CN112120564A - Constant temperature bathtub with temperature controlled by ambient temperature and temperature control method - Google Patents
Constant temperature bathtub with temperature controlled by ambient temperature and temperature control method Download PDFInfo
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- CN112120564A CN112120564A CN202010981879.8A CN202010981879A CN112120564A CN 112120564 A CN112120564 A CN 112120564A CN 202010981879 A CN202010981879 A CN 202010981879A CN 112120564 A CN112120564 A CN 112120564A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 71
- 238000012360 testing method Methods 0.000 claims description 36
- 230000001105 regulatory effect Effects 0.000 claims description 15
- 230000007613 environmental effect Effects 0.000 claims description 10
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims 1
- 238000009434 installation Methods 0.000 claims 1
- 238000003287 bathing Methods 0.000 abstract description 8
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 7
- 239000003365 glass fiber Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 239000005457 ice water Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
- A47K3/00—Baths; Douches; Appurtenances therefor
- A47K3/02—Baths
- A47K3/022—Baths specially adapted for particular use, e.g. for washing the feet, for bathing in sitting position
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
- A47K3/00—Baths; Douches; Appurtenances therefor
- A47K3/001—Accessories for baths, not provided for in other subgroups of group A47K3/00 ; Insertions, e.g. for babies; Tubs suspended or inserted in baths; Security or alarm devices; Protecting linings or coverings; Devices for cleaning or disinfecting baths; Bath insulation
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Abstract
The invention discloses an external heating type constant temperature bathtub and a temperature control method, wherein the bathtub is enjoyed, more and more people experience bathtub bathing along with the development of the society, the temperature of bathing water can be reduced after the bathing time is long, usually, some water is discharged and then hot water is supplemented, the water is discharged, not only water sources but also heat sources are wasted, the discharged water also contains a lot of heat, therefore, a constant temperature bathtub invented by a bathtub factory for obtaining the machine of the business can be kept constant no matter how long the bathing is, various constant temperature bathtub patents are applied by the bathtub factory, but only water circulation constant temperature bathtubs are really marketed. The invention discloses a water-circulated thermostatic bathtub, which has potential safety hazards, wherein electric appliances such as a water pump, an electric heater, an electromagnetic valve and the like are used, the electric appliances are 220V alternating current electric appliances at present, the lives of people can be threatened by electric leakage in case of damage of the electric appliances, although a protection circuit is arranged, the life safety of people cannot be guaranteed in case of damage of the protection circuit, so that a plurality of people want to heat outside the bathtub to solve the problems, and the temperature can be controlled difficultly.
Description
Technical Field
The invention relates to the field of bathtubs, in particular to a constant-temperature bathtub with temperature controlled by ambient temperature and a temperature control method.
Background
The bathtub is a high-price enjoyment, more and more people experience the high-price enjoyment along with the development of the society, the temperature of bath water can be reduced after the bath water is used for bathing for a long time, usually, some water is discharged and then hot water is supplemented, the discharged water is discharged, not only water sources but also heat sources are wasted, the discharged water also contains a lot of heat, therefore, a bathtub factory develops the constant-temperature bathtub for obtaining the commercial machine, the water temperature can be kept unchanged no matter how long the bathtub is soaked, various constant-temperature bathtub patents are applied to the bathtub of the factory, but the market is really just the water circulation constant-temperature bathtub.
The water circulation has two defects to influence the market, one is that the comfort is poor, the temperature of a human body sensitive to bath water is basically between 38 ℃ and 42 ℃, the temperature is lower in summer and higher in winter, hot water entering the water circulation constant-temperature bathtub is usually higher than the bath water by about 2 ℃, so that the human body feels obvious uncomfortable, particularly, when the bath temperature is 42 ℃, the entering water has about 44 ℃ and has a hot feeling, and then, a water-free area of the bathtub is not heated, and the bathtub wall of the water-free area contacted by the human body feels icy and cool during the bath; the other is a safety problem, water circulation needs to use electrical appliances such as a water pump, an electric heater, an electromagnetic valve and the like, most of the electrical appliances are in contact with water and are all alternating current of 220V at present, the electrical appliances threaten the life of a person in case of electric leakage in case of damage, and although a protection circuit is arranged, the life safety of the person cannot be guaranteed in case of damage of the protection circuit.
