JP3149527U - Solenoid valve with measuring function - Google Patents

Abstract

The present invention relates to an electromagnetic valve used in a conduit through which a fluid flows, and prevents a flow rate from increasing beyond a theoretical value due to leakage and enables quantitative measurement. By providing a relief structure with a valve structure on the inflow hole side, a certain amount of fluid is allowed to flow into the inside of the valve body, and then the inflow hole is closed to measure a certain amount based on the internal volume of the valve body. Thereafter, the electromagnetic solenoid was energized, the valve was opened, and a fixed amount was discharged. [Selection] Figure 2

Description

  The present invention relates to a solenoid valve that is used for a fluid conduit in medical equipment, analytical equipment, tools, and other equipment and that has a metering function for controlling the flow rate.

  The solenoid valve opens and closes the valve using the suction force of the solenoid to control the flow of fluid in the pipe line. When the coil of the electromagnetic solenoid unit is energized, magnetic flux is generated, the fixed core, the moving core, etc. are magnetized, the moving core is attracted to the fixed core by the attractive force, the valve is opened, and the fluid flows in the pipe. On the other hand, the magnetic flux that de-energizes the coil of the electromagnetic solenoid portion disappears, the fixed core and the moving core are demagnetized, the attractive force is lost, the moving core is released, the valve is closed, and the flow of fluid in the pipe stops.

  For example, in the case of an electromagnetic valve having a straight structure for controlling fluid, the one shown in FIG. 1 is known. FIG. 1 is a cross-sectional view thereof, and arrows indicate the flow direction of the fluid. The coil 13 of the electromagnetic solenoid 12 is in a non-energized state and indicates a closed state. In this valve-closed state, a downward force due to the repulsive force of the spring 18 and fluid pressure is applied to the moving core 16, and the fixed core 15 and the moving core 16 are separated from each other and a gap is left. In addition, a valve rubber 17 is fitted in the center of the lower end of the moving core 16 and is urged by the orifice outflow hole 19 so that the fluid is sealed in the main body.

  When the coil 13 of the electromagnetic solenoid 12 is energized, the moving core 16 is attracted to the fixed core 15, overcomes the repulsive force of the spring 18, moves upward, and is attracted to the fixed core 15. At this time, the valve rubber 17 is also lifted upward, and a gap is formed between the lower surface of the valve rubber 17 and the circumferential upper edge of the orifice outflow hole 19, resulting in a valve open state.

  Next, when energization of the coil 13 is stopped, the attractive force of the fixed core 15 and the moving core 16 disappears, and the moving core 16 is pushed down by the resultant force of the repulsive force of the spring 18 and the downward force due to the fluid pressure. As a result, the lower surface of the valve rubber 17 fitted to the lower end of the moving core 16 is urged to the circumferential upper edge of the orifice outflow hole 19 and the valve is closed.

Problems that the device should solve

  As described above, the conventional straight type solenoid valve opens and closes the pipe line by energizing and de-energizing the solenoid, and shuts off the fluid flow. Was not easy. If an attempt is made to discharge fluid in the main body with such a solenoid valve, pressure fluctuations in the main body occur, and the flow rate may exceed the theoretical value due to leakage from the orifice inflow hole. As a countermeasure, a separate valve is provided on the inflow hole side, and an electromagnetic solenoid is required to control it.Also, it is possible to control the fluid discharge amount, but the energization time and drive frequency can be changed. In some cases, a separate driving device is required.

  In the conventional straight type solenoid valve, the flow of fluid is blocked by energizing or de-energizing the solenoid, but if a metering function is added by blocking the fluid, a fixed flow rate can be flowed in a certain time. . Moreover, it is considered that an inexpensive and improved electromagnetic valve can be obtained.

