JPH0254448B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a thermomodulated fan device for cooling a radiator or the like of an automobile.

(Prior Art) Automotive engine cooling fans are usually driven by the engine via a fan belt.
In this case, the radiator is cold, especially in winter or immediately after the engine is started, so if the cooling fan is linked directly to the engine, the radiator will be cooled more than necessary. In order to prevent this, the cooling fan is driven from the engine via a fluid coupling, and the fluid flow rate is regulated by a bimetal that responds to the temperature near the fan case, thereby controlling the rotation speed of the cooling fan. A thermomodulated fan device has been proposed. (For example, Publication of Utility Model Publication No. 49-40228, Japanese Unexamined Patent Publication No. 55
(Refer to Publication No. 72930) (Problems to be Solved by the Invention) However, the fluid coupling in the above device divides the inside of the fan case into a storage chamber and an operating chamber, and the fluid is simply connected between the two chambers by an inlet and an inlet close to each other. Inflow and outflow are performed at the outlet, and the structure is not designed to circulate the entire fluid. Therefore, there is a problem in that part of the fluid remains in the working chamber and the temperature increases, accelerating deterioration of the fluid.

(Means for Solving the Problems) The present invention provides a fluid inflow passage on the inner circumference side of the fan case and an outflow passage on the outer circumference side, and uses centrifugal force due to rotation of the fan case to smoothly flow all the fluid. This is an attempt to solve the above problem by circulating the water.

That is, the specific means for this purpose includes: a fan case that is rotatably attached to a drive shaft and has fan blades, and to which the rotation of the drive shaft is transmitted via a working fluid; , a separator dividing the fluid into a working chamber for transmitting the rotation of the drive shaft to the fan case and a storage chamber for storing the fluid; an inflow passage for guiding the fluid in the storage chamber to the working chamber; a plurality of outflow passages that lead the fluid in the chamber to the storage chamber; one of the plurality of outflow passages is formed as a normally open passage that leads the fluid from the outer peripheral edge of the working chamber to the storage chamber; The inflow passage communicates the working chamber and the storage chamber on the inner circumferential side of the normally open outflow passage, and when the temperature near the fan case rises above the first set value, the inflow passage opens and the abovementioned inflow passage is opened. Thermomodulated fan device characterized by being provided with a control valve that opens another outflow passage among the plurality of outflow passages when the temperature rises to a second set value that is higher than the first set value. It is.

(Function) In the above thermomodulated fan device, when the temperature near the fan case is low,
The control valve closes the inflow passage, there is no circulation of fluid between the working chamber and the storage chamber, and the rotation of the drive shaft is transmitted to the fan case by the relatively small amount of fluid present in the working chamber, causing it to rotate at a low speed. do.

When the temperature near the fan case exceeds a first set value, the control valve opens the inflow passage, and fluid circulates between the working chamber and the storage chamber via the inflow passage and the normally open outflow passage. do. Therefore, as the amount of fluid in the working chamber increases, the rotational speed of the fan case increases.

In this case, the normally open outflow passage is formed to lead the fluid to the storage chamber from the outer peripheral edge of the working chamber where the largest centrifugal force acts, so the outflow of the fluid is promoted by the centrifugal force. , the amount of fluid circulated increases, that is, the circulation efficiency increases. Also,
As mentioned above, there is a normally open outflow passage at the outer periphery;
Moreover, since the inflow passage is located on the inner circumferential side of the normally open outflow passage, that is, the two are separated in the centrifugal direction, the entire fluid in the working chamber circulates between it and the storage chamber. In particular, the fluid does not remain in the outer circumference of the working chamber in a state where it is pressed against the outer circumferential surface of the working chamber due to the action of centrifugal force.

When the temperature near the fan case becomes equal to or higher than the second set value, other outflow passages other than the above-mentioned normally open outflow passage are also opened, thereby reducing the amount of fluid circulating between the working chamber and the storage chamber, and therefore the working chamber. The amount of fluid increases, and the rotational speed of the fan case further increases.

