Improved liquid specific heat capacity measuring instrument

Abstract

An improved liquid specific heat capacity measuring instrument is composed of a measuring machine core and a box body, the measuring machine core is composed of a front support, a constant-current frame and an instrument panel, the front support of the machine core is composed of four 15 * 10 mm aluminum alloy battens, and the constant-current frame is composed of a constant water pressure device, a spiral pipe and a stabilized voltage supply. An inlet thermometer dial, an outlet thermometer dial, a power switch, a voltage and current adjusting switch, a voltage digital meter and a current digital meter are arranged on the instrument panel, a water outlet of the constant water pressure device is connected with a water inlet of the spiral pipe through a 304 stainless steel valve, a resistance wire penetrates through the spiral pipe, and the two ends of the resistance wire are connected with a voltage-stabilized power supply, the power switch and an ampere meter in series. Two ends of the resistance wire are connected in parallel with a voltmeter, and a water inlet and a water outlet of the spiral pipe are provided with thermometer sensor sockets. The influence of heat dissipated to the environment on an experiment result can be thoroughly eliminated, the uncertainty of the measurement result reaches 1%, the instrument of the measuring instrument is protected from being damaged, the valve is designed to be a 304 stainless steel valve and an anti-aging rubber pipe, the opening of an instrument panel is changed, and a new design is made for introducing a power supply.

Description

Technical field:

[0001] The utility model relates to a specific heat capacity measuring instrument, in particular to an improved liquid specific heat capacity measuring instrument. Background technology:

[0002] The existing liquid specific heat capacity measuring instrument, although using the electric heating method, according to the dynamic characteristics and replication principle of TRIZ theory, has solved the problem that the uncertainty of the measurement result is difficult to reach within 5%, and has made the uncertainty of the measurement result reach 1%. After more than a year of use, the liquid specific heat capacity measuring instrument still has shortcomings in the design of the valve for adjusting the liquid flow rate, the selection of the hose and the convenience of maintenance. Summary of the invention:

[0003] The utility model provides an improved liquid specific heat capacity measuring instrument, which can not only protect its instrument from damage, but also has a new design for the opening of the instrument panel and the introduction of power supply, so as to ensure the convenience of instrument use and maintenance and the reliability of quality.

[0004] The technical solution of the utility model is as follows:

[0005] The improved liquid specific heat capacity measuring instrument consists of two parts: a measuring movement and a box body. The measuring movement consists of a front bracket, a constant current rack and an instrument panel.

[0006] The front bracket of the movement is composed of four 15×10mm aluminum alloy strips.

[0007] The constant current rack is composed of a constant water pressure device, a spiral tube and a voltage-stabilized power supply.

[0008] The instrument panel is equipped with inlet and outlet thermometer dials, a power switch, voltage and current adjustment switches, and voltage and current digital meters.

[0009] The water outlet of the constant water pressure device is connected with the water inlet of the spiral tube through a stainless steel valve.

[0010] The wastewater outlet of the constant water pressure device is connected with an anti-aging hose so that the wastewater can pass through the hole in the box.

[0011] An insulating resistance wire is inserted into the spiral tube, and a voltage-stabilizing power supply, a power switch and an ammeter are connected in series at both ends of the resistance wire.

[0012] A voltmeter is connected in parallel at both ends of the resistance wire.

[0013] The water inlet and outlet of the spiral tube are provided with thermometer sensor sockets, and the water outlet of the spiral tube is connected with an anti-aging hose so that the liquid to be measured can pass through the box for easy measurement.

[0014] The voltage-stabilized power supply is connected to the voltage and current regulating switch.

[0015] The front support of the movement, the constant current frame and the voltage-stabilized power supply are all fixed on the bottom plate of the measuring movement.

[0016] The instrument panel is hinged to the left support of the front bracket of the movement

[0017] The measuring instrument box consists of a box and a cover. A groove is provided at the lower end of the box. The two sides of the measuring movement bottom plate are pushed into the groove and fixed with screws.

[0018] A voltage-stabilized power supply insertion port is provided at the lower right end of the box body, and a power plug is installed at the insertion port. A power socket is installed on the bottom plate of the movement. The power plug in the chassis can be inserted into the power socket on the bottom plate of the movement. A constant water pressure wastewater discharge port is provided at the lower right end of the box body, and a measuring liquid flow outlet is provided at the upper left end of the box body.

[0019] The upper end surface of the box body is provided with a water inlet of a constant water pressure device.

[0020] Three measuring instrument level adjustment screws are provided at the lower end of the box.

[0021] There is a storage box inside the box cover for power supply lead-in wires and level adjustment screws. When the measuring instrument is not in use, remove the level adjustment screws and put them into the storage box on the box cover, and leave the nuts at the lower end of the box.

