JPH075257Y2 - Electromagnetic pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an electromagnetic pump used, for example, for feeding fuel from a fuel tank to a combustion burner in an oil hot air heater.

(Prior Art) Conventionally, an electromagnetic pump having the following structure has been generally used for fuel supply in an oil hot air heater.

That is, this type of electromagnetic pump, as shown in FIGS.
A cylinder 3 made of a non-magnetic material is inserted into the center of an electromagnetic coil 2 held by a U-shaped yoke 1 made of a magnetic material, and a pair of annular magnetic poles 4 and 5 are arranged outside the cylinder 3. In addition, a plunger 8 supported by springs 6 and 7 from both ends is housed inside the cylinder 3, and the plunger 8 is
A liquid passage 9 penetrating in the axial direction and a check valve for suction 10 composed of a valve seat member 10a, a valve body 10b and a spring 10c are internally provided therein, and a passage on the discharge side of the cylinder 3 is further provided. Similarly, the check valve for discharge 11 including the valve seat member 11a, the valve body 11b and the spring 11c is provided.

According to such a structure, when the electromagnetic coil 2 is energized, the plunger 8 is moved toward the discharge side against the spring 6 by the force generated by the magnetic field generated between the pair of annular magnetic poles 4, 5.
Further, when the energization of the electromagnetic coil 2 is stopped, the magnetic field is deenergized, so that the plunger 8 is returned to the initial position by the spring 6. When the plunger 8 moves forward, the suction check valve 10 is closed, so that the liquid in the pump chamber 12 provided on the discharge side of the plunger 8 is pressurized to push the discharge check valve 11. It is delivered to the outside of the pump while opening, and when the plunger 8 returns,
Since the discharge check valve 11 is closed and the pressure in the pump chamber 12 is reduced, the suction check valve 10 is opened and the liquid is stored in the pump chamber 12
By inflowing into the inside and repeating this, suction and discharge operations as a pump are continuously performed. still,
In FIGS. 4 and 5, 13 is a terminal of the electromagnetic coil 2 and 14 is a mounting hole provided in the yoke 1.

(Problems to be Solved by the Invention) By the way, the conventional electromagnetic pump as described above has many components, and the assembly work is complicated accordingly. That is, in the case of this electromagnetic pump, when mounting the cylinder 3 and the annular magnetic poles 4 and 5 on the yoke 1, first, the lower annular magnetic pole 5 is provided with the step 5a provided on the magnetic pole.
It is provided near the lower end of the cylinder 3 by inserting it into the center of the electromagnetic coil 2 until it abuts the lower side 1b, and then inserting the cylinder 3 into the annular magnetic pole 5 from below until it penetrates the upper side 1a of the yoke 1. The step portion 3a is pressed against the lower end surface of the annular magnetic pole 5, and then a suction plug 15 made of a synthetic resin is press-fitted to the outside of the annular magnetic pole 5 to join them, and in this state, the inside of the cylinder 3 A discharge plug in which a plunger 8, springs 6, 7 and the like are incorporated in the cylinder 3, an upper annular magnetic pole 4 is fitted to a portion of the cylinder 3 projecting from the upper side 1a of the yoke 1, and a check valve 11 for discharge is incorporated. 16 is fixed by screwing it into the threaded portion 3b provided in the cylinder 3, and finally the rotation stopper metal fitting 17 is fitted on the outside of the discharge plug 16 and is fixed to the upper side portion 1a of the yoke 1 by the screw 18. It had a fixed structure.

Thus, in the conventional electromagnetic pump, in addition to the basic components such as the yoke 1, the electromagnetic coil 2, the cylinder 3, etc., the suction pump for receiving the pair of upper and lower annular magnetic poles 4, 5 or the spring 7 for supporting the plunger 8. Parts such as the plug 15 were required, and the number of parts was increased, and accordingly, the assembly work was remarkably complicated. And, in particular, the suction plug 15 is usually made of a synthetic resin and is usually produced in a small amount in various types according to the specifications of the pump such as the suction head, and the molding die requires a great cost. It was.

