# Impeller for directly connected low-speed small hydraulic turbine of diagonal type used in hydrodynamic power-saving cooling tower

FIELD: machine building.

SUBSTANCE: invention relates to an impeller for a directly connected low-speed small hydraulic turbine of diagonal type, used in a hydrodynamic power-saving cooling tower, which comprises an upper crown, a lower ring and blades with bent surface, installed between the upper crown and the lower ring. The ratio of the height h of the edge 4 of water inlet of each blade to the diameter D1, corresponding to the edge 4 of water inlet makes 0.18-0.22. The ratio of the total height of blades H to the diameter D1 makes 0.35-0.42. The ratio of the diameter D2, corresponding to the point A of crossing of each edge 4 of the water outlet and the lower ring, to the diameter D1 makes 0.4-0.6. The ratio of the diameter D3, corresponding to the point B of crossing of each edge 4 of water inlet and the upper crown to the diameter D1 makes 0.3-0.45. The ratio of the diameter D4 in the position of the round platform of water drainage on the upper crown to the diameter D1 makes 0.1-0.2. The diameter D1 and frequency of rotation of cooling fan blades are related according to certain dependence.

EFFECT: provision of simple design, convenience in development and installation and high efficiency of energy conversion.

2 cl, 4 dwg

The technical field to which the invention relates.

The invention relates to a cooling tower, in particular to the impeller turbines, to bring the cooling tower, more specifically, in the invention described impeller directly connected low-speed small hydro diagonal type used in hydrodynamic energy-saving cooling tower, which is not provided with gear and can ensure the equality of the output rotational speed of the turbine of the nominal value of the fan speed through proper design of the impeller turbines to eliminate the gearbox used traditional neprosteno the turbine.

Background of invention

As we all know, for the purpose of the energy conservation in existing cooling tower air conditioning started to use the turbine to bring the cooling fan, thus, completely disposing of the energy circulation flow water cooling towers for energy conversion in the driving force of the turbine; the turbine is used to convert the energy of water into mechanical energy of rotation to bring the cooling fan, thus eliminating the traditional cooling the engine of great power osushestvlyae very significant effect of energy conservation.

At the moment the water column redundant industrial circulating water cooling towers of air-conditioning in China is 4-15 m, and discharge the water column at 0.5-1 m is required in the regulations for the distribution of water pipes to the turbine to remove part of the water column redundant circulating water worked in the environment with backpressure, but the fan speed of the cooling tower must be below to make a direct connection with fan cooling towers, and for this purpose must be selected low-speed turbine diagonal type; however, in the current range of turbines in China is still missing low-speed turbine diagonal type that may be tailored to the working environment and to be directly connected to the cooling fan, and should be accepted mode of reduction for the connection of conventional turbines diagonal type with fan cooling tower through the gearbox, since the operating conditions of the gearbox are worse not only because of the strong noise and short service life, but also because of the corresponding increase in production costs. Therefore, the designed turbine is of diagonal type, which can match the speed to the conditions of the working environment is Reda and can be directly connected to the fan of the cooling tower, thus, having great practical significance.

Summary of the invention

The present invention is to develop a working wheel for directly connected low-speed small hydro diagonal type used in hydrodynamic energy-saving cooling tower, overcoming the problem lies in the fact that the output shaft of the existing turbines cooling tower may cause fan blades only through the reduction gear, as well as problems of high noise, high probability of failure and high production costs, therefore, as a basis for ultimately eliminate the transfer mechanism with gear.

The technical scheme of the invention is as follows:

The impeller is directly connected low-speed small hydro diagonal type used in hydrodynamic energy-saving cooling tower, contains the upper crown 1, the lower ring 3 and the blade 2 with curved surface, installed between the upper crown 1 and the bottom ring 3, and region 4 water inlet is located at one end of each blade 2 with curved surface, and each edge 4 water inlet is a party to the high pressure impeller and also side of the radial inflow of the stream of water, and the edge 5 of the water output is the other end of each blade 2 with curved surface,
and each edge 5 of the water output is the low-pressure side of the impeller and also party axial inward flow of water; a connection point between the edges of the 5th year of the water and the bottom ring 2 are a and a connection point between the edges of the 5th year of the water and the top of the crown are In, and the impeller is characterized by the fact that the ratio of the height h of each region 4 water inlet to the diameter D1 corresponding to the edge 4 of the inlet water is 0,18-0,22. the ratio of the total height H of the blades 2 to the diameter D1 is 0,35-0,42, the ratio of the diameter D2 corresponding to the intersection point A of each end of the 5th year of the water and the lower ring 3, the diameter D1 is 0.4 to 0.6, the ratio of the diameter D3 corresponding to the point B of intersection of each edge 4 water inlet and the top of the crown, the diameter D1 is 0.3-0.45 respectively, and the ratio of the diameter D4 in the position of discharge of water round the platform on the top of the crown 1 to the diameter D1 of 0.1-0.2, and the ratio between the diameter D1 of each edge of the inlet water and the frequency of rotation of the blades the cooling fan is

The number of blades 2 with curved surface is 16-20, and the ratio of the minimum thickness to the maximum thickness of the pterygoid forms of the blades is of 0.28-0.34 in.

