Spraying equipment for heat exchange of closed cooling tower

Abstract

The invention discloses spraying equipment for heat exchange of a closed cooling tower, and belongs to the technical field of spraying equipment for heat exchange of closed cooling towers. The spraying equipment comprises a liquid conveying pipe connected to the outer side of the closed cooling tower, a control valve is installed on the liquid conveying pipe, fixing pipes are evenly and fixedly installed on the liquid conveying pipe, and the end of each fixing pipe is connected with a spraying assembly; the spraying assembly comprises a rotating sleeve which is uniformly arranged on the side wall of the closed cooling tower in a penetrating and rotating manner, a spraying pipe is elastically arranged on the rotating sleeve in a sliding manner, spraying heads are uniformly arranged on the spraying pipe, and a cleaning assembly for cleaning the inner wall of the spraying pipe is connected between the rotating sleeve and the spraying pipe. According to the spraying equipment for heat exchange of the closed cooling tower, multi-direction movement adjustment of the spray head can be achieved, spraying uniformity is ensured, self-adaptive adjustment of spraying pressure can be achieved in the adjustment process, the cooling effect is effectively ensured, and meanwhile the efficient cleaning effect can be achieved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of spraying equipment, in particular to spraying equipment for heat exchange of a closed cooling tower. BACKGROUND

[0002] In the operation process of a closed cooling tower, spraying equipment plays a key role, which is responsible for uniformly distributing cooling water in the form of spraying or jetting onto a tubular heat exchanger to realize effective heat exchange with cooling air. However, the existing spraying equipment for heat exchange of a closed cooling tower still has many problems in actual application.

[0003] The existing technology (Chinese patent with publication number CN118913012B and publication date April 1, 2025) discloses a spraying device of a closed cooling tower, which comprises a cooling tower main body, a plurality of air outlets are arranged at the top end of the cooling tower main body, an exhaust fan is installed in the air outlet, air inlets are arranged at both ends of the cooling tower main body, a cooling pipe is installed at the middle of the inside of the cooling tower main body, a water pump is installed at the bottom end of one side of the cooling tower main body, a water outlet of the water pump is provided with a water delivery pipe, a plurality of water guide pipes are fixed at the top end of the water delivery pipe, a plurality of water spraying heads are installed at the bottom end of the water guide pipes at equal intervals, and a cleaning structure for cleaning dirt is installed in the water guide pipe; the impurities and algae on the inner surface of the water guide pipe can be scraped off by rotating the rotating column to drive the scraper plate, and the top block is flipped to drive the moving column to ascend and descend in the water spraying head; the inner wall of the water spraying head can be scraped and cleaned by the scraper plate driven by the moving column during the ascending and descending process, so that the water guide pipe and the water spraying head can be cleaned during operation. The existing technology (Chinese patent with publication number CN116399159B and publication date August 4, 2023) discloses a spraying device of a closed cooling tower, which comprises a cooling tower and a pipeline, the pipeline is horizontally rotatably installed in the cooling tower, a circular groove is formed in one side of the inside of the cooling tower, and a rotating disc is rotatably installed in the circular groove, the rotating disc is fixedly installed at the center of one side of the pipeline, the surface of the pipeline is connected with a plurality of spray heads, the spray heads are divided into four groups and are evenly distributed on the surface of the pipeline in a ring shape at equal intervals, each group of spray heads is evenly distributed in a straight line at equal intervals, and a plug-in plate is horizontally arranged in the inside of the cooling tower and evenly distributed in a ring shape at equal intervals; the spraying device can spray in multiple directions, avoids the problem that the spray heads are fixedly sprayed to cause uneven spraying, further improves the effect of contact between cooling water and the elbow pipe, and improves the use effect of the equipment.

[0004] In the use process of the existing spraying equipment for heat exchange of a closed cooling tower, although the movement of the spray head can realize uniform spraying, the spraying pressure cannot be adjusted synchronously during the movement adjustment, so that the water film distribution on the outside of the cooling pipe is uneven, and the cooling effect is affected. SUMMARY

[0005] The present application aims to provide a closed cooling tower heat exchange spraying equipment to solve the above background of the current market in the process of adjusting the closed cooling tower heat exchange spraying equipment, which cannot adjust the spraying pressure synchronously, resulting in uneven distribution of water film outside the cooling pipe.