(Means for Solving Problems) The present invention addresses the above situation in the related art, and eliminates the number of parts in this type of electromagnetic pump, particularly the intake plug as a part that also serves as a spring receiver. The present invention is intended to remarkably facilitate the assembling work, and is characterized by having the following configuration to achieve this purpose.

That is, the electromagnetic pump according to the present invention has an electromagnetic coil sandwiched between the upper and lower sides of a U-shaped yoke made of a magnetic material.
A cylinder made of a non-magnetic material is inserted through through holes provided on the upper and lower sides of the yoke, and a liquid passage penetrating in the axial direction and a suction opening for opening and closing the passage are provided in the cylinder. A plunger with a built-in check valve is housed therein, and the plunger is elastically supported by a first spring and a second spring whose upper and lower end surfaces are respectively arranged in a crocodile, and further protrudes upward from the upper side of the yoke of the cylinder. In an electromagnetic pump having a discharge plug at a portion to be formed, a pipe expanding portion is formed at a portion protruding upward from the upper side portion of the yoke in the cylinder,
Further, by fitting the discharge plug onto the expanded portion, the expanded portion is sandwiched between the discharge plug and the upper side portion of the yoke to fix the cylinder, and the filter is attached to the lower end portion of the cylinder. It is characterized by that.

In addition, in the cylinder, the second portion is provided at a predetermined portion of a lower portion.
It is better to form a reduced diameter portion for receiving the spring.

(Operation) According to the above configuration, when assembling the electromagnetic pump, the second spring, which is preliminarily set in the cylinder from the top, the plunger having the check valve for suction therein, and the spring shown in FIG.
Next, the cylinder is inserted from the through hole in the upper side of the yoke through the electromagnetic coil into the through hole in the lower side of the yoke, and the discharge plug is externally fitted to the expanded portion formed at the upper part of the cylinder. If fixed to the upper side of the yoke, the expanded pipe portion is sandwiched between the upper side of the yoke and the discharge plug, and the cylinder is coupled to the yoke.
Further, by mounting the filter directly on the lower end of the cylinder, the entire electromagnetic pump can be assembled by a simple operation without the need for the conventional suction plug.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical cross-sectional view of an electromagnetic pump 20 according to the present embodiment. The electromagnetic pump 20 has a U-shaped yoke 21 made of a magnetic material as a main component, an electromagnetic coil 22, and a thin non-magnetic material. And a cylinder 23 made of a magnetic material. Above electromagnetic coil 22
Is wound around the coil bobbin 24
It is held between the upper and lower sides 21a and 21b of the cylinder 21, and the cylinder 23 has the through holes 21a 'and 21b' formed in the sides 21a and 21b and the electromagnetic coil 22 (coil bobbin 2).
4) is inserted inside.

On the other hand, a plunger 25 is reciprocally housed inside the cylinder 23. A liquid passage 26 penetrating in the axial direction of the plunger 25 is provided in the plunger 25, and the passage 26 has a valve seat member 27a attached to the lower end portion of the plunger 25 and the member 27a. A check valve 27 for suction is provided, which is composed of a ball-shaped valve body 27b arranged on the upper surface of and a spring 27c that presses the valve body 27b toward the valve seat member 27a.

Further, the space above the plunger 25 in the upper part of the cylinder 23 is a pump chamber 28 that is in constant communication with the liquid passage 26 of the plunger 25, and the upper side 21a of the yoke 21 at the upper end of the cylinder 23. A discharge plug 29 having a discharge hole 29a is externally fitted to a portion protruding further upward, and in the discharge plug 29, a valve seat member 30a, a valve element 30b arranged on the upper surface of the member 30a, and A discharge check valve 30 including a spring 30c for pressing the valve body 30b toward the valve seat member 30a is provided. A first spring 31 for urging the plunger 25 downward is provided between the lower end surface of the valve seat member 30a constituting the discharge check valve 30 and the upper end surface of the plunger 25. A second spring 32 for urging the plunger 25 upward is interposed between the spring receiving reduced diameter portion 23a formed in the lower portion of the cylinder 23 and the lower end surface of the plunger 25, and these springs 31, 32 are provided. Plunger 25 is elastically supported in cylinder 23 by. A filter 33 is attached to the lower end of the cylinder 23.

