CN105841774B

CN105841774B - Defoaming mechanism for liquid level detection, liquid level detection device and evaporation device

Info

Publication number: CN105841774B
Application number: CN201610218258.8A
Authority: CN
Inventors: 于华涛
Original assignee: Shenzhen Woweisi Env Prot Tech Co ltd
Current assignee: Shenzhen Woweisi Env Prot Tech Co ltd
Priority date: 2016-04-08
Filing date: 2016-04-08
Publication date: 2022-05-20
Anticipated expiration: 2036-04-08
Also published as: CN105841774A

Abstract

The invention discloses a defoaming mechanism for liquid level detection, which comprises a chamber (1) and blades (2); the front part of the chamber (1) comprises a divergent opening (11); the blades (2) are arranged at the bottom of the opening (11); the blade (2) can rotate around the axis thereof. The defoaming mechanism can eliminate the influence of foam and liquid level fluctuation under the condition of not consuming external energy, so that the liquid level meter can accurately detect the liquid level.

Description

Defoaming mechanism for liquid level detection, liquid level detection device and evaporation device

Technical Field

The invention relates to the field of liquid measurement, in particular to a defoaming mechanism for liquid level detection. The invention also relates to a liquid level detection device and an evaporation device comprising the liquid level detection device.

Background

In various processing technologies in modern industry, such as beer fermentation, industrial wastewater treatment and the like, the liquid level in the tank body is always in a state of fluctuation of bubbles due to boiling or stirring and the like, and the liquid level condition is very different according to the temperature and the liquid flowing condition in the tank body, so that the liquid amount in the tank body is difficult to measure by a common liquid level meter.

Taking the liquid level in the evaporation equipment as an example, the tank body has a liquid zone, a gas-liquid mixing zone and a gas zone, and the fluctuation of the liquid level is large. Conventional liquid contact gauges cannot accurately detect the actual liquid level due to large liquid level fluctuations with accompanying foam. However, the ultrasonic, radar, or photoelectric level meter cannot distinguish between a gas-liquid mixing region and a liquid region, and the detected liquid amount is larger than the actual liquid amount. For the liquid in the container with foam and fluctuating liquid level, the liquid level meters in the prior art cannot accurately reflect the liquid level in the tank body.

Disclosure of Invention

In view of the above, the present invention provides a defoaming mechanism, which can eliminate the influence of foam and liquid level fluctuation on a liquid level detection device, so that the liquid level detection device can accurately measure the liquid level.

In one aspect, the invention provides a defoaming mechanism for liquid level detection, comprising a chamber and a blade; the front of the chamber comprises a divergent opening; the blades are arranged at the bottom of the opening; the blade can rotate around the axis of the blade.

Furthermore, the opening of the chamber is trumpet-shaped.

Further, the blade is a helical blade.

On the other hand, the invention also provides a liquid level detection device, which comprises the defoaming mechanism and the liquid level meter; the liquid level meter is arranged at the rear part of the chamber.

Further, the liquid level detection device further comprises a net-shaped piece; the net-shaped piece is arranged at the rear part of the cavity and sleeved outside the liquid level meter.

Further, the bottom of the chamber is provided with a sealing part.

Further, the sealing part is a flange.

Furthermore, the liquid level detection device further comprises a communicating pipeline, one end of the communicating pipeline is communicated with the rear part of the chamber, and a valve is arranged on the communicating pipeline.

Further, the blade is a stainless steel blade or a polypropylene blade.

In a third aspect, the present invention further provides an evaporation apparatus, including the above liquid level detection apparatus, and an evaporation container, wherein a chamber of the liquid level detection apparatus is disposed on a side wall of the evaporation container in a downward inclination manner.

