JP2012112364A - Solenoid pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solenoid pump which can efficiently suck and supply high pressure fluid by increasing the thrust of a movable member.SOLUTION: A plunger 10 is electro-magnetically driven and reciprocated to pressurize the fluid sucked from a suction port 5a to a prescribed pressure by opening and closing first and second valve bodies 14 and 16. The fluid is supplied to a pump chamber 4 to discharge the high pressure fluid on a prescribed quantity base from a discharge port 1a of a pump body 1.

Description

  The present invention relates to a solenoid pump used as a drive source for electronic equipment, medical equipment, analysis equipment, in-vehicle equipment, and the like, and more specifically, operation of sending and sucking fluid by reciprocating a mover by electromagnetic drive in a pump chamber. It is related with the solenoid pump which repeats.

  In a positive displacement pump in which a fluid is sent or sucked by a change in the volume of the pump chamber, for example, a mover provided so as to be able to reciprocate in a cylinder is reciprocated by electromagnetic drive to deliver fluid in the pump chamber and pump chamber The fluid is sucked in.

  In the pump body connected by the holding cylinder of the suction cylinder part and the discharge cylinder part, the piston and the piston receiving part are connected by the first and second valve bodies biased from the discharge cylinder part side toward the suction cylinder part side. A communicating channel is provided to be openable and closable. The first and second valve bodies are opened by the pressure difference generated in the holding cylinder by moving the piston to the suction cylinder side in the holding cylinder by electromagnetic drive, and a predetermined amount of fluid enters the holding cylinder from the suction cylinder portion. A predetermined amount of fluid flowing in is discharged from the discharge cylinder (see Patent Document 1).

JP-A-06-10831

In the above-described solenoid pump, in order to generate high-pressure fluid, it is necessary to reduce the plunger cross-sectional area (piston cross-sectional area) and press the fluid, but reducing the cross-sectional area of the plunger reduces the thrust. End up.
Moreover, when the cross-sectional area of the plunger is increased, there is a problem that the resistance of the fluid filled in the pump chamber is large and the pump efficiency is lowered.

  The present invention has been made to solve these problems, and an object of the present invention is to provide a solenoid pump capable of efficiently sucking and sending high-pressure fluid by increasing the thrust of the mover.

In order to achieve the above object, the present invention comprises the following arrangement.
The pump chamber provided in the pump body is closed by the pump cover, and the fluid sucked from the suction port on the pump cover side is connected to the stator coil disposed around the plunger provided in the pump chamber. A solenoid pump that repeats the operation of reciprocating by driving and discharging from the discharge port on the pump body side, the first valve body opening and closing the suction port biased toward the suction port from the pump cover; A second valve body that opens and closes the piston opening that is biased toward the piston opening in a cylindrical piston that is smaller in diameter than the plunger and connected in series to the plunger; and the first valve The plunger energized from the discharge port side toward the suction port side in the pump chamber having a larger channel diameter than the flow channel opened and closed by the body and the second valve body, and When the plunger is reciprocated by repeatedly energizing and de-energizing the stator coil, the fluid sucked from the suction port is opened and closed by sequentially opening and closing the first valve body and the second valve body. A predetermined high-pressure fluid is discharged from the discharge port of the pump main body by a predetermined amount by being fed into the pump chamber.

According to the above configuration, when the stator coil is energized and de-energized to reciprocate the plunger, the fluid sucked from the suction port is pressurized by sequentially opening and closing the first and second valve bodies. The fluid is fed into the pump chamber, and a predetermined high-pressure fluid can be discharged from the discharge port of the pump body by a predetermined amount.
In addition, since the cylindrical piston connected in series with the plunger has a smaller diameter than the plunger, when the plunger is restored to its original position by stopping energization to the stator coil, the plunger is removed from the fluid. The resistance received can be suppressed, and the thrust can be prevented from decreasing.

  Further, it is formed between a first storage portion formed between the first valve body and the second valve body and a pump chamber communicating from the second valve body through the internal space of the piston. And a fluid stored in the first storage part and a fluid stored in the second storage part by the reciprocating movement of the plunger. When the second valve body opens and closes due to the difference in fluid pressure, the high-pressure fluid is stored in the second storage portion, and the suction and discharge operations of the fluid in the pump chamber are alternately performed.

  According to this, when the first valve body opens and closes and the second valve body opens and closes due to the difference in fluid pressure between the fluid stored in the first storage section and the fluid stored in the second storage section. The high-pressure fluid is gradually stored in the second storage part, and the predetermined high-pressure fluid can be quantitatively fed from the pump chamber.

  The plunger is formed in a cylindrical shape opened to the discharge port side, and a fluid escape groove or a fluid escape hole is provided on the outer peripheral surface of the cylinder.

  According to this, it is possible to reduce the fluid resistance when the plunger is reciprocated in a state where the pump chamber having a large flow path communicating with the internal space of the piston is filled with the fluid.

  By using the above-described solenoid pump, it is possible to provide a highly versatile solenoid pump that can increase the thrust of the mover and efficiently suck and send high-pressure fluid.