However, in this electromagnetic pump 20, at a position protruding above the upper side portion 21a of the yoke 21 in the cylinder 23,
A bead portion 23b formed by expanding the cylinder 23 in a ring shape is provided, and the discharge plug 29 is externally fitted to the upper end portion of the cylinder 23 so that the bead portion 23b is sandwiched between the bead portion 23b and the upper side portion 21a of the yoke 21. ing. The rotation stopper member 34 is fitted to the lower end portion of the discharge plug 29, and the pressing member 35 having the cutout portion 35a is laterally formed in the small diameter portion 29b formed immediately above the fitting position. This pressing member 35 is engaged.
The above-mentioned rotation stopping member 34 is fixed to the upper side portion 21a of the yoke 21 by means of screws 36.

Next, the operation of this embodiment will be described. First, the electromagnetic coil
When 22 is not energized, the plunger 25 housed in the cylinder 23 is pressed from above and below by the first and second springs 31 and 32 and is elastically held at the initial position shown in the figure. When the electromagnetic coil 22 is energized in this state, the coil 22 is excited. At this time, the cylinder through hole 21a 'in the upper and lower side portions 21a, 21b of the yoke 21 made of a magnetic material. The inner edge portions of 21b 'serve as magnetic poles forming a magnetic path to generate a magnetic field in the cylinder 23 made of a non-magnetic material, and this magnetic field exerts a force that attracts the plunger 25 in the cylinder 23 upward. By this force, the plunger 25 is moved to the discharge side against the upper first spring 31. Then, at this time, since the suction check valve 27 in the plunger 25 is closed, the pressure in the pump chamber 28 above the plunger 27 increases, and the liquid in the chamber 28 causes the discharge check valve 30 to operate. It is pushed open and is delivered to the outside of the pump 20 through the hole 29a of the discharge plug 29. Further, when the energization of the electromagnetic coil 22 is stopped, the magnetic field generated in the cylinder 23 or the magnetic force acting on the plunger 25 is deenergized, so that the plunger 25 is initialized by the first spring 31. Although it will be returned to the position, in this case, since the pressure inside the pump chamber 28 above the plunger 25 is reduced, the check valve for discharge 30 is closed and the check valve for suction provided in the plunger 25 is closed. The valve 27 is opened, and the liquid is sucked from the filter 33 into the pump chamber 28 through the check valve 27 and the liquid passage 26. Then, by repeating the above operation, the liquid suction and discharge operations are continuously performed, and the liquid is transferred from the lower side to the upper side.

However, in this electromagnetic pump 20, the cylinder 23
The bead 23b provided on the upper side of the
1a and a discharge plug 29 fitted onto the upper end of the cylinder 23, and the discharge plug 29 is held between the discharge plug 29 and the discharge plug 29.
34, the pressing member 35, and the screw 36
Since it is fixed to a, the cylinder 23
Is bound to. Therefore, when assembling the pump 20,
The cylinder 23 is inserted downward from the through hole 21a ′ of the upper side portion 21a of the yoke 21 to insert the cylinder 23 inside the electromagnetic coil 22 and the lower side portion of the yoke 21.
21b 'through the through hole 21b', and the cylinder 23
After the plunger 25, the first and second springs 31, 32, etc. are installed in the cylinder 23, a discharge plug 29 having a check valve 30 for discharge is installed on the upper end of the cylinder 23, and the cylinder 23 is fitted. Bead part 23b
By clamping the discharge plug 29 to the upper side portion 21a of the yoke 21 by the pressing member 35 or the like, the cylinder 23 is coupled to the yoke 21. By mounting the filter 33 on the lower end of the cylinder 23, the entire electromagnetic pump 20 is assembled and integrated. Therefore, the synthetic resin suction plug press-fitted into the lower end of the cylinder and the press-fitting work of the plug, which have been conventionally required, are unnecessary. In this electromagnetic pump 20, since the inner edge portions of the cylinder through holes 21a ', 21b' in the lower side portions 21a, 21b of the yoke 21 are used as magnetic poles, a pair of upper and lower annular magnetic poles in the related art are not necessary. It will be.

