JPH06178874A - Tender type model steam lcomotive - Google Patents

Abstract

PURPOSE:To minimize a size small enough for driving in a space of a scale of a private garden and to ensure a safe driving. CONSTITUTION:An air supply duct 3 is provided through a tender water tank 2-1 in an L-shaped cross section from an upper part of the tank 2-1, and a duct diffuser 3-1 of the air supply duct 3 is positioned opposingly to an air supply port 1-11 to a combustion chamber 1-1. A water level sensor 3F is provided to detect a lowering of a boiler water level from a prescribed level. If a lowering of the boiler water level is detected, in order to retain the boiler water level at the prescribed level, a water supply pump 2G is driven to supply supplemental water which is accumulated in the tender water tank 2-1 to a boiler chamber 1-2. Further, a curved path sensor 2E is provided to detect a proceeding into the curved path. If a proceeding into the curved path is detected, a set speed to be kept is reduced by a prescribed amount to reduce a travelling speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tender type model steam locomotive driven by steam pressure generated by burning solid fuel such as charcoal and coal.

[0002]

2. Description of the Related Art Conventionally, as a tender model steam locomotive of this type, a large-sized one for a driver to enjoy by pulling a passenger car or a passenger car is enjoyed for train formation operation or locomotive independent operation. There are various types of tender model steam locomotives, even those of relatively small size. These are realized by an external combustion engine that imitates the same principle and structure as a real steam locomotive. That is, solid fuel such as charcoal or quartz is burned in the combustion chamber to boil water in the boiler chamber, and the steam obtained thereby drives the steam engine. In the tender model steam locomotive, a steam locomotive equipped with a steam engine is connected to a tender car that stores makeup water to the boiler chamber. Water is supplied from the tender car to the boiler room by a manual pump. That is, in order to stably supply the steam to the steam engine, it is essential to maintain the water level in the boiler room, and the water supply operation is performed by the manual pump while monitoring the water level gauge during traveling. In addition, in order to assist combustion until the fuel reaches a sufficient thermal power in the combustion chamber at the start of operation and to quickly recover the thermal power that drops when refueling, warm air is supplied to the air supply port to the combustion chamber. Is supposed to be sent.

[0003]

However, there is no conventional tender model steam locomotive that can be enjoyed easily and safely by laying a track in a general private garden.
The reason for this is firstly that it is difficult to reduce the size. That is, (a) If the size is reduced, the combustion chamber becomes narrower, and it becomes difficult to maintain stable combustion. In order to stabilize the combustion, a large amount of warm air should be frequently sent to the air supply port of the combustion chamber, but the tender tank of the tender car that stores make-up water is close to the air supply port of the combustion chamber and faces it. Since it is located, this tender water tank interferes and cannot send a large amount of warm air easily. It should be noted that it is possible to disconnect the tender vehicle or to omit a part of the structure of the driver's cab each time in order to supply the warm air, but it takes considerable effort. Due to such difficulties, most of the small model steam locomotives use easy liquid fuels such as alcohol. (B) The smaller the size, the more difficult it becomes to supply water from the tender vehicle to the boiler chamber with a manual pump, and it becomes impossible to stably supply steam to the steam engine. Secondly, as a reason for the above, even if there is a risk of derailment in a curved track portion on a downhill and miniaturization can be achieved, safety is not sufficiently ensured. That is, since the steam engine is used, when the track gradient is uphill, a heavy load is applied and the traveling speed is reduced. On the other hand, in the case of a downhill, the load becomes light and the traveling speed increases. In particular, in the case of an endless rail on a undulating garden track, there are many conditions where the curved track part is downhill, and there is a risk of acceleration and derailment in this section, and safety is not sufficiently ensured.

[0004]

The present invention has been made to solve such a problem, and the first invention (the invention according to claim 1) of the invention is that a tender water tank has a substantially L-shaped cross section from its upper portion. An air supply duct is provided so as to penetrate through the shape, and the air outlet of the air supply duct is located opposite to the air supply port to the combustion chamber of the steam locomotive. Further, in the second invention (the invention according to claim 2), the decrease in the water level with respect to the fixed position in the boiler chamber is detected by the water level decrease detecting means, and the water supply pump is determined based on the detection result by the water level decrease detecting means. Drive,
In order to maintain the water level in the boiler room at a fixed position, the make-up water stored in the tender tank is supplied to the boiler room. In the third invention (the invention according to claim 3), the traveling speed is detected by the speed detecting means, and the opening / closing time of the steam valve is set so that the traveling speed detected by the speed detecting means is maintained at the set speed. While controlling, on the other hand, the curved road detecting means detects the entry into the curved road, and the set speed is lowered by a predetermined amount based on the detection result of the curved road detecting means. The fourth invention (the invention according to claim 4) is a combination of the respective means of the first, second, and third inventions.

