A film strip-based humidity sensor and a stirring device thereof

Abstract

The application provides a film strip type humidity sensor and a stirring device thereof, which comprises a shell, a fixing plate, a film strip hanging rod, a water absorbing film strip, a displacement detection module and a main control module arranged in the shell, and a through hole is formed in the shell and communicates the inside and outside of the shell, the film strip hanging rod and the displacement detection module are arranged on the panel of the fixing plate facing the through hole, the film strip hanging rod comprises a first hanging rod and a second hanging rod, the first hanging rod is arranged above the second hanging rod, the water absorbing film strip passes the first hanging rod and the second hanging rod from top to bottom, the displacement detection module is close to the water absorbing film strip and is used for detecting the length variable X of the water absorbing film strip, the main control module is electrically connected with the displacement detection module and is used for calculating the humidity value φ corresponding to the length variable X of the water absorbing film strip; during work, the water absorbing film strip emits or absorbs water vapor through the through hole and is shortened or lengthened, the displacement detection module detects the length variable X of the water absorbing film strip, and the main control module calculates the humidity value φ corresponding to the length variable X.

Description

Technical Field

[0001] This application relates to the field of sensors, and more specifically, to a membrane-based humidity sensor and its stirring device. Background Technology

[0002] Currently, degassing and mixing technology is becoming increasingly mature in the field of dual-center mixing equipment. Dual-center mixing equipment is commonly used in the research and development of high-performance materials, as well as for mixing, degassing, and grinding different materials. During the mixing and degassing process, the humidity within the mixing chamber affects the quality of the materials, and different materials require different humidity levels. Existing dual-center mixing equipment urgently needs a method that can monitor and control the ambient humidity within the mixing chamber in real time to meet the different mixing environment requirements of various materials. Summary of the Invention

[0003] To address the shortcomings of existing technologies, in a first aspect, this application provides a membrane-based humidity sensor, comprising a housing and a fixing plate, membrane hanging rods, a water-absorbing membrane, a displacement detection module, and a main control module disposed within the housing. The housing has a through hole connecting the inside and outside of the housing. The fixing plate has the membrane hanging rods and the displacement detection module disposed on its panel facing the through hole. The membrane hanging rods include a first hanging rod and a second hanging rod, with adjacent first hanging rods positioned on top of the second hanging rods. The water-absorbing membrane passes over the first and second hanging rods from top to bottom. The displacement detection module is located near the water-absorbing membrane to detect the length variable X of the water-absorbing membrane. The main control module is electrically connected to the displacement detection module and is used to calculate the humidity value φ corresponding to the length variable X of the water-absorbing membrane. During operation, the water-absorbing membrane shortens or lengthens due to the release or absorption of water vapor through the through hole. The displacement detection module detects the length variable X of the water-absorbing membrane, and the main control module calculates the humidity value φ corresponding to the length variable X.

[0004] Preferably, the functional relationship between the length variable X and the humidity value φ is: φ = 40%rh ± k*X, where k is the humidity coefficient.

[0005] Preferably, the line connecting the first hanging rod and the second hanging rod is inclined to the horizontal plane.

[0006] Preferably, the membrane strip hanging rod includes a plurality of first hanging rods and a plurality of second hanging rods, and the plurality of first hanging rods and second hanging rods are arranged at equal intervals in the height direction or the horizontal direction.

[0007] Preferably, the housing has a plurality of through holes, which are elongated through holes, and the front projection of the through holes is separate from the front projection of the absorbent membrane strip in the front projection direction.

[0008] Preferably, the distance between any two adjacent first and second hanging rods is equal, and the second hanging rod is at the same height as the through hole.

[0009] Preferably, the absorbent membrane is made of absorbent resin and water-soluble polymer compound, and the ratio of the absorbent resin component to the water-soluble polymer compound component is 0.8-1:1.

[0010] Preferably, the absorbent membrane tape is further made of a crosslinking agent and a plasticizer, wherein the ratio of the crosslinking agent to the plasticizer is 1:2-4.

