JP3672511B2 - Electromagnetic plunger pump for liquid fuel supply - Google Patents

Description

つまり、Ｔｒ２がＯＮのときは、ＶＲ２が短絡されてＶＲ１で設定されたＶ１の出力電圧になり、Ｔｒ２がＯＦＦのときは、ＶＲ２が開放されてＶＲ１＋ＶＲ２で設定されたＶ２の出力電圧になる。
【００６６】
したがって、Ｔｒ２をパルス信号で断続的にＯＮ／ＯＦＦすると、Ｖ１からＶ２まで変化する断続電圧が出力される。そして電源Ｉｃへの入力電圧が停止されたら、出力は０Ｖになるのである。
【００６７】
Ｔｒ１は信号入力が停止されたときに、Ｔｒ２をＯＮにするためのトランジスタである。
【００６８】
Ｄ1 ，Ｄ２は電源Ｉｃの保護用ダイオード、Ｃ１，Ｃ３は電源Ｉｃ発振防止用コンデンサ、Ｃ２は設定電圧安定用のコンデンサ、Ｄ３は電磁コイルの逆起電力から電源Ｉｃを保護するためのダイオード、Ｒ１、Ｒ２はＴｒ１，Ｔｒ２の電流制限抵抗である。
【００６９】
制御の方法としては、先ずＶｃｃに所定の電圧を印加する。
ＳＧに駆動パルス信号が印加されていない状態では、Ｔｒ２はＯＮの状態であり、ＶＲ２が短絡されるので、電源ＩｃのＡＤＪ端子とＧＮＤ端子間にはＶＲ１のみの抵抗が接続された状態になり、先に示した、出力電圧調整用抵抗と出力電圧の関係式の通り出力電圧は低い電圧になる。その状態で、ポンプのプランジャが静止位置より僅かに離れるように、ＶＲ１でＶ１を調整する。
【００７０】
次に、ＳＧに駆動パルス信号を印加すると、信号がＯＮのときには、Ｔｒ２がＯＦＦになり、電源ＩｃのＡＤＪ端子とＧＮＤ端子間には、ＶＲ１とＶＲ２が直列に接続された状態になり、出力電圧は高い電圧になる。その状態で、信号がＯＮのときの電圧Ｖ２をポンプの吐出量が、所定の量になるようにＶＲ２で調整する。
【００７１】
ＳＧに所定の周期と所定の通電時間をもつ断続パルスを印加すると、ポンプのコイルには、Ｖ１からＶ２まで変化する駆動電圧が印加され、ポンプは通常のポンプ動作を行い、燃料を吸入し、吐出する。
【００７２】
消臭動作を行う際には、先ずＳＧへの駆動パルスの信号を停止する。信号を停止すると、Ｔｒ２がＯＮになり、ＶＲ２が短絡され、電源Ｉｃの出力電圧はＶ１になる。
【００７３】
コイルには、Ｖ１の電圧だけが印加され、プランジャはあらかじめ設定された、静止位置より僅かに離れた位置に保持されて、上流側の流路が開通され、下流側の燃料が逆流する。その後、所定の量が逆流した後、電源Ｉｃへの電圧供給を停止すると、プランジャは静止位置に戻り、上流側の流路が閉塞される。
【００７４】
制御回路にＤ／Ａコンバータを使用して、マイコン制御する方法もある。
【００７５】
図５に示す電圧波形を出力できるものなら、どのような回路でもよい。
【００７６】
【発明の効果】
以上詳述したように、本発明の液体燃料供給用電磁プランジャポンプは、特に従来技術の問題点を解決する課題の欄と実施の形態の欄において述べた理由により、以下のような効果が得られる。
【００７７】
ａ）流路の閉止と開放を電磁プランジャで直接行うので、制御が簡単である。
【００７８】
ｂ）構造が簡単で組み立て易く、コストが安くできる。
【００７９】
ｃ）流路を閉止するカット弁の押さえばねの荷重を大きくできるので、閉止能力を高めることができる。
【００８０】
ｄ）消臭動作時に、プランジャを引き上げる必要がなく（パルス信号が停止して、保持電圧になった時点で流路が開放になる）、消臭動作初期の吐き出しが無く、高い消臭効果が得られる。
【００８１】
ｅ）ポンプ動作（プランジャの上下運動により、流体を吸入して吐出する）を終了した直後から均一な戻り量が得られるので、高い消臭効果が得られる。
【００８２】
ｆ）消臭動作が、一定の電圧Ｖ１と一定の保持時間だけで制御できるので、制御回路が簡単で制御シーケンスも簡単である。
【００８３】
ｇ）ポンプが停止状態（コイルの印加電圧が無い状態）のときは、カット弁で洩れを確実に止めることができるので、着火時の白煙や、異臭の発生がない。
【図面の簡単な説明】
【図１】本発明の液体燃料供給用電磁プランジャポンプの一実施の形態の一部断面を表した縦断説明図である。
【図２】従来の電磁プランジャポンプの一部断面を表す縦断説明図である。
【図３】さらに他の従来の電磁プランジャポンプの一部断面を表す縦断説明図である。
【図４】図２に示す従来技術の電磁プランジャポンプの電磁プランジャの作動を表した線図であり、横軸に時間、縦軸に行程長を表している。
【図５】図１の本発明の実施の形態の電磁プランジャポンプの電磁コイルに印加する電圧部付勢電流の波形図を示すもので、横軸に時間、縦軸に電圧をとる。
【図６】図１の本発明の一実施の形態の電磁プランジャポンプのポンプ作用時と燃焼停止の消火時の消臭作動時の電磁プランジャの動作を示す線図（チャート図）で横軸に時間を、そして縦軸に電磁プランジャの作動状態をとる。
【図７】本発明の電磁プランジャポンプの制御回路図である。
【図８】本発明の電磁プランジャポンプのさらに他の制御回路図を示すものである。
【符号の説明】
１ 吐出側接手
３ 吐出逆止弁
４ 吐出弁シート
７ 電磁コイル
８ ばね
９ 管柱
１０ 電磁プランジャ
１４ 吸入逆止弁
１５ カット弁
１６ カット弁シート
