CN209841744U - Constant-temperature water circulation controller - Google Patents
Constant-temperature water circulation controller Download PDFInfo
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- CN209841744U CN209841744U CN201920630859.9U CN201920630859U CN209841744U CN 209841744 U CN209841744 U CN 209841744U CN 201920630859 U CN201920630859 U CN 201920630859U CN 209841744 U CN209841744 U CN 209841744U
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Abstract
The utility model discloses a thermostatic water circulation controller, including chassis exterior, water container, water-cooling row, fan, water pump, the water container is installed in chassis exterior's inside, the fan is installed on chassis exterior curb plate, the water-cooling row is installed at the fan back, the bottom of water container is equipped with the heating pipe. Through reasonable structural design, the constant-temperature water circulation controller can ensure the precision of the metal thermal expansion coefficient during measurement, and the instrument is convenient to operate and high in safety; the temperature is controlled by the fan and the water cooling row, and the temperature is controlled by the heating pipe to be raised, so that the stability of the temperature in the water container is ensured.
Description
Technical Field
The utility model relates to a thermostatic water circulation control system field specifically indicates a thermostatic water circulation controller for experiments.
Background
The expansion of an object due to a change in temperature is called "thermal expansion". Generally, the external pressure is unchanged, and most substances increase in volume when the temperature is increased and decrease in volume when the temperature is decreased. There are also a few substances in a certain temperature range, and the volume of the substances is reduced when the temperature is increased. Under the same conditions, the expansion of solids is much smaller than that of gases and liquids, and it is difficult to directly measure the volume expansion of solids. However, it is assumed that the solid does not change its shape when the temperature increases, and that the solid generally expands in the same direction. Therefore, the linear expansion law of the solid in one direction can be used for characterizing the volume expansion of the solid.
The DH4608A model metal thermal expansion coefficient tester of the company is a direct-reading type tester for the solid linear thermal expansion coefficient, can quantitatively examine the thermal expansion and cold contraction characteristics of substances in the common physical experiment teaching of universities and colleges, and can accurately measure and calculate the linear expansion coefficient of metal. The material has the original length of L in a certain temperature range0The elongation delta L of the heated object is approximately in direct proportion to the temperature increase delta t of the heated object and is in direct proportion to the original length L0Is also proportional, i.e.: Δ L ═ α L0At. Where α is the linear thermal expansion coefficient of the solid. Experiments prove that: the linear expansion coefficients of different materials are different. Students can measure the equipped experimental stainless steel pipes, copper pipes and the like and calculate the linear expansion coefficients of the experimental stainless steel pipes, the copper pipes and the like. The instrument consists of a constant-temperature water circulation controller, a micrometer, a tubular measured material and a PT100 thermometer, and has the advantages of visual experimental method and high measurement precision.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a constant temperature water circulation controller, which can ensure the accuracy of the metal thermal expansion coefficient measurement, the operation of the instrument is convenient, and the safety is high through reasonable structural design; the temperature is controlled by the fan and the water cooling row, and the temperature is controlled by the heating pipe to be raised, so that the stability of the temperature in the water container is ensured.
In order to achieve the above purpose, the utility model provides a following technical scheme: the utility model provides a thermostatic water circulation controller, includes chassis exterior, water receptacle, water-cooling row, fan, water pump, the water receptacle is installed in chassis exterior's inside, the fan is installed on chassis exterior curb plate, the water-cooling row is installed at the fan back, the bottom of water receptacle is equipped with the heating pipe, the top of water receptacle is equipped with sensor and filler, be equipped with two ball float switches in the water receptacle, the top of filler is equipped with water filling stifle and vexed head, be equipped with water level indication, water pump switch, fan switch, sensor interface, thermometer, temperature-controlled meter on any side board of chassis exterior, be equipped with return water mouth, gap, delivery port, outlet, air switch, power input on chassis exterior's the front bezel.
Preferably, pagoda joints are respectively arranged on the water container, the water cooling drain, the water pump, the water return port, the overflow port, the water outlet and the water outlet.
Preferably, the water filling blank cap is detachably connected with the water filling port, and a waterproof gasket is arranged at the joint of the water filling blank cap and the top plate of the case shell.
Preferably, a partition is arranged inside the chassis shell.
The utility model has the advantages that: through reasonable structural design, the constant-temperature water circulation controller can ensure the precision of the metal thermal expansion coefficient during measurement, and the instrument is convenient to operate and high in safety; the temperature is controlled by the fan and the water cooling row, and the temperature is controlled by the heating pipe to be raised, so that the stability of the temperature in the water container is ensured.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
Fig. 2 is a schematic view of the front direction structure of the present invention.
