KR0171555B1 - Electromagnetic pump - Google Patents

Abstract

[Problem] It is an object to make the internal pressure of the pulp run upstream from the suction valve when the pump is stopped.

[Remedy] A leak passage bypassing the suction valve is provided in a pump chamber in which a volume change is caused by a piston reciprocating to the electromagnetic coil, and the leak passage is communicated upstream of the suction valve.

Description

Electronic pump

1 is a longitudinal sectional view showing an embodiment of the present invention.

2 is a cross-sectional view of the main part of the statue.

3 is a cross-sectional view of the main portion in the example in which the pressure rise time adjusting device is attached to this invention.

4 is a longitudinal sectional view showing another embodiment of the present invention.

5 is an enlarged cross-sectional view of the statue.

* Explanation of symbols for main parts of the drawings

1: electromagnetic pump 2: electromagnetic coil

15: electromagnetic plunger 24, 78: cylinder

28, 82: suction valve 29, 80: discharge valve

36, 89: leak passage 60: solenoid valve

64: pressure rise time adjusting device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic pump, particularly an electromagnetic pump having a shutoff valve when stopping the pump and stopping the discharge of the fluid.

The solenoid pump reciprocates the piston by using the intermittent suction force generated in the electromagnetic coil by intermittent current to perform the pumping operation in cooperation with the suction valve and the discharge valve, inhale the fluid from the suction hole, and pressurize the discharge hole. Was draining. In such a conventional solenoid pump, the solenoid valve was installed after the discharge hole to stop the flow of the fluid at the same time as the pump was stopped. However, due to the two components, there is a drawback in that the structure becomes large. Has been developed and is now used to become the mainstream of electronic pumps.

Such an electromagnetic valve with a built-in solenoid valve is widely used for oil burners of combustion equipment such as hot water heating. In recent years, in the early stages of combustion, equipment that adopts the mitigation method of reducing noise and pollution emission gas has become mainstream, and as a response to electronic pumps, two methods have been largely taken. .

One is called mechanical and pump pressure actuating type with volume and orifice leakage combined function in the main body of the electric pump, for example, Japanese Patent Application Laid-Open No. 59-7787 (Electronic Pump with Pressure Rise Time Adjustment), Seal No. 62-14173 (Electronic It is mechanically actuated in the pressure rise time adjusting device of the pump) and actual place 62-184180 (the rise time adjusting device of the electromagnetic pump).

The other is called electric, and acts to actuate the discharge pressure of the pump electrically to control the duty ratio of the starting current or pulse current of the pump using the above-described electronic pump using a control circuit.

The two actuating techniques have their own characteristics, but common to both methods is that the discharge hole is closed by a solenoid valve embedded in the solenoid pump when the solenoid pump stops, and a high pressure (for example, 7 kg / Since cm 2) remains, each has a pressure release means.

Mechanical actuating technology has an orifice in the volumetric plunger, which opens the return flow in the revolving spring under pressure before and after the plunger to open the residual pressure to the suction side.

In the electric actuating technique, for example, as shown in the actual place 58-82481 (pump residual pressure elimination device), a small leak port is provided in advance in the relief valve of the electromagnetic pump, As shown in (Residual pressure relief type relief valve of an electromagnetic pump), the orifice was provided between the inside of a pump and a suction path, and it leaked by the suction path side at all times also during pump operation.

Since the dedicated leakage path and orifice have one opening effective area, dust and the like are easily clogged, so that a strainer (filter) is usually provided immediately before or immediately before. However, the on-off control frequency of the electronic pump has been designed and responded to about 200,000 times in the past, but exceeding this much more than 1 million repeated operations are practically necessary, and thus the fine abrasion of the internal movable part of the electronic pump itself is applied. The scale was severely clogged by the influence, resulting in irrationality that the release of internal pressure was impossible.

