A water-cooled corrosion-resistant Roots blower

Abstract

The present invention relates to the technical field of fan equipment, and provides a water-cooled corrosion-resistant Roots blower, which includes a fan chamber and an impeller. An air inlet pipe is connected to the top of the fan chamber, and a heat-dissipating water pipe arranged along its axial direction is provided in the inner wall of the fan chamber; a rotating shaft is connected to the middle of the impeller, an air passage is provided in the rotating shaft, a nitrogen storage tank is connected to the tail end of the rotating shaft, and the nitrogen storage tank is communicated with the air passage. An air storage cavity is provided inside the impeller, and a plurality of air outlet holes are arranged on the surface of the impeller at equal intervals along its axial direction. A first passage is provided between the air storage cavity and the air passage, and a second passage is provided between the air storage cavity and the air outlet holes. A one-way air outlet assembly is installed in the air outlet holes, so that the nitrogen storage tank adds compressed nitrogen into the air storage cavity; an anti-corrosion layer is coated on the inner wall of the fan chamber and the surface of the impeller. The present invention improves the corrosion resistance of the blower through cooling and the protection of inert gas, and in cooperation with the anti-corrosion layer.

Description

Technical Field

[0001] The present invention relates to the technical field of fan equipment, and more particularly to a water-cooled corrosion-resistant Roots blower. Background Art

[0002] The principle of a Roots blower is a rotary compressor that uses two lobe-shaped rotors to move relative to each other in a cylinder to compress and transport gas. This type of blower has a simple structure and is easy to manufacture. It is widely used in aquaculture aeration, sewage treatment aeration, cement transportation, and is more suitable for gas transportation and pressurization systems in low-pressure applications. It can also be used as a vacuum pump, etc. Since there are many corrosive gases in industries such as petrochemical, smelting, and fertilizer, when a Roots blower transports corrosive gases, it will corrode the blower.

[0003] Traditional anti-corrosion methods for Roots blowers involve applying an anti-corrosion layer on the inner wall and impeller surface to improve their corrosion resistance. However, when the Roots blower transports corrosive gases such as sulfur dioxide and hydrogen chloride, due to the complex shape of the inner wall of the Roots blower, spraying is difficult, and the anti-corrosion layer coating on the impeller surface may not be uniform enough. There is also a certain amount of wear during operation. During operation, the impeller and the blower cavity will heat up, and the transported corrosive gas will also be heated after being compressed. In a higher temperature environment, the corrosivity of the corrosive gas to the impeller and parts will increase. Under the combined action of the above two situations, local corrosion will still occur on the surface of the impeller, and the service life of the blower will also be shortened. Summary of the Invention

[0004] The purpose of the present invention is to provide a water-cooled corrosion-resistant Roots blower with better heat dissipation and corrosion resistance, and to improve its service life.

[0005] Embodiments of the present invention are achieved through the following technical solutions: A water-cooled corrosion-resistant Roots blower includes a blower cavity and an impeller. An air inlet pipe is connected to the top of the blower cavity, and a heat-dissipating water pipe arranged along its axial direction is provided in the inner wall of the blower cavity. A rotating shaft is connected to the middle of the impeller. An air passage is provided in the rotating shaft. A nitrogen storage tank is connected to the tail end of the rotating shaft, and the nitrogen storage tank communicates with the air passage. An air storage cavity is provided inside the impeller. A plurality of air outlet holes are evenly spaced along its axial direction on the surface of the impeller. A first passage is provided between the air storage cavity and the air passage, and a second passage is provided between the air storage cavity and the air outlet holes. A one-way air outlet assembly is installed in the air outlet holes, so that compressed nitrogen is added from the nitrogen storage tank into the air storage cavity. An anti-corrosion layer is coated on the inner wall of the blower cavity and the surface of the impeller.

