阅读说明：本技术 一种工业风冷型空调换热器 (Industrial air-cooled air conditioner heat exchanger ) 是由 桑宪辉 吴玉麒 李彤 于 2021-03-04 设计创作，主要内容包括：本发明涉及换热设备技术领域,且公开了一种工业风冷型空调换热器,包括外壳,外壳内腔靠近一侧的位置上固定安装有涡旋压缩机,外壳内腔且靠近涡旋压缩机的位置上固定安装有隔板,涡旋压缩机输出口的一端固定套接有导管且导管贯穿隔板,导管的一端固定套接有导热装置且导热装置的数量为五个。涡旋压缩机处于高功率的工作状态,从涡旋压缩机输出口排出另流入至导热装置内部的导热载体总量较大,流速较快,单个限流排管的排出量无法平衡涡旋压缩机的排入量,从而使得后续的导热装置参与到散热中并增加参与排出的限流排管的数量,进而平衡涡旋压缩机排入量,从而实现了导热载体所流经的管道长度与涡旋压缩机的功率直接相关,提高了该装置的自动化。(The invention relates to the technical field of heat exchange equipment and discloses an industrial air-cooled air-conditioning heat exchanger which comprises a shell, wherein a vortex compressor is fixedly arranged at a position, close to one side, of an inner cavity of the shell, a partition plate is fixedly arranged at a position, close to the vortex compressor, of the inner cavity of the shell, a guide pipe is fixedly sleeved at one end of an output port of the vortex compressor and penetrates through the partition plate, a heat conduction device is fixedly sleeved at one end of the guide pipe, and the number of the heat conduction devices is five. The scroll compressor is in the operating condition of high power, it is great to flow in addition to the inside heat conduction carrier total amount of heat conduction device from the scroll compressor delivery outlet discharge, the velocity of flow is very fast, the discharge capacity of the unable balanced scroll compressor of discharge amount of single current-limiting calandria, thereby make subsequent heat conduction device participate in the heat dissipation and increase the quantity of participating in the carminative current-limiting calandria, and then balanced scroll compressor discharge capacity, thereby realized that the pipeline length that the heat conduction carrier flowed through is directly relevant with scroll compressor's power, the device's automation has been improved.)

1. The utility model provides an industry air-cooled air conditioner heat exchanger, includes shell (1), its characterized in that: fixed mounting has scroll compressor (2) on the position that shell (1) inner chamber is close to one side, fixed mounting has baffle (3) on the position that shell (1) inner chamber and be close to scroll compressor (2), the fixed cover in one end of scroll compressor (2) delivery outlet has pipe (4) and pipe (4) to run through baffle (3), the fixed cover in one end of pipe (4) has connect heat-transfer device (5) and heat-transfer device (5) quantity five, the bottom fixed mounting of heat-transfer device (5) has water conservancy diversion passageway (6) and is linked together with the inner chamber of heat-transfer device (5), heat-transfer device (5) are with crisscross mode and through water conservancy diversion passageway (6) interconnect, water conservancy diversion passageway (6) and heat-transfer device (5) constitute a whole and this holistic bottom fixed mounting have always arrange pipe (7) and be linked together with whole, the fixed surface of water conservancy diversion passageway (6) installs current-limiting calandria (8) and is linked together with water conservancy diversion passageway (6), the one end fixed mounting of current-limiting calandria (8) has vice calandria (9) and is linked together with current-limiting calandria (8), the one end and the total calandria (7) of vice calandria (9) are linked together, fixed mounting has speed controller (10) on the position that shell (1) inner chamber opposite side is close to the bottom, set up circular through-hole and this circular through-hole's inside fixed mounting fan (11) on the positive position of shell (1) surface, the fixed surface cover of heat conduction device (5), water conservancy diversion passageway (6), current-limiting calandria (8) and vice calandria (9.

2. An industrial air-cooled air-conditioning heat exchanger according to claim 1, characterized in that: the pipe diameter of the flow-limiting discharge pipe (8) is smaller than that of the flow-guiding channel (6).

