TWM577458U - Belt driving mechanism for blower of cooling tower - Google Patents

Abstract

Provided is a belt transmission mechanism for a blower of a cooling tower, which uses a flat belt as a transmission belt for the blower, and is suitably provided with a tension adjustment part that suppresses the meandering of the belt, can prevent the belt from falling off, realizes maintenance-free, and realizes an impeller Drive efficiency. A flat belt is used as the transmission belt 13 stretched between the driving-side pulley 11 and the driven-side pulley 12, and the tension adjusting portion 14 that does not flex the belt 13 is maintained by the tensioning pulley 14 d in contact with the belt 13. It is set to also have the function of suppressing the meandering of the belt 13 in operation, and the rotation center position of the tensioning pulley 14d is located near the driven side pulley 12, so the tensioning pulley 14d of the tension adjustment section 14 can be used to The belt 13 is appropriately restricted, and even if the running direction of the belt 13 is changed by the reverse rotation of the impeller, it is possible to suppress the deviation of the belt 13 and prevent the belt 13 from falling off.

Description

Belt transmission mechanism for cooling tower blower

This creation relates to a cooling tower that allows a circulating liquid-phase heat medium to exchange heat with air in a heat exchange unit, and particularly relates to a belt that uses an electric motor to move a blower for ventilation in the cooling tower. Transmission mechanism.

Generally, a cooling tower installed outdoors is used for cooling a liquid-phase heat medium such as water circulating in a factory or air-conditioning equipment, and has the following structure: In a heat exchange section inside the cooling tower, the following The air (outside air) introduced from the outside by the operation of the blower (fan) exchanges heat directly or indirectly with the heat medium to cool it.

The blower used in such a cooling tower is usually a motor that drives the impeller to rotate. In the past, it is mainly used to separate the motor from the impeller by driving force transmission mechanism such as a belt transmission mechanism inserted between the impeller and the motor. Further, as such a mechanism, a belt transmission mechanism in which pulleys are respectively disposed on the motor side and the impeller side, and a belt is wound around the pulleys is often used.
An example of a cooling tower using such a belt drive mechanism for a blower is described in Japanese Patent Laid-Open No. 2000-145698.
[Prior Art Literature]
[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2000-145698

[Problems to be solved by creation]

The belt transmission mechanism related to the driving of the blower in the existing cooling tower is set as shown in the above-mentioned patent documents, and a V-shaped belt is usually used in the belt that transmits the driving force.

As described above, a person using a V-belt in a belt transmission mechanism has a feature of transmitting a driving force by inserting a V-belt in a V-shaped groove provided on the outer periphery of each pulley on the motor side or the blower side. It is difficult to cause the belt to meander or detach from the pulley while the belt is running. However, the structure of a V-shaped belt with an increased size in the thickness direction has the following problems: Since the belt has a large flexural rigidity, the loss associated with the transmission of driving force becomes larger.

In addition, if the belt is stretched and deflected as the belt changes over time, part of the belt floats from the surface of the pulleys on the motor or fan side and easily becomes smooth, and the transmission efficiency of the belt decreases. It is necessary to adjust the distance between the shafts between the motor and the fan to maintain the tightness of the belt to a certain degree, which has the problem of consuming maintenance time.

This creation was created to solve the above-mentioned problems, and the purpose is to provide a belt transmission mechanism for a cooling tower blower, which uses a flat belt as the transmission belt for the blower, and is appropriately provided with a tension adjustment unit that suppresses the belt's meandering to prevent The drop of the belt realizes maintenance-free operation and realizes the efficiency of impeller driving.
[Means for solving problems]

The belt transmission mechanism for the cooling tower blower of this creation is a cooling tower in which the air introduced from the outside through the exhaust ventilation of the blower exchanges heat with the heat medium of the cooling object to transfer the impeller of the blower from the motor. The belt driving mechanism for rotary driving force is characterized by comprising: a driving side pulley, which is integrally arranged with the output shaft of the motor; a driven side pulley, which is integrally arranged with the rotation shaft of the impeller of the blower; a belt, A flat belt is set between the driving side pulley and the driven side pulley; and a tension adjusting part is arranged between the driving side pulley and the driven side pulley, and uses a tensioned pulley pair that is in contact with the belt The belt exerts a force to keep it from flexing, and controls the movement in the width direction of the belt to suppress the meandering; and the tension adjusting unit is a normal rotating state of the fan for exhausting and ventilating the belt mounted between the pulleys The lower belt runs in the direction of the belt's slack side. The tensioning pulley is configured to be squeezed from the outside of the belt. And with tensioning pulley to the rotational center located at a distance of the center of rotation of the driven pulley side becomes a position within the area of approximately 35% from the drive shaft side pulley and the driven pulley between.

