Temperature control device for measuring pH value of water quality on site

Abstract

The invention discloses a temperature control device for measuring the pH value of water on site, and belongs to the technical field of pH meter verification. A fluid channel surrounding the inner tank is formed in the outer tank; the circulation hole is formed in the bottom of the inner tank; the impeller drives the liquid in the inner tank to pass through the circulating hole downwards in a vortex posture, and then the liquid is conveyed upwards in the fluid channel and returns to the inner tank; the bracket comprises a shaft body which is rotationally connected with the inner tank; the at least two clamping pieces are evenly distributed in the circumferential direction of the shaft body, each clamping piece comprises four clamping block vortexes, so that pressure difference is generated between the outer side and the inner side of each movable clamping block, and solution bottles of different specifications are clamped. According to the invention, self-adaptive clamping of solution bottles with different specifications and weights is realized during a constant temperature period, and the calibration stability and precision of the pH meter are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of pH meter calibration, and particularly relates to a temperature control device for on-site measurement of the pH value of water quality. Background Art

[0002] The pH value of water quality is a key indicator for evaluating 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. On-site measurement usually adopts the potentiometric method, which uses a composite electrode to measure the potential difference between a water sample and a standard buffer solution to calculate the pH value. The core of this method lies in the sensitive response of the electrode to changes in hydrogen ion activity. To ensure reliable measurement results, the instrument must be calibrated with a standard buffer solution before on-site measurement. Calibration is a key step in establishing an accurate correspondence between potential difference and pH value, and its accuracy directly determines the validity of the final water sample measurement data and is the cornerstone of the entire measurement process.

[0003] The current on-site pH value detection method faces significant challenges during calibration, with the core difficulty lying in environmental temperature control. The theoretical value varies with temperature, and the on-site environment is complex and changeable. The temperature of the standard buffer solution carried is often deviated from the ideal reference temperature (such as 25°C) and is difficult to stabilize. Since the actual pH value of the buffer solution is highly sensitive to temperature, this deviation will cause its actual value to not match the theoretical value. As a result, when calibrating with a buffer solution with a mismatched temperature, even if the instrument has good performance, the calibration result is extremely likely to exceed the conventional allowable small error range (such as ±0.05 units). This error will be transmitted to the water sample measurement, seriously weakening the accuracy and validity of on-site data and becoming the main technical bottleneck for improving the quality of on-site pH value measurement.

[0004] Japanese Patent No. JP2008265897 discloses a constant temperature bath device, which includes an inner water tank, an outer water tank, and a circulation device. There is a gap between the inner water tank and the outer water tank, and the circulation device drives the liquid to flow upward from the bottom gap to the side gap. By optimizing the double-tank layout and circulation path and combining the distributed configuration of thermoelectric modules, this device significantly improves the uniformity and efficiency of temperature control. However, during its application in on-site pH measurement, there is still room for the following technological improvements: 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 is likely to cause leakage; the solution bottles remain stationary and at a constant temperature, and the concentration inside them is prone to stratification, affecting the calibration result after constant temperature. Summary of the Invention

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

[0006] A temperature control device for on-site measurement of the pH value of water quality, comprising: an outer tank; an inner tank that forms a fluid channel around itself within the outer tank; a circulation hole provided at the bottom of the inner tank; an impeller that drives the liquid in the inner tank to pass downward through the circulation hole in a vortex state, and then conveys the liquid upward in the fluid channel and back to the inner tank; a bracket, comprising: a shaft body rotatably connected to the inner tank; at least two clamping members evenly distributed circumferentially along the shaft body, the clamping members comprising: an annular sleeve connected to the shaft body; four clamping blocks evenly distributed along the inner circumference of the annular sleeve, one of the clamping blocks being close to the shaft body and fixed to the annular sleeve, and the other three clamping blocks being slidably connected to the annular sleeve and capable of approaching and moving away from the fixed clamping block, there being a spacing between the clamping blocks, the circulation holes being evenly distributed circumferentially along the shaft body, and the vortex causing a pressure difference between the outer and inner sides of the movable clamping block to drive the movable clamping block to move towards the fixed clamping block to clamp solution bottles of different specifications, the shaft body being slidably connected axially with a sliding sleeve, the annular sleeve being fixed to the sliding sleeve, and a spring being provided below the sliding sleeve to elastically support the bottom of the sliding sleeve; a heat module for maintaining the temperature of the liquid in the fluid channel constant.

