CN201502476U - A cylindrical impulsive hydraulic drive for cooling tower fans - Google Patents

Abstract

The utility model relates to a cylindrical impulsive hydraulic drive for fans of cooling towers, which effectively solves the problems of low energy conversion efficiency, large plane size and mismatching rotational speed of water turbines. The water guide chamber below the chamber is equipped with annular axial guide vanes. The water flow directly enters the guide vanes from the water guide chamber, and then enters the lower turbine chamber in a non-impact inlet way after being changed by the guide vanes. The impulsive turbine is installed in the turbine chamber, and the water flows through After the turbine does work, it is discharged from the water outlet of the draft tube. The diversion chamber, the diversion chamber and the turbine chamber are all of the same diameter and arranged in a cylindrical shape from top to bottom. In the upper combined bearing, the turbine main shaft is directly connected to the fan shaft of the fan. The utility model has unique structure, high efficiency, small size, and light vibration, and is more suitable for installation on industrial cooling towers. It is mainly used to replace the original fan drive motor to To achieve the purpose of energy saving, safety and maintenance reduction.

Description

A cylindrical impulsive hydraulic drive for cooling tower fans

1. Technical field

The utility model relates to a hydrodynamic fan cooling tower, in particular to a cylindrical impulsive hydraulic driver specially used for energy-saving technical transformation of industrial cooling towers or matched with new energy-saving cooling towers.

2. Background technology

In the energy-saving renovation of commonly used industrial cooling towers, a water turbine is used to drive the fan of the cooling tower by using the pressure margin left in the cooling tower water supply and distribution system, which can replace the original fan to drive the motor. To achieve the purpose of energy saving and less maintenance.

At present, the water turbines used in industrial cooling towers are double-click water turbines, Francis water turbines or axial flow water turbines. The working conditions of these types of turbines do not match the cooling tower fan parameters, and there are some shortcomings. Double-click turbines originally work in an unpressurized state. Using the pressurized system of the cooling tower will reduce the energy conversion efficiency of the turbine, and it is prone to vibration when the capacity is large or the water pressure is high. Axial-flow or ordinary Francis turbines generally have relatively high specific speeds, and their speeds are difficult to match with cooling tower fans. A better solution is to use an ultra-low specific speed Francis turbine, which can match the turbine speed with the fan, but the ultra-low specific speed Francis turbine has a large plane size, which affects the airflow channel of the cooling tower. For this reason, it is necessary to overcome the defects of the existing fan hydraulic driving device and develop a new type of cooling tower fan hydraulic driving device with suitable rotating speed, compact structure and small size.

3. Contents of utility model

In view of the above situation, in order to overcome the defects of the existing technology, the utility model provides a special cylindrical impulsive hydraulic drive for cooling tower fans, which can effectively solve the problems of low energy conversion efficiency, large plane size and mismatching rotational speed of hydraulic turbines. The scheme is that it includes a water diversion chamber, a water diversion chamber, a turbine and a main shaft. The water diversion chamber below the water diversion chamber is equipped with an annular axial guide vane. The water flow directly enters the guide vane from the diversion chamber. It enters the turbine chamber at its lower part. The impulsive turbine is installed in the turbine chamber. The water flows through the turbine and is discharged from the outlet of the draft pipe. Cylindrical, the turbine main shaft passes through the upper seal of the turbine chamber and is installed in the upper combined bearing through the upper part of the turbine chamber. The turbine main shaft is directly connected to the fan shaft of the fan. In the water guide chamber, the water flow increases the circulation of the water flow after passing through the water guide room, and enters the turbine evenly along the axial direction. The water flow performs energy conversion in the turbine, turning the water energy into rotational mechanical energy, and drives the cooling tower fan to rotate through the turbine shaft. This kind of hydraulic drive has a cylindrical structure. The upper part of the cylinder is an annular water diversion chamber, and the lower part is equipped with annular axial guide vanes. The water flow directly enters the guide vanes from the water diversion chamber, and then enters the impulsive turbine at the lower part after being changed direction by the guide vanes. , the water flow from the guide vane enters the flow channel of the turbine blade in the way of non-impact inlet, and is discharged through the draft tube after doing work. The water diversion chamber, the water guide chamber and the turbine are all of the same diameter, arranged in a cylindrical shape from top to bottom, so it is called a cylindrical hydraulic drive. The upper part of the worm gear chamber passes through the water diversion chamber and is sealed on the turbine main shaft to install combined bearings, which are directly connected to the fan shaft. The utility model has a unique structure and a novel working principle, which is obviously different from the traditional water turbine. The traditional water turbine has impact type and counterattack type. To do work, the runner is a pressurized system. The turbine of the cylindrical hydraulic driver of the utility model is impulsive, and the impulsive turbine principle of the steam turbine is used for design, so that the turbine not only has the characteristics of the impact type water turbine, but also has the characteristics of the counterattack type water turbine. Working in the system, the water flow enters axially and flows out axially. Therefore, the flow capacity is strong and the size is compact. The turbine blades with large curvature are suitable for the residual pressure and flow conditions of the water supply and distribution system of the cooling tower. The specific speed and unit speed are low, and they have a good match with the fan speed. They are suitable for the power and speed requirements of driving the cooling tower fan. Compared with several existing water turbines used in cooling towers, it has high efficiency, small size and light vibration, and is more suitable for installation on industrial cooling towers. It is mainly used to replace the original fan drive motor to achieve energy saving, safety and maintenance reduction. Purpose. The utility model can also be applied to small hydropower stations.

