High-temperature, high-pressure and low-leakage nuclear-grade fan

Abstract

The utility model discloses a high-temperature high-pressure low-leakage nuclear grade fan which comprises a base, a motor device and a fan body, the fan body is of a vortex fan structure and comprises a machine shell and an impeller, the machine shell is of a split type structure, and the impeller is of a multi-blade structure and is installed in the machine shell. The motor device is arranged between the machine shell and the base and connected with the machine shell and the base, and the motor device is provided with a cooling water circulation channel. The fan adopts a vortex fan structure, so that the air volume is small, and the air pressure is high. A sealing mode of matching a tongue-and-groove concave-convex surface with a high-temperature-resistant annular rubber sealing ring is adopted at a joint where leakage is possible, the sealing ring is arranged in the tongue-and-groove, sealing is performed through pre-tightening pressure of the two convex-and-concave surfaces, the sealing performance is improved, and leakage is avoided. The LED lamp is compact in overall structure, convenient to install, high in reliability, resistant to high temperature and good in heat dissipation performance.

Description

Technical Field

[0001] The utility model relates to the technical field of ventilation equipment, and more specifically to a high-temperature, high-pressure and low-leakage nuclear-grade fan. Background Art

[0002] For centrifugal or vortex fans with motors outside the casing, when the fan is working, the impeller rotates around the central axis at a certain speed, and the air inside the blade channel (the flow channel formed by the blades) is thrown out of the impeller due to the centrifugal force, creating a vacuum in the center of the impeller, and thus the air is sucked in axially from the air inlet. The inhaled air enters the blade channel at the impeller entrance, and gains kinetic energy and pressure energy under the action of the blades. The airflow thrown out of the blade channel enters the casing, and after centralized diversion, it is discharged from the air outlet. At the same time, in this process, because the pressure inside the casing is higher than that outside the casing, radioactive gases will flow out through the gap between the shaft hole and the contact surface between the motor flange and the casing, causing external leakage, which will affect the surrounding environment and reduce the efficiency of the fan.

[0003] The measures in the prior art to prevent leakage outside the casing include: setting a sealing gasket to make the sealing gasket in close contact with the shaft, and using sealing to reduce leakage; setting a drainage groove and a drainage hole in the shaft sealing device, the drainage hole passes through the drainage groove, and is connected to the air inlet through a hose, and using the negative pressure drainage principle, the gas leaked through the gap between the casing and the shaft will flow into the air inlet through the hose, thereby avoiding gas leakage; setting a sealing box on the rear side panel of the casing, one end of the sealing box is sealed and connected to the rear side panel of the casing, and the other end is connected to the bearing box or the motor, forming a fully enclosed space, thereby avoiding gas leakage.

[0004] The above measures to prevent external leakage of the casing have the following disadvantages: for high-temperature and high-pressure media, metal-wound composite gaskets are generally used for sealing gaskets, which have high requirements on the machining accuracy of the sealing gasket contact surface and the uniformity of the clamping force, and may easily cause hidden dangers of large-area leakage; the method of using drainage to transport the leaked gas to the air inlet again, firstly, the negative pressure in the air inlet is significantly higher than the negative pressure in the drainage groove, which will actively guide the gas in the casing to leak into the drainage groove, reducing the efficiency of the fan; setting up a sealing box, which has a complex structure, and at the same time, it is necessary to do a good job in the leakage of the bearing box or the motor shaft, which will increase the cost. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a high-temperature, high-pressure, low-leakage nuclear-grade fan.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-temperature, high-pressure, low-leakage nuclear-grade fan, comprising a base, a motor device and a fan, the fan adopts a vortex fan structure, including a casing and an impeller, the casing adopts a split structure, the impeller adopts a multi-blade structure and is installed in the casing, the motor device is arranged between the casing and the base and is respectively connected to the two, and the motor device is provided with a cooling water circulation channel.