[0011] Preferably, it also includes a membrane belt adjusting wheel and an adjusting handwheel. The membrane belt adjusting wheel is disposed on the fixed plate. One end of the absorbent membrane belt is connected to the first hanging rod, and the other end of the absorbent membrane belt is wound around the membrane belt adjusting wheel. The membrane belt adjusting wheel is used to tighten the absorbent membrane belt. The adjusting handwheel is geared to the membrane belt adjusting wheel and protrudes outside the housing.

[0012] Secondly, this application provides a stirring device, which includes a stirring chamber, a main control board, a drying module, and a membrane-based humidity sensor as described above. The main control board is electrically connected to the humidity sensor and the drying module. The humidity sensor and the drying module are installed in the stirring chamber. The humidity sensor is used to detect the humidity value in the stirring chamber, and the drying module is used to dry the stirring chamber to reduce the humidity value. The main control board controls the drying module to perform drying based on the humidity value obtained by the humidity sensor.

[0013] This application provides a humidity sensor based on a membrane strip and its mixing device. The water-absorbing membrane strip on the humidity sensor can emit or absorb water vapor, causing its length to shorten or lengthen. The displacement detection module can detect the length variable X of the water-absorbing membrane strip, and the main control module can calculate the humidity value φ corresponding to the length variable X. The mixing device can adjust the mixing process according to the humidity value φ. The humidity sensor and mixing device provided in this application have the advantages of real-time monitoring of humidity values, and are accurate and fast.

[0014] Other features and advantages disclosed in this application will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the above-described technology disclosed in this application.

[0015] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A front view of a membrane-based humidity sensor provided in an embodiment of this application;

[0018] Figure 2 A cross-sectional view of a membrane-based humidity sensor provided in an embodiment of this application;

[0019] Figure 3 A diagram showing the shortening of the absorbent membrane strip provided in the embodiments of this application;

[0020] Figure 4 This is a diagram showing the elongation of the absorbent membrane strip provided in an embodiment of this application.

[0021] Figure 5 This is a schematic diagram of the structure of the stirring device provided in the embodiment of this application. Detailed Implementation

[0022] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0023] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Please refer to Figures 1 to 5This application provides a membrane-based humidity sensor 1, which includes a housing 2 and a fixing plate 3, membrane strip hanging rods 4, absorbent membrane strips 5, displacement detection module 6, and main control module 7 disposed within the housing 2. The housing 2 has a through hole 21 connecting the inside and outside of the housing 2. Water vapor outside the housing 2 can enter the housing 2 through the through hole 21, and similarly, water vapor inside the housing 2 can also flow out of the housing 2 through the through hole 21. The fixing plate 3 has the membrane strip hanging rods 4 and the displacement detection module 6 disposed on its panel facing the through hole 21. The displacement detection module 6 can be a displacement sensor. The membrane strip hanging rods 4 include a first hanging rod 41 and a second hanging rod 42. Two adjacent first hanging rods 41 are disposed on top of the second hanging rods 42, meaning that in the same group of membrane strip hanging rods 4, the height of the first hanging rod 41 is higher than the height of the second hanging rod 42. The absorbent membrane strip 5 wraps around the first hanging rod 41 and the second hanging rod 42 from top to bottom, adhering tightly to both rods. The absorbent membrane strip 5 is elastic and stretchable. A displacement detection module 6 is positioned near the absorbent membrane strip 5 to detect its length variable X. The main control module 7 is electrically connected to the displacement detection module 6 and is used to calculate the humidity value φ corresponding to the length variable X of the absorbent membrane strip 5. During operation, the absorbent membrane belt 5 is in a dynamic equilibrium state, meaning its weight equals the tension force, and it is in a static, taut state. The absorbent membrane belt 5 releases or absorbs moisture through the through-holes 21, causing its weight to decrease or increase. When the absorbent membrane belt 5 releases moisture and its weight decreases, its weight becomes less than the tension force, resulting in a shortening of its length. When the absorbent membrane belt 5 absorbs moisture and its weight increases, its weight becomes greater than the tension force, resulting in an elongation of its length. The displacement detection module 6 detects the length variable X of the absorbent membrane belt 5, and the main control module 7 calculates the humidity value φ corresponding to the length variable X. It should be noted that the length variable X represents the amount of shortening or elongation of the absorbent membrane belt 5, that is, the difference between the length of the absorbent membrane belt 5 after the change and its original length.