[0005]

Therefore, according to the first aspect of the present invention, when hot air is blown from the upper portion of the tender water tank, the cross section is substantially L.
Hot air is supplied to the combustion chamber through the air supply duct that passes through the letter-like shape and from the air outlet of the air supply duct. Also,
In the second aspect of the invention, when the water level in the boiler chamber is lower than the fixed position, the water supply pump is driven, the makeup water stored in the tender water tank is supplied to the boiler chamber, and the water level in the boiler chamber is moved to the fixed position. Maintained automatically. Further, in the third aspect of the invention, when the curved road detecting means detects the entry into the curved road, the set speed is reduced by a predetermined amount, and the opening / closing time of the steam valve is increased in order to maintain the traveling speed at the lowered set speed. Controlled. In the fourth invention, the operations of the first, second, and third inventions are combined.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The tender model steam locomotive according to the present invention will be described in detail below.

FIG. 1 is a basic block diagram showing an embodiment of this tender model steam locomotive. In the figure, 1 is a steam locomotive and 2 is a tender car. The steam locomotive 1 includes a combustion chamber 1-1, a boiler chamber 1-2, a steam valve 2D, and a curved road sensor 2
E is equipped. A boiler water level detection sensor 2F is arranged in the boiler chamber 1-2. The tender vehicle 2 includes a tender water tank 2-1, an operation control unit 2B, a speed sensor TG, a water supply pump 2G, a power control battery E1 (two AA dry batteries),
It has a speed reference battery E2 (two AA batteries).
A tender water level sensor 2H is arranged in the tender water tank 2-1. A water supply pump motor WP is connected to the water supply pump 2G via a speed reducer 10-2.

FIG. 3A is a partially cutaway plan view of the tender wheel 2, and FIG. 3B is a partially broken side view of the tender wheel 2. In this embodiment, an air supply duct 3 is provided on the steam locomotive 1 side of the tender water tank 2-1 from the upper part thereof in a substantially L-shaped cross section, and the duct air outlet 3 of the air supply duct 3 is provided.
1 is located opposite to the air supply port 1-11 to the combustion chamber 1-1 of the steam locomotive 1.

As a result, when hot air is blown from the duct opening 3-2 by a hair dryer or the like, it passes through the air supply duct 3 having a substantially L-shaped cross section and is supplied from the duct outlet 3-1. Warm air is supplied to the air vents 1-11.

That is, according to this embodiment, the combustion chamber 1-
Even if 1 is narrow, a large amount of warm air can be easily supplied from the air supply duct 3 and stable combustion can be maintained. This is one factor, and it can be operated even on a space scale of a general private garden. The miniaturization to the extent possible is achieved. In FIG. 3, 2-11 is a water supply port to the tender water tank 2-1.

FIG. 2 is a block diagram of an operation control system in this tender model steam locomotive. Speed sensor TG,
The sensor signals from the curved road sensor 2E, the boiler water level sensor 2F, and the tender water level sensor 2H are supplied to the operation control unit 2
It is given to the control circuit CNT in B. Then, the control circuit CNT controls the drive of the steam valve 2D and the water supply pump 2G.

FIGS. 4A and 4B are a plan view and a side view of the operation control unit 2B. In the figure, 4
-1 is a printed circuit board, 4-2 is an alarm buzzer, 4-3 is an operation panel, 4-4 is a power switch, R1 and R2 are relays, 4-8 is a first external terminal, and 4-9 is a second. It is an external terminal of. The first external terminal 4-8 is composed of 10 pins # 1 to # 10. The second external terminal 4-9 is composed of three pins # 11 to # 13. The operation panel 4-3 includes a variable resistor (speed setting device) Vr1, a yellow LED 4-5, and a red LED.
4-6, a steam valve operation confirmation push button 4-7 and a water supply pump operation confirmation push button 4-8 are provided. The operation control unit 2B is detachably mounted on the tender vehicle 2 with one touch by inserting the external terminals 4-8 into the socket.

FIG. 5 is a connection diagram showing a connection state of the control circuit CNT built in the operation control unit 2B and various sensors, various drive motors, LEDs and the like for the control circuit CNT.

The operation control operation of this tender model steam locomotive (hereinafter, simply referred to as a locomotive) will be described below with reference to the wiring diagram shown in FIG.