The invention has the following advantages:

The invention can provide the basis for in order to eliminate the gearbox for the turbines for the cooling tower, through the use of the impeller, designed in the invention, and can be completely satisfied with job demands, and experiments prove that the output speed of the turbine, equipped with impeller, can fully meet operational requirements, and the range of pulsation frequencies of rotation is reduced.

The design is simple, and the installation and use is very convenient.

In regard to the characteristics of the turbines for the cooling tower shows the frequency n11 rotation mainly reduced to the level of not less than 80 during the existing conventional neprosteno turbines, to 28-42; simultaneously, the equation of the curve key elements, namely, guide blades, which can affect the efficiency of the turbine, defined according to the given speed, and the relationship between the size of the impeller and razmara the edges D1 of the water inlet of the blades is obtained from a variety of calculations and experiments, and at the same time it turns out the relationship between D1 and rotation speed of the cooling fan, thus providing a fast and convenient way reasonable design of the impeller.

The experiments show that while the above speed is 28-42, a certain amount D1 of the edges of the water inlet vanes and a certain amount of the impeller can save the overall efficiency of the turbine at about 86%, and when given the speed more than 42 or less than 28, the efficiency sharply falls linearly.

Brief description of drawings

Figure 1 is a schematic view of the spatial structure of the impeller according to the invention.

Figure 2 is a schematic diagram of the dimensions of all parts of the impeller according to the invention.

Figure 3 is a schematic view of the blade with the curved surface according to the invention.

Figure 4 is a drawing in three dimensions with blades curved surface according to the invention.

Detailed description of embodiments of the present invention

Next is a detailed description of the invention through a combination of drawings and descriptions of option exercise. As can be seen from figure 2, the impeller is directly connected low-speed small hydro diagonal t is PA,
used in hydrodynamic energy-saving cooling tower, contains the upper crown 1, the lower ring 3 and 16-20 blades 2 with curved surface, installed between the upper crown 1 and the bottom ring 3, as can be seen from figure 1 and the blade 2 with curved surface have a wing-shaped structure, as can be seen from figure 3 and figure 4, and the ratio of the minimum thickness to the maximum thickness of the pterygoid forms of blades is 0,28-0,34, and region 4 water inlet is located at one end of each blade 2 with curved surface, and each edge 4 water inlet is a party to the high pressure impeller and also side of the radial inflow of the stream of water, and the edge 5 of the water output is located at the other end of each blade 2 with curved surface, and each edge of the water output is the low-pressure side of the impeller and also a party to the axial outflow of water flow; and the point A are the connection points between the edges 5 of the release of water and a lower ring 3, and the point B are points of connection between the edges of the 5th year of the water and the top of the crown, and the ratio of the minimum thickness to the maximum thickness of the pterygoid forms of blades with curved surface is 0,28-0,34, and the relationship between the size of the blades 2 with curved surface and the sizes of the respective parts of all the impeller SL is blowing: the ratio of the height h of each region 4 water inlet to the diameter D1.
the corresponding edge of the 4 water inlet is 0,18-0,22, the ratio of the total height H of the blades 2 to the diameter D1 is 0,35-0,42, the ratio of the diameter D2 corresponding to the intersection point A of each end of the 5th year of the water and the lower ring 3, the diameter D1 is 0.4 to 0.6, the ratio of the diameter D3 corresponding to the point of intersection of each edge 4 water inlet and the top of the crown, the diameter D1 is 0.3-0.45 respectively, and the ratio of the diameter D4 in the position of discharge of water round the platform on the top of the crown 1 to the diameter D1 of 0.1-0.2, as seen of figure 2. The ratio between the diameter D1 of each edge of the inlet water and the frequency of rotation of the blades of the cooling fan is

In a specific embodiment, when the frequency of rotation of the fan blades of the cooling tower is determined, next, select the value of n11 according to the environment when using, in essence, the selected value is higher in the South and in the North the selected value is less than, greater is nste situations suitable chosen value 35, then the value of D1 may be determined by the pressure of the N intake of water, and the dimensions of all parts, namely, blades with curved surface, the upper crown and the lower ring finally determined according to the value of D1, thereby causing the impeller in accordance with the requirement of the nominal speed.

