JPS6213781A - Fuel pump for vehicle heating apparatus - Google Patents

Abstract

PURPOSE:To decrease the electric power consumption of a battery and diminish temperature change in a vehicle room by regulating the piston stroke of a fuel pump fixed to the hot water boiler of a vehicle heating apparatus according to the temperature change in the vehicle room to prevent the frequent operation starting and stopping of the hot water boiler. CONSTITUTION:A cylindrical piston 56 is mounted pivotally and reciprocatively in axial direction inside a pump case body 54. A notch 56a is formed on the piston 56, and successively connects a pump chamber with a suction pipe 25 and a discharge pipe 27 according to the rotation of the piston 56 which is generated through a worm wheel 58 fixed to the piston 56. The piston 56 is further reciprocated by the function of a cam surface 59 formed on the worm wheel 58. Thus hot water temperature brings a solenoid 29 into action to regulate the stroke of the piston 56 through a pin 64.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a combustion type vehicle in which a combustion type hot water boiler is provided in a cooling water circulation path of a vehicle engine to raise the temperature of the cooling water and circulate it. This relates to a fuel pump for a heating system.

(Prior art) There is a method for heating the cabin of a vehicle with an internal combustion engine that heats the cabin by supplying warmed circulating water after cooling the engine to a radiator in the cabin. When starting, idling, or when the engine output is low on a long descent, the cooling water does not warm up, so the heating effect in the cabin cannot be achieved sufficiently. For this purpose, there is a combustion type vehicle hot water boiler that is installed in the engine cooling water circulation path and raises the temperature of the cooling water to a temperature that satisfies the heating effect.

FIG. 7 shows an example of such a conventional device.

In the figure, 1 (see Figure 3) is the vehicle engine, 2 is the radiator, 3 is the radiator cap, 4 is the cooling water thermostat, 5 is the cabin radiator, 6 is the blower, 17 is the combustion type hot water boiler, and 8 is the combustion type hot water boiler. A combustion blower, 9 a fuel pump, 10 a burner, 11 a hot water circulation pump, and 12 a high temperature water switch.

In the conventional boiler described above, as a method of controlling the temperature of the cooling water, while the temperature of the cooling water is below a predetermined temperature, fuel is supplied to the boiler and burned in a burner to raise the temperature of the cooling water. When the temperature rises to a predetermined temperature or higher, the fuel supply is stopped and combustion in the burner is stopped.

(Problem to be Solved by the Invention) However, the fuel pump of the conventional device described above has a constant discharge amount, and the control method is to either operate the fuel pump to feed the fuel to the burner, or stop the operation of the pump to pump the fuel. There were only two ways to control the supply: stop the supply.

Therefore, when the boiler starts operating, if combustion in the burner is not yet complete, the fuel sent to the burner will not evaporate sufficiently and will not be combusted, and the excess fuel will accumulate at the bottom of the burner and generate soot. There was a problem in that there was a risk of it flowing out as drain.

1 Also, when the boiler burner is fired, the cooling water temperature quickly rises to a predetermined temperature or higher, for example in the early spring season. This often causes the boiler's fuel pump to cycle on and off, causing the burner to cycle through frequent combustion and shutdown cycles. Since the ignition must be ignited each time the combustion and shutdown cycle is repeated, the power consumption of the battery increases, which wears out the battery and ignition coil, shortening their lifespan. Furthermore, if the boiler is frequently shut down as described above, the temperature of the hot water will rise or fall, causing a large change in the temperature inside the passenger compartment, which is unpleasant.

(Means for Solving the Problems) In order to solve the above-mentioned problems, in the present invention, a cylindrical piston is provided in a case so as to be slidable and rotatable, and a cylindrical piston is provided on one side of one end of the piston. A notch is formed in the case, and a suction port and a discharge port corresponding to the notch are provided in the case, a worm gear that meshes with a driving worm is fixed to the other end of the piston, and a worm gear is attached to one side of the worm gear. A cam surface with steps is formed, a cam receiver that abuts against this cam surface is fixed to the case, a spring is provided to press the cam surface against this cam receiver, and a pin that is linked to the operation of the solenoid is brought into contact with the end surface of the piston. A fuel pump for a vehicle heating system is constructed by adjusting the stroke of the piston.

