A temperature control device for on-site determination of pH value of water

Abstract

The application discloses a temperature control device for on-site determination of water quality pH value, and belongs to the technical field of pH meter calibration. The temperature control device comprises an outer tank, an inner tank, a flow-through hole, and an impeller. The inner tank forms a fluid channel around itself in the outer tank. The flow-through hole is arranged at the bottom of the inner tank. The impeller drives the liquid in the inner tank to pass through the flow-through hole in a vortex state, and then the liquid is upwardly conveyed in the fluid channel and returns to the inner tank. The support comprises a shaft body and at least two clamping pieces. The shaft body is rotationally connected with the inner tank. The clamping pieces are uniformly distributed along the circumference of the shaft body. The clamping piece comprises four clamping blocks. The pressure difference between the outer side and the inner side of the movable clamping block is generated by the vortex, so that different specifications of solution bottles are clamped. The application realizes self-adaptive clamping of solution bottles of different specifications and weights during constant temperature, and improves the calibration stability and precision of the pH meter.

Description

Technical Field

[0001] The invention belongs to the technical field of pH meter verification, and in particular relates to a temperature control device for on-site determination of the pH value of water quality. Background Art

[0002] The pH value of water quality is a key indicator for assessing the physical and chemical properties, pollution status, and ecological health of water bodies. Its accurate measurement is crucial for environmental monitoring, drinking water safety, and industrial applications. Field measurements typically use the potentiometric method, using a composite electrode to measure the potential difference between a water sample and a standard buffer solution to infer the pH value. The core of this method lies in the electrode's sensitive response to changes in hydrogen ion activity. To ensure reliable measurement results, the instrument must be calibrated using a standard buffer solution before field measurements. Calibration is a critical step in establishing an accurate correspondence between potential difference and pH value. Its accuracy directly determines the validity of the final water sample measurement data and is the cornerstone of the entire measurement process.

[0003] Current on-site pH testing methods face significant challenges when performing calibration, the core of which is the difficulty in controlling ambient temperature. The theoretical value varies with temperature, and the on-site environment is complex and changeable. The temperature of the standard buffer solution carried often deviates from the ideal reference temperature (such as 25°C) and is difficult to stabilize. Because the actual pH value of the buffer solution is highly sensitive to temperature, this deviation will cause its actual value to differ from the theoretical value. As a result, when calibrating with a buffer solution that does not match the temperature, even if the instrument performance is good, the calibration result can easily exceed the normally allowed small error range (such as ±0.05 units). This error is transmitted to the water sample measurement, seriously weakening the accuracy and effectiveness of the on-site data, and becoming a major technical bottleneck for improving the quality of on-site pH measurement.

[0004] Japanese invention patent application number JP2008265897 discloses a constant temperature bath device, which includes an inner water tank, an outer water tank, and a circulation device. A gap is left between the inner and outer water tanks, and the circulation device drives the liquid from the bottom gap to the side gap and flows upward. By optimizing the dual water tank layout and circulation path, combined with the distributed configuration of thermoelectric modules, this device significantly improves the uniformity and efficiency of temperature control. However, in its application in on-site pH measurement, there is still room for technical improvement in the following aspects: after multiple standard buffer solution bottles are placed in the device, they are affected by the circulating water flow and shake and collide with each other, which can easily lead to leakage; the solution bottles are kept static and constant temperature, and their internal concentrations are prone to stratification, affecting the calibration results after constant temperature. Summary of the Invention

[0005] The purpose of the present application is to provide a temperature control device and a clamping mechanism for on-site determination of the pH value of water quality, which have the advantages of adaptively clamping solution bottles of different specifications while improving the temperature control accuracy.