[0006] Preferably, one end of the intake pipe is connected with a cooling and dehumidifying mechanism, which includes a heat-insulating barrel and a spiral pipe. Ice-water mixture is stored in the heat-insulating barrel, and the spiral pipe is placed in the heat-insulating barrel. The air outlet end of the spiral pipe is connected with the intake pipe, and the air inlet end of the spiral pipe extends out of the heat-insulating barrel.

[0007] Preferably, a feeding pipe is arranged at the top of the heat-insulating barrel, and the feeding pipe passes through the middle of the spiral pipe and extends to the lower side of the heat-insulating barrel; a baffle is arranged outside the spiral pipe, and the baffles are vertically and evenly spaced along the axis of the spiral pipe. An overflow port is arranged at the upper end of the heat-insulating barrel.

[0008] Preferably, a condensate liquid receiving tank is connected to the air inlet end of the spiral pipe.

[0009] Preferably, a dehumidifier is detachably connected to the intake pipe, and a polar adsorption material is arranged on the inner wall of the dehumidifier. The polar adsorption material adopts molecular sieve.

[0010] Preferably, the one-way air outlet assembly includes a valve body, a cover plate, a spring and a plug. The lower end of the valve body is communicated with the second channel. An air port is opened on the cover plate. The spring is clamped between the plug and the cover plate, and the plug blocks the second channel under the action of elastic force.

[0011] Preferably, a flange for the spring to be sleeved is arranged on one side end face of the cover plate. The plug is of a hemispherical structure, and a conical bottom hole adapted to the plug is arranged inside the valve body.

[0012] Preferably, the impeller is of a two-blade type, and the air outlet holes on both sides of the blades are symmetrically distributed around the axis of the impeller.

[0013] Preferably, the anti-corrosion layer adopts a high molecular ceramic polymer coating.

[0014] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects: Compared with the prior art, in the present invention, while applying an anti-corrosion layer to the fan chamber and the impeller, it has a certain corrosion resistance, and the heat dissipation water pipe can circulate and dissipate heat from the fan chamber that generates heat during operation. At the same time, when the impeller generates heat, the compressed nitrogen will absorb heat and expand, and be discharged from the air outlet holes, mixing between the fan chamber and the impeller. Under the combined action of the heat dissipation water pipe and the compressed nitrogen, the temperature is reduced, the corrosion is reduced, and at the same time, nitrogen is an inert gas and has a protective effect. Description of the Drawings

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the attached drawings required for the embodiments. It should be understood that the following attached drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related attached drawings can also be obtained based on these attached drawings.

[0016] Figure 1 It is a front structural schematic diagram of the water-cooled corrosion-resistant Roots blower provided by the embodiment of the present invention;

[0017] Figure 2 It is a top structural schematic diagram of the water-cooled corrosion-resistant Roots blower in the embodiment of the present invention;

[0018] Figure 3 It is a connection structural schematic diagram of the impeller and the nitrogen storage tank in the present invention;

[0019] Figure 4 It is an internal structural schematic diagram of the blower chamber in the present invention;

[0020] Figure 5 It is a structural schematic diagram of the one-way ventilation component in the present invention.

[0021] Icon: 1 - blower chamber, 11 - heat dissipation water pipe, 2 - impeller, 21 - air storage chamber, 22 - first channel, 23 - air outlet hole, 24 - one-way air outlet component, 241 - valve body, 2411 - conical bottom hole, 242 - cover plate, 2421 - air port, 2422 - flange, 243 - spring, 244 - plug, 25 - second channel, 3 - air inlet pipe, 31 - dehumidifier, 311 - polar adsorption material, 4 - cooling and dehumidifying mechanism, 41 - heat preservation barrel, 411 - overflow port, 42 - spiral pipe, 421 - baffle plate, 43 - feeding pipe, 44 - condensate liquid receiving tank, 5 - rotating shaft, 51 - ventilation cavity, 6 - nitrogen storage tank, 7 - anti-corrosion layer. Specific embodiments

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the attached drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and shown in the attached drawings here can be arranged and designed in various different configurations.

