JP3090496U - Electromagnetic pump - Google Patents

Abstract

(57) [Problem] To provide an electromagnetic pump having excellent pump efficiency and quiet operation noise. SOLUTION: A movable iron core 5 which is moved by exciting a coil, a return spring 6 of the movable iron core, a diaphragm 8 attached to an end of the movable iron core, a suction port 11 and a discharge port 15.
And a base 9 to which the diaphragm 8 is attached.
In the electromagnetic pump in which the pump chamber 10 is formed by the base 9 and the base 9, the base 9 is provided with a discharge hole 18 that opens to the pump chamber 10 so as to face the moving end of the movable iron core 5. The discharge hole 18 is connected to the check valve 16 of the discharge port through the discharge passage 19.
The elastic plate 20 is provided at at least one of the periphery of the discharge hole 18 and the end of the movable core 5.
When the movable iron core 5 is attracted by the coil 2 and moves in the suction direction, the opening of the discharge hole 18 is delayed, and the discharge hole 18 is closed at the end of the movement of the movable iron core 5 in the discharge direction.

Description

[Detailed description of the invention]

[0001]

[Technology to which the invention belongs]

 The present invention relates to a configuration of an electromagnetic pump using a diaphragm, particularly an electromagnetic pump used for a water tank or the like.

[0002]

[Prior art]

 Conventionally, such an electromagnetic pump has a pump chamber formed by a diaphragm attached to a movable iron core as disclosed in, for example, Japanese Patent Application Laid-Open No. H10-184553, and a check valve is provided on the bottom or side surface of the pump chamber. When the fluid is sucked into the pump chamber, the check valve at the suction port is opened and the check valve at the discharge port is closed. In this case, the check valve at the suction port is closed by the pressure of the fluid, and the check valve at the discharge port is opened to discharge the fluid.

An example of such an electromagnetic pump is shown in FIG. 3, in which a diaphragm 33 attached to a movable iron core 32 operated by a coil 31 of an electromagnetic device forms a pump chamber 30. A check valve 35 at the suction port 34 and a check valve 37 at the discharge port 36 are provided. When the movable core 32 is attracted and moved to the fixed core 38 by excitation of the coil 31 of the electromagnetic device, and the volume of the pump chamber 30 is increased by the diaphragm 33 attached to the end of the movable core, the movable core 32 is provided on the side wall of the pump chamber 30. The check valve 35 of the suction port 34 is opened, the check valve 37 of the discharge port 36 is sucked and closed, and fluid is sucked from the suction port 34 into the pump chamber 30. When the power supply to the coil 31 is cut off and the movable iron core 32 is lowered by the return spring 39, the fluid in the pump chamber 10 closes the check valve 35 by pressure, and pushes and opens the check valve 37 of the discharge port 36 to discharge. Is done.

[0004]

[Problems to be solved by the invention]

 As described above, since the check valves at the inlet and the discharge port are provided directly in the pump chamber, the check valve at the inlet is opened and the check valve at the discharge port is opened when the fluid is sucked. Although it is closed, vibration occurs due to sudden movement of the movable iron core and the diaphragm, and the pressure change in the pump chamber also oscillates. There are drawbacks such as the liquid flowing backward and the suction from the suction port not being carried out smoothly, which reduces the pump efficiency. The present invention eliminates the vibration of the check valve at the time of suction of fluid, increases the pump effect, and provides an electromagnetic pump with low vibration noise.

[0005]

[Means for Solving the Problems]

 For this reason, an electromagnetic coil, a movable core that moves in the axial direction by feeding power to the electromagnetic coil, a return spring of the movable core, a diaphragm attached to an end of the movable core, and an inlet and an outlet are attached. A pump chamber is formed by the diaphragm and the base. The electromagnetic pump, which sucks and discharges fluid into and from the pump chamber by moving the movable core, discharges the pump at a position facing the movable core end of the pump chamber. It has a discharge port that communicates with the check valve at the outlet, and an elastic plate that opens and closes the discharge port in relation to the operation of the movable iron core. The discharge port is opened with a slight time delay after the stop valve opens.

[0006] In addition, a cushioning material is provided on a check valve of the suction port and the discharge port provided on the base on a side where the valve is opened to eliminate the influence of vibration.

[0007]

【Example】

 This will be described below with reference to an embodiment shown in the drawings. In FIG. 1, reference numeral 1 denotes a casing, 2 denotes a coil, and 3 denotes a fixed iron core, and a nut 4 adjusts a mounting position with the coil 2. 5 is a movable core, 6 is a return spring, 7 is a cushion, 8 is a diaphragm having an outer peripheral edge fixed to a base 9 and a central portion attached to an end of the movable iron core, and forms a pump chamber 10. 11 is a suction port attached to the base 9, 12 is a check valve on the suction side, 13 is cushion material, 14 is a suction hole opened in the pump chamber 10, 15 is a discharge port attached to the base 9, and 16 is a discharge side. Is a check valve, 17 is a cushion material, and 18 is a discharge hole opened in the pump chamber 10 and is opened at a position facing the end of the movable iron core 5. Reference numeral 19 denotes a discharge passage connecting the check valve 16 and the discharge hole 18, and reference numeral 20 denotes an elastic plate provided around the discharge hole 18.

