JP3894996B2 - Fan device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fan device provided in a combustor such as a forced supply / exhaust hot water heater.
[0002]
[Prior art]
For example, a forced water supply / exhaust type (FF type) water heater is provided with a fan device to discharge the exhaust gas after combustion to the outside. This type of fan device includes a motor, a fan attached to the motor shaft, and a fan case that accommodates the fan. In addition, a motor shaft is provided between the motor and the fan case to cool the motor. A self-cooling fan attached to is provided. This self-cooling fan is provided with a partition plate (heat insulating plate) that partitions the self-cooling fan with a gap between the fan cases in order to prevent heat transfer from adjacent fan cases.
[0003]
Furthermore, since the fan and the self-cooling fan use a common motor shaft, in order to prevent this motor shaft from coming into contact with the heat insulating plate and the fan case, the mechanical shaft is not applied. A shaft hole (hereinafter referred to as “hole”) having a diameter larger than a predetermined diameter is formed. That is, a first hole is formed in the partition plate, and a second hole is formed in the fan case, and the motor shaft passes through the first hole and the second hole.
[0004]
[Problems to be solved by the invention]
However, although the noise reduction of the water heater is desired, the following noise may be generated due to the first hole and the second hole. In other words, when the water heater is not operated in a highly airtight room such as an apartment house, when the ventilation fan is driven, the pressure inside the highly airtight room where the water heater is set becomes the pressure outside the room. On the other hand, the negative pressure may be about -7 mmAq (water column) to -20 mmAq, for example. When such a negative pressure occurs, air flows through the water heater through the water heater fan and the self-cooling fan, and air flows in the space around the motor shaft in the first hole and the second hole. Flowing may cause harsh noise.
[0005]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a fan device that can solve the above-described problems and can suppress generation of noise during non-operation.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 is a fan device that is disposed in a combustor and exhausts exhaust gas to the outside, a motor, a fan attached to the motor shaft, a fan case that accommodates the fan, A partition plate is disposed between the motor and the fan case, and includes a self-cooling fan that is attached to the motor shaft and cools the motor, and a partition plate that partitions the self-cooling fan and the fan case with a space therebetween. In the fan device that passes through the motor shaft in which each fan is mounted in the first hole formed in the first hole and the second hole formed in the fan case, the first hole and the second hole are provided with a space around the motor shaft. A closing member for closing the space between the partition plate and the fan case is disposed between the partition plate and the fan case at a periphery of the first hole and the second hole. Than is.
[0007]
In the first aspect of the invention, the interior of the chamber in which the combustor is disposed is closed by closing the space between the partition plate and the fan case in the periphery of the first hole and the second hole using the closing member. Even if it becomes a negative pressure, noise generated by the passage of air through the first hole and the second hole can be suppressed, and since only a closing member need be arranged, noise countermeasures can be easily taken. Although the cause of noise that has conventionally occurred is not necessarily clear, it is considered that the air flowing around the periphery of the case defining the first hole and the second hole becomes turbulent and becomes wind noise. On the other hand, as a result of various tests, it was possible to suppress the generation of noise when such a closing member was arranged, but turbulent flow occurred in the air flow passing through the first hole and the second hole. It is thought that the noise was suppressed because it disappeared or the degree of turbulent flow was reduced.
[0008]
The invention described in claim 2 is a fan device that is disposed in a combustor and discharges exhaust gas to the outside, a motor, a fan attached to the motor shaft, a fan case that accommodates the fan, A partition plate is disposed between the motor and the fan case, and includes a self-cooling fan that is attached to the motor shaft and cools the motor, and a partition plate that partitions the self-cooling fan and the fan case with a space therebetween. In the fan device that passes through the motor shaft in which each fan is mounted in the first hole formed in the first hole and the second hole formed in the fan case, the first hole and the second hole are provided with a space around the motor shaft. And a rising portion is formed around the second hole of the fan case toward the partition plate, and the rising portion covers at least a part of the gap. It is intended to.
[0009]
In the second aspect of the present invention, as described above, as a result of various tests, the space between the partition plate and the fan case is partially closed using the rising portion, and the room is negative when the fan device is not used. Even in the case of pressure, the noise in the first hole and the second hole could be suppressed. In this case, it was possible to easily suppress noise simply by adding processing to the existing fan case.