[0006] To achieve the above object, the present application provides the following technical solutions: a closed cooling tower heat exchange spraying equipment, comprising a liquid delivery pipe connected to the outside of the closed cooling tower, a control valve mounted on the liquid delivery pipe, and a fixed pipe uniformly and fixedly mounted on the liquid delivery pipe, and a spraying assembly connected to the end of the fixed pipe; the spraying assembly comprises a rotating sleeve uniformly and rotatably installed on the side wall of the closed cooling tower, an spraying pipe elastically and slidably installed on the rotating sleeve, and spraying heads uniformly mounted on the spraying pipe, a driving assembly mounted on the outside of the closed cooling tower to drive the rotating sleeve and the spraying pipe to reciprocatingly rotate, a position adjusting driving assembly connected between the end of the spraying pipe away from the rotating sleeve and the inner wall of the closed cooling tower to adjust the horizontal movement of the spraying pipe, a cleaning assembly connected between the rotating sleeve and the spraying pipe to clean the inner wall of the spraying pipe, and the driving assembly is driven to work when the rotating sleeve and the spraying pipe are adjusted.

[0007] Preferably, the driving assembly comprises a motor fixedly installed on the outside of the closed cooling tower, a transmission gear set connected between the motor and the rotating sleeve located at the middle position, the motor drives the rotating sleeve to reciprocatingly rotate, and the adjacent rotating sleeves are synchronously connected through transmission belt pulleys, the spraying pipe is located above the heat exchange pipe of the closed cooling tower, and the spraying heads face the heat exchange pipe, the rotating sleeve is sealingly and rotatably connected with a rotating seat, and the rotating seat is connected with the fixed pipe.

[0008] Preferably, the inner wall of the rotating sleeve is provided with a sliding groove, one end of the spraying pipe located inside the rotating sleeve is provided with a sliding key, and the rotating sleeve drives the spraying pipe to reciprocatingly rotate during rotation, and the spraying heads swing and spray uniformly to the heat exchange pipe during repeated rotation of the spraying pipe.

[0009] Preferably, the position adjusting driving assembly comprises a connecting column fixedly installed at the end of the spraying pipe and a fixed cylinder fixedly installed on the inner wall of the closed cooling tower, and the fixed cylinder and the connecting column are sleeved.

[0010] Preferably, the inner wall of the fixed cylinder is embedded with first balls, the outer side of the connecting column is provided with two first guide grooves, one end of the two first guide grooves close to the spraying pipe is connected, the first guide grooves are helical, the pitch of the first guide grooves gradually increases from left to right, the first balls roll along the first guide grooves when the spraying pipe drives the connecting column to rotate, and the spraying pipe is driven to move horizontally.

[0011] Preferably, a spring is connected between the rotating sleeve and the spray pipe, and the rotating sleeve and the spray pipe are sealingly connected, and the spray liquid in the fixed pipe enters the inside of the rotating sleeve through the through hole on the spray pipe, and the pressure inside the spray pipe increases when the rotating sleeve and the spray pipe are contracted and adjusted.

[0012] Preferably, the cleaning assembly comprises a rotating rod rotatably installed on the inside of the rotating sleeve, and the rotating sleeve and the rotating rod are coaxially arranged, and the rotating rod slides through the left end of the spray pipe, and the second ball is embeddedly installed on the inside wall of the through hole at the left end of the spray pipe, and the outside of the rotating rod is provided with a second spiral guide groove, and the second ball rolls along the second guide groove when the rotating sleeve and the spray pipe are contracted and adjusted, thereby driving the rotating rod to rotate.

[0013] Preferably, cleaning brush pieces are symmetrically and fixedly installed on the outside of the rotating rod, and the length of the cleaning brush pieces is less than the length of the spray pipe, and the cleaning brush pieces are attached to the inner wall of the spray pipe, and the position of the spray pipe and the cleaning brush pieces is relatively adjusted when the cleaning brush pieces rotate.

[0014] Preferably, cutting pieces are also symmetrically and fixedly installed on the rotating rod, and the cutting pieces cut the impurities on the inside of the spray pipe during the rotation of the rotating rod.

