JP2004027907A - Electromagnetic pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce pulsing of a pressurized fluid in an electromagnetic pump for performing a pump action by reciprocating a piston. <P>SOLUTION: The pressurized fluid is constituted to flow through a guide pipe, and an orifice is installed to an insertion hole of a magnetic rod attached to the guide pipe. An electromagnetic valve is installed to the downstream side of the orifice, and the rod of the electromagnetic valve is extended to project from a top end of an electromagnetic coil. An electromagnetic valve case surrounding the electromagnetic valve is shaped to project to a discharge port side in a manner to accommodate the electromagnetic valve, and an accumulator is connected with a fluid passage at a discharging portion. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electromagnetic pump mainly used in a combustion device such as an oil heater.
[0002]
[Prior art]
The electromagnetic pump has a structure in which pulsation is liable to be generated in the discharged fluid because the pump works in cooperation with a piston driven by an electromagnetic plunger that linearly reciprocates by an electromagnetic force and a suction valve and a discharge valve. As a countermeasure, pulsation of the discharged fluid has been smoothed by providing an accumulator in the fluid passage or a pressure adjusting valve for adjusting the pressure of the pressurized fluid.
[0003]
The present applicant has devised a technology for preventing pulsation by providing an orifice in a through hole of a magnetic rod forming a fluid passage. However, to obtain the effect of the orifice, an accumulator must be provided, and the accumulator must be provided at a position downstream of the orifice and up to 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 the electromagnetic coil 2 and communicates with the through hole 13 of the magnetic rod 8 and with the electromagnetic valve storage chamber 39 formed in the discharge joint 36. And could not attach an accumulator. That is, there is no suitable place for installing the accumulator.
[0005]
In addition, it has been considered that the orifice is formed by reducing the diameter of a part of the through hole 13 of the magnetic rod 8, but it is necessary to machine a large or small hole diameter, which has a disadvantage that the number of steps increases. I was Further, when employed in a domestic boiler, it has an electromagnetic valve 40, but a double safety device was required to prevent backdrop. The liquid is also accumulated in the fluid passage downstream of the solenoid valve, and dust may be caught by the solenoid valve and may not be closed, so that there is a risk that the fluid flows out due to the head pressure of the fluid.
[0006]
Therefore, an object of the present invention is to solve the mounting positions of the orifice and the accumulator and to prevent inconvenience of the solenoid valve, that is, to prevent backlash 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 pump action in cooperation with a piston driven by an electromagnetic plunger reciprocated by a pulse current applied to an electromagnetic coil, a suction valve, and a discharge valve. An electromagnetic pump in which a pressurized fluid flows in a guide case in which the electromagnetic plunger is housed, wherein an orifice is provided in a through hole of a magnetic rod provided at one end of the guide case, and an orifice is provided from the through hole. The electromagnetic valve provided on the fluid passage passing through the discharge port includes an electromagnetic movable piece and a valve element, and the valve element is provided at a tip of a rod extending from the electromagnetic movable piece and protruding from one end of the electromagnetic coil. A valve seat provided on the fluid passage is seated, and one or more accumulators are arranged between the electromagnetic movable piece of the fluid passage and the valve seat. (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 passing through the orifice is generated by the electromagnetic movable piece of the solenoid valve and the rod. The fluid is further smoothed by an accumulator mounted on the fluid passage between the valve seat of the valve element provided at the tip. Moreover, the structure of the electromagnetic valve is such that the valve body is provided on a rod extending from the electromagnetic movable piece, and the valve seat position on which the valve body is seated downstream of the electromagnetic movable piece extends to the discharge port side in the fluid passage, The length of the fluid passage to the valve seat is extended, so that one or more accumulators can be easily attached.
[0009]
The orifice is inserted into a through hole of the magnetic rod and is formed on a spring seat for receiving a spring of the solenoid valve (claim 2). Accordingly, there is an advantage that the machining of the through hole of the magnetic rod is unnecessary 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 the spring seat 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 net (claim 4). Accordingly, the filter can be easily mounted and the net has a function of rectifying the fluid.
[0011]
Further, a check valve is provided downstream of the solenoid valve in the fluid passage (claim 5). This prevents the fluid accumulated downstream of the solenoid valve from flowing out when the electromagnetic pump is stopped, and prevents the fluid from flowing out even when the solenoid valve is not completely closed due to dust or the like.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0013]
1 to 3 show an electromagnetic pump 1 according to an embodiment of the present invention. The electromagnetic pump 1 supplies pressurized fuel to an oil burner in a petroleum heater or the like, and includes an electromagnetic coil 2 to which an 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 bobbin 3 made of resin, and a guide pipe 5 made of a nonmagnetic material made of metal is provided in a through hole formed so as to penetrate the center of the bobbin 3. It is inserted. An upper plate 6 and a lower plate 7 are arranged at the upper end and the lower end of the bobbin 3, and constitute a magnetic circuit together with the case 4.