When the coil 2 is excited, the movable iron core 5 rises against the return spring 6, pulls up the diaphragm 8 to increase the volume of the pump chamber 10, and opens the check valve 12 on the suction side to open the check valve 12. Although the fluid is sucked, when the diaphragm 8 is pulled up and the fluid starts to flow in, the elastic plate 20 is elastic and keeps contact with the end of the movable iron core 5 to close the discharge hole 18. Is not sucked into the pump chamber 10, the check valve 16 on the discharge side keeps the closed state, and the fluid is sucked from the suction port 11 as the volume of the pump chamber 10 changes. When the movable core 5 further moves up and its end is separated from the elastic plate 20, the discharge hole 18 is opened. However, the check valve 12 on the suction side is already opened, and the fluid has flowed into the pump chamber 20. Therefore, there is no vibration, and the check valve 16 is kept closed and does not open due to vibration or the like.

When the coil 2 is demagnetized and the movable core 5 is lowered by the return spring 6, the diaphragm 8 is pushed down, and the fluid in the pump chamber 20 closes the check valve 12, pushes and opens the check valve 16, and discharges the gas. It is discharged from 18 through a discharge passage 19. When the end of the movable iron core 5 comes into contact with the elastic plate 20, the discharge hole 18 is closed, and the remaining fluid is held in a state filled with the pump chamber 20, so that the next suction is smoothly performed. FIG. 2 shows a case in which the cushion plate 21 is attached to the end of the movable core 5 via a spring 22 instead of the elastic plate 20, and the discharge hole 18 is closed by the cushion plate 21, so that the case of FIG. Works in the same way as

[0010]

[Effect of the invention]

 As described above, in the present invention, in an electromagnetic pump in which a pump chamber is formed between a base and a movable iron core that is moved by excitation of a coil, a pump chamber is formed opposite to the moving end of the movable iron core. A discharge hole that is open and communicates with a check valve of the discharge port through a discharge passage is provided, and at least one of the periphery of the discharge hole and the end of the movable core is provided with an elastic plate so that the end of movement of the movable core in the discharge direction is provided. Since the discharge port is closed at the beginning and the discharge hole is opened with a time lag from the start of suction at the beginning of the movement of the movable core in the suction direction, the discharge is caused by the movement of the movable core and the diaphragm during the suction. This prevents the check valve on the side from opening and allows efficient suction of fluid.When discharge is completed, the discharge hole is closed, the check valve on the suction side is closed, and the pump chamber is closed tightly. Let the pombe Since the fluid is maintained in a state of filling the inside, next suction operation is smoothly performed, there is no need to use a priming effect of improving the Ponbu efficiency is obtained, et al.

Further, the elastic plate can reduce the impact on the base when the movable iron core is moved by the return spring. In addition, by providing the check valve with a cushion material, the occurrence of vibration can be reduced. An electromagnetic pump with quiet driving sound can be obtained.

[Brief description of the drawings]

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

FIG. 2 is a side sectional view of a main part showing another embodiment.

FIG. 3 is a side sectional view showing a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 casing 2 coil 3 fixed iron core 4 nut 5 movable iron core 6 return spring 7 cushion 8 diaphragm 9 base 10 pump chamber 11 suction port 12 check valve 13 cushion material 14 suction hole 15 discharge port 16 check valve 17 cushion material 18 discharge hole 19 Discharge passage 20 Elastic plate 21 Cushion plate 22 Pressing spring

Claims (2)

[Utility model registration claims] 1. An electromagnetic coil, a movable core moved by excitation of the electromagnetic coil, a return spring of the movable core, a diaphragm attached to an end of the movable core, and a base attached with a suction port and a discharge port. In the electromagnetic pump in which a pump chamber is formed by the diaphragm and the base, a discharge hole that opens in the pump chamber is provided in the base so as to face a moving end of the movable iron core, and the discharge hole is formed through a discharge port through a discharge passage. At the end of the movement of the movable core in the discharge direction at at least one of the periphery of the discharge hole and the end of the movable iron core, and closes the discharge hole at the end of the movement of the movable iron core in the suction direction. An electromagnetic pump comprising an elastic plate that delays the opening of a discharge hole. 2. The electromagnetic pump according to claim 1, wherein a check valve of the suction port and the discharge port provided on the base is mounted on a side where the valve is opened via a cushion material.