CN111841680B - Thermostatic bath and control method thereof - Google Patents
Thermostatic bath and control method thereof Download PDFInfo
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- CN111841680B CN111841680B CN202010625281.5A CN202010625281A CN111841680B CN 111841680 B CN111841680 B CN 111841680B CN 202010625281 A CN202010625281 A CN 202010625281A CN 111841680 B CN111841680 B CN 111841680B
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- B01L7/00—Heating or cooling apparatus; Heat insulating devices
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Abstract
The invention discloses a thermostatic bath and a control method thereof, belongs to the technical field of liquid thermostatic baths, and particularly relates to the technical field of temperature control of liquid thermostatic baths, which aims to solve the problems that when the thermostatic bath works circularly between different temperature points, the temperature needs to be increased and decreased frequently, the waiting time is long, and the energy consumption is high. Through the arrangement of the heating cavity, the refrigerating cavity, the first bidirectional pump and the second bidirectional pump on one side of the constant-temperature groove body, the medium in the constant-temperature groove body can be ensured to be uniform and constant in temperature, and meanwhile, the cold and hot medium in the constant-temperature groove body can be rapidly replaced.
Description
Technical Field
A thermostatic bath and a control method thereof belong to the technical field of liquid thermostatic baths, and particularly relate to the technical field of temperature control of liquid thermostatic baths.
Background
The liquid thermostatic bath is the most common thermostatic source in the field of temperature measurement, and is widely used for the calibration and test of temperature sensitive elements such as various temperature sensors, temperature transmitters, temperature switches and the like. When the temperature control device works, the heating or refrigerating capacity is controlled through the special temperature controller, so that the temperature of the working medium in the temperature control device is kept constant, and a necessary constant temperature environment is provided for temperature calibration work. The fluctuation range of the liquid constant temperature bath is about 0.1 ℃/10 min.
The thermostatic bath is one of common equipment in a calibration laboratory, can keep constant temperature, and mainly controls the heat balance of the thermostatic bath by a thermostatic controller, when the working medium is reduced due to the external heat dissipation of the thermostatic bath, the thermostatic controller drives a heater in the thermostatic bath body to work, when the working medium is heated to a required temperature, the heater stops heating, so that the thermostatic bath keeps constant, and in addition, a plurality of thermostatic baths are provided with refrigeration compressors, refrigerate and regulate the temperature by adjusting the heating power.
The thermostatic bath device is various, but most of the thermostatic bath devices comprise a temperature sensing element, a control element, a heating element and a refrigerating element, wherein the temperature sensing element converts the temperature into a measurable electric signal and transmits the measurable electric signal to the control element, and the control element sends out an instruction to enable the heating element and the refrigerating element to work or stop.
The application number is CN201410619717.4, the patent name is a high-capacity high-precision liquid thermostatic bath, which comprises a thermostatic bath body, a top cover, a stirrer, a metal partition plate with a hole, a heater and an observation window; a top cover is arranged on the thermostatic bath body, and the stirrer, the metal partition plate with the hole, the heater and the liquid are all arranged in an inner cavity formed by the thermostatic bath body; a heat insulation material is arranged outside the constant temperature groove body; the inner wall of the top cover is provided with a heat insulation material; the top cover is provided with a plurality of holes, the stirrer is provided with three layers of stirring blades, and the stirring blades are inserted into the liquid in the constant-temperature bath body; the heater is inserted into the liquid in the thermostatic bath body; the metal partition plate with the hole divides the thermostatic bath body into a working area and a temperature control area, and the stirrer and the heater are both arranged in the temperature control area.
The high-precision liquid thermostatic bath with the large-capacity observation window is realized, and the requirements of a constant temperature environment on working volume, temperature range, temperature control precision and observability are met. However, in actual work, the medium in the thermostatic bath needs to work circularly between high temperature and low temperature, so frequent heating and/or cooling is needed, the process is long in time consumption, the intermediate waiting time is long, the working efficiency is low, and a large amount of energy is wasted in the heating and cooling process.
Disclosure of Invention
The invention aims to: the constant temperature bath and the control method thereof are provided to solve the problems that the constant temperature bath needs frequent temperature rise and fall, the waiting time is long and the energy consumption is high when the constant temperature bath circularly works between different temperature points.