Aiming at the problems, people want to adopt a method of heating the outer wall of the bathtub to keep the temperature constant, so that the two problems are solved, and the problem that the temperature heated outside the bathtub is difficult to control can be found through repeated tests, so that the inventor applies a patent of 'a heating method of an external heating type constant temperature bathtub' in the front period of the company, the application number is '202010770082.3', the patent solves the problem that the temperature of the external heating type constant temperature bathtub cannot be controlled, but the compensation method adopts fuzzy temperature control by adopting a compensation method, the compensation temperature needs to be set manually, the compensation temperature is estimated, the set good deviation is small, the set bad deviation is large, and the temperature of a heating sheet controlled by the heating device is large in fluctuation and the bathtub is easy to damage.
External heating type constant temperature control is difficult: according to the conventional temperature control method, the temperature of bath water is constant, a temperature sensor is arranged in the water to sense the water temperature, so as to control the water temperature, but the bathtub is very special, the water temperature is not heated by a temperature control circuit, but the water temperature is heated to the required temperature by the outside, so that if an intelligent temperature controller with a PID function is adopted to control the temperature, the water temperature added into the bathtub is basically the same as the set temperature of the temperature controller, therefore, the intelligent temperature controller cannot calculate the constant temperature by actually supplementing the heating quantity, the heating quantity to be supplemented can be calculated only after a period of time, but the water in a large bathtub has slow specific heat and large temperature change, can calculate the quantity of heat to be supplemented only after a long period of time, and the bath water temperature is not stable, therefore, the requirement on the bathtub is fast and stable, the temperature control can not be stable after the completion of people, therefore, the temperature control result of the intelligent temperature controller is basically much lower. The switch type temperature controller is switched off when the set temperature is reached, the temperature control result of the switch type temperature controller is that the switch type temperature controller is heated to over-temperature protection for a long time or is not heated for a long time, because the sensitivity of the switch type temperature controller is very low, the temperature controller can switch off a heating circuit after the temperature reaches the set value, the switch type temperature controller is switched on for heating when the sensitivity is at least 1 ℃ lower, and the switch type temperature controller is mostly switched on for heating at 2 ℃ or even 5 ℃. The bath of human body is very sensitive to water temperature, although some people can bath in hot water at about 45 ℃ and can also bath in ice water at 0 ℃, the bath is only borne, the enjoyable temperature range is very uncomfortable after changing by 1 ℃, the change by 2 ℃ is very difficult, the common bath temperature is 38-42 ℃, for example, the bath with the water temperature of 38 ℃ in summer feels cold after the temperature is reduced by 2 ℃ to 36 ℃, the temperature is lower than the temperature of the human body, the cold feeling is realized when the temperature is reduced from 42 ℃ to 40 ℃ in winter, although the water temperature of 40 ℃ is very high, the human body has good memory, the feeling that the human body starts to contact with 42 ℃ is much lower than before, and the feeling that the human body experiences the temperature is reduced from 42 ℃ to 40 ℃ is greatly different from the feeling that when the temperature is reduced to 40 ℃, so that the human body experiences the water temperature which is reduced from 42 ℃ to 40 ℃ and directly contacts with 40 ℃ is greatly different. When a bathtub without a constant temperature device has a bath time of about ten minutes, the user feels cold after the temperature is usually reduced by a few degrees, so that the constant temperature bath has the significance of keeping the temperature fluctuation not more than 0.5 ℃ for a long time and does not lose the comfortable feeling.