[0015] Compared with the prior art, the beneficial effects of the present application are that the closed cooling tower heat exchange spray equipment can realize multi-directional movement adjustment of the spray head, ensure the uniformity of spraying, and realize self-adaptive adjustment of the spraying pressure during adjustment, effectively ensure the cooling effect, and can realize efficient cleaning effect, and the specific contents are as follows. 1. The rotating sleeve and the spray pipe are provided, and the motor drives the rotating sleeve to rotate synchronously through the transmission gear set, so that the rotating sleeve can drive the spray pipe to rotate synchronously, the spray head on the spray pipe can swing, the uniformity of spraying is effectively improved, and the cooling effect of the heat exchange pipe is improved.

[0016] 2. The spray pipe, the fixed cylinder and the connecting column are provided, the spray pipe drives the connecting column to rotate synchronously on the inside of the fixed cylinder when the rotating sleeve drives the spray pipe to rotate, the first ball on the inside of the fixed cylinder rolls along the first guide groove provided on the outside of the connecting column, the rotating sleeve and the spray pipe are contracted and adjusted, the uniformity of spraying is further improved, and the pressure inside the spray pipe is self-adaptively adjusted when the rotating sleeve and the spray pipe are contracted and adjusted, so that the spraying pressure during oblique spraying is ensured, and the stable cooling of the cooling pipe is ensured.

[0017] 3、Setting has the rotating sleeve, the spray pipe and the cleaning brush piece, with the telescopic adjustment of the rotating sleeve and the spray pipe, can drive the rotating rod to drive the cleaning brush piece, the cutting piece to carry on the reciprocating rotation, further realizes the cleaning to the spray pipe inner wall, and the spray pipe and the cleaning brush piece will find the horizontal relative displacement, thereby further improve the cleaning effect.

[0018] Further, when the spraying is finished, the control valve on the infusion tube is closed, and the motor is started again to drive the rotating sleeve and the spray pipe to carry out telescopic adjustment, so that the spray pipe can reciprocate suction and exhaust through the spray head, thereby realizing bidirectional flushing of the spray head, and further realizing the anti-blocking of the spray head. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is infusion tube installation structure schematic view of the application; Figure 2 It is rotating sleeve and spray pipe installation structure schematic view of the application; Figure 3 It is rotating sleeve and spray pipe connection structure schematic view of the application; Figure 4 It is rotating sleeve and spray pipe section structure schematic view of the application; Figure 5 It is rotating sleeve and spray pipe split structure schematic view of the application; Figure 6 It is rotating sleeve section structure schematic view of the application; Figure 7 It is rotating sleeve section structure schematic view of the application; Figure 6 It is rotating sleeve section structure schematic view of the application; Figure 8 It is fixed cylinder and connection column connection structure schematic view of the application; Figure 9 It is connection column and first ball connection structure schematic view of the application; Figure 10 It is cleaning brush piece and cutting piece installation structure schematic view of the application.

[0020] In the figure: 1, infusion tube; 2, fixed tube; 3, rotating seat; 4, rotating sleeve; 401, sliding groove; 5, spray pipe; 6, spray head; 7, motor; 8, transmission gear set; 9, fixed cylinder; 10, connection column; 11, first guide groove; 12, first ball; 13, spring; 14, rotating rod; 15, second guide groove; 16, second ball; 17, cleaning brush piece; 18, cutting piece. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0022] Embodiment one: the spray adjustment direction of the existing spray equipment for heat exchange of a closed cooling tower is single, and the self-adaptive adjustment of the spray pressure after adjustment cannot be guaranteed, so that the cooling effect on the heat exchange pipes cannot be guaranteed. In order to solve this technical problem, the present embodiment discloses the following technical content, please refer to Figures 1-6 and Figures 8-9 A spray equipment for heat exchange of a closed cooling tower, comprising a liquid conveying pipe 1 connected to the outside of the closed cooling tower, a control valve is installed on the liquid conveying pipe 1, and a fixed pipe 2 is uniformly and fixedly installed on the liquid conveying pipe 1, and the end of the fixed pipe 2 is connected with a spray assembly, the spray assembly comprises a rotating sleeve pipe 4 which is uniformly and rotatably installed on the side wall of the closed cooling tower, a spray pipe 5 which is elastically and slidably installed on the rotating sleeve pipe 4, and a spray head 6 which is uniformly installed on the spray pipe 5, a driving assembly for driving the rotating sleeve pipe 4 and the spray pipe 5 to reciprocating rotate is installed on the outside of the closed cooling tower, and a position adjusting driving assembly for adjusting the horizontal movement of the spray pipe 5 is connected between the end of the spray pipe 5 away from the rotating sleeve pipe 4 and the inner wall of the closed cooling tower.

