A heat recovery device for a multi-stage vacuum machine

Abstract

The utility model relates to the field of vacuum machine heat recovery, concretely relates to a kind of heat recovery device of multistage vacuum machine, including waste gas pipe, the inner wall of waste gas pipe is connected with inlet pipe and outlet pipe and is fixedly connected to be penetrated, the inside of inlet pipe is provided with drainage mechanism;Spiral pipe, one end of spiral pipe is fixedly connected with the bottom end of inlet pipe, the other end of spiral pipe is fixedly connected with the bottom end of outlet pipe;Heat dissipation mechanism, the heat dissipation mechanism includes spiral fin one, spiral fin one is fixedly connected in the inner camber surface of spiral pipe;The outer camber surface of spiral pipe is fixedly connected with spiral fin two. Through the design of heat dissipation mechanism, not only can increase the effective surface area of spiral pipe, provide more contact interface for spiral pipe and high-temperature waste gas, but also can strengthen airflow disturbance, destroy spiral pipe thermal boundary layer, significantly improve the overall heat exchange efficiency of spiral pipe, so that the heat energy contained in high-temperature waste gas can be fully extracted and utilized.

Description

Technical Field

[0001] This utility model relates to the field of heat recovery for vacuum machines, specifically to a heat recovery device for a multi-stage vacuum machine. Background Technology

[0002] A multistage vacuum machine is a key industrial equipment that uses the principle of steam jet to create a high vacuum environment. It compresses and pumps gas in stages by connecting multiple steam jet pumps in series, and is widely used in evaporation, concentration and drying processes in industries such as chemical, pharmaceutical and food.

[0003] Currently, the common method for treating high-temperature exhaust gas from multi-stage vacuum machines is to install a condenser at the end to recover heat from the exhaust gas. However, most condensers on the market use cooling water flowing inside the condenser tubes, with the outer surface in contact with the high-temperature exhaust gas. Heat exchange is achieved through heat conduction in the condenser tubes. However, the surface area of ​​the condenser tubes is limited, so their heat exchange efficiency is limited. The latent heat and sensible heat in the high-temperature exhaust gas cannot be fully recovered and utilized, and the heat recovery efficiency needs to be improved.

[0004] Therefore, it is necessary to invent a heat recovery device for a multi-stage vacuum machine to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a heat recovery device for a multi-stage vacuum machine. By tightly winding spiral fins one and two around the inner and outer arc surfaces of the spiral tube, the effective surface area of ​​the spiral tube can be significantly increased, providing more contact interfaces between the spiral tube and the high-temperature exhaust gas, thereby improving the overall heat exchange efficiency of the spiral tube and enabling the heat energy contained in the high-temperature exhaust gas to be fully extracted and utilized. This solves the problem of low heat exchange efficiency caused by limited surface area.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a heat recovery device for a multi-stage vacuum machine, comprising: An exhaust pipe, wherein an inlet pipe and an outlet pipe are fixedly connected through the inner wall of the exhaust pipe, and a flow-draining mechanism is provided inside the inlet pipe; A spiral tube, one end of which is fixedly connected to the bottom end of an inlet pipe, and the other end of which is fixedly connected to the bottom end of an outlet pipe; The heat dissipation mechanism includes a first spiral fin, which is fixedly connected to the inner arc surface of a spiral tube; a second spiral fin is fixedly connected to the outer arc surface of the spiral tube, and ventilation holes are provided on both the first and second spiral fins.

[0007] Preferably, the drainage mechanism includes a collar, which is fixedly connected to the inner wall of the inlet pipe, and a spiral drainage plate is fixedly connected to the bottom of the collar.

[0008] Preferably, a support rod is fixedly connected to the inner wall of the collar, and a conical block is fixedly connected to the end of the support rod away from the inner wall of the collar.

[0009] Preferably, the diameter of the conical block gradually increases from top to bottom, and the conical block and the collar are coaxial.

