Liquid level detection device

Abstract

The utility model provides a liquid level detection device for a storage tank, comprising: a first measuring tube, one end of which extends upward into the storage tank; a second measuring tube, one end of which extends upward into the storage tank, and one end of the first measuring tube is higher than one end of the second measuring tube in the storage tank; a first pressure-leading tube; a first input tube, which is used to input a liquid medium, and the other end of the first measuring tube, the first pressure-leading tube and the first input tube are connected; a second pressure-leading tube; a second input tube, which is used to input a liquid medium, and the other end of the second measuring tube, the second pressure-leading tube and the second input tube are connected; a transmitter, which is connected to the first pressure-leading tube and the second pressure-leading tube respectively. The utility model can accurately detect the liquid levels of various liquids in a storage tank, and the precision and accuracy of the measurement are not affected by the volatile and crystallizable characteristics of the liquid.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level measurement, in particular to a liquid level detection device. Background Art

[0002] Reactors are broadly understood as containers for physical or chemical reactions. Reactors are widely used in the fields of petroleum, chemical industry, rubber, pesticides, dyes, medicine and food. They are pressure vessels used to complete processes such as sulfidation, nitration, hydrogenation, hydrocarbonization, polymerization and condensation. The height of the liquid solution in the container is called the liquid level. The instrument for measuring the liquid level is called a level gauge. The level gauge is a type of level instrument. The types of level gauges mainly include tuning fork vibration level gauges, electric float level gauges, air-blowing level gauges, magnetic flap level gauges and radar level gauges. Each type of level gauge has its own applicable occasions.

[0003] In some cases, the existing liquid level gauges in reactors still have deficiencies in actual use. Some liquids in reactors are easy to volatilize, and after volatilization, they are easy to crystallize. If crystals are formed on the various liquid level gauges mentioned above, such as the tuning fork of a tuning fork vibrating liquid level gauge, or the float of an electric float liquid level gauge, the measurement precision and accuracy of the liquid level gauge will be seriously affected, making it impossible for the liquid level gauge to measure effectively. Utility Model Content

[0004] The utility model aims to provide a liquid level detection device, which can accurately detect the liquid levels of various liquids in a storage tank, and the measurement precision and accuracy are not affected by the volatility and crystallization characteristics of the liquid.

[0005] In order to achieve the above object, the utility model provides a liquid level detection device for a storage tank, the liquid level detection device comprising:

[0006] a first measuring tube, one end of which extends upward into the storage tank;

[0007] a second measuring tube, one end of which extends upward into the storage tank, and one end of the first measuring tube is higher than one end of the second measuring tube in the storage tank;

[0008] The first pressure-inducing pipe;

[0009] A first input tube, which is used to input liquid medium, and the other end of the first measuring tube, the first pressure-inducing tube and the first input tube are connected;

[0010] The second pressure-introducing pipe;

[0011] A second input pipe, which is used to input the liquid medium, and the other end of the second measuring pipe, the second pressure-inducing pipe and the second input pipe are connected;

[0012] A transmitter is connected to the first pressure-inducing pipe and the second pressure-inducing pipe respectively.

[0013] Optionally, the inner diameter of the first measuring tube is the same as the inner diameter of the second measuring tube.

[0014] Optionally, the first measuring tube is connected to the bottom of the storage tank via a first flange, and the second measuring tube is connected to the bottom of the storage tank via a second flange.

[0015] Optionally, the first pressure-leading pipe is connected to the low-pressure side of the transmitter, and the second pressure-leading pipe is connected to the high-pressure side of the transmitter.

[0016] Optionally, both the first input pipe and the second input pipe are provided with a one-way valve.

[0017] Optionally, both the first input pipe and the second input pipe are provided with flow meters.

[0018] Optionally, one end of the second measuring tube is opened upward.

[0019] Optionally, the height position of the transmitter is lower than the height position of one end of the second measuring tube.

[0020] Optionally, both the first input pipe and the second input pipe are provided with stop valves.

[0021] Optionally, the other end of the first measuring tube, the first pressure-inducing tube and the first input tube are connected via a first three-way pipe fitting, and the other end of the second measuring tube, the second pressure-inducing tube and the second input tube are connected via a second three-way pipe fitting.

