Corrosion-resistant liquid density detector
By using displacement sensors of magnets and magnetic inductive components and corrosion-resistant materials in the liquid density detection device, the problem of vulnerability of density meter and leakage risks in chemical production is solved, efficient and safe liquid density detection is achieved, and maintenance costs are reduced .
Patent Information
- Application Number
- CN202420261465.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-02
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-02-02
AI Technical Summary
The existing liquid density detection devices are prone to damage to corrosive materials in chemical production, resulting in frequent replacement of density meters, high maintenance costs, and risk of leakage during hazardous liquid detection, which violates safety laws and regulations.
A corrosion-resistant liquid density detector is designed, using a displacement sensor combined with magnet and magnetic inductive elements. The measurement float is made of corrosion-resistant materials, and a corrosion-resistant coating is installed on the measuring rod to calculate the density through magnetic field changes to reduce the The mechanical structure is exposed to a corrosive environment, combining quantitative introduction components and remote communication modules to achieve accurate density detection in a closed environment.
It improves the corrosion resistance and reliability of the detector, reduces maintenance costs, avoids the frequent replacement of density meter due to corrosion damage, and safely and efficiently conducts liquid density detection in a closed environment.
Smart Images
Figure CN222144783U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a liquid detection instrument for a rapid bus station, in particular to a corrosion-resistant liquid density detector. Background Art
[0002] In the process of chemical production, it is usually necessary to react chemical products through multiple processing steps. In order to understand the current reaction progress, it is usually necessary to detect the density of chemical products. Since chemical reactions are mostly processed inside the reaction device, the inside of the reaction device is usually a closed environment. The traditional measurement method requires the material inside the reactor to be taken out before measurement. During the measurement, the measurement sample is taken and loaded into the measuring tube, put into the density meter, and the density value of the floating position is read. However, this measurement method is prone to leakage when used for density detection of dangerous liquid chemical products, which is highly dangerous and does not meet the requirements of safety laws and regulations for automated control of key hazardous chemical process safety production processes. Therefore, a device that can directly check the product density in a closed environment on a chemical product production equipment and prevent leakage is needed. In the prior art, Chinese patent CN214749564U discloses an online liquid density monitoring device, which includes a feed pipe, a measuring pipe, a discharge pipe and a density meter; one end of the feed pipe is connected to the production device and the other end is connected to the measuring pipe, and a density meter for detecting liquid density is set in the measuring pipe; one end of the discharge pipe is connected to the measuring pipe and the other end is connected to the production device. The device can directly take samples through the feed pipe under closed conditions, perform density detection through a density meter, and then put the sample after density detection back into the production device through a discharge pipe.
[0003] However, when the device is used in a production unit producing corrosive products such as di(trichloromethyl) carbonate, the density meter will be frequently replaced due to corrosion damage, and the price of this type of equipment is generally more than 30,000 yuan. Frequent replacement of the density meter will result in excessively high maintenance costs.
[0004] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the invention
[0005] The utility model aims to provide a corrosion-resistant liquid density detector to address the deficiencies of the prior art.
[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0007] A corrosion-resistant liquid density detector comprises a feed pipe, a measuring pipe, a discharge pipe and a densitometer; one end of the feed pipe is used to introduce materials, and the other end is connected to the measuring pipe to introduce materials into the measuring pipe; the densitometer is arranged in the measuring pipe for detecting material density; one end of the discharge pipe is connected to the measuring pipe to discharge materials in the measuring pipe, and the other end is used to export materials; a quantitative introduction component is also included, which is used to introduce a fixed volume of material into the measuring pipe; the densitometer comprises a measuring float with a magnet arranged inside, a measuring rod with a magnetic induction element arranged at the lower end inside, and a processor electrically connected to the magnetic induction element; the measuring rod is vertically fixed in the measuring pipe, and the measuring float is slidably mounted on the measuring rod and floats on the introduced material; the magnetic induction element is combined with the magnet to form a displacement sensor, and the processor obtains the displacement change of the displacement sensor and converts the displacement into material density information; a corrosion-resistant coating is arranged on the outer wall of the measuring rod, and the measuring float is made of corrosion-resistant material.
[0008] Furthermore, it also includes a display electrically connected to the processor for displaying the material density value.
[0009] Furthermore, the magnetic sensing element is a tunnel magnetoresistive chip or a Hall chip.