As described above, according to this creation, not only a flat belt is used as a transmission belt that is erected between the driving side pulley and the driven side pulley, but also the tension adjustment that keeps the belt inflexible by using the tensioning pulley that is in contact with the belt It is set to have the function of controlling the movement of the belt in the width direction to suppress the meandering of the belt, and the rotation center position of the tensioning pulley is located in a predetermined area near the driven side pulley to tighten the belt The roller can press the loose side of the belt, so that the belt can be properly restricted by the tensioning pulley of the tension adjustment part. When the motor is stopped, the impeller of the blower rotates in the opposite direction to that during normal operation by external force. The change of the running direction of the belt can also suppress the deviation of the belt and prevent the belt from falling off, which can surely reduce the burden related to maintenance. In addition, the use of a flat belt suppresses the loss of transmission, and the impeller can be driven efficiently.

In addition, the belt transmission mechanism for the cooling tower blower of the present invention is provided with a support device for supporting the above-mentioned motor to the side of the blower in an adjustable position as required, and the support device fixes the motor in a predetermined motor support state as follows : By the elastic deformation of each part of the blower when the blower operates, the motor output shaft is tilted in advance so that the rotation center axis of the driving side pulley becomes parallel to the rotation center axis of the driven side pulley.

As described above, according to this creation, a support device is provided to support the motor in an adjustable position. The direction of the output shaft of the motor can be adjusted to grasp in advance the deformation of the various parts of the blower caused by the dynamic load when the blower operates. The inclination of the output shaft of the motor is adjusted by using the position of the inclination to obtain the inclination angle of the shaft in the reverse direction, thereby setting the state of the inclination of the output shaft generated when the blower is operated to ensure the drive when the blower is operated The parallelism of the side pulley and the driven side pulley will not exert extra force on the running belt, and can properly exert the function of the belt tensioner to prevent the belt from hunting.

In addition, the belt transmission mechanism for the cooling tower blower of the present invention is provided with an outer cover that covers the driving pulley, the driven pulley, the belt, and the tension adjusting portion as necessary. The outer portion of the tension adjusting portion of the outer cover does not exist so that the outer cover is provided. The state of the openings communicating with the inside, and at least one or both of the part around the motor output shaft under the drive side pulley and the part around the impeller rotating shaft under the driven side pulley in the housing, It is a state which produces | generates at least the opening part which circulates outside air to the inside of a cover.

As described above, according to the present creation, an opening portion where water does not flow in and out near the tension adjustment portion in the cover, and on the other hand, the portion of the motor output shaft or impeller rotating shaft passing through the cover is provided to flow from the outside to the inside of the cover. The state of the opening portion of the air prevents water from reaching the inside of the cover from the outside to affect the tension adjusting portion in the vicinity of the tension adjusting portion. In order to allow external air to flow inside the cover, to prevent condensation due to the temperature difference between the inside and outside of the cover, to ensure that there is no liquid water in the cover, in addition to the tension adjustment section, it is also to suppress the Degradation due to contact.

In addition, the belt transmission mechanism for the cooling tower blower of this creation is set as follows: if necessary, the tension adjusting portion has an arm portion that can be tilted around an axis parallel to the rotation center axis of the driven-side pulley, The tensioning pulley is rotatably mounted on the arm portion, and together with the arm portion, is biased by a force applying mechanism in a direction approaching the driven-side pulley to contact the belt.

As described above, according to this creation, the tensioning pulley of the tension adjusting portion is installed on the tilting arm portion, and the force is applied by the urging mechanism to tilt in a direction approaching the driven side pulley to contact the belt, thereby pulling the The tight pulley is in contact with the belt and squeezes it. It can be constructed simply and compactly while suppressing the deflection and meandering of the belt. The tension adjustment part located on the air supply path of the blower can be reduced to the minimum necessary size and reduced. Supply air resistance, suppress the loss during operation in the cooling tower, and achieve further efficiency improvement.