(Effects of the Invention) Therefore, according to the present invention, one of the plurality of outflow passages is a normally open passage that leads the fluid from the outer peripheral edge of the working chamber to the storage chamber, and the inflow passage is the normally open passage. The inlet passage is provided on the inner peripheral side than the outflow passage, and as the temperature near the fan case increases, the control valve sequentially opens the inflow passage and other outflow passages among the plurality of outflow passages. The rotation speed of the fan case can be changed according to the temperature, preventing the occurrence of surging phenomenon and reducing noise, and even at relatively low temperatures, it is possible to change the rotation speed of the fan case between the working chamber and the storage chamber. can be circulated with high efficiency without local stagnation,
It is possible to prevent the fluid from being locally overheated and deteriorated.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

Embodiment 1 This embodiment is shown in FIGS. 1 to 3, and is a case where a fluid outflow passage is provided in a fan case.

The thermomodulating fan device 1 has a drive shaft 2 driven by an engine (not shown),
A drive disk 3 is connected to the drive shaft, and a fluid communication hole 4 is formed in the drive disk. Furthermore, the case body 5 is rotatably connected to the drive shaft 2 via a bearing 8 so that a fan case 7 consisting of a case body 5 and a case cover 6 is located at the tip of the drive shaft 2; A fan blade 9 is fixed to the outer circumference of the case body 5 with bolts 10. Furthermore, a plate-shaped separator 11 is interposed between the case body 5 and the case cover 6, and the separator has first inflow passages 12 and 12 at symmetrical positions on the outside on the diametrical line.
However, second inflow passages 13, 13 are bored at symmetrical positions on the inside, and the space inside the fan case 7 is divided by the separator into a storage chamber 14 and an operating chamber 15, and the storage chamber has a A fluid 16 such as silicone oil is stored. Further, each flange portion 17, 17 of the case body 5 and the case cover 6 includes a first outflow passage 18 that runs from the outer periphery of the working chamber 15, bypasses the outer periphery of the separator 11, and reaches the outer periphery of the storage chamber 14.
18 and second outflow passages 19, 19 are formed, respectively, and the first outflow passage 18 and the second outflow passage 19 have approximately the same cross-sectional area as the first inflow passage 12 and the second inflow passage 13, respectively. The first outflow passage 18 always allows the storage chamber 14 and the working chamber 15 to communicate with each other. Each passage 1
The control valve 20 for opening and closing 2, 13, 19 is
Both have an inflow side valve body 21 and an outflow side valve body 22 with a concave central part, and the central parts are integrally connected, and the inflow side valve bodies 21 at both ends protrude in opposite directions. A first inflow valve part 23, 23 for opening and closing the first inflow passage 12, 12 and a second inflow valve part 24, 24 for opening and closing the second inflow passage 13, 13 are formed. On the other hand, the outflow side valve body 22 is formed with outflow valve parts 25, 25 that open and close the second outflow passages 19, 19. Furthermore, the first inflow valve parts 23, 23 have a notch 26,
26 is formed.

One end of the pivot pin 27 is attached to the center of the control valve 20, the middle part is pivotally supported to the case cover 6 via a bearing 28, and the other end is fixed to one end of a spiral bimetal 29. The other end is fixed to the case cover 6. In addition, 30,
30 is a weir that guides the fluid 16 flowing into the outer periphery of the working chamber 15 when the fan case 7 rotates to the first outflow passages 18, 18 and the second outflow passages 19, 19.

Next, the operation of the above embodiment will be explained.

Immediately after starting the engine, the temperature near the fan case, that is, the temperature of the air from the radiator is low and the bimetal 29 does not deform. respectively close the first inflow passage 12, the second inflow passage 13, and the second outflow passage 19 (solid line positions in FIG. 2), and in this state, the drive disk 3 is rotated by the drive shaft 2, but
Fluid 16 in reservoir chamber 14 is not introduced into working chamber 15 . Therefore, the rotational force of the drive disk 3 is transmitted to the fan case 7 by the residual fluid in the working chamber 15, and the fan case 7 rotates at a very low speed shown as _R0 in FIG. 3.

