JPS61261647A - Free piston type stirling engine - Google Patents

Abstract

PURPOSE:To utilize electric power for various sorts of controls by installing a power generation mechanism between a piston member which moves in reciprocation and the standstill part on the operating chamber side and taking out electric power separately, under driving a heat pump, etc. CONSTITUTION:The captioned apparatus 1 is equipped with an engine 2 and a heat pump 3 in the vertical direction, and the upper and lower displacers 6 and 7 are arranged in slidable ways in an engine operating chamber 4 and a heat-pump operating chamber 5, respectively. Further, in a center bounce chamber 36, a piston member 8 is arranged in slidable ways in the vertical direction. In the above, a power generation mechanism 25 consisting of a coil 26 and a magnet 27 is installed between the cylindrical part 23 of the piston member 8 and the receiving board 24 of a rod 11. The coil 26 is moved vertically in the recessed groove of the receiving board 14, accompanied with the vertical movement of the piston member 8, and an electromotive force is generated. Further, a lead wire 29 connected to the coil 26 is selectively connected to a power source 31 and a load 32 through a switch 30.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a free piston type Stirling engine, and particularly to a Stirling engine having a structure in which a heat pump, a compressor, etc. are driven by the output of the Stirling engine.

(Prior art and its problems) The Stirling engine is, for example, "Internal Combustion Engine" Vol. 13, 4.
No. (April 1974 issue), pages 56 to 69, this engine is well known, and it is also possible to apply this engine to a small heat pump system for heating and cooling.
It is publicly known as described in page 52 of RIGGERJ, published by Nihon Kogyo Shinbunsha, March 1984. As shown in FIG. 1, which shows an embodiment of the present invention, this engine has an engine 2 on the upper side in the figure, a heat pump 3 on the lower side, and an engine working chamber 4 in the upper side. An upper displacer 6 and a lower displacer 7 are slidably disposed in the heat pump operating chamber 5 on the lower side. And in the center part is a piston member 8
is arranged to be vertically movable, and the heat pump 3 can be driven by the output of the piston member 8.

By the way, in the above-mentioned Stirling engine, all the output from the engine 2 is used to drive the heat pump 3. For example, when performing air-conditioning operation using the above-mentioned engine, electric power for control etc. is used. Even if you need
There is a drawback that the above organizations cannot deal with it alone. In other words, a power source must be prepared separately from the engine, and various controls must be performed using the output from this power source.

This invention was made in order to solve the above-mentioned conventional drawbacks, and its purpose is to provide a Stirling engine that drives a heat pump, etc. with the Stirling engine as described above, in addition to driving the heat pump, etc. The object of the present invention is to provide a Stirling engine that can be taken out and is therefore convenient to use.

(Means for Solving the Problems) Therefore, in the free piston type Stirling engine of the present invention, as shown in FIG. Mechanism 2
5 is installed, and electric power is taken out from this power generation mechanism 25.

As shown in FIGS. 1 and 2, the power generating mechanism 25 described above may have a configuration in which a coil 26 is disposed on the piston member 8 side and a magnet 27 is disposed on the stationary part side, respectively. Alternatively, a configuration may be adopted in which a magnet is placed on the piston member 8 side and a coil is placed on the stationary part side. Further, in some cases, a mechanism in which both are coils may be adopted, and any mechanism that can output electrical energy by the relative movement of the piston member 8 with respect to the stationary part may be used.

(Function) As a result of the above, in the Stirling engine, while driving the heat pump as before, it is possible to extract electric power separately from this, and this can be used as electric power for controlling various parts. This makes it extremely convenient to use.

Further, since the power generation mechanism 25 provides an output corresponding to the stroke of the piston member 8, it becomes possible to monitor the stroke of the piston member 8 based on this output, and furthermore, based on this output, the piston member It is also possible to prevent the overstroke of 8.

Furthermore, in the case where one of the power generating mechanisms 25 is a coil 26 and the other is a magnet 27,
By energizing the coil 26 at the time of starting, it becomes possible to swing the piston member 8, and therefore it is also possible to use the power generating mechanism 25 as a starting device.

(Embodiments) Next, specific embodiments of the free piston type Stirling engine of the present invention will be described in detail with reference to the drawings.

In FIG. 1, 1 indicates the entire device, and this device 1 is a specific example of a free piston type Stirling engine, and has an engine 2 on the upper side in the figure and a heat pump 3 on the lower side. It shows. This device is formed of an engine working chamber 4, a heat pump working chamber 5, and a bounce chamber 36.
An upper displacer 6 and a lower displacer 7 are slidably disposed therein. Further, a piston member 8 is disposed in the center so as to be movable up and down, and an upper piston 9 and a lower piston 10 formed on this member 8 are respectively arranged in the respective chambers 4,5,36. The piston member 8 and each displacer 6.7 are guided at their center by a rod 11 extending in the vertical direction, and gas springs are provided between the upper and lower ends of the rod 11 and each displacer 6.7. 12 and 13 are formed respectively. Further, the rod 11 has a flange 14 extending radially outward at its axially central position, and this flange 14 is fixed to the casing 35. The piston member 8 has a structure in which the upper piston 9 and the lower piston 10 are connected by a connecting piece 15.15, and this connecting piece 15.15 connects to the transparent portion provided on the flange 14. It extends vertically through the hole 16.16.

