CN104048552B - For cooling tower anti-wall flow shower nozzle - Google Patents

Abstract

The invention relates to a nozzle for cooling tower wall-defense flow. The upper part of the fixed sleeve is fixedly connected with the water distribution pipe, and the lower part is positioned and fixedly connected with the water inlet at the upper end of the nozzle main body. There is a back water baffle, and in the middle of the back water baffle, four splash boards are sequentially arranged from top to bottom, and each splash board is provided with a sawtooth edge of the splash board. The spraying area of the nozzle is semicircle, and a circle of anti-wall flow nozzles is arranged directly above the edge of the cooling tower packing, and the position of the nozzle is fixed so that the spraying area falls on the packing. The combination of the two nozzles can effectively reduce the generation of wall flow , At the same time, it can avoid the problem of no spray water in some areas of the filler due to the change of the flow rate of the nozzle. The invention can avoid the occurrence of wall flow, even if the flow rate changes, there will be no wall flow, the possibility of no spray water area is greatly reduced, the overall spray is more uniform, and the cooling capacity of the tower is obviously improved.

Description

For cooling tower wall flow sprinkler

technical field

The invention relates to a spray head of a cooling tower, in particular to a spray head for preventing wall flow.

Background technique

The cooling tower industry has developed well in China and has been widely used in national life and industrial production. According to the contact mode between cooling water and air, it can be divided into open cooling tower and closed cooling tower, referred to as open tower and closed tower, whether it is The main heat dissipation methods of open tower or closed tower include contact heat dissipation and evaporative heat dissipation, among which evaporative heat dissipation is dominant.

The quality of the spraying effect is an important factor determining the cooling capacity of the cooling tower. The generation of wall flow will reduce the cooling effect of the cooling tower. The spray water along the wall does not participate in the heat dissipation of the filler, and basically does not get cooled. , and the power of the pump is consumed during the reciprocating cycle, which will reduce the overall efficiency of the cooling tower.

Because of its simple structure, easy installation and good spraying effect, the nozzle has been widely used in the cooling tower industry, and the plate splash nozzle has the characteristics of large spraying area and uniform spraying, which is favored by users. Patent No. 201320019328.9 discloses a three-layer splash nozzle. The three-layer splash boards spread the spray water sequentially to achieve uniform spraying effect. Water pipes are connected. But there is a wall flow situation in the cooling tower.

Contents of the invention

The present invention aims to solve the technical problem of wall flow in cooling towers, and provides a wall flow nozzle for cooling towers. After installing the wall flow nozzle, it can effectively prevent the generation of wall flow, and at the same time reduce the occurrence of blind spots in the nozzle. The spraying is more uniform in the whole spraying area, the nozzle is easy to use, and the anti-wall flow effect is obvious.

The present invention is achieved through the following technical solutions:

A nozzle for cooling tower wall-defense flow, which is composed of a fixed sleeve and a nozzle main body. Its characteristics are: the upper part of the fixed sleeve is fixedly connected with the water distribution pipeline, and the lower part is fixedly connected with the water inlet at the upper end of the nozzle main body. The conical diversion channel of the main body of the nozzle is provided with a water shield on the back of the nozzle, and in the middle of the back water shield, there are four splash boards in sequence from top to bottom, and each splash board is equipped with a water splash on the outer cylindrical surface. Board jagged edges.

The lower part of the fixing sleeve is provided with a guide pin groove and a fixing hole, and the water inlet side of the nozzle main body is provided with a fixing bolt, and the nozzle main body is inserted into the fixing hole on the fixing sleeve through the fixing bolt to be fixedly connected with the fixing sleeve.

The fixed sleeve is connected with the water distribution pipeline through the coupling port on it. The center of the water baffle on the back of the nozzle is provided with a semi-conical diversion channel, and the semi-conical diversion channel reaches the end of the fourth splash plate. The center position of the splash board is high, and the edge position is low. There is a slope from the center to the edge position, and the slope angle is α=10~30 degrees.

The beneficial effects of the present invention are: the present invention can almost prevent the occurrence of wall flow, and at the same time, the spraying of the cooling tower will be more uniform, and the cooling capacity of the cooling tower can be effectively improved. easy and convenient.