Then, the invention of Claims 1 and 2 of this invention aims at providing the electromagnetic pump which provides a dedicated leakage path. The invention described in claim 2 shows an example in which a mechanical pressure rise time adjusting device is attached to an electronic pump having the object of the invention according to claim 1.

In order to achieve the above object, the invention described in claim 1 of the present invention is an electromagnetic plunger reciprocating by energizing an intermittent current to an electromagnetic coil, a piston reciprocating in a cylinder in conjunction with the electromagnetic plunger, and the piston A solenoid pump having a suction valve and a discharge valve for pumping in cooperation with a pump, and a shutoff valve for turning off the discharge hole when the solenoid pump is stopped, the pump chamber having a part of the piston defining a bypass portion of the suction valve It is characterized in that it is connected upstream from the suction valve via the leak passage. Moreover, the invention of Claim 2 is provided with the leak path in the toilet seat main body of a suction valve. Furthermore, the invention described in claim 3 is provided with a pressure rise time adjusting device in the configuration of the invention according to claim 1.

Therefore, in the invention according to claim 1, the pump internal pressure enters the pump chamber through the clearance between the piston and the cylinder at the time of pump stoppage, and is discharged from the upstream side of the intake valve via the leak passage therefrom. That is, the clearance between the piston and the cylinder, the pump chamber, and the leak passage are leak paths, and the pump internal pressure can be reduced within a predetermined time. In addition, the invention described in claim 2 is provided with a leak passage in the toilet seat body of the intake valve, which facilitates manufacture. Moreover, the kinematic resistance of the leak passage at the time of pump driving is large, and the amount of running away from the pump chamber at that time can be reduced.

The invention described in Claim 3 is an example in which a mechanical pressure rise time adjustment device is attached, in which an internal pressure of a pump and a gap between a piston and a cylinder are stopped at the time of stopping in an electronic pump in which a volume change occurs in the initial stage of the pump driving to loosen the pressure. The pump may be discharged from the leak chamber formed from the pump chamber and the leak passage, so that the attached pressure rise time adjusting device may function. This pressure rise time adjustment device does not require the installation of a leak hole in the pressure piston for moving only by volume change.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described by drawing. In FIG. 1 and FIG. 2, the electromagnetic pump 1 has the interruption current (pulse wire) impregnated in the case 4 formed with magnetic materials, such as iron, and has the electromagnetic coil 2. As shown in FIG. The electromagnetic coil 2 is formed by winding an electric wire around a resin bobbin 3. A through hole formed through the center of the bobbin 3 is fitted with a non-magnetic guide pipe 5 made of metal. have. Moreover, the upper board 6 and the lower board 7 are arrange | positioned at the upper end and the lower end of the bobbin 3, and comprise the magnetic circuit like the said case 4.

A magnetic rod 8 is disposed above the guide pipe 5, and the lower end of the guide pipe 5 is tightly fitted to the pump body 10 via an O-ring 9. The magnetic rod 8 is formed as a magnetic material such as iron, and almost the lower half of the magnetic rod 8 is sandwiched in the electric guide pipe 5 via the O-ring 11, and the magnetic rod 8 The remaining half of the < RTI ID = 0.0 >) < / RTI > is fitted to the fuselage portion 58 of the discharge joint 56 described below via the O-ring 12, and the hole 13 penetrates in the longitudinal direction therein.

The electromagnetic plunger 15 is formed in a substantially cylindrical shape by a magnetic material such as iron, and is formed in the electromagnetic plunger operating chamber 19 formed in the electric guide pipe 5 by the upper spring 16 and the lower spring 17. It is supported to slide. The electromagnetic plunger operating chamber 19 is divided into an upper spring chamber 19a and a lower spring 19b by the electromagnetic plunger 15. The hole 20 is drilled in the electromagnetic plunger 15 in the axial direction, and the constant spring chamber 19a and the lower spring chamber 19b communicate with each other. In addition, the piston 21 is fixed to the lower portion of the electromagnetic plunger 15.