Disclosure of Invention
Aiming at the problems, repeated tests and careful analysis are carried out, and the fact that the water temperature change in the bathtub only has three items of cylinder body structure, working temperature (water temperature) and ambient temperature is found, the cylinder body structure is fixed, the bathtub of the same type is the same, the water temperature for bathing is basically in a 38-42 ℃ range, the influence is small, the two items can be measured to find out the compensation value of the three items, only one variable is the ambient temperature, and therefore the constant-temperature bathtub only controlling and compensating the heat loss through the ambient temperature is invented, does not need any setting, and achieves the constant temperature purpose by automatically compensating according to the ambient temperature.
Specifically, the method comprises the following steps: the temperature control device comprises a temperature sensor, a voltage-regulating type switching power supply, a heating sheet and a bathtub, wherein the heating sheet is arranged on the outer wall of the bathtub, the voltage-regulating type switching power supply supplies power to the heating sheet, a reference voltage circuit in the voltage-regulating type switching power supply is provided with the temperature sensor, the resistance value of the temperature sensor can be changed by the change of the environmental temperature, so that the reference voltage is changed, the output voltage of the voltage-regulating type switching power supply is correspondingly changed, the temperature control method for automatically regulating the output voltage of the voltage-regulating type switching power supply by the environmental temperature is realized, and the temperature of the bathing.
The reference voltage circuit in the voltage-regulating switch power supply is a triode amplifying circuit, a temperature sensor and a base bias resistor R1 are used for base bias of a triode, a resistor R2 is used for collector resistance of the triode, reference voltage is output to a comparison circuit in the voltage-regulating switch power supply at a collector of the triode, and the comparison circuit controls pulse width output after comparison, so that the output voltage of the voltage-regulating switch power supply is controlled, and the reference voltage is changed along with the change of the ambient temperature to change the output voltage of the voltage-regulating switch power supply.
The temperature control method of the constant temperature bathtub controlled by the ambient temperature comprises the following steps:
s1, testing different types of bathtubs by using a power supply test board and a test heating sheet, wherein the power supply test board is modified by a voltage-regulating type switching power supply, R1 and R2 in a reference voltage circuit in the voltage-regulating type switching power supply are respectively replaced by adjustable resistors W1 and W2, and the resistance value of the test heating sheet is manufactured according to a predicted value;
s2, testing different types of bathtubs by using the power test board and the test heating sheet, and measuring the ambient temperature of about 10 ℃ and the water temperature of 42 ℃ to determine the power of the heating sheetThe water temperature is not changed after 4 hours, the power value is taken as the design standard, and then R is equal to U2Obtaining the resistance value of the heating sheet according to the voltage/W, wherein the voltage U is preferably selected but not limited to 24V direct current;
s3, adhering the heating sheet manufactured according to the resistance measured in S2 on the outer surface of the bathtub, connecting the heating sheet to the output end of the voltage-regulating type switching power supply, and regulating W1 to enable the voltage of the output end of the voltage-regulating type switching power supply to be equal to the voltage set in S2 under the same environment temperature and water temperature conditions as S2;
s4, adjusting the water temperature to 38 ℃, and adjusting W2 to keep the voltage output by the voltage-adjustable switch power supply unchanged for about 4 hours at the ambient temperature of about 30 ℃;
s5, the resistance values of W1 and W2 measured by the power supply test board are used as the resistance values of fixed resistors R1 and R2, the resistance values are installed in a reference voltage circuit in a voltage-regulating type switching power supply which is actually used, bathtubs of the same type can be directly produced in batch by using the same voltage-regulating type switching power supply assembled by R1 and R2, and the resistance values of R1 and R2 of different types are measured by using the same method.
It should be noted that the voltage U in S2 is preferably 24V dc from the safety aspect, and it is not limited to 24V but 36V dc or less, although the external heating type constant temperature bathtub does not have any electric appliance to contact with water, but it is also prevented that water may be immersed into the heat generating sheet in case of breakage of the bathtub, the safety voltage is 36V ac or less, the dc is safer to electric shock, so 24V dc is preferred, the voltage is high and the safety is poor, but the cost is increased because the voltage is too low and the current is large.
