Differential pressure type liquid level sensor

Abstract

The utility model relates to the technical field of liquid level detection, in particular to a differential pressure type liquid level sensor which comprises a ventilation chamber shell, a tumbler type floating disc, a downward extending pipe and a differential pressure transmitter. According to the utility model, the ventilation chamber shell is supported by the tumbler type floating disc, so that the ventilation chamber shell can be well placed on the water surface, and the top end of the downward extending pipe extends into the ventilation chamber shell, so that the ventilation chamber shell can be placed on the water surface only by utilizing the pressure difference transmitter to detect the difference between the air pressure in the ventilation chamber shell and the air pressure at the top end of the downward extending pipe; the liquid level sensor can obtain required liquid level information, and is very convenient when being applied to open rivers and central positions of large containers.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level detection, in particular to a pressure difference type liquid level sensor. Background Art

[0002] A differential pressure level gauge is a device that uses the pressure generated by a liquid column to measure the height of the liquid. Specifically, one end of the detection (the high-pressure end) is located inside the liquid and is affected by both air pressure and hydraulic pressure, while the other end (the low-pressure end) is only affected by air pressure. The pressure difference between the two ends is obtained by the differential pressure transmitter, and the liquid level information is obtained through data processing.

[0003] The high-pressure end and the low-pressure end of the differential pressure liquid level sensor are located at two upper and lower positions. When in use, it is necessary to ensure that the low-pressure end does not contact the fluid. In some cases, such as open rivers and the center of a large container, it is not convenient to install the low-pressure end. For this reason, the utility model provides a new type of differential pressure liquid level sensor. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a differential pressure liquid level sensor.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solution: a differential pressure liquid level sensor, comprising:

[0006] A vent chamber housing;

[0007] A tumbler-type floating plate, wherein the ventilation chamber shell is fixedly mounted on the upper end surface of the tumbler-type floating plate;

[0008] A down extension pipe, wherein the down extension pipe is fixedly connected to the tumbler-type floating plate, and the upper end of the down extension pipe penetrates through the penetration hole at the bottom of the ventilation chamber shell and then extends to the interior of the ventilation chamber shell;

[0009] A differential pressure transmitter, wherein the differential pressure transmitter is fixedly connected to the housing of the ventilation chamber, and a first detection end and a second detection end of the differential pressure transmitter are both located inside the housing of the ventilation chamber;

[0010] The first detection end is used to detect the air pressure inside the housing of the ventilation chamber, and the second detection end is used to detect the air pressure at the upper port of the lower extension pipe.

[0011] As a further description of the above technical solution:

[0012] The ventilation chamber housing comprises:

[0013] A conical shell, wherein the bottom end of the conical shell is open, a plurality of side holes are opened on the side of the conical shell, and an overflow hole is opened on the side of the conical shell near the bottom end;

[0014] A conical inner shell, the conical inner shell is located inside the conical outer shell, and the bottom end of the conical inner shell is open, and a vent hole is opened on the side of the conical inner shell near the top end, and the vent hole is located above the uppermost end of the side hole;

[0015] The bottom plate, the bottom ports of the conical outer shell and the conical inner shell are fixedly connected to the bottom plate, and the penetration hole is opened at the center of the bottom plate.

[0016] As a further description of the above technical solution:

[0017] The portion of the bottom plate located outside the conical shell forms a flange, and a mounting hole is provided on the end surface of the flange.

[0018] As a further description of the above technical solution:

[0019] The top end of the conical outer shell and the top end of the conical inner shell are fixed together to form a common end surface, and a threaded connection hole is provided on the common end surface.

[0020] As a further description of the above technical solution:

[0021] The bottom of the tumbler-type floating plate is in an inverted cone shape, a center hole is opened in the center of the tumbler-type floating plate, and the lower extension pipe is fixedly installed on the inner side of the center hole.

[0022] As a further description of the above technical solution:

[0023] The lower extension pipe comprises an upper pipe body, a retractable hose, a lower pipe body, and a protective plate which are fixedly connected in sequence from top to bottom;

[0024] A communication opening is provided on the side of the protection plate near the top.

[0025] As a further description of the above technical solution:

[0026] The top end of the differential pressure transmitter is provided with an output wire harness extending upward, and the bottom end of the differential pressure transmitter is provided with a threaded connector matched with a threaded connection hole.

[0027] The utility model has the following beneficial effects:

[0028] 1. Compared with the prior art, this differential pressure liquid level sensor uses a tumbler-type float to support the ventilation chamber shell, so that the ventilation chamber shell can be well placed on the water surface, and the top end of the downtube is extended to the inside of the ventilation chamber shell. In this way, it is only necessary to use a differential pressure transmitter to detect the air pressure difference between the inside of the ventilation chamber shell and the air pressure at the top end of the downtube to obtain the required liquid level information, which is very convenient when used in open rivers and the center of larger containers.