[0022] The left side of the box cover is hinged to the box body, and two buckles are arranged on the right side. The right side of the box body is provided with an instrument case handle. Description of the drawings:

[0023] Figure 1 Unboxing view of the improved liquid specific heat capacity measuring instrument

[0024] Figure 2 Schematic diagram of the measuring mechanism structure of the improved liquid specific heat capacity measuring instrument

[0025] Figure 3 Schematic diagram of the constant current frame structure of the improved liquid specific heat capacity measuring instrument

[0026] Figure 4 Schematic diagram of the front bracket of the movement

[0027] Figure 5 Top view of the support plate of the constant water pressure device

[0028] Figure 6 Schematic diagram of the instrument panel

[0029] In attachment 1-6, the constant current frame bottom plate 1, the constant current frame support 2, the constant current frame upper support plate 3, the constant water pressure device water container 4, the constant water pressure device positioning water pipe 5, the wastewater outlet 6, the constant water pressure device water container outlet 7, the spiral tube 8, the spiral tube water inlet regulating stainless steel valve 9, the spiral tube water inlet 10, the water inlet thermometer sensor 11, the spiral tube water outlet 12, the water outlet thermometer sensor 13, the measuring movement bottom plate 14, the instrument panel 15, the constant current frame and the machine The support plate on the front bracket of the core has fixed pillars 16, voltage-stabilized power supply 17, voltage and current digital meters 18, constant water pressure water container support plate 19, measuring instrument box tower buckle 20, instrument box handle 21, storage box in the instrument box cover 22, instrument level adjustment screw 23, power switch 24, power adjustment switch 25, insulation resistance wire 26, voltage-stabilized power supply access port 27, thermometer dial 28, constant water pressure device water inlet 29, power socket 30 on the bottom plate 14 of the movement. Specific implementation method:

[0030] Combination Figure 1-6 To further illustrate the present invention, a constant water pressure device water container drag plate 19 is inserted between two constant current pillars 2, and four constant current pillars 2 are fixed with M4 nuts between the constant current frame bottom plate 1 and the constant current frame upper support plate 3, such as Figure 4 As shown in the figure, four 15×10mm aluminum alloy strips are used to make the front support of the movement, and the front support of the movement is as shown in the figure. Figure 2 As shown, it is fixed on the bottom plate 14 of the movement, and then the upper support plate 3 of the constant current frame is fixed to the upper support plate of the front support of the movement by a fixed support 16.

[0031] Drill two holes with a diameter of 8 mm under the constant water pressure water container 4 to equip it with a positioning water pipe 5 and a constant water pressure water outlet 7, and seal it with glass glue. Connect the anti-aging hose of the wastewater outlet to the lower end of the positioning water pipe 5, insert the insulating resistance wire 26 into the spiral tube, adjust the stainless steel valve 9 of the spiral tube water inlet at the constant water pressure water outlet 7, connect the other end of the regulating valve 9 to the spiral tube water inlet 10 with an anti-aging hose, insert the water inlet thermometer sensor 11 into the water inlet 10, insert the water outlet thermometer sensor 13 into the spiral tube water outlet 12, and connect the anti-aging hose to the water outlet 12 to take the measured liquid out of the instrument box.

[0032] The constant current frame bottom plate 1 is fixed on the measuring movement bottom plate 14. The voltage-stabilized power supply 17 is fixed on the measuring movement bottom plate 14. The constant current frame is fixed to the upper support plate of the movement front bracket by a fixed support 16, and the instrument panel board 15 is hingedly connected to the left column plate of the measuring movement front bracket. When adjusting the flow rate, the instrument panel board 15 is rotated to the left. When the instrument panel board 15 is rotated to coincide with the plane of the measuring movement front bracket, the instrument panel 15 is fixed to the left column plate of the movement front bracket with an M6 butterfly nut, and the dial of the water inlet thermometer sensor 11 and the dial of the water outlet thermometer sensor 13 are embedded in the instrument panel board 15. The output of the voltage-stabilized power supply 17 is electrically connected to the insulating resistance wire 26 in the spiral tube. Connect the ammeter and voltmeter to the measuring circuit as required and embed the ammeter and voltmeter into the instrument panel board. Embed the voltage-stabilized power supply access port 27 into the left side of the instrument box. Install the power switch at the corresponding position of the instrument panel 15, connect a power plug in the voltage stabilized power supply inlet 27 in the instrument box, install a power socket 30 on the movement board, and electrically connect the socket 30 to the stable power supply 17. Install the power adjustment switch 25 at the corresponding position of the instrument panel 15, and insert the other end into the corresponding socket of the voltage stabilized power supply 17.

[0033] Three instrument level adjustment nuts 23 are installed at the bottom of the measuring instrument box. The installed bottom plate 14 of the measuring movement is pushed into the grooves on both sides of the lower end of the measuring instrument box, and then fixed with screws. The power input line is inserted into the voltage-stabilized power inlet 27, and the other end is connected to the power supply. The power plug in the power inlet 27 in the instrument box is inserted into the power socket 30.

