Constant-temperature water bath kettle

Abstract

The utility model provides a constant-temperature water bath kettle which comprises a circulating pump, a water bath kettle body, a water outlet pipeline, a water inlet pipeline and a heating and refrigerating sheet, and is characterized in that the circulating pump is arranged outside the water bath kettle body, the heating and refrigerating sheet is arranged inside the water bath kettle body, a water inlet end of the water inlet pipeline is arranged inside the water bath kettle body, and a water outlet end of the water outlet pipeline is arranged inside the water bath kettle body. The calibration device is used for calibrating the conductivity and the PH value in the calibration of the hemodialysis device detector, and the accuracy and the reliability of a measurement result are ensured; the constant-temperature water bath kettle adopts an external circulating pump and a unique circulating pipeline layout, and the temperature fluctuation is less than + / -0.1 DEG C under the condition that the environment temperature is greater than 25 DEG C; moreover, the whole water bath kettle is simpler in structure, smaller in size, lower in cost and suitable for being integrated with a device.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment calibration, in particular to a semiconductor refrigeration constant temperature water bath used for calibrating a detector of a hemodialysis device. Background Art

[0002] Hemodialysis devices, also known as artificial kidney machines, are medical electrical devices used clinically for blood purification. Using hemodialysis devices for blood purification is a vital survival tool for patients with renal failure. Widely used in major medical institutions, hemodialysis devices' quality and the accuracy of their control parameters directly impact patient treatment outcomes and safety, becoming a hot topic of concern for both physicians and patients. Regular calibration of hemodialysis devices is essential to ensure their proper operation and, indirectly, the safety of patients.

[0003] The hemodialysis device detector is a specialized medical metrology quality control device for testing hemodialysis devices. It is primarily composed of a main unit, conductivity sensor, temperature sensor, flow sensor, and pressure sensor. The working principle of the hemodialysis device detector is to connect the measurement sensors for various parameters to the corresponding pipelines of the hemodialysis device, measure the conductivity, temperature, flow rate, pressure, and other parameters of the liquid in the circuit, and compare the measurement results with the measured values ​​of various parameters in the hemodialysis device monitoring system to calibrate the hemodialysis device. The accuracy of the hemodialysis device detector directly affects the dialysis quality of the hemodialysis device, so the calibration of the hemodialysis device detector is particularly important.

[0004] Conductivity and pH calibration in hemodialysis device detectors must be performed in a constant temperature water bath, maintaining a constant temperature of 25°C with a temperature fluctuation of less than ±0.1°C. Currently, the use of laboratory water baths in hemodialysis device detector calibration has encountered the following main problems:

[0005] (1) The calibration specification requires that the ambient temperature be (10-30)°C and the water bath temperature be constant at 25°C. When the ambient temperature is higher than the water bath temperature, the water absorbs heat from the environment and cannot be kept constant at 25°C.

[0006] (2) Conventional water baths are added to the refrigeration system, which is usually cooled by a compressor. The water baths are large in size and noisy, which is not conducive to integration with other systems such as hemodialysis equipment, testers, and calibration devices.

[0007] (3) The specification requires that the water bath temperature fluctuation be less than ±0.1℃. Generally, the water bath does not have a reasonable water circulation piping system, making it difficult to meet the temperature fluctuation requirements.

[0008] Existing technologies, such as Chinese patent CN201521012443.9, employ a semiconductor refrigeration chip as the cooling element. A separate water bath assembly heats and cools water, which is then pumped into the water bath for circulation. However, this method struggles to meet the temperature control requirements for calibrating hemodialysis instrumentation. Utility Model Content

[0009] The utility model provides a new type of constant temperature water bath, which is used for calibrating the conductivity and pH value of the detector in the hemodialysis device, ensuring the accuracy and reliability of the measurement results. To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0010] A constant temperature water bath comprises a circulation pump, a water bath body, a water outlet pipe, a water inlet pipe, a heating and cooling fin, a heat sink, and a fan. The circulation pump is installed outside the water bath body, the heating and cooling fin is installed inside the water bath body, the water inlet end of the water inlet pipe is inside the water bath body, and the other end is connected to the water inlet of the circulation pump. The water outlet end of the water outlet pipe is inside the water bath body, and the other end is connected to the water outlet of the circulation pump.

[0011] The water bath utilizes an external circulation pump. The inlet end of the water inlet pipe is located near the heating and cooling fins, while the outlet end of the water outlet pipe is located at the center of the water bath. The heating and cooling fins are mounted at the bottom of the water bath. The outlet pipe enters the water bath from the lower side and then extends upward along the inner wall, ultimately ending at the upper center of the water bath. The outlet end of the outlet pipe is equipped with multiple outlets. The inlet end of the water inlet pipe is located toward the end of the thermally conductive convex plate. Multiple heating and cooling fins are required, and the inlet end of the water inlet pipe has a corresponding number of inlets.

[0012] The heating and cooling elements in the water bath utilize semiconductor cooling elements, one end of which is bonded to the heating and cooling elements and the other to the heat sink. A fan is connected to the lower end of the heat sink, activating simultaneously when cooling or heating begins. The heating and cooling elements utilize spaced thermally conductive convex plates for enhanced heating and cooling efficiency. These convex plates are oriented at a 45-degree angle to the sides of the water bath, ensuring optimal water flow and uniform water temperature.

