CN1174990A - pressure gauge - Google Patents

Abstract

The pressure gauge mainly comprises a pressure indicating device and a pressure setting and adjusting mechanism, wherein the pressure indicating device comprises a traditional pressure indicating element and a pressure control element, and the pressure setting and adjusting mechanism comprises a low pressure point setting mechanism and a high pressure point setting mechanism. When the user sets the fluid pressure of the device to be controlled within a pressure range, the user adjusts the low and high pressure set points through the pressure setting adjustment mechanism, so that the pressure control element generates control signals, such as voltage or current signals, according to the low and high pressure set points.

Description

pressure gauge

The invention relates to a pressure gauge capable of outputting control signals, in particular to a pressure gauge capable of setting fluid pressure within a certain pressure range.

In the production and manufacturing of general factories, it is often necessary to pay attention to controlling the pressure. For example, when the pressure is too high, dangerous situations will occur, and when the pressure is too low, the manufacturing requirements cannot be met. Usually in some application occasions, for example, the pressure of the pressure tank must be fixed within a certain pressure range, for example, between 275 Pa and 345 Pa. When the gas or liquid pressure is lower than 275 Pa, the gas or liquid should be pumped in. When the gas or liquid pressure reaches 345 Pa, the pump is turned off.

The commonly used pressure control gauge manometer 10 as shown in Figure 1 mainly has a fluid input port 12, a pressure conversion mechanism (not shown in the figure, which converts the fluid pressure into a mechanical displacement, and the fluid pressure can be obtained by virtue of the displacement), Indicating panel 13 , pressure indicating needle 14 , low pressure setting indicating needle 16 , high pressure setting indicating needle 18 , voltage input line 19 , low pressure signal output line 166 and high voltage signal output line 186 . The fluid input end 12 is connected to a device such as a pressure tank, and the pressure indicator needle 14 can display the fluid pressure value in the pressure tank.

The low pressure setting indicator needle 16 and the high pressure setting indicator needle 18 respectively have a low pressure lever 164 and a high pressure lever 184 above them, so that the operator can set the desired fluid pressure range. At the same time, the low pressure setting indicator needle 16 and the high pressure setting indicator needle 18 respectively have a low pressure setting probe 162 and a high pressure setting probe 182 below them so that the pressure indicating needle 14 can contact the above probes.

The voltage input line 19 and the pressure indicator pin 14 can conduct electricity, the low voltage signal output line 166 and the low voltage setting indicator pin 16 can conduct electricity, and the high voltage signal output line 186 and the high voltage setting indicator pin 18 can also conduct electricity.

The voltage input line 19 provides a voltage for the pressure indicating pin 14, such as +5V. When the pressure indicating pin 14 is between the set low pressure setting indicating pin 16 and the high pressure setting indicating pin 18, because the pressure indicating pin 14 is not When the low pressure setting probe 162 and the high pressure setting probe 182 are touched, the low voltage signal output line 166 and the high pressure signal output line 186 maintain the state of zero volts. When the pressure indicator needle 14 reaches the set high pressure position, because the pressure The indicator pin 14 touches the high-voltage setting probe 182, so that the high-voltage signal output line 186 also becomes +5V; when the pressure drops, because the pressure indicator pin 14 is separated from the high-voltage setting probe 182, the high-voltage signal output line 186 returns to zero Volt state. If the pressure drops to the position set by the low pressure point, the pressure indicator needle 14 touches the low pressure setting probe 162, so that the low pressure signal output line 166 becomes +5V.

Utilizing the above-mentioned action and principle, the operation of the fluid pump can be controlled by virtue of the low-voltage signal output line 166 and the high-voltage signal output line 186 plus a simple control circuit.

But the pressure gauge 10 of the commonly used pressure control gauge mentioned above has a serious shortcoming, that is, although the commonly used pressure control gauge 10 can set the fluid pressure within a certain range, it is only when the fluid pressure of the device to be controlled (such as the pressure tank) is originally set. It is only applicable within the pressure range, and cannot control a pressure tank whose original zero pressure or pressure is lower than the low pressure set point. The main reason is that when the pressure indicator needle 14 is at zero pressure or the pressure is lower than the low pressure set point, after starting the fluid pump operation, the fluid pressure in the pressure tank increases accordingly, but when the pressure indicator needle 14 reaches the low pressure set point , the pressure indicator needle 14 will touch the low pressure setting probe 162 of the low pressure setting indicator needle 16, so the control purpose cannot be achieved by crossing the low pressure setting indicator needle 16, which is very inconvenient to use.