When the defoaming mechanism is used, the defoaming mechanism is arranged in a container in a downward inclined mode, the liquid level meter is placed behind the blades in the chamber, liquid enters from the front part of the chamber, namely the gradually-expanded opening, the liquid impacts the opening, and as the caliber of the opening is gradually reduced from the front end to the bottom, the liquid is extruded by the opening, and the impact force is increased. The blade sets up in the open-ended bottom, and the kinetic energy of liquid impact drives the blade rotation, has consumed the kinetic energy of liquid on the one hand, has reduced the liquid level and has undulant, and the rotation of on the other hand blade can be cut and is eliminated the foam. When the liquid passes through the opening of the chamber and the blade, the interference of foam and liquid level fluctuation is eliminated, and the liquid level can be accurately measured by the liquid level meter arranged behind the blade in the chamber.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural diagram of a first embodiment of a liquid level detection device provided by the invention.

Fig. 2 is a schematic structural diagram of a second embodiment of the liquid level detection device provided by the invention.

Fig. 3 is a schematic structural diagram of a third embodiment of the liquid level detection device provided by the invention.

Fig. 4 is a schematic structural diagram of an embodiment of an evaporation apparatus provided by the present invention.

FIG. 5 is a schematic view of an embodiment of the liquid level detection unit of the present invention for measuring liquid level.

FIG. 6 is a schematic view of another embodiment of the liquid level detection unit of the present invention for measuring liquid level.

Description of reference numerals:

fig. 1 to 4 are numbered as follows:

a chamber 1; an opening 11; a rear portion 12; a sealing member 13; a blade 2; a liquid level meter 3; a mesh 4; a communication pipeline 5; a valve 51; a container 6.

Fig. 5 to 6 are numbered as follows:

a gas zone 100; a gas-liquid mixing zone 200; a liquid zone 300; critical section 400; the liquid level detection device 500.

Detailed Description

The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of a liquid level detection apparatus provided in the present invention. A defoaming mechanism for liquid level detection comprises a chamber 1 and blades 2; the front of the chamber 1 comprises a diverging opening 11; the blade 2 is arranged at the bottom of the opening 11; the blade 2 can rotate around the axis thereof.

The bottom of the opening 11 is an end of the opening 11 having a smaller diameter. The length and diameter of the opening 11 of the chamber 1 are adjusted according to the volume of the container and the liquid level condition. For example, in the case of a large container, the fluctuation of the liquid level is severe, and the length and caliber of the opening 11 should be increased appropriately so that the opening 11 is deep into the inner wall of the container, so that there is a sufficient difference in length and caliber for increasing the liquid impact force.

The blade 2 may be an integrated blade capable of rotating around its own axis, or may be a combined blade formed by combining a plurality of individual blades around an axis, and the rotation of the combined blade around its own axis means the rotation around the axis of the integrated blade.

When the defoaming mechanism is used, the defoaming mechanism is disposed in a container in a downward inclined manner, and a liquid level meter is placed in the chamber 1 at a position behind the blade 2. The liquid enters from the front part of the chamber 1, namely the divergent opening 11, the liquid impacts the opening 11, and the opening 11 gradually reduces in caliber from the front end to the bottom, so that the liquid is pressed by the opening 11, and the impact force is increased. The blade 2 sets up in the bottom of opening 11, and the kinetic energy of liquid impact drives the blade 2 rotation, has consumed the kinetic energy of liquid on the one hand, has reduced the liquid level and has fluctuated, and the foam can be sheared in the rotation of on the other hand blade 2. When the liquid passes through the opening 11 of the chamber 1 and the blade 2, the disturbance of the foam and the level fluctuation is eliminated, and the liquid level can be accurately measured by the liquid level meter 3 arranged in the chamber 1 behind the blade 2.

The defoaming mechanism is simple and convenient to install, disassemble and maintain, does not need to be transformed into the existing equipment in a large quantity, does not need to adopt other expensive detection equipment, only needs to be transformed into the existing equipment in a simple way, can eliminate the interference of foam and liquid level fluctuation, and enables the common liquid level meter to achieve the aim of accurately detecting the liquid level.

Please refer to fig. 1 and fig. 3. Fig. 1 to fig. 3 are schematic structural views of three embodiments of a liquid level detection apparatus according to the present invention. The opening 11 of the chamber 1 is flared.