[0007] Preferably, the circulation holes at the bottom are long strip-shaped slit holes, and the slit holes are radially equidistantly distributed at the bottom of the inner tank, and the slit holes penetrate through the bottom of the inner tank and the penetration direction is along the tangent direction of the impeller rotation.

[0008] Preferably, the clamping block comprises: a side part, which is an arc-shaped sheet body, there being a spacing between the side parts to allow relative displacement of each side part; a stop part provided at the upper and lower ends of the side part and cooperating with the upper and lower ends of the annular sleeve for restricting the sliding direction of the side part perpendicular to the axial direction of the annular sleeve.

[0009] Preferably, the stop part extends in a direction away from the axis of the annular sleeve, the stop part is an elastic sheet body capable of restricting the side part from disengaging from the annular sleeve, and the stop part realizes the setting of the side part in the annular sleeve through its own deformation.

[0010] Preferably, the clamping block comprises a receiving part at the bottom, there being a spacing between the receiving parts, the receiving parts extending towards the center of the bottom of the annular sleeve, and adjacent receiving parts cooperating with each other to support the bottom of the solution bottle, and there being a uniform interval between adjacent receiving parts.

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

[0012] Preferably, a fixed sleeve is fixedly connected to the shaft body below the sliding sleeve, and the spring is sleeved on the shaft body and located between the fixed sleeve and the sliding sleeve.

[0013] Preferably, the shaft body is rotatably connected to the bottom of the inner tank through a bearing, the shaft body 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 with 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.

[0016] Compared with the prior art, the present invention has the following beneficial effects: the eddy current is used to drive the movable clamping block and the spring to adjust the height of the clamping block, so as to realize the adaptive clamping of "gently clamping light bottles and firmly clamping heavy bottles", and solve the problems of cumbersome operation of the traditional elastic pre-tightening mechanism, easy crushing of small bottles and easy slipping of large bottles; the height of the sliding sleeve is adjusted by the bottle weight, so that small bottles match low flow rates and large bottles match high flow rates, reducing the temperature deviation of bottles of different specifications; the arc-shaped side part, the limiting blocking part and the receiving part are adopted to realize the precise clamping and uniform support of bottles with different diameters, and solve the problem of unstable traditional support; the design of the elastic blocking part simplifies installation and maintenance, and the oscillation during clamping reduces solute aggregation and bubble attachment, improving the calibration accuracy; the equidistant radially arranged slit holes optimize the fluid distribution, stabilize the laminar flow and improve the heat exchange efficiency; the Peltier temperature control has a fast response, accurately controls the temperature, and ensures the calibration accuracy. Brief Description of the Drawings

[0017] Figure 1 It is a cross-sectional view of a temperature control device for on-site determination of the pH value of water quality; Figure 2 It is a top view of a temperature control device for on-site determination of the pH value of water quality with the cover removed; Figure 3 It is a schematic diagram of the flow hole at the bottom of the inner tank; Figure 4 It is a schematic diagram of the bracket structure; Figure 5 It is a schematic diagram of the connection between the sliding sleeve and the spring; Figure 6 It is a schematic diagram of the clamping block structure.

[0018] Reference numerals in the drawings: outer tank 1; inner tank 2; flow hole 3; impeller 4; bracket 5; shaft body 51; annular sleeve 52; clamping block 53; side part 531; blocking part 532; receiving part 533; sliding sleeve 54; spring 55; fixed sleeve 56; thermal module 6; sealing cover 7. Detailed Description of the Embodiments