(Function) As described above, the fuel pump of the present invention can adjust the discharge amount by the action of the solenoid. By reducing the amount of fuel discharged, it is possible to prevent dangers due to soot generation and fuel leakage.

Furthermore, even when the water temperature rises quickly when the water is burned in a burner during the early spring season, according to the present invention, by reducing the discharge amount of the fuel pump, the boiler does not have to be shut down as often as in the past. It is no longer necessary to do so. Therefore, consumption of the battery and ignition coil is reduced, and fluctuations in hot water temperature are also reduced, so changes in temperature within the vehicle interior are also reduced.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 6. In the figure, 1 (see Figure 3) is the vehicle engine, 2 is the radiator, 3 is the radiator cap, 4 is the cooling water thermostat, 5 is the passenger compartment radiator, 6 is the blower, 113 is the combustion type hot water boiler, and 14 is the combustion type hot water boiler. A combustion blower fan, 15 a fuel pump according to the present invention, 16 a burner, and 17 a hot water circulation pump.

18 is a motor having output shafts on the left and right sides;
A combustion blower fan 14 is fixed to one shaft, and a fuel pump drive pulley 19 and a pump drive pulley 20 are fixed to the other output shaft. The combustion blower fan 14 is placed in a case on the motor side of the boiler 13.

The fuel pump 15 has a pulley 21 fixed to its shaft, and a belt 22 that runs around the pulley 19 and the pulley 21.
It is driven by a motor 18 via. Further, the hot water circulation pump 17 has a pulley 23 fixed to its shaft, and is driven by a motor 18 via a belt 24 that extends around the pulleys 20 and 23. 25 is the fuel pump 15
A fuel cutoff valve 26 is installed in the middle of the suction side piping. 27 is a pipe on the discharge side of the fuel pump 15, which is wound around the exhaust pipe 28 of the boiler 13, and its end is connected to the burner 16 of the boiler 13 (see FIG. 4). 29 is a solenoid provided in the fuel pump 15.

30 has four piping connection ports A on the outer circumference of the cylindrical case.

This is a four-way switching valve that has B, C, and D, and incorporates a rotary valve that has one groove that communicates the adjacent connection ports. The piping connection port A of this four-way switching valve 30 is connected to the water inlet of the hot water circulation pump 17 via a piping 31, and the piping connection port adjacent to the piping connection port A is connected to the engine via a piping 32. It is connected to the cooling water outlet of No. 1. In addition, the discharge pipe 33 of the boiler 13 is branched into two, one pipe 34 is connected to the cooling water inlet of the vehicle interior radiator 5, and the other pipe 35 is connected to the connection port A of the four-way switching valve 30. It is connected to the connection port C located at the symmetrical position. In addition, the water discharge pipe 36 of the vehicle interior radiator 5 is branched into two, one pipe 37 is connected to the water return port of the engine 1, and the other pipe 38 is connected to the connection port of the four-way switching valve 30. It is connected to the connection opening located in a plane symmetrical position.

Also, near the water outlet above the boiler 13, there is a high temperature water switch 39 whose electrical contact opens at T1 (e.g. 87°C) or higher.
is provided, and this switch 39 is connected to the fuel cutoff valve 26.
is electrically connected to. Also, at almost the same position is a low temperature water switch 4 whose electrical contact closes at T2 (e.g. 82°C) or higher.
0 is provided and electrically connected to the solenoid 29. Note that T,>T2.

Reference numeral 41 denotes a burner temperature switch provided on the wall of a part of the burner of the boiler 13, which opens when the temperature is lower than a set temperature T3 (for example, 130° C.).