First, the speed control operation of a locomotive on a straight road will be described.

Now, it is assumed that the power switch 4-4 is turned on and the operation is performed. During operation, the speed signal (DC pulsating voltage) from the speed sensor TG attached to the tender vehicle 2 is given to the # 2 pin to # 10 pin of the external terminal 4-8. This speed signal is smoothed by a smoothing circuit composed of a resistor r12 and a capacitor C1, and is a comparator (opamp) I as a DC voltage V _TG according to the detected speed.
It is applied to the non-inverting input terminal of C1. In this example,
The DC voltage (detection voltage) V _TG is 0 to 8 depending on the detection speed.
It changes in the range of about 0 mV.

At the inverting input terminal of the comparator IC1, the divided voltage taken out by the variable resistor Vr1 is applied to the set voltage V _S.
Is given as. This set voltage V _S can be freely changed by adjusting the resistance value of the variable resistor Vr1. That is, in this embodiment, the set voltage V _S is
By adjusting the resistance value of the variable resistor Vr1 on the operation panel 4-3 of the operation control unit 2B, it is determined corresponding to the upper limit value of the set speed to be maintained on the straight road.

During operation, when the detected voltage V _TG exceeds the set voltage V _S , the output of the comparator IC1 becomes "H" level. As a result, the transistor T5 is turned on and the relay R2
Of the coil R2C is energized, and its normally open / normally closed contact r
2 _y1 and r2 _y2 are the connection status shown by the dotted line in the figure. As a result, the normally open / normally closed contact r2 _y1 -pin # 11-closed side limit switch Lm1-relay (brake relay) R3
Coil R3C- # 13 pin - the current flows in the path of the normally open-normally closed contact r2 _y2, coil R3C relay R3 is energized energized, connection status of the normally open-normally closed contact r3 _y1 is represented by a broken line in the drawing Becomes As a result, the steam valve motor SV is shown as A in the figure.
The electric current flows in the direction of positive rotation, and the steam valve motor SV
The steam valve 2D is closed by receiving the driving force of the above, the steam supplied to the steam engine is shut off, and the detection voltage V _TG, that is, the traveling speed is reduced. When the steam valve 2D is closed, the closing-side limit switch Lm1 detects it and turns it off, cutting off the power supply to the steam valve motor SV.

When the traveling speed decreases and the detection voltage V _TG decreases with respect to the set voltage V _S by a constant voltage width (operation width) determined by the resistors r13 and r14, that is, the traveling speed is lower than the lower limit value of the set speed. When it decreases, the output of the comparator IC1 returns to the "L" level. As a result, the transistor T5 is turned off, the energization of the coil R2C of the relay R2 is released, and the normally open / normally closed contacts r2 _y1 and r2 _y2 are in the connection state shown by the solid line in the figure. As a result, a current flows in the path of the normally open / normally closed contact r2 _y1- # 13 pin-coil R3C-open side limit switch Lm2- # 12 pin-normally open / normally closed contact r2 _y2 to reversely rotate, and the relay R3. Coil R3C
Is energized and its normally open / normally closed contact r3 _y1 is in the connection state shown by the dotted line in the figure. As a result, the steam valve motor SV
A current flows in the direction B in the figure, the steam valve 2D is opened by receiving the driving force of the steam valve motor SV, the supply of steam to the steam engine is restarted, and the detection voltage V _TG, that is, the traveling speed increases. Become. In addition, when the steam valve 2D is opened, the open side limit switch Lm2 detects the fully open state of the steam valve 2D, and the steam valve 2D is turned off to cut off the power supply to the steam valve motor SV.

By such feedback control, the traveling speed on the straight road is maintained between the upper limit value and the lower limit value of the set speed.

Next, the speed control operation of this locomotive on a curved road will be described.

When the locomotive enters the curved road, this is detected and the phototransistor PT2 of the curved road sensor 2E is turned on. As a result, the # 2 pin and the # 9 pin become conductive, and the current to the resistor r10 is shunted to the resistor r11. As a result, the set voltage V _S to the inverting input terminal of the comparator IC1 decreases by a predetermined amount. Will be things. Therefore,
When the vehicle enters a curved road, the traveling speed is maintained between the upper limit value and the lower limit value of the set speed which is lower than the traveling speed on the straight road by a predetermined amount. In this embodiment, the traveling speed on a curved road is reduced by about 30% with respect to the traveling speed on a straight road.

