Refrigeration – Gas compression – heat regeneration and expansion – e.g.,...
Patent
1994-08-25
1995-10-31
Kilner, Christopher
Refrigeration
Gas compression, heat regeneration and expansion, e.g.,...
60520, F25B 900
Patent
active
054618690
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a vuilleumier heat pump device and particularly relates to a countermeasure for controlling driving power of the vuilleumier heat pump device.
BACKGROUND ART
In general, a vuilleumier heat pump device used in such as an air conditioner comprises a hot-side heat pump and a cold-side heat pump, as disclosed in Japanese Patent Application laying Open Gazette No. 1-187164. In the vuilleumier heat pump device, each of the heat pumps is so composed that a displacer is housed in a cylinder. Both the displacers of the hot-side and cold-side heat pumps are connected to each other so as to reciprocate at a set phase angle (e.g., 90.degree.). A hot space and a middle-temperature space in the hot side cylinder are communicated with each other through a hot side passage, while a cold space and a middle-temperature space in the cold side cylinder are communicated with each other through a cold side passage.
Reciprocations of both the displacers change volumes of respective spaces above-mentioned in the cylinders, so that a working gas is changed in pressure to form a thermodynamic cycle. Heat input is conducted at a heater and a cooler on the hot side and cold side passages, while heat radiation is conducted at middle-temperature heat exchangers on both the passages. Further, in the hot-side heat pump, heat is stored in a regenerator on the hot side passage when a working gas moves from the hot space to the middle-temperature space, while heat stored in the regenerator is regenerated when a working gas moves from the middle-temperature space to the hot space. In the cold-side heat pump, heat is stored in a regenerator on the cold side passage when a working gas moves from the middle-temperature space to the cold space, while heat stored in the regenerator is regenerated when a working gas moves from the cold space to the middle-temperate space.
In the above-mentioned vuilleumier heat pump device, a rod of one displacer is connected to a rod of another displacer via a connection mechanism. A crank shaft of the connection mechanism is connected to an auxiliary driving motor as an auxiliary driving power source. The auxiliary driving motor enables the displacers to reciprocate. That is, when a rotation speed of the crank shaft increases over its self operating point, the auxiliary driving motor gives auxiliary driving power to the crank shaft. On the contrary, when the rotation speed of the crank shaft decreases below its self operating point, the auxiliary driving motor gives a reverse load to the crank shaft.
In detail, as shown in FIG. 4, a shaft power (shaft work) Wt of the crank shaft increases linearly as the rotation speed N of the crank shaft increases. In contrast to this, a power loss L which is the sum of a mechanical loss and a flow loss increases in a curve as the rotation speed N of the crank shaft increases. Both the variation characteristics of the shaft power Wt and the power loss L are intersected at a set rotation speed N. The point of intersection is the self operating point S.
At the self operating point S, the shaft power Wt is balanced with the power loss L so that power supply to the auxiliary driving motor is interrupted. When the rotation speed N increases over the self operating point S, the power loss L exceeds the shaft power Wt so that the auxiliary driving power is required (See A1 in FIG. 4). As a result, the auxiliary driving motor is activated.
On the contrary, when the rotation speed N decreases below the self operating point S, the power loss L is below the shaft power Wt so that a reverse load is required (See A2 in FIG. 4). As a result, the auxiliary driving motor is reduced in speed.
There is known a conventional vuilleumier heat pump device in which the crank shaft as above-mentioned is connected to a motor and a brake, as disclosed in Japanese Patent Application Laying Open Gazette No. 2-4174. In this prior art, a required rotation speed of the crank shaft which corresponds to a required load is calculated, e.g., during a cooling operati
REFERENCES:
patent: 3802211 (1974-04-01), Bamberg et al.
patent: 4642988 (1987-02-01), Benson
patent: 5406801 (1995-04-01), Inoue et al.
Ishino Tsutomu
Kitamoto Masahiro
Daikin Industries Ltd.
Ferguson Jr. Gerald J.
Kilner Christopher
LandOfFree
Vuilleumier heat pump device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Vuilleumier heat pump device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vuilleumier heat pump device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1765321