Hereinafter, a belt transmission mechanism according to an embodiment of the present invention will be described based on FIG. 1 to FIG. 5 described above. In the present embodiment, an example will be described in which a cooling tower is used as a cross-flow type (cross-flow type) in which two heat exchange units are arranged facing each other while sandwiching a central portion of a blower for exhaust ventilation.

As shown in the above figures, the belt transmission mechanism 10 of this embodiment is used to transmit the driving force from the motor 70 to the blower 60 of the cooling tower 50. Specifically, the belt transmission mechanism 10 includes the following components: the drive side pulley 11, It is arranged integrally with the output shaft 71 of the motor 70; the driven-side pulley 12 is arranged integrally with the rotating shaft in the impeller 61 of the blower 60; and the belt 13 is mounted on the driving-side pulley 11 and the driven-side pulley Between 12; tension adjusting part 14 which keeps the belt 13 inflexible by using the tensioning pulley 14d which is in contact with the belt 13; the cover 15 which drives the driving side pulley 11, the driven side pulley 12, the belt 13 and the tension The adjustment unit 14 covers; and a support device 16 that supports the electric motor 70 to the side of the blower 60 in an adjustable position.

The cooling tower 50 to which the belt transmission mechanism 10 of the present embodiment is applied is a cross-flow type (cross-flow type) in which two heat exchange sections (not shown) are arranged to face each other while sandwiching the ventilation space in the center. Exhaust air is provided by a blower 60 arranged on an exhaust-side opening at the upper part of the center, and external air is introduced into each heat exchange part from the side, so that the air exchanges heat with a heat medium to be cooled; a belt transmission mechanism Each part of the cooling tower 50 other than 10 is, for example, a heat exchange part that performs heat exchange between circulating water and outside air, or an upper water tank and a lower water tank that are arranged above and below the heat exchange part, and performs drive control of the motor 70 The control system and the like are well-known structures, and detailed descriptions are omitted.

A motor 70 is disposed on the side of the blower 60 in the cooling tower 50 via the support device 16. Furthermore, it has a structure in which the rotation of the output shaft 71 of the motor 70 is transmitted to the impeller 61 of the blower 60 through the belt transmission mechanism 10, and the impeller 61 rotates to perform exhaust ventilation.

The above-mentioned drive side pulley 11 is fixedly arranged on the output shaft 71 of the motor 70, and is configured to be able to rotate integrally with the output shaft 71, and rotates with the rotation of the output shaft 71 of the motor 70, so that the wound belt 13 faces The tension pulley 14 d and the driven-side pulley 12 are operated by the tension adjusting unit 14.

The above-mentioned driven-side pulley 12 is fixedly disposed on the rotation shaft of the impeller 61 in the blower 60 and is configured to be able to rotate integrally with the impeller 61. The driven-side pulley 12 has a larger outer diameter than the driving-side pulley 11 and has a structure in which the impeller 61 rotates with a lower number of rotations relative to the output shaft 71 of the motor 70.

The above-mentioned belt 13 is formed as an endless flat belt, which is bridged between the driving-side pulley 11 and the driven-side pulley 12 and runs as the driving-side pulley 11 rotates, so that the driven-side pulley 12 rotates.

The above-mentioned tension adjusting portion 14 includes a base portion 14a fixedly disposed between the driving-side pulley 11 and the driven-side pulley 12 on the upper side of the blower 60, and an arm portion 14b that can surround and follow the driven-side pulley 12 The rotation center axis is parallel to the axis and tilted to be installed at one end of the base portion 14a; the spring 14c as a urging mechanism has its two ends mounted at the other end of the base portion 14a and the front end of the arm portion 14b, Apply a force in a direction that brings the front end of the arm portion 14b close to the other end portion of the base portion 14a; and the tensioning pulley 14d, which can surround the front end of the arm portion 14b parallel to the central axis of rotation of the driven-side pulley 12 The center axis rotates and the position in the direction of the center axis matches the position of the driven-side pulley 12 and is attached.

The tension adjusting section 14 is configured to tighten the pulley for a portion of the belt 13 positioned between the pulleys, where the belt is slack in the belt running direction in the normal operating state of the air blower 60 for exhaust ventilation. 14d is configured to be squeezed from the outside of the belt, and is arranged so that the distance between the rotation center of the tensioning pulley 14d and the rotation center position of the driven-side pulley 12 is the driving-side pulley 11 and the driven-side pulley 12 In the region where the distance between the axes is less than about 35%, it is more preferably in the region of about 24 to 31%.