[0010] Furthermore, the quantitative introduction component includes a liquid level sensor, a first flow control valve and a second flow control valve; the liquid level sensor is arranged in the measuring tube to detect the liquid level of the material in the measuring tube; the first flow control valve is arranged on the feed pipe, and the second flow control valve is arranged on the discharge pipe; the volume of the material entering the measuring tube is controlled by the first flow control valve, and the volume of the material discharged from the measuring tube is controlled by the second flow control valve, and then the volume of the material introduced into the measuring tube is accurately controlled by the liquid level sensor, the first flow control valve and the second flow control valve.
[0011] Furthermore, the quantitative introduction component includes a first control valve and a second control valve; the outer wall of the measuring tube has a vertical transparent structure to facilitate observation of the liquid level in the measuring tube, and the transparent structure is engraved with a standard line for reference to the material liquid level; the first control valve can control the conduction or closing of the feed pipe; the second control valve is used to control the conduction or closing of the discharge pipe.
[0012] Furthermore, the outer wall of the measuring rod is coated with polytetrafluoroethylene material.
[0013] Furthermore, the measuring float is a double-layer hollow tube made of polytetrafluoroethylene.
[0014] Furthermore, it also includes a remote communication module, and the remote communication module is connected to the controller. The utility model has substantial characteristics and progress compared with the prior art. Specifically, the utility model has the following advantages:
[0015] 1. Materials of different densities exert different buoyancy on the measuring float, causing the floating height of the measuring float to be different, which in turn causes the magnetic field of the magnet to change relative to the magnetic sensing element. The magnetic sensing element detects the change and converts the change into a voltage signal and transmits it to the processor. The processor measures the displacement distance of the float with the voltage signal and converts the displacement distance into a density signal of the material. The density of the material is calculated by using the principle of the float densitometer and combining the change of the magnetic field. This solution measures the density of the material by changing the magnetic field and reduces the direct use of mechanical structures to measure the density of the material. Compared with the existing technology, it avoids exposing too many mechanical structures of the device to corrosive materials, reduces corrosive mechanical damage, and improves reliability and durability.
[0016] 2. A corrosion-resistant material is provided on the measuring rod and the measuring float is made of a corrosion-resistant material, which improves the corrosion resistance and durability of the density meter, reduces the equipment maintenance cost, and avoids the problem in the prior art that the density meter is exposed to a corrosive environment and reduces its service life, thereby leading to a high equipment maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural schematic diagram of Example 1 of the corrosion-resistant liquid density detector of the utility model.
[0018] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.
[0019] In the figure:
[0020] 11. Feed pipe; 12. Measuring pipe; 13. Discharge pipe; 14. Standard line;
[0021] 21. Measuring rod; 22. Measuring float; 23. Magnet; 24. Display; 25. Production equipment; 26. Magnetic sensing element. DETAILED DESCRIPTION
[0022] The following is a specific implementation method, combined with Figure 1 to Figure 2 , the technical solution of the utility model is further described in detail.
[0023] Embodiment 1:
[0024] A corrosion-resistant liquid density detector comprises a feed pipe 11, a measuring pipe 12, a discharge pipe 13 and a densitometer; one end of the feed pipe 11 is connected to a material production equipment 25 for introducing the material, and the other end is connected to the measuring pipe 12 for introducing the material in the production equipment 25 into the measuring pipe 12; the densitometer is arranged in the measuring pipe 12 for detecting the density of the material; one end of the discharge pipe 13 is connected to the measuring pipe 12 for discharging the material in the measuring pipe 12, and the other end is connected to the material production equipment 25 for guiding the material discharged from the measuring pipe 12 back to the production equipment 25.
[0025] The density meter includes a measuring rod 21 and a measuring float 22. The measuring rod 21 is vertically fixed in the measuring tube 12, and the measuring float 22 is slidably sleeved on the measuring rod 21. The density of the material is detected according to the buoyancy applied by the material to the measuring float 22.
[0026] The outer wall of the measuring rod 21 is provided with a corrosion-resistant coating, and the measuring float 22 is made of a corrosion-resistant material. Specifically, the outer wall of the measuring rod 21 is coated with polytetrafluoroethylene material; the measuring float 22 is a double-layer hollow structure tube body and is made of polytetrafluoroethylene.
[0027] In detail, the corrosion-resistant liquid density detector of this embodiment can be installed in the production equipment 25 for producing bis(trichloromethyl) carbonate; the corrosion-resistant liquid density detector of this embodiment is used to detect the density of bis(trichloromethyl) carbonate, and then judge the progress of its chemical reaction.
[0028] The corrosion-resistant liquid density detector further comprises a quantitative introduction component, which comprises a liquid level sensor, a first flow control valve and a second flow control valve. Specifically, the liquid level sensor is a photoelectric liquid level sensor.