The object of the present invention is to provide a pressure gauge which can completely control the fluid pressure of the device within a certain pressure range without being affected by the initial fluid pressure before the device is controlled.

The purpose of the present invention is achieved by adopting a pressure gauge, which includes a pressure indicating device and a pressure setting adjustment mechanism, wherein: the pressure indicating device at least includes a pressure indicating panel, a fluid input part that can communicate with the fluid, a A pressure switching mechanism that can be changed due to different fluid pressures, and a pressure indicating element that can display pressure through the pressure switching mechanism and the pressure indicating panel in combination with the pressure switching mechanism, and also includes a pressure control element;

The pressure setting adjustment mechanism includes a low pressure point setting mechanism for setting the low pressure point of the fluid pressure, and a high pressure point setting mechanism for setting the high pressure point of the fluid pressure;

The low pressure point setting mechanism includes at least a low pressure stopper and a low pressure point signal output element, and the high pressure point setting mechanism also includes at least a high pressure stopper and a high pressure point signal output element;

The pressure control element can only move between the low-pressure block and the high-pressure block, and when it moves, the pressure indicating element moves synchronously with it;

With the above structure, when the fluid pressure reaches the high pressure point, because the pressure control element touches the high pressure block, the high pressure point signal output element outputs a signal, and when the fluid pressure reaches the low pressure point, because the pressure control element touches When the low pressure stopper is touched, the low pressure point signal output element outputs a signal.

The pressure gauge of the present invention cooperates with the control circuit, the switch and the fluid pump, so that the fluid pressure of the controlled device can be set within a certain pressure range without monitoring by the user. More importantly, the pressure gauge of the present invention can automatically control the original zero pressure or the controlled device whose pressure is lower than the low pressure set point, so that the fluid pressure of the controlled device can be changed from zero pressure (or the pressure is lower than the low pressure set point) through the fluid pump. point) rises to the high pressure set point, and then the fluid pressure of the controlled device can be kept between the low pressure set point and the high pressure set point.

Below in conjunction with the embodiment shown in the accompanying drawings, the present invention will be described in further detail, in the accompanying drawings:

Figure 1 is a perspective view of a commonly used pressure control gauge;

Figure 2 is a perspective view of the main mechanism of a commonly used pressure gauge;

Fig. 3 is a partial three-dimensional exploded view of the pressure gauge of the present invention;

Fig. 4 is a perspective view of the pressure gauge of the present invention.

Figure 2 shows the main mechanism of a commonly used pressure gauge with a rotary pressure indicating needle, wherein the pressure gauge communicates with the fluid to be measured through the fluid input part 34, and the pressure conversion mechanism 36 can convert the fluid pressure into a mechanical displacement. The fluid pressure can be obtained by this displacement; the fluid enters the elastic pressure elbow 361 after passing through the fluid input part 34, and when the pressure increases, the elastic pressure elbow 361 moves outwards, and the rotating shaft 365 is driven by connecting the rotating arm 362 and other components , so that the pressure indicating element 38 rotates accordingly to know the current fluid pressure (as shown in FIG. 4 ), the present invention does not improve the pressure conversion mechanism 36, but mainly increases the pressure control function on the pressure setting adjustment mechanism 40 .

As shown in FIG. 4 , the pressure gauge of the present invention can be equipped with a safety relief valve 33 and a fluid output part 35 on a traditional copper connector 37 .

The rotating shaft 365 of the pressure conversion mechanism 36 of the present invention can support the pressure indicating element 38 and the pressure control element 39 . In this embodiment, the pressure control element 39 is freely engaged with the rotating shaft 365 through the movable collar 391 . When the rotating shaft 365 rotates, although the pressure indicating element 38 is driven, the pressure control element 39 is not driven. The outside of the movable collar 391 is combined with one end of a return spring 392, and the other end of the return spring 392 is combined with the protruding pin 393 fixed on the connecting support piece 363; Rely on the return spring to move from the high pressure point to the low pressure point.

A pressure indicating element 38 is combined with the rotating shaft 365 , and a driving rod 381 is provided at an appropriate position, and the function of the driving rod 381 is to drive the pressure control element 39 .

