JPH06264817A - Stirling engine and start controlling method thereof - Google Patents

Abstract

PURPOSE:To secure the quality of a heater pipe and assure a start by controlling the combustion quantity of a combustor for heating when the heater pipe transferring heat to a heat exchanger head section is heated to the prescribed temperature. CONSTITUTION:When a combustor 3 is ignited and an engine is kept in the cold state at the time of a start of a Stirling engine, a heater pipe 2 is heated by the first combustion quantity. When the temperature of the heater pipe 2 detected by a temperature detector 5 becomes a specific temperature, the combustion quantity is reduced by a specific quantity to heat the heater pipe 2. The same heating method is repeated while whether the temperature of a heat exchanger head section high-temperature side surface 1a detected by another temperature detector 6 reaches the start set temperature or not is judged. When this temperature reaches the set temperature, the operation of a starter 4 is activated. The quality of the heater pipe 2 is secured, and a sure start can be efficiently made.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Stirling engine used as a prime mover of, for example, an air conditioner (hereinafter abbreviated as an air conditioner), and more particularly to improvement of a starting control method thereof.

[0002]

2. Description of the Related Art FIG. 8 is a schematic structural view showing a structure of a conventional Stirling engine, and FIG. 9 is a control flow chart showing a starting control method of the conventional Stirling engine in FIG. In FIG. 8, reference numeral 1 denotes a heat exchange head section for obtaining a driving force by changing the volume of each working gas (not shown) which is divided into a high temperature side and a low temperature side in the container and enclosed by a heat exchange means (not shown), Reference numeral 2 is a heater tube which is connected to the high temperature side of the container of the heat exchange head portion 1 and is arranged so as to project from the surface of the container. 3 is burned by ignition and heats the high temperature side of the heat exchange head portion 1 via the heater tube 2. A combustor 4 for starting, 5 a temperature detector for detecting the surface temperature of the heater tube 2, 6 a temperature detector for detecting the temperature of the high temperature side surface 1a of the container of the heat exchange head part Is. In the symbol of FIG. 9, T _c is a temperature detected by the temperature detector 6, T _c ^* is a control set temperature set by the temperature condition of the engine, Q ^* is a predetermined combustion amount, and _Th is a temperature detector 5. , T _hc ^* is a heater tube temperature control predetermined temperature when the Stirling engine (hereinafter referred to as engine) is started from a cold state, and T _hh ^* is a heater tube control predetermined temperature when the engine is started from a warm state. These T _hc
^* , T _hh ^* are determined from the heat resistant temperature of the heater tube. N _E is a detected rotation speed of an engine rotation speed detector (not shown), N _E ^* is a control predetermined rotation speed of N _E , and N _EO ^* is an engine abnormal lower limit rotation speed.

Next, the operation will be described. Ignition is performed by the combustor 3, and then the detected temperature T _c of the temperature detector 6 and its control setting for determining whether the engine is in a cold state such as long-term stop or in a warm state such as temporary stop. Comparison judgment with temperature (discrimination value of cold or warm state) T _c ^* (H ₁ )
I do. If T _c <T _c ^* (cold state), heating is performed with a predetermined combustion amount Q ^* while performing a comparative determination (H ₃ ) until the heater tube temperature _Th reaches the control predetermined temperature T _hc ^* . On the other hand, T _c
If ≧ T _c ^* (warm state), heating is performed with a predetermined combustion amount Q ^* while making a comparative judgment (H ₃ ) until the heater tube temperature T _h reaches the control predetermined temperature T _hh ^*. When the respective conditions are satisfied, the starter 4 starts to operate, and when the engine speed N _E is compared and judged (H ₄ ) with the control predetermined speed N _E ^* , the engine finally holds it. Operate with driving force (hereinafter referred to as independent operation). If the engine speed does not reach the predetermined speed N _E ^* , the speed N _E is compared with the abnormal lower limit speed N _EO ^* (H ₅ ), and if it is higher than N _EO ^* , the engine is restarted with the starter. However, if N _EO ^* or less, it is an abnormal stop.

[0004]

Since the conventional start control method for the Stirling engine is performed by the above-described flow, for example, in the case of starting from a cold state, the heat that controls the engine driving force depending on the outside air temperature condition is used. The temperature of the exchange head (strictly speaking, the internal working gas temperature) is different (because the heat exchange head is heated only by the heat conduction from the heater pipe), and the startability varies due to the large and small starting load. There was a problem such as doing. There is also a method of raising the heater tube control predetermined temperature in order to avoid start-up congestion, but there is a limit in terms of the heat resistant temperature of the heater tube.