4 and 5 are detailed views of a portion of the burner of the combustion type hot water boiler 13. FIG. 42 is a combustion tube, 43 is an ignition plug mounting tube inserted and fixed almost tangentially to the combustion tube 42;
Reference numeral 44 denotes an ignition plug inserted into this mounting tube 43 and screwed into place, and an electric heating coil 44a is wound around this ignition plug 44. A heat insulating material 45 is provided on the outer periphery of the ignition plug mounting tube 43.
It is fitted. 46 is a partition plate between the fan 14 and the combustion chamber, and this partition plate 46 has an opening 4 as shown in FIG.
7 is a provision. 48 is a partition plate 4 along this frontage 47.
6 is a protruding curved guide plate; 49 is a combustion air outlet; 50 is a combustion air outlet;
51 is an air hole for introducing air into the ignition plug mounting tube 43;
(See FIG. 5) is a baffle for converting the swirling flow of combustion gas in the combustion tube 42 into a swirling contraction flow.

As shown in FIG. 4, the spark plug mounting tube 43 has a gap a between the outer circumferential surface of the tube and the inner circumferential surface of the combustion tube 42, and has an arcuate front shape as shown in FIG. Then, a liner 52 having a channel-shaped side cross-sectional shape as shown in FIG. An evaporation member 53 is provided along the bottom inner peripheral surface of the tube 42 and is attached to the lower half of the inner surface of the ignition plug mounting tube 43 and the upper surface of the liner 52. The evaporation member 53 is made of a layer of fibers such as silica wool.

Further, 27 shown in FIG. 4 indicates the fuel pump 1 as described above.
The discharge side piping of No. 5 is wrapped around the exhaust pipe 28 connected to the combustion tube 42 of the boiler 13, and its tip is inserted through the heat insulating material 45, the spark plug mounting tube 43, and the evaporation member 53 of the burner 16 to connect the burner. This is to supply fuel to the inside of 16.

Further, FIGS. 1 and 2 show details of the fuel pump 15 of the present invention, where 54 is a pump case body and 55 is a case lid. A cylindrical piston 56 is provided inside the pump case body 54 so as to be rotatable and slidable in the axial direction, and a flat notch 56a is formed in one side of the lower part of the piston 56. There is. 57 is piston 5
This is a coil spring inserted between the lower end surface of the case body 6 and the hole bottom surface of the case body 54. A worm gear 58 is fixed to the upper end of the piston 56, and as shown in FIG. It is formed. The worm gear 5B meshes with a worm 4-60 rotatably provided within the case body 54.
M60a is driven by the morph 18 via the pulley 21 and belt 22 described above.

61 is a cam receiver protruding from the bottom surface of the case lid 55;
The lower end surface of this cam receiver 61 abuts against the cam surface 59. 62 is a plate fixed on the case lid 55, and the above-mentioned solenoid 2 is mounted on this plate 62.
9 is fixed and swings, and a bracket 63 is provided protrudingly. A pin 64 passes through the plate 62 and the case lid 55, and its lower end surface abuts the upper end surface of the piston 56. The upper end surface of this pin 64 is connected to the solenoid 29.
When it is demagnetized, it protrudes above the plate 62 by a distance d (d<c), as shown in FIG. Reference numeral 65 denotes an L-shaped arm rotatably supported on the bracket 63 via a shaft 66. The upper end of this arm 65 is connected to the operating rod 29 & of the solenoid 29 via a pin 67. The end portion of the pin 64 is joined to the upper surface of the pin 64. Therefore, when the solenoid 29 is energized, the operating rod 29a retracts and the arm 65 rotates clockwise in FIG. 1, thereby lowering the pin 64 by a distance d.

4 Further, 54a is an inlet provided in the case body 54, to which the pipe 27 described above is connected, and 54b is a discharge port, to which the pipe 25 described above is connected.

Further, FIG. 6 shows the control circuit of this embodiment, and E represents a power supply batch IJ-1F a fuse.