The trumpet-shaped opening 11 is selected to be different depending on the volume of the container and the liquid level, for example, a straight trumpet-shaped opening as shown in fig. 1, a hyperbolic trumpet-shaped opening as shown in fig. 2, or a parabolic trumpet-shaped opening as shown in fig. 3. Different trumpet-shaped openings can be properly selected according to different liquid surface conditions. For example, under the condition that the volume of the container is large and the liquid level fluctuation is severe, the parabolic horn-shaped opening can be adopted, the impact force of the liquid level can be buffered, and when the impact force is too large, the blade 2 rotates too fast, the rotational flow is too large in the chamber 1, and the liquid level can not be accurately detected by the liquid level meter 3.

Further, in another specific embodiment, the blade 2 is a helical blade. The spiral blade not only can play the effect of shearing defoaming and reducing liquid level fluctuation, but also can enhance the effect of eliminating foam because the spiral blade can rotate to generate rotational flow under the pushing of the liquid impact force, and can bring redundant impurities in the liquid out of the rear part 12 of the chamber 1, so that the rear part 12 of the chamber 1 is not easy to accumulate dirt and block.

A liquid level detection device comprises the defoaming mechanism and a liquid level meter 3; the level gauge 3 described above is arranged in the rear portion 12 of the chamber 1.

The internal diameter and depth of the rear portion 12 of the chamber 1 vary according to the container and the gauge in which it is located. For example, for a large container, the liquid level fluctuates sharply, and when the gas-liquid mixing region is high, the inner diameter and depth of the rear part 12 of the chamber 1 should be increased appropriately so that there is enough room to eliminate the influence of the foam and the fluctuating liquid level on the liquid level measurement.

The gauge 3 described above may be a contact gauge or a non-contact gauge. The contact type liquid level meter refers to a meter for measuring liquid level by contacting liquid, such as a capacitance type liquid level meter, a tuning fork type liquid level meter and the like. The non-contact liquid level meter refers to a meter which indirectly detects the liquid level without directly contacting the liquid, such as an ultrasonic liquid level meter, a radar liquid level meter, an optical fiber liquid level meter and the like. After the influence of foam and liquid level fluctuation on the measurement accuracy is eliminated, the liquid level can be accurately measured by the two liquid level meters. Preferably, the contact type liquid level meter can accurately measure the liquid level condition of a measuring point, and has the advantages of lower cost and more convenient maintenance.

The defoaming mechanism has the technical effects, so that the liquid level detection device with the defoaming mechanism also has the technical effects correspondingly.

Further, in another specific embodiment, the liquid level detection device further comprises a net member 4, wherein the net member 4 is disposed at the rear portion 12 of the chamber 1 and is sleeved outside the liquid level meter 3.

According to the viscosity of the liquid to be detected and the content of impurities in the liquid, the net-shaped pieces with different pore diameters and materials are selected. For example, if the viscosity of the liquid to be tested is high and the content of impurities in the liquid is high, a mesh with relatively large pore size is selected to prevent clogging of the mesh.

The mesh 4 is arranged at the rear part 12 of the chamber 1 and is sleeved outside the liquid level meter 3, so that the liquid passes through the opening 11 and the blade 2 in sequence and then reaches the liquid level meter 3 through the mesh 4. Because net 4 has the mesh, the bubble receives the extrusion of mesh and breaks when liquid passes through net 4, can further strengthen the defoaming effect of whole liquid level detection device. On the other hand, the net-shaped member 4 generates weak resistance to flowing liquid, and can further reduce fluctuation of the liquid level and eliminate interference, so that the liquid level meter 3 can detect the liquid level more accurately.

Further, in a specific embodiment, the bottom of the chamber 1 is provided with a sealing member 13.

Since the liquid level detection device is tilted downward when in use, a space is left in the rear portion 12 of the chamber 1 even if the liquid level rises to a height that can be detected by the liquid level gauge 3. Contain bubble liquid and get into from the opening 11 of cavity 1, partial foam is broken under the effect of blade 2, and when the liquid level of liquid seal cavity 1, the foam is broken the back gas and is remained in cavity 1, and cavity 1's rear portion 12 is seal structure 13, and cavity 1 is inside isolated and form certain malleation with external world this moment, and the malleation in the cavity 1 can further extrude the foam for the foam is more easily broken, and the malleation also is favorable to reducing the undulant of liquid level.