4. Description of drawings

Fig. 1 is the structural section front view of the utility model

1-water diversion chamber; 2-water diversion chamber; 3-worm gear; 4-turbine chamber and draft tube;

5-main shaft; 6-bearing; 7-seal; 8-fan; 9-water outlet;

10-draft tube

Figure 2 is a perspective view of the annular water conducting chamber

2- water guide chamber

5. Specific implementation

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in detail.

As shown in Figures 1 and 2, the utility model includes a water diversion chamber, a water diversion chamber, a turbine, and a main shaft. The water diversion chamber 2 below the water diversion chamber 1 is equipped with an annular axial guide vane, and the water flow directly enters the guide vane from the diversion chamber. After the guide vane changes direction, it enters the turbine chamber 4 at the lower part in the way of non-impact inlet. The impulsive turbine 3 is installed in the turbine chamber 4. After the water flows through the turbine and does work, it is discharged from the water outlet 9 of the draft tube 10. The water diversion chamber and the water diversion chamber The turbine chambers are all of the same diameter and arranged in a cylindrical shape from top to bottom. The turbine main shaft 5 passes through the water diversion chamber and is installed in the upper combined bearing 6 through the seal 7 on the upper part of the turbine chamber. The fan shaft of the turbine main shaft and the fan 8 is directly even.

In order to ensure the effective use of water flow energy, the water diversion chamber 1 has a circular or rectangular cross-section, which is equal in width and height along the circumferential direction, which is convenient for the upper part of the bearing box; the water diversion chamber 2 is axial, located In the lower part of the chamber, 8 to 12 guide vanes are evenly arranged in the circular water-guiding chamber, and are evenly installed in a ring shape on the inner wall of the ring at the lower part of the water-guiding chamber 1, which play the role of water guiding and forming a water flow circulation; The said turbine 3 is the main working part. In order to ensure that the turbine has a greater working capacity, impulsive blades are used. The number of blades is more, ranging from 9 to 16. There is a large curvature between the inlet and outlet of the blades. The angle difference between the inlet and outlet is 100°～130°; the turbine chamber 4 is a circular cavity, and the water outlet at the lower part of the turbine chamber has the same diameter as the upper mouth of the draft tube, forming an integrated structure, and the draft tube is contracted; Combined bearing 6 is a thrust radial combined bearing.

The water diversion chamber, the water guide chamber and its annular axial guide vanes, the turbine 3, the turbine chamber and the draft pipe constitute the flow system; the turbine 3, the main shaft 5, the seal 7 and the combined bearing 6 constitute the energy transfer system.

The positive contribution of the utility model is:

1. New working principle of hydraulic drive

Existing cooling tower fan hydraulic drives are designed according to the theory of water turbines for power generation, or impact type (double-click type), or counterattack type (mixed flow type), but the utility model adopts the impulsive turbine theory of steam turbines for design, large camber The blade has the characteristics of the impact turbine, and the cylindrical pressurized flow channel has the characteristics of the impact turbine. The combination of the two is the key technology to realize the strong performance of the driver and work efficiently in the pressurized water flow system. It is also a hydraulic drive. There are reasons for low specific speed, low unit speed, and speed matching with the fan.