[0023] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0024] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] Embodiment

[0026] The following is further described in conjunction with specific embodiments. Referring to Figures 1 - 5 As shown, this embodiment is a water-cooled corrosion-resistant Roots blower, which includes a blower chamber 1 and an impeller 2. An air inlet pipe 3 is connected to the top of the blower chamber 1, and a heat-dissipating water pipe 11 arranged along its axial direction is provided in the inner wall of the blower chamber 1; a rotating shaft 5 is connected to the middle of the impeller 2, an air passage 51 is provided in the rotating shaft 5, a nitrogen storage tank 6 is connected to the tail end of the rotating shaft 5, and the nitrogen storage tank 6 communicates with the air passage 51. An air storage chamber 21 is provided inside the impeller 2, and a plurality of air outlet holes 23 are uniformly arranged at intervals along its axial direction on the surface of the impeller 2. A first passage 22 is provided between the air storage chamber 21 and the air passage 51, and a second passage 25 is provided between the air storage chamber 21 and the air outlet holes 23. A one-way air outlet assembly 24 is installed in the air outlet holes 23, so that the nitrogen storage tank 6 adds compressed nitrogen into the air storage chamber 21; an anti-corrosion layer 7 is coated on the inner wall of the blower chamber 1 and the surface of the impeller 2; specifically, when the present invention is used to transport corrosive gases such as sulfur dioxide and hydrogen chloride, during the operation of the blower, the blower chamber 1 will get hot. Therefore, the heat-dissipating water pipe 11 is provided to cool the blower chamber 1 in a cycle. In addition, during the rotation of the impeller 2, due to friction and extrusion of the gas, the impeller 2 will also generate heat, and the temperature of the corrosive gas will also rise. The nitrogen storage tank 6 inputs compressed nitrogen into the air passage 51 and enters the air storage chamber 21 along the first passage 22. When the temperature of the impeller 2 rises, the compressed nitrogen in the air storage chamber 21 will absorb heat to cool the impeller 2, and the compressed nitrogen will expand and be discharged from the air outlet holes 23 along the second passage 25. The compressed nitrogen is an inert gas, which fills the space between the blower chamber 1 and the impeller 2 to reduce the corrosion of the corrosive gas on the blower parts and play a role in protecting the impeller 2. Therefore, the blower can obtain a good cooling effect, and at the same time, combined with the anti-corrosion layer 7, its corrosion resistance is better.

[0027] It is worth noting that a pressure relief valve and other devices can be provided in the blower chamber 1 to avoid potential safety hazards caused by excessive internal pressure.

[0028] Referring to Figure 1As shown in the figure, in order to further improve the corrosion resistance of the fan and reduce the water content of the gas entering the fan chamber 1, a cooling and dehumidifying mechanism 4 is connected to one end of the intake pipe 3 in this embodiment. The cooling and dehumidifying mechanism 4 includes a heat preservation barrel 41 and a spiral pipe 42. Ice-water mixture is stored in the heat preservation barrel 41, and the spiral pipe 42 is placed in the heat preservation barrel 41. The air outlet end of the spiral pipe 42 is connected to the intake pipe 3, and the air inlet end of the spiral pipe 42 extends out of the heat preservation barrel 41; specifically, because corrosive gases such as sulfur dioxide are mixed with moisture during transportation, and the sulfurous acid formed by them will contact parts such as the impeller 2. Therefore, before entering the fan chamber 1, such corrosive gases are first passed through the spiral pipe 42. The threaded pipe is made of metal, and soaking it in the ice-water mixture can make its inner wall in a low-temperature state, which can not only pre-cool the gas, but also cause most of the moisture to condense into water on the inner wall of the spiral pipe 42. The corrosive effect of gases such as sulfur dioxide after treatment on entering the fan chamber 1 is greatly reduced. The spiral pipe 42 can increase the contact area with the ice-water mixture and extend the contact time.