[0014]
A magnetic rod 39 described below is arranged above the guide pipe 5, and the lower end of the guide pipe 5 is inserted into the pump body 10 via an O-ring 9. An electromagnetic plunger working chamber 16 in which an electromagnetic plunger 15 made of a magnetic material such as iron is formed in a substantially cylindrical shape is formed in the guide pipe 5. The 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 extend vertically through the inside of the electromagnetic plunger 15. It is communicated via the hole 20.
[0015]
A piston 21 is fixed below the electromagnetic plunger 15. The piston 21 is inserted into a cylindrical cylinder 24 inserted through 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 an outer peripheral portion in the middle of the cylinder 24, an O-ring 23 abuts on a lower end thereof, a lower spring 18 abuts on an upper end thereof, and also has a function of supporting a lower end of the lower spring 18. ing. At the lower end of the hole 22, a pump chamber 27 is defined 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 whose volume is changed by the reciprocating motion of the piston 21 to generate 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 decreases due to the rise of the piston 21 and becomes lower than the pressure in the suction hole 30, the fluid is sucked into the pump chamber 27 by opening the suction valve 28 due to the pressure difference. When the pressure in the pump chamber 27 rises due to the pressure drop and becomes higher than the pressure downstream 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 the fluid to flow into the plunger working chamber 16. Specifically, the first spring 33 and the A valve body 35 slidably supported by a second spring 34 and a throttle hole 36, and the valve body 35 is displaced using a piston 37 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 passage formed between the throttle hole 36. That is, the pressure of the discharge fluid can be adjusted to a predetermined value according to the set force of the second spring 34. The pressure-adjusted fluid flows into the plunger working chamber 16 described above, and the pulsation is further absorbed by the communicating first accumulator 38 on the way.
[0018]
The magnetic rod 39 is formed of a magnetic material such as iron, and a substantially lower half thereof is inserted into the guide pipe 5 via an O-ring 40, and the other upper half thereof is described below via an O-ring 41. It is fitted into the solenoid valve case 62. A through-hole 42 penetrates through the magnetic rod 8 in the direction of the central axis, and the through-hole 42 has a larger diameter on the upper side than on the lower side with the step portion 43 interposed therebetween. A spring seat 52 of a spring 51 of the electromagnetic valve 50 described below is inserted into the large-diameter side of the through hole 42 and is engaged with the step 43. The small diameter side of the through hole 42 communicates with the plunger working chamber 16.
[0019]
The orifice 53 is formed at the center of the spring seat 52, and its diameter is about 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 shavings, and also has a rectifying function.
[0020]
The electromagnetic valve 50 comprises a substantially cylindrical electromagnetic movable piece 56 made of a magnetic material, 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 collar 60 at the lower end of the rod 57 is pressed and locked by the solenoid valve spring 51 in the hole 59 having the shape. That is, the electromagnetic valve 50 has a structure in which a predetermined protrusion dimension A protrudes from the upper end of the electromagnetic coil 2 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 extending upward. The small-diameter cylindrical member 62b is provided with a valve seat 63 at the tip thereof. An electromagnetic valve storage chamber 70 having a large cylindrical chamber 70a and a small cylindrical chamber 70b fitted to the upper end is formed.
[0022]
The solenoid movable piece 56 is disposed in the large-diameter cylindrical chamber 70a of the solenoid valve storage chamber 70, and the rod 57 is disposed in the small-diameter cylindrical chamber 70b. 64 is seated on the valve seat 63 and closes the vertical hole 65. That is, the electromagnetic valve case 62 enclosing the electromagnetic valve 50 has a small-diameter cylindrical member 62b projecting by a predetermined dimension to enclose the rod 57 having the valve element 64. The small cylindrical portion 70b has a gap between the small cylindrical portion 70b and the rod 57, and the pressure in the small cylindrical chamber 70b is the same as that of the through hole 42 downstream of the orifice 53.
[0023]
The accumulator joint 68 has an insertion portion 73, a vertical hole 74 connected to the insertion portion 73, and horizontal holes 75 and 76 connected to the insertion portion 73. The insertion portion 73 is fitted to the solenoid valve case 62 by being fitted to the outside thereof. I have. The accumulator joint 68 is provided with accumulator mounting portions 77, 78 at the ends of the lateral holes 75, 76, and the second accumulator 80 and the third accumulator 81 are mounted on the mounting portions 77, 78. . For this reason, the second and third accumulators 80 and 81 communicate with the electromagnetic valve storage chamber 70 through the holes 66 and 67 formed in the electromagnetic valve case 62 through the lateral holes 75 and 76 to pulsate. 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. The discharge passage 85 is fitted over the accumulator joint 68 and communicates with the vertical hole 74. A non-return valve 86 is disposed in the discharge passage 85 of the discharge joint 83, and functions to close the non-return valve 86 when the pump is stopped and to prevent a backward drop.
