JP3785595B2 - Electromagnetic pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic pump mainly used in a combustion apparatus such as an oil heater.
[0002]
[Prior art]
The electromagnetic pump has a structure in which pulsation is likely to occur in the fluid to be discharged, because the pump action is performed by the cooperation of the piston, the suction valve, and the discharge valve that are driven by the electromagnetic plunger that linearly reciprocates by electromagnetic force. As countermeasures, smoothing of the pulsation of the discharged fluid has been achieved by providing an accumulator in the fluid passage or by providing a pressure adjusting valve for adjusting the pressure of the pressurized fluid.
[0003]
The present applicant has devised a technique for preventing pulsation by providing an orifice in a through hole of a magnetic rod forming a fluid passage. However, in order to draw out the effect of the orifice, an accumulator must be provided, and the accumulator must be provided at a position downstream of the orifice and before the solenoid valve.
[0004]
[Problems to be solved by the invention]
However, our electromagnetic pump has a structure as shown in, for example, Japanese Patent No. 3232396, and penetrates through the electromagnetic coil 2 to the through hole 13 of the magnetic rod 8 and to the electromagnetic valve storage chamber 39 formed in the discharge joint 36. And the accumulator could not be installed. That is, there was no appropriate place for the accumulator.
[0005]
In addition, it has been devised that the orifice is formed by reducing the diameter of a part of the through-hole 13 of the magnetic rod 8, but it has to be processed with large and small hole diameters and has the disadvantage of increasing the number of steps. It was. Further, when it is adopted in a boiler for home use, it has a solenoid valve 40, but a double safety device is necessary to prevent the drooping. In this case, liquid has accumulated in the fluid passage downstream of the solenoid valve, and there is a possibility that dust etc. will not be closed due to the solenoid valve being caught, and there is a risk that it will flow out due to the fluid head pressure.
[0006]
Accordingly, an object of the present invention is to solve the mounting positions of the orifice and the accumulator and prevent the inconvenience of the solenoid valve, that is, the back-up, in order to prevent fluid pulsation.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, an electromagnetic pump according to the present invention performs a pumping action in cooperation with a piston, a suction valve, and a discharge valve that are driven by an electromagnetic plunger reciprocated by a pulse current applied to an electromagnetic coil. In the electromagnetic pump in which the pressurized fluid flows in the guide case in which the electromagnetic plunger is housed, an orifice is provided in a through hole of a magnetic rod provided at one end of the guide case, and The electromagnetic valve provided on the fluid passage that passes through the discharge port is composed of an electromagnetic movable piece and a valve body, the valve body is provided at the tip of a rod extending from the electromagnetic movable piece and protruding from one end of the electromagnetic coil, The seat is seated on a valve seat provided on the fluid passage, and one or more accumulators are disposed between the electromagnetic movable piece and the valve seat in the fluid passage. (Claim 1).
[0008]
Therefore, when the pressurized fluid passes through the orifice formed in the through hole of the magnetic rod, the pulsation is smoothed, and the pulsation remaining in the fluid that has passed through the orifice is reduced between the electromagnetic movable piece of the electromagnetic valve and the rod. Further smoothing is performed by an accumulator mounted on a fluid passage between the valve seat of the valve body provided at the tip. Moreover, the structure of the solenoid valve is such that the valve body is provided on the rod extending from the electromagnetic movable piece, and the valve seat position where the valve body on the downstream side of the electromagnetic movable piece is seated is extended to the discharge port side by the fluid passage, One or more accumulators can be easily attached by extending the length of the fluid passage to the valve seat.
[0009]
The above-mentioned orifice is formed in a spring seat that is inserted into the through hole of the magnetic rod and receives the spring of the electromagnetic valve. Thereby, there is an advantage that machining of the through hole of the magnetic rod is not required only by machining the orifice in the spring seat. Moreover, since the spring seat is inserted into the through hole of the magnetic rod, no means for mounting is required, and since it is pressed by the electromagnetic valve spring, it cannot be pulled out of the through hole.
[0010]
A filter is disposed between the spring seat and the magnetic rod (Claim 3), and the filter is a mesh (Claim 4). Thus, the filter can be easily mounted and the net has a function of rectifying the fluid.
