CN214471208U

CN214471208U - Device for accurately metering liquid volume

Info

Publication number: CN214471208U
Application number: CN202120840172.5U
Authority: CN
Inventors: 王劲松; 翟翦
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-04-22
Filing date: 2021-04-22
Publication date: 2021-10-22
Anticipated expiration: 2031-04-22

Abstract

The embodiment of the utility model provides a device that relates to accurate measurement of liquid volume includes: a liquid inlet, a metering tank, an overflow tank and a liquid outlet; the liquid inlet is used for injecting calibration liquid; the measuring tank is communicated with the liquid inlet through a liquid inlet pipe which is connected with the liquid inlet at a first angle and is used for containing the injected calibration liquid; the overflow tank is connected with the metering tank through a conduction pipe and is used for discharging or entering air when the metering tank injects or discharges calibration liquid; the liquid outlet is communicated with the metering tank through a liquid outlet pipe connected with the liquid outlet at a second angle, and the liquid outlet is used for discharging calibration liquid. The utility model discloses a device has solved the device and has held back the problem of gas and stock solution easily through the setting of overflow tank, the setting of feed liquor pipe and inlet angle and the setting of drain pipe and liquid outlet angle, has realized the effect that the liquid volume was markd in the accurate measurement.

Description

Device for accurately metering liquid volume

Technical Field

The utility model relates to a liquid volume metering device field especially relates to a device of liquid volume accurate measurement.

Background

The standard measurement of the finished oil ground tank is not only an important basis and data support for internal management of the industry but also for external connection, and is also an environmental protection and energy saving requirement for energy in a new situation, and the uniform quantity of the industry can be realized only by standardizing the industry standard, so that the purposes of social fairness and fair measurement are realized. Many filling station ground jar are because bury for a long time in the underground, the circumstances such as ground unstability, jar body warp, air resistance appear to some filling stations do not have the volume table or the volume table is inaccurate, how under the circumstances of not rinsing ground jar, realize standard measurement, become the problem that awaits a urgent need to solve.

However, in the prior art, the metering device is still not accurate enough, sometimes causes great errors, causes unnecessary economic loss, and is easy to generate problems of air resistance, oil discharge, oil storage and the like. Therefore, it is very necessary to improve the accuracy of the metering device.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the defect that prior art exists, provide a device of liquid volume accurate measurement, can measure the volume of demarcation liquid accurately to make the device can be used for the volumetric accurate examination of ground jar.

In order to achieve the above object, the present invention provides a device for accurately measuring the volume of liquid, which is characterized in that the device comprises:

the liquid inlet is used for injecting calibration liquid;

the metering tank is communicated with the liquid inlet through a liquid inlet pipe which is connected with the liquid inlet at a first angle and is used for containing the injected calibration liquid;

the overflow tank is connected with the metering tank through a conducting pipe and is used for discharging or entering air when the metering tank injects or discharges calibration liquid;

the liquid outlet is communicated with the metering tank through a liquid outlet pipe connected with the liquid outlet at a second angle and used for discharging the calibration liquid;

when the calibration liquid is injected into the liquid inlet, the calibration liquid is injected into the metering tank through the liquid inlet pipe, and air in the metering tank enters the overflow tank through the conducting pipe and is discharged to the atmosphere through the overflow tank; and when the metering is finished, the calibration liquid passes through the liquid outlet pipe and is discharged out of the metering tank through the liquid outlet.

Preferably, the metering tank comprises a tank body, a conical bottom, an internal pipeline and a tank door;

the cone bottom is arranged in the tank body and is welded with the inner wall of the tank body, so that the inner space of the metering tank is divided into a containing cavity for the calibration liquid and an inner pipeline containing cavity; a first through hole is reserved on the conical bottom;

the inner tube way is located in the inner tube way holding cavity, include: one end of the elbow pipe is connected with the first through hole, and the other end of the elbow pipe is connected with the liquid outlet pipe;

the tank door is arranged on the tank body of the internal pipeline accommodating cavity and used for opening and closing the internal pipeline accommodating cavity.