After that, when the engine is warmed up and the temperature near the fan case 7 rises to the state shown in Figure ₃ T1,
The bimetal 29 is slightly deformed and the control valve 20 is changed to the second
Rotate clockwise to the position shown by the chain line in the figure, and
Only the first inflow passages 12, 12 are opened by the notches 26 of the inflow valve parts 23, 23. At this time, the second outflow passages 19, 19 are connected to the outflow valve portions 25, 2 of the control valve 20.
It is closed by 5. Therefore, the fluid 16 in the storage chamber 14 is introduced into the annular space around the outer circumference of the working chamber 15 through the first inflow passage 12 and the communication hole 4 of the drive disk 3, and the rotational force of the drive disk 3 is caused by the introduced fluid. The rotation speed of the fan case 7 is R ₁ in Fig. 3.
increases to. The fluid 16 introduced through the first inflow passage 12 and the communication hole 4 flows to the outer periphery of the working chamber 15 by the rotation of the fan case, and flows through the weirs 30, 30 and the first outflow passages 18, 18. After that, it is returned to the storage chamber 14. Thereafter, the fluid 16 is circulated in the same manner.

After that, the temperature near the fan case 7 increased to the third level.
When it rises to T ₂ in the figure, the bimetal 29 deforms further and the control valve 20 also rotates further (clockwise in Figure 2), and the second inflow valve parts 24, 24 open the second inflow passages 13, 13. At the same time, the outflow valve parts 25, 25 open the second outflow passages 19, 19. Therefore, the fluid 16 in the storage chamber 14 flows through the first inflow passage 1
2, 12 and the second inflow passages 13, 13 into the working chamber 15, and the amount introduced is equal to that of the first inflow passage 1.
2 and 12, and the rotational force transmitted to the fan case 7 also becomes larger, so the rotational speed of the fan case 7 further increases and rises to R ₂ in FIG. 3. At this time, a large amount of fluid 16 introduced into the working chamber 15 is transferred to the weir 3.
0, 30, and is returned to the storage chamber 14 from the first outflow passages 18, 18 and the second outflow passages 19, 19, and the circulation action is performed as the rotation speed of the fan case 7 increases.
It becomes more active than in the case of R ₁ .

Example 2 This example is shown in FIGS. 4 and 5, and is a case where both the fluid inflow passage and the fluid outflow passage are provided in the separator.

The space inside the fan case 33 formed by combining the case body 31 and the case cover 32 is
A storage chamber 35 is formed by a separator 34 fixed to 1.
and a working chamber 36, and a drive disk 37 connected to the drive shaft 2 is accommodated in the working chamber. The separator 34 is formed into a dish shape in which one end edge of a cylindrical portion 39 is connected to the outer peripheral edge of a disk portion 38, and the other end portion of the cylindrical portion is fixed to the case body 31. Further, the disk portion 38 has first inflow passages 40, 4 at symmetrical positions with a large radius from the center of the disk portion.
0 has second inflow passages 41, 4 at symmetrical positions with a small radius.
1 are bored respectively, and the second inflow passage 41,
41 is arranged to be shifted from the first inflow passages 40, 40 in the rotational direction of a control valve 45, which will be described later. Furthermore, the cylindrical portion 39 has a first outflow passage 4.
2, 42 and second outflow passages 43, 43 are bored, the first outflow passage always communicates between the storage chamber 35 and the working chamber 36, and the second outflow passage 43, 43 communicates with the second inflow passage 41. , 41 so as to open and close at the same time. 44 is a weir, which directs the fluid 16 in the inner periphery of the cylindrical portion 39 to the first outflow passage 4.
2, 42 and second outflow passages 43, 43.

