Wireless pressure recorder calibration device

Abstract

The utility model relates to the technical field of equipment calibration, in particular to a wireless pressure recorder calibration device, which is characterized in that a constant-temperature tank is hermetically arranged, and the distance between a temperature measuring end inserted into an inner cavity of the constant-temperature tank and a measured wireless pressure recorder is not more than 15mm, so that the accuracy of the measured environment temperature is ensured; a temperature controller, a heating unit and a standard thermometer are further arranged in an inner cavity of a constant-temperature tank, the heating unit and the standard thermometer are connected with the temperature controller, and the temperature controller regulates and controls the heating unit according to the temperature measurement value of the standard thermometer to reach the preset temperature; a plurality of heating units are uniformly distributed, so that the temperature of the inner cavity is uniform; the distance of the pressure guiding pipe is set to be 1.2 m at least, it is ensured that the temperature of gas entering the constant-temperature tank is not affected by heat of the constant-temperature tank, the pressure relief valve is arranged to control the air pressure, the accuracy of the temperature and the air pressure value in the constant-temperature tank is ensured, and therefore the consistency of the calibration environment and the actual working environment of the tested wireless pressure recorder is ensured, and the calibration accuracy of the wireless pressure recorder is improved. And the accuracy and effectiveness of the calibration value of the wireless pressure recorder are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of equipment calibration, in particular to a wireless pressure recorder calibration device. Background Art

[0002] The most common use scenario of wireless pressure recorders is for the calibration of high-pressure steam sterilizers. The sterilization process is a typical high-temperature and high-pressure process, and the wireless pressure recorder works in a composite field of temperature and pressure.

[0003] Wireless pressure recorders do not have conventional pressure interfaces because their use environment is different from that of conventional pressure measuring instruments. At present, the calibration of wireless pressure recorders is mainly carried out at room temperature. The recorder is placed in a sealed container, pressure is applied to the container, and calibration is performed by data comparison. However, there is a large difference between the current calibration environment and the ambient temperature of the equipment, and the impact of ambient temperature on the measurement results of pressure equipment cannot be ignored.

[0004] Moreover, at present, the traceability of the measurement value of wireless pressure recorders in China is still carried out in a single field. The temperature measurement traceability part mainly follows the "Temperature Data Acquisition Instrument Calibration Specification" stipulated by the industry, and uses a standard platinum resistance thermometer with a constant temperature bath to carry out calibration work. The pressure part is generally traced according to the "Digital Pressure Gauge Verification Procedure" stipulated by the industry, and the wireless pressure recorder is used as a simple digital pressure controller and supporting devices. This traceability method has serious defects, that is, the calibration environment is not consistent with the actual use environment of the equipment. Temperature and pressure are two thermal parameters that interact and influence each other. The calibrated wireless pressure recorder is used to calibrate the temperature and pressure composite field in the sterilizer cavity. The calibration of a single temperature or pressure will ignore the drift of the wireless pressure recorder caused by the use environment under the composite field. Utility Model Content

[0005] The utility model discloses a wireless pressure recorder calibration device, aiming to solve the technical problems existing in the prior art.

[0006] The utility model adopts the following technical solutions:

[0007] A wireless pressure recorder calibration device comprises a sealed thermostatic tank, a standard thermometer installed in the inner chamber of the thermostatic tank, a temperature controller, a plurality of evenly distributed heating units, and a pressure control unit installed outside the thermostatic tank and connected to the thermostatic tank; wherein the temperature controller is respectively connected to the standard thermometer and the heating unit; the plurality of evenly distributed heating units are respectively placed on the bottom plane and the side wall of the inner chamber of the thermostatic tank according to preset requirements;

[0008] The wireless pressure recorder is placed on the bottom plane, and the distance h from the temperature measuring end of the standard thermometer to the wireless pressure recorder should satisfy: h≤15mm.

[0009] In some embodiments, the thermostatic tank includes a main body made of stainless steel and a cover made of stainless steel that are detachably connected, and a sealing device is provided between the main body and the cover.

[0010] In some embodiments, the external threaded interface provided at the upper end of the main body is screwed and connected with the internal threaded interface provided at the lower end of the cover body, the sealing device includes a sealing ring and a groove for placing the sealing ring, and the sealing device is provided with at least two sets in parallel.

[0011] In some embodiments, the temperature controller includes a main unit and a display screen that are fixedly connected together. The main unit with a built-in PID controller is located in the inner chamber, the display screen is embedded on the side wall of the thermostatic tank body, and the display screen panel is located on the outer surface of the side wall of the body.

[0012] In some embodiments, the display screen includes an upper display screen and a lower display screen, the upper display screen is configured as a touch screen for setting the target temperature, and the lower display screen is configured to display the actual temperature in the constant temperature tank in real time.