Preferably, a second through hole is reserved on the cone bottom; the inner conduit further comprises: a connecting pipe and a three-way pipe;

the connecting pipe is connected with the second through hole; the three-way pipe is respectively connected with the connecting pipe, the liquid inlet pipe and the liquid outlet pipe.

Preferably, the overflow tank comprises:

the tank comprises a tank body and a tank cover, wherein the tank body comprises a tank wall, a top end socket and a bottom end socket which are connected with the tank wall, and a cone which is vertical to the tank wall; the cone divides the inner area of the tank body into a liquid supplementing cavity and an overflow cavity;

the overflow tank channel penetrates through the top end socket to be communicated with the metering tank, and is used for discharging air to the liquid supplementing cavity when the metering tank is filled with liquid, or enabling the air to enter the metering tank through the liquid supplementing cavity when the metering tank is discharged with liquid;

the gas exchange tube penetrates through the cone and is used for communicating the liquid supplementing cavity with the overflow cavity;

the gas exchange port is positioned on one side of the tank wall of the overflow cavity and is used for discharging and entering air from the overflow tank;

the overflow tank liquid inlet is positioned on one side tank wall of the overflow cavity and used for introducing liquid higher than the liquid level of the overflow outlet pipe into the overflow cavity;

the liquid supplementing pipe is positioned at the bottom of the cone, penetrates through one side tank wall of the overflow cavity and is connected with the metering tank, and is used for supplementing liquid to the metering tank;

the liquid discharge pipe is arranged on the bottom end sealing head in a penetrating way and is used for discharging the liquid in the overflow cavity out of the pipeline of the metering tank;

when liquid is injected into the metering tank, air in the metering tank enters the liquid supplementing cavity through the overflow tank channel, enters the overflow cavity through the gas exchange pipe, and is finally discharged into the atmosphere through the gas exchange port; when the liquid level of the injected liquid exceeds the overflow port pipe of the metering tank, the liquid flows into the overflow cavity through the liquid introducing port of the overflow tank; when the liquid level in the metering tank rises too fast, liquid enters the liquid supplementing cavity through the overflow tank channel; when liquid needs to be supplemented into the metering tank, the liquid flows into the metering tank through the liquid supplementing pipe; when the liquid in the overflow cavity is excessive, the liquid is discharged through the liquid discharging pipe.

Further preferably, the liquid supplementing pipe is communicated with the liquid inlet pipe; and a liquid supplementing switch is arranged on the liquid supplementing pipe.

Further preferably, the liquid discharge pipe is communicated with the liquid outlet pipe; and a liquid drainage switch is arranged on the liquid drainage pipe.

Preferably, an overflow port pipe is reserved on the conduction pipe;

the overflow port pipe is communicated with the overflow tank through a guide pipe and is used for guiding the calibration liquid higher than the overflow port pipe into the overflow tank.

Preferably, the apparatus further comprises a metering tank level gauge;

the metering tank liquid level meter is respectively connected with the conduction pipe and the liquid inlet pipe.

Preferably, the liquid inlet pipe is provided with a liquid inlet switch; the liquid outlet pipe is provided with a liquid outlet switch.

Preferably, the apparatus further comprises an overflow tank holder;

the overflow tank support is connected with the outer wall of the tank body of the metering tank and used for fixing the overflow tank.

The embodiment of the utility model provides a device of liquid volume accurate measurement, the device passes through the setting of overflow jar, the problem of the discharge of air or entering when pouring into or discharge calibration liquid of metering tank has been solved, make the inside and atmospheric pressure balance of whole device, the feed liquor pipe makes the inlet difficult to hold back gas with the setting that the inlet is first angle, the problem of oil-out trapped oil among the prior art has been solved in the setting that the drain pipe is the second angle with the liquid outlet, thereby the volume of liquid is markd in accurate measurement has been realized, also make the device can be used to the volumetric accurate examination of ground jar.