Description of drawings

Fig. 1a is a schematic perspective view of the structure of the present invention;

Fig. 1 b is the left view of the present invention;

Figure 2a is a top view of the back water shield;

Fig. 2b is a three-dimensional schematic diagram of the back water shield;

Fig. 3 is a front view of the fixed bolt;

Figure 4a is a front view of the fixing sleeve;

Fig. 4b is a three-dimensional schematic diagram of a fixed sleeve;

Figure 5a is a front view of the splash board;

Figure 5b is a top view of the splash board;

Fig. 6 is a schematic diagram of the spraying area of the shower head.

detailed description

Below in conjunction with accompanying drawing and embodiment the present invention is described in detail.

As shown in Figures 1a and 1b, the spray head used for cooling tower wall flow is composed of two parts: the main body of the spray head and the fixed sleeve. The main body of the sprinkler head includes a water inlet 1, a fixed pin 3, a conical central diversion channel 2, a splash plate 4 on the back of the sprinkler head, a first layer splash plate 5, a second layer splash plate 6, a third layer splash plate 7, The fourth floor splash board 8, edge sawtooth 9.

As shown in FIGS. 4 a and 4 b , the fixing sleeve includes a connection port 13 connected with the water distribution pipe, a handle 10 , a guide pin slot 11 , and a fixing hole 12 .

The fixed sleeve is cylindrical, with a total length of 45~60mm. It is divided into two parts, the upper part and the upper part. 3mm, connected with the water distribution pipe by hot melt adhesive, the lower part is 25~35mm long, 33.4mm inner diameter, 2~3mm thick, with pin groove 11 and fixing hole 12.

(1)

In the formula: D ₁ —the outer diameter of the water distribution pipe;

d—the outer diameter of the upper half of the sleeve;

The water inlet 1 of the main body of the nozzle has an outer diameter of 33.4mm and a wall thickness of 2~3mm. There is a fixed pin 3 on it (Figure 3). After it cooperates with the pin groove 11 and the fixed hole 12, the position and orientation of the nozzle are fixed.

The main body of the sprinkler head is divided into two halves from the centerline. One half has four layers of semicircular splash plates (Fig. 5a, 5b). The water is splashed layer by layer by these four layers of splash plates. The other half is There is a water shield 4 on the back of the nozzle with a semi-conical diversion channel in the middle (Figure 2a, 2b). The water shield 4 on the back of the nozzle cooperates with the four-layer splash plate to form the main body of the nozzle with a central conical through hole.

The first splash board encountered by the spray water in the process of falling is the first splash board 5, which is arranged in sequence. The diameter of the first splash board 5 is 80~100mm, and the diameter of the central through hole is 20~22mm. Its vertical distance to the water outlet is 25 ~ 35mm, and the water distribution of the first layer of splash plate 5 accounts for about 50% of the total water flow of the nozzle.

The diameter of the second splash board 6 is 50~60mm, the diameter of the central through hole is 13~15mm, the vertical distance from it to the first splash board 5 is 25~35mm, and the water distribution of the second splash board 6 accounts for about 25% of the water volume.

The diameter of the third splash board 7 is 20~25mm, and the diameter of the central through hole is 5~7mm. The vertical distance from it to the second splash board 6 is 25~35mm. 20% of the water volume.

The diameter of the fourth splash board 8 is 3~5mm, and there is no through hole in the center. The vertical distance from it to the third splash board 7 is 10~15mm. %.

The middle of the splashboard is high and the edge is low, forming an angle with a slope of α. The slope angle of the splashboard gradually increases from the first floor to the fourth floor, and α is generally 10~30°.

The edge of the splashboard is serrated, the tooth height of the sawtooth is 3~6mm, and the central angle corresponding to the serration is β. According to the size of the splashboard of different layers, the value of the central angle is different, but the center of the circle between the centers of the two teeth The angle is always 2β.

The following embodiments take a square tower as an example.

During installation, the fixing sleeve is installed on the water distribution pipe, and the fixing hole of the fixing sleeve is oriented parallel to the wall of the adjacent cooling tower, so as to ensure that all the semicircular areas sprayed by the anti-wall flow nozzle are on the filler.