[0025]
In the above configuration, when a pulse current is applied to the electromagnetic coil 2, the electromagnetic plunger 15 reciprocates, and the piston 21 is also driven, and the suction valve 28 and the discharge valve 29 perform a pumping operation, and the pressurized fluid Is regulated by the pressure regulating valve 32, flows into the electromagnetic plunger working chamber 16, and the pulsation is first absorbed by the first accumulator 38.
[0026]
Then, the pressurized fluid is provided in the through hole 42 of the magnetic rod 39 fixed to the guide pipe 5, passes through the orifice 53, and reaches the electromagnetic valve storage chamber 70, but is throttled by the orifice 53 to absorb pulsation. . Although the pulsation still remains in the pressurized fluid that has reached the solenoid valve storage chamber 70, it is almost absorbed by the second and third accumulators 80 and 81 and pushes the check valve 86 of the discharge passage 85. It is opened and discharged from the discharge port 84 to an external device.
[0027]
When the energization of the electromagnetic coil 2 is stopped, the pumping operation is stopped and the electromagnetic valve 50 is pressed by the electromagnetic valve spring 51, so that the valve body 64 is seated on the valve seat 63, and thus the vertical hole 65 serving as a fluid passage. And the outflow of fluid is prevented. Since the check valve 86 downstream of the check valve 86 is also closed, the fluid in the discharge passage 85 is also 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 outflow of fluid is prevented.
[0028]
The pulsation of the pressurized fluid is smoothed 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 solenoid valve, and thereby the magnetic rod is formed. It is extremely inexpensive in cost as compared with the case where the through-hole is formed by processing, and has the advantage of not using the processing of the magnetic rod. In addition, when the second and third accumulators 80 and 81 are mounted, the solenoid valve is constituted by the solenoid movable piece 56 and the valve body 64 having the rod 57 extended long from the solenoid valve. The member 62b has a protruding shape, and the small cylindrical chamber 70b serving as a fluid passage extends to the discharge port side, so that the accumulator can be easily mounted on 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 narrowed, and the pulsation remaining after passing through the orifice is absorbed by the accumulator provided on the fluid passage. Is done. The accumulator can be easily mounted by extending the fluid passage in the electromagnetic valve case, which encloses the electromagnetic valve having the rod extending from the electromagnetic movable piece, toward the discharge port side, with the structure of the electromagnetic valve (claim 1).
[0030]
In addition, since the orifice is formed in the spring seat of the solenoid valve spring, it is extremely easy to mount it on the magnetic rod. In addition, since the spring seat is pressed by the solenoid 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 because of the net (claims 3 and 4).
[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 same.
FIG. 3 is an enlarged longitudinal sectional view of a main part of the above.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 electromagnetic pump 2 electromagnetic coil 5 guide pipe 10 pump body 15 electromagnetic plunger 16 electromagnetic plunger working chamber 21 piston 24 cylinder 27 pump chamber 28 suction valve 29 discharge valve 32 pressure regulating valve 35 valve body 36 throttle hole 38 first accumulator 39 magnetism Rod 42 Through hole 50 Electromagnetic valve 51 Electromagnetic valve spring 52 Spring seat 53 Orifice 56 Electromagnetic movable piece 57 Rod 62 Electromagnetic valve case 63 Valve seat 64 Valve element 68 Accumulator joint 70 Electromagnetic valve storage chamber 70a Large cylindrical chamber 70b Small cylindrical chamber 80 2nd accumulator 82 3rd accumulator 83 Discharge joint 84 Discharge port 86 Check valve

Claims (5)

A fluid pressurized in a guide case in which the electromagnetic plunger performs a pump action in cooperation with a piston driven by an electromagnetic plunger reciprocated by a pulse current applied to an electromagnetic coil, a suction valve, and a discharge valve. In an electromagnetic pump that allows
An orifice is provided in the through hole of the magnetic rod provided at one end of the guide case,
An electromagnetic valve provided on a fluid passage that passes from the through hole to the discharge port includes an electromagnetic movable piece and a valve element, and the valve element extends from the electromagnetic movable piece and protrudes from a rod end protruding from one end of the electromagnetic coil. Provided and seated on a valve seat provided on the fluid passage,
An electromagnetic pump, wherein one or more accumulators are mounted between the electromagnetic movable piece of the fluid passage and the valve seat. The electromagnetic pump according to claim 1, wherein the orifice is inserted into a through hole of the magnetic rod, and is formed in a spring seat that 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 net. 2. The electromagnetic pump according to claim 1, wherein a check valve is provided in the fluid passage downstream of the electromagnetic valve.

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