The sealing member 13 is a flange. When the sealing member 13 is a flange, the flange is connected to the chamber 1 by screws, and a flange gasket is used to seal between the flange and the chamber 1. When the liquid level detection device is operated for a long time, impurity and dirt can be accumulated in the chamber 1 and on the net-shaped piece 4 inevitably, the flange is used for dismounting and mounting, and the cleaning and maintenance are convenient.

Further, in another specific embodiment, the liquid level detecting apparatus further includes a communicating pipe 5, one end of the communicating pipe 5 is communicated with the rear portion 12 of the chamber 1, and the communicating pipe is provided with a valve 51.

The rear part 12 of the chamber 1 is provided with a sealing member 13, which forms a closed space with the chamber 1 when the liquid level of the liquid exceeds the opening 11. A small amount of foam breaks out and makes the interior malleation that forms of cavity 1, can further extrude the foam for the foam is changeed and is broken, and the malleation is favorable to reducing the liquid level and fluctuate. However, if the liquid has a large amount of foam, a large amount of gas is collected in the chamber 1 due to the large amount of foam being broken in the chamber 1, and the pressure difference between the gas and the outside is too large, so that the liquid cannot smoothly enter the rear portion 12 of the chamber 1 and is detected by the liquid level meter 3. At this time, the valve 51 is opened, and the gas in the chamber 1 can be rapidly discharged through the communication pipe 5, thereby equalizing the gas pressure between the chamber 1 and the outside. Therefore, the communication line 5 and the valve 51 can adjust the pressure in the chamber 1 and the flow of the liquid. The valve 51 may be a manual valve or an automatic valve. The automatic valve means a device for controlling the valve by some external force, such as a pressure valve, etc., and the valve is opened when the pressure in the chamber 1 is greater than a set value; the valve automatically closes when the pressure in the chamber 1 is less than a set value.

Further, in another specific embodiment, the blade 2 is a stainless steel blade or a polypropylene blade.

The stainless steel blade has good wear resistance, high temperature resistance, corrosion resistance and no toxicity; the polypropylene has high temperature resistance, good chemical stability, impact resistance and no toxicity. The liquid level detection device is often used for measuring the liquid level of high-temperature or corrosive liquid, and a stainless steel blade or a polypropylene blade can better meet the measurement requirements of the special liquid. In addition, certain liquids with higher safety standards, such as fermentation liquor containing food and medicines, require the blade to be nontoxic and not release toxic substances, and the stainless steel blade or the polypropylene blade can better meet the measurement requirements of the liquids.

The blades 2 are arranged on the fixed shaft through a shaft sleeve, and the shaft sleeve is a polytetrafluoroethylene shaft sleeve. The blades 2 are secured to the stationary shaft by bushings, which in this particular embodiment act as sliding bearings, allowing the blades to rotate about the stationary shaft. The polytetrafluoroethylene has the advantages of high temperature resistance, low temperature resistance, corrosion resistance, high lubrication, no toxicity and the like, and particularly has low friction performance. The liquid impacts the blade 2 to make the blade 2 rotate, and because the friction force between the polytetrafluoroethylene shaft sleeve and the fixed shaft is very small, when the liquid level fluctuation is weak, the blade 2 can be easily pushed to rotate by small impact force, so that the effects of eliminating foam and consuming the kinetic energy of the liquid are achieved.

Referring to fig. 4, fig. 4 is a schematic structural diagram of an embodiment of an evaporation apparatus provided in the present invention. In another specific embodiment, the evaporation device comprises the liquid level detection device and the evaporation container 6, wherein the chamber 1 of the liquid level detection device is arranged on the side wall of the evaporation container 6 in a downward inclination mode.