[0034] Place the liquid to be tested and the instrument in a constant temperature environment and let it stand for 24 hours. Connect the liquid to be tested to the constant water pressure device water container 4 from the water inlet 29 of the constant water pressure device at the upper end of the instrument box. As the water level in the water container rises, the water level plane in the spiral tube rises. When the horizontal plane in the water container 4 reaches the upper end of the constant water pressure device positioning water pipe 5, water flows out of the wastewater outlet 6. At this time, water also flows out of the spiral tube outlet 12. Adjust the spiral tube water inlet regulating stainless steel valve 9 to make the spiral tube outlet 12 drip in drops and not in a streamline! Adjust the amount of water entering the constant water pressure device water container 4 through the water inlet of the constant water pressure device on the box. As long as there is water dripping from the wastewater outlet 6 of the constant water pressure device positioning water pipe, the constant water pressure can be guaranteed to remain unchanged!

[0035] After the power supply is turned on and the liquid is allowed to flow for several minutes, the two thermometers have the same readings. Then, the power supply adjustment switch 25 is adjusted to the minimum, the power supply 24 is turned on, and the adjustment switch 25 is rotated to make the voltage meter value about 10V and the current about 1.3A. The outlet thermometer reading rises and stabilizes, and then the current meter and voltage meter values ​​are adjusted. The dial of the outlet thermometer sensor 13 and the dial of the inlet thermometer sensor 11 have a difference of about 10 degrees.

[0036] Check whether the liquid flow rate is stable. Measure it three times for five minutes each time and collect the mass of the flowing liquid. If it is equal within the error range, the experiment can be carried out.

[0037] Measure three times in a row, each time for ten minutes, collect the mass of the liquid flowing through, take the average value, set it as m1, and record the current and voltage values, experimental time, and thermometer reading: I1, V1, t, T1, T2.

[0038] Turn on the instrument panel, change the flow rate through the spiral water inlet regulating stainless steel valve 9, and then adjust the voltage and current through the power regulating switch 25 to make the dial readings of the outlet thermometer sensor 13 and the inlet thermometer sensor 11 the same as in the previous experiment, and stabilize.

[0039] Check whether the flow rate is stable, the method is the same as above.

[0040] If the flow rate is stable, a second experiment can be performed.

[0041] As before, measure three times in a row, each time for ten minutes, collect the mass of the liquid flowing through, take the average value, set it as m2, record the current, voltage, experimental time, and thermometer readings: I2, V2, t, T1, T2. Substitute into the formula c = (I2V2-I1V1) / ((m2-m1)(T2-T1))(J / kg·℃).

Claims

1. The improved liquid specific heat capacity measuring instrument consists of a measuring movement and a box. The measuring movement consists of a front bracket, a constant current rack and an instrument panel. The front bracket of the movement consists of four 15×10mm aluminum alloy strips. The constant current rack consists of a constant water pressure device, a spiral tube and a voltage-stabilized power supply. The instrument panel has inlet and outlet thermometer dials, a power switch, a voltage and current adjustment switch, and a voltage and current digital meter. Its characteristics are: The water outlet of the constant water pressure device is connected to the water inlet of the spiral tube through a stainless steel valve. The wastewater outlet of the constant water pressure device is connected with an anti-aging hose so that the wastewater can pass through the hole in the box body. A resistance wire is passed through the spiral tube. A voltage-stabilizing power supply, a power switch and an ammeter are connected in series at both ends of the resistance wire. A voltmeter is connected in parallel at both ends of the resistance wire. The water inlet and outlet of the spiral tube are provided with thermometer sensor sockets. The water outlet of the spiral tube is connected with an anti-aging hose so that the liquid to be measured can pass through the box body for easy measurement.

2. The improved liquid specific heat capacity measuring instrument according to claim 1 is characterized in that: The voltage-stabilized power supply is connected to the voltage and current regulating switch.

3. The improved liquid specific heat capacity measuring instrument according to claim 1 is characterized in that: The front support of the movement, the constant current frame and the voltage-stabilized power supply are all fixed on the bottom plate of the measuring movement, and the instrument panel is hingedly connected to the left support of the front support of the movement through a hinge.

4. The improved liquid specific heat capacity measuring instrument according to claim 1 is characterized in that: The measuring instrument box consists of a box and a cover. There is a groove at the lower end of the box. The two sides of the measuring movement bottom plate are pushed into the groove and fixed with screws. There is a voltage-stabilized power supply insertion port at the lower right end of the box. The insertion port is equipped with a power plug and a power socket is installed on the movement bottom plate. The power plug in the box can be inserted into the power socket on the movement board. There is a constant water pressure wastewater discharge outlet at the lower right end of the box, a measuring liquid flow outlet at the upper left end of the box, and a constant water pressure device water inlet on the upper end face of the box.

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