The present invention has been made to solve the above problems, and in particular, a Stirling engine capable of ensuring the quality of a heater tube heated even when the engine is started from a cold state and performing a reliable start. It is intended to obtain a starting control method of

[0006]

According to a first aspect of the present invention, there is provided a startling control method for a Stirling engine in which a volume of each working gas, which is divided into a high temperature side and a low temperature side in a container and enclosed, is changed by a heat exchange means. A heat exchange head section that obtains a driving force, a heater tube that communicates with the high temperature side and is arranged so as to project from the container surface, a combustor that combusts by ignition and heats the heater tube, and a high temperature side of the heater tube and the container. A Stirling engine that is equipped with a temperature detector that detects the surface temperature of each and a starter that is driven to start the driving force.The surface temperature of the heater tube rises to a predetermined temperature after the ignition of the combustor. Then, while controlling the combustion amount of the combustor so that the surface temperature of the heater tube does not exceed a predetermined temperature, the starter is operated by heating until the surface temperature of the high temperature side of the container reaches the set temperature. .

According to a second aspect of the present invention, there is provided a starting control method for a Stirling engine, wherein a volume of each working gas, which is divided into a high temperature side and a low temperature side in a container and enclosed, is changed by a heat exchange means to obtain a driving force. The heat exchange head part, the heater tube which is connected to the high temperature side and is arranged so as to project from the surface of the container, the combustor which burns by ignition and heats the heater tube, and the heater tube and the high temperature side of the container which are mounted respectively. A Stirling engine including a temperature detector that detects a surface temperature and a starter that is operated to start a driving force.When the surface temperature of a heater tube rises to a predetermined temperature after ignition of a combustor, the starter is set to a predetermined value. The pre-operation is performed only for a time, the heating of the heater tube and the pre-operation are repeated until the high temperature side surface temperature reaches the set temperature, and then the starter is normally operated.

Further, according to a third aspect of the present invention, there is provided a starting control method for a Stirling engine in which a heat exchanging means is used to change the volume of each working gas which is divided into a high temperature side and a low temperature side and is enclosed by a heat exchanging means. The crossing head portion, the heater tube which is communicated with the high temperature side and is arranged so as to project from the container surface, the combustor which burns by ignition to heat the heater tube, and the respective surfaces which are mounted on the high temperature side of the heater tube and the container. A Stirling engine composed of a temperature detector that detects the temperature and a starter that is operated to start the driving force.When the surface temperature of the heater tube rises to a predetermined temperature after ignition of the combustor, the starter is operated at low speed. Preheat and control the amount of combustion in the combustor so that the surface temperature of the heater tube does not exceed the specified temperature. Is obtained so as to drive the motor.

A Stirling engine starting control method according to a fourth aspect of the present invention is the first, second or third aspect.
In the Stirling engine starting control method, the set temperature of the high temperature side surface of the container is calculated and set corresponding to the load when the engine is started.

Further, according to a fifth aspect of the present invention, in the Stirling engine, the heat exchange head portion for obtaining a driving force by changing the volume of each working gas which is partitioned into the high temperature side and the low temperature side in the container and enclosed by the heat exchange means. And a heater tube that communicates with the high temperature side and is arranged to project from the surface of the container, a combustor that combusts by ignition and heats the heater tube, and a heater tube and the high temperature side of the container that detect the surface temperature of each In a Stirling engine composed of a temperature detector and a starter operated for starting the driving force, a heating heater is attached to the high temperature side surface of the container.

[0011]

According to the start control method of the Stirling engine in claim 1 of the present invention, when the heater tube which conducts heat to the heat exchange head portion rises to a predetermined temperature, the heating amount of the combustor is controlled to heat the heater tube. Warm the heat exchanger head to the set temperature (engine temperature) in a safe state where the pipe does not overheat.

Further, in the start control method of the Stirling engine according to the second and third aspects of the present invention, by preliminarily operating the starter, the starter is circulated between the working gas heater tube in the heat exchange head part and the high temperature side of the container to conduct heat. Improve.

In the Stirling engine starting control method according to the fourth aspect of the present invention, since the set temperature (engine temperature state) is sequentially calculated and set corresponding to the load, the heater tube heating time and the like are rational. become.

In the Stirling engine according to the fifth aspect of the present invention, the heating heater heats the high temperature side of the heat exchange head portion container, so that the high temperature side of the heat exchange head portion reaches the set temperature (engine temperature state). Be warmed.