In S2, the power of the heat generating sheet is measured at an ambient temperature of about 10 ℃, which is to determine the highest operating voltage, and it is not required to measure the highest operating voltage, but the lower the measured temperature is, the closer the future highest operating voltage is to the set value, the lower the ambient temperature of 10 ℃ in practical application is; the test water temperature is set according to the low water temperature and the high water temperature of the environment temperature, the compensation is more accurate, the water temperature for bathing is usually between 38 ℃ and 42 ℃, the influence of the range is small, and the test of the low-temperature environment of S3 according to the water temperature of 42 ℃ is the temperature commonly used in winter. In S4, the output voltage of the voltage-regulating switch power supply is tested and regulated by the environment temperature of about 30 ℃, the full-range precision of the voltage-regulating switch power supply is regulated, and the test water temperature in the high-temperature environment is lower, wherein the setting is 38 ℃.
The test purpose of S2, S3 and S4 is to measure the thermal compensation of different water temperatures and environmental temperatures of bathtubs of the same type, although only two points are tested here, other states can be controlled completely and accurately because the heat conduction from high temperature to low temperature is realized according to the heat conduction principle, the heat of the bathtub is radiated because the temperature of the periphery is lower than that of the bathtub, if the temperature of the periphery is ensured to be the same as or higher than that of the periphery, the heat is not radiated, the heat can be absorbed from the periphery, the side of the bathtub except the upper side is open, other 5 sides are the bathtub walls, heating sheets are adhered to the bathtub walls for heating, as long as the temperature of the 5 sides is higher than or equal to the water temperature, the sides can not radiate heat, only the side on the upper side radiates heat, only the heat loss of the side on the upper side needs to be supplemented, the supplement amount is small, and the temperature compensation control method can keep the temperature of the outer wall higher than the water temperature all the moment, and the temperature can be controlled according to the environment temperature, so the influence of the temperature of the working temperature (water temperature) is very high. The compensation is again made at a high point at 42 c and a low point at 38 c, with little deviation between the other points.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic structural diagram of a thermostatic bathtub controlled by ambient temperature and a temperature control method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a conventional switching power supply on the market;
FIG. 3 is a circuit diagram of a reference voltage in a voltage regulated switching power supply according to an embodiment of the present invention;
the names of the components corresponding to the reference numerals in the figure are as follows:
1. a temperature sensor; 2. a voltage-regulating switching power supply; 3. a heat generating sheet; 4. a bathtub; r1, base bias resistance; r2, collector resistance; and Q, a triode.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Referring to fig. 1, the bath cabinet is composed of a temperature sensor (1), a voltage-regulating type switching power supply (2), a heating sheet (3) and a bath tub (4), wherein the heating sheet (3) is arranged on the outer wall of the bath tub (4), the voltage-regulating type switching power supply (2) supplies power to the heating sheet (3), a reference voltage circuit in the voltage-regulating type switching power supply (2) is provided with the temperature sensor (1), the change of the environmental temperature can change the resistance value of the temperature sensor (1), so that the reference voltage is changed, the output voltage of the voltage-regulating type switching power supply (2) is correspondingly changed, and the temperature control method for automatically regulating the output voltage of the voltage-regulating type switching power supply (2) by the environmental temperature is realized to keep the bath water temperature constant.
Referring to fig. 2, fig. 2 is a schematic diagram of a conventional switching power supply on the market, which includes basic circuits of a rectifying filter circuit, a high-frequency voltage converting circuit, a width-modulated square wave rectifying filter circuit, an oscillating circuit, a pulse width modulation circuit, a reference voltage circuit, a comparison circuit and a sampling circuit. The voltage-regulating type switch power supply (2) is also a switch power supply, and is different in that the output voltage of the voltage-regulating type switch power supply is adjustable, the basic structures are the same, the only difference is that the reference voltage circuit is a reference voltage circuit, the voltage of the reference voltage circuit of the fixed voltage switch power supply is constant, and the reference voltage circuit in the voltage-regulating type switch power supply (2) is adjustable in voltage, is changed by the ambient temperature sensed by the temperature sensor (1), and is adjusted by the ambient temperature.