[0010]
Invention of Claim 3 is a fan apparatus for arrange | positioning in a combustor and discharging exhaust gas outside, A motor, a fan attached to this motor shaft, A fan case which accommodates this fan, A partition plate is disposed between the motor and the fan case, and includes a self-cooling fan that is attached to the motor shaft and cools the motor, and a partition plate that partitions the self-cooling fan and the fan case with a space therebetween. In the fan device that passes through the motor shaft in which each fan is mounted in the first hole formed in the first hole and the second hole formed in the fan case, the first hole and the second hole are provided with a space around the motor shaft. The inner diameter of the first hole of the partition plate and the inner diameter of the second hole of the fan case are set to different sizes .
[0011]
In the invention according to claim 3 as well, as a result of various tests, noise in the first hole and the second hole can be suppressed even when the chamber in which the combustor is disposed becomes negative pressure. Since it is only necessary to change the inner diameter of the hole and the second hole, noise countermeasures can be easily taken.
[0012]
[0013]
[0014]
[0015]
[0016]
The invention according to claim 4 is the invention according to any one of claims 1 to 3 , wherein the combustor is a forced water supply / exhaust type water heater.
[0017]
In the invention according to claim 4 , particularly in a forced air supply / exhaust type water heater (FF water heater), the fan case is always in communication with the outside air. Because of the difference in pressure, air flows easily from outside air through the first hole and the second hole from the fan case. Therefore, it is particularly effective to suppress noise caused by the air flow.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a state in which a forced air supply / exhaust type (FF type) flow water heater provided with the fan device of the present invention is installed, and FIG. 2 shows the flow water heater 1 of FIG. 1 in a simplified manner. As shown in FIGS. 1 and 2, the air supply / exhaust pipe 3 of the flow water heater 1 is connected to the outside air from the wall W of the room R. This flow water heater 1 has a heat exchanger 5 for hot water supply and a heat exchanger 7 for flow hot water, and these heat exchanger 5 and heat exchanger 7 are heated by burners 9 and 11, respectively. Hot water can be supplied. The upper part of the heat exchanger 5 and the heat exchanger 7 is an exhaust part 13 for combustion gas, and this exhaust part 13 is connected to the exhaust pipe 17 of the supply / exhaust pipe 3. Is provided with an exhaust fan device 15. An air supply pipe 19 of the exhaust unit 13 supplies combustion air to the burners 9 and 11 side. When this flow hot water heater 1 is used, the interior of the highly airtight room R is exhausted by the fan 21 disposed on the wall W1 and becomes negative pressure.
[0019]
In FIG. 2, the fan device portion is shown in an enlarged manner, but the solid line arrow X shown in FIG. 2 is in a normal use state where the flow water heater 1 is operated and the fan device 15 and the fan 21 are operated. It shows the direction of wind flow. On the other hand, the broken line arrow Y indicates the flow direction of the wind when the flow of the hot water heater 1 is stopped and the operation of the fan device 15 is stopped, but the fan 21 rotates and the inside of the room R becomes negative pressure. ing.
[0020]
Here, the structure of the fan device 15 will be described. The fan device 15 shown in FIG. 2 includes a motor 31, a fan case 37 that houses a fan 35 attached to the shaft 33 of the motor 31, and a self-cooling fan 39. In order to prevent heat from the fan case 37, a partition plate (heat insulating plate) is disposed with a gap therebetween. The self-cooling fan 39 is attached to the shaft 33 of the motor 31 in order to cool the motor 31, and cools the motor when the motor 31 is driven.
[0021]
FIG. 3 shows the structure of the fan device 15 in detail, and the motor shaft 33 is a common shaft for the self-cooling fan 39 and the fan 35 and rotates them simultaneously. As shown in FIGS. 3 to 5, the self-cooling fan 39 prevents heat from the exhaust gas from directly affecting the motor 31 by the fan case 43, and prevents heat transfer from the fan case 43 by the partition plate 41. is doing. The fan 35 is covered with a fan case 37, and the fan case 37 has a fan mounting plate 37a.
[0022]
FIG. 6 shows the structure of the fan device 15 shown in FIGS. 3 to 5 in an enlarged manner. The motor shaft 33 passes through the first hole 51 of the partition plate 41 and the second hole 53 of the fan mounting plate 37a of the fan case 37 so that the motor shaft 33 does not contact the partition plate 41 and the fan mounting plate 37a. Clearances S1 and S2 are formed.
