JP3392786B2 - Electromagnetic planer pump - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positive displacement electromagnetic plunger pump for liquids, for example, for supplying fuel oil to a combustion device such as a gun type oil burner or supplying water liquid to a cleaning device under pressure.

[0002]

2. Description of the Related Art A general construction of an electromagnetic plunger pump of this type is an electromagnetic plunger which is slidable and reciprocable in a cylindrical cylinder inserted in a longitudinal through hole of an electromagnetic coil for energizing an intermittent pulse current. , A discharge plunger that slides back and forth in tandem in a cylinder and reciprocates in the cylinder is balancedly sandwiched between two springs that work from opposite directions, and when a current is applied to the electromagnetic coil, Due to the intermittent magnetic attraction force generated there and the repulsive force of one of the two springs, the two plungers reciprocate to open and close the intake and discharge both valves communicating with the cylinder. Together with this, a so-called in-line positive displacement type electromagnetic plunger pump in which liquid is sucked through the suction port, vertically penetrates inside the pump, and is discharged through the discharge port is mainly used.

Several technical examples of the articulating means of the electromagnetic plunger and the discharge plunger interlocking with the electromagnetic plunger in these prior arts will be described below.

First, in the prior art disclosed in Japanese Patent Laid-Open No. 9-222074, as shown in FIG. 7 of the present application, a tube column cylinder 14 "(the above-mentioned special feature is formed in a through hole formed through the center of a bobbin of an electromagnetic coil). The main body 25 ″ (pump main body 10) is erected coaxially with the electromagnetic plunger 11 ″ (electromagnetic plunger 15), which slides and reciprocates on the guide pipe 5) <hereinafter the same> described in the specification of Kaihei 9-222074. The electromagnetic plunger 11 "is attached to the cylinder 15" (cylinder 24).
A return spring 16 ″ is provided with a discharge plunger 13 ″ (piston 21) coaxially coupled and fixed to the (electromagnetic plunger 15) so as to be slidable, and to balance and support the electromagnetic plunger 11 ″ from mutually opposite directions. It is sandwiched between the (upper spring 16) and the auxiliary spring 17 ″ (lower spring 17).

Furthermore, in addition to the prior art, patent No. 2,65
The one disclosed in FIGS. 9 and 1 of JP-A-6,663 and shown in FIGS. 5 and 6 of the present application is the same as the electromagnetic plunger 11 ′ which is slidably and reciprocally fitted in the tube column cylinder 14 ′. A discharge plunger 13 'slidably and reciprocally slidable in a cylinder 15' provided on an extension of the axis and a contact ring 47 having a tappet portion 46 provided at its end or a flow port 48.
Abutting against each other via the return spring 16 'and the auxiliary spring 1
It is sandwiched between 7'and 7'and is supported by the repulsive force of the springs in opposite directions.

Japanese Patent Laid-Open No. 9-222074 of the above-mentioned prior art example
No. 2,656,663, the electromagnetic coil according to the correlation positional relationship between the electromagnetic plunger and the electromagnetic coil and the relative position of the magnetic gap between the electromagnetic plunger and the magnetic head or the annular magnetic pole. In the figure, the direction in which the electromagnetic plunger is attracted and moved by the magnetic attraction force generated when the current is energized is upward in the figure and downward in the latter. Therefore, the upper and lower positions of the return springs 16 ', 16 "and the auxiliary springs 17', 17" are upside down as shown in FIGS. 5, 6 and 7. The numbers of other symbols are the same as those in FIGS. 1 and 2 described later, and the names are also the same.

[0007]