[0019] The technical solutions of the present invention will be further described in detail below in combination with the specific embodiments and the drawings: Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] See Figures 1 - 5, this application provides a temperature control device for on-site measurement of water quality pH value, including: an outer tank 1; an inner tank 2 that forms a fluid channel around itself inside the outer tank 1; a circulation hole 3 provided at the bottom of the inner tank 2; an impeller 4 that drives the liquid in the inner tank 2 to pass downward through the circulation hole 3 in a vortex posture, and then conveys the liquid upward in the fluid channel and back to the inner tank 2; a bracket 5, including: a shaft body 51 rotatably connected to the inner tank 2; at least two clamping members evenly distributed circumferentially along the shaft body 51, the clamping members including: an annular sleeve 52 connected to the shaft body 51; four clamping blocks 53 evenly distributed along the inner circumference of the annular sleeve 52, one of the clamping blocks 53 is close to the shaft body 51 and fixed to the annular sleeve 52, and the other three clamping blocks 53 are slidably connected to the annular sleeve 52 and can approach and move away from the fixed clamping block 53, there is a space between the clamping blocks 53, the circulation holes 3 are evenly distributed along the circumference of the shaft body 51, and the vortex causes a pressure difference between the outer side and the inner side of the movable clamping block 53 to drive the movable clamping block 53 to move towards the fixed clamping block 53 to clamp solution bottles of different specifications. The shaft body 51 is slidably connected axially with 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; a heat module 6 for keeping the liquid in the fluid channel at a constant temperature.

[0021] The outer tank 1 refers to the container structure that wraps the inner tank 2. The inner tank 2 refers to the container nested inside the outer tank 1, with a circulation hole 3 opened at its bottom and an inflow hole opened on its upper side wall to form a liquid circulation path. The rotation of the impeller 4 causes the liquid in the inner tank 2 to form a downward vortex, which enters the fluid channel between the outer tank 1 and the inner tank 2 through the bottom circulation hole 3. During the upward movement of the liquid in the channel, it exchanges heat with the heat module 6 and reaches the position of the inflow hole at the upper part of the inner tank 2, and then re-enters the inner tank 2 to form a cycle.

[0022] The pressure difference generated by the vortex acts on the outer side of the movable clamping block 53 of the clamping member, pushing it towards the fixed clamping block 53. When solution bottles of different diameters are placed in the clamping member, the movable clamping block 53 automatically adjusts the clamping position according to the bottle body size. The circulating liquid continuously flows through the heat module 6 to achieve temperature constancy, ensuring that the whole solution bottle is in a uniform temperature control environment, and different specifications of reagent bottles can be adapted without additionally setting an elastic connection structure and a power device. The circulating temperature control system completely immerses the solution bottle in the constant temperature liquid, overcoming the temperature gradient problem caused by local heating of traditional equipment.

[0023] During the constant temperature period, the eddy current generated by the impeller 4 drives the clamping block 53 to clamp solution bottles of different specifications, and the buffer solution is kept at a constant temperature. After the constant temperature ends, the impeller 4 stops rotating and the eddy current gradually dissipates. At this time, the clamping block 53 automatically releases and loses the clamping force on the solution bottle, facilitating the removal of the solution bottle. That is, during the process of placing and removing the solution bottle, there is no clamping force on the side wall of the solution bottle by each clamping block 53. Compared with the traditional clamping mechanism that uses elastic parts to achieve pre-tightening, this solution does not need to overcome the pre-tightening force of the elastic parts when placing and removing the solution bottle, which is convenient for operation, improves the installation efficiency and disassembly efficiency, improves the working efficiency of water quality pH measurement, and can be applied to the rapid field detection by non-professional personnel; at the same time, the above solution realizes stable clamping of the solution bottle only during the constant temperature process, avoiding the wear of the solution bottle body during the process of taking and placing.

[0024] Through the above technical solution, the present application realizes the stable fixation and uniform temperature control of the solution bottle. The eddy current-driven clamping mechanism automatically adapts to different bottle sizes to ensure the fixed position of the reagent bottle during the calibration process. The closed-loop circulation system enables the buffer solution temperature to quickly stabilize and eliminates the influence of temperature deviation on the calibration accuracy. The overall structure integrates the clamping and temperature control functions in a limited space, significantly improving the accuracy and reliability of on-site pH value measurement.