Drawings

Fig. 1 is a front view of an apparatus for accurately measuring a volume of a liquid according to an embodiment of the present invention;

fig. 2 is an internal piping diagram of a metering tank according to an embodiment of the present invention;

fig. 3 is a schematic view of a connection relationship between an overflow tank and a metering tank according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of an overflow tank provided by an embodiment of the present invention;

fig. 5 is a right side view of an overflow tank provided by an embodiment of the present invention.

Detailed Description

The technical solution of the present invention is further described in detail by the accompanying drawings and examples.

The embodiment of the utility model provides a pair of device of liquid volume accurate measurement can the volume of liquid is markd to the accurate measurement, utilizes the liquid volume that the volume of measurationing out to pass through a series of calculations again, can accurately examine and determine out ground jar volume.

Fig. 1 is a front view of an apparatus for accurately measuring a volume of liquid according to an embodiment of the present invention. It should be noted that two metering tanks are shown in the figure, but the number of the metering tanks is not limited to two, and may be one or more, and the volumes of the metering tanks may be different.

As shown in fig. 1, the apparatus for precisely metering the volume of liquid includes: metering tank 1, overflow tank 2, inlet 3 and liquid outlet 4.

The liquid inlet 3 is used for injecting calibration liquid.

The metering tank 1 is used for containing injected calibration liquid. Referring to fig. 2, the metering tank 1 includes a tank body 11, a tank door 12, a conical bottom 13, and an internal pipe 14.

In an alternative example, the top of the tank 11 is provided with a sealing head 110, and the sealing head 110 seals the tank 11.

The conical bottom 13 is arranged in the tank body 11. A first through hole (not shown) and a second through hole (not shown) are reserved on the cone bottom 13. The cone bottom 13 divides the inner space of the metering tank 1 into a holding cavity (not shown in the figure) for calibration liquid and an inner pipeline holding cavity (not shown in the figure); the holding cavity for the calibration liquid is communicated with the liquid inlet 3 through the liquid inlet pipe 30. The liquid inlet pipe 30 is connected with the liquid inlet 3 at a first angle, so that the problem that the liquid inlet 3 of the conventional metering tank 1 is blocked with air can be solved. The liquid inlet pipe 30 is provided with a liquid inlet switch 301. In a preferred example, a liquid level meter interface (not shown) is reserved on the liquid inlet pipe 30.

Of course, the position of the conical bottom 13 in the tank 11 can be varied depending on the size of the metering volume. The conical bottom 13 is preferably welded with the inner wall of the tank body 11, the arrangement of the conical bottom 13 enables the calibration liquid in the tank body 11 to be discharged completely as fast as possible, and meanwhile, inaccuracy of a metering result caused by oil storage of the metering tank 1 is avoided.

In a specific example, when the metering volume of the metering tank 1 is large, the height from the conical bottom 13 to the top of the tank 11 is larger than the height from the conical bottom 13 to the bottom of the tank 11. In this case, the liquid inlet pipe 30 may be directly extended into the conical bottom 13.

In another specific example, when the metering volume of the metering tank 1 is small, the height of the conical bottom 13 from the top of the tank 11 is smaller than the height of the conical bottom 13 from the bottom of the tank 11. Due to the arrangement, a larger storage space is reserved below the conical bottom 13, so that the operation tool can be conveniently placed, and as shown in fig. 2, the conical bottom 13 on the right side is the situation.

The inner pipe 14 is located in the inner pipe accommodating cavity and includes an elbow pipe 141, and one end of the elbow pipe 141 is connected to the first through hole, so that the calibration liquid of the cone bottom 13 can be discharged without residue.

The tank door 12 is arranged on the tank body 11 of the internal pipeline accommodating cavity and is used for opening and closing the internal pipeline accommodating cavity, so that maintenance and overhaul of parts in the tank body 11 are facilitated.

