CN220522896U - Cooling system and induced draft fan - Google Patents

Abstract

The present disclosure relates to a cooling system and draught fan, cooling system for cool off the bearing of draught fan, the bearing setting is in the bearing box, and the draught fan includes exhaust duct, and cooling system includes: the cooling fan is provided with an air inlet end and an air outlet end; one end of the first air inlet pipe is communicated with the air outlet end, and the other end of the first air inlet pipe is used for extending into the bearing box and facing the bearing; the air outlet part is communicated between the bearing box and the smoke exhaust pipeline; and the refrigerating part is used for cooling air and discharging the cooled air to the air inlet end. When the cooling device is used, air is cooled through the refrigerating part, the cooling air is sprayed to the bearing through the cooling fan and the first air inlet pipe to cool the bearing, the air subjected to heat exchange can be discharged into the smoke exhaust pipeline through the air outlet part and is discharged outdoors through the smoke exhaust pipeline, and the air subjected to heat exchange is prevented from being remained indoors to cause the indoor temperature to rise.

Description

Cooling system and induced draft fan

Technical Field

The present disclosure relates to the field of thermal power generation, and in particular, to a cooling system and an induced draft fan.

Background

In the thermal power plant, the draught fan is very important auxiliary equipment of the power plant, and comprises fan blades and bearings matched with the fan blades for discharging high-temperature flue gas generated by fire coal through a smoke exhaust pipeline. During use, due to the ambient temperature and the workload, the bearings in the bearing housing need to be cooled in real time to increase the service life of the bearings.

In order to solve the cooling problem, in the related art, forced ventilation is generally performed by providing an external cooling fan, specifically, the cooling fan directly transmits air outside the bearing housing to the inside of the bearing housing through an air inlet at the lower side of the bearing housing to cool the bearing, and the air is discharged from an air outlet at the upper part of the bearing housing after heat exchange. However, so design, because draught fan room ventilation effect is poor, and what add the draught fan was carried is high temperature flue gas, and the fan itself is also outwards radiating, and directly arrange indoor by the air outlet of upside after the cooling wind heat exchange in the bearing box, causes the draught fan indoor environment temperature to be high in many aspects, especially in summer high temperature season, and cooling fan inlet wind temperature is higher, and the cooling effect is not good, can't satisfy the cooling demand.

Disclosure of Invention

It is an object of the present disclosure to provide a cooling system and an induced draft fan to at least partially solve the problems existing in the related art.

To achieve the above object, the present disclosure provides a cooling system for cooling a bearing of an induced draft fan, wherein the bearing is disposed in a bearing housing, the induced draft fan includes a smoke exhaust duct, the cooling system includes: the cooling fan is provided with an air inlet end and an air outlet end; one end of the first air inlet pipe is communicated with the air outlet end, and the other end of the first air inlet pipe is used for extending into the bearing box and facing the bearing; the air outlet part is communicated between the bearing box and the smoke exhaust pipeline; and the refrigerating part is used for cooling air and discharging the cooled air to the air inlet end.

Optionally, one end of the first air inlet pipe, which is used for extending into the bearing box, is configured into a horn shape.

Optionally, the number of the cooling fans is multiple, and one end, far away from the bearing, of the first air inlet pipe is provided with multiple independent branch pipes, wherein each branch pipe is communicated with one cooling fan.

Optionally, a first check valve is provided in each branch pipe to allow only air to flow from the cooling fan to the bearing.

Optionally, the air outlet portion includes: a collection box; one end of the first air outlet pipe is communicated with the collecting box, and the other end of the first air outlet pipe is communicated with the smoke exhaust pipeline; and one end of each second air outlet pipe is used for being communicated with the bearing box, and the other end of each second air outlet pipe is communicated with the collecting box, wherein the second air outlet pipes are respectively used for being communicated with positions, far away from each other, on the bearing box.

Optionally, the air outlet part further comprises a third air outlet pipe with one end communicated with the first air outlet pipe, wherein a first stop switch is arranged in the first air outlet pipe, the third air outlet pipe is communicated with the first air outlet pipe and is positioned between the first stop switch and the collecting box, and a second stop switch is arranged in the third air outlet pipe.