That is, according to this embodiment, since the traveling speed is controlled to be decelerated on a curved road, it is possible to prevent an acceleration / derailment accident due to an excessive centrifugal force on a curved track portion on a downhill. It will be possible to secure safe driving after achieving the miniaturization to the extent that it can be operated even on the space scale of the private garden.

FIGS. 6A and 6B show the speed sensor TG.
3A and 3B are a plan view and a side view showing an attachment state of the. The speed sensor TG is attached to the rear carriage 2-3 of the tender vehicle 2. That is, the frame 6 having a substantially U-shaped cross section attached through the front and rear wheel axles of the rear bogie 2-3.
A speed sensor body 6-2 using a small model magnet motor is fitted inside -1, and reduction gears 6-3, 6-
The rotation speed proportional to the traveling speed is transmitted to the speed sensor main body 6-2 via No. 4. Then, the DC pulsating voltage which is almost proportional to the traveling speed from the speed sensor body 6-2 is applied to the output terminals 6-51 and 6-52 through the lead wires 6-21 and 6-22.

Here, the speed sensor body 6 which indicates the traveling speed
The DC pulsating voltage from -2 will switch its polarity to + and-in response to forward and backward movements of this locomotive. If this DC pulsating voltage is directly applied to the control circuit CNT,
The speed control can be performed only when the input polarity to the non-inverting input terminal of the comparator IC1 is + (either forward or backward).

Therefore, in this embodiment, an automatic polarity switching mechanism is provided so that the input polarity to the non-inverting input terminal of the comparator IC1 is always +, regardless of whether the locomotive is moving forward or backward.

That is, the front wheel axle 2- of the rear bogie 2-3.
Insulation pipe 6-6 is press-fitted and fixed to 31, and the hook-shaped tip of output terminal 6-51 is provided in one of the two grooves formed on the outer periphery of this insulation pipe 6-6, and output terminal 6 is provided in the other groove. The hook-shaped tip of -52 is frictionally engaged (see FIG. 6C). Then, as shown in FIG. 6 (d) as viewed in the direction of arrow C in FIG. 6 (a), openings 6-11 to 6-14 are provided on the front surface of the frame 6-1 at two upper and lower locations, respectively, and the cross section is substantially the Pointers 6-71 and 6-72 made of a U-shaped conductive member
Open the legs of the frame 6-1 from the front side and open the hole 6-1.
1, 6-13 and 6-12, 6-14 are press-fitted via an insulator, and are provided in a state of being diagonally crossed (insulated crossing) via a space. Then, the ends of the output terminals 6-51 and 6-52 are positioned between the legs so that the legs of the pointers 6-71 and 6-72 projecting to the rear surface side of the frame 6 can be rotationally contacted. There is. Note that lead wires 6-81 and 6-82 are connected to the pointers 6-71 and 6-72.

According to this automatic polarity switching mechanism, when the locomotive is moving forward, the ends of the output terminals 6-51 and 6-52 come into rotational contact with the lower legs of the pointers 6-72 and 6-71. The # 10 pin connected to the lead wire 6-82 is given a DC pulsating voltage of + polarity as a speed signal, the input polarity to the non-inverting input terminal of the comparator IC1 is +, and the speed is controlled normally. Will be things. On the other hand, when the locomotive is moving backward, the ends of the output terminals 6-51 and 6-52 come into rotational contact with the upper legs of the pointers 6-71 and 6-72. Even if the polarity of the obtained DC pulsating voltage is reversed, the DC pulsating voltage of + polarity is given as a speed signal to the # 10 pin connected to the lead wire 6-82, to the non-inverting input terminal of the comparator IC1. The input polarity is set to +, and speed control is performed normally.

FIGS. 8A and 8B show a curved road sensor 2
It is the top view and side view which show the attachment condition of E.

The curved road sensor 2E is attached to the front bogie 1-3 of the steam locomotive 1. The front trolleys 1-3 are
It is equipped with wheels 8-1, a frame 8-2, and an axle 8-5, and is mounted so as to be movable left and right relatively to the main frame 2-4 on a curved road. Therefore, front trolley 1
-3 frame 8-2 has a substantially L-shaped shielding plate 8-
3 is attached and fixed to the main frame 2-4 side to provide a bracket 8-4 having a substantially U-shaped cross section, and the light emitting diode LED2 and the phototransistor PT2 are provided with a shielding plate 8-3 on the bracket 8-4. The curved road sensor 2E is configured by being opposed to each other through the curved road sensor 2E.