3. An industrial air-cooled air-conditioning heat exchanger according to claim 1, characterized in that: heat conduction device (5) include heat pipe (51), the inside fixed mounting who offers rectangular channel and this rectangular channel on the position that heat pipe (51) surface is close to one end has busbar (52), the one end fixed mounting of heat pipe (51) has current inductor (53), the cover is equipped with main reset spring (54) on the position that heat pipe (51) is inside and be close to current inductor (53), the one end fixed mounting of main reset spring (54) has conducting strip (55), the one end fixed mounting of conducting strip (55) has vice reset spring (56), the one end fixed mounting of vice reset spring (56) has pressure receiving plate (57), heat pipe (51) surface has just been seted up circular through-hole and this circular through-hole is connected with water conservancy diversion passageway (6) on the position that is close to current inductor (53).

4. An industrial air-cooled air-conditioning heat exchanger according to claim 3, characterized in that: the quantity of having seted up swivelling chute (58) and swivelling chute (58) on the inner wall of heat pipe (51) is three and distributes with the annular array mode, sealing fin (59) have been cup jointed to the activity on being close to the position at middle part by pressure board (57) surface, the quantity that sealing fin (59) surface was provided with stopper (510) and stopper (510) is three and distributes with the mode of annular array.

5. An industrial air-cooled air-conditioning heat exchanger according to claim 3, characterized in that: the conductive strips (52) and the conductive sheets (55) are made of conductors, and the current inductor (53) is electrically connected with the conductive strips (52) and the conductive sheets (55).

6. An industrial air-cooled air-conditioning heat exchanger according to claim 4, characterized in that: the current inductor (53) is connected with the rotating speed controller (10) in a signal connection mode.

7. An industrial air-cooled air-conditioning heat exchanger according to claim 4, characterized in that: the rotating groove (58) is spiral and the limiting block (510) is matched with the rotating groove (58).

Technical Field

The invention relates to the technical field of heat exchange equipment, in particular to an industrial air-cooled air conditioner heat exchanger.

Background

In industrial production, the heat exchanger is a very common equipment, use mutually supporting with air conditioning equipment usually, the principle of heat exchanger is to pressurize the heat conduction carrier, and the heat conduction carrier can use this kind of material of freon usually, heat conduction carrier compression liquefaction boiling point risees and releases heat at the pressurized in-process, and discharge the heat of giving off through the form of forced air cooling, thereby realize the process of heat exchange, freon can flow in the pipeline usually, the pipeline can contact each other and carry out the heat conduction with fin group, freon will give fin group with heat transfer at the in-process that flows in the pipeline, make the temperature reduction of freon, the mode of this kind of heat exchange is comparatively simple and convenient, moreover, the steam generator is simple in structure, therefore, the carrier is low in cost, and application scope is most extensive.

Although the existing heat exchanger has many advantages, a certain limitation still exists, when the outdoor and indoor temperature difference is not large after the air conditioning system is started, the heat dissipation time required by the heat-conducting carrier is short, but the heat-conducting carrier still flows through the whole heat dissipation pipeline to cause low heat dissipation efficiency, and the rotating speed of the air cooling fan for heat dissipation generally keeps constant, even if the rotating speed of the air cooling fan is controlled by adopting a frequency conversion mode, the rotating speed of the fan cannot be directly related to the flowing speed and the flowing distance of the heat-dissipating carrier in the heat dissipation pipeline, so that the accuracy of temperature control is reduced.

Disclosure of Invention

Aiming at the defects of the prior industrial air-cooled air-conditioning heat exchanger in the background technology in the use process, the invention provides the industrial air-cooled air-conditioning heat exchanger which has the advantage of having a compression ratio to automatically determine the heat-conducting carrier in a heat dissipation device, and solves the problem that the heat-conducting carrier still can completely run a complete stroke path under the condition of low power of a compressor of the traditional heat exchanger.

