High-steam environment centrifugal fan and machine shell structure thereof

Abstract

The utility model discloses a high steam environment centrifugal fan and a shell structure thereof, which comprises a centrifugal fan shell, a variable frequency motor, a variable frequency motor junction box, a forced cooler junction box, a forced cooler, a fan impeller, an internal thread direct connector, an external thread quick connector, a water inlet, a water outlet and a drain outlet, and it is guaranteed that the centrifugal fan shell can be well cooled by cooling water. An independent water inlet and an independent water outlet and a separation outlet after steam condensation are formed. The centrifugal fan is of a frequency conversion structure, and steam can be extracted at the maximum efficiency according to the experimental environment condition. The centrifugal fan is provided with an independent constant-frequency cooler, so that the cooling effect of the fan in a low-frequency working scene is guaranteed.

Description

Technical Field

[0001] The utility model is designed in the technical field of steam environment water vapor separation, and specifically relates to a high steam environment centrifugal fan and a casing structure thereof. Background Art

[0002] Centrifugal fans use high-speed rotating impellers to accelerate the gas. As the impeller rotates, inertial centrifugal force is generated and thrown onto the casing, so the gas pressure inside the casing increases and is finally directed to the air outlet for discharge. Due to the high wind speed, steam is discharged to form water mist, which condenses into water droplets and adheres to the surface of other objects in the workshop. Long-term moisture can easily cause equipment failure, leakage and other safety risks.

[0003] The Chinese patent with the publication number CN213808218U discloses a spindle cooling device for a high-temperature centrifugal fan, including a base and a body, a pillar is fixedly installed on the top of the base, a top plate is fixedly installed on the top of the pillar, a spindle is movably installed on one side of the body, a cooling mechanism is movably connected to the top of the base, a steam collecting mechanism is movably connected to the top and bottom of the top plate, and a water tank is fixedly installed on the top of the base. The device extracts the generated water vapor and inputs the water vapor into the steam collecting box through a steam pipe, so that the water vapor entering the steam collecting box is cooled into water, and the water is discharged into the water tank through a drain pipe to prevent the water vapor from entering the body and causing damage to the fan. However, after the water vapor is extracted, water mist still condenses into water droplets attached to the surfaces of other objects in the workshop. Long-term humidity is likely to cause equipment failure, leakage and other safety risks, and the commonly used extraction devices are noisy and energy-consuming, which affects work efficiency. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a high steam environment centrifugal fan and a casing structure thereof.

[0005] The utility model is realized through the following technical solutions.

[0006] The utility model provides a high steam environment centrifugal fan and its casing structure, including a centrifugal fan casing, a variable frequency motor, a variable frequency motor junction box, a forced cooler junction box, a forced cooler and a fan impeller, the fan impeller is arranged on one side of the centrifugal fan casing, the forced cooler is connected to the forced cooler junction box, the centrifugal fan casing is a double-layer jacket structure, the motor is a variable frequency motor, and one end of the motor is connected to the variable frequency motor junction box, and the motor is connected to the forced cooler.

[0007] Preferably, it comprises a water inlet, a water outlet and a sewage outlet, and inner thread direct connectors and outer thread quick connectors are arranged on the water inlet, the water outlet and the sewage outlet.

[0008] Preferably, the inner wire is made of 304 stainless steel and the thread is one-half.

[0009] Preferably, the external thread quick connector is a corresponding half external thread.

[0010] The beneficial effects of the utility model are: low cost and high exhaust efficiency. The centrifugal fan and casing design effectively achieves the remarkable effects of water vapor separation, noise control and energy saving and consumption reduction. Steam is extracted with maximum efficiency and is equipped with an independent constant frequency cooler to ensure the cooling effect of the fan in low-frequency working scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural explosion diagram of the utility model;

[0012] Figure 2 It is a three-view drawing of the utility model;

[0013] Figure 3 It is a schematic diagram of the cooling water flow inside the casing of the utility model.

[0014] In the figure: 1- centrifugal fan casing; 2- frequency conversion motor; 3- frequency conversion motor junction box; 4- forced cooler junction box; 5- forced cooler; 6- fan impeller; 7- internal thread direct; 8- external thread quick connector; 9- water inlet; 10- water outlet; 11- sewage outlet. DETAILED DESCRIPTION

[0015] The present invention will be further described below with reference to the accompanying drawings and specific examples:

[0016] The technical solution of the utility model is further described below, but the scope of protection required is not limited to the description.

[0017] Example 1

[0018] like Figures 1 to 3As shown, the utility model is a high steam environment centrifugal fan and its casing structure, including a centrifugal fan casing 1, a variable frequency motor 2, a variable frequency motor junction box 3, a forced cooler junction box 4, a forced cooler 5, a fan impeller 6, an inner thread direct 7, an outer thread quick connector 8, a water inlet 9, a water outlet 10 and a sewage outlet 11, the centrifugal fan casing 1 is a double-layer jacket structure, the motor 2 is a variable frequency motor, and one end of the motor 2 is connected to the variable frequency motor junction box 3, and the motor 2 is connected to the forced cooler 5. The double-layer structure of the centrifugal fan casing 1 is relatively closed and independent, and is only connected at the designated design point to ensure that the cooling water can better cool the centrifugal fan casing; the motor 2 is a variable frequency motor, and the variable frequency motor 2 can extract steam with maximum efficiency according to the environmental conditions; and according to the intensity of the steam generated during operation, the motor 2 is controlled in real time by the frequency converter. At this time, the PWM width-modulated wave output by the frequency converter simulates the sinusoidal alternating current containing a large number of harmonics, thereby causing the motor stator copper loss, rotor copper loss, iron loss and additional losses to increase. At the same time, when the power supply frequency is low, the loss caused by the high-order harmonics in the power supply is large, causing the motor to heat up more, so an independent strong cooler 5 is configured to ensure the cooling effect of the motor.

