing 4 is provided between the inner surface of the air inlet end of the divergent pipe 3 and the outer surface of the air outlet end of the convergent pipe 2;

[0037] The air inlet end of the gradually expanding tube 3 is connected to the air outlet end of the gradually converging tube 2 via a connecting piece 5;

[0038] A first clamping groove 6 facing the gradually expanding tube 3 is provided at the outer edge of one side of the connecting member 5, and a second clamping groove 7 facing the gradually contracting tube 2 is provided at the outer edge of the other side of the connecting member 5. The air inlet end of the gradually expanding tube 3 is clamped in the first clamping groove 6, and the air outlet end of the gradually contracting tube 2 is clamped in the second clamping groove 7.

[0039] The converging tube and the expanding tube are made of plastic, stainless steel or cast aluminum; the shell is made of plastic or stainless steel. If stainless steel or cast aluminum is used, it is a material that is not easy to generate static electricity. If plastic is used, it is lighter, which can reduce the weight of the entire boiler and the cost is also lower.

[0040] In this embodiment, the mixing tube is small in the middle and large at both ends. The outer diameter of the inlet end of the convergent tube is larger than the outer diameter of the outlet end of the convergent tube, and the diameter gradually decreases from the inlet end to the outlet end. The outer diameter of the inlet end of the expander tube is smaller than the outer diameter of the outlet end of the expander tube, and the diameter gradually increases from the inlet end to the outlet end. A gas inlet 19 is provided on the outer wall of the shell and communicates with the cavity. The gas inlet is arranged opposite to the connection between the convergent tube and the expander tube. In this embodiment, in actual use, air enters from the air inlet end of the convergent tube, then flows out from the air outlet end, then enters from the air inlet end of the divergent tube, and is sent out from the air outlet end of the divergent tube. Negative pressure will be generated when the air flows through the connection between the convergent tube and the divergent tube. Since there is an annular spacing between the inner surface of the air inlet end of the divergent tube and the outer surface of the air outlet end of the convergent tube, after the gas enters the shell from the gas inlet, it will be sucked into the throat of the mixing tube through this negative pressure and the gas delivery pressure, and then mixed with the air, and then sent out from the air outlet end of the divergent tube, thereby achieving the mixing of gas and air. In the previous structure, a hole will be directly opened in the throat, so that the gas enters the mixing tube from the hole and mixes with the air, which is equivalent to making it contact with the air in a vertical manner. In the original method, the mixing effect is relatively poor. In the present embodiment, there is a partial overlap between the convergent tube and the divergent tube, and an annular spacing is formed. In this way, the gas will enter the interior of the divergent tube from the outer edge of the air inlet end, which is equivalent to entering the divergent tube along the flow direction of the air. The gas is gradually mixed into the air from the outside of the air, so that the mixing effect is stronger.

[0041] At the same time, in this embodiment, the converging tube and the expanding tube are connected by a connecting piece, and a first slot and a second slot are provided on the connecting piece. The expanding tube is inserted into the first slot, and the converging tube is inserted into the second slot. The two are quickly connected and positioned by the connecting piece, and the installation speed is fast, the efficiency is high, the quality is good, and it is also easy to disassemble and assemble. The expanding tube, the converging tube and the connecting piece can be separated by only pulling the expanding tube or the converging tube toward the outer end of the shell. At the same time, by adjusting the depth of the first slot and the second slot (adjusting the slot depth of the first slot and the second slot, or placing a gasket in the first slot and the second slot), the relative position between the converging tube and the expanding tube, that is, the depth of the annular spacing, can be adjusted. At the same time, the coaxiality of the converging tube and the expanding tube can be ensured, thereby ensuring the consistency of the channel of the mixing tube, thereby ensuring that the gas is mixed with the air from the outer edge of this air flow channel, and ensuring the mixing effect.

[0042] See also Figure 3 , 4 As shown, the connecting member 5 is a cross, the first clamping groove 6 is arranged on one end surface of the outer edge of the cross, and the second clamping groove 7 is arranged on the other end surface of the outer edge of the cross.

[0043] According to the angle shown in the figure, taking the case where the gradually expanding tube is above the gradually contracting tube, the first slot is set at the top outer edge of the cross, and the second slot is set at the bottom outer edge of the cross, that is, there are four first slots and four second slots, and each forms a ring-shaped knot. In this way, the connector has a simple structure and does not occupy much of the internal channel of the mixing tube, and does not affect the normal flow of air, thereby ensuring the mixing effect of air and gas.