The technical scheme adopted by the invention is as follows:
the utility model provides a constant temperature tank, includes the constant temperature cell body, still include with the heating chamber and the refrigeration chamber of constant temperature cell body intercommunication, the heating chamber leads to or derives the high temperature working medium of circulation flow in to the constant temperature cell body through the combination of two-way pump of second or two at least one-way pumps, the refrigeration chamber leads to or derives the low temperature working medium of circulation flow in to the constant temperature cell body through the combination of first two-way pump or two at least one-way pumps.
The working process comprises the following steps: when high and low temperature is changed, the second bidirectional pump is turned on, high-temperature working medium in the working cavity is conveyed into the heating cavity, then the second bidirectional pump is turned off, the first bidirectional pump is turned on, low-temperature working medium in the refrigerating cavity is conveyed into the working cavity, low-temperature working medium flowing out of an overflow port in the working cavity enters the refrigerating cavity through a second pipeline, and the low-temperature working medium in the working cavity is kept constant at low temperature through sequential circulation; during low-high temperature conversion, low-temperature working medium in the working cavity is conveyed to the refrigerating cavity through the first bidirectional pump, then the first bidirectional pump is closed, the second bidirectional pump is opened, high-temperature working medium preheated in the heating cavity is conveyed to the working cavity, and the high-temperature working medium in the working cavity is kept at a constant temperature through the first temperature control sensor and the first electric heater in the working cavity. Through the arrangement of the heating cavity, the refrigerating cavity and the first two-way pump or the combination of at least two one-way pumps on one side of the constant-temperature groove body and the arrangement of the combination of the second two-way pump or the combination of at least two one-way pumps, the medium in the constant-temperature groove body can be ensured to be uniform and constant in temperature, and meanwhile, the cold and hot medium in the constant-temperature groove body can be rapidly replaced.
The constant temperature bath also comprises a controller, and the controller is electrically connected with the first bidirectional pump, the second bidirectional pump, the stirrer, the first heater, the second heater, the third heater, the first temperature control sensor, the second temperature control sensor, the third temperature control sensor and the circulating liquid pump.
Preferably, a third heater and a third temperature control sensor are arranged in the heating cavity. The high-temperature working medium in the heating cavity is preheated and the temperature is controlled in advance.
Preferably, a second heater, a refrigeration evaporator and a second temperature control sensor are arranged in the refrigeration cavity. The second heater is used for heating the low-temperature working medium, the refrigeration evaporator is used for cooling the low-temperature working medium, and the second temperature control sensor is mainly used for testing the temperature rising and cooling speed and the temperature of the low-temperature working medium.
Preferably, a circulating liquid pump is further arranged in the refrigerating cavity, and the circulating liquid pump enables the low-temperature working medium to circularly flow in the refrigerating cavity. The circulating liquid pump enables the low-temperature working medium to continuously flow in the refrigerating cavity, and the temperature uniformity difference caused by local over-viscosity of the medium at low temperature is prevented.
Preferably, a tank cover is arranged at the top of the constant temperature tank body, a partition plate is vertically arranged in the constant temperature tank body, the partition plate divides the inside of the constant temperature tank body into a working chamber at one side and a stirring chamber at the other side, the partition plate divides the working chamber and the stirring chamber into a communicating vessel with the upper part and the lower part communicated with each other, and a first electric heater, a first temperature control sensor and a stirrer are arranged in the stirring chamber; the working cavity is internally provided with a first pipeline which is respectively communicated with the heating cavity and the refrigerating cavity. The clapboard is used for separating the working cavity and the stirring cavity into a communicating vessel with the upper part communicated with the lower part, so as to be beneficial to the forced circulation of the medium in the thermostatic bath body; the agitator includes driving motor, puddler and stirring leaf, and the puddler upper end is connected with driving motor, and the effect of agitator is to force the medium rapid mixing in the constant temperature tank body, "cold volume" that the low temperature working medium that provides in the heat that provides first electric heater and the refrigeration intracavity provided rapidly, evenly distributed to the medium in whole constant temperature tank body, guarantees the even temperature field of working chamber in the constant temperature tank body.
More preferably, the outside of the constant temperature groove body is wrapped with a heat preservation and insulation layer which plays a role in heat preservation and insulation.
Preferably, an overflow port is arranged on the working cavity and communicated with the refrigeration cavity through a second pipeline. The overflow port is communicated with the refrigeration cavity through a second pipeline, the medium in the thermostatic bath body expands in the temperature rising process, and part of the medium higher than the overflow port flows out through the overflow port and enters the refrigeration cavity.