According to this curved road sensor 2E, when the locomotive is on a straight road, the shield plate 8-3 blocks the light from the light emitting diode LED2 to the phototransistor PT2, so that the phototransistor PT2 operates. It does not turn on, and the set voltage V _S to the non-inverting input terminal of the comparator IC1 does not drop. When the locomotive enters the curved road, the shield plate 8-3 shifts to the left or right according to the movement of the front carriage 1-3 to the left and right with respect to the main frame 2-4, so that the light from the light emitting diode LED2 is transferred to the phototransistor. The light is received by PT2, and the phototransistor PT2 is turned on. As a result, the set voltage V to the non-inverting input terminal of the comparator IC1
_S is lower than the set voltage V _S for the straight road by a predetermined amount.

A viewing window 8-6 is formed in the bracket 8-4 fixed to the main frame 2-4. The viewing window 8-6 is used to properly attach the shield plate 8-3.

7 (a) and 7 (b) are a plan view and a side view showing how the steam valve 2D, the steam valve motor SV and the like are attached, and FIG. 7 (c) is a direction D arrow in FIG. 7 (b). It is a perspective view.

In this mounting condition, the voltage of the + polarity given from the # 11 pin is the limit switch Lm on the closing side.
1 limit contact 7-8-common contact 7-9-relay-R
+ Of the steam valve motor SV through the normally open contact (NO contact) of 3
Is applied to the side input end, and the # -side input end of the steam valve motor SV becomes negative through # 13 pin, the steam valve motor SV
Rotates in the positive direction. With the rotation of the steam valve motor SV, the cam 7-5 passes through the speed reducer 7-3 and the cam shaft 7-4.
Rotates. This rotation causes the cam 7-5 to move to the insulator 7-
7, the valve shaft 7-11 is pushed into the valve body 7-12 against the compression spring 7-14, and the valve port inside the valve body 7-12 is closed. As a result, the steam to the steam supply pipe 7-16 is shut off and the steam engine is stopped.

When the valve shaft 7-11 reaches the valve port fully closed position, the flange portion of the insulator 7-7 closes the limit contact 7-.
8 is separated from the common contact 7-9. As a result, the power supply to the steam valve motor SV is cut off and the relay R3
The energization of the coil R3C is also released. Coil R3C
Release of the energization of the relay causes NO in relay R3.
The contact is opened and the normally closed contact (NC contact) is closed. That is, when the power supply to the steam valve motor SV is cut off, N
By closing the C contact, both input terminals are short-circuited. As a result, the steam valve motor SV suddenly stops, and the valve port inside the valve body 7-12 is reliably closed. When not short-circuiting both input terminals of the steam valve motor SV, the steam valve motor SV
Since V is not suddenly stopped, the rotation of the cam 7-5 goes too far. As a result, the valve port inside the valve body 7-12 is opened again, and the closing side limit contact 7-8 is opened again to the common contact 7-.
As a result of being in contact with 10, there arises a problem that the steam valve motor SV falls into a state where it keeps rotating.

On the other hand, through the # 13 pin, the steam valve motor S
A voltage of + polarity is applied to the − side input terminal of V, and the # 12 pin − limit contact 7-10 of the open side limit switch Lm2.
-Common contact 7-9-Release-When the + side input end of the steam valve motor SV becomes the-polarity through the NO contact of the R3, the steam valve motor SV rotates in the opposite direction. With the rotation of the steam valve motor SV, the cam 7-5 rotates via the speed reducer 7-3 and the cam shaft 7-4. By this rotation, the valve shaft 7-11 moves in the direction of coming out of the valve body 7-12 while receiving the restoring force of the compression spring 7-14, and the valve port inside the valve body 7-12 is opened. As a result, the steam supply pipe 7-1
The supply of steam to 6 is restarted, and the steam engine starts operating.

When the valve shaft 7-11 reaches the valve port fully open position, the flange portion of the insulator 7-7 opens the limit contact 7- on the open side.
10 is separated from the common contact 7-9. As a result, the power supply to the steam valve motor SV is cut off and the relay R
The NC contact 3 is closed and the steam valve motor SV is suddenly stopped.

Next, the control operation of the boiler water level in this locomotive to a fixed position will be described.

When the water level in the boiler chamber 1-2 (boiler water level) falls below a fixed position due to the supply of steam to the steam engine, the light from the light emitting diode LD1 constituting the boiler water level sensor 2F to the phototransistor PT1 is cut off. To be done. As a result, the phototransistor PT1 is turned off, the transistor T3 is turned off subsequently, the transistor T4 is turned on, and the coil R1C of the relay R1 is energized and energized. This coil R1
Due to the energization of C, the normally open contact r1y of the relay R1 is closed, and the feed water pump motor WP is driven.