１７ 吸入側接手[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic plunger pump for supplying liquid fuel to a combustion apparatus, particularly an oil hot air heater such as an oil fan heater, an oil water heater, and the like, and an odor due to unburned fuel during extinguishing in these combustion apparatuses In order to prevent generation and tar burn, the deodorizing action of returning the fuel remaining in the fuel passage from the discharge side to the nozzle of the fuel oil supply electromagnetic plunger pump at the time of digestion to the suction side and collecting the pump when restarting combustion Upstream of the discharge valve and intake side piping, fuel discharge turbulence due to the so-called air biting phenomenon due to the mixing of air replaced with fuel oil, generation of incomplete combustion gas due to air-fuel ratio fluctuation, and fire from the louver of the combustor In order to prevent dangerous disasters such as droughts, the return amount for backflow recovery of unburned fuel to the fuel tank side during the digestion is limited, and it will remain almost in the pump body. To a method of controlling leakage reverse flow from the discharge valve.
[0002]
[Prior art]
The oil vaporization type combustion apparatus used for the fan heaters and hot water heaters of the above-mentioned small heaters for home and business use is disclosed in Japanese Patent Laid-Open No. Sho 60-93184 and Japanese Patent No. 2601592. The fuel oil sent by the pump is discharged from the nozzle into the vaporization chamber equipped with the electric heater, and at the same time, the fuel oil is atomized by jetting air from the air supply nozzle surrounding the nozzle, and further vaporized, Known so-called air jet burners, Bunsen burners, rotary burners, pot burners, and the like are known.
[0003]
In such an oil vaporization type burner, during the digestion, a part of unburned oil from the discharge valve of the pump to the nozzle via the discharge side piping expands and is prevented from being discharged from this nozzle and generating the odor or the like. For this purpose, various prior arts have been proposed.
[0004]
That is, in the prior art described in Japanese Patent No. 2698018, a thrust member is provided on the top of the plunger of the electromagnetic pump, and the discharge check valve is pushed up at the time of extinguishing the fire so that unburned fuel downstream of the discharge side including the discharge side piping is removed. Regulates the opening period for backflow.
[0005]
FIG. 2 is a longitudinal sectional view showing a partial cross section of this protruding member, that is, a push rod type conventional electromagnetic plunger pump.