Optionally, each second air outlet pipe is internally provided with a second one-way valve which only allows air to flow from the bearing box to the collecting box, a third one-way valve which only allows air to flow from the collecting box to the smoke exhaust pipeline is arranged at a position of the first air outlet pipe between the third air outlet pipe and the collecting box, and a fourth one-way valve which only allows air to flow from the collecting box to the smoke exhaust pipeline is arranged at a position of the first air outlet pipe between the third air outlet pipe and the first cut-off switch.

Optionally, the refrigeration part includes: a gas generator having a first gas outlet; the vortex tube cooler is provided with a first air inlet and a second air outlet, and the second air outlet faces the air inlet end; the second air inlet pipe is communicated between the first air outlet and the first air inlet; and the filtering pressure reducing valve is arranged in the second air inlet pipe, and a third stop switch is arranged in the second air inlet pipe.

Optionally, the second air outlet is configured as a horn.

According to a second aspect of the present disclosure, there is provided an induced draft fan comprising a bearing, a bearing housing, a smoke exhaust duct and the cooling system described above.

Through using above-mentioned technical scheme, during the use, the refrigeration portion can cool down air to further spray the air after cooling to bearing department through cooling fan and first air-supply line in order to cool down the bearing, the air after the heat exchange (absorb heat from the bearing) can be through exhaust duct and discharge outdoor through exhaust duct discharge exhaust duct into exhaust duct, avoids the hot air after the heat transfer to remain in order to lead to indoor temperature to rise in the room. By means of the design, the refrigerating part can cool down air, and then the cooling efficiency of the cooling system can be effectively improved.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:

FIG. 1 is a schematic diagram of a cooling system, with an air outlet not shown, shown schematically in accordance with the present disclosure;

fig. 2 is a schematic view of an air outlet portion not shown in fig. 1.

Description of the reference numerals

110-a bearing; 120-bearing housing; 130-a smoke exhaust duct; 200-cooling fans; 210-an air inlet end; 220-an air outlet end; 300-a first air inlet pipe; 310-branch pipes; 400-air outlet part; 410-a collection box; 420-a first air outlet pipe; 430-a second air outlet pipe; 440-a third air outlet pipe; 500-refrigerating part; 510-a gas generator; 520-vortex tube cooler; 521-a second air outlet; 530-a second air inlet pipe; 540-a filter pressure reducing valve; 610-a first one-way valve; 620-a second one-way valve; 630-a third one-way valve; 640-fourth one-way valve; 710—a first cut-off switch; 720-a second cut-off switch; 730-a third cutoff switch; 740-fourth cut-off switch.

Detailed Description

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.

In the present disclosure, unless otherwise indicated, terms of orientation such as "inner" and "outer" are defined based on the direction in which the relevant components are actually used, for example: the bearing is arranged in the bearing box, which means that the bearing is arranged in the accommodating space of the bearing box; the "inside" of each branch pipe is provided with a first check valve allowing only air to flow from the cooling fan to the bearing, respectively, means that the first check valve is provided in the inner accommodation space of the branch pipe.

In addition, in this disclosure, the terms "first," "second," etc. are used to distinguish one element from another without sequence or importance. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated.

Referring to fig. 1-2, according to a first aspect of the present disclosure, there is exemplarily provided a cooling system for cooling a bearing 110 of an induced draft fan, wherein the bearing 110 is disposed in a bearing housing 120, the induced draft fan includes a smoke exhaust duct 130, wherein the smoke exhaust duct 130 is used to exhaust high temperature flue gas of a boiler to the outside, and principles and structures thereof are well known to those skilled in the art, and not described herein too much. The cooling system includes a cooling fan 200 having an air inlet end 210 and an air outlet end 220, a first air inlet pipe 300 having one end connected to the air outlet end 220 and the other end for extending into the bearing housing 120 and facing the bearing 110, an air outlet portion 400 for communicating between the bearing housing 120 and the smoke exhaust duct 130, and a cooling portion 500 for cooling air and discharging it to the air inlet end 210.

The present disclosure is not limited in the kind of cooling fan 200, for example, in the embodiment of the present disclosure, the cooling fan 200 may be a movable vane-adjustable axial flow fan. Alternatively, in other embodiments, the cooling fan 200 may be a centrifugal fan, a mixed flow fan, or the like.