Preferably, the bottom of the working cavity is communicated with a third pipeline, and a valve is arranged on the third pipeline. When the medium in the thermostatic bath body needs to be replaced, the valve is opened, and the medium flows into the external liquid storage container through the third pipeline.
A control method of a thermostatic bath comprises the following steps,
under the high-temperature working condition, the working medium in the working cavity is directly heated, or the heating cavity is preheated, then the heated working medium is conveyed into the working cavity, and the high-temperature constant-temperature control is carried out;
under the low-temperature working condition, the refrigeration cavity is pre-cooled, then the cooled working medium is conveyed into the working cavity, and the low temperature and the constant temperature are controlled;
under the working condition of low temperature and high temperature, the high temperature working medium in the working cavity is conveyed into the heating cavity, the low temperature working medium in the refrigerating cavity is conveyed into the working cavity, and low temperature and constant temperature control is carried out;
and under the working condition of changing low temperature into high temperature, conveying the low-temperature working medium in the working cavity into the refrigerating cavity, conveying the high-temperature working medium in the heating cavity into the working cavity, and performing high-temperature constant temperature control.
Preferably, a second bidirectional pump or a combination of at least two unidirectional pumps is used when the working chamber and the heating chamber mutually convey high-temperature working media; when the working chamber and the refrigeration chamber mutually convey low-temperature working media, a first bidirectional pump or a combination of at least two unidirectional pumps is used.
Preferably, the high-temperature constant-temperature control is to keep the high-temperature working medium in the working cavity at a constant temperature through a first temperature control sensor and a first electric heater in the working cavity; the low-temperature constant-temperature control specifically comprises the steps that a low-temperature working medium in the refrigerating cavity is conveyed to the working cavity, the low-temperature working medium flowing out of an overflow port in the working cavity enters the refrigerating cavity through a second pipeline, the low-temperature working medium circulates in sequence, and the low-temperature working medium in the working cavity keeps constant temperature by combining a first temperature control sensor and a first electric heater in the working cavity.
Preferably, the working medium comprises silicone oil, soft water, antifreeze, low-temperature heat transfer oil or absolute ethyl alcohol/soft water.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, through the arrangement of the heating cavity, the refrigeration cavity and the first bidirectional pump or the combination of at least two unidirectional pumps and the arrangement of the second bidirectional pump or the combination of at least two unidirectional pumps on one side of the constant-temperature groove body, the medium in the constant-temperature groove body can be ensured to be uniform and constant in temperature, and meanwhile, the cold and hot media in the constant-temperature groove body can be rapidly replaced, the middle waiting time is short, the efficiency of testing aiming at different temperatures is high, the working efficiency is high, and the energy consumption is low;
2. the circulating liquid pump enables the low-temperature working medium to continuously flow in the refrigerating cavity to prevent freezing and solidification;
3. the clapboard is used for separating the working cavity and the stirring cavity into a communicating vessel with the upper part communicated with the lower part, so as to be beneficial to the forced circulation of the medium in the thermostatic bath body;
4. the stirrer comprises a driving motor, a stirring rod and a stirring blade, the upper end of the stirring rod is connected with the driving motor, the stirrer is used for forcing the medium in the thermostatic bath body to be rapidly stirred, the heat provided by the first electric heater and the cold provided by the low-temperature working medium provided in the refrigerating cavity are rapidly and uniformly distributed in the medium in the whole thermostatic bath body, and the uniform temperature field of the working cavity in the thermostatic bath body is ensured;
5. the outside of the constant temperature groove body is also wrapped with a heat preservation and insulation layer which plays the roles of heat preservation and heat insulation;
6. the overflow port is communicated with the refrigeration cavity through a second pipeline, the medium in the thermostatic bath body expands in the temperature rise process, and part of the medium higher than the overflow port flows out through the overflow port and enters the refrigeration cavity;
7. when the medium in the thermostatic bath body needs to be replaced, the valve is opened, and the medium flows into the external liquid storage container through the third pipeline;
8. the arrangement of a plurality of shelves has increased the route that the medium flows, makes its abundant mixing, and the temperature is more even.
Drawings
FIG. 1 is a schematic structural view of a thermostatic bath according to the present invention;
FIG. 2 is a schematic structural diagram of a thermostatic bath body, a bath cover and a partition plate.