Means to solve the problem

  In order to solve the above-described problems, the present invention provides a solenoid valve having an inflow hole and an outflow hole for a fluid, and a movable valve body is provided between a fixed core and a moving core with a spring interposed between the moving core and the moving core. An elastic valve is arranged at the tip of the movable valve body and another elastic valve is arranged at the opposite end of the moving core, and the elastic valves are respectively connected to the inflow hole side and the outflow hole side by the spring. A solenoid valve with a metering function is provided in which the fluid is quantitatively introduced from the inflow hole by the relief function of the inflowing fluid pressure, and then is quantitatively discharged from the outflow hole by the reciprocating operation of the moving core.

  In addition, a groove is provided in the moving core on the side facing the fixed core, and the movable valve body is slidably housed via a spring. An elastic valve is disposed at the tip of the movable valve body, and the moving core Another elastic valve is disposed at the opposite end to the groove, and both the elastic valves are urged toward the inflow hole side and the outflow hole side by the spring, respectively. Was measured inflow, and then a solenoid valve with a metering function was made to quantitatively flow out from the outflow hole by the reciprocating motion of the moving core.

Effect of device

  In addition to the moving core in the valve body of the solenoid valve, by providing a movable valve body that urges in the opposite direction, a certain amount of fluid can be temporarily measured, and relief based on the fluid pressure on the spring and inlet side A fixed amount of fluid can be sequentially fed into the valve body by the function. In a continuous metering operation, a fixed amount is discharged into the outflow hole by reciprocating movement of the moving core by the electromagnetic valve, and in response to this, the elastic valve at the tip of the movable core can be opened and closed to allow a constant amount of fluid to flow. Therefore, it is not necessary to provide an extra fluid on-off valve on the inflow hole side. If a metering function is added by stopping the fluid, a fixed flow rate can be flowed in a certain time, so that a simple and inexpensive solenoid valve with a metering function can be obtained.

  As an embodiment of the present invention, a solenoid valve with a metering function having a straight structure can be cited. As the overall configuration, a casing core having an inflow hole orifice and an outflow hole orifice along the axis of the solenoid valve and provided with an electromagnetic solenoid is provided with a movable core that can slide along the axis. The electromagnetic valve is provided with a movable valve body between both cores and with a spring interposed on the moving core side. Further, the moving core and the movable valve body are biased to the outflow hole of the outflow side orifice and the inflow hole of the inflow side orifice, respectively, in a direction repelling each other by the spring.

  The fluid flows in from the upper end inflow hole, flows in the solenoid valve body, and flows out from the lower end outflow hole. An elastic valve is fitted at the center of the upper end of the movable valve body to ensure sealing and release of the fluid. The valve structure is urged toward the inflow hole side by a spring and has a relief function in combination with the fluid pressure in the inflow hole side orifice. The fluid pressure on the inflow hole side overcomes the spring force and allows a certain amount of fluid to flow into the solenoid valve body. When the fluid pressure flowing into the body and the fluid pressure at the inlet hole orifice become substantially the same pressure, the spring force is won and the inlet hole is closed. A certain amount is measured by the internal volume of the valve main body, and then the electromagnetic solenoid is energized to open the elastic valve of the moving core and discharge a certain amount.

  FIG. 2 shows an embodiment of an electromagnetic valve with a metering function in which a movable valve body is housed in a moving core as another embodiment of the present invention. Similarly, FIG. 2 is a sectional view showing the entire configuration of the solenoid valve with a metering function having a straight structure. As shown by an arrow, fluid flows in from the upper end inflow hole, flows in the electromagnetic valve body, and flows out in the lower end. More outflow. The electromagnetic valve 30 includes a valve body 31, an electromagnetic solenoid 32, a coil 33, a fixed core 35, a moving core 36, a movable valve body 37, a spring 38, an orifice outflow hole 41, and an orifice inflow hole 42. An elastic valve 39 is fitted at the center of the lower end of the moving core 36, and an elastic valve 40 is fitted at the center of the upper end of the movable valve element 37.