[0007] As shown in FIG. 7, due to the prior art disclosed in Japanese Patent Laid-Open No. 9-222074, the electromagnetic plunger 11 "discharge into holes bored on the axis of the plunger 13" Are fitted and fixed, and the electromagnetic plunger 11 "slides and reciprocates in the tube cylinder 14" and the discharge plunger 13 "slides and reciprocates in the cylinder 15", so that they are eccentric and bent relative to each other. Is extremely forbidden because it seriously hinders its operation, so that the electromagnetic plunger 11 ″, the discharge plunger 13 ″, the tube cylinder 14 ″, the cylinder 15 ″, the main body 2 should be kept free of madness.
It is necessary to improve the accuracy of the machining work of the mounting part of 5 ″, and the seat bending of the return spring 16 ″ and the auxiliary spring 17 ″ is also the electromagnetic plunger 11 ″ and the discharge plunger 13 ″, which are the tube cylinder 14 ″ and the cylinder. Side pressure is generated within 15 ", which increases the sliding friction resistance, hinders the operation of the pump and causes wear. Therefore, not only the cost for taking measures to prevent them but also the cost increase. Moreover, there is a possibility that the above-mentioned trouble or operation lock may suddenly occur during use in the market, which is a serious problem.

Further, the patent No. 2,65 shown in FIGS.
In the prior art disclosed in Japanese Patent No. 6,663, the electromagnetic plunger 11 ′ and the discharge plunger 13 ′ are in contact with each other via the tappet portion 46 or the contact rig 47 so as to articulate with each other ( Although there is no fear of being affected by trembling, there is a free pressure supported by springs from both sides due to fluctuations in flow resistance, such as when bubbles in the liquid pass through the cylinder 15 'and tube cylinder 14' in a separated manner. Since it is a piston pump, there is a problem that the stroke length of the electromagnetic plunger 11 'and the discharge plunger 13' is rapidly increased, and noise is generated due to chattering between them. The presence of the abutment ring 47 further exacerbates this concern.

Further, as is apparent from the drawings, the conventional art has its length increased by the connecting means of the electromagnetic plunger and the discharge plunger, and the height of the pump itself is also increased. There is no need to meet the needs of the market, where manufacturers of petroleum combustion equipment equipped with an electromagnetic pump for supplying fuel oil and sanitary equipment and other cleaning equipment used for supplying cleaning fluid are strongly demanded to be small and compact. .

[0010] In the electromagnetic plunger pump, when the resonance magnetic armature and the discharge plunger is in the repulsive force of the spring corresponding to the period of the intermittent pulse current for energizing the electromagnetic coil, but increase the discharge capacity of the pump in sprint grayed hammer action, electromagnetic Noise may be generated due to irregularities due to differences in the natural frequencies of the vibration system components that make up and operate the plunger pump.

[0011]

Means for Solving the Problem The above-mentioned problem, that is, the means for solving this problem is to apply a pulsed intermittent current to an electromagnetic coil so that the electromagnetic coil is fitted in a longitudinal axial hole of the electromagnetic coil. By the change in volume of the discharge plunger that slides and reciprocates in the cylinder substantially on the extension line of the axis in conjunction with the electromagnetic plunger that slides and reciprocates in the cylindrical cylinder,
A positive displacement pump that pressurizes a fluid flowing from an intake port and discharges the fluid from the discharge port, wherein a flange portion of an upper edge of a bowl-shaped flange fixed to one end of the discharge plunger and having a flow passage is provided. and running through the upper longitudinal axis of said electromagnetic plunger
In the inner sinus, crossing the center near the center on the vertical axis
A stepped ring-shaped jetty for the main part near one end was formed.
Abut the seat and allow loose fitting on the vertical axis.
In addition , the flange portion is sandwiched between the electromagnetic plunger and the end portion of one of the two springs that balance and support the electromagnetic plunger from opposite directions via the seat. It is a characteristic electromagnetic plunger pump.

Further, the flange has a flow opening area.
Equipped with a plurality of adjusted flow passages , it suppresses the excessive pulsation amplitude stroke length of the discharge plunger in accordance with the required discharge pressure flow rate of the pump, and the vibration accompanying this and the gun type oil burner This electromagnetic for fuel hydraulic pressure supply
When using the plunger pump, pulsation and
In which it may reduce that noise.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical cross-sectional explanatory view showing a partial cross section of the embodiment, and FIG. 2 is an enlarged vertical cross-sectional explanatory view of a main part taken along the line AA of FIG.

The general structure of this type of electromagnetic plunger pump is briefly described here, though it is needless to say.