[0015]

【Example】

Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is a control flow chart showing a start control method of a Stirling engine according to a first embodiment of the present invention. The structure of the Stirling engine is the same as that of FIG. In the symbols in the figure, Q ₁ ^* is the first control predetermined combustion amount after ignition in the combustor 3, Q _j ^* is the predetermined combustion amount that is changed and set in the case of repeated heating, and Q _{j + 1} ^* is the repetition 2 Controlled combustion amount after the first time,
ΔQ is the amount of change in the amount of combustion after the second time, and T _h ^* is the control predetermined temperature of the heater tube temperature T _h . Note ΔQ may be set in association with such degree of difference between the heater pipe temperature T _h and control the predetermined temperature T _h ^*. Other symbols are the same as the conventional ones, and the description is omitted.

Next, the operation will be described. Ignition is performed in the combustor 3 and then it is determined whether the engine is cold or hot (H ₁ ). If it is in the cold state (T _c <T _c ^* ), the heater tube 2 is first heated with the combustion amount of Q ₁ ^{* and} the combustion amount is changed when the heater tube temperature _Th becomes the predetermined temperature T _h ^*. The heater tube 2 is heated by lowering it by ΔQ. It is judged (H ₂ ) whether or not the heat exchanger head high temperature side surface temperature T _c has reached its start set temperature (cold, temperature state determination value) T _c ^* , and if it has not reached it, the above-mentioned repetition is repeated. Therefore, T _c ≧ T _c ^* (temperature state)
If the above condition is satisfied, the control flow is the same as in the case of the conventional temperature state, and the operation of the starter 4 and the independent operation of the engine are reached.

Example 2. The second embodiment of the present invention will be described below with reference to the drawings. 2 is a control flow chart showing a start control method of a Stirling engine according to a second embodiment of the present invention, and the structure of the Stirling engine is the same as that of FIG. In the symbols in the figure, τ is the pre-operation time of the starter 4, τ ^* is the control predetermined time, and the other symbols are the same as those in the first embodiment, and the description thereof is omitted.

Next, the operation will be described. Ignition is performed in the combustor 3, and then it is determined whether the engine is cold or hot (H ₁ ). If it is in a cold state (T _c <T _c ^* ), the heater tube 2 is heated with a predetermined combustion amount Q ^* and the heater tube temperature _{Th is set.}
When the temperature reaches the predetermined temperature T _h ^* , the starter 4 starts the preliminary operation. When the operating time τ of the starter 4 reaches the predetermined time τ ^* , it is determined whether the heat exchanger head high temperature side surface temperature _Tc has reached its set temperature (cold, temperature state determination value) _Tc ^*. (H ₁ ), and if not reached, the heater tube heating and the starter preliminary operation are repeated. When T _c ≧ T _c ^* (warm state) is satisfied in this way, the control flow is the same as in the conventional warm state, and the operation of the starter 4 and the self-sustained operation of the engine are reached.

Example 3. The third embodiment of the present invention will be described below with reference to the drawings. 3 is a control flow chart showing a start control method of a Stirling engine according to a third embodiment of the present invention, and the structure of the Stirling engine is the same as that of FIG. In the figure, the symbol ΔT _h represents the allowable temperature difference between the heater tube temperature T _h and the control predetermined temperature T _h ^*, and the other symbols are the same as those in the first embodiment, and the description thereof is omitted.

Next, the operation will be described. Ignition is performed in the combustor 3, and then it is determined whether the engine is cold or hot (H ₁ ). If it is cold (T _c <T _c ^* ),
First, the heater tube 2 is heated with the combustion amount of Q ₁ ^* , and when the heater tube temperature T _h reaches or exceeds the predetermined temperature T _h ^* , the starter 4
Start low-speed pre-driving. Since the heater tube temperature T _h changes due to this preliminary operation, it is judged (H ₇ ) that the amount of difference from the predetermined temperature T _h ^* is less than ΔT _h, and the combustion amount Q
_While increasing / decreasing _j ^* by ΔQ, it is determined whether or not the heat exchanger head high temperature side surface temperature T _c has reached the set temperature T _c ^* . If this has not been reached, the heating of the heater tube 2 and the low speed preliminary operation of the starter 4 are continued. In this way T
_{If c} ≧ T _c ^* (warm state) is satisfied, the control flow is the same as in the conventional warm state, and engine self-sustaining operation is reached.