Above-mentioned liquid level detection device has aforementioned beneficial effect, so has above-mentioned liquid level detection device's evaporation plant also to have corresponding beneficial effect. The cavity 1 downward sloping of liquid level detection device sets up on evaporation vessel 6's lateral wall, can play better defoaming and reduce undulant effect, and the accurate liquid level that detects if cavity 1 sets up perpendicularly on the lateral wall, after liquid got into cavity 1's rear portion 12, when the liquid level descends, liquid was difficult for refluxing in evaporation vessel 6, influences the testing result easily. The angle of inclination depends on the viscosity of the liquid in the vaporization container 6 and the fluctuation of the liquid level. For example, when the viscosity of the liquid is high, the liquid impacting the chamber 1 is not easily fallen back, and the inclination angle of the chamber 1 should be appropriately reduced. Also for example, when the liquid level fluctuation is large or the foam is large, the angle at which the chamber 1 is inclined should be appropriately reduced.

Since the liquid level detection means is arranged inclined downward, a space can be left in the rear portion 12 of the chamber 1 even if the liquid level rises to a height that can be detected by the liquid level gauge 3. When the level of the liquid exceeds the opening 11 and the rear part 12 of the chamber 1 is provided with a sealing member 13, the level forms a closed space with the chamber 1. Foam breaks gradually in the liquid, releases the air, forms the malleation in cavity 1 this moment, extrudees the foam, is favorable to further defoaming, and the malleation also helps reducing the liquid level and fluctuates.

FIG. 5 is a schematic view of an embodiment of the liquid level detection unit of the present invention for measuring liquid level. FIG. 6 is a schematic view of another embodiment of the liquid level detection unit of the present invention for measuring liquid level.

Referring to FIG. 5, in one embodiment, the liquid level detection device 500 is used for detecting the liquid level of the fluctuating liquid level containing foam, and the liquid level detection device 500 is located in the gas-liquid mixing zone 200. In this case, the conventional liquid level detection device may indicate that the liquid level is effective under the condition of liquid level fluctuation or foam impact. The liquid level detection device 500 of the present invention eliminates the effects of foam and liquid level fluctuation, and the liquid level gauge indicates that there is no liquid level signal at this time.

Referring to fig. 6, in another embodiment, the liquid level detection device 500 is used for detecting the liquid level of the fluctuating liquid level containing foam, and the liquid level detection device 500 is located in the critical region 400 between the gas-liquid mixing region 200 and the liquid region 300. In the case of large level fluctuation, such as boiling of the liquid in the evaporator, the level fluctuation is severe, and it is very easy for the conventional apparatus to detect no liquid level or to detect a fluctuation high point to cause signal error. The liquid level detection device 500 of the present invention is now effectively detecting the liquid level within the container.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The liquid level detection device is characterized by comprising a defoaming mechanism and a liquid level meter (3); the defoaming mechanism comprises a chamber (1) and blades (2); the front part of the chamber (1) comprises a divergent opening (11); the blades (2) are arranged at the bottom of the opening (11); the blades (2) can rotate around the axes thereof, wherein the defoaming mechanism is arranged in a container in a downward inclined manner when in use; the opening (11) of the chamber (1) is trumpet-shaped; the blade (2) is a spiral blade; the liquid level meter (3) set up in rear portion (12) of cavity (1), rear portion (12) of cavity (1) are equipped with sealing member (13), and wherein, liquid level detection device still includes intercommunication pipeline (5), the one end of intercommunication pipeline (5) with rear portion (12) intercommunication of cavity (1), intercommunication pipeline (5) on be equipped with valve (51).

2. The liquid level detection device according to claim 1, further comprising a mesh (4); the net-shaped piece (4) is arranged at the rear part (12) of the chamber (1) and sleeved outside the liquid level meter (3).

3. A liquid level detection device as claimed in claim 1, characterized in that the sealing member (13) is a flange.

4. The liquid level detection device according to claim 1, wherein the blade (2) is a stainless steel blade or a polypropylene blade.

5. An evaporation device, comprising the liquid level detection device of any one of claims 1 to 4, and an evaporation container (6), wherein the chamber (1) of the liquid level detection device is arranged in the evaporation container in a downward inclination manner

The hair container (6) is arranged on the side wall.