[0006] A temperature control device for measuring the pH value of water quality on-site comprises: an outer tank; an inner tank, a fluid channel surrounding the outer tank; a flow hole provided at the bottom of the inner tank; an impeller, driving liquid in the inner tank downwardly through the flow hole in a vortex state, and then transporting the liquid upward in the fluid channel and back to the inner tank; a bracket, comprising: a shaft, rotatably connected to the inner tank; at least two clamping members evenly distributed along the circumference of the shaft, the clamping members comprising: an annular sleeve connected to the shaft; four clamping blocks evenly distributed along the inner circumference of the annular sleeve, one of the clamping blocks being adjacent to the shaft and fixed to the annular sleeve, and the other three clamping blocks being slidably connected to the annular sleeve and capable of moving toward and away from the fixed clamping block, with spacing between the clamping blocks; the flow holes being evenly distributed along the circumference of the shaft; the vortex creates a pressure difference between the outer and inner sides of the movable clamping blocks, thereby driving the movable clamping blocks to move toward the fixed clamping blocks to clamp solution bottles of different specifications; a sliding sleeve being slidably connected to the shaft along the axial direction, the annular sleeve being fixed to the sliding sleeve, a spring being provided below the sliding sleeve, and the spring elastically supporting the bottom of the sliding sleeve; and a thermal module, for maintaining a constant temperature of the liquid in the fluid channel.

[0007] Preferably, the flow holes at the bottom are long strip-shaped slit holes, which are radially distributed at equal intervals on the bottom of the inner tank. The slit holes penetrate the bottom of the inner tank and the penetration direction is along the tangential direction of the impeller rotation.

[0008] Preferably, the clamp includes: a side portion, which is an arc-shaped sheet, with a spacing between the side portions to allow relative displacement of each side portion; a stop portion, which is provided at the upper and lower ends of the side portion and cooperates with the upper and lower ends of the annular sleeve to limit the sliding direction of the side portion to be perpendicular to the axial direction of the annular sleeve.

[0009] Preferably, the blocking portion extends in a direction away from the axis of the annular sleeve. The blocking portion is an elastic sheet that can restrict the side portion from separating from the annular sleeve. The blocking portion realizes the arrangement of the side portion in the annular sleeve through its own deformation.

[0010] Preferably, the clamping block includes a receiving portion at the bottom, there is a spacing between the receiving portions, the receiving portions extend toward the bottom center of the annular sleeve, adjacent receiving portions cooperate with each other to support the bottom of the solution bottle, and there is a uniform spacing between adjacent receiving portions.

[0011] Preferably, there is a height gap between the bottom of the clamping member and the upper end surface of the bottom of the inner tank.

[0012] Preferably, the shaft body is fixedly connected with a fixing sleeve below the sliding sleeve, and the spring sleeve is provided on the shaft body and located between the fixing sleeve and the sliding sleeve.

[0013] Preferably, the shaft is rotatably connected to the bottom of the inner tank through a bearing, the shaft is detachably connected to the inner tank, and a sealing cover is provided on the outer tank for sealing the tops of the inner tank and the outer tank.

[0014] Preferably, the annular sleeve is a metal mesh, and the upper and lower edges of the metal mesh have annular skeletons.

[0015] Preferably, the thermal module is connected to a control device, the thermal module includes a Peltier element, and the control device performs temperature control by controlling a voltage applied to the Peltier element.

[0016] Compared with the existing technology, the present invention has the following beneficial effects: by driving the movable clamping block with eddy current and adjusting the height of the clamping block with spring, adaptive clamping of "light bottle light clamping, heavy bottle heavy clamping" is realized, solving the problems of cumbersome operation of traditional elastic pre-tightening mechanism, easy crushing of small bottles and easy slipping of large bottles; by adjusting the height of the sliding sleeve by the weight of the bottle, small bottles are matched with low flow rate and large bottles are matched with high flow rate, reducing the temperature deviation of bottles of different specifications; by adopting arc-shaped side parts, limit stops and receiving parts, precise clamping and uniform support of bottles of different diameters are realized, solving the problem of unstable traditional support; the elastic stop design simplifies installation and maintenance, and oscillation during clamping reduces solute agglomeration and bubble adhesion, thereby improving calibration accuracy; equidistant radial slit holes optimize fluid distribution, stabilize laminar flow and improve heat exchange efficiency; Peltier temperature control responds quickly, accurately controls temperature and ensures calibration accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A cross-sectional view of a temperature control device for on-site determination of water pH value;

[0018] Figure 2 A top view of a temperature control device for on-site determination of water pH value with the cover removed;

[0019] Figure 3 Schematic diagram of the flow hole at the bottom of the inner tank;

[0020] Figure 4 Schematic diagram of the bracket structure;

[0021] Figure 5 Schematic diagram of the connection between the sleeve and the spring;

[0022] Figure 6 Schematic diagram of the clamping block structure.