[0023]
Here, the first hole 51 and the second hole are formed between the space cross-sectional area A obtained by subtracting the cross-sectional area of the motor shaft 33 from the formation area of the second hole 53 of the fan mounting plate 37a, and between the partition plate 41 and the fan case 37. The relationship between the circumferential area B of the cylindrical space formed by the peripheral portion with 53 is preferably B / A ≦ 3. Thus, the relationship of B / A was specified because the noise test was performed with various B / A as follows, and the generation of noise could be suppressed with B / A ≦ 3.
[0024]
In the test of each structure shown below, an environment similar to the sealed room shown in FIG. 1 described above is set and the water heater according to the present embodiment is set, and an environment similar to the sealed room is set. An environment in which the room can be varied by 0 to −20 mmAq (water column) from the outside was set. In this state, as shown in FIG. 7 to FIG. 11, tests were performed by changing various structures of the fan device. In addition, multiple people (three people) conducted a noise confirmation test at a position about 1 m away from the water heater. If one person sensed the sound, it was judged that there was noise, If no sound was detected, it was judged that there was no noise. The results will be described below.
[0025]
The fan device 15 shown in FIG. 7 is the most preferred embodiment. In FIG. 7, the space between the partition plate 41 and the mounting plate 37a of the fan case 37 is closed so that B / A = 0. A closing member 61 is arranged. The closing member 61 is made of heat-resistant silicon or rubber, for example. In the case of the structure shown in FIG. 7, the diameter of the first hole and the second hole is 10 mm, the diameter of the motor shaft 33 is 8 mm, the spatial cross-sectional area A is 28 mm ² , and the peripheral area B is zero. , B / A is zero. When the above-described noise test was performed with this structure, no one perceived sound.
[0026]
In the test example of the fan device 15 having the structure shown in FIG. 8, the rising portion 63 is formed on the fan mounting plate 37 a of the fan case 37 toward the partition plate 41. The raised portion 63 is processed from below by burring (inside out) or the like. In the case of the structure shown in FIG. 8, the diameters of the first hole 51 and the second hole 53 are both 10 mm, the diameter of the shaft 33 of the motor 31 is 8 mm, the space sectional area A is 28 mm ² , and the circumferential area B Was 52 mm ² and B / A was 1.86. Even in the case of this structure, no one sensed sound in the noise test described above.
[0027]
In the test example in the fan device 15 having the structure shown in FIG. 9, the diameter of the second hole 53 is set larger than the diameter of the first hole 51. The diameters of the first hole 51 and the second hole 53 are 11 mm and 11.7 mm, the diameter of the shaft 33 of the motor 31 is 9 mm, the spatial sectional area A is 44 mm ² , the peripheral area B is 114 mm ^2, and B / A Was 2.59. Even in the case of this structure, no one sensed sound in the noise test described above.
[0028]
In the test example of the fan device 15 having the structure shown in FIG. 10, the diameter of the second hole 53 is set to be larger than the diameter of the first hole 51. That is, the diameter of the second hole 53 was 12 mm, the diameter of the motor shaft 33 was 8 mm, the spatial sectional area A was 63 mm ² , the peripheral area B was 124 mm ^2, and B / A was 1.97. Even in the case of this structure, no one sensed sound in the noise test described above.
[0029]
In the test example in the fan device 15 having the structure shown in FIG. 11, the diameter of the first hole 51 is set larger than the diameter of the second hole 53. Therefore, B / A was 3 or less. Even in the case of this structure, no one sensed sound in the noise test described above.
[0030]
A fan device 215 having a structure shown in FIG. 12 shows a comparative example. That is, the diameter of the first hole 51 and the second hole 53 is 10 mm, the diameter of the shaft 33 of the motor 31 is 8 mm, the spatial sectional area A is 28 mm ² , the peripheral area B is 104 mm ^2, and B / A is 3.7. Met. In the case of this structure, everyone sensed sound in the noise test described above.
[0031]
In the embodiment described above, the fan device of the flow hot water heater has been described. However, the present invention is not limited to this and is applied as a fan device such as another combustor, for example, a forced air supply / exhaust type oil fan heater. You can also. However, in the above-described forced air supply / exhaust water heater (FF water heater), the fan case is always in communication with the outside air through the outside air intake duct. Because of the differential pressure, air flows from the fan case to the air through the first hole 51 and the second hole 53, which is particularly effective for noise suppression.
[0032]
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.
[0033]
For example, as shown in FIG. 13, one peripheral portion that defines the first hole 51 or the second hole 53 is raised to form a rising portion 63, and the rising portion 63 is brought into contact with the other peripheral edge. The space between the partition plate and the fan case may be closed. In this case, B / A is zero.