In particular, the base portion 14a of the tension adjusting portion 14 has a structure in which the arm portion 14b is tilted in a direction approaching the driven-side pulley 12 by a spring 14c, and the tension portion 14d on the arm portion 14b is squeezed. The state of pressing the belt 13 is fixed to a predetermined position near the driven-side pulley 12. In this way, the main part of the tension adjusting part 14 other than the tensioning pulley 14d can be set by a mechanism that tilts the arm portion 14b in a predetermined direction with respect to the base portion 14a to move the tensioning pulley 14d. It can be compactly arranged on the lower side of the portion where the belt 13 runs, and the air supply resistance of the air blower 60 caused by the arrangement of the tension adjustment portion 14 can be suppressed to the minimum necessary.

In addition, the tension pulley 14d has a known mechanism for preventing meandering as described in, for example, Japanese Patent No. 3680083 or Japanese Patent No. 4365713, which is in contact with a flat belt running between pulleys to prevent the flat belt Snake or offset to the width of the belt.

Such a tensioning pulley 14d has a structure in which the force is tilted together with the arm portion 14b in a direction approaching the driven-side pulley 12, and the tension is brought into contact with the belt 13, thereby the belt 13 can be tensioned. The tight state is maintained without being deflected, and the widthwise movement of the belt 13 is controlled to suppress meandering and the like.

In addition, by arranging the rotation center of the tensioning pulley 14d in the tension adjusting portion 14 to be located in a predetermined area close to the driven-side pulley 12, even if the running direction of the belt 13 is assumed to be normal to the normal operation of the blower 60, When the state changes in the opposite direction, the meandering prevention function of the tightening pulley 14d with respect to the belt 13 can be maintained, and the deviation of the belt 13 can be suppressed to prevent falling off from each pulley.

The blower of the cooling tower has the following characteristics: When the motor is stopped, the impeller can be driven to the motor by the wind pressure applied to the impeller due to the flow of outside air such as strong winds or the exhaust from other cooling towers in close proximity. It usually rotates in the opposite direction when it is actuated.

The applicant in this case clearly pointed out the following problems: In this type of cooling tower blower, the flat belt and the tensioning pulley with a corresponding meandering prevention mechanism are assumed to be the same as a general blower that cannot generate reverse rotation of the impeller. When the impeller is rotated in a direction opposite to the direction of normal operation when it is placed at a predetermined position on the loose side of the belt near the drive-side pulley of the motor output shaft, the belt is applied from the tensioned pulley to the belt. The relationship between the force and the running direction of the belt changes. The function of preventing the meandering of the tensioning pulley is no longer functioning normally, and the shortcomings of the flat belt that is easy to shift in the width direction are directly manifested, and it is easy to fall into the state of the belt falling off.

In this regard, the applicant of the present case has confirmed that by setting the position of the tensioning pulley 14d of the tension adjusting section 14 as described above in a predetermined area close to the driven-side pulley 12, even if the impeller 61 reversely rotates, Basically, the relationship between the belt 13 and the tensioning pulley 14d is not changed, and the meandering prevention function of the tensioning pulley 14d can be smoothly maintained.

The cover 15 is formed in a substantially box shape and is disposed on the upper side of the blower 60, and covers the driving-side pulley 11, the driven-side pulley 12, the belt 13, and the tension adjustment unit 14. This cover 15 prevents the rain or the like from entering the water in the blower 60 from the outside, or the water droplets contained in the air reaching the blower 60 from the inside of the cooling tower through the exhaust ventilation to cause adverse effects on various parts of the transmission mechanism.

A portion around the tension adjustment portion of the cover 15 is in a state where there is no opening portion that allows the inside of the cover to communicate with the outside. At the time when the cover 15 is provided, when the gap between the cover and another member adjacent to the tension adjustment portion 14 becomes an opening, the opening is made non-existent by the insertion or filling of an elastic material or the like. Of the state. By eliminating the openings around the tension adjustment section 14, water or humid air from the inside of the cooling tower is prevented from contacting the tension adjustment section 14, thereby preventing deterioration of the tension adjustment section 14.