The labels in the figure are: 1-a constant temperature groove body, 2-an overflow port, 3-a working cavity, 4-a first pipeline, 5-a stirrer, 6-a stirring cavity, 7-a second bidirectional pump, 8-a heating cavity, 9-a third heater, 10-a third temperature control sensor, 11-a first bidirectional pump, 12-a second temperature control sensor, 13-a circulating liquid pump, 14-a refrigerating cavity, 15-a refrigerating evaporator, 16-a second heater, 17-a third pipeline, 18-a valve, 19-a first temperature control sensor, 21-a first electric heater, 22-a second pipeline, 23-a partition plate, 24-a heat preservation and insulation layer and 25-a groove cover.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
As shown in fig. 1, a thermostatic bath comprises a thermostatic bath body 1, and further comprises a heating chamber 8 and a refrigerating chamber 14 which are communicated with the thermostatic bath body 1, wherein the heating chamber 8 introduces or derives a high-temperature working medium which circularly flows into or out of the thermostatic bath body 1 through a combination of a second bidirectional pump 7 or at least two unidirectional pumps, and the refrigerating chamber 14 introduces or derives a low-temperature working medium which circularly flows into or out of the thermostatic bath body 1 through a combination of a first bidirectional pump 11 or at least two unidirectional pumps.
The working process is as follows: during high-temperature and low-temperature conversion, the second bidirectional pump 7 is opened, high-temperature working media in the working cavity 3 are conveyed into the heating cavity 8, then the second bidirectional pump 7 is closed, the first bidirectional pump 11 is opened, low-temperature working media in the refrigerating cavity 14 are conveyed into the working cavity 3, low-temperature working media flowing out of the overflow port 2 in the working cavity 3 enter the refrigerating cavity 14 through the second pipeline 22, and the low-temperature working media circulate in sequence to keep the low-temperature working media in the working cavity 3 constant; during low-temperature and high-temperature conversion, low-temperature working media in the working cavity 3 are conveyed to the refrigerating cavity 14 through the first bidirectional pump 11, then the first bidirectional pump 11 is closed, the second bidirectional pump 7 is opened, the preheated high-temperature working media in the heating cavity 8 are conveyed to the working cavity 3, and the high-temperature working media in the working cavity 3 are kept at a constant temperature through the first temperature control sensor 19 and the first electric heater 21 in the working cavity 3. Through the arrangement of the heating cavity 8, the refrigerating cavity 14, the first two-way pump 11 or the combination of at least two one-way pumps and the second two-way pump 7 or the combination of at least two one-way pumps on one side of the constant temperature groove body 1, the medium in the constant temperature groove body 1 can be ensured to be uniform and constant in temperature, meanwhile, the cold and hot medium in the constant temperature groove body 1 can be rapidly replaced, the middle waiting time is short, the efficiency of testing different temperatures is high, the working efficiency is high, and the energy consumption is low.
The thermostatic bath also comprises a controller which is electrically connected with the first bidirectional pump 11, the second bidirectional pump 7, the stirrer 5, the first heater, the second heater 16, the third heater 9, the first temperature control sensor 19, the second temperature control sensor 12, the third temperature control sensor 10 and the circulating liquid pump 13.
Example 2
As shown in fig. 1, in the embodiment 1, a third heater 9 and a third temperature control sensor 10 are provided in the heating chamber 8. The high-temperature working medium in the heating cavity 8 is preheated and the temperature is controlled in advance.
Example 3
Referring to fig. 1, on the basis of embodiment 1, a second heater 16, a refrigeration evaporator 15 and a second temperature-controlled sensor 12 are arranged in the refrigeration cavity 14. The second heater 16 is used for heating the low-temperature working medium, the refrigeration evaporator 15 is used for cooling the low-temperature working medium, and the second temperature control sensor 12 is mainly used for testing the temperature rising and reducing speed and the temperature of the low-temperature working medium.
Example 4
As shown in fig. 1, on the basis of embodiment 1, a circulating liquid pump 13 is further disposed in the refrigeration cavity 14, and the circulating liquid pump 13 circulates the low-temperature working medium in the refrigeration cavity 14. The circulating liquid pump 13 makes the low-temperature working medium continuously flow in the refrigerating chamber 14, and prevents the poor temperature uniformity caused by the local over-viscosity of the medium at low temperature.
