JPS6140875B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure regulating valve device that obtains a predetermined control pressure by controlling the operation of a valve that is biased to a rest position by a return spring based on the duty of a coil excitation signal.

In conventionally well-known devices of this type, when driven at high frequency, the coil generates heat due to the reactance of the coil, the resistance value of the coil increases, and the current flowing through the coil decreases, making it difficult for the valve to operate.
Even if the duty is the same, the excitation operation time of the coil decreases, and if the coil generates heat, the valve operation time also changes, resulting in a disadvantage that a predetermined pressure regulation cannot be obtained.

Therefore, in order to solve the above-mentioned drawbacks, the present invention weakens the biasing force of the return spring according to the temperature rise, so that even if the coil heats up, if the excitation signal is the same duty, the valve operation time is the same and the predetermined value is maintained. The purpose of the present invention is to provide a pressure regulating valve device capable of regulating the pressure of the present invention.

The technical means taken to achieve the above-mentioned purpose is to control the opening and closing of a valve that is urged to a rest position by a return spring according to the duty of the excitation signal of the coil, and to obtain a control pressure according to the duty. In the valve device, one end of the return spring is locked, the return spring is disposed close to the coil, and the return spring is fixed by a value corresponding to a decrease or increase in coil excitation force as the temperature of the coil increases or decreases. The reason is that a bimetal is provided to reduce and increase the biasing force of the

According to the above-mentioned technical means, when the coil generates heat due to the excitation current and the current flowing through the coil decreases, the bimetal deforms and reduces the biasing force of the return spring, so that the valve operation time does not change. Conversely, even when the temperature of the coil decreases and the current flowing through the coil increases, the bimetal deforms and increases the biasing force of the return spring, so the valve operation time does not change.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the apparatus of the present invention will be described below with reference to the drawings.

Reference numeral 10 indicates the entire pressure regulating valve, and vacuum is introduced through a port 14 and atmospheric air is introduced through a port 15 into a chamber 13 which is kept airtight by a case 11 and a cover 12. Reference numeral 16 indicates a valve drive unit located within the chamber 13, 17 a coil, 18 a magnetic core, 19 a magnetic yoke, and 20 supported by the yoke 19 and tilted using the supporting position as a fulcrum. a movable plate; 21 is a non-magnetic flapper fixed to the plate 20 and operates integrally with the plate 20; 22 is a valve provided at one end of the flapper 21 to close the port 14; 23 is the other end of the flapper 21; A valve 24 is provided at the movable plate 20 at one end, and the other end is locked at the core by a return spring that biases the plate 20 and the flapper 21 in a counterclockwise direction as shown in the figure. The extended end of the bimetal 25 supported by the bimetal 18 is locked. Reference numeral 26 indicates a power supply cord for the coil 17.

The extending end of the bimetal 25 extends horizontally to the support position when the coil 17 is not generating heat and is at a low temperature, but when the coil 17 generates heat, it bends upward as shown in the figure as the temperature rises and the return spring 17 is bent upward. The biasing force of the return spring 17 acting on the plate 20 and the flapper 21 is gradually weakened. Therefore, even if the excitation effect of the coil 17 is weakened, the flapper 21 can be sufficiently displaced against the biasing force of the return spring 24. The valves 22 and 23 can be controlled.

In the operation of the pressure regulating valve device, the coil 17 is repeatedly energized and de-energized according to the duty of a voltage pulse, which is an excitation signal, applied to the coil 17 via the cord 26. Due to the attraction of the core 18 due to the excitation of the coil 17, the plate 20 and the flapper 21 rotate clockwise from the rest state shown in the figure using the yoke 19 as a fulcrum against the biasing force of the spring 24, and the valve 22 is removed from the port 14. In addition, the valve 23 contacts the port 15, so that the chamber 13 is cut off from communicating with the atmosphere, and vacuum is introduced from the port 14.

Also, when the coil 17 is de-energized, the valves 22 and 23
is returned to the illustrated rest position by the biasing force of the spring 24, the port 14 is closed, and the port 15 is opened to communicate the chamber 13 with the atmosphere. Therefore, the pressure regulating valve device 10 controls the communication between the ports 14 and 15 and the chamber 13 according to the excitation signal, so that a control pressure corresponding to the duty of the excitation signal is obtained in the chamber 13 and communicated with the chamber 13. The control pressure can be taken out as an output from the port 27. And coil 1
7 generates heat due to its energization, its resistance value increases, and even if the excitation effect of the coil 17 is weakened in accordance with the increase, the bimetal 25 detects the heat generated by the coil 17, and the return spring is activated in response to the heat generated. By weakening the biasing force of 25, the plate 20 and flapper 21 can accurately respond to the duty applied to the coil 17, and if the excitation signal has the same duty, the valve operating time remains the same regardless of temperature changes. A predetermined pressure regulating effect can be maintained.

As described above, according to the device of the present invention, the biasing force of the return spring that biases the valve toward the rest position is weakened as the temperature rises, so that the coil generates heat due to the excitation current and its resistance value increases. Even if the valve operating force is weakened, if the excitation signal has the same duty, the valve operating time remains the same regardless of temperature changes, and a predetermined pressure regulating action can be achieved, which is an excellent effect.

In addition, since the biasing force of the return spring that biases the valve to the rest position is strengthened in accordance with the decrease in temperature, even if the temperature of the coil decreases and its resistance value decreases, and the operating force of the valve increases, the excitation If the signals have the same duty, the valve operating time can be kept the same regardless of temperature changes, and a predetermined pressure regulating effect can be achieved.

[Brief explanation of the drawing]

The drawing is a sectional view showing an embodiment of the device of the present invention. 17...Coil, 24...Return spring, 22, 23...Valve, 25...Bimetal.

Claims (1)

[Claims] 1. In a pressure regulating valve device that controls the opening and closing of a valve biased to a rest position by a return spring according to the duty of a coil excitation signal to obtain a control pressure according to the duty, one end of the return spring is locked. At the same time, a pressure regulating device is provided with a bimetal that is disposed close to the coil and reduces or increases the biasing force of the return spring by a value corresponding to a decrease or increase in coil excitation force as the temperature of the coil increases or decreases. Valve device.