[0029] Referring to Figure 1 As shown in the figure, a feeding pipe 43 is provided at the top of the heat preservation barrel 41, and the feeding pipe 43 passes through the middle of the spiral pipe 42 and extends to the lower side of the heat preservation barrel 41; a baffle plate 421 is arranged outside the spiral pipe 42, and the baffle plates 421 are arranged vertically and evenly spaced along the axis of the spiral pipe 42. An overflow port 411 is provided at the upper end of the heat preservation barrel 41; specifically, in order to ensure that the ice-water mixture in the heat preservation barrel 41 remains at a low temperature continuously, crushed ice needs to be added into it irregularly. The crushed ice floats upward from the bottom of the heat preservation barrel 41 and is continuously blocked by the baffle plates 421, so that the spiral pipe 42 can be kept in a uniform low-temperature state. It should be noted that in order to ensure that the crushed ice added to the feeding pipe 43 does not float in the pipe, a piston can be set in the pipe to push the crushed ice out from the bottom. The crushed ice floats upward after entering the heat preservation barrel 41, and when there is too much water in the heat preservation barrel 41, it can be discharged from the overflow port 411.

[0030] In addition, a condensate liquid receiving tank 44 is connected to the air inlet end of the spiral pipe 42. The air inlet end of the spiral pipe 42 is in an inclined state, and the main body of the spiral pipe 42 is kept vertically placed. When the moisture continuously condenses into water, it will flow back along the spiral pipe 42 into the condensate liquid receiving tank 44 for collection.

[0031] Referring to Figure 1 As shown in the figure, in order to further remove the residual water vapor in the transported gas, a dehumidifier 31 is detachably connected to the intake pipe 3. A polar adsorption material 311 is provided on the inner wall of the dehumidifier 31. The polar adsorption material 311 uses molecular sieve, and the molecular sieve has strong water absorption. Under the conditions of relatively high flow rate and low water content, it still has a quite high water absorption capacity, making the water content of the gas before entering the fan chamber 1 lower and the corrosion to the impeller also lower.

[0032] Reference Figure 3 、 Figure 4 and Figure 5 As shown, the unidirectional air outlet assembly 24 includes a valve body 241, a cover plate 242, a spring 243 and a plug 244. The lower end of the valve body 241 is connected to the second channel 25. An air port 2421 is formed on the cover plate 242. The spring 243 is clamped between the plug 244 and the cover plate 242. The plug 244 blocks the second channel 25 under the action of elastic force. Specifically, when the compressed nitrogen absorbs heat and expands, the air pressure acting on the plug 244 will compress the spring 243, and then it can be discharged into the fan chamber 1 from the air port 2421, and the corrosive gas in the fan chamber 1 cannot enter the gas storage chamber 21.

[0033] In addition, a flange 2422 for the spring 243 to be sleeved is provided on one end face of the cover plate 242. The plug 244 is of a hemispherical structure, and a conical bottom hole 2411 adapted to the plug 244 is provided inside the valve body 241. The spring 243, the flange 2422 and the plug 244 are on a straight line. The contact sealing performance between the hemispherical plug 244 and the conical bottom hole 2411 is better.

[0034] Reference Figure 4 As shown, the impeller 2 is of a two-blade type, and the air outlet holes 23 on both sides of the blades are symmetrically distributed about the axis of the impeller 2. The nitrogen discharged from the air outlet holes 23 can more evenly fill the fan chamber 1, avoiding excessive air pressure in a single compartment.

[0035] In addition, the anti-corrosion layer 7 in this embodiment adopts a polymer ceramic polymer coating; specifically, the sulfur dioxide SO2 corrosion-resistant coating KN17 developed by Beijing Naimo Company uses an inorganic-organic interpenetrating network polymer as the film-forming substance, which synergizes with each other, and the coating has better anti-temperature change performance. The coating is flat and saturated. Its main substances are silicon carbide, boron oxide, fine crystal alumina (corundum), ultra-fine zinc oxide, titanium oxide. Using metal powder, with appropriate pigments, solvents, and additives, its characteristics are good composite functions such as anti-corrosion, wear resistance, impact resistance and flexibility, and it is very suitable for use inside the fan.