In an alternative example, when the volume of the metering tank 1 is small, the internal pipe 14 further includes a connecting pipe 142 and a tee 143. The connection pipe 142 is connected to the second through hole. Two ports of the tee pipe 143 are respectively connected to the connecting pipe 142 and the liquid inlet pipe 30. With the arrangement, when the calibration liquid is injected into the measuring tank 1 with a small measuring volume, the calibration liquid flows into the connecting pipe 142 and the elbow pipe 141 through the liquid inlet pipe 30 respectively, and then enters the space above the conical bottom 13, so that the unsmooth liquid inlet caused by the height of the conical bottom 13 from the top of the tank body 11 is avoided.

The overflow tank 2 is the passage for the discharge or intake of air when the metering tank 1 is injecting or discharging the calibration liquid. Referring to fig. 3, 4 and 5, the overflow tank 2 specifically includes a tank body 20, an overflow tank passage 21, a gas exchange pipe 22, a gas exchange port 23, an overflow tank liquid introduction port 24, a liquid replenishment pipe 25 and a liquid discharge pipe 26. The connection relationship and the function of each part are as follows:

as shown in the figures, tank body 20 includes a tank wall 201, a top end closure 202 and a bottom end closure 203 connected to tank wall 201, and a cone 204 that is perpendicular to tank wall 201.

In one specific example, the tank wall 201 is cylindrical, the top end closure 202 is convex, and the bottom end closure 203 is concave.

The cone 204 divides the interior region of the tank body 20 into a fluid replacement cavity 205 and an overflow cavity 206. Specifically, the fluid replenishing cavity 205 is located at the upper part of the tank body 20, and the overflow cavity 206 is located at the lower part of the tank body 20. The cone 204 and the tank wall 201 may be welded together. By way of example and not limitation, in the case that the height of the tank body 20 is not changed, in order to ensure that the liquid in the liquid replenishing cavity 205 is sufficient, the cone 204 may be moved by 2cm towards the bottom end socket 203.

The cone 204 and the top seal 202 are structurally arranged so that the liquid in the fluid infusion chamber 205 can be quickly and maximally discharged. The bottom head 203 is configured so that the liquid in the overflow chamber 206 is discharged as free as possible. Therefore, the structural arrangement of the tank body 20 improves the accuracy of the liquid volume metering.

The overflow tank channel 21 passes through the top end enclosure 202 and communicates with the metering tank 1 through the conduit 100. An overflow pipe 101 is reserved on the conduction pipe 100. The overflow pipe 101 communicates with the overflow chamber 206 via a conduit 102, and when the level of the injected calibration liquid is higher than the overflow pipe 101, the calibration liquid is introduced into the overflow chamber 206 via the conduit 102.

In a preferred example, a liquid level meter interface tube 103 is reserved on the conduction tube 100. The position of the liquid level interface tube 103 corresponds to the reserved liquid level meter interface on the liquid inlet tube 30.

When the liquid is injected into the metering tank 1, the air in the metering tank 1 is discharged to the liquid supplementing cavity 205 through the overflow tank channel 21, or when the liquid is discharged from the metering tank 1, the air enters the metering tank 1 through the overflow tank channel 21 again through the liquid supplementing cavity 205. The arrangement ensures that the gas retaining phenomenon cannot occur in the metering tank 1 and the overflow tank 2, and the metering accuracy is improved.

The gas exchange tube 22 is arranged on the cone 204 in a penetrating way, and can conduct the liquid supplementing cavity 205 and the overflow cavity 206; and air circulation between the liquid supplementing cavity 205 and the overflow cavity 206 is realized.

The gas exchange port 23 is located on one side of the tank wall 201 of the overflow chamber 206 and is mainly used for air discharge and air intake of the overflow tank 2. Specifically, when the metering tank 1 is filled with liquid, air entering the liquid replenishing cavity 205 enters the overflow cavity 206 through the gas exchange tube 22, and is then discharged to the atmosphere through the gas exchange port 23. When the liquid is discharged from the metering tank 1, the air enters the liquid supplementing cavity 205 through the gas exchange port 23, the overflow cavity 206 and the gas exchange pipe 22, and then enters the metering tank 1 through the overflow tank channel 21, so that the smooth discharge of the liquid from the metering tank 1 is ensured.