An electromagnetic plunger 11 which is slidably and reciprocally fitted into a tube column cylinder 14 fitted in a longitudinal axial hole of an electromagnetic coil 35 and a cylinder 15 erected on a main body 25 on an extension line of the axial center. and ejection plunger 13 is being fixed to an end of said discharge out plunger 13, the flange portion 43 of the upper edge of the bowl-shaped flange 12 having a flow passage 34, to running through the upper longitudinal axis of said electromagnetic plunger 11 Inside the inner cave 45
It is brought into contact with a seat 44 formed with a stepped ring-shaped jetty provided in the main part near one end near the central part on the axial line and beyond its midpoint , and with respect to the vertical axis. Two springs, which are loosely fitted and fitted to the shaft center while allowing a slight amount of play on a straight cross section, and which balance-support the support seat 44 and the electromagnetic plunger 11 in opposite directions, That is, the tube cylinder 1
It is sandwiched between the return spring 16 from the side of the magnetic head 26 fitted to the end of No. 4 and the auxiliary spring 17 from the side of the cylinder 15 erected on the main body 25. The flange of the upper edge of the flange 12 may be brought into contact between the receiving seat 44 and the upper end of the auxiliary spring 17 and similarly loosely fitted.

A bobbin 36 that faces the upper end surface of the magnetic head 26 and can be attached thereto, and has an electromagnetic coil 35 wound around it.
Of the valve element 28 that is fitted to the end of the valve and engages with the electromagnetic valve seat 30 at the upstream end of the discharge orifice 32 connected to the discharge port 33.
And a discharge joint 31 containing an electromagnetic movable piece 27 that is pressed and closed by an electromagnetic valve spring 29 when the power is cut off. A shaft retaining ring 42 is fitted on the discharge joint 31. The magnetic iron plate 39 and the bobbin 36 are attached to the shaft retaining ring 42 on the lower plate 40 that is fixed to the main body 25 by the mounting screw 37 integrally with the annular magnetic path that is externally fitted to the tube cylinder 14. The yoke 38 is sandwiched by screwing it with a mounting screw 41.

The magnetic head 26, magnetic iron plate 39, outer casing yoke 38 and lower plate 40 constitute a magnetic circuit.

A suction joint 18 having a suction port 19 is attached to the main body 25. Further, although its structure is not shown, a suction valve 22 whose structure is shown by a chain double-dashed line,
A mechanism of the discharge valve 23, an accumulator, a pressure reducing valve or a relief valve as the pressure adjusting mechanism 24, and if necessary, a slow ignition boosting delay mechanism for a gun type burner or the like are built-in or additionally provided.

The electromagnetic valve mechanism including the electromagnetically movable piece 27 and the valve body 28 is a fuel cutoff valve. Since these are disclosed and described in the respective prior art publications, the description thereof will be omitted.

When an intermittent pulse current is applied to the electromagnetic coil 35 from a power source (not shown), the reciprocating motion of the discharge plunger 13 interlocking with the electromagnetic plunger 11 and the cooperative action of the suction and discharge valves 22 and 23, The liquid from the liquid storage tank (not shown) also enters the pump body 25 as shown by the arrow a, passes through the filter 20, and is sucked by the suction valve 22 from the arrow c.
The pressure chamber 21 in the cylinder 15 from the arrow e, the discharge valve from the arrow f, the pressure adjusting mechanism 24 to the arrow g from the arrow d, the pipe cylinder 14, the flow passage 34 of the flange 12, the solenoid valve seat 30, the discharge orifice 32. After that, it is discharged from the discharge port 33 of the discharge joint 31 and further from a nozzle or the like through a pipe.

The electromagnetic movable piece 27 is continuously attracted to the magnetic head 26 while the electromagnetic plunger 11 reciprocates while the intermittent pulsed current is being applied to the electromagnetic coil 35, and the electromagnetic movable piece 27 is continuously attracted to the electromagnetic coil 35. Only when the electric current is cut off, the adsorption is released and the electromagnetic valve seat 30 is closed by the valve body 28 to act as a fuel cutoff valve.