[0034]
【The invention's effect】
According to the first aspect of the present invention, noise in the first hole and the second hole can be suppressed even when the chamber in which the combustor is disposed using the closing member becomes negative pressure, and the closing member is disposed. You can easily take measures against noise. Thereby, the fan device can suppress the generation of noise when not used in a highly airtight room.
[0035]
In the invention according to claim 2, the noise in the first hole and the second hole can be suppressed even when the chamber in which the combustor is disposed by using the start-up portion becomes negative pressure, and it is normally used. Noise measures can be taken simply by processing the fan case. Thereby, the fan device can suppress the generation of noise when not used in a highly airtight room.
[0036]
In the third aspect of the present invention, noise in the first hole and the second hole can be suppressed even when the chamber in which the combustor is disposed has a negative pressure, and the inner diameters of the first hole and the second hole are reduced. Since it only needs to be changed, noise countermeasures can be easily taken.
[0037]
[0038]
The invention according to claim 4 can effectively suppress noise in a forced air supply / exhaust water heater (FF water heater) that is particularly susceptible to noise.
[0039]
[Brief description of the drawings]
FIG. 1 is a view showing a water heater provided with a fan device of the present invention.
FIG. 2 is a simplified view of a water heater provided with the fan device shown in FIG.
FIG. 3 is a diagram showing in detail the structure of the fan device shown in FIG. 1;
FIG. 4 is a side view showing a fan case of the fan device.
FIG. 5 is a plan view showing a fan case of the fan device.
FIG. 6 is an enlarged view showing the structure of a fan device.
FIG. 7 is a cross-sectional view showing a structure of a fan device according to the present invention.
FIG. 8 is a cross-sectional view showing another structure of the fan device of the present invention.
FIG. 9 is a cross-sectional view showing another structure of the fan device of the present invention.
FIG. 10 is a cross-sectional view showing another structure of the fan device of the present invention.
FIG. 11 is a cross-sectional view showing another structure of the fan device of the present invention.
FIG. 12 is a cross-sectional view showing the structure of a fan device according to a comparative example.
FIG. 13 is a cross-sectional view showing a modification of the present invention.
[Explanation of symbols]
1 Water heater (combustor)
15 Fan device 31 Motor 33 Motor shaft 37 Fan case 39 Self-cooling fan 41 Partition plate 51 First hole 53 Second hole 61 Closing member 63 Start-up portion A Spatial cross-sectional area A
B Circumference area B

Claims (4)

  A fan device that is disposed in a combustor and discharges exhaust gas to the outside, and is disposed between a motor, a fan attached to the motor shaft, a fan case that accommodates the fan, and the motor and the fan case. A self-cooling fan that is attached to the motor shaft and cools the motor, and a partition plate that partitions the self-cooling fan and the fan case with a space therebetween, a first hole formed in the partition plate, In the fan device that passes through the motor shaft in which each fan is mounted in the second hole formed in the fan case, the first hole and the second hole have a space around the motor shaft, and the partition plate and the fan case A fan device characterized in that a closing member for closing a space between the partition plate and the fan case is disposed between the first hole and the second hole.   A fan device that is disposed in a combustor and discharges exhaust gas to the outside, and is disposed between a motor, a fan attached to the motor shaft, a fan case that accommodates the fan, and the motor and the fan case. A self-cooling fan that is attached to the motor shaft and cools the motor, and a partition plate that partitions the self-cooling fan and the fan case with a space therebetween, a first hole formed in the partition plate, In the fan device that passes through the motor shaft in which each fan is mounted in the second hole formed in the fan case, the first hole and the second hole have a space around the motor shaft, and the second of the fan case A fan device, wherein a rising portion is formed in a peripheral portion of the hole toward the partition plate, and the rising portion covers at least a part of the gap. A fan device that is disposed in a combustor and discharges exhaust gas to the outside, and is disposed between a motor, a fan attached to the motor shaft, a fan case that accommodates the fan, and the motor and the fan case. A self-cooling fan that is attached to the motor shaft and cools the motor, and a partition plate that partitions the self-cooling fan and the fan case with a space therebetween, a first hole formed in the partition plate, In the fan device that passes through the motor shaft in which each fan is mounted in the second hole formed in the fan case, the first hole and the second hole have a space around the motor shaft, and the first of the partition plates The fan device , wherein the inner diameter of the hole and the inner diameter of the second hole of the fan case are set to different sizes . Fan device according to any one of claims 1 to 3 wherein the combustor characterized in that it is a water heater of forced supply and exhaust type.

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