[0006]
According to this, the thrust member (push rod) 109 is fixed to the upper end of the electromagnetic plunger 111, and the intermittent pulse current for pumping the electromagnetic coil 107 when the combustion is stopped is cut off, and the thrust member 109 is provided with an opening means for the discharge valve 104 for moving the electromagnetic plunger 111 beyond the dead point only for a predetermined period equal to or greater than the pulse width of the intermittent pulse current. In other words, in the case of this patent technology, the opening means is an electromagnetic The coil 107 is energized with an electric current that can cause the electromagnetic plunger 111 to move upward beyond the top dead center, thereby slowly pulling the electromagnetic plunger 111 upward, and the thrust member 109 pushes the discharge valve 104 open, downstream. The unburned fuel is allowed to flow upstream for the predetermined period to contribute to the deodorizing action.
[0007]
FIG. 4 shows the operation of the electromagnetic plunger 111 of this type, and the stroke length is from 0 point to P2 during the normal pump action for sucking and discharging fuel by the reciprocating motion. The position where the electromagnetic plunger 111 starts to push up the discharge valve 104 for the deodorizing action is approximately the intermediate point P3 between P1 and P2.
[0008]
In order to perform the deodorizing action, the upper end of the electromagnetic plunger 111 is moved up to the position P1 beyond the position P3 where the discharge valve 104 is pushed open and held at that position, and the predetermined unburned fuel flows backward. The energizing current to the electromagnetic coil 107 is turned off. In this case, when the discharge stroke of the electromagnetic plunger 111, depending on the flow pressure resistance of the liquid, the negative pressure on the suction side, and the period of the intermittent pulse current, there is no time margin to sufficiently extend the discharge stroke length of the electromagnetic plunger 111, Therefore, it is a common practice for this type of free piston type electromagnetic pump that the top dead center of the stroke shifts to the suction side and repeats the reciprocating motion, and this is as described in the above-mentioned known prior art document. is there. For this reason, at the time of the pump action for energizing the intermittent pulse current to the electromagnetic coil 107, the thrust member does not push up and knock the discharge valve, and therefore there is no possibility of damage or noise generation.
[0009]
Therefore, when the deodorizing operation is performed, it is necessary to pull up the plunger from the position of the zero point to P1 beyond the maximum position P2 where the normal pumping operation is performed. Extrudes the fuel and once digested, the fuel drops to the vaporization part of the burner and a large amount of unburned gas is generated.
[0010]
Therefore, it is necessary to slowly pull up the plunger from T to S.
[0011]
Next, the prior art disclosed in Japanese Patent Nos. 2601592 and 2959883 discloses that the discharge valve is made of a magnetic material, and the discharge valve is opened by electromagnetic force during digestion to recover the unburned fuel back to the suction side. Is.
[0012]
FIG. 3 is a longitudinal sectional view showing a partial cross section of the magnet valve type deodorizing electromagnetic plunger pump according to the prior art. A magnet valve 207 as a discharge valve is made of a magnetic material, and is surrounded by a magnetic valve 207. An SV upper magnetic path 203, an SV core 204, an SV lower magnetic path 208, and a dedicated subcoil 206 for a solenoid valve are provided.
[0013]
In the deodorizing operation during digestion, when the intermittent pulse current for pump operation is turned off and a voltage is applied to the subcoil 206, the magnet valve 207 is lifted upward to open the valve, and the downstream non-destructive current is opened. The fuel is returned back upstream.
[0014]
This method is easy to control the current and does not discharge by deviating movement of the electromagnetic plunger for deodorizing operation, but has a drawback that the configuration and circuit configuration of the pump are complicated and the cost is increased.
[0015]
As described above, the configuration, operation, and the like of the conventional technology shown in FIGS.
[0016]
On the other hand, at the time of ignition, it is necessary to shorten the time from the start of the pump to the ignition in order to eliminate white smoke and off-flavor at the time of ignition.
[0017]
Conventional pumps are: Although the valve mechanism on the discharge side has a function to prevent reverse flow when stopped, the load on the discharge spring of the discharge valve needs to be as weak as possible in order to ensure the stability of the flow rate. The function of preventing the deterioration is lowered, and if left for a long time, there is a problem that the fuel in the pipe is lost and the ignitability is deteriorated.