[0025] Specifically, the relative humidity of the humidity sensor 1 provided in this application embodiment can be 40%rh. This relative humidity of 40%rh can be a standard value. The linear function relationship between the length variable X and the humidity value φ is: φ = 40%rh ± k*X, where k is the humidity coefficient and the value range of k can be 1-10. The length variable X can be a sum, that is, the sum of the shortening or elongation of the absorbent membrane belt 5 between adjacent first hanging rods 41 and second hanging rods 42. The total number of first hanging rods 41 and second hanging rods 42 is N. There are N-1 changes between adjacent first hanging rods 41 and second hanging rods 42. The sum of N-1 changes is represented as the length variable X.

[0026] Please refer to Figure 3When the actual ambient humidity is less than 40%rh relative humidity, the absorbent membrane 5 will release water vapor, which will reduce the weight of the absorbent membrane 5. Since the height of the first hanging rod 41 is higher than that of the second hanging rod 42, the shortening direction of the absorbent membrane 5 is upward toward the higher first hanging rod 41. The function relationship between its length variable X and the humidity value φ is: φ = 40%rh - k*X.

[0027] Please refer to Figure 4 When the actual ambient humidity is greater than 40%rh relative humidity, the absorbent membrane 5 will absorb water vapor, which will increase the weight of the absorbent membrane 5. Since the height of the first hanging rod 41 is higher than that of the second hanging rod 42, the extension direction of the absorbent membrane 5 is downward and towards the lower height of the second hanging rod 42. The function relationship between its length variable X and the humidity value φ is: φ = 40%rh + k*X.

[0028] Please refer to Figure 2 To increase the contact area between the absorbent membrane strip 5 and water vapor, and to increase the number of humidity samples collected, thereby improving the accuracy and objectivity of humidity detection by the humidity sensor 1, the membrane strip hanging rod 4 includes multiple first hanging rods 41 and second hanging rods 42. The line connecting the first hanging rods 41 and the second hanging rods 42 is inclined to the horizontal plane, meaning that the absorbent membrane strip 5 can form multiple "W"-shaped connections by continuously connecting the multiple first hanging rods 41 and the second hanging rods 42. The multiple first hanging rods 41 and the second hanging rods 42 are equidistantly spaced in the height direction. This equidistant spacing makes the temperature detection more objective and realistic, avoiding abrupt changes in values ​​at any point. In other embodiments, the humidity sensor 1 can also be placed horizontally, with the multiple first hanging rods 41 and the second hanging rods 42 equidistantly spaced in the horizontal direction, continuously connected to form multiple "W"-shaped connections.

[0029] Please refer to Figure 2 In a preferred embodiment, the housing 2 has multiple through holes 21, which are elongated and projected in the front direction, and the front projection of the through holes 21 is opposite to the front projection of the absorbent membrane 5. The distance between adjacent first hanging rods 41 and second hanging rods 42 is equal, and the second hanging rods 42 are at the same height as the through holes 21. When water vapor enters or exits through the through holes 21 on the housing 2, similar to a louvered temperature measuring box, the water vapor can contact the absorbent membrane 5 at the midpoint between the first hanging rods 41 and the second hanging rods 42, allowing the humidity sensor 1 to detect humidity more objectively and accurately.

[0030] In a typical embodiment, to enhance the water vapor adsorption capacity of the absorbent membrane 5, the absorbent membrane 5 can be made of superabsorbent polymer (SAP) and a water-soluble polymer. SAP is a novel functional polymer material with a high water absorption capacity, capable of absorbing hundreds to thousands of times its own weight in water, and exhibits excellent water retention properties. Once it absorbs water and swells into a hydrogel, it is difficult to separate the water even under pressure. The water-soluble polymer is a strongly hydrophilic polymer material that can dissolve or swell in water to form an aqueous solution or dispersion system. The ratio of the superabsorbent polymer to the water-soluble polymer is 0.8-1:1.