[0025] When the solution bottle is clamped, the annular sleeve 52 drives the sliding sleeve 54 to axially slide along the shaft body 51 and compress the spring 55 downward. Solution bottles of different specifications contain different volumes of buffer solution: for small bottles, their volume is small and their weight is light, the compression amount of the spring 55 is small, and the distance between the clamping block 53 and the bottom flow hole 3 is large. At this time, when the liquid flows out of the flow 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; the low flow rate reduces the shear friction heat generation between the liquid and the clamping block 53, and at the same time prolongs the contact time between the liquid and the small bottle, ensuring that the buffer solution in the small bottle fully absorbs or releases heat and avoiding the overcooling or overheating of the buffer solution in the small bottle caused by too fast a flow rate; For large bottles, their volume is large and their weight is light, the compression amount of the spring 55 is large, and the distance between the clamping block 53 and the bottom flow hole 3 is small. When the liquid flows out of the flow hole 3, the flow channel cross-sectional area is small and the flow rate is large, forming a turbulent flow. The turbulent flow destroys the laminar boundary layer of the liquid, and the convective heat transfer coefficient is increased. Since the large bottle has a large volume and a high heat capacity, that is, the large bottle requires more heat or cold to achieve the constant temperature of the buffer solution loaded inside it. The high-flow turbulent flow can quickly transfer heat and shorten the constant temperature time.

[0026] The above solution automatically adjusts the height of the sliding sleeve 54 according to the bottle weight, matching a low flow rate for small bottles and a high flow rate for large bottles, solving the problems of overheating or overcooling of small bottles due to too high a flow rate and slow heating or cooling of large bottles due to too low a flow rate in the traditional fixed structure, and finally reducing the temperature deviation of the buffer solution in all specification bottles.

[0027] The above solution combines with the adaptive clamping of solution bottles of different specifications. When clamping a small bottle, the compression amount of the spring 55 is small, and the clamping block 53 is far from the flow hole 3, that is, the clamping block 53 is in the low-speed area above the eddy current, the liquid flow rate is relatively slow, and the pressure difference between the outside and the inside of the clamping block 53 is small, so that the clamping force of the clamping block 53 on the body of the small bottle is small, avoiding crushing the glass small bottle due to excessive pressure difference force. When clamping a large bottle, the compression amount of the spring 55 is large, and the clamping block 53 is close to the flow hole 3, that is, the clamping block 53 is in the high-speed area above the eddy current, the liquid flow rate is relatively fast, and the pressure difference between the outside and the inside of the clamping block 53 is large, so that the clamping block 53 tightly clamps the body of the large bottle, preventing it from slipping due to the excessive self-weight of the large bottle.

[0028] The above solution adjusts the height of the clamping block 53 through the compression amount of the spring 55. The height of the clamping block 53 affects the eddy current flow rate at its position, thereby changing the size of the pressure difference. At the same time, the compression amount of the spring 55 directly determines the magnitude of the elastic force of the spring 55. The two work together to achieve the adaptive clamping effect of "lightly clamping light bottles and heavily clamping heavy bottles", which not only avoids crushing small bottles but also prevents large bottles from slipping, perfectly matching the clamping requirements of bottles of different specifications.

[0029] Elastic buffering can also be achieved through the spring 55 to reduce the vibration of the bottle body caused by liquid flow.

[0030] The flow hole 3 at the bottom is a long strip-shaped slit hole. The slit holes are radially distributed equidistantly at the bottom of the inner tank 2, and the slit holes penetrate the bottom of the inner tank 2 and the penetration direction is along the tangent direction of the rotation of the impeller 4.

[0031] Specifically, when the impeller 4 drives the liquid to form an eddy current, the movement trajectory of the liquid passing through the bottom slit holes is limited to flow along the tangent direction of the impeller 4. The equidistantly radially distributed slit holes enable the liquid to form multiple evenly distributed eddy current branches during the outflow process, and each branch forms a symmetric upward path in the fluid channel. Since the penetration direction of the slit holes is consistent with the rotation direction of the impeller 4, the kinetic energy loss of the liquid during outflow is reduced and the flow resistance is decreased, thereby improving the circulation efficiency. This enables the liquid to form a stable laminar flow state in the circulation path between the inner and outer tanks (1), avoiding temperature fluctuations caused by turbulent flow.

