KR200187105Y1 - Pressure transducer - Google Patents

Abstract

The present invention relates to a pressure converter in which the amount of fluid is controlled according to the change in capacitance by changing the capacitance by the hydraulic pressure of the fluid so that a fluid or liquid such as gas is stored in a storage means, the pressure converter according to the present invention Is formed in a sealed space and a compression space therein by an insulating rubber plate, and a housing in which fluid is introduced into the compression space, and a first space installed in the sealed space so that the interval is varied when the insulating rubber plate is tensioned by hydraulic pressure of the fluid flowing into the compression space. And a capacitance converting unit for outputting a capacitance value which is varied according to the distance between the second electrode plate and the first and second electrode plates.

Description

Pressure transducer

The present invention relates to a pressure converter, and more particularly, the pressure of the fluid amount is controlled by having a capacitive conversion unit for changing the capacitance by the hydraulic pressure of the fluid so that the fluid such as liquid or gas is stored in the storage means in a certain amount It relates to an inverter.

In general, as a device for storing a certain amount of fluid such as liquid or gas in the storage means, a representative level control device.

This water level control device is installed in the reservoir tank, the water level is changed as the storage amount is changed, and accordingly the mechanical level control device to maintain the constant water supply by opening and closing the opening and closing valve of the water supply device mechanically have.

On the other hand, there is an electronic water level control device for attaching the water level sensor in the high water level and the low water level inside the water tank, respectively, and the water supply device is operated according to whether the attached water level sensor is detected.

The mechanical water level control device, which is electronic in the water level control device, is frequently broken, and additional water is supplied through the on / off valve in the process of opening / closing the on / off valve of the water supply device at a constant level because the floating port rises a certain height from the surface. It is impossible to adjust the water level accurately.

The latter electronic water level control device is inconvenient to remove the water level sensor and re-install it in a proper position when changing the high water level and the low water level. There is always a risk of failure or malfunction due to flooding or other problems.

Accordingly, the present invention is to provide a pressure converter capable of adjusting the water level according to the variable capacitance capable of adjusting the multi-level water level, and the problem of malfunction due to immersion.

Therefore, in order to achieve the above object, the present invention provides a sealing space and a compression space formed therein by an insulating rubber plate, and when the insulating rubber plate is tensioned by the hydraulic pressure of the fluid flowing into the compression space and the housing into which the fluid enters the compression space. It includes a first and second electrode plate provided to face each other in the sealed space so that the interval is variable, and a capacitance conversion unit for outputting a capacitance value that varies according to the variation of the interval of the first and second electrode plate.

1 is a perspective view of a pressure transducer according to the present invention.

FIG. 2 is a sectional view taken along the line <II-II '> of FIG.

3 and 4 is an operating state of the pressure transducer according to the present invention.

※ Explanation of symbols for main parts of drawing ※

10 housing 15 capacitance conversion unit

16: insulating rubber plate 17: support plate

18: compression spring 19,20: electrode plate

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the pressure transducer according to the present invention.

Referring to FIGS. 1 and 2, the pressure transducer according to the present invention includes a housing 10 in which an upper portion 10-1 and a lower case 10-2 are coupled to each other to form a space therein.

A cover 10-3 is formed on an upper surface of the upper case 10-1, and a lower surface of the lower case 10-2 is connected to a water storage tank and a pipe (not shown) to compress the inside of the pipe by water stored therein. An inlet 11 through which air is introduced is formed.

In addition, between the upper case 10-1 and the cover 10-3 is connected to the first and second electrode plates 19 and 20 so that the capacitance varies according to the distance between the first and second electrode plates. The capacitance converting unit 15 to measure is formed, the connection terminal 12 for sensing the amount of water stored in the reservoir tank according to the capacitance measured by the capacitance converting unit and transmits it to the external water supply device to convert the capacitance It is connected to the part 15 and protrudes to one side of the upper case 10-1.

Here, the capacitance converting section 13 is constituted by a C / V conversion circuit that outputs a change in capacitance according to the interval between the first and second electrode plates at a predetermined voltage value.

Inside the housing 10, an insulating rubber plate 16 is installed between the upper case 10-1 and the lower case 10-2 to be engaged with a coupling portion of the upper case and the lower case, thereby compressing the internal space of the housing. 13) and the enclosed space (14).

Therefore, the compressed air introduced through the inlet 11 by the water flowing into the reservoir tank continuously flows into the compression space 13 between the insulating rubber plate 16 and the inner wall surface 10-2a of the lower case. Entry into the sealed space 14 is prevented.

In the sealed space 14 formed by the insulating rubber plate 16, a supporting plate for pressing the insulating rubber plate 16 downward by the compression spring 18 held by the upper case inner wall upper surface 10-1a ( 17) is fixedly installed in the center of the upper surface of the insulating rubber plate (16).