[0013] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0014] The heating and cooling fins of this new system directly contact the water in the water bath, enabling direct temperature transfer. To better regulate the temperature distribution within the water bath, this system utilizes an external circulation pump and a unique circulation piping layout. This allows for temperature fluctuations to be kept to within ±0.1°C even when the ambient temperature is above 25°C. Furthermore, the entire water bath has a simpler structure, is smaller in size, and offers lower costs, making it suitable for integration with other devices.

[0015] In summary, the water bath pot of the utility model realizes fast and accurate temperature control by adopting semiconductor refrigeration technology and the design of an external circulation pump, improves heating and cooling efficiency and water temperature uniformity, and has a simple structure, easy operation, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a three-dimensional diagram of the water bath pot body in the utility model;

[0018] Figure 2 This is a cross-sectional structural diagram of the interior of the water bath body in the utility model;

[0019] Figure 3 This is a top view of the internal structure of the water bath body in the utility model;

[0020] Figure 4 This is a structural diagram of the heating and cooling plate in the utility model;

[0021] Markings in the figure: 1-circulation pump, 2-water bath body, 3-water outlet pipe, 4-water inlet pipe, 5-heating and cooling plate, 51-temperature conduction convex plate, 6-heat sink, 7-fan. DETAILED DESCRIPTION

[0022] Please refer to Figure 1 and Figure 2 A constant temperature water bath comprises a circulating pump 1, a water bath body 2, a water outlet pipe 3, a water inlet pipe 4, a heating and cooling fin 5, a heat sink 6, and a fan 7. The circulating pump 1 is installed outside the water bath body 2, the heating and cooling fin 5 is installed inside the water bath body 2, the water inlet end of the water inlet pipe 4 is inside the water bath body 2, and the other end is connected to the water inlet of the circulating pump 1, the water outlet end of the water outlet pipe 3 is inside the water bath body 2, and the other end is connected to the water outlet of the circulating pump 1.

[0023] Furthermore, the water bath body 2 may be made of a material with good thermal insulation properties.

[0024] Furthermore, the water inlet end of the water inlet pipe 4 is close to the heating refrigeration plate 5. When the water circulates, the refrigerated or heated water can enter the water inlet pipe 4 more quickly, and the temperature of the water in the water bath body 2 can be better controlled by using water circulation.

[0025] Reference Figure 3 Furthermore, the outlet end of the water outlet pipe 3 is arranged at the center of the water bath body 2. The refrigerated or heated water can be more quickly integrated with water of other temperatures, and the temperature of the water in the water bath body 2 can be better controlled.

[0026] Reference Figure 3 Furthermore, the outlet end of the water outlet pipe 3 is provided with multiple outlets. Multiple outlets can better control the temperature of the water in the water bath body 2. The multiple outlets can be scattered in various directions. In one embodiment, two outlets are provided, and in another embodiment, four outlets are provided. This number is also selected to take into account the space required to place other containers such as beakers in the water bath body 2.

[0027] Reference Figure 2 Furthermore, the heating and cooling plate 5 is installed at the bottom of the water bath body 2. This arrangement is mainly to facilitate the installation of other components related to heating and cooling connected to the heating and cooling plate 5.

[0028] Reference Figure 2 、 Figure 3 Furthermore, the water outlet pipe 3 enters from the side of the water bath body 2, close to the lower side, and is then installed upward along the inner wall, with the final water outlet end being placed at the upper center position inside the water bath body 2. Through this installation method, most of the water outlet pipe 3 is installed inside the water bath body 2 and is surrounded by water, so the temperature of the water in the pipe can be better transmitted with the water temperature around the pipe and tends to be stable. If the pipe is mostly arranged outside the water bath body 2 as in the prior art, it is easy to cause heat exchange between the ambient air and the pipe, which is very likely to affect the temperature of the water in the pipe, and at the same time affect the temperature of the water in the water bath body 2, increasing uncontrollable factors. Therefore, the water outlet pipe 3 of the utility model enters from the side of the water bath body 2, close to the lower side, and is then installed upward along the inner wall, with the final water outlet end being placed at the upper center position inside the water bath body 2. This method of pipe arrangement can effectively reduce the influence of external temperature on water temperature.

[0029] See attached Figure 4 Furthermore, the heating and cooling fins 5 are provided with heat transfer convex plates 51 at intervals. Since the heat transfer convex plates 51 are provided at intervals, grooves are formed between the heat transfer convex plates 51, which better expands the heat transfer area of ​​the heating and cooling fins 5, improves the heat transfer efficiency, and provides a guarantee for the temperature control inside the water bath body 2.

[0030] Furthermore, the water bath body 2 can be set to a circular or square structure, which can be determined specifically according to the structure of the device that supports the entire constant temperature water bath. When the water bath body 2 is set to a square structure, the temperature conducting convex plate 51 is set at a 45° angle to the side of the water bath body 2.