The piston 21 is inserted into the cylindrical cylinder 24 sandwiched through the O-ring 23 in the hole formed in the pump body 10, and reciprocates in accordance with the reciprocating motion of the electromagnetic plunger 15. In addition, the cylinder 24 is inserted into the hole 22 communicating with the electromagnetic plunger operation chamber 19 formed in the pump body 10, so that the flange 25 formed on the outer circumference at the intermediate longitudinal length of the pump body 10 is provided. It is engaged via the O-ring 23. Thus, the flange 25 also serves to run along the lower end of the lower spring 17.

The pump chamber 27 is a space defined by the pump body 10 and the front end of the piston 21 and the suction valve 28 and the discharge valve 29 to be described below, and is formed by the reciprocating motion of the piston 21. The volume is changed to perform the pumping operation in cooperation with the intake valve 28 and the discharge valve 29. Specifically, when the piston 21 rises, the volume of the pump chamber 27 expands and the pump chamber 27 becomes negative pressure, the suction valve 28 opens to suck the fluid (fuel) from the suction hole 30. If the volume of the pump chamber 27 decreases by lowering the piston 21 and the pump chamber 27 is at a constant pressure, the discharge valve 29 is opened to discharge the fuel.

The suction valve 28 and the discharge valve 29 are coupled to the toilet body 28a and 29a, and the suction valve 31 is formed by integrating the cap 31 into the toilet body 29a on the discharge side. 32 is screwed into the forming hole 33 in the pump body 10. The flow path between the suction valve 28 and the discharge valve 29 communicates with the pump chamber 27. 28b and 29b are springs. In addition, the flow path after the discharge valve 29 communicates with the electromagnetic plunger operating chamber 19 via the formation hole 35 in the main body 10.

The leak passage 36 is provided around the toilet seat body 28c attached to the toilet seat body 28a, specifically, smaller than the hole of the toilet seat body 28a for inserting the diameter of the toilet seat body 28c. At the same time, the annular sphere 28d formed on the outer periphery and the annular sphere 28d communicate with each other, and the vertical hole 28f is configured as a radial hole 28e for connection. The clearance of the hole of the toilet seat body 28c and the toilet seat body 28a is about 10 micrometers, and since the leak path 36 is long, at the time of pump driving (the direction of a flow which changes 50 to 60 times per minute), The kinematic resistance of the fluid is large and the amount flowing out of the pump chamber 27 is small. In addition, when the pump is stopped, the pump is unidirectional without fluctuation in the flow direction of the fluid, and the passage resistance is small, and the internal pressure flows quickly (about 2 seconds).

The discharge joint 56 has a main body 57 and a fuselage 58 connected thereto, and as described above, the fuselage 58 is sandwiched in the bobbin 3 and the upper portion of the magnetic rod 8. Is stuck. In addition, the solenoid valve accommodating chamber 59 is formed in the fuselage part 58, and the solenoid valve 60 is accommodated in the solenoid valve accommodating chamber 59, pressed by a spring 61, and discharged to a discharge hole ( 62 is turned off (not energized), and when it is energized, the discharge hole 62 is opened by being pulled against the spring 61 on the magnetic rod 8 side.

As described above, when the pulse current having a predetermined number of pulses (50 to 60 times) is applied to the electromagnetic pump 1 and the electromagnetic coil 2 is excited, magnetic force is generated in the magnetic rod 8, The plunger 15 is sucked against the upper spring 16 and the repulsive energy is stored in the upper spring 16. When the electromagnetic coil 2 is extinguished, the magnetic attraction force is extinguished and returns downward as the repulsive energy of the upper spring 16. By this repetition, the electron plunger 15 is reciprocated. In addition, the electromagnetic pump 1 is a smoke-like type having looseness at start-up, and a well-known technique is adopted in which the duty ratio of the pulse is changed.