[0018]
[Problems to be solved by the invention]
In view of the above-mentioned problems and disadvantages of the prior art, the present inventors have solved these problems and further pursued inventive step and novelty with respect to the following points.
[0019]
1) When the discharge valve is stationary, that is, with the pump operation paused, there is a slight gap between the valve seats to allow fluid leakage from downstream to upstream, and after completion of the pump operation after combustion stop, As a configuration in which the cut valve provided on the suction side of the electromagnetic plunger is closed after a certain period of time, the deodorizing function during fire extinguishing can be controlled.
[0020]
2) A constant voltage that slightly raises the drive voltage of the cut valve in advance from the electromagnetic plunger stationary position is applied in advance, and an intermittent pulse current that causes the electromagnetic plunger to reciprocate based on that voltage is superimposed.
[0021]
3) The deodorizing operation is simple so that it can be controlled only at a constant voltage V1 and a predetermined holding time.
[0022]
4) A uniform back flow amount of fuel oil is obtained immediately after the stop of combustion in which the pumping action is stopped by the reciprocating motion of the electromagnetic plunger and the discharge of fuel is stopped.
[0023]
5) After the operation of the electromagnetic plunger of the pump is stopped, the backflow leakage from downstream to upstream is completely blocked by the cut valve.
[0024]
Satisfying the above requirements,
B) A deodorizing operation before and after the combustion action can be performed without using a protrusion member or a magnetic magnet valve.
[0025]
B) Since there is no need to pull up the plunger during the deodorizing operation, there is no fuel discharge in the initial stage of the deodorizing operation.
[0026]
C) When the electromagnetic plunger is stopped, the cut valve presses and closes the valve seat, so the dimension of the magnetic gap between the other end and the lower end surface of the discharge side joint made of a magnetic material can be easily managed to a predetermined value. There is little variation when the pump is assembled, and therefore it is easy to manage the magnetic attraction force that is inversely proportional to the square of the magnetic gap, that is, the discharge capacity of the pump.
[0027]
[Means for Solving the Problems]
In order to solve the above-described problems of the prior art in the present invention, an electromagnetic plunger pump for liquid fuel supply according to the present invention includes:
Fitted from the fuel tank to the combustor via the flow path to the combustor, it is slidably fitted in a cylinder column inserted into the axial center hole of the electromagnetic coil of the pump, and an intake check valve is installed. provided and the electromagnetic plunger cut valve on the end portion is formed, a cut valve seat with the suction side main portion of the pump pushing closable to the cut valve, urged by the repulsive force of the spring for the return from the other end The electromagnetic plunger applies a constant voltage to the electromagnetic coil in order to keep the cut valve slightly open against the repulsive force of the spring during the operation of the pump and at a predetermined time after the combustion of the combustor is stopped. applied to, during combustion continuing pumping action, the electromagnetic plunger pump for liquid fuel supply that will be reciprocated by a biasing intermittent pulse current is superimposed on the voltage and current, at the time of pumping action stop of the combustion stop, the discharge of the pump Including side In order to leak back flow unburned fuel oil from the downstream side to the upstream of the suction side, hinge effects capable disposed and having pump operation to pivot at one end to the discharge side main portion downstream of said tube pillars At least this combination of a reed valve-type discharge check valve that can be closed by receiving high pressure on the discharge side and a discharge valve seat that engages with it, creates a small gap when the pump action stops. A leakage means is provided.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0029]
FIG. 1 is a longitudinal sectional view showing a partial cross section of an electromagnetic plunger pump for supplying liquid fuel according to the present invention. An electromagnetic plunger pump that supplies fuel oil from a fuel tank (not shown) to the combustor through a flow path such as a pipe, which prevents the generation of malodors such as unburned gas when extinguishing the combustion of the combustor. is there. The electromagnetic plunger 10 has a suction check valve 14 which is slidably reciprocated in a cylinder column 9 inserted in the axial center through hole of the electromagnetic coil 7 of the pump and has a plate valve. ing. The electromagnetic plunger 10 has a cut valve 15 formed at its end so that the cut valve seat 16 provided in the suction joint 17 on the suction side of the pump can be pressed and closed. It is energized by repulsive force.