[0022] As configured above, through the arrangement of the first measuring tube, the second measuring tube, the first pressure-introducing tube, the second pressure-introducing tube, the first input tube and the second input tube, the liquid medium is continuously introduced into the storage tank when measuring the liquid level, thereby preventing the liquid in the storage tank from flowing into the first measuring tube and the second measuring tube, and ensuring the accuracy of the liquid level measurement. It is understandable that if the liquid in the storage tank flows into the first measuring tube and the second measuring tube, it will cause an error in the measurement of the liquid level. The utility model connects the first pressure-introducing tube and the second pressure-introducing tube to the low-pressure side and the high-pressure side of the transmitter respectively, thereby measuring the pressure difference between the low-pressure side and the high-pressure side of the transmitter, and then uses the relationship between the pressure difference and the liquid level height in the storage tank to calculate the liquid level height in the storage tank. The liquid level detection device of the utility model can accurately detect the liquid levels of various liquids in the storage tank, and the measurement precision and accuracy are not affected by the volatility and crystallization characteristics of the liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Those skilled in the art should understand that the drawings provided are for a better understanding of the present invention and do not constitute any limitation on the scope of the present invention.

[0024] Figure 1 It is a schematic diagram of a liquid level detection device according to an embodiment of the present utility model.

[0025] The reference numerals are as follows:

[0026] 11-first measuring tube; 12-first pressure-leading tube; 13-first input tube; 14-first flange; 15-first three-way pipe fitting; 21-second measuring tube; 22-second pressure-leading tube; 23-second input tube; 24-second flange; 25-second three-way pipe fitting; 3-storage tank; 4-transmitter; 5-check valve; 6-flow meter; 7-stop valve; 8-main input tube; 81-third three-way pipe fitting. DETAILED DESCRIPTION

[0027] In this document, unless otherwise specified, the terms "upper", "lower", "left", "right", "inside", "outside", "front", "back", "top", "bottom", etc. are used to indicate directions or positional relationships based on the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction and operation. Therefore, they cannot be understood as limiting the present invention.

[0028] The following will describe the specific implementation of the utility model in more detail with reference to the schematic diagram. The advantages and features of the utility model will become clearer according to the following description. It should be noted that the drawings are all in a very simplified form and are not in exact proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the utility model.

[0029] Figure 1 This is a schematic diagram of a liquid level detection device according to an embodiment of the present invention. Figure 1 The embodiment of the utility model provides a liquid level detection device, which is applicable to a storage tank. For example, the storage tank 3 can be a reactor. The broad understanding of a reactor is a container for physical or chemical reactions. The liquid level detection device includes a first measuring tube 11, a second measuring tube 21, a first pressure-inducing tube 12, a first input tube 13, a second pressure-inducing tube 22, a second input tube 23 and a transmitter 4.

[0030] One end of the first measuring tube 11 extends upward into the storage tank 3 .

[0031] One end of the second measuring tube 21 extends upward into the storage tank 3, and one end of the first measuring tube 11 is higher than one end of the second measuring tube 21 in the storage tank 3. It can be understood that one end of the second measuring tube 21 and one end of the first measuring tube 11 are both open to the top. In other embodiments, one end of the first measuring tube 11 may not be open to the top, for example, one end of the first measuring tube 11 may also be open to the horizontal direction or to the top or to the bottom. Further, the inner diameter of the first measuring tube 11 is the same as the inner diameter of the second measuring tube 21. The first measuring tube 11 is connected to the bottom of the storage tank 3 through the first flange 14, and the second measuring tube 21 is connected to the bottom of the storage tank 3 through the second flange 24. In other embodiments, the first measuring tube 11 and the second measuring tube 21 may also be connected to the storage tank 3 in other ways.

[0032] The first input pipe 13 is used to input liquid medium, and the other end of the first measuring pipe 11, the first pressure-inducing pipe 12 and the first input pipe 13 are connected. Specifically, for example, the other end of the first measuring pipe 11, the first pressure-inducing pipe 12 and the first input pipe 13 are connected through a first three-way pipe 15.

[0033] The second input pipe 23 is used to input liquid medium. It can be understood that the reactor contains a mixed liquid required for physical or chemical reactions, and the liquid medium input by the first input pipe 13 and the second input pipe 23 is one of the liquids required for physical or chemical reactions in the reactor. The other end of the second measuring tube 21, the second pressure-introducing pipe 22 and the second input pipe 23 are connected. Specifically, for example, the other end of the second measuring tube 21, the second pressure-introducing pipe 22 and the second input pipe 23 are connected through a second three-way pipe 25.

