JPH106755A - Viscous heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive viscous heater by forming a rotor into a flat plate shape having front and rear end surfaces longer than a radius from the axial center of a drive shaft. SOLUTION: A shaft sealing device 12 is provided in the boss 2a of a front plate 2 so as to be adjacent to a heat generation room 8. A bearing device 13 is provided in the boss 1 of a front housing main body 1. Then, a drive shaft 14 is supported by the shaft sealing device 12 and the bearing device 13 so as to be turned. Also, a rotor 15 of a flat circular plate shape having front and rear end surfaces longer than a radius from the axial center of the drive shaft 14 is inserted by pressure into the rear end of the drive shaft 14. This rotor 15 is turned in the heat generation room 8. Silicone oil is supplied as viscous fluid to a gap between the wall surface of the heat generation room 8 and the outer surface of the rotor 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a viscous heater in which a viscous fluid generates heat by shearing and exchanges heat with a circulating fluid circulating in a radiating chamber for use as a heating heat source.

[0002]

2. Description of the Related Art Hitherto, Japanese Patent Application Laid-Open No. 2-246823 discloses a viscous heater used for a vehicle heating device. In this viscous heater, the front and rear housings are fastened by through bolts in a state of being opposed to each other, and a heat generating chamber is formed inside and a water jacket is formed outside the heat generating chamber. In the water jacket, circulating water is taken in from an inlet port and circulated from an outlet port to be sent to an external heating circuit. A drive shaft is rotatably supported on the front housing via a bearing device, and a rotor that is rotatable in the heating chamber is fixed to the drive shaft. The wall surface of the heating chamber and the outer surface of the rotor form a labyrinth groove that is close to each other, and a viscous fluid such as silicon oil is interposed in the gap between the wall surface of the heating chamber and the outer surface of the rotor.

In this viscous heater incorporated in a vehicle heating device, if a drive shaft is driven by an engine,
Since the rotor rotates in the heating chamber, the viscous fluid generates heat by shearing in the gap between the wall surface of the heating chamber and the outer surface of the rotor.
This heat is exchanged with the circulating water in the water jacket, and the heated circulating water is supplied to the heating of the vehicle in the heating circuit.

[0004]

However, the above-mentioned conventional viscous heater employs a rotor having a labyrinth groove, and also forms a heat generating chamber so as to cover the front and rear wall surfaces of the housing facing the front and rear end faces of the rotor. A labyrinth groove is formed. For this reason, in such a viscous heater, since the manufacture of the rotor and the housing is troublesome,
This leads to an increase in manufacturing costs. In particular, in the above-mentioned conventional viscous heater, since these labyrinth grooves are concentric around the axis, if these are manufactured with extremely high precision and are not assembled, the rotor will not move with the inclination of the drive shaft. Will interfere.

An object of the present invention is to provide a viscous heater which is easy to manufacture and can be manufactured at low cost.

[0006]

[Means for Solving the Problems]

(1) The viscous heater according to the first aspect of the present invention has a housing in which a heat generating chamber and a heat radiating chamber adjacent to the heat generating chamber for circulating a circulating fluid are formed, and the housing is rotatably supported via a bearing device. A driving shaft, a rotor rotatably provided by the driving shaft in the heating chamber, and a viscous member interposed in a gap between a wall surface of the heating chamber and an outer surface of the rotor, the heat being generated by the rotation of the rotor. In a viscous heater having a fluid, the rotor has a flat plate shape having front and rear end faces whose radius from the axis of the drive shaft is longer than the shaft length.

With this viscous heater, it is easy to manufacture a flat rotor, so that the manufacturing cost can be reduced. Also, because it does not have a labyrinth groove,
Even if an unavoidable accuracy error is allowed, the rotor does not interfere with the housing due to the inclination of the drive shaft. In addition, a concave portion and a convex portion may be formed on the front and rear end surfaces of the rotor, and a through hole penetrating the front and rear end surfaces may be formed. These are different from the labyrinth grooves which are close to each other on the front and rear end surfaces of the housing forming the heat generating chamber.

(2) In the viscous heater according to the second aspect, in the viscous heater according to the first aspect, the rotor has a flat plate shape having front and rear end faces whose radius from the axis of the drive shaft is longer than twice the shaft length. It is characterized by the following. In this viscous heater, the calorific value on the front and rear surfaces is larger than the calorific value on the outer peripheral surface.

(3) The viscous heater according to claim 3 is characterized in that, in the viscous heater according to claim 1 or 2, the front and rear wall surfaces of the heat generating chamber are flat. In this viscous heater, since the heat generating chamber is formed and the front and rear wall surfaces of the housing facing the front and rear end surfaces of the rotor are flat, the manufacture of the housing is easy and the manufacturing cost can be reduced. Further, since there is no labyrinth groove, even if an unavoidable accuracy error is allowed, the rotor does not interfere with the housing due to the inclination of the drive shaft.

(4) A viscous heater according to a fourth aspect is characterized in that, in the viscous heater according to the first, second or third aspect, the heat radiation chamber is formed on at least one of the front and rear sides of the rotor. In this viscous heater, the heat radiating chamber is formed on at least one of the front and rear sides of the rotor to effectively exchange heat.

(5) In the viscous heater according to the fifth aspect, in the viscous heater according to the first, second, third or fourth aspect, the housing forms one wall surface of the heat generating chamber at one end surface in the axial direction and at the other end surface. It is characterized by comprising a plate forming one wall surface of the heat radiating chamber and a remaining housing main body, wherein the plate and the housing main body are fastened with through bolts in a stacked state.