When the water supply pump motor WP is driven, in FIG. 3, it goes through the joint 10-1 and the speed reducer 10-2,
The crank rod 10-3 reciprocates the plunger 10-5 of the water supply pump 2G. By the reciprocating movement of the plunger 10-5, the makeup water stored in the tender water tank 2-1 is absorbed from the upper port of the valve housing 10-6, and the absorbed makeup water is absorbed by the water absorption valve 10-7 and the discharge valve 10. Water is supplied from the discharge pipe 10-10 to the boiler chamber 1-2 through -8. The water supply pump 2G is mainly installed in the cylinder 10-4 and the valve housing 10-6 and is installed underwater in the bottom of the tender water tank 2-1. The water supply pump 2G has a structure that can be attached and detached by a mounting nut 10-9.

When the boiler water level returns to a fixed position by supplying water to the boiler chamber 1-2, the light from the light emitting diode LED1 is re-incident on the phototransistor PT1. As a result, the phototransistor PT1 is turned on, the normally open contact r1y of the relay R1 is opened, the drive of the water supply pump motor WP is stopped, and the water supply to the boiler chamber 1-2 by the water supply pump 2G is interrupted.

In this way, the water supply pump 2G having a supply capacity equal to or greater than the amount of water consumed by the steam engine is intermittently controlled, and the boiler water level is always maintained at a fixed position.

That is, according to this embodiment, it is not necessary to perform the water supply operation with the manual pump while monitoring the water level gauge during traveling, and the steam can be automatically and stably supplied to the steam engine. One factor is the miniaturization of a private garden to the extent that it can be operated even on a space scale.

The boiler chamber 1-using the water supply pump 2G
When the water level in the tender water tank 2-1 is lowered to the set minimum water level by supplying water to 2, the tender electrode TP of the tender water tank sensor 2H is separated from the water surface, and the # 2 pin and the # 6 pin become non-conductive, The transistor T1 is turned off, the transistor T2 is turned on, and the buzzer 4-2 sounds to request replenishment of water supply to the tender water tank 1-2.

9A and 9B show how the boiler water level sensor 2F is mounted. FIG. 9A is a side view of the main part of the same, FIG. 9B is a sectional view taken in the direction of the arrow E in FIG. FIG. 7C is a sectional view taken in the direction of the arrow F in FIG. That is, inside the window of the rear operation room of the boiler room 1-2, the steam pipe 9
-7, the gauge tube 9-1 is provided in the water level gauge housing 9-5 which is communicated with the inside of the boiler room 1-2 through the water conduit 9-6, and the LED 1 and the phototransistor are sandwiched by the gauge tube 9-1. PT1 and PT1 are fixed to the bracket 9-2 and arranged obliquely. When the boiler water level exceeds the fixed position,
Light from the LED 1 travels through the window 9-9 by refracting in water and is received by the phototransistor PT1 through the window 9-8, so that the phototransistor PT1 is turned on.
When the water level of the boiler falls below the fixed position, the light from the LED 1 travels almost straight through the water vapor in the tube, so that it is not received by the phototransistor PT1 and the phototransistor PT1 is turned off.

In this embodiment, a peep window 9-10 is provided for practical use so that the water level condition can be visually checked from the outside and the inside of the gauge tube 9-1 can be monitored. Further, the inner surface of the gauge tube 9-1 can be cleaned by removing the plug 9-11 on the lower side of the water level gauge housing 9-5.

Next, the priority operation of the speed control with respect to the fixed position control of the boiler water level in this locomotive will be described.

When the locomotive travels forward and travels downhill from a flat section, the boiler chamber 1-2 is bent forward to change the water surface position, the phototransistor PT1 of the boiler water level sensor 2F is turned off, and the water supply pump. The drive of the water supply pump 2G by the motor WP is requested. At the same time, when the vehicle goes downhill, the power load is reduced and the locomotive is accelerated. When the upper limit of the set speed is exceeded, the output of the comparator IC1 becomes "H" level, and the steam valve motor SV
To close the steam valve 2D. In this way, if electric power is to be supplied to two power sources (water feed pump motor WP and steam valve motor SV) at the same time, the water supply pump 2G and the steam cannot be supplied because the power supply margin is insufficient due to the practical storage space limitation in the small model. The operation of the valve 2D becomes uncertain.