Referring to fig. 1, in an embodiment of the present disclosure, the bearing housing 120 may be an irregularly shaped cavity for accommodating the bearing 110, which is formed with a through hole opened in a wall thereof such that the first air inlet duct 300 may pass through the through hole and extend to the vicinity of the bearing 110 to deliver cooling air to the bearing 110. It should be noted that the shape of the bearing housing 120 and the opening position of the through hole shown in fig. 1 are only exemplary, and the present disclosure is not limited thereto, and the bearing housing 120 may be a regular hexahedron, for example.

Referring to fig. 1, in an embodiment of the present disclosure, a refrigeration unit 500 is used to cool down air and provide it to an air intake 210 of a cooling fan 200. Which may be specifically implemented by a vortex tube cooler 520 as will be described below. Furthermore, in other embodiments, the refrigeration unit 500 may also remove heat from the air via a plate heat exchanger to cool the air, as this disclosure is not limited in this regard.

In the embodiment of the present disclosure, the air outlet 400 may be a gas passage connected between the bearing housing 120 and the exhaust duct 130 to be able to discharge air in the bearing housing 120, which completes heat exchange (absorbs heat of the bearing 110), into the exhaust duct 130, and a specific structure will be described below.

Through the above technical scheme, the refrigerating part 500 can cool down the air, and further spray the cooled air to the bearing 110 through the cooling fan 200 and the first air inlet pipe 300 to cool down the bearing 110, and the air after heat exchange (absorbing heat from the bearing 110) can be discharged into the smoke exhaust pipe 130 through the air outlet part 400 and discharged out of the room through the smoke exhaust pipe 130, so that the hot air after heat exchange is prevented from remaining in the room to cause the increase of the indoor temperature. By means of the design, the refrigerating part 500 can cool down air, and therefore cooling efficiency of the cooling system can be effectively improved.

Referring to fig. 1, in an embodiment of the present disclosure, one end of the first air inlet duct 300 for extending into the bearing housing 120 may be configured in a horn shape. By such design, the horn-shaped opening can increase the flow area of the cooling air, so that the cooling air can be more uniformly sprayed to various positions of the bearing 110, and further, the heat exchange in the bearing housing 120 can be fully performed. In addition, in order to increase the flow area of the cooling air, in other embodiments, the end of the first air inlet pipe 300 extending into the bearing housing 120 may be formed with a plurality of branches, and the plurality of branches may face different positions of the bearing 110.

In order to enhance the cooling effect on the bearing 110, in the embodiment of the present disclosure, referring to fig. 1, the number of cooling fans 200 may be plural, and one end of the first air inlet duct 300, which is remote from the bearing 110, may be formed with a plurality of branch pipes 310 independent from each other, wherein each branch pipe 310 may communicate with one cooling fan 200. By such design, the cooling fans 200 simultaneously provide cooling air for the bearing 110, so that the flow speed (i.e. the flow rate) of the cooling air can be increased, and the cooling efficiency of the bearing 110 can be further improved. Moreover, the user can selectively turn on one or more cooling fans 200 according to the actual cooling condition of the bearing 110, so as to avoid energy consumption waste caused by turning on too many cooling fans 200.

The present disclosure does not limit the number of cooling fans 200, which may be two as shown in fig. 1, or may be three, four, etc. In addition to the above-described first air inlet pipes 300 forming the plurality of branch pipes 310, in other embodiments, the cooling system may also include a plurality of first air inlet pipes 300, where each first air inlet pipe 300 is provided with a cooling fan 200.

Further, in order to prevent the cooling air in one branch pipe 310 from flowing back to the cooling fan 200 through the other branch pipe 310, resulting in insufficient flow rate of the cooling air into the bearing housing 120, referring to fig. 1, in the embodiment of the present disclosure, each branch pipe 310 may be provided with a first check valve 610 (the direction of the side arrow of the first check valve 610 in fig. 1 is the allowable flow direction of the air) that only allows the air to flow from the cooling fan 200 to the bearing 110, respectively. By such design, when only one cooling fan 200 works, the cooling air in the branch pipe 310 can flow into the bearing box 120 completely, so that energy waste caused by reverse outflow from the rest branch pipes 310 is avoided.

The present disclosure does not limit the kind of the first check valve 610, and may be a barrier check valve, a cock check valve, a plug-in check valve, etc. In addition, the present disclosure also does not limit the kinds of the second check valve 620, the third check valve 630, and the fourth check valve 640, which will be described below, and will not be repeated in this regard.