Here, since the bead portion 23b is provided on the upper portion of the cylinder 23 and the upper portion of the cylinder 23 is coupled to the upper side portion 21a of the yoke 21, the plunger 25 housed in the cylinder 23 is The positional relationship between the upper end portion and the yoke upper side portion 21a is always maintained properly regardless of thermal deformation of the electromagnetic coil 22 or the like. As a result, the yoke upper side 21a
The magnetic force acting from the inner edge of the through hole 21a 'to the upper end of the plunger 25 is stabilized, and the plunger 25 always reciprocates satisfactorily to stabilize the discharge flow rate.

FIG. 3 shows another embodiment of the present invention. In the electromagnetic pump 40 shown in this embodiment, a portion of the upper end portion of the cylinder 43 protruding upward from the upper side portion 41a of the yoke 41 has a large diameter. The discharge plug 49 is externally fitted to the large diameter portion 43b. Then, similarly to the above-mentioned embodiment, the discharge plug 49 is fixed to the upper side portion 41a of the yoke 41 by using the rotation stopping member 54, the pressing member 55 and the screw 56, and other configurations are also the same as the embodiment. Is the same as. Therefore, also in this embodiment, the number of parts is reduced and the assembling is facilitated as compared with the conventional one.

(Effects of the Invention) As described above, the electromagnetic pump according to the present invention is provided with the expanding portion such as the bead portion or the large diameter portion on the upper portion of the cylinder accommodating the plunger, and the discharge plug is externally fitted to the expanding portion. Since the structure is such that it is fixed to the upper side of the yoke and the filter is directly attached to the lower end of the cylinder, the synthetic resin suction plug that was conventionally used for connecting the cylinder to the yoke is not required. Accordingly, a large die cost is saved when various types of the suction plugs are produced in small quantities according to the specifications such as suction head.
The electromagnetic pump of the present invention can be manufactured with different suction heads only by changing the length of the cylinder. If a reduced diameter portion is provided at a predetermined portion projecting downward from the lower side portion of the yoke of the cylinder and the second spring is received by the reduced diameter portion, the configuration is further simplified and the assembling work is significantly facilitated. Therefore, the production cost will be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an electromagnetic pump showing an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a vertical sectional view of an electromagnetic pump showing another embodiment, and FIG. FIG. 5 is a plan view showing the electromagnetic pump in a vertical sectional view. 20,40 …… Electromagnetic pump, 21,41 …… Yoke, 21a, 41a ……
Upper side, 21b ... Lower side, 21a ', 21b' ... Penetration hole, 22 ...
… Electromagnetic coil, 23,43 …… Cylinder, 23b, 43b …… Expansion part (bead part, large diameter part), 29,49 …… Discharge plug, 33 ……
filter.

Front page continuation (72) Inventor Kazunori Fukuzoe 7-15 Kita-Kamei-cho, Yao-shi, Osaka Inside Silver Industry Co., Ltd. (56) References 56-42443 (JP, Y2)

Claims (2)

[Scope of utility model registration request] 1. A non-magnetic material is inserted into an electromagnetic coil sandwiched between the upper and lower sides of a U-shaped yoke made of a magnetic material through through-holes formed in the upper and lower sides of the yoke, respectively. A cylinder is inserted, and a plunger having a liquid passage penetrating in the axial direction and a suction check valve for opening and closing the passage is housed in the cylinder. In an electromagnetic pump elastically supported by a first spring and a second spring respectively disposed in the cylinder, and further provided with a discharge plug in a portion projecting upward from the upper side of the yoke of the cylinder, the upper side of the yoke of the cylinder is provided. An expanded pipe portion is formed at a position projecting upward from the pipe, and an upper discharge plug is externally fitted to the expanded pipe portion so that the expanded pipe portion is sandwiched between the discharge plug and the upper side portion of the yoke to fix the cylinder. Then both , Electromagnetic pump, characterized in that allowed mounting the filter to the lower end of the cylinder. 2. The electromagnetic pump according to claim 1, wherein a lower diameter portion of the cylinder has a reduced diameter portion for receiving a second spring at a predetermined portion of the ring.