[0013] In some embodiments, the heating unit includes heating wires evenly distributed on the bottom plane and the side walls, and at least evenly distributed on the side walls at 1 / 3 and 2 / 3 of the distance from the bottom plane.

[0014] In some embodiments, the pressure control unit includes a standard pressure source, a pressure pipe is provided between the standard pressure source and the constant temperature tank, the pressure pipe is configured as a soft high-pressure air pipe, is connected to the constant temperature tank, and a pressure relief valve is provided on the pressure pipe, so that the air pressure entering the constant temperature tank is a preset air pressure.

[0015] In some embodiments, the distance L between the thermostatic tank and the standard pressure source should satisfy: L≥1.2m, so that the temperature of the gas entering the thermostatic tank does not exceed 50°C.

[0016] In some embodiments, the temperature measuring end of the standard thermometer is inserted into the inner chamber of the thermostatic tank through a central channel provided on the cover body, and the standard thermometer is in a vertically suspended state, and a sealant is provided between the standard thermometer and the central channel.

[0017] In some embodiments, at least one calibrated wireless pressure recorder is placed in the inner chamber of the constant temperature tank. Beneficial Effects

[0018] The utility model discloses a wireless pressure recorder calibration device. Compared with the prior art, the utility model has the following advantages:

[0019] A wireless pressure recorder calibration device is provided with a thermostatic tank in a sealed manner, a standard thermometer is inserted in the inner chamber of the thermostatic tank, and the temperature measuring end of the standard thermometer is not more than 15mm away from the wireless pressure recorder, so as to ensure the accuracy of the measured ambient temperature of the wireless pressure recorder; a temperature controller and a heating unit are also provided in the inner chamber of the thermostatic tank, and the temperature controller is connected to the heating unit and the standard thermometer, and a preset temperature is set through a display screen exposed to the thermostatic tank provided by the temperature controller, and the temperature controller can adjust the heating unit according to the temperature value measured by the standard thermometer to reach the preset temperature, and the display screen displays the actual temperature in the thermostatic tank. The temperature of the inner chamber is uniform and the measured temperature value is accurate. The distance between the pressure lead pipe connecting the standard pressure source and the thermostatic tank is set to be at least 1.2m, so that the temperature of the external environment gas injected into the thermostatic tank will not be affected by the heat transfer of the thermostatic tank. A pressure relief valve is provided on the pressure lead pipe, so that the air pressure entering the thermostatic tank is the preset air pressure, which ensures the accuracy of the temperature and air pressure values ​​in the thermostatic tank, thereby ensuring the consistency between the calibration environment of the tested wireless pressure recorder and the actual working environment, and ensuring the accuracy and reliability of the calibration value of the wireless pressure recorder. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the embodiment of the utility model, the following is a brief introduction to the drawings required for the description of the embodiment, which constitute a part of the utility model. The schematic embodiments of the utility model and their descriptions explain the utility model and do not constitute an improper limitation on the utility model; in the drawings:

[0021] Figure 1 It is a schematic diagram of the technical solution structure of the wireless pressure recorder calibration device disclosed in the embodiment of the utility model;

[0022] Figure 2 for Figure 1 AA section view.

[0023] In the figure:

[0024] Constant temperature tank 1; main body 11; external thread interface 111; side wall 112; bottom plane 113; inner chamber 114; groove 115; cover body 12; internal thread interface 121; central channel 122; sealing ring 13; sealant 14; wire 15; standard thermometer 2; temperature measuring end 21; temperature controller 3; host 31; PID controller 311; display screen 32; upper display screen 321; lower display screen 322; heating unit 4; heating wire 41; pressure control unit 5; pressure lead pipe 51; pressure relief valve 52; standard pressure source 53; wireless pressure recorder 6. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model and the corresponding drawings; in the description of the utility model, it should be noted that the "including" mentioned in the specification and the claims is an open term, so it should be interpreted as "including but not limited to"; "several" refers to more than 3.

[0026] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0027] Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0028] like Figure 1-Figure 2 As shown, the technical solution disclosed by the utility model is:

[0029] A wireless pressure recorder calibration device comprises a sealed constant temperature tank 1, a

[0030] A standard thermometer 2, a temperature controller 3, a plurality of evenly distributed heating units 4 and a pressure control unit 5 installed outside the constant temperature tank 1 and connected to the constant temperature tank 1 in the inner chamber 114 of the temperature tank 1; wherein the temperature controller 3 is respectively connected to the standard thermometer 2 and the heating unit 4; the plurality of evenly distributed heating units 4 are respectively placed on the bottom plane 113 and the side wall 112 of the inner chamber 114 of the constant temperature tank 1 according to preset requirements.