[0007] According to the design principle of the vortex high-pressure pump, the multi-stage boosting effect generated by multiple blades enables it to have the characteristic of achieving extremely high pressure at extremely small flow. Compared with the centrifugal fan with the same size and speed, the present invention can obtain dozens of times the wind pressure. The casing adopts a split type, which is convenient for impeller installation. The fan impeller is composed of dozens of blades, similar to the impeller of a gas turbine, and each blade completes a work on the airflow to increase the fan pressure. In addition, the cooling water circulation enhances the heat dissipation performance of the motor device.

[0008] Furthermore, the housing includes a detachably connected front housing and a rear housing, and the housing is provided with a plurality of heat dissipation ribs arranged at intervals to enhance the structural strength and heat dissipation function. Dozens of heat dissipation ribs with enhanced structural strength and heat dissipation function are distributed on the housing, and have good heat dissipation function.

[0009] Furthermore, the casing is provided with an air inlet and an air outlet, and the connection between the air inlet / air outlet and the pipeline, the front casing and the rear casing, and the connection between the rear casing and the motor device all adopt a tongue-and-groove concave-convex surface matching method.

[0010] Furthermore, a sealing ring is provided in the mortise of the connection. The fan has the possibility of theoretical leakage at only three locations in terms of structure, namely, the connection between the air inlet and outlet and the system pipeline, the connection between the front shell and the rear shell, and the flange connection between the rear shell and the motor seat. For the three connections with the possibility of leakage, a sealing method of combining the convex and concave surfaces of the mortise and tenon with a high-temperature resistant annular rubber sealing ring is adopted. The sealing ring is set in the mortise and tenon, and is sealed by the pre-tightening pressure of the two convex and concave surfaces. In this way, the leakage can reach 10-8Pa.m3 / s.

[0011] Furthermore, the motor device includes a motor base, in which a driving motor is installed, a rotating shaft of the driving motor is connected to the impeller, and two ends of the motor base are respectively connected to the casing and the base.

[0012] Furthermore, the cooling water circulation channel includes a cooling water inlet and a cooling water outlet arranged on the motor base, and a communicating water channel is arranged between the cooling water inlet and the cooling water outlet.

[0013] Furthermore, the housing is directly machined as a whole from stainless steel forgings, without welds, and the inner cavity is designed as a streamlined flow channel, which is machined in one step. The front and rear housings are made of 316L stainless steel forgings, which are machined as a whole after solution treatment to avoid leakage caused by welding defects. The inner cavity of the housing is designed as a streamlined flow channel, which is machined in one step by a machining center to ensure the accuracy of the flow channel, thereby improving the efficiency of the fan and reducing noise.

[0014] Furthermore, several reinforcing ribs are arranged around the base, and anchor bolts connected to the foundation are arranged at the bottom. The fan installation base is welded with 316 stainless steel plates, the upper end is connected to the end cover flange of the motor base, and the lower end bottom plate is connected to the foundation through anchor bolts. Reinforcing ribs are arranged around to ensure that the installation base has sufficient strength to meet the load-bearing requirements.

[0015] The fan casing is made of high-temperature resistant stainless steel, the sealing ring is made of high-temperature resistant rubber, the drive motor bearing uses a special semi-open high-temperature resistant bearing, lubricated with high-temperature resistant grease, the motor frame size is increased, the internal space of the motor housing is increased, and the cast copper rotor and other designs are used to reduce the heat generation of the motor itself. The motor shaft material is made of high-quality stainless steel with high-temperature resistance and high strength. In addition, a water-cooled motor base is used, and the cooling water circulation is used to enhance the heat dissipation performance of the end cover near the motor bearing.

[0016] The impeller is made of stainless steel 316L forgings. After solution treatment, it is integrally processed by a five-axis machining center. After completion, the impeller is subjected to dynamic balancing test and overspeed test to ensure the strength of the impeller and improve the rigidity of the impeller to resist high temperature deformation.