In a preferred example, to ensure that the gas in the overflow tank 2 is discharged from the gas exchange port 23 in time, the distance between the gas exchange port 23 and the gas exchange tube 22 can be shortened.

In addition, when the liquid is injected into the measuring tank 1, when the speed is too high or the injection pressure is too high, the liquid level in the measuring tank 1 rises too fast, and the liquid may enter the liquid supplementing cavity 205 of the tank body 20 through the overflow tank passage 21, which is beneficial to relieving the suffocation or safety problem caused by the too high pressure in the measuring tank 1.

When the level of the injected liquid is higher than the overflow pipe 11, as shown in fig. 3, the excess liquid will be introduced into the overflow cavity 206 through the external conduit 102 and then through the overflow liquid inlet 24. Therefore, the position of the overflow tank inlet 24 is necessarily lower than the position of the overflow port pipe 11, and otherwise, the excess liquid cannot be introduced from the measuring tank 1 into the overflow cavity 206 of the overflow tank 2. The number of the overflow tank liquid introduction ports 24 may be one or more, and is determined according to the number of the metering tanks 1.

The liquid supplementing pipe 25 is positioned at the bottom of the cone 204, and a liquid supplementing switch 250 is arranged on the liquid supplementing pipe 25. The liquid supplementing pipe 25 passes through one side of the tank wall 201 of the overflow cavity 206 and is communicated with the metering tank 1 through the liquid inlet pipe 30. Because bubbles may be generated in the process of injecting the liquid into the metering tank 1, when the amount of liquid occupied by the bubbles needs to be replenished into the metering tank 1, the liquid replenishing switch 250 can be opened to introduce the liquid in the liquid replenishing cavity 205 into the metering tank 1 through the liquid inlet pipe 30, so that the metering tank 1 is replenished with the liquid, and the accuracy of the volume of the metering tank 1 can be ensured.

The drain pipe 26 is arranged on the bottom end socket 203 in a penetrating way. The liquid drainage pipe 26 is provided with a liquid drainage switch 260. When there is too much liquid in overflow chamber 206 or when it is desired to empty the overflow chamber 206, drain switch 260 can be opened to allow liquid to drain out of overflow chamber 206.

In a preferred embodiment, the overflow tank 2 further comprises a drain 27. Specifically, when the plurality of metering tanks 1 are connected to the cone 204 in a penetrating manner, and when the liquid in the fluid infusion chamber is excessive, the liquid discharge pipe 27 leads the liquid in the fluid infusion chamber 205 out to the overflow chamber 206 in time, so that the liquid in the plurality of metering tanks 1 is prevented from mutually flowing through the overflow tank passage 21.

In a more preferable scheme, the height of the liquid discharge pipe 27 exposed out of the liquid supplementing cavity 205 is smaller than the height of the gas exchange pipe 22 exposed out of the liquid supplementing cavity 205, so that the liquid in the liquid supplementing cavity 205 cannot be discharged out of the external environment from the gas exchange pipe 22, and the normal metering work of the equipment is ensured.

In addition, the overflow tank 2 comprises two first connections 28, two second connections 29, a first level gauge (not shown) and a second level gauge (not shown).

The first interface 28 is positioned on the tank wall 201 at one side of the fluid infusion cavity 205; the first liquid level meters are respectively communicated with the two first interfaces 28 and are used for displaying the liquid level of the fluid infusion cavity 205, so that the liquid in the fluid infusion cavity 205 can be quantitatively infused into the metering tank 1 as required.

The second port 29 is located on the tank wall 201 on the side of the overflow cavity 206; the second liquid level meters are respectively communicated with the two second interfaces 29 and are used for displaying the liquid level of the overflow cavity 206. When the liquid in the overflow cavity 206 is too much, in order to avoid the liquid from being sprayed out from the gas exchange port 23, the liquid waste is caused, and the judgment can be made by observing the value of the second liquid level meter, and the redundant liquid is discharged in time.