[0029] 2. Compared with the prior art, this differential pressure liquid level sensor improves the structure of the ventilation chamber shell and adopts an inner and outer double-layer (conical outer shell, conical inner shell) structure. The top of the side hole opened on the outside is located below the air hole opened on the inside. In this way, it is not easy for liquid to enter the interior of the ventilation chamber shell (referring to the interior of the conical inner shell), thereby ensuring the accuracy of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A three-dimensional diagram of a differential pressure liquid level sensor proposed by the utility model;

[0031] Figure 2 This is a front view of a differential pressure liquid level sensor proposed by the utility model;

[0032] Figure 3 This is a top view of a differential pressure liquid level sensor proposed by the utility model;

[0033] Figure 4 for Figure 3 Section view of the section line at BB;

[0034] Figure 5 for Figure 4 A partial enlarged view of the middle part;

[0035] Figure 6 The utility model is a schematic cross-sectional view of a ventilation chamber shell of a differential pressure liquid level sensor.

[0036] Legend:

[0037] 1. Ventilation chamber shell; 101. Conical outer shell; 102. Side hole; 103. Conical inner shell; 104. Air vent; 105. Overflow hole; 106. Bottom plate; 107. Insertion hole; 108. Threaded connection hole; 2. Tumbler-type float; 3. Center hole; 4. Lower extension tube; 401. Upper tube body; 402. Retractable hose; 403. Lower tube body; 404. Protective plate; 5. Differential pressure transmitter; 501. First detection end; 502. Second detection end; 6. Output harness. DETAILED DESCRIPTION

[0038] Reference Figure 1-Figure 6The utility model provides a differential pressure liquid level sensor, comprising: a ventilation chamber shell 1, a tumbler-type float 2, a down-extending tube 4, and a differential pressure transmitter 5; wherein the ventilation chamber shell 1 is fixedly mounted on the upper end surface of the tumbler-type float 2, the tumbler-type float 2 is not easy to flip over on the liquid surface, so that the ventilation chamber shell 1 will not fall into the water, the down-extending tube 4 is fixedly connected to the tumbler-type float 2, and the upper end of the down-extending tube 4 passes through the penetration hole 107 at the bottom of the ventilation chamber shell 1 and then extends to the interior of the ventilation chamber shell 1, the differential pressure transmitter 5 is fixedly connected to the ventilation chamber shell 1, and the first detection end 501 and the second detection end 502 of the differential pressure transmitter 5 are both located inside the ventilation chamber shell 1, the first detection end 501 is used to detect the air pressure inside the ventilation chamber shell 1, and the second detection end 502 is used to detect the air pressure at the upper end of the down-extending tube 4.

[0039] Since a tumbler-type float 2 is used for floating, installation is no longer required and the device can be placed on the liquid surface at the center of an open river or a larger container, thereby facilitating liquid level detection. When in use, the bottom end of the lower extension tube is fixed at a water level of a suitable height, such as the bottom of a river or a container, or at a position at a preset height from the bottom of a river or a container, and the tumbler-type float 2 and the ventilation chamber shell 1 and the differential pressure transmitter 5 above are placed on the water surface. The top of the differential pressure transmitter 5 has an output harness 6 extending upward, which outputs the detected differential pressure signal, which is processed by a processing device to obtain water depth information (the processor is an existing processing device, and the parameters used are all preset parameters).

[0040] In one embodiment, the ventilation chamber shell 1 includes: a conical outer shell 101, a conical inner shell 103, and a bottom plate 106; wherein, the bottom end of the conical outer shell 101 is open, a plurality of side holes 102 are provided on the side of the conical outer shell 101, an overflow hole 105 is provided on the side of the conical outer shell 101 and near the bottom end, the conical inner shell 103 is located on the inner side of the conical outer shell 101, and the bottom end of the conical inner shell 103 is open, an air vent 104 is provided on the side of the conical inner shell 103 and near the top end, the air vent 104 is located above the uppermost end of the side hole 102, the bottom ports of the conical outer shell 101 and the conical inner shell 103 are fixedly connected to the bottom plate 106, and the penetration hole 107 is provided at the center of the bottom plate 106.

[0041] The purpose of setting the conical outer shell 101 and the conical inner shell 103 to be conical is to facilitate the water falling on the side to flow downward. The design of the side holes 102 and the air holes 104 ensures that the interior of the conical inner shell 103 is always connected with the outside, and part of the water that passes through the side of the conical outer shell 101 enters the area between the conical outer shell 101 and the conical inner shell 103. Since the air holes 104 are located above the upper end of the side holes 102, this part of the water cannot enter the interior of the conical inner shell 103, and flows downward in the conical inner shell 103 and is finally discharged through the overflow hole 105, thereby ensuring that the interior of the conical inner shell 103 is breathable and not easy to get water in.

