JPH0445313A - Liquid fuel combustor - Google Patents

Abstract

PURPOSE:To reduce troubles concerning feeding of oil and prevent leaks of oil caused by the transfer of oil between a plurality of oil dishes and the failure of a control device by providing a feed pump for transferring the oil of a second oil dish to a first oil dish, a pump control means for starting the feed pump in response to the output of a oil quantity detecting means for the first oil dish and a safety control means for stopping the feed pump when the quantity of oil of the first oil dish has abnormally increased. CONSTITUTION:Since oil is used in the order of a fist feed oil tank 9 and a second feed oil tank 11, it is not necessary to frequently feed oil and a feed pump 15 is started depending on the quantity of oil of a first oil dish 8 to feed oil from a second oil dish 10 to the dish 8 and hence even when a combustion unit is installed in an inclined position, the oil in one oil dish is caused to flow to the other oil dish, preventing thereby leaks of oil. Furthermore, since safety control means S, T are provided to stop the feed pump when the quantity of oil in a oil dish has abnormally increased, when an oil quantity detecting means 16 or the pump control means has gone wrong, the feed pump is stopped by means of the safety control means to prevent oil leaks.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field This invention relates to liquid fuel combustion devices such as oil fan heaters and oil stoves.

(b) Conventional technology In this type of liquid fuel combustion device, a predetermined amount of oil is supplied from the oil supply tank to the oil pan, and the oil is supplied from the oil pan to the combustion part such as a burner. Allowing combustion to take place. However, the capacity of the refueling tank (
3-51) was small, so it was necessary to refuel frequently.

Therefore, in the method disclosed in Japanese Utility Model Publication No. 46-5412, a fuel tank and an oil pan are provided on the left and right sides of the combustion section, and the heights of the oil outlet of the left and right fuel tanks are set to be different. Even if one fuel tank becomes empty, fuel is supplied from the other tank and combustion continues.

(8) Problems to be Solved by the Invention This type of liquid fuel combustion device has the advantage that combustion can be continued for a longer period of time compared to a device with a single fuel tank and oil pan, and the hassle of refueling can be reduced. There is. However, since the left and right oil pans communicate through the combustion part, if the combustion device is installed at an angle, there is a risk that the oil in one oil pan will move to the other oil pan, causing an oil leak. there were.

This invention was made in view of the above facts,
To prevent oil leakage due to failure of a control device as well as oil leakage due to movement of oil between a plurality of oil pans while reducing troublesome oil supply.

(=) Means for Solving the Problems This invention includes a combustion section such as a burner, a first oil pan for storing oil to be supplied to the combustion section, and a first oil supply for replenishing oil to the oil pan. A tank, a second oil pan, a second oil supply tank that supplies oil to the oil pan, a supply pump that transfers oil from the second oil pan to a first oil pan, and a first oil pan. an oil amount detection means for detecting the oil amount in the first oil pan; a pump control means for starting and stopping the supply pump according to the output of the oil amount detection means; and a pump control means for starting and stopping the supply pump according to the output of the oil amount detection means; This configuration includes safety control means for stopping the operation.

In addition, the safety control means is configured to stop the supply pump when an oil level higher than the pump stop control level by the pump control means is detected, and to stop the supply pump when the operation time of the supply pump reaches a predetermined time. has been done.

(*) Effect While there is oil in the first oil tank, the oil replenished from the first oil tank to the first oil pan is supplied to the combustion section,
Combustion takes place in the combustion section. When the first oil tank becomes empty and the amount of oil in the first oil pan decreases, the oil in the second oil pan is transferred to the first oil pan by the supply pump, and from the first oil pan to the combustion section. Therefore, combustion in the combustion section can continue until the second oil supply tank becomes empty and the amount of oil in the second oil pan decreases. In this way, the oil is used up in the order of the first oil tank and the second oil tank, so there is no need to refuel frequently, and the supply pump can be turned on and off according to the amount of oil in the first oil pan, Since oil is supplied from the second oil pan to the first oil pan, even if the combustion device is installed at an angle, there is no risk of oil leaking from one oil pan to the other oil pan. Moreover, since it is equipped with a safety control means that stops the supply pump when the amount of oil in the oil pan increases abnormally, if the oil amount detection means or pump control means malfunction, the safety control means will stop the supply pump. This will prevent oil leakage.