The burner temperature switch 41 is connected to the power supply E via the relay R1, the contact 5W-1 of the manual switch 5IIl, and the fuse F. The motor 18 is connected in parallel to the relay R1 and the burner temperature switch 41, and the solenoid 29
and low temperature water switch 40 series circuit, and timer + I
Each of the J series R is connected in parallel with the motor 18.

Further, the normally open contact TR-1 of the timer relay TR is connected in parallel with the low temperature water switch 40, and the normally open contact R1-1 of the relay R1 is connected in parallel with the contact 5W-1.

Further, for the series circuit of contact R1-1 and timer relay TR, another contact S2 of manual switch SW, normally closed contact R1-3 of relay R1, relay 82, and high temperature water switch 39 are connected in series. The circuits are connected in parallel, and a series circuit of normally closed contact R1-2 of relay R1, normally open contact R2-1 of relay R2, and spark plug 44 is connected to contact R1.
-1 and timer relay TR are connected in parallel to the series circuit. Further, the fuel cutoff valve 26 is connected in parallel to the relay R2, and the normally open contact R2-2 of the relay R2 is connected in parallel to the normally closed contact R1-3.

Next, the operation of this embodiment configured as described above will be explained.

When the connection port A and the connection port of the four-way switching valve 30 are brought into communication, the engine 1 and the water pump 17 are communicated via the four-way switching valve 30. At this time, connection port B and connection port C of the four-way switching valve 30 are closed, so that the cooling water circulation circuit is formed from the engine 1 through the boiler 13 and back from the radiator 5 to the engine 1. . In this water circuit, the temperature of the circulating water is determined by the high temperature water switch 39 and the low temperature water switch 4.
When the manual switch 5ill of the control circuit is turned on when the burner 1 temperature is lower than the set temperature of the burner 1 temperature switch 41, the motor 18 rotates and the wind generated by the fan 14 is turned on. is the opening 4 of the partition plate 46
Air is blown into the combustion chamber from the combustion air outlet 49 through the combustion air outlet 49 through the ignition plug mounting pipe 43, and the air that enters the air hole 50 of the spark plug mounting pipe 43 is also blown out into the combustion chamber from the spark plug mounting pipe 43, joins together, and swirls within the combustion chamber. The flow becomes condensed at the baffle 51, passes through a heat exchanger, and is discharged from the exhaust pipe 28. In this case, the fuel cutoff valve 26 is open, allowing fuel to pass through.

The water pump 17 is also linked to the rotation of the motor 18 via the water pump drive pulley 23 and the water pump drive belt 24, so circulating water is circulated from the boiler 13 to the radiator 5 to the engine 1.
It is circulated through the four-way switching valve 30-boiler 13 circuit.

Further, since the fuel pump 15 is also linked to the motor 18 via the fuel pump driving pulley 19 and the fuel pump driving belt 22, the piston 56 meshing with the worm 60
Since the worm gear 58 integrated with the cam receiver 61 rotates, the cam receiver 61
Due to the effect of the step C on the cam surface 59, the piston 56 repeats reciprocating motion in the axial direction while rotating, sucks fuel from the fuel cutoff valve 26 side, passes through the fuel pipe 27 wrapped around the exhaust pipe 28, and supplies it to the burner. The liquid that has not completely soaked into the 16 evaporating members 53 is collected on the dish-shaped liner 52.

Next, when the timer relay TR operates and the same contact TR-1 closes after a period of time has elapsed, the operating rod 29a of the solenoid 29
As a result, the arm 65 and the pin 64 of the fuel pump 15
Push the piston 56 downward by a distance d through
The discharge capacity of the fuel pump 15 is reduced. Also, when the switch SW is closed, the spark plug 44 is energized and its coil 44a is turned on.
becomes red hot, so the fuel that has permeated into the evaporator member 53 evaporates, mixes with the air blown from the air hole 50 of the ignition plug mounting tube 43, and ignites.