[0011]
Furthermore, a check valve is provided downstream of the electromagnetic valve in the fluid passage (Claim 5). This prevents the fluid accumulated downstream from the solenoid valve when the solenoid pump is stopped, and prevents the fluid from flowing out even when the solenoid valve is not completely closed with dust or the like.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0013]
1 to 3 show an electromagnetic pump 1 according to an embodiment of the present invention. This electromagnetic pump 1 supplies pressurized fuel to an oil burner in an oil heater or the like, and includes an electromagnetic coil 2 to which intermittent current (pulse current) is applied in a case 4 formed of a magnetic material such as iron. Have. The electromagnetic coil 2 is formed by winding an electric wire around a resin bobbin 3, and a guide pipe 5 made of metal and non-magnetic material is inserted into a through-hole formed so as to penetrate the center of the bobbin 3. It is inserted. Further, an upper plate 6 and a lower plate 7 are disposed at the upper and lower ends of the bobbin 3, and constitute a magnetic circuit together with the case 4.
[0014]
A magnetic rod 39 described below is disposed above the guide pipe 5, and the lower end of the guide pipe 5 is fitted into the pump body 10 via an O-ring 9. Inside the guide pipe 5 is formed an electromagnetic plunger working chamber 16 in which an electromagnetic plunger 15 formed in a substantially cylindrical shape by a magnetic material such as iron is disposed. A lower spring 18 is slidably supported in the electromagnetic plunger working chamber 16. The electromagnetic plunger working chamber 16 is divided into an upper spring chamber 16a and a lower spring chamber 16b by the electromagnetic plunger 15, and the upper spring chamber 16a and the lower spring chamber 16b are longitudinally penetrating the electromagnetic plunger 15 in the vertical direction. The holes 20 communicate with each other.
[0015]
A piston 21 is fixed to the lower part of the electromagnetic plunger 15. The piston 21 is inserted into a cylindrical cylinder 24 fitted into a hole 22 formed in the pump body 10 via an O-ring 23 and reciprocates up and down as the plunger 15 slides. The cylinder 24 has a flange 26 formed at the outer peripheral portion in the middle thereof, an O-ring 23 at the lower end, and a lower spring 18 abutting on the upper end, and also has a function of supporting the lower end of the lower spring 18. ing. A pump chamber 27 is defined at the lower end portion of the hole 22 by the pump body 10, the tip of the piston 21, the suction valve 28, and the discharge valve 29 (see FIG. 3).
[0016]
The pump chamber 27 is a part that changes its volume by the reciprocating motion of the piston 21 and generates a pump action in cooperation with the suction valve 28 and the discharge valve 29 shown in FIG. That is, when the pressure in the pump chamber 27 is lowered due to the rise of the piston 21 and becomes lower than the pressure in the suction hole 30, the fluid opens the suction valve 28 by the pressure difference and is sucked into the pump chamber 27. When the pressure in the pump chamber 27 increases and becomes higher than the pressure on the downstream side of the discharge valve 29, the fluid opens the discharge valve 29 and flows into the pressure regulating valve 32 due to the pressure difference.
[0017]
The pressure adjusting valve 32 adjusts the pressurized fluid discharged from the discharge valve 29 to a predetermined pressure and causes it to flow out into the plunger working chamber 16. A valve body 35 slidably supported by the second spring 34 and a throttle hole 36, the piston body 37 is used to displace the valve body 35 in accordance with the pressure of the pressurized fluid, The pressure of the fluid sent to the plunger working chamber 16 is set by appropriately reducing the area of the flow path formed between the throttle hole 36. That is, the pressure of the discharged fluid can be adjusted to a predetermined value according to the setting force of the second spring 34. The pressure-adjusted fluid flows into the above-described plunger working chamber 16, and pulsation is further absorbed by the first accumulator 38 communicating on the way.
[0018]
The magnetic rod 39 is made of a magnetic material such as iron, and a substantially lower half thereof is fitted into the guide pipe 5 via an O-ring 40, and the remaining upper half is described below via an O-ring 41. The electromagnetic valve case 62 is inserted. A through hole 42 passes through the magnetic rod 8 in the central axis direction, and the through hole 42 has a larger diameter on the upper side than the lower side with the stepped portion 43 interposed therebetween. A spring seat 52 of a spring 51 of an electromagnetic valve 50 described below is inserted into the large diameter side of the through hole 42 and is locked to the step portion 43. The small diameter side of the through hole 42 communicates with the plunger working chamber 16.