On the other hand, at least one or both of the peripheral portion of the motor output shaft on the lower side of the drive-side pulley 11 in the cover 15 and the peripheral portion of the impeller rotation shaft on the lower side of the driven-side pulley 12 exist from the inside to the outside of the cover. Openings for external water flow. In order to connect the drive-side pulley 11 or the driven-side pulley 12 housed in the housing to the motor output shaft or the impeller rotating shaft, respectively, the parts in the housing 15 are initially provided with through-holes of at least the size through which they pass. The opening portion may be formed as a part of such a through hole, that is, a gap portion remaining without being blocked by a member such as a shaft passing through the through hole. However, the present invention is not limited to this, and a through hole serving as an opening portion may be separately formed around the motor output shaft portion or the impeller rotation shaft portion of the cover 15.

By passing through the opening portion of the outer cover 15, air in and out of the outer cover 15 can prevent condensation caused by a temperature difference between the inside and the outside of the cover, and ensure that water generated by the condensation does not accumulate in the cover. In this state, in addition to the tension adjustment part, it can also prevent important parts of the blower or motor from coming into contact with water.

In addition, the openings around the motor output shaft or around the impeller rotating shaft of these housings 15 are downwards and become detached from the flow path of the air sent by the blower 60, so there is no water infiltration through the openings. Doubts inside the cover.

The supporting device 16 supports a motor 70 on the side of the blower 60 in an adjustable position. In detail, the supporting device 16 includes the following components: a base portion 16a that is integrated with the blower 60; and an adjustment frame portion 16b that is mounted on the base portion so that the position or direction of the base portion 16a can be finely adjusted. On 16a, the motor 70 is fixed.

The supporting device 16 has a structure in which a tilting phase is generated on the motor output shaft 71 due to the elastic deformation of each part of the blower caused by a dynamic load when the blower is operated, and the position of the frame portion 16b relative to the base portion 16a is adjusted. , And obtained that the rotation center axis of the driving side pulley 11 becomes a support state of the motor 70 parallel to the rotation center axis of the driven side pulley 12.

In the cooling tower, a plurality of combinations of the size of the blower and the power of the motor driving the blower are set according to the required performance. Regarding the plurality of combinations of the blower and the motor corresponding to the required performance of the cooling tower, the motor 70 on the supporting device 16 is fixed with its output shaft 71 in a direction parallel to the rotation axis of the blower. The degree of inclination of the output shaft 71 when the dynamic load during operation is equivalent to the elastic deformation of each part of the blower can be used as adjustment data.

When the motor 70 is actually fixed on the cooling tower 50, by using the support device 16 to adjust the position of the motor 70, a predetermined motor support state can be obtained, that is, the direction of the motor output shaft 71 is operated with the blower. On the opposite side of the tilted side, the tilted angle corresponds to a known tilting amount (see Figure 5). With this, the motor 70 can be fixed in such a manner that when the blower operates, the rotation center axis of the driving side pulley 11 becomes parallel to the rotation center axis of the driven side pulley 12, and the position of the center axis direction of the driving side pulley 11 conforms to the driven The position of the side pulley 12 in the direction of the central axis, the direction of the belts erected on the two pulleys becomes a right angle with respect to the direction of the central axis of each pulley.

In this way, when the blower of the belt 13 is operated, the parallelism of the central axes of the driving side pulley 11, the driven side pulley 12, and the tensioning pulley 14d can be ensured. The running belt 13 exerts an excessive force to shift it in the width direction, and can appropriately exert the function of preventing the belt from meandering by the tensioning pulley 14d of the tension adjusting portion 14.

In addition, by using the data for adjusting the inclination of the shaft in advance, test the blower at each installation site of the cooling tower, and grasp the position shift between the pulleys caused by the deformation of each part of the blower in the operating state. Based on this, the position of the motor is finely adjusted to save time in the operation of setting the positional relationship of each pulley to an appropriate state.

Next, an operation state of the belt transmission mechanism based on the above configuration will be described.
Similar to known cooling towers, under normal cooling tower operating conditions, the following process is repeatedly performed: cooling medium such as circulating water that is heated by chiller or air-conditioning equipment to absorb heat and is heated from a predetermined circulation path It is taken out and flows to the inside of the heat exchange section of the cooling tower 50, and returns to the circulation path after heat exchange. In addition, external air is introduced into the heat exchange unit by the exhaust ventilation of the blower 60, and the heat medium is cooled by heat exchange with the air in the heat exchange unit. On the other hand, the air after the heat exchange is removed from the heat exchange unit. The air passes through the blower 60 and is exhausted above the cooling tower 50.

