CN105277251A - A double measuring tube liquid level gauge - Google Patents

Abstract

The invention provides a double-measuring-tube liquid level meter which comprises a host, two gas transmission pipelines and two measuring cups, wherein the host comprises a case, and a gas pump, a control circuit board and a three-way valve which are arranged in the case, a gas inlet and two gas outlets are arranged on the case, one port of the three-way valve is exposed in the case, the other two ports are respectively connected with the two gas outlets on the case, and the two gas outlets are respectively connected with the two measuring cups through the gas transmission pipelines. The invention utilizes double loops, respectively measures the pressure P1 and P2 at the two measuring cups by converting the three-way valve, calculates the depth H1 and H2 of the water level at the two sides, and the difference value of H1 and H2 is the water level difference at the two sides of the hydropower station, and can realize the monitoring of the generating head of the hydropower station only by one water level meter, thereby greatly saving the cost and the labor. The invention can also be used for liquid level measurement of the closed tank body, the two measuring cups are respectively arranged at the bottom and the top of the closed tank body, the pressure difference between the two positions is measured, and the liquid level height is calculated.

Description

A double measuring tube liquid level gauge

technical field

The invention relates to a liquid level measuring device, in particular to a double measuring tube liquid level gauge.

Background technique

At present, most domestic collection of water level data adopts float-type water level gauges or manual observations. The premise of using float-type water level gauges is to invest in the construction of logging wells, and secondly, personnel need to maintain and debug equipment regularly or irregularly every day, which limits the use of float-type water level gauges. The field application of the type water level gauge cannot meet the timeliness of hydrological information transmission, while the bubble type water level gauge breaks the traditional collection method of water level data and solves the problem of collecting water level data without logging. The bubble type water level gauge is mainly used in areas where the water level observation point is inconvenient to build a well or the cost of building a well is expensive. It has the characteristics of convenient installation and maintenance, flexible operation, stable and reliable operation, and high precision. It is an ideal water level measurement in the current non-logging water level measurement. One of the testing instruments.

However, the traditional water level gauge is a single circuit. The working principle is that after the air is filtered and purified through the air filter, the air pump presses the air into the air storage tank through the one-way valve. The gas in the air storage tank is divided into two ways to control the pressure respectively The pressure sensor in the unit and the vent pipe leading into the water are transported. When the air pump stops blowing, the one-way valve is closed, and the mouth of the underwater vent pipe is sealed by gas. Thereby, an airtight cavity connecting the pressure sensor and the underwater vent pipe mouth is formed. According to the principle of pressure transmission, when the gas in the ventilation pipe reaches a dynamic balance, the pressure on the mouth of the underwater ventilation pipe is transmitted to the pressure sensor of the pressure control unit through the ventilation pipe. Therefore, the pressure of the mouth of the underwater ventilation pipe and the pressure The pressure sensor of the control unit bears the same pressure, and the net pressure value of the water head can be obtained by subtracting the atmospheric pressure value from the pressure value, so that the measured water level value can be obtained. When the existing water level gauge measures the water level difference of the hydropower station, two water level gauges are required to measure the water levels on both sides of the hydropower station respectively.

Contents of the invention

The object of the present invention is to overcome the deficiencies of the prior art, and provide a double measuring tube liquid level gauge, which can simultaneously measure the water levels on both sides of the hydropower station, and calculate the water level difference on both sides.

The present invention is achieved like this:

A double measuring tube liquid level gauge, including a host, two gas pipelines and two measuring cups, the host includes a case, and an air pump, a control circuit board and a three-way valve arranged in the case, the case is provided with a gas Inlet and two gas outlets, one port of the three-way valve is exposed in the case, and the other two ports are respectively connected to two gas outlets on the case, and the two gas outlets are respectively connected to two measuring cup connection.

In a preferred embodiment, the three ports of the three-way valve are the first port, the second port and the third port, the second port is located on the vertical line connecting the first port and the third port, and the two The two gas outlets are respectively a first gas outlet and a second gas outlet, the first gas outlet is connected to the first port through a first joint, the second gas outlet is connected to the second port through a second joint group, and the second gas outlet is connected to the second port through a second joint group. The second joint group includes joint I for connecting with the gas pipeline, joint II for connecting with the second port of the three-way valve, and joint III for connecting joint I and joint II.

In a preferred embodiment, the air pump and the control circuit board are fixed on the inner wall of the case.

In a preferred embodiment, the case is a six-sided structure, including a front cover, a rear cover, an upper cover, a lower cover and two side covers, and the air pump and the control circuit board are fixed on the inner cover of the case .

In a preferred embodiment, the gas inlet and two gas outlets are arranged on the front cover.

In a preferred embodiment, a filtering device is provided at the gas inlet.

In a preferred embodiment, a muffler is provided at the gas inlet.

When the present invention is used, two measuring cups are respectively placed at the bottom of the waters on both sides, and the pressures P1 and P2 at the two measuring cups are respectively measured by switching the three-way valve by using a double circuit, and the depths H1 and H2 of the water levels on both sides are calculated , the difference between H1 and H2 is the water level difference on both sides of the hydropower station. Only one water level gauge is needed to monitor the power generation head of the hydropower station, which greatly saves cost and manpower. The present invention can also be used to measure the liquid level of a closed tank, place two measuring cups on the bottom and top of the closed tank respectively, measure the pressure P1 and P2 at the two measuring cups, obtain the pressure difference between the two places, and calculate Liquid level height H.