[0032] Through the matching design of the directional slit holes and the rotation direction of the impeller 4, the liquid flow direction and the driving force direction form a vector superposition, significantly improving the kinetic energy transfer efficiency. The radially distributed slit hole structure can generate a more uniform fluid distribution compared with the traditional annular array of openings, eliminating local flow dead zones.

[0033] Through the above technical solution, the present application realizes the directional control of the liquid circulation path and the 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 holes and the rotation direction of the impeller 4 effectively reduces the flow resistance, enabling the standard buffer solution to maintain a uniform temperature field distribution during the constant-temperature circulation process, providing a stable thermal environment condition for electrode calibration. The radial channel layout further optimizes the distribution pattern of the fluid in the clamping area, enhancing the adaptive clamping stability by increasing the pressure of the liquid on the clamping block 53.

[0034] See Figure 6 , the clamping block 53 includes a side portion 531 and a blocking portion 532. The side portion 531 is an arc-shaped sheet body, and there is a spacing between the side portions 531 to allow relative displacement of each side portion 531; the blocking 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.

[0035] The side portion 531 refers to the arc-shaped sheet body that constitutes the clamping surface, and the blocking portion 532 refers to the limiting structure that restricts the movement direction of the side portion 531. A sliding track is formed by the blocking portions 532 at the upper and lower ends to ensure that the side portion 531 only moves in a direction perpendicular to the axis of the sleeve, avoiding deflection or axial movement.

[0036] Specifically, when the solution bottle is placed in the clamping area, the three movable side portions 531 move towards the fixed side portion 531 under the driving of the pressure difference generated by the eddy current. The spacing between the side portions 531 allows each arc-shaped sheet body to independently adjust its position according to the diameter of the bottle body, forming a wrapped clamping. The blocking portion 532 cooperates with the upper and lower ends of the annular sleeve 52 to limit the side portion 531 to slide only in a plane perpendicular to the axis of the annular sleeve 52, avoiding the deviation of the clamping direction caused by the impact of liquid flow.

[0037] Compared with the prior art, traditional clamping devices mostly use elastic structures to adaptively clamp the bottle body, and it is necessary to overcome the pre-tightening force of the elastic member to install and clamp the bottle body, which is relatively cumbersome in operation and consumes time and energy. In this solution, the cooperation of the independently slidable arc-shaped side portion 531 and the bidirectional limiting blocking portion 532 effectively eliminates the clamping angle deviation caused by the impact of liquid circulation while realizing adaptive clamping, ensuring that the bottle body remains vertically stable during the constant-temperature process.

[0038] Through the above technical solution, the present application can form precise radial clamping on solution bottles with different diameters, avoiding the inclination or collision of the bottle body during the liquid circulation process. The cooperation of the blocking portion 532 and the side portion 531 makes the clamping direction always perpendicular to the axis of the annular sleeve 52, ensuring full contact between the bottle body and the constant-temperature medium, improving the temperature control uniformity, and thus ensuring the stable theoretical pH value of the standard buffer solution during the calibration process.

[0039] The blocking part 532 extends away from the axis of the annular sleeve 52. The blocking part 532 is an elastic sheet body that can prevent the side part 531 from detaching from the annular sleeve 52. The blocking part 532 enables the side part 531 to be arranged within the annular sleeve 52 through its own deformation.

[0040] When the clamping block 53 needs to be installed onto the annular sleeve 52, the elastic sheet body is manually pressed to deform, temporarily reducing the overall size of the clamping block 53 so that it can smoothly enter the interior of the annular sleeve 52. After the clamping block 53 is in place, the elastic sheet body returns to its original state, and its outwardly extending blocking part 532 forms a limiting structure with the upper and lower ends of the annular sleeve 52, preventing the clamping block 53 from detaching from the annular sleeve 52 under the pressure difference generated by the liquid vortex. During the process of clamping the solution bottle, the elastic sheet body allows the clamping block 53 to undergo a small axial displacement under pressure drive, achieving a small axial oscillation of the solution bottle in the clamped state. The shear force generated by the oscillation breaks the agglomeration of solutes in the buffer solution, avoids local concentration gradients, ensures uniform ion distribution, thereby improving the calibration accuracy of the pH meter. At the same time, the oscillation pushes the tiny bubbles in the solution bottle towards the liquid surface and causes them to burst, reducing the risk of bubbles adhering to the electrode surface and enhancing the pH calibration stability. For buffer solutions containing additives, such as emulsified pH calibration solutions, the oscillation can effectively prevent the separation of the oil and water phases and avoid component mutations caused by the "pipe effect".