The liquid outlet 4 is used for discharging calibration liquid in the metering tank 1 and/or the overflow tank 2.

Liquid outlet 4 switches on through drain pipe 40 with metering tank 1, and the one end of drain pipe 40 is the second angle with liquid outlet 4 and is connected, and the other end meets with elbow pipe 141, has solved the problem of depositing liquid when maring liquid discharge for it is more thorough to mark liquid discharge, has improved the device's measurement accuracy nature to a certain extent. Liquid outlet pipe 40 is provided with liquid outlet switch 401. Drain tube 40 and drain tube 26 are opened or closed by drain switch 260.

In an alternative example, when the volume of the measuring tank 1 is small, the outlet pipe 40 may be connected to a port of the tee 142, so that the inlet pipe 30, the connecting pipe 142, the outlet pipe 40 and the elbow pipe 141 are communicated with each other. Thus, even if one overflow tank 2 is connected to two metering tanks 1 having different metering volumes, it is not necessary to change the settings of the first angle and the second angle. At the same time, the filling and discharging of the calibration liquid in the measuring tank 1 having a small measuring volume is not affected.

In a preferred embodiment, the apparatus further comprises a metering tank level gauge (not shown). The measuring tank liquid level meter is respectively connected with a liquid level meter interface tube 103 on the conduction tube 100 and a liquid level meter interface on the liquid inlet tube 30, and is used for measuring the liquid level of the calibration liquid in the measuring tank 1.

In another preferred version, the apparatus further comprises an overflow tank holder 5. The overflow tank support 5 is connected with the outer wall of the tank body 11 of the metering tank 1. The overflow tank bracket 5 is arranged, so that the position of the liquid introducing port 24 of the overflow tank is always lower than that of the overflow port pipe 101, and the calibrated liquid can overflow into the overflow tank 2 conveniently. Meanwhile, the overflow tank 2 is convenient to fix, and the stability of the whole device is improved.

The components and their connections of the device for accurately measuring the volume of liquid are described above, and the working principle of the device is described in detail below. It should be noted that, when the number of the metering tanks 1 is plural, each of the metering tanks 1 is operated independently, and the operation process and the operation mode thereof are completely the same, except that the volumes of the metering tanks 1 are different, so that the volumes of the liquids metered by the plurality of metering tanks 1 are also different, and the operation principle of the apparatus will be specifically described below by taking one metering tank 1 as an example.

In step 1, when the liquid volume needs to be measured, all switches, such as the liquid lead-out switch 401, the liquid replenishment switch 250 and the liquid drainage switch 260, need to be turned off first.

Step 2, opening the liquid leading-in switch 301 to inject the calibration liquid into the liquid inlet 3, and along with the injection of the liquid, the calibration liquid flows into the metering tank 1 through the liquid inlet pipe 30;

at this time, the air in the measuring tank 1 enters the liquid supplementing cavity 205 of the overflow tank 2 through the conduction pipe 100 and the overflow tank channel 21, then enters the overflow cavity 206 through the gas exchange pipe 22, and finally is discharged into the atmosphere through the gas exchange port 23, so that the measuring tank 1 and the overflow tank 2 cannot be subjected to a gas holding phenomenon.

Step 3, as the injection amount of the calibration liquid in the metering tank 1 is increased continuously, when the liquid level of the injected calibration liquid exceeds the overflow port pipe 101, the calibration liquid flows into the overflow cavity 206 of the overflow tank 2 along the conduit 102.