[0030]
On both upper and lower ends of the electromagnetic coil 7, a discharge joint 1 and a magnetic iron plate 12 that are externally fitted to the pipe column 9 and are made of a magnetic material are disposed, respectively, and the discharge side of the tube column 9 is connected to the discharge joint 1. The suction side is connected to a suction side joint 17. The discharge joint 1 and the magnetic iron plate 12 are clamped and fixed by screwing an outer flange 6 of the outer frame yoke together with the electromagnetic coil 7 to the suction joint 17. A plate-like plate valve-like discharge check valve 3 made of, for example, a flexible synthetic rubber, disposed in the discharge-side main portion downstream of the pipe column 9, and a discharge valve seat engaged therewith 4, and a packing 5 is interposed between the upper portion of the tube pillar 9 to keep watertight. On the other hand, the O-ring 13 keeps airtight and watertight at the connection portion of the suction side joint 17 of the tube column 9.
[0031]
The plate valves of the check valves 3 and 14 are fixed at their ends by a discharge valve seat 4 and a discharge valve cylinder 2, and a cut valve 15 and an intake valve cylinder 11, respectively. There is also a small gap between them.
[0032]
Each of these plate valves 3 and 14 is capable of hinge-like operation in which a fixed end is hinged.
[0033]
The plate valves 3 and 14 are, as described above, lead valves made of a flexible plate-like material, each having a valve seat and a slight gap, and the pressure on the discharge side is particularly reduced when the pump action is stopped. Thus, the clearance is opened and the unburned fuel on the discharge side leaks and flows backward to the suction side. Therefore, the slight clearance may be provided on the valve seat side.
[0034]
Further, when the flexible plate valve is made of an elastic hard material, the valve seat may be made of a flexible material.
[0035]
In addition, the slight gap may be formed by engraving a groove in the valve seat or by preliminarily placing the surface roughness of the contact surface with the valve seat of the discharge and / or suction side check valve. These are disclosed in JP-A-60-93184, JP-A-5-31272, and JP-A-5135135.
[0036]
The cut valve has a smooth lower end and is pressed against the cut valve seat 16 by the spring 8 when the pump is stationary, thereby closing the suction-side flow path.
[0037]
There is a very small gap between the tube pillar 9 and the electromagnetic plunger 10 fitted thereto, and unburned fuel on the discharge side is discharged from the gap when the pump is stationary. Since the leakage backflow can be performed on the suction side, the small clearance on the suction check valve 14 side may not be provided. However, the above slight clearance on the discharge check valve 3 side is necessary.
[0038]
The discharge side joint 1 made of the magnetic material forms an annular magnetic pole and has a magnetic gap between the lower end surface thereof and the upper end surface of the electromagnetic plunger 10, and a magnetic circuit is formed by the outer casing 6 and the magnetic iron plate 12. Is configured.
[0039]
When the electromagnetic coil 7 is energized, the electromagnetic plunger 10 moves upward by the magnetic force generated in the magnetic circuit, and the cut valve 15 moves away from the cut valve seat 16 to open the suction-side flow path. When the current is cut off, the old state is restored by the repulsive force of the spring 8.
[0040]
When the intermittent pulse current is applied to the electromagnetic coil 7 by applying the constant voltage, that is, superposed on the constant current, the electromagnetic plunger 10 first opens the cut valve, and then reciprocates in the pipe column, so that the suction check valve The fluid that passes through the strainer 18 of the suction side joint 17 is discharged from the discharge side joint 1 through the inside of the pump in cooperation with the pump 14 and the discharge check valve 3. When the energizing current to the electromagnetic coil 7 is cut off, the electromagnetic plunger 10 moves downward by the repulsive force of the spring 8, and the cut valve 15 closes the cut valve seat 16, and again shuts off the suction side flow path. is there.
[0041]
In the deodorizing operation, current is applied to the electromagnetic coil 7 so that the electromagnetic plunger 10 can be slightly separated from the cut valve seat 16, and the cut valve 15 holds the cut valve seat 16 at the opened position. As a result, the unburnt fuel on the downstream side leaks back to the upstream side and is collected through the small gap of the discharge check valve 3 and the suction check valve 14 and the gap between the pipe column 9 and the electromagnetic plunger 10. When the current is turned off after a predetermined amount of time for backflow has elapsed, the cut valve 15 shuts off the cut valve seat 16 and stops the backflow.