The reciprocating motion of the electromagnetic plunger 15 is transmitted to the piston 21 and reciprocated in the cylinder 24. When the piston 21 is reciprocated, i.e., displaced downward, the volume of the pump chamber 27 is enlarged, whereby the negative pressure is opened to open the suction valve 28 and suck the fluid in the suction hole 30. In addition, when displaced upward, the volume of the pump chamber 27 is reduced, whereby it becomes a compression pressure (static pressure), thereby opening the discharge valve 29 to discharge the fluid into the electromagnetic plunger operating chamber 19. In addition, since the leak passage 36 has a pressure fluctuation of 50 to 60 times per minute when the pump is driven, the flow direction also fluctuates, thereby increasing the kinematic resistance of the leak passage 36, so that the amount of runaway is small.

The fluid flowing into the solenoid plunger operating chamber 19 discharged from the solenoid valve is smoothed in an accumulator (not shown), and is regulated to a predetermined pressure as a relief valve (not shown), and opens through the open solenoid valve 60. Is discharged from the discharge hole 62 to the external device.

When the flow of the pulse current to the electromagnetic coil 2 is interrupted, the reciprocating motion of the electromagnetic plunger and the piston 21 is stopped and the solenoid valve 60 is seated on the toilet seat and the discharge hole 62 is turned off. That is, the fluid of high pressure (for example, 7 kg / cm <2>) is turned off from the intake valve 28 which is a pump downstream to the solenoid valve 60, especially in the electromagnetic plunger operation chamber 19. FIG. This high pressure fluid passes between the piston 21 and the cylinder 24, reaches the pump chamber 27, flows out of the upstream side from the intake valve via the leak passage 36, and flows the internal pressure to the suction side. It can be spilled. That is, the piston 21 which becomes a leakage path is a movable member, and improves reliability by performing the low copper cleaning action which is hard to attach dust.

This outflow time is about 2 to 3 seconds, and can be controlled by adjusting the cross section area of the piston 21 and the cylinder 24, the cross-sectional area of the leak passage 36, and the length of the cylinder 24 suitably. Therefore, when the internal pressure decreases at about 2 to 3 seconds after the pump stops and the pump is driven again, the discharge pressure is loosely increased by changing the duty ratio of the pulse current applied to the electromagnetic coil 2 to reach a normal pressure. This could contribute to perfection in petroleum fuel equipment.

Although the example is that the shutoff valve is a solenoid valve 60 that is opened and closed by the magnetic attraction force of the magnetic rod 8, it is provided with an electromagnetic coil for an independent solenoid valve. The technique shown in -14635, that is, a valve which turns off the valve at the change of the position of the electromagnetic plunger when the pump is stopped, may be used.

In FIG. 3, unlike the embodiment mentioned above, the mechanical pressure rise time adjusting device 64 for softening is shown. The pressure rise time adjusting device 64 includes a pressure rise time adjusting cylinder (hereinafter referred to as a pressure cylinder) 66 inserted into the forming hole 65 in the pump main body 10, and the pressure tank cylinder 66. And a spring 68 for pressing the piston for the pressure tank 67 and a cylinder 69 for the pressure tank, and a partition 69 in the inner center thereof. The front chamber 70a and the rear chamber 70b are formed, respectively. The through hole 71 penetrates through the partition wall 69 to communicate the two chambers 70a and 70b.

The filter 72 is accommodated in the front chamber 70a and communicates with the downstream side of the discharge valve 29 via the communication hole 73 in the hole 74 formed in the cylinder for pressure vessel 66. Moreover, the cylinder for pressure tank 66 is arrange | positioned so that a sliding material may be provided in the electric rear chamber 70b, and it is urged by the spring 67, and this cylinder for pressure tank 66 opposes the pressure of the downstream side of a discharge valve. Reference numeral 75 denotes a stopper in which a spacer for stroke adjustment can be arranged. In addition, the pressure cylinder 66 and the filter 72 is mounted to the pump main body 10 by pushing the attachment plate 36 to which the accumulator 47 is attached. The cylinder for pressure vessel 66 is provided with a leak hole and the like.