[0010] The technical effects and advantages provided by this utility model in the above technical solution are as follows: This invention, through the design of the heat dissipation mechanism, not only increases the effective surface area of ​​the spiral tube, providing more contact interfaces between the spiral tube and the high-temperature exhaust gas, but also enhances airflow turbulence and disrupts the thermal boundary layer of the spiral tube, significantly improving the overall heat exchange efficiency of the spiral tube and enabling the full extraction and utilization of the heat energy contained in the high-temperature exhaust gas. Furthermore, the design of the turbulence mechanism enhances the turbulence effect of the cooling water, thereby disrupting the thermal boundary layer on the inner wall of the spiral tube and further improving its heat exchange efficiency. This allows for a further increase in the cooling water flow rate to accelerate hot water production efficiency. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the exhaust pipe of this utility model; Figure 3 This is a schematic diagram of the overall structure of the spiral tube of this utility model; Figure 4 This utility model Figure 3 A schematic diagram of the exploded structure; Figure 5 This is a schematic diagram of the overall structure of the drainage mechanism of this utility model.

[0013] Legend: 1. Exhaust pipe; 2. Spiral tube; 3. Heat dissipation mechanism; 31. Spiral fin one; 32. Spiral fin two; 33. Ventilation hole; 4. Liquid inlet pipe; 5. Liquid outlet pipe; 6. Drainage mechanism; 61. Collar; 62. Spiral drainage plate; 63. Support rod; 64. Conical block. Detailed Implementation

[0014] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0015] This utility model provides, for example Figure 1 - Figure 3 The heat recovery device of a multi-stage vacuum machine shown includes an exhaust pipe 1, a spiral pipe 2 and a heat dissipation mechanism 3; The inner wall of the exhaust pipe 1 is connected to an inlet pipe 4 and an outlet pipe 5. The inlet pipe 4 is used to inject cooling water into the spiral pipe 2, and the outlet pipe 5 is used to discharge the heated cooling water inside the spiral pipe 2. The inlet pipe 4 is equipped with a diversion mechanism 6. One end of the spiral tube 2 is fixedly connected to the bottom end of the inlet pipe 4, and the other end of the spiral tube 2 is fixedly connected to the bottom end of the outlet pipe 5. Cooling water is injected into the interior of the inlet pipe 4, so that the cooling water enters the interior of the spiral tube 2 through the inlet pipe 4. The spiral tube 2 in a spiral state can prolong the residence time of the cooling water inside the exhaust pipe 1, so that the cooling water can be fully heated. The heated cooling water will be discharged outward through the outlet pipe 5. The heated cooling water is transported to various links that require heat through the outlet pipe 5 for use, so that the heat energy of the multi-stage vacuum machine can be recovered and utilized. like Figure 2 - Figure 4 As shown, the heat dissipation mechanism 3 includes a spiral fin 31, which is fixedly connected to the inner arc surface of the spiral tube 2. A spiral fin 32 is fixedly connected to the outer arc surface of the spiral tube 2. By tightly winding the spiral fins 31 and 32 around the inner and outer arc surfaces of the spiral tube 2, the effective surface area of ​​the spiral tube 2 can be significantly increased, providing more contact interfaces between the spiral tube 2 and the high-temperature exhaust gas, thereby improving the heat exchange efficiency of the spiral tube 2. Ventilation holes 33 are provided on both the spiral fins 31 and 32. The design of the ventilation holes 33 can ensure that the high-temperature exhaust gas flows smoothly in the exhaust pipe 1, avoiding excessive local resistance or the generation of airflow dead zones, and further ensuring the stability and efficiency of the heat exchange process.

[0016] like Figure 2 , Figure 4 and Figure 5 As shown, the flow guiding mechanism 6 includes a collar 61, which is fixedly connected to the inner wall of the inlet pipe 4. A spiral flow guiding plate 62 is fixedly connected to the bottom of the collar 61. The spiral structure of the spiral flow guiding plate 62 allows the cooling water to flow downward in a spiral state inside the inlet pipe 4. This spiral flow state can significantly improve the turbulence effect of the cooling water. A support rod 63 is fixedly connected to the inner wall of the collar 61. The collar 61 and the support rod 63 can provide support for the conical block 64. The end of the support rod 63 away from the inner wall of the collar 61 is fixedly connected to the conical block 64. The diameter of the conical block 64 gradually increases from top to bottom. The conical block 64 and the collar 61 are in a coaxial state. When the cooling water is injected into the interior of the inlet pipe 4, the cooling water will enter the gap between two adjacent spiral flow guiding plates 62 under the guidance of the conical block 64.