[0017] In summary, the fan of the utility model adopts a vortex fan structure with small air volume and high air pressure. A sealing method of tongue and groove concave and convex surface combined with a high-temperature resistant annular rubber sealing ring is adopted at the connection where leakage may occur. The sealing ring is set in the tongue and groove, and the sealing is performed by the pre-tightening pressure of the two convex and concave surfaces to improve the sealing performance and avoid leakage. The casing also serves as a radioactive pressure boundary component, with high sealing performance, and the temperature of the medium transported is high and can withstand high temperatures. The utility model has the characteristics of compact overall structure, easy installation, high reliability, high temperature resistance and good heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a top view of the structure of the utility model;

[0020] Figure 3 This is a structural diagram of the connection in the utility model;

[0021] Figure 4 A three-dimensional diagram of the structure of the utility model.

[0022] Marking instructions: 1. Front shell; 2. Impeller; 3. Rear shell; 4. Motor base; 5. Cooling water inlet; 6. Base; 7. Reinforcement ribs; 8. Water channel; 9. Cooling water outlet; 10. Sealing ring; 11. Heat dissipation ribs; 12. Air inlet; 13. Air outlet. DETAILED DESCRIPTION

[0023] Reference Figures 1 to 4 The specific implementation method of the high-temperature, high-pressure and low-leakage nuclear-grade fan of the utility model is further described.

[0024] A high-temperature, high-pressure, low-leakage nuclear-grade fan comprises a base 6, a motor device and a fan. The fan adopts a vortex fan structure, including a casing and an impeller 2. The casing adopts a split structure. The impeller 2 adopts a multi-blade structure and is installed in the casing. The motor device is arranged between the casing and the base 6 and is respectively connected to the two. The motor device is provided with a cooling water circulation channel.

[0025] According to the design principle of the vortex high-pressure pump, the multi-stage boosting effect generated by multiple blades is used to achieve extremely high pressure at extremely small flow. Compared with the centrifugal fan with the same size and speed, the present invention can obtain dozens of times the wind pressure. The casing adopts a split type, which is convenient for the installation of the impeller 2. The fan impeller 2 is composed of dozens of blades, similar to the impeller 2 of the gas turbine, and each blade completes a work on the airflow to increase the fan pressure. In addition, the cooling water circulation is used to enhance the heat dissipation performance of the motor device.

[0026] In this embodiment, the housing includes a detachably connected front housing 1 and a rear housing 3, and the housing is provided with a plurality of heat dissipation ribs 11 arranged at intervals to enhance the structural strength and heat dissipation function. Dozens of heat dissipation ribs 11 with enhanced structural strength and heat dissipation function are distributed on the housing, and the housing has a good heat dissipation function.

[0027] In this embodiment, the casing is preferably provided with an air inlet 12 and an air outlet 13, and the connection between the air inlet 12 / air outlet 13 and the pipeline, the connection between the front shell 1 and the rear shell 3, and the connection between the rear shell 3 and the motor device all adopt a tongue-and-groove concave-convex surface matching method.

[0028] In this embodiment, preferably, a sealing ring 10 is provided in the mortise of the connection. The fan has the possibility of theoretical leakage at only three locations in the structure, namely, the connection between the air inlet and outlet 13 and the system pipeline, the connection between the front shell 1 and the rear shell 3, and the flange connection between the rear shell 3 and the motor base 4. For the three connections with the possibility of leakage, a sealing method of the mortise and tenon concave and convex surface with a high temperature resistant annular rubber sealing ring 10 is adopted. The sealing ring 10 is set in the mortise and tenon, and is sealed by the pre-tightening pressure of the two convex and concave surfaces. In this way, the leakage can reach 10-8Pa.m3 / s.

[0029] Preferably, in this embodiment, the motor device includes a motor base 4, in which a driving motor is installed, a rotating shaft of the driving motor is connected to the impeller 2, and two ends of the motor base 4 are respectively connected to the casing and the base 6.