[0042] The portion of the bottom plate 106 located outside the conical housing 101 forms a flange, and a mounting hole is provided on the end surface of the flange so that the bottom plate 106 and the tumbler-type floating plate 2 can be fixed together by screws.

[0043] The top of the conical outer shell 101 and the top of the conical inner shell 103 are fixed together to form a common end surface, and a threaded connection hole 108 is opened on the common end surface. The bottom end of the differential pressure transmitter 5 has a threaded joint that cooperates with the threaded connection hole 108, so as to facilitate the installation of the differential pressure transmitter 5 and the ventilation chamber shell, and can ensure that the first detection end 501 and the second detection end 502 of the differential pressure transmitter 5 are both located inside the ventilation chamber shell 1.

[0044] In one embodiment, the bottom of the tumbler-type floating plate 2 is in an inverted cone shape, a center hole 3 is opened in the center of the tumbler-type floating plate 2, and a lower extension pipe 4 is fixedly installed on the inner side of the center hole 3.

[0045] In one embodiment, the down tube 4 includes an upper tube body 401, a retractable hose 402, a lower tube body 403, and a protective plate 404 which are fixedly connected in sequence from top to bottom; a connecting port is provided on the side of the protective plate 404 near the top, and the connecting port is the bottom opening of the protective plate 404. Relying on the telescopic performance of the retractable hose 402, it is possible to ensure that the down tube 4 has the characteristics of being extendable and contractible, so there is no need to design a longer pipeline to meet the problem that the tumbler-type floating plate 2 drives the top of the down tube 4 to move up and down as the liquid level rises and falls.

[0046] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A differential pressure liquid level sensor, characterized in that: include: A ventilation chamber housing (1); A tumbler-type floating plate (2), wherein the ventilation chamber shell (1) is fixedly mounted on the upper end surface of the tumbler-type floating plate (2); A lower extension pipe (4), the lower extension pipe (4) being fixedly connected to the tumbler-type floating plate (2), and the upper end of the lower extension pipe (4) passing through the penetration hole (107) at the bottom of the ventilation chamber shell (1) and then extending into the interior of the ventilation chamber shell (1); A differential pressure transmitter (5), the differential pressure transmitter (5) being fixedly connected to the ventilation chamber housing (1), and a first detection end (501) and a second detection end (502) of the differential pressure transmitter (5) being both located inside the ventilation chamber housing (1); The first detection end (501) is used to detect the air pressure inside the ventilation chamber shell (1), and the second detection end (502) is used to detect the air pressure at the upper end of the lower extension tube (4).

2. A differential pressure liquid level sensor according to claim 1, characterized in that: The ventilation chamber housing (1) comprises: A conical outer shell (101), wherein the bottom end of the conical outer shell (101) is open, a plurality of side holes (102) are provided on the side of the conical outer shell (101), and a water overflow hole (105) is provided on the side of the conical outer shell (101) near the bottom end; A conical inner shell (103), the conical inner shell (103) being located inside the conical outer shell (101), and the bottom end of the conical inner shell (103) being open, and a vent hole (104) being provided on the side of the conical inner shell (103) and close to the top end, and the vent hole (104) being located above the uppermost end of the side hole (102); The bottom plate (106) is provided with a bottom port of the conical outer shell (101) and the bottom port of the conical inner shell (103) being fixedly connected to the bottom plate (106), and the penetration hole (107) is provided at the center of the bottom plate (106).

3. A differential pressure liquid level sensor according to claim 2, characterized in that: The portion of the bottom plate (106) located outside the conical housing (101) forms a flange, and a mounting hole is provided on the end surface of the flange.

4. A differential pressure liquid level sensor according to claim 2, characterized in that: The top end of the conical outer shell (101) and the top end of the conical inner shell (103) are fixed together to form a common end surface, and a threaded connection hole (108) is provided on the common end surface.

5. The differential pressure liquid level sensor according to claim 1, characterized in that: The bottom of the tumbler-type floating plate (2) is in an inverted cone shape, a center hole (3) is opened at the center of the tumbler-type floating plate (2), and the lower extension pipe (4) is fixedly installed on the inner side of the center hole (3).

6. A differential pressure liquid level sensor according to claim 1, characterized in that: The lower extension tube (4) comprises an upper tube body (401), a retractable hose (402), a lower tube body (403), and a protective plate (404) which are fixedly connected in sequence from top to bottom; A communication opening is provided on the side of the protection plate (404) and close to the top.

7. A differential pressure liquid level sensor according to claim 4, characterized in that: The top end of the differential pressure transmitter (5) has an output wiring harness (6) extending upward, and the bottom end of the differential pressure transmitter (5) has a threaded connector that matches the threaded connection hole (108).

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