When the pump drive is started, such a pressure rise time adjusting device 64 is supplied with a fluid downstream of the discharge valve 29, that is, a high pressure, through the communication hole 73, and enters the first chamber 70a. The pressure is applied to the pressure piston 67 through the through hole 71. When the pressure vessel piston 67 reaches a predetermined pressure (2 to 3 kg / cm 2), the displacement starts to increase the volume of the front chamber 70a. For example, when the pressure rises to 5 to 6 kg / cm 2, the expansion of the volume is stopped. It acts and slows the pressure rise at the beginning of the drive. In the pressure rise time adjusting device 64 of this configuration, the pump internal pressure is provided through the clearance between the piston 21 and the cylinder 24, the pump chamber 27, and the leak passage 36 as described above at the time of stopping the pump driving. Since this flows out and can be reduced to about atmospheric pressure in about 2-3 seconds, the piston 67 will be returned by the spring 68, and it will actuate again when the pump is restarted. Since other parts are the same as in the above-described embodiment, the same parts are denoted by the same reference numerals and description thereof will be omitted.

In FIG. 4 and FIG. 5, the 2nd Embodiment of this invention is shown, and is connected to the electromagnetic plunger 15, and the discharge valve 80 is provided in the sliding piston 79 in the cylinder 78. In FIG. At the same time, the invention can also be employed in an electromagnetic pump having a structure in which a suction valve 82 is provided in the cylinder 78.

That is, the piston 79 is integrally attached to the electromagnetic plunger 15 and slides together, but a vertical hole 83 is formed in the piston 79, and a discharge valve (above) of the vertical hole 83 is formed. 80 is provided and urged as a spring 84. This piston 79 is arrange | positioned so that it may slide in the cylinder 78 mentioned later.

The cylinder 78 is relatively long and is inserted into the formation hole 22a in the pump main body 10, and the flange 85 is locked to the main body 10 via the O-ring 86. In addition, the flange 85 also serves to support the lower end of the lower spring (17). The piston 79 is not stopped below the cylinder 78, and an absorption valve 82 is disposed.

The suction valve 82 is arranged in the cylinder 78 like the toilet seat body 82c of the suction valve, is urged as a spring 78b, and sits on the toilet seat body 82c. The space between the suction valve 82 and the discharge valve 80 is a pump chamber 87.

The leak passage 89 is provided around the toilet seat body 90 of the suction valve attached to the cylinder 78, and specifically, is smaller than the cylinder 78 into which the diameter of the toilet seat body 82c is inserted. At the same time, the annular sphere 82d formed on the outer periphery and the annular sphere 82d communicate with each other and are configured as a radial hole 82e connected to the longitudinal hole 28F. Since the clearance of the leak passage 89 is about several tens of micrometers, and the leak passage 89 is long, the dynamic viscosity resistance of a fluid is large at the time of pump driving (the flow direction changes 50 to 60 times per minute), The amount of outflow from the pump chamber 87 is small. In addition, when the pump is stopped, there is no fluctuation in the flow direction of the fluid, it is one-way, the passage resistance is small, and the internal pressure flows out quickly (around 2 seconds). As mentioned above, although 2nd Embodiment was described, the part same as the said Example attaches | subjects the same code | symbol, and abbreviate | omits description.

The second embodiment tanker as described above also applies a pulse current having a predetermined number of pulses (50 to 60 times), and when the electromagnetic coil 2 is excited, a magnetic force is generated in the magnetic rod 8 to generate the electromagnetic plunger 15. ) Is sucked against the upper spring 16, so that the repulsive energy is stored in the upper spring 16. Thus, when the electromagnetic coil 2 is demagnetized, the magnetic attraction force disappears and returns downward as the repulsive energy of the upper spring 16. By this repetition, the electronic plunger 15 reciprocates. In addition, the electromagnetic pump 1 is a smoke-like type having looseness at start-up, and a known technique performed by changing the duty ratio of pulses is employed.