[0019] The forced cooler 5 is connected to the forced cooler junction box 4 to achieve an independent constant frequency power supply, which can stably dissipate heat for the motor 2 working at various frequencies, especially to ensure cooling of the motor 2 at low speed.

[0020] A fan impeller 6 is disposed on one side of the centrifugal fan casing 1. When high-temperature steam enters the centrifugal fan through the ventilation duct, the fan impeller 6 disperses the high-temperature and high-humidity gas onto the inner wall of the casing 1. Due to the large temperature difference, the water vapor quickly condenses into water droplets, which flow along the pipe wall to the bottom of the casing 1 and are finally discharged from the sewage outlet 11.

[0021] The water inlet 9, the water outlet 10 and the sewage outlet 11 are composed of an inner thread direct 7 and an outer thread quick connector 8. It is connected to the external circulating water through a PU air pipe hose, and the specifications of the PU air pipe hose are an outer diameter of 10mm, an inner diameter of 6.5mm, and a pressure resistance of 1MPa; the cooling circulating water enters from the inner water inlet 9, flows into the outer water outlet of the casing 1 after the circulation along the inner water inlet of the casing 1, and then flows out from the water outlet 10. Ensure that the inner wall of the casing 1 has a good low temperature state relative to the steam to enable better condensation. The condensed water is discharged from the sewage outlet 11 connected to the inner wall of the casing 1.

[0022] The inner thread 7 is made of 304 stainless steel, with a size of DN15 and a thread of one-half. It is fully welded on the corresponding inner wall of the casing. This prevents the components from failing due to rust and corrosion. Furthermore, when welding the water inlet and outlet of the casing, argon arc welding is used from the inside to the outside. The welding must ensure air tightness to prevent welding defects such as cold welding and cracks. This has prevented the cooling circulating water of the inner water inlet from entering the impeller cavity of the casing.

[0023] The external thread quick connector 8 is a corresponding half external thread, and the pipe diameter is φ10mm.

[0024] The high-temperature and high-humidity steam test bench sets the heating temperature of the thermostat according to the requirements of the experimental product. The thermostat adjusts the heater to heat the working fluid to the set temperature. At this time, the working fluid will produce a large amount of steam according to the temperature. The high-temperature and high-humidity steam first contacts the steam baffle, where part of the steam turns into water droplets attached to the baffle, and then slides along the baffle into the baffle guide groove and enters the designated collection container;

[0025] Most of the high-temperature and high-humidity steam enters the centrifugal fan casing 1 through the exhaust bellows under the negative pressure of the centrifugal fan during operation, and is thrown to the inner wall of the casing under the action of centrifugal force driven by the rotation of the fan impeller. The variable-frequency motor 2 adjusts the speed through the inverter according to the amount of steam generated during the experiment, and controls the working temperature under the operation of the forced cooler 5. The casing inlet and outlet water channels and the external circulating water are connected through the internal thread direct 7 and the external thread quick connector 8 to ensure the temperature of the inner wall of the casing. The high-temperature and high-humidity steam condenses into water droplets after contacting the inner wall of the casing cooled by the circulating water. The water droplets flow along the inner wall of the casing to the bottom, and then flow into the designated collection container through sewage discharge.

Claims

1. A centrifugal fan for high steam environment and its casing structure, characterized in that: The invention comprises a centrifugal fan casing (1), a variable frequency motor (2), a variable frequency motor junction box (3), a forced cooler junction box (4), a forced cooler (5) and a fan impeller (6), wherein the fan impeller (6) is arranged on one side of the centrifugal fan casing (1), the forced cooler (5) is connected to the forced cooler junction box (4), the centrifugal fan casing (1) is a double-layer jacket structure, the motor (2) is a variable frequency motor, one end of the motor (2) is connected to the variable frequency motor junction box (3), and the motor (2) is connected to the forced cooler (5).

2. A high steam environment centrifugal fan and its casing structure as claimed in claim 1, characterized in that: It comprises a water inlet (9), a water outlet (10) and a sewage outlet (11), and an inner thread joint (7) and an outer thread quick connector (8) are arranged on the water inlet (9), the water outlet (10) and the sewage outlet (11).

3. A high steam environment centrifugal fan and its casing structure as claimed in claim 2, characterized in that: The inner thread (7) is made of 304 stainless steel, and the thread is one-half.

4. A high steam environment centrifugal fan and its casing structure as claimed in claim 2, characterized in that: The external thread quick connector (8) is a corresponding half external thread.

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