[0044] See also Figure 3 As shown, the shell 1 is a hollow structure with a cavity 8 inside, and the two ends of the cavity 8 are respectively connected to the two ends of the shell 1; the convergent tube 2 and the divergent tube 3 are coaxially arranged with the cavity 8.

[0045] The gas outlet end of the gradually expanding tube seals one end of the cavity, and the gas inlet end of the gradually contracting tube seals the other end of the cavity.

[0046] This ensures that when the gas enters the shell, it will be in the cavity between the shell inner wall and the gradually expanding tube and the gradually converging tube. It can only enter the mixing tube from the annular distance between the gradually expanding tube and the gradually converging tube to mix with the air.

[0047] See also Figure 3 , 6 As shown, a first flange 9 is provided at the outer edge of the end of the shell 1 at the air inlet end of the reducer 2;

[0048] A first annular extension plate 10 extending outward is provided at the outer edge of the air inlet end of the reducer 2, and a first pressure ring 11 is provided at the outer end surface of the first annular extension plate 10. The first annular extension plate 10 is arranged between the first flange 9 and the first pressure ring 11. The first pressure ring 11 is connected to the first flange 9 by passing through the first annular extension plate 10 with bolts, and the first pressure ring limits the first annular extension plate to the first flange.

[0049] In this embodiment, the first pressure ring and the first flange clamp and limit the first annular extension plate to limit the air inlet end of the reducer, and the air outlet end is limited by the connecting piece and the gradually expanding tube, thereby realizing axial limitation of the reducer.

[0050] See also Figure 3 , 6 As shown, a second flange 12 is provided at the outer edge of the outer end surface of the first flange 9;

[0051] A first annular gap is provided between the outer edge surface of the first annular extension plate and the inner edge surface of the second flange, and a first sealing ring 13 is installed in the first annular gap.

[0052] The first sealing ring is used to block the gap between the first annular extension plate and the first flange, which can prevent the gas in the cavity from escaping and seal the connection between the shell and other connecting parts. The second flange is used to limit the first sealing ring, prevent the first sealing ring from falling, and achieve the limitation of the first sealing ring.

[0053] See also Figure 3 , 5 As shown, a third flange 14 is provided at the outer edge of the end of the shell 1 at the gas outlet end of the gradually expanding pipe 3;

[0054] A second annular extension plate 15 extending outward is provided at the outer edge of the gas outlet end of the gradually expanding pipe 3.

[0055] A spoiler impeller 16 is provided at the outlet end of the gradually diverging pipe 3, and the second annular extension plate 15 is arranged between the third flange 14 and the spoiler impeller 16. The outer edge of the spoiler impeller 16 is connected to the third flange 14 by bolts passing through the second annular extension plate 15, and the spoiler impeller 16 limits the second annular extension plate 15 to the third flange 14.

[0056] In this embodiment, the provision of the turbulent impeller can further mix the air and the gas, thereby improving the mixing effect and ensuring the subsequent safety and stability.

[0057] In this embodiment, the turbulent impeller and the third flange clamp and limit the second annular extension plate, limit the outlet end of the gradually expanding tube, and the inlet end is limited by the connecting piece and the gradually converging tube, thereby realizing the axial limit of the gradually expanding tube. In this structure, the inlet end of the gradually converging tube is limited by the shell, and the outlet end of the gradually expanding tube is limited by the shell. When the air flows, turbulence will be generated, which will cause the throat of the mixing tube to shake. Therefore, the outlet end of the gradually converging tube and the inlet end of the gradually expanding tube are connected and limited by the connecting piece, thereby preventing the throat of the mixing tube from shaking, ensuring the stability and safety of the equipment operation, and ensuring the mixing effect.

[0058] See also Figure 3 , 5 As shown, a fourth flange 17 is provided at the outer edge of the outer end surface of the third flange 14;

[0059] A second annular gap is provided between the outer edge surface of the second annular extension plate and the inner edge surface of the fourth flange, and a second sealing ring 18 is installed in the second annular gap.