The invention provides the following technical scheme: the utility model provides an industry air-cooled air conditioner heat exchanger, includes the shell, fixed mounting has scroll compressor on the position that shell inner chamber is close to one side, fixed mounting has the baffle on shell inner chamber and the position that is close to scroll compressor, the fixed cover of one end of scroll compressor delivery outlet has pipe and pipe to run through the baffle, the fixed number that has connect heat conduction device and heat conduction device of one end is five, heat conduction device's bottom fixed mounting has water conservancy diversion passageway and is linked together with heat conduction device's inner chamber, heat conduction device with crisscross mode and through water conservancy diversion passageway interconnect, water conservancy diversion passageway and heat conduction device constitute a whole and this holistic bottom fixed mounting have total calandria and whole be linked together, the surface fixed mounting of water conservancy diversion passageway has current-limiting calandria and current-, the one end fixed mounting of current-limiting calandria has vice calandria and is linked together with the current-limiting calandria, the one end and the total calandria of vice calandria are linked together, fixed mounting has speed controller on the position that shell inner chamber opposite side is close to the bottom, the inside fixed mounting who offers circular through-hole and this circular through-hole on the positive position of shell surface has air-cooled fan, the fixed cover of surface of heat conduction device, water conservancy diversion passageway, current-limiting calandria and vice calandria is equipped with the heat.

Preferably, the pipe diameter of the flow-limiting discharge pipe is smaller than that of the flow-guiding channel.

Preferably, the heat conduction device comprises a heat conduction pipe, a rectangular groove is formed in the position, close to one end, of the outer surface of the heat conduction pipe, a conductive strip is fixedly installed inside the rectangular groove, a current inductor is fixedly installed at one end of the heat conduction pipe, a main reset spring is sleeved in the position, close to the current inductor, inside the heat conduction pipe, a conductive strip is fixedly installed at one end of the main reset spring, an auxiliary reset spring is fixedly installed at one end of the conductive strip, a pressure plate is fixedly installed at one end of the auxiliary reset spring, a circular through hole is formed in the position, close to the current inductor, of the outer surface of the heat conduction pipe and connected with the flow guide channel, three rotating grooves are formed in the inner wall of the heat conduction pipe, the number of the rotating grooves is three, the rotating grooves are distributed in an annular array mode, the gasket surface is provided with the stopper and the quantity of stopper is three and distributes with annular array's mode.

Preferably, the conducting strip and the conducting strip are made of conductors, and the current inductor is connected with the conducting strip and the conducting strip in an electric connection mode.

Preferably, the current sensor is connected with the rotating speed controller in a signal connection way,

preferably, the rotating groove is spiral and the limiting block is matched with the rotating groove.

The invention has the following beneficial effects:

1. the invention fixes a guide pipe at one end of an output port of a scroll compressor and fixes a heat conduction device at one end of the guide pipe, so that a heat conduction carrier compressed by the scroll compressor enters the interior of the heat conduction device through the guide pipe, the gas content in a cavity in the inner cavity of the heat conduction pipe and positioned at the right side of a pressure-bearing plate in figure 5 is increased, the pressure in the cavity is increased, the pressure-bearing plate is pushed to move along the left direction in figure 5 until the pressure-bearing plate moves to the joint of the heat conduction device and a flow guide channel, so that the heat conduction carrier enters another heat conduction device through the flow guide channel, and meanwhile, a flow-limiting calandria is fixedly arranged on the outer surface of the flow guide channel, so that a part of the heat conduction carrier can flow into the flow-limiting calandria from the flow guide channel and is discharged into an auxiliary calandria and flows into a main, if the scroll compressor is in a low power state, the total amount of the heat-conducting carrier discharged from the output port of the scroll compressor and flowing into the heat-conducting device is small, and the flow rate is slow, at the moment, the discharge amount of a single current-limiting discharge pipe can balance the discharge amount of the scroll compressor, so that the heat-conducting carrier only flows through the heat-conducting device positioned at the top, the problem that the heat-conducting carrier still needs to flow through the whole heat-radiating pipeline when the scroll compressor is in a low power state in the traditional equipment to cause too low heat-radiating efficiency is avoided, the heat-radiating efficiency of the device in a low power mode is improved, if the scroll compressor is in a high power working state at the moment, the total amount of the heat-conducting carrier discharged from the output port of the scroll compressor and flowing into the heat-conducting device is large, the flow rate is high, the discharge amount of the single current-limiting discharge pipe cannot balance the discharge, and further, the discharge amount of the scroll compressor is balanced, so that the direct correlation between the length of a pipeline through which the heat-conducting carrier flows and the power of the scroll compressor is realized, and the automation of the device is improved.