[0041] Through the design of the elastic blocking part 532, this solution not only ensures the adjustable range of the clamping block 53 but also avoids the use of additional fasteners, significantly enhancing the adaptive capacity 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.

[0042] The clamping block 53 includes a receiving part 533 at the bottom. There is a gap between the receiving parts 533. The receiving parts 533 extend towards the center of the bottom of the annular sleeve 52. Adjacent receiving parts 533 cooperate with each other to support the bottom of the solution bottle, and there is a uniform interval between adjacent receiving parts 533. ]

[0043] The receiving part 533 refers to an extended structure provided at the bottom of the clamping block 53, including but not limited to an arc-shaped sheet, whose shape matches the contour of the bottom of the solution bottle, and can increase the contact area to enhance the support stability. The gap refers to the space between adjacent receiving parts 533, which can be specifically adjusted by the sliding range of the clamping block 53, allowing the bottoms of solution bottles with different diameters to be inserted and form stable contact. Among them, the uniform interval means that the separation distance between adjacent receiving parts 533 remains consistent, which can be specifically achieved by setting limiting grooves or guiding tracks to ensure the symmetry of multiple receiving parts 533 during movement.

[0044] Specifically, when the solution bottle is placed in the clamping area, its bottom first contacts the extended part of the receiving portion 533. Since the receiving portion 533 extends towards the center of the bottom of the annular sleeve 52 and there are uniform intervals, the adjacent receiving portions 533 automatically adjust the spacing during the sliding process of the clamping block 53, forming a support surface that matches the size of the bottle bottom. For example, for a solution bottle with a smaller diameter, the movable clamping block 53 drives the receiving portion 533 to move towards the center, reducing the distance between adjacent receiving portions 533; for a solution bottle with a larger diameter, the receiving portion 533 slides outwards to increase the spacing. Through the cooperation of the receiving portion 533, the bottom of the solution bottle is evenly supported, avoiding tilting or shaking caused by uneven local stress.

[0045] Compared with the prior art, the existing clamping devices usually adopt a support structure with a fixed size and cannot adapt to solution bottles of different specifications, resulting in the bottle body swinging or colliding due to unstable support during liquid circulation. This solution forms an adaptive support structure through the movable receiving portion 533, which can automatically adjust the spacing under different bottle body sizes to ensure that the bottle bottom is always fixed evenly and stably.

[0046] Through the above technical solutions, this application solves the problem of unstable support caused by the inability of the existing constant temperature device to adapt to solution bottles of different specifications, effectively reducing the swinging and collision of the bottle body during liquid flow, thereby improving the constant temperature efficiency and calibration accuracy, and ensuring the reliability of on-site pH value measurement data.

[0047] There is a height interval between the bottom of the clamping member and the upper end surface of the bottom of the inner tank 2. The height interval prevents rigid contact between the bottom of the clamping member and the inner tank 2. During the liquid circulation process, part of the vibration energy generated by the solution bottle under the action of the fluid is absorbed through 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.

[0048] A fixed sleeve 56 is fixedly connected below the sliding sleeve 54 on the shaft body 51, and the spring 55 is sleeved on the shaft body 51 and is located between the fixed sleeve 56 and the sliding sleeve 54.

[0049] The shaft body 51 is rotatably connected to the bottom of the inner tank 2 through a bearing. The shaft body 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.

[0050] Through the above technical solutions, this application solves the problems of the traditional device being unable to quickly maintain the bracket 5 assembly and insufficient sealing, ensuring that reagent bottles of different specifications are stably clamped during the constant temperature liquid circulation process, avoiding temperature fluctuations caused by external environmental interference, and thus improving the accuracy of on-site pH value calibration.