In this operating state, under predetermined control such as ON / OFF according to the load condition (circulating water temperature, circulating water amount, etc.), the motor 70 is operated to drive the side pulley 11 and the output shaft of the motor 70 71 rotates integrally. As the drive-side pulley 11 rotates, a belt 13 wound on the drive-side pulley 11 and stretched between the drive-side pulley 11 and the driven-side pulley 12 runs toward the driven-side pulley 12 to rotate the driven-side pulley 12 .

Immediately before the driven belt 13 reaches the driven-side pulley 12, the running belt 13 comes into contact with the tensioning pulley 14d of the tension adjusting portion 14 and presses the tensioning pulley 14d tilted by the force of the spring 14c, and the belt 13 is directed toward the inner periphery The side stretches out and becomes a moderate tension.

In addition, the tensioning pulley 14d is in a state of being in contact with the running belt 13 and exerts a known meandering prevention function to prevent the belt 13 from meandering or shifting in the belt width direction. The belt 13 controls the width direction movement It suppresses meandering or falling off from each pulley.

In this way, the driven side pulley 12 that is driven by the driving force of the belt 13 in the continuous running state rotates the integrated impeller 61 in the same rotation direction. The rotation of the driven-side pulley 12 and the impeller 61 is relative to the motor output shaft 71, and the speed is reduced according to the reduction ratio obtained based on the outer diameter of the driving-side pulley 11 and the outer diameter of the driven-side pulley 12.
The driven side pulley 12 and the impeller 61 integrated with the driven side pulley 12 are rotated to perform air blowing.

In the belt transmission mechanism 10, the driving-side pulley 11 and the belt 13, and the belt 13 and the driven-side pulley 12 are in constant contact with each other, and the driving force is transmitted by such mutual friction, thereby generating less noise during the operation of the blower, and The belt 13 is a flat belt and has excellent flexibility, and can reduce noise more than a case where a V-belt or the like is used for transmission. In addition, the flat belt has the advantages of being thin and having a small effect of strain due to bending, excellent durability, and suppressing bending resistance, improving transmission efficiency, and realizing reduction in energy consumption related to driving of the blower.

Further, in the cooling tower, according to the load or the condition of the surrounding environment, the following control is performed: temporarily stopping the air supply of the blower, that is, stopping the motor to stop the blower; but when the motor is stopped as described above, due to strong wind Or the wind pressure applied to the impeller from the exhaust gas adjacent to the cooling tower may cause the impeller to rotate in the direction opposite to the normal operation of the motor drive. In this case, the belt 13 wound on the driven-side pulley 12 that rotates integrally with the impeller 61 also runs in a direction opposite to that during the normal operation of the impeller 61. However, the tension adjustment unit 14 The tensioning pulley 14d is arranged close to the driven side pulley 12, and even if the running direction of the belt 13 becomes the reverse direction, the relationship between the belt 13 and the tensioning pulley 14d will not be basically changed. The 14d meandering prevention function is maintained as it is, and it can prevent the meandering of the belt 13 or falling off from each pulley.

As described above, in the belt transmission mechanism of this embodiment, not only a flat belt is used as the transmission belt 13 stretched between the driving-side pulley 11 and the driven-side pulley 12, but also the belt 13 that makes contact with the loose side of the belt 13 is used. The tension adjusting part 14 that tightens the pulley 14d and keeps it as a non-deflection of the belt 13 is set to also have a function of controlling the movement of the width direction of the belt 13 in operation and suppressing the meandering of the belt 13 and tightening the pulley 14d The rotation center position is located in a predetermined area near the driven-side pulley 12, so the belt 13 can be appropriately restricted by the tensioning pulley 14d of the tension adjusting section 14, in the case where the motor 60 is stopped, the fan 60 When the impeller rotates in the opposite direction to the normal operation by external force, and the running direction of the belt 13 changes to the opposite direction, the tension of the pulley 14d can also be used to suppress the deviation of the belt 13 , Prevent the belt from falling off from each pulley, can surely reduce the burden related to maintenance.

In addition, in the belt transmission mechanism of the above embodiment, the cooling tower to which the belt transmission mechanism is applied is configured as a cross-flow type, but it is not limited to this. If the blower is arranged on the upper part of the cooling tower, it can also be applied to convection. Other types of cooling towers.

In the belt transmission mechanism of the above-mentioned embodiment, the tension adjusting portion 14 is configured to tilt the arm portion 14b with respect to the fixed base portion 14a, and the tensioning pulley 14d attached to the arm portion 14b to the belt 13 Squeeze, but it is not limited to this, and the tension adjusting unit may be configured as follows: for example, a tensioning pulley moves linearly to squeeze the belt in a certain direction, and applies tension to the belt, etc. It moves to make the tension pulley contact the belt.