2. Adopting a unique cylindrical structure

The utility model comprises three kinds of novel unique parts.

(1) Cylindrical runners with equal diameters. The annular water diversion chamber 1, the annular water diversion chamber 2 and the turbine chamber 3 are all of the same diameter, and the upper and lower parts are arranged in a cylindrical shape, the flow channel is smooth, the resistance is small, the structure is compact, and the size is small.

(2) Annular water guide chamber 2. Set up an annular axial water guide mechanism located under the water diversion chamber, with an inlet angle of 30°-45° and an outlet angle of 22°-30° (degrees), so as to ensure that the water flowing out of the guide vane enters the turbine 3 without hitting the inlet. , to achieve efficient energy conversion.

(3) Turbo 3. The turbine, the core part of the drive, is impulsive, not only has a special working principle, but also has a very novel structure. Low, just in line with the cooling tower fan requirements.

Considering the axial load of the cooling tower fan and the axial water thrust formed by the water turbine, the bearing 6 of the special hydraulic driver adopts thrust radial combined bearing.

The beneficial effect of the utility model is to use the technique of the utility model to carry out technical transformation on the traditional cooling tower, replace the original driving motor and transmission mechanism, and achieve the goals of energy saving, environmental protection and less maintenance. It can also form a series of products, which can be matched with new energy-saving cooling towers to make the industrial cooling tower system safer and more efficient.

Compared with the current double-click type and mixed-flow type cooling tower special water turbines, the cylindrical impulse type hydraulic drive of the utility model has obvious advantages in terms of working principle and structural design, and is easy to process and low in cost, which is very effective. A technology with application prospects, its products are highly efficient, small in size, stable in operation, and have huge economic and social benefits.

Claims (7)

1. cylindrical impulse-type hydraulic drive special for fan of cooling tower, include flume, the water guide chamber, turbine and main shaft, it is characterized in that, in the water guide chamber (2) below the flume (1) the ring shaped axial stator is housed, current directly enter stator by flume, after changing direction, stator do not clash into the turbine chamber (4) that the import mode enters its underpart to have, impulsive style turbine (3) is housed in the turbine chamber (4), current are discharged by the water outlet (9) of draft tube (10) after the turbine work done, flume, the water guide chamber, turbine chamber is same diameter, be arranged in cylindric from top to bottom, turbine spindle (5) is in the combination bearing (6) that flume is contained in top is passed in the sealing (7) on turbine chamber top, and the blower fan axle of turbine spindle and blower fan (8) is direct-connected.

2. cylindrical impulse-type hydraulic drive special for fan of cooling tower according to claim 1 is characterized in that, said flume (1) is ring or rectangular cross section, and is along the circumferential direction wide contour.

3. cylindrical impulse-type hydraulic drive special for fan of cooling tower according to claim 1, it is characterized in that, said water guide chamber (2) is an axial type, be positioned at the flume bottom, 8～12 stators are evenly arranged in the circular water guide chamber, and evenly are contained in ringwise on the circle ring inner wall of flume (1) bottom.

4. cylindrical impulse-type hydraulic drive special for fan of cooling tower according to claim 1 is characterized in that, said turbine (3) is the blade of impulsive style, and lobe numbers is 9～16, and importing and exporting differential seat angle between blade is imported and exported is 100 °～130 °.

5. cylindrical impulse-type hydraulic drive special for fan of cooling tower according to claim 1, it is characterized in that said turbine chamber (4) is a circular cavity, turbine chamber bottom water outlet is identical with draft tube upper oral part diameter, constitute integrative-structure, it is contraction-like that draft tube is.

6. cylindrical impulse-type hydraulic drive special for fan of cooling tower according to claim 1 is characterized in that, said combination bearing (6) is the radial thrust combination bearing.

7. cylindrical impulse-type hydraulic drive special for fan of cooling tower according to claim 1 is characterized in that, said flume, water guide chamber and ring shaped axial stator thereof, turbine (3) and turbine chamber and draft tube constituted streaming system; Turbine (3), main shaft (5), sealing (7) and combination bearing (6) constitute energy delivery system.

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