Fig. 3 is a schematic side view of the present invention.
Fig. 4 is a schematic view of the structure of the present invention in the top view direction.
Fig. 5 is a schematic perspective view of the water container.
Fig. 6 is a front-direction structural schematic diagram of the water container.
Fig. 7 is a side view schematically showing the structure of the water container.
Fig. 8 is a top view structural schematic diagram of the water container.
Fig. 9 is a schematic structural diagram of any one side plate of the chassis housing.
1. A chassis housing; 10. a pagoda joint; 101. water level indication; 102. a water pump switch; 103. a fan switch; 104. a sensor interface; 105. a thermometer; 106. a temperature control meter; 107. a water return port; 108. an overflow port; 109. a water outlet; 110. a water outlet; 111. an air switch; 112. a power switch; 113. inputting a power supply; 2. a water container; 21. heating a tube; 22. a sensor; 23. a water filling port; 24. a double-floating-ball switch; 25. adding water to cover the bottle; 26. choke plug; 27. a waterproof gasket; 3. water cooling and draining; 4. a fan; 5. a water pump; 6. a separator.
Detailed Description
The present invention will be further described with reference to the accompanying drawings. The following examples are exemplary and not intended to limit the scope of the claims.
Referring to fig. 1-9, a thermostatic water circulation controller of this embodiment includes a chassis housing 1, a water container 2, a water cooling bar 3, a fan 4, and a water pump 5, where the water container 2 is installed inside the chassis housing 1, the fan 4 is installed on a side plate of the chassis housing 1, the water cooling bar 3 is installed on a back side of the fan 4, a heating pipe 21 is installed at a bottom of the water container 2, a sensor 22 and a water filling port 23 are installed at a top of the water container 2, a double-float ball switch 24 is installed in the water container 2, a water filling cap 25 and a cap 26 are installed at a top of the water filling port 23, a water level indicator 101, a water pump switch 102, a fan switch 103, a sensor interface 104, a thermometer 105, and a temperature control meter, the front plate of the chassis housing 1 is provided with a water return port 107, an overflow port 108, a water outlet 109, a water outlet 110, an air switch 111, a power switch 112, and a power input 113. Pagoda joints 10 are respectively arranged on the water container 2, the water-cooling discharge 3, the water pump 5, the water return port 107, the overflow port 108, the water outlet 109 and the water outlet 110. The water filling cover 25 is detachably connected with the water filling port 23, and a waterproof gasket 27 is arranged at the joint of the water filling cover and the top plate of the case shell 1. The inside of the chassis housing 1 is provided with a partition 6.
During assembly, the pagoda joints 10 on the water container 2 are respectively connected with the corresponding water-cooling rows 3, the water pump 5, the water return port 107, the overflow port 108, the water outlet 109 and the corresponding pagoda joints 10 of the water outlet 110 through water pipes, the other pagoda joint 10 of the water-cooling row 3 is connected with the other pagoda joint 10 of the water pump 5 through water pipes, the water filling cover 25 is connected with the water filling port 23 at the top of the water container 2 in a detachable connection mode such as threaded connection and loose socket connection, the bottom of the water filling cover 25 is abutted to the top plate of the case shell 1, the power switch 112 is plugged with a power plug, and the water return port 107 and the corresponding pagoda joints 10 of the water.
When the temperature-control water heater is used, water in the water container 2 flows unidirectionally in the water container 2, the water-cooling row 3 and the water pump 5 to form a rapid temperature-control cycle, the fan 4 works at the position of the water-cooling row 3 to reduce the water temperature, and the heating pipe 21 works at the position of the water container 2 to improve the water temperature, so that the aim of rapidly adjusting the water temperature is fulfilled. The water filling opening 23 is provided with a water filling closure cap 25 and a closure head 26, so that water can be conveniently filled, and meanwhile, the water in the water container 2 is prevented from overflowing from the water filling opening.
As an improvement of safety, an electrically controlled temperature switch is arranged at the bottom of the water container 2 and used for opening and closing the heating pipe, controlling the temperature in the water container and ensuring the safe operation of instruments.
Wherein, the water level indicates: the water level in the water circulation system is indicated, the water circulation system is used for the first time, water needs to be added to the system from a water adding port until the water level indication upper limit lamp is turned on. Before water is added, the water outlet and the water return port are correspondingly connected with the tester, the water outlet is in a closed state, and the water overflow port is provided with a water receiving container (for preventing excessive water addition from overflowing). If the low water level alarm lamp is turned on and gives an alarm, the power supply is turned off immediately, and the system power supply is turned on after sufficient water is injected into the system. When the water level is in normal work, the recommended water level is between the lower limit and the upper limit, and the water level cannot be lower than the lower limit;
switching on and off the water pump: starting water circulation (ensuring that the water outlet and the water return port are connected with an external tester before starting);
a fan switch: after the experiment is finished, the temperature control meter is set below the room temperature, and a fan switch is started to dissipate heat of water.