Referring to fig. 2, in an embodiment of the present disclosure, the air outlet portion may include a collection box 410, a first air outlet duct 420, and a plurality of second air outlet ducts 430. Wherein, the first air outlet pipe 420 may have one end communicated with the collecting box 410 and the other end for communicating with the smoke exhaust duct 130, one end of each second air outlet pipe 430 may be used for communicating with the bearing box 120 and the other end communicated with the collecting box 410, wherein, the plurality of second air outlet pipes 430 are respectively used for communicating with positions far away from each other on the bearing box 120. It should be noted that, because the internal pressure of the smoke exhaust duct 130 is smaller than the internal pressure of the first air outlet duct 420, the air in the first air outlet duct 420 can be promoted to enter the smoke exhaust duct 130 by the negative pressure suction principle, so as to promote the flow of cooling air and improve the cooling efficiency of the bearing 110. By providing a plurality of second air outlet pipes 430, and the plurality of second air outlet pipes 430 are respectively connected to positions on the bearing housing 120 far away from each other, for example, four corner positions as shown in fig. 1, so that cooling air entering the bearing housing 120 can sufficiently circulate, uniformly fill the bearing housing 120, and enter the collecting box 410 through the corresponding second air outlet pipes 430. The present disclosure is not limited to the specific locations of the number and distribution of the second outlet pipes 430. For example, it may be 6, 8, etc., and the plurality of second air outlet pipes 430 are uniformly connected to the side walls of the bearing housing 120.

Referring to fig. 2, in an embodiment of the present disclosure, the air outlet part 400 may further include a third air outlet pipe 440 having one end connected to the first air outlet pipe 420, wherein a first cut-off switch 710 may be disposed in the first air outlet pipe 420, the third air outlet pipe 440 may be connected to a position of the first air outlet pipe 420 between the first cut-off switch 710 and the collecting box 410, and a second cut-off switch 720 may be disposed in the third air outlet pipe 440. Wherein, an end of the third air outlet pipe 440 remote from the first air outlet pipe 420 may directly open into the room, or other spaces. So designed, when the smoke exhaust duct 130 fails or needs to be overhauled, the second cut-off switch 720 can be turned on and the first cut-off switch 710 can be turned off, and at this time, the heat exchanged cooling air can be exhausted through the third air outlet duct 440. And in other cases, the second cut-off switch 720 may be selectively turned on, so that the hot air discharged from the third air outlet pipe 440 may heat the room or related devices (when there is a heating requirement). The present disclosure does not limit the kinds of the first and second cut-off switches 710 and 720, and may be an electric valve or may be a manual valve.

Referring to fig. 2, in the embodiment of the present disclosure, a fourth cut-off switch 740 may be further disposed on the first air outlet pipe 420, and the fourth cut-off switch 740 may cooperate with the first cut-off switch 710 to realize on-off of the first air outlet pipe 420. Specifically, in the embodiment of the present disclosure, the first cut-off switch 710 may be an electric valve, the fourth cut-off switch 740 may be a manual valve, and when in operation, the fourth cut-off switch 740 is normally open, and the on-off of the first air outlet pipe 420 can be controlled by remotely controlling the first cut-off switch 710. When the system fails and needs to be maintained, the first cut-off switch 710 and the fourth cut-off switch 740 can be closed simultaneously, and the two cut-off switches are closed simultaneously, so that the system is more stable and safer, and the fault tolerance rate is high (when one of the cut-off switches fails, the other cut-off switch can be ensured).

In order to prevent the back flow of the heat exchanged cooling air into the bearing housing 120, referring to fig. 2, in the embodiment of the present disclosure, each of the second outlet pipes 430 may be provided therein with a second check valve 620 allowing only the air to flow from the bearing housing 120 to the collection box 410, a position of the first outlet pipe 420 between the third outlet pipe 440 and the collection box 410 may be provided with a third check valve 630 allowing only the air to flow from the collection box 410 to the exhaust duct 130, and a position of the first outlet pipe 420 between the third outlet pipe 440 and the first cut-off switch 710 may be provided with a fourth check valve 640 allowing only the air to flow from the collection box 410 to the exhaust duct 130.