(F) Example Hereinafter, an example in which the present invention is applied to a kerosene fan heater will be described with reference to the drawings.

In Figures 1 and 2, (1) is an exterior case that has a horizontally elongated warm air outlet (2) in the center of the front, and inside the exterior case (1) is a burner fan (3) and this burner fan. (3) A vaporizing burner (
4), a combustion tube (5) with an open top connected to this burner (4), an air guide device (6) facing this combustion tube (5), and the central part of the back of the exterior case (1). A blower fan that guides air flowing in from an air suction port (not shown) provided in the air to a blower guide device (6>), mixes it with combustion gas from a combustion tube (5), and discharges it from a hot air outlet (2). (7) is provided in the center, and on both sides there are right oil pans (8).
and a right oil tank (9), a right oil pan (8), and a left oil pan (10) and a left oil tank (11).
) is installed with a fuel pump (13) that supplies oil (kerosene) from the right oil pan (8) to the burner (4) via the oil pipe (12), and the left oil pan (10) A supply pump (15) is installed to transfer the oil (10) to the right oil pan (8) via the supply pipe (14). In addition, the right oil pan (8
) and the left oil pan (10) are equipped with float switches (oil amount detection means) (16) and (17), respectively.6 The upper part of the exterior case (1) is equipped with an operating section (18) and a lid. A fuel tank outlet (21) and (22) which are opened and closed at (19) and (20) are provided.

Note that (23) is a residual oil switch that senses the weight of the right fuel tank (9).

FIG. 3 shows a control device (24) for the oil fan heater. In Figure 3, (25) is a microcomputer (hereinafter referred to as microcomputer);
On the input side of 5), there is an operation switch (26), a temperature control switch (27) <28), a room temperature sensor (29>), a frame rod (30), and a reed switch that is opened and closed by a float switch (16). (31A), a reed switch (32) that is opened and closed by a float switch (17), and a residual oil switch (23).Furthermore, a burner fan (31A) is provided on the output side of the microcomputer (25).
3), the igniter (33), the fuel pump (13), the supply pump (15), the vaporization heater (34), and the display unit (
35) and a buzzer (B). Also,(
S) is provided outside the microcomputer (25) and is a reed switch (31) that is opened and closed by a float switch (16).
B) is a switching circuit that receives input, and when the reed switch (31B) is turned on, the supply pump is stopped regardless of the output of the microcomputer (25). This display section (35) has a room temperature sensor (
29) and the set temperature (desired temperature) adjusted by the temperature control switch (27) (2g). There is a message display section (37) on the left side and a message display section (37) that highlights the words "Refuel", both of which use liquid crystal.
34) is provided at the upper part of the outer case (1) adjacent to the operating section (18). Also, reed switch (31B
) is provided above the reed switch (31A).

When the operation switch (26) is turned on, the microcomputer (25)
) heats the vaporizer of the burner (4) with the vaporization heater (34). When the carburetor is sufficiently heated, the burner fan (3) is operated, and after purging the burner (4), the fuel pump (13) is operated, and the igniter (33) is activated. . As a result, when combustion occurs in the burner (4) and a flame detection signal is issued from the flame rod (30), the microcomputer (25) stops the igniter (33). During such combustion operation, the microcomputer (25) calculates the difference in temperature between the set temperature adjusted by the temperature control switches (27) and (28) and the room temperature detected by the room temperature sensor (29), and calculates the difference in temperature. The combustion amount is determined as shown in Figure 5 according to the following. Then, in order to obtain the combustion amount, the frequency of the fuel pump (electromagnetic pump) (13) is controlled, and the rotation speed of the burner fan (3) is controlled so that the room temperature can be maintained at the set temperature. Further, the room temperature (current temperature) and the set temperature (desired temperature) are displayed on the digital display section (36).

In addition, the microcomputer (25) is connected to the oil tank (9) (11) and the oil pan (8) (10) as shown in FIGS. 6 and 7.
) depending on the amount of oil in the fuel pump (13) and supply pump (1).
5) and the display section (35) are controlled as follows.