[0023] Reference numerals: outer tank 1; inner tank 2; flow hole 3; impeller 4; bracket 5; shaft 51; annular sleeve 52; clamping block 53; side portion 531; blocking portion 532; receiving portion 533; sliding sleeve 54; spring 55; fixing sleeve 56; thermal module 6; sealing cover 7. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described in detail below with reference to the specific embodiments and the accompanying drawings:

[0025] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] See also Figures 1-5 The present application provides a temperature control device for measuring the pH value of water quality on site, comprising: an outer tank 1; an inner tank 2, forming a fluid channel surrounding the outer tank 1; a flow hole 3, provided at the bottom of the inner tank 2; an impeller 4, driving the liquid in the inner tank 2 downward through the flow hole 3 in a vortex posture, and then transporting the liquid upward in the fluid channel and back to the inner tank 2; a bracket 5, comprising: a shaft 51, rotatably connected to the inner tank 2; at least two clamping members, evenly distributed along the circumference of the shaft 51, the clamping members comprising: an annular sleeve 52, connected to the shaft 51; four clamping blocks 53, evenly distributed along the inner circumference of the annular sleeve 52, one of the clamping blocks 53 being close to the shaft The shaft body 51 is fixed with the annular sleeve 52, and the other three clamping blocks 53 are slidably connected with the annular sleeve 52, and can approach and move away from the fixed clamping block 53. There is a distance between the clamping blocks 53, and the flow holes 3 are evenly distributed along the circumference of the shaft body 51. The eddy current causes a pressure difference between the outside and the inside of the movable clamping block 53 to drive the movable clamping block 53 to move toward the fixed clamping block 53 to clamp solution bottles of different specifications. The shaft body 51 is axially slidably connected with a sliding sleeve 54, and the annular sleeve 52 is fixed to the sliding sleeve 54. A spring 55 is provided under the sliding sleeve 54, and the spring 55 elastically supports the bottom of the sliding sleeve 54; the thermal module 6 is used to maintain a constant temperature of the liquid in the fluid channel.

[0027] The outer tank 1 is the container structure surrounding the inner tank 2. The inner tank 2 is nested within the outer tank 1. It has a flow hole 3 at its bottom and an inlet hole in its upper sidewall, forming a liquid circulation path. The rotation of the impeller 4 causes the liquid in the inner tank 2 to form a downward vortex, which then flows through the bottom flow hole 3 and enters the fluid channel between the outer tank 1 and inner tank 2. As the liquid rises within the channel, it exchanges heat with the thermal module 6 and reaches the inlet hole at the top of the inner tank 2, where it re-enters the inner tank 2, completing the circulation.

[0028] The pressure difference generated by the eddy current acts on the outside of the movable clamp 53 of the clamp, pushing it toward the fixed clamp 53. When solution bottles of different diameters are placed in the clamp, the movable clamp 53 automatically adjusts the clamping position according to the size of the bottle. The circulating liquid continuously flows through the thermal module 6 to achieve a constant temperature, ensuring that the entire solution bottle is in a uniform temperature-controlled environment. It can adapt to reagent bottles of different specifications without the need for additional elastic connection structures and power devices. The circulating temperature control system allows the solution bottle to be completely immersed in the constant temperature liquid, overcoming the temperature gradient problem caused by local heating in traditional equipment.