[0036] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A water-cooled corrosion-resistant Roots blower, comprising a blower chamber (1) and an impeller (2), wherein an air inlet pipe (3) is connected to the top of the blower chamber (1), and it is characterized in that: A heat-dissipating water pipe (11) arranged along the axial direction thereof is provided in the inner wall of the blower chamber (1); A rotating shaft (5) is connected to the middle of the impeller (2). An air vent cavity (51) is provided in the rotating shaft (5). The tail end of the rotating shaft (5) is connected to a nitrogen storage tank (6), and the nitrogen storage tank (6) communicates with the air vent cavity (51). An air storage cavity (21) is provided inside the impeller (2). A plurality of air outlet holes (23) are evenly spaced along the axial direction on the surface of the impeller (2). A first channel (22) is provided between the air storage cavity (21) and the air vent cavity (51). A second channel (25) is provided between the air storage cavity (21) and the air outlet holes (23). And a one-way air outlet assembly (24) is installed in the air outlet holes (23), so that compressed nitrogen is added from the nitrogen storage tank (6) into the air storage cavity (21); An anti-corrosion layer (7) is coated on the inner wall of the blower chamber (1) and the surface of the impeller (2); One end of the air inlet pipe (3) is connected to a temperature reduction and dehumidification mechanism (4). The temperature reduction and dehumidification mechanism (4) includes a heat preservation barrel (41) and a spiral pipe (42). Ice water mixture is stored in the heat preservation barrel (41), and the spiral pipe (42) is placed in the heat preservation barrel (41). The air outlet end of the spiral pipe (42) is connected to the air inlet pipe (3), and the air inlet end of the spiral pipe (42) extends out of the heat preservation barrel (41); A feeding pipe (43) is arranged at the top of the heat preservation barrel (41), and the feeding pipe (43) passes through the middle of the spiral pipe (42) and extends to the lower side of the heat preservation barrel (41); A baffle plate (421) is arranged outside the spiral pipe (42). The baffle plates (421) are evenly spaced vertically along the axis of the spiral pipe (42). An overflow port (411) is provided at the upper end of the heat preservation barrel (41); The air inlet end of the spiral pipe (42) is connected to a condensate liquid receiving tank (44).

2. The water-cooled corrosion-resistant Roots blower according to claim 1, wherein: A dehumidifier (31) is detachably connected to the air inlet pipe (3). A polar adsorption material (311) is arranged on the inner wall of the dehumidifier (31), and the polar adsorption material (311) adopts molecular sieve.

3. The water-cooled corrosion-resistant Roots blower according to claim 1 or 2, characterized in that: The one-way air outlet assembly (24) includes a valve body (241), a cover plate (242), a spring (243) and a plug (244). The lower end of the valve body (241) communicates with the second channel (25). An air port (2421) is opened on the cover plate (242). The spring (243) is clamped between the plug (244) and the cover plate (242), and the plug (244) blocks the second channel (25) under the action of elastic force.

4. The water-cooled corrosion-resistant Roots blower according to claim 3, wherein: A flange (2422) for the spring (243) to be sleeved is provided on one side end face of the cover plate (242). The plug (244) is of a hemispherical structure, and a conical bottom hole (2411) adapted to the plug (244) is provided inside the valve body (241).

5. The water-cooled corrosion-resistant Roots blower according to claim 1, characterized in that: The impeller (2) is of a two-blade type, and the air outlet holes (23) on both sides of the blades are symmetrically distributed about the axis of the impeller (2).

6. The water-cooled corrosion-resistant Roots blower according to claim 1, characterized in that: The anticorrosion layer (7) is made of a polymer ceramic polymer coating.

Images