[0030] Preferably, in this embodiment, the cooling water circulation channel includes a cooling water inlet 5 and a cooling water outlet 9 provided on the motor base 4 , and a communicating water channel 8 is provided between the cooling water inlet 5 and the cooling water outlet 9 .

[0031] In this embodiment, the housing is preferably machined as a whole directly from stainless steel forgings without welds, and the inner cavity is designed as a streamlined flow channel, which is machined in one step. The front housing 1 and the rear housing 3 are made of 316L stainless steel forgings, which are machined as a whole after solution treatment to avoid leakage caused by welding defects. The inner cavity of the housing is designed as a streamlined flow channel, which is machined in one step by a machining center to ensure the accuracy of the flow channel, so as to improve the efficiency of the fan and reduce noise.

[0032] In this embodiment, preferably, a plurality of reinforcing ribs 7 are arranged around the base 6, and anchor bolts connected to the foundation are arranged at the bottom. The fan mounting base 6 is welded with 316 stainless steel plates, the upper end is connected to the end cover flange of the motor base 4, the lower end bottom plate is connected to the foundation through anchor bolts, and reinforcing ribs 7 are arranged around to ensure that the mounting base 6 has sufficient strength to meet the load-bearing requirements.

[0033] The fan casing is made of high temperature resistant stainless steel, the sealing ring 10 is made of high temperature resistant rubber, the drive motor bearing uses a special semi-open high temperature resistant bearing, uses high temperature resistant grease for lubrication, increases the motor frame size, increases the internal space of the motor housing, uses cast copper rotors and other designs to reduce the heat generation of the motor itself, and the motor shaft is made of high quality stainless steel with high temperature resistance and high strength. In addition, a water-cooled motor base 4 is used to circulate cooling water to enhance the heat dissipation performance of the end cover near the motor bearing.

[0034] Impeller 2 is made of stainless steel 316L forgings, which are processed as a whole by a five-axis machining center after solid solution treatment. After completion, impeller 2 is subjected to dynamic balancing test and overspeed test to ensure the strength of impeller 2 and improve the rigidity of impeller 2 to resist high temperature deformation.

[0035] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A high temperature, high pressure and low leakage nuclear grade fan, characterized in that: It includes a base, a motor device and a fan, the fan adopts a vortex fan structure, including a casing and an impeller, the casing adopts a split structure, the impeller adopts a multi-blade structure and is installed in the casing, the motor device is arranged between the casing and the base and is respectively connected to the two, and the motor device is provided with a cooling water circulation channel; The housing comprises a detachably connected front housing and a rear housing, and the housing is provided with a plurality of heat dissipation ribs arranged at intervals to enhance the strength of the mechanism and the heat dissipation function; The housing is provided with an air inlet and an air outlet, and the connection between the air inlet / air outlet and the pipeline, the front housing and the rear housing, and the connection between the rear housing and the motor device all adopt a tongue-and-groove concave-convex surface matching method; A sealing ring is arranged in the tongue and groove of the connection.

2. The high temperature, high pressure and low leakage nuclear grade fan according to claim 1 is characterized in that: The motor device comprises a motor base, in which a driving motor is installed, a rotating shaft of the driving motor is connected to the impeller, and two ends of the motor base are respectively connected to the casing and the base.

3. The high temperature, high pressure and low leakage nuclear grade fan according to claim 2 is characterized in that: The cooling water circulation channel includes a cooling water inlet and a cooling water outlet arranged on the motor base, and a communicating water channel is arranged between the cooling water inlet and the cooling water outlet.

4. The high temperature, high pressure and low leakage nuclear grade fan according to claim 1 is characterized in that: The casing is directly machined as a whole from stainless steel forgings without welds, and the inner cavity is designed as a streamlined flow channel, which is formed in one-time processing.

5. The high temperature, high pressure and low leakage nuclear grade fan according to claim 1 is characterized in that: A plurality of reinforcing rib plates are arranged on the periphery of the base, and anchor bolts connected to the foundation are arranged at the bottom.

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