[0029] During the constant temperature period, the vortex generated by the impeller 4 drives the clamping block 53 to clamp the solution bottles of different specifications, and the buffer is kept at a constant temperature. After the constant temperature is over, the impeller 4 stops rotating, and the vortex gradually dissipates. At this time, the clamping block 53 is automatically released, and the clamping force on the solution bottle is lost, facilitating the removal of the solution bottle. That is, during the process of placing and removing the solution bottle, each clamping block 53 does not exert a clamping force on the side wall of the solution bottle at all times. Compared with the traditional clamping mechanism that uses elastic members to achieve pre-tightening, the present scheme does not need to overcome the pre-tightening force of the elastic members when placing and removing the solution bottle, which is convenient to operate, improves the installation efficiency and the disassembly and removal efficiency, improves the working efficiency of water quality pH determination, and can be applied to field rapid detection by non-professionals. At the same time, the above scheme realizes stable clamping of the solution bottle only during the constant temperature process, avoiding wear and tear of the solution bottle during the process of taking and placing the bottle body.

[0030] Through the above technical scheme, the present application realizes stable fixing and uniform temperature control of the solution bottle. The vortex-driven clamping mechanism automatically adapts to different bottle sizes, ensuring that the position of the reagent bottle is fixed during calibration. The closed circulation system quickly stabilizes the temperature of the buffer, eliminating the influence of temperature deviation on calibration accuracy. The overall structure integrates clamping and temperature control functions in a limited space, significantly improving the accuracy and reliability of on-site pH value determination.

[0031] When the solution bottle is clamped, the annular sleeve 52 drives the sliding sleeve 54 to slide axially along the shaft body 51 and compresses the spring 55 downward. Different specifications of solution bottles load different capacities of buffer: for small bottles, the volume is small, the weight is light, the spring 55 is compressed by a small amount, and the distance between the clamping block 53 and the bottom flow-through hole 3 is large. At this time, when the liquid flows out from the flow-through hole 3 at the bottom of the inner tank 2, it needs to bypass the large distance area below the clamping block 53, and the flow rate is low. Low flow rate reduces the shear friction between the liquid and the clamping block 53 to generate heat, and at the same time, it prolongs the contact time between the liquid and the small bottle, ensuring that the buffer in the small bottle absorbs or releases heat sufficiently, avoiding the overcooling or overheating of the buffer in the small bottle due to the high flow rate;

[0032] For large bottles, the volume is large, the weight is light, the spring 55 is compressed by a large amount, and the distance between the clamping block 53 and the bottom flow-through hole 3 is small. When the liquid flows out from the flow-through hole 3, the flow passage cross-sectional area is small, the flow rate is large, and a turbulent flow is formed. The turbulent flow destroys the laminar flow boundary layer of the liquid, and the convective heat transfer coefficient is improved. Since the large bottle has a large volume and a high heat capacity, it requires more heat or cold to achieve the constant temperature of the buffer loaded inside. The high flow rate of the turbulent flow can quickly transfer heat, shortening the constant temperature time.

[0033] The above scheme automatically adjusts the height of the sliding sleeve 54 by the bottle weight, matches low flow rate for small bottles, and matches high flow rate for large bottles, solving the problems of overcooling or overheating of small bottles due to high flow rate in the traditional fixed structure, and the slow heating or cooling of large bottles due to low flow rate. Ultimately, the temperature deviation of the buffer of all specifications of bottles is reduced.

[0034] The above solution combines adaptive clamping for solution bottles of different sizes. When clamping a small vial, the spring 55 is compressed slightly, and the clamp 53 is farther from the flow hole 3. That is, the clamp 53 is located in the low-speed area above the vortex, where the liquid flow rate is relatively slow. The pressure difference between the outside and inside of the clamp 53 is small, resulting in a small clamping force on the small vial, preventing the glass vial from being crushed by excessive pressure differential. When clamping a large vial, the spring 55 is compressed significantly, and the clamp 53 is closer to the flow hole 3. That is, the clamp 53 is located in the high-speed area above the vortex, where the liquid flow rate is relatively fast. The pressure difference between the outside and inside of the clamp 53 is large, ensuring that the clamp 53 firmly clamps the large vial, preventing it from slipping due to its excessive weight.

[0035] This solution adjusts the height of clamping block 53 by adjusting the compression of spring 55. This height, in turn, affects the eddy current velocity at its location, thereby varying the pressure differential. Furthermore, the compression of spring 55 directly determines its elastic force. These two factors work together to achieve an adaptive clamping effect: "light bottles clamp lightly, heavy bottles clamp hard." This prevents small bottles from being crushed and large bottles from slipping, perfectly matching the clamping requirements of bottles of varying sizes.