[0031] In a preferred embodiment, the absorbent membrane 5 further comprises a cross-linking agent and a plasticizer. The cross-linking agent generates chemical bonds between linear molecules, linking them together to form a network structure, thus improving the strength and elasticity of the absorbent membrane 5. The use of a plasticizer improves the performance of the absorbent membrane 5 by weakening the secondary valence bonds between resin molecules, increasing the mobility of resin molecular bonds, reducing the crystallinity of resin molecules, increasing the plasticity of resin molecules, enhancing their flexibility, and making them easier to process. The ratio of the cross-linking agent to the plasticizer is 1:2-4.

[0032] In this embodiment, the absorbent membrane 5 can be made of 40% absorbent resin, 40% water-soluble polymer compound, 5% crosslinking agent and 15% plasticizer.

[0033] Please refer to Figure 1 It also includes a membrane belt adjusting wheel (not shown in the figure) and an adjusting handwheel 8, with the membrane belt adjusting wheel mounted on the fixed plate 3. One end of the absorbent membrane belt 5 is connected to the first hanging rod 41, and the other end of the absorbent membrane belt 5 is wound around the membrane belt adjusting wheel. The membrane belt adjusting wheel is used to tighten the absorbent membrane belt 5, and the adjusting handwheel 8 is connected to the gear of the membrane belt adjusting wheel, with the adjusting handwheel 8 protruding outside the housing 2. The tension of the absorbent membrane belt 5 can be adjusted by rotating the adjusting handwheel 8, which in turn rotates the membrane belt adjusting wheel. In general implementation, when initializing the use of the humidity sensor 1, the absorbent membrane belt 5 needs to be adjusted to a naturally taut state, neither shortening nor lengthening.

[0034] In a typical embodiment, the displacement detection module 6 can be a displacement sensor, which can be one of the following: a photoelectric displacement sensor, a magnetic displacement sensor, or a digital laser displacement sensor. The displacement detection module 6 can mark a detection point A on the closest absorbent membrane strip 5, and determine the change in length of the absorbent membrane strip 5 by detecting the displacement of this detection point A.

[0035] In a typical embodiment, a display module 9 is also included. The main control module 7 is electrically connected to the display module 9, and the display module 9 is used to display the humidity value φ.

[0036] Please refer to Figure 5 Secondly, this application provides a stirring device 10, which includes a stirring chamber (not shown in the figure), a main control board 11, a drying module 12, and a membrane-based humidity sensor 1 as described above. The main control board 11 is electrically connected to the humidity sensor 1 and the drying module 12, which are installed inside the stirring chamber. The humidity sensor 1 is used to detect the humidity value inside the stirring chamber, and the drying module 12 is used to dry the stirring chamber to reduce the humidity value. The drying module 12 can be a dryer or a heater. The main control board 11 controls the drying module 12 to perform the drying operation based on the humidity value obtained by the humidity sensor 1.

[0037] In a typical embodiment, the mixing device 10 can be a dual-center mixing device 10. When using the dual-center mixing device 10, the required humidity for the mixing materials can be set on the main control board 11, and the humidity sensor 1 can be activated for real-time monitoring. If the real-time humidity is lower than the set humidity, the mixing device 10 continues to mix the materials; if the real-time humidity is higher than the set humidity, the mixing device 10 can activate the drying module 12 to dry the materials until the real-time humidity reaches the set humidity. By detecting and controlling the humidity within the mixing device 10, the required humidity for mixing different materials can be met, thereby obtaining higher quality composite materials.