[0051] The annular sleeve 52 is a metal mesh, and the upper and lower edges of the metal mesh have annular skeletons. The pores of the metal mesh allow the liquid to flow but can maintain the structural strength, and it will not cause local collapse due to fluid pressure. At the same time, the liquid in the contact area between the outer wall of the solution bottle and the metal mesh can be continuously exchanged through the mesh holes to achieve uniform heat transfer. The annular skeleton further restricts the edge displacement of the metal mesh to avoid tearing of the metal mesh due to uneven force during the clamping process. The surface of the metal mesh can be covered with a corrosion-resistant coating.

[0052] The thermal module 6 is connected to a control device. The thermal module 6 includes a Peltier element, and the control device performs temperature control by controlling the voltage applied to the Peltier element. The thermal module 6 also includes a heat conducting plate and a heat exchanger.

[0053] Peltier element: After being energized, heat transfers from one side of the metal to the other side; Heat conducting plate: Uniformly conducts heat to the outer tank 11.

[0054] Heat exchanger: It includes a block body with a flow path and is cooled by cooling water.

[0055] The 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, can ensure that the standard buffer solution is always at the ideal reference temperature, eliminate the calibration error caused by temperature deviation, and fundamentally guarantee the accuracy of on-site pH value measurement.

[0056] The control device refers to an electronic control system used to adjust the working state of the thermal module 6. Specifically, it can be realized by a microprocessor cooperating with a temperature sensor, by continuously monitoring the fluid temperature and feedback-adjusting the voltage output. The control device continuously collects the 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 both ends of the Peltier element. By changing the voltage amplitude or polarity, it precisely controls the heat generation or heat absorption intensity of the Peltier element, and then maintains the constant temperature state of the liquid in the fluid channel. In this process, the response speed of voltage regulation and the amplitude of temperature fluctuation form a closed-loop control, so that solution bottles of different weights or volumes can obtain an appropriate heat exchange efficiency in the clamped state.

[0057] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A temperature control device for on-site measurement of the pH value of water quality, characterized in that, Comprising: An outer tank (1); An inner tank (2) that forms a fluid channel around itself within the outer tank (1); A circulation hole (3) provided at the bottom of the inner tank (2); An impeller (4) that drives the liquid in the inner tank (2) to pass downward through the circulation hole (3) in a swirling motion, and then conveys the liquid upward in the fluid channel and back to the inner tank (2); A bracket (5), including: a shaft body (51) rotatably connected to the inner tank (2); at least two clamping members evenly distributed circumferentially along the shaft body (51), the clamping members including: an annular sleeve (52) connected to the shaft body (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 body (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 a spacing between the clamping blocks (53), The circulation holes (3) are evenly distributed along the circumferential direction of the shaft body (51), and the swirling flow causes a pressure difference between the outer and inner sides of the movable clamping block (53) to drive the movable clamping block (53) to move towards the fixed clamping block (53) to clamp solution bottles of different specifications. A sliding sleeve (54) is slidably connected to the shaft body (51) along the axial direction, 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); A heat module (6) for maintaining a constant temperature of the liquid in the fluid channel.

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

3. The temperature control device for on-site measurement of water quality pH value according to claim 1, characterized in that: The clamping block (53) includes: a side portion (531), which is an arc-shaped sheet body, with a spacing between the side portions (531) to allow relative displacement of each side portion (531); a blocking portion (532) provided at the upper and lower ends of the side portion (531) and cooperating with the upper and lower ends of the annular sleeve (52) to limit the sliding direction of the side portion (531) perpendicular to the axial direction of the annular sleeve (52).

4. A temperature control device for on-site measurement of water quality pH value according to claim 3, characterized in that: The blocking portion (532) extends in a direction away from the axis of the annular sleeve (52), the blocking portion (532) is an elastic sheet body, capable of restricting the side portion (531) from disengaging from the annular sleeve (52), and the blocking portion (532) realizes the setting of the side portion (531) within the annular sleeve (52) through its own deformation.

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

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

7. The temperature control device for on-site measurement of water quality pH value according to claim 1, characterized in that: 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).

8. A temperature control device for on-site measurement of water quality pH value according to claim 1, characterized in that: The shaft body (51) is rotatably connected to the bottom of the inner tank (2) through a bearing. The shaft body (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 quality 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 annular skeletons.

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

Images