Referring to fig. 1, in an embodiment of the present disclosure, a refrigerating part 500 may include: a gas generator 510 having a first gas outlet; vortex tube cooler 520 having a first air inlet and a second air outlet 521, second air outlet 521 facing air inlet end 210; a second air inlet pipe 530 communicating between the first air outlet and the first air inlet; and a filter pressure reducing valve 540 disposed in the second air inlet pipe 530, wherein a third stop switch 730 may be disposed in the second air inlet pipe 530. With this design, the gas generator 510 may send compressed gas to the filter pressure reducing valve 540 for treatment, and then enter the vortex tube cooler 520 for cooling down, and be discharged to the air inlet end 210. As noted above, the present disclosure is not limited to a cooler and a plate heat exchanger may be substituted for vortex tube cooler 520. In addition, by providing the third stop switch 730, the refrigerating unit 500 can be selectively turned on and off according to the actual cooling requirement of the bearing 110, so as to prevent the refrigerating unit 500 from continuously operating when the cooling requirement is not high, resulting in energy waste.

Referring to fig. 1, in an embodiment of the present disclosure, the second air outlet 521 may be configured in a horn shape. By such design, the flow area of the cooled air can be increased, so that the cooled air can be more uniformly sprayed to the air inlet end 210. The air inlet end 210 may also be configured into a horn shape opposite to the second air outlet 521, so that the air flows of the two air flows are communicated, and the cooled air is prevented from being discharged to other positions, thereby avoiding energy waste.

According to a second aspect of the present disclosure, there is provided an induced draft fan, including the bearing 110, the bearing housing 120, the smoke exhaust duct 130, and the cooling system described above, and the induced draft fan has all the advantages of the cooling system described above, which will not be described herein.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.

In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.

Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims (9)

1. A cooling system for cool off the bearing of draught fan, wherein, the bearing sets up in the bearing box, the draught fan includes exhaust duct, its characterized in that, cooling system includes:

the cooling fan is provided with an air inlet end and an air outlet end;

one end of the first air inlet pipe is communicated with the air outlet end, and the other end of the first air inlet pipe is used for extending into the bearing box and facing the bearing;

the air outlet part is communicated between the bearing box and the smoke exhaust pipeline; and

a refrigerating part for cooling the air and discharging the cooled air to the air inlet end,

the refrigerating unit includes:

a gas generator having a first gas outlet;

the vortex tube cooler is provided with a first air inlet and a second air outlet, and the second air outlet faces the air inlet end;

the second air inlet pipe is communicated between the first air outlet and the first air inlet; and

a filtering pressure-reducing valve arranged in the second air inlet pipe,

wherein, be provided with the third in the second air-supply line and stop the switch.

2. The cooling system according to claim 1, wherein an end of the first air inlet pipe for extending into the bearing housing is configured in a horn shape.

3. The cooling system according to claim 2, wherein the number of the cooling fans is plural, and a plurality of branch pipes independent from each other are formed at an end of the first air inlet pipe away from the bearing, wherein each of the branch pipes communicates with one of the cooling fans.

4. A cooling system according to claim 3, wherein a first one-way valve is provided in each of said branch pipes, which allows only air to flow from said cooling fan to said bearing.

5. The cooling system of claim 1, wherein the air outlet comprises:

a collection box;

one end of the first air outlet pipe is communicated with the collecting box, and the other end of the first air outlet pipe is communicated with the smoke exhaust pipeline; and

and one end of each second air outlet pipe is used for being communicated with the bearing box, and the other end of each second air outlet pipe is communicated with the collecting box, wherein the second air outlet pipes are respectively used for being communicated with positions, far away from each other, on the bearing box.

6. The cooling system of claim 5, wherein the air outlet further comprises a third air outlet pipe with one end connected to the first air outlet pipe, wherein a first cut-off switch is disposed in the first air outlet pipe, the third air outlet pipe is connected to the first air outlet pipe at a position between the first cut-off switch and the collection box, and a second cut-off switch is disposed in the third air outlet pipe.

7. The cooling system according to claim 6, wherein a second check valve allowing only air to flow from the bearing housing to the collection housing is provided in each of the second air outlet pipes, a third check valve allowing only air to flow from the collection housing to the exhaust duct is provided at a position between the third air outlet pipe and the collection housing, and a fourth check valve allowing only air to flow from the collection housing to the exhaust duct is provided at a position between the third air outlet pipe and the first cutoff switch.

8. The cooling system of claim 1, wherein the second air outlet is configured as a horn.

9. An induced draft fan comprising a bearing, a bearing housing, a smoke evacuation conduit and a cooling system according to any one of claims 1 to 8.