6th vl! As shown in J(a), when the fuel tank (9) m) is full, the oil in the right oil pan (8) flows into the fuel pump (1).
3) is supplied to the burner (4) to continue combustion. For this reason, the oil in the right oil tank (9) is drained from the right oil pan (8
), and the amount of oil in the right fuel tank (9) gradually decreases, until the amount of remaining oil in the right fuel tank (9) becomes small as shown in Figure 6(b). , residual oil switch (2
3) is turned on. At this time, the microcomputer (25) displays "Right" and "Right" in the message display section (37) of the display section (35).
The words "Refuel" will appear to indicate that the right fuel tank (9) is empty.

As shown in Figure 6 (C), the right oil pan (8) cannot be refilled with oil from the right oil tank (9), and the right oil pan (8)
When the oil level drops below L1, the reed switch (31A) of the right float switch (16) is turned on. At this time, the microcomputer (25) operates the supply pump (15) to supply the oil in the left oil pan (11) to the right oil pan (8).As a result, the oil level in the right oil pan (8) increases to L2. When the fuel rises above this level, the reed switch (31A) is turned off and the microcomputer (25) stops the supply pump (15).In this way, when the right fuel tank (9) is empty, as shown in Figure 7. The supply pump (15) operates intermittently depending on the oil level (oil amount) in the right oil pan (8), and the left oil pan (10)
) is transferred to the right oil pan (8). Further, the oil in the left oil tank (11) is replenished into the left oil pan (10), and the amount of oil in the left oil tank (11) gradually decreases. The supply pump (15) has an oil delivery capacity of 30 cc per minute, approximately 30 cc per minute.
The oil level in the right oil pan (8) should be reduced to Ll by running for seconds.
For this reason, the secondary supply pump (15) is operated at, for example, an oil fan heater with a maximum combustion amount of 3200 Kcal/h and a minimum combustion amount of 1100 Kcal/h. It will be in a minute.

As shown in Figure 6(d), oil is no longer supplied from the left oil tank (11) to the left oil pan (10), and oil is not supplied from the left oil pan (10) to the right oil pan (8). When the oil level in the left oil pan (10) drops below L3 due to the supply of oil, the reed switch (32) of the left float switch (17)
is turned off. At this time, the microcomputer (25) stops the supply pump (15), and the supply pump (electromagnetic pump) (
15) to prevent air from being sucked in, and the words "R-side", "Right side" and "Refueling" are highlighted on the message display section (37) of the display section (35),
It displays that both refueling tanks (9>(10) are empty, and also activates the buzzer (B) for a predetermined period of time to prompt refueling. Also, the microcomputer (25) responds to the amount of combustion at this time. Activate a built-in 15- to 20-minute timer (not shown).

If combustion continues without kerosene being replenished into the fuel tanks (9) and (10) in this condition, the microcomputer (25)
5 minutes before the timer counts up, the buzzer (B) is activated for a predetermined period of time to notify that combustion is about to stop.

Then, when the timer counts up, the microcontroller (
25) stops the fuel pump (13) to stop combustion and prevent air from being sucked into the fuel pump (electromagnetic pump) (13). In addition, the message display unit (37) flashes the words ``Left side'', ``Right side'', and ``Refueling'', and also activates the buzzer (B) to notify that combustion has stopped due to fuel exhaustion. In such a case, the right fuel tank (9) and/or the left fuel tank (1
If you replenish 1) with kerosene, it will become combustible.

In the unlikely event that the oil level in the right oil pan (8) becomes equal to or higher than L2 due to oil being supplied from the left oil pan (10) to the right oil pan (8),
If the reed switch (31A) is broken and does not turn off,
As shown in Fig. 7, the microcomputer (25) allows the built-in two-minute timer (T) to operate when the reed switch (31A) is turned on, and when the timer (r) counts up, the supply pump (15) ) to stop. In addition, even if the microcomputer (25) malfunctions and 2 minutes have passed, the supply pump (
15) cannot be stopped, the reed switch (31B) is turned on when the oil level in the right oil pan (8) reaches L4 or higher, as shown in Figure 6 (C), and the switching circuit (S) is turned on. to stop the supply pump (15).