The control valve 45 for opening and closing each of the passages 40, 41, and 43 has a rectangular valve body 46 whose central portion extends toward the case cover 32, with one end of a rotating pin 47 fixed at the center thereof. Outflow valve parts 48, 48 are formed by bending both ends of 46 toward the case body 31, and slidingly contact the outer peripheral surface of the cylindrical part 39 to open and close the second outflow passages 43, 43. Further, between the outflow valve part and the center part of the valve body 46, there are first inflow valve parts 49, 49 and a second inflow valve part that open and close the first inflow passages 40, 40 and the second inflow passages 41, 41. 50 and 50 are formed, respectively. The other configurations are the same as in the first embodiment.

Therefore, immediately after starting the engine,
The control valve 45 closes the first inflow passages 40, 40, the second inflow passages 41, 41, and the second outflow passages 43, 43 (solid line position in FIG. 5). Thereafter, when the temperature near the fan case 33 reaches the state shown in _T1 in FIG. 3, the control valve 45 rotates clockwise (to the chain line position in FIG. 5) to open only the first inflow passages 40, 40. Therefore, the fluid 16 in the storage chamber 35 is introduced into the working chamber 36 through the first inflow passages 40, 40, and after increasing the rotational speed of the fan case 33 to _R1 in FIG. The water is returned to the storage chamber 35 through 42. Further, when the temperature reaches the state shown in FIG. 3 _T2 , the control valve 45 further rotates clockwise to open the second inflow passages 41, 41 and the second outflow passages 43, 43. Therefore, the fluid 16 in the storage chamber 35 is introduced into the working chamber 36 from the first inflow passages 40, 40 and the second inflow passages 41, 41, and after increasing the rotational speed of the fan case 33 to _R2 in FIG. , and is returned to the storage chamber 35 through the first outflow passages 42, 42 and the second outflow passages 43, 43.

Note that the first inflow passage 1 in each of the above embodiments
2, 40, the second inflow passages 13, 41 and the control valves 20, 45 connect the first inflow passage 51 and the second inflow passage 52 along the rotational direction of each control valve, as shown in FIG. A control valve 56 may be formed in which the first inflow valve part 54 and the second inflow valve part 55 are connected in the rotating direction so as to fit the inflow passage. You may.

[Brief explanation of drawings]

The drawings illustrate embodiments of the device of the present invention; FIG. 1 is a central vertical sectional view showing the main parts of the thermomodulating fan device, FIG. 2 is a partial front view taken along the line - in FIG. 1, and FIG. The figure is a characteristic curve diagram of a thermomodulated fan device, FIG. 4 is a central vertical sectional view of the main part in another embodiment, FIG. 5 is a partial front view taken along the - line in FIG. 4, and FIG. 6 is a It is a partial front view which shows the modification of an inflow passage and a control valve. 1... Thermomodulated fan device, 2...
Drive shaft, 7, 33... Fan case, 9... Fan blade, 11, 34... Separator, 12,
40, 51...first inflow passage, 13, 41, 52
...Second inflow passage, 14, 35...Storage chamber, 1
5, 36... Working chamber, 16... Fluid, 18, 42
...First outflow passage, 19, 43... Second outflow passage, 20, 45, 56... Control valve.

Claims (1)

[Scope of Claims] 1. A fan case that is rotatably attached to a drive shaft, has a fan blade, and to which the rotation of the drive shaft is transmitted via a working fluid; a separator that divides the fluid into a working chamber for transmitting the rotation of the drive shaft to the fan case and a storage chamber for storing the fluid; an inflow passage that guides the fluid in the storage chamber to the working chamber; a plurality of outflow passages that lead the fluid to the storage chamber, one of the plurality of outflow passages is formed as a normally open passage that leads the fluid from the outer peripheral edge of the working chamber to the storage chamber, and the inflow passage is , the working chamber and the storage chamber communicate with each other on the inner peripheral side of the normally open outflow passage, and when the temperature near the fan case rises above a first set value, the inflow passage is opened and the first A thermomodulating fan device comprising: a control valve that opens another outflow passage among the plurality of outflow passages when the temperature rises to a second set value that is higher than the set value.