A sensor: the sensor interface is connected with an external PT100 temperature sensor, and a thermometer window displays a temperature value;
a thermometer: indicating the temperature of externally accessed PT100, displaying the resolution of 0.1 ℃ and measuring the range of 0-200 ℃;
temperature control meter: setting the water temperature in a water circulation system, and controlling the water temperature, wherein the stability is +/-0.2 ℃; note that the set temperature cannot exceed 85 ℃; the specific operation is described in the accessories;
a water return port: circulating water flows through the tested object through the water outlet and then returns to the interface of the system;
an overflow port: when the water level of the water storage container of the system is excessive, a water container is required to be placed at the overflow outlet;
water outlet: a system water outlet;
a water outlet: the water tank is used for emptying the system;
an air switch: the safety protection switch needs to be manually opened during normal work.
Usually, the PT100 temperature sensor mounting seat is arranged in the middle of a sample to be measured, namely the middle of the baffle and the right fixing point, and the mounting seat is wrapped by a heat-insulating material. One side of the mounting seat is provided with a small hole, PT100 is coated with heat-conducting silicone grease and inserted into the small hole, and the output end of the PT100 is connected with a sensor socket on the constant-temperature water circulation control system, so that the actual temperature value of a sample to be measured can be displayed.
The positions of the micrometer and the baffle are properly installed, so that a gap is not formed between the micrometer and the baffle, and the micrometer is ensured to have enough extension space.
And (3) connecting the two ends of the sample with a silicone tube respectively with a water outlet and a water inlet of a constant-temperature water circulation control system.
The experimental notes:
1. the temperature setting for this experiment should not be higher than 80 ℃.
2. When the experimental instrument is not used for a long time, the water in the water circulation system is not required to be emptied.
3. If the circulating water is too dirty, clean water should be replaced in time, and pure water is recommended.
4. And when the water circulation system is not connected with the tester, the water pump switch is prohibited to be started.
5. After the experiment is finished, please set the temperature control meter below the room temperature, and turn on the fan switch to reduce the water temperature to near the room temperature;
6. the dial indicator is a precise instrument and cannot be extruded forcefully; after the experiment is finished, please take down the dial indicator and place the dial indicator in a configured box; avoid the long-time stress fatigue of amesdial and receive the influence of air humidity to cause the condition of rustting.
7. Timely supplementing water after the water level lower limit indicator lamp is turned off; and after the low water level alarm, the power supply is immediately turned off to supplement water or check whether the instrument works abnormally.
8. The instrument and the table cannot be vibrated in the experimental process, otherwise, the dial indicator reading is influenced. Experimental procedure
And l, fixing the experimental sample on an experimental frame, screwing the locking screw, and paying attention to the fact that the baffle plate is opposite to the dial indicator.
2. The relative position of the dial indicator and the baffle is adjusted, so that a gap is not formed between the dial indicator and the baffle, and the micrometer is ensured to have enough extension space.
3. The position of the PT100 mount was adjusted to be in the middle of the sample to be measured.
4. The PT100 is coated with heat-conducting silicone grease and inserted into a small hole of a PT100 mounting seat, and a plug of a PT100 sensor is connected with a sensor socket on a constant-temperature water circulation control system.
5. One end of the sample is connected with the water outlet of the water circulation system by a silicone tube, and the other end is connected with the water inlet of the water circulation system.
6. Firstly, filling water into a water tank of a constant-temperature water circulation control system, and paying attention to the fact that a water receiving container needs to be placed at an overflow port to prevent water from overflowing; stopping adding water when the water level upper limit indicator lamp is turned on; the 'water outlet' is ensured to be in a closed state in the water adding process.
7. And turning on a power switch and an air switch, turning on a water pump switch, and starting water circulation.
8. Setting a temperature control point every 10 ℃, recording an actually measured temperature value on the sample and a numerical value read on a dial indicator (observing the change condition of the actually measured temperature of the sample after the temperature of the water circulation system to be set is stable, and starting to read when the actually measured temperature also tends to be stable).
9. From the data Δ L and Δ t, by the formula:
calculating the linear thermal expansion coefficient; plots of Δ t (as x-axis) and Δ L (as y-axis) were drawn and observed for linearity.