[0017] The working principle of this practical system is as follows: The exhaust gas generated by the operation of the multi-stage vacuum machine is injected into the interior of the exhaust pipe 1 through the right end of the exhaust pipe 1. At the same time, cooling water is injected into the interior of the liquid inlet pipe 4, so that the cooling water enters the interior of the spiral tube 2 through the liquid inlet pipe 4. At this time, the high temperature of the exhaust gas inside the exhaust pipe 1 will heat the spiral tube 2, causing the cooling water inside to gradually heat up. The spiral tube 2 in a spiral state can prolong the residence time of the cooling water inside the exhaust pipe 1, so that the cooling water can be fully heated. The heated cooling water inside the spiral tube 2 will be discharged out through the liquid outlet pipe 5. The heated cooling water is then transported to various stages that require heat for use through the liquid outlet pipe 5, while the cooled exhaust gas continues to enter the next stage vacuum pump or is finally discharged.

[0018] By tightly winding spiral fins 31 and 32 around the inner and outer arc surfaces of the spiral tube 2, the effective surface area of ​​the spiral tube 2 can be significantly increased, providing more contact interfaces between the spiral tube 2 and the high-temperature exhaust gas. When the high-temperature exhaust gas flows into the exhaust gas pipe 1, the spiral fins 31 and 32 can enhance airflow disturbance and destroy the thermal boundary layer of the spiral tube 2. Through synergistic effect, the overall heat exchange efficiency of the spiral tube 2 is significantly improved, so that the heat energy contained in the high-temperature exhaust gas can be fully extracted and utilized. The improved heat exchange efficiency of the spiral tube 2 can accelerate the cooling water flow rate, thereby improving the hot water production efficiency and transporting it to the required stage.

[0019] When cooling water is injected into the inlet pipe 4, it will enter the gap between two adjacent spiral guide vanes 62 under the guidance of the conical block 64. At this time, the cooling water inside the inlet pipe 4 will flow downward along the surface of the spiral guide vanes 62. The spiral structure of the spiral guide vanes 62 allows the cooling water to flow downward in a spiral state inside the inlet pipe 4. This spiral flow state can significantly improve the turbulence effect of the cooling water, thereby breaking the thermal boundary layer on the inner wall of the spiral tube 2 and further improving the heat exchange efficiency of the spiral tube 2. This can further increase the cooling water flow rate to accelerate the hot water production efficiency.

[0020] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A heat recovery device for a multi-stage vacuum machine, characterized in that, include: The exhaust pipe (1) has an inlet pipe (4) and an outlet pipe (5) that are connected through and fixed to the inner wall of the exhaust pipe (1). The inlet pipe (4) is provided with a drainage mechanism (6). Spiral tube (2), one end of which is fixedly connected to the bottom end of the inlet pipe (4), and the other end of which is fixedly connected to the bottom end of the outlet pipe (5); The heat dissipation mechanism (3) includes a spiral fin one (31), which is fixedly connected to the inner arc surface of the spiral tube (2); a spiral fin two (32) is fixedly connected to the outer arc surface of the spiral tube (2), and ventilation holes (33) are provided on both the spiral fin one (31) and the spiral fin two (32).

2. The heat recovery device for a multi-stage vacuum machine according to claim 1, characterized in that: The drainage mechanism (6) includes a collar (61), which is fixedly connected to the inner wall of the liquid inlet pipe (4), and a spiral drainage plate (62) is fixedly connected to the bottom of the collar (61).

3. The heat recovery device for a multi-stage vacuum machine according to claim 2, characterized in that: A support rod (63) is fixedly connected to the inner wall of the collar (61), and a conical block (64) is fixedly connected to one end of the support rod (63) away from the inner wall of the collar (61).

4. The heat recovery device for a multi-stage vacuum machine according to claim 3, characterized in that: The diameter of the conical block (64) gradually increases from top to bottom, and the conical block (64) and the collar (61) are coaxial.

Images