[0042]
Here, applying a constant voltage to the electromagnetic coil 7, that is, energizing a predetermined current, is as if the electromagnetic plunger 10 is magnetically attracted by a magnetic attractive force toward the annular magnetic pole of the upper discharge joint 1 in the figure. When trying to move so as to fill, a so-called solenoid attractive force generated in the electromagnetic coil is also applied at the same time.
[0043]
Since this solenoid attraction is described in detail in Japanese Patent Publication No. 57-12863 previously proposed by the applicants of the present application, the description thereof will be omitted.
[0044]
Of course, the gap attractive force and the solenoid attractive force are also acted on by the intermittent pulse current that is energized superposed on the predetermined current.
[0045]
Thus, energizing the predetermined current not only keeps the flow path open by using the cut valve 15 but also pushes and holds the electromagnetic plunger 10 toward the discharge joint 1. This also serves as a lower spring or auxiliary spring provided in the electromagnetic plunger pump, so that so-called overshoot due to inertia during the double stroke of the electromagnetic plunger 10 is prevented from being buffered, thus preventing impact on the cut valve seat 16 and noise. In addition, since the damage is prevented, there is an effect of increasing durability.
[0046]
At the end of the pump action after stopping the combustion, there is a slight difference in the amount of residual unburned fuel depending on the pipe diameter and length of the pipe including the nozzle on the discharge side of the pump, but it is several milliliters, Even if the residual unburned fuel absorbs and expands the ambient temperature such as radiant heat and the temperature rise of the electromagnetic coil 7, the amount of liquid downstream from the cut valve 15 is also leaked back to the suction side and collected. However, since the time required for this is about several tens of seconds, this time may be set so as to cut off the constant voltage to the prospective electromagnetic coil 7, that is, the base current. Of course, in this case, it is a condition that the liquid level of the fuel tank is below the installation position of the pump.
[0047]
A voltage waveform applied to the electromagnetic coil 7 of the electromagnetic pump according to the embodiment shown in FIG. 1 of the present invention will be described below with reference to FIGS.
[0048]
In FIG. 5, when the voltage V1 is applied, the voltage V1 is adjusted so that the electromagnetic plunger 10 of the pump is slightly lifted from the rest position.
[0049]
Further, when a continuous pulse period (1 / f) and energization time (ON / T) for generating a voltage from V1 to V2 is applied, the pump is adjusted to discharge a predetermined amount. When such a voltage is applied to the electromagnetic coil 7 of the pump, the plunger of the pump operates as shown in FIG. That is, when the voltage becomes V1, the plunger is pulled up from the 0 point to the position of P1.
[0050]
Thereafter, when the voltage rises from V1 to V2, the plunger is pulled up from P1 to P2. And if a voltage falls from V2 to V1, a plunger will return to the position of P1.
[0051]
As described above, when the continuous pulse voltage is applied, the plunger repeats the vertical movement from P1 to P2, and sucks and discharges the fuel in the pump structure described above.
[0052]
When performing the deodorizing operation, only the pulse voltage is stopped at time T in FIG. Then, the magnetic force generated by the voltage V1 is applied to the plunger, and the plunger stops at the position P1. Position of P1, since the plunger is separated slightly from the rest position (the position blocking the flow path), the channel has become an open, fuel under flow back to top stream.
[0053]
Next, when the voltage V1 is turned off after a predetermined time has elapsed, the plunger returns to the 0 point in FIG. 4, the plunger closes the flow path, and the return of fuel stops. In this way, the return amount per time can be controlled by the voltage of V1, and the return time can be controlled by the holding time CT of V1.
[0054]
Next, a control circuit according to an embodiment of the present invention will be described with reference to FIG. In FIG.
This is an embodiment of a control circuit using a variable power supply and a drive transistor, and the variable power supply is a circuit that generates a voltage V1 that holds the plunger during the deodorizing operation at the position P1 in FIG.
[0055]
Tr is a circuit that generates a pulse voltage from V1 to V2 and moves the plunger of the pump up and down when a pulse signal is input to SG.
[0056]
D1 and D2 are rectifying elements for synthesizing the voltages V1 and V2.