The engine 2 has a heater 17 and a regenerator 18.
and a cooler 19, and the heat pump 3 has an acceptor 20. It has a regenerator 21 and a rejector 22.

Further, the piston member 8 has a cylindrical portion 23 connected to the lower part of the upper piston 9, and a magnet holder 24 is attached to the flange 14. A power generation mechanism 25 is interposed between the cylindrical portion 23 and the magnet pedestal 24. As shown in FIG. 2, the power generation mechanism 25 in this case is composed of an annular coil 26 attached to the cylindrical portion 23 and an annular magnet 27 attached to the magnet pedestal 24. An annular groove 28 is formed in the magnet pedestal 24, and a magnet 27 is attached to the circumferential surface thereof, and a magnetic field as shown by the broken line in FIG. 2 is formed in the pedestal 24. As the piston member 8 moves up and down, the coil 26 moves up and down within the groove 28, thereby generating an electromotive force. The lead wire 29 connected to the coil 26 is led out of the device 1 as shown in FIG. 1 and connected to a switch 30.

On the other hand, outside the device 1, a starting power source 31,
Both the load 32 and the load 32 are connected to the switch 30, and the switch 30 allows the voltage line 29 to be selectively connected to the starting power source 31 and the load 32. Further, a stroke monitoring device 33 is connected in parallel to the load 32, and an overstroke prevention device 34 is further connected to this stroke monitoring device 33. Note that this overstroke prevention device 34 is constituted by a load such as resistance.

Next, the operating state of the above device will be explained. First, when starting the device, the starting power source 31 is connected to the coil 26 by the switch 30.

Then, an alternating current will flow through the coil 26, and due to the relationship between this current and the magnetic field formed in the magnet pedestal 24, a force will act on the piston member 8 to cause it to swing. do. This force gradually increases the amplitude of the piston member 8, making it possible to start the device.

On the other hand, while the above device is in operation, the switch 30 is switched to connect the coil 26 to the load 32.

In other words, the coil 26 is connected to the concave groove 28 of the magnet holder 24.
By reciprocating up and down within the coil 26, an alternating current electromotive force is generated in the coil 26, and the load 32 is actuated by this electromotive force.

What should be particularly noted here is that the output from the coil 26 is introduced into the stroke monitoring device 33. That is, since the piston member 8 reciprocates at a constant frequency, when the stroke of the reciprocating movement of the piston member 8 becomes large, the reciprocating speed increases accordingly, and the alternating current output from the coil 26 increases. Since the voltage is also large, the stroke of the piston member 8 can be monitored by monitoring this voltage. Then, the stroke of the piston member 8 exceeds a predetermined value,
When the output voltage from the coil 26 exceeds a reference value, the overstroke prevention device 34 is activated. That is, in addition to the load 32, another load such as a resistor is connected,
By increasing the load on the engine 2, the stroke of the piston member 8 is reduced to an appropriate amount. Note that such stroke adjustment is also possible by adjusting the heating temperature of the heater 17, but stroke control by adjusting the heating temperature has poor responsiveness, and adjustment using the above method is superior in terms of responsiveness. .

In the above embodiment, the coil 26 is attached to the piston member 8 side, and the magnet 27 is attached to the casing 35 side, but it is also possible to reverse these arrangements, and it is also possible to implement self-excited power generation. It is also possible to adopt a structure in which both are coils, such as a motor or a separately excited generator. In addition, although the above example shows an example in which the output from the engine 2 is used as a drive source for the heat pump 3, it can be implemented in exactly the same manner as above in an engine that uses the output from the engine 2 for other purposes such as a compressor. It is.

(Effects of the Invention) In the free piston type Stirling engine of the present invention, since a power generation mechanism is interposed between the reciprocating piston member and the stationary part on the working chamber side, it drives a heat pump etc. as in the conventional case. However, separately from this, electricity is taken out,
This is extremely convenient since it can be used as power for various controls. In addition, since the power generating mechanism generates an output corresponding to the stroke of the piston member, it is possible to monitor the stroke of the piston member using this output.
Furthermore, it is also possible to prevent overstroke of the piston member based on the above monitoring results.

Further, when a coil and a magnet are used together as the power generating mechanism, it is possible to swing the piston member and start the engine by energizing the coil at the time of starting.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an example of a free piston type Stirling engine of the present invention, and FIG. 2 is an explanatory diagram of an example of the power generation mechanism used in the above. 1... Stirling engine, 2... engine, 3...
・Heat pump, 4.5... Working chamber, 8... Piston member, 25... Power generation mechanism, 26... Coil, 27
···magnet. 1 1st close

Claims (1)

[Claims] 1. In a free piston type Stirling engine that has a displacer and a piston member that are arranged in a working chamber so as to be able to freely reciprocate, and further has a driven part such as a heat pump that is driven by the output of the piston member, the above-mentioned engine that reciprocates. A free piston type Stirling engine characterized in that a power generation mechanism is interposed between a part of a piston member and a stationary part.