As shown in FIG. 6 , the nozzles in the total spraying area C are arranged in a center-crossing manner, that is, the outer diameter of the spraying area of one nozzle passes through the center of the spraying area of the adjacent nozzle, and the conventional nozzles 20 are arranged in the dotted line area. The diameter of the spraying area A of a single conventional nozzle is D ₁ , and the distance between the anti-wall flow nozzle 21 and the adjacent conventional nozzle 20 is 1.1~1.2D ₁ , which can ensure that when the spraying water volume fluctuates within a certain range of design flow, the conventional nozzle 20 sprays water It will not spray onto the wall, effectively preventing the generation of wall flow. The anti-wall flow nozzle 21 is installed directly above the edge of the packing, and the diameter of its spraying area B is 1.1~1.2D ₁ . The anti-wall flow nozzle 21 has the same spray volume as the conventional nozzle 20, and the conical diversion channel on the back baffle of the nozzle body plays a role of diversion, as shown in Figure 2b. When the spray water flows down vertically at the flow rate V ₁ , V ₁ will gradually increase under the action of the conical diversion channel, and a part of the water will inelastically collide with the first layer of splash plate during the process of continuing to fall. There is a certain slope, and oblique impact occurs. According to the principle of inelastic oblique impact, momentum is conserved, and the horizontal velocity of spray water V=V ₁ , the horizontal flow velocity V of spray water leaving the splash plate will be greater than that of conventional sprinklers. Equation (2) shows that the diameter of the spraying area D ₂ is larger.

(2)

In the formula: V—the velocity in the horizontal direction of the spray water;

H—vertical distance from splash plate to filler;

g—gravitational acceleration;

After the spray water is captured by the first layer of splash plate, it is evenly dispersed along the edge of the splash plate at a horizontal velocity V. When the spray water leaves the sawtooth edge, there will be a viscous force that hinders part of the spray water. , the fluidity of this part of the water will decrease, and it can be seen from formula ( ₂ ) that the diameter D2 of the spraying area will decrease, so that the spraying water can achieve a better dispersion effect.

The second, third, and fourth layers of splash boards have the same effect as the first layer. The spray water is captured by the layer-by-layer splash boards in the process of falling, and then dispersed by the layer of splash boards, so that the spray water The spray water is sprayed more evenly in the spray area, which improves the cooling capacity of the cooling tower.

The present invention adopts the cooperation of the fixed bolt, the bolt groove and the fixed hole, which ensures the fixed direction of the nozzle and makes the installation and replacement more simple and convenient.

The invention is suitable for a cooling tower with pipe-type water distribution. The main body of the nozzle is made of glass fiber reinforced nylon, which is high temperature resistant, not easy to deform, and can ensure the uniformity and stability of spraying.

Claims (4)

1., for a cooling tower anti-wall flow shower nozzle, it is made up of fixing sleeve and nozzle body, it is characterised in that: described fixing Sleeve top half is connected with water distributor by connector (13), and the latter half is fixing with the water inlet location of nozzle body upper end Connecting, nozzle body position of center line is split into two halves, and wherein there are four layers of semicircle splash board, every piece of splash board outer cylinder in half portion Being provided with splash board jagged edge (9), second half is the middle shower nozzle back water fender with half cone-shaped flow-guiding channel (2) (4), shower nozzle back water fender (4) and four layers of splash board fit in the nozzle body of center circle conical through-hole.

It is the most according to claim 1 for cooling tower anti-wall flow shower nozzle, it is characterised in that: described fixing sleeve the latter half Being provided with pilot pin groove (11) and fixing hole (12), water inlet (1) side of described nozzle body is provided with Fixed latches (3), shower nozzle master Body inserts the fixing hole (12) on fixing sleeve by Fixed latches (3) and positions fixing connection with fixing sleeve.

It is the most according to claim 1 for cooling tower anti-wall flow shower nozzle, it is characterised in that: described shower nozzle back water fender (4) center is provided with half cone-shaped flow-guiding channel, and half cone-shaped flow-guiding channel is until the 4th layer of splash board (8) is ended.

It is the most according to claim 1 for cooling tower anti-wall flow shower nozzle, it is characterised in that: described splash board center Height, margin location sets low, and is equipped with a gradient from center to closing on margin location, its angle of gradient α=10 ~ 30 degree.