Therefore, as the compressed air flows into the compression space 13 through the inlet 11, the insulating rubber plate 16 receives hydraulic pressure in the upward direction, but the compression spring 18 formed in the sealed space 14 is supported by the support plate 17. ) Is pressed downward to support the insulating rubber plate 16, the insulating rubber plate is maintained in a stable state does not move upward.

In this state, when the compressed air continuously flows into the compression space 13 and the hydraulic pressure greater than the pressing force of the compression spring 18 is applied to the isolation rubber plate 16 in the upward direction, the isolation rubber plate 16 is compressed in the compression spring 18. Overcome the pressing force of the tension is a predetermined distance to the support plate 17 to rise a predetermined distance in the upward direction.

In addition, the capacitance change is measured and stored in the C / V circuit of the capacitance converter 15 on the upper surface of the support plate 17 located in the sealed space 14 and the inner wall surface 10-1a of the upper case. The first and second electrode plates 19 and 20 are formed to detect the level.

The capacitance measured in the C / V circuit of the capacitance converter 15 by the first and second electrode plates is

Same as

Where C is the capacitance (unit: F), S is the opposing area (m²) of the electrode, r is the distance (m) between the electrodes, and ε is the dielectric constant (F / m).

In the above formula, in order to change the capacitance, the first electrode plate 19 is installed on the upper surface of the support plate 17, and the inner wall upper surface 10-1a of the upper case is made to face each other with the same size as the first electrode plate. 2 The electrode plate 20 is installed.

Since the first and second electrode plates of the present invention have the same area and are installed at opposite positions, S is fixed and r is changed so that the capacitance F is changed. That is, the capacitance is changed as the interval between the first and second electrode plates is varied.

When r is changed in the above equation with reference to FIG. 3, when the hydraulic pressure of the compressed air flowing into the compression space 13 through the inlet 11 of the lower case is smaller than the pressing force of the compression spring 18, The insulating rubber plate 16 and the support plate 17 do not move upwards.

Therefore, since the interval r1 between the first electrode plate 19 and the second electrode plate 20 does not change, the capacitance converter 15 outputs the same voltage value according to the same capacitance value, The voltage value is transmitted to the controller of the water supply so that a continuous supply of water is achieved.

Referring to FIG. 4, the compressed air introduced into the compression space 13 through the inlet 11 by the water continuously supplied from the water supply device separates the hydraulic pressure larger than the pressing force of the compression spring 18. ), The insulating rubber plate is stretched upward while being moved upward to move the support plate 17 upward.

Accordingly, the interval r2 between the first electrode plate 19 and the second electrode plate 20 is changed, and the capacitance converter 15 transmits the changed voltage value according to the changed capacitance to the controller of the water supply device. do.

As such, when the distance r between the first electrode plate 19 and the second electrode plate 20 is changed, the C / V circuit of the capacitance converter 15 supplies a predetermined voltage value separately according to the above formula. The controller 12 outputs continuously through the connection terminal 12 to the controller of the device.

When the voltage value converted by the variable capacitance in the capacitance converter 15 and delivered to the controller of the water supply device reaches a set threshold voltage value, the water stored is recognized as having reached the reference level. The controller operates to stop water supply so that a constant level is maintained.

In addition, when the threshold value of the voltage value output from the capacitance converter 15 is formed to be variable, it is possible to adjust the level of water accordingly.

The pressure converter according to the present invention is not only used to control the water level of the storage tank, such as the above embodiment, but also to measure the pressure of the liquid or gas to maintain a constant amount of liquid or gas, such as a hydraulic pump, hydraulic compressor, etc. The upper case 10-1 and the lower case 10-2 of the housing may be formed of a material such as ceramics having good heat and fire resistance, and thus require resistance to a change in a special fluid or temperature. It can also be used as a pressure sensor.

As described above, in the pressure converter according to the present invention, the separation rubber plate is tensioned by fluid hydraulic pressure such as gas introduced into the housing according to the water level change of the water storage tank, and the interval between the first and second electrode plates is variable. As the capacitance changes in the capacitance converting unit, the water level is controlled as it is output at a predetermined voltage value, so that precise water level control is possible, and by changing the set value of the voltage value, multi-level water level adjustment is possible. The problem of malfunction caused by this is solved.

Claims (3)

A housing in which a sealed space and a compressed space are formed inside by the insulating rubber plate, and the fluid flows into the compressed space; First and second electrode plates provided to face each other in the sealed space so that the space is varied when the insulating rubber plate is tensioned by the hydraulic pressure of the fluid flowing into the compression space; And a capacitive converter configured to output a capacitance value that is varied according to the interval variation of the first and second electrode plates. The method according to claim 1, And the capacitance converter converts the capacitance value into a predetermined voltage value and outputs the converted voltage value. The method according to claim 1, The first electrode plate is provided on the upper surface of the insulating rubber plate, And the second electrode plate is installed on an upper surface of an inner wall of an upper case of the housing.