[0023] The driving assembly comprises a motor 7 fixedly installed on the outside of the closed cooling tower, a transmission gear set 8 connected between the motor 7 and the rotating sleeve pipe 4 located at the middle position, and the motor 7 drives the rotating sleeve pipe 4 to reciprocating rotate, and the adjacent rotating sleeve pipes 4 are synchronously and transmissionally connected through transmission belt pulleys, the spray pipe 5 is located above the heat exchange pipes of the closed cooling tower, and the spray head 6 faces the heat exchange pipes, the rotating sleeve pipe 4 is sealingly and rotatably connected with a rotating seat 3, the rotating seat 3 is communicated with the fixed pipe 2, a sliding groove 401 is formed in the inner wall of the rotating sleeve pipe 4, one end of the spray pipe 5 located inside the rotating sleeve pipe 4 is provided with a sliding key, and the rotating sleeve pipe 4 drives the spray pipe 5 to reciprocating rotate in the rotating process, and the spray head 6 uniformly swings and sprays to the heat exchange pipes in the repeated rotating process of the spray pipe 5.

[0024] When the spray cooling is needed, the cooling water is transported to the rotating seat 3 and the inside of the rotating sleeve 4 through the infusion tube 1 and the fixed tube 2, and the cooling water enters the inside of the spray pipe 5 through the holes at the end of the spray pipe 5, so that the cooling water is sprayed to the heat exchange pipe through the spray head 6, and the motor 7 is started to drive the plurality of rotating sleeves 4 to synchronously reciprocating swing through the transmission gear set 8, the rotating angle of the rotating sleeve 4 is 45° to -45°, at this time the rotating sleeve 4 can drive the spray pipe 5 to synchronously reciprocating rotation, so that the spray head 6 on the spray pipe 5 can swing to spray, thereby improving the spraying uniformity.

[0025] The position adjusting driving assembly comprises the connecting column 10 fixedly installed at the end of the spray pipe 5 and the fixed cylinder 9 fixedly installed on the inner wall of the closed cooling tower, the fixed cylinder 9 and the connecting column 10 are sleeved, the first ball 12 is embeddedly installed on the inner wall of the fixed cylinder 9, two first guide grooves 11 are formed on the outer side of the connecting column 10, the two first guide grooves 11 are connected at one end close to the spray pipe 5, the first guide groove 11 is helical, the pitch of the first guide groove 11 gradually increases from left to right, the first ball 12 rolls along the first guide groove 11 when the spray pipe 5 drives the connecting column 10 to rotate, thereby driving the spray pipe 5 to move horizontally to adjust, the spring 13 is connected between the rotating sleeve 4 and the spray pipe 5, the rotating sleeve 4 and the spray pipe 5 are sealingly connected, the spray liquid in the fixed tube 2 enters the inside of the rotating sleeve 4 and then enters the inside of the spray pipe 5 through the through hole on the spray pipe 5, and the pressure in the inside of the spray pipe 5 increases when the rotating sleeve 4 and the spray pipe 5 are contracted to adjust.

[0026] When the spray pipe 5 rotates, the connecting column 10 arranged at the right end is driven to rotate synchronously, the connecting column 10 rotates synchronously in the inside of the fixed cylinder 9, thereby driving the rotating sleeve 4 and the spray pipe 5 to adjust the extension and contraction, thereby further improving the spraying uniformity, and the extension and contraction of the rotating sleeve 4 and the spray pipe 5 can make the spray pipe 5 adaptively adjust the pressure in the inside of the spray pipe 5 when the spray pipe 5 rotates, because the pitch of the first guide groove 11 changes, the greater the rotating angle, the faster the horizontal extension and contraction speed of the spray pipe 5, thereby the greater the spraying pressure, thereby ensuring that the spraying pressure is sufficient when the spray is inclined, and the stable cooling of the cooling pipe is realized.