It is sectional explanatory drawing which shows the structure of a solenoid pump. It is sectional explanatory drawing which shows the non-energized state of a solenoid pump. It is a section explanatory view showing the energization state of a solenoid pump. It is the front view and top view of a plunger. It is the top view and sectional view of a plunger concerning other examples.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a solenoid pump according to the present invention will be described in detail with reference to the accompanying drawings. With reference to FIG. 1, the whole structure of a Solenoi pump is demonstrated.
The pump body 1 is provided with a stator 2 and a mover 3. A pump chamber 4 is provided in the pump body 1, and the pump chamber 4 is closed by screwing a pump cover 5 to the pump body 1. In the pump body 1 and the pump cover 5, a flow path communicating with the pump chamber 4 is formed. The pump cover 5 is provided with a suction port 5 a for sucking fluid into the pump chamber 4, and the pump body 1 is provided with a discharge port 1 a for discharging fluid from the pump chamber 4. The fluid sucked from the suction port 5a on the pump cover 5 side is reciprocated by the electromagnetic drive between the mover 3 provided in the pump chamber 4 and the stator 2 disposed around the pump cover 4 so as to be on the pump body 1 side. The operation of discharging from the discharge port 1a is repeated.

  A control board 6 is screwed to the end of the pump body 1 on the discharge port side, and the control board 6 is sealed with a board cover 7. The control board 6 is electrically connected to a later-described stator coil.

  The stator 2 includes a bobbin 8a having an air core formed on the outer periphery of the pump chamber 4, and an air core stator coil 8 wound around the bobbin 8a. A yoke 9 is provided on the outer peripheral side of the bobbin 8a and on both ends in the winding core direction. The stator coil 8 is electrically connected to the control board 6. Further, when the stator coil 8 is energized, a magnetic circuit is formed between the yoke 9 and the plunger 10 to attract the mover 3.

  As the mover 3, a plunger 10 provided in the pump chamber 4 so as to be capable of reciprocating movement and a piston 11 having a smaller diameter are connected in series. As an example, the piston outer diameter is formed to be (1/4) or less of the plunger outer diameter. The plunger 10 has a cylindrical shape made of a magnetic material (for example, stainless steel) that is open on the discharge side, and a coil provided between the discharge side wall surface of the pump chamber 4 and a spring receiving plate 12 provided on the inner bottom portion of the plunger. The spring 13 is always urged toward the suction port side. A fluid passage hole 12 a is provided at the center of the spring receiving plate 12. The plunger 10 is provided in the pump chamber 4 so as to slide along the inner peripheral surface of the stator formed by the bobbin 8a and the yoke 9.

  Further, the piston 11 has a cylindrical shape, and a flange portion 11 a provided in the discharge side opening is sandwiched between the spring receiving plate 12 at the inner bottom portion of the plunger 10 and connected in series with the plunger 10. The front end side of the piston 10 is inserted into the flow path 5 b of the pump cover 5.

  In the flow path 5b of the piston cover 5, a first ball valve 14 (first valve body) that opens and closes the suction port 5a is provided. The first ball valve 14 is urged so as to always close the suction port 5a by a first coil spring 15 provided between the discharge side wall surface 5c of the flow path 5b and the valve ball 14a.

  The cylindrical piston 11 is provided with a second ball valve 16 (second valve body) for opening and closing the piston opening 11b on the suction side. The second ball valve 16 is urged so that the piston opening 11b is always closed by the second coil spring 17 provided between the spring receiving plate 12 provided on the pump chamber 4 side and the valve ball 16a. Has been.

  Further, a seal material 18 (O-ring) is provided at the interface between the pump body 1 and the pump cover 5 to prevent fluid leakage. Further, a seal material 19 (packing) is provided at the interface between the pump body 1 and the substrate cover 7 to seal the control substrate 6.

Since the plunger 10 is formed in a cylindrical shape opened to the discharge port side and reciprocates in a state where the pump chamber 4 is filled with fluid, the movable element 3 cannot move unless the fluid moves. Therefore, as shown in FIGS. 4 (a) and 4 (b), it is desirable that one or a plurality of relief grooves 10a for fluid are formed on the outer peripheral surface of the cylindrical body.
Alternatively, as shown in FIGS. 5A and 5B, one or more fluid escape holes 10 b may be provided on the suction side end face of the plunger 10.
Thereby, the resistance which the needle | mover 3 receives from the fluid at the time of reciprocating the plunger 10 in the state with which the inside of the pump chamber 4 with a large flow path diameter connected to the internal space of the piston 11 was filled with the fluid can be reduced.

A predetermined high-pressure fluid is obtained by reciprocating the plunger 10 by electromagnetic drive and supplying the fluid sucked from the suction port 5a to the pump chamber 4 by opening and closing the first and second ball valves 14 and 16 to pressurize the fluid to a predetermined pressure. Can be discharged from the discharge port 1a of the pump body 1 by a predetermined amount.
Further, since the cylindrical piston 11 connected in series to the plunger 10 is formed with a smaller diameter than the plunger 10, it is movable when the energization to the stator coil 8 is stopped and the plunger 10 is restored to the original position. The resistance that the child 3 receives from the fluid can be suppressed.