[0031] Furthermore, the water inlet end of the water inlet pipe 4 is positioned toward the end of the thermally conductive convex plate. This is because the diagonal distance between the water bath body 2 is relatively large when the water bath body 2 is square. Furthermore, positioning the water inlet end toward the end of the thermally conductive convex plate guides the water flow within the water bath body 2 along the direction of the thermally conductive convex plate 51, increasing the contact time between the water flow and the heating and cooling fins 5 and enabling better control of the water temperature.

[0032] Furthermore, the heating and cooling fins 5 are provided in multiple configurations, and a corresponding number of water inlets are provided at the water inlet end of the water inlet pipe 4. In one embodiment, the heating and cooling fins are provided in multiple configurations, and a corresponding number of water inlets are provided at the water inlet end of the water inlet pipe 4. Multiple heating and cooling fins can be dispersed throughout the bottom of the water bath 2 to better control the water temperature.

[0033] Of course, the constant temperature water bath can be air-cooled, water-cooled, compressor-cooled, etc. An embodiment of the present invention adopts semiconductor refrigeration. Furthermore, the constant temperature water bath also includes a semiconductor refrigeration plate, a heat sink 6, and a fan 7. One side of the semiconductor refrigeration plate is attached to the heating refrigeration plate 5, and the other side is attached to the heat sink 6. The heat sink 6 is installed on the outside of the water bath body 2, and the fan 7 is installed on the heat sink 6.

[0034] Of course, further, the constant temperature water bath also includes a temperature sensor, a water level sensor, a controller, etc. The temperature sensor and the water level sensor are installed inside the water bath body 2, respectively used to detect the water temperature and water level height, and the controller is used to control the entire device. Solenoid valve switches can also be installed on the water outlet pipe 3 and the water inlet pipe 4.

[0035] The water bath integrates a highly efficient heating and cooling system, achieving precise temperature control through the cooperation of an external circulation pump and semiconductor refrigeration chips. Its working process and principle are as follows:

[0036] The controller turns on the semiconductor refrigeration chip and fan 7 simultaneously. Based on the real-time water temperature data detected by the temperature sensor, it decides whether to cool or heat the water inside water bath 2. The controller then turns on circulation pump 1 to circulate the water. Water flows from around the heating refrigeration chip 5 through the water inlet pipe 4, then through the circulation pump 1 and the water outlet pipe 3, to the upper center of water bath 2, accelerating the uniform temperature balance of all water inside water bath 2. The temperature sensor stops the semiconductor refrigeration chip when the water temperature reaches 25°C, but the water circulation continues. Because the temperature sensor can accurately detect water temperature, the semiconductor refrigeration chip is turned on again to adjust the water temperature as required. The semiconductor refrigeration chip can achieve heating or cooling depending on the direction of the current.

Claims

1. A constant temperature water bath, comprising a circulation pump (1), a water bath body (2), a water outlet pipe (3), a water inlet pipe (4), and a heating and cooling plate (5), characterized in that: The circulating pump (1) is installed outside the water bath body (2), the heating and cooling plate (5) is installed inside the water bath body (2), the water inlet end of the water inlet pipe (4) is inside the water bath body (2), and the other end is connected to the water inlet of the circulating pump (1), and the water outlet end of the water outlet pipe (3) is inside the water bath body (2), and the other end is connected to the water outlet of the circulating pump (1); The water inlet end of the water inlet pipe (4) is close to the heating and cooling plate (5), and the water outlet end of the water outlet pipe (3) is arranged at the center position inside the water bath body (2); The heating and cooling plate (5) is installed at the bottom of the water bath body (2); The water outlet pipe (3) enters the interior of the water bath body (2) from the lower side of the water bath body (2), and is then installed upward along the inner wall, with the final water outlet end being located at the upper center position inside the water bath body (2).

2. A constant temperature water bath according to claim 1, characterized in that: The water outlet end of the water outlet pipe (3) is provided with a plurality of water outlets.

3. A constant temperature water bath according to any one of claims 1-2, characterized in that: Temperature conducting convex plates (51) are arranged at intervals on the heating and cooling fins (5).

4. A constant temperature water bath according to claim 3, characterized in that: The water bath body (2) is square, and the temperature conducting convex plate (51) is arranged at an angle of 45° with the side surface of the water bath body (2).

5. A constant temperature water bath according to claim 4, characterized in that: The water inlet end of the water inlet pipe (4) is arranged in the direction of the end of the heat conducting convex plate.

6. A constant temperature water bath according to claim 5, characterized in that: There are multiple heating and cooling plates (5), and a corresponding number of multiple water inlets are provided at the water inlet end of the water inlet pipe (4).

7. A constant temperature water bath according to any one of claims 1-2, 4-6, characterized in that: The invention also includes a semiconductor refrigeration plate, a heat sink (6), a fan (7), a temperature sensor, and a controller. One side of the semiconductor refrigeration plate is bonded to the heating refrigeration plate (5), and the other side is bonded to the heat sink (6). The heat sink (6) is installed on the outside of the water bath body (2). The fan (7) is installed on the heat sink (6). The temperature sensor is installed inside the water bath body (2). The controller is used to control the entire constant temperature water bath.

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