Since the electromagnetic plunger pump of the present invention can be provided with the receiving seat 44 forming the ring-shaped jetty provided in the inner cavity 45 of the electromagnetic plunger 11 on the longitudinal axis of the electromagnetic plunger 11 near its central portion. Therefore, since the collar portion 43 of the flange 12 fixed to the discharge plunger 13 is also in contact with the seat, the axial length of the electromagnetic plunger 11 and the discharge plunger connected is shortened, and the electromagnetic plunger pump as a whole. The height of the main body can be reduced to 25
The height from the lower part of the box to the upper part of the outer box yoke 38 is about 15% lower than that of the same model of the applicant of the present application, and as mentioned above, it is possible to make the short and compact size requested. It was

The flange 12 is made of a tough material such as a stainless steel plate for springs or a beryllium bronze plate.
Alternatively, it is also possible to provide a ring-shaped packing made of synthetic rubber, synthetic resin or the like between the collar portion 43 and the receiving seat 44 to help cushion and prevent noise.

Then, as described above, the flow passage 34 of the flange 12 is selected and adjusted in shape, cross-sectional area and the number thereof, as shown in FIG. 4, for example, like the flow passages 34 'and 34 "of the flange 12'. By adjusting the flow resistance,
When trying to reduce the vibration stroke and the noise by suppressing the amplitude stroke length of the excessive pulsation of the discharge plunger 13 corresponding to the required discharge pressure flow rate of the pump, the liquid leakage is prevented by the interposition of the ring-shaped packing. To facilitate the adjustment.

Next, the flow resistance is adjusted by the adjustment of the flow passage 34 to change the pulsation and the peak value.
The point of suppressing fluctuation will be described.

FIG. 8 shows the state of discharge pulsation of the electromagnetic plunger pump when the flow resistance of the liquid is adjusted by changing the cross-sectional area by changing the shape, size and number of the flow passages 34.

In this experiment, the pump discharge joint 3
No. 1 was connected to a nozzle of a gun type oil burner through a discharge side pipe, and white kerosene was sprayed at a discharge pressure of 10 kgf / cm ² .

The discharge pressure at this time was adjusted by a relief valve.

Nozzles of 1.75, 1.2, 1.0, and 0.65 gallons per hour were sequentially replaced and used, and the measured discharge flow rates were 6.89, 4.89, 4.10, and 2.65 liters per hour, respectively.

The flow passage 34 shown in FIG. 3 has a total length of 20 mm ² . In order to make the total cross-sectional area of the flow passage almost equal to this, the discharge pulsation waveform when the holes of 2.5 mm in diameter are drilled at four places at equal intervals in the bowl-shaped part of the flange 12 and the total cross-sectional area is 19.6 mm ² Figure 8 (a) also shows a diameter of 2.2 m
2 holes each of m and 2.0 mm are drilled, the total cross-sectional area is 13.8 mm
Fig. 8 (b) shows the waveform of the one with ² flow passages, and two holes with a diameter of 2.2 mm were drilled again to show the total cross-sectional area of the flow passages.
The waveforms of those having 7.6 mm ² are shown in FIG. The nozzle used was 1.0 GPH (gallon per hour). At this time, the electromagnetic coil is 100 V, 5 V
A pulse current obtained by half-wave rectifying 0 Hz was activated.

In FIG. 8, the horizontal axis represents time t.m. Sec is a pulsation waveform diagram of the discharge pressure when the pressure Pkgf / cm ² is taken on the vertical axis.

When a nozzle for each flow rate is used,
The cross-sectional area of the through hole 34 'is 19.6 mm ^2, that is, FIG.
In the case of (a), the waveform of the pulsation hardly changes, and the peak value, that is, the pulsation is large. As shown in Fig. 8 (b) and Fig. 8 (c), the peak value is reduced to about 1/2 when the total cross-sectional area of the flow holes is made small to increase the flow resistance, and the discharge is reduced. It is clear that the pulsation is suppressed.

However, if the cross-sectional area of the flow passage is made too small to increase the flow resistance, both the discharge pressure and the flow rate will decrease when a nozzle with a relatively large discharge flow rate is attached, and it will not be practically applicable. Should be fully considered.