The pressure setting adjustment mechanism 40 is mainly divided into a low pressure point adjustment mechanism 42 and a high pressure point adjustment mechanism 44, which are respectively used to set the low pressure point and the high pressure point of the fluid pressure. The low pressure point adjustment mechanism 42 in this embodiment includes a low pressure stop 421, a low pressure support rod 422 and a low pressure rotating plate 423, wherein the top of the low pressure stop 421 is arranged in the slot 321 of the pressure indicating panel 32, and the bottom of the stop 421 is Threads are provided to combine with the upper end of the low-pressure support rod 422, while the lower end of the low-pressure support rod 422 is combined with the outer end of the low-pressure rotating plate 423 through the connecting nut 71; similarly, the high-pressure point adjustment mechanism 44 includes a high-pressure stop 441, The structure of the high pressure support rod 442 and the high pressure rotating plate 443 is the same as that of the low pressure point adjustment mechanism 42 . The above-mentioned low pressure point adjustment mechanism 42 and high pressure point adjustment mechanism 44 are combined with the copper joint 37 of the pressure indicating device 30 through a fixed plate 41. The fixed plate 41 has a central hole 413, and the low pressure rotating plate 423 is connected by a central bolt 414. The inner end and the inner end of the high-pressure rotating plate 443 are combined on the fixed plate 41 . The fixing plate 41 is combined with the copper connector 37 through the fixing holes 411 through the fixing bolts 412 . It should be noted that after the fixing plate 41 is combined with the copper connector 37 , the center hole 413 of the fixing plate 41 is located on the same axis as the rotating shaft 365 .

Since the low-pressure block 421 and the high-pressure block 441 can limit the movement range of the pressure control element 39, the pressure control element 39 can only move between the low-pressure block 421 and the high-pressure block 441; but it should be noted that the low-pressure block 421 And the high pressure block 441 cannot block the movement of the pressure indicating element 38 .

The low pressure point signal output element 51 and the high pressure point signal output element 52 output signals through the signal output elements when the pressure control element 39 reaches the low pressure point and the high pressure point.

In the present invention, when the pressure control element 39 arrives at the low pressure point or the high pressure point, it is necessary to transmit the arriving signal in order to control the external device. In this embodiment, the signal is transmitted in the form of current or voltage. The following describes how the present invention transmits signal; in the present embodiment, the low pressure point adjustment mechanism 42 and the high pressure point adjustment mechanism 44 are conductive materials, and the low pressure point signal output element 51 and the high pressure point signal output element 52 are all an electric wire, and respectively in the low pressure point The rotating plate 423 is connected to the appropriate place of the high-voltage rotating plate 443; and the movable collar 391, the return spring 392 and the pressure control element 39 are also conductive materials, wherein a power line 394 is connected to the return spring 392 so that the pressure control element 39 continues charged. In addition, in order to prevent the current of the power line 394 from being transmitted to other parts of the other pressure indicating devices 30, the protruding pin 393 can be an insulator, or the entire connecting support piece 363 can be an insulator. Therefore, when the pressure control element 39 is not in contact with the low-pressure block 421 or the high-pressure block 441, the low-pressure point signal output element 51 and the high-pressure point signal output element 52 are not charged, that is, there is no current or voltage output; When the control element 39 touches the low pressure block 421 or the high pressure block 441 , the low pressure point signal output element 51 or the high pressure point signal output element 52 can output a current or voltage signal.

In addition, in order that the user can clearly see the pressure indicating panel 32 and the pressure indicating element 38 in the dark, a light bulb 73 can be installed inside the pressure indicating device 30 , and the light bulb 73 can be slightly exposed outside the pressure indicating panel 32 .

Below illustrate the using method of pressure gauge of the present invention;

After the user unscrews the low pressure block 421 and the high pressure block 441, since the low pressure block 421 and the high pressure block 441 are slightly separated from the pressure indicating panel 32, the user can move the two in the slot 321 of the pressure indicating panel 32. Set the low pressure point (such as 275 Pa) and the high pressure point (such as 345 Pa) by the block. After the setting is completed, screw the low pressure block 421 and the high pressure block 441 on the pressure indicating panel 32, and the low pressure support rod 422 and high pressure support rod 442.