[0036] The spring 55 can also achieve elastic buffering, thereby reducing the vibration of the bottle body caused by the liquid flow.

[0037] The flow holes 3 at the bottom are long strip-shaped slit holes, which are radially distributed at equal intervals on the bottom of the inner tank 2 . The slit holes penetrate the bottom of the inner tank 2 and the penetration direction is along the tangential direction of the impeller 4 rotation.

[0038] Specifically, when the impeller 4 drives the liquid to form a vortex, the liquid's trajectory through the bottom slit is limited to flowing tangentially along the impeller 4. The equidistant, radially distributed slits cause the liquid to form multiple, evenly distributed vortex branches during outflow, each forming a symmetrical ascending path within the fluid channel. Because the slits' penetration direction aligns with the impeller 4's rotation direction, kinetic energy loss and flow resistance are reduced during liquid outflow, thereby improving circulation efficiency. This creates a stable laminar flow state in the liquid's circulation path between the inner and outer tanks 1, avoiding temperature fluctuations caused by turbulence.

[0039] By matching the directional slits with the impeller's rotational direction, the liquid flow direction and the driving force direction form a vector superposition, significantly improving kinetic energy transfer efficiency. Compared to traditional annular arrays, the radially distributed slits produce more uniform fluid distribution and eliminate localized dead zones.

[0040] Through the above technical solution, the present application achieves directional control of the liquid circulation path and efficient energy conversion, ensuring that the heat exchange process between the inner and outer tanks 1 has stable laminar flow characteristics. The coordinated design of the slit hole and the rotation direction of the impeller 4 effectively reduces the flow resistance, so that the standard buffer solution maintains a uniform temperature field distribution during the constant temperature circulation process, providing a stable thermal environment for electrode calibration. The radial channel layout further optimizes the distribution of the fluid in the clamping area and improves the adaptive clamping stability by enhancing the pressure effect of the liquid on the clamping block 53.

[0041] See also Figure 6 The clamping block 53 includes a side portion 531 and a stop portion 532. The side portion 531 is an arc-shaped sheet. There is a spacing between the side portions 531 to allow the relative displacement of each side portion 531; the stop portion 532 is provided at the upper and lower ends of the side portion 531, and cooperates with the upper and lower ends of the annular sleeve 52 to limit the sliding direction of the side portion 531 to be perpendicular to the axial direction of the annular sleeve 52.

[0042] The side portion 531 refers to the arc-shaped sheet that constitutes the clamping surface, and the stop portion 532 refers to the limiting structure that constrains the movement direction of the side portion 531. The stop portions 532 at the upper and lower ends form a sliding track to ensure that the side portion 531 only moves in a direction perpendicular to the axis of the sleeve to avoid deflection or axial movement.

[0043] Specifically, when a solution bottle is placed in the clamping area, the three movable side sections 531 are driven toward the fixed side section 531 by the pressure differential generated by the vortex. The spacing between the side sections 531 allows each arc-shaped segment to independently adjust its position according to the bottle diameter, forming an enveloping clamp. The stoppers 532 engage the upper and lower ends of the annular sleeve 52, restricting the side sections 531 to sliding only within a plane perpendicular to the axis of the annular sleeve 52, thus preventing the clamping direction from shifting due to the impact of liquid flow.

[0044] Compared to existing technologies, traditional clamping devices often use elastic structures to adaptively clamp the bottle. This requires overcoming the preload of the elastic member to secure the bottle, making the operation cumbersome, time-consuming, and labor-intensive. This solution utilizes independently slidable curved side portions 531 in conjunction with bidirectional limit stops 532 to achieve adaptive clamping while effectively eliminating clamping angle deviations caused by fluid circulation shock, ensuring the bottle remains vertically stable during constant temperature operation.