Example 5
As shown in fig. 1-2, on the basis of embodiment 1, a tank cover 25 is disposed at the top of the thermostatic tank 1, a partition plate 23 is vertically disposed in the thermostatic tank 1, the partition plate 23 divides the interior of the thermostatic tank 1 into a working chamber 3 at one side and a stirring chamber 6 at the other side, the partition plate 23 divides the working chamber 3 and the stirring chamber 6 into communicating vessels with each other at upper and lower portions, and a first electric heater 21, a first temperature control sensor 19 and a stirrer 5 are disposed in the stirring chamber 6; a first pipeline 4 communicated with the heating cavity 8 and the refrigeration cavity 14 is arranged in the working cavity 3. The clapboard 23 is used for separating the working cavity 3 and the stirring cavity 6 into communicating vessels with the upper part and the lower part communicated with each other, so as to be beneficial to the forced circulation of the medium in the constant temperature tank body 1; the stirrer 5 comprises a driving motor, a stirring rod and a stirring blade, the upper end of the stirring rod is connected with the driving motor, the stirrer 5 is used for forcing the medium in the thermostatic bath body 1 to be rapidly stirred, the heat quantity provided by the first electric heater 21 and the cold quantity provided by the low-temperature working medium provided in the refrigeration cavity 14 are rapidly and uniformly distributed in the medium in the whole thermostatic bath body, and the uniform temperature field of the working cavity 3 in the thermostatic bath body 1 is ensured.
Example 6
As shown in fig. 2, on the basis of embodiment 1, the exterior of the thermostatic bath body 1 is further wrapped with a heat insulation layer 24 for heat preservation and heat insulation.
Example 7
As shown in fig. 1, on the basis of embodiment 1, an overflow port 2 is provided on the working chamber 3, and the overflow port 2 is communicated with the refrigeration chamber 14 through a second pipeline 22. The overflow port 2 is communicated with the refrigeration cavity 14 through a second pipeline 22, the medium in the constant temperature groove body 1 expands in the temperature rising process, and part of the medium higher than the overflow port 2 flows out through the overflow port 2 and enters the refrigeration cavity.
Example 8
As shown in fig. 1, in addition to embodiment 1, a third pipeline 17 is communicated with the bottom of the working chamber 3, and a valve 18 is arranged on the third pipeline 17. When the medium in the thermostatic bath body 1 needs to be replaced, the valve 18 is opened, and the medium flows into the external liquid storage container through the third pipeline 17.
Example 9
A control method of a thermostatic bath comprises the following steps,
under the high-temperature working condition, the working medium in the working cavity 3 is directly heated, or the heating cavity 8 is preheated, then the heated working medium is conveyed into the working cavity 3, and the high-temperature constant-temperature control is carried out;
under the low-temperature working condition, the refrigeration cavity 14 is pre-cooled, then the cooled working medium is conveyed into the working cavity 3, and the low temperature and the constant temperature are controlled;
under the working condition of low temperature and high temperature, the high temperature working medium in the working cavity 3 is conveyed into the heating cavity 8, the low temperature working medium in the refrigeration cavity 14 is conveyed into the working cavity 3, and low temperature and constant temperature control is carried out;
under the working condition of low temperature and high temperature, the low-temperature working medium in the working cavity 3 is conveyed into the refrigerating cavity 14, the high-temperature working medium in the heating cavity 8 is conveyed into the working cavity 3, and high-temperature constant temperature control is carried out;
when the working chamber 3 and the heating chamber 8 mutually convey high-temperature working media, a second bidirectional pump 7 or a combination of at least two unidirectional pumps is used; when the working chamber 3 and the refrigeration chamber 14 mutually convey low-temperature working media, a first bidirectional pump 11 or a combination of at least two unidirectional pumps is used:
the high-temperature constant-temperature control is to keep the high-temperature working medium in the working cavity 3 at a constant temperature through a first temperature control sensor 19 and a first electric heater 21 in the working cavity 3; the low-temperature constant-temperature control is specifically that low-temperature working media in the refrigerating cavity 14 are conveyed to the working cavity 3, the low-temperature working media flowing out of the overflow port 2 in the working cavity 3 enter the refrigerating cavity 14 through the second pipeline 22, the low-temperature working media circulate in sequence, and the low-temperature working media in the working cavity 3 are kept at a constant temperature by combining the first temperature control sensor 19 and the first electric heater 21 in the working cavity 3.