[0031] The wireless pressure recorder 6 is placed on the bottom plane 113 , and the distance h from the temperature measuring end 21 of the standard thermometer 2 to the wireless pressure recorder 6 should satisfy: h≤15 mm.

[0032] like Figure 1-2 As shown, the preferred embodiment of the utility model:

[0033] A wireless pressure recorder calibration device comprises a sealed thermostatic tank 1, a standard thermometer 2 installed in an inner chamber 114 of the thermostatic tank 1, a temperature controller 3, a plurality of evenly distributed heating units 4, and a pressure control unit 5 installed outside the thermostatic tank 1 and connected to the thermostatic tank 1.

[0034] The thermostatic tank 1 comprises a main body 11 made of stainless steel and a cover 12 made of stainless steel which are detachably connected, an inner chamber 114 is provided inside, and a sealing device is provided between the main body 11 and the cover 12 .

[0035] In this embodiment, the external threaded interface 111 provided at the upper end of the main body 11 is screwed and connected with the internal threaded interface 121 provided at the lower end of the cover body 12; a groove 115 is provided at the upper end of the external threaded interface 111, and a sealing ring 13 is sleeved in the annular groove 115. The sealing device includes the groove 115 and the sealing ring 13. To ensure the sealing effect, two sets of the sealing device are provided in parallel.

[0036] A central channel 122 is provided at the center of the cover body 12, and the standard thermometer 2 matches the central channel 122, is inserted into the thermostatic tank 1 from the central channel 122, and is sealed by a sealant 14. The lower end of the standard thermometer 2 is a temperature measuring end 21, and the standard thermometer 2 is inserted in a vertical direction. A wireless pressure recorder 6 is placed on the bottom plane 113 of the inner chamber 114 of the thermostatic tank 1, and the distance h from the temperature measuring end 21 to the wireless pressure recorder 6 should satisfy: h≤15mm.

[0037] It should be noted that at least one wireless pressure recorder 6 is placed on the bottom plane 113 of the inner chamber 114 of the thermostatic tank 1. When multiple wireless pressure recorders 6 are placed together for calibration, the calibration efficiency is effectively improved.

[0038] The standard thermometer 2 is used to read the real-time temperature inside the thermostatic tank 1 during the pressure calibration process.

[0039] The temperature controller 3 includes a main unit 31 and a display screen 32 which are fixedly connected as one. The main unit 31 is equipped with a PID controller. The main unit 31 is located in the inner chamber 114 . The display screen 32 is embedded in the side wall 114 of the thermostatic tank 1 , and the panel of the display screen 32 is located on the outer surface of the side wall 114 .

[0040] The display screen 32 includes an upper display screen 321 and a lower display screen 322. The upper display screen 321 is used to display the set target temperature, and the lower display screen 322 is used to display the real-time actual temperature in the constant temperature tank 1. In this embodiment, the upper display screen 321 is set as a touch screen, and the target temperature is set manually.

[0041] The heating unit 4 selected in this embodiment is set as a heating wire 41, which is evenly distributed on the bottom plane 113 and the side wall 112 of the thermostatic tank 1, and is evenly distributed on the side wall at least 1 / 3 and 2 / 3 away from the bottom plane. For example, the height of the side wall 112 of the inner chamber 114 is set to S, and the heating wires 41 are evenly distributed on the side wall 112 at least 1S / 3 and 2S / 3 away from the bottom plane of the thermostatic tank 1. The specific number is set according to actual needs, so that the ambient temperature of the inner chamber 114 is uniform and the measured temperature value is accurate. Figure 1 shown.

[0042] The temperature controller 3 is connected to all the heating wires 41 and the standard thermometer 2 through a wire 15. The standard thermometer 2 is used to read the real-time temperature inside the thermostatic tank 1 during the pressure calibration process. The temperature controller 3 is controlled by a PID controller 311, that is, the temperature controller 3 adjusts the heating wire 41 according to the preset temperature value and the actual measured value of the standard thermometer 2. The temperature control adopts a control method of gradually approaching the target value to reduce temperature control overshoot, improve the temperature uniformity and stability of the constant temperature zone inside the thermostatic tank 1, and avoid temperature overshoot in the thermostatic tank 1, thereby damaging the wireless pressure recorder 6 under test.

[0043] The pressure control unit 5 includes a standard pressure source 53 and a pressure-guiding pipe 51. The pressure-guiding pipe 51 is installed between the standard pressure source 53 and the constant temperature tank 1. The pressure-guiding pipe 51 is configured as a soft high-pressure gas pipe, which is connected to the constant temperature tank 1. A pressure relief valve 52 is provided on the pressure-guiding pipe 51. The pressure relief operation can be performed through the pressure relief valve 52 to control the gas entering the constant temperature tank 1 so that the air pressure in the constant temperature tank 1 is a preset air pressure.