[0045] Through the above technical solution, the present application can achieve precise radial clamping of solution bottles of varying diameters, preventing the bottles from tilting or colliding during liquid circulation. The coordination of the retaining portion 532 and the side portion 531 ensures that the clamping direction is always perpendicular to the axis of the annular sleeve 52, ensuring full contact between the bottle and the constant temperature medium, improving temperature control uniformity, and thus ensuring that the standard buffer maintains a stable theoretical pH value during the calibration process.

[0046] The stopper 532 extends away from the axis of the annular sleeve 52 . The stopper 532 is an elastic sheet that can prevent the side portion 531 from separating from the annular sleeve 52 . The stopper 532 achieves the arrangement of the side portion 531 in the annular sleeve 52 by its own deformation.

[0047] When the clamp 53 needs to be installed in the annular sleeve 52, the elastic sheet is manually compressed and deformed, causing the overall size of the clamp 53 to temporarily shrink, so that it can smoothly enter the annular sleeve 52. After the clamp 53 is in place, the elastic sheet returns to its original shape, and its outwardly extending stop 532 forms a limiting structure with the upper and lower ends of the annular sleeve 52 to prevent the clamp 53 from escaping from the annular sleeve 52 under the action of the pressure difference generated by the liquid vortex. In the process of clamping the solution bottle, the elastic sheet allows the clamp 53 to perform a small axial displacement under pressure, realizing a small axial oscillation of the solution bottle in the clamped state. The shear force generated by the oscillation destroys the solute agglomeration in the buffer solution, avoids local concentration gradients, ensures uniform ion distribution, and thus improves the calibration accuracy of the pH meter. At the same time, the oscillation pushes the tiny bubbles in the solution bottle to migrate to the liquid surface and burst, reducing the risk of bubbles adhering to the electrode surface and improving the stability of pH calibration. For buffer solutions containing additives, such as emulsified pH calibration solutions, oscillation can effectively prevent oil-water phase separation and avoid composition mutations caused by the "pipeline effect".

[0048] This solution ensures the adjustable range of the clamping block 53 and avoids the use of additional fasteners through the design of the elastic stop 532, significantly improving the adaptability and reliability of the clamping system. At the same time, it simplifies the installation and maintenance process of the clamping block 53 and improves the efficiency and safety of on-site calibration operations.

[0049] The clamping block 53 includes a receiving portion 533 at the bottom. There is a gap between the receiving portions 533. The receiving portions 533 extend toward the bottom center of the annular sleeve 52. Adjacent receiving portions 533 cooperate with each other to support the bottom of the solution bottle. There is a uniform gap between adjacent receiving portions 533.

[0050] The receiving portion 533 refers to an extended structure provided at the bottom of the clamping block 53, including but not limited to an arc-shaped piece. Its shape matches the contour of the bottom of the solution bottle, which can increase the contact area and improve support stability. Spacing refers to the gap between adjacent receiving portions 533. This can be achieved by adjusting the sliding range of the clamping block 53, allowing the bottoms of solution bottles of different diameters to fit in and form stable contact. Uniform spacing refers to maintaining a consistent separation distance between adjacent receiving portions 533. This can be achieved by providing limit grooves or guide rails to ensure that the multiple receiving portions 533 maintain symmetry during movement.

[0051] Specifically, when the solution bottle is placed in the clamping area, the bottom of the solution bottle first contacts the extended portions of the receiving portions 533. Since the receiving portions 533 extend towards the center of the bottom of the annular sleeve 52 and are uniformly spaced, the adjacent receiving portions 533 automatically adjust the spacing during the sliding of the clamping block 53 to form a support surface matching the size of the bottle bottom. For example, for a solution bottle with a smaller diameter, the movable clamping block 53 drives the receiving portions 533 to move towards the center, reducing the distance between adjacent receiving portions 533; for a solution bottle with a larger diameter, the receiving portions 533 slide outward to expand the spacing. With the cooperation of the receiving portions 533, the bottom of the solution bottle is uniformly supported, avoiding tilting or shaking due to uneven local force.

[0052] Compared with the prior art, the existing clamping device generally uses a fixed-size support structure, which cannot adapt to different specifications of solution bottles, resulting in unstable support of the bottle body during liquid circulation, causing shaking or collision. The present application forms an adaptive support structure through movable receiving portions 533, which can automatically adjust the spacing under different bottle sizes to ensure that the bottle bottom is always uniformly and stably fixed.