Therefore, in the present embodiment, the water supply to the boiler chamber 1-2 is not urgent, and the closing of the steam valve 2D is urgent to prevent derailment. Therefore, the closing of the steam valve 2D, that is, the speed control is performed. Will be given priority.

The priority of the speed control is realized by connecting the collector of the transistor T3 and the # 13 pin via the diode D2. That is, the boiler room 1
When -2 becomes a low water level, the phototransistor PT1 is turned off, so that the transistor T3 is turned off. Here, if there is no path to the diode D2, the transistor T4 is turned on and the feed water pump motor WP is being driven. However, since there is a path for the diode D2, if the output of the comparator IC1 becomes "H" level and the # 13 pin becomes a low potential due to the speed increase exceeding the upper limit value of the set speed, the transistor T3 passes through the diode D2.
Also has a low potential, and the transistor T4 is not turned on. Therefore, even if the boiler chamber 1-2 becomes low in water level and the phototransistor PT1 is turned off, power is not supplied to the feedwater pump motor WP (no fixed position control of the boiler water level is performed), and only the steam valve 2D is operated. Only the speed control is performed and the speed control operation is ensured.

In this embodiment, the power switch 4
-4 is capable of simultaneously opening and closing a 3-volt DC power supply circuit (E1) with two AA dry cells and a 3-volt DC power supply circuit (E2) with two AA dry cells.
It is provided. The power source E1 is used for driving the feed water pump motor WP and the steam valve 2D, and the power source E2 is the comparator I.
It is used to supply power to C1 and generate an accurate set voltage V _S.

Further, in this embodiment, the LED 4-5 is connected in parallel to the coil R2C of the relay R2, and when power is supplied to the coil R2C, the LED 4-5 causes the operation panel of the operation control unit 2B to operate. In 4-3, the yellow light is turned on (see FIG. 4), and the closing operation state of the steam valve 2D accompanying the energization of the coil R2C is displayed. Further, LEDs 4-6 are connected in parallel to the water supply pump motor WP, and when the water supply pump motor WP is driven, the LEDs 4-6 are connected.
Lights up in red on the operation panel 4-3 to display the water supply operation state to the boiler room 1-2 accompanying the drive of the water supply pump motor WP. These LEDs 4-5 and 4-6 are lit, blinked,
It is possible to check the operation before starting operation, the power supply, etc. by the brightness etc., and it can also be useful for diagnosis in case of malfunction.

Further, in the present embodiment, the switch SW2 is connected between the emitter and collector of the transistor T5, and when the steam valve operation confirmation push button 4-7 is pushed on the operation panel 4-3 of the operation control unit 2B. , The switch SW2 short-circuits the emitter and collector of the transistor T5. This makes it possible to confirm the closing operation of the steam valve motor SV. When the steam valve operation confirmation push button is released from 4-7, the opening operation of the steam valve motor SV can be confirmed. Further, the switch SW1 is connected between the emitter and collector of the transistor T4, and when the feed water pump operation confirmation push button 4-8 is pressed on the operation panel 4-3, the switch SW1 short-circuits the emitter and collector of the transistor T4. . Thereby, the operation of the water supply pump motor WP can be confirmed. By confirming these operations while the boiler internal pressure is air-pressurized above the operating steam pressure, it is possible to diagnose and recover from wear deterioration of moving parts, running out of lubricating oil, power battery exhaustion, various failures, etc. Can be prepared for actual driving.

[0054]

As is apparent from the above description, according to the present invention, in the first invention, when hot air is blown from the upper part of the tender water tank, the air supply which is penetrated into a substantially L-shaped section is provided. The hot air is supplied from the outlet of the air supply duct to the air supply port to the combustion chamber through the duct, and the hot air can be supplied to the combustion chamber easily and in large quantities. As a factor, it is possible to achieve downsizing so that it can be operated even on a space scale of a general private garden. Further, in the second aspect of the invention, when the water level in the boiler chamber is lower than the fixed position, the water supply pump is driven, the makeup water stored in the tender water tank is supplied to the boiler chamber, and the water level in the boiler chamber is fixed. The position is automatically maintained, and with this as a factor, it is possible to achieve downsizing to the extent that it can be operated even on a space scale of a general private garden. Further, in the third aspect of the invention, when the curved road detecting means detects the entry into the curved road, the set speed is reduced by a predetermined amount, and the opening / closing time of the steam valve is increased in order to maintain the traveling speed at the lowered set speed. The vehicle speed is controlled, that is, the traveling speed is controlled to be decelerated on a curved road, which makes it possible to prevent an acceleration / derailment accident due to an excessive centrifugal force on a curved track portion on a downhill. Invention, second
Applying to a tender model steam locomotive that has been miniaturized to the space scale of a general private garden by an invention, etc.
The safe driving can be secured. Further, in the fourth invention, since the first invention, the second invention, and the third invention are combined, it is possible to achieve a small size that can be operated even on a space scale of a general private garden, and it is safe. The operation can be secured.