[0044] The distance L between the thermostatic tank 1 and the standard pressure source 53 should satisfy: L≥1.2m, so that the temperature of the gas entering the thermostatic tank 1 does not exceed 50°C, that is, when the length of the pressure-inducing pipe 51 meets the requirement, the external environmental gas injected during pressurization will not be affected by the heat transfer of the thermostatic tank 1; the controllability of the temperature and air pressure values ​​in the thermostatic tank 1 is ensured, thereby ensuring the consistency between the calibration environment of the tested wireless pressure recorder 6 and the actual working environment, and ensuring the accuracy and reliability of the calibration value of the wireless pressure recorder 6.

[0045] In this embodiment, the thermostatic tank 1 can achieve a temperature environment ranging from room temperature to 150° C., and provide a closed space pressure field of (0~500) kPa.

[0046] By adjusting a temperature through the temperature controller 3, multiple pressure points can be calibrated. For example, the temperature is set at 50°C, and the pressure is adjusted to 100 kPa, 200 kPa, 300 kPa, 400 kPa, and 500 kPa respectively to calibrate the wireless pressure recorder 6, thereby meeting a variety of working environments and improving calibration efficiency.

[0047] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, all of which are within the protection of the utility model.

Claims

1. A wireless pressure recorder calibration device, characterized in that: It comprises a sealed thermostatic tank, a standard thermometer installed in the inner chamber of the thermostatic tank, a temperature controller, a plurality of evenly distributed heating units, and a pressure control unit installed outside the thermostatic tank and connected to the thermostatic tank; wherein the temperature controller is electrically connected to the standard thermometer and the heating unit respectively; the plurality of evenly distributed heating units are respectively placed on the bottom plane and the side wall of the inner chamber of the thermostatic tank according to preset requirements; The wireless pressure recorder is placed on the bottom plane, and the distance h from the temperature measuring end of the standard thermometer to the wireless pressure recorder should satisfy: h≤15mm.

2. The wireless pressure recorder calibration device according to claim 1, characterized in that: The thermostatic tank comprises a main body made of stainless steel and a cover made of stainless steel which are detachably connected, and a sealing device is arranged between the main body and the cover.

3. The wireless pressure recorder calibration device according to claim 2, characterized in that: The external threaded interface provided at the upper end of the main body is screwed and connected with the internal threaded interface provided at the lower end of the cover body. The sealing device includes a sealing ring and a groove for placing the sealing ring, and at least two sets of the sealing device are provided in parallel.

4. The wireless pressure recorder calibration device according to claim 2, characterized in that: The temperature controller includes a main unit and a display screen which are fixedly connected as one. The main unit with a built-in PID controller is located in the inner chamber. The display screen is embedded on the side wall of the thermostatic tank body, and the display screen panel is located on the outer surface of the side wall of the body.

5. The wireless pressure recorder calibration device according to claim 4, characterized in that: The display screen includes an upper display screen and a lower display screen. The upper display screen is configured as a touch screen for setting a target temperature, and the lower display screen is configured to display the actual temperature in the thermostatic tank in real time.

6. The wireless pressure recorder calibration device according to claim 1, characterized in that: The heating unit includes heating wires, which are evenly distributed on the bottom plane and the side walls, and at least evenly distributed on the side walls at 1 / 3 and 2 / 3 of the distance from the bottom plane.

7. The wireless pressure recorder calibration device according to claim 1, characterized in that: The pressure control unit includes a standard pressure source, a pressure-leading pipe is provided between the standard pressure source and the constant temperature tank, the pressure-leading pipe is configured as a soft high-pressure air pipe, is communicated with the constant temperature tank, and a pressure relief valve is provided on the pressure-leading pipe, so that the air pressure entering the constant temperature tank is a preset air pressure.

8. The wireless pressure recorder calibration device according to claim 7, characterized in that: The distance L between the thermostatic tank and the standard pressure source should satisfy: L≥1.2m, so that the temperature of the gas entering the thermostatic tank does not exceed 50°C.

9. The wireless pressure recorder calibration device according to claim 2, characterized in that: The temperature measuring end of the standard thermometer is inserted into the inner chamber of the thermostatic tank through the central channel provided on the cover body, and the standard thermometer is in a vertically suspended state, and a sealant is provided between the standard thermometer and the central channel.

10. The wireless pressure recorder calibration device according to claim 9, characterized in that: At least one calibrated wireless pressure recorder is placed in the inner chamber of the constant temperature tank.

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