[0053] Through the above technical solution, the present application solves the problem of unstable support of the existing constant temperature device due to the inability to adapt to different specifications of solution bottles, effectively reducing the shaking and collision of the bottle body during liquid flow, thereby improving the constant temperature efficiency and calibration accuracy, and ensuring the reliability of the on-site pH value measurement data.

[0054] The bottom of the clamping member is spaced apart from the upper end surface of the bottom of the inner tank 2. The height spacing avoids rigid contact between the bottom of the clamping member and the inner tank 2. During liquid circulation, the vibration energy generated by the solution bottle under the action of the fluid is partially absorbed by the axial floating of the clamping member, reducing the probability of collision between the bottle body and the side wall of the inner tank 2.

[0055] The shaft body 51 is fixedly connected with a fixed sleeve 56 below the sliding sleeve 54, and the spring 55 is sleeved on the shaft body 51 and located between the fixed sleeve 56 and the sliding sleeve 54.

[0056] The shaft body 51 is rotatably connected with the bottom of the inner tank 2 through a bearing, and the shaft body 51 is detachably connected with the inner tank 2. The outer tank 1 is provided with a sealing cover 7 for sealing the top of the inner tank 2 and the outer tank 1.

[0057] Through the above technical solution, the present application solves the problem of insufficient sealing of the traditional device, ensures stable clamping of different specifications of reagent bottles during constant temperature liquid circulation, avoids temperature fluctuations caused by external environmental interference, and improves the accuracy of on-site pH value calibration.

[0058] The annular sleeve 52 is a metal mesh with an annular framework at its upper and lower edges. The mesh's pores allow liquid flow while maintaining structural strength, preventing local collapse due to fluid pressure. Furthermore, liquid in the area of ​​contact between the solution bottle's outer wall and the mesh is continuously exchanged through the mesh, achieving uniform heat transfer. The annular framework further limits edge displacement of the mesh, preventing tearing due to uneven force during clamping. The surface of the mesh can be coated with a corrosion-resistant coating.

[0059] The thermal module 6 is connected to a control device, which includes a Peltier element. The control device controls the voltage applied to the Peltier element to perform temperature control. The thermal module 6 also includes a heat conducting plate and a heat exchanger.

[0060] Peltier element: When electricity is applied, heat is transferred from one side of the metal to the other side;

[0061] Heat conducting plate: evenly conducts heat to the outer tank 11.

[0062] Heat exchanger: It contains a block with flow path and cools down the body through cooling water.

[0063] Thermal module 6 uses a Peltier element as the core temperature control execution unit, which directly realizes the mutual conversion of thermal energy and electrical energy through the thermoelectric effect, can quickly respond to temperature changes, ensure that the standard buffer solution is always at the ideal reference temperature, eliminate calibration errors caused by temperature deviation, and fundamentally guarantee the accuracy of on-site pH value measurement.

[0064] The control device is an electronic control system used to regulate the operating state of the thermal module 6. Specifically, it can be implemented using a microprocessor in conjunction with a temperature sensor, which monitors the fluid temperature in real time and adjusts the voltage output based on feedback. The control device continuously collects temperature data of the liquid in the fluid channel. When it detects that the temperature deviates from the set value, it automatically adjusts the voltage parameters applied to the Peltier element. By changing the voltage amplitude or polarity, the heat generation or heat absorption intensity of the Peltier element is precisely controlled, thereby maintaining a constant temperature state for the liquid in the fluid channel. In this process, the voltage regulation response speed and the temperature fluctuation amplitude form a closed-loop control, allowing solution bottles of different weights or capacities to achieve the appropriate heat exchange efficiency when clamped.