[0057]
D3 is a flywheel diode that prevents the electronic component from being damaged by the back electromotive force generated from the coil of the pump.
[0058]
As a control method, first, the variable power source is operated, and the voltage V1 is applied to the coil. Next, when a drive pulse signal is applied to the SG of Tr, the pump performs a normal pump operation to absorb and discharge the fuel.
[0059]
In the deodorizing operation, first, the signal of the drive pulse to the SG of Tr is stopped. If you stop the signal, the voltage of V1 supplied from the variable power supply is applied to the coil, the plunger will stop slightly away from the rest position, in a state where the flow path of the upper stream side is opened now, back to the top flow fuel of lower flow. When the predetermined amount returns, when the output of the variable power supply is stopped, the plunger returns to the stationary position and the flow path is closed.
[0060]
Next, another embodiment of the control circuit will be described.
[0061]
This is a control circuit using a variable output type voltage stabilization power supply IC.
[0062]
The power supply IC is a three-terminal variable output voltage stabilization power supply circuit, and the output voltage can be varied by distributing resistance values connected to the ADJ terminal side and the GND terminal side, and the ADJ terminal side and the OUTPUT terminal side.
[0063]
In the embodiment, a fixed resistor R3 is connected to the ADJ terminal side and the OUTPUT terminal side, two variable resistors VR1 and VR2 are connected in series to the ADJ terminal side and the GND terminal side, and one of the variable resistors VR2 is connected. Tr2 is connected in parallel, and Tr2 is ON / OFF controlled to generate output voltages V1 and V2.
[0064]
The relationship between the output voltage adjusting resistors R3, VR1, VR2 and the output voltage of the power supply Ic is as follows.
[0065]

That is, when Tr2 is ON, VR2 is short-circuited and becomes an output voltage of V1 set by VR1, and when Tr2 is OFF, VR2 is released and becomes an output voltage of V2 set by VR1 + VR2.
[0066]
Therefore, when Tr2 is intermittently turned on / off with a pulse signal, an intermittent voltage changing from V1 to V2 is output. When the input voltage to the power source Ic is stopped, the output becomes 0V.
[0067]
Tr1 is a transistor for turning on Tr2 when signal input is stopped.
[0068]
D1 and D2 are protection diodes for the power supply Ic, C1 and C3 are power supply Ic oscillation prevention capacitors, C2 is a capacitor for stabilizing the set voltage, D3 is a diode for protecting the power supply Ic from the back electromotive force of the electromagnetic coil, R1 , R2 are current limiting resistors Tr1 and Tr2.
[0069]
As a control method, first, a predetermined voltage is applied to Vcc.
When no drive pulse signal is applied to SG, Tr2 is ON and VR2 is short-circuited. Therefore, only the resistor VR1 is connected between the ADJ terminal and the GND terminal of the power supply Ic. The output voltage is a low voltage as shown in the relational expression between the output voltage adjusting resistor and the output voltage. In this state, VR1 is adjusted with VR1 so that the plunger of the pump is slightly separated from the rest position.
[0070]
Next, when a drive pulse signal is applied to SG, Tr2 is turned OFF when the signal is ON, and VR1 and VR2 are connected in series between the ADJ terminal and the GND terminal of the power supply Ic, and output The voltage is high. In this state, the voltage V2 when the signal is ON is adjusted by VR2 so that the pump discharge amount becomes a predetermined amount.
[0071]
When an intermittent pulse having a predetermined period and a predetermined energization time is applied to SG, a driving voltage that changes from V1 to V2 is applied to the coil of the pump, the pump performs a normal pump operation, sucks fuel, Discharge.
[0072]
When performing the deodorizing operation, first, the signal of the drive pulse to SG is stopped. When the signal is stopped, Tr2 is turned ON, VR2 is short-circuited, and the output voltage of the power supply Ic becomes V1.
[0073]
Only the voltage V1 is applied to the coil, the plunger is held at a preset position slightly away from the stationary position, the upstream flow path is opened, and the downstream fuel flows backward. Thereafter, after the predetermined amount has flowed backward, when the voltage supply to the power source Ic is stopped, the plunger returns to the stationary position and the upstream flow path is closed.