[0034] The transmitter 4 is connected to the first pressure-inducing pipe 12 and the second pressure-inducing pipe 22 respectively. Further, the first pressure-inducing pipe 12 is connected to the low-pressure side of the transmitter 4, and the second pressure-inducing pipe 22 is connected to the high-pressure side of the transmitter 4. It can be understood that the height position of the transmitter 4 is lower than the height position of one end of the second measuring tube 21, so that the liquid medium in the second pressure-inducing pipe 22 can reach the transmitter 4.

[0035] Furthermore, both the first input pipe 13 and the second input pipe 23 are provided with a one-way valve 5, which allows the liquid to flow into the storage tank 3 and prevents the liquid from flowing back to the input end of the first input pipe 13 or the second input pipe 23. For example, when flushing the first measuring pipe 11, the second measuring pipe 21, the first input pipe 13 and the second input pipe 23, the cleaning liquid is input from the first input pipe 13 and the second input pipe 23 and flows to the first measuring pipe 11 and the second measuring pipe 21. When the flushing pressure of the cleaning liquid is low or there is no flushing pressure, the one-way valve 5 can prevent the liquid in the storage tank 3 from flowing back into the first measuring pipe 11 and the second measuring pipe 21.

[0036] Furthermore, the first input pipe 13 and the second input pipe 23 are both provided with a flow meter 6. It can be understood that the liquid medium flows in the first input pipe 13 and the second input pipe 23. Since the liquid medium is one of the liquids required for the physical or chemical reaction in the reactor, the input flow rate of the liquid medium can be properly controlled to allow the physical or chemical reaction in the reactor to proceed normally. The flow meter 6 is provided to monitor the flow rate of the liquid medium in the first input pipe 13 and the second input pipe 23 in real time, which is conducive to accurately controlling the input amount of the liquid medium and allowing the physical or chemical reaction in the reactor to proceed normally. In this embodiment, the inner diameter of the first measuring pipe 11 is the same as the inner diameter of the second measuring pipe 21, and the inner diameter of the first input pipe 13 is the same as the inner diameter of the second input pipe 23. When measuring the liquid level in the storage tank 3, the readings of the flow meters 6 on the first input pipe 13 and the second input pipe 23 are the same, so that the liquid flow rates in the first measuring pipe 11 and the second measuring pipe 21 are the same, which plays a balancing role on the low-pressure side and the high-pressure side of the transmitter 4, so that the liquid level measured by the utility model is accurate.

[0037] For example, the liquid static pressure formula can be used to calculate the liquid level in the storage tank 3. Let ΔP be the pressure difference between the high-pressure side of the transmitter 4 and the low-pressure side of the transmitter 4 measured by the transmitter 4, H be the height difference between one end of the first measuring tube 11 and one end of the second measuring tube 21, and h be the liquid level in the storage tank 3. H and h have been Figure 1 In the figure, ρ is the density of the mixed liquid in the storage tank 3, and ρ0 is the density of the liquid medium in the first measuring tube 11 and the second measuring tube 21. Then ΔP=ρgh-ρ0gH, and ΔP, ρ, ρ0 and H are all known, so the liquid level height h in the storage tank 3 can be calculated. Generally speaking, the height position of one end of the second measuring tube 21 is approximately equal to the lowest liquid level in the storage tank 3, that is, the height position of one end of the second measuring tube 21 is located at the bottom of the storage tank 3. When the device of the utility model measures the liquid level, the liquid level needs to be above one end of the second measuring tube 21, and the liquid level is not higher than one end of the first measuring tube 11.

[0038] Preferably, both the first input pipe 13 and the second input pipe 23 are provided with a stop valve 7. For example, when cleaning the storage tank 3, the stop valves 7 on the first input pipe 13 and the second input pipe 23 are closed, the opening provided on the storage tank 3 is opened, and the cleaning liquid is poured into the opening on the storage tank 3, thereby cleaning the inside of the storage tank 3.

[0039] Furthermore, the first input pipe 13 and the second input pipe 23 can intersect with a main input pipe 8, and the first input pipe 13, the second input pipe 23 and the main input pipe 8 are connected through a third three-way pipe fitting 81, and the liquid medium is input from the main input pipe 8 and diverted to the first input pipe 13 and the second input pipe 23 through the third three-way pipe fitting 81.