[0027] Embodiment two: the technical content disclosed in this embodiment is further improved on the basis of the above-mentioned embodiment one, the existing spray equipment for the closed cooling tower heat exchange is not convenient for effectively cleaning the pipeline and the spray head, which is easy to be blocked after long-term use, in order to further solve this technical problem, the embodiment discloses the following technical content, such as Figures 4-7 and Figure 10The cleaning assembly for cleaning the inner wall of the spray pipe 5 is connected between the rotating sleeve 4 and the spray pipe 5, and the cleaning assembly is driven to work when the rotating sleeve 4 and the spray pipe 5 are adjusted in extension and retraction. The cleaning assembly comprises a rotating rod 14 rotatably installed on the inner side of the rotating sleeve 4, and the rotating sleeve 4 and the rotating rod 14 are coaxially arranged, and the rotating rod 14 slidably penetrates the left end of the spray pipe 5, and the second ball 16 is embeddedly installed on the inner wall of the penetrating hole at the left end of the spray pipe 5, and the outer side of the rotating rod 14 is provided with a helical second guide groove 15, and the second ball 16 rolls along the second guide groove 15 when the rotating sleeve 4 and the spray pipe 5 are adjusted in extension and retraction, thereby driving the rotating rod 14 to rotate, and the cleaning brush 17 is symmetrically and fixedly installed on the outer side of the rotating rod 14, and the length of the cleaning brush 17 is less than the length of the spray pipe 5, and the cleaning brush 17 is attached to the inner wall of the spray pipe 5, and the position of the spray pipe 5 and the cleaning brush 17 is adjusted in relative horizontal direction when the cleaning brush 17 rotates, and the cutting blade 18 is also symmetrically and fixedly installed on the rotating rod 14, and the cutting blade 18 cuts the impurities on the inner side of the spray pipe 5 during the rotation of the rotating rod 14.

[0028] With the extension and retraction adjustment of the rotating sleeve 4 and the spray pipe 5, the spray pipe 5 and the rotating rod 14 are synchronously adjusted in reciprocating extension and retraction, so that the second ball 16 embeddedly installed at the end of the spray pipe 5 rolls along the helical second guide groove 15 on the rotating rod 14, thereby driving the rotating rod 14 to reciprocating rotate, and further driving the cleaning brush 17 and the cutting blade 18 to reciprocating rotate, so as to clean the inner wall of the spray pipe 5, and the spray pipe 5 and the cleaning brush 17 are horizontally displaced in relative position, thereby further improving the cleaning effect. After the spraying is completed, the control valve on the infusion pipe 1 is closed, and the motor 7 is started again to drive the rotating sleeve 4 and the spray pipe 5 to adjust in reciprocating extension and retraction, so that the spray pipe 5 can reciprocatingly inhale and exhaust through the spray head 6, thereby realizing the forward and reverse bidirectional flushing of the spray head 6, and further realizing the anti-blocking and cleaning of the spray head 6.

[0029] The contents not described in detail in the specification belong to the prior art known by the person skilled in the art.

[0030] Although the present application has been described in detail with reference to the foregoing embodiments, the skilled in the art can modify the technical solutions recorded in the foregoing embodiments, or equivalently replace some of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A spray device for heat exchange in a closed cooling tower, comprising a liquid delivery pipe (1) connected to the outside of the closed cooling tower, wherein a control valve is installed on the liquid delivery pipe (1), and a fixed pipe (2) is uniformly fixedly installed on the liquid delivery pipe (1), and a spray assembly is connected to the end of the fixed pipe (2). Its features are, The spray assembly includes a rotating sleeve (4) uniformly and rotatably installed on the side wall of the closed cooling tower, and a spray pipe (5) is elastically and slidably installed on the rotating sleeve (4), and spray heads (6) are uniformly installed on the spray pipe (5). A drive assembly for driving the rotating sleeve (4) and the spray pipe (5) to reciprocate is installed on the outside of the closed cooling tower. A position adjustment drive assembly for controlling the horizontal movement adjustment of the spray pipe (5) is connected between the end of the spray pipe (5) away from the rotating sleeve (4) and the inner wall of the closed cooling tower. A cleaning assembly for cleaning the inner wall of the spray pipe (5) is connected between the rotating sleeve (4) and the spray pipe (5), and the cleaning assembly is driven to work when the rotating sleeve (4) and the spray pipe (5) are extended and retracted.