Example 4. Embodiment 4 of the present invention will be described below with reference to the drawings. 4 is a refrigerant system diagram when the Stirling engine is applied as a prime mover for an air conditioner, and FIG. 5 is a start control flow diagram of the Stirling engine of the refrigerant system in FIG. In the figure, 8 is a refrigerant compressor, 9 is a condenser, 10 is an expansion valve, 11 is an evaporator, 12 is a solenoid valve for balancing high and low before starting, and 13 is a condenser 9
Is a check valve for preventing the transfer of the refrigerant from the refrigerant compressor 8 to the refrigerant compressor 8, 14 is a low pressure detector, and 7 is a device for calculating the heat exchange head portion set temperature. The rest is the same as the conventional one, and the description thereof is omitted.

Next, the operation will be described. First, the solenoid valve 12 is opened in response to the signal of the air conditioner ON, and the high and low pressures of the refrigeration cycle are balanced. Then, the heat exchange head set temperature T _c ^* is calculated and set based on the low pressure LP. After that, the self-sustaining operation of the engine is finally reached by the same procedure as in the first embodiment shown in FIG. The procedure after the setting of the set temperature T _c ^* may be the second embodiment shown in FIG. 2 or the third embodiment shown in FIG.

Example 5. The sixth embodiment of the present invention will be described below with reference to the drawings. FIG. 6 is a schematic structural diagram showing the structure of a Stirling engine according to a fifth embodiment of the present invention. In the figure, reference numeral 15 is a heat exchanger head portion, which is a heating heater mounted on the high temperature side surface 1a of the container, and is otherwise similar to FIG.

Next, the operation will be described. The heater 15 for heating heats the surface 1a by heating to heat the working gas on the high temperature side, and can heat the heat exchange head portion to the engine temperature state efficiently in addition to the heating by the combustor. An example of the start control method of the Stirling engine in this configuration will be described with reference to the start control flow chart of FIG. 7. First, it is determined whether the engine is in a cold state or a warm state (H ₁ ). If it is in a cold state, the heater 15 is energized to heat the heat exchange head portion 1 to create a warm state. After reaching the temperature state, the combustor 3 is ignited, the heater tube 2 is heated, and the starter operation is performed to reach the engine independent operation.

[0025]

As described above, according to the first aspect of the present invention, the heat exchange for obtaining the driving force by changing the volume of each working gas, which is divided into the high temperature side and the low temperature side in the container and enclosed, by the heat exchange means. The head part, the heater tube which is in communication with the high temperature side and is arranged so as to project from the container surface, the combustor which burns by ignition to heat the heater tube, and the heater tube and the surface mounted on the high temperature side of the container. A Stirling engine composed of a temperature detector for detecting a temperature and a starter operated for starting a driving force, wherein the surface of the heater tube is raised when the surface temperature of the heater tube rises to a predetermined temperature after ignition of the combustor. While controlling the combustion amount of the combustor so that the temperature does not exceed a predetermined temperature, the starter is operated by heating until the surface temperature on the high temperature side of the container reaches the set temperature, and according to claim 2, after ignition of the combustor. Table of heater tubes Temperature so as to normally operate the repeated thereafter starter until reaching the heating and preliminary operation of only preliminary operation to and a heater tube for a predetermined time starter Once raised to a predetermined temperature to the high temperature side surface temperature set temperature, claim 3
According to the report, when the surface temperature of the heater tube rises to a predetermined temperature after ignition of the combustor, the starter is preliminarily operated at a low speed and the combustion amount of the container is controlled while controlling the combustion amount of the combustor so that the surface temperature of the heater tube does not exceed the predetermined temperature. Since the heating is performed until the high temperature side surface temperature reaches the set temperature and then the starter is operated, there is an effect that a starting control method of the Stirling engine can be obtained in which the quality of the heater tube is ensured and reliable starting can be performed efficiently.

Further, claim 1 or claim 2 or claim 3
Since the set temperature of the high temperature side surface of the container is calculated and set sequentially corresponding to the load at the time of engine start, in the start control method of No. 3, the start control method of the Stirling engine that is optimal for the load and can be started reliably and efficiently There is an effect that can be obtained.

Further, since the heater for heating is mounted on the high temperature side surface of the container in the heat exchange head portion, there is an effect that a Stirling engine capable of efficiently heating the heat exchange head portion can be obtained.

[Brief description of drawings]

FIG. 1 is a control flow chart showing a start control method for a Stirling engine according to a first embodiment of the present invention.

FIG. 2 is a control flow chart showing a start control method for a Stirling engine according to a second embodiment of the present invention.

FIG. 3 is a control flow chart showing a start control method for a Stirling engine according to a third embodiment of the present invention.

FIG. 4 is a refrigerant system diagram when a Stirling engine according to a fourth embodiment of the present invention is applied to a prime mover for an air conditioner.