[0019]
The spring seat 52 has an orifice 53 formed at the center thereof, and its diameter is around 0.6 mm. The spring seat 52 is fitted in the through hole 42, and a filter 54 is sandwiched between the spring seat 52 and the magnetic rod 39. The filter 54 is made of steel, and removes wear debris and swarf, and also controls rectification.
[0020]
The electromagnetic valve 50 includes an electromagnetic movable piece 56 made of a magnetic material and having a substantially cylindrical shape, and a rod 57 extending upward from the electromagnetic movable piece 56, and more specifically, a step 58 formed at the center of the electromagnetic movable piece 56. The flange portion 60 at the lower end of the rod 57 is pressed and locked by the electromagnetic valve spring 51. That is, a predetermined protruding dimension A protrudes from the upper end of the electromagnetic coil 2 up to the valve body 64 of the rod 57 of the electromagnetic valve 50 (FIG. 1). Reference numeral 61 denotes a fluid passage groove formed in the collar portion 60.
[0021]
The electromagnetic valve case 62 includes a large-diameter cylindrical member 62a having an opening at the bottom and a small-diameter cylindrical member 62b that extends upward. The electromagnetic valve case 62 includes a valve seat 63 at the tip of the small-diameter cylindrical member 62b. An electromagnetic valve storage chamber 70 having a large cylindrical chamber 70a and a small cylindrical chamber 70b is configured to be fitted to the upper end.
[0022]
The electromagnetic movable piece 56 is disposed in the large-diameter cylindrical chamber 70 a of the electromagnetic valve storage chamber 70, and the rod 57 is disposed in the small-diameter cylindrical chamber 70 b and is pressed by the electromagnetic valve spring 51. 64 is seated on the valve seat 63 and the vertical hole 65 is closed. That is, the electromagnetic valve case 62 that encloses the electromagnetic valve 50 protrudes by a predetermined dimension so that the small-diameter cylindrical member 62 b encloses the rod 57 having the valve body 64. The small cylindrical portion 70 b has a gap with the rod 57, and the pressure in the small cylindrical chamber 70 b is the same as that of the through hole 42 downstream from the orifice 53 described above.
[0023]
The accumulator joint 68 is formed with an insertion portion 73, a vertical hole 74 connected to the insertion portion 73, and lateral holes 75, 76 connected to the insertion portion 73. The insertion portion 73 is externally fitted to the electromagnetic valve case 62 and attached. Yes. The accumulator joint 68 is provided with accumulator attachment portions 77 and 78 at the ends of the lateral holes 75 and 76, and a second accumulator 80 and a third accumulator 81 are attached to the attachment portions 77 and 78. . Therefore, the second and third accumulators 80 and 81 pass through the lateral holes 75 and 76 and communicate with the electromagnetic valve storage chamber 70 through the holes 66 and 67 formed in the electromagnetic valve case 62, thereby causing pulsation. It works to absorb pressure.
[0024]
The discharge joint 83 is formed with a discharge passage 85 having a discharge port 84 in the axial direction, is fitted on the accumulator joint 68, and communicates with the vertical hole 74 described above. A check valve 86 is disposed in the discharge passage 85 of the discharge joint 83, and the check valve 86 closes when the pump is stopped, thereby preventing backlash.
[0025]
In the above-described configuration, when a pulse current is applied to the electromagnetic coil 2, the electromagnetic plunger 15 reciprocates, the piston 21 is also driven, and the suction valve 28 and the discharge valve 29 perform the pumping action, so that the pressurized fluid The pressure is regulated by the pressure regulating valve 32 and flows into the electromagnetic plunger working chamber 16. First, the pulsation is absorbed by the first accumulator 38.
[0026]
The pressurized fluid is provided in the through hole 42 of the magnetic rod 39 fixed to the guide pipe 5 and passes through the orifice 53 to reach the electromagnetic valve storage chamber 70, but is throttled by the orifice 53 and absorbs pulsation. . Although the pulsation still remains in the pressurized fluid reaching the electromagnetic valve storage chamber 70, it is almost absorbed by the second and third accumulators 80 and 81 and pushes the check valve 86 in the discharge passage 85. It is opened and discharged from the discharge port 84 to an external device.