[0065] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A temperature control device for on-site determination of water pH value, characterized in that: include: outer tank (1); An inner tank (2) forms a fluid passage surrounding the inner tank (2) within the outer tank (1); A circulation hole (3) is provided at the bottom of the inner tank (2); An impeller (4) drives the liquid in the inner tank (2) downward through the flow hole (3) in a vortex state, and then transports the liquid upward in the fluid channel and back to the inner tank (2); The bracket (5) comprises: a shaft (51) rotatably connected to the inner tank (2); at least two clamping members evenly distributed along the circumference of the shaft (51), the clamping members comprising: an annular sleeve (52) connected to the shaft (51); four clamping blocks (53) evenly distributed along the inner circumference of the annular sleeve (52), one of the clamping blocks (53) being close to the shaft (51) and fixed to the annular sleeve (52), and the other three clamping blocks (53) being slidably connected to the annular sleeve (52) and capable of approaching and moving away from the fixed clamping block (53), with spacing between the clamping blocks (53). The flow holes (3) are evenly distributed along the circumference of the shaft (51), and the eddy current generates a pressure difference between the outer side and the inner side of the movable clamp (53) to drive the movable clamp (53) to move toward the fixed clamp (53) to clamp solution bottles of different specifications. The shaft (51) is axially slidably connected to a sliding sleeve (54), the annular sleeve (52) is fixed to the sliding sleeve (54), and a spring (55) is provided below the sliding sleeve (54), and the spring (55) elastically supports the bottom of the sliding sleeve (54); The thermal module (6) is used to maintain a constant temperature of the liquid in the fluid channel.

2. The temperature control device for on-site measurement of water pH value according to claim 1, characterized in that: The flow holes (3) at the bottom are long strip-shaped slit holes, and the slit holes are distributed equidistantly and radially at the bottom of the inner tank (2). The slit holes penetrate the bottom of the inner tank (2) and the penetration direction is along the tangential direction of the rotation of the impeller (4).

3. The temperature control device for on-site measurement of water pH value according to claim 1, characterized in that: The clamping block (53) comprises: side portions (531) which are arc-shaped sheets, with spacing between the side portions (531) to allow relative displacement of the side portions (531); and stop portions (532) which are provided at the upper and lower ends of the side portions (531) and cooperate with the upper and lower ends of the annular sleeve (52) to limit the sliding direction of the side portions (531) to be perpendicular to the axial direction of the annular sleeve (52).

4. The temperature control device for on-site measurement of water pH value according to claim 3, characterized in that: The retaining portion (532) extends in a direction away from the axis of the annular sleeve (52). The retaining portion (532) is an elastic sheet that can restrict the side portion (531) from separating from the annular sleeve (52). The retaining portion (532) achieves the arrangement of the side portion (531) in the annular sleeve (52) by its own deformation.

5. The temperature control device for on-site measurement of water pH value according to claim 1, characterized in that: The clamping block (53) includes a receiving portion (533) at the bottom, and there is a spacing between the receiving portions (533). The receiving portions (533) extend toward the bottom center of the annular sleeve (52). Adjacent receiving portions (533) cooperate with each other to support the bottom of the solution bottle, and there is a uniform spacing between adjacent receiving portions (533).

6. The temperature control device for on-site measurement of water pH value according to claim 1, characterized in that: There is a height gap between the bottom of the clamping piece and the upper end surface of the bottom of the inner tank (2).

7. The temperature control device for on-site measurement of water pH value according to claim 1, characterized in that: The shaft body (51) is fixedly connected to a fixed sleeve (56) below the sliding sleeve (54), and the spring (55) is sleeved on the shaft body (51) and located between the fixed sleeve (56) and the sliding sleeve (54).

8. The temperature control device for on-site measurement of water pH value according to claim 1, characterized in that: The shaft (51) is rotatably connected to the bottom of the inner tank (2) via a bearing. The shaft (51) is detachably connected to the inner tank (2). A sealing cover (7) is provided on the outer tank (1) for sealing the tops of the inner tank (2) and the outer tank (1).

9. The temperature control device for on-site measurement of water pH value according to claim 1, characterized in that: The annular sleeve (52) is a metal mesh, and the upper and lower edges of the metal mesh have an annular skeleton.

10. The temperature control device for on-site measurement of water pH value according to claim 1, characterized in that: The thermal module (6) is connected to a control device, the thermal module includes a Peltier element, and the control device performs temperature control by controlling the voltage applied to the Peltier element.

Images