Then, the reciprocating motion of the electromagnetic plunger 15 is transmitted to the piston 79 to reciprocate in the cylinder 24. When the piston 79 is reciprocated, i.e., displaced downward, the volume of the pump chamber 87 expands, and thus becomes negative pressure to open the suction valve 82 and suck the fluid in the suction hole 30. Then, when displaced upward, the volume of the pump chamber 87 is reduced, so that it becomes a compression pressure (static pressure), and the discharge valve 80 is opened to discharge the fluid into the electromagnetic plunger operating chamber 19. In addition, the leak passage 89 has a pressure fluctuation of 50 to 60 times per minute when the pump is driven. As a result, the flow passage also fluctuates. The leak passage 89 has a large kinematic resistance and a small amount of leakage.

The fluid discharged from the discharge valve and flowed into the electromagnetic plunger operating chamber 19 is smoothed by an accumulator (not shown), and is regulated to a predetermined pressure as a relief valve (not shown), so that the solenoid valve 60 is opened. In the discharge hole 62 is sent to the external device.

When the flow of the pulse current to the electromagnetic coil 2 is blocked, the reciprocating motion of the electromagnetic plunger and the piston 79 is stopped, and the solenoid valve 60 is seated on the toilet seat and the discharge hole 62 is turned off. That is, the fluid of the high pressure (for example, 7 kg / cm <2>) is submerged in the solenoid valve 60 downstream from the suction valve 82 which is inside a pump, especially in the electromagnetic plunger operation chamber 19. As shown in FIG. This high pressure fluid passes between the piston 79 and the cylinder 78 to reach the pump chamber 27, and thus flows out of the upstream side of the intake valve 89 through the leak passage 89, so that the internal pressure flows out to the suction side. I can do it. That is, the piston 79 which becomes a leakage path is a movable member, and since it performs the automatic cleaning action which is hard to attach dust well, it raises reliability.

This outflow time is about 2 to 3 seconds, and it can control by adjusting the clearance of the piston 79 and the cylinder 78, and the cross-sectional area and length of the leak path 89 suitably. Therefore, when the internal pressure decreases about 2 to 3 seconds after the pump stops, and the pump is driven again, the discharge pressure rises loosely by changing the duty ratio of the pulse current applied to the electromagnetic coil 2 to reach a normal pressure. It can contribute to perfection in petroleum fuel equipment.

As described above, according to the invention of claim 1, the pressure (high pressure) in the pump can escape to the suction side through the gap between the piston and the cylinder, the pump chamber and the leak passage at the time of pump stop, so that the internal pressure of the pump decreases within a predetermined time. You can.

According to the invention of claim 2, since the leak passage is formed in the toilet seat body of the intake valve, the production is simple, and the length and the cross-sectional area of the leak passage are changed in the shape of the toilet seat body of the suction valve. ) Can be changed.

According to the invention described in claim 3, the mechanical pressure rise time adjustment device is attached, and the internal pressure of the pump at the time of stopping is increased in the electromagnetic pump which gives a volume change in the initial stage of pump operation and slows down the pressure rise. It can be discharged from the gap between the piston and cylinder, the pump chamber and the leak passage, and the attached pressure rise time adjustment device can be operated.

Claims (3)

The electromagnetic coil is reciprocated by the tradition of intermittent current and the piston is reciprocated in the cylinder in conjunction with the electromagnetic plunger. An electromagnetic pump having a shut-off valve for turning off the discharge hole at a time, wherein the pump chamber in which a tip of the piston forms a part is connected upstream of the intake valve via a leak passage bypassing the intake valve. Electronic pump. The electromagnetic pump according to claim 1, wherein the leak passage is formed in the toilet seat body of the intake valve. The electronic pump according to claim 1, wherein a pressure rise time adjusting device is attached.