According to this embodiment, the right oil pan (8) is provided on both sides of the burner (4).
) and the right oil tank (9), the left oil pan (10), and the left oil tank (11) are provided separately, and fuel is supplied from the right oil pan (8) to the burner (4) by the fuel pump (13). When the oil level in the right oil pan (8) drops to Ll and the oil level in the left oil pan (lO) is higher than L3, the oil in the left oil pan (10) is transferred to the right oil pan. Since the fuel is supplied to the saucer (8), combustion can be continued until both tanks (9) and (11) are empty, eliminating the hassle of frequent refueling and making it more convenient to use. Not, but
Even if the oil fan heater is installed at an angle,
There is no fear that oil in one oil pan will move to the other oil pan and cause an oil leak, and is highly safe. In addition, oil is used in the order of the right fuel tank (9) and the left fuel tank (11), and the presence or absence of oil in these tanks can be confirmed on the message display section (37).
You can select the refueling timing as appropriate while looking at the Furthermore, even if the reed switch (31A) as an oil level detection means fails to turn on, the timer (T) built into the microcomputer (25) counts up or the reed switch (31B> The supply pump (15) can be stopped when it is turned on, and there is no fear that the supply pump (15) will leak oil from the right oil pan (8).

In particular, the switching circuit (S) can stop the supply pump (15) even if the microcomputer (25) malfunctions, and the switching circuit (S) and the timer ('f)
It is highly reliable due to the combined use of

(G) Effects of the Invention As explained above, this invention supplies oil from a first oil pan to a combustion section among a plurality of separated oil pans and oil supply tanks, and increases the amount of oil in the second oil pan. Since oil is supplied from the second oil pan to the first oil pan when the oil decreases, combustion can be continued until multiple oil tanks are emptied one after another, reducing the frequency of refueling. This not only improves usability, but also prevents oil from moving from one oil pan to the other even if the equipment is installed at an angle, and even if there is a failure in the control device. This improves safety and reliability, as there is no need to worry about oil leaks.

Further, in the second claim, for example, a float switch (reed switch) can be used as the safety control means so that the oil amount detection means and the detection part can be shared, and in the third claim, the safety control means (for example, A timer) can be built into the microcontroller along with the pump control means, and by using these together, the supply pump can be stopped even in the event of a malfunction of the oil level detection means or the control means such as the microphone, resulting in high reliability. can be secured.

[Brief explanation of the drawing]

The figures relate to an embodiment in which the liquid fuel combustion device of the present invention is applied to a petroleum fan heater. Fig. 1 is a perspective view of the petroleum fan heater, Fig. 2 is an explanatory diagram of the internal structure, and Fig. 3 is a control device. Fig. 4 is an enlarged explanatory diagram of the display section, Fig. 5 is an explanatory diagram showing the relationship between temperature difference and combustion amount, and Fig. 6 is an explanatory diagram showing the relationship between temperature difference and combustion amount.
The diagram shows an oil pan. (4) Burner (combustion part), (8) Right oil pan, (9) Right oil tank, (10) Left oil pan, (11) Left oil supply Tank, (15)...
・Supply pump, (16)...Float switch (oil amount detection means), (25)...Microcomputer (pump control means), (S)...Switching circuit (safety control means), (T)... ...Timer (safety control means).

Claims (3)

[Claims] (1) A combustion part such as a burner, a first oil pan that stores oil to be supplied to the combustion part, a first oil supply tank that replenishes oil to this oil pan, a second oil pan, and A second oil supply tank supplies oil to the oil pan, and a second oil tank supplies oil to the second oil pan.
a supply pump for transferring the oil to the first oil receiver, an oil amount detection means for detecting the amount of oil in the first oil receiver, a pump control means for starting and stopping the supply pump in accordance with the output of the oil amount detection means; A liquid fuel combustion device characterized by comprising: safety control means for stopping a supply pump when the amount of oil in the oil pan increases abnormally. (2) The liquid fuel combustion apparatus according to claim 1, wherein the safety control means stops the supply pump when detecting an oil level higher than a pump stop control level by the pump control means. (3) The liquid fuel combustion apparatus according to claim 1, wherein the safety control means stops the supply pump when the operating time of the supply pump reaches a predetermined time.