In the starting state, for example, the fluid pressure is 69 Pa, and the pressure control element 39 is at the position of the low pressure point of 275 Pa due to the blocking of the low-pressure block 421. After starting the power supply and starting the fluid pump, although the pressure control element 39 touches to the low-pressure block 421, so that the low-pressure point signal output element 51 outputs a signal to operate the fluid pump, but since the fluid pump is already in operation, the signal does not work. When the fluid pressure increases and reaches the low-pressure point position When the lever 381 of the pressure indication element 38 touches the pressure control element 39, the pressure indication element 38 drives the pressure control element 39 to move synchronously during the subsequent increase in fluid pressure; when it reaches the position of the high pressure point of 345 Pa , because the pressure control element 39 touches the high-pressure block 441, the high-pressure point signal output element 52 outputs a signal to stop the fluid pump. After the internal fluid is used, the internal pressure of the pressure tank decreases), and the pressure indicating element 38 moves to the direction of the low pressure point. At this time, although the driving rod 381 of the pressure indicating element 38 cannot drive the pressure control element 39, because the return spring 392 function, the pressure control element 39 can still move towards the low pressure point synchronously with the pressure indicating element 38; when the fluid pressure decreases and reaches the low pressure point, the pressure control element 39 touches the low pressure block 421, so that the low pressure point signal is output Component 51 outputs a signal to run the fluid pump, and restarts the fluid pump; the fluid pressure is automatically maintained between the low pressure point of 275 Pa and the high pressure point of 345 Pa by the above control method.

The present invention not only simplifies the complicated structure of the common pressure gauge, but more importantly, although the common pressure gauge can set the fluid pressure within a certain range, the fluid pressure in the pressure tank is originally within the set pressure range Applicable at times, but unable to control a pressure tank whose original zero pressure or pressure is lower than the low pressure set point, so it is inconvenient to use, and the pressure gauge of the present invention can completely control the fluid pressure of the device within a certain pressure range, and at the same time Not affected by the initial fluid pressure of the device prior to being controlled.

Since the present invention does not improve the pressure conversion mechanism, but adds a low pressure point setting mechanism and a high pressure point setting mechanism to the pressure indicating device, the form of the pressure indicating device is not limited to the commonly used ones described in the embodiments. Pressure indicating device, and the low pressure point setting mechanism and the high pressure point setting mechanism in the present invention are the most important role of the low pressure stopper and the high pressure stopper, so the low pressure point setting mechanism and the high pressure point setting mechanism can be It is a simple block, and the block can be moved in the slot of the pressure indication panel and fastened on the pressure indication panel; in addition, a plurality of small circular slots can be set on the pressure indication panel at appropriate intervals (for example, every 13.8 Pa A small circular slot is established), and the low-pressure block and the high-pressure block can be inserted into or pulled out of the circular slot. In addition, the pressure control element can also be arranged under the pressure indicating panel. At this time, with the appropriate low-pressure stopper and high-pressure stopper, the range of movement of the pressure control element can still be limited.

Claims (4)

1, a kind of tensimeter, it comprises pressure-indication means and pressure setting adjusting mechanism, wherein: pressure-indication means comprises a pressure indication panel at least, can with the fluid input part of fluid communication, one can be because of the different pressure conversion mechanism that change of hydrodynamic pressure, and combine with pressure conversion mechanism and can show the pressure indicator elment of pressure, and comprise a pressure control valve by pressure conversion mechanism and pressure indication panel;

Pressure is set adjusting mechanism and is comprised that one is used for setting the low pressure force set mechanism in the low pressure force of hydrodynamic pressure, and a high pressure points set mechanism that is used for setting the high pressure points of hydrodynamic pressure;

Low pressure force set mechanism comprises a low pressure block and low pressure force signal output element at least, and the high pressure points set mechanism at least also comprises a high pressure block and high pressure points signal output element;

Pressure control valve can only move between low pressure block and high pressure block, and when it moved, the pressure indicator elment was synchronized with the movement with it;

Rely on said structure, when hydrodynamic pressure arrives high pressure points, because pressure control valve touches the high pressure block, make high pressure points signal output element export a signal, and when hydrodynamic pressure arrives the low pressure force, because pressure control valve touches the low pressure block, makes low pressure force signal output element export a signal.

2, tensimeter as claimed in claim 1, wherein the pressure indicator elment is with a driving lever, and pressure control valve is with a returning spring, make when hydrodynamic pressure raises, pressure control valve is driven by the driving lever of pressure indicator elment, move to high pressure spot by low pressure point, and when hydrodynamic pressure reduced, pressure control valve was then moved to low pressure point by high pressure spot by returning spring.

3, tensimeter as claimed in claim 1, wherein pressure-indication means comprises safe let out valve and fluid output part.

4, tensimeter as claimed in claim 1, wherein the signal exported of low pressure force signal output element and high pressure points signal output element is the curtage signal.

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