10‧‧‧Belt drive mechanism

11‧‧‧Drive side pulley

12‧‧‧ driven side pulley

13‧‧‧Belt

14‧‧‧Tension adjustment department

14a‧‧‧base

14b‧‧‧arm

14c‧‧‧Spring

14d‧‧‧Tighten the pulley

15‧‧‧ Cover

16‧‧‧ Support device

16a‧‧‧Base

16b‧‧‧Adjust the frame

50‧‧‧ cooling tower

60‧‧‧Air blower

61‧‧‧ Impeller

70‧‧‧motor

71‧‧‧output shaft

FIG. 1 is a top view of a cooling tower to which a belt transmission mechanism according to an embodiment of the present invention is applied.
FIG. 2 is an explanatory diagram of an open state of an outer cover of a belt transmission mechanism according to an embodiment of the present invention.
FIG. 3 is an explanatory diagram of a supporting state of a motor in a belt transmission mechanism according to an embodiment of the present invention.
FIG. 4 is an explanatory diagram of a state in which the position and direction of the adjustment frame portion and the motor in the belt transmission mechanism relative to the base of the supporting device in the embodiment of the present invention can be adjusted.
FIG. 5 is an explanatory diagram of the positional relationship of the pulleys in a stopped state and an activated state of a belt transmission mechanism according to an embodiment of the present invention.

Claims (5)

The utility model relates to a belt transmission mechanism for a cooling tower blower, which is used in a cooling tower for exchanging air introduced from the outside with a heat medium of a cooling object through the exhaust ventilation of the blower to transfer the impeller of the blower from the motor. The belt drive mechanism for rotary driving force is characterized by:
A drive side pulley, which is integrally arranged with the output shaft of the motor;
The driven side pulley is integrally arranged with the rotating shaft in the impeller of the blower;
A belt is a flat belt that is set between the driving side pulley and the driven side pulley; and a tension adjusting part is arranged between the driving side pulley and the driven side pulley, and uses a tension belt that is in contact with the belt The wheel exerts a force on the belt to keep it from flexing, and controls the movement in the width direction of the belt to suppress the meandering; and the tension adjusting unit is generally used for extracting and ventilating the blower in the place where the belt is erected between the pulleys. The belt running direction becomes the part where the belt is slack in the rotating state. The tension pulley is configured to be squeezed from the outside of the belt, and the rotation center of the tension pulley is located on the driven pulley. The distance of the rotation center position is within a range of about 35% or less of the distance between the shafts of the driving side pulley and the driven side pulley. For example, the belt transmission mechanism for a cooling tower blower in the scope of patent application No. 1 includes a support device that supports the above-mentioned motor to the side of the blower in an adjustable position, and the support device is in the predetermined motor support state as follows To fix the motor: By the elastic deformation of each part of the blower when the blower is operating, the output shaft of the driving side pulley is made parallel to the rotating center axis of the driven side pulley, and the motor output shaft is tilted in advance. For example, the belt transmission mechanism for the cooling tower blower of the scope of patent application No. 1 or 2 includes covering the above-mentioned driving side pulley, driven side pulley, belt and tension adjusting part,
The portion around the tension adjusting portion in the cover is in a state where there is no opening for communicating the inside of the cover with the outside, and the portion around the motor output shaft on the lower side of the drive-side pulley in the cover and the lower side of the driven-side pulley are set. At least one or both of the peripheral parts of the impeller rotating shaft are in a state in which at least an opening portion through which external air flows to the inside of the cover is generated. For example, the belt transmission mechanism for a cooling tower fan according to item 1 or 2 of the patent application, wherein the tension adjusting portion includes an arm portion that can be tilted around an axis parallel to the rotation center axis of the driven side pulley, and The tightening belt wheel system is rotatably mounted on the arm portion, and together with the arm portion, is biased by a force applying mechanism in a direction approaching the driven-side pulley to contact the belt. For example, the belt transmission mechanism for a cooling tower blower of claim 3, wherein the tension adjusting portion includes an arm portion that can be tilted around an axis parallel to the rotation center axis of the driven side pulley, and the pulling The tight-belt wheel system is rotatably mounted on the arm, and together with the arm, it is tilted by the urging mechanism in a direction approaching the driven-side pulley to contact the belt.