Different metal bar samples were used instead, and the respective linear thermal expansion coefficients were measured and calculated, respectively. The percentage error of the measurement is calculated in comparison with the reference value.
The experimental principle of the instrument is as follows: the original length is L within a certain temperature range0(at t)0Length at 0 c), the solid generally expands due to increased thermal motion of the atoms, and at temperature t (unit c), the elongation Δ L, which is the increase in temperature Δ t (t-t) with temperature0) Approximately proportional to the original length L0Is also proportional, i.e.:
△L＝α×L0×△t
the total length at this time is:
Lt＝L0+△L
where α is the linear expansion coefficient of the solid, which is one of the thermal properties of the solid material. In the case of a small temperature change, α is a constant, and can be obtained by the following formulae (1) and (2)
As can be seen from the above formula, the physical meaning of α: the ratio of the elongation Δ L of an object to its length at 0 ℃ for each increase in temperature of 1 ℃. A is a small quantity and the appendix lists the alpha values for several common solid materials. When the temperature variation is large, α can be described by a polynomial of t:
α＝A+Bt+Ct2+……
wherein A, B and C are constants.
In practical measurements, it is generally determined that the solid material is at room temperature t1Lower length L1And at temperature t1To t2The amount of elongation therebetween, the coefficient of thermal expansion can be obtained such that the obtained coefficient of thermal expansion is an average coefficient of thermal expansion
In the formula L1And L2Respectively at t for the object1And t2Length of lower, DeltaL21＝L2-L1Is of length L1At a temperature of from t1Rise to t2Elongation of (3). The physical quantity we need to measure directly in the experiment is Δ L21，L1，t1And t2。
In order to obtain accurate measurement results, therefore, we need to obtain accurateThus not only for Δ L21，t1And t2Making accurate measurements, and expanding to Δ Li1And the corresponding temperature tiThe measurement of (2). Namely:
in the experiment, the heating temperature is set at equal temperature intervals (such as equal interval of 5 ℃ or 10 ℃), so that a corresponding series of delta L are measuredi1. The obtained measurement data is subjected to line fitting by using a least square method, and the average thermal expansion coefficient in a certain temperature range can be obtained from the slope of the line
The scope of the present invention is not limited to the above embodiments and their variations. The present invention is not limited to the above embodiments, and other modifications and substitutions may be made by those skilled in the art.
Claims (4)
1. A thermostatic water circulation controller is characterized in that: including chassis exterior (1), water receptacle (2), water-cooling row (3), fan (4), water pump (5), install in the inside of chassis exterior (1) water receptacle (2), install on chassis exterior (1) curb plate fan (4), water-cooling row (3) are installed in fan (4) back, the bottom of water receptacle (2) is equipped with heating pipe (21), the top of water receptacle (2) is equipped with sensor (22) and filler (23), be equipped with two ball switches (24) that float in water receptacle (2), the top of filler (23) is equipped with water feeding stifle (25) and vexed head (26), be equipped with water level indication (101), water pump switch (102), fan switch (103), sensor interface (104), thermometer (105), temperature control table (106) on the board of any side of chassis exterior (1), be equipped with return water mouth (107) on the front bezel of chassis exterior (1), An overflow port (108), a water outlet (109), a water outlet (110), an air switch (111), a power switch (112) and a power input (113).
2. A thermostatic water circulation controller according to claim 1, characterized in that: pagoda joints (10) are respectively arranged on the water container (2), the water-cooling row (3), the water pump (5), the water return port (107), the overflow port (108), the water outlet (109) and the water outlet (110).
3. A thermostatic water circulation controller according to claim 1, characterized in that: the water filling cover (25) is detachably connected with the water filling port (23), and a waterproof gasket (27) is arranged at the joint of the water filling cover and the top plate of the case shell (1).
4. A thermostatic water circulation controller according to claim 1, characterized in that: a partition plate (6) is arranged inside the case shell (1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920630859.9U CN209841744U (en) | 2019-05-06 | 2019-05-06 | Constant-temperature water circulation controller |
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| CN201920630859.9U CN209841744U (en) | 2019-05-06 | 2019-05-06 | Constant-temperature water circulation controller |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114646284A (en) * | 2022-03-16 | 2022-06-21 | 重庆邮电大学 | Temperature compensation method for geometric parameters of precision gear |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114646284A (en) * | 2022-03-16 | 2022-06-21 | 重庆邮电大学 | Temperature compensation method for geometric parameters of precision gear |
| CN114646284B (en) * | 2022-03-16 | 2023-08-11 | 重庆邮电大学 | Temperature compensation method for geometric parameters of precise gear |
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