  In FIG. 2, the coil 33 of the electromagnetic solenoid 32 is in a non-energized state, and the elastic valve 39 at the lower end of the moving core 36 is in a closed state. In this closed state, the moving core 36 is applied with a downward force by the repulsive force of the spring 38 and is urged by the outflow hole 41 to close the valve. On the other hand, the movable valve body 37 is applied with an upward force and is urged by the orifice inflow hole 42. When the fluid pressure is not applied to the inflow hole 42 or the spring load is not reached, the valve is closed. In this case, a gap is formed on the surface where the movable core 36 and the movable valve element 37 are opposed to each other.

  Starting from this state, when the pressure of the fluid on the inflow hole side rises to a specified value, the elastic valve 40 at the upper end of the movable valve body 37 resists the repulsive force of the spring 38 due to the pressure difference between the inflow hole side and the main body. Opens and fluid flows into the valve body. When a predetermined amount flows, the internal pressure of the valve body rises, and when the pressure becomes substantially the same as the pressure on the inflow hole side, the repulsive force of the spring 38 wins, the movable valve body 37 moves upward, and the elastic valve 40 closes.

  Next, the fluid measured by staying between the elastic valves 39 and 40 operates the moving core 36 by the electromagnetic action of the electromagnetic solenoid, and the elastic valve 39 is lifted to be opened. As a result, the fluid flows out of the pipe from the outflow hole.

  Next, when the energization of the coil 33 of the electromagnetic solenoid 32 is stopped, the attractive force of the fixed core 35 and the moving core 36 disappears, and the moving core 36 moves downward by the repulsive force of the spring 38 as before, and the moving core When the lower surface of the elastic valve 39 fitted to the lower end of 36 is urged by the circumferential upper edge of the orifice outlet hole 41, the valve is closed.

  As described above, a constant amount of fluid can be measured, and a fixed amount of fluid can be sequentially fed into the valve body by the relief function based on the fluid pressure on the inlet hole side. In a continuous metering operation, a fixed amount is discharged to the outflow hole by a reciprocating motion of the moving core by an electromagnetic valve, and in response to this, the elastic valve at the tip of the movable core can be opened and closed to allow a constant amount of fluid to flow.

It is sectional drawing which shows the conventional example of a solenoid valve. It is sectional drawing which shows the solenoid valve with a measurement function which is an Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electromagnetic valve 11 Valve main body 12 Electromagnetic solenoid 13 Coil 15 Fixed core 16 Movable core 17 Valve rubber 18 Spring 19 Orifice outflow hole 30 Solenoid valve 31 with a metering function Valve main body 32 Electromagnetic solenoid 33 Coil 35 Fixed core 36 First movable core 37 Second movable core 38 Spring 39 Elastic valve 40 Elastic valve 41 Outflow hole 42 Inflow hole

Claims (2)

  In an electromagnetic valve having a fluid inflow hole and an outflow hole, a movable valve element is provided between a fixed core and a movable core and a spring is interposed between the movable core, and an elastic valve is provided at a tip of the movable valve element. And another elastic valve at the opposite end of the moving core, and both elastic valves are urged toward the inflow hole side and the outflow hole side by the spring, respectively. A solenoid valve with a metering function that allows a fluid to flow in a fixed amount from the inflow hole and then a fixed amount to flow out from the outflow hole by reciprocating movement of the moving core.   In a solenoid valve having an inflow hole and an outflow hole for fluid, a groove portion is provided in the moving core on the side facing the fixed core, and a movable valve body is slidably housed via a spring, and the distal end portion of the movable valve body An elastic valve is disposed on the other end of the movable core and the other elastic valve is disposed on the opposite end of the moving core. The springs urge both elastic valves toward the inflow hole and outflow holes, respectively. A solenoid valve with a metering function that causes a fluid to flow in a fixed amount from the inflow hole by a relief function of the fluid pressure, and then makes a constant flow out from the outflow hole by a reciprocating operation of the moving core.

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