[0027]
When energization of the electromagnetic coil 2 is stopped, the pump action is stopped and the electromagnetic valve 50 is pressed by the electromagnetic valve spring 51, and the valve body 64 is seated on the valve seat 63, thereby forming a vertical hole 65 serving as a fluid passage. And fluid outflow is prevented. And since the check valve 86 downstream is also closed, the fluid in the discharge passage 85 is prevented from flowing out. Even if dust adheres to the electromagnetic valve 56 and does not close, the check valve 86 is closed, so that unnecessary fluid is prevented from flowing out.
[0028]
The smoothing of the pulsation of the pressurized fluid is performed by the orifice 53 and the first, second, and third accumulators 38, 80, and 81. The orifice 53 is formed in the spring seat 52 of the electromagnetic valve, so that the magnetic rod Compared with processing and forming the through hole, the cost is extremely low, and there is an advantage that the processing of the magnetic rod is not used. In order to attach the second and third accumulators 80 and 81, the electromagnetic valve is composed of the electromagnetic movable piece 56 and the valve body 64 having the rod 57 extending long therefrom. The member 62b has a protruding shape, and a small cylindrical chamber 70b serving as a fluid passage extends to the discharge port side, so that the accumulator can be easily attached to the small-diameter cylindrical member 62b.
[0029]
【The invention's effect】
As described above, according to the present invention, when the pressurized fluid passes through the orifice, the pulsation is smoothed and the remaining pulsation passing through the orifice is absorbed by the accumulator provided on the fluid passage. Is done. This accumulator can be easily mounted by extending the fluid passage in the solenoid valve case surrounding the solenoid valve whose rod extends from the solenoid movable piece to the discharge port side.
[0030]
Further, since the orifice is formed in the spring seat of the electromagnetic valve spring, it is very easy to attach to the magnetic rod. Further, since the spring seat is pressed by the electromagnetic valve spring, it does not come out of the through hole (Claim 2).
[0031]
Since the filter is disposed between the spring seat and the magnetic rod, the filter can be easily mounted, and a rectifying action can be obtained for the net.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a solenoid valve according to the present invention.
FIG. 2 is a cross-sectional view of the above.
FIG. 3 is an enlarged vertical sectional view of the main part of the above.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electromagnetic pump 2 Electromagnetic coil 5 Guide pipe 10 Pump main body 15 Electromagnetic plunger 16 Electromagnetic plunger working chamber 21 Piston 24 Cylinder 27 Pump chamber 28 Suction valve 29 Discharge valve 32 Pressure adjusting valve 35 Valve body 36 Restriction hole 38 1st accumulator 39 Magnetic Rod 42 Through-hole 50 Solenoid valve 51 Solenoid valve spring 52 Spring seat 53 Orifice 56 Electromagnetic movable piece 57 Rod 62 Solenoid valve case 63 Valve seat 64 Valve body 68 Accumulator joint 70 Solenoid valve storage chamber 70a Large cylindrical chamber 70b Small cylindrical chamber 80 2 accumulator 82 3rd accumulator 83 discharge joint 84 discharge port 86 check valve

Claims (5)

Fluid that pressurizes in the guide case in which the electromagnetic plunger is pumped by the cooperation of a piston, a suction valve, and a discharge valve driven by an electromagnetic plunger reciprocated by a pulse current applied to the electromagnetic coil. In an electromagnetic pump that allows
While providing an orifice in the through hole of the magnetic rod provided at one end of the guide case,
The electromagnetic valve provided on the fluid passage extending from the through hole to the discharge port is composed of an electromagnetic movable piece and a valve body, and the valve body extends from the electromagnetic movable piece to the tip of the rod protruding from one end of the electromagnetic coil. And is seated on a valve seat provided on the fluid passage,
One or more accumulators are attached between the electromagnetic movable piece and the valve seat in the fluid passage. 2. The electromagnetic pump according to claim 1, wherein the orifice is formed in a spring seat that is inserted into a through hole of the magnetic rod and receives a spring of the electromagnetic valve. The electromagnetic pump according to claim 1, wherein a filter is disposed between the spring seat and the magnetic rod. The electromagnetic pump according to claim 3, wherein the filter is a mesh. The electromagnetic pump according to claim 1, wherein a check valve is provided downstream of the electromagnetic valve in the fluid passage.

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