FIG. 5 is a control flow chart showing a starting control method according to a fourth embodiment.

FIG. 6 is a schematic structural diagram showing a configuration of a Stirling engine according to a fifth embodiment of the present invention.

FIG. 7 is a control flow chart showing a starting control method according to a fifth embodiment.

FIG. 8 is a schematic structural diagram showing a configuration of a conventional Stirling engine.

FIG. 9 is a control flow diagram showing a conventional start control method for a Stirling engine.

[Explanation of symbols]

1 Heat Exchange Head 1a Heat Exchange Head High Temperature Surface of Container 2 Heater Tube 3 Combustor 4 Starter 5 Heater Tube Surface Temperature Detector 6 Heat Exchange Head High Temperature Side Surface Temperature Detector 7 Heat Exchange Head (Control) Set Temperature Calculation device 15 Heater T _c Heat exchange head part high temperature side surface temperature T _c ^* Heat exchange head part high temperature side surface (control) set temperature T _h Heater pipe temperature T _h ^* Heater pipe (control) predetermined temperature Q ^* (control) predetermined Combustion amount Q _j ^* (Control) Predetermined combustion amount τ ^* Starter preliminary operation (control) Predetermined time τ Starter preliminary operation time

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Susumu Kumata 6-14 Maruo-cho, Nagasaki City Mitsubishi Electric Corporation Nagasaki Works

Claims (5)

[Claims] 1. A heat exchange head section for obtaining a driving force by changing the volume of each working gas, which is divided into a high temperature side and a low temperature side and sealed in a container, by a heat exchange means, and a heat exchange head portion which communicates with the high temperature side and from the surface of the container. A heater tube provided in a projecting manner, a combustor for burning the heater tube by burning it to ignite, a temperature detector mounted on the high temperature side of the heater tube and the container for detecting respective surface temperatures, A Stirling engine configured with a starter operated for starting driving force, wherein the surface temperature of the heater tube rises to a predetermined temperature when the surface temperature of the heater tube rises to a predetermined temperature after ignition of the combustor. While controlling the combustion amount of the combustor so as not to exceed, it is heated until the high temperature side surface temperature of the container reaches a set temperature, and the starter is operated. Engine start control method. 2. A heat exchange head section for obtaining a driving force by changing the volume of each working gas, which is divided into a high temperature side and a low temperature side and sealed in a container, by a heat exchange means, and from the surface of the container communicating with the high temperature side. A heater tube provided in a projecting manner, a combustor for burning the heater tube by burning it to ignite, a temperature detector mounted on the high temperature side of the heater tube and the container for detecting respective surface temperatures, A Stirling engine configured with a starter operated for starting driving force, wherein after the surface temperature of the heater tube rises to a predetermined temperature after ignition of the combustor, the starter is preliminarily operated for a predetermined time and The Stirling engine is characterized in that the heating of the heater tube and the preliminary operation are repeated until the surface temperature on the high temperature side reaches a set temperature, and then the starter is normally operated. Start control method. 3. A heat exchange head section for obtaining a driving force by changing the volume of each working gas enclosed and divided into a high temperature side and a low temperature side in a container by a heat exchange means, and from the surface of the container communicating with the high temperature side. A heater tube provided in a projecting manner, a combustor for burning the heater tube by burning it to ignite, a temperature detector mounted on the high temperature side of the heater tube and the container for detecting respective surface temperatures, A Stirling engine configured with a starter operated for starting a driving force, wherein after the surface temperature of the heater tube rises to a predetermined temperature after ignition of the combustor, the starter is preliminarily operated at a low speed and the heater is While controlling the combustion amount of the combustor so that the surface temperature of the tube does not exceed the predetermined temperature, heat until the high temperature side surface temperature of the container reaches a set temperature, and then start the starter. A starting control method for a Stirling engine, which is characterized by being driven. 4. The set temperature of the surface on the high temperature side of the container is calculated and set corresponding to the load at the time of starting the engine in order, and the set temperature is set. Start control method for Stirling engine. 5. A heat exchange head part for obtaining a driving force by changing the volume of each working gas enclosed and divided into a high temperature side and a low temperature side in a container by a heat exchange means, and a container communicating with the high temperature side from the container surface. A heater tube provided in a projecting manner, a combustor for burning the heater tube by burning it to ignite, a temperature detector mounted on the high temperature side of the heater tube and the container for detecting respective surface temperatures, A Stirling engine configured with a starter driven for starting a driving force, wherein a heating heater is mounted on a high temperature side surface of the container.