2. The invention uses the conductive bar and the conductive sheet as conductors, so that the pressed plate can compress the main return spring and the auxiliary return spring when receiving the effect of increasing the pressure of the heat-conducting carrier and displace, and then drive the conductive sheet to displace synchronously, the conductive sheet can contact with the conductive bar in the displacement process, at the moment, the conductive sheet is connected with the conductive bar and the conductive sheet by the current inductor in an electric connection way, so that the current inductor, the conductive bar and the conductive sheet form a complete closed loop, the length of the conductive bar participating in the conduction can be reduced and the current in the closed loop can be increased in the process that the conductive sheet moves leftwards in the figure 5, at the moment, the current inductor can induce the current to be increased, and the current inductor is connected with the rotating speed controller by a signal connection way, and the magnitude signal of the current is transmitted to the rotating speed controller, so that the rotating speed controller controls the rotating speed of the air-, the problem that the traditional heat exchanger cannot control the rotating speed of the air cooling fan in a frequency conversion mode, the flowing speed and flowing distance of a heat dissipation carrier are directly related, and the temperature control accuracy is reduced is solved, and the refrigeration accuracy of the device is improved.

3. Cooperate through stopper and rotating groove, make the pressure receiving plate produce the removal under the effect that receives the pressure increase when, can make the gasket rotatory at the spiral rotating groove because of the stopper, thereby improve the in-service resistance of pressure receiving plate in the heat pipe, thereby improved and produced the required pressure threshold value of displacement by the pressure receiving plate, avoided receiving the plate and only set up the too high problem that makes the radiating efficiency of fan and the unmatched rate of flow of the heat conduction carrier in the heat pipe of the too high current that leads to in the current sensor of the displacement that can produce great distance under the low pressure of the inside of heat pipe that makes the pressure receiving plate through the mode that the activity cup jointed, the stability of the device operation has been improved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic cross-sectional view of the structure of the present invention;

FIG. 3 is a schematic view of a heat dissipation structure of the present invention;

FIG. 4 is a schematic view of a structural heat transfer device according to the present invention;

FIG. 5 is a schematic view of the internal structure of the heat conducting device according to the present invention;

FIG. 6 is a schematic cross-sectional view of a heat conducting device according to the present invention;

FIG. 7 is a schematic view of a sealing piece of the present invention.

In the figure: 1. a housing; 2. a scroll compressor; 3. a partition plate; 4. a conduit; 5. a heat conducting device; 51. a heat conducting pipe; 52. a conductive strip; 53. a current sensor; 54. a main return spring; 55. a conductive sheet; 56. a secondary return spring; 57. a pressure receiving plate; 58. a rotating tank; 59. sealing the sheet; 510. a limiting block; 6. a flow guide channel; 7. a main calandria; 8. a flow-limiting discharge pipe; 9. a secondary calandria; 10. a rotational speed controller; 11. an air-cooled fan; 12. the heat conducting plate set.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-7, an industrial air-cooled air-conditioning heat exchanger comprises a housing 1, a scroll compressor 2 is fixedly installed at a position close to one side of an inner cavity of the housing 1, a partition plate 3 is fixedly installed at a position close to the scroll compressor 2 and in the inner cavity of the housing 1, a guide tube 4 is fixedly sleeved at one end of an output port of the scroll compressor 2, the guide tube 4 penetrates through the partition plate 3, a heat conduction device 5 is fixedly sleeved at one end of the guide tube 4, the number of the heat conduction device 5 is five, the heat conduction device 5 comprises a heat conduction tube 51, a rectangular groove is formed at a position close to one end of the outer surface of the heat conduction tube 51, a conductive strip 52 is fixedly installed inside the rectangular groove, a current sensor 53 is fixedly installed at one end of the heat conduction tube 51, a main return spring 54 is sleeved at a, one end of the conducting strip 55 is fixedly provided with an auxiliary return spring 56, one end of the auxiliary return spring 56 is fixedly provided with a pressed plate 57, the outer surface of the heat conducting pipe 51 and the position close to the current sensor 53 are provided with circular through holes which are connected with the flow guide channel 6, the inner wall of the heat conducting pipe 51 is provided with three rotating grooves 58, the rotating grooves 58 are distributed in an annular array mode, the position close to the middle part of the outer surface of the pressed plate 57 is movably sleeved with a sealing strip 59, the outer surface of the sealing strip 59 is provided with three limiting blocks 510, the limiting blocks 510 are distributed in an annular array mode, the conducting strip 52 and the conducting strip 55 are made of conductors, the current sensor 53 is connected with the conducting strip 52 and the conducting strip 55 in an electric connection mode, the current sensor 53 is connected with the rotating speed controller 10 in a signal connection mode, the bottom of the heat conducting device 5 is fixedly provided with the flow guide channel 6, and, the heat conducting device 5 is connected with each other in a staggered way through the flow guide channel 6, the flow guide channel 6 and the heat conducting device 5 form a whole, the bottom of the whole is fixedly provided with a main exhaust pipe 7, the main exhaust pipe 7 is communicated with the whole, the outer surface of the flow guide channel 6 is fixedly provided with a flow-limiting exhaust pipe 8, the flow-limiting exhaust pipe 8 is communicated with the flow guide channel 6, the pipe diameter of the flow-limiting exhaust pipe 8 is smaller than that of the flow guide channel 6, one end of the flow-limiting exhaust pipe 8 is fixedly provided with an auxiliary exhaust pipe 9, the auxiliary exhaust pipe 9 is communicated with the flow-limiting exhaust pipe 8, one end of the auxiliary exhaust pipe 9 is communicated with the main exhaust pipe 7, the other side of the inner cavity of the shell 1 close to the bottom is fixedly provided with a rotating speed controller 10, the front position of the, the outer surfaces of the flow-limiting calandria 8 and the auxiliary calandria 9 are fixedly sleeved with a heat conducting plate group 12.