Specifically, the method comprises the following steps: the commercial power is rectified and filtered, then the commercial power is changed into direct current by alternating current, then the frequency generated by the oscillating circuit and the pulse width modulated by the pulse width modulation circuit restrict the current entering the high-frequency voltage conversion circuit, the rectified direct current enters the high-frequency voltage conversion circuit according to the modulated frequency and pulse width, the high-frequency voltage conversion circuit is a high-frequency transformer, the direct current passes through the high-frequency voltage conversion circuit according to high-frequency pulses and then is changed into alternating current, the alternating current variable voltage can obtain the high-frequency pulse voltage transmitted at the secondary pole, the high-frequency voltage conversion circuit can output the required voltage according to the requirement, but the stability of the high-frequency voltage conversion circuit is poor and fluctuates along with the fluctuation of the load, for example, the high-frequency pulse voltage is changed into direct current after being rectified and filtered by width modulation square waves, and the direct current voltage can adjust the voltage according to the pulse width duty ratio, therefore, the invention is to change the resistance value of the temperature sensor (1) by the ambient temperature to change the reference voltage value, thereby changing the output voltage of the voltage regulating switch power supply (2) to stabilize the temperature.
Further, referring to fig. 3, the reference voltage circuit in the voltage-regulating switching power supply (2) is a triode amplifier circuit, the base bias of the triode Q is made by the temperature sensor (1) and the base bias resistor R1, the collector resistor R2 is made as the collector resistor of the triode Q, the reference voltage is output from the collector of the triode Q to the comparison circuit in the voltage-regulating switching power supply (2), the comparison circuit controls the pulse width output after comparison, thereby controlling the output voltage of the voltage-regulating switching power supply (2), and the reference voltage changes when the environmental temperature changes, so as to regulate the output voltage of the voltage-regulating switching power supply (2). The temperature sensor (1) is preferably a thermistor as the temperature sensor, the thermistor has large resistance change along with temperature change and high sensitivity although the linearity of the thermistor is poor, and the temperature control range of the constant temperature bathtub is small and the influence of the linearity error of the constant temperature bathtub is small.
The output voltage of the voltage-regulating type switching power supply (2) is controlled by adopting the change of the environmental temperature, the temperature can be controlled, but the temperature needs to be controlled accurately and the test and the debugging are needed, and the method also needs to be carried out according to the following steps:
s1, testing different types of bathtubs by using a power supply test board and a test heating sheet, wherein the power supply test board is modified by a voltage-regulating type switching power supply (2), R1 and R2 in a reference voltage circuit in the voltage-regulating type switching power supply (2) are respectively replaced by adjustable resistors W1 and W2, and the resistance value of the test heating sheet is manufactured according to a predicted value;
s2, testing different types of bathtubs with the power test board and the test heating sheet, measuring the ambient temperature of about 10 ℃ and the water temperature of 42 ℃, determining the power of the heating sheet to keep the water temperature unchanged for about 4 hours, and taking the power value as the design standard and then setting R to U2The resistance value of the heating sheet (3) is obtained by the voltage/W, the heating sheet (3) is manufactured according to the resistance value, and the voltage U is preferably selected and is not limited to 24V direct current;
s3, adhering the heating sheet (3) manufactured according to the resistance measured by the S2 on the outer surface of the bathtub (4), connecting the heating sheet (3) to the output end of the voltage-regulating type switching power supply (2), and regulating W1 to enable the voltage of the output end of the voltage-regulating type switching power supply (2) to be equal to the voltage set by the S2 under the same environmental temperature and water temperature conditions as S2;
s4, adjusting the water temperature to 38 ℃, and adjusting the resistance W2 to enable the voltage output by the voltage-adjusting type switching power supply (2) to keep the water temperature unchanged for about 4 hours at the ambient temperature of about 30 ℃;
s5, the resistance values of W1 and W2 measured by the power supply test board are used as the resistance values of fixed resistors R1 and R2, the resistance values are installed in a reference voltage circuit in a voltage-regulating type switching power supply (2) which is actually used, the same voltage-regulating type switching power supply (2) assembled by the same R1 and R2 can be directly used for bathtubs of the same type, and the resistance values of R1 and R2 can be measured by the same method for bathtubs of different types.