What follows is a description of several specific examples of calculations:

Example 1

Suppose that n11 is equal to 35, the pressure of the N intake of water is 14 m and the nominal frequency n of rotation of the fan is equal to 136 rpm, then D1 is equal to 0.928 m, and one blade with curved shape is designed in the form shown in figure 3 and 4. Indeed the measured rotation speed of the set of fan blades is equal to 137 rpm, which corresponds to the design requirement.

Example 2

Suppose that n11 is equal to 30, the pressure of the N intake of water is 15 m and the nominal frequency n of rotation of the fan is equal to 140 rpm, then D1 is equal 0,830 m, and one blade with curved shape is designed in the form shown in figure 3 and 4. Indeed the measured rotation speed of the set of fan blades is equal to 138 rpm, which corresponds to the design requirement.

Example 3

Suppose that n11 is equal to 40, the pressure of the N intake of water is 15 m and the nominal frequency n of rotation of the fan is equal to 130 rpm, then D1 is equal 1,192 m, and one blade with isign is a form designed in the form, shown in figure 3 and 4. Indeed the measured rotational speed of the installed fan blades 131 rpm, which corresponds to the design requirement.

Example 4

Suppose that n11 is equal to 28, the pressure H water inlet is 13 m and the nominal frequency n of rotation of the fan is equal to 136 rpm, then D1 is equal 0,742 m, and one blade with curved shape is designed in the form shown in figure 3 and 4. Indeed the measured rotation speed of the set of fan blades is equal to 130 rpm, which corresponds to the design requirement.

Example 5

Suppose that n11 is equal to 42, the pressure of the N intake of water is 10 m and the nominal frequency n of rotation of the fan is equal to 140 rpm, then D1 is equal 0,949 m, and one blade with curved shape is designed in the form shown in figure 3 and 4. Indeed the measured rotation speed of the set of fan blades is equal to 145 rpm, which corresponds to the design requirement.

Example 6

Suppose that n11 is equal to 27, the pressure H water inlet is 13 m and the nominal frequency n of rotation of the fan is equal to 136 rpm, then D1 is equal 0,712 m, and one blade with curved shape is designed in the form shown in figure 3 and 4. Indeed the measured rotation speed of the set of fan blades is equal to 110 rpm, which does not meet the design requirement.

Example 7

Suppose that n11 is equal to 43, pressure N intake water is 10 m and the nominal frequency n of rotation of the fan is equal to 140 rpm, then D1 is equal 0,969 m, and one blade with curved shape is designed in the form shown in figure 3 and 4. Indeed the measured rotation speed of the set of fan blades is equal to 120 rpm, which does not meet the design requirement.

For specialists in the art will understand that the wooden template can be obtained very simply by appealing to the respect of all parameters between the blades and the impeller, as well as to the relationship between the diameter of the edge of the water inlet of each blade and the present rotational speed, and between the water column and the frequency of rotation of the fan blades, and, therefore, can be obtained perfect design through the development after the immediate or small finishing wooden template.

Missing parts are the same as in the prior art or can be met through borrowings prior art.

1. The impeller is directly connected low-speed small hydro diagonal type used in hydrodynamic energy-saving cooling tower containing the upper crown (1), the lower ring (3) and the blade (2) with a curved surface, set the s between the upper crown (1) and lower ring (3),
moreover, the edge (4) of the water inlet is located at one end of each blade (2) with a curved surface, and each edge (4) of the water inlet is a party to the high pressure impeller and also side of the radial inflow of the stream of water, and the edge (5) release of water is located at the other end of each blade (2) with a curved surface, and each edge of the water output is the low-pressure side of the impeller and also a party to the axial outflow of water flow; and a connection point between the edges (5) release of water and a lower ring (2) are A, a connection point between the edges (5) release of water and the top of the crown are B, characterized in that the ratio of the height h of the edge (4) of the water inlet of each blade (2) to the diameter D1 corresponding to the edge (4) water inlet is 0,18-0,22, the ratio of the total height H of the blades (2) to the diameter D1 is 0,35-0,42, the ratio of the diameter D2 corresponding to the point A of intersection of each edge (5) release of water and the lower ring (3), the diameter D1 is 0.4 to 0.6, the ratio of the diameter D3, corresponding to the point B of intersection of each edge (5) release of water and the top of the crown, the diameter D1 is 0.3-0.45, and the ratio of the diameter D4 in the position of discharge of water round the platform on the upper crown (1) to the diameter D1 of 0.1-0.2 and the ratio between the diameter D1 and the rotational speed of the blades of the cooling fan is

2. The impeller according to claim 1, characterized in that the number of blades (2) with a curved surface is 16-20, and the ratio of the minimum thickness to the maximum thickness of the pterygoid forms of the blades is of 0.28-0.34 in.

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