Description of drawings

Fig. 1 is the exploded view of the dual measuring tube liquid level gauge provided by the present invention;

Fig. 2 is the side view of the dual measuring tube level gauge provided by the present invention;

Fig. 3 is A-A sectional view of Fig. 2;

Fig. 4 is the schematic diagram of the water level difference of the detection hydropower station of the double-measuring tube liquid level gauge provided by the present invention;

Fig. 5 is a schematic diagram of detecting the liquid level of a closed tank by the double measuring tube liquid level gauge provided by the present invention.

detailed description

The present invention will be further described below in conjunction with specific embodiments with reference to the accompanying drawings, so as to better understand the present invention.

Referring to Figures 1-5, the present invention provides a dual measuring tube liquid level gauge, including a host 100, two gas pipelines 200 and two measuring cups 300, the host includes a chassis 110, and an air pump 120 arranged in the chassis , the control circuit board 130 and the three-way valve 140, the gas inlet 111 and two gas outlets are set on the said cabinet, one port of the three-way valve 140 is exposed in the cabinet, and the other two ports are respectively connected to the two ports on the cabinet The gas outlets are connected, and the two gas outlets are respectively connected to the two measuring cups 300 through the gas delivery pipeline 200 .

Hydropower generation water head monitoring: When in use, place two measuring cups 300 at the bottom of the waters on both sides of the hydropower station, use the double circuit, measure the pressure P1 and P2 at the two measuring cups by switching the three-way valve 140, and calculate the pressure on both sides. The depths H1 and H2 of the water level, and the difference between H1 and H2 is the water level difference on both sides of the hydropower station. Only one water level gauge is needed to monitor the power generation head of the hydropower station, which greatly saves cost and manpower.

Liquid level measurement of a closed tank: place two measuring cups 300 on the bottom and top of the closed tank respectively, measure the pressure P1 and P2 at the two measuring cups, obtain the pressure difference between the two places, and calculate the liquid level height H.

The three ports of the three-way valve 140 are the first port, the second port and the third port, the second port is located on the vertical line of the connecting line between the first port and the third port, and the two gas outlets are respectively the first Gas outlet 112 and second gas outlet 113, the first gas outlet 112 is connected with the first port through the first joint 151, the second gas outlet 113 is connected with the second port through the second joint group, the second The joint set includes a joint I152 for connecting with the gas pipeline 200 , a joint II153 for connecting with the second port 142 of the three-way valve, and a joint III154 for connecting the joint I152 and the joint II153 . This connection structure can ensure the stable connection between the three-way valve 140 and the gas pipeline 200 .

The cabinet is a six-sided structure, including a front cover 114, a rear cover 115, an upper cover 116, a lower cover 117 and two side covers 118, and the air pump 120 and the control circuit board 130 are fixed on the rear cover 115 of the cabinet . The gas inlet 111 and two gas outlets are disposed on the front cover 114 .

A filtering device and a muffler 160 are provided at the gas inlet. Make the gas entering the case pure, the airflow stable, ensure the measurement accuracy, and prolong the service life of the liquid level gauge.

The specific embodiments of the present invention have been described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions to the present invention are also within the scope of the present invention. Therefore, equivalent changes and modifications made without departing from the spirit and scope of the present invention shall fall within the scope of the present invention.

Claims (7)

1. a two test tube liquid level gauge, it is characterized in that, comprise a main frame, two gas pipe lines and two measuring cups, described main frame comprises cabinet, and the air pump, control circuit board and the T-valve that are arranged in cabinet, described cabinet is established gas feed and two gas vents, a port of described T-valve is exposed in cabinet, another two ports are connected with the gas vent of two on cabinet respectively, and two gas vents are connected with two measuring cups respectively by described gas pipe line.

2. according to claim 1 pair of test tube liquid level gauge, it is characterized in that, three ports of described T-valve are the first port, second port and the 3rd port, second port is positioned on the perpendicular line of the line of the first port and the 3rd port, two gas vents are respectively the first gas vent and the second gas vent, first gas vent is connected with described first port by the first joint, second gas vent is connected with described second port by the second joint group, described second joint group comprises the joint I for being connected with gas pipe line, the joint II be connected with described T-valve second port, and the joint III of jointing I and joint II.

3. according to claim 1 pair of test tube liquid level gauge, is characterized in that, described air pump and control circuit board are fixed on the inwall of described cabinet.

4. according to claim 1 pair of test tube liquid level gauge, is characterized in that, described cabinet is six sided structures, and comprise protecgulum, bonnet, upper cover, lower cover and two side covers, described air pump and control circuit board are fixed in described cabinet and cover.

5. according to claim 6 pair of test tube liquid level gauge, is characterized in that, described gas feed and two gas vents are arranged on described protecgulum.

6. according to claim 1 pair of test tube liquid level gauge, is characterized in that, described gas feed place is provided with filtration unit.

7. the two test tube liquid level gauges according to claim 1 or 6, it is characterized in that, described gas feed place is provided with sound suppressor.