Wherein, a conduit 4 is fixedly sleeved at one end of the output port of the scroll compressor 2, and a heat conduction device 5 is fixedly sleeved at one end of the conduit 4, so that the heat conduction carrier compressed by the scroll compressor 2 enters the inside of the heat conduction device 5 through the conduit 4, the gas content in the cavity of the inner cavity of the heat conduction pipe 51 in fig. 5 and positioned at the right side of the pressed plate 57 is increased, the pressure in the cavity is increased, and the pressed plate 57 is pushed to move along the left direction in fig. 5 until the pressed plate 57 moves to the connection position of the heat conduction device 5 and the flow guide channel 6, so that the heat conduction carrier enters another heat conduction device 5 through the flow guide channel 6, meanwhile, the flow-limiting calandria 8 is fixedly installed on the outer surface of the flow guide channel 6, so that a part of the heat conduction carrier can flow into the flow-limiting calandria 8 from the flow guide channel 6 and is discharged into the auxiliary, and flows into the main exhaust pipe 7 through the auxiliary exhaust pipe 9, if the scroll compressor 2 is in a low power state at this time, the total amount of the heat-conducting carrier discharged from the output port of the scroll compressor 2 and flowing into the heat-conducting device 5 is small, the flow rate is slow, and at this time, the discharge amount of the single current-limiting exhaust pipe 8 can balance the discharge amount of the scroll compressor 2, so that the heat-conducting carrier at this time only flows through the heat-conducting device 5 located at the top, thereby avoiding the problem that the heat-conducting carrier still needs to flow through the whole heat-dissipating pipe when the scroll compressor 2 is in a low power state in the conventional equipment, improving the heat-dissipating efficiency of the device in a low power mode, if the scroll compressor 2 is in a high power working state at this time, the total amount of the heat-conducting carrier discharged from the output port of the scroll compressor 2 and flowing into the heat-conducting device 5 is large, the flow rate, therefore, the subsequent heat conduction device 5 participates in heat dissipation and increases the number of the current-limiting discharge pipes 8 participating in discharge, and further balances the discharge amount of the scroll compressor 2, so that the direct correlation between the length of the pipeline through which the heat conduction carrier flows and the power of the scroll compressor 2 is realized, and the automation of the device is improved.