[0029] The liquid level sensor is arranged in the measuring tube 12 to detect the liquid level of the material in the measuring tube 12; the first flow control valve is arranged on the feed pipe 11, and the second flow control valve is arranged on the discharge pipe 13; the volume of the material entering the measuring tube 12 is controlled by the first flow control valve, and the volume of the material discharged from the measuring tube 12 is controlled by the second flow control valve; when it is necessary to introduce material into the measuring tube 12, the first flow control valve is opened, and the material in the production equipment 25 enters the measuring tube 12 from the feed pipe 11. After the material height reaches the liquid level sensor, the first flow control valve is closed. When the volume of the material in the measuring tube 12 is too much, the second flow control valve is opened to discharge the excess material, and then the volume of the material is stabilized at the required fixed value. The volume of the material introduced into the measuring tube 12 is accurately controlled by the liquid level sensor, the first flow control valve, and the second flow control valve.
[0030] In detail, the volume of the material introduced into the measuring tube 12 each time is a fixed value. After the material is added to the measuring tube 12 to a fixed volume, the density of the measuring float 22 is the same as the ideal density of the material. The density of the material when it does not contain other chemical components of different densities is the ideal density. When the material to be measured is of ideal density, the buoyancy of the material on the measuring float 22 is the standard buoyancy, and the height of the measuring float 22 relative to the bottom of the measuring tube 12 is the standard height. When the material to be measured contains light substances with a density less than the ideal density, the buoyancy of the material on the measuring float 22 is less than the standard buoyancy, and the height of the measuring float 22 is less than the standard height. When the material to be measured contains heavy substances with a density greater than the material, the buoyancy of the material on the measuring float 22 is greater than the standard buoyancy, and the height of the measuring float 22 is greater than the standard height. The density of the material is determined based on the difference between the measuring float 22 and the standard height; based on the detected material density, the chemical reaction process of the material in the production equipment 25 is further determined.
[0031] Furthermore, the measuring rod 21 is a hollow rod body and the rod body is provided with a magnetic sensing element 26 .
[0032] A magnet 23 is disposed in the measuring float 22 . The magnet 23 is a permanent magnet in an annular structure. The magnet 23 is disposed in the double-layer hollow structure of the measuring float 22 .
[0033] The corrosion-resistant liquid density detector further includes a processor electrically connected to the magnetic sensing element 26 and a display 24 electrically connected to the processor.
[0034] During use, the material drives the measuring float 22 to float. When the material carries substances of different densities, the floating heights of the measuring float 22 and the magnet 23 are different, and the magnetic field of the magnet 23 changes relative to the magnetic sensing element 26. The magnetic sensing element 26 detects the change in the magnetic field and converts the change into a voltage signal and transmits it to the processor; the relative change in the magnetic field of the magnet 23 is directly proportional to the floating height of the magnet 23 and the measuring float 22 relative to the liquid surface, and the floating height of the magnet 23 and the measuring float 22 relative to the liquid surface is inversely proportional to the density of the material; the processor converts the received voltage signal into the density information of the material and transmits it to the display 24 for display, and judges the chemical reaction process of the material according to the density information of the material. The algorithm for the processor to process the voltage signal into the corresponding distance information and density information is a prior art and will not be repeated here.
[0035] Specifically, an analog-to-digital conversion chip is integrated in the processor, and the analog-to-digital conversion chip may be an ADS1220 chip.
[0036] In other embodiments, the processor can also transmit the information to a control system such as a DCS or a PLC via 4-20 mA analog or digital communication (modbus485), and then determine the degree of chemical reaction of the material according to the different densities of the material.
[0037] Furthermore, the magnetic sensing element 26 is a tunnel magnetoresistance (TMR) chip, which senses the change in the magnetic field of the magnet 23 through the tunnel magnetoresistance chip of the magnetic sensing element 26, and converts the change into a voltage signal to be transmitted to the analog-to-digital conversion chip. Specifically, the tunnel magnetoresistance chip can be a TMR130X series chip of Jiangsu Multidimensional Technology Co., Ltd.
[0038] Embodiment 2:
[0039] The difference between this embodiment and the first embodiment is that in this embodiment, an ultrasonic distance meter is used to detect the displacement of the measuring float 22. The ultrasonic distance meter is electrically connected to the controller and transmits the detection result to the controller.
[0040] Embodiment 3:
[0041] The difference between this embodiment and the first embodiment is that, in this embodiment, the outer wall of the measuring rod 21 is coated with a corrosion-resistant special enamel material or a carbon fiber material.