[0038] This application provides a humidity sensor 1 based on a membrane strip and its stirring device 10. The water-absorbing membrane strip 5 on the humidity sensor 1 can emit or absorb water vapor, causing its length to shorten or lengthen. The displacement detection module 6 can detect the length variable X of the water-absorbing membrane strip 5, and the main control module 7 can calculate the humidity value φ corresponding to the length variable X. The stirring device 10 can adjust the stirring process according to the humidity value φ. The humidity sensor 1 and its stirring device 10 provided in this application have the advantages of real-time monitoring of humidity values, and are accurate and fast.

[0039] In the several embodiments provided in this application, it should be understood that the functional modules in each embodiment can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0040] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0041] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A humidity sensor based on a membrane strip, characterized in that, The device includes a housing and a fixing plate, a membrane strip hanging rod, a water-absorbing membrane strip, a displacement detection module, and a main control module disposed within the housing. The housing has a through hole connecting the inside and outside of the housing. The fixing plate has the membrane strip hanging rod and the displacement detection module disposed on its panel facing the through hole. The membrane strip hanging rod includes a first hanging rod and a second hanging rod, with each pair of adjacent first hanging rods positioned above the second hanging rod. The water-absorbing membrane strip passes over the first and second hanging rods from top to bottom. The displacement detection module is located near the water-absorbing membrane strip to detect the length variable X of the water-absorbing membrane strip. The main control module is electrically connected to the displacement detection module and is used to calculate the humidity value φ corresponding to the length variable X of the water-absorbing membrane strip. The functional relationship between the length variable X and the humidity value φ is: φ = 40%rh ± k*X, where k is the humidity coefficient. During operation, the water-absorbing membrane strip shortens or lengthens due to the release or absorption of water vapor through the through hole. The displacement detection module detects the length variable X of the water-absorbing membrane strip, and the main control module calculates the humidity value φ corresponding to the length variable X.

2. A humidity sensor based on a membrane strip as described in claim 1, characterized in that, The line connecting the first hanging rod and the second hanging rod is inclined to the horizontal plane.

3. A humidity sensor based on a membrane strip according to claim 2, characterized in that, The membrane strip hanging rod includes multiple first hanging rods and multiple second hanging rods, which are equidistantly spaced in the height direction or the horizontal direction.

4. A humidity sensor based on a membrane strip as described in claim 1, characterized in that, The shell has multiple through holes, which are elongated through holes. In the front projection direction, the front projection of the through hole is separate from the front projection of the absorbent membrane strip.

5. A membrane-based humidity sensor according to claim 1 or 4, characterized in that, The first and second hanging rods, which are adjacent to each other, are spaced at the same distance, and the second hanging rod is at the same height as the through hole.

6. A humidity sensor based on a membrane strip according to claim 1, characterized in that, The absorbent membrane is made of absorbent resin and water-soluble polymer compound, and the ratio of the absorbent resin component to the water-soluble polymer compound component is 0.8-1:

1.

7. A humidity sensor based on a membrane strip according to claim 6, characterized in that, The absorbent membrane also includes a crosslinking agent and a plasticizer, wherein the ratio of the crosslinking agent to the plasticizer is 1:2-4.

8. A humidity sensor based on a membrane strip according to claim 1, characterized in that, It also includes a membrane belt adjusting wheel and an adjusting handwheel. The membrane belt adjusting wheel is disposed on the fixed plate. One end of the absorbent membrane belt is connected to the first hanging rod, and the other end of the absorbent membrane belt is wound around the membrane belt adjusting wheel. The membrane belt adjusting wheel is used to tighten the absorbent membrane belt. The adjusting handwheel is geared to the membrane belt adjusting wheel and protrudes outside the housing.

9. A mixing device, characterized in that, The device includes a stirring chamber, a main control board, a drying module, and a membrane-based humidity sensor as described in any one of claims 1 to 8. The main control board is electrically connected to the humidity sensor and the drying module. The humidity sensor and the drying module are installed inside the stirring chamber. The humidity sensor is used to detect the humidity value inside the stirring chamber. The drying module is used to dry the stirring chamber to reduce the humidity value. The main control board controls the drying module to perform drying based on the humidity value obtained by the humidity sensor.

Images