The steps are used for testing the resistance values of the heating sheet (3), the resistors R1 and R2 of the same type of bathtub, one type of bathtub is tested only once, and the tested values are used for production in batch production, so that each bathtub does not need to be measured and debugged. A bath has 5 sides with 5 heat generating sheets (3), only 3 sides being shown in the figure, which are preferably designed in series.
It should be noted that the reference voltage circuit in fig. 3 is for describing the constant temperature method of the present invention, and it is not limited to this circuit, and there is a suitable thermistor that can directly use the thermistor to regulate voltage, and also can use other modes such as operational amplifier, and as long as the method that uses the ambient temperature to control the output voltage is the concept of the present invention, it belongs to the temperature control method that infringes the present invention. The invention adopts a simple amplifying circuit, the reference voltage can be changed directly by the thermistor, but the variation of the amplifying circuit does not necessarily meet the full range, so that a simple triode amplifier is added, the amplifying circuit is simple, the amplifying circuit is also somewhat limited when debugging W1 and W2, the adjusting is required to be repeated, and one type of bathtub only needs one test and debugging.
The realization of the invention has a more important characteristic that determines whether the bathtub made of acrylic materials can be used as a constant temperature bathtub by adopting an external heating mode. Most of current bathtubs are formed by bonding acrylic and glass fibers by epoxy resin, acrylic is softened at 70 ℃ and is completely supported by the glass fibers and the epoxy resin, the thermal expansion coefficients of the glass fibers and the acrylic are greatly different, the expansion amount difference of the glass fibers and the acrylic is high, the acrylic and the glass fibers are easily bonded and separated to cause delamination loss, therefore, the heating temperature peak value of the bathtub is preferably not more than 46 ℃ and not more than 50 ℃, the glass fibers are thermal insulation materials, the thermal conductivity coefficient of the bathtub is very low, a large temperature difference can be formed when the outer layer glass fiber thermal insulation material is heated into a bathtub to heat water, and the larger heating amount is, the larger the temperature difference is. The peak temperature generated by the same heating mode with different heating amounts is different, the peak temperature generated by continuous heating is the lowest, the peak value of intermittent heating is high, for example, 200W of heat is uniformly and continuously heated on a surface with 1 square meter, the temperature rise of the continuous heating is 10 ℃, if the intermittent heating with the on-off rate of 50 percent is adopted, because the continuous heating is not adopted, the heating amount during heating needs to supplement the heat during non-heating, 200W/50 percent is 400W, the temperature rise of the continuous heating is improved to (400W/200W) multiplied by 10 ℃ to 20 ℃, although the heat storage property of the heating material can be heated by part of the stored heat during the interrupted heating period, the peak temperature is lower and is not lower than 15 ℃, and obviously, the peak temperature of the intermittent heating is much higher than that of the continuous heating. The present invention relates to a constant-temperature control method, and is characterized by that the constant-temperature control is implemented by adopting discontinuous heating mode, and its heating voltage is fixed, only the on-off time is controlled to accumulate required heating quantity, and the voltage is changed to control heating quantity, and the power is changed to heat, and the heating mode is continuous and continuous heating mode, and its peak value temperature is obviously lower than that of existent heating mode, and has no influence on other products, but is very important for acrylic bathtub, when the environmental temperature is 15 deg.C and water temperature is 42 deg.C, only said temperature control mode can make the peak value temperature not exceed 46 deg.C, and it also has need of using high-uniformity surface heating sheet, and its line heating sheet is not used.