[0040] As configured above, through the arrangement of the first measuring tube 11, the second measuring tube 21, the first pressure-introducing tube 12, the second pressure-introducing tube 22, the first input tube 13 and the second input tube 23, when measuring the liquid level, the liquid medium is continuously introduced into the storage tank 3, thereby preventing the liquid in the storage tank 3 from flowing into the first measuring tube 11 and the second measuring tube 21, and ensuring the accuracy of the liquid level measurement. It can be understood that if the liquid in the storage tank 3 flows into the first measuring tube 11 and the second measuring tube 21, it will cause an error in the measurement of the liquid level. The utility model connects the low-pressure side and the high-pressure side of the transmitter 4 respectively through the first pressure-introducing tube 12 and the second pressure-introducing tube 22, thereby measuring the pressure difference between the low-pressure side and the high-pressure side of the transmitter 4, and then uses the relationship between the pressure difference and the liquid level height in the storage tank 3 to calculate the liquid level height in the storage tank 3. This liquid level detection device of the utility model can accurately detect the liquid levels of various liquids in the storage tank, and the measurement precision and accuracy are not affected by the volatility and crystallization characteristics of the liquid.

[0041] It should be noted that references to "one embodiment", "an embodiment", "a specific embodiment", "some embodiments", etc. in the specification only indicate that the described embodiment may include a particular feature, structure or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment. In addition, when a particular feature, structure or characteristic is described in conjunction with an embodiment, whether or not explicitly described, it is within the knowledge of a person skilled in the relevant art to implement such feature, structure or characteristic in conjunction with other embodiments.

[0042] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0043] It should also be noted that, although the present invention has been disclosed as a preferred embodiment, the above embodiment is not intended to limit the present invention. For any technician familiar with the art, without departing from the scope of the technical solution of the present invention, the above disclosed technical content can be used to make many possible changes and modifications to the technical solution of the present invention, or modified into equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

[0044] It should also be understood that, unless otherwise specified or indicated, the terms "first", "second", "third", etc. in the specification are merely used to distinguish between the various components, elements, steps, etc. in the specification, and are not used to indicate the logical relationship or sequential relationship between the various components, elements, steps, etc.

[0045] It should also be recognized that the terms described herein are only used to describe specific embodiments and are not used to limit the scope of the utility model. It must be noted that the singular forms "one" and "a kind" used herein and in the appended claims include plural references unless the context clearly indicates the opposite meaning. For example, a reference to "a step" or "a device" means a reference to one or more steps or devices, and may include secondary steps and secondary devices. All conjunctions used should be understood in the broadest sense. And, the word "or" should be understood to have a logical "or" definition, rather than a logical "exclusive or" definition, unless the context clearly indicates the opposite meaning. In addition, the implementation of the method and / or device in the embodiment of the utility model may include performing the selected task manually, automatically, or in combination.

Claims

1. A liquid level detection device for a storage tank, characterized in that: include: a first measuring tube, one end of which extends upward into the storage tank; a second measuring tube, one end of which extends upward into the storage tank, and one end of the first measuring tube is higher than one end of the second measuring tube in the storage tank; The first pressure-inducing pipe; A first input tube, which is used to input liquid medium, and the other end of the first measuring tube, the first pressure-inducing tube and the first input tube are connected; The second pressure-introducing pipe; A second input pipe, which is used to input the liquid medium, and the other end of the second measuring pipe, the second pressure-inducing pipe and the second input pipe are connected; A transmitter is connected to the first pressure-inducing pipe and the second pressure-inducing pipe respectively.

2. The liquid level detection device according to claim 1, characterized in that: The inner diameter of the first measuring tube is the same as the inner diameter of the second measuring tube.

3. The liquid level detection device according to claim 1, characterized in that: The first measuring tube is connected to the bottom of the storage tank via a first flange, and the second measuring tube is connected to the bottom of the storage tank via a second flange.

4. The liquid level detection device according to claim 1, characterized in that: The first pressure-introducing pipe is connected to the low-pressure side of the transmitter, and the second pressure-introducing pipe is connected to the high-pressure side of the transmitter.

5. The liquid level detection device according to claim 1, characterized in that: The first input pipe and the second input pipe are both provided with a one-way valve.

6. The liquid level detection device according to claim 1, characterized in that: The first input pipe and the second input pipe are both provided with flow meters.

7. The liquid level detection device according to claim 1, characterized in that: One end of the second measuring tube is opened upward.

8. The liquid level detection device according to claim 1, characterized in that: The height position of the transmitter is lower than the height position of one end of the second measuring tube.

9. The liquid level detection device according to claim 1, characterized in that: The first input pipe and the second input pipe are both provided with stop valves.

10. The liquid level detection device according to claim 1, characterized in that: The other end of the first measuring tube, the first pressure-inducing tube and the first input tube are connected through a first three-way pipe fitting, and the other end of the second measuring tube, the second pressure-inducing tube and the second input tube are connected through a second three-way pipe fitting.

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