  Here, the suction and discharge operation of the fluid by the solenoid pump will be described with reference to FIGS. The flow path space partitioned by the first ball valve 14 and the second ball valve 16 is used as the first storage section 20, and the flow path space from the second ball valve 16 to the pump chamber 4 is stored as the second storage space. Part 21 is assumed.

  As shown in FIG. 1, when the stator coil 8 is not energized, the plunger 10 is biased by the coil spring 13 and the spring receiving plate 12 is pressed against the suction side wall surface of the pump chamber 4. The first and second ball valves 14 and 16 close the suction port 5a and the piston opening 11a.

In FIG. 3, when the stator coil 8 is energized, the plunger 10 is attracted to the discharge side against the biasing direction of the coil spring 13 by the magnetic attractive force with the stator yoke 9.
At this time, the piston 11 also moves together with the plunger 10. For this reason, since the pressure of the 1st storage part 20 turns into a negative pressure, the 1st ball valve 14 opens and fluid flows into the 1st storage part 20 from suction mouth 5a. When the fluid pressure in the first reservoir 20 and the fluid pressure in the suction port 5a are balanced, the first ball valve 14 is closed.

  When the energization to the stator coil 8 is stopped, the plunger 10 is pressed against the wall surface on the suction port side of the pump chamber 4 (the inner wall surface of the pump cover 5) by the biasing force of the coil spring 13, as shown in FIG. At this time, since the pressure of the fluid confined in the first reservoir 20 rises, the second ball valve 16 opens, and the first ball in the piston 11 passes through the piston opening 11b from the first reservoir 20. The fluid flows into the two reservoirs 21. When the fluid pressure in the first reservoir 20 and the fluid pressure in the second reservoir 21 are balanced, the second ball valve 16 is closed.

  While repeating the above operation, a high-pressure fluid flows from the first reservoir 20 into the second reservoir 21, and when the fluid pressure in the second reservoir 21 reaches a predetermined high pressure, the pump chamber 4 passes through the discharge port 1a. A certain amount of high-pressure fluid is discharged. According to this, the second valve body 16 is opened and closed by the difference in fluid pressure between the fluid stored in the first storage section 20 and the fluid stored in the second storage section 21 when the first valve body 14 opens and closes. By opening and closing, the high-pressure fluid is gradually stored in the second storage portion 21, and a predetermined high-pressure fluid can be quantitatively fed from the pump chamber 4.

DESCRIPTION OF SYMBOLS 1 Pump main body 1a Discharge port 2 Stator 3 Mover 4 Pump chamber 5 Pump cover 5a Suction port 5b Flow path 5c Discharge side wall surface 6 Control board 7 Substrate cover 8 Stator coil 8a Bobbin 9 Yoke 10 Plunger 10a Escape groove 10b Escape Hole 11 Piston 11a Flange 11b Piston opening 12 Spring receiving plate 12a Flow path hole 13 Coil spring 14 First ball valve 14a, 16a Valve ball 15 First coil spring 16 Second ball valve 17 Second coil spring 18, 19 Sealing material 20 First reservoir 21 Second reservoir

Claims (3)

The pump chamber provided in the pump body is closed by the pump cover, and the fluid sucked from the suction port on the pump cover side is connected to the stator coil disposed around the plunger provided in the pump chamber. A solenoid pump that repeats the operation of reciprocating by driving and discharging from the discharge port on the pump body side,
A first valve body for opening and closing the suction port biased from the pump cover toward the suction port;
A second valve body that is smaller in diameter than the plunger and opens and closes the piston opening urged toward the piston opening in a cylindrical piston connected in series to the plunger;
The plunger energized from the discharge port side toward the suction port side into the pump chamber having a larger flow path diameter than the flow path opened and closed by the first valve body and the second valve body,
When the plunger was reciprocated by repeatedly energizing and de-energizing the stator coil, the fluid sucked from the suction port was pressurized by sequentially opening and closing the first valve body and the second valve body. A solenoid pump, wherein a predetermined high-pressure fluid is discharged from a discharge port of the pump main body by a predetermined amount by feeding a fluid into the pump chamber. A first reservoir formed between the first valve body and the second valve body, and a pump chamber formed between the second valve body and a pump chamber communicating with the internal space of the piston. 2 storage parts are formed,
Due to the reciprocating movement of the plunger, the first valve body opens and closes, and the second valve body is caused by the difference in fluid pressure between the fluid stored in the first storage section and the fluid stored in the second storage section. 2. The solenoid pump according to claim 1, wherein the high-pressure fluid is stored in the second storage unit by opening and closing, and the fluid suction and discharge operations are alternately performed.   2. The plunger according to claim 1, wherein the plunger is formed in a cylindrical shape that opens to the discharge port side, and a fluid escape groove or a fluid escape hole is provided on an end surface of the suction side on the outer peripheral surface of the cylinder. Or the solenoid pump of 2.

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