2. The spray device for heat exchange in a closed cooling tower according to claim 1, characterized in that: The drive assembly includes a motor (7) fixedly installed on the outside of the closed cooling tower, and a transmission gear set (8) is connected between the motor (7) and the rotating sleeve (4) located in the middle position. The motor (7) drives the rotating sleeve (4) to reciprocate. At the same time, adjacent rotating sleeves (4) are synchronously connected through a transmission pulley. The spray pipe (5) is located above the heat exchange pipe of the closed cooling tower, and the spray head (6) faces the heat exchange pipe. The rotating sleeve (4) is sealed and rotatably connected to a rotating seat (3), and the rotating seat (3) is connected to the fixed pipe (2).

3. The spray device for heat exchange in a closed cooling tower according to claim 1, characterized in that: The inner wall of the rotating sleeve (4) is provided with a sliding groove (401), and the spray pipe (5) is provided with a sliding key at one end inside the rotating sleeve (4). During the rotation of the rotating sleeve (4), the spray pipe (5) is driven to rotate back and forth. At the same time, during the repeated rotation of the spray pipe (5), the spray head (6) swings and sprays evenly onto the heat exchange tube.

4. The spray device for heat exchange in a closed cooling tower according to claim 1, characterized in that: The adjustment drive assembly includes a connecting column (10) fixedly installed at the end of the spray pipe (5) and a fixed cylinder (9) fixedly installed on the inner wall of the closed cooling tower, and the fixed cylinder (9) and the connecting column (10) are connected together.

5. A spray device for heat exchange in a closed cooling tower according to claim 4, characterized in that: The inner wall of the fixed cylinder (9) is embedded with a first ball bearing (12), and two first guide grooves (11) are opened on the outer side of the connecting column (10). The two first guide grooves (11) are connected to one end of the spray pipe (5). The first guide groove (11) is spiral, and the pitch of the first guide groove (11) gradually increases from left to right. When the spray pipe (5) drives the connecting column (10) to rotate, the first ball bearing (12) rolls along the first guide groove (11) to drive the spray pipe (5) to move horizontally for adjustment.

6. The spray device for heat exchange in a closed cooling tower according to claim 1, characterized in that: A spring (13) is connected between the rotating sleeve (4) and the spray pipe (5), and the rotating sleeve (4) and the spray pipe (5) are sealed together. After the spray liquid in the fixed pipe (2) enters the inner side of the rotating sleeve (4), it enters the inner side of the spray pipe (5) through the through hole on the spray pipe (5). At the same time, when the rotating sleeve (4) and the spray pipe (5) are contracted and adjusted, the pressure inside the spray pipe (5) increases.

7. A spray device for heat exchange in a closed cooling tower according to claim 1, characterized in that: The cleaning assembly includes a rotating rod (14) rotatably mounted inside the rotating sleeve (4), and the rotating sleeve (4) and the rotating rod (14) are coaxially arranged. The rotating rod (14) slides through the left end of the spray pipe (5), and a second ball bearing (16) is embedded in the inner wall of the through hole at the left end of the spray pipe (5). A spiral second guide groove (15) is provided on the outer side of the rotating rod (14), and the second ball bearing (16) rolls along the second guide groove (15) when the rotating sleeve (4) and the spray pipe (5) are extended and retracted, driving the rotating rod (14) to rotate.

8. A spray device for heat exchange in a closed cooling tower according to claim 7, characterized in that: A cleaning brush (17) is symmetrically fixed on the outside of the rotating rod (14), and the length of the cleaning brush (17) is less than the length of the spray pipe (5). The cleaning brush (17) is attached to the inner wall of the spray pipe (5), and the relative horizontal adjustment of the positions of the spray pipe (5) and the cleaning brush (17) occurs when the cleaning brush (17) rotates.

9. A spray device for heat exchange in a closed cooling tower according to claim 8, characterized in that: A cutting blade (18) is also symmetrically fixed on the rotating rod (14), and the cutting blade (18) cuts the impurities inside the spray pipe (5) during the rotation of the rotating rod (14).

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