[0042] Embodiment 4:
[0043] The difference between this embodiment and embodiment 1 is that in this embodiment, the magnetic sensing element 26 is a Hall chip. Depending on the actual application site of the project, the Hall chip can adopt the low-voltage power supply DH621, DH627, DH251 and other models of Wuxi Disi Technology Co., Ltd., or the high-voltage power supply DH452 model chip of Wuxi Disi Technology Co., Ltd.
[0044] Embodiment 5:
[0045] The difference between this embodiment and embodiment 1 is that, in this embodiment, the corrosion-resistant liquid density detector further includes a remote communication module, and the remote communication module is connected to the controller.
[0046] Embodiment 6:
[0047] The difference between this embodiment and embodiment 1 is that the quantitative introduction component includes a first control valve and a second control valve; the outer wall of the measuring tube 12 has a vertical transparent structure to facilitate observation of the liquid level in the measuring tube 12, and a standard line 14 for reference to the material liquid level is engraved on the transparent structure, through which the height of the material liquid level in the measuring tube 12 can be observed; the first control valve can control the conduction or closing of the feed pipe 11; the second control valve is used to control the conduction or closing of the discharge pipe. During use, the first control valve is opened and the second control valve is closed, so that the material in the production equipment 25 enters the measuring tube 12 from the feed pipe 11; the operator closes the first control valve after observing that the material liquid level reaches the vicinity of the standard line 14. When the material liquid level is higher than the standard line 14, the second control valve is opened to discharge the material from the discharge pipe 13 to the measuring tube 12, and when the material liquid level reaches the standard line 14, the second control valve is closed.
[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.
Claims
1. A corrosion-resistant liquid density detector, characterized in that: It includes a feed pipe, a measuring pipe, a discharge pipe and a densitometer; one end of the feed pipe is used to introduce materials, and the other end is connected to the measuring pipe to introduce materials into the measuring pipe; the densitometer is arranged in the measuring pipe to detect the density of the materials; one end of the discharge pipe is connected to the measuring pipe to discharge the materials in the measuring pipe, and the other end is used to export the materials; it also includes a quantitative introduction component, which is used to introduce a fixed volume of materials into the measuring pipe; The density meter comprises a measuring float with a magnet inside, a measuring rod with a magnetic induction element at the lower end inside, and a processor electrically connected to the magnetic induction element; the measuring rod is vertically fixed in the measuring tube, and the measuring float is slidably mounted on the measuring rod and floats on the introduced material; The magnetic sensing element is combined with the magnet to form a displacement sensor, and the processor obtains the displacement change of the displacement sensor and converts the displacement into material density information; The outer wall of the measuring rod is provided with a corrosion-resistant coating, and the measuring float is made of a corrosion-resistant material.
2. The corrosion-resistant liquid density detector according to claim 1, characterized in that: It also includes a display electrically connected to the processor for displaying the material density value.
3. The corrosion-resistant liquid density detector according to claim 1, characterized in that: The magnetic sensing element is a tunnel magnetoresistive chip or a Hall chip.
4. The corrosion-resistant liquid density detector according to claim 1, characterized in that: The quantitative introduction component includes a liquid level sensor, a first flow control valve and a second flow control valve; The liquid level sensor is arranged in the measuring tube to detect the liquid level height of the material in the measuring tube; the first flow control valve is arranged on the feed pipe, and the second flow control valve is arranged on the discharge pipe; the volume of the material entering the measuring tube is controlled by the first flow control valve, and the volume of the material discharged from the measuring tube is controlled by the second flow control valve, and then the volume of the material introduced into the measuring tube is accurately controlled by the liquid level sensor, the first flow control valve and the second flow control valve.
5. The corrosion-resistant liquid density detector according to claim 1, characterized in that: The quantitative introduction component includes a first control valve and a second control valve; the outer wall of the measuring tube has a vertical transparent structure to facilitate observation of the liquid level in the measuring tube, and a standard line for reference to the material liquid level is engraved on the transparent structure; the first control valve can control the conduction or closing of the feed pipe; the second control valve is used to control the conduction or closing of the discharge pipe.
6. The corrosion-resistant liquid density detector according to any one of claims 1 to 5, characterized in that: The outer wall of the measuring rod is coated with polytetrafluoroethylene material.
7. The corrosion-resistant liquid density detector according to claim 4, characterized in that: The measuring float is a double-layer hollow tube made of polytetrafluoroethylene.
8. The corrosion-resistant liquid density detector according to claim 4, characterized in that: It also includes a remote communication module, which is connected to the controller.