The working medium comprises silicone oil, soft water, antifreeze, low-temperature heat conduction oil or absolute ethyl alcohol/soft water.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A thermostatic bath comprises a thermostatic bath body (1), and is characterized in that: the constant-temperature trough body is characterized by further comprising a heating cavity (8) and a refrigerating cavity (14) which are communicated with the constant-temperature trough body (1), wherein the heating cavity (8) leads in or leads out a high-temperature working medium which flows in a circulating mode into or out of the constant-temperature trough body (1) through a second bidirectional pump (7) or a combination of at least two unidirectional pumps, and the refrigerating cavity (14) leads in or leads out a low-temperature working medium which flows in a circulating mode into or out of the constant-temperature trough body (1) through a first bidirectional pump (11) or a combination of at least two unidirectional pumps; the control method of the thermostatic bath comprises the following steps,
under the high-temperature working condition, the working medium in the working cavity (3) is directly heated, or the heating cavity (8) is preheated, and then the heated working medium is conveyed into the working cavity (3) and is subjected to high-temperature constant-temperature control;
under the low-temperature working condition, the refrigeration cavity (14) is cooled in advance, and then cooled working media are conveyed into the working cavity (3) for low-temperature constant-temperature control;
under the working condition of low temperature and high temperature, the high-temperature working medium in the working cavity (3) is conveyed into the heating cavity (8), the low-temperature working medium in the refrigerating cavity (14) is conveyed into the working cavity (3), and low-temperature constant-temperature control is performed;
and under the working conditions of low temperature and high temperature, the low-temperature working medium in the working cavity (3) is conveyed into the refrigerating cavity (14), the high-temperature working medium in the heating cavity (8) is conveyed into the working cavity (3), and high-temperature constant temperature control is performed.
2. A thermostatic bath according to claim 1, characterized in that: and a third heater (9) and a third temperature control sensor (10) are arranged in the heating cavity (8).
3. A thermostatic bath according to claim 1, characterized in that: and a second heater (16), a refrigeration evaporator (15) and a second temperature control sensor (12) are arranged in the refrigeration cavity (14).
4. A thermostatic bath according to claim 3, characterized in that: and a circulating liquid pump (13) is further arranged in the refrigeration cavity (14), and the circulating liquid pump (13) enables the low-temperature working medium to circularly flow in the refrigeration cavity (14).
5. A thermostatic bath according to claim 1, characterized in that: a tank cover (25) is arranged at the top of the constant-temperature tank body (1), a partition plate (23) is vertically arranged in the constant-temperature tank body (1), the partition plate (23) divides the interior of the constant-temperature tank body (1) into a working chamber (3) at one side and a stirring chamber (6) at the other side, the partition plate (23) divides the working chamber (3) and the stirring chamber (6) into communicating devices with the upper part and the lower part communicated with each other, and a first electric heater (21), a first temperature control sensor (19) and a stirrer (5) are arranged in the stirring chamber (6); and a first pipeline (4) which is respectively communicated with the heating cavity (8) and the refrigeration cavity (14) is arranged in the working cavity (3).
6. A thermostatic bath according to claim 5, characterized in that: an overflow port (2) is arranged on the working cavity (3), and the overflow port (2) is communicated with the refrigeration cavity (14) through a second pipeline (22).
7. A thermostatic bath according to claim 5, characterized in that: the bottom of the working cavity (3) is communicated with a third pipeline (17), and a valve (18) is arranged on the third pipeline (17).
8. A thermostatic bath according to claim 6, characterized in that the working chamber (3) and the heating chamber (8) are fed with the hot working medium from each other by means of a second bidirectional pump (7) or a combination of at least two unidirectional pumps; when the working chamber (3) and the refrigeration chamber (14) mutually convey low-temperature working media, a first bidirectional pump (11) or a combination of at least two unidirectional pumps is used.
9. A thermostatic bath according to claim 8, characterized in that the high temperature thermostatic control consists in keeping the high temperature working medium of the working chamber (3) at a constant temperature by means of a first temperature control sensor (19) and a first electric heater (21) inside the working chamber (3); the low-temperature constant-temperature control specifically comprises the steps that low-temperature working media in the refrigerating cavity (14) are conveyed to the working cavity (3), the low-temperature working media flowing out of an overflow port (2) in the working cavity (3) enter the refrigerating cavity (14) through a second pipeline (22), circulation is conducted in sequence, and meanwhile the low-temperature working media in the working cavity (3) are kept constant in temperature by combining a first temperature control sensor (19) and a first electric heater (21) in the working cavity (3).
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