During the calibration liquid injection, the liquid may be injected too fast or the injection pressure is too high, which may cause the liquid level in the measuring tank 1 to rise too fast, and at this time, the liquid enters the overflow tank passage 21 through the conducting pipe 100 and then enters the fluid replenishing cavity 205 of the overflow tank 2. However, this does not affect the normal operation of the entire device. Because when the liquid level in the replenishing chamber 205 exceeds the height of the drain 27, the liquid will enter the overflow chamber 206 through the drain 27. Since the height of the drain pipe 27 in the fluid infusion cavity 205 is lower than that of the gas exchange pipe 22 in the fluid infusion cavity 205, the phenomenon that the calibration liquid flows into the gas exchange pipe 22 due to the fact that the liquid level of the fluid infusion cavity 205 is too high is avoided.

And 4, when the liquid level of the calibration liquid in the metering tank 1 is stable, closing the liquid introduction switch 301, and stopping injecting the calibration liquid into the metering tank 1, so that the calibration liquid in the metering tank 1 is static, and the liquid level in the metering tank 1 may be lower than the position of the overflow port pipe 101 due to the possibility of air in the liquid injection process. Therefore, in order to ensure that the liquid level in the measuring tank 1 is maintained at the position of the overflow pipe 101, and further improve the accuracy of the measurement, liquid compensation is required.

And step 5, opening the liquid supplementing switch 250 to enable the liquid to flow into the liquid inlet pipe 30 through the liquid supplementing pipe 25 so as to be compensated into the metering tank 1, and quantitatively injecting the liquid into the metering tank 1 according to needs through the first liquid level meter, so that the metering accuracy is improved.

And 6, when the liquid level in the metering tank 1 reaches the position of the overflow port pipe 101, closing the liquid supplementing switches 250, wherein all the switches are in a closed state, and completing one-time liquid volume metering. The total volume of calibration liquid measured includes: all the liquid in the liquid inlet pipe 30 from the liquid inlet switch 301 to the position of the overflow pipe 101 and the elbow pipe 141 to the position of the liquid outlet switch 40 is the liquid volume to be measured.

And 7, opening a liquid outlet switch 401, discharging the calibration liquid through a liquid outlet 4, wherein the air to be compensated enters an overflow cavity 206 from a gas exchange port 23, enters a liquid supplementing cavity 205 through a gas exchange pipe 23, and finally enters a conducting pipe 100 through an overflow tank channel 21, so as to enter the metering tank 1.

The steps 1-7 are repeated in such a way, so that the continuous metering of the liquid can be realized, and the metering precision is very high.

Finally, after the metering operation is completed, the liquid discharge switch 260 is opened, so that the calibration liquid in the overflow cavity 206 is discharged into the liquid outlet pipe 40 through the liquid discharge pipe 26, and finally discharged through the liquid outlet 4.

Of course, when the second liquid level meter indicates that the liquid in the overflow cavity 206 is too much, the liquid discharge switch 260 may be opened to discharge the liquid through the liquid discharge pipe 26, so that the liquid does not flow back into the measuring tank 1 or be sprayed out from the gas exchange port 23.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. An apparatus for accurately metering a volume of liquid, the apparatus comprising:

the liquid inlet is used for injecting calibration liquid;

2. The apparatus of claim 1, wherein the metering tank comprises a tank body, a conical bottom, an internal conduit, and a tank door;

3. The device of claim 2, wherein a second through hole is reserved on the conical bottom; the inner conduit further comprises: a connecting pipe and a three-way pipe;

4. The apparatus of claim 1, wherein the overflow tank comprises:

5. The apparatus of claim 4, wherein the fluid supply pipe is in communication with the fluid inlet pipe; and a liquid supplementing switch is arranged on the liquid supplementing pipe.

6. The apparatus of claim 4, wherein the drain tube is in communication with the drain tube; and a liquid drainage switch is arranged on the liquid drainage pipe.

7. The apparatus of claim 1, wherein an overflow port pipe is reserved on the conduction pipe;

8. The apparatus of claim 1, further comprising a metering tank level gauge;

9. The apparatus of claim 1, wherein the liquid inlet pipe has a liquid introduction switch; the liquid outlet pipe is provided with a liquid outlet switch.

10. The apparatus of claim 1, further comprising an overflow tank holder;