Wherein, the conductive strip 52 and the conductive sheet 55 are made of conductive material, so that the pressed plate 57 compresses the main return spring 54 and the sub return spring 56 when receiving the effect of increasing the pressure of the heat conductive carrier and displaces, and then drives the conductive sheet 55 to displace synchronously, the conductive sheet 55 contacts with the conductive strip 52 in the displacement process, at this time, the current sensor 53 is connected with the conductive strip 52 and the conductive sheet 55 by the electric connection way, so that the current sensor 53, the conductive strip 52 and the conductive sheet 55 form a complete closed loop, the length of the conductive strip 52 participating in the conduction can be reduced and the current in the closed loop can be increased in the process that the conductive sheet 55 moves to the left in fig. 5, at this time, the current sensor 53 senses the current increase and is connected with the rotation speed controller 10 by the signal connection way of the current sensor 53, and the magnitude signal of the current is transmitted to the rotating speed controller 10, so that the rotating speed controller 10 controls the rotating speed of the air cooling fan 11, the problem that the accuracy of temperature control is reduced because the rotating speed of the air cooling fan 11 cannot be controlled in a frequency conversion mode by a traditional heat exchanger and the flowing speed and flowing distance of a heat dissipation carrier are directly related is solved, and the refrigeration accuracy of the device is improved.

Wherein, cooperate with the rotary groove 58 through stopper 510, make by the board 57 produce the removal under the effect that receives the pressure increase, can make the gasket 59 rotatory at spiral rotary groove 58 because of stopper 510, thereby improve by board 57 in the operation resistance of heat pipe 51, thereby improved by board 57 required pressure threshold value that produces the displacement, avoided by board 57 only set up the mode through the activity cup joint in the inside of heat pipe 51 make under the low pressure by board 57 can produce the displacement of great distance and lead to the too high unmatched problem of heat conduction carrier velocity of flow in current inductor 53 of radiating efficiency and the heat pipe 51 that makes the fan under the low pressure, the stability of the device operation has been improved.

The using method of the invention is as follows:

in the using process, the heat-conducting carrier compressed by the scroll compressor 2 enters the inside of the heat-conducting device 5 through the conduit 4, so that the gas content in the cavity of the inner cavity of the heat-conducting pipe 51 in fig. 5 and located on the right side of the pressure receiving plate 57 is increased, the pressure in the cavity is increased, the pressure receiving plate 57 is pushed to move in the leftward direction in fig. 5 until the pressure receiving plate 57 moves to the connection position of the heat-conducting device 5 and the flow-guiding channel 6, and thus the heat-conducting carrier enters another heat-conducting device 5 through the flow-guiding channel 6, and a part of the heat-conducting carrier can flow into the flow-limiting discharge pipe 8 from the flow-guiding channel 6 and discharge into the secondary discharge pipe 9 and flow into the main discharge pipe 7 in the process of passing through the flow-.

If scroll compressor 2 was in the state of low power this moment, the heat conduction carrier total amount that discharges from scroll compressor 2 delivery outlet and flow into to heat conduction device 5 inside is less, and the velocity of flow is slower, only can balance the volume of input of scroll compressor 2 through the discharge amount of single current-limiting calandria 8 this moment to make the heat conduction carrier this moment only flow through the heat conduction device 5 that is located the top.

If scroll compressor 2 is in the operating condition of high power this moment, it is great to flow into in addition to the inside heat conduction carrier total amount of heat conduction device 5 from 2 delivery outlets of scroll compressor, the velocity of flow is very fast, the discharge capacity of single current-limiting calandria 8 can't balance the discharge capacity of scroll compressor 2, thereby make subsequent heat conduction device 5 participate in the heat dissipation and increase the quantity of participating in the discharged current-limiting calandria 8, and then balance the discharge capacity of scroll compressor 2, thereby realized that the pipeline length that the heat conduction carrier flowed through is directly relevant with scroll compressor 2's power.

The pressure receiving plate 57 compresses the main return spring 54 and the sub return spring 56 while receiving the effect of increasing the pressure of the heat conductive carrier and displacing, and then drives the conductive sheet 55 to displace synchronously, during the displacement, the conducting strip 55 will come into contact with the conducting strip 52, at which time the conducting strip 52 and the conducting strip 55 are electrically connected by means of the current sensor 53, so that the current sensor 53, the conductive strip 52 and the conductive strip 55 form a complete closed loop, during the movement of the conductive strip 55 to the left in fig. 5, the length of the conductive strip 52 participating in the conductive operation is decreased, and the current in the closed loop is increased, at which time the current sensor 53 senses the increase of the current, and is connected with the rotational speed controller 10 by means of signal connection through a current sensor 53, and transmits a magnitude signal of the current to the rotational speed controller 10 so that the rotational speed controller 10 controls the rotational speed of the air-cooling fan 11.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.