[Brief description of drawings]

FIG. 1 is a basic configuration diagram showing an embodiment of a tender model steam locomotive according to the present invention.

FIG. 2 is a configuration diagram of an operation control system in the tender model steam locomotive.

FIG. 3 is a partially cutaway plan view and a partially cutaway side view of a tender vehicle in this tender model steam locomotive.

FIG. 4 is a plan view and a side view of an operation control unit in this tender model steam locomotive.

FIG. 5 is a control circuit built in this operation control unit and various sensors, various drive motors, and LEs for the control circuit.
The figure which shows the connection condition of D etc.

FIG. 6 is a view showing how the speed sensor is attached to the tender model steam locomotive.

[Figure 7] Steam valve in this tender model steam locomotive,
The figure which shows the attachment condition of a steam valve motor etc.

FIG. 8 is a view showing how the curved road sensor is attached to the tender model steam locomotive.

FIG. 9 is a view showing how the boiler water level sensor is attached to the tender model steam locomotive.

[Explanation of symbols]

 1 Steam locomotive 1-1 Combustion chamber 1-2 Boiler chamber 1-11 Air supply port 2 Tender car 2-1 Tender water tank 3 Air supply duct 3-1 Duct outlet 2G Water supply pump WP Water supply pump motor 2F Boiler water level sensor CNT Control circuit 2D Steam valve SV Steam valve motor 2E Curved road sensor 2H Tender water level sensor 4-2 Buzzer

Claims (4)

[Claims] 1. A tender model steam having a steam locomotive provided with a combustion chamber and a boiler chamber, and a tender vehicle provided with a tender tank connected to the steam locomotive for storing make-up water for the boiler chamber. In the locomotive, an air supply duct is provided by penetrating the tender water tank from its upper part in a substantially L-shaped cross section, and an air outlet of the air supply duct is located opposite to an air supply port to the combustion chamber. It is a tender model steam locomotive. 2. A tender model steam having a steam locomotive provided with a combustion chamber and a boiler chamber, and a tender vehicle provided with a tender tank connected to the steam locomotive for storing makeup water for the boiler chamber. In a locomotive, a water feed pump arranged in the tender vehicle, a water level drop detecting means for detecting a water level drop relative to a fixed position in the boiler chamber, and the water feed pump based on the detection result of the water level drop detecting means. A tender type model steam engine comprising: a water level maintaining means for driving and maintaining the water level in the boiler chamber at a fixed position, for supplying makeup water stored in the tender water tank to the boiler chamber. car. 3. A steam valve arranged in a steam supply passage to a steam engine, speed detecting means for detecting a traveling speed, and the steam valve for maintaining a traveling speed detected by the speed detecting means at a set speed. A traveling speed maintaining means for controlling the opening / closing time of the vehicle, a curved road detecting means for detecting entry into a curved road, and a traveling speed decelerating means for lowering the set speed by a predetermined amount based on the detection result of the curved road detecting means. A tender model steam locomotive characterized by being equipped. 4. A tender model steam having a steam locomotive provided with a combustion chamber and a boiler chamber, and a tender vehicle provided with a tender tank connected to the steam locomotive for storing make-up water for the boiler chamber. In the locomotive, the tender water tank is provided so as to penetrate from above into a generally L-shaped cross section, and the air outlet is located in the tender vehicle, the air inlet being located opposite the air inlet to the combustion chamber. A water supply pump, a water level drop detecting means for detecting a water level drop relative to a fixed position in the boiler chamber, and based on the detection result of the water level drop detecting means, drive the water feed pump to set the water level in the boiler chamber at a fixed position. To maintain the water level in the tender water tank to the boiler chamber, a steam valve arranged in the steam supply passage to the steam engine, and a running speed. A speed detecting means for detecting the traveling speed, a traveling speed maintaining means for controlling the opening / closing time of the steam valve so as to maintain the traveling speed detected by the speed detecting means at a set speed, and a curved road detecting for detecting an entry into a curved road. A tender model steam locomotive, characterized by comprising: means and traveling speed deceleration means for reducing the set speed by a predetermined amount based on the detection result of the curved road detection means.