Claims (3)
1. The utility model provides a constant temperature bathtub and temperature control method that come the accuse temperature by ambient temperature, a serial communication port, including temperature sensor (1), pressure regulating formula switching power supply (2), generate heat piece (3), bathtub (4), will generate heat piece (3) and install on the outer wall of bathtub (4), give the power supply of piece (3) that generates heat by pressure regulating formula switching power supply (2), reference voltage circuit installation temperature sensor (1) in pressure regulating formula switching power supply (2), the change of ambient temperature will change the resistance value of temperature sensor (1), thereby change the reference voltage and correspondingly change the output voltage of pressure regulating formula switching power supply (2), realize coming the temperature control method of the output voltage of automatically regulated pressure regulating formula switching power supply (2) by ambient temperature, invariable bath temperature.
2. The thermostatic bathtub according to claim 1, wherein the reference voltage circuit in the voltage-regulating switching power supply (2) is a triode amplifier circuit, the base bias of the triode Q is performed by the temperature sensor (1) and a base bias resistor R1, a collector resistor R2 is performed as a collector resistor of the triode Q, the reference voltage is output from the collector of the triode Q to a comparator circuit in the voltage-regulating switching power supply (2), the comparator circuit controls the pulse width output after comparison, thereby controlling the output voltage of the voltage-regulating switching power supply (2), and the reference voltage is changed when the ambient temperature changes, so as to change the output voltage of the voltage-regulating switching power supply (2).
3. The temperature control method of the constant temperature bathtub controlled by ambient temperature, which is applied to the constant temperature bathtub controlled by ambient temperature according to any one of claims 1-2, the method comprising:
s1, testing different types of bathtubs by using a power supply test board and a test heating sheet, wherein the power supply test board is modified by a voltage-regulating type switching power supply (2), R1 and R2 in a reference voltage circuit in the voltage-regulating type switching power supply (2) are respectively replaced by adjustable resistors W1 and W2, and the resistance value of the test heating sheet is manufactured according to a predicted value;
s2, testing different types of bathtubs with the power test board and the test heating sheet, measuring the ambient temperature of about 10 ℃ and the water temperature of 42 ℃, determining the power of the heating sheet to keep the water temperature unchanged for about 4 hours, and taking the power value as the design standard and then setting R to U2The resistance value of the heating sheet (3) is obtained by the voltage/W, the heating sheet (3) is manufactured according to the resistance value, and the voltage U is preferably selected and is not limited to 24V direct current;
s3, adhering the heating sheet (3) manufactured according to the resistance measured by the S2 on the outer surface of the bathtub (4), connecting the heating sheet (3) to the output end of the voltage-regulating type switching power supply (2), and regulating W1 to enable the voltage of the output end of the voltage-regulating type switching power supply (2) to be equal to the voltage set by the S2 under the same environmental temperature and water temperature conditions as S2;
s4, adjusting the water temperature to 38 ℃, and adjusting W2 to keep the voltage output by the voltage-adjusting type switching power supply (2) unchanged for about 4 hours at the ambient temperature of about 30 ℃;
s5, the resistance values of W1 and W2 measured by the power supply test board are used as the resistance values of fixed resistors R1 and R2, the resistance values are installed in a reference voltage circuit in a voltage-regulating type switching power supply (2) which is actually used, the same voltage-regulating type switching power supply (2) assembled by the same R1 and R2 can be directly used for bathtubs of the same type, and the resistance values of R1 and R2 can be measured by the same method for bathtubs of different types.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010981879.8A CN112120564A (en) | 2020-09-17 | 2020-09-17 | Constant temperature bathtub with temperature controlled by ambient temperature and temperature control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010981879.8A CN112120564A (en) | 2020-09-17 | 2020-09-17 | Constant temperature bathtub with temperature controlled by ambient temperature and temperature control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115542968A (en) * | 2022-09-29 | 2022-12-30 | 苏州纳芯微电子股份有限公司 | Control method and control device of temperature control device, temperature control device and storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115542968A (en) * | 2022-09-29 | 2022-12-30 | 苏州纳芯微电子股份有限公司 | Control method and control device of temperature control device, temperature control device and storage medium |
| CN115542968B (en) * | 2022-09-29 | 2023-10-20 | 苏州纳芯微电子股份有限公司 | Control method and control device for temperature control device, temperature control device and storage medium |
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Application publication date: 20201225 |