[0060] The second sealing ring is used to block the gap between the second annular extension plate and the third flange, which can prevent the gas in the cavity from escaping and seal the connection between the shell and other connecting parts. The fourth flange is used to limit the second sealing ring, prevent the second sealing ring from falling, and achieve the limitation of the second sealing ring.

[0061] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0062] In the present utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or an integral one; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, for example, the two can form a mechanical abutment or abutment connection through abutment, contact, etc., the two can also be directly hung or hung through an intermediate medium, etc., or it can be the internal connection of the two elements or the interaction relationship between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A split type mixing tube, comprising a mixing tube installed in a shell, characterized in that: The mixing tube comprises a split structure of a converging tube and a diverging tube, the inlet end of the converging tube is connected to one end of the shell, the outlet end of the diverging tube is connected to the other end of the shell, the outlet end of the converging tube is inserted inside the inlet end of the diverging tube, and an annular spacing is formed between the inner surface of the inlet end of the diverging tube and the outer surface of the outlet end of the converging tube; The air inlet end of the gradually expanding tube is connected to the air outlet end of the gradually converging tube via a connecting piece; A first slot facing the gradually expanding tube is provided at the outer edge of one side of the connecting piece, and a second slot facing the gradually contracting tube is provided at the outer edge of the other side of the connecting piece. The air inlet end of the gradually expanding tube is clamped in the first slot, and the air outlet end of the gradually contracting tube is clamped in the second slot.

2. The split type mixing tube according to claim 1, characterized in that: The connecting member is a cross, the first clamping groove is arranged on one end surface of the outer edge of the cross, and the second clamping groove is arranged on the other end surface of the outer edge of the cross.

3. The split type mixing tube according to claim 1, characterized in that: The shell is a hollow structure with a cavity inside, and the two ends of the cavity are respectively connected to the two ends of the shell; the gradually converging tube and the gradually expanding tube are coaxially arranged with the cavity; And / or, the air outlet end of the gradually expanding tube seals one end of the cavity, and the air inlet end of the gradually converging tube seals the other end of the cavity.

4. The split type mixing flow tube according to claim 3, characterized in that: A gas inlet is provided on the outer wall of the shell and is in communication with the cavity. The gas inlet is arranged opposite to the connection between the convergent pipe and the divergent pipe.

5. The split type mixing tube according to claim 1, characterized in that: The outer diameter of the air inlet end of the reducer is larger than the outer diameter of the air outlet end of the reducer; the outer diameter of the air inlet end of the expander is smaller than the outer diameter of the air outlet end of the expander.

6. The split type mixing tube according to claim 1, characterized in that: A first flange is provided at the outer edge of the end of the shell at the air inlet end of the reducer; A first annular extension plate extending outward is provided at the outer edge of the air inlet end of the reducer, and a first pressure ring is provided at the outer end surface of the first annular extension plate. The first annular extension plate is arranged between the first flange and the first pressure ring, and the first pressure ring is connected to the first flange by passing through the first annular extension plate via bolts, and the first pressure ring limits the first annular extension plate on the first flange.

7. The split type mixing flow tube according to claim 6, characterized in that: A second flange is provided at the outer edge of the outer end surface of the first flange; A first annular gap is provided between the outer edge surface of the first annular extension plate and the inner edge surface of the second flange, and a first sealing ring is installed in the first annular gap.

8. The split type mixing flow tube according to claim 1, characterized in that: A third flange is provided at the outer edge of the end of the shell at the gas outlet end of the gradually expanding tube; A second annular extension plate extending outward is provided at the outer edge of the gas outlet end of the gradually expanding tube. A spoiler impeller is provided at the outlet end of the gradually diverging pipe, the second annular extension plate is arranged between the third flange and the spoiler impeller, the outer edge of the spoiler impeller is connected to the third flange through bolts passing through the second annular extension plate, and the spoiler impeller limits the second annular extension plate on the third flange.

9. The split type mixing flow tube according to claim 8, characterized in that: A fourth flange is provided at the outer edge of the outer end surface of the third flange; A second annular gap is provided between the outer edge surface of the second annular extension plate and the inner edge surface of the fourth flange, and a second sealing ring is installed in the second annular gap.

10. The split type mixing flow tube according to claim 1, characterized in that: The gradually contracting tube and the gradually expanding tube are made of plastic, stainless steel or cast aluminum; And / or, the housing is made of plastic or stainless steel.

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