In this embodiment, a dish-shaped liner 52 is suspended by a distance b from the combustion tube 42 which also serves as a heat exchanger, and an evaporator member 5 is placed above it.
3 is on top, the evaporator member 53 and dish-shaped liner 52 are rapidly heated by the heat of the ignited flame, and the fuel is also rapidly evaporated and gasified, so that combustion becomes active in a short period of time. As a result, the burner wall becomes hot and the burner temperature switch 41 is activated, which turns on the relay R1, opens the normally closed contact R1-2, and turns off the spark plug 44, but the burner 16 continues to burn vigorously. . Then, when the timer relay TR stops after the time has elapsed, contact TR-1
is opened, the solenoid 29 is demagnetized, and the fuel pump 15
Since the pin 64 of the fuel pump 15 is no longer pressed, the fuel pump 15 supplies fuel to the burner 16 at its full capacity, resulting in strong twist firing, and the combustion gas exchanges heat with the circulating water in the heat exchanger in the boiler 13. Raise the temperature all at once. The heat-exchanged combustion gas is exhausted from the exhaust pipe 28. At this time, since the exhaust pipe 28 is heated by the exhaust gas and becomes hot, the fuel in the fuel pipe 27 wrapped around the exhaust pipe 28 is heated and supplied to the evaporator member 53 in a state where it easily evaporates.

Further, since the outside of the ignition plug mounting tube 43 is covered with a heat insulating material 45, it is not exposed to cold air, so it is likely to become high temperature.

When the temperature of the circulating water in the boiler 13 becomes higher than the set temperature T2 of the low temperature water switch 40, the low temperature water switch 40 closes and the solenoid 29 is activated to shut down the fuel pump 15.
Reduces the discharge capacity of the fuel to produce weak combustion.

When the circulating water temperature becomes lower than T2, the low temperature water switch 40
opens to stop the solenoid 29, and as a result, the fuel pump 15 supplies fuel to the burner 16 at full capacity, rapidly raising the temperature of the circulating water by strong twist firing. In this way, strong twisting and weak combustion are repeated after reaching the set temperature T2 of the low temperature water switch 40. During this time, the rotation of the motor 18 is constant, so the amount of circulating water is constant. Low temperature water switch 4
When the water temperature rises in the weak combustion state in which 0 is activated and reaches the set temperature 11 of the high temperature water switch 39 or higher, the high temperature water switch 39 is opened, the fuel cutoff valve 26 is closed, and combustion is stopped. When the water temperature falls below the set temperature T of the high temperature water switch 39 and the burner temperature falls below the set temperature T3 of the burner temperature switch 41, the spark plug 44 and fuel cutoff valve 26 are energized to automatically ignite. resume. However, at this time, the burner is already warm, so the timer relay TR is not activated.

The circulating water is heated by the boiler 13 to become high-temperature water and passes through the vehicle interior radiator 5, so when the blower 6 is turned, the vehicle interior air exchanges heat with the vehicle interior radiator 5 and its temperature increases. The circulating water whose temperature has been lowered by radiating heat in the cabin radiator 5 is sent to the engine 1.
The water then returns to the boiler 13 via the four-way switching valve 30.

Next, when the temperature of the circulating water is sufficient to warm the passenger compartment only by the heat generated by the engine 1, turn off the switch SW of the boiler 13.
F, and when the four-way switching valve 30 is turned to connect the connection port and the connection port C, the circulating water of the engine 1 is transferred to the boiler 13.
Since the flow rate does not decrease (the temperature does not drop), it passes from the connection port of the four-way switching valve 30 through C, exchanges heat with the air in the cabin radiator 5, and then returns to the engine 1.This four-way switching valve Since the connection port A of 30 is closed with a valve, the water in the boiler 13 remains stationary.Furthermore, the four-way switching valve 3
Since the connection port B of 0 is also closed, the circulating water coming out of the interior radiator 5 flows only to the engine 1.