[0035]

As described above, the electromagnetic plunger pump according to the present invention obtains the following effects, among others, due to the features described in the claims. (A) Since the electromagnetic plunger and the discharge plunger are in contact with each other through the flange in the axial direction with a slight play on the straight plane, the two plungers, the pipe cylinder and the axial center of the cylinder fitted respectively to them are There is a slight tolerance because there is no need to make a perfect match geometrically, and there is also a tolerance in each bend, ie, straightness and eccentricity of the bend, which facilitates maintaining the accuracy of each part, Therefore, the cost is reduced and it is economical. (B) Uneven wear and operation lock due to lateral pressure during the fitting reciprocating motion of the above parts are prevented, the life of the pump is extended, and deterioration of the discharge performance is prevented. (C) Since the flange is brought into contact with the stepped ring-shaped receiving seat provided in the main part of the inner cavity of the electromagnetic plunger and is loosely fitted on the shaft center with play, the overall height of the electromagnetic plunger pump itself can be kept low. It can be compact, compact and saves the pump installation space. (D) Since the tappet portion and the contact ring are not used as the contact means between the plunger and the discharge plunger, not only the advantages described in (c) above are obtained, but also the tappet portion and the contact ring are interposed. There is no risk of chattering noise during pump operation. (E) Excessive pulsation amplitude stroke of the discharge plunger corresponding to the required discharge pressure flow rate of the pump by selecting the shape, cross-sectional area and number of the flow passages of the flange to adjust the flow resistance. Vibration can be suppressed by suppressing the length, and noise due to pulsation during combustion when this pump is used to supply fuel to a gun type oil burner can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross sectional explanatory view showing a partial cross section of an electromagnetic plunger pump according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the AA cross section of FIG.

FIG. 3 is a plan view of the flange of FIG.

FIG. 4 is an enlarged plan view of a flange in another embodiment of the electromagnetic plunger pump of the present invention.

FIG. 5 is a vertical cross-sectional explanatory view of a main part of an electromagnetic plunger pump according to a conventional technique.

FIG. 6 is a vertical cross-sectional explanatory view of a main part of an electromagnetic plunger pump according to a conventional technique.

FIG. 7 is a vertical cross-sectional explanatory view of a main part of an electromagnetic plunger pump according to a conventional technique.

FIG. 8 is a waveform diagram comparing discharge pulsations of electromagnetic plunger pumps having different shapes, cross-sectional areas, and numbers of the flow passages of the flange.

[Explanation of symbols]

1 Electromagnetic plunger pump 11 Electromagnetic plunger 12 flange 13 Discharge plunger 14 Tube cylinder 15 cylinders 16 Return spring 17 Auxiliary spring 18 Inhalation joint 25 body 31 Discharge joint 34 Flow passage 35 electromagnetic coil 43 collar part 44 seat 45 Inner Cave

─────────────────────────────────────────────────── ───Continued from the front page (56) References JP-A-8-159018 (JP, A) JP-A-54-15504 (JP, A) Actually open 57-97189 (JP, U) Actual-open Sho 57- 97190 (JP, U) Actual development Sho 57-97188 (JP, U) Actual development Sho 53-123604 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F04B 17/04

Claims (2)

(57) [Claims] 1. An electromagnetic plunger that slides and reciprocates in a tube cylinder (14) fitted in a longitudinal axial hole of the electromagnetic coil by energizing the electromagnetic coil (35) with a pulsed intermittent current.
Due to the change in volume of the discharge plunger (13) that slides and reciprocates in the cylinder (15) approximately on the extension of the axis in conjunction with (11),
Pressurize the fluid flowing from the suction port (19) and discharge it.
A positive displacement pump for discharging from (32), wherein a flange (43) at the upper edge of a bowl-shaped flange (12) fixed to one end of the discharge plunger (13) and having a flow passage (34) is provided. , In the inner cavity (45) that extends vertically on the vertical axis of the electromagnetic plunger ,
In the main part near the central part and near one end beyond the center
Abut the seat (44) that formed the stepped ring-shaped jetty,
In addition , two springs (16, 17) which allow loose fitting to the vertical axis and balance-support the electromagnetic plunger (11) from opposite directions via the seat (44). An electromagnetic plunger pump characterized in that the collar portion (43) is sandwiched between the spring portion and the end portion of one of the springs. 2. The flange (12) has a flow opening area.
An electromagnetic plunger pump according to claim 1, characterized in that it comprises a plurality of de-adjusted flow passages (34) .