In this viscous heater, the plate and the housing body have simple shapes, and are easy to manufacture.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the invention described in each claim will be described below with reference to the drawings. In this viscous heater, as shown in FIG. 1, the front housing body 1, the front plate 2, the rear plate 3, and the rear housing body 4 are connected to the front housing body 1, the front plate 2, And between the rear plate 3 and the rear housing main body 4 via gaskets 5 and 6, which are fastened by a plurality of through bolts 7 in a stacked state. Here, the front housing body 1 and the front plate 2 constitute a front housing, and the rear plate 3 and the rear housing body 4 constitute a rear housing. A concave portion 2 a having a flat bottom surface formed on the rear end surface of the front plate 2 forms a heat generating chamber 8 held in a closed state together with the flat front end surface of the rear plate 3.

The inner surface of the front housing body 1 and the front end surface of the front plate 2 form a front water jacket FW as a front heat radiating chamber adjacent to the front of the heat generating chamber 8,
The rear end face of the rear plate 3 and the inner surface of the rear housing body 4 form a rear water jacket RW as a rear heat radiating chamber adjacent to the rear of the heat generating chamber 8. A water inlet port 9 and a water outlet port (not shown) are formed adjacent to an outer region of the rear surface of the rear housing body 4, and the water inlet port 9 and the water outlet port communicate with the rear water jacket RW. In the rear plate 3 and the front plate 2, water passages 10 as a plurality of fluid passages are provided at equal intervals between the through bolts 7, and the front water jacket FW and the rear water jacket RW are connected by the water passage 10. ing.

A shaft sealing device 12 is provided in the boss 2a of the front plate 2 adjacent to the heat generating chamber 8, and a bearing device 13 is provided in the boss 1a of the front housing body 1. A drive shaft 14 is rotatably supported via the shaft sealing device 12 and the bearing device 13, and the rear end of the drive shaft 14 has a length greater than the shaft length (preferably, 2 mm) as shown in FIG. A flat disk-shaped rotor 15 having front and rear end surfaces having a long radius from the axis of the drive shaft 14 is press-fitted, and this rotor 15 is rotatable in the heat generating chamber 8. And, in the gap between the wall surface of the heat generating chamber 8 and the outer surface of the rotor 15,
Silicon oil as a viscous fluid is interposed. A pulley (not shown) or an electromagnetic clutch (not shown) is provided at the tip of the drive shaft 14, and is rotated by a belt by an engine of the vehicle.

In this viscous heater incorporated in the heating device of the vehicle, when the drive shaft 14 is driven by an engine via a pulley or the like, the rotor 15 rotates in the heat generating chamber 8, so that the silicon oil is removed from the heat generating chamber. 8 wall and rotor 15
Heat is generated by shearing in the gap with the outer surface of the. This heat is sufficiently exchanged with the circulating water as the circulating fluid in the rear water jacket RW and the front water jacket FW,
The heated circulating water is used for heating the vehicle in the heating circuit.

At this time, if the viscosity coefficient is μ, the radius of the rotor 15 is R, the axial length of the rotor 15 is 1, the gap between the wall surface of the heat generating chamber 7 and the outer surface of the rotor 15 is δ, and the angular velocity is ω, The calorific value L _{1 on the} surface is L ₁ = πμω ² R ⁴ / δ, and the calorific value L _{2 on the} outer peripheral surface is L ₂ = 2πμω ² R ³ l / δ. Here, in this viscous heater, the axial length 2l <
If the radius is R, then L ₂ <L ₁ , and a large amount of heat L ₁ is secured on the front and rear end faces of the rotor 15. Then, the rear water jacket RW and the front water jacket FW are formed before and after the rotor 15 to effectively exchange heat.

Therefore, this viscous heater can be manufactured easily, can be manufactured at low cost, and can be used for effective heating while exhibiting excellent mountability to a vehicle or the like due to its short shaft length. . Note that the drive shaft 14 may be intermittently driven by using an electromagnetic clutch instead of the pulley.

Further, in order to improve the stirring action of the viscous fluid, the rotor 15 can be eccentrically pressed into the drive shaft.

[Brief description of the drawings]

FIG. 1 is a sectional view of a viscous heater according to an embodiment.

FIG. 2 is a plan view of a rotor and the like according to the viscous heater of the embodiment.

[Explanation of symbols]

8: Heat generation chamber FW: Front heat radiation chamber (front water jacket) RW: Rear heat radiation chamber (rear water jacket) 1, 2, 3, 4 ... Housing (1: front housing body, 2: front plate, 3) ... rear plate, 4 ... rear housing body) 13 ... bearing device 14 ... drive shaft 15 ... rotor 7 ... through bolt

Claims (5)

[Claims] A housing for forming a heat-generating chamber and a heat-radiating chamber adjacent to the heat-generating chamber for circulating a circulating fluid; a drive shaft rotatably supported by the housing via a bearing device; A viscous heater having a rotor rotatably provided by the drive shaft in the heat generating chamber, and a viscous fluid interposed in a gap between a wall surface of the heat generating chamber and an outer surface of the rotor and heated by the rotation of the rotor; 3. The viscous heater according to claim 1, wherein the rotor has a flat plate shape having front and rear end faces whose radius from the axis of the drive shaft is longer than the shaft length. 2. The viscous heater according to claim 1, wherein the rotor has a flat plate shape having front and rear end faces whose radius from the axis of the drive shaft is longer than twice the shaft length. 3. The viscous heater according to claim 1, wherein the front and rear wall surfaces of the heat generating chamber are flat. 4. The heat radiation chamber is formed on at least one of the front and rear sides of the rotor.
The described viscous heater. 5. The housing comprises a plate forming one wall surface of the heat generating chamber at one end surface in the axial direction, and a plate forming one wall surface of the heat radiation chamber at the other end surface, and a remaining housing body. The viscous heater according to claim 1, 2, 3, or 4, wherein the main bodies are fastened by through bolts in a stacked state.