Next, turn the four-way switching valve 30 to connect ports A and B, close ports C, and turn on the switch St to operate the boiler 13. The boiler 13 heats the circulating water. , the heat is radiated by the vehicle interior radiator 5 and returned to the boiler 13 via the connection port B and A of the four-way switching valve 30. That is, in this case, only the water circuits of the vehicle interior radiator 5 and the boiler 13 are circulated. The interior of a vehicle can be efficiently heated while the engine 1 is stopped.

When the switch SW is turned OFF to stop the boiler 13, the fuel cutoff valve 26 closes and combustion stops, but the motor 18 continues to rotate until the burner temperature switch 41 reaches the set temperature or lower. Scavenge the gas in the furnace.

(Effects of the Invention) As described above, the fuel bottle 15 of the present invention has the solenoid 2.
Since the discharge amount can be adjusted by the action of the solenoid 29, when combustion in the burner 16 is still incomplete at the start of operation of the boiler 13, the soot and smoke can be reduced by reducing the amount of fuel discharged by the action of the solenoid 29. It is possible to prevent the occurrence of accidents and dangers due to fuel leakage.

Furthermore, even when the water temperature rises quickly when the water is burned in a burner during the early spring season, according to the present invention, by reducing the discharge amount of the fuel pump, the boiler does not have to be shut down as often as in the past. It is no longer necessary to do so. Therefore, wear and tear on the batch IJ- and ignition coil is reduced, and fluctuations in hot water temperature are also reduced, so temperature changes in the vehicle interior are also reduced, making the interior of the vehicle more comfortable.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of the fuel pump of the present invention, FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1, and FIG. Fig. 4 is a sectional view of a part of the burner of the combustion type hot water boiler, Fig. 5 is a sectional view taken along the line ■-V in Fig. 4, Fig. 6 is a control circuit diagram, and Fig. 7 FIG. 2 is an explanatory diagram showing a conventional device partially in cross section. 1... Engine 5... Vehicle interior radiator 13
... Combustion type hot water boiler 15 ... Fuel pump 16 ... Burner 17
...Hot water circulation pump 18...Motor 26...
Fuel cutoff valve 27...Piping (fuel pipe) 28
...Exhaust vibe 29...Solenoid 30.
...Four-way switching valves A, B, C, D...Piping connection port 39...High temperature water switch 40...Low temperature water switch 41...Burner temperature switch 42...Combustion tube 43... Spark plug mounting tube 44... Spark plug 45... Heat insulating material 52.
... Liner 53 ... Evaporation member 54 ...
Pump case body 55...Case lid 56...Piston 58
...Worm gear 59...Cam surface 60...
Worm 61...Cam receiver 64...Pin
65...L-shaped arm Fig. 1, Fig. 2, Fig. 4, Fig. 5, Fig. 52 (Liner 2 procedure amendment,
1 November 7, 1985 Mr. Michibu Uga, Commissioner of the Patent Office
21. Case description Patent Application No. 151215 of 1985 82.
Name of the invention Fuel pump for vehicle heating system 3 Relationship with the case of the person making the amendment Patent applicant Shintachikawa Aircraft Co., Ltd. 4, Agent 5 Subject of the amendment ``Detailed description of the invention'' column of the specification and "Piping 27" in the drawings and specification, page 11, line 20 is corrected to "piping 25.""Piping26" in the first line of page 12 is corrected to "piping 27." Among the drawings, Figure 1 is corrected as shown in the attached corrected drawing.

Claims (1)

[Claims] 1. A cylindrical piston is slidably and rotatably provided in a case, a notch is formed in one side of one end of the piston, and an inlet and an outlet corresponding to the notch are provided in the case, A worm gear that meshes with a driving worm is fixed to the other end of the piston, a cam surface having a step is formed on one side of the worm gear, and a cam receiver that abuts with this cam surface is fixed to the case. A fuel heating system for a vehicle, characterized in that the cam receiver is provided with a spring that presses the cam surface, and a pin that is interlocked with the operation of the solenoid is brought into contact with the end surface of the piston to adjust the stroke of the piston. pump.