[0074]
There is also a method of controlling the microcomputer using a D / A converter in the control circuit.
[0075]
Any circuit that can output the voltage waveform shown in FIG. 5 may be used.
[0076]
【The invention's effect】
As described above in detail, the electromagnetic plunger pump for supplying liquid fuel according to the present invention has the following effects, particularly for the reasons described in the column of the problem to solve the problems of the prior art and the column of the embodiment. It is done.
[0077]
a) Since the flow path is closed and opened directly by the electromagnetic plunger, the control is simple.
[0078]
b) The structure is simple and easy to assemble, and the cost can be reduced.
[0079]
c) Since the load of the pressing spring of the cut valve for closing the flow path can be increased, the closing ability can be enhanced.
[0080]
d) During the deodorizing operation, it is not necessary to pull up the plunger (the flow path is opened when the pulse signal stops and reaches the holding voltage), there is no discharge at the initial stage of the deodorizing operation, and a high deodorizing effect is achieved. can get.
[0081]
e) Since a uniform return amount can be obtained immediately after the pump operation (fluid is sucked and discharged by the vertical movement of the plunger), a high deodorizing effect can be obtained.
[0082]
f) Since the deodorizing operation can be controlled only by the constant voltage V1 and the constant holding time, the control circuit is simple and the control sequence is also simple.
[0083]
g) When the pump is in a stopped state (the state where there is no applied voltage to the coil), the leakage can be reliably stopped by the cut valve, so there is no generation of white smoke or a strange odor during ignition.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a partial cross section of an embodiment of an electromagnetic plunger pump for supplying liquid fuel according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view showing a partial cross section of a conventional electromagnetic plunger pump.
FIG. 3 is a longitudinal sectional view showing a partial cross section of still another conventional electromagnetic plunger pump.
4 is a diagram showing the operation of the electromagnetic plunger of the conventional electromagnetic plunger pump shown in FIG. 2, with the horizontal axis representing time and the vertical axis representing stroke length.
FIG. 5 is a waveform diagram of a voltage portion energizing current applied to the electromagnetic coil of the electromagnetic plunger pump according to the embodiment of the present invention shown in FIG. 1, with the horizontal axis representing time and the vertical axis representing voltage.
6 is a diagram (chart diagram) illustrating the operation of the electromagnetic plunger during the deodorizing operation when the electromagnetic plunger pump of the embodiment of the present invention of FIG. Time is taken and the operating state of the electromagnetic plunger is taken on the vertical axis.
FIG. 7 is a control circuit diagram of the electromagnetic plunger pump of the present invention.
FIG. 8 shows still another control circuit diagram of the electromagnetic plunger pump of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Discharge side joint 3 Discharge check valve 4 Discharge valve seat 7 Electromagnetic coil 8 Spring 9 Pipe pillar 10 Electromagnetic plunger 14 Suction check valve 15 Cut valve 16 Cut valve seat 17 Suction side joint

Claims (1)

Fitted from the fuel tank to the combustor via the flow path to the combustor, it is slidably fitted in a cylinder column inserted into the axial center hole of the electromagnetic coil of the pump, and an intake check valve is installed. provided and the electromagnetic plunger cut valve on the end portion is formed, a cut valve seat with the suction side main portion of the pump pushing closable to the cut valve, urged by the repulsive force of the spring for the return from the other end The electromagnetic plunger applies a constant voltage to the electromagnetic coil in order to keep the cut valve slightly open against the repulsive force of the spring during the operation of the pump and at a predetermined time after the combustion of the combustor is stopped. applied to, during combustion continuing pumping action, the electromagnetic plunger pump for liquid fuel supply that will be reciprocated by a biasing intermittent pulse current is superimposed on the voltage and current, at the time of pumping action stop of the combustion stop, the discharge of the pump Including side In order to leak back flow unburned fuel oil from the downstream side to the upstream of the suction side, hinge effects capable disposed and having pump operation to pivot at one end to the discharge side main portion downstream of said tube pillars At least this combination of a reed valve-type discharge check valve that can be closed by receiving high pressure on the discharge side and a discharge valve seat that engages with it, creates a small gap when